JP3022427B2 - Power transmission device - Google Patents
Power transmission deviceInfo
- Publication number
- JP3022427B2 JP3022427B2 JP9224702A JP22470297A JP3022427B2 JP 3022427 B2 JP3022427 B2 JP 3022427B2 JP 9224702 A JP9224702 A JP 9224702A JP 22470297 A JP22470297 A JP 22470297A JP 3022427 B2 JP3022427 B2 JP 3022427B2
- Authority
- JP
- Japan
- Prior art keywords
- driven
- rotating body
- gear
- shaft
- driving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Arrangement And Driving Of Transmission Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、動力伝達装置に関
し、例えば、農用トラクタ−等の前輪駆動装置に利用で
きる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device, and can be used, for example, for a front wheel drive device of an agricultural tractor or the like.
【０００２】[0002]
【従来技術】圃場内で農用トラクタ−を旋回させると
き、作業能率を向上させ、しかも圃場を荒らさないで小
半径で機体を旋回させることが望ましい。また、地盤が
軟弱な圃場内で大きな推力を得るためには二輪駆動より
も四輪駆動で機体を走行させる方が良い。このため、従
来は四輪駆動型の農用トラクタ−において、前輪駆動系
に前輪増速装置を設け、直進時には前輪増速装置を低速
側に切換え、旋回時には高速側に切換えて前輪の周速を
上げ、旋回時間と旋回半径を小さくするように構成した
所謂倍速機構付のトラクタ−が出現している。2. Description of the Related Art When turning an agricultural tractor in a field, it is desirable to improve the working efficiency and to turn the body with a small radius without damaging the field. In addition, in order to obtain a large thrust in a field where the ground is soft, it is better to drive the aircraft with four-wheel drive than with two-wheel drive. For this reason, conventionally, in a four-wheel drive type agricultural tractor, a front wheel speed increasing device is provided in a front wheel drive system, and the front wheel speed increasing device is switched to a low speed side when going straight, and is switched to a high speed side when turning, so that the peripheral speed of the front wheel is increased. A tractor with a so-called double speed mechanism that is configured to reduce the turning time and turning radius has appeared.
【０００３】[0003]
【発明が解決しようとする課題】ところで、前記した従
来装置にあっては、旋回時に前輪の回転速度が増速され
て機体の旋回半径が小さくなるものの、前輪増速装置が
切換わるときにショックが発生する不具合や増速された
前輪が後輪を引きずるようにして走行するため、前輪が
地面を引っ掻いて荒らすという問題点を有していた。In the conventional apparatus described above, the turning speed of the front wheels is increased at the time of turning to reduce the turning radius of the body, but a shock occurs when the front wheel speed increasing device is switched. There is a problem that the front wheels scratch the ground and become rough because the front wheels accelerated and drag the rear wheels to travel.
【０００４】[0004]
【課題を解決するための手段】この発明は前記した不具
合に鑑みて提案するものであって、以下のような技術的
手段を講じた。即ち、駆動側の回転体６５と従動側の回
転体７５とが同一軸心上にあり、且つ駆動側の回転体６
５の軸心延長線上に従動側の回転体７５が設けられた動
力伝達装置において、前記駆動側回転体６５の従動回転
体７５側に対向する部位に凹凸状のカム部６５ａを設
け、駆動側回転体６５と従動側回転体７５との間には凹
凸状のカム部７２ａを有する従動リング体７２を軸体に
遊転状に設けて両カム部６５ａ、７２ａの噛み合いによ
り駆動側回転体６５側から従動リング体７２側に回転動
力を伝えるようになし、更に前記従動リング体７２と従
動側回転体７５には係脱可能で動力伝達可能な係止爪７
２ｂ、７５ｂを設け、駆動側回転体６５のカム部６５ａ
が正転時あるいは逆転時に従動リング体７２のカム部７
２ａを押圧するとき前記係止爪７２ｂ、７５ｂが噛み合
って従動回転体７５が強制駆動され、従動側回転体７５
の先行回転により従動側回転体７５の回転速度が駆動側
回転体６５の回転速度を越えると付勢手段７８により従
動リング体７２を駆動側回転体６５側に移動させて係止
爪７２ｂ、７５ｂ同士の噛み合いを外し、従動側回転体
７５への回転駆動力を断つように構成したことを特徴と
する動力伝達装置の構成とする。SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems, and has the following technical features.
He took the hand stage. That is, the driving side rotating body 65 and the driven side rotating body 75 are on the same axis, and the driving side rotating body 6
In a power transmission device provided with a driven-side rotating body 75 on an extension line of the axis 5 of FIG. 5, an uneven cam portion 65a is provided at a portion of the driving-side rotating body 65 facing the driven rotating body 75, A driven ring body 72 having an uneven cam portion 72a between the rotating body 65 and the driven side rotating body 75 is used as a shaft.
It is provided in an idle state so that the rotational power is transmitted from the drive side rotating body 65 side to the driven ring body 72 side by engagement of the two cam portions 65a, 72a, and the driven ring body 72 and the driven side rotating body 75 Locking pawl 7 that can be disengaged and transmit power
2b and 75b are provided, and the cam portion 65a of the driving-side rotating body 65 is provided.
Is the cam portion 7 of the driven ring body 72 during forward rotation or reverse rotation.
