| 摘要 |
A VVA apparatus includes drive-input and intake-side transmission sprockets provided to an intake-side phase alteration device, an exhaust-side transmission sprocket provided to the exhaust-side phase alteration device, a reduced-diameter portion provided to a housing of the exhaust-side phase alteration device between a housing main body and the exhaust-side transmission sprocket, and a torsion coil spring arranged between the housing and vane rotor of the exhaust-side phase alteration device to bias the two in the advance direction. The torsion coil spring is disposed on the outer periphery of the reduced-diameter portion to have a reduced diameter when the phase is changed from the phase at engine start.
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