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This paper describes the calculative verification of the effect of the right-and-left torque vectoring system in various types of drivetrain, namely, the front wheels only, the rear wheels only, and both front and rear wheels in FWD, RWD, and AWD vehicles. The effect is evaluated by calculating the vehicle dynamics limit; maximum acceleration and cornering ability. The right-and-left vectoring torque, which is needed for expanding the vehicle dynamics limit, is also calculated. And finally, the paper evaluates the suitable wheels for which the system should be applied in each drivetrain. The application to the front wheels is more effective for FWD vehicles. On the other hand, the application to the rear wheels is more effective for RWD and AWD vehicles.

A new method for analyzing idle shake is discussed. A primary design technique of engine mount systems and vehicle bodies in the early development stage is proposed. In general, specifications for the engine mount system, which is composed of several insulator rubbers, are determined by certain criteria of transmissibilities of engine excitation forces to the rigid foundation. However, when the transmitted forces are applied to a flexible body, the resultant response of the body depends not only on the transmissibilities of the isolation system, but on vibratory characteristics of the flexible body. Therefore, the body needs to be taken into account for antivibration design as well as the engine mount system. Besides, the engine mount and the body cannot be evaluated by simple criteria due to the several insulator rubbers which feature many transmissibilities and transfer functions.

Mitsubishi Motors Corporation uses spiral bevel gears in the transfer system for 4-wheel drive passenger cars modified from the front wheel drive configuration. This transfer gear ratio is near 1:1, and gears have uniform depth teeth cutting by the continuous generating method of OERLIKON cutting machine. In this method, the cutter and the work rotations are timed together to accomplish continuous indexing and cutting in order to enable high productivity. In general, it is difficult to reduce the meshing noise of spiral bevel gears and control its quality. The authors established the tooth surface coordinates, to reduce the meshing noise, by studying the influence of tooth surface coordinates on the meshing transmission error (MTE).

For safety, high performance, and easy to drive reasons, various types of four wheel drive (4WD) systems, which utilize a center differential or viscous coupling unit between the front and the rear axles, have been introduced into passenger cars in recent years. This paper describes the vehicle behaviour of various types of 4WD passenger cars under the condition of acceleration, deceleration, cornering, and braking, in addition to the vehicle response to disturbance from the road surface, by both theoretical and experimental approaches.