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公开(公告)号：US20230113111A1
公开(公告)日：2023-04-13
申请号：US17796438
申请日：2021-02-19
Applicant: Komatsu Ltd.
Inventor： Yuichi Hishinuma , Shinobu Nagura
Abstract: A hydraulic system includes: an arm hydraulic cylinder; a first hydraulic pump and a second hydraulic pump; an arm first direction switching valve; an arm second direction switching valve; and a controller that controls an operation of the arm second direction switching valve when the arm hydraulic cylinder is extended and operated. Further, the arm first direction switching valve incorporates an arm regeneration passage capable of supplying oil when the arm hydraulic cylinder is extended and operated, and the controller monitors a pressure state of the arm hydraulic cylinder, and when determining that oil flow through the arm regeneration passage is possible, the controller blocks oil flow between the arm hydraulic cylinder and the arm second direction switching valve, and otherwise, the controller operates the arm second direction switching valve so that oil can be supplied from the second hydraulic pump to the bottom chamber.
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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：US11927205B2
公开(公告)日：2024-03-12
申请号：US17796438
申请日：2021-02-19
Applicant: Komatsu Ltd.
Inventor： Yuichi Hishinuma , Shinobu Nagura
IPC: F15B11/024 , E02F9/22 , F15B11/17
CPC classification number: F15B11/024 , E02F9/2239 , E02F9/2242 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B11/17 , E02F9/2217 , E02F9/2282 , F15B2201/51 , F15B2211/20546 , F15B2211/20576 , F15B2211/3056 , F15B2211/3133 , F15B2211/355 , F15B2211/6313 , F15B2211/6355
Abstract: A hydraulic system includes: an arm hydraulic cylinder; a first hydraulic pump and a second hydraulic pump; an arm first direction switching valve; an arm second direction switching valve; and a controller that controls an operation of the arm second direction switching valve when the arm hydraulic cylinder is extended and operated. Further, the arm first direction switching valve incorporates an arm regeneration passage capable of supplying oil when the arm hydraulic cylinder is extended and operated, and the controller monitors a pressure state of the arm hydraulic cylinder, and when determining that oil flow through the arm regeneration passage is possible, the controller blocks oil flow between the arm hydraulic cylinder and the arm second direction switching valve, and otherwise, the controller operates the arm second direction switching valve so that oil can be supplied from the second hydraulic pump to the bottom chamber.
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Patent Agency Ranking
公开(公告)号：US20180163888A1
公开(公告)日：2018-06-14
申请号：US15507503
申请日：2016-05-31
Applicant: Komatsu Ltd.
Inventor： Satoshi Ishikawa , Shinobu Nagura , Tomonobu Shioyasu , Hirokazu Endoh , Masayuki TAJIMA , Masayuki Hosaka
Abstract: A spool valve includes: a valve body that has a spool hole; and a spool disposed in the spool hole and movable in an axial direction, wherein the spool has a first large-diameter portion, and a small-diameter portion provided on one side in the axial direction of the first large-diameter portion, the first large-diameter portion has a first outer surface slidable with an inner surface of the spool hole, an end surface connected to an end portion at the one side in the axial direction of the first outer surface and to an end portion at the other side in the axial direction of an outer surface of the small-diameter portion, and a cutout portion provided on the end surface, and a bottom surface of the cutout portion is inclined toward the one side in the axial direction to approach a central axis of the spool.
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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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公开(公告)号：US10422437B2
公开(公告)日：2019-09-24
申请号：US15507503
申请日：2016-05-31
Applicant: Komatsu Ltd.
Inventor： Satoshi Ishikawa , Shinobu Nagura , Tomonobu Shioyasu , Hirokazu Endoh , Masayuki Tajima , Masayuki Hosaka
Abstract: A spool valve includes: a valve body that has a spool hole; and a spool disposed in the spool hole and movable in an axial direction, wherein the spool has a first large-diameter portion, and a small-diameter portion provided on one side in the axial direction of the first large-diameter portion, the first large-diameter portion has a first outer surface slidable with an inner surface of the spool hole, an end surface connected to an end portion at the one side in the axial direction of the first outer surface and to an end portion at the other side in the axial direction of an outer surface of the small-diameter portion, and a cutout portion provided on the end surface, and a bottom surface of the cutout portion is inclined toward the one side in the axial direction to approach a central axis of the spool.
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