JPH0244139Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a double check valve used in a hydraulic circuit of a hydraulic control device for an automatic transmission.

[Conventional technology]

Double check valves are often used in hydraulic circuits of hydraulic control devices for automatic transmissions for vehicles. In the conventional double check valve, as shown in the cross-sectional view in FIG. The check ball chamber 106 includes a ball 10 that freely moves between the ports 104 and 105.
7 is inserted, and a ball type with a port 108 formed on the side is often used.

[Problem that the invention attempts to solve]

This conventional ball type double check valve has the following problems.

A rubber ball or a steel ball is used as the ball 107, and the ball 107 is actuated by the hydraulic pressure 109 as shown in the operation diagrams in FIG. It will wear out and damage the port side with steel balls. Further, when steel balls were used, the response of switching the oil passage was poor due to the weight of the steel balls.

Additionally, in general, there are various restrictions such as the size and arrangement of the oil port when installing the valve body in the oil passage of the valve body, and the oil passage must be extremely small in order to facilitate the setting of the oil passage.

The present invention has a highly durable structure that prevents wear of the members that perform the valve function, provides reliable operation with excellent valve function responsiveness, and allows easy setting of oil passages. To provide a double check valve that can be configured as compactly as possible.

[Means for solving problems]

The double check valve of the present invention includes a cylindrical pipe having two input ports and one output port formed in a circumferential wall, and a thin plate spring inserted into the inner periphery of the cylindrical pipe. Spring above 2
The thin plate spring is fitted into the cylindrical pipe so as to cover the two input ports, and the thin plate spring is welded to the circumferential wall of the cylindrical pipe between the two input ports, and the thin plate spring is welded to the circumferential wall of the cylindrical pipe between the two input ports and the one output port. The device is characterized in that the ports are configured to be able to communicate with each other through a pressure difference between the input port and the output port.

[Effect of action and idea]

In the double check valve of the present invention, the port is closed by surface contact between the inner peripheral surface of the cylindrical pipe and the thin plate spring, so the port can be closed without contact between the corner of the port and the valve body. It prevents wear of the valve body and has excellent durability.
The leaf spring functions as an independently actuated valve body to selectively open and close the two input ports by comparing the hydraulic pressure level of each input port with the hydraulic pressure level of the output port, and the valve body Since the port is biased in the direction of closing due to its elasticity, reliable operation with excellent valve function responsiveness can be obtained, and excellent responsiveness of hydraulic pressure supply to the output port can be achieved.

In addition, it has a simple structure consisting of only two components, a cylindrical pipe and a thin plate spring, and the thin plate spring can be easily assembled into the cylindrical pipe, so the double check valve can be configured compactly and requires only a small amount of installation space in the hydraulic circuit. can be easily installed on the

Moreover, since all valve functions are housed within the cylindrical pipe, the same double check valve can be used in multiple parts of the hydraulic circuit, providing excellent versatility.

〔Example〕

Next, the present invention will be explained based on the embodiments shown in FIGS. 2 to 4.

Figure 2 is a front view of this embodiment, Figure 3 is a sectional view,
FIGS. 4D, 4E and 4F are explanatory diagrams of the operation.

Reference numeral 1 designates a double check valve consisting of a pipe 2 and a thin plate spring 6 inserted into the inner periphery of the pipe 2.

The pipe 2 has a predetermined thickness and length, and two ports 3 and 4 having a predetermined diameter in opposite directions and a port 5 in a direction perpendicular to the ports 3 and 4 are formed in the circumferential wall. There is.

The thin plate spring 6 fits inside the circumferential wall of the pipe 2 to cover the ports 3 and 4 of the pipe 2, and is fixed to the circumferential wall of the pipe 2 by spot welding at a midpoint 7 between the ports 3 and 4. There is.

As mentioned above, the double check valve 1 is constructed so that the two ports 3 and 4 can be opened and closed from the pipe 2 and the thin plate spring 6, so the structure is simple and all valve functions are housed in the cylindrical pipe. It has a compact configuration that is easy to use.

The double check valve 1 is used by being press-fitted into a predetermined position of a hydraulic circuit provided in a torque converter body or a valve body block of a hydraulic control device so as to close the upper and lower holes 8 and 9.

Next, the operation will be explained.

When hydraulic pressure is not supplied to both ports 3 and 4, the thin plate spring 6 closes the ports 3 and 4 and no flow of pressure oil occurs, as shown in FIG. 4D.

When pressure oil is supplied only to port 4, as shown in FIG.
opens inward by the hydraulic pressure acting on port 4,
Pressure oil is supplied from port 4 to port 5 as indicated by arrow C. At this time, the thin plate spring 6A on the port 3 side is pushed by the output hydraulic pressure to the port 5 generated in the pipe 2, tightly closing the port 3 and preventing oil from passing through. Further, since the thin plate spring 6A can close the port 3 without coming into contact with the corner of the port 3, the thin plate spring 6A, which serves as the valve body, will not wear out.

When pressure oil is supplied only to port 3, as shown in FIG.
opens inward by the hydraulic pressure acting on port 3,
Pressure oil is supplied from port 3 to port 5 as indicated by arrow D. At this time, the thin plate spring 6B on the port 4 side is pushed by the hydraulic pressure generated within the pipe 2, tightly closing the port 4 and preventing oil from passing through.

Also, if the port where pressure oil is generated is switched,
For example, when switching from the above case E to pressure oil is supplied from port 3 to port 5 as shown by arrow D, and when the hydraulic pressure acting on port 4 falls below the hydraulic pressure in pipe 2, the port 4 side The thin plate spring 6B immediately closes the port 4 due to its own elasticity.

The thin plate 6 may be made of various materials and plate thicknesses, such as beryllium copper, phosphor bronze, 17-7PH steel, Teflon, or composite materials thereof, depending on the conditions of use.

In the above embodiment, the connection of oil passages is exchanged within the same plane, but if necessary, the vertical positions of ports 3, 4, and 5 may be shifted or port 5 may be blocked to A port having a similar role may be provided above or below 2.

[Brief explanation of the drawing]

Figure 1 A, B, and C are operational explanatory diagrams showing a conventional double check valve in cross section, Figure 2 is a front view of the double check valve of the present invention, Figure 3 is a cross sectional view, and Figure 4 , E and F are explanatory diagrams of the operation. In the figure, 1... valve body, 2... pipe, 3, 4, 5
... Port, 6 ... Thin plate spring, 7 ... Spot weld, 8, 9 ... Hole.

Claims (1)

[Scope of utility model registration request] A cylindrical pipe having two input ports and one output port formed in a circumferential wall, and a thin plate spring inserted into the inner periphery of the cylindrical pipe, the thin plate spring being connected to the two input ports. The thin plate spring is fitted into the cylindrical pipe so as to cover the cylindrical pipe, and the thin plate spring is welded to the circumferential wall of the cylindrical pipe between the two input ports, and the two input ports and the one output port are inputted. A double check valve characterized by being configured to allow communication between a port and an output port through a pressure difference.