Importance

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Abstract

A valve timing control device for adjusting the timing of opening a valve of an internal combustion engine includes a torsion spring having one end engaged with a shoe housing and the other end engaged with a vane rotor to urge the vane rotor, relative to the shoe housing, toward the advancing side or the delaying side. The end of the torsion spring engaged with the vane rotor is rotatable together with the vane rotor and inwardly directed in the radial direction, referencing the torsion spring. The vane rotor has a hook groove with which the inwardly-directed end of the torsion spring is engaged. Thus, a driven member having the vane rotor can be made smaller. Also, there is no need to form the hook groove inside the vane, so vane strength is not compromised and sealing with the vane is attained.

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First Claim