JP6181439B2 - Working vehicle - Google Patents

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JP6181439B2
JP6181439B2 JP2013131622A JP2013131622A JP6181439B2 JP 6181439 B2 JP6181439 B2 JP 6181439B2 JP 2013131622 A JP2013131622 A JP 2013131622A JP 2013131622 A JP2013131622 A JP 2013131622A JP 6181439 B2 JP6181439 B2 JP 6181439B2
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main transmission
main
lever
transmission mechanism
parking brake
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JP2015003696A (en
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土江　昌嗣
昌嗣 土江
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Mitsubishi Mahindra Agricultural Machinery Co Ltd
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  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
  • Braking Elements And Transmission Devices (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Transplanting Machines (AREA)

Description

本発明は、乗用田植機などの作業用走行車に関する。   The present invention relates to a work vehicle such as a passenger rice transplanter.

静油圧式無段変速機構（ＨＳＴ）などの無段変速機構からなる主変速機構を備え、主変速レバーによる主変速機構の変速操作にもとづいて走行速度を無段変速可能な作業用走行車が知られている。この種の作業用走行車のなかには、走行中にブレーキペダルを踏み込み操作すると、主変速レバーを中立位置に復帰させる主変速中立復帰機構を備えるものがある。例えば、特許文献１の作業用走行車は、ブレーキペダルを踏み込み操作すると、主変速レバーの中立復帰に応じて静油圧式無段変速機構が中立状態となり、ブレーキが掛かる構造となっている。また、この種の作業用走行車は、通常、ブレーキペダルを踏み込み位置で選択的に係止する駐車ブレーキ機構を備えており、ブレーキペダルを踏み込み位置で選択的に係止した駐車ブレーキ状態では、静油圧式無段変速機構も中立状態に維持される。   A working vehicle having a main transmission mechanism including a continuously variable transmission mechanism such as a hydrostatic continuously variable transmission mechanism (HST) and capable of continuously changing a traveling speed based on a shift operation of the main transmission mechanism by a main transmission lever. Are known. Some types of working vehicles of this type include a main transmission neutral return mechanism that returns a main transmission lever to a neutral position when a brake pedal is depressed during operation. For example, the working vehicle of Patent Document 1 has a structure in which when the brake pedal is depressed, the hydrostatic continuously variable transmission mechanism is neutralized and the brake is applied in response to the neutral return of the main transmission lever. In addition, this type of work vehicle usually includes a parking brake mechanism that selectively locks the brake pedal at the depressed position, and in a parking brake state that selectively locks the brake pedal at the depressed position, The hydrostatic continuously variable transmission mechanism is also maintained in a neutral state.

特開２０１１−１９４９４８号公報JP 2011-194948 A

ところで、この種の作業用走行車では、駐車ブレーキ状態で走行動力系（例えば、副変速機構）や作業動力系（例えば、株間変速機構）の変速操作を行なう場合がある。しかしながら、これらの変速機構がスライディングメッシュ式（選択摺動式）のギヤ変速機構である場合、駆動側ギヤと従動側ギヤの噛み合い位置が合わないと、ギヤの側面同士が干渉して変速ができない可能性がある。従来、このような場合は、一度駐車ブレーキを解除するとともに、主変速レバーを操作してギヤ変速機構の上流側を回転させながら、変速操作を行なっていたが、操作が煩雑なだけでなく、駐車ブレーキ解除により変速操作中に機体が動いてしまう惧れがあった。   By the way, in this type of working vehicle, there is a case where a shifting operation of a traveling power system (for example, a sub-transmission mechanism) or a working power system (for example, a stock transmission mechanism) is performed in a parking brake state. However, when these speed change mechanisms are sliding mesh type (selective sliding type) gear speed change mechanisms, if the meshing positions of the driving side gear and the driven side gear do not match, the side surfaces of the gears interfere with each other to make a speed change. there is a possibility. Conventionally, in such a case, the parking brake is once released and the main speed change lever is operated to rotate the upstream side of the gear speed change mechanism while performing the speed change operation. There was a risk that the aircraft would move during the shifting operation by releasing the parking brake.

