VALVE BLOCK AND MULTI-CONTROL VALVE DEVICE WITH THIS

Abstract

Valve block for a multiple control valve device in which a plurality of valve blocks are arranged in a predetermined direction, comprising: a block body; first and second check valves that allow the flow of hydraulic fluid through the block body in one direction and prevent the flow of the hydraulic fluid in the opposite direction; and a pressure equalization valve configured to equalize the pressure of the hydraulic fluid flowing in the block body, wherein the block body comprises a first side face that is oriented in a first direction orthogonal to the predetermined direction, the first check valve, the second check valve and the pressure equalization valve are inserted by the first side face of the block body such that they are inserted parallel to each other.

Description

Technical area

[0001] The invention relates to a valve block for a multiple control valve device in which a plurality of valve blocks are aligned in a predetermined direction, and to a multiple control valve device comprising the same. Background technology

[0002] Industrial machinery such as construction machinery is equipped with a multiple control valve device for controlling the flow of hydraulic fluid to each of a plurality of hydraulic cylinders. A multiple control valve device is known, for example, from Patent Document 1. The multiple control valve device of Patent Document 1 includes a plurality of valve blocks aligned in a predetermined direction. The valve block includes a block body and a directional control valve. The directional control valve is inserted through the block body. In the valve block, the flow of hydraulic fluid is controlled by operating the directional control valve. State of the art documentPatent document

[0003] Patent Document 1: JP2021092227(A) Invention SummaryProblem to be solved by the invention

[0004] In the multi-control valve of Patent Document 1, the valve block may be equipped with the following valves in addition to the directional control valve. For example, the valve block is equipped with two check valves and a pressure relief valve. In the valve block, the hydraulic fluids flowing from the two check valves are combined and then directed to the pressure relief valve. The two check valves and the pressure relief valve are inserted through the block body. It is desirable that the block body, through which the two check valves and the pressure relief valve are inserted, have a compact structure.

[0005] It is therefore an object of the present invention to provide a valve block in which a block body through which two check valves and a pressure compensation valve are inserted has a compact design. Means to solve the problem

[0006] A valve block of the present invention is for a multiple control valve device in which a plurality of valve blocks are arranged in a predetermined direction, and comprises: a block body; first and second check valves that allow flow of hydraulic fluid through the block body in one direction and prevent flow of the hydraulic fluid in the opposite direction; and a pressure compensating valve configured to equalize the pressure of the hydraulic fluid flowing in the block body, wherein the block body includes a first side surface facing a direction in a first direction orthogonal to the predetermined direction, the first check valve, the second check valve, and the pressure compensating valve being inserted from the first side surface of the block body so as to be parallel to each other.

[0007] According to the invention, the first check valve, the second check valve, and the pressure relief valve are inserted from the first side surface of the block body in such a way that they are parallel to each other. Therefore, the block body can be formed compactly in the predetermined direction. In addition, interference of the first check valve, the second check valve, and the pressure relief valve with other adjacent valve blocks in the predetermined direction is suppressed.

[0008] A multiple control valve system of the present invention comprises a plurality of valve blocks including the aforementioned valve block, wherein the plurality of valve blocks are arranged adjacently in the predetermined direction.

[0009] According to the present invention, the multiple control valve device having the above-mentioned functions can be realized. Effect of the invention

[0010] According to the invention, the block body into which the two check valves and the pressure compensation valve are inserted can be constructed compactly.

[0011] The above objects, other objects, features and advantages of the invention will become apparent from the following detailed description of suitable embodiments with reference to the accompanying drawings. Short description of the drawings Fig. 1 is a perspective view showing a multiple control valve device having a valve block. Fig. Figure 2 is a perspective view of the valve block showing its top side. Fig. 3 is a circuit diagram showing hydraulic circuits used in the valve block of Fig. 2 are trained. Fig. 4 is a front view showing the front of the valve block of Fig. 2 shows. Fig. 5 is a right side view showing the right side of the valve block of Fig. 2 shows. Fig. 6 is a left view showing the left side of the valve block of Fig. 2 shows. Fig. 7 is a plan view showing the top of the valve block of Fig. 2 shows. Fig. 8 is a cross-sectional view of the valve block of Fig. 4 along section line VIII-VIII. Fig. 9 is a cross-sectional view of the valve block of Fig. 4 along section line IX-IX. Fig. 10 is a cross-sectional view of the valve block of Fig. 7 along section line XX. Fig. 11 is a cross-sectional view of the valve block of Fig. 7 along section line XI-XI. Fig. 12 is a cross-sectional view of the valve block of Fig. 7 along section line XII-XII. Fig. 13 is a bottom view showing a bottom side of the valve block of Fig. 2 shows. Embodiments

[0012] A multiple control valve device 1 and a valve block 2 provided therein according to an embodiment of the present invention will now be described with reference to the above-mentioned drawings. The directional concept used in the following description is for convenience of explanation and does not limit the direction of the configuration of the invention. The multiple control valve device 1 and valve block 2 described below are only one embodiment of the invention. Accordingly, the invention is not limited to the embodiment, and additions, deletions, and changes may be made to the extent that the purpose of the invention is not deviated from. <mehrfachsteuerventilvorrichtung>

