JPH0475524A - Transmission structure of tractor - Google Patents
Transmission structure of tractorInfo
- Publication number
- JPH0475524A JPH0475524A JP19155490A JP19155490A JPH0475524A JP H0475524 A JPH0475524 A JP H0475524A JP 19155490 A JP19155490 A JP 19155490A JP 19155490 A JP19155490 A JP 19155490A JP H0475524 A JPH0475524 A JP H0475524A
- Authority
- JP
- Japan
- Prior art keywords
- main shaft
- shaft
- transmission
- transmission mechanism
- type variable
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 63
- 230000007246 mechanism Effects 0.000 claims abstract description 55
- 230000005484 gravity Effects 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract 5
- 206010011878 Deafness Diseases 0.000 abstract 3
- 238000001816 cooling Methods 0.000 description 3
- 244000025254 Cannabis sativa Species 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Harvester Elements (AREA)
- Arrangement Of Transmissions (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、主としてミツドマウント型の芝刈機として使
用されるトラクタの伝動構造に係り、詳しくは、機体前
部に搭載された縦軸型のエンジンと、機体後部に搭載さ
れた走行用の伝動装置とを、ベルト伝動機構によって連
動連結してあるトラクタの伝動構造に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transmission structure for a tractor mainly used as a mid-mounted lawn mower, and more specifically, to a transmission structure for a tractor used as a mid-mounted lawn mower. The present invention relates to a transmission structure for a tractor in which a belt transmission mechanism is used to interlock and connect a driving transmission device mounted on the rear part of the machine body.
この種のトラクタの伝動構造としては、実開平１−１７
２３２６号公報で示されたもののように、エンジンから
のベルト伝動による回転をＨ３Ｔ（静油圧式無段変速装
置）に入力し、このＨ３Ｔの出力を走行用の伝動装置に
入力して後輪を駆動するように構成してあり、Ｈ３Ｔは
その人力ブーりの上方に配置されていた。The transmission structure of this type of tractor is
As shown in Publication No. 2326, the rotation from the engine through belt transmission is input to the H3T (hydrostatic continuously variable transmission), and the output of this H3T is input to the driving transmission to drive the rear wheels. It was configured to be driven, and the H3T was placed above the human-powered boot.
前記従来技術によれば比較的重量の重いＨ３Ｔか伝動ベ
ルトよりも上方位置に配設されているので、正逆転切換
機構等を含めた伝動装置全体としての重心、延いてはト
ラクタの重心位置が高くなる方向に少なからず影響を与
えていた。According to the prior art, the H3T, which is relatively heavy, is disposed above the transmission belt, so the center of gravity of the entire transmission device including the forward/reverse switching mechanism, etc., and by extension the center of gravity of the tractor, are This had a considerable influence on the rise in prices.
又、ゴルフ場のような起伏の多い作業地では傾斜地にお
ける芝刈作業もよく行われるものてあって、少しでも低
重心化した方が望ましいものである。Further, in work areas with many ups and downs such as golf courses, mowing work on slopes is often performed, so it is desirable to lower the center of gravity as much as possible.
本発明は伝動装置の構造工夫によって、伝動装置とじて
の低重心化を実現することを目的とする。An object of the present invention is to realize a lower center of gravity of the transmission device by devising the structure of the transmission device.
上記目的を達成するために本発明は、冒頭に記載したト
ラクタの伝動構造において、前記伝動装置を、ベルト伝
動機構によって入力された回転を無段に変速する摩擦式
無段変速機構、この無段変速機構の出力の回転方向を切
換え可能な正逆転切換機構、およびデフ機構から構成す
るとともに前記摩擦式無段変速機構を前記ベルト伝動機
構における入力ブーりの下方に配置し、その摩擦式無段
変速機構における左右向きの主軸の後方に前記デフ機構
における車軸を配設し、かつ、これら主軸と車軸との間
に、前記主軸とによって前記正逆転切換機構を構成する
中間軸を前記主軸と平行に配置してあることを特徴構成
とする。In order to achieve the above object, the present invention provides a friction-type continuously variable transmission mechanism that continuously changes the speed of rotation inputted by a belt transmission mechanism, in the tractor transmission structure described at the beginning. It is composed of a forward/reverse switching mechanism capable of switching the rotational direction of the output of the transmission mechanism, and a differential mechanism, and the friction type continuously variable transmission mechanism is arranged below the input boot of the belt transmission mechanism, and the friction type continuously variable transmission mechanism is arranged below the input boot of the belt transmission mechanism. The axle of the differential mechanism is disposed behind the left-right main shaft of the transmission mechanism, and between these main shafts and the axle, an intermediate shaft that constitutes the forward/reverse switching mechanism with the main shaft is arranged parallel to the main shaft. The characteristic configuration is that the
伝動装置の重心を下げるには上方に突出した状態のＨ３
Ｔを伝動ベルトの下側、つまり入力ブーりの下方に配置
するという手段か考えられる。しかしながら、Ｈ８Ｔに
は冷却ファンが必要であって、そのような回転体をモー
アの存在する機体下腹部に近づけることは安全上好まし
くないので、Ｈ３Ｔを入力ブーり下方に配置するのは困
難である。To lower the center of gravity of the transmission, H3 should be protruded upwards.
