Damping system for steering wheel

A damping system for steering wheel, comprising:

• a fixed member fixed to a steering shaft extending in a front-rear direction;
• an airbag device which comprises a back holder provided at a front portion thereof and which is disposed on a rear side of the fixed member;
• an elastic member mounted in a mounting hole formed in the back holder so as to penetrate therethrough in a front-to-rear direction;
• and
• a horn switch mechanism comprising:
• a support member supported on the fixed member at a position on a front side of the back holder;
• and
• a slider disposed between the support member and the elastic member so as to activate a horn unit by a forward movement of the slider associated with a pressing operation of the airbag device,
• wherein said damping system allows the airbag device to function as a damper mass of a dynamic damper, and allows the elastic member to function as a spring of the dynamic damper,
• wherein the horn switch mechanism further comprises an extended portion extending forwards,
• wherein the back holder comprises an engaged portion extending rearwards and formed at a circumferential edge portion of the mounting hole,
• wherein the elastic member comprises an engaging portion comprising a recess portion opened in a front surface of the elastic member,
• wherein the elastic member is sandwiched by the engaged portion fitted in the engaging portion and the extended portion in the front-rear direction, and
• wherein the elastic member is formed, as a whole, of an elastic materiel of rubber or elastomer.