本発明は、上記の如き実情に鑑みこれらの課題を解決することを目的として創作されたものであって、請求項１の発明は、原動機の動力を無段変速する主変速機構と、主変速機構を変速操作する主変速レバーと、主変速機構の伝動下流側に設けられ、走行動力又は作業動力を変速するスライディングメッシュ式のギヤ変速機構と、ブレーキペダルの踏み込み操作に応じて走行を制動する走行ブレーキ機構と、ブレーキペダルを踏み込み位置で選択的に係止する駐車ブレーキ機構と、ブレーキペダルの踏み込み操作に応じて主変速レバーを中立位置に復帰させる主変速中立復帰機構とを備える作業用走行車であって、前記主変速中立復帰機構は、ブレーキペダルを踏み込み位置で選択的に係止した駐車ブレーキ状態であっても、所定の融通範囲で主変速レバーによる主変速機構の変速操作を許容する融通手段を備え、該融通手段による融通範囲は、駐車ブレーキ状態であっても主変速レバーが中立位置に復帰される融通操作角度であることを特徴とする作業用走行車である。 The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 includes a main transmission mechanism for continuously changing the power of a prime mover, and a main transmission. A main transmission lever that shifts the mechanism, a sliding mesh gear transmission mechanism that is provided on the downstream side of the transmission of the main transmission mechanism and that shifts the traveling power or working power, and brakes the traveling according to the depression operation of the brake pedal. Work traveling provided with a travel brake mechanism, a parking brake mechanism that selectively locks the brake pedal in the depressed position, and a main shift neutral return mechanism that returns the main transmission lever to the neutral position in response to the depression operation of the brake pedal Even if the vehicle is in a parking brake state in which the main shift neutral return mechanism is selectively locked at a position where the brake pedal is depressed, Comprising a flexible means for allowing the shifting operation of the main speed change mechanism by the main shift lever, the flexibility range of the melting communication means, even in the parking brake state main shift lever is flexible operation angle to be returned to the neutral position This is a featured working vehicle.

請求項１の発明によれば、駐車ブレーキ状態であっても、所定の融通範囲で主変速レバーによる主変速機構の変速操作が許容されるので、駐車ブレーキを解除することなく、主変速レバーを操作して主変速機構の下流側を回転させつつ、ギヤ変速機構の変速操作を行なうことができ、その結果、駐車ブレーキ状態におけるギヤ変速機構の変速操作を簡略化できるだけでなく、変速操作中に機体が動いてしまうような不都合も解消することができる。   According to the first aspect of the invention, even in the parking brake state, the shift operation of the main transmission mechanism by the main transmission lever is allowed within a predetermined interchangeable range, so that the main transmission lever can be operated without releasing the parking brake. The gear shifting mechanism can be shifted while operating to rotate the downstream side of the main transmission mechanism. As a result, not only can the shifting operation of the gear shifting mechanism in the parking brake state be simplified, but also during the shifting operation. Inconveniences that cause the aircraft to move can also be eliminated.

乗用田植機の左側面図である。It is a left view of a riding rice transplanter. 乗用田植機の平面図である。It is a top view of a riding rice transplanter. 乗用田植機の伝動図である。It is a transmission diagram of a riding rice transplanter. 乗用田植機のブレーキ操作系及び主変速操作系を示す平面図である。It is a top view which shows the brake operation system and main transmission operation system of a riding rice transplanter. 乗用田植機のブレーキ操作系及び主変速操作系を示す正面図である。It is a front view which shows the brake operation system and main transmission operation system of a riding rice transplanter. 乗用田植機のブレーキ操作系及び主変速操作系を示す左側面図である。It is a left view which shows the brake operation system and main transmission operation system of a riding rice transplanter. 乗用田植機のブレーキ操作系及び主変速操作系を示す右側面図である。It is a right view which shows the brake operation system and main transmission operation system of a riding rice transplanter. 乗用田植機の主変速操作系及び主変速中立復帰機構を示す斜視図である。It is a perspective view which shows the main transmission operating system and main transmission neutral return mechanism of a riding rice transplanter. 乗用田植機の主変速操作系及び主変速中立復帰機構を示す分解斜視図である。It is a disassembled perspective view which shows the main transmission operating system and main transmission neutral return mechanism of a riding rice transplanter. 乗用田植機の主変速操作系及び主変速中立復帰機構を示す要部拡大側面図である。It is a principal part expanded side view which shows the main transmission operating system and main transmission neutral return mechanism of a riding rice transplanter.

