JPS632355Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a brake fluid pressure holding device for automobiles.

BACKGROUND TECHNOLOGY In order to make it easier for automobiles to maintain the brakes on an uphill road and start on a slope, the slope of the uphill road is used to make it easier to brake by depressing the brake pedal and disengaging the clutch on the uphill road. A brake fluid pressure holding valve is installed from the master cylinder to the wheel cylinder, which maintains the braking state even if the brake pedal is depressed and releases the braking state when the clutch is turned on when the clutch is turned on. A system installed in the middle of the braking hydraulic pressure piping has already been developed and is in general use (see, for example, Japanese Utility Model Application No. 55-21250).

As shown in FIGS. 2 and 3, the brake fluid pressure holding valve usually includes a cylindrical main body 1 having a brake fluid pressure passage 2 therein, and a cylinder that can roll in the front and rear directions within the brake fluid pressure passage 2. The main body 1 is configured such that the balls 3 and the ball seat 4 provided at the rear end of the brake hydraulic pressure passage 2 can be moved in and out of the opening 41 of the ball seat 4.
The push rod 5 is slidably fitted into the
and a camshaft 6 which rotates in conjunction with the on/off operation of the clutch and controls the slide of the push rod 5. When braking on a slope, when the brake pedal 7 is depressed on an uphill road and the clutch is turned off, the brake fluid is Pressure is supplied from the master cylinder Mc to the front and rear wheel cylinders FWC and HWC through the inlet portion 1a, the opening 41 of the ball seat 4, the brake fluid pressure passage 2, and the outlet portions 1b and 1b'. As the push rod 5 is turned off, the push rod 5 moves backward as shown by the solid line, and the ball 3 rolls backward due to the slope of the uphill road and comes into contact with the ball seat 4, closing the opening 41, and in this state, the brake is applied. Even if the foot is released from the pedal 7, as long as the clutch pedal is depressed and the clutch is turned off, the brake fluid pressure supplied to the wheel cylinders is not released and the brake state can be maintained.

When the clutch is turned on while depressing the accelerator pedal when starting, the camshaft 6 rotates as the clutch is turned on, and the cam portion 61 is displaced forward as shown by the chain line, causing the push rod 5 to move forward. The tip of the push rod 5 protrudes forward from the opening 41 of the ball seat 4 to press and move the ball 3 forward, and
is opened, and the braking fluid pressure in the wheel cylinder is released, making it easier to start on a slope.

Problems to be Solved by the Invention In the brake fluid pressure holding device as described above, the interlocking mechanism between the camshaft 6 and the clutch usually consists of a lever portion 62 integrated with the camshaft 6, a clutch pedal, or a member operated by the clutch pedal. Conventionally, the operating force was transmitted to the camshaft by the cable only in the direction in which the clutch pedal was depressed.
When the clutch pedal is returned to the clutch-on direction, the camshaft 6 is generally configured to rotate in a direction to slide the push rod 5 forward by a return spring provided on the lever portion 62.

Therefore, the return spring provided on the lever portion 62 of the camshaft 6 must have a spring force that is strong enough to cause the ball 3 to protrude forward against the brake holding fluid pressure. When the pedal is depressed, the spring force of the return spring acts as resistance, which increases the force required to press the clutch pedal, resulting in driver fatigue when the clutch pedal has to be depressed many times in a short period of time, such as when waiting at a traffic light. The disadvantage is that it becomes larger.

The present invention aims to overcome the above-mentioned conventional drawbacks.

Means to Solve the Problems The present invention is characterized in that in the above-mentioned brake fluid pressure retention valve, the interlocking mechanism between the clutch and the camshaft of the brake fluid pressure retention valve is composed of a push-pull cable which has one end connected to the camshaft and the other end connected to the clutch release fork, and when the clutch is engaged, the spring force of the clutch diaphragm spring rotates the camshaft in the direction that causes the push rod to protrude forward.

Function In the above, when braking on an uphill road, when the clutch pedal is depressed and the clutch release fork turns off the clutch, the operation of the clutch release fork is transmitted to the camshaft via the push-pull cable, and the camshaft is The push rod rotates in one direction, the push rod retreats, the ball closes the opening of the ball seat, and the brake fluid pressure is maintained. When the clutch pedal is released from this state, the clutch is turned on by the elastic restoring force of the clutch diaphragm spring 12, and the elastic restoring force of the clutch diaphragm spring is applied via the clutch release fork and push-pull cable. This is transmitted to the camshaft, which rotates in the opposite direction to the above, causing the push rod to protrude forward, press the ball forward, and release the braking hydraulic pressure.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, 8 is a clutch pedal, and 9 is a clutch cable. One end of the clutch cable 9 is connected to the clutch pedal 8, and the other end is connected to a release fork 11 of a clutch 10. When the clutch pedal 8 is depressed, the clutch is activated. The clutch release fork 11 rotates clockwise in the figure via the cable 9, and the clutch diaphragm spring 12 bends to become the clutch-off state. When the clutch pedal 8 is released, the restoring force of the clutch diaphragm spring 12 releases the clutch 10. is in the on state. 13 is a return spring for the clutch release fork 11.

