JPH11334401A - Traveling driving device for work vehicle - Google Patents

Traveling driving device for work vehicle

Info

Publication number
JPH11334401A
JPH11334401A JP14951398A JP14951398A JPH11334401A JP H11334401 A JPH11334401 A JP H11334401A JP 14951398 A JP14951398 A JP 14951398A JP 14951398 A JP14951398 A JP 14951398A JP H11334401 A JPH11334401 A JP H11334401A
Authority
JP
Japan
Prior art keywords
case
speed
transmission
front wheel
gear
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.)
Pending
Application number
JP14951398A
Other languages
Japanese (ja)
Inventor
Shigeru Kodama
茂 児玉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kanzaki Kokyukoki Manufacturing Co Ltd
Original Assignee
Kanzaki Kokyukoki Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kanzaki Kokyukoki Manufacturing Co Ltd filed Critical Kanzaki Kokyukoki Manufacturing Co Ltd
Priority to JP14951398A priority Critical patent/JPH11334401A/en
Publication of JPH11334401A publication Critical patent/JPH11334401A/en
Pending legal-status Critical Current

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  • Arrangement And Driving Of Transmission Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To protect a front wheel speed increase switching device by preventing the large protrusion of the front wheel speed increase switching device toward the lower side of a transmission case, increasing its height from the ground and housing the same in a first case in a compact manner. SOLUTION: In the traveling driving device of a work vehicle where a rear wheel transmission system is composed by connecting a first case 5a supporting a hydraulic continuously variable transmission and a second case 5b supporting a gear transmission back with each other back and forth, a transmission shaft rotated in synchronization with the output shaft of the gear transmission and a front wheel driving output shaft are provided in parallel in the first case, a front wheel speed increase switching device 51 capable of switching the speed of driving rotation for a front wheel to be more or equal to that for a rear wheel is provided between both shafts, and the front wheel driving output shaft from the front face of the first case.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、四輪駆動機構にお
いて前輪を後輪と同速状態としたり、前輪を後輪よりも
高速回転させる増速状態とに切り換えるためのクラッチ
機構の配置構成に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement of a clutch mechanism in a four-wheel drive mechanism for switching a front wheel to the same speed as a rear wheel or switching to a speed-up state in which a front wheel rotates faster than a rear wheel. .

【0002】[0002]

【従来の技術】従来から四輪駆動の農用トラクタによっ
て耕耘作業を行う場合、圃場端で回行するときに、前輪
と後輪が略同じ速度で急旋回すると、旋回方向内側の後
輪を中心に旋回するために、前輪の回転が機体の回転に
追随できず回転が遅れて圃場を傷めてしまう。そこで、
近年、作業時において、旋回する場合には前輪の回転数
を上げて機体の旋回に追随させて圃場を傷めないように
なってきた。この前輪増速機構は運転席のハンドルを設
定角度以上回動すると、機械的にハンドルの回転力によ
って増速クラッチをONする構成としたり、或いは、ハ
ンドルまたは前輪までの操向駆動経路途中にセンサーを
設けて、その角度を検知してアクチュエーターを作動し
て、設定角度以上回転すると増速クラッチをONする構
成としていた。
2. Description of the Related Art Conventionally, when tilling work is performed by a four-wheel drive agricultural tractor, when the front wheel and the rear wheel make a sharp turn at substantially the same speed when rotating at the edge of the field, the rear wheel inside the turning direction is centered. Therefore, the rotation of the front wheels cannot follow the rotation of the body, and the rotation is delayed, thereby damaging the field. Therefore,
In recent years, at the time of work, when turning, the number of rotations of the front wheels has been increased to follow the turning of the body, so as not to damage the field. The front wheel speed increasing mechanism is configured to mechanically turn on the speed increasing clutch by the turning force of the steering wheel when the steering wheel of the driver's seat is turned by more than a set angle, or a sensor in the steering drive path to the steering wheel or the front wheel. And the actuator is actuated by detecting the angle to turn on the speed-increasing clutch when it rotates by more than the set angle.

【0003】[0003]

【発明が解決しようとする課題】しかし、前記前輪増速
と同速駆動を切り換える前輪増速切換装置を収納したケ
ースまたはその取出部はユニットとしてミッションケー
スの下部に配置され、下方へ大きく突出する構成となっ
ていたので、地上高が低くなり、そのユニットは障害物
等に当たり易く、損傷する危険性が高くなっていたので
ある。
However, the case housing the front wheel speed-up switching device for switching between the front wheel speed-up and the same speed drive or the take-out portion thereof is arranged as a unit at the lower part of the transmission case and protrudes greatly downward. Due to the configuration, the ground height was low, and the unit was easily hit by obstacles and the like, and the danger of being damaged was increased.

