JPH07156288A - Manufacture of toothed belt of polyurethane - Google Patents
Manufacture of toothed belt of polyurethaneInfo
- Publication number
- JPH07156288A JPH07156288A JP34065293A JP34065293A JPH07156288A JP H07156288 A JPH07156288 A JP H07156288A JP 34065293 A JP34065293 A JP 34065293A JP 34065293 A JP34065293 A JP 34065293A JP H07156288 A JPH07156288 A JP H07156288A
- Authority
- JP
- Japan
- Prior art keywords
- belt
- core
- tooth
- polyurethane
- toothed belt
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はポリウレタン製歯付ベル
トの製造方法に係り、ベルト歯部を補強したポリウレタ
ン製歯付ベルトの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a polyurethane toothed belt, and more particularly to a method for manufacturing a polyurethane toothed belt having reinforced belt teeth.
【０００２】[0002]
【従来の技術】従来の歯付ベルトは、加硫ゴムから成形
されたものや液状ポリウレタン等を原料として形成され
たものが知られている。このうち、ポリウレタン製歯付
ベルトは、耐候性と耐摩耗性に優れているために、屋外
で使用される自転車等の動力伝達装置に装着されてい
る。このポリウレタン製歯付ベルトは、ベルト長手方向
に一定ピッチで歯部と溝部を交互に有し、ピッチライン
上にガラス繊維やアラミド繊維等のロープからなる心線
を背部に埋設した構成からなっている。2. Description of the Related Art Conventional toothed belts are known which are molded from vulcanized rubber or liquid polyurethane. Among them, the polyurethane toothed belt is attached to a power transmission device such as a bicycle used outdoors because of its excellent weather resistance and abrasion resistance. This polyurethane toothed belt has a configuration in which tooth portions and groove portions are alternately arranged at a constant pitch in the belt longitudinal direction, and a core wire made of rope such as glass fiber or aramid fiber is embedded in the back portion on the pitch line. There is.
【０００３】しかし、この歯付ベルトは溝部の歯底面に
補強材が存在しないために、歯底面が摩耗して心線の損
傷が起こりやすくなっていた。具体的には、駆動中にほ
こり、砂等の異物がプーリ歯部表面とベルト歯底面の間
に噛み込み、ベルト歯底面が擦られて摩耗しやすくな
り、心線を露出させていた。その結果、心線は水分を吸
収して強度低下を起こし、ベルトを早期に切断させてい
た。However, since the toothed belt has no reinforcing material on the tooth bottom surface of the groove portion, the tooth bottom surface is worn and the core wire is apt to be damaged. Specifically, during driving, foreign matter such as dust and sand is caught between the surface of the pulley tooth portion and the bottom surface of the belt tooth, and the bottom surface of the belt is easily rubbed and easily worn to expose the core wire. As a result, the core wire absorbs water to cause a decrease in strength, and the belt is cut early.
【０００４】この点を改善するために、荒目の織布をベ
ルト歯底面に沿って配置したポリウレタン製歯付ベルト
が実公昭４６−６４１２号公報に提案され、またエラス
トマー材料を含浸した不織布をベルト歯底面に沿って配
置したポリウレタン製歯付ベルトが実開昭６３−６６６
４８公報に記載されている。In order to improve this point, a polyurethane toothed belt in which a rough woven fabric is arranged along the bottom surface of the belt is proposed in Japanese Utility Model Publication No. 46-6412, and a nonwoven fabric impregnated with an elastomer material is proposed. The polyurethane toothed belt placed along the bottom of the belt is actually opened in 63-666.
48 publication.
【０００５】更に、高負荷伝動の能力をもつベルトとし
て、心線にグレーグフィラメントの引張弾性率が約１．
３×１０6 ｋｇ／ｃｍ2 のアラミド２型コード材料を使
用し、ベルト歯部と歯底面に帆布を被覆したポリウレタ
ン製歯付ベルトが、特公平３−９３３５号公報に開示さ
れている。更に、他のポリウレタン製歯付ベルトとし
て、ベルト歯底面にエラストマー材料を含浸し薄く圧縮
された圧縮不織布を設け、歯部内ではこの圧縮不織布と
連続する不織布が非加圧の拡散状態として分散され、歯
部を補強した構成のものが、特公平５−６２６５７号公
報に開示されている。Furthermore, as a belt having a high load transmission capability, the tensile elastic modulus of the Greg filament is about 1.
Japanese Patent Publication No. 3-9335 discloses a polyurethane toothed belt in which 3 × 10 6 kg / cm 2 of aramid type 2 cord material is used and a belt tooth portion and a tooth bottom are covered with a canvas. Furthermore, as another polyurethane toothed belt, a compressed nonwoven fabric impregnated with an elastomer material is thinly compressed on the tooth bottom surface of the belt, and a nonwoven fabric continuous with this compressed nonwoven fabric is dispersed as a non-pressurized diffused state in the tooth portion, A structure in which the teeth are reinforced is disclosed in Japanese Patent Publication No. 5-62657.
