KR20110082345A

KR20110082345A - Impact test machine and method of tire tread

Info

Publication number: KR20110082345A
Application number: KR1020100002284A
Authority: KR
Inventors: 우종선
Original assignee: 한국타이어 주식회사
Priority date: 2010-01-11
Filing date: 2010-01-11
Publication date: 2011-07-19

Abstract

PURPOSE: Device and method for testing impulse to a tire tread are provided to test durability of a tire tread due to impulsive force applied to the tire tread from road when a tire passes on stone and a puddle on the road. CONSTITUTION: A method for testing impulse to a tire tread is as follows. A tire installation unit applies the same load to a real vehicle to a tire(2). A test surface is driven through rotation of a driving shaft. A test result is produced and at the same time, it is checked with naked eyes whether there is crack. A tire tread determines that shock resistance is excellent if there are no cracks on a tire sidewall while a test process is repeated 10 times.

Description

Impact test machine and method of tire treads

The present invention, the present invention, by simplifying many of the mechanical parts required for the load cell and other impact amount of the prior art through the test device consisting of a grooved test surface and a tire mounting device to which the vehicle suspension system is applied, A test apparatus and method for performing an impact test.

In general, the suspension system of the vehicle supports the weight of the vehicle and at the same time alleviates and absorbs the up and down vibrations of the wheels caused by irregular roads, thereby preventing the vibration from being transmitted directly to the body, improving the passenger comfort, protecting the luggage, and It is a device that reduces the dynamic stress of each part and improves driving safety by suppressing wheel vibration.

Typically, tires are mounted on a vehicle to drive, and accidents are caused by various factors during driving. That is, as the tire travels on the road, the tire passes through uneven parts such as lumps and puddles on the road, and is subjected to an impact load due to collision with an obstacle on the ground.

1 is a side view of a tire tread portion dynamic impact load addition and impact amount measuring apparatus according to the prior art, a side view showing an operating state.

The tire tread part dynamic impact load addition and impact amount measuring device according to the prior art, when the tire travels on the road and passes through the foreign matter and puddles such as stones existing on the road, the impact load acting from the uneven road surface An apparatus for evaluating the durability of the tread part by the impact force applied to the tire tread at this time, as shown in FIG. 1, a load adding part 3 for applying a load to the tire 2 mounted on the rotating shaft 1. And a driving part 5 for reciprocating linear movement of the load adding part 3 on the bed 4, and a measuring part measuring the impact load due to the load and rotation movement while being rotated while the tire collides with the load. The part 8 is provided on the bed 4 and has a load cell having a projection 8 which collides with the tread 6 of the tire 2 and a helix coupling portion 9 in which the projection 8 is helically coupled. 10 and The load cell 10 is connected to the data processor 12 via an amplifier 11.

Here, the load adding portion 3 of the tire 2 is installed on the bed 4 that forms the running road surface of the tire 2 via the vertical frame 14, and the vertical frame 13 has an electric motor ( 14) and a screw jack 15 is installed, the rotary shaft (1) of the load adding portion (3) is connected to the screw jack 15, the tire (2) by the operation of the screw jack 15 is raised. , Position is adjusted downward.

On the other hand, the drive unit 5 is connected to the ball screw 16 provided on the longitudinal side of the bed 4 in the vertical frame 13 of the load adding unit 3, so that the drive by the electric motor 17 When the ball screw 16 is rotated, the load adding portion 3 is linearly reciprocated on the bed 4.

The data processing unit 12 of the measuring unit 7 includes a data collecting unit for collecting a signal applied by the load cell 10, a data storage unit, a data analyzing unit, an output unit, and the like, as is known. .

In this way, whether the uneven portion is large or small, the tire is subjected to a constant dynamic impact load while driving the vehicle, and at the same time, a very large tensile force is generated at the belt and the carcass cord of the impact portion, thereby breaking the belt cord or the carcass cord of the tire tread portion. Loss of damage may occur, and such damage may cause a shock rupture of the tire, and may cause an accident such as a vehicle overturning.

