JP2006038100A - Endless belt with improved durability of inner surface layer along side edge - Google Patents

Endless belt with improved durability of inner surface layer along side edge Download PDF

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JP2006038100A
JP2006038100A JP2004218997A JP2004218997A JP2006038100A JP 2006038100 A JP2006038100 A JP 2006038100A JP 2004218997 A JP2004218997 A JP 2004218997A JP 2004218997 A JP2004218997 A JP 2004218997A JP 2006038100 A JP2006038100 A JP 2006038100A
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endless belt
side edge
layer
innermost
pair
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Shinichi Baba
伸一 馬場
Takehito Hattori
勇仁 服部
Daisuke Kobayashi
大介 小林
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To increase durability of an endless belt of a belt type continuously variable transmission. <P>SOLUTION: This endless belt comprises a pair of endless belt members comprising a combination of a plurality of endless belt layers, and a number of plate-shaped pawl members comprising a neck part and a pair of shoulder parts extended on both sides, with dents formed at border parts between the neck part and the shoulder parts to be engaged with the endless belt members by the shoulder parts. It is to be wrapped around between pulleys in a continuously variable transmission. A measure is provided to improve durability of an inner surface layer in a side edge range of the innermost layer of the endless belt layers on the closer side to the neck part of the pawl member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、複数の無端ベルト層の重合体よりなる無端ベルト部材と、肩部にて前記無端ベルト部材と係合するよう構成された多数の板状の駒部材とを備え、中心軸線に沿って互いに対向する円錐状のベルト係合面を呈する一対のプーリ半体よりなる複数のプーリの間に掛け渡される無段変速装置用の無端ベルトに係り、特にそのような無端ベルトの側縁帯域の局部曲げに対する耐久性を向上し、無端ベルトの寿命の延長を図ることに係る。   The present invention comprises an endless belt member made of a polymer of a plurality of endless belt layers, and a large number of plate-shaped piece members configured to engage with the endless belt member at shoulders, along a central axis. In particular, it relates to an endless belt for a continuously variable transmission, which is spanned between a plurality of pulleys comprising a pair of pulley halves having conical belt engaging surfaces facing each other. This relates to improving durability against local bending and extending the life of the endless belt.

上記の如き構成のベルト式無段変速装置は、それが掛け渡された複数のプーリの各々に於ける一対のプーリ半体間の幅を互いに相反的に変更することにより、それら複数のプーリの間に伝達される回転動力の各プーリに於ける回転速度を相対的に無段階に変更することができるので、車輌用変速装置の一つの好ましい形態として注目されている。   The belt-type continuously variable transmission configured as described above has a plurality of pulleys each having a plurality of pulleys on which the plurality of pulleys on which the belt-type continuously variable transmission is reciprocally changed by changing the width between the pulley halves. Since the rotational speed of each pulley of rotational power transmitted between the pulleys can be relatively steplessly changed, it has been attracting attention as one preferred form of a vehicle transmission.

上記の如き無端ベルトに於いては、無端ベルト部材はプーリの周りを回る度に繰り返し曲げられるが、曲げ応力は曲げ半径をρ、ベルトの厚みをt、ベルト材の弾性係数をEとすると、ベルトの最外部でE・t/2ρであることに鑑み、ベルトの内側部の一部をベルトの両側縁部或いはその間の中間部にてベルトの無端延在方向に沿って溝型に切除することによりベルトの曲げ中立面をベルトの外周側へ遷移させ、それに応じてρを増大させることによりE・t/2ρの値の低減を図ることが下記の特許文献1に記載されている。
実開昭57-68947
In the endless belt as described above, the endless belt member is repeatedly bent every time it rotates around the pulley. The bending stress is expressed as follows: bending radius is ρ, belt thickness is t, and elastic modulus of the belt material is E. Considering that E · t / 2ρ at the outermost part of the belt, a part of the inner part of the belt is cut into a groove shape along the endless extension direction of the belt at both side edges of the belt or an intermediate part therebetween. The following Patent Document 1 describes that the value of E · t / 2ρ is reduced by shifting the belt neutral plane of the belt to the outer peripheral side of the belt and increasing ρ accordingly.
Shokai 57-68947

また、上記の如き無段変速装置用無端ベルトであって、無端ベルトが複数の無端金属帯の重合体よりなる場合に、無端金属帯間の摩擦による損傷を防ぐべく無端金属帯間に潤滑油を含ませておくことに関し、潤滑油が無端金属帯間によりよく保持されるよう無端金属帯の表面に小さな窪みを形成しておくという従来公知の技術の実行上の困難性に鑑み、各無端金属帯をその中央部にて両側縁部より厚い横断面を有する形状とし、かかる無端金属帯の重ね合わせにより無端金属帯間に潤滑油を保持する楔状空隙を形成させることが下記の特許文献2に記載されている。
実開昭58−1486
Further, when the endless belt for a continuously variable transmission as described above is made of a polymer of a plurality of endless metal bands, a lubricating oil is provided between the endless metal bands to prevent damage due to friction between the endless metal bands. In view of the difficulty in carrying out the conventionally known technique of forming a small depression on the surface of the endless metal band so that the lubricating oil is better retained between the endless metal bands, each endless The following Patent Document 2 discloses that the metal strip has a shape having a cross section thicker than both side edges at the center, and a wedge-shaped gap for holding lubricating oil is formed between the endless metal strips by overlapping the endless metal strips. It is described in.
Shokai 58-1486

また、上記の如き無段変速装置用無端ベルトに於いては、肩部に対しベルトが横ずれすることなく正しく整合することを助けるため、駒部材の肩部を僅かに中高に形成しておくことが知られているが、無端ベルトが複数の無端ベルト層の重合体よりなるときには、肩部の中高によるベルト整合効果が外側部の無端ベルト層まで十分に及ばないことに鑑み、無端ベルト重合層を構成する各無端ベルト層の両側縁部の厚みを減らし、無端ベルト層の横断面形状を中高断面形状にしておくことが下記の特許文献3および4に記載されている。
特開昭61−290257 実開昭61−162637
Further, in the endless belt for continuously variable transmission as described above, the shoulder portion of the piece member is formed to be slightly middle and high in order to help the belt to be correctly aligned with the shoulder portion without causing lateral displacement. However, when the endless belt is made of a polymer of a plurality of endless belt layers, in view of the fact that the belt alignment effect due to the middle height of the shoulder does not sufficiently reach the endless belt layer of the outer portion, the endless belt polymerization layer Patent Documents 3 and 4 below describe that the thickness of both end portions of each endless belt layer constituting the endless belt layer is reduced and the cross-sectional shape of the endless belt layer is set to a medium-high cross-sectional shape.
JP 61-290257 Shokai 61-162637

