JP5351779B2 - Interlocking braking system for motorcycles - Google Patents

Abstract

The present invention provides an interlocked brake device for a two-wheel motorcycle. Not only is a hydraulic front wheel brake mechanism and a mechanical back wheel brake mechanism adopted, but also a structure at the periphery of a pedal is simplified. The interlocked brake device is provided with the following components: a back carriage part (15) which extends upwards from a back end of a main carriage part (13); a pivot carriage part (14) which extends downwards from a back end of the main carriage part (13); a back drum type brake (BR) which brakes a back wheel; a front disc type brake(BF) which brakes a front wheel (WF); a main hydraulic cylinder (CU) which is interlocked with the operation of a brake pedal (BP) for generating a braking force that is applied to the back drum typebrake (BR) and the front disc type brake (BF); a front tube which transmits a hydraulic force generated by the motion of the main hydraulic cylinder to the front disc type brake (BF); and auxiliary hydraulic cylinder (80) which transmits the hydraulic force generated by the motion of the main hydraulic cylinder through the back tube and functions thereby; and a mechanical transmission component which is used for transmitting the output of the auxiliary hydraulic cylinder (80) to the back drum type brake (BR), wherein the auxiliary hydraulic cylinder (80) is supported on the back carriage part(15).

Description

  The present invention relates to an interlocking braking device for a motorcycle.

2. Description of the Related Art Conventionally, a so-called interlocking brake device is known that can apply a braking force to a rear wheel braking device by operating a brake pedal, and can also apply a braking force to a front wheel braking device in conjunction with the brake pedal (for example, Patent Documents). 1).
13 and 14 in Patent Document 1, this interlocking brake device operates the brake pedal (21) to operate the rear wheel brake via the brake rod (23C). The master cylinder (M2) is pressed through the reaction force transmitting means (26D (torque rod)) to generate a hydraulic pressure, and the front wheel brake is also operated.

JP 2006-62559 A

According to the interlocking brake device described in Patent Document 1 described above, a balanced interlocking brake can be provided, but the number of parts around the pedal is increased and complicated, and the layout of the parts tends to be limited. .
On the other hand, the so-called disc brake type, in which both the front wheel braking means and the rear wheel braking means are actuated by hydraulic pressure, can simplify the surroundings of the pedal, but causes another problem of increasing costs. Become.
The problem to be solved by the present invention is to provide an interlocking braking device for a motorcycle capable of simplifying the structure around the pedal while employing mechanical rear wheel braking means.

In order to solve the above problems, a motorcycle interlock braking device of the present invention includes a main frame portion extending downward and rearward from a head pipe that supports a steering wheel in a steerable manner, and extending upward and backward from a rear end portion of the main frame portion. A vehicle body frame including a rear frame portion and a pivot frame portion extending downward from a rear end portion of the main frame portion;
A rear drum brake that brakes the rear wheels;
A front disc brake that brakes the front wheels;
A brake pedal rotatably supported on the vehicle body frame;
An interlocking brake device that generates a braking force applied to the rear drum brake and the front disc brake in conjunction with an operation of the brake pedal;
The interlocking brake device is a motorcycle interlocking braking device including a master cylinder that operates in conjunction with the operation of the brake pedal.
Front piping for transmitting the hydraulic pressure generated by the operation of the master cylinder to the front disc brake;
A slave cylinder that operates when the hydraulic pressure generated by the operation of the master cylinder is transmitted through a rear pipe;
A mechanical transmission member for transmitting the output of the slave cylinder to the rear drum brake;
The slave cylinder is supported by the rear frame portion separated from the brake pedal.
According to this motorcycle interlocking braking device, since the rear wheel brake remains a drum brake, the cost can be reduced, and the slave cylinder is supported by the rear frame portion separated from the brake pedal supported by the vehicle body frame. Therefore, the area around the brake pedal can be simplified. That is, by supporting the slave cylinder on the rear frame part, it is possible to simplify the area around the brake pedal, and the degree of freedom of layout around the brake pedal is improved.
Preferably, the mechanical transmission member is configured by a bendable brake cable, and the slave cylinder is disposed along the rear frame portion so that the axis of the slave cylinder is along the rear frame portion. The configuration.
With such a configuration, it is possible to easily support the slave cylinder by arranging the slave cylinder along the rear frame portion, and the arrangement space can be made compact. In addition, since the mechanical transmission member is a bendable brake cable, the connection work between the slave cylinder and the rear drum brake is facilitated.
More preferably, the pivot frame portion is supported at one end portion so as to be swingable, and the other end portion is provided with a swing arm for pivotally supporting the rear transportation, and the rear drum brake is pivoted at one end portion. A brake arm that can be supported is provided, and when viewed from the side, the brake cable is arranged to extend rearward after being bent forward and connected to the other end of the brake arm.
With this configuration, the brake cable can be disposed with a sufficient bending radius, so that the load on the brake cable can be reduced even when the swing arm swings. .
More preferably, the brake arm extends downward from a pivot shaft that is rotatably supported, and the brake cable is connected to the other end of the brake arm below the swing arm in a side view. The configuration is as follows.
If comprised in this way, the burden concerning a brake cable can be made still smaller.
Preferably, a vehicle body force bar is provided that covers the rear frame part with a lower edge inclined rearwardly, and the slave cylinder is disposed on the inner side in the vehicle width direction than the outer edge of the rear frame part in plan view. In addition, it is configured to be disposed inside the vehicle body force bar and above the lower edge of the vehicle body cover in a side view.
If comprised in this way, it will become possible to protect a slave cylinder from external force by arrange | positioning a slave cylinder inside a rear frame part, and covering a side with a cover. In addition, since the slave cylinder is hidden by the cover, the design can be improved.
Preferably, the interlock brake device includes a delay valve for delaying a timing of transmission to the CFC disc brake, and a hydraulic pressure to be sent to the slave cylinder when a braking force of the rear brake exceeds a predetermined value. It is set as the structure which is integrally provided with the hydraulic pressure suppression valve which suppresses.
If comprised in this way, while being able to control braking force appropriately by each valve | bulb, it can suppress that the brake pedal periphery becomes complicated by integration.

