Invention name: Pad spring and disc brake
Technical field
[0001]
　The present invention relates to a pad spring for a disc brake and a disc brake that apply a braking force to a vehicle such as a four-wheeled vehicle.
Background technology
[0002]
　Generally, a disc brake provided in a vehicle such as an automobile is attached to a mounting member having a pair of arms that are attached to a non-rotating portion of the vehicle and straddle the outer peripheral side of the disc rotor in the axial direction, and each arm portion of the mounting member. A caliper that is slidably provided and presses a pair of friction pads on both sides of the disc rotor, and a pad that is attached to each arm side of the mounting member and elastically supports the pair of friction pads between the arms. It is composed of a spring or the like (see, for example, Patent Document 1).
[0003]
　Here, the pad spring elastically supports the friction pads on the inner side and the outer side, and smoothes the displacement of these friction pads in the disk axial direction. Therefore, the pad spring may be coated with a resin on the contact portion with the friction pad so as to improve the slidability of the friction pad. Further, the pad spring is provided with a locking portion that is locked to the disc path portion of the arm portion from the inside in the radial direction and attached to the mounting member. As a result, the pad spring is positioned in the disc axial direction with respect to the arm portion of the mounting member. The resin coating may also be formed on the locking portion.
Prior art literature
Patent documents
[0004]
Patent Document 1: Japanese Unexamined Patent Publication No. 2017-150589
Outline of the invention
Problems to be solved by the invention
[0005]
　By the way, in Patent Document 1 described above, when the caliper is assembled to a vehicle, a clearance inspection is performed at the time of shipment of the caliper for the purpose of avoiding interference with parts on the vehicle side, and the caliper fits in the space to be protected. I try to check if it is. As this clearance inspection, there is a method of confirming contact by electrically checking the presence or absence of a short circuit between the caliper and the jig while the caliper is mounted on a jig that imitates the shape of parts around the caliper such as the disc rotor.
[0006]
　When performing such a clearance inspection, the disc rotor-equivalent jig portion of the jig imitating the shape of the parts around the caliper and the locking portion of the pad spring are in close proximity to each other, and there is no contact between the two. Is electrically detected. However, since the locking portion of the pad spring is coated with a resin, even if contact occurs between the locking portion and the jig portion corresponding to the disc rotor due to a defect, for example, the resin coating is insulated. Depending on the sex, an electrical short circuit may not occur. That is, since the insulating resin coating is interposed between the locking portion and the jig portion corresponding to the disc rotor, even if the desired clearance is not secured between the two, the clearance inspection is passed. Therefore, there is a possibility that a wrong judgment will be made.
Means to solve problems
[0007]
　An object of the present invention is to provide a pad spring and a disc brake capable of accurately performing a clearance inspection performed at the time of shipment and improving workability at the time of inspection.
[0008]
　One embodiment of the present invention is a pad spring mounted on a disc brake, comprising a locking portion that is locked to a mounting member mounted on a non-rotating portion of the vehicle, wherein the locking portion is attached to a disc rotor. At least a part of the coating film in the facing region is thinner than the coating film in the other regions.
[0009]
　Further, one embodiment of the present invention is a pad spring mounted on a disc brake, which includes a locking portion that is locked to a mounting member mounted on a non-rotating portion of the vehicle, and the locking portion is a disc. It has a protrusion that protrudes in the direction close to the rotor.
[0010]
　On the other hand, the disc brake according to the embodiment of the present invention has a mounting member mounted on a non-rotating portion of the vehicle and formed straddling the outer peripheral side of the disc rotor, and a pair of friction pads pressed on both sides of the disc rotor. And a pad spring that is attached to the mounting member and elastically supports each of the friction pads. The pad spring engages the pad spring in a portion of the mounting member that straddles the outer peripheral side of the disc rotor. The locking portion has a structure in which at least a part of the coating film in the region facing the disc rotor is thinner than the coating film in the other regions.
[0011]
　Further, the disc brake according to the embodiment of the present invention is a mounting member mounted on a non-rotating portion of the vehicle and formed so as to straddle the outer peripheral side of the disc rotor, and a pair of friction pads pressed on both sides of the disc rotor. And a pad spring that is attached to the mounting member and elastically supports each of the friction pads. The pad spring engages the pad spring in a portion of the mounting member that straddles the outer peripheral side of the disc rotor. It has a locking portion for the purpose, and the locking portion is formed with a protruding portion protruding in a direction close to the disc rotor.
[0012]
　According to one embodiment of the present invention, the locking portion of the pad spring is, for example, a resin coating because the coating film in at least a part of the region facing the disc rotor is thinner than the coating film in the other regions. Since the insulation resistance value is lowered, it is possible to secure an electric short circuit with the jig portion corresponding to the disc rotor when performing the clearance inspection, and it is possible to improve the accuracy of the clearance inspection.
[0013]
　Further, by providing a protruding portion protruding in the direction close to the disc rotor in the locking portion of the pad spring, this protruding portion can be set as a portion where the clearance on the outer side in the disc radial direction is closest to the disc rotor. It is possible to improve the inspection accuracy by performing a clearance inspection by an electric short circuit at the contact site.
A brief description of the drawing
[0014]
FIG. 1 is a plan view of a disc brake according to the first embodiment of the present invention as viewed from above.
