JPH052801Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention is a four-wheel correlation system for a vehicle that measures and adjusts the alignment of each wheel of a four-wheeled vehicle based on individual or comprehensive correlation. This invention relates to an alignment measuring device.

[Technical background of the invention and its problems]

In general, the steering wheel of a car has a tow, camber, caster,
Special dimensional relationships such as king pin inclination angle are attached. Recently, passenger cars have become significantly lighter and more front-wheel drive. To achieve this, many improvements have been made to wheel alignment characteristics and to improve quality control accuracy in order to improve handling stability, fuel economy, and output. ing. Along with this, the number of vehicles that require adjustment of each alignment element is increasing.

In the past, measurements of each alignment element were mostly made for individual wheels, or for tow, alignment elements that were known only in relation to the left and right wheels.

For example, in order to measure tow, which is one of the alignment elements, a scale rod 22 is extendably provided on a cylinder 21 as shown in FIG. There is a toe-in gauge with writing pins 23 and 24 hanging down. This toe-in gauge has scribing pins 23 and 24
The tip of the wheel is placed on the center line of the ground contact surface of the left and right wheels 26, 27, and the left and right front width and left and right rear width are measured with the scale rod 22, and the toe alignment is evaluated as toe-in and toe-out based on the difference in front and rear dimensions. I was doing it.

However, this toe-in gauge is for the left and right wheels 26,2
Since the center line and horizontality of the ground contact surface of No. 7 were measured visually, there were many measurement error factors and it was not possible to make accurate measurements. Moreover, with this toe gauge, it was not possible to examine the toe of the individual left and right wheels with respect to the traveling direction 25, as well as the overall relationship between the steered wheels and the non-steered wheels.

In addition, Japanese Utility Model Application Publication No. 51-113901 discloses a rotatable spirit level for making the front wheels perpendicular and horizontal to the center of the front wheel, and a square rod that is horizontal to the spirit level with a slideable level at one end. An automobile toe-in amount measuring device is disclosed that includes a storage box and a pair of tape measures stored in the storage box. However, this technique measures only the total tow of the left and right wheels using the dimensions of a pair of tape measures, and cannot measure the individual tow of each wheel.

[Purpose of invention]

This idea was supervised by the above circumstances,
It is an object of the present invention to provide a four-wheel correlation alignment measuring device for a vehicle that can accurately and easily measure alignment factors of each wheel based on comprehensive correlation.

[Summary of the idea]

In this invention, a tow bar is provided on a wheel mounting tool that is removably installed on the front and rear disc wheels so that the tow bar is parallel to the line that forms the toe of the wheel, and the center point of the tow bar is parallel to the axle. At the same time, a center axis scale bar is installed on the front and rear wheels, and an individual tow scale is installed to measure the toe of the wheel by connecting the center axis scale bars installed on the front and rear wheels so as to intersect the cursor line. It is equipped with a toe-in scale to measure the front width and rear width.

[Effect of idea]

According to this invention, it is possible to measure the individual toe of the left and right wheels in the direction of travel and the mutual toe of the front, left, and right wheels based on the overall correlation using the individual toe scale and toe-in scale. The angle can be adjusted to the best condition. Furthermore, since eccentric runout in the rotational direction of the disk wheel can be corrected, accurate and highly accurate measurement can be achieved.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings. In Figures 1 and 2, 1a to 1d are 4
Wheel mounting tools 3a to 3 are attached to disc wheels 2a to 2d of wheels 1a to 1d of wheels of a wheeled vehicle.
d is attached. These wheel mounting tools 3a to 3d
In order to be able to be attached to and detached from the disc wheels 2a to 2d, a pair of telescopic rods 5 each having a claw 4 at the tip are arranged on the upper and lower sides, and the four rods 5 can be moved in the vertical direction in conjunction with each other. This is how it was done. In addition, the wheel mounting tools 3a to 3d are equipped with a mechanism for correcting the eccentric runout in the rotational axis direction of the disc wheels 2a to 2d, and by adjusting this correction mechanism, the wheel alignment reference surface 6a of the wheel mounting tools 3a to 3d can be adjusted. ~6d as the axle 7 of each wheel 1a~1d
It can be orthogonal to a to 7d.