1 is a side view showing an example of a motorcycle to which an embodiment of an interlocking braking device for a motorcycle according to the present invention is applied. The side view which shows the frame structure of the same motorcycle and the principal part of an interlocking brake device. FIG. The block diagram of a brake device. 2A and 2B are views showing a cylinder unit CU in which a master cylinder 50, a delay valve 60, and a hydraulic pressure suppression valve 70 are integrated, in which FIG. 4A and 4B are views showing the slave cylinder 80, wherein FIG. 5A is a plan view, FIG. 5B is a front sectional view, FIG. 5C is a partial side view, and FIG. It is a figure which shows the holding member 120 to the swing arm 17 of the mechanical transmission member 90, (a) is a front view which shows the attachment state to the swing arm 17, (b) is a side view of figure (a).

Embodiments of a motorcycle interlocking braking device according to the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing an example of a motorcycle to which an embodiment of an interlocking braking device for a motorcycle according to the present invention is applied, and FIG. 2 shows a frame configuration of the motorcycle and a main part of the interlocking brake device. The side view and FIG. 3 are also plan views.

  As shown in FIG. 1, the motorcycle includes a main frame portion 13 extending downward and rearward from a head pipe 12 that supports a steering wheel 16 so as to be steerable, and a rear end portion 13r of the main frame portion 13 (see FIG. 2). A vehicle body frame F having a rear frame portion 15 extending upward and rearward and a pivot frame portion 14 extending downward from a rear end portion 13r of the main frame portion 13 is provided.

  A front fork 11 is supported on the head pipe 12 so as to be steerable by the handle 16, and a front wheel WF is pivotally supported at the lower end of the front tok 11. A front end portion of the swing arm 17 is supported on the pivot frame portion 14 so as to be swingable up and down by a support shaft 20, and a rear wheel WR is rotatably supported at the rear end of the swing arm 17. A rear cushion 18 is provided between the swing arm 17 and the rear frame portion 15. An engine E as a power unit is attached below the main frame portion 13, and the output of the engine E is transmitted to the rear wheel WR. A tandem-type riding seat 21 is disposed above the rear wheel WR.

  A synthetic resin vehicle body cover 22 that covers the vehicle body frame F and a part of the engine E is attached to the vehicle body frame F. The vehicle body force bar 22 includes a front and rear side cover 23 disposed on the left and right sides of the main frame portion 13, a leg shield 24 connected to the front portions of the front side covers 23 so as to cover the rider's legs from the front. The front top cover 25 connected to both leg shields 24 so as to cover the head pipe 12 from the front, and the main top connected to the front top cover 25 so as to cover the head pipe 12 from the rear side and cover the main frame portion 13 from above. A frame top cover 26, a lower side that is connected to the lower portions of the front side covers 23, extends rearward and rearward and covers the rear frame portion 15, and a rear side on which the riding seat 21 is disposed above. And a cover 28.

  A pillion step holder (hereinafter also simply referred to as a “step holder”) 30 provided with a pillion step 29 on which a passenger sitting on the rear portion of the riding seat 21 is placed is provided on the pivot frame portion 14. It is fixed so as to constitute a part.

FIG. 4 is a configuration diagram of the brake device.
As shown in FIGS. 1 and 4, the motorcycle brakes a rear drum brake BR that brakes a rear wheel WR that is rotatably supported by a vehicle body frame F, and a front wheel WF that is rotatably supported by the vehicle body frame F. The front disc brake BF, the brake pedal BP rotatably supported by the vehicle body frame F (step holder 30 in this embodiment), and the rear drum brake BR and the front disc brake in conjunction with the operation of the brake pedal BP. And an interlocking brake device CB that generates a braking force applied to the BF.

