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In a torque transmission system, plural engagement pieces elastically deformable are formed integrally with an outer peripheral portion of a circular portion of a center hub to be engaged with an inner periphery portion of a pulley. A bridge portion of the center hub is disposed to be broken when a

In a torque transmission system, plural engagement pieces elastically deformable are formed integrally with an outer peripheral portion of a circular portion of a center hub to be engaged with an inner periphery portion of a pulley. A bridge portion of the center hub is disposed to be broken when a torque large than a predetermined torque is applied there to. Since the engagement protrusion pieces are engaged with a part of the pulley, it can prevent the center hub from being removed and falling when the bridge portion of the center hub is broken.

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1. A torque transmission system for transmitting torque from a driving unit to a driven unit, the system comprising:a first rotation member which is rotated by torque from the driving unit: a second rotation member connected to a rotation portion of the driven unit, to be rotated together with the r

1. A torque transmission system for transmitting torque from a driving unit to a driven unit, the system comprising:a first rotation member which is rotated by torque from the driving unit: a second rotation member connected to a rotation portion of the driven unit, to be rotated together with the rotation portion of the driven unit; a torque transmitting member transmitting torque from the first rotation member to the second rotation member, the torque transmitting member being disposed to be broken when the torque transmitted from the first rotation member is larger than a predetermined torque, wherein the torque transmitting member is connected to the first rotation member through an elastic member; and a prevention member disposed to prevent the torque transmitting member from being removed when the torque transmitting member is broken wherein tho prevention member is constructed to transmit force between the first rotation member and the torque transmitting member when the prevention member operates to prevent the torque transmitting member from being removed. 2. The torque transmission system according to claim 1, wherein:the rotation portion of the driven unit is a shaft connected to the second rotation member; the torque transmitting member is connected to the second rotation member, and is broken to interrupt a torque transmission when the torque transmitted from the first rotation member is larger than the predetermined torque; and the prevention member is provided in the torque transmitting member at a side of the first rotation member. 3. The torque transmission system according to claim 2, wherein:the torque transmitting member includes a circular portion having a plurality of protrusion portions to which torque supplied from the first rotation member is received, and a bridge portion through which the circular portion is mechanically connected to the second rotation member; and the prevention member is provided in the circular portion. 4. The torque transmission system according to claim 3, wherein the prevention member is provided in an outer periphery of the circular portion to be engaged with the first rotation member.5. The torque transmission system according to claim 3, wherein the prevention member is provided in an outer periphery of the circular portion at a position between two adjacent protrusion portions.6. The torque transmission system according to claim 3, wherein the prevention member is provided at a distal end of each protrusion portion of the circular portion to be engaged with the first rotation member.7. The torque transmission system according to claim 1, wherein:the torque transmitting member includes a cylindrical portion mechanically connected to the shaft, a circular portion having a plurality of protrusion portions to which torque supplied from the first rotation member is received, and a bridge portion through which the circular portion is mechanically connected to the cylindrical portion; and the prevention member is provided in the circular portion to be integrated with the circular portion. 8. The torque transmission system according to claim 7, wherein the prevention member is provided in an outer periphery of the circular portion.9. The torque transmission system according to claim 7, wherein the prevention member is provided in an outer periphery of the circular portion at a position between adjacent two protrusion portions.10. The torque transmission system according to claim 7, wherein the prevention member is provided at a distal end of each protrusion portion of the circular portion.11. The torque transmission system according to claim 7, wherein the prevention member is at least an engagement protrusion piece elastically deformable to engage with a part of the first rotation member.12. A torque transmission system for transmitting torque from a driving unit to a driven unit, the system comprising:a rotation member which is rotated by torque from the driving unit; a torque transmitting member connected to a shaft of the driven unit, for transmitting torque from the rotation member to the shaft, the torque transmitting member being disposed to be broken when the torque transmitted from the rotation member is larger than a predetermined torque; and a prevention member disposed to prevent the torque transmitting member from being removed when the torque transmitting member is broken, wherein: the rotation member includes a rim member having an approximate ring shape for receiving torque, a bearing portion disposed inside the rim member, and a connection portion connecting the bearing portion and the rim member, the torque transmitting member includes a cylindrical portion mechanically connected to the shaft, a circular portion having a plurality of protrusion portions to which the torque supplied from the rotation member is received, and a bridge portion through which the circular portion is mechanically connected to the cylindrical portion; and the prevention member is a stopper member having an approximate ring shape, and is attached to the rim member to contact the circular portion. 13. The torque transmission system according to claim 12, wherein the stopper member is elastically deformable to press-contact an outer periphery of the circular portion.14. A torque transmission system for transmitting torque from a driving unit to a driven unit, the system comprising:a first rotation member which is rotated by torque from the driving unit: a second rotation member connected to a rotation portion of the driven unit, to be rotated together with the rotation portion of the driven unit; a torque transmitting member transmitting torque from the first rotation member to the second rotation member, the torque transmitting member being disposed to be broken when the torque transmitted from the first rotation member is larger than a predetermined torque, wherein the torque transmitting member is connected to the first rotation member through an elastic member; and a prevention member disposed to prevent the torque transmitting member from being removed when the torque transmitting member is broken, wherein the prevention member is connected directly to one of the torque transmitting member and the first rotation member to transmit force between the first rotation member and the torque transmitting member when the prevention member operates to prevent the torque transmitting member from being removed. 15. A torque transmission system for transmitting torque from a driving unit to a driven unit, the system comprising:a first rotation member which is rotated by torque from the driving unit; a second rotation member connected to a rotation portion of the driven unit to be rotated together with the rotation portion of the driven unit; a torque transmitting member transmitting torque from the first rotation member to the second rotation member, the torque transmitting member being disposed to be broken when the torque transmitted from the first rotation member is larger than a predetermined torque, wherein the torque transmitting member is connected to the first rotation member through an elastic member; and a prevention member disposed to prevent the torque transmitting member from being removed when the torque transmitting member is broken, wherein the prevention member engages the torque transmitting member when blocking removal of the torque transmitting member and is disengaged from the torque transmitting member during the torque transmission. 16. A torque transmission system for transmitting torque from a driving unit to a driven unit, the system comprising:a first rotation member which is rotated by torque from the driving unit; a second rotation member connected to a rotation portion of the driven unit, to be rotated together with the rotation portion of the driven unit; a torque transmitting member transmitting torque from the first rotation member to the second rotation member, the torque transmitting member being, disposed to be broken when the torque transmitted from the first rotation member is larger than a predetermined torque; and a prevention member disposed to prevent the torque transmitting member from being removed when the torque transmitting member is broken, wherein: the first rotation member includes a rim member having an approximate ring shape, a bearing portion disposed inside the rim member, and a connection portion connecting the bearing portion and the rim member; and the prevention member is a stopper member having an approximate ring shape, and is attached to the rim member, wherein: the torque transmitting member includes a circular portion having a plurality of protrusion portions to which torque supplied from the first rotation member is received, and a bridge portion through which the circular portion is mechanically connected to the second rotation member; and the prevention member is attached to the rim member to contact the circular portion.