JPH02188237A - Manufacture of radial tire - Google Patents
Manufacture of radial tireInfo
- Publication number
- JPH02188237A JPH02188237A JP1008975A JP897589A JPH02188237A JP H02188237 A JPH02188237 A JP H02188237A JP 1008975 A JP1008975 A JP 1008975A JP 897589 A JP897589 A JP 897589A JP H02188237 A JPH02188237 A JP H02188237A
- Authority
- JP
- Japan
- Prior art keywords
- tread
- tire
- lug grooves
- rubber
- vulcanization
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 229920001971 elastomer Polymers 0.000 claims abstract description 50
- 239000005060 rubber Substances 0.000 claims abstract description 50
- 238000004073 vulcanization Methods 0.000 claims abstract description 22
- 239000011324 bead Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000010276 construction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 102100023170 Nuclear receptor subfamily 1 group D member 1 Human genes 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
- Tires In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ラグ溝を有するラジアルタイヤにおいて、シ
ョルダ部の波打ちを減じることにより、ベルト層の剥離
を防止できかつ完成されたタイヤの見映えを向上しろる
ラジアルタイヤの製造方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a radial tire having lug grooves that can prevent peeling of the belt layer and improve the appearance of the finished tire by reducing waving at the shoulder portion. The present invention relates to a method for manufacturing a radial tire that improves performance.
ラジアルタイヤ、特にトラック、バスなどの重荷重用ラ
ジアルタイヤにあっては、トレッド部にはラグ溝が配さ
れ、又そのラグ溝はトレッド端に延びている。In radial tires, particularly radial tires for heavy loads such as trucks and buses, lug grooves are arranged in the tread portion, and the lug grooves extend to the tread ends.
又このようなトレッド部は、従来、第７図に示すような
断面台形かつ均一形状の帯状体をなす生ゴムシートａを
タイヤ基体の外周面に巻付け、貼付けるとともに、タイ
ヤ基体とともに金型内で加硫するとともに、その又加硫
時において、金型に予め形成されたトレッドパターンに
ゴムシートａを押付はゴムシートａを押圧し変形するこ
とによってラグ溝を形成していた。Conventionally, such a tread part is made by wrapping and pasting a raw rubber sheet a in the form of a band with a trapezoidal cross section and a uniform shape as shown in Fig. At the same time, during vulcanization, the rubber sheet a was pressed against a tread pattern previously formed in a mold, and the rubber sheet a was pressed and deformed to form lug grooves.
前記の如く加硫時にトレッドパターンを同時に形成する
ことによって、ブロック部すにおいては隆起しかつ溝部
Ｃにおいては沈降する。又前記押圧によって、トレッド
シートａの形状は変化し、その形状変化によってベルト
層ｄ５カーカスｅは、ブロック部すと溝部Ｃとの間で波
打ちが生じる。By simultaneously forming the tread pattern during vulcanization as described above, the block portions are raised and the groove portions C are depressed. Moreover, the shape of the tread sheet a changes due to the pressing, and due to the shape change, the belt layer d5 carcass e becomes wavy between the block portion and the groove portion C.
このような波打ちはシッルダ部において著しく、その結
果ベルト層ｄ端部がゴム層から剥離しがちであり、トレ
ッド部の耐久性を低下させることとなる。他方、タイヤ
軸方向にのびるラグ溝によって、ベルト層ｄはタイヤの
円周方向に波打ちが生じ、この波打ちがタイヤ外観にお
いてもサイドウオール部にアンジュレーションを起こす
。Such undulation is noticeable in the shield portion, and as a result, the end portion of the belt layer d tends to peel off from the rubber layer, reducing the durability of the tread portion. On the other hand, due to the lug grooves extending in the axial direction of the tire, the belt layer d is undulated in the circumferential direction of the tire, and this undulation also causes undulations in the sidewall portion of the tire.
前記サイドウオール部のアンジュレーションを防ぐため
サイドウオール部の厚みを増大することも考えられるが
、厚みの増大によってタイヤの重量が増す結果、コスト
アップとなり、しかも前記ベルト層の剥離防止対策には
寄与していない。It is possible to increase the thickness of the sidewall portion in order to prevent undulation of the sidewall portion, but the increase in thickness increases the weight of the tire, resulting in an increase in cost, and it does not contribute to preventing peeling of the belt layer. I haven't.
