Motors: expansible chamber type – Differential
Patent
1975-01-31
1976-08-31
Cohan, Alan
Motors: expansible chamber type
Differential
91414, 13759613, 13759614, F15B 1306
Patent
active
039773019
ABSTRACT:
A fluid control circuit for regulating fluid flow between a pressurized fluid source and a hydraulic motor, including a control valve having a movable spool for communicating fluid entering an inlet chamber from the source with service chambers in communication with the motor, a dump valve limiting communication of the inlet chamber with a drain in response to spring means and fluid communicated to the dump valve through a passage open to either of the service chambers when it is placed in communication with the inlet chamber by the control valve spool, the passage otherwise communicating the dump valve with a drain so that fluid communication between the inlet chamber and drain is limited only by the spring means. The force of the spring means may also be varied in certain embodiments of the invention. During operation of a second hydraulic motor by an additional control valve in communication with the inlet chamber, the dump valve is conditioned to provide pressure modulation in the inlet chamber by means of a bypass valve responsive to the additional control valve.
REFERENCES:
patent: 2941547 (1960-06-01), Rood
patent: 3150685 (1964-09-01), Lohbauer et al.
patent: 3416561 (1968-12-01), Kokaly
patent: 3592216 (1971-07-01), McMillen
patent: 3605806 (1971-09-01), Coatti
Kroth Neil W.
Lohbauer Kenneth R.
Scheidt James E.
Caterpillar Tractor Co.
Cohan Alan
Michalsky Gerald A.
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