JP5422672B2 - Brake equipment for motorcycles - Google Patents

Description

The present invention relates to an improvement in a motorcycle brake device.

  In a motorcycle, when an occupant operates a brake pedal, an operation force is transmitted by a mechanical transmission member to operate a brake provided on a rear wheel (for example, Patent Document 1). reference.).

  According to Patent Document 1, when the brake pedal 1 is operated, the brake arm is rotated via the brake rod, the rear wheel brake is activated, and the rear wheel is braked.

Japanese Utility Model Publication No. 60-58596

  In order to efficiently rotate the brake arm provided on the inner side in the vehicle width direction of the rear fork shown in Patent Document 1, a brake pedal is arranged along the surface on which the brake arm rotates as much as possible, or the brake rod It is necessary to bend. Therefore, there is a demand for a structure that can reduce the number of processing steps of the brake rod and can efficiently transmit the brake operation force while making it difficult to be restricted by the position of the brake pedal.

An object of the present invention is to provide a motorcycle brake device capable of efficiently transmitting a brake operation force while increasing the degree of freedom of arrangement of brake pedals and the degree of freedom of design of components.

According to one aspect of the present invention, a swing arm in which a front end is swingably supported by a vehicle body frame and a rear wheel is rotatably supported at a rear end, a rear wheel brake operator that performs a braking operation on the rear wheel, A rear wheel drum brake that applies a braking force to the rear wheel by rotating the brake arm in accordance with the operation of the rear wheel brake operator, and a master that generates hydraulic pressure by being pressed according to the operation of the rear wheel brake operator. In a motorcycle brake device including a cylinder and a slave cylinder that is operated by a hydraulic pressure transmitted from the master cylinder via a flexible hydraulic pipe, the brake arm is offset to one side in the vehicle width direction. , is disposed in the vehicle width direction inner side of the swing arm, the slave cylinder is supported at a position located on the brake arm and the ipsilateral swing arm, the slave cylinder And the brake arm is characterized in that it is connected with the transmission rod.

  Preferably, the slave cylinder is attached to the upper surface of the swing arm via an attachment stay.

  Preferably, the lower end of the shock absorber is supported on the upper rear end of the swing arm, and the brake arm extends rearward and downward from the axle of the rear wheel provided at the rear end of the swing arm in a side view. And the transmission rod is disposed so as to incline backward and cross the swing arm.

  Preferably, the swing arm includes a pair of left and right arm members extending in the front-rear direction, the brake arm is disposed closer to the vehicle body center side than the arm member in plan view, and the slave cylinder is supported by one arm member. The cylinder axis of the slave cylinder is provided offset from the center in the vehicle width direction of one arm member toward the vehicle body center side.

  Preferably, the cylinder axis of the slave cylinder is provided offset inward from the inner edge in the vehicle width direction of one arm member in plan view.

  Preferably, the transmission rod is divided into a rod main body and an extension member extended from the rod main body, and the extension member has one end connected to the slave cylinder and the other end pivotable to one end of the rod main body. The other end of the rod body is connected to the tip of the brake arm.

  Preferably, the swing arm includes a return spring that has one end hooked on the swing arm and the other end hooked on the transmission rod to urge the transmission rod toward the non-braking side.

  Preferably, the hydraulic circuit including the flexible hydraulic pipe is provided with an interlocking device that applies a braking force to the front wheel brake in conjunction with the operation of the brake pedal. A delay valve for delaying the braking timing and a cut valve for controlling the hydraulic pressure supplied to the slave cylinder when the pressure in the flexible hydraulic pressure pipe exceeds a predetermined value are provided.

The rear wheel drum brake is arranged on the inner side in the vehicle width direction of the swing arm while being offset to one side in the vehicle width direction, and the slave cylinder is supported at a position located on the same side as the rear wheel drum brake of the swing arm, Since the slave cylinder and the brake arm are connected by the transmission rod, the rear wheel drum brake and the slave cylinder are arranged on the same side of the swing arm, so that the rear wheel drum brake brake arm and the slave cylinder are The offset amount in the width direction can be reduced. Therefore, the brake operation force can be transmitted efficiently without special processing of the brake arm.

Furthermore, since the transmission rod is provided on the swing arm via the slave cylinder and the transmission rod and the swing arm swing similarly, the transmission rod and the swing arm do not interfere with each other. The degree of freedom in designing a brake device for a motorcycle can be improved.