【０００６】[0006]
【発明が解決しようとする課題】しかし、従来のベルト
歯部と歯底面に帆布を被覆したポリウレタン製歯付ベル
トは、帆布がベルト歯部と歯底面を充分に保護している
ために、心線の損傷が小さくて高負荷伝動を可能にして
いる。しかし、このベルトを製造方法する場合、帆布を
予め金型の溝部に沿わせておかないと、帆布が歯部表面
に密着することができなかった。また、特公平５−６２
６５７号公報に開示された伝動ベルトは、歯部全体を補
強しているし、またこのベルトの製造方法では、特開昭
６３−２４６５３２号公報に開示されているように、嵩
高い不織布を心線の巻き付けによって内金型の溝部内に
まんべんなく充満させて、液状ポリウレタンを注型して
いた。However, in the conventional polyurethane toothed belt in which the belt tooth portion and the tooth bottom are covered with the canvas, since the canvas sufficiently protects the belt tooth portion and the tooth bottom, The damage to the wire is small and high load transmission is possible. However, in the case of manufacturing this belt, the canvas cannot be brought into close contact with the tooth surface unless the canvas is previously aligned with the groove of the mold. In addition, Japanese Patent Publication 5-62
The transmission belt disclosed in Japanese Patent No. 657 reinforces the entire tooth portion, and in the manufacturing method of this belt, as disclosed in Japanese Patent Laid-Open No. 63-246532, a bulky nonwoven fabric is used. Liquid polyurethane was cast by filling the groove of the inner mold evenly by winding the wire.
【０００７】しかし、従来の歯付べルトを検討した結
果、歯付べルトでは歯部全体をまんべんなく補強する必
要はなく、歯付べルトがプーリと噛み合う時にべルト歯
部の中でも最も圧縮応力を受けるベルト歯元部とそれを
含む領域を補強すればよいことが明らかになった。本発
明はこのような問題点を改善するものであり、特にべル
ト歯部の中で最も圧縮応力を受けるベルト歯元部とそれ
を含む領域を補強して高負荷伝動を可能にし、しかも製
造の容易なポリウレタン製歯付ベルトの製造方法を提供
することを目的とする。However, as a result of studying the conventional toothed belt, it is not necessary to completely reinforce the entire tooth portion with the toothed belt, and when the toothed belt meshes with the pulley, the most compressive stress among the belt toothed portions is obtained. It has been clarified that it is sufficient to reinforce the root portion of the belt to be received and the area including it. The present invention solves such a problem, in particular, the belt tooth root portion which receives the most compressive stress in the belt tooth portion and the region including the belt tooth portion are reinforced to enable high load transmission, and It is an object of the present invention to provide a method for easily manufacturing a polyurethane toothed belt.
【０００８】[0008]
【課題を解決するための手段】即ち、本発明の特徴は、
溝部を所定の間隔で設けて内金型の外周面に不織布を装
着し、そして心線を巻き付けた後、この内金型を外金型
に挿入して液状ポリウレタンを内金型と外金型の間の空
間部に充満させ、硬化させて得られたベルトで、長さ方
向に沿ってベルト歯部とベルト溝部を交互に形成し、心
線を背部に埋設した形状のポリウレタン製歯付ベルトの
製造方法において、上記不織布として芯部と表面部から
なり、少なくとも表面部の短繊維をバインダー処理せず
に形成し、そして上記表面部の短繊維が液状ポリウレタ
ンの流動中に芯部から分離してベルト歯部の心線に近い
領域に拡散するものを使用するポリエレタン製歯付ベル
トの製造方法にある。That is, the features of the present invention are as follows:
After providing the non-woven fabric on the outer peripheral surface of the inner mold with grooves provided at a predetermined interval, and winding the core wire, insert this inner mold into the outer mold and insert liquid polyurethane into the inner mold and the outer mold. A belt made of polyurethane that is obtained by filling the space between the two parts and curing it, and forming belt teeth and belt grooves alternately along the length direction, and a toothed belt made of polyurethane with the core wire buried in the back. In the method for producing, the nonwoven fabric is composed of a core portion and a surface portion, at least the surface portion short fibers are formed without binder treatment, and the surface portion short fibers are separated from the core portion during the flow of the liquid polyurethane. The present invention relates to a method for manufacturing a polyeretan toothed belt that uses a belt tooth portion that diffuses into a region close to the core wire.
【０００９】また、本発明は、不織布の表面部が芯部に
比べて大きい目付量を有している場合や、不織布の芯部
の目付量が２０〜５０ｇ／ｍ2 で、各表面部の目付量が
５０〜１００ｇ／ｍ2 である場合や、ベルト歯部の心線
に近い領域が、心線からベルト歯部先端に至るまでの高
さをＨとした場合に、心線からＨの２／３付近までの動
力伝達領域である場合も含む。Further, according to the present invention, when the surface area of the non-woven fabric has a larger basis weight than that of the core, or when the basis weight of the non-woven fabric is 20 to 50 g / m 2 , When the basis weight is 50 to 100 g / m 2 , or when the area near the core of the belt teeth is H, the height from the core to the tip of the belt is H. It also includes the case of the power transmission region up to around 2/3.
