JPS6051641B2 - Wheel alignment measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wheel alignment measuring method.

Conventionally, a method for measuring wheel alignment is to place a spirit level against the actual wheels and find each angle, but this method only determines the alignment of individual wheels, and does not measure the alignment of all wheels on the vehicle. It was not possible to make a global measurement of

For this reason, the straight-line performance of the vehicle was sometimes not accurate. The present invention has been made in view of these points, and an object thereof is to provide a wheel alignment measuring method that allows not only individual wheels of a vehicle to be measured but also the overall measurement between the wheels to be easily performed.

Next, one embodiment of the present invention will be described based on FIGS. 1 to 6.

A vehicle 1 is installed on a floor surface, and a fixed base 3 of a reduction machine 2 is installed in a fixed direction at a fixed position a on the floor surface in the front center of the vehicle 1.

This reduction machine 2 has a ring-shaped rotating base 5 rotatably fitted to the upper part of the shaft 4 of the fixed base 3, and a receiving part 6 is fixed to the upper end of the shaft 4. 6 locks the upper surface of the rotating base 5, and a substrate 7 having a reduced space is provided on the receiving portion 6 so as to be removable by the magnetic force of the receiving portion 6.
Also, from the side surface of the rotating base 5, the gripping part 8 and the supporting part 9 are
A universal bearing 11 is supported by the grip part 8 and the support part 9, an outer rod 12 is rotatably supported by the universal bearing 11, and an inner rod 13 is provided inside the outer rod 12. one end of the link 14 is rotatably attached to the outer end of the outer rod 12, and the base end of the measurement detection rod 15 is rotatably attached to the other end of the link 14. The middle part of the measurement detection rod 15 is rotatably supported by the outer end of the inner rod 13, and the detection end 16 is bent at the tip of the measurement detection rod 15. A link 17 and a measurement take-out rod 18 are provided at the inner end of the rod 12 and the inner end of the inner rod 13, and a take-out rod 19 is formed by bending the tip and end of the measurement take-out rod 18.

20 is a fixing screw for the rotating base 5.

Note that the Ξ-gon formed by the outer ends of the link 14, the measurement detection rod 15, and the inner rod 13 is made equal to the triangle formed by the inner ends of the link 17, the measurement pick-up rod 18, and the inner rod 13. and also the measuring stick 18
The length between the intermediate shaft support 21 and the extraction end 19 is set to a reduction ratio of the length between the intermediate shaft support 22 and the detection end 16 of the measurement detection rod 15. In addition, an indicator needle 23 is attached to the extraction end 19 of the measurement extraction rod 18 at its mounting screw portion 2.
It is detachably provided by a female screw 25 which is screwed into the hole 4.

Then, the detection end 16 of the reduction machine 2 is sequentially brought into contact with three points on the outer surface of the wheel H on one front side of the vehicle 1 and the tip of the knuckle spindle S at the center of the wheel H. Contact points are three-dimensionally indicated on the substrate 7 in the reduced space with the tips of the indicator needles 23, and each indicator needle 23 is fixed on the substrate 7 by a holder 31 so as to maintain that state.

The above three points should not be arranged on a straight line. This holder 31 includes a magnetic base 32 that attracts the substrate 7, and a rod 3 that moves up and down with respect to a cylindrical portion 33 of this base 32.
4, a rod 35 that is raised relative to this rod 34,
A holding part 36 rotatably fitted to the tip of this rod 35
The rod 34 is fixed by a screw 37, the rod 35 is fixed by a screw 38, the holding part 36 is fixed from rotation by a screw 39, and the rotation is fixed by a screw 41. Tighten the indicator needle 23 that is fitted inside. After the indicator needle 23 is maintained in a fixed position by the holder 31, the female screw 25 is removed to release the indicator needle 23 from the measuring rod 19.

After setting up the plurality of indicator needles 23 corresponding to the wheels H on the front side of the vehicle 1 on the board 7 in this way, the next step is to rotate the rotary base 5 of the reduction machine 2 by 180 turns and fix it. , the rods 12 and 13 are turned to the opposite side, and at the same time the measurement detection rod 15 is moved toward the vehicle. 1 side, and in the same way as the wheel H on the front one side above, place the wheel H on the other front side.
and the tip of the knuckle spindle S are three-dimensionally indicated on the substrate 7 in the reduced space by the tip of the indicator needle 23 via the holder 31.

At this time, the substrate 7 is fixed at a fixed position. Furthermore, the fixed base 3 of the reduction machine 2 is moved to a fixed position b on the floor at the rear center of the vehicle 1.
At the same time, the rotation base 5 is rotated 180 degrees and fixed, the measurement detection rod 15 is directed toward the vehicle 1, and the rotation base 5 is fixed in the same direction as in the case of the fixed position a. Three points on the outer surface of the wheel H on one side and the other rear side and the tip of the knuckle spindle S are three-dimensionally indicated on the substrate 7 in the reduced space using the tip of the indicator needle 23 via the holder 31. .