FIG. 2 is a front view of a partially broken disc brake as viewed from the direction of arrow II-II in FIG.
FIG. 3 is an enlarged partial cross-sectional view showing a mounting member, a friction pad, and a pad spring with the caliper in FIG. 2 removed.
FIG. 4 is a front view showing the pad spring in FIG. 3 as a single body.
5 is a left side view of the pad spring of FIG. 4 as viewed from the left side.
6 is a plan view of a partially broken pad spring of FIG. 4 as viewed from above.
FIG. 7 is an enlarged view of a main part of the pad spring of FIG. 6 showing an enlarged part of a locking plate portion.
FIG. 8 is a cross-sectional view of a main part of the protrusion provided on the locking plate portion as viewed from the direction of arrow VIII-VIII in FIG.
FIG. 9 is an explanatory diagram showing a working state in which a resin coating is applied to a pad spring.
FIG. 10 is a partial cross-sectional view showing resin coatings having different film thicknesses formed on the locking plate portion of the pad spring.
[Fig. 11] Fig. 11 is an enlarged view of a main part shown by enlarging a part of the locking plate portion adopted in the second embodiment.
FIG. 12 is a cross-sectional view of a main part of the protrusion provided on the locking plate portion as viewed from the direction of arrow XII-XII in FIG.
FIG. 13 is a partial cross-sectional view showing resin coatings having different film thicknesses formed on a locking plate portion of a pad spring.
FIG. 14 is a partial cross-sectional view showing resin coatings having different film thicknesses formed on the locking plate portion of the pad spring according to the third embodiment.
[Fig. 15] Fig. 15 is an enlarged view of a main part shown by enlarging a part of the locking plate portion adopted in the fourth embodiment.
FIG. 16 is a cross-sectional view of a main part of the protrusion provided on the locking plate portion as viewed from the direction of arrow XVI-XVI in FIG.
FIG. 17 is an enlarged view of a main part showing a part of a locking plate portion according to the first modification.
FIG. 18 is an enlarged view of a main part showing a part of a locking plate portion according to a second modification.
Mode for carrying out the invention
[0015]
　Hereinafter, the pad spring and the disc brake according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 18 of the accompanying drawings.
[0016]
　Here, FIGS. 1 to 10 show the first embodiment. In FIG. 1, for example, the disc rotor 1 rotates in the direction of arrow A in FIG. 1 together with wheels (not shown) when the vehicle travels in the forward direction, and is opposite to the direction of arrow A when the vehicle moves backward. It rotates in the direction (direction B).
[0017]
　The mounting member 2 is a carrier that is mounted on a non-rotating portion (not shown) of the vehicle. As shown in FIGS. 1 and 2, the mounting member 2 is separated from the disc rotor 1 in the rotational direction (hereinafter referred to as the disk circumferential direction) and straddles the outer periphery of the disc rotor 1 in the axial direction (hereinafter referred to as disc rotor 1). , A pair of arm portions 2A, 2A extending in the direction of the disc axis) and the base end side of each arm portion 2A are connected so as to be integrated, and the position is the inner side of the disc rotor 1. It is configured to include a thick bearing portion 2B and the like fixed to a non-rotating portion of the vehicle.
[0018]
　Further, in the mounting member 2, a reinforcing beam 2C that connects the tip ends of the arm portions 2A to each other at a position on the outer side of the disc rotor 1 is integrally formed in a bow shape as shown in FIG. .. As a result, each arm portion 2A of the mounting member 2 is integrally connected by the support portion 2B on the inner side of the disc rotor 1, and is integrally connected by the reinforcing beam 2C on the outer side.
[0019]
　As shown in FIGS. 2 and 3, each arm portion 2A of the mounting member 2 extends in an arc shape along the outer circumference (rotational locus) of the disc rotor 1 at a position at an axial intermediate portion of the disc rotor 1. The disc path portion 3 and the inner side and outer side pad guides 4 which are located on both sides of the disc pass portion 3 in the disk axial direction and which slidably support the friction pads 10 on the inner side and the outer side are formed. ing. Further, each arm portion 2A is provided with a pin hole 2D (only one is shown in FIGS. 2 and 3). A sliding pin 7, which will be described later, is slidably inserted into these pin holes 2D.
[0020]
　As shown in FIGS. 2 and 3, the pad guide 4 of each arm portion 2A is formed as a concave groove having a U-shaped cross section, and extends in the direction in which the friction pad 10 described later is slidably displaced, that is, in the disk axial direction. .. The pad guide 4 is unevenly fitted to the selvage portions 11A and 11B so as to sandwich the selvage portions 11A and 11B of the friction pad 10 described later from the upper and lower directions (disk radial direction).
[0021]
　As a result, each pad guide 4 guides the friction pad 10 in the disk axial direction via the selvages 11A and 11B. The back side wall surface of the pad guide 4 formed of the concave groove constitutes a torque receiving surface 5 (see FIG. 2) as a so-called torque receiving portion. The torque receiving surface 5 receives the braking torque generated during the braking operation from the friction pad 10 via the ear portions 11A and 11B.
[0022]
　That is, of the left and right pad guides 4 and 4 shown in FIG. 2, the left pad guide 4 located on the rotation direction outlet side (hereinafter referred to as the rotation side) of the disc rotor 1 rotating in the arrow A direction. In particular, the torque receiving surface 5 on the bottom side receives the braking torque that the friction pad 10 receives from the disc rotor 1 during the braking operation via the ear portion 11B of the back plate 11 and the guide plate portion 17 of the pad spring 13 described later. I accept.
[0023]
　The caliper 6 is slidably provided on the mounting member 2 via a pair of sliding pins 7 and the like. As shown in FIG. 1, the caliper 6 straddles the outer peripheral side of the disc rotor 1 between the inner leg portion 6A provided on the inner side, which is one side of the disc rotor 1, and each arm portion 2A of the mounting member 2. The bridge portion 6B extending from the inner leg portion 6A to the outer side which is the other side of the disc rotor 1 and the outer side which is the tip side of the bridge portion 6B extend inward in the disc radial direction, and the tip side is bifurcated. It is composed of an outer leg portion 6C as a shaped claw portion.
[0024]
　A cylinder (none of which is shown) into which the piston is slidably inserted is formed in the inner leg portion 6A of the caliper 6. Further, the inner leg portion 6A is provided with a pair of mounting portions 6D protruding in the left and right directions in FIG. 1. Each of the mounting portions 6D slidably supports the entire caliper 6 to each arm portion 2A of the mounting member 2 via a sliding pin 7.
[0025]
　As shown in FIG. 1, the sliding pin 7 is fastened to each mounting portion 6D of the caliper 6 by using a bolt 8. The tip end side of each sliding pin 7 extends toward the pin hole 2D of each arm portion 2A of the mounting member 2, and can slide into each pin hole 2D of the mounting member 2 as illustrated in FIG. It is inserted in. As shown in FIG. 1, protective boots 9 are attached between each arm portion 2A and each sliding pin 7. The protective boot 9 prevents rainwater or the like from entering between the sliding pin 7 and the pin hole 2D of the arm portion 2A.
[0026]
　The friction pad 10 on the inner side and the friction pad 10 on the outer side are arranged so as to face both sides of the disc rotor 1. As shown in FIGS. 2 and 3, for example, each friction pad 10 is formed on a flat plate-shaped back plate 11 extending in a substantially fan shape in the circumferential direction (rotational direction) of the disc rotor 1 and on the surface side of the back plate 11. It is composed of a lining 12 or the like as a friction material which is fixedly provided and frictionally contacts the surface of the disc rotor 1.
[0027]
　The back plate 11 of the friction pad 10 is provided with ear portions 11A and 11B as fitting portions having a convex shape on the side surface portions located on both sides in the circumferential direction of the disc rotor 1. The ear portions 11A and 11B of the back plate 11 constitute a torque transmission portion that abuts and transmits the braking torque received by the friction pad 10 from the disc rotor 1 to the torque receiving surface 5 of the mounting member 2 when the vehicle brakes are operated. be.
[0028]
　The selvage portions 11A and 11B of the friction pad 10 (back plate 11) are formed symmetrically on the left and right, for example, as shown in FIG. 2, and have the same shape as each other. Then, one selvage portion 11A is arranged on the rotation direction inlet side (entry side) of the disc rotor 1 that rotates in the direction of arrow A when the vehicle moves forward, and the other selvagement portion 11B is in the rotation direction of the disc rotor 1. It is located on the exit side (rotation side).
[0029]
　A pair of pad springs 13, 13 are attached to each arm portion 2A of the attachment member 2. Each of the pad springs 13 elastically supports the friction pads 10 on the inner side and the outer side, respectively, and smoothes the sliding displacement of these friction pads 10 in the disk axial direction. Each pad spring 13 is formed by bending (press forming) a stainless steel plate or the like having a spring property as shown in FIGS. 4 to 6.
[0030]
　The pad spring 13 includes a connecting plate portion 14, a flat plate portion 15, a locking plate portion 16, a guide plate portion 17, and a radial urging portion 18, which will be described later. In the following description, the terms "upper", "upper surface", or "upward" mean the radial outer side, the radial outer surface, or the radial outer direction of the disc rotor 1 with respect to each part of the pad spring 13. The terms "lower", "lower surface" or "downward" are used to mean the radially inner, radial inner surface or radial inward of the disc rotor 1.
[0031]
　The connecting plate portion 14 of the pad spring 13 connects the pair of flat plate portions 15 of the pad spring 13 together with the guide plate portions 17, that is, the guide plate portions 17 are connected to the inner side and the outer side of the disc rotor 1. Since they are integrally connected with each other, they are formed so as to extend in the axial direction while straddling the outer peripheral side of the disc rotor 1. A pair of flat plate portions 15 extend inward in the radial direction of the disc rotor 1 and are integrally formed on both ends of the connecting plate portion 14 in the length direction.
[0032]
　The locking plate portion 16 as the locking portion is located between the pair of flat plate portions 15 and is integrally formed with the connecting plate portion 14. The locking plate portion 16 (that is, the locking portion) is attached to each arm portion 2A of the mounting member 2 so as to be locked to the disc path portion 3 of the arm portion 2A from the inside in the radial direction. As a result, the pad spring 13 is positioned in the disc axial direction with respect to the arm portion 2A of the mounting member 2. The locking plate portion 16 is a plate-shaped locking portion that engages the pad spring 13 with the disc path portion 3 (that is, the portion straddling the outer peripheral side of the disc rotor 1) of the arm portion 2A of the mounting member 2.