[0013] The Fig. The multiple control valve device 1 shown in Figure 1 is provided in hydraulic machines, including industrial machines such as construction machines. The multiple control valve device 1 controls the flow (in this embodiment, the direction and flow rate) of the hydraulic fluid (e.g., pressurized oil or water). In further detail, the multiple control valve device 1 is connected to a plurality of pumps 8L, 8R (see Fig. 3 below) and a plurality of actuators (not shown). In the present embodiment, the multiple control valve device 1 is connected to two pumps 8L, 8R. The multiple control valve device 1 supplies and discharges hydraulic fluid to the plurality of actuators by controlling the flow of hydraulic fluid discharged from the pumps 8L and 8R. The multiple control valve device 1 includes a plurality of valve blocks 2-7. In this embodiment, the multiple control valve device 1 includes six valve blocks 2-7. The number of valve blocks provided in the multiple control valve device 1 is not limited to six, but may be five or fewer or seven or more. The six valve blocks 2-7 are arranged adjacent to each other in a predetermined direction. The five valve blocks 3-7 are configured, for example, as follows.

[0014] That is, the five valve blocks 3-7 have block bodies 3a-7a and directional control valves 3b-7b. Each of the block bodies 3a-7a is formed, for example, in a rectangular shape with a thickness in the predetermined direction. That is, the block bodies 3a-7a have main surfaces and rear surfaces in the predetermined direction. The block bodies 3a-7a have sides in a first and a second direction, each of which is orthogonal to the predetermined direction. The first and second directions intersect each other. In this embodiment, the first and second directions are orthogonal to each other. Fig. 1, the predetermined direction is the depth direction. Also in Fig. 1 the first direction is the height direction and the second direction is the width direction.

[0015] Each of the directional control valves 3b to 7b is connected to each of the pumps 8L, 8R and actuators. The directional control valves 3b-7b control the flow of hydraulic fluid from the pumps 8L, 8R to the actuators. The directional control valves 3b-7b are inserted through each of the block bodies 3a-7a. More specifically, the directional control valves 3b-7b penetrate the block body 3a in the second direction. Each of the two end portions of the directional control valves 3b-7b protrudes in one direction and the other from each of the sides in the second direction in each of the block bodies 3a-7a. The directional control valves 3b-7b in this embodiment are electromagnetic spool valves, for example, having electromagnetic proportional control valves in the protruding portions. <ventilblock>

[0016] The valve block 2, which is an embodiment of the invention, includes the following configurations. That is, the valve block 2 has a block body 11, two check valves 12 and 13, and a pressure relief valve 14, as shown in Fig. 2. The valve block 2 further comprises a directional control valve 15, a solenoid relief valve 16 and a pair of relief valves 17 and 18. Hereinafter, the predetermined direction is the height direction in Fig. 2, the first direction is the depth direction in Fig. 2 and the second direction is the left / right direction in Fig. 2. The valve block 2 is connected to the two pumps 8L, 8R and an actuator 9 (see Fig. 3). More specifically, the valve block 2 is connected to the two pumps 8L, 8R via other valve blocks 3 to 7. In the valve block 2, the hydraulic fluids supplied by the two pumps 8L, 8R flow through the block body 11, respectively. The hydraulic fluids from the two pumps 8L, 8R are then combined in the block body 11. The valve block 2 controls the flow of the combined hydraulic fluid to the actuator 9. In this process, the valve block 2 supplies the hydraulic fluid to the actuator 9 at a flow rate according to the input control signal, regardless of the load. In the following, the hydraulic circuits formed in the valve block 2 will be described first with reference to Fig. 3 described.

[0017] Two inlet ports 21, 22, two reservoir ports 23, 24, and two supply / drain ports 25, 26 are formed in the block body 11. Furthermore, the block body 11 is formed with passages 41-48 and a confluence chamber 31, as described in more detail later, through which the hydraulic fluid flows within the block body 11.

[0018] The first inlet port 21 is connected to one 8R of the two pumps 8L, 8R, and the second inlet port 22 is connected to the other pump 8L. In this embodiment, the two inlet ports 21, 22 are connected to the respective pumps 8L, 8R via passages (not shown) formed in the other valve blocks 3a to 7a. The two reservoir ports 23, 24 are connected to the reservoir 10. In this embodiment, the two reservoir ports 23, 24 are also connected to the reservoir 10 via passages formed in the other valve blocks 3a to 7a. The first and second supply / discharge ports 25, 26 are connected to the ports 9a, 9b of the actuator 9. The actuator 9 is, for example, a hydraulic cylinder 9, and each of the supply / discharge ports 25, 26 is connected to a head-side port 9a and a rod-side port 9b, respectively. However, the actuator 9 can also be a hydraulic motor.Each of the supply / discharge ports 25, 26 can be connected to the rod-side port 9b or the head-side port 9a, respectively.

