JPH08277903A - Transmission structure for walking type work machine - Google Patents

Abstract

PURPOSE: To constitute a machine body compact while suppressing deterioration in visibility of an operator by providing a gear transmission part in an upper part of a transmission case, providing also an axle transmission part in a lower part of the transmission case, and setting the transmission case to fall ahead so that a reference line passing through the rotational axes of both an output shaft and a drive axle may be close to a rear part of a machine body toward the lower part of the line. CONSTITUTION: A walking type work machine of a two wheel type has a transmission case a composed of both an engine placing frame and a hitch mounting frame which are fastened by bolts thereto integrally. The transmissim case 2 is provided with a gear transmission part A in an upper part, and with an output axis 12, drive axle 11 and an axle transmission part B which performs chain transmission between the both in a lower part. A reference line L which passes through two points such as the rotational axis Q of an output shaft 12 and a rotational axis P of the axle 11 is made so that the lower the point goes on the line comes to the more rear side of the machine body, that is, the transmission case 2 is set so as to fall forward in the attitude. Thereby shape of the transmission case viewed from the left side is made approximately in a dog-leg shape and an air cleaner 45 or the like can be arranged on the upper part of the case 2.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は、テーラー、管理機、バ
インダーといった歩行型作業機に係り、詳しくは、合理
的なレイアウトでもって機体をコンパクトに構成させる
技術に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking type working machine such as a tailor, a management machine and a binder, and more particularly to a technique for compactly constructing a machine body with a rational layout.

【０００２】[0002]

【従来の技術】歩行型作業機では、実開平４‐１１７５
３２号公報の図２に示されたものや、特開平７‐１７２
８６号公報に示されたもののように、後倒れ状のミッシ
ョンケースの前にエンジンを搭載して側面視で略ソ字状
を呈する第１構造のものと、実開平４‐１１７５３２号
公報の図面第１図に示されたものや、実開平４‐１０１
０６４号公報に示されたもののように、前倒れ状のミッ
ションケースの前にエンジンを搭載して側面視で略ハ字
状を呈する第２構造のものとがある。つまり、作業機と
しての使い方や各部の配置レイアウトの違い、或いは作
業装置とのバランス等を考慮して、上記第１及び第２構
造を採択している。2. Description of the Related Art In a walk-behind work machine, an actual flat blade 4-1175 is used.
The one shown in FIG. 2 of Japanese Unexamined Patent Publication No. 32 or JP-A-7-172.
Like the one shown in Japanese Patent Publication No. 86, a structure of a first structure in which an engine is mounted in front of a rearward-falling transmission case and which has a substantially U shape in side view, and a drawing of Japanese Utility Model Laid-Open No. 4-117532 The one shown in Fig. 1 and the actual Kaihei 4-101
As disclosed in Japanese Patent No. 064, there is a second structure in which an engine is mounted in front of a forward-tilting mission case and has a substantially C-shape in a side view. That is, the first and second structures are adopted in consideration of the usage as a working machine, the difference in layout of each part, the balance with the working apparatus, and the like.

【０００３】[0003]

【発明が解決しようとする課題】第１構造では、エンジ
ンと駆動車軸との前後方向間隔が比較的小さくでき、付
設作業装置が小型又は軽量な比較的小型の歩行型作業機
に適し、第２構造ではエンジンと駆動車軸との前後方向
間隔が比較的大きくなり、付設作業装置が大型又は重い
比較的大型の歩行型作業機に適している。In the first structure, the longitudinal distance between the engine and the drive axle can be made relatively small, and the attached work device is suitable for a relatively small walk-type working machine having a small size or a light weight. In the structure, the longitudinal distance between the engine and the drive axle is relatively large, and the attached work device is suitable for a relatively large walk-type work machine that is large or heavy.

