Abstract
Gear adaptive transmission represents itself as the gear variator with the variable transfer ratio. Unsuccessful attempts of creation of a gear variator were undertaken repeatedly. The main problem is - maintenance of constant gearing of cogwheels of a variator. The decision of this problem is based on use of science discovery in the kinematic chain with two degrees of freedom. The gear variator in the form of the closed differential mechanism has definability and allows changing the transfer ratio in the set range. Thus external variable technological loading changes the transfer ratio itself. The adaptive to variable loading gear variator works without the control mechanism. The gear variator opens essentially new concept of creation of adaptive techniques for machines with variable technological resistance (for example, adaptive gearboxes). The theory of a gear variator is based on a discovery «Effect of force adaptation in mechanics», published in leading editions of world press. According to this discovery the kinematic chain with two degrees of freedom, containing the mobile closed contour, becomes the definable mechanism at presence only one input link. Such mechanism gets property independently to change speed of motion of an output link depending on variable loading. The discovery is based on mechanics laws. In work the bases of the theory of a gear adaptive variator are stated.