Vehicle

Abstract

To provide a vehicle capable of suppressing a time lag of start timing of a brake applied to two wheels.SOLUTION: In a vehicle, brake devices (66L, 66R) are provided on the same side in the vehicle width direction with respect to wheels (2L, 2R) respectively, and brake piping systems (82L, 82R) include flexible piping parts (85, 95) having flexibility. At least one of the brake piping systems (82L, 82R) includes a low-flexibility piping part (101) lower in flexibility than the flexible piping parts (85, 95), and in each of the brake piping systems (82L, 82R), the total length of the flexible piping parts (85, 95) included in the respective brake piping systems (82L, 82R) is formed to be the same length.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vehicle. [Background technology]

[0002] Conventionally, vehicles with two wheels arranged side by side in the vehicle width direction are known (see, for example, Patent Document 1). Patent Document 1 discloses a three-wheeled vehicle with two oscillating front wheels, in which the pair of left and right front wheels are configured symmetrically. The front wheels in Patent Document 1 are provided with brake calipers. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-164100 A Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, when a pair of left and right wheels have a symmetrical structure, the brake devices can be arranged symmetrically in the vehicle width direction relative to a plane passing through the center of the vehicle, and the length of the flexible brake piping can be made the same for the two wheels. However, when the brake devices are arranged on the same side of the wheels in the vehicle width direction, the length of the brake pipes provided to one brake device is likely to differ from the length of the brake pipes provided to the other brake device, which is likely to cause bias in hydraulic pressure loss. If bias in hydraulic pressure loss occurs, there is a problem that a time lag may occur in the timing at which the brakes applied to the two wheels start to be applied. The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a vehicle that can suppress the time lag in the timing at which braking is started on two wheels when a braking device is provided on the same side of two wheels arranged side by side in the vehicle width direction. [Means for solving the problem]

[0005] The vehicle includes a body frame, two wheels arranged side by side in the vehicle width direction, suspension devices provided for each of the wheels and suspending the wheels on the body frame, brake devices provided for each of the two wheels, a hydraulic control device that controls the hydraulic pressure of oil sent to the brake devices, a branching section that branches the oil, and a brake piping system provided for each of the brake devices and connecting the brake devices to the branching section, wherein the brake devices are provided on the same side in the vehicle width direction for each of the wheels, the brake piping system includes flexible piping sections that have flexibility, at least any of the brake piping systems includes a low-flexibility piping section that is less flexible than the flexible piping section, and in each of the brake piping systems, the overall length of the flexible piping section included in each of the brake piping systems is formed to be the same length. Effect of the Invention

[0006] A vehicle can be provided that can reduce the time lag in the timing at which braking begins on two wheels arranged side by side in the vehicle width direction when a braking device is provided on the same side of the two wheels. [Brief description of the drawings]

[0007] [Figure 1] 1 is a perspective view of a vehicle according to an embodiment. [Diagram 2] FIG. 2 is a perspective view of the vehicle with the cover member omitted. [Diagram 3] FIG. 2 is a top view of the suspension device and its peripheral members. [Figure 4] FIG. 2 is a perspective view of the left front wheel and its surroundings viewed from above and at the front. [Diagram 5] FIG. 2 is a perspective view of the left front wheel from above on the left side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description, directions such as front, rear, left, right, up and down are the same as directions relative to the vehicle body unless otherwise specified. In addition, the symbol FR in each drawing indicates the front of the vehicle body, the symbol UP indicates the upper side of the vehicle body, and the symbol LH indicates the left side of the vehicle body.

[0009] [Embodiment Mode] Fig. 1 is a perspective view of a vehicle 1 according to an embodiment of the present invention, and Fig. 2 is a perspective view of the vehicle 1 with a cover member 26 omitted. In the description of this embodiment, a pair of left and right configurations may be distinguished by adding "L" to the reference symbol indicating the left configuration and "R" to the reference symbol indicating the right configuration. Also, when there is no distinction between left and right, they may be indicated by only the reference symbol without "L" and "R".

[0010] As shown in FIG. 1 and FIG. 2, the vehicle 1 in this embodiment is configured as an autonomous vehicle equipped with a pair of left and right front wheels 2L, 2R at the front of the vehicle body and a single rear wheel 3 at the center of the left and right of the rear of the vehicle body, and is configured as an autonomous vehicle in which an occupant P can sit and move. That is, the vehicle 1 in this embodiment is not equipped with an operating member for the occupant P to perform turning operation or accelerator operation, but is equipped with a driving unit that manages autonomous driving. The driving unit of the vehicle 1 realizes autonomous driving by controlling turning operation and forward and backward movement of the vehicle body. The driving unit has, for example, a function of acquiring information on the surroundings and current position using a sensor, a camera, etc., and / or a function of acquiring information necessary for autonomous driving from outside the vehicle 1 using communication, etc., and is configured to realize autonomous driving of the vehicle 1 by autonomous or remote operation.

[0011] As shown in FIG. 2, the vehicle 1 has a body frame 5 that supports the front wheels 2L, 2R and the rear wheels 3. The vehicle body frame 5 has a front end frame 10 that constitutes the lower front end. The front end frame 10 has a pair of left and right extension portions 10A extending in the front-rear direction, and a substantially U-shaped bridge portion 10B that connects the front ends of the extension portions 10A. The bridge portion 10B extends upward when viewed from the side of the vehicle body. A cross member 10C extending left and right is connected between the extension portions 10A of the front end frame 10.

[0012] A pair of left and right seat frames 14 are connected to the rear of the front end frame 10. The seat frames 14 are formed in a trapezoidal shape when viewed from the side of the vehicle. A plurality of cross members (not shown) that connect the seat frames 14 to the left and right are supported between the left and right seat frames 14.

[0013] A central frame 16 is connected to the rear of the seat frame 14. The central frame 16 extends in the left-right and up-down directions. The central frame 16 includes an upper cross portion 16A and a lower cross portion 16B that extend in the left-right direction. The upper cross portion 16A and the lower cross portion 16B are spaced apart in the up-down direction. The lower cross portion 16B is longer in the vehicle width direction than the upper cross portion 16A. A pair of left and right suspension support portions 16C are provided on the upper cross portion 16A and the lower cross portion 16B, outboard of the seat frame 14 in the vehicle width direction.

[0014] A pair of left and right rear end frames 22 are connected to the rear of the central frame 16. The rear end frames 22 have a base portion 22A extending in the up-down direction along the central frame 16. A rear extension portion 22B extending rearward is connected to the upper end of the base portion 22A. An upward extension portion 22C is formed at the rear end of the rear extension portion 22B, which extends inward in the vehicle width direction and then upward. A top portion 22D extending forward is formed at the upper end of the upward extension portion 22C. The top portion 22D is connected to the left and right at its front end.