上記特許文献1〜4に於ける如く無端ベルト部材の両側縁部が削られると、無端ベルト部材が駒部材を介してプーリ上に着座するとき無端ベルト部材に掛かる張力により無端ベルト部材はその両側縁部に沿って曲げられ、不用な曲げ応力を受けることになる。また、平らな無端ベルトを円筒状プーリの周りに掛け渡したベルト式伝動装置の基本構成に於いては、プーリに対するベルトの横ずれを抑えるため、プーリの円筒状外周面を僅かに中高の所謂ビール樽形状とすることが古くから知られており、同じ作動原理から、無端ベルト部材と、肩部にて前記無端ベルト部材と係合するよう構成された多数の板状の駒部材とを備え、中心軸線に沿って互いに対向する円錐状のベルト係合面を呈する一対のプーリ半体よりなる複数のプーリの間に掛け渡される無段変速装置用の無端ベルトに於いても、肩部に対するベルトの横ずれを抑えるべく駒部材の肩部を僅かに中高に形成しておくことが古くから知られている。しかし、かかる駒部材肩部の中高構成、或はこれに上記特許文献3または4に記載の如き重合層型無端ベルト部材の各無端ベルト層の両側縁部の厚みを減らし、無端ベルト層の横断面形状を中高とする構成を加えても、無段変速装置の作動中常に無端ベルト部材を駒部材の肩部に対し高精度に整合した状態に維持することは困難であり、実機に於いては、肩部に対する無端ベルト部材の多少の横ずれを見込んで諸寸法の設計がなされる。   When both side edges of the endless belt member are shaved as in Patent Documents 1 to 4, when the endless belt member is seated on the pulley via the piece member, the endless belt member is moved to both sides by the tension applied to the endless belt member. It is bent along the edge and is subjected to unnecessary bending stress. Further, in the basic configuration of the belt-type transmission device in which a flat endless belt is wound around a cylindrical pulley, in order to suppress the lateral displacement of the belt with respect to the pulley, the cylindrical outer peripheral surface of the pulley is a so-called beer with a slightly middle height. It has been known for a long time to have a barrel shape, and from the same operating principle, includes an endless belt member and a plurality of plate-shaped piece members configured to engage with the endless belt member at a shoulder portion, Even in an endless belt for a continuously variable transmission that is stretched between a plurality of pulleys comprising a pair of pulley halves having conical belt engaging surfaces facing each other along a central axis, the belt against the shoulder portion It has been known for a long time to form the shoulder portion of the piece member slightly in the middle and high so as to suppress the lateral displacement of the piece. However, it is possible to reduce the thickness of both side edges of each endless belt layer of the polymer layer type endless belt member as described in Patent Document 3 or 4 above, and to cross the endless belt layer. Even if a configuration with a medium-high surface shape is added, it is difficult to keep the endless belt member aligned with the shoulder of the piece member with high precision at all times during the operation of the continuously variable transmission. The design of various dimensions is made in consideration of some lateral deviation of the endless belt member with respect to the shoulder.

一方、この種の無端ベルトに於ける駒部材は、通常、首部と肩部とを一体に有するよう鋼板から打ち抜かれた物品として造られており、首部と肩部の間の境界部には鋼板打抜きに当って強度を確保すべく、首部から肩部への滑らかな遷移を図る湾曲した窪みが形成されている。無端ベルト部材は、設計上無端ベルトに許される横幅寸法の範囲内にてできるだけ高い駆動荷重を担持することができるよう、できるだけ大きい横幅寸法を有するように設計されるので、首部と肩部の間の境界部に上記の湾曲した窪みが形成されれば、無端ベルト部材が肩部に対し横ずれすることによりその側縁部が肩部の側縁より上記の窪み上に突き出る可能性はそれだけ大きくなり、また現に多くの実機に於いてそれが生じていることが観察される。   On the other hand, the piece member in the endless belt of this type is usually manufactured as an article punched from a steel plate so as to integrally have a neck portion and a shoulder portion, and a steel plate is provided at a boundary portion between the neck portion and the shoulder portion. In order to ensure the strength when punching, a curved recess is formed for a smooth transition from the neck to the shoulder. The endless belt member is designed to have as large a width dimension as possible so that it can carry as high a driving load as possible within the width dimension allowed for the endless belt by design. If the curved recess is formed at the boundary of the shoulder, the endless belt member is displaced laterally with respect to the shoulder, so that the possibility that the side edge protrudes above the recess from the side edge of the shoulder increases. In fact, it is observed that it occurs in many actual machines.

しかし、かかる肩部側縁からの無端ベルト部材側縁の突出しが生ずると、無端ベルト部材が特に複数の無端ベルト層の重合体よりなる場合、複数の無端ベルト層のうちの最内層の側縁部であって肩部により支持されない側縁帯域に於ける内面表層に繰返し応力の作用による強度低下が起こりやすいことが分かった。   However, when the endless belt member side edge protrudes from the shoulder side edge, particularly when the endless belt member is made of a polymer of a plurality of endless belt layers, the side edge of the innermost layer of the plurality of endless belt layers It was found that the strength of the inner surface layer in the side edge zone that is not supported by the shoulder portion tends to decrease due to repeated stress.

本発明は、上記の認識と知見に基づき、この種の無段変速装置用無端ベルトの耐久性を効果的に高めることを課題としている。   An object of the present invention is to effectively enhance the durability of this type of endless belt for continuously variable transmission based on the above recognition and knowledge.

上記の課題を解決するものとして、本発明は、複数の無端ベルト層の重合体よりなる一対の無端ベルト部材と、中央の首部とその両側に延在する一対の肩部とを有し、前記首部と前記肩部の間の境界部には窪みが形成されており、該一対の肩部の各々にて前記一対の無端ベルト部材の各々と係合するよう構成された多数の板状の駒部材とを備え、中心軸線に沿って互いに対向する円錐状のベルト係合面を呈する一対のプーリ半体よりなる複数のプーリの間に掛け渡される無段変速装置用の無端ベルトにして、前記複数の無端ベルト層のうちの最内層の側縁帯域であって前記駒部材の首部に近い側のみの側縁帯域に局部曲げに対する内面表層の耐久性を向上させる措置が施されていることを特徴とする無端ベルトを提案するものである。   In order to solve the above problems, the present invention has a pair of endless belt members made of a polymer of a plurality of endless belt layers, a central neck portion, and a pair of shoulder portions extending on both sides thereof, A plurality of plate-shaped pieces each having a depression formed at a boundary portion between the neck portion and the shoulder portion and configured to engage with each of the pair of endless belt members at each of the pair of shoulder portions. An endless belt for a continuously variable transmission that is spanned between a plurality of pulleys comprising a pair of pulley halves exhibiting conical belt engaging surfaces facing each other along a central axis. A measure for improving the durability of the inner surface layer against local bending is applied to the side edge band of the innermost layer of the plurality of endless belt layers and only the side edge band close to the neck of the piece member. A featureless endless belt is proposed.

前記最内無端ベルト層の前記側縁帯域の内面表層の局部曲げに対する耐久性を向上させる措置は、前記側縁帯域の内面表層を切除することであってよい。   The measure for improving the durability against local bending of the inner surface layer of the side edge zone of the innermost endless belt layer may be to cut the inner surface layer of the side edge zone.

或はまた、前記最内無端ベルト層の前記側縁帯域の内面表層の局部曲げに対する耐久性を向上させる措置は、前記最内無端ベルト層の前記側縁帯域に対しそれより外側にある無端ベルト層から及ぼされる前記局部曲げによる曲げ荷重を低減することであってよい。   Alternatively, the measure for improving the durability against local bending of the inner surface layer of the side edge zone of the innermost endless belt layer is an endless belt located outside the side edge zone of the innermost endless belt layer. It may be to reduce the bending load due to said local bending exerted from the layer.

前記最内無端ベルト層の前記側縁帯域に対しそれより外側にある無端ベルト層から及ぼされる前記局部曲げによる曲げ荷重を低減することは、前記複数の無端ベルト層のうちの前記最内無端ベルト層の上に重なる少なくとも一つの無端ベルト層に於いて前記最内無端ベルト層の前記側縁帯域上に重なる側縁帯域の厚みを低減することであってよい。この場合、前記側縁帯域の厚みの低減はその低減代が該側縁帯域の内側から外側へ向けて次第に増大する態様になされてよい。   Reducing the bending load caused by the local bending exerted from the endless belt layer outside the side edge band of the innermost endless belt layer is the innermost endless belt of the plurality of endless belt layers. In at least one endless belt layer overlying the layer, the thickness of the side edge zone that overlaps the side edge zone of the innermost endless belt layer may be reduced. In this case, the thickness of the side edge zone may be reduced in such a manner that the reduction margin gradually increases from the inside to the outside of the side edge zone.

