KR20130054547A - Dynamic displacement measuring apparatus of tire tread - Google Patents

Dynamic displacement measuring apparatus of tire tread Download PDF

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Publication number
KR20130054547A
KR20130054547A KR1020110119982A KR20110119982A KR20130054547A KR 20130054547 A KR20130054547 A KR 20130054547A KR 1020110119982 A KR1020110119982 A KR 1020110119982A KR 20110119982 A KR20110119982 A KR 20110119982A KR 20130054547 A KR20130054547 A KR 20130054547A
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KR
South Korea
Prior art keywords
tread
tempered glass
ground plate
tire
glass ground
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KR1020110119982A
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Korean (ko)
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KR101332650B1 (en
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임청빈
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한국타이어월드와이드 주식회사
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Priority to KR1020110119982A priority Critical patent/KR101332650B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G01M17/02—Tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/24—Wear-indicating arrangements
    • B60C11/246—Tread wear monitoring systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/06—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle
    • B60C23/08—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle by touching the ground
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C25/00—Apparatus or tools adapted for mounting, removing or inspecting tyres
    • B60C25/002—Inspecting tyres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • B29L2030/002—Treads

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

PURPOSE: A device for measuring the dynamic deformation of tire tread is provided to continuously photograph the deformation generated in each rubber block of the tread with a high-speed camera, thereby obtaining the deformation of the tread precisely by image-processing. CONSTITUTION: A device for measuring the dynamic deformation of tire tread comprises a test road(1), basement(2), a tempered glass ground plate(3), and a high-speed camera(4). When a tire(101) of a vehicle(100) is driving on the tempered glass ground plate covering the opened top surface of the basement, the deformation of the tread is measured by continuously photographing the deformation of the tread with the high-speed camera. The tempered glass ground plate is possess-supported by a load support frame(5) installed in the basement, thereby being maintained at the height identical to the test road. Circular grooves(6) of identical size are continuously formed on the upper surface of the tempered glass ground plate. A plurality of color beads is contained inside the circular grooves. The upper surface of the tempered glass ground plate is covered with a black rubber sheet(8) of a high elongation ratio.

Description

타이어 트레드의 동적 변형량 측정장치{Dynamic displacement measuring apparatus of tire tread}Dynamic displacement measuring apparatus of tire tread

본 발명은 타이어 트레드의 변형량을 측정하는 장치에 관한 것으로, 특히 타이어의 수막현상, 제동성능, 마모성능, 핸들링(Handling) 성능 및, 원더링(Wondering) 성능 등 다양한 타이어의 성능향상을 위한 타이어 트레드의 패턴이나 구조설계에 필요로 하는 트레드의 동적 변형량을 제공하는 타이어 트레드의 동적 변형량 측정장치에 관한 것이다.The present invention relates to an apparatus for measuring the deformation amount of a tire tread, and more particularly, to a tire tread for improving performance of various tires such as water film development, braking performance, wear performance, handling performance, and wondering performance. The present invention relates to a device for measuring the dynamic strain of a tire tread providing a dynamic strain of a tread required for a pattern or a structural design.

주지된 바와 같이 타이어의 트레드는 노면과 접촉하여 맞닿아 회전하는 고무층으로, 이 트레드의 변형의 타이어의 여러 성능에 큰 영향을 끼치는 인자이다.As is well known, the tread of a tire is a rubber layer that contacts and rotates in contact with the road surface, and is a factor that greatly affects various performances of the tire of the deformation of the tread.

즉, 타이어의 수막현상, 제동성능, 마모성능, 핸들링 성능 등 다양한 성능이 타이어의 트레드 변형량과 밀접한 관계를 가지기 때문에 타이어 설계에서 트레드 변형에 대한 관찰이 요구된다.In other words, since various performances such as water film phenomenon, braking performance, wear performance, and handling performance of the tire have a close relationship with the tread deformation amount of the tire, it is required to observe the tread deformation in the tire design.

통상적으로 수직하중을 받는 타이어의 트레드 블록(Block)은 수직방향의 압축 변형과 함께 폭방향으로 볼록해지는 변형(이를 Bulge 현상이라 함)이 발생하고, 또한, 수직하중과 전단하중을 받는 트레드 블록은 전단변형에 의해 리딩 엣지(Leading edge)가 말려드는 변형(Roll-over 현상)이 발생한다.In general, a tread block of a tire subjected to vertical loads has a deformation that becomes convex in the width direction (which is called a bulge phenomenon) together with a compressive deformation in the vertical direction, and a tread block subjected to vertical loads and shear loads also The shear deformation causes the leading edge to roll (roll-over phenomenon).

