JPH02201212A - Wheel alignment measuring apparatus for vehicle - Google Patents

Abstract

PURPOSE:To perform highly accurate wheel alignment measurement by detecting an inclination in a horizontal plane of a center axis extending longitudinally of a vehicle when an alignment of a wheel is measured, and correcting a actually measured alignment value of the wheel by the inclination detected of the center axis of the vehicle. CONSTITUTION:Wheels 12 are placed on respective wheel receiving means 14 and while the wheels 12 are stopped, an inclination of a center axis 10a of a vehicle 10 is determined by inclination detecting means 16 and 18. Then, an alignment of the wheels 12 is measured by wheel alignment measuring means 60 and 160 rotating the wheels 12 and at the same time, an inclination of the vehicle 10 is detected by the inclination detecting means 16 and 18 during the rotation of the wheels 12. Then, an actually measured value obtained by the vehicle alignment measuring means 60 and 160 is corrected based on a change portion of inclination of the vehicle 10 during the rotation of the wheels. Thus, a highly accurate measurement of wheel alignment is accomplished to meet an actual running condition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle wheel alignment measuring device that measures the alignment of wheels while rotating them.

(Prior art) As a device for measuring alignment such as wheel toe angle,
Conventionally, as described in, for example, Japanese Unexamined Patent Publication No. 02-175607, an apparatus has been proposed that measures the alignment of a wheel while rotating the wheel.

When a wheel rotates on a road surface, the wheel generates side thrust force such as LF (lateral force) in the direction of the wheel rotation axis due to wheel manufacturing errors (variations in tire belt width, tread gauge, etc.) at its grounding point. receive. Therefore, with the device that measures the alignment of the wheel while rotating the wheel, more practical wheel alignment data can be obtained that takes into account changes in the wheel posture due to the LF etc. that occur when the vehicle is actually running. be able to.

Such a device is configured to receive a wheel on a wheel receiver and measure the alignment of the wheel while rotating the wheel on the wheel receiver, and conventionally, it has generally been configured using a roller type wheel receiver, e.g. As shown in FIG. 13 (side view) and FIG. 14 (plan view), two rollers 2 support the wheel 4, and at least one of the rollers 2 is driven to rotate.
A configuration that rotates the is adopted.

(Problem to be Solved by the Invention) However, when the wheel receiving means is composed of the two rollers 2 described above, when the wheel 4 rotates, the roller 2 causes the wheel 4 to
A force acts to make the (wheel center line 4a) perpendicular to the roller axis 2a, and since the steering wheel is fixed during alignment measurement, the wheel cannot tilt by itself (tilt change width Therefore, the vehicle tilts due to the force acting on each wheel that tries to make the wheels perpendicular to the roller axis 2a, and as a result, the measurement data of wheel alignment also reflects the tilt of the vehicle. This poses a problem in that it is difficult to perform highly accurate wheel alignment measurements under conditions that faithfully reproduce actual driving conditions. Note that this problem also exists when a relatively large roller receives a wheel and rotates the wheel by rotationally driving the roller.

In view of the above-mentioned circumstances, it is an object of the present invention to eliminate measurement errors caused by the tilt of the vehicle even if the vehicle tilts due to the force that tries to make the wheels perpendicular to the rollers, thereby improving the accuracy of actual driving. An object of the present invention is to provide a vehicle wheel alignment measuring device capable of performing highly accurate measurements that faithfully reproduce conditions.

(Means for Solving the Problems) A vehicle wheel alignment measuring device according to the present invention includes:
In order to achieve the above object, there is provided a wheel alignment measuring device for a vehicle which is equipped with a wheel receiving means for receiving a wheel and measures the alignment of the wheel while rotating the wheel on the wheel receiving means, when measuring the alignment of the wheel. comprising a tilt detection means for detecting a tilt in a horizontal plane of a central axis extending in the longitudinal direction of the vehicle, and configured to correct the measured wheel alignment value based on the tilt of the central axis of the vehicle detected by the tilt detecting means. It is characterized by what it did.

The inclination of the central axis of the vehicle in a horizontal plane is defined as the inclination of the central axis of the vehicle in the horizontal plane, assuming that the vehicle is located on a horizontal plane when each wheel is positioned on the wheel support means, That is, it means an inclination in the vehicle width direction.

