JP4537967B2

JP4537967B2 - Tractor shifting operation device

Info

Publication number: JP4537967B2
Application number: JP2006059619A
Authority: JP
Inventors: 健吉平川; 克己柳原; 正中村
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2006-03-06
Filing date: 2006-03-06
Publication date: 2010-09-08
Anticipated expiration: 2026-03-06
Also published as: JP2007237788A

Description

本発明は、トラクタの変速操作装置に関する。 The present invention relates to a tractor speed change operation device.

トラクタにおいて、従来、例えば特許文献１に示されるものがあった。
特許文献１に示されるものは、エンジン出力が主変速機構１１、高低変速機構１３、前後進切換え機構１３、副変速機構１５によって変速されて前後輪７，８に伝達されるように走行用変速装置を構成されている。前後進切換え機構１３は、ステアリングハンドル２１の左横側に設けた前後進切換えレバー２２によって切換え操作される。主変速機構１１、高低変速機構１３、副変速機構１５は、運転席２８の左横側に設けた変速レバー３０によって変速操作されるものである。 Conventionally, for example, Patent Document 1 discloses a tractor.
Japanese Patent Application Laid-Open No. 2005-228867 discloses a shift for traveling so that the engine output is shifted by the main transmission mechanism 11, the high / low transmission mechanism 13, the forward / reverse switching mechanism 13, and the auxiliary transmission mechanism 15 and transmitted to the front and rear wheels 7 and 8. Configured device. The forward / reverse switching mechanism 13 is switched by a forward / reverse switching lever 22 provided on the left side of the steering handle 21. The main transmission mechanism 11, the high / low transmission mechanism 13, and the auxiliary transmission mechanism 15 are operated by a transmission lever 30 provided on the left side of the driver's seat 28.

特開２００１−１３０２８１号公報（段落〔００１６〕−〔００３０〕など、図１，３，１５）JP 2001-130281 A (paragraphs [0016]-[0030], etc., FIGS. 1, 3, 15)

トラクタにあっては、たとえば圃場端部で旋回や条合わせを行うなど、車体の前進走行と後進走行を繰り返して行われる場合がある。 In the case of a tractor, the vehicle body may be repeatedly moved forward and backward, for example, turning and adjusting at the end of the field.

従来の技術事項を採用すると、前後進切換えレバーを操作するだけで操作簡単に車体の前進走行と後進走行の切り換えができるものを得ることができた。このものにあっては、前後進切換えをこれ専用の操作レバーによって行い、走行変速をこれ専用の操作レバーによって行うものである。このため、前後進の切換えに併せて変速走行を行う場合、二本の操作レバーを持ち替えて操作する必要があった。 By adopting conventional technical matters, it was possible to obtain a vehicle that can easily switch between forward travel and reverse travel by simply operating the forward / reverse switching lever. In this case, the forward / reverse switching is performed by the dedicated operation lever, and the traveling shift is performed by the dedicated operation lever. For this reason, when performing variable speed travel in conjunction with forward / reverse switching, it has been necessary to change the two operating levers for operation.

本発明の目的は、前後進走行の切換えを操作簡単に行うことができるのみならず、走行変速を併せて行う場合も操作簡単に行うことができるトラクタの変速操作装置を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a tractor speed change operation device that can not only easily switch between forward and backward travel but also can easily perform operation even when traveling speed change is performed.

本第１発明にあっては、トラクタの変速操作装置において、
原動部と運転部との間を仕切る仕切り壁体の上側にステアリングハンドルを配備し、前記ステアリングハンドルを回転自在に支持するハンドル軸の横側方でかつ前記ステアリングハンドルの下方位置に、走行用変速装置を変速操作する変速レバーを設け、前記変速レバーを、前記仕切り壁体の内部における前記ステアリングハンドルの基部の横側方に縦向き姿勢で配備されて前記仕切り壁体の下部から車体後方に延出された連動機構を介して、車体後部に配備された前記走行用変速装置に連係し、前記変速レバーのレバーガイドを、前記仕切り壁体の側面を構成する車体上下向きの縦壁部分に形成して、前記レバーガイドの操作経路を、車体上下方向に並ぶ複数の前後向き経路と、前記複数の前後向き経路の前後中間部を連通する連通経路とで構成し、前記変速レバーを、前記仕切り壁体の内部で前記連動機構の上端部に連係されて前記縦壁部分の外側に延出された車体横向きの横稈身部と、前記横稈身部の外端から車体上向きに延出された縦稈身部と、前記縦稈身部の上端部に設けられた操作部とを備えて構成し、前記複数の前後向き経路のうちの最も車体上方側に位置する上側前後向き経路の車体後方側端部に、前記走行用変速装置が後進状態に変速操作される後進位置を設けるとともに、前記上側前後向き経路の車体前方側端部に、前記走行用変速装置が前記後進状態での減速率に等しい又はそれに近い減速率を現出するシャトル用前進状態に変速操作される前進位置を設け、前記複数の前後向き経路のうちの前記上側前後向き経路よりも車体下方側に位置する下側前後向き経路に、前記走行用変速装置が前記シャトル用前進状態での走行速度値と異なる走行速度値を現出する前進状態に変速操作される前進位置を設け、前記変速レバーを前記上側前後向き経路に操作すると、前記変速レバーの操作部が前記ステアリングハンドルを支持した手で操作可能なステアリングハンドルの近くに位置するように、前記変速レバーを前記仕切り壁体から延出してある。 In the first invention, in the tractor speed change operation device,
A steering handle is provided on the upper side of the partition wall body that partitions the driving portion and the driving portion, and the shift gear for traveling is disposed on the side of the handle shaft that rotatably supports the steering handle and below the steering handle. A shift lever for shifting the device is provided, and the shift lever is arranged in a vertical posture on the lateral side of the base of the steering handle inside the partition wall body and extends from the lower part of the partition wall body to the rear of the vehicle body. through out the interlocking mechanism, in conjunction with the travel gear device deployed in the vehicle body rear portion, the lever guide of the shift lever, formed in the vertical wall portion of the vehicle body vertical direction constituting a side surface of the partition wall to an operation path of the lever guide, and communication path communicating with a plurality of longitudinal oriented path arranged in the vertical direction of the vehicle body, the intermediate portion before and after the plurality of longitudinal orientation path Configured, the shift lever, and the partition wall inside the lateral稈身portion is linked to the upper end portion of the extending out the vehicle sideways to the outside of the vertical wall portion of said interlocking mechanism, the lateral稈身portion a vertical稈身portion which extends to the vehicle body upward from the outer end of said longitudinal稈身unit constitutes an operation section provided at the upper end of the most upper side of the vehicle body of the plurality of longitudinal orientation path the rear of the vehicle body side end portion of the upper front and rear direction path located on the side, Rutotomoni provided reverse position of the traveling speed change device is shifting operation to the reverse state, the vehicular front end portion of the upper front and rear direction path, said The traveling transmission device is provided with a forward movement position that is shifted to the forward movement state for the shuttle that exhibits a deceleration rate that is equal to or close to the deceleration rate in the reverse movement state, and the upper front-rear direction of the plurality of front-rear paths lower front and rear direction is positioned on the vehicle body lower side of the path A road, a forward position of the travel gear device is shift operated to the forward state to emerge the traveling speed value different from the running speed value in the forward drive state for the shuttle is provided, the shift lever to the upper front and rear direction path When operated, the shift lever is extended from the partition wall so that the operation portion of the shift lever is located near the steering handle that can be operated by a hand supporting the steering handle.

