JPH0536661B2

JPH0536661B2 -

Info

Publication number: JPH0536661B2
Application number: JP15320889A
Authority: JP
Inventors: Tomizo Kaneoka; Hidefumi Akao; Katsuyuki Hioki; Toshiaki Arakane
Original assignee: Mitsuboshi Belting Ltd
Current assignee: Mitsuboshi Belting Ltd
Priority date: 1989-06-14
Filing date: 1989-06-14
Publication date: 1993-05-31
Also published as: JPH0320159A

Description

[Detailed description of the invention]

（産業上の利用分野）本発明は自動車を始めとする車輌の無段変速装
置に使用されるベルト式無段変速装置および同装
置に用いる変速プーリに係り、詳しくは固定プー
リ片と可動プーリ片によつて形成される変速プー
リに係合されたベルトが可動プーリ片によつて押
圧される力、即ち、推力を入力軸（駆動軸）又は
出力軸（従動軸）の回転数の変化によつて敏感に
変動させることにより出力軸（従動軸）の回転数
を制御せしめるようにしたベルト式無段変速装置
および変速プーリに関するものである。（従来の技術）自動車など車輌用のベルト式無段変速装置とし
て固定プーリ片と可動プーリ片からなる変速プー
リを夫々平行に配置せしめた入力軸と出力軸に装
着し、夫々のプーリ片によつて形成されるＶ溝に
Ｖルトを掛架せしめた構成の変速装置が使用され
ており、それら変速プーリにおいて各可動プーリ
片を押圧する推力として油圧あるいは遠心力によ
るプーリが提案されている。このうち、油圧によ
る推力装置をもつものとしては一般に各可動プー
リ片の背部に油圧シリンダーを設け、このシリン
ダー内へ供給する作動油量を電子制御装置によつ
て制御するものであり、例えば米国特許第
4601680号明細書に開示されている。また、遠心力による変速プーリは、例えば、特
公昭51−6815号公報で代表されるように固定Ｖプ
ーリ片と、可動プーリ片からなる変速Ｖプーリに
おいて、可動プーリ片背面に囲い板を有してその
内部に回転時、遠心力により運動して可動プーリ
片を固定プーリ片に対して相対的に軸線方向に動
かしプーリの有効径を変化させるおもりを収設せ
しめた構成からなつており、そのおもりとして一
般に鋼球（ボール）が用いられ、通常、放射状の
ガイドが付設されていて、このガイドにボールが
一個宛挿入され、プーリの回転に伴つてボールが
ガイド溝に沿つてラジアル方向に移動するように
なつている。なお、上記遠心力推力変速プーリは、これを入
力軸に使用する場合には、出力軸には可動プーリ
片の背部にコイルスプリングを介装した変速プー
リが通常装着されている。一方、更に上記の各変速プーリとは別に回転軸
と共に回転する流体溜め部を設け、該溜め部の流
体の流速変化をピトー管によつて感知して変速度
合を制御する無段変速装置も近時、提案されてい
る。（特開昭59−222660号公報参照）（発明が解決しようとする課題）しかしながら、油圧方式を用いた上変速装置で
は電子制御装置によつてオイル量を制御している
ため、電子制御装置が取り込むデータ量が多く、
またそのため数多くのセンサーを取り付けなけれ
ばならないため、高価な装置になる問題を有して
いる。また、前記遠心推力式変速プーリを入力軸に取
り付けた装置では、特に低回転領域において変速
に必要な可動プーリ片の推力が得られず、逆に高
回転領域になるとプーリの回転数の二乗に比例し
て鋼球群の遠心力が急激に大きくなり過剰な推力
が発生する問題があつた。そこで、ベルトが入力
側から出力側に動力を伝達する際には、入力軸回
転数を大きくすると共にプーリ径を大きくしてプ
ーリの回転数の上昇に伴う推力の上昇を徐々に大
きくする必要があり、またそのため、従来の変速
装置は低回転領域において実用化が困難であり、
変速プーリ自身を大きくする必要もあつた。さらに、この装置においては固定プーリ片と可
動プーリ片間のＶ溝巾を可変する抵抗等が要因に
なり、入力回転の変化に対して遠心力の変化が遅
れ、即ち応答遅れが生じ、加速時と減速時とで入
力回転の変化に対する出力回転数の変化を示す曲
線が大きくずれてヒステリシスロスを発生させる
変速特性になつていた。そのため、このようなヒ
ステリシスロスを発生する変速装置は車体に使用
すれば入力軸の回転数が同じでも出力軸の回転数
が相違するために、安全性、操作性に欠けてい
た。一方、回転軸と共に回転する流体溜め部の流体
速度を感知するものは、その流速を感知する手段
として、ピトー管を利用しているが、このピトー
管の形状としては従来第６図に示す如くストレー
トの管であり、先端を約45°程度の角度でカツト
し、その断面は縦に伸びた菱形もしくは船形にな
つていたために、軸の中心に近い流速の遅いとこ
ろと外周に近い流速の早いところとを同時に受け
ており、高い流体圧を得ることができなかつた。本発明は上述の如き従来の種々の問題点を解決
するものであり、特に軸の回転数に応じて変速プ
ーリの推力を敏感に変化させることにより、入力
軸と出力軸との回転数においてヒヘテリシスロス
の小さい変速特性を有すると共に、ピトー管の形
状を変えることによつて、高い流体圧が得られる
ようなベルト式無段変速装置及び変速プーリを提
供することを目的とするものである。（課題を解決するための手段）即ち、上記目的に適合するための本発明は入力
軸と出力軸に固定プーリ片と、この固定プーリ片
に対向して軸上の長手方向に摺動可能に配設した
可動プーリ片からなる変速プーリを設け、これら
両プーリ片によつて形成されたＶ状溝に動力伝動
用ベルトを掛架してなるベルト式無段変速装置に
おいて、前記入力軸に配設した可動プーリ片の背
部には油圧シリンダー部を、また固定プーリ片の
背部外周部には流体溜め部を夫々設けると共に、
流体溜め部内に前記油圧シリンダーと連結し、か
つ、開孔が前記流体溜め部の円筒周面と平行な偏
平形状であるトピー管を挿入せしめ、該ピトー管
をエンジンのスロツトルに連結されたレバーの回
転に応じロータリージヨイントを中心に揺動可能
として開孔の固定プーリ片半径方向の位置および
流体の流れ方向に対する角度を変化させ得る如く
なした構成を採用している。また、本発明は上記無段変速装置を形成する変
速プーリ自体の構成として固定プーリ片と該固定
プーリ片に対向して軸方向摺動可能に設けられる
可動プーリ片からなり、固定プーリ片の背部には
流体溜め部が固定され、一方、可動プーリ片は背
部に油圧シリンダー部が設けられて、該シリンダ
ーによつて駆動されると共に、前記流体溜め部内
には前記油圧シリンダーと連通し、開孔が前記流
体溜め部の円筒周面に対し平行な偏平形状である
ピトー管が挿入されており、該ピトー管はエンジ
ンのスロツトルに連結されたレバーの回転に応じ
てロータリージヨイントを中心に揺動し、開孔の
固定プーリ片半径方向の位置および流体の流れ方
向に対する角度を変化させ得る構成も特徴とす
る。そして、上記夫々の構成において、ピトー管に
よつて流体溜め部内を流れる流体の流れを妨げな
いためにピトー管の断面形状は流体溜め部内の流
体の流れに対し流線形状であることが望ましく、
またピトー管によつて得られる流体圧をより高め
るためにピトー管形状は圧力損失の少ない曲管で
あることが好ましい。また、本発明は上記の構成においてピトー管の
流体溜め部とは全く別個に油圧発生源を設け、こ
の油圧発生源を圧力制御弁を介して油圧シリンダ
ーと接続する一方、ピトー管を圧力制御弁に接続
し、ピトー管の変化に応じて圧力制御弁を動作さ
せ油圧シリンダーを作動させる構成も特徴とす
る。なお、上記本発明においては、前記出力軸に配
設した可動プーリ片とこの背部に設けられたスト
ツパーとの間にコイルスプリングを介在し、かつ
可動プーリ片と、延長筒状部の一方に傾斜面を有
する突出部を、他方にこれと噛み合う窪み部を設
け、該突出部と窪み部の傾斜面を接触係合させた
カム機構を有するトルク伝達部を備えたベルト式
無段変速装置をも包含する。（作用）前記本発明装置によると、まず入力軸又は出力
軸が回転すると、その回転数に応じてピトー管が
流体溜め部内の流体の流速変化と圧力変化を敏感
に感知して流体を油圧シリンダー内外へ供給もし
くは排出して可動プーリ片の推力をタイムリーに
調節し、またこれに伴い出力軸の可動プーリ片も
例えばスプリング及びカム機構を有するトルク伝
達部の作動によつて敏感に推力が変化して出力軸
の回転数を即座に変化させる。また、入力回転の増速あるいは減速時において
も、前記入力軸の回転数の変化に対してピトー管