[0019] In the block body 11, the hydraulic fluid is introduced into the block body 11 from the first and second inlet ports 21, 22. The first and second supply / drain ports 25, 26 supply and drain the hydraulic fluid to / from the hydraulic cylinder 9. That is, the introduced hydraulic fluid flows through the block body 11 and is supplied to the hydraulic cylinder 9 via one of the supply / drain ports 25 and 26. In the hydraulic cylinder 9, the hydraulic fluid is drained from the other of the supply / drain ports 25, 26. The drained hydraulic fluid flows through the block body 11 and is drained into the reservoir 10 via the reservoir ports 23, 24. <Rückschlagventil>

[0020] The first and second check valves 12, 13 are connected to the first and second inlet ports 21, 22, respectively. The first and second check valves 12, 13 are also connected to the confluence chamber 31, which will be described in detail later. The first and second check valves 12, 13 allow one-way flow and block the opposite flow of the hydraulic fluid flowing in the block body 11. More specifically, the first check valve 12 allows one-way flow from the first inlet port 21 to the confluence chamber 31 and blocks the opposite flow. On the other hand, the second check valve 13 allows one-way flow from the second inlet port 22 to the confluence chamber 31 and blocks the opposite flow. As a result, the hydraulic fluid from each inlet port 22 is converged in the confluence chamber 31. <druckausgleichsventil>

[0021] The pressure compensating valve 14 is connected to the confluence chamber 31. In this embodiment, the pressure compensating valve 14 is inserted through the confluence chamber 31. The pressure compensating valve 14 is also connected to the directional control valve 15. The pressure compensating valve 14 compensates the pressure of the hydraulic fluid flowing in the block body 11. More specifically, the pressure compensating valve 14 adjusts its opening so that the differential pressure before and after the directional control valve 15 (i.e., the differential pressure between the upstream pressure and the downstream pressure), which will be described in detail later, is a constant pressure. In this embodiment, the pressure compensating valve 14 receives the upstream pressure and the downstream pressure of the directional control valve 15 in a direction opposite to each other. The pressure compensating valve 14 adjusts its opening according to the differential pressure between the acting upstream and downstream pressures. <richtungssteuerventil>

[0022] The directional control valve 15 is connected to the reservoir port 23 and the two supply / discharge ports 25 and 26, as well as the pressure relief valve 14. The directional control valve 15 controls the flow direction of the hydraulic fluid in the block body 11. The directional control valve 15 is, for example, a solenoid spool valve in which the spool 15c moves in the direction according to the input control signal. This connects the pressure equalizing valve 14 to one of the two supply / drain ports 25 and 26 and the other to one of the tank ports 23 and 24. In this embodiment, the directional control valve 15 connects the first supply / drain port 25 to the first tank port 23 when the first supply / drain port 25 is connected to the tank 10, and connects the second supply / drain port 26 to the second tank port 24 when the second supply / drain port 26 is connected to the tank 10.The directional control valve 15 is, for example, an electric spool valve. The directional control valve 15 moves the spool 15c by a stroke amount according to the input control signal. This adjusts the opening of the directional control valve 15 according to the input control signal.

[0023] In this way, the directional control valve 15 switches the connection point of the pressure relief valve 14 to one of the supply / discharge ports 25 and 26 according to the input control signal. In this way, the directional control valve 15 can supply the hydraulic fluid to the hydraulic cylinder 9 in the direction according to the input control signal. In this way, the hydraulic cylinder 9 extends or retracts in the direction according to the input control signal. The directional control valve 15 also controls the extension / retraction speed of the hydraulic cylinder 9 by adjusting the opening degree according to the input control signal. <magnetentlastungsventil>

[0024] The solenoid relief valve 16 is connected to the pressure relief valve 14 and the reservoir port 23. The solenoid relief valve 16 causes the downstream pressure of the directional control valve 15 acting on the pressure relief valve 14 to be released into the reservoir 10 (in this embodiment, the reservoir port 23). More specifically, the solenoid relief valve 16 causes the downstream pressure of the directional control valve 15 acting on the pressure relief valve 14 to be released into the reservoir 10 via the reservoir port 23 in response to an input relief signal. In this way, the solenoid relief valve 16 forces the pressure relief valve 14 to close. <entlastungsventil>

[0025] The pair of relief valves 17, 18 are connected to supply / drain flow paths 32, 33 that connect the directional control valve 15 to each of the supply / drain ports 25, 26. The pair of relief valves 17, 18 discharge the hydraulic fluid flowing in the block body 11 into the reservoir 10. More specifically, the first relief valve 17 is connected to the first supply / drain flow path 32 that connects the directional control valve 15 and the first supply / drain port 25. The first relief valve 17 connects the first supply / drain flow path 32 to the first reservoir port 23 when the fluid pressure in the first supply / drain flow path 32 exceeds a predetermined pressure. The second relief valve 18 is connected to the second supply / discharge flow path 33, which connects the directional control valve 15 to the second supply / discharge port 26.The second relief valve 18 connects the second supply / discharge flow path 33 to the second tank port 24 when the fluid pressure in the second supply / discharge flow path 33 exceeds a predetermined pressure. <Fluss des Hydraulikfluids im Hydraulikkreislauf des Ventilblocks>

[0026] When a control signal is input to the directional valve 15, the spool 15c in the valve block 2 is moved in the direction corresponding to the control signal. This connects the pressure compensating valve 14 to one of the two ports 25 and 26. For example, the pressure compensating valve 14 is connected to the first supply / discharge port 25, and the second supply / discharge port 26 is connected to the reservoir port 24. In this way, the hydraulic fluid introduced from the two inlet ports 21, 22 flows through the two check valves 12, 13 to the confluence chamber 31. The hydraulic fluid in the confluence chamber 31 is directed from the confluence chamber 31 to the directional control valve 15 via the pressure compensating valve 14. The hydraulic fluid is then supplied from the directional control valve 15 to the hydraulic cylinder 9 via the first supply / discharge port 25. This activates the hydraulic cylinder 9.At this time, the pressure compensating valve 14 maintains the differential pressure before and after the directional control valve 15 at a constant pressure. The directional control valve 15 is controlled to have an opening according to the control signal. Therefore, the hydraulic fluid is supplied to the hydraulic cylinder 9 at a flow rate corresponding to the control signal, regardless of the load acting on the hydraulic cylinder 9. This allows the hydraulic cylinder 9 to move at a speed according to the control signal. <Aufbau des Ventilblocks>

