Method of and device for optical scanning of vehicle wheel

FIELD: transport engineering.

SUBSTANCE: according to proposed method, wheel section is being scanned by means of light beam radiated by light source 6, and reflected light beam is detected by receiver 7 sensitive to change of position. Distance from section under scanning to initial point is measured account of directions of radiated and reflected beams. Receiver 7 sensitive to change of position is turned synchronously with light source 6 by means of turning device around common axle 4 to provide successive measurements.

EFFECT: facilitated recording of complex characteristics of wheel rim contour.

15 cl, 4 dwg

 

The technical field

The invention relates to a method of optical scanning wheel vehicle according to the restrictive part of paragraph 1 of the claims and device for its implementation in accordance with the restrictive part of paragraph 10 of the claims.

Prior art

In the method and the device according to WO 98/10261, the light beam emitted by the light source, is made in the form of a source of laser beams is directed to the area located near fixed to the inner side of the rim of the counterweight. The beam reflected from the scanned area, is made sensitive to the change of position of the unloading device and method triangulation is determined by the position of the scanned area and attached to the rim of contrast control. The light source and sensitive to changes in position of the receiving device is placed on a common rack, which can be rotated manually so that the emitted light beam can be directed to the desired area on which the counterweight is attached to the rim.

In addition, the known device comprises a stepper motor, which after measuring imbalance in balancing the wheel can rotate the light so that the emitted beam of light is directed to the place of balancing on the rim to the forest, to be balanced, for example, with pinning balances.

Furthermore, from WO 96/07880 known method and apparatus for balancing vehicle wheels, in which by means of a scanning device is determined by the circuit, in particular the inner contour of the wheel rim and from this circuit in combination with the measured values of the measuring device of imbalance is determined optimum position and dimensions of the balances.

Disclosure of inventions

The objective of the invention is to provide a method and device of the aforementioned type, which allows a simple way to register the complex characteristics of the circuit, in particular, edges, curves and the like of the wheel rim of the vehicle.

In accordance with the invention, in the method of the aforementioned type, this problem is solved by the distinguishing signs of paragraph 1 of the formula of the invention and the device of the above type by means of the distinctive features of paragraph 10 of the claims.

To this end, the beam is emitted, in particular, light source, is made in the form of a laser, and sensitive to changes in position of the receiving device, which receives the beam reflected from the area of the wheel, the scanned beam emitted synchronously rotated around a common axis to sequentially step-by-step measurements, the interval for which fishing is essentially perpendicular to the plane of measurement, formed by the surface of the wheel rim of the vehicle. The sequential step-by-step measuring the corresponding distances are measured from the scanned one after the other sections of the wheel to the original point, measured in a stationary position on the balancing machine, which makes measurements of imbalance. Preferably, the corresponding distance to source point, measured in the direction of the emitted light beam and the reflected beam of light using a one-dimensional active triangulation method. This necessarily implies the determination of the position of each of the scanned area of the wheel relative to the stationary on the machine original point. Of the many interconnected scanned and measured sections of the wheel can be determined very accurately the contour, in particular the inner contour of the vehicle wheels. The scanning movement is a stepping motor that rotates synchronously with a light source and sensitive to changes in position of the receiving device around a common axis of rotation. For this purpose, the light source and sensitive to changes in position of the receiving device can be mounted on a common rack, rotating around the axis of rotation. Using resolver sensor that can be embedded in a stepper motor or set individual p is, the determined position angle of the light source and sensitive to changes in position of the receiving device and transmitted to the processing unit together with the measuring signals are sensitive to changes in position of the receiving device. The axis of rotation, around which rotates the light source and sensitive to changes in position of the receiving device has a specified position opposite to the original point, which may be provided fixed on the balancing machine.

The plane of measurement, which moves the light source and sensitive to changes in position of the receiving device and, accordingly, the radiated and reflected rays of light, is preferably parallel to the axis of the wheel. When located horizontal axis of the wheel plane measurements can be carried out below the wheel axis. However, the plane of the measuring wheel may be also inclined to a horizontal line, in particular radially relative to the measuring roller, and consequently the axis of the wheel.

In addition, the light beam can be scanned located radially section of the drive wheels of the vehicle. Thus preferably it is possible to scan or to determine the angular position of the points of the base of the spokes or jumpers, passing radially from the middle part of the wheel disc. These measured the values can then be used for placement of weights behind the spokes, as shown in the US 5591909.

The angle of rotation for the General movement of rotation of the light source and sensitive to changes in position of the receiving device around a common axis of rotation preferably be measured so that, starting approximately from the center of the wheel radially through the passing section of the wheel disc, the inner surface of the rim and the rim of the tire, the scanning beam of light and accepted by the receiver, the reflected component of the beam could be rotated. In addition, when rotating the wheel by using the invention it is possible to determine the lateral displacement in the axial direction of the sections of the wheel, a scanned beam of light.

After measuring the imbalance of the light beam can be directed to the site balancing on the wheel on which you want to perform the balancing imbalance, as it is known from WO 98/10261.

