By Avraham Harnoy
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The diameter of the gear pitch circle is dp ¼ 5 in. Remark. The gear pressure angle f (PA) is the angle between the line of force action (normal to the contact area) and the direction of the velocity at the pitch point (see Fig. 1-7). Two standard pressure angles f for common involute gears are f ¼ 20 and f ¼ 14:5 . Detailed explanation of the geometry of gears is included in many machine design textbooks, such as Machine Design, by Deutschman et al. (1975), or Machine Design, by Norton (1996).
Failure of a motor vehicle engine, although it is highly undesirable, does not involve risk of loss of life; therefore, hydrodynamic bearings are commonly used in motor vehicle engines for their superior performance and particularly for their relatively long operation life. A third important disadvantage is that the hydrodynamic journal bearing has a low stiffness to radial displacement of the journal (low resistance to radial run-out), particularly when the eccentricity is low. , machine tools.
2 DRY AND BOUNDARY LUBRICATION BEARINGS Whenever the load on the bearing is light and the shaft speed is low, wear is not a critical problem and a sleeve bearing or plane-slider lubricated by a very thin layer of oil (boundary lubrication) can be adequate. Sintered bronzes with additives of other elements are widely used as bearing materials. Liquid or solid lubricants are often inserted into the porosity of the material and make it self-lubricated. However, in heavy-duty machinery—namely, bearings operating for long periods of time under heavy load relative to the contact area and at high speeds—better bearing types should be selected to prevent excessive wear rates and to achieve acceptable bearing life.