JP2007230358A - Gear shifting device of work vehicle - Google Patents

Gear shifting device of work vehicle Download PDF

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JP2007230358A
JP2007230358A JP2006054183A JP2006054183A JP2007230358A JP 2007230358 A JP2007230358 A JP 2007230358A JP 2006054183 A JP2006054183 A JP 2006054183A JP 2006054183 A JP2006054183 A JP 2006054183A JP 2007230358 A JP2007230358 A JP 2007230358A
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lever
speed change
continuously variable
variable transmission
reverse
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JP4826285B2 (en
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Tsutomu Watabe
勉 渡部
Hideji Ishimaru
秀司 石丸
Chitoshi Matsunaga
千年 松長
Kunihiko Iegi
邦彦 家木
Hidetsugu Tomioka
英嗣 富岡
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Iseki and Co Ltd
Iseki Agricultural Machinery Mfg Co Ltd
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Iseki and Co Ltd
Iseki Agricultural Machinery Mfg Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a gear shifting device of a work vehicle capable of enhancing operability by the interlocking of the speed change operation of a tractor having a HST and the operation of a shuttle operation type forward/backward lever, and obtaining an operational feeling by the speed change lever without any sense of incongruity. <P>SOLUTION: The gear shifting device of the work vehicle comprises a continuously variable transmission (3) for transmitting rotational power to traveling devices (1F, 1R), the continuously variable transmission (3), a speed change lever (6) for changing the output rotation speed of the continuously variable transmission (3), and an interlocking mechanism (L) capable of switching the output rotational direction of the continuously variable transmission (3) to the same operational direction of the speed change lever (6) to the forward direction and the reverse direction based on the switching operation of a forward/backward switching lever (5). The interlocking mechanism (L) sets the output number of the rotation of the continuously variable transmission (3) substantially proportional to the speed change operational amount of the speed change lever (6). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、農業、建築、運搬用の作業車両に関し、特に無段式変速装置を備え、車体の前後進を切り替える所謂シャトル操作式の前後進切替レバーと車速を調整する変速レバーを有する作業車両の変速操作装置に関する。   The present invention relates to a work vehicle for agriculture, construction, and transportation, and in particular, a work vehicle having a continuously variable transmission and having a so-called shuttle operation type forward / reverse switching lever that switches forward and backward of a vehicle body and a shift lever that adjusts the vehicle speed. The present invention relates to a shift operation device.

従来、農業用トラクタには、ギヤ式の前後進切替機構とギヤ式変速装置を備え、ハンドル下方に備える所謂シャトル操作式の前後進切替レバーにて前記前後進切替機構を操作し、操縦席側方に備える変速レバーにて変速装置を操作する構成が知られている。また前記トラクタには、変速装置をHSTにて構成し、単一のレバー(変速レバー)にて車両の前後進と変速を操作する構成も知られている。   Conventionally, agricultural tractors have a geared forward / reverse switching mechanism and a gear-type transmission, and operate the forward / reverse switching mechanism with a so-called shuttle-operated forward / reverse switching lever provided below the steering wheel. A configuration is known in which a transmission is operated by a shift lever provided on the side. Further, the tractor is also known in which the transmission is configured by HST and the vehicle is operated to move forward and backward and shift with a single lever (shift lever).

前記のようにギヤ式変速装置を備え、前後進切替レバーと変速レバーにて車両を操作するトラクタでは、主に前後進を繰り返す高負荷作業、例えばローダ作業等に利用され、一方HSTを備えたトラクタでは、主に細かな車速調整が要望される芝刈作業などに利用される。
特開2003-134903号
As described above, the tractor including the gear-type transmission and operating the vehicle with the forward / reverse switching lever and the shift lever is mainly used for high load work that repeats forward / backward movement, for example, loader work, etc. The tractor is mainly used for lawn mowing work where fine vehicle speed adjustment is required.
JP2003-134903

そして、トラクタのユーザは、主たる作業に応じて、前記HSTを備え、単一のレバーにて車体を操作する仕様か、若しくはギヤ式変速装置を備え、前後進切替レバーと変速レバーにて車体を操作する仕様を選択するものであるので、主たる作業以外の作業、例えばギヤ式変速装置を備えたトラクタで芝刈作業を行う場合は、細かな車速調整ができず操作性が悪く、またHSTを備えたトラクタでは、前後進を繰り返すローダ作業や圃場内での牽引作業で、前後進を切り替える毎に変速位置を調整する必要が生じて前記同様、操作性を損なうものであった。またこれら変速装置を、スイッチやモータといった電気または油圧機器にて構成すると、生産コストが高くつくという課題が想定される。   The tractor user is equipped with the HST according to the main work and is designed to operate the vehicle body with a single lever or with a gear-type transmission, and the vehicle body is moved with the forward / reverse switching lever and the transmission lever. Since the specifications to be operated are selected, when performing lawn mowing work other than the main work, for example, with a tractor equipped with a gear-type transmission, the vehicle speed cannot be finely adjusted and the operability is poor, and the HST is provided. In the tractor, it is necessary to adjust the shift position each time the forward / backward movement is switched in the loader work or the towing work in the field where the forward / backward movement is repeated, and the operability is impaired as described above. Further, if these transmissions are constituted by electric or hydraulic equipment such as switches and motors, a problem that production costs are high is assumed.