One possible solution would be to place the T under the transmission belt, that is, under the input boot. However, the H8T requires a cooling fan, and it is not desirable for safety to have such a rotating body close to the underbelly of the aircraft where the mower is located, so it is difficult to place the H3T below the input boob. .
それにひきかえ、Ｈ３Ｔと同様に無段変速機能を持つ摩
擦式無段変速機構ではそのケース外に冷却ファンといっ
た回転体を備えていないので、該摩擦式無段変速機構を
も入力ブーりの下方に位置させても、Ｈ３Ｔの場合のよ
うに冷却ファンに刈草や異物が絡み付いたりするといっ
た不具合か生じない。In contrast, the friction type continuously variable transmission mechanism, which has a continuously variable speed function like the H3T, does not have a rotating body such as a cooling fan outside the case, so the friction type continuously variable transmission mechanism is also placed below the input boolean. Even if it is positioned, there will be no problems such as grass clippings or foreign objects getting tangled in the cooling fan like in the case of the H3T.
そして、正逆転切換機構を構成する中間軸も主軸と車軸
との間に配置したことによって、伝動装置全体を従動ブ
ーりの下方位置に配設可能となる。Since the intermediate shaft constituting the forward/reverse switching mechanism is also disposed between the main shaft and the axle, the entire transmission device can be disposed below the driven boot.
その結果、重量物である伝動装置の低配置によって機体
全体としての低重心化に寄与でき、傾斜地でも安定して
芝刈りできるとか、よりきつい傾斜地での芝刈り作業が
可能となるといった具合に、ミッドマウントモーアとな
るトラクタに好適な伝動装置を提供することができた。As a result, the low placement of the heavy transmission equipment contributes to lowering the center of gravity of the entire machine, making it possible to stably mow lawns even on slopes, and even on steeper slopes. We were able to provide a transmission device suitable for a mid-mount mower tractor.
第３図に前部に縦軸型のエンジン（１）を備え、中央部
に操縦部（２）を配置し、後部に伝動装置（Ａ）を搭載
した機体（３）を、前後軸（４）、 （５）で走行可能
に構成するとともに、機体下腹部にモーア（６）を吊設
した芝刈用のトラクタが示されている。伝動装置ｔ （
Ａ）とモーア（６）とはいずれもベルト伝動機構（７）
、 （８）によってエンジン（１）の動力を入力するよ
うに構成してある。Figure 3 shows a fuselage (3) equipped with a longitudinal axis engine (1) at the front, a control unit (2) located at the center, and a transmission (A) at the rear. ), (5) shows a lawn mowing tractor configured to be movable and having a mower (6) suspended from the lower abdomen of the machine. Transmission device t (
A) and mower (6) are both belt transmission mechanisms (7)
, (8) is configured to input the power of the engine (1).
次に、伝動装置（Ａ）について説明する。Next, the transmission device (A) will be explained.
第１図に示すように伝動装置（Ａ）は、ベルト伝動機構
（７）によってエンジン（１）動力を入力する動力入力
部（Ｂ）、入力された動力を無段に変速する摩擦式無段
変速機構（以下ＣＶＴと略称する）（Ｃ）、このＣＶ
Ｔ （Ｃ）通過後の走行用動力の回転方向を切換可能な
正逆転切換機構（Ｄ）、及びデフ機構（Ｅ）等を備えて
構成されている。As shown in Fig. 1, the transmission device (A) includes a power input section (B) that inputs the power of the engine (1) through a belt transmission mechanism (7), and a friction type stepless transmission that continuously changes the speed of the input power. Transmission mechanism (hereinafter abbreviated as CVT) (C), this CV
T (C) It is configured to include a forward/reverse switching mechanism (D) that can switch the direction of rotation of the driving power after passing, a differential mechanism (E), and the like.
