JPH09263285A - Brake operation device for motorcycles - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent a foot of a rider and other components from interfering with a brake pedal, to simplify the arrangement of components and to improve operability. According to the present invention, an operation portion 16b of a brake pedal 16 is moved downward to move a piston rod 10b of a master cylinder 10 to increase a braking force by a brake mechanism 12. In the brake pedal device configured to reduce braking by the brake mechanism 12 by returning the operating portion 16b to the upper side, the brake pedal 16 has the operating portion 16b located at the rearmost end in the initial position, The master cylinder 10 is pivotally attached to the front, the master cylinder 10 is swingably held by the frame 1, and the piston rod 10b is attached to the brake pedal 16.
This is connected within the range from the shaft attachment portion 16a to the operation portion 16b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake pedal device for operating a rear brake in a motorcycle,
In particular, the present invention relates to a brake pedal device suitable for road sports vehicles and the like.

[0002]

2. Description of the Related Art Conventionally, as a brake pedal device for performing a braking operation on a rear wheel, there is, for example, one shown in FIG. In the figure, a brake pedal B is rotatably supported on a lower portion of a main frame A by a rotation fulcrum shaft C, and the rotation fulcrum shaft C of the brake pedal B supports one end of a swing arm. It is located below the pivot axis E and is located behind the footrest G projecting from the undertube F connected to the main frame A. The operating portion B1 formed at the tip of the brake pedal B is located in front of the footrest G, and the protruding portion B2 formed at the rear portion protrudes rearward of the rotating shaft C, The piston rod Ha of the master cylinder H is pivotally mounted here. The brake pedal is held by the return spring I so that it is always horizontal.

In the conventional brake operating device thus constructed, when the rider depresses the front end portion B1 of the brake pedal B downward with the tip of the foot placed on the footrest G, the arm portion B2 of the brake pedal B causes the piston to move. The rod Ha is pushed up, the piston of the master cylinder H presses the oil in the master cylinder H into the rear rear brake mechanism via the brake hose, and the hydraulic pressure actuates the brake mechanism held by the swing arm to rear wheel. It is designed to brake. Further, if the pressing force applied to the front end of the brake pedal B is released, the return spring I returns to a substantially horizontal initial position by the urging force of the return spring I, and the piston rod Ha and the piston rod Ha return downward, so that the brake is applied. Braking of the rear wheel by the mechanism is released.

By the way, in the conventional brake pedal device as described above, since the rotation axis C of the brake pedal B is set at the rear position of the footrest G, in addition to the arrangement of the master cylinder H, the brake pedal B and the brake pedal B are arranged. There is a problem in that the shape and arrangement of the exhaust pipe located below is accompanied by many difficulties. That is, since the rider's foot exists outside the master cylinder H, the swing arm exists inside, and the rear rail D exists near the upper part,
It was quite difficult to arrange the master cylinder H so as to avoid interference with these. Further, when the exhaust pipe is arranged below the brake pedal B, the brake pedal B and the muffler are curved or a recess is formed in order to avoid interference with the exhaust pipe when the brake pedal B is depressed. However, there is also a problem that this deteriorates the operability of the brake pedal B and the performance of the exhaust pipe.

The above-mentioned problems are particularly noticeable in road sports vehicles and the like. That is, in a road sports vehicle, as shown in FIG. 5, there is a so-called back step in which a main frame J is provided with a footrest bracket K facing rearward and a footrest L is attached thereto, but in this case, Since the brake pedal M and the master cylinder N are also attached to the footrest bracket K, the peripheral portion of the footrest L is further complicated, and the master cylinder N is attached to the rider's foot.
There is a higher risk of contact between components, including, and the placement of components becomes more complex.

The present invention has been made to solve the above-mentioned problems of the prior art.
An object of the present invention is to provide a brake operating device capable of preventing the rider's foot and other components from interfering with each other, simplifying the arrangement of the components, and improving the operability.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a footrest supported by a frame of a motorcycle and a front portion of the footrest are axially mounted, and an operating portion formed at one end is always forward of the footrest. Brake pedal elastically held in the initial position, a master cylinder supported by the frame and a piston rod for moving a piston connected to the brake pedal, and a master cylinder connected via a pipe body The brake pedal is moved forward and the piston rod of the master cylinder is moved to pump the brake oil from the master cylinder to the brake mechanism to reduce the braking force by the brake mechanism. While increasing the brake pedal, the brake pedal operation part is returned upward. In the brake pedal device configured to reduce the braking by the brake mechanism, the brake pedal is axially mounted so that the operating portion is located at the rearmost end and is located forward of the footrest in the initial position, and the master cylinder is The piston rod is swingably held by the frame and is connected within a range from the shaft attachment portion of the brake pedal to the operation portion.