2a, the engaging pawls 72b and 75b are engaged with each other, and the driven rotator 75 is forcibly driven.
When the rotation speed of the driven-side rotator 75 exceeds the rotation speed of the drive-side rotator 65 due to the preceding rotation of the driven ring member 72, the driven ring member 72 is moved to the drive-side rotator 65 by the urging means 78 so that the locking claws 72b, 75b The power transmission device is characterized in that the meshing between them is released and the rotational driving force to the driven-side rotating body 75 is cut off.
【０００５】[0005]
【実施例】以下、図面に示す実施例に基づいて、この発
明の実施例を説明する。まず、構成から説明すると、１
はトラクタ−で走行装置として機体の前後部に夫々前輪
２、２と後輪３、３を有し、機体前部にはエンジン４を
搭載し、その後部にクラッチハウジング５を連結してい
る。クラッチハウジング５内のクラッチ６はクラッチペ
ダル７を踏み込むことにより切り離され、後述する変速
装置側への動力伝達を阻止する。Embodiments of the present invention will be described below with reference to the embodiments shown in the drawings. First, the structure will be described.
Has a front wheel 2, 2 and a rear wheel 3, 3 at the front and rear of the body, respectively, as a traveling device, and has an engine 4 mounted at the front of the body and a clutch housing 5 connected to the rear. The clutch 6 in the clutch housing 5 is disengaged by depressing the clutch pedal 7, and prevents transmission of power to the transmission described below.
【０００６】クラッチハウジング５の後面部には前後進
切換機構１０が収容されており、図示外の前後進切換レ
バ−を前側に倒すと機体は前進し、逆に後側に倒すと後
進する。即ち、変速軸１２上にはシンクロメッシュタイ
プの前後進切換変速機１３が設けられ、シフトフォ−ク
を操作してスリ−ブ１４を前側に移動させると、正転側
のギヤ１６が変速軸１２と直結され、クラッチ軸８端部
に形成したギヤ１７、変速軸１２上のギヤ１６を介して
変速軸１２に正転方向の動力が伝達される。A forward / reverse switching mechanism 10 is accommodated in the rear surface of the clutch housing 5. When the forward / backward switching lever (not shown) is tilted forward, the fuselage moves forward. That is, a synchromesh type forward / reverse switching transmission 13 is provided on the transmission shaft 12, and when the shift fork is operated to move the sleeve 14 to the front side, the gear 16 on the forward rotation rotates the transmission shaft 12 The power in the forward direction is transmitted to the transmission shaft 12 via the gear 17 formed at the end of the clutch shaft 8 and the gear 16 on the transmission shaft 12.
【０００７】前記スリ−ブ１４を後側に移動操作する
と、ギヤ１６の回転は、変速軸１２下部に軸架されたカ
ウンタ−シャフト１８の大径ギヤ２０、カウンタ−シャ
フト１８後部の小径ギヤ２１、バックカウンタ−ギヤ
（図示省略）を順次介して変速軸１２上のギヤ２２に伝
達され、このギヤ２２は変速軸１２に直結されて逆転方
向の動力が伝達される。When the sleeve 14 is moved rearward, the gear 16 is rotated by a large-diameter gear 20 of a counter shaft 18 suspended below the transmission shaft 12 and a small-diameter gear 21 at the rear of the counter shaft 18. Is transmitted to a gear 22 on the transmission shaft 12 via a back counter-gear (not shown) sequentially, and the gear 22 is directly connected to the transmission shaft 12 to transmit power in the reverse direction.
【０００８】そして、変速軸１２は筒状のカップラ−２
４を介してフロントミッションケ−ス２５から突設され
た入力軸２６と連動連結される。入力軸２６の後方に
は、ドライブピニオン２８が同芯状に軸架され、このド
ライブピニオン２８の前部には大径ギヤ２９ａ、中径ギ
ヤ２９ｂ、小径ギヤ２９ｃ、爪部２９ｄからなる主変速
カウンタ−ギヤ２９が回転自在に遊嵌されている。The transmission shaft 12 is a cylindrical coupler-2.
4 and is interlockingly connected to an input shaft 26 protruding from a front transmission case 25 via the front transmission case 4. A drive pinion 28 is coaxially mounted behind the input shaft 26, and a main transmission including a large-diameter gear 29 a, a medium-diameter gear 29 b, a small-diameter gear 29 c, and a pawl 29 d is provided at the front of the drive pinion 28. A counter gear 29 is freely rotatably fitted.
【０００９】３３はその後方にあってドライブピニオン
２８とスプライン嵌合された円筒状のボスであり、この
ボス３３上には摺動ギヤ３５が前後移動可能にスプライ
ン嵌合されている。３６はドライブピニオン２８に遊嵌
された副変速用のギヤであって、最前部に爪部３６ａを
有する。この副変速用のギヤ３６の後部には前輪動力取
出用のギヤ３８がドライブピニオン２８にスプライン嵌
合されている。Reference numeral 33 denotes a cylindrical boss behind and spline-fitted to the drive pinion 28. A sliding gear 35 is spline-fitted on the boss 33 so as to be movable in the forward and backward directions. Reference numeral 36 denotes a sub-transmission gear loosely fitted to the drive pinion 28, and has a claw portion 36a at the forefront. A gear 38 for taking out front wheel power is spline-fitted to the drive pinion 28 at the rear of the gear 36 for the auxiliary transmission.
