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公开(公告)号：EP4506511A1
公开(公告)日：2025-02-12
申请号：EP23780388.7
申请日：2023-03-27
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： YANASE, Yoshitaka , OKANO, Hajime , MURAYAMA, Yuuji
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).
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公开(公告)号：EP4424923A1
公开(公告)日：2024-09-04
申请号：EP23779881.4
申请日：2023-03-21
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： OKANO, Hajime , MURAYAMA, Yuuji , YANASE, Yoshitaka
Abstract: A manifold (33) of a closed-circuit control valve device (32) disposed rearward of a left revolving hydraulic motor (8) includes a valve attachment area (33E) provided at a central portion of the manifold (33) in the right-and-left direction and including a control valve (34) mounted therein and a pipe attachment area (33F) provided outward of the valve attachment area (33E) in the right-and-left direction and including a closed-circuit actuator side pipe (47) mounted therein. A manifold (42) of an open-circuit control valve device (41) disposed rearward of a right revolving hydraulic motor (9) includes a valve attachment area (42E) provided at a central portion of the manifold (42) in the right-and-left direction and mounted a control valve (43) and a pipe attachment area (42F) provided outward of the valve attachment area (42E) in the right-and-left direction and mounted an open-circuit actuator side pipe (48).
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公开(公告)号：EP4484651A1
公开(公告)日：2025-01-01
申请号：EP23788181.8
申请日：2023-03-31
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： HONDA, Takeshi , OKANO, Hajime , MURAYAMA, Yuuji , YANASE, Yoshitaka
Abstract: A control valve (23) for travel is provided in a lower traveling structure (15) to control the flow of operating oil to be delivered to a hydraulic motor (20) for travel from a hydraulic pump (10). An operating oil tank (12) and the hydraulic motor (20) for travel is connected by a hydraulic pipe (25). The hydraulic pipe (25) is configured of a supply low-pressure pipe part (25A), a pump-side high-pressure pipe part (25B) and a valve-side high-pressure pipe part (25C) for connection between the operating oil tank (12), the hydraulic pump (10) and the control valve (23) for travel, switching high-pressure pipe parts (25D, 25E) that are provided in the lower traveling structure (15) for connection between the control valve (23) for travel motor and the hydraulic motor (20) for travel, and a valve-side low-pressure pipe part (25F) and a tank-side low-pressure pipe part (25G) that are provided across from the lower traveling structure (15) to the upper revolving structure (3) to establish connection between the control valve (23) for travel motor and the operating oil tank (12).
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公开(公告)号：EP4461882A1
公开(公告)日：2024-11-13
申请号：EP23780390.3
申请日：2023-03-27
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： OKANO, Hajime , MURAYAMA, Yuuji , YANASE, Yoshitaka
Abstract: A plurality of control valves (39A to 39D, 40A to 40D, 41A to 41D, 42A to 42D, 43) is aligned and disposed in the right-and-left direction and in the vertical direction on a first mounting surface (38C) and a second mounting surface (38D). Further, a plurality of control valves (47, 48) is aligned and disposed in the right-and-left direction and in the vertical direction on a first mounting surface (46B) and a second mounting surface (46C) .
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