[0015] In the pair of left and right rear end frames 22, a battery stay 23 is provided on the base portion 22A and the rear extension portion 22B. In addition, a rear head pipe 24 extending in the vertical direction is provided on the upward extension portion 22C. The rear frame 18 is connected between the base portion 22A of the rear end frame 22 and the upper portion of the upward extension portion 22C. The rear frame 18 inclines backward as it advances upward. Side protector frames 20 are disposed on the left and right sides of the rear frame 18. The side protector frames 20 are connected to the lower portion of the rear frame 18 and the top portion 22D of the rear end frame 22.

[0016] A pair of left and right front frame members 12 are supported on the upper ends of the bridge portions 10B of the front end frame 10. A pair of left and right upper frames 25 extending in an arc shape in a side view of the vehicle are provided between the front frame members 12 and the top portions 22D of the rear end frame 22.

[0017] The left and right suspension support parts 16C of the central frame 16 support suspensions 50L and 50R. The suspensions 50L and 50R suspend the front wheels 2L and 2R. The suspensions 50L and 50R have swing arms 52L and 52R extending in the front-rear direction. The swing arms 52L and 52R are supported to be swingable on the lower cross part 16B of the central frame 16 via a pivot shaft 56a at the rear end. The front wheels 2L and 2R are supported on the front end parts of the swing arms 52L and 52R via an axle 2a. The front wheels 2L and 2R have an in-wheel motor (not shown) that can be driven forward and backward. Therefore, the axle 2a is also the drive shaft of the in-wheel motor. The front wheels 2L and 2R are located on the outer side of the seat frame 14 in the vehicle width direction. The front wheels 2L and 2R are provided with front wheel brake devices 66L and 66R. Suspensions 54L, 54R are connected between the swing arms 52L, 52R and the upper cross portion 16A of the central frame 16.

[0018] The pair of left and right front wheels 2L, 2R constitute a so-called differential two-wheel system. That is, the vehicle 1 can turn when a difference in rotational speed occurs between the left and right front wheels 2L, 2R. Therefore, for example, when the left and right front wheels 2L, 2R rotate in one direction, the vehicle 1 can move in one direction, the front and rear. Also, when the left and right front wheels 2L, 2R rotate in opposite directions, the vehicle 1 can turn.

[0019] A rear fork 46 is rotatably supported on the rear head pipe 24 of the rear end frame 22. The rear fork 46 is supported by a steering shaft so as to be steerable left and right. A rear wheel 3 is rotatably supported on the lower end of the rear fork 46 via an axle 3a. A rear wheel brake device 66B is provided on the rear wheel 3.

[0020] A seat 40 on which an occupant P sits is supported by the seat frame 14. A step 38 (see FIG. 1) on which the occupant P places his / her legs is provided at the front lower part of the seat 40. The step 38 is supported by the front end frame 10. A backrest 42 is supported at the rear upper part of the seat 40. The backrest 42 is supported by the rear frame 18. A seat belt 44 is provided on the backrest 42.

[0021] A battery 6 is mounted on the battery stay 23. The battery 6 is configured as a large-capacity battery that drives the in-wheel motor. In this embodiment, the battery 6 functions as an auxiliary battery that supplies power to the driving unit 8 under the seat 40 and the like. Note that instead of the configuration in which the battery 6 includes an auxiliary battery, the battery 6 may be used to drive the in-wheel motor, and the vehicle 1 may be configured to separately mount a battery for the auxiliary devices.

[0022] A pressurizing modulator 4 is disposed below the seat 40. The pressurizing modulator 4 is connected to the front wheel brake devices 66L, 66R via a front wheel brake piping system. The pressurizing modulator 4 is also connected to the rear wheel brake device 66B via a rear wheel brake piping system. The pressurizing modulator 4 controls the hydraulic pressure of the hydraulic fluid flowing through the front wheel brake devices 66L, 66R and the rear wheel brake device 66B. For example, the pressurizing modulator 4 may function as a braking force adjusting device that locks one of the front wheels 2L, 2R to enable the vehicle 1 to turn. The pressurizing modulator 4 includes a pump that is driven by a motor to adjust the hydraulic pressure, a hydraulic circuit section connected to the pump, a valve that switches the hydraulic circuit section, and an electronic control section that controls the motor.

[0023] A PCU (Power Control Unit) 7 is supported in front of the pressure modulator 4. The PCU 7 is supported by a cross member of the seat frame 14. The PCU 7 includes an inverter and the like, and converts, for example, DC power supplied from a battery into AC power and supplies the converted AC power to the in-wheel motor. Furthermore, when the in-wheel motor is in regeneration mode, the PCU 7 converts the AC power generated by the in-wheel motor into DC power and charges the battery 6.

[0024] An operating unit 8 is mounted near the PCU 7. The operating unit 8 includes an ECU (Electronic Control Unit) not shown. The ECU may not be a single ECU, but may include multiple ECUs. The ECU includes a processor, a storage device such as a semiconductor memory, and an interface with an external device. The storage device stores programs executed by the processor, data used by the processor for processing, and the like.

[0025] The driving unit 8 executes control related to the automatic driving of the vehicle 1. In the automatic driving, the driving unit 8 drives the pair of front wheels 2L, 2R, and brakes the front wheels 2L, 2R and the rear wheel 3. The driving unit 8 activates the pressure modulator 4.

[0026] A cover member 26 (see FIG. 1) is supported on the body frame 5. As shown in FIG. 1, the cover member 26 includes a front cover 28 that covers the front end frame 10 and the front frame 12 from the front, an under-seat cover 29 that covers the seat frame 14 from the front, a body cover 30 that covers the seat frame 14, the central frame 16 and the rear end frame 22 from the left and right sides and rear, a rear top cover 31 that covers the rear end frame 22 from above, and a roof cover 32 that covers the upper part of the upper frame 25.

[0027] A front screen 33 made of a material that allows the occupant P to see ahead is provided between the front cover 28 and the roof cover 32. The front screen 33 is supported by a pair of upper frames 25 on the left and right. A plurality of headlights 34 and turn signals 35 are supported on the front cover 28.

[0028] FIG. 3 is a top view of the suspension devices 50L, 50R and their peripheral members. The right suspension 50R has a swing arm 52R. The swing arm 52R has a pivot shaft portion 56 extending in the left-right direction at its rear end. A pair of left and right arm portions 58B, 58C extending forward are formed on the pivot shaft portion 56. The pair of left and right arm portions 58B, 58C are connected by a plate-shaped cross portion 58A extending in the left-right direction. An opening 53 penetrating in the up-down direction is formed by the surrounding shape of the pivot shaft portion 56, the left and right arm portions 58B, 58C, and the cross portion 58A.

