Vehicle Electronic Systems and Fault Diagnosis by Allan Bonnick

Author:Allan Bonnick [Bonnick, Allan]
Language: eng
Format: azw3
ISBN: 9781136076527
Publisher: Taylor and Francis
Published: 2014-06-11T04:00:00+00:00

4.4

Belt drive

We have already considered the kinematics of a belt drive in Chapter 1, application 1.2 and the static case of a belt and pulley in Chapter 3, application 3.5(b). Let us now consider the flat belt drive shown in Fig. 4.44 and take account of the dynamic effects when the drive runs at a constant speed. We will again assume that the belt is flexible and inextensible. The pulleys P1 and P2 will therefore have zero angular acceleration. Any element of belt in contact with a pulley will be moving on a circular path and its velocity will be constant in magnitude. It will therefore have an acceleration towards the centre of the pulley. Let us consider an element of belt on pulley P! as the pulley is just about to slip in the anti-clockwise direction relative to the belt. The forces on this element at the onset of slip are as shown in Fig. 4.45. As in the static case the element of belt subtends an angle δθ at the centre O1 of the pulley and N is the normal force/unit length applied to the belt by the pulley. The

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