【0004】[0004]

【課題を解決するための手段】本発明は上記課題を解決
する為に次の如く構成したものである。即ち、油圧式無
段変速装置を支持する第一ケースとギア式変速装置を支
持する第二ケースとを前後に連結して後輪伝動系を構成
した作業車両の走行駆動装置において、前記ギア式変速
装置の出力軸と同期回転する伝動軸、並びに、前輪駆動
出力軸を前記第一ケース内に平行させて設け、両軸間
に、前輪への駆動回転を後輪に対して増速又は略同速に
切換可能な前輪増速切換装置を構成すると共に前輪駆動
出力軸を前記第一ケースの前面より突出させたものであ
る。
Means for Solving the Problems The present invention is configured as follows to solve the above-mentioned problems. That is, in a traveling drive device of a working vehicle in which a first case supporting a hydraulic type continuously variable transmission and a second case supporting a gear type transmission are connected back and forth to form a rear wheel transmission system, A transmission shaft that rotates synchronously with the output shaft of the transmission, and a front wheel drive output shaft are provided in parallel in the first case, and between both shafts, drive rotation to the front wheels is increased or substantially increased with respect to the rear wheels. A front wheel speed changeover device capable of switching to the same speed is constituted, and a front wheel drive output shaft is projected from a front surface of the first case.

【0005】[0005]

【発明の実施の形態】次に四輪駆動車両としてトラクタ
に本発明の前輪増速切換装置を適用した実施例の構成を
説明する。図1は本発明の前輪増速切換装置を搭載した
トラクタの全体側面図、図2は動力伝達機構を示すスケ
ルトン図、図3は前輪増速切換装置の側面断面図、図4
は同じく正面断面図、図5は図4におけるX−X矢視断
面図、図6は副変速が高速段に変速された状態の前輪増
速切換装置の正面断面図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the configuration of an embodiment in which the front wheel speed increasing switching device of the present invention is applied to a tractor as a four-wheel drive vehicle will be described. FIG. 1 is an overall side view of a tractor equipped with a front wheel speed increasing switching device of the present invention, FIG. 2 is a skeleton diagram showing a power transmission mechanism, FIG. 3 is a side sectional view of the front wheel speed increasing switching device, and FIG.
5 is a front sectional view of the same, FIG. 5 is a sectional view taken along the line XX in FIG. 4, and FIG. 6 is a front sectional view of the front wheel speed increasing switching device in a state where the subtransmission is shifted to a high gear.

【0006】図1において、本発明の前輪増速切換装置
を有するトラクタの全体構成から説明する。機体前部上
のボンネット1内にエンジン2を収納し、該エンジン2
よりクラッチハウジング3内のダンパーや伝動軸を介し
てミッションケース5より前方に突出した入力軸20に
動力を伝達している。また、ボンネット1後部にはダッ
シュボード6を設けて、該ダッシュボード6上にハンド
ル7を配置している。ミッションケース5上に座席8を
配置し、該座席8側部に主変速レバー9や副変速レバー
やPTO変速レバーや昇降レバー等が配置されている。
前記エンジン2を支持するフロントフレーム10前方下
部にフロントアクスルケース11を介して前輪12が支
持され、前記ミッションケース5両側に突設したリアア
クスルケース13を介して後輪14が支持されている。
前記ミッションケース5の後部には作業機装着装置15
が配置されてる。
Referring to FIG. 1, the entire structure of a tractor having a front wheel speed increasing switching device according to the present invention will be described. An engine 2 is housed in a hood 1 on the front of the fuselage.
Power is transmitted to an input shaft 20 that projects forward from the transmission case 5 via a damper and a transmission shaft in the clutch housing 3. A dashboard 6 is provided at the rear of the hood 1, and a handle 7 is arranged on the dashboard 6. A seat 8 is arranged on the transmission case 5, and a main shift lever 9, an auxiliary shift lever, a PTO shift lever, an elevating lever, and the like are arranged on the side of the seat 8.
A front wheel 12 is supported via a front axle case 11 at a lower front portion of a front frame 10 supporting the engine 2, and a rear wheel 14 is supported via a rear axle case 13 protruding from both sides of the transmission case 5.
A work implement mounting device 15 is provided at the rear of the transmission case 5.
Is placed.

【0007】次に、前記ミッションケース内の構成を図
2より説明する。前記ミッションケース5は前方の第一
ケース5aと、後方の第二ケース5bと、前記第一ケー
ス5aと第二ケース5bの間に位置してケース間を仕切
るセンタープレート5cと、前記第一ケース5aの前面
の開口部を覆う前壁5dより構成されている。該第一ケ
ース5aに油圧式無段変速装置が支持され、第二ケース
5bとセンタープレート5cの間で構成する部屋にギア
式変速装置を収容している。
Next, the structure inside the transmission case will be described with reference to FIG. The transmission case 5 includes a front first case 5a, a rear second case 5b, a center plate 5c positioned between the first case 5a and the second case 5b to partition between the cases, It is composed of a front wall 5d that covers the opening at the front of 5a. A hydraulic type continuously variable transmission is supported by the first case 5a, and a gear type transmission is accommodated in a room formed between the second case 5b and the center plate 5c.