が油圧シリンダーの内圧の変化を助長して、油圧
シリンダーの内圧の変化感度を高めることで、ヒ
ステリシスロスの小さい変速特性にすることがで
きる。更に流速感知部材の開孔部の形状を流体溜め部
の円周筒面に対して平行な偏平形状にしたことに
より同じ流速の部分の流体を受けることとなり、
開孔部を周面にできる限り近付けることによつて
高い流体圧を得ることができる。（実施例）以下、更に本発明の実施例を添付図面に従つて
説明する。第１図は本発明に係るベルト式無段変速装置の
１例を示す断面図である。かかる本発明ベルト式無段変速装置１は主とし
て自動車等に取り付けられる無段変速機構
（CVT）に適用されるものであり、図より明らか
なように、エンジン等のクランク軸に間接的に連
結された入力軸（駆動軸）２と出力軸（従動軸）
３とが平行に配置され、これらの軸２，３に夫々
変速プーリ４，５が取り付けられると共に、取り
付けられた変速プーリ４，５間にわたつて動力伝
動用ベルトＢが掛架されている。ここで、各変速プーリ４，５は固定プーリ６，
３６と該固定プーリに対し摺動可能に配設された
可動プーリ片８，３８とからなつており、前記動
力伝動用ベルトＢは両プーリ片によつて形成され
るＶ状溝に掛架されている。このうち、前記入力軸２に取り付けられた変速
プーリ４においては、固定プーリ片６がボルト７
（又は、図示しないがスプライン、キーその他の
方式でも良い）によつて該入力軸２に固定され、
他方これに対向する位置には可動プーリ片８が固
定プーリ片のシーブ軸９上に嵌入され、同時にス
プラインまたは滑りキー１０に嵌め込まれ、軸２
と共に回転するとともに軸方向には摺動可能にな
つている。そして、上記変速プーリ４の固定プーリ片６の
背部外周部にはリング状の流体溜め部１１が設け
られ、少なくとも１つ以上のピトー管１２の先端
開孔部１３がこの流体溜め部１１内に挿入されて
いる。上記ピトー管１２は固定プーリ片６の回転数に
応じて変化する流体溜め部１１内の流体の速度及
び圧力を感知するものであり、ベルト式変速装置
１のハウジング１４に固定され、固定プーリ片６
の背面にあつて該固定プーリ片６の平面に対して
平行である面に管を回転することができるロータ
リージヨイント１５に接続されている。そして、該ロータリージヨイント１５は、一端
に一対のマイタ歯車６０，６０′が設けられ、一
方のマイタ歯車６０′には、一端がハウジング１
４外に突出された回転軸６１が設けられていると
共に、ハウジング１４外に突出された回転軸６１
の端にはレバー６２が固定され、該レバー６２は
ワイヤー（図示せず）でエンジンのスロツトルに
連結されていて、アクセルの踏み角に関係してレ
バー６２が揺動し、回転軸６１、タイマ歯車６
０，６０′を経てロータリージヨイント１５が回
転しピトー管が回転して、第２図に示すアーム部
分７０先端の開孔６６の位置が移動するようにな
つている。一方、前記可動プーリ片８はその背部において
油圧シリンダー１６が設けられている。この油圧
シリンダー１６は固定プーリ片のシーブ軸９に固
着された固定板１７と可動プーリ片の筒状側壁１
８およびスプリング６３から構成され、圧力媒体
となる作動油その他の流体の供給と排出によつて
内圧が変化し可動プーリ片８を矢印方向へ移動可
能にしている。勿論、上記固定板１７の頂面にバ
ツキングを装着してもよい。スプリング６３は可
動プーリ片８を固定プーリ片６側へ押圧すべく圧
縮状態で固定板１７と筒状側壁１８によつて形成
される空間内に挿入されている。そして、前記油圧シリンダー１６は入力軸２内
に設けられた流体通路１９を介して入力軸２の一
端に連通され、ハウジング１４の軸受部に設けら
れた空洞６４に開孔している。前記ハウジング１４の空洞部６４は図に示す如
く油圧ホース６５又はケース内通路によつて、ロ
ータリージヨイント１５に接続されており、油圧
シリンダー１６とピトー管１２は流体通路１９、
空洞６４、油圧ホース６５、ロータリージヨイン
ト１５より成る一連の油圧回路によつてピトー管
１２及び流体溜め部１１に接続されている。そのため、流体溜め部１１内の流体はピトー管
１２の先端開孔部１３から流入、排出され、常時
入力軸２の回転数に応じて油圧シリンダー１６の
内圧を調節している。また、前記流体溜め部１１においては、流体を
常に補給する流体供給部２０があつて、これは本
装置１のハウジング１４内に溜められた流体、即
ち油等をパイプ２２を介して、タンク２３内へ回
収し、ポンプ２４よつて流体供給口２５から流体
溜め部１１へ補給するもので、流体は常にリサイ
クルされる。尚、流体溜め部１１から溢れ出た流
体は自然に落下する。次に一方、出力軸３に取り付けられた変速プー
リ５においては、ハウジング２１内で固定プーリ
片３６が出力軸３に一体的に固着され、他方これ
に対向するように可動プーリ片３８が固定シーブ
片のシーブ軸３９上に嵌入されてベルトＢを係合
するＶ状溝を形成している。前記可動プーリ片３８は固定シーブ片とシーブ
軸３９上を摺動自在で軸方向に対して移動可能な
ようになつているが、この可動プーリ片３８の右
方向のシーブ軸３９上にはフランジ状のストツパ
ー４０がボルト４１によつて固定され、また該ス
トツパー４０と可動プーリ片３８の間には反撥弾
性を有するコイルスプリング４２が常に可動プー
リ片３８を固定プーリ片３６の方向へ押圧する状
態で取り付けられている。なお図中、５０はトルク伝達部であり、第８図
に示すように可動プーリ片の延長筒状部４３には
少なくとも１つ以上の突出部４４があり、この突
出部の側面は長手方向に対して角度θ₁、θ₂（夫々
約20°〜70°）の傾斜面４５になつている。この場
合、θ₁、θ₂は通常は差を有するが、等しくてもよ
い。一方、ストツパーの延長筒状部４６には前記
突出部４４の側面の傾斜面４５に当接する傾斜面
４７をもつた窪み部４８が噛み合つた状態にな
り、しかも夫々の傾斜面４５，４７が当接するこ
とにより、可動プーリ片３８に推力が生じ、また
可動プーリ片３８が出力軸３にトルクを伝達する
カム機構付のトルク伝達部５０を形成している。即ち、可動プーリ片３８が回転すると可動プー
リ片の突出部４４とストツパーの窪み部４８とが
噛み合つて傾斜面４５，４７同志で当接し、可動
プーリ片３８のトルクがストツパー４０から出力
軸３へ伝達される。また、前記トルク伝達部５０
の傾斜面同志の噛み合い力から生じる軸方向の分
力とスプリング力は可動プーリ片３８に効率的な
推力を与えている。叙上の如きベルト式無段変速装置において、本
発明では特に流体溜め部１１とピトー管１２を含
む一連の構成に重要な特徴を有しており、回転す
る流体溜め部１１とピトー管１２によつて得られ
るピトー圧を直接、油圧シリンダー１６の作動に
用いるためにできる限り高いピトー圧を得ること
が重要となる。そのため本発明では第２図ないし
第５図に示すようにピトー管１２の先端部開孔６
６の形状を流体溜め部１１の円筒周面に対し平行
な偏平形状となしている。従つて、高いピトー圧が必要ときには、ピトー
管１２の開孔６６を流体溜め部１１の外周面に近
付けることによつて流速の速い部分だけの流体圧
を受けることができ、高いピトー圧を得ることが
可能となる。また、ピトー管１２中にて圧力損失
を出さないためにピトー管１２は第３図の如く円
弧状に曲げることが好ましく、圧力損失をより少
なくするためにはその曲げ角度は105°〜112.5°程
度が好適である。更に、流体溜め部１１の流れを妨げないように
第４図及び第５図の断面で示す如く流体に対し流
線形状をとることが有効である。因に、ピトー管１２の形状による各流体圧の差
を具体的に示せば、以下の如くである。即ち、第３図ないし第５図に示す断面が流線形
で、開孔が流れに対して垂直方向に向いた本発明
における曲管のピトー管１２と、第６図に示すよ
うに流体に対し垂直方向に挿入した断面が菱形の
直管で、先端を45度の角度で切り落としたピトー
管１２ａと、第７図に示すように断面を船形にし
た以外は第６図と同じような形状にしたピトー管
１２ｂの３種類のピトー管について、軸の中心か
ら流体の外周部までが158mmで、巾は30mm、高さ
が29mmの流体溜め部に先端が流体の外周部から
0.5mmのところに位置するように夫々挿入し、得
られる最大のピトー圧を測定したところ、下記第
１表に示すような結果を得た。なお、流体としてはオイル（日石マルパス
