WO2021206023A1 - タイヤの摩耗測定装置および摩耗測定方法 - Google Patents

タイヤの摩耗測定装置および摩耗測定方法 Download PDF

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Publication number
WO2021206023A1
WO2021206023A1 PCT/JP2021/014348 JP2021014348W WO2021206023A1 WO 2021206023 A1 WO2021206023 A1 WO 2021206023A1 JP 2021014348 W JP2021014348 W JP 2021014348W WO 2021206023 A1 WO2021206023 A1 WO 2021206023A1
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WIPO (PCT)
Prior art keywords
magnetic field
detection unit
tire
wear
field detection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/014348
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English (en)
French (fr)
Japanese (ja)
Inventor
山本　秋人
須藤　能啓
徳男 中村
一成 瀬下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
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Alps Alpine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alps Alpine Co Ltd filed Critical Alps Alpine Co Ltd
Priority to DE112021002262.8T priority Critical patent/DE112021002262T5/de
Priority to CN202180025715.0A priority patent/CN115397678B/zh
Priority to JP2022514047A priority patent/JP7332791B2/ja
Publication of WO2021206023A1 publication Critical patent/WO2021206023A1/ja
Priority to US17/954,143 priority patent/US12098972B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • B60C11/243—Tread wear sensors, e.g. electronic sensors
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws

Definitions

  • the present invention relates to a wear measuring device and a wear measuring method for detecting tire wear based on a magnetic field of a magnet embedded in a tread.
  • Patent Document 1 describes a method of embedding a magnet in a tread, detecting the magnetic field of the embedded magnet using a magnetic sensor arranged in the tire, and evaluating the state of a groove and deterioration of the tire. ..
  • an object of the present invention is to provide a tire wear measuring device and a wear measuring method capable of accurately detecting tire wear by suppressing the influence of an external magnetic field such as geomagnetism.
  • the present invention focuses on the fact that when the magnetic field of the magnet embedded in the tread is detected, an external magnetic field such as the geomagnetism causes a decrease in the accuracy of wear measurement, and has the following configuration. ..
  • a first magnetic field detecting unit provided at a position where the magnetic field from the magnet can be detected.
  • the first magnetic field detecting unit includes a second magnetic field detecting unit provided at a position different from the influence of the magnetic field of the magnet.
  • the second magnetic field detection unit may be provided at a position where the magnetic field of the magnet does not affect. With this configuration, only the external magnetic field other than the magnetic field from the magnet is detected by the second detection unit. Therefore, the influence of the external magnetic field can be easily removed by using the difference between the detected values of the first magnetic field detection unit and the second magnetic field detection unit.
  • the first magnetic field detection unit and the second magnetic field detection unit may be provided in parallel on the inner surface of the tire in a direction orthogonal to the rotation direction of the tire. With this configuration, the influence of the geomagnetism on the first magnetic field detection unit and the second magnetic field detection unit is the same. Therefore, the influence of the external magnetic field in the wear measurement can be removed by using the detection values simultaneously detected by the first magnetic field detection unit and the second magnetic field detection unit.
  • the first magnetic field detection unit and the second magnetic field detection unit can detect magnetic fields in three axial directions orthogonal to each other.
  • the first magnetic field detection unit and the second magnetic field detection unit are arranged on the same plane, and the three sensitivity axes of the first magnetic field detection unit and the second magnetic field detection unit are in the same direction. It is preferable that they are arranged so as to face each other. With this configuration, even if there is some deviation in the mounting position and inclination of the magnet of the tread part and the first magnetic field detection part and the second magnetic field detection part in the tire, the change of the combined magnetic field of the three axes can be compared. , It becomes possible to measure the tire wear state with high accuracy.
  • the wear measuring device is a control unit that estimates the degree of wear of the tire based on the first detection value detected by the first magnetic field detection unit and the second detection value detected by the second magnetic field detection unit. May be provided.
  • the wear detection device includes a storage unit that stores a table showing the relationship between the magnetic field of the magnet embedded in the tread portion of the tire and the amount of wear of the tread portion, and the control unit is the first. 1
  • the degree of wear of the tire is measured based on the first detection value detected by the magnetic field detection unit, the second detection value detected by the second magnetic field detection unit, and the table. It may be.
  • the control unit it is possible to output as a measurement result of the degree of wear of the tire.
  • a wear measuring method for measuring the degree of wear of the tire by detecting a magnetic field generated by a magnet embedded in the tread portion of the tire, a first magnetic field detecting unit provided at a position where the magnetic field generated by the magnet can be detected first.
  • the magnetic field of the above is detected, and the influence of the magnetic field by the magnet is detected by the second magnetic field detection unit provided at a position different from that of the first magnetic field detection unit.
  • a wear measuring method characterized in that the degree of wear of the tire is measured based on a second magnetic field.
  • tire wear measuring device of the present invention can remove the influence of an external magnetic field such as geomagnetism from the detected magnetic field by detecting two magnetic fields by the first magnetic field detection unit and the second magnetic field detection unit. , Tire wear can be measured accurately.
  • FIG. 3 is a cross-sectional view illustrating a state in which a conventional tire wear measuring device is provided on a tire.
  • the tire wear measuring device 100 has a broken line in the figure as the magnetic field detection unit 112 wears the magnetic material 111 embedded in the tread portion 22 on the outer surface 21 of the tire 20.
  • the indicated magnetic field M changes. By detecting the change in the magnetic field M, the wear state of the tread portion 22 is measured.
  • an external magnetic field G such as geomagnetism exists in addition to the magnetic field M.
  • the external magnetic field G becomes noise when measuring the magnetic field M, and causes a decrease in the measurement accuracy of the magnetic field M by the magnetic field detection unit 112.
  • the magnetic field detection unit 112 provided on the inner side surface 23 of the tire 20 measures the magnetic field M, the magnetic field M is changed by the steel wire layer 24 inside the tire 20. Therefore, the influence of the external magnetic field G in the measurement of the magnetic field M becomes large.
