JPH0617901A - Transmission - Google Patents

Abstract

PURPOSE:To improve the general purpose of a transmission provided with a frictional type continuously variable transmission(CVT) by structuring the CVT part separably from a transmission gear part, and enabling application of the CVT part to a plurality of different transmission devices. CONSTITUTION:A transmission is composed of a CVT part A and a transmission device part B which are detachably connected. The CVT part A has a plurality of tapered cones 2 revolving around a main shaft 1 having a cooling fan Fa on its end, and consists of a transmission part 4 which brings an axially shiftable ring-like transmission member 3 into external contact with the tapered cones 2, and of a cylindrical output rottional body 5 which is fitted on the main shaft 1 in a relatively rotatable manner. The transmission device B is formed by loosely fitting a transmission rotational body 13 which can be interlocked with the output rotational body 5 on a transmission shaft 12 which is interlocked with the main shaft 1, and by equipping a transmission case 15 with a normal/reverse rotation switching mechanism 14 which takes the rotation of the transmission rotational body 13 in normal and reverse rotational manners.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、摩擦式無段変速装置
〔Ｃｏｎｔｉｎｕｏｕｓ ＶａｒｉａｂｌｅＴｒａｎｓ
ｍｉｓｓｉｎ（以下、ＣＶＴと略称する）〕を備えた変
速装置に係り、詳しくは、各種の作業機や農機の変速装
置として利用し易いように構成されたものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction type continuously variable transmission (Continuous Variable Trans).
The present invention relates to a transmission equipped with a miss (hereinafter abbreviated as CVT)], and more particularly, to a transmission configured to be easily used as a transmission for various work machines and agricultural machines.

【０００２】[0002]

【従来の技術】この種の変速装置としては、特開平３−
１７７６４９号公報に示されたバインダーの変速装置の
ように、ミッションケース中に減速機構やＣＶＴや正逆
転切換機構等を内装した一体型のものが知られている。2. Description of the Related Art As a transmission of this type, Japanese Patent Laid-Open No.
There is known an integral type transmission device such as a binder transmission device disclosed in Japanese Patent Publication No. 177649 that has a reduction gear mechanism, a CVT, a forward / reverse switching mechanism and the like in a transmission case.

【０００３】[0003]

【発明が解決しようとする課題】ＣＶＴは比較的コンパ
クトで廉価に無段の変速動力を取出すことができる装置
として、近年、その利用計画が増えつつある。上記のも
のでは変速装置全体としての大きさを比較的コンパクト
にできる利点を備えてはいるが、バインダー用に作られ
ているために小型の乗用型芝刈機等の他の機種にそのま
ま適用させることが困難であり、別途、ＣＶＴ付きのミ
ッションを作成することになる。しかしながら、原動機
の出力が同じ位である場合では伝達トルクの点からＣＶ
Ｔ自体は共通に使用することが可能であるから、機種毎
にＣＶＴを一体にミッションに組み込み設定することが
不合理であって汎用性に劣るように見受けられ、改善の
余地があるように思える。本発明の目的は、ＣＶＴを備
えた変速装置の構造を工夫することによって汎用性を持
たせる点にある。In recent years, the CVT has been increasing its use plan as a device which is relatively compact and can take out continuously variable transmission power at a low cost. Although the above has the advantage that the size of the transmission as a whole can be made relatively compact, it can be applied to other models such as small riding lawnmowers as it is because it is made for binders. Is difficult, and a mission with CVT will be created separately. However, if the output of the prime mover is about the same, CV is
Since T itself can be used in common, it seems that it is unreasonable and inferior in versatility to integrally set the CVT in the mission for each model, and there seems to be room for improvement. . An object of the present invention is to provide versatility by devising the structure of a transmission equipped with a CVT.

【０００４】[0004]