＃10）を用い、回転は2600r.p.mにした。 (Industrial Application Field) The present invention relates to a belt-type continuously variable transmission device used in a continuously variable transmission device for vehicles such as automobiles, and a speed change pulley used in the device, and specifically relates to a fixed pulley piece and a movable pulley piece. The belt engaged with the variable speed pulley formed by The present invention relates to a belt-type continuously variable transmission device and a variable speed pulley that control the rotational speed of an output shaft (driven shaft) by sensitively varying the rotation speed of the output shaft (driven shaft). (Prior art) As a belt-type continuously variable transmission for vehicles such as automobiles, a variable speed pulley consisting of a fixed pulley piece and a movable pulley piece is attached to an input shaft and an output shaft that are arranged parallel to each other. A transmission device is used in which a V-rut is suspended in a V-groove formed by a V-groove, and a pulley using hydraulic pressure or centrifugal force has been proposed as a thrust force for pressing each movable pulley piece in these speed-change pulleys. Among these, those with a hydraulic thrust device generally have a hydraulic cylinder installed on the back of each movable pulley piece, and the amount of hydraulic oil supplied into this cylinder is controlled by an electronic control device. No.
It is disclosed in specification No. 4601680. In addition, a variable speed pulley using centrifugal force has a variable speed V pulley consisting of a fixed V pulley piece and a movable pulley piece as typified by Japanese Patent Publication No. 51-6815, and has a surrounding plate on the back of the movable pulley piece. It has a structure in which a weight is housed inside it, which moves due to centrifugal force when rotating, moves the movable pulley piece in the axial direction relative to the fixed pulley piece, and changes the effective diameter of the pulley. Steel balls are generally used as weights, and usually have a radial guide attached to them, into which the balls are inserted one by one, and as the pulley rotates, the balls move in the radial direction along the guide groove. I'm starting to do that. Note that when the centrifugal force thrust variable speed pulley is used as an input shaft, a variable speed pulley in which a coil spring is interposed at the back of a movable pulley piece is usually attached to the output shaft. On the other hand, there is also a continuously variable transmission device that is equipped with a fluid reservoir that rotates with the rotating shaft separately from each of the above-mentioned speed change pulleys, and controls the speed change rate by sensing changes in the flow rate of the fluid in the reservoir using a pitot tube. It has been proposed at the time. (Refer to Japanese Unexamined Patent Publication No. 59-222660) (Problem to be solved by the invention) However, in the upper transmission using the hydraulic system, the oil amount is controlled by the electronic control device. The amount of data to be imported is large,
Furthermore, since a large number of sensors must be attached, there is a problem that the device becomes expensive. In addition, in a device in which the centrifugal thrust type variable speed pulley is attached to the input shaft, the thrust of the movable pulley piece necessary for changing speed cannot be obtained, especially in the low rotation range, and conversely, in the high rotation range, the rotation speed of the pulley increases to the square of the rotation speed. There was a problem in that the centrifugal force of the group of steel balls increased proportionally and excessive thrust was generated. Therefore, when the belt transmits power from the input side to the output side, it is necessary to increase the input shaft rotation speed and the pulley diameter to gradually increase the increase in thrust as the pulley rotation speed increases. Therefore, it is difficult to put conventional transmission devices into practical use in the low rotation range.
