Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/20—Drives; Control devices
  • E02F9/22—Hydraulic or pneumatic drives
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K27/00—Construction of housing; Use of materials therefor

Definitions

• This disclosure relates to a multi-control valve that controls the flow of hydraulic fluid to an actuator, and a construction machine equipped with the same.
• Construction machinery such as excavators is equipped with multiple actuators such as a travel motor, a boom cylinder, and an arm cylinder, and performs various tasks by driving the multiple actuators.
• actuators such as a travel motor, a boom cylinder, and an arm cylinder
• One such construction machinery is disclosed in Patent Document 1.
• the construction machinery in Patent Document 1 is further equipped with two pumps, a tank, and a multi-control valve.
• the multi-control valve is connected to each of the two pumps, the tank, and the actuators, and drives each of the actuators by controlling the flow of hydraulic fluid to each of the actuators.
• the multi-control valve for construction machinery in Patent Document 1 includes a valve block through which a spool is slidably inserted.
• a plurality of ports are formed on each side of the valve block, and each port is connected to an actuator, pump, tank, etc. via piping or the like.
• the ports include a pump port connected to the pump, a tank port connected to the tank, and actuator ports which are ports connected to each of the actuators.
• the pump port and the tank port are arranged together on one side of the valve block, for example the rear surface, and the actuator ports are arranged side by side on the left and right side surfaces.
• the actuator ports are simply arranged side by side on the left and right sides, so to miniaturize the valve block, it is necessary to shorten the distance between the actuator ports. This causes the pipes connected to the actuator ports to interfere with each other, making it difficult to miniaturize the valve block.
• the present disclosure therefore aims to provide a multi-control valve that can achieve a compact valve block by adjusting the layout of each port, and a construction machine equipped with the same.
• the plurality of spool covers are provided on the first surface and the second surface, the first pump port and the first connection port are formed on the third surface, the second pump port and the second connection port are formed on the fourth surface, and the tank port and the third and fourth connection ports are formed on the fifth surface.
• the construction machine is equipped with the multi-control valve described above. Therefore, the installation space required for the multi-control valve in the construction machine can be reduced.
• the multi-control valve and construction machine disclosed herein can achieve a compact valve block by adjusting the layout of each port.
• FIG. 1 is a perspective view showing a construction machine according to the present disclosure.
• FIG. 1 is a plan view showing a construction machine according to the present disclosure.
• 2 is a circuit diagram showing a hydraulic circuit of a hydraulic drive device provided in a construction machine.
• FIG. 1 is a perspective view showing a multi-control valve provided in a hydraulic drive device according to a first embodiment of the present disclosure;
• FIG. 4 is a side view of the multi-control valve of FIG. 3 as viewed from one side in the height direction. 4 is a side view of the multi-control valve of FIG. 3 as viewed from the other side in the height direction.
• FIG. FIG. 4 is a perspective view of the multi-control valve of FIG. 3 as viewed from a different direction.
• FIG. 7 is a cross-sectional view of the multi-control valve of FIG. 6 taken along line AA. 7 is a cross-sectional view of the multi-control valve of FIG. 6 taken along line BB. 7 is a cross-sectional view of the multi-control valve of FIG. 6 taken along line CC. 7 is a cross-sectional view of the multi-control valve of FIG. 6 taken along line DD. 3 is an enlarged plan view of a multi-control valve provided in the construction machine of FIG. 2.
• FIG. 11 is a perspective view showing a multi-control valve provided in a hydraulic drive device according to a second embodiment of the present disclosure.
• FIG. 14 is a perspective view of the multi-control valve of FIG. 13 as viewed from a different direction.
• the construction machine 1 shown in FIG. 1 includes a multi-control valve 10 as shown in FIG. 2.
• the construction machine 1 is, for example, a shovel.
• the construction machine 1 may be a wheel loader, a crane, or the like.
• the construction machine 1 is configured, for example, as follows. That is, the construction machine 1 includes a traveling device 101, a revolving body 102, a boom 103, an arm 104, and a bucket 105 as shown in FIG. 1.
• the traveling device 101 includes, for example, a pair of crawlers 101L, 101R.
• the traveling device 101 may include a plurality of wheels instead of the pair of crawlers 101L, 101R. Each of the crawlers 101L, 101R can move in various directions by being driven.
• the second traveling spool 13 is connected to the second hydraulic pump 9. More specifically, the second traveling spool 13 is connected to the second main passage 32 via the second traveling passage 37 in which a check valve 37a is disposed, and is further connected to the second hydraulic pump 9 via the second main passage 32. The second traveling spool 13 is also connected to the tank passage 33. The second traveling spool 13 controls the flow of hydraulic fluid supplied to and discharged from the second traveling motor 3. More specifically, the second traveling motor 3 has a first supply and discharge port 3a and a second supply and discharge port 3b. The second traveling spool 13 is connected to the first supply and discharge port 3a via the first supply and discharge passage 38, and is connected to the second supply and discharge port 3b via the second supply and discharge passage 39.
• the rod side spool 20 for the second arm is connected to the first hydraulic pump 8. More specifically, the rod side spool 20 for the second arm is connected to the first main passage 31 via the second arm passage 46, and is further connected to the first hydraulic pump 8 via the first main passage 31. More specifically, the rod side spool 20 for the second arm is connected to the downstream side of the check valve 46a so as to be parallel to the head side spool 18 for the second arm in the second arm passage 46, and is connected to the first main passage 31 together with the head side spool 18 for the second arm via the check valve 46a. The rod side spool 20 for the second arm is also connected to the tank 30 via the tank passage 33.
