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Abstract
Thirty-two novel hybrid transmissions consisting of a Ravigneaux gear train and a single planetary gear train are synthesized using a creative design methodology based on graph-theory and the lever analogy method. The design process commences by identifying an existing transmission configuration which meets all of the design requirements. The chosen design is then used to synthesize all possible mechanism permutations which satisfy the design constraints. The feasible mechanisms which satisfy both the design requirements and the design constraints are converted into analogous levers. The levers which fail to provide the required operation modes of the hybrid transmission are eliminated and the remaining levers are assigned brakes and clutches in order to realize the final designs. The responsiveness of the new hybrid transmissions and the feasibility of the proposed design methodology are confirmed by analyzing the power flow and kinematics of one of the designs in all of the operation modes.
Highlights
The Ravigneaux gear train (RGT) is a double planetary gear set consisting of a ring gear, two sun gears and two planet gears [1]
Problem considered in the present study, it is necessary to perform a more robust design procedure for the hybrid transmissions (HTs) problem considered in the present study, it is necessary to perform a more robust design which considers the topological characteristics, and the placement of the inputs (INs) procedure which considers the topological characteristics, and the placement of the output (OUT), brakes (Bs) and clutches (CLs) needed to satisfy the required operating modes
For transmission systems formed by multiple simple planetary gear trains (SPGTs), the positions of the interconnect links between the components are used to convert the transmission into a set of corresponding analogous between the components are used to convert the transmission into a set of corresponding analogous levers leversusing usingthe themethod methoddescribed describedinin[12]
Summary
The Ravigneaux gear train (RGT) is a double planetary gear set consisting of a ring gear, two sun gears and two planet gears [1]. Graph employed theory to develop new creative design methodology forand mechanisms, while Yan configurations. Lever analogy method alsosets been widelywith used for and transmission [18] used a similar The approach to synthesize thehas graph of PGTs nine ten links, power flow The analysis, selection, and control. Presented a compound lever-based of multiple levers connected in parallel based on a consideration of the required number of ratios and methodology for Kim synthesizing optimala compound set of compound-split transmissionfor configurations for their magnitudes. 2-SPGT transmission with enhanced fuel economy and et al [21] presented an automated design process based onsystems the analogous lever method for realizing performance for light-duty trucks. HTs of configurations research focuses on conventional automatic transmissions consisting a RGT and SPGTthe andpresent a largestudy number of members. A total of 32 novel HT configurations are derived
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