JPH0422084Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a pressure selection device for selecting a pressure from each valve of a multiple valve used, for example, in a vehicle mechanical hydraulic system.

(Prior Art) Conventionally, in vehicle mechanical hydraulic systems, marine mechanical hydraulic systems, etc. in which a large number of switching valves are installed, valve casings a and b each having a flow path formed therein are connected by bolts, as shown in the first diagram. These valves are pressed together and fixed together to form a multiple valve. In such multiple valves, the highest pressure is selected from each valve housing,
When operating a bleed-off type flow control valve c to perform bleed-off control using that pressure, a shuttle valve d must be specially provided in the valve housing a.
This has the disadvantage of being expensive.

Furthermore, conventionally, in this type of press-fit fixed type multiple valve, a chamber is provided at the end of the pressure flow path, another pressure guide hole is opened on the side of the chamber, and a ball is housed in the chamber. Later, a ring-shaped bushing was fitted to make a shuttle valve. (Japanese Unexamined Patent Publication No. 186602/1983). In this case, there is no need to provide the shuttle valve separately from the valve casing, resulting in lower costs.

(Problems to be Solved by the Invention) In the case where a ring-shaped bushing is provided as described above, the bushing merely serves as a seat. Shuttle valves use steel balls, and the valve casing of multiple valves is generally made of cast metal, which has the disadvantage that the seat portion that comes into contact with the balls is prone to wear. This problem cannot be solved with a configuration that includes a button.
In order to reduce the wear on the seat part, we thought that it would be effective to reduce the amount of movement of the ball and reduce the impact force.

The object of the present invention is to provide a pressure selection device that can be easily incorporated into the valve housing of a multiple valve, has low wear, and has good durability.

(Means for Solving the Problems) In the present invention, a plurality of valve casings are prepared, pressing surfaces parallel to each other are formed on both sides of each valve casing, and a chamber is formed on one of the pressing surfaces. An end of the pressure passage in the valve housing is opened at the back of the chamber, and an end is opened at the side of the chamber on the pressure contact surface opposite to the one pressure contact surface and at a position opposite to the chamber. The other end of the opened pressure guide hole is opened, and the ball is housed in the chamber so as to be able to reciprocate, and then the pressure contact surfaces of each valve housing are brought into contact with each other by communicating the opening at the end of the pressure guide hole with the chamber. In a fixed type multiple valve, the chamber is a cylindrical body, and one end thereof is formed with a concave hole larger than the end communicating with the end of the pressure flow path. A first small hole smaller than the recessed hole is formed at a position opposite to the recessed hole and communicates with the one pressure contact surface, and an annular notch is formed on the circumferential surface of the recessed hole side. The above object is achieved by fitting therein a bush having a plurality of second small holes which communicate the inside of the recessed hole with the other end of the pressure introducing hole.

(Function) Each valve casing is constructed into a multiple valve by pressing the pressure contact surfaces against each other and fixing them with bolts. At that time, a ball is placed in the chamber formed on the pressure contact surface of one valve casing. Insert the bushing into the recessed hole,
If the chamber and one end of the pressure guide hole opened in the pressure contact surface of the other valve case are opposed to each other and both valve cases are fixed by pressure contact,
The pressure in the pressure channel in the one valve housing or the pressure in the pressure guide hole in the other valve housing, whichever is higher, is selected and applied to the pressure guide hole in the one valve housing. The water can be extracted through the plurality of second small holes in the bush, eliminating the need to provide a separate shuttle valve from the valve housing.

Furthermore, since the pressure guide hole in one of the valve cases is configured to communicate with the inside of the recessed hole through the plurality of second small holes in the bush and the notches around the second holes, the opening position of the pressure guide hole is Pressure can be extracted even if the pressure is slightly off, making it possible to form the concave hole to the minimum necessary length for the ball to stroke without having to consider the tolerance of the opening position of the pressure guide hole.
As a result, the amount of movement of the ball can be reduced, the impact force on the seat can be reduced, and wear of the seat can be reduced.

(Embodiment) An embodiment of the present invention will be described with reference to a case in which two valve casings shown in FIGS. , 12, each of which has a slidable spool 3, a pump passage 5 connected to a pump 4, a tank passage 7 connected to a tank 6, and a pair of actuator channels 9 connected to the actuator 8,
10 are provided in the same arrangement, respectively, and the spools 3
When the pump flow path 5 and tank flow path 7 are slid, the pump flow path 5 and the tank flow path 7
are connected to either of the actuator channels 9 and 10, respectively, and the actuator 8 is driven. Each valve housing 1, 2 has a pressure contact surface 11, 1 with a smooth finish.
2 are brought together and fixed with bolts.

A chamber 13 consisting of a circular hole is formed substantially perpendicularly to one pressure contact surface 11 of each valve housing 1, 2, and a circular pressure flow path provided in the valve housing 1, 2 is provided in the inner part of the chamber 13. 1
4 ends are opened. When the spool 3 is slid, the pressure fluid supplied to the actuator 8 flows through the pressure passage 14 into the passage 15 inside the spool 3.
guided through. Reference numeral 16 denotes a pressure guide hole, one end of which opens in the pressure contact surface 12 opposite to the pressure contact surface 11 and at a position opposite to the chamber 13; 13, and when the valve casings 1 and 2 are pressed and fixed to each other, the third
As shown in FIG. 4, the chamber 1 of one valve housing 1
3 communicates with the opening at one end of the pressure guide hole 16 of the other valve housing 2.

