[0001]The present invention relates to a working machine such as a backhoe.
Background technology
[0002]
　Conventionally, a working machine disclosed in Patent Document 1 is known.
　The working machine disclosed in Patent Document 1 has a support bracket at the front portion of the machine body. The support bracket has a boom pivot at the top and a cylinder pivot at the front and bottom. A boom is pivotally supported at the boom pivot. A cylinder tube of a boom cylinder that drives a boom is pivotally supported at the cylinder pivot portion via a cylinder shaft. The piston rod of the boom cylinder is pivotally connected to the middle part of the boom. When the boom cylinder is expanded and contracted, the boom swings up and down and the boom cylinder also swings up and down. The hydraulic hose connected to the boom cylinder passes through the support bracket from the rear side to the front side of the support bracket and is arranged. The support bracket has a through hole on the side of the cylinder pivot for inserting a hydraulic hose. The clamp that holds the hydraulic hose to the support bracket is located near the rear of the cylinder shaft.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Patent No. 4004041
Outline of the invention
Problems to be solved by the invention
[0004]
　By the way, a clamp for holding the hydraulic hose is also provided on the boom cylinder side. The hydraulic hose bends (slacks) when the boom is swung up and down from the dead point position where the cylinder shaft, the clamp on the support bracket side, and the clamp on the cylinder side are lined up in a straight line.
　In a conventional working machine, the clamp on the support bracket side is placed near the cylinder shaft, so the clamp on the cylinder side must be placed away from the cylinder shaft in order to take the deflection allowance of the hydraulic hose. .. Then, when the boom is swung upward from the dead point position, the hydraulic hose bends so as to protrude forward from the boom cylinder. Further, when the boom is swung downward from the dead point position, the hydraulic hose bends so as to protrude upward from the boom cylinder.
[0005]
　If it protrudes forward from the boom cylinder, the bucket may hit the hydraulic hose during excavation and damage the hydraulic hose. Further, if it protrudes upward from the boom cylinder, the hydraulic hose may hit the boom and damage the hydraulic hose.
　Therefore, in view of the above problems, it is an object of the present invention to provide a working machine capable of suppressing the bending of the hydraulic hose when the boom is swung up and down.
Means to solve problems
[0006]
　The working machine according to one aspect of the present invention includes a machine body, a support bracket provided at the front portion of the machine body and having a boom pivot portion at the upper portion and a cylinder pivot portion at the front lower portion, and a boom shaft at the boom pivot portion. A boom that is pivotally supported via the above, a boom cylinder that swings the boom up and down by expanding and contracting while one end side is pivotally supported by the cylinder pivot portion and the other end side is pivotally supported by the boom. A hydraulic hose that is arranged from the rear side to the front side of the support bracket through the support bracket and is connected to the boom cylinder, a first clamp that holds the hydraulic hose in the support bracket, and the hydraulic hose. The support bracket comprises a second clamp that is held in the boom cylinder, the support bracket has a through hole through which the hydraulic hose is inserted in the front-rear direction, and the first clamp is behind the through hole and the boom shaft. It is located in front of the rear end.
[0007]
　Further, the boom cylinder has a cylinder tube pivotally supported by the cylinder pivot portion, and a piston rod that can protrude and retract from the cylinder tube and is pivotally connected to the boom, and the second clamp. Is attached to the cylinder tube, and the hydraulic hose moves within the width of the cylinder tube within the swing range of the boom cylinder.
[0008]
　Further, the first clamp is arranged behind the end of the through hole on the inside of the machine body, and is inclined toward the outside of the machine body as it goes forward and at an angle that moves upward as it goes forward. Looking in the direction.
　Further, the working machine includes a cylinder shaft that pivotally supports the boom cylinder to the cylinder pivot portion, and the first clamp is below the upper end of the cylinder shaft and above the vertical center portion of the through hole. It is located near the bottom of the hole.
[0009]
　Further, the working machine includes a clamp bracket for attaching the first clamp to the support bracket, the support bracket has a side wall including the boom pivot portion, and the clamp bracket is inside the side wall and the side wall. Attached by fasteners from the outside of.
