Method and apparatus for removing pressure peaks and damping hyd

Pumps – Expansible chamber type – Pumping member position controlled port

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123447, F02M 5944

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active

045913218

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.

REFERENCES:
patent: 1993759 (1935-03-01), Stockmeyer
patent: 4526149 (1985-07-01), Hafele et al.
patent: 4526150 (1985-07-01), Guntert et al.

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