JP2020133692A - Multi-control valve unit and construction machine - Google Patents

Abstract

To provide a multi-control valve unit and a construction machine with a simple configuration.SOLUTION: A multi-control valve unit includes a plurality of first pilot chambers, a plurality of second pilot chambers, a pressure oil flow passage formed in a first pilot chamber forming member so that pressure oil supplied to each of the first pilot chambers and each of the second pilot chambers flows therethrough, a plurality of first proportional valves for adjusting pressure oil supplied from the pressure oil flow passage to each of the first pilot chambers, a plurality of second proportional valves for adjusting pressure oil supplied from the pressure oil flow passage to each of the second pilot chambers, a plurality of first pilot flow passages through which the pressure oil flows between each of the first proportional valves and each of the first pilot chambers, and a plurality of second pilot flow passages through which the pressure oil flows between each of the second proportional valves and each of the second pilot chambers.SELECTED DRAWING: Figure 5

Description

The present invention relates to a multi-control valve unit having a plurality of control valves and a construction machine.

Conventionally, there is a type of control valve provided with a valve for controlling the supply and shutoff of the pressure oil in order to selectively supply the pressure oil to each pilot chamber. Patent Document 1 proposes a valve of a type in which a valve for controlling the supply and shutoff of a working fluid to the pilot chamber is provided only on one side of the control valve.

Japanese Unexamined Patent Publication No. 2004-89441

However, in the valve proposed in Patent Document 1, only a structure of only a single control valve is proposed. Therefore, when the control valve described in Patent Document 1 is adopted in a multi-control valve unit having a plurality of control valves, the configuration of the flow path of the pressure oil provided for each control valve is not disclosed. .. If the pressure oil flow path provided for each control valve is randomly configured, the configuration of the multi-control valve unit having a plurality of control valves may be increased.

Therefore, in view of the above circumstances, an object of the present invention is to provide a multi-control valve unit and a construction machine having a simple configuration.

The multi-control valve unit of the present invention is arranged in a housing provided with a plurality of valve chambers inside and axially movable inside each of the plurality of valve chambers, and moves axially inside the valve chambers. A plurality of spools for switching the connection state between the plurality of ports and adjusting the area of the communication portion communicating between the plurality of ports, and a first pilot pressure on one side of each of the plurality of spools. A plurality of first pilot chambers for guiding the first pilot pressure to the pressure receiving portion, and a plurality of second pilots for guiding the second pilot pressure to the second pilot pressure receiving portion on the other side of each of the plurality of spools. The housing so as to individually cover the chamber, the first pilot chamber forming member arranged on one side of the housing so as to cover the plurality of first pilot chambers, and the plurality of second pilot chambers. A plurality of second pilot chamber forming members, which are arranged on the other side opposite to the one side and house the spring for urging the spool to the neutral position, and the first pilot chamber forming member. A plurality of first proportional valves and a plurality of second proportional valves provided, and a plurality of first proportional valves provided in the first pilot chamber forming member and connected to each of the plurality of first proportional valves and each of the plurality of second proportional valves. The pressure oil flow path, the plurality of first pilot flow paths connecting the plurality of first proportional valves and the plurality of first pilot chambers, the plurality of second proportional valves, and the plurality of second pilot chambers. It has a plurality of second pilot flow paths that connect to each of the pilot chambers.

In the multi-control valve unit having the above configuration, the first pilot chamber forming member is formed with a pressure oil flow path for circulating the pressure oil supplied to each of the plurality of first pilot chambers and each of the plurality of second pilot chambers. Therefore, the pressure oil can be supplied from the common pressure oil flow path for the plurality of spools to the first pilot chamber and the second pilot chamber for each spool. Therefore, the configuration of the pressure oil flow path in the multi-control valve unit can be simplified, and the configuration of the multi-control valve unit can be simplified.

Further, the plurality of valve chambers are arranged in a first direction orthogonal to the axial direction of the spool, and the pressure oil flow path is formed inside the first pilot chamber forming member so as to extend in the first direction. It may have been done.

Since the pressure oil flow path is formed so as to extend in the same direction as the direction in which a plurality of valve chambers are arranged, the configuration of the pressure oil flow path can be simplified and the configuration of the multi-control valve unit can be further improved. It can be simplified.

Further, a plurality of valve chamber rows in which the plurality of valve chambers are arranged in the first direction are arranged in a second direction intersecting the first direction, and the pressure oil flow path is provided in each of the valve chamber rows. The pressure oil flow paths provided and provided for each of the valve chamber rows may communicate with each other.

Since the pressure oil flow paths provided in each valve chamber row communicate with each other, the number of pressure oil flow paths can be reduced. Therefore, the configuration of the multi-control valve unit can be simplified.

Further, the first pilot chamber forming member is connected to each of the plurality of first proportional valves and each of the plurality of second proportional valves, and the plurality of first pilot chambers and the plurality of second pilot chambers are connected. A drain flow path may be provided to guide the pressure oil discharged from the tank to the tank.

Since the drain flow path for guiding the pressure oil discharged from the first pilot chamber and the pressure oil discharged from the second pilot chamber to the tank is provided for the plurality of valve chambers, the drain common to the plurality of valve chambers is provided. Pressure oil can be guided from the flow path to the tank. Therefore, the configuration of the drain flow path in the multi-control valve unit can be simplified, and the configuration of the multi-control valve unit can be simplified.

Further, the plurality of valve chambers are arranged in a first direction orthogonal to the axial direction of the spool, and the drain flow path is formed inside the first pilot chamber forming member so as to extend in the first direction. You may be.

Since the drain flow path is formed so as to extend in the same direction as the direction in which the plurality of valve chambers are arranged, the configuration of the drain flow path can be simplified and the configuration of the multi-control valve unit can be simplified. can do.

Further, a plurality of valve chamber rows in which the plurality of valve chambers are arranged in the first direction are arranged in a second direction intersecting the first direction, and the drain flow path is provided in each of the valve chamber rows. The drain flow paths provided for each of the valve chamber rows may communicate with each other.

Since the drain flow paths provided in each valve chamber row communicate with each other, the number of drain flow paths can be reduced. Therefore, the configuration of the multi-control valve unit can be simplified.

Further, the construction machine of the present invention is a construction machine that controls the drive of the actuator by using the above-mentioned multi-control valve unit, and the multi-control valve unit is such that one side thereof is located downward in the direction of gravity. It is located behind the cabin.

Since the construction machine having the above configuration is equipped with a multi-control valve unit having a simplified configuration, the configuration of the construction machine can be simplified accordingly.

According to the present invention, the configuration of the multi-control valve unit can be simplified, so that the multi-control valve unit can be miniaturized.

It is a circuit diagram of the hydraulic excavator hydraulic drive device in which the drive of an actuator is controlled by the multi-control valve unit according to the embodiment of the present invention. It is a circuit diagram which showed more detail about the peripheral part of the structure of the pressure oil flow path in the circuit diagram of FIG. In the circuit diagram of FIG. 2, it is a circuit diagram which showed more detail about one control valve among a plurality of control valves. It is a perspective view of the multi-control valve unit used in the hydraulic drive system for a hydraulic excavator of FIG. (A) is a cross-sectional view of the multi-control valve unit of FIG. 4 as viewed from the side, and (b) is a cross-sectional view of the multi-control valve unit of FIG. 4 as viewed from the front. FIG. 6 is a cross-sectional view of the multi-control valve unit as viewed from the front with respect to a portion of the multi-control valve unit of FIG. 4 in which pressure oil flow paths provided on the respective covers communicate with each other. It is sectional drawing which looked at the side view about the modification of the multi-control valve unit of FIG. It is a schematic side view about the hydraulic excavator when the multi-control valve unit of FIG. 1 is mounted on a hydraulic excavator.

Hereinafter, the multi-control valve unit and the construction machine in which the multi-control valve unit according to the embodiment of the present invention will be described with reference to the accompanying drawings. In this embodiment, a hydraulic excavator is used as a construction machine. Therefore, the multi-control valve unit is used as a drive device for a hydraulic excavator that controls the drive of an actuator in the hydraulic excavator.

FIG. 1 shows a circuit diagram of the hydraulic excavator hydraulic drive device of the present embodiment. In the hydraulic excavator hydraulic drive device 2000 of the present embodiment, two hydraulic pumps 200a and 200b are used to supply pressure oil for controlling the drive of the actuator toward each control valve. Further, the hydraulic drive system 2000 for a hydraulic excavator includes a tank 300. The hydraulic pumps 200a and 200b may be swash plate pumps or swash shaft pumps. In the present embodiment, in the hydraulic excavator hydraulic drive device 2000, two hydraulic pumps 200a and 200b are used to supply pressure oil for controlling the drive of various actuators to each control valve. However, the present invention is not limited to this. In the hydraulic excavator hydraulic drive device 2000, the number of hydraulic pumps for driving the actuator does not have to be two. For example, three or more hydraulic pumps may be used, or only one hydraulic pump may be used.

The hydraulic drive system 2000 for a hydraulic excavator includes a plurality of control valves. The plurality of control valves are arranged side by side in two rows. That is, of the two hydraulic pumps 200a and 200b, a row of control valves arranged along the direction in which pressure oil is supplied from one hydraulic pump 200a and a direction in which pressure oil is supplied from the other hydraulic pump 200b. It is arranged in two rows with a row of control valves arranged along. The rows of each control valve are arranged so that the axial directions of the spools are parallel. In the present embodiment, the hydraulic excavator hydraulic drive device 2000 in which the control valves are arranged in two rows is described, but the present invention is not limited to this. The control valves do not have to be in two rows. For example, the control valves may be arranged in three rows, or the control valves may be arranged in one row.

On the hydraulic pump 200a side, in order from the one closest to the hydraulic pump 200a, a control valve 510 for driving the bucket, a control valve 520 for driving the arm, a control valve 530 for driving the boom, and one of the cuffs are provided. A control valve 540 for driving is provided. However, the order of these control valves can be changed.

Further, on the hydraulic pump 200b side, a control valve 550 for driving the swivel motor, a control valve 560 for driving the arm, a control valve 570 for driving the boom, and the other are in order from the side closest to the hydraulic pump 200b. A control valve 580 for driving the foot belt is provided. However, the order of these control valves can be changed.

In the present embodiment, the supply lines 310 and 320, which are the flow paths of the pressure oil supplied from the hydraulic pumps 200a and 200b, are branched at the positions of the control valves, and the branched flow paths of the pressure oil are branched to the ports of the control valves. Is connected to. As a result, pressure oil from the hydraulic pumps 200a and 200b is supplied to each control valve.

The hydraulic excavator hydraulic drive device 2000 of the present embodiment includes a bucket cylinder 610 for controlling the drive of the bucket in the hydraulic excavator as a hydraulic actuator. The bucket cylinder 610 is supplied with pressure oil to either the head side or the rod side of the bucket cylinder 610, and the flow rate of the pressure oil discharged from the other is adjusted, and the supply / discharge directions are adjusted. A control valve 510 for switching is connected.