• the rod side spool 20 for the second arm controls the flow of hydraulic fluid to the rod side port 6b of the arm cylinder 6. More specifically, the rod side spool 20 for the second arm is connected to the rod side passage 47 so as to be parallel to the rod side spool 19 for the first arm. The rod side spool 20 for the second arm is connected to the rod side port 6b via the rod side passage 47.
• the rod side spool 20 for the second arm receives pilot pressures output from the solenoid valves 20a and 20b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 20a and 20b.
• the rod side spool 20 for the second arm switches the connection destination of the rod side port 6b to either the first main passage 31 or the tank passage 33 by stroking.
• the rod side spool 20 for the second arm can supply hydraulic fluid from the first hydraulic pump 8 to the rod side port 6b of the arm cylinder 6, and discharge hydraulic fluid from the rod side port 6b of the arm cylinder 6 to the tank 30.
• the rod side spool 20 for the second arm adjusts its opening.
• the rod side spool 20 for the second arm controls the flow of hydraulic fluid supplied to and discharged from the rod side port 6b of the arm cylinder 6.
• the bucket head side spool 21 is connected to the head side port 7a via a head side passage 49.
• the bucket head side spool 21 receives pilot pressures output from the solenoid valves 21a, 21b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 21a, 21b.
• the bucket head side spool 21 switches the connection destination of the head side port 7a to either the first main passage 31 or the tank passage 33 by stroking. This allows the bucket head side spool 21 to supply hydraulic fluid from the first hydraulic pump 8 to the head side port 7a of the bucket cylinder 7, and to discharge hydraulic fluid from the head side port 7a of the bucket cylinder 7 to the tank 30.
• the bucket head side spool 21 also adjusts its opening. This allows the bucket head side spool 21 to control the flow rate of hydraulic fluid supplied to or discharged from the head side port 7a of the bucket cylinder 7.
• the bucket rod side spool 22 is connected to the first hydraulic pump 8. More specifically, the bucket rod side spool 22 is connected to the first main passage 31 via the bucket passage 48, and is further connected to the first hydraulic pump 8 via the first main passage 31. More specifically, the bucket rod side spool 22 is connected to the downstream side of the check valve 48a in parallel with the bucket head side spool 21 in the bucket passage 48, and is connected to the first main passage 31 together with the bucket head side spool 21 via the check valve 48a. The bucket rod side spool 22 is also connected to the tank 30 via the tank passage 33. The bucket rod side spool 22 controls the flow of hydraulic fluid to the rod side port 7b, which is the other port 7b in the bucket cylinder 7.
• the bucket rod side spool 22 is connected to the rod side port 7b via the rod side passage 50.
• the bucket rod side spool 22 receives pilot pressures output from the solenoid valves 22a and 22b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 22a and 22b.
• the bucket rod side spool 22 switches the connection destination of the rod side port 7b to either the first main passage 31 or the tank passage 33 by stroking.
• the bucket rod side spool 22 can supply hydraulic fluid from the first hydraulic pump 8 to the rod side port 7b of the bucket cylinder 7, or discharge hydraulic fluid from the rod side port 7b of the bucket cylinder 7 to the tank 30.
• the bucket rod side spool 22 also adjusts its opening. As a result, the bucket rod side spool 22 controls the flow of hydraulic fluid supplied to and discharged from the rod side port 7b of the bucket cylinder 7.
• the spools 21 and 22 also stroke independently of each other. Therefore, the spools 21 and 22 can independently control the flow of hydraulic fluid supplied to and discharged from the head side port 7a and rod side port 7b of the bucket cylinder 7. In other words, the spools 21 and 22 can independently control the meter-in flow rate and the meter-out flow rate for each of the head side port 7a and rod side port 7b of the bucket cylinder 7.
• the first swing spool 23 is connected to the second hydraulic pump 9. More specifically, the first swing spool 23 is connected to the second main passage 32 via the swing passage 51 in which the check valve 51a is interposed, and is further connected to the second hydraulic pump 9 via the second main passage 32.
• the first swing spool 23 is connected to the tank 30 via the tank passage 33.
• the first swing spool 23 controls the flow of hydraulic fluid to the first supply/discharge port 4a of the swing motor 4.
• the swing motor 4 has two ports 4a, 4b, and the first supply/discharge port 4a is one of the two ports 4a, 4b, 4a.
• the first swing spool 23 is connected to the first supply/discharge port 4a via the first supply/discharge passage 52.
• the first swing spool 23 receives pilot pressures output from the solenoid valves 23a and 23b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 23a and 23b.
• the first swing spool 23 switches the connection destination of the first supply/discharge port 4a to either the second main passage 32 or the tank passage 33 by stroking. This allows the first swing spool 23 to supply hydraulic fluid from the second hydraulic pump 9 to the first supply/discharge port 4a of the swing motor 4, and to discharge hydraulic fluid from the first supply/discharge port 4a of the swing motor 4 to the tank 30.
• the first swing spool 23 also adjusts its opening. This allows the first swing spool 23 to control the flow of hydraulic fluid supplied to and discharged from the first supply/discharge port 4a of the swing motor 4.
• the second spool holes 11c are formed on the second surface 11B of the block body 11a as shown in FIG. 6. More specifically, the second spool holes 11c are arranged in two rows on the second surface 11B of the block body 11a. In this embodiment, eight second spool holes 11c are formed on the second surface 11B of the block body 11a. The eight second spool holes 11c are arranged in two rows in the width direction, four on each side in the depth direction. In each row, the second spool holes 11c are aligned so that they are aligned in a row in the depth direction. In this embodiment, four second spool holes 11c are formed in each of the block members 11d and 11e. The eight second spool holes 11c extend in the height direction from the second surface 11B of the block body 11a.
