Kobayashi, Masaki; Eguchi, Katsuhiko;

Variable valve timing device

A variable valve timing control device includes a rotation member unitary fixed to a rotation shaft for controlling a valve timing assembled to a cylinder head of an internal combustion engine to be rotatable, a rotation transmission member engaged with the rotation member to be relatively rotatable, a vane provided on either one of the rotation member or the rotation transmission member, a hydraulic pressure chamber formed between the rotation member and the rotation transmission member and is divided into an advance angle chamber and a retarded angle chamber by the vane, and a detection member for detecting a relative rotation phase between the rotation member and a crankshaft. The detection member is press fitted into a cylindrical portion formed in an axial direction of the rotation member and the rotation member is fixed to the rotation member by a tightening member.

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What is claimed is:

1. A variable valve timing control device comprising:

a rotation member unitarily fixed to a rotation shaft for controlling a valve timing assembled to a cylinder head of an internal combustion engine to be rotatable;

a rotation transmission member engaged with the rotation member to be relatively rotatable;

a vane provided on either the rotation member or the rotation transmission member;

a hydraulic pressure chamber formed between the rotation member and the rotation transmission member, the hydraulic pressure chamber being divided into an advance angle chamber and a retarded angle chamber by the vane;

a detection member for detecting a relative rotation phase between the rotation member and a crankshaft;

the detection member being press fitted to an external periphery of a cylindrical portion formed in an axial direction of the rotation member, and the rotation member being fixed to the rotation shaft by a tightening member; and

wherein the external periphery of the cylindrical portion is deformed in a radial direction by axial force of the tightening member.

2. A variable valve timing control device comprising:

a rotation member unitarily fixed to a rotation shaft by a tightening member for controlling a valve timing assembled to a cylinder head of an internal combustion engine to be rotatable;

a rotation transmission member engaged with the rotation member to be relatively rotatable;

a vane provided on either the rotation member or the rotation transmission member;

a hydraulic pressure chamber formed between the rotation member and the rotation transmission member, the hydraulic pressure chamber being divided into an advance angle chamber and a retarded angle chamber by the vane;

a detection member for detecting a relative rotation phase between the rotation member and a crankshaft;

the detection member being press fitted to an axially extending cylindrical portion of the rotation member at a position between where an end portion of the cylindrical portion contacts the rotation shaft and where an oppositely located end portion of the cylindrical portion contacts the tightening member.

3. A variable valve timing control device comprising:

a rotation member unitarily fixed by a bolt to a rotation shaft assembled to a cylinder head of an internal combustion engine to be rotatable;

the bolt contacting an axially facing surface at an end portion of the rotation member;

a rotation transmission member engaged with the rotation member to be relatively rotatable;

a vane provided on either the rotation member or the rotation transmission member;

a hydraulic pressure chamber formed between the rotation member and the rotation transmission member, the hydraulic pressure chamber being divided into an advance angle chamber and a retarded angle chamber by the vane;

a sensor wheel adapted to detect a relative rotation phase between the rotation member and a crankshaft;

the sensor wheel being mounted on the end portion of the rotation member at a position where axial tension of the bolt resulting from tightening the bolt to the rotation shaft produces radial expansion of the rotation member which acts on the sensor wheel.

4. The variable valve timing control device according to claim 3, wherein the sensor wheel is press fitted onto an outer periphery of the rotation member before the bolt is tightened to produce the radial expansion of the rotation member.