Further, the hydraulic drive system 2000 for a hydraulic excavator includes an arm cylinder 620 for controlling the drive of the operation of the arm in the hydraulic excavator. The arm cylinder 620 is connected to control valves 520 and 560 that supply pressure oil to either the head side or the rod side of the arm cylinder 620 and adjust the flow rate of the pressure oil discharged from the other. ing. The arm cylinder 620 causes the arm to perform a pushing operation and a pulling operation. By controlling the drive of the arm cylinder 620, the operation of the arm can be controlled.

Further, the hydraulic drive system 2000 for a hydraulic excavator includes a boom cylinder 630 that controls the drive of the boom operation in the hydraulic excavator. The boom cylinder 630 is connected to control valves 530 and 570 that supply pressure oil to either the head side or the rod side of the boom cylinder 630 and adjust the flow rate of the pressure oil discharged from the other. ing. The boom cylinder 630 executes a boom raising operation and a boom lowering operation. By controlling the drive of the boom cylinder 630, the operation of the boom can be controlled.

Further, the hydraulic drive system 2000 for a hydraulic excavator includes a hydraulic motor 640 that controls the drive of one track in the hydraulic excavator. A control valve 540 that adjusts the flow rate of the pressure oil supplied to and discharged from the hydraulic motor 640 is connected to the hydraulic motor 640.

Further, the hydraulic drive system 2000 for a hydraulic excavator includes a hydraulic motor 650 that drives a swivel body in the hydraulic excavator. A control valve 550 that adjusts the flow rate of the pressure oil supplied to and discharged from the hydraulic motor 650 is connected to the hydraulic motor 650.

Further, the hydraulic drive system 2000 for a hydraulic excavator includes a hydraulic motor 660 that controls the drive of the other track on the hydraulic excavator. A control valve 580 for adjusting the flow rate of pressure oil supplied to and discharged from each pilot chamber of the hydraulic motor 660 is connected to the hydraulic motor 660.

The control valve 510 is configured such that the flow path from the control valve 510 is connected to the bucket cylinder 610. The spool slides inside the valve chamber of the control valve 510 to control the supply and discharge of hydraulic oil to the bucket cylinder 610. In this embodiment, the spool moves axially inside the valve chamber in response to the pilot pressure supplied to the pilot chamber. The spool has a pilot pressure receiving unit (first pilot pressure receiving unit) that receives pilot pressure on one side, and a pilot pressure receiving unit (second pilot pressure receiving unit) that receives pilot pressure on the other side. )have. Two pilot chambers are formed for one control valve, and the spool moves in the two pilot chambers according to the pressure difference of the pilot pressure acting on the respective pilot pressure receiving portions. Specifically, the spool inside the control valve 510 moves to a position where the thrust corresponding to the pilot pressure and the restoring force of the spring 517 (FIGS. 5A and 5B) are balanced. The control valve 510 communicates one port on the head side and the rod side of the bucket cylinder 610 with the pump port with an opening area according to the amount of movement of the spool. In this way, the hydraulic oil is supplied to one of the head side and the rod side of the bucket cylinder 610 at an appropriate flow rate. At the same time, the other port on the head side and rod side of the bucket cylinder 610 and the drain port of the tank passage are communicated with each other with an opening area determined according to the stroke of the spool, and hydraulic oil is discharged to the tank 300 through the drain line 350a. Cylinder.

Further, the control valve 520 is configured such that the flow path from the control valve 520 is connected to the arm cylinder 620. The spool slides inside the valve chamber of the control valve 520 to control the supply and discharge of hydraulic oil to the arm cylinder 620. Similar to the control valve 510, in the control valve 520, the spool moves axially inside the valve chamber in response to the pilot pressure supplied to the pilot chamber. Specifically, the control valve 520 moves to a position where the thrust corresponding to the pilot pressure and the restoring force of the spring 527 (FIG. 5A) are balanced. The control valve 520 communicates hydraulic oil between one port on the head side and rod side of the arm cylinder 620 and the pump port with an opening area according to the amount of movement of the spool. In this way, the hydraulic oil is supplied to one of the head side and the rod side of the arm cylinder 620 at an appropriate flow rate. As a result, the control valve 520 switches the connection state between the plurality of ports. Further, the other port on the head side and the rod side of the arm cylinder 620 and the drain port of the tank passage are communicated with each other in an opening area determined according to the stroke of the spool, and hydraulic oil is discharged. That is, the control valve 520 switches the connection state between the plurality of ports so that the hydraulic oil in the arm cylinder 620 flows toward the tank 300, and the hydraulic oil is discharged to the tank 300 through the drain line 350a.

Further, the control valve 530 is configured such that the flow path from the control valve 530 is connected to the boom cylinder 630. The spool slides inside the valve chamber of the control valve 530 to control the supply and discharge of hydraulic oil to the boom cylinder 630. Similar to the control valves 510 and 520, in the control valve 530, the spool moves axially inside the valve chamber according to the pilot pressure supplied to the pilot chamber. Specifically, the control valve 530 moves to a position where the thrust corresponding to the pilot pressure and the restoring force of the spring 537 (FIG. 5A) are balanced. The control valve 530 communicates the hydraulic oil between one port on the head side and the rod side of the boom cylinder 630 and the pump port with an opening area according to the amount of movement of the spool. In this way, the hydraulic oil is supplied to one of the ports on the head side and the rod side of the boom cylinder 630 at an appropriate flow rate. In this way, the control valve 530 switches the connection state between the plurality of ports. At the same time, the other port on the head side and rod side of the boom cylinder 630 and the drain port of the tank passage are communicated with each other with an opening area determined according to the stroke of the spool, and hydraulic oil is discharged from the boom cylinder 630. The control valve 530 switches the connection state between the plurality of ports so that the hydraulic oil in the boom cylinder 630 flows toward the tank 300, and discharges the hydraulic oil to the tank 300 through the drain line 350a.

The control valve 540 is configured such that the flow path from the control valve 540 is connected to the hydraulic motor 640. The spool slides inside the valve chamber of the control valve 540 to control the drive of the hydraulic motor 640 that drives one of the tracks. In this embodiment, the spool moves axially inside the valve chamber in response to the pilot pressure supplied to the pilot chamber. Specifically, the control valve moves to a position where the thrust corresponding to the pilot pressure and the restoring force of the spring 547 (FIG. 5A) are balanced. One of the ports of the hydraulic motor 640 and the pump port are communicated by the control valve 540 with an opening area according to the amount of movement of the spool. In this way, hydraulic oil is supplied to one port of the hydraulic motor at an appropriate flow rate. At the same time, the other port of the hydraulic motor 640 and the drain port of the tank passage are communicated with each other with an opening area determined according to the stroke of the spool, and the hydraulic oil is discharged toward the tank 300 through the drain line 350a.

The control valve 550 is configured so that the flow path from the control valve 550 is connected to the hydraulic motor 650 for turning the swivel body and controls the drive of the hydraulic motor 650. The spool slides inside the valve chamber of the control valve 550 to control the drive of the hydraulic motor 650. The spool moves axially inside the valve chamber in response to the pilot pressure supplied to the pilot chamber. Specifically, the control valve moves to a position where the thrust corresponding to the pilot pressure and the restoring force of the spring 557 (FIG. 5B) are balanced. One of the ports of the hydraulic motor 650 and the pump port are communicated by the control valve 550 with an opening area according to the amount of movement of the spool. In this way, hydraulic oil is supplied to one port of the hydraulic motor at an appropriate flow rate. At the same time, the other port of the hydraulic motor 650 and the drain port of the tank passage are communicated with each other with an opening area determined according to the stroke of the spool, and the hydraulic oil is discharged toward the tank 300 through the drain line 350b.

The control valve 560 is configured such that the flow path from the control valve 560 is connected to the arm cylinder 620. The spool slides inside the valve chamber of the control valve 560 to control the supply and discharge of hydraulic oil to the arm cylinder 620. In this embodiment, the spool moves axially inside the valve chamber in response to the pilot pressure supplied to the pilot chamber. Specifically, the spool inside the control valve 560 moves to a position where the thrust corresponding to the pilot pressure and the restoring force of the spring 567 (FIG. 5B) are balanced. The control valve 560 communicates one port on the head side and the rod side of the arm cylinder 620 with the pump port with an opening area according to the amount of movement of the spool. In this way, the hydraulic oil is supplied to one of the head side and the rod side of the arm cylinder 620 at an appropriate flow rate. At the same time, the other port on the head side and rod side of the arm cylinder 620 and the port of the tank passage are communicated with each other with an opening area determined according to the stroke of the spool, and the hydraulic oil is discharged to the tank 300 through the drain line 350b. ..

The control valve 570 is configured such that the flow path from the control valve 570 is connected to the boom cylinder 630. The spool slides inside the valve chamber of the control valve 570 to control the supply of hydraulic oil to the boom cylinder 630. In this embodiment, the spool moves axially inside the valve chamber in response to the pilot pressure supplied to the pilot chamber. Specifically, the spool inside the control valve 570 moves to a position where the thrust corresponding to the pilot pressure and the restoring force of the spring 574 (FIGS. 2 and 5 (b)) are balanced. The control valve 570 communicates the head-side port of the boom cylinder 630 with the pump port with an opening area corresponding to the amount of movement of the spool. In this way, the hydraulic oil is supplied to the head side of the boom cylinder 630 at an appropriate flow rate. In the present embodiment, the control valve 570 is not formed with a flow path connected to the tank 300. Therefore, the pressure oil cannot be discharged from the boom cylinder 630 through the control valve 570. The pressure oil is discharged from the boom cylinder 630 only through the control valve 530. Therefore, the control valve 570 can be driven for the boom raising operation and is not involved in the driving during the boom lowering operation. When the hydraulic oil is supplied to the boom cylinder 630 by the control valve 570, the control valve 570 switches the connection state between the ports so that the hydraulic oil is supplied to the boom cylinder 630 at an appropriate flow rate. However, a control valve connected to the tank may be used instead so that the pressure oil can be discharged from the boom cylinder through the control valve. As a result, a control valve adapted to the lowering operation of the boom may be used instead of the control valve 570. That is, instead of the control valve 570, a control valve of the same type as the control valve 530 may be applied.

The control valve 580 is configured by connecting the flow path from the control valve 580 to the hydraulic motor 660. The spool slides inside the valve chamber of the control valve 580 to switch the drive of the hydraulic motor 660 that drives the other track. The spool moves axially inside the valve chamber in response to the pilot pressure supplied to the pilot chamber. Specifically, the control valve moves to a position where the thrust corresponding to the pilot pressure and the restoring force of the spring 587 (FIG. 5B) are balanced. One of the ports of the hydraulic motor 660 and the pump port are communicated by the control valve 580 with an opening area according to the amount of movement of the spool. In this way, hydraulic oil is supplied to one port of the hydraulic motor at an appropriate flow rate. At the same time, the other port of the hydraulic motor 660 and the drain port of the tank passage are communicated with each other with an opening area determined according to the stroke of the spool, and the hydraulic oil is discharged toward the tank 300 through the drain line 350b.