この発明は上記課題を鑑みて、作業車両の変速操作装置を以下のように構成した。
即ち、請求項1の発明では、エンジン(E)の回転動力を走行装置(1F,1R)へ伝達する無段変速装置(3)と、該無段変速装置(3)と、該無段変速装置(3)の出力回転速度を変速操作する変速レバー(6)と、前後進切替レバー(5)の切換操作に基づいて前記変速レバー(6)の同一操作方向に対する無段変速装置(3)の出力回転方向を正転方向と逆転方向に切り替えることのできる連動機構(L)を設けたことを特徴とする変速操作装置とした。
In view of the above-mentioned problems, the present invention is configured as follows.
That is, according to the first aspect of the present invention, the continuously variable transmission (3) that transmits the rotational power of the engine (E) to the travel device (1F, 1R), the continuously variable transmission (3), and the continuously variable transmission A continuously variable transmission (3) for the same operating direction of the shift lever (6) based on the switching operation of the shift lever (6) for shifting the output rotational speed of the device (3) and the forward / reverse switching lever (5) A shift operation device characterized in that an interlocking mechanism (L) capable of switching the output rotation direction between the forward rotation direction and the reverse rotation direction is provided.

以上のように構成した請求項1の発明では、前後進切替レバー(5)を操作すると、変速レバー(6)の同一操作方向に対する無段変速装置(3)の出力回転方向は正転方向または逆転方向に切り替わる。
従って進行方向を所定に設定の出力回転にて逆転移動できる。
In the invention of claim 1 configured as described above, when the forward / reverse switching lever (5) is operated, the output rotation direction of the continuously variable transmission (3) with respect to the same operation direction of the transmission lever (6) is the normal rotation direction or Switch to reverse direction.
Therefore, it is possible to reversely move with the output rotation set to a predetermined traveling direction.

また請求項2の発明では、請求項1において、連動機構(L)は、変速レバー(6)の変速操作量に対する無段変速装置(3)の出力回転数を略比例させるよう構成した。このように構成すると、変速レバー(6)の操作量と出力回転数の増減量が比例するため操作感覚が良い。   According to a second aspect of the present invention, in the first aspect, the interlock mechanism (L) is configured so that the output rotational speed of the continuously variable transmission (3) is substantially proportional to the speed change operation amount of the speed change lever (6). If comprised in this way, since the operation amount of a speed-change lever (6) and the increase / decrease amount of an output rotation speed are proportional, an operation feeling is good.

請求項3の発明では、連動機構(L)は、第1係止溝(55b)とこの係止溝(55b)に係合する第1係合ピン(53p)及び第2係止溝(55a)とこの係止溝(55a)に係合する第2係合ピン(54p)とを備える回転台(55)と、該回転台(55)を縦軸(X)回りに回動可能に支持しかつ該回転台(55)を横方向に往復移動可能に支持する回転台支持筒(65)と、回転台(55)の往復移動に伴う前記第2係合ピン(54p)の変位を前記トラニオン軸(7)に伝達するトラニオン軸連動機構(54b,54,54a,56,7a)とを備え、前記回転台支持筒(65)は前記変速レバー(6)の操作に連動して往復移動すべく構成し、前記第1係合ピン(53p)を前後進切替レバー(5)の操作に連動して揺動させることにより回転台(55)を前記縦軸(X)回りに回動させてトラニオン軸(7)の回動可能範囲を前進域(F)から後進域(R)に、又は後進域(R)から前進域(F)に切替えるよう構成してなる請求項1又は請求項2に記載の作業車両における変速操作装置とした。   In the invention of claim 3, the interlock mechanism (L) includes the first locking groove (55b), the first engagement pin (53p) and the second locking groove (55a) that engage with the locking groove (55b). ) And a second engagement pin (54p) that engages with the locking groove (55a), and the turntable (55) is rotatably supported about the vertical axis (X). In addition, the rotary table support cylinder (65) that supports the rotary table (55) so as to be able to reciprocate in the lateral direction, and the displacement of the second engagement pin (54p) accompanying the reciprocating movement of the rotary table (55) A trunnion shaft interlocking mechanism (54b, 54, 54a, 56, 7a) for transmitting to the trunnion shaft (7), and the rotary table support cylinder (65) reciprocally moves in conjunction with the operation of the speed change lever (6). The first engaging pin (53p) is configured to swing in conjunction with the operation of the forward / reverse switching lever (5). By rotating the turntable (55) around the vertical axis (X), the turnable range of the trunnion shaft (7) is changed from the forward range (F) to the reverse range (R), or the reverse range (R). The shift operation device for a work vehicle according to claim 1 or 2, wherein the shift operation device is configured to be switched from a forward range to a forward range (F).

