JPS62152993A - Operating lever of hydraulic master cylinder for car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operating lever for operating a hydraulic master cylinder attached to a bar handle of a motorcycle, tricycle, buggy, or the like.

[Conventional technology]

In this type of vehicle where the front wheels are steered by a bar handle, a hydraulic master cylinder that hydraulically operates the brakes and clutches is installed inside the grip of the bar handle, and the operating lever, which is supported by the bracket of the master cylinder, is moved toward the front of the grip. However, in recent years, it has become desirable to be able to adjust the gripping distance of the operating lever as appropriate depending on the rider's preference, palm size, or operating feel.

Figure 1 shows a conventional example of this type of technology. Inside an accelerator grip 2 rotatably supported on a bar handle 1 that steers the front wheels, there is a hydraulic master that hydraulically operates the front wheel brakes. A brake lever 5 is rotatably supported by a support shaft 6 on a bracket 3a extending from the master cylinder 3 to which a cylinder 3 is fixed.

The brake lever 5 pushes a lever part 5a disposed in front of the accelerator grip 2 and the rear end of a piston 7 that protrudes from the cylinder opening end of the master cylinder 3, thereby supplying pressure fluid to a hydraulic pressure chamber at the bottom of the cylinder. The working arm 5b has an operating arm 5b that generates a movement, and a stopper arm 5C that regulates the backward limit when braking is not applied.The operating arm 5b has an adjustment bolt 8 for adjusting the amount of lever play, and the stopper arm 5C has an adjustment bolt 8 for adjusting the lever return position. Adjustment bolts 9 for adjustment are screwed together with lock nuts 10 and 10, and a return spring 11 for biasing the brake lever 5 in the non-braking direction is compressed between the bracket 3a and the operating arm 5b. ing.

Brake lever 5 biased by return spring 11
The rear end of the adjustment bolt 9 is regulated by the contact between the tip 9a of the adjustment bolt 9 and the front side wall surface 3b of the hydraulic master cylinder 3, and the rear end of the piston 7 and the tip 8a of the adjustment bolt 8 are By changing the amount of protrusion of the tips 8a and 9a of each bolt 8.9, the amount of play and gripping distance of the brake lever 5 can be adjusted.

[Problem to be solved by the invention] However, when the gripping margin is adjusted using the above-mentioned method, the amount of lever play between the tip of the adjustment bolt of the working arm and the rear end of the piston changes in conjunction. , it is troublesome as readjustment is required, and if the adjustment bolt tip of the working arm is brought into contact with the rear end of the piston to eliminate the amount of play in the lever and only the gripping allowance can be adjusted,
If the gripping margin is adjusted in the direction of reduction using the adjustment bolt on the collar arm, there is a risk that the piston will be pushed into the cylinder indefinitely.

Therefore, the present invention, regardless of the adjustment of the gripping distance of the operating lever,
The object of the present invention is to provide an operating lever for a hydraulic master cylinder that can always maintain a piston in a predetermined position during non-braking and generate stable pressure fluid.

[Means for solving problems]

The present invention was made in view of the above-mentioned object, and the rear end of the piston inside the cylinder is faced to the opening of a hydraulic master cylinder fixed to a bar handle. In the operation lever of the vehicle hydraulic master cylinder that is pushed, a hole is formed in the operating arm of the operation lever, and an adjustment bolt for adjusting the operating position of the operation lever is screwed into the hole. An axial groove is formed in the shaft portion of the adjustment bolt, and a locking protrusion is provided in the mounting hole to engage with the engagement recess and regulate the amount of movement of the adjustment bolt. It is something.

[For production]

Therefore, the adjustment bolt moves by the length of the concave groove that engages with the locking protrusion, and this also limits the adjustment width of the gripping distance of the control lever and the amount of movement of the piston of the hydraulic master cylinder. Ru.

〔Example〕

An embodiment in which the present invention is applied to a hydraulic master cylinder for front wheel brakes will be described below with reference to FIGS. 2 and 3.

Incidentally, the same constituent elements as those of the above-mentioned conventional example are given the same reference numerals and the explanation thereof will be omitted.

Brake lever 12 pivotally supported by hydraulic master cylinder 3
The lever 12 has a lever part 12a, an actuating part 12b1 to which adjustment poles l to 13 are screwed, and a collar part 12C.
The contact between the rear end of the piston 7 and the rear end of the piston 7 constantly urges the piston 7 in the non-operating direction.

Further, a recess 3C is formed in the wall surface 3b of the hydraulic master cylinder 3 on the front side of the vehicle body, and the stopper arm 12G of the brake lever 12 comes into contact with the recess 3C to bias the lever 12 in the operating direction. A return spring 14 is provided.

