Classifications

• • 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

• the present disclosure relates to a multi-control valve having a valve block through which multiple spools are slidably inserted.
• first to third pilot chambers are formed on both axial sides of the spool hole and between the two spools.
• the spools can stroke axially inward independently of each other. That is, each spool controls the flow of hydraulic fluid to each supply and discharge port independently of each other.
• pilot pressure is input to the third pilot chamber
• the two spools both receive pilot pressure and therefore stroke together in directions away from each other. Therefore, when pilot pressure is input to the third pilot chamber, it is difficult for the two spools to control the flow of hydraulic fluid independently of each other.
• FIG. 5 is a cross-sectional view of the multi-control valve of FIG. 4 taken along line CC. 5 is a cross-sectional view of the multi-control valve of FIG. 4 taken along line DD.
• FIG. 2 is a side view showing a partition member of the multi-control valve of FIG. 1 .
• FIG. 11 is a perspective view showing a multi-control valve according to a second embodiment of the present disclosure.
• FIG. 12 is a side view of the multi-control valve of FIG. 11 as viewed from one side in the width direction. 12 is a cross-sectional view of the multi-control valve of FIG. 11 taken along line C1-C1.
• FIG. 13 is a perspective view showing a multi-control valve according to a third embodiment of the present disclosure.
• FIG. 13 is a perspective view showing a multi-control valve according to a third embodiment of the present disclosure.
• 15 is a circuit diagram showing a hydraulic circuit formed in the multi-control valve of FIG. 14 .
• 15 is a cross-sectional view of the multi-control valve of FIG. 14 taken along line E-E.
• 15 is a cross-sectional view of the multi-control valve of FIG. 14 taken along line FF.
• FIG. 11 is a cross-sectional view showing a multi-control valve according to another embodiment of the present disclosure.
• the multi-control valve 1 is, for example, a multi-control valve of a two-pump system, and is connected to two hydraulic pumps 8 and 9.
• the multi-control valve 1 is supplied with hydraulic fluid from the two hydraulic pumps 8 and 9.
• the multi-control valve 1 is also connected to a plurality of actuators 2 to 7.
• the multi-control valve 1 controls the flow of hydraulic fluid to the plurality of actuators 2 to 7. That is, the multi-control valve 1 controls the direction (i.e., flow direction) of the hydraulic fluid supplied to and discharged from the plurality of actuators 2 to 7, and the flow rate of the hydraulic fluid supplied and discharged.
• the multi-control valve 1 can independently control the flow rate of the hydraulic fluid supplied to and discharged from each of the swing motor 4, the boom cylinder 5, the arm cylinder 6, and the bucket cylinder 7.
• the multi-control valve 1 configured in this manner includes a valve block 11 and a plurality of spools 12 to 25, as shown in FIG. 3 and FIG. 4.
• the multi-control valve 1 includes 14 spools 12 to 25.
• the number of spools 12 to 25 provided in the multi-control valve 1 is not limited to 14, and may be 13 or less or 15 or more.
• the multi-control valve 1 further includes a boom regeneration valve element 26, which will be described in detail later.
• the valve block 11 is formed, for example, in a rectangular parallelepiped shape as shown in Figures 1 and 5.
• the valve block 11 is formed in a rectangular shape when viewed in a plan view from one side in the height direction.
• the valve block 11 has various passages 31 to 50, which will be described in detail later.
• the valve block 11 also has pump ports 31a, 32a on each side at d perpendicular to the height direction. Each of the pump ports 31a, 32a is connected to each of the hydraulic pumps 8, 9.
• the valve block 11 also has a tank port 33a on the top surface on one side in the height direction.
• the tank 10 is connected to the tank port 33a. Furthermore, the valve block 11 has multiple actuator ports 37a, 37b, 39a, 41a, 41b, 43a, 45a, 46a, 48a, and 49a on each side in the depth direction. Multiple actuators 4 to 7 are connected to each of the actuator ports 37a, 37b, 39a, 41a, 41b, 43a, 45a, 46a, 48a, and 49a.
• Each of the spools 12 to 25, which will be described in more detail, is associated with each of the actuators 2 to 7 and controls the flow of hydraulic fluid supplied to and discharged from the corresponding actuator 2 to 7.
• the spools 12 to 25 include a first traveling spool 12, a second traveling spool 13, a first arm head side spool 14, a second arm head side spool 15, a first arm rod side spool 16, a second arm rod side spool 17, a first boom head side spool 18, a second boom head side spool 19, a boom rod side spool 20, a bucket head side spool 21, a bucket rod side spool 22, a first swivel spool 23, a second swivel spool 24, and a junction spool 25.
• Each of the spools 12 to 25 is slidably inserted into the valve block 11, as described in detail below.
• the spools 12 to 25 are slidably inserted into the valve block 11 in the width direction, which is an example of a first direction.
• the width direction is a direction perpendicular to the height direction and the depth direction.
• the spools 12 to 25 control the flow of hydraulic fluid by stroking.
