JP2002062103A - Device and method for measuring amount of deflection in tire width and method for estimating tire load - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device and method of a simple constitution for measuring the amount of deflection in tires capable of easily measuring the amount of deflection in the direction of tire width of the tires mounted to a motor vehicle. SOLUTION: The base 16A of the device 10A for measuring the amount of deflection in the tire width is fixed by magnetic force to a rim 14 in the vicinity of the tire 12A at a section to receive grounding pressure from a road surface. The base 16B of the other device 10B for measuring the amount of deflection in the tire width is fixed to a rim 14 in the vicinity of the tire 12B at a section not to receive grounding pressure from the road surface. A slide bar 26A is moved in the direction of the tire width and brought into contact in the direction of the tire width with the side part of the tire 12A to measure the amount of protrusion. The amount of protrusion in the direction of the tire width in the tire 12B at a section not to receive grounding pressure from the road surface is similarly measured. The difference between the measured amounts of protrusions is obtained to obtain the amount of deflection in the width of the tire 12. By this, it is possible to measure the amount of deflection in the tire width easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire width deflection measuring device for measuring a tire width direction deflection amount of a tire mounted on a vehicle (particularly a large dump truck or the like), a tire width deflection amount measuring method and a tire width deflection amount measuring device. The present invention relates to a tire load load estimation method.

[0002]

2. Description of the Related Art Conventionally, there has been no apparatus for measuring the amount of deflection in the tire width direction of a tire when the tire is mounted on a vehicle. I was measuring. Here, the amount of deflection in the tire width direction of the tire is measured by measuring the amount of protrusion in the tire width direction of the side portion of the tire at the portion receiving the contact pressure from the road surface, and measuring the side of the tire at the portion not receiving the contact pressure from the road surface The protrusion amount of the portion in the tire width direction was measured, and the difference was obtained from the difference.

However, in this method, when measuring the amount of deflection of the tire, the tire must be removed from the vehicle, resulting in poor work efficiency, lack of quick work, and an increase in labor. is there.

On the other hand, in order to measure the amount of deflection when the tire is mounted on a vehicle, it is necessary to clarify the load applied to the tire.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in consideration of the above-described circumstances, and has been made in consideration of the above-mentioned facts. Device and method for measuring tire width deflection,
Another object of the present invention is to provide a tire load load estimating method capable of estimating a load applied to a tire.

[0006]

According to a first aspect of the present invention, there is provided a tire width deflection measuring apparatus for fixing a tire mounted on a vehicle to a rim of a tire and measuring a deflection amount of the tire in a tire width direction. A quantity measuring device, a fixing member fixed to the rim, a rail member provided on the fixing member, and extending in the tire width direction when the fixing member is fixed to the rim,
A moving member that moves on the rail member in the width direction of the tire and contacts the side portion of the tire, and a movement of the moving member that is provided on the moving member or the rail member until the moving member comes into contact with the side portion of the tire. Display means for displaying the amount.

Next, the operation and effect of the tire width deflection measuring device according to the first aspect will be described.

In the tire width deflection measuring apparatus of the present invention, the fixing member is fixed to the rim of the tire mounted on the vehicle. The moving member is moved on a rail member provided on the fixed member, and is stopped while being in contact with the side portion of the tire.
Then, the amount of protrusion of the side portion of the tire in the tire width direction can be easily measured from the amount of movement of the moving member displayed on the display means.

Further, two tire width deflection measuring devices of the present invention are used, and one of the tire width deflection measuring devices measures a protrusion amount in a tire width direction of a portion of a tire receiving a contact pressure from a road surface, The other tire width deflection amount measuring device measures the amount of protrusion of the tire in the tire width direction at a portion not receiving the contact pressure from the road surface, and determines the difference between the amount of protrusion of the latter from the amount of protrusion of the former. The amount of deflection in the tire width direction (the amount of tire width deflection) can also be determined.