以下、本発明の実施の形態について、図面に基づいて説明する。図面において、１は乗用田植機（作業用走行車）の走行機体であって、該走行機体１は、機体前部に搭載されるエンジン２と、エンジン動力を変速するトランスミッションケース３と、フロントアクスルケース４で支持される左右一対の前輪５と、リヤアクスルケース６で支持される左右一対の後輪７とを備える。エンジン動力は、静油圧式無段変速機構からなる主変速機構８を介してトランスミッションケース３に入力され、ここで変速された動力がフロントアクスルケース４、リヤアクスルケース６及び植付ＰＴＯ軸９に出力される。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of a passenger rice transplanter (working traveling vehicle). The traveling machine body 1 includes an engine 2 mounted on a front portion of the machine body, a transmission case 3 for shifting engine power, and a front axle. A pair of left and right front wheels 5 supported by the case 4 and a pair of left and right rear wheels 7 supported by the rear axle case 6 are provided. Engine power is input to the transmission case 3 via a main transmission mechanism 8 comprising a hydrostatic continuously variable transmission mechanism, and the power shifted here is output to the front axle case 4, the rear axle case 6, and the planted PTO shaft 9. Is done.

走行機体１の後部には、昇降リンク機構１０を介して植付作業部１１が連結されている。植付作業部１１は、昇降リンク機構１０にローリング自在に連結される作業部フレーム１２と、作業部フレーム１２の上方に左右往復動自在に設けられる苗載台１３と、作業部フレーム１２から後方に延出する複数の植付伝動ケース１４と、植付伝動ケース１４の後端部に設けられる植付機構１５と、植付伝動ケース１４の下方に上下揺動自在に設けられるフロート１６とを備えて構成される。   A planting work part 11 is connected to the rear part of the traveling machine body 1 via a lifting link mechanism 10. The planting work unit 11 includes a work unit frame 12 that is connected to the lifting link mechanism 10 so as to be able to roll, a seedling stage 13 that is provided so as to be able to reciprocate left and right above the work unit frame 12, and a rear side from the work unit frame 12 A plurality of planting transmission cases 14, a planting mechanism 15 provided at the rear end of the planting transmission case 14, and a float 16 provided below the planting transmission case 14 so as to be swingable up and down. It is prepared for.

図３に示すように、トランスミッションケース３は、主変速機構８から動力を入力する入力軸１７と、入力軸１７の動力を副変速機構１８を介して前輪動力出力軸１９及び後輪動力出力軸２０に伝動する走行動力伝動経路２１と、入力軸１７の動力を株間変速機構２２、トルクリミッタ２３及び植付クラッチ機構２４を介して植付ＰＴＯ軸９に伝動する植付動力伝動経路２５とを備える。   As shown in FIG. 3, the transmission case 3 includes an input shaft 17 that inputs power from the main transmission mechanism 8, and a front wheel power output shaft 19 and a rear wheel power output shaft that transmit the power of the input shaft 17 via the auxiliary transmission mechanism 18. And a planting power transmission path 25 that transmits the power of the input shaft 17 to the planting PTO shaft 9 via the inter-strain transmission mechanism 22, the torque limiter 23, and the planting clutch mechanism 24. Prepare.

副変速機構１８は、走行動力を段階的に変速するスライディングメッシュ式のギヤ変速機構であり、駆動側の二つの固定ギヤ２６、２７と、従動側の二つのスライドギヤ２８、２９を備え、スライドギヤ２８、２９のスライド操作による選択的な噛み合いによって、中立位置を介した２段階（走行、作業）の変速が可能となる。   The sub-transmission mechanism 18 is a sliding mesh type gear transmission mechanism that changes the driving power stepwise, and includes two fixed gears 26 and 27 on the drive side and two slide gears 28 and 29 on the driven side. By selective engagement by sliding operation of the gears 28 and 29, a two-stage shift (running and working) via the neutral position becomes possible.