本発明はトレッド部を形成する生カバーに、その加硫に
先立ちラグ溝形成部分に凹部を予め形成することを基本
として、ベルト層端部の剥離を防□止でき、トレッド部
の耐久性を高めるとともにタイヤの見映えを向上しうる
ラジアルタイヤの製造方法の提供を目的としている。The present invention is based on forming recesses in advance in the lug groove forming portion of the raw cover that forms the tread portion before vulcanization, which prevents peeling of the end of the belt layer and improves the durability of the tread portion. The purpose of the present invention is to provide a method for manufacturing a radial tire that can improve the appearance of the tire.
前記問題点を解決するため本発明のラジアルタイヤの製
造方法にあっては、トレッド部からサイドウオール部を
へてビード部のビードコアの廻りを折返すカーカスと、
該カーカスの半径方向外側かつトレッド部の内方に配さ
れるベルト層とを具えるとともに、トレッド部のシッル
ダ側にラグ溝と該ラグ溝間で隆起するブロックとを交互
に並設したラジアルタイヤの製造方法であって、生タイ
ヤ基体の外周面に、トレッド部を形成するトレッド生ゴ
ムシートを取付は生カバーを形成するとともに、この生
カバーの加硫により形成される前記タイヤのトレッド巾
（ＴＷ）の３／８倍をタイヤ軸方向にタイヤ赤道から隔
てる位置とトレッド端縁との間において前記ラグ溝部分
に含まれるトレッドゴム体積（ＶＧ）と、ブロック部分
に含まれるトレッドゴムのゴム体積（ＶＢ）との体積差
ＳＯ（＝ＶＢ〜ＶＧ） の０．８倍よりも大か９１．２
倍よりも小な容積（Ｓ）を有する凹部を前記生カバーの
加硫に先立ち前記トレッド生ゴムシートにしかも加硫金
型のラグ溝形成部分に位置して予め形成する方法である
。In order to solve the above-mentioned problems, the method for manufacturing a radial tire of the present invention includes a carcass that is folded back from the tread part through the sidewall part and around the bead core of the bead part;
A radial tire comprising: a belt layer disposed on the radially outer side of the carcass and on the inner side of the tread portion; and lug grooves and blocks protruding between the lug grooves are alternately arranged in parallel on the sillder side of the tread portion. In this manufacturing method, a tread raw rubber sheet forming a tread portion is attached to the outer peripheral surface of a raw tire base to form a raw cover, and the tread width (TW) of the tire is formed by vulcanization of the raw cover. ) is 3/8 times the tread rubber volume (VG) included in the lug groove portion between the position separating the tire equator from the tire equator in the tire axial direction and the tread edge, and the rubber volume (VG) of the tread rubber included in the block portion. VB) is larger than 0.8 times the volume difference SO (=VB~VG) or 91.2
This is a method in which a recessed portion having a volume (S) smaller than the double volume is preliminarily formed in the tread raw rubber sheet and located in the lug groove forming portion of the vulcanization mold prior to vulcanization of the raw cover.
、該生カバーの加硫に先立ち、その生カバーを形成する
トレッド生ゴムシートに凹部を予め形成する方法である
ため、凹部の形成は容易になしうる。Since this is a method in which recesses are previously formed in the tread raw rubber sheet forming the raw cover prior to vulcanization of the raw cover, the recesses can be easily formed.
しかも凹部の容積Ｓをトレッド巾ＴＷの３／８倍タイヤ
赤道から隔てた位置とトレッド端縁間においてラグ溝部
分とブロック部分の体積差の０．８倍〜１．２倍の範囲
に規制しているため加硫金型によってラグ溝を成形する
場合にあっても、生カバー容積変化は殆ど生じない。従
ってベルト層はラグ溝下方において凹む波打ちが生じな
いため、ベルト端部におけるゴム層との間の剥離がなく
トレッド部の耐久性を高めることができる。又前記の如
くベルト層の波打ちが減少することによって、トレッド
部には波状の変形がなく、走行の安定性が向上しかつ商
品価値を高める。Moreover, the volume S of the recess is limited to 3/8 times the tread width TW and 0.8 to 1.2 times the volume difference between the lug groove portion and the block portion between the position away from the tire equator and the tread edge. Therefore, even when forming lug grooves using a vulcanization mold, there is almost no change in the raw cover volume. Therefore, since the belt layer does not have undulations that are concave below the lug grooves, there is no separation between the belt layer and the rubber layer at the end of the belt, and the durability of the tread portion can be increased. Further, as described above, since the waving of the belt layer is reduced, the tread portion is free from wavy deformation, improving running stability and increasing commercial value.