本第１発明の構成によると、変速レバーを上側前後向き経路で移動操作する場合、下側前後向き経路で移動操作する場合に比して、変速レバーの操作部がステアリングハンドルの近くに位置している。これにより、ステアリングハンドルに添えた手を変速レバーの操作部にも併せて作用させ、ステアリングハンドルを支持しながら変速レバーを操作することができる。そして、変速レバーを後進位置に操作すれば、走行用変速装置が後進状態になり、車体を後進走行させることができる。変速レバーを前進位置に操作すれば、走行用変速装置がシャトル用前進状態になり、車体を前進走行させることができる。 According to the configuration of the first aspect of the invention, when the shift lever is operated to move along the upper front-rear path, the operation portion of the shift lever is located closer to the steering handle than when the shift lever is operated to move along the lower front- rear path. ing. As a result, the hand attached to the steering handle is also caused to act on the operation portion of the transmission lever, and the transmission lever can be operated while supporting the steering handle. Then, if the shift lever is operated to the reverse position, the travel transmission is in the reverse state, and the vehicle body can travel backward. When the shift lever is operated to the forward position, the travel transmission is in the shuttle forward state, and the vehicle body can travel forward.

変速レバーを上側前後向き経路から下側前後向き経路に移動操作するとともにこの下側前後向き経路に沿わせて車体前後方向に移動すれば、変速レバーがシャトル用前進位置とは異なる前進位置になり、走行用変速装置がシャトル用前進状態とは異なる前進状態になる。すなわち、車体を前後進切換え時の走行速度とは異なる走行速度で前進走行させることができる。 If the shift lever is moved from the upper front-rear path to the lower front- rear path and moved along the lower front- rear path in the vehicle front-rear direction, the shift lever moves to a forward position different from the shuttle forward position. Thus, the traveling transmission is in a forward state different from the shuttle forward state. That is, the vehicle body can be moved forward at a traveling speed different from the traveling speed at the time of forward / reverse switching.

従って、本第１発明によると、ステアリングハンドルに当てた手を変速レバーにも作用させ、ステアリングハンドルを支持しながらでも車体の前後進切換えを行うことができ、旋回や条合わせなどの場合、車体の前後進切換えを操作簡単に行って能率よく作業することができる。しかも、前後進切換えに併せて走行変速を行う場合でも、変速レバーを扱うだけで操作簡単に車体の前進走行速度を変速して楽に作業することができる。 Therefore, according to the first aspect of the invention, the hand applied to the steering handle can also act on the speed change lever, and the vehicle body can be switched between forward and backward movements while supporting the steering handle. It is possible to work efficiently by switching between forward and backward movement. In addition, even when a travel shift is performed in conjunction with forward / reverse switching, the forward travel speed of the vehicle body can be easily shifted and operated easily by simply handling the shift lever.

本第２発明にあっては、本第１発明の構成において、前記下側前後向き経路に、前記走行用変速装置が前記シャトル用前進状態よりも低速の低速前進状態に変速操作される低速前進位置と、前記走行用変速装置が前記シャトル用前進状態よりも高速の高速前進状態に変速操作される高速前進位置とを設けてある。 According to the second aspect of the present invention, in the configuration of the first aspect of the present invention , the traveling speed change device is operated in the lower front-rear direction path so that the speed change operation is performed in a low-speed forward state lower than the shuttle forward state. And a high-speed forward position at which the traveling transmission is shifted to a high-speed forward state that is faster than the forward-travel state for the shuttle.

本第３発明にあっては、本第１又は第２発明の構成において、前記変速レバーが前記下側又は外側前後向き経路から抜け出すように移動付勢する付勢手段を備えてある。According to the third aspect of the invention, in the configuration of the first or second aspect of the invention, there is provided urging means for urging and moving the shift lever so as to come out of the lower or outer front-rear direction path.

本第４発明にあっては、本第３発明の構成において、前記変速レバーを前記上側又は内側前後向き経路に移動付勢するように前記付勢手段を構成してある。
本第４発明の構成によると、変速レバーを下側前後向き経路に位置させる操作が行われなければ、変速レバーが付勢手段による移動付勢によって上側前後向き経路に位置している。このため、変速レバーを下側前後向き経路から上側前後向き経路に移動させる操作を行わずとも車体前後方向に移動操作すれば、変速レバーが上側前後向き経路を移動して後進位置と前進位置に切り換わる。 According to the fourth aspect of the present invention, in the configuration of the third aspect of the present invention, the urging means is configured to urge the shift lever to move upward or inward in the forward / backward direction.
According to the configuration of the fourth aspect of the invention, if the operation of positioning the speed change lever in the lower front- rear direction path is not performed, the speed change lever is positioned in the upper front-rear direction path by the biasing movement by the biasing means. For this reason, if the shifting lever is moved in the vehicle longitudinal direction without performing the operation of moving the shifting lever from the lower longitudinal path to the upper longitudinal path, the shifting lever moves along the upper longitudinal path to the reverse position and the forward position. Switch.

従って、本第４発明によると、変速レバーを下側前後向き経路から上側前後向き経路に移動させる操作を行わずに単に車体前後方向に移動操作するだけで操作簡単に車体の前後進切換えを行うことができる。 Therefore, according to the fourth aspect of the present invention, the forward / backward movement of the vehicle body can be easily switched by simply moving the shift lever in the longitudinal direction of the vehicle body without performing the operation of moving the shift lever from the lower longitudinal direction path to the upper longitudinal direction path. be able to.

本第５発明にあっては、本第４発明の構成において、前記上側前後向き経路の前記前進位置と前記後進位置の間に、前記走行用変速装置を中立状態に維持するように前記変速レバーが位置決め保持される中立位置を設けてある。 According to the fifth aspect of the invention, in the configuration of the fourth aspect of the invention, the speed change lever is configured to maintain the travel transmission device in a neutral state between the forward position and the reverse position of the upper front-rear direction path. Is provided with a neutral position for positioning and holding.

本第５発明の構成によると、変速レバーを上側前後向き経路で移動操作して前進走行と後進走行を切り換えている際、変速レバーを下側前後向き経路に移動操作しなくても、上側前後向き経路の中立位置に操作すれば、変速レバーが中立位置に位置決めされて走行用変速装置が中立状態に維持される。 According to the configuration of the fifth aspect of the invention, when the shift lever is moved and operated on the upper front-rear path to switch between forward travel and reverse travel, the upper and lower front- rear paths can be operated without moving the shift lever to the lower front- rear path. When operated to the neutral position in the direction path, the shift lever is positioned at the neutral position and the traveling transmission is maintained in the neutral state.

従って、本第５発明によると、車体の前後進切換えながら作業している際、操作レバーを上側前後向き経路の中立位置に操作するだけで操作簡単に車体を停止や駐車状態にすることができる。 Therefore, according to the fifth aspect of the present invention, when working while switching the vehicle body forward and backward, the vehicle body can be easily stopped or parked simply by operating the operation lever to the neutral position on the upper front-rear direction path. .

以下、本発明の実施例を図面に基づいて説明する。
図１に示すように、左右一対の操向操作及び駆動自在な前車輪１、左右一対の駆動自在な後車輪２、車体前部に設けたエンジン３が装備された原動部、運転座席４及びこの運転座席４の前方に位置するステアリングハンドル５などが装備された運転部６を備えた自走車を構成し、この自走車の車体フレームの後部を構成するミッションケース７の上部に、左右一対のリフトアーム８をミッションケース７内に位置する油圧シリンダ（図示せず）によって上下に揺動操作されるように構成して設け、前記ミッションケース７の後部に動力取り出し軸９を設けてトラクタを構成してある。 Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a pair of left and right steering operations and driveable front wheels 1, a pair of left and right driveable rear wheels 2, a driving unit equipped with an engine 3 provided at the front of the vehicle body, a driver seat 4, and A self-propelled vehicle including a driving unit 6 equipped with a steering handle 5 and the like located in front of the driver's seat 4 is configured, and the left and right sides of the transmission case 7 constituting the rear part of the body frame of the self-propelled vehicle are A pair of lift arms 8 are provided so as to be swung up and down by a hydraulic cylinder (not shown) located in the mission case 7, and a power take-out shaft 9 is provided at the rear of the mission case 7 to provide a tractor. Is configured.

