JPS6328700Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a master cylinder operating device for operating a brake, clutch, etc. using hydraulic pressure in a motorcycle or the like.

This type of master cylinder operating device pushes a piston, which is fitted into a cylinder body and is urged in the return direction by a return spring, with the pressing part of an operating lever rotatably supported by the cylinder body. It operates by supplying pressurized fluid to the brake or clutch. In order to adjust the operating stroke of the operating lever, there is a device in which an adjusting bolt is screwed onto the pressing portion of the operating lever, and the piston is pushed through the adjusting bolt.

However, in such a device, the adjustment bolt is screwed into the pressing portion of the operating lever, and its tip also moves and pushes the piston as the operating lever rotates. Therefore, wear and deformation occur at the contact portion of the piston with the adjustment bolt. Also, the structure of the adjustment bolt to stop it from turning is complicated,
It is necessary to use a special tool to rotate it for adjustment.

This idea was developed against the background of this situation, and aims to reduce the wear and deformation that occurs on the piston due to the pressing operation, and also makes it possible to easily adjust the operating stroke of the operating lever without using special tools. The object of the present invention is to provide a master cylinder operating device with a simple structure.

In order to achieve the above object, this invention has a nut body having a support shaft part at both ends in the axial direction and a female thread part in a direction perpendicular to the axial direction, which is rotatably inserted into the pressing part of the operating lever, and the piston abuts. A bolt body having a part and a gear part is screwed into the female thread part of this nut body,
Further, the support shaft portion of the nut body is rotatably supported by a presser body attached to the pressing portion, and the claw portion thereof is engaged with and held by the gear portion of the bolt body, and the operating lever is further held by an elastic member. It is characterized in that it is biased in the operating direction with a force weaker than the return spring.

Hereinafter, one embodiment of this invention will be described in detail based on the accompanying drawings.

A master cylinder 1 for operating brakes, clutches, etc. of wheels of a motorcycle is attached to a handle 2, and a piston 4 is slidably inserted into a cylinder body 3 of the master cylinder 1. This piston 4 is urged in the return direction by a return spring 5, and is placed in a fixed retracted position by a stopper 6.

On the other hand, an operating lever 7 is rotatably attached to the open end side of the piston 4 of the cylinder body 3 by a support bolt 8. One end 9 of this operating lever 7 comes into contact with the side wall 3a of the cylinder body 3,
The position of the operating lever 7 in the non-operating direction is restricted. A spring 1, which is an elastic member, is provided between the side wall 3a of the cylinder body 3 and one end 9 of the operating lever 7.
0 is contracted and always biases the operating lever 7 in the operating direction. This spring 10 is set to have a weaker load than the return spring 5 of the piston 4.

A pushing part 11 formed on the side opposite to the one end 9 of the operating lever 7 has an insertion hole 13 for a nut body 12 in a direction perpendicular to the operating direction, and a bolt is inserted into this pushing part 11 from the piston 4 side. A guide hole 15 of the body 14 is formed toward the insertion hole 13.
The guide hole 15 is formed to have a large diameter or an elliptical shape so as not to impede movement of the bolt body 14 in the operating direction of the operating lever 7.

The nut body 12 has support shaft portions 12a, 12a at both ends in the axial direction, and a female threaded portion 12b in a direction orthogonal to the axial direction, and the through hole 1
3 is rotatably provided. The bolt body 1
4 has a gear part 14a in the center, a male screw part 14b in one end, and a piston contact part 14c in the other end.
The male threaded portion 14b is screwed into the female threaded portion 12b of the nut body 12. The piston contact portion 14c is inserted into the insertion hole 4a formed in the head of the piston 4, and the piston 4 is pushed by operating the operating lever 7. The screw movement of the bolt body 14 adjusts the gap existing between the piston contact portion 14c and the insertion hole 4a.

