JP2006047075A - Abrasion test method and device for tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abrasion test method for a tire and an abrasion test device for a tire capable of reproducing properly and precisely an abrasion situation of the tire generated in general travel, in a tire abrasion test. <P>SOLUTION: This abrasion test method for a tire is carried out by providing an abrasion powder removing mechanism sliding-contacting in a tread part other than a tread of the tire, when carrying out the traveling abrasion test for the tire while traveling on a road surface or a virtual road surface, applying a load onto a tire shaft. This abrasion test device for a tire has a mechanism for imparting the load onto the tire shaft of the tire traveling on the road surface or the virtual road surface, and the abrasion powder removing mechanism provided slide-contactingly in the tread part other than the tread of the traveling tire. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tire wear test method and a wear test apparatus.

  Conventionally, as a method for accelerating and evaluating tire wear, a method of running with higher severity than actual usage conditions in an actual vehicle, or a drum type tire wear tester or a flat belt tire wear tester instead of running on an actual road surface was used. There is a test method for tabletop running.

  Such a tire wear test is performed in order to evaluate the remaining grooves and the form of the worn tire.

  However, the test method as described above increases the sliding area of the tire ground contact surface, and the rubber powder generated by wear is highly sticky and does not easily fall off the tire. As a result, tire wear cannot be promoted properly, and it is difficult to say that a highly accurate wear test that faithfully reproduces general running has been performed.

  In order to improve these points and to prevent wear rubber from sticking and perform a highly accurate wear test, wear in the tire indoor tread test where the tire tread is tested by rotating the road surface and the tire under pressure. In the rubber adhesion preventing method, a mixed powder comprising at least a first adhesion preventing powder for preventing the abrasion rubber from adhering to the tire and a second adhesion preventing powder for preventing the abrasion rubber from adhering to the road surface is mixed with the road surface. In addition, there has been proposed a method for preventing adhesion of wear rubber in an indoor wear test of a tire, which is applied to the tire and prevents the wear rubber generated by the wear test from being attached to the road surface and the tire (Patent Document 1).

  However, in the invention described in Patent Document 1, two types of anti-adhesion powders are used, and management is complicated, and there are new problems such as powder discharge.

  The purpose of the present invention is to provide a tire wear test method capable of preventing dust contamination associated with the wear test, simplifying the test equipment, and faithfully reproducing the tire wear on the actual road surface. A method of applying a suspension of talc by a sprayer on a safety walk that comes into contact with a tire has been proposed (Patent Document 2).

  However, in the invention described in Patent Document 2, it is difficult to spray water, talc, or the like depending on the testing machine because of the configuration of the apparatus, and this is not a fundamental solution.

On the other hand, although a dust removing device having a rotating brush that can be used in the film manufacturing industry and the paper manufacturing industry has been proposed (Patent Document 3), the dust removing device proposed in Patent Document 3 is specially used for tire wear. It was not related to.
Japanese Patent Laid-Open No. 7-20029 JP-A-7-146217 JP-A-10-309541

  In view of the above-described points, the present invention provides a tire wear test method capable of appropriately and accurately reproducing the wear form of a tire that occurs during general running in a tire wear test. An object of the present invention is to provide a running wear test apparatus.

The tire running wear test method of the present invention that achieves the above-mentioned object has the following configuration (1).
(1) When performing a running abrasion test on a tire by running on a road surface or a virtual road surface while applying a load to the tire shaft, a wear powder removing mechanism is provided in sliding contact with a tread portion other than the ground contact surface of the tire. A tire running wear test method characterized in that

Further, in the tire running abrasion test method of the present invention, more preferably, the tire has the following specific configurations (2) to (5).
(2) The tire running wear test method according to (1) above, wherein a fixed brush or a rotating roller brush is used as a wear powder removing mechanism provided in sliding contact with the tread portion.
(3) The tire running wear test method as described in (2) above, wherein the fixed brush or the rotating roller brush is a brush composed of a metal wire.
(4) The running wear test method for a tire according to (3) above, wherein the metal wire forming the brush has a metal wire diameter of 0.2 to 0.6 mm and a metal wire length of 20 to 30 mm.
(5) The running wear test of the tire is performed while blowing wind at a temperature equal to or lower than the ambient ambient temperature on the tread surface of the running tire from at least one direction, (1), (2), (3) or (4) The tire running wear test method described in the above.