上記のように構成すると、前後進切替レバー(5)を所定に操作し、第1係合ピン(53p)を介して回転台(55)が縦軸(X)回りに回動してトラニオン軸(7)を前進域にて回動するか後進域にて回転するか設定される。この状態から変速レバー(6)を操作すると、回転台支持筒(65)を介して回転台(55)を連動し、第2係止溝(55a)に係合する第2係合ピン(54p)が変位する。この変位をトラニオン軸連動機構(54b,54,54a,56,7a)を介してトラニオン軸(7)に伝達し、増減速する。また、この状態から前記前後進切替レバー(5)を操作すると、第1係合ピン(53p)によって回転台(55)を縦軸(X)回りに回転させ、変速レバー(6)操作を維持した状態でトラニオン軸(7)を前進域(F)と後進域(R)とに相互に切り替える。   When configured as described above, the forward / reverse switching lever (5) is operated in a predetermined manner, and the turntable (55) is rotated about the vertical axis (X) via the first engagement pin (53p) to thereby turn the trunnion shaft. (7) is set to rotate in the forward range or in the reverse range. When the speed change lever (6) is operated from this state, the second engaging pin (54p) that engages the second locking groove (55a) by interlocking with the rotating table (55) via the rotating table support cylinder (65). ) Is displaced. This displacement is transmitted to the trunnion shaft (7) via the trunnion shaft interlocking mechanism (54b, 54, 54a, 56, 7a) to increase and decrease the speed. Further, when the forward / reverse switching lever (5) is operated from this state, the rotating base (55) is rotated about the vertical axis (X) by the first engagement pin (53p), and the operation of the transmission lever (6) is maintained. In this state, the trunnion shaft (7) is switched between the forward range (F) and the reverse range (R).


請求項1乃至請求項3に記載の発明では、細かな車速調整が必要な作業においては、変速レバー(6)にて車速を無段階に調整することができ、また前後進を繰り返す作業では、ギヤ式変速装置を有する車両と同様に、前後進切替レバー(5)にて前後進の切り替え操作ができるので、両形態の作業共に操作性が良い。またこれら連動機構(L)を機械的に構成すると、センサやアクチュエータなど電気、油圧機器にて構成することと比較して安価に構成することができる。

In the invention according to the first to third aspects, in the work that requires fine vehicle speed adjustment, the vehicle speed can be adjusted steplessly with the shift lever (6), and in the work that repeats forward and backward movement, Since the forward / reverse switching operation can be performed by the forward / reverse switching lever (5) as in the case of the vehicle having the gear transmission, the operability is good for both types of work. In addition, when these interlocking mechanisms (L) are mechanically configured, they can be configured at a lower cost than those configured by electric and hydraulic devices such as sensors and actuators.

また請求項2の発明では、変速レバー(6)の操作量と出力回転数の増減量が比例するため、僅かな操作量で急に車速が変動したり、大きく揺動操作しても車速がさほどに変化しないなど操作上の違和感をなくして良好な操作感覚を得る。   In the second aspect of the invention, since the operation amount of the speed change lever (6) is proportional to the increase / decrease amount of the output rotation speed, the vehicle speed fluctuates suddenly with a slight operation amount, or the vehicle speed does not change even if the swing operation is greatly performed. A good operational feeling is obtained by eliminating operational discomfort such as not changing so much.