• the multi-control valve 1 also includes a number of solenoid valves 12a-24a, 12b-25b, as shown in Figures 1 and 5.
• Each of the solenoid valves 12a-24a, 12b-25b is provided in the valve block 11 in correspondence with each of the spools 12-25 (see, for example, Figures 3 and 4).
• Each of the solenoid valves 12a-24a, 12b-25b outputs a pilot pressure to the corresponding spool 12-25 in response to an input signal.
• each of the solenoid valves 12a-24a, 12b-25b strokes the corresponding spool 12-25.
• the following hydraulic circuit 1a is formed.
• the valve block 11 has two main passages 31, 32 and a tank passage 33.
• Each of the main passages 31, 32 has a pump port 31a, 32a (see also FIG. 6).
• the first main passage 31 is connected to a first hydraulic pump 8 via a first pump port 31a
• the second main passage 32 is connected to a second hydraulic pump 9 via a second pump port 32a.
• the first main passage 31 is connected to the spools 12, 14, 16, 18, 20, 21, and 22 in parallel.
• the second main passage 32 is connected to the spools 13, 15, 17, 19, 23, and 24 in parallel.
• the tank passage 33 is connected to the tank 10.
• Each of the spools 12 to 25 will be described below in more detail.
• the first traveling spool 12 is connected to the first main passage 31. More specifically, the first traveling spool 12 is connected to the first main passage 31 via the first traveling passage 34 in which the check valve 34a is interposed. The first traveling spool 12 is also connected to the tank passage 33. The first traveling spool 12 controls the flow of hydraulic fluid supplied to and discharged from the first traveling motor 2. More specifically, the first traveling motor 2 has a first supply/discharge port 2a and a second supply/discharge port 2b. The first traveling spool 12 is connected to the first supply/discharge port 2a and the second supply/discharge port 2b of the first traveling motor 2.
• the first traveling spool 12 receives pilot pressures output from the solenoid valves 12a and 12b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 12a and 12b.
• the first traveling spool 12 switches the connection destinations of the supply/discharge ports 2a, 2b to the first main passage 31 and the tank passage 33, respectively, by stroking, and adjusts the opening degree of the first traveling spool 12. In this way, the first traveling spool 12 controls the flow of hydraulic fluid to the first supply/discharge port 2a and the second supply/discharge port 2b of the first traveling motor 2.
• the second traveling spool 13 is connected to the second main passage 32. More specifically, the second traveling spool 13 is connected to the second main passage 32 via the second traveling passage 35 in which the check valve 35a is disposed. 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 and the second supply and discharge port 3b of the second traveling motor 3.
• the second traveling spool 13 receives pilot pressures output from the solenoid valves 13a, 13b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 13a, 13b.
• the second traveling spool 13 switches the connection destination of each supply/discharge port 3a, 3b to the second main passage 32 and the tank passage 33, respectively, by stroking, and adjusts the opening degree of the second traveling spool 13.
• the second traveling spool 13 controls the flow of hydraulic fluid to the first supply/discharge port 3a and the second supply/discharge port 3b of the second traveling motor 3.
• the head side spool 15 for the second arm is connected to the second main passage 32. More specifically, the head side spool 15 for the second arm is connected to the second main passage 32 via the second arm passage 38 in which the check valve 38a is interposed. The head side spool 15 for the second arm is also connected to the tank passage 33. The head side spool 15 for the second arm controls the flow of hydraulic fluid supplied to and discharged from the arm cylinder 6. More specifically, the head side spool 15 for the second arm is connected to the head side port 6a via the head side passage 37 so as to be parallel to the head side spool 14 for the first arm.
• the head side spool 15 for the second arm receives pilot pressures output from the solenoid valves 15a, 15b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 15a, 15b.
• the second arm head side spool 15 switches the connection destination of the head side port 6a to either the second main passage 32 or the tank passage 33 by stroking, and also adjusts the opening degree of the second arm head side spool 15. In this way, the second arm head side spool 15 controls the flow of hydraulic fluid supplied to and discharged from the head side port 6a of the arm cylinder 6.
• the first arm rod side spool 16 is connected to the first main passage 31. More specifically, the first arm rod side spool 16 is connected to the first main passage 31 via the first arm passage 36. More specifically, the first arm rod side spool 16 is connected to the downstream side of the check valve 36a in parallel with the first arm head side spool 14 in the first arm passage 36, and is connected to the first main passage 31 together with the first arm head side spool 14 via the check valve 36a. The first arm rod side spool 16 is also connected to the tank passage 33. The first arm rod side spool 16 controls the flow of hydraulic fluid supplied to and discharged from the arm cylinder 6. More specifically, the first arm rod side spool 16 is connected to the rod side port 6b via the rod side passage 39.