In addition, the tire running wear test apparatus of the present invention that achieves the above-mentioned object has the following configuration (6).
(6) A mechanism for applying a load to the tire shaft of a tire traveling on a road surface or a virtual road surface, and a wear powder removing mechanism provided so as to be slidable on a tread portion other than the ground contact surface of the traveling tire. A tire running wear test apparatus characterized by the above.

Further, the tire running wear test apparatus of the present invention preferably has the following specific configurations (7) to (11).
(7) The tire running wear test apparatus according to (6) above, wherein the wear powder removing mechanism provided so as to be slidable on the tread portion is a fixed brush or a rotating roller brush.
(8) The tire running wear test apparatus according to (6) or (7) above, which has a mechanism for adjusting a pressing force when the wear powder removing mechanism is brought into sliding contact with the tread portion of the tire.
(9) The tire wear test apparatus according to (6), (7) or (8) above, which has a mechanism for cooling the wear powder removing mechanism.
(10) The tire wear test apparatus according to (6), (7), (8) or (9) above, wherein the wear powder removing mechanism is a fixed brush or a rotating roller brush.
(11) The above (6), (7), (8), (9) or (9), wherein the wear powder removing mechanism is surrounded by a duct and has an air suction mechanism for sucking the wear powder through the duct. (10) The tire wear test apparatus according to (10).

  According to the first aspect of the present invention, there is provided a tire wear test method capable of appropriately and accurately reproducing the wear form of a tire that occurs during general running in a tire wear test.

  According to the sixth aspect of the present invention, there is provided a tire wear test apparatus capable of accurately and accurately reproducing the wear form of a tire that occurs during general running in a tire wear test.

  Hereinafter, the present invention will be described in more detail.

  The tire running wear test method according to the present invention provides a wear powder removing mechanism for a tread other than the ground contact surface of a tire when running a tire on a road surface or a virtual road surface while applying a load to a tire shaft. It is characterized by being provided in sliding contact with the part.

  According to the method of the present invention, the abrasion powder generated in the test under the condition that promotes tire wear (running under running conditions with a large slip area in the ground) is highly sticky and adheres to the tire. However, it is possible to easily remove such abrasion powder and to make it possible to accurately grasp the wear state of the original tire tread portion, and to perform a more accurate wear test. It will be possible.

  A tire wear test apparatus according to the present invention suitable for carrying out the running wear test method of the present invention includes a mechanism for applying a load to a tire shaft of a tire traveling on a road surface or a virtual road surface, and the traveling It has an abrasion powder removing mechanism provided so as to be slidable in contact with a tread portion other than the ground contact surface of the tire.

  In the method and apparatus of the present invention, the abrasion powder removing mechanism can be specifically configured using, for example, a brush, a spatula, or a blade. The wear powder removing mechanism has a role of sliding the tire tread surface to remove the wear powder, but is preferably configured so as not to wear the tire by the sliding contact itself.

  As a specific configuration of the abrasion powder removing mechanism, it is preferable to use a fixed brush or a rotating roller brush in which a metal wire is implanted. This is because it can sufficiently follow some irregularities of the tire tread surface caused by the adhesion of the wear powder, and can exhibit a finer and more precise wear powder removing effect than the above-described spatula or blade.

  1 to 3 are schematic conceptual diagrams schematically showing an example of a state in which a running wear test is carried out by the tire running wear test method of the present invention.

