WO2005028997A1

WO2005028997A1 - Wheel displacement measuring device

Info

Publication number: WO2005028997A1
Application number: PCT/JP2004/010021
Authority: WO
Inventors: Jun Maeno; Toshiaki Suzuki; Makoto Takai; Takumi Wakamatsu; Masayasu Tsuzuki
Original assignee: Ishikawajima Inspection & Instrumentation Co., Ltd.; Central Motor Wheel Co., Ltd.
Priority date: 2003-09-17
Filing date: 2004-07-14
Publication date: 2005-03-31
Also published as: JP4454994B2; JP2005091141A

Abstract

A wheel displacement measuring device, wherein to increase measuring accuracy by eliminating the effect of the deformation of a mounting shaft (3) on a wheel (2) by the application of load thereto, highly rigid support arms (5) and (6) are fitted to the tip part of the mounting shaft (3) extendedly to be supported at the displacement reference point (O) of the wheel (2), and sensors (7) and (8) are disposed on the support arms (5) and (6).

Description

Specification

Wheel displacement measuring device

Technical field

The present invention relates to a wheel displacement measuring device for measuring a displacement of a vehicle wheel due to a load.

Background art

[0002] Conventionally, a wheel displacement measuring device for measuring the displacement of a vehicle wheel due to the addition of a load uses a base body frame 1 as a base as shown in FIG. A mounting shaft 3 for mounting the wheel 2 is provided in a substantially horizontal direction so that the point 〇 is located, and the load applying device 4 for applying a load to the wheel 2 mounted on the mounting shaft 3 is provided as described above. It is installed on the main body frame 1 and the main body frame 1 forces the support arms 5 and 6 to protrude, and the displacement reference point of the wheel 2 to which the load applying device 4 applies a load to the support arms 5 and 6. It has a configuration in which sensors 7 and 8 for measuring the displacement of each part with respect to O are arranged.

The load applying device 4 can apply a load to the wheel 2 by applying a desired load to the tire 9 fitted to the wheel 2 in the radial direction and the axial direction. You can do it.

[0004] The sensors 7 and 8 are mounted on supporting arms 5 and 6 so as to face the outer surface and the inner peripheral surface of the wheel 2, and for example, a displacement detector such as an optical type or an eddy current type is used. It is used to measure the displacement relative to the displacement reference point O without contacting the outer surface and the inner peripheral surface of the wheel 2.

[0005] In the wheel displacement measuring device as described above, the wheel 2 is attached to the tip end of the mounting shaft 3 using a bolt and a nut (not shown), and the load is first applied to the wheel 2 by the load applying device 4. In a state where no load is applied, the coordinates with the origin at the displacement reference point O at predetermined positions on the outer surface and the inner peripheral surface of the wheel 2 are measured in advance by the sensors 7 and 8, and then the load is applied. By applying a desired load to the tire 9 fitted to the wheel 2 by the device 4 in the radial direction and the axial direction, the wheel 9 With the load applied to the wheel 2, the sensors 7, 8 measure the coordinates with the origin at the displacement reference point における at a predetermined location on the outer surface and the inner peripheral surface of the wheel 2, and when the load is applied. The displacement of each part of the wheel 2 with respect to the displacement reference point O is obtained based on the difference between the coordinates at the point of no load and the coordinates at the time of no load.

[0006] A wheel displacement measuring device having a structure as shown in Fig. 1 is not found in patent documents and non-patent documents, but measures the position and angle of attachment of a wheel to a vehicle, such as a wheel alignment. For example, there is Patent Document 1.

Patent Document 1: Japanese Patent Laid-Open No. 6-344942

Disclosure of the invention

Problems to be solved by the invention

However, in the case of the conventional wheel displacement measuring device as shown in FIG. 1, the sensors 7 and 8 are disposed on the support arms 5 and 6 that protrude from the main body frame 1. Therefore, when the mounting shaft 3 is deformed due to the load applied to the wheel 2 and the displacement reference point O of the wheel 2 moves, the relative positions of the sensors 7 and 8 with respect to the displacement reference point O of the wheel 2 change. It is difficult to ignore the deformation of the mounting shaft 3 separately from the deformation of the wheel 2 itself, and as a result, the displacement of each part of the wheel 2 measured by the sensors 7 and 8 is the deformation of the mounting shaft 3 However, when the measurement accuracy deteriorates, it has a disadvantage.

