Patent ID: 6488298
Filing Date: 2002-12-03
Classification: B60G

Abstract:
A wheel suspension apparatus comprising:a trailer having a front driving axle and a rear driving axle; an axle-bearing arm extending a direction toward one end of said trailer; a driving organ connected to one of said driving axles, said driving organ having a vertical axis of pivoting; a bearing structure positioned against said driving organ; a cover plate connected at one end to said bearing structure, said axle-bearing area having one end pivotally mounted to an opposite end of said cover plate; a shock absorbing means connected to an opposite end of said axle-bearing area, said shock absorbing means comprising: a helical spring; a first spring receiving part; a second spring receiving part fitted upon said first spring receiving part and helical spring positioned interior of said receiving parts and acting only in compression therein, and receiving parts slidable with respect to each other along an axis aligned with a central axis of said helical spring, said helical spring bearing against said receiving parts during the slideable movement thereof; a first spindle pivotally mounted to said first spring receiving part, a second spindle pivotally mounted to said second spring receiving part, said first and second spindles being parallel to said one of said driving axles, said first spring receiving part connected to said axle-bearing arm, said spring receiving part pivotally connected to said bearing structure, said one of said driving axles mounted on said axle-bearing arm so as to be substantially located on said vertical axis of pivoting of said driving organ.