  FIG. 1 shows a case where the tire running wear test method of the present invention is carried out in an actual vehicle, wherein 1 is a tire, 2 is a fixed brush-like wear powder removing mechanism, and 3 is an automobile body. The traveling road surface 4 may be an actual road, or may be a wear test road that is particularly provided for a tire wear test. Further, it may be an endless belt that moves at high speed in accordance with the traveling speed of the automobile.

  The virtual road surface referred to in the present invention refers to a travel surface provided as a travel surface other than the actual road surface, such as the endless belt.

  Also, the load applied to the tire shaft should be set appropriately according to the desired running wear test, such as the same as the load applied to the tire during normal car driving or larger than the load during normal driving. That's fine.

  At the time of a test using an actual vehicle as shown in FIG. 1, a rotating wear powder removing mechanism is difficult to install, so a fixed type is preferable.

  FIG. 2 shows a case where a running wear test of a tire is performed on an endless belt 4 'moving at a high speed. At this time, it is preferable to use the fixed brush 2 as shown in FIG. 2 or the roller brush 2 'rotating as shown in FIG.

  As shown in FIG. 2 or FIG. 3, when a test is performed without using an actual vehicle, the test may be performed by covering the periphery of the tire using a fake body cover that simulates the vehicle body. The adhesion of the wear powder to the tire also depends on the air flow during the actual driving of the automobile. From this, it is such a test to cover the tire part three-dimensionally with a cover simulating the vehicle body. This is because it can be created by imitating the air flow.

  The wear powder removing mechanism may be any place other than the ground contact surface of the tire, and the place provided in particular in sliding contact is not limited.

  Further, a plurality of wear powder removing mechanisms may be used as necessary, and the wear powder may be removed following a plurality of stages such as a first stage and a second stage. In that case, the first stage can be a coarser brush and the second stage can be a finer brush. In any case, however, care must be taken to prevent the tire body from being worn by the action of the brush itself.

  As shown in FIG. 3, when the rotating roller brush 2 'is used, the direction of rotation is the same as that of the tire, that is, the tire and the roller brush rotate in opposite directions on the contact surface that is in sliding contact. It is preferable to make contact with each other in that the effect of removing the abrasion powder can be increased.

  In the present invention, it is preferable to use a fixed brush or a rotating roller brush in which the brush portion is made of a metal wire. Further, the metal wire forming the brush is not particularly limited, but according to the knowledge of the present inventors, those having a metal wire diameter of 0.2 to 0.6 mm and a metal wire length of 20 to 30 mm are worn. It is preferable for enhancing the powder removing effect. The metal wire diameter is particularly preferably in the range of 0.4 to 0.6 mm.

  Further, when performing a running wear test of a tire according to the method of the present invention, the running wear test of the tire is performed while blowing wind at a temperature equal to or lower than the ambient atmosphere temperature on the tread surface of the running tire from at least one direction. Is preferred.

  If the running test is performed while cooling in this way, it is possible to prevent the tire wear powder from reattaching. In other words, one of the causes of wear particles reattaching and accumulating is heat generation, but the heat generation of the wear powder is suppressed by contacting the heat generation with a wear powder removal mechanism such as a cooled brush. And the reattachment force of the wear powder can be suppressed.

  Such cooling can also be performed by blowing cool air, but the parts such as the brush and spatula of the abrasion powder removing mechanism, the base part to which they are attached, the rotating shaft part, etc. are directly attached to the heat exchanger. It may be used or cooled by applying cooling air to those portions.

  Moreover, in this invention, it is preferable that an abrasion test apparatus has a mechanism which adjusts the pressing force at the time of making an abrasion powder removal mechanism slidably contact with the tread part of a tire.

  Specifically, the wear test apparatus according to the present invention is capable of adjusting the movement of the installation position in the tire normal direction, and has a contact force with respect to the tire tread surface (the pressing force of the wear powder removing mechanism and / or the tire tangent line). It is preferable that the direction force is adjustable, and a sensor capable of measuring the contact force is provided so that the contact force can be controlled and adjusted to an appropriate fixed range. Is good.