Tow bars 8a to 8d are integrally provided below the wheel mounting tools 3a to 3d so as to be parallel to the wheel alignment reference surfaces 6a to 6d. These tow bars 8a to 8d are arranged so that the wheel alignment reference planes 6a to 6d are orthogonal to the axles 7a to 7d.
7d is set parallel to the line forming the tow.

On the other hand, the center points A, B of the tow bars 8a to 8d,
C, D are provided with central axis scale bars 9a to 9d parallel to the axles 7a to 7d, and scales are written on the scale bars 9a to 9d in the axle direction with the 0 scale as the center. There is. And the front and rear wheels 7a,
7b or 7c, 7d installed on the center axis scale bars 9a, 9b or 9c, 9d, the end of which slides over the center scale bars 9a to 9d. Stretch it so that it can move.
Further, individual tow scale scales 11a to 11d having dimensional scales are provided at one end of the tow bars 8a to 8d so as to be slidable in front, rear, left and right directions. Furthermore, the front wheel 7a,
Winding type tow-in scales 12a, 12d, 12a', 12d' for measuring the front width and rear width of the front wheels 7a, 7d are installed at both ends Af, Ar, Df, Dr of the tow bars 8a, 8d facing each other with the front wheels 7d in between. The winding tow-in scales 12b, 12c, 12b', 12c' are provided so as to be slidable in the front-rear direction, and similarly to the above, take-up tow-in scales 12b, 12c, 12b', 12c' are provided at both ends Bf, Br, Cf, Cr of the tow bars 8b, 8c so as to be slidable in the front-rear direction. .

The traveling direction of this vehicle is the rear axle deflection traveling direction 13
To be correct, the toe angles of each of the wheels 1a to 1d must be set equally on the left and right sides with respect to the geometric center line 14 of the four wheels 1a to 1d. If the toe angle of the rear wheels cannot be adjusted, the direction of travel of the vehicle will be restricted by the direction of deflection of the rear axle, so it is necessary to adjust the toe angle of the front wheels symmetrically. .

To obtain the total toe of the left and right wheels, use the toe-in scales 12a to 12d, 12a' to 12d' to determine the left and right wheels 1a, 1d or 1b, which are arranged front and rear.
By measuring the front width and rear width of 1c, the total toe of the front wheels 1a, 1d and the rear wheels 1b, 1c can be read.

That is, the total toe of the front wheels 1a and 1d
The FTT and the total tow RTT of the rear wheels 1b and 1c can be calculated using the following formula.

FTT = (.-.) RTT = (.-.) If the FTT or RTT values are positive, it is a toe-in, and if it is negative, it is a toe-out.

Next, in order to obtain the individual toe of each wheel 1a to 1d, which is a feature of the present application, the cursor line 10 of the individual toe scale 11a to 11d corresponding to each wheel 1a to 1d,
By reading the passing position of wheel 10' and multiplying each read value by two, individual tow values for each wheel 1a to 1d can be determined.

However, if it is easily determined like this, the distance AD between the front wheels 1a and 1d and the rear wheels 1b,
This is a case where the interval BC between the two positions 1c and 1c is equal.

Normally, the distance between front wheels 1a, 1d and rear wheels 1b, 1c
It is different from AD and BC. For this reason, for example,
Individual toe scale scale 11 corresponding to front wheels 1a, 1d
When the sum of the reading values of a and 11d is FTT', this 2 x FTT' and the previously measured front wheel 1a,
The total tow FTT of 1d is not equal.
The cause of this is that the cursor lines 10 and 10' are not parallel, so in order to correct the parallel error, the ends of the cursor lines 10 and 10' are set above the 0 scale of the central axis scale bars 9b and 9c, respectively. Department,
It is moved on the central axis scale bars 9b and 9c by half the difference between FTT and 2×FTT' to make them parallel.

At the same time, the individual toe scales 11b and 11c are each moved in the same direction by the amount by which the ends of the cursor lines 10 and 10' are moved.