以下本発明の一実施例を図面に基づき説明する。 An embodiment of the present invention will be described below based on the drawings.
第１〜５図において本発明のラジアルタイヤの製造方法
（以下製造方法という）は、ラジアルタ。1 to 5, the method for manufacturing a radial tire (hereinafter referred to as manufacturing method) of the present invention is a radial tire.
イヤ１のトレッド部２を形成する生カバー３に、その加
硫に先立ち凹部を予め形成する方法である。This is a method in which a concave portion is previously formed in the raw cover 3 that forms the tread portion 2 of the ear 1 prior to its vulcanization.
ラジアルタイヤ１はビードコア５が通ると一ド部６と、
該ビード部６から半径方向外側にのびるサイドウオール
７を立上げるとともに、サイドウオール７を継ぐ前記ト
レッド部２を具えている。When the bead core 5 passes through the radial tire 1, a bead portion 6 is formed.
A sidewall 7 extending radially outward from the bead portion 6 is raised, and the tread portion 2 is provided to join the sidewall 7.
又ラジアルタイヤ１は、前記トレッド部２からサイドウ
オール７を通りビード部６のビードコア５の周りを折返
すカーカス９と、該カーカス９のりイヤ半径方向外側か
つビード部２内方に複数枚のベルトブライからなるベル
ト層１０を具える。The radial tire 1 also includes a carcass 9 that passes from the tread portion 2 through the sidewall 7 and folds around the bead core 5 of the bead portion 6, and a plurality of belts located outside the carcass 9 in the radial direction and inside the bead portion 2. A belt layer 10 made of braai is provided.
カーカス９は、スチール、又はポリエステル、ナイロン
等の繊維コードをタイヤ赤道Ｃに対して７０〜９０°傾
は配列したラジアル配列体をなす。The carcass 9 is a radial arrangement body in which fiber cords made of steel, polyester, nylon, etc. are arranged at an angle of 70 to 90 degrees with respect to the tire equator C.
ベルト層１０は、本実施例では、カーカス９側から外側
に向かって第１のベルトプライ２１、第２のベルトプラ
イ２２、第３のベルトプライ２３、第４のベルトプライ
２４の順に配列した４枚のベルトブライからなり、各ベ
ルトブライは、スチールナイロン、ポリエステル等のコ
ードを隣り合うベルトプライの間において交差する向き
に配設される。カーカス９、ベルト層１０は、前記サイ
ドウオール７、ビード部６、その外側をゴム被覆するこ
とによりタイヤ基体２６を形成するとともに、前記ベル
ト層１０の外側にゴム層２７を設けることにより、前記
ラジアルタイヤ１が形成される。In this embodiment, the belt layer 10 includes four belt plies arranged in the order of a first belt ply 21, a second belt ply 22, a third belt ply 23, and a fourth belt ply 24 outward from the carcass 9 side. The belt bridle consists of two belt briais, and each belt briai has cords made of steel nylon, polyester, etc. arranged in a direction that intersects between adjacent belt plies. The carcass 9 and the belt layer 10 form a tire base 26 by coating the sidewall 7, the bead portion 6, and the outside thereof with rubber, and also provide a rubber layer 27 outside the belt layer 10 to form the tire base 26. A tire 1 is formed.
ゴム層２７は、その外周面に少なくともトレッド部３の
両側に位置するショルダｌｌ側に第２図に示す如く複数
本のラグ溝１２と該ラグ溝１２．１２間において隆起す
る複数個のブロック１３とを交互に並設している。The rubber layer 27 has a plurality of lug grooves 12 and a plurality of blocks 13 raised between the lug grooves 12 and 12, as shown in FIG. They are placed alternately in parallel.
前記ベルト層１０は、ベルトブライ２１．２２．２３．
２４の各コードを交差する向きに配設しているためタガ
効果を発揮してトレッド部３の剛性を高めるとともに、
第３のベルトブライ２３を巾広に形成し、その端部Ｆを
トレッド端縁り近傍まで延在させることによって、トレ
ッド部２のショルダ１１の剛性を保持している。The belt layer 10 includes belt braids 21, 22, 23.
Since each of the 24 cords is arranged in an intersecting direction, it exhibits a hoop effect and increases the rigidity of the tread portion 3.
