Patent ID: 7311167

Claim:
A three-wheel swingable vehicle comprising: wheels driven through drive shafts; a pair of constant velocity joints operatively connected to each of said drive shafts; a ball spline mechanism provided between said constant velocity joints for enabling the distance between said constant velocity joints to be contracted and extended; and said ball spline mechanism includes a spline shaft having an outer circumferential surface provided with a plurality of shaft-side spline grooves extending in the axial direction, an outer tube surrounding the periphery of said spline shaft and having an inner circumferential surface provided with a plurality of tube-side spline grooves extending in the axial direction and a plurality of balls capable of rolling while being fitted in said shaft-side spline grooves and said tube-side spline grooves, wherein said drive shafts are mounted to a swingable three-wheel vehicle in which a vehicle body frame is swung in a left-right direction relative to a double wishbone type suspension for supporting rear wheels as said wheels.