また、前記最内無端ベルト層の前記側縁帯域に対しそれより外側にある無端ベルト層から及ぼされる前記局部曲げによる曲げ荷重を低減することは、前記複数の無端ベルト層のうちの少なくとも二つの互いに隣接する無端ベルト層の少なくとも一方に於ける他方に対向する面に沿って前記最内無端ベルト層の前記側縁帯域上に重なる側縁帯域の厚みを低減することであってもよい。この場合にも、前記側縁帯域の厚みの低減はその低減代が該側縁帯域の内側から外側へ向けて次第に増大する態様になされてよい。   Further, reducing the bending load due to the local bending exerted from the endless belt layer outside the side edge band of the innermost endless belt layer is at least two of the plurality of endless belt layers. The thickness of the side edge band that overlaps the side edge band of the innermost endless belt layer along the surface of at least one of the endless belt layers adjacent to each other and facing the other may be reduced. Also in this case, the thickness of the side edge band may be reduced in such a manner that the reduction margin gradually increases from the inside to the outside of the side edge band.

前記の局部曲げに対する耐久性を向上させる措置が施される前記側縁帯域は、特に前記窪み上に突き出る可能性のある側縁帯域のみであってよい。   The side edge band to which measures for improving the durability against the local bending are applied may be only the side edge band that may protrude above the depression.

尚、以上は上記の課題を解決する本発明を無端ベルトとして表現したが、中央の首部とその両側に延在する一対の肩部とを有し、前記首部と前記肩部との間の境界部には窪みが形成されている板状の駒部材は従来より公知のものであるので、本発明の本質は、そのような駒部材の該一対の肩部の各々と係合するよう構成された複数の無端ベルト層の重合体よりなる一対の無端ベルト部材にして、前記複数の無端ベルト層のうちの最内層の側縁帯域であって前記駒部材の首部に近い側のみの側縁帯域に局部曲げに対する内表面層の耐久性を向上させる措置が施されていることを特徴とする無端ベルト部材にある。   Although the present invention for solving the above-mentioned problems has been expressed as an endless belt, the above has a central neck portion and a pair of shoulder portions extending on both sides thereof, and a boundary between the neck portion and the shoulder portion. Since the plate-shaped piece member in which the depression is formed in the part is conventionally known, the essence of the present invention is configured to be engaged with each of the pair of shoulder parts of such a piece member. A pair of endless belt members made of a polymer of a plurality of endless belt layers, and a side edge band of the innermost layer of the plurality of endless belt layers, only on the side close to the neck of the piece member The endless belt member is characterized in that measures are taken to improve the durability of the inner surface layer against local bending.

無端ベルトが、特に複数の無端ベルト層の重合体よりなる一対の無端ベルト部材と、中央の首部とその両側に延在する一対の肩部とを有し、前記首部と前記肩部の間の境界部には窪みが形成されており、該一対の肩部の各々にて前記一対の無端ベルト部材の各々と係合するよう構成された多数の板状の駒部材とを備え、中心軸線に沿って互いに対向する円錐状のベルト係合面を呈する一対のプーリ半体よりなる複数のプーリの間に掛け渡される無段変速装置用の無端ベルトである場合には、プーリの周りを走行する湾曲状態の無端ベルト部材に張力が作用している状態で、前記駒部材の首部に近い側の無端ベルト部材の側縁部は、駒部材の肩部より前記窪み上にはみ出すことによって肩部による支持を失い、該ベルト側縁部がそこに作用する張力によりプーリの中心へ向けて内側に局部的に湾曲される虞れがあり、そのとき無端ベルト部材が複数の無端ベルト層の重合体よりなっていると、無端ベルト部材は厚み方向に重なる各無端ベルト層間で相互に横方向にずれることができることによって曲がりやすく、駒部材の首部に近い側の側縁部に於いてのみ大きく局部的に内向きに湾曲し、特に最内層の無端ベルト層は、それ自身の側縁部に作用する張力とその上に重なり合う各無端ベルト層から下向き(プーリ中心へ向かう向き)に及ぼされる押圧力とにより、最も大きく曲げられ、かかる繰返し曲げにより無端ベルト部材の耐久性は、最内無端ベルト層の一方の側のみの側縁帯域の内面表層に於いて最も厳しくなる。そこで、複数の無端ベルト層のうちの最内層の側縁帯域であって駒部材の首部に近い側のみの側縁帯域に対し局部曲げに対する内面表層の耐久性を向上させる措置が施されれば、無端ベルト層のその他の部分、特に他方の側縁部は無垢のままとして、無端ベルト層の耐久性を効果的に向上させることができる。   The endless belt has a pair of endless belt members made of a polymer of a plurality of endless belt layers, a central neck portion and a pair of shoulder portions extending on both sides thereof, and the gap between the neck portion and the shoulder portion. A depression is formed in the boundary portion, and each of the pair of shoulder portions includes a plurality of plate-like piece members configured to engage with each of the pair of endless belt members, and has a central axis. When the belt is an endless belt for a continuously variable transmission that is stretched between a plurality of pulleys comprising a pair of pulley halves having conical belt engaging surfaces facing each other, the belt travels around the pulley. In a state in which tension is applied to the endless belt member in a curved state, the side edge portion of the endless belt member on the side close to the neck portion of the piece member protrudes from the shoulder portion of the piece member onto the recess, thereby causing a shoulder portion. Lose support, the belt edge acts on it If the endless belt member is made of a polymer of a plurality of endless belt layers, the endless belt member may overlap each other in the thickness direction. It is easy to bend by being able to shift laterally between the endless belt layers, and bends inward locally locally only at the side edge close to the neck of the piece member, especially the innermost endless belt layer The endless belt member is bent the most by the tension acting on the side edge of itself and the pressing force exerted downward (direction toward the pulley center) from each endless belt layer overlapping on the end edge belt layer. Durability is most severe in the inner surface layer of the side edge zone on only one side of the innermost endless belt layer. Therefore, if measures are taken to improve the durability of the inner surface layer against local bending with respect to the side edge band of the innermost layer of the plurality of endless belt layers and only the side edge band close to the neck of the piece member Further, the durability of the endless belt layer can be effectively improved by leaving other portions of the endless belt layer, particularly the other side edge portion, intact.

最内無端ベルト層の前記側縁帯域の内面表層の局部曲げに対する耐久性を向上させる措置として、該側縁帯域の内面表層が切除されれば、無端ベルト層全体の横断面積としてはこれをさして減ずることなく、ベルトがプーリの周りを回ることにより生ずる繰返し曲げによって最も疲労しやすい部分が無くなる。この場合、最内無端ベルト層は、当該側縁部にて内面表層部が切除されることによりそれに相当してより曲がりやすくなり(即ち、曲げによりベルト層内に生ずる圧縮応力は小さくなり)、無端ベルト部材の繰返し曲げに対する最も敏感な疲労度はそれだけで低減される。   As a measure for improving the durability against local bending of the inner surface layer of the side edge zone of the innermost endless belt layer, if the inner surface layer of the side edge zone is cut, this is the cross-sectional area of the entire endless belt layer. Without reduction, there is no portion that is most fatigued by repeated bending caused by the belt turning around the pulley. In this case, the innermost endless belt layer is correspondingly more easily bent by cutting the inner surface layer portion at the side edge portion (that is, the compressive stress generated in the belt layer by bending is reduced), By itself, the most sensitive fatigue to repeated bending of an endless belt member is reduced.

