JP3832366B2 - Tire insertion load measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tire insertion load measuring device for measuring a load received on a tire side when a tire is inserted into a wheel.
[0002]
[Prior art]
Measuring a load applied to a tire when inserting the tire into the wheel is an important factor in considering a method of efficiently incorporating the tire into the wheel. However, since the tire is made of rubber and is greatly deformed by the load, it is difficult to directly measure the load with the tire.
[0003]
Therefore, various tire insertion load measuring methods have been conventionally used as a substitute measurement. For example, when a strain gauge is attached to a wheel and a tire is inserted into the wheel, the load received by the wheel is measured based on the magnitude of the strain detection signal output from the strain gauge. The strain output from this strain gauge when a tire gauge is attached to the mounter arm of the tire built-in equipment and the tire is inserted into the wheel. A tire insertion load measurement method (second conventional example) is known in which the load received by the mounter arm portion is measured based on the magnitude of the detection signal, and the load received by the tire is indirectly determined from the measurement result. Furthermore, when inserting a tire into the wheel, a method of measuring the load torque of a power source (motor, etc.) of the tire built-in equipment, and indirectly determining the load received by the tire from this measurement result (third conventional example), etc. It has been known.
[0004]
[Problems to be solved by the invention]
However, the conventional tire insertion load measuring method described above has the following drawbacks.
[0005]
That is, in the method according to the first conventional example, the finite element method or the like is used to specify the magnitude and direction of the load based on the magnitude of the strain detection signal output from each strain gauge attached to the wheel. Thus, the relationship between each strain and the load in each direction must be obtained in advance, and a great deal of time is required for preparation and analysis.
[0006]
Furthermore, since the strain gauge is attached to a wheel having high rigidity, there is a disadvantage that the value of the strain detection signal output from the strain gauge is small and it is difficult to obtain high measurement accuracy.
[0007]
Further, since the methods according to the second and third conventional examples are methods for measuring the magnitude of the load applied to the equipment, it is not possible to directly measure the load and direction received by the tire, and the tire load situation It is difficult to grasp accurately.
[0008]
The present invention has been made to solve such a conventional problem, and the object of the present invention is to accurately measure the load applied to the tire and its direction when the tire is inserted into the wheel. It is an object of the present invention to provide a tire insertion load measuring device capable of presenting accurate data when examining a method of incorporating a tire into a wheel.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 of the present application provides a tire insertion load measuring apparatus for measuring a load received by a tire when the tire is inserted into a wheel using the tire mounter. A lower wheel mounted on a wheel fixing base of the upper wheel, an upper wheel disposed on the lower wheel, and the lower wheel and the upper wheel so as to separate the upper wheel and the lower wheel by a predetermined distance. And a load cell arranged between the two.
[0010]
The invention according to claim 2 uses, as the upper wheel, an outer upper wheel obtained by cutting the upper wheel into a ring shape and an inner upper wheel, and the outer upper wheel and the inner upper wheel. The load cell is installed separated by a predetermined distance.
[0011]
The invention described in claim 3 is characterized in that a clearance of a predetermined dimension or more is provided between the lower end of the load cell and the lower end of the lower wheel.
[0012]
According to a fourth aspect of the present invention, the load cell is connected to the lower wheel and the upper wheel or the lower wheel, the outer upper wheel, and the inner upper wheel via a ring-shaped reinforcing plate. Features.
[0013]
According to a fifth aspect of the present invention, when an angular velocity sensor is attached to the arm of the tire mounter and the value of the strain detection signal output from the load cell is analyzed, the angular velocity output from the angular velocity sensor is integrated. The angle obtained in this way is linked to the analysis result of the distortion detection signal.
[0014]
According to a sixth aspect of the present invention, when the tire mounter is a single-arm type tire mounter, the load cells measure triaxial loads Fx, Fy, Fz, and triaxial moments Mx, My, Mz. In addition, when the tire mounter is of a double arm type, the load cell measures the biaxial loads Fx and Fz and biaxial moments Mx and Mz.
