JPS6210211Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a brake fluid pressure holding device for an automobile brake.

In automobiles, a hydraulic pressure holding valve is installed in the brake hydraulic pressure circuit between the master cylinder and the wheel cylinder in order to easily maintain the brakes on an uphill road and start the slope. (See Publication No. 55-43905).

For example, as shown in FIG. 3, this hydraulic pressure holding valve has a structure in which a ball 3 is loosely installed in a brake hydraulic pressure passage 2 of a main body 1, and when the ball 3 rolls toward the rear R side, the ball seat 4 and closes a passage communicating with the master cylinder side, and a lever 7 that rotates in conjunction with the on-operation of the clutch, and a camshaft 6 that rotates integrally with the lever 7 in the front-rear direction. A sliding push rod 5 is provided.

In the above, when the brake pedal is depressed on an uphill road, brake fluid pressure is supplied from the master cylinder to the wheel cylinder through the inlet port 8, passage 2, and outlet port 9, and a braking state is established.

When the brake pedal is depressed and the clutch pedal is depressed to release the clutch, the lever 7 and camshaft 6 rotate to the state shown by the solid line.
The push rod 5 is retracted to the rear of the ball seat 4 by a spring 5a.

Then, since the vehicle is tilted on the uphill road and the main body 1 is also tilted forward and upward, the ball 3 rolls toward the rear R side in the passage 2 and comes into contact with the ball seat 4, resulting in the state shown by the solid line.

In this state, even if you release your foot from the brake pedal, the braking fluid pressure in the wheel cylinder cannot return to the master cylinder side as long as the clutch pedal is depressed, and the braking state is maintained.

From this state, when the clutch pedal is returned while depressing the accelerator pedal, the clutch is turned on, the lever 7 and the camshaft 6 rotate, and the push rod 5 is pushed forward to the F side, protruding from the ball seat 4 and causing the ball to be pushed forward. 3 to the front F side as shown by the chain line, the brake fluid pressure on the wheel cylinder side is released, and it is possible to easily start on a slope.

With the above hydraulic pressure holding valve, when braking on an uphill road, the braking state will be maintained even if you take your foot off the brake pedal, but the clutch pedal must continue to be depressed, and there is a risk of accidental braking during the process. If you take your foot off the clutch pedal, the brakes will immediately be released and the vehicle will move backwards, which is extremely dangerous.

As shown in FIGS. 1 and 2, the present invention is provided with a hook member 12 on the main body 1 that engages with an engagement hole 7a provided in a lever 7 to maintain the retracted state of the push rod 5. An operating member 14 that is rotated in the direction of engagement with the mating hole 7a is provided on the inside of the vehicle such as the instrument panel 16, and the operating member 14 is operated as shown by the chain line while the clutch pedal is depressed. , hook member 12
is engaged with the engagement hole 7a, so that the braking state can be maintained even if the foot is released from the clutch pedal.

That is, when the clutch pedal is fully depressed and the clutch pedal is fully depressed, the engagement hole 7a is exactly opposite the hook portion 12a of the hook member 12, and in this state, when the operating member 14 is operated as shown by the chain line, the cable 1
5, the hook member 12 is rotated and the hook part 1
2a enters the engagement hole 7a. When you release your foot from the clutch pedal while maintaining this state, the cable 1 connecting the clutch side and the lever 7 becomes slack, and the lever 7 is rotated clockwise in Fig. 1 by the return spring 11, but only slightly. When the lever 7 is rotated, the hook portion 12a engages with the edge of the engagement hole 7a to restrict further rotation of the lever 7.

The engagement between the edge of the engagement hole 7a and the hook portion 12a is reliably maintained by the spring force of the return spring 11 of the lever 7.

When starting, first fully depress the clutch pedal. Then, the lever 7 is slightly rotated counterclockwise in FIG. 1, the hook portion 12a is removed from the edge of the engagement hole 7a, and the spring 13 causes the hook member 12 and the operating member 14 to return to the state shown by the solid line. .

After that, press the accelerator pedal and take your foot off the clutch pedal as usual.
While the brake is released, the clutch is turned on and the vehicle can start moving.

As described above, in this invention, when the hydraulic pressure holding valve is in the hydraulic pressure holding state, by operating the operating member in the vehicle interior, the hook member engages with the lever, and the braking state is maintained even if the foot is released from the clutch pedal. By depressing the clutch pedal once when starting, the hook member is automatically disengaged from the lever, so that the brake pedal and clutch pedal can be easily used when braking and stopping on an uphill road. It is possible to accurately maintain the braking state even when the foot is removed from both sides, reducing driver fatigue and improving safety, which can have a great practical effect. It is.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a sectional view taken along the line -- in FIG. 1...Main body, 2...Hydraulic pressure passage, 3...Ball,
4... Ball seat, 5... Push rod, 6
...Camshaft, 7...Lever, 7a...Engagement hole, 12...Hook member, 13...Spring,
14...Operation member.

Claims (1)

[Scope of utility model registration request] A ball is installed loosely in the brake hydraulic pressure passage formed inside the main body, and when braking on an uphill road, the ball rolls backwards, closing the hydraulic pressure passage on the master cylinder side and maintaining the brake hydraulic pressure in the wheel cylinder. In the brake fluid pressure holding valve, the brake fluid pressure holding valve is configured to do so, and is provided with a push rod that projects forward by a lever that rotates in conjunction with the on operation of the clutch, and presses and moves a ball forward to release the brake fluid pressure in the wheel cylinder. The main body is provided with a hook member that engages the lever in the hydraulic pressure holding state by operating from the vehicle interior and restrains the lever from rotating in the direction of releasing the hydraulic pressure, and the hook member is automatically engaged when the clutch pedal is depressed. A brake fluid pressure holding device for an automobile brake, characterized by having a structure that allows the engagement with a lever to be released automatically.