Device for temperature controlling of transmission oil of a motor vehicle

摘要

The cooler is based on a liquid-liquid heat-exchanger (1) having an inlet (2a) and outlet (2b) for the transmission oil, and another inlet (3a) and outlet (3b) for the engine coolant. A thermostatic valve (4) mixes the hot coolant (5a) with cooled coolant (5b) in the proportions necessary for the desired oil temperature. The valve incorporates a control piston (12) of expansible material in the oil inlet (2a) with a rod (10) carrying two valve discs (6a,6b) for varying the cross-sections (7a,7b) of the openings into the mixing chamber (8). A variant has two such pistons coupled together with electric heating elements.