초록 ▼

A hybrid machine with a hydraulic drive device having hydraulic actuators allowed to operate against and by external loads is provided. To this end, the hybrid machine comprises hydraulic cylinders (7), first hydraulic pumps (P1) connected, with closed circuits, to head side pressure receiving chamb

A hybrid machine with a hydraulic drive device having hydraulic actuators allowed to operate against and by external loads is provided. To this end, the hybrid machine comprises hydraulic cylinders (7), first hydraulic pumps (P1) connected, with closed circuits, to head side pressure receiving chambers (7S) and bottom side pressure receiving chambers (7L) of the hydraulic cylinders (7), and second hydraulic pumps (P2) connected, with open circuits, to the bottom side pressure receiving chambers (7L) and an external oil chamber (10), wherein the first and second hydraulic pumps (P1, P2) are connected to electric motors (M) so as to be driven.

대표청구항 ▼

1. A hybrid machine with a hydraulic drive device, comprising a power source, a generator driven by power of said power source, electric motors, and a secondary battery for storing electromotive force of said electric motors generated by reverse driving of said electric motors by external loads, sai

1. A hybrid machine with a hydraulic drive device, comprising a power source, a generator driven by power of said power source, electric motors, and a secondary battery for storing electromotive force of said electric motors generated by reverse driving of said electric motors by external loads, said electric motors receiving electric power from said generator and said secondary battery so as to be driven, said hybrid machine comprising:hydraulic cylinders allowed to be extended and contracted against and by external loads; first hydraulic pumps connected, with closed circuits, to head side pressure receiving chambers and bottom side pressure receiving chambers of said hydraulic cylinders; and second hydraulic pumps connected, with open circuits, to said bottom side pressure receiving chambers and an external oil chamber, wherein said first and second hydraulic pumps are connected to said electric motors so as to be driven. 2. The hybrid machine with the hydraulic drive device according to claim 1,wherein said first and second hydraulic pumps have a relation of approximately “A1:A2=Q1:(Q1+Q2)”, where A1 is a piston pressure receiving area of said head side pressure receiving chamber, A2 is a piston pressure receiving area of said bottom side pressure receiving chamber, Q1 is a discharge amount per unit time of said first hydraulic pump, and Q2 is a discharge amount per unit time of said second hydraulic pump. 3. A hybrid machine with a hydraulic drive device, comprising a power source, a generator driven by power of said power source, electric motors, and a secondary battery for storing electromotive force of said electric motors generated by reverse driving of said electric motors by external loads, said electric motors receiving electric power from said generator and said secondary battery so as to be driven, said hybrid machine comprising:hydraulic cylinders allowed to be extended and contracted against and by external loads; first hydraulic pumps connected, with closed circuits, to head side pressure receiving chambers and bottom side pressure receiving chambers of said hydraulic cylinders; and second hydraulic pumps connected, with open circuits, to said bottom side pressure receiving chambers and an external accumulator, wherein said first and second hydraulic pumps are connected to said electric motors so as to be driven. 4. The hybrid machine with the hydraulic drive device according to claim 3,wherein said first and second hydraulic pumps are inclined shaft type piston pumps, and said electric motor is of a double end output shaft type, and wherein said first hydraulic pump is connected to one of a double end output shaft, and said second hydraulic pump is connected to the other thereof. 5. The hybrid machine with the hydraulic drive device according to claim 3,wherein said accumulator is of a maximum operating pressure variable type. 6. The hybrid machine with the hydraulic drive device according to claim 3,wherein with respect to a first passage which connects said first hydraulic pump and said head side pressure receiving chamber, a drive torque of said electric motor equal to a product value of a first relief pressure determined in advance for said first passage, and a sum of respective displacements per one rotation of said first and second hydraulic pumps is a maximum drive torque of said electric motor, and with respect to a second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber, a drive torque of said electric motor equal to a product value of a second relief pressure determined in advance for said second passage, and the sum of respective displacements per one rotation of said first and second hydraulic pumps is a maximum drive torque of said electric motor. 7. The hybrid machine with the hydraulic drive device according to claim 3,wherein when at least one of said first and second hydraulic pumps is a piston pump, oil sumps which catch external leakage of oil from said piston pump, a third hydraulic pump which sucks the oil in said oil sumps, and a first switching valve which selectably leads discharged oil from said third hydraulic pump to either one of said accumulator or said oil sumps are provided. 