JP4183164B2 - Rear wheel braking device for saddle riding type vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively buffer impact force applied to a vehicle body side through a rear arm and a rear wheel from a travel road surface side during traveling of a vehicle. <P>SOLUTION: The vehicle 1 has a disc brake 41 capable of braking the rear wheel 8; and a brake hose 43 extending along the upper face of the rear arm 5, supplying pressure oil to the disc brake 41. A caliper 47 of the disc brake 41 is formed with an oil reception port 59 communicating the caliper 47 with a rear end part of the brake hose 43, and an air vent port 60 discharging air inside the caliper 47 to the outside, such that the respective ports 59, 60 open to the front side. The oil reception port 59 is disposed below the air vent port 60, and an air vent valve 62 freely opening and closing the air vent port 60 is provided. The oil reception port 59 and the air vent port 60 are formed such that respective hole centers 63, 64 of the oil reception port 59 and the air vent port 60 extend along the longitudinal direction of the upper face of the rear arm 5 in a side view of a vehicle body 2. <P>COPYRIGHT: (C)2003,JPO

Description

[0001]
[Technical field to which the invention belongs]
  The present invention relates to a rear wheel braking device for a saddle-ride type vehicle including a hydraulic caliper, a brake hose that communicates with the caliper and supplies pressure oil to the caliper, and an air vent valve attached to the caliper. is there.
[0002]
[Prior art]
  A conventional rear wheel braking device for the saddle type vehicle is disclosed in Japanese Patent Laid-Open No. 8-2472.
[0003]
  According to the above publication, a motorcycle that is a saddle-ride type vehicle is disposed behind the vehicle body frame and extends in the front-rear direction, and the front end portion of the motorcycle is swingable up and down. The rear arm is pivotally supported, a shock absorber is provided so as to straddle the vehicle body frame and the rear arm, and a rear wheel is supported on the rear end of the rear arm.
[0004]
  In addition, the motorcycle includes a disc brake that allows the rear wheel to be braked by operating the pressure oil supplied from the brake operation unit when the stepping type brake operation unit is braked, and the upper surface of the rear arm. A brake hose that extends in the front-rear direction and flows the pressure oil from the front end side toward the rear end side and supplies the pressure oil to the disc brake, and is supported by the rear arm. The disc brake caliper is formed so that an oil receiving port for communicating the rear end portion of the brake hose and an air vent port for discharging the air in the caliper to the outside are opened forward, respectively. The inlet is disposed below the air vent and an air vent valve is provided to open and close the air vent.
[0005]
  When the motorcycle is traveling, when an impact force is applied from the traveling road surface side to the vehicle body frame side via the rear wheel and the rear arm, the rear wheel and the rear arm swing up and down integrally. The impact force is relieved by interlocking the shock absorber.
[0006]
  If the braking operation section is braked while the motorcycle is running, the pressure oil from the braking operation section is supplied to the caliper through the brake hose, the caliper brakes, and the rear wheels are braked. Thus, the motorcycle is braked.
[0007]
  When air accumulates in the caliper, the performance of braking by the caliper decreases due to the compressibility of the air. Therefore, the air vent valve is operated to open, and the air in the caliper is discharged to the outside through the air vent.
[0008]
[Problems to be solved by the invention]
  By the way, in the above-mentioned conventional technology, each core of the oil receiving port and the air vent port has a large elevation angle with respect to the upper surface of the rear arm.in frontAlong with this, the rear end of the brake hose communicated with the oil receiving port and the air vent valve that opens and closes the air vent are both greatly separated from the upper surface of the rear arm. It protrudes upward.
[0009]
  For this reason, since the vertical dimension of the space above the rear arm is narrowed by the air vent valve, when this space is used and the rear arm swings up and down with the caliper and the air vent valve, it can swing. The range tends to be narrowed by the above-described narrow space, which is a cause of hindering the effect of reducing the impact force by the shock absorber, and is not preferable.
[0010]
  On the other hand, in order to facilitate the opening / closing operation of the air vent valve, the air vent valve is positioned so as to be separated upward from the rear end portion of the brake hose so that the operation is performed below the air vent valve. It is conceivable to secure a large working space for the purpose.