The nut body 12 and the bolt body 14 are connected to the presser body 1
6 is supported. That is, this presser body 16
is formed from an elastic material and has a U-shaped cross section.
A locking portion 1 extending from one end of the holding portion 16a
6b. And the holding part 16a
is attached to the pressing part 11 of the operating lever 7, and the hole 1
6c, 16c, the support shaft portion 12a of the nut body 12,
12a is rotatably held, and the claw portion 16d of the locking portion 16b is engaged with the gear portion 14a of the bolt body 14. This presser body 16 is a nut body 12.
is held in the pressing portion 11 so as to be rotatable independently of the operating lever 7, and the presser body 16 itself is also rotatable relative to the operating lever 7. Locking pieces 16e, 16e are formed on the opening side of the holding portion 16a, respectively, and are held on the sides of the pressing portion 11.

A regulating piece 16f is formed at the tip of the locking portion 16b to restrict the screwing stroke of the bolt body 14, and the locking piece 16e restricts the screwing stroke of the bolt body 14.

Next, the operation of this embodiment will be explained. When inactive while driving, the operating lever 7 is operated by the spring 10.
Since the piston contact portion 14c of the bolt body 14 is in contact with the insertion hole 4a of the piston 4, play is prevented from occurring between the two.

When the operating lever 7 is pulled in the direction of the handle 2, the piston 4 is pushed through the nut body 12 and bolt body 14 of the pressing portion 11. At this time, since the nut body 12 is rotatably held by the presser body 16 on the pressing part 11, the pressing fulcrum of the piston contact part 14c of the bolt body 14 hardly slides, and the insertion hole 4a of the piston 4 is prevented from sliding. Wear and deformation of the abutting surface is reduced. Since the presser body 16 is provided to allow rotation of the operating lever 7, the engagement position of the claw portion 16d with the gear portion 14a of the bolt body 14 does not change due to rotation of the operating lever 7.

The operating stroke of the operating lever 7 can be adjusted by manually rotating the gear portion 14a of the bolt body 14.The presser body 16 is made of an elastic material, and the claw portion 16d
The floating gear portion 14a is allowed to rotate, and the bolt body 14 can be easily screwed in or out, and the adjustment operation is simple.

As mentioned above, according to this invention, since the operating lever is always urged in the operating direction by the elastic member,
Backlash is prevented. The operating stroke of the operating lever can be adjusted simply by manually rotating the gear part of the bolt body.The presser body allows the gear part to rotate, and the bolt body can be easily screwed in or out, making adjustment easy. . In addition, the nut body and the presser body that holds it are rotatably provided on the pressing part of the operating lever, so that
Wear and deformation of the pressing fulcrum of the piston are prevented.
Further, the nut body and the bolt body are reliably held on the pressing portion of the operating lever by the presser body with a simple structure, and since the nut body also functions as a pivot pin, the number of parts is reduced and ease of assembly is improved.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view showing an embodiment of this invention, FIG. 2 is a cross-sectional view taken from FIG. 1, and FIG. 3 is a perspective view of the presser body. 3 is a cylinder body, 4 is a piston, 7 is an operating lever, 10 is a spring, 11 is a pressing part, 12
1 is a nut body, 14 is a bolt body, and 16 is a presser body.

Claims (1)

[Scope of utility model registration request] In a master cylinder operating device, a piston fitted into a cylinder body and urged in the return direction by a return spring is pushed by a pressing portion of an operating lever rotatably supported by the cylinder body. A nut body having support shaft parts at both ends and a female thread part in a direction perpendicular to the axial direction is rotatably inserted into the pressing part, and a bolt body having a piston contact part and a gear part is inserted into the female thread part of the nut body. The support shaft portion of the nut body is rotatably supported by a presser body screwed into the body and attached to the pressing portion, and the claw portion thereof is engaged with and held by the gear portion of the bolt body. A master cylinder operating device in which a lever is biased in the operating direction by an elastic member with a force weaker than the return spring.