Title: Cam device and position adjusting device for steering wheel
Technical field

[0001]
　TECHNICAL FIELD The present invention relates to a cam device incorporated in a position adjusting device of a steering wheel of an automobile and the like and a position adjusting device for a steering wheel incorporating the cam device.
BACKGROUND ART

[0002]
　8, the rotation of the steering wheel 1 is transmitted to the input shaft 3 of the steering gear unit 2, and as the input shaft 3 rotates, the pair of right and left tie rods 4 are pushed and pulled So that a steering angle is given to the front wheels. The steering wheel 1 is supported and fixed to the rear end portion of the steering shaft 5, and the steering shaft 5 is rotatably supported by the steering column 6 in a state where the steering shaft 5 is axially inserted through the cylindrical steering column 6 . The front end portion of the steering shaft 5 is connected to the rear end portion of the intermediate shaft 8 via a universal joint 7 and the front end portion of the intermediate shaft 8 is connected to the input shaft 3 via another universal joint 9 .
[0003]
　The steering apparatus for an automobile includes a tilt mechanism for adjusting the vertical position of the steering wheel 1 and / or a telescopic mechanism for adjusting the longitudinal position of the steering wheel 1 according to the physique and driver's posture of the driver A position adjustment device of the steering wheel is incorporated (see Japanese Unexamined Patent Application Publication No. 2009-227181). In order to form a tilt mechanism, the housing 10 is fixed to the front end portion of the steering column 6, and the upper front end portion of the housing 10 is swingably displaced relative to the vehicle body 11 by the tilt shaft 12 arranged in the width direction It is possible to be supported. In this specification, the width direction means the width direction of the vehicle body and coincides with the left-right direction of the vehicle body. The displacement bracket 13 is provided on the lower surface of the intermediate portion in the axial direction of the steering column 6 and the support bracket 14 is provided in a state of sandwiching the displacement bracket 13 from both sides in the width direction. A pair of tilt elongated holes 15 extending in the vertical direction are formed in the support bracket 14, and a through hole 16 is formed in a portion of the displacement bracket 13 which is aligned with a part of the elongated hole 15 for tilt ing. In the illustrated example, in order to construct a telescopic mechanism, the through hole 16 is constituted by a long hole (long hole for telescopic) extending in the front-rear direction. In addition, the steering shaft 5 and the steering column 6 are configured to be expandable and contractible. The rod member 17 is provided in a state where the tilt elongated hole 15 and the through hole 16 are inserted in the width direction. By manipulating the adjustment lever provided at one end of the rod member 17, by adjusting the force holding the displacement bracket 13 from both sides in the width direction by the support bracket 14, it is possible to adjust the position of the steering wheel 1 Switch to the locked state.
[0004]
　9 and 10 show an example of a steering apparatus having a steering wheel position adjusting device. The steering column 6 is constructed so that the front portion of the outer column 18 disposed on the rear side and the rear portion of the inner column 19 arranged on the front side are slidably fitted to each other so that the overall length can be expanded and contracted. The outer column 18 is made by, for example, die cast molding a light alloy. By providing the slit 20 in the front portion of the outer column 18, the front portion of the outer column 18 is configured so that its inner diameter can be resiliently expanded and contracted. A pair of clamped plate portions 21 constituting the displacement bracket 13 are provided on portions of the outer peripheral surface of the outer column 18 that sandwich the slit 20 from both sides in the left and right directions. A through hole (telescopic long hole) 16 is formed in the pair of held plate portions 21. The pair of support plate portions 22 constituting the support bracket 14 are disposed so as to hold the displacement bracket 13 from both the left and right sides. In the pair of support plate portions 22, a tilt elongated hole 15 having a partial arc shape centered on the tilt shaft 12 (see FIG. 8) is formed. The rod-like member 17 is inserted through the elongated hole for tilt 15 and the through hole 16 in the width direction.
[0005]
　An adjusting lever 23 provided at one end portion in the axial direction of the rod-like member 17, an anchor portion 24 provided at the other axial end portion of the rod-like member 17, and a portion near the one axial end of the rod- The cam device 25 constitutes a tilt lock mechanism for expanding and contracting the distance between the inner surfaces of the pair of support plate portions 22 based on the swing of the adjustment lever 23. The anchor portion 24 has a shape like a head portion of a bolt provided at the other axial end portion of the rod-shaped member 17, and has a first engagement convex portion 26 formed on the inner surface of the anchor portion 24 Has a tilt elongated hole 15 formed in a support plate portion 22 on the other (the right side in FIG. 10) of the pair of support plate portions 22, which faces the inner side surface of the anchor portion 24, and a tilt long hole 15 So that only the displacement along the axis of rotation is engaged. Therefore, although the rod member 17 can move up and down along a pair of elongated holes 15 for tilting, it will not rotate about the axis of the rod 17.
[0006]
　A cam device 25 is incorporated in the steering wheel position adjusting device as shown in FIG. 11, which is a combination of the driving side cam 27 and the driven side cam 28. The drive side cam 27 has a center hole 29 for inserting the rod-like member 17, and the whole is formed in a circular ring plate shape, and the driven side cam 28 is provided with a hole 29 for inserting the rod- And has a center hole 30, and the whole is formed in a circular ring plate shape. On the opposing surfaces of the driving side cam 27 and the driven side cam 28, a drive side cam surface 31 and a driven side cam surface 32, which are irregular surfaces in the circumferential direction, are formed. The driving side cam surface 31 provided on the inner side surface of the driving side cam 27 has a driving side reference surface 33 having a flat surface shape and a driving side reference surface 33 projecting inward in the width direction from a plurality of circumferentially equally spaced positions on the driving side reference surface 33 And a plurality of driving side convex portions 34. The driven side cam surface 32 provided on the outer side surface of the driven side cam 28 has a flat surface like driven side reference surface 35 and a plurality of circumferentially equidistantly spaced positions on the driven side reference surface 35 in the width direction And a plurality of driven side convex portions 36 projecting outward. A second engaging convex portion 37 is formed on the inner surface of the driven side cam 28.
[0007]
　The second engaging projection 37 of the driven side cam 28 is provided on the supporting plate portion 22 (the left side in FIG. 10) opposed to the inner side surface of the driven side cam 28 of the pair of supporting plate portions 22 Only the displacement along the tilt elongated hole 15 is engaged with the formed elongated tilt hole 15 to enable it. Therefore, although the driven side cam 28 can move up and down along the long hole 15 for tilting, it will not rotate about the axis of the driven side cam 28. The proximal end portion of the adjustment lever 23 is coupled and fixed to the drive side cam 27, and the drive side cam 27 is structured so as to reciprocate around the rod-shaped member 17 as the control lever 23 reciprocates. Has been done.
[0008]
　When adjusting the position of the steering wheel 1, the adjustment lever 23 is pivoted in a predetermined direction (generally downward), so that the drive side cam 27 is rotated in the unlock state, that is, the lock release 12 (A), by alternately arranging the driving side convex portion 34 and the driven side convex portion 36 in the circumferential direction, the cam device 25 (right side in FIG. 12) The unlocked state in which the axial dimension of the driven side cam 28 is reduced and the distance between the driven side cam 28 and the anchor part 24 is expanded. As a result, the surface pressure of the contact portion between the inner surface of the pair of support plate portions 22 and the outer surface of the pair of held plate portions 21 is reduced or lost, and the inner diameter of the front end portion of the outer column 18 is The surface pressure of the contact portion between the inner peripheral surface of the front end portion of the outer column 18 and the outer peripheral surface of the rear end portion of the inner column 19 is lowered. In this state, it is possible to adjust the vertical position and the longitudinal position of the steering wheel 1 within the range in which the rod-like member 17 can move within the tilt elongated hole 15 and the through hole 16.
[0009]
　In order to hold the steering wheel 1 at a desired position, after moving the steering wheel 1 to a desired position, the adjusting lever 23 is pivoted in a reverse direction (generally upward), so that the driving side cam 27 is locked (The left direction in FIG. 12) which is the rotation direction at the time of switching to the state. When the driving side cam 27 is rotated in the locking direction, as shown in FIG. 12 (B), among the circumferential side surfaces of the driving side convex portion 34 formed on the driving side cam surface 31, the front side , The drive side guide slope surface 38 is formed on the driven side guide slope 39 located on the rear side with respect to the lock direction among the circumferential side surfaces of the driven side convex portion 36 formed on the driven side cam surface 32 Slidingly guided and moves up the driven side guide slope 39. As a result, as shown in FIG. 12 (C), the flat surface-shaped front end surface 40 of the driving-side convex portion 34 and the flat surface-shaped front end surface 41 of the driven-side convex portion 36 abut each other, and the cam device 25 A locked state in which the axial dimension is enlarged, and the distance between the inner surfaces of the pair of support plate portions 22 is reduced. As a result, the contact pressure between the inner surface of the pair of support plate portions 22 and the outer surface of the pair of the clamped plate portions 21 increases, and the inner diameter of the front end portion of the outer column 18 is elastically deformed So that the surface pressure of the contact portion between the inner peripheral surface of the front end portion of the outer column 18 and the outer peripheral surface of the rear end portion of the inner column 19 is increased and the steering wheel 1 is held at the desired position after the adjustment.
[0010]
　In the position adjusting device of the steering wheel incorporating the cam device 25 as described above, in the locked state, the driving side cam 27 and the driven side cam 28 are relatively easily rotated relative to each other, and the adjusting lever 23 is erroneously impacted or the like There is a possibility of causing a problem that the locked state is easily released.
[0011]
　Japanese Patent Application Laid-Open No. 2002-087286 discloses a structure in which a drive side convex portion provided on a drive side cam is inclined in a direction opposite to a drive side guide slope formed on a circumferential side surface of the drive side convex portion A structure in which the driving side cam is less likely to rotate relative to the driven side cam in the unlocking direction by forming the inclined portion is described. However, in the case of the structure described in Japanese Unexamined Patent Application Publication No. 2002-087286, there is a possibility that the gradient portion will be worn out for a long period of use and the relative rotation of the driving side cam with respect to the driven side cam can not be effectively prevented There is a possibility that the operating force of the adjusting lever when the tip end face of the driven side protruding portion rides on the top portion of the inclined portion becomes excessive and the operability of the adjusting lever is deteriorated.
Prior Art Document

