Abstract: An oil level control system uses an available pressure source to operate a fluid motor which is integrally connected with a reciprocating fluid pump. The pump has an inlet passage disposed at the desired oil level in a primary reservoir. A pair of one-way valves cooperate with the pump to draw oil, above the desired level, from the primary reservoir and deliver the oil to a secondary reservoir. A restricted drain back passage permits the fluid to return to the primary reservoir to ensure that the desired level is maintained. The fluid motor is connected with an accumulator such that the initial portion of the stroke is operated by the pressure source of the pump stroke. The motor is driven by pressurized fluid in the accumulator.

Abstract: An oil storage reservoir has a fluid flow passage which returns fluid to the main transmission reservoir. The storage reservoir is supplied with fluid by the transmission control system and the amount of fluid that returns to the main reservoir from the storage reservoir is controlled by a thermally responsive valve mechanism such that, as the fluid temperature increases, the flow passage is reduced so that the level of oil in the storage reservoir is increased. Thus, the change in fluid volume, due to temperature change, is accommodated by the storage tank as controlled by the thermally responsive valve.

Abstract: A lip type oil seal for a cylinder and piston arrangement, such as in a fluid clutch, wherein the seal separates two working chambers formed by the piston and cylinder. The seal has radial grooves formed in an annular surface facing one chamber, a flat annular sealing surface facing toward the other chamber, and a radial lip portion sealing on the circumference of the piston. The radial grooves permit fluid flow between the chambers when both chambers are exhausted after being pressurized. The flat annular sealing surface prevents fluid flow between the chambers when only the one chamber is pressurized and not exhausted.

Abstract: An automatic transmission power train including an improved torque-pressure transducer incorporating dual concentric outer turbine and inner transducer shafts, secured together at their input ends, and having a regulating valve mounted in the center of their output ends, with the axial movement of the regulating valve being controlled by a plurality of spring-loaded, axially aligned cam members, each having oppositely disposed tabs formed thereon for alternately extending through one set or both sets of oppositely disposed relatively movable longitudinal slots formed in the two shafts, with the spread of the cam members being changed by camming action in response to the relative twists of the concentric shafts, and the regulated transducer pressure thus produced being directed to a modulator valve assembly for transmittal to the conventional transmission shift valves.