JPH0777482A - Calculating method for toe adjustment value in wheel alignment - Google Patents

Abstract

PURPOSE:To provide a toe adjustment value compatible with an actual travel by taking into account the straight traveling property of a vehicle under test on rollers. CONSTITUTION:Rollers 9 mounted with wheels of a vehicle under test to rotate them, alignment testers 3, 4, 5, 6 having multiple distance sensors 50 facing the wheels and capable of measuring at least toes, and an arithmetic unit 106 capable of calculating at least toe values and toe adjustment values based on the distance information from the alignment testers 3, 4, 5, 6 are provided for the calculating method of the toe adjustment values in wheel alignment. The rollers 9 are rotated at a high speed equivalent to the vehicle speed, and the wheels on the rollers 9 are made movable in the axial direction based on the alignment state. The shift quantities of the wheels or the pressing force or tension corresponding to the shift quantities are measured, the measured values are inputted to the arithmetic unit 106, and the advance direction of the vehicle under test on the rollers 9 is calculated. The toe adjustment values are newly calculated based on the data of the advance direction and the toe adjustment values by the toe values.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of calculating a toe adjustment value in wheel alignment, which takes into account straight running performance on a bench and obtains a toe adjustment value suitable for actual traveling.

[0002]

2. Description of the Related Art Conventionally, various measuring methods and measuring apparatuses have been proposed for measuring wheel alignment of an automobile. For example, in Japanese Unexamined Patent Publication No. 2-309210, a sensor unit in which a plurality of ultrasonic sensors are independently movable in XY directions is provided, and the sensor units are made to face a side of a wheel of a vehicle under test and are placed on rollers. The alignment of each rotating wheel is measured.

When such an alignment measuring apparatus is used in, for example, an automobile production line, generally, the toe is measured, and the toe adjustment value is calculated in the case of the pass / fail judgment and the failure, and the result is adjusted by the toe. Needs to be displayed for work.

[0004]

However, the conventional dynamic alignment measuring device rotates the wheel at a low speed, measures the toe exclusively by measuring the distance between the wheel and the measuring device, and adjusts the toe based on this toe value. Since the value was calculated, there was a problem that the difference in the operation and the function of the wheel between the measurement and the actual traveling was not reflected.

The present invention solves such a problem, reflects the behavior of the wheel on the roller rotating at a high speed, and makes it possible to obtain a toe adjustment value which is sufficiently adapted to actual traveling. It is intended to provide a calculation method.

[0006]

Therefore, the method of calculating the toe adjustment value in wheel alignment according to the present invention is capable of measuring at least the toe by mounting the wheel of the vehicle under test and rotating the roller. A method for calculating a toe adjustment value in wheel alignment, comprising: an alignment tester having a plurality of distance sensors; and a calculator capable of calculating at least a toe value and a toe adjustment value based on distance information from the alignment tester. Is rotated at a high speed corresponding to the vehicle speed to allow the wheels on the rollers to move in the axial direction based on the alignment state, and the moving amount of the wheels or the pressing force or tension corresponding to the moving amount is measured, and the measured value is Input to the arithmetic unit to calculate the traveling direction of the test vehicle on the roller, and the toe adjustment value based on the traveling direction data and the toe value. Based on, and in, characterized in that to correct the toe adjusted by toe values, and to obtain the toe adjustment value adapted to the actual running.

[0007]

[Operation] Rotate the roller at a high speed equivalent to the vehicle speed, make the wheel on the roller behave based on its alignment, observe the behavior, and measure the displacement or considerable amount of the wheel or car body at that time. Then, the traveling direction of the test vehicle,
That is, the straight running performance based on the toe is measured. And
By adding the above-described data of the traveling direction of the test vehicle to the calculated data of the toe adjustment value, the toe adjustment value based on the conventional toe value can be corrected, and the toe adjustment value more suitable for actual traveling can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An illustrated embodiment in which the present invention is installed in an automobile production line will be described below. In FIGS. 1 to 12, 1 is a work floor, and a pit 2 is provided on the floor 1.

At the bottom of the pit 2, front wheel alignment testers 3, 4 and rear wheel alignment testers 5, 6 are provided.
And are spaced apart from each other. These alignment testers 3, 4, 5 and 6 have substantially the same configuration, and the rear wheel alignment testers 5 and 6 are provided so as to be able to move forward and backward with respect to the front wheel alignment testers 3 and 4.

