公开(公告)号：US11905980B2

公开(公告)日：2024-02-20

申请号：US17614799

申请日：2020-05-26

申请人： Parker-Hannifin Corporation

发明人： Steven A. Krane ,  Dean R. Pollee ,  Scott N. Johns ,  David A. Scranton ,  Bernard J. Strehlow

IPC分类号： F15B20/00 ,  B64C13/42 ,  F15B3/00

CPC分类号： F15B20/004 ,  B64C13/42 ,  F15B3/00 ,  F15B2211/20507 ,  F15B2211/20538 ,  F15B2211/20569 ,  F15B2211/20592 ,  F15B2211/275 ,  F15B2211/40507 ,  F15B2211/41563 ,  F15B2211/50518 ,  F15B2211/50536 ,  F15B2211/50563 ,  F15B2211/5157 ,  F15B2211/6355 ,  F15B2211/7058 ,  F15B2211/7142 ,  F15B2211/8633 ,  F15B2211/875

摘要： A power transfer unit includes a first hydraulic circuit, a second hydraulic circuit fluidly connected to the first hydraulic circuit, a pump and motor assembly fluidly connected between the first hydraulic circuit and the second hydraulic circuit, an isolation valve arranged along the first hydraulic circuit and fluidly connected to an inlet of the pump and motor assembly. The isolation valve is movable between a closed position and an open position to prevent and enable high-pressure fluid flow to the inlet, respectively. An unloader valve is arranged along the second hydraulic circuit and fluidly connected to an outlet of the pump and motor assembly, and an orifice is arranged along the second hydraulic circuit and fluidly connected to the unloader valve to reduce back pressure in the second hydraulic circuit.

公开(公告)号：US20220228609A1

公开(公告)日：2022-07-21

申请号：US17614799

申请日：2020-05-26

申请人： Parker-Hannifin Corporation

发明人： Steven A. Krane ,  Dean R. Pollee ,  Scott N. Johns ,  David A. Scranton ,  Bernard J. Strehlow

IPC分类号： F15B20/00 ,  B64C13/42 ,  F15B3/00

摘要： A power transfer unit includes a first hydraulic circuit, a second hydraulic circuit fluidly connected to the first hydraulic circuit, a pump and motor assembly fluidly connected between the first hydraulic circuit and the second hydraulic circuit, an isolation valve arranged along the first hydraulic circuit and fluidly connected to an inlet of the pump and motor assembly. The isolation valve is movable between a closed position and an open position to prevent and enable high-pressure fluid flow to the inlet, respectively. An unloader valve is arranged along the second hydraulic circuit and fluidly connected to an outlet of the pump and motor assembly, and an orifice is arranged along the second hydraulic circuit and fluidly connected to the unloader valve to reduce back pressure in the second hydraulic circuit.