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Analysis of the Gear Shift Mechanisms by R-R Chart Method
Technical Paper
2001-01-1163
ISSN: 0148-7191, e-ISSN: 2688-3627
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Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
A new point of view in automatic transmission is proposed by R-R chart, which is a new analytic method based on the linearity of planetary gear and gear shift mechanism. The R-R chart is a visual tool to describe the whole motion of each rotational element of planetary gears in relation to the gear shift mechanism. Therefore, anyone can easily find on R-R chart not only the substance of the gear shift mechanisms in present automatic transmissions but also new gear shift mechanisms for the future automatic transmissions. This paper shows that the R-R chart is unique in 4-speed automatic transmissions with fixed compound planetary gear sets. As a result of the R-R chart application, this paper classifies the fixed compound planetary gear sets with 4 elements into 12 sets and the gear shift mechanisms into 3 types. Also, 4 R-R characteristic equations are derived as a correlation between speed ratios in 4-speed automatic transmissions. This paper describes systematically the gear shift mechanisms for 5- and 6-speed automatic transmission by R-R chart. Finally, this paper introduces the new gear shift mechanism for 5-speed automatic transmission with 3 clutches and 1 brake.
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Citation
Park, J. and Oh, J., "Analysis of the Gear Shift Mechanisms by R-R Chart Method," SAE Technical Paper 2001-01-1163, 2001, https://doi.org/10.4271/2001-01-1163.Also In
SAE 2001 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V110-6; Published: 2002-09-15
Number: V110-6; Published: 2002-09-15
References
- Benford Howard L. Leising Maurice B. “The Lever Analogy: A New Tool in Transmission Analysis” SAE 810102
- Hsieh Hsin-I Tsai Lung-Wen “A Methodology for Enumeration of Clutching Sequences Associated with Epicyclic-Type Automatic Transmission Mechanisms” SAE 960719
- Oshidari Toshikazu Hattori Noboru Morimoto Yoshirou “A New Approach to Finding Optimum Planetary Gear Trains for Automatic Transmissions” SAE 930676
- Ross Craig S. Route William D. “A Method for Selecting Parallel-Connected Planetary Gear Train Arrangements for Automotive Automatic Transmissions” SAE 911941
- Asada Toshiyuki “Automatic Planetary Gear Transmission”
- Oshidari Toshikazu “Planetary Gear Drive with Intermeshing Planet Pinions in Multistage Automatic Transmission”
- Beim Rudolf “Multiple Speed Nonsynchronous Automatic Transmission for Motor vehicles”
- Lepelletier Pierre A.G. “Five Speed Three Planetary Gearsets Automatic Transmission for Passenger Cars”