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

IPC: E02F9/22 ,  E02F9/12 ,  E02F9/26 ,  F15B13/02 ,  F15B15/18

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.

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

IPC: E02F9/22 ,  E02F9/12 ,  E02F9/26 ,  F15B13/02

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.