As described above, each control valve comprises a valve chamber and a spool that is slidable within the valve chamber. The spool is configured to be axially movable inside the valve chamber in response to pilot pressure. By moving the spool in each control valve, the connection destination between the ports communicating in the control valve is switched, and the opening area of the communicating portion is also adjusted to switch the drive of each hydraulic actuator.

FIG. 2 shows a circuit diagram of a hydraulic system in the control valves 510 to 580 shown in FIG. 1 showing a flow path of pressure oil for supplying pressure oil to a pilot chamber when moving a spool.

As shown in FIG. 2, the hydraulic excavator hydraulic drive device 2000 is provided with a pressure oil flow path 330 communicating with each of the control valves 510 to 580. That is, the pressure oil flow path 330 communicates with each of the pilot chambers of the plurality of control valves 510 to 580. Two pilot chambers are provided for each of the control valves 510 to 580. Of the pressure oil flow paths 330, the pressure oil flow path 330a connected to the control valves 510 to 540 and the pressure oil flow path 330b connected to the control valves 550 to 580 communicate with each other. A hydraulic pump 200c is connected to one end of the pressure oil flow path 330. By driving the hydraulic pump 200c, pressure oil is supplied into the pressure oil flow path 330.

Further, the hydraulic excavator hydraulic drive device 2000 is provided with a drain flow path 360 that communicates with each of the control valves 510 to 580. That is, the drain flow path 360 communicates with each of the pilot chambers of the plurality of control valves 510 to 580. Two pilot chambers are provided for each of the control valves 510 to 580. Of the drain flow paths 360, the drain flow paths 360a connected to the control valves 510 to 540 and the drain flow paths 360b connected to the control valves 550 to 580 communicate with each other. A tank 300a is connected to the other end of the drain flow path 360 on the side opposite to the one on the side where the hydraulic pump 200c is arranged. The drain flow path 360 guides the pressure oil discharged from each of the plurality of pilot chambers (first pilot chamber) and the pressure oil discharged from each of the plurality of pilot chambers (second pilot chamber) to the tank 300a. Distribute pressure oil.

The control valve 510 includes a pilot chamber (first pilot chamber) 511 and a pilot chamber (second pilot chamber) 512. A branch flow path 331 branched from the pressure oil flow path 330a is formed between the pressure oil flow path 330a and the pilot chamber 511 toward the pilot chamber 511. Further, a branch flow path 361 branched from the drain flow path 360a is formed between the drain flow path 360a and the pilot chamber 511 toward the pilot chamber 511. The control valve 510 is connected to both the branch flow path 331 and the branch flow path 361, and is also connected to the flow path 511a communicating with the pilot chamber 511, and discharges the pressure oil supplied to the pilot chamber 511 and the pilot chamber 511. It has an electromagnetic proportional valve (first proportional valve) 513 that controls the pressure oil to be pressed. The electromagnetic proportional valve 513 controls the pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 511 via the branch flow path 331 and the flow path 511a (first pilot flow path). Further, the pressure oil discharged from the pilot chamber 511 to the drain flow path 360a via the flow path 511a and the branch flow path 361 is controlled.

A branch flow path 332 branched from the pressure oil flow path 330a is formed between the pressure oil flow path 330a and the pilot chamber 512 toward the pilot chamber 511. Further, a branch flow path 362 branched from the drain flow path 360a is formed between the drain flow path 360a and the pilot chamber 512 toward the pilot chamber 512. The control valve 510 is connected to both the branch flow path 332 and the branch flow path 362, is connected to the flow path 512a communicating with the pilot chamber 512, and discharges the pressure oil supplied to the pilot chamber 512 and the pilot chamber 512. It has an electromagnetic proportional valve (second proportional valve) 514 that controls the pressure oil to be pressed. The electromagnetic proportional valve 514 controls the pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 512 via the branch flow path 332 and the flow path 512a (second pilot flow path). Further, the pressure oil discharged from the pilot chamber 512 to the drain flow path 360a via the flow path 512a and the branch flow path 362 is controlled.

Further, similarly to the control valve 510, the control valve 520 includes a pilot chamber (first pilot chamber) 521 and a pilot chamber (second pilot chamber) 522. A branch flow path 333 branched from the pressure oil flow path 330a is formed so as to connect between the pressure oil flow path 330a and the pilot chamber 521. Further, a branch flow path 363 branched from the drain flow path 360a is formed so as to connect the drain flow path 360a and the pilot chamber 521. The control valve 520 is connected to both the branch flow path 333 and the branch flow path 363, and is also connected to the flow path 521a (first pilot flow path) communicating with the pilot chamber 512, and the pressure supplied to the pilot chamber 521. It has an electromagnetic proportional valve (first proportional valve) 523 that controls oil and pressure oil discharged from the pilot chamber 521.

A branch flow path 334 branched from the pressure oil flow path 330a is formed so as to connect between the pressure oil flow path 330a and the pilot chamber 522. Further, a branch flow path 364 branched from the drain flow path 360a is formed so as to connect the drain flow path 360a and the pilot chamber 522. The control valve 520 is connected to both the branch flow path 334 and the branch flow path 364, and is also connected to the flow path 522a (second pilot flow path) communicating with the pilot chamber 522, and the pressure supplied to the pilot chamber 522. It has an electromagnetic proportional valve (second proportional valve) 524 that controls oil and pressure oil discharged from the pilot chamber 522.

Similarly, the control valve 530 includes a pilot chamber (first pilot chamber) 531 and a pilot chamber (second pilot chamber) 532. A branch flow path 335 branched from the pressure oil flow path 330a is formed so as to connect between the pressure oil flow path 330a and the pilot chamber 531. Further, a branch flow path 365 branched from the drain flow path 360a is formed so as to connect the drain flow path 360a and the pilot chamber 531. The control valve 530 is connected to both the branch flow path 335 and the branch flow path 365, and is also connected to the flow path 531a (first pilot flow path) communicating with the pilot chamber 531 to supply pressure to the pilot chamber 531. It has an electromagnetic proportional valve (first proportional valve) 533 that controls oil and pressure oil discharged from the pilot chamber 531.

A branch flow path 336 branched from the pressure oil flow path 330a is formed so as to connect between the pressure oil flow path 330a and the pilot chamber 532. Further, a branch flow path 366 branched from the drain flow path 360a is formed so as to connect the drain flow path 360a and the pilot chamber 532. The control valve 530 is connected to both the branch flow path 336 and the branch flow path 366, and is also connected to the flow path 532a (second pilot flow path) communicating with the pilot chamber 532, and the pressure supplied to the pilot chamber 532. It has an electromagnetic proportional valve (second proportional valve) 534 that controls oil and pressure oil discharged from the pilot chamber 532.

Similarly, the control valve 540 includes a pilot chamber (first pilot chamber) 541 and a pilot chamber (second pilot chamber) 542. A branch flow path 337 branched from the pressure oil flow path 330a is formed so as to connect between the pressure oil flow path 330a and the pilot chamber 541. Further, a branch flow path 367 branched from the drain flow path 360a is formed so as to connect the drain flow path 360a and the pilot chamber 541. The control valve 540 is connected to both the branch flow path 337 and the branch flow path 367, and is also connected to the flow path 541a (first pilot flow path) communicating with the pilot chamber 541 to supply the pressure to the pilot chamber 541. It has an electromagnetic proportional valve (first proportional valve) 543 that controls oil and pressure oil discharged from the pilot chamber 541.

A branch flow path 338 branched from the pressure oil flow path 330a is formed so as to connect between the pressure oil flow path 330a and the pilot chamber 542. Further, a branch flow path 368 branched from the drain flow path 360a is formed so as to connect the drain flow path 360a and the pilot chamber 542. The control valve 540 is connected to both the branch flow path 338 and the branch flow path 368, and is also connected to the flow path 542a (second pilot flow path) communicating with the pilot chamber 542, and the pressure supplied to the pilot chamber 542. It has an electromagnetic proportional valve (second proportional valve) 544 that controls oil and pressure oil discharged from the pilot chamber 542.

Similarly, the control valve 550 includes a pilot chamber (first pilot chamber) 551 and a pilot chamber (second pilot chamber) 552. A branch flow path 339 branched from the pressure oil flow path 330b is formed so as to connect between the pressure oil flow path 330b and the pilot chamber 551. Further, a branch flow path 369 branched from the drain flow path 360b is formed so as to connect the drain flow path 360b and the pilot chamber 551. The control valve 550 is connected to both the branch flow path 339 and the branch flow path 369, and is also connected to the flow path 551a (first pilot flow path) communicating with the pilot chamber 551 to supply the pressure to the pilot chamber 551. It has an electromagnetic proportional valve (first proportional valve) 553 that controls oil and pressure oil discharged from the pilot chamber 551.

A branch flow path 340 branched from the pressure oil flow path 330b is formed so as to connect between the pressure oil flow path 330b and the pilot chamber 552. Further, a branch flow path 370 branched from the drain flow path 360b is formed so as to connect the drain flow path 360b and the pilot chamber 552. The control valve 550 is connected to both the branch flow path 340 and the branch flow path 370, and is also connected to the flow path 552a (second pilot flow path) communicating with the pilot chamber 552, and the pressure supplied to the pilot chamber 552. It has an electromagnetic proportional valve (second proportional valve) 554 that controls oil and pressure oil discharged from the pilot chamber 552.

Similarly, the control valve 560 includes a pilot chamber (first pilot chamber) 561 and a pilot chamber (second pilot chamber) 562. A branch flow path 341 branched from the pressure oil flow path 330b is formed so as to connect between the pressure oil flow path 330b and the pilot chamber 561. Further, a branch flow path 371 branched from the drain flow path 360b is formed so as to connect the drain flow path 360b and the pilot chamber 561. The control valve 560 is connected to both the branch flow path 341 and the branch flow path 371, and is also connected to the flow path 561a (first pilot flow path) communicating with the pilot chamber 561 to supply pressure to the pilot chamber 561. It has an electromagnetic proportional valve (first proportional valve) 563 that controls oil and pressure oil discharged from the pilot chamber 561.

A branch flow path 342 branched from the pressure oil flow path 330b is formed so as to connect between the pressure oil flow path 330b and the pilot chamber 562. Further, a branch flow path 372 branched from the drain flow path 360b is formed so as to connect the drain flow path 360b and the pilot chamber 562. The control valve 560 is connected to both the branch flow path 342 and the branch flow path 372, and is also connected to the flow path 562a (second pilot flow path) communicating with the pilot chamber 562, and the pressure supplied to the pilot chamber 562. It has an electromagnetic proportional valve (second proportional valve) 564 that controls oil and pressure oil discharged from the pilot chamber 562.

The control valve 570 includes a pilot chamber 571. In this embodiment, the control valve 570 includes only one pilot chamber 571.

