JP5044974B2 - Pressure sensor for pressure measurement of unvulcanized tires - Google Patents

Pressure sensor for pressure measurement of unvulcanized tires Download PDF

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JP5044974B2
JP5044974B2 JP2006127285A JP2006127285A JP5044974B2 JP 5044974 B2 JP5044974 B2 JP 5044974B2 JP 2006127285 A JP2006127285 A JP 2006127285A JP 2006127285 A JP2006127285 A JP 2006127285A JP 5044974 B2 JP5044974 B2 JP 5044974B2
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pressure
conductive rubber
measurement
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electrode substrate
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JP2007298428A (en
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健太 松田
有二 佐藤
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Yokohama Rubber Co Ltd
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Description

本発明は、可塑性材料の圧力測定用感圧センサーに関し、さらに詳しくは、可塑性材料に作用する圧力を測定する圧力測定用感圧センサーに関する。   The present invention relates to a pressure-sensitive sensor for pressure measurement of a plastic material, and more particularly to a pressure-sensitive sensor for pressure measurement that measures a pressure acting on a plastic material.

タイヤ加硫工程において、未加硫タイヤ内部の圧力を把握することは、特許文献１等に開示されるように製品タイヤの品質管理やタイヤを設計する上で重要な要素である。このような未加硫ゴムに対する圧力を検知するセンサーとしては、図４のように、導電性フィラー配合のシリコンゴム等の感圧導電ゴム２を電極基板３にべた置きし、感圧導電ゴム２が負荷圧力の大きさにより電気抵抗を変化させる特性を利用し、電極部３ａ及び３ｂ間の電圧を検知する圧力測定用感圧センサー１が知られている。しかし、本発明者等の検討した結果によると、この感圧センサーはタイヤ加硫工程で未加硫タイヤに負荷する圧力を測定するときには大きな測定誤差が発生することがわかった。   In the tire vulcanization process, ascertaining the pressure inside the unvulcanized tire is an important factor in quality control of product tires and tire design as disclosed in Patent Document 1 and the like. As a sensor for detecting the pressure with respect to such an unvulcanized rubber, as shown in FIG. 4, a pressure sensitive conductive rubber 2 such as silicon rubber containing a conductive filler is placed on an electrode substrate 3 and the pressure sensitive conductive rubber 2. There is known a pressure measuring sensor 1 for pressure measurement that detects the voltage between the electrode portions 3a and 3b by utilizing the characteristic of changing the electric resistance depending on the magnitude of the load pressure. However, according to the results of the study by the present inventors, it has been found that this pressure-sensitive sensor causes a large measurement error when measuring the pressure applied to the unvulcanized tire in the tire vulcanization process.

その原因は、図５（Ａ）のように、未加硫タイヤ１３と金型１４の間に感圧センサー１を介在させ、図示しないブラダーにより未加硫タイヤ１３に金型１４に向けた圧力が負荷されると、図５（Ｂ）のように、感圧センサー１が未加硫ゴム１３に埋没するため、電極基板３が感圧導電ゴム２の周縁を包み込むように変形して、両者間の接触面積が増大する。この接触面積の変化により出力電圧が変化するため、測定誤差の原因になっていたのである。
特開２００３−１８１８４６号公報 As shown in FIG. 5A, the cause is that the pressure-sensitive sensor 1 is interposed between the unvulcanized tire 13 and the mold 14, and the pressure applied to the mold 14 on the unvulcanized tire 13 by a bladder (not shown). As shown in FIG. 5B, since the pressure sensitive sensor 1 is buried in the unvulcanized rubber 13, the electrode substrate 3 is deformed so as to wrap around the periphery of the pressure sensitive conductive rubber 2. The contact area between them increases. Since the output voltage changes due to the change in the contact area, it causes a measurement error.
JP 2003-181846 A

本発明の目的は、未加硫タイヤの圧力測定において高精度の測定を可能にする未加硫タイヤの圧力測定用感圧センサーを提供することにある。 An object of the present invention is to provide a highly accurate pressure measurement for pressure-sensitive sensor of the unvulcanized tire to enable measurement at pressure measurement unvulcanized tire.