【００１０】一方、このドライブピニオン２８の下方に
あって前後方向に沿わせて配設されたＰＴＯカウンタ−
シャフト４０は２つの筒状カップリング４１、４２等を
介して前記カウンタ−シャフト１８と連動連結される。
リヤ−ミッションケ−ス４４内に位置するＰＴＯカウン
タ−シャフト４０の前部には、ボス４５を回転自在に遊
嵌し、このボス４５の前部にはギヤ４７をスプライン嵌
合している。On the other hand, a PTO counter disposed below the drive pinion 28 and disposed along the front-rear direction.
The shaft 40 is operatively connected to the counter-shaft 18 via two cylindrical couplings 41, 42 and the like.
A boss 45 is freely rotatably fitted to a front portion of the PTO counter shaft 40 located in the rear transmission case 44, and a gear 47 is spline-fitted to the front portion of the boss 45.
【００１１】そして、このギヤ４７は前記入力軸２６の
後端に形成したギヤ４９と常時噛み合っている。また、
前記ボス４５上の前後には、２枚のギヤ５０、５１が回
転自在に遊嵌され、各ギヤ５０、５１の後部には夫々爪
部５０ａ、５１ａが形成されると共に、前側のギヤ５０
は主変速カウンタ−ギヤ２９の大径ギヤ２９ａに常時噛
み合い、後側のギヤ５１は中径ギヤ２９ｂに常時噛み合
うように構成している。The gear 47 always meshes with a gear 49 formed at the rear end of the input shaft 26. Also,
Two gears 50 and 51 are rotatably and loosely fitted on the front and rear of the boss 45, and claw portions 50a and 51a are formed at the rear of the gears 50 and 51, respectively.
Is designed to always mesh with the large-diameter gear 29a of the main transmission counter-gear 29, and the rear gear 51 is always meshed with the medium-diameter gear 29b.
【００１２】前記ボス４５の後部におけるＰＴＯカウン
タ−シャフト４０上には、大小２枚のギヤ５２、５３を
備えるカウンタ−ギヤ５４を遊嵌し、大径ギヤ５２を主
変速カウンタ−ギヤ２９の小径ギヤ２９ｃに噛み合わ
せ、後側の小径ギヤ５３を副変速用のギヤ３６に常時噛
み合わせている。そして、前記のボス４５上のシフタ−
５６を図３の状態から前側に移動させてボス４５とギヤ
５０とを連結すると、主変速の「１速」が得られ、シフ
タ−５７を同図の状態から前側に移動させると、ボス４
５とギヤ５１が連結されて主変速の「２速」が得られ、
シフタ−５７を逆に後方へ移動させてボス４５と大径ギ
ヤ５２とを連結すると、「第３速」が得られるように構
成している。なお、このとき、摺動ギヤ３５を前側に移
動させて主変速カウンタ−ギヤ２９の爪部２９ｄとボス
３３とを連結しておくと、副変速装置は「高速」とな
り、この摺動ギヤ３５を後側に移動させてボス３３と副
変速用のギヤ３６の爪部３６ａとを連結しておくと、副
変速の「低速」が得られる。A counter gear 54 having two large and small gears 52 and 53 is loosely fitted on the PTO counter shaft 40 at the rear portion of the boss 45, and the large diameter gear 52 is used as the small diameter of the main transmission counter gear 29. The rear small-diameter gear 53 is always meshed with the sub-transmission gear 36. The shifter on the boss 45
When the gear 56 is moved forward from the state shown in FIG. 3 to connect the boss 45 and the gear 50, "1st speed" of the main transmission is obtained. When the shifter 57 is moved forward from the state shown in FIG.
5 and the gear 51 are connected to obtain the second speed of the main speed change,
By connecting the boss 45 and the large-diameter gear 52 by moving the shifter 57 backward, the third speed is obtained. At this time, if the sliding gear 35 is moved to the front side to connect the claw portion 29d of the main transmission counter-gear 29 and the boss 33, the auxiliary transmission becomes "high speed". Is moved to the rear side to connect the boss 33 and the claw portion 36a of the sub-transmission gear 36, thereby obtaining the "low speed" of the sub-transmission.
【００１３】この実施例では、主変速装置と副変速装置
との組合せにより、前後進共、６段の変速が可能であ
り、ここで減速された回転動力が後輪３、３の差動装置
（図示省略）に伝達され、後輪３、３を回転駆動する。
次に前輪駆動系について説明する。ＰＴＯカウンタ−シ
ャフト４０上に遊嵌されたカウンタ−ギヤ５４の後端部
にはギヤ６０が回転自在に遊嵌され、このギヤ６０は前
輪動力取出用ギヤ３８と噛み合うように構成されると共
に、リヤ−ミッションケ−ス４４下部に軸架された前輪
駆動ギヤ６２にも噛み合うように構成されている。６
３、６４は前輪駆動ギヤ６２を支えるベアリングであ
る。駆動体である前輪駆動ギヤ６２の前部には、これと
一体的に駆動リング体６５を設け、その前側には複数個
の凹凸部からなる山型状のカム部６５ａを設けている。In this embodiment, the combination of the main transmission and the auxiliary transmission enables a six-speed shift in forward and backward traveling, and the rotational power reduced here is transmitted to the differential gear of the rear wheels 3, 3. (Not shown) to rotate the rear wheels 3, 3.
