JP2001097271A - Operating mechanism of vehicle master cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operating lever of a vehicle master cylinder capable of easily adjusting a grip tolerance (interval) between the operating lever and a handle grip. SOLUTION: This operating lever of a vehicle hydraulic master cylinder is characterized in that an oblong hole 15 is formed in the pivot part of the operating lever 5 of a hydraulic master cylinder and the operating lever 5 is moved in the oblong hole 15 relative to a pivot pin 4 of the lever fitted to the oblong hole so that a distance between the operating lever 5 and a handle grip 2 can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation lever of a master cylinder for a vehicle, and more particularly, to an operation of a master cylinder for a vehicle which can easily adjust a grip margin (interval) between the operation lever and a handle grip. It concerns the mechanism.

[0002]

2. Description of the Related Art Conventionally, an operation mechanism of a master cylinder for a vehicle provided with an adjustment mechanism capable of easily adjusting a grip allowance between an operation lever and a handle grip is disclosed in, for example, Japanese Patent Application Laid-Open No.
The one described in Japanese Patent No. 272482 is well known. The operating mechanism described in Japanese Patent Application Laid-Open No. 9-272482 is provided with an adjusting mechanism for adjusting a grip margin at a rotating portion of a lever body, and a rotating base of the lever body is formed as a pair of upper and lower forked arms. The pivot base of the knocker is inserted into the bifurcated arm, and both pivot bases are pivotally supported on the lever holder of the cylinder body using a pivot. The lever is divided into two parts together with the knocker by this configuration. The backlash in the vertical direction of the main body is minimized to improve the operation feeling of the operation lever.

[0003]

However, in the operating lever having this configuration, the adjusting mechanism for adjusting the distance from the handle grip requires an adjusting pin provided with a cam clutch, which complicates the configuration. Further, since the lever main body is divided into two parts, the main body and the knocker, the number of parts is increased, so that there is a problem that the assembling work is troublesome and the cost increases.

In view of the above, the present invention provides a master cylinder for a vehicle, which comprises an operating lever as one component and an adjusting mechanism which can easily adjust a grip margin with a handle grip using an elongated hole formed in the operating lever. It is an object of the present invention to provide an operation mechanism of the present invention and to solve the above problems.
According to the present invention, the operating lever is formed as one component, an elongated hole is formed at a fulcrum of the operating lever, and the operating lever is elongated by using an adjustment bolt with respect to a fulcrum pin of the lever fitted into the elongated hole. The position is changed while moving in the hole, and as a result, the center of rotation of the operation lever with respect to the operation lever is changed, so that the distance between the operation lever and the handle grip can be adjusted.

[0005]

SUMMARY OF THE INVENTION Accordingly, the technical solution adopted by the present invention is to provide a vehicle master cylinder operating mechanism having an adjusting mechanism for adjusting a distance between an operating lever and a handle grip. An operation lever having a long hole, a fulcrum pin that passes through the long hole and is held by a support portion on the master cylinder side, and penetrates the fulcrum pin,
An adjusting bolt screwed to the operation lever,
An operation mechanism for a master cylinder for a vehicle, wherein a distance between an operation lever and a handle grip can be adjusted by moving an operation lever with respect to the fulcrum pin by rotating the adjustment bolt. A spring for urging the operation lever is disposed around the adjustment bolt between the fulcrum pin and the operation lever, and is a mechanism for operating a vehicle master cylinder.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An operation mechanism of a master cylinder for a vehicle according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a state in which an operation lever of a master cylinder for a vehicle is fixed to a steering wheel. 3 is an enlarged view of a main part of the operation lever, FIG. 3 is a partially cutaway sectional view of FIG. 2, and FIG.
A sectional view, FIG. 5 is a BB sectional view in FIG. 4, and FIG. 6 is a side view of the adjustment bolt.

In FIGS. 1 and 2, reference numeral 1 denotes a handlebar, and a handlebar 2 serving also as an accelerator grip is formed at an end of the handlebar 1. A master cylinder device 3 for front brake is fixed to the handlebar 1 inside the handle grip 2 by a suitable fixing means, and an operation lever 5 centered on a fulcrum pin 4 is provided on the master cylinder device in a manner described later. It is rotatably mounted.

[0008] As shown in FIG.
The cylinder body 3a is provided with a cylinder hole 6 substantially parallel to the handlebar 1, and a piston 7 is provided on the opening side of the cylinder hole 6, and the piston 7 is not shown at the bottom of the cylinder hole 6 (not shown). It is constantly repelled toward the opening by a return spring provided in the hydraulic chamber. The retraction limit of the piston 7 is the stop ring 8 attached to the piston 7.
Abuts on a stopper 9 formed at the opening end of the cylinder hole 6.