[0011]
  However, with the above configuration, the air vent valve protrudes further upward, further reducing the vertical dimension of the space above the rear arm and further reducing the swingable range of the rear arm. Thus, it is not preferable to position the air vent valve at a higher position. For this reason, even if the air vent valve is to be operated easily, there is a problem that this cannot be easily performed.
[0012]
  The present invention has been made paying attention to the above situation. When the rear arm swings up and down with a caliper and an air vent valve attached to the caliper while the vehicle is running, the rear arm An object of the present invention is to more effectively reduce the impact force that is applied to the vehicle body frame side from the traveling road surface side through the rear wheel and the rear arm by increasing the swingable range of the vehicle.
[0013]
  It is another object of the present invention to make it easy to operate the open / close valve of the air release valve that allows the air release port of the caliper to be opened and closed.
[0014]
[Means for Solving the Problems]
  A rear wheel braking device for a saddle riding type vehicle according to the present invention for solving the above-described problems is as follows. In addition, the code | symbol attached | subjected to each term in this term does not limit and interpret the technical scope of this invention to the content of the term of the "embodiment of invention" mentioned later.
[0015]
  The invention according to claim 1 is a rear arm 5 which is disposed behind the vehicle body frame 3 and extends in the front-rear direction, the front end of which is pivotally supported by the vehicle body frame 3 so that the rear side thereof is swingable up and down. A rear wheel 8 supported on the rear end portion of the rear arm 5, a disc brake 41 that is actuated by pressure oil supplied from outside and capable of braking the rear wheel 8, and a longitudinal direction along the upper surface of the rear arm 5 A brake hose 43 that extends to the disc brake 41 and supplies the pressure oil to the disc brake 41, and communicates a rear end portion of the brake hose 43 with a caliper 47 of the disc brake 41 supported by the rear arm 5. 59 and an air vent 60 for discharging the air in the caliper 47 to the outside are formed so as to open forward, and the oil receiving port 59 is formed in the air vent. Disposed below the mouth 60, the wheel brake after the straddle-type vehicle provided with a purge valve 62 to freely open and close the air vent opening 60,
[0016]
  When the vehicle body 2 is viewed from the side, the oil receiving port 59 and the air vent port 60 are arranged so that the hole centers 63 and 64 thereof are in the longitudinal direction of the upper surface of the rear arm 5.Almost parallelMolded to extend,
[0017]
  carIn the side view of the body 2, the hole core 64 of the air vent port 60 gradually approaches the hole core 63 of the oil receiving port 59 as it goes forward.
[0018]
  Claim2The invention of claim1'sIn addition to the invention, the oil receiving port 59 is located in front of the air vent 60.
[0019]
  Claim3The invention of claim 1Or 2In addition to the invention, a hose joint 44 for communicating the rear end portion of the brake hose 43 with the oil receiving port 59 is provided. After the hose joint 44 extends downward from the oil receiving port 59 side, A bent pipe 68 is provided that bends so that the extended end portion is directed forward and communicates the rear end portion of the brake hose 43 with the extended end portion.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
  1 to 5, reference numeral 1 denotes a straddle-type vehicle exemplified by a motorcycle, and an arrow Fr indicates the front of the vehicle 1. The left and right described below refer to the width direction of the vehicle body 2 of the vehicle 1 facing forward.
[0022]
  The vehicle 1 is arranged at a vehicle body frame 3 constituting a skeleton of the vehicle body 2, a front wheel supported on a front end portion of the vehicle body frame 3 via a front fork (not shown), and a lower rear portion of the vehicle body frame 3. And a rear arm 5 whose front end is pivotally supported by a pivot shaft 4 at the lower portion of the body frame 3 so that its rear side is swingable up and down, and a shaft extending in the width direction of the body 2. A rear wheel 8 supported by an axle 7 at the rear end of the rear arm 5 so as to be rotatable around the center 6, and a shock absorber laid across the body frame 3 and the rear arm 5. The vehicle body 2 is supported on the traveling road surface by the front wheels and the rear wheels 8.
