JPS61186808A - Measuring method for wheel alignment of automobile - Google Patents

Abstract

PURPOSE:To measure wheel alignment by fixing and holding a steering wheel at its neutral position previously, and then measuring the camber angle of each wheel and correcting an reference toe value. CONSTITUTION:While the steering wheel is fixed and held at the neutral position previously, measurement plates 1a-4a are pressed an camber angles of respective wheels are measured. Then the half of the difference in camber value between right and left front wheels Wfr and Wfl is multiplied by a coefficient determined by tires and the load placed on the tires to find values theta1 in the directions of the right and left front wheels Wfl and Wfr. On the other hand, the difference in camber angle between the right and left rear wheels Wrr and Wrl is multiplied by a coefficient determined by the tires and the load placed on the tires to find values theta2 in in the direction of the right and left rear wheels Wrr and Wrl. Further, the reference toe value is corrected by calculating the sum of the value theta1 and theta2 in both directions and the difference between or sum of preset reference toe values of the right and left front wheels Wfr and Wfl, thereby indicating toe adjustment commands Qrt and Qlt.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application The present invention relates to a method for measuring wheel alignment of a motor vehicle.

Here, wheel alignment is used to include both the toe and camber angles, and refers to the inclination of the single wheel relative to the direction of travel of the vehicle when viewed from above. With respect to the direction, if g@front end side is inclined towards the inside of the vehicle, it is called full toe-in, and if it is inclined outward, it is called tt toe-out. However, camber use refers to when the vehicle inspection center plane is vertical when looking at the front view of the vehicle.

BACKGROUND OF THE INVENTION Wheel alignment and apparatus for this type of automobile are disclosed, for example, in Japanese Unexamined Patent Publication No. 57-100307 and Japanese Utility Model Application No. 57-160609.

For example, if '#Kai No. 57-100307,
The sensor plate shown in Figure 3 is pressed against the side of each wheel, and the direction A between the front and rear of each wheel is placed on the sensor plate.

The process of finding B, C, and D, and the 3Ak table B of the difference between 1 straight C and D of the left and right rear wheels. dβ in the direction of and the value A of C1 left and right front steepness,
A process of finding the difference between B as the value α in the direction of the former and the latter,
The difference between the diameter values C and D of the left and right rear wheels and the car direction β in the direction of the vehicle is taken as the correctness C value of the left and right rear wheels, and the diameter values A and B of the left and right front wheels and the direction of the vehicle are The correlation with the value β is the difference between the left and right front wheels. Part 1 includes a and t to be calculated on jl[' of n.

If the change is made, the front wheel toe is adjusted using the corrected γL9 toe value (the difference between the values of A and Bj and around α), and at the same time the off-center value (α-β) is zero. Basically, the steering wheel metal is installed in the position where it is. In other words, first, the direction of the front width is determined so that the vehicle will be in a straight-ahead state, and the steering wheel is attached to match the direction of the vehicle.

On the other hand, in Japanese Utility Model Application Publication No. 57-160609, the toe and Φ yen/par Fl are simultaneously measured, but feedback to the fc toe coin is not provided based on the direct measurement of the Φ yan bar angle.

Problems to be Solved by the Invention This technique is difficult to overcome in the conventional technology.In some cases, the direction in which the vehicle is traveling is unclear due to the shadow of the camber angle, and the steering wheel is installed at an angle when the vehicle is traveling straight. There are times when it happens.

Even if the influence of the camber on the upper grip is eliminated, the relationship between the peaks and valleys of the serrations at the joint between the steering shaft and the steering wheel does not necessarily correspond to the neutral position of the steering wheel. There is no guarantee that they will match.

For example, the steering wheel may be installed tilted by the maximum amount of serrations even though the front width is in a straight-ahead state.

The present invention eliminates the above two intervening points t' and provides a nine-wheel alignment measurement method @.

Ninth way to solve the problem First of all, what about the steering wheel? Neutral position [
In more detail, rather than holding the steering wheel fixed at the neutral position and then adjusting it to the toe reference fli!' by measuring each car's can angle (- angle? For example, press a measuring plate against the camber and measure the camber of each 4 mm.

Then, the value θ1 of the direction of the left and right front wheels is obtained by multiplying the one-shift difference Q1/2 between the camber angles of the left and right front wheels by the tire and the load applied to the tire by the thread a determined by F. The value of the difference in the value of 0 is multiplied by a series centered on the tire and the load on the tire to obtain the value of 0 in the direction of the left and right rear wheels. seek.

Furthermore, the values θ1 in both directions. The toe reference value t' is corrected by calculating the difference or sum between the phase of θ and the preset toe reference value of the left and right front wheels, and the toe i of the left and right front wheels is calculated, and the 14m target value Qrt, , Q/l is obtained. , which indicates the following.