[0029] A pivot shaft 56a extending in the left-right direction is inserted through the pivot shaft portion 56 of the swing arm 52R. The pivot shaft 56a is supported by the lower cross portion 16B (see FIG. 2) of the central frame 16. The swing arm 52R swings about the pivot shaft portion 56. A right front wheel (wheel) 2R is disposed between the pair of left and right arm portions 58B, 58C. The right front wheel 2R is supported by the arm portions 58B, 58C via an axle 2a.

[0030] The lower end of the suspension 54R is connected to the cross portion 58A. The upper end of the suspension 54R is connected to the upper cross portion 16A of the central frame 16 (see FIG. 2). The swing arm 52R and the suspension 54R constitute a right suspension device 50R in this embodiment.

[0031] The left suspension 50L is configured similarly to the right suspension 50R. That is, the left suspension 50L of the present embodiment is configured by a swing arm 52L and a suspension 54L. In the left suspension 50L, a left front wheel (wheel) 2L is supported by arm portions 58B and 58C via an axle 2a.

[0032] The pair of front wheels 2L, 2R are provided with front wheel brake devices (brake devices) 66L, 66R, respectively. The left front wheel brake device 66L and the right front wheel brake device 66R are configured similarly. In this embodiment, the front wheel brake devices 66L, 66R are drum brakes equipped with a slave cylinder 67 (see FIG. 5). The front wheel brake devices 66L, 66R are provided on the left side (one side in the vehicle width direction) of each of the front wheels 2L, 2R. Therefore, the left front wheel brake device 66L is provided on the outer side of the vehicle 1 of the front wheel 2L. The right front wheel brake device 66R is provided on the inner side of the vehicle 1 of the front wheel 2R.

[0033] As described above, in the vehicle 1 according to this embodiment, the pair of front wheels 2L, 2R, the swing arms 52L, 52R, the suspensions 54L, 54R, and the front wheel braking devices 66L, 66R are configured using similar members and parts on the left and right and are arranged in the same manner.

[0034] The front wheel brake devices 66L, 66R are operated by a pressure modulator (hydraulic control device) 4. The pressure modulator 4 has a rectangular parallelepiped shape in appearance. The pressure modulator 4 is supported by a bracket (not shown) below the seat 40. The pressure modulator 4 is disposed on the right side (the other side in the vehicle width direction) with respect to the center of the vehicle width. Input brake pipes 71, 72 are connected to the upper surface of the pressure modulator 4. The input brake pipes 71, 72 extend forward and left and are connected to master cylinders 73, 74, respectively.

[0035] A front wheel output brake pipe 78 and a rear wheel output brake pipe 70 are connected to the front surface of the pressure modulator 4. Left and right front wheel brake piping systems (brake piping systems) 82L, 82R are connected to the front wheel output brake pipe 78 via a branching portion 80. The rear wheel output brake pipe 70 is connected to the rear wheel brake piping system.

[0036] The branch portion 80 connected to the front wheel output brake pipe 78 is located in the center in the vehicle width direction. The branch portion 80 is a bifurcated joint. The branch portion 80 includes an input portion (not shown) to which the front wheel output brake pipe 78 is connected and to which oil is input, and a pair of output portions 80B, 80C to which the oil input from the input portion (not shown) is output. The output portions 80B, 80C are configured symmetrically on the left and right.

[0037] An output portion 80B of the branching portion 80 is connected to the right front wheel brake device 66R via a right front wheel brake piping system 82R. An output portion 80C of the branching portion 80 is connected to the left front wheel brake device 66L via a left front wheel brake piping system 82L.

[0038] The right front wheel brake piping system 82R has a first right rubber hose (first flexible piping, flexible piping) 86 that is flexible. One end of the first right rubber hose 86 is connected to the output portion 80B of the branching portion 80. The first right rubber hose 86 extends from the branching portion 80 to the right side (the other side in the vehicle width direction). Thus, the first right rubber hose 86 constitutes a vehicle width direction extending portion 90R in the front wheel brake piping system 82R. The other end of the first right rubber hose 86 is connected to the input portion 84B of the one-side joint portion (joint portion) 84.

[0039] The one-side joint portion 84 has a fixed portion 84A, an input portion 84B supported by the fixed portion 84A, and an output portion 84C supported by the fixed portion 84A. The input portion 84B and the output portion 84C are in communication with each other. The one-side joint portion 84 has the fixed portion 84A fixed to the left arm portion 58B of the right swing arm 52R. The one-side joint portion 84 is fixed to a position P0 slightly forward of the branch portion 80. The one-side joint portion 84 is disposed such that the input portion 84B faces rearward and the output portion 84C faces forward.

[0040] A flexible second right rubber hose (second flexible piping, flexible piping) 88 is connected to the output portion 84C of the one-side joint portion 84. The second right rubber hose 88 extends forward from the one-side joint portion 84. Thus, the second right rubber hose 88 constitutes a front-rear direction extending portion 92R that extends in the front-rear direction. The second right rubber hose 88 is connected to the right front wheel braking device 66R. The second right rubber hose 88 is connected to the slave cylinder 67 (see FIG. 5) of the front wheel braking device 66R on the left side (one side in the vehicle width direction) of the front wheel 2R.

[0041] The first right rubber hose 86 constituting the vehicle width direction extending portion 90R has a deflection amount set according to the swing amount of the swing arm 52R relative to the vehicle body frame (vehicle body) 5. In addition, the second right rubber hose 88 constituting the front-rear direction extending portion 92R is assembled to the slave cylinder 67 with the deflection amount appropriately set. Since the second right rubber hose 88 is assembled in a deflected state, it is easy to assemble the right front wheel brake piping system 82R to the slave cylinder 67 and to disassemble it for maintenance. The deflection amount of the first right rubber hose 86 is set to be larger than the deflection amount of the second right rubber hose 88. In addition, instead of the second right rubber hose 88, the piping portion of the second right rubber hose 88 may be made of metal or highly elastic rubber that does not have flexibility or bendability to the extent that the diameter of the pipe does not change due to changes in hydraulic pressure.

[0042] In this embodiment, the right front wheel brake piping system 82R is constituted by the first right rubber hose 86, the one-side joint portion 84, and the second right rubber hose 88. In other words, the right front wheel brake piping system 82R has a flexible piping portion 85 and the one-side joint portion 84. The flexible piping portion 85 of the right front wheel brake piping system 82R is constituted by the first right rubber hose 86 and the second right rubber hose 88.

