JPS61270549A - Automatic v-belt transmission - Google Patents

Abstract

PURPOSE:To enable smooth control of movable half pulley by providing a vent communicating between a variable ratio liquid pressure chamber encapsulating fluid material and the outside thereby preventing fluctuation of air pressure. CONSTITUTION:The speed is changed by varying the gap between V-shaped annular grooves 27, 49 of drive and driven side V-pulleys 21, 39. The variable ratio liquid pressure chamber 30 is communicated through a path 35 and a vent 36 with the outside to prevent fluctuation of air pressure. Upon stoppage of rotation of drive shaft 20, the flange 33a of pulley guide stroke pin 33 and the end section 34a of guide section 34 will contact. Consequently, the air pressure in the liquid pressure chamber 30 will never fluctuate resulting in smooth control of movable half pulley 23.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、自動二輪車等に用いられるＶベルト伝動式自
動変速機に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a V-belt transmission type automatic transmission used in motorcycles and the like.

〔従来の技術〕[Conventional technology]

このＶベルト伝動式自動変速機は、駆動側のＶプーリと
従動側のＶブーりとにＶベルト・を張架し、それぞれの
ＶプーリのＶ字形環状溝のＶ溝対向面にＶベルトの両側
Ｖ形傾斜面を摩擦係合させて駆動側の回転を従動側に伝
達し、ＶプーリのＶ字形環状溝の間隔を変更することに
より、それぞれのＶプーリに対するＶベルトの有効巻掛
径を変えて無段変速を行う。In this V-belt transmission type automatic transmission, a V-belt is stretched between a V-pulley on the driving side and a V-boot on the driven side, and the V-belt is attached to the V-shaped annular groove of each V-pulley on the opposite surface of the V-groove. By frictionally engaging the V-shaped inclined surfaces on both sides to transmit the rotation of the driving side to the driven side, and by changing the interval between the V-shaped annular grooves of the V-pulleys, the effective winding diameter of the V-belt on each V-pulley can be adjusted. to achieve continuously variable speed.

この変速手段として、特開昭５９−５４８４９号公報に
示されるように、駆動軸の回転に伴ってウェイトローラ
に働く遠心力により駆動側■ブ−リのＶ字形環状渦の間
隔を変更するつＪ−イト［コーラガバナ機構を用いたも
のがあり、これを第１図に基づいて説明すると、駆動軸
１に設りた固定プーリ半体２ど可動プーリ半体３とから
なる駆動側■プーリ４と、従動軸５に設りた固定ブーり
半休６ど可動プーリ半体７どからなる従動側Ｖプーリ８
とにＶベル１−〇を張架し、駆動軸１の回転をＶベルト
９を介して従動軸５に伝達している。As shown in Japanese Unexamined Patent Publication No. 59-54849, this speed change means changes the interval between the V-shaped annular vortices of the drive side boule by centrifugal force acting on the weight roller as the drive shaft rotates. J-ite [There is a model using a collage governor mechanism, and this will be explained based on Fig. 1.The drive side consists of a fixed pulley half 2 and a movable pulley half 3 provided on the drive shaft 1.Pulley 4 and a driven side V-pulley 8, which is made up of a fixed bobber half 6 and a movable pulley half 7, which are installed on the driven shaft 5.
A V-belt 1-0 is stretched between the two, and the rotation of the drive shaft 1 is transmitted to the driven shaft 5 via the V-belt 9.