  In addition, since the master cylinder and the slave cylinder are connected via a flexible hydraulic pipe and the transmission rod is operated by the slave cylinder, the degree of freedom in the arrangement of the master cylinder and the brake pedal relative to the slave cylinder is increased. Can do.

  Since the slave cylinder is attached to the upper surface of the swing arm via the attachment stay, it is possible to make it less susceptible to the influence of stones and the like jumped up from the road surface with respect to the slave cylinder.

  The lower end of the shock absorber is supported on the upper rear end of the swing arm, and the brake arm is provided so as to be able to turn rearward and extend downward from the axle of the rear wheel provided at the rear end of the swing arm in a side view. At the same time, the transmission rod is arranged so as to incline backward and intersect with the swing arm, so that the brake arm extends downward to prevent interference between the brake arm and the lower end of the shock absorber, The amount of rocking of the brake arm can be ensured, and the design freedom above the swing arm, such as the degree of freedom of mounting the shock absorber, can be improved.

  The swing arm includes a pair of left and right arm members extending in the front-rear direction, the brake arm is disposed closer to the vehicle body center side than the arm member in plan view, and the slave cylinder is supported by one arm member, and the slave cylinder The cylinder axis is offset to the vehicle body center side from the vehicle width direction center of one arm member, so the offset amount in the vehicle width direction between the brake arm and the slave cylinder provided on the vehicle body center side from the swing arm The brake operation force can be transmitted efficiently.

  In plan view, the cylinder axis of the slave cylinder is offset from the inner edge in the vehicle width direction of one arm member, so that the offset amount in the vehicle width direction between the brake arm and the slave cylinder is further reduced. Therefore, the brake operation force can be transmitted more efficiently.

  The transmission rod is divided into a rod main body and an extension member extended from the rod main body. In the extension member, one end is connected to the slave cylinder and the other end is rotatably connected to one end of the rod main body. Since the other end of the rod body is connected to the tip of the brake arm, the extension member is pivotally connected to the rod body, so that the direction other than the stroke direction of the slave cylinder acting on the slave cylinder to which the extension member is connected. External force can be reduced.

  Since the swing arm is equipped with a return spring that has one end hooked on the swing arm and the other end hooked on the transmission rod to bias the transmission rod toward the non-braking side, it is transmitted by the return spring when the braking operation of the rear drum brake is released. The rod can be returned to the non-braking position.

The hydraulic circuit including the flexible hydraulic piping is equipped with an interlocking device that applies braking force to the front wheel brake in conjunction with the operation of the brake pedal, and this interlocking device provides the braking timing of the front wheel brake by operating the brake pedal. Since the delay valve for delaying and the control valve for controlling the hydraulic pressure supplied to the slave cylinder when the pressure in the flexible hydraulic piping exceeds a predetermined value, the hydraulic pressure generated in the master cylinder is provided. Thus, the front wheel brake and the rear wheel drum brake can be appropriately operated in a well-balanced manner through the interlocking device, and the motorcycle can be effectively braked with a simple structure.

1 is a side view of a motorcycle provided with a motorcycle brake device according to the present invention. FIG. FIG. 2 is a hydraulic circuit diagram of the brake device shown in FIG. 1. It is a side view of the brake device shown in FIG. It is a top view of the brake device shown in FIG. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. FIG. 4 is a cross-sectional view of a slave cylinder and a transmission rod shown in FIG. 3. FIG. 7 is a plan view of a slave cylinder and a transmission rod shown in FIG. 6. It is an operation view of the brake device according to the present invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, left, right, front, and rear indicate directions based on a driver who rides the motorcycle .

Examples of the present invention will be described. The arrow (FRONT) in the figure represents the front of the motorcycle .
As shown in FIG. 1, the motorcycle 10 is a motorcycle rear drum brake 14 is provided on the front wheel 11 wheel disc brake 12, the rear wheel 13, the head body frame 20 constitutes the front end pipe 21, a main frame 22 that extends rearward and downward from the head pipe 21, a pivot plate 23 that extends downward from the rear end of the main frame 22, and a rearward upper and rearward direction from the rear end of the main frame 22. A pair of left and right seat rails 24, 24 (only one reference numeral 24 is shown) and a main frame 22 and a sub-frame 26 attached to each of the seat rails 24, 24 are provided. A fork 31 is attached to the main frame 22 and the pivot plate 23 so as to be steerable. Engine 32 is mounted, the swing arm 34 via a pivot shaft 33 is mounted vertically swingably to the pivot plates 23.
The front fork 31 has a front handle 11 attached to an upper end via a bar handle 36 and a lower end via an axle 37.