A branch flow path 343 branched from the pressure oil flow path 330b is formed so as to connect between the pressure oil flow path 330b and the pilot chamber 571. Further, a branch flow path 373 branched from the drain flow path 360b is formed so as to connect the drain flow path 360b and the pilot chamber 572. The control valve 570 is connected to both the branch flow path 343 and the branch flow path 373, and is also connected to the flow path 571a communicating with the pilot chamber 571, and is discharged from the pressure oil supplied to the pilot chamber 571 and the pilot chamber 571. It has an electromagnetic proportional valve 573 that controls the pressure oil to be pressed. Further, the control valve 570 has a spring 574 that urges the spool to a neutral position.

Further, the control valve 580 includes a pilot chamber (first pilot chamber) 581 and a pilot chamber (second pilot chamber) 582. A branch flow path 344 branched from the pressure oil flow path 330b is formed so as to connect between the pressure oil flow path 330b and the pilot chamber 581. Further, a branch flow path 374 branched from the drain flow path 360b is formed so as to connect the drain flow path 360b and the pilot chamber 581. The control valve 580 is connected to both the branch flow path 344 and the branch flow path 374, and is also connected to the flow path 581a (first pilot flow path) communicating with the pilot chamber 581, and the pressure supplied to the pilot chamber 581. It has an electromagnetic proportional valve (first proportional valve) 583 that controls oil and pressure oil discharged from the pilot chamber 581.

A branch flow path 345 branched from the pressure oil flow path 330b is formed so as to connect between the pressure oil flow path 330b and the pilot chamber 582. Further, a branch flow path 375 branched from the drain flow path 360b is formed so as to connect the drain flow path 360b and the pilot chamber 582. The control valve 580 is connected to both the branch flow path 345 and the branch flow path 375, and is also connected to the flow path 582a (second pilot flow path) communicating with the pilot chamber 582, and the pressure supplied to the pilot chamber 582. It has an electromagnetic proportional valve (second proportional valve) 584 that controls oil and pressure oil discharged from the pilot chamber 582.

In this way, the respective control valves 510, 520, 530, 540, 550, 560, and 580 are the first proportional valve that controls the pilot pressure inside the first pilot chamber and the pilot pressure inside the second pilot chamber. It has a second proportional valve that controls. Further, the control valve 570 has one proportional valve that controls the pilot pressure inside one pilot chamber.

The electromagnetic proportional valves 513 and 514 provided in the control valve 510 will be described in more detail with reference to FIG. As shown in FIG. 3, the control valve 510 is an electromagnetic proportional valve 513 that controls the pressure oil supplied to the pilot chamber 511 and the pressure oil discharged from the pilot chamber 511 to control the hydraulic pressure inside the pilot chamber 511. It is provided with an electromagnetic proportional valve 514 that controls the pressure oil supplied to the pilot chamber 512 and the pressure oil discharged from the pilot chamber 512 and controls the hydraulic pressure inside the pilot chamber 512.

The electromagnetic proportional valve 513 switches the flow path of the connection destination connected to the flow path 511a communicating with the pilot chamber 511 according to the applied electric signal, and adjusts the flow rate of the pressure oil flowing through the flow path. Can be done. Specifically, in the electromagnetic proportional valve 513, the flow path connected to the flow path 511a is switched between the branch flow path 331 and the branch flow path 361. Thereby, either the supply of the pressure oil to the pilot chamber 511 or the discharge of the pressure oil from the pilot chamber 511 can be selectively performed. When supplying the pressure oil to the pilot chamber 511, the pressure oil is supplied to the electromagnetic proportional valve 513 via the branch flow path 331 branched from the pressure oil flow path 330a, and the pressure oil passing through the electromagnetic proportional valve 513 is supplied. It is supplied to the pilot chamber 511 through the flow path 511a through which the pressure oil flows between the electromagnetic proportional valve 513 and the pilot chamber 511. Further, when the pressure oil is discharged from the pilot chamber 511, the pressure oil inside the pilot chamber 511 passes through the electromagnetic proportional valve 513 via the flow path 511a and joins the drain flow path 360a via the branch flow path 362. Let me. As a result, the electromagnetic proportional valve 513 adjusts the pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 511, and adjusts the pressure oil discharged from the first pilot chamber 511 to the drain flow path 360a, and the pilot The pressure in the chamber 511 can be adjusted.

Similarly, the electromagnetic proportional valve 514 can switch the flow path to be connected to the flow path 512a communicating with the pilot chamber 512 according to the applied electric signal. In the electromagnetic proportional valve 514, the flow path connected to the flow path 512a is switched between the branch flow path 332 and the branch flow path 362. Either the supply of the pressure oil to the pilot chamber 512 or the discharge of the pressure oil from the pilot chamber 512 can be selectively performed. When supplying the pressure oil to the pilot chamber 512, the pressure oil is supplied to the electromagnetic proportional valve 514 via the branch flow path 332 branched from the pressure oil flow path 330a, and the pressure oil passing through the electromagnetic proportional valve 514 is supplied. It is supplied to the pilot chamber 512 through the flow path 512a through which the pressure oil flows between the electromagnetic proportional valve 514 and the pilot chamber 512. Further, when the pressure oil is discharged from the pilot chamber 512, the pressure oil inside the pilot chamber 512 passes through the electromagnetic proportional valve 514 via the flow path 512a and joins the drain flow path 360a via the branch flow path 362. Let me. As a result, the electromagnetic proportional valve 514 adjusts the pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 512, and also adjusts the pressure oil discharged from the pilot chamber 512 to the drain flow path 360a, so that the pilot chamber 512 The pressure can be adjusted.

When the operating lever is tilted by the driver, an electric signal corresponding to the tilt angle of the operating lever is output to the control device (not shown). When the control device detects that the operating lever has been tilted by the driver, the control device is electromagnetically proportional so that the pressure of the pressure oil inside each pilot chamber becomes the pressure corresponding to the inclination angle of the operating lever. Controls the current supplied to the valve. As a result, the pressure oil flows into the inside of the pilot chamber through the electromagnetic proportional valve so that the pressure of the pressure oil inside each pilot chamber becomes a pressure corresponding to the inclination angle of the operating lever. As a result, each pilot pressure is controlled so that the pilot pressure in the pilot pressure receiving portion inside each pilot chamber becomes the pilot pressure according to the inclination angle of the operating lever.

The control valves 510 to 580 shown in FIGS. 1 to 3 are housed inside the housing 100 (see FIGS. 4 to 7) to form the multi-control valve unit 1000.

FIG. 4 shows a perspective view of the multi-control valve unit 1000. In FIG. 4, in the multi-control valve unit 1000, the regions where the control valves 510 to 580 shown in FIG. 1 are located are separated by broken lines and indicated by reference numerals.

The multi-control valve unit 1000 includes a housing 100. The housing 100 has a rectangular parallelepiped box shape. Inside the housing 100, a plurality of valve chambers of control valves 510 to 580 for controlling various actuators are housed.

A plurality of valve chambers are arranged in the D1 direction (first direction) orthogonal to the axial direction of the spool to form a valve chamber row. In the present embodiment, four valve chambers are arranged in a row in the D1 direction to form a valve chamber row. Further, a plurality of valve chamber rows in which the four valve chambers are arranged in the D1 direction are arranged in the D2 direction (second direction) intersecting the D1 direction. In this embodiment, two valve chamber rows are arranged in the D2 direction. Further, in FIG. 4, the axial direction of the spool orthogonal to the D1 direction and the D2 direction is referred to as the D3 direction.

The housing 100 is formed with pump ports 110a and 110b for passing pressure oil from hydraulic pumps 200a and 200b. In the multi-control valve unit 1000 of the present embodiment, two pump ports 110a and 110b are formed in the housing 100. Therefore, the pressure oil supplied from the two hydraulic pumps can be guided to the inside of the housing 100 by different systems through the flow paths of the pressure oils communicating with the two pump ports 110a and 110b.

Inside the housing 100, a row of control valves arranged along the direction in which pressure oil from one hydraulic pump 200a is supplied through the pump port 110a, and a row of control valves from the other hydraulic pump 200b pass through the pump port 110b. A row of control valves arranged along the direction in which the hydraulic oil is supplied is formed.

A cover (first pilot chamber forming member) 700 is attached to the housing 100. The cover 700 is provided on only one side of the housing 100 and is attached below the housing 100 in FIG. In the present embodiment, different covers 700a and 700b are attached to the housing 100 for each valve chamber row.

FIG. 5 shows a cross-sectional view of the multi-control valve unit 1000. FIG. 5 (a) shows a cross-sectional view of the internal configuration of the multi-control valve unit 1000 of FIG. 4 as viewed in the D2 direction, and FIG. 5 (b) shows the inside of the multi-control valve unit 1000. A cross-sectional view of the configuration as viewed in the D1 direction is shown. In FIG. 5, the cover 700 is arranged so as to face downward in the direction of gravity so that the multi-control valve unit 1000 is in the posture when it is mounted on the hydraulic excavator (FIG. 8).

As shown in FIG. 5A, in each of the plurality of control valves, inside the housing 100, among the control valves 510 to 580, the valve chambers 516, 526, 536, 546, 556, 566, 576, Only 586 are placed. No pilot chamber is formed inside the housing 100. Inside the housing 100, the valve chambers 516 to 586 are arranged so that their axial directions are parallel to each other. Further, inside each of the valve chambers 516 to 586, spools 515, 525, 535, 545, 555, 565, 565, 585 are arranged so that the axial directions are parallel to each other.

On the other side of the housing 100, opposite to the one on which the cover 700 is attached, a spring chamber is formed that extends from the valve chamber to the outside of the housing 100 and internally forms a pilot chamber for the corresponding control valve. Members 120a to 120h are attached. A pilot chamber (second pilot chamber) of the corresponding control valve is formed inside the spring chamber forming members 120a to 120h. The respective spring chamber forming members 120a to 120h are attached to the housing 100 so that the tip portions of the spring chamber forming members 120a to 120h project to the outside of the housing 100. In the present embodiment, the spring chamber forming members 120a to 120h are arranged so as to individually cover the plurality of pilot chambers.

Further, inside the spring chamber forming members 120a to 120h, springs 517, 527, 537, 547, 557, 567, 574, 587 for returning the spools 515 to 585 to the neutral position are arranged. Further, inside each of the spring chamber forming members 120a to 120h, an upper ring and a lower ring are arranged in order to hold the springs 517 to 587 at predetermined positions inside the spring chamber forming members 120a to 120h. There is. The spools 515 to 585 are configured to be held in a neutral position by being urged by springs 517 to 587 and to move in response to the pilot pressure in the pilot chamber. The spring chamber forming members 120a to 120h form a pilot chamber (second pilot chamber) inside, and also function as a spring chamber for accommodating the springs 517 to 587 inside. Although the present embodiment describes a mode in which the entire pilot chamber (second pilot chamber) is formed inside the spring chamber forming members 120a to 120h, the present invention is not limited to the above embodiment. Only a part of the pilot chamber (second pilot chamber) may be formed inside the spring chamber forming members 120a to 120h. It is sufficient that at least a part of the pilot chamber (second pilot chamber) is formed inside the spring chamber forming members 120a to 120h.

