JP2536157Y2 - Directional switching valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a directional control valve provided with a plurality of spool valves for controlling the flow direction of hydraulic oil.

(Prior Art) The conventional directional control valve shown in FIGS. 3 and 4 is a multiple direction valve in which a plurality of identically configured spool valves 1 are fastened between an inlet body I and an outlet body O. Direction switching valve. The aforementioned inlet portion body I, but forms a pump port P _o and the tank port P _t and the inlet port P _i, the inlet port P _i is communicated with the pump P through the pump port P _o I have.

Further, the inlet port as described above P _i is the inlet port 2 formed in the valve body a spool valve 1 of the most upstream
The pressure oil discharged from the pump P is guided to the high-pressure flow path 3 through the inlet body I.

FIG. 4 shows a sectional view of each spool valve, for example, the most upstream spool valve 1. As shown in FIG. 4, the high-pressure flow path 3 has a load flow path branched therefrom. 4 and the load flow path 4 communicates with the supply passage 5.

Actuator ports A and B are formed in the valve body a, and the inner end of the actuator port A is opened to the flow passage 6 and the inner end of the actuator port B is opened to the flow passage 7.

Thus, when the spool 1a of the spool valve 1 is held in the neutral position, the pressure oil supplied from the pump P flows into the inlet port P _i via the pump port P _o of the inlet portion body I. Then, the pressure oil reaches the outlet port P _u which is formed to the outlet portion body O by way of the neutral flow passage 11 formed in the valve body a of the spool valve. Then, the outlet port P _u are each valve body a
Through to return passage 10 formed so communicates with the tank port P _t, the pressure oil is returned to the tank, not shown as it is.

Now, when any one of the spool valves, for example, the spool 1a of the most upstream spool valve moves from the neutral position to the left in the drawing to the state shown in the drawing, the neutral flow path 11 is formed by the land r formed in the center of the spool 1a. It is communicating with blocking the inlet port P _i, the supply passage 5 and the flow path 7, the spool
The return passage 10 and the flow passage 6 communicate with each other through the first annular groove 8 formed in the spool 1a, while communicating with the second annular groove 9 formed in the spool 1a.

Accordingly, the pressure oil supplied to the inlet port P _i along with via inlet port P _i flows into the high-pressure line 3 of the spool valve 1, and flows into the supply passage 5 is branched from the high-pressure line 3.

Then, the pressure oil flowing into the supply passage 5 further
Supply passage 5 → second annular groove 9 → passage 7 → supplied to a cylinder which is an actuator (not shown) via actuator port B, while return oil of the cylinder is supplied from actuator port A → flow passage 6 → first. The annular groove 8 → returns to a tank (not shown) via the return passage 10.

When the spool 1a is moved from the neutral position to the right in the drawing, the supply passage 5 and the flow passage 6 communicate with each other via the first annular groove 8, while the return passage 10 and the flow passage 7 It communicates via the second annular groove 9.

Therefore, the pressure oil flowing into the supply passage 5 is supplied to the cylinder via the supply passage 5 → the first annular groove 8 → the flow passage 6 → the actuator port A, while the return oil of the cylinder is Actuator port B → flow path 7
→ The second annular groove 9 → returns to the tank via the return passage 10.

Pressure oil in the (present challenges invention is to solve) conventional directional control valve which is as described above, that the inlet section body I having a pump port P _o, continuously provided a spool valve 1, it is discharged from the pump Is supplied to the spool valve 1 via the inlet body I.

Therefore, there is a problem that the combined direction length of the directional control valve is increased by the length of the inlet body.

An object of the present invention is to provide a directional control valve that can be mounted on an ultra mini excavator or the like in which space for mounting the directional control valve is narrow.

(Means for Solving the Problems) According to the present invention, a spool is provided in a valve body, and a spool valve for communicating an actuator port to a supply side or a return side in accordance with movement of the spool. This is based on the directional switching valve provided.

Under the premise of the above-described directional control valve, the present invention forms a pump port communicating with a return passage and a pump in a valve body of a specific spool, and communicates an inlet port with an inner end of the pump port. Forming a first supply passage and a second supply passage branching from the port;
A pump valve communicating with a supply passage of another spool valve via the inlet port, and a spool valve for communicating an actuator port to a supply side or a return side according to movement of the spool. It has features.

(Operation) When the pressure oil from the pump is directly supplied to a specific spool valve having a pump port, the pressure oil is also supplied to the other spool valves via the specific spool valve.

(Effect of the Present Invention) According to the directional switching valve of the present invention, since the inlet portion as in the related art does not need to be provided, the length of the direction switching valve in the combination direction can be shortened accordingly.

(Embodiment of the present invention) The embodiment of the present invention shown in FIGS. 1 and 2 is a specific spool valve having a pump port formed outside a multiple spool valve 1 as shown in FIG. 12,12 are provided.

As described above, since the pump ports are formed in the spool valves 12, 12, the conventional inlet part can be omitted.