The rigidity of the shoulder 11 of the tread portion 2 is maintained by forming the third belt braai 23 wide and extending its end F to near the tread edge.
又ショルダ１１の前記カーカス９の外側には軟質ゴムか
らなるブレーカークッシゴン２９が配設される。Further, a breaker cushion 29 made of soft rubber is provided on the outside of the carcass 9 of the shoulder 11.
前記ゴム層２７は次に述べる製造工程により製作される
。The rubber layer 27 is manufactured by the manufacturing process described below.
１）トレッド巾ＴＷに略等しい巾寸度を具える帯状をな
しかつ両側縁に第５図に示すような凹部４を設けた未加
硫のトレッド生ゴムシート１４を形成する。1) An unvulcanized tread raw rubber sheet 14 is formed in the shape of a band having a width approximately equal to the tread width TW and provided with recesses 4 as shown in FIG. 5 on both side edges.
２）カーカス９をトロイド状に形成しかつベルト層１０
取付け、カーカス９の内向き面、外向き面に加硫前のイ
ンナゴム３１、アウタゴム３２を夫々貼付けかつトレッ
ド部２に前記ブレーカ−クツション２９により生タイヤ
基体１５を形成する。又生タイヤ基体１５は、加硫する
ことによって前記タイヤ基体２６を形成しうる。2) Forming the carcass 9 into a toroidal shape and forming the belt layer 10
Attachment: unvulcanized inner rubber 31 and outer rubber 32 are attached to the inward and outward facing surfaces of carcass 9, respectively, and green tire base 15 is formed on tread portion 2 with the breaker cushion 29. Further, the green tire base 15 can be vulcanized to form the tire base 26.
３）前記トレッド生ゴムシート１４をベルト層１０の外
面、即ち生タイヤ基体１５の外周面１６に巻付ける。従
ってトレッド生ゴムシート１４が生タイヤ基体１５に取
付く生カバー３を形成する。3) Wrap the tread raw rubber sheet 14 around the outer surface of the belt layer 10, that is, the outer peripheral surface 16 of the green tire base 15. Therefore, the tread raw rubber sheet 14 forms the raw cover 3 attached to the raw tire base 15.
４）生カバー３が取付く生タイヤ基体１５を加硫金型に
装入し加硫する。なお加硫金型には前記ラグ溝１２を形
成するための突起部が設けられており、生カバー３を加
硫する際に同時にラグ溝１２を含めたタイヤのブロック
パ゛ターンが形成される。また生カバー３は外周面にラ
グ溝１２が形成されかつ加硫されることにより前記ゴム
２７層を形成する。4) The green tire base 15 to which the green cover 3 is attached is charged into a vulcanization mold and vulcanized. The vulcanization mold is provided with a protrusion for forming the lug grooves 12, and when the raw cover 3 is cured, the block pattern of the tire including the lug grooves 12 is formed at the same time. . Furthermore, the green cover 3 has lug grooves 12 formed on its outer peripheral surface and is vulcanized to form the rubber 27 layer.
トレッド生ゴムシート１４に設ける前記凹部４の位置及
び大きさは下記の方法によって設定される。The position and size of the recess 4 provided in the tread raw rubber sheet 14 are set by the following method.
ａ）凹部４の容積は、トレッド部２のショルダ１１側に
おけるラグ溝１２部分に含まれるトレッドゴムのゴム体
積（以下ラグ溝部分のゴム体積という）ＶＣと、ブロッ
ク１３部分に含まれるトレッドゴムのゴム体積（以下ブ
ロック部分のゴム体積という）ＶＢとの体積差ＳＯに関
連づけて設定される。a) The volume of the recess 4 is determined by the rubber volume VC of the tread rubber included in the lug groove 12 portion on the shoulder 11 side of the tread portion 2 (hereinafter referred to as the rubber volume of the lug groove portion) and the tread rubber volume contained in the block 13 portion. The rubber volume (hereinafter referred to as the rubber volume of the block portion) is set in relation to the volume difference SO with VB.
ｂ）ショルダ１１側を設定することによって、ベルト層
１０に生じる波打ちの著しい範囲、及び波打ちによるベ
ルト層１０端部の剥離が生じ易い部分を限定することが
できる。b) By setting the shoulder 11 side, it is possible to limit the range of significant undulation that occurs in the belt layer 10 and the portion where peeling of the end portion of the belt layer 10 is likely to occur due to the undulation.