一方、最内無端ベルト層の側縁帯域の内面表層の局部曲げに対する耐久性を向上させる措置として、最内無端ベルト層の側縁帯域に対しそれより外側にある無端ベルト層から及ぼされる局部曲げによる曲げ荷重が低減されれば、それに応じて最内無端ベルト層の側縁帯域の内面表層に作用する局部曲げの曲げ応力の大きさや振幅は低減されるので、無端ベルト部材の繰返し曲げに対する最も敏感な疲労度はそれだけで低減される。   On the other hand, as a measure to improve the durability against local bending of the inner surface layer of the inner edge surface layer of the innermost endless belt layer, the local bending exerted from the outer endless belt layer outside the innermost endless belt layer is performed. If the bending load due to the bending is reduced, the magnitude and amplitude of the bending stress of the local bending acting on the inner surface layer of the side edge band of the innermost endless belt layer will be reduced accordingly. Sensitive fatigue is reduced by itself.

複数の無端ベルト層を重ねた無端ベルト部材に於いて、複数の無端ベルト層のうちの最内無端ベルト層の側縁帯域上に重なる少なくとも一つの無端ベルト層について最内無端ベルト層の前記側縁帯域上に重なる側縁帯域の厚みが低減されれば、当該少なくとも一つの無端ベルト層の側縁部に沿って作用する張力の大きさはその厚みの低減に応じて低減するので、当該少なくとも一つの無端ベルト層が最内無端ベルト層の側縁帯域に対し及ぼす局部曲げの曲げ荷重はそれだけ低減し、最内無端ベルト層の側縁帯域がそれより外側にある無端ベルト層から及ぼされる局部曲げの曲げ荷重はそれ相当に低減する。この場合、側縁帯域の厚みの低減が、その低減代を該側縁帯域の内側から外側へ向けて次第に増大させる態様になされていれば、最内無端ベルト層の側縁帯域にそれより外側にある無端ベルト層から及ぼされる局部曲げの曲げ荷重の分布に斑を生じさせず、該曲げ荷重分布の斑によって最内無端ベルト層の側縁帯域の何処かに曲げ荷重分布のピーク値が生ずることがないようにして、無端ベルト部材の繰返し曲げに対する最も敏感な疲労度をそれ相当に低減させることができる。   In the endless belt member in which a plurality of endless belt layers are stacked, the side of the innermost endless belt layer with respect to at least one endless belt layer overlapping the side edge band of the innermost endless belt layer among the plurality of endless belt layers. If the thickness of the side edge zone that overlaps the edge zone is reduced, the magnitude of the tension acting along the side edge of the at least one endless belt layer is reduced as the thickness decreases, so The bending load of local bending that one endless belt layer exerts on the side edge zone of the innermost endless belt layer is reduced accordingly, and the side edge zone of the innermost endless belt layer is exerted from the endless belt layer on the outer side. The bending load of bending is considerably reduced. In this case, if the reduction of the thickness of the side edge band is such that the reduction margin is gradually increased from the inner side to the outer side of the side edge band, the outer side of the side edge band of the innermost endless belt layer is further reduced. The bending load distribution of the local bending exerted from the endless belt layer on the inner side of the inner endless belt layer is caused by the uneven bending load distribution. In this way, the most sensitive fatigue to the repeated bending of the endless belt member can be considerably reduced.

また、複数の無端ベルト層を重ねた無端ベルト部材に於いて、複数の無端ベルト層のうちの少なくとも二つの互いに隣接する無端ベルト層の少なくとも一方に於ける他方に対向する面に沿って最内無端ベルト層の側縁帯域上に重なる側縁帯域の厚みが低減されれば、一つの無端ベルト層の側縁部の厚みの低減により該一つの無端ベルト層が最内無端ベルト層の側縁帯域に対し及ぼす局部曲げの曲げ荷重が低減されることに加えて、二つの互いに隣接する無端ベルト層間に上側の無端ベルト層より下側の無端ベルト層への側縁部局部曲げに伴う曲げ荷重の伝播が軽減され、最内無端ベルト層の側縁帯域がそれより外側にある無端ベルト層から及ぼされる局部曲げの曲げ荷重は二重の効果により低減される。この場合にも、側縁帯域の厚みの低減が、その低減代を該側縁帯域の内側から外側へ向けて次第に増大させる態様になされていれば、最内無端ベルト層の側縁帯域にそれより外側にある無端ベルト層から及ぼされる局部曲げの曲げ荷重の分布に斑を生じさせず、該曲げ荷重分布の斑によって最内無端ベルト層の側縁帯域の何処かに曲げ荷重分布のピーク値が生ずることがないようにして、無端ベルト部材の繰返し局部曲げに対する最も敏感な疲労度をそれ相当に低減させることができる。   Further, in the endless belt member in which a plurality of endless belt layers are stacked, at least two of the plurality of endless belt layers adjacent to each other in at least one of the endless belt layers are arranged along the innermost surface. If the thickness of the side edge band that overlaps the side edge band of the endless belt layer is reduced, the one endless belt layer becomes the side edge of the innermost endless belt layer by reducing the thickness of the side edge of one endless belt layer. In addition to reducing the bending load of the local bending on the band, the bending load associated with the local bending of the side edge to the endless belt layer below the upper endless belt layer between two adjacent endless belt layers The bending load of the local bending exerted from the endless belt layer with the side edge band of the innermost endless belt layer on the outer side is reduced by a double effect. Also in this case, if the reduction of the thickness of the side edge band is made such that the reduction margin is gradually increased from the inside to the outside of the side edge band, it is reduced to the side edge band of the innermost endless belt layer. The bending load distribution of the local bending exerted from the outer endless belt layer on the outer side is not spotted, and the peak value of the bending load distribution somewhere in the side edge band of the innermost endless belt layer due to the unevenness of the bending load distribution. The most sensitive fatigue to repeated local bending of the endless belt member can be considerably reduced.

局部曲げに対する耐久性を向上させる措置が施される側縁帯域が、前記窪み上に突き出る可能性のある側縁帯域のみされれば、駒部材の肩部により支持されない状態が生ずる側縁帯域の幅自体は無端ベルトの全幅に比して極僅かであり、この僅かの幅の側縁帯域にそれが肩部により支持されないことによる局部曲げに対し内面表層局部曲げに対する耐久性を向上させる措置を講ずることは、上記の特許文献1〜4に記載されている如き無端ベルトの横断面形状の変更と比較して、無端ベルトの横断面積を減ずる程度は極軽微であり、即ち無端ベルトの横断面の殆どの部分を無垢のままとし、この種の無端ベルトの横断面的強度を高く維持しつつ、その僅かの側縁帯域が局部曲げにより無端ベルトの耐久性を低下させることを効果的に抑制することができる。   If the side edge band to which measures for improving the durability against local bending are applied is only the side edge band that may protrude onto the recess, the side edge band that is not supported by the shoulder of the piece member is generated. The width itself is negligible compared to the full width of the endless belt, and measures to improve the durability against local bending of the inner surface layer against local bending due to the fact that it is not supported by the shoulder in the marginal band of this slight width. Compared with the change in the cross-sectional shape of the endless belt as described in Patent Documents 1 to 4 described above, the degree to which the cross-sectional area of the endless belt is reduced is extremely small. Most parts of the belt are kept solid, and while maintaining the high cross-sectional strength of this type of endless belt, its slight side band effectively suppresses the endurance belt from deteriorating due to local bending. Do Door can be.