[0015]
【The invention's effect】
In the invention of claim 1, since the load generated between the upper wheel and the lower wheel is measured by the load cell when the tire is inserted into the wheel, the load received by the tire can be grasped with high accuracy. Accurate data can be obtained when considering the method of incorporating tires into wheels.
[0016]
In the invention of claim 2, since the load when the inner upper wheel is pressed and fixed and the load of the outer upper wheel when the tire is inserted into the wheel can be measured separately, the inner upper wheel is pressed. Even if it is fixed, the load received by the tire can be grasped with high accuracy, and accurate data can be obtained when examining the method of incorporating the tire into the wheel.
[0017]
In the invention of claim 3, even when various types of tire mounters such as a tire mounter of a type that presses and fixes the lower end inside the wheel are used, the measurement can be made correspondingly.
[0018]
In the invention of claim 4, since the load cell and the wheel (the inner upper wheel, the outer upper wheel, and the lower wheel) are connected using the reinforcing plate, the size of the wheel is changed. However, by appropriately changing the size of the reinforcing plate, it is possible to flexibly handle a plurality of types of wheels using the same load cell.
[0019]
In the invention of claim 5, when inserting the tire into the wheel, it is possible to measure with high accuracy how much load is applied to the tire when inserting which part of the tire. Accurate data can be obtained when considering the method of incorporating tires into wheels.
[0020]
According to the sixth aspect of the present invention, when the tire is inserted into the wheel, the load received by the tire can be measured with high accuracy by the optimum load measurement type corresponding to the number of arms of the tire mounter.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic configuration diagram showing an embodiment of a tire insertion load measuring device according to the present invention, and FIG. 2 is a cross-sectional view showing a detailed configuration of a main part of the device.
[0022]
As shown in FIG. 1, the tire insertion load measuring device 1 includes a wheel 4 including a lower wheel 13, an outer upper wheel 12, and an inner upper wheel 11, and a wheel fixing base 3 of the tire mounter 2 is provided with a wheel. 4 and a tire insertion load detector 6 having a load cell 21 for measuring the load received by the wheel 4 and the load received by the tire 5 when the tire 5 is inserted into the wheel 4 (see FIG. 2). have.
[0023]
Further, when the tire 5 is inserted into the wheel 4 while the arm 8 is rotated while being attached to the arm 8 of the tire mounter 2 and the distortion amplifier 7 that takes in and amplifies a plurality of strain detection signals output from the load cell 21. The angular velocity sensor 9 for detecting the angular velocity of the motor, the angular velocity detection signal output from the angular velocity sensor 9 and each distortion detection signal output from the distortion amplifier 7 are taken in, and the wheel is processed by a preset signal processing algorithm. And a personal computer device 10 that analyzes a load that the wheel 4 receives when the tire 5 is inserted into the tire 4 (and a load that the tire 5 receives).
[0024]
And after setting the tire 5 on the wheel 4 fixed to the wheel fixing base 3, the arm 8 of the tire mounter 2 was rotated, and when the tire 5 was inserted into the wheel 4, it was attached to the arm 8. The load received by the wheel 4 and thus the load received by the tire 5 is processed by the personal computer device 10 after the angular velocity detection signal output from the angular velocity sensor 9 and the distortion detection signal output from the load cell 21 and amplified by the distortion amplifier 7. Ask for.
[0025]
As shown in the sectional view of FIG. 2, the wheel 4 has an upper wheel and a lower wheel 13 obtained by cutting up and down at a cutting surface a, and the upper wheel is a ring at the cutting surface b. It is comprised by the inner upper wheel 11 obtained by cut | disconnecting in a shape, and the outer upper wheel 12. FIG.
[0026]
Further, a ring-shaped reinforcing plate 14 is disposed between the load cell 21 and the lower wheel 13, and a ring-shaped reinforcing plate 15 is disposed between the load cell 21 and the outer upper wheel 12. A ring-shaped reinforcing plate 16 is disposed between the load cell 21 and the inner upper wheel 11. At this time, the clearance is set so that the lower end of the lower wheel 13 is a predetermined distance L (for example, L = 60 mm) or more from the upper surface of the wheel fixing base 3 (see FIG. 1).