[0023]
  Further, the vehicle 1 includes a driving device 10 for driving driving supported by the vehicle body frame 3, a chain winding type interlocking mechanism 11 for interlockingly connecting the rear wheel 8 to the driving device 10, and the vehicle 1. And a braking device 12 for braking the vehicle.
[0024]
  The rear arm 5 constitutes a front end portion of the rear arm 5 and is pivotally supported on the vehicle body frame 3 by the pivot shaft 4 and a pair of left and right arm members 16 projecting rearward from the base portion 15. , 16 and the upper surface of each arm member 16 of the rear arm 5 extends substantially linearly in the front-rear direction in a side view of the vehicle body 2, and the arm members 16, 16 can swing up and down as described above. A. A long hole 17 is formed in the rear end of each arm member 16 so as to penetrate in the width direction of the vehicle body 2 and to be long in the front-rear direction. The end portions of the axle 7 are fitted in the long holes 17 so as to be movable back and forth. The axle 7 is held at a predetermined position in the front-rear direction by a take-up device 18 supported by the arm members 16. It is supported by each arm member 16.
[0025]
  The rear wheel 8 is supported by a support device 20 in the middle portion in the axial direction of the axle 7 between the left and right arm members 16, 16. The rear wheel 8 includes a hub 21 positioned on the shaft center 6 and tires supported by the hub 21 by spokes 22. The support device 20 includes a pair of left and right bearings 25 and 25 for supporting the hub 21 of the rear wheel 8 so as to be rotatable about the axis 6 with respect to the middle portion of the axle 7, and the axle 7. First to third collars 26 to 28 are provided.
[0026]
  The first collar 26 is interposed between the left arm member 16, which is one side in the width direction of the vehicle body 2, and the left bearing 25. The second collar 27 is interposed between the left and right bearings 25 and 25. The third collar 28 is interposed between the right arm member 16 which is the other side and the right bearing 25. The bearing device 20 is externally fitted to the axle 7 and has a washer 29 interposed between the left arm member 16 and the first collar 26, each end of the hub 21 and the first and first members. A ring-shaped space between the three collars 26 and 28 is provided with a pair of left and right dust seals 30 and 30 that close the ring-shaped space from the outside.
[0027]
  The drive device 10 includes an internal combustion engine supported by the vehicle body frame 3, a gear speed reduction type power transmission device 33 connected to the internal combustion engine, and an exhaust pipe 34 that extends from the internal combustion engine and guides exhaust gas. The exhaust pipe 34 is positioned above the arm member 16 on the right side of the rear arm 5 and extends substantially horizontally toward the rear.
[0028]
  The interlocking mechanism 11 includes a driving chain wheel attached to the output shaft of the power transmission device 33, a driven chain wheel 37 supported by a fastener on the left side of the hub 21 of the rear wheel 8, and the driving chain wheel. And an endless chain 38 wound around the driven chain wheel 37.
[0029]
  The brake device 12 is actuated by pressure oil supplied from the outside to allow the rear wheel 8 to be braked, and the disc is supported by the vehicle body frame 3 based on a braking operation by a rider's stepping. A brake operating section 42 that supplies pressure oil to the brake 41, and extends in the front-rear direction along the upper surface of the rear arm 5, and causes the pressure oil to flow from the front end toward the rear end. A brake hose 43 to be supplied to the brake 41 and a hose joint 44 for connecting the rear end portion of the brake hose 43 to the disc brake 41 are made of resin and flexible, and the hose joint 44 is made of metal.
[0030]
  The disc brake 41 is disposed in the vicinity of a brake disc 45 supported by a fastener on the right side portion of the hub 21 of the rear wheel 8 on the shaft center 6 and the rear upper portion of the right arm member 16 of the rear arm 5. The arm member 16 includes a caliper 47 that is supported by a bracket 46 and is operated by the pressure oil so that the outer edge of the brake disc 45 can be clamped.