(Function) According to the vehicle wheel alignment measuring device described above, since the inclination detection means for detecting the inclination in the horizontal plane of the central axis extending in the longitudinal direction of the vehicle is provided, the inclination detection means detects the inclination of the central axis extending in the longitudinal direction of the vehicle. (during alignment measurement)
For example, when the vehicle is first placed on a wheel alignment measuring device (each wheel is placed on the wheel receiving means) and the wheels are stopped there, the inclination of the vehicle's central axis is determined. Then, when measuring wheel alignment by fixing the steering wheel and rotating the wheel, determine the inclination of the vehicle's central axis.
By subtracting the former from the latter, it is possible to detect the change in the vehicle's inclination when the wheels rotate, and as a result, by correcting the actual measurement value 14 of the wheel alignment based on the change in the inclination of the vehicle, it is possible to detect the change in the inclination of the vehicle. It is possible to perform highly accurate wheel alignment measurements that do not include errors and are consistent with actual driving conditions.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic plan view showing an embodiment of a vehicle wheel alignment measuring device according to the present invention.

The wheel alignment measuring device 40 according to this embodiment is equipped with a wheel receiving means 14 each consisting of a pair of rollers that receives each wheel (front wheel and rear wheel) 12 of a vehicle IO carried onto the device 40. The receiving means 14 is configured to rotate the wheel 12 received by driving one of the rollers, and wheel alignment measuring means 60, 160 are disposed beside each wheel receiving means 14, The measuring means 60 and 160 each bring the measuring plates 81 and 161 into contact with the outer surface of each wheel 12 with an appropriate biasing force to make the measuring plates 61 and 161 follow the change in the attitude of the wheel 12. The alignment of each wheel 12 can be measured by detecting the inclination of .161, and each wheel alignment measuring means 80,1
60 indicates the inclination of the vehicle lO in the horizontal plane, that is, the vehicle 1
An optical distance sensor is provided that constitutes a tilt detection means 16 for detecting the tilt of the central axis 10a extending in the front-rear direction of the vehicle in the direction of arrow G in FIG. According to the optical distance sensor IB, each optical distance sensor 16 first detects A and B of the vehicle.

The positions of points C and D are determined, and the data is input to the calculating means 18, which calculates the midpoint E from the positions A and B, and the midpoint F from the positions C and D, and calculates the midpoint between them. The line connecting E and F is the central axis 10a of the vehicle,
The inclination of the central axis 10a, that is, the inclination of the vehicle 1O, can be determined from the difference in the vehicle width direction and the difference in the longitudinal direction between the rain points E and F. Note that the positions of the above points A, B, C, and D are determined by, for example, each wheel alignment measuring means (10, 1
60 in the horizontal plane, and then the position of each optical distance sensor 16 can also be determined, and each sensor 16 emits light in the vehicle width direction toward the vehicle 10, and the light is emitted from the vehicle 10. Each sensor 1 receives the reflected light and calculates the time from the emission of the light to the reception of the reflected light.
It can be determined by adding the distance from 0 in the vehicle width direction to the position of each sensor 10 described above.

Wheel alignment measurement using the apparatus configured as described above is carried out as follows.

First, the vehicle 10 is carried onto the wheel alignment measuring device 40 as shown in the figure, and each wheel 12 is positioned on each wheel receiving means 14. In this state, each wheel alignment measuring means 60, 180 is moved forward toward the vehicle side in the vehicle width direction, and each measuring plate 81, 161 is applied to each wheel 12 with a predetermined biasing force.
The inclination of the vehicle 10 in the initial state when the vehicle 10 is brought in and the wheels are stopped is determined by each of the optical distance sensors 1B and the calculation means 18. Next, while rotating each wheel 12 by rotating the rollers of the wheel receiving means 14, wheel alignment is measured by the wheel alignment measuring means 60, 160, and at the same time the vehicle lO during wheel rotation (wheel alignment measurement). is detected by the optical distance sensor 1B and the calculation means 18. Then, the vehicle alignment measuring means 60.1 is based on the value obtained by subtracting the vehicle tilt when the wheels first stop from the tilt of the vehicle when the wheels are rotating, that is, the change in the tilt of the vehicle when the wheels are rotating.
The wheel alignment is determined by correcting the actual measured value according to 60. Such corrections are made to eliminate errors in wheel alignment measurement values due to changes in vehicle inclination, and for example, corrections that indicate the relationship between the true alignment value, actual alignment measurement value, and vehicle inclination variation value. It is sufficient to prepare formulas and correction maps in advance and perform corrections using them.