【0008】即ち、前記第二ケース5bとセンタープレ
ート5cと前壁5dの間には機体前後方向に入力軸20
が回転自在に支持され、該前壁5dより前方へ突出した
入力軸20上にはチャージポンプ22が配置され、前記
前壁5dの後面には油圧式無段変速装置を構成する油圧
ポンプ23が配置され入力軸20に連結され、第二ケー
ス5b内の入力軸20上には幅広の駆動歯車25が固設
されている。また、前記第二ケース5bとセンタープレ
ート5cには前記入力軸20と平行にPTO伝動軸2
1、中間軸26、走行出力軸27が回転自在に支持さ
れ、該PTO伝動軸21の前部上と中間軸26の前半部
分にPTO変速装置30が配置されている。
That is, the input shaft 20 is provided between the second case 5b, the center plate 5c and the front wall 5d in the longitudinal direction of the body.
Is rotatably supported, a charge pump 22 is disposed on an input shaft 20 protruding forward from the front wall 5d, and a hydraulic pump 23 constituting a hydraulic stepless transmission is provided on a rear surface of the front wall 5d. A wide drive gear 25 is fixedly mounted on the input shaft 20 in the second case 5b. The second case 5b and the center plate 5c are mounted on the PTO transmission shaft 2 in parallel with the input shaft 20.
1, an intermediate shaft 26 and a traveling output shaft 27 are rotatably supported, and a PTO transmission 30 is disposed on a front portion of the PTO transmission shaft 21 and a front half portion of the intermediate shaft 26.

【0009】該PTO変速装置30は次のように構成さ
れている。即ち、PTO伝動軸21上に三速遊嵌歯車3
1と一速遊嵌歯車32と逆転歯車33を遊嵌し、三速遊
嵌歯車31と一速遊嵌歯車32の間のPTO伝動軸21
上に二速摺動歯車34がスプライン嵌合されて摺動自在
としている。そして、前記逆転歯車33は前記入力軸2
0上の駆動歯車25と常時噛合され、前記中間軸26上
には筒軸35が外嵌され、筒軸35上に、異径の歯車3
5a・35b・35cが形成されている。歯車35a
は、前記入力軸20上の駆動歯車25と常時噛合して動
力を伝え、更に、PTO伝動軸21上の三速遊嵌歯車3
1とも常時噛合している。歯車35cはPTO伝動軸2
1上の一速遊嵌歯車32と常時噛合している。
The PTO transmission 30 is constructed as follows. That is, the three-speed free-fitting gear 3 is mounted on the PTO transmission shaft 21.
1 and the first speed free-fitting gear 32 and the reverse rotation gear 33 are loosely fitted, and the PTO transmission shaft 21 between the third speed free-fitting gear 31 and the first speed free-fitting gear 32 is fitted.
A two-speed sliding gear 34 is spline-fitted on the upper part so as to be slidable. The reverse gear 33 is connected to the input shaft 2.
The intermediate gear 26 is always meshed with the drive gear 25, and a cylindrical shaft 35 is externally fitted on the intermediate shaft 26.
5a, 35b and 35c are formed. Gear 35a
Are always meshed with the drive gear 25 on the input shaft 20 to transmit power, and further, the three-speed free-fit gear 3 on the PTO transmission shaft 21
Both are always engaged. The gear 35c is a PTO transmission shaft 2
1 is always meshed with the first speed free-fit gear 32.

【0010】そして、前記二速摺動歯車34をPTO伝
動軸21上で摺動して、二速摺動歯車34の爪部を一速
遊嵌歯車32の爪部と噛合させることでPTO一速に変
速でき、二速摺動歯車34を歯車35bと噛合させるこ
とによってPTO二速に変速でき、二速摺動歯車34の
爪部を三速遊嵌歯車31の爪部と噛合させることでPT
O三速に変速でき、二速摺動歯車34の爪部を逆転歯車
33の爪部と噛合させることによりPTO伝動軸21を
逆転することができる。 このようにして、入力軸2
0、駆動歯車25よりPTO変速装置30を介してPT
O伝動軸21に動力を伝達し、更に、該PTO伝動軸2
1よりミッションケース5後部に設けた減速歯車を介し
て、ミッションケース5後面より後方に突出したリアP
TO軸24に動力を伝えるのである。
The second-speed sliding gear 34 is slid on the PTO transmission shaft 21 so that the claw portion of the second-speed sliding gear 34 meshes with the claw portion of the first-speed free-fitting gear 32 so that the High speed, and the second speed sliding gear 34 can be shifted to the second speed by engaging the gear 35b with the gear 35b. By engaging the claw portion of the second speed sliding gear 34 with the claw portion of the third speed free-fitting gear 31, PT
The gear can be shifted to the third speed, and the PTO transmission shaft 21 can be reversed by engaging the pawl of the second-speed sliding gear 34 with the pawl of the reversing gear 33. Thus, input shaft 2
0, PT from the drive gear 25 via the PTO transmission 30
Power to the O transmission shaft 21 and further to the PTO transmission shaft 2
1 and rear P projecting rearward from the rear surface of the transmission case 5 via a reduction gear provided at the rear of the transmission case 5.
Power is transmitted to the TO shaft 24.

