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Mechanism of Torque Capacity Change during Operation of AT with Focus on Friction Properties

Article of Honda R&D Technical Review Vol.21 No.1

Summary

The project discussed in this paper focused on the frictional characteristics of clutch facing materials in order to elucidate the mechanism by which the torque capacity of the multiple-plate clutches used in automatic transmissions (ATs) varies with their mode of use. The frictional characteristics of the facing materials are affected by the temperature, contact pressure, and sliding velocity of the friction surfaces. The temperature of the clutch plate, sliding velocity of the friction surfaces, and degree of misalignment of the gears transmitting torque were therefore measured in an AT during torque transmission. Next, a dynamic behavior analysis model, able to simulate the flow of torque transmission in the AT, was constructed on the basis of these measurement results. The results showed that the torque capacity of an AT operating at a constant temperature is affected by radial components of the friction force vectors on the friction surfaces.

Reference

(1) Kato, Y., Shibayama, N.: Mechanism of Automatic Transmissions and Their Requirements for Wet Clutches and Wet Brakes, Tribologist, Vol. 39, No. 12, p. 6-11 (1994)
(2) Uchida, Y., Miyamoto, O., Otani, T., Maruyama, T., Sakai, K., Tanimoto, S.: Development of New Compact 4-speed Automatic Transmission for Honda LIFE, Honda R&D Technical Review, Vol. 16, No. 2, p. 79-86
(3) Tripathi, K., Agrawal, M.D.: Design Optimization of Friction Clutch, Journal of The Institution of Engineers (India), Vol. 88, Part ME Mechanical, p. 29-33 (2007)
(4) Saito, T., Kotegawa, T., Matsuura, Y., Tanaka, S., Ohtsuki, K.: Study of Durability Prediction Considering Wear Properties for Multiple Plate Clutches, Honda R&D Technical Review, Vol. 18, No. 2, p. 155-162
(5) Hirayanagi, T.: Behavior of Lubricating Oil and Friction Characteristics for a Paper-Based Friction Material, NSK-WARNER Technical Review, No. 1, p. 3-10 (1995)

Author (organization or company)

Toshihiro SAITO(Automobile R&D Center)、Takaki YAMAOKA(Automobile R&D Center)、Masanori KATO(Automobile R&D Center)、Takashi MINAMINAKAMICHI(Automobile R&D Center)、Takashi HOSHI(Automobile R&D Center)、Koji MIYAMOTO(ITO CORP.)

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