[0027] The structure of the valve block 2 is described below, including the position of each valve 12-18 in the block body 11. The block body 11 comprises first to third side surfaces 11a to 11c, as shown in Fig. 2. The first side surface 11a, which is shown in Fig. 4, faces one side in the first direction. The second side surface 11b, which is shown in Fig. 5, faces one side in the second direction. The third side surface 11c, which is shown in Fig. 6, faces the other side in the second direction. In addition, the block body 11 has a main surface 11d and a back surface 11e. The main surface 11d faces one side in the predetermined direction. The back surface 11e faces the other side in the predetermined direction. In this embodiment, the block body 11 is formed in the shape of a rectangular parallelepiped with a thickness in the predetermined direction and a length in the second direction. The main surface 11d faces the main surface (not shown) of the adjacent valve block 3 in the multiple control valve device 1. Furthermore, in the block body 11, a part of the third side surface 11c on the other side is notched in the first direction. This reduces the weight of the block body 11.

[0028] As in Fig. 7, the first and second inlet ports 21, 22 are formed on the main surface 11d. More specifically, the first and second inlet ports 21, 22 are formed in the main surface 11d at the center in the second direction and spaced from each other in the first direction. In the present embodiment, the first and second inlet ports 21, 22 are arranged in the main surface 11d so as to be closer to the other side in the first direction. Two supply ports (not shown) are formed in the adjacent valve block 3, which are arranged to correspond to each of the two inlet ports 21, 22. Therefore, by arranging the valve block 2 and the valve block 3 adjacent to each other in the predetermined direction, the two inlet ports 21, 22 are connected to the two supply ports. This allows each of the two pumps 8L, 8R to be connected to each of the inlet ports 21, 22.In the block body 11, inlet side passages 41, 42 extend from each of the two inlet ports 21, 22, as shown in . Fig. 8 and Fig. 9. The inlet side passages 41, 42 bend in an L-shape from the inlet ports 21, 22 and then extend to one side in the first direction.

[0029] The first and second tank ports 23, 24 are formed on the main surface 11d. More specifically, the first and second tank ports 23, 24 are arranged on the other side in the first direction and spaced from each other in the second direction on the main surface 11d. Each of the first and second tank ports 23, 24 is arranged on one side and the other side in the second direction, respectively, with respect to the line connecting the two inlet ports 21, 22 in this embodiment. Moreover, the first and second tank ports 23, 24 are arranged to overlap the directional control valve 15 in the predetermined direction in plan view. The two tank ports 23, 24 are also arranged to respectively correspond to two tank connection ports (not shown) formed in the valve block 3.By arranging the valve block 2 and the valve block 3 adjacent to each other in the predetermined direction, the two container ports 23, 24 are connected to the container 10 via the two container connection ports.

[0030] The first supply / discharge port 25 is formed on the second side surface 11b, as shown in Fig. 5. More specifically, the first supply / discharge port 25 is formed on one side in the first direction on the second side surface 11b. The second supply / discharge port 26 is formed on the first side surface 11a. More specifically, the second supply / discharge port 26 is formed on the other side in the second direction on the first side surface 11a. The two supply / discharge ports 25, 26 are each connected to the head-side port 9a and the rod-side port 9b of the hydraulic cylinder 9 via pipes (not shown).

[0031] The confluence chamber 31 is arranged on the side of the first side surface 11a in the block body 11, as shown in Fig. 8 and Fig. 9. The confluence chamber 31 is flattened in this embodiment and arranged parallel to the first side surface 11a. The confluence chamber 31 has an L-shape in cross section when viewed from the other side in the first direction, as shown in Fig. 10. More specifically, the confluence chamber 31 is formed in an L-shape extending in the predetermined direction on the other side and in the second direction on one side. The confluence chamber 31 is located in front of the inlet ports 21, 22 (i.e., on one side in the first direction) in the front view. That is, the confluence chamber 31 is notched on the other side in the predetermined direction, which is on one side in the second direction in the front view. The inlet side passages 41, 42 and the control valve passage 43 are connected to the two end portions 31a, 31b and the bent portion 31c of the confluence chamber 31. In this embodiment, the inlet side passages 41, 42 are connected to each of the bent portions 31c and the end portion 31a on the other side in the predetermined direction of the confluence chamber 31.The control valve passage 43 is connected to the end portion 31b on one side in the second direction. The control valve passage 43 is a passage leading to the directional control valve 15 and extending from the confluence chamber 31 in the other direction in the first direction.

[0032] As in Fig. 4, the two check valves 12, 13 and the pressure compensating valve 14 are inserted from the first side surface 11a in such a way that they are parallel to each other. More specifically, the first check valve 12 is arranged adjacent to the pressure compensating valve 14 in the second direction. The second check valve 13 is arranged adjacent to the first check valve 12 in the predetermined direction. The two check valves 12, 13 and the pressure compensating valve 14 are therefore arranged in an L-shape, as is the confluence chamber 31. The first check valve 12, in this embodiment, is arranged on the other side in the second direction of the pressure compensating valve 14. The second check valve 13, in this embodiment, is arranged on the other side in the predetermined direction of the first check valve 12.