[0027]
Further, each reinforcing plate 14, 15, 16 has a gap 17 of about several mm between the outer upper wheel 12 and the lower wheel 13, and about several mm between the outer upper wheel 12 and the inner upper wheel 11. The gap 18 is fixed.
[0028]
The load cell 21 has a ring shape, and the bead portion 24 (FIG. 2) of the tire 5 is pressed downward by the pressing roller 20 attached to the arm 8 (FIG. 1) of the tire mounter 2. When 5 is inserted into the wheel 4, a load applied to the wheel 4 is detected, and a distortion detection signal indicating the magnitude of this load is output. Reference numeral 22 denotes a signal line for guiding each distortion detection signal output from the load cell 21 to the distortion amplifier 7.
[0029]
FIG. 3 is a perspective view schematically showing the configuration of the load cell 21. The load cell 21 has a strain generating body composed of a rigid body. The strain generating body includes four strain generating parts 21c between an outer ring part 21a and an inner ring part 21b. It is installed at the site that is distributed 90 degrees.
[0030]
The strain generating portion 21c detects strain generated between the outer peripheral ring portion 21a and the inner peripheral ring portion 21b, and 6 component forces (triaxial loads Fx, Fy, Fz, 3) applied to the wheel 4 are detected. Axial moments Mx, My, Mz) are detected, and this detection signal is output as a distortion detection signal.
[0031]
Next, the effect | action of the tire insertion load measuring apparatus 1 which concerns on this embodiment is demonstrated. First, the wheel 4 (the wheel divided into three) is installed on the wheel fixing base 3 of the tire mounter 2. Next, as shown in FIG. 1, a part of the tire 5 (left side in the figure) is set on the wheel 4 while being inclined with respect to the wheel fixing base 3.
[0032]
Thereafter, the center portion of the inner upper wheel 11 is fixed by the center control 23 of the tire mounter 2, and the arm 8 of the tire mounter 2 is rotated in this state. Then, the bead portion 24 of the tire 5 is pressed downward by the pressing roller 20 (see FIG. 2) attached to the arm 8, and the bead portion 24 is gradually attached to the wheel 4.
[0033]
At this time, the force applied between the outer upper wheel 12 and the lower wheel 13 is detected by the load cell 21, and the load received by the outer upper wheel 12, that is, the loads Fx and Y-axis directed in the X-axis direction shown in FIG. Various strain detection signals are output, including a load Fy directed in the direction, a load Fz directed in the Z-axis direction, and moments Mx, My, and Mz in each axial direction.
[0034]
As a result, for example, a distortion detection signal as shown in the characteristic curve shown in FIG. 4 can be obtained. From the figure, it is understood that when the rotation of the arm (mounter arm) 8 is started, the loads Fx, Fy, and Fz fluctuate greatly.
[0035]
The distortion detection signal output from the load cell 21 is supplied to the distortion amplifier 7 via the signal line 22 and amplified.
[0036]
In parallel with this operation, the personal computer device 10 takes in the angular velocity detection signal output from the angular velocity sensor 9 attached to the arm 8 and integrates the angular velocity detection signal to determine which part of the tire 5 is the wheel 4. The angle information indicating whether or not it has been pushed into is obtained. Furthermore, each distortion detection signal output from the distortion amplifier 7 is processed by a preset signal processing algorithm, and the loads Fx, Fy, Fz, and moment Mx in the three-axis directions based on the above-described angle information, My and Mz are analyzed. Thereby, conditions in which the rigidity of the tire 5, the mounting conditions of the tire mounter 2, the type of lubricant applied to the bead portion 24 of the tire 5 and the like are optimal can be obtained.
[0037]
In this way, in the present embodiment, the inner upper wheel 11 and the outer upper wheel 12 obtained by cutting one wheel 4 up and down at the cutting surface a and cutting into a ring shape at the cutting surface b. The lower wheel 13 is divided. Reinforcing plates 14, 15, and 16 are attached to the wheels 11, 12, and 13, and gaps 17 and 18 are formed between the inner upper wheel 11, the outer upper wheel 12, and the lower wheel 13. Thus, the load cell 21 is attached between the reinforcing plates 14, 15, 16.