The engine 32 is a power unit that includes a crankcase 41 and a cylinder portion 42 that protrudes forward from the crankcase 41, and a transmission 44 is integrally provided at the rear portion of the crankcase 41.
The swing arm 34 has a rear wheel 13 attached to a rear end portion via an axle 46.

  In the figure, 51 is a headlamp cover, 52 is a front cover, 53 is a leg shield, 54 is a front fender, 56 is a center cover, 57 is a seat, 58 is a grab rail, 61 is a rear side cover, 62 is a tail lamp, and 63 is a tail lamp. The rear fender, 64 is a rear cushion unit passed to the seat rail 24 and the rear end of the swing arm 34, 66 is an exhaust pipe, 67 is a muffler, 68 is a driver step, 71 is a kick pedal, 72 is a pivot plate 23 Step brackets 73 and 73 are passenger steps provided at the rear of the step bracket 72.

In FIG. 2, the brake device 80 of the motorcycle 10 (see FIG. 1) is shown by a hydraulic circuit for brake fluid.
The brake device 80 includes a front wheel operating unit 81, a front wheel disc brake 12 connected to the front wheel operating unit 81 via a brake pipe 82, and a rear wheel connected to the front wheel disc brake 12 via a brake pipe 84. The wheel operation unit 86 includes a rear wheel drum brake 14 connected to the rear wheel operation unit 86 via a transmission rod 88.

  The front wheel operation unit 81 includes a brake lever 91 and a master cylinder 92 that generates a hydraulic pressure by the operation of the brake lever 91, and is attached to the bar handle 36 (see FIG. 1). Reference numeral 93 denotes a reserve tank provided in the master cylinder 92.

  The front wheel disc brake 12 includes a brake disc 95 attached to the front wheel 11 (see FIG. 1), and a brake caliper 96 attached to the front fork 31 (see FIG. 1) to sandwich and brake the brake disc 95. Become.

  Reference numerals 96a, 96b, and 96c in the figure denote caliper cylinders that house pistons that are pressed against the brake disc 95 by the hydraulic pressure of the brake fluid. The caliper cylinders 96a and 96c are branched paths 82a that are branched in the brake caliper 96. , 82b, and the caliper cylinder 96b is connected to the brake pipe 84.

  The rear wheel operation unit 86 includes a brake pedal 102 rotatably attached to a pivot plate 23 (see FIG. 1) via a support shaft 101, and a pedal arm 103 provided integrally with the brake pedal 102. A master cylinder 104 that is coupled to the pedal arm 103 to generate hydraulic pressure by operating the brake pedal 102; a delay valve 106 that is provided integrally with the master cylinder 104 and connected to the brake pipe 84; and A pressure control valve (hereinafter referred to as “PCV”) 107 provided integrally with the master cylinder 104 and the delay valve 106 of the first cylinder 104 and the PCV 107 connected to the PCV 107 via a brake pipe 108 are generated in the master cylinder 104. Hydraulic pressure is transmitted via PCV107 Consisting slave cylinder 111.. Reference numeral 113 denotes a reserve tank connected to the master cylinder 104 via a pipe 114.

  The master cylinder 104 includes a rod 109 attached to a built-in piston, and a lower end portion of the rod 109 is connected to a distal end portion of the pedal arm 103 by a connecting pin 112 so as to be swingable.

  The delay valve 106 delays the transmission of the brake fluid pressure generated in the master cylinder 104 to the front wheel disc brake 12 when the brake pedal 102 is operated, so that the braking timing of the front wheel disc brake 12 is adjusted to the rear wheel drum brake 14. Is delayed with respect to the braking timing.

The PCV 107 controls the hydraulic pressure in the brake pipe 108 and the slave cylinder 111 (for example, when the hydraulic pressure in the master cylinder 104 exceeds a predetermined value, the hydraulic pressure is supplied to the brake pipe 108 and the slave cylinder 111. To stop).
The master cylinder 104, the delay valve 106, and the PCV 107 constitute an integrated cylinder / valve assembly 114.

  The brake pipe 84, the delay valve 106 and the PCV 107 described above are interlocking devices 110 for appropriately interlocking the braking force and the braking timing of the rear drum brake 14 and the front wheel disc brake 12 when the brake pedal 102 is operated. Is configured.