株間変速機構２２は、車速に対する植付機構１５の相対的な動作速度を段階的に変速するスライディングメッシュ式のギヤ変速機構であり、駆動側の四つの固定ギヤ３０〜３３と、従動側の二つのスライドギヤ３４、３５を備え、スライドギヤ３４、３５のスライド操作による選択的な噛み合いによって、４段階の変速が可能となる。   The inter-strain transmission mechanism 22 is a sliding mesh type gear transmission mechanism that changes the relative operation speed of the planting mechanism 15 with respect to the vehicle speed in stages, and includes four fixed gears 30 to 33 on the drive side and two on the driven side. Four slide gears 34 and 35 are provided, and a four-stage speed change is possible by selective engagement by sliding operation of the slide gears 34 and 35.

図１及び図２に示すように、走行機体１は、エンジン２が搭載されるエンジン搭載部３６の後方に、オペレータが乗車する運転部３７を備える。運転部３７は、運転座席３８の他に、ステアリングハンドル３９、ブレーキペダル４０、主変速レバー４１などの各種操作具を備えて構成されている。   As shown in FIGS. 1 and 2, the traveling machine body 1 includes a driving unit 37 on which an operator rides behind an engine mounting unit 36 on which the engine 2 is mounted. The driving unit 37 includes various operating tools such as a steering handle 39, a brake pedal 40, and a main transmission lever 41 in addition to the driving seat 38.

図４〜図７に示すように、ブレーキペダル４０は、オペレータの踏み込み操作に応じて、ペダル軸４２を支点として上下回動するペダルアーム４３を備え、該ペダルアーム４３の基部には、上下に突出する一対の連結アーム４４、４５が一体的に設けられている。一方の連結アーム４４は、リヤアクスルケース６に設けられる走行ブレーキ機構４６を作動させるブレーキアーム４６ａに対し、ロッド４７、回動プレート４８及び連結プレート４９を介して連結されており、ブレーキペダル４０の踏み込み操作に応じて走行ブレーキ機構４６を作動させる。   As shown in FIGS. 4 to 7, the brake pedal 40 includes a pedal arm 43 that pivots up and down with the pedal shaft 42 as a fulcrum in response to an operator's stepping operation. A pair of protruding connection arms 44 and 45 are integrally provided. One connecting arm 44 is connected to a brake arm 46 a that operates a traveling brake mechanism 46 provided in the rear axle case 6 via a rod 47, a rotating plate 48, and a connecting plate 49. The traveling brake mechanism 46 is operated according to the operation.

また、ブレーキペダル４０の近傍には、ブレーキペダル４０を踏み込み位置で選択的に係止する駐車ブレーキ機構５０が設けられている。本実施形態の駐車ブレーキ機構５０は、ペダルアーム４３から側方に突出するピン５１と、ブレーキペダル４０の近傍に前後回動自在に設けられ、ピン５１に選択的に係合可能な駐車ブレーキフック５２と、駐車ブレーキフック５２を係合解除方向（前方）に付勢するバネ５３とを備えており、ブレーキペダル４０を踏み込み操作しながら、駐車ブレーキフック５２を手前側に引き、駐車ブレーキフック５２のフック溝５２ａをピン５１に係合させることにより、ブレーキペダル４０を踏み込み位置で選択的に係止し、駐車ブレーキ状態を現出させることができる。また、駐車ブレーキ状態でブレーキペダル４０を踏み込み操作すると、ピン５１が駐車ブレーキフック５２のフック溝５２ａから外れ、駐車ブレーキ状態が解除される。   Further, a parking brake mechanism 50 that selectively locks the brake pedal 40 at a depressed position is provided in the vicinity of the brake pedal 40. The parking brake mechanism 50 according to the present embodiment includes a pin 51 protruding laterally from the pedal arm 43 and a parking brake hook that is provided in the vicinity of the brake pedal 40 so as to be pivotable back and forth and can selectively engage with the pin 51. 52 and a spring 53 that urges the parking brake hook 52 in the disengagement direction (forward). While depressing the brake pedal 40, the parking brake hook 52 is pulled forward, and the parking brake hook 52 By engaging the hook groove 52a with the pin 51, the brake pedal 40 can be selectively locked at the depressed position, and the parking brake state can be revealed. When the brake pedal 40 is depressed in the parking brake state, the pin 51 is disengaged from the hook groove 52a of the parking brake hook 52, and the parking brake state is released.