Therefore, in the present invention, the portion where the rider's foot and the brake pedal come into contact with each other when traveling is only the front end portion of the brake pedal, and the other portions are located in front of the operating portion, which is No more contact with the rider's feet. Also, since the piston rod of the master cylinder is connected within the range from the shaft attachment position of the brake pedal to the operation part, it is possible to push down the piston rod in the forward direction by the brake pedal to project it outward. , Brake oil is pumped to the brake mechanism to activate and brake the brake mechanism to brake the rear wheel. By this pedal operation, the piston rod swings in the left-right direction, but if the master cylinder and the oil reservoir are connected by a flexible pipe body, even if the swing is large, There is no risk of damage to the master cylinder, oil reservoir, pipe, etc.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory side view showing a motorcycle to which an embodiment of the present invention is applied, and FIG.
3 is an explanatory enlarged side view showing the main part of the embodiment of the present invention. The motorcycle shown here is a road sports vehicle, and a frame 1 forming the skeleton of the vehicle body includes a head pipe 2 that holds a steering shaft rotatably, and two pipes extending obliquely rearward from the head pipe 2. It is configured by a twin tube frame provided with the main tube 3 and the like, and a swing arm 5 is provided at a rear portion 3a of the main tube 3 so as to be swingable in a vertical direction about a pivot 4, and the swing arm 5 includes A rear wheel 6 is rotatably supported.

The rear portion 3 of the main tube 3
A footrest bracket 7 is fixed to a by screws 8 so as to project further rearward.
At the rear end portion of the foot bracket 7, footrests 9 for the rider to put his / her feet on while traveling are provided so as to project outward from the left and right sides of the frame 1, which is a so-called back step.

The rear portion 3a of the main tube 3
The upper end portion 10a of the master cylinder 10 is pivotally mounted on the shaft by a shaft 11 located near the pivot 4. This master linda 10 is connected via a brake hose 11 to a brake caliper 12a of a rear brake mechanism 12 provided on a rear wheel 6, and is also connected to an oil reservoir 13 fixed to an upper rear part 3b of the main tube 3. They are connected via a flexible connecting hose 14, and are kept in a substantially vertical state as a whole. Also,
The master cylinder 10 allows oil to be transferred to the caliper 12 by causing the piston rod 10b to project downward.
It is designed to be pumped to a. The change in the amount of oil in the master cylinder 10 is absorbed by the oil reservoir 13.

On the other hand, a brake pedal 16 is pivotally attached to the lower end of the rear portion of the main tube 3 by a fulcrum shaft 15. As shown in FIG. 2, the brake pedal 16 is slanted outward in a plan view from an end portion (the other end portion) 16a pivotally attached to the fulcrum shaft 15 to an operation portion 16b protruding from the one end portion. It projects and is located outside the exhaust pipe 17 located below it. A piston rod 10b of the master cylinder 10 is connected within a range from the operation portion 16b to the fulcrum shaft 15.

As a result, the brake pedal 16 is
The fulcrum shaft 15 is held so as to extend rearward from the front end of the shaft-attached portion (the other end) 16a, and the operating portion 16
b is located at the rear end. In the initial state, the biasing force of the return spring causes the shaft portion 16a to be tilted slightly obliquely upward from the rear portion to the operation portion 16b, as shown by the solid line in FIG. Further, in this initial state, the operation portion 16b of the brake pedal is located within a distance range in which the rider can easily operate the pedal with his / her foot on the footrest. The brake pedal 16 and the piston rod 1 of the master cylinder 10
In order to reduce the pressing force of pedal operation, the connecting position with
It is set near the fulcrum shaft 15.

In the brake operating device constructed as described above, when the operating portion of the brake pedal is depressed by the tip of the foot placed on the footrest 9 during traveling, the brake pedal 16 resists the biasing force of the return spring. As shown by the alternate long and short dash line 3 in FIG. 3, the fulcrum shaft 15 is rotated downward, and the piston rod 10a of the master cylinder 10 is projected downward. As a result, the brake oil in the master cylinder 10 is pressure-fed to the brake mechanism 12 via the brake hose 11, the brake mechanism 12 is operated by the hydraulic pressure, and the braking force is applied to the rear wheel 6. At this time, due to the rotation of the brake pedal 16, the piston rod 10a of the master cylinder 10 moves the brake pedal 16 slightly forward, but the movement in the front-back direction is that the master cylinder 10 moves in the front-back direction about the fulcrum shaft 15. The piston rod 10b is smoothly retracted and retracted by being absorbed.

Further, since the brake hose 11 that connects the master cylinder 10 and the brake caliper 12a of the rear brake mechanism 12 is arranged along the swing arm 5, the swing of the swing arm 5 also rocks the brake hose 11. However, since the upper end 10a of the master cylinder 10 is connected near the pivot 4 which is the swing fulcrum of the swing arm 5, the relative position between the swing arm 5 and the master cylinder 10 does not change much. Therefore, no excessive force is applied to the connecting portion between the brake hose 11 and the master cylinder 10, and this portion is not adversely affected such as deterioration or damage. Therefore, the piping of the brake hose 11 can be performed very easily.