【００１０】図１は本発明に係る歯付ベルトの製造方法
を示す概略図である。これによると歯付ベルトは以下の
通り製造される。まず、溝部２１を有する内金型２０の
外面に、厚さ１．０〜２．０ｍｍの連続した不織布１１
を配置した後、その上から心線５を巻き付けて不織布１
１を圧縮する。このとき、不織布１１は少し溝部２１へ
入り込む。FIG. 1 is a schematic view showing a method for manufacturing a toothed belt according to the present invention. According to this, the toothed belt is manufactured as follows. First, the continuous nonwoven fabric 11 having a thickness of 1.0 to 2.0 mm is formed on the outer surface of the inner mold 20 having the groove 21.
After arranging, the core wire 5 is wound from above and the nonwoven fabric 1
Compress 1. At this time, the nonwoven fabric 11 slightly enters the groove portion 21.
【００１１】上記心線５としては、パラ系アラミド繊維
（商品名：トワロン、ケブラー、テクノーラ）あるいは
ガラス繊維（Ｅガラス、高強度ガラス）のいずれでもよ
く、その構成、太さ、撚り数等には左右されない。The core wire 5 may be either para-aramid fiber (trade name: Twaron, Kevlar, Technora) or glass fiber (E glass, high-strength glass), depending on its constitution, thickness, number of twists and the like. Is not affected.
【００１２】また、ここで使用する不織布１１は、長さ
５〜６０ｍｍのポリエチレン、ポリプロピレン、ポリア
ミド、ポリエステル、アクリル、ガラス等の繊維を素材
とし、例えばウエブ中の繊維を機械的な作用により絡み
合わせ、交絡させて強力を生じさせるニードルパンチ等
により成形され、バインダー処理をしていない。構成し
ている短繊維１４は分離可能になっている。この不織布
１１は、図２に示すように、芯部２５と表面部２６の２
層から形成され、表面部２６の目付量は、芯部２５のそ
れより大きくなっている。即ち、表面部２６は多くの短
繊維１４を含み、液状ポリウレタンの流動中に芯部２５
から分離拡散しやすくなっている。不織布の芯部２５の
目付量が２０〜５０ｇ／ｍ2で、各表面部２６の目付量
が５０〜１００ｇ／ｍ2 である。The non-woven fabric 11 used here is made of fibers such as polyethylene, polypropylene, polyamide, polyester, acryl and glass having a length of 5 to 60 mm. For example, the fibers in the web are entangled by a mechanical action. , Which is formed by needle punching or the like that is entangled to generate strength, and is not treated with a binder. The constituent short fibers 14 are separable. As shown in FIG. 2, this non-woven fabric 11 has a core portion 25 and a surface portion 26.
The surface weight of the surface portion 26 is larger than that of the core portion 25. That is, the surface part 26 contains many short fibers 14, and the core part 25 is contained during the flow of the liquid polyurethane.
It is easy to separate and diffuse from. The basis weight of the non-woven fabric core portion 25 is 20 to 50 g / m 2 , and the basis weight of each surface portion 26 is 50 to 100 g / m 2 .
【００１３】成形する前の不織布１１の厚みは、ＪＩＳ
Ｌ１０８５に基づいて測定すると１．０〜２．０ｍｍで
ある。不織布１１の厚みが２．０ｍｍを超えると、歯底
面から心線中心位置までのＰＬＤが大きくなり、また不
織布１４の芯部２５から分離し拡散した短繊維１４がベ
ルト歯先部８まで分散し、目的とす領域内での短繊維１
４の分散密度が小さくなって補強効果が小さくなる。一
方、不織布１１の厚みが１．０ｍｍ未満になると、不織
布１１の芯部２５から分散する短繊維１４の量が少なく
なって、目的とする領域を充分に補強できなくなる。芯
部２５と表面部２６の比率については、特に制限はな
い。表面部２６の厚みと目付量は、短繊維１４の分離拡
散する量やその拡散範囲を調節することができる。尚、
芯部２５は短繊維１４を分離拡散する必要がないため、
バインダー処理をしてもよいが、不織布１１が硬くなる
ためにバインダー処理をしないほうが好ましい。The thickness of the non-woven fabric 11 before molding is JIS
It is 1.0 to 2.0 mm when measured based on L1085. When the thickness of the non-woven fabric 11 exceeds 2.0 mm, the PLD from the tooth bottom surface to the center position of the core becomes large, and the short fibers 14 separated from the core portion 25 of the non-woven fabric 14 and diffused are dispersed to the belt tooth tip portion 8. , Short fibers in the target area 1
The dispersion density of No. 4 is small and the reinforcing effect is small. On the other hand, when the thickness of the non-woven fabric 11 is less than 1.0 mm, the amount of the short fibers 14 dispersed from the core portion 25 of the non-woven fabric 11 becomes small, and the target region cannot be reinforced sufficiently. The ratio between the core portion 25 and the surface portion 26 is not particularly limited. The thickness of the surface portion 26 and the basis weight can control the amount of the short fibers 14 to be separated and diffused and the diffusion range thereof. still,
Since the core portion 25 does not need to separate and diffuse the short fibers 14,
Although the binder treatment may be performed, it is preferable not to perform the binder treatment because the nonwoven fabric 11 becomes hard.
