ROTARY DAMPER AND TRANSMISSION MECHANISM PROVIDED WITH ROTARY DAMPER

PURPOSE: To prevent shock or uncomfortable feeling from being applied to the hand of a driver caused by the difference of the resistance of a shift lever by rotatably fitting a plurality of free rotors into respective annular grooves of a case, housing the rotors and viscous fluid, and covering them with seal assembly. CONSTITUTION: Since a sleeve 13 is moved and the load is eliminated when a shift lever is moved to the second gear speed from the neutral state, a sleeve spline 20 and a gear spline 21 is engaged with each other with great force. At this time, the protrusion 25B of a rotor 25 collides with the tips of the free rotors 27, 28, so as to move the free rotors 27, 28. The resistance of viscous fluid 2, to be generated by the speed difference between the outer peripheral surface of the rotor 25 and the inner peripheral surface of the free rotor 27 and the large resistance of the viscous fluid 2, to be generated by the speed difference between the outer peripheral surface of the free rotor 27 and the inner peripheral surface of the groove 26A are simultaneously generated. Accordingly, the sleeve spline 20 and the gear spline 21 are slowly engaged with each other, the gear of the transmission mechanism can be protected, and shock and uncomfortable feeling to the hand of a driver through the shift lever are eliminated.