【0011】また、前記前壁5dの前面には油圧式無段
変速装置を構成する油圧モータ29が配置され、該油圧
モータ29と前記油圧ポンプ23は前壁5dに対して前
後に振り分け配置されて、前後の重量バランス向上させ
ている。また、前壁5d内には油圧ポンプ23と油圧モ
ータ29を流体的に接続する油路を穿設してセンタセク
ションの役割を持たせている。このようにして油圧ポン
プ23と油圧モータ29により油圧式無段変速装置を構
成して主変速装置としており、油圧ポンプ2の斜板を主
変速レバー9と連結して、該主変速レバー9を回動する
ことによって、斜板の角度を変更し、油圧ポンプ23か
らの圧油の吐出量と吐出方向を変更し、油圧モータ29
の出力軸36の回転数及び回転方向が変更されて、出力
軸36を無段変速するようにしている。
A hydraulic motor 29, which constitutes a hydraulic stepless transmission, is disposed on the front surface of the front wall 5d, and the hydraulic motor 29 and the hydraulic pump 23 are disposed in front of and behind the front wall 5d. The weight balance before and after is improved. Further, an oil passage that fluidly connects the hydraulic pump 23 and the hydraulic motor 29 is formed in the front wall 5d to serve as a center section. In this manner, the hydraulic continuously variable transmission is constituted by the hydraulic pump 23 and the hydraulic motor 29 as a main transmission. The swash plate of the hydraulic pump 2 is connected to the main transmission lever 9 and the main transmission lever 9 is connected to the main transmission. By rotating, the angle of the swash plate is changed, and the discharge amount and discharge direction of the hydraulic oil from the hydraulic pump 23 are changed.
The rotation speed and rotation direction of the output shaft 36 are changed so that the output shaft 36 is continuously variable.

【0012】そして、前記油圧モータ29の出力軸36
を第一ケース5aと前壁5dに回転自在に支持し、第一
ケース5a内の出力軸36上に出力歯車37が固設さ
れ、該出力歯車37は前記中間軸26の端部上に固設し
た走行入力歯車38と噛合している。該中間軸26の後
部には一速歯車41、二速歯車42、三速歯車43が固
設され、該一速歯車41は走行出力軸27上に遊嵌した
遊嵌歯車44と噛合し、二速歯車42は走行出力軸27
上に摺動可能にスプライン嵌合した摺動歯車45と噛合
可能とされ、三速歯車43は走行出力軸27上に遊嵌し
た遊嵌歯車46と噛合させている。そして、前記摺動歯
車45をアームやリンク等を介して座席8近傍に配置し
た副変速レバーと連動連結して、副変速レバーの回動に
より摺動歯車45を摺動できるようにしている。
The output shaft 36 of the hydraulic motor 29
Is rotatably supported on the first case 5a and the front wall 5d, and an output gear 37 is fixed on an output shaft 36 in the first case 5a. The output gear 37 is fixed on an end of the intermediate shaft 26. And the running input gear 38 provided. A first-speed gear 41, a second-speed gear 42, and a third-speed gear 43 are fixedly provided at a rear portion of the intermediate shaft 26, and the first-speed gear 41 meshes with a free-fitting gear 44 loosely fitted on the traveling output shaft 27, The second speed gear 42 is connected to the traveling output shaft 27.
The third speed gear 43 is meshed with a loose fitting gear 46 loosely fitted on the traveling output shaft 27. The sliding gear 45 is linked to an auxiliary transmission lever disposed near the seat 8 via an arm, a link, or the like so that the sliding gear 45 can slide by rotating the auxiliary transmission lever.

【0013】このようにギア式の副変速装置を構成し
て、副変速レバーを回動することによって、摺動歯車4
5が摺動され、遊嵌歯車44の爪部と摺動歯車45の爪
部を噛合させることによって一速の副変速ができ、二速
歯車42と摺動歯車45を噛合させることによって二速
の副変速ができ、遊嵌歯車46の爪部と摺動歯車45の
爪部を噛合させることによって三速の副変速ができる。
[0013] The gear type auxiliary transmission is constructed as described above, and by rotating the auxiliary transmission lever, the sliding gear 4 is rotated.
5 is slid, and the claw portion of the loose fitting gear 44 and the claw portion of the sliding gear 45 are engaged with each other to perform a first-speed sub-shift. By engaging the claw portion of the loose fitting gear 46 with the claw portion of the sliding gear 45, a third-speed auxiliary speed change can be performed.

【0014】そして、走行出力軸27の後端にピニオン
47が固設され、該ピニオン47はデフギア装置48の
リングギア49と噛合され、変速後の動力を該デフギア
装置48,リアアクスルケース13内の減速歯車を介し
て後車軸に動力を伝えて後輪14に動力を伝える構成と
している。
A pinion 47 is fixed to the rear end of the traveling output shaft 27. The pinion 47 is meshed with a ring gear 49 of a differential gear device 48, and the power after shifting is transmitted to the differential gear device 48 and the rear axle case 13. The power is transmitted to the rear axle via the reduction gears, and the power is transmitted to the rear wheels 14.

