Construction machine
AssigneeHitachi Construction Machinery Co., Ltd.
InventorsYoshitaka Yanase, Hajime Okano, Yuuji Murayama
Life of this patent
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Abstract
A closed-circuit pipe group (30) that constitutes a closed circuit system (25 to 28) is distributed through upper positions of a closed-circuit hydraulic pump (29) and an open-circuit hydraulic pump (35) along an upper surface plate (22) of a housing (20). Further, an open-circuit pipe group (36) that constitutes an open circuit system (31 to 34) is distributed through lower positions of the closed-circuit hydraulic pump (29) and the open-circuit hydraulic pump (35) along a revolving frame (8). Therefore, a working space for performing operational work can be formed between the closed-circuit pipe group (30) and the open-circuit pipe group (36).
Claims5
A construction machine comprising:
- a vehicle body frame;
- a working mechanism provided on the vehicle body frame;
- a prime mover provided on the vehicle body frame;
- a housing with an upper structure covering the prime mover from above;
- a hydraulic actuator driving the working mechanism;
- a closed circuit system including a closed-circuit hydraulic pump driven by the prime mover and a closed-circuit pipe group composed of a plurality of closed-circuit pipes connecting the closed-circuit hydraulic pump and the hydraulic actuator;
- and
- an open circuit system including an open-circuit hydraulic pump driven by the prime mover and an open-circuit pipe group composed of a plurality of open-circuit pipes connecting the open-circuit hydraulic pump and the plurality of closed-circuit pipes, wherein
- one pipe group of the closed-circuit pipe group and the open-circuit pipe group is distributed through upper positions of the closed-circuit hydraulic pump and the open-circuit hydraulic pump along the upper structure, and the other pipe group is distributed through lower positions of the closed-circuit hydraulic pump and the open-circuit hydraulic pump along the vehicle body frame.
Dependencies are inferred from the claim text.