以下、図面に基づいて、この発明を農業用トラクタに搭載した形態について説明する。
最初にトラクタTの全体構成について説明する。
トラクタTは、図1〜図4に示すように、車体前部のボンネット11内にエンジンEを設け、同エンジンEの回転動力を、伝動ケース12(前方からクラッチハウジング12A、スペーサケース12B、ミッションケース12C)内の伝動機構を介して走行装置となる左右前輪2,2と左右後輪3,3へ伝達する構成としている。 また、前記ミッションケース12Cの後上部には、作業機昇降用油圧シリンダ13を内装するシリンダケース15を設け、このシリンダケース15の左右両側にリフトアーム14,14を回動自在に枢着し、前記シリンダ13のピストン伸縮操作により前記リフトアーム14,14を上下に回動操作する構成となっている。また前記ミッションケース12Cの後部には、トップリンクと左右ロワリンクとから成る三点リンク機構を設け、同リンク機構に各種作業機を連結する構成となっている。
Hereinafter, the form which mounted this invention on the agricultural tractor is demonstrated based on drawing.
First, the overall configuration of the tractor T will be described.
1 to 4, the tractor T is provided with an engine E in the hood 11 at the front of the vehicle body, and the rotational power of the engine E is transmitted to the transmission case 12 (from the front, the clutch housing 12A, the spacer case 12B, the transmission It is configured to transmit to the left and right front wheels 2 and 2 and the left and right rear wheels 3 and 3 as a traveling device via a transmission mechanism in the case 12C). Further, a cylinder case 15 is provided in the rear upper part of the transmission case 12C. The lift case 14 and 14 are pivotally attached to the left and right sides of the cylinder case 15, respectively. The lift arms 14 and 14 are turned up and down by a piston expansion / contraction operation of the cylinder 13. Further, a three-point link mechanism comprising a top link and left and right lower links is provided at the rear part of the transmission case 12C, and various work machines are connected to the link mechanism.

また前記エンジンEの後方には、ハンドルコラム17を立設し、同コラム17にステアリングハンドル19を突設支持すると共に、コラム側部に車体の進行方向を前後に切り替える所謂シャトル操作式の前後進切替レバー5を突設し、レバーガイドに沿わせて前後移動できる構成となっている。また前記前後進切替レバー5は、レバーガイドの係止溝にて「前進」と「中立」と「後進」の三つの操作位置に位置決めする構成となっている。   A handle column 17 is erected on the rear side of the engine E, and a steering handle 19 is protruded and supported on the column 17, and a so-called shuttle operation type forward / backward movement is performed to switch the advancing direction of the vehicle body to the column side. A switching lever 5 is provided so as to move back and forth along the lever guide. The forward / reverse switching lever 5 is positioned at three operation positions of “forward”, “neutral”, and “reverse” in the locking groove of the lever guide.

また前記ハンドル19下方のフロア20上には、左右ブレーキペダル21L,21Rやクラッチペダル22、更にはアクセルペダルを備える構成となっている。
また前記ハンドル19の後方には操縦席2を設け、この操縦席2側方のフェンダー23上に、図9に示すように、前記リフトアーム14を上下回動操作するポジションレバー18と無段変速装置(以下、HST)3の出力回転数を調整する変速レバー6、更には副変速装置の変速位置を切り替える副変速レバー27を設けている。
On the floor 20 below the handle 19, left and right brake pedals 21L and 21R, a clutch pedal 22, and an accelerator pedal are provided.
Further, a cockpit 2 is provided behind the handle 19, and a position lever 18 for continuously rotating the lift arm 14 and a continuously variable transmission on a fender 23 on the side of the cockpit 2 as shown in FIG. A shift lever 6 for adjusting the output rotational speed of the device (hereinafter referred to as HST) 3 and a sub shift lever 27 for switching the shift position of the sub transmission are provided.

次に図4に基づいてトラクタTの動力伝達構成について説明する。
前記エンジンEから出力された回転動力は、前記クラッチペダル22の踏み込み操作にて入り切りされる主クラッチ30を介し、伝動軸を介して無段式変速装置となる前記HST3のポンプ入力軸31へ伝達される。そしてHSTポンプ3pへ入力された回転は、後述するトラニオン軸7の操作角度に応じてHSTモータ3mのモータ出力軸32から出力される。
Next, the power transmission configuration of the tractor T will be described with reference to FIG.
The rotational power output from the engine E is transmitted to the pump input shaft 31 of the HST 3 serving as a continuously variable transmission through the main clutch 30 that is turned on and off by the depression operation of the clutch pedal 22. Is done. The rotation input to the HST pump 3p is output from the motor output shaft 32 of the HST motor 3m in accordance with the operation angle of the trunnion shaft 7 described later.

尚、前記HST3は、図5に示すように、HSTポンプ3pのトラニオン軸7を車体左右中央位置で上向きに突設した状態で配置し、同ポンプ3pの左右一側にHSTモータ3mを備える構成となっている。   As shown in FIG. 5, the HST 3 is arranged with the trunnion shaft 7 of the HST pump 3p protruding upward at the vehicle body left and right center position, and the HST motor 3m is provided on the left and right sides of the pump 3p. It has become.

