Control systems for variable capacity hydraulic machines

Details Control systems for variable capacity hydraulic machines Control systems for variable capacity hydraulic machines

1975-11-17

1977-03-22

Croyle, Carlton R.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

60444, F04B 126

Patent

active

040133800

ABSTRACT:
A hydraulic machine is provided with a control for reducing the capacity of the machine when subjected to excessive pressure.
A piston is slidable in a cylinder to define two chambers, the chambers being interconnected by a restrictive passage. One chamber is connected to the pressure line and the other chamber is connected to a relief valve so that in the steady state the pressure in each is equal. When the pressure reaches a predetermined level the relief valve opens and vents the other chamber. The passage prevents flow to the other chamber creating a pressure differential which causes the piston to move along the cylinder and operate the machine control to decrease the capacity thereof.

REFERENCES:
patent: 2932948 (1960-04-01), Neff et al.
patent: 3057162 (1962-10-01), Lee
patent: 3217493 (1965-11-01), Kempson et al.
patent: 3266434 (1966-08-01), McAlvay
patent: 3660975 (1972-05-01), Martin et al.
patent: 3672166 (1972-06-01), Isaac
patent: 3736073 (1973-05-01), Walmsley
patent: 3861832 (1975-01-01), Pinson

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