【０００４】そこで、第２構造の歩行型作業機を構成す
る場合、キャブレターやエアクリーナー等の補機類の配
置如何によって、操縦のし易さに影響を及ぼすことが考
えられる。すなわち、ミッションケースの前倒れによ
り、該ミッションケース上部とエンジンとが最も前後方
向で接近することになるので、車格上の制約による前後
バランスから、夫々重量物であるミッションケースの上
部とエンジンとを近接配置するような場合では、比較的
軽量な補機類を横側方に張出し配置するか、上方又はエ
ンジン前方に配置することになる。しかしながら、横側
方に配置すると車輪側方部分の、前方配置すると機体前
方の確認が夫々行い難くなるとともに、上方に配置する
と機体バランス上好ましくない、といった具合に補機類
の配置には難しい面があった。Therefore, when constructing the walk-behind work machine of the second structure, it is considered that the maneuverability is affected depending on the arrangement of auxiliaries such as a carburetor and an air cleaner. That is, since the upper part of the mission case and the engine come closest to each other in the front-rear direction due to the forward tilt of the mission case, the upper part of the mission case and the engine, which are heavy objects, respectively, due to the front-rear balance due to vehicle class restrictions. In the case of arranging the two in close proximity to each other, relatively lightweight auxiliaries are arranged laterally laterally, or arranged above or in front of the engine. However, it is difficult to arrange auxiliary equipment such as lateral sideways, it is difficult to check the front side of the fuselage when it is placed forward, and it is unfavorable for the balance of the fuselage when placed frontward. was there.

【０００５】本発明は、歩行型作業機を前述した第２構
造で構成するに当たり、ミッション構造の工夫によって
上記不都合を少なくした状態で補機類を配置した合理的
なレイアウトを実現することを目的とする。It is an object of the present invention to realize a rational layout in which auxiliaries are arranged in a state where the above-mentioned inconvenience is reduced by devising a mission structure when the walk-type working machine is constructed by the above-mentioned second structure. And

【０００６】[0006]

【課題を解決するための手段】上記目的の達成のために
本発明は、上部にエンジン動力の入力軸を、かつ、下端
部に駆動車軸を備えた縦長形状の走行用ミッションケー
スを、機体前部のエンジンと機体後部のヒッチとの間に
配置してある歩行型作業機のミッション構造において、
ミッションケースの上部にギヤ変速部を備え、このギヤ
変速部の出力軸と駆動車軸とを伝動する車軸伝動部をミ
ッションケースの下部に備えるとともに、出力軸と駆動
車軸夫々の回転軸心の２点を通る基準直線を、その下方
ほど機体後方に寄るようにミッションケースを前倒れ姿
勢に設定するとともに、基準直線に対する後側にギヤ変
速部を配置してあることを特徴とする。In order to achieve the above object, the present invention provides a vertically long traveling mission case having an input shaft for engine power at an upper portion and a drive axle at a lower end portion, In the mission structure of the walk-behind work machine, which is arranged between the engine of the rear part and the hitch on the rear of the machine,
A gear transmission is provided on the upper part of the transmission case, an axle transmission for transmitting the output shaft of the gear transmission and the drive axle is provided on the lower part of the transmission case, and two points of rotation axes of the output shaft and the drive axle are provided. It is characterized in that the transmission case is set in a forward leaning posture so that a reference straight line passing through the reference line goes closer to the rear of the machine body, and a gear shift unit is arranged on the rear side with respect to the reference straight line.

【０００７】又、ギヤ変速部を、複数の伝動軸に亘って
形成されるギヤ変速機構と、該ギヤ変速機構を切換操作
する変速操作機構とから構成するとともに、変速操作機
構におけるシフト軸を伝動軸の上方に配設してあると好
都合である。Further, the gear speed change portion is composed of a gear speed change mechanism formed over a plurality of transmission shafts and a speed change operation mechanism for switching the gear speed change mechanism, and the shift shaft in the speed change operation mechanism is transmitted. It is expedient if it is arranged above the axis.

【０００８】[0008]

【作用】請求項１の構成によると、前倒れ姿勢のミッシ
ョンケースにおいてギヤ変速部の出力軸と駆動車軸夫々
の回転軸心の２点を通る基準直線の後側にギヤ変速部を
配置してあるから、ミッションケースの側面視形状が略
く字状になり、ミッションケースとエンジンとを前後に
近接させても、ミッションケース上部とエンジンとの間
に空間を設けることが可能になる。従って、その空間に
補機類を丸ごと、又は食い込ませて配置することがで
き、極力、横側方や上方への張出しを抑制した状態でミ
ッションケース近傍に配置することが可能になった。According to the first aspect of the invention, the gear transmission is arranged behind the reference straight line passing through the two points of the output shaft of the gear transmission and the rotational axis of each of the drive axles in the forward leaning mission case. Therefore, the side view of the mission case has a substantially V shape, and it is possible to provide a space between the upper part of the mission case and the engine even when the mission case and the engine are close to each other in the front-rear direction. Therefore, it is possible to arrange the auxiliary machinery in the space as a whole or in a bite state, and it is possible to arrange the auxiliary machinery in the vicinity of the mission case in a state where the lateral extension or the upward extension is suppressed as much as possible.