Since the plurality of spool valves 1 provided between the specific spool valves 12 and 12 are the same as the conventional spool valve, the configuration of the spool valve will be described in detail with reference to FIG. Omitted.

As shown in FIG. 2, the specific spool valves 12 and 12 have a pump port _Po formed in a valve body a having a pair of actuator ports A and B, and an inner end thereof is connected to the valve body a. The inlet port 13 is formed with an opening. Then, the inlet port 13 through the pump port P _o, communicates with the pump P, and to guide the inlet port 13 of the pressure oil discharged from the pump P via a pump port P _o.

The inlet port 13 is connected to a high-pressure flow path 14 and a first supply path 15 and a second supply path 16 branching therefrom. The inlet port 13 is connected to a neutral flow path 17 formed in the valve body a. They are communicated via a high-pressure channel 14. Further, the inlet port 13 communicates with the high-pressure flow path 3 of the spool valve 1 connected to a specific spool valve 12.

Thus, the pressure oil supplied from the pump P is supplied to the inlet port 13 via the pump port P _o.

Now, when the spool 12a provided inside the specific spool valve 12 and the spool 1a of each spool valve 1 are held at the neutral position in the drawing, the pressure oil supplied from the pump P flows from the inlet port 13 to the high-pressure flow path 14 Via neutral flow path
17 and is returned to a tank (not shown) via the neutral flow path 11 of each spool valve 1 communicating with the neutral flow path 17.

Now, when any one of the spool valves, for example, the spool 12a of the specific spool valve 12 on the most upstream side moves from the neutral position in the drawing to the right in the drawing, the flow passage formed in the valve body a
18 and the first supply passage 15 are connected to the first
While communicating through the annular groove 20, the flow passage 19 and the return passage 22
Communicate with each other through a second annular groove 21 formed in the spool 12a.

Therefore, the pressure oil supplied to the inlet port 13 is supplied to the actuator cylinder (not shown) via the first supply passage 15 → the first annular groove 20 → the flow passage 18 → the actuator port A. The return oil from the cylinder returns to the tank via the actuator port B → the flow passage 19 → the second annular groove 21 → the return passage 22.

When the spool 12a is moved from the neutral position to the left in the drawing, the flow path 19 and the second supply path 16 communicate with each other through the second annular groove 21, while the flow path 18 and the return path
22 communicate with each other through the first annular groove 20.

Therefore, the pressure oil supplied to the inlet port 13 is supplied to the second supply passage 16 → the second annular groove 21 → the flow passage this time.
19 → while supplied to the cylinder via the actuator port B, the return oil from the cylinder returns to the tank via the actuator port A → the flow passage 18 → the first annular groove 20 → the return passage 22.

Even when the spool 12a is switched as described above, the inlet port 13 is also in communication with the high-pressure flow path 3 of each spool valve 1 fastened to the specific spool valve 12, so that hydraulic oil is supplied to each spool valve 1. Can be supplied.

According to the above embodiment, the specific spool valve 12 in which the pump port _Po is formed integrally with the valve body a is connected to the spool valve 1. Then, the pressure oil discharged from the pump P, and supplies to a specific spool valve 12 via a pump port P _o provided to a particular spool valve 12, spool valves and continuously to a specific spool valve 12 1 We are also trying to supply.

That is, the conventional inlet member I is replaced with a specific spool valve.

Therefore, there is no need to mount the conventional inlet part, and the length of the direction switching valve in the combined direction can be reduced accordingly.

[Brief description of the drawings]

1 and 2 show this embodiment. FIG. 1 is a plan view of the directional control valve when the directional control valve is assembled, and FIG. 2 is a plan view of FIG.
Sectional view of the inlet spool valve showing a section taken along the line II-II,
3 and 4 show a conventional directional control valve, FIG. 3 is a cross-sectional view of the directional control valve, and FIG. 4 is a cross-sectional view of a spool valve showing a cross-section taken along line IV-IV of FIG. . DESCRIPTION OF SYMBOLS 1 ... Spool valve, P ... Pump, 5 ... Supply passage, a ... Valve body, 12 ... Inlet spool valve, 12a ... Spool, A,
B ... actuator port, P _o ... pump port, 10, 22
... Return passage, 13 ... Inlet port, 15 ... First supply passage, 16 ... Second supply passage.

Claims (1)

(57) [Scope of request for utility model registration] 1. A directional control valve having a spool provided inside a valve body and having a spool valve connected to a supply side or a return side in accordance with movement of the spool. A pump port communicating with a return passage and a pump is formed in a valve body of a specific spool valve, an inlet port is communicated with an inner end of the pump port, and a first supply passage and a second supply branch branched from the inlet port. While forming the passage, the pump port communicates with the supply passage of another spool valve via the inlet port, and the actuator port communicates with the supply side or communicates with the return side according to the movement of the spool. Directional switching valve with spool valve.