Patent literature

[0012]
Patent Document 1: JP-A-2009-227181
Patent Document 2: JP-A-2002-087286
Summary of the invention

Problem to be Solved by Invention

[0013]
　SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, an object of the present invention is to effectively prevent relative rotation of a driving side cam with respect to a driven side cam in a locked state, It is aimed to realize the structure of the cam device which can smooth the operating force of the lever.
Means for solving the problem

[0014]
　The cam device of the present invention includes a driving side cam rotatably supported and a driven side cam supported to be nonrotatable.
[0015]
　The driving side cam has, for example, a circular ring plate shape and has a driving side cam surface which is provided on one side surface in the axial direction thereof and which is an uneven surface in the circumferential direction. The driving side cam surface is provided in a state of protruding toward the one side in the axial direction from a plurality of positions in the circumferential direction of the driving side reference surface and a driving side guiding inclined surface on one side surface in the circumferential direction And a plurality of driving side convex portions.
[0016]
　The driven side cam is, for example, a circular ring plate shape or a rectangular plate shape and is provided on the other axial side surface opposed to the driving side cam surface in the axial direction and is a driven side cam Face. The driven side cam surface is provided in a state of protruding to the other side in the axial direction from a plurality of positions in the circumferential direction of the driven side reference surface and a driven side guide And a plurality of driven side convex portions, preferably the same number as the driving side convex portions, having inclined surfaces. The driven side cam is nonrotatably supported by a mating member such as a support bracket or a friction plate opposing to each other in the axial direction. For this purpose, for example, on one side surface in the axial direction of the driven side cam, an engaging convex portion to be engaged with the corresponding member is provided.
[0017]
　The cam device alternately arranges the driving side convex portion and the driven side convex portion in the circumferential direction by relatively rotating the driving side cam with respect to the driven side cam, By abutting the unlocked state in which the axial dimension of the cam device is reduced and the distal end surface (top surface) of the driving side convex portion and the distal end surface (top surface) of the driven side convex portion, the cam device And a locked state in which the axial dimension of the driven side slope surface is enlarged, can be switched via a state of sliding contact between the drive side guide slope surface and the driven side guide slope surface.
[0018]
　In particular, in the cam device of the present invention, a tip abutting portion is provided on an outer diameter side portion of a convex portion of one of the driving side cam and the driven side cam, for example, a radially outer half portion A tip concave portion recessed axially from the tip end abutting portion is provided on the inner diameter side portion of the convex portion of the one cam, for example, the radially inner half portion.
[0019]
　Preferably, a guide slope (one of the drive side guide slope and the driven side guide slope of the convex portion of the one cam (one of the driving side convex portion and the driven side convex portion) ), An inclined sliding contact portion is provided, an inclined recess portion recessed axially from the inclined sliding contact portion is provided on the outer diameter side portion of the guide inclined face of the projecting portion of the one cam, The tip butt section is provided radially outward of the slant sliding contact section.
[0020]
　It is preferable that the inclined sliding contact portion and the tip end butted portion are provided in a continuous state.
[0021]
　Preferably, a cutout portion recessed inward in the radial direction is provided at a position at least one position in the circumferential direction of the outer peripheral edge portion of the one cam, the recess portion having a phase with respect to the circumferential direction including the inclined recess portion, At least one point in the circumferential direction of the outer diameter side portion of the cam surface (one of the driving side cam surface and the driven side cam surface) of the other one of the driving side cam and the driven side cam The stopper protrusion is provided in a state in which the phase with respect to the circumferential direction protrudes in the axial direction at the portion aligned with the convex portion of the other cam, so that in the locked state, the cam device moves the cutout Side cam surface in a circumferential direction and the other circumferential surface of the stopper protrusion are brought into contact with each other so that the driving side cam is rotated in a locking direction which is a rotating direction of the driving side cam when switching to the locked state To prevent it from rotating further It is.
[0022]
　A steering wheel position adjusting device according to the present invention includes a steering column, a displacement bracket, a support bracket, a pair of tilt long holes, a through hole, a rod member, an anchor portion, a pressing portion, a cam Device.
[0023]
　The steering column is swingably displaceable about a tilt axis arranged in the width direction.
[0024]
　A steering shaft is rotatably supported inside the steering column.
A steering wheel is fixed to a portion projecting from the end opening of the steering column.
[0025]
　The displacement bracket is provided at an axially intermediate portion of the steering column.
[0026]
　The support bracket has a pair of support plate portions that nip the displacement bracket, and is supported by the vehicle body.
[0027]
　Wherein the pair of tilt elongated holes are formed in a portion that is aligned with each other of the pair of support plate portions, for example, in a partial arc shape with the tilt axis as the center or in a tangential direction of an arc with the tilt axis as the center It is linear and extends in the vertical direction.
[0028]
　The through hole is, for example, a circular hole or an elongated hole extending in the front-rear direction, and is formed in a state of penetrating in the width direction at a portion matching the part of the pair of tilt long holes among the displacement brackets Has been done.
[0029]
　The rod-like member is inserted through the long hole for tilting and the through hole in the width direction.
[0030]
　The pressing portion is provided at a portion protruding from an outer side surface of one of the pair of support plate portions at one end portion of the rod member.
[0031]
　The anchor portion is provided at a portion projecting from an outer surface of the other support plate portion of the pair of support plate portions at the other end portion of the rod member.
[0032]
　The cam device expands and contracts a space between the anchor portion and the pressing portion.
[0033]
　In the steering wheel position adjusting device of the present invention, the cam device of the present invention is used as the cam device, and the driven side cam constituting the cam device functions as the pressing portion. The drive side cam constituting the cam device is capable of rotating with respect to one end portion of the rod-like member about the rod-like member and restraining the displacement toward the one end side of the rod-shaped member It is supported in the condition. A thrust is provided between the member rotating in synchronization with the driving side cam or the driving side cam and the nonrotating member provided at a position opposed to the axial direction of the rod type member around the rod member, Bearings are provided. The driving side cam may be fitted to the rod-shaped member so as to be rotatable relative to the rod-shaped member or rotatable synchronously with the rod-shaped member.
Effect of the Invention

