Ford Global Technolgoies, LLC

Mark Davis

Dengfu Zhang

Akhter Uz Zaman

Hafiz Shafeek Khafagy

Derek Kinch

Lev Pekarsky

Robert J Miller

Robert Orley Burkhart

Joseph Scott Slayton

Benjamin Rupley

Pablo Davilla

Patrick Heikka

A sliding vane pump includes a fixed housing defining inlet and outlet ports and a sliding housing defining a cylindrical cavity and configured to slide within the fixed housing. The fixed housing and the sliding housing define a gap therebetween. A rotor is configured to rotate within the cylindrical cavity and has a plurality of vanes configured to seal against an inner circumferential wall of the cylindrical cavity to define a plurality of pumping chambers. A seal is located in the gap disposed between the fixed housing and the sliding housing to split the gap into first and second compensation chambers. The first chamber is fluidly connected to a first pumping chamber of the plurality of pumping chambers and the second chamber is connected to a second pumping chamber of the plurality of pumping chambers.

Sliding-pocket variable-displacement pump with compensation chambers

A transmission assembly including a clutch system, an accumulator, and a controller is provided. The clutch system may include a flow source. The accumulator may be selectively in communication with the flow source via a solenoid valve. The controller may be programmed to, responsive to detection of a vehicle stop and the accumulator charged below a predetermined threshold, output a command to open the solenoid valve to rapidly charge the accumulator from the flow source. The predetermined threshold may be an accumulator pressure between 700 kPa and 900 kPa. The controller may be further programmed to, responsive to detection of the accumulator being charged to or above the predetermined threshold, output a shut down command to an engine in communication with the transmission assembly and to output a close command to the solenoid valve. The flow source may be a pump out circuit or a line pressure circuit.

System and method of charging a transmission accumulator

A sliding vane pump includes a passageway that fluidly connects one or more pumping chambers to a side chamber. The passageway pressurizes the side chamber. This fluid pressure exerts a force that counteracts the force caused by pressure differences between the outlet pumping chambers and the inlet pumping chambers. At high speed, part of the side chamber is pressurized by the smallest volume outlet pumping chamber while another portion of the side chamber is pressurized by the largest volume outlet chamber. This results in a force counteracting an uncommanded displacement decrease of the pump.

Variable displacement vane pump

An accumulator includes a cylinder for containing a working fluid and a first volume of pressurized gas, the gas and fluid being separated by a displaceable piston and a first seal contacting the piston and the cylinder, a reservoir carried on the piston for containing a second volume of pressurized gas, and a device that permits gas flow from the second volume into the first volume.

Self replenishing accumulator

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Plymouth, MI, United States of America

Mark Davis