【０００９】請求項２の構成では、ギヤ変速機構の伝動
軸上の変速操作機構のシフト軸を配置したので、変速操
作部をミッションケースに一体装備したことで、ミッシ
ョンケース上部とエンジンとの間の空間が狭くなること
がなく、前述した空間確保機能がさらに高められるよう
になる。According to the second aspect of the invention, since the shift shaft of the speed change operation mechanism is arranged on the transmission shaft of the gear speed change mechanism, the transmission case is integrally provided in the transmission case, so that the upper portion of the transmission case and the engine are separated from each other. The space is not narrowed, and the space securing function described above can be further enhanced.

【００１０】[0010]

【発明の効果】請求項１に記載されたミッション構造で
は、ミッションケースの前倒れ構造を採りながら張出し
少なく補機類の配置ができ、操縦者を良好なものとしな
がらコンパクトに機体構成できる合理的な歩行型作業機
を提供できた。請求項２に記載されたミッション構造で
は、上記効果をさらに高められる利点がある。In the mission structure according to the first aspect of the present invention, while adopting the forward leaning structure of the mission case, it is possible to arrange auxiliary machinery with little overhang, which makes it possible to construct a compact body while making the operator good. It was possible to provide a walk-behind work machine. The mission structure described in claim 2 has an advantage that the above effect can be further enhanced.

【００１１】[0011]

【実施例】以下に、本発明の実施例を図面に基づいて説
明する。図１に歩行型作業機である２輪型のテーラーが
示され、１は駆動車輪、２はミッションケース、３は操
縦ハンドル、４はヒッチ、５は作業装置、６は副チェー
ンケースである。エンジンＥが搭載される載置フレーム
７と、ヒッチ４が取付けられた枠フレーム８とは、共に
ミッションケース２にボルト止めされて一体化され、機
体フレームを構成している。エンジンＥからの動力は、
ダブルベルト連動機構９でミッションＭの入力軸１０に
伝わり、駆動車軸１１と作業装置５の双方を駆動するよ
うにしてある。次に、ミッションＭの構造について説明
する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a two-wheeled tailor that is a walk-type working machine, in which 1 is a drive wheel, 2 is a mission case, 3 is a steering wheel, 4 is a hitch, 5 is a working device, and 6 is a sub-chain case. The mounting frame 7 on which the engine E is mounted and the frame frame 8 to which the hitch 4 is attached are both bolted to the mission case 2 and integrated to form a machine body frame. The power from engine E is
The double belt interlocking mechanism 9 is transmitted to the input shaft 10 of the mission M to drive both the drive axle 11 and the working device 5. Next, the structure of the mission M will be described.

【００１２】図２〜図５に示すように、ミッションケー
ス２の上部にギヤ変速部（走行変速部）Ａを備え、この
ギヤ変速部Ａの出力軸１２と駆動車軸１１とをチェーン
伝動する車軸伝動部Ｂを備えている。そして、出力軸１
２の回転軸心Ｑと駆動車軸１１の回転軸心Ｐとの２点を
通る基準直線Ｌが、その下方ほど機体後方に寄るよう
に、ミッションケース２を前倒れ姿勢に設定してあると
ともに、基準直線Ｌに対する後側にギヤ変速部Ａを配置
してある。その結果、ミッションケース２の左側面視形
状は略く字形状を呈しており、エンジンＥとミッション
ケース２上部との間の空間にはエアクリーナ４５等の補
機類が配置されている。As shown in FIGS. 2 to 5, a gear transmission section (traveling transmission section) A is provided on the upper portion of the transmission case 2, and an output shaft 12 and a drive axle 11 of the gear transmission section A are chain-transmitted. The transmission unit B is provided. And the output shaft 1
The mission case 2 is set in the forward leaning posture so that the reference straight line L passing through the two points of the rotation axis Q of 2 and the rotation axis P of the drive axle 11 is closer to the rear of the aircraft as it goes downward. A gear transmission unit A is arranged on the rear side of the reference straight line L. As a result, the left side view of the mission case 2 has a substantially V shape, and auxiliary machines such as the air cleaner 45 are arranged in the space between the engine E and the upper part of the mission case 2.

