Research Papers: Applications

Test Rig for Spline Couplings Working in Misaligned Conditions

[+] Author and Article Information
Vincenzo Cuffaro

e-mail: vincenzo.cuffaro@polito.it

Francesca Curà

e-mail: francesca.cura@polito.it

Andrea Mura

e-mail: andrea.mura@polito.it
Department of Mechanical and
Aerospace Engineering,
Politecnico di Torino,
C.so Duca degli Abruzzi 24,
Torino 10129, Italy

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received November 14, 2012; final manuscript received September 25, 2013; published online November 7, 2013. Assoc. Editor: Robert L. Jackson.

J. Tribol 136(1), 011104 (Nov 07, 2013) (7 pages) Paper No: TRIB-12-1203; doi: 10.1115/1.4025656 History: Received November 14, 2012; Revised September 25, 2013

This paper presents a novel spline couplings test rig. Its peculiarity is to allow angular misalignments between hub and shaft in order to investigate the behavior of spline couplings in real working conditions, in particular, to investigate fretting wear phenomena. A preliminary experimental activity has been carried out showing a correct behavior of the test rig from all points of view. A preliminary approximated estimation of the test articles fretting wear has been obtained by means of two experimental parameters: Ra roughness and the amount of angular rotation clearance. An estimation of the Ruiz parameter has also been obtained.

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Fig. 1

Spline coupling test rig

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Fig. 2

Scheme of spline coupling test rig

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Fig. 3

Spline coupling test article (before nitrogen-hardening)

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Fig. 4

Roughness measuring position

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Fig. 5

Measuring device used to obtain the angular rotation

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Fig. 6

Teeth surface after test 1

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Fig. 7

Teeth surface after test 2

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Fig. 8

Teeth surface after test 3

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Fig. 9

Teeth surface after test 4

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Fig. 10

Teeth roughness Ra before and after test 1 (misalignment 0′; with lubrication)

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Fig. 11

Teeth roughness Ra before and after test 2 (misalignment 5′; without lubrication)

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Fig. 12

Teeth roughness Ra before and after test 3 (misalignment 10′; with lubrication)

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Fig. 13

Teeth roughness Ra before and after test 4 (misalignment 10′; without lubrication)

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Fig. 14

Oil debris monitoring

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Fig. 15

Angular rotation measured after each test

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Fig. 17

Displacement of teeth surface nodes during rotation with angular misalignment

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Fig. 18

Displacement map for 10′ misalignment

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Fig. 19

Pressure distribution in axial direction in misaligned and nonmisaligned conditions

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Fig. 20

Ruiz parameter map

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Fig. 21

Ruiz parameter isocurves related to the teeth surface (test 2, tooth No. 1)




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