【課題を解決するための手段】上記目的の達成のために
本発明は、動力が入力される主軸の周囲に、該主軸の軸
心を中心として公転駆動される複数の回転体を配置し、
これら回転体に亘って軸心方向にシフト可能な変速部材
を接触して摩擦式無段変速部を設けるとともに、この変
速部の出力を取出す出力回転体を、主軸に相対回転自在
に外嵌する筒軸に構成してあるＣＶＴ部（摩擦式無段変
速装置部）と、主軸に連動連結可能な伝動軸に、出力回
転体に連動連結可能な変速回転体を相対回転自在に外嵌
し、変速回転体の回転を正及び逆転自在に取出す正逆転
切換機構を伝動ケース内に備え、かつ、伝動軸を伝動ケ
ース外に延出してある伝動装置部とを着脱可能に連結
し、主軸をＣＶＴ部を覆う変速ケース外に延出するとと
もに、その延出された部分の主軸に変速ケースを冷却す
る冷却ファンを取付けて変速装置を構成してあることを
特徴とする。In order to achieve the above object, the present invention provides a plurality of rotating bodies, which are revolvably driven around the shaft center of the main shaft, around the main shaft to which power is input,
A friction type continuously variable transmission portion is provided by contacting a transmission member capable of shifting in the axial direction across these rotating bodies, and an output rotating body for taking out the output of the transmission portion is fitted onto a main shaft so as to be relatively rotatable. A CVT portion (friction type continuously variable transmission portion) configured on a cylindrical shaft and a transmission shaft that can be interlockingly connected to a main shaft are externally fitted to a speed changing rotary member that can be interlockingly connected to an output rotary member, The transmission case is equipped with a forward / reverse switching mechanism that takes out the rotation of the speed-changing rotary body in forward and reverse directions, and the transmission shaft is detachably connected to the transmission unit extending outside the transmission case, and the main shaft is CVT. The transmission device is characterized in that it extends outside the transmission case that covers the portion, and a cooling fan that cools the transmission case is attached to the main shaft of the extended portion.

【０００５】[0005]

【作用】上記の特徴構成は、変速装置をＣＶＴ部とその
他の部、すなわち伝動装置部とに分割する考えである。
この分割式の変速装置によれば、ＣＶＴ部を単独で取り
扱うことが可能になるから、ＣＶＴを用いる他の機種に
は、伝動装置部を切り離した状態のＣＶＴ部と他の伝動
装置部との組み合わせによる他の機種用の変速装置を構
成することが可能になる。又、この変速装置では伝動装
置部の伝動軸がケース外に延出してあるので、例えば、
芝刈機におけるスウィーパの駆動軸に使うといった具合
に、外部動力の取出し軸として有効に利用できるように
なる。さらに、ＣＶＴ部では摩擦によって熱が発生する
が、変速ケース外に取出された主軸に冷却ファンを取付
けてあるから、減速される前の比較的高速回転で冷却フ
ァンを回して効率良くＣＶＴ部を冷却することができ
る。The above-mentioned characteristic structure is an idea of dividing the transmission into the CVT portion and the other portion, that is, the transmission portion.
According to this split type transmission, it is possible to handle the CVT section independently. Therefore, in other models using the CVT, the CVT section with the transmission section separated and the other transmission section are provided. It is possible to configure a transmission for other models by combining them. Further, in this transmission, since the transmission shaft of the transmission unit extends outside the case, for example,
It can be effectively used as a shaft for extracting external power, such as when it is used as the drive shaft of a sweeper in a lawn mower. Further, heat is generated due to friction in the CVT portion, but since the cooling fan is attached to the main shaft taken out of the gearbox case, the cooling fan is rotated at a relatively high speed before deceleration to efficiently drive the CVT portion. Can be cooled.

【０００６】[0006]

【発明の効果】従って、相対着脱自在なＣＶＴ部と伝動
装置部とで変速装置を構成する工夫によってＣＶＴ部を
複数の異なる変速装置に利用でき、良好な冷却性能を備
えながら汎用性に優れ、かつ、駆動型装置用の動力取出
し軸も備えた便利な変速装置を提供できた。As a result, the CVT portion can be used for a plurality of different transmission devices by devising the transmission device with the relatively removable CVT portion and the transmission device portion, and it is excellent in versatility while having excellent cooling performance. At the same time, it is possible to provide a convenient transmission that also includes a power take-off shaft for a drive type device.

【０００７】[0007]