[0034]
　Advantageous Effects of Invention According to the cam device and the position adjusting device of the steering wheel of the present invention, it is possible to effectively prevent relative rotation of the driving side cam with respect to the driven side cam in the locked state, smoothly setting the operating force of the adjusting lever can do. That is, the tip abutting portion is provided on the outer diameter side portion of the tip end surface of the convex portion of one of the driving side cam and the driven side cam, and the inner diameter of the tip end face of the convex portion of the one cam A tip recessed portion recessed relative to the axial direction than the tip end butted portion is provided on the side portion. Therefore, in the locked state, only the tip butting portion provided on the outer diameter side portion of the tip end face of the convex portion of the one cam is pressed against the other cam of the driving side cam and the driven side cam The distal end concave portion provided on the inner diameter side portion of the distal end surface of the convex portion of the one cam is abutted against the distal end surface of the convex portion of the other cam so as to butt against the distal end surface of the convex portion can do. Therefore, when the driving side cam tries to rotate relative to the driven side cam in the locked state, the cam device of the present invention is characterized in that the distance between the distal end surface of the driving side protruding portion and the driven side protruding portion The distance between the point of application of the frictional force generated between the end surface and the rotation center of the driving side cam can be made larger than in the case of the conventional structure shown in FIG. Thus, when the driving side cam is relatively rotated in the unlocking direction, a moment force acting on the driving side cam in a direction to prevent the relative rotation can be increased. As a result, it is possible to effectively prevent relative rotation of the driving side cam in the unlocking direction with respect to the driven side cam in the locked state without impairing the operating force of the adjusting lever.
Brief Description of the Drawings

[0035]
FIG. 1 is a perspective view schematically showing a steering apparatus incorporating an example of an embodiment of a position adjusting apparatus of a steering wheel of the present invention.
FIG. 2 is a perspective view of an example of a position adjustment device of a steering wheel according to the present invention.
3 is an exploded perspective view of the position adjustment device of the steering wheel shown in FIG. 2. FIG.
FIG. 4 is a cross-sectional view of the steering wheel position adjusting device shown in FIG. 2, corresponding to FIG. 10.
FIG. 5 (A) is a perspective view of a driven side cam constituting an example of the embodiment of the cam device of the present invention, and FIG. 5 (B) is a front view thereof.
6 (A) is a perspective view of a driving side cam constituting an example of the embodiment of the cam device of the present invention, and FIG. 6 (B) is a front view thereof.
7 (A) to 7 (C) are diagrams showing the results of a simulation performed to confirm the effect of the present invention, and FIG. 7 (A) is a graph showing the relationship between the present invention depending on the presence / 7 (B) shows the difference between the present invention and the conventional structure depending on the presence / absence of the inclined recessed portion, and FIG. 7 (C) shows the difference between the present invention and the conventional structure with and without the front end recessed portion and the inclined recessed portion Respectively.
[Fig. 8] Fig. 8 is a partial side view showing an example of a steering apparatus having a conventional structure.
[Fig. 9] Fig. 9 is a partial side view of a position adjusting device of a conventional steering wheel.
FIG. 10 is a sectional view taken along line AA in FIG. 9.
11 (A) is a schematic view of a driving side cam constituting a cam device of a conventional structure as viewed from the front, and FIG. 11 (B) is a schematic view of the driven side cam viewed from the front FIG. 11 (C) is a schematic view of the driven side cam as viewed from the rear side.
12 (A) is a schematic cross-sectional view showing the unlocked state of the cam device of the conventional structure, and FIG. 12 (B) is a cross-sectional view showing a state in which the cam device of the conventional structure is switched from the unlocked state to the locked state FIG. 13 (c) is a schematic cross-sectional view showing the locked state of the cam device of the conventional structure.
MODE FOR CARRYING OUT THE INVENTION

