Abstract: In one embodiment, a torque converter is provided with a fluid coupling and a viscous coupling. The viscous coupling includes a plurality of closely-spaced surfaces, wherein facing ones of the closely-spaced surfaces are alternately splined to rotate with driving or driven elements of the torque converter, and wherein the closely-spaced surfaces have an average spacing that causes ones of the surfaces rotating with the driving elements to exert a viscous pull on ones of the surfaces rotating with the driven elements when the torque converter is filled with a viscous fluid. A fluid receiving portion of the torque converter receives a viscous fluid into the torque converter, and a fluid return portion expels the viscous fluid from the torque converter.

Abstract: In one embodiment, a torque converter includes a two-piece cover, an impeller, a turbine, and a lockup clutch. The two-piece cover includes a base plate that is configured for attachment to a drive member. The base plate has a plurality of lugs around the periphery thereof, and at least some of the lugs have straight flanks. The two-piece cover also includes a cylindrical wall piece that is fixed to the base plate. The impeller is fixed to the cylindrical wall piece. The turbine is rotationally mounted between the impeller and the cover and is configured for attachment to a driven member. The lockup clutch is configured to lock the impeller and cover to the turbine when a fluid pressure applied to the lockup clutch increases above a torque converter lockup pressure.

Abstract: In one embodiment, a torque converter is provided with a fluid coupling and a viscous coupling. The viscous coupling includes a plurality of closely-spaced surfaces, wherein facing ones of the closely-spaced surfaces are alternately splined to rotate with driving or driven elements of the torque converter, and wherein the closely-spaced surfaces have an average spacing that causes ones of the surfaces rotating with the driving elements to exert a viscous pull on ones of the surfaces rotating with the driven elements when the torque converter is filled with a viscous fluid. A fluid receiving portion of the torque converter receives a viscous fluid into the torque converter, and a fluid return portion expels the viscous fluid from the torque converter.

Abstract: A torque converter is provided with an impeller and a cover, fixed to one another and configured for attachment to a drive member. A turbine is rotationally mounted between the impeller and the cover and is configured for attachment to a driven member. A lockup clutch is provided to lock the impeller and cover to the turbine when a fluid pressure applied to the lockup clutch increases above a torque converter lockup pressure. The lockup clutch may include a clutch-pack having rings that are splined to the piston or to the cover via tabs. The flanks of the tabs and their corresponding lugs may be substantially radial, or the flanks of the tabs or lugs may be parallel to one another. The cover may be formed from a base plate and a cylindrical wall piece. A plurality of lugs may be formed around the periphery of the base plate, and ones of the tabs may be splined thereto.

Abstract: A torque converter is provided with an impeller and a cover, fixed to one another and configured for attachment to a drive member. A turbine is rotationally mounted between the impeller and the cover and is configured for attachment to a driven member. A lockup clutch is provided to lock the impeller and cover to the turbine when a fluid pressure applied to the lockup clutch increases above a torque converter lockup pressure. The lockup clutch may include a clutch-pack having rings that are splined to the piston or to the cover via tabs. The flanks of the tabs and their corresponding lugs may be substantially radial, or the flanks of the tabs or lugs may be parallel to one another. The cover may be formed from a base plate and a cylindrical wall piece. A plurality of lugs may be formed around the periphery of the base plate, and ones of the tabs may be splined thereto.