The alignment testers 3, 4, 5 and 6 are
A machine frame 7, which is fixed or movable at the bottom of the pit 2,
8, a roller 9 provided on the machine frames 7 and 8, and a sensor unit 10 movably provided to the side of the roller 9.

Of these, the machine frames 7, 7 of the front wheel alignment testers 3, 4 are fixed to the bottom of the pit 2, and the machine frames 8, 8 of the rear wheel alignment testers 5, 6 are
The lower part is fixed by a connecting plate 11, and slide guides 12 are provided at both ends thereof, and the guides 12 are slidably fitted to rails 13 laid at the bottom of the pit 2.

At the bottom of the pit 2 located at the rear of the machine frame 8 is provided a wheel base adjusting device 14 having a ball screw mechanism which is rotationally driven by a motor, and is screwed to the screw mechanism to move in the axial direction. The tip of the rod 15 is fixed to the connecting plate 11.

A pair of guide rails 16 and 17 are arranged in the left-right direction inside the upper ends of the machine frames 7 and 8, and a frame 18 for supporting the sensor unit 10 stands at the outer positions thereof. It is set up. Of these, the guide rail 1
A pedestal 20 is slidably attached to the sliders 6 and 17 via a slide guide 19, and a sliding operation is restricted via a lock cylinder 21 during measurement or the like.

A pair of bridge frames 22, 2 are provided on both sides of the pedestal 20.
3 are erected up and down in front and back, and the mounting plate 2
4, 25 are fixed in the front-rear direction at substantially the same height as the work floor surface 1. A plurality of rollers 26, 2 are mounted on the mounting plates 24, 25.
7 are arranged to face each other in a substantially V shape, and these can be engaged with the wheels of the vehicle under test.

A table plate 29 is arranged on the pedestal 20 via a spacer 28, and a large number of steel balls 31 are accommodated in the upper surface of the plate 29 via an annular groove 30. A bearing 32 is provided at the center of the table plate 29.
A shaft 33 is rotatably erected via a spring, and a spring 34 is stretched between a lower end of the shaft 33 and a fixed position of the gantry 20.

A turntable 35 is fixed to the upper end of the shaft 33, the lower surface of which is rotatably engaged with the steel ball 31, and a pair of guide rails 36 are arranged on the upper surface in the front-rear direction. . Slide guide 3 on the guide rail 36
The base plate 38 is mounted so as to be slidable in the front-rear direction via 7, and its movement is restricted via a lock cylinder 39 at a predetermined time such as during measurement.

A pair of frame frames 40 are fixed on the base plate 38 so as to be spaced apart from each other, and a pair of bearings 41 are provided on the upper surfaces thereof, and a pair of rollers 9 are rotatably supported by the bearings 41. .

A sprocket 42 is provided on each shaft of the roller 9, and a motor 43 is provided on a base plate 38 immediately below the rollers 9 and 9, and a drive sprocket 44 for the motor 43 is provided.
A chain 45 is wound between the sprocket 42 and the sprocket 42.

In the figure, 46 is a tension sprocket and 4
Reference numeral 7 is a roller brake, and 48 is a guide roller rotatably provided at the center of the inner frame 40, and its upper portion projects above the upper peripheral surface of the roller 9.

On the other hand, the sensor unit 10 is installed on the upper end portion of the machine frame 18 which is located substantially on the same height as the work floor surface 1,
This is a movable base 49 that can move back and forth, left and right on the machine frame 18.
And a sensor mounting plate 51 having a plurality of sensors 50 mounted on the plate surface. Of these, the movable base 49 includes a first movable base 52 that is movable in the left-right direction, that is, a direction orthogonal to the approaching direction of the test vehicle, and a second movable base that is movable in the front-back direction, that is, the same direction as the approaching direction of the test vehicle. And 53.

The first movable table 52 has a pair of front and rear rails 54 fixed on the machine frame 18, and a pair of slide guides 55 slidably fitted on the rails 54.
5 is fixed to the first movable table 56.

On the machine frame 18, a screw shaft 58 is rotatably supported in the same direction as the rail 54 via bearings 57, 57, and one end of the shaft 58 is coupled to the coupling 5.
It is connected to the drive shaft of the motor 60 via 9. A screw guide 61 is screwed onto the screw shaft 58, and the guide 61 is fixed to the lower surface of the first movable table 56.

