JP4826443B2 - Adjustment method of tire indoor running test machine - Google Patents

Description

  The present invention relates to a method for adjusting a tire indoor running test machine, and more particularly to a method for adjusting a tire indoor running test machine that improves the test accuracy.

  As a tire indoor running test machine for examining the performance of a pneumatic tire, for example, a tire durability testing machine of a type provided with a rotating drum for rotating a test tire is well known (for example, see Patent Documents 1 and 2). In some cases, a plurality of such tire durability testing machines are used to perform a durability test on a plurality of pneumatic tires under the same traveling conditions. At that time, the air conditioning equipment is usually adjusted so that the ambient temperature of the testing machine detected by the sensor at a position approximately 1 m away from the test tire is at the same temperature level, and the temperature at the time of testing in a plurality of tire durability testing machines The conditions are aligned.

  On the other hand, when performing a durability test under the same running condition with a single tire durability tester installed at the same place in the summer and winter, for example, with a plurality of pneumatic tires at time intervals, the same as above The temperature conditions are made uniform.

However, despite the tires having the same specifications, the test results often vary greatly, and there has been a strong demand for improvement measures.
JP 57-161634 A Japanese Patent Laid-Open No. 2005-180953

  An object of the present invention is to provide a method for adjusting a tire indoor running tester that can improve variation in test results in a tire indoor running test and increase test accuracy.

  The method for adjusting a tire indoor running test machine according to the present invention that achieves the above object is to use a tire for adjustment when a plurality of pneumatic tires are tested under the same running condition by a plurality of tire indoor running test machines. A method of adjusting a running test machine, wherein the tire temperature during running when the adjustment tire is run by one of the plurality of tire indoor running test machines is measured, and the adjustment tire is left Adjusting the ambient temperature around the remaining tire indoor running test machines so that the tire temperature during running is at the same temperature level as the measured tire temperature when running on each of the tire indoor running test machines. It is characterized by.

  According to another adjustment method for a tire indoor running test machine of the present invention, when a plurality of pneumatic tires are tested under the same running condition by a single tire indoor running test machine at time intervals, the adjustment tire is used. A method for adjusting a tire indoor running test machine, wherein the tire temperature during running when the adjustment tire is run by the tire indoor running test machine is measured, and the adjustment tire is set at a time interval. The ambient temperature around the tire indoor running test machine is adjusted so that the tire temperature during running is the same as the measured tire temperature when running with the tire indoor running test machine. And

  According to the above-described present invention, the adjustment tire is used to adjust the ambient temperature around the tire indoor running test machine so that the tire temperature during running of the tire indoor running test machine is at the same temperature level. It is possible to prevent the tires from having the same temperature level when the test is performed under the same running condition, and to generate large variations in the tire temperature. Therefore, it is possible to avoid the occurrence of large variations in the test results and improve the test accuracy in the tire indoor running test.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an embodiment of an adjustment method for a tire indoor running test machine according to the present invention. This adjustment method is used when a plurality of pneumatic tires are tested under the same running condition by a plurality of tire indoor running test machines. The tire indoor running tester is adjusted using the adjustment tire.

  FIG. 1 shows an example in which two tire durability testing machines are used as a plurality of tire indoor running test machines, where 1 is a first tire durability testing machine, 2 is a second tire durability testing machine, Adjustment tire, 4 is a room in which the first tire durability tester 1 is installed, 5 is a room in which the second tire durability tester 2 is installed, and 6 and 7 are temperature adjustments in the rooms 4 and 5. Air conditioning equipment 8 and 9 are temperature sensors for measuring the surface temperature of the adjusting tire 3, and 10 and 11 are ducts of the air conditioning equipment 6 and 7.

  Hereinafter, an embodiment of a method for adjusting a tire indoor running test machine of the present invention will be described with reference to FIG.

  First, the adjustment tire 3 that is assembled with a rim and filled with a predetermined air pressure is mounted on the tire durability tester 1 in the room 4 that has been temperature-controlled in advance by the air conditioning equipment 6. An example in which the adjustment tire 3 is attached to the first tire durability testing machine 1 and the other tire durability testing machine 2 is matched with the first tire durability testing machine 1 as a reference is shown. The adjustment tire 3 may be attached to the second tire endurance tester 2, and another tire endurance tester 1 may be matched with the second tire endurance tester 2 as a reference. Decide on the basis of one unit and attach it to it.

  Subsequently, a predetermined load is applied to the adjustment tire 3, the rotating drum 1 </ b> A is rotated, and the adjustment tire 3 is rotated on the rotating drum 1 </ b> A at a constant speed. The rotational speed is preferably a constant speed for easy adjustment, but may be a variable speed. The running time is 30 minutes or longer, preferably 1 hour or longer in order to stabilize the temperature.

  While the adjustment tire 3 is traveling, the surface temperature of the adjustment tire 3 is measured by the temperature sensor 8. The tire temperature is proportional to the product of the load load and the speed, and when the load applied to the adjustment tire 3 is constant and the rotation speed of the rotating drum is constant, the tire that has risen to a predetermined temperature maintains its temperature level. .