【００１４】この内金型２０を予め所定量の液状ポリウ
レタンを注入した外金型２２内に挿入し、金型内を密閉
して減圧して液状ポリウレタン内の気泡を除去した後に
上方へ流動させて不織布１１に浸透させる。このときの
液状ポリウレタンの乱流によって不織布１１の表面部２
６の短繊維１４が芯部２５から分離し所定領域内に拡散
する。尚、液状ポリウレタンを予め外金型に注型してお
く必要はなく、内金型２０を外金型２２に設置した後、
注型してもよい。The inner mold 20 is inserted into an outer mold 22 into which a predetermined amount of liquid polyurethane has been previously injected, and the mold is hermetically closed and decompressed to remove air bubbles in the liquid polyurethane and then flow upward. To penetrate into the non-woven fabric 11. Due to the turbulent flow of the liquid polyurethane at this time, the surface portion 2 of the nonwoven fabric 11
The short fibers 14 of No. 6 are separated from the core portion 25 and diffuse into the predetermined region. In addition, it is not necessary to cast the liquid polyurethane into the outer mold beforehand, and after the inner mold 20 is installed in the outer mold 22,
May be cast.
【００１５】液状ポリウレタンが上昇し終わると、金型
内を開けて空気を入れて加圧し、所定温度で液状ポリウ
レタンを硬化させる。この時に金型温度は８０〜１５０
°Ｃである。硬化後にベルトスリーブを内金型２０から
抜き取り、輪状に切断して歯付ベルトが得られる。When the liquid polyurethane has finished rising, the inside of the mold is opened and air is introduced to apply pressure to cure the liquid polyurethane at a predetermined temperature. At this time, the mold temperature is 80-150
° C. After curing, the belt sleeve is taken out from the inner mold 20 and cut into a ring shape to obtain a toothed belt.
【００１６】図３は本発明の製造方法によって得られた
歯付ベルトの要部断面図であり、図４は図３に示す歯付
ベルトの歯部の拡大図である。本発明の歯付ベルト１
は、ベルト長手方向（図中矢印）に沿って複数の歯部２
と溝部３とを交互に有し、背部４に心線５を埋設してい
る。FIG. 3 is a sectional view of a main part of the toothed belt obtained by the manufacturing method of the present invention, and FIG. 4 is an enlarged view of the tooth part of the toothed belt shown in FIG. Toothed belt 1 of the present invention
Is a plurality of tooth portions 2 along the belt longitudinal direction (arrow in the figure).
And the groove portion 3 are alternately provided, and the core wire 5 is embedded in the back portion 4.
【００１７】上記歯部２は、心線５の外面Ｌからベルト
歯部先端６に至るまでの領域を２つに区分され、心線５
に近い領域がプーリからの大きな圧縮応力を受けて動力
の伝達を担う動力伝達領域７になり、ベルト歯部先端６
に至る領域をベルト歯先部８になる。ベルト歯元部９は
動力伝達領域７の一部となり、最も圧縮応力を受ける箇
所になっている。動力伝達領域７とベルト歯先部８との
境界線Ｂは、心線５の外面Ｌからベルト歯部先端６に至
るまでの高さをＨとした場合に、心線５の外面ＬからＨ
の２／３付近、好ましくは１／２付近にある。The tooth portion 2 is divided into two regions from the outer surface L of the core wire 5 to the tip 6 of the belt tooth portion.
Is a power transmission region 7 that receives a large compressive stress from the pulley to transmit power, and the belt tooth tip 6
The area leading up to is the belt tooth tip 8. The belt tooth root portion 9 becomes a part of the power transmission region 7 and is the portion that receives the most compressive stress. A boundary line B between the power transmission area 7 and the belt tooth tip 8 is H from the outer surface L of the core wire 5 to H when the height from the outer surface L of the core wire 5 to the tip 6 of the belt tooth portion is H.
Is about 2/3, preferably about 1/2.
【００１８】エラストマー材料を含浸した不織布１１
は、溝部の歯底面１２と動力伝達領域７内に連続して配
置されている。動力伝達領域７内の不織布１１は、歯底
面１２のそれよりやや薄くなって心線５から垂れ下がっ
た状態になり、動力伝達領域７を補強している。更に、
上記動力伝達領域７内では、短繊維１４が不織布１１か
ら分離して拡散し、動力伝達領域７の補強を助長してい
る。ベルト歯元部９では、他の動力伝達領域７に比べる
と不織布１１および短繊維１４の添加量を多くして、補
強強化を向上させている。また、短繊維１４の分散状態
は、均一あるいは不均一でもよい。Nonwoven fabric 11 impregnated with elastomer material
Are continuously arranged in the power transmission area 7 with the tooth bottom surface 12 of the groove portion. The non-woven fabric 11 in the power transmission region 7 becomes slightly thinner than that of the tooth bottom surface 12 and hangs down from the core wire 5, thus reinforcing the power transmission region 7. Furthermore,
In the power transmission region 7, the short fibers 14 are separated from the non-woven fabric 11 and diffused to promote the reinforcement of the power transmission region 7. In the belt root portion 9, the non-woven fabric 11 and the short fibers 14 are added in a larger amount than in the other power transmission regions 7 to improve the reinforcement and reinforcement. Moreover, the dispersion state of the short fibers 14 may be uniform or non-uniform.