[0031]
  A through hole 49 is formed on the shaft 6 in a part of the bracket 46, and the through hole 49 and the axle 7 are fitted. A locking tool 50 is provided for locking the other portion of the bracket 46 when the axle 7 and the through hole 49 are fitted to the arm member 16 on the right side of the rear arm 5. The bracket 46 is prevented from trying to rotate around the axis 6 of the axle 7. That is, the bracket 46 is supported on the arm member 16 of the rear arm 5 by the axle 7 and the locking member 50.
[0032]
  On the other hand, in a state where the axle 7 and the through hole 49 are not fitted, the bracket 46 can be detachably locked to the arm member 16 of the rear arm 5 by the locking tool 50. In this case, the bracket 46 can assume the same posture at the same position as when the bracket 46 is supported by the arm member 16 of the rear arm 5 as described above.
[0033]
  The axle 7 is a bolt-shaped axle that is detachably fitted to each arm member 16, each bearing 25, each of the first to third collars 26 to 28, the washer 29, each dust seal 30, and the bracket 46 of the rear arm 5. A main body 52 and a nut 53 to be screwed to the threaded portion of the axle main body 52 are provided. By screwing the nut 53, the arm members 16 of the rear arm 5 and the inner parts of the bearings 25 are formed on the shaft 6. The race, the first to third collars 26 to 28, the washer 29, and the pivot shaft 40 are fixed to each other and integrated.
[0034]
  The caliper 47 is fitted into the housing 55 supported by the bracket 46 with a fastener, and is fitted into the housing 55 so as to be slidable in the width direction of the vehicle body 2, and is arranged to face the outer edge of the brake disc 45. And a pad 57 interposed between the outer edge of the brake disc 45 and the piston 56.
[0035]
  An oil receiving port 59 for communicating the rear end portion of the brake hose 43 with the front portion of the housing 55 of the caliper 47, and an upper portion such as a space surrounded by the inner surface of the housing 55 and the piston 56 in the caliper 47. An air vent 60 for discharging the air accumulated in the space to the outside of the caliper 47 is formed, and the oil receiving port 59 and the air vent 60 are formed to open forward.
[0036]
  The oil receiving port 59 is disposed near the lower side of the air vent 60, and the oil receiving port 59 is positioned on the front side of the air vent 60. Further, a screw type air vent valve 62 is provided that allows the air vent port 60 to be opened and closed manually. The air vent valve 62 is disposed on the hole core 64 of the air vent port 60, and a screw portion at the rear end thereof is screwed to the inner peripheral surface of the air vent port 60, and is attached to the housing 55 of the caliper 47. A front end portion of the air vent valve 62 projects forward from the caliper 47.
[0037]
  In the side view (FIGS. 1 to 3) of the vehicle body 2 and in plan view, the oil receiving port 59 and the air vent port 60 have respective hole centers 63 and 64 in the longitudinal direction of the upper surface of the rear arm 5.Almost parallelShaped to extend. Further, the hole core 64 of the air vent 60 is gradually brought closer to the hole core 63 of the oil receiving port 59 as it goes forward, and both the hole cores 63, 64 move forward as it moves toward the rear arm 5. It gradually comes away from the top surface of the.
[0038]
  In particular, in FIG. 5, the hose joint 44 communicates the rear end portion of the brake hose 43 with the oil receiving port 59. The hose joint 44 is screwed into the oil receiving port 59 from the front side and has an oil passage 66 therein. A bolt body 67 having an upper end is fastened to the edge of the oil receiving port 59 by the bolt body 67 and extends downward from the upper end side, and then the extension end portion is bent forward. A bent pipe 68 for connecting the rear end portion of the brake hose 43 to the extended end portion is provided. The bent pipe 68 has an arc shape in a side view of the vehicle body 2, and a lower portion of the bent pipe 68 and a rear end portion of the brake hose 43 are disposed in the vicinity of the upper surface of the rear arm 5. The inside of the brake hose 43 is communicated with the oil receiving port 59 through the inner hole of the bent pipe 68 and the oil passage 66 of the bolt body 67.
[0039]
  A cover body 70 is provided to cover the rear end portion of the brake hose 43, the hose joint 44, the caliper 47, and the air vent valve 62 so as to be integrally openable from the outside thereof. 71 is detachably fastened.
