JPH0444881Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a directional control valve that supplies pressure oil from a plurality of pumps to one actuator.

Conventionally, when supplying pressure oil from a plurality of pumps to one actuator, as shown in Figs. 1 and 2, the pressure oil discharged from the first and second pumps _P1 and _P2 is supplied to the first - A known device is one in which the actuator A is supplied via the second valves V ₁ and V ₂ .

With this structure, the first and second ports _{a 1 ,} a ₂ , a ₃ , and a ₄ of the first and second valves V 1 _and V 2 are connected to the piping, respectively.
b ₁ to _{b 4} must be connected to actuator A,
As the number of pipes increases, piping work is troublesome, and there are no pipe connection points, making oil leaks more likely.

To solve this problem, for example,
As shown in Publication No. 61288 and Japanese Patent Application Laid-open No. 159438/1983, the pressure oil discharged from the first pump and the pressure oil discharged from the second pump are combined and then supplied to the inlet port of one valve. It is known that the combined discharge pressure oil is supplied to one actuator by switching the two.

If this is the case, the valve and actuator are 2
The number of piping can be reduced by simply connecting with regular piping.

However, in the above-mentioned system, the pressure oil discharged from the first and second pumps is combined and then supplied to the valve and actuator, so it is not possible to use the valve to supply only the pressure oil discharged from one pump to the actuator, so fine control is required. In addition, since a large amount of flow flows through the valve from the first and second hydraulic pumps, the pressure loss becomes large, and not only is it not possible to efficiently supply the pump discharge pressure oil to the actuator, but the noise is also increased. It ends up.

The present invention was developed in view of the above circumstances, and its purpose is to be able to supply the discharge pressure oil of multiple pumps to one actuator with a small number of piping, to improve fine operability, and to improve the pump discharge pressure. Pressure oil can be efficiently supplied to the actuator, noise generation can be reduced, and the conventional valve body can be easily manufactured by slightly improving it. By butting and connecting the first and second valve bodies, each passage, The drain port can be communicated without oil leakage, improving ease of assembly, and only one drain port piping is needed.
The object of the present invention is to provide a directional control valve that can be used as a main body, and for this purpose, a front surface 10a, a rear surface 10b, an upper surface 10c and a lower surface 10d, a left surface 10e and a right surface 10f.
A substantially rectangular parallelepiped body having
An inlet port 2 provided on the front surface 10a of the body and extending inward; a drain port 9 provided on the upper surface 10c of the body and extending inward and having a communication port 13 on the rear surface 10b; and the front surface 10a of the body.
a first passage 11 and a second passage 12 that are substantially parallel and communicate from the rear surface 10b to the left surface 10 of the body.
a spool opening 14a that communicates between e and the right side 10f and communicates with the first passage 11 and the second passage 12 as well as the inlet port 2 and the drain port 9; a neutral position that blocks the inlet port 2, the drain port 9, the first passage 11, and the second passage 12; and a neutral position that communicates the inlet port 2 with the first passage 11;
A first passage that communicates the second passage 12 with the drain port 9.
position, and communicating the inlet port 2 with the second passageway 12;
and a first spool 14 slidable into a second position communicating the first passageway 11 with the drain port 9; and a front face 15.
The body has a substantially rectangular parallelepiped shape having a and rear surfaces 15b, an upper surface 15c and a lower surface 15d, a left surface 15e and a right surface 15f, and an inlet port 3 extending inward provided on the front surface 15a of the body, and the upper surface of the body. 15c, which extends inward and has a communication port 18 located at a position corresponding to the communication port 13 of the first valve body 10; a passageway extending inward from the rear surface 15b of the body; The third passage 1 corresponds to the first passage 11 and the second passage 12 of the valve body 10 of No. 1, respectively.
6 and the fourth passage 17, the left side 15e of the body
and the right side 15f, and an opening 1 for a spool that communicates with the third passage 16 and the fourth passage 17, as well as the inlet port 3 and the drain port.
9a, the inlet port 3, the drain port and the third passage 16 are provided in the opening 19a for the spool;
and a neutral position in which the inlet port 3 is communicated with the third passage 16 and the fourth passage 17 is blocked.
a first position that communicates with the drain port, and a first position that communicates the inlet port 3 with the fourth passage 17 and the third passage 1
a second valve body 15 having a second spool 19 slidable into a second position communicating the first valve body 1 to the drain port;
The rear surface 10b of the second valve body 15 and the rear surface 15b of the second valve body 15 are butted and connected to form the first valve body 1.
A directional switching valve structure is adopted in which the first passage 11, second passage 12, and communication port 13 of the valve body 1 are connected to the third passage 16, fourth passage 17, and communication port 18 of the second valve body 15, respectively. With this directional control valve, by moving the first spool 14 and the second spool 19 to the first position or the second position, the first and second spools flowing into different inlet ports 2 and 3 can be
The discharge pressure oil of pumps P ₁ and P ₂ are combined to form the first passage 1.
1 or the second passage 12 to supply the actuator, and the pressure oil discharged from the second pump _P2 can be supplied to the second passage 12.
The spool 19 of the third passage 16 or the fourth passage 17
The pressure oil discharged from the second pump _P2 , which is supplied to the third passage 16 and the fourth passage 17, is transferred to the first and second passages.
Since it is supplied to the passages 11 and 12, when only the first or second spool 14 or 19 is operated, the first
Alternatively, only the discharge pressure oil of the second pump _P1 or _P2 is supplied to the actuator, and the first and second spools 1
4, 19, the first and second pumps P ₁ ,
P ₂ discharge pressure oil can be supplied to the actuator, and the rear surface 1 of the first valve body 10
0b and the rear surface 15b of the second valve body 15, the first and second passages 11 and 12, the third and fourth passages 16 and 17, and the drain port can be communicated with each other without oil leakage, and the drain piping can be connected to each other without oil leakage. can be made into one.

