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The torque limiter includes a flywheel, a clutch plate, a spline hub, a clutch disc assembly and a transmission torque limiting part. The flywheel includes a friction coupling surface. The clutch plate includes plural axial through holes. Plural friction members are respectively attached to the thro

The torque limiter includes a flywheel, a clutch plate, a spline hub, a clutch disc assembly and a transmission torque limiting part. The flywheel includes a friction coupling surface. The clutch plate includes plural axial through holes. Plural friction members are respectively attached to the through holes. The spline hub can be engaged with a transmission-side shaft. The clutch disc assembly circumferentially elastically couples the clutch plate and the spline hub. The transmission torque limiting part limits torque to be transmitted from the flywheel to the transmission-side shaft while the friction members are interposed and held between the transmission torque limiting part and the friction coupling surface of the flywheel.

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1. A torque limiter configured to limit a torque to be transmitted from an engine-side member to a transmission-side shaft, comprising: a drive member coupled to the engine-side member, the drive member including a friction coupling surface;an input-side plate including a radial outer portion config

1. A torque limiter configured to limit a torque to be transmitted from an engine-side member to a transmission-side shaft, comprising: a drive member coupled to the engine-side member, the drive member including a friction coupling surface;an input-side plate including a radial outer portion configured adjacent to the friction coupling surface, the radial outer portion axially having a first thickness, the radial outer portion including first and second holes axially penetrating therethrough,first and second friction members configured in the first and second holes respectively, each of the first and second friction members having a second thickness greater than the first thickness; anda window hole configured in a radial inner portion of the radial outer portion;an output-side member configured to be engaged with the transmission-side shaft;a damper mechanism circumferentially elastically coupling the input-side plate and the output-side member; anda transmission torque limiting part configured to limit a torque to be transmitted from the drive member to the transmission-side shaft, with the first and second friction members being interposed and held between the transmission torque limiting part and the friction coupling surface of the drive member,the transmission torque limiting part including a pressure ring pressing the first and second friction members onto the friction coupling surface of the drive member,either the pressure ring or the friction coupling surface of the drive member including a protrusion protruding closer to one of faces of the input-side plate,the protrusion being disposed radial inwards of the first and second friction members. 2. The torque limiter recited in claim 1, wherein the radial outer portion includes a third hole axially penetrating therethrough,the input-side plate includes a third friction member configured in the third hole, where the third friction member has the second thickness,a distance between the first and second holes is equal to a distance between the second and third holes. 3. The torque limiter recited in claim 2, wherein each of the first, second, and third friction members is press-fitted in the first, second, and third holes without producing a circumferential clearance therein. 4. The torque limiter recited in claim 1, wherein the transmission torque limiting part includesa pressure ring holding the first and second friction members with the friction coupling surface of the drive member, with the first and second friction members being interposed therebetween;a ring-shaped cone spring including a radial inner portion configured to press the pressure ring towards the drive member, anda support member attached to the drive member to support a radial outer portion of the cone spring. 5. A torque limiter configured to limit a torque to be transmitted from a crankshaft of an engine to a transmission-side shaft, the torque limiter comprising: a disc-shaped drive member including a friction coupling surface, the disc-shaped drive member allowed to be coupled to an end of the crankshaft, the disc-shaped drive member including first and second attachment holes circumferentially aligned on a radial inner portion thereof, the attachment holes allowing first and second fasteners for fixation to be inserted the first and second attachment holes;an input-side member including a friction member on a radial outer portion thereof;an output-side member including an engaging portion be engaged with the transmission-side shaft;a damper mechanism circumferentially elastically coupling the input-side member and the output-side member; anda transmission torque limiting part configured to limit a torque to be transmitted from the drive member to the transmission-side shaft, with the friction member of the input-side member being interposed and held between the transmission torque limiting part and the friction coupling surface of the drive member,the input-side member and the damper mechanism being disposed radial outwards of a pitch circle diameter of the first and second attachment holes of the drive member,no other member excluding the output-side member being disposed radial inwards of the pitch circle diameter,the engaging portion of the output-side member having an axis misalignment of less than or equal to 1.0 mm with respect to a positioning portion which regulates a location of the drive member. 