In this embodiment, the spring chamber forming member 120a is attached to the housing 100 so as to form the pilot chamber 512 of the control valve 510. Similarly, the spring chamber forming member 120b is attached to the housing 100 so as to form the pilot chamber 522 of the control valve 520. Further, the spring chamber forming member 120c is attached to the housing 100 so as to form the pilot chamber 532 of the control valve 530. Further, the spring chamber forming member 120d is attached to the housing 100 so as to form the pilot chamber 542 of the control valve 540. Further, the spring chamber forming member 120e is attached to the housing 100 so as to form the pilot chamber 552 of the control valve 550. Further, the spring chamber forming member 120f is attached to the housing 100 so as to form the pilot chamber 562 of the control valve 560. Further, the spring chamber forming member 120 g is attached to the housing 100 so as to form the pilot chamber 571 of the control valve 570. Further, the spring chamber forming member 120h is attached to the housing 100 so as to form the pilot chamber 582 of the control valve 580.

On one side of the housing 100, a cover 700 forms a pilot chamber (first pilot chamber). A recess is formed inside the cover 700, and the cover 700 is attached to the housing 100 so as to cover the end of the valve chamber, so that a pilot chamber is formed between the housing 100 and the cover 700. As described above, the cover 700 is arranged on one side of the housing 100 so as to cover the plurality of pilot chambers. In the present embodiment, the embodiment in which the entire pilot chamber formed inside the cover 700 is formed inside the cover 700 has been described, but the present invention is not limited to the above embodiment. The control valve may be configured such that only a part of the pilot chamber is formed on the cover 700 and a part of the pilot chamber is formed inside the housing 100. At least a part of the pilot chamber may be formed on the cover 700.

In the present embodiment, the pilot chamber 511 of the control valve 510, the pilot chamber 521 of the control valve 520, the pilot chamber 531 of the control valve 530, and the pilot chamber 541 of the control valve 540 are formed inside the cover 700a. There is. Further, inside the cover 700b, a pilot chamber 551 of the control valve 550, a pilot chamber 561 of the control valve 560, and a pilot chamber 581 of the control valve 580 are formed.

A pressure oil flow path 330a is formed in the cover 700a along the D1 direction of FIGS. 4 and 5A. A pressure oil flow path 330b is formed in the cover 700b along the D1 direction. The pressure oil flow paths 330a and 330b are formed over substantially the entire D1 direction of the covers 700a and 700b. Therefore, the pressure oil flow path 330a is formed so as to communicate with each of the plurality of pilot chambers 511, 512, 521, 522, 531, 532, 541, and 542. Further, the pressure oil flow path 330b is formed so as to communicate with each of the plurality of pilot chambers 551, 552, 561, 562, 571, 572, 581, and 582.

Similarly, the cover 700a is formed with a drain flow path 360a along the D1 direction of FIGS. 4 and 5A. A drain flow path 360b is formed in the cover 700b along the D1 direction. The drain flow paths 360a and 360b are formed over substantially the entire D1 direction of the covers 700a and 700b. Therefore, the drain flow path 360a is formed so as to communicate with each of the plurality of pilot chambers 511, 512, 521, 522, 521, 532, 541, 542. Further, the drain flow path 360b is formed so as to communicate with each of the plurality of pilot chambers 551, 552, 561, 562, 571, 581 and 582.

As shown in FIG. 5B, two electromagnetic proportional valves are attached to one control valve at positions corresponding to the control valves on the cover 700.

An electromagnetic proportional valve 513 and an electromagnetic proportional valve 514 are attached to the cover 700a of the control valve 510. The electromagnetic proportional valve 513 is connected to the branch flow path 331 and the branch flow path 361 and is also connected to the flow path 511a (FIG. 2). Therefore, the electromagnetic proportional valve 513 is used to control the amount of pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 511 and the amount of pressure oil discharged from the pilot chamber 511 to the drain flow path 360a. Therefore, the pilot pressure (first pilot pressure) inside the pilot chamber 511 can be controlled. Further, the electromagnetic proportional valve 514 is connected to the branch flow path 332 and the branch flow path 362 and is connected to and attached to the flow path 512a. Therefore, the electromagnetic proportional valve 514 is used to control the amount of pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 512 and the amount of pressure oil discharged from the pilot chamber 512 to the drain flow path 360b. Therefore, the pilot pressure (second pilot pressure) inside the pilot chamber 512 can be controlled. By controlling the respective pilot pressures using the electromagnetic proportional valves 513 and 514, the spool 515 inside the valve chamber 516 for the control valve 510 can be moved.

An electromagnetic proportional valve 523 and an electromagnetic proportional valve 524 are attached to the cover 700a of the control valve 520. The electromagnetic proportional valve 523 is connected to the branch flow path 333 and the branch flow path 363 and is connected to and attached to the flow path 521a. Therefore, the electromagnetic proportional valve 523 is used to control the amount of pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 521 and the amount of pressure oil discharged from the pilot chamber 521 to the drain flow path 360a. Therefore, the pilot pressure inside the pilot chamber 521 can be controlled. Further, the electromagnetic proportional valve 524 is connected to the branch flow path 334 and the branch flow path 364 and is connected to and attached to the flow path 522a. Therefore, the electromagnetic proportional valve 524 is used to control the amount of pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 522 and the amount of pressure oil discharged from the pilot chamber 522 to the drain flow path 360a. Therefore, the pilot pressure inside the pilot chamber 522 can be controlled. By controlling the respective pilot pressures using the electromagnetic proportional valves 523 and 524, the spool 525 inside the valve chamber 526 for the control valve 520 can be moved.

An electromagnetic proportional valve 533, 534 is attached to the cover 700a of the control valve 530. The electromagnetic proportional valve 533 is connected to the branch flow path 335 and the branch flow path 365 and is connected to and attached to the flow path 531a. Therefore, the electromagnetic proportional valve 533 is used to control the amount of pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 531 and the amount of pressure oil discharged from the pilot chamber 531 to the drain flow path 360a. Therefore, the pilot pressure inside the pilot chamber 531 can be controlled. Further, the electromagnetic proportional valve 534 is connected to the branch flow path 336 and the branch flow path 366 and is connected to and attached to the flow path 532a. Therefore, the electromagnetic proportional valve 534 is used to control the amount of pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 532 and the amount of pressure oil discharged from the pilot chamber 532 to the drain flow path 360a. Therefore, the pilot pressure inside the pilot chamber 532 can be controlled. By controlling the respective pilot pressures using the electromagnetic proportional valves 533 and 534, the spool 535 inside the valve chamber 536 for the control valve 530 can be moved.

An electromagnetic proportional valve 543, 544 is attached to the cover 700a of the control valve 540. The electromagnetic proportional valve 543 is connected to the branch flow path 337 and the branch flow path 367 and is connected to and attached to the flow path 541a. Therefore, the electromagnetic proportional valve 543 is used to control the amount of pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 541 and the amount of pressure oil discharged from the pilot chamber 541 to the drain flow path 360a. Therefore, the pilot pressure inside the pilot chamber 541 can be controlled. Further, the electromagnetic proportional valve 544 is connected to the branch flow path 338 and the branch flow path 368 and is connected to and attached to the flow path 542a. Therefore, the electromagnetic proportional valve 544 is used to control the amount of pressure oil supplied from the pressure oil flow path 330a to the pilot chamber 542 and the amount of pressure oil discharged from the pilot chamber 542 to the drain flow path 360a. Therefore, the pilot pressure inside the pilot chamber 542 can be controlled. By controlling the respective pilot pressures using the electromagnetic proportional valves 543 and 544, the spool 545 inside the valve chamber 546 for the control valve 540 can be moved.

An electromagnetic proportional valve 535 and 554 are attached to the cover 700b of the control valve 550. The electromagnetic proportional valve 553 is connected to the branch flow path 339 and the branch flow path 369 and is connected to and attached to the flow path 551a. Therefore, the electromagnetic proportional valve 553 is used to control the amount of pressure oil supplied from the pressure oil flow path 330b to the pilot chamber 551 and the amount of pressure oil discharged from the pilot chamber 551 to the drain flow path 360b. Therefore, the pilot pressure inside the pilot chamber 551 can be controlled. Further, the electromagnetic proportional valve 554 is connected to the branch flow path 340 and the branch flow path 370 and is connected to and attached to the flow path 552a. Therefore, the electromagnetic proportional valve 554 is used to control the amount of pressure oil supplied from the pressure oil flow path 330b to the pilot chamber 552 and the amount of pressure oil discharged from the pilot chamber 552 to the drain flow path 360b. Therefore, the pilot pressure inside the pilot chamber 552 can be controlled. By controlling the respective pilot pressures using the electromagnetic proportional valves 535 and 554, the spool 555 inside the valve chamber 556 for the control valve 550 can be moved.

An electromagnetic proportional valve 563, 564 is attached to the cover 700b of the control valve 560. The electromagnetic proportional valve 563 is connected to the branch flow path 341 and the branch flow path 371 and is connected to and attached to the flow path 561a. Therefore, the electromagnetic proportional valve 563 is used to control the amount of pressure oil supplied from the pressure oil flow path 330b to the pilot chamber 561 and the amount of pressure oil discharged from the pilot chamber 561 to the drain flow path 360b. Therefore, the pilot pressure inside the pilot chamber 561 can be controlled. Further, the electromagnetic proportional valve 564 is connected to the branch flow path 342 and the branch flow path 372 and is connected to and attached to the flow path 562a. Therefore, the electromagnetic proportional valve 564 is used to control the amount of pressure oil supplied from the pressure oil flow path 330b to the pilot chamber 562 and the amount of pressure oil discharged from the pilot chamber 562 to the drain flow path 360b. Therefore, the pilot pressure inside the pilot chamber 562 can be controlled. By controlling the respective pilot pressures using the electromagnetic proportional valves 563 and 564, the spool 565 inside the valve chamber 566 for the control valve 560 can be moved.

An electromagnetic proportional valve 573 is attached to the cover 700b of the control valve 570. The electromagnetic proportional valve 573 is connected to the branch flow path 343 and the branch flow path 373 and is connected to and attached to the flow path 571a. Therefore, the electromagnetic proportional valve 573 is used to control the amount of pressure oil supplied from the pressure oil flow path 330b to the pilot chamber 571 and the amount of pressure oil discharged from the pilot chamber 571 to the drain flow path 360b. Therefore, the pilot pressure inside the pilot chamber 571 can be controlled. By controlling the pilot pressure in the pilot chamber 571 using the electromagnetic proportional valve 573, the spool 575 inside the valve chamber 576 for the control valve 570 can be moved.