このトラクタは、車体後部にロータリ耕耘装置を前記左右一対のリフトアーム８によって昇降操作されるように連結するとともに、前記エンジン３の駆動力を前記動力取り出し軸９からロータリ耕耘装置に伝達するように構成して乗用型耕耘機を構成するなど、車体後部に各種の作業装置を昇降操作及び駆動自在に連結して各種の乗用型作業機を構成する。 The tractor connects a rotary tiller to the rear part of the vehicle body so as to be lifted and lowered by the pair of left and right lift arms 8, and transmits the driving force of the engine 3 from the power take-out shaft 9 to the rotary tiller. Various riding devices are constructed by connecting various working devices to the rear part of the vehicle body so as to be lifted and driven freely, such as a riding type tiller.

前記エンジン３の駆動力を前進３段、後進１段の計４段階に変速して前後輪１，２に伝達する走行用変速装置１０（図４参照）を前記ミッションケース７の内部に設けてある。この走行用変速装置１０は、運転部６の前記ステアリングハンドル５の付近に位置する変速レバー２０を備えた変速操作装置Ｓによって変速操作するように構成してある。 Provided inside the transmission case 7 is a transmission 10 for driving (see FIG. 4) for shifting the driving force of the engine 3 to four stages in total of three forward speeds and one reverse speed and transmitting it to the front and rear wheels 1 and 2. is there. The traveling transmission device 10 is configured to perform a speed change operation by a speed change operation device S provided with a speed change lever 20 located in the vicinity of the steering handle 5 of the driving unit 6.

前記変速操作装置Ｓについて詳述すると、図２，５，１０に示すように、この変速操作装置Ｓには、前記ステアリングハンドル５を回転自在に支持するハンドル軸５ａの横一側方に設けた前記変速レバー２０、この変速レバー２０の基端側から延出している規制アーム３１を備えたレバー操作規制機構３０、前記ハンドル軸５ａの横一側方に配置したレバーガイド４０を設けてある。 The shift operation device S will be described in detail. As shown in FIGS. 2, 5, and 10, the shift operation device S is provided on one lateral side of a handle shaft 5 a that rotatably supports the steering handle 5. The shift lever 20, a lever operation restricting mechanism 30 having a restricting arm 31 extending from the base end side of the shift lever 20, and a lever guide 40 disposed on one lateral side of the handle shaft 5a are provided.

図５〜８に示すように、変速レバー２０の基端側に連結杆２１及び連動杆２２を備えた二又部を設けてある。変速レバー２０は、前記二又部が運転部６の居住空間と原動部のエンジンボンネット内空間を仕切る仕切り壁体５０（図１参照）の内部に位置し、変速レバー２０の先端側が前記仕切り壁体５０の外部に突出し、変速レバー２０の操作部２３がステアリングハンドル５の握り部の近くに位置した状態に配置してある。変速レバー２０の前記連結杆２１が車体上下向きの連動筒軸６１の上端部に一体回転自在に設けたレバーステー６２に連結ピン６３を介して回動自在に支持されており、変速レバー２０は、前記連動筒軸６１の軸芯で成る車体上下向きのシフト軸芯Ｘまわりで車体前後方向に揺動操作することができ、かつ、前記連結ピン６３の軸芯で成る選択軸芯Ｙまわりで車体上下方向に揺動操作することができる。 As shown in FIGS. 5 to 8, a bifurcated portion having a connecting rod 21 and an interlocking rod 22 is provided on the base end side of the speed change lever 20. The speed change lever 20 is positioned inside a partition wall body 50 (see FIG. 1) in which the bifurcated portion partitions the living space of the driving portion 6 and the engine bonnet space of the driving portion, and the front end side of the speed change lever 20 is the partition wall. It protrudes to the outside of the body 50 and is arranged in a state where the operation part 23 of the transmission lever 20 is located near the grip part of the steering handle 5. The connecting rod 21 of the speed change lever 20 is rotatably supported via a connection pin 63 on a lever stay 62 provided to be integrally rotatable at the upper end portion of the interlocking cylinder shaft 61 that is vertically oriented in the vehicle body. , It can be swung in the longitudinal direction of the vehicle body about the shift axis X in the vertical direction of the vehicle body, which is the axis of the interlocking cylinder shaft 61, and around the selected axis Y, which is the axis of the connecting pin 63. The vehicle can be swung up and down.

変速レバー２０は、前記連動筒軸６１に内嵌された連動軸７１などを備えた選択連動機構７０、及び、前記連動筒軸６１などを備えたシフト連動機構６０により、図２の如く前記ミッションケース７の上蓋部７ａに回転及び摺動自在に支持された前記走行用変速装置１０の変速操作軸１１に連動されている。 As shown in FIG. 2, the transmission lever 20 includes the selection interlocking mechanism 70 including the interlocking shaft 71 fitted in the interlocking cylinder shaft 61 and the shift interlocking mechanism 60 including the interlocking cylinder shaft 61. The case 7 is linked to the speed change operation shaft 11 of the travel transmission 10 supported on the upper lid portion 7a of the case 7 so as to be rotatable and slidable.

図２〜８に示すように、前記選択連動機構７０は、前記連動筒軸６１に相対回転及び摺動自在に内嵌された前記連動軸７１を備える他、この連動軸７１の下端部に一端側が連結された連動ロッド７２、この連動ロッド７２の他端側に連結された揺動リンク７３、この揺動リンク７３の回転支軸に兼用の車体横向きの連動軸７４、この連動軸７４の端部に一体回転自在に設けた揺動リンク７５、この揺動リンク７５に継ぎ手７６ａを介して前端側が連結された車体前後向きの連動ロッド７６、この連動ロッド７６の後端側が継ぎ手７６ａを介して連結された揺動リンク７７、この揺動リンク７７の回転支軸７７ａの上端部に一体回転自在に設けられた操作アーム７８を備えている。 As shown in FIGS. 2 to 8, the selection interlocking mechanism 70 includes the interlocking shaft 71 fitted in the interlocking cylindrical shaft 61 so as to be relatively rotatable and slidable, and at the lower end portion of the interlocking shaft 71. The interlocking rod 72 connected to the other side, the swinging link 73 connected to the other end of the interlocking rod 72, the interlocking shaft 74 facing the vehicle body that also serves as the rotation support shaft of the swinging link 73, and the end of the interlocking shaft 74 A swing link 75 provided to be rotatable integrally with the body, a front-rear interlocking rod 76 connected to the swing link 75 via a joint 76a, and a rear end side of the interlock rod 76 via a joint 76a. A swing link 77 that is connected, and an operation arm 78 that is rotatably provided integrally with the upper end portion of the rotation support shaft 77a of the swing link 77 are provided.

図６，７，８に示すように、前記連動軸７１の上端部に環状溝７１ａを設けるとともに、この環状溝７１ａには、変速レバー２０の前記連結杆２１及び連動杆２２に固定された操作ピン２４の端部が係入されている。図３に示すように、前記操作アーム７８の先端部７８ａが前記変速操作軸１１の端部に位置する環状溝１１ａに係入されている。 As shown in FIGS. 6, 7, and 8, an annular groove 71 a is provided at the upper end portion of the interlocking shaft 71, and an operation fixed to the connecting rod 21 and the interlocking rod 22 of the speed change lever 20 in the annular groove 71 a. The end of the pin 24 is engaged. As shown in FIG. 3, the tip end portion 78 a of the operation arm 78 is engaged with the annular groove 11 a located at the end portion of the speed change operation shaft 11.