  After traveling, the adjustment tire 3 is removed from the tire durability testing machine 1. Before attaching to the second tire durability tester 2, the adjustment tire 3 is cooled to the same temperature as before attaching to the first tire durability tester 1. After setting the same temperature, the air pressure in the adjusting tire 3 is set to the same air pressure as that before attaching to the first tire durability testing machine 1. That is, the adjustment tire 3 is brought into the same state as before being attached to the first tire durability tester 1.

  Next, the adjustment tire 3 is mounted on the remaining second tire durability tester 2. The same load load as that applied by the first tire durability testing machine 1 is applied to the adjustment tire 3, and the rotating drum 2A is rotated to rotate the adjusting tire 3 on the rotating drum 2A. Rotate at the same speed as machine 1.

  While the adjustment tire 3 is traveling, the surface temperature of the adjustment tire 3 is measured by the temperature sensor 9. The air conditioning equipment 7 is adjusted so that the measured value becomes the same temperature level as the tire surface temperature measured by the temperature sensor 8, and the temperature in the room 5 (atmosphere temperature, air volume, etc. around the tire durability test machine) is adjusted. adjust. Under these adjusted conditions, a plurality of pneumatic tires having the same specifications can be subjected to a durability test using the two tire durability testers 1 and 2.

  Examples of the adjustment by the air conditioning equipment 7 include the temperature of the air supplied from the duct 11, the direction of the air supplied from the duct 11 into the room 5, and the speed of the air supplied from the duct 11.

  When there are three or more tire durability testing machines, the remaining tire durability testing machines are adjusted in the same manner as the second tire durability testing machine.

  When the present inventor performs a durability test of a plurality of pneumatic tires having the same specification under the same traveling condition using a plurality of tire durability testing machines, a large variation occurs in the test result despite the tire having the same specification. As a result of earnest research on the points, the following was found.

  In tests using multiple tire durability testers installed indoors, there is no problem as long as the tire durability tester installation conditions are exactly the same. If the position of the duct that blows out the air and the position of the sensor that detects the ambient temperature with respect to the duct differ, adjust the air conditioning equipment so that the ambient temperature of the testing machine detected by the sensor at the position 1 m away from the test tire is the same temperature level Even so, it was found that the temperature difference occurred because the test tires of the same specification tested under the same running conditions did not have the same temperature.

  On the other hand, in a tire durability test that gradually tightens the driving conditions, the higher the temperature of the running test tire, the greater the decrease in air pressure, and the greater the decrease in air pressure, the longer the tire failure occurs. The mileage is shortened. Therefore, despite the tires having the same specifications tested under the same running conditions, the test results varied greatly.

  Therefore, in the present invention, as described above, the tire temperature during traveling when the adjustment tire 3 is traveled by one tire durability tester 1 of the plurality of tire durability testers 1 and 2 is measured, Next, when the same adjustment tire 3 is run by the remaining tire durability tester 2, the air conditioning equipment 7 is adjusted, and the temperature of the adjustment tire 3 during running is the same as the tire temperature measured by the tire durability tester 1. The ambient temperature around the remaining tire durability tester 2 is adjusted so as to reach the temperature level. As a result, it becomes possible to make the tire temperature at the same level when performing a durability test of a plurality of pneumatic tires of the same specification using a plurality of tire durability testing machines 1 and 2 under the same traveling condition, It is possible to avoid large variations in test results. Therefore, the test accuracy can be improved.

  FIG. 2 shows another embodiment of a method for adjusting a tire indoor running test machine according to the present invention. In this adjustment method, when a plurality of pneumatic tires are tested under the same running condition with a single tire indoor running tester at time intervals, the adjustment tire is used to run in the tire in the same manner as described above. It adjusts the testing machine. In the figure, 21 is a tire durability tester, 22 is a tire for adjustment, 23 is a room in which a tire durability tester is installed, 24 is an air conditioning system for adjusting the temperature in the room 23, and 25 is a surface of the tire 22 for adjustment. A temperature sensor 26 for measuring temperature is a duct of the air conditioning equipment 24.

  In the adjustment method of the tire indoor running test machine according to the present invention shown in FIG. Attach to machine 21. Subsequently, a predetermined load is applied to the adjustment tire 22, the rotating drum 21 </ b> A is rotated, and the adjustment tire 22 is rotated on the rotating drum 21 </ b> A at a constant speed. The rotational speed is preferably a constant speed as described above, but may be a variable speed. The running time is the same as above. While the adjustment tire 22 is traveling, the surface temperature of the adjustment tire 22 is measured by the temperature sensor 25. After the running, the adjustment tire 22 is removed from the tire durability tester 21.

