PIVOT AND LEVER FOUR LINK MECHANISM OF HITCH FOR JOINING OF AGRICULTURAL TOOLS AND MACHINES WITH FRAME OF TRACTOR TO BE AGGREGATED Russian patent published in 2005 - IPC

FIELD: agricultural engineering, in particular, hitch systems for agricultural tractors.

SUBSTANCE: hitch mechanism has upper and lower shafts spaced from one another in transverse-vertical plane and connected with one another through right-hand and left-hand tines. Hitch mechanism is equipped with power hydraulic cylinder having base and stem. Base of hydraulic cylinder is disposed on lower shaft. Hydraulic cylinder stem lever is mounted on upper shaft. Hitch mechanism has hollow shaft with left-hand and right-hand lifting levers mounted on upper shaft and kinematically connected with hydraulic cylinder stem lever, central upper tie-rod with fork, and shock-absorber made in the form of spring, adjusting threaded coupling, head and finger, left-hand and right-hand lower longitudinal tie-rods equipped with mechanisms for changing length thereof. Left-hand and right-hand lower longitudinal tie-rods are connected through forks with left-hand and right-hand struts. Lower longitudinal tie-rods are joined thorough central head to lower shaft for movement thereon. Free ends of lower longitudinal tie-rods are provided with spherical pivot joints. Lateral motion of left-hand and right-hand lower longitudinal tie-rods is fixed by means of left-hand and right-hand restricting chains with couplings. Each mechanism for changing length of longitudinal tie-rod is made in the form of telescopic parts of tie-rod. Tie-rod parts are mutually connected with hydraulic drive for retracting of hydraulic drive stem toward lower shaft in transport position and for suppressing by means of hydraulic drive of high-frequency impact loads during process.

EFFECT: wider operational capabilities, enhanced reliability in operation and reduced action of dynamic loads upon tractor drive part and agricultural machine joined by means of hitching mechanism.

4 dwg