Work machine
First Claim
1. A work machine having a traveling apparatus and a work implement driven by an engine,wherein a hydraulic system mounted on the work machine comprises:
- an HST pump comprising a swash plate, variable displacement pump driven by the engine,an HST motor connected in a closed circuit to the HST pump and a pair of speed-changing oil passageways, the HST motor being driven by an amount of oil supplied by the HST pump, thereby to drive the traveling apparatus,a main pump driven by the engine, the main pump supplying pressure oil to the work implement,a pilot pump driven by the engine,a swash plate positioning circuit configured to effect positioning of a swash plate of the HST pump with pilot oil supplied from the pilot pump, anda bleed circuit configured to drain, via a throttle, a portion of the pilot oil supplied to the swash plate positioning circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a work machine having a traveling apparatus and a work implement driven by an engine. A hydraulic system mounted on the work machine includes an HST pump comprising a swash plate, variable displacement pump driven by the engine, an HST motor connected in a closed circuit to the HST pump and a pair of speed-changing oil passageways, the HST motor being driven by an amount of oil supplied by the HST pump, thereby to drive the traveling apparatus, a main pump driven by the engine, the main pump supplying pressure oil to the work implement, a pilot pump driven by the engine, a swash plate positioning circuit configured to effect positioning of a swash plate of the HST pump with pilot oil supplied from the pilot pump, and a bleed circuit configured to drain, via a throttle, a portion of the pilot oil supplied to the swash plate positioning circuit.
24 Citations
13 Claims
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1. A work machine having a traveling apparatus and a work implement driven by an engine,
wherein a hydraulic system mounted on the work machine comprises: -
an HST pump comprising a swash plate, variable displacement pump driven by the engine, an HST motor connected in a closed circuit to the HST pump and a pair of speed-changing oil passageways, the HST motor being driven by an amount of oil supplied by the HST pump, thereby to drive the traveling apparatus, a main pump driven by the engine, the main pump supplying pressure oil to the work implement, a pilot pump driven by the engine, a swash plate positioning circuit configured to effect positioning of a swash plate of the HST pump with pilot oil supplied from the pilot pump, and a bleed circuit configured to drain, via a throttle, a portion of the pilot oil supplied to the swash plate positioning circuit. - View Dependent Claims (2, 3, 4, 10, 11, 12, 13)
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5. The work machine according to clam 1, wherein:
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the work implement comprises a bucket capable of effecting a scooping/dumping action; and the hydraulic system includes a bucket cylinder for causing the bucket to effect a scooping/dumping action and a bucket control valve for controlling the bucket cylinder; and wherein in a hydraulic circuit at a scooping position where the bucket is caused to effect a scooping action by the bucket control valve, there is provided a bucket bleed circuit for draining, through a throttle, a portion of the pressure oil supplied from the main pump to the bucket cylinder. - View Dependent Claims (6, 7, 8, 9)
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Specification