[0033]
　The pair of guide plate portions 17 are provided on both end sides of the connecting plate portion 14 via the flat plate portions 15. Each guide plate portion 17 is formed by being bent in a substantially U shape from the lower end (tip side) of the flat plate portion 15. One of the guide plate portions 17 of the pair of guide plate portions 17 is fitted and mounted in the pad guide 4 on the inner side, and the other guide plate portion 17 is fitted and mounted in the pad guide 4 on the outer side. Can be installed.
[0034]
　Each guide plate portion 17 is formed between the upper surface plate 17A and the lower surface plate 17B arranged to face the upper and lower wall surfaces of the pad guide 4 and the upper surface plate 17A and the lower surface plate 17B in the radial direction of the disc rotor 1. A guide bottom plate 17C that is connected and extends in the disc axial direction in a flat surface shape and is in contact with the back side wall surface (that is, the torque receiving surface 5) of the pad guide 4, and the outside of the guide bottom plate 17C in the disc axial direction. It is configured to include an axial extension portion 17D which is extended toward the direction of the disk rotor 1 and whose tip end side is obliquely inclined outward in the circumferential direction of the disc rotor 1.
[0035]
　Further, the upper surface plate 17A of the guide plate portion 17 protrudes toward the outside in the disc axial direction, and the tip end (protruding end) side is inclined diagonally toward the upper side in FIG. 5 (that is, the radial outside of the disc rotor 1). The insertion guide portion 17E is integrally formed. When the selvages 11A and 11B of the friction pad 10 are inserted between the upper surface plate 17A and the lower surface plate 17B of the guide plate 17, the insertion guide portion 17E is provided with the selvage portion 11A together with the axial extension portion 17D. , 11B are provided to smoothly guide the inside of the guide plate portion 17.
[0036]
　A pair of radial urging portions 18 for urging the selvage portions 11A and 11B of each friction pad 10 toward the radial outer side (that is, the upper side in FIG. 5) of the disc rotor 1 is below each guide plate portion 17. It is provided so as to extend from the face plate 17B. Here, the radial urging portion 18 has a first extending portion 18A extending outward in the disk axial direction from the lower surface plate 17B of the guide plate portion 17, and a substantially C-shaped tip side of the first extending portion 18A. The curl portion 18B formed by folding back in a shape or a substantially U shape, extends from the curl portion 18B in a direction approaching the disc rotor 1 and is inclined diagonally upward (that is, outward in the radial direction of the disc rotor 1). It is configured to include a second extending portion 18C to which the ear portions 11A and 11B of the friction pad 10 abut.
[0037]
　When the selvage portions 11A and 11B of the friction pad 10 are inserted between the upper surface plate 17A and the lower surface plate 17B of the guide plate portion 17, the radial urging portion 18 is shown by a two-dot chain line in FIG. It flexes and deforms elastically in the direction of arrow C. That is, the radial urging portion 18 is elastically deformed so that the second extending portion 18C is sandwiched between the selvage portions 11A and 11B of the friction pad 10 and the lower surface plate 17B. In this state, the second extending portion 18C of the radial urging portion 18 elastically urges the selvage portions 11A and 11B of the friction pad 10 (back plate 11) toward the radial outer side of the disc rotor 1. The friction pad 10 prevents the friction pad 10 from rattling with respect to the mounting member 2 in the disc radial direction.
[0038]
　As shown in FIGS. 5 to 8, the locking plate portion 16 (that is, the locking portion) of the pad spring 13 is integrally formed with a protruding portion 19 projecting in a direction close to the disc rotor 1. Two of the protruding portions 19 are formed in the locking plate portion 16 of the pad spring 13 at positions on the extension plane in the outer peripheral direction of the disc rotor 1. In other words, two projecting portions 19 are provided, for example, at positions of the locking plate portion 16 of the pad spring 13 facing the disc rotor 1 on the radial outer side of the disc rotor 1. The number of protruding portions 19 may be one or three or more.
[0039]
　As shown in FIG. 8, for example, the protrusion 19 is formed as a protrusion having an arc-shaped cross section, a U-shape, or a U-shape, and the bottom surface of the protrusion is a rotational locus of the disc rotor 1 (shown by a two-dot chain line in FIG. 8). ) Protruding in the direction close to). Further, as shown in FIG. 10, a resin coating 20 made of, for example, an insulating paint is applied to the bottom surface (projection surface) of the protrusion 19, and the coating film 20A thereof is larger than the coating film 20B in other regions. It has a thin film thickness. In other words, in the locking plate portion 16, the coating film 20A of at least a part (that is, the protruding portion 19) of the region facing the disc rotor 1 is thinner than the coating film thickness of the other regions.
[0040]
　Here, the coating apparatus 21 shown in FIG. 9 sprays, for example, an insulating paint from the nozzle 21A toward the pad spring 13. As a result, the guide plate portion 17 and the like of the pad spring 13 are coated with a resin coating 20 made of an insulating paint on the surface side thereof. The resin coating 20 is formed not only on the contact portion (guide plate portion 17) of the pad spring 13 with the friction pad 10, but also on the surface of the locking plate portion 16 (region facing the outer peripheral surface which is the rotor surface of the disc rotor 1). ) Is also applied all at once.