  In other words, if the pressing force and / or tire tangential force of the abrasion powder removing mechanism on the tire tread surface is too small, the dust removal effect will be small, and if it is too large, resistance to tire rotation will result, and control of the test conditions will be difficult. In addition, since there is a possibility that the original wear form may be changed, it is effective to control and adjust the contact force within a certain range. In addition, it is preferable to control and adjust the contact force within a certain range during traveling because the tire can be worn at a rate higher than intended in the wear test and the outer diameter can be reduced. According to the knowledge of the present inventors, for example, the braking / driving torque of the tire shaft is detected, and the torque (determined by the tangential force x tire radius) by pressing of the abrasion powder removing mechanism is 5 of the braking / driving torque value. It is good to make it within a range of ˜30%.

  In the test apparatus of the present invention, it is preferable that the wear powder removing mechanism is surrounded by a duct and has an air suction mechanism for sucking the wear powder removed through the duct. By adopting such a configuration, it is possible to quickly remove dust-removed tire wear powder from the periphery of the tire, and it is possible to more effectively prevent reattachment.

FIG. 1 is a schematic conceptual diagram schematically showing an example of a state in which a running wear test is performed by the running wear test method for tires of the present invention. FIG. 2 is a schematic conceptual diagram schematically showing another example of a state in which a running wear test is performed by the running wear test method for tires of the present invention. FIG. 3 is a schematic conceptual diagram schematically showing still another example of a state in which a running wear test is performed by the running wear test method for tires of the present invention.

Explanation of symbols

1: Tire 2: Wear powder removal mechanism (fixed brush)
2 ': Wear powder removing mechanism (roller brush)
3: Automobile body 4: Road surface 4 ': Endless belt

Claims (11)

  When performing a running abrasion test on a tire while running on a road surface or a virtual road surface while applying a load to the tire shaft, a wear powder removing mechanism is provided in sliding contact with the tread portion other than the ground contact surface of the tire. A tire running wear test method characterized by the above.   2. The tire running wear test method according to claim 1, wherein a fixed brush or a rotating roller brush is used as the wear powder removing mechanism provided in sliding contact with the tread portion.   3. The tire running wear test method according to claim 2, wherein the fixed brush or the rotating roller brush is made of a metal wire.   4. The tire running wear test method according to claim 3, wherein the metal wire forming the brush has a metal wire diameter of 0.2 to 0.6 mm and a metal wire length of 20 to 30 mm.   5. The tire according to claim 1, wherein a running wear test of the tire is performed while blowing wind having a temperature equal to or lower than the ambient atmosphere temperature from at least one direction on the tread surface of the running tire. Running wear test method.   It has a mechanism for applying a load to a tire shaft of a tire traveling on a road surface or a virtual road surface, and a wear powder removing mechanism provided so as to be slidable on a tread portion other than the ground contact surface of the traveling tire. Tire running wear test equipment.   7. The tire running wear test apparatus according to claim 6, wherein the wear powder removing mechanism slidably contacted with the tread portion is a fixed brush or a rotating roller brush.   8. The tire running wear test apparatus according to claim 6, further comprising a mechanism for adjusting a pressing force when the wear powder removing mechanism is brought into sliding contact with the tread portion of the tire.   The tire running wear test apparatus according to claim 6, 7 or 8, further comprising a mechanism for cooling the wear powder removing mechanism.   10. The tire running wear test apparatus according to claim 6, 7, 8 or 9, wherein the wear powder removing mechanism is a fixed brush or a rotating roller brush.   11. The tire running wear test apparatus according to claim 6, 7, 8, 9, or 10, wherein the wear powder removing mechanism is surrounded by a duct and has an air suction mechanism for sucking the wear powder through the duct.

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