Oil-shear Drive Systems

  • G M Sommer
Part of the Mechanical Engineering Series book series (MECS)


Hydrodynamic forces in oil-lubricated bearings produce unwanted friction (drag) which causes some loss of efficiency. However, the principle has been put to use in the development of types of mechanical power drive in which torque is transmitted by the shear of an oil film between two surfaces. There are two main types of drive that use oil-shear. (1) Based on shear of an oil film between two flat surfaces (plates or discs); this type can be used for drive engagement/release (ie a clutch), for braking effect, or for a combined clutch/brake system. (2) Continuously variable drives in which an oil film is sheared to provide friction between rolling interfaces (eg rollers between flat or contoured surfaces). These types have been developed in various forms: the general principles and characteristics of each are discussed further in this chapter.


Output Shaft Friction Disc Power Shaft Variable Speed Drive Clutch Disc 
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  1. 1.
    W J Davies. An analysis of the function of modern adjustable-ratio drives; pt 1 mechanical drives. Power Transmission Design 1966 July.Google Scholar
  2. 2.
    T G Fellows, D Dawson, F G Perry, M A Plint. Perbury continuously variable ratio transmission. Symposium on automatic transmissions; advances in automobile engineering pt II; July 1963 (Cranfield, England). Reprinted Pergamon Press 1964.Google Scholar
  3. 3.
    A W Crook. The lubrication of rollers. Series of papers in Phil Trans Roy Soc, London Series A 1958, 1961, 1963.Google Scholar
  4. 4.
    L O Hewko, F G Rounds, R L Scott. Tractive capacity and efficiency of rolling contacts; rolling contact phenomena. Elsevier 1962.Google Scholar
  5. 5.
    I O MacConochie, A Cameron. The measurement of oil film thickness in gear teeth. Trans ASME 1960 v82 29.CrossRefGoogle Scholar
  6. 6.
    D Dowson, M D Longfield. Distribution of pressure and temperature in a highly loaded contact. IMechE Lubrication and wear convention 1963, May.Google Scholar
  7. 7.
    A J Barlow, J Lamb. Behaviour of lubricating oils under cyclic shearing stress. Proc Roy Soc Series A 1959 v253 52.Google Scholar
  8. 8.
    P Cahn-Speyer. Mechanical infinitely variable speed drives. The Engineers’ Digest 1953 Feb; 1971 Jan-Apr.Google Scholar
  9. 9.
    (a) J A Jefferis, K L Johnson. Sliding friction between lubricated rollers. (b) D Dowson, T L Whomes. Effect of surface quality on traction characteristics of lubricated cylindrical contacts. (c) M A Plint. Traction in elastohydrodynamic contacts. (d) K L Johnson, R Cameron. Shear behaviour of elastohydrodynamic oil films at high rolling contact pressures. IMechE Symposium 1967/8 v182 pt 1 no 14 281–330.Google Scholar

Copyright information

© Palgrave Macmillan, a division of Macmillan Publishers Limited 1971

Authors and Affiliations

  • G M Sommer
    • 1
  1. 1.G M Sommer Co IncChina

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