  • the tire wear measuring device of the present embodiment is provided with two magnetic field detection units in order to eliminate the influence of the external magnetic field G.
  • the tire wear measuring device of the present invention will be described.
  • FIG. 1 is a cross-sectional view illustrating a state in which a tire wear measuring device according to an embodiment of the present invention is provided on a tire.
  • the tire wear measuring device 10 detects a change in the magnetic field M due to wear of the magnetic body 11 embedded in the tread portion 22 of the outer surface 21 of the tire 20, and detects the detected magnetic field M. It is used to measure the degree of wear of the tread portion 22 of the tire 20. That is, when the magnetic field M is worn together with the tread portion 22 and the size of the magnetic body 11 is reduced, the magnetic field M changes with the change in the size of the magnetic body 11. Therefore, the degree of wear of the tread portion 22 of the tire 20 can be measured by observing the change in the magnetic field M.
  • the magnetic body 11 is embedded in a part of the tread portion 22 on the outer surface 21 of the tire 20, and wears as the tread portion 22 wears. As described above, the magnetic field M formed by the magnetic body 11 changes as the tread portion 22 wears.
  • the first magnetic field detection unit 12 is arranged on the inner surface 23 of the tire 20 at a position directly above the magnetic body 11 which is strongly affected by the magnetic field M generated by the magnetic body 11, that is, at a position where the tire 20 overlaps when viewed from the Y-axis direction.
  • the wear of the tread portion 22 can be measured by the first magnetic field detection unit 12 detecting the magnetic field M due to the magnetic body 11 that changes with wear.
  • the magnetic field detected by the first magnetic field detection unit 12 includes an external magnetic field G in addition to the magnetic field M by the magnetic body 11, and this external magnetic field G causes a decrease in measurement accuracy. Therefore, in the tire wear measuring device 10, the second magnetic field detecting unit 13 is provided at a position where the influence of the magnetic field M by the magnetic body 11 is different from that of the first magnetic field detecting unit 12.
  • the second magnetic field detection unit 13 is provided at a position where the magnetic field M by the magnetic body 11 does not affect. Therefore, the magnetic material from which the external magnetic field G has been removed by using the difference between the first detected value detected by the first magnetic field detecting unit 12 and the second detected value detected by the second magnetic field detecting unit 13.
  • the magnetic field M according to 11 can be measured. Therefore, it is possible to suppress a decrease in detection accuracy due to the influence of the external magnetic field G and accurately measure the wear of the tread portion 22 on the outer surface 21 of the tire 20.
  • the detection value in which the first magnetic field detection unit 12 and the second magnetic field detection unit 13 detect the magnetic field means a value of magnetic flux density or magnetic field strength.
  • the “position not affected by the magnetic field” of the magnetic body 11 embedded in the tread portion 22 means a position where the magnetic flux density of the magnetic field by the magnetic body 11 is substantially zero.
  • the magnetic flux density is substantially 0 means that the magnetic flux density of the magnetic field by the magnetic body 11 is a value sufficiently smaller than the magnetic flux density of the external magnetic field.
  • the magnetic flux density is substantially 0 means that the magnetic flux density of the magnetic field by the magnetic body 11 is sufficiently smaller than the magnetic flux density of the geomagnetism which is the external magnetic field.
  • the position where the magnetic flux density of the magnetic field caused by the magnetic body 11 is 0.05 mT or less is defined as the “position not affected by the magnetic field” of the magnetic body 11.
  • the influence of the magnetic field by the magnetic body 11 is 1/10 or less of the magnetic field of the geomagnetism at all points from the new state to the total wear of the tire.
  • a position of 0.05 mT or less is defined as a “position not affected by the magnetic field” of the magnetic body 11.
  • the second magnetic field detection unit 13 By providing the second magnetic field detection unit 13 at a position where the magnetic field of the magnetic body 11 does not affect, the second detected value detected by the second magnetic field detection unit 13 is only the external magnetic field G. Therefore, by reducing the second detection value of the second magnetic field detection unit 13, only the external magnetic field can be removed from the first detection value of the first magnetic field detection unit 12. Therefore, the change in the magnetic field M due to the wear of the magnetic body 11 provided on the tread portion 22 can be accurately measured.
  • the relative positional relationship between the first magnetic field detection unit 12 and the second magnetic field detection unit 13 with respect to the ground changes periodically with the rotation of the tire 20. Therefore, the influence of the geomagnetism on the detected value also changes periodically. Therefore, the first magnetic field detection unit 12 and the second magnetic field detection unit 13 are in the width direction (X-axis direction) of the tire 20 orthogonal to the rotation direction (Z-axis direction) of the tire 20 on the inner surface 23 of the tire 20. It is provided in parallel.
  • the opposite surface (outer surface 21) of the installation location of the first magnetic field detection unit 12 and the second magnetic field detection unit 13 comes into contact with the ground at the same time as the tire 20 rotates.