  The rear wheel drum brake 14 includes a brake panel 115, a brake shaft 116 rotatably attached to the brake panel 115, and a brake arm 117 attached to a tip end portion of the brake shaft 116. The end of the transmission rod 88 is connected to the tip.

  As shown in FIG. 3, the front end of the brake support rod 122 is swingably attached to the lower surface 34a of the swing arm 34 via a support shaft 121, and the brake panel 115 is an axle of the rear wheel 13 (see FIG. 1). 46 and the rear end portion of the brake support rod 122. Reference numeral 123 denotes a bolt for fixing the brake support rod 122 to the rear wheel drum brake 14.

The rear cushion unit 64 is attached with a bolt 127 to a cushion bracket 125 having a lower end portion 64 a attached to the upper surface 34 b of the rear end portion of the swing arm 34.
The brake shaft 116 of the rear wheel drum brake 14 is disposed on the inner side in the vehicle width direction of the swing arm 34 and in the vicinity of the rear end of the swing arm 34, and is more than the axle 46 of the rear wheel 13 and the bolt 127 of the rear cushion unit 64. It is arranged at the rear.
The brake arm 117 of the rear wheel drum brake 14 is attached to the brake shaft 116 so as to extend downward.

The cylinder / valve assembly 114 is attached to the side surface 23 a of the pivot plate 23 with two bolts 131 and 131.
The slave cylinder 111 is attached to an attachment stay 132 attached to the upper surface 34 b of the swing arm 34 with two bolts 133 and 133.

  The brake pipe 84 having one end connected to the delay valve 106 extends obliquely forward and upward from the delay valve 106, and further extends obliquely forward and upward along the upper surface of the main frame 22.

  The brake pipe 108 connecting the cylinder / valve assembly 114 and the slave cylinder 111 is made of a flexible material to absorb the swing of the slave cylinder 111 provided integrally with the swing arm 34.

The transmission rod 88 has a rod main body 136 whose rear end portion is connected to the brake arm 117, and one end portion that is swingably connected to the front end portion of the rod main body 136 and is disposed on an extension line of the rod main body 136. An extension member 137 having the other end inserted and connected into the slave cylinder 111 and a front spring hooking member 141 provided at the front end of the rod body 136 are hooked on one end, and the other end is provided on the swing arm 34. And a return spring 143 which is a tension coil spring hung on the rear spring hook member 142.
The transmission rod 88 is tilted rearward and is biased obliquely downward and rearward by the tensile force of the return spring 143.

  The step bracket 72 includes a cylinder / valve assembly 114, a mounting portion (bolts 131 and 131) of the cylinder / valve assembly 114 to the pivot plate 23, a mounting portion (mounting of the slave cylinder 111 and the slave cylinder 111 to the swing arm 34). The stay 132 and the bolts 133 and 133) are covered on the outer side, and the cylinder / valve assembly 114 and the slave cylinder 111 and their mounting portions (bolts 131 and 131, mounting stays 132 and bolts 133 and 133) are protected. doing.

As shown in FIG. 4, the swing arm 34 includes a pair of left and right cylinder members 151 and 152 that are rotatably attached to the pivot shaft 33, and front ends of the cylinder members 151 and 152 are attached to the cylinder members 151 and 152, respectively. A pair of left and right arm members 153 and 154 extending rearward from 152, and a cross member 156 that is passed and attached to the front portions of these arm members 153 and 154 so as to extend in the vehicle width direction. Reference numerals 157 and 157 are reinforcing members attached obliquely to the arm members 153 and 154 and the cross member 156, and 10A is the center of the motorcycle extending in the front-rear direction through the center in the vehicle width direction of the rear wheel 13. Is a line.

An axle 46 of the rear wheel 13 is passed to the rear portions of the left and right arm members 153 and 154 so as to extend in the vehicle width direction.
The slave cylinder 111 described above is attached to the upper surface of the right arm member 154, and the rod main body 136 and the extension member 137 constituting the transmission rod 88 are arranged so as to extend in the front-rear direction along the arm member 154.

The rear wheel 13 includes a hub 158 rotatably attached to the axle 46, and a brake panel 115 of the rear wheel drum brake 14 is disposed on the right side of the hub 158.
The muffler 67 is disposed on the rear side of the swing arm 34, on the right side of the axle 46 and the brake panel 115.