【００１３】ギヤ変速部Ａは、入力軸１０、第１変速軸
１３、第２変速軸１４、出力軸１２の４軸を備えるとと
もに、第１シフト軸１５、第２シフト軸１６、第３シフ
ト軸１７とを備え、高低２段の副変速機構Ｃ、前進１速
と後進とを切換可能な正逆転変速機構Ｄ、及び前進２速
と前進３速とを切換可能な正転変速機構Ｆとを設けて、
前進６段・後進２段の変速が可能に構成されている。こ
こで、副変速機構Ｃ、正逆転変速機構Ｄ、正転変速機構
Ｆをまとめてギヤ変速機構と称する。The gear transmission unit A includes four shafts, an input shaft 10, a first transmission shaft 13, a second transmission shaft 14, and an output shaft 12, and also has a first shift shaft 15, a second shift shaft 16, and a third shift shaft. An auxiliary speed change mechanism C having two high and low stages, a forward / reverse speed change mechanism D capable of switching between first forward speed and reverse speed, and a normal speed speed change mechanism F capable of switching between second forward speed and third forward speed. With
It is configured to be capable of shifting 6 forward speeds and 2 reverse speeds. Here, the auxiliary transmission mechanism C, the forward / reverse rotation transmission mechanism D, and the forward rotation transmission mechanism F are collectively referred to as a gear transmission mechanism.

【００１４】副変速機構Ｃは、入力軸１０に相対回転自
在に外嵌される伝動回転体１８と、入力軸１０にスプラ
イン外嵌される第１シフトギヤ１９と、伝動回転体１８
の従動ギヤ１８Ａと、第１変速軸１３の受動ギヤ２０と
駆動ギヤ２１を備えて構成されている。第１シフトギヤ
１９を図３中で右にシフトさせて従動ギヤ１８Ａの内歯
部１８ａに咬合させると高速段が現出され、図３中で左
にシフトさせて第１シフトギヤ１９を受動ギヤ２０に咬
合させると低速段が現出される。The sub-transmission mechanism C includes a transmission rotary member 18 fitted on the input shaft 10 so as to be rotatable relative to the input shaft 10, a first shift gear 19 fitted on the input shaft 10 by spline fitting, and a transmission rotary member 18.
The driven gear 18A, the passive gear 20 and the drive gear 21 of the first transmission shaft 13 are provided. When the first shift gear 19 is shifted to the right in FIG. 3 to be engaged with the inner tooth portion 18a of the driven gear 18A, a high speed stage appears, and the first shift gear 19 is shifted to the left in FIG. When occluded, the low speed stage appears.

【００１５】正逆転変速機構Ｄは、伝動回転体１８にス
プライン外嵌される第２シフトギヤ２２と、第１変速軸
１３にベアリング外嵌されるバックギヤ２３と、第２変
速軸１４に遊外嵌される三股ギヤ２４とで構成されてい
る。バックギヤ２３の小径ギヤ部２３ｂと三股ギヤ２４
の大径ギヤ部２４ａとは常時咬合しており、第２シフト
ギヤ２２を図３中で右にシフトさせてその右側ギヤ部分
をバックギヤ２３の大径ギヤ部２３ａに咬合させると後
進状態が現出され、第２シフトギヤ２２を図３中で左に
シフトさせると、第２シフトギヤ２２の左側ギヤ部分が
直接大径ギヤ部２４ａに咬合して前進状態が現出され
る。The forward / reverse speed change mechanism D includes a second shift gear 22 splined to the transmission rotary member 18, a back gear 23 externally fitted to the bearing of the first speed change shaft 13, and a loose external fit to the second speed change shaft 14. And a three-pronged gear 24. The small-diameter gear portion 23b of the back gear 23 and the three-pronged gear 24
3 always meshes with the large-diameter gear part 24a, and when the second shift gear 22 is shifted to the right in FIG. 3 and the right gear part thereof is meshed with the large-diameter gear part 23a of the back gear 23, a reverse drive state appears. When the second shift gear 22 is shifted to the left in FIG. 3, the left gear portion of the second shift gear 22 directly meshes with the large-diameter gear portion 24a, and the forward movement state appears.