図1は、本発明による無端ベルトの一つの実施の形態としての無端ベルト1がプーリ2と3の間に掛け渡されたベルト式無段変速装置の一例を示す概略図である。無端ベルト1は多数の駒部材10と一対の無端ベルト12a、12bとを組み合わせたものであり、図1に表わされている構造の限りでは、無端ベルト1はこの種の公知の無端ベルトと変わらない。プーリ2および3は、それぞれ互いに中心軸線2cおよび3cに沿って対向する円錐状のベルト係合面を呈する一対のプーリ半体を備えており、図1に於いては各一対のプーリ半体のうちの一方である2aおよび3aのみが見えている。図1に於ける切断線II−IIによる断面が、図2として示されている。図2は隣接する二つの駒部材10の間に沿ってプーリ半体2aおよび2bと一対のベルト部材12aおよび12bとを切断した図である。図2についても、図には、この種の公知の無端ベルトに対比した本発明の特徴は、それが寸法的に微細であることによって現れていない。プーリ半体2aおよび2bはそれぞれ円錐状のベルト係合面2cおよび2dを呈しており、円錐状ベルト係合面2cおよび2dの頂角は互いに同一の角度となっている。プーリ3についてのプーリ半体3aおよびこれと対をなす他方のプーリ半体(図示せず)の更なる詳細は図示されていないが、これらのプーリ半体についても同様のベルト係合面が設けられている。   FIG. 1 is a schematic view showing an example of a belt-type continuously variable transmission in which an endless belt 1 as an embodiment of an endless belt according to the present invention is stretched between pulleys 2 and 3. The endless belt 1 is a combination of a number of piece members 10 and a pair of endless belts 12a and 12b. As far as the structure shown in FIG. 1 is concerned, the endless belt 1 is a known endless belt of this type. does not change. Each of the pulleys 2 and 3 includes a pair of pulley halves each having a conical belt engaging surface facing each other along the central axes 2c and 3c. In FIG. Only one of 2a and 3a is visible. A section taken along section line II-II in FIG. 1 is shown in FIG. FIG. 2 is a view in which the pulley halves 2a and 2b and the pair of belt members 12a and 12b are cut along two adjacent piece members 10. FIG. Also for FIG. 2, the feature of the present invention compared to this kind of known endless belt is not shown in the figure because it is dimensionally fine. The pulley halves 2a and 2b have conical belt engaging surfaces 2c and 2d, respectively, and the apex angles of the conical belt engaging surfaces 2c and 2d are the same. Further details of the pulley half 3a for the pulley 3 and the other pulley half (not shown) paired therewith are not shown, but a similar belt engagement surface is provided for these pulley halves. It has been.

無端ベルト部材12aおよび12bは、図示の例では略同一厚みの複数の無端ベルト層12a−1,12a−2,...12a−nおよび12b−1,12b−2,...12b−nを重ね合わせたものとなっている。(図2では中間部の厚み表示が破線にて省略されている。)無端ベルト層12a−1等はマルエージング鋼等の鋼板によりなっていてよい。   In the illustrated example, the endless belt members 12a and 12b include a plurality of endless belt layers 12a-1, 12a-2,. . . 12a-n and 12b-1, 12b-2,. . . 12b-n is superimposed. (In FIG. 2, the thickness display of the intermediate portion is omitted by a broken line.) The endless belt layer 12a-1 and the like may be made of a steel plate such as maraging steel.

駒部材10は、そのヘッド部10aの一方の面に突き出た凸部10bと他方の面より窪んだ凹部10cとを備え、互いに隣接するものどうしの凸部10bと凹部10cとが互いに係合することにより、互いに隣接する駒部材10の間の相対位置を規制する駒部材相互位置決め手段が構成されている。各駒部材10のヘッド部10aには首部10dを介して基部10eが繋がっており、基部10eの両側縁がプーリ2および3のベルト係合面2c、2d等と係合する一対のプーリ係合面10fおよび10gをなしている。基部10eには一対の無端のベルト部材を受ける一対の肩部10hおよび10iが設けられている。首部10dと肩部10hおよび10iの間の境界部には、滑らかに湾曲した窪み10jおよび10kが形成されている。図2には現れていないが、肩部10hおよび10iはそれぞれ径Rの円弧または楕円による中高形状に形成されている。   The piece member 10 includes a convex portion 10b protruding from one surface of the head portion 10a and a concave portion 10c recessed from the other surface, and the adjacent convex portions 10b and concave portions 10c engage with each other. Thereby, the piece member mutual positioning means which controls the relative position between the piece members 10 adjacent to each other is configured. A base portion 10e is connected to the head portion 10a of each piece member 10 through a neck portion 10d, and a pair of pulley engagements in which both side edges of the base portion 10e engage with the belt engagement surfaces 2c, 2d of the pulleys 2 and 3, etc. Surfaces 10f and 10g are formed. The base portion 10e is provided with a pair of shoulder portions 10h and 10i for receiving a pair of endless belt members. At the boundary between the neck 10d and the shoulders 10h and 10i, recesses 10j and 10k that are smoothly curved are formed. Although not appearing in FIG. 2, the shoulder portions 10 h and 10 i are each formed in a medium-high shape by an arc or ellipse having a radius R.

上記の如き無端ベルト1に於ける各要部の寸法或は数値は、一例として、以下の通りである。
Wo=13mm
Ws=11mm
Wb=12mm
t=0.19mm
n=9
R=250mm
As an example, the dimensions or numerical values of the main parts of the endless belt 1 as described above are as follows.
Wo = 13mm
Ws = 11mm
Wb = 12mm
t = 0.19mm
n = 9
R = 250mm

図3は、図2にてIIIを付した部分を拡大し、プーリの周りを走行する湾曲状態の無端ベルト部材に張力が作用している状態で無端ベルト部材の側縁部が駒部材の肩部の縁よりはみ出すことによって肩部による支持を失い、該側縁部がプーリの中心へ向けて内向きに局部的に湾曲した状態を示す図である。但し、図3に於いて、湾曲の度合は、図示の都合上誇張されている。尚、無端ベルト部材の駒部材首部10dとは隔たった側の側縁部は、図2に示されている如く、その端縁まで駒部材の肩部10hまたは10iにより完全に支持されており、かかる側縁部には上記の如き局部的湾曲は生じず、これらの側縁部は図2にてIIIを付した部分について以下に説明する措置は施されず、無垢のままである。   FIG. 3 is an enlarged view of the portion marked III in FIG. 2, and the side edge of the endless belt member is the shoulder of the piece member in a state where tension is applied to the curved endless belt member running around the pulley. It is a figure which shows the state which lost the support by a shoulder part by protruding from the edge of a part, and this side edge part curved inward toward the center of a pulley. However, in FIG. 3, the degree of curvature is exaggerated for convenience of illustration. Incidentally, the side edge portion of the endless belt member on the side separated from the piece member neck portion 10d is completely supported by the shoulder portion 10h or 10i of the piece member up to the end edge, as shown in FIG. Such side edges are not locally bent as described above, and these side edges are not subjected to the measures described below with respect to the portion marked III in FIG.

図3より理解される通り、このとき、無端ベルト部材が複数の無端ベルト層の重合体よりなっていると、無端ベルト部材は厚み方向に重なる各無端ベルト層間で相互に横方向にずれることができるので曲がりやすいことから、肩部による支持が失われた側縁部は大きく内向きに湾曲し、しかも特に最内層の無端ベルト層12b−1は、それ自身の側縁部に作用する張力とその上に重なり合う無端ベルト層12b−2〜12b−nから内向きに及ぼされる押圧力とにより、最も大きく曲げられる。従って、かかる曲げの繰返しによる疲労度は、最内無端ベルト層12b−1の窪み10kに臨んだ側縁部(無端ベルト12aに於いては12a−1の窪み10jに臨んだ側縁部)に於いて最も高くなり、かかる無端ベルト層重合型無端ベルト部材の疲労による強度低下はこの部分から始まる。   As understood from FIG. 3, at this time, if the endless belt member is made of a polymer of a plurality of endless belt layers, the endless belt member may be shifted laterally between the endless belt layers overlapping in the thickness direction. Since it is possible to bend easily, the side edge portion that is not supported by the shoulder portion is greatly inwardly curved, and in particular, the innermost endless belt layer 12b-1 has a tension acting on its own side edge portion. It is bent most greatly by the pressing force exerted inward from the endless belt layers 12b-2 to 12b-n that overlap therewith. Accordingly, the degree of fatigue due to repeated bending is exerted on the side edge facing the recess 10k of the innermost endless belt layer 12b-1 (the side edge facing the recess 10j of 12a-1 in the endless belt 12a). However, the strength reduction due to fatigue of such an endless belt layer polymerization type endless belt member starts from this portion.