【0015】また、前記走行出力軸27の前端は第一ケ
ース5a内に挿入されて、その端部上に歯車50が固設
され、該第一ケース5a内下部に配置した前輪増速切換
装置51に動力を伝える構成としている。この前輪増速
切換装置51は前記油圧モータ29を前壁5dの前面に
配置したことで、その空いた第一ケース5a内の空間に
配置しており、よって前輪増速切換装置51はミッショ
ンケース5より下方に突出することなく、ミッションケ
ース5内に収容できるようになっているのである。そし
て、該前輪増速切換装置51より変速した後の動力は、
前輪駆動出力軸53の前端から、ユニバーサルジョイン
ト、伝動軸等を介してフロントアクスルケース11に動
力を伝えて、前輪12を駆動する構成としている。
The front end of the traveling output shaft 27 is inserted into the first case 5a, and a gear 50 is fixed on the end of the front output shaft 27. It is configured to transmit power to 51. The front wheel speed changeover device 51 is arranged in the empty space inside the first case 5a by disposing the hydraulic motor 29 on the front surface of the front wall 5d. Thus, it can be accommodated in the transmission case 5 without protruding below the transmission case 5. The power after shifting from the front wheel speed increasing switching device 51 is:
The front wheel 12 is driven by transmitting power from the front end of the front wheel drive output shaft 53 to the front axle case 11 via a universal joint, a transmission shaft, and the like.

【0016】前記前輪増速切換装置51の構成を図2、
図3、図4より詳述する。前記第一ケース5aとセンタ
ープレート5cの下部に伝動軸52と前輪駆動出力軸5
3が前後方向に回転自在に支持され、該伝動軸52の前
後上には同速歯車54と増速歯車55が固設され、該同
速歯車54と増速歯車55は前輪駆動出力軸53上に回
転自在に遊嵌した遊嵌歯車56・57とそれぞれ噛合し
ている。該遊嵌歯車56の前側面には爪部56aが形成
され、遊嵌歯車57の後部にはボール嵌入部57aが形
成されている。
The structure of the front wheel speed increasing switching device 51 is shown in FIG.
Details will be described with reference to FIGS. A transmission shaft 52 and a front wheel drive output shaft 5 are provided below the first case 5a and the center plate 5c.
3 is rotatably supported in the front-rear direction, and the same speed gear 54 and a speed increasing gear 55 are fixed on the front and rear of the transmission shaft 52, and the same speed gear 54 and the speed increasing gear 55 are connected to a front wheel drive output shaft 53. The loosely fitted gears 56 and 57 rotatably fitted on the upper surface are in mesh with each other. A claw portion 56a is formed on a front side surface of the loose fitting gear 56, and a ball fitting portion 57a is formed on a rear portion of the loose fitting gear 57.

【0017】また、前記遊嵌歯車56と遊嵌歯車57と
の間の前輪駆動出力軸53上には係合体59が固設さ
れ、かつ、摺動体60が摺動自在に外嵌されている。該
係合体59と摺動体60の間には更にバネ58が配置さ
れ、該バネ58によって摺動体60を後方へ摺動するよ
うに付勢し、該摺動体60の後面側に形成した爪部60
aが前記遊嵌歯車56の前面側に形成した爪部56aに
噛合わせるようにして、後述する低速でハンドル7が直
進状態のときや高速走行時には前輪12と後輪14が同
速で駆動するようにし、低速でハンドル7を設定角度以
上回動したときに摺動体60が摺動されて、爪部60a
と爪部56aの噛合が外れるようにして、爪クラッチを
形成している。
An engaging body 59 is fixedly mounted on the front wheel drive output shaft 53 between the loose fitting gear 56 and the loose fitting gear 57, and a sliding body 60 is slidably fitted outside. . A spring 58 is further disposed between the engaging body 59 and the sliding body 60, and the spring 58 biases the sliding body 60 so as to slide backward, and a claw portion formed on the rear surface side of the sliding body 60. 60
The front wheel 12 and the rear wheel 14 are driven at the same speed when the handle 7 is in a straight-ahead state at a low speed, which will be described later, or when the vehicle is running at a high speed. As described above, when the handle 7 is rotated at a low speed or more than the set angle, the sliding body 60 is slid and the claw portion 60a
The pawl clutch is formed such that the pawl portion 56a is disengaged from the pawl portion 56a.

