Patent ID: 7007611

Claim:
A self-steering three-axle bogie comprising: a first outer wheel set associated with a first outer wheel set bearing housing located on one side of the bogie; a second outer wheel set associated with a second outer wheel set bearing housing located on said one side of the bogie; a central wheel set located between the first and second outer wheel sets and associated with a central wheel set bearing housing located on said one side of the bogie; and a steering system for coupling the wheel set bearing housings in such a way that the first and second outer wheel set bearing housing are movable in a longitudinal direction of the bogie opposite to one another while the central wheel set bearing housing is movable in a transverse direction of the bogie, the steering system comprising: a first rotary lever connected to the central wheel set bearing housing, the first rotary lever comprising an angular lever comprising a first arm and a second arm and a fulcrum pin which is fixed to the frame; and a first steering linkage assembly for coupling the first rotary lever to the first outer wheel set bearing housing and a second steering linkage assembly for coupling the first rotary lever to the second outer wheel set bearing housing, the first steering linkage assembly comprising a first steering linkage, arranged at an angle in relation to the longitudinal direction, and provided between a first joint on the first rotary lever and a second joint on the first outer wheel set bearing housing; the first steering linkage assembly further comprising a third joint for connecting the rotary lever to a face of the central wheel set bearing housing, wherein the first joint is arranged on the first arm of the first rotary lever and the third joint is arranged on the second arm of the first rotary lever; the second steering linkage assembly further comprising: a second rotary lever pivotally connected to the frame via a second fulcrum pin, the second rotary lever comprising fourth and fifth joints arranged on opposite sides of the second fulcrum pin; a second steering linkage coupled to the fourth joint of the second rotary lever and to the second outer wheel set bearing housing; and a third steering linkage coupled to the fifth joint of the second rotary lever and to the first rotary lever, wherein the second fulcrum pin is centred between the fourth and fifth joints.