Next, the front wheel drive system will be described. A gear 60 is freely rotatably fitted to the rear end of the counter gear 54 loosely fitted on the PTO counter-shaft 40, and the gear 60 is configured to mesh with the front wheel power takeout gear 38, It is also configured to mesh with a front wheel drive gear 62 which is mounted on a lower portion of the rear transmission case 44. 6
3 and 64 are bearings for supporting the front wheel drive gear 62. A drive ring body 65 is provided integrally with a front portion of the front wheel drive gear 62 which is a drive body, and a mountain-shaped cam portion 65a including a plurality of uneven portions is provided on the front side thereof.
【００１４】６７は前記前輪駆動ギヤ６２と同芯上にあ
ってその前方に配設された従動側の第１軸であり、この
第１軸６７の後側軸端は前輪駆動ギヤ６２に形成された
軸孔６８に遊嵌されている。７０は前輪駆動ギヤ６２と
第１駆動軸６７との重合部分を覆うように設けられた筒
状の回転体であって、前記駆動リング体６５により回転
駆動される。Reference numeral 67 denotes a driven-side first shaft which is coaxial with the front wheel driving gear 62 and disposed in front of the front wheel driving gear 62. The rear shaft end of the first shaft 67 is formed on the front wheel driving gear 62. The shaft hole 68 is loosely fitted. Reference numeral 70 denotes a cylindrical rotating body provided so as to cover a portion where the front wheel drive gear 62 and the first drive shaft 67 overlap, and is driven to rotate by the drive ring body 65.
【００１５】７２はこの回転体７０の中にあって、駆動
リング体６５によって回転される従動リング体であり、
後面外周部位には複数個の凹凸部からなる山型状のカム
面からなるカム部７２ａを設けている。このカム部７２
ａと前記駆動リング体６５のカム部６５ａとは、軸心方
向と回転方向には僅かに移動できる間隙を持って両者噛
み合いながら動力を伝達する。Reference numeral 72 denotes a driven ring member that is rotated by the driving ring member 65 in the rotating member 70,
A cam portion 72a made of a mountain-shaped cam surface made up of a plurality of uneven portions is provided on the outer peripheral portion of the rear surface. This cam 72
a and the cam portion 65a of the drive ring body 65 transmit power while meshing with each other with a gap capable of slightly moving in the axial direction and the rotational direction.
【００１６】そして、この従動リング体７２の前側外周
にはクラッチ爪７２ｂを設けている。７５は第１軸６７
の軸端部にスプライン嵌合された従動片であり、その後
面外周にはクラッチ爪７５ｂが形成されている。従動リ
ング体７２のクラッチ爪７２ｂと従動片７５のクラッチ
爪７５ｂが噛み合っているときには、前輪駆動ギヤ６２
側の回転動力が従動片７５を介して第１軸６７に伝達さ
れるが、この噛み合いが外れたときには、第１軸６７は
自由回転状態となって、駆動側である前輪駆動ギヤ６２
の動力は伝達されない。７８は回転体７０の中にあって
その内壁と従動リング体７２との間に配設された付勢手
段としてのスプリングであり、従動リング体７２を常時
後方に向けて付勢している。Further, a clutch pawl 72b is provided on the outer periphery of the front side of the driven ring body 72 on the front side. 75 is the first shaft 67
Is a driven piece that is spline-fitted to the shaft end, and a clutch claw 75b is formed on the outer periphery of the rear surface. When the clutch pawl 72b of the driven ring body 72 and the clutch pawl 75b of the driven piece 75 are engaged, the front wheel drive gear 62
Is transmitted to the first shaft 67 via the driven piece 75, but when this engagement is disengaged, the first shaft 67 is in a free rotation state, and the front wheel drive gear 62 on the drive side is driven.
Power is not transmitted. A spring 78 is provided in the rotating body 70 and provided between the inner wall thereof and the driven ring body 72, and constantly biases the driven ring body 72 rearward.
【００１７】８０は回転体７０の小径部に外嵌された受
部で、その一端はリヤ−ミッションケ−ス４４の壁４４
ａに回り止めのために係止されている。８２は回転体７
０の壁を前後方向に貫通してその後端部が従動リング体
７２と一体的に固着された制動片で、この制動片８２が
貫通している回転体７０の壁内には、この制動片８２が
円周方向において僅かに移動できる隙間７０ａが設けて
あり、また、その制動片８２の前端外周部はブレ−キシ
ュ−８５ａを介してリング状のスプリング８５が巻きつ
けられている。Reference numeral 80 denotes a receiving portion which is fitted to the small diameter portion of the rotating body 70, and one end of which is provided on the wall 44 of the rear transmission case 44.
a for locking. 82 is the rotating body 7
0 is a braking piece that penetrates in the front-rear direction and has a rear end portion integrally fixed to the driven ring body 72. A gap 70a is provided in which 82 can move slightly in the circumferential direction. A ring-shaped spring 85 is wound around the outer periphery of the front end of the braking piece 82 via a brake 85a.
