| 主权项 |
1. A valve timing control apparatus that changes relative rotational phase between a drive shaft of an internal combustion engine and a driven shaft to adjust opening timing and closing timing of an intake valve or an exhaust valve, which is opened and closed by the driven shaft that is driven by the drive shaft, the valve timing control apparatus comprising:
a housing that includes:
a front plate;a rear plate that is opposed to the front plate; anda peripheral wall that connects between the front plate and the rear plate, wherein the housing is rotated when a drive force of the drive shaft is conducted to the housing; a vane rotor that includes:
a rotor that is fixed to the driven shaft; anda vane that outwardly projects in a radial direction from the rotor and partitions an oil pressure chamber formed in an inside of the housing into an advancing chamber and a retarding chamber, wherein the vane rotor is rotatable relative to the housing; a lock pin that is reciprocatable in an axial direction in an inside of a receiving hole, which extends through the vane rotor in the axial direction, wherein the lock pin is insertable into a fitting hole, which is formed in one of the front plate and the rear plate; at least one pressure chamber that is communicated with the advancing chamber or the retarding chamber and receives an oil pressure that applies a force to the lock pin in a removing direction that is a direction for removing the lock pin from the fitting hole; and an air discharge hole, at least a portion of which is formed in the lock pin, wherein: the air discharge hole communicates between the at least one pressure chamber and an atmosphere in a state where the lock pin is inserted into the fitting hole; and the air discharge hole blocks communication between the at least one pressure chamber and the atmosphere in a state where the lock pin is removed from the fitting hole. |