図２〜８に示すように、前記シフト連動機構６０は、前記連動筒軸６１を備える他、この連動筒軸６１の下端部に一体回動自在に設けた揺動リンク６４、この揺動アーム６４に継ぎ手６５ａを介して前端部が連結された車体前後向きの連動ロッド６５、この連動ロッド６５の後端部が継ぎ手６５ａを介して連結された揺動リンク６６、この揺動リンク６６を一体回動自在に支持する筒支軸６６ａの端部に一体回動自在に設けた揺動リンク６７、この揺動リンク６７を前記変速操作軸１１の一端側に一体回動自在に連結された操作アーム１２に連動させている連動ロッド６８を備えている。 As shown in FIGS. 2 to 8, the shift interlock mechanism 60 includes the interlocking cylinder shaft 61, a swing link 64 provided at the lower end of the interlocking cylinder shaft 61 so as to be integrally rotatable, and the swing arm. 64, a front-rear-facing interlocking rod 65 connected to the front end of the interlocking rod 65 via a joint 65a, a swing link 66 whose rear end is connected via a joint 65a, and the swinging link 66. An oscillating link 67 provided at the end of a cylindrical support shaft 66a that is rotatably supported, and an operation in which the oscillating link 67 is connected to one end of the speed change operation shaft 11 so as to be integrally rotatable. An interlocking rod 68 that is interlocked with the arm 12 is provided.

図５〜８に示すように、前記連動筒軸６１は、この連動筒軸６１の上端部を筒部５１ａを介して回転自在に支持するように構成してハンドルポスト５２に連結された上ステー５１、連動筒軸６１の下端部を筒部５３ａを介して回転自在に支持するように構成して車体部分に連結された下ステー５３によって支持されている。図２，３に示すように、シフト連動機構６０の前記揺動リンク７７及び操作アーム７８は、揺動リンク７７と操作アーム７８の前記回転支軸７７ａを筒体５４を介して回転自在に支持するように構成してミッションケース７に連結されたステー５５によって支持されている。 As shown in FIGS. 5 to 8, the interlocking cylinder shaft 61 is configured such that the upper end of the interlocking cylinder shaft 61 is rotatably supported via the cylinder portion 51 a and is connected to the handle post 52. 51. The lower end portion of the interlocking cylinder shaft 61 is supported by a lower stay 53 connected to the vehicle body portion so as to be rotatably supported via a cylinder portion 53a. As shown in FIGS. 2 and 3, the swing link 77 and the operation arm 78 of the shift interlocking mechanism 60 support the swing support shaft 77 a of the swing link 77 and the operation arm 78 through a cylindrical body 54 so as to be freely rotatable. It is configured to be supported by a stay 55 connected to the mission case 7.

図５〜８に示すように、変速レバー２０の連結杆２１及び連動杆２２に設けた長孔形のピン孔２５を摺動自在に挿通した状態で前記レバーステー６２に支持させたばね掛けピン５６と、前記各操作ピン２４とにわたってスプリング５７を連結してある。各スプリング５７は、変速レバー２０をレバーステー６２の方に引き寄せ付勢し、変速レバー２０が連結ピン６３を介してレバーステー６２に回動自在に連結している部位で変速レバー２０のガタ付きが発生することを抑制している。 As shown in FIGS. 5 to 8, a spring hook pin 56 supported by the lever stay 62 in a state in which a long hole-shaped pin hole 25 provided in the connecting rod 21 and the interlocking rod 22 of the speed change lever 20 is slidably inserted. And a spring 57 is connected to each operation pin 24. Each spring 57 pulls and urges the transmission lever 20 toward the lever stay 62, and the transmission lever 20 is rattled at a portion where the transmission lever 20 is rotatably connected to the lever stay 62 via the connection pin 63. Is suppressed from occurring.

すなわち、選択連動機構７０は、変速レバー２０が選択軸芯Ｙまわりで車体上下方向に揺動操作されると、変速レバー２０の前記操作ピン２４によって連動軸７１を連動筒軸６１に沿わせて車体上下方向に移動操作させ、この動力を連動ロッド７２、揺動リンク７３、連動軸７４、揺動リンク７５、連動ロッド７６、揺動リンク７７を介して回転支軸７７ａに伝達して操作アーム７８を揺動させ、この操作アーム７８によって変速操作軸１１を車体横方向に摺動操作する。 That is, the selection interlocking mechanism 70 moves the interlocking shaft 71 along the interlocking cylinder shaft 61 by the operation pin 24 of the shifting lever 20 when the shift lever 20 is swung up and down around the selection axis Y. The vehicle body is moved up and down, and this power is transmitted to the rotation support shaft 77a via the interlocking rod 72, the swinging link 73, the interlocking shaft 74, the swinging link 75, the interlocking rod 76, and the swinging link 77 to operate the arm. 78 is swung, and the speed change operation shaft 11 is slid in the lateral direction of the vehicle body by the operation arm 78.

そして、シフト連動機構６０は、変速レバー２０がシフト軸芯Ｘまわりで車体前後方向に揺動操作されると、変速レバー２０と共に揺動するレバーステー６２によって連動筒軸６１を回動操作させ、この動力を揺動リンク６４、連動ロッド６５、揺動リンク６６，６７を介して連動ロッド６８に伝達し、操作アーム１２を揺動させて変速操作軸１１を回転操作する。 The shift interlock mechanism 60 rotates the interlocking cylinder shaft 61 by a lever stay 62 that swings together with the speed change lever 20 when the speed change lever 20 is swung in the longitudinal direction of the vehicle body around the shift axis X. This power is transmitted to the interlocking rod 68 via the swing link 64, the interlocking rod 65, and the swinging links 66 and 67, and the operation arm 12 is swung to rotate the speed change operation shaft 11.

図４に示すように、前記走行用変速装置１０には、前記変速操作軸１１のミッションケース内部分に一体摺動及び一体回動自在に設けたシフトアーム１３、ミッションケース内に位置する一対の車体前後向き支軸１４，１４に摺動自在に支持されたシフタ１５、前記一対のシフタ１５，１５の一方によって摺動操作されるシフトギヤ１６、前記一対のシフタ１５，１５の他方によって摺動操作されるシフトギヤ１７を備えてある。 As shown in FIG. 4, the traveling transmission device 10 includes a shift arm 13 that is integrally slidable and integrally rotatable in a transmission case inner portion of the transmission operation shaft 11, and a pair of gears positioned in the transmission case. A shifter 15 slidably supported on the longitudinal support shafts 14, 14, a shift gear 16 that is slid by one of the pair of shifters 15, 15, and a sliding operation by the other of the pair of shifters 15, 15 The shift gear 17 is provided.