上記目的を達成するための本発明の未加硫タイヤの圧力測定用感圧センサーは、未加硫タイヤの加硫工程においてブラダーから前記未加硫タイヤに負荷される圧力を測定する未加硫タイヤの圧力測定用感圧センサーであって、電極基板（３）に感圧導電ゴム（２）を、前記感圧導電ゴム（２）表面よりも小さな穴（５）が形成された絶縁膜（４）を介在させて、その穴（５）を介してのみ前記電極基板（３）と前記感圧導電ゴム（２）とが接触するように積層するとともに、前記電極基板（３）が前記未加硫タイヤに対向するように配置したことを特徴とする。 The pressure-sensitive sensor for pressure measurement of an unvulcanized tire of the present invention for achieving the above object is an unvulcanized tire that measures a pressure applied to the unvulcanized tire from a bladder in a vulcanization process of the unvulcanized tire. A pressure-sensitive sensor for measuring tire pressure, comprising an electrode substrate (3) having a pressure-sensitive conductive rubber (2) and an insulating film having a hole (5) smaller than the surface of the pressure-sensitive conductive rubber (2) ( 4) with intervening, together with the hole (the electrode substrate only through 5) (3) and the pressure-sensitive conductive rubber (2) are stacked in contact, the electrode substrate (3) is the non It is arranged to face the vulcanized tire .

本発明の未加硫タイヤの圧力測定用感圧センサーによれば、絶縁膜に形成した感圧導電ゴム表面よりも小さな穴を介してのみ感圧導電ゴムと電極基板とが接触するようにしたので、感圧導電ゴムと電極基板の接触面積を測定中において常に一定に保つことができ、可塑性材料に負荷される圧力変化を正確に測定することができる。 According to the pressure-sensitive sensor for pressure measurement of an unvulcanized tire of the present invention, the pressure-sensitive conductive rubber and the electrode substrate are brought into contact only through a hole smaller than the pressure-sensitive conductive rubber surface formed in the insulating film. Therefore, the contact area between the pressure-sensitive conductive rubber and the electrode substrate can always be kept constant during the measurement, and the pressure change applied to the plastic material can be accurately measured.

図１は、本発明の圧力測定用感圧センサーの一例を部品を分解して示す説明図である。
図１に示すように、圧力測定用感圧センサー１は、感圧導電ゴム２、電極基板３及び絶縁膜４からなり、これら三者が一体に積層することにより構成される。絶縁膜４は、感圧導電ゴム２の外形よりも外側に延在する十分な大きさを有すると共に、その中央部に感圧導電ゴム２の表面よりも小さな円形の穴５を有している。この絶縁膜４を感圧導電ゴム２と電極基板３の間に介在させて積層することにより、感圧導電ゴム２と電極基板３は、穴５を介してのみ接触し、常に一定面積で接触するようになっている。 FIG. 1 is an explanatory view showing parts of an example of a pressure sensor for pressure measurement according to the present invention in an exploded manner.
As shown in FIG. 1, the pressure-sensitive sensor 1 for pressure measurement is composed of a pressure-sensitive conductive rubber 2, an electrode substrate 3, and an insulating film 4, and these three members are laminated together. The insulating film 4 has a sufficient size extending outward from the outer shape of the pressure-sensitive conductive rubber 2 and has a circular hole 5 smaller than the surface of the pressure-sensitive conductive rubber 2 at the center. . By laminating the insulating film 4 between the pressure-sensitive conductive rubber 2 and the electrode substrate 3, the pressure-sensitive conductive rubber 2 and the electrode substrate 3 are in contact with each other only through the holes 5, and are always in contact with a certain area. It is supposed to be.

上述した構成の圧力測定用感圧センサー１を、未加硫タイヤの加硫工程で未加硫ゴムに負荷する圧力の測定に使用するときは、図２（Ａ）（Ｂ）のようになる。 The pressure measuring pressure-sensitive sensor 1 of the above-described configuration, when used to measure pressure load unvulcanized rubber vulcanization of the unvulcanized tire is as shown in FIG. 2 (A) (B) .