【0018】前記摺動体60の前面側には筒状の押圧部
60bが形成され、該押圧部60bの内周面は軸心から
の距離(半径)が異なる階段状に形成され、一方、前記
遊嵌歯車57のボール嵌入部57aにはクラッチボール
61が嵌入され、該クラッチボール61は前記押圧部6
0bの大径部で抜け止めされ、摺動体60を摺動して押
圧部60bの小径部でクラッチボール61を前記ボール
嵌入部57aに押し込んで、ボール嵌入部57aと係合
体59の両者に跨がって位置させることにより、遊嵌歯
車57よりクラッチボール61、係合体59を介して前
輪駆動出力軸53に動力を伝えるようにしてボールクラ
ッチを形成している。このようにして前輪駆動出力軸5
3の後側に、前輪12と後輪14を同速で駆動するよう
に切り換えるクラッチを爪クラッチ式とし、その前側に
増速で駆動するように切り換えるクラッチをボールクラ
ッチ式としている。
A cylindrical pressing portion 60b is formed on the front side of the sliding member 60, and the inner peripheral surface of the pressing portion 60b is formed in a step shape having a different distance (radius) from the axis. A clutch ball 61 is fitted into a ball fitting portion 57a of the loose fitting gear 57, and the clutch ball 61 is
0b, the clutch ball 61 is pushed into the ball fitting portion 57a by sliding the sliding member 60 and the small diameter portion of the pressing portion 60b, and straddles both the ball fitting portion 57a and the engaging body 59. The ball clutch is formed by transmitting the power from the loosely fitted gear 57 to the front wheel drive output shaft 53 via the clutch ball 61 and the engagement body 59 by being positioned at the bent position. Thus, the front wheel drive output shaft 5
The clutch for switching the front wheel 12 and the rear wheel 14 so as to drive them at the same speed is a claw clutch type on the rear side, and the ball clutch type clutch for switching the front wheel 12 and the rear wheel 14 so as to drive them at an increased speed.

【0019】そして、前記摺動体60を摺動操作するた
めに、図4、図5に示すように、シフトフォーク62の
一端が摺動体60に係合され、該シフトフォーク62の
ボス部62aがシフター軸63に摺動自在に外嵌され、
該ボス部62aの凹部にアーム64の一端が嵌入され、
該アーム64の他端は変速操作軸65に回転自在に枢支
され、アーム64の中途部にはピン孔64aが開口され
ている。前記変速操作軸65は第一ケース5aに回動自
在に支持され、該変速操作軸65の他端は第一ケース5
aより突出して、その第一ケース5a外の端部にアーム
71を固定し、該アーム71はリンク等を介して、ハン
ドル7の回転を前輪12のナックルアームに伝える伝動
系に連結され、ハンドル7の回動に連動して変速操作軸
65が回動するようにしている。
4 and 5, one end of the shift fork 62 is engaged with the slide body 60, and the boss 62a of the shift fork 62 is engaged with the slide body 60, as shown in FIGS. Is slidably fitted on the shifter shaft 63,
One end of the arm 64 is fitted into the recess of the boss portion 62a,
The other end of the arm 64 is rotatably supported by a speed change operation shaft 65, and a pin hole 64 a is opened in the middle of the arm 64. The shift operation shaft 65 is rotatably supported by the first case 5a, and the other end of the shift operation shaft 65 is connected to the first case 5a.
a arm 71 is fixed to an end of the first case 5a outside the first case 5a, and the arm 71 is connected to a transmission system for transmitting the rotation of the handle 7 to a knuckle arm of the front wheel 12 via a link or the like. The speed change operation shaft 65 is rotated in conjunction with the rotation of the gear 7.

【0020】また、該変速操作軸65上には前記アーム
64と平行に牽制アーム66の基部が変速操作軸65の
軸心方向に摺動自在、かつ、相対回転不能に外嵌され、
該牽制アーム66の先端には牽制ピン67が突出され、
前記アーム64の中途部に開口したピン孔64aに挿入
できるようにしている。
A base of a restraining arm 66 is fitted on the speed change operation shaft 65 in a direction parallel to the arm 64 so as to be slidable in the axial direction of the speed change operation shaft 65 and relatively non-rotatable.
At the tip of the restraining arm 66, a restraining pin 67 is projected,
The arm 64 can be inserted into a pin hole 64a opened in the middle of the arm 64.

【0021】そして、前記牽制アーム66の基部には牽
制操作アーム68の先端に設けたピン68aが係合さ
れ、該牽制操作アーム68の基部は牽制操作軸69に固
定され、該牽制操作軸69の他端は第一ケース5aより
外側に突出して、その端部にアーム70を固定し、該ア
ーム70は図外の牽制リンクに接続されている。該牽制
リンクは副変速装置の副変速レバーまたは該副変速レバ
ーに連動するリンク並びに倍速入切用レバーと連結され
ている。
A pin 68a provided at the tip of the traction operation arm 68 is engaged with the base of the traction arm 66, and the base of the traction operation arm 68 is fixed to the traction operation shaft 69. The other end protrudes outside the first case 5a, and an arm 70 is fixed to the end of the other end, and the arm 70 is connected to a traction link (not shown). The check link is connected to a sub-transmission lever of the sub-transmission, a link interlocked with the sub-transmission lever, and a double-speed on / off lever.