　Further, the side wall has a first side wall and a second side wall arranged to face each other at intervals, and a front wall connecting the front portions of the first side wall and the second side wall to each other, and the cylinder pivot. The branch is provided on the front wall, the through hole is formed lateral to the cylinder pivot of the front wall, and the first clamp is inside at least one of the first side wall and the second side wall. Is placed in.
[0010]
　Further, the working machine is provided with a hose guide attached to the support bracket and guiding the hydraulic hose, and the hose guide is a first regulating portion arranged outside the machine body of the hydraulic hose in front of the through hole. And a second regulating portion extending from the lower end of the first regulating portion toward the inside of the machine and arranged below the hydraulic hose.
The invention's effect
[0011]
　According to the above configuration, the movement of the hydraulic hose when the boom is swung up and down can be satisfactorily absorbed, and the bending of the hydraulic hose can be suppressed.
A brief description of the drawing
[0012]
[Fig. 1] Fig. 1 is a side view of a part of the front work equipment.
FIG. 2 is a partial cross-sectional side view of the swing bracket.
[Fig. 3] Fig. 3 is a perspective view of a swing bracket.
[Fig. 4] It is a front view of a swing bracket.
FIG. 5 is a plan view of the swing bracket.
FIG. 6 is a plan sectional view of a swing bracket.
FIG. 7 is an exploded perspective view of a clamp and a clamp bracket.
FIG. 8 is a side view showing how the boom cylinder moves.
[Fig. 9] It is a schematic side view of a working machine.
Embodiment for carrying out the invention
[0013]
　Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
　FIG. 9 is a schematic side view showing the overall configuration of the working machine 1 according to the present embodiment. In the present embodiment, a backhoe, which is a turning work machine, is exemplified as the work machine 1.
　As shown in FIG. 9, the working machine 1 includes a machine body (swivel table) 2, a traveling device 3, and a front working device 4. A driver's seat (seat) 6 on which the driver (operator) is seated is mounted on the machine body 2.
[0014]
　In the present embodiment, the direction toward the front side of the operator seated in the driver's seat 6 of the work machine 1 (direction of arrow A1 in FIG. 9) is forward, and the direction toward the rear side of the operator (direction of arrow A2 in FIG. 9) is rearward. The direction toward the left side of the operator (the direction toward the front side in FIG. 9) will be described as the left side, and the direction toward the right side of the operator (the direction toward the back side in FIG. 9) will be described as the right side. Further, the horizontal direction, which is the direction orthogonal to the front-rear direction (front-back direction of the machine body) K1 shown in FIG. 9, will be described as the body width direction (width direction of the machine body 2). Further, the direction from the central portion in the width direction of the machine body 2 to the right or the left side will be described as the outside in the width direction of the machine body. The direction opposite to the outside in the width direction of the machine body will be described as the inside direction in the width direction of the machine body.
[0015]
　As shown in FIG. 9, the traveling device 3 is provided on the first crawler traveling body 3L provided on one side (left side) in the width direction of the machine body 2 and on the other side (right side) in the width direction of the machine body 2. It is a crawler type traveling device having a second crawler traveling body 3R. The machine body 2 is supported by the traveling device 3 so as to be able to travel. Further, the machine body 2 is supported on the traveling device 3 so as to be able to turn around a vertical axis (an axial center extending in the vertical direction). A dozer device 7 is attached to the front portion of the traveling device 3.
[0016]
　As shown in FIG. 9, the front work device 4 is arranged on the front side of the machine body 2. The front work device 4 is supported by a swing bracket (support bracket) 10 provided on the front portion of the machine body 2. The swing bracket 10 is rotatably supported around the vertical axis by a pivot bracket 11 provided on the machine body 2 so as to project forward. The front work apparatus 4 has a boom 12 swingably supported by the swing bracket 10, an arm 13 swingably supported on the tip side of the boom 12, and a swingable support on the tip side of the arm 13. It has a supported work tool (bucket) 14.
[0017]
　Further, the front work device 4 has a boom cylinder 19 for driving the boom 12, an arm cylinder 20 for driving the arm 13, and a work tool cylinder 21 for driving the work tool 14. The boom cylinder 19, the arm cylinder 20, and the work tool cylinder 21 are composed of a double-acting hydraulic cylinder.
