Patent ID: 11905980
Assignee: PARKER-HANNIFIN CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 0:
1. A power transfer unit comprising:
a first hydraulic circuit;
a second hydraulic circuit operatively coupled 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, wherein 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 arranged along the second hydraulic circuit and fluidly connected to an outlet of the pump and motor assembly;
an orifice arranged along the second hydraulic circuit and fluidly connected to the unloader valve to reduce back pressure in the second hydraulic circuit; and
an arming valve arranged along the first hydraulic circuit for piloting the isolation valve, wherein the arming valve is a three-way normally open solenoid valve.