On the upper surface of the first movable table 56, a pair of rails 62 are fixed in the direction orthogonal to the rails 54, and a slide guide 63 slidably fitted to the rails 62 is a slide guide 63. 2 is fixed to the lower surface of the movable table 64, a rack (not shown) is fixed to the side end portion of the table 64, and a drive gear (not shown) of the motor 65 installed on the first movable table 56 is fixed to the rack. It is in mesh.

A pair of plate holders 66 are erected on one end of the second movable table 64, and a pair of brackets 67 are provided on the holder 66.
A guide rod 68 is installed on the. Guide rod 6
A guide 69 is slidably fitted in the guide 8, and the sensor mounting plate 51 is fixed to the guide 69.

A rack (not shown) is vertically arranged on the sensor mounting plate 51, and a drive gear (not shown) directly connected to the motor 70 meshes with the rack so that the sensor mounting plate 51 can be moved up and down. I have to.

Further, three ball screws 71, 72, 73 are rotatably installed on the sensor mounting plate 51. Of these, the ball screws 71, 72 are horizontally arranged coaxially with each other, and the ball screw 73 is the ball screws 71, 72. It is vertically arranged at a higher position.

A gear box 75 is provided between the ball screws 71 and 72 via a coupling 74, and an intermediate shaft 77 is provided between the ball screw 73 and the gear box 75 via a coupling 76. The gear 78 is fixed to the shaft 77. A gear 79 meshes with the gear 78, and a motor 80 is directly connected to the gear 79.

One of the sensor holders 81 for holding the sensor 50 is mounted on the ball screws 71, 72, 73, and the ball screws 71, 72, 73 are provided at positions close to each other.
The guide rod 82 is installed in parallel and the rod 8
The other sensor holder 83 is slidably attached to 2.

On the other hand, the front and rear wheel alignment testers 4,
The base ends of the cylinders 84 and 85 are swingably connected to the lower ends of the machine frames 7 and 8 of No. 6, and the tip end of the piston rod 86 is connected to one end of the overhanging piece 87. Overhanging piece 8
The other end of 3 is fixed to a swing link 88, and the link 88 is pivotally attached to the connecting plates 90 and 11 via a pin 89.

At both ends of the swing link 88, links 91,
One end of 92 is rotatably connected, and the links 91, 92
One end of the swing lever 93 is rotatably connected to the other end of the. The swing lever 93 is a bearing 94 provided on the machine frames 7 and 8.
Is rotatably supported through the swing arm 9 at the other end.
5 are rotatably connected.

The other end of the swing arm 95 is rotatably connected to a mounting piece 96, and the piece 96 is fixed to the sensor frame 97. A pair of guide rods 98 are provided on the sensor frame 97 so as to project, and a linear ball bearing 99 is slidably mounted on the rods 98.

The linear ball bearing 99 is mounted on the frame 18
The sensor frame 97 is fixed to a bridge plate 100 installed on the upper end of the sensor frame 97 so that the sensor frame 97 can project to the roller 9 side. The sensor frame 97 is provided with a projecting piece 101, and the projecting piece 101
A roller 102 is rotatably supported at the tip of the roller 1.

The overhanging piece 101 is a guide plate 101.
A load cell, which is a weight sensor, is provided so as to be slidable by a small amount in the longitudinal direction between a and 101b, and has a contact piece 103 attached to the base end thereof, and the piece 103 is fixed to the sensor frame 97. It is in contact with 104.

The output terminal of the load cell 104 is connected to the second computing unit 106 via the first computing unit 105 that converts the propagation time of ultrasonic waves into a distance signal, and the input from each load cell 104 is input to the computing unit 106. The toe adjustment value of each wheel can be calculated based on the information stored in advance under the conditions. The second computing unit 106 is connected to the drive circuit of the motor 43, and stops the drive of the motor 43 when there is a load cell input of a certain value or more corresponding to the reject value.

That is, in the second calculator 106, the measured value of the distance between each sensor 10 and the predetermined position on the side surface of each wheel measured via the sensor 50 of each sensor unit 10, and the sensor 10 Measured through a distance sensor (not shown) such as a potentiometer arranged at a predetermined position,
The XY position on the plane of each wheel can be input.

