JPH0437834Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a hydraulic master cylinder device for a bar-handle vehicle that hydraulically operates a brake or a clutch, and particularly includes an adjuster for adjusting the gripping distance of an operating lever. The present invention relates to a hydraulic master cylinder device for a vehicle.

[Conventional technology]

In hydraulic master cylinder devices that hydraulically operate the front brakes and clutches of motorcycles, etc., the grip distance between the bar handle grip and the operating lever is
For example, there is a brake lever adjustment device for a vehicle hydraulic braking device disclosed in Japanese Utility Model Publication No. 53-8114, which is equipped with an adjuster so that adjustment can be made according to the rider's physique and preferences.

This technology involves inserting the push rod of the hydraulic master cylinder into a through hole provided in the working arm of the brake lever, pinching the working arm, and screwing two sets of double nuts onto the push rod. An adjuster is constructed by loading a spring between the brake lever and the brake lever. The grip distance can be adjusted.

[Problem that the invention attempts to solve]

However, in the above-mentioned device, as stated in the claims, if the front and rear portions of the working arm are clamped and fixed with double nuts, the piston may pry the cylinder hole and prevent smooth operation. It was hot.

In addition, since the spring that springs the brake lever is installed close to the pivot shaft of the brake lever, a large diameter spring with a large set load must be used, making it difficult to install the spring in a fixed space. This was causing problems with the placement.

The present invention was developed against the background of the above circumstances, and aims to provide a hydraulic master cylinder device for a vehicle, which is equipped with an adjuster for adjusting the gripping distance, which allows smooth hydraulic operation, is simple and inexpensive. The purpose is

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention adjusts the gripping distance of the operating lever between the piston inserted into the cylinder hole of the hydraulic master cylinder and the operating arm of the operating lever that pushes the piston. In a hydraulic master cylinder device for a vehicle equipped with an adjuster, the adjustment bolt is protruded from the piston by screwing a threaded portion formed on one end side of the adjustment bolt into the rear end of the piston, and the adjustment bolt is protruded from the piston, and the operation lever A through hole is formed in the working arm of the adjusting bolt, the insertion shaft on the other end side of the adjusting bolt is inserted into the through hole, and the working arm is biased in the action direction between the insertion shaft and the through hole. At the same time, a return spring for adjusting the adjustment bolt is provided between the threaded portion and the insertion shaft portion of the adjustment bolt, and the adjustment knob for screw rotation is brought into contact with and supported by the working surface of the tip of the working arm. It is characterized by being composed of

〔Example〕

An embodiment in which the present invention is applied to a front disc brake of a motorcycle or the like will be described below with reference to FIGS. 1 to 3.

The hydraulic master cylinder 1 is connected to the accelerator grip 2
and the switch unit 3 are attached to the right side of the bar handle 4, to which they are connected, via a bracket half 5 with a bolt 6.

In the hydraulic master cylinder 1, a reservoir 10 for storing hydraulic fluid is integrally provided at the upper part of a cylinder body 9 in which a piston 8 is inserted into a cylinder hole 7.
The support arm 15a of the brake lever 15 is connected to the support pin 16 between a pair of upper and lower lever holders 14, 14 extending from the cylinder body 9. It is supported by

Between the piston 8 and the bottom of the cylinder hole 7,
A hydraulic pressure chamber 17 is defined, and the piston 8 is compressed by a return spring 18 that is compressed in the hydraulic pressure chamber 17.
It is urged to the retracting limit position where it comes into contact with a circlip 19 serving as a stopper, and a dustproof boot 20 is attached to the opening 7a of the cylinder hole 7 and the rear end of the piston 8 that projects from the opening 7a. An adjuster 21 is interposed between the piston 8 and the operating arm 15b of the brake lever 15.

The adjuster 21 is provided so that the gripping distance between the grip portion 15c of the brake lever 15 and the accelerator grip 2 can be adjusted according to the physique and preference of the rider. , adjustment knob 2
3. Return spring 24, lock nut 25
, washers 26, 27, and a nut 28.

In the brake lever 15, a through hole 29 is formed in an operating arm 15b which is bulged to have a substantially circular cross section. It is composed of a hole-shaped through hole 29a and a conical through hole 29b that is continuous with the through hole 29a and opens on the side opposite to the piston.

The adjusting bolt 22 has a threaded portion 22a at one end and an insertion shaft portion 22b inserted into the through hole 29 at the other end. An adjusting knob 23 is integrally provided, and the adjusting bolt 22 has a threaded portion 22a screwed onto the female thread 8a of the piston 8.
It is fixed with a lock nut 25 and protrudes from the rear end of the piston 8, and the insertion shaft portion 22b is inserted into the through hole 30.

A washer 26 is secured to the end of the insertion shaft portion 22b with a nut 28, and the washer 26 and the through hole 2
A tapered return spring 24 is compressed between washers 27 inserted into the bottom of the spring 9b.
Due to the contraction of the return spring 24, the brake lever 15 has a working surface 15d of the working arm 15b.
is urged in the direction of action in which it is abutted and supported by the adjustment knob 23 without wobbling.