[0038]
Based on the detection result obtained by the load cell 21, the wheel 4 receives the load applied by the center controller 23 and the load due to tire insertion when the tire 5 is inserted into the wheel 4. It is possible to measure the load and moment in three axes, and the load and moment in three axes that the tire 5 receives with high accuracy, thereby providing accurate data for examining the method of incorporating the tire 5 into the wheel 4. (Effect corresponding to claims 1 and 2).
[0039]
In this embodiment, since a clearance of a predetermined distance L (for example, L = 60 mm) or more is provided between the lower end of the load cell 21 and the lower end of the lower wheel 13, only the tire mounter 2 having the center control 23 is provided. In addition, the present invention can be applied to various tire mounters such as a tire mounter of a type that is fixed by pressing the inner surface of the lower end of the wheel 4 outward.
[0040]
Thereby, the tire insertion load measuring device 1 according to the present embodiment can be constructed only by attaching the tire insertion load detector 6 to the tire mounter that has already been installed. Accordingly, it is possible to save time and effort related to the improvement of the apparatus and to reduce the construction cost of the apparatus (effect corresponding to claim 3).
[0041]
In the present embodiment, the reinforcing plates 14, 15, 16 are respectively attached to the inner upper wheel 11, the outer upper wheel 12, and the lower wheel 13, and each of the reinforcing plates 14, 15 is provided by a plurality of bolts 19. 16, the load cell 21 is attached, so that the same rigidity as the actual wheel before the division can be maintained, and the sizes of the reinforcing plates 14, 15, 16 are changed according to the size of the wheel 4. Thus, the same load cell 21 can be applied to a plurality of types of wheels.
[0042]
Accordingly, it is not necessary to prepare a plurality of types of load cells that are expensive in cost (effect corresponding to claim 4).
[0043]
In the present embodiment, the angular velocity sensor 9 is attached to the arm 8 of the tire mounter 2 and is output from the angular velocity sensor 9 when the personal computer device 10 analyzes the value of each strain detection signal output from the load cell 21. Since the angle information obtained by integrating the angular velocity and the analysis result of each distortion detection signal are linked, when inserting the tire 5 into the wheel 4, any portion of the tire 5 is inserted. Data such as how much load is applied to the tire 5 can be obtained with high accuracy. Therefore, when examining the construction method for incorporating the tire 5 into the wheel 4, accurate data can be presented (effect corresponding to claim 5).
[0044]
Further, in this embodiment, a single arm type tire mounter is used as the tire mounter 2, and the loads Fx, Fy, Fz in the three axial directions and moments Mx, My, Mz in the three axial directions are measured on the load cell 21. Therefore, using a single-arm type tire mounter, necessary and sufficient load data can be obtained when the tire 5 is inserted into the wheel 4 (effect corresponding to claim 6).
[0045]
Moreover, although embodiment mentioned above demonstrated as an example the tire insertion load measuring apparatus 1 using the tire mounter 2 which equipped with the center condenser 23, this invention is about the case where the tire mounter 2 which does not mount the center condenser 23 is used. Can also be implemented.
[0046]
FIG. 5 is a cross-sectional view showing the configuration of a tire load measuring device using a tire mounter 25 that does not have a center capacitor. As shown in FIG. 5, when using a tire mounter 25 that does not have a center capacitor, Ring-shaped reinforcing plates 14 and 15 are mounted on the upper wheel 26 and the lower wheel 27 obtained by cutting the wheel 4 at the cut surface a, and a load cell is provided between the reinforcing plates 14 and 15 by a plurality of bolts 19. 21 is fixed.
[0047]
Even in such a configuration, as in the above-described embodiment, when the tire 5 is inserted into the wheel 4, the load and moment in the three axial directions that the tire 5 receives can be measured with high accuracy. When examining the construction method for incorporating the tire 5 into 4, accurate data can be presented (effect corresponding to claims 1, 3, 4, 5, 6).