【0022】このような構成において、副変速装置が二
速、三速(高速)のときは、走行速度が速くなるため
に、旋回時に前輪を増速駆動すると急旋回して危険であ
るため、増速側クラッチが「接」とならないようにして
いる。つまり、副変速レバーを二速または三速に変速す
ると倍速入切用レバーが「切」になると共に、リンク等
を介してアーム70が回動され、牽制操作軸69を介し
て牽制操作アーム68が回動されて、牽制アーム66が
図6に示すように右方へ摺動され、牽制アーム66に固
定した牽制ピン67がピン孔64aより抜ける。この状
態ではハンドル7を回転してアーム71が回転されて
も、変速操作軸65に対してアーム64は枢支されてい
るので回動されず、アーム64に係合されたシフトフォ
ーク62も摺動されないために、前輪増速切換装置51
は摺動体60がバネ58により付勢されて爪部60aと
爪部56aが噛合した、前輪12と後輪14の同速駆動
とされるのである。
In such a configuration, when the auxiliary transmission is in the second speed or the third speed (high speed), the traveling speed is increased. The speed increasing clutch is prevented from coming into contact. That is, when the auxiliary transmission lever is shifted to the second speed or the third speed, the double speed on / off lever is turned “off”, the arm 70 is rotated via a link or the like, and the traction operation arm 68 is transmitted via the traction operation shaft 69. Is rotated, the restraining arm 66 is slid rightward as shown in FIG. 6, and the restraining pin 67 fixed to the restraining arm 66 is pulled out of the pin hole 64a. In this state, even if the arm 71 is rotated by rotating the handle 7, the arm 64 is pivotally supported with respect to the speed change operation shaft 65, so that the arm 64 is not rotated, and the shift fork 62 engaged with the arm 64 also slides. The front wheel speed changeover device 51
Is that the front wheel 12 and the rear wheel 14 are driven at the same speed when the sliding body 60 is urged by the spring 58 and the claw portions 60a and 56a mesh with each other.

【0023】また、副変速レバーを一速に変速し、倍速
入切用レバーを「入」にすると、アーム70、牽制操作
軸69、牽制操作アーム68が回動され、牽制アーム6
6は図4で示す位置に摺動され、牽制ピン67がピン孔
64aに入り係合して、旋回時にハンドル7を回転して
設定角度以上となると、アーム71の回動が変速操作軸
65、牽制アーム66を介してアーム64を回動し、該
アーム64に係合されたシフトフォーク62が摺動され
て摺動体60は前方へ摺動し、爪部56aと爪部60a
の噛合が外れて、クラッチボール61がボール嵌入部5
7aと係合体59に係合して、歯車50からの動力は、
同速歯車54、伝動軸52、増速歯車55、遊嵌歯車5
7、クラッチボール61、係合体59、前輪駆動出力軸
53と伝えられて、前輪12を増速駆動するのである。
When the sub-shift lever is shifted to the first speed and the double-speed on / off lever is turned on, the arm 70, the restraining operation shaft 69 and the restraining operation arm 68 are rotated, and the restraining arm 6 is rotated.
6 is slid to the position shown in FIG. 4 and when the restraining pin 67 enters and engages with the pin hole 64a and rotates the handle 7 at the time of turning to reach a set angle or more, the rotation of the arm 71 causes the shift operation shaft 65 to rotate. The arm 64 is rotated via the restraining arm 66, the shift fork 62 engaged with the arm 64 is slid, and the sliding body 60 slides forward, and the claw 56a and the claw 60a are moved.
Is disengaged, and the clutch ball 61 is disengaged from the ball fitting portion 5.
7a is engaged with the engagement body 59, and the power from the gear 50 is
Same speed gear 54, transmission shaft 52, speed increasing gear 55, loose fitting gear 5
7, the clutch ball 61, the engaging body 59, and the front wheel drive output shaft 53 are transmitted to drive the front wheel 12 at an increased speed.

【0024】[0024]

【発明の効果】本発明は以上の如く構成したので、次の
ような効果を奏するのである。即ち、請求項1の如く、
油圧式無段変速装置を支持する第一ケースとギア式変速
装置を支持する第二ケースとを前後に連結して後輪伝動
系を構成した作業車両の走行駆動装置において、前記ギ
ア式変速装置の出力軸と同期回転する伝動軸、並びに、
前輪駆動出力軸を前記第一ケース内に平行させて設け、
両軸間に、前輪への駆動回転を後輪に対して増速又は略
同速に切換可能な前輪増速切換装置を構成すると共に前
輪駆動出力軸を前記第一ケースの前面より突出させたの
で、前輪増速切換装置がミッションケース下方へ大きく
突出することがなく、地上高を上げることができて、前
輪増速切換装置をコンパクトに第一ケース内に収容し
て、保護することができる。そして、前輪増速切換装置
の出力軸は第一ケースの前面より前方へ突出されるよう
になり、フロントアクスルケースとの間が短くなり、前
輪に動力を伝える伝動軸を短くできてコスト低減化を図
ることができる。
As described above, the present invention has the following advantages. That is, as in claim 1,
A traveling drive device for a work vehicle in which a first case supporting a hydraulic type continuously variable transmission and a second case supporting a gear type transmission are connected back and forth to form a rear wheel transmission system. A transmission shaft that rotates synchronously with the output shaft of
A front wheel drive output shaft is provided in parallel in the first case,
Between both shafts, a front wheel speed-up switching device capable of switching the driving rotation to the front wheels to or substantially the same speed as the rear wheels is configured, and the front wheel drive output shaft is projected from the front surface of the first case. Therefore, the front wheel speed changeover device can be raised above the ground without greatly protruding below the transmission case, and the front wheel speed changeover device can be compactly housed in the first case and protected. . The output shaft of the front wheel speed changeover device protrudes forward from the front of the first case, shortening the distance between the front axle case and the transmission shaft that transmits power to the front wheels can be shortened, reducing costs. Can be achieved.