• Each of the spools 12 and 13 forms an inner pilot chamber 12e, 13e at the bottom of the second spool hole 11c.
• Each of the spools 14, 15, 17, 18, 21, and 23 forms an inner pilot chamber 14e, 15e, 17e, 18e, 21e, and 23e between the second spool hole 11c and the partition wall 11f. Pilot pressure is introduced to each of the inner pilot chambers 12e to 24e, and each of the spools 12 to 24 receives the pilot pressure of the inner pilot chambers 12e to 24e in a direction away from the partition wall 11f (hereinafter referred to as "axially outward").
• the boom rod side spool 16, the second arm rod side spool 20, and the bucket rod side spool 22 are slidably inserted into the first spool holes 11b in the row on one side of the width direction, in that order from one side in the depth direction.
• the junction spool 25, the first arm rod side spool 19, and the second swivel spool 24 are slidably inserted into the first spool holes 11b in the row on the other side of the width direction, in that order from one side in the depth direction.
• the first traveling spool 12, the first boom head side spool 14, the second arm head side spool 18, and the bucket head side spool 21 are slidably inserted into the second spool holes 11c in the row on one side of the width direction, in that order from one side in the depth direction.
• the second travel spool 13, the second boom head side spool 15, the first arm head side spool 17, and the first swivel spool 23 are slidably inserted into the second spool holes 11c in the row on the other widthwise side, in that order from the one depthwise side.
• the spools 14 to 25 are arranged in the valve block 11 as follows. That is, the first boom head side spool 14, which is an example of a first spool, and the boom rod side spool 16 are slidably provided in the valve block 11 in correspondence with the boom cylinder 5, which is an example of a first actuator.
• the first boom head side spool 14 and the boom rod side spool 16 are slidably inserted into the corresponding first spool hole 11b and second spool hole 11c. Therefore, the boom rod side spool 16 and the first boom head side spool 14 are arranged in a row in the height direction so that their respective axes are aligned.
• first arm head side spool 17 and the first arm rod side spool 19, which are an example of a second spool, are slidably provided in the valve block 11 in correspondence with the arm cylinder 6, which is an example of a second actuator.
• the first arm head side spool 17 and the first arm rod side spool 19 are slidably inserted into corresponding first spool holes 11b and second spool holes 11c other than the above-mentioned spool holes 11b and 11c.
• the first arm head side spool 17 and the first arm rod side spool 19 are also arranged in a line in the height direction so that their respective axes coincide.
• the second arm head side spool 18 and the second arm rod side spool 20 are also slidably inserted into corresponding first spool holes 11b and second spool holes 11c in the same manner.
• the rod side spool 20 for the second arm and the head side spool 18 for the second arm are also aligned in the height direction so that their respective axes coincide.
• the bucket head side spool 21 and the bucket rod side spool 22 are provided in the valve block 11 in correspondence with the bucket cylinder 7, and the bucket head side spool 21 and the bucket rod side spool 22 are also arranged so that their axes coincide with each other. That is, the bucket head side spool 21 and the bucket rod side spool 22 are also slidably inserted into another corresponding first spool hole 11b and second spool hole 11c.
• the spool covers 12c to 25c are provided on the block body 11a so as to cover the openings of the spool holes 11b and 11c. That is, the spool covers 12c to 25c are provided on the block body 11a so as to cover the corresponding spools 12 to 25.
• the first surface 11A of the block body 11a is provided with the spool covers 16c, 19c, 20c, 24c, and 25c, respectively
• the second surface 11B of the block body 11a is provided with the spool covers 12c to 15c, 17c, 18c, 21c, and 23c, respectively.
• the spring mechanisms 12d to 25d are housed in the spool covers 12c to 25c, respectively.
• the spring mechanisms 12d to 25d are housed in the outer pilot chambers 12f to 25f, respectively.
• the spring mechanisms 12d to 25d correspond to the respective spools 12 to 25, and bias the corresponding spools 12 to 25. More specifically, the spring mechanisms 12d to 25d bias the spools 12 to 25 in the direction opposite to the direction in which the corresponding spools 12 to 25 stroke. This returns the spools 12 to 25 to their neutral positions.
• the first running passage 34 and the second running passage 37 are adjacent to the first running spool 12 and the second running spool 13, respectively, and are arranged on one side and the other side in the width direction.
• the first traveling passage 34 is connected to the first main passage 31 and the first traveling spool 12, and the second traveling passage 37 is connected to the second main passage 32 and the second traveling spool 13.
• the first and second supply and exhaust passages 35, 36 are connected to both axial sides of the first traveling passage 34, and the tank passage 33 is connected to the axial outside of these.
• the first and second supply and exhaust passages 35, 36 are connected to the first supply and exhaust port 2a and the second supply and exhaust port 2b, respectively, via the first and second supply and exhaust connection ports 35a, 36a that open on the fifth surface 11E of the valve block 11.
• the first and second supply and exhaust passages 38, 39 are connected to both axial sides of the second traveling passage 37, and the tank passage 33 is connected to the axial outside of these.
• the first and second supply and exhaust passages 38, 39 are connected to the first supply and exhaust port 3a and the second supply and exhaust port 3b, respectively, via the first and second supply and exhaust connection ports 38a, 39a that open on the fifth surface 11E of the valve block 11.
