JPH0514719U

JPH0514719U - Pulley for continuously variable transmission

Info

Publication number: JPH0514719U
Application number: JP7120591U
Authority: JP
Inventors: 孝彦邨瀬; 鉱三山内
Original assignee: Aichi Machine Industry Co Ltd
Current assignee: Aichi Machine Industry Co Ltd
Priority date: 1991-08-08
Filing date: 1991-08-08
Publication date: 1993-02-26

Abstract

(57)【要約】【目的】Ｖベルトが掛装される円錐面間のくさび角を
Ｖベルトに加わる浮き上がり力を確保しつつ小さくでき
る無段変速機用プーリの提供。【構成】固定プーリ２と可動プーリ３とからなる無段
変速機用プーリの固定プーリ２及び可動プーリ３のＶベ
ルト４と接する円錐面２ａ，３ａに摩擦係数の低い表面
処理層５，６を形成することで、円錐面２ａ，３ａ間の
くさび角αが小さくても浮き上がり力Ｗを確保できる。 (57) [Summary] [Object] To provide a pulley for a continuously variable transmission that can reduce the wedge angle between conical surfaces on which the V-belt is mounted while ensuring the lifting force applied to the V-belt. [Structure] Surface treatment layers 5 and 6 having a low friction coefficient are provided on the conical surfaces 2a and 3a of the fixed pulley 2 and the movable pulley 3 which are in contact with the V belt 4 of the pulley for a continuously variable transmission including the fixed pulley 2 and the movable pulley 3. By forming it, the lifting force W can be secured even if the wedge angle α between the conical surfaces 2a and 3a is small.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

この考案は無段変速機用プーリに関し、詳しくはＶベルト式無段変速機用プーリに関する。 The present invention relates to a pulley for a continuously variable transmission, and more specifically to a pulley for a V-belt type continuously variable transmission.

【０００２】[0002]

【従来の技術】[Prior Art]

従来、Ｖベルト式無段変速機においては、固定プーリと可動プーリとをそれぞれ有する駆動側および従動側プーリが備えられ、これらの間にＶベルトが掛装されている。このような固定プーリ及び可動プーリは炭素鋼もしくは合金鋼により形成されている。 Conventionally, a V-belt type continuously variable transmission is provided with a driving side pulley and a driven side pulley each having a fixed pulley and a movable pulley, and a V belt is hung between them. Such fixed pulleys and movable pulleys are made of carbon steel or alloy steel.

【０００３】[0003]

【考案が解決しようとする課題】[Problems to be solved by the device]

ところで、このようなプーリのＶベルトが掛装される円錐面間の角度（以下くさび角という）は、プーリ幅及びＶベルト幅を小さくするため、より小さな角度であることが望ましいが、円錐面の動摩擦係数を一定とした場合、くさび角を小さくすると、プーリ推力（円錐面からＶベルト側面に加わる力）によりＶベルトに加わる浮き上がり力（Ｖベルトを円錐面の半径方向外側に動かす方向の力）が、小さくなり、浮き上がり力が負になると、Ｖベルトがプーリから離れるときＶベルトがプーリに容易に離れないでプーリに巻き込む現象を生じ、ベルト騒音の増大、Ｖベルトの切断等を生ずる原因となる。上記従来の炭素鋼もしくは合金鋼により形成されたプーリでは円錐面の動摩擦係数は０．３５〜０．４０であり、上記浮き上がり力の関係でくさび角は４０° 以上必要であった。このため、浮き上がり力を負にすることなく、くさび角をさらに小さくできる無段変速機用プーリが希求されていた。 By the way, it is desirable that the angle between the conical surfaces on which the V-belt of such a pulley is mounted (hereinafter referred to as a wedge angle) is smaller in order to reduce the pulley width and the V-belt width. When the dynamic friction coefficient of the surface is constant and the wedge angle is reduced, the lifting force applied to the V-belt by the pulley thrust (the force applied from the conical surface to the V-belt side surface) (the direction that moves the V-belt radially outward of the conical surface). When the V-belt separates from the pulley, the V-belt does not easily separate from the pulley and winds around the pulley, resulting in increased belt noise and disconnection of the V-belt. It becomes a cause. In the above-mentioned conventional pulley made of carbon steel or alloy steel, the dynamic friction coefficient of the conical surface is 0.35 to 0.40, and the wedge angle is required to be 40 ° or more because of the lifting force. For this reason, there has been a demand for a pulley for a continuously variable transmission that can further reduce the wedge angle without making the lifting force negative.

