Washer pump
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United States of America Patent
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Apr 1, 2014
Grant Date -
Feb 21, 2013
app pub date -
Oct 26, 2012
filing date -
Jun 9, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An improved automotive pump assembly includes a volute pumping chamber configured to operably contain a rotatable impeller which, when driven, draws fluid into a fluid inlet and pumps the fluid to and through a fluid outlet. The volute chamber has an exterior sidewall with a constant internal first radius over a first sidewall portion and transitions to a second sidewall portion of increasing radius. The chamber's second sidewall portion defines a first end at a sidewall transition point tangent to the constant radius sidewall segment to define a second end which is tangent to the volute chamber's fluid outlet with a second radius that is greater than the first radius.
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