　As shown in FIGS. 1 to 5, the swing bracket 10 has a boom pivot portion 22 at the upper portion and a cylinder pivot portion 23 at the front lower portion.
[0018]
　As shown in FIG. 3, the boom pivot portion 22 includes a first pivot branch 22L and a second pivot 22R arranged at intervals in the airframe width direction. The first pivot branch 22L is arranged on the left side of the second pivot branch 22R at intervals. A shaft support hole 24L is formed in the first pivot branch 22L. A shaft support hole 24R is formed in the second pivot portion 22R. As shown in FIG. 1, the base portion 12a of the boom 12 is inserted between the first pivot branch 22L and the second pivot 22R. The boom shaft 25 is inserted through the shaft support hole 24L, the shaft support hole 24R, and the base portion 12a of the boom 12 via the bush 26. The boom shaft 25 has an axial center extending in the horizontal direction (horizontal axis center), and the boom 12 can swing up and down around the boom axis 25 (horizontal axis center circumference).
[0019]
　As shown in FIG. 3, the cylinder pivot portion 23 includes a first pivot portion 23L and a second pivot portion 23R arranged at intervals in the airframe width direction. The first pivot branch 23L is arranged on the left side of the second pivot branch 23R at intervals. A shaft support hole 27L is formed in the first pivot branch 23L. A shaft support hole 27R is formed in the second pivot branch 23R. As shown in FIG. 1, one end side of the boom cylinder 19 is inserted between the first pivot branch 23L and the second pivot portion. Specifically, the boom cylinder 19 has a cylinder tube 28 and a piston rod 29 that can protrude and degenerate from the cylinder tube 28, and a connecting portion 30 provided on the bottom side of the cylinder tube 28 is a first pivot portion 23L. It is inserted between the second pivot branch 23R. A cylinder shaft 31 having a horizontal axis is inserted through a shaft support hole 27L, a shaft support hole 27R, and a connecting portion 30 via a bush 32. Therefore, the cylinder tube 28 is rotatably supported around the cylinder shaft 31 (around the center of the horizontal axis) on the cylinder pivot portion 23.
[0020]
　As shown in FIG. 9, the tip end side 29a of the piston rod 29 is pivotally connected to a stay 33 fixed to the lower surface side of the middle portion of the boom 12 via a cylinder pin 34 so as to be rotatably pivotally connected around the horizontal axis. ing.
　The boom cylinder 19 extends by projecting the piston rod 29 from the cylinder tube 28, and contracts by retracting the piston rod 29 with respect to the cylinder tube 28. When the boom cylinder 19 is extended, the boom 12 swings upward, and when the boom cylinder 19 is contracted, the boom 12 swings downward. The boom cylinder 19 swings up and down around the cylinder shaft 31 together with the boom 12.
[0021]
　As shown in FIG. 3, the swing bracket 10 has a side wall 35 including a boom pivot 22. Specifically, the side wall 35 has a first side wall 35L including a first pivot 22L and a second side wall 35R including a second pivot 22R. The first side wall 35L is arranged to face each other on the left side of the second side wall 35R with a gap.
　As shown in FIGS. 1 and 2, the swing bracket 10 has an upper pivot base 36 and a lower pivot base 37 at the rear. The upper pivot base portion 36 and the lower pivot support base portion 37 are provided over the first side wall 35L and the second side wall 35R. The superior support base 36 has an upper wall 36A and a lower wall 36B spaced below the upper wall 36A. As shown in FIG. 9, the upper wall portion 11A of the pivot bracket 11 is inserted between the upper wall 36A and the lower wall 36B. The upper pivot base portion 36 is pivotally connected to the upper wall portion 11A of the pivot bracket 11 by a pin so as to be rotatable around the vertical axis.
[0022]
　As shown in FIGS. 1 and 2, the lower pivot base 37 has an upper wall 37A and a lower wall 37B spaced below the upper wall 37A. As shown in FIG. 9, the lower wall portion 11B of the pivot bracket 11 is inserted between the upper wall 37A and the lower wall 37B. The lower pivot base portion 37 is pivotally connected to the lower wall portion 11B of the pivot bracket 11 by a pin so as to be rotatable around the vertical axis.
