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Research on Reduction of Unusual Noise in Wet Multiple Disk Clutch for 4WD

Article of Honda R&D Technical Review Vol.15 No.2


When AT clutches are utilized in torque-on-demand 4WD systems, in which rear wheel traction is controlled by pushing force from a wet multiple disc clutch, unusual noise is generated in some cases during turning or takeoff by continuous input of difference in speed. The status of lubrication in a clutch unit in isolation was analyzed to find the cause, and results showed that the lubrication flow rate to the clutch was low, and that the lubricant was not being uniformly supplied to every section. A test vehicle was set up to reproduce the conditions of the unit analysis, and the unusual noise occurring in the unit was effectively reproduced. It was determined that the noise is related to the ratio of porosity and the amount of deflection in friction materials. These results enabled the specifications of the lubricant to be improved. In addition, friction materials with increased porosity and deflection were developed to improve the oil retention characteristic in the clutch. Vehicle tests were repeated employing these measures, and no unusual noise was generated.


(1) Society of Automotive Engineers of Japan, Inc.: Automatic transmission, Tribology in Automobile, Tokyo, Yokendo Ltd., p. 151-155 (1994)
(2) Kobayashi et al.: Development of Dual Pump 4WD System, HONDA R&D Technical Review, Vol. 8, p. 77-82 (1996)
(3) Hamada et al.: Weight Saving of 4WD Vehicles by Optimizing Distribution of Torque between Front and Rear Wheels, Journal of Society of Automotive Engineers of Japan, Inc., Vol. 46, p. 99-103 (1992)
(4) Hamada et al.: Realtime 4wd Dual Pump System, Automotive Engineering, Vol. 43, No. 7, p. 16-25 (1994)

Author (organization or company)

Masaki INOUE(Tochigi R&D Center)、Yasunori ARAI(Tochigi R&D Center)、Toshiaki AZEGAMI(Tochigi R&D Center)、Yasuo HIRAO(Tochigi R&D Center)

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