타이어의 트레드는 수많은 고무블록의 집합체이고, 이들 블록의 형상이나 구조가 각기 다르기 때문에 실제 타이어에서 이들 트레드 블록이 어떤 변형으로 얼마만큼 발생하는지를 관찰하기가 쉽지 않았다.Tire treads are a collection of numerous rubber blocks, and because they differ in shape and structure, it is not easy to observe how many of these tread blocks occur in actual tires.

한편, 종래의 타이어 트레드의 변형량 측정은 대부분 시험실 내에서 시험하는 것으로, 실제 차량에 취부된 타이어가 주행하면서 제동이나 선회 운동할 때의 타이어 트레드의 변형량을 측정하기가 어려운 문제점이 있었다. On the other hand, the conventional measurement of the deformation amount of the tire tread is a test in the test chamber, there is a problem that it is difficult to measure the deformation amount of the tire tread when braking or turning movement while the tire mounted on the actual vehicle is running.

즉 종래에는 실내 시험실에서 드럼이나 평판에 침이나 핀형태의 변위센서를 부착하여 타이어의 트레드 변형량을 측정하였는데, 이런 경우 변위센서의 측정범위가 ±1㎜ 정도로 작아서 타이어의 급격한 선회운동이나 제동운동이 발생할 때, 이 변위센서들의 측정범위를 벗어나므로 정확한 트레드 변형량을 측정하는 것이 불가능하였다.That is, in the conventional laboratory, the tread deformation of the tire was measured by attaching a needle or pin-type displacement sensor to a drum or a flat plate. In this case, the displacement range of the displacement sensor was small as ± 1 mm. When it occurred, it was beyond the measurement range of these displacement sensors, so it was impossible to measure the exact tread deformation amount.

또한, 접지영역의 한 점만 측정하게 되고 여러 위치를 동시에 측정하기 위해 많은 변위 센서들을 설치함에 따른 소요 비용이 클 뿐만 아니라, 측정하고자 하는 트레드의 위치에 따라 변위센서들의 위치를 변경하면서 반복 측정을 해야 하므로 측정시간이 많이 걸리는 문제점도 있었다.In addition, only one point of the ground area is measured and the cost of installing many displacement sensors to measure several positions simultaneously is not only high, but also iteratively measuring the displacement of the displacement sensors according to the position of the tread to be measured. So there was a problem that takes a lot of measurement time.

이에 본 발명은 상기와 같은 종래 문제점을 감안하여 발명된 것으로, 타이어 트레드의 동적 변형량 측정시 실차 주행에서 선회 또는 제동과 같이 차량 거동의 변화에 따른 타이어가 접지되어 회전하는 동안 발생하는 트레드의 변형을 고속 촬영한 이미지를 이용한 화상처리를 통해 트레드의 변화량을 측정할 수 있는 타이어 트레드의 동적 변형량 측정장치를 제공함에 그 목적이 있다.Accordingly, the present invention has been made in view of the above-described conventional problems, and the tread deformation occurring while the tire is grounded and rotated due to a change in vehicle behavior such as turning or braking in a real vehicle running when measuring the dynamic deformation of the tire tread is measured. An object of the present invention is to provide an apparatus for measuring a dynamic deformation amount of a tire tread capable of measuring a change amount of a tread through image processing using a high speed photographed image.

상기와 같은 목적을 달성하기 위한 본 발명은 시험노면의 지하실 개방 상부면을 덮고 있는 강화유리 접지판 위로 차량의 타이어가 주행할 때 이 타이어의 트레드 변형량을 고속 카메라로 연속 촬영하여 트레드의 변형량을 측정하는 타이어 트레드의 동적 변형량 측정장치에 있어서, 상기 강화유리 접지판은 지하실에 설치된 하중 지지 프레임으로 보유 지지되어 시험노면과 동일면 높이로 유지되고, 이 강화유리 접지판의 상부 표면에는 동일한 크기의 원형 홈이 연속 형성되며, 이 각각의 원형홈 내에는 여러 개의 색구슬이 담겨져 있고, 상기 강화유리 접지판의 상부 표면을 연신율이 높은 검은색 고무시트가 덮어 씌워지되, 이 검은색 고무시트의 양쪽 테두리를 강화유리 접지판에 고정용 록킹부로 고정되어 있다.In order to achieve the above object, the present invention continuously measures the tread deformation amount of the tire with a high-speed camera when the tire of the vehicle runs over the tempered glass ground plate covering the basement open upper surface of the test surface, and measures the deformation amount of the tread. In the apparatus for measuring the dynamic strain of a tire tread, the tempered glass ground plate is held by a load supporting frame installed in the basement and maintained at the same level as the test surface, and a circular groove having the same size on the upper surface of the tempered glass ground plate. Each of the circular grooves includes a plurality of colored beads, and a black rubber sheet having high elongation is covered on the upper surface of the tempered glass ground plate, and both edges of the black rubber sheet are covered. It is fixed to the tempered glass ground plate by the locking locking part.