The center and direction of the board 7 are made to match the centers and directions of the fixed positions A and b, and the board 7 is removed from the receiving part 6 even when the reducing machine 2 is moved from the fixed position a to the fixed position b. Do not move, move, or change direction. After each measurement point of the four wheels H is indicated on one board 7 by the indicator needle 23 in this way, the tip of the indicator needle 23 that indicates the outer surface of each wheel H is set at an angle. The measurement plate 51 is brought into contact.

This angle measuring plate 51 is supported by a stand 52 so that its direction and elevation can be adjusted. That is, the stand 52 horizontally fixes the main body of the rotary potentiometer 54 to the magnet base 53, and the rotary shaft 55 of the potentiometer 54 is vertically erected. The main body of the potentiometer 56 is fixed vertically, a support part 58 is fixed to the rotation shaft 57 on the side of the potentiometer 56, and the angle measuring plate 51 is fixed to the outer surface of the support part 58. Then, if the angle measuring plate 51 is brought into contact with the tips of the three indicator hands 23 corresponding to the wheel H, the electric output of the potentiometer 54 will be used to measure the position of the front wheel H when observed from above. The inclination angle, that is, the toe-in angle θ1 can be measured, and the electrical output of the potentiometer 56 allows the front wheel H to be measured.
The inclination angle when observed from the front, that is, the camber angle θ
2 can be measured.

Similarly, the outer surface of the rear wheel H can also be observed on the same substrate 7. Furthermore, since there is an indicator needle 23a on the substrate 7 that indicates the tip of the knuckle spindle S of each wheel H, there is a needle 23a that indicates the tip of the knuckle spindle S of the virtual wheel H1 on both rear sides, for example, between the indicator needles 238, which correspond to the axle. A line 61 is provided, and the vehicle 1 is placed at a right angle from the center of this line 61.
A line 62 corresponding to the center shaft of It is determined whether the wheel head is normally symmetrical with respect to the line 62.

In the above embodiment, when each point of the wheel H is transferred from the actual space to the reduced space using the reducing machine 2, each point is spatially inverted due to the structure of the reducing machine 2, but this is done by using the angle measuring plate 51. Since the potentiometers 54 and 56 are used when making measurements, the electrical outputs of the potentiometers 54 and 56 can be corrected to the actual values by reversing the wiring and taking out the electrical outputs.

Further, as another embodiment of the indicator needle 23, an indicator needle body 71 with a stand shown in FIG. 7 may be used.

This indicator body 71 with a stand has a rod 74 fitted into a cylindrical part 73 of a magnet base 72 that attracts the substrate 7 so as to be movable up and down, and an indicator needle 76 connected to the upper end of the rod 74 via a universal joint 75. The rod 7 is rotatable in any direction, and screws 77 and 78 are used to connect the rod 7.
4 and the universal joint 75 are fixed. When using this indicator needle body 71 with stand,
A suction rod 81 is installed in place of the indicator needle 23 with a female thread 25 on the take-out end 19 of the measurement take-out rod 18 of the reducing machine 2, and the indicator needle 76 is connected to the indicator needle 76 by the groove 82 at the tip of the suction rod 81. The tip 79 is fitted, and the indicator needle 76 is attracted by the magnet at that portion, and the indicator needle body 71 is suspended. Then, using the reduction machine 2, each measurement point of the wheel H is indicated on the substrate 7 in the reduction space with the tip 79 of the indicator needle body 71 with a stand attached to the suction rod 81, and this instruction is performed. By grounding the base 72 of the stand of the needle body 71 to the substrate 7 and fixing the screws 77 and 78, the tip 79 of the indicator needle 76 is fixed in a fixed position.

Further, although the above-mentioned pointers 23 and 76 are provided directly on the substrate 7, this may be done electrically.

For example, if the board 7 is removed from the receiving part 6 of the reduction machine 2, the three-dimensional coordinate detector 91 shown in FIG.
, and the tip of this detector 91 is connected to the take-out end 19 of the measuring take-out rod 18 of the reduction machine 2 via the universal joint 92. The body of another rotary potentiometer 93 is fixed horizontally, and the body of another rotary potentiometer 95 is fixed vertically to the rotary shaft 94 of this rotary potentiometer 93. The body of the type potentiometer 97 is fixed, and the tip of the direct-acting shaft 98 of the direct-acting potentiometer 97 is connected to the measuring rod 1.
8 through the universal joint 92, and each of the potentiometers 93, 95,
A servo motor drive mechanism 101 is provided on the removed board 7, which is driven using an electric signal outputted from the servo motor 97 as a command signal.