Further, the footrest bracket 6 includes
Since only the footrest 9 serving as a back step is provided and the brake pedal 16 and the master cylinder 10 are fixed to the rear portion 3a of the main tube 3,
The foot placed on the footrest 9 does not come into contact with the master cylinder 10 or the like, and the pedal operation can be performed smoothly and easily, and a slim riding position can be obtained. Therefore, in addition to the operability of the brake pedal 16, the steerability of the motorcycle is improved. Further, since it is not necessary to attach the brake pedal 16 or the master cylinder 10 to the footrest bracket 6, the shape of the footrest bracket 6 can be simplified, and the left and right can be shared and the weight can be reduced.

Further, since the brake pedal 16 as a whole is located in front of the footrest 9, there is no fear that the brake pedal 16 will come into contact with the exhaust pipe 17 which is often arranged under the footrest 9 in a close state. Disappear. Therefore, as in the conventional case, the brake pedal 16 and the exhaust pipe 17 are
It is not necessary to bend each of them to avoid contact with each other or to form a recess, and it is possible to set each of them in an optimum shape from the viewpoint of performance and cost. That is, as the exhaust pipe, a shape suitable for the engine can be set, and improvement in engine performance can be expected. Further, the brake pedal 16 can be easily operated and can be set to a low-priced shape.

Further, since the master cylinder 10 may be directly attached to the main tube 3 or the like, it is possible to obtain a certain degree of freedom in its attaching position, and moreover,
Since the master cylinder 10 is attached at an angle close to vertical, the master cylinder 10 can be easily connected to the brake pedal 16. Furthermore, when integrally molding the frame 1,
The master cylinder 10 and the boss formed on the shaft mounting portion of the brake pedal 16 can also be molded at the same time. Moreover, since the master cylinder 10 is attached only by the upper end portion 10a, it is firmly fixed to the frame at two or more places. In comparison with the conventional case, the number of mounting points can be reduced, and the cost can be reduced accordingly. Further, in order to pivotally mount the piston rod 10b within the range from the front end portion to the rear end portion of the brake pedal 16, the piston rod Ha of the master cylinder H is attached to the protruding portion B2 protruding outward of the fulcrum shaft as in the conventional case. The brake pedal can be made compact and inexpensive as compared with the case where the brake pedal is connected.

In the above embodiment, the case where the footrest 9 is provided on the footrest bracket 6 has been described as an example, but the present invention is also applicable to a case where the footrest bracket is not used, and the present invention is particularly applicable to the above embodiment. It is not limited to this form.

[0020]

As described above, according to the brake operating device of the present invention, it is possible to prevent the rider's foot and other components from interfering with the brake pedal. It is possible to improve the character and to optimize the riding posture of the rider, and it is possible to realize mass concentration. Further, since it is possible to avoid the interference between both parts without constructing the brake pedal and the exhaust pipe into a special shape, both members can be constructed at low cost and with high performance, and the performance and cost of the motorcycle can be improved. It can be reduced. Further, since the master cylinder pumps the brake oil by moving the piston rod forward in the projecting direction, it is possible to reduce the number of parts, cost and weight.

[Brief description of drawings]

FIG. 1 is an explanatory side view showing a motorcycle to which an embodiment of a brake operating device according to the present invention is applied.

FIG. 2 is an explanatory plan view of what is shown in FIG.

FIG. 3 is an explanatory enlarged side view showing a main part of the embodiment of the brake operating device according to the present invention.

FIG. 4 is an explanatory enlarged side view showing a main part of a conventional brake operating device.

FIG. 5 is an explanatory enlarged side view showing a main part of a conventional brake operating device.

[Explanation of symbols]

 1 Frame 9 Footrest 10 Master Cylinder 10b Piston Rod 13 Oil Reservoir 14 Connection Hose (Tube) 16 Brake Pedal 16a The Other End of the Brake Pedal (Shaft Attachment) 16b One End of the Brake Pedal (Operating Section)

Claims (2)

[Claims] 1. A footrest supported by a frame of a motorcycle, and an operation portion axially attached to a front portion of the footrest and formed at one end thereof is always elastically held at an initial position in front of the footrest. A brake pedal, a master cylinder supported by the frame and connected to the brake pedal with a piston rod for moving a piston, and an oil reservoir connected to the master cylinder via a pipe body. By moving the operation portion of the brake pedal downward, the piston rod of the master cylinder is moved to pump the brake oil from the master cylinder to the brake mechanism to increase the braking force by the brake mechanism. By moving the operation part of the brake pedal upward, In the brake pedal device configured to reduce the braking by the brake pedal, the brake pedal is axially mounted so that the operating portion is located at the rear end and is located forward of the footrest in the initial position, and the master cylinder swings on the frame. A brake pedal device for a motorcycle, wherein the brake pedal device is movably held and is connected to a piston rod within a range from a shaft attachment portion to an operation portion of the brake pedal. 2. The brake pedal device according to claim 1, wherein the oil reservoir is connected to the master cylinder by a flexible pipe body.