また前記モータ出力軸32から出力された回転動力は、L,M,Hの三段変速可能なコンスタントメッシュギヤ式副変速装置33へ伝達され、同変速装置で変速された回転を、後輪デフ機構34を介して左右後輪1R,1Rへ伝達し、また前記前輪増側機構35及び前輪デフ機構36を介して左右前輪1F,1Fへ伝達する構成となっている。   The rotational power output from the motor output shaft 32 is transmitted to a constant mesh gear sub-transmission device 33 capable of three-speed shifting of L, M, and H, and the rotation shifted by the transmission device is transmitted to the rear wheel differential. This is transmitted to the left and right rear wheels 1R and 1R via the mechanism 34, and is also transmitted to the left and right front wheels 1F and 1F via the front wheel increasing mechanism 35 and the front wheel differential mechanism 36.

また前記エンジンEの回転動力は、PTO系正逆切替機構及びPTO変速装置を介して前記ミッションケース12Cの背面に突設したPTO軸38へ伝達する構成となっている。   Further, the rotational power of the engine E is transmitted to a PTO shaft 38 projecting from the rear surface of the transmission case 12C via a PTO forward / reverse switching mechanism and a PTO transmission.

尚、図中の符号39は、前記ブレーキペダル21L(21R)の踏み込み操作、若しくは油圧シリンダのピストン伸縮操作で制動する左右後輪ブレーキを示す。
次に図6に基づいてトラクタの油圧回路構成について説明する。
Note that reference numeral 39 in the drawing indicates left and right rear wheel brakes that are braked by a depression operation of the brake pedal 21L (21R) or a piston expansion / contraction operation of a hydraulic cylinder.
Next, the hydraulic circuit configuration of the tractor will be described with reference to FIG.

トラクタTは、第一及び第二の油圧ポンプP1,P2を設け、夫々のポンプは、前記伝動ケース3内に充填した作動油兼潤滑油を吸い上げて、各油圧アクチュエータへ送り込む構成となっている。前記第一ポンプP1は、回路上手側でパワーステアリング用油路L19に圧油を送り込み、この余剰油をHST3の閉回路L3内にチャージ油として送り込む構成となっている。また前記第二ポンプP2は、切替制御弁39を介して前記作業機昇降用油圧シリンダ13へ圧油を送り込む構成となっている。   The tractor T is provided with first and second hydraulic pumps P1 and P2, and each pump is configured to suck up hydraulic oil / lubricating oil filled in the transmission case 3 and send it to each hydraulic actuator. . The first pump P1 is configured such that pressure oil is sent to the power steering oil passage L19 on the upper side of the circuit, and this surplus oil is fed as charge oil into the closed circuit L3 of the HST3. The second pump P <b> 2 is configured to send pressure oil to the working machine lifting / lowering hydraulic cylinder 13 via the switching control valve 39.

尚、図中、符号7はHSTポンプ3pの斜板を操作するトラニオン軸を示し、中立位置から正・逆転、即ち車両を前進側または後進側に連動操作されるようになっており、該中立位置Nを挟んで前進域Fと後進域Rとに渡って操作され、中立位置Nからの回転角度が増すほど出力回転数が小から大に変更されるようになっている。図中符号40はオイルクーラ、41はフィルターを示す。   In the figure, reference numeral 7 denotes a trunnion shaft for operating the swash plate of the HST pump 3p. The neutral position is forward / reverse, that is, the vehicle is operated in conjunction with the forward or reverse side. The engine is operated over the forward region F and the reverse region R across the position N, and the output rotational speed is changed from small to large as the rotational angle from the neutral position N increases. In the figure, reference numeral 40 denotes an oil cooler, and 41 denotes a filter.

次に、この発明の要部となる前記HST3の変速操作装置の構成について説明する。
この変速操作装置は、前記前後進切替レバー5と変速レバー6と、前記スペーサケース12B内に備えたレバー連動機構(連動機構)L等から構成されている。
Next, a description will be given of the structure of the HST3 speed change operation device, which is a main part of the present invention.
This speed change operation device includes the forward / reverse switching lever 5, the speed change lever 6, and a lever interlocking mechanism (interlocking mechanism) L provided in the spacer case 12B.

