JPH0667691B2 - Four-wheel drive work vehicle - Google Patents
Four-wheel drive work vehicleInfo
- Publication number
- JPH0667691B2 JPH0667691B2 JP62283806A JP28380687A JPH0667691B2 JP H0667691 B2 JPH0667691 B2 JP H0667691B2 JP 62283806 A JP62283806 A JP 62283806A JP 28380687 A JP28380687 A JP 28380687A JP H0667691 B2 JPH0667691 B2 JP H0667691B2
- Authority
- JP
- Japan
- Prior art keywords
- front wheel
- transmission
- output shaft
- wheel transmission
- wheel
- 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
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、四輪駆動型作業車における前輪変速装置の配
置構造等に関する。TECHNICAL FIELD The present invention relates to an arrangement structure and the like of a front wheel transmission in a four-wheel drive work vehicle.
近年では、後輪駆動速度と略等しい駆動速度で前輪に伝
動する標準駆動状態と、後輪駆動速度より大きい駆動速
度で前輪に伝動する増速駆動状態とに切換可能な前輪変
速装置を装備した四輪駆動型作業車が現れてきている。
これにより、旋回時に前輪変速装置を増速駆動側に切換
操作することによって地面を荒らすことなく、軟弱な地
面でも容易に小回り旋回が行える。In recent years, a front wheel transmission is equipped that can switch between a standard drive state in which the front wheel is transmitted at a drive speed substantially equal to the rear wheel drive speed and an increased drive state in which the front wheel is transmitted at a drive speed higher than the rear wheel drive speed. Four-wheel drive type work vehicles are appearing.
This makes it possible to easily make a small turning turn even on a soft ground without roughening the ground by switching the front wheel transmission to the speed-increasing drive side during turning.
このような四輪駆動型作業車の一例である農用トラクタ
においては、前輪変速装置を機体後部のトランスミッシ
ョン内に設けて、操縦ハンドルを設定角度以上に操向操
作すると、これに連動して前輪変速装置が増速駆動側に
切換操作されるように構成しているものがある。In an agricultural tractor, which is an example of such a four-wheel drive type work vehicle, a front wheel transmission is provided in the transmission at the rear of the machine body, and when the steering handle is steered over a set angle or more, the front wheel transmission is linked with this. Some devices are configured to be switched to the speed-increasing drive side.
前述のように、比較的重量物である前輪変速装置を機体
後部のトランスミッション内に装備すると、機体後部側
の重量が前側に比べてどうしても重くなる傾向になって
しまう。そして、農用トラクタにおいては、機体後部に
ロータリ耕耘装置等の作業装置を連結する場合が多く、
このように作業装置を機体後部に連結すると、機体の重
心がさらに後側に片寄った状態となってしまう。As described above, when the front wheel transmission, which is relatively heavy, is installed in the transmission at the rear of the machine, the weight of the rear of the machine tends to be heavier than that of the front. And, in the agricultural tractor, a working device such as a rotary tiller is often connected to the rear part of the machine body,
When the working device is connected to the rear part of the machine body in this way, the center of gravity of the machine body is further biased to the rear side.
このように機体の重心が後側に片寄って、前輪の支持荷
重が小さくなりすぎると、前輪の駆動力が地面に対して
十分に伝えられなくなり四輪駆動の利点が低下して、前
輪変速装置による小回り旋回が充分に行えない場合が生
じてしまう。If the center of gravity of the airframe is biased to the rear side and the supporting load of the front wheels becomes too small, the driving force of the front wheels cannot be sufficiently transmitted to the ground, and the advantage of four-wheel drive is reduced, and the front wheel transmission is reduced. In some cases, it may not be possible to make a small turning turn due to.
従って、このような状態を防止するには、機体前部に十
分な重量のバランスウェイトを装着すればよいのである
が、バランスウェイトを多く装着し過ぎると、機体全体
の重量増加を伴うので好ましい手段とは言えない。Therefore, in order to prevent such a state, it is sufficient to mount a balance weight having a sufficient weight on the front portion of the machine body. However, if too many balance weights are mounted, the weight of the entire machine body is increased, which is a preferable means. It can not be said.
本発明は特に大重量のバランスウェイトを装着しなくて
も、前輪変速装置による小回り旋回が支障なく行えるよ
うに構成することを目的としている。It is an object of the present invention to configure a front wheel transmission so that a small turning turn can be performed without trouble, even without mounting a heavy weight balance weight.
本発明の特徴は以上のような四輪駆動型作業車におい
て、次のように構成することにある。A feature of the present invention is that the four-wheel drive type work vehicle as described above is configured as follows.