すなわち、走行用変速装置１０は、変速操作軸１１が車体横方向に摺動操作されることにより、この変速操作軸１１の前記シフトアーム１３が一方のシフタ１５の操作凹部１５ａと他方のシフタ１５の操作凹部１５ａに択一的に係入され、一対のシフトギヤ１６，１７から摺動操作するべきシフトギヤ１６，１７が選択される。変速操作軸１１が左右の摺動スロトークエンドで回転操作されることにより、シフトアーム１３がシフタ１５を摺動操作し、選択したシフトギヤ１６，１７が所定の一対のギヤに係脱操作される。これにより、前進第１速〜第３速の３段階の前進駆動状態と、後進１段の後進駆動状態とに変速される。 That is, in the traveling transmission device 10, the shift operation shaft 11 is slid in the lateral direction of the vehicle body, so that the shift arm 13 of the shift operation shaft 11 is operated by the operation recess 15 a of one shifter 15 and the other shifter 15. The shift gears 16, 17 to be slidably operated are selected from the pair of shift gears 16, 17. When the speed change operation shaft 11 is rotated at the left and right sliding slots, the shift arm 13 slides the shifter 15 and the selected shift gears 16 and 17 are engaged and disengaged with a predetermined pair of gears. . As a result, the speed is changed between the three-stage forward drive state of the first forward speed to the third speed and the reverse drive state of the first reverse stage.

この走行用変速装置１０は、さらに次の如く構成してある。
すなわち、前進第２速の前進駆動状態に変速されると、自走車体を前進発進させることが可能なように、かつ、後進駆動状態に変速された場合の走行速度値と等しい又はそれに近い走行速度値で自走車体を前進走行させることが可能なように、後進駆動状態に変速された場合に現出する減速率と等しい又はそれに近い減速率を現出して伝動する。前進第１速の前進駆動状態に変速されると、前進第２速の前進駆動状態に変速された場合の走行速度値よりも低速の走行速度値で自走車体を前進走行させることが可能なように、前進第２速の前進駆動状態に変速された場合の減速率よりも高い減速率を現出して伝動する。前進第３速の前進駆動状態に変速されると、前進第２速の前進駆動状態に変速された場合の走行速度値よりも高速の走行速度値で自走車体を前進走行させることが可能なように、前進第２速の前進駆動状態に変速された場合の減速率よりも低い減速率を現出して伝動する。 The traveling transmission 10 is further configured as follows.
That is, when the speed is changed to the forward drive state of the second forward speed, the self-propelled vehicle body can be moved forward and travel is equal to or close to the travel speed value when the speed is changed to the reverse drive state. In order to allow the self-propelled vehicle body to travel forward at the speed value, a deceleration rate that is equal to or close to the deceleration rate that appears when the gear is shifted to the reverse drive state is transmitted and transmitted. When shifting to the forward drive state of the first forward speed, the self-propelled vehicle body can travel forward at a travel speed value lower than the travel speed value when shifted to the forward drive state of the second forward speed. As described above, a speed reduction rate higher than the speed reduction rate in the case of shifting to the forward drive state of the second forward speed appears and is transmitted. When the speed is shifted to the forward drive state of the third forward speed, the self-running vehicle body can travel forward at a travel speed value higher than the travel speed value when the speed is shifted to the forward drive state of the second forward speed. As described above, a speed reduction rate lower than the speed reduction rate in the case of shifting to the forward drive state of the second forward speed appears and is transmitted.

図１０に示すように、前記レバーガイド４０は、前記仕切り壁体５０の車体上下向きの縦壁部分に一体形成してある。図９（ロ）に示すように、このレバーガイド４０は、変速レバー２０の前記二又部と車体上下向きの縦稈身部の間に位置する車体横向きの横稈身部２６が車体前後方向に操作される二つの前後向き経路４１，４２を車体上下方向に並べて形成している。二つの前後向き経路４１，４２は、各前後向き経路４１，４２の中間部で変速レバー２０が二つの前後向き経路４１，４２の一方から他方に移動操作されるように各前後向き経路４１，４２の両端部間の大部分で連通し合った状態に形成してある。 As shown in FIG. 10, the lever guide 40 is formed integrally with a vertical wall portion of the partition wall body 50 facing the vehicle body. As shown in FIG. 9 (b), the lever guide 40 has a vehicle body laterally extending side portion 26 positioned between the bifurcated portion of the speed change lever 20 and the vehicle body vertically extending vertical body portion. Two front-and-rear direction paths 41 and 42 operated in the above are formed side by side in the vertical direction of the vehicle body. The two front-rear paths 41, 42 are arranged in the middle of the front-rear paths 41, 42 so that the shift lever 20 is moved from one of the two front-rear paths 41, 42 to the other. 42 is formed so as to communicate with most of both end portions.

前記二つの前後向き経路４１，４２のうちの車体上方側に位置する上側前後向き経路４１の車体後方側端部に後進位置Ｒを設け、前記上側前後向き経路４１の車体前方側端部に前進２速位置Ｆ２を設けてある。前記二つの前後向き経路４１，４２のうちの車体下方側に位置する下側前後向き経路４２の車体後方側端部に前進１速位置Ｆ１を設け、前記下側前後向き経路４２の車体前方側端部に前進３速位置Ｆ３を設けてある。各前後向き経路４１，４２の中間部に中立位置Ｎを設けてある。前記上側前後向き経路４１の中立位置Ｎに連通した切り欠き４３をレバーガイド４０に設けてある。この切り欠き４３は、変速レバー２０の前記横稈身部２６が係入されることにより、変速レバー２０を中立位置Ｎに係止させて位置決めする。 A reverse position R is provided at the vehicle body rear side end portion of the upper front-rear direction path 41 located on the vehicle body upper side of the two front-rear direction paths 41, 42, and the vehicle moves forward to the vehicle body front side end portion of the upper front-rear direction path 41. A second speed position F2 is provided. A forward first speed position F1 is provided at the vehicle body rear side end portion of the lower front-rear direction path 42 located on the lower side of the vehicle body of the two front-rear direction paths 41, 42, and the vehicle front side of the lower front-rear direction path 42 A forward third speed position F3 is provided at the end. A neutral position N is provided in the middle of each of the front-rear paths 41 and 42. A notch 43 communicating with the neutral position N of the upper front-rear path 41 is provided in the lever guide 40. The notch 43 is positioned by locking the shift lever 20 at the neutral position N by engaging the lateral slimming portion 26 of the shift lever 20.

レバーガイド４０の前記各前後向き経路４１，４２よりもやや前方側や後方側に位置する前端部や後端部に、変速レバー２０の操作位置を示す記号を備えた表示面４４を設けてある。図１０に示すように、前端側の表示面４４も、後端側の表示面４４も、運転部６から見やすいように斜め後方上方に向いた傾斜面にしてある。 A display surface 44 having a symbol indicating an operation position of the speed change lever 20 is provided at a front end portion or a rear end portion located slightly forward or rearward from the front-rear paths 41 and 42 of the lever guide 40. . As shown in FIG. 10, the display surface 44 on the front end side and the display surface 44 on the rear end side are inclined surfaces that face obliquely rearward and upward so that they can be easily seen from the operation unit 6.

図５，６，７に示すように、変速レバー２０の二又部と前記上ステー５１と間に、付勢手段の一例としてのスプリング５８を設けてある。このスプリング５８は、変速レバー２０を上昇揺動付勢することにより、変速レバー２０の前記横稈身部２６を前記下側前後向き経路４２から前記上側前後向き経路４１に移動付勢している。 As shown in FIGS. 5, 6, and 7, a spring 58 as an example of an urging means is provided between the bifurcated portion of the speed change lever 20 and the upper stay 51. The spring 58 urges the shift lever 20 to move upward and swing, thereby urging the lateral slimming portion 26 of the shift lever 20 from the lower front-rear direction path 42 to the upper front-rear direction path 41. .