図４〜図１０に示すように、主変速レバー４１は、左右を向く第一レバー支軸５４を支点とする前後方向の回動操作と、前後を向く第二レバー支軸５５を支点とする左右方向の回動操作が許容されており、レバーガイド５６の直進変速ガイド部５６ａの案内で前後に操作される直進変速操作と、レバーガイド５６の後進変速ガイド部５６ｂの案内で前後に操作される後進変速操作と、レバーガイド５６の中立ガイド部５６ｃの案内で左右に操作され、前進変速操作と後進変速操作を選択的に切換える前後進切換操作とが可能となっている。   As shown in FIGS. 4 to 10, the main transmission lever 41 has a pivoting operation in the front-rear direction with the first lever support shaft 54 facing left and right as a fulcrum and a second lever support shaft 55 facing in the front-rear direction. Rotation operation in the left-right direction is allowed, and the forward / reverse operation is performed forward / backward by the guide of the linear shift guide portion 56a of the lever guide 56 and the forward / backward guide portion 56b of the lever guide 56 is operated forward / backward. And a forward / reverse switching operation for selectively switching between the forward shift operation and the reverse shift operation, which are operated to the left and right by the guide of the neutral guide portion 56c of the lever guide 56.

主変速レバー４１の基部には、主変速レバー４１の前後方向の回動操作に応じて、一体的に前後方向に回動するアーム５７及びカムプレート５８が設けられている。アーム５７は、ロッド５９を介して主変速機構８のトラニオンアーム６０に連結されており、主変速レバー４１の前後方向の回動操作に応じてトラニオンアーム６０を押し引きすることにより、主変速機構８を変速動作させる。   An arm 57 and a cam plate 58 that integrally rotate in the front-rear direction in response to a rotation operation in the front-rear direction of the main speed-change lever 41 are provided at the base of the main speed-change lever 41. The arm 57 is connected to the trunnion arm 60 of the main transmission mechanism 8 via a rod 59, and pushes and pulls the trunnion arm 60 in accordance with the rotation operation of the main transmission lever 41 in the front-rear direction. 8 is shifted.

カムプレート５８は、主変速レバー４１を予め設定される複数の変速操作位置（例えば、中立、前進５段、後進３段）に位置決め保持する位置保持機構６１の構成部品であり、第一レバー支軸５４を中心とする扇形状を有するとともに、その円弧部に複数の位置決め溝５８ａを備える。位置保持機構６１は、カムプレート５８の他に、アーム支軸６２を支点として上下回動自在なローラアーム６３と、ローラアーム６３に設けられるローラ６４と、ローラアーム６３を上方に付勢するバネ６５とを備えて構成され、ローラ６４がバネ６５の付勢力を受けつつカムプレート５８の各位置決め溝５８ａに係合することにより、主変速レバー４１が予め設定される複数の変速操作位置に位置決め保持される。   The cam plate 58 is a component of the position holding mechanism 61 that positions and holds the main speed change lever 41 at a plurality of preset speed change operation positions (for example, neutral, forward 5 steps, reverse 3 steps). While having a fan shape centering on the shaft 54, a plurality of positioning grooves 58a are provided in the arc portion. The position holding mechanism 61 includes, in addition to the cam plate 58, a roller arm 63 that is rotatable up and down with an arm support shaft 62 as a fulcrum, a roller 64 provided on the roller arm 63, and a spring that urges the roller arm 63 upward. 65, and the roller 64 is engaged with each positioning groove 58a of the cam plate 58 while receiving the urging force of the spring 65, whereby the main transmission lever 41 is positioned at a plurality of preset transmission operation positions. Retained.

