| 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 (X1) 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 (d1) and power transmission faces (46) each having a relatively small interference (d2).
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