LT5941B - Automobile wheel alignment errors detection device - Google Patents

Abstract

Invention is related to devices field, especially for automobile wheel alignment errors detection devices. In order to simplify the construction, the device consists of frame (1) with plate (3), fixed on to the basis, error detection scales (7). Frame (1) is attached to the wheel base of the approach side. And over its length next to one another it is loosely arranged metal rods or tubes (2), which are covered by metal plate (3), fixed to the frame (1) in one point of the automobile wheel approach side. It has opportunity to rotate around its vertical axis and at its other end is fixed the laser beam gauge and in its beam zone at a certain distance is set error detection device.

Description

The invention relates to the field of devices, in particular to devices for determining wheel alignment error.

It is very important that the wheels of the vehicle are properly adjusted at a certain angle with respect to the body and chassis elements to ensure proper vehicle stability and control. All this ensures the maneuverability of the car, reduces tire wear and fuel consumption. Various bumps and loads occur on the chassis with permanent deformation during operation. For the sake of economy, such cars are not always repaired and sometimes impossible. Often such vehicles continue to operate, and fine tuning of their wheel alignment is not possible because there are no computer programs that can account for changes in the dimensions of deformed parts or changes in caster angle. Therefore, it is often cheaper to restore the wheel alignment rather than the wheel geometry, but to adjust the wheel alignment to its current position so that the wheel rolls without lateral force.

There is a known method of wheel alignment and a device that determines the position of the vehicle wheel, aligns the current data with factory presets, and enables tracking of the deviation correction process. The visualization system process uses configuration of geometric properties in 3D space (three-dimensional X, Y, Z coordinate system) for wheel positioning and spatial orientation (see US 2011185584, G01B5 / 255, 08-08-2011).

This is fine positioning, but only for new and little used cars. For used cars, due to the wheel geometry factory deflection, its full potential is not fully utilized, and even after making adjustments, the desired result may not always be achieved. In addition, the unit is sophisticated, expensive and time-consuming to adjust the wheels.

There is a known vehicle wheel alignment device consisting of a moving plate mounted on a vertical axle fixed on a chassis which has a slant allowing access to one of the two wheels mentioned above. The moving plate rotates with respect to the chassis due to lateral forces and the angle of rotation is indicated by markings on them. Six roller bearings are provided for turning (see FR2656685 (A1) G01B5 / 255, 1991).

The unit specified is of complex construction consisting of more than 20 parts, bearings, springs. Its use is complicated by the need to accurately determine the center of both wheels of the car, and a slight deviation from the line will stop the plate from turning because the center of gravity shift will cause the plate to lean and not move. Such flaws do not always make it possible to see the resulting lateral forces and are time consuming.

The object of the invention is to simplify the construction, to lower the cost of the equipment and to improve the performance.

The object of the invention is achieved by the fact that in a car wheel alignment error detector device consisting of a frame with a plate mounted on a base and an error setting scale, the frame is fixed to the base at the wheel side and freely spaced along its length. the other being metal rods or tubes covered by a metal plate fixed to the frame at one point on the driving wheel of the car, capable of rotating about its vertical axis and having a laser beam transducer at its other end and an error detection scale at a certain distance.

The invention is explained in the figures:

Figure 1 is a schematic diagram of the device (1-1 is a sectional view of the frame).

Figure 5a is a diagram showing the wheel alignment angle too positive.

the diagram shows the wheel alignment << is negative.

The car wheel misalignment detector consists of a frame 1 attached to a base (the anchorage is marked A in Figure 1), metal bars or tubes 2, plates 3 attached to a frame 1 and capable of rotating about its axis (the anchorage is marked B in Figure 1). , car wheels 4, 5, laser beam sensor 6, error setting scales 7.

The car wheel alignment error detector works as follows.

Before starting work, the steering wheel of the car is mechanically locked in a straight-ahead position so that there is no turning during the passage through the plate. This can be achieved by using the steering wheel 'lock' position or by using an additional device. As the wheel alignment parameters also change with the weight of the load being transported, it is advisable to drive with the most common weight (number of passengers). With the car wheel 4 on the plate 3 with the wheel alignment well adjusted, the lateral force is zero. The plate 3 does not move in one direction relative to the frame 1, and the radius of the free end edge of the laser sensor 6 mounted on the plate 3 shows a zero fraction on the error setting scale 7. In the case of positive alignment, a lateral force is exerted which pushes plate 3 to the left (viewed in the direction of travel of wheel 4) while pushing the metal bars 2 to the left, the latter pushing frame 1 also to the left (Fig. 2). The radius of the laser sensor 6 on the error setting scale 7 indicates the positive divisions. In the event of a negative alignment, a lateral force is exerted which pushes the plate 3 to the right while pushing the metal bars 2 to the right, which also push the frame 1 to the right (Fig. 3). The radius of the laser sensor 6 on the error setting scale 7 indicates the negative gradations. The offset of frame 1 is proportional to the size of the wheel alignment misalignment, and the greater the offset, the greater the potential for tire wear, resulting in all other adverse effects such as fuel overload, chassis wear, loss of vehicle stability and maneuverability. In the event that the wheel geometry is not restored, the proposed device can adjust the wheel alignment to the current wheel geometry so that the wheel is rolling without lateral force. Of course, it is not advisable to do this if the wheel tilt is not optimal. This can also be checked with a simple spirit level.

Compared to the prototype, the new technical solution easily makes it possible to detect the occurrence of unnecessary lateral force and to adjust the wheels so that their lateral force is zero. the unit is simple in design, cheap, easy and simple to operate.

Claims (1)

DEFINITION OF INVENTION 1. A vehicle wheel alignment error setting device comprising a frame with a plate mounted on a base, wherein the frame is fixed to a base at the wheel side of the wheel, and metal rods are freely spaced along one another along its length; tubes covered by a metal plate fixed to the frame at one point on the car wheel's turn, capable of rotating about its vertical axis, and having a laser beam transducer at its other end and a deflection dial at a certain distance within its radius.