Sundstrand Corporation

Thomas W Baehler

Henry R Vanderzyden

Wayne A Flygare

Victor N Benson

Kenneth N Baker

This invention relates to a piston for reciprocating and simultaneously rotating through a predetermined length of movement within a piston bore having a piston bore surface, and a method for reducing wear on a piston bore surface operatively associated with a piston which is subject to cocking forces. The piston includes a means on its extreme portion for providing continuous, tangential cooperation with the piston bore surface within the predetermined length of piston movement to reduce wear on the piston bore surface.

Piston and method for reducing wear

A method of increasing service life of an oil comprises placing a quantity of oil within a circuit, and placing a filter in the circuit, the filter having surfaces including interstices which contain a quantity of a liquid additive at a time of placement in the circuit, the additive being washed from the interstices of the filter into solution with the oil during filling and operation of the circuit to form a mixture of the oil and additive which reduces the formation of metallo-organic soaps. The oil may be an synthetic ester based oil or a mineral oil. The additive either reacts with an organic acid formed from hydrolysis of the oil during operation of the circuit to neutralize the acid, or alternatively the additive coats metallic wear particles formed during operation of the circuit so that organic acids formed from hydrolysis of the oil during operation of the circuit cannot attach thereto. A filter in accordance with the instant invention comprises an input for receiving oil and an output for discharging oil, and an element through which oil flows from the input to the output with the element having surfaces including interstices which contain a quantity of liquid additive at a time of placement in the circuit, the quantity of liquid additive being washed from the interstices of the filter into solution with the oil during filling and operation of an oil circuit to form a mixture of the oil and additive which reduces the formation of metallo-organic soaps.

Method of increasing service life of oil and a filter for use therewith

A method of increasing service life of an oil and a filter in a transmission which converts a variable speed input (10) into a constant speed output (14 or 20) for driving an generator (16 or 22) producing constant frequency power in an airframe in accordance with the invention utilizes a filter having interstices wetted prior to placement in an oil circuit (24) with a quantity of a liquid additive that is washed from the interstices of the filter into solution with the oil during filling and/or operation of the transmission to form a mixture of the oil and additive which reduces the formation of metallo-organic soaps and solids, that are retained in the interstices of the filter.

Method of increasing service life of synthetic oil and an apparatus for

A method of increasing service life of an oil and a filter in a transmission which converts a variable speed input (10) into a constant speed output (14 or 20) for driving an a generator (16 or 22) producing constant frequency power in an airframe in accordance with the invention utilizes a filter having interstices wetted prior to placement in an oil circuit (24) with a quantity of a liquid additive that is washed from the interstices of the filter into solution with the oil during filling and/or operation of the transmission to form a mixture of the oil and additive which reduces the formation of metallo-organic soaps and solids, that are retained in the interstices of the filter.

Method of increasing service life of oil and a filter in an integrated

Inefficiencies in electrical starter-generator systems for turbine engines are avoided in a construction including a dynamoelectric machine 16 operable as a motor or as a generator and having a rotor 26, a hydraulic torque converter 70 including an impeller 80 connected to the rotor 26 and a turbine 86. A system 94, 96 is provided for selectively providing hydraulic fluid to the torque converter 70 and a constant speed drive 112, 142, 144 is included. Overrunning clutches 108 and 158 interconnect the turbine 86 and an input for the constant speed drive for allowing the input to overrun the turbine 86 but not the reverse, and for interconnecting the rotor 26 and an output 130 of the constant speed drive for allowing the rotor 26 to overrun the output 130.

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Rockford, IL, United States of America

Thomas W Baehler