The front disc brake BF has a brake caliper 40 in which three hydraulic cylinders 41, 42, 43 are provided in parallel (the liquid used in the brake device of this embodiment is brake oil. In the specification, liquid may be described as brake oil).
Connected to the brake caliper 40 is a brake hose 45 that guides the brake hydraulic pressure output from the front wheel master cylinder MF that operates in response to an operation of a brake lever 44 (see FIG. 1) that is a front brake operation member. The brake hydraulic pressure guided by the brake hose 45 acts on the hydraulic cylinders 41 and 43 on both sides of the hydraulic cylinders 41 to 43. That is, when the brake lever 44 is operated, the hydraulic cylinders 41 and 43 are actuated, and a brake pad (not shown) is pressed against the brake disc 46 to apply a braking force to the front wheel WF (see FIG. 1).

The interlocking brake device CB includes a master cylinder 50 that operates in conjunction with the operation of the brake pedal BP, a front pipe 47 that transmits hydraulic pressure (for example, hydraulic pressure) generated by the operation of the master cylinder 50 to the front disc brake BF, A slave cylinder 80 that operates when the hydraulic pressure generated by the operation of the master cylinder 50 is transmitted through the rear pipe 81, and a mechanical transmission member 90 that transmits the output of the slave cylinder 80 to the rear drum brake BR. It has. The front pipe 47 is connected to the central hydraulic cylinder 42 in the front disc brake BF.
Further, the interlocking brake device CB has a delay valve 60 for delaying the timing of transmission to the CFC disc brake BF, and hydraulic pressure to be sent to the slave cylinder 80 when the braking force of the rear brake BR exceeds a predetermined value. A hydraulic pressure suppression valve 70 for suppression is provided integrally with the master cylinder 50.
Hereinafter, each part of the interlocking brake device CB will be sequentially described.

5A and 5B are views showing a cylinder unit CU in which the master cylinder 50, the delay valve 60, and the hydraulic pressure suppression valve 70 are integrated. FIG. 5A is a plan view and FIG. 5B is a front sectional view.
The cylinder unit CU has a block-shaped main body U1, and the master cylinder 50, the delay valve 60, and the hydraulic pressure suppression valve 70 are incorporated in the main body U1.

The master cylinder 50 is for generating a hydraulic pressure for operating the interlocking brake device CB, and includes a cylinder hole 51 provided in the main body U1 and a master piston 52 slidably accommodated in the cylinder hole 51. I have.
One end 51 b of the cylinder hole 51 is closed, and an output hydraulic pressure chamber 53 is formed between the cylinder hole 51 and the master piston 52.
A spherical head 54h provided at one end of the input rod 54 is provided on the master piston 52 so as to be pressable. A boot 54b is provided between the input rod 54 and the main body U1. As shown in FIGS. 1 and 2, the rear end portion of the brake pedal BP is rotatably supported on the lower portion of the step holder 30 by a support shaft 31 provided on the step holder 30. The tip of an arm BP1 that is integrally connected to the end and extends backward is connected to the other end of the input rod 54 by a connecting pin 54p (see FIG. 2).

Therefore, when the brake pedal BP is depressed, the master piston 52 is pushed into the side (actuation side) for reducing the volume of the output hydraulic pressure chamber 53 by the pressure of the spherical head 54h of the input rod 54, thereby the output hydraulic pressure chamber 53. The hydraulic pressure is output from. A communication hole 56 is communicated with the output hydraulic pressure chamber 53, and the hydraulic pressure is transmitted to the downstream side (delay valve 60, hydraulic pressure suppression valve 70 side) through the communication hole 56.
The brake pedal BP is provided with a spring (not shown) for returning the brake pedal BP to its original position when the depression operation is released, and as shown in FIG. 53, a compression spring 55 is provided between one end 51b of the cylinder hole 51 and the master piston 52 via a spring receiver 55b. The spring 55 directs the master piston 52 toward the non-operating side (original position). Always energized. Therefore, when the depression operation of the brake pedal BP is released, the brake pedal BP returns to the original position, and the master piston 52 also returns to the original position (position shown in FIG. 5B).

The delay valve 60 is for delaying the operation timing of the front wheel brake BF via the front pipe 47 with respect to the operation of the brake pedal BP. The delay valve 60 is provided between the communication hole 56 and the front pipe 47 (see FIG. 4). Is provided.
The delay valve 60 includes a storage hole 61 provided in the main body U1 in parallel with the cylinder hole 51, and a piston 62 slidably stored in the storage hole 61.

The storage hole 61 has a small-diameter portion 61s communicating with the communication hole 56 and a large-diameter portion 61m that forms a liquid chamber, and an end of the large-diameter portion 61m is closed by a cylindrical guide member 63. Further, the outer end is covered with a lid 64.
The piston 62 has a head portion 62h and a rod portion 62r integrated with the head portion 62h. The head portion 62h is slidably fitted into the small diameter portion 61s of the storage hole 61, and the rod portion 62r is guided by the guide portion 62h. The member 63 is slidably fitted in a guide hole 63g provided at the center of the member 63.