そして、駆動側■プーリ４の可動ブーり半体３の背面に
設けたランププレート１０と可動プーリ半体３との間に
ウェイ１〜ローラ１１を介装し、駆動軸１０回転による
遠心力でウェイトローラ１１を■プーリ４の半径方向外
方あるいは内方に移動させて、可動プーリ半体３を駆動
軸１の軸方向に移動さゼてＶプーリ４のＶ字形環状溝１
２の間隔＝　３− を可変し、これに伴って従動側Ｖプーリ８のＶ字形環状
溝１３の間隔を可変して、■ベル１−９の両Ｖプーリ４
及び８に対する有効巻掛径を変えて変速を行っている。Drive side ■ Way 1 to roller 11 are interposed between the ramp plate 10 provided on the back side of the movable pulley half 3 of the pulley 4 and the movable pulley half 3, and the centrifugal force generated by the 10 rotations of the drive shaft By moving the weight roller 11 radially outward or inward of the pulley 4, the movable pulley half 3 is moved in the axial direction of the drive shaft 1, and the V-shaped annular groove 1 of the V-pulley 4 is moved.
2 = 3- is varied, and accordingly, the interval between the V-shaped annular grooves 13 of the driven side V-pulley 8 is varied, and ■ Both V-pulleys 4 of the bell 1-9
and 8, the effective winding diameter is changed to change the speed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上記の構造の場合、伝達動力に応じてウェイト［１−ラ
重聞及びウェイトローラ接触面角を設定づ−るので、伝
達動ツノが大きい場合に、ウェイトローラの重量を重く
するとこれに伴って可動プーリ半休及びランププレー１
・が大型化し、また、ウェイトローラの移動による摩耗
劣化の問題がある。In the case of the above structure, the weight [1-La overlap and the weight roller contact surface angle are set according to the transmitted power, so if the transmitted motion horn is large and the weight roller is increased, the weight of the weight roller will be increased accordingly. Movable pulley half-rest and ramp play 1
・There is a problem of increased size and wear and deterioration due to the movement of the weight roller.

そこで、本発明はウェイトローラを使用せずに軒吊、コ
ンバク１〜で伝達動力の大きなＶペル１〜伝動式自動変
速機を提供することを目的としている。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a V-Pel 1 transmission type automatic transmission that can transmit a large power in an eave-hung and compact transmission without using weight rollers.

〔問題点を解決するための手段〕[Means for solving problems]

上記目的を達成するため本発明は、駆動軸に固定ブーり
半体と可動プーリ半体とを設【プ、両プーリ半体間に形
成されるＶ字形環状渦の間隔を遠心力により可変するＶ
ベルト伝動式自動変速機において、前記駆動軸に可動プ
ーリ半体の背面にカバープレートを設け、該カバープレ
ー１〜と可動プーリ半体との間にレシオ可変液汁室を形
成し、該レシオ可変液圧室に流動体を封入するとともに
レシオ可変液圧室と外部とを連通ずる換気孔を前記カバ
ープレー１〜に穿設したことを特徴としている。In order to achieve the above object, the present invention provides a drive shaft with a fixed bobbin half and a movable pulley half, and changes the interval of the V-shaped annular vortex formed between the two pulley halves by centrifugal force. V
In the belt transmission type automatic transmission, a cover plate is provided on the back surface of the movable pulley half on the drive shaft, a variable ratio liquid chamber is formed between the cover plate 1 to the movable pulley half, and the variable ratio liquid The cover plate 1 is characterized in that a ventilation hole is formed in the cover plate 1 to seal a fluid in the pressure chamber and communicate the variable ratio hydraulic pressure chamber with the outside.

（作　用） これにより、レシオ可変液圧室に封入された流動体に働
く遠心力を利用して可動ブーり半体を固定ブーり半体に
接近・離間させて駆動側ＶプーリのＶ字形環状溝の間隔
を可変する。(Function) As a result, the movable bobbin half approaches and separates from the fixed bobbin half by using the centrifugal force acting on the fluid sealed in the variable ratio hydraulic pressure chamber, thereby forming the V-shape of the drive side V-pulley. Variable spacing between annular grooves.

〔実施例〕〔Example〕

本発明の一実施例を第２図及び第３図に基づいて説明す
る。An embodiment of the present invention will be described based on FIGS. 2 and 3.

