Clatter and rattle noise is an increasing challenge for the development of low-noise transmissions. Efforts to reduce fuel consumption and exhaust emissions of combustion engines combined with a decrease of the idle speed cause increasing cyclic irregularities within modern drivelines which result in an increasing clatter and rattle noise. Numerous external and internal measures for the reduction of clatter and rattle noise propensity have been developed; however only a few were applied to series products. This paper publishes potential measures for this noise reduction. New grounds were broken in the field of clatter and rattle noise free automotive transmissions by decoupling all gears which are not in the power flow. On the basis of a patented solution (CARF-Transmission) the clatter and rattle noise free transmission is presented as well as derived developments.

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