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Research Papers: Applications

Research on the Mechanical Properties of a New “I” Type Double-Decker Ball Bearing

[+] Author and Article Information
Yili Zhu

College of Electronic Information and
Electrical Engineering,
Changzhou Institute of Technology,
Changzhou 213002, China
e-mail: nuaazyl@nuaa.edu.cn

Yongchun Zhang

School of Electrical and Information Engineering,
Jiangsu University,
Zhenjiang 212013, China
e-mail: zhangyc@czu.cn

Chaowu Jin

College of Mechanical and
Electrical Engineering,
Nanjing University of
Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: jinchaowu@nuaa.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 15, 2015; final manuscript received September 3, 2015; published online October 20, 2015. Assoc. Editor: Xiaolan Ai.

J. Tribol 138(2), 021102 (Oct 20, 2015) (9 pages) Paper No: TRIB-15-1080; doi: 10.1115/1.4031583 History: Received March 15, 2015; Revised September 03, 2015

The new “I” type double-decker ball bearing (NITDDBB) with two inner contact ball bearings is proposed to improve the speed and load capability of the original I type double-decker ball bearing (OITDDBB). Based on the quasi-statics principle, the mechanical model of the NITDDBB is established and takes into consideration the radial load, axial load, and ball centrifugal forces, as well as the gyroscopic moments. The corresponding calculation model is established on the matlab platform. The mechanical characteristics of the NITDDBB are analyzed and compared with the OITDDBB and also with a single-decker ball bearing (SDBB). Finally, a bearing load test rig is designed and built to verify the simulation results. The results provide a theoretical and experimental basis for the application of the NITDDBB.

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References

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Figures

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Fig. 1

Structure of DDBB: (a) ITDDBB and (b) ZTDDBB

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Fig. 2

Structure of NITDDBB

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Fig. 3

Ball position angles of DDBB

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Fig. 4

Positions of ball center and relative raceway curvature centers of the outer bearing before and after loading

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Fig. 5

Positions of ball center and relative raceway curvature centers of the left inner bearing before and after loading

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Fig. 6

Ball mechanical models of NITDDBB

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Fig. 7

Principle diagram of bearing loading test rig

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Fig. 8

Photo of bearing loading test rig

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Fig. 9

Experimental results of speed distribution ratio of DDBB at various work speeds

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Fig. 10

Influences of radial load on bearing mechanical characteristics: (a) radial displacement, (b) radial stiffness, and (c) axial displacement

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Fig. 11

Influences of axial load on bearing mechanical characteristics: (a) axial displacement, (b) axial stiffness, and (c) radial displacement

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Fig. 12

Influences of various work speeds on bearing deformations: (a) radial displacement and (b) axial displacement

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Fig. 13

Experimental results of outer race temperature increase at various work speeds

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