The cylinder body 3a of the master cylinder device 3 is formed with a pair of supports 10 for supporting the ends of the fulcrum pins 4 as shown in FIGS. The fulcrum pin 4 has a function as a rotation fulcrum of the operation lever 5, and the fulcrum pin 4 is supported by a support portion 10 in FIG. Fulcrum pin 4
Is formed with a through hole 12 through which an adjustment bolt 11 described later can be passed.

As shown in FIGS. 2 and 3, a piston pressing portion 1 which comes into contact with the piston 7 is provided at an end of the operating lever 5.
3 and a switch pressing portion 14 abutting on an end face 16 of a stop lamp switch formed in the cylinder body 3a are formed in a forked shape, and a long hole 15 through which the above-mentioned fulcrum pin 4 penetrates is formed in the operation lever 5 main body. Are formed.
As shown in FIG. 4, the operation lever 5 is connected to the elongated hole 15 and the fitting hole 1 in which the adjustment bolt 11 is fitted.
7 is formed, and a screw hole 18 for screwing the adjustment bolt 11 is formed at the bottom of this hole.

The adjusting bolt 11 has the shape shown in FIG. 6, and the small-diameter portion 11a is a threaded portion to be screwed into the threaded portion of the fulcrum pin 4 and the large-diameter portion 11b is in contact with the fulcrum pin 4. The recess 11c that engages with the fulcrum pin 4 has a 180 ° symmetrical shape.
It is formed in several places. The rotation base of the operation lever 5 is inserted between the support portions 10 described above, and the fulcrum pin 4 for rotatably supporting the operation lever 5 is penetrated through the elongated hole 15, and the through hole 12 of the fulcrum pin 4 is operated. The adjustment bolt 11 is fitted into the fitting hole 17 of the lever 5, and the adjustment bolt 11
Is screwed into a screw hole 18 formed in the operation lever 5.

A spring 20 surrounding the adjust bolt 11 is disposed between the bottom of the fitting hole 17 and a washer 19 serving also as a spring seat provided on the fulcrum pin 4 side. When the is rotated, the operation lever 5 moves within the range of the elongated hole 15 with respect to the fulcrum pin 4, changes the position of the operation lever 5 with respect to the fulcrum pin 4, and adjusts the distance between the operation lever 5 and the handle grip 2. You can do it. As shown in FIG. 3, in the assembled state, the piston pressing portion 13 of the operation lever 5 is always in contact with the end face of the piston 7, and the switch pressing portion 14 is always in contact with the stop lamp switch end face 16.

Hereinafter, the operation of the operation lever 5 will be described with reference to FIGS. When the distance between the operation lever 5 and the handle grip 2 is the closest to the minimum position,
The fulcrum pin 4 is located above the elongated hole 15 formed in the operation lever 5 ((a) in FIG. 8), and at the farthest maximum position, the fulcrum pin 4 is moved to the elongated hole 15 formed in the operation lever 5. ((B) in FIG. 8).

Now, in order to increase the distance between the operating lever 5 and the handle grip 2, that is, to change the state of FIG. 11a to screw hole 18 of operation lever 5
The operation lever 5 moves to the position shown in FIG. 4B while bending the spring 20 with respect to the fulcrum pin 4. That is, at this time, with respect to the fulcrum pin 4 inserted into the long hole 15 of the operation lever 5, the operation lever 5 moves upward in the drawing within the range of the long hole 15, and the adjustment bolt 1
When the fulcrum pin 4 comes to the lowermost position of the long hole 15 by screwing 1 to the maximum, the distance between the operation lever 5 and the handle grip 2 becomes maximum.

Each time the concave portion 11c formed on the lower surface of the head of the adjust bolt 11 rotates by 180 °, it engages with the fulcrum pin 4 to position the adjust bolt 11. When the operation lever 5 is adjusted, the piston pressing portion 13 provided on the operation lever 5 moves along the end face of the piston 7 as shown in FIG. 7B, and the switch pressing portion 14 also moves toward the cylinder body. Stop lamp switch surface 1 provided
6 only moves along the surface, and does not perform a piston pressing action or a switch pressing action. As a result, even if the interval between the operation levers 5 is adjusted, the contact state between the piston 7 and the end surface 16 of the stop lamp switch does not change.