Embodiments of the present invention will be described below with reference to FIG. 3 and subsequent figures.

FIG. 3 is an overall perspective view, and FIG. 4 is a perspective view. The discharge passages ₁ 1 , 1 2 of the first and second pumps P ₁ , _{P 2 are} the inlet ports 2 of the second valves V ₁ , V ₂ . , 3, and the first and second ports 4, 5 of the first valve _V1 are connected to the actuator A via the first and second pipes 6, 7, and the first and second valves V ₁ ,
_V2 is connected with a bolt 8, and the drain port 9 of the first valve _V1 is connected to the tank T.

First valve body 10 of the first valve _V1
has a substantially rectangular parallelepiped shape with an upper surface 10c and a rear surface 10d facing each other, and a left surface 10e and a right surface 10f facing each other, and an inlet port 2 extending inward is provided on the front surface 10a.
The first and second passages 11 and 12 are provided in communication and approximately parallel to the front surface 10 of the first and second passages up to b.
The openings at a are the first and second ports 4 and 5.
First and second tank ports 21 and 22 are formed on both sides of the first and second passages 11 and 12, and these first and second tank ports 21 and 22 merge to form the first valve body. 10 opens as a drain port 9, and one of the first and second tank ports 21 and 22 opens as a communication port 13 on the rear surface 10b of the first valve body 10,
A spool opening 14a communicating with the left side 10e and right side 10f of the first valve body 10 is formed, and this spool opening 14a is connected to the first valve body 10.
Passage 11 and second passage 12 and inlet port 2
The first and second tank ports 21 and 22 are connected to each other, and the spool 14 is connected to the spool opening 14a.
is slidably provided. This spool 14 is held at a neutral position that blocks the first and second passages 11 and 12 of the inlet port 2 and the first and second tank ports 21 and 22, and by sliding left and right, the spool 14 connects the inlet port 2 to the first passage. 11, and the second passage 12 is connected to the second passage 11.
It is in the first position communicating with the tank port 22, and by sliding to the left, the inlet port 2 is connected to the second passage 12.
The second position communicates with the first tank port 21 and connects the first passage 11 with the first tank port 21 .