• the first arm rod side spool 16 receives pilot pressures output from the solenoid valves 16a, 16b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 16a, 16b. By stroking, the first arm rod side spool 16 switches the connection destination of the rod side port 6b to either the first main passage 31 or the tank passage 33, and adjusts the opening of the first arm rod side spool 16. As a result, the first arm rod side spool 16 controls the flow of hydraulic fluid supplied to and discharged from the rod side port 6b of the arm cylinder 6.
• the rod side spool 17 for the second arm is connected to the second main passage 32. More specifically, the rod side spool 17 for the second arm is connected to the second main passage 32 via the second arm passage 38. More specifically, the rod side spool 17 for the second arm is connected to the downstream side of the check valve 38a so as to be parallel to the head side spool 15 for the second arm in the second arm passage 38, and is connected to the second main passage 32 together with the head side spool 15 via the check valve 38a.
• the rod side spool 17 for the second arm is also connected to the tank passage 33. The rod side spool 17 for the second arm controls the flow of hydraulic fluid supplied to and discharged from the arm cylinder 6.
• the rod side spool 17 for the second arm is connected to the rod side port 6b via the rod side passage 39 so as to be parallel to the rod side spool 16 for the first arm.
• the second arm rod side spool 17 receives pilot pressures output from the solenoid valves 17a, 17b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 17a, 17b.
• the second arm rod side spool 17 switches the connection destination of the rod side port 6b to either the second main passage 32 or the tank passage 33, and adjusts the opening of the second arm rod side spool 17.
• the second arm rod side spool 17 controls the flow of hydraulic fluid supplied to and discharged from the rod side port 6b of the arm cylinder 6.
• the spools 14-17 thus configured stroke independently of each other. Therefore, the spools 14-17 can independently control the flow of hydraulic fluid supplied to and discharged from the head side port 6a and rod side port 6b of the arm cylinder 6. That is, the spools 14-17 can independently control the meter-in flow rate and the meter-out flow rate for each of the head side port 6a and rod side port 6b of the arm cylinder 6. In addition, by stroking both arm head side spools 14, 15, a greater flow rate can be supplied to the head side port 6a of the arm cylinder 6 than when only one spool 15 is stroked. The same applies to the arm rod side spools 16, 17.
• the first boom head side spool 18 is connected to the first main passage 31 as described above. More specifically, the first boom head side spool 18 is connected to the first main passage 31 via the first boom passage 40 in which the check valve 40a is interposed. The first boom head side spool 18 is also connected to the tank passage 33. The first boom head side spool 18 controls the flow of hydraulic fluid supplied to and discharged from the boom cylinder 5. More specifically, the boom cylinder 5 has a head side port 5a and a rod side port 5b. The first boom head side spool 18 is connected to the head side port 5a via a head side passage 41.
• the first boom head side spool 18 receives pilot pressures output from the solenoid valves 18a, 18b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 18a, 18b.
• the first boom head side spool 18 switches the connection destination of the head side port 5a to either the first main passage 31 or the tank passage 33 by stroking, and also adjusts the opening degree of the first boom head side spool 18. In this way, the first boom head side spool 18 controls the flow of hydraulic fluid supplied to and discharged from the head side port 5a of the boom cylinder 5.
• the second boom head side spool 19 is connected to the second main passage 32. More specifically, the second boom head side spool 19 is connected to the second main passage 32 via the second boom passage 42 in which the check valve 42a is interposed. The second boom head side spool 19 is also connected to the tank passage 33. The second boom head side spool 19 controls the flow of hydraulic fluid supplied to and discharged from the boom cylinder 5. More specifically, the second boom head side spool 19 is connected to the head side passage 41 so as to be parallel to the first boom head side spool 18. The second boom head side spool 19 is also connected to the head side port 5a via the head side passage 41.
• the second boom head side spool 19 receives the pilot pressures output from the solenoid valves 19a, 19b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 19a, 19b.
• the second boom head side spool 19 switches the connection destination of the head side port 5a to either the second main passage 32 or the tank passage 33 by stroking, and also adjusts the opening degree of the second boom head side spool 19. In this way, the second boom head side spool 19 controls the flow of hydraulic fluid supplied to and discharged from the head side port 5a of the boom cylinder 5.
• the boom rod side spool 20 is connected to the first main passage 31 as described above. More specifically, the boom rod side spool 20 is connected to the first main passage 31 via the first boom passage 40. More specifically, the boom rod side spool 20 is connected to the downstream side of the check valve 40a so as to be parallel to the first boom head side spool 18, and is connected to the first main passage 31 together with the first boom head side spool 18 via the check valve 40a. The boom rod side spool 20 is also connected to the tank passage 33. The boom rod side spool 20 controls the flow of hydraulic fluid supplied to and discharged from the boom cylinder 5. More specifically, the boom rod side spool 20 is connected to the rod side port 5b via the rod side passage 43.
• the boom rod side spool 20 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 boom rod side spool 20 switches the connection destination of the rod side port 5b between the first main passage 31 and the tank passage 33 by stroking, and adjusts the opening degree of the boom rod side spool 20. In this way, the boom rod side spool 20 controls the flow of hydraulic fluid supplied to and discharged from the rod side port 5b of the boom cylinder 5.
