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Simulation of Stress on Elements of Metal Pushing V-belt for CVT under Transient Operating Conditions

Article of Honda R&D Technical Review Vol.19 No.2

Summary

The metal pushing V-belt of a torque converter-equipped CVT receives a sudden thrust load from the pulleys when the CVT starts operation, and is required to begin transmitting torque from a stationary state in a very short time span. In the research discussed in this paper, the stress history of the area around the element neck under the transient conditions of CVT start-up was studied using a technology enabling simultaneous simulation of the dynamic behavior of the metal pushing V-belt and stresses on the elements. The results of this study indicated that the load on the V surface of the element is the dominant factor in the generation of stress on the element necks, and that bending stress generated by the pushing force between the elements also acts on the element necks. To confirm the accuracy of the simulation, results were compared with the results of tests conducted to determine the load distribution on the element. The two sets of results demonstrated a good qualitative correlation. This paper also discusses the method employed to evaluate transient stress.

Reference

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(2) Katoh, Y., Yamashita, H., Kawano, Y.: A Study on the Torque Capacity of Belt CVTs for 2.0-liter and 3.5-liter Front-Drive Cars, JSAE Autumn Convention, No.65-03, p.1-4(2003)
(3) Kobayashi, D., Mabuchi, Y., Katoh, Y.: A Study on the Torque Capacity of a Metal Pushing V-Belt for CVTs, SAE Paper, 980822(1998)
(4) Pennings, B., Drogen, V. M., Hepp, M., Ginkel, V. E., Brandsma, A.: Van Doorne VDT Fluid Test: A Test Method on Belt-Pulley Level to Select Fluids for Push Belt CVT Applications, SAE Paper, 2003-01-3253(2003)
(5) Okada, T., Nozawa, H., Hattori, Y., Tani, H.: Stress Analysis of Metal V-belt Considering Pulley Rigidity, Proceedings of JSAE, No.47-06, p.15-18(2006)
(6) Shimizu, H., Kobayashi, D., Kawashima, J., Katoh, Y.: Development of 3-D Simulation for Analyzing the Dynamic Behavior of a Metal Pushing V-Belt for CVTs, JSAE Spring Convention, No.8-99, p.9-12(1999)
(7) Saito, T., Okano, T.: Application of Metal Pushing VBelt Stress Simulation with CVT pulley stiffness, Honda R&D Technical Review, Vol.14, No.1, p.191-196
(8) Saito, T., Miyamoto, K.: Application of Technique for Prediction of Stress in Elements of Metal Pushing Vbelt by Simulation of Dynamic Behavior, SAE Paper, 2006-01-1307(2006)
(9) Kanehara, S., Fujii, T.: A Study on Power Transmitting Mechanism of Metal Pushing V-Belt, HONDA R&D Technical Review, Vol.7, p.49–67
(10) Pennings, B., et al.: New Push-Belt Design to Increase Power Density of CVTs Featuring a New Maraging Steel, San Francisco, VDI-Verlag(2004)
(11) Yagasaki, T., Aoyama, H., Saito, T., Ishii, K., Okada, Y., Arikawa, M.: Development of Metal Pushing V-Belt for Continuously Variable Transmission, Honda R&D Technical Review, Vol.14, No.1, p.181-190
(12) Sluis, V. D., et al.: Stress reduction in push belt rings using residual stresses, Proceedings of CVT2002 Congress, VDI-Berichte 1709, Munich, p.383-402(2002)
(13) Yagasaki, T., Aoyama, H., Ohnuki, M., Okada, Y., Kataoka, R.: Development of Metal Pushing V-Belt for Continuously Variable Transmission for 2L Class Vehicle, Honda R&D Technical Review, Vol.16, No.2, p.95-102
(14) Yamashita, K., Naruse, T.: Technique for Prediction of Main Input Torque to Drive Train, MAE Technical Report, No.13(2004)
(15) Kanehara, S., Fujii, T., Kitagawa, T.: A Study of a Metal Pushing V-Belt Type CVT - Part 3: What Forces Act on Metal Blocks?-, SAE Paper, 940735(1994)

Author (organization or company)

Toshihiro SAITO(Automobile R&D Center)

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