Ｃ）ラグ溝部分のゴム体積ｖＧは、前記３／８点Ｐから
トレッド端縁りに至る距離と、ラグ溝１２の溝底から内
腔８面に至る厚みとの積によって算出され、又ブロック
部分のゴム体積ＶＢは、前記３／８点Ｐからトレッド端
縁りに至る距離とブロック１３の外周面から内腔８面に
至る厚みとの積によって算出される。C) The rubber volume vG of the lug groove portion is calculated by the product of the distance from the 3/8 point P to the tread edge and the thickness from the bottom of the lug groove 12 to the surface of the inner cavity 8. The rubber volume VB of the portion is calculated by the product of the distance from the 3/8 point P to the tread edge and the thickness from the outer peripheral surface of the block 13 to the inner cavity 8 surface.
ｄ）又トレッド生ゴムシート１４に設ける前記凹部４の
容積Ｓは、ラグ溝部分のゴム体積ＶＧとブロック部分の
ゴム体積ＶＢとの体積差ＳＯ（−ＶＢ−ＶＣ）の０．８
倍よりも大かつ１．２倍よりも小な容積Ｓとし、しかも
凹部４は加硫金型のラグ溝形成部分に位置して形成され
る。d) Also, the volume S of the recess 4 provided in the tread raw rubber sheet 14 is 0.8 of the volume difference SO (-VB-VC) between the rubber volume VG of the lug groove portion and the rubber volume VB of the block portion.
The volume S is larger than 1.2 times and smaller than 1.2 times, and the recessed portion 4 is formed at the lug groove forming portion of the vulcanization mold.
前記体積差ＳＯが０．８倍よりも小であるならば加硫金
型によるタイヤ成形時において凹部４近傍に位置する生
カバー３のゴムはブロック１３側に移動しその移動によ
るベルト層１０はブロック１３の位置で第６図に示すよ
うに外側に清白する波打ちが生じる。又体積差ＳＯが１
．２倍よりも大となると、生カバー３のゴムは成形時に
おいて、ブロック１３側からラグ溝１２の部分に移動し
、ベルト層１０は第６図とは逆にラグ溝１２の部分で隆
起する波打ちが生じることとなる。前記凹部４の形成は
、トレッド生ゴムシート１４の成形時において金型によ
る押圧成形の他、切削等により削り取ってもよい。If the volume difference SO is smaller than 0.8 times, the rubber of the raw cover 3 located near the concave portion 4 moves toward the block 13 side during tire molding with a vulcanization mold, and the belt layer 10 due to this movement moves. At the position of the block 13, as shown in FIG. 6, clear white undulations occur on the outside. Also, the volume difference SO is 1
．． If it becomes larger than twice, the rubber of the raw cover 3 moves from the block 13 side to the lug groove 12 part during molding, and the belt layer 10 rises in the lug groove 12 part, contrary to FIG. 6. Ripples will occur. The recess 4 may be formed by pressing the tread rubber sheet 14 with a mold or by scraping it off by cutting or the like.
このように本願の製造方法においてはタイヤの加硫及び
ラグ溝成形に先立ち、生カバー３にラグ溝１２相当位置
に凹部４が設けているため、ラグ溝１２は精度よく成形
しうるのみならず、ショルダ部１１部におけるベルト層
１０の波打ち、及びベルト層１０端部剥離を防止するこ
とができる。In this manner, in the manufacturing method of the present application, the recesses 4 are provided in the raw cover 3 at positions corresponding to the lug grooves 12 prior to tire vulcanization and lug groove forming, so the lug grooves 12 can not only be formed with high precision but also It is possible to prevent the belt layer 10 from waving at the shoulder portion 11 and from peeling off the ends of the belt layer 10.