8. The hybrid machine with the hydraulic drive device according any one of claims 3 to 7,wherein when a predetermined portion of said first passage which connects said first hydraulic pump and said head side pressure receiving chamber is defined as a first connection point, and a predetermined portion of said second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber is defined as a second connection point, a passage which connects said accumulator and said first connection point is provided, and a first check valve which permits only oil flow to said first connection point is provided in this passage, and a passage which connects said accumulator and said second connection point is provided, and a second check valve which permits only oil flow to said second connection point is provided in this passage. 9. The hybrid machine with the hydraulic drive device according to any one of claims 3 to 7,wherein a first on-off valve is provided in said first passage which connects said first hydraulic pump and said head side pressure receiving chamber, and wherein a second on-off valve is provided in said second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber. 10. The hybrid machine with the hydraulic drive device according any one of claims 3 to 7,wherein when a predetermined portion of said first passage which connects said first hydraulic pump and said bead side pressure receiving chamber is defined as a first connection point, and a predetermined portion of said second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber is defined as a second connection point, a passage which connects said accumulator and said first connection point is provided, and a first check valve which permits only oil flow to said first connection point is provided in this passage, and a passage which connects said accumulator and said second connection point is provided, and a second check valve which permits only oil flow to said second connection point is provided in this passage, further a first on-off valve is provided between said first hydraulic pump and said first connection point in said first passage, and a second on-off valve is provided between said first and second hydraulic pumps and said second connection point in said second passage, and a third switching valve which comprises: a first port opening into a passage leading to said accumulator; a second port opening into a passage leading to a point between said first hydraulic pump and said first on-off valve of said first passage; and a third port opening into a passage leading to a point between said first and second hydraulic pumps and said second on-off valve of said second passage, receives oil pressure Pa of said first passage as pilot pressure at a pressure receiving portion on one end side, on the other hand receives pressure Pb of said second passage as pilot pressure at a pressure receiving portion on the other end side, and which comprises: a first position which allows only said first and second ports to communicate with each other in the inside when “Pa<Pb”; a second position which allows only said first and third ports to communicate with each other in the inside when “Pb<Pa”; and a third position which allows all of said first to third ports to be interrupted from one another in the inside when “Pa=Pb”, is provided. 11. The hybrid machine with the hydraulic drive device according to claim 10,wherein a controller for rotating said electric motor for only a predetermined time in a direction reverse to a designated rotation direction when the rotation of said electric motor is started, and after the predetermined time, rotating said electric motor in the designated rotation direction is provided. 12. A hybrid machine with a hydraulic drive device, comprising a power source, a generator driven by power of said power source, electric motors, and a secondary battery for storing electromotive force of said electric motors generated by reverse driving of said electric motors by external loads, said electric motors receiving electric power from said generator and said secondary battery so as to be driven, said hybrid machine comprising:hydraulic cylinders allowed to be extended and contracted against and by external loads; first hydraulic pumps connected, with closed circuits, to head side pressure receiving chambers and bottom side pressure receiving chambers of said hydraulic cylinders; and second hydraulic pumps connected, with open circuits, to said bottom side pressure receiving chambers and an external accumulator, wherein said first and second hydraulic pumps are connected to said electric motors so as to be driven; and wherein an on-off valve which allows said second hydraulic pump and said accumulator to be interrupted from each other is provided in a passage from said second hydraulic pump to said accumulator. 13. The hybrid machine with the hydraulic drive device according to claim 12,wherein said first and second hydraulic pumps are inclined shaft type piston pumps, and said electric motor is of a double end output shaft type, and wherein said first hydraulic pump is connected to one of a double end output shaft, and said second hydraulic pump is connected to the other thereof. 14. The hybrid machine with the hydraulic drive device according to claim 12,wherein said accumulator is of a maximum operating pressure variable type. 15. The hybrid machine with the hydraulic drive device according to claim 12,wherein with respect to a first passage which connects said first hydraulic pump and said head side pressure receiving chamber, a drive torque of said electric motor equal to a product value of a first relief pressure determined in advance for said first passage, and a sum of respective displacements per one rotation of said first and second hydraulic pumps is a maximum drive torque of said electric motor, and with respect to a second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber, a drive torque of said electric motor equal to a product value of a second relief pressure determined in advance for said second passage, and the sum of respective displacements per one rotation of said first and second hydraulic pumps is a maximum drive torque of said electric motor. 