【００１６】正転変速機構Ｆは、伝動回転体１８にスプ
ライン外嵌される第３シフトギヤ２５と、第２変速軸１
４の三股ギヤ２４とで構成されている。第３シフトギヤ
２５を図３中で右にシフトしてその大径ギヤ部分を三股
ギヤ２４の小径ギヤ部２４ｃに咬合させると前進３速
（又は６速）が現出され、第３シフトギヤ２５を図３中
で左にシフトしてその小径ギヤ部分を三股ギヤ２４の中
径ギヤ部２４ｂに咬合させると前進２速（又は５速）が
現出されれる。尚、第２変速軸１４端にはブレーキ２６
と左右一対のサイドクラッチ２７，２７が装備されてい
る。The forward rotation speed change mechanism F includes a third shift gear 25 that is spline-fitted to the transmission rotary member 18, and a second speed change shaft 1.
4 fork gear 24. When the third shift gear 25 is shifted to the right in FIG. 3 and its large-diameter gear portion is engaged with the small-diameter gear portion 24c of the three-pronged gear 24, the forward third speed (or sixth speed) appears, and the third shift gear 25 is moved. By shifting to the left in FIG. 3 and engaging the small-diameter gear portion with the medium-diameter gear portion 24b of the three-pronged gear 24, the forward second speed (or fifth speed) appears. A brake 26 is provided at the end of the second speed changing shaft 14.
And a pair of left and right side clutches 27, 27.

【００１７】次に、変速操作構造について説明する。図
３、図５に示すように、第１シフトギヤ１９を操作する
第１シフター２８は第１シフト軸１５に、第２シフトギ
ヤ２２を操作する第２シフター２９は第２シフト軸１６
に、そして第３シフトギヤ２５を操作する第３シフター
３０は第３シフト軸１７に夫々嵌装されている。正逆転
変速機構Ｄと正転変速機構Ｆとは、第２及び第３シフト
軸１６，１７の軸方向への押し引き操作で切換える一般
的な操作構造であるに対し、副変速機構Ｃは第１シフト
軸１５の回動によって切換える構造である。Next, the shift operation structure will be described. As shown in FIGS. 3 and 5, the first shifter 28 for operating the first shift gear 19 is the first shift shaft 15, and the second shifter 29 for operating the second shift gear 22 is the second shift shaft 16.
Further, the third shifter 30 for operating the third shift gear 25 is fitted on the third shift shaft 17, respectively. The forward / reverse speed change mechanism D and the forward / reverse speed change mechanism F have a general operation structure in which they are switched by pushing and pulling the second and third shift shafts 16 and 17 in the axial direction. This is a structure that is switched by the rotation of the 1-shift shaft 15.

【００１８】すなわち、図３に示すように、第１シフタ
ー２８の筒ボス部２８ａに展開状態で略Ｚ型の傾斜溝３
１が軸対象位置に一対形成され、この傾斜溝３１に嵌入
係合するピン３２が第１シフト軸１５に一対植設されて
おり、第１シフト軸１５の回動によって第１シフター２
８をシフト（スライド操作）可能な傾斜カム機構Ｇが構
成されている。That is, as shown in FIG. 3, the inclined groove 3 of substantially Z-shape in the expanded state is formed on the cylindrical boss portion 28a of the first shifter 28.
A pair of pins 1 is formed at the axially symmetric position, and a pair of pins 32 that are fitted into and engaged with the inclined groove 31 are planted in the first shift shaft 15 so that the first shifter 2 can rotate when the first shift shaft 15 rotates.
An inclined cam mechanism G capable of shifting (sliding operation) 8 is configured.

【００１９】図６〜図９に示すように、上記した第１〜
第３シフト軸１５，１６，１７は１本の変速レバー３３
で切換操作できるように構成されている。図２に示すよ
うに、入力軸１０と第１及び第２変速軸１３，１４が３
角配置されるとともに、その上方に３個のシフト軸１
５，１６，１７も互いに接近する状態で三角配置されて
いる。変速レバー３３の操作部３３Ａを、第１シフト軸
１５の後方において左右軸心Ｘで揺動自在な操作体３４
に上下軸心Ｙ回りで揺動自在に支承してあり、結果、変
速レバー３３は十字揺動操作自在にミッションケース２
に支持されている。As shown in FIG. 6 to FIG.
The third shift shafts 15, 16 and 17 include one shift lever 33.
It is configured to be switchable with. As shown in FIG. 2, the input shaft 10 and the first and second transmission shafts 13 and 14 are
It is angularly arranged and three shift shafts 1 are provided above it.
5, 16 and 17 are also arranged in a triangle so as to approach each other. An operation body 34 that can swing the operation portion 33A of the speed change lever 33 behind the first shift shaft 15 about the left-right axis X.
Is rotatably supported around the vertical axis Y, and as a result, the transmission lever 33 can be cross-rotatably operated.
Supported by.