詳しくは、図7に示すように、前記前後進切替レバー5の基部は、前記ハンドルコラム17内の連動軸50を介してクラッチハウジング12A上面の連動アーム51に連動連結され、同アーム51とスペーサケース12B上面に突出した前後進入力アーム52とを長さ調整具となる伸縮調整ロッド53Aを介して連結する構成となっている。これにより、連動軸50回りの回動操作力が連動アーム51,伸縮調整ロッド53A,入力アーム52を経て前後進入力軸53に伝達され、該前後進入力軸53を正逆に回動しうる構成である。なお、伸縮調整ロッド53Aの長さ調整によって前後進入力アーム52の回動位置を調整し、後述するHST3のトラニオン軸7の中立位置を調整することができる。   Specifically, as shown in FIG. 7, the base portion of the forward / reverse switching lever 5 is interlocked and connected to the interlocking arm 51 on the upper surface of the clutch housing 12 </ b> A via the interlocking shaft 50 in the handle column 17. The forward / reverse input arm 52 protruding from the upper surface of the case 12B is connected via an expansion / contraction adjustment rod 53A serving as a length adjustment tool. Thereby, the turning operation force around the interlocking shaft 50 is transmitted to the forward / reverse input shaft 53 via the interlocking arm 51, the expansion / contraction adjusting rod 53A, and the input arm 52, and the forward / backward input shaft 53 can be rotated forward and backward. It is a configuration. In addition, by adjusting the length of the telescopic adjustment rod 53A, the rotational position of the forward / reverse input arm 52 can be adjusted, and the neutral position of the trunnion shaft 7 of the HST 3 to be described later can be adjusted.

また前記前後進入力アーム52は、図8に示すように、スペーサケース12B内に貫通させ、且つ上下方向に配す前後進入力軸53に取り付けられ、この前後進入力軸53は、軸下部に二本のアーム片(以下、上連動アーム54aと下連動アーム54b)を有する筒軸54に回転自在に挿通支持されるもので、同軸下端部にアーム片(以下、前後進切替アーム53a)を固設する構成となっている。   As shown in FIG. 8, the forward / reverse input arm 52 is attached to a forward / reverse input shaft 53 that passes through the spacer case 12B and is arranged in the vertical direction. It is rotatably supported by a cylindrical shaft 54 having two arm pieces (hereinafter referred to as an upper interlocking arm 54a and a lower interlocking arm 54b), and an arm piece (hereinafter referred to as a forward / reverse switching arm 53a) is provided at the lower end of the same axis. It is configured to be fixed.

また前記前後進切替アーム53aの先端部には、下方へ突設する第1係合ピン53pを設けると共に、前記筒軸54の下連動アーム54bの先端部にも、下方へ突設する第2係合ピン54pを設ける。両ピン53p,54pを前記前後進入力軸53の下方に配置した回転台55の長穴状第1係止溝55a、及び第2係止溝55bに係止する構成となっている。   Further, a first engaging pin 53p protruding downward is provided at the tip of the forward / reverse switching arm 53a, and a second protrusion protruding downward also at the tip of the lower interlocking arm 54b of the cylindrical shaft 54 is provided. An engagement pin 54p is provided. Both pins 53p and 54p are configured to be locked in the first and second locking grooves 55a and 55b of the rotary base 55 disposed below the forward / reverse input shaft 53.

そして前記回転台55は前後進入力軸53に平行の縦軸Xを備えて該入力軸53近傍に配置され、第1係合ピン53pの揺動に伴い、回転台55を中立位置を挟んで前進側連動姿勢(a)と後進側連動姿勢(b)に姿勢変更する構成としている。即ち、第1係合ピン53pは回転台55の第1係止溝55bに係合しているため、第1係合ピン53pの揺動運動は回転台55を縦軸Xまわりに回動して、上記前進側または後進側連動姿勢(a)(b)に切り替わるようになっている(図9(B))。   The turntable 55 has a longitudinal axis X parallel to the forward / reverse input shaft 53 and is disposed in the vicinity of the input shaft 53, and the turntable 55 is sandwiched between the neutral position as the first engagement pin 53p swings. The posture is changed to the forward-side interlocking posture (a) and the reverse-side interlocking posture (b). That is, since the first engagement pin 53p is engaged with the first locking groove 55b of the turntable 55, the swinging motion of the first engagement pin 53p rotates the turntable 55 around the vertical axis X. Thus, the position is switched to the forward-side or reverse-side interlocking posture (a) (b) (FIG. 9B).

また前記上連動アーム54aは、連動プレート56を介して前記トラニオン軸7と一体のトラニオン軸操作アーム7aへ回動自在に連結する構成となっていて、下連動アーム54b,筒軸54,上連動アーム54a,連動プレート56及びトラニオン軸操作アーム7aをもってトラニオン軸連動機構を構成する。   The upper interlocking arm 54a is rotatably connected to the trunnion shaft operating arm 7a integral with the trunnion shaft 7 via the interlocking plate 56, and includes a lower interlocking arm 54b, a cylinder shaft 54, and an upper interlocking member. The arm 54a, the interlocking plate 56, and the trunnion shaft operating arm 7a constitute a trunnion shaft interlocking mechanism.