[0036]
　1 to 7 show one example of the embodiment of the present invention. When the rotation of the steering wheel 1 a rotates, the rotation of the steering wheel 1 a is transmitted to the input shaft 3 a of the steering gear unit 2 a, and along with the rotation of the input shaft 3 a, a pair of right and left tie rods 4 a Is pushed and pulled, and a steering angle is given to the front wheels.
[0037]
　The steering wheel 1 a is supported and fixed to the rear end portion of the steering shaft 5 a, and the steering shaft 5 a is rotatably supported by the steering column 6 a in a state where the steering shaft 5 a is axially inserted through the cylindrical steering column 6 a . The front end portion of the steering shaft 5 a is connected to the rear end portion of the intermediate shaft 8 a via a universal joint 7 a and the front end portion of the intermediate shaft 8 a is connected to the input shaft 3 a via another universal joint 9 a . An electric motor 42 serving as a power source for applying a steering assist force to the steering shaft 5 a is provided in front of the steering column 6 a.
[0038]
　By steering engagement between the front end portion of the outer shaft 43 on the rear side (the right side in FIG. 2) and the rear end portion of the inner shaft 44 on the front side (the left side in FIG. 2), the steering shaft 5 a transmits the torque And is configured to enable expansion and contraction in the axial direction. The steering shaft 5 a is rotatably supported only by a rolling bearing such as a single row deep groove type inside the steering column 6 a in which the outer column 18 a and the inner column 19 a are extensibly combined.
[0039]
　A housing 10 a is fixed to the front end portion of the front inner column 19 a constituting the steering column 6 a, and the upper front end portion of the housing 10 a can be swung and displaced with respect to the vehicle body by the tilt shaft 12 a arranged in the width direction It is supported by. In the housing 10 a, a worm type speed reducer and the like constituting an electric assist mechanism, including a worm and a worm wheel, and the like are housed. The electric assist mechanism rotates the worm by the electric motor 42 fixed to the housing 10a according to the torque acting on the inner shaft 44 so as to impart the steering assist force to the steering shaft 5a .
[0040]
　The upper front end portion of the housing 10a is supported so as to be swingably displaced about the tilt shaft 12a, thereby constituting a mechanism capable of adjusting the vertical position of the steering wheel 1a, and the steering shaft 5a and the steering column 6a Thereby making it possible to adjust the longitudinal position of the steering wheel 1 a. In order to hold the steering wheel 1 a in the adjusted position, the displacement bracket 13 a is fixed to a part of the steering column 6 a, and the support bracket 14 a is supported on the vehicle body side. A slit 20 a extending in the front-rear direction is provided at the upper end portion of the front portion of the outer column 18 a, and the inner diameter of the front portion of the outer column 18 a can be elastically expanded and contracted. On a portion of the outer peripheral surface of the outer column 18 a that sandwiches the slit 20 a from the left and right sides, a pair of clamped plate portions 21 a constituting the displacement bracket 13 a is provided. A pair of through holes (telescopic long holes) 16 a extending in the front-rear direction are provided in the pair of held plate portions 21 a. When the telescopic mechanism is omitted, the through hole 16a is formed by a circular hole.
[0041]
　The support bracket 14 a is provided in a state of sandwiching the displacement bracket 13 a from both sides in the width direction. The support bracket 14 a includes an attachment plate portion 45 provided on the upper portion and a pair of right and left support plate portions 22 a hanging downward from the attachment plate portion 45. A pair of notch grooves opening to the rear end edges are formed at both end portions in the width direction of the attachment plate portion 45. The support bracket 14a is fixed to the vehicle body to the vehicle body by a joining member such as a bolt and a stud The pair of separating members 46 are engaged with the pair of cutout grooves so that they are supported so as to be detached forward in the secondary collision. A pair of tilt elongated holes 15 a having a partial circular arc shape with the tilt shaft 12 a as the center is formed in the mutually aligned portions of the pair of support plate portions 22 a in a state of being extended in the vertical direction.
[0042]
　The rod-shaped member 17a passes through the long hole 15a for tilt and the through hole 16a in the width direction. On one end portion side in the axial direction of the rod-shaped member 17a, a portion projecting from one of the pair of support plate portions 22a (left side in FIG. 4) from the support plate portion 22a, the side of the one support plate portion 22a , A friction assembly 49 b, a driven side cam 28 a, a drive side cam 27 a, an adjustment lever 23 a, and a thrust bearing 50 are arranged in this order. Between the head portion 47 provided at the other axial end portion of the rod-like member 17 a and the support plate portion 22 a on the other (right side in FIG. 4) of the pair of support plate portions 22 a, the anchor A rectangular pressing plate 48 constituting a part and a friction assembly 49a are arranged. A nut 52 is threadedly engaged with a male screw portion 51 formed at one axial end portion of the rod member 17 a.
[0043]
　The inner surface of the rectangular pressing plate 48 is formed in a state bent outward in the width direction from the upper and lower edges of the elongated hole formed in the telescopic friction plate 55 among the telescopic friction plates 55 constituting the friction assembly 49a The rectangular pressing plate 48 is prevented from rotating relative to the telescopic friction plate 55 or being displaced in the vertical direction by engaging with the pair of bent portions thus formed.
[0044]
　Each of the pair of friction assemblies 49a and 49b is formed by laminating a plurality of types of friction plates. The friction assembly 49a disposed between the other support plate portion 22a and the rectangular pressing portion 48 includes three kinds of friction plates, that is, an annular friction plate 53, a tilt friction plate 54, and a telescopic friction plate 55 As shown in FIG. The friction assembly 49 b disposed between the one support plate portion 22 a and the driven side cam 28 a is formed by laminating two kinds of friction plates of an annular friction plate 53 and a tilt friction plate 54 Has been done.
[0045]
　The circular ring friction plate 53 has a through hole for inserting the rod member 17 a in the center portion, and the whole is formed in a circular ring shape.
[0046]
　The tilt friction plate 54 is formed in a state of extending in the vertical direction, and an elongated hole extending in the vertical direction for inserting the rod-like member 17 a for insertion of the rod-like member 17 a is formed at the vertically middle portion, and at the lower end portion thereof , An attachment hole which is a circular hole is formed. The tilt friction plate 54 is supported by the support bracket 14 a by inserting a fixing pin 56 provided in the mounting hole in a state of protruding in the width direction from the outer surface of the pair of support plate portions 22 a ing.
[0047]
　The telescopic friction plate 55 is formed to extend in the front-rear direction, and has an elongated hole extending in the front-rear direction for inserting the rod-shaped member 17 a at the middle portion in the front-rear direction, and the rear end portion , An attachment hole which is an elongated hole extending in the vertical direction is formed. The telescopic friction plate 55 is provided in the attachment hole so as to protrude in the width direction from the outer surface of the other clamped plate portion 21 a (the right side in FIG. 4) of the pair of clamped plate portions 21 a And is supported by the outer column 18 a by inserting the fixed pin 57. The telescopic friction plate 55 is disposed in a state of sandwiching one outermost tilt friction plate 54 among the tilt friction plates 54 constituting the friction assembly 49 a from both sides in the width direction. In the telescopic friction plate 55 facing the rectangular pressing plate 48, the telescopic friction plate 55 is bent outward in the width direction from both upper and lower edges of the elongated hole, and a 1 A bent portion of a pair is provided.
[0048]
　A synthetic resin sleeve 58 is externally fitted around a portion of the rod-like member 17 a, which is disposed inside the friction assemblies 49 a, 49 b. A flange portion 59 having a rectangular plate shape is formed on the outer peripheral surface of the inner end portion in the width direction of the sleeve 58. The flange portion 59 has a tilt long hole 15a in the tilt long hole 15a of the pair of support plate portions 22a So that only displacement along 15a is engaged. The sleeve 58 is used for subassembling the friction assemblies 49 a, 49 b by combining the circular wheel friction plate 53, the tilt friction plate 54, and the telescopic friction plate 55. A cylindrical collar 60 and a coil spring 61 are disposed inside the through hole 16 a of the pair of held plate portions 21 a. The coil spring 61 is elastically compressed between the collar 60 and the flange portion 59. By adopting such a configuration, the frictional force acting between the driving side cam 27 a and the driven side cam 28 a is enhanced.
[0049]
　The driven side cam 28 a is combined with the driving side cam 27 a to form the cam device 25 a. In this example, the driven side cam 28 a is one of the cams and functions as the pressing portion. The driven side cam 28a is made of a sintered metal and has a center hole 30a through which the rod member 17a is inserted, and the whole is formed in a substantially rectangular plate shape. On the outer side surface (the upper surface in FIG. 5 (A)) of the driven side cam 28 a, a driven side cam surface 32 a which is an uneven surface in the circumferential direction is formed.
[0050]
　The driven-side cam surface 32 a is a flat surface-shaped driven-side reference surface 35 a and a plurality of circumferentially equidistantly-spaced positions (four positions in the illustrated example) of the driven-side reference surface 35 a, outward in the width direction And a driven side convex portion 36 a projecting and having a substantially trapezoidal cross section.
[0051]
　On the rear side face in the locking direction, which is the rotating direction of the driving side cam 27 a when switching to the locked state, of the both side surfaces in the circumferential direction of the driven side convex portion 36 a, a smoothly inclined covering from the driven side reference face 35 a A driving side guide slope 39a is formed. A driven side stopper surface 62 having a slightly inclined wall surface shape is formed on the front side surface in the locking direction of both circumferential side surfaces of the driven side convex portion 36 a. The inclination of the driven side stopper surface 62 corresponds to the draft angle necessary for removing the driven side cam 28 a from the forming die.
[0052]
　On the outer diameter side half portion of the front end surface 41 a which is the top surface of the driven side convex portion 36 a, a flat surface-like tip abutting portion 63 existing on a virtual plane orthogonal to the central axis of the driven side cam 28 a A front end recessed portion 64 recessed by a predetermined amount in the axial direction is formed in the inner diameter side half portion of the tip end surface 41 a as compared with the tip butt portion 63. Therefore, in the locked state, only the tip butting portion 63 of the front end face 41 a comes into contact with the front end face 40 a of the driving side convex portion 34 a. The extent to which the distal end concave portion 64 is recessed in the axial direction with respect to the distal end abutting portion 63 can be arbitrarily determined as long as the condition that the distal end concave portion 64 does not abut the distal end surface 40 a of the drive side convex portion 34 a is satisfied Can be, for example, about 1/8 to 1/10 of the dimension in the axial direction from the driven side protruding portion 36a, that is, the driven side reference surface 35a to the tip butt portion 63.
[0053]