16. The hybrid machine with the hydraulic drive device according to claim 12,wherein when at least one of said first and second hydraulic pumps is a piston pump, oil sumps which catch external leakage of oil from said piston pump, a third hydraulic pump which sucks the oil in said oil sumps, and a first switching valve which selectably leads discharged oil from said third hydraulic pump to either one of said accumulator or said oil sumps are provided. 17. The hybrid machine with the hydraulic drive device according to claim 16,wherein a variable relief valve is provided in said first and second passages, and wherein a second switching valve for selectively draining drain oil to either one of said accumulator or said oil sumps is provided on the drain side of said variable relief valve. 18. The hybrid machine with the hydraulic drive device according to claim 12,wherein when a predetermined portion of said first passage which connects said first hydraulic pump and said head side pressure receiving chamber is defined as a first connection point, and a predetermined portion of said second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber is defined as a second connection point, a passage which connects said accumulator and said first connection point is provided, and a first check valve which permits only oil flow to said first connection point is provided in this passage, and a passage which connects said accumulator and said second connection point is provided, and a second check valve which permits only oil flow to said second connection point is provided in this passage. 19. The hybrid machine with the hydraulic drive device according to claim 12,wherein a first on-off valve is provided in said first passage which connects said first hydraulic pump and said head side pressure receiving chamber, and wherein a second on-off valve is provided in said second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber. 20. The hybrid machine with the hydraulic drive device according to claim 12,wherein when a predetermined portion of said first passage which connects said first hydraulic pump and said head side pressure receiving chamber is defined as a first connection point, and a predetermined portion of said second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber is defined as a second connection point, a passage which connects said accumulator and said first connection point is provided, and a first check valve which permits only oil flow to said first connection point is provided in this passage, and a passage which connects said accumulator and said second connection point is provided, and a second check valve which permits only oil flow to said second connection point is provided in this passage, further a first on-off valve is provided between said first hydraulic pump and said first connection point in said first passage, and a second on-off valve is provided between said first and second hydraulic pumps and said second connection point in said second passage, and a third switching valve which comprises: a first port opening into a passage leading to said accumulator, a second port opening into a passage leading to a point between said first hydraulic pump and said first on-off valve of said first passage; and a third port opening into a passage leading to a point between said first and second hydraulic pumps and said second on-off valve of said second passage, receives oil pressure Pa of said first passage as pilot pressure at a pressure receiving portion on one end side, on the other hand receives pressure Pb of said second passage as pilot pressure at a pressure receiving portion on the other end side, and which comprises:a first position which allows only said first and second ports to communicate with each other in the inside when “Pa<Pb”; a second position which allows only said first and third ports to communicate with each other in the inside when “Pb<Pa”; and a third position which allows all of said first to third ports to be interrupted from one another in the inside when “Pa=Pb”, is provided. 21. The hybrid machine with the hydraulic drive device according to claim 20,wherein a controller for rotating said electric motor for only a predetermined time in a direction reverse to a designated rotation direction when the rotation of said electric motor is started, and after the predetermined time, rotating said electric motor in the designated rotation direction is provided. 22. A hybrid machine with a hydraulic drive device, comprising a power source, a generator driven by power of said power source, electric motors, and a secondary battery for storing electromotive force of said electric motors generated by reverse driving of said electric motors by external loads, said electric motors receiving electric power from said generator and said secondary battery so as to be driven, said hybrid machine comprising:hydraulic cylinders allowed to be extended and contracted against and by external loads; first hydraulic pumps connected, with closed circuits, to head side pressure receiving chambers and bottom side pressure receiving chambers of said hydraulic cylinders; and second hydraulic pumps connected, with open circuits, to said bottom side pressure receiving chambers and an external accumulator, wherein said first and second hydraulic pumps are connected to said electric motors so as to be driven, wherein when at least one of said first and second hydraulic pumps is a piston pump, oil sumps which catch external leakage of oil from said piston pump, a third hydraulic pump which sucks the oil in said oil sumps, and a first switching valve which selectably leads discharged oil from said third hydraulic pump to either one of said accumulator or said oil sumps are provided, wherein a variable relief valve is provided in said first and second passages, and wherein a second switching valve for selectively draining drain oil to either one of said accumulator or said oil sumps is provided on the drain side of said variable relief valve. 