図4は、これに対する本発明による対抗措置のいくつかの実施の形態を説明の冗長化回避のため重複して一つの図に集めて示す図であり、それが示す無端ベルト内の箇所は、図3との対比に於いて明らかな通り、図3の要部に対応している。   FIG. 4 is a diagram showing several embodiments of the countermeasures according to the present invention against this in order to avoid duplication of explanation, and are gathered together in one figure, and the points in the endless belt shown by As is clear from the comparison with FIG. 3, it corresponds to the main part of FIG.

本発明による対抗措置、即ち最内無端ベルト層(図4で見て無端ベルト層12b−1、以下同様)の側縁部であって駒部材の肩部10iにより支持されない状態が生ずる側縁帯域12b−1−wのみに於ける内面表層12b−1−w−sに対し疲労を低減する措置、の第一は、該内面表層12b−1−w−sを図4に示す如く切除することである。内面表層12b−1−w−sが切除されれば、ベルトがプーリの周りを回ることにより生ずる側縁帯域12b−1−wの局部繰返し曲げによって最も疲労しやすい部分が無くなる。この場合、最内無端ベルト層12b−1の側縁帯域12b−1−wは内面表層12b−1−w−sの切除によってその分薄くなって曲げにより生ずる曲げ応力は小さくなるので、側縁帯域12b−1−wの残る部分は内面表層12b−1−w−sに比して局部繰返し曲げに対しより疲労しにくくなり、この部分を起点とする無端ベルト部材の強度低下をより効果的に防止することができる。   Countermeasure according to the present invention, that is, the side edge band of the inner edgeless belt layer (endless belt layer 12b-1 in FIG. 4), which is not supported by the shoulder 10i of the piece member. The first of the measures for reducing fatigue with respect to the inner surface layer 12b-1-w-s only at 12b-1-w is to cut the inner surface layer 12b-1-w-s as shown in FIG. It is. When the inner surface layer 12b-1-w-s is cut away, the portion that is most easily fatigued by local repeated bending of the side edge band 12b-1-w caused by the belt turning around the pulley is eliminated. In this case, the side edge band 12b-1-w of the innermost endless belt layer 12b-1 is thinned by cutting the inner surface layer 12b-1-w-s, and the bending stress caused by bending is reduced. The remaining portion of the band 12b-1-w is less likely to be fatigued by repeated local bending than the inner surface layer 12b-1-w-s, and the strength reduction of the endless belt member starting from this portion is more effective. Can be prevented.

本発明による上記対抗措置の第二は、最内無端ベルト層12b−1の側縁部であって駒部材の肩部10iにより支持されない状態が生ずる側縁帯域12b−1−wに対しそれより外側にある無端ベルト層から及ぼされる曲げ荷重を低減することである。これには、基本的に以下の二つの態様がある。その一つは、複数の無端ベルト層のうちの最内無端ベルト層の上に重なる少なくとも一つの無端ベルト層(例えば12b−2)に於いて、下の無端ベルト層の側縁帯域12b−1−w上に重なるその側縁帯域(12b−2−w)の厚みを低減することである。かかる無端ベルト層側縁帯域の厚みの低減は、図示の例では無端ベルト層12b−2〜12b−9のいずれについて行われてもよく、またいくつの無端ベルト層について行われてもよい。   The second of the above countermeasures according to the present invention is the side edge portion of the innermost endless belt layer 12b-1 that is not supported by the shoulder portion 10i of the piece member. It is to reduce the bending load exerted from the outer endless belt layer. There are basically the following two modes. One of them is that in at least one endless belt layer (for example, 12b-2) that overlaps the innermost endless belt layer among the plurality of endless belt layers, the side edge band 12b-1 of the lower endless belt layer is used. Reducing the thickness of the side edge band (12b-2-w) overlying -w. The thickness reduction of the endless belt layer side edge zone may be performed for any of the endless belt layers 12b-2 to 12b-9 in the illustrated example, and may be performed for any number of endless belt layers.

上記の如く複数の無端ベルト層のうちの最内無端ベルト層の側縁帯域12b−1−w上に重なる任意の一つの無端ベルト層(例えば12b−2)に於いてその側縁帯域(12b−2−w)の厚みが低減されれば、当該無端ベルト層の側縁部に沿って作用する張力の大きさはその厚みの低減に応じて低減するので、当該無端ベルト層が最内無端ベルト層の側縁帯域に対し及ぼす曲げ荷重はそれだけ低減し、最内無端ベルト層の側縁帯域がそれより外側にある無端ベルト層から及ぼされる局部曲げの曲げ荷重はそれ相当に低減する。   As described above, in any one endless belt layer (for example, 12b-2) overlapping the side edge band 12b-1-w of the innermost endless belt layer among the plurality of endless belt layers, the side edge band (12b If the thickness of -2-w) is reduced, the magnitude of the tension acting along the side edge of the endless belt layer is reduced in accordance with the reduction in the thickness, so that the endless belt layer is the innermost endless belt. The bending load exerted on the side edge band of the belt layer is reduced accordingly, and the bending load of the local bending exerted from the endless belt layer on which the side edge band of the innermost endless belt layer is outside is considerably reduced.

また、上記の側縁帯域の厚みの低減は、側縁帯域の一部または全体にわたって一様にまたはその他任意の同効果を発揮することのできる態様にて行なわれてよいが、特に図4に12b−1−w−u,12b−2−w−d,12b−2−w−u〜12b−9−w−d,12b−9−w−uとして例示されている如くその低減代が該側縁帯域の内側から外側へ向けて次第に増大する態様になされてよく、そのようにすることによって最内無端ベルト層の側縁帯域12b−1−wにそれより外側にある無端ベルト層から及ぼされる局部曲げの曲げ荷重の分布に斑を生じさせず、該曲げ荷重分布の斑によって最内無端ベルト層の側縁帯域の何処かに曲げ荷重分布のピーク値が生ずることがないようにして、本発明の作用効果を最大限に発揮させることができる。尚、図4に於いて、側縁帯域の厚みの低減は、側縁帯域の曲り度が図示の都合上誇張して示されているのと同様に、図示の都合上誇張して示されている。   Further, the reduction of the thickness of the side edge band may be performed uniformly in a part or the whole of the side edge band or in an aspect capable of exhibiting any other same effect, particularly in FIG. 12b-1-wu, 12b-2-wd, 12b-2-wu to 12b-9-wd, 12b-9-wu, the reduction allowance is It may be made to increase gradually from the inside to the outside of the side edge band, and by doing so, it extends from the endless belt layer outside it to the side edge band 12b-1-w of the innermost endless belt layer. So that the bending load distribution of the local bending is not uneven, and the bending load distribution does not cause a peak value of the bending load distribution anywhere in the side edge band of the innermost endless belt layer, To maximize the effects of the present invention It can be. In FIG. 4, the reduction of the thickness of the side edge band is exaggerated for the convenience of illustration in the same manner as the degree of curvature of the side edge band is exaggerated for convenience of illustration. Yes.

