Pressure accumulator
OwnerVianney RABHIinventor
Life of this patent
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Abstract
The fixed or variable displacement hydraulic motor-pump (1) includes a motor-pump central rotor (3) in which a hydraulic cylinder (14) is arranged, the rotor (3) being in sealed contact with an input-output spool valve (43) connecting the cylinder (14) with a motor-pump frame (2) while a hydraulic piston (13) moves in the cylinder (14) to push, using a hydraulic piston guided plunger (18), a tangential arm (22) articulated in the central rotor (3), and a tangential arm antifriction roller (28) on a motor-pump peripheral rotor (29) synchronized in rotation with the motor-pump central rotor (3).
Claims3
A pressure accumulator comprising at least one accumulator separator piston (72) able to move sealably in a blind accumulator cylinder (113), said piston (72) delimiting, with said cylinder (113), a gas compartment (116) containing a pressurized gas (115) and an oil compartment (117) containing a motor-pump oil (114), the latter compartment (117) being able to be connected with an input/output duct, characterized in that the oil compartment (117) includes an accumulator closing gate (73) that the accumulator separator piston (72) can press on an accumulator gate seat (74) by pushing on a high-stiffness gate spring (76) inserted between said piston (72) and said gate (73), so as to sealably isolate said compartment (117) from the input-output duct, said gate (73) cooperating—opposite the high-stiffness gate spring (76)—with a low-stiffness gate spring (75) that tends to separate said gate (73) from said seat (74).
Dependencies are inferred from the claim text.