　An inclined sliding contact portion 65 is formed on the inner diameter side half portion of the driven side guiding inclined surface 39a and on the outer diameter side half portion of the driven side guiding inclined surface 39a, And an inclined recessed portion 66 recessed into the recessed portion 66 is formed. Therefore, when the driving side cam 27a is rotated, only the inclined sliding contact portion 65 of the driven side guide inclined surface 39a comes into sliding contact with the driven side guide inclined surface 38a of the driving side cam 28a. The inclined recesses 66 are recessed by a certain amount in the axial direction with respect to the inclined sliding contact portion 65 in the same circumferential position (the portion having the same phase in the circumferential direction). The extent to which the inclined recess 66 is recessed in the axial direction from the inclined sliding contact portion 65 can be arbitrarily determined as long as the condition that the inclined recess 66 does not come into sliding contact with the drive side guide slope 38 a is arbitrary, , About 1/8 to 1/10 of the axial dimension of the driven side convex portion 36a. The inclined sliding contact portion 65 and the inclined recessed portion 66 are formed by curvedly inclined convex curved surfaces. Among the circumferential end edges of the inclined sliding contact portion 65, the axial height dimension of the rear side end in the locking direction excluding the chamfered portion is equal to the axial height dimension of the tip butt portion 63 .
[0054]
　A tip abutting portion 63 is provided on the outer diameter side half portion of the leading end surface 41 a which is the top surface of the driven side convex portion 36 a and is inclined to the inner diameter side half portion of the driven side guiding inclined surface 39 a which is the circumferential side surface A sliding contact portion 65 is provided. That is, the butt end butt portion 63 is disposed radially outward of the slant sliding contact portion 65. In other words, the inclined sliding contact portion 65 and the front end recessed portion 64 are arranged in a circumferentially adjacent state in the radially inner half portion of the driven side cam surface 32 a, and the driven side cam surface 32 a , The inclined recess 66 and the tip butt portion 63 are arranged in a circumferentially adjacent state in the radially outer half portion.
[0055]
　In order to smoothly connect the tip butt section 63 and the slant slide contact section 65 without interposing a step or the like, the front end edge in the locking direction among the circumferential end edges of the slant sliding contact section 65 ) Is slightly smaller in the locking direction than the end edge on the rear side in the locking direction (the portion denoted by reference symbol b in FIG. 5) of the circumferential end edges of the butt end butt portion 63 It is located on the front side. 5) of the inclined sliding contact portion 65 and the rear end edge of the both end edges of the tip butt portion 63 in the circumferential direction (the reference mark b in FIG. 5 is referred to as " Is attached to the inclined sliding contact portion 65 in such a manner that it is bent at a substantially right angle and the front end edge in the locking direction among the both circumferential edges of the inclined sliding contact portion 65 ) And the inner peripheral edge portion (the portion denoted by reference symbol d in FIG. 5) of the butt end butt portion 63 are continuously bent at a substantially right angle.
[0056]
　5) and the inner peripheral edge portion (the portion denoted by reference symbol d in FIG. 5) of the tip butt portion 63 are substantially identical to each other The outer peripheral edge portion of the inclined sliding contact portion 65 may be arranged radially outward of the inner peripheral edge portion of the front end abutting portion 63 although it is disposed on a circle. When the outer peripheral edge portion of the inclined sliding contact portion 65 is arranged radially outward of the inner peripheral edge portion of the tip butt portion 63, the front edge in the locking direction among the circumferential end edges of the inclined sliding contact portion 65 5), and the circumferential direction between the circumferential end edges of the butt end butt portion 63 and the rear end edge relating to the locking direction (the portion denoted by reference symbol b in FIG. 5) It is also possible to match the position.
[0057]
　Of the circumferential end edges of the inclined sliding contact portion 65, the front end edge (the portion denoted by the reference symbol a in FIG. 5) in the locking direction is defined as the rear end portion of the circumferential end edges of the front end abutting portion 63 In the case of disposing the inclined sliding contact portion 65 and the tip butt portion 63 in the radial direction with respect to the lock direction with respect to the locking direction with respect to the end edge (the portion denoted by reference symbol b in FIG. 5) of the inclined sliding contact portion 65 and the tip end abutting portion 63 have the same height dimension in the axial direction is only one position with respect to the circumferential direction out of the overlapping range. Therefore, a portion located on the front side in the locking direction of the inclined sliding contact portion 65 with the circumferential position at which the inclined sliding contact portion 65 and the tip end butted portion 63 are aligned in the axial direction, An escape portion such as chamfering is provided at a portion located on the rear side in the locking direction of the tip butt portion 63 and an axial height dimension of the tip butt portion 63 at the rear side in the locking direction from the boundary is inclined sliding contact Portion 65, or in the front side in the locking direction from the boundary, the axial height dimension of the inclined sliding contact portion 65 is higher than the axial height dimension of the tip butt portion 63 It is prevented from becoming it.
[0058]
　In the outer peripheral edge portion of the driven side cam 28 a, at two positions on the opposite side in the diameter direction across the center hole 30 a and in the portion including the inclined recessed portion 66 with respect to the circumferential direction, a notch recessed inward in the radial direction Section 67 is formed. The cutout portion 67 is formed so as to straddle a pair of driven side convex portions 36 a arranged adjacent to each other in the circumferential direction. That is, one circumferential end portion of the cutout portion 67 cuts out a circumferential half portion of the tip butt portion 63 formed on one drive side convex portion 36 a of the driven side convex portion 36 a, The intermediate portion in the circumferential direction of the cutout portion 67 is cut out of the driven side reference surface 35 a existing between the driven side convex portions 36 a and the other circumferential end portion of the cutout portion 67 is cut Most part of the inclined recess 66 formed in the drive-side projection 36 of FIG. The cutout portion 67 is a portion for allowing the stopper projection 71 formed in the drive side cam 27 a to enter. On the front side face in the locking direction of the cutout portion 67, a stopper projection 71 is brought into contact with the front side face in the locked state, and a stopper face 68 for preventing the drive side cam 27 a from further rotating in the locking direction Are formed.
[0059]
　A pair of engaging protrusions 69 protruding inward in the width direction are provided at both end portions in the front-rear direction of the inner side surface of the driven side cam 28 a. A tilt friction plate 54 constituting a friction assembly 49 b arranged between the driven side cam 28 a and one of the support plate portions 22 a is disposed between the pair of engagement convex portions 69 , The driven side cam 28a is prevented from rotating relative to the friction assembly 49b.
[0060]
　The drive side cam 27 a constituting the cam device 25 a together with the driven side cam 28 a corresponds to the other cam. The drive side cam 27a is made of a sintered metal and has a center hole 29a for inserting the rod member 17a, and the whole is formed in a circular ring plate shape. On the inner side surface (the upper surface in FIG. 6 (A)) of the driving side cam 27 a, a driving side cam surface 31 a which is an uneven surface in the circumferential direction is formed.
[0061]
　The drive side cam surface 31a has a flat drive surface 33a and a plurality of circumferentially equally spaced protrusions (four in the illustrated example) protruding inward in the width direction of the drive side reference surface 33a , And a driving side convex portion 34 a having a substantially trapezoidal cross section.
[0062]
　On the front side surface in the locking direction of the both side surfaces in the circumferential direction of the driving side convex portion 34 a, a driving side guide slope surface 38 a which is smoothly inclined from the driving side reference surface 33 a is formed. The drive side guide slope 38 a is a linearly inclined flat surface and is formed in a range extending from the radial inner end portion to the outer end portion of the drive side cam surface 31 a. A driving side stopper surface 70 having a slightly inclined wall surface shape is formed on the rear side surface in the locking direction of both circumferential side surfaces of the driving side convex portion 34 a. The inclination of the driving side stopper surface 70 corresponds to the draft angle necessary for taking out the driving side cam 27 a from the forming die.
[0063]
　The tip end surface 40 a which is the top surface of the driving side convex portion 34 a is formed in a flat surface shape existing on a virtual plane orthogonal to the central axis of the driving side cam 27 a. The distal end surface 40 a is formed in a range extending from the radially inner end portion to the outer end portion of the driving side cam surface 31 a except for the portion where the stopper projection portion 71 is provided.
[0064]
　In a portion of the outer diameter side portion of the driving side cam surface 31 a which is located on the opposite side in the diametrical direction across the center hole 29 a and which is aligned with the front end face 40 a in the circumferential direction, A pair of stopper projections 71 projecting inward are provided. The stopper projection 71 is advanced into the cutout portion 67 formed in the outer peripheral edge portion of the driven side cam 28a and the stopper projection 71 is brought into contact with the stopper surface 68 in the locked state, 27a is prevented from rotating further in the locking direction. On the other hand, in the unlocked state, by bringing the driving side stopper surface 70 and the driven side stopper surface 62 into contact with each other, the driving side cam 27 a is prevented from rotating further in the lock releasing direction.
[0065]
　An engaging projection 72 having a non-circular cross section projecting outward in the width direction is provided on the outer side surface of the driving side cam 27a. The engagement protrusion 72 non-rotatably engages with the engagement hole formed in the base end portion of the adjustment lever 23 a so that the drive side cam 27 a can reciprocate rotate as the adjustment lever 23 a reciprocally swings . In the illustrated example, the drive side cam 27 a is configured to rotate relative to the rod member 17 a based on the operation of the adjustment lever 23 a. However, a structure in which the rod-like member rotates in synchronization with the driving-side cam can also be adopted.
[0066]
　The thrust bearing 50 disposed between the proximal end portion of the adjustment lever 23 a and the nut 52 includes a pair of annular ring shaped raceway rings and a plurality of radially arranged races between the pair of races And a needle of a book, which is constituted by thrust needle bearings. In the thrust bearing 50, dimensions of each part are set such that a gap exists inside the cam device 25a in a state where the cam device 25a is switched to the unlock state. The thrust bearing 50 gradually reduces the internal clearance at the stage where the cam device 25a is switched from the unlocked state to the locked state, that is, when the drive side guide slope 38a and the driven side guide slope 39a are in sliding contact with each other , The needle continues to roll until the needle starts rolling and becomes locked. In short, by providing the thrust bearing 50, the frictional force generated when the cam device 25a is switched from the unlocked state to the locked state can be reduced, and the rotating operation of the adjusting lever 23a can be smoothed.
[0067]
