Coupling spindle, a steering system and vehicle

The utility model discloses a coupling spindle, a steering system and vehicle. A coupling spindle, is equipped with fork of first festival including axle body, an at least tip of axle body, and the axial that the tip relative with the prong was stuck to the first festival is equipped with first through -hole, and first through -hole is used for placing the tip of a body, has the external splines on the outer circumference of the tip of axle body, is equipped with the internal spline on the inner wall of first through -hole, internal spline and external splines clearance fit, wherein: be equipped with the breach in the bottom outside of the fork from hole inner wall extension to the first festival on the pore wall of first through -hole, the both sides of breach are equipped with the tightening liftinglug, are equipped with the bolt hole on the tightening liftinglug, are equipped with fixing bolt in the bolt hole, be equipped with a concave plane on the external splines, a concave planepushes with fixing bolt'