ちなみに本発明の製造方法によるラジアルタイヤ１は、
カーカス１０端部における波打ちの波高さが、凹部を設
けない従来の製造によるタイヤに比べて、２０％以下に
軽減された。又本発明の製造方法によって製造されたラ
ジアルタイヤｌをＪＡＴＭＡに定める１００％荷重を加
えて８０Ｉａｌの距離を走行する走行試験を行った。走
行後におけるショルダ部の発熱温度が従来の製法による
ものに比べて約５度低いという結果を得た。このように
発熱量が少ないことからベルト層端部の剥離を防止でき
、トレッド部の耐久性が高まるごとが判明した。Incidentally, the radial tire 1 produced by the manufacturing method of the present invention is
The height of the corrugation at the end of the carcass 10 was reduced to 20% or less compared to a conventionally manufactured tire without a recess. Further, a running test was conducted in which the radial tire l manufactured by the manufacturing method of the present invention was run for a distance of 80 Ial while applying a 100% load specified by JATMA. The result was that the heat generation temperature of the shoulder portion after running was approximately 5 degrees lower than that produced using the conventional manufacturing method. It has been found that since the amount of heat generated is small in this way, it is possible to prevent peeling of the end portions of the belt layer, thereby increasing the durability of the tread portion.
畝上の如く本発明の製造方法はトレッド部を形成する生
カバーに、その加硫に先立ちラグ溝の形成される位置に
予め凹部を形成することを要旨とするため、従来発生し
がちであったラグ溝成形及び加硫によるベルト層の波打
ちを減少できる。As with the ridges, the manufacturing method of the present invention involves forming recesses in advance at the positions where the lug grooves are to be formed in the raw cover that forms the tread portion prior to vulcanization. Waving of the belt layer due to lug groove forming and vulcanization can be reduced.
又前記凹部の容積を、トレッド巾の３／８倍から外縁ま
でのショルダ部におけるラグ溝部とブロック部との容積
差に対する比率で規制したため、前記波打ちをより効果
的に減少できかつ走行による発熱量を減少しうることに
より、ベルト層端部の剥離を防止できトレッド部の耐久
性を高めしかも外観向上に役立つ。In addition, since the volume of the recessed portion is regulated by the ratio to the volume difference between the lug groove portion and the block portion in the shoulder portion from 3/8 times the tread width to the outer edge, the waving can be more effectively reduced and the amount of heat generated during running can be reduced. By being able to reduce this, it is possible to prevent peeling of the end portion of the belt layer, increase the durability of the tread portion, and also help improve the appearance.
第１図は本発明の一実施例を示すタイヤ右半分断面図、
第２図はそのショルダ側のラグ溝を示す部分側面図、第
３図は第２図のＡ−Ａ’線断面を略示する断面図、第４
図は第２図のＢ−Ｂ’線断面を略示する断面図、第５図
はトレッド生ゴムシートを示す斜視図、第６図は従来技
術を示す断面図、第７図は従来のトレッド生ゴムシート
を示す斜視図である。
６・−・−・ビード部、 ７−サイドウオール部、９
・−・−カーカス、 １０・−・ベルト層、１１・・
・・・ショルダ、 １２・−・ラグ溝、１３−・ブロ
ック、 １４−・トレッド生ゴムシート、１５・・・
−生タイヤ基体、 １６・・−外周面、Ｃ・・・・・
タイヤ赤道、 Ｄ−・トレッド端縁、Ｓ・−・・凹部
の容積、 ＳＯ−・・・体積差、ＴＷ・・・・・トレッ
ド巾、 ＶＢ・・・・ブロック部の体積、ＶＣ・−・
ラグ溝の体積。
特許出願人 住友ゴム工業株式会社代理人
弁理士 苗 村 正１−・−・・ラジ
アルタイヤ、 ２−・トレッド部、３−・生カバー
４−凹部、 ５−・・ビードコア、第２
図
竹５ｔσ
第３ｉｉ１
冒
第４
悶
１１７ＷＩFIG. 1 is a right half sectional view of a tire showing an embodiment of the present invention;
Fig. 2 is a partial side view showing the lug groove on the shoulder side, Fig. 3 is a sectional view schematically showing the cross section taken along the line A-A' in Fig. 2, and Fig.
The figure is a cross-sectional view schematically showing the section taken along the line B-B' in Figure 2, Figure 5 is a perspective view showing a tread raw rubber sheet, Figure 6 is a cross-sectional view showing the conventional technology, and Figure 7 is a conventional tread raw rubber sheet. It is a perspective view showing a seat. 6--Bead part, 7-Side wall part, 9
・−・−Carcass, 10・−・Belt layer, 11・・
...Shoulder, 12--Lug groove, 13--Block, 14--Tread raw rubber sheet, 15--
- Green tire base, 16... - Outer circumferential surface, C...
Tire equator, D--Tread edge, S-- Volume of recess, SO-- Volume difference, TW... Tread width, VB... Volume of block part, VC--...