The adjustment bolt 13 has a hemispherical tip 13a, a threaded portion 13b1 that is screwed into a female threaded hole 15 for the adjustment bolt formed on the working arm 12b, and an engagement groove 13G at an opposing position on the outer periphery. The bolt 13 consists of a rotating head 13d carved with a
the engagement groove 13c of the brake lever 12 and the grip portion 1 of the brake lever 12.
Rotation is restricted by engagement with an engaging piece 16 fixedly provided on the inner surface of 2a.

Also, one part of the threaded portion 13b of the adjustment bolt 13 is
- A small diameter shaft portion 13e is formed in the middle of the path, and a concave groove 17 is formed on the outer periphery of the small diameter shaft portion 13e.
is formed, and the locking pin 19 is press-fitted into the through hole 18 of the working arm 1-2b that intersects with the groove 17, and the adjustment bolt 1
The movement path in the axial direction of No. 3 is restricted.

As a result, the gripping distance of the brake lever 12 is adjusted within the engagement range between the concave groove 17 of the adjustment bolt 13 and the locking pin 19, and the amount of movement of the adjustment bolt 13 is
It is set within the idle stroke of the piston 7 before generating pressure fluid.

The return spring 14 is set to be weaker than the elastic force of the return spring in the hydraulic pressure chamber that urges the piston 7 toward the opening of the cylinder, and the brake lever 12 is pushed back in the non-movement direction by the piston 7.
After the screw 1-7 is restricted to its retracting limit, the adjustment bolt 1 is pushed back by the biasing force of the return spring 14.
3 is pressed against the rear end of the piston 7, the brake lever 12 is held without wobbling.

In this embodiment, the amount of movement of the adjustment bolt is set within the idle stroke of the piston, and the generation of hydraulic pressure in the master cylinder is not affected, and stable operation can be achieved, and the adjustment bolt is not engaged. The set position is reliably held by the stopper, and the gripping distance of the lever can be adjusted with one touch.

Although the present embodiment has been described using a brake lever, the present invention is not limited to this, and can also be applied to a clutch lever.

〔Effect of the invention〕

As explained above, in the present invention, a mounting hole is formed in the operating arm of the operating lever that pushes the hydraulic master cylinder fixedly installed on the bar handle, and the operating position of the operating lever is set in the hole. At the same time as screwing the azimuth 1 to the bolt to be adjusted, an axial groove is formed in the shaft portion of the azimuth 1 bolt, and an adjustment pole 1 is inserted into the 4 holes in the four holes by engaging with this groove. - Since a locking protrusion is provided to restrict the amount of movement of the lever, the gripping distance of the operating lever can be adjusted with one touch according to the rider's preference. Since the movement is restricted and over-adjustment of the piston in the master cylinder is prevented, stable operation can be achieved at all times without affecting the generation of hydraulic pressure.

[Brief explanation of drawings]

Figure 1 is a plan view showing how the conventional operating lever is installed.
2 and 3 show an embodiment of the present invention, FIG. 2 is a plan view of the installed state, and FIG. 3 is a sectional view taken along the line 1--2 of FIG. 2. 1...Bar handle 2...Accelerator grip 3
...Hydraulic pressure master cylinder 3b...Wall surface 12
...Brake lever 12b...Action arm 12
c... Stopper arm 13... Adjustment bolt 13'a... Tip 13b... Shaft 13c
...Engagement groove 13d...Head 13e...Small diameter shaft portion 14...Return spring 15...
Female screw hole 16...Engagement piece 17...Concave groove 12
... Locking bottle procedure amendment Self-December 3, 1985 Commissioner of the Patent Office Black 1) Yu Akira 1, Indication of the case 1985 Patent Application No. 296398, Group 2, Title of the invention Hydraulic master cylinder for vehicles Operation lever 3, Relationship with the case of the person making the amendment Patent applicant (532) Honda Motor Co., Ltd.] 4. Agent 5. Date of amendment order Voluntary submission 8. Details of the amendment, page 12, bottom line Set "12...Lock pin" to "1"
9...Locked bottle" is corrected. that's all

Claims (1)

[Claims] 1. Operation of a vehicle hydraulic master cylinder by placing the rear end of the piston in the cylinder facing the opening of the hydraulic master cylinder fixed to the bar handle, and pushing the rear end of the piston with the operating arm of the operating lever. In the lever, a mounting hole is formed in the operating arm of the operating lever, and an adjustment bolt for adjusting the operating position of the operating lever is screwed into the mounting hole, and
A vehicle characterized in that an axial groove is formed in the shaft portion of the adjustment bolt, and a locking protrusion is provided in the mounting hole to engage with the groove and restrict the amount of movement of the adjustment bolt. Operation lever for the hydraulic master cylinder.