Note that, without using two tire width deflection amount measuring devices, a single tire width deflection amount measuring device can be used to determine the amount of protrusion of the tire in the tire width direction at the portion receiving the contact pressure and the contact pressure. The protrusion amount in the tire width direction of the tire in the tire width direction (tire width deflection amount) may be obtained by measuring both the protrusion amount in the tire width direction of the tire at the portion that has not been received.

According to the present invention, the amount of protrusion in the tire width direction and the amount of deflection in the tire width direction of the tire can be easily measured while the tire is mounted on the vehicle. Can be carried out.

According to a second aspect of the present invention, in the tire width deflection measuring apparatus, the fixing member is formed of a magnetic material, and is fixed to the rim by a magnetic force.

Next, the operation and effect of the tire width deflection measuring device according to the second aspect will be described.

The fixing member is made of a magnetic material and is fixed to, for example, an iron rim by magnetic force. Therefore, the fixing member can be easily fixed to the rim without using a fixing tool or the like. For this reason, the measurement operation can be performed efficiently and quickly.

According to a third aspect of the present invention, there is provided a method for measuring a tire width deflection amount, wherein the tire width deflection amount measuring device is fixed to two places on a rim of a tire mounted on a vehicle, respectively. A first measurement step of measuring the amount of protrusion of the tire in the tire width direction at a portion receiving the contact pressure from the road surface with the tire width deflection amount measuring device, and the ground contact from the road surface with the other tire width deflection amount measuring device A second measuring step of measuring the amount of protrusion of the tire in the tire width direction at a portion not receiving the pressure; and a difference between the amount of protrusion in the first measurement step and the amount of protrusion in the second measurement step. And a third measuring step for obtaining the amount of deflection.

Next, the function and effect of the method for measuring the amount of tire width deflection according to the third aspect will be described.

According to the method for measuring the amount of tire width deflection of the present invention, first, in the first measuring step, the tire width deflection amount measuring device according to claim 1 or 2 is mounted on a rim of a tire mounted on a vehicle. Each of the tires is fixed at two points, and one of the tire width deflection measuring devices measures the amount of protrusion of the tire in the tire width direction at a portion receiving the contact pressure from the road surface.

Next, in the second measuring step, the other tire width deflection measuring device measures the amount of protrusion of the tire in the tire width direction at a portion not receiving the contact pressure from the road surface.

Next, in the third measuring step, the amount of deflection in the tire width direction is obtained from the difference between the amount of protrusion in the first measuring step and the amount of protrusion in the second measuring step.

By measuring the amount of tire width deflection in each of the above steps, the amount of deflection of the tire in the tire width direction can be easily measured.

In the tire load load estimating method according to the fourth aspect, a graph showing the relationship between the tire width deflection amount and the load applied to the tire is used, and the tire width deflection amount measurement method according to the third aspect is used. It is characterized in that a load acting on the tire is obtained based on the obtained tire width deflection amount.

Next, the operation and effect of the method for estimating a tire load load according to the fourth aspect will be described.

In some cases, it is necessary to determine the load acting on the tire mounted on the vehicle. In such cases,
For example, a method of attaching a device for detecting a load to a tire and measuring the load can be considered, but the measurement work lacks quickness and requires a large amount of labor.

Therefore, according to the tire load load estimating method of the present invention, by using a graph showing the relationship between the tire width flexure amount and the load load acting on the tire, the tire width flexure amount according to claim 3 is used. The load applied to the tire can be easily obtained from the tire width deflection obtained by the measuring method.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a tire width deflection measuring apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a tire width deflection amount measuring device. FIG. 2 is a state diagram in which the tire width deflection measuring device is fixed to a rim of a tire.

As shown in FIGS. 1 and 2, the tire width deflection measuring device 10 includes a base 16 for fixing the tire 12 to the rim 14. The base 16 includes a magnetic material (magnet), and is fixed to the rim 14 made of, for example, iron or the like by magnetic force.