It was also necessary to make the speed change pulley itself larger. Furthermore, in this device, the resistance that changes the V-groove width between the fixed pulley piece and the movable pulley piece is a factor, and the change in centrifugal force is delayed relative to the change in input rotation, resulting in a delay in response. The curve showing the change in output rotational speed relative to the input rotational change during deceleration and deceleration largely deviates, resulting in a shift characteristic that causes hysteresis loss. Therefore, if a transmission device that generates such hysteresis loss is used in a vehicle body, even if the input shaft rotation speed is the same, the output shaft rotation speed will be different, resulting in a lack of safety and operability. On the other hand, devices that sense the velocity of fluid in a fluid reservoir that rotates with the rotating shaft use a pitot tube as a means of sensing the flow velocity. It was a straight tube, with the tip cut at an angle of about 45 degrees, and its cross section was shaped like a vertically extending diamond or boat, so the flow velocity was slow near the center of the shaft and fast near the outer periphery. However, it was not possible to obtain high fluid pressure. The present invention solves various conventional problems as described above, and in particular, by sensitively changing the thrust of the variable speed pulley according to the rotation speed of the shaft, the hysteresis loss can be reduced in the rotation speed of the input shaft and output shaft. An object of the present invention is to provide a belt type continuously variable transmission device and a speed change pulley that have a small speed change characteristic and can obtain high fluid pressure by changing the shape of a pitot tube. (Means for Solving the Problems) That is, the present invention to meet the above object includes fixed pulley pieces on the input shaft and the output shaft, and a structure that is slidable in the longitudinal direction on the shaft in opposition to the fixed pulley pieces. In a belt type continuously variable transmission device, a variable speed pulley consisting of movable pulley pieces is provided, and a power transmission belt is hung in a V-shaped groove formed by these pulley pieces. A hydraulic cylinder part is provided on the back of the movable pulley piece, and a fluid reservoir part is provided on the outer periphery of the back of the fixed pulley piece.
A topi tube connected to the hydraulic cylinder and having a flat shape with an opening parallel to the cylindrical circumferential surface of the fluid reservoir is inserted into the fluid reservoir, and the pitot tube is connected to the lever connected to the throttle of the engine. The structure is such that it can swing around a rotary joint in response to rotation, and the position of the opening in the radial direction of the fixed pulley piece and the angle with respect to the fluid flow direction can be changed. Further, the present invention provides a configuration of the variable speed pulley itself forming the above-mentioned continuously variable transmission, which is composed of a fixed pulley piece and a movable pulley piece provided so as to be slidable in the axial direction opposite to the fixed pulley piece, and the back of the fixed pulley piece. A fluid reservoir is fixed to the movable pulley piece, and a hydraulic cylinder is provided on the back of the movable pulley piece, and the movable pulley piece is driven by the cylinder. A pitot tube having a flat shape parallel to the cylindrical circumferential surface of the fluid reservoir is inserted, and the pitot tube swings around a rotary joint in response to the rotation of a lever connected to the engine throttle. However, it is also characterized by a configuration in which the position of the opening in the radial direction of the fixed pulley piece and the angle with respect to the fluid flow direction can be changed. In each of the above configurations, it is desirable that the pitot tube has a streamlined cross-sectional shape with respect to the flow of fluid within the fluid reservoir so that the pitot tube does not obstruct the flow of fluid flowing within the fluid reservoir.
Further, in order to further increase the fluid pressure obtained by the pitot tube, the shape of the pitot tube is preferably a curved tube with little pressure loss. Further, in the above configuration, the present invention provides a hydraulic pressure generation source completely separate from the fluid reservoir of the pitot tube, connects this hydraulic pressure generation source to the hydraulic cylinder via a pressure control valve, and connects the pitot tube to the pressure control valve. It is also characterized by a configuration in which the pressure control valve is connected to the pitot tube and the hydraulic cylinder is operated by operating the pressure control valve in response to changes in the pitot tube. In the present invention, a coil spring is interposed between the movable pulley piece disposed on the output shaft and the stopper provided on the back of the movable pulley piece, and the movable pulley piece and the extension cylindrical part are inclined at one side. The present invention also provides a belt-type continuously variable transmission comprising a torque transmitting section having a protrusion having a surface and a recess that meshes with the protrusion on the other side, and a cam mechanism in which the protrusion and the inclined surfaces of the recess are brought into contact with each other. include. (Function) According to the device of the present invention, first, when the input shaft or the output shaft rotates, the pitot tube sensitively senses changes in the flow velocity and pressure of the fluid in the fluid reservoir according to the rotation speed, and transfers the fluid to the hydraulic cylinder. The thrust of the movable pulley piece is adjusted in a timely manner by supplying or discharging it to the outside, and the thrust of the movable pulley piece of the output shaft also changes sensitively due to the operation of a torque transmission section having a spring and cam mechanism. to instantly change the rotation speed of the output shaft. Furthermore, even when the input rotation is accelerated or decelerated, the pitot tube promotes changes in the internal pressure of the hydraulic cylinder in response to changes in the rotation speed of the input shaft, increasing the sensitivity to changes in the internal pressure of the hydraulic cylinder. Shift characteristics with small hysteresis loss can be achieved. Furthermore, by making the shape of the opening of the flow velocity sensing member into a flat shape parallel to the circumferential cylindrical surface of the fluid reservoir, it receives fluid at the same flow velocity.