[0008] Incidentally, for example, in the case of a general automobile, the relationship between the vertical (radial) load acting on the mounting shaft 3 when the load is applied to the wheel 2 and the amount of axial deflection at the tip of the mounting shaft 3 is shown in FIG. When the vertical (radial) load acting on the mounting shaft 3 (corresponding to the point A in Fig. 2) acting on the mounting shaft 3 with the application of the load to the wheel 2, the horizontal (axial direction) load is changed. The change in the amount of deflection of the shaft at the tip of the mounting shaft 3 when the shaft is bent is as shown in FIG. 3, and the occurrence of such shaft deflection in the mounting shaft 3 causes a decrease in measurement accuracy.

[0009] In view of such circumstances, an object of the present invention is to provide a wheel displacement measuring device which can be prevented from being affected by deformation of a mounting shaft due to application of a load to a wheel and can improve measurement accuracy. Is what you do. Means for solving the problem

[0010] The present invention provides a mounting shaft for mounting the wheel so as to protrude from the main body frame and position a wheel displacement reference point at a tip end thereof,

A load applying device installed on the main body frame so as to apply a load to a wheel attached to the attachment shaft;

A support arm attached to the tip of the mounting shaft so as to extend with the displacement reference point of the wheel as a support point;

A sensor disposed on the support arm so as to measure a displacement of each part with respect to a displacement reference point of the wheel to which a load is applied by the load applying device;

The present invention is directed to a wheel displacement measuring device characterized by comprising:

According to the above means, the following effects can be obtained.

[0012] The wheel is mounted so that its displacement reference point is located at the tip of the mounting shaft, and the sensor is disposed on the support arm extending from the tip of the mounting shaft. Even if the mounting shaft is deformed due to the application of the load and the shaft deflection occurs, and the displacement reference point of the wheel moves, the relative position of the sensor with respect to the displacement reference point of the wheel does not change. The deformation can be disregarded from the deformation of the wheel itself and ignored, and as a result, the displacement of each part of the wheel measured by the sensor is only with respect to the displacement reference point, and the measurement accuracy is improved. Become.

The invention's effect

[0013] According to the wheel displacement measuring device of the present invention, it is possible to eliminate the influence of the deformation of the mounting shaft due to the application of a load to the wheel, and to improve the measurement accuracy.

Brief Description of Drawings

FIG. 1 is an overall schematic configuration diagram of a conventional example.

FIG. 2 is a diagram showing a relationship between a vertical (radial) load acting on a mounting shaft as a load is applied to a wheel and an amount of axial deflection of a tip of the mounting shaft.

[Fig. 3] Shaft deflection at the tip of the mounting shaft when changing the horizontal (axial direction) load when the vertical (radial) load acting on the mounting shaft is constant when the load is applied to the wheel It is a diagram showing the change of quantity.

Garden 4] is an overall schematic configuration diagram of an embodiment of the present invention.

FIG. 5 is an enlarged view of a main part of a measuring unit in one embodiment of the present invention.

Explanation of symbols

1 Body frame

2 wheels

3 Mounting shaft

4 Loading device

5 Support arm

6 Support arm

7 Sensor

8 Sensor

9 tires

〇 Displacement reference point

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 4 and 5 show one embodiment of the present invention. In the drawings, the portions denoted by the same reference numerals as those in FIG. 1 represent the same components, and the basic configuration is the same as that shown in FIG. The feature of this example is that the highly rigid support arms 5 and 6 are attached to the tip of the mounting shaft 3 as shown in FIGS. The point is that the sensor is mounted so as to extend with O as a support point, and the sensors 7 and 8 are disposed with respect to the support arms 5 and 6.

In the illustrated example, the support arm 5 is a highly rigid rod-shaped body, and penetrates a center hole 10 formed in the axial center of the wheel 2 so as to penetrate the outer surface side of the wheel 2 ( 4 and 5, a horizontal stage 12 extending in the axial direction of the wheel 2 is disposed on a vertical stage 11 suspended from the tip of the support arm 5 so as to be vertically adjustable. The sensor 7 is attached to the horizontal stage 12 via an angle adjustment attachment 14 having an angle adjustment seat 13 formed of a cylindrical surface and capable of adjusting the position of the sensor 7 in the axial direction of the wheel 2, and , The support arm 6 is a half rigid cylindrical member having high rigidity. A body extending along the outer periphery of the mounting shaft 3 toward the base end thereof (to the right in FIGS. 4 and 5) and hanging from the end of the support arm 6 to the wheel. A horizontal stage 16 extending in the axial direction of the wheel 2 is disposed so as to be adjustable in the vertical direction, and the horizontal stage 16 is provided with an angle adjustment seat formed of a cylindrical surface and capable of adjusting the position of the sensor 8 in the axial direction of the wheel 2. It is mounted so that the angle can be adjusted via an angle adjustment attachment 18 having 17.