[0033] The two check valves 12, 13 and the pressure relief valve 14 extend from the first side surface 11a to the other side in the first direction. Furthermore, the two check valves 12, 13 and the pressure relief valve 14 are arranged with respect to the confluence chamber 31 as follows. That is, the two check valves 12, 13 and the pressure relief valve 14 are arranged at the two end portions 31a, 31b and the bent portion 31c of the confluence chamber 31, respectively, as shown in Fig. 10. More specifically, the first check valve 12 is inserted through the bent portion 31c of the confluence chamber 31, and the second check valve 13 is inserted through the end portion 31a on the other side of the confluence chamber 31 in the predetermined direction. The pressure relief valve 14 is inserted through the end portion 31b of the confluence chamber 31 on one side in the second direction. The configuration of the two check valves 12, 13 and the pressure relief valve 14 will be described in detail below.

[0034] The two check valves 12, 13 each have valve plugs 12a, 13a, as shown in Fig. 11. The valve plugs 12a, 13a are arranged on the tip side facing away from the first side surface 11a to the other side in the first direction in the two check valves 12, 13. More specifically, the valve plugs 12a, 13a are arranged in the confluence chamber 31, corresponding to the openings of the inlet side passages 41, 42. The valve plugs 12a, 13a close the openings of the inlet side passages 41, 42 by the springs 12b, 13b. The valve plugs 12a, 13a are subjected to the hydraulic pressure of the inlet side passages 41, 42 corresponding to the tips and the hydraulic pressure of the confluence chamber 31 in one direction against each other. In this way, the two check valves 12, 13 allow flow in one direction into the confluence chamber 31 and prevent flow in the opposite direction.

[0035] The pressure compensation valve 14 has a valve plug 14a and a housing 14b, as shown in Fig. 12. The valve plug 14a is inserted from the first side surface 11a and extends to the other side in the first direction. The tip portion of the valve plug 14a penetrates the confluence chamber 31 and is inserted into the control valve passage 43. Thereby, the valve plug 14a closes the control valve passage 43 with the tip portion and is subjected to the upstream pressure of the directional valve 15 at the tip portion. The base portion of the valve plug 14a protrudes from the first side surface 11a. The housing 14b is attached to the first side surface 11a so as to enclose the base portion of the valve plug 14a. The housing 14b may include a spring 14c. In the housing 14b, the downstream pressure of the directional valve 15 is directed thereto via a downstream pressure introduction passage 48, which will be described in detail later, and an internal passage in the valve cone 14a, which is not shown.Therefore, the force of the spring 14c and the downstream pressure on the valve plug 14a act in a direction counter to the upstream pressure of the directional control valve 15. Therefore, the valve plug 14a moves to a position where the upstream pressure, the downstream pressure, and the force of the spring 14c are balanced. The opening of the pressure compensating valve 14 is then adjusted to open according to the front-rear differential pressure of the directional control valve 15, so that the front-rear differential pressure of the directional control valve 15 is set to a constant pressure according to the force exerted by the spring 14c.

[0036] The directional control valve 15 is inserted from the second side surface 11b of the block body 11, as shown in Fig. 8 and Fig. 9. More specifically, the directional control valve 15 penetrates the block body 11 from the second side surface 11b to the third side surface 11c in the second direction. In the present embodiment, the spool 15c penetrates the block body 11 from the second side surface 11b to the third side surface 11c in the second direction. In the directional control valve 15, the spool 15c overlaps the two tank ports 23, 24 in plan view. The directional control valve 15 protrudes from the second side surface 11b in one side in the second direction. Furthermore, the directional control valve 15 protrudes from the third side surface 11c in the other side in the second direction. The directional control valve 15 has proportional solenoid control valves 15a, 15b at the portions protruding from the second side surface 11b and the third side surface 11c.Each of the proportional solenoid control valves 15a, 15b outputs a pilot pressure in response to an input control signal. This causes the spool 15c to move in one direction and the other side to move in the second direction.

[0037] Also connected to the directional control valve 15 are the control valve passage 43, two supply / discharge passages 44, 45, two reservoir passages 46, 47, and a downstream pressure introduction passage 48. The control valve passage 43 is connected to the center part of the directional control valve 15 in the second direction. More specifically, the control valve passage 43 has a connecting portion 43a and an extended portion 43b. The connecting portion 43a connects the pressure relief valve 14 and the directional control valve 15 in the block body 11. The extended portion 43b extends further from the directional control valve 15 in the block body 11 to the other side in the first direction. The extended portion 43b is formed in an inverted U-shape in plan view. That is, the extended portion 43b is folded back toward the directional control valve 15.The extended portion 43b is connected to the directional control valve 15 on the other side in the second direction than the connecting portion 43a. The second inlet port 22 is arranged inside the extended portion 43b in plan view.

[0038] The two supply / discharge passages 44, 45 are each formed in the block body 11 further outward in the second direction of the control valve passage 43. The first supply / discharge passage 44 extends from the directional control valve 15 in one side and the other in the first direction. The first supply / discharge passage 44 is a part of the first supply / discharge path 32 formed in the block body 11 in the first supply / discharge path 32. The first supply / discharge passage 44 bends toward the second side surface 11b on one side in the first direction and is connected to the first supply / discharge port 25. The second supply / discharge passage 45 extends from the directional control valve 15 on one side in the first direction and is connected to the second supply / discharge port 26. The second supply / discharge passage 45 is a part of the second supply / discharge path 33 formed in the block body 11 in the second supply / discharge path 33.