さらに、主変速レバー４１には、ブレーキペダル４０の踏み込み操作に応じて主変速レバー４１を中立位置に復帰させる主変速中立復帰機構６６が連繋されている。本実施形態の主変速中立復帰機構６６は、第一レバー支軸５４の一端部に一体的に設けられ、カムプレート５８に重合するプレート６７と、プレート６７に突設されてカムプレート５８の係合孔５８ｂに係合するピン６８と、第一レバー支軸５４の他端部に一体的に設けられて左右方向に突出するアーム６９と、該アーム６９の左右両端に突設されるピン６９ａ、６９ｂに対し、長孔７０ａ、７１ａを介して係合する前後一対のロッド７０、７１と、ロッド７０、７１の他端部に連結されるとともに、ロッド７２を介して前述の連結アーム４５に連結される回動部材７３とを備えて構成されている。   Further, the main transmission lever 41 is linked to a main transmission neutral return mechanism 66 that returns the main transmission lever 41 to the neutral position in accordance with the depression operation of the brake pedal 40. The main shift neutral return mechanism 66 of the present embodiment is integrally provided at one end of the first lever support shaft 54, and a plate 67 that overlaps with the cam plate 58, and a projection that protrudes from the plate 67 to engage the cam plate 58. A pin 68 that engages with the joint hole 58b, an arm 69 that is integrally provided at the other end of the first lever support shaft 54 and protrudes in the left-right direction, and pins 69a that protrude from the left and right ends of the arm 69 , 69b are connected to a pair of front and rear rods 70, 71 engaged through the long holes 70a, 71a and the other end of the rods 70, 71, and to the connecting arm 45 through the rod 72. A rotating member 73 to be connected is provided.

ブレーキペダル４０が踏み込み操作されると、連結アーム４５がロッド７２を後方に引くのに伴い、回動部材７３が回動してロッド７０、７１を下方に引く。ロッド７０、７１は、長孔７０ａ、７１ａの上端でピン６９ａ、６９ｂを下方に引き、アーム６９を所定の角度に回動させる。アーム６９が所定の角度になると、アーム６９に第一レバー支軸５４を介して一体的に連結されるプレート６７や、プレート６７にピン６８及び係合孔５８ｂを介して係合されるカムプレート５８、さらには、カムプレート５８と一体的に前後回動する主変速レバー４１も所定の角度となる。したがって、この所定の角度を中立位置と一致するように設定することにより、ブレーキペダル４０の踏み込み操作に応じて、主変速レバー４１を中立位置に自動的に復帰させることが可能になる。   When the brake pedal 40 is depressed, as the connecting arm 45 pulls the rod 72 rearward, the rotating member 73 rotates and pulls the rods 70 and 71 downward. The rods 70 and 71 pull the pins 69a and 69b downward at the upper ends of the long holes 70a and 71a, and rotate the arm 69 to a predetermined angle. When the arm 69 reaches a predetermined angle, the plate 67 is integrally connected to the arm 69 via the first lever support shaft 54, and the cam plate is engaged to the plate 67 via the pin 68 and the engagement hole 58b. 58, and the main transmission lever 41 that rotates back and forth integrally with the cam plate 58 is also at a predetermined angle. Therefore, by setting the predetermined angle so as to coincide with the neutral position, it becomes possible to automatically return the main transmission lever 41 to the neutral position in accordance with the depression operation of the brake pedal 40.