【００１９】短繊維１４を不均一に分散させた実施例が
図５に示される。この歯付ベルト１では、短繊維１４の
分散密度がベルト歯元部９付近で最も高くなり、ベルト
歯元部９を局部的に補強して亀裂発生を阻止している。
この場合、動力伝達領域７とベルト歯先部８との境界線
Ｂは、心線５の外面ＬからＨの１／２付近にある。An example in which the short fibers 14 are non-uniformly dispersed is shown in FIG. In this toothed belt 1, the dispersion density of the short fibers 14 is highest near the belt root portion 9, and the belt root portion 9 is locally reinforced to prevent cracking.
In this case, the boundary line B between the power transmission region 7 and the belt tooth tip 8 is near ½ of the outer surface L to H of the core wire 5.
【００２０】この発明の製造方法で得られた歯付ベルト
１は、べルト歯部２の中で最も圧縮応力を受けるベルト
歯元部９とこれを含む動力伝達領域７を補強して、ベル
ト歯元部９の亀裂発生とその伝播を阻止することができ
る。即ち、図６に示すように、ベルト歯部２において心
線５の位置からベルト歯部先端６に至るまでの領域は、
力学的にベルト歯部２の高さ方向に２つに分割される。
心線５に近い動力伝達領域７は、図中矢印方向へ回転し
ているプーリ１７からベルト歯元部９付近で大きな圧縮
応力Ｆを受け、ベルト歯先部８に向かって序々に小さな
圧縮応力を受けている。ベルト歯元部９は図に示すよう
に大きな圧縮歪みを受けている。The toothed belt 1 obtained by the manufacturing method of the present invention has a belt tooth root portion 9 which receives the most compressive stress in the belt tooth portion 2 and a power transmission region 7 including the belt tooth root portion 9 which are reinforced to reinforce the belt. It is possible to prevent the occurrence of cracks in the tooth root portion 9 and their propagation. That is, as shown in FIG. 6, the area of the belt tooth portion 2 from the position of the core wire 5 to the tip 6 of the belt tooth portion is
It is dynamically divided into two in the height direction of the belt tooth portion 2.
The power transmission region 7 near the core wire 5 receives a large compressive stress F near the belt root 9 from the pulley 17 rotating in the direction of the arrow in the figure, and gradually decreases toward the belt tip 8. Is receiving. The belt root portion 9 is subjected to a large compressive strain as shown in the figure.
【００２１】この動力伝達領域７とベルト歯先部８の境
界線Ｂは、心線５の下面Ｌからベルト歯部先端６に至る
までの高さをＨとした場合に、心線５の下面ＬからＨの
約２／３付近にある。この動力伝達領域７に不織布１１
を配置するとともに、この不織布１１から分離拡散した
短繊維１４をこの領域７内のみに存在させることで、集
中的に動力伝達領域７を補強することができる。ベルト
歯先部８は、圧縮応力を受けているが、補強材となる短
繊維１４を存在させる必要がなく、エラストマー材料で
充分である。また、動力伝達領域７内で拡散した短繊維
１４の分散密度をベルト歯元部９付近で最も高くするこ
とで、ベルト歯元部９をさらに補強して亀裂発生を阻止
することができる。The boundary line B between the power transmission area 7 and the belt tooth tip 8 is the lower surface of the core wire 5 when the height from the lower surface L of the core wire 5 to the belt tooth tip 6 is H. It is around 2/3 of L to H. The non-woven fabric 11 is provided in the power transmission area 7.
And the short fibers 14 separated and diffused from the non-woven fabric 11 are present only in this region 7, the power transmission region 7 can be reinforced intensively. Although the tooth tip portion 8 of the belt is subjected to compressive stress, it is not necessary to allow the short fiber 14 serving as a reinforcing material to exist, and an elastomer material is sufficient. Further, by making the dispersion density of the short fibers 14 diffused in the power transmission region 7 the highest in the vicinity of the belt root portion 9, it is possible to further reinforce the belt root portion 9 and prevent the occurrence of cracks.
【００２２】[0022]
【作用】本発明の製造方法では、芯部２５と表面部２６
をもつ不織布１１を使用し、成形時の液状ポリウレタン
の流動中に不織布１１の表面部２６の短繊維１４を芯部
２５から分離拡散させることで、べルト歯部２の中で最
も圧縮応力を受けるベルト歯元部９とこれを含む動力伝
達領域７を補強する。しかも、芯部２５も動力伝達領域
７に残存するため、動力伝達領域７を補強する。In the manufacturing method of the present invention, the core portion 25 and the surface portion 26 are
By using the non-woven fabric 11 having the above, and separating and diffusing the short fibers 14 of the surface part 26 of the non-woven fabric 11 from the core part 25 during the flow of the liquid polyurethane at the time of molding, the most compressive stress in the belt tooth part 2 is obtained. The belt tooth root portion 9 to be received and the power transmission region 7 including this are reinforced. Moreover, since the core portion 25 also remains in the power transmission area 7, the power transmission area 7 is reinforced.