[0041]
　That is, the spraying of the paint by the painting device 21 needs to form a uniform coating film over a wide spray range in order to improve workability, and is not limited to the guide plate portion 17 of the pad spring 13 but to the locking plate portion 16. Also, a coating film (for example, resin coating 20) is formed. In this case, it is possible to prevent the coating film from adhering by covering the surface of the locking plate portion 16 with a shielding mask or the like. However, in this case, extra time is spent for attaching and detaching the mask, and workability is deteriorated. Therefore, as shown in FIG. 9, for example, the painting operation by the painting device 21 is performed not only on the guide plate portion 17 of the pad spring 13 but also on the locking plate portion 16 all at once.
[0042]
　As a result, as shown in FIG. 10, a resin coating 20 is formed on the locking plate portion 16 of the pad spring 13 on the surface side thereof (the surface of the region facing the outer peripheral surface of the disc rotor 1). However, the coating film formed on the surface of the locking plate portion 16 flows downward due to its own weight before the paint solidifies. Therefore, the coating film 20A formed on the bottom surface (projection surface) of the protruding portion 19 has a thinner film thickness than the coating film 20B in other regions. In particular, when the paint is dried, the pad spring 13 is arranged so that the bottom surface (projection surface) of the protrusion 19 is in the upper position and the other region is in the lower position, thereby coating the protrusion 19. The film thickness 20A is thinner than that of the coating film 20B in other regions.
[0043]
　As a result, the coating film 20A formed on the bottom surface (projection surface) of the protrusion 19 has a lower insulation resistance value than the coating film 20B in other regions, and the electrical conduction (conductivity) can be relatively increased. .. Therefore, when performing the clearance inspection described later, it is possible to secure an electrical short circuit between the bottom surface of the protruding portion 19 and the jig portion corresponding to the disc rotor (not shown), and it is possible to improve the accuracy of the clearance inspection. ..
[0044]
　Even when the resin coating 20 is not applied to the bottom surface (projection surface) of the protrusion 19, the locking plate portion 16 (locking portion) of the pad spring 13 protrudes in a direction close to the disc rotor 1. It is preferable to provide the protrusion 19. In this case, the protruding portion 19 can be a portion where the clearance on the outer side in the radial direction is the smallest and close to the rotor surface (outer peripheral surface) of the disc rotor 1, and a clearance inspection due to an electric short circuit is performed at this closest portion. By doing so, it becomes possible to improve the accuracy of the inspection.
[0045]
　The disc brake and the pad spring 13 according to the first embodiment have the above-described configuration, and the operation thereof will be described next.
[0046]
　First, when the vehicle is braked, the piston is slidably displaced toward the disc rotor 1 by supplying brake fluid pressure to the inner leg portion 6A (cylinder) of the caliper 6, thereby causing the friction pad 10 on the inner side. Is pressed against one side surface of the disc rotor 1. At this time, since the caliper 6 receives the pressing reaction force from the disc rotor 1, the entire caliper 6 is slidably displaced toward the inner side with respect to the arm portion 2A of the mounting member 2, and the outer leg portion 6C is rubbed on the outer side. The pad 10 is pressed against the other side surface of the disc rotor 1.
[0047]
　As a result, the friction pads 10 on the inner side and the outer side can, for example, move the disc rotor 1 rotating in the direction of arrow A (when the vehicle is moving forward) in FIGS. 1 and 2 from both sides in the axial direction between the two. It can be strongly pinched and a braking force can be applied to the disc rotor 1. When the brake operation is released, the hydraulic pressure supply to the piston is stopped, so that the friction pad 10 on the inner side and the outer side is separated from the disc rotor 1 and returns to the non-braking state again.
[0048]
　By the way, on the pad spring 13, the friction pads 10 (ear portions 11A, 11B of the back plate 11) can be smoothly slidably displaced with respect to the arm portions 2A (pad guides 4) of the mounting member 2. It is known that the resin coating 20 is applied to the contact portion with the). That is, the spray of the paint (resin coating 20) by the coating device 21 shown in FIG. 9 is applied not only to the guide plate portion 17 of the pad spring 13 but also to the locking plate portion 16 all at once in order to improve workability. ..
[0049]
　Further, when assembling a disc brake (for example, a mounting member 2 and a caliper 6) to a vehicle, a clearance inspection is performed at the time of shipment of the brake in order to avoid interference with parts on the vehicle side, for example, the caliper 6 or the like is used. I try to check if it fits in the space to be protected. In this clearance inspection, for example, the pad spring 13 is carried out in a state where the mounting member 2 and the pad spring 13 are mounted on a jig (that is, a jig portion corresponding to the disc rotor) that imitates the shape of parts around the caliper such as the disc rotor 1. It is confirmed whether or not the disc rotor and the jig portion corresponding to the disc rotor are in contact with each other by checking whether or not an electrical short circuit has occurred between the two.
[0050]
　When such a clearance inspection is performed, the locking plate portion 16 of the pad spring 13 is in a state of being close to the disc rotor equivalent jig portion (for example, the rotation locus of the disc rotor 1 shown in FIGS. 3 and 4). , The presence or absence of contact between the two is electrically detected. However, since the locking plate portion 16 of the pad spring 13 is coated with the resin coating 20, for example, even if the disc rotor equivalent jig portion and the locking plate portion 16 come into contact with each other due to a defect, the resin coating 20 is applied. Insulation may not cause an electrical short circuit. That is, even if the desired clearance is not secured between the two, the clearance inspection may pass and an erroneous judgment may be made.
