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Research Papers: Contact Mechanics

Experimental Study on Contact Force in a Slewing Bearing

[+] Author and Article Information
Guanci Chen

Faculty of Mechanical and Electrical Engineering,
Kunming University of Science and Technology,
Kunming 650500, China
e-mail: gcchen@kmust.edu.cn

Ge Wen, Zhengming Xiao, Hongjun San

Faculty of Mechanical and Electrical Engineering,
Kunming University of Science and Technology,
Kunming 650500, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 28, 2017; final manuscript received July 7, 2017; published online September 29, 2017. Assoc. Editor: Xiaolan Ai.

J. Tribol 140(2), 021402 (Sep 29, 2017) (10 pages) Paper No: TRIB-17-1161; doi: 10.1115/1.4037356 History: Received April 28, 2017; Revised July 07, 2017

Measuring and verification of contact force in a rolling element bearing is a big problem. In this study, a new measuring method for contact force in a large-scale ball bearing is developed. The idea is to measure the deformation under the ball–race contact by displacement sensor at first, and the displacement of the end face of load bearing ring is also measured to determine the contact angle of ball–race contact. Then, the corresponding theory is developed to calculate the contact angle of ball–race contact by the displacement of the end face of load bearing ring. At last, the ball–race contact force is determined by accurately calculating through finite element method (FEM). Results show that the relation between contact force and deformation of measuring surface which is under ball–race contact is linear. The position of ball greatly affects the contact angle of ball–race contact. The contact angle of the ball which is near the arm of force is larger than that of the ball which is far from the arm of force. On the contrary, the measuring deformation of ball–race contact that is near the arm of force is less than that of ball–race contact that is far from the arm of force. The method developed here is only suitable for large-scale rolling element bearing because of the size constraint of the sensor.

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Figures

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Fig. 1

Sketch of test rig

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Fig. 2

Physical map of test rig: (a) whole view and (b) hydraulic station

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Fig. 3

Physical dimensions of displacement sensor

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Fig. 4

Data-acquisition system: (a) PLC and extension unit and (b) digital display

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Fig. 5

Sectional view of displacement sensor installation: (a) sectional view and (b) slewing bearing

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Fig. 6

Influence of ball shift

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Fig. 7

Geometry of bearing section before and after loading

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Fig. 8

Flowchart for determination of contact force

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Fig. 9

Contact model: (a) solid model and (b) section view

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Fig. 10

Mesh of contact model: (a) whole view, (b) section view, and (c) partial view

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Fig. 11

Calibration of displacement sensor

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Fig. 12

Azimuth angle of slewing bearing and sensor position

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Fig. 13

Relative position between ball and mounting hole of sensor after assembling: (a) sensor 1 and (b) sensor 2

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Fig. 14

Influence of ball position on deformation of measuring surface

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Fig. 15

Measuring of Z-axis displacement of outer ring's upper surface

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Fig. 16

Von Mises stress of ball–race contact: (a) whole view and (b) partial view

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Fig. 17

Contact stress between ball and outer raceway

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Fig. 18

Effect of body of displacement sensor on FEA

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Fig. 19

Contact force and deformation of measuring surface

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