【００２０】操作体３４には、第１シフト軸１５に装着
される従動ギヤ体３５と咬合する駆動ギヤ体３６が一体
形成されており、変速レバー３３の上下揺動操作角度を
増幅して第１シフト軸１５に伝達するギヤ増幅機構Ｈを
構成している。第２シフト軸１６には第２***作体１６
Ａが、第３シフト軸１７には第３***作体１７Ａが夫々
装備され、これらに係合可能な長ピン３７と短ピン３８
とが板状の操作部３３Ａの湾曲部分に取付けてある。こ
こで、第１〜第３シフト軸１５，１６，１７等から構成
される構造をまとめて変速操作機構と称する。The operating body 34 is integrally formed with a drive gear body 36 that meshes with a driven gear body 35 mounted on the first shift shaft 15, and amplifies the vertical swinging operation angle of the speed change lever 33 so as to increase the operating angle. A gear amplifying mechanism H that transmits to the 1-shift shaft 15 is configured. The second operated body 16 is attached to the second shift shaft 16.
A, the third shift shaft 17 is equipped with the third operated body 17A, respectively, and the long pin 37 and the short pin 38 which can be engaged with these.
And are attached to the curved portion of the plate-shaped operation portion 33A. Here, the structure including the first to third shift shafts 15, 16, 17 and the like is collectively referred to as a gear shift operation mechanism.

【００２１】次に、変速レバー３３による変速操作手順
を説明する。先ず、変速レバー３３を下方に揺動して、
レバーガイド３９における低速域Ｌｏに操作すると、ギ
ヤ増幅機構Ｈの作動によって副変速機構Ｃが低速段に切
換わり、さらに下方に揺動すると長ピン３７が第２***
作体１６Ａを選択し（このとき短ピン３８はいずれの被
操作体１６Ａ，１７Ａにも位置していない）、その状態
（図６及び図９の状態）で変速レバー３３を左右方向に
揺動操作すれば後進１速か又は前進１速が得られる。こ
の状態から変速レバー３３を少し上昇揺動すると、長ピ
ン３７が第３***作体１７Ａを選択し（このときも短ピ
ン３８はいずれの***作体１６Ａ，１７Ａにも位置して
いない）、その状態で変速レバー３３を左右方向に揺動
操作すれば前進２速か又は前進３速が得られる。Next, a shift operation procedure by the shift lever 33 will be described. First, swing the speed change lever 33 downward,
When the lever guide 39 is operated in the low speed region Lo, the auxiliary gear mechanism C is switched to the low speed stage by the operation of the gear amplifying mechanism H, and when it is further swung downward, the long pin 37 selects the second operated body 16A (this At this time, the short pin 38 is not positioned on any of the operated bodies 16A and 17A), and in that state (the state of FIGS. 6 and 9), if the gear shift lever 33 is oscillated in the left-right direction, the reverse first speed or First forward speed can be obtained. When the speed change lever 33 is slightly swung up from this state, the long pin 37 selects the third operated body 17A (the short pin 38 is not positioned on any of the operated bodies 16A and 17A at this time), If the speed change lever 33 is oscillated in the left-right direction in this state, the forward second speed or the forward third speed can be obtained.

【００２２】次に変速レバー３３を大きく上昇揺動し
て、中立域Ｎを通り越して高速域Ｈｉに操作すると、ギ
ヤ増幅機構Ｈの作動によって副変速機構Ｃが高速段に切
換わるとともに、短ピン３８が第２***作体１６Ａを選
択し（このとき長ピン３７はいずれの***作体１６Ａ，
１７Ａにも位置していない）、それから変速レバー３３
を左右揺動することで前進４速又は後進２速が得られ
る。そして、変速レバー３３を上限まで揺動すると、短
ピン３８が第３***作体１７Ａを選択し（図７の状態で
あり、このときも長ピン３７はいずれの***作体１６
Ａ，１７Ａにも位置していない）、それから変速レバー
３３を左右揺動することで、前進５速又は６速が得られ
る。Next, when the gear shift lever 33 is largely swung up and moved to pass through the neutral region N and is moved to the high speed region Hi, the auxiliary gear mechanism C is switched to the high speed stage by the operation of the gear amplifying mechanism H and the short pin is operated. 38 selects the second operated body 16A (at this time, the long pin 37 determines which operated body 16A,
17A), and then the shift lever 33
By swinging left and right, the fourth forward speed or the second reverse speed can be obtained. Then, when the speed change lever 33 is swung to the upper limit, the short pin 38 selects the third operated body 17A (the state shown in FIG. 7, and at this time, the long pin 37 selects which operated body 16).
5) or 5th forward speed can be obtained by swinging the speed change lever 33 to the left or right.