As described above, in the present invention, the steering wheel is first fixed and held in the neutral position, and then the steering wheel is fixedly held in the neutral position, and then the steering wheel is fixedly held in the neutral position.
At the same time, the toe base rate value of the left and right front situation of F is corrected to the value in this direction and used as the toe adjustment target value.
Except for the influence of the camber angle on the vehicle's lfa, the steering wheel will not be installed tilted.

Embodiment FIG. 1, a3) and FIG. 2 are explanatory diagrams showing one example of the uninvented method.

, II Figure 2) and ■), the predetermined measurement position t
For the 19 vehicles Bo, the serrations are connected to the steering shaft (not shown) and the jig VC of the steering wheel 'kPk* is fixed and held at the middle position.

And each wheel Wfr, Wfi, Wrr,
Nine measuring plates 1a + 2a * 3a, 4 are attached to the measuring units 1.2, 3.4 against the side of the Wry.
aτ shield and touch each wheel Wfr, WfJ, Wrr,
Measure the Φ Yanbar month of Wrl. That is, the measuring plate 1
From the slope of a+2a+3a+4a, the base 4 line L of the measuring device
Each car for 0 - Wfr, WfJ, wrr, wr
it v tilt? Find, then Qfr, Qfl,
Qrr, qrA! , a series determined by the tire, tire, and load applied to the tire.

-1) Ma5: ff-sull/gupa17-t-cPf (front 1ftii), CPr (rear width), camber thrust CTf (front wheel).

CTr (rear width).

Then, (as shown in the formula, the value U of the direction of the vehicle B is determined by multiplying 1/2 of the difference between the camber angle i[Qfr, Qf/ of the left and right front @Wfr, Wfβ by the above-mentioned coefficient, and the front - .

Find it as.

For the rear wheel side, it can be found in the same way as shown in equation (2).

Here, θ1. θ, Hg1 The direction r shown in the figure is the planu side.

To the arrow, θ1. Using the value of U, the toe reference value Q of the left and right front @ 'Wfr, Wfl that has been set in advance
Modify t. This is a design value that is predetermined as the toe reference box Qt here. That is, +31, f4
) values θ, and #! in both directions, as shown in Eq. By finding the sum of the phase and the toe reference value Qt, the right front wheel Wfr
The value of both directions is θ, and θ! By finding the difference between the sum of
7? Let it be t.

Sekimon” Diarrhea Triji 4th collar 1m Q r t, =Q
t + (θ, 10,) ...... IX () left front - toe A orange eye S + straight Q/i, = Qt - (#111t) ...... (41, these n etc. Perform computer VC engineering using AI'X.
Ru.

Then, n friend left and right front transfer Wfr obtained as above,
Wfl's To, Af's ml Direct Qrt, Q/l'7 For example, Machijiri Omote Boshi, Koq) I11! Based on this, it is sufficient to apply the to-toned shu of the left and right l@saku.

Inventive effect As described above, if the present invention is used, the steering wheel'k
I:F'f, hold it fixed at the position, and then find the value in that direction from the camber angle of #Yokozuna.

In this direction, Osamu Saishimae's TO standard 11.1 k1
In other words, this is the expected toe adjustment value. After nine months,
= Cedar seepage for camber for both straightness has been removed.
t.The steering wheel will not tilt when installed.

Brief Explanation of 4 Bad Sides Figure 4c1+AJ is an explanatory plan view of a vehicle showing an embodiment of the method of the present invention, and Figure 41 iBl is an explanatory front view thereof.

FIG. 2 is a flowchart showing the process of dipping, and FIG. 3 is an explanatory diagram of the conventional measuring method.

1, 2, 3, 4...-Measurement unit, Wfr
, Wfl・”Mae・Can, wr r # W r A・・
・Rear wheel, σ1. U,...direction.

2 outsiders L.

Figure 2

Claims (1)

[Claims] (1) Measure each single camber angle with the steering wheel fixed and held in the neutral position in advance, and calculate a coefficient determined by the tire and the load applied to the tire to 1/2 of the difference between the camber angle values of the left and right front wheels. Multiply to find the direction value (θ_1) of the left and right front wheels, and multiply 1/2 of the difference between the left and right camber values by a system determined by the tire and the load applied to the tire to find the direction value (θ_1) of the left and right rear wheels. θ_2
), and by calculating the difference or sum between the phase of the values (θ_1, θ_2) in both directions and a preset toe reference value for the left and right front wheels, the toe reference value is corrected and the toe adjustment target for the left and right front wheels is determined. A method for measuring wheel alignment of an automobile, characterized by instructing values (Qrt, Qlt).