[0039] The two reservoir passages 46, 47 are formed in the block body 11, each further outward in the second direction from the two supply / discharge passages 44 and 45, respectively. The two reservoir passages 46, 47 extend from the directional control valve 15 toward the main surface 11d (i.e., in one direction in the predetermined direction) and are connected to each of the two reservoir ports 23, 24. More specifically, the two reservoir passages 46, 47 overlap each of the reservoir ports 23, 24 in plan view. The first reservoir passage 46 is located on the second side surface 11b of the block body 11 and also extends from the directional control valve 15 in the other direction in the first direction. The second reservoir passage 47 is located on the third side surface 11c of the block body 11 and also extends in one side in the first direction from the directional control valve 15.

[0040] The Fig. The downstream pressure introduction passage 48 shown in FIG. 8 is connected to the central part of the directional control valve 15 in the second direction. The downstream pressure introduction passage 48 is formed on the rear surface 11e side of the directional control valve 15 in the block body 11 and extends in the first direction. Therefore, the downstream pressure introduction passage 48 is formed in the block body 11 so as to overlap with the directional control valve 15 and other passages such as the control valve passage 43 when viewed from behind. To describe the downstream pressure introduction passage 48 in more detail, an annular space 49 is formed in the central part of the directional control valve 15 in the second direction in the block body 11 and around the spool 15c. The annular space 49 is connected to the supply / discharge passages 44, 45 via an internal passage in the slide 15c, which is not shown.As a result, the downstream pressure of the directional control valve 15 is introduced into the annular space 49. The downstream pressure introduction passage 48 extends upward from the annular space 49 toward the rear surface 11e. The downstream pressure introduction passage 48 branches at its upper end in one direction and the other side in the first direction. The downstream pressure introduction passage 48 is connected to the pressure relief valve 14 (in this embodiment, the housing 14b) on one side in the first direction. Therefore, the downstream pressure introduction passage 48 supplies downstream pressure to the pressure relief valve 14. A portion of the downstream pressure introduction passage 48 on one side in the first direction passes through the notched portion of the confluence chamber 31.On the other hand, the downstream pressure introduction passage 48 is inclined to approach the second side surface 11b on the other side in the first direction.

[0041] Each of the proportional solenoid control valves 15a, 15b of the directional control valve 15 is connected to a pressure source passage and a drain passage (not shown) formed in the block body 11, which will not be described in detail. The pressure source passage is connected to a pilot pressure source, such as a pilot pump (not shown), which supplies the pilot pressure source to the proportional solenoid control valves 15a, 15b. The drain passage connects the proportional solenoid control valves 15a, 15b to the drain (i.e., the reservoir 10).

[0042] The solenoid relief valve 16 is mounted on the second side surface 11b, as shown in Fig. 5. More specifically, the solenoid relief valve 16 is arranged on the other side in the first direction than the directional control valve 15 on the second side surface 11b. The solenoid relief valve 16 is also arranged on the other side in the predetermined direction (ie, on the side of the rear surface 11e) on the second side surface 11b. The solenoid relief valve 16 is inserted from the second side surface 11b, as shown in Fig. 8. The solenoid relief valve 16 extends in the second direction to the other side. The solenoid relief valve 16 is connected to the other side portion of the downstream pressure introduction passage 48 in the first direction at the tip. The solenoid relief valve 16 is connected to the tank port 23 via the first tank passage 46 at its middle portion. The solenoid relief valve 16 has a solenoid 16a in a portion protruding from the second side surface 11b on one side in the second direction. When a relief signal is input to the solenoid 16a, the solenoid relief valve 16 moves a valve plug, not shown. This connects the downstream pressure introduction passage 48 to the first tank port 23. This allows the downstream pressure to be the tank pressure.

[0043] The pair of relief valves 17, 18 is mounted on each of the second side surface 11b and the third side surface 11c, as shown in Fig. 5 and 6, respectively. More specifically, the first relief valve 17 is arranged on the other side in the first direction than the directional control valve 15 on the second side surface 11, as shown in Fig. 5. The first relief valve 17 is also arranged on one side in the predetermined direction (ie, on the side of the main surface 11d) on the second side surface 11b. More specifically, the first relief valve 17 is arranged adjacent to the solenoid relief valve 16 on the second side surface 11b. The first relief valve 17 is inserted into the second side surface 11b, as shown in Fig. 9. The first relief valve 17 extends in the second direction on the other side. The first relief valve 17 is connected to the portion of the first supply / discharge passage 44 located on the other side in the first direction. The first relief valve 17 is also connected to the tank port 23 via the first tank passage 46. The first relief valve 17 has a spring, not shown, in the housing 17a, which protrudes from the second side surface 11b on one side in the second direction. In the first relief valve 17, the valve plug 17b, energized by the spring, closes the first supply / discharge passage 44. When the fluid pressure in the first supply / discharge passage 44 reaches or exceeds a predetermined pressure, the valve plug 17b is lifted.This opens the first supply / discharge passage 44, and the first supply / discharge passage 44 is connected to the first tank port 23. This maintains the fluid pressure in the first supply / discharge passage 44 below the predetermined pressure.