[0023]
　As shown in FIGS. 2 and 6, the swing bracket 10 has an opening 38 at the rear and between the lower wall 36B of the upper pivot base 36 and the upper wall 37A of the lower pivot base 37. The control valve for controlling the boom cylinder 19 is provided on the machine body 2 side, and the hydraulic hose 39 connected to the boom cylinder 19 is inside the swing bracket 10 (with the first side wall 35L) from the machine body 2 side via the opening 38. It is inserted between the second side wall 35R). The hydraulic hose 39 includes a first hose 39L connected to the head side of the cylinder tube 28 (the side on which the piston rod 29 protrudes) and a second hose 39R connected to the bottom side of the cylinder tube 28.
[0024]
　As shown in FIGS. 3 and 4, the swing bracket 10 has a front wall 40 that connects the lower front portions of the first side wall 35L and the second side wall 35R. The front portions of the first side wall 35L and the second side wall 35R are formed so as to gradually become thicker from the boom pivot portion 22 to the front wall 40, and are connected to the front wall 40.
　As shown in FIGS. 2 to 4 and 6, the cylinder pivot portion 23 is integrally formed on the front wall 40 so as to project forward. The front wall 40 (swing bracket 10) has a through hole 41 on the side of the cylinder pivot portion 23 for inserting the hydraulic hose 39 in the front-rear direction K1. Specifically, the through hole 41 is a first through hole 41L formed on the left side of the first pivot branch 23L of the cylinder pivot portion 23 and a second through hole 41 formed on the right side of the second pivot portion 23R of the cylinder pivot portion 23. Includes 2 through holes 41R. The first hose 39L is arranged on the left side of the cylinder tube 28 through the first through hole 41L. The second hose 39R is arranged on the right side of the cylinder tube 28 through the second through hole 41R.
[0025]
　As shown in FIG. 6, a clamp structure 42 for holding the hydraulic hose 39 on the swing bracket 10 is provided in the swing bracket 10. Specifically, the clamp structure 42 includes a first clamp structure 42L that holds the first hose 39L and a second clamp structure 42R that holds the second hose 39R. The clamp structure 42 is arranged behind the through hole 41. Specifically, the first clamp structure 42L is arranged behind the first through hole 41L, and the second clamp structure 42R is arranged behind the second through hole 41R.
[0026]
　As shown in FIG. 7, the clamp structure 42 has a first clamp 43 that holds the hydraulic hose 39 on the swing bracket 10, and a clamp bracket 44 that attaches the first clamp 43 to the swing bracket 10. The first clamp 43 is formed of a rubber block body.
　As shown in FIG. 2, the first clamp 43 is arranged behind the through hole 41. Specifically, as shown in FIG. 6, the first clamp 43 is arranged behind the end portion 41a on the machine body side of the through hole 41. Further, as shown in FIG. 2, the first clamp 43 is arranged in front of the rear end of the boom shaft 25. Specifically, the first clamp 43 is arranged in front of the center of the boom shaft 25. The rear end portion of the first clamp 43 is located behind the front end portion of the boom shaft 25.
[0027]
　As shown in FIGS. 2 and 6, the first clamp 43 faces an inclined direction in which the first clamp 43 shifts outward as it goes forward and an inclined direction that shifts upward as it goes forward. Further, as shown in FIG. 2, the first clamp 43 is arranged below the upper end of the cylinder shaft 31 and closer to the lower end portion of the through hole 41 than the vertical center portion of the through hole 41
　. As described above, the first clamp 43 has a through hole 46, a protrusion 47, an insertion hole 48, and a slit 45. The through hole 46 is formed in the upper part of the first clamp 43, and penetrates from the first side surface 43a on the outer side of the machine body to the second side surface 43b on the inner side of the machine body of the first clamp 43. The protrusion 47 is formed in a cylindrical shape and is provided below the first side surface 43a and the second side surface 43b. The insertion hole 48 is formed so as to penetrate from the front surface 43c of the first clamp 43 to the rear surface 43d. The hydraulic hose 39 is inserted into the insertion hole 48. Specifically, the first hose 39L is inserted into the insertion hole 48 of the first clamp structure 42L, and the second hose 39R is inserted into the insertion hole 48 of the second clamp structure 42R. The slit 45 is formed so as to extend the portion of the first clamp 43 on the side of the machine body from the insertion hole 48 from the front surface 43c to the rear surface 43d and to divide the protrusion 47 into upper and lower parts. Therefore, by opening the slit 45, the hydraulic hose 39 can be inserted into the insertion hole 48.