【００２３】第２***作体１６Ａの上側と第３***作体
１７Ａの下側の夫々には、短ピン３８の通過は許容する
が、長ピン３７は阻止する突起４０，４０が形成されて
おり、長ピン３７と各突起４０，４０との接当によって
変速レバー３３の上下方向のオバーストロークを規制し
てある。つまり、第２シフター２９と第３シフター３０
とを、変速レバー３３の十字揺動操作によって各別に変
速操作可能に構成するとともに、変速レバー３３をその
十字揺動操作の操作量以上の大きな上下方向への揺動操
作によって傾斜カム機構Ｇを切換操作可能に構成し、か
つ、その大きな揺動操作の両揺動端の夫々において第２
及び第３シフター２９，３０の選択操作を行う十字揺動
操作が可能となるように、変速レバー３３と傾斜カム機
構Ｇと第２及び第３シフター２９，３０とを連係する変
速操作連係機構Ｉが構成されているのである。Protrusions 40, 40 are formed on the upper side of the second operated body 16A and the lower side of the third operated body 17A, respectively, to allow passage of the short pin 38 but prevent the long pin 37. The vertical stroke of the shift lever 33 is restricted by the contact between the long pin 37 and the protrusions 40, 40. That is, the second shifter 29 and the third shifter 30
And the shift lever 33 are configured to be individually shift-changeable by a cross swing operation, and the tilt cam mechanism G is moved by swinging the shift lever 33 in a vertical direction larger than the operation amount of the cross swing operation. The switching operation is possible, and the second swinging operation is performed at both swing ends of the large swinging operation.
And a shift operation linkage mechanism I that links the shift lever 33, the tilt cam mechanism G, and the second and third shifters 29, 30 so that a cross swing operation for selecting the third shifters 29, 30 can be performed. Is configured.

【００２４】図３に示すように、入力軸１０の先端はミ
ッションケース２を貫通して外部に突出させてあり、そ
こにスプラインを形成して動力取出し部（ＰＴＯ軸）４
４に兼用してある。図１に示す副チェーンケース６は、
この動力取出し部４４を利用したものである。又、前述
したように、副変速機構Ｃにおける低速段を現出させる
ための迂回路（受動ギヤ２０と駆動ギヤ２１）支持する
第１変速軸１３が、バックギヤ２３を軸支するバック軸
を兼ねた構造としてあり、その結果、入力軸１０と、第
１及び第２変速軸１３，１４との３軸という少ない伝動
軸数でありながら、前進６段・後進２段の多段変速が可
能に構成されている。As shown in FIG. 3, the tip of the input shaft 10 penetrates the mission case 2 and is projected to the outside, and a spline is formed there to form the power take-out portion (PTO shaft) 4.
It is also used for 4. The sub chain case 6 shown in FIG.
This power take-out unit 44 is used. Further, as described above, the first speed change shaft 13 supporting the bypass (passive gear 20 and drive gear 21) for causing the low speed stage of the auxiliary speed change mechanism C to appear also serves as the back shaft that pivotally supports the back gear 23. As a result, the number of transmission shafts is as small as three, that is, the input shaft 10 and the first and second speed change shafts 13 and 14, and a multi-speed shift of 6 forward speeds and 2 reverse speeds is possible. Has been done.

【００２５】〔別実施例〕３個のシフトギヤが入力軸１
０に嵌装されておれば、例えば、高中低３段の副変速機
構Ｃとして、前進９段・後進３段のミッションとしても
良い。[Other Embodiment] Three shift gears are used for the input shaft 1.
If it is fitted to 0, for example, the auxiliary transmission mechanism C of high, medium, and low 3 speeds may be used as a mission of 9 forward speeds and 3 reverse speeds.

【００２６】尚、特許請求の範囲の項に図面との対照を
便利にするために符号を記すが、該記入により本発明は
添付図面の構成に限定されるものではない。It should be noted that reference numerals are given in 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.

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

【図１】テーラーの側面図Figure 1: Side view of the tailor

【図２】ミッションケース形状を示す側面図FIG. 2 is a side view showing the shape of the mission case.