Brief description of drawings

The invention is illustrated in the further description of its variants, with reference to the drawings figures, in which:

Figure 1 depicts a top view of the exemplary embodiment of the scanning device for optically scanning a balancing of the vehicle;

Figure 2 depicts shown in figure 1 scanning device mounted on the bottom side of the dynamometer of the balancing machine in the form below;

Figure 3 depicts a front view in the axial direction the attachment of the measuring roller, shown in figure 1 and 2 of the exemplary embodiment;

Figure 4 depicts the individual elements of the scanning device in ISO.

Presented on the figures, the device for optical scanning of a balancing of the wheels 1 of the vehicle with the radial part 23 of the wheel disc and rim 22 includes a light source 6 and sensitive to changes in position of the receiving device 7, which are mounted on a common rack 18. Total hour 18 may take the form of a bent lever, on both ends of the light source 6 and sensitive to changes in position of the receiving device. Hour 18 and fixed thereto, the light source 6 and sensitive to changes in position of the receiving device 7 is installed with the possibility of rotation around the axis of rotation 4.

In a known manner a balancing wheel 1 of the vehicle is fixed on the measuring shaft 2 of the balancing machine, with the dynamometer 16 shown in figure 2 and 3. Fixing a balancing of the wheels 1 of the vehicle is carried out in the center so that the axis of the wheel 3 and the axis 11 of the measuring roller are aligned, when the wheel of the vehicle is fixed for measuring the unbalance of the measuring roller 2.

The dynamometer 16 can be performed in a known manner, for example as shown in WO 00/14503 (DE 19844975 A1). The dynamometer has oporn the e plates 12-15, are pivotally connected to each other and are located essentially in the vertical direction. Due to such structure of the measuring circuit are formed virtual areas supports the measuring roller 2 on the frame 17 of the balancing machine. Using transducers, which shapes not illustrated in detail, are measured centrifugal forces corresponding to the imbalance of the wheel, and processed in a known manner for balancing in an electronic processing unit 8.

To optimize balancing using the depicted device can determine the contour of the inner side of the rim 22 facing towards the axis 3 of the wheel and the radial portion 23 of the drive wheels. On the radial portion 23 of the wheel disc, you can define the position of the drives and radial ridges, in particular the angular position of the points of the base in the area of the wheel axis.

To do this, in the plane of measurement, as shown in figure 1, emitted by the light source 6 by the light beam scanned by the corresponding points on the wheel of a vehicle, in particular on its internal parts. Reflected from the scan beam is made sensitive to the change of position of the receiver 7. It may have to do this optical receiving device 24, the focusing the reflected beam on the sensitive element of the CCD 25 (charge coupled device). Yes the hydrated sensitive CCD element can be processed independently from each other several local maximums of the functions of illumination. The direction of the reflected beam depends on the distance of the scanned area from the light source 6. Therefore, depending on this distance, the reflected beam is directed to the optical receiver 24 on a specific area of the sensing element CCD 25, which then sends a signal sensitive to changes in position and, accordingly, irrespective of the provisions in the electronic processing unit 8.

When processing data on the contour of the wheel with a drive of rotation 5, which has a total rack 18 and the stepping motor 10 and not shown in more detail the intermediate gear is necessary turning movement of the light source 6 and the receiver 7. With the help of the stepping motor 10 hour 18 is rotated by a small angular amount in the plane of measurement. Thus scanned successive points or areas of the vehicle and their respective distance from the light source 6 are determined using the measurement signals transmitted within the sensor element of the CCD 25.

Since the axis of rotation 4, around which rotates the light source 6 and the sensitive element of the CCD 25, mounted on the frame 17 of the machine still receive the exact positioning of the site, scanned in each case on wheel vehicles is a, relative to the dynamometer 16, in particular sensors of the dynamometer. Therefore, the obtained measurement data can be processed with the data measuring dynamometer 16, which are defined in the measurement of the imbalance on the wheel of the vehicle, the optical balancing, as shown in DE 4122844 A1.

The corresponding values of the angular positions of the light source 6 and sensitive to changes in position of the receiving device 7 and the sensing element CCD 25 are processed in rotary-sensor 9, which is a built-in stepping motor 10, or can be installed separately. The corresponding signals of the angle of rotation fed from a selsyn transmitter 9 in the electronic processing unit 8.

How, in particular, can be seen from figure 3, the plane of measurement, which is installed and turn the light source 6 and sensitive to changes in position of the receiving device 7, is below the dynamometer 16 of the balancing machine. For this hour 18, made in the form of a bent lever, installed with the possibility of rotation around the axis 4 of rotation with overcoming pre-tension of the spring 20 on the plate 19 hours (figure 4). Plate 19 rack secured through a curved mounting plate 21 on the frame 17 of the balancing machine, for example by means of threaded connections (figure 3 and 4). For compact placement of Sagawa what about the motor 10 can be set in the bearing plates 12-15 dynamometer 16.