図５〜８に示すように、前記レバー操作規制機構３０は、変速レバー２０の二又部から車体前方向きに延出された前記規制アーム３１を備える他、前記上ステー５１に固定されたストッパ板３２を備えている。ストッパ板３２に、規制アーム３１の先端側が移動する上下一対の変速規制経路３３，３４、一つの選択規制経路３５、上側の変速規制経路３３に連通した切り欠き３６を設けてある。変速レバー２０が選択軸芯Ｙまわりで車体上下方向に揺動操作され、変速レバー２０の横稈身部２６がレバーガイド４０の二つの前後向き経路４１，４２の一方から他方に移動される際、規制アーム３１が選択規制経路３５を移動する。変速レバー２０がシフト軸芯Ｘまわりで車体前後方向に操作され、変速レバー２０の横稈身部２６がレバーガイド４０の上側前後向き経路４１に沿わせて揺動操作される際、規制アーム３１が上側の変速規制経路３３を移動する。変速レバー２０がシフト軸芯Ｘまわりで車体前後方向に操作され、変速レバー２０の横稈身部２６がレバーガイド４０の下側前後向き経路４２に沿わせて揺動操作される際、規制アーム３１が下側の変速規制経路３４を移動する。 As shown in FIGS. 5 to 8, the lever operation restricting mechanism 30 includes the restricting arm 31 extending from the bifurcated portion of the speed change lever 20 toward the front of the vehicle body, and a stopper fixed to the upper stay 51. A plate 32 is provided. The stopper plate 32 is provided with a pair of upper and lower shift restriction paths 33, 34 on which the tip end side of the restriction arm 31 moves, one selection restriction path 35, and a notch 36 communicating with the upper shift restriction path 33. When the speed change lever 20 is swung in the vertical direction of the vehicle body around the selected axis Y, and the lateral slimming portion 26 of the speed change lever 20 is moved from one of the two front-to-back paths 41 and 42 of the lever guide 40 to the other. The restriction arm 31 moves along the selection restriction path 35. When the shift lever 20 is operated in the longitudinal direction of the vehicle body around the shift axis X and the lateral slimming portion 26 of the shift lever 20 is swung along the upper front-rear direction path 41 of the lever guide 40, the restriction arm 31 is operated. Moves on the upper shift restriction path 33. When the speed change lever 20 is operated in the longitudinal direction of the vehicle body around the shift axis X, and the lateral slimming portion 26 of the speed change lever 20 is swung along the lower front-back direction path 42 of the lever guide 40, the restriction arm 31 moves on the lower shift restriction path 34.

すなわち、変速レバー２０がレバーガイド４０の切り欠き４３に係入されると、規制アーム３１が切り欠き３６に入り込んでストッパ板３２に当接してストッパ板３２が規制アーム３１にストップ作用する。これにより、レバー操作規制機構３０は、変速レバー２０がそれ以上に上昇揺動操作されないように変速レバー２０の揺動を規制する。変速レバー２０が後進位置Ｒに操作されると、規制アーム３１が上側の変速規制経路３３の一端側でストッパ板５１に当接してストッパ板３２が規制アーム３１にストップ作用する。これにより、レバー操作規制機構３０は、変速レバー２０がそれ以上後方側に揺動操作されないように変速レバー２０の揺動を規制する。変速レバー２０が前進２速位置Ｆ２に操作されると、規制アーム３１が上側の変速規制経路３３の他端側でストッパ板３２に当接してストッパ板３２が規制アーム３１にストップ作用する。これにより、レバー操作規制機構３０は、変速レバー２０がそれ以上前方側に揺動操作されないように変速レバー２０の揺動を規制する。変速レバー２０が前進１速位置Ｆ１に操作されると、規制アーム３１が下側の変速規制経路３４の一端側でストッパ板３２に当接してストッパ板３２が規制アーム３１にストップ作用する。これにより、レバー操作規制機構３０は、変速レバー２０がそれ以上後方側に揺動操作されないように変速レバー２０の揺動を規制する。変速レバー２０が前進３速位置Ｆ３に操作されると、規制アーム３１が下側の変速規制経路３４の他端側でストッパ板３２に当接してストッパ板３２が規制アーム３１にストップ作用する。これにより、レバー操作規制機構３０は、変速レバー２０がそれ以上前方側に揺動操作されないように変速レバー２０の揺動を規制する。 That is, when the transmission lever 20 is engaged with the notch 43 of the lever guide 40, the restriction arm 31 enters the notch 36 and comes into contact with the stopper plate 32, so that the stopper plate 32 stops the restriction arm 31. Accordingly, the lever operation restriction mechanism 30 restricts the swinging of the speed change lever 20 so that the speed change lever 20 is not further lifted and swung. When the transmission lever 20 is operated to the reverse position R, the restriction arm 31 comes into contact with the stopper plate 51 on one end side of the upper transmission restriction path 33 and the stopper plate 32 stops the restriction arm 31. Thereby, the lever operation restricting mechanism 30 restricts the swing of the speed change lever 20 so that the speed change lever 20 is not further swung back. When the speed change lever 20 is operated to the second forward speed position F2, the restriction arm 31 comes into contact with the stopper plate 32 on the other end side of the upper speed change restriction path 33, and the stopper plate 32 stops the restriction arm 31. Thereby, the lever operation restricting mechanism 30 restricts the swing of the shift lever 20 so that the shift lever 20 is not further swung forward. When the shift lever 20 is operated to the first forward speed position F1, the restriction arm 31 comes into contact with the stopper plate 32 on one end side of the lower shift restriction path 34, and the stopper plate 32 stops the restriction arm 31. Thereby, the lever operation restricting mechanism 30 restricts the swing of the speed change lever 20 so that the speed change lever 20 is not further swung back. When the speed change lever 20 is operated to the forward third speed position F3, the restriction arm 31 comes into contact with the stopper plate 32 on the other end side of the lower speed change restriction path 34 and the stopper plate 32 stops the restriction arm 31. Thereby, the lever operation restricting mechanism 30 restricts the swing of the shift lever 20 so that the shift lever 20 is not further swung forward.

つまり、自走車体を走行させるに当たり、変速レバー２０を選択軸芯Ｙまわりで下降側に揺動操作して横稈身部２６をレバーガイド４０の下側前後向き経路４２に操作し、さらに、変速レバー２０をシフト軸芯Ｘまわりで下側前後向き経路４２に沿わせて車体後方側に揺動操作して前進１速位置Ｆ１に操作する。すると、選択連動機構７０による変速レバー２０と変速操作軸１１の連動のため、変速操作軸１１が車体横方向での一方に摺動操作されてシフトアーム１３を一方のシフタ１５の操作凹部１５ａに係入させ、２個のシフトギヤ１６，１７から一方のシフトギヤを選択する。さらに、シフト連動機構６０による変速レバー２０と変速操作軸１１の連動のため、変速操作軸１１が回転操作されてシフトアーム１３によってシフタ１５を摺動操作し、選択しているシフトギヤを変速レバー２０の操作位置Ｆ１に対応したギヤ（図示せず）に噛み合い操作する。これにより、走行用変速装置１０が前進第１速の前進駆動状態になり、自走車体が第１速で前進走行する。 That is, when traveling the self-propelled vehicle body, the shift lever 20 is swung downward about the selected axis Y to operate the lateral slimming portion 26 to the lower front-rear direction path 42 of the lever guide 40, and The speed change lever 20 is swung to the rear side of the vehicle body along the lower front-back direction path 42 around the shift axis X to operate to the forward first speed position F1. Then, since the shift lever 20 and the shift operation shaft 11 are linked by the selection interlock mechanism 70, the shift operation shaft 11 is slid to one side in the vehicle body lateral direction, and the shift arm 13 is moved to the operation recess 15a of one shifter 15. One shift gear is selected from the two shift gears 16 and 17. Further, because the shift lever 20 and the shift operation shaft 11 are linked by the shift interlock mechanism 60, the shift operation shaft 11 is rotated, the shift arm 13 is slid and the shifter 15 is slid, and the selected shift gear is moved to the shift lever 20. Is engaged with a gear (not shown) corresponding to the operation position F1. As a result, the transmission 10 for traveling enters the forward drive state of the first forward speed, and the self-propelled vehicle body travels forward at the first speed.