[0040]
  When the braking operation portion 42 is braked, the pressure oil from the braking operation portion 42 is supplied into the caliper 47 through the brake hose 43, the hose joint 44, and the oil receiving port 59 in order. The piston 56 frictionally joins the pads 57 to the outer surface of the outer edge of the brake disc 45 by pressing. Then, when the brake disc 45 is braked, the rear wheel 8 is braked.
[0041]
  When the braking operation to the braking operation unit 42 is released, the pressure oil in the caliper 47 flows in the opposite direction to the above and is returned to the braking operation unit 42, and the braking of the brake disc 45 is released.
[0042]
  According to the above configuration, when viewed from the side of the vehicle body 2, the oil receiving port 59 and the air vent port 60 are arranged so that the hole centers 63 and 64 thereof are in the longitudinal direction of the upper surface of the rear arm 5.Almost parallelShaped to extend.
[0043]
  For this reason, as in the prior art, each hole core has a large elevation angle with respect to the upper surface of the rear arm 5.in frontCompared to the case of extending upward, the rear end portion of the brake hose 43 communicated with the oil receiving port 59 and the front end portion of the air vent valve 62 that opens and closes the air vent port 60 are connected to the rear arm 5. Large separation from the upper surface is prevented.
[0044]
  Therefore, since the space 69 above the rear arm 5 from the rear arm 5 to the exhaust pipe 34 above is prevented from being narrowed by the front end portion of the air vent valve 62, the vertical dimension of the space 69 is further increased. For this reason, when the rear arm 5 swings up and down with the caliper 47 and the air vent valve 62 using the space 69, the swingable range can be further increased. During traveling, the impact force to be applied from the traveling road surface side to the vehicle body frame 3 side via the rear wheel 8 and the rear arm 5 can be more effectively mitigated.
[0045]
  Further, as described above, as viewed from the side of the vehicle body 2, the hole core 64 of the air vent port 60 gradually approaches the hole core 63 of the oil receiving port 59 toward the front.
[0046]
  For this reason, for example, when both the hole cores 63 and 64 are parallel to each other, or when the hole core 64 of the air vent port 60 is gradually separated from the hole core 63 of the oil receiving port 59 as it goes forward. In comparison, according to the above configuration, the front end portion of the air vent valve 62 that allows the air vent port 60 to be opened and closed can be brought closer to the upper surface of the rear arm 5.
[0047]
  Therefore, the vertical dimension of the space 69 above the rear arm 5 can be further increased. For this reason, the rear arm 5 swings up and down with the caliper 47 and the air vent valve 62 using the space 69. At that time, the swingable range can be further increased, and the impact force that is applied to the vehicle body frame 3 side from the traveling road surface side through the rear wheel 8 and the rear arm 5 during traveling is more effective. Can be relaxed.
[0048]
  Further, as described above, the oil receiving port 59 is positioned in front of the air vent 60.
[0049]
  For this reason, the rear end portion of the brake hose 43 communicated with the oil receiving port 59 and the air vent valve 62 that opens and closes the air vent port 60 are displaced from each other in the front-rear direction.
[0050]
  Therefore, since the opening / closing valve operation of the air vent valve 62 can be performed without being obstructed by the rear end portion of the brake hose 43, the air vent valve 62 can be operated more easily.
[0051]
  Further, as described above, the hose joint 44 for communicating the rear end portion of the brake hose 43 with the oil receiving port 59 is provided, and after the hose joint 44 extends downward from the oil receiving port 59 side, A bent pipe 68 is provided that bends so that the extended end portion is directed forward and communicates the rear end portion of the brake hose 43 with the extended end portion.
[0052]
  For this reason, the rear end portion of the brake hose 43 is separated further downward from the air vent valve 62 by the hose joint 44.
[0053]
  Therefore, the opening / closing valve operation of the air vent valve 62 can be performed more reliably without being obstructed by the rear end portion of the brake hose 43, so that the air vent valve 62 can be operated more easily.
[0054]
  In FIG. 6, a guide surface 72 is formed at a corner portion on the rear wheel 8 side in the width direction of the vehicle body 2 at the rear end portion of the bracket 46. The guide surface 72 is a flat inclined surface that approaches the rear wheel 8 as it goes forward in plan view of the vehicle body 2 (FIG. 6).
