JPS6230871Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a brake master cylinder for motorcycles,
Regarding the rotation axis of the operating lever that drives the clutch master cylinder, more specifically, the pivot pin, which is a lever support pin, can be easily incorporated, and the mirror shaft can prevent the pivot pin from wobbling. This invention relates to a rotating shaft of a two-wheeled vehicle operating lever in which deformation of the shaft does not reach the pivot pin.

To explain the conventional technology, a side mirror mounting shaft hole/lever bolt hole is drilled in the master cylinder body, the side mirror mounting shaft hole/lever bolt is attached to the hole, and an operating lever is rotatably provided with respect to the shaft. In the side mirror mounting mechanism for a master cylinder for two-wheeled vehicles (Utility Model Application No. 128244, 1982), when the two-wheeled vehicle falls over, the external force applied to the side mirror mounting shaft extends to the lever bolt, which impedes the rotation of the lever. .

Next, a pair of upper and lower brackets is formed on the cylinder body equipped with an oil tank at the top, and the base of the operating lever that drives the actuating piston in the cylinder body is inserted between these two brackets. A two-wheeled vehicle, wherein a base end of a pivoting bolt is supported by the lower bracket, a tip part thereof is supported by the upper bracket, and a back mirror mounting boss is integrally provided on the upper surface of the upper bracket directly above the bolt. In the case of a master cylinder for use in a motor vehicle (Utility Model Publication No. 56-138754), the bolt, that is, the pivot pin of the operating lever, is screwed into the lower arm of the lever body, which increases the number of processing steps and assembly steps.

Furthermore, a brake lever bracket is attached to the handlebar of the bicycle, a bolt having a band for wrapping the handlebar is installed horizontally on the bracket, and the bracket is screwed onto a shaft to which the brake lever is pivoted. By tightening the nut, the mirror is tightly attached to the handlebar, and a screw hole is provided at the end of the pivot shaft, and the mirror support bar, which has a mounting hole, is screwed into this, and the mirror is attached to the bracket. On bicycles with mirrors mounted on bicycles, it is difficult to tighten the nuts because they are prevented by levers, and if the mirror is installed vertically, there are problems such as the mirror cannot be held reliably when vibrations are applied to the bicycle body. It has its drawbacks.

This idea was made in view of the above points,
The purpose of this is to clamp the rotating part of the operating lever between the upper and lower brackets, provide a mirror shaft hole through the upper bracket to form a female threaded part, and form a female threaded part below the mirror shaft hole. A lever pin hole with the same diameter or smaller diameter than the mirror shaft hole is installed vertically in the lower bracket, and the pivot pin is inserted through the lever rotation hole and the lever pin hole to pivot the operating lever, and the compressed elastic To provide a rotating shaft for a two-wheeled vehicle operating lever, characterized in that the upper part of a pivot pin is brought into contact with the lower end of a mirror shaft screwed into a mirror shaft hole through the body.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a plan view of a brake master cylinder 10 for a motorcycle. The cylinder body 12 of the brake master cylinder is provided with an oil tank 14 on the upper part, and a handle holder part 18 is integrally formed on the handle pipe 16 side of the motorcycle.

In FIG. 1, an upper bracket 20 and a lower bracket 22 are integrally protruded from the front surface of the right end of the cylinder body in the direction in which the motorcycle travels, and are opposed to each other at a constant interval. A base portion 46 serving as a rotating portion of the operating lever 44 is inserted between the upper and lower brackets 20 and 22.