The arithmetic unit 106 receives these inputs,
The toe value of each wheel and the toe adjustment value based on the toe value are calculated, and the center position of each wheel and the XY position on the plane of the center position are calculated, and the center positions are connected to obtain. The virtual center of the test vehicle is determined, and the toe adjustment value is calculated based on the center value so that it can be corrected.

The calculator 106 further calculates the toe adjustment value by adding the input value of each load cell 104, which is the straight running property data of the test vehicle, to the corrected toe adjustment value,
This can be corrected. As a correction method in this case, for example, the toe adjustment value of each wheel is calculated according to the input value of the load cell 104 or the ratio thereof, or the difference between the output values of the load cells 104 of the left and right wheels is calculated, and the difference is calculated. Accordingly, the toe adjustment value of the wheel having the larger input value of the load cell 104 is calculated and corrected, or the toe adjustment value of each wheel is calculated according to the input value of the load cell 104 for the wheel corresponding to the rejected toe value. I am trying.

In the figure, 107 indicates the corrected toe adjustment value as CR.
An indicator displayed on T, 108 is a cylinder for urging the gantry 20 inward, 108 is a spring stretched between the guide plate 101a and the gantry of the load cell 104,
The plate 101a is biased toward the load cell mount side to compensate for the zero point of the load cell 104. The work floor 1 and the alignment testers 3, 4, 5,
Between the mounting plates 24 and 25 of 6 and the mounting plates 24 and 25
A suitable bridge plate (not shown) is bridged between the two.

In the above embodiment, the load cell 10
Although the toe adjustment value is corrected by the input of 4, when the test vehicle is fixed using a wire or the like during the test, the measured value of the tension detector for detecting the tension of the wire or the like is used instead of the load cell 104. The data may be input to the second computing unit 106. In short, any detection method or detector may be adopted as long as the data indicating the traveling direction of the test vehicle on the rollers 9 and 9 can be obtained. Good.

Using the apparatus of the present invention having the above-mentioned structure,
When correcting the toe adjustment value of the assembled test vehicle, the test vehicle is entered into the alignment tester 3, 4, 5, 6 from the direction of arrow B in FIG.

Prior to entering the test vehicle, the vehicle type and model information of the test vehicle is input to the wheel base adjusting device 14, or the wheel base value of the test vehicle is directly input to operate the device 14 to move the rod. Connecting plate 1 connected to the tip of rod 15 by expanding and contracting 15
1 is pushed and pulled to move the rear wheel alignment testers 5 and 6 integrated with the plate 11 along the rails 13 and 13,
The distance between the rollers 9, 9 on the front and rear wheel alignment testers 3, 4, 5, 6 is adjusted and set to a predetermined wheel base value.

In this case, the alignment testers 3, 4,
Since the lock cylinders 39 of Nos. 5 and 6 are locked, the base plate 38 is fixed to the turntable 35, and the lock cylinders 21 are released from the lock operation. It is placed integrally with the turntable 35 so as to be movable in the left-right direction, and is normally pushed by the cylinder 108 to be urged toward each other inward.

Therefore, when the vehicle under test moves on the mounting plates 24 and 25 in such a state, the wheels are on both sides of the roller 2.
6 and the movement direction is regulated by contacting 6 and the roller 26
By the abutting force acting on the mounting plates 24 and 25, the mounting plates 24 and 25 move in the left-right direction along the guide rails 16 and 17, and this is adjusted to have the same width as the distance between the left and right wheels.

In this way, the test vehicle is stopped when the front and rear wheels ride on the rollers 9, 9 of the alignment testers 3, 4, 5, 6. After this, the lock cylinder 21
Is locked to fix the gantry 20 to the machine frames 7 and 8, and the lock operation of the lock cylinder 39 is released to place the base plate 38 in the front-back direction.

Under these circumstances, the cylinders 84, 8
For example, when 5 is retracted, the overhanging piece 87 is pulled by the piston rod 86 and the swing link 88 is moved to the pin 89.
9 is rotated counterclockwise in FIG. 9 to move the links 91 and 92 connected to both ends thereof to the outside.

The links 91 and 92 are displaced by displacing one end of a swing lever 93 connected to the ends thereof in the same direction and rotating the lever 93 counterclockwise in FIG. , The swing arm 95 pivotally attached to the other end is pushed inward.