• the spools 18-20 thus configured stroke independently of each other. Therefore, the spools 18-20 can independently control the flow of hydraulic fluid supplied to and discharged from the head side port 5a and rod side port 5b of the boom cylinder 5. That is, the spools 18-20 can independently control the meter-in flow rate and the meter-out flow rate for each of the head side port 5a and rod side port 5b of the boom cylinder 5. In addition, by stroking both spools 18, 19 for the boom, the head side spools 18, 19 for the boom can supply a larger flow rate to the head side port 5a of the boom cylinder 5 than when only one spool 18 is stroked.
• the bucket head side spool 21 is connected to the first main passage 31. More specifically, the bucket head side spool 21 is connected to the first main passage 31 via a bucket passage 44 in which a check valve 44a is disposed. The bucket head side spool 21 is also connected to the tank passage 33. The bucket head side spool 21 controls the flow of hydraulic fluid supplied to and discharged from the bucket cylinder 7. More specifically, the bucket cylinder 7 has a head side port 7a and a rod side port 7b. The bucket head side spool 21 is connected to the head side port 7a via a head side passage 45.
• 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, and also adjusts the opening degree of the bucket head side spool 21. In this way, the bucket head side spool 21 controls the flow of hydraulic fluid supplied to and discharged from the head side port 7a of the bucket cylinder 7.
• the bucket rod side spool 22 is connected to the first main passage 31.
• the bucket rod side spool 22 is connected to the downstream side of the check valve 44a in parallel with the bucket head side spool 21 in the bucket passage 44, and is connected to the first main passage 31 together with the bucket head side spool 21 via the check valve 44a.
• the bucket rod side spool 22 is also connected to the tank passage 33.
• the bucket rod side spool 22 controls the flow of hydraulic fluid supplied to and discharged from the bucket cylinder 7.
• the bucket rod side spool 22 is connected to the rod side port 7b via the rod side passage 46.
• the bucket rod side spool 22 receives pilot pressures output from the solenoid valves 22a, 22b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 22a, 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, and also adjusts the opening degree of the bucket rod side spool 22. In this way, 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 control the meter-in flow rate and the meter-out flow rate for each of the head side port 7a and the rod side port 7b of the bucket cylinder 7 independently of each other.
• the first swing spool 23 is connected to the second main passage 32. More specifically, the first swing spool 23 is connected to the second main passage 32 via the swing passage 47 in which the check valve 47a is interposed. The first swing spool 23 is also connected to the tank passage 33. The first swing spool 23 controls the flow of hydraulic fluid supplied to and discharged from the swing motor 4. More specifically, the swing motor 4 has a first supply/discharge port 4a and a second supply/discharge port 4b. The first swing spool 23 is connected to the first supply/discharge port 4a via a first supply/discharge passage 48.
• 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, and adjusts the opening degree of the first swing spool 23. In this way, the first swing spool 23 controls the flow of hydraulic fluid supplied to and discharged from the first supply/discharge port 4a of the swing motor 4.
• the second swing spool 24 receives pilot pressures output from the solenoid valves 24a, 24b in opposing directions, and strokes to a position according to the pilot pressures of the solenoid valves 24a, 24b.
• the second rotation spool 24 switches the connection of the second supply/discharge port 4b between the second main passage 32 and the tank passage 33 by stroking, and adjusts the opening of the second rotation spool 24. In this way, the second rotation spool 24 controls the flow of hydraulic fluid supplied to and discharged from the second supply/discharge port 4b of the rotation motor 4.
• the merging spool 25 is disposed in a merging passage 50 connecting the two main passages 31, 32, and opens and closes the merging passage 50.
• the merging spool 25 receives pilot pressure output from the solenoid valve 25b in a direction against the biasing force of a spring mechanism 25d, which will be described in detail later, and strokes to a position according to the pilot pressure of the solenoid valve 25b.
• the merging spool 25 opens and closes the merging passage 50 by stroking, and adjusts the opening degree of the merging spool 25. In this way, the merging spool 25 merges the hydraulic oil from the second main passage 32 to the first main passage 31 and in the opposite direction, and also controls the flow rate of the hydraulic fluid to be merged.
• the valve block 11 includes a block body 11a, a plurality of first spool holes 11b, a plurality of second spool holes 11c, a plurality of partition wall mounting holes 11d, a partition wall member 11e, and a cover member 11f.
• the block body 11a is formed, for example, in a roughly rectangular parallelepiped shape.
• the block body 11a is formed in a rectangular shape in a plan view seen from one side in the height direction.
• the block body 11a includes a first block member 11g and a second block member 11h.
• the block body 11a can be divided in the height direction into the first block member 11g and the second block member 11h.
• the block body 11a has a plurality of first spool holes 11b and a plurality of second spool holes 11c formed as follows.