Hereinafter, the above embodiment will be explained in more detail with reference to FIGS. 2 to 12. However, in these drawings, the optical distance sensor 1B and the calculation means 1B, which are the above-mentioned inclination detection means, are omitted.

FIG. 2 is a detailed plan view showing an embodiment of the wheel alignment measuring device 40. This device 40 includes a front wheel tester 41 that performs the alignment n1 of the front wheels, and a front wheel that guides the left and right front wheels to the front wheel tester 41. A guide 43, a rear wheel tester 45 for measuring rear wheel alignment, and a rear wheel guide 47 for guiding the left and right rear wheels to the rear wheel tester 45 are arranged in a line as shown in the figure. Ori,
The vehicle is transported in the direction of arrow A, and the front and rear wheels are guided by front and rear wheel guides 43.47, respectively, and positioned above the front and rear wheel testers 41.45.

FIG. 3 is a front view showing the front wheel tester 41 in detail along arrows ■--■, and FIG. 4 is a detailed plan view of this tester 41. As can be seen from the figure, this tester 41 has left and right (
The tester consists of a right tester section and a left tester section having the same configuration and arranged symmetrically in the vehicle width direction, so the same functional parts are given the same numbers and only one tester section will be explained.

The front wheel tester 41 includes a full-float turntable assembly 50 that is mounted on a support stand 41a and supports the front wheels so that they can be steered and moved left and right and back and forth, and a turntable assembly 5G that is placed on the turntable assembly 5G. a front wheel alignment measuring means 60 that measures the toe angle, camber angle, etc. of the front wheel by coming into contact with the outer surface of the front wheel; It is composed of a moving means 70. The front wheel alignment measuring means 60 has a measuring plate 61 that contacts the outer surface of the front wheel, and the measuring plate B1 is brought into contact with the outer surface of the front wheel placed on the turntable assembly 50 by movement by the moving means 70. At the same time, the inclination of this measuring plate fil is fixed at Al1 to measure the toe angle, camber angle, etc.

Here, the turntable assembly 50 is shown as v-v in FIG.
The structure of the turntable assembly 50 will be described in detail with reference to FIG. 5, which is a line sectional view, and FIG. 6, which is a side view. This turntable assembly 50 has a frame 51 made up of a plurality of members fixed to a support base 41a, and a plurality of bearings 52 are fixedly arranged on the upper surface of this frame 51 in line on the same circumference. The bearing 52 has a rotatable ball 52a, and the turntable 53 is supported by the ball 52a so as to be rotatable and movable back and forth and left and right. On this turntable 53, the above-mentioned wheel receiving means 14 is arranged. That is, the two rollers 14 are rotatably supported by brackets (not shown) fixed to the turntable 53, and one roller 14 is rotated by a drive means such as a motor (not shown) provided on the turntable 13. It has been made possible. Further, this turntable 53 is provided with left and right guide plates 53b that come into contact with the inner surface of the front wheel 12 to position the front wheel in the width (left and right) direction. Of course, the turntable 53 can also be appropriately provided with a front-rear guide (not shown) for positioning the front wheel 12 in the front-rear direction. Furthermore, a rotary shaft 54 extending downward from the center is attached to the turntable 53, and an encoder 55 for detecting the rotation angle of the turntable 53 is attached to the lower end of the rotary shaft 54. The above frame 51
Transport plates 51a and 51b are attached to sandwich the turntable 53 at the front and rear for smoothly transporting the front wheels to the turntable 53. Furthermore, shaft holding plates 58.56 are disposed on the frame 51 so as to sandwich the rotating shaft 54 in the front and rear directions, and are movable back and forth. The upper ends of arms 58 are respectively connected to the upper ends of arms 58 rotatably attached to the upper ends of the arms 58. The lower end 58c of the arm 58 is connected to both ends of the cylinder 59, and as the cylinder 59 expands and contracts, the arm 58 is rotated and the shaft holding plate 5B is moved back and forth, so that when the cylinder 59 is extended, The two wheel retaining plates 58, 56 approach each other when they are retracted, and move away from each other when they are retracted.

