首页|Contact Load and Stiffness of Four-Point Contact Ball Bearings Under Loading
Contact Load and Stiffness of Four-Point Contact Ball Bearings Under Loading
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NSTL
Korean Soc Precision Eng
Four-point contact ball bearings (X-ACBBs) are highly effective in applications requiring support for shafts that feature a high ratio of diameter to unsupported axial length and axial loading in two directions. In an effort to predict and understand problems that have been reported in X-ACCB usage, new modeling and analysis of the contact load and stiffness of X-ACBBs has been presented. The new model features a quasi-static model for X-ACBBs subjected to five degrees-of-freedom loading and displacement. The model was validated against numerical ball contact loads available in the literature. A numerical investigation was then performed to study the effects on ball contact loads and stiffness of rotational speed, external loads, and various geometric parameters of bearings such as arching dimension and unloaded contact angle. Under pure axial load, increasing the rotational speed causes an abrupt change in X-ACBB stiffness when the ball contact changes from two-point to three-point contact. Gyroscopic moment reduces the speed at which transition from two-point to three-point contact occurs. The dependence of X-ACBB stiffness on arching dimension and unloaded contact angle reveals that those parameters are critical for the design of X-ACBBs.
NSTL
Korean Soc Precision Eng
