A methodology is proposed herein to search for and synthesize feasible configurations of six-speed automatic transmissions based on planetary gear trains with two degrees of freedom. A screening rule is first proposed to search for workable two-degree-of-freedom planetary gear trains for six-speed automatic transmissions. Based on the requirement of clutch-to-clutch shifts, a new algorithm to classify and permute speed ratios for feasible clutching sequences is presented. Six feasible configurations of six-speed automatic transmissions are found using the proposed methodology. By using an exhaustive search method, the ten best combinations of the number of gear teeth for a specific planetary gear train are then obtained to minimize the differences between the set of desired speed ratios and that of speed ratios generated algorithmically. Finally, the mechanical efficiencies of the ten planetary gear trains are calculated for evaluation.
|Number of pages||15|
|Journal||Transactions of the Canadian Society for Mechanical Engineering|
|Publication status||Published - 2005 Jan 1|
All Science Journal Classification (ASJC) codes
- Mechanical Engineering