【図３】走行変速部の構造を示すミッションの断面背面
図FIG. 3 is a cross-sectional rear view of the mission showing the structure of the traveling transmission unit.

【図４】車軸伝動部の構造を示すミッションの断面背面
図FIG. 4 is a cross-sectional rear view of the mission showing the structure of the axle transmission unit.

【図５】変速操作部の構造を示す展開図FIG. 5 is a development view showing the structure of a gear shift operation unit.

【図６】副変速機構の低速状態における変速操作連係機
構を示す側面図FIG. 6 is a side view showing a shift operation linkage mechanism in a low speed state of the auxiliary transmission mechanism.

【図７】副変速機構の高速状態における変速操作連係機
構を示す側面図FIG. 7 is a side view showing a gear shift operation linkage mechanism in a high speed state of the auxiliary gear shift mechanism.

【図８】変速操作部の構造を示す平面図FIG. 8 is a plan view showing the structure of a shift operation unit.

【図９】レバーガイドを示す図FIG. 9 is a diagram showing a lever guide.

【符号の説明】[Explanation of symbols]

２ ミッションケース ４ ヒッチ １０ 入力軸 １１ 駆動車軸 １２ 出力軸 １３ 変速軸 １４ 変速軸 １５ 第１シフト軸 １６ 第２シフト軸 １７ 第３シフト軸 Ａ ギヤ変速部 Ｂ 車軸伝動部 Ｅ エンジン Ｑ 回転軸心 Ｐ 回転軸心 2 mission case 4 hitch 10 input shaft 11 drive axle 12 output shaft 13 shift shaft 14 shift shaft 15 first shift shaft 16 second shift shaft 17 third shift shaft A gear shift unit B axle transmission unit E engine Q rotating shaft center P Axis of rotation

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 上部にエンジン動力の入力軸（１０）
を、かつ、下端部に駆動車軸（１１）を備えた縦長形状
の走行用ミッションケース（２）を、機体前部のエンジ
ン（Ｅ）と機体後部のヒッチ（４）との間に配置してあ
る歩行型作業機のミッション構造であって、 前記ミッションケース（２）の上部にギヤ変速部（Ａ）
を備え、このギヤ変速部（Ａ）の出力軸（１２）と前記
駆動車軸（１１）とを伝動する車軸伝動部（Ｂ）を前記
ミッションケース（２）の下部に備えるとともに、前記
出力軸（１２）と前記駆動車軸（１１）夫々の回転軸心
（Ｑ），（Ｐ）の２点を通る基準直線を、その下方ほど
機体後方に寄るように前記ミッションケース（２）を前
倒れ姿勢に設定するとともに、前記基準直線に対する後
側に前記ギヤ変速部（Ａ）を配置してある歩行型作業機
のミッション構造。1. An engine power input shaft (10) at an upper portion
And a vertically long transmission mission case (2) having a drive axle (11) at the lower end is arranged between the engine (E) at the front of the fuselage and the hitch (4) at the rear of the fuselage. A mission structure for a walk-behind work machine, comprising: a gear transmission (A) at an upper portion of the mission case (2).
And an axle transmission section (B) for transmitting the output shaft (12) of the gear shift section (A) and the drive axle (11) to the lower portion of the transmission case (2) and the output shaft ( 12) and the drive axle (11), the mission case (2) is tilted forward so that the reference straight line passing through the two points of the rotational axes (Q) and (P) of the drive axle (11) is located toward the rear of the fuselage toward the lower side thereof. A mission structure of a walk-type working machine in which the gear transmission (A) is set on the rear side with respect to the reference straight line. 【請求項２】 前記ギヤ変速部（Ａ）を、複数の伝動軸
（１０），（１３），（１４）に亘って形成されるギヤ
変速機構と、該ギヤ変速機構（ｇｈ）を切換操作する変
速操作機構とから構成するとともに、前記変速操作機構
におけるシフト軸（１５），（１６），（１７）を前記
伝動軸（１０），（１３），（１４）の上方に配設して
ある歩行型作業機のミッション構造。2. The gear transmission unit (A), a gear transmission mechanism formed over a plurality of transmission shafts (10), (13), (14), and a switching operation of the gear transmission mechanism (gh). And a shift shaft (15), (16), (17) in the gear shift operation mechanism is disposed above the transmission shafts (10), (13), (14). Mission structure of a walking type work machine.