【００１８】そして、前輪駆動ギヤ６２が正転側（機体
前進方向）に回転しているときであって、駆動側の前輪
駆動ギヤ６２と従動側である第１軸６７との間に回転差
が生じていないときには、前輪駆動ギヤ６２の回転動力
は、駆動リング体６５のカム部６５ａ、従動リング体７
２のカム部７２ａ、従動リング体７２のクラッチ爪７２
ｂ、従動片７５のクラッチ爪７５ｂを順次経て、第１軸
６７に伝達されるが、機体旋回時や下り坂時等に、第１
軸６７側の回転が前輪駆動ギヤ６２側の回転速度よりも
速くなったときには、駆動リング体６５のカム部６５ａ
と従動リング体７２のカム部７２ａとの間に回転方向に
おいて隙間が生じ、このため、従動リング体７２はスプ
リング７８によって後方へ押され、従動リング体７２の
クラッチ爪７２ｂと従動片７５のクラッチ爪７５ｂとの
係合が外れて動力の伝達が一時停止される。When the front wheel drive gear 62 is rotating in the normal rotation direction (body forward direction), the rotational difference between the drive side front wheel drive gear 62 and the driven first shaft 67 is reduced. Does not occur, the rotational power of the front wheel drive gear 62 is supplied to the cam portion 65a of the drive ring body 65 and the driven ring body 7
2 cam portion 72a, clutch pawl 72 of driven ring body 72
b, the torque is transmitted to the first shaft 67 via the clutch pawl 75b of the driven piece 75 in sequence.
When the rotation on the shaft 67 side becomes faster than the rotation speed on the front wheel drive gear 62 side, the cam portion 65a of the drive ring body 65
In the rotational direction, a gap is formed between the driven ring body 72 and the cam portion 72a of the driven ring body 72, so that the driven ring body 72 is pushed backward by the spring 78, and the clutch pawl 72b of the driven ring body 72 and the clutch of the driven piece 75 The engagement with the pawl 75b is released, and the transmission of power is temporarily stopped.
【００１９】即ち、前輪駆動ギヤ６２側から従動側であ
る第１軸６７側に動力が伝達されることはない。機体が
後退する場合も同様であり、第１軸６７の回転が、前輪
駆動ギヤ６２側よりも速くなると、第１軸６７側には動
力が伝達されず、したがって、一時的に後輪駆動の状態
となる。That is, power is not transmitted from the front wheel drive gear 62 to the first shaft 67, which is the driven side. The same applies to the case where the body retreats. When the rotation of the first shaft 67 becomes faster than the front wheel drive gear 62 side, power is not transmitted to the first shaft 67 side, and therefore, the rear wheel drive is temporarily stopped. State.
【００２０】なお、この実施例では、駆動リング体６
５、回転体７０、従動リング体７２、従動体７５等をま
とめてクラッチ機構９０と総称する。次にフロントミッ
ションケ−ス２５に収容されている前輪増速機構９５に
ついて説明する。９６は入力ギヤで、ベアリング９７、
９８にて壁１００に軸支されている。In this embodiment, the driving ring 6
5, the rotating body 70, the driven ring body 72, the driven body 75, and the like are collectively referred to as a clutch mechanism 90. Next, the front wheel speed increasing mechanism 95 housed in the front transmission case 25 will be described. 96 is an input gear, bearing 97,
At 98, it is pivotally supported on the wall 100.
【００２１】１０１は第１軸６７の前部に設けられた第
２軸であり、その後端はベアリング１０２を介して入力
ギヤ９６に軸支され、前端はベアリング１０３によりフ
ロントミッションケ−ス２５の前壁に軸支されている。
１０５は第２駆動軸１０１に固着された筒状の回転ドラ
ムであり、中央部の壁を挾んで前後に摩擦クラッチ部１
０６、１０７が設けられている。Reference numeral 101 denotes a second shaft provided at the front of the first shaft 67. The rear end of the second shaft 101 is supported by an input gear 96 via a bearing 102, and the front end of the front transmission case 25 is supported by a bearing 103. It is supported by the front wall.
Numeral 105 denotes a cylindrical rotary drum fixed to the second drive shaft 101.
06 and 107 are provided.
【００２２】１０８は後側の摩擦クラッチ部１０７を押
圧するための皿バネ、１０９は前側の摩擦クラッチ部１
０６を押圧するピストンである。１１０は第２軸１０１
に平行に軸架されたカウンタ−シャフトであり、このカ
ウンタ−シャフト１１０の前後にはギヤ１１１、１１２
が固着されている。後側のギヤ１１１は入力ギヤ９６と
噛み合い、前側のギヤ１１２は第２軸１０１に遊嵌され
たギヤ１１３に噛み合う。Reference numeral 108 denotes a disc spring for pressing the rear friction clutch unit 107, and reference numeral 109 denotes a front friction clutch unit 1.
06. 110 is the second axis 101
The counter-shaft 110 is provided with gears 111 and 112 before and after the counter-shaft 110.
Is fixed. The rear gear 111 meshes with the input gear 96, and the front gear 112 meshes with the gear 113 loosely fitted on the second shaft 101.