変速レバー２０を選択軸芯Ｙまわりで上昇側に揺動操作して横稈身部２６をレバーガイド４０の上側前後向き経路４１に操作し、さらに変速レバー２０シフト軸芯Ｘまわりで上側前後向き経路４１に沿わせて車体前方側に揺動操作して前進２速位置Ｆ２に操作する。すると、選択連動機構７０による変速レバー２０と変速操作軸１１の連動のため、変速操作軸１１が車体横方向での他方に摺動操作され、シフトアーム１３を他方のシフタ１５の操作凹部１５ａに係合させて２個のシフトギヤ１６，１７から他方のシフトギヤを選択する。さらに、シフト連動機構６０による変速レバー２０と変速操作軸１１の連動のため、変速操作軸１１が回転操作されてシフトアーム１３によってシフタ１５を摺動操作し、選択しているシフトギヤを変速レバー２０の操作位置Ｆ２に対応したギヤ（図示せず）に噛み合い操作する。これにより、走行用変速装置１０が前進第２速の前進駆動状態になり、自走車体が第２速で前進走行する。 The shift lever 20 is swung upward about the selected axis Y to operate the lateral slimming portion 26 in the upper front-rear direction path 41 of the lever guide 40, and further to the upper front-rear direction about the shift lever 20 shift axis X. A swing operation is performed along the path 41 toward the front side of the vehicle body to operate the forward second speed position F2. Then, since the speed change lever 20 and the speed change operation shaft 11 are interlocked by the selection interlock mechanism 70, the speed change operation shaft 11 is slid to the other side in the vehicle body direction, and the shift arm 13 is moved to the operation recess 15a of the other shifter 15. The other shift gear is selected from the two shift gears 16 and 17 by engaging. Further, because the shift lever 20 and the shift operation shaft 11 are linked by the shift interlock mechanism 60, the shift operation shaft 11 is rotated, the shift arm 13 is slid and the shifter 15 is slid, and the selected shift gear is moved to the shift lever 20. Is engaged with a gear (not shown) corresponding to the operation position F2. As a result, the traveling transmission 10 enters the forward second speed forward drive state, and the self-propelled vehicle travels forward at the second speed.

変速レバー２０を選択軸芯Ｙまわりで下降側に揺動操作して横稈身部２６をレバーガイド４０の下側前後向き経路４２に操作し、さらに、変速レバー２０をシフト軸芯Ｘまわりで下側前後向き経路４２に沿わせて車体前方側に揺動操作して前進３速位置Ｆ３に操作する。すると、選択連動機構７０による変速レバー２０と変速操作軸１１の連動のため、変速操作軸１１が車体横方向での一方に摺動操作され、シフトアーム１３を一方のシフタ１５の操作凹部１５ａに係入させて２個のシフトギヤ１６，１７から一方のシフトギヤを選択する。さらに、シフト連動機構６０による変速レバー２０と変速操作軸１１の連動のため、変速操作軸１１が回転操作されてシフトアーム１３によってシフタ１５を摺動操作し、選択しているシフトギヤを変速レバー２０の操作位置Ｆ３に対応したギヤ（図示せず）に噛み合い操作する。これにより、走行用変速装置１０が前進第３速の前進駆動状態になり、自走車体が第３速で前進走行する。 The shift lever 20 is swung downward about the selected axis Y to operate the lateral slimming portion 26 to the lower front-rear path 42 of the lever guide 40, and the shift lever 20 is moved about the shift axis X. Swinging is performed forward of the vehicle body along the lower front-rear direction path 42 to operate the forward third speed position F3. Then, because the shift lever 20 and the shift operation shaft 11 are linked by the selection interlocking mechanism 70, the shift operation shaft 11 is slid to one side in the lateral direction of the vehicle body, and the shift arm 13 is moved to the operation recess 15a of one shifter 15. One shift gear is selected from the two shift gears 16 and 17 by engaging. Further, because the shift lever 20 and the shift operation shaft 11 are linked by the shift interlock mechanism 60, the shift operation shaft 11 is rotated, the shift arm 13 is slid and the shifter 15 is slid, and the selected shift gear is moved to the shift lever 20. Is engaged with a gear (not shown) corresponding to the operation position F3. As a result, the traveling transmission device 10 enters the forward third speed forward drive state, and the self-propelled vehicle travels forward at the third speed.

変速レバー２０を選択軸芯Ｙまわりで上昇側に揺動操作して横稈身部２６をレバーガイド４０の上側前後向き経路４１に操作し、さらに変速レバー２０をシフト軸芯Ｘまわりで上側前後向き経路４１に沿わせて車体後方側に揺動操作して後進位置Ｒに操作する。すると、選択連動機構７０による変速レバー２０と変速操作軸１１の連動のため、変速操作軸１１が車体横方向に摺動操作されてシフトアーム１３を一方のシフタ１５の操作凹部１５ａに係入させ、２個のシフトギヤ１６，１７から一方のシフトギヤを選択する。さらに、シフト連動機構６０による変速レバー２０と変速操作軸１１の連動のため、変速操作軸１１が回転操作されてシフトアーム１３によってシフタ１５を摺動操作し、選択していたシフトギヤを変速レバー２０の操作位置Ｒに対応したギヤ（図示せず）に噛み合い操作する。これにより、走行用変速装置１０が後進駆動状態になり、自走車体が後進走行する。 The shift lever 20 is swung upward about the selected axis Y to operate the lateral slimming portion 26 on the upper front-rear direction path 41 of the lever guide 40, and the shift lever 20 is further moved back and forth around the shift axis X. A swinging operation is performed on the rear side of the vehicle body along the direction path 41 to operate the reverse position R. Then, since the speed change lever 20 and the speed change operation shaft 11 are linked by the selection interlock mechanism 70, the speed change operation shaft 11 is slid in the lateral direction of the vehicle body, and the shift arm 13 is engaged with the operation recess 15a of one shifter 15. One shift gear is selected from the two shift gears 16 and 17. Further, since the shift lever 20 and the shift operation shaft 11 are linked by the shift interlock mechanism 60, the shift operation shaft 11 is rotated, the shift arm 13 is slid and the shifter 15 is slid, and the selected shift gear is moved to the shift lever 20. Is engaged with a gear (not shown) corresponding to the operation position R. As a result, the traveling transmission device 10 enters the reverse drive state, and the self-propelled vehicle travels backward.

自走車体を停車や駐車させる際、変速レバー２０を上側前後向き経路４１や下側前後向き経路４２の中立位置Ｎに操作する。すると、前記スプリング５８による変速レバー２０の移動付勢のために変速レバー２０の横稈身部２６が切り欠き４３に自ずと係入し、変速レバー２０が中立位置Ｎに位置決めされる。これにより、走行用変速装置１０が中立状態に維持され、前後輪１，２が停止状態に維持される。 When the self-propelled vehicle is stopped or parked, the shift lever 20 is operated to the neutral position N of the upper front-rear direction path 41 or the lower front-rear direction path 42. Then, the lateral slimming portion 26 of the transmission lever 20 naturally engages with the notch 43 due to the movement bias of the transmission lever 20 by the spring 58, and the transmission lever 20 is positioned at the neutral position N. As a result, the traveling transmission 10 is maintained in a neutral state, and the front and rear wheels 1 and 2 are maintained in a stopped state.