High fluid pressure can be obtained by placing the apertures as close as possible to the circumferential surface. (Embodiments) Hereinafter, embodiments of the present invention will be further described with reference to the accompanying drawings. FIG. 1 is a sectional view showing an example of a belt type continuously variable transmission according to the present invention. The belt-type continuously variable transmission device 1 of the present invention is mainly applied to a continuously variable transmission mechanism (CVT) installed in automobiles, etc., and as is clear from the figure, it is indirectly connected to the crankshaft of an engine, etc. input shaft (drive shaft) 2 and output shaft (driven shaft)
3 are arranged in parallel, and transmission pulleys 4 and 5 are attached to these shafts 2 and 3, respectively, and a power transmission belt B is suspended between the attached transmission pulleys 4 and 5. Here, each variable speed pulley 4, 5 is a fixed pulley 6,
36 and movable pulley pieces 8 and 38 which are arranged so as to be slidable relative to the fixed pulley, and the power transmission belt B is suspended in a V-shaped groove formed by both pulley pieces. ing. Of these, in the variable speed pulley 4 attached to the input shaft 2, the fixed pulley piece 6 is attached to the bolt 7.
(Or, although not shown, a spline, key or other method may be used) to fix the input shaft 2 to the input shaft 2,
On the other hand, in a position opposite to this, a movable pulley piece 8 is fitted onto the sheave shaft 9 of the fixed pulley piece, and at the same time is fitted into a spline or sliding key 10, and the shaft 2
The shaft rotates with the shaft and is slidable in the axial direction. A ring-shaped fluid reservoir 11 is provided on the outer periphery of the back of the fixed pulley piece 6 of the speed change pulley 4, and the tip opening 13 of at least one pitot tube 12 is inserted into this fluid reservoir 11. It has been inserted. The pitot tube 12 senses the speed and pressure of the fluid in the fluid reservoir 11, which changes according to the rotation speed of the fixed pulley piece 6, and is fixed to the housing 14 of the belt type transmission 1. 6
It is connected to a rotary joint 15 on the back side of the tube, which allows the tube to be rotated in a plane parallel to the plane of the fixed pulley piece 6. The rotary joint 15 is provided with a pair of miter gears 60 and 60' at one end, and one end of the miter gear 60' is connected to the housing.
4 is provided with a rotating shaft 61 that projects outside the housing 14, and a rotating shaft 61 that projects outside the housing 14.
A lever 62 is fixed to the end of the engine, and the lever 62 is connected to the throttle of the engine by a wire (not shown). gear 6
0,60', the rotary joint 15 rotates, the pitot tube rotates, and the position of the opening 66 at the tip of the arm portion 70 shown in FIG. 2 moves. On the other hand, the movable pulley piece 8 is provided with a hydraulic cylinder 16 at its back. This hydraulic cylinder 16 consists of a fixed plate 17 fixed to the sheave shaft 9 of the fixed pulley piece and a cylindrical side wall 1 of the movable pulley piece.
The movable pulley piece 8 is made movable in the direction of the arrow by changing the internal pressure by supplying and discharging hydraulic oil or other fluid serving as a pressure medium. Of course, a backing may be attached to the top surface of the fixing plate 17. The spring 63 is inserted in a compressed state into the space formed by the fixed plate 17 and the cylindrical side wall 18 so as to press the movable pulley piece 8 toward the fixed pulley piece 6 . The hydraulic cylinder 16 is communicated with one end of the input shaft 2 via a fluid passage 19 provided within the input shaft 2, and opens into a cavity 64 provided in the bearing portion of the housing 14. The cavity 64 of the housing 14 is connected to the rotary joint 15 by a hydraulic hose 65 or a passage in the case as shown in the figure, and the hydraulic cylinder 16 and the pitot tube 12 are connected to the fluid passage 19,
It is connected to the pitot tube 12 and the fluid reservoir 11 by a series of hydraulic circuits consisting of a cavity 64, a hydraulic hose 65, and a rotary joint 15. Therefore, the fluid in the fluid reservoir 11 flows in and out through the opening 13 at the tip of the pitot tube 12, and the internal pressure of the hydraulic cylinder 16 is constantly adjusted according to the rotation speed of the input shaft 2. Further, the fluid reservoir section 11 has a fluid supply section 20 that constantly replenishes fluid. The fluid is collected into the fluid reservoir 11 through the fluid supply port 25 by the pump 24, and the fluid is always recycled. Note that the fluid overflowing from the fluid reservoir 11 naturally falls. Next, in the variable speed pulley 5 attached to the output shaft 3, on the one hand, a fixed pulley piece 36 is integrally fixed to the output shaft 3 within the housing 21, and on the other hand, a movable pulley piece 38 is fixed to the fixed sheave so as to face this. A V-shaped groove is formed on the sheave shaft 39 of the piece to engage the belt B. The movable pulley piece 38 is slidable on the fixed sheave piece and the sheave shaft 39 and is movable in the axial direction, but there is a flange on the sheave shaft 39 on the right side of the movable pulley piece 38. A shaped stopper 40 is fixed by a bolt 41, and between the stopper 40 and the movable pulley piece 38, a coil spring 42 having rebound elasticity always presses the movable pulley piece 38 in the direction of the fixed pulley piece 36. It is attached with. In the figure, 50 is a torque transmitting part, and as shown in FIG. 8, the extended cylindrical part 43 of the movable pulley piece has at least one protrusion 44, and the side surface of this protrusion extends in the longitudinal direction. In contrast, the inclined surfaces 45 have angles θ ₁ and θ ₂ (approximately 20° to 70°, respectively). In this case, θ ₁ and θ ₂ usually have a difference, but may be equal. On the other hand, the extension cylindrical portion 46 of the stopper is engaged with a recessed portion 48 having an inclined surface 47 that abuts the inclined surface 45 on the side surface of the protruding portion 44, and the respective inclined surfaces 45 and 47 are engaged with each other. Due to the contact, a thrust is generated in the movable pulley piece 38, and the movable pulley piece 38 forms a torque transmission section 50 with a cam mechanism that transmits torque to the output shaft 3. That is, when the movable pulley piece 38 rotates, the protruding part 44 of the movable pulley piece and the recessed part 48 of the stopper mesh with each other and come into contact with each other on the inclined surfaces 45 and 47, and the torque of the movable pulley piece 38 is transferred from the stopper 40 to the output shaft 3. transmitted to. Further, the torque transmission section 50
The axial component force and spring force generated from the engagement force between the inclined surfaces of the movable pulley piece 38 provide an efficient thrust force to the movable pulley piece 38. In the belt-type continuously variable transmission as described above, the present invention has an important feature in particular in a series of configurations including the fluid reservoir 11 and the pitot tube 12. It is important to obtain as high a pitot pressure as possible in order to directly use the pitot pressure thus obtained to operate the hydraulic cylinder 16. Therefore, in the present invention, as shown in FIGS. 2 to 5, the opening 6 at the tip of the pitot tube 12 is
6 is a flat shape parallel to the cylindrical circumferential surface of the fluid reservoir 11. Therefore, when a high pitot pressure is required, by bringing the opening 66 of the pitot tube 12 close to the outer circumferential surface of the fluid reservoir 11, the fluid pressure of only the portion where the flow rate is high can be received, and a high pitot pressure can be obtained. becomes possible. Further, in order to prevent pressure loss in the pitot tube 12, it is preferable to bend the pitot tube 12 into an arc shape as shown in FIG. degree is suitable. Furthermore, it is effective to form a streamlined shape for the fluid as shown in the cross-sections of FIGS. 4 and 5 so as not to obstruct the flow of the fluid reservoir 11. Specifically, the differences in fluid pressure depending on the shape of the pitot tube 12 are as follows. That is, the curved pitot tube 12 of the present invention, which has a streamlined cross section and whose openings are oriented perpendicular to the flow, as shown in FIGS. The Pitot tube 12a is a straight tube with a diamond-shaped cross section inserted vertically, and the pitot tube 12a has its tip cut off at an angle of 45 degrees, and the shape is the same as in Figure 6, except that the cross section is boat-shaped as shown in Figure 7. For the three types of Pitot tubes 12b, the distance from the center of the shaft to the outer circumference of the fluid is 158 mm, the width is 30 mm, and the height is 29 mm.
