公开(公告)号：US12006193B2

公开(公告)日：2024-06-11

申请号：US17636178

申请日：2020-08-28

申请人： KOBELCO CONSTRUCTION MACHINERY CO., LTD.

发明人： Takuro Kishi ,  Toshimitsu Takamori ,  Taisuke Tsunoo ,  Yoshiki Kamon ,  Kenichi Terauchi

IPC分类号： B66D5/26 ,  B66D1/16

CPC分类号： B66D5/26 ,  B66D1/16

摘要： Provided is a work machine capable of effectively discharging air from a hydraulic circuit of a winch unit capable of applying braking to a winch drum by receiving a working oil. The work machine includes: a winch unit having a winch drum, a winch motor, a cylinder portion and a clutch portion; a hydraulic sources; a braking operating unit; a brake valve; a connecting portion; and a throttle portion. The throttle portion includes an opening having an opening diameter that is set so as to hold a pressure in a positive oil chamber for generating a brake force applied to the winch drum and to discharge a working oil from the positive oil chamber.