【０００４】[0004]

【課題を解決するための手段】[Means for Solving the Problems]

上記課題を解決するため、本考案の無段変速機用プーリは、固定プーリと可動プーリとからなる無段変速機用プーリであって、前記固定プーリ及び前記可動プーリのＶベルトと接する円錐面に摩擦係数の低い表面処理層を形成して構成される。 In order to solve the above problems, a pulley for a continuously variable transmission according to the present invention is a pulley for a continuously variable transmission including a fixed pulley and a movable pulley, and is in contact with the fixed pulley and the V belt of the movable pulley. It is configured by forming a surface treatment layer with a low friction coefficient on the conical surface.

【０００５】[0005]

【作用】[Action]

本考案の無段変速機用プーリでは、Ｖベルトと接する円錐面の摩擦係数が小さくなるので、プーリ推力によりＶベルトに加わる浮き上がり力を大きくすることができ、円錐面間のくさび角が小さくても浮き上がり力を確保できる。 In the continuously variable transmission pulley of the present invention, the friction coefficient of the conical surface in contact with the V-belt is small, so that the lifting force applied to the V-belt by the pulley thrust can be increased, and the wedge angle between the conical surfaces is small. Even so, the lifting force can be secured.

【０００６】[0006]

【実施例】【Example】

次に本考案の一実施例を添付の図面を参照して説明する。図１は無段変速機の駆動側もしくは従動側プーリを示すもので、プーリ軸１に一体形成された固定プーリ２と、該固定プーリ２に対向配置され、プーリ軸１に沿って軸方向に摺動可能な可動プーリ３とから構成されている。固定プーリ２と可動プーリ３の対向する側には円錐面２ａ及び３ａがそれぞれ形成されており、これらの間にはＶベルト４が両円錐面２ａ及び３ａに当接状態で掛装されている。可動プーリ３は図中上部に示すように、固定プーリ２に隣接してＶベルト４が円錐面２ａ及び３ａの半径方向外端部近傍において当接する第１位置と、図中下部に示すように、固定プーリ２から離れてＶベルト４が円錐面２ａ及び３ａの半径方向内端部近傍で当接する第２位置との間を可動となっている。 Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a drive-side or driven-side pulley of a continuously variable transmission. A fixed pulley 2 integrally formed with a pulley shaft 1 and a fixed pulley 2 arranged so as to face the fixed pulley 2 are arranged in the axial direction along the pulley shaft 1. The movable pulley 3 is slidable. Conical surfaces 2a and 3a are formed on opposite sides of the fixed pulley 2 and the movable pulley 3, respectively, and a V-belt 4 is hung between the conical surfaces 2a and 3a in contact with both conical surfaces 2a and 3a. .. As shown in the upper part of the figure, the movable pulley 3 is adjacent to the fixed pulley 2 in a first position where the V belt 4 abuts in the vicinity of the outer ends of the conical surfaces 2a and 3a in the radial direction, and as shown in the lower part of the figure. In addition, apart from the fixed pulley 2, the V-belt 4 is movable between a second position where the V-belt 4 abuts in the vicinity of the inner ends of the conical surfaces 2a and 3a in the radial direction.

【０００７】また、上記固定プーリ２及び可動プーリ３はいずれも炭素鋼もしくは合金鋼で形成されているが、円錐面２ａ及び３ａの表面には摩擦係数の低い表面処理層５及び６がそれぞれ形成されている。このような表面処理層５及び６は、例えばＰＴＦＥ複合無電解Ｎｉ−Ｐメッキ，ＳｉＣ＋ＢＮ複合無電解Ｎｉ−Ｐメッキ，無電解Ｃｏ−Ｗメッキ等を施すことで形成できる。これらの処理により、表面処理層５及び６の表面の動摩擦係数は０．２前後の値となっている。The fixed pulley 2 and the movable pulley 3 are both made of carbon steel or alloy steel, but the surface treatment layers 5 and 6 having a low friction coefficient are formed on the surfaces of the conical surfaces 2a and 3a, respectively. Has been done. Such surface treatment layers 5 and 6 can be formed, for example, by performing PTFE composite electroless Ni-P plating, SiC + BN composite electroless Ni-P plating, electroless Co-W plating, or the like. By these treatments, the dynamic friction coefficient of the surface of the surface treatment layers 5 and 6 is about 0.2.