【００２３】機体が直進しているときには、後側の摩擦
クラッチ部１０７が常時押圧され、このため、第１軸６
７の回転動力は、入力ギヤ９６、摩擦クラッチ部１０
７、回転ドラム１０５を介して第２軸１０１に伝達され
る。この場合の前輪２、２の周速と後輪３、３の周速は
略同一となるように各伝動ギヤのギヤ比を設定する。機
体を旋回させるべくステアリングハンドル１１８を回動
して前輪２、２を所定角度以上操作すると、ピストン１
０９が前方に押し出されて前側の摩擦クラッチ部１０６
が接続され、後側の摩擦クラッチ部１０７はフリ−とな
る。When the body is moving straight, the rear friction clutch portion 107 is constantly pressed, so that the first shaft 6
7 is driven by the input gear 96 and the friction clutch unit 10.
7, transmitted to the second shaft 101 via the rotating drum 105. In this case, the gear ratio of each transmission gear is set so that the peripheral speed of the front wheels 2 and 2 and the peripheral speed of the rear wheels 3 and 3 are substantially the same. When the steering wheel 118 is turned to operate the front wheels 2 and 2 by a predetermined angle or more to turn the body, the piston 1
09 is pushed forward and the friction clutch unit 106 on the front side
Is connected, and the rear friction clutch unit 107 is free.
【００２４】この場合の前輪増速機構９５による増速の
割合は、前輪２、２の周速が後輪３、３の周速よりも
大、具体的には、周速比で１．４倍程度に増速されるよ
うなギヤ比を設定することが望ましい。なお、図中符号
１２０は第２軸１０１に接続されて前輪差動装置（図示
省略）を駆動する第３駆動軸、１２２はシャフトカバ−
である。In this case, the ratio of the speed increase by the front wheel speed-up mechanism 95 is such that the peripheral speed of the front wheels 2 and 2 is higher than the peripheral speed of the rear wheels 3 and 3, specifically, the peripheral speed ratio is 1.4. It is desirable to set a gear ratio such that the speed is increased about twice. In the figure, reference numeral 120 denotes a third drive shaft connected to the second shaft 101 for driving a front wheel differential (not shown), and 122 denotes a shaft cover.
It is.
【００２５】上例において、圃場内でトラクタ−１を走
行させるとき、直進走行状態であれば、前輪増速機構９
０は標準四駆状態、即ち、前後輪２、３の周速比が略一
定の状態となって機体は走行する。そして、畦際で機体
を旋回させるべくステアリングハンドル１１８を回して
所定角度以上前輪２、２を舵取操作すると、標準四駆の
状態から増速状態に切り換えられ、前輪２、２の周速が
後輪３、３の周速よりも１．４倍程度に増速される。In the above example, when the tractor-1 travels in the field, if the vehicle is traveling straight, the front wheel speed increasing mechanism 9
0 indicates a standard four-wheel drive state, that is, a state in which the peripheral speed ratio between the front and rear wheels 2 and 3 is substantially constant, and the aircraft travels. When the front wheels 2, 2 are steered by turning the steering handle 118 at a predetermined angle or more to turn the fuselage on the ridge, the state is switched from the standard 4WD state to the speed increasing state, and the peripheral speed of the front wheels 2, 2 is reduced. The speed is increased to about 1.4 times the peripheral speed of the rear wheels 3,3.
【００２６】前後輪２、３の周速が略同速の状態から略
１．４倍に変わる際に、従来装置の場合では、所定の前
輪操舵角度を境にして前輪２、２の周速が一気に変化
し、このため、前後輪共に駆動する形態のトラクタ−で
は後輪３、３に対する前輪２、２の周速が約１．０倍
か、あるいは１．４倍の状態しか作り出し得なかった
が、この実施例に示す装置では、前輪増速機構９５の手
前にクラッチ機構９０が設けられているので、前輪２、
２の周速が１．０倍から１．４倍に移る間であって前輪
２、２が地面からの反力を受けて増速されようとしたと
きには、前輪２、２の駆動が解かれて後輪３、３のみが
駆動される状態が生じ、この結果、前輪２、２の周速が
略１．０倍〜１．４倍以下の範囲で徐々に上昇させられ
る区間が作り出され、前輪２、２の増速切換をショック
なくスム−ズに行なうことができるのである。When the peripheral speeds of the front and rear wheels 2 and 3 are changed from approximately the same speed to approximately 1.4 times, in the case of the conventional device, the peripheral speeds of the front wheels 2 and 2 are set at a predetermined front wheel steering angle. At a stretch, so that in a tractor in which both the front and rear wheels are driven, the peripheral speed of the front wheels 2, 2 with respect to the rear wheels 3, 3 can only be about 1.0 times or 1.4 times. However, in the device shown in this embodiment, since the clutch mechanism 90 is provided in front of the front wheel speed-up mechanism 95, the front wheels 2,
When the peripheral speed of the front wheels 2, 2 changes from 1.0 times to 1.4 times and the front wheels 2, 2 try to increase in speed due to the reaction force from the ground, the driving of the front wheels 2, 2 is released. As a result, a state in which only the rear wheels 3, 3 are driven occurs, and as a result, a section is created in which the peripheral speed of the front wheels 2, 2 is gradually increased in a range of about 1.0 to 1.4 times or less, The speed increase of the front wheels 2, 2 can be smoothly performed without shock.
