Importance

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Abstract

A wheel alignment measuring apparatus of the invention has angle measuring instruments joined up with the input of an electronic signal processing unit. A first and a second angle measuring instrument (1, 2) are placed on a nearside and on an offside front wheel support turntable respectively for sending in each case a signal representative of the steering angle of the front wheels to the signal processing unit. The processing unit calculates therefrom the steering difference angle. A third and a fourth and furthermore a fifth and a sixth angle measuring instrument are so placed in the one case on the nearside and in the other case on the offside front wheel that by way of the signal processing unit on the footing of changes in the output signals of the first and the third and on the other hand of the second and fourth angle measuring instruments the caster of the nearside and of the offside front wheels may be calculated. On the basis of the changes of the output signals of the first and fifth and on the other hand of the second and sixth angle measuring instruments, the king pin angles of the nearside and of the offside front wheels may be calculated. By the apparatus of the invention readings may, therefore, be produced for the steering difference angle, the caster and the king pin angles in only one measuring operation.

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First Claim