[0051]
　Therefore, according to the first embodiment, the locking plate portion 16 of the pad spring 13 is integrally formed with a protruding portion 19 projecting in a direction close to the disc rotor 1. On this, a resin coating 20 is formed on the surface side of the locking plate portion 16 (the surface of the region facing the outer peripheral surface of the disc rotor 1). Since the coating film formed on the surface of the locking plate portion 16 flows downward due to its own weight before the paint solidifies, the coating film 20A formed on the bottom surface (projection surface) of the protrusion 19 is formed. The film thickness is thinner than that of the coating film 20B in other regions.
[0052]
　As a result, the coating film 20A formed on the bottom surface (projection surface) of the protrusion 19 has a lower insulation resistance value than the coating film 20B in other regions, and the electrical conduction (conductivity) can be relatively increased. .. Therefore, when the above-mentioned clearance inspection is performed, the electrical short-circuit property between the bottom surface of the protruding portion 19 and the jig portion corresponding to the disc rotor can be ensured, and the accuracy of the clearance inspection can be improved.
[0053]
　Therefore, according to the first embodiment, of the resin coating 20 formed on the locking plate portion 16 of the pad spring 13, the coating film 20A of the protruding portion 19 is larger than the coating film 20B of the other portion (region). It is designed to be thin. Therefore, the protruding portion 19 of the locking plate portion 16 is provided with a thin coating film 20A so as to ensure an electric short circuit with the disc rotor equivalent jig portion during the clearance inspection. For example, the presence or absence of contact of the locking plate portion 16 with respect to the rotation locus of the disc rotor 1 shown in FIGS. 3 and 4 can be electrically detected without error, and the accuracy of the clearance inspection can be improved.
[0054]
　Further, even if the pad spring 13 does not form the resin coating 20 on the locking plate portion 16, the following effects can be obtained. That is, by providing the locking plate portion 16 of the pad spring 13 with a protruding portion 19 projecting in a direction close to the disc rotor 1, the clearance in the outer diameter direction of the disc rotor 1 is closest to the protruding portion 19. It can be a site, and it is possible to perform a clearance inspection by electrical short circuit at this closest site, and it is possible to improve the inspection accuracy.
[0055]
　Next, FIGS. 11 to 13 show a second embodiment. In the present embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted. However, a feature of the second embodiment is that a U-shaped notch 30 is formed in the locking plate portion 16 of the pad spring 13, and the end portion (free end) of the notch 30 is used as the disc rotor 1. By bending in a direction close to the above, a protruding portion 31 protruding from the lower surface of the locking plate portion 16 (downward in FIG. 4) is provided.
[0056]
　Here, the protruding portion 31 is located at a position on the outer peripheral direction extension plane of the disc rotor 1 in the locking plate portion 16 of the pad spring 13, similarly to the protruding portion 19 described in the first embodiment. Individually formed. In other words, two projecting portions 31 are provided, for example, at positions of the locking plate portion 16 of the pad spring 13 facing the disc rotor 1 on the radial outer side of the disc rotor 1. The number of protruding portions 19 may be one or three or more.
[0057]
　Further, as shown in FIG. 13, the locking plate portion 16 of the pad spring 13 is coated with a resin coating 32 made of, for example, an insulating paint. However, the coating film 32A formed at the tip (free end) of the protrusion 31 flows downward due to its own weight before the paint solidifies, so that the film thickness is thinner than that of the coating film 32B in other regions. In other words, in the locking plate portion 16, the coating film 32A of at least a part (that is, the protruding portion 31) of the region facing the disc rotor 1 is thinner than the coating film thickness of the other regions.
[0058]
　Thus, even in the second embodiment configured as described above, the locking plate portion 16 of the pad spring 13 is provided with a protruding portion 31 protruding in a direction close to the disc rotor 1, and the tip of the protruding portion 31 (free). By forming a coating film 32A thinner than the coating film thickness of the other regions on the edge), the same effect as that of the first embodiment can be obtained.
[0059]
　In particular, in the second embodiment, a U-shaped notch 30 is formed in the locking plate portion 16 of the pad spring 13, and the end portion (free end) of the notch 30 is in a direction close to the disc rotor 1. The protrusion 31 is provided so as to protrude (downward in FIG. 4) from the lower surface of the locking plate portion 16 by bending the plate portion 16. Therefore, the amount of protrusion of the protrusion 31 facing the rotor surface (outer peripheral surface) of the disc rotor 1 can be adjusted by the degree of bending of the notch 30, and the protrusion 31 of the locking plate portion 16 and the disc rotor 1 can be adjusted. Clearance can be easily secured.
[0060]
　Further, even in such a second embodiment, in the case of the pad spring 13 in which the resin coating 32 is not formed on the locking plate portion 16, the following effects are obtained. That is, by providing the locking plate portion 16 of the pad spring 13 with a protruding portion 31 projecting in a direction close to the disc rotor 1, the clearance of the protruding portion 31 in the outer diameter direction of the disc rotor 1 is closest to the protruding portion 31. It can be a site, and it is possible to perform a clearance inspection by electrical short circuit at this closest site, and it is possible to improve the inspection accuracy.