These two shaft holding plates 58, 56 and the rotating shaft 54 are indicated by the arrow V
FIG. 5A is a cross-sectional view taken along the line a-Va, and as can be seen from this figure, right triangular notches 5Ba are provided at the mutually opposing ends of the shaft holding plates 56 and 58. A portion 54 of the rotating shaft 54 facing this notch 58a
A has a square cross section matching the above-mentioned notch. Therefore, when the cylinder 59 is extended and the shaft holding plates 5B, 58 approach each other, the notches 58a, 58a clamp the square portion 54a and hold the rotating shaft 54 fixedly. Therefore, in the above state, the turntable 53 is also fixedly held with the wheel receiving means 14 facing forward and backward.

Next, the structures of the front wheel alignment measuring means 60 and the moving means 70 will be explained using FIGS. 7 to 9.

The front wheel alignment measuring means 60 extends on the frame 65 in the vehicle width direction (the left-right direction in FIGS. 7 and 8) and is attached to a support shaft 62.
is attached, and a measurement plate 81 is rotatably attached to the center end of the support shaft 62 in the vehicle width direction via a ball joint 62a. The measurement plate 61 includes a substrate 61b and a substrate 81 rotatably attached to the support shaft B2 via the ball joint 62a.
Three rotatable rollers 61c provided at the outer edge of b
The roller 81c is a wheel 12 as shown in FIG.
is brought into contact with the side of the The measuring plate 61 is rotatable around the ball joint 82a, but the frame 6
5, compression spring 63a1 tension spring 6
3b and link 63c, it is held vertically as shown in the figure. Note that the measuring plate 81 is held in an upright state when no external force acts on the measuring plate 81. When the measuring plate 61 receives an external force, the measuring plate 61 is held in an upright state due to the deflection of the springs 83a and 83b and the deformation of the link 83e. The measuring plate 61 is connected to the ball joint 82a according to the external force.
It is rotated around. For this reason, when the measuring plate 61 is brought into contact with the outer surface of the front wheel, this measuring plate 61 is tilted according to the inclination of the front wheel, so if the inclination of this measuring plate is measured,
It is possible to measure the toe angle, camber angle, etc. of the front wheel. In order to measure the inclination angle of this measuring plate 61, three displacement measuring devices 64 are attached to the frame 65. The displacement i9j determiner 64 has a probe 64a that protrudes toward the center in the vehicle width direction and is movable in the vehicle width direction.
As shown in the figure, the ball joint [12a is attached to the front, rear (left and right in the figure) and above.

This probe 84a comes into contact with contact dust 61a fixed to the measuring plate 61 when the measuring plate 61 comes into contact with the outer surface of the front wheel, and when the measuring plate B1 is inclined, Since there is a difference in the amount of movement of each probe 64a in the vehicle width direction (the amount of movement in the vehicle width direction within the displacement measuring device 64), the toe angle, camber angle, etc. can be detected from this difference. Specifically, the toe angle can be measured from the difference in the amount of movement in the vehicle width direction of the probe 64a of the displacement measuring device B4 placed before and after the ball joint 132a, and the average value of both of the above amounts of movement and the ball The camber angle can be measured from the amount of movement of the displacement measuring device 64 placed above the joint 62a. If only the toe angle is to be measured, only two displacement measuring instruments 64 placed before and after the ball joint 62a may be used. Note that these displacement measuring devices 64 and the like are covered by a cover (ioa) as shown by the two-dot chain line in FIG.

