The mechanics of cords is analyzed under simple bending to understand the fatigue failure mechanism of synchronous belts. A simplified beam model of synchronous belt bending is then proposed to calculate the amount of curvature under conditions of torque transmission. Especially the effect of friction force at the working flank is taken into account to explain the difference of damage accumulation between the driving-entry and driven-exit partial meshings. Finally, fatigue life prediction is carried out based on the calculated curvature under driving-contact and driven-contact fatigue failure conditions.
Issue Section:
Research Papers
Topics:
Fatigue damage,
Timing belts,
Fatigue failure,
Cordage,
Damage,
Fatigue life,
Friction,
Torque
1.
Amijima
S.
Fujii
T.
Kitabayashi
M.
1989
, “Study on the Fatigue Behavior of Toothed Belts
,” Journal of the Japan, Society of Mechanical Engineering
(in Japanese), Vol. 55
, pp. 1477
–1487
.2.
Childs, T. H. C., Coutsoucos, A., Dalgarno, K. W., Day, A. J., and Parker, I. K., 1991, “Life Prediction of Automotive Timing Belts,” Proceedings of JSME International Conference on Motion and Powertransmissions, Japan Society of Mechanical Engineerings, pp. 376–381.
3.
Childs
T. H. C.
Dalgarno
K. W.
Hojjati
M. H.
Tutt
M. J.
Day
A. J.
1997
, “The Meshing of Timing Belt Teeth in Pulley Grooves
,” Proceedings of Instn. Mech. Engrs., Part D
, Vol. 211
, pp. 205
–218
.4.
Costello, G. A., 1990, Theory of Wire Rope, Springer-Verlag, New York, p. 72.
5.
Dalgarno
K. W.
Day
A. J.
Childs
T. H. C.
1994
, “Synchronous Belt Materials and Belt Life Correlation
,” IMechE Journal of Automobile Engineering
, Vol. 208
, pp. 37
–48
.6.
Fukumori, K., 1992, “Failure in Rubber Composite Materials,” Journal of the Society of Rubber Industry, Japan (in Japanese), 65, pp. 445–456.
7.
Gerbert, G., 1975, “Stretching and Bending of a Cord,” Technical report from Gates Rubber Co., Denver Co, USA, p. 32.
8.
Gerbert
G.
Jo¨nsson
H.
Persson
U.
Stensson
G.
1978
, “Load Distribution in Timing Belts
,” ASME JOURNAL OF MECHANICAL DESIGN
, Vol. 100
, pp. 208
–215
.9.
Hearle, J. W. S., 1969, Structural Mechanics of Fibers, Yarns and Fabrics, John Wiley and Sons, New York.
10.
Iizuka
H.
Watanabe
K.
Mashimo
S.
1994
a, “Observation of Fatigue Failure in Synchronous Belts
,” Fatigue Fract. Engng. Mater. Struct.
, Vol. 17
, pp. 783
–790
.11.
Iizuka
H.
Tsutsumi
S.
Watanabe
K.
Mashimo
S.
1994
b, “Mechanism of Teeth Shearing in Synchronous Belts
,” Journal of the Society of Rubber Industry
, Japan (in Japanese), Vol. 67
, pp. 714
–720
.12.
Iizuka
H.
Tsutsumi
S.
Watanabe
K.
Mashimo
S.
Ohsako
N.
1995
a, “Cord Failure in Synchronous Belts
,” Journal of the Society of Rubber Industry
, Japan (in Japanese), Vol. 68
, pp. 559
–566
.13.
Iizuka, H., Tsutsumi, S., Watanabe, K., Mashimo, S., and Ohsako, T., 1995b, “Fatigue Failure of Synchronous Belts,” Proceedings of the International Rubber Conference, The Society of Rubber Industry, Japan, pp. 160–164.
14.
Iizuka, H., and Gerbert, G., 1996, “Fatigue Failure Mechanism of Synchronous Belts,” Proceedings of 7th International Power Transmission and Gearing Conference, ASME, San Diego.
15.
Koyama
T.
Kagotani
M.
Shibata
T.
Sato
S.
Hoshiro
T.
1978
, “Study on Strength of Synchronous Belts
,” Journal of the Japan.
Society of Mechanical Engineering (in Japanese), Vol. 44
, pp. 3923
–3931
.16.
Parker, I. K., 1991, “Synchronous Belt Mechanics and Life Prediction,” Doctoral thesis in University of Bradford, U.K., p. 36.
This content is only available via PDF.
Copyright © 1999
by The American Society of Mechanical Engineers
You do not currently have access to this content.