• the first boom passage 40 and the second boom passage 42 are arranged apart on one side and the other side in the width direction.
• the first boom passage 40 is arranged adjacent to the first boom head side spool 14 and the boom rod side spool 16.
• the first boom passage 40 is connected to the first main passage 31, and branches off from the first main passage 31 midway to connect to the first boom head side spool 14 and the boom rod side spool 16.
• a check valve 40a is interposed in the first boom passage 40 at the branching point.
• the first boom head side spool 14 is connected to the head side passage 41 and the tank passage 33 in this order axially outward from the first boom passage 40.
• the second boom passage 42 is disposed adjacent to the second boom head side spool 15.
• the second boom passage 42 is connected to the second main passage 32 and the second boom head side spool 15 with a check valve 42a interposed therebetween.
• the second boom head side spool 15 is also connected to the head side passage 41 and the tank passage 33 axially outward of the second boom passage 42.
• the junction passage 54 is disposed adjacent to the other widthwise side of the junction spool 25.
• the junction passage 54 connects the first main passage 31 and the second main passage 32 with the junction spool 25 interposed therebetween.
• the first arm passage 44 and the second arm passage 46 are arranged apart on one side and the other side in the width direction.
• the second arm passage 46 is arranged adjacent to the second arm head side spool 18 and the second arm rod side spool 20.
• the second arm passage 46 is connected to the first main passage 31, branches off from the first main passage 31 midway, and connects to the second arm head side spool 18 and the second arm rod side spool 20.
• a check valve 46a is interposed in the second arm passage 46 at the branching point.
• the head side passage 45 and the tank passage 33 are connected in this order to the second arm head side spool 18 axially outward from the second arm passage 46.
• the rod side passage 47 and the tank passage 33 are connected to the second arm rod side spool 20 axially outward from the second arm passage 46.
• the head side passage 45 extends in the width direction so as to straddle the two arm head side spools 18, 17.
• the head side passage 45 is connected to the head side port 5a of the arm cylinder 6 via head side connection ports 45a, 45b that open on the third and fourth faces 11C, 11D.
• the rod side passage 43 extends in the other width direction so as to straddle the first arm rod side spool 19.
• the rod side passage 47 is connected to the rod side port 5b of the arm cylinder 6 via a rod side connection port 47a that opens on the fourth face 11D.
• the first arm passage 44 is disposed adjacent to the first arm head side spool 17 and the first arm rod side spool 19.
• the first arm passage 44 is connected to the second main passage 32, and branches off from the second main passage 32 midway to connect to the first arm head side spool 17 and the first arm rod side spool 19.
• a check valve 44a is interposed in the first arm passage 44 at the branching point.
• the first arm head side spool 17 is connected to the head side passage 45 and the tank passage 33 in this order, axially outward from the first arm passage 44.
• the first arm rod side spool 19 is connected to the rod side passage 47 and the tank passage 33 in this order, axially outward from the first arm passage 44.
• the bucket passage 48 and the turning passage 51 are arranged apart on one side and the other side in the width direction.
• the bucket passage 48 is arranged adjacent to the bucket head side spool 21 and the bucket rod side spool 22.
• the bucket passage 48 is connected to the first main passage 31, and branches off from the first main passage 31 midway to connect to the bucket head side spool 21 and the bucket rod side spool 22.
• a check valve 48a is interposed in the bucket passage 48 at the branching point.
• the head side passage 49 and the tank passage 33 are connected in turn to the bucket head side spool 21 axially outward from the bucket passage 48.
• the rod side passage 50 and the tank passage 33 are connected in turn to the bucket rod side spool 22 axially outward from the bucket passage 48.
• the head side passage 49 is connected to the head side port 7a of the bucket cylinder 7 via a head side connection port 49a that opens on the third surface 11C.
• the rod side passage 50 is connected to the rod side port 7b of the bucket cylinder 7 via a rod side connection port 50a that opens on the third surface 11C.
• the swivel passage 51 is disposed adjacent to the first swivel spool 23 and the second swivel spool 24.
• the swivel passage 51 is connected to the second main passage 32, and branches off from the second main passage 32 midway to connect to the first swivel spool 23 and the second swivel spool 24.
• a check valve 51a is disposed in the swivel passage 51 at the branching point.
• the first supply and exhaust passage 52 and the tank passage 33 are connected in this order to the first swivel spool 23, axially outward from the swivel passage 51.
• the second supply and exhaust passage 53 and the tank passage 33 are connected in this order to the second swivel spool 24, axially outward from the swivel passage 51.
• the first supply and exhaust passage 52 is connected to the first supply and exhaust port 4a of the swivel motor 4 via the first supply and exhaust connection port 52a that opens on the fourth surface 11D.
• the second supply and exhaust passage 53 is connected to the second supply and exhaust port 4b of the rotation motor 4 via a second supply and exhaust connection port 53a that opens on the fourth surface 11D.
• the ports 31a, 32a, 33a, 33b, 35a, 36a, 38a, 39a, 41a, 41b, 43a, 45a, 45b, 47a, 49a, 50a, 52a, and 53a are formed as follows: That is, on the third face 11C, as shown in Fig. 7, the first pump port 31a, the head side connection port 41a and the rod side connection port 43a connected to the boom cylinder 5, the head side connection port 45a connected to the arm cylinder 6, and the head side connection port 49a and the rod side connection port 50a connected to the bucket cylinder 7 are formed.
• the first pump port 31a, the head side connection port 41a, and the rod side connection port 43a are formed in the first block member 11d, and the head side connection port 45a, the head side connection port 49a, and the rod side connection port 50a are formed in the second block member 11e.