【００２３】[0023]
【実施例】以下、本発明を実施例にて詳細に説明する。 実施例１ 芯部の目付量３０ｇ／ｍ2 、各表面部の目付量７０ｇ／
ｍ2 、厚さ１．３ｍｍで、ニードルパンチにより成形さ
れ、バインダー処理がされていない６．６ナイロン繊維
からなる筒状の不織布を、溝部を有する内金型の外面に
装着した。次に、この上に、アラミド繊維（商品名：ト
ワロン：エンカ社製）１，０９０デニール／５本（５，
４５０デニール）を引き揃え、Ｓ方向に１１回／１０ｃ
ｍ、Ｚ方向に２５回／１０ｃｍの割合で撚られたＳ、Ｚ
一対の撚りコードとし、この撚りコードをスピニングし
た。心線占有率は９０．０〜９４．２％である。EXAMPLES The present invention will be described in detail below with reference to examples. Example 1 A basis weight of the core portion was 30 g / m 2 , and a basis weight of each surface portion was 70 g / m 2 .
m 2, a thickness of 1.3 mm, is formed by needle punching, the tubular nonwoven fabric made of 6.6 nylon fibers that are not binder treatment was attached to the outer surface of the inner die having a groove. Next, on this, aramid fiber (trade name: Twaron: manufactured by Enca) 1,090 denier / 5 fibers (5,
Align 450 denier, 11 times in S direction / 10c
S and Z twisted 25 times / 10 cm in the m and Z directions
A pair of twisted cords was made, and this twisted cord was spun. The core wire occupancy rate is 90.0 to 94.2%.
【００２４】上記内金型を予め所定量の液状ポリウレタ
ン原料（プレポリマー１００重量部、３，３' −ジシク
ロ４，４アミノジフェニルメタンである硬化剤で２０重
量部、可塑剤２０重量部、着色剤０．５重量部）を注型
した外金型内に挿入して、金型内を密閉して減圧し液状
ポリウレタンを上昇させて不織布内に浸透させた。液状
ポリウレタンが上昇し終わると、金型内を開けて空気を
入れて加圧し、金型温度１１０°Ｃで液状ポリウレタン
を硬化させた。ポリウレタンの硬度は９２°（ＪＩＳ−
Ａ）であった。硬化後にベルトスリーブを内金型から抜
き取り、輪状に切断して歯付ベルトを得た。得られたベ
ルトサイズは、ベルトの歯型：Ｓ８Ｍ（ＳＴＰＤ）、歯
数：１５６、ベルト幅：１２ｍｍ、歯ピッチ：８ｍｍで
あった。ベルトは、図４に示すように、エラストマー材
料を含浸した不織布が溝部の歯底面と動力伝達領域内に
連続して配置され、動力伝達領域内に位置する不織布の
芯部から拡散した表面部の短繊維が該動力伝達領域内の
みに存在していた。[0024] The inner mold in advance predetermined amount of liquid polyurethane material (100 parts by weight of the prepolymer, 3,3 '- 20 parts by weight curing agent is dicyclohexyl 4,4-diaminodiphenylmethane, plasticizer 20 parts by weight, the colorant 0.5 part by weight) was inserted into the cast outer mold, and the mold was hermetically closed and decompressed to raise the liquid polyurethane to penetrate into the nonwoven fabric. When the liquid polyurethane had finished rising, the inside of the mold was opened, air was introduced and pressure was applied, and the liquid polyurethane was cured at a mold temperature of 110 ° C. The hardness of polyurethane is 92 ° (JIS-
It was A). After curing, the belt sleeve was taken out from the inner mold and cut into a ring shape to obtain a toothed belt. The obtained belt size was belt tooth type: S8M (STPD), number of teeth: 156, belt width: 12 mm, tooth pitch: 8 mm. In the belt, as shown in FIG. 4, a non-woven fabric impregnated with an elastomer material is continuously arranged in the tooth bottom surface of the groove portion in the power transmission region, and the surface portion diffused from the core portion of the non-woven fabric located in the power transmission region. Short fibers were present only in the power transmission area.