[0044] The second relief valve 18 is arranged on the third side surface 11c and on one side in the first direction as the directional control valve 15, as shown in Fig. 6. More specifically, the second relief valve 18 is inserted into the third side surface 11c, as shown in Fig. 9. The second relief valve 18 extends in the second direction on one side. The second relief valve 18 is connected to the second supply / discharge passage 45. The second relief valve 18 is connected to the tank port 23 via the second tank passage 47. The second relief valve 18 has a spring (not shown) in a housing 18a that projects from the third side surface 11c on one side in the second direction. In the second relief valve 18, the valve plug 18b, energized by the spring, closes the second supply / discharge passage 45. When the fluid pressure in the second supply / discharge passage 45 reaches or exceeds a predetermined pressure, the valve plug 18b is lifted. This opens the first supply / discharge passage 44, and the second supply / discharge passage 45 is connected to the second tank port 24.This keeps the fluid pressure in the second supply / discharge passage 45 below the predetermined pressure.

[0045] In the valve block 2 of the present embodiment, the first check valve 12, the second check valve 13, and the pressure relief valve 14 are inserted parallel to each other from the first side surface 11a of the block body 11. Therefore, the block body 11 can be made compact in the predetermined direction. Furthermore, the first check valve 12, the second check valve 13, and the pressure relief valve 14 are prevented from interfering with the valve block 3 located adjacent thereto in the predetermined direction.

[0046] In the valve block 2 of the present embodiment, the first check valve 12, the second check valve 13, and the pressure relief valve 14 are arranged side by side on the first side surface 11a. Therefore, the first check valve 12, the second check valve 13, and the pressure relief valve 14 can be arranged compactly on the first side surface 11a.

[0047] Furthermore, in the valve block 2 of the present embodiment, the first inlet port 21 and the second inlet port 22 are formed on the main surface 11d. Therefore, the two inlet ports 21, 22 are arranged to face the adjacent valve block 3. The inlet ports 21, 22 and ports of the adjacent valve block 3 can be easily connected by shaping the ports of the adjacent valve block 3 to correspond to the two inlet ports 21, 22, respectively. This does not require separate piping or the like to connect the two inlet ports 21, 22 to said ports, thereby reducing the number of parts of the valve block 2.

[0048] Furthermore, in the valve block 2 of the present embodiment, the directional control valve 15 is inserted from the second side surface 11b, which is different from the first side surface 11a. Therefore, the large area of ​​the first side surface 11a can be used for valve arrangement, which improves the degree of freedom in the arrangement of the first check valve 12, the second check valve 13, and the pressure relief valve 14. In addition, the degree of freedom of the passages 41, 42, 43 leading to the first check valve 12, the second check valve 13, and the pressure relief valve 14 can also be improved.

[0049] Furthermore, in the valve block 2 of the present embodiment, the tank ports 23, 24 are formed on the main surface 11d. Therefore, the tank ports 23 and 24 can be connected to the tank 10 via tank passages (not shown) formed in the adjacent valve block 3. This eliminates the need to directly connect the tank ports 23, 24 to the tank 10 via piping. This reduces the number of parts in the valve block 2.

[0050] Furthermore, in the valve block 2 of the present embodiment, the first supply / discharge port 25 is formed on the second side surface 11b, and the second supply / discharge port 26 is formed on the first side surface 11a. Therefore, the degree of freedom in designing the piping connected to each of the two supply / discharge ports 25, 26 can be improved.

[0051] Furthermore, in the valve block 2 of the present embodiment, the solenoid relief valve 16 is mounted on the second side surface 11b from which the directional control valve 15 protrudes. Therefore, by reducing the extension length of the solenoid relief valve 16 protruding from the second side 11b, the length of the valve block 2 in the second direction can be reduced.

[0052] Furthermore, in the valve block 2 of the present embodiment, each of the pair of relief valves 17, 18 is mounted on the second side surface 11b, from which the directional control valve 15 protrudes, and on the third side surface 11c, respectively. Therefore, by reducing the extension lengths of the pair of relief valves 17, 18 protruding from the second side surface 11b and the third side surface 11c, respectively, the length of the valve block 2 in the second direction can be reduced.

[0053] Furthermore, in the valve block 2 of this embodiment, the first relief valve 17 and the solenoid relief valve 16 are arranged on the second side surface 11b, and the second relief valve 18 is arranged on the third side surface 11c on one side in the first direction. Therefore, no valve can be arranged in the portion of the second side surface 11b located on the other side in the first direction. This allows the said portion of the second side surface 11b located on the other side in the first direction to be notched, thereby reducing the weight of the block body 11.

[0054] Furthermore, in the valve block 2 of the present embodiment, the two check valves 12, 13 are connected to the confluence chamber 31 and allow the flow of hydraulic fluid in one direction into the confluence chamber 31. Therefore, the hydraulic fluid flowing to each of the two check valves 12, 13 converges in the confluence chamber 31 and then flows to the pressure relief valve 14. This can suppress the pressure loss when the hydraulic fluid from each of the two check valves 12, 13 converges through the confluence chamber 31. In addition, when casting the valve block 2, the confluence chamber is easier to form than in the case of a connecting path.

[0055] Furthermore, in the valve block 2 of the present embodiment, the first check valve 12, the second check valve 13, and the pressure relief valve 14 extend in the predetermined direction and are arranged in both end portions 31a, 31b and the bent portion 31c of the L-shaped confluence chamber 31 in cross section. Therefore, the first check valve 12, the second check valve 13, and the pressure relief valve 14 are arranged compactly, and the confluence chamber 31 is formed compactly.