Figure 3 shows the placement of the stepping motor 10 via the supporting plate.

The spring 20, resting his elbows 26, 27 on the support plate 19 and the rack 18, the light source 6 and sensitive to changes in position of the receiving device 7 are pre-tension in the resting position. In this rest position the light source 6 and coming out of the light beam is directed at the Central section of the wheel 1 of the vehicle close to the axis 3 of the wheel. Therefore, when scanning the inner surface of the vehicle wheels scanning emitted by the light beam 6 is rotated by the drive of the stepping motor from the inside, i.e. near the axis 3 of the wheel outwards, i.e. towards the periphery of the wheel, beyond the efforts of the pre-tension of the spring 20.

With the help of the device shown it is possible to determine the lateral deflection in the axial direction of the scanned areas of the wheel, in particular on located on the scanned radius sections of the wheel.

The list of items

1 wheel of a vehicle

2 measuring roller

3 axis wheels

4 the axis of rotation

5 rotation drive

6, the light source

7 the receiving device

8 electronic data processing

9 resolver sensor

10 stepper motor

11 axis Izmeritel the nogo roller

12 support plate

13 support plate

14 backing plate

15 of the support plate

16 dynamometer

17 Rama

18 swivel stand

19 plate rack

20 spring

21 of the fixing plate

22 rim

23 radial part of the disk wheel

24 optical part of the receiving device

25 sensitive element CCD

26 bend springs

27 bend springs

1. The method of optical scanning of the vehicle wheels, particularly wheels of the vehicle, according to which is scanned by a beam of light emitted by the light source, the area of the wheel, take the reflected beam is sensitive to the change of position of the receiver and using the directions of the emitted and reflected beams measure the distance from the scanned area to the original point, characterized in that the measured beam and sensitive to changes in position of the receiving device synchronously rotate around a common axis in the plane of measurement, passing through the surface of the wheel rim of the vehicle at an obtuse or approximately a right angle for sequential measurements.

2. The method according to claim 1, characterized in that the sequential measurement is carried out in the plane of measurement, lying outside the axis of the wheel and parallel to the axis of the wheel.

3. The method according to one of claim 1 or 2, characterized in that the serial operations measurement is carried out in the plane of measurement, below is located horizontally to the axis of the wheel.

4. The method according to claim 3, characterized in that sequential measurements made in the horizontal plane.

5. The method according to one of claims 1 to 4, characterized in that it further scan the radiated beam of light located in the radial direction of the disk area of the wheel to determine the angular position, in particular, points to the base of the spokes or jumpers, passing radially from the Central portion of the disc wheel.

6. The method according to one of claims 1 to 5, characterized in that the determined axial lateral displacement plots of the rotating wheel, and the emitted beam at least during rotation of a wheel radiate in the direction corresponding to a defined radius.

7. The method according to one of claims 1 to 6, characterized in that in the measurement of the radiated beam first scans the area of the wheel that is located closer to the wheel axis, and the beam is then turned to the periphery of the wheel.

8. The method according to one of claims 1 to 7, characterized in that on the basis of the signals measured using a one-dimensional triangulation sensitive to changes in position of the receiver corresponding value of the position angle of the emitted and reflected from the scanned spot beams define the distance from the scanned area to the starting point.

9. The method according to onomous claims 1 to 8, characterized in that when the measurement of the imbalance of the emitted beam is directed to the area of balancing on the wheel.

10. A device for optical scanning of a balancing wheels (1) of the vehicle containing the measuring roller (2), which is fixed to the wheel for rotation about an axis of rotation (3), the light source (6)that directs a beam of light on the area of the wheel, are sensitive to changes in position of the receiving device (7)for receiving the beam reflected from the scan wheel drive rotation (5) for synchronizing the movement of rotation of the light source (6) and receiving device (7) around a common axis (4) and an electronic processing unit (8) for processing the measured values are sensitive to changes in position of the receiving device (7) to determine the distance from the scanned light source (6) plot the wheels of the vehicle to the original point, characterized in that the drive of rotation (5) has a stepper motor (10), and the resolver sensor (9), the guide signal proportional to the corresponding position of the rotation angle of the stepping motor (10)connected to an electronic processing unit (8).

11. The device according to claim 10, characterized in that in the horizontal position of the measuring roller (2) the light source (6) and the receiving device (7) set the ENES can be rotated in a plane below the measuring roller (2).

12. Device according to one of claim 10 or 11, characterized in that the axis of rotation (4) is perpendicular to the axis (11) of the measuring roller.

13. The device according to item 12, characterized in that the axis of rotation (4) is located outside the axis (11) of the measuring roller.

14. Device according to one of PP-13, characterized in that the measuring roller (2) through the United hinged to each other of the support plate (12-15) dynamometer 16 is made based on the frame (17), stepper motor (10) is installed between the support plates (12-15), and the light source (6) and the receiving device (7) mounted below the supporting plates (12-15).

15. Device according to one of PP-14, characterized in that the light source (6) and the receiving device (7) are pre-tension in the resting position.



 

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