Abstract: A torque transmitting device for an automotive transmission includes a clutch housing with a plurality of internal splines, a clutch hub with a plurality of external splines extending radially outwardly from the clutch hub, a plurality of friction plates with internal teeth and a first and a second surface. The first and second surface having a friction material disposed thereon and at least one of the internal teeth has an aperture and the plurality of internal teeth intermesh with the plurality of external splines on the outer surface of the clutch hub, a plurality of reaction plates having a plurality of external teeth and a first and a second surface. The plurality of external teeth intermesh with the plurality of internal splines in the clutch housing, and a spacer member disposed in the aperture separates a first of the friction plates from a second of the friction plates.

Abstract: The present invention is directed to apply plates, clutch plates, reaction plates and backing plates utilized of friction clutch packs, brake housings, clutch hubs, clutch housings, accumulators, spline sets, valve bodies and wear surfaces against which bushings, seals, springs and similar components slide and contact which are utilized in motor vehicle automatic transmissions, are fabricated of aluminum and include an electro ceramic coating deposited thereon. Such components exhibit reduced weight relative to similar components fabricated of steel as well as extended service life due to both the hardness and porosity of the ceramic coating.

Abstract: Friction clutch components, such as apply plates, reaction plates and backing plates for motor vehicle automatic transmissions, fabricated according to the present invention, have reduced weight and improved service life. Apply plates and reaction plates are fabricated of aluminum coated with a thin layer of thermally sprayed steel or ferrous material. Backing plates are fabricated of powdered metal aluminum, stamped and machined aluminum, forged and machined aluminum or extruded aluminum and also coated with a thin layer of thermally sprayed steel or ferrous material. The thermally sprayed steel material may be a low carbon steel such as SAE 1008 or 1010 or a similar alloy. The plates are then finished by belt sanding, brushing or a similar surface finishing technique.