| 摘要 |
A wheel alignment device comsists of a pair of identical tools. Each has a protractor with teeth mesh with a graduted gear at which an indicator points at. A string connects the protractors' centers. An equivalence has a protractor with teeth mesh with a gear which meshes with a sleeve or worm gear travels on a bolt and along a scale. As the sleeve rotates around the bolt it turns the gear and the protractor. A string connects the protractors' centers. The tools above are located on a plane parallel to the wheel's axle and perpendicular to the vertical line for toe angle measurements. The tools above are located on a plane parallel both to the wheel's axle and the vertical line for camber measurement only or replacing the connecting string by attaching a plumb line to the center or a level vial to the zero mark of the protractor for both camber and caster measurements. A tool measures the steering angle of a wheel comprises a sliding block that has a protractor on top and a guiding pin at the center of the protractor to allow an indicator which is fixed to the wheel to rotate and translate about the protractor. As the wheels turns, the indicator acts on the guiding pin to push the sliding block along the guiding track. The angular displacement of the wheel is the intersection of the indicator and the protractor.
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