先ず金型にセットした未加硫タイヤに圧力を負荷しない状態では、圧力測定用感圧センサー１は、図２（Ａ）に示すように、未加硫タイヤの可塑性材料１１と金型の硬質材料１２の間に介在した状態にある。ブラダーの膨張により可塑性材料１１（未加硫タイヤ）に硬質材料１２（金型）に向けて圧力を負荷すると、図２（Ｂ）のように、可塑性材料１１が圧力測定用感圧センサー１を包み込むように変形し、その圧力により圧力測定用感圧センサー１の電極基板３も感圧導電ゴム２を包み込むように変形する。しかし、電極基板３は、感圧導電ゴム２と絶縁膜４の穴５を介してのみ接触しているので、接触面積が変化（増加）せずに、一定の接触面積を保つことができる。したがって、可塑性材料１１に負荷する圧力を高精度に測定することができる。   First, in a state where no pressure is applied to the unvulcanized tire set in the mold, the pressure-sensitive sensor 1 for pressure measurement, as shown in FIG. It is in a state of being interposed between the materials 12. When pressure is applied to the plastic material 11 (unvulcanized tire) toward the hard material 12 (mold) by the expansion of the bladder, the plastic material 11 causes the pressure-sensitive sensor 1 for pressure measurement as shown in FIG. The electrode substrate 3 of the pressure measuring pressure-sensitive sensor 1 is also deformed so as to wrap the pressure-sensitive conductive rubber 2 by the pressure. However, since the electrode substrate 3 is in contact only with the pressure-sensitive conductive rubber 2 through the hole 5 of the insulating film 4, the contact area does not change (increase) and a constant contact area can be maintained. Therefore, the pressure applied to the plastic material 11 can be measured with high accuracy.

図３は、上述した本発明の圧力測定用感圧センサー１と、図４に例示した従来の感圧センサーとを使って、未加硫ゴムに負荷した圧力を検知した実験結果を示す。本発明の圧力測定用感圧センサー１により測定された圧力値は、経時的にプレス機で与えた負荷値とほぼ同じ圧力値が得られたが、従来の感知センサーから得られた圧力値は、接触面積の増加に起因して実際の負荷値よりも大きくなっていることが認められる。 FIG. 3 shows the experimental results of detecting the pressure applied to the unvulcanized rubber using the pressure-sensitive sensor 1 for pressure measurement of the present invention described above and the conventional pressure-sensitive sensor illustrated in FIG. The pressure value measured by the pressure measuring pressure sensor 1 of the present invention was almost the same as the load value given by the press over time, but the pressure value obtained from the conventional sensor was It can be seen that the actual load value is larger due to the increase in the contact area.

本発明において、感圧導電ゴム２は、圧力の大きさに対応して電気抵抗が変化する材料であれば特に限定されない。例えば、導電性フィラー配合のシリコンゴム、ポリフッ化ビニリデンといった高分子圧電材料、チタン酸ジルコン酸鉛のような圧電性セラミック等を例示することができる。感圧導電ゴム２の形状は、好ましくは円形であり、外径が５ｍｍ以上かつ電極基板の最小外形長さ以下であり、厚さが０．５ｍｍ以上かつ２ｍｍ以下であることが好ましい。感圧導電ゴム２の直径及び厚さがこのような範囲を外れると、測定値に影響を及ぼすことがある。 In the present invention, the pressure-sensitive conductive rubber 2 is not particularly limited as long as it is a material whose electric resistance changes according to the magnitude of pressure. For example, it is possible to exemplify polymeric piezoelectric materials such as silicon rubber containing conductive filler, polyvinylidene fluoride, and piezoelectric ceramics such as lead zirconate titanate. The shape of the pressure-sensitive conductive rubber 2 is preferably circular, and the outer diameter of less than or equal to the minimum outer length of and the electrode substrate above 5 mm, it is preferable that the thickness is 0.5mm or more and 2mm or less. If the diameter and thickness of the pressure-sensitive conductive rubber 2 is outside the above range, it may affect the measurement.

