Abstract
The dry friction clutch is an important part in vehicles, which has more than one function, but the most important function is to connect and disconnect the engine (driving part) with driven parts. This work presents a developed numerical solution applying a finite element technique in order to obtain results with high precision. A new three-dimensional model of a single-disc clutch operating in dry conditions was built from scratch. As the new model represents the real friction clutch including all details, the complexity in the geometry of the clutch is considered one of the difficulties that the researchers faced using the numerical solution. The thermal behaviour of the friction clutch during the slip phase was studied. Meanwhile, in the second part of this work, the transient thermal equations were derived from scratch to find the analytical solution for the thermal problem of a clutch disc in order to verify the numerical results. It was found, after comparison of the numerical results with analytical results, that the results of the numerical model are very accurate and the difference between them does not exceed 1%.
Highlights
This research paper consists of two parts, in the first part, a new 3D FE model of the dry friction clutch was built from scratch in order to enhance the numerical solution of the thermal problem during the slipping period
In the second part, a new analytical solution was obtained based on the methodical model that was derived from scratch to obtain the variation of temperature and used it to validate the new numerical model
FE model was built using a developed numerical approach after verifying the reliability of the temperature results of the clutch system during start-up based on the comparison made with new enhanced analytical solutions
Summary
Friction clutches constitute vital components in many applications such as vehicles, machines of productions, etc. An accurate and reliable stress analysis of the clutch system parts is one of the major concerns to the mechanical design engineers to ensure reliability and long-life operation. An accurate computation of thermal stresses and contact pressure is very difficult to obtain due to many complexities involved in this process such as the geometry of the clutch system, variation of material properties, coefficient of friction, surface roughness, etc. The high temperatures will appear on the contacting surfaces of the clutch’s elements, which lead to generate of high thermal stresses. These thermal stresses are responsible for several disadvantages such as surface cracks, permanent distortions, etc
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