Volume of lug groove. Patent applicant Sumitomo Rubber Industries Co., Ltd. Agent
Patent Attorney Tadashi Naemura 1-- Radial tire, 2- Tread section, 3- Raw cover
4-Concave part, 5-... Bead core, 2nd figure bamboo 5tσ 3rd ii1 4th attack 117WI
Claims (1)
ビードコアの廻りを折返すカーカスと、該カーカスの半
径方向外側かつトレッド部の内方に配されるベルト層と
を具えるとともに、トレッド部のショルダ側にラグ溝と
該ラグ溝間で隆起するブロックとを交互に並設したラジ
アルタイヤの製造方法であって、生タイヤ基体の外周面
に、トレッド部を形成するトレッド生ゴムシートを取付
け生カバーを形成するとともに、この生カバーの加硫に
より形成される前記タイヤのトレッド巾（ＴＷ）の３／
８倍をタイヤ軸方向にタイヤ赤道から隔てる位置とトレ
ッド端縁との間において前記ラグ溝部分に含まれるトレ
ッドゴム体積（ＶＧ）と、ブロック部分に含まれるトレ
ッドゴムのゴム体積（ＶＢ）との体積差ＳＯ（＝ＶＢ〜
ＶＧ）の０．８倍よりも大かつ１．２倍よりも小な容積
（Ｓ）を有する凹部を前記生カバーの加硫に先立ち前記
トレッド生ゴムシートにしかも加硫金型のラグ溝形成部
分に位置して予め形成することを特徴とする請求項１記
載のラジアルタイヤの製造方法。1. A carcass that passes from the tread portion through the sidewall portion and folds around the bead core of the bead portion, and a belt layer disposed on the radially outer side of the carcass and inside the tread portion, and the shoulder layer of the tread portion. A method for manufacturing a radial tire in which lug grooves and blocks protruding between the lug grooves are arranged alternately in parallel on the sides, the tread raw rubber sheet forming the tread portion being attached to the outer peripheral surface of the raw tire base, and the raw cover being attached. 3/3 of the tread width (TW) of the tire formed by vulcanization of this green cover.
The tread rubber volume (VG) contained in the lug groove portion and the rubber volume (VB) of the tread rubber contained in the block portion between the tread edge and the position separating 8 times the tire equator in the tire axial direction. Volume difference SO (=VB~
Prior to vulcanization of the raw cover, a recess having a volume (S) larger than 0.8 times and smaller than 1.2 times VG) is formed in the tread raw rubber sheet and in the lug groove forming portion of the vulcanization mold. 2. The method for manufacturing a radial tire according to claim 1, wherein the radial tire is formed in advance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1008975A JPH0671772B2 (en) | 1989-01-17 | 1989-01-17 | Radial tire manufacturing method |
| DE19904000926 DE4000926A1 (en) | 1989-01-17 | 1990-01-15 | Uncured tyre tread strip - has tread layer with grooves along edges with specific relationship to difference in vol. of grooved and raised areas in final cured tread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1008975A JPH0671772B2 (en) | 1989-01-17 | 1989-01-17 | Radial tire manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02188237A true JPH02188237A (en) | 1990-07-24 |
| JPH0671772B2 JPH0671772B2 (en) | 1994-09-14 |
Family
ID=11707688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1008975A Expired - Lifetime JPH0671772B2 (en) | 1989-01-17 | 1989-01-17 | Radial tire manufacturing method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0671772B2 (en) |
| DE (1) | DE4000926A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007313836A (en) * | 2006-05-29 | 2007-12-06 | Yokohama Rubber Co Ltd:The | Method and device for manufacturing pneumatic tire, and pneumatic tire |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4308083A (en) * | 1980-03-26 | 1981-12-29 | The Goodyear Tire & Rubber Company | Pneumatic tire and method of building a pneumatic tire |
-
1989
- 1989-01-17 JP JP1008975A patent/JPH0671772B2/en not_active Expired - Lifetime
-
1990
- 1990-01-15 DE DE19904000926 patent/DE4000926A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007313836A (en) * | 2006-05-29 | 2007-12-06 | Yokohama Rubber Co Ltd:The | Method and device for manufacturing pneumatic tire, and pneumatic tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0671772B2 (en) | 1994-09-14 |
| DE4000926C2 (en) | 1993-03-11 |
| DE4000926A1 (en) | 1990-07-19 |
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