絶縁膜４の材料は、電気絶縁性を有し可撓性な材料であれば特に制限されるものではないが、例えば、プラスチックフィルム、合成紙を例示することができる。絶縁膜４に設ける穴５の形状は、特に限定されないが、好ましくは円形がよい。穴５の面積は、感圧導電ゴム２が電極基板３に対面する表面積に対して、好ましくは６０％以上かつ１００％未満とし、より好ましくは７５〜９０％にするとよい。穴５の面積が６０％未満であると、感圧導電ゴム２の性能を十分に発揮することができず、１００％以上であると接触面積の変化が検出されるようになる。 The material of the insulating film 4 is not particularly limited as long as it is an electrically insulating and flexible material, and examples thereof include a plastic film and synthetic paper. The shape of the hole 5 provided in the insulating film 4 is not particularly limited, but is preferably circular. Area of the holes 5, of the surface area of the pressure sensitive conductive rubber 2 is opposed to the electrode substrate 3, preferably 60% or more and less than 100%, more preferably better to 75-90%. If the area of the hole 5 is less than 60%, it can not be sufficiently exhibited performance pressure-sensitive conductive rubber 2, the change in contact touch area and is 100% or more is to be detected.

電極基板３は、少なくとも一対の電極が一定の間隔で設けられた基板であればよい。電極は導電性材料がプリントされたものが一般的である。 The electrode substrate 3 may be a substrate on which at least a pair of electrodes are provided at regular intervals. The electrode is generally printed with a conductive material.

本発明の圧力測定用感圧センサー１は、未加硫タイヤの加硫工程において、金型内の未加硫タイヤに対してブラダーから与えられる圧力の分布を測定するのに用いられる。 Pressure measuring pressure-sensitive sensor 1 of the present invention, in the vulcanization step of the unvulcanized tire, used to measure the distribution of the pressure applied from the bladder against the unvulcanized tire in the mold.

本発明の圧力測定用感圧センサー１により、ブラダーから未加硫タイヤに金型に向け負荷される圧力を測定する場合には、圧力測定用感圧センサー１の電極基板３側を未加硫タイヤに対向するように配置するので、高精度の測定を可能にすることができる。 When the pressure sensor 1 for pressure measurement of the present invention is used to measure the pressure applied to the mold from the bladder to the unvulcanized tire, the electrode substrate 3 side of the pressure sensor 1 for pressure measurement is unvulcanized. Since it arrange | positions so that a tire may be opposed, a highly accurate measurement can be enabled.

未加硫タイヤが金型側に加圧されることにより受ける圧力は金型内面の位置毎に異なるので、圧力測定用感圧センサー１は複数の箇所に分散して設置するとよい。特に金型のトレッド幅方向及び／又はサイドの径方向に分散配置することにより、加硫工程中の受圧順序を測定することができ、また、加硫後のタイヤを離型するときは剥離順序を測定することができる。 Since the pressure received when the unvulcanized tire is pressed on the mold side differs depending on the position of the inner surface of the mold, the pressure measuring pressure sensors 1 may be installed in a plurality of locations. In particular, the pressure receiving order during the vulcanization process can be measured by dispersively arranging in the tread width direction of the mold and / or the radial direction of the side, and the peeling order when releasing the vulcanized tire. Can be measured.

本発明の圧力測定用感圧センサーの一例を部品を分解して示す説明図である。It is explanatory drawing which decomposes | disassembles components and shows an example of the pressure sensor for pressure measurement of this invention. 本発明の圧力測定用感圧センサーを用いた測定形態の一例であり、（Ａ）は非加圧時の状態、（Ｂ）は加圧時の状態を模式的に示す説明図である。It is an example of the measurement form using the pressure sensitive sensor for pressure measurement of this invention, (A) is the state at the time of non-pressurization, (B) is explanatory drawing which shows the state at the time of pressurization typically. 本発明の圧力測定用感圧センサーを使用した測定結果の一例を示す説明図である。It is explanatory drawing which shows an example of the measurement result using the pressure-sensitive sensor for pressure measurement of this invention. 従来の圧力測定用感圧センサーの一例を示す説明図である。It is explanatory drawing which shows an example of the conventional pressure sensor for pressure measurement. 従来の圧力測定用感圧センサーを用いた測定形態の一例であり、（Ａ）は非加圧時の状態、（Ｂ）は加圧時の状態を模式的に示す説明図である。It is an example of the measurement form using the conventional pressure sensor for pressure measurement, (A) is the state at the time of non-pressurization, (B) is explanatory drawing which shows the state at the time of pressurization typically.