【００２７】また、このとき、前輪２、２の周速は徐々
に上昇して滑らかに動力が伝えられるので前輪２、２が
地面を掻いて圃場を荒らすこともなく、このため旋回も
容易となる。さらに、片ブレ−キを踏んで心地旋回をし
たときには、地面からの接地抵抗を受けて前輪２、２
は、その周速が１．４倍以上の速さで回転しようとする
が、このような場合には、前輪増速機構９５の手前に設
けたクラッチ機構９０が作動して前輪２、２側には回転
動力が伝えられず、後輪３、３のみの駆動で機体を旋回
させることになるので、所謂前輪２、２の土押し作用が
なくなり、前輪２、２は単に転動するだけで圃場を荒ら
すことがない。At this time, the peripheral speed of the front wheels 2 and 2 gradually increases, and power is transmitted smoothly, so that the front wheels 2 and 2 do not scratch the ground and roughen the field, so that turning is easy. Become. Further, when the driver makes a comfortable turn by stepping on one brake, the front wheels 2 and 2 receive the ground resistance from the ground.
Tends to rotate at a peripheral speed of 1.4 times or more. In such a case, the clutch mechanism 90 provided in front of the front wheel speed-up mechanism 95 operates to operate the front wheels 2 and 2 Is not transmitted to the vehicle and the body is turned only by driving the rear wheels 3 and 3, so that the so-called pushing action of the front wheels 2 and 2 is eliminated, and the front wheels 2 and 2 simply roll. Does not destroy the field.
【００２８】[0028]
【発明の効果】この発明は前記の如く、駆動側の回転体
６５と従動側の回転体７５とが同一軸心上にあり、且つ
駆動側の回転体６５の軸心延長線上に従動側の回転体７
５が設けられた動力伝達装置において、前記駆動側回転
体６５の従動回転体７５側に対向する部位に凹凸状のカ
ム部６５ａを設け、駆動側回転体６５と従動側回転体７
５との間には凹凸状のカム部７２ａを有する従動リング
体７２を軸体に遊転状に設けて両カム部６５ａ、７２ａ
の噛み合いにより駆動側回転体６５側から従動リング体
７２側に回転動力を伝えるようになし、更に前記従動リ
ング体７２と従動側回転体７５には係脱可能で動力伝達
可能な係止爪７２ｂ、７５ｂを設け、駆動側回転体６５
のカム部６５ａが正転時あるいは逆転時に従動リング体
７２のカム部７２ａを押圧するとき前記係止爪７２ｂ、
７５ｂが噛み合って従動回転体７５が強制駆動され、従
動側回転体７５の先行回転により従動側回転体７５の回
転速度が駆動側回転体６５の回転速度を越えると付勢手
段７８により従動リング体７２を駆動側回転体６５側に
移動させて係止爪７２ｂ、７５ｂ同士の噛み合いを外
し、従動側回転体７５への回転駆動力を断つように構成
したので、従動側の回転体７５が駆動側の回転体６５よ
りも速く回されるようなときには従動側回転体７５への
駆動力が断たれて動力伝動系に過大な負荷が掛かること
がない。しかも、この装置は正転時だけでなく、逆転時
にもワンウェイクラッチとして働くので便利である。
又、従動リング体７２を軸体に遊転状に設けるものであ
るから、軸方向の移動が円滑となる上、ミッションケー
ス内にコンパクトに収納できる。As described above, according to the present invention, the rotating body 65 on the driving side and the rotating body 75 on the driven side are on the same axis, and the rotating body 65 on the driven side is extended along the axis of the rotating body 65 on the driving side. Rotating body 7
In the power transmission device provided with the rotator 5, an uneven cam portion 65 a is provided at a portion of the drive-side rotator 65 facing the driven rotator 75 side, and the drive-side rotator 65 and the driven rotator 7 are provided.
5, a driven ring body 72 having an uneven cam portion 72a is provided on the shaft in a free-rotating manner, and the two cam portions 65a, 72a
The rotational force is transmitted from the drive side rotating body 65 side to the driven ring body 72 side by the meshing, and furthermore, the driven claw 72b capable of engaging and disengaging and transmitting the power to the driven ring body 72 and the driven side rotating body 75. , 75b, and the driving-side rotator 65
When the cam portion 65a presses the cam portion 72a of the driven ring body 72 at the time of forward rotation or reverse rotation, the locking claw 72b,
When the driven rotator 75 is forcibly driven by the engagement of the driven ring 75b and the rotation speed of the driven rotator 75 exceeds the rotation speed of the drive rotator 65 due to the preceding rotation of the driven rotator 75, the driven ring member is 72 is moved to the driving side rotating body 65 side to disengage the locking claws 72b and 75b from each other and the rotational driving force to the driven side rotating body 75 is cut off, so that the driven side rotating body 75 is driven. When the rotating body 65 is rotated faster than the rotating body 65 on the side, the driving force to the driven rotating body 75 is cut off, and an excessive load is not applied to the power transmission system. In addition, this device is not only at the time of the normal rotation, Ru convenient der so acts as a one-way clutch even at the time of reversal.
Further, the driven ring body 72 is provided on the shaft body in a free running manner.
Therefore, the movement in the axial direction is smooth, and it can be stored compactly in the transmission case.