Second valve body 15 of the second valve _V2
are a front surface 15a and a rear surface 15b facing each other, an upper surface 15c and a lower surface 15d facing each other, and a left surface 15 facing each other.
The second valve body 15 has a substantially rectangular parallelepiped shape having a right side 15f and a right side 15f, and the rear surface 15b of the second valve body 15 and the rear surface 10b of the first valve body 10 are butted against each other and connected with bolts 8. The front surface 15a of the second valve body 15 has an inlet port 3 extending inward.
are formed, and third and fourth passages 16 and 17 extending inward are formed in the rear surface 15b, and these third and fourth passages 16 and 17 connect to the first and second passages 11 of the first valve body 10. , 12, and first and second tank ports 23 and 24 are formed on both sides of the third and fourth passages 16 and 17 to serve as drain ports, and these drain ports are connected to the rear surface 15b of the second valve body 15. A communication port 18 is opened at the bottom, and this communication port 18 communicates with the communication port 13 of the first valve body 10 .

A spool opening 19a communicating with the left side 15e and right side 15f of the second valve body 15 is formed, and this spool opening 19a is connected to the third passage 16, the fourth passage 17, and the first tank port 2.
3. The second tank port 24 and the inlet port 3 are communicated, and the spool 19 is connected to the spool opening 19a.
is slidably provided. This spool 19 is held at a neutral position that blocks the third and fourth passages 16 and 17 of the inlet port 3 and the first and second tank ports 23 and 24, and by sliding the spool 19 left and right, the inlet port 3 It becomes the first position where the inlet port 3 is connected to the third passage 16 and the fourth passage 17 is connected to the second tank port 24. By sliding to the left, the inlet port 3 is connected to the fourth passage 17 and the fourth passage 17 is connected to the second tank port 24. 3 aisle 16
is the second position communicating with the first tank port 23.

As such, the pressure oil discharged from the first port _P1 is supplied to the first or second ports 4, 5 from the first or second passages 11, 12, and the pressure oil discharged from the second pump P2 is supplied from the first or second passages 11, ₁₂ to the first or second ports 4, 5. It is supplied to the first or second ports 4, 5 from the third or fourth passages 16, 17 and the first or second passages 11, 12.

According to the present invention, the following effects are achieved.

The first and second inflows into different inlet ports 2 and 3
The discharge pressure oil of pumps P ₁ and P ₂ are combined to form the first passage 1.
Since it can be supplied to the actuator by supplying it to the first or second passage 12, it is sufficient to connect the first passage 11 and the second passage 12 to the actuator, and the number of piping can be reduced.

Further, the discharge pressure oil of the second pump P ₂ is supplied to the third passage 16 or the fourth passage 17 by the second spool 19, and the second pump P ₂ supplied to the third passage 16 or the fourth passage 17 The discharge pressure oil is transferred to the first and second passages 1.
Therefore, when only the first or second spool 14 or 19 is operated, only the discharge pressure oil of the first or second pump _P1 or _P2 is supplied to the actuator, and the first or second spool 14 or 19 is Spool 14, 19
When the actuator is operated, the discharge pressure oil of the first and second pumps P ₁ and P ₂ can be supplied to the actuator.

Therefore, when finely operating the actuator, only the first or second spool 14 or 19 can be operated to supply only the pressure oil discharged from the first or second pump _P1 or _P2 to the actuator. can improve sexual performance.

In addition, the first spool 14 controls the flow of pressure oil discharged from the first pump P ₁ and the second spool 19 controls the flow of pressure oil discharged from the second pump P ₂ .
Since the first and second spools 14 and 15 only have to control a flow rate smaller than the flow rate supplied to the actuator, the first and second spools 14 and 15
15 can be reduced. In other words, since the pressure loss is proportional to the square of the flow rate, the pressure is smaller than when the pressure oils discharged from the first and second pumps P ₁ and P ₂ are combined and then flowed to the spool.

Therefore, the pressure oil discharged from the first and second pumps P ₁ and P ₂ can be efficiently supplied to the actuator, and the noise generated at the time of pressure loss can be reduced.