主変速中立復帰機構６６は、ブレーキペダル４０を踏み込み位置で選択的に係止した駐車ブレーキ状態であっても、所定の融通範囲で主変速レバー４１による主変速機構８の変速操作を許容する融通手段を備える。本実施形態の融通手段は、プレート６７のピン６８と、カムプレート５８の係合孔５８ｂとの間に設けられた隙間７４であり、ブレーキペダル４０を踏み込み位置で選択的に係止した駐車ブレーキ状態であっても、隙間７４の範囲で主変速レバー４１を前後に回動操作し、主変速機構８を変速操作することができる。したがって、スライディングメッシュ式のギヤ変速機構である副変速機構１８や株間変速機構２２を駐車ブレーキ状態で変速操作する場合、駐車ブレーキを解除することなく、主変速レバー４１を融通手段の範囲で操作して主変速機構８の下流側を回転させつつ、副変速機構１８や株間変速機構２２の変速操作を行なうことが可能になり、その結果、駐車ブレーキ状態における副変速機構１８や株間変速機構２２の変速操作を簡略化できるだけでなく、駐車ブレーキの解除によって変速操作中に機体が動いてしまうような不都合も解消することができる。   The main shift neutral return mechanism 66 is an accommodation that allows a shift operation of the main transmission mechanism 8 by the main transmission lever 41 within a predetermined accommodation range even in a parking brake state in which the brake pedal 40 is selectively locked at the depressed position. Means. The accommodation means of this embodiment is a gap 74 provided between the pin 68 of the plate 67 and the engagement hole 58b of the cam plate 58, and a parking brake that selectively locks the brake pedal 40 in the depressed position. Even in this state, the main transmission lever 41 can be rotated back and forth within the gap 74 to change the speed of the main transmission mechanism 8. Therefore, when the sub-transmission mechanism 18 or the inter-gear transmission mechanism 22 that is a sliding mesh type gear transmission mechanism is operated in the parking brake state, the main transmission lever 41 is operated within the range of the accommodation means without releasing the parking brake. Thus, the sub-transmission mechanism 18 and the inter-company transmission mechanism 22 can be shifted while rotating the downstream side of the main transmission mechanism 8, and as a result, the sub-transmission mechanism 18 and the inter-mechanism transmission mechanism 22 in the parking brake state can be operated. Not only can the speed change operation be simplified, but also the inconvenience of the airframe moving during the speed change operation by releasing the parking brake can be eliminated.

融通手段の融通範囲である主変速レバー４１の融通操作角度αは、ローラ６４がカムプレート５８の中立用位置決め溝５８ａから逸脱する角度βよりも小さくすることが好ましい。その理由は、駐車ブレーキ状態で主変速レバー４１を操作しつつ、副変速機構１８や株間変速機構２２を変速操作した後、主変速レバー４１を中立位置に戻すことなく手を離したとしても、位置保持機構６１によって主変速レバー４１が自動的に中立位置に戻されるからである。このようにすると、主変速レバー４１の中立位置への戻し忘れにより、駐車ブレーキ解除と同時に機体が急発進することを防止できる。 The accommodation operation angle α of the main transmission lever 41 that is the accommodation range of the accommodation means is preferably smaller than the angle β at which the roller 64 deviates from the neutral positioning groove 58 a of the cam plate 58. The reason for this is that even if the main transmission lever 41 is operated without shifting the main transmission lever 41 to the neutral position after operating the main transmission lever 41 while operating the main transmission lever 41 in the parking brake state, This is because the main transmission lever 41 is automatically returned to the neutral position by the position holding mechanism 61. If it does in this way, it can prevent that an airframe starts suddenly simultaneously with cancellation of a parking brake by forgetting to return to the neutral position of main shift lever 41.

叙述の如く構成された本実施形態によれば、エンジン２の動力を無段変速する主変速機構８と、主変速機構８を変速操作する主変速レバー４１と、主変速機構８の伝動下流側に設けられ、走行動力や作業動力を変速するスライディングメッシュ式の副変速機構１８や株間変速機構２２と、ブレーキペダル４０の踏み込み操作に応じて走行を制動する走行ブレーキ機構４６と、ブレーキペダル４０を踏み込み位置で選択的に係止する駐車ブレーキ機構５０と、ブレーキペダル４０の踏み込み操作に応じて主変速レバー４１を中立位置に復帰させる主変速中立復帰機構６６とを備える乗用田植機であって、主変速中立復帰機構６６は、ブレーキペダル４０を踏み込み位置で選択的に係止した駐車ブレーキ状態であっても、所定の融通範囲で主変速レバー４１による主変速機構８の変速操作を許容する融通手段を備えるので、駐車ブレーキを解除することなく、主変速レバー４１を操作して主変速機構８の下流側を回転させつつ、副変速機構１８や株間変速機構２２の変速操作を行なうことができ、その結果、駐車ブレーキ状態における副変速機構１８や株間変速機構２２の変速操作を簡略化できるだけでなく、駐車ブレーキ解除により変速操作中に機体が動いてしまうような不都合も解消することができる。   According to the present embodiment configured as described, the main transmission mechanism 8 for continuously changing the power of the engine 2, the main transmission lever 41 for shifting the main transmission mechanism 8, and the transmission downstream side of the main transmission mechanism 8. The sliding mesh type sub-transmission mechanism 18 and the inter-company transmission mechanism 22 for shifting the traveling power and the working power, the traveling brake mechanism 46 for braking the traveling in response to the depression operation of the brake pedal 40, and the brake pedal 40 are provided. A riding rice transplanter comprising a parking brake mechanism 50 that selectively locks in a depressed position, and a main shift neutral return mechanism 66 that returns a main shift lever 41 to a neutral position in response to a depression operation of the brake pedal 40, The main shift neutral return mechanism 66 is capable of shifting the main shift within a predetermined range even in a parking brake state in which the brake pedal 40 is selectively locked at the depressed position. Since there is provided a means for allowing the speed change operation of the main speed change mechanism 8 by the bar 41, the sub speed change mechanism is operated while operating the main speed change lever 41 and rotating the downstream side of the main speed change mechanism 8 without releasing the parking brake. 18 and the inter-gear transmission mechanism 22 can be changed. As a result, the speed change operation of the auxiliary transmission mechanism 18 and the inter-gear transmission mechanism 22 in the parking brake state can be simplified. Inconveniences such as moving can be solved.