When they were inserted at 0.5 mm and the maximum pitot pressure obtained was measured, the results shown in Table 1 below were obtained. Note that oil (Nisseki Malpus #10) was used as the fluid, and the rotation was set to 2600 rpm.

【表】即ち、上記第１表より分かるように、第３図な
いし第５図に示す形状のピトー管１２を使用した
場合、その他の形状のものよりも高いピトー圧が
得られる。これは、第６図、第７図に示される形のものが
開孔が縦長になつており、流速の速いところと、
遅いところの両方を受けるのに対し、第３図ない
し第５図に示される本発明におけるピトー管形状
は開口が偏平状であり、流速の速いところだけを
受けるためであると推定される。以下、引き続き本発明の上記ベルト式無段変速
装置１の作動について説明する。まず、入力軸２
が回転し、その回転数が小さい領域ではピトー管
１２で感知する流体の速度、圧力が小さいため油
圧シリンダー１６の内圧も小さくなつて可動プー
リ片８はスプリング６３のみの小さい推力で押圧
される。それに対して出力軸３にかかるトルクは
大きく、この軸に取り付けられた片速プーリ５に
おける可動プーリ片３８はカム機構付のトルク伝
達部５０によつて生じる軸方向の分力とスプリン
グ力によつて大きな推力が発生し、ベルトＢを両
プーリ間の所定位置におさめる。更に入力軸側が大きく増速する過程では、それ
につれてピトー管１２は増加する回転数に応じた
流速と圧力を感知して流体を油圧シリンダー１６
内へ供給して油圧シリンダー１６の内圧を高め、
これにより可動プーリ片８の推力を大きくしてベ
ルトＢを所定のピツチ径へ位置させる。また一方、入力軸側の減速時には油圧シリンダ
ー１６内の内圧がピトー管１２が感知される圧力
よりも大きくなつて油圧シリンダー１６内の流体
は主としてピトー管１２の先端開口部１３より排
出され、油圧シリンダー１６は入力軸２の回転数
に応じた内圧に設定され、ベルトＢは所定のピツ
チ径へタイムリーに移動する。なお、排出された流体はハウジング１４内に溜
められ再利用される。尚、油圧シリンダー１６内のスプリング６３
は、可動プーリ片８の動作を補助し、加速曲線を
より直線的な理想的な状態に設定する作用を行
う。ただし、所要変速巾が狭い場合は上記スプリン
グ６３は必らずしも必要としない。以上のように、本発明のベルト式変速装置は、
入力軸の回転数および出力軸の受ける負荷に対応
して、油圧シリンダー内の内圧が変化し、適切な
変速比を得ることができる。そして、更に、上記実施例においてレバー６２
を回転すれば、ピトー管１２が、ロータリージヨ
イント１５を中心に揺動し、開孔６６の固定プー
リ片半径方向の位置および流体の流れ方向に対す
る角度が変化する。そのため、レバー６２を操作
することによつて入力軸の回転に対する油圧シリ
ンダー１６内の油圧シリンダー１６圧変化の感度
を調整することができる。現実にはさきで述べた
ようにレバー６２はアクセルに連動され、アクセ
ルが通常踏み込み状態の時、即ち、巡航状態の時
は第２図の実線の位置に配され、アクセルの踏み
込み量が大きい時、即ち急加速時には破線の位置
へ配される。流体溜め部１１内の流体の流れは矢
印のように流体溜め部１１の周方向に一致する。また、その流速は外周方向ほど速い。そのた
め、アクセルの踏み込み量が大きい時、ピトー管
１２の開孔６６は作動油の流れの速いところにお
かれる。それ故にピトー管１２で得られる油圧は
大きいものになり、油圧シリンダー１６内の圧力
もそれに応じて大きくなり、可動プーリ片８は固
定プーリ片６に近づく方向に移動する。以上、実施例においてピート管の開孔を油溜め
内で移動させる手段としては、ロータリージヨイ
ントを用いてピトー管を回転させる手段を用い
た。これはピトー管の流れに対する角度および半径
方向の位置を同時に変更できるものであり、好ま
しい状態である。しかし、この他の態様としては
ピトー管を直線ガイドに取り付け、そのガイドを
可動プーリ片の半径方向に配し、ピトー管をガイ
ドに沿つて平行移動させる手段も可能である。この手段はピトー管の流れに対する角度を変え
ることなく半径方向の位置のみを変化させるもの
であるが、逆にピトー管のアーム部分（第２図に
おいては７０）を短くすることによつて流れに対
する角度のみを変更するもとも可能である。第９図はピトー管を流体溜め部内で移動させる
機構の他の実施例を示す。この第９図の機構は特
に回転数の上昇に対するプーリ片の移動量を直線
的に変化させたい場合に推奨される。第９図の機
構においては、ピトー管１００はロータリージヨ
イント１０１によつて流体溜め部１０２内で自由
に揺動可能に取り付けられている。そして、上記ロータリージヨイント１０１には
ワイヤー１０３，１０４が懸掛され、ワイヤー１
０３，１０４を引くことによつてロータリージヨ
イント１０１は揺動する。この場合、ワイヤー１
０３はスプリング１０５を介してシフトレバー１
０８に接続され、ワイヤー１０４はスプリング１
０６を介してアクセル（図示せず）に接続されて
いる。今、第９図の機構においてプーリが比較的低回
転で回転しスプリング１０５，１０６のバランス
によつてピトー管は実線の位置にあると仮定す
る。このままの状態でプーリ回転数が上昇すると
ピトー管が感知するピート圧は上昇するが、この
圧力は回転数の二乗に比例した値となる。しかし、第９図の機構においては流速の増加に
よつてピトー管が流れ方向に押圧されピトー管が
破線の位置へ移動する。そのため、ピトー管の開
孔１０７は流れに対してより平行である面を向い
て対向しピトー管の開孔係数は低下する。そのた
め、ピトー管のピトー圧は減少し遠心力の圧力の
上昇と相俟つてピトー圧は回転数に比例した値に
近い値をもつて変動する。（発明の効果）以上のように本発明の構成によれば、入力軸又
は出力軸に装着して変速プーリのピトー管が流体
溜め部内の流体の速度から圧力を敏感に感知して
油圧シリンダー内外へ流体の供給、排出を自動的
に行う機構を有しており、これによつて可動プー
リ片の推力を入力軸又は出力軸の回転数に応じて
即座に変化させる特性があり、これによつて入力
軸の増速時と減速時における出力軸の回転数の変
化曲線も大きく変化せず、ヒステリシスロスの小
さい変速特性が得られる。更に、本発明のベルト式変速装置は、ピトー管
の開孔の位置を移動することができるので、ピト
ー管の感度を負荷の状態に応じて変化させること
ができ、より実用的効果を大ならしめる。また、請求項２，３あるいは５，６記載の如く
ピトー管の形状を開孔が流体の流れに対向するよ
うにし、偏平形状にすることによつて流速の速い
ところのみの流体を受けることができることにな
り、より高いピトー圧を得ることができ、油圧シ
リンダーの油圧源としても十分な油圧を得ること
ができる効果がある。[Table] That is, as can be seen from Table 1 above, when the pitot tube 12 having the shape shown in FIGS. 3 to 5 is used, a higher pitot pressure can be obtained than those having other shapes. This is because the holes in the shape shown in Figures 6 and 7 are vertically elongated, and the flow velocity is high.