The present embodiment is constructed as described above, and the grip portion 15c of the brake lever 15 is gripped and operated.The lever 15 rotates about the support pin 16, and the operating arm 1
The operating surface 15d of the actuator 5b operates the adjustment knob 23 to advance the adjusting bolt 22 and the piston 8, thereby generating pressure fluid in the hydraulic chamber 17.

The pressure fluid in the hydraulic pressure chamber 17 is sent to the caliper of the front disc brake through a brake hose connected to the outlet 9a, and the caliper is actuated to brake the front wheels.

In addition, the gripping distance of the brake lever 15 can be adjusted using the lock nut 25 that fixes the adjustment bolt 22.
After loosening the adjustment bolt 22 and rotating the adjustment knob 23 in the direction in which the adjustment bolt 22 is screwed in or screwed out to adjust the gripping margin, the adjustment bolt 22 is tightened and fixed with the lock nut 25.

FIG. 4 shows another embodiment of the present invention, in which the through hole 30 formed in the working arm 15e is a through hole 30 formed in the working arm 15e by opening the through holes 29a and 29b of the previous embodiment on the end side of the working arm 15e. It is configured with holes 30a and 30b so that the insertion shaft portion 22b of the adjusting bolt 22 can be inserted more easily.

In the adjuster of the above embodiment, the washer 27 on the through hole 29 side may be omitted, and a circlip or the like may be used in place of the combination of the washer 26 and nut 28 on the adjuster 22 side.

According to both embodiments, the grip has a simple structure with a small number of components and can be manufactured at low cost, and the gripping distance can be easily adjusted. In addition, since the operating surface 15d of the brake lever 15 is spherical, the adjustment knob 23
The piston 8 can be operated smoothly with less twisting and no tilting of the adjuster bolt 22.

Further, since the brake lever 15 has a structure in which the operating surface 15d is supported by the return spring 24 in contact with the adjustment knob 23, the brake lever 15 is not rattled due to vibrations during driving, and braking operations can be performed reliably.

Furthermore, since the return spring 24 that biases the brake lever 15 is disposed near the action surface 15d away from the support pin 16, it may have a small diameter that has a small set load and is easy to set.

[Effect of idea]

As explained above, in the present invention, between the piston inserted into the cylinder hole of the hydraulic master cylinder and the operating arm of the operating lever that pushes the piston,
In a vehicle hydraulic master cylinder device equipped with an adjuster that adjusts the gripping distance of the operating lever, a piston inserted into the hydraulic master cylinder has a
A threaded portion formed on one end of the adjusting bolt is screwed to protrude from the piston, a through hole is formed in the operating arm of the operating lever, and the other end of the adjusting bolt is inserted into the through hole. A return spring is compressed between the insertion shaft and the through hole to bias the working arm in the action direction, and a return spring is installed between the insertion shaft and the through hole. Since the adjuster is constructed by providing a screw adjustment knob in between and supporting the operating surface of the tip of the operating arm in contact with the adjustment knob, it can be manufactured at low cost with a simple structure that has few components, and also has a small gripping allowance. Adjustment is simple and easy, and the tilting of the adjuster bolt is eliminated, allowing the piston to operate smoothly.

Furthermore, since the return spring that biases the brake lever is disposed near the operating surface away from the support pin, it can be of small diameter with a small set load and easy to set, making it easy to perform delicate lever operations.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, in which FIG. 1 is a partial cross-sectional plan view of a hydraulic master cylinder device, FIG. 2 is a cross-sectional view of FIG.
The figure is a sectional view taken along the line 1 in FIG. 1, and FIG. 4 is a sectional view showing a main part of another embodiment. DESCRIPTION OF SYMBOLS 1... Hydraulic pressure master cylinder, 7... Cylinder hole, 7a... Cylinder hole opening, 8... Piston, 9... Cylinder body, 10... Reservoir,
15... Brake lever, 15a... Support arm, 1
5b, 15e... Working arm, 15c... Gripping part, 1
5d... Working surface, 16... Support pin, 21... Adjuster, 22... Adjuster bolt, 22a...
...Screw part, 22b...Insertion shaft part, 23...Adjustment knob, 24...Return spring, 25...Lock nut, 29, 30...Through hole, 29a, 2
9b, 30a, 30b... through holes.

Claims (1)

[Scope of utility model registration request] A hydraulic master cylinder device for a vehicle in which an adjuster for adjusting the gripping distance of an operating lever is interposed between a piston inserted into a cylinder hole of a hydraulic master cylinder and an operating arm of an operating lever that pushes the piston. In this method, a threaded portion formed at one end of the adjusting bolt is screwed onto the rear end of the piston so that the adjusting bolt projects from the piston, and a through hole is formed in the operating arm of the operating lever. The insertion shaft on the other end side of the adjusting bolt is inserted into the through hole, and a return spring is compressed between the insertion shaft and the through hole to bias the operating arm in the action direction.
A vehicle characterized in that an adjusting knob is provided for screwing between the threaded portion and the insertion shaft of the adjusting bolt, and the adjusting knob abuts and supports the working surface of the tip of the working arm to constitute an adjuster. Hydraulic master cylinder device.