操向自在な前輪に伝達される動力を、前輪と後輪の駆動
速度が略等しくなる標準駆動状態と、前輪の駆動速度が
後輪よりも大きくなる増速駆動状態とに切換変速する前
輪変速装置を備えて、 前輪変速装置を、機体前部における前車軸ケースの後部
の機体固定部位に連結固定し、前輪変速装置の前向きの
出力軸を、前車軸ケースの後向きの入力軸に接続すると
共に、 前輪変速装置の入力軸を前輪変速装置の出力軸の上側で
後向きに配置し、機体後部に設けられたトランスミッシ
ョンからの前輪出力軸を、前輪変速装置の入力軸を接続
してある。Front-wheel shifting, in which the power transmitted to the steerable front wheels is switched between a standard driving state in which the driving speeds of the front and rear wheels are approximately equal, and an increased driving state in which the driving speed of the front wheels is greater than that of the rear wheels. The front wheel transmission is connected and fixed to the rear body of the front axle case in the front of the machine, and the front output shaft of the front wheel transmission is connected to the rear input shaft of the front axle case. The input shaft of the front wheel transmission is arranged rearward above the output shaft of the front wheel transmission, and the front wheel output shaft from the transmission provided at the rear of the machine is connected to the input shaft of the front wheel transmission.
（ｉ） 本発明のように構成すると例えば第２図に示すように、
機体前部に連結固定された前輪変速装置（10）により、
機体後部側に片寄っていた機体の重心が機体前部側に移
動することになって、前輪及び後輪の支持荷重を極端な
片寄りのない、バランスの良いものに設定することがで
きる。(I) When configured as in the present invention, for example, as shown in FIG.
By the front wheel transmission (10) connected and fixed to the front of the machine,
The center of gravity of the machine body, which has been offset to the rear side of the machine body, is moved to the front side of the machine body, so that the supporting loads of the front wheels and the rear wheels can be set to a well-balanced one without any extreme deviation.
（ii） 本発明では例えば第１図及び第２図に示すように、前輪
変速装置（10）の入力軸（12）を出力軸（13）の上側に
配置しているので、この入力軸（12）の位置が地面から
上方に離れた高い位置となっている。(Ii) In the present invention, as shown in FIG. 1 and FIG. 2, for example, the input shaft (12) of the front wheel transmission (10) is arranged above the output shaft (13). The position of 12) is a high position, which is separated from the ground upward.
これにより、機体後部のトランスミッション（６）から
の前輪出力軸（15）を、前輪変速装置（10）の入力軸
（12）に接続する場合、前輪出力軸（15）の位置も地面
から上方に離れた高い位置となるので、前輪（１）と後
輪（２）との間の空間において、特に上下幅を大きなも
のにすることができる。As a result, when the front wheel output shaft (15) from the transmission (6) at the rear of the machine is connected to the input shaft (12) of the front wheel transmission (10), the position of the front wheel output shaft (15) also moves upward from the ground. Since the positions are separated and high, the vertical width can be made particularly large in the space between the front wheel (1) and the rear wheel (2).
従って、例えば前輪（１）と後輪（２）との間の機体固
定部にモーア等の作業装置を連結して支持する場合、前
輪出力軸（15）が作業装置に接触したりして邪魔になる
ようなことがない。Therefore, for example, when a working device such as a mower is connected to and supported by the machine body fixing portion between the front wheel (1) and the rear wheel (2), the front wheel output shaft (15) may come into contact with the working device and interfere. There is no such thing as.
以上のように、前輪及び後輪の支持荷重のバランスを四
輪駆動型作業車にとって好ましいものにすることができ
て、前輪変速装置による小回り旋回が支障なく行えるよ
うになり、四輪駆動型作業車の旋回性能を向上させるこ
とができた。As described above, the balance of the supporting load of the front wheels and the rear wheels can be made favorable for the four-wheel drive type work vehicle, and the small-turn turning by the front wheel transmission can be performed without any trouble. We were able to improve the turning performance of the car.
又、前輪変速装置への前輪出力軸を高い位置に設置し
て、前輪と後輪との間の作業装置を支障なく連結支持す
ることができるようになり、作業装置に関する四輪駆動
型作業車の機能性を向上させることができる。Further, the front wheel output shaft to the front wheel transmission can be installed at a high position so that the working device between the front wheel and the rear wheel can be connected and supported without hindrance. The functionality of can be improved.
以下、本発明の実施例の１つである四輪駆動型の農用ト
ラクタについて図面に基づいて説明する。A four-wheel drive agricultural tractor, which is one of the embodiments of the present invention, will be described below with reference to the drawings.