【実施例】以下に、本発明の実施例を図面に基づいて説
明する。図１、図２にＣＶＴ部Ａと伝動装置部Ｂとで成
る変速装置が示されている。ＣＶＴ部Ａは、動力が入力
される主軸１の周囲に、該主軸１の軸心Ｐを中心として
公転駆動される複数のテーパコーン２（回転体に相当）
を配置し、これらテーパコーン２に亘って軸心方向にシ
フト可能なリング状の変速部材３を外接して変速部４を
設けるとともに、この変速部４の出力を取出す出力回転
体５を、主軸１に相対回転自在に外嵌する筒軸として設
けることによって構成されている。尚、６は、外側支持
板６Ａと内側支持板６Ｂと支持ピン６Ｃとで成るキャリ
ヤ、７は支持回転体、８は押圧板であり、この押圧板８
と出力回転体５とボール９とでテーパコーン２に作用す
る押圧機構１０が構成されるとともに、１１は押圧機構
１０での初期圧設定用のバネである。主軸１は変速ケー
ス２４外に延出され、その延出部には冷却ファンＦａが
取付けてあるとともに変速ケース２４には冷却フィン２
４ｆが形成され、ＣＶＴ部Ａで発生する熱を効率良く放
出するようにしてある。伝動装置部Ｂは、主軸１の右端
に連動連結可能な伝動軸１２に、出力回転体５に連動連
結可能な筒状の変速回転体１３を相対回転自在に外嵌
し、変速回転体１３の回転を正転及び逆転自在に取出す
正逆転切換機構１４と、デフ機構２１とを伝動ケース１
５内に備えて構成され、伝動軸１２の右端部は伝動ケー
ス１５外に延出してエンジン出力軸Ｅｓにカップリング
連結されている。変速回転体１３には駆動スプロケット
１３ａと駆動ギヤ１３ｂとが一体に備えてあり、変速軸
１６に遊外嵌される受動スプロケット１７、受動ギヤ１
８及び変速軸１６に一体回転状に外嵌されるシフト回転
体１９とチェン２０とで正逆転切換機構１４が構成され
ている。そして、変速軸１６の動力をギヤ減速してデフ
機構２１に伝達するとともに、デフ機構２１の左右の出
力軸２７，２７に後輪２８を取付けて動力ユニットに構
成してある。尚、２５は、さらに他の装置（洗車ポンプ
等）の駆動用として設けられた臨時ギヤであり、その部
分の伝動ケース１５を部分的に着脱式にしておくと便利
である。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a speed change device including a CVT part A and a transmission device part B. The CVT section A is composed of a plurality of tapered cones 2 (corresponding to a rotating body) that are revolved around a main shaft 1 to which power is input, around an axis P of the main shaft 1.
And a ring-shaped speed change member 3 capable of shifting in the axial direction over the taper cone 2 is externally provided to provide a speed change unit 4, and an output rotary body 5 for extracting the output of the speed change unit 4 is provided to the main shaft 1 It is configured by being provided as a cylindrical shaft that is fitted relatively rotatably to the outside. Incidentally, 6 is a carrier composed of an outer side support plate 6A, an inner side support plate 6B and a support pin 6C, 7 is a support rotor, and 8 is a pressing plate.
The output rotating body 5 and the ball 9 constitute a pressing mechanism 10 that acts on the tapered cone 2, and 11 is a spring for setting an initial pressure in the pressing mechanism 10. The main shaft 1 is extended to the outside of the transmission case 24, a cooling fan Fa is attached to the extended portion, and the cooling fin 2 is attached to the transmission case 24.
4f is formed so that the heat generated in the CVT portion A can be efficiently released. In the transmission device section B, a transmission shaft 12 that can be interlockingly connected to the right end of the main shaft 1 is fitted with a cylindrical speed changing rotor 13 that can be interlockingly connected to the output rotating body 5 so as to be rotatable relative to each other. The forward / reverse switching mechanism 14 for freely rotating the forward / reverse rotation and the differential mechanism 21 are included in the transmission case 1.
5, the right end portion of the transmission shaft 12 extends outside the transmission case 15 and is coupled to the engine output shaft Es by coupling. The variable speed rotating body 13 is integrally provided with a drive sprocket 13a and a drive gear 13b.
The forward / reverse switching mechanism 14 is composed of the shift rotor 19 and the chain 20 which are fitted onto the gearshift shaft 8 and the transmission shaft 16 so as to rotate integrally therewith. The power of the transmission shaft 16 is decelerated and transmitted to the differential mechanism 21, and rear wheels 28 are attached to the left and right output shafts 27, 27 of the differential mechanism 21 to form a power unit. Incidentally, 25 is a temporary gear provided for driving other devices (car wash pump or the like), and it is convenient to partially make the transmission case 15 of that part detachable.

【０００８】主軸１と伝動軸１２とはカップリング２２
を介して、かつ、出力回転体５と変速回転体１３とはそ
れらの軸端部に形成された爪部分５Ａ，１３Ａとによる
爪クラッチ部２３によって夫々軸方向への移動によって
係脱されるようにしてあるとともに、変速ケース２４と
伝動ケース１５とを出力回転体５部位において左右に分
割可能にボルト連結してある。つまり、この変速装置で
は、連結ボルト２６を外して軸心Ｐ方向に移動させれば
ＣＶＴ部Ａと伝動装置部Ｂとを分離することができる。
従って、これらを単品で使用したりあるいはＣＶＴ部Ａ
を他の伝動装置部と結合して使用するといった使い方が
可能になり、汎用性に富む変速装置として各種の作業車
や農機に用いることができるようになる。The main shaft 1 and the transmission shaft 12 are coupled to each other by a coupling 22.
And the output rotary body 5 and the variable speed rotary body 13 are engaged and disengaged by axial movements by the pawl clutch portion 23 by the pawl portions 5A and 13A formed at their shaft ends. In addition, the transmission case 15 and the transmission case 15 are bolted so as to be divided into right and left portions at the output rotary member 5. That is, in this transmission, the CVT portion A and the transmission portion B can be separated by removing the connecting bolt 26 and moving it in the axial center P direction.
Therefore, these can be used individually or in the CVT section A
Can be used in combination with other transmission devices, and can be used as a versatile transmission for various work vehicles and agricultural machines.