  A compression spring (piston biasing spring) 65 is provided between the bottom surface of the guide hole 63g and the rod portion 62r, and the piston 62 is always attached toward the protruding side (communication hole 56 side) by this spring 65. However, a step portion 61d1 is provided at the tip of the small diameter portion 61s of the storage hole 61, and the head portion 62h abuts on the step portion 61d1 to bring the piston 62 toward the communication hole 56 side. Protrusion is restricted.

A ring-shaped step portion 61d2 between the small-diameter portion 61s and the large-diameter portion 61m is provided with a ring-shaped concave channel 66r concentric with the step portion 61d2, and the ring-shaped channel 66r The orifice 66o communicates with the communication hole 56. On the other hand, a ring-shaped valve body 67 is provided around the rod portion 62r so as to contact the stepped portion 61d2 and close the ring-shaped flow channel 66r.
A compression spring (valve spring) 67s is provided between the valve body 67 and the guide member 63 via a spring receiver 67c, and the valve body 67 closes the ring-shaped channel 66r by the valve spring 67s. The hydraulic pressure generated in the output hydraulic pressure chamber 53 of the master piston 52 is applied to the piston 62 through the communication hole 56 when the brake pedal BP is operated, and the force is applied by the piston biasing spring 65. When the force is greater than the force, the piston 62 moves in the direction of retreating from the communication hole 56. Due to the movement of the piston 62, the head 62h comes into contact with the valve body 67. In this state, the force acting on the valve body 67 via the piston 62 and the valve body 67 from the communication hole 56 through the orifice 66o and the ring-shaped channel 66r. When the resultant force with the force acting on the piston becomes larger than the resultant force of the urging force by the piston urging spring 65 and the urging force by the valve spring 67s, the valve body 67 moves in a direction to open the ring-shaped channel 66r. Thus, the liquid flows from the communication hole 56 into the large-diameter portion 61m of the storage hole 61 through the orifice 66o and the ring-shaped channel 66r.
A communication hole 61r is provided in the peripheral wall of the large-diameter portion 61m, and the front pipe 47 (see FIGS. 5A and 4) is connected to the communication hole 61r.

  Accordingly, the brake pedal BP is operated to generate a hydraulic pressure in the output hydraulic pressure chamber 53 and the communication hole 56 of the master piston 52, whereby the piston 62 is activated and the valve body 67 opens the ring-shaped flow path 66r and communicates. When the liquid flows into the large diameter portion 61m of the storage hole 61 from the hole 56 through the orifice 66o and the ring-shaped flow path 66r, the hydraulic pressure is supplied to the hydraulic cylinder 42 of the front disc brake BF via the communication hole 61r and the front pipe 47. The braking force is applied to the front wheel WF. At this time, the piston 62 in the delay valve 60 is operated by operating the brake pedal BP, and the valve body 67 opens the ring-shaped flow path 66r after the rear wheel brake BR is operated by a predetermined amount. That is, the operation timing of the front wheel brake BF is delayed with respect to the operation timing of the rear wheel brake BR.

The hydraulic pressure suppression valve 70 is for suppressing the hydraulic pressure sent to the slave cylinder 80 when the braking force of the rear brake BR exceeds a predetermined value. The master cylinder 50 and the slave cylinder 80 (see FIG. 4) It is provided between.
The hydraulic pressure suppression valve 70 includes a storage hole 71 provided in the main body U 1 in parallel with the cylinder hole 51, and a valve body 72 slidably stored in the storage hole 71.

  The storage hole 71 has a large-diameter portion 71 m that forms a liquid chamber that communicates with the communication hole 56, and a small-diameter portion 71 s that communicates with the large-diameter portion 71. The end of the large diameter portion 71m is closed with a cylindrical guide member 73, and the outer end thereof is covered with a lid 74.

The valve body 72 has a piston-like valve portion 72v at the tip and a rod portion 72r integral with the valve portion 72v, and the valve portion 72v is slidably fitted to the small diameter portion 71s of the storage hole 71. At the same time, the rod portion 72r is slidably fitted in a guide hole 73g provided at the center of the guide member 73.
The rod portion 72r is integrally provided with a flange 72f. The rod portion 72r1 on the valve portion 72v side is formed with a small diameter, and the rod portion 72r2 on the guide member 73 side is formed with a large diameter. Yes. In other words, the area (pressure receiving area) of the flange 72f viewed from the axial direction of the rod portion 72r is large on the valve portion 72v side and small on the guide member 73 side.