第２図に示すように、左右一対の操向型の前輪（１）及
び後輪（２）の各々を駆動自在に支持した機体フレーム
（３）の前部にエンジン（４）、主クラッチ（５）３後
部にトランスミッション（６）及び操縦部（７）を搭載
し、後部にロータリー耕耘装置等の各種の作業装置を昇
降自在に連結するリフトアーム（８）、及び作業装置に
動力を伝達するPTO軸（９）を備えて、四輪駆動型の農
用トラクタを構成している。As shown in FIG. 2, an engine (4) and a main clutch () are provided in front of a body frame (3) that movably supports a pair of left and right steering type front wheels (1) and rear wheels (2). 5) 3 A transmission (6) and a control unit (7) are mounted on the rear part, and power is transmitted to the lift arm (8) for connecting various working devices such as a rotary tiller to the rear part and the working device. It is equipped with a PTO shaft (9) to form a four-wheel drive agricultural tractor.
次に、農用トラクタの動力伝達系について説明する。第
２図に示すようにエンジン（４）からの動力は、主クラ
ッチ（５）から主変速装置（図示せず）及び副変速装置
（図示せず）で構成されたトランスミッション（６）に
送られ、変速操作されて後輪（２）に伝達される。トラ
ンスミッション（６）の副変速装置から分岐した動力
が、前輪出力軸（15）から機体前部の前輪変速装置（1
0）に伝達され、変速操作されて前輪（１）に伝達され
るのである。Next, the power transmission system of the agricultural tractor will be described. As shown in FIG. 2, the power from the engine (4) is sent from the main clutch (5) to a transmission (6) composed of a main transmission (not shown) and an auxiliary transmission (not shown). , And is transmitted to the rear wheel (2) after being operated to change gears. The power branched from the auxiliary transmission of the transmission (6) is transmitted from the front wheel output shaft (15) to the front wheel transmission (1
It is transmitted to the front wheel (1) after being transmitted to the front wheel (1).
次に、前輪変速装置（10）について説明する。第１図及
び第２図に示すように、前輪出力軸（15）に接続される
入力軸（12）が、前輪変速装置（10）内の上側で後向き
に支持され、入力軸（12）の下側で前向きに出力軸（1
3）が支持されている。入力軸（12）に固定された第１
及び第２入力ギヤ（14），（16）が、出力軸（13）に遊
転自在に外嵌された第１及び第２出力ギヤ（17），（1
8）に咬み合っており、出力軸（13）に咬合部を有する
シフト部材（19）が、スプライン構造にてスライド操作
自在に取付けられている。そして、以上のような構造の
前輪変速装置（10）が、前車軸ケース（11）の後側の機
体フレーム（３）に連結固定されている。Next, the front wheel transmission (10) will be described. As shown in FIGS. 1 and 2, the input shaft (12) connected to the front wheel output shaft (15) is supported rearward on the upper side in the front wheel transmission (10), and The output shaft (1
3) is supported. First fixed to input shaft (12)
And the first and second output gears (17), (1) in which the second input gears (14), (16) are rotatably fitted onto the output shaft (13).
A shift member (19), which is engaged with 8) and has an occlusal portion on the output shaft (13), is slidably mounted in a spline structure. The front wheel transmission (10) having the above-described structure is connected and fixed to the rear body frame (3) of the front axle case (11).
前車軸ケース（11）は、ブラケット（20）及び前輪変速
装置（10）により機体の前後軸芯（P1）周りにローリン
グ自在に支持されており、前車軸ケース（11）内のデフ
機構（21）の入力軸（22）と、前輪変速装置（10）の出
力軸（13）とが接続されている。The front axle case (11) is rotatably supported by the bracket (20) and the front wheel transmission (10) around the longitudinal axis (P 1 ) of the machine body, and the diff mechanism (in the front axle case (11) ( The input shaft (22) of 21) and the output shaft (13) of the front wheel transmission (10) are connected.
前輪変速装置（10）のシフト部材（19）と操縦ハンドル
（23）とが機械的に連動連結してあり、直進状態におい
てシフト部材（19）は第１出力ギヤ（17）に咬み合っ
て、この状態で前輪（１）及び後輪（２）が略同速度で
駆動される標準駆動状態となる。そして、操縦ハンドル
（23）を設定角度以上に操向操作すると、シフト部材
（19）がスライド操作されて第２出力ギヤ（18）に咬み
合うのであり、この状態で前輪（１）が後輪（２）より
も増速される増速駆動状態となるのである。The shift member (19) of the front wheel transmission (10) and the steering wheel (23) are mechanically linked to each other, and the shift member (19) meshes with the first output gear (17) in a straight traveling state, In this state, the front wheels (1) and the rear wheels (2) are in a standard drive state in which they are driven at substantially the same speed. Then, when the steering handle (23) is steered over the set angle, the shift member (19) is slid and engaged with the second output gear (18). In this state, the front wheel (1) is rear wheel. Thus, the speed-up drive state in which the speed is higher than that in (2) is achieved.