[0056] The multiple control valve device 1 of the present embodiment can be used to realize a multiple control valve device 1 having the functions described above. <Andere Ausführungsformen>

[0057] The valve block 2 does not necessarily have to include all six valves 12-18, including the two check valves 12, 13 and the pressure relief valve 14. That is, the valve block 2 only needs to include at least two check valves 12, 13 and the pressure relief valve 14. The valve block 2 is also not limited to the above-mentioned arrangement of the solenoid relief valve 16 and the pair of relief valves 17 and 18. Furthermore, the valve block 2 does not necessarily have to include the confluence chamber 31. That is, the two check valves 12, 13 can be connected by flow paths. Furthermore, the positions of the ports 21 to 26 in the valve block 2 are also not limited to the above-mentioned positions.In the valve block 2, various ports 54-56 may be formed on the rear surface 11e, which connect to the respective ports of the other valve block to position the other valve block on the other side in the predetermined direction (see . Fig. 13).

[0058] From the above description, many improvements and other embodiments of the invention will be apparent to those skilled in the art. The above description should therefore be considered only as an example and is provided for the purpose of teaching those skilled in the art the best way to practice the invention. The details of its structure and / or function may be changed substantially without departing from the spirit of the invention. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2021092227(A

[0003] < / entlastungsventil> < / magnetentlastungsventil> < / richtungssteuerventil> < / druckausgleichsventil> < / ventilblock> < / mehrfachsteuerventilvorrichtung>

Claims

[1] A valve block for a multiple control valve device in which a plurality of valve blocks are arranged in a predetermined direction, comprising: a block body; first and second check valves that allow the flow of hydraulic fluid through the block body in one direction and prevent the flow of hydraulic fluid in the opposite direction; and a pressure compensation valve configured to equalize the pressure of the hydraulic fluid flowing in the block body, wherein the block body comprises a first side surface facing a direction in a first direction orthogonal to the predetermined direction, and wherein the first check valve, the second check valve and the pressure compensating valve are inserted from the first side surface of the block body such that they are parallel to each other. [2] The valve block according to claim 1, wherein the first check valve is disposed adjacent to the pressure compensating valve in a second direction orthogonal to the predetermined direction and intersecting the first direction, the second check valve being disposed adjacent to the first check valve in the predetermined direction. [3] The valve block according to claim 1 or 2, wherein the block body further comprises a main surface facing a direction in the predetermined direction, a first inlet port leading to the first check valve, and a second inlet port leading to the second check valve, the first inlet port and the second inlet port being formed on the main surface of the block body. [4] Valve block according to claim 1 or 2, further comprising a directional control valve configured to control the flow direction of the hydraulic fluid flowing through the block body, wherein the block body further comprises a second side surface facing a side in the second direction orthogonal to the predetermined direction and intersecting the first direction, wherein the directional control valve is inserted from the second side surface of the block body. [5] The valve block according to claim 4, wherein the block body further comprises a main surface facing a direction in the predetermined direction and a reservoir port leading to the directional control valve, the reservoir port being formed on the main surface of the block body. [6] A valve block according to claim 4 or 5, wherein the block body further comprises a third side surface facing the other direction in the second direction, and first and second supply / discharge ports leading to the directional control valve, the first supply / discharge port is formed on the second side surface and the second supply / discharge port is formed on the first side surface. [7] A valve block according to any one of claims 4 to 6, further comprising a solenoid relief valve for releasing a downstream pressure consisting of upstream and downstream pressures of the directional control valve acting on the pressure equalizing valve to the container, the directional control valve protruding from the second side surface in one side in the second direction, the solenoid relief valve being attached to the second side surface of the block body. [8] A valve block according to any one of claims 4 to 7, further comprising a pair of relief valves that discharge the hydraulic fluid flowing in the block body, the block body comprising a third side surface facing the other direction in the second direction, the directional control valve penetrates from the second side surface to the third side surface and protrudes from the second and third side surfaces in one side and the other side in the second direction, each of the pair of relief valves is mounted on each of the second and third side surfaces. [9] Valve block according to claim 8, further comprising a solenoid relief valve for connecting the downstream pressure resulting from the upstream and downstream pressures of the directional control valve acting on the pressure equalizing valve to the container, wherein a first relief valve, one of the pair of relief valves, is arranged on the second side surface and on one side in the first direction as the directional control valve, wherein a second relief valve, the other of the pair of relief valves, is arranged on the third side surface and on the other side in the first direction than the directional control valve, and wherein the solenoid relief valve is arranged on the second side surface of the block body and on the other side in the first direction than the directional control valve. [10] Valve block according to one of claims 1 to 9, wherein the block body further comprises a confluence chamber into which the pressure compensating valve is inserted, wherein the first check valve and the second check valve are connected to the confluence chamber and allow a unidirectional flow of hydraulic fluid into the confluence chamber. [11] The valve block according to claim 10, wherein the confluence chamber is L-shaped in cross section when viewed from one side in the first direction, the first check valve, the second check valve and the pressure compensating valve extending in the other side in the first direction and being respectively arranged at both end portions and a bent portion of the confluence chamber. [12] A multiple control valve device comprising a plurality of valve blocks, including a valve block according to any one of claims 1 to 11, wherein the plurality of valve blocks are arranged adjacent to each other in the predetermined direction.

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