A compression spring (valve spring) 75 is provided between the guide member 73 and the flange 72f, and the valve body 72 is always urged toward the protruding side by the valve spring 75, but the small diameter portion 71s. When the tip of the valve portion 72v comes into contact with the inner end of the valve body 72, the movement of the valve body 72 in the protruding direction is restricted.
On the peripheral wall of the small diameter portion 71s in the storage hole 71, when the valve body 72 is in a protruding state, a flow path 77 is provided at the lower portion of the valve portion 72v (opening is indicated by 77i). The rear pipe 81 is connected to the flow path 77.

  A ring-shaped stepped portion 71d between the small-diameter portion 71s and the large-diameter portion 71m in the storage hole 71 is provided with a ring-shaped valve seat 76 that is concentric with the stepped portion 71d. Protrusions 76p are intermittently provided on the lower surface of the valve seat 76 in the circumferential direction, and a gap C1 is formed between the protrusions 76p. A small diameter portion 72r1 of the rod portion 72r is inserted through the center hole of the valve seat 76, and a gap C2 is formed between the small diameter portion 71r1 and the valve seat 76. These gaps C1 and C2 form a flow path that connects the large diameter portion 71m and the small diameter portion 71s.

When the brake pedal BP is operated, the hydraulic pressure generated in the output hydraulic pressure chamber 53 of the master piston 52 acts on the flange 72f through the communication hole 56, the large diameter portion (liquid chamber) 71m of the storage hole 71, and the gaps C1 and C2. Then, the flange 72f has an area (pressure receiving area) viewed from the axial direction of the rod portion 72r which is large on the valve portion 72v side and small on the guide member 73 side. A force to move toward the 73 side acts.
While this force is smaller than the urging force by the valve spring 75, the valve body 72 is in a protruding state as shown in the figure. In this state, the hydraulic pressure generated in the output hydraulic pressure chamber 53 of the master piston 52 is connected to the slave cylinder through the communication hole 56, the large diameter portion (liquid chamber) 71m, the gaps C1, C2, the flow path 77, and the rear pipe 81. Therefore, the rear drum brake BR is actuated by the action of a slave cylinder 80, which will be described later, and braking force is applied to the rear wheel WR in accordance with the operation of the brake pedal BP.

On the other hand, the braking force of the rear brake BR exceeds a predetermined value, that is, the operating force to the brake pedal BP increases, thereby increasing the hydraulic pressure generated in the output hydraulic pressure chamber 53 of the master piston 52, and the communication hole 56, the fluid pressure acting on the flange 72f through the large-diameter portion (liquid chamber) 71m and the gaps C1 and C2 increases, and the force to move the valve body 72 toward the guide member 73 is If it becomes larger than the urging force by the spring 75, the valve body 72 will move to the guide member 73 side.
As a result, the opening 77i of the flow path 77 is closed by the valve portion 72v, the valve portion 72v contacts the valve seat 76, and the liquid flowing through the gap C2 is blocked or suppressed, and the rear piping 81 from the communication hole 56 is blocked. And the hydraulic pressure to the slave cylinder 80 is suppressed.
That is, when the braking force (hydraulic pressure value) of the rear brake BR exceeds a predetermined value, the hydraulic pressure acting on the slave cylinder 80 is suppressed, and an excessive braking force is prevented from acting on the rear wheel WR by the rear drum brake BR. Will be.

6A and 6B are views showing the slave cylinder 80, where FIG. 6A is a plan view, FIG. 6B is a front sectional view, FIG. 6C is a partial side view, and FIG. 6D is a view taken along line dd in FIG.
The slave cylinder 80 is actuated by receiving hydraulic pressure from the master cylinder 50 interlocked with the operation of the brake pedal BP, and operates the rear drum brake BR via the mechanical transmission member 90 (see FIG. 4). A body 80b, a cylinder hole 82 provided in the cylinder body 80b, and a piston 83 slidably accommodated in the cylinder hole 82 are provided.

The cylinder hole 82 has a large diameter portion 82m and a small diameter portion 82s. The end portion of the large diameter portion 82m is closed by a stopper plate 84 provided with an air hole 84h for releasing the air in the cylinder hole 82 to the air during operation. A circlip 84s fixes the stopper plate 84.
One end of the rear pipe 81 is connected to the cylinder body 80b, and a flow path 85 connected to the hydraulic pressure suppression valve 70 via the rear pipe 81 is provided. The cylinder hole 82 opens to the large diameter portion 82m.

  The piston 83 includes a rod portion 83r, a first slider portion 83s1 provided at one end of the rod portion 83r, a second slider portion 83s2 provided at the other end of the rod portion 83r, and an intermediate portion of the rod portion 83r. The first flange 83f1 and the second flange 83f2 provided are integrally provided.

The first slider portion 83s1 is slidable in close contact with the inner peripheral surface of the large diameter portion 82m in the cylinder hole 82, and the second slider portion 83s2 is in close contact with the inner peripheral surface of the small diameter portion 82s in the cylinder hole 82. It is slidable.
The first flange 83f1 can move in the large diameter portion 82m of the cylinder hole 82, and the second flange 83f2 can move in the small diameter portion 82s of the cylinder hole 82.
A connection rod 86 having a hemispherical head 86h at one end is connected to the second slider portion 83s2 so as to be able to swing, and one end of a mechanical transmission member 90 is connected to the other end of the connection rod 86 ( (See FIG. 2).

