Patent ID: 8038362

Claim:
An assembly error prevention member for a universal joint that includes a yoke body provided with a cylindrical portion having a slit extending in an axial direction and having a first tab and a second tab facing each other across the slit; a fixing member having an annular flange and a through-hole in a sleeve that extends into a bolt through-hole of the first tab, and a fastening member that fastens a shaft that is inserted into the cylindrical portion in an axial direction of the cylindrical portion, to the cylindrical portion by bringing the first tab and the second tab closer to each other, the fastening member including a bolt that is tightened into a bolt hole of the second tab via the bolt through-hole of the first tab and the through-hole of the fixing member, the bolt being engaged with a groove formed in the shaft, the assembly error prevention member comprising: a first plate portion provided along an outer face of the first tab; a second plate portion bent from the first plate portion and extending toward the second tab; and a third plate portion bent from the second plate portion and disposed, at least partially, in the slit, the first plate portion and the third plate portion being substantially parallel to each other, wherein: the first plate portion has an attachment portion that is attached to the yoke body; the third plate portion includes: a blocking portion that moves between a blocking position, where the blocking portion blocks the front end of the bolt to inhibit the bolt from being inserted into the bolt hole, and a non-blocking position, where the blocking portion does not block the front end of the bolt; and a driven portion that moves the blocking portion to the non-blocking position when pushed by one end of the shaft that is inserted into the cylindrical portion; the second plate portion is elastic and elastically urges the blocking portion to the blocking position; the second plate portion has a first end portion that is connected to the first plate portion and a second end portion that is connected to the third plate portion; and the second end portion is wider than the first end portion.