JP5956385B2 - Tire durability test method and tire durability test apparatus - Google Patents

Description

  The present invention relates to a tire durability test method and a tire durability test apparatus for accelerating deterioration of a tire over time and testing the durability of the tire.

Conventionally, it is known that a tire deteriorates when exposed to ozone for a long period of time regardless of whether or not the vehicle travels, and a crack is generated on the surface of the tire. In particular, recent tires have improved wear resistance of the tread rubber, thereby extending the service life of the tire, and it is necessary to ensure the durability of the rubber in portions other than the tread rubber. Therefore, as a test for examining the durability of the tire, as shown in Patent Document 1, the tire is rotated while being pressed against the rotating drum so as to apply a load assuming the use state of the tire as the subject. Durability tests that accelerate deterioration over time by spraying ozone toward the tread surface have been conducted.
However, since ozone is sprayed toward the tread surface, only local portions in the vicinity of the tread surface are promoted for deterioration, so that the deterioration of the entire tire surface is promoted uniformly. There is a problem that deterioration over time cannot be accurately reproduced.

JP 2008-26228 A

  Accordingly, the present invention provides a tire durability test method and a tire durability test apparatus capable of accelerating tire deterioration and performing a tire durability test in the same manner as a deterioration phenomenon during actual tire use.

In the form of a tire endurance test method according to the present invention for solving the above problems, and to promote the degradation of the tire to a tire endurance test method for testing the durability of the tire while loaded with a predetermined load to the tire In the test chamber where the tire test device that rotates and reproduces the usage state is stored, ozone that promotes tire deterioration is added to the air whose temperature and humidity are adjusted by the air conditioner that adjusts the temperature and humidity in the test chamber When supplying ozone from the ozone supply device to be generated and sending it out in a mixed state of air and ozone, the amount of ozone supplied from the ozone supply device is provided at the outlet of the air conditioner, and from the outlet to the test chamber A first ozone sensor that detects the ozone concentration immediately after delivery to the tire, and a plurality of second ozone sensors that are provided to surround the tire and detect the ozone concentration in the vicinity of the tire; The ozone concentration measured by the third ozone sensor provided at a position away from the first and second ozone sensors and detecting the ozone concentration in the test chamber other than the delivery port and the vicinity of the tire becomes the predetermined ozone concentration. since so as to adjust as the ozone concentration in the test chamber becomes uniform, because the actual same environment and use tire is reproduced in the test chamber, used tires in a tire testing device provided in the test chamber conditions By reproducing the above, it is possible to carry out a tire durability test while accurately accelerating the deterioration phenomenon of the tire.
Further, as another embodiment of the tire durability test method according to the present invention, the air in the test chamber is circulated, and the temperature, humidity and ozone concentration are adjusted again and supplied to the test chamber. The time required for the control when maintaining the ozone concentration in a predetermined state can be shortened.
Further, as another form of the tire durability test method according to the present invention, since the atmospheric pressure inside the test chamber is made lower than the atmospheric pressure outside the test chamber, air containing ozone inside the test chamber can be prevented from leaking outside the test chamber.
Further, as a configuration of the tire durability test apparatus according to the present invention, a tire durability test apparatus that tests tire durability by accelerating deterioration of the tire, is housed in a test chamber partitioned from the outside, and is predetermined in the tire. a tire testing device you want to rotate. the tire while applying a load of, and the air conditioning apparatus for adjusting the temperature and humidity of the air in the test chamber, before sending the air temperature and humidity are adjusted by the air conditioner in the test chamber An ozone supply device for supplying ozone to the air; a first ozone sensor for detecting the ozone concentration immediately after delivery from the delivery port to the test chamber; A plurality of second ozone sensors for detecting the ozone concentration in the vicinity of the tire and a position apart from the first and second ozone sensors. Third and ozone sensor controls the adjustment of the temperature and humidity of the air delivered to the test chamber by the air conditioner, the first to third ozone concentration measured by the ozone sensor of a predetermined ozone for detecting the concentration The control device controls the amount of ozone supplied from the ozone supply device so that the concentration is the same, so that the ozone concentration in the test chamber is made uniform. Deterioration can be promoted and a tire durability test can be performed with high accuracy.

1 is an overall schematic view of a tire durability test apparatus according to the present invention.

  FIG. 1 is a schematic configuration diagram showing an embodiment of a tire durability test apparatus for suitably executing the tire durability test method of the present invention. As shown in the figure, a tire durability test apparatus 1 is configured by adjusting a test chamber 2 partitioned from an external space, a tire test apparatus 3 that reproduces a tire T in use, and an indoor environment in the test chamber 2. An air conditioner 4 for reproducing a desired test environment and an ozone supply device 5 for supplying ozone into the test chamber 2 to promote tire deterioration are provided.

The test chamber 2 is configured as a room that partitions an external space and an internal space. In the test chamber 2, for example, a drum testing machine is accommodated as the tire testing device 3.
The drum testing machine includes a drum 10 that is disposed substantially in the center of the test chamber 2 and reproduces a road surface, and a tire holding unit (not shown) that holds a tire T of a subject. The drum 10 is rotatably installed with its axis line turned in the horizontal direction, and the outer periphery 10a is formed in a small uneven shape such as a paved road so that a frictional force corresponding to the road surface can be obtained. The drum 10 is rotated by a driving force such as a motor and the speed thereof is controlled to reproduce the running state when the tire is used.

  The tire holding means is provided at a position facing the outer periphery 10a of the drum 10, and holds the tire T, which is the subject, as a rim and applies an internal pressure. The tire holding means includes a moving means for moving the tire T close to or away from the drum 10, and driving the moving means brings the outer periphery of the tire T into contact with the outer periphery 10 a of the drum 10. Reproduce the load acting on the tire when using the tire. The load is adjusted by the amount of movement of the moving means.

The test chamber 2 penetrates into and out of the test chamber 2, and an inflow duct 12 for flowing air into the test chamber 2, and a circulation duct 13 for circulating the air in the test chamber 2 to the air conditioner 4, The air opening duct 14 for discharging the air in the test chamber 2 is provided at a different position.
The inflow duct 12 is connected to the outlet 4 </ b> A of the air conditioner 4 provided outside the test chamber 2.
The circulation duct 13 is connected to the air intake 4B of the air conditioner 4 outside the test chamber 2, and forms a circulation path for circulating the air in the test chamber 2.
The air opening duct 14 opens and closes the air flow for opening the air containing ozone in the test chamber 2 to the atmosphere, and collects ozone contained in the air when the air flow is opened. An ozone recovery device 16 is provided.

The open / close door 15 opens the door when the air in the test chamber 2 is discharged, allows the air to flow in and out by the air opening duct 14, and stops the discharge of the air in the test chamber 2. To shut off the flow of air in and out. The air containing ozone in the test chamber 2 is configured to be able to flow into and out of the test chamber 2 through the open / close door 15. At the time of the test, the open / close door 15 is closed so that the air in the test chamber 2 containing ozone does not leak to the outside, and the test chamber 2 is configured as a closed space, thereby preventing air leakage to the outside. The opening / closing operation of the opening / closing door 15 is performed by driving a driving unit (not shown), and is operated by a signal output from the control device 100 described later.
The ozone collector 16 is provided between the open / close door 15 and the atmospheric discharge port 14A of the atmospheric opening duct 14, and collects ozone contained in the air flowing out from the test chamber 2 before being released into the atmosphere. Release air with ozone content below the specified value to the atmosphere. An ozone sensor 27 for detecting the ozone concentration contained in the air released to the atmosphere is provided in the vicinity of the atmospheric discharge port 14A. The ozone concentration detected by the ozone sensor 27 is monitored by the ozone leak monitoring device 17 connected to the ozone sensor 27.

  The air conditioner 4 is provided outside the test chamber 2 and includes a heat exchanger 20 that adjusts the temperature of air and a humidity adjuster 21 that adjusts the humidity of air. The air whose temperature and humidity are adjusted by the heat exchanger and humidity adjuster of the air conditioner 4 is sent out to the inflow duct 12 from the outlet 4A of the air conditioner 4 so as not to leak outside. The air intake 4B of the air conditioner 4 includes an outside air inlet 4C for sucking outside air and a circulating air inlet 4D to which the circulation duct 13 is connected. The air intake 4B is in a negative pressure state in which a flow toward the air conditioner 4 is generated during operation of the air conditioner 4, and air containing ozone flowing into the air conditioner 4 from the circulation duct 13 is sucked into the outside air. It connects so that it may not flow out of the opening 4C.

  The ozone supply device 5 supplies the generated ozone generated through the ozone supply pipe 22 to the inflow duct 12. For example, the ozone supply device 5 generates ozone by colliding high energy electrons and oxygen molecules by irradiating the air taken into the device with ultraviolet rays or silently discharging in oxygen. The ozone supply pipe 22 is connected between, for example, the outlet 4A of the air conditioner 4 and the outlet 12A of the inflow duct 12 so that ozone is uniformly mixed with the air sent from the air conditioner 4. In this state, it can be sent into the test chamber 2 from the outlet 12A of the inlet duct 12.

  In the test chamber 2, a temperature sensor 24 for measuring the temperature in the test chamber 2, a humidity sensor 25 for measuring humidity, and a plurality of ozone sensors 26A to 26E for measuring ozone concentration are provided. The ozone sensors 26A to 26E detect, for example, the ozone concentration immediately after being sent into the test chamber 2 by providing the ozone sensor 26A in front of the outlet 12A of the inflow duct 12, and the tire T near the drum tester. Ozone sensors 26B to 26D are provided so as to enclose, and the ozone concentration in the vicinity of the tire T is detected, and an ozone sensor 26E is provided at a location away from the ozone sensors 26A to 26D to detect the ozone concentration in places other than the above. By providing the ozone sensors 26A to 26E as described above, it is possible to grasp the presence or absence of the influence of the airflow generated by the rotation of the drum 10 and the rotation of the tire T by the operation of the drum testing machine.

Further, a door sensor for detecting the open / closed state of the doors 28; 29 is provided in the loading door 28 for loading the tire T to be inspected into the test chamber 2 and the door 29 for the entrance / exit for the inspector to enter and exit 30 are provided.
The infrared sensor 31 is attached to, for example, the ceiling of the test chamber 2 and detects the presence or absence of a person in the test chamber 2. The detection operation of the person by the infrared sensor 31 is, for example, invalidated after the start of the test, so that the temperature of the tire generated by friction with the drum 10 of the drum tester becomes the same as that of the human body, or the test chamber 2 When the temperature of the air inside is set to the same temperature as the human body, it can be prevented that a person is present in the test chamber 2.
The internal atmospheric pressure sensor 32 detects the atmospheric pressure inside the test chamber 2, and the external atmospheric pressure sensor 33 detects the atmospheric pressure outside the test chamber 2.

The control device 100 includes a drum tester, the air conditioner 4, the ozone supply device 5, the temperature sensor 24, the humidity sensor 25, the ozone sensors 26A to 26E, the door sensor 30; 30, the infrared sensor 31, the internal pressure sensor 32, and the external pressure. The air conditioner 4 adjusts the temperature and humidity of the air sent to the test chamber 2 based on the signal output from each sensor connected to the sensor 33, the humidity, the air flow rate, and the ozone supply device 5 from the test chamber 2. The test environment for the durability test of the tire T is controlled by controlling the supply amount of ozone mixed with the air sent to the tire.
The control device 100 is a so-called computer, and includes a CPU as arithmetic means provided as hardware resources, a ROM and RAM as storage means, an input / output interface as communication means, and the like. The CPU executes processing related to the tire durability test in accordance with the control program stored in the storage means. The control device 100 includes input means such as a keyboard and a mouse for inputting an endurance test environment, test status and drum tester of the endurance test, control contents of the air conditioner 4 and the ozone supply device 5, a temperature sensor 24, A display means for displaying the temperature, humidity, and ozone concentration measured by the humidity sensor 25 and the ozone sensors 26A to 26E is connected. The ozone concentration detected by the ozone sensors 26 </ b> A to 26 </ b> E is digitized via an ozone concentration detection device included in the control device 100.

Hereinafter, a test operation example of the tire durability test apparatus 1 according to the present invention will be described.
First, the tire T is assembled to the tire holding means of the drum testing machine, and air is injected into the tire T so as to have a predetermined internal pressure.
Next, when the operator operates the input means, temperature, humidity, and ozone concentration as test conditions are input to the control device 100.
When the test condition is input, the control device 100 first performs a safety check on whether there is a person in the test room 2 by the infrared sensor 31 provided in the test room 2, and if there is a person, The process is interrupted until it leaves the test room 2.
Next, when it is detected that a person is not in the test chamber 2, the control device 100 determines whether the test chamber 2 is in a sealed state, for example, in the test chamber 2 based on a signal output from the door sensor 30; 30. It is detected whether the door 28; 29 for entering and exiting is completely closed. When the opening of the door 28; 29 is detected, the fact that the door 28; 29 is open is displayed on a monitor connected to the control device 100, and the operator is prompted to close the door 28; 29.

Next, when the safety check is completed, the control device 100 adjusts the temperature and humidity of the air sent into the test chamber 2 by the air conditioner 4, and supplies the ozone generated by the ozone supply device 5 to this air. Then, air adjusted to a predetermined temperature, humidity and ozone concentration mixed with ozone in advance is sent into the test chamber 2. Specifically, the preparatory operation before the test is performed until the difference in ozone concentration detected by the plurality of ozone sensors 26A to 26E provided in the test chamber 2 is equal to or less than the threshold value and the input ozone concentration.
Next, when the control device 100 detects that the input test environment such as the temperature, humidity and ozone concentration in the test chamber 2 is satisfied, the outer peripheral surface of the tire T of the tire testing machine is changed to the drum outer peripheral surface 10a. The tire T is moved by driving the moving means so that a predetermined load is applied. Next, the endurance test is started while the deterioration of the tire T is promoted by rotating the drum 10 at the set number of rotations.