Fitted into the circular chamber 13 is a bush 17 made of a cylindrical body that communicates with the end of the pressure flow path 14 and has a cylindrical recess 19 formed therein with a diameter larger than the end. be done. The details of the bush 17 are as shown in FIG. A first small hole 22 is formed which is smaller than the recessed hole 19 and preferably has the same diameter as the end of the pressure flow path 14, and further has a first small hole 22 that is smaller than the recessed hole 19 that communicates the inside with the one pressure contact surface 11,
An annular notch is formed in the circumferential surface on the 9 side, and a plurality of second small holes 23, 23 are opened therein to communicate the inside of the recessed hole 19 to the other end of the pressure introducing hole 16.

The length of the bush 17 in the axial direction is formed to be just long enough to fit into the chamber 13. In addition, the opening position of the pressure guide hole 16 to the chamber 13 may be slightly shifted, but even if such a situation occurs, the recessed hole 1
9 communicates with the pressure guide hole 16 through the second small holes 23, 23 of the bush 17 and the notch on the outer periphery. Therefore, it is sufficient to form the concave hole 19 to the minimum necessary length without considering the deviation of the opening position of the pressure guide hole 16, that is, the tolerance. As a result, the ball 1 inside the recessed hole 19
8 becomes smaller, and wear due to impact is reduced.

24 is a seal ring, 25 is a bleed-off type flow control valve that performs bleed-off operation under control of the higher pressure of the pressures generated in both valve housings 1 and 2, and 26 is an end plate.

In the case of this embodiment, each of the valve housings 1 and 2 is fixed with bolts or the like with the pressure contact surface 11 of one valve housing 1 and the pressure contact surface 12 of the other valve housing 2 in close contact with each other, as shown in the third diagram. , is configured as a multiple valve, but when it is fixed,
If a bush 17 is formed with a recessed hole 19 in the chamber 13 having a length that allows the ball 18 to move to the minimum required extent, and the ball 18 is inserted into the recessed hole 19, the recess of the bush 17 is inserted. In the hole 19, the higher pressure of the pressure channel 14 of the valve housing 1 or the pressure guide hole 16 of the valve housing 2 is selectively extracted to the pressure guide hole 16 of the valve housing 1 by movement of the ball 18, Since the relief valve 25 can be operated with the higher pressure and the ball 18 moves the minimum necessary distance,
Wear of the valve housing 1 and bush 17 due to the impact of movement can be reduced.

Note that three valve housings can be fixed to each other under pressure as shown in FIG. 5, and in this case, the highest pressure of the three valve housings can be selected.

(Effect of the invention) As described above, according to the invention, in the chamber formed on one pressure contact surface of the valve casing of the multiple valve, a recessed hole communicating with the end of the pressure flow path in the valve casing is provided on one end side. is formed,
A first small hole, which is smaller than the recessed hole, is formed at a position opposite to the end portion, which communicates the inside of the recessed hole with one pressure contact surface of the valve housing, and a notch is formed on the circumferential surface on the side of the recessed hole. and a plurality of second holes that connect the inside of the recessed hole to the pressure guide hole.
Since the bushing with the small hole has been fitted, if the ball is placed in the concave hole of the bushing and the multiple valve casings are fixed with their pressure contact surfaces aligned, the inside of each valve casing can be inserted using the valve casing. A high pressure can be selected, there is no need to provide a special shuttle valve, and a notch is provided on the outer periphery of the bushing and a plurality of second small holes are formed therein. The length of the hole can be shortened to the minimum required length without considering the tolerance of the opening position of the pressure guide hole, reducing wear on the valve case and bushing, and machining is easy, inexpensive and multi-purpose. This has advantages such as being able to provide a pressure selection device to the continuous valve.

[Brief explanation of the drawing]

Fig. 1 is a line diagram of the conventional example, Fig. 2 is a cross-sectional side view of the embodiment of the present invention, Fig. 3 is a side view cut along the - line of Fig. 2, Fig. 4 is an enlarged view of the main part, Fig. 5 The figure is a sectional view of another embodiment of the present invention. 1, 2... Valve housing, 11, 12... Pressure contact surface, 13
...chamber, 14...pressure channel, 16...pressure guide hole,
17...butsu, 18...ball, 19...concave hole, 22...first small hole, 23...second small hole.

Claims (1)

[Scope of utility model registration request] A plurality of valve casings are prepared, pressure contact surfaces parallel to each other are formed on both sides of each valve casing, a chamber is formed on one of the pressure contact surfaces, and a pressure passage inside the valve casing is formed in the inner part of the chamber. The other end of the pressure guide hole is opened in the side of the chamber, the end of which is opened on the pressure contact surface opposite to the one pressure contact surface and at a position opposite to the chamber. In a multiple valve of the type in which a ball is housed in a chamber so as to be able to freely move back and forth, and then the press-contact surfaces of each valve case are connected to the chamber and the opening at the end of the pressure guide hole, and the balls are press-fixed to each other, , is a cylindrical body, and a recessed hole larger than the end portion communicating with the end portion of the pressure flow path is formed at one end side thereof, and a recessed hole larger than the end portion communicating with the end portion of the pressure passage is formed at a position opposite to the end portion. A first small hole smaller than the recessed hole is formed to communicate with the pressure contact surface of the recessed hole, and an annular notch is formed in the circumferential surface of the recessed hole side, and the recessed hole is connected to the other end of the pressure guide hole. 1. A pressure selection device for a multiple valve, characterized in that a bush is fitted with a plurality of second small holes that communicate with each other.