PROBLEM TO BE SOLVED: To provide a power transmission device, in which deterioration of a power transmission shaft is suppressed.SOLUTION: The power transmission device includes: an input side rotator (clutch 50) having a cylindrical part 51 fixed to the power transmission shaft 15 and rotated together with the power transmission shaft 15 and an input side clutch pawl 53 provided at one end side of the cylindrical part 51 and an output side rotator (sprocket 60) to which the cylindrical part 51 is fitted for allowing the cylindrical part 51 of the input side rotating body to freely rotate as a rotating shaft and provided with an output side clutch pawl 63 that can be meshed with the input side clutch pawl 53 a plate 80 that can be fixed to the other end side of the cylindrical part 51 and a biasing member (torsional coil spring 70) locked to the output side rotator and the plate 80 and biasing the output side rotator in the rotating direction. The input side rotator and the output side rotator can relatively rotate within a predetermined angle range, and the fixing position of the plate 80 with respect to the cylindrical part 51 is changeable in the rotation direction.COPYRIGHT: (C)2013,JPO&INPIT【課題】動力伝達軸の劣化を抑制する動力伝達装置を提供すること。【解決手段】動力伝達軸15に対して固定され動力伝達軸15とともに回転する円筒状部51及び円筒状部51の一端側に設けられる入力側クラッチ爪53を備えた入力側回転体(クラッチ50)と、入力側回転体の円筒状部51を回転軸として回転自在となるように円筒状部51が挿嵌され、入力側クラッチ爪53に噛合可能な出力側クラッチ爪63が設けられた出力側回転体(スプロケット60)と、円筒状部51の他端側に固定可能なプレート80と、出力側回転体及びプレート80に係止され出力側回転体を回転方向に付勢する付勢部材(捩りコイルバネ70)と、を備え、入力側回転体と出力側回転体とは、所定の角度の範囲で相対的に回転可能であり、円筒状部51に対するプレート80の固定位置が回転方向において相対的に変更可能であること。【選択図】図9