　In order to adjust the position of the steering wheel 1a, the adjustment lever 23a is swung in a predetermined direction (generally downward) to rotate the drive side cam 27a in the lock release direction. By disposing the drive side protrusion 34a and the driven side protrusion 36a alternately in the circumferential direction, the cam device 25a is set in the unlocked state in which the axial dimension of the cam device 25a is reduced, and the driven side The distance between the cam 28a and the rectangular pressing plate 48 as the anchor portion is expanded. As a result, the surface pressure of the contact portion between the inner surface of the pair of support plate portions 22 a and the outer surface of the pair of held plate portions 23 a, the surface pressure of the fitting portion between the outer column 18 a and the inner column 19 a The pressure decreases or is lost. In this state, it is possible to adjust the vertical position and the front / rear position of the steering wheel 1a within a range in which the rod member 17a can move within the tilt long hole 15a and the through hole 16a.
[0068]
　When adjusting the vertical position of the steering wheel 1 a, the circular wheel friction plate 53 and the telescopic friction plate 55 constituting the friction assemblies 49 a and 49 b move together with the rod-like member 17 a in the vertical direction, but the tilt friction The plate 54 is not displaced. On the other hand, when adjusting the front-rear position of the steering wheel 1 a, the telescopic friction plate 55 moves in the front and rear direction together with the outer column 18 a, but the circular wheel friction plate 53 and the tilt friction plate 54 do not displace.
[0069]
　In order to hold the steering wheel 1a in the adjusted position, when the adjusting lever 23a is swung in the reverse direction (generally upward) after the steering wheel 1a is moved to a desired position, the driving side convex portion Side guide slope surface 38a formed on the circumferential side surface of the driven side convex portion 34a slidably contacts the driven side guide inclined surface 39a formed on the side surface in the circumferential direction of the driven side convex portion 36a and the driven side guide slope 39a. The planar leading end surface 40 a of the driving side protruding portion 34 a and the flat surface shaped distal end surface 41 a of the driven side protruding portion 36 a come into contact with each other to bring the cam device 25 a into a locked state in which the axial dimension of the cam device 25 a is enlarged , The interval between the inner surfaces of the pair of support plate portions 22a is shortened. In this state, the contact pressure between the inner surface of the pair of support plate portions 22 a and the outer surface of the pair of held plate portions 23 a, the surface pressure of the fitting portion between the outer column 18 a and the inner column 19 a The surface pressure rises, and the steering wheel 1 is held in the adjusted position. Since the circular wheel friction plate 53, the tilt friction plate 54, and the telescopic friction plate 55 are sandwiched with each other, the force for holding the position of the steering wheel 1 a in the locked state can be increased.
[0070]
　According to the steering column device of this example, in the locked state, it is effectively prevented that the driving side cam 27 a relatively rotates with respect to the driven side cam 28 a, and it is possible to smooth the operating force of the adjusting lever it can. That is, the tip abutting portion 63 is provided on the outer diameter side portion of the front end face 41 a of the driven side convex portion 36 a provided in the driven side cam 28 a, and the tip abutting portion A tip concave portion 64 recessed with respect to the axial direction is provided. Therefore, in the locked state, only the tip butting portion 63 provided on the outer diameter side portion of the front end face 41 a of the driven side convex portion 36 a is provided on the front end face 40 a of the driving side convex portion 34 a of the driving side cam 27 a The cam device 25 a is configured so that the distal end concave portion 64 provided on the inner diameter side portion of the distal end surface 41 a of the driven side convex portion 36 a is not abutted against the distal end surface 40 a of the driving side convex portion 34 a ing. Therefore, in the locked state, when the drive side cam 27 a tries to rotate relative to the driven side cam 28 a, the cam device 25 a of the present example is configured such that the leading end face 40 a of the drive side protrusion 34 a and the driven side protrusion It is possible to increase the distance between the point of application of the frictional force generated between the driving side cam 27a and the distal end surface 41a of the driving side cam 27a and the rotational center of the driving side cam 27a as compared with the conventional structure shown in FIG. This makes it possible to increase the moment force acting on the driving side cam 27 a in the direction of preventing the relative rotation when the driving side cam 27 a is relatively rotated in the unlocking direction. As a result, it is possible to effectively prevent relative rotation of the driving side cam 27a with respect to the driven side cam 28a in the unlocking direction in the locked state, so that the operating force of the adjusting lever can be smoothed. Further, even when an impact or the like is erroneously applied to the adjustment lever 23 a, the locked state is not easily released.
[0071]
　An inclined sliding contact portion 65 is provided on the inner diameter side portion of the driven side guide slope 39a of the driven side protruding portion 36a and an inclined sliding contact portion 65 is provided on the outer diameter side portion of the driven side guide slope 39a An inclined recessed portion 66 recessed in the axial direction is provided. Therefore, when switching from the unlocked state to the locked state, only the inclined sliding contact portion 65 provided on the inner diameter side portion of the driven side guiding inclined surface 39 a is brought into sliding contact with the driving side guiding inclined surface 38 a of the driving side protruding portion 34 a The cam device 25 a is configured so that the inclined recess 66 provided in the outer diameter side portion of the driven side guide slope 39 a does not come into sliding contact with the drive side guide slope 38 a. Therefore, in order to switch from the unlocked state to the locked state, the cam device 25a of the present example is configured such that when the driving side cam 27a is relatively rotated in the locking direction with respect to the driven side cam 28a, the driving side guiding inclined surface 38a and the driven The distance between the point of application of the frictional force generated between the drive side cam 27a and the side guide slope 39a and the rotation center of the drive side cam 27a can be made smaller than in the case of the conventional structure shown in FIG. This makes it possible to reduce the moment force acting on the driving side cam 27 a in the direction of preventing the relative rotation when the driving side cam 27 a is relatively rotated in the locking direction. As a result, when switching from the unlocked state to the locked state, the force required to relatively rotate the drive side cam 27a can be reduced.
[0072]
　Since the cam device 25 a of the present example is provided in a state in which the inclined sliding contact portion 65 of the driven side protruding portion 36 a and the front end butted portion 63 are continued, at the time of switching from the unlocked state to the locked state, 27a can be smoothly and relatively rotated with respect to the driven side cam 28a. In other words, it is possible to prevent the operating force of the adjusting lever 23 a from suddenly becoming high or the like, and it is possible to stabilize the operating force of the adjusting lever 23 a.
[0073]
　Since the cutout portion 67 having the stopper surface 68 is provided in the portion including the inclined recessed portion 66 which does not substantially function as the cam surface among the driven side cam 28 a, the wasteful design as the cam device 25 a And the weight of the driven side cam 28a can be reduced.
[0074]
　Three types of simulations performed to confirm the effect of an example of the present embodiment will be described. First, as shown in FIG. 11, the structure in which the entire front end face of the driven side convex portion is a butt face, and the structure in which the tip end is formed on the inner diameter side half portion of the front end face of the driven side convex portion Simulation was carried out as to how the change in the operation force of the adjustment lever occurs with the structure in which only the outer diameter side half portion of the front end face is a butting surface by forming the concave portion. The conditions other than making the shape of the tip end face of the driven side convex portion different are all the same. As is clear from the simulation result shown in FIG. 7 (A), in the structure (solid line α) in which only the outer diameter side half portion of the front end face of the driven side convex portion is a butt face, a structure in which the entire front end face is a butt face (Broken line β), the lever operating force in the locked state (fastened state) increases, in other words, the lever hardly rotates relative to the lever.
[0075]
　Secondly, as shown in FIG. 11, the structure in which the entire driven side guiding slope of the driven side convex portion is a sliding contact surface and the structure in which the driven side guiding surface of the driven side convex portion And the structure in which only the inner diameter side half portion of the driven side guide surface is the sliding contact surface by forming the inclined recess portion in the outer diameter side half portion of the adjustment lever, , Simulation was carried out. The conditions other than making the shape of the driven side guide slope of the driven side convex portion different are all the same. As is clear from the simulation result shown in FIG. 7 (B), in the structure (solid line γ) in which only the inner diameter side half of the driven side guide slope of the driven side convex portion is the sliding contact surface, the entire driven guide slope The lever operating force from switching from the unlocked state to the locked state can be reduced as a whole compared to the structure (dashed line δ) in which the sliding contact surface is formed.
[0076]
　Thirdly, a structure in which the entire front end face of the driven side convex portion is a butt face and the whole of the driven side guide slope is a sliding contact face, and a structure in which, among the driven side convex portions, A structure in which only the outer diameter side half portion of the front end face serves as a butting face and only the inner diameter side half portion of the driven side guide slope face serves as the sliding contact face, and how the change in the operation force of the adjustment lever occurs Was carried out. The conditions other than making the shape of the distal end face of the driven side convex portion and the shape of the driven side guiding inclined face different are all the same. As is clear from the simulation result shown in FIG. 7 (C), only the outer diameter side half portion of the front end face of the driven side convex portion is a butt face, and only the inner diameter side half portion of the driven side guide slope face In the structure (solid line ε) as the sliding contact surface, the lock state is switched from the unlocked state to the locked state as compared with the structure (broken line ζ) in which the entire front end face is a butting face and the entire driven side guide slope is the sliding contact face , The lever operating force in the locked state can be increased, and the operating force of the lever can be smoothened as a whole (stabilized).
[0077]
　In one example of the present embodiment, a structure in which a tip butt portion is formed on the outer diameter side portion and a tip concave portion is formed on the inner diameter side portion is shown on the tip end face of the driven side convex portion constituting the driven side cam , When implementing the present invention, it is preferable that a tip abutting portion is formed on the outer diameter side portion of the front end face of the driving side convex portion constituting the driving side cam, and the tip side concave portion is formed on the inner diameter side portion of the front end face of the driving side convex portion Can be formed. Further, it is possible to form the inclined sliding contact portion and the inclined recess portion on the driving side protruding portion constituting the driving side cam, and it is also possible to adopt a configuration not forming the inclined sliding contact portion and the inclined recessed portion.
Explanation of sign