本発明による上記対抗措置第二の基本的態様の他の一つは、複数の無端ベルト層のうちの少なくとも二つの互いに隣接する無端ベルト層(例えば12b−1および12b−2)の少なくとも一方に於ける他方に対向する面に沿って最内無端ベルト層の側縁帯域12b−1−w上に重なる側縁帯域の厚みを低減することである。この場合、二つの互いに隣接する無端ベルト層を12b−1および12b−2とする例では、厚み低減が無端ベルト層12b−1について行われるとすれば、それは無端ベルト層12b−1の上面に沿っての厚みの低減(12b−1−w−u)であり、厚み低減が無端ベルト層12b−2について行われるとすれば、それは無端ベルト層12b−2の下面に沿っての厚みの低減(12b−2−w−d)である。このように二つの互いに隣接する無端ベルト層の側縁帯域間に隙間を設ける観点からの無端ベルト層側縁帯域の厚みの低減も、図示の例では無端ベルト層12b−1〜12b−9のいずれについて行われてもよく、またいくつの無端ベルト層について行われてもよい。   Another one of the second basic aspects of the above countermeasures according to the present invention is that at least one of the endless belt layers adjacent to each other (for example, 12b-1 and 12b-2) of the plurality of endless belt layers is provided. It is to reduce the thickness of the side edge band that overlaps the side edge band 12b-1-w of the innermost endless belt layer along the surface facing the other side. In this case, in the example in which the two endless belt layers adjacent to each other are 12b-1 and 12b-2, if thickness reduction is performed on the endless belt layer 12b-1, it is applied to the upper surface of the endless belt layer 12b-1. If the thickness reduction is performed on the endless belt layer 12b-2, it is the thickness reduction along the lower surface of the endless belt layer 12b-2. (12b-2-w-d). In this way, the thickness of the endless belt layer side edge band from the viewpoint of providing a gap between the side edge bands of two adjacent endless belt layers is also reduced in the illustrated example of the endless belt layers 12b-1 to 12b-9. Any number of endless belt layers may be used.

上記の如く複数の無端ベルト層のうちの少なくとも二つの互いに隣接する無端ベルト層の少なくとも一方に於ける最内無端ベルト層の他方に対向する面に沿って側縁帯域12b−1−w上に重なる側縁帯域の厚みが低減されれば、厚みが低減された少なくとも一方の無端ベルト層の側縁部が最内無端ベルト層の側縁帯域に対し及ぼす曲げ荷重が低減されることに加えて、二つの互いに隣接する無端ベルト層の間にて上側の無端ベルト層より下側の無端ベルト層への側縁部曲げに伴う曲げ荷重の伝播が軽減され、最内無端ベルト層の側縁帯域がそれより外側にある無端ベルト層から及ぼされる局部曲げの曲げ荷重は二重の効果により低減される。   As described above, at least two of the endless belt layers adjacent to each other in at least one of the endless belt layers adjacent to each other on the side edge band 12b-1-w along the surface facing the other of the innermost endless belt layers. If the thickness of the overlapping side edge zone is reduced, the bending load exerted on the side edge zone of the innermost endless belt layer by the side edge portion of at least one endless belt layer having the reduced thickness is reduced. The propagation of the bending load accompanying the bending of the side edge to the endless belt layer below the upper endless belt layer is reduced between two adjacent endless belt layers, and the side edge band of the innermost endless belt layer is reduced. The bending load of the local bending exerted from the endless belt layer on the outer side is reduced by the double effect.

この場合にも、上記の側縁帯域の厚みの低減は、側縁帯域の一部または全体にわたって一様にまたはその他任意の同効果を発揮することのできる態様にて行なわれてよいが、特に図4に例示されている如くその低減代が該側縁帯域の内側から外側へ向けて次第に増大する態様になされてよく、そのようにすることによって、二つの互いに隣接する無端ベルト層の間の当りを滑らかにし、最内無端ベルト層の側縁帯域12b−1−wにそれより外側にある無端ベルト層から及ぼされる曲げ荷重の分布に斑を生じさせず、該曲げ荷重分布の斑によって最内無端ベルト層の側縁帯域の何処かに曲げ荷重分布のピーク値が生ずることがないようにして、本発明の作用効果を最大限に発揮させることができる。上記の隙間を設ける観点からの側縁帯域の厚みの低減についても、図4に於ける側縁帯域の厚みの低減は、側縁帯域の曲り度が図示の都合上誇張して示されているのと同様に、図示の都合上誇張して示されている。   Also in this case, the reduction of the thickness of the side edge band may be performed uniformly or over any part of the side edge band or in a mode that can exhibit any other same effect. As illustrated in FIG. 4, the reduction margin may be gradually increased from the inside to the outside of the side edge band, and by doing so, between two adjacent endless belt layers. The contact is smooth and the distribution of the bending load exerted from the endless belt layer on the outer edge belt layer 12b-1-w of the innermost endless belt layer is not caused. The peak value of the bending load distribution does not occur anywhere in the side edge band of the inner endless belt layer, so that the operational effects of the present invention can be maximized. Regarding the reduction of the thickness of the side edge band from the viewpoint of providing the above gap, the reduction of the thickness of the side edge band in FIG. 4 is exaggerated for convenience of illustration. As in the case of FIG. 2, it is exaggerated for convenience of illustration.

以上のいずれの実施の形態に於いても、無端ベルトの最内層の側縁部であって駒部材の肩部により支持されない状態が生ずる側縁帯域についての該側縁帯域が肩部により支持されないときの局部曲げに対する内面表層の耐久性を向上措置は、無端ベルトの全幅のうちの一方の側縁部の極僅かな幅の部分に対して施される措置であり、その部分のベルト層の厚みが幾分低減されても、それによるベルトの横断面積の減少はベルトの全横断面積に比して極僅かであり、またそれは該一方側縁帯域以外の部分の強度に何ら悪影響をおよぼすものではない。   In any of the above embodiments, the side edge band of the innermost layer of the endless belt that is not supported by the shoulder part of the piece member is not supported by the shoulder part. The measure for improving the durability of the inner surface layer against local bending is a measure applied to a very small width portion of one side edge of the entire width of the endless belt, and the belt layer of that portion Even if the thickness is somewhat reduced, the reduction in the cross-sectional area of the belt is negligible compared to the total cross-sectional area of the belt, and it has no adverse effect on the strength of the part other than the one side edge band. is not.

以上に於いては本発明をいくつかの実施の形態について詳細に説明したが、これらの実施の形態について本発明の範囲内にて種々の変更が可能であることは当業者にとって明らかであろう。   While the present invention has been described in detail with respect to several embodiments thereof, it will be apparent to those skilled in the art that various modifications can be made to these embodiments within the scope of the present invention. .

本発明による無端ベルトの一つの実施の形態としての無端ベルトが二つのプーリ間に掛け渡されたベルト式無段変速装置の一例を示す概略図。BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows an example of the belt-type continuously variable transmission with which the endless belt as one embodiment of the endless belt by this invention was spanned between two pulleys. 図1に於ける切断線II−IIによる断面図。Sectional drawing by the cutting line II-II in FIG. 図2にてIIIを付した部分を拡大し、プーリの周りを走行する湾曲状態の無端ベルト部材に張力が作用している状態で無端ベルト部材の側縁部が駒部材の肩部の縁よりはみ出すことによって肩部による支持を失い、該側縁部がプーリの中心へ向けて内向きに湾曲した状態を示す図。2 is enlarged, and the side edge portion of the endless belt member is more than the shoulder edge of the piece member in a state where tension is applied to the curved endless belt member traveling around the pulley. The figure which loses the support by a shoulder part by protruding and shows the state which this side edge curved inward toward the center of a pulley. 本発明のいくつかの実施の形態を重複して一つの図に集めて示す図であり、それが示す無端ベルト内の箇所は図3の要部に対応する図。FIG. 4 is a diagram illustrating several embodiments of the present invention which are collectively shown in one drawing, and the portions in the endless belt indicated by the embodiments correspond to the main part of FIG. 3.

