JPH0237674Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a brake lever device for a two-wheeled vehicle, which is suitably used, for example, to operate the brakes of a two-wheeled motor vehicle.

[Conventional technology]

In general, a brake device for applying braking to a motorcycle includes a hydraulic brake such as a drum brake or a disc brake, a master cylinder attached to the handlebar for supplying and discharging oil to the hydraulic brake, and a master cylinder attached to the handlebar for supplying and discharging oil to the hydraulic brake. It consists of a pivotally supported brake lever for generating hydraulic pressure, and the driver can operate the master cylinder by grasping and rotating the lever.

By the way, in the case of a brake device for a two-wheeled vehicle, in order to improve the operation feeling of the brake lever, it is desirable that the distance between the brake lever and the handle can be adjusted according to the size of the driver's hand.

For this reason, as a conventional technology, for example,
A brake lever device shown in Japanese Patent No. 25409 has been proposed. In this conventional technology, the piston pressing screw of the master cylinder for hydraulic pressure generation is attached to the handbrake lever so that the protrusion amount can be adjusted freely, and the lever rotation fulcrum is placed on the opposite side of the piston pressing screw. The brake lever is characterized by a lever return position adjustment screw, and by screwing these pressure screws together with the adjustment screw, the distance between the brake lever and the handlebar is adjusted. .

[The problem that the idea attempts to solve]

However, the conventional technology described above has the disadvantage that the distance between the brake lever and the handle must be adjusted while taking into consideration the balance between the pressing screw and the adjusting screw, and the adjustment is troublesome. . On the other hand, if the mutual adjustment between these screws is incorrect,
The problem was that the piston remained pushed into the master cylinder from the beginning, causing brake drag.

The present invention was developed in view of the above-mentioned circumstances, and the brake lever is divided into a grip member operated by the driver and a piston pushing member that acts as a stopper for the grip member and pushes the brake piston. By appropriately setting the separation angle of the grip member with respect to the piston pushing member, the separation distance between the handle and the grip member can be easily adjusted, and erroneous adjustment can be eliminated. The object of the present invention is to provide a brake lever device for a two-wheeled vehicle.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a two-wheeled vehicle in which hydraulic pressure is generated by pushing a piston in a master cylinder to be attached to a handlebar by a brake lever provided on the master cylinder. In a brake lever device for a master cylinder, the brake lever includes a rod-shaped grip member whose one end is rotatably attached to the master cylinder and whose other end is gripped by a driver, and the grip member and the master cylinder. and a piston pushing member that is rotatably provided coaxially and rotatably with the grip member, and the pushing member has a pushing part that pushes an end of the piston. At the same time, it extends from the rotation center to the master cylinder side,
A stopper part is formed that limits the distance between the grip member and the handle by coming into contact with the master cylinder, and a stopper part is provided between the grip member and the piston pushing member to control the grip position of the grip member with respect to the handle. The piston is characterized by being provided with an adjusting screw that adjusts the piston and transmits the operating force of the grip member to the piston pushing member.

[Effect]

With this configuration, the grip member and the piston pushing member are rotatably provided coaxially,
Moreover, since the piston pushing member contacts the master cylinder via the stopper part, it can be made independent of the piston pushing member by appropriately setting the separation angle of the grip member with respect to the piston pushing member using an adjustment screw. Only the grip member can be adjusted in distance from or near the handle, and therefore, the operation feeling can be suitably adjusted according to the size of the hand. When the driver grasps the grip member and pulls it toward the handle, the operating force is transmitted to the piston pushing member via the adjustment screw, and the pushing part of the piston pushing member pushes the end of the piston. .

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 is a master cylinder, and the master cylinder 1 is provided with a bottomed cylinder 2, a hydraulic pipe (not shown) on the side near the bottom of the cylinder 2, and a hydraulic pipe (not shown).
Oil fluid supply/discharge port 3 connected to the hydraulic brake via
and a flat stopper groove bottom 4 provided on the opening side of the cylinder 2 and extending along the axial direction of the cylinder 2.
A pair of brackets 4, 4 (one not shown in the drawings) face each other so as to form a brake lever insertion groove having a shape A, and have a pin hole, and a pair of brackets 4, 4 (one not shown in the drawing) are provided on the opening side of the cylinder 2, and are provided on the opening side of the cylinder 2 for insertion of the handle. hole 5
A master cylinder mounting portion 5 is provided.