符号の説明Explanation of symbols

１ 圧力測定用感圧センサー
２ 感圧導電ゴム
３ 電極基板
４ 絶縁膜
５ 穴
１１ 可塑性材料
１２ 硬質材料 DESCRIPTION OF SYMBOLS 1 Pressure-sensitive sensor for pressure measurement 2 Pressure-sensitive conductive rubber 3 Electrode board 4 Insulating film 5 Hole 11 Plastic material 12 Hard material

Claims (3)

未加硫タイヤの加硫工程においてブラダーから前記未加硫タイヤに負荷される圧力を測定する未加硫タイヤの圧力測定用感圧センサーであって、
電極基板（３）に感圧導電ゴム（２）を、前記感圧導電ゴム（２）表面よりも小さな穴（５）が形成された絶縁膜（４）を介在させて、その穴（５）を介してのみ前記電極基板（３）と前記感圧導電ゴム（２）とが接触するように積層するとともに、前記電極基板（３）が前記未加硫タイヤに対向するように配置した未加硫タイヤの圧力測定用感圧センサー。 A pressure-sensitive sensor for pressure measurement of an unvulcanized tire that measures a pressure applied to the unvulcanized tire from a bladder in a vulcanization process of the unvulcanized tire,
The pressure sensitive conductive rubber (2) the electrode substrate (3), wherein the pressure-sensitive conductive rubber (2) with small holes (5) is interposed an insulating film (4) which is formed from the surface, the hole (5) together with the said pressure-sensitive conductive rubber and the electrode substrate (3) (2) are stacked in contact only through, unvulcanized which the electrode substrate (3) is arranged so as to face the unvulcanized tire Pressure sensor for pressure measurement of sulfur tires . 前記絶縁膜（４）に形成された穴（５）の大きさが、前記電極基板（３）に対面する側の感圧導電ゴム（２）の表面積の６０％以上かつ１００％未満である請求項１に記載の未加硫タイヤの圧力測定用感圧センサー。 The size of the hole formed in the insulating film (4) (5) is 60% or more and less than 100% of the surface area of the side of the pressure-sensitive conductive rubber facing said electrode substrate (3) (2) wherein Item 2. A pressure-sensitive sensor for measuring pressure of an unvulcanized tire according to Item 1. 前記感圧導電ゴム（２）が、５ｍｍ以上かつ前記電極基板（３）の最小外形長さ以下の外径を有する円形であるとともに、その厚さが０．５ｍｍ以上かつ２．０ｍｍ以下である請求項１又は２に記載の未加硫タイヤの圧力測定用感圧センサー。 The pressure-sensitive conductive rubber (2) is a circle having an outer diameter of 5 mm or more and not more than the minimum outer length of the electrode substrate (3) , and the thickness thereof is 0.5 mm or more and 2.0 mm or less. The pressure sensor for pressure measurement of the unvulcanized tire according to claim 1 or 2.
JP2006127285A 2006-05-01 2006-05-01 Pressure sensor for pressure measurement of unvulcanized tires Expired - Fee Related JP5044974B2 (en)

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KR101084782B1 (en) 2010-05-06 2011-11-21 삼성전기주식회사 Touch screen device
US9656434B2 (en) 2010-11-30 2017-05-23 The Good Year Tire & Rubber Company Measuring tire pressure in a tire mold
JP6880583B2 (en) * 2016-07-11 2021-06-02 ニプロ株式会社 Pressure measuring device
CN108426657A (en) * 2018-02-08 2018-08-21 浙江大学 A kind of multiple stage array pressure sensor of multiple field

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US6909354B2 (en) * 2001-02-08 2005-06-21 Interlink Electronics, Inc. Electronic pressure sensitive transducer apparatus and method for manufacturing same
JP2003181846A (en) * 2001-12-21 2003-07-02 Bridgestone Corp Method for monitoring tire vulcanization and device used in the method
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