In this way, the distance AD between the front wheels 1a and 1d
After correcting the error in the interval BC between the rear sums 1b and 1c, read the passing positions of the cursor lines 10 and 10' of the individual toe scales 11a to 11d corresponding to each wheel 1a to 1d, and calculate the respective reading values. Multiply by 2,
Individual tow values are determined for each of the wheels 1a to 1d.

Also, when the deflection direction 13 and the geometrical center direction 14 of the rear wheels 1b, 1c do not match, the cursor lines 10, 10' are not parallel, but in this case as well, the error can be detected using the same method as described above. The individual tow value can be determined by correcting.

Therefore, with this configuration, it is possible to measure the total toe of the front and rear wheels and the individual toe of each wheel. The toe angle of the wheels can be adjusted accurately. Furthermore, by making the wheel alignment reference planes 6a to 6d orthogonal to the axle using the correction mechanisms of the wheel mounting devices 3a to 3d, the tow bars 8a to 8d can be set parallel to the lines forming the tows of the wheels 1a to 1d. Therefore, total tow and individual tow can be measured accurately.

Furthermore, as shown in FIG. 2, the wheel alignment reference surfaces 6a to 6d of the wheel mounting devices 3a to 3d are made of magnetized metal, so that the canvas caster gauges 15a to 15d are aligned orthogonally to the measurement axis. It can be used by adsorbing it. This results in
In addition to the comprehensive toe measurement function, a camber caster measurement function can be added, making it easy to realize a comprehensive four-wheel correlation alignment measurement device, and has the advantage of being able to use existing equipment as is. be.

Note that this invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist.

In the above example, the individual toe scale was installed close to the outer diameter of the wheel, so the tow value was calculated by doubling the measured value. In relation to the outer diameter, it can also be determined by multiplying the measured value by a predetermined constant. Further, the scale itself of the individual toe scale may be a scale multiplied by a predetermined constant.

[Brief explanation of the drawing]

Figures 1 and 2 show one embodiment of this invention, Figure 1 is a plan view, Figure 2 is a perspective view, Figure 3 is a plan view showing a conventional toe-in gauge, and Figure 4 is a conventional canine gauge. FIG. 2 is a perspective view for explaining a vacancy gauge. 1a to 1d...Wheel, 2a to 2d...Disc wheel, 3a to 3d...Wheel attachment device, 4...
Claw, 5...Rod, 6a-6d...Wheel alignment reference surface, 7a-7d...Axle, 8a-8d...Tow bar, 9a-9d...Center axis scale bar, 10, 10'
...Casor line, 11a-11d...Individual tow scale, 12a-12d, 12a'-12d'...Take-up tow-in scale, 13...Rear axle deflection direction, 14...Geometric center line, 15a ~15d...
Kyamba Kya Star Gauge.

Claims (1)

[Scope of Claim for Utility Model Registration] A wheel mounting device that is removably installed on the front and rear disc wheels and has a mechanism for correcting eccentric runout in the rotational axis direction of the disc wheel, and a wheel mounting device that is provided integrally with this wheel mounting device and is attached to the wheel. a tow bar parallel to a line forming the tow of the tow bar; a tow-in scale placed at the front and rear of the tow bar for calculating the total toe of the left and right wheels by measuring the front width and rear width of the left and right wheels; and a tow-in scale provided at the center point of the tow bar. a central axle rod parallel to the axle; a pair of cursor lines that are slidably provided on the central axle rods of the front and rear wheels and connect predetermined portions of the central axles; An individual toe scale is provided at one end of the tow bar and calculates the toe of the wheel by measuring the passing position of the cursor line, and is a predetermined multiple of the sum of the measured values for the left and right wheels measured with the individual toe scale. Compare the total tow measured with the above toe-in scale, move a pair of cursor lines evenly on the center bar so that both measured values are equal, and then display each individual toe scale when both measured values become equal. A four-wheel correlation alignment measurement device for a vehicle, characterized in that the measured value of the shaku is multiplied by a predetermined value to calculate the individual toe of the wheel.