Abstract
The principal factors that affect the characteristics of contact problem between cam and follower vary enormously during the operating cycle of this mechanism. This includes radius of curvature, surface velocities and applied load. It has been found over the last decades that the mechanism operates under an extremely thin film of lubricant. Any practical improvement in the level of film thickness that separates the contacted surfaces represents an essential step towards a satisfactory design of the system. In this paper a detailed numerical study is presented for the cam and follower (flat-faced) lubrication including the effect of introducing an axial modification (parabolic shape) of the cam depth on the levels of film thickness and pressure distribution. This is achieved based on a point contact model for a cam and flat-faced follower system. The results reveal that the cam form of modification has considerable consequences on the level of predicted film thickness and pressure distribution as well as surface deformation.
Highlights
Acam follower is a mechanism in which the rotational motion is converted to an oscillating or reciprocating follower motion
Wang et al [13] investigated the elastohydrodynamic lubrication of an eccentric-tappet pair in terms of the surface waviness wave length and eccentricity, the results showed that the waviness has a significant fluctuation on the oil film characteristics
The analyses analyses of of the the lubrication lubrication of of cam-follower cam-follower mechanism mechanism are arecarried carriedout out based based on on aa numerical numerical solution for the Different parameters have been studied in this paper including solution for the elastohydrodynamic lubrication (EHL) contact problem
Summary
Acam follower is a mechanism in which the rotational motion (of the cam) is converted to an oscillating or reciprocating follower motion. As geometry mentioned and previously, a cam with a flat-face follower is studied in this paper which is should be mechanism, the the velocity of the contacting surfaces in addition to the load shown in the schematic diagram of Figure 1. In order to study the EHL contact problem at the determined at the instant under investigation These variables depend on the profile of the cam, its cam-follower mechanism, the geometry and the velocity of the contacting surfaces in addition to the rotational load speed andbethe specification of theunder follower. For the point contact EHL solution, the equivalent radius of curvature of the maximum sliding velocity occurs at the cam nose, so that this will be one of the regions which will contacting surfaces is used as following be studied in terms of EHL point of view.
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