  The rod portion 83rm on the first slider portion 83s1 side is formed with a large diameter with the first flange 83f as a boundary, and the rod portion 83rs on the second slider portion 83s2 side is formed with a small diameter. In other words, the area (pressure receiving area) of the first flange 83f1 viewed from the axial direction of the rod portion 83r is large on the second slider portion 83s2 side and small on the first slider portion 83s1 side.

  Accordingly, the hydraulic pressure generated in the output hydraulic pressure chamber 53 of the master piston 52 by the operation of the brake pedal BP described above causes the hydraulic pressure suppression valve 70, the rear pipe 81, the flow path 85, and the large diameter portion 82m of the cylinder hole 82 to be generated. When acting on the first flange 83f1 and the first slider portion 83s1, the force for moving the piston 83 toward the stopper plate 84 is applied to the first flange 83f1 and the first slider portion 83s1. This force acts on the rear drum brake BR via the connecting rod 86 and the mechanical transmission member 90, and the braking force is applied to the rear wheel WR by the operation of the rear drum brake BR.

The cylinder unit CU and the slave cylinder 80 have been mainly described above. As shown in FIGS. 1 to 3, the cylinder unit CU is attached to the inside of the step holder 30, and the slave cylinder 80 is attached to the rear frame portion 15. Yes.
More specifically, the cylinder unit CU has a bifurcated mounting arm CUa, and this arm CUa straddles the spindle 20 of the swing arm 17 in a side view with bolts 57 (see FIG. 3). It is fixed inside the step holder 30.

  The slave cylinder 80 has a bifurcated mounting arm 80a on the cylinder body 80b (see FIG. 6). On the other hand, a mounting plate 15p is integrally fixed to the rear frame portion 15 on the right side in the vehicle body traveling direction along the lower portion thereof by welding or the like. By fixing the mounting arm 80a to the mounting plate 15p with a bolt (not shown), the slave cylinder 80 is mounted from the inside of the rear frame portion 15 in the vehicle width direction as shown in FIG. As a result, the slave cylinder 80 is disposed on the inner side in the vehicle width direction than the outer edge 15o of the rear frame portion 15 in plan view.

  As shown in FIG. 1, the motorcycle includes a vehicle body force bar (under cover 27 or rear side cover 28) that covers the rear frame portion 15 with the lower edge 27e inclined rearwardly upward. In the side view, it is disposed inside the vehicle body force bar and above the lower edge 27e of the vehicle body cover.

As shown in FIGS. 1 to 3, the basic configuration of the rear drum brake BR is well known, and the drum 100 integrated with the wheel hub of the rear wheel WR, the brake shoe 101 built in the drum 100, and the brake A cam 102 for pressing the shoe 101 against the inner peripheral surface of the drum 100, a shaft 103 for rotating the cam 102, and a brake that covers one side of the drum 100 and is supported by the swing arm 17 so as not to rotate. And a panel 104. The shaft 103 is rotatably supported by the brake panel 104. The cam 102 is fixed to the inner end of the shaft 103. A brake arm 105 is fixed to the outer end 103 b of the shaft 103.
Therefore, when the brake arm 105 is rotated, the cam 102 is rotated accordingly, whereby the brake shoe 101 is pressed against the inner peripheral surface of the drum 100 and a braking force is applied to the rear wheel WR.
The base of the brake arm 105 is fixed to the shaft 103, and a mechanical transmission member 90 is connected to the tip.

As shown in FIG. 2, the mechanical transmission member 90 connects the connecting rod 86 of the slave cylinder 80 and the brake arm 105.
The mechanical transmission member 90 can be composed of a known brake cable. The brake cable has a tubular outer cable 91 and a wire 92 inserted through the outer cable 91. That is, the mechanical transmission member 90 is configured by a bendable brake cable.

  In the mechanical transmission member 90, on the slave cylinder 80 side, one end of the outer cable 91 is held by a mounting portion 15b provided by bending the mounting plate 15p of the slave cylinder 80, and one end of the wire 92 is held by the slave cylinder 80. The connecting rod 86 is connected.

On the other hand, in the mechanical transmission member 90, on the rear drum brake BR side, the other end of the outer cable 91 is held by a cable receiving portion 104c provided on the brake panel 104, and the other end of the wire 92 is a rod. 110 is connected to one end of 110.
The rod 110 is inserted into a cylindrical joint piece 111. A male screw 112 is provided at the other end of the rod 110, and a nut 113 is coupled to the male screw portion 112. The nut 113 is integrally provided with a cylindrical portion 114, and the tip of the cylindrical portion 114 is in contact with the joint piece 111. Both ends of the joint piece 111 are held at the tip of the brake arm 105.

