By Pradeep K. Gupta (auth.)
In any rotating equipment method, the bearing has typically been a crit ical member of the full approach, because it is the part that enables the relative movement among the desk bound and relocating components. looking on the appliance, a few varied bearing varieties were used, corresponding to oil-lubricated hydrodynamic bearings, fuel bearings, magnetic suspensions, rolling point bearings, and so on. Hydrodynamic bearings provides any wanted load help, yet they're constrained in stiffness and the linked strength loss will be fairly huge. gasoline bearings are used for high-precision purposes the place the supported lots are particularly gentle, bearing strength losses are very low, and the rotating speeds in general excessive. For great precision parts the place no frictional dissipation or bearing strength loss might be tolerated, magnetic suspensions are hired; back, the burden aid standards are very low. Rolling point bearings were common for these functions that require higher bearing versatility, because of the requisites for high-load and high-stiffness features, whereas permitting average strength loss and allowing variable speeds. A research of the dynamic interplay of rolling parts is, for this reason, the topic of this article. Texts overlaying the research and layout technique of rolling parts are very constrained. striking works comprise research of Stresses and Deflections (Jones, 1946, Vols. I and II), Ball and curler Bearings, Their conception, layout and alertness (Eschmann, Hasbargen, and Weigand, 1958), Ball and curler Bearing Engineering (Palmgren, 1959, third ed. ), complicated Bearing know-how (Bisson and Anderson, 1965), and Rolling Bearing research (Harris, 1966).
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Additional resources for Advanced Dynamics of Rolling Elements
However, for a dry contact or for solid-lubricated conditions the point-to-point variation in the traction force must be considered and a generalized two-dimensional integration must be performed. In either case, for the computation of local slip, it will be necessary to determine the position vector locating any point P (see Rolling Element/Race Interactions 29 Figure 3-4) within the contact ellipse relative to the ball and race mass centers. 11 ) fis the race curvature factor, and d is the ball diameter.
When due to curvature of the ball/race interaction surface there are one or two points of pure rolling, the slip component changes sign; Figure 3-6 shows a typical variation. Because of this change in sign there is a corresponding discontinuity in K and a subdivision of the domain -1 :5: x:5: 1 into the two or three regions separated by the discontinuities becomes convenient. Numerical integration is then performed separately in each region and the results are summed. 14). Case 2: Two-Dimensional Variation in Traction.
It should be remembered that all of the above forces and moments are on a given elementary disk in the contact zone, and an integration over the contact zone will give the total force and moment vectors. As discussed earlier a simple trapezoidal rule is found to be adequate for computing the total roller/race interaction. 3 Roller/Race-Flange Interactions In a roller bearing subjected to slight misalignment, the loads between the roller and raceways may be somewhat asymmetric and, hence, the resulting tractions develop a moment about the transverse axis of the roller.
Advanced Dynamics of Rolling Elements by Pradeep K. Gupta (auth.)