[0043] Fig. 4 is a perspective view of the left front wheel 2L and its surroundings as viewed from above the front, and Fig. 5 is a perspective view of the left front wheel 2L as viewed from above the left. The left front wheel brake piping system 82L differs from the right front wheel brake piping system 82R in that it further has an other-side joint portion (first joint portion, joint portion) 94 and a metal pipe 102 of a low-flexibility piping portion 101. That is, the left front wheel brake piping system 82L has a first left rubber hose (first flexible piping, flexible piping) 98 corresponding to the first right rubber hose 86, a one-side joint portion (second joint portion, joint portion) 96 corresponding to the one-side joint portion 84, and a second left rubber hose (second flexible piping, flexible piping) 100 corresponding to the second right rubber hose 88, as well as the other-side joint portion 94 and the metal pipe 102.

[0044] In the left front wheel brake piping system 82L, the first left rubber hose 98 is configured symmetrically to the first right rubber hose 86. One end of the first left rubber hose 98 is connected to the output portion 80C of the branching portion 80. The first left rubber hose 98 extends from the branching portion 80 to the left side (one side in the vehicle width direction). Thus, the first left rubber hose 98 constitutes the vehicle width direction extending portion 90L in the front wheel brake piping system 82L. The other end of the first left rubber hose 98 is connected to the input portion 94B of the other side joint portion 94.

[0045] The other-side joint portion 94 is configured symmetrically to the one-side joint portion 84 of the right front wheel brake piping system 82R. Similar to the one-side joint portion 84, the other-side joint portion 94 has a fixed portion 94A, an input portion 94B, and an output portion 94C. The fixed portion 94A of the other-side joint portion 94 is fixed to the right arm portion 58C of the left swing arm 52L. The other-side joint portion 94 is fixed to a position P0 slightly forward of the branch portion 80. The other-side joint portion 94 is disposed such that the input portion 94B faces rearward and the output portion 94C faces forward.

[0046] The other-side joint portion 94 is disposed at approximately the same position in the front-rear direction as the one-side joint portion 84. Therefore, the other-side joint portion 94 is disposed at the same position P0 in the front-rear direction of the vehicle body as the one-side joint portion 84. Furthermore, the other-side joint portion 94 is disposed at the same position P0 in the vertical direction of the vehicle body as the one-side joint portion 84.

[0047] A metal pipe 102 is connected to the output portion 94C of the other-side joint portion 94. The metal pipe 102 is made of a metal that is neither flexible nor bendable enough that the diameter of the pipe does not change due to changes in hydraulic pressure. The metal pipe 102 extends forward from the output portion 94C of the other-side joint portion 94, and then curves backward and extends toward the pivot shaft portion 56. At this time, the metal pipe 102 extends backward along the right arm portion 58C, and extends to the left arm portion 58B, bypassing the rear of the suspension 54L.

[0048] The metal pipe 102 extends forward along the left arm portion 58B and is connected to the input portion 96B of the one-side joint portion 96 from the front. The metal pipe 102 has a bent portion 104 that bypasses the rear of the suspension 54L. The metal pipe 102 is fixed to the left swing arm 52L. The metal pipe 102 can swing integrally with the left swing arm 52L.

[0049] The one-side joint portion 96 is configured similarly to the one-side joint portion 84 of the right front wheel brake piping system 82R, and has a fixed portion 96A, an input portion 96B, and an output portion 96C. The one-side joint portion 96 has the fixed portion 96A fixed to the left arm portion 58B of the left swing arm 52L. The one-side joint portion 96 is disposed such that the input portion 96B faces rearward and the output portion 96C faces forward. The one-side joint portion 96 is disposed at approximately the same position as the other-side joint portion 94 in the front-rear direction. Therefore, the one-side joint portion 96 is disposed at the same position P0 as the other-side joint portion 94 in the front-rear direction of the vehicle body.

[0050] A flexible second left rubber hose 100 is connected to the output portion 96C of the one-side joint portion 96. The second left rubber hose 100 extends forward from the one-side joint portion 96. Thus, the second left rubber hose 100 constitutes the front-rear direction extending portion 92L of the front wheel brake piping system 82L. The second left rubber hose 100 is connected to the left front wheel brake device 66L. The second left rubber hose 100 is connected to the slave cylinder 67 (see FIG. 5) of the front wheel brake device 66L on the left side (one side in the vehicle width direction) of the front wheel 2L.

[0051] The first left rubber hose 98 constituting the vehicle width direction extending portion 90L has a deflection amount set according to the swing amount of the swing arm 52L relative to the body frame 5. In addition, the second left rubber hose 100 constituting the front-rear direction extending portion 92L is assembled to the slave cylinder 67 with the deflection amount appropriately set. Since the second left rubber hose 100 is assembled in a deflected state, it is easy to assemble the left front wheel brake piping system 82L to the slave cylinder 67 and to disassemble for maintenance. The deflection amount of the first left rubber hose 98 is set to be larger than the deflection amount of the second left rubber hose 100. In addition, instead of the second left rubber hose 100, the piping portion of the second left rubber hose 100 may be made of metal or highly elastic rubber that does not have flexibility or bendability to the extent that the diameter of the pipe does not change due to changes in hydraulic pressure.

[0052] The left front wheel brake piping system 82L has a flexible piping section 95, a less flexible piping section 101, an other-side joint section 94, and a one-side joint section 96. The flexible piping section 95 of the left front wheel brake piping system 82L is composed of a first left rubber hose 98 and a second left rubber hose 100. The less flexible piping section 101 of the left front wheel brake piping system 82L is composed of a metal pipe 102. The less flexible piping section 101 is made of a material that is less flexible than the flexible piping sections 85, 95.

[0053] In this embodiment, the overall length of the flexible pipe section 95 of the left front wheel brake piping system 82L is formed to be the same as the overall length of the flexible pipe section 85 of the right front wheel brake piping system 82R. In particular, in this embodiment, the first left rubber hose 98 of the left front wheel brake piping system 82L is formed to be the same as the first right rubber hose 86 of the right front wheel brake piping system 82R. Also, in this embodiment, the second left rubber hose 100 of the left front wheel brake piping system 82L is formed to be the same as the second right rubber hose 88 of the right front wheel brake piping system 82R. Here, the term "similar length" is used to mean not only the case where the lengths are the same, but also the case where the lengths differ due to manufacturing errors during manufacturing. Also, the term "similar length" is used to mean the case where the lengths differ to an extent that the bias in hydraulic loss cannot be significantly recognized.

[0054] The in-wheel motors provided on the front wheels 2L, 2R are driven by power supplied from a battery 6. The battery 6 is connected to the PCU 7 via a power harness (not shown). As shown in FIG. 3, the PCU 7 is disposed between the left suspension device 50L and the right suspension device 50R. Power harnesses 64L, 64R for supplying power extend from the PCU 7.