駆動源に連結される駆動軸２０には駆動側可変径Ｖプー
リ２１が設りられている。このＶプーリ、２１は固定プ
ーリ半体２２と可動プーリ半体２３とで構成されており
、固定プーリ半休２２はその一面に円錐面２４を有する
盤状に形成されて駆動軸２０の炉部に固着され、可動ブ
ーり半体２３はその一面に円錐面２５を有して短円筒状
に形成されて駆動軸２０に固着されるガイドボス２６上
に軸方向に移動自在に嵌挿されており、固定プーリ半体
２２と可動プーリ半体２３とは相対面してＶ字形環状溝
２７を形成し、この環状溝２７内にＶベルト２８が挿入
され、相対面する円錐面２４゜２５にて挟持される。A drive-side variable diameter V-pulley 21 is provided on a drive shaft 20 connected to a drive source. This V-pulley 21 is composed of a fixed pulley half 22 and a movable pulley half 23, and the fixed pulley half 22 is formed into a disk shape with a conical surface 24 on one side and is connected to the furnace part of the drive shaft 20. The fixed movable boob half body 23 is formed into a short cylindrical shape with a conical surface 25 on one side, and is fitted onto a guide boss 26 fixed to the drive shaft 20 so as to be movable in the axial direction. The fixed pulley half 22 and the movable pulley half 23 face each other to form a V-shaped annular groove 27, and a V-belt 28 is inserted into this annular groove 27, with conical surfaces 24 and 25 facing each other. Being pinched.

可動プーリ半体２３の背面側のガイドボス２６の端部（
第２図において右側〉にはカバープレー１〜２９が固着
され、このカバープレート２９と可動ブーり半体２３と
の間にレシオ可変液圧室３０を形成し、このレシオ可変
液圧室３０内に例えばオイル等の液体りを封入し、シー
ル材３１．３２によりレシオ可変液汁室３０をシールす
る。The end of the guide boss 26 on the back side of the movable pulley half 23 (
Cover plates 1 to 29 are fixed to the right side in FIG. For example, a liquid such as oil is sealed in the variable ratio liquid chamber 30 with sealing materials 31 and 32.

そして、カバープレート２９に、カバープレート２９と
可動ブーり半体２３とを一体に回転させるとともに可動
プーリ半体２３の軸方向の移動をガイドするプーリスト
ロークガイドピン３３を設置Ｊ１可動ブーり半体２３の
背面に形成したガイド部３４に挿入し、ブーリスミルロ
ーフガイドピン３３の７ランジ３３ａとガイド部３４の
端部３４ａとは駆動軸２０の低速回転時に当接させて、
ローレジオ時にス１〜ツバとする。Then, a pulley stroke guide pin 33 is installed on the cover plate 29 to rotate the cover plate 29 and the movable bobbin half body 23 together and to guide the movement of the movable pulley half body 23 in the axial direction. 23, and the seven flange 33a of the Bourlis mill loaf guide pin 33 and the end 34a of the guide part 34 are brought into contact with each other when the drive shaft 20 rotates at low speed.
Make a splash during low res.

また、カバープレー１−２９の内面に、プーリガイドス
トロークピン３３の半径方向内方にレシオ可変液圧室３
０と連通する通路３５を設け、該通路３５と連結する換
気孔３６をカバープレート２９に穿設し、可動プーリ半
体２３の端部に駆動軸１の高速回転時にカバープレート
２９と当接するハイレシオ時のストッパ３７を設けてい
る。Further, a variable ratio hydraulic chamber 3 is provided on the inner surface of the cover plate 1-29 in the radial direction inward of the pulley guide stroke pin 33.
0, a ventilation hole 36 connected to the passage 35 is provided in the cover plate 29, and a high-ratio motor is provided at the end of the movable pulley half 23 that comes into contact with the cover plate 29 when the drive shaft 1 rotates at high speed. A time stopper 37 is provided.

従動軸３８には従動側可変径Ｖプーリ３９が設けられて
いる。このＶプーリ３９は従動軸３８の外周に軸受４０
．４．１を介して回動自在に支承される筒軸状のプーリ
ガイドカラー４２と、このプーリガイドカラー４２の外
周に回動可能に嵌装される筒軸状の固定プーリ軸４３と
この固定プーリ軸４３の内端（第２図において右側）に
固設される円錐部４４を有する固定プーリ半体４５と、
固定プーリ軸４３の外端側（第２図において左側）のプ
ーリガイドカラー４２の外周に回動可能かつ軸方向に移
動可能に嵌装される可動プーリ軸４６と、この可動ブー
り軸４６の内端（第２図において右側）に固設される円
錐部４７を有する可動プーリ半体４８とで構成され、固
定プーリ半体４５と可動ブーり半体４８とは互いに相対
向してＶ字形環状溝４９を形成し、この環状溝４９内に
Ｖベルト２８が挿入され、円錐部４４．．４．７にて挟
持される。これによりＶベルト２８は駆動側可変径Ｖプ
ーリ２１と従動側可変径Ｖブー１３９間に張架される。The driven shaft 38 is provided with a driven side variable diameter V pulley 39 . This V pulley 39 has a bearing 40 on the outer periphery of the driven shaft 38.
．． 4.1, a cylindrical shaft-shaped pulley guide collar 42 rotatably supported via a fixed pulley half 45 having a conical portion 44 fixed to the inner end of the pulley shaft 43 (on the right side in FIG. 2);
A movable pulley shaft 46 is rotatably and axially movably fitted to the outer periphery of the pulley guide collar 42 on the outer end side (left side in FIG. 2) of the fixed pulley shaft 43; The movable pulley half 48 has a conical part 47 fixed to the inner end (on the right side in FIG. 2), and the fixed pulley half 45 and the movable pulley half 48 face each other in a V-shape. An annular groove 49 is formed, into which the V-belt 28 is inserted, and a conical portion 44 . ．． It is clamped at 4.7. As a result, the V-belt 28 is stretched between the drive-side variable-diameter V-pulley 21 and the driven-side variable-diameter V-boo 139.

プーリガイドカラー４２には第１トルクカムピン５０と
第２トルクカムビン５１とが植設され、第１１〜ルクカ
ムビン５０は固定プーリ軸４３に形成したカム溝５２と
、第２トルクカムピン５１は可動ブーり軸４６に形成し
たカム溝５３とそれぞれ係合している。A first torque cam pin 50 and a second torque cam pin 51 are implanted in the pulley guide collar 42. They are respectively engaged with cam grooves 53 formed on the shaft 46.

プーリガイドカラー４２の外端（第２図において左側）
にはカバー５４が固着され、このカバー５４と可動プー
リ軸４６との間にコイルスプリング５５が縮設され、可
動ブーり半体４８を固定ブーり半体４５に接近するよう
付勢しており、プーリガイドカラー３９の内端（第２図
において右側）には、遠心クラッチ機構５６が設けられ
ている。Outer end of pulley guide collar 42 (left side in Figure 2)
A cover 54 is fixed to the movable pulley shaft 46, and a coil spring 55 is compressed between the cover 54 and the movable pulley shaft 46 to urge the movable bobbin half 48 to approach the fixed bobbin half 45. A centrifugal clutch mechanism 56 is provided at the inner end of the pulley guide collar 39 (on the right side in FIG. 2).

次にこのように構成された自動変速機の作用について説
明すると、駆動軸２０の“回転が低いときには、第２図
に示す如く従動側可変Ｖプーリ３９の可動ブーり半体４
８がスプリング５５で固定プーリ半体４５方向へｆ」勢
されているので、Ｖ字形環状溝４９の間隔は狭くなって
いるところから、従動側■プーリ３９に対する■ベル１
〜２８の巻掛径は大きく保持され、一方駆動側Ｖプーリ
２１のＶ字形環状溝２７の間隔は広がっており、Ｖベル
ト２８の駆動側Ｖプーリに対する巻掛径は小さく保持さ
れて駆動軸２０の回転は減速されて従動側Ｖプーリ３９
に伝達されている。Next, to explain the operation of the automatic transmission configured in this way, when the rotation of the drive shaft 20 is low, the movable bobbin half 4 of the driven side variable V-pulley 39 moves as shown in FIG.
8 is forced by the spring 55 toward the fixed pulley half 45, the interval between the V-shaped annular grooves 49 is narrow, and the driven side
The winding diameter of V-belt 28 is kept large, while the interval between the V-shaped annular grooves 27 of the drive-side V-pulley 21 is widened, and the winding diameter of the V-belt 28 with respect to the drive-side V-pulley is kept small, so that the drive shaft 20 The rotation of the driven side V-pulley 39 is reduced.
has been communicated to.

そして、駆動＠ｌ＋　２０の回転数が高くなるにつれて
、レシオ可変液圧室３０内の液体りに発生する遠心液圧
荷重ＰＦが従動側■プーリ３９の可動プーリ半体４８を
付勢しているスプリング５５の付勢力を上回ると、第３
図に示す如く駆動側Ｖプーリ２１の可動ブーり半体２３
がプーリストロークガイドピン３３をガイドに固定プー
リ半体２２に接近し、Ｖ字形環状溝２７の間隔を狭くし
てＶベルｌ−２８０巻掛径を大きくし、これにより従動
側Ｖプーリ３９の可動プーリ半体／１８はスプリング５
５に抗して固定プーリ半体４５から離れ、■字形環状ｔ
Ｍ’１９の間隔は広くなってＶベル１へ２８の巻掛径を
小さくし、従動軸３５の回転が増速される。As the rotation speed of the drive @l+ 20 increases, the centrifugal hydraulic load PF generated in the liquid in the variable ratio hydraulic pressure chamber 30 urges the movable pulley half 48 of the driven pulley 39. When the biasing force of the spring 55 is exceeded, the third
As shown in the figure, the movable bobbin half 23 of the drive side V-pulley 21
approaches the fixed pulley half 22 using the pulley stroke guide pin 33 as a guide, narrows the interval between the V-shaped annular grooves 27, and increases the winding diameter of the V-bell l-280, thereby allowing the driven side V-pulley 39 to move. Pulley half/18 is spring 5
5, it separates from the fixed pulley half 45, and the ■-shaped annular t
The interval M'19 is widened to reduce the diameter of 28 wound around the V-bell 1, and the rotation speed of the driven shaft 35 is increased.

また、駆動軸２０の回転数が低くなるど、駆動側Ｖプー
リのレシオ可変液圧室３０内の遠心液圧荷重ＰＦが従動
側Ｖプーリ３９のスプリング５５に付勢力を下回り、従
動側Ｖプーリ３９の可動プーリ半体４８が固定ブーり半
体４５に接近してＶ字形環状溝４９の間隔を狭くしてＶ
ベル１〜２８の巻掛径を大きくし、これにより駆動側Ｖ
プーリ２＋＋　　　　　− １に対するＶベルト２８の巻掛径を小さくして従動軸３
８を減速する。Furthermore, as the rotational speed of the drive shaft 20 decreases, the centrifugal hydraulic load PF in the ratio variable hydraulic pressure chamber 30 of the drive side V-pulley becomes less than the urging force on the spring 55 of the driven side V-pulley 39, and the driven side V-pulley The movable pulley half body 48 of No. 39 approaches the fixed booby half body 45, narrowing the interval between the V-shaped annular grooves 49, and forming a V-shaped groove.
By increasing the winding diameter of bells 1 to 28, the driving side V
By reducing the winding diameter of the V-belt 28 around the pulley 2++-1, the driven shaft 3
Slow down 8.

ざらに従動軸３８に一定以上の負荷がかかった場合も同
様に、従動側Ｖプーリ３９の可動プーリ半体４８が固定
プーリ半体４５に接近してＶ字形環状溝４９の間隔を狭
くして従動側Ｖプーリ３９を減速さゼて所望の１−ルク
を得る。Similarly, when a load exceeding a certain level is applied to the driven shaft 38, the movable pulley half 48 of the driven side V-pulley 39 approaches the fixed pulley half 45, narrowing the interval between the V-shaped annular grooves 49. The driven V-pulley 39 is decelerated to obtain the desired 1-lux.

このようにして駆動側Ｖプーリ２１及び従動側Ｖプーリ
３９のＶ字形環状溝２７．４９の間隔を可変して変速を
行っているが、レシオ可変液圧室３０が密閉されている
と、駆動側Ｖプーリ２１の可動ブーり半体２３の移動に
より該液圧室３０内の空気圧が変動して可動ブーり半体
２３の円滑な移動が阻害されるので、レシオ可変液圧室
３０を通路３５．換気孔３６を介して外部と連通させて
空気圧の変動を防いでいる。この通路３５及び換気孔３
６は駆動軸２０の回転が停止した場合には、プーリガイ
ドストロークピン３３の７ランジ３３ａとガイド部３４
の端部３４ａが当接するので、レシオ可変液圧室３０と
の連通が遮断される位置に設【プられている。In this way, the speed is changed by varying the interval between the V-shaped annular grooves 27 and 49 of the driving side V-pulley 21 and the driven side V-pulley 39, but if the variable ratio hydraulic pressure chamber 30 is sealed, the driving side V-pulley 21 and the driven side V-pulley 39 are The movement of the movable bobbin half 23 of the side V-pulley 21 fluctuates the air pressure in the hydraulic pressure chamber 30 and obstructs the smooth movement of the movable bobbin half 23. 35. It is communicated with the outside through a ventilation hole 36 to prevent fluctuations in air pressure. This passage 35 and ventilation hole 3
6 indicates that when the rotation of the drive shaft 20 stops, the 7 flange 33a of the pulley guide stroke pin 33 and the guide portion 34
Since the end portion 34a of the hydraulic pressure chamber 30 comes into contact with the variable ratio hydraulic pressure chamber 30, it is set at a position where communication with the variable ratio hydraulic pressure chamber 30 is cut off.

また、駆動側Ｖプーリ２１の可動プーリ半休２３を移動
させる遠心液圧荷重Ｐ「は、封入される液体比重をｒ、
速度をＷ、液面外径をｒＦｌ、液面内径をｒＦ２とする
と、 の関係となる。In addition, the centrifugal hydraulic load P" that moves the movable pulley half-rest 23 of the drive side V-pulley 21 is the specific gravity of the enclosed liquid r,
When the speed is W, the outer diameter of the liquid surface is rF1, and the inner diameter of the liquid surface is rF2, the relationship is as follows.

したがって、伝達動力に応じて液体の種類及び量を選択
してやればよく、また、高速回転時の必要遠心液圧荷手
に合わせてレシオ可変液圧室３０の形状を決定すればよ
い。Therefore, the type and amount of liquid may be selected depending on the transmitted power, and the shape of the variable ratio hydraulic chamber 30 may be determined in accordance with the required centrifugal hydraulic load during high-speed rotation.

このにうにして遠心液圧荷重ＰＦを決定づればにいので
、軽量−１ンパク［−で伝達動力の大きな自動変速機と
することができ、また、ブーり内に液体を封入づ゛るこ
とににす、自動変速機内に発生づる振動を減衰できる。Since it is possible to determine the centrifugal hydraulic load PF in this way, it is possible to create an automatic transmission that is lightweight and has a large transmission power, and it is also possible to seal the liquid in the boob. This can dampen vibrations that occur within automatic transmissions.

尚、１記実施例ではレシオ可変液圧室内に液体を封入し
たもので説明したが、液体に他の粒体又は違う流体を組
合わせて使用しても良い事は勿論である。In the first embodiment, the liquid is sealed in the variable ratio hydraulic pressure chamber, but it goes without saying that the liquid may be used in combination with other particles or a different fluid.

〔発明の効果〕〔Effect of the invention〕

本発明は一ヒ記のように、駆動軸に固定ブーり半体と可
動ブーり半休とを設け、両プーリ半体間に形成されるＶ
字形環状渦の間隔を遠心力により可変するＶペル１〜伝
動式自動変速機において、前記駆動軸に可動プーリ半体
の背面にカバープレートを設り、該カバープレートと可
動ブーり半休との間にレシオ可変液圧室を形成し、該レ
シオ可変液圧室に流動体を封入するとともにレシオ可変
液圧室ど外部とを連通する換気孔を前記カバープレーＩ
〜に穿設したので、従来のようにウェイ１−〇−ラの移
動による摩耗の発生がなく、また、必要以上の遠心液圧
荷重の発生を防止でき、軒吊］ンパク１〜で伝達動力の
大きなＶペル１〜伝動式自動変ＩＡＩａとすることがで
きる。The present invention, as described in Part 1, includes a fixed bobbin half and a movable bobbin half on the drive shaft, and a V formed between the two pulley halves.
In the V-pel 1-transmission type automatic transmission in which the spacing between the annular vortices is varied by centrifugal force, a cover plate is provided on the back of the movable pulley half on the drive shaft, and a cover plate is provided between the cover plate and the movable boot half. A variable ratio hydraulic pressure chamber is formed in the cover plate I, and a fluid is sealed in the variable ratio hydraulic pressure chamber, and a ventilation hole communicating with the outside of the variable ratio hydraulic pressure chamber is provided in the cover plate I.
Since the holes are drilled in ~, there is no wear caused by the movement of way 1-○-ra as in the past, and it is also possible to prevent the generation of centrifugal hydraulic pressure loads that are more than necessary, and the transmitted power can be transmitted with It can be a large V-pel 1 to a transmission type automatic variable IAIa.

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

第１図は従来のＶベルト伝動式自動変速機の一例を示す
断面図、第２図及び第３図は本発明の一実施例を示すも
ので、第２図は駆動軸の低速回転−１５一 時の状態を示す断面図、第３図は駆動軸の高速回転時の
状態を示す断面図である。 ２０・・・駆動軸　　２１・・・駆動側可変径Ｖプーリ
２２・・・固定プーリ半体　　２３・・・可動ブーり半
休２７・・・Ｖ字形環状溝　　２８・・・Ｖベルト２９
・・・カバープレーｉ〜　　３０・・・レシオ可変液圧
室　　１−・・・液体　　３６・・・換気孔特　許　出
　願　人　本田技研工業株式会社豪２巳Fig. 1 is a sectional view showing an example of a conventional V-belt transmission type automatic transmission, Figs. 2 and 3 show an embodiment of the present invention, and Fig. 2 shows a low-speed rotation of the drive shaft - FIG. 3 is a sectional view showing a temporary state, and FIG. 3 is a sectional view showing a state when the drive shaft rotates at high speed. 20... Drive shaft 21... Drive side variable diameter V-pulley 22... Fixed pulley half 23... Movable boolean half rest 27... V-shaped annular groove 28... V-belt 29
...Cover play i~ 30...Variable ratio hydraulic chamber 1-...Liquid 36...Ventilation hole Patent applicant: Honda Motor Co., Ltd. Gojimi

Claims (1)

【特許請求の範囲】[Claims] １、駆動軸に固定プーリ半体と可動プーリ半体とを設け
、両プーリ半体間に形成されるＶ字形環状溝の間隔を遠
心力により可変するＶベルト伝動式自動変速機において
、前記駆動軸に可動プーリ半休の背面にカバープレート
を設け、該カバープレートと可動プーリ半体との間にレ
シオ可変液圧室を形成し、該レシオ可変液圧室に流動体
を封入するとともにレシオ可変液圧室と外部とを連通す
る換気孔を前記カバープレートに穿設したことを特徴と
するＶベルト伝動式自動変速機。1. A V-belt transmission type automatic transmission in which a fixed pulley half and a movable pulley half are provided on the drive shaft, and the interval between the V-shaped annular grooves formed between the two pulley halves is varied by centrifugal force. A cover plate is provided on the back of the movable pulley half on the shaft, a variable ratio hydraulic pressure chamber is formed between the cover plate and the movable pulley half, a fluid is sealed in the variable ratio hydraulic pressure chamber, and a variable ratio liquid is filled. A V-belt transmission automatic transmission, characterized in that a ventilation hole communicating between the pressure chamber and the outside is formed in the cover plate.