[0055]
  When the axle 7, the rear wheel 8, the interlocking mechanism 11, the support device 20, and the disc brake 41 are assembled to the rear arm 5, first, the locking member 50 is used to fix the arm member 16 on the right side of the rear arm 5. The bracket 46 of the disc brake 41 is locked and temporarily fixed. At this time, the long hole 17 of each arm member 16 and the through hole 49 of the bracket 46 are opposed to each other in the width direction of the vehicle body 2.
[0056]
  On the other hand, the rear wheel 8 and the support device 20 are assembled to each other, and the driven chain wheel 37 and the brake disk 45 are supported by the hub 21 of the rear wheel 8 to form the assembly 73.
[0057]
  Next, the assembly 73 is inserted into the space 74 sandwiched between the arm member 16 on the left side of the rear arm 5 and the bracket 46 from the rear (two-dot chain line arrow in the figure). At this time, the outer dimensions of the assembly 73 and the space 74 in the width direction of the vehicle body 2 are substantially the same, and fitting of the assembly 73 into the space 74 tends to be complicated. However, since the guide surface 72 guides the assembly 73 during the insertion, the insertion can be performed smoothly.
[0058]
  By fitting the assembly 73 into the space 74, the axis 6 of the rear wheel 8 in the assembly 73 is aligned with the axis 6 of the through hole 49, and in this state, the axle is aligned along the axis 6. 7 and the rear wheel 8 is supported on the rear arm 5 via the axle 7, the take-up device 18, and the bearing device 20. Become. Thereafter, the chain 38 is wound while the take-up device 18 is operated, and the caliper 47 is supported by the bracket 46, and then the nut 53 is finally screwed to the axle body 52.
[0059]
  In addition, although the above is based on the example of illustration, the vehicle 1 may be a tricycle. Further, the hole cores 63 and 64 may gradually approach the upper surface of the rear arm 5 toward the front.
[0060]
【The invention's effect】
  The effects of the present invention are as follows.
[0061]
  According to a first aspect of the present invention, there is provided a rear arm that is disposed rearward of the vehicle body frame and extends in the front-rear direction, and whose front end is pivotally supported by the vehicle body frame so that the rear side can swing up and down, and the rear end of the rear arm A rear wheel supported by the part, a disc brake that is actuated by pressure oil supplied from the outside to brake the rear wheel, and extends in the front-rear direction along the upper surface of the rear arm. A brake hose for supplying to the disc brake caliper supported by the rear arm, an oil receiving port for communicating the rear end portion of the brake hose, and an air vent for discharging the air in the caliper to the outside Are formed so as to open forward, the oil receiving port is disposed below the air vent, and the air vent is configured to freely open and close the air vent. In the wheel brake after the straddle-type vehicle provided with,
[0062]
  When the vehicle body is viewed from the side, the oil receiving port and the air vent port are arranged so that each hole center is in the longitudinal direction of the upper surface of the rear arm.Almost parallelShaped to extend.
[0063]
  For this reason, as in the prior art, each hole core has a large elevation angle with respect to the upper surface of the rear arm.in frontCompared to the case of extending upward, the rear end portion of the brake hose communicated with the oil receiving port and the air vent valve that opens and closes the air vent port may be greatly separated upward from the upper surface of the rear arm. Is prevented.
[0064]
  Therefore, the space above the rear arm is prevented from being narrowed by the air vent valve, so that the vertical dimension of the space can be further increased. For this reason, the rear arm can be used for the caliper by using this space. When the vehicle swings up and down with the air vent valve, the swingable range can be made larger, and accordingly, during traveling, it tends to be given from the traveling road surface side to the vehicle body frame side through the rear wheel and the rear arm. The impact force can be mitigated more effectively.
[0065]
  AlsoIn the side view of the vehicle body, the hole center of the air vent is gradually brought closer to the hole center of the oil receiving port as it faces forward.
