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Technical Brief

Carriage Drift in Linear-Guideway Type Roller Bearings

[+] Author and Article Information
Hiroyuki Ohta

Department of Mechanical Engineering,
Nagaoka University of Technology,
1603-1 Kamitomioka,
Nagaoka, Niigata 940-2188, Japan
e-mail: ohta@mech.nagaokaut.ac.jp

Taiki Kato

Department of Mechanical Engineering,
Graduate School,
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

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 12, 2014; final manuscript received January 14, 2015; published online February 11, 2015. Assoc. Editor: Mihai Arghir.

J. Tribol 137(2), 024505 (Apr 01, 2015) (7 pages) Paper No: TRIB-14-1079; doi: 10.1115/1.4029641 History: Received April 12, 2014; Revised January 14, 2015; Online February 11, 2015

This study deals with carriage drift (which is the differences of the carriage displacements or angular displacements at a certain position on a rail during a forward and return process) in linear-guideway type roller bearings. First, the displacements and angular displacements of the carriage of the “nonrecirculating” linear roller and ball bearings under a reciprocating operation were measured. The experimental results showed that carriage drift (in the horizontal, vertical, yaw, and pitch directions) occurred in the roller bearing and not in the ball bearing. Next, in relationship to roller skew, the generating mechanism of carriage drift in roller bearings was examined by a multibody analysis (MBA), then the generating mechanism of carriage drift was explained. Finally, to reduce carriage drift by restricting the roller skew, an antiskewing brace (ASB) was developed.

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References

Figures

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Fig. 1

Test bearings: (a) roller bearing and (b) ball bearing

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Fig. 2

Reference positions of carriage, cages, and rolling elements (roller bearing)

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Fig. 4

Coordinates for a test bearing

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Fig. 9

Calculated skew angle (γ11(0) = 1 deg, i = 1)

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Fig. 8

Calculated magnitude of carriage drift (γ11(0) = 1 deg)

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Fig. 7

Relationship between roller arrangement, roller skew, and forces

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Fig. 5

Measured magnitude of carriage drift: (a) roller bearing and (b) ball bearing

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Fig. 10

Calculated magnitude of Fij (γ11(0) = 1 deg)

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Fig. 11

Calculated angle βij (γ11(0) = 1 deg, i = 1)

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Fig. 12

Roller bearing with ASB

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Fig. 13

Measured magnitude of carriage drift in the roller bearing with ASB: (a) ca = 20 μm and (b) ca = 80 μm

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