[0028]
　As shown in FIG. 7, the clamp bracket 44 has a mounting member 49 and a holding member 50. As shown in FIG. 6, the mounting member 49 extends in an inclined direction in which the mounting portion 49a is mounted on the front portion of the side wall 35 by a bolt (fastener) 51 and the mounting portion 49a moves rearward toward the inside of the machine. It has an extending portion 49b and a supporting portion 49c extending in an inclined direction that shifts toward the inside of the aircraft from the rear end of the extending portion 49b toward the rear. As shown in FIG. 7, the mounting portion 49a is formed in a vertically long plate shape, and nuts 52 are fixed to the upper and lower portions of the surface of the mounting portion 49a on the side of the machine body. The bolt 51 is screwed into the nut 52 from the outside of the swing bracket 10 through the side wall 35. Therefore, the clamp bracket 44 is attached to the inside of the side wall 35 by a bolt 51 from the outside of the side wall 35. Specifically, the clamp bracket 44 of the first clamp structure 42L is attached to the inner surface of the first side wall 35L, and the clamp bracket 44 of the second clamp structure 42R is attached to the inner surface of the second side wall 35R. The nut 52 does not have to be fixed to the mounting portion 49a.
[0029]
　A nut member 53 is fixed to the upper portion of the support portion 49c so as to project from the support portion 49c toward the inside of the machine. The nut member 53 is formed in a columnar shape. The nut member 53 is inserted into the through hole 46 of the first clamp 43. At the lower part of the support portion 49c, a fitting hole 54 into which the protrusion 47 formed on the first side surface 43a is fitted is formed.
　As shown in FIG. 7, the holding member 50 has an L shape having a first wall 50a that abuts on the second side surface 43b of the first clamp 43 and a second wall 50b that abuts on the lower surface 43e of the first clamp 43. It is formed. The first wall 50a has a bolt insertion hole 50c at the upper portion and a fitting hole 50d at the lower portion into which a protrusion 47 formed on the second side surface 43b is fitted. The first clamp 43 is held by the clamp bracket 44 by inserting the bolt 55 into the bolt insertion hole 50c and screwing it into the nut member 53.
[0030]
　In the above-mentioned clamp structure 42, since the hydraulic hose 39 can be attached to the clamp structure 42 and attached to the swing bracket 10 from the outside in a sub-assembled state, the assembling property is good. Further, even if the clamp structure 42 is inside the swing bracket 10, it can be removed by removing the bolt 51 from the outside, so that maintenance is good.
[0031]
　As shown in FIG. 2, the swing bracket 10 is provided with a hose guide 56 for guiding the hydraulic hose 39. Specifically, as shown in FIGS. 4 and 5, the hose guide 56 includes a first hose guide 56L attached to the first side wall 35L and a second hose guide 56R attached to the second side wall 35R. The hose guide 56 has a mounting plate 57 and a guide rod 58. The mounting plate 57 is formed of a long plate material in the front-rear direction, and is attached to the outer surface of the side wall 35 by bolts 59 above the clamp structure 42. The mounting plate 57 of the first hose guide 56L is attached to the outer surface of the first side wall 35L, and the mounting plate 57 of the second hose guide 56R is attached to the outer surface of the second side wall 35R.
[0032]
　As shown in FIG. 3, the guide rod 58 has a support rod portion 58a, a first regulation portion 58b, and a second regulation portion 58c. The rear portion of the support rod portion 58a is fixed to the front portion of the mounting plate 57 and protrudes forward from the mounting plate 57.
　As shown in FIG. 2, the first regulating portion 58b extends downward from the front end of the supporting rod portion 58a. The first regulation unit 58b is located on the side of the cylinder shaft 31. Specifically, the first regulation unit 58b overlaps with the cylinder shaft 31 in a side view in a state where the swing bracket 10 faces the front surface of the machine body 2. As shown in FIG. 6, the first regulating portion 58b is arranged in front of the through hole 41 and outside the machine body of the hydraulic hose 39.