一方、前記変速レバー6の基部は、前記フェンダー23内側の連動軸を介して変速入力軸63に連結する構成となっている。この変速入力軸63には、軸先端部にシフターアーム63aを固設し、同アーム63aを回転台支持筒65に係合させて前記回転台55を前後に移動可能に設けている。即ち、回転台支持筒65は前後方向に軸心を配する支持軸64に沿って前後にスライド自在に支持される構成となっている。   On the other hand, the base of the speed change lever 6 is connected to the speed change input shaft 63 via an interlocking shaft inside the fender 23. The shift input shaft 63 is provided with a shifter arm 63a fixed to the tip of the shaft, and the arm 63a is engaged with a turntable support cylinder 65 so that the turntable 55 can be moved back and forth. That is, the turntable support cylinder 65 is configured to be slidable back and forth along a support shaft 64 having an axial center in the front-rear direction.

上記の回転台支持筒65のスライド移動は、回転台55を直線的に前後移動するものであり、例えば、前記前進側連動姿勢(a)で回転台55が前側に移動すると、前記長孔状係止溝55aが平行移動してこれに嵌合する第2係合ピン54pが摺動して移動するが、係止溝55aの方向性に規制された動きとなるため第2係合ピン54pの動きは、例えば図10(A)においてシフターアーム63aがSminからSmax側に向けた動きを採ると、図10中(E)の実線から仮想線に示すように縦軸X回りに時計方向に変位し、これに伴い、上連動アーム54bを図10(C)中時計回りに連動させることにより、連動プレート56を押してトラニオン軸7を中立位置Nから前進域Fの範囲を揺動させる。逆にシフターアーム63aがSmaxからSminに向けて移動するとトラニオン軸7は前進域Fの範囲で中立位置Nを限界としてこの位置まで戻される構成である。   The sliding movement of the turntable support cylinder 65 is to move the turntable 55 back and forth linearly. For example, when the turntable 55 moves to the front side in the forward movement interlocking posture (a), the oblong hole shape is formed. The locking groove 55a moves in parallel and the second engagement pin 54p fitted to the locking groove 55a slides and moves. However, since the movement is restricted by the directionality of the locking groove 55a, the second engagement pin 54p. For example, when the shifter arm 63a moves from Smin toward Smax in FIG. 10A, the movement in the clockwise direction about the vertical axis X as shown by the phantom line from the solid line in FIG. Accordingly, the upper interlocking arm 54b is interlocked clockwise in FIG. 10C, thereby pushing the interlocking plate 56 and swinging the trunnion shaft 7 from the neutral position N to the forward range F. On the contrary, when the shifter arm 63a moves from Smax toward Smin, the trunnion shaft 7 is returned to this position within the range of the forward travel region F with the neutral position N as a limit.

また、前記回転台55が後進側連動姿勢(b)にあってシフターアーム63aがSminからSmax側に向けた動きを採ると、図11(E)のように第2係合ピン54pは反時計方向に変位し、これに連動して上連動アーム54bを図11(C)中反時計回りとさせることにより、連動プレート56を引いてトラニオン軸操作アーム7aを中立位置Nから後進域Rの範囲を揺動させる。逆にシフターアーム63aがSmaxからSminに向けて移動するとトラニオン軸7は後進域Rの範囲で中立位置Nを限界としてこの位置まで戻される構成である。   Further, when the turntable 55 is in the reverse geared linkage position (b) and the shifter arm 63a moves from Smin toward Smax, the second engagement pin 54p is counterclockwise as shown in FIG. When the upper interlocking arm 54b is rotated counterclockwise in FIG. 11C in conjunction with this, the interlocking plate 56 is pulled to move the trunnion shaft operating arm 7a from the neutral position N to the reverse range R. Oscillate. On the contrary, when the shifter arm 63a moves from Smax to Smin, the trunnion shaft 7 is returned to this position within the range of the reverse travel region R with the neutral position N as a limit.

