JPS632354Y2 - - Google Patents

Description

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

In automobiles, in order to make it easier to maintain the brake on an uphill road and start on a slope, the slope of the uphill road is used to depress the brake pedal on the uphill road, and when braking with the clutch released, the brake pedal is depressed once. The brake fluid pressure holding valve is designed to maintain the braking state even when the foot is released from the brake pedal, and release the above-mentioned brake holding state when the clutch is turned on when starting the vehicle. A system installed in the middle of pressure piping has already been developed and is commonly used (see, for example, Japanese Utility Model Application Publication 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 RWC 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.

In the brake fluid pressure holding device as described above, the interlocking mechanism between the camshaft 6 and the clutch usually has a structure in which a lever portion 62 integrated with the camshaft 6 and a clutch pedal or a member operated by the clutch pedal are connected by a cable. Conventionally, the operating force was transmitted to the camshaft by a 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 braking holding fluid pressure, thereby preventing the clutch from moving. 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, which can cause 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 eliminate the above-mentioned drawbacks of the conventional art, and will be described below with reference to the embodiment shown in FIG.

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

In the present invention, a lever portion 62 provided on the camshaft 6 of the clutch actuation mechanism and the brake fluid pressure holding valve is used.
Both ends of the valve operation cable 14 connecting the clutch 10 are engaged with the clutch release fork 11 and the lever portion 62 so that the restoring force of the clutch diaphragm spring 12 is transmitted to the camshaft 6 when the clutch 10 is turned on. It is characterized by:

That is, in FIG. 1, the valve operating cable 14 has one end connected to the lever portion 62 of the camshaft 6.
The other end is connected to the clutch release fork 11, and when the clutch 10 is turned off, no force can be transmitted to the camshaft 6 side. Turn the camshaft 6 in the loading direction.
A spring 15 is provided which urges the shaft to rotate. The force required to actuate the push rod 5 in the direction of retraction is much smaller than the force required to actuate the push rod 5 in the direction of pushing and moving the ball 3 on which the brake holding fluid pressure is acting. Therefore, the spring force of the spring 15 is very small and can sufficiently perform the predetermined function.

In the above configuration, when the clutch pedal 8 is depressed to turn off the clutch 10, the camshaft 6 is rotated as the clutch release fork 11 rotates.
is rotated counterclockwise in FIG. 1 by the spring force of the spring 15, and the push rod 5 is retracted as shown by the solid line in FIG. In this case, no load from the brake fluid pressure holding valve side acts on the clutch pedal 8, and only the spring reaction force of the clutch diaphragm spring 12 acts on the clutch pedal 8, so the clutch pedal depression force is controlled by the brake fluid pressure holding device. This is the same as in the case of a car without the clutch pedal, and the conventional problem that the pressing force of the clutch pedal 8 becomes heavy 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 lever portion via the clutch release fork 11 and the valve operation cable 14. 62, and the camshaft 6
is rotated clockwise in FIG. 1, the push rod 5 moves forward, and a little before the clutch 10 is turned on, the ball 3 is pushed away from the ball seat 4 to release the holding fluid pressure, and when the clutch 10 is in the on state, the ball is turned on. 3 to the position indicated by the chain line in FIG.

In this case clutch diaphragm spring 12
The elastic restoring force of the clutch diaphragm spring 12 is originally much stronger than the force required to release the retained fluid pressure, and the spring force of the spring 15 acting as resistance is extremely small as described above. On the way, the push rod 5 can be sufficiently moved forward to push the ball 3 forward against the braking holding fluid pressure.

Once the ball 3 is pushed forward and the braking fluid pressure is released, the spring force of the clutch diaphragm spring 12 is For the most part, it serves to keep the clutch 10 in the on state, and has no adverse effect on clutch function.

The above embodiment shows an example in which the spring 15 provides an operating force in the direction of retracting the push rod 5, but the spring 15 is eliminated and the clutch release fork 1 is used instead.
1 and the lever part 62 of the camshaft 6 are connected by a cable 14' as shown by the dotted line, and the clutch 10
When the switch is turned off, the cable 14' may be used to rotate the camshaft 6 counterclockwise in FIG. 1, thereby causing the push rod 5 to move backward.

When the cable 14' is provided and the spring 15 is omitted, the push rod 5 is moved backward by the force of pressing the clutch pedal 8, but as described above, the force required to move the push rod 5 backward is The operation of the push rod in the protruding direction, which is extremely small and requires a large force, is performed by the spring force of the clutch diaphragm spring 12 via the valve operation cable 14 as in the previous embodiment, so that the depression force of the clutch pedal 8 is lower than that of the conventional device. It is significantly lighter than the previous model, and can fully achieve the desired effect.

As described above, according to the present invention, in automobiles equipped with a brake fluid pressure holding valve, the conventional problem of heavy clutch pedal depression force can be completely solved with an extremely simple configuration. , the ability 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 sectional view showing a structural example of the hydraulic pressure holding valve shown in Fig. 1, and Fig. 3 shows the relationship between the push rod and camshaft shown in Fig. 2. FIG. 1... Body, 2... Brake hydraulic pressure passage, 3... Ball, 4... Ball seat, 5... Push rod, 6... Camshaft, 7... Brake pedal, 8... Clutch pedal, 9... Clutch. Cable, 10...Clutch, 11...Release fork, 12...Diaphragm spring, 14...
...Valve operation cable, 15...Spring.

Claims (1)

[Claims for Utility Model Registration] (1) A ball is freely installed in the brake hydraulic pressure passage of the main body having a brake hydraulic pressure passage therein so as to be able to roll in the front and back direction, and the clutch is activated when braking on an uphill road. When the push rod is turned off, the push rod moves backwards and the ball rolls backwards on the slope of the road and hits the ball seat to maintain braking fluid pressure.When the clutch is turned on when starting the vehicle, the camshaft that is linked to the clutch operation rotates. In this brake fluid pressure holding valve, the push rod is moved forward, and the ball that has been in contact with the ball seat is pushed forward by the push rod, thereby releasing the brake holding fluid pressure. One end of the cable is connected to the camshaft, and the other end of the cable is connected to the clutch release fork, so that when the clutch is turned on, the camshaft rotates in a direction that moves the push rod forward by the spring force of the clutch diaphragm spring. A brake fluid pressure holding device for an automobile, characterized in that it has an engaged configuration. (2) Utility model registration claim 1, which is characterized in that the backward movement of the push rod when the clutch is turned off is performed by the spring force of a spring provided between the camshaft and the main body.
The brake fluid pressure holding device for automobiles described in 2. (3) Utility model registration claim 1, which is characterized in that the rearward movement of the push rod when the clutch is turned off is carried out by another cable whose both ends are connected to the clutch release fork and the camshaft, respectively. The brake fluid pressure holding device for automobiles described in 2.