Rotation induction device for vehicle

A rotation induction device for a vehicle, comprising:

• a first synthetic resin material member having a piston rod disposed therethrough;
• a second synthetic resin material member, disposed under the first synthetic resin material member, having the piston rod disposed therethrough;
• a third synthetic resin material member, disposed between the first and second synthetic resin material members such that the piston rod passes through the third synthetic resin material member, configured to induce either one or both of the first and second synthetic resin material members to rotate;
• a stress distribution part disposed on the third synthetic resin material member and comprising curved surfaces configured to distribute stress caused by a vertical load;
• and
• a lubricant storage part formed in the third synthetic resin material member, configured to store lubricant therein, and comprising an upper storage part on an upper surface of the third synthetic resin material member to store a portion of the lubricant therein and a lower storage part on a lower surface of the third synthetic resin material member to store another portion of the lubricant therein,
• wherein the upper and lower storage parts each comprise a circumferential groove along a concentric circle, and a radial groove in a radial shape and having a greater depth than the circumferential groove.