23. The hybrid machine with the hydraulic drive device according to claim 22,wherein said first and second hydraulic pumps are inclined shaft type piston pumps, and said electric motor is of a double end output shaft type, and wherein said first hydraulic pump is connected to one of a double end output shaft, and said second hydraulic pump is connected to the other thereof. 24. The hybrid machine with the hydraulic drive device according to claim 22,wherein said accumulator is of a maximum operating pressure variable type. 25. The hybrid machine with the hydraulic drive device according to claim 22,wherein with respect to a first passage which connects said first hydraulic pump and said head side pressure receiving chamber, a drive torque of said electric motor equal to a product value of a first relief pressure determined in advance for said first passage, and a sum of respective displacements per one rotation of said first and second hydraulic pumps is a maximum drive torque of said electric motor, and with respect to a second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber, a drive torque of said electric motor equal to a product value of a second relief pressure determined in advance for said second passage, and the sum of respective displacements per one rotation of said first and second hydraulic pumps is a maximum drive torque of said electric motor.26. The hybrid machine with the hydraulic drive device according to claim 22,wherein when a predetermined portion of said first passage which connects said first hydraulic pump and said head side pressure receiving chamber is defined as a first connection point, and a predetermined portion of said second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber is defined as a second connection point, a passage which connects said accumulator and said first connection point is provided, and a first check valve which permits only oil flow to said first connection point is provided in this passage, and a passage which connects said accumulator and said second connection point is provided, and a second check valve which permits only oil flow to said second connection point is provided in this passage. 27. The hybrid machine with the hydraulic drive device according to claim 22,wherein a first on-off valve is provided in said first passage which connects said first hydraulic pump and said head side pressure receiving chamber, and wherein a second on-off valve is provided in said second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber. 28. The hybrid machine with the hydraulic drive device according to claim 22,wherein when a predetermined portion of said first passage which connects said first hydraulic pump and said head side pressure receiving chamber is defined as a first connection point, and a predetermined portion of said second passage which connects said first and second hydraulic pumps and said bottom side pressure receiving chamber is defined as a second connection point, a passage which connects said accumulator and said first connection point is provided, and a first check valve which permits only oil flow to said first connection point is provided in this passage, and a passage which connects said accumulator and said second connection point is provided, and a second check valve which permits only oil flow to said second connection point is provided in this passage, further a first on-off valve is provided between said first hydraulic pump and said first connection point in said first passage, and a second on-off valve is provided between said first and second hydraulic pumps and said second connection point in said second passage, and a third switching valve which comprises: a first port opening into a passage leading to said accumulator;a second port opening into a passage leading to a point between said first hydraulic pump and said first on-off valve of said first passage; and a third port opening into a passage leading to a point between said first and second hydraulic pumps and said second on-off valve of said second passage, receives oil pressure Pa of said first passage as pilot pressure at a pressure receiving portion on one end side, on the other hand receives pressure Pb of said second passage as pilot pressure at a pressure receiving portion on the other end side, and which comprises:a first position which allows only said first and second ports to communicate with each other in the inside when “Pa<Pb”;a second position which allows only said first and third ports to communicate with each other in the inside when “Pb<Pa”; and a third position which allows all of said first to third ports to be interrupted from one another in the inside when “Pa=Pb”, is provided. 29. The hybrid machine with the hydraulic drive device according to claim 28,wherein a controller for rotating said electric motor for only a predetermined time in a direction reverse to a designated rotation direction when the rotation of said electric motor is started, and after the predetermined time, rotating said electric motor in the designated rotation direction is provided.