[0078]
　　1, 1 a steering wheel
　　2, 2 a steering gear unit
　　3, 3 a input shaft
　　4, 4 a tie rod
　　5, 5 a steering shaft
　　6, 6 a steering column
　　7, 7 a universal joint
　　8, 8 a intermediate shaft
　　9, 9 a universal joint
　10, 10 a housing
　11 Vehicle body 12, 12 a
　tilt shaft
　13, 13 a displacement bracket
　14, 14 a support bracket
　15, 15 a long hole for tilt
　16, 16 a through hole
　17, 17 a rod member
　18, 18 a outer column
　19, 19 a inner column
　20, 20 a slit
　21, 21 a to be clamped plate portion
　22, 22 a support plate portion 　23, 23 a
　adjustment lever
24 anchor portion
　25, 25 a cam device
　26 first
　engagement projection portion 27, 27 a drive side cam
　28, 28 a driven side cam
　29, 29 a center hole
　30 , 30a center hole
　31,31a drive side Ca Surface
　32,32a driven cam surfaces
　33,33a drive side reference surface
　34, 34 a driving side convex portion
　35, 35 a driven side reference surface
　36, 36 a driven side convex portion
　37 second engaging convex portion 38,
　38 a driving side guiding inclined
　surface 39, 39 a driven side guiding inclined
　surface 40, 40 a front end surface
　41, 41 a front end surface
　42 electric motor
　43 outer shaft
　44 inner shaft
　45 mounting plate part
　46 detaching capsule
　47 head part
　48 rectangular pressing plate 49 a, 49
　b friction assembly
　50 thrust bearing
　51 external thread part
　52 nut
　53 circular wheel friction plate
　54 for tilt Friction plate
　55 Telescopic friction plate
　56 fixing pin
　57 fixing pin
　58 sleeve
　59 flange portion
　60 collar
　61 coil spring
　62 driven side stopper surface
　63 tip butt portion
　64 tip distal portion
　65 inclined sliding contact portion
　66 inclined recess portion
　notch portion
　68 stopper surface
　69 engaging
　convex portion 70 driving side stopper surface
The scope of the claims