Therefore, the guide rod 98 integral with the sensor frame 97 to which the swing arm 95 is fixed is pulled and moved, and the rod 98 is guided by the linear ball bearing 99 to move leftward in FIG. 97
And the overhanging piece 101 fixed to the frame 97 project in the same direction, and the roller 102 provided at the tip of the overhanging piece 101.
Touches the side of the wheel of the vehicle under test lightly.

After this, each alignment tester 3, 4,
The motors 43 mounted on the motors 5 and 6 are driven, and the driving force thereof is transmitted to the rollers 9 and 9 through the sprockets 44 and 42 and the chain 45 to rotate the rollers 9 and 9 in synchronization. In this case, the rollers 9 and 9 are rotated at a vehicle speed equivalent speed much higher than the conventional one, that is, a constant speed of 14 km / h in the embodiment.

When the rollers 9 and 9 rotate at high speed in this way, the wheels riding on them rotate at high speed, and the behavior based on the alignment state after the wheels are assembled, that is, the toe state in the embodiment, is remarkable. That is, when the toe value exceeds the acceptable range, the wheels move axially on the rollers 9, 9, and when the toe value is within the acceptable range,
The wheels continue to rotate while maintaining the original riding position on the rollers 9, 9. Therefore, it is possible to determine the straight running performance or the traveling direction due to the toe based on the behavior of the wheels.

Then, as described above, the wheels are connected to the rollers 9,9.
When it moves upward in the axial direction, it abuts on the roller 102 located in the moving direction, and the overhanging piece 101 to which the roller 102 is attached is pushed by a small amount, and the abutting piece fixed to the other end of the piece 101. 103 contacts the load cell 104. The load cell 104 outputs a signal corresponding to the abutting force, and outputs the signal via the first arithmetic unit 105 to the second arithmetic unit 106.
To enter.

The second calculator 106 judges whether the load cell input is acceptable or not, and when the input is a certain value or more, it is judged as unacceptable, and the signal is input to the drive circuit of the motor 43, and the motor 43 is inputted. If the load cell input is equal to or less than a certain value, it is determined to be acceptable, and the toe adjustment value correction amount is calculated based on each load cell input as described later. Therefore, it is possible to prevent abnormal behavior of the test vehicle at the time of the test, drop out of the test device, and damage or failure of the test device.

In this case, as described above, the wheels are the rollers 9,
9 moves outward in the direction of 9 and abuts against the roller 102 to prevent movement in the same direction. On the contrary, when moved inward, abuts against the guide roller 48 to prevent movement in the same direction. , Combined with the above, the safety of the test can be secured.

On the other hand, when the motors 60 of the alignment testers 3, 4, 5 and 6 are driven before and after the driving of the rollers 9 and 9, the screw shaft 58 rotates and slides screwed onto the shaft 58. The guide 55 moves in the axial direction, and the first movable table 56, which fixes the guide 55, moves inward from the original position along the rail 54.

In this case, ultrasonic waves are radiated from the respective sensors 50 of the sensor unit 10 toward the opposite wheels,
The drive of the motor 60 is stopped when the alignment testers 3, 4, 5 and 6 have moved to the fixed positions lateral to the wheels.

At the same time, when the motor 65 is driven based on the size input of the test vehicle, a drive gear (not shown) rotates and a rack (not shown) meshing with the gear moves to fix the rack. The second movable table 64 moves along the rail 62 in the direction orthogonal to the first table 56.

In this way, each alignment tester 3, 4,
After the wheels 5 and 6 face each other at a predetermined position on the side of the wheel, the motor 8
When 0 is driven for a predetermined time, the power is transmitted to the ball screw 73 via the gears 79 and 78, and the gear box 7
It is transmitted to the ball screws 71, 72 via 5 and these ball screws 71, 72, 73 rotate synchronously.

Therefore, each ball screw 71, 72, 73
The sensor holder 81 screwed in the same position moves in the axial direction by the same amount, and the other sensor holder 83 moves together with the sensor holder 81 and slides on the guide rod 82. Therefore, each sensor 50 moves on the side surface of the wheel all at once in the radial direction, at that time, counts the distance between the sensor 50 and the wheel innumerably, inputs those measured values to the first arithmetic unit 105, and The distance signal is input to the second calculator 106 every second. At the same time, the XY position on the plane of each alignment tester 3, 4, 5, 6 is measured by a potentiometer (not shown), and the information thereof is input to the second computing unit 106.