The front wheel alignment measuring means 60 configured as described above is a frame 6.
5, it is supported movably in the vehicle width direction by a moving means 70, and the structure of this moving means 70 and how it supports the front wheel alignment n1 constant means 60 will be explained. The moving means 70 has a frame 71 fixedly installed on the support base 41a, and the frame 71 allows a pair of front and rear guide rods 72.72 extending in the vehicle width direction and movement between these guide rods 72.72 in the vehicle width direction. An extending transport rod 74 is supported. Each guide rod 72
Two guide legs 67 and 67 fixed to the lower surface of the frame 65 of the front wheel alignment measuring means 60 are slidably fitted on the top, respectively, so that the front wheel alignment measuring means 60 can be moved by the moving means 70. It is supported so that it can move freely in the vehicle width direction. Furthermore, a thread is formed on the outer periphery of the transport rod 74, and the front wheel alignment measuring means 60
A threaded bush 66a of a transport leg 66 fixed to the lower surface of the frame B5 is threadedly engaged with the transport rod 74. The transport rod 74 is rotatably supported by the frame 71, and a first sprocket 75a attached to its end meshes with a second sprocket 75c attached to the shaft of a servo motor 76 via a chain 75b. By rotationally driving the servo motor 7B to rotate the transport rod 74, the entire front wheel alignment measuring means BO can be moved in the vehicle width direction via the transport legs 6B.

During actual measurement, the front wheel alignment all determining means 60 is moved forward toward the front wheel 12 by the servo motor 7B, and after the measuring plate 61 comes into contact with the outer surface of the front wheel, it is further moved forward by a predetermined amount. After the D1 constant plate 61 is pressed against the outer surface of the front wheel by a predetermined biasing force via the compression spring 63a, it is stopped.

This is to ensure that even when the front wheel moves away from the measuring plate 61, the measuring plate 61 is brought into contact with the outer surface of the front wheel, so that it can accurately follow changes in the posture of the front wheel. For this reason, although not shown, the front wheel alignment measuring means 60 is provided with a phototube limit switch, so that the front wheel alignment measuring means 60 moves forward and the measuring plate 81
After the support shaft 62 comes into contact with the outer surface of the front wheel, the support shaft 62 stops, and from then on, the front wheel alignment measuring means BO
moves forward, the compression spring Baa is compressed, and only the frame 65 and the members fixed thereto move forward, so that the frame 65 moves relative to the support shaft 62. It is configured to detect that the relative movement between the two has reached a predetermined amount, and thereby stop the servo motor 7B.

Incidentally, since the forward movement of the front wheel alignment measuring means 60 is performed as described above, the final position of the support shaft 62 can be known by detecting the amount of rotation of the servo motor 7B, for example. The inclination of the vehicle can be detected based on the amount of rotation of the servo motor 7B when the vehicle is brought into the vehicle and its wheels are kept stationary.

Moreover, the optical distance sensor 16 as the above-mentioned inclination detection means is
Although not shown, it may be provided, for example, at a predetermined position of the frame 65 so as to be able to emit light toward the vehicle side in the vehicle width direction. Of course, this optical distance sensor 16 may be provided anywhere as long as its position is known in advance, for example, it may be provided on the frame 71 of the moving means.

Although the front wheel tester 41 has been described above, the rear wheel tester 45 will now be described. Similar to the front wheel tester 41, the rear wheel tester 45 also consists of a pair of left and right tester sections, and each tester section is connected to a full-float type turntable assembly 1.
50, rear wheel alignment measuring means 180, and moving means 170.

As shown in FIG. 10, the turntable assembly 150 includes a frame 151, a plurality of bearings (not shown) attached to the frame 151, and a turntable supported by the bearings so as to be rotatable and movable back and forth and left and right. A table 153 and a turntable 153 arranged on the turntable 153
It has a wheel receiving means 14 made of a book roller and a driving means (not shown) for rotating one of the rollers 14, and these have a slightly different shape from the turntable assembly 50 for the front wheels, but their functions and Since the essential structures are the same, their explanation will be omitted. The rotating shaft 154 extending downward from the turntable 153 has a smaller downward extension than the rotating shaft 54 of the front wheel table 53, and only has a square cross section 154a at its lower end. No encoder is installed to detect rotation. A pair of shaft holding plates 15 are arranged to sandwich the square cross section 154a at the lower end of the rotating shaft 154 in the front and rear.
8.156 is arranged, both wheel holding plates 158.158
are normally pushed and expanded by a spring 157, but each cylinder 158, 158 arranged at the front and rear
The rotating shaft 154 is held fixed by the square cross section 154a being held between the two wheel holding plates 158, 158.