符号の説明Explanation of symbols

1…無端ベルト、2…プーリ、2a,2b…プーリ半体、2c…プーリ半体の中心軸線、2c,2d…プーリ半体のベルト係合面、3…プーリ、3a…プーリ半体、3c…プーリ半体の中心軸線、10…駒部材、10a…ヘッド部、10b…凸部、10c…凹部、10d…首部、10e…基部、10f,10g…プーリ係合面、10h,10i…肩部、10j,10k…窪み、12a,12b…無端ベルト部材、12a−1〜12a−9,12b−1〜12b−9…無端ベルト層、12a−1−w〜12a−9−w,12b−1−w〜12b−9−w…無端ベルト層の側縁帯域、12b−1−w―s…最内無端ベルト層側縁帯域の内面表層、12b−1−w−u〜12b−9−w−u,12b−2−w−d〜12b−2−d〜12b−9−w−d…無端ベルト層の厚み低減部   DESCRIPTION OF SYMBOLS 1 ... Endless belt, 2 ... Pulley, 2a, 2b ... Pulley half body, 2c ... Central axis of pulley half body, 2c, 2d ... Belt engagement surface of pulley half body, 3 ... Pulley, 3a ... Pulley half body, 3c ... center axis of pulley half, 10 ... piece member, 10a ... head part, 10b ... convex part, 10c ... concave part, 10d ... neck part, 10e ... base part, 10f, 10g ... pulley engaging surface, 10h, 10i ... shoulder part 10j, 10k ... depression, 12a, 12b ... endless belt member, 12a-1 to 12a-9, 12b-1 to 12b-9 ... endless belt layer, 12a-1-w to 12a-9-w, 12b-1 -W to 12b-9-w ... side edge band of endless belt layer, 12b-1-w-s ... inner surface of innermost endless belt layer side edge band, 12b-1-w-u to 12b-9-w -U, 12b-2-wd to 12b-2-d to 12b-9-w d ... thickness reduction portion of the endless belt layer

Claims (8)

複数の無端ベルト層の重合体よりなる一対の無端ベルト部材と、中央の首部とその両側に延在する一対の肩部とを有し、前記首部と前記肩部との間の境界部には窪みが形成されており、該一対の肩部の各々にて前記一対の無端ベルト部材の各々と係合するよう構成された多数の板状の駒部材とを備え、中心軸線に沿って互いに対向する円錐状のベルト係合面を呈する一対のプーリ半体よりなる複数のプーリの間に掛け渡される無段変速装置用の無端ベルトにして、前記複数の無端ベルト層のうちの最内層の側縁帯域であって前記駒部材の首部に近い側のみの側縁帯域に局部曲げに対する内面表層の耐久性を向上させる措置が施されていることを特徴とする無端ベルト。   A pair of endless belt members made of a polymer of a plurality of endless belt layers, a central neck portion and a pair of shoulder portions extending on both sides thereof, and a boundary portion between the neck portion and the shoulder portion A plurality of plate-like piece members configured to engage with each of the pair of endless belt members at each of the pair of shoulder portions, and facing each other along a central axis An endless belt for a continuously variable transmission that is spanned between a plurality of pulleys comprising a pair of pulley halves exhibiting a conical belt engaging surface, and the innermost layer side of the plurality of endless belt layers An endless belt characterized in that a measure for improving the durability of the inner surface layer against local bending is applied to a side edge zone only on the side close to the neck of the piece member. 前記最内無端ベルト層の前記側縁帯域の内面表層の局部曲げに対する耐久性を向上させる措置は、前記側縁帯域の内面表層を切除することであることを特徴とする請求項1に記載の無端ベルト。   The measure for improving durability against local bending of the inner surface layer of the side edge zone of the innermost endless belt layer is to cut the inner surface layer of the side edge zone. Endless belt. 前記最内無端ベルト層の前記側縁帯域の内面表層の局部曲げに対する耐久性を向上させる措置は、前記最内無端ベルト層の前記側縁帯域に対しそれより外側にある無端ベルト層から及ぼされる前記局部曲げによる曲げ荷重を低減することであることを特徴とする請求項1に記載の無端ベルト。   Measures to improve the durability against local bending of the inner surface layer of the side edge zone of the innermost endless belt layer are effected from an endless belt layer outside the side edge zone of the innermost endless belt layer. The endless belt according to claim 1, wherein a bending load due to the local bending is reduced. 前記最内無端ベルト層の前記側縁帯域に対しそれより外側にある無端ベルト層から及ぼされる前記局部曲げによる曲げ荷重を低減することは、前記複数の無端ベルト層のうちの前記最内無端ベルト層の上に重なる少なくとも一つの無端ベルト層に於いて前記最内無端ベルト層の前記側縁帯域上に重なる側縁帯域の厚みを低減することであることを特徴とする請求項3に記載の無端ベルト。   Reducing the bending load caused by the local bending exerted from the endless belt layer outside the side edge band of the innermost endless belt layer is the innermost endless belt of the plurality of endless belt layers. 4. The thickness of a side edge zone that overlaps the side edge zone of the innermost endless belt layer in at least one endless belt layer that overlies the layer. Endless belt. 前記最内無端ベルト層の前記側縁帯域に対しそれより外側にある無端ベルト層から及ぼされる前記局部曲げによる曲げ荷重を低減することは、前記複数の無端ベルト層のうちの少なくとも二つの互いに隣接する無端ベルト層の少なくとも一方に於ける他方に対向する面に沿って前記最内無端ベルト層の前記側縁帯域上に重なる側縁帯域の厚みを低減することであることを特徴とする請求項3に記載の無端ベルト。   Reducing the bending load due to the local bending exerted from the endless belt layer outside the side edge zone of the innermost endless belt layer is adjacent to at least two of the plurality of endless belt layers. The thickness of a side edge band that overlaps the side edge band of the innermost endless belt layer along a surface of at least one of the endless belt layers facing the other is reduced. The endless belt according to 3. 前記側縁帯域の厚みの低減はその低減代が該側縁帯域の内側から外側へ向けて次第に増大する態様になされていることを特徴とする請求項4または5に記載の無端ベルト。   6. The endless belt according to claim 4, wherein the reduction of the thickness of the side edge band is such that the reduction margin gradually increases from the inside to the outside of the side edge band. 前記の局部曲げに対する耐久性を向上させる措置が施される前記側縁帯域は前記窪み上に突き出る可能性のある側縁帯域のみであることを特徴とする請求項1〜6のいずれかに記載の無端ベルト。   The said side edge zone | band to which the measure which improves the durability with respect to the said local bending is given is only a side edge zone | band which may protrude on the said hollow, The one in any one of Claims 1-6 characterized by the above-mentioned. Endless belt. 中央の首部とその両側に延在する一対の肩部とを有し、前記首部と前記肩部との間の境界部には窪みが形成されている多数の板状の駒部材の該一対の肩部の各々と係合するよう構成された複数の無端ベルト層の重合体よりなる一対の無端ベルト部材にして、前記複数の無端ベルト層のうちの最内層の側縁帯域であって前記駒部材の首部に近い側のみの側縁帯域に局部曲げに対する内表面層の耐久性を向上させる措置が施されていることを特徴とする無端ベルト部材。
The pair of plate-shaped piece members having a central neck portion and a pair of shoulder portions extending on both sides of the central neck portion, each of which has a depression formed in a boundary portion between the neck portion and the shoulder portion. A pair of endless belt members made of a polymer of a plurality of endless belt layers configured to be engaged with each of the shoulder portions, the side edge bands of the innermost layer of the plurality of endless belt layers, An endless belt member characterized in that a measure for improving durability of the inner surface layer against local bending is applied to a side edge band only on a side close to the neck of the member.
JP2004218997A 2004-07-27 2004-07-27 Endless belt with improved durability of inner surface layer along side edge Pending JP2006038100A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009204029A (en) * 2008-02-26 2009-09-10 Toyota Motor Corp Transmission belt and its assembling method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009204029A (en) * 2008-02-26 2009-09-10 Toyota Motor Corp Transmission belt and its assembling method

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