Effect of angular misalignment on the stiffness of the double-row self-aligning ball bearing

Abstract

The double-row self-aligning ball bearing commonly runs with angular misalignment between the inner and outer rings, and the angular misalignment significantly affects the bearing performance. However, the effect of angular misalignment on the dynamic characteristics of the double-row self-aligning ball bearing has not been studied thoroughly. This paper investigates the effect of angular misalignment on the stiffness of the double-row self-aligning ball bearing. The quasi-static model for the double-row self-aligning ball bearing is established with five degrees of freedom, namely, three translational displacements along x, y, and z directions and two tilting angles around x-axis and y-axis. The internal clearance between balls and raceways is included in the presented model. The formulation of the three-dimensional stiffness matrix for the double-row self-aligning ball bearing is analytically derived, and is verified by comparing with the available dada in published literature. Finally, the stiffness of the double-row self-aligning ball bearing under various angular misalignment conditions is analyzed systematically. The results show that the tilting angles vary the contact angles and contact forces of the compressed balls in the double-row self-aligning ball bearing, thus affect the bearing stiffness; the bearing stiffness decreases with the internal clearance; the angular misalignment significantly impacts the stiffness of the bearing running at a low speed.

Characteristics of Duplex Angular Contact Ball Bearing with Combined External Loads and Angular Misalignment

“…Generally, inner ring misalignment can be divided into two cases: centroidal misalignment and angular misalignment [33,52]. However, as an important supporting component on the shaft, DACBB unavoidably runs in angular misalignment operating condition [35].…”

“…The results demonstrated that angular misalignment considerably changes the contact state and stiffness of ACBB, and further influences the performance of the bearing-rotor system. In addition, in the study of roller and self-aligning bearings, the misalignment phenomenon has also attracted much attention from scholars [33][34][35][36][37][38]. Xing et al [34] presented a theoretical model for spherical roller bearings by considering the angular and centroidal misalignments of bearing rings.…”

“…Xing et al [34] presented a theoretical model for spherical roller bearings by considering the angular and centroidal misalignments of bearing rings. Geng et al [35] proposed a five degree-of freedom quasi-static model for double-row self-aligning ball bearings and investigated the effect of angular misalignment on the dynamic characteristic of the bearing. Tong and Hong [36][37][38] completed a series works on the tapered roller bearings subjected to angular misalignment.…”

“…The stiffness and fatigue life of DACBB under angular misalignment were studied. Generally, owing to main shaft deflection, mounting error, and geometric inaccuracy, DACBB commonly runs with angular misalignment [35][36][37]52]. In order to control the magnitude of angular misalignment of inner ring, it is necessary to improve the machining and assembly accuracy of bearing, shaft, and bearing seat.…”

Effect of structural parameters and service conditions on the tilt angle of double row angular contact ball bearing

“…Xing et al 23 have studied the tilt angle of the self-aligning roller bearing, and the results show that the extra bending moment caused by the misalignment of the angle will be eliminated by the self-aligning ability of the self-aligning roller bearing, and the bearing capacity of the bearing will be reduced as the cost However, the bearing capacity of the bearing will be improved due to the appropriate axial load. Geng et al 24 have studied the tilt angle of double row self-aligning ball bearings and the results show that the tilt angle will significantly affect the stiffness of the bearing, which is mainly achieved by the contact characteristics between the roller and the raceway. The internal clearance of the bearing components and the tilt angle at low speed will also affect the stiffness of the bearing.…”