Pressure limiter
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Apr 23, 1985
Grant Date -
N/A
app pub date -
Oct 17, 1983
filing date -
Oct 17, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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