TRACTOR HITCH Russian patent published in 2013 - IPC A01B59/00 

FIELD: agriculture.

SUBSTANCE: hitch comprises a rear connecting frame, a four-bar mechanism transmitting the load from the tool to the tractor, power hydraulic cylinders and standard drive mechanism. The four-bar mechanism is formed by two lower thrusts and at least one upper thrust, which are secured by hinges with one ends on the connecting frame, and the other ends - on the tractor. The hydraulic cylinders are connected to the hydraulic system. The mechanism transmitting the load from the tool to the tractor is made as four-link chain of Chebyshev. In the four-link chain the instantaneous center of rotation lies at the intersection point of the horizontal line of location of the hinge axes of the lower thrust with the line passing through the hinge axes of the upper thrust. In the four-link chain the attachment hinge on the tractor of each upper thrust or each lower thrust is mounted with the ability to transpose vertically with the preset parameters via the intermediate lever fixed by one end on the tractor, which is connected to its hinge at the other end.

EFFECT: constructive implementation enables to simplify the hitch with an increase in its operational reliability, and to enhance the versatility of the hitch due to the ability of its use with different types of tractors.

6 cl, 3 dwg