  At the same time (for example, the previous time is summer and this time is winter), the tire 22 for adjustment used last time is in the same state as before (the same air pressure and tire temperature), and the same tire durability tester Attach to 21. The same load load as that of the previous time is applied to the adjustment tire 22, the rotating drum 21A is rotated, and the adjustment tire 22 is rotated on the rotating drum 21A at the same constant speed as the previous time.

  While the adjustment tire 22 is traveling, the surface temperature of the adjustment tire 22 is measured by the temperature sensor 25. The air conditioner 24 is adjusted so that the measured value becomes the same temperature level as the tire surface temperature measured by the temperature sensor 25 last time, and the temperature in the room 23 (the ambient temperature around the tire durability tester, the air volume, etc.) Adjust. Under this adjusted condition, the endurance test of the pneumatic tire of the same specification is made possible. Adjustment by the air conditioning equipment 24 is the same as described above.

  Even when there is a time interval such as when the test by the tire durability tester 21 installed indoors is performed in different seasons, the temperature of the tire of the same specification to be tested under the same running condition does not become the same. There may be differences, which caused large variations in test results. Therefore, in the adjustment method of the tire indoor running test machine of the present invention shown in FIG. 2, the tire temperature during running when the adjusting tire 22 is run by the tire durability testing machine 21 is measured, and the tire temperature is measured at intervals. When the adjustment tire 22 is driven by the same tire durability tester 21, the atmospheric temperature of the tire durability tester 21 is adjusted so that the temperature of the running tire is the same as the previously measured tire temperature. It was.

  This makes it possible to maintain the tire temperature at the same level when testing is performed under the same running condition by one tire durability tester 21 installed at the same place at time intervals such as summer and winter. As a result, it is possible to avoid the occurrence of large variations in test results and to improve test accuracy.

  In the present invention, the surface temperature is used as the tire temperature in the above embodiment, but the temperature in the tire cavity may be used instead. Preferably, the temperature in the tire cavity that greatly contributes to durability can further improve variation in test results.

  Preferred examples of the sensor for measuring the tire surface temperature include an infrared thermometer and a thermography (infrared thermal imaging device). In order to measure the temperature in the tire cavity, a device that unitizes the temperature sensor and the transmission means for transmitting the temperature detected by the temperature sensor to the outside is arranged in the tire cavity, or a valve hole for filling air There is a technique such as inserting a thermocouple into the tire cavity. The temperature in the tire cavity is preferably the temperature on the rim in the tire cavity, which enables a stable temperature measurement.

  In the above embodiment, an example of a tire durability tester is given as an example of a tire indoor running tester. However, the present invention is not limited thereto, and any tester that runs a tire indoors can be applied. For example, it may be a testing machine that examines rolling resistance while rotating a tire on a rotating drum.

  In the present invention, when a plurality of pneumatic tires of the same specification are tested under the same running condition by a plurality of tire indoor running test machines, or at a time interval, the same running condition is obtained by one tire indoor running test machine. Although it can be preferably used when performing the test below, it can also be used when a plurality of pneumatic tires having different specifications are similarly tested. Further, the adjustment tire may be a tire having the same specifications as the plurality of pneumatic tires or a tire having different specifications.

It is explanatory drawing which shows one Embodiment of the adjustment method of the tire indoor running test machine of this invention. It is explanatory drawing which shows other embodiment of the adjustment method of the tire indoor running test machine of this invention.

Explanation of symbols

1, 2 Tire endurance tester (Tire interior tester)
3 Tires for adjustment 4, 5 Rooms 6, 7 Air conditioning equipment 8, 9 Temperature sensor 21 Tire durability tester (tire indoor running tester)
22 Adjustment tires 23 Rooms 24 Air conditioning equipment 25 Temperature sensors

Claims (5)

When testing a plurality of pneumatic tires with a plurality of tire indoor running test machines under the same running conditions, a method for adjusting the tire indoor running test machine using an adjustment tire,
Measure the tire temperature during running when the adjustment tire is run by one of the plurality of tire indoor running test machines,
When the tires for adjustment are run on the remaining tire indoor running test machines, the temperature of the running tire becomes the same temperature level as the measured tire temperature. A method for adjusting a tire indoor running test machine that adjusts the atmospheric temperature. A method for adjusting a tire indoor running test machine using an adjustment tire when testing a plurality of pneumatic tires with a single tire indoor running test machine at the same time under the same running conditions,
Measure the tire temperature during running when the adjustment tire is run with the tire indoor running test machine,
When the adjustment tire is run on the tire indoor running test machine at a time interval, the tire indoor running test machine is surrounded so that the running tire temperature is the same as the measured tire temperature. Adjustment method of the tire indoor running test machine to adjust the ambient temperature of the tire.   The method for adjusting a tire indoor running test machine according to claim 1, wherein the tire temperature is a tire surface temperature.   The method for adjusting a tire indoor running test machine according to claim 1 or 2, wherein the tire temperature is a temperature inside the tire cavity.   The method for adjusting a tire indoor running test machine according to claim 1, 2, 3, or 4, wherein the test is an endurance test.

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