이러한 본 발명에 따른 타이어 트레드의 변형량 측정장치는 타이어가 취부된 차량이 주행할 때 이 타이어의 선회운동, 제동, 또는 가속 운동시 트레드의 각 고무블록에서 발생하는 변형량을 고속 카메라에 의해 연속 촬영하여 이들 이미지에 대한 화상처리를 통해 트레드 변형량을 섬세하게 얻을 수 있도록 되어 있다.The apparatus for measuring a deformation amount of a tire tread according to the present invention continuously photographs the deformation amount generated in each rubber block of the tread during turning, braking, or acceleration of the tire when the vehicle on which the tire is mounted travels by using a high speed camera. The image processing on these images makes it possible to obtain a delicate amount of tread deformation.

도 1은 본 발명에 따른 타이어 트레드의 동적 변형량 측정장치를 보여주는 전체 구성도,
도 2는 본 발명의 요부인 강화유리 접지판의 부분 평면도,
도 3 (A)는 타이어가 접지하게 직선 기준좌표 영상이고, (B)는 타이어가 접지하는 동안 변형좌표 영상,
도 4 (C)와 (D)는 트레드 변형량의 변화궤도를 X축 방향과 Y축 방향으로 보여준 그래프이다.1 is an overall configuration showing a dynamic strain measuring device of a tire tread according to the present invention,
2 is a partial plan view of a tempered glass grounding plate which is a main part of the present invention;
3 (A) is a linear reference image for the tire to ground, (B) is a deformation coordinate image, while the tire is grounded,
4 (C) and (D) are graphs showing the change trajectory of the tread deformation amount in the X-axis direction and the Y-axis direction.

이하, 본 발명을 첨부된 예시도면에 의거 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1에는 본 발명에 따른 타이어 트레드의 변형량 측정장치 전체를 보여주는 구성 단면도이다.1 is a cross-sectional view showing the entire deformation amount measuring apparatus of a tire tread according to the present invention.

본 발명은 시험노면(1)의 지하실(2) 개방 상부면을 덮고 있는 강화유리 접지판(3) 위로 차량(100)의 타이어(101)가 주행할 때 이 타이어(101)의 트레드 변형량을 고속 카메라(4)로 연속 촬영하여 트레드의 변형량을 측정하도록 이루어진 타이어 트레드의 변형량 측정장치에 있어서, 상기 강화유리 접지판(3)은 지하실(2)에 설치된 하중 지지 프레임(5)으로 보유 지지되어 시험노면(1)과 동일면 높이로 유지되고, 이 강화유리 접지판(3)의 상부 표면에는 동일한 크기의 원형홈(6)이 연속 형성되면서 이 원형홈(6) 내에 유동하는 여러 개의 색구슬(7)이 담겨져 있고, 상기 강화유리 접지판(3)의 상부 표면을 연신율이 높은 검은색 고무시트(8)가 덮어 씌워지되, 이 검은색 고무시트(8)의 양쪽 테두리가 강화유리 접지판(3)에 고정용 록킹부(9)에 의해 고정되는 구조로 되어 있다.The present invention provides a high speed tread deformation amount of the tire 101 when the tire 101 of the vehicle 100 runs over the tempered glass ground plate 3 covering the basement 2 open top surface of the test road 1. In the tire tread strain measuring device configured to measure the strain of the tread by continuously photographing with a camera (4), the tempered glass ground plate (3) is held and tested by a load supporting frame (5) installed in the basement (2) Several colored beads 7 which are maintained at the same height as the road surface 1 and flow in the circular groove 6 while the circular grooves 6 of the same size are continuously formed on the upper surface of the tempered glass ground plate 3. ), The upper surface of the tempered glass ground plate (3) is covered with a high elongation of the black rubber sheet (8), and both edges of the black rubber sheet (8) is reinforced glass ground plate (3) ) Is fixed by the locking section (9). .

