The dynamic 4-wheel alignment instrument can not only check whether all wheels are properly aligned, but also check the technical conditions of the front axle, rear axle, suspension frame, etc., providing a reliable basis for the non-disassembly detection of the chassis. The 4-wheel alignment instrument is a device specially used to detect wheel alignment parameters. The items that can be checked by the 4-wheel alignment instrument include: front wheel toe, front wheel camber, kingpin caster, kingpin inclination, rear wheel toe, rear wheel camber, wheelbase, thrust angle, and left and right wheelbase difference.

General method and specification for automobile tire alignment inspection and testing: It can detect several or all of the above inspection items. In this dynamic 4-wheel alignment test item, wheel toe, wheel camber, kingpin caster and kingpin inclination are collectively called front wheel alignment, also known as the 4 elements of front wheel alignment. All kinds of front wheel alignment instruments can perform their inspection tasks. However, the vehicle's handling stability is not only guaranteed by the front wheel alignment, but the rear wheel alignment also plays a particularly important role. Therefore, try to use the 4-wheel alignment instrument for inspection and adjustment.

The structure and principle of the dynamic 4-wheel alignment instrument. The sensor of the 4-wheel alignment instrument. It consists of the upper sensor body, the lower sensor body and the side end cover. There are two mutually perpendicular sensor sockets arranged on the upper sensor body, one is the installation socket for detecting the kingpin inclination angle, and the other is the installation socket for detecting the kingpin caster angle and toe. There are roller bearings in the installation sockets to ensure that the sensor swings lightly and freely after being installed on the wheel fixture. The level bubble on the upper cover of the sensor is used to check whether the sensor is installed vertically. The locking knob is used to lock the sensor so that the sensor shell can rotate with the wheel. There are two precision potentiometers in the lower sensor body. The shell of the precision potentiometer is fixed on the lower sensor body.

When the sensor housing changes with the wheel camber angle or the wheel rotates, it drives the potentiometer brush to move, changes the voltage divider resistance, and then transmits a voltage with a corresponding ratio relationship with the detection value of the wheel camber angle, kingpin caster angle or kingpin inclination angle. The instrument calculates and displays the wheel camber angle, kingpin caster angle or kingpin inclination angle value. The shock-absorbing damper is composed of a heavy hammer that also serves as a damper piston and a damper working chamber to avoid the drag of the heavy hammer, improve the test speed and inspection precision. The shielded wire conductor is connected to the instrument on the sensor cable connector to transmit the angle information to the computer for detection. The inner side of the side end cover is stained with a metal plate to shield the influence of external electromagnetic waves.