• the first spool holes 11b are formed on one side of the block body 11a in the width direction as shown in FIG. 3. More specifically, the first spool holes 11b are arranged in two rows on one side of the block body 11a in the width direction. In this embodiment, for example, six first spool holes 11b are formed on one side of the block body 11a in the width direction. The six first spool holes 11b are arranged in two rows in the depth direction, which is an example of the row direction. In each row, three first spool holes 11b are arranged in the height direction. In each row, the spool holes 11b are aligned so that they are aligned in the height direction. In this embodiment, two first spool holes 11b are formed in the first block member 11g and four in the second block member 11h. Furthermore, the six first spool holes 11b extend in the width direction from one side of the block body 11a in the width direction.
• the second spool holes 11c are formed on the other widthwise side of the block body 11a as shown in FIG. 4. More specifically, the second spool holes 11c are arranged in two rows in the depth direction on the other widthwise side of the block body 11a. In this embodiment, eight second spool holes 11c are formed on the other widthwise side of the block body 11a. The eight second spool holes 11c are arranged in two rows in the depth direction, four each in the height direction. In each row, the second spool holes 11c are aligned so that they are lined up in the height direction. In this embodiment, four second spool holes 11c are formed in each of the block members 11g and 11h so arranged.
• the eight second spool holes 11c extend in the width direction from the other widthwise side of the block body 11a.
• the eight second spool holes 11c six second spool holes 11c are arranged to correspond to the first spool holes 11b, and extend toward the corresponding first spool holes 11b. Therefore, two corresponding spool holes 11b, 11c are arranged in the width direction.
• each of the second spool holes 11c is arranged in the same row as the corresponding first spool hole 11b in the width direction. That is, the two corresponding spool holes 11b, 11c are arranged in a row in the width direction.
• the bulkhead mounting holes 11d are holes extending in the height direction, which is an example of the second direction, as shown in Figures 3 and 4. Each of the bulkhead mounting holes 11d penetrates, for example, the block body 11a in the height direction from the top surface to the bottom surface. In this embodiment, two bulkhead mounting holes 11d are formed in each of the block members 11g and 11h. The bulkhead mounting holes 11d penetrate between the first spool hole 11b and the second spool hole 11c. In more detail, one bulkhead mounting hole 11d is formed on each side in the height direction for each row of spool holes 11b, and penetrates between the first spool hole 11b and the second spool hole 11c in each row. As a result, the two spool holes 11b and 11c are connected to each other by the bulkhead mounting holes 11d.
• the partition members 11e are inserted into the partition mounting holes 11d. As a result, each of the partition members 11e forms a partition 11j between the first spool hole 11b and the second spool hole 11c (see Figures 6 to 9, which will be described in detail later).
• the partition 11j is a wall for isolating the corresponding first spool hole 11b and second spool hole 11c.
• the partition member 11e shown in Figure 10 is a rod-shaped member, for example, a round bar member with a circular cross section. The outer dimensions of the partition member 11e are formed to be approximately the same as the hole shape of the partition mounting hole 11d.
• the partition member 11e may be a rod-shaped member with a rectangular cross section with rounded corners, or a rod-shaped member with another cross-sectional shape.
• the partition member 11e is fitted into the partition mounting hole 11d so that the hydraulic fluid does not leak out of the partition mounting hole 11d.
• the valve block 11 has four partition members 11e. Each partition member 11e is inserted into each partition mounting hole 11d from the opening on one side and the other side in the height direction. Each partition member 11e forms a partition 11j between the first spool hole 11b and the second spool hole 11c.
• the partition member 11e also has a notch 27 and a positioning portion 28.
• the cutout portion 27 has a first surface 27a and a second surface 27b that are formed parallel to each other (see also Figures 6 to 9).
• the cutout portion 27 is formed so as to cut out the outer peripheral surface of the partition member 11e. That is, the distance between the first surface 27a and the second surface 27b is shorter than the diameter of the partition member 11e.
• the cutout portion 27 is interposed between the first spool hole 11b and the second spool hole 11c in the corresponding portions. More specifically, the cutout portion 27 is interposed between the first spool hole 11b and the second spool hole 11c such that the first surface 27a faces the first spool hole 11b and the second surface 27b faces the second spool hole 11c.
• the cutout portion 27 forms a partition wall 11j between the first spool hole 11b and the second spool hole 11c.
• the positioning portion 28 determines the axial position of the partition member 11e in the partition mounting hole 11d. More specifically, the positioning portion 28 determines the axial position of the partition member 11e so that the first surface 27a faces the first spool hole 11b and the second surface 27b faces the second spool hole 11c. In this embodiment, the positioning portion 28 is located at one axial end of the partition member 11e and is formed in the same manner as the cutout portion 27. That is, the positioning portion 28 has two surfaces formed parallel to each other.
• the lid members 11f are provided on the upper and lower surfaces of the block body 11a, respectively, and close the openings of each bulkhead mounting hole 11d formed on the upper and lower surfaces of the block body 11a.