Rear wheel alignment measuring means 180 for measuring the toe angle, camber angle, etc. of the rear wheels, and the rear wheel alignment measuring means 16
A phototube limit switch and an optical distance sensor provided at 0 and rear wheel alignment measuring means 160
The moving means 170 for moving the vehicle in the vehicle width direction (horizontal direction) has the same function and essential structure as the front wheel tester 41, so a description thereof will be omitted. Next, a description will be given of the front wheel guide 43 and rear wheel guide 47 that guide the front wheels and rear wheels to the front wheel tester 41 and the rear wheel tester 45, respectively. Since both guides 43 and 47 have the same shape, the 11th guide
The front wheel guide 43 is shown in the figure and will be explained based on this. This front wheel guide 43 connects the left and right front wheels to the front wheel tester 4 respectively.
The vehicle has a pair of guide bodies 90.90 having guide grooves 90a for guiding the vehicle toward the vehicle 1, and these guide bodies 90.90 are movable in the vehicle width direction (horizontal direction). Also,
In order to correctly guide the front wheel into the guide groove 90a, a guide plate 91.91 that opens rearward in a "C" shape is attached. Frames 98.97 face the outer surfaces of both guide bodies 90.90. There is a rotatable first part extending to the right in the figure.
An arm 92a and a second arm 92b are attached, and both arms 92a, 92b are connected by a first connecting rod 93. Further, as shown in the figure, the first arm 92a is connected to the guide body 90 that supports the right front wheel by a second connecting rod 95, and the second arm 92b is connected to the frame 97 facing the outer surface of the guide body 90 that supports the left front wheel. The third arm 92e extending forward (to the left in the figure) from the
is rotatably attached integrally with the second arm 92b, and the third arm 92c is connected to a guide body 90 supporting the left front wheel by a third connecting rod 94, as shown.

For this reason, the first connecting rod 93 is connected to a cylinder (not shown).
If you move it in the vehicle width direction by etc., both guide bodies 90.9
0 can be moved in opposite directions in the vehicle width direction, thereby making it possible to adjust the distance between the guide bodies 90 and 90 in accordance with the treads of the front wheels, even if the treads of the front wheels are different.

Further, lids 48 and 49 for lifting and supporting the vehicle body are provided before and after the front wheel guide 43 (see FIG. 2). As shown in FIG. 12, which shows a cross section taken along the arrow xn-xn in FIG. The rod 101 can freely protrude upward, and the head 1 has a groove 101b at its upper end.
ola is installed.

Therefore, when the rod 101 of the cylinder 102 is extended upward, the groove 101b of the head 101a receives the side sill of the vehicle body and lifts the vehicle body. When the front and rear wheels are placed on full-float turntable assemblies, if an external force is applied to the car body in the horizontal direction, the turntables will move and the car body will move, causing inaccurate measurements by the front and rear wheel testers. However, by lifting and supporting the vehicle body using the lifter, it is possible to prevent the vehicle body from being moved even when a horizontal external force is applied to the vehicle body. Furthermore, by lifting the vehicle body with the lifter, the weight of the vehicle applied to the tire placed on the wheel receiving means I4 can be reduced, thereby reducing the deformation of the tire, and the turntable 53. By reducing the load on the turntable 53.153, the turntable 53.153 can be rotated smoothly. However, even if the vehicle body is supported by the lifter mentioned above, it is difficult to completely prevent the vehicle body from moving.
! 4 (the width of the groove 101b is set larger than the width of the side sill, and there is play between the two), and therefore the vehicle tilts as described above when the wheels rotate.