自走車体の前進走行と後進走行を繰り返す際、変速レバー２０をシフト軸芯Ｘまわりで上側前後向き経路４１に沿わせて車体前後方向に揺動操作し、前進２速位置Ｆ２と後進位置Ｒとに切換え操作する。
変速レバー２０を前進２速位置Ｆ２に操作すると、走行用変速装置１０が前進第２速のシャトル用前進状態になり、エンジン３からの駆動力を、後進駆動状態に変速された場合に現出する減速率と等しい又はそれに近い減速率で前進駆動力に変速して前後輪１，２に伝動し、自走車体を前進発進させることができる。そして、自走車体が後進走行の走行速度値と等しい又はそれに近い走行速度値で前進走行する。 When the self-propelled vehicle body repeats forward travel and reverse travel, the shift lever 20 is swung in the longitudinal direction of the vehicle body along the upper longitudinal direction path 41 around the shift axis X, and the forward second speed position F2 and the reverse position R Switch to and.
When the shift lever 20 is operated to the forward second speed position F2, the traveling transmission device 10 enters the second forward speed shuttle forward state, and appears when the driving force from the engine 3 is shifted to the reverse drive state. The forward drive force is changed to a forward driving force at a deceleration rate that is equal to or close to the deceleration rate to be transmitted, and is transmitted to the front and rear wheels 1 and 2 so that the self-propelled vehicle body can start moving forward. The self-running vehicle body travels forward at a travel speed value equal to or close to the travel speed value of the reverse travel.

変速レバー２０を後進位置Ｒに操作すると、走行用変速装置１０が後進状態になり、エンジン３からの駆動力を後進駆動力に変速して前後輪１，２に伝達する。これにより、自走車体が後進走行する。 When the transmission lever 20 is operated to the reverse position R, the traveling transmission 10 is in the reverse state, and the driving force from the engine 3 is shifted to the reverse driving force and transmitted to the front and rear wheels 1 and 2. As a result, the self-propelled vehicle body travels backward.

〔別実施例〕 [Another Example]

前後向き経路を二つ設ける他、３つ以上設けるものの場合にも本発明を適用することができる。いずれの場合も、複数の前後向き経路のうちの最も車体内方側に位置する前後向き経路に後進位置Ｒ、後進状態での減速率に等しいまたはそれに近い減速率を現出する前進状態に走行用変速装置を変速操作する前進位置を設けることにより、本発明の目的を達成することができる。 The present invention can be applied to the case where three or more paths are provided in addition to the provision of two front-rear paths. In either case, the vehicle travels to the forward position where the reverse speed R is equal to or close to the deceleration rate in the reverse state on the forward / backward path located on the innermost side of the vehicle body among the multiple forward / backward paths. The object of the present invention can be achieved by providing a forward movement position for shifting the transmission.

トラクタ全体の側面図Side view of the entire tractor 選択連動機構及び変速連動機構の側面図Side view of selection interlock mechanism and shift interlock mechanism 走行用変速装置の変速操作部の平面図Plan view of the speed change operation part of the travel transmission 走行用変速装置の変速操作軸配設部での断面図Sectional view at the shift operation shaft arrangement portion of the traveling transmission 変速レバー配設部の後面図Rear view of shift lever arrangement 変速レバー、連動軸上部、連動筒軸上部の斜視図Perspective view of gearshift lever, upper part of interlocking shaft, upper part of interlocking cylinder shaft 選択連動機構及び変速連動機構の連動軸、連動筒軸の配設部での断面図Sectional view of the interlocking shaft of the selection interlocking mechanism and the shift interlocking mechanism, and the disposition portion of the interlocking cylinder shaft 変速レバー支持部の断面図Cross section of shift lever support （イ）は、ストッパ板の正面図、（ロ）は、レバーガイドの正面図(A) is a front view of the stopper plate, (B) is a front view of the lever guide. 変速レバー配設部の斜視図 Oblique view of shift lever arrangement portions

５ステアリングハンドル
５ａハンドル軸
６運転部
１０走行用変速装置
２０変速レバー
２３操作部
２６横稈身部
４０レバーガイド
４１，４２前後向き経路
５０仕切り壁体
５８付勢手段
６０シフト連動機構（連動機構）
７０選択連動機構（連動機構）
Ｆ１前進１速位置（低速前進位置）
Ｆ２前進２速位置（シャトル用の前進位置）
Ｆ３前進３速位置（高速前進位置）
Ｒ後進位置
Ｎ中立位置 5 Steering handle 5a Handle shaft 6 Driving unit 10 Traveling transmission 20 Shifting lever 23 Operation unit
26 Horizontal slimming part 40 Lever guide 41, 42 Front-rear path 50 Partition wall body 58 Energizing means
60 Shift interlock mechanism (interlock mechanism)
70 Selective interlocking mechanism (interlocking mechanism)
F1 Forward 1st speed position (Low speed forward position)
F2 forward 2nd gear position (forward position for shuttle)
F3 Forward 3rd speed position (High speed forward position)
R Reverse position N Neutral position

Claims

A steering handle is provided on the upper side of the partition wall body that partitions the driving portion and the driving portion, and the shift gear for traveling is disposed on the side of the handle shaft that rotatably supports the steering handle and below the steering handle. A shift lever for shifting the device is provided,
The shift lever is arranged in a vertical orientation on the lateral side of the base portion of the steering handle inside the partition wall body, and is connected to the vehicle body via an interlocking mechanism that extends rearward from the lower portion of the partition wall body. Linked to the traveling transmission installed at the rear,
The lever guide of the shift lever, formed in the vertical wall portion of the vehicle body vertical direction constituting a side surface of the partition wall, the operation path of the lever guide, and a plurality of longitudinal orientation path arranged in the vertical direction of the vehicle body, the It is composed of a communication path that connects the front and rear intermediate portions of a plurality of front and rear facing paths,
The transmission lever is linked to the upper end portion of the interlocking mechanism inside the partition wall body and extends to the outside of the vertical wall portion. A vertical slimming portion extending upward from the vehicle body, and an operation portion provided at the upper end of the vertical slimming portion,
Wherein the plurality of the vehicle body rear side end portion of the upper front and rear direction path that most located on the vehicle body upper side of the longitudinal direction path, Rutotomoni provided reverse position of the traveling speed change device is shifting operation to the reverse state, the upper A forward position at which the speed change operation is performed in the forward movement state for the shuttle in which the traveling transmission device exhibits a deceleration rate that is equal to or close to the deceleration rate in the reverse movement state is provided at the vehicle body front side end portion of the forward / backward path;
A traveling speed value different from the traveling speed value in the forward traveling state of the shuttle on a lower longitudinal direction path located on the lower side of the vehicle body with respect to the upper longitudinal direction path among the plurality of longitudinal paths. A forward position where the speed change operation is performed in the forward state where
When the speed change lever is operated in the upper front-rear direction path, the speed change lever is moved from the partition wall so that the operation portion of the speed change lever is located near a steering handle that can be operated by a hand that supports the steering handle. An extended tractor shift operating device.

A low-speed forward position at which the traveling transmission is shifted to a low-speed forward state at a lower speed than the shuttle forward state, and the traveling transmission is at a higher speed than the shuttle forward state in the lower front-rear path. The tractor speed change operation device according to claim 1, further comprising a high speed forward position where a speed change operation is performed in the high speed forward state.

The tractor speed change operation device according to claim 1, further comprising an urging means for moving and energizing the shift lever so as to come out of the lower front- rear direction path.

The tractor speed change operation device according to claim 3 , wherein the urging means is configured to urge the shift lever to move in the upper front-rear direction path.

5. A tractor according to claim 4 , wherein a neutral position where the shift lever is positioned and held is provided between the forward position and the reverse position of the upper front-rear path so as to maintain the travel transmission device in a neutral state. Shifting operation device.