[0061]
　Next, FIG. 14 shows a third embodiment. In the present embodiment, the same components as those in the second embodiment described above are designated by the same reference numerals, and the description thereof will be omitted. However, the feature of the third embodiment is that the protruding portion 41 is formed by bending in the direction opposite to the protruding portion 31 described in the second embodiment.
[0062]
　That is, in the third embodiment, a U-shaped notch 40 is formed in the locking plate portion 16 of the pad spring 13 (in the direction opposite to the notch 30 described in the second embodiment). By bending the end portion (free end) of the notch 40 in a direction close to the disc rotor 1, a protruding portion 41 protruding from the lower surface of the locking plate portion 16 toward the disc rotor 1 is provided. ..
[0063]
　Further, as shown in FIG. 14, the locking plate portion 16 of the pad spring 13 is coated with a resin coating 42 made of, for example, an insulating paint. However, the coating film 42A formed at the tip (free end) of the protrusion 41 flows downward due to its own weight before the paint solidifies, so that the film thickness is thinner than that of the coating film 42B in other regions. In other words, in the locking plate portion 16, the coating film 42A of at least a part (that is, the protruding portion 41) of the region facing the disc rotor 1 is thinner than the coating film thickness of the other regions.
[0064]
　Thus, even in the third embodiment configured as described above, the locking plate portion 16 of the pad spring 13 is provided with a protruding portion 41 projecting in a direction close to the disc rotor 1, and the tip of the protruding portion 41 (free). By forming a coating film 42A thinner than the coating film thickness of the other region on the edge), the same effect as that of the second embodiment can be obtained.
[0065]
　Further, even in such a third embodiment, in the case of the pad spring 13 in which the resin coating 42 is not formed on the locking plate portion 16, the following effects are obtained. That is, by providing the locking plate portion 16 of the pad spring 13 with a protruding portion 41 projecting in a direction close to the disc rotor 1, the clearance of the protruding portion 41 in the outer diameter direction of the disc rotor 1 is closest to the protruding portion 41. It can be a site, and it is possible to perform a clearance inspection by electrical short circuit at this closest site, and it is possible to improve the inspection accuracy.
[0066]
　Next, FIGS. 15 and 16 show a fourth embodiment. In the present embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted. However, a feature of the fourth embodiment is that the locking plate portion 16 of the pad spring 13 is provided with a protruding portion 51 made of a substantially U-shaped protruding piece.
[0067]
　Here, the protruding portion 51 is formed by additionally providing a substantially U-shaped protruding piece on the tip end side of the locking plate portion 16 of the pad spring 13. The protruding portion 51 is formed as a protruding piece extending in the circumferential direction (rotational direction) of the disc rotor 1. The protruding portion 51 is formed so as to protrude (downward in FIG. 16) from the lower surface of the locking plate portion 16 by bending the end portion (free end) side thereof in a direction close to the disc rotor 1. There is. In other words, the protruding portion 51 is provided at a position of the locking plate portion 16 of the pad spring 13 facing the disc rotor 1 on the radial outer side of the disc rotor 1.
[0068]
　Further, the locking plate portion 16 of the pad spring 13 is coated with a resin coating (not shown) made of an insulating paint as described in the first embodiment. However, the coating film formed at the tip (free end) of the protrusion 51 flows downward due to its own weight before the paint solidifies, so that the film thickness is thinner than that of the coating film in other regions. In other words, in the locking plate portion 16, the coating film of at least a part (that is, the protruding portion 51) of the region facing the disc rotor 1 is thinner than the coating film thickness of the other regions.
[0069]
　Thus, even in the fourth embodiment configured as described above, the locking plate portion 16 of the pad spring 13 is provided with a protruding portion 51 projecting in a direction close to the disc rotor 1, and the tip of the protruding portion 51 (free). By forming a coating film thinner than the coating film thickness of the other regions on the edge), the same effect as that of the first embodiment can be obtained.
[0070]
　In the fourth embodiment, the case where the protruding portion 51 provided on the locking plate portion 16 of the pad spring 13 is formed as a protruding piece extending in the circumferential direction (rotational direction) of the disc rotor 1 is given as an example. explained. However, the present invention is not limited to this, and as in the first modification shown in FIG. 17, for example, it protrudes not by the circumferential direction (rotational direction) of the disc rotor but by a protruding piece protruding in the axial direction of the disc rotor. It may be configured to form the portion 61.
[0071]
　Further, as in the second modification shown in FIG. 18, the protrusion 71 may be formed. The protruding portions 61 and 71 according to such a modification also protrude from the lower surface of the locking plate portion 16 by bending each end (free end) side in a direction close to the disc rotor 1. Further, with respect to such protrusions 61 and 71, the coating film of at least a part of the region facing the disc rotor 1 (that is, the protrusions 61 and 71) becomes thinner than the coating film thickness of the other regions. There is.
[0072]
　Further, in each of the above embodiments, the pad spring 13 including the connecting plate portion 14, the flat plate portion 15, the locking plate portion 16, the guide plate portion 17, and the radial urging portion 18 will be described as an example. bottom. However, the pad spring adopted in the present invention is not limited to this, for example, if the pad spring has a locking portion for locking the pad spring in a portion straddling the outer peripheral side of the disc rotor of the mounting member. , It can be applied to any pad spring, and can be applied to any disc brake using such a pad spring.
