JPH042158Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a hydraulic master cylinder that operates vehicle brakes using hydraulic pressure, and in particular to a brake switch that lights up a stop lamp in conjunction with the generation of hydraulic pressure. The present invention relates to a vehicle hydraulic master cylinder equipped with a vehicle hydraulic master cylinder.

[Conventional technology]

In some conventional motorcycles, a brake switch for a stop lamp that lights up when the brake pedal is depressed is provided in a hydraulic master cylinder interposed between the brake pedal and the rear brake.

Among these, for example, the technique disclosed in Japanese Utility Model Application Publication No. 62-105091 has a large-diameter hole on the opening side of the cylinder hole into which the piston is inserted, and a circlip fitted into the large-diameter hole prevents the piston from coming out. The top head of the push rod that pushes the piston is locked to the two stop springs to restrict the retraction limit of the push rod when it is not in operation, and a leaf spring is interposed between the two stop springs to As it moves forward, the inner stop ring is urged toward the bottom of the cylinder hole, and the fixed contact of the brake switch is placed at the bottom of the large diameter hole, and the movable contact that contacts the fixed contact is placed on the side of the bottom of the cylinder hole of the inner stop ring. The technologies provided for each are disclosed.

[The problem that the idea attempts to solve]

However, when installing a new brake switch as described above, it is troublesome to align both contacts, and the installation requires many man-hours and is complicated. In addition, when replacing the brake switch, the circlip and both stop rings must be removed and the push rod removed. The work requires a great deal of time and effort because it cannot be done unless it is pulled back once.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic master cylinder for a vehicle equipped with a brake switch, which allows the brake switch to be easily installed and replaced.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention locks the tip head of a push rod that pushes a piston inserted into the cylinder hole to a stop ring that is fixed to the opening side of the cylinder hole formed in the cylinder body. A hydraulic master cylinder for a vehicle is provided with a brake switch in the cylinder body that controls the backward limit of the push rod when the push rod is not in operation, and lights up a stop lamp in conjunction with the forward movement of the push rod. At the same time, a brake switch is provided movably toward the bottom side of the cylinder hole, and a brake switch is fixedly installed on the inner periphery of the cylinder hole on the opening side of the stop ring.
The brake switch is characterized in that it is provided with an actuator that is pressed against a stop ring when the push rod is in the non-operating position, and that is released from the pressure and projects when the push rod is activated.

[Operation] According to the above configuration, the brake switch is provided closer to the opening than the stop ring, so new installation or replacement can be easily performed in a short time.

〔Example〕

An embodiment in which the present invention is applied to a vertical hydraulic master cylinder used in a rear brake of a motorcycle will be described below with reference to the drawings.

The hydraulic master cylinder 1 has a cylinder hole 2 inside.
On the upper side of the vertical cylinder body 3,
It has a reservoir type with a protruding reservoir 6 that communicates with the cylinder hole 2 via the relief port 4 and the supply port 5, and a piston 7 for generating hydraulic pressure is inserted into the cylinder hole 2 in a liquid-tight and movable manner. ,
A hydraulic chamber 8 is defined between the upper bottom of the cylinder hole 2 and the piston 7.

The cylinder hole 2 has a large diameter hole 2a at its lower opening side, and a through hole 1 for the stop ring 10 which is prevented from coming out by a circlip 9 fitted into the large diameter hole 2a.
The shaft 11a of the push rod 11, which is pivotally supported by a brake pedal (not shown), is inserted into the shaft 0a, and the head 11b at the tip is urged toward the large diameter hole 2a by the return spring 12 contracted in the hydraulic chamber 8. It is placed in contact with the rear end of the piston ring 7,
Piston 7 and push rod 11 when not in operation
As shown in FIG. 1, the head 11b of the push rod 11 pushed by the piston 7 engages with the stop ring 10, and its retraction limit is restricted.

Large diameter hole 2a on the opening side of the stop ring 10
A brake switch 14 for the rear brake, which is screwed with a screw 13, is provided adjacent to the circlip 9, and between the lower outer periphery of the cylinder body 3 and the shaft portion 11a of the push rod 11,
A boot 15 is attached to protect the cylinder hole 2 from dust.

The brake switch 14 is connected by a lead wire 16 to operate a rear brake that brakes the rear wheels with pressure fluid supplied from a hydraulic chamber 8 in conjunction with a push rod 11 that moves upward when the brake pedal is depressed. The stop lamp at the rear of the vehicle body lights up to display the stop lamp.
An actuator 14b that comes into contact with the opening side surface 10b of 0 is provided in a protruding manner.

