Mechanical Properties Analysis of Asymmetric Double Row Four-point-contact Slewing Bearing

doi:10.3901/JME.2018.09.177

Abstract

Abstract: Contact angle is an important design parameter of rolling bearing. It obviously affects the deformation, contact stress and working life of rolling bearing. Currently, the bearing space is limited, but load carrying capacity of the bearing is higher. In the paper, a new design of asymmetric contact angle(α₀₁=35°~60°,α₀₂=90°-α₀₁) double row four-point-contact slewing bearing is proposed based on the normal negative clearance and symmetric contact angle (α₀₁=α₀₂=45°) type. In order to accurately investigate the influence of the asymmetric contact angle on the load distribution, stiffness and carrying capacity, the mechanical model of the asymmetric double row four-point-contact bearing is firstly established. The results show that with the increase of the asymmetric contact angle, the number of four-point contact balls decreases at first and then increases, the maximum contact load of the bearing firstly decreases and then increases; under the action of one direction load, with the increase of the asymmetric contact angle, the axial stiffness K_aa of the bearing increases, the radial stiffness K_rr and angular stiffness K_θθ are the largest when the asymmetric contact angle is 60°, and are smallest when the asymmetric contact angle is 45°. Under combined load conditions, the main stiffness at asymmetric contact angles 45ånd 50åre significantly smaller than that at others. The auxiliary stiffness has obvious symmetry. Under the normal operating conditions, with the increases of the asymmetric contact angle α₀₁, the static carrying capacity of the bearing present a downward trend. Taking the static carrying capacity as the performance index, the asymmetric contact angle α₀₁=35°,α₀₂=55° is suitable.

Key words: asymmetric, contact angle, four-point-contact, slewing bearing

CLC Number:

THl33

NIU Rongjun, XU Jinchao, SHAO Xiuhua, DENG sier. Mechanical Properties Analysis of Asymmetric Double Row Four-point-contact Slewing Bearing[J]. Journal of Mechanical Engineering, 2018, 54(9): 177-186.

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