[0055] The power harness 64R extending toward the right front wheel 2R extends rearward from the PCU 7 toward the right side along the right seat frame 14. The power harness 64R is routed rearward passing above the driving unit 8 and the pressure modulator 4, and bends toward the right swing arm 52R rearward of the cross section 58A and forward of the pivot shaft section 56. The power harness 64R passes above the left arm section 58B in the swing arm 52R, passes behind the suspension 54R, and is routed forward along the left surface of the right arm section 58C. The power harness 64R routed forward is routed on the outer side of the right front wheel 2R of the vehicle 1, and is connected to the in-wheel motor from the right side of the front wheel 2R (the other side in the vehicle width direction).

[0056] The power harness 64L extending toward the left front wheel 2L heads rearward from the PCU 7, passes under the master cylinders 73, 74, and is routed rearward, then bends toward the left swing arm 52L rearward of the cross portion 58A and forward of the pivot shaft portion 56. Then, in the swing arm 52L, the power harness 64L passes above the right arm portion 58C, passes from above to below the opening 53 of the swing arm 52L, and is routed forward along the left surface of the right arm portion 58C. The power harness 64L routed forward is routed inside the left front wheel 2L of the vehicle 1, and is connected to the in-wheel motor from the right side (the other side in the vehicle width direction) of the front wheel 2L.

[0057] For this reason, in this embodiment, the power harnesses 64L, 64R are routed on the same side of the pair of front wheels 2L, 2R in the vehicle width direction. Also, the front wheel brake devices 66L, 66R are provided on the same side of the pair of front wheels 2L, 2R in the vehicle width direction.

[0058] Next, the operation of this embodiment will be described. The vehicle 1 is automatically driven, for example, under the control of the driving unit 8. At this time, when the vehicle 1 stops, the driving unit 8 controls the pressurizing modulator 4 based on the wheel speed. In this embodiment, the driving unit 8 controls the pressurizing modulator 4, which adjusts the hydraulic pressure of the brake fluid. The adjusted hydraulic pressure of the brake fluid is branched by the branching portion 80, and is transmitted to the left front wheel brake device 66L via the left front wheel brake piping system 82L, and is also transmitted to the right front wheel brake device 66R via the right front wheel brake piping system 82R. As a result, the left and right front wheel brake devices 66L, 66R are operated, and the vehicle 1 is braked.

[0059] In this embodiment, the path lengths of the front wheel brake piping systems 82L, 82R for the two front wheels 2L, 2R are different from each other. Therefore, there is a possibility that a bias in hydraulic pressure loss occurs due to the difference in path length, and the timing at which braking is started on the two front wheels 2L, 2R may differ.

[0060] In contrast, in the present embodiment, the front wheel brake piping system 82L is equipped with a low-flexibility piping section 101, so that the overall lengths of the flexible piping sections 85, 95 of the front wheel brake piping systems 82L, 82R, which have different path lengths, are made the same.

[0061] That is, the metal pipe 102 of the low flexibility piping section 101 is not easily deformed even when the hydraulic pressure changes, so that the hydraulic pressure can be transmitted while suppressing the occurrence of hydraulic pressure loss. Therefore, the flexible piping sections 85, 95 in which hydraulic pressure loss occurs can be made to have the same length for the front wheel brake piping systems 82L, 82R having different path lengths, and unevenness in hydraulic pressure loss can be suppressed. Therefore, in this embodiment, even if the path lengths of the front wheel brake piping systems 82L, 82R are different from each other, the same hydraulic pressure is easily transmitted to the front wheel brake devices 66L, 66R at the same timing, and it is easy to align the timing of starting braking.

[0062] In particular, in this embodiment, the first right rubber hose 86 and the first left rubber hose 98 are formed to be the same length and made of the same material. Also, the second right rubber hose 88 and the second left rubber hose 100 are formed to be the same length and made of the same material. This makes it easier to make the flexible piping sections 85, 95 of the left and right front wheel brake piping systems 82L, 82R have the same configuration, making it easier to prevent uneven hydraulic pressure loss. Also, it becomes possible to standardize parts.

[0063] In this embodiment, the branching portion 80 is disposed at the center in the vehicle width direction, and is formed so that the distances from the branching portion 80 to the one-side joint portion 84 and the other-side joint portion 94 are equal. This makes it easy to arrange the first right rubber hose 86 and the first left rubber hose 98 symmetrically, making it easier to suppress variations in the amount of flexure between the first right rubber hose 86 and the first left rubber hose 98, and making it easier to suppress uneven hydraulic pressure loss.

[0064] Here, in this embodiment, since the right front wheel brake piping system 82R does not include a low flexibility piping section, the one-side joint part 84 may be omitted, but it is preferable to provide the one-side joint part 84. In other words, by providing the one-side joint part 84, it becomes easier to make part of the configuration of the right front wheel brake piping system 82R and the left front wheel brake piping system 82L common to each other.

[0065] Moreover, by providing the one-side joint portion 84, the deflection of the flexible piping portion 85 can be adjusted separately on the upstream side and downstream side of the one-side joint portion 84. Specifically, on the upstream side of the one-side joint portion 84, the first right rubber hose 86 can be set to a large deflection amount corresponding to the swing amount of the swing arm 52L. On the other hand, on the downstream side of the one-side joint portion 84, the first right rubber hose 86 can be set to a small deflection amount corresponding to the expansion and contraction amount of the slave cylinder 67 (see FIG. 5). In this way, by providing the one-side joint portion 84, the deflection amount can be separated between the upstream side and downstream side of the one-side joint portion 84. Therefore, compared to the case where the deflection amount is set by connecting the branch portion 80 and the right front wheel brake device 66R with one flexible hose, it is possible to easily separate and set the deflection amount according to symmetrical vibration without the hose being arranged to extend obliquely from the branch portion 80 to the front wheel brake device 66R. Therefore, the vibration space of the front wheel brake piping system 82R can be reduced.

