Control for hydrostatic transmissions

Details Control for hydrostatic transmissions Control for hydrostatic transmissions

F - Mech Eng,Light,Heat,Weapons

16

H

260/244.6

F16H 61/42 (2006.01)

Patent

CA 1054025

APPLICATION OF: Kenneth K. Knapp, Charles R. Cornell, and Edwin D. Hicks FOR: A CONTROL FOR HYDROSTATIC TRANSMISSIONS A B S T R A C T A control valve for a variable displacement pump or motor. The valve includes a pair of solenoids which are independently actuatable to port relatively high pressure fluid to their respective servo motor. A shuttle valve actuated by the high pressure fluid is used to simultaneously port the fluid from the other servo motor to a low pressure fluid source. A manual valving system is also provided having a pair of balls each biased into engagement with a seat to seal a passage to one of the servo motors. Movement of either ball off of its seat allows high pressure fluid to flow to the respective servo motor. The high pressure fluid actuates the shuttle valve to port fluid from the other servo motor to the low pressure fluid source.

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