Steering mechanism

A steering mechanism for a wheel vehicle having at least one steered vehicle wheel, comprising:

• a steering shaft;
• a first wheel rotatably driven by said steering shaft;
• a second wheel pivoting and steering said steered vehicle wheel and having a center axis of rotation extending on the equatorial plane of said steered vehicle wheel;
• torque transmitting means passed between said first and second wheels to transmit a steering force from said first wheel to said second wheel when said first wheel is rotated by said steering shaft, said torque transmitting means having a travelling path having a meeting point at which said torque transmitting means is brought into tangential engagement with said second wheel and a parting point at which said torque transmitting means is brought out of engagement with said second wheel, said travelling path having a semi-circular turning portion at which said torque transmitting means is engaged with the circumferential section of said second wheel;
• characterized in that said second wheel is formed to have such a circumference that the length between the center axis of rotation of said second wheel and any one of said meeting and parting points of said travelling path of said torque transmitting means is smaller than the length between the center axis of rotation of said second wheel and an arbitrary point on the semi-circular circumferential section of said second wheel in the state that said steered vehicle wheel assumes a straight movement position.