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公开(公告)号：US20240117600A1
公开(公告)日：2024-04-11
申请号：US18275890
申请日：2022-02-28
Applicant: Komatsu Ltd.
Inventor： Wataru Sumino , Shinobu Nagura , Yuuki Yokoyama , Masatoshi Ikeda
CPC classification number: E02F9/2217 , E02F9/123 , E02F9/2228 , E02F9/26 , F15B13/02 , F15B15/18 , E02F9/2285 , E02F9/2292 , E02F9/2296
Abstract: An excavator includes: a swing motor driven by oil from a swing pump coupled to a power take-off and driven by an engine; a first main oil passage connecting a first discharge port of the swing pump and a first suction port of the swing motor; a second main oil passage connecting a second discharge port of the swing pump and a second suction port of the swing motor; a neutral retention valve disposed in the first main oil passage and the second main oil passage and controlling passage of oil; a regenerative energy absorbing device coupled to the power take-off and absorbs regenerative energy generated by oil from the swing motor to the swing pump via a meter-out opening of the neutral retention valve; and a valve control section controlling an area of the meter-out opening based on a state of the regenerative energy absorbing device.
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公开(公告)号：US20240093467A1
公开(公告)日：2024-03-21
申请号：US18275092
申请日：2022-02-28
Applicant: Komatsu Ltd.
Inventor： Wataru Sumino , Shinobu Nagura , Yuichi Hishinuma
CPC classification number: E02F9/2242 , E02F3/435
Abstract: A hydraulic system of an excavator includes a work state determination unit and a valve control unit. When it is determined that a work state of working equipment is a heavy excavation state, the valve control unit controls a first boom operation valve, a first arm operation valve, a first bucket operation valve, a second boom operation valve, a second arm operation valve, and a second bucket operation valve such that passing of hydraulic oil from a first hydraulic pump to a boom cylinder is restricted, hydraulic oil is supplied from a second hydraulic pump to a boom cylinder, hydraulic oil is supplied from both the first hydraulic pump and the second hydraulic pump to an arm cylinder, and hydraulic oil is supplied from one or both of the first hydraulic pump and the second hydraulic pump to a bucket cylinder.
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公开(公告)号：US12168857B2
公开(公告)日：2024-12-17
申请号：US18275890
申请日：2022-02-28
Applicant: Komatsu Ltd.
Inventor： Wataru Sumino , Shinobu Nagura , Yuuki Yokoyama , Masatoshi Ikeda
Abstract: An excavator includes: a swing motor driven by oil from a swing pump coupled to a power take-off and driven by an engine; a first main oil passage connecting a first discharge port of the swing pump and a first suction port of the swing motor; a second main oil passage connecting a second discharge port of the swing pump and a second suction port of the swing motor; a neutral retention valve disposed in the first main oil passage and the second main oil passage and controlling passage of oil; a regenerative energy absorbing device coupled to the power take-off and absorbs regenerative energy generated by oil from the swing motor to the swing pump via a meter-out opening of the neutral retention valve; and a valve control section controlling an area of the meter-out opening based on a state of the regenerative energy absorbing device.
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公开(公告)号：US12084837B2
公开(公告)日：2024-09-10
申请号：US18275092
申请日：2022-02-28
Applicant: Komatsu Ltd.
Inventor： Wataru Sumino , Shinobu Nagura , Yuichi Hishinuma
CPC classification number: E02F9/2242 , E02F3/435
Abstract: A hydraulic system of an excavator includes a work state determination unit and a valve control unit. When it is determined that a work state of working equipment is a heavy excavation state, the valve control unit controls a first boom operation valve, a first arm operation valve, a first bucket operation valve, a second boom operation valve, a second arm operation valve, and a second bucket operation valve such that passing of hydraulic oil from a first hydraulic pump to a boom cylinder is restricted, hydraulic oil is supplied from a second hydraulic pump to a boom cylinder, hydraulic oil is supplied from both the first hydraulic pump and the second hydraulic pump to an arm cylinder, and hydraulic oil is supplied from one or both of the first hydraulic pump and the second hydraulic pump to a bucket cylinder.
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