動力入力部（Ｂ）は、入カブーリ（９）を備えた縦軸（
１０）と、後述するＣ Ｖ Ｔ （Ｃ）の入力回転体（
１１）とをベベルギヤ連動して構成され、入力回転体（
１１）の軸部（１２）を延設して伝動ケース（１３）外
へ突出し、ＰＴＯ軸（Ｆ）を構成してある。The power input section (B) has a vertical shaft (
10) and the input rotating body (
11) is configured by interlocking the input rotating body (
The shaft portion (12) of 11) is extended and protrudes outside the transmission case (13) to form a PTO shaft (F).
ＣＶＴは、出力軸（１４）の周囲に、この出力軸（１４
）と同心状に配設される入力回転体（１１）によって前
記出力軸（１４）の軸心を中心として公転駆動される複
数の自転可能なテーパコーン（１５）を配備し、これら
テーパコーン（１５）に接触して駆動回転される出力回
転体（１６）を前記出力軸（１４）に取付けるとともに
、それらテーパコーン（１５）に亘って軸心方向にシフ
ト可能な変速部材（１７）を設けて構成されている。テ
ーパコーン（１５）はカム機構（１８）によって押圧付
勢される出力回転体（１６）と押圧接触し、この反力を
ディスク状のコーンサポート（１９）によって受けてい
るとともに、前記入力回転体（１１）に取付けられた外
枠（２０）と、この外枠（２０）に連結された内枠（２
１）とによってキャリア（２２）を形成し、テーパコー
ン（１５）を支軸（２３）を介して自転自在に支持して
ある。The CVT has an output shaft (14) around the output shaft (14).
) is provided with a plurality of rotatable taper cones (15) that are driven to revolve around the axis of the output shaft (14) by an input rotating body (11) that is arranged concentrically with the input rotating body (11), and these taper cones (15) An output rotating body (16) that is driven and rotated by contact with the output shaft (14) is attached to the output shaft (14), and a transmission member (17) that is shiftable in the axial direction is provided across the tapered cone (15). ing. The tapered cone (15) is in pressure contact with the output rotating body (16) which is biased by the cam mechanism (18), and this reaction force is received by the disk-shaped cone support (19), and the input rotating body ( 11) and an inner frame (20) connected to this outer frame (20).
1) forms a carrier (22), and supports the taper cone (15) via a support shaft (23) so as to be freely rotatable.
正逆転切換機構（Ｄ）は、前記出力軸（１４）と、一端
にブレーキ装置（２４）を備えた中間軸（２５）とに亘
って構成されている。すなわち、出力軸（１４）の駆動
ぎや（２６）と駆動スプロケット（２７）、中間軸（２
５）の従動ギヤ（２８）と従動スプロケット（２９）、
およびチェーン（３０）によって正逆の回転方向を現出
し、シフト回転具（３１）によって中間軸（２５）の回
転方向を選択する。The forward/reverse switching mechanism (D) is configured to span the output shaft (14) and an intermediate shaft (25) provided with a brake device (24) at one end. That is, the drive gear (26) of the output shaft (14), the drive sprocket (27), and the intermediate shaft (2
5) driven gear (28) and driven sprocket (29),
The chain (30) reveals forward and reverse rotation directions, and the shift rotary tool (31) selects the rotation direction of the intermediate shaft (25).
デフ機構（Ｅ）は、左右の車軸（３２）、 （３２）を
デフキャリア（３７）内部で嵌合するとともに、そのデ
フキャリア（３７）をチェーン機構（３３）によって中
間軸（２５）に連動連結してある。The differential mechanism (E) fits the left and right axles (32), (32) inside a differential carrier (37), and also links the differential carrier (37) to the intermediate shaft (25) by a chain mechanism (33). It is connected.
第２図に示すように、ＣＶ Ｔ （Ｃ）の出力軸（１４
）、中間軸（２５）および車軸（３２）は全て左右向き
であり、これらの軸を内装する伝動ケース（１３）の上
方に入カブーリ（９）か配設されている。As shown in Figure 2, the output shaft (14
), the intermediate shaft (25), and the axle (32) are all oriented leftward and rightward, and an entryway (9) is disposed above the transmission case (13) that houses these shafts.
尚、（３４）は変速部材（１７）の操作軸、（３５）は
シフト回転具（３１）の操作軸である。Note that (34) is the operating shaft of the transmission member (17), and (35) is the operating shaft of the shift rotary tool (31).