The angle adjustment attachment 14 to which the sensor 7 is attached is attached to the horizontal stage 12 with a 90 ° phase shift so that the sensor 7 is directed downward or sideways. With the sensor facing down, it faces the circumferential measurement target 19 attached to the outer surface of the wheel 2 to measure its displacement, or with the sensor 7 turned sideways, it faces the outer surface of the wheel 2. The displacement can be measured. Similarly, the angle adjustment attachment 18 to which the sensor 8 is mounted is attached to the horizontal stage 16 with a 90 ° phase shift so that the sensor 8 is directed downward or sideways. With the sensor 8 facing downward, the displacement is measured by facing the inner peripheral surface of the wheel 2, or with the sensor 8 oriented laterally, the displacement is measured by facing the inner surface of the wheel 2. .

Next, the operation of the above illustrated example will be described.

When calculating the displacement of each part with respect to the displacement reference point O of the wheel 2, the wheel 2 is attached to the tip of the mounting shaft 3 using a bolt and a nut (not shown). On the other hand, in a state where no load is applied by the load applying device 4, the positions of the sensors 7 and 8 are adjusted so that the sensors 7 and 8 are opposed to predetermined positions on the outer surface and the inner peripheral surface of the wheel 2. The coordinates with the displacement reference point 基準 at the origin as the origin are measured in advance, and then a desired load is applied to the tire 9 fitted to the wheel 2 by the load applying device 4 in the radial direction and the axial direction. With the load applied to the wheel 2, the coordinates of the origin and the displacement reference point における at predetermined points on the outer surface and the inner peripheral surface of the wheel 2 are measured by the sensors 7 and 8, With the load Based on the difference between the coordinates in the coordinate and the no-load at the time, the displacement of each part is required against the deflection reference point 〇 wheel 2. The outer surface and inner peripheral surface of the wheel 2 are respectively If there are multiple displacement measurement points, the same operation as described above (that is, the operation of measuring the position when no load is applied and when applying a load) is sequentially performed for multiple positions. For example, even if the vertical stages 11 and 15 and the horizontal stages 12 and 16 are not high-accuracy, the measurement can be performed with the positioning error of the stage canceled, so that high-accuracy measurement can be performed. Another method is to use high-precision vertical stages 11 and 15 and horizontal stages 12 and 16 to measure the coordinates with the displacement reference point O as the origin at all of the multiple locations without load, and then apply a load. In this state, it is also possible to measure the coordinates of the corresponding point with the displacement reference point O as the origin.

Here, the wheel 2 is mounted so that its displacement reference point O is located at the distal end of the mounting shaft 3, and the sensors 7, 8 are supported by a supporter extending from the distal end of the mounting shaft 3. 2 and 3, the mounting shaft 3 is deformed as the load is applied to the wheel 2, causing shaft deflection as shown in FIGS. Even if the displacement reference point O moves, the relative positions of the sensors 7 and 8 with respect to the displacement reference point O of the wheel 2 do not change, and the deformation of the mounting shaft 3 is ignored separately from the deformation of the wheel 2 itself. As a result, the displacement of each part of the wheel 2 measured by the sensors 7 and 8 is only with respect to the displacement reference point O, and the measurement accuracy is improved.

[0023] In this way, it is possible to eliminate the influence of the deformation of the mounting shaft 3 due to the application of the load to the wheel 2, and to improve the measurement accuracy.

[0024] The wheel displacement measuring device of the present invention is not limited to the illustrated example described above, but may be variously modified without departing from the gist of the present invention.

Industrial applicability

[0025] As described above, the wheel displacement measuring device according to the present invention is suitable for measuring the displacement of a vehicle wheel due to the added load.

Claims

The scope of the claims

A mounting shaft protruding from the main body frame and mounting the wheel so that a wheel displacement reference point is located at the tip thereof;

Powerful wheel displacement measurement device.