A switch 18 is provided on the base 16. When the switch 18 is in the “ON” position, a magnetic field is generated and can be fixed to the rim 14 by the magnetic force. The rim 14 is configured to be detachable from the rim 14.

As the base 16, for example, a so-called magnet stand which is well known in the art is preferably used.

A cuboid scale bar 20 is attached to the base 16 as a whole. A scale plate 22 (tape measure) is attached to a side surface of the scale bar 20. Also, the cross section of the scale bar 20 has T
A groove 24 is formed to penetrate in the axial direction.

The scale bar 20 has a slide bar 2.
6 is provided slidably. The slide bar 26 is formed in a flat plate shape as a whole, and an end (not shown) of the slide bar 26 is formed in a T shape.
Then, by fitting this end into the T-shaped groove 24 of the scale bar 20, the slide bar 26 is
In the axial direction of FIG.
It is configured to slide while maintaining a substantially vertical angle with respect to.

An indication mark 28 is provided near the end of the slide bar 26. The movement amount of the slide bar 26, that is, the tire 12 The amount of protrusion in the width direction (the direction of arrow B in FIG. 2) can be measured.

When the rim is made of aluminum or the like, the base cannot be fixed to the aluminum rim by magnetic force. In such a case, the base may be attached to the rim by bolts or the like.

A scale plate 2 attached to the scale bar 20 as display means for displaying the amount of movement of the slide bar 26.
2 and the instruction mark 28 attached to the slide bar 26 are illustrated, but the present invention is not particularly limited thereto. For example, the movement amount of the slide bar 26 may be displayed in a digital manner as is well known in the art.

Next, a method of measuring the tire width deflection using the tire width deflection measuring apparatus of the present embodiment will be described with reference to FIG.

The tire width deflection of the tire mounted on a vehicle (such as a large dump truck) is measured by the following measuring method.

As shown in FIG. 2, first, the switch 18A of the base 16A of the one tire width deflection measuring device 10A is turned on, and the rim 14 in the vicinity of the tire 12A at the portion receiving the ground pressure from the road surface is turned on. The base 16A is fixed on a horizontal surface.

Next, the other tire width deflection measuring device 10
With the switch 18B of the base 16B of B turned ON,
The base 16B is fixed to the horizontal surface of the rim 14 near the tire 12B at a portion not receiving the contact pressure from the road surface.

Next, in order to measure the amount of protrusion of the tire 12A in the tire width direction at the portion receiving the contact pressure from the road surface,
The slide bar 26A of the tire width deflection measuring device 10A is moved in the tire width direction, and lightly contacts the most protruding portion (measurement point S) in the tire width direction on the side portion of the tire 12A. The position indicated by the indication mark 28 on the slide bar 26A at this time is indicated by the scale 2 on the scale bar 20A.
Read from 2A. The value of the scale plate 22A at this time is d1
And Thereby, the protrusion amount (first protrusion amount) of the tire 12A in the tire width direction can be measured.

Next, in the same manner, the tire width deflection amount measuring apparatus 10B measures the tire width direction protrusion amount (second protrusion amount) of the measurement point T of the tire 12B at a portion not receiving the contact pressure from the road surface. I do. The value of the scale plate 22B at this time is d
Set to 0.

As shown in FIG. 2, the measurement point T and the measurement point S are at opposite positions where the angle of 180 ° is open.

Next, the difference between the first protrusion amount d1 and the second protrusion amount d0 measured as described above is calculated, and the tire width deflection amount (d
1-d0).

The tire width deflection is a value at one side of the tire, and the value including the value at the other side is the tire width deflection 2 × (d1-
d0).

According to the above-described measuring method, it is possible to easily measure the tire width flexure of the tire mounted on the vehicle.

Next, a method for estimating the load applied to the tire from the value of the tire width deflection obtained above will be described.

Here, the tire size ORR29 / 80R
35, internal pressure 800 kPa, 700 kPa, 600 kPa
Tables 1 to 3 below show the relationship between the tire width deflection and the load applied to the tire.