여기서 측정면적이 800 × 600㎜인 상기 강화유리 접지판(3)의 상부 표면에 형성된 각각의 원형홈(6)은 직경 20㎜ ~ 50㎜, 깊이 1㎜로 가공되어 있으며, 상기 강화유리 접지판(3)을 덮고 있는 검은색 고무시트(8)는 밑면에 흰색의 격자선(10)이 그어져 있다.Here, each circular groove 6 formed in the upper surface of the tempered glass ground plate 3 having a measuring area of 800 × 600 mm is processed to a diameter of 20 mm to 50 mm and a depth of 1 mm. The black rubber sheet 8 covering (3) has a white grid line 10 drawn on its bottom.

그리고 상기 지하실(2)에 설치되어 강화유리 접지판(3)을 보유 지지하는 하중 지지 프레임(5)들은 4개의 동일 구조물이 되면서 10톤 이상의 하중을 지지할 수 있도록 설계되고, 상기 강화유리 접지판(3)에 접촉하여 이동하는 타이어(101)의 변형량을 고속 카메라(4)로 연속 촬영시 촬영의 선명도를 위해 조명등(11)이 지하실(2) 내에 여러 개 설치되어 있다.The load supporting frames 5 installed in the basement 2 and holding the tempered glass ground plates 3 are designed to support loads of 10 tons or more while being four identical structures, and the tempered glass ground plates. A plurality of lighting lamps 11 are provided in the basement 2 for the clarity of shooting in the continuous shooting of the deformation amount of the tire 101 moving in contact with (3) with the high speed camera 4.

그리고 차량(100)이 타이어(101)가 강화유리 접지판(3)을 진입 전과 통과 후에 고속 카메라(4)에서 측정시작과 끝을 알리는 트리거 역할과 속도 산출을 위한 거리와 시간을 제공하기 위해 강화유리 접지판(3)의 전후로 시험노면(1)에는 포토센서(12)가 설치되어 있다.And the vehicle 100 is reinforced to provide the distance and time for calculating the speed and the role of triggering the start and end of the measurement in the high-speed camera 4 before and after the tire 101 enters the tempered glass ground plate (3) A photo sensor 12 is provided on the test road surface 1 before and after the glass ground plate 3.

한편, 상기 타이어(101)가 강화유리 접지판(3)을 통과하는 동안 지하실(2) 아래에 설치된 고속 카메라(4)는 1초에 1000장 이상의 사진 촬영을 할 수 있으면서 해상도가 1600 × 1200일 경우 측정면적을 400 × 300으로 설정하면 0.25㎜ 간격의 섬세한 트레드 변형량과 접지형상을 얻을 수 있도록 되어 있다.On the other hand, the high speed camera 4 installed under the basement 2 while the tire 101 passes through the tempered glass ground plate 3 has a resolution of 1600 x 1200 days while being able to take 1000 or more photos per second. In this case, if the measurement area is set to 400 × 300, the delicate tread deformation and the ground shape of the 0.25 mm interval can be obtained.

이러한 본 발명에 따른 타이어 트레드의 변형량 측정장치는 도 3 (A)와 같이 타이어(101)의 트레드가 강화유리 접지판(3)의 접지되기 직전의 촬영 영상에서 얻어진 검은색 고무시트(8)의 밑면에 그어진 흰색의 격자선(10)과 이 강화유리 접지판(3)의 원형홈(6)에 담겨 있는 색구슬(7)의 위치를 기준좌표로 설정하고, 도 3 (B)와 같이 타이어(101)가 선회운동이나 제동운동을 하면서 변화되는 흰색의 격자선(10)과 색구슬(7)의 위치변화와 접지형상을 고속 카메라(4)로 연속 촬영하여 이미지를 50 ~ 2000장을 얻게 되고, 이미지에 대한 화상처리를 통해 트레드의 변형량을 측정할 수 있다.The strain measurement device of the tire tread according to the present invention is a black rubber sheet (8) obtained from the image taken immediately before the tread of the tire 101 is grounded as shown in Figure 3 (A) The position of the color grid 7 contained in the white grid line 10 drawn on the bottom surface and the circular groove 6 of the tempered glass ground plate 3 is set as the reference coordinate, and the tire as shown in Fig. 3B. (101) continuously captures the position change and ground shape of the white grid line (10) and the color bead (7) which are changed during the turning motion or the braking motion with a high speed camera (4) to obtain 50 to 2000 images. The amount of deformation of the tread can be measured through image processing on the image.