Reference numeral 6 denotes a piston that is fitted into the cylinder 2 in a fluid-tight and reciprocating manner, and whose tip protrudes from the cylinder 2 to form a protruding end 6A.
A liquid chamber A having an oil supply/discharge port 3 is formed between the piston 6 and the cylinder 2, and a spring 7 is disposed within the liquid chamber A between the piston 6 and the bottom surface of the cylinder 2. is always urged toward the opening side of the cylinder 2 by the spring 7. A dust seal 8 is stretched between the piston 6 and the open end of the cylinder 2, and the dust seal 8 prevents dust from entering the cylinder 2.

9 indicates a brake lever, and the brake lever 9 includes a grip member 10 and a piston pushing member 1.
It is composed of 1.

Here, the gripping member 10 is made of a rod-shaped body that is gripped by the driver, and a slit groove 10A into which the piston pushing member 11 is rotatably fitted is formed at one end of the gripping member 10. A pin hole is drilled in the brackets 4, which communicate with the pin holes drilled in the brackets 4, 4, and the rear of the slit groove 10A becomes a grip portion 10B, and a portion near the boundary between the grip portion 10B and the slit groove 10A is formed. A screw hole 12 is bored in the direction perpendicular to the axis of the grip portion 10B.

Further, the piston pushing member 11 is made of a plate-shaped body that is fitted into the slit groove 10A of the gripping member 10. Then, the piston pushing member 11
A pin hole 11A communicating with a pin hole drilled in each bracket 4, a pushing part 11B protrudingly provided to push the protruding end 6A of the piston 6, and a pushing part 11B extending from one end side of the grip member 10. It is protruded from the pin hole 11A, which is the center of rotation, at a position forming an acute angle with the pushing part 11B so as to extend in the axial direction, and is positioned by coming into contact with the stopper groove bottom 4A of the brackets 4, 4. It is composed of a stopper part 11C, and a connecting part 11D protruding at a position substantially opposite to the stopper part 11C with the pin hole 11A in between. An elongated hole 13 is bored approximately coaxially with the screw hole 12 of the grip member 10, and the peripheral edge of the elongated hole 13 on the side facing the grip member 10 forms a concave spherical receiving surface 14.

In order to assemble the grip member 10 and the piston pushing member 11 formed in this way to the master cylinder 1, the piston pushing member 11 is inserted into the slit groove 10A of the grip member 10, and then the piston is pushed in this state. Insert the moving member 11 and the grip member 10 between the pair of brackets 4, 4 of the master cylinder 1, and then insert the pin 15 from the pin hole of each bracket 4 to the pin hole of the slit groove 10A and the pin hole of the piston pushing member 11. 11A sequentially. With this, the grip member 10 and the piston pushing member 11 are connected to the bracket 4,
It is coaxially and rotatably supported with respect to the master cylinder 1 by a pin 15 so as to be sandwiched between the cylinders 1 and 4.

Furthermore, reference numeral 16 denotes an adjustment screw that connects the grip member 10 to the piston pushing member 11 and transmits the operating force of the grip member 10. A large diameter portion 16A with a thread carved therein, and a small diameter portion 16B formed at the tip of the large diameter portion 16A so as to be inserted into the elongated hole 13.
and a convex spherical shoulder 16C that is formed at a step between the large diameter portion 16A and the small diameter portion 16B and abuts the concave spherical receiving surface 14. To connect the grip member 10 and the piston pushing member 11, the large diameter portion 16A of the adjusting screw 16 is screwed into the screw hole 12, the small diameter portion 16B is inserted into the elongated hole 13, and A retaining ring 18 is attached to the tip of the small diameter portion 16B via a wave washer 17, and the adjusting screw 16 is fixed by the retaining ring 18 to prevent it from coming out of the elongated hole 13. In the figure, 19 is a lock nut for locking the adjustment screw 16;
0 indicates a steering wheel, and 21 indicates a brake fluid reservoir.

Next, the operation of the brake lever device configured as described above will be explained.

First, to attach the master cylinder 1 to the handle 20, insert the handle insertion hole 5A of the master cylinder attachment part 5 into the handle 20, and fix it with a fixing screw (not shown). Thereby, the master cylinder 1 and the brake lever 9 are attached to the handle 20.

Here, in order to apply braking to the wheels, the grip member 10
, and rotate it toward the handle 20. As a result, the piston pushing member 11
The operating force is transmitted to the piston pushing member 11, which rotates integrally with the piston pushing member 11, and the pushing part 11B pushes the piston 6 against the spring force of the spring 7, thereby draining the brake fluid in the fluid chamber A. The oil is supplied to the hydraulic brake from the oil supply/discharge port 3, and the hydraulic brake is operated. On the other hand, when the grip member 10 is released, the piston 6 returns to its original position due to the spring force of the spring 7, and the piston pushing member 1
1 also rotates counterclockwise together with the grip member 10,
The stopper portion 11C of the piston pushing member 11 abuts against the stopper groove bottom 4A of the bracket 4, and stops in that state.

