Method of preventing cavitation in an axial piston pump during an aiding load and system and valve employing the same
AssigneeSundstrand Corporation
InventorMagdy A. Kandil
Life of this patent
Estimating the term…
Abstract
Cavitation in axial piston motors (20) caused to act as a pump by an aiding load (28), and the related difficulty of loss of hydrostatic film (52), and tipping or hammering of motor slippers (64), can be reduced by a method which includes the step of recirculating hydraulic fluid from the supply port (18) of the motor (20) to the return port (30) of the motor (20) upon the occurrence of an aiding load (28).
Claims13
In a hydraulic system including a fluid reservoir, a hydraulic supply pump connected to the reservoir, an axial piston hydraulic motor adapted to drive a load or be driven by a load and including supply return and case ports, the supply port being connected to said pump, the case port being connected to said reservoir and the return port being connectable to said reservoir, means for preventing cavitation in said motor when said motor is being driven by a load and comprising:
- first means for connecting said return port to said reservoir when pressure at said return port exceeds pressure at said case port by a predetermined amount;
- and
- second means for connecting said return port to said supply port when pressure at said case port exceeds pressure at said return port.
A method of preventing cavitation in a hydraulic motor of the axial piston type having a supply port and a return port and operable to act as a pump when subject to an aiding load, comprising the step of:
- recirculating hydraulic fluid from said supply port to said return port when said motor is subject to an aiding load.
Dependencies are inferred from the claim text.