【0025】また、前輪増速切換装置において、同速駆
動系のクラッチを爪クラッチ式に構成すると共に、増速
駆動系のクラッチをボールクラッチ式に構成した実施例
のものでは、従来の同速駆動系及び増速駆動系の両者を
摩擦クラッチ式とする場合に比べて部品点数が少なくて
済み、組立工数も減少できてコスト低減化を図ることが
できる。
In the front wheel speed increasing switching device, the clutch of the same speed drive system is configured as a pawl clutch type, and the clutch of the speed increase drive system is configured as a ball clutch type. Compared to the case where both the drive system and the speed-up drive system are of the friction clutch type, the number of parts is smaller, the number of assembly steps can be reduced, and the cost can be reduced.

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

【図1】本発明の前輪増速切換装置を搭載したトラクタ
の全体側面図である。
FIG. 1 is an overall side view of a tractor equipped with a front wheel speed increasing switching device of the present invention.

【図2】動力伝達機構を示すスケルトン図である。FIG. 2 is a skeleton diagram showing a power transmission mechanism.

【図3】前輪増速切換装置の側面断面図である。FIG. 3 is a side sectional view of the front wheel speed increasing switching device.

【図4】同じく正面断面図である。FIG. 4 is a front sectional view of the same.

【図5】図4におけるX−X矢視断面図である。FIG. 5 is a sectional view taken along the line XX in FIG. 4;

【図6】副変速が高速段に変速された状態の前輪増速切
換装置の正面断面図である。
FIG. 6 is a front cross-sectional view of the front wheel speed increasing switching device in a state where the subtransmission is shifted to a high speed stage.

【符号の説明】[Explanation of symbols]

5a 第一ケース 5b 第二ケース 5d 前壁 12 前輪 14 後輪 23 油圧ポンプ 27 出力軸 29 油圧モータ 51 前輪増速切換装置 52 伝動軸 53 前輪駆動出力軸 5a First case 5b Second case 5d Front wall 12 Front wheel 14 Rear wheel 23 Hydraulic pump 27 Output shaft 29 Hydraulic motor 51 Front wheel speed increasing switching device 52 Transmission shaft 53 Front wheel drive output shaft

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 油圧式無段変速装置を支持する第一ケー
スとギア式変速装置を支持する第二ケースとを前後に連
結して後輪伝動系を構成した作業車両の走行駆動装置に
おいて、前記ギア式変速装置の出力軸と同期回転する伝
動軸、並びに、前輪駆動出力軸を前記第一ケース内に平
行させて設け、両軸間に、前輪への駆動回転を後輪に対
して増速又は略同速に切換可能な前輪増速切換装置を構
成すると共に前輪駆動出力軸を前記第一ケースの前面よ
り突出させたことを特徴とする作業車両の走行駆動装
置。
1. A traveling drive device for a working vehicle in which a first case supporting a hydraulic type continuously variable transmission and a second case supporting a gear type transmission are connected back and forth to form a rear wheel transmission system. A transmission shaft that rotates synchronously with the output shaft of the gear type transmission and a front wheel drive output shaft are provided in parallel in the first case, and the drive rotation to the front wheels is increased between the two shafts relative to the rear wheels. A traveling drive device for a working vehicle, comprising a front wheel speed-increasing switching device capable of switching to a speed or substantially the same speed, and a front wheel drive output shaft protruding from a front surface of the first case.
JP14951398A 1998-05-29 1998-05-29 Traveling driving device for work vehicle Pending JPH11334401A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14951398A JPH11334401A (en) 1998-05-29 1998-05-29 Traveling driving device for work vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14951398A JPH11334401A (en) 1998-05-29 1998-05-29 Traveling driving device for work vehicle

Publications (1)

Publication Number Publication Date
JPH11334401A true JPH11334401A (en) 1999-12-07

Family

ID=15476794

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14951398A Pending JPH11334401A (en) 1998-05-29 1998-05-29 Traveling driving device for work vehicle

Country Status (1)

Country Link
JP (1) JPH11334401A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013018405A1 (en) * 2011-08-04 2013-02-07 株式会社小松製作所 Backhoe loader

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013018405A1 (en) * 2011-08-04 2013-02-07 株式会社小松製作所 Backhoe loader
JP2013036498A (en) * 2011-08-04 2013-02-21 Komatsu Ltd Backhoe loader
GB2496997B (en) * 2011-08-04 2013-10-23 Komatsu Mfg Co Ltd Backhoe loader
US8689664B2 (en) 2011-08-04 2014-04-08 Komatsu Ltd. Backhoe loader

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