【００２５】次に、このベルトを２軸走行試験機に取り
付けて走行させ、耐久試験を行った。この走行試験は、
ベルトを駆動プーリ（歯数３６）と従動プーリ（歯数３
６）に巻き付け、室温の雰囲気環境温度で駆動プーリの
回転数１，２００ｒｐｍ、負荷４．８ｋｗ、ベルト初張
力４８ｋｇで走行させた。その結果、ベルトは７８８時
間で歯欠けを起こした。尚、比較例１として、実施例１
と同様の方法で作製した不織布を使用しない歯付ベルト
を用いた場合には、１７時間で切断した。また、比較例
２として、不織布の代わりに、厚さ０．４ｍｍの６ナイ
ロン繊維からなる織布を用いて、実施例１と同様の方法
で作製した歯付ベルトは１６２時間で歯欠けを起こし
た。Next, this belt was mounted on a biaxial running tester and run, and a durability test was conducted. This running test
Drive belt (36 teeth) and driven pulley (3 teeth)
It was wound around 6) and run at an ambient environmental temperature of room temperature with a drive pulley rotation speed of 1,200 rpm, a load of 4.8 kw, and a belt initial tension of 48 kg. As a result, the belt was chipped at 788 hours. As Comparative Example 1, Example 1
When a non-woven fabric-made toothed belt manufactured by the same method as in (1) was used, the cutting was performed in 17 hours. Further, as Comparative Example 2, a toothed belt produced in the same manner as in Example 1 except that a woven cloth made of 6 nylon fiber having a thickness of 0.4 mm was used instead of the non-woven cloth, caused tooth loss in 162 hours. It was
【００２６】[0026]
【発明の効果】以上のように、本発明の製造方法では、
芯部と表面部をもつ不織布を使用し、成形時の液状ポリ
ウレタンの流動中に不織布の表面部の短繊維を芯部から
分離拡散させべルト歯部の中で最も圧縮応力を受けるベ
ルト歯元部とこれを含む動力伝達領域に分散させること
ができるとともに、芯部も動力伝達領域に残存させるこ
とによって、べルト歯部の中で最も圧縮応力を受けるベ
ルト歯元部とこれを含む動力伝達領域を補強することが
でき、耐久性に優れ、高負荷伝動を可能にする歯付ベル
トを得ることができる。また、従来のようにベルト歯部
全体を補強する場合に比べて、ベルト歯先部に補強材と
なる短繊維を存在させる必要がないために、使用する不
織布を減量することができ、また製造も容易である。As described above, according to the manufacturing method of the present invention,
A belt root that uses a non-woven fabric that has a core and a surface and receives the most compressive stress among the belt teeth by separating and diffusing the short fibers on the surface of the non-woven fabric from the core during the flow of liquid polyurethane during molding. Of the belt tooth root portion that receives the most compressive stress among the belt tooth portions and the power transmission portion including the belt portion and the power transmission area including the core portion by allowing the core portion to remain in the power transmission area. It is possible to obtain a toothed belt that can reinforce the region, has excellent durability, and enables high load transmission. Further, as compared with the conventional case where the entire belt tooth portion is reinforced, it is not necessary to allow the staple fibers serving as a reinforcing material to exist at the tooth tip portion of the belt. Is also easy.
【図１】本発明に係る歯付ベルトの製造方法を説明する
概略図である。FIG. 1 is a schematic view illustrating a method for manufacturing a toothed belt according to the present invention.
【図２】本発明の製造方法に使用する不織布の側面図で
ある。FIG. 2 is a side view of a nonwoven fabric used in the manufacturing method of the present invention.
【図３】本発明の製造方法によって得られた歯付ベルト
の側面図である。FIG. 3 is a side view of the toothed belt obtained by the manufacturing method of the present invention.
【図４】図３に示す歯付ベルトの歯部拡大図である。FIG. 4 is an enlarged view of a tooth portion of the toothed belt shown in FIG.
【図５】本発明に係る他の歯付ベルトの歯部拡大図であ
る。FIG. 5 is an enlarged view of a tooth portion of another toothed belt according to the present invention.
【図６】本発明に係る歯付ベルトとプーリとが噛み合っ
ている状態を示す図である。FIG. 6 is a diagram showing a state in which a toothed belt according to the present invention and a pulley are in mesh with each other.
１ 歯付ベルト ２ 歯部 ３ 溝部 ４ 背部 ５ 心線 ６ ベルト歯部先端 ７ 動力伝達領域 ８ ベルト歯先部 ９ ベルト歯元部 １１ 不織布 １２ 歯底面 １４ 短繊維 ２０ 内金型 ２１ 溝部 ２２ 外金型 ２５ 芯部 ２６ 表面部 1 Toothed Belt 2 Tooth Part 3 Groove Part 4 Back Part 5 Core Wire 6 Belt Tooth Part Tip 7 Power Transmission Area 8 Belt Tooth Tip Part 9 Belt Tooth Root Part 11 Nonwoven Fabric 12 Teeth Bottom Surface 14 Short Fiber 20 Inner Mold 21 Groove Part 22 Foreign Metal Mold 25 Core 26 Surface
Claims (4)
面に不織布を装着し、そして心線を巻き付けた後、この
内金型を外金型に挿入して液状ポリウレタンを内金型と
外金型の間の空間部に充満させ、硬化させて得られたベ
ルトで、長さ方向に沿ってベルト歯部とベルト溝部を交
互に形成し、心線を背部に埋設した形状のポリウレタン
製歯付ベルトの製造方法において、上記不織布として芯
部と表面部からなり、少なくとも表面部の短繊維をバイ
ンダー処理せずに形成し、そして上記表面部の短繊維が
液状ポリウレタンの流動中に芯部から分離してベルト歯
部の心線に近い領域に拡散するものを使用することを特
徴とするポリウレタン製歯付ベルトの製造方法。1. A groove is provided at a predetermined interval, a non-woven fabric is attached to an outer peripheral surface of an inner mold, and after a core wire is wound, the inner mold is inserted into an outer mold so that liquid polyurethane is contained in the inner mold. A belt obtained by filling the space between the mold and the outer mold and curing it, forming belt teeth and belt grooves alternately along the length direction, with a core wire embedded in the back. In the method for producing a polyurethane toothed belt, the nonwoven fabric comprises a core portion and a surface portion, at least the surface portion short fibers are formed without binder treatment, and the surface portion short fibers are formed during the flow of the liquid polyurethane. A method for manufacturing a polyurethane toothed belt, characterized in that a polyurethane toothed belt is used which is separated from a core portion and diffused into a region near a core of a belt tooth portion.
