| 主权项 |
1. An installing structure for an electric variable valve timing apparatus, wherein
the electric variable valve timing apparatus includes
a sprocket unit, which is attached to a camshaft of an internal combustion engine, andan electric motor, which is coupled to the sprocket unit, the sprocket unit includes
a first rotor, which is fixed to one end of the camshaft,a second rotor, which surrounds a circumference of the first rotor,a sprocket, which is provided integrally with an outer periphery of the second rotor, wherein a timing chain of the internal combustion engine is looped over the sprocket, anda varying mechanism, which is provided between the first rotor and the second rotor to couple the first rotor and the second rotor while allowing the rotors to rotate relative to each other, the electric motor is fixed to a chain cover, which covers the timing chain, with bolts and is coupled to the varying mechanism to actuate the varying mechanism, the chain cover includes a plurality of bosses each having an internal thread to which one of the bolts is threaded, the bosses extend from the chain cover toward the sprocket unit to positions at which the bosses face an outer periphery of the sprocket unit in a radial direction, and the bosses are arranged such that
when the sprocket unit moves vertically downward from an attaching position, at which the sprocket unit is attached to the camshaft, at least two bosses are engaged with the sprocket unit to restrict vertically downward movement of the sprocket unit, andthe sprocket unit is allowed to move between a location outside of a space covered by the chain cover and the attaching position. |