A method of measuring vehicle wheel alignment using the measuring device 40 as described above will be described. First, the cylinders 59, 158, 158 of the front wheel turntable assembly 50 and the rear wheel turntable assembly 150 are extended, and the rotating shaft 54.154 is fixedly held by the shaft holding plates 58.58 and 158.158. , the vehicle is transferred onto this device 40 from the right side of the drawing in FIG. The steering wheel is placed on the means 14 and the steering wheel is fixed at zero steering angle (straight ahead direction). Next, lifter 4
8. Move the head 101a of 49 upward and move this head 101
a lifts the side sill portion of the vehicle body to reduce the load from the front and rear wheels to the turntable assembly 50°150, and also holds the vehicle body to prevent horizontal movement of the vehicle body due to external force. The lifting force of the vehicle body by the lids 48 and 49 is set so that the rotation of the rollers 14 leaves enough load on the rollers 14 to properly rotate the wheels. Next, the servo motor 7B is rotated to adjust the wheel alignment measurement means eo and tea to each wheel 121.
; The measurement plate 81.1 is moved forward in the vehicle width direction toward the target and stopped at a predetermined position, thereby applying a predetermined pressing force to the measuring plate 81.1.
81 is brought into contact with the outer surface of each wheel 12. Under this condition, the servo motor 7B or the optical distance sensor IG and the calculating means 18 detect the inclination of the vehicle when the vehicle is first brought in and the wheels are still stopped. Thereafter, the rollers 14 of each wheel receiving means are rotated to rotate the wheels 12, and the alignment of the wheels under the wheel rotation state is measured by measuring the inclination angles of the measurement plates at and tet. The inclination of the vehicle while the wheels are rotating is detected by the optical distance sensor l (i) and the calculation means 18. Then, using the method described above, the actual measured values of the wheel alignment (toe angle, camber angle, etc.) are determined based on the inclination of the vehicle. to correct.

In addition, after completing the above wheel alignment measurement,
For example, the corrected measured value is compared with a reference value prepared in advance, and if the two are different, each cylinder 59.158.15 of both turntable assemblies 50, 150 is
8 to shrink the shaft holding plates 58.56 and 158.15.
Release the fixed holding state of the rotating shaft 54.154 by 6,
Alignment adjustment of the wheels 12 is performed with the turntable 53.153 in a full float state.

In the above embodiment, the measuring plates 81 and 181 are attached to the outer surface of the wheel 12.
Contact type wheel alignment measurement is used to determine the toe angle, camber angle, etc. from the inclination angle of the 7111 fixed plates 61, 181. It is also possible to employ non-contact wheel alignment measurement to determine toe angle, camber angle, etc.

Furthermore, in the above embodiment, the wheel alignment was measured with the turntables 53, 151 fixed.
The wheel alignment measurement may be performed with the turntable 53.153 in a full float state. In addition, the turntable 53, 153 is attached to the frame 51.151.
Appropriate clamping means (not shown) is provided for fixing and unfixing the turntable 53.153 during wheel alignment measurement.
It may be fixed.

Of course, the wheel receiving means 14 for receiving the wheel 12 may be composed of something other than rollers.

(Effects of the Invention) As described above, the wheel alignment measuring device according to the present invention is provided with a tilt detection sensor that detects the tilt of the vehicle. It is possible to detect the inclination and apply corrections based on the vehicle inclination to the actual measured value of wheel alignment. By doing so, it is possible to obtain accurate values that do not include errors due to vehicle inclination and are in line with the actual driving conditions. It is possible to perform high wheel alignment measurements.

[Brief explanation of the drawing]

1 is a schematic plan view of an embodiment according to the present invention, FIG. 2 is a detailed plan view of the embodiment shown in FIG. 1, FIGS. 3 and 4 are a front view and a plan view of a front wheel tester, 6 are a front sectional view (sectional view taken along the line v-V in FIG. 4) and a side view showing the turntable assembly for the front wheels. FIG. 5A is a sectional view taken along the line Va-Va in FIG. Figures 7 to 9 are front views, plan views, and side views showing the front wheel alignment measuring means and moving means, Figure 1O is a front view showing the turntable assembly for the rear wheels, and Figure 11 is the front wheel guide. FIG. 12 is a sectional view showing a beam cover, and FIGS. 13 and 14 are a side view and a plan view showing a 20-L type wheel receiving means. IO...Vehicle 10a...Vehicle center axis 1
2...Wheel 14...Wheel receiving means 18.
18...Tilt detection means Figure 2C

Claims (1)

[Scope of Claims] A wheel alignment measuring device for a vehicle, comprising a wheel receiving means for receiving a wheel, and measuring the alignment of the wheel while rotating the wheel on the wheel receiving means, wherein the vehicle is The vehicle is provided with an inclination detecting means for detecting an inclination in a horizontal plane of a central axis extending in the longitudinal direction of the vehicle, and is configured to correct the measured value of the alignment of the wheel based on the inclination of the central axis of the vehicle detected by the inclination detecting means. A vehicle wheel alignment measuring device characterized by: