JP3663946B2

JP3663946B2 - Continuously variable transmission pulley

Info

Publication number: JP3663946B2
Application number: JP35055998A
Authority: JP
Inventors: 浩一萱嶋; 誠前原
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 1998-12-09
Filing date: 1998-12-09
Publication date: 2005-06-22
Anticipated expiration: 2018-12-09
Also published as: JP2000170884A

Description

【０００１】
【発明の属する技術分野】
この発明は、ベルト式の無段変速機におけるプーリに関し、特にそのプーリを構成しているシーブと円筒状部材の結合構造に関するものである。
【０００２】
【従来の技術】
ベルト式の無段変速機は、駆動側のプーリと従動側のプーリとの巻き掛け半径を連続的に変化させることにより、変速比を無段階に変更するように構成されている。したがって各プーリは、軸線方向に移動可能な可動シーブと軸線方向に対して固定した固定シーブとによって構成され、これらのシーブの間に形成されるＶ溝にベルトを巻き掛けるようになっている。
【０００３】
この種の無段変速機におけるプライマリープーリの一例を説明すると、図３において、ここに示すプライマリープーリは固定シーブ１と可動シーブ２を備えており、その固定シーブ１の円錐状ベルト接触面１１と可動シーブ２の円錐状ベルト接触面１２との間に形成されたＶ字状のベルト溝１３に無端ベルト１４が巻き掛けられる。
【０００４】
トルクが入出力される軸３が固定シーブ１に一体に形成されており、この軸３に可動シーブ２の軸４が嵌合されている。これらの軸３，４の間には、両者の軸線方向への相対移動を可能にし、かつ回転方向には一体化するボールスプライン１７が設けられている。
【０００５】
可動シーブ２は油圧によって軸線方向に移動するように構成されており、そのために可動シーブ２の背面側の外周部に、シリンダ５の円筒状の端部がかしめ結合されている。また、このシリンダ５の円筒状内周面に固定ピストン６の外周側の端部がシール材７を介して液密状態に摺動自在に嵌合し、そのピストン６の内周側の端部が前記軸３の外周面に液密状態で嵌合固定されている。したがって、可動シーブ２の背面と軸４の外周面とシリンダ５の内周面と軸３の外周面とによって油室８が区画形成されている。さらに、可動シーブ２の背面とピストン６の内面との間にコイルスプリング９が圧縮状態で配置され、このコイルスプリング９の弾発力によって可動シーブ２が固定シーブ１側に押されている。
【０００６】
前記油室８に対して圧油を給排するための油路１８，１９および油路１５，１６が、軸３および軸４を貫通して形成されており、これらの油路１８，１９，１５，１６を介して油室８に油圧を加えることにより可動シーブ２が固定シーブ１側に移動してベルト溝１３の幅が減少してベルト１４の巻き掛け半径が増大し、また反対にこれらの油路１８，１９，１５，１６を介して油室８から排圧することにより、ベルト１４の張力によって可動シーブ２が固定シーブ１から離れる方向に押され、その結果、ベルト溝１３の幅が増大してベルト１４の巻き掛け半径が減少するように構成されている。なお、油室８に対する油圧の給排は、アクセル開度や走行状態に基づいた変速信号によって制御される。
【０００７】
このように可動シーブ２には、その背面側に油圧を作用させるためにシリンダ５が一体化されている。これら可動シーブ２とシリンダ５との結合構造として、従来、かしめ構造が採用されており、その一例が特開平９−３２９２０８号公報に記載されている。この公報に記載された構造は、かしめに伴う軸線方向力によってシーブにおけるベルト接触面を正規の形状とするための構造であり、具体的には、図４に示すように、可動シーブ２の背面２５に突設された円筒状嵌合部２０の外周面２１の基部に凹溝２２を形成し、可動シーブ２の背面２５にシリンダ５の軸に直角で平坦な先端面２３を当接させた状態でこの円筒状先端部の外周面をかしめローラ３０の円筒状押圧面により半径方向で内側に押圧して凹溝２２内にかしめることによって結合する。そして、シリンダ５の先端部を凹溝２２にかしめて圧入する際に、シリンダ５および可動シーブ２に軸線方向に荷重が作用し、その軸線方向力によって可動シーブ２をベルト接触面側に変形させ、所期の形状とする。
【０００８】
【発明が解決しようとする課題】
上述した従来の構造では、図４から明らかなように、可動シーブ２とシリンダ５とが軸線方向に向けて係合した構造となっている。しかしながら油室８の内部に供給した圧油による圧力は全ての面に均等に作用するので、シリンダ５が膨張しようとする。上記従来の構造では、このシリンダ５の膨張方向に対して可動シーブ２とシリンダ５とを積極的に係合させる部分がなく、そのため、油室８内に供給される油圧が高くなると、可動シーブ２とシリンダ５とを結合しているかしめ部に緩みが生じ、ここから圧油が漏洩したり、シリンダ５が可動シーブ２から外れたりするおそれがあった。
【０００９】
この発明は、上記の事情を背景にしてなされたものであり、シーブとこれに一体化される円筒状部材のかしめ構造による結合を確実かつ強固なものとすることのできるプーリを提供することを目的とするものである。
【００１０】
【課題を解決するための手段およびその作用】
請求項１の発明は、上記の目的を達成するために、ベルトが巻き掛けられるシーブの背面に軸線方向に突設された円筒状嵌合部における外周面の基部に凹溝を形成し、その円筒状嵌合部に嵌合させた円筒状部材の先端部を前記シーブの背面に当接させた状態でこの円筒状部材の先端部を前記凹溝にかしめることによってシーブと円筒状部材とを結合してなり、前記シーブの背面と前記円筒状部材の内周面とが、シーブを軸線方向に移動するための油室を区画形成している無段変速機のプーリにおいて、前記シーブの背面に前記凹溝に近接して前記円筒状部材のかしめ時にその肉が流れ込む軸線方向に窪んだ横溝が形成されているとともに、前記横溝の内径が、前記円筒状嵌合部の外径より大きく設定されていることを特徴とするものである。
また、請求項２の発明は、ベルトが巻き掛けられるシーブの背面に軸線方向に突設された円筒状嵌合部における外周面の基部に凹溝を形成し、その円筒状嵌合部に嵌合させた円筒状部材の先端部を前記シーブの背面に当接させた状態でこの円筒状部材の先端部を前記凹溝にかしめることによってシーブと円筒状部材とを結合してなる無段変速機のプーリにおいて、前記シーブの背面に前記凹溝に近接して前記円筒状部材のかしめ時にその肉が流れ込む軸線方向に窪んだ横溝が形成され、かつ前記横溝の外径が、かしめ部分の外径より小さく設定されているとともに、前記横溝の内径が、前記円筒状嵌合部の外径より大きく設定されていることを特徴とするものである。
さらに、請求項３の発明は、ベルトが巻き掛けられるシーブの背面に軸線方向に突設された円筒状嵌合部における外周面の基部に凹溝を形成し、その円筒状嵌合部に嵌合させた円筒状部材の先端部を前記シーブの背面に当接させた状態でこの円筒状部材の先端部を前記凹溝にかしめることによってシーブと円筒状部材とを結合してなる無段変速機のプーリにおいて、前記シーブの背面に前記凹溝に近接して前記円筒状部材のかしめ時にその肉が流れ込む軸線方向に窪んだ横溝が形成され、かつ前記横溝の内径が、前記円筒状嵌合部の外径より大きく設定されていることを特徴とするものである。
またさらに、請求項４の発明は、請求項１における前記横溝の外径が、かしめ部分の外径より小さく設定されていることを特徴とする無段変速機のプーリである。
【００１１】
したがってこの発明によれば、かしめ加工によって変形した円筒状部材の先端部の肉が前記凹溝と横溝とに入り込み、これらの溝を介して円筒状部材とシーブとが係合する。その凹溝は、前記円筒状嵌合部の外周面に形成されたものであるから、この凹溝によって円筒状部材とシーブとが軸線方向に対して一体化するように係合した状態になり、これに対して横溝は、軸線方向に向けて形成したものであるから、この横溝によって円筒状部材とシーブとが半径方向に対して一体化するように係合した状態になる。そのため、軸線方向および半径方向のいずれの方向に荷重がかかっても、円筒状部材とシーブとのかしめ加工による結合部分でゆるみが生じることがなく、円筒状部材とシーブとが確実かつ強固に結合される。特に、円筒状部材の内周面が油室の一部を形成している場合には、横溝に入っている肉が油室内の油圧に応じて横溝の外周側の内壁に押圧されるので、この部分でのシール性が向上する。また、横溝の外径がかしめ部分の外径より小さく設定されていれば、円筒状部材の端部を横溝に差し込んだ状態ではなく膨出した肉を横溝に圧入した状態となるので、嵌合強度が高くなる。さらに、横溝の内径を前記円筒状嵌合部の外径より大きく設定すれば、凹溝に流れ込んだ肉の一部ではなくこれとは別の肉が横溝に流入した状態になるので、その肉が横溝に対して強固に密着し、その結合強度が高くなる。
【００１２】
【発明の実施の形態】
つぎにこの発明の具体例を図に基づいて説明する。図１は、前述した図３に示す可動シーブ２と円筒状部材であるシリンダ５とをかしめ加工によって結合一体化したプーリにこの発明を適用した例を示しており、その可動シーブ２の背面２５に軸線方向に突出させて形成された円筒状嵌合部２０の基部すなわち可動シーブ２の背面２５と円筒状嵌合部２０の外周面２１との交差部には、従来と同様に凹溝２２が形成されている。これに加えて、可動シーブ２の背面２５には、軸線方向に窪んだ横溝４０が形成されている。この横溝４０は、可動シーブ２の円周方向の全体に連続した環状溝であってもよく、あるいは前記背面２５の一部に円周方向に向けて形成されたものであってもよい。また、この横溝４０の位置は、円筒状嵌合部２０の外周面２１より僅か外周側である。
【００１３】
そして、シリンダ５が円筒状嵌合部２０の外周側に嵌合させられるとともに、その先端面が可動シーブ２の背面２５に当接され、その状態でシリンダ５の先端部を、その外周側からかしめローラ３０により半径方向で内側に加圧され、かしめ結合により可動シーブ２とシリンダ５とが連結一体化されている。すなわちかしめ加工に伴う材料流動が凹溝２２と横溝４０とに向けて生じ、シリンダ５の先端部の肉がこれらの溝２２，４０に入り込んで係合した状態となり、これをもって可動シーブ２とシリンダ５とが結合されている。
【００１４】
ここで、横溝４０の各部の寸法について図２を参照して説明すると、横溝４０の外径Ｄo は、かしめ部分の外径すなわちかしめ深さの径Ｗo より僅か小さく設定され、また、内径Ｄi は円筒状嵌合部２０の外径（シリンダ５の内径）Ｗi より僅か大きく設定されている。これは、シリンダ５の横溝４０対する嵌合強度を高くするためである。すなわち、横溝４０の外径Ｄo がかしめ部分の外径Ｗo より小さいことにより、シリンダ５の先端部を横溝４０に差し込んだ状態ではなく膨出した肉を横溝４０に圧入した状態となり、また、内径Ｄi が円筒状嵌合部２０の外径Ｗi より大きいことにより、凹溝２２に流れ込んだ肉の一部が横溝４０に流入した状態ではなくこれとは別の肉が横溝４０に流入した状態になる。そのため、横溝４０においても、凹溝２２におけると同様に、流入した肉が横溝４０の内面に強固に密着し、その結合強度が高くなる。
【００１５】
なお、他の構成は図３および図４に示す従来のものと同様であり、対応する部材には同じ符号を付してその説明を省略する。
【００１６】
図１に示す構成のプーリにおいても、可動シーブ２の背面側に形成されている油室８に圧油が供給されその内部圧力が高くなる。その結果、シリンダ５にはその外径を増大させる方向に荷重が作用するが、その先端部の肉が横溝４０に入り込んでいて半径方向に対しても係合している状態になっているので、可動シーブ２に対する結合部分における半径方向で外側への変形が阻止され、かしめ部すなわちシリンダ５の先端部が可動シーブ２から外れることはない。また、横溝４０内に入っている肉が油室８内の油圧に応じて横溝４０の外周側の内壁に押圧されるので、この部分でのシール性が向上し、したがって、油室８内の圧油がかしめ部から漏洩することを防止できる。
【００１７】
一方、かしめローラ３０によってシリンダ５の先端部を半径方向で内側にかしめる場合、材料流動が半径方向のみならず軸線方向にも生じるが、図１に示す構成では、横溝４０を形成してあることにより、軸線方向への材料流動が部分的であっても可能になり、そのため、かしめ加工に伴ってシリンダ５に作用する軸線方向の荷重が小さくなる。その結果、シリンダ５の軸方向長さ、円筒度、真円度に対する悪影響を軽減できるとともにかしめローラ３０が受ける横力が少なくなるので、かしめローラ３０の軸受の損傷を防止してその寿命を延長することができる。
【００１８】
なお、上述した例では、ベルト式無段変速機におけるプライマリープーリを例に採って説明したが、この発明はセカンダリープーリにも適用でき、要は、シーブの背面側にシリンダなどの円筒状部材を軸線方向に延ばして連結した構造のプーリ、特にその円筒状部材の内部の圧力を高くする構成のプーリに適用することができる。
【００１９】
【発明の効果】
以上説明したように、この発明によれば、シーブの背面側で円筒状部材をかしめ加工によって結合する部分に、円筒状部材の肉を流入させる溝として、半径方向で内側に窪んだ凹溝と軸線方向に向けて窪んだ横溝とを形成したので、円筒状部材を軸線方向に対してのみならず半径方向に対してもシーブに係合させることが可能になり、その結果、円筒状部材の内部に流体圧を加えても、円筒状部材の膨張によりかしめ部が外れたり、流体圧の漏洩が生じたりすることがなく、シーブと円筒状部材とを確実かつ強固に連結することができる。特に、円筒状部材の内部の圧力が高くなることにより、横溝における外周側の内壁に円筒状部材の肉がより強く押し付けられるので、この部分でのシール性が向上する。また、横溝の外径がかしめ部分の外径より小さく設定されていれば、円筒状部材の端部を横溝に差し込んだ状態ではなく膨出した肉を横溝に圧入した状態となるので、嵌合強度が高くなる。さらに、横溝の内径を前記円筒状嵌合部の外径より大きく設定すれば、凹溝に流れ込んだ肉の一部ではなくこれとは別の肉が横溝に流入した状態になるので、その肉が横溝に対して強固に密着し、その結合強度が高くなる。
【００２０】
また、かしめ加工時における軸線方向への肉の流動を横溝によって許容することになるので、かしめ加工時に円筒状部材に作用する軸線方向の応力が小さくなり、その結果、円筒状部材の軸方向長さ、円筒度、真円度に対する悪影響を軽減できる。同時に、かしめローラが受ける横力が少なくなるので、かしめローラの軸受の損傷を防止してその寿命を延長することができる。
【図面の簡単な説明】
【図１】この発明の一具体例を示す部分的拡大断面図である。
【図２】その横溝の各寸法を説明するための説明図である。
【図３】従来の無段変速機のプーリを示す縦断面図である。
【図４】従来の可動シーブとシリンダとのかしめ構造を示す部分的拡大断面図である。
【符号の説明】
２…可動シーブ、２５…背面、５…シリンダ、２３…内端、２０…フランジ、２１…外周面、２２…凹溝、３０…かしめローラ、４０…横溝。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulley in a belt type continuously variable transmission, and more particularly to a coupling structure of a sheave and a cylindrical member constituting the pulley.
[0002]
[Prior art]
The belt-type continuously variable transmission is configured to continuously change the gear ratio by continuously changing the wrapping radius between the driving pulley and the driven pulley. Accordingly, each pulley is constituted by a movable sheave movable in the axial direction and a fixed sheave fixed in the axial direction, and a belt is wound around a V groove formed between the sheaves.
[0003]
An example of a primary pulley in this type of continuously variable transmission will be described. In FIG. 3, the primary pulley shown here includes a fixed sheave 1 and a movable sheave 2, and a conical belt contact surface 11 of the fixed sheave 1 An endless belt 14 is wound around a V-shaped belt groove 13 formed between the movable sheave 2 and the conical belt contact surface 12.
[0004]
A shaft 3 through which torque is input and output is formed integrally with the fixed sheave 1, and the shaft 4 of the movable sheave 2 is fitted to the shaft 3. Between these shafts 3 and 4, there is provided a ball spline 17 that enables relative movement in the axial direction of the both and is integrated in the rotational direction.
[0005]
The movable sheave 2 is configured to move in the axial direction by hydraulic pressure. For this purpose, the cylindrical end portion of the cylinder 5 is caulked and coupled to the outer peripheral portion on the back side of the movable sheave 2. Further, an end portion on the outer peripheral side of the fixed piston 6 is slidably fitted in a liquid-tight state via a seal material 7 on the cylindrical inner peripheral surface of the cylinder 5, and an end portion on the inner peripheral side of the piston 6 Is fixed to the outer peripheral surface of the shaft 3 in a liquid-tight state. Therefore, the oil chamber 8 is defined by the back surface of the movable sheave 2, the outer peripheral surface of the shaft 4, the inner peripheral surface of the cylinder 5 , and the outer peripheral surface of the shaft 3. Further, a coil spring 9 is disposed in a compressed state between the back surface of the movable sheave 2 and the inner surface of the piston 6, and the movable sheave 2 is pushed toward the fixed sheave 1 by the elastic force of the coil spring 9.
[0006]
Oil passages 18 and 19 and oil passages 15 and 16 for supplying and discharging pressure oil to and from the oil chamber 8 are formed through the shaft 3 and the shaft 4, and these oil passages 18, 19, By applying hydraulic pressure to the oil chamber 8 through 15 and 16, the movable sheave 2 moves to the fixed sheave 1 side, the width of the belt groove 13 decreases, the wrapping radius of the belt 14 increases, and conversely Is discharged from the oil chamber 8 through the oil passages 18, 19, 15, and 16, so that the movable sheave 2 is pushed away from the fixed sheave 1 by the tension of the belt 14, and as a result, the width of the belt groove 13 is reduced. The wrapping radius of the belt 14 is increased and decreased. The supply / discharge of the hydraulic pressure to / from the oil chamber 8 is controlled by a shift signal based on the accelerator opening and the running state.
[0007]
Thus, the cylinder 5 is integrated with the movable sheave 2 in order to apply hydraulic pressure to the back side thereof. As a coupling structure between the movable sheave 2 and the cylinder 5, a caulking structure has been conventionally employed, and an example thereof is described in Japanese Patent Laid-Open No. 9-329208. The structure described in this publication is a structure for making the belt contact surface of the sheave a regular shape by the axial force accompanying caulking. Specifically, as shown in FIG. A concave groove 22 is formed at the base of the outer peripheral surface 21 of the cylindrical fitting portion 20 projecting from 25, and a flat front end surface 23 perpendicular to the axis of the cylinder 5 is brought into contact with the back surface 25 of the movable sheave 2. In this state, the outer peripheral surface of the cylindrical tip is pressed inward in the radial direction by the cylindrical pressing surface of the caulking roller 30 to be caulked in the concave groove 22. When the tip of the cylinder 5 is caulked and press-fitted into the concave groove 22, a load is applied to the cylinder 5 and the movable sheave 2 in the axial direction, and the movable sheave 2 is deformed to the belt contact surface side by the axial force. The desired shape.
[0008]
[Problems to be solved by the invention]
In the conventional structure described above, as is apparent from FIG. 4, the movable sheave 2 and the cylinder 5 are engaged in the axial direction. However, since the pressure by the pressure oil supplied to the inside of the oil chamber 8 acts equally on all surfaces, the cylinder 5 tends to expand. In the above-described conventional structure, there is no portion that positively engages the movable sheave 2 and the cylinder 5 with respect to the expansion direction of the cylinder 5, so that when the hydraulic pressure supplied into the oil chamber 8 increases, 2 and the cylinder 5 are loosened at the caulking portion, and pressure oil may leak from the caulked portion or the cylinder 5 may come off the movable sheave 2.
[0009]
The present invention has been made in the background of the above circumstances, and provides a pulley capable of surely and firmly coupling a sheave and a cylindrical member integrated with the sheave by a caulking structure. It is the purpose.
[0010]
[Means for Solving the Problem and Action]
In order to achieve the above object, the invention of claim 1 forms a concave groove in the base of the outer peripheral surface of the cylindrical fitting portion protruding in the axial direction on the back surface of the sheave around which the belt is wound. A sheave, a cylindrical member, and a cylindrical member are formed by caulking the distal end portion of the cylindrical member into the concave groove in a state where the distal end portion of the cylindrical member fitted into the cylindrical fitting portion is in contact with the back surface of the sheave. In the pulley of the continuously variable transmission, the back surface of the sheave and the inner peripheral surface of the cylindrical member define an oil chamber for moving the sheave in the axial direction. back said is recessed transverse groove formed adjacent to the groove in the axial direction in which the meat flows during crimping of the cylindrical member in Rutotomoni, the inner diameter of the transverse grooves is greater than the outer diameter of the cylindrical fitting portion that it has set those characterized.
In the invention of claim 2, a concave groove is formed in the base portion of the outer peripheral surface of the cylindrical fitting portion projecting in the axial direction on the back surface of the sheave around which the belt is wound, and fitted into the cylindrical fitting portion. Steplessly formed by joining the sheave and the cylindrical member by caulking the tip of the cylindrical member into the concave groove with the tip of the combined cylindrical member in contact with the back of the sheave In the pulley of the transmission, a lateral groove that is depressed in the axial direction is formed on the back surface of the sheave in the vicinity of the concave groove so that the flesh flows when the cylindrical member is caulked, and the outer diameter of the lateral groove is equal to that of the caulking portion. Rutotomoni is set smaller than the outer diameter, the inner diameter of the lateral grooves, and is characterized in that you have been set larger than the outer diameter of the cylindrical fitting portion.
Furthermore, in the invention of claim 3, a concave groove is formed in the base portion of the outer peripheral surface of the cylindrical fitting portion projecting in the axial direction on the back surface of the sheave around which the belt is wound, and is fitted into the cylindrical fitting portion. Steplessly formed by joining the sheave and the cylindrical member by caulking the tip of the cylindrical member into the concave groove with the tip of the combined cylindrical member in contact with the back of the sheave In the pulley of the transmission, a lateral groove that is depressed in the axial direction is formed on the back surface of the sheave in the vicinity of the concave groove so that the flesh flows when the cylindrical member is caulked, and the inner diameter of the horizontal groove is the cylindrical fitting. It is characterized by being set larger than the outer diameter of the joint.
Further, the invention of claim 4 is the pulley of the continuously variable transmission, wherein the outer diameter of the lateral groove in claim 1 is set smaller than the outer diameter of the caulking portion .
[0011]
Therefore, according to the present invention, the flesh of the tip end portion of the cylindrical member deformed by the caulking process enters the concave groove and the lateral groove, and the cylindrical member and the sheave are engaged through these grooves. Since the concave groove is formed on the outer peripheral surface of the cylindrical fitting portion, the cylindrical member and the sheave are engaged with each other so as to be integrated in the axial direction by the concave groove. On the other hand, since the lateral groove is formed in the axial direction, the cylindrical member and the sheave are engaged by the lateral groove so as to be integrated in the radial direction. Therefore, even if a load is applied in either the axial direction or the radial direction, the cylindrical member and the sheave are securely joined firmly without any loosening caused by caulking between the cylindrical member and the sheave. Is done. In particular, when the inner peripheral surface of the cylindrical member forms part of the oil chamber, the meat in the lateral groove is pressed against the inner wall on the outer peripheral side of the lateral groove according to the hydraulic pressure in the oil chamber, The sealing performance at this portion is improved. If the outer diameter of the lateral groove is set smaller than the outer diameter of the caulking portion, the end of the cylindrical member is not inserted into the lateral groove, but the bulged meat is pressed into the lateral groove. Strength increases. Furthermore, if the inner diameter of the lateral groove is set to be larger than the outer diameter of the cylindrical fitting portion, not a part of the meat that has flowed into the concave groove but another meat flows into the lateral groove. Firmly adheres to the lateral grooves, and the bond strength is increased.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific examples of the present invention will be described with reference to the drawings. FIG. 1 shows an example in which the present invention is applied to a pulley in which the movable sheave 2 shown in FIG. 3 and the cylinder 5 which is a cylindrical member are coupled and integrated by caulking, and the back surface 25 of the movable sheave 2 is shown. In the same manner as in the prior art, a concave groove 22 is formed at the base portion of the cylindrical fitting portion 20 formed so as to protrude in the axial direction, that is, at the intersection of the back surface 25 of the movable sheave 2 and the outer peripheral surface 21 of the cylindrical fitting portion 20. Is formed. In addition, a lateral groove 40 that is recessed in the axial direction is formed on the back surface 25 of the movable sheave 2. The lateral groove 40 may be an annular groove that is continuous in the entire circumferential direction of the movable sheave 2, or may be formed in a part of the back surface 25 in the circumferential direction. Further, the position of the lateral groove 40 is slightly on the outer peripheral side with respect to the outer peripheral surface 21 of the cylindrical fitting portion 20.
[0013]
Then, the cylinder 5 is fitted to the outer peripheral side of the cylindrical fitting portion 20, and its front end surface is brought into contact with the back surface 25 of the movable sheave 2. In this state, the front end portion of the cylinder 5 is moved from the outer peripheral side. The movable sheave 2 and the cylinder 5 are connected and integrated by caulking and being pressed inward in the radial direction by the caulking roller 30. That is, the material flow accompanying the caulking process is generated toward the concave groove 22 and the lateral groove 40, and the end portion of the cylinder 5 enters and engages with the grooves 22, 40. 5 is connected.
[0014]
Here, the dimensions of each part of the lateral groove 40 will be described with reference to FIG. 2. The outer diameter Do of the lateral groove 40 is set slightly smaller than the outer diameter of the caulking portion, that is, the caulking depth diameter Wo, and the inner diameter Di is The outer diameter of the cylindrical fitting portion 20 (the inner diameter of the cylinder 5) Wi is set slightly larger. This is to increase the fitting strength of the cylinder 5 with respect to the lateral groove 40. That is, since the outer diameter Do of the lateral groove 40 is smaller than the outer diameter Wo of the caulking portion, the bulged meat is pressed into the lateral groove 40 instead of being inserted into the lateral groove 40 and the inner diameter is increased. by and Di is Okiiko Ri by the outer diameter Wi of the cylindrical fitting portion 20, a part of the meat that has flowed into the grooves 22 is different meat flows into the lateral groove 40 from this not a state that has flowed into the transverse groove 40 It becomes a state. Therefore, also in the horizontal groove 40, as in the concave groove 22, the inflowed meat is firmly adhered to the inner surface of the horizontal groove 40, and the coupling strength is increased.
[0015]
Other configurations are the same as those of the conventional one shown in FIGS. 3 and 4, and the corresponding members are denoted by the same reference numerals and the description thereof is omitted.
[0016]
Also in the pulley having the configuration shown in FIG. 1, the pressure oil is supplied to the oil chamber 8 formed on the back side of the movable sheave 2 and the internal pressure thereof is increased. As a result, a load is applied to the cylinder 5 in the direction of increasing the outer diameter, but the flesh at the tip of the cylinder 5 enters the lateral groove 40 and is engaged in the radial direction. Further, the outward deformation in the radial direction at the connecting portion with respect to the movable sheave 2 is prevented, and the caulking portion, that is, the tip portion of the cylinder 5 does not come off from the movable sheave 2. Further, since the meat contained in the lateral groove 40 is pressed against the inner wall on the outer peripheral side of the lateral groove 40 in accordance with the hydraulic pressure in the oil chamber 8, the sealing performance at this portion is improved, and therefore the inside of the oil chamber 8 is improved. It is possible to prevent pressure oil from leaking from the caulking portion.
[0017]
On the other hand, when the tip of the cylinder 5 is caulked inward in the radial direction by the caulking roller 30, the material flow occurs not only in the radial direction but also in the axial direction. However, in the configuration shown in FIG. Thus, even if the material flow in the axial direction is partial, it is possible to reduce the axial load acting on the cylinder 5 due to caulking. As a result, the adverse effects on the axial length, cylindricity, and roundness of the cylinder 5 can be reduced, and the lateral force applied to the caulking roller 30 is reduced, thereby preventing the bearing of the caulking roller 30 from being damaged and extending its life. can do.
[0018]
In the above example, the primary pulley in the belt type continuously variable transmission has been described as an example. However, the present invention can also be applied to a secondary pulley. In short, a cylindrical member such as a cylinder is provided on the back side of the sheave. The present invention can be applied to a pulley having a structure of extending and connecting in the axial direction, in particular, a pulley configured to increase the pressure inside the cylindrical member.
[0019]
【The invention's effect】
As described above, according to the present invention, as a groove for allowing the cylindrical member to flow into the portion where the cylindrical member is joined by caulking on the back side of the sheave, the concave groove recessed inward in the radial direction and Since the lateral groove that is recessed in the axial direction is formed, the cylindrical member can be engaged with the sheave not only in the axial direction but also in the radial direction. As a result, the cylindrical member Even if fluid pressure is applied to the inside, the sheave and the cylindrical member can be securely and firmly connected without causing the caulking portion to come off due to the expansion of the cylindrical member or the leakage of fluid pressure. In particular, when the pressure inside the cylindrical member is increased, the thickness of the cylindrical member is more strongly pressed against the inner wall on the outer peripheral side of the lateral groove, so that the sealing performance at this portion is improved . If the outer diameter of the lateral groove is set smaller than the outer diameter of the caulking portion, the end of the cylindrical member is not inserted into the lateral groove, but the bulged meat is pressed into the lateral groove. Strength increases. Furthermore, if the inner diameter of the lateral groove is set to be larger than the outer diameter of the cylindrical fitting portion, not a part of the meat that has flowed into the concave groove but another meat flows into the lateral groove. Firmly adheres to the lateral grooves, and the bond strength is increased.
[0020]
In addition, since the flow of meat in the axial direction during caulking is allowed by the lateral groove, the axial stress acting on the cylindrical member during caulking is reduced, and as a result, the axial length of the cylindrical member is reduced. In addition, adverse effects on cylindricity and roundness can be reduced. At the same time, since the lateral force received by the caulking roller is reduced, the bearing of the caulking roller can be prevented from being damaged and its life can be extended.
[Brief description of the drawings]
FIG. 1 is a partially enlarged sectional view showing a specific example of the present invention.
FIG. 2 is an explanatory diagram for explaining each dimension of the lateral groove.
FIG. 3 is a longitudinal sectional view showing a pulley of a conventional continuously variable transmission.
FIG. 4 is a partially enlarged sectional view showing a conventional caulking structure between a movable sheave and a cylinder.
[Explanation of symbols]
2 ... movable sheave 25 ... back surface 5 ... cylinder 23 ... inner end 20 ... flange 21 ... outer peripheral surface 22 ... concave groove 30 ... caulking roller 40 ... lateral groove

Claims

A tip of a cylindrical member formed by forming a concave groove in the base portion of the outer peripheral surface of the cylindrical fitting portion projecting in the axial direction on the back surface of the sheave around which the belt is wound, and fitted into the cylindrical fitting portion The sheave and the cylindrical member are joined by caulking the tip of the cylindrical member in the concave groove in a state in which the sheave is in contact with the back surface of the sheave. In the pulley of the continuously variable transmission in which the inner peripheral surface defines an oil chamber for moving the sheave in the axial direction,
The sheave back to the proximate the groove lateral grooves recessed in the axial direction in which the meat flows during crimping of the cylindrical member is formed Rutotomoni,
The inner diameter of the lateral groove is set larger than the outer diameter of the cylindrical fitting portion.
Pulley of the continuously variable transmission according to claim.

A tip of a cylindrical member formed by forming a concave groove in the base portion of the outer peripheral surface of the cylindrical fitting portion projecting in the axial direction on the back surface of the sheave around which the belt is wound, and fitted into the cylindrical fitting portion In a pulley of a continuously variable transmission in which the sheave and the cylindrical member are coupled by caulking the tip of the cylindrical member in the concave groove in a state where the sheave is in contact with the back surface of the sheave, in proximity to the groove on the rear transverse groove recessed in the axial direction in which the meat flows during crimping of the cylindrical member is formed, and an outer diameter of the lateral grooves, is set smaller than the outer diameter of the caulked portion Rutotomoni ,
The inner diameter of the lateral groove is set larger than the outer diameter of the cylindrical fitting portion.
Pulley of the continuously variable transmission according to claim.

The tip of the cylindrical member that is formed in the base of the outer peripheral surface of the cylindrical fitting portion that protrudes in the axial direction on the back surface of the sheave around which the belt is wound, and is fitted to the cylindrical fitting portion In a pulley of a continuously variable transmission in which the sheave and the cylindrical member are coupled by caulking the tip of the cylindrical member with the concave groove in a state where the sheave is in contact with the back surface of the sheave, A lateral groove that is recessed in the axial direction is formed on the back surface near the concave groove and the meat flows when the cylindrical member is caulked, and the inner diameter of the lateral groove is set larger than the outer diameter of the cylindrical fitting portion. A continuously variable transmission pulley.

The pulley of the continuously variable transmission according to claim 1, wherein an outer diameter of the lateral groove is set smaller than an outer diameter of the caulking portion.