| 摘要 |
An electric power steering device includes a power transmission joint ( 21 ) which coaxially couples an output shaft of a steering assist electric motor to an input shaft of a speed reduction mechanism for power transmission. The power transmission joint ( 21 ) includes first and second engagement members ( 41, 42 ) and an elastic member ( 43 ) disposed between the first and second engagement members ( 41, 42 ). The elastic member ( 43 ) includes an annular main body ( 44 ) and a plurality of engagement arms ( 45 ) provided at a predetermined interval circumferentially of the main body ( 44 ). The engagement arms ( 45 ) are engaged with engagement projections ( 55, 56 ) of the first and second engagement members ( 41, 42 ) circumferentially (X 1 ) of the main body ( 44 ). Power transmission faces ( 46, 460 ) of the engagement arms ( 45 ) include power transmission faces ( 460 ) each having a relatively great interference (d 1 ) and power transmission faces ( 46 ) each having a relatively small interference (d 2 ).
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