【０００９】〔別実施例〕エンジン出力軸Ｅｓを、冷却
ファンＦａ装着側の主軸１に連動連結させたものでも良
い。又、図３に示すように、デフ機構２１に代えて左右
一対のサイドクラッチＳｃ，Ｓｃを備えた操向クラッチ
機構２１を設けた変速装置でも良い。これによれば、キ
ャスタ式の前輪を備えた車輪式作業車や、クローラ走行
装置式の作業車の伝動装置として好適なものになる。[Other Embodiment] The engine output shaft Es may be linked to the main shaft 1 on the side where the cooling fan Fa is mounted. Further, as shown in FIG. 3, a transmission may be provided in which a steering clutch mechanism 21 including a pair of left and right side clutches Sc, Sc is provided instead of the differential mechanism 21. According to this, it becomes suitable as a transmission device of a wheel type work vehicle provided with caster type front wheels and a crawler traveling type work vehicle.

【００１０】尚、特許請求の範囲の項に図面との対照を
便利にするために符号を記すが、該記入により本発明は
添付図面の構成に限定されるものではない。It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

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

【図１】変速装置の構造を示す展開図FIG. 1 is a development view showing the structure of a transmission.

【図２】図１に続く伝動装置部の展開図FIG. 2 is a development view of the transmission device section following FIG.

【図３】変速装置の別構造を示す要部の展開図FIG. 3 is an exploded view of a main part showing another structure of the transmission.

【符号の説明】[Explanation of symbols]

１ 主軸 ２ 回転体 ３ 変速部材 ４ 変速部 ５ 出力回転体 １２ 伝動軸 １３ 変速回転体 １４ 正逆転切換機構 １５ 伝動ケース ２４ 変速ケース Ａ 摩擦式無段変速装置部 Ｂ 伝動装置部 Ｆａ 冷却ファン DESCRIPTION OF SYMBOLS 1 main shaft 2 rotary body 3 speed change member 4 speed change section 5 output rotary body 12 transmission shaft 13 speed change rotary body 14 forward / reverse switching mechanism 15 transmission case 24 speed change case A friction type continuously variable transmission unit B transmission unit Fa cooling fan

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 動力が入力される主軸（１）の周囲に、
該主軸（１）の軸心を中心として公転駆動される複数の
回転体（２）を配置し、これら回転体（２）に亘って軸
心方向にシフト可能な変速部材（３）を接触して摩擦式
無段変速部（４）を設けるとともに、この変速部（４）
の出力を取出す出力回転体（５）を、前記主軸（１）に
相対回転自在に外嵌する筒軸に構成してある摩擦式無段
変速装置部（Ａ）と、前記主軸（１）に連動連結可能な
伝動軸（１２）に、前記出力回転体（５）に連動連結可
能な変速回転体（１３）を相対回転自在に外嵌し、該変
速回転体（１３）の回転を正及び逆転自在に取出す正逆
転切換機構（１４）を伝動ケース（１５）内に備え、か
つ、前記伝動軸（１２）を前記伝動ケース（１５）外に
延出してある伝動装置部（Ｂ）とを着脱可能に連結し、
前記主軸（１）を前記摩擦式無段変速装置部（Ａ）を覆
う変速ケース（２４）外に延出するとともに、その延出
された部分の前記主軸（１）に前記変速ケース（２４）
を冷却する冷却ファン（Ｆａ）を取付けてある変速装
置。1. Around a main shaft (1) to which power is input,
A plurality of rotating bodies (2) that are driven to revolve around the axis of the main shaft (1) are arranged, and a shift member (3) that is shiftable in the axial direction is brought into contact with the rotating bodies (2). And a friction type continuously variable transmission unit (4)
A friction type continuously variable transmission unit (A) in which an output rotary body (5) for taking out the output of the main shaft (1) is configured as a cylindrical shaft fitted to the main shaft (1) so as to be relatively rotatable relative to the main shaft (1). A transmission rotating body (13) that can be coupled to the output rotating body (5) is externally fitted to the transmission shaft (12) that can be coupled in an interlocking manner so as to rotate relative to the output rotating body (5). A forward-reverse rotation switching mechanism (14) for reversibly taking out the transmission case (15), and a transmission unit (B) extending the transmission shaft (12) to the outside of the transmission case (15). Removably connected,
The main shaft (1) is extended to the outside of the transmission case (24) that covers the friction type continuously variable transmission unit (A), and the transmission case (24) is attached to the extended portion of the main spindle (1).
A transmission equipped with a cooling fan (Fa) for cooling the vehicle.