Oil pump resonator
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jan 17, 2012
Grant Date -
May 21, 2009
app pub date -
Oct 31, 2008
filing date -
Nov 19, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides an oil pump resonator in which various vibrations caused by pulsations that change in response to changes in oil pressure on a discharge port side can be attenuated by a resonator that comprises only one chamber, whereby the volume occupied by the resonator can be minimized. An oil pump in an engine, for feeding oil from a suction port to a discharge port through rotation of a rotor fitted in a pump housing, includes: a discharge flow channel communicating with the discharge port; a resonator comprising an introduction channel formed in the discharge flow channel and a chamber communicating with the introduction channel; and a piston having a leading end face section that makes up an inner wall face of the chamber, and reciprocating in response to pulsation changes. The piston slides so as to reduce the volume of the chamber as the frequency distribution of the pulsations becomes higher.
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