[0033]
　As shown in FIGS. 3 and 4, the second regulation unit 58c extends from the lower end of the first regulation unit 58b toward the inside of the aircraft. As shown in FIG. 2, the second regulating portion 58c is arranged below the hydraulic hose 39.
　As shown in FIG. 1, the boom cylinder 19 is provided with a second clamp 60 that holds the first hose 39L (hydraulic hose 39) in the boom cylinder 19. The second clamp 60 is attached to a substantially central portion of the cylinder tube 28 in the longitudinal direction by a screw 61. The second clamp 60 is a type member that regulates the movement of the hydraulic hose 39 in the longitudinal direction. The second clamp 60 may be a type of guide that limits the angle of the hydraulic hose 39. The second hydraulic hose 39 is connected to the clamp or the piping member at substantially the same position as the first hose 39L.
[0034]
　FIG. 8 shows the movement of the hydraulic hose 39 when the boom cylinder 19 is expanded and contracted. The hydraulic hose 39 bends when the boom 12 is swung up and down from the dead point position where the cylinder shaft 31, the first clamp 43, and the second clamp 60 are aligned in a straight line. Specifically, when the boom 12 is swung upward from the dead point position, the hydraulic hose 39 bends so as to bulge forward. Further, when the boom 12 is swung upward from the dead point position, the hydraulic hose 39 bends so as to bulge upward. In the present embodiment, the first clamp 43 is arranged behind the through hole 41 and in front of the rear end of the boom shaft 25, and is arranged at an appropriate distance from the cylinder shaft 31. The movement of the hydraulic hose 39 can be absorbed by arranging the first clamp 43 at an appropriate distance from the cylinder shaft 31. Further, it is not necessary to move the position of the second clamp 60 away from the cylinder shaft 31 in order to take the bending allowance of the hydraulic hose 39, and the position of the second clamp 60 can be moved to the cylinder shaft 31. As a result, it is possible to suppress the bending of the hydraulic hose 39 when the boom 12 is swung up and down. As shown in FIG. 8, in the present embodiment, the hydraulic hose 39 is the cylinder tube 28 in the side view regardless of whether the boom cylinder 19 is at the most extended (raised) position X1 or the most contracted (lowered) position X2. It does not stick out. That is, the hydraulic hose 39 moves within the width of the cylinder tube 28 within the swing range around the cylinder shaft 31 of the boom cylinder 19. This makes it possible to prevent the hydraulic hose 39 from coming into contact with an obstacle such as a work tool or a boom 12.
[0035]
　The first regulating unit 58b regulates that the hydraulic hose 39 bends and inflates to the outside of the machine body. Specifically, the end of the first regulating portion 58b on the inside of the machine is located in front of the end of the side wall 35 on the outside of the body, and the hydraulic hose 39 protrudes more outward than the swing bracket 10. Can be regulated. This makes it possible to prevent the hydraulic hose 39 from hitting an obstacle and being damaged.
[0036]
　Further, if the hydraulic hose 39 undulates in an S shape when the boom 12 is swung downward, the hydraulic hose 39 may be damaged by bending with a small curvature. The second regulation unit 58c regulates the waviness of the hydraulic hose 39.
　Various design changes are possible in this embodiment. For example, the first hydraulic hose 39 and the second hydraulic hose 39 may be inserted through the same through hole 41. That is, at least one through hole 41 may be formed. In this case, the clamp structure 42 is provided only on the left or right side of the swing bracket 10. That is, the clamp structure 42 (first clamp 43) may be arranged inside at least one of the first side wall 35L and the second side wall 35R.
[0037]
　Further, the base portion 12a of the boom 12 may be formed in a bifurcated shape, and the boom pivot portion 22 may be sandwiched between the bifurcated base portions 12a. Further, the upper pivot base 36 and the lower pivot base 37 are each composed of one wall portion, and a pivot bracket is inserted between the upper pivot base 36 and the lower pivot base 37, and a single pin is used. The upper pivot base 36 and the lower pivot base 37 may be pivotally connected to the pivot bracket 11. Further, the connecting portion 30 of the cylinder tube 28 may be formed in a bifurcated shape, and the cylinder pivot portion 23 may be sandwiched between the bifurcated connecting portions 30.
