Hybrid machine with hydraulic drive device
First Claim
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.
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Accused Products
Abstract
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.
95 Citations
29 Claims
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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:
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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. - View Dependent Claims (2)
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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:
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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. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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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:
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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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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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:
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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. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification