JP4169673B2 - Tire wear test method and tire wear tester - Google Patents

Description

  The present invention relates to a tire wear test method and a tire wear tester. More specifically, the present invention relates to a tire wear test method and a tire wear test machine that can prevent re-deposition of rubber powder scraped from the tire surface to the tire surface and reproduce the actual road surface running.

  In the prior art, as a method for evaluating the wear performance of a tire, a table running test method in which a drum type tire wear tester or a flat belt type tire wear tester is used instead of actual road running is adopted.

  In these wear test methods, a tire is pressed against an infinite traveling surface such as sandpaper affixed on the surface of a rotating drum or endless belt, and the remaining groove of the worn tire and its form are evaluated. .

  However, in these abrasion test methods, a phenomenon occurs in which the rubber powder scraped from the tire with sandpaper or the like adheres to the surface of the sandpaper or the like and then adheres to the surface of the tire again. Cannot be properly promoted, and there is a problem that actual road surface traveling such as asphalt cannot be accurately reproduced according to the actual situation.

To address this, by spraying the powder in which talc talc _{(3MgO · 4SiO 2 · H 2} O) on the surface of such sand paper, a method of preventing the adhesion of the rubber powder is generally employed . However, when talc is sprayed on sandpaper or the like that is in contact with the tire, a new problem arises that the talc is scattered and contaminates the environment around the tire wear tester.

  In order to solve this, a method of applying a talc suspension has been proposed. As shown in FIG. 3, the talc is applied to the running surface (sandpaper or the like) 6 of the rotating drum 3 with which the tire 4 contacts with the sprayer 7. (See, for example, Patent Document 1).

However, it may be difficult to spray talc or suspension, etc., depending on the testing machine performing the wear test, especially those used in combination with other tests. There is a problem that it is difficult to adopt the method of applying the coating.
JP-A-7-146217

  An object of the present invention is to prevent a tire powder scraped from a test tire from adhering to the surface of the test tire in a tire wear test, and to appropriately promote the wear test of the test tire. It is to provide a method and a tire wear tester.

In order to achieve the above object, the tire wear test method of the present invention is a tire wear test method using a tire wear tester for running a test tire in contact with an infinite running surface. Toward the front, from the front or rear in the direction of travel of the test tire, and supplying a wind having a temperature equal to or lower than the ambient temperature of the tire wear testing machine, and the lower edge and the upper edge of the supply air outlet At the surface position of the test tire, it is positioned within a range of 0.01 to 1 m from the infinite running surface, and the width of the outlet is set to a size within the range of 100 to 200% of the width of the test tire. The method is characterized in that the wind speed is 3 to 15 m / s .

  This tire wear test is normally performed indoors, and is performed in a state where the room temperature is controlled to be a constant temperature, for example, 25 ° C. Accordingly, the temperature around the tire wear tester is usually the room temperature, but it is not necessarily the room temperature when it is not indoors or when the room temperature changes.

  As long as the air is blown toward the tread surface, the air may be blown from any direction, but in order to increase the air blowing effect, from the front or the rear of the tire traveling direction so that the wind can easily pass through. It is preferable to blow.

  According to the present invention, by sending the wind below the temperature around the tire wear testing machine, the rubber powder generated from the tire surface with a small volume and a small heat capacity is instantaneously cooled, and the rubber powder is applied to the tire surface. The reattachment force can be eliminated, and the rubber powder can be dispersed from the tire surface by blowing.

  In addition, by blowing from a certain direction, rubber powder scattered on the wind can be collected in a certain direction, and since talc and talc suspension are not used, contamination of the environment around the tire wear tester Can be prevented.

  In this tire wear test method, the wind speed of the wind at the surface position of the test tire is 3 m / s to 15 m / s, preferably about 5 m / s, or the wind volume is equal to or greater than the product of the tire projected area of the test tire and the wind speed. It is preferable that the wind blowing port is installed within a range of 0.01 m to 1 m from the tire running surface, and the wind blowing width is set to a range of 100% to 200% of the width of the test tire. As a result, the reattachment of the rubber powder can be prevented more efficiently.

  If the wind speed is slower than 3 m / s, the amount of air is not sufficient to obtain the effect of preventing the reattachment of rubber powder. If the wind speed is faster than 15 m / s, the rubber powder is reattached for the energy required for blowing. The effect of prevention is reduced, rubber powder is scattered, and workability is deteriorated.

  Also, if the lower limit of the wind outlet position is lower than 0.01 m from the tire running surface, the contact surface between the tire and the running surface will be affected, and if the upper limit of the wind outlet position is higher than 1 m. The rubber powder is easily scattered from the tire tread surface, which causes a problem of environmental pollution.

  When the blowing width of the wind is smaller than 100% of the width of the test tire, a portion where the wind does not hit is generated. When the wind blowing width is larger than 200%, the amount of wind that does not hit the test tire increases, and wasteful ventilation is generated. Become more.

The tire wear test machine of the present invention for achieving the above object, the filter unpleasant abrasion tester was run in contact with the test tire on the endless running surface, towards the tread surface of the test tire the running The test tire has a blowout port for supplying wind having a temperature equal to or lower than the ambient temperature of the tire wear tester from the front or rear in the traveling direction of the test tire, and the endless running of the lower and upper edges of the blowout port. The wind speed at the surface position of the test tire is set such that it is located within a range of 0.01 to 1 m from the surface, and the width of the outlet is in the range of 100 to 200% of the width of the test tire. It is provided with a blower configured to be 3 to 15 m / s .

  In the tire wear tester described above, the wind speed of the wind at the surface position of the test tire is 3 m / s to 15 m / s, preferably about 5 m / s, or the wind volume of the test tire is projected to the tire projected area and wind speed. Or the height on the running surface of the air outlet of the blower is in the range of 0.01 m to 1 m, and the width of the air outlet is 100% to 200% of the width of the test tire. By making the range, it is possible to more efficiently prevent the rubber powder from reattaching to the test tire.

  According to the tire wear test method and tire wear tester of the present invention, in the tire wear test, a sufficient volume of air is sent to the test tire during running rotation, so that the rubber powder generated from the tire surface layer is instantaneously generated. It is possible to eliminate the reattachment force of the rubber powder to the tire surface by cooling to the tire surface, so that the rubber powder scraped from the test tire can be prevented from reattaching to the surface of the test tire. The test can be performed properly.

  Therefore, the wear of the tire on the actual road surface can be reproduced more faithfully by preventing the rubber powder from reattaching to the test tire by a simpler method of blowing cool air. In addition, since no talc or talc suspension is used, contamination of the test environment can be prevented.

  Hereinafter, a tire wear test method and a tire wear tester according to an embodiment of the present invention will be described with reference to the embodiment shown in FIGS. 1 and 2, taking a flat belt type tire wear tester as an example.

  As shown in FIG. 1, the tire wear testing machine 10 includes a bed 11, a tire support device 15 that rotatably supports a test tire 14 provided on the bed 11, and a gantry provided on the bed 11. The rotating drums 13 and 13 are rotatably supported by 12 and 12. On the endless belt 17 stretched between the pair of rotating drums 13 and 13, a sandpaper 16 for simulating the ground friction of the actual road surface for running test is attached to form the running surface 16. .

  The tire support device 15 has a drive device that rotationally drives the test tire 14 and is provided so as to be swingable. The tire support device 15 is placed on the running surface 16 with a predetermined rotational speed or pressure depending on each test. It is configured so that it can be pressed by an angle or pressing force. A rubber powder receiver 19 is provided below the rotary drum 13 on the downstream side, and receives the rubber powder 18 shaved from the test tire 14.

  And in this invention, as shown in FIG.1 and FIG.2, the wind A below the temperature (room temperature) of the circumference | surroundings of the tire abrasion testing machine 10 is made to the test tire 14 toward the tread surface of the test tire 14 to drive | work. An air blower 20 is provided to send from one direction from the front to the rear. This wind direction is preferably blown from the front or rear in the tire traveling direction so that the air A can easily pass through.

The air blower 20 is configured such that the wind speed at the surface position of the test tire 14 can be in the range of 3 m / s to 15 m / s, preferably around 5 m / s. As a result, the balance between the effect of preventing re-adhesion of rubber powder and the energy required for blowing is improved, and the scattering of rubber powder and the deterioration of workability are prevented.

Further, the air volume A (m ³ / s) can be set to be equal to or greater than the product (A = D × V) of the tire projected area D (m ² ) and the wind speed V (m / s) of the test tire 14. To do. Thereby, air (and oxygen) can be sufficiently supplied to the tread surface of the test tire 16, and fluidization of the tread surface can be prevented.

Further, each of the lower edge and the upper edge of the outlet 21 of the air A, a range of 0.01m~1m the height H of the running surface 16, and subject the tire width B of the outlet 21 of the air A The width Bt of 14 is in the range of 100% to 200%. Thereby, in the width direction of the test tire 14, it can prevent that the part which a wind does not hit arises, and can avoid that the quantity of the useless wind which does not hit the test tire 14 increases.

  Further, depending on the scattering state of the rubber powder 18, as shown in FIG. 1, a dust collection duct 19 is provided in the path of the wind A behind the test tire 14 to collect the rubber powder 18 carried by the wind A. To be configured.

  Next, the tire wear test method of the present invention using the tire wear tester 10 will be described.

After the test tire 14 is held by the tire support device 15 and the sandpaper 16 simulating an actual road surface is attached to the outer peripheral surface of the rotating drum 13, the test tire 14 is sandpaper (running at a predetermined angle and a predetermined pressing force) Surface) 16, the test tire 14 is rotated in the direction of the arrow at a predetermined rotational speed, and the wear test is started. As the test tire 14 rotates, the endless belt 17 and the sandpaper 16 move in the direction of the arrow, and the rotary drums 13 and 13 also rotate in the direction of the arrow.

  Immediately before or immediately after the start of the wear test, a wind at a temperature around the tire wear test machine 10 (room temperature) or less is sent from a certain direction toward the tread surface of the rotating test tire 14 from the blower 20.

  The air blowing is performed by setting the wind speed at the position of the test tire 14 to 3 m / s to 15 m / s, preferably about 5 m / s, and the air volume A is the product of the tire projection area D of the test tire 14 and the wind speed V ( A = D × V) or more, and by these, it is possible to send to the tread surface of the test tire 14 a wind speed sufficient for cooling and a sufficient amount of wind A to prevent fluidization of the tread surface. The rubber powder 18 having a small volume generated from the tire surface layer is instantaneously cooled, and the reattachment force of the rubber powder 16 to the tire surface can be eliminated.

  Thereby, in the tire wear test, the rubber powder 18 scraped off from the test tire 14 can be prevented from reattaching to the surface of the test tire 14, and the tire wear test can be appropriately performed.

  1 and 2 show an example in which the endless belt 17 is used as a running surface. However, the present invention can be applied to other infinite running surfaces such as a drum-type tire wear tester having an outer peripheral surface of a rotating drum as a running surface. The present invention can also be applied to a tire wear test method and a tire wear tester that run on the vehicle.

  According to the tire wear test method of the present invention, in a pneumatic tire having a tire size of 245 / 40ZR18 93W, air pressure is 235 kPa, load is 5000 N, and room temperature is 25 ° C. The vehicle travels about 200 km at a rotational speed corresponding to 60 km / h in a state where braking / sliding angle is added, and the result shows that wear progresses at both the center and the shoulder of the test tire, and the amount of wear is large.

  In this abrasion test, in the comparative example without blowing, although the test was performed under the condition that the tread surface temperature was suppressed to about 40 ° C. at the maximum, fluidization of the tread was conspicuous in the tire after the abrasion test. In the center part, the worn rubber powder stuck to the tread surface and showed a tendency to differ greatly from the marketed wear form. The surface of the tread after the abrasion test was sticky and sticky due to re-adhesion of rubber powder even though the surface temperature was relatively low, and this sticky state continued even after several days.

  On the other hand, in the example with air blowing, there is a relation of the test time, the temperature of the tire before the test is high, the temperature reaches a maximum of 45 ° C. during the test, and it is considered that it is disadvantageous for fluidization of the tread surface. First, the tire tread surface after the abrasion test felt dry and had very little sticky rubber powder.

1 is a configuration diagram of a tire wear tester according to an embodiment of the present invention. It is explanatory drawing which shows typically the condition of the ventilation of this invention. It is a perspective view which shows an example of the drum type tire abrasion tester for enforcing the tire abrasion test method which sprays the talc suspension liquid of a prior art.

Explanation of symbols

10 Tire Wear Tester 14 Test Tire 16 Sandpaper (Infinite Traveling Surface)
17 Endless belt 18 Rubber powder 20 Blower 21 Blower

Claims (2)

In a tire wear test method using a tire wear tester that makes a test tire run in contact with an infinite running surface,
A wind having a temperature equal to or lower than the ambient temperature of the tire wear tester is supplied from the front or rear in the traveling direction of the test tire toward the tread surface of the running tire. The lower edge and the upper edge are located within a range of 0.01 to 1 m from the endless running surface, and the width of the outlet is set to a size within a range of 100 to 200% of the width of the test tire. , tire wear test method wind speed at the surface position of the test tire was set to be 3~15m / s. In Ruta ear abrasion tester was run in contact with the test tire on the endless running surface,
A blowout port for supplying wind having a temperature equal to or lower than the ambient temperature of the tire wear tester toward the tread surface of the running test tire from the front or rear in the traveling direction of the test tire. The lower edge and the upper edge of the tire are positioned within a range of 0.01 to 1 m from the endless running surface, and the width of the outlet is set to a size within a range of 100 to 200% of the width of the test tire. Te, tire wear tester wind speed at the surface position of the test tire was provided with a blowing device was set to be 3~15m / s.

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