Oil pump

  • US 7,704,061 B2
  • Filed: 11/10/2004
  • Issued: 04/27/2010
  • Est. Priority Date: 11/17/2003
  • Status: Active Grant
First Claim
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1. An oil pump, comprising:

  • a plurality of pump chambers each having a volume varied by engine drive, the pump chambers pressurizing oil inhaled through an inlet port and discharging it through a pump chamber outlet port;

    a main passageway connected between the pump chamber outlet port and a housing outlet port;

    a branch passage connected between upstream and downstream sides of the main passageway at branch and confluent points, the branch passage being in a vicinity of the confluent point and being shifted in pulse-pressure phase with respect to the main passageway; and

    a pair of throttles, wherein the pair of throttles consists of throttles respectively provided at upstream and downstream end portions of the branch passage, the throttles being smaller in cross-sectional area than a general section of the branch passage which continuously extends and connects between the pair of the throttles between a branch point and a confluent point of the main passageway and the branch passage, wherein the throttles are provided, with respect to the main passageway and the branch passage, in the branch passage.

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