JPH0657548B2 - Vehicle braking lever position adjusting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is capable of adjusting an initial position of a braking lever (a return position, that is, a position of the braking lever with respect to a handle grip or the like when the braking lever is lightly gripped). A device for adjusting the position of a braking lever of a vehicle capable of:
According to the size and preference of the driver's hand, the distance between the handle grip and the lever part of the braking lever can be adjusted easily, easily and finely without affecting the return position of the master cylinder piston. Is.

[Problems of Prior Art and Present Invention]

In vehicles such as motorcycles and motorcycles, a brake lever is provided on a brake or a brake pedal on a fixed body such as a handlebar or body frame, and a piston fitted to a brake master cylinder is pushed by rotating the brake lever. In this case, the initial position of the brake lever (the position of the brake lever with respect to the handle grip when the brake lever is lightly gripped during traveling) is set according to the driver's hand size and preference. There is one that can adjust the distance to the lever. However, since the conventional one has a limited adjustment range, it is likely to be over-adjusted, and as a result, the adjustment of the gap between the handle grip and the lever portion of the braking lever may affect the return position of the master cylinder piston. . That is, since the adjustment has a small width, if excessive adjustment is performed, the piston fitted in the cylinder bore of the master cylinder cannot return to the predetermined return position, and the piston cup (primary cup) moves the cylinder bore of the master cylinder. Stop at a position in front of the relief port that communicates with the reserve tank. In this way, when the primary cup of the piston stops at a position in front of the relief port in the brake released state (treatment position where the braking lever is lightly gripped), the cylinder bore of the master cylinder is not communicated with the reserve tank, so the hydraulic pressure is applied to the wheel cylinder. Is held, which causes the brake to drag. This is a problem that occurs because the adjustment range of the initial position (return position) of the lever portion of the brake lever is small and the adjustment affects the return position of the piston of the master cylinder.

Therefore, in the present invention, the initial position (return position,
That is, the adjustment range of the position where the braking lever is lightly gripped) can be widened, and only the return position of the lever portion can be adjusted regardless of the return position of the piston. The task is to be able to make the fine adjustments.

[Means taken to solve the problem]

The measures taken to solve the above-mentioned problems are constituted by the following elements (a) and (b).

(B) The braking lever is divided into a piston pressing part that presses the piston of the master cylinder and a lever part to which an operation input is given, and they are formed separately, and the assembly position of this piston pressing part and the lever part is changed. (B) An adjusting screw is provided on the pressing portion and the tip of the adjusting screw is brought into contact with the piston of the master cylinder.

[Work]

Since the relative mounting position of the piston pressing part to the lever part can be changed as appropriate, the return position of the piston pressing part is changed by changing the relative mounting position of the piston pressing part and the lever part. It is possible to change only the return position of the lever portion without performing the above. Further, since the piston pressing portion pushes the piston of the master cylinder via the adjustment screw, the return position of the piston pressing portion can be adjusted by adjusting the withdrawal / removal of the adjustment screw, and thereby the return position of the lever portion is finely adjusted. be able to.

Therefore, the return position of the lever part can be adjusted by adjusting the relative assembly position of the piston pressing part and the lever part, and the return position of the lever part can be finely adjusted by adjusting the adjusting screw. By these two adjustments, the return position of the brake lever, that is, the initial position where the brake lever is lightly gripped, can be easily, easily and finely adjusted without changing the return position of the piston forward, and therefore the brake release state ( It is possible to easily, easily and finely adjust the distance between the lever portion and the handle grip when the master cylinder piston is completely returned) to the desired distance D.

〔Example〕

Next, an embodiment will be described with reference to FIGS. 1 to 5 of the present invention.

1 to 3 show an embodiment applied to a steering wheel brake of a motorcycle. In the figure, reference numeral 1 is a handle, and a master cylinder 2 is fastened and fixed to the handle 1 by a fastening bolt 3 screwed to a mounting portion 2a thereof. A lever mounting portion 4 is integrally formed on the master cylinder 2,
A braking lever 5 is rotatably supported by the lever mounting portion 4 via a support shaft 6.

As shown in FIG. 3, the braking lever 5 is composed of a piston pressing portion 7 and a lever portion 8 which are separately formed. A boss portion 10 having a shaft hole 9 in the piston pressing portion 7.
And an adjustment screw attachment portion 13 having an arc-shaped adjustment groove 11 and an adjustment screw insertion hole 12 with the boss portion 10 as a fulcrum. On the other hand, the lever portion 8 is formed with a shaft hole 14 and an adjustment bolt insertion hole 15.