When the operation lever 5 is gripped after the adjustment of the interval, the operation lever 5 rotates about the fulcrum pin 4, whereby the piston pressing portion 13 presses the piston 7 to perform a braking action. When the switch pressing surface 14 is separated from the stop lamp switch end surface 16, the switch is turned on and the brake lamp is turned on, so that the braking operation can be performed as in the conventional case.

In FIG. 7, the piston pressing portion 13 moves along the end face of the piston 7 when adjusting the distance between the operating lever 5 and the handle grip 2 while screwing the adjusting bolt 11 forward. FIG. 3 shows a locus diagram showing how the 移動 moves on the stop lamp switch surface 16 along each surface. In this figure, when the operation lever 5 is adjusted, it is ideal that the piston pressing portion 13 moves the end face of the piston 7 and the switch pressing portion 14 moves the rotation center of the long hole 15 without separating from the stop lamp switch surface 16 ( In the present invention, the rotation center of the long hole 15 is moved along an approximate straight line approximating the actual locus as shown in the figure. ing. This approximate movement causes a state in which the piston 7 pressing portion is separated from the end surface of the piston 7 by a small distance, but this is within the range of the play of the brake, and there is no practical inconvenience.

Also, while the present invention has been described with reference to a hydraulically actuated brake mechanism, the invention may be embodied in various other forms without departing from its spirit or essential features, including mechanically actuated brake mechanisms. it can. Therefore, the above-described embodiment is merely an example in every aspect, and should not be construed as limiting.

[0019]

As described in detail above, according to the present invention,
Since the operation lever can be configured as one part,
The number of parts can be reduced, and the cost can be reduced. Further, the distance between the operation lever and the handlebar can be freely selected between the maximum separation position and the minimum separation position by the adjustment bolt according to the driver. Since the positioning is performed by engaging the recess formed in the large diameter portion of the adjustment bolt with the fulcrum pin, the adjustment bolt does not loosen. In addition, no matter where the fulcrum pin is located in the elongated hole formed in the operation lever, the piston pressing portion moves substantially parallel to the piston end surface.
The brake does not act during the adjustment, and excellent effects such as the same brake feeling as the conventional operation lever can be obtained when the brake is applied.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which an operation lever of a vehicle master cylinder according to the present invention is fixed to a handlebar.

FIG. 2 is an enlarged view of a main part of the operation lever of FIG.

FIG. 3 is a partially cutaway sectional view of FIG. 2;

FIG. 4 is a sectional view taken along line AA in FIG. 2;

FIG. 5 is a sectional view taken along line BB in FIG.

FIG. 6 is a side view of the adjustment bolt.

FIGS. 7A and 7B are diagrams showing a state of an operation lever when an adjustment bolt is screwed in, and a locus diagram of a piston pressing portion, a switch pressing portion, and a long hole when the adjustment bolt is screwed in;

8A is a diagram showing a state of a minimum position where the distance between the operation lever and the handle grip is closest, and FIG. 8B is a diagram showing a state of a maximum position where the distance is farthest.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handle bar 2 Handle grip 3 Master cylinder device 4 Support pin 5 Operating lever 6 Cylinder hole 7 Piston 8 Stop ring 9 Stopper 10 Supporting part 11 Adjust bolt 12 Through hole 13 Piston pressing part 14 Switch pressing part 15 Slot 16 Stop lamp switch End face 17 Fitting hole 18 Screw hole 19 Washer 20 Spring

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroaki Nakamura 19-5 Nihonbashi Koamicho, Chuo-ku, Tokyo F-term in Akebono Brake Industry Co., Ltd. 3J070 AA03 BA24 BA81 CA42 CC04 DA04

Claims (2)

[Claims] 1. An operating mechanism for a vehicle master cylinder 3 having an adjusting mechanism for adjusting a distance between an operating lever 5 and a handle grip 2, wherein the operating lever 5 has an elongated hole 15 at a fulcrum. Through the master cylinder 3
A fulcrum pin 4 held by a supporting portion on the side and an adjustment bolt 11 that penetrates the fulcrum pin 4 and is screwed to the operation lever 5. The fulcrum pin 4 is rotated by rotating the adjustment bolt 11. The operation mechanism of the master cylinder for a vehicle, wherein the distance between the operation lever 5 and the handle grip 2 can be adjusted by moving the operation lever 5 with respect to the master cylinder. 2. The operation of the vehicle master cylinder according to claim 1, wherein a spring for urging the operation lever is disposed around the adjustment bolt between the fulcrum pin and the operation lever. mechanism.