또한, 도 4 (C)와 (D)와 같이 고속 촬영에서 얻어진 촬영영상에서 특정위치의 흰색의 격자선(10)과 색구슬(7)의 좌표값 변화를 산출하면 임의의 트레드 블록에 대한 트레드 변형량의 변화궤도를 X축 방향과 Y축 방향의 그래프로 얻을 수 있다.In addition, when the coordinate value change of the white grid line 10 and the color beads 7 at a specific position is calculated in the captured image obtained at the high speed shooting as shown in FIGS. 4C and 4D, the tread for an arbitrary tread block is calculated. The change trajectory of the deformation amount can be obtained as a graph in the X-axis direction and the Y-axis direction.

1 : 시험노면, 2 : 지하실,
3 : 강화유리 접지판, 4 : 고속 카메라,
5 : 하중 지지 프레임, 6 : 원형홈,
7 : 색구슬, 8 : 검은색 고무시트,
9 : 록킹부, 10 : 흰색의 격자선,
11 : 조명등, 12 : 트리거 및 포토센서.1: test surface, 2: basement,
3: tempered glass ground plate, 4: high speed camera,
5: load supporting frame, 6: circular groove,
7: colored beads, 8: black rubber sheet,
9: locking part, 10: white grid line,
11: lamp, 12: trigger and photosensor.

Claims (3)

시험노면(1)의 지하실(2) 개방 상부면을 덮고 있는 강화유리 접지판(3) 위로 차량(100)의 타이어(101)가 주행할 때 이 타이어(101)의 트레드 변형량을 고속 카메라(4)로 연속 촬영하여 트레드의 변형량을 측정하도록 이루어진 타이어 트레드의 변형량 측정장치에 있어서,
상기 강화유리 접지판(3)은 지하실(2)에 설치된 하중 지지 프레임(5)으로 보유 지지되어 시험노면(1)과 동일면 높이로 유지되고, 이 강화유리 접지판(3)의 상부 표면에는 동일한 크기의 원형홈(6)이 연속 형성되면서 이 원형홈(6) 내에 유동하는 여러 개의 색구슬(7)이 담겨져 있고, 상기 강화유리 접지판(3)의 상부 표면을 연신율이 높은 검은색 고무시트(8)가 덮어 씌워지되, 이 검은색 고무시트(8)의 양쪽 테두리가 강화유리 접지판(3)에 고정용 록킹부(9)에 의해 고정되는 구조로 이루어진 것을 특징으로 하는 타이어 트레드의 동적 변형량 측정장치.When the tire 101 of the vehicle 100 runs over the tempered glass ground plate 3 covering the basement 2 opening top surface of the test road 1, the tread deformation amount of the tire 101 is measured by the high-speed camera 4. In the tire tread strain measuring device configured to measure the deformation amount of the tread by continuously photographing),
The tempered glass ground plate 3 is held by the load supporting frame 5 installed in the basement 2 and is maintained at the same level as the test road surface 1, and the same as the upper surface of the tempered glass ground plate 3. A black rubber sheet having a high elongation at the upper surface of the tempered glass ground plate 3 is contained in the circular grooves 6 having the size of the circular grooves 6 continuously formed therein. (8) is covered, the dynamic edge of the tire tread, characterized in that the structure of the two edges of the black rubber sheet (8) is fixed to the tempered glass ground plate (3) by the locking locking portion (9) Strain measuring device. 제 1항에 있어서,
상기 강화유리 접지판(3)의 상부 표면에 형성된 각각의 원형홈(6)은 직경 20㎜ ~ 50㎜, 깊이 1㎜로 가공된 것을 특징으로 하는 타이어 트레드의 동적 변형량 측정장치.The method of claim 1,
Each circular groove (6) formed on the upper surface of the tempered glass ground plate (3) is a dynamic strain measuring device of the tire tread, characterized in that the processing is 20mm ~ 50mm, 1mm in depth. 제 1항에 있어서,
상기 강화유리 접지판(3)을 덮고 있는 검은색 고무시트(8)는 밑면에 흰색의 격자선(10)이 그어져 있는 것을 특징으로 하는 타이어 트레드의 동적 변형량 측정장치.
The method of claim 1,
The black rubber sheet (8) covering the tempered glass ground plate (3) is a dynamic strain measuring device of the tire tread, characterized in that the grid line 10 of the white is drawn on the bottom.
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