The lever portion 8 has a shaft hole 14 rotatably inserted into a boss portion 10 of the piston pressing portion 7, and the lever portion 8 and the piston pressing portion 7 are arranged such that the support shaft 6 is fitted in the shaft hole 9 of the piston pressing portion 7. It is inserted and is rotatably supported by the lever mounting portion 4 of the master cylinder 2. Then, in the lever portion 8, the adjustment bolt 16 is inserted into the piston pressing portion 7 through the adjustment bolt insertion hole 15 of the lever portion 8 into the adjustment groove 11 of the piston pressing portion 7, and is tightened with the nut 17. The lever portion 8 is located at a predetermined distance D from the grip 1a, and this is the initial position of the braking lever 5.

An adjusting screw 18 is inserted into the adjusting screw attachment portion 13 of the piston pressing portion 7 in the cylinder axis direction of the master cylinder 2, and the tip of the adjusting screw 18 pushes the piston 19 fitted in the master cylinder 2. It has become. When the adjusting screw 18 is rotated, it moves in the cylinder axis direction, and the gap L between the head of the piston 19 and
Adjustment of 1 is performed.

The piston 19 of the master cylinder 2 is reciprocally fitted in a cylinder body 20, and a reserve tank 21 is integrally formed above the cylinder body 20. The reserve tank 21 is connected to the liquid chambers 24, 25 of the cylinder main body 20 via an inlet port 22 and a relief port 23.
Is in communication with. The piston 19 is a cylinder body 20.
The built-in return spring 26 biases the piston 19 toward the piston pressing portion, and the position of the piston 19 is restricted by the stopper 27 locked at the opening end of the cylinder body 20.
The flange portion 19a of the piston 19 comes into contact with the. A secondary cup 28 and a primary cup 29, which are piston cups, are attached to the piston 19, and when the position of the primary cup 29 is at an initial position where the braking lever 5 does not press the piston 19, the primary cup 29 is located behind the relief port 23. The gap L2 is set so as not to block the port on the side.

A brake hose 30 is connected to the tip of the cylinder body 20 via a pipe joint 31, and the other end of the brake hose 30 is connected to a caliper 33 of a disc brake 32. The caliper 33 is fixed to the vehicle body side via a bracket (not shown) and straddles the outer circumference of a brake disc 34 that rotates integrally with the wheels. Brake disc 34
Friction pads 35 are disposed on both sides of the friction pad 35, and the friction pads 35 can be pushed in the disc axial direction by a piston 37 fitted in a cylinder 36.

Next, the operation of this embodiment will be described.

The driver grips the grip 1a of the steering wheel 1 and the lever portion 8 of the braking lever 5, and pulls the lever portion 8 in the grip direction. As a result, the lever portion 8 and the piston pressing portion 7 are integrated with the braking lever 5 as shown in FIG. 1, and the support shaft 6 pivotally supported by the lever mounting portion 4 of the master cylinder 2 is used as a fulcrum to rotate clockwise. Turn to. As a result, the adjusting screw 18 presses the head of the piston 19 as shown in FIG. Therefore, the piston 19 moves forward in the cylinder main body 20 against the return spring 26, and as the piston 19 moves forward, some brake fluid initially returns from the relief port 23 to the reserve tank 21, but the primary cup 29 Passes past the relief port 23, the brake fluid in front of the primary cup 29 is compressed to generate fluid pressure, which is sent to each cylinder 36 formed in the caliper 33 of the disc brake 32 through the pipe joint 31 and the brake hose 3. To be As a result, the piston 37 is advanced toward the brake disc 34, and the friction pad 35 is brought into sliding contact with the brake disc 34 for braking.

Then, when the operating force of the braking lever 5 is released, the piston 19 of the cylinder body 20 is advanced by the return spring 26, the flange portion 19a of the piston 19 abuts the stopper 27, and the primary cup 29 moves from the relief port 23 to the inlet port. It returns to the original position shown in FIG. When the piston 19 moves backward, the brake fluid enters the fluid chamber on the side of the brake hose from around the primary cup 29. Since this fluid chamber communicates with the reserve tank 21 via the relief port 23, the release of braking is performed. Brake drag, which is sometimes caused by an increase in hydraulic pressure on the brake side, does not occur.

In this braking, the play of the brake is the distance from when the braking lever 5 is started to when the brake lever is responded to. The play is the clearance L1 between the adjusting screw 18 and the head of the piston 19, the primary cup 29 and the relief port 23. It is determined by a gap L2 therebetween and a gap (not shown) between the brake friction pad 35 and the brake disc 34.
Therefore, by adjusting the gap L1 with the adjusting screw 18, the gap L1 is further eliminated, the piston 19 is moved to adjust the gap L2, and further the gap between the friction pad 35 and the brake disc 34 is adjusted. ,
It is possible to obtain a predetermined brake play according to the driver.