In addition, the dynamic impact force that continuously acts on the tread portion of the tire on an unpaved road or the like not only damages the tread portion of the tire, but also changes the spring stiffness of the tire and exerts a force on the tire bead portion, thereby making a difference between the tire bead portion and the wheel flange. Friction is induced to generate bead portion heat generation, and shear force is generated between the carcass of the tire bead portion and the rubber of the lower end portion of the sidewall, thereby causing the bead portion to be damaged.

Therefore, each tire manufacturer has developed and carried out various types of indoor test apparatuses and methods for reproducing such an accident pattern. Mainly, the surface of the traveling drum, which abuts against the tread portion of the tire, generally has a constant curvature and is smoothly treated. However, as many test methods have been developed to reproduce various accidents occurring in the tread part while driving a vehicle, the driving equipment has been modified to meet the purpose. However, in the prior art, it is not possible to reproduce a tread burst accident pattern caused by protrusions (stones, irregularities and recessed ground) which suddenly appear while driving a vehicle.

FIG. 2 is a view schematically illustrating a method for evaluating an impact amount of a tire when passing through a puddle of a road performed by an automobile company.

As mentioned above, the prior art is a system which measures the impact amount of a tread part through a load cell. Therefore, there is a disadvantage that a lot of mechanical parts are required to measure the load cell and other impact amount. In addition, it differs from the actual vehicle test method for the phenomenon occurring when passing through the puddles on the road currently being carried out by the automobile company, and has a low correlation with the actual vehicle test.

Accordingly, the present invention has been invented to solve the above problems of the prior art, the impact force acting on the tire tread from the road surface when the tire travels on the road and passes foreign matters and puddles such as stones present on the road. It is an object of the present invention to provide a test apparatus and a method for testing the durability of the tread portion.

In order to achieve the above object, the impact test apparatus of the tire tread portion of the present invention comprises a test surface with a groove and a tire attaching device to which a vehicle suspension system is applied, and performs an impact resistance test of the tread portion of a tire.

In addition, it is preferable that the height of the grooved test road surface is controlled to have a height of about 1 cm from the surface, so as to enable an indoor test suitable for road conditions of actual vehicles such as a bad road, a road path, and a flat road.

The road may include off roads, mining areas, mountainous terrain, etc. The roads may include pavement roads and highways.

Further, the height range of the grooved test road surface is up to 15 cm on the drum surface, and can be adjusted in units of 1 cm.

Further, the width of the grooved test surface can be controlled by the control equipment, it is preferred that the maximum (Max) 20cm, the minimum (Min) 10cm.

In addition, the method for testing the durability of the tread portion of the tire according to the invention, the step of applying a load equal to the actual vehicle state to the tire through the tire mounting device, and driving the grooved test road through the rotation of the drive shaft In addition, the test result is calculated every 10 times through the grooved test surface, and visually checking whether the tire sidewall part is cracked, and cracking the tire sidewall part even if the test process is repeated 10 times. If this does not occur, the step of determining that the impact resistance of the tread portion of the tire to be tested is excellent.

The present invention is a test method for evaluating the durability of a tire due to a road hazard generated on an actual road (in case of a groove or a boulder on a road) in an indoor test, and a method for evaluating on a road with a real vehicle. It is the most similarly reproduced test. In addition, the risk of vehicle damage that may occur during actual vehicle testing. It can be called an indoor test method that eliminates the danger that may occur to drivers when driving a test vehicle.

1 is a side view of a tire tread portion dynamic impact load addition and impact amount measuring apparatus according to the prior art, a side view showing an operating state.
FIG. 2 is a view schematically illustrating a method for evaluating an impact amount of a tire when passing through a puddle of a road performed by an automobile company.
3 shows a schematic configuration diagram of a rod hazard test apparatus according to the present invention.
4 is a view schematically showing the surface of the belt rubbing with the tire.
5 is a view for explaining the actual road surface forming a stone, unevenness, bumps, recessed terrain under various conditions.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described, referring drawings.