• the lid members 11f also have fitting portions 11i formed at positions corresponding to each bulkhead mounting hole 11d.
• the fitting portions 11i are formed to correspond to the positioning portions 28, and fit into the positioning portions 28. This allows the lid members 11f to prevent the bulkhead member 11e from rotating in the bulkhead mounting holes 11d.
• each of the spools 12 to 25 are inserted into the valve block 11 as follows. That is, each of the spools 12 to 25 is slidably inserted into the first spool hole 11b and the second spool hole 11c of the valve block 11 as shown in Figures 6 to 9.
• each of the spools 16, 17, 20, 22, 24, and 25, which are an example of a first spool is slidably inserted into the first spool hole 11b.
• Each of the spools 16, 17, 20, 22, and 24 forms an inner pilot chamber 16e, 17e, 20e, 22e, and 24e, which is an example of a first pilot chamber, between the partition member 11e (more specifically, the partition 11j) in the first spool hole 11b.
• the remaining spools 12 to 15, 18, 19, 21, and 23, which are an example of a second spool, are slidably inserted into the second spool hole 11c.
• Each of the spools 12-15, 18, 19, 21, and 23 forms an inner pilot chamber 12e-15e, 18e, 19e, 21e, or 23e between the partition member 11e and the second spool hole 11c.
• Each of the spools 14, 15, 18, 19, 21, and 23 forms an inner pilot chamber 14e, 15e, 18e, 19e, 21e, or 23e, which is an example of a second pilot chamber, between the partition member 11j and the second spool hole 11c.
• the second boom passage 42 is disposed adjacent to the second boom head side spool 19.
• the second boom passage 42 is connected to the second main passage 32 and the second boom head side spool 19 with a check valve 35a interposed therebetween.
• the second boom head side spool 19 is also connected to the rod side passage 43 and the tank passage 33 axially outward from the second boom passage 42.
• the merging passage 50 is disposed adjacent to the other side of the merging spool 25 in the depth direction.
• the merging passage 50 connects the first main passage 31 and the second main passage 32 with the merging spool 25 interposed in between.
• the first arm passage 36 and the second arm passage 38 are arranged at a distance from each other in the depth direction.
• the first arm passage 36 is arranged adjacent to the first arm head side spool 14 and the first arm rod side spool 16.
• the first arm passage 36 is connected to the first main passage 31, and branches off from the first main passage 31 midway to connect to the first arm head side spool 14 and the first arm rod side spool 16.
• a check valve 36a is interposed in the first arm passage 36 at the branching point.
• the head side passage 37 and the tank passage 33 are connected in this order to the first arm head side spool 14 axially outward from the first arm passage 36.
• the rod side passage 39 and the tank passage 33 are connected to the first arm rod side spool 16 axially outward from the first arm passage 36.
• the head side passage 37 extends in the depth direction so as to straddle the two arm head side spools 14, 15.
• the head side passage 37 is connected to the head side port 5a of the arm cylinder 6 via head side connection ports 37a, 37b that open on both sides in the depth direction.
• the rod side passage 43 extends in the other depth direction so as to straddle the second arm rod side spool 17.
• the rod side passage 39 is connected to the rod side port 5b of the arm cylinder 6 via a rod side connection port 39a that opens on the other side in the depth direction.
• the second arm passage 38 is disposed adjacent to the second arm head side spool 15 and the second arm rod side spool 17.
• the second arm passage 38 is connected to the second main passage 32, and branches off from the second main passage 32 midway to connect to the second arm head side spool 15 and the second arm rod side spool 17.
• a check valve 38a is disposed in the second arm passage 38 at the branching point.
• the head side passage 37 and the tank passage 33 are connected in this order to the second arm head side spool 15 axially outward from the second arm passage 38.
• the rod side passage 39 and the tank passage 33 are connected in this order to the second arm rod side spool 17 axially outward from the second arm passage 38.
• the bucket passage 44 and the swivel passage 47 are arranged apart on one side and the other side in the depth direction.
• the bucket passage 44 is arranged adjacent to the bucket head side spool 21 and the bucket rod side spool 22.
• the bucket passage 44 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 44a is interposed in the bucket passage 44 at the branching point.
• the head side passage 45 and the tank passage 33 are connected in turn to the bucket head side spool 21 axially outward from the bucket passage 44.
• the rod side passage 46 and the tank passage 33 are connected in turn to the bucket rod side spool 22 axially outward from the bucket passage 44.
• the head side passage 45 is connected to the head side port 7a of the bucket cylinder 7 via a head side connection port 45a that opens on one side surface in the depth direction.
• the rod-side passage 46 is connected to the rod-side port 7b of the bucket cylinder 7 via a rod-side connection port 46a that opens on one side in the depth direction.
• the swivel passage 47 is disposed adjacent to the first swivel spool 23 and the second swivel spool 24.
• the swivel passage 47 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 47a is disposed in the swivel passage 47 at the branching point.