The clutch actuation mechanism described above has been widely used and is well known.

In FIG. 1, A is a brake fluid pressure retention valve, and the brake fluid pressure retention valve A has the same structure as the conventionally known brake fluid pressure retention valve shown in FIGS. 2 and 3, for example. In the brake fluid pressure holding valve A of FIG. 1, the same reference numerals as in FIG. 2 represent the same parts.

In the present invention, a push-pull cable 1 is used as a valve operating cable that connects the clutch operating mechanism and the camshaft 6 of the brake fluid pressure holding valve A.
4, one end of the push-pull cable is fixed to the clutch release fork 11, and the other end is fixed to the lever part 62 provided on the camshaft 6, and the camshaft 6, which was conventionally provided between the lever part 62 and the main body 1, is fixed. This is characterized by the elimination of the return spring. In the above configuration, when the clutch pedal 8 is depressed, the clutch 1
If 0 is off, clutch release fork 1
1, the push-pull cable 14 operates in the push direction, the camshaft 6 rotates counterclockwise in FIG. 1, and the push rod 5 retreats as shown by the solid line in FIG. In this case, as mentioned above, since there is no return spring for the camshaft 6, the load from the brake fluid pressure holding valve side applied to the clutch pedal 8 is extremely small, and the clutch pedal 8 is mainly affected by the spring reaction force of the clutch diaphragm spring 12. Therefore, the clutch pedal depression force is almost the same as in a car not equipped with a brake fluid pressure holding device, and the conventional problem of heavy depression force on the clutch pedal 8 is completely eliminated.

When you release your foot from the clutch pedal 8, the clutch 10 is turned on by the elastic restoring force of the clutch diaphragm spring 12, and the elastic restoring force of the clutch diaphragm spring 12 is applied to the clutch release fork 11 and the push-pull cable 14.
The camshaft 6 rotates clockwise in FIG. 1, pushing the ball 3 away from the ball seat 4 just before the push rod 5 moves forward and the clutch 10 is turned on. The holding fluid pressure is released and the ball 3 is moved to the position shown by the chain line in FIG. 2 with the clutch 10 in the on state.

In this case clutch diaphragm spring 12
The elastic restoring force of is originally much stronger than the force required to release the holding fluid pressure, and it easily moves the push rod 5 forward in the middle of the spring stroke of the clutch diaphragm spring 12, resisting the braking holding fluid pressure. The ball 3 can be pushed forward.

Once the ball 3 is pushed forward and the braking fluid pressure is released, the spring force of the clutch diaphragm spring 12 is reduced because it does not require much force to maintain the forward protruding position of the push rod 5. For the most part, it serves to keep the clutch 10 in the on state, and has no adverse effect on clutch function.

Effects of the invention As described above, according to the invention, it is possible to completely eliminate the conventional problem of heavy clutch pedal depression force in automobiles equipped with a brake fluid pressure holding valve with an extremely simple configuration. It is possible to reduce driver fatigue,
This can bring about great practical effects.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the present invention, Fig. 2 is a cross-sectional view showing an example of the structure of the hydraulic pressure retention valve of Fig. 1, and Fig. 3 is a cross-sectional plan view showing the relationship between the pushrod and camshaft of Fig. 2. 1...Main body, 2...Brake hydraulic pressure passage, 3...Ball, 4...Ball seat, 5...Pushrod, 6...Camshaft, 7...Brake pedal, 8...Clutch pedal, 9...Clutch cable, 10...Clutch, 11...Release fork, 12...Diaphragm spring, 14...
...Push-pull cable.

Claims (1)

[Scope of utility model registration request] A ball is loosely installed in the brake hydraulic pressure passage of the main body, which has a brake hydraulic pressure passage inside, so that it can roll in the front and back direction, and when the brake is turned off when braking on a climbing road, the push rod moves rearward and prevents the slope of the road surface. The ball rolls backwards and hits the ball seat to maintain the braking fluid pressure, and when the clutch is turned on when starting the vehicle, the camshaft that is linked to the clutch operation rotates and moves the push rod forward. In a brake fluid pressure holding valve that presses and moves the ball that was in contact with the ball seat forward to release the brake holding fluid pressure,
The interlocking mechanism between the clutch and the camshaft is composed of a push-pull cable whose one end is connected to the camshaft and the other end is connected to the clutch release fork. The camshaft rotates in one direction and the push rod moves backward, and when the clutch is activated, the spring force of the clutch diaphragm spring causes the camshaft to rotate in the opposite direction to the above through the clutch release fork and push rod, and the push rod moves forward. A brake fluid pressure holding device for an automobile, characterized in that it is designed to move in a protruding manner.