As described above, the connecting rod 86 of the slave cylinder 80 is connected to the brake arm 105 of the rear drum brake BR via the mechanical transmission member 90.
Therefore, when the brake pedal BP is operated and the piston 83 and the connecting rod 86 of the slave cylinder 80 pull the wire 92, the rod 110 of the rear drum brake BR is pulled (moves to the right in FIG. 2), and the brake arm 105 is braked. It rotates in the direction (direction in which the brake shoe is pressed against the drum), and a braking force corresponding to the rotation is applied to the rear wheel WR.

In this embodiment, the mechanical transmission member 90 is formed of a brake cable that can be bent as described above, and the slave cylinder 80 is arranged so that the axis of the slave cylinder 80 extends along the rear frame portion 15. The brake cable 90 was arranged along the frame portion 15 and connected to the tip end portion of the brake arm 105 by being bent forward and extending rearward in a side view (FIG. 2).
Further, the brake arm 105 extends downward from the rotating shaft 103, and the brake cable 90 is connected to the tip of the brake arm 105 on the lower side of the swing arm 17 in a side view (FIG. 2).
In this embodiment, the wire 92 is connected to the brake arm 105 via the rod 110 and the joint piece 111. However, the wire 92 can be directly connected to the brake arm 105.

As shown in FIGS. 2 and 7, a holding member 120 of a mechanical transmission member 90 is provided inside the swing arm 17, and the mechanical transmission member 90 can be held with a clearance by this holding member 120. . The holding member 120 includes a substantially semi-cylindrical holding body 121 into which the mechanical transmission member 90 is inserted, an attachment body 122 attached so as to press the holding body 121 against the inner surface of the swing arm 17, and the attachment And a bolt 124 that fastens and fixes the body 122 to the swing arm 17 via a spacer 123.
2, the brake arm 105 extends upward from the rotating shaft 103, and the brake cable 90 can be connected to the tip of the brake arm 105 on the upper side of the swing arm 17. FIG. 1 shows the state in that case. In this case, the holding member 120 is provided so as to guide the mechanical transmission member 90 rearward to the upper side of the swing arm 17 as indicated by a virtual line.

According to the motorcycle interlocking braking device as described above, the following operational effects can be obtained.
(A) In this embodiment, a main frame portion 13 that extends downward and rearward from a head pipe 12 that supports the steering wheel 16 in a steerable manner, and a rear frame portion 15 that extends upward and rearward from the rear end portion of the main frame portion 13. , A vehicle body frame F including a pivot frame portion 14 extending downward from the rear end portion of the main frame portion 13, a rear drum brake BR for braking the rear wheel WR rotatably supported by the vehicle body frame F, and the vehicle body frame F A front disc brake BF that brakes the front wheel WF that is rotatably supported, a brake pedal BP that is rotatably supported by the vehicle body frame F, and a rear drum brake BR and a front disc brake in conjunction with the operation of the brake pedal BP. An interlocking brake device CB that generates a braking force applied to the BF, and the interlocking brake device CB is a motorcycle interlocking braking device including a master cylinder that operates in conjunction with the operation of the brake pedal BP. A front pipe 47 that transmits the hydraulic pressure generated by the operation of the master cylinder 50 to the front disc brake BF, A slave cylinder 80 that operates when the hydraulic pressure generated by the operation of the cylinder 50 is transmitted via the rear pipe 81, and a mechanical transmission member 90 that transmits the output of the slave cylinder 80 to the rear drum brake BR. In addition, since the slave cylinder 80 is supported by the rear frame portion 15 separated from the brake pedal BP, the following effects can be obtained according to the motorcycle interlocking braking device.
Since the rear wheel brake BR remains a drum brake, the cost can be reduced and the slave cylinder 80 is supported by the rear frame portion 15 that is separated from the brake pedal BP supported by the vehicle body frame F. The area around the BP can be simplified. That is, by supporting the slave cylinder 80 on the rear frame portion 15, it is possible to simplify the area around the brake pedal BP, and the degree of freedom of layout around the brake pedal BP is improved.

(B) The mechanical transmission member 90 is formed of a bendable brake cable, and the slave cylinder 80 is placed along the rear frame portion 15 so that the axis of the slave cylinder 80 is along the rear frame portion 15. Since it is arranged, the slave cylinder 80 can be easily supported and the arrangement space can be made compact. In addition, since the mechanical transmission member 90 is a bendable brake cable, the connection work between the slave cylinder 80 and the rear drum brake BR is facilitated.

(C) One end is pivotally supported by the pivot frame 14 and the other end is provided with a swing arm 17 that pivotally supports the rear transfer WR. The rear drum brake BR has one end pivoted. The brake cable 105 includes a brake arm 105 that can be supported, and in a side view, the brake cable 90 is disposed to extend rearward after being bent forward and is connected to the other end of the brake arm 105. The cable 90 can be disposed with a sufficient bending radius. For this reason, even when the swing arm 17 swings, the load applied to the brake cable 90 can be reduced.

