JPH0611265Y2 - Proportioning valve - Google Patents

Description

Detailed Description of the Invention a. TECHNICAL FIELD The present invention relates to a proportioning valve.

b. Prior Art FIG. 4 shows a conventional proportioning valve.

In this proportioning valve 1, the fluid supplied from the master cylinder or the like into the input pressure chamber 2 through the input port 2a is connected to the plunger 3 and the fixed valve seat 4 made of an elastic material as shown by the solid arrow. The pressure is fed to the output pressure chamber 5 through the interval, and is further pressure fed from the output port 5a to the wheel cylinder of the wheel or the like. When the pressure in the output pressure chamber 5 becomes equal to or higher than a certain pressure, the plunger 3 is actuated against the biasing force from the spring 6 and the lever 7 by the differential pressure acting on the plunger 3, and the valve body 3a of the plunger 3 is opened. It abuts against the seat 4 and shuts off between the input pressure chamber 2 and the output pressure chamber 5. Further, when the pressure in the input pressure chamber 2 rises, the valve body 3a of the plunger 3 is separated from the valve seat 4 again, and the fluid in the input pressure chamber 2 is pumped to the output pressure chamber 5. When the pressure in the output chamber 5 with respect to the pressure in the input pressure chamber 2 reaches a constant value, the plunger 3
The valve body 3a contacts the valve seat 4, and the input pressure chamber 2 and the output pressure chamber 5 are shut off from each other.

The proportioning valve 1 has a check valve mechanism in addition to the shutoff valve mechanism described above. This check valve mechanism allows the fluid in the output pressure chamber 5 to be fed to the input pressure chamber 5 when the pressure in the output pressure chamber 5 exceeds a certain pressure with respect to the pressure in the input pressure chamber 2, for example, when the depression force of the master cylinder is released. It is for returning to the chamber 2. In this check valve mechanism, the output pressure chamber 5
Is higher than the pressure in the input pressure chamber 2, the output pressure chamber 5
Fluid bends the outer peripheral surface of the valve seat 4 and flows out to the input pressure chamber 2,
Thereby, the pressure of the output pressure chamber 5 is reduced.

c. DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In such a proportioning valve 1, when the pressure of the input pressure chamber 2 continuously rises from the non-actuated state, until the plunger 3 starts to bend the spring 6, FIG. In the OA line, and then in the AB line. The characteristic of the AB line corresponds to the state in which the valve body 3a repeatedly contacts and departs from the valve seat 4, but the proportioning valve 1 may generate an abnormal noise at this time.

Therefore, an object of the present invention is to provide a proportioning valve that prevents the generation of abnormal noise.

d. In the proportioning valve of the present invention, a fixed valve seat is arranged between the input pressure chamber and the output pressure chamber, and a plunger provided with a valve element at the tip is connected to the fixed valve seat. They are densely and slidably arranged, and further, the plunger is provided with a passage that connects the input pressure chamber and the output pressure chamber only when the valve body is separated from the fixed valve seat. .

e. Action With the proportioning valve configured in this way, the generation of abnormal noise disappeared.

This is because the fluid in the input pressure chamber is sent to the output pressure chamber without passing through the inner peripheral portion of the valve seat made of an elastic material, and the vibration of the valve seat is reduced as much as possible. This is because the slidable arrangement on the fixed valve seat made of an elastic material damps the vibration when the valve body and the valve seat separate from each other as much as possible.

f. Embodiment FIG. 1 shows a proportioning valve according to the present invention, and FIG. 2 shows a main part thereof.

The proportioning valve 10 is a load-responsive proportioning valve. In this valve 10, a large-diameter input pressure chamber 12 and a small-diameter output pressure chamber 13 are formed in a housing 11, and a valve seat 14 made of an elastic material is installed at the boundary between these chambers 12, 13. ing. As shown in FIG. 2, the valve seat 14 is a cup packing and has a lip 14a on the inner circumference. Also, the housing 11 has a valve seat 14
Plunger 15 is installed through the
a contacts the peripheral surface of the plunger 15 and seals between the valve seat 14 and the plunger 15. The plunger 15 has a flange portion 15a, and the flange 15a is in sliding contact with the inner peripheral surface of the input pressure chamber 12. Further, a cutout 15b is formed in a part of the funnel 15a, and both parts of the input pressure chamber 12 defined by the flange 15a communicate with each other through the cutout 15b. Further, the plunger 15 has a valve body 15c at the tip on the output pressure chamber 13 side. Further, one end 16a of the plunger 15 is opened to the input pressure chamber 12,
The other end 16b has a passage 16 that opens at the base of the valve body 15c. The plunger 15 is biased by a spring 18 provided between the plunger 15 and the load detection lever 17,
15c is maintained in a state of being separated from the valve seat 14.

The operation of the proportioning valve 10 will be described below.

Input pressure chamber 1 from master cylinder, etc. via input port 12a
When the fluid is supplied to the valve 2, the fluid flows through the passage 16 into the valve seat 14
Between the valve body 15c and the valve body 15c and is discharged into the output pressure chamber 13.
It is sent to the wheel cylinder or the like of the wheel via the output port 13a. When the pressure in the output pressure chamber 13 exceeds a certain pressure, the differential pressure acting on the plunger 15 causes the plunger 15
Is operated against the urging force of the spring 18, the valve body 15c abuts the valve seat 14, and disconnects the input pressure chamber 12 and the output pressure chamber. Further, when the pressure of the input pressure chamber 12 rises, the valve body 15c of the plunger 15 is separated from the valve seat 14 again, and the input pressure chamber 1
The second fluid is sent to the output pressure chamber 13 again. Then, when the pressure of the output pressure chamber 13 with respect to the pressure of the input pressure chamber 12 reaches a constant value, the valve body 15c of the plunger 15 abuts the valve seat 14, and the input pressure chamber 12 and the output chamber 13 are disconnected. It

When the operating force of the master cylinder or the like is released and the pressure of the input pressure chamber 12 is reduced, the fluid in the output pressure chamber 13 passes through the back surface and the outer peripheral surface of the valve seat 14 and further through the notch 15b, and then the input pressure chamber 12
Returned to.

The passage formed in the plunger 15 in the above embodiment
16 can also be formed as shown in FIG.

g. Effect of the Invention As described above, in the proportioning valve according to the present invention, when the fluid is pressure-fed from the input pressure chamber to the output pressure chamber, the fluid is fed without passing through the valve seat, resulting in abnormal noise. It was possible to eliminate the occurrence of.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a load-responsive proportioning valve as a proportioning valve according to the present invention, FIG. 2 is an enlarged sectional view showing an essential part thereof, and FIG. 3 is a modification of the essential part. FIG. 4 is a longitudinal sectional view showing a conventional proportioning valve, and FIG. 5 is a diagram showing general characteristics of the proportioning valve. 10 …… proportioning valve, 11 …… housing, 12 …… input pressure chamber, 12a …… input port, 13 …… output pressure chamber, 13a …… output port, 14 …… valve seat, 14a …… lip, 15 ... Plunger, 15a ... Flange, 15b ... Notch, 15c ... Valve body, 16 ... Passage, 16a ... One end, 16a ... Other end, 17 ... Load detection lever, 18 ... Spring.

Claims (1)

[Scope of utility model registration request] 1. A fixed valve seat is provided between an input pressure chamber and an output pressure chamber, and a plunger having a valve element at its tip is provided in the fixed valve seat so as to be liquid-tight and slidable. Further, the proportioning valve is characterized in that the plunger is provided with a passage that connects the input pressure chamber and the output pressure chamber only when the valve body is separated from the fixed valve seat.