Patent ID: 6343660
Filing Date: 2002-02-05
Classification: A01B

Abstract:
A steering gear for controlling an implement in a coupling between a tractor and said implement mounted in front of the tractor, comprising:a yoke structure for coupling to the tractor, a part which is steerable relative to the yoke structure, and at least two transmission structures between the steerable part and the yoke structure, said transmission structures, in a straight-on position, being spaced apart at least in a horizontal direction transverse to a processing direction and which define engagement positions for exerting forces having at least one component in the processing direction on the steerable part and are arranged for allowing lateral movement of the steerable part from a straight-on position to the left and to the right relative to the yoke structure, and, when the steerable part moves to the left, for urging the steerable part forwards relative to the yoke structure at the left one of said engagement positions, causing it to steer to the right, and, when the steerable part moves to the right, for urging the steerable part forwards relative to the yoke structure at the right one of said engagement positions, causing it to steer to the left, wherein the transmission structures are of such design that during a lateral movement of the steerable part within at least a specific path, wherein the steerable part at said one of said engagement positions moves forwards, any rearward movement of the steerable part at the other one of said engagement positions, relative to the yoke structure is limited to movement with a substantially constant ratio relative to the lateral movement and continuously by a distance less than the forward displacement at said one of the engagement positions, in the processing direction or against the processing direction.