[0066] As described above, according to this embodiment to which the present invention is applied, there is provided a vehicle body frame 5, two front wheels 2L, 2R arranged side by side in the vehicle width direction, suspension devices 50L, 50R provided for each of the front wheels 2L, 2R and suspending the front wheels 2L, 2R on the vehicle body frame 5, front wheel brake devices 66L, 66R provided for the two front wheels 2L, 2R, respectively, a pressure modulator 4 that controls the hydraulic pressure of the hydraulic fluid sent to the front wheel brake devices 66L, 66R, a branching section 80 provided in the pressure modulator 4 to branch the hydraulic fluid, and a front wheel brake device In a vehicle 1 equipped with front wheel brake piping systems 82L, 82R connecting 66L, 66R to a branch portion 80, the front wheel brake devices 66L, 66R are provided on the same side of the vehicle width direction relative to each front wheel 2L, 2R, the front wheel brake piping systems 82L, 82R include flexible piping sections 85, 95 having flexibility, at least one of the front wheel brake piping systems 82L, 82R includes a low-flexibility piping section 101, and in each front wheel brake piping system 82L, 82R, the flexible piping sections 85, 95 included in each front wheel brake piping system 82L, 82R are formed to have the same overall length. According to this configuration, the overall lengths of the flexible piping portions 85, 95 are formed to be the same in both front wheel brake piping systems 82L, 82R, so that uneven deformation of the flexible piping portions 85, 95 between the front wheel brake piping systems 82L, 82R can be suppressed, and unevenness in hydraulic pressure loss can be reduced. Therefore, according to the above configuration, when the front wheel brake devices 66L, 66R are provided on the same side of the two front wheels 2L, 2R arranged side by side in the vehicle width direction, it is possible to suppress the time lag in the start timing of braking applied to the two front wheels 2L, 2R.

[0067] In this embodiment, the flexible piping sections 85, 95 have a plurality of rubber hoses 86, 88, 98, 100, and of the plurality of rubber hoses 86, 88, 98, 100, the first right rubber hose 86 and the first left rubber hose 98 are vehicle width direction extending sections 90L, 90R extending in the vehicle width direction from the branching section 80 to joint sections 84, 94 provided on the respective suspension devices 50L, 50R, and the second right rubber hose 88 and the second left rubber hose 100 are fore-and-aft direction extending sections 92L, 92R extending in the vehicle fore-and-aft direction from joint sections 84, 96 provided on the respective suspension devices 50L, 50R to the front wheel braking devices 66L, 66R, and the vehicle width direction extending sections 90L, 90R have greater deflection than the fore-and-aft direction extending sections 92L, 92R. According to this configuration, while the longitudinal extensions 92L, 92R of the front wheel brake piping systems 82L, 82R are fixed, the transverse extensions 90L, 90R can be vibrated in response to the vertical vibration of the suspensions 50L, 50R. This makes it easier to vibrate the transverse extensions 90L, 90R only in the space extending in the transverse direction of the vehicle, thereby reducing the longitudinal vibration space. This reduces the vibration space of the front wheel brake piping systems 82L, 82R. If the front wheel brake piping systems 82L, 82R were each configured with a single rubber hose for the front wheel brake devices 66L, 66R, the hose would be arranged to extend diagonally from the branching portion 80 to the front wheel brake device 66R, resulting in a large vibration space for the front wheel brake piping systems 82L, 82R.

[0068] In addition, in this embodiment, at least one of the front wheel brake piping systems 82L includes an other-side joint portion 94 to which the vehicle width direction extending portion 90L is connected, a one-side joint portion 96 to which the fore-aft direction extending portion 92L is connected, and a low-flexibility piping portion 101 connecting the other-side joint portion 94 and the one-side joint portion 96. According to this configuration, the connection position of the vehicle width direction extending portion 90L extending from the branch portion 80 can be separated from the connection position of the fore-aft direction extending portion 92L extending from the front wheel brake device 66L while suppressing the occurrence of hydraulic pressure loss, thereby allowing freedom in the layout of at least one of the front wheel brake piping systems 82L.

[0069] In addition, in this embodiment, each of the flexible piping sections 85, 95 has a plurality of rubber hoses 86, 88, 98, 100, and the other front wheel brake piping system 82R includes a joint section 84 to which a vehicle width direction extending section 90R is connected and to which a fore-aft direction extending section 92R is connected, and the one side joint section 84, the other side joint section 94 and the one side joint section 96 are arranged at the same position P0 in the fore-aft direction of the vehicle body. According to this configuration, the other front wheel brake piping system 82R can be made more compact than the one front wheel brake piping system 82L, while the lengths of the front-rear direction extending portions 92L, 92R can be made the same. In this case, since the overall length of the flexible piping portions 85, 95 is formed to be the same, the lengths of the vehicle width direction extending portions 90L, 90R also become the same. Therefore, according to the above configuration, the rubber hoses 86, 88, 98, 100 of the front wheel brake piping systems 82L, 82R can be made common, and further, the time lag in the start timing of braking applied to the two front wheels 2L, 2R can be suppressed.

[0070] In this embodiment, the branching portion 80 is disposed in the center in the vehicle width direction. According to this configuration, since the branching portion 80 is positioned in the center in the vehicle width direction, the amount of deflection of the vehicle width direction extension portions 90L, 90R of the front wheel brake piping systems 82L, 82R can be balanced on both sides, which suppresses unevenness in hydraulic pressure loss and further suppresses the time lag in the start timing of braking applied to the two front wheels 2L, 2R.

[0071] In this embodiment, each of the suspensions 50L, 50R includes a suspension 54L, 54R, respectively. In the suspension 50L having the low flexibility piping section 101, the suspension 54L is provided between the front wheel 2L and the low flexibility piping section 101. According to this configuration, stones, mud, and the like kicked up by the front wheel 2L can be prevented from hitting the low flexibility piping portion 101 by the suspension 54L.

[0072] In the present embodiment, each suspension device 50L, 50R includes a swing arm 52L, 52R, and in each suspension device 50L, 50R, the swing arms 52L, 52R, suspensions 54L, 54R, and front wheel braking devices 66L, 66R are configured similarly to one another. According to this configuration, the suspension devices 50L, 50R arranged in the vehicle width direction can share parts, so that the vehicle 1 can be configured simply. In addition, because the parts can be shared, it is easy to suppress manufacturing costs. Conversely, the configuration of this embodiment is useful when sharing parts between the suspension devices 50L, 50R.

[0073] In this embodiment, the low flexibility piping section 101 has a metal pipe 102 (metal piping). According to this configuration, a part of the front wheel brake piping system 82L can be formed by the metal pipe 102 capable of suppressing the occurrence of hydraulic pressure loss, and in both front wheel brake piping systems 82L, 82R, the overall lengths of the flexible piping parts 85, 95 are formed to be the same, so that uneven deformation of the flexible piping parts 85, 95 between the front wheel brake piping systems 82L, 82R can be suppressed, and unevenness in hydraulic pressure loss can be reduced. Therefore, according to the above configuration, when the front wheel brake devices 66L, 66R are provided on the same side of the two front wheels 2L, 2R arranged side by side in the vehicle width direction, it is possible to suppress the time lag in the start timing of braking applied to the two front wheels 2L, 2R.

[0074] [Other embodiments] The above-described embodiment merely shows one aspect of the present invention, and any modification and application can be made without departing from the spirit and scope of the present invention.