〔別実施例〕 前述の実施例において、前輪変速装置（10）が前車軸ケ
ース（11）における片方のブラケットを兼ねる構造では
なく、２組のブラケットにより前車軸ケース（11）をロ
ーリング自在に支持する構造としてもよい。[Other Embodiments] In the above-described embodiments, the front wheel transmission (10) does not double as one bracket in the front axle case (11), but the front axle case (11) is supported by two brackets so as to be freely rollable. It may have a structure.
尚、特許請求の範囲の項に図面との対照を便利にする為
に符号を記すが、該記入により本発明は添付図面の構造
に限定されるものではない。It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.
図面は本発明に係る四輪駆動型作業車の実施例を示し、
第１図は前輪変速装置及びその取付け部付近の断面図、
第２図は農用トラクタの全体側面図である。 （１）……前輪、（２）……後輪、（６）……トランス
ミッション、（10）……前輪変速装置、（11）……前車
軸ケース、（12）……前輪変速装置の入力軸、（13）…
…前輪変速装置の出力軸、（15）……トランスミッショ
ンからの前輪出力軸、（22）……前車軸ケースの入力
軸。The drawings show an embodiment of a four-wheel drive type working vehicle according to the present invention,
FIG. 1 is a cross-sectional view of the front wheel transmission and its mounting portion,
FIG. 2 is an overall side view of the agricultural tractor. (1) …… front wheel, (2) …… rear wheel, (6) …… transmission, (10) …… front wheel transmission, (11) …… front axle case, (12) …… front wheel transmission input Axis, (13) ...
... output shaft of front wheel transmission, (15) ... front wheel output shaft from transmission, (22) ... input shaft of front axle case.
Claims (1)
を、前輪（１）と後輪（２）の駆動速度が略等しくなる
標準駆動状態と、前輪（１）の駆動速度が後輪（２）よ
りも大きくなる増速駆動状態とに切換変速する前輪変速
装置（10）を備えて、 前記前輪変速装置（10）を、機体前部における前車軸ケ
ース（11）の後部の機体固定部位に連結固定し、前記前
輪変速装置（10）の前向きの出力軸（13）を、前記前車
軸ケース（11）の後向きの入力軸（22）に接続すると共
に、 前記前輪変速装置（10）の入力軸（12）を前輪変速装置
（10）の前記出力軸（13）の上側で後向きに配置し、機
体後部に設けられたトランスミッション（６）からの前
輪出力軸（15）を、前輪変速装置（10）の前記入力軸
（12）に接続してある四輪駆動型作業車。Claims: 1. The power transmitted to the steerable front wheel (1) is changed between a standard driving state in which the driving speeds of the front wheel (1) and the rear wheel (2) are substantially equal to each other and a driving speed of the front wheel (1). The front wheel transmission (10) is provided to switch and change the speed to a speed-increasing drive state in which the front wheel transmission (10) is larger than the rear wheels (2). The front wheel transmission (10) is connected and fixed to a body fixing portion, and the front output shaft (13) of the front wheel transmission (10) is connected to the rear input shaft (22) of the front axle case (11). The input shaft (12) of 10) is arranged rearward above the output shaft (13) of the front wheel transmission (10), and the front wheel output shaft (15) from the transmission (6) provided at the rear of the machine is A four-wheel drive work vehicle connected to the input shaft (12) of a front wheel transmission (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62283806A JPH0667691B2 (en) | 1987-11-09 | 1987-11-09 | Four-wheel drive work vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62283806A JPH0667691B2 (en) | 1987-11-09 | 1987-11-09 | Four-wheel drive work vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01127417A JPH01127417A (en) | 1989-05-19 |
| JPH0667691B2 true JPH0667691B2 (en) | 1994-08-31 |
Family
ID=17670386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62283806A Expired - Lifetime JPH0667691B2 (en) | 1987-11-09 | 1987-11-09 | Four-wheel drive work vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0667691B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6331824A (en) * | 1986-07-25 | 1988-02-10 | Mitsubishi Agricult Mach Co Ltd | Front wheel driving device for agricultural tractor |
| JPH0623013B2 (en) * | 1987-06-25 | 1994-03-30 | 株式会社神崎高級工機製作所 | Front-wheel speed-up mechanism for turning four-wheel drive vehicles |
| JPH0634645B2 (en) * | 1987-09-14 | 1994-05-11 | 株式会社クボタ | Coupling device for tractor and work equipment |
-
1987
- 1987-11-09 JP JP62283806A patent/JPH0667691B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01127417A (en) | 1989-05-19 |
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