As shown in FIG. 5, the hub 158 is rotatably attached to the axle 46 via two bearings 161 and 162.
At the left side of the hub 158, a shock absorbing mechanism is provided for mitigating the impact in the rotational direction when power is transmitted from the drive sprocket provided on the output shaft of the transmission 44 (see FIG. 1) to the driven sprocket 165 via the chain. 166 is provided.

  The buffer mechanism 166 is rotatably supported by a bearing 172 attached to the first collar 171 fitted to the axle 46 and rotates on the outer peripheral surface 158b of the cylindrical protrusion 158a provided on one side of the hub 158. A power transmission member 173 that can be supported (specifically, a plurality of plate-like portions 173a integrally formed so as to extend radially on the side portion of the power transmission member 173) and one side portion of the hub 158. It comprises a plurality of recesses 158c into which plate-like portions 173a are respectively inserted, and cushioning rubbers 174 respectively accommodated in these recesses 158c.

  The plate-like portion 173a and the shock-absorbing rubber 174 described above are, for example, arranged in one recess 158c with one plate-like portion 173a and two shock-absorbing rubbers 174 sandwiched between them arranged in the circumferential direction. Yes.

  When an impact in the rotational direction acts on the power transmission member 173 from the driven sprocket 165, the power transmission member 173 and the hub 158 rotate relative to each other, and the plate-like portion 173a of the power transmission member 173 compresses the buffer rubber 174 in the circumferential direction. However, the power is transmitted to the hub 158 and the shock absorbing rubber 174 absorbs the shock so that it is not transmitted to the hub 158.

  The rear wheel drum brake 14 includes a brake panel 115, an anchor pin 181 attached to the inner surface 115a of the brake panel 115, a brake shaft 116 rotatably attached so as to penetrate the brake panel 115, and the brake shaft. A brake arm 117 attached to the outer end of 116 and an arc shape with one end swingably attached to the anchor pin 181 and the other end abutted against a cam 182 attached to the tip of the brake shaft 116 And a brake drum 158e provided on the hub 158 so as to be pressed against the brake shoe 183 when the cam 182 rotates together with the brake shaft 116.

  Another set of the anchor pin 181 and the brake shoe 183 is provided, and the inner surface of the brake drum 158e can be pressed by the two brake shoes 183. Reference numeral 185 denotes a cylindrical liner member cast into the inner peripheral portion of the brake drum 158e, and has excellent wear resistance when sliding with the brake shoe 183.

  The outer periphery of the brake panel 115 and the opening of the brake drum 158e form a labyrinth structure so that dust, dust, rainwater, etc. do not enter the brake drum 158e.

  Reference numerals 191, 192, 193 and 194 in the figure are collars, 196 and 196 are mounting bolts for mounting the driven sprocket 165 to the power transmission member 173, 197 is a seal member, and 198 is screwed into the tip of the bolt-shaped axle 46 A nut 201 is an O-ring.

As shown in FIG. 6, an extension member 137 is inserted and connected to the rear end portion of the slave cylinder 111.
The extension member 137 includes a rod member 205 connected to the slave cylinder 111, a length adjusting member 206 having one end attached to the rod member 205 so that the length can be adjusted, and the other end connected to the rod body 136. Consists of. Reference numeral 207 denotes a split pin for preventing the rod main body 136 from coming off from the other end of the length adjusting member 206.

The slave cylinder 111 includes a cylinder body 211, a piston 212 movably inserted in a cylinder hole 211a formed in the cylinder body 211, and a piston 212 for sealing a gap between the piston 212 and the cylinder hole 211a. The sealing members 213 and 214 attached to the cylinder hole 211, the closing member 216 attached to one end of the cylinder hole 211a and having a small hole 216a communicating the inside of the cylinder hole 211a with the outside, and the air in the cylinder hole 211a are removed. For this purpose, it comprises an air vent bolt 217 provided in an air vent passage 211b formed in the cylinder body 211. Reference numeral 111A denotes a cylinder axis passing through the center of the cylinder hole 211a.
A space surrounded by the cylinder hole 211a, the piston 212, and the seal members 213 and 214 is filled with brake fluid.

  The cylinder body 211 includes an air vent passage 211b, a brake fluid supply passage 211d that supplies brake fluid from the outside into the cylinder hole 211a, and a bulging portion 211f that bulges upward so as to communicate with the brake fluid passage 211d. A metal end tube 218 provided at one end of the brake pipe 108 is attached to the bulging portion 211f by a tube mounting bolt 221.