[0075] [Other embodiments] The above-described embodiment merely shows one aspect of the present invention, and any modification and application can be made without departing from the spirit and scope of the present invention.

[0076] In the above embodiment, the configuration in which the front wheel brake devices 66L, 66R are provided on the left side of the front wheels 2L, 2R (one side in the vehicle width direction) has been exemplified, and the configuration in which the front wheel brake device 66L is provided on the outer side of the left front wheel 2L of the vehicle 1 and the front wheel brake device 66R is provided on the inner side of the right front wheel 2R of the vehicle 1 has been exemplified, but these positions may be reversed. In other words, the front wheel brake devices 66L, 66R may be provided on the right side of the front wheels 2L, 2R (the other side in the vehicle width direction).

[0077] In the above embodiment, an example is given of a configuration in which the low-flexibility piping section 101 is composed of a single metal pipe 102 having a bent section 104, but the configuration of the low-flexibility piping section 101 is not limited to this and may be composed of two or more metal pipes.

[0078] Metal pipes may be provided so that the overall lengths of the flexible portions of the front wheel brake piping systems 82L, 82R are equal. Thus, for example, a flare pipe may be included in the right front wheel brake piping system 82R. In this case, for example, a further joint may be provided behind the one-side joint 84, and the one-side joint 84 and the rear joint may be connected by a metal pipe. In this way, the shape of the metal pipe and the method of installation may be changed as appropriate.

[0079] In the above embodiment, a configuration in which a pair of left and right front wheels 2L, 2R are provided has been exemplified, but a pair of left and right rear wheels 3 may also be provided. In the above embodiment, the front wheel braking devices 66L, 66R are illustrated as drum brakes, but may be disc brakes. In the above embodiment, the branching portion 80 is provided away from the pressure modulator 4 , but it may be provided directly inside the pressure modulator 4 . In the above embodiment, the flexible piping section 95 of the left front wheel brake piping system 82L is composed of two rubber hoses, the first left rubber hose 98 and the second left rubber hose 100. The number of rubber hoses is not limited and may be one, or three or more. Similarly, the number of low flexibility piping sections 101 may be one or more.

[0080] It is sufficient that the overall lengths of the flexible piping included in the left front wheel brake piping system 82L and the right front wheel brake piping system 82R are similar. Insofar as this is the case, for example, the positions of the one-side joint portion 84, the other-side joint portion 94, and the one-side joint portion 96, which are examples of joint portions, can be changed as appropriate. Also, the number of joint portions can be changed as appropriate.

[0081] The other-side joint part 94, the one-side joint part 96, and the one-side joint part 84 may be either a joint inserted into the output pipe or a joint into which the pipe is inserted, or other types of joints may be used. Also, the other-side joint part 94, the one-side joint part 96, and the one-side joint part 84 may be a rotatable joint. Also, two manual brake levers may be provided on the sides of the seat 40, one for the front wheels 2L, 2R, and the other for the rear wheel 3. In this case, the driving unit 8 receives an operation input of the manual brake lever and also brakes the front wheels 2L, 2R and the rear wheel 3. Note that the number of manual brake levers is not limited to this, and the positions thereof are not limited either.

[0082] The low flexibility piping section 101 is not limited to being constituted by the metal pipe 102, and may be constituted by a pipe that is less flexible than the flexible piping sections 85, 95 and is less likely to deform even when the liquid pressure changes. For example, the metal pipe 102 may be a flexible hose made of metal, a highly elastic hose made of rubber, or the like.

[0083] [Configuration supported by the above embodiment] The above embodiment supports the following configurations.

[0084] (Configuration 1) A vehicle including a body frame, two wheels arranged side by side in the vehicle width direction, suspension devices provided for each of the wheels and suspending the wheels on the body frame, brake devices provided for each of the two wheels, a hydraulic control device that controls the hydraulic pressure of oil sent to the brake devices, a branching section that branches the oil, and a brake piping system provided for each of the brake devices and connecting the brake devices and the branching section, wherein the brake devices are provided on the same side in the vehicle width direction for each of the wheels, the brake piping system includes flexible piping sections that have flexibility, at least any of the brake piping systems includes a low-flexibility piping section that is less flexible than the flexible piping section, and in each of the brake piping systems, the overall length of the flexible piping section included in each of the brake piping systems is formed to be the same length. According to this configuration, since the overall length of the flexible piping parts is the same in each brake piping system, uneven deformation of the flexible piping parts between the brake piping systems can be suppressed, and unevenness in hydraulic pressure loss can be reduced. Therefore, according to the above configuration, when the brake devices are provided on the same side of two wheels arranged side by side in the vehicle width direction, the time lag in the start timing of braking applied to the two wheels can be suppressed.

[0085] (Configuration 2) The vehicle described in Configuration 1, wherein at least any of the flexible piping sections has a plurality of flexible pipings, and among the plurality of flexible pipings, a first of the plurality of flexible pipings is a vehicle width direction extending portion extending in the vehicle width direction from the branch portion to a joint portion provided in the suspension device, and a second of the flexible pipings is a front-rear direction extending portion extending in the vehicle front-rear direction from the joint portion provided in the suspension device to the brake device, and the vehicle width direction extending portion has a greater deflection than the front-rear direction extending portion. According to this configuration, while the longitudinal extension of the brake piping system is fixed, the transverse extension can be vibrated in response to the vertical vibration of the suspension. This makes it easier to vibrate the transverse extension only in the space extending in the transverse direction of the vehicle, and reduces the longitudinal vibration space. This reduces the vibration space of the brake piping system. If the front brake piping system were configured with a single rubber hose for each front brake device, the hose would extend diagonally from the branching point to the front brake device, resulting in a large vibration space for the front brake piping system.

[0086] (Configuration 3) The vehicle described in configuration 2, wherein at least one of the brake piping systems includes a first joint portion to which the vehicle width direction extension portion is connected, a second joint portion to which the front-rear direction extension portion is connected, and the low-flexibility piping portion connecting the first joint portion and the second joint portion. With this configuration, the connection position of the vehicle width direction extending portion extending from the branching portion can be separated from the connection position of the front-rear direction extending portion extending from the brake device while suppressing the occurrence of hydraulic pressure loss, thereby allowing freedom in the layout of at least one of the brake piping systems.

[0087] (Configuration 4) The vehicle described in configuration 3, characterized in that each of the flexible piping sections has a plurality of flexible piping sections, the other of the brake piping systems includes the joint section to which the vehicle width direction extending section is connected and to which the front-rear direction extending section is connected, and the joint section, the first joint section, and the second joint section are arranged at the same position in the front-rear direction of the vehicle body. According to this configuration, the length of the front-rear extending portion can be made the same as that of the other brake piping system while making the other brake piping system more compact than the one brake piping system. In this case, since the overall length of the flexible piping portion is formed to be the same, the length of the vehicle width extending portion is also the same. Therefore, according to the above configuration, the flexible piping of the brake piping systems can be made common and the time lag in the start timing of braking applied to the two wheels can be suppressed.