In the non-operating position of the push rod 11 shown in FIG.
When the push rod 11 is pressed against the opening side surface 10b of the switch case 10b and the pressure is released, the push rod 11 is provided so as to be able to protrude upward, and a coil spring 17 is provided on the upper surface of the switch case 14a from which the actuator 14b protrudes. ing.

This coil spring 17 is an elastic member that pushes up the stop ring 10 which is disengaged from the head 11b of the push rod 11 that moves upward during operation, and its set load is caused by the elastic force of the return spring 12 of the hydraulic chamber 8. It is set smaller than the force.

With the above configuration, in the non-operating state shown in FIG. 1, the coil spring 17 is compressed by the stop ring 10 that engages with the head 11a of the push rod 11 and is prevented from coming out by the circlip 9, and the stop ring 17 is compressed. The brake switch 14 is activated by the actuator 14b which is pushed back by the pressure of 10.
It becomes OFF. Also, when operating, the push rod 1
When the stop ring 1 moves upward against the elastic force of the return spring 12, the stop ring 10, which is disengaged from the push rod 11, moves against the coil spring 17.
The actuator 14b projects upward, turning on the brake switch 14 and lighting the stop lamp.

As described above, in this embodiment, the brake switch 14 that lights up the stop lamp is provided in the large diameter hole 2a on the opening side of the stop ring 10, so not only when the brake switch 14 is newly installed, but also when replacing it. This can be easily done in a short time by simply attaching and detaching the boots 15 and screws 13.

Furthermore, in order to turn the brake switch 14 ON and OFF, it is only necessary to provide a coil spring 17 in the switch case 14a and push the stop ring 10 up as the push rod 11 moves upward. The components of the hydraulic master cylinder 1 associated with the brake switch 14 may remain in their conventional shapes and do not require any special processing.

Incidentally, the coil spring for pushing up the stop ring may be attached to the stop ring side, or may be formed of a leaf spring.

Furthermore, a resilient member is provided within the switch case to cause the actuator to protrude, but if the resilient force of this resilient member is sufficient to push up the stop ring, the above-mentioned spring may be omitted. In this case, an off-the-shelf brake switch can be used as it is, and the price can be further reduced.

[Effect of idea]

As explained above, the present invention provides a stop ring that regulates the retraction limit of the push rod so as to be movable toward the bottom side of the cylinder hole as the push rod moves forward, and a brake switch is installed on the inner periphery of the cylinder hole on the opening side of the stop ring. Since the brake switch is provided with an actuator that is pressed by a stop spring when the push rod is in the non-operating position, and that releases the pressure and protrudes when the push rod is activated, the brake switch can be Also, the replacement work can be done easily and in a short time, and in particular, the replacement work, which conventionally required disassembly, can be greatly improved and the cost can be reduced.

Furthermore, the components of the hydraulic master cylinder related to the brake switch can be used as they are without any special changes, and the brake switch can be an off-the-shelf product, making it possible to further reduce the price.

[Brief explanation of drawings]

The figures show an embodiment in which the present invention is applied to a hydraulic master cylinder used in the rear brake of a motorcycle. The sectional view and FIG. 3 are perspective views of the brake switch. DESCRIPTION OF SYMBOLS 1... Hydraulic pressure master cylinder, 2... Cylinder hole, 2a... Large diameter hole of cylinder hole 2, 3... Cylinder body, 7... Piston, 8... Hydraulic pressure chamber, 9
... Circlip, 10 ... Stop spring, 1
0a...Through hole, 10b...Opening side of stop ring 10, 11...Push rod, 11a...
Shaft portion, 11b...head, 12...return spring, 13...screw, 14...brake switch,
14a... switch case, 14b... actuator,
16...Lead wire, 17...Stop spring 10
Coil spring that moves up.

Claims (1)

[Scope of utility model registration request] The end head of the push rod that pushes the piston inserted into the cylinder hole is locked to a stop ring that is secured to the opening side of the cylinder hole formed in the cylinder body, thereby regulating the retraction limit of the push rod when not in operation. In the hydraulic master cylinder for a vehicle, the cylinder body is provided with a brake switch that lights up a stop lamp in conjunction with the advancement of the push rod, and the stop ring is provided so as to be movable toward the bottom side of the cylinder hole as the push rod moves forward. A brake switch is fixedly installed on the inner periphery of the cylinder hole on the opening side of the stop ring, and the brake switch has an operation in which the brake switch is pressed against the stop ring when the push rod is in an inoperative position, and is released from the pressure when the push rod is in operation and projects. A hydraulic master cylinder for a vehicle with a brake switch, which is characterized by having a brake switch.