  The tube mounting bolt 221 has a communication hole formed therein so as to allow the brake fluid to flow between the end tube 218 and the brake fluid passage 211d. Reference numeral 223 denotes a retaining ring that fixes the closing member 216 to the cylinder body 211.

  The piston 212 has a spherical hole 212a at the end, and a spherical portion 206a formed on the rod member 206 of the extension member 137 is slidably fitted in the spherical hole 212a. The spherical hole 212a and the spherical portion 206a constitute a spherical plain bearing 225.

  Accordingly, the spherical plain bearing 225 allows the piston 212 and the rod member 206 to freely swing, and allows the coupling angle between the piston 212 and the rod member 206 to be allowed within a predetermined range. It is possible to prevent an unreasonable load from occurring in the direction other than the movement direction of the piston 212 between 206.

  As shown in FIG. 7, the axis 111 </ b> A of the slave cylinder 111 is a center line of the width of the arm member 154 of the swing arm 34, that is, a center line 154 </ b> A extending in the front-rear direction through the center of the arm member 154 in the vehicle width direction. In contrast, the arm member 154 is disposed on the inner side in the vehicle width direction, and further on the inner side in the vehicle width direction than the inner surface 154a of the arm member 154.

The front end portion 136a of the rod main body 136 is bent into an L shape and inserted into a rod insertion hole 137b provided in the rear end portion 137a of the extension member 137, and a split pin 207 for retaining is attached.
The axis 136 </ b> A of the rod body 136 is disposed on the inner side in the vehicle width direction than the axis 111 </ b> A of the slave cylinder 111.

  One end portion 143a of the return spring 143 is hooked on the front spring hook member 141 of the rod body 136, and the other end portion 143b of the return spring 143 is a rear spring having an L-shaped cross section attached to the inner surface 154a of the arm member 154. It is hung on the hanging member 142.

Next, the operation of the brake device 80 described above will be described.
As shown in FIG. 8, when the brake pedal 102 is stepped in the direction of arrow A, the pedal arm 103 rotates about the support shaft 101 in the direction of arrow B, and the rod 109 of the master cylinder 104 moves in the direction of arrow C. Push up.

  As a result, the piston in the master cylinder 104 moves to increase the hydraulic pressure of the brake fluid, and this hydraulic pressure is transmitted to the brake pipe 84 via the delay valve 106, and the direction of the white arrow D passes through the brake pipe 84. The front wheel disc brake 12 (see FIG. 1) is transmitted to brake the front wheel 11 (see FIG. 1), and the hydraulic pressure in the master cylinder 104 is transmitted to the brake pipe 108 via the PCV 107, and the brake pipe 108 The inside is transmitted in the direction of the white arrow E, reaches the slave cylinder 111, moves the piston in the slave cylinder 111 forward, and pulls the extension member 137 and the rod body 136 in the direction of arrow F.

  As a result, the rear-wheel drum brake 14 operates, that is, the brake arm 117 rotates in the direction of arrow G, and the brake shaft 116 and the brake shaft 116 and the cam 182 attached to the brake shaft 116 (see FIG. 5). ) Rotates, and the pair of brake shoes 183 (see FIG. 5) are spread and pressed against the brake drum 158e (see FIG. 5), whereby the rear wheel 13 (see FIG. 1) is braked.

As shown in FIGS. 1, 2, and 4, the swing arm 34 whose front end is swingably supported by the vehicle body frame 20 and the rear wheel 13 is rotatably supported at the rear end, and the rear wheel 13. A brake pedal 102 as a rear wheel brake operator for performing a braking operation of the rear wheel, a rear wheel drum brake 14 for applying a braking force to the rear wheel 13 by rotating the brake arm 117 in accordance with the operation of the brake pedal 102, a brake A master cylinder 104 that is pressed according to the operation of the pedal 102 to generate a hydraulic pressure, and a slave cylinder 111 that is operated by the hydraulic pressure transmitted from the master cylinder 104 via a brake pipe 108 as a flexible hydraulic pressure pipe. When, in the brake device 80 for a motorcycle provided with a brake arm 117, while offset to one side in the vehicle width direction, Disposed in the vehicle width direction inner side of the swingarm 34, slave cylinder 111 is supported at a position located on the same side as the brake arm 117 of the swing arm 34, and the slave cylinder 111 and the brake arm 117 is connected with the transmission rod 88 It is characterized by that.