• the pump port 31a and the connection ports 41a, 43a, 45a, 49a, and 50a are formed in the third surface 11C as follows.
• the first pump port 31a is disposed on one side of the depth direction on the third surface 11C relative to the other connection ports 41a, 43a, 45a, 49a, and 50a.
• the head side connection port 41a and the rod side connection port 43a are arranged in the height direction and disposed on the other side of the depth direction relative to the first pump port 31a.
• the rod side connection port 43a and the head side connection port 41a are disposed so as to be spaced apart on one and the other sides in the height direction such that the check valve 40a is located between them.
• the head side connection port 45a is disposed on the other side in the depth direction than the head side connection port 41a and the rod side connection port 43a.
• the head side connection port 45a is disposed closer to the other side in the depth direction, i.e., the other side in the height direction, than the rod side connection port 43a.
• the head side connection port 49a and the rod side connection port 50a are disposed on the other side in the depth direction than the head side connection port 45a.
• the rod side connection port 50a and the head side connection port 49a are disposed so as to be spaced apart on one side and the other side in the height direction such that the check valve 48a is located between them.
• the fourth surface 11D is formed with the second pump port 32a, the head side connection port 41b connected to the boom cylinder 5, the head side connection port 45b and the rod side connection port 47a connected to the arm cylinder 6, and the first supply/exhaust connection port 52a and the second supply/exhaust connection port 53a connected to the rotation motor 4.
• the second pump port 32a and the head side connection port 41b are formed in the first block member 11d of the fourth surface 11D
• the head side connection port 45b, the rod side connection port 47a, the first supply/exhaust connection port 52a, and the second supply/exhaust connection port 53a are formed in the second block member 11e.
• the pump port 32a and each connection port 41b, 45b, 47a, 52a, 53a are formed on the fourth surface 11D in the following manner in this embodiment.
• the second pump port 32a is disposed on one side of the depth direction of the other connection ports 41b, 45b, 47a, 52a, and 53a on the fourth surface 11D.
• the head side connection port 41b is disposed on the other side of the depth direction of the second pump port 32a.
• a check valve 42a is disposed on the other side of the depth direction of the second pump port 32a, and the head side connection port 41b is disposed on the other side of the height direction of the check valve 42a.
• a counterweight (not shown) is placed at the rearmost side, and in front of that, the drive source E and the two hydraulic pumps 8, 9 are placed side by side in the left-right direction (in a row in this embodiment).
• the rotating body 102 has a cabin 102a on its front left side, and the drive source E and the two hydraulic pumps 8, 9 are placed between the cabin 102a and the counterweight in the fore-and-aft direction.
• a boom 103 is provided on the rotating body 102 in a swingable manner at the front side, in the middle part in the left-right direction.
• the multi-control valves 10 are arranged behind the boom 103 so as to be adjacent to each other within the rotating body 102.
• the multi-control valves 10 are arranged within the rotating body 102 so that their height, width, and depth directions correspond to the up-down, left-right, and front-to-rear directions of the construction machine 1, respectively.
• the first surface 11A and the second surface 11B of the multi-control valve 10 face in the up-down direction, respectively
• the third and fourth surfaces 11C, 11D face in the right-hand and left-hand directions, respectively
• the fifth and sixth surfaces 11E, 11F face in the front-to-rear direction, respectively.
• various pipes 61-64, 71-84 are provided on each surface 11C, 11D, 11E of the multi-control valve 10.
• the first and second pump pipes 61, 62 are provided on the third and fourth surfaces 11C, 11D, respectively, and are connected to the pump ports 31a, 32a.
• the first and second pump pipes 61, 62 extend from the third and fourth surfaces 11C, 11D, respectively, toward the first and second hydraulic pumps 8, 9, respectively, and are connected to the first and second hydraulic pumps 8, 9, respectively.
• the first and second tank pipes 63, 64 are provided on the fifth surface 11E, and are connected to the tank ports 33a, 33b.
• the first and second tank pipes 63, 64 extend from the fifth surface 11E toward the tank 30, and are connected to the tank 30.
• the actuator pipes 71-74 are provided on the fifth surface 11E and are connected to the supply and exhaust connection ports 35a, 36a, 38a, and 39a, respectively.
• the actuator pipes 71-74 extend from the fifth surface 11E toward the travel motors 2 and 3 and are connected to the ports 2a, 2b, 3a, and 3b of the travel motors 2 and 3.
• the actuator pipes 71-74 are arranged inside the travel device 101 through a swivel joint (not shown) attached to the travel device 101 from the fifth surface 11E, and are connected to the ports 2a, 2b, 3a, and 3b, respectively.
• the other actuator pipes 75-84 are provided on the third and fourth faces 11C and 11D, respectively, and are connected to the connection ports 41a, 41b, 43a, 45a, 45b, 47a, 49a, 50a, 52a, and 53a.
• the actuator pipes 75-84 extend from the fifth face 11E toward the actuators 4-7, and are connected to the ports 4a-7a, 4b-7b of the actuators 4-7.
• the pump ports 31a, 32a and the tank ports 33a, 33b are arranged rearward of the connection ports 41a, 41b, 43a, 45a, 45b, 47a, 49a, 50a, 52a, 53a that are connected to the actuators 4 to 7. Therefore, when laying out the pipes 61 to 64, 75 to 84, it is possible to prevent the pipes 61 to 64, 75 to 84 from interfering with each other. This makes it easier to arrange the pipes 61 to 64, 75 to 84.