[0088] (Configuration 5) The vehicle according to configuration 4, wherein the branching portion is disposed in the center in the vehicle width direction. According to this configuration, the branching portion is positioned in the center in the vehicle width direction, so that the amount of deflection of the vehicle width extending portions of the brake piping systems can be balanced on both sides, which suppresses uneven hydraulic pressure loss and reduces the time lag in the start timing of braking applied to the two wheels.

[0089] (Configuration 6) A vehicle described in any one of configurations 1 to 5, characterized in that each of the suspension devices is equipped with a suspension, and in the suspension device having the low-flexibility piping section, the suspension is provided between the wheel and the low-flexibility piping section. According to this configuration, the suspension can prevent stones, mud, and the like kicked up by the wheels from hitting the less flexible piping portion.

[0090] (Configuration 7) The vehicle described in configuration 6, wherein each of the suspension devices includes a swing arm, and in each of the suspension devices, the swing arm, the suspension, and the brake device are configured similarly to one another. According to this configuration, the suspension devices arranged in the vehicle width direction can share components, so that the vehicle can be constructed simply.

[0091] (Configuration 8) The vehicle according to any one of configurations 1 to 7, wherein the low flexibility piping portion has a metal piping. According to this configuration, a part of the brake piping system can be formed of metal piping that can suppress the occurrence of hydraulic pressure loss, and in each brake piping system, the overall length of the flexible piping section is formed to be the same, so that uneven deformation of the flexible piping section between the brake piping systems can be suppressed and uneven hydraulic pressure loss can be reduced. Therefore, according to the above configuration, when the front wheel brake devices are provided on the same side of two front wheels arranged side by side in the vehicle width direction, the time lag in the start timing of braking applied to the two front wheels can be suppressed. [Explanation of symbols]

[0092] 1 vehicle 2L front wheel (wheel) 2R front wheel (wheel) 4. Pressure Modulator (Hydraulic Control Device) 5 Body frame (body) 50L suspension system 50R suspension system 52L Swingarm 52R Swingarm 54L Suspension 54R Suspension 66L Front wheel brake system (Brake system) 66R Front wheel brake device (Brake device) 80 Branch 82L Front wheel brake piping system (Brake piping system) 82R Front wheel brake piping system (Brake piping system) 84 One side joint part (joint part) 85 Flexible piping section 86 First right rubber hose (first flexible piping, flexible piping) 88 Second right rubber hose (second flexible piping, flexible piping) 90L Vehicle width extension 90R Vehicle width extension 92L Anteroposterior extension part 92R Anteroposterior extension part 94 Other side joint part (first joint part, joint part) 95 Flexible piping section 96 One side joint part (second joint part, joint part) 98 1st left rubber hose (1st flexible piping, flexible piping) 100 Second left rubber hose (second flexible piping, flexible piping) 101 Low flexibility piping section 102 Metal pipes (metal piping) P0 position

Claims

1. a vehicle including a body frame (5), two wheels (2L, 2R) arranged side by side in a vehicle width direction, suspension devices (50L, 50R) provided for each of the wheels (2L, 2R) and suspending the wheels (2L, 2R) from the body frame (5), brake devices (66L, 66R) provided for each of the two wheels (2L, 2R), a hydraulic control device (4) that controls the hydraulic pressure of oil sent to the brake devices (66L, 66R), a branching section (80) that branches the oil, and brake piping systems (82L, 82R) provided for each of the brake devices (66L, 66R) and connecting the brake devices (66L, 66R) to the branching section (80), The brake devices (66L, 66R) are provided on the same side in the vehicle width direction with respect to the respective wheels (2L, 2R), The brake piping system (82L, 82R) includes a flexible piping portion (85, 95) having flexibility, At least one of the brake piping systems (82L, 82R) includes a low-flexibility piping section (101) having a lower flexibility than the flexible piping section (85, 95), In each of the brake piping systems (82L, 82R), the entire length of the flexible piping portion (85, 95) included in each of the brake piping systems (82L, 82R) is formed to be the same. A vehicle characterized by:

2. At least one of the flexible piping sections (85, 95) has a plurality of flexible pipings (86, 88, 98, 100), Among the plurality of flexible pipes (86, 88, 98, 100), a first flexible pipe (86, 98) is a vehicle width direction extending portion (90L, 90R) extending in the vehicle width direction from the branch portion (80) to a joint portion (84, 94) provided in the suspension device (50L, 50R), and a second flexible pipe (88, 100) is a front-rear direction extending portion (92L, 92R) extending in the vehicle front-rear direction from a joint portion (84, 96) provided in the suspension device (50L, 50R) to the brake device (66L, 66R), The vehicle width direction extending portion (90L, 90R) is deflected more than the front-rear direction extending portion (92L, 92R).

2. The vehicle according to claim 1 .

3. At least one of the brake piping systems (82L) includes a first joint portion (94) to which the vehicle width direction extending portion (90L) is connected, a second joint portion (96) to which the front-rear direction extending portion (92L) is connected, and the low flexibility piping portion (101) connecting the first joint portion (94) and the second joint portion (96).

3. The vehicle according to claim 2.

4. Each of the flexible piping sections (85, 95) has a plurality of flexible pipings (86, 88, 98, 100), the other brake piping system (82R) includes the joint portion (84) to which the vehicle width direction extending portion (90R) is connected and to which the front-rear direction extending portion (92R) is connected, The joint portion (84), the first joint portion (94), and the second joint portion (96) are disposed at the same position (P0) in the vehicle body front-rear direction.

4. The vehicle according to claim 3.

5. The branch portion (80) is disposed in the center in the vehicle width direction.

5. The vehicle according to claim 4.

6. Each of the suspension devices (50L, 50R) includes a suspension (54L, 54R), In the suspension system (50L) having the low flexibility piping section (101), the suspension (54L) is provided between the wheel (2L) and the low flexibility piping section (101). A vehicle according to any one of claims 1 to 5.

7. Each of the suspension devices (50L, 50R) includes a swing arm (52L, 52R), In each of the suspension devices (50L, 50R), the swing arm (52L, 52R), the suspension (54L, 54R), and the brake device (66L, 66R) are configured similarly to each other.

7. The vehicle according to claim 6.

8. The low flexibility piping portion (101) has a metal piping (102). A vehicle according to any one of claims 1 to 5.

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