Electromagnetic proportional valves 583 and 584 are attached to the cover 700b of the control valve 580. The electromagnetic proportional valve 583 is connected to the branch flow path 344 and the branch flow path 374 and is connected to and attached to the flow path 581a. Therefore, the electromagnetic proportional valve 583 is used to control the amount of pressure oil supplied from the pressure oil flow path 330b to the pilot chamber 581 and the amount of pressure oil discharged from the pilot chamber 581 to the drain flow path 360b. Therefore, the pilot pressure inside the pilot chamber 581 can be controlled. Further, the electromagnetic proportional valve 584 is connected to the branch flow path 345 and the branch flow path 375 and is connected to and attached to the flow path 582a. Therefore, the electromagnetic proportional valve 584 is used to control the amount of pressure oil supplied from the pressure oil flow path 330b to the pilot chamber 582 and the amount of pressure oil discharged from the pilot chamber 582 to the drain flow path 360b. Therefore, the pilot pressure inside the pilot chamber 582 can be controlled. By controlling the respective pilot pressures using the electromagnetic proportional valves 583 and 584, the spool 585 inside the valve chamber 586 for the control valve 580 can be moved.

As described above, in the present embodiment, in the control valve having two electromagnetic proportional valves, any of the electromagnetic proportional valves arranged two by two for each control valve is located on one side of the housing 100. It is attached to the arranged cover 700. That is, the electromagnetic proportional valve is provided on only one side of the spool in each of the control valves 510 to 580.

Since all electromagnetic proportional valves are provided on only one side of the spool, one of the two electromagnetic proportional valves is connected to a pilot chamber located at a relatively distant position. In the control valve 510, the electromagnetic proportional valve 514 is used to control the pilot pressure inside the pilot chamber 512 on the other side of the spool. Therefore, in the present embodiment, the flow path 512a connected between the electromagnetic proportional valve 514 and the pilot chamber 512 is formed so as to penetrate the inside of the housing 100 in the same D3 direction as the axial direction of the spool. .. The pressure oil in the pressure oil flow path 330a is supplied to the inside of the pilot chamber 512 through the flow path 512a that crosses the housing 100, and the pressure oil inside the pilot chamber 512 passes through the flow path 512a and drains. It is discharged to 360a. The electromagnetic proportional valve 514 is used to control the direction of the pressure oil flowing through the inside of the flow path 512a that crosses the housing 100 in the D3 direction (FIG. 4) and the flow rate of the pressure oil.

Similarly, in the control valve 520, the pressure oil inside the pilot chamber 522 is supplied and discharged through the flow path 522a that crosses the housing 100 in the D3 direction. In the control valve 530, the pressure oil inside the pilot chamber 532 is supplied and discharged through 532a that crosses the housing 100 in the D3 direction. In the control valve 540, the pressure oil inside the pilot chamber 542 is supplied and discharged through the flow path 542a that crosses the housing 100 in the D3 direction. In the control valve 550, the pressure oil inside the pilot chamber 552 is supplied and discharged through the flow path 552a that crosses the housing 100 in the D3 direction. In the control valve 560, the pressure oil inside the pilot chamber 562 is supplied and discharged through the flow path 562a that crosses the housing 100 in the D3 direction. In the control valve 570, the pressure oil inside the pilot chamber 571 is supplied and discharged through the flow path 571a that crosses the housing 100 in the D3 direction. In the control valve 580, the pressure oil inside the pilot chamber 582 is supplied and discharged through the flow path 582a that crosses the housing 100 in the D3 direction.

The pressure oil flow path 330a passing through the cover 700a and the pressure oil flow path 330b passing through the cover 700b communicate with each other. Further, the drain flow path 360a passing through the cover 700a and the drain flow path 360b passing through the cover 700b communicate with each other. FIG. 6 shows a cross-sectional view of the flow path of the portion where the pressure oil flow paths 330a and 330b are in communication with each other and the portion where the drain flow paths 360a and 360b are in communication with each other. In the present embodiment, the pressure oil flow path 330a and the pressure oil flow path 330b communicate with each other at an end portion (end portion on the control valve 510 side) in the direction opposite to the D1 direction shown in FIG. 5 (a). .. Similarly, the drain flow path 360a and the drain flow path 360b communicate with each other at an end portion in a direction opposite to the D1 direction shown in FIG. 5A.

The pressure oil flow paths 330a and 330b are the ends in the direction opposite to the D1 direction in FIG. Has been changed. In this embodiment, the direction of the flow path is changed so as to face upward in FIG. The pressure oil flow paths 330a and 330b extend upward, and the directions of the flow paths are further changed inside the housing 100 so as to face directions close to each other. Therefore, the pressure oil flow paths 330a, 330b, and 330c are respectively configured so that the pressure oil flow paths 330a and 330b communicate with each other at the pressure oil flow paths 330c inside the housing 100. Similarly, the drain flow paths 360a and 360b are end portions in a direction opposite to the D1 direction in FIG. The direction of is changed. In this embodiment, the direction of the flow path is changed so as to face upward in FIG. The drain flow paths 360a and 360b extend upward, and the directions of the flow paths are further changed inside the housing 100 so as to face directions close to each other. Therefore, the drain flow paths 360a, 360b, and 360c are respectively configured so that the drain flow paths 360a and 360b communicate with each other by the drain flow paths 360c inside the housing 100.

In the present embodiment, as shown in FIG. 6, the positions where the pressure oil flow paths 330a and 330b communicate with each other and the positions where the drain flow paths 360a and 360b communicate with each other are the same positions in the D1 direction. Is.

In the present embodiment, as shown in FIG. 2, the hydraulic excavator hydraulic drive device 2000 is provided with a hydraulic pump 200c for supplying pressure oil to the pressure oil flow path 330. By driving the hydraulic pump 200c, the pressure oil is supplied from the control valve 580 toward the control valve 550 in the pressure oil flow path 330a, further flows into the pressure oil flow path 330b, and the control valve 510. Is supplied from the control valve 540. Therefore, pressure oil can be supplied to the control valves 510 to 580. However, the present invention is not limited to the above embodiment. The hydraulic drive system 2000 for a hydraulic excavator is configured so that the pressure oil in the pressure oil flow path 330 is not supplied by the hydraulic pump 200c but is supplied into the pressure oil flow path 330 by another configuration. You may. For example, a part of the pressure oil from the supply lines 310 and 320 to which the pressure oil is supplied by the hydraulic pumps 200a and 200b shown in FIG. 1 is guided to the pressure oil flow path 330, and the pressure oil in the pressure oil flow path 330 is introduced. It may be used for supply. At that time, if the pressure of the pressure oil from the hydraulic pumps 200a and 200b is too high to be used for supplying the pressure oil in the pressure oil flow path 330, the pressure of the pressure oil supplied in the pressure oil flow path 330 A configuration may be used to reduce. For example, a pressure reducing valve may be used to reduce the pressure of the pressure oil supplied into the pressure oil flow path 330.

FIG. 7 shows a mode in which the hydraulic pump 200c is not used, and a part of the pressure oil from the supply lines 310 and 320 to which the pressure oil is supplied by the hydraulic pumps 200a and 200b is guided to the pressure oil flow path 330. , The cross-sectional view of the housing 100a and the flow path of the hydraulic oil is shown.

A cover 800 is attached to the housing 100a shown in FIG. 7. Inside the cover 800, there are a flow path 810 that communicates with the pressure oil flow path 330a and allows the pressure oil to flow inside, and a pressure reducing valve 820 that is connected to the flow path 810 and can reduce the pressure of the pressure oil that flows. A flow path 830 connected to the pressure reducing valve 820 and through which pressure oil flows is arranged.

The flow path 830 is connected to, for example, the supply line 310, and a part of the pressure oil flowing inside the supply line 310 is supplied to the inside of the flow path 830. The pressure oil supplied from the supply line 310 to the flow path 830 is supplied to the flow path 810 via the pressure reducing valve 820 and is supplied to the pressure oil flow path 330a. Since the pressure oil flowing inside the supply line 310 has a higher pressure than the pressure oil flowing inside the pressure oil flow path 330a, the pressure oil inside the supply line 310 cannot be used as it is. In the configuration of FIG. 7, since the pressure oil from the supply line 310 is supplied to the pressure oil flow path 330a via the pressure reducing valve 820, the pressure of the pressure oil in the flow path 330a can be reduced until it becomes an appropriate pressure. It is possible to supply pressure oil of an appropriate pressure to the pressure oil flow path 330a.

With such a configuration, the pressure oil pump 200c can be omitted. As a result, the number of pressure oil pumps can be reduced. Therefore, the manufacturing cost of the hydraulic drive system 2000 for the hydraulic excavator can be kept low. Although the mode in which the flow path 830 is connected to the supply line 310 has been described in the form of FIG. 7, the flow path 830 may be connected to the supply line 320. Further, the pressure oil may be derived from another configuration as long as the pressure oil can be supplied to the pressure oil flow path 330. At that time, a configuration for appropriately adjusting the pressure of the pressure oil before being supplied to the pressure oil flow path 330 may be used. The configuration for appropriately adjusting the pressure of the pressure oil does not have to be a pressure reducing valve, and may be another configuration. At that time, not only the configuration for reducing the pressure but also the configuration for increasing the pressure may be used.

Next, the hydraulic excavator when the above-mentioned multi-control valve unit 1000 is mounted on the hydraulic excavator 3000 will be described. FIG. 8 shows a schematic side view of the multi-control valve unit 1000 and the hydraulic excavator 3000 in a state where the multi-control valve unit 1000 is mounted on the hydraulic excavator 3000.

Generally, in a construction machine such as a hydraulic excavator 3000, the multi-control valve unit 1000 is arranged so that the axial direction of the spool is along the direction of gravity so that maintenance can be easily performed. Further, the multi-control valve unit 1000 is often arranged behind the cabin because of the arrangement position of other configurations. Therefore, in the present embodiment, as shown in FIG. 8, the multi-control valve unit 1000 is mounted on the hydraulic excavator 3000 in a posture in which the cover 700 and the electromagnetic proportional valve are located at the rear position of the cabin and below.

In the multi-control valve unit 1000 of the present embodiment, all electromagnetic proportional valves are provided on only one side with respect to the spool. In the present embodiment, when the multi-control valve unit 1000 is mounted on the hydraulic excavator 3000 as shown in FIG. 8, the electromagnetic proportional valve is provided only at a position below the spool. Therefore, as shown in FIG. 8, when the multi-control valve unit 1000 is mounted on the hydraulic excavator 3000 so that the upper portion of the multi-control valve unit 1000 is exposed to the outside, the electromagnetic proportional valve is exposed to the outside. It can be suppressed. In particular, it is possible to prevent the electromagnetic proportional valve from being exposed to the outside at the upper part of the hydraulic excavator 3000.

If the electromagnetic proportional valves of the multi-control valve unit 1000 are attached to both sides in the axial direction of the spool, the electromagnetic proportional valves are also attached to the upper side of the multi-control valve unit 1000. At that time, the upper part of the multi-control valve unit is exposed to the outside, and the electromagnetic proportional valve is attached to the upper part, so that the electromagnetic proportional valve is exposed to the outside.

