COMPACT ACTUATOR WITH HYDRAULIC SEAL

WIPO Patent Application WO2002052159

A3

An actuator (36) for use in an active mount system includes a piston (72) disposed in a casing (66), and a piston rod assembly (70) that is connected to one of a vibrating component or its support structure. A seal assembly (74), disposed either in a groove in the piston or in a groove in the casing, provides a seal betwen the piston and casing. The seal assembly includes an annular seal member (94) comprising polytetrafluoroethylene resin, backing rings (96, 98), and an annular compression spring. The spring exerts force axially to compress the seal member, impelling the seal member to increase in dimension radially and maintain the seal between the piston and casing, and allows for volume expansion of the seal member with temperature. The piston may be barrel-shaped for use in a casing with a cylindrical interior surface, or the inner surface of the casing may define an hourglass-shape for use with a cylindrical piston.

WO/2015/109089	HUB-BASED ACTIVE VIBRATION CONTROL SYSTEMS, DEVICES, AND METHODS WITH OFFSET IMBALANCED ROTORS
WO/2016/192018	UAV HAVING BAROMETRIC SENSOR AND METHOD OF ISOLATING DISPOSING BAROMETRIC SENSOR WITHIN UAV
WO/2018/081802	INTEGRATED SMART SENSING SYSTEMS AND METHODS

TERPAY GREGORY W
ZIPFEL GEORGE G

PCT/US2001/049613

October 30, 2003

December 27, 2001

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GEN DYNAMICS ADVANCED TECHNOLO (US)

B64C27/00; F16F9/36; F16J9/06; F16J9/08; (IPC1-7): F16J15/56

US4477090A	1984-10-16
US2180795A	1939-11-21
US4306728A	1981-12-22
USRE33003E	1989-08-01

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