Magna Powertrain Inc

Magra Powertrain of America, Inc.

Magna Powertrain of America, Inc.

Karthikeyan Ganesan

Matthew Williamson

Cezar Tanasuca

Liping Wang

Manmohan Sehmby

Vladimir Vukas

Jianwen Li

A variable capacity vane pump () is provided having a pump control ring () that is moveable to alter the capacity of the pump (). A control chamber () is formed between the pump casing () and the control ring (). The control chamber () is operable to receive pressurized fluid to create a force to move the control ring () to reduce the volumetric capacity of the pump (). A primary return spring () acts between the control ring () and the casing () to bias the control ring () towards a position of maximum volumetric capacity. A shaft is coupled at one end to the control ring and a second end of the shaft is positioned a predetermined distance from the casing (). A secondary return spring () is mounted about the shaft and is configured to engage the control ring () after the control ring () has moved a predetermined amount. The secondary return spring () biases the control ring () towards a position of maximum volumetric capacity. The secondary return spring () acts against the force of the control chamber () to establish a second equilibrium pressure.

Pre-compression dual spring pump control

A pressure relief valve includes a housing including an inlet chamber adapted to be in communication with an outlet of a pump and an outlet chamber adapted to be in communication with a pump inlet. The housing includes a bore having a first end in communication with the inlet chamber and a main spill aperture in communication with the bore and the outlet chamber. A piston includes an orifice and an axially spaced apart aperture. The piston is axially moveable within the bore between a first position whereat the piston seals the inlet chamber from the outlet chamber, a second position whereat the inlet and outlet chambers are in fluid communication with one another via only the orifice, and a third position whereat the inlet and outlet chambers are in fluid communication with one another via the orifice and the aperture. A spring biases the piston toward the first position.

Pressure relief valve with orifice

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North York, Canada

Karthikeyan Ganesan