• the first supply and exhaust passage 48 and the tank passage 33 are connected to the first swivel spool 23 in the axial direction outward from the swivel passage 47.
• the second supply and exhaust passage 49 and the tank passage 33 are connected to the second swivel spool 24 in the axial direction outward from the swivel passage 47.
• the first supply and exhaust passage 48 is connected to the first supply and exhaust port 4a of the swivel motor 4 via a supply and exhaust connection port 48a that opens on the other side in the depth direction.
• the second supply and exhaust passage 49 is connected to the second supply and exhaust port 4b of the swivel motor 4 via a supply and exhaust connection port 49a that opens on the other side in the depth direction.
• the partition member 11e is inserted into the partition mounting hole 11d to form a partition between the first spool hole 11b and the second spool hole 11c. Therefore, it is easy to form the partition 11j.
• the first arm passage 36 and the second arm passage 38 are arranged at a distance from each other on one side and the other side in the width direction.
• the first arm passage 36 is arranged in the first block member 11Ag
• the second arm passage 38 is arranged in the second block member 11Ah.
• the first arm passage 36 is arranged between the first arm head side spool 14 and the first arm rod side spool 16.
• the first arm passage 36 is connected to the first main passage 31, and branches off from the first main passage 31 midway to connect to the first arm head side spool 14 and the first arm rod side spool 16.
• a check valve 36a is interposed in the first arm passage 36 at the branching point.
• the head side passage 37 and the tank passage 33 are connected in this order to the first arm head side spool 14 axially inward from the first arm passage 36.
• the rod side passage 39 and the tank passage 33 are connected to the first arm rod side spool 16 axially inside the first arm passage 36.
• the head side passage 37 is formed in a U-shape so as to straddle the two arm head side spools 14, 15 and penetrate the partition member 11Ae.
• the head side passage 37 is connected to the head side port 5a of the arm cylinder 6 via head side connection ports 37a, 37b that open on one side surface in the depth direction of each block member 11Ag, 11Ah.
• the rod side passage 39 is formed in a U-shape so as to penetrate the partition member 11Ae and straddle the second arm rod side spool 17.
• the rod side passage 39 is connected to the rod side port 5b of the arm cylinder 6 via a rod side connection port 39a that opens on the other side surface in the depth direction.
• the second arm passage 38 is disposed between the second arm head side spool 15 and the second arm rod side spool 17.
• the second arm passage 38 is connected to the second main passage 32, and branches off from the second main passage 32 midway to connect to the second arm head side spool 15 and the second arm rod side spool 17.
• a check valve 38a is disposed in the second arm passage 38 at the branching point.
• the second arm head side spool 15 is connected to the head side passage 37 and the tank passage 33 in this order, axially inward from the second arm passage 38.
• the second arm rod side spool 17 is connected to the rod side passage 39 and the tank passage 33 in this order, axially inward from the second arm passage 38.
• the first spool hole 11Bb is shorter in the axial direction (i.e., width direction) than the first spool hole 11b and the second spool hole 11Bc, and the second spool hole 11Bc is longer in the axial direction (i.e., width direction) than the second spool hole 11c and the first spool hole 11Bb.
• the bulkhead mounting holes 11Bd are spaced apart from each other in the depth direction, which is the third direction, and penetrate the first block member 11Bg in the vertical direction so as to connect the two spool holes 11b and 11c to each other.
• the drain chamber 11s is connected to a drain port (not shown) and guides the working fluid guided to the drain chamber 11s (or, more specifically, each drain space 29e, 30e, 25e) to the drain port.
• the drain chamber 11s is also connected to the connecting passages 11r of each partition member 11n.
• the partition members 11n connect the connecting passage 11r to the first and second drain spaces 29e that they each form, and the internal passage 11q is connected to the first and second drain spaces 29e via the connecting passage 11r.
• the partition mounting holes 11d, 11Bd are in communication with each other, and the internal passages 11p, 11q of the partition members 11n, m inserted therein are also in communication with each other.
• the opening degree of at least one of the unloading spools 29 and 30 is narrowed or closed. This makes it possible to supply hydraulic fluid to the actuators 2 to 7 to be operated.
• the internal passage 11q is connected to the gap between the partition member 11n and the partition mounting hole 11Bd and is also connected to the drain port. Therefore, the hydraulic fluid that has flowed into the gap can be discharged to the drain port via the internal passage 11q. This makes it possible to prevent pressure from building up in the gap between the partition member 11n and the partition mounting hole 11Bd.
• the internal passage 11q is connected to the drain port via the connection passage 11r and the drain chamber 11s. Therefore, the internal passage 11q and the drain chamber 11s can share a passage that connects to the drain port, so the number of passages can be reduced. This allows the valve block 11B to be formed compactly.
• the bulkhead mounting holes 11d, 11Bd are positioned offset from each other in the width direction. Therefore, the first spool hole 11Bb and the second spool hole 11Bc, which have the bulkhead mounting hole 11Bd between them, and the first spool hole 11b and the second spool hole 11c, which have the bulkhead mounting hole 11d between them, can be made to have different lengths, and spools 12-25, 29, 30 of different lengths can be inserted into them.