[0038]
　The working machine 1 of the present embodiment includes a machine body 2, a support bracket (swing bracket 10) provided at the front portion of the machine body 2 and having a boom pivot portion 22 at the upper portion and a cylinder pivot portion 23 at the front lower portion, and a cylinder. The boom 12 is pivotally supported by the pivot portion 22 via the boom shaft 25, and one end side is pivotally supported by the boom pivot portion 22 and the other end side is pivotally supported by the boom 12 and expands and contracts to move the boom 12 up and down. The boom cylinder 19 to be swung, the hydraulic hose 39 which is arranged from the rear side to the front side of the support bracket through the support bracket and connected to the boom cylinder 19, and the hydraulic hose 39 are held by the support bracket. A first clamp 43 and a second clamp 60 for holding the hydraulic hose 39 in the boom cylinder 19 are provided, and the support bracket has a through hole 41 for inserting the hydraulic hose 39 in the front-rear direction K1, and the first clamp 43 has a through hole 41. , Behind the through hole 41 and in front of the rear end of the boom shaft 25.
[0039]
　According to this configuration, the movement of the hydraulic hose 39 when the boom 12 is swung up and down can be satisfactorily absorbed, and the bending of the hydraulic hose 39 can be suppressed.
　Further, the boom cylinder 19 has a cylinder tube 28 pivotally supported by the cylinder pivot portion 23, and a piston rod 29 that can protrude and retract from the cylinder tube 28 and is pivotally connected to the boom 12. The clamp 60 is attached to the cylinder tube 28, and the hydraulic hose 39 moves within the width of the cylinder tube 28 in a swing range around the cylinder shaft 31 of the boom cylinder 19.
[0040]
　According to this configuration, it is possible to prevent the hydraulic hose 39 from coming into contact with an obstacle and being damaged.
　Further, the first clamp 43 is arranged behind the end of the through hole 41 on the inside side of the machine body, and is inclined toward the outside of the machine body as it goes forward and at an angle that moves upward as it goes forward. Looking in the direction.
[0041]
　According to this configuration, the hydraulic hose 39 can be smoothly arranged from the first clamp 43 through the through hole 41 toward the boom cylinder 19.
　Further, a cylinder shaft 31 for pivotally supporting the boom cylinder 19 to the cylinder pivot portion 23 is provided, and the first clamp 43 is below the upper end of the cylinder shaft 31 and below the lower end of the through hole 41 than the vertical center portion of the through hole 41. It is located closer to the cylinder.
[0042]
　Also with this configuration, the hydraulic hose 39 can be smoothly arranged from the first clamp 43 toward the boom cylinder 19.
　Further, a clamp bracket 44 for attaching the first clamp 43 to the support bracket (swing bracket 10) is provided, the support bracket has a side wall 35 including a boom pivot portion 22, and the clamp bracket 44 is inside the side wall 35. It is attached from the outside of the side wall 35 by a fastener (bolt 51).
[0043]
　According to this configuration, the hydraulic hose 39 and the first clamp 43 can be attached from the outside of the support bracket in an assembled state by assembling to the clamp bracket 44, and the hydraulic hose 39 and the first clamp 43 can be easily attached. Further, since the clamp bracket 44 can be removed from the outside of the support bracket, maintainability is good.
　Further, the side wall 35 has a first side wall 35L and a second side wall 35R arranged to face each other at intervals, and a front wall 40 connecting the front portions of the first side wall 35L and the second side wall 35R. The cylinder pivot portion 23 is provided on the front wall 40, the through hole 41 is formed laterally from the cylinder pivot portion 23 of the front wall 40, and the first clamp 43 is at least the first side wall 35L and the second side wall 35R. Placed inside one.
[0044]
　According to this configuration, the hydraulic hose 39 arranged through the support bracket from the rear side to the front side of the support bracket can be supported inside the side wall 35.
