F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/41.11
F15B 7/00 (2006.01) F04B 49/08 (2006.01) F16H 61/46 (2006.01)
Patent
CA 1229025
PRESSURE LIMITER Abstract A pressure limiter for a variable displacement pump of a hydrostatic transmission and which is remotely variable and operable to reduce pump stroke when a system pressure limit is exceeded to limit torque applied to an output shaft of the transmission. The pressure limiter has a valve with a valve member which senses system pressure and when system pressure exceeds a certain value the valve member operates to direct system pressure to a servo cylinder for the variable displacement pump to move the swashplate of the pump in a destroking direction. The pressure limiter valve has a spring acting on the valve member in a direction opposite to the force of system pressure and a piston is associated with the spring. A remotely set variable control pressure can be applied to the piston to vary the effective force of the spring and value of system pressure at which the pressure limiter valve will open to destroke the pump. Alternate embodiments provide for an absence of control pressure either establishing a minimum or maximum setting at which system pressure will be operative to open the pressure limiter valve.
462663
Riches Mckenzie & Herbert Llp
Sundstrand Corporation
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