• the supply and discharge connection ports 35a, 36a, 38a, and 39a are arranged on the other side of the height direction of the fifth surface 11E, that is, toward the lower side of the construction machine 1, so that they can be arranged close to the traveling device 101. Therefore, it is possible to prevent the pipes 71 to 74 from interfering with the other pipes 61 to 64 and 75 to 84, so that the layout of the pipes 61 to 64 and 71 to 84 can be made easier.
• the fifth surface 11E of the multi-control valve 10 is arranged close to the pivot axis L1 and is arranged adjacent to the swivel joint arranged along the pivot axis L1. Therefore, it is possible to further prevent the pipes 71 to 74 from interfering with the other pipes 61 to 64 and 75 to 84, so that the layout of the pipes 61 to 64 and 71 to 84 can be made even easier.
• the hydraulic drive unit 100 is controlled as follows. That is, when the traveling device 101 is driven, pilot pressure is output from at least one of the solenoid valves 12a, 12b, 13a, and 13b. For example, when pilot pressure is output from the first solenoid valves 12a and 13a, the pilot pressure is introduced to the inner pilot chambers 12e and 13e, and the traveling spools 12 and 13 are operated, respectively. As a result, hydraulic fluid is supplied from the hydraulic pump 8 to the first traveling motor 2 via the first traveling spool 12, and from the hydraulic pump 9 to the second traveling motor 3 via the second traveling spool 13. As a result, the traveling device 101 is driven.
• pilot pressure is output from one of the solenoid valves 23a, 23b, 24a, and 24b.
• the pilot pressure is guided to the pilot chambers 23f and 24e, and the rotation motor 4 is operated.
• the hydraulic fluid is supplied from the hydraulic pump 8 to the first supply and discharge port 4a via the first rotation spool 23, and the hydraulic fluid is further discharged from the second supply and discharge port 4b to the tank 30 via the second rotation spool 24.
• the first rotation spool 23 and the second rotation spool 24 can stroke independently, and the opening degree of each can be adjusted independently. Therefore, in the multi-control valve 10, the flow rate flowing through the first supply and discharge port 4a and the second supply and discharge port 4b can be controlled independently, and more precise control of the rotation motor 4 can be performed.
• pilot pressure is output from the solenoid valves 14b and 16a. Then, pilot pressure is guided to the pilot chambers 14f and 16e. As a result, hydraulic fluid from the first hydraulic pump 8 is guided to the head side port 5a, and the boom cylinder 5 is extended. Also, when a large flow rate needs to be flowed through the head side port 5a of the boom cylinder 5, pilot pressure is also output from the solenoid valve 15b. Then, pilot pressure is guided to the pilot chamber 15f, and hydraulic fluid from the second hydraulic pump 9 is also guided to the head side port 5a of the boom cylinder 5 via the second boom head side spool 15.
• pilot pressure is output from the solenoid valves 17b and 19a. Then, pilot pressure is guided to the pilot chambers 17f and 19e. As a result, the hydraulic fluid of the second hydraulic pump 9 is guided to the head side port 6a, and the arm cylinder 6 is extended. Also, when a large flow rate needs to be flowed through the head side port 6a of the arm cylinder 6, pilot pressure is also output from the solenoid valves 18b and 20a. Then, pilot pressure is guided to the pilot chambers 18f and 20e, and the hydraulic fluid from the first hydraulic pump 8 can also be guided to the head side port 6a of the arm cylinder 6 through the second arm head side spool 18.
• pilot pressure is output from the solenoid valves 17a and 19b. Then, pilot pressure is guided to the pilot chambers 17e and 19f, and the arm cylinder 6 is retracted. Furthermore, pilot pressure is output from solenoid valves 18a and 20b, allowing a larger flow rate of hydraulic fluid to flow to the rod side port 6b of the arm cylinder 6.
• pilot pressure is output from the solenoid valves 21b and 22a. This leads to pilot pressure being introduced into the pilot chambers 21f and 22e, and the bucket cylinder 7 is extended.
• pilot pressure is output from the solenoid valves 21b and 22a. This leads to pilot pressure being introduced into the pilot chambers 21e and 22f, and the bucket cylinder 7 is contracted.
• pilot pressure is output from the solenoid valve 26a. This allows the hydraulic fluid discharged from the head side port 5a of the boom cylinder 5 to be regenerated in the arm cylinder 6 via the boom regeneration valve body 26.
• the first pump port 31a and the connection ports 41a and 43a of the boom cylinder 5 are formed on the third surface 11C
• the second pump port 32a and the connection ports 45b and 47a of the arm cylinder 6 are formed on the fourth surface 11D.
• the tank port 33a, the connection ports 35a and 36a of the first travel motor 2, and the connection ports 38a and 39a of the second travel motor 3 are formed on the fifth surface 11E. Therefore, the connection ports 35a, 36a, 38a, 39a, 41a, 43a, 45b, and 47a can be formed in a distributed manner on the third surface 11C, the fourth surface 11D, and the fifth surface 11E. This allows the valve block 11 to be made smaller. That is, the layout of the ports 35a, 36a, 38a, 39a, 41a, 43a, 45b, and 47a allows the valve block 11 to be made smaller.
