Variable displacement pump having a rotating cam ring
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United States of America Patent
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Jun 3, 2014
Grant Date -
Jun 11, 2009
app pub date -
Feb 16, 2009
filing date -
Apr 5, 2001
priority date (Note) -
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Abstract
Vane pump mechanical losses are reduced by removing vane friction losses and replacing them with lower magnitude journal bearing fluid film viscous drag losses. A freely rotating cam ring is supported by a journal bearing. A relatively low sliding velocity is imposed between the cam ring and the vanes. This permits the use of less expensive and less brittle materials in the pump by allowing the pump to operate at much higher speeds without concern for exceeding vane tip velocity limits.
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