【０００８】次に上記実施例の作用に関し説明すると、固定プーリ２及び可動プーリ３の円錐面２ａ及び３ａの表面には摩擦係数の低い表面処理層５及び６がそれぞれ形成され、その動摩擦係数は炭素鋼もしくは合金鋼が直接円錐面２ａ及び３ａを形成する場合の動摩擦係数である０．３５〜０．４０よりも非常に小さくなっている。ここで、先に従来例に関連して説明したように、円錐面２ａ及び３ａのくさび角αが小さくなると、プーリ推力Ｎ（円錐面２ａ及び３ａからＶベルト４の側面に加わる力）によりＶベルト４に加わる浮き上がり力Ｗ（Ｖベルト４を円錐面２ａ及び３ａの半径方向外側に動かす方向の力）が小さくなるが、一方でこのようなプーリ推力Ｎは逆に円錐面２ａ及び３ａの動摩擦係数が小さくなるほど大きくなる。Next, the operation of the above embodiment will be described. The surface treatment layers 5 and 6 having a low friction coefficient are formed on the surfaces of the conical surfaces 2a and 3a of the fixed pulley 2 and the movable pulley 3, respectively, and the dynamic friction coefficient thereof is formed. Is much smaller than the dynamic friction coefficient of 0.35 to 0.40 when carbon steel or alloy steel directly forms the conical surfaces 2a and 3a. Here, as described above in connection with the conventional example, when the wedge angle α of the conical surfaces 2a and 3a becomes smaller, V is caused by the pulley thrust N (force applied from the conical surfaces 2a and 3a to the side surface of the V belt 4). The lifting force W (the force in the direction of moving the V-belt 4 to the outside of the conical surfaces 2a and 3a in the radial direction) applied to the belt 4 becomes small, but on the other hand, such a pulley thrust N conversely occurs on the conical surfaces 2a and 3a. It increases as the coefficient of dynamic friction decreases.

【０００９】従って、従来と同様な浮き上がり力Ｗを生ずる円錐面２ａ及び３ａのくさび角 αは従来のものよりも小さくでき、図示のように最小２６°のくさび角αに設定できる。従って固定プーリ２及び可動プーリ３の幅さらにはＶベルト４の幅を小さくすることができるので、無段変速機をコンパクトに構成できる。また、逆に、同一のくさび角αを有する従来の構造のプーリに比して、Ｖベルト４に加わる浮き上がり力Ｗが大きくなるので、プーリ推力Ｎを小さくでき、従って、Ｖベルト４の寿命が向上する。Therefore, the wedge angles α of the conical surfaces 2a and 3a which generate the lifting force W similar to the conventional one can be made smaller than the conventional one, and can be set to the minimum wedge angle α of 26 ° as shown in the figure. Therefore, the widths of the fixed pulley 2 and the movable pulley 3 as well as the width of the V-belt 4 can be reduced, so that the continuously variable transmission can be made compact. On the contrary, since the lifting force W applied to the V-belt 4 is larger than that of the pulley having the conventional structure having the same wedge angle α, the pulley thrust N can be reduced, and accordingly, the V-belt 4 Lifespan is improved.

【００１０】[0010]

【考案の効果】[Effect of the device]

本考案の無段変速機用プーリでは、円錐面間のくさび角が小さくても浮き上がり力を確保できるので、プーリ幅さらにはＶベルト幅を小さくできるので無段変速機をコンパクトに構成できる利点を有する。また、Ｖベルトの側面に加わるプーリ推力が小さくても十分な浮き上がり力を得ることができるので、Ｖベルトの寿命が向上する利点を有する。 With the pulley for a continuously variable transmission according to the present invention, since the lifting force can be secured even if the wedge angle between the conical surfaces is small, the pulley width as well as the V belt width can be made small so that the continuously variable transmission can be made compact. It has the advantage of being configurable. Further, even if the pulley thrust applied to the side surface of the V-belt is small, a sufficient lifting force can be obtained, which has the advantage of improving the life of the V-belt.

【図面の簡単な説明】[Brief description of drawings]

【図１】本考案の一実施例による無段変速機用プーリを
プーリ軸とともに示した断面図である。FIG. 1 is a cross-sectional view showing a pulley for a continuously variable transmission according to an embodiment of the present invention together with a pulley shaft.

【符号の説明】[Explanation of symbols]

２固定プーリ３可動プーリ２ａ，３ａ円錐面４Ｖベルト５，６表面処理層 2 fixed pulley 3 movable pulley 2a, 3a conical surface 4 V-belt 5, 6 surface treatment layer

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

【請求項１】固定プーリと可動プーリとからなる無段
変速機用プーリであって、前記固定プーリ及び前記可動
プーリのＶベルトと接する円錐面に摩擦係数の低い表面
処理層を形成したことを特徴とする無段変速機用プー
リ。1. A pulley for a continuously variable transmission comprising a fixed pulley and a movable pulley, wherein a surface treatment layer having a low friction coefficient is formed on a conical surface of the fixed pulley and the movable pulley which is in contact with a V belt. Characteristic pulley for continuously variable transmission.