  • the first magnetic field detection unit 12 and the second magnetic field detection unit 13 By providing the first magnetic field detection unit 12 and the second magnetic field detection unit 13 in parallel in the width direction orthogonal to the rotation direction of the tire 20, that is, by arranging them on the same straight line in the X-axis direction as described above. , The relative positional relationship between the first magnetic field detection unit 12 and the second magnetic field detection unit 13 with respect to the ground changes in the same manner. Therefore, the first detection value of the first magnetic field detection unit 12 and the second detection value of the second magnetic field detection unit 13 measured at the same time are similarly affected by the external magnetic field G. Therefore, the influence of the external magnetic field G can be removed by using the difference between the first detected value and the second detected value measured at the same time.
  • the mode in which the second magnetic field detection unit 13 is provided at a position where the magnetic field M by the magnetic body 11 does not affect is described.
  • the second magnetic field detection unit 13 may be provided at a position where the influence of the magnetic field M of the magnetic body 11 embedded in the tread portion 22 is different from that of the first magnetic field detection unit 12. If the influence of the magnetic field M is different, the wear of the magnetic body 11 can be measured using the first detected value and the second detected value. For example, the wear of the magnetic body 11 can be measured based on the magnetic field M obtained by excluding the first detected value and the second detected value.
  • the first magnetic field detection unit 12 and the second magnetic field detection unit 13 are provided with a magnetoresistive element that measures a magnetic field and changes the resistance depending on the direction and strength of the magnetic field.
  • the magnetoresistive element include a GMR element and a TMR element.
  • the measurement by the first magnetic field detection unit 12 and the second magnetic field detection unit 13 does not have to be performed continuously in real time, and may be performed intermittently at regular time intervals. Alternatively, the measurement may be performed in response to an external instruction received via a wireless communication means (not shown). By performing the measurement at regular time intervals or in response to instructions, power consumption can be suppressed as compared with continuous measurement.
  • a Hall element may be used as the magnetoresistive element which is the first magnetic field detection unit 12 and the second magnetic field detection unit 13, and the change in the strength of the magnetic flux may be measured.
  • a magnetic impedance effect element may be used to measure the change in impedance due to the change in the magnetic field.
  • the first magnetic field detection unit 12 and the second magnetic field detection unit 13 are configured to be capable of detecting magnetic fields in three axial directions (X-axis, Y-axis, and Z-axis) that are orthogonal to each other.
  • a one-axis sensor for example, when the magnetic body 11, the first magnetic field detection unit 12, and the second magnetic field detection unit 13 deviate from a predetermined position, a part of the magnetism that should be originally detected by the predetermined detection axis is partially detected. , It is projected on a different axis than the detection axis.
  • the first magnetic field detection unit 12 and the second magnetic field detection unit 13 measure the combined magnetic field of the three axes.
  • the first magnetic field detection unit 12 and the second magnetic field detection unit 13 may be configured by using three sensors for 1-axis detection and arranging sensors corresponding to each of the axial directions of the three axes.
  • the first magnetic field detection unit 12 and the second magnetic field detection unit 13 are arranged on the same plane, and each of the three sensitivity axes is arranged so as to face the same direction.
  • a difference is taken for each of the X-axis component, the Y-axis component, and the Z-axis component, and the combined magnetic field of the difference is obtained.
  • Obtain and estimate the amount of wear As a result, the wear of the tread portion 22 of the tire 20 can be detected with high accuracy.
  • the tire wear measuring device 10 outputs information on the wear of the tire 20 based on the measurement of the magnetic field by the first magnetic field detecting unit 12 and the second magnetic field detecting unit 13 to the vehicle side device or the like via wireless communication means or the like. You may. That is, it is possible to transmit the information of the measurement result by the first magnetic field detection unit 12 and the second magnetic field detection unit 13 to the vehicle side device or receive the information from the vehicle side device via the wireless communication means. .. Information transmission / reception by communication between the tire wear measuring device 10 and an external device is controlled by a CPU (not shown).
  • the mode in which the first magnetic field detection unit 12 and the second magnetic field detection unit 13 are provided on the inner surface 23 of the tire 20 has been described.
  • the first magnetic field detection unit 12 and the second magnetic field detection unit 13 may be provided in a place other than the inner side surface 23 of the tire 20, for example, on the vehicle side.
  • FIG. 2 is a cross-sectional view illustrating a modified example of the tire wear measuring device according to the embodiment of the present invention.
  • the tire wear measuring device 30 shown in the figure is different from the wear measuring device 10 of FIG. 1 in that it includes a control unit 31 and a storage unit 32.
  • the control unit 31 wears the tire 20 based on the first detected value detected by the first magnetic field detection unit 12, the second detected value detected by the second magnetic field detection unit 13, and the table of the storage unit 32. It measures the degree.
