Abstract: In a four wheel drive power transmission system for a vehicle, a power distribution device receives rotational power from an engine and provides rotational power to the combination of the front wheels and also to the combination of the rear wheels, and is controllable either to provide differential action between the front wheels combination and the rear wheels combination, or for this differential action to be at least partially inhibited by torque transmission. This slippage control device includes: a subsystem which estimates the torque being input to the power distribution device for four wheel drive from the transmission mechanism; and a subsystem which provides differential action inhibition of the power distribution device according to the thus estimated value of the torque being input to it from the transmission mechanism. The method of operation of this device is also described.

Abstract: A lever mechanism for a cable linkage includes a control lever mounted on a rotary shaft for rotation therewith, a base plate mounted on the rotary shaft and fixed to the control lever for rotation therewith, and a lever plate adjustably assembled with the base plate and connected at one side of its outer peripheral portion to one end of the cable linkage, the lever plate being provided at its outer peripheral portion with a semicircular guide surface the center of which is located substantially at a rotation fulcrum of the lever plate. The cable linkage is supported on the semicircular guide surface of the lever plate, and the lever plate is displaceable on the base plate during the assembly process thereof to adjust the distance between the semicircular guide surface and the rotation fulcrum.