[0048]
In the embodiment described above, the tire insertion load according to the present invention is exemplified by the tire mounters 2 and 25 (Japanese Patent Laid-Open No. Hei 11-192823) in which the number of the arms 8 for pushing the tire 5 into the wheel 4 is one. Although the measuring apparatus 1 has been described, the present invention is not limited to this, and a configuration using two arms 8 (FIG. 1) (Japanese Patent Laid-Open No. Hei 6-16023) may be used. good.
[0049]
Even in such a configuration, when the tire 5 is inserted into the wheel 4, a strain detection signal indicating the loads Fx and Fz applied to the wheel 4 is output from the load cell 21, and the load received by the wheel 4, and thus the tire 5 is The load to be received can be measured with high accuracy (effect corresponding to claim 6).
[0050]
In the present embodiment, as shown in FIG. 3, an example in which distortion is detected using an integrated load cell 21 having a ring shape has been described, but the present invention is not limited to this, for example, It is also possible to use a load cell divided for each of the four strain generating portions 21c of the load cell 21.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration of a tire insertion load measuring device according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a detailed configuration example of a main part of the tire insertion load detection device illustrated in FIG. 1;
FIG. 3 is an explanatory view schematically showing a load cell.
4 is a characteristic diagram showing a measurement example using the tire insertion load measuring device shown in FIG. 1. FIG.
FIG. 5 is a cross-sectional view showing a configuration example of another embodiment of the tire insertion load measuring device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tire insertion load measuring apparatus 2 Tire mounter 3 Wheel fixing stand 4 Wheel 5 Tire 6 Tire insertion load detector 7 Distortion amplifier 8 Arm 9 Angular velocity sensor 10 Personal computer apparatus 11 Inner upper wheel (upper wheel)
12 Outer upper wheel (upper wheel)
13 Lower wheel 14, 15, 16 Reinforcement plate 17, 18 Clearance 19 Bolt 20 Press roller 21 Load cell 21 a Outer ring 21 b Inner ring 21 c Strain generating part 22 Signal line 23 Center con 24 Bead part 25 Tire mounter 26 Upper wheel 27 Lower wheel

Claims (6)

In a tire insertion load measuring device for measuring a load received by the tire when inserting the tire into the wheel using a tire mounter,
A lower wheel mounted on a wheel fixing base of the tire mounter;
An upper wheel disposed on the lower wheel;
A load cell disposed between the lower wheel and the upper wheel so as to separate the upper wheel and the lower wheel by a predetermined distance;
A tire insertion load measuring device comprising: As the upper wheel, an outer upper wheel obtained by cutting the upper wheel into a ring shape and an inner upper wheel are used, and the outer upper wheel and the inner upper wheel are separated by a predetermined distance, and the load cell is used. The tire insertion load measuring device according to claim 1, wherein the tire insertion load measuring device is installed. The tire insertion load measuring device according to claim 1, wherein a clearance of a predetermined dimension or more is provided between a lower end of the load cell and a lower end of the lower wheel. The load cell is connected to the lower wheel and the upper wheel, or the lower wheel, the outer upper wheel, and the inner upper wheel via a ring-shaped reinforcing plate. 4. The tire insertion load measuring device according to any one of items 3. When the angular velocity sensor is attached to the arm of the tire mounter and the value of the distortion detection signal output from the load cell is analyzed, the angle obtained by integrating the angular velocity output from the angular velocity sensor and the distortion detection The tire insertion load measuring device according to any one of claims 1 to 4, wherein a signal analysis result is linked. When the tire mounter is a single-arm type tire mounter, the load cell measures triaxial loads Fx, Fy, Fz, triaxial moments Mx, My, Mz, and double arm type tires. 6. The load cell according to claim 1, wherein when the loader is a mounter, the load cells measure loads Fx and Fz in two axial directions and moments Mx and Mz in two axial directions. Tire insertion load measuring device.

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