  • the control unit 31 is composed of a CPU and the like.
  • the storage unit 32 is embedded in the tread portion of the tire 20 from the first detection value detected by the first magnetic field detection unit 12 and the second detection value detected by the second magnetic field detection unit 13. It stores a table used for calculating the amount of wear of the magnetic material 11.
  • a ROM Read Only Memory
  • EEPROM Electrically erasable programmable read-only memory
  • the present invention can also be implemented as a method for measuring tire wear.
  • the magnetic field M generated by the magnetic body 11 embedded in the tread portion 22 of the tire 20 is detected, and the degree of wear of the tire 20 is measured from the change in the magnetic field M.
  • the first magnetic field is detected by the first magnetic field detection unit 12 arranged at a position where the magnetic field M by the magnetic body 11 can be detected, and the influence of the magnetic field of the magnetic body 11 is at a position different from that of the first magnetic field detection unit 12.
  • the second magnetic field is detected by the provided second magnetic field detection unit 13, and based on the first detection value in which the first magnetic field is detected and the second detection value in which the second magnetic field is detected, The degree of wear of the tire 20 is measured.
  • the table stored in the storage unit 32 shows the relationship between the magnetic field M and the degree of wear obtained in advance as in STEP1 to STEP3 below for each initial state of the tire 20 and various degrees of wear.
  • the output values of the sensitivity axes of the first magnetic field detection unit 12 and the second magnetic field detection unit 13 are read. That is, the output A (Xa, Ya, Za) of each axis in the first magnetic field measured by the first magnetic field detection unit 12 is obtained, and each axis in the second magnetic field measured by the second magnetic field detection unit 13.
  • the second magnetic field detection unit 13 is arranged at a position where the magnetic field M does not affect, the output A is affected by the magnetic field M and the external magnetic field G, and the output B is affected by the external magnetic field G. It can be said that it is receiving only.
  • the difference C between the output A and the output B is removed from the influence of the external magnetic field G and only the influence of the magnetic field M. Can be said to have been extracted.
  • the control unit 31 is based on a combined magnetic field m obtained from the first magnetic field and the second magnetic field, and a table stored in the storage unit 32 showing the relationship between the combined magnetic field m and the wear amount w of the tread unit 22. Therefore, the amount of wear w of the tire 20 can be measured.
  • the reference used as the table is not limited to the one that continuously shows the state change of the tire 20, and may be the one that shows the state change of the tire 20 step by step.
  • the tire wear condition is roughly classified into a new condition, a worn condition, and a tire wear condition based on the necessity of tire replacement, and is applicable to the tire wear condition classification.
  • a range of the combined magnetic field m may be set, and the matrix may be used as a table.
  • the slip sign indicating that the tire is worn out and it is time to replace it has the same height as the surface of the tread when the groove depth reaches 1.6 mm, and appears on the tire surface. ing. Therefore, in this case, replace the groove depth of 3.0 mm or more as if it were new, the groove depth of 1.6 to 3.0 mm as wear progressed, and the groove depth of less than 1.6 mm. May be required.
  • a difference is taken for each of the three axis components of the first and second detected values, and the combined magnetic field m of the difference is obtained.
  • the influence of the external magnetic field G included in the first detected value is removed, so that the amount of wear of the tire 20 can be measured accurately. Therefore, for example, it becomes possible to accurately detect the rotation and replacement time of the tire.
  • the present invention can be applied to a tire wear measuring device capable of measuring a tire wear state without visual inspection.
  • Wear measuring device 11 Magnetic material (magnet) 12: First magnetic field detection unit 13: Second magnetic field detection unit 20: Tire 21: Outer surface 22: Tread unit 23: Inner surface 24: Steel wire layer 31: Control unit 32: Storage unit 100: Wear measuring device 111: Magnetism Body (magnet) 112: Magnetic field detector G: External magnetic field M: Magnetic field

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  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Tires In General (AREA)
PCT/JP2021/014348 2020-04-10 2021-04-02 タイヤの摩耗測定装置および摩耗測定方法 Ceased WO2021206023A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE112021002262.8T DE112021002262T5 (de) 2020-04-10 2021-04-02 Abnutzungsmesseinrichtung und abnutzungsmessverfahren für reifen
CN202180025715.0A CN115397678B (zh) 2020-04-10 2021-04-02 轮胎的磨损测定装置以及磨损测定方法
JP2022514047A JP7332791B2 (ja) 2020-04-10 2021-04-02 タイヤの摩耗測定装置および摩耗測定方法
US17/954,143 US12098972B2 (en) 2020-04-10 2022-09-27 Wear measurement device and wear measurement method for tire

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JP2020070842 2020-04-10
JP2020-070842 2020-04-10

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US17/954,143 Continuation US12098972B2 (en) 2020-04-10 2022-09-27 Wear measurement device and wear measurement method for tire

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US (1) US12098972B2 (https=)
JP (1) JP7332791B2 (https=)
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JP7622385B2 (ja) * 2020-09-23 2025-01-28 住友ゴム工業株式会社 タイヤおよび摩耗度検出システム

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CN115397678B (zh) 2024-03-08

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