　Further, a hose guide 56 attached to the support bracket (swing bracket 10) and guiding the hydraulic hose 39 is provided, and the hose guide 56 is arranged in front of the through hole 41 and outside the machine body of the hydraulic hose 39. It has a regulation unit 58b and a second regulation unit 58c extending from the lower end of the first regulation unit 58b toward the inside of the machine and arranged below the hydraulic hose 39.
[0045]
　According to this configuration, since the swelling of the hydraulic hose 39 to the outside of the machine body can be regulated by the first regulating portion 58b, it is possible to prevent the hydraulic hose 39 from being damaged by an obstacle. Further, the second regulating portion 58c can prevent the hydraulic hose 39 from being curved and damaged with a small curvature when the boom 12 is lowered.
　Although one embodiment of the present invention has been described above, it should be considered that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.
Code description
[0046]
　　2 Aircraft
　10 Support bracket (swing bracket)
　12 Boom
　19 Boom cylinder
　22 Boom pivot
　23 Cylinder pivot
　25 Boom shaft
　28 Cylinder tube
　29 Piston rod
　31 Cylinder shaft
　35 Side wall
　35L First side wall
　35R Second side wall
　39 Hydraulic hose
　40 Front wall
　41 Through hole
　43 1st clamp
　44 Clamp bracket
　51 Fastener (bolt)
　56 Hose guide
　58b 1st regulation part
　58c 2nd regulation part
　60 2nd clamp
　　K1 Front-back direction

WE CLAIMS

One end of the machine,
　a support bracket provided at the front of the machine and having a boom pivot at the upper part and a cylinder pivot at the lower front, and 　a
　boom pivotally supported by the boom pivot via a boom shaft.
A boom cylinder whose side is pivotally supported by the cylinder pivot and the other end is pivotally supported by the boom and expands and contracts to swing the boom up and down, and the
　support from the rear side to the front side of the support bracket. A hydraulic hose that passes through the bracket and is arranged and connected to the boom cylinder,
　a first clamp that holds the hydraulic hose in the support bracket, and a
　second clamp that holds the hydraulic hose in the boom cylinder. The support bracket
　has
　a through hole for inserting the hydraulic hose in the front-rear direction, and
　the first clamp is arranged behind the through hole and in front of the rear end of the boom shaft. Working machine.
[Claim 2]
　The boom cylinder has a cylinder tube pivotally supported by the cylinder pivot portion and a piston rod that can protrude and retract from the cylinder tube and is pivotally connected to the boom
　.
　The working machine according to claim 1 , wherein the hydraulic hose attached to the cylinder tube moves within the width of the cylinder tube within the swing range of the boom cylinder.
[Claim 3]
　The first clamp is arranged behind the end of the through hole on the inside side of the machine body, and has an inclination direction that shifts to the outside of the machine body as it goes forward and an inclination direction that moves upward as it goes forward. The working machine according to claim 1 or 2, which is suitable.
[Claim 4]
　A cylinder shaft for pivotally supporting the boom cylinder to the cylinder pivot portion is provided, and
　the first clamp is located below the upper end of the cylinder shaft and closer to the lower end portion of the through hole than the vertical center portion of the through hole. The working machine according to any one of claims 1 to 3, which is arranged.
[Claim 5]
　A clamp bracket for attaching the first clamp to the support bracket is provided, the
　support bracket has a side wall including the boom pivot portion, and the
　clamp bracket is provided inside the side wall by a fastener from the outside of the side wall. The working machine according to any one of claims 1 to 4 to be attached.
[Claim 6]
　The side wall has a first side wall and a second side wall that are spaced apart from each other, and a front wall that connects the front portions of the first side wall and the second side wall to each other
　. , The through hole provided in the front
　wall is formed laterally from the cylinder pivot portion of the front wall, and
　the first clamp is arranged inside at least one of the first side wall and the second side wall. The working machine according to claim 5.
[Claim 7]
　A hose guide attached to the support bracket and guiding the hydraulic hose is provided, and the
　hose guide includes a first regulating portion arranged outside the machine body of the hydraulic hose in front of the through hole and the first regulation. The working machine according to any one of claims 1 to 6, further comprising a second regulating portion extending from the lower end of the portion toward the inside of the machine body and arranged below the hydraulic hose.