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。Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.
図面は本発明に係るトラクタの伝動構造の実施例を示し
、第１図は該構造を示す展開断面図、第２図は伝動装置
の側面図、第３図はローントラクタの側面図である。
（１）・・・・・・エンジン、（７）・・・・・・ベル
ト伝動機構、（９）・・・・・・入カブーリ、（１４）
・・・・・・主軸、（２５）・・・・・・中間軸、（３
２）・・・・・・車軸、（Ａ）・・・・・・伝動装置、
（Ｃ）・・・・・・摩擦式無段変速機構、（Ｄ）・・・
・・・正逆転切換機構、（Ｅ）・・・・・・デフ機構。The drawings show an embodiment of the transmission structure for a tractor according to the present invention, and FIG. 1 is a developed sectional view showing the structure, FIG. 2 is a side view of the transmission, and FIG. 3 is a side view of the lawn tractor. (1)...Engine, (7)...Belt transmission mechanism, (9)...Input cabooly, (14)
...Main shaft, (25) ...Intermediate shaft, (3
2)...Axle, (A)...Transmission device,
(C)...Friction type continuously variable transmission mechanism, (D)...
...Forward/reverse switching mechanism, (E)...Differential mechanism.
Claims (1)
後部に搭載された走行用の伝動装置（Ａ）とを、ベルト
伝動機構（７）によって連動連結してあるトラクタの伝
動構造であって、前記伝動装置（Ａ）を、ベルト伝動機
構（７）によって入力された回転を無段に変速する摩擦
式無段変速機構（Ｃ）、この無段変速機構（Ｃ）の出力
の回転方向を切換え可能な正逆転切換機構（Ｄ）、およ
びデフ機構（Ｅ）から構成するとともに前記摩擦式無段
変速機構（Ｃ）を前記ベルト伝動機構（７）における入
力プーリ（９）の下方に配置し、その摩擦式無段変速機
構（Ｃ）における左右向きの主軸（１４）の後方に前記
デフ機構（Ｅ）における車軸（３２）を配設し、かつ、
これら主軸（１４）と車軸（３２）との間に、前記主軸
（１４）とによって前記正逆転切換機構（Ｄ）を構成す
る中間軸（２５）を前記主軸（１４）と平行に配置して
あるトラクタの伝動構造。A tractor transmission structure in which a vertical shaft type engine (1) mounted on the front part of the machine body and a traveling transmission device (A) mounted on the rear part of the machine body are interlocked and connected by a belt transmission mechanism (7). The transmission device (A) includes a friction type continuously variable transmission mechanism (C) that continuously changes the rotation input by a belt transmission mechanism (7), and an output of the continuously variable transmission mechanism (C). It is composed of a forward/reverse switching mechanism (D) capable of switching the direction of rotation, and a differential mechanism (E), and the friction type continuously variable transmission mechanism (C) is located below the input pulley (9) in the belt transmission mechanism (7). The axle (32) of the differential mechanism (E) is arranged behind the left-right-oriented main shaft (14) of the friction type continuously variable transmission mechanism (C), and
Between the main shaft (14) and the axle (32), an intermediate shaft (25), which together with the main shaft (14) constitutes the forward/reverse switching mechanism (D), is arranged parallel to the main shaft (14). The transmission structure of a certain tractor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2191554A JP2648225B2 (en) | 1990-07-18 | 1990-07-18 | Tractor transmission structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2191554A JP2648225B2 (en) | 1990-07-18 | 1990-07-18 | Tractor transmission structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0475524A true JPH0475524A (en) | 1992-03-10 |
| JP2648225B2 JP2648225B2 (en) | 1997-08-27 |
Family
ID=16276606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2191554A Expired - Lifetime JP2648225B2 (en) | 1990-07-18 | 1990-07-18 | Tractor transmission structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2648225B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60148121U (en) * | 1984-03-14 | 1985-10-01 | 三菱自動車工業株式会社 | Vehicle power transmission device |
| JPS626563U (en) * | 1985-06-26 | 1987-01-16 |
-
1990
- 1990-07-18 JP JP2191554A patent/JP2648225B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60148121U (en) * | 1984-03-14 | 1985-10-01 | 三菱自動車工業株式会社 | Vehicle power transmission device |
| JPS626563U (en) * | 1985-06-26 | 1987-01-16 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2648225B2 (en) | 1997-08-27 |
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