It is presumed that this is because the Pitot tube shape of the present invention shown in FIGS. 3 to 5 has a flat opening, and receives only the portion where the flow velocity is high, whereas the Pitot tube shape of the present invention shown in FIGS. The operation of the belt-type continuously variable transmission 1 of the present invention will be explained below. First, input shaft 2
rotates, and in a region where the number of rotations is small, the velocity and pressure of the fluid sensed by the pitot tube 12 are small, so the internal pressure of the hydraulic cylinder 16 is also small, and the movable pulley piece 8 is pressed by a small thrust of the spring 63 alone. On the other hand, the torque applied to the output shaft 3 is large, and the movable pulley piece 38 of the single-speed pulley 5 attached to this shaft is moved by the axial component force and spring force generated by the torque transmission section 50 with a cam mechanism. As a result, a large thrust is generated, and belt B is held in a predetermined position between both pulleys. Furthermore, in the process of greatly increasing speed on the input shaft side, the pitot tube 12 senses the flow velocity and pressure corresponding to the increasing rotational speed and directs the fluid to the hydraulic cylinder 16.
to increase the internal pressure of the hydraulic cylinder 16,
This increases the thrust of the movable pulley piece 8 to position the belt B to a predetermined pitch diameter. On the other hand, when the input shaft side decelerates, the internal pressure in the hydraulic cylinder 16 becomes greater than the pressure sensed by the pitot tube 12, and the fluid in the hydraulic cylinder 16 is mainly discharged from the tip opening 13 of the pitot tube 12, causing the hydraulic pressure to increase. The internal pressure of the cylinder 16 is set according to the rotational speed of the input shaft 2, and the belt B moves to a predetermined pitch diameter in a timely manner. Note that the discharged fluid is stored in the housing 14 and reused. Furthermore, the spring 63 inside the hydraulic cylinder 16
assists the movement of the movable pulley piece 8 and functions to set the acceleration curve to a more linear ideal state. However, if the required shift width is narrow, the spring 63 is not necessarily required. As described above, the belt type transmission device of the present invention has the following features:
The internal pressure within the hydraulic cylinder changes in response to the rotational speed of the input shaft and the load applied to the output shaft, making it possible to obtain an appropriate gear ratio. Furthermore, in the above embodiment, the lever 62
When rotated, the pitot tube 12 swings around the rotary joint 15, and the position of the aperture 66 in the radial direction of the fixed pulley piece and the angle with respect to the fluid flow direction change. Therefore, by operating the lever 62, the sensitivity of the pressure change in the hydraulic cylinder 16 to the rotation of the input shaft can be adjusted. In reality, as mentioned above, the lever 62 is linked to the accelerator, and when the accelerator is normally depressed, that is, when the vehicle is in a cruising state, it is located at the position shown by the solid line in FIG. 2, and when the accelerator is depressed by a large amount, , that is, at the time of sudden acceleration, it is placed at the position indicated by the broken line. The flow of fluid within the fluid reservoir 11 coincides with the circumferential direction of the fluid reservoir 11 as shown by the arrow. Further, the flow velocity is faster toward the outer circumference. Therefore, when the amount of depression of the accelerator is large, the opening 66 of the pitot tube 12 is located at a location where the hydraulic oil flows quickly. Therefore, the hydraulic pressure obtained in the pitot tube 12 becomes large, and the pressure within the hydraulic cylinder 16 also increases accordingly, causing the movable pulley piece 8 to move in a direction approaching the fixed pulley piece 6. As described above, in the examples, a means for rotating the pitot tube using a rotary joint was used as a means for moving the opening of the pitot tube within the oil reservoir. This is a preferable situation because it allows the angle and radial position of the pitot tube with respect to the flow to be changed at the same time. However, as another embodiment, it is also possible to attach the pitot tube to a linear guide, arrange the guide in the radial direction of the movable pulley piece, and move the pitot tube in parallel along the guide. This method changes only the radial position of the pitot tube without changing its angle with respect to the flow, but conversely, by shortening the arm portion (70 in Fig. 2) of the pitot tube, the angle of the pitot tube with respect to the flow can be changed. It is originally possible to change only the angle. FIG. 9 shows another embodiment of the mechanism for moving the pitot tube within the fluid reservoir. The mechanism shown in FIG. 9 is particularly recommended when it is desired to linearly change the amount of movement of the pulley piece as the rotational speed increases. In the mechanism shown in FIG. 9, a pitot tube 100 is attached by a rotary joint 101 so as to be freely swingable within a fluid reservoir 102. Wires 103 and 104 are hung on the rotary joint 101, and the wire 1
By pulling 03 and 104, the rotary joint 101 swings. In this case, wire 1
03 is the shift lever 1 via the spring 105.
08, wire 104 is connected to spring 1
06 to an accelerator (not shown). Assume now that in the mechanism shown in FIG. 9, the pulley rotates at a relatively low rotational speed and the pitot tube is positioned as shown by the solid line due to the balance between the springs 105 and 106. If the pulley rotation speed increases in this state, the peat pressure sensed by the pitot tube will increase, but this pressure will have a value proportional to the square of the rotation speed. However, in the mechanism shown in FIG. 9, the pitot tube is pushed in the flow direction due to the increase in flow velocity, and the pitot tube moves to the position indicated by the broken line. Therefore, the apertures 107 of the pitot tube face each other in a plane that is more parallel to the flow, and the aperture coefficient of the pitot tube decreases. Therefore, the pitot pressure of the pitot tube decreases, and together with the increase in the pressure of centrifugal force, the pitot pressure fluctuates at a value close to a value proportional to the rotation speed. (Effects of the Invention) As described above, according to the configuration of the present invention, the pitot tube of the speed change pulley is attached to the input shaft or the output shaft, and sensitively senses the pressure from the velocity of the fluid in the fluid reservoir, thereby controlling the inside and outside of the hydraulic cylinder. It has a mechanism that automatically supplies and discharges fluid to and from the pump, and has the characteristic of instantly changing the thrust of the movable pulley piece according to the rotation speed of the input shaft or output shaft. Therefore, the change curve of the rotational speed of the output shaft when the input shaft speeds up and when it decelerates does not change significantly, and a speed change characteristic with small hysteresis loss can be obtained. Furthermore, since the belt-type transmission of the present invention can move the position of the hole in the pitot tube, the sensitivity of the pitot tube can be changed according to the load condition, which increases practical effects. Close. In addition, as described in claims 2, 3 or 5, 6, the shape of the pitot tube is such that the opening faces the fluid flow, and by making the pitot tube a flat shape, it is possible to receive fluid only in areas where the flow velocity is high. As a result, a higher pitot pressure can be obtained, and sufficient oil pressure can also be obtained as a hydraulic pressure source for a hydraulic cylinder.

[Brief explanation of drawings]

第１図は本発明に係るベルト式無段変速装置の
断面図、第２図は第１図のＡ−Ａ断面図、第３図
は本発明装置におけるピトー管の形状例を示す斜
視図、第４図は第３図における−断面図、第
５図は第３図における−断面図、第６図及び
第７図はそれぞれ比較する直管のピトー管形状を
示す斜視図、第８図は出力軸に取り付けた変速プ
ーリの可動プーリ片とストツパー間のカム機構付
のトルク伝達部の斜視図、第９図はピトー管の移
動機構の他の実施例を示す機構図である。１……ベルト式無段変速装置、２……入力軸、
３……出力軸、４，５……変速プーリ、６，３６
……固定プーリ片、８，３８……可動プーリ片、
１１，１０２……流体溜め部、１２，１００……
ピトー管、１５……ロータリージヨイント、１６
……油圧シリンダー、２０……流体供給部、４０
……ストツパー、４２……コイルスプリング。 FIG. 1 is a sectional view of a belt type continuously variable transmission according to the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a perspective view showing an example of the shape of a pitot tube in the device of the present invention. Fig. 4 is a sectional view of Fig. 3, Fig. 5 is a sectional view of Fig. 3, Figs. 6 and 7 are perspective views showing pitot tube shapes of straight pipes for comparison, and Fig. 8 is a sectional view of Fig. 3. A perspective view of a torque transmission section with a cam mechanism between a movable pulley piece of a speed change pulley attached to an output shaft and a stopper, and FIG. 9 is a mechanical diagram showing another embodiment of a pitot tube moving mechanism. 1... Belt type continuously variable transmission, 2... Input shaft,
3... Output shaft, 4, 5... Speed change pulley, 6, 36
...Fixed pulley piece, 8,38...Movable pulley piece,
11,102...fluid reservoir, 12,100...
Pitot tube, 15...Rotary joint, 16
... Hydraulic cylinder, 20 ... Fluid supply section, 40
...Stopper, 42...Coil spring.

Claims

[Scope of Claims] 1. A variable speed pulley consisting of a fixed pulley piece and a movable pulley piece disposed so as to be slidable in the longitudinal direction of the shaft in opposition to the fixed pulley piece is attached to the input shaft and the output shaft, respectively. In a belt-type continuously variable transmission device in which a power transmission belt is suspended across a V-shaped groove formed by both pulley pieces of both speed change pulleys,
A hydraulic cylinder part is formed on the back of the movable pulley piece disposed on the input shaft or the output shaft, and a fluid reservoir part is formed on the outer periphery of the back part of the fixed pulley piece, and the fluid reservoir part communicates with the hydraulic cylinder. A pitot tube is inserted into the pitot tube, the opening at the tip of which has a flat shape parallel to the cylindrical surface of the fluid reservoir, and the pitot tube moves into a rotary joint according to the rotation of a lever connected to the engine throttle. 1. A belt-type continuously variable transmission device that swings around the center and can change the radial position of the fixed pulley piece of the opening and the angle with respect to the fluid flow direction. 2. The belt type continuously variable transmission according to claim 1, wherein the pitot tube has a cross-sectional shape that is streamlined with respect to the flow of fluid in the fluid reservoir. 3. The belt type continuously variable transmission according to claim 1 or 2, wherein the pitot tube has a curved shape. 4 Consists of a fixed pulley piece and a movable pulley piece that can slide in the axial direction opposite to the fixed pulley piece, a fluid reservoir is fixed to the fixed pulley piece, while the movable pulley piece is driven by a cylinder. At the same time, a pitot tube communicating with the hydraulic cylinder and having a flat shape with an opening at the tip parallel to the cylindrical circumferential surface of the fluid reservoir is inserted into the fluid reservoir, and the pitot tube is connected to the engine. A speed change pulley, characterized in that it can swing around a rotary joint in response to the rotation of a lever linked to a throttle, and can change the position of the opening in the radial direction of one of the fixed pulleys and the angle with respect to the fluid flow direction. 5. The variable speed pulley according to claim 4, wherein the pitot tube has a cross-sectional shape that is streamlined with respect to the flow of fluid within the fluid reservoir. 6. The variable speed pulley according to claim 4 or 5, wherein the pitot tube has a curved shape. 7 Consists of a fixed pulley piece and a movable pulley piece that can slide in the axial direction opposite to the fixed pulley piece, a fluid reservoir is fixed to the fixed pulley piece, while the movable pulley piece is driven by a hydraulic cylinder. At the same time, a pitot tube having a flat opening shape at the tip parallel to the cylindrical circumferential surface of the fluid reservoir is inserted into the fluid reservoir, and the pitot tube is rotated by the rotation of a lever linked to the throttle of the engine. The rotary joint can be swung around the rotary joint to change the radial position of one of the fixed pulleys and the angle with respect to the fluid flow direction, and the pitot pipe is connected to the pressure control valve of the hydraulic cylinder. A speed change pulley characterized in that the pressure control valve is operated in response to changes in pressure in a pipe.