Research on Safety Performance for Parking Mechanism on a 7-Speed Dual Clutch Transmission
Parking mechanism is a critical safety device in automatic vehicle transmission. Its safety features give a good indication of safety performance of AT vehicle. This chapter takes the parking mechanism on 7-speed dual clutch transmission as an example, us
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Abstract Parking mechanism is a critical safety device in automatic vehicle transmission. Its safety features give a good indication of safety performance of AT vehicle. This chapter takes the parking mechanism on 7-speed dual clutch transmission as an example, uses kinematics theory to analyze difference of travel times between parking pawl and parking gear. In order to verify the safety performance at high speed parking, a rigid-flexible coupling multi-body dynamic model is established with ADAMS software, based on which the non-linear analysis is conducted to key components of the parking mechanism with peak impact load at high speed parking as input. In addition, through combining mechanics theory and kinematics simulation, the critical friction coefficient is estimated from the aspect of self-locking performance, which serves as references for future design of parking mechanism.
Keywords Parking mechanism Difference of movement time Self-locking performance Impact load ADMAS Parking at high speed Critical friction coefficient
F2012-C02-015 L. Fu (&) D. Luo Y. Chen D. Luo F. Zhao Zhejiang Geely Automobile Research Institute Co., Ltd, Hangzhou, China e-mail: [email protected] Z. Qiu DSI Holdings Pty Limited, Springvale, Melbourne, VIC, Australia Y. Chen South China University of Technology, Guangzhou, China
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 193, DOI: 10.1007/978-3-642-33744-4_15, Ó Springer-Verlag Berlin Heidelberg 2013
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1 Introduction Parking mechanism is a critical safety system in automatic transmission. It is designed to break the vehicle reliably on a specific position or even on slope, and its safety performance is one of vehicle evaluation indicators. With the rapid development of the automotive industry, the method to combine theoretical analysis and computer simulation [1, 2], has been widely used on vehicle transmission research. However, due to lacking of auto transmission research in China, the research on Auto transmission parking mechanism is also conducted much less. Using the parking mechanism of 7-speed dual clutch transmission as an example, this chapter analyzed the movement time difference between the parking pawl and the parking gear based on the kinematics theory. In addition, the rigid-flexible coupling multi-body dynamic model is established with ADAMS and Pro/e software and the peak impact load under high speed ratcheting was found by simulation. This load is taken as the input condition to conduct nonlinear finite element analysis on key components of parking mechanism with considering of material nonlinearity and contact nonlinearity, to verify the strength of parking mechanism components under high speed ratcheting. Through a combination of mechanics theory and kinematics simulation, the critical friction coefficient of key components is analyzed. Consequently, the self-locking safety performance of parking mechanism is validated, which can
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