(D) The brake arm 105 extends downward from the pivot shaft 103 that is rotatably supported, and the brake cable 90 is connected to the other end of the brake arm 105 below the swing arm 105 in a side view. Therefore, the burden on the brake cable 90 can be further reduced by increasing the radius of curvature.

(E) The lower edge 27e is provided with a vehicle body force bar (27, 28) that slopes rearward and covers the rear frame part 15, and the slave cylinder 80 is more vehicle-mounted than the outer edge 15o of the rear frame part 15 in plan view. In addition to being arranged on the inner side in the width direction and in the side view, on the inner side of the vehicle body force bar (27, 28) and above the lower edge 27e of the vehicle body cover, the slave cylinder is arranged on the inner side of the rear frame portion 15. In addition, since the sides are covered with the covers (27, 28), the slave cylinder 80 can be protected from external force. Further, since the slave cylinder 80 is hidden by the cover, it is possible to improve the design.

(F) The interlocking brake device CB includes a delay valve 60 that delays the timing of transmission to the CFC disc brake BF, and a hydraulic pressure that is sent to the slave cylinder 80 when the braking force of the rear brake BR exceeds a predetermined value. Since the hydraulic pressure suppression valve 70 is integrally provided to suppress the braking force, the braking force can be appropriately controlled by each valve, and the integration around the brake pedal BP is suppressed by the integration. be able to.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the gist of the present invention.
For example, in the present application, the pedal shaft 31 is supported on the back side of the pillion step holder 30. However, the present invention is not limited to this, and the pedal shaft 31 may be attached to the pivot frame 14 or a part of the crankcase in the engine. Good. Further, the cylinder unit CU can be attached not to the step holder 30 but to the pivot frame portion 14.

F Body frame RB Rear drum brake WR Rear wheel EF Front wheel BF Front disc brake BP Brake pedal CB Interlocking brake device 12 Head pipe 13 Main frame 14 Pivot frame part 15 Rear frame part 16 Handle 17 Swing arm 27, 28 Body force bar 47 Front piping 50 Master cylinder 60 Delay valve 70 Fluid pressure suppression valve 81 Rear piping 80 Slave cylinder 90 Mechanical transmission member (brake cable)
103 Rotating shaft 105 Brake arm

Claims (6)

A main frame portion that extends downward and rearward from a head pipe that supports the steering wheel, a rear frame portion that extends upward and rearward from the rear end portion of the main frame portion, and a pivot that extends downward from the rear end portion of the main frame portion A vehicle body frame including a frame portion;
A rear drum brake that brakes the rear wheels;
A front disc brake that brakes the front wheels;
A brake pedal rotatably supported on the vehicle body frame;
An interlocking brake device that generates a braking force applied to the rear drum brake and the front disc brake in conjunction with an operation of the brake pedal;
The interlocking brake device is a motorcycle interlocking braking device including a master cylinder that operates in conjunction with the operation of the brake pedal.
Front piping for transmitting the hydraulic pressure generated by the operation of the master cylinder to the front disc brake;
A slave cylinder that operates when the hydraulic pressure generated by the operation of the master cylinder is transmitted through a rear pipe;
A mechanical transmission member for transmitting the output of the slave cylinder to the rear drum brake;
The interlock braking device for a motorcycle, wherein the slave cylinder is supported by the rear frame portion separated from the brake pedal.   The mechanical transmission member is constituted by a bendable brake cable, and the slave cylinder is arranged along the rear frame portion so that the axis of the slave cylinder is along the rear frame portion. The motorcycle interlocking braking device according to claim 1. The pivot frame portion includes a swing arm that is supported at one end so as to be swingable and the other end rotatably supports the rear transportation.
The rear drum brake includes a brake arm whose one end is rotatably supported,
3. The motorcycle interlocking according to claim 2, wherein, in a side view, the brake cable is arranged to extend rearward after being bent forward and connected to the other end of the brake arm. Braking device.   The brake arm extends downward from a pivot shaft that is rotatably supported, and the brake cable is connected to the other end of the brake arm at a lower side of the swing arm in a side view. The interlock braking device for a motorcycle according to claim 3. A vehicle body force bar that covers the rear frame part with the lower edge inclined rearwardly upward,
The slave cylinder is disposed on the inner side in the vehicle width direction with respect to the outer edge of the rear frame portion in plan view, and is disposed on the inner side of the vehicle body force bar and above the lower edge of the vehicle body cover in side view. The interlock braking device for a motorcycle according to any one of claims 2 to 4, wherein   The interlock brake device includes a delay valve that delays the timing of transmission to the CFC disc brake, and a fluid that suppresses fluid pressure sent to the slave cylinder when the braking force of the rear brake exceeds a predetermined value. The interlock braking device for a motorcycle according to any one of claims 1 to 5, wherein a pressure suppression valve is integrally provided.

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