１ 走行機体
２ エンジン
３ トランスミッションケース
８ 主変速機構
１８ 副変速機構
２２ 株間変速機構
４０ ブレーキペダル
４１ 主変速レバー
４６ 走行ブレーキ機構
５０ 駐車ブレーキ機構
５８ カムプレート
５８ｂ 係合孔
５９ ロッド
６０ トラニオンアーム
６１ 位置保持機構
６６ 主変速中立復帰機構
６７ プレート
６８ ピン
７４ 隙間（融通手段） DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Engine 3 Transmission case 8 Main transmission mechanism 18 Subtransmission mechanism 22 Stock transmission mechanism 40 Brake pedal 41 Main transmission lever 46 Traveling brake mechanism 50 Parking brake mechanism 58 Cam plate 58b Engagement hole 59 Rod 60 Trunnion arm 61 Position holding Mechanism 66 Main shift neutral return mechanism 67 Plate 68 Pin 74 Clearance (conversation means)

Claims (1)

原動機の動力を無段変速する主変速機構と、
主変速機構を変速操作する主変速レバーと、
主変速機構の伝動下流側に設けられ、走行動力又は作業動力を変速するスライディングメッシュ式のギヤ変速機構と、
ブレーキペダルの踏み込み操作に応じて走行を制動する走行ブレーキ機構と、
ブレーキペダルを踏み込み位置で選択的に係止する駐車ブレーキ機構と、
ブレーキペダルの踏み込み操作に応じて主変速レバーを中立位置に復帰させる主変速中立復帰機構とを備える作業用走行車であって、
前記主変速中立復帰機構は、ブレーキペダルを踏み込み位置で選択的に係止した駐車ブレーキ状態であっても、所定の融通範囲で主変速レバーによる主変速機構の変速操作を許容する融通手段を備え、
該融通手段による融通範囲は、駐車ブレーキ状態であっても主変速レバーが中立位置に復帰される融通操作角度であることを特徴とする作業用走行車。
A main transmission mechanism for continuously changing the power of the prime mover;
A main transmission lever for shifting the main transmission mechanism;
A sliding mesh type gear transmission mechanism that is provided on the downstream side of the transmission of the main transmission mechanism and that changes the traveling power or working power;
A travel brake mechanism that brakes the travel in response to the depression of the brake pedal;
A parking brake mechanism that selectively locks the brake pedal in the depressed position;
A working vehicle including a main shift neutral return mechanism that returns a main shift lever to a neutral position in response to a depression operation of a brake pedal;
The main shift neutral return mechanism includes accommodation means for allowing a shift operation of the main transmission mechanism by the main transmission lever within a predetermined accommodation range even in a parking brake state in which the brake pedal is selectively locked at the depressed position. ,
The working vehicle according to claim 1, wherein the accommodation range by the accommodation means is an accommodation operation angle at which the main transmission lever is returned to the neutral position even in a parking brake state .
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