The present invention relates to a tire tread portion due to a road hazard (Road Hazard), in particular any object that causes a tire failure, such as stones, curbs, and fine grooves on the road. This is a test method that evaluates the impact resistance in a car that reproduces the method evaluated by the car manufacturer indoors.

3 shows a schematic configuration diagram of a rod hazard test apparatus according to the present invention.

In Fig. 3, reference numeral A denotes a tire, B denotes a belt having a groove shape of a test road, and C denotes a tire mounting device to which a suspension of a vehicle is applied. In this case, the height of the grooved test road surface is controlled to have a height of about 1 cm from the surface, so that the indoor test can be performed in accordance with the road conditions of the actual vehicle, such as the road, the road, and the flat road. The roads may include off roads, mining areas, mountainous terrains, and the roads may include pavements and highways. The height range of the grooved test surface is up to 15 cm on the drum surface and can be adjusted in units of 1 cm. The width of the grooved test surface can be controlled by the control equipment, which is maximum 20cm and minimum 10cm. By such width control, wide real depressions (pits, construction sections) and narrow depressions (railways, unevenness, bumps, etc.) can be realized under actual road conditions. Here, the depressions are arranged in several places at equal intervals and irregularly on the drum circumference.

4 is a view schematically showing the surface of the belt rubbing with the tire.

In this case, the belt is driven by the drive shaft. The material of the surface of the belt, that is, the surface to be rubbed with the tire, is made of steel, and 80 grit of a safety walk is applied to increase friction with the tire.

As an effect that can be expected in the impact test apparatus and method of the tire tread portion according to the present invention as described above, it is possible to reproduce the impact burst (impact burst) accident.

5 is a view for explaining the actual road surface forming a stone, unevenness, bumps, recessed terrain under various conditions.

As shown in FIG. 5, the actual road surface is formed of stones, unevenness, bumps and recessed terrain under various conditions, and it is possible to reproduce an accident such as an impact burst of a tread portion of a tire generated while driving in such a place ( In the past, there was no test method to reproduce such an accident).

The method of testing the durability of the tread part of a tire by the test apparatus of this invention comprised as mentioned above is as follows.

Firstly, a tire attaching device is applied to a tire with the same load as the actual vehicle state.

Secondly, the grooved test surface is driven through the rotation of the drive shaft.

Third, the test results are calculated every ten times through the grooved test surface, and the cracks on the tire sidewall are visually checked.

Fourth, if the crack does not occur in the tire sidewall portion even if the test process is repeated ten times, it is determined that the impact resistance of the tread portion of the tire to be tested is excellent.

Of course, the test process and test method as described above can be completed by comparing the data with the actual vehicle test.

Claims

A tire tread portion impact test apparatus comprising a test surface with a groove and a tire attaching device to which a vehicle suspension system is applied, to perform an impact resistance test of a tread portion of a tire.

The test surface of claim 1, wherein the height of the grooved test road surface is controlled to have a height of about 1 cm from the surface, so that an indoor test can be performed in accordance with road conditions of a vehicle actually used, such as a bad road, a road path, and a flat road. Tire tread part impact tester

The impact test of the tire tread portion according to claim 2, wherein the bad road includes an off road, a mining area, a mountainous terrain, and the like. Device.

The impact test apparatus according to claim 2, wherein the height of the grooved test road surface is up to 15 cm on the drum surface and is adjustable in units of 1 cm.

The method of claim 1, wherein the width of the grooved test surface can be controlled by a control device, the impact test apparatus of the tire tread portion, characterized in that the maximum (Max) 20cm, the minimum (Min) 10cm.

As a method of testing the durability of the tread part of a tire by the test apparatus as described in any one of Claims 1-5,
Applying the same load to the tire as the actual vehicle state through the tire mounting device;
Driving the grooved test road through the rotation of the drive shaft;
Every time the groove passes the test surface 10 times, the test result is calculated and visually checks whether the tire sidewall is cracked,
If the crack does not occur in the tire sidewall portion even if the test process is repeated 10 times, the impact test method of the tire tread portion, characterized in that it comprises a step of determining that the impact resistance of the tread portion of the tire to be tested is excellent.