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Research in Technology for Simulating Dynamic Behavior of Cam Drive Mechanism in Single-Cylinder Engines

Article of Honda R&D Technical Review Vol.22 No.1

Summary

A technology has been established for theoretical evaluation of timing chain systems, including drive loss and slapping noise at idling engine speed, in single-cylinder engines. To date, almost no theoretical evaluation reports have been published about drive loss and slapping noise in cam drive systems including timing chains. The specifications for tensioner lifters and tensioner guides that satisfy slapping noise and friction loss requirements have therefore been determined only through tests with actual engines. The highly accurate mechanism simulation model developed in this research is populated with data obtained through bench tests with actual engines. This includes the static and dynamic characteristics of the cam chain and tensioner guide as well as the cam sprocket and cam chain contact stiffness and friction coefficient. The results have confirmed a high correlation at the absolute value level between the simulation values and the actual engine test values for the load generated when cam chain slapping noise occurs as well as drive loss in the cam chain system. This research enables examination at the initial design stage of cam chain systems intended to achieve a high-level balance of enhanced fuel efficiency and low noise in engine performance.

Reference

(1) Takagishi, H., Nagakubo, A.: Multi-body Dynamic Chain System Simulation Using a Blade Tensioner, SAE Paper, 2006-32-0067 (2006)
(2) Kobayashi, T., Take, K., Kamiya, M., Takahashi, Y.: Piston Slap-noise Prediction Using 3-dimensional Piston Secondary Motion Simulation, Honda R&D Technical Review, Vol. 19, No. 1, p. 163-169

Author (organization or company)

Keiichi DAN(Motorcycle R&D Center)、Tadashi NIINO(Motorcycle R&D Center)、Mitsuyoshi KAMIYA(Motorcycle R&D Center)、Takuro KAWAKAMI(Motorcycle R&D Center)、Makiko SUGANO(Motorcycle R&D Center)、Takayuki KONUMA(Motorcycle R&D Center)

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