With the above configuration, the rear wheel drum brake 14 and the slave cylinder 111 are arranged on the same side of the swing arm 34, so that the offset amount in the vehicle width direction between the brake arm 117 of the rear wheel drum brake 14 and the slave cylinder 111 can be reduced. Can be small. Therefore, the brake operation force can be efficiently transmitted without special processing of the brake arm 117.

Furthermore, since the transmission rod 88 is provided on the swing arm 34 via the slave cylinder 111 and the transmission rod 88 and the swing arm 34 swing similarly, the transmission rod 88 and the swing arm 34 do not interfere with each other. The degree of freedom in designing the swing arm 34 and the transmission rod 88, and thus the brake device 80 for a motorcycle can be improved.

  Further, since the master cylinder 104 and the slave cylinder 111 are connected via the brake pipe 108 and the transmission rod 88 is operated by the slave cylinder 111, the arrangement position of the master cylinder 104 and the brake pedal 102 with respect to the slave cylinder 111 can be freely set. The degree can be increased.

  As shown in FIG. 3 above, the slave cylinder 111 is attached to the upper surface 34b of the swing arm 34 via the attachment stay 132, so that the slave cylinder 111 is less susceptible to the influence of stones or the like jumped up from the road surface with respect to the slave cylinder 111. be able to.

  Further, the lower end of the rear cushion unit 64 as a shock absorber is supported on the upper rear end of the swing arm 34, and the brake arm 117 is located behind the axle 46 of the rear wheel 13 provided at the rear end of the swing arm 34 in a side view. Since the transmission rod 88 is disposed so as to incline rearward and intersect the swing arm 34, the brake arm 117 extends downward, so that the brake is extended. Interference between the arm 117 and the lower end of the rear cushion unit 64 can be prevented, the amount of swing of the brake arm 117 can be ensured, and the degree of freedom of design above the swing arm 34, such as the degree of freedom of mounting the rear cushion unit 64, can be secured. The degree can be improved.

  As shown in FIGS. 4 and 7, the swing arm 34 includes a pair of left and right arm members 153 and 154 extending in the front-rear direction, and the brake arm 117 is more central in the vehicle body than the arm members 153 and 154 in plan view. The slave cylinder 111 is supported by one arm member 154, and the cylinder axis 111A of the slave cylinder 111 is offset from the vehicle width direction center of the one arm member 154 toward the vehicle body center side. Therefore, the offset amount in the vehicle width direction between the brake arm 117 provided on the vehicle body center side from the swing arm 34 and the slave cylinder 111 can be further reduced, and the brake operation force can be transmitted efficiently.

  As shown in FIG. 7 above, the cylinder axis 111A of the slave cylinder 111 is provided offset from the inner edge (inner surface 154a) in the vehicle width direction of one arm member 154 in a plan view. The offset amount in the vehicle width direction between 117 and the slave cylinder 111 can be further reduced, and the brake operation force can be transmitted more efficiently.

  As shown in FIGS. 3 and 6, the transmission rod 88 is divided into a rod main body 136 and an extension member 137 extended from the rod main body 136. In the extension member 137, one end of the slave cylinder 111 is provided. The other end is connected to one end of the rod main body 136 so as to be rotatable, and the other end of the rod main body 136 is connected to the tip of the brake arm 117, so that the extension member 137 can be turned to the rod main body 136. Therefore, external force other than the stroke direction of the piston 212 acting on the slave cylinder 111 can be reduced.

  As shown in FIG. 7, the swing arm 34 has one end hooked and the other end hooked to the transmission rod 88 and the return rod 143 for urging the transmission rod 88 toward the non-braking side. When the braking operation of the brake 14 is released, the transmission spring 88 can be returned to the non-braking state by the return spring 143.

As shown in FIG. 2, the hydraulic circuit including the brake pipe 108 includes an interlocking device 110 that applies a braking force to the front wheel disc brake 12 as the front wheel brake in conjunction with the operation of the brake pedal 102. A delay valve 106 that delays the braking timing of the front wheel disc brake 12 by the operation of the brake pedal and a hydraulic pressure supplied to the slave cylinder 111 when the pressure in the brake pipe 108 exceeds a predetermined value are added to the interlocking device 110. Since the PCV 107 as a control valve to be controlled is provided, the front wheel disc brake 12 can be appropriately operated in a well-balanced manner with the rear wheel drum brake 14 via the interlocking device 110 using the hydraulic pressure generated in the master cylinder 104. can effect the motorcycle 10 (see FIG. 1) by a simple structure It can be braked.