[0073]
　Next, the invention included in the above embodiment will be described. That is, in the first aspect of the present invention, a pad spring mounted on a disc brake is provided with a locking portion that is locked to a mounting member mounted on a non-rotating portion of the vehicle, and the locking portion is The coating film in at least a part of the region facing the disc rotor is thinner than the coating film in the other regions.
[0074]
　A second aspect of the present invention is a pad spring mounted on a disc brake, provided with a locking portion that is locked to a mounting member mounted on a non-rotating portion of the vehicle, and the locking portion includes a locking portion. A protrusion is formed that protrudes in the direction close to the disc rotor. Further, in the pad spring according to the third aspect of the present invention, in the second aspect, the protruding portion is formed at a position on the extension plane in the outer peripheral direction of the disc rotor.
[0075]
　The disc brake according to the fourth aspect of the present invention includes a mounting member mounted on a non-rotating portion of the vehicle and formed straddling the outer peripheral side of the disc rotor, and a pair of friction pads pressed on both sides of the disc rotor. A pad spring that is attached to the mounting member and elastically supports each of the friction pads is provided, and the pad spring is for locking the pad spring to a portion of the mounting member that straddles the outer peripheral side of the disc rotor. The locking portion has a locking portion, and the coating film in at least a part of the region facing the disc rotor is thinner than the coating film thickness in the other regions.
[0076]
　The disc brake according to the fifth aspect of the present invention includes a mounting member mounted on a non-rotating portion of the vehicle and formed straddling the outer peripheral side of the disc rotor, and a pair of friction pads pressed on both sides of the disc rotor. A pad spring that is attached to the mounting member and elastically supports each of the friction pads is provided, and the pad spring is for locking the pad spring to a portion of the mounting member that straddles the outer peripheral side of the disc rotor. It has a locking portion, and the locking portion is formed with a protruding portion protruding in a direction close to the disc rotor. Further, in the disc brake according to the sixth aspect of the present invention, in the fifth aspect, the protruding portion is formed at a position on an extension plane in the outer peripheral direction of the rotor surface of the disc rotor.
[0077]
　The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.
[0078]
　This application claims priority based on Japanese Patent Application No. 2018-236336 filed on December 18, 2018. The entire disclosure, including the specification, claims, drawings, and abstract of Japanese Patent Application No. 2018-236336 filed December 18, 2018, is incorporated herein by reference in its entirety.
Code description
[0079]
　1 Disc rotor 2 Mounting member 2A Arm part 3 Disc path part 4 Pad guide 6 Caliper 10 Friction pad 13 Pad spring 14 Connecting plate part 16 Locking plate part (Locking part) 17 Guide plate part 18 Radial urging part 19, 31,41,51,61,71 Protruding parts 20, 32, 42 Resin coating 20A, 32A, 42A Coating film 20B, 32B, 42B Coating film in other regions
The scope of the claims
[Claim 1]
　A pad spring mounted on a disc brake,
　wherein the pad spring includes a locking portion that is locked to a mounting member mounted on a non-rotating portion of the vehicle, the locking portion
　being a region facing the disc rotor. Pad springs where at least some of the coating film is thinner than the coating film thickness in other areas.
[Claim 2]
　A pad spring mounted on a disc brake, the
　pad spring comprising a locking portion locked to a mounting member mounted on a non-rotating portion of the vehicle, the locking portion
　being close to the disc rotor. A pad spring with a protruding portion that protrudes in the direction.
[Claim 3]
　The pad spring according to claim 2,
　wherein the protruding portion is formed at a position on an extension plane in the outer peripheral direction of the disc rotor.
[Claim 4]
　The pad spring according to claim 2,
　wherein the coating film is formed on the locking portion, and
　the coating film thickness of the protruding portion is thinner than the coating film thickness of the other region.
[Claim 5]
　A disc brake, the disc brake includes
　a mounting member mounted on a non-rotating portion of the vehicle and formed straddling the outer peripheral side of the
　disc rotor, a pair of friction pads pressed on both sides of the disc rotor, and the
　above. A pad spring that is attached to the mounting member and elastically supports each of the friction pads is provided,
　and the pad spring is engaged in engaging the pad spring with a portion of the mounting member that straddles the outer peripheral side of the disc rotor. The locking portion is
　a disc brake having a stop, wherein at least a part of the coating film in the region facing the disc rotor is thinner than the coating film in the other regions.
[Claim 6]
　A disc brake, the disc brake includes
　a mounting member mounted on a non-rotating portion of the vehicle and formed straddling the outer peripheral side of the
　disc rotor, a pair of friction pads pressed on both sides of the disc rotor, and the
　above. A pad spring that is attached to the mounting member and elastically supports each of the friction pads is provided,
　and the pad spring is engaged in engaging the pad spring with a portion of the mounting member that straddles the outer peripheral side of the disc rotor. A
　disc brake having a stop portion, the locking portion having a protruding portion protruding in a direction close to the disc rotor.
[Claim 7]
　The disc brake according to claim 5,
　wherein the protruding portion is formed at a position on an extension plane in the outer peripheral direction of the rotor surface of the disc rotor.
[Claim 8]
　The disc brake according to claim 5,
wherein the coating film is formed on the locking portion, and
the coating film thickness of the protruding portion is thinner than the coating film thickness of the other region.