Thermal and Dynamic Characterization of Wet Clutch Engagement With Provision for Drive Torque

Abstract

Wet clutches that handle the gearshifts in automatic transmission undergo severe thermal stresses due to the occurrence of large temperature gradients during engagement. To accurately design wet clutches, better models to simulate the engagement process are needed. This work presents a finite element model for simulating wet clutch engagements. The total friction coefficient was used to describe the different lubrication regimes that a wet clutch engagement undergoes. The model also includes provision for drive torque that realistically simulates the engine torque of a car. The results of the simulations are successfully verified by comparison with laboratory experiments on a testrig specially designed to accommodate the drive torque, covering a wide range of typical engagements. Excellent agreement between experiment and simulations is reported in terms of both the dynamics of the engagement and the thermal characteristics. The results are indicative of the utility of the model as a useful engineering tool.

Friction Characteristics of Synchronization Process Based on Tribo‐Thermodynamics

“…e distribution of the heat ux between the synchronizer ring and the conical surface is related to their material properties directly. According to the relevant conclusions [15,16], the heat ux distribution ratio between upper and lower specimens is…”

Simulation and Experimental Studies on the Temperature Field of a Wet Shift Clutch during One Engagement

“…So it is important to do research on the temperature distribution of the frictional pair during gear shifting. So far, a lot of researchers have done much work on temperature rise of frictional pairs in the wet clutch and the temperature distribution on the steel plate was presented and discussed [1]- [4]. Most of the researchers use the theoretical methods or commercial FEM software to solve such problems.…”

Experimental and numerical studies on periodic convection flow and heat transfer in a lid-driven arc-shape cavity

“…In recent years, the heat transfer performance of lid-driven cavity flows has developed substantial importance due to its extensive engineering applications such as heat exchangers, electronic cooling, solar collectors and grooved wet clutches [1][2][3][4]. Prasad and Koseff [5] conducted an experimental investigation of mixed convection heat transfer in an insulated lid-driven rectangular cavity.…”