Furthermore, the first valve body 10 and the second valve body 15 according to the present invention are easy to manufacture. That is, the first valve body 10 communicates the ports a ₁ to _{a 4} of the conventional example shown in FIG. The example can be applied, and the second valve body 15 can also be manufactured by closing one end side of the first passage 11 and the second passage and closing the drain port 9 in the first valve body 10. Therefore, the valve body structure of the present invention is advantageous in terms of manufacturing cost and time as a whole.

Further, a communication port 13 that communicates with the first passage 11, the second passage 12, and the drain port 9 is opened in the rear surface 10b of the first valve body 10, and a third passage 16, a fourth passage A communication port 18 communicating with the passage 17 and the drain port
are open, and the first passage 11 and the second passage 12 are connected to the third passage 16 and the fourth passage 17 by butting and communicating the rear surface 10b of the first valve body 10 and the rear surface 15b of the second valve body 15. The drain ports can communicate with each other, and by using a sealing material etc. on the butting surfaces, each passage and drain port can be communicated without oil leakage, improving assembly work efficiency, and drain piping can be connected to one another. It can be made into a book.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of the conventional example, Figure 3 is a perspective view showing an embodiment of the present invention, Figure 4 is a perspective view of Figure 3, Figure 5 is a cross-sectional view, and Figure 6 is a perspective view of the conventional example. FIG. 7 is a sectional view taken along the - line and - line in FIG. 5. 2 and 3 are inlet ports, 9 is drain port, 1
0 is the first valve body, 11 and 12 are the first and second passages, 13 is the communication port, 14 is the spool, 14a
15 is a second valve body, 16 and 17 are third and fourth passages, 18 is a communication port, 19 is a spool, and 19a is an opening for the spool.

Claims (1)

[Claims for utility model registration] Front surface 10a, rear surface 10b, upper surface 10c and lower surface 1
0d, a substantially rectangular parallelepiped-shaped body having a left surface 10e and a right surface 10f; A drain port 9 having a communication port 13 on the rear surface 10b, a first passage 11 and a second passage 1 that are substantially parallel and communicate from the front surface 10a of the body to the rear surface 10b.
2. The first passage 11 and the second passage 1 communicate with each other between the left surface 10e and the right surface 10f of the body.
2 and an opening 14a for the spool communicating with the inlet port 2 and the drain port 9, provided in the opening 14a for the spool,
a neutral position where the inlet port 2, the drain port 9, the first passage 11, and the second passage 12 are blocked; and a neutral position where the inlet port 2 is communicated with the first passage 11 and the second passage 12 is communicated with the drain port 9. 1 position and
The inlet port 2 is connected to the second passage 12 and the first
a first valve body 10 having: a first spool 14 slidable to a second position communicating passageway 11 with drain port 9; and front surface 15a, rear surface 15b, top surface 15c and bottom surface 1
5d, an approximately rectangular parallelepiped-shaped body having a left surface 15e and a right surface 15f, an inlet port 3 provided on the front surface 15a of the body leading to the inside, and an inlet port 3 provided on the rear surface 15b of the body leading to the inside. and the communication port 1 of the first valve body 10.
a drain port having a communication port 18 located at a position corresponding to 3; a first passage 1 of the first valve body 10 which is a passage leading inward from the rear surface 15b of the body;
A third passage 16 and a fourth passage 17 corresponding to the first and second passages 12, respectively, communicated between the left surface 15e and the right surface 15f of the body, and the third passage 16 and the fourth passage 1
7, a spool opening 19a communicating with the inlet port 3 and the drain port, and a neutral position provided in the spool opening 19a to block the inlet port 3, the drain port, the third passage 16, and the fourth passage 17; , inlet port 3
and a second position communicating the inlet port 3 and the fourth passage 17 and communicating the third passage 16 with the drain port. a second valve body 15 having a second spool 19 that is slidable in position; The first passage 11 and the second passage of the valve body 10
The passage 12 and the communication port 13 are connected to the second valve body 15.
A directional control valve that communicates with a third passage 16, a fourth passage 17, and a communication port 18, respectively.