Pressure limiter

Details Pressure limiter Pressure limiter

1983-10-17

1985-04-23

Look, Edward K.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

60444, 60452, F04B 4900

Patent

active

045127239

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.

REFERENCES:
patent: 1623431 (1927-04-01), McVoy
patent: 1974138 (1934-09-01), Ferris et al.
patent: 2944564 (1960-07-01), Pettey
patent: 3017897 (1962-01-01), Seguenot
patent: 3553962 (1971-01-01), Potter et al.
patent: 3585797 (1971-06-01), Moon
patent: 3637327 (1972-01-01), Kubiak
patent: 3659963 (1972-05-01), Jennings
patent: 4116587 (1978-09-01), Liesener
patent: 4212164 (1980-07-01), Young
patent: 4336003 (1982-06-01), Kramer et al.
patent: 4414882 (1983-11-01), Frei
Drawing of Hydraulics Inc. bearing a date 1-28-77.

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