  When the tire durability test is started, the control device 100 determines whether the test start state is maintained for the temperature, humidity, and ozone concentration input from each temperature sensor 24, humidity sensor 25, and ozone sensors 26A to 26E. Determination is made to control the temperature and humidity of the air sent to the test chamber 2 by the air conditioner 4 and the amount of blown air, and the amount of ozone supplied by the ozone supply device 5. Further, along with the control of the air conditioner 4 and the ozone supply device 5, the pressure difference between the pressures output from the external pressure sensor 33 and the internal pressure sensor 32 is monitored so that the negative pressure state in the test chamber 2 is maintained. In addition, the door 15 is opened and closed to control the outflow of air from the air opening duct 14. For example, since this endurance test is performed for a long time, the tire generates heat due to friction with the drum 10 and becomes a heat source in the test chamber 2 so that the atmospheric pressure in the test chamber 2 becomes higher than the external atmospheric pressure. There is. In such a case, the opening / closing door 15 provided in the atmosphere opening duct 14 is opened, and the opening / closing door 15 is operated to be opened so that the pressure inside the test chamber 2 is lower than the outside pressure. When the open / close door 15 is opened, ozone contained in the air flowing through the atmosphere opening duct 14 is recovered by the ozone recovery device 16 and released to the outside atmosphere. At this time, since the ozone concentration in the test chamber 2 decreases, the control device 100 outputs a command to increase the amount of ozone generated by the ozone supply device 5, and the ozone mixed with the air sent from the air conditioner 4 The concentration is increased and the ozone concentration in the test chamber 2 is controlled to be constant.

  In this way, by controlling the test environment in the test chamber 2, air containing ozone other than the air opening duct 14 in the test chamber 2 does not flow out, so the entire surface of the tire T can be safely homogenized. The durability test of the tire T can be performed while promoting the deterioration.

  In the above-described embodiment, the tire testing apparatus 3 provided in the test chamber 2 has been described as a drum testing machine. However, the tire testing machine is not limited to this, and the use of tires such as a belt testing machine and a vibration testing machine. Any one may be used as long as it applies a predetermined load according to the state.

2 test rooms, 3 tire test equipment, 4 air conditioning equipment, 5 ozone supply equipment,
26A thru | or 26E ozone sensor, 100 control apparatus.

Claims (4)

A tire durability test method for testing tire durability by accelerating the deterioration of the tire, in a test chamber in which a tire test apparatus for reproducing a use state by rotating a tire while applying a predetermined load is housed, Supplying ozone from an ozone supply device that generates ozone that promotes deterioration of tires in air that has been adjusted in temperature and humidity by an air conditioner that adjusts the temperature and humidity in the test chamber, and the air and ozone When sending in a mixed state ,
The amount of ozone supplied from the ozone supply device is provided at the delivery port of the air conditioner, and surrounds the tire with a first ozone sensor that detects the ozone concentration immediately after delivery from the delivery port into the test chamber. A plurality of second ozone sensors for detecting the ozone concentration in the vicinity of the tire, and provided at a position away from the first and second ozone sensors, in a test chamber other than the outlet and the vicinity of the tire. A tire durability test method comprising adjusting a ozone concentration measured by a third ozone sensor for detecting an ozone concentration to be a predetermined ozone concentration .   The tire endurance test method according to claim 1, wherein the air in the test chamber is circulated and the temperature, humidity and ozone concentration are adjusted again and supplied to the test chamber.   The tire durability test method according to claim 1 or 2, wherein the pressure inside the test chamber is set lower than the pressure outside the test chamber. A tire durability testing apparatus for testing tire durability by promoting tire deterioration,
Housed in a test chamber which is partitioned from the outside, and the tire testing device you want to rotate. The tire while loaded with a predetermined load to the tire,
An air conditioner for adjusting the temperature and humidity of the air in the test chamber;
An ozone supply device for supplying ozone to the air before the air whose temperature and humidity are adjusted by the air conditioner is sent into a test chamber;
A first ozone sensor which is provided at the outlet of the air conditioner and detects the ozone concentration immediately after being sent from the outlet into the test chamber;
A plurality of second ozone sensors provided so as to surround the tire and detecting an ozone concentration in the vicinity of the tire;
A third ozone sensor that is provided at a position away from the first and second ozone sensors, and detects an ozone concentration in a test chamber other than the vicinity of the delivery port and the tire;
It controls the temperature and adjust the humidity of the air delivered to the test chamber by the air conditioner, as the first to the ozone concentration measured by the third ozone sensor of a predetermined ozone concentration, the ozone A control device for controlling the amount of ozone supplied from the supply device ;
A tire durability test apparatus comprising:

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