  In this embodiment, as shown in FIG. 2, the delay valve 106 and the PCV 107 are provided integrally with the master cylinder 104. However, the present invention is not limited thereto, and the delay valve 106 and the PCV 107 are provided separately from the master cylinder 104. May be.

For example, the delay valve 106 may be provided in the middle of the brake pipe 84 and attached to the vehicle body frame 20, and the PCV 107 may be provided in the middle of the brake pipe 108 and attached to the vehicle body frame 20 or the swing arm 34.
Alternatively, the PCV 107 may be provided integrally with the delay valve 111.

  The brake device of the present invention is suitable for a motorcycle.

DESCRIPTION OF SYMBOLS 10 ... Motorcycle , 10A ... Motorcycle center line, 11 ... Front wheel, 12 ... Front wheel brake (front wheel disc brake), 13 ... Rear wheel, 14 ... Rear wheel drum brake, 20 ... Body frame, 34 ... Swing arm, 46 ... rear wheel axle, 64 ... shock absorber (rear cushion unit), 80 ... motorcycle brake device (brake device), 88 ... transmission rod, 102 ... rear wheel brake operator (brake pedal), 104 ... master cylinder, DESCRIPTION OF SYMBOLS 107 ... Control valve (pressure control valve), 108 ... Flexible hydraulic piping (brake piping), 110 ... Interlocking device, 111 ... Slave cylinder, 111A ... Cylinder axis, 117 ... Brake arm, 132 ... Installation stay, 136 ... Rod body, 137 ... Extension member, 143 ... Return spring 153,154 ... arm member, the vehicle width direction inner edge of 154a ... arm member (the inner surface).

Claims (7)

A brake device for a motorcycle ,
A swing arm whose front end is swingably supported by the body frame and whose rear wheel is rotatably supported by the rear end;
A rear wheel brake operator for performing a braking operation of the rear wheel;
A rear drum brake that applies a braking force to the rear wheel by rotating the brake arm in accordance with the operation of the rear wheel brake operator;
A master cylinder that is pressed in response to an operation of the rear wheel brake operator to generate a hydraulic pressure;
A slave cylinder that operates by hydraulic pressure transmitted from the master cylinder via flexible hydraulic piping,
The brake arm is arranged on the inner side in the vehicle width direction of the swing arm while being offset to one side in the vehicle width direction,
The slave cylinder is supported in position to position on the brake arm on the same side of the swing arm,
The slave cylinder and the brake arm are connected by a transmission rod,
The slave cylinder is a brake device for a motorcycle that is attached to an upper surface of the swing arm via an attachment stay. The swing arm has a rear end upper portion where the lower end of the shock absorber is supported, and the brake arm pivots rearward from the axle of the rear wheel provided at the rear end of the swing arm in a side view. 2. The brake device for a motorcycle according to claim 1, wherein the brake rod is provided so as to extend downward in a possible manner, and the transmission rod is disposed so as to incline rearward and cross the swing arm. The swing arm includes a pair of left and right arm members extending in the front-rear direction,
In plan view, the brake arm is disposed closer to the center of the vehicle body than the arm member,
2. The slave cylinder according to claim 1, wherein the slave cylinder is supported by one of the arm members, and a cylinder axis of the slave cylinder is offset from a vehicle width direction center of the one arm member toward a vehicle body center side. Brake equipment for motorcycles . 4. The motorcycle brake device according to claim 3 , wherein the cylinder axis of the slave cylinder is provided offset inward from a vehicle width direction inner edge of the one arm member in a plan view. 5. The transmission rod is divided into a rod main body and an extension member extended from the rod main body. One end of the extension member is connected to the slave cylinder and the other end is rotatable to one end of the rod main body. The motorcycle brake device according to claim 1, wherein the rod body is connected to the tip of the brake arm. The motorcycle brake according to claim 1, wherein the brake device includes a return spring having one end hooked on the swing arm and the other end hooked on the transmission rod to urge the transmission rod toward the non-braking side. apparatus. The brake device includes, in a hydraulic circuit including the flexible hydraulic pipe, an interlocking device that applies a braking force to a front wheel brake in conjunction with the operation of the brake pedal, and the interlocking device includes the brake pedal. A delay valve that delays the braking timing of the front wheel brake by an operation, and a control valve that controls the hydraulic pressure supplied to the slave cylinder when the pressure in the flexible hydraulic pressure pipe exceeds a predetermined value; The brake device for a motorcycle according to claim 1, comprising:

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