[Claim 1]
　A cam device
　comprising a driving side cam rotatably supported and a driven side cam supported so as to be nonrotatable, wherein the driving side cam is provided on one side surface in the axial direction thereof, and the driving side reference surface , A plurality of driving side protruding portions protruding from a plurality of positions in the circumferential direction of the driving side reference surface toward one side in the axial direction and a plurality of driving side guides provided on one side surface in the circumferential direction of the driving side protruding portion and a slope, a drive side cam surface,
　the driven cam is provided on the other axial side, the axial direction and the driven-side reference surface, a circumferential plurality of positions of the driven-side reference surface a plurality of driven-side protrusion protruding to the other side, and a plurality of driven side guide slope provided on the circumferentially other side surface of the driven-side convex portion, provided with a driven cam surface,
　wherein The driving side cam is rotatable relative to the driven side cam, and the driving side convex portion and the driven side convex portion And an unlocked state in which the axial dimension of the cam device is reduced and a distal end surface of the driving side protruding portion and a distal end surface of the driven side protruding portion are abutted against each other, a locked state of an enlarged axial dimension of the cam device, wherein said drive-side guide slope has a switchable via a state in which sliding contact with the driven side guide slope,
　the said drive-side protrusions A tip end abutting portion is provided on an outer diameter side portion of a tip end face of one of the convex portion on the driven side and the driven side convex portion and a shaft abutting portion is provided on the inner diameter side portion of the one convex portion, And a distal end recessed in a direction is provided
.
[Claim 2]
　An inclined sliding contact portion is provided on an inner diameter side portion of one of the driving side guide inclined surface and the driven side guide inclined surface, and on the outer diameter side portion of the one guide inclined surface, 2. The cam device according to claim 1, wherein an inclined recessed portion that is recessed in the axial direction than the sliding contact portion is provided, and the tip butt portion is provided radially outward of the slant sliding contact portion.
[Claim 3]
　The cam device according to claim 2, wherein the inclined sliding contact portion and the tip butt portion are provided in a continuous state.
[Claim 4]
　In the circumferential direction at least one location position of the outer peripheral edge portion of the one cam, the partial phase in the circumferential direction comprises the inclined recesses, notches are provided recessed radially inward,
　wherein the drive At least one position in the circumferential direction of the outer diameter side portion of the cam face of the other one of the side cam and the driven side cam, the phase with respect to the circumferential direction is the same as the driving side convex portion and the driven side convex A stopper protrusion is provided in a portion protruding in the axial direction in a portion aligned with the other protrusion of the stopper protrusion and the stopper protrusion in the
　locked state, of by the circumferential other side abuts, the driving-side cam, to rotate further in the locking direction is the rotational direction of the drive side cam when switching to the locked state is prevented,
claims The power stated in any one of 2 to 4 Apparatus.
[Claim 5]
　A pivotally displaceable about a tilt shaft arranged in the width direction, for supporting the steering shaft to which a steering wheel is fixed to the inside, and the steering column,
　provided in an axially intermediate portion of the steering column displacement A bracket;
　a support bracket having a pair of support plate portions for clamping the displacement bracket, the support bracket being supported by a vehicle body; and a
　pair of support brackets supported by the vehicle body , pair and the tilt long holes of which are provided,
　in a portion aligned with a portion of the tilt long holes of the pair among the displacement bracket, a through hole formed in a state of penetrating in the width direction,
　the A tilt elongated hole and a rod member inserted through the through hole in the width direction, and
　one end portion of the rod member projecting from the outer surface of one of the pair of support plate portions In part A pressing portion which is kicked,
　and the rod-shaped anchor portion provided in the other of the protruding portion from the outer surface of the support plate portion of the support plate portion of the pair at the other end portion of the member,
　said anchor portion And a cam device for expanding and contracting a space between the cam portion and the pressing portion,
　wherein the cam device is constituted by the cam device according to any one of claims 1 to 4, the driven side cam functions as the pressing portion, The driving side cam is supported on one end portion of the rod shaped member so as to be rotatable around the rod shaped member and suppressed in displacement to one end side of the rod shaped member ,
A position adjusting device for a steering wheel.
[Claim 6]
　A thrust is provided between the member which rotates in synchronism with the driving side cam or the driving side cam around the rod member and a member which does not rotate and is provided at a position opposed to the axial direction of the rod- 6. A device for adjusting the position of a steering wheel according to claim 5, wherein a bearing is provided.
Drawing

[ Figure 1]

[Figure 2]

[Figure 3]

[Fig. 4]

[Fig. 5]

[Fig. 6]

[Figure 7]

[Fig. 8]

[Figure 9]

[Fig. 10]

[Fig. 11]

[Fig. 12]