[0066]
  For this reason, for example, compared with the case where both the hole cores are parallel to each other, or gradually separated from the hole core of the oil receiving port as the hole core of the air vent port moves forward, The air vent valve that opens and closes the air vent can be brought closer to the upper surface of the rear arm.
[0067]
  Therefore, the vertical dimension of the space above the rear arm can be further increased. Therefore, when the rear arm swings up and down with the caliper and the air vent valve using this space, the space can be swung. The range can be further increased, and the impact force that is to be applied from the traveling road surface side to the vehicle body frame side through the rear wheel and the rear arm during traveling can be reduced more effectively.
[0068]
  Claim2In this invention, the oil receiving port is positioned in front of the air vent port.
[0069]
  For this reason, the rear end portion of the brake hose communicated with the oil receiving port and the air vent valve that opens and closes the air vent are displaced from each other in the front-rear direction.
[0070]
  Therefore, the opening / closing valve operation of the air vent valve can be performed without being obstructed by the rear end portion of the brake hose, so that the air vent valve can be operated more easily.
[0071]
  Claim3According to the present invention, a hose joint for communicating the rear end portion of the brake hose with the oil receiving port is provided, and after the hose joint extends downward from the oil receiving port side, the extended end portion is in front. A bent pipe is provided which is bent so that the rear end portion of the brake hose communicates with the extended end portion.
[0072]
  For this reason, the rear end portion of the brake hose is separated further downward from the air vent valve of the air vent by the hose joint.
[0073]
  Therefore, the opening / closing valve operation of the air vent valve can be performed more easily without being obstructed by the rear end portion of the brake hose, so that the air vent valve can be operated more easily.
[Brief description of the drawings]
FIG. 1 is a view corresponding to FIG. 3, and is a view showing a rear arm and a cover body in FIG.
FIG. 2 is a rear side view of the vehicle.
FIG. 3 is a partially enlarged view of FIG. 2;
4 is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a partially enlarged partial sectional view of FIG. 1;
6 is a development view (a cross-sectional oblique line is omitted) in plan view of what is shown in FIG. 4. FIG.
[Explanation of symbols]
  1 vehicle
  2 body
  3 Body frame
  5 Rear arm
  6 axis
  7 axles
  8 Rear wheel
  12 Braking device
  15 base
  16 Arm member
  41 Disc brake
  42 Braking operation part
  43 Brake hose
  44 Hose joint
  45 Brake disc
  46 Bracket
  47 Caliper
  59 Oil inlet
  60 Air vent
  62 Air vent valve
  63 core
  64 core
  66 Oilway
  67 Bolt body
  68 bent pipe
  69 space
  A Swing freely

Claims (3)

A rear arm that is disposed behind the body frame and extends in the front-rear direction, and whose front end is pivotally supported by the body frame so that its rear side can swing up and down, and a rear wheel that is supported by the rear end of the rear arm A disc brake that is actuated by pressure oil supplied from outside to brake the rear wheel, and a brake hose that extends in the front-rear direction along the upper surface of the rear arm and supplies the pressure oil to the disc brake. The disc brake caliper supported by the rear arm has an oil receiving port for communicating the rear end portion of the brake hose and an air vent port for discharging the air in the caliper to the outside. A straddle-type vehicle provided with an air vent valve that is shaped to perform, and that the oil receiving port is disposed below the air vent and that allows the air vent to be opened and closed. In the wheel braking device after,
In the side view of the vehicle body, the oil receiving port and the air vent port are formed such that each hole core extends substantially parallel to the longitudinal direction of the upper surface of the rear arm ,
In a side view of the vehicle body, a wheel braking device after the straddle-type vehicle so as to gradually approach the hole center of the oil receiving opening in accordance toward the Anashin of the air vent port forward. The rear wheel braking device for a saddle riding type vehicle according to claim 1, wherein the oil receiving port is positioned in front of the air vent. A hose joint that allows the rear end of the brake hose to communicate with the oil receiving port is provided. After the hose joint extends downward from the oil receiving port side, the extended end is bent forward. The rear wheel braking device according to claim 1 , further comprising a bent pipe that communicates the rear end portion of the brake hose with the extended end portion.

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