In particular, when the electromagnetic proportional valve is exposed to the outside at the upper part of the hydraulic excavator 3000, when the driver walks on the hydraulic excavator 3000 when getting on the hydraulic excavator or performing maintenance of the hydraulic excavator 3000. At that time, there is a possibility that the driver and the electromagnetic excavator collide with each other. The electromagnetic proportional valve is relatively prone to failure when it collides. Therefore, there is a possibility that the electromagnetic proportional valve may fail due to the collision between the electromagnetic proportional valve and the driver.

On the other hand, in the present embodiment, since the electromagnetic proportional valve can be arranged only on one side of the multi-control valve unit 1000, it is in the direction of gravity more than each of the spools of the multi-control valve unit 1000 shown in FIG. It can only be placed in the lower position. Therefore, the electromagnetic proportional valve is housed inside the hydraulic excavator 3000, and it is possible to suppress exposure to the outside above the hydraulic excavator 3000. Therefore, it is possible to prevent a collision between the electromagnetic proportional valve and the driver.

Further, when the driver walks on the hydraulic excavator 3000, the electromagnetic proportional valve is not arranged at the position above the hydraulic excavator 3000, so that the portion protruding upward in the multi-control valve unit 1000 by the amount of the electromagnetic proportional valve. Can be reduced. Therefore, it is possible to prevent the multi-control valve unit 1000 from becoming an obstacle when the driver walks.

Further, in the present embodiment, the electromagnetic proportional valve originally arranged so as to project further upward in the axial direction of the spool at the position above the axial direction of the spool in the multi-control valve unit 1000 is originally lowered. It is placed at a position that overlaps with the position where the electromagnetic proportional valve on the side was placed. Therefore, in the multi-control valve unit 1000, the length of the portion protruding upward in the axial direction of the spool can be suppressed to be small. That is, the length of the portion protruding upward from the housing 100 in the axial direction of the spool can be suppressed to be small. As a result, the length of the multi-control valve unit 1000 along the axial direction of the spool can be suppressed to be small, and the multi-control valve unit 1000 can be miniaturized.

Further, in the present embodiment, in the multi-control valve unit 1000, since all the electromagnetic proportional valves are provided on only one side with respect to the spool, there is a margin on the other side of the multi-control valve unit 1000. That is, on the other side opposite to the one side on which the electromagnetic proportional valve is attached to the housing 100 via the cover 700, there is a margin for the amount of the electromagnetic proportional valve removed. Therefore, additional configurations can be added to the space. For example, a sensor capable of detecting the position of the spool can be attached to the space. Since the position of the spool in each control valve can be detected by the sensor, the operating status of the device in the multi-control valve unit 1000 can be managed by managing the position of the spool. Therefore, by using the data of the operating status of the multi-control valve unit 1000, the multi-control valve unit 1000 can be controlled over a wider range.

Further, in the present embodiment, in the multi-control valve unit 1000, since the electromagnetic proportional valve is provided only on one side with respect to the spool, the positional relationship between the electromagnetic proportional valve and the spool is the same for all spools. become. In the present embodiment, all the electromagnetic proportional valves control the pilot pressure in the pilot chamber from a position below the spool to control the balance of the pilot pressure in each of the two pilot chambers, and move the spool. Control. At this time, since the positional relationship between the electromagnetic proportional valve and the spool is the same for all spools, the secondary pressure characteristics of the electromagnetic proportional valve can be made uniform among all the electromagnetic proportional valves. Since the secondary pressure characteristics among all the electromagnetic proportional valves are aligned, it is not necessary to adjust the secondary pressure for moving the spool for each electromagnetic proportional valve.

Further, in the present embodiment, the pressure oil flow path 330a is formed in the cover 700a, and the pressure oil flow path 330a is each of the pilot chambers (first pilot chambers) on one side of the four control valves 510 to 540. It communicates with each of the pilot room (second pilot room) on the other side. Therefore, in the cover 700a, the pressure oil flow path 330a can be commonly used between the four control valves 510 to 540. As a result, the flow path configuration of the pressure oil flow path 330a can be simplified between the four control valves 510 to 540, and the configuration of the multi-control valve unit 1000 can be simplified. Therefore, the multi-control valve unit 1000 can be miniaturized, and the manufacturing cost of the multi-control valve unit 1000 can be suppressed to a low level.

Further, a pressure oil flow path 330b is formed in the cover 700b, and the pressure oil flow path 330b is provided for each of the pilot chambers (first pilot chamber) on one side and the other side of the four control valves 550 to 580. It communicates with each of the pilot rooms (second pilot room). Therefore, in the cover 700b, the pressure oil flow path 330b can be commonly used between the four control valves 550 to 580. As a result, the flow path configuration of the pressure oil flow path 330b can be simplified between the four control valves 550 to 580, and the configuration of the multi-control valve unit 1000 can be simplified. Therefore, the multi-control valve unit 1000 can be further miniaturized, and the manufacturing cost of the multi-control valve unit 1000 can be further suppressed.

Further, in the present embodiment, between the four control valves 510 to 540, the four valve chambers are arranged in the D1 direction orthogonal to the axial direction of the spool, and the pressure oil flow path 330a is inside the cover 700a and is D1. It is formed so as to extend in the direction. Therefore, the direction in which the four valve chambers are arranged inside the cover 700a and the direction in which the pressure oil flow path 330a extends are configured to be the same.

Since the pressure oil flow path 330a is formed inside the cover 700a so as to extend in the same direction as the direction in which the four valve chambers are arranged, the configuration of the pressure oil flow path 330a can be further simplified. Therefore, the configuration of the multi-control valve unit 1000 can be simplified. Further, the pressure oil flow path 330b is also formed inside the cover 700b so that the four valve chambers extend in the same direction as the arranged direction, so that the configuration of the pressure oil flow path 330b can be simplified. Can be done. Therefore, the configuration of the multi-control valve unit 1000 can be simplified.

Further, in the present embodiment, the valve chamber rows in which the four valve chambers are arranged in the D1 direction are arranged in two in the D2 direction intersecting in the D1 direction, and the pressure provided for each valve chamber row. The oil flow paths 330a and 330b communicate with each other. Since the pressure oil passages 330a and 330b communicate with each other, the number of pressure oil passages 330a and 330b can be reduced, and the flow path configuration inside the multi-control valve unit 1000 can be simplified. ..

Further, in the present embodiment, the pressure oil flow path 330 is formed by one flow path. Therefore, the number of pipes connected to the pressure oil flow path 330 for supplying oil to the pressure oil flow path 330 can be reduced. If a pressure oil flow path is provided for each control valve, it is necessary to provide a pipe connected to the pressure oil flow path for each pressure oil flow path in order to supply oil to the pressure oil flow path. Therefore, the number of pipes connected to the pressure oil flow path increases, and the configuration of the pipes may become complicated.

Further, in the present embodiment, the cover 700a is provided with the drain flow path 360a, and the drain flow path 360a is provided in each of the drain ports for guiding the pressure oil to the tank in the four valve chambers of the control valves 510 to 540. I'm communicating. Therefore, in the cover 700a, the drain flow path 360a can be commonly used between the four control valves 510 to 540.

Thereby, the flow path configuration of the drain flow path 360a can be simplified among the four control valves 510 to 540, and the configuration of the multi-control valve unit 1000 can be simplified. Therefore, the multi-control valve unit 1000 can be miniaturized, and the manufacturing cost of the multi-control valve unit 1000 can be suppressed to a low level.

Further, in the present embodiment, between the four control valves 510 to 540, the four valve chambers are arranged in the D1 direction orthogonal to the axial direction of the spool, and the drain flow path 360a is inside the cover 700a in the D1 direction. It is formed by extending to. Therefore, the direction in which the four valve chambers are arranged inside the cover 700a and the direction in which the drain flow path 360a extends are configured to be the same.

Since the drain flow path 360a is formed inside the cover 700a so as to extend in the same direction as the direction in which the four valve chambers are arranged, the configuration of the drain flow path 360a can be further simplified. Therefore, the configuration of the multi-control valve unit 1000 can be simplified. Further, since the drain flow path 360b is also formed inside the cover 700b so that the four valve chambers extend in the same direction as the direction in which the four valve chambers are arranged, the configuration of the drain flow path 360b can be further simplified. .. Therefore, the configuration of the multi-control valve unit 1000 can be simplified.

Further, in the present embodiment, two valve chamber rows in which four valve chambers are arranged in the D1 direction are arranged in the D2 direction intersecting in the D1 direction, and a drain provided for each valve chamber row is provided. The flow paths 360a and 360b communicate with each other. Since the drain flow paths 360a and 360b communicate with each other, the number of drain flow paths 360a and 360b can be reduced, and the flow path configuration inside the multi-control valve unit 1000 can be further simplified.

Further, in the present embodiment, the drain flow path 360 is formed by one flow path. Therefore, the number of pipes connected to the drain flow path 360 in order to guide the oil discharged from each of the control valves 510 to 580 to the tank 300a can be reduced. If the drain flow path is provided separately for each control valve, it is necessary to provide a pipe connected to the drain flow path for each drain flow path in order to guide the oil discharged from the control valve to the tank. .. Therefore, the number of pipes connected to the drain flow path increases, and the pipe configuration may become complicated.

Further, in the present embodiment, each flow path is configured so that the pressure oil flow path 330a and the drain flow path 360a extend in the same direction inside the cover 700a. Therefore, the flow path configuration inside the cover 700a can be simplified. Further, inside the cover 700b, each flow path is configured so that the pressure oil flow path 330b and the drain flow path 360b extend in the same direction. Therefore, the flow path configuration inside the cover 700b can be simplified.

Further, in the present embodiment, the hydraulic excavator 3000 is configured to control the drive of the actuator by using the above-mentioned multi-control valve unit 1000. In this hydraulic excavator 3000, the multi-control valve unit 1000 is arranged at a position behind the cabin so that one side on which the electromagnetic proportional valve is arranged is located downward in the direction of gravity with respect to the spool.

Since the multi-control valve unit 1000 is mounted on the hydraulic excavator 3000, the configuration of the hydraulic excavator 3000 can be simplified. Therefore, the manufacturing cost of the hydraulic excavator 3000 can be suppressed, and the hydraulic excavator 3000 can be miniaturized.

Further, since the electromagnetic proportional valve is housed inside the hydraulic excavator 3000 and protected, it is possible to suppress the occurrence of a failure in the electromagnetic proportional valve, and it is possible to provide a highly reliable hydraulic excavator. ..

In the above embodiment, the direction in which the plurality of valve chambers of the control valves 510 to 540 are arranged and the direction in which the pressure oil flow path 330a extends inside the cover 700a are the same directions. The invention is not limited to the above embodiments. The direction in which the plurality of valve chambers of the control valves 510 to 540 are arranged may be different from the direction in which the pressure oil flow path 330a extends. Similarly, the direction in which the plurality of valve chambers of the control valves 550 to 580 are arranged may be different from the direction in which the pressure oil flow path 330b extends inside the cover 700b.