6. The torque limiter recited in claim 5, wherein the drive member includes the positioning portion for executing radial positioning thereof with respect to the crankshaft. 7. The torque limiter recited in claim 5, further comprising the first and second fasteners are inserted into the first and second attachment holes respectively. 8. The torque limiter recited in claim 7, wherein the output-side member includes a boss having a spline joint portion in a center part thereof, and a flange extending radial outwards from the boss,the flange includes a tool inserting hole allowing a tightening tool to be inserted therein for fixing the first and second fasteners for fixation respectively inserted into the first and second attachment holes of the drive member to the crankshaft by the tightening tool. 9. A torque limiter configured to limit a torque to be transmitted from a crankshaft of an engine to a transmission-side shaft, the torque limiter comprising: a disc-shaped drive member including a friction coupling surface on a radial outer portion thereof, the disc-shaped drive member configured to be coupled to an end of the crankshaft;a disc-shaped input-side member including a friction member on a radial outer portion thereof;an output-side member including an engaging portion configured to be engaged with the transmission-side shaft;a damper mechanism circumferentially elastically coupling the input-side member and the output-side member; anda transmission torque limiting part configured to limit a torque to be transmitted from the drive member to the transmission-side shaft, with the friction member of the input-side member being interposed and held between the transmission torque limiting part and the friction coupling surface of the drive member,the drive member including an axially extended abutment portion on the radial outer portion thereof for radial positioning thereof, andan outer peripheral edge of the input-side member being abutted to the abutment portion of the drive member for radial positioning of the input-side member, the output-side member, and the damper mechanism,the drive member including first and second attachment holes circumferentially aligned on a radial inner portion thereof, the first and second attachment holes allowing first and second fasteners for fixation to be inserted respectively,the input-side member and the damper mechanism being disposed radial outwards of a pitch circle diameter of each of the first and second attachment holes of the drive member,no other member excluding the output-side member being disposed radial inwards of the pitch circle diameter,the engaging portion of the output-side member having an axis misalignment of less than or equal to 1.0 mm with respect to a positioning portion which regulates a location of the drive member. 10. The torque limiter recited in claim 9, wherein the drive member includes a tubular inner peripheral surface axially extending, andthe abutment portion for the radial positioning is formed on the tubular inner peripheral surface. 11. The torque limiter recited in claim 10, wherein the tubular inner peripheral surface includes a first engaging portion on an axial transmission side of the abutment portion,the transmission toque limiting part includes a pressure ring holding the friction member with the friction coupling surface of the drive member, with the friction member being interposed therebetween;a ring-shaped cone spring including a radial inner portion pressing the pressure ring towards the drive member, anda support member attached to the drive member for supporting a radial outer portion of the cone spring; andthe pressure ring including a second engaging portion on a radial outer portion thereof, the second engaging portion being engaged with the first engaging portion to prevent the pressure ring from rotating relative to the drive member. 12. A torque limiter configured to limit a torque to be transmitted from an engine-side member to a transmission-side shaft, the torque limitter comprising: a drive member coupled to the engine-side member, the drive member including a friction coupling surface;a friction coupling plate including a plate body having a hole axially penetrating therethrough, the plate body having a first thickness in an axial direction, anda friction member attached to the hole of the friction coupling plate, the friction member having a second thickness greater than the first thickness;an output-side member configured to be engaged with the transmission-side shaft;a damper mechanism circumferentially elastically coupling the friction coupling plate and the output-side member; anda transmission torque limiting part configured to limit a torque to be transmitted from the drive member to the transmission-side shaft, with the friction member being interposed and held between the transmission torque limiting part and the friction coupling surface of the drive member,the transmission torque limiting part including a pressure ring pressing the friction member onto the friction coupling surface of the drive member,either the pressure ring or the friction coupling surface of the drive member including a protrusion protruding closer to a face of the friction coupling plate, the protrusion disposed radial inwards of the friction member.