초록 ▼

A laser beam emitter is placed at the level of each front wheel and a first laser beam is projected transversely in front of the vehicle onto a first receiver placed in front of the other front wheel. A second laser beam emerging from the same emitter is projected onto a reflecting mirror placed at

A laser beam emitter is placed at the level of each front wheel and a first laser beam is projected transversely in front of the vehicle onto a first receiver placed in front of the other front wheel. A second laser beam emerging from the same emitter is projected onto a reflecting mirror placed at the level of the corresponding rear wheel and the reflected laser beam is transmitted to a second receiver. The different distances read on the receivers are transmitted to the memory of an electronic computer which automatically determines the values of the angles of toe-in and toe-out of the front or rear wheels as well as the set-back or relative axial displacement between the front wheels.

대표청구항 ▼

A method for checking the wheel alignment of the front and rear wheel systems of automotive vehicles as well as for measuring the relative axial displacement or “set-back”of the front wheels, wherein a laser beam emitter is placed at the level of each front wheel and a first laser beam is projected

A method for checking the wheel alignment of the front and rear wheel systems of automotive vehicles as well as for measuring the relative axial displacement or “set-back”of the front wheels, wherein a laser beam emitter is placed at the level of each front wheel and a first laser beam is projected transversely in front of the vehicle onto a first receiver placed in front of the other front wheel whilst a second laser beam produced by the same emitter is projected onto a reflecting mirror placed at the level of the corresponding rear wheel and the second laser beam thus reflected is transmitted to a second receiver, the distance between the point of impact of the laser beam and a zero reference point being then read on each receiver associated with a respective laser emitter, the read values being entered into an electronic computer which processes the data as well as the wheel base and track measurements of the vehicle so as to determine the angles of toe-in or toe-out of the front and rear wheels, and the “set-back”value, said computer computing the following angle values: dd2xtotal angle value of toe-in or toe-out of the wheels of the rear-wheel system, all of said angles being considered by convention as either positive or negative as a function of their location on each side or lines parallel to the line bisecting the angle made by the vertical axial planes of the rear wheels, said bisecting line being such as to constitute the axis of thrust of the vehicle, b=relative displacement between the two front wheels, considered as positive if the right front wheel is displaced in the forward direction with respect to the left front wheel and negative in the contrary case, said relative displacement being defined as “set-back”, c=distance between the axial planes of the front wheels and the vertical planes containing the associated laser beams, v=track, e=wheel base of the vehicle, the following data being recorded respectively on the first and the second receivers each associated with the respective laser emitter: D=distance between the point of impact of the first laser beam and the zero reference defined by the point at which the laser impact would be located if the angles of toe-in or toe-out of the front wheels were zero and if the vehicle had zero set-back, G=distance equivalent to D and recorded on the receiver placed in front of the second front wheel such as the left wheel, for example, D′=distance recorded on the second receiver associated with the right front wheel, between the point of impact of the laser beam reflected from the mirror placed at the level of the right rear wheel and a zero reference point defined by the intersection of the vertical plane containing the laser beam and the vertical plane of the second receiver, G′=distance equivalent to D′and recorded on the second receiver placed at the level of the left front wheel, and the four following equations being solved in the electronic computer: D=(v+2c)db+(ddc G+(v+2c)db-(ddc D′=2e(dxG′=2e(dx