By the way, since there are differences in the size of the hand depending on the driver or the lever position where the operation is easy to perform, the adjustment bolt 16 of the braking lever 5 is loosened to loosen the lever portion 8.
And the assembly position of the piston pressing portion 7 is changed. Thereby, the distance D between the lever portion 8 and the grip 1a of the steering wheel 1 is easily selected according to the driver. By this adjustment of the lever position, the piston pressing portion 7 is held at a predetermined position, and the gap L1 between the tip end portion of the adjusting screw 18 and the head portion of the piston 19 is maintained constant without changing.

Therefore, the primary cup 29 becomes the relief port 2
Since the initial position of the brake lever 5 may be set to a position exceeding 3, the brake fluid that has flowed into the fluid chamber on the brake hose 30 side when the brake is released and the piston 19 returns to the initial position is released from the relief port 23. From reserve tank 2
It returns to 1 and the hydraulic pressure is released so that the brake does not drag.

FIG. 4 shows another embodiment of the braking lever 5, in which a concave groove 38 is formed in the piston pressing portion 7 in the same direction as the adjusting screw insertion hole 12, and the support shaft 6 provided in the concave groove 38 The lever portion 8 and the piston pressing portion 7 are rotatably supported by the master cylinder 2.

An elliptical cam 39 is rotatably provided by a support pin 40 in the concave groove 38 of the piston pressing portion 7, and the cam 39 is supported at a position deviated to one side in the longitudinal direction. . Further, a pair of engaging portions 41 are formed on the outer peripheral portion of the cam 39 symmetrically in the longitudinal direction with the support pin 40 as a fulcrum. A hole 42 is formed in the piston pressing portion 7 toward the concave groove 38, a ball 43 is mounted in the hole 42, and the ball 43 is attached to the engaging portion 41 by a spring 44 mounted in the hole 42. The cam 39 is pressed against and regulates the rotation of the cam 39. The cam 39 is forcibly rotated so that the ball 43 is attached to either one of the pair of engaging portions 41, 41.
By selectively engaging with, it is possible to selectively change the relative positional relationship between the lever portion 8 and the piston pressing portion 7 in a two-step manner, whereby the initial position of the braking lever 5 can be changed in two steps. Can be adjusted to.

In both the braking lever 5 shown in FIGS. 1 to 3 and the braking lever 5 shown in FIG. 4, the lever portion 8 rotates together with the piston pressing portion 7 on the master cylinder 2 via the same support shaft 6. Although it is supported so as to be possible, the piston pressing portion 7 may be supported by the master cylinder 2, and the lever portion 8 may be rotatably supported by the piston pressing portion 7. Further, the adjustment of the assembling position of the piston pressing portion 7 and the lever portion 8 of the braking lever 5 is not limited to the above-mentioned embodiment, but both may be formed separately and the assembling position can be arbitrarily adjusted. Good.

FIG. 5 shows another embodiment, in which a bracket 46 is attached to a down tube 45 which constitutes a vehicle body frame of a motorcycle.
Are welded, and the master cylinder 2 is assembled to the bracket 46. Cylinder book 20 of master cylinder 2
The reserve tank 21 and the reserve tank 21 are formed separately, and the cylinder axis of the cylinder body 20 is oriented vertically.
1 is attached above the cylinder body 20 and communicates with the cylinder body 20 via a connecting pipe 47. The piston 19 fitted in the cylinder body 20 is pushed by the adjusting screw 18 attached to the braking lever 5 via the rod 48.

An adjusting screw 18 is rotatably supported by the piston pressing portion 7, and the piston pressing portion 7 and the lever portion 8 are rotatably supported by a bracket 46 via a support shaft 49. The position of the piston pressing portion 7 is regulated by a stopper 50 provided on the down tube 45, and the lever portion 8 and the piston pressing portion 7 are always urged in the proximity direction by a spring 51. The piston pressing portion 7 is provided with a shaft support piece 52, and the shaft support piece 52 has an adjusting bolt 53.
Has been inserted. The lever portion 8 is in contact with the head of the adjusting bolt 53, and the adjusting bolt 53 and the nut 54 adjust the assembly position of the piston pressing portion 7 and the lever portion 8.