[0046]

[Table 1] Table 1 above shows the relationship between the amount of deflection in the tire width when the tire internal pressure is 800 kPa and the load applied to the tire. Here, the first protrusion amount is a protrusion amount (unit: mm) in the tire width direction of the tire for each load applied to a portion receiving a contact pressure from the road surface, and the second protrusion amount is a ground contact from the road surface. The protrusion amount (unit: mm) of the tire in the tire width direction for each load applied to a portion that is not subjected to pressure. What is instrumental error?
The difference (unit: mm) is obtained by taking the difference between the first protrusion amount and the second protrusion amount and doubling the difference.

[0047]

[Table 2] Table 2 above shows the relationship between the amount of deflection in the tire width when the tire internal pressure is 700 kPa and the load applied to the tire. Here, the definitions of the first protrusion amount, the second protrusion amount, and the instrumental difference are the same as those in Table 1.

[0048]

[Table 3] Table 3 above shows the relationship between the amount of tire width deflection when the tire internal pressure is 600 kPa and the load applied to the tire. Here, the definitions of the first protrusion amount, the second protrusion amount, and the instrumental difference are the same as those in Table 1.

The instrumental differences shown in Tables 1 to 3 are deflected (m
m) on the vertical axis, and the applied load (ton) at that time
Is plotted on the horizontal axis as shown in FIG.

The load applied to the tire can be easily estimated by reading the load applied at the value of the tire width deflection measured by the above measuring method from the graph of FIG.

[0051]

According to the tire width deflection measuring apparatus and the tire width deflection measuring method of the present invention, the deflection in the tire width direction of a tire mounted on a vehicle can be easily measured with a simple configuration. .

Further, according to the tire load estimation method of the present invention, the load acting on the tire can be easily estimated.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tire width deflection amount measuring device according to an embodiment of the present invention.

FIG. 2 is a view showing a state in which the tire width deflection measuring device according to one embodiment of the present invention is fixed to a rim of a tire.

FIG. 3 is a graph showing the relationship between the amount of deflection of the tire in the tire width direction and the load applied to the tire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tire width deflection measuring device 12 Tire 14 Rim 16 Base (fixing member) 20 Scale bar (rail member) 22 Scale plate (display means) 26 Slide bar (moving member) 28 Instruction mark (display means)

Claims (4)

[Claims] 1. A tire width bending amount measuring device fixed to a rim of a tire mounted on a vehicle and measuring a bending amount of the tire in a tire width direction, wherein: a fixing member fixed to the rim; A rail member provided on a fixing member and extending in the tire width direction when the fixing member is fixed to the rim; and a moving member that moves on the rail member in the tire width direction and contacts a side portion of the tire. A display unit provided on the moving member or the rail member, for displaying a moving amount of the moving member until the moving member comes into contact with a side portion of the tire. Width deflection measuring device. 2. The tire width deflection measuring apparatus according to claim 1, wherein the fixing member is configured to include a magnetic material, and is fixed to the rim by a magnetic force. 3. The tire width deflection measuring device according to claim 1 or 2 is fixed to each of two places on a rim of a tire mounted on a vehicle, and one of the tire width deflection measuring devices is used to contact the ground pressure from a road surface. A first measuring step of measuring the amount of protrusion of the tire in the tire width direction at the part receiving the tire, and measuring the protrusion amount of the tire at the part not receiving the contact pressure from the road surface with the other tire width deflection measuring device. A second measuring step of measuring the amount of protrusion, and a third measuring step of calculating the amount of deflection in the tire width direction based on a difference between the amount of protrusion in the first measuring step and the amount of protrusion in the second measuring step. A method for measuring a tire width deflection amount, characterized in that: 4. A tire showing a relationship between a tire width deflection amount and a load applied to the tire based on the tire width deflection amount obtained by the tire width deflection amount measurement method according to claim 3. A method for estimating a load applied to a tire, comprising determining an applied load.