However, in order to adjust the grip member 10 relative to the steering wheel 20 in accordance with the size of the driver's hands, the lock nut 19 is first loosened and the adjusting screw 16 is turned by screwing.

At this time, the adjusting screw 16 is attached to the wave washer 17.
The convex spherical shoulder 16C of the adjusting screw 16 is brought into contact with the concave spherical receiving surface 14, so that by screwing the adjusting screw 16, the grip can be adjusted. The member 10 is rotated around the pin 15. As a result, the separation angle (expansion angle) of the grip member 10 with respect to the piston pushing member 11 about the pin 15 changes, so that the distance between the grip member 10 and the handle 20 can be adjusted by the driver. It can be adjusted appropriately according to the size of your hands. After the adjustment is completed, the lock nut 19 is tightened again to determine its position.

Here, when adjusting the distance of the grip member 10 relative to the handle 20, even if the adjustment screw 16 is turned, the grip member 10 only rotates, and the piston pushing member 11 is rotated by its stopper portion 11C. is regulated, the piston pushing member 11
is not displaced at all. Therefore, as in the prior art, during such adjustment, the piston pushing member 11 rotates and inadvertently pushes the piston 6 into the cylinder 2.
Accidents that cause a dragging phenomenon can be reliably prevented. Further, the small diameter portion 16 of the adjustment screw 16
Since B is inserted through the elongated hole 13, the grip member 1
0 to adjust distance relative to the handle 20, the small diameter portion 16B can escape in the longitudinal direction of the elongated hole 12, and the small diameter portion 16B can escape from the elongated hole 13.
It will not hit the inner peripheral surface. Therefore, the adjustment of the grip member 10 is not disturbed. Moreover, the convex spherical shoulder portion 16C of the adjustment screw 16 has a spherical shape,
Since the shoulder portion 16C is in contact with the concave spherical receiving surface 14, the adjusting screw 16 is turned with the convex spherical shoulder portion 16C being received on the concave spherical receiving surface 14, and the adjustment is performed. The screw 16 can be adjusted smoothly.

[Effect of idea]

The brake lever device for a two-wheeled vehicle according to the present invention is as described in detail above, and includes a grip member operated by the driver for controlling the brake lever, and a brake lever device located between the grip member and the master cylinder. It is divided into a piston pushing member that rotates coaxially and integrally with the member, and the piston pushing member has a pushing part that pushes the piston, and a stopper that regulates the distance between the grip member and the handle. An adjustment screw is provided between the grip member and the piston pushing member to adjust the gripping position of the grip member with respect to the handle and to transmit the operating force of the grip member to the piston pushing member. Therefore, the separation angle of the grip member relative to the piston pushing member can be appropriately set by simply moving the adjustment screw forward and backward.
It is possible to adjust the distance between the grip member and the handle independently of the piston pushing member by adjusting only with the adjustment screw, and the distance between the grip member and the handle can be easily adjusted to suit the size of the hand. can. In addition, even if the adjusting screw is erroneously adjusted, no unexpected external force will be applied to the piston, so it is possible to reliably prevent the brake from dragging due to the piston being pushed in too much as in the prior art.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a state in which a brake lever device for a two-wheeled vehicle according to the present invention is assembled to a master cylinder, and FIG. 2 is a cross-sectional view in the direction indicated by the - arrow in FIG. 1...Master cylinder, 2...Cylinder, 6...
...Piston, 9...Brake lever, 10...Gripping member, 11...Piston pushing member, 11B...
Pushing part, 11C...Stopper part, 16...Adjustment screw, 20...Handle.

Claims (1)

[Scope of utility model registration request] In a brake lever device for a master cylinder for a two-wheeled vehicle, the brake lever device generates hydraulic pressure by pushing a piston in a master cylinder to be attached to a handlebar with a brake lever provided on the master cylinder. a rod-shaped grip member whose one end is rotatably provided on the master cylinder and whose other end is gripped by the driver; and a rod-shaped grip member located between the grip member and the master cylinder and coaxial with the grip member. and a piston pushing member that is rotatably provided, and the pushing member has a pushing part that pushes the end of the piston, and a piston pushing member that is rotatably provided. A stopper portion is formed that extends and abuts against the master cylinder to regulate the distance between the grip member and the handle, and furthermore, a stop portion is provided between the grip member and the piston pushing member, and a stop portion is provided between the grip member and the piston pushing member. A brake lever device for a two-wheeled vehicle, comprising an adjustment screw that adjusts the position and transmits the operating force of the grip member to the piston pushing member.