Automobile wheel alignment device and method

摘要

An apparatus and method for measuring toe in vehicle wheels. The apparatus ordinarily includes a pair of head units. Each of the head units is mounted upon one of the front wheels of the vehicle. Each head unit includes a projecting element for projecting a light beam generally laterally across the front of the vehicle and onto a target on the opposite head unit in determining front toe of the respective front wheels. Each head unit can also project a beam generally axially from the front wheel of the vehicle to a reflector on the adjacent rear wheel for determination of rear toe of the respective rear wheels. A metering device is connected operatively to signal generators on the head units for determining the toe in each front wheel in relation to a thrust-line reference calculated from the total rear toe of the vehicle.