The Means Industries' one-way clutch is a planar ratcheting device offering technical advantages to the more conventional roller and sprag clutches which are widely used in today's automatic transmissions. The intricate shape of the notch and pocket plates would require costly milling and broaching if produced from wrought steel or a forging. These components are now being designed and manufactured with conventional powdered metal technology. Typical designs include materials such as FN-0205, FN-0208 and FN-0408. They are single pressed to a 7.0 g/cm~3 density range, then sintered and heat treated to obtain the required strength and wear resistance. This paper discusses the basic design concept, design stress limits, PM material selection and processing for these one-way clutch plates.
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