As shown in FIG. 2, the upper bracket 20 has a vertically elongated shape, and a mirror shaft hole 24 is formed downward from the upper surface of the upper bracket 20. The mirror shaft hole 24 is cut almost vertically and has a shape slightly tilted forward. A portion of the lower portion of the mirror shaft hole 24 is left with a slightly reduced diameter, and a female screw portion 26 is formed over almost the entire length thereof. A lever pin hole 28 is vertically provided on the lower bracket 22 along the axis of the mirror shaft hole 24, the diameter of which is smaller than that of the mirror shaft hole 24, and the lower part of which has a blind hole shape. A small hole 30 for extrusion is bored in the bottom of the lever pin hole 28. A pivot pin 32, which is a lever support pin, is inserted through the mirror shaft hole, passes through the rotation hole 34 of the operating lever 44 and the lever pin hole 28, and pivotally supports the operating lever 44. The pivot pin 32 has a head 36 with an enlarged diameter at its upper end;
This head 36 is supported in the mirror shaft hole 24. A rubber disk 38 as an elastic body is placed on the head.

Next, the lower part of the mirror shaft 40 is screwed into the female threaded portion 26 of the mirror shaft hole 24, and the rubber disk 38 is pressed against the head 36 of the pivot pin 32 by the lower end of the mirror shaft 40.

To give another example, as shown in FIG.
Head 36 of pivot pin 32 and mirror shaft 40
The coil spring 42 can be compressed by providing a slot or a recess at the lower end. In addition to this coil spring 42, a combination such as a counter spring, a combination of a counter spring and a steel ball on the counter spring, or a bearing washer on an elastic body can be employed. This reduces the rotational moment when the pivot pin is dragged by the operating force or reaction force of the operating lever and prevents the mirror shaft from rotating. Further, the mirror shaft hole and the lever pin hole do not necessarily have to be coaxial, and co-rotation can be prevented by making them slightly eccentric.

In addition, when a rubber disk is used as the elastic body, loosening and rattling of the mirror shaft can be prevented by threading the mirror shaft in the direction in which the mirror shaft is tightened by rotation of the pivot pin. In this case, the left and right mirror shafts have reverse threads.

In this way, the present invention employs a structure in which the mirror shaft hole and the lever pin hole are arranged vertically, and the pivot pin and the lower end of the mirror shaft come into contact with each other via an elastic body, which prevents the mirror shaft from bending like when a two-wheeled vehicle falls over. Even in this case, the force is blocked by the elastic body and does not have any adverse effect on the pivot pin.

Therefore, there is no fear that the function of the master cylinder will be impaired during or after an accident.

Even during normal operation, the lower end of the mirror shaft presses against the pivot pin via the elastic material, so there is no wobbling of the pivot pin. Moreover, even if the mirror shaft is slightly rotated to adjust the field of view of the mirror, there is no change in the rattling prevention ability, and the conventional problems can be solved with a simple structure.

When manufacturing and assembling the master cylinder, only one hole needs to be drilled, screw machining can be halved, the number of parts is reduced, and the pivot pin only needs to be dropped, so assembly is extremely easy. be effective.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially omitted plan view of a master cylinder, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a vertical cross-sectional view of a bracket showing another embodiment. . 10...Brake master cylinder, 12...Cylinder body, 14...Oil tank, 16...Handle pipe, 18...Handle holder part, 2
0... Upper bracket, 22... Lower bracket, 24... Mirror shaft hole, 26... Female threaded part, 2
8...Lever pin hole, 30...Small hole, 32...Pivot pin, 34...Rotation hole, 36...Head, 3
8...Rubber disc, 40...Mirror shaft, 42...Coil spring, 44...Operation lever, 46...
base.

Claims (1)

[Scope of utility model registration request] The rotating part of the operating lever is held between an upper bracket and a lower bracket, a mirror shaft hole is formed in the upper bracket to form a female screw part, and a mirror shaft hole is formed in the lower bracket below the mirror shaft hole. A lever pin hole with the same diameter or a smaller diameter is provided vertically, the pivot pin is inserted through the lever rotation hole and the lever pin hole to pivot the operating lever, and the pivot pin is inserted through the compressed elastic body. A rotating shaft for a two-wheeled vehicle operating lever, characterized in that the upper part is in contact with the lower end of a mirror shaft whose upper part is screwed into a mirror shaft hole.