Method and apparatus for removing pressure peaks and damping hydraulic pressure waves and peaks from pressure variations in the feed ducts of a hydraulic pump and a pump for implementing the method
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United States of America Patent
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May 27, 1986
Grant Date -
N/A
app pub date -
Mar 27, 1985
filing date -
Mar 29, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of damping hydraulic pressure waves and of removing peaks from pressure variations in the feed ducts of a hydraulic pump resulting from excess fluid returned with high kinetic energy to a feed chamber uses this kinetic energy directly to increase temporarily the volume of the feed chamber by a value lying in the range 10% to 30% of the maximum cylinder capacity of the hydraulic pump. The pump has a resiliently movable wall disposed in a feed chamber perpendicularly to the direction of a high kinetic energy jet of fluid from a passageway opening into the chamber. The wall is located on the axis of the passageway at a distance from the opening that is not more than 1.5 times the smallest diameter of the passageway. The invention also relates to a hydraulic pump for implementing the method. Applicable to fuel injection pumps in Diesel engines.
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