Composite profile evaluating method and composite profile measuring device

A composite profile measuring device for a camshaft that opens and closes an engine valve provided in a cylinder of an internal combustion engine, in accordance with a composite profile of a pair of a fixed cam and a movable cam, comprising:

• a first rotating unit configured to rotate a cylindrical outer shaft on which a fixed cam is provided on an outer circumference thereof;
• a first phase detecting unit configured to detect a rotational phase of the outer shaft;
• a second rotating unit configured to rotate an inner shaft arranged rotatably in interior of the outer shaft;
• a second phase detecting unit configured to detect a rotational phase of the inner shaft;
• a calculating unit configured to calculate a phase difference between rotational phases of the outer shaft and the inner shaft, based on detection results of the first phase detecting unit and the second phase detecting unit;
• a first contact element configured to be displaced along a diametrical direction of the fixed cam by contacting a cam surface of the fixed cam that is rotated together with the outer shaft;
• a second contact element configured to be displaced integrally with the first contact element, and be displaced along a diametrical direction of the movable cam by contacting a cam surface of the movable cam that rotates together with the inner shaft;
• a displacement amount detecting unit configured to detect displacement amounts of the first contact element and the second contact element;
• and
• a recording unit configured to record a detection result of the displacement amount detecting unit in association with the phase difference calculated by the calculating unit.