Further, in the above embodiment, the mode in which the pressure oil flow path 330a formed inside the cover 700a and the pressure oil flow path 330b formed inside the cover 700b communicate with each other inside the housing 100 has been described. , The present invention is not limited to the above embodiment. The position where the pressure oil flow path 330a and the pressure oil flow path 330b communicate with each other may be outside the housing 100. For example, a common cover covering one side of the spool is provided in the housing for both the control valves 510 to 540 and the control valves 550 to 580, and a pressure oil flow communicating with the control valves 510 to 540 inside the common cover. The path 330a and the pressure oil flow path 330b communicating with the control valves 550 to 580 may be configured to communicate with each other.

Further, in the above embodiment, the pressure oil flow path 330a formed inside the cover 700a and the pressure oil flow path 330b formed inside the cover 700b are in directions opposite to the D1 direction in each cover 700. Although the configurations in which the ends communicate with each other have been described, the present invention is not limited to the above embodiment. The position where the pressure oil flow path 330a and the pressure oil flow path 330b communicate with each other does not have to be the end portion in the direction opposite to the D1 direction. For example, the pressure oil flow path 330a and the pressure oil flow path 330b may be configured to communicate with each other at a position between a plurality of control valves arranged in the D1 direction. Further, the pressure oil flow path 330a and the pressure oil flow path 330b do not necessarily have to communicate with each other. If the flow path configuration for the pressure oil flow path is simplified by using the pressure oil flow path in common for one row of control valves, the pressure oil flow paths configured for each row do not necessarily communicate with each other. You don't have to.

Further, in the above embodiment, the direction in which the plurality of valve chambers of the control valves 510 to 540 are arranged and the direction in which the drain flow path 360a extends inside the cover 700a are the same directions. Is not limited to the above embodiment. The direction in which the plurality of valve chambers of the control valves 510 to 540 are arranged may be different from the direction in which the drain flow path 360a extends. Similarly, the direction in which the plurality of valve chambers of the control valves 550 to 580 are arranged may be different from the direction in which the drain flow path 360b extends inside the cover 700b.

Further, in the above embodiment, the mode in which the drain flow path 360a formed inside the cover 700a and the drain flow path 360b formed inside the cover 700b communicate with each other inside the housing 100 has been described. The invention is not limited to the above embodiment. The position where the drain flow path 360a and the drain flow path 360b communicate with each other may be outside the housing 100.

Further, in the above embodiment, the drain flow path 360a formed inside the cover 700a and the drain flow path 360b formed inside the cover 700b are end portions in the respective cover 700 in the direction opposite to the D1 direction. Although the configurations for communicating with each other have been described in the above section, the present invention is not limited to the above embodiment. The position where the drain flow path 360a and the drain flow path 360b communicate with each other does not have to be the end portion in the direction opposite to the D1 direction. Further, the drain flow path 360a and the drain flow path 360b do not necessarily have to communicate with each other.

Further, in the above embodiment, the mode in which the pressure oil flow paths 330a and 330b and the drain flow paths 360a and 360b extend in the same direction has been described, but the present invention is not limited to the above embodiment. The pressure oil flow paths 330a and 330b and the drain flow paths 360a and 360b may extend in different directions.

Further, in the above embodiment, the pressure oil flow path 330a and the drain flow path 360a are formed in the same cover 700a, and the pressure oil flow path 330b and the drain flow path 360b are formed in the same cover 700b. Although the configuration has been described, the present invention is not limited to the above embodiment. The pressure oil flow path and the drain flow path may be formed in different members.

Further, in the above embodiment, the pressure oil from the hydraulic pumps 200a and 200b is supplied through the supply lines 310 and 320, and the supply lines 310 and 320 are branched at the positions of the control valves of the branched pressure oil. Pressure oil is supplied to each control valve by connecting the flow path to the port of each control valve. However, the present invention is not limited to the above embodiment, and the pressure oil supplied from the hydraulic pumps 200a and 200b is configured to be supplied to each control valve through a flow path other than the supply lines 310 and 320. May be good. For example, pressure oil may be supplied to each control valve through a center bypass line in which pressure oil is directly supplied to each control valve from the hydraulic pumps 200a and 200b. A flow path of the pressure oil as a center bypass line may be configured so as to supply the pressure oil to each control valve from the hydraulic pump 200a through the control valves 510 to 540 in order. Further, a flow path for the pressure oil as a center bypass line may be configured so that the pressure oil is supplied to each control valve from the hydraulic pump 200b through the control valves 550 to 580 in order.

Further, in the above embodiment, inside the housing 100, a control valve for controlling the drive of the boom, the arm and the bucket, and a control valve for controlling the turning operation of the cabin and the drive of the hydraulic motor for the traveling drive are provided. , The configurations provided for each were explained. However, the present invention is not limited to the above embodiment. The actuator whose drive is controlled by the control valve may have other configurations. For example, among the above actuators, a multi-control valve unit having some types of control valves may be used in order to control the drive of only some of the actuators. Further, a multi-control valve unit having a control valve for driving a type of actuator not used in the present embodiment may be used.

Further, in the above embodiment, a configuration in which four valve chambers and spools are arranged in a row inside the housing 100 (valve chamber row) and two spool rows are arranged has been described. However, the present invention is not limited to the above embodiment. The number of valve chambers and spools constituting the valve chamber row and spool row does not have to be four. It may be 5 or more, or 3 or less.

Further, in the above embodiment, the construction machine on which the multi-control valve unit 1000 is mounted is a hydraulic excavator, but the present invention is not limited to the above embodiment. The construction machine on which the multi-control valve unit of the present invention is mounted may be another type of construction machine such as a hydraulic crane.

Further, in the above embodiment, among the plurality of control valves in the multi-control valve unit 1000, one control valve (control valve 570) is provided with one electromagnetic proportional valve, and the other control valves have two. An electromagnetic proportional valve is provided. Therefore, in the present embodiment, among the plurality of control valves, some control valves are provided with a first proportional valve and a second proportional valve, and both the first proportional valve and the second proportional valve are on one side. It has a configuration provided on a cover arranged in. In this way, of the plurality of control valves, only some of the control valves are provided with the first proportional valve and the second proportional valve, and both the first proportional valve and the second proportional valve are arranged on one side. A multi-control valve unit having a configuration provided on the cover is also included in the present invention. In the above embodiment, in the multi-control valve unit, only a part of the plurality of control valves is provided with a first proportional valve and a second proportional valve, and the first proportional valve and the second proportional valve are provided. Although the embodiment having the configuration provided on the cover arranged on one side of the above has been described, the present invention is not limited to the above embodiment. Of the plurality of control valves in the multi-control valve unit, all control valves are provided with a first proportional valve and a second proportional valve, and both the first proportional valve and the second proportional valve are arranged on one side. It may have a configuration provided on the cover.

100 Housing 120a, 120b, 120c, 120d, 120e, 120f, 120g, 120h Spring chamber forming member (second pilot chamber forming member)
200a, 200b, 200c Hydraulic pump 330 Pressure oil flow path 360 Drain flow path 510, 520, 530, 540, 550, 560, 570, 580 Control valve 511, 521, 513, 541, 551, 561, 571, 581 Pilot chamber (1st pilot room)
511a, 521a, 513a, 541a, 551a, 561a, 581a flow paths (first pilot flow path)
512, 522, 532, 542, 552, 562, 582 Pilot room (second pilot room)
512a, 522a, 532a, 542a, 552a, 562a, 571a, 582a channels (second pilot channel)
513, 523, 533, 543, 535, 563, 573, 583 Electromagnetic proportional valve (first proportional valve)
514, 524, 534, 544, 554, 564, 574, 584 Electromagnetic proportional valve (second proportional valve)
515, 525, 535, 545, 555, 565, 575, 585 Spool 516, 526, 536, 546, 556, 566, 576, 586 Valve chamber 700 cover (first pilot chamber forming member)
1000 Multi-control valve unit 3000 Hydraulic excavator

Claims (7)

A housing with multiple valve chambers inside,
It is arranged so as to be movable in the axial direction inside each of the plurality of valve chambers, and by moving in the axial direction inside the valve chamber, the connection state between the plurality of ports can be switched and between the plurality of ports. Multiple spools that adjust the area of the communicating part,
A plurality of first pilot chambers for guiding the first pilot pressure to the first pilot pressure receiving portion on one side of each of the plurality of spools.
A plurality of second pilot chambers for guiding the second pilot pressure to the second pilot pressure receiving portion on the other side of each of the plurality of spools.
A first pilot chamber forming member arranged on one side of the housing so as to cover the plurality of first pilot chambers.
A plurality of springs arranged on the other side of the housing opposite to the one side so as to individually cover the plurality of second pilot chambers, and internally house a spring for urging the spool to a neutral position. The second pilot chamber forming member and
A plurality of first proportional valves and a plurality of second proportional valves provided in the first pilot chamber forming member,
A pressure oil flow path provided in the first pilot chamber forming member and connected to each of the plurality of first proportional valves and each of the plurality of second proportional valves.
A plurality of first pilot flow paths connecting the plurality of first proportional valves and the plurality of first pilot chambers, respectively.
A multi-control valve unit having a plurality of second pilot flow paths connecting the plurality of second proportional valves and the plurality of second pilot chambers, respectively. The plurality of valve chambers are arranged in a first direction orthogonal to the axial direction of the spool.
The multi-control valve unit according to claim 1, wherein the pressure oil flow path is formed inside the first pilot chamber forming member so as to extend in the first direction. A plurality of valve chamber rows in which the plurality of valve chambers are arranged in the first direction are arranged in a second direction intersecting the first direction.
The multi-control valve unit according to claim 2, wherein the pressure oil flow path is provided in each of the valve chamber rows, and the pressure oil flow paths provided in each of the valve chamber rows communicate with each other. The first pilot chamber forming member is connected to each of the plurality of first proportional valves and each of the plurality of second proportional valves, and is discharged from the plurality of first pilot chambers and the plurality of second pilot chambers. The multi-control valve unit according to any one of claims 1 to 3, wherein a drain flow path for guiding the pressure oil to be produced to the tank is provided. The plurality of valve chambers are arranged in a first direction orthogonal to the axial direction of the spool.
The multi-control valve unit according to claim 4, wherein the drain flow path is formed inside the first pilot chamber forming member so as to extend in the first direction. A plurality of valve chamber rows in which the plurality of valve chambers are arranged in the first direction are arranged in a second direction intersecting the first direction.
The multi-control valve unit according to claim 5, wherein the drain flow paths are provided in each of the valve chamber rows, and the drain flow paths provided in each of the valve chamber rows communicate with each other. A construction machine that controls the drive of an actuator by using the multi-control valve unit according to any one of claims 1 to 6.
The multi-control valve unit is a construction machine arranged at a position behind the cabin so that one side of the multi-control valve unit is located downward in the direction of gravity.

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