JPH034608Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable brake system used, for example, in an anti-lock brake system for automobiles.

For example, an anti-lock brake system for an automobile automatically prevents tires from locking by variably controlling the brake operation based on wheel rotation, etc. A brake device used for this purpose is constructed as follows.

In other words, the hydraulic fluid driven by the brake pedal is sent under pressure to a variable hydraulic pressure intensifier called a modulator, and the hydraulic fluid whose pressure has been increased by this pressure intensifier is sent under pressure to the hydraulic control mechanism, while the control fluid pressurization source and The control fluid reservoirs are communicated with the control fluid pressure chambers of the modulators through respective control valves, and the fluid pressure in the control fluid pressure chambers is controlled by complementary opening and closing operations of the control valves, thereby increasing the number of modulators. It is configured to variably control the pressure force, thereby variably controlling the brake operation. The control valves are controlled to open and close in a complementary manner based on, for example, the rotational speed of the wheels. In other words, the valve on the control fluid pressure source side opens, and the valve on the storage tank side closes, increasing the pressure in the control fluid pressure chamber, thereby weakening the brake strength, and as the valve on the storage tank side opens, The valve on the pressurization source side closes and the pressure in the control hydraulic pressure chamber decreases, causing the brakes to be applied more strongly. Because of this configuration, the pressure within the control hydraulic pressure chamber described above constantly changes, and the pressure when pressurized is extremely high (approximately 200 to 230 Kg/cm ² ). Therefore, when the control valve on the storage tank side is opened, a violent blowback occurs at that moment, and the control liquid is blown against the inner surface of the cap of the storage tank. For this reason, the control liquid always adheres to the rubber packing on the inner surface of the cap, resulting in the inconvenience of shortening the life of the cap. Furthermore, some kind of pressure is always built up in the control hydraulic pressure chamber, and for this reason, the moment the cap of the storage tank is opened for inspection or the like, the control liquid may gush out forcefully and scatter.

This invention was devised in view of the above-mentioned conventional problems, and its purpose is to prevent the aforementioned control liquid from blowing onto the cap of the control liquid storage tank and once adhering to the cap. To provide a variable operation type brake device which can easily prevent the cap from flying out when the cap is opened.

Hereinafter, embodiments of this invention will be described based on the drawings.

The figure shows an embodiment of the variable operation brake device according to this invention.

The device shown in the figure first includes a brake pedal 40.
From a master cylinder 10 driven by
The hydraulic fluid in the hydraulic fluid tank 42 is
It is fed into the next cylinders 14a and 14b. Thereby, the primary pistons 16a and 16b of the respective primary cylinders 14a and 14b are driven in directions facing each other.
Further, the piston shafts of the respective primary pistons 16a, 16b drive the secondary pistons 20a, 20b of the secondary cylinders 18a, 18b, respectively, and the respective secondary pistons 20a, 20b drive the secondary pistons 20a, 20b of the secondary cylinders 18a, 18b, respectively.
The hydraulic fluid in a and 18b is transferred to the hydraulic braking mechanism section 22.
The hydraulic fluid is pressure-fed to a and 22b as pressurized hydraulic fluid.
On the other hand, a control valve 3 opens and closes a control hydraulic chamber 24, which is a cylinder whose both ends are closed by the pair of primary pistons 16a and 16b, in a mutually complementary manner.
6a, 36b to a controlled pressurization source 26 and a control liquid storage tank 28. As above,
A modulator 12 is configured to vary the operation of the control mechanism sections 22a, 22b by opening and closing the control valves 36a, 36b. It should be noted that the modulator 12 of the illustrated embodiment is configured to have two sets each of primary and secondary pistons and cylinders.

Here, a nozzle 32 is interposed at a communication port with the inside of the control fluid pressure chamber 24 in the control fluid storage tank 28, and furthermore, a nozzle 32 is provided at the tip of the nozzle 32 in a horizontal direction so as to be below the surface of the stored fluid. Aim at nozzle hole 3
4 is attached to the nozzle cap 33 (see the enlarged part within the chain line).

By providing the nozzle 32 and nozzle cap 33 as described above, even if the control liquid in the hydraulic chamber 24 flows forcefully into the storage tank 28 when the control valve 36b on the storage tank 28 side is opened, The force is guided in the lateral direction by the nozzle hole 34 of the nozzle cap 33, thereby making it possible to prevent or reduce the control liquid from being blown and adhering to the inner surface of the rubber packing of the cap 30. Therefore, the life of the cap 30 can also be made longer than before. Similarly, when the cap 30 is opened for inspection or the like, the control liquid is ejected laterally within the storage tank 28, so there is no risk of it blowing upward and scattering outside. Note that the nozzle 3 can be used without particularly providing the nozzle cap 33.
Alternatively, the tip of the nozzle 32 may be closed, and a lateral nozzle hole 34 may be provided directly at the tip of the nozzle 32.

As described above, in the variable operation brake device according to this invention, there is no possibility that the control fluid may blow onto the cap of the control fluid storage tank and adhere to the cap, or may splash out when the cap is opened. can be easily prevented.

[Brief explanation of the drawing]

The figure shows an embodiment of a variable operation brake device according to this invention. 10... Master cylinder, 12... Modulator, 14a, 14b... Primary cylinder, 16
a, 16b...Primary piston, 18a, 18b...
...Secondary cylinder, 20a, 20b...Secondary piston, 22a, 22b...Hydraulic braking mechanism, 24
...Control fluid pressure chamber, 26...Control fluid pressurization source, 28...
... Control liquid storage tank, 30 ... Cap, 32 ... Nozzle, 33 ... Nozzle cap, 34 ... Nozzle hole, 36a, 36b ... Control valve, 40 ... Brake pedal.

Claims (1)

[Scope of utility model registration request] A control valve that opens and closes a control hydraulic chamber of a modulator that can adjust the braking force according to the pressure of a control hydraulic chamber interposed between a master cylinder and a hydraulic braking mechanism in a complementary manner. In a variable operation brake device that communicates with a control fluid pressurization source and a control fluid storage tank through a control fluid storage tank, a nozzle is interposed in a communication port with the control fluid pressure chamber in the control fluid storage tank, and A variable operation brake device characterized in that a nozzle hole is provided below the level of the stored liquid and facing away from the liquid level.