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Development of Light Weight and Lower Cost Aluminum VTEC Rocker Arm

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


A VTEC rocker arm has been produced from aluminum die-cast materials to reduce weight and lower cost. The new arm, like the majority of rocker arms in use, employs a roller follower to reduce drive friction loss in the valve system. The VTEC connecting holes, in which strength must be guaranteed, were focused on to enable the shift to aluminum in the new VTEC mechanism. A coaxial roller structure with a hollow roller bearing shaft was adopted, allowing the roller shaft to be press-fit into place and ensuring sufficient strength and accuracy in the new rocker arm. As a result, both the weight and the cost of the new rocker arm have been reduced by more than 20% against the former forged steel arm. The new arm was then first mass-produced for use in the Fit.


(1) Miura, et al.: Development of High-Efficiency Gasoline Engine With Variable Valve Lift and Timing System, Journal of Society of Automotive Engineers of Japan, Vol. 45, No. 8, p. 93 (1991)
(2) Inoue, et al.: Efficient engine with a new variable-valve-timing and -lift mechanism, Part 1 Development of variable valving system, JSAE Annual Congress Proceedings (891004)

Author (organization or company)

Chikara TANAKA(Tochigi R&D Center)、Noriyuki YAMADA(Tochigi R&D Center)

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