The second calculator 106 calculates the center position of each wheel, the XY position on the plane of the center position, the toe value of each wheel, and the toe adjustment value based on the toe value, based on the above input. Further, the virtual center of the test vehicle obtained by connecting the center positions of the wheels is calculated, and the toe adjustment value of each wheel is calculated based on the center, and this is corrected.

The second calculator 106 further calculates the toe adjustment value by adding the input value of each load cell 104 to the corrected toe adjustment value and corrects it. As a correction method in this case, for example, the toe adjustment value of each wheel is calculated and corrected according to the output value of the load cell 104 or the ratio thereof, or the output difference of the load cell 104 of each left and right wheel is calculated, and the The toe adjustment value of the wheel with the larger output of the load cell 104 is calculated and corrected according to the difference, or the toe adjustment value of each wheel is calculated according to the output value of the load cell 104 for the wheel corresponding to the failed toe value. And correct it.

The toe adjustment value data of each wheel thus corrected is input from the second computing unit 106 to the display unit 107,
It is displayed on the CRT of the display 107. The operator is the display 1
Based on the toe adjustment value displayed on 07, the motor 43 is temporarily stopped to adjust the required position of the test vehicle, the motor 43 is driven again after the adjustment, the toe of each wheel is measured, and the pass or fail is confirmed. To do.

As described above, according to the present invention, by rotating the rollers 9 and 9 at a high speed corresponding to the vehicle speed and rotating the wheels at a high speed, the behavior based on the alignment state is reproduced on the rollers 9 and 9.
By adding information on the behavior, in other words, straight running performance or traveling direction data based on the toe of the test vehicle to the calculation data, compared to the conventional toe adjustment value calculated based only on the toe value, A toe adjustment value that is more suitable for running is obtained.

As described above, the method of calculating the toe adjustment value in the wheel alignment of the present invention rotates the roller at a high speed corresponding to the vehicle speed so that the wheels on the roller can move in the axial direction based on the alignment state. The moving amount of the wheel or the pressing force or tension corresponding to the moving amount is measured, the measured value is input to the calculator to calculate the traveling direction of the test vehicle on the roller, and the data of the traveling direction is calculated. By adding the adjustment value to the calculated data, the conventional toe adjustment value based on the toe value can be corrected, and the toe adjustment value more suitable for actual traveling can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a measurement situation in which the present invention is used, and additionally includes a plan view of a measuring apparatus in which the present invention can be implemented.

FIG. 2 is a view taken along the line AA of FIG.

FIG. 3 is a front view of FIG. 1 viewed from the direction of arrow B.

FIG. 4 is a plan view showing a wheel mounting portion of a measuring device capable of implementing the present invention.

5 is a cross-sectional view taken along the line CC of FIG.

FIG. 6 is a right side view of FIG. 4 showing a part of the cross section.

FIG. 7 is a plan view showing a wheel contact portion of a measuring device capable of implementing the present invention.

FIG. 8 is a partial cross-sectional view of the front view of FIG.

FIG. 9 is a plan view showing, in an enlarged manner, a main part of a wheel contact portion drive mechanism of a measuring device capable of implementing the present invention.

FIG. 10 is a front view showing a main part of the wheel contact portion drive mechanism.

FIG. 11 is a front view showing a sensor unit of a measuring apparatus capable of implementing the present invention.

FIG. 12 is a right side view of FIG. 11.

[Explanation of symbols]

 3, 4, 5, 6 Alignment tester 9 Roller 50 Distance sensor 106 Computing unit

Claims (1)

[Claims] 1. A roller for mounting and rotating a wheel of a vehicle under test, an alignment tester equipped with a plurality of distance sensors facing the wheel and capable of measuring at least a toe, and at least a toe based on distance information from the alignment tester. In a method of calculating a toe adjustment value in wheel alignment, which comprises a calculator capable of calculating a value and a toe adjustment value, the roller is rotated at a high speed corresponding to the vehicle speed, and the wheel on the roller is rotated based on the alignment state. Direction, the moving amount of the wheel or the pressing force or tension corresponding to the moving amount is measured, and the measured value is input to the calculator to calculate the traveling direction of the test vehicle on the roller, In the wheel alignment, the toe adjustment value is calculated based on the direction data and the toe adjustment value based on the toe value. Toe adjustment value calculation method.