付量を有している請求項１記載のポリウレタン製歯付ベ
ルトの製造方法。2. The method for producing a polyurethane toothed belt according to claim 1, wherein the surface portion of the non-woven fabric has a larger basis weight than the core portion.
ｍ2 で、各表面部の目付量が５０〜１００ｇ／ｍ2 であ
る請求項２記載のポリウレタン製歯付ベルトの製造方
法。3. The basis weight of the non-woven fabric core is 20 to 50 g /
m 2, and the method for producing a polyurethane toothed belt according to claim 2, wherein the weight per unit area of the surface portion is 50 to 100 g / m 2.
らベルト歯部先端に至るまでの高さをＨとした場合に、
心線からＨの２／３付近までの動力伝達領域である請求
項１記載のポリウレタン製歯付ベルトの製造方法。4. When the height of the region near the core of the belt tooth portion from the core to the tip of the belt tooth portion is H,
The method for manufacturing a polyurethane toothed belt according to claim 1, wherein the power transmission region is from the core wire to about 2/3 of H.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5340652A JP2651792B2 (en) | 1993-12-07 | 1993-12-07 | Method for producing polyurethane toothed belt |
| US08/349,821 US5536214A (en) | 1993-12-07 | 1994-12-06 | Power transmission belt and method of manufacturing the same |
| DE4443597A DE4443597A1 (en) | 1993-12-07 | 1994-12-07 | Toothed drive transmission belt |
| US08/602,105 US5741197A (en) | 1993-12-07 | 1996-02-22 | Power transmission belt and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5340652A JP2651792B2 (en) | 1993-12-07 | 1993-12-07 | Method for producing polyurethane toothed belt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07156288A true JPH07156288A (en) | 1995-06-20 |
| JP2651792B2 JP2651792B2 (en) | 1997-09-10 |
Family
ID=18339026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5340652A Expired - Fee Related JP2651792B2 (en) | 1993-12-07 | 1993-12-07 | Method for producing polyurethane toothed belt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2651792B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011148263A1 (en) | 2010-05-26 | 2011-12-01 | Toyota Jidosha Kabushiki Kaisha | Toothed belt and method of manufacturing the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03265739A (en) * | 1990-03-15 | 1991-11-26 | Bando Chem Ind Ltd | Timing belt |
| JPH0562657A (en) * | 1991-09-04 | 1993-03-12 | Matsushita Electric Ind Co Ltd | Lead-acid storage battery |
-
1993
- 1993-12-07 JP JP5340652A patent/JP2651792B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03265739A (en) * | 1990-03-15 | 1991-11-26 | Bando Chem Ind Ltd | Timing belt |
| JPH0562657A (en) * | 1991-09-04 | 1993-03-12 | Matsushita Electric Ind Co Ltd | Lead-acid storage battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011148263A1 (en) | 2010-05-26 | 2011-12-01 | Toyota Jidosha Kabushiki Kaisha | Toothed belt and method of manufacturing the same |
| US8979690B2 (en) | 2010-05-26 | 2015-03-17 | Toyota Jidosha Kabushiki Kaisha | Toothed belt and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2651792B2 (en) | 1997-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5741197A (en) | Power transmission belt and method of manufacturing the same | |
| US3535946A (en) | Positive drive belt | |
| DK160444B (en) | PROCEDURE FOR MANUFACTURING A COMPOUND VEIL BELT | |
| JP3441987B2 (en) | Toothed belt | |
| JPH0562657B2 (en) | ||
| KR100916625B1 (en) | Banded power transmission v-belt | |
| JP2002227937A (en) | Power transmission belt | |
| JP3007371B2 (en) | Fiber reinforced rubber products | |
| US3584516A (en) | Endless belts reinforced with braided strands | |
| JP2622809B2 (en) | Toothed belt | |
| US3855870A (en) | Power transmission belt, reinforcement and process | |
| JP2651792B2 (en) | Method for producing polyurethane toothed belt | |
| JPH02245542A (en) | Trapezoidal power transmission belt | |
| JP2876191B2 (en) | Diamond wire saw | |
| EP0458128B1 (en) | Fiber-reinforced rubber | |
| JP2007092993A (en) | Polyurethane synchronous belt and its manufacturing method | |
| JP2006502349A (en) | Low modulus belt | |
| JP4214105B2 (en) | Toothed belt and manufacturing method thereof | |
| JPS5834697B2 (en) | Multi-rib belt and its manufacturing method | |
| JP2000002302A (en) | Power transmission belt | |
| JPH02101149U (en) | ||
| JPS59217034A (en) | Transmission wrapped cog belt and method of manufacturing the belt | |
| JPS58170946A (en) | Toothed belt and manufacturing method thereof | |
| JPH0911357A (en) | Elastomer toothed belt | |
| JP2004211755A (en) | Cogged v belt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090523 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090523 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100523 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100523 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110523 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120523 Year of fee payment: 15 |
|
| LAPS | Cancellation because of no payment of annual fees |