【００２９】特に、この装置を農用トラクタ−の前輪駆
動装置に利用すると、前進旋回時も後進旋回時も前輪が
後輪に対してブレ−キとなるようなことがなく、スム−
ズな旋回が可能となる。In particular, when this device is used as a front wheel drive device for an agricultural tractor, the front wheels do not brake with respect to the rear wheels in both forward turning and reverse turning.
Small turning is possible.
【図１】全体側面図である。FIG. 1 is an overall side view.
【図２】ミッションの断面図である。FIG. 2 is a sectional view of a mission.
【図３】ミッションの断面図である。FIG. 3 is a sectional view of a mission.
１ トラクタ− ２ 前輪 ３ 後輪 ４ エンジン １０ 前後進切換装置 ２５ フロントミッションケ−ス ２８ ドライブピニオン ３８ 前輪動力取出装置 ４４ リヤ−ミッションケ−ス ６２ 駆動体（前輪駆動ギヤ） ６５ 駆動リング体 ６５ａ カム部 ６７ 従動体（第１軸） ７２ 従動リング体 ７２ａ カム部 ７２ｂ 係止爪 ７５ 従動回転体 ７５ｂ 係止爪 ７８ 付勢手段（スプリング） ９０ 前輪速度制御機構 ９５ 前輪増速機構 REFERENCE SIGNS LIST 1 tractor 2 front wheel 3 rear wheel 4 engine 10 forward / reverse switching device 25 front transmission case 28 drive pinion 38 front wheel power take-out device 44 rear transmission case 62 drive body (front wheel drive gear) 65 drive ring body 65a cam Part 67 Follower (first shaft) 72 Follower ring 72a Cam portion 72b Locking claw 75 Driven rotor 75b Locking claw 78 Energizing means (spring) 90 Front wheel speed control mechanism 95 Front wheel speed increasing mechanism
Claims (1)
５とが同一軸心上にあり、且つ駆動側の回転体６５の軸
心延長線上に従動側の回転体７５が設けられた動力伝達
装置において、前記駆動側回転体６５の従動回転体７５
側に対向する部位に凹凸状のカム部６５ａを設け、駆動
側回転体６５と従動側回転体７５との間には凹凸状のカ
ム部７２ａを有する従動リング体７２を軸体に遊転状に
設けて両カム部６５ａ、７２ａの噛み合いにより駆動側
回転体６５側から従動リング体７２側に回転動力を伝え
るようになし、更に前記従動リング体７２と従動側回転
体７５には係脱可能で動力伝達可能な係止爪７２ｂ、７
５ｂを設け、駆動側回転体６５のカム部６５ａが正転時
あるいは逆転時に従動リング体７２のカム部７２ａを押
圧するとき前記係止爪７２ｂ、７５ｂが噛み合って従動
回転体７５が強制駆動され、従動側回転体７５の先行回
転により従動側回転体７５の回転速度が駆動側回転体６
５の回転速度を越えると付勢手段７８により従動リング
体７２を駆動側回転体６５側に移動させて係止爪７２
ｂ、７５ｂ同士の噛み合いを外し、従動側回転体７５へ
の回転駆動力を断つように構成したことを特徴とする動
力伝達装置。1. A rotating body 65 on the driving side and a rotating body 7 on the driven side.
5 is on the same axis, and a driven side rotating body 75 is provided on an extension of the axis of the driven side rotating body 65 in the power transmission device.
An uneven cam portion 65a is provided at a portion facing the side, and a driven ring body 72 having an uneven cam portion 72a between the driving side rotating body 65 and the driven side rotating body 75 is idled around a shaft. The cam portions 65a, 72a are engaged to transmit rotational power from the drive side rotating body 65 side to the driven ring body 72 side, and further to the driven ring body 72 and the driven side rotating body 75. Are locking pawls 72b, 7 that can be disengaged and transmit power.
5b is provided, and when the cam portion 65a of the driving-side rotating body 65 presses the cam portion 72a of the driven ring body 72 at the time of forward rotation or reverse rotation, the locking claws 72b and 75b engage with each other, and the driven rotating body 75 is forcibly driven. The rotation speed of the driven-side rotator 75 is increased by the preceding rotation of the driven-side rotator 75.
When the rotation speed exceeds 5, the urging means 78 moves the driven ring body 72 toward the driving-side rotating body 65, and
A power transmission device characterized in that the engagement between the b and 75b is released and the rotational driving force to the driven side rotating body 75 is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9224702A JP3022427B2 (en) | 1997-08-21 | 1997-08-21 | Power transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9224702A JP3022427B2 (en) | 1997-08-21 | 1997-08-21 | Power transmission device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2317058A Division JP2979632B2 (en) | 1990-11-20 | 1990-11-20 | Front wheel drive for powered vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1076857A JPH1076857A (en) | 1998-03-24 |
| JP3022427B2 true JP3022427B2 (en) | 2000-03-21 |
Family
ID=16817913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9224702A Expired - Lifetime JP3022427B2 (en) | 1997-08-21 | 1997-08-21 | Power transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3022427B2 (en) |
-
1997
- 1997-08-21 JP JP9224702A patent/JP3022427B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1076857A (en) | 1998-03-24 |
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