• the third surface 11C has a first pump port 31a formed on one side in the depth direction from the connection ports 41a, 43a of the boom cylinder 5, and the fourth surface 11D has a second pump port 32a formed on one side in the depth direction from the connection ports 45b, 47a of the arm cylinder 6. Therefore, the tank port 33a and the two pump ports 31a, 32a can be arranged on one side in the depth direction, and the connection ports 41a, 43a, 45b, 47a can be arranged on the other side in the depth direction. This makes it possible to prevent the layout of the pipes 61-64, 75, 77, 78, 80 that respectively connect the first and second hydraulic pumps 8, 9, the tank 30, and the boom cylinder 5 and arm cylinder 6 to the multi-control valve 10 from becoming complicated.
• the fifth surface 11E has a tank port 33a formed on one side in the height direction, and connection ports 35a, 36a, 38a, 39a formed on the other side in the height direction. Therefore, it is possible to prevent the layout of the pipes 63, 64 connecting the multi-control valve 10 and the tank 30, and the pipes 71-74 connecting the multi-control valve 10 and the first and second travel motors 2, 3 from interfering with each other. For example, by arranging the multi-control valve 10 on the construction machine 1 so that the travel device 101 is located on the other side in the height direction, it is possible to prevent the pipes 71-74 from extending toward the pipes 63, 64. Therefore, it is possible to further prevent the pipes 71-74 from interfering with the pipes 63, 64.
• the third surface 11C is formed with the first pump port 31a between the tank port 33a and the connection ports 35a, 36a, 38a, 39a as viewed from one side in the depth direction, and on one side in the depth direction of the connection ports 41a, 43a of the boom cylinder 5.
• the fourth surface 11D is formed with the second pump port 32a between the tank port 33a and the connection ports 35a, 36a, 38a, 39a as viewed from one side in the height direction, and on one side in the depth direction of the connection ports 45b, 47a of the arm cylinder 6.
• the heightwise positions of the pipes 61 to 64, 71 to 74 that respectively connect the tank 30, the first and second hydraulic pumps 8, 9, and the first and second travel motors 2, 3 to the multi-control valve 10 can be shifted. Therefore, the layout of the pipes 61 to 64, 71 to 74 can further suppress interference between them.
• connection ports 35a, 36a, 38a, and 39a are arranged side by side in the width direction. Therefore, the valve block 11 can be made compact in the height direction.
• the first boom head side spool 14 and the boom rod side spool 16 are arranged so that their respective axes coincide, and the first arm head side spool 17 and the first arm rod side spool 19 are also arranged so that their respective axes coincide. That is, the first boom head side spool 14 and the boom rod side spool 16 are arranged in a row in the height direction, and the first arm head side spool 17 and the first arm rod side spool 19 are also arranged in a row in the height direction. Therefore, the valve block 11 can be made compact in the width and depth directions.
• connection ports 41a, 43a of the boom cylinder 5 are ports connected to the boom cylinder 5, and the connection ports 45b, 47a of the arm cylinder 6 are ports connected to the arm cylinder 6.
• the third surface 11C is further provided with connection ports 49a, 50a connected to the bucket cylinder 7, and the fourth surface 11D is provided with connection ports 52a, 53a connected to the swing motor 4. Therefore, the multi-control valve 10 can control the flow of hydraulic fluid to each actuator 4 to 7 of the construction machine 1.
• the bucket head side spool 21 is arranged adjacent to the first swing spool 23 in the width direction, and the bucket rod side spool 22 is arranged adjacent to the second swing spool 24 in the width direction. Therefore, the four spools 21 to 24 are arranged on a single imaginary plane perpendicular to the depth direction, so the valve block 11 can be formed compactly.
• the multi-control valve 10 is provided in the rotating body 102 so that the third and fourth faces 11C, 11D face to the right and left, respectively. This allows the pipes 75-77 connected to the connection ports 41a, 41b, 43a to be positioned so that they extend forward from the third and fourth faces 11C, 11D, making it easier to lay out the pipes 75-77.
• the first and second hydraulic pumps 8, 9 are arranged rearward of the multi-control valve 10.
• the third surface 11C has a first pump port 31a formed on one side in the depth direction of the connection ports 41a, 43a of the boom cylinder 5
• the fourth surface 11D has a second pump port 32a formed on one side in the depth direction of the connection ports 45b, 47a of the arm cylinder 6.
• the multi-control valve 10 is arranged so that the fifth surface 11E faces rearward. Therefore, the first and second pump ports 31a, 32a can be arranged closer to the first and second hydraulic pumps 8, 9 than the connection ports 41a, 43a, 45b, 47a.
• [Second embodiment] 13 and 14 is provided in the construction machine 1 like the multi-control valve 10 of the first embodiment, and has a configuration similar to that of the multi-control valve 10 of the first embodiment. Therefore, the configuration of the multi-control valve 110 of the second embodiment will be mainly described in terms of the differences from the multi-control valve 10 of the first embodiment, and the same components will be denoted by the same reference numerals and description thereof will be omitted.
• the multi-control valve 110 includes a valve block 111 and a plurality of spools 12 to 25. As shown in FIG. 13 and FIG. 14, in the valve block 111, the first and second supply and exhaust connection ports 35a, 136a connected to the first travel motor 2, and the first and second supply and exhaust connection ports 38a, 139a connected to the second travel motor 3 are arranged as follows.
• the first supply and exhaust connection ports 35a, 38a connected to the travel motors 2, 3, respectively, are arranged on the fifth surface 11E.
• the second supply and exhaust connection port 136a connected to the first travel motor 2 is arranged on the third surface 11C, and the second supply and exhaust connection port 139a connected to the second travel motor 3 is arranged on the fourth surface 11D.
• the first supply and exhaust connection ports 35a, 38a connected to the motors 2, 3 are formed on the fifth surface 11E.