• the bulkhead mounting hole 11d is formed to extend in the height direction in the central portion of the valve block 11B in the first direction. Therefore, the first spool hole 11b and the second spool hole 11c, which interpose the bulkhead mounting hole 11d between them, are formed to be the same length, and spools 14-17, 21-24 of equal lengths can be inserted. Furthermore, the bulkhead mounting hole 11Bd is formed on the first spool hole 11Bb side of the central portion in the first direction in the valve block 11B. Therefore, the first spool hole 11Bb and the second spool hole 11Bc can be formed to be different lengths from each other, and spools 12, 13, 18-20, 25, 29, 30 of different lengths can be inserted therein.
• the unloading spools 29, 30 and the traveling spools 12, 13 are inserted into the first spool hole 11Bb and the second spool hole 11Bc.
• the unloading spools 29, 30 can be formed shorter than the traveling spools 12, 13, so the length of the first spool hole 11Bb can be shortened while ensuring the length of the second spool hole 11Bc. This allows the valve block 11B to be formed compactly even when the unloading spools 29, 30 and the traveling spools 12, 13 are arranged in a row.
• the eight second spool holes 11c, 11Bc are arranged in two rows, and in each row, they are arranged side by side in the second direction. Also, multiple second cover bodies 65-68 are arranged in the valve block so as to cover two adjacent second spool holes 11c, 11Bc. Therefore, the multi-control valve 1B can be made compact.
• the multi-control valve 1B of the third embodiment has the same effects as the multi-control valve 1 of the first embodiment.
• the partition members 11e, 11Ae, 11n, and 11m form the partition 11j, but this is not necessarily required.
• two corresponding spool holes 11Cb and 11Cc may be formed as blind holes, and the part between them may form the partition 11Cj. This allows the number of parts required to form the partition 11Cj to be reduced. Note that when the spool holes 11Cb and 11Cc are formed as blind holes as in the multi-control valve 1C, the yield rate decreases if the shape of the spool hole is to be accurately formed.
• the solenoid valves in the sixth aspect are provided in the partition members, respectively.
• the first pilot chamber and the second pilot chamber are formed in the partition member. Therefore, the length of each spool hole can be shortened by the length of each pilot chamber formed in the partition member. This allows the length of the valve block in the first direction to be shortened.
• the first spool hole and the second spool hole are blind holes extending in the first direction, and the partition is formed between the first spool hole and the second spool hole.
• the corresponding first spool holes and second spool holes are separated by a partition. Therefore, the first spool and second spool can be stroked independently of each other. Therefore, unlike the conventional technology, it is not necessary to insert spools related to the same actuator between the corresponding first spool holes and second spool holes. In this way, first spools related to the same actuator can be inserted into each of two first spool holes adjacent in the row direction. This improves the degree of freedom in arranging the spools in the multi-control valve.
• At least one of the plurality of first spools forms a drain chamber connected to a drain port between the partition wall, the partition wall member has a connecting passage connecting the internal passage and the drain chamber, and the internal passage is connected to the drain port via the connecting passage and the drain chamber.
• the unloading spool receives pilot pressure at one end and forms a drain chamber between the partition and the other end. Therefore, the space on the other end side of the unloading spool can be used as a drain chamber, allowing the valve block to be formed compactly.
• the valve block includes two main passages each having a pump port
• the first spool includes the two unloading spools and a merging spool that merges the hydraulic fluid flowing through the two main passages
• the two unloading spools receive pilot pressure at one end and form first and second drain spaces between the partition at the other end
• the merging spool receives pilot pressure at one end and forms a third drain space between the partition at the other end
• the drain chamber is formed by connecting the first to third drain spaces.
• the drain chamber is formed by connecting the first to third drain spaces. Therefore, the drain passages connecting each drain space to the drain port can be shared, which reduces the number of passages that need to be formed in the valve block. This allows the valve block to be formed compactly.
• the partition wall mounting hole has a first partition wall mounting hole and the first and second partition wall mounting holes are arranged offset from each other in the first direction.
• the first and second bulkhead mounting holes are positioned offset from each other in the first direction. Therefore, the first and second spool holes with the first bulkhead mounting hole therebetween and the first and second spool holes with the second bulkhead mounting hole therebetween can have different lengths, and spools of different lengths can be inserted into them.
• the eight second spool holes are arranged in two rows, and in each row, they are arranged side by side in the second direction. Also, a plurality of cover bodies are arranged in the valve block so as to cover two or more second spool holes. Therefore, the multi-control valve can be made compact.

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• 2025
  • 2025-01-09 JP JP2025569423A patent/JPWO2025150543A1/ja active Pending
  • 2025-01-09 WO PCT/JP2025/000563 patent/WO2025150543A1/ja active Pending

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