Research Papers: Applications

Vibration and Acoustic Emission Measurements Evaluating the Separation of the Balls and Raceways With Lubricating Film in a Linear Bearing Under Grease Lubrication

[+] Author and Article Information
Hiroyuki Ohta

e-mail: ohta@mech.nagaokaut.ac.jp

Yuko Nakajima

Department of Mechanical Engineering,
Nagaoka University of Technology,
1603-1 Kamitomioka, Nagaoka,
Niigata 940-2188, Japan

Soichiro Kato

LG Technology Department,
Linear Technology Center, NSK Ltd.,
12 Kirihara, Fujisawa,
Kanagawa 252-0811, Japan

Hideyuki Tajimi

Research Department,
Linear Technology Center, NSK Ltd.,
12 Kirihara, Fujisawa,
Kanagawa 252-0811, Japan

For a typical ground surface, the RMS roughness is approximately 1.3 times the arithmetic average roughness [9].

In this paper, AE is defined as the transient elastic waves generated by the interaction of two surfaces in relative motion [12].

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received July 14, 2012; final manuscript received June 21, 2013; published online August 6, 2013. Assoc. Editor: Mihai Arghir.

J. Tribol 135(4), 041104 (Aug 06, 2013) (8 pages) Paper No: TRIB-12-1113; doi: 10.1115/1.4024936 History: Received July 14, 2012; Revised June 21, 2013

This paper deals with vibration and acoustic emission (AE) measurements evaluating the separation of the balls and raceways with lubricating film in a linear-guideway–type recirculating ball bearing (linear bearing) under grease lubrication. In the experiments, three types of commercial grease, AS2, LG2, and PS2, were used. The vibratory acceleration, AE, temperature, and electric conductivity (contact voltage) in the test bearing were measured, while a carriage of the test bearing was driven at a certain linear velocity. Experimental results showed that the measured vibratory acceleration, AE, and contact voltage of the test bearing were affected by the linear velocity and the base oil viscosity of the grease. Next, the rail side film parameter ΛR and the carriage side film parameter ΛC were examined for the test bearing in operation, and it was shown that the ΛR value was lower than the ΛC value. In addition, a condition for the separation of all the balls and raceways with lubricating film was presented. Finally, it was shown that the measured root-mean-square (RMS) values of vibratory acceleration or AE can be used for evaluating the separation of all the balls and raceways with lubricating film in the test bearing.

Copyright © 2013 by ASME
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Fig. 2

Experimental apparatus

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Fig. 3

The electric circuit for contact voltage measurement

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Fig. 4

Time waveforms (V = 0.5 m/s)

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Fig. 5

Effects of linear velocity and base oil viscosity of grease on vibration, AE, and contact voltage

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Fig. 6

Threshold linear velocity

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Fig. 7

Vibration and AE spectra (V = 0.5 m/s)

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Fig. 8

Minimum base oil film thickness of grease

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Fig. 9

Relationships of vibration, AE, and film parameter




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