• the second supply and exhaust connection port 36a connected to the first travel motor 2 is formed on the third surface 11C
• the second supply and exhaust connection port 39a connected to the second travel motor 3 is formed on the fourth surface 11D. Therefore, it is possible to prevent the pipes connected to the first supply and exhaust connection ports 35a, 38a, respectively, from interfering with the second supply and exhaust connection ports 136a, 139a.
• the first and second supply/exhaust connection ports 35a, 136a are ports connected to the first travel motor 2, and the first and second supply/exhaust connection ports 38a, 139a are ports connected to the second travel motor 3. Therefore, the layout of the piping connecting the multi-control valve 110 to the tank 30, and the piping connecting the multi-control valve 110 to the first and second travel motors 2, 3, respectively, can be designed to prevent interference with each other.
• the boom cylinder 5 is given as an example of the first actuator, but the first actuator may be the swing motor 4, the arm cylinder 6, and the bucket cylinder 7.
• the arm cylinder 6 is given as an example of the second actuator, but the second actuator may be the swing motor 4, the boom cylinder 5, and the bucket cylinder 7.
• the multi-control valve 10 does not necessarily have to be provided in the construction machine 1, and may be provided in other industrial machines.
• the first pump port and the first connection port are formed on the third surface, and the second pump port and the second connection port are formed on the fourth surface. Furthermore, the tank port and the third and fourth connection ports are formed on the fifth surface. Therefore, the ports connected to the actuator can be formed in a distributed manner on the third to fifth surfaces. This allows the valve block to be made smaller. In other words, the layout of each port can achieve a smaller valve block.
• the first pump port is formed on the third surface between the tank port and the third and fourth connection ports as viewed from one side in the third direction, and on one side in the third direction from the first connection port.
• the second pump port is formed on the fourth surface between the tank port and the third and fourth connection ports as viewed from one side in the third direction, and on one side in the third direction from the second connection port. Therefore, with regard to the layout of the piping connecting the tank, the first and second pumps, and the third and fourth actuators to the multi-control valve, interference between them can be further suppressed.
• the multiple spools include two first spools provided in the valve block corresponding to the first actuator and two second spools provided in the valve block corresponding to the second actuator, the two first spools are arranged so that their respective axes coincide, and the two second spools are arranged so that their respective axes coincide.
• the two first spools are arranged so that their respective axes coincide, and the two second spools are arranged so that their respective axes coincide. That is, the two first spools are arranged in a line in the first direction, and the two second spools are also arranged in a line in the first direction. Therefore, the valve block can be made compact in the second and third directions.
• the first connection port is a port for a boom cylinder
• the second connection port is a port for an arm cylinder
• a bucket port is further formed on the third surface
• a swing port is formed on the fourth surface. Therefore, the multi-control valve can control the flow of hydraulic fluid to each actuator of the construction machine. Therefore, it is possible to provide a multi-control valve that can be mounted on a construction machine and that can achieve a compact valve block by arranging each port.
• the multiple spools include two boom spools provided in the valve block corresponding to the boom cylinder and two arm spools provided in the valve block corresponding to the arm cylinder, the two boom spools are arranged so that their respective axes coincide, and the two arm spools are arranged so that their respective axes coincide.
• the two boom spools are arranged so that their respective axes coincide, and the two arm spools are arranged so that their respective axes coincide. That is, the two boom spools are arranged in a row in the first direction, and the two arm spools are also arranged in a row in the first direction.
• the passages related to the boom cylinder can be arranged compactly
• the passages related to the arm cylinder can be arranged compactly. This also allows the valve block to be made compact.
• the multiple spools include two bucket spools provided in the valve block corresponding to the bucket cylinder and two swivel spools provided in the valve block corresponding to the swivel motor, the two bucket spools are arranged so that their respective axes coincide, the two swivel spools are arranged so that their respective axes coincide, one of the two bucket spools is arranged so that it is adjacent to one of the two swivel spools in the second direction, and the other of the two bucket spools is arranged so that it is adjacent to the other of the two swivel spools in the second direction.
• one of the two third connection ports is formed on the fifth surface, and the other of the two third connection ports is formed on the third surface.
• one of the two fourth connection ports is formed on the fifth surface, and the other of the two fourth connection ports is formed on the fourth surface. Therefore, it is possible to prevent the pipes connected to the two third connection ports from interfering with each other. Similarly, it is possible to prevent the pipes connected to the two fourth connection ports from interfering with each other.
• the two third connection ports in the multi-control valve of the tenth aspect are ports connected to a first travel motor provided on a travel device of a construction machine, and the two fourth connection ports are ports connected to a second travel motor provided on the travel device.
• the construction machine is equipped with the aforementioned multi-control valve. Therefore, the installation space required for the multi-control valve in the construction machine can be reduced.
• the construction machine of the 13th aspect further includes the first and second pumps arranged on the rotating body rearward of the multi-control valve, the first pump port is formed on the third surface on one side in the third direction from the first connection port, the second pump port is formed on the fourth surface on one side in the third direction from the second connection port, and the multi-control valve is arranged so that the fifth surface faces rearward.
• the tank is disposed to the side of the multi-control valve on the rotating body, and the multi-control valve is disposed so that its fifth surface faces rearward. Therefore, the tank port and the tank can be easily attached by extending the piping from the tank port to the side.

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• 2025
  • 2025-01-09 JP JP2025569425A patent/JPWO2025150545A1/ja active Pending
  • 2025-01-09 WO PCT/JP2025/000565 patent/WO2025150545A1/ja active Pending

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