When the driver puts his foot on the lever portion 8 of the braking lever 5 and depresses it, the lever portion 8 and the piston pressing portion 7 integrally rotate in the clockwise direction with the support shaft 49 as a fulcrum. This allows
The adjusting screw 18 moves upward, and the piston 19 of the cylinder body 20 is pushed upward via the rod 48 to pressurize the brake fluid and operate the disc brake 32.

The initial position of the braking lever 5 is set by the assembly position of the lever portion 8 and the piston pressing portion 7, and the adjustment of the assembly position is urged by the spring 51 when the adjustment bolt 53 is moved in the axial direction. The lever portion 8 follows the movement and rotates about the support shaft 49 as a fulcrum. As a result, the position of the step portion of the lever portion 8 changes in the vertical direction, and the initial position of the braking lever 5 is adjusted.

〔The invention's effect〕

As described above, according to the present invention, the initial position of the braking lever can be adjusted by changing the assembling positions of the piston pressing portion and the lever portion, which are formed separately from each other. The position of the piston pressing part does not change. Therefore, the return position of the piston does not change forward with the adjustment of the initial position of the braking lever, and the primary cup of the piston of the master cylinder does not stop at a position in front of the relief port.
Therefore, in the brake released state, the hydraulic pressure in the master cylinder is always released to the reserve tank via the relief port,
The drag of the brake caused by the primary cup closing the relief port is prevented.

Further, since the adjusting screw is provided on the piston pressing portion and the tip of the adjusting screw is brought into contact with the piston of the master cylinder, the return position of the piston pressing portion can be adjusted by adjusting the withdrawal of the adjusting screw. The return position of the section can be finely adjusted.

Therefore, the return position of the lever part can be adjusted by adjusting the relative assembly position of the piston pressing part and the lever part, and the return position of the lever part can be finely adjusted by adjusting the adjusting screw. By these two adjustments, the return position of the braking lever, that is, the initial position can be easily, easily and finely adjusted without changing the return position of the piston forward, and therefore the lever portion and the handle 1 in the brake released state can be adjusted. It is possible to easily, easily and finely adjust the distance from the grip to the desired distance D.

It is noted that the one disclosed in Japanese Patent Laid-Open No. 59-216777 is known as one that can solve some of the problems of the present invention, but this is one in which a braking lever presses a piston of a master cylinder. Part and a lever part to which an operation input is applied are formed separately so that the assembling position of the piston pressing part and the lever part can be changed, and the adjustment mechanism therefor is characterized. Is to have. This is not fixed to each other through the piston pressing part, the lever part, the adjusting bolt and the connecting pin, and is not fixed to each other. The piston is directly pushed by the pushing portion of the piston. Therefore, there is a high possibility that the lever portion and the piston pressing portion will vibrate relatively while the vehicle is running in a state where the braking lever is completely released, which is not only unstable, but also the lever portion and the handle grip. The adjustment of the interval of is exclusively performed by adjusting the relative positional relationship between the piston pressing portion and the lever portion. On the other hand, according to the present invention, the distance between the lever portion and the handle grip is adjusted roughly by adjusting the assembling position of the lever portion and the piston pressing portion (the positional relationship when they are fixed to each other). Since it can be finely adjusted by adjusting the adjusting screw provided on the part, the above-mentioned adjustment of the interval can be performed easily, easily and finely, and the braking lever is completely released. In this state, the lever portion and the piston pressing portion do not vibrate relatively while the vehicle is traveling, and the lever is stable.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment in which the present invention is applied to a handle brake, FIG. 2 is a sectional view of a master cylinder and a brake to which the present invention is applied, FIG. 3 is an exploded perspective view of a braking lever, and FIG. FIG. 5 is a plan view of another embodiment of the braking lever, and FIG. 5 is a sectional view of another embodiment of the braking lever to which the present invention is applied. 1 ... Handle, 1a ... Handle grip, 2 ... Master cylinder, 5 ... Braking lever, 7 ... Piston pressing part, 8 ... Lever part 18 ... Adjusting screw, 19 ... Piston.

Claims (1)

[Claims] 1. A brake lever is rotatably provided on a fixed body, and when the brake lever is operated, a piston fitted to a master cylinder is pushed to generate hydraulic pressure, and the initial position of the brake lever is set. In a vehicle brake lever position adjusting device adapted to be adjusted, the brake lever is divided into a piston pressing portion for pressing the piston of the master cylinder and a lever portion to which an operation input is applied, and is formed separately.
The initial position of the braking lever is adjusted by changing the assembling position of the piston pressing part and the lever part.
A braking lever position adjusting device for a vehicle, in which an adjusting screw is provided on the pressing portion and the tip of the adjusting screw is brought into contact with the piston of the master cylinder.