A plurality of servo motor drive mechanisms 101 are provided corresponding to the number of measurement points on the wheel H, and each mechanism 101 has the following functions:
As shown in FIG. 8b, the main body of the rotary motor 102 is fixed on the substrate 7 in the reduced space, and the main body of another rotary motor 104 is orthogonally attached to the upper end of the vertical rotary shaft 103 of this motor 102. The main body of a linear actuator 106 is fixed in a direction orthogonal to the horizontal rotating shaft 105 of this rotating motor 104, and the linear moving shaft 107 of this linear moving actuator 106 is used as an indicator. So, the above motor 102
, 104 and the actuator 106 are detected by potentiometers 111, 112, 113 provided nearby.
The detection signal of 113 is electrically compared with the command signals of potentiometers 93, 95, 97 of the three-dimensional coordinate detector 91, and the servo motor drive mechanism 101 is feedback-controlled. The three-dimensional coordinate position of the extraction end 19 of the rod 18 is indicated by the tip of the linear shaft 107 serving as the indicator of each servo motor drive mechanism 101 on the substrate 7. Further, although the reduction machine 2 has a structure in which the rods 15 and 18 (by the inner rod 13) move forward and backward in the same direction, it may also have a structure in which the rods 15 and 18 move forward and backward in opposite directions, for example. As shown in FIG. 9, in the reducing machine 2, the inner rod is notched in the middle,
It is divided into one inner rod 13a and the other inner seven rods 135, and racks 201 and 202 are mutually protruded from the end faces of each of the inner rods 13a and 13b, and between both racks 201 and 202, this rack 201 ,202
A pinion 203 is arranged to mesh with the pinion 203.
The vibrator 2 may be rotatably supported on the outer lock 12, or the vibrator 2 may be rotatably supported on the outer lock 12, or the vibrator 2 may be rotatably supported on the support portion 9 via a universal bearing 11 supported on a spherical surface, as in the reduction machine shown in FIG.
11 rotatably in any direction, and this vibrator 211
The measurement detection rod 21 is attached to both ends of the
5 and a measurement extraction rod 216 are rotatably supported by shafts 217 and 218, and both sides 221 and 222 of the measurement detection rod 215 are equidistant from the axis 217 and both sides of the measurement extraction rod 216 are equidistant from the axis 218. The parts 223 and 224 may be connected by wires 225 and 226, respectively, or the vibrator 231 may be connected to the support part 9 in any direction via a universal bearing 11 supported by a spherical surface, as in the shrinking machine shown in FIG. Shafts 234, 235 are rotatably supported at both ends of the vibrator 231 via holding parts 232, 233, and pulleys 236, 2 are attached to the shafts 234, 235.
37, a measurement detection rod 238 and a measurement extraction rod 239 are respectively fixed to the shafts 234 and 235, and an endless wire 241 is wound around the pulleys 236 and 237 at both ends.
42, 243 may be fixed to the pulleys 236, 237.

Note that the reduction machine 2 can also be used as a holder for body correction.

For example, if a chuck is provided on the detection end 16 of the measurement detection rod 15, and this chuck holds a sheet metal or the like and locks each movable part of the reduction machine 2, the sheet metal or the like can be fixed during welding or the like. Can be supported in position. As described above, according to the present invention, the side surface of each wheel is placed on the substrate in the reduced space by the reducing machine at least three times.
The tip of the indicator needle in the book gives three-dimensional indications, and the wheel alignment is measured using the angle measuring plate that is in contact with the tip of the indicator needle. Overall measurements can also be easily performed on a single, reduced-size board, and for example, it can be easily determined whether the front wheel is in a state where it can maintain straightness relative to the rear wheel. can.

1 Brief Description of the Drawings FIG. 1 is a perspective view showing an embodiment of the wheel alignment measuring method of the present invention, FIG. 2 is a perspective view of the reduction machine, and FIG.
The figure is a perspective view of the indicator and the holder, Figure 4 is a perspective view of the indicator provided on the board, Figure 5 is a side view of the wheel alignment being measured by the angle measuring plate, and Figure 6 is a perspective view of the indicator needle and holder. is a plan view thereof, FIG. 7 is a partially cutaway perspective view showing another embodiment of the indicator, FIG. 8a is a schematic perspective view of a three-dimensional coordinate detector in another embodiment of the present invention, FIG. b is a schematic perspective view of the servo motor drive mechanism, FIG. 9 is a sectional view of the main part showing the second embodiment of the reducing machine, FIG. 10 is a plan view showing the third embodiment of the reducing machine, and FIG. 11 FIG. 3 is a plan view showing a fourth embodiment of the reduction machine.

1...Vehicle, 2...Reduction machine, 7...
... Board, 23, 76, 107 ... Indicator needle,
51...Angle measurement plate, H...Wheel.

Claims (1)

[Claims] 1 Using a reduction machine, the sides of each wheel of the vehicle are three-dimensionally indicated on the substrate in the reduction space using the tips of at least three pointers, and at least three points corresponding to each wheel are
A wheel alignment measuring method characterized in that an angle measuring plate is brought into contact with the tip of an indicator needle, and wheel alignment is measured using this angle measuring plate.