上記のように、回転台支持筒65のスライド移動は、前記変速レバー6の前後揺動運動に連動するシフターアーム63aの支点周りの揺動運動による。また、スライド移動が第2係合ピン54pを連動し、トラニオン軸7を前進域Fまたは後進域Rの範囲で回転させるが、変速レバー6の前後揺動量に比例するトラニオン軸7回転量となるよう、本実施例では、前記シフターアーム63aの支点周りの回転範囲を前後振り分け配置位置(角度αの範囲で回動する)よりやや前側に位相をずらせた位置(角度βの範囲で回動する)に設定している(図13)。その結果、図14実線に示すように、変速レバー6の操作量に対してトラニオン軸7の回転量が略比例的に推移する。このため、変速レバー6の中立位置に近い側から遠ざかる側にかけて略比例的に速度が変更できるものとなって操作感覚を良好となす。即ち、変速レバー(6)の操作量と出力回転数の増減量が比例するため、僅かな操作量で急に車速が変動したり、大きく揺動操作しても車速がさほどに変化しないなど操作上の違和感をなくし得て、操作感覚を良好とする。   As described above, the sliding movement of the turntable support cylinder 65 is due to the swinging motion around the fulcrum of the shifter arm 63a that is linked to the swinging motion of the shift lever 6 in the longitudinal direction. Further, the slide movement interlocks with the second engagement pin 54p and rotates the trunnion shaft 7 in the range of the forward range F or the reverse range R. However, the rotation amount of the trunnion shaft 7 is proportional to the forward / backward swing amount of the speed change lever 6. Thus, in the present embodiment, the rotation range around the fulcrum of the shifter arm 63a is rotated in a position slightly shifted to the front side (rotation in the range of angle α) (rotation in the range of angle β). ) (FIG. 13). As a result, as shown by the solid line in FIG. 14, the rotation amount of the trunnion shaft 7 changes substantially in proportion to the operation amount of the speed change lever 6. For this reason, the speed can be changed approximately proportionally from the side closer to the neutral position of the speed change lever 6 to the side away from it, and the operating feeling is improved. That is, since the operation amount of the speed change lever (6) is proportional to the increase / decrease amount of the output rotation speed, the vehicle speed fluctuates suddenly with a slight operation amount, or the vehicle speed does not change so much even if it is greatly swung. The above feeling of incongruity can be eliminated and the operational feeling is improved.

なお、図14の点線で示すように、上記前後振り分け配置では急に速度が増して危険である。
また、上記角度α(の範囲で回動)と角度β(の範囲で回動)とのずれ量はシフターアーム63aの有効長、支点周りの回動量、その後の連動機構のリンク比等に影響されるものであるが、上記のようにシフターアーム63aの変速入力軸63に対する円周方向の取付位置の調整設定によってトラニオン軸7回転量の動きを調整することで、変速レバー6の操作と前後進切替レバー5の操作とを融合させる回転台55の動きを直接制御でき、当該調整も容易に行なうことができる。調整の具体的構成は、変速操作入力軸63とシフターアーム63aとをセレーション嵌合することで変速操作入力軸63の外周所定の位置にシフターアーム63aを固定することができる。セレーション嵌合のほか、止めボルトで押し付け固定する構成でもよい。
Note that, as shown by the dotted line in FIG. 14, the above-described front-rear sorting arrangement is dangerous because the speed suddenly increases.
Further, the amount of deviation between the angle α (turning within the range) and the angle β (turning within the range) affects the effective length of the shifter arm 63a, the turning amount around the fulcrum, the link ratio of the subsequent interlocking mechanism, and the like. As described above, by adjusting the movement of the rotation amount of the trunnion shaft 7 according to the adjustment setting of the circumferential mounting position of the shifter arm 63a with respect to the transmission input shaft 63, the operation of the transmission lever 6 and the front and rear The movement of the turntable 55 that fuses the operation of the advance switch lever 5 can be directly controlled, and the adjustment can be easily performed. The specific configuration of the adjustment is that the shifter arm 63a can be fixed at a predetermined position on the outer periphery of the shift operation input shaft 63 by serration fitting the shift operation input shaft 63 and the shifter arm 63a. In addition to serration fitting, it may be configured to be fixed by pressing with a set bolt.

なお、ミッションケースに対して変速操作入力軸63を支持する支持メタル63bをボルトによって締結する構成である。
尚、図8中符号66は、前記支持軸64に備える部材をスペーサケース12Bのコーナ部に取り付ける取付ブラケットを示す。
In addition, it is the structure which fastens the support metal 63b which supports the transmission operation input shaft 63 with a volt | bolt with respect to a mission case.
In addition, the code | symbol 66 in FIG. 8 shows the attachment bracket which attaches the member with which the said support shaft 64 is equipped to the corner part of spacer case 12B.

さらに変速入力軸63に記載した一点鎖線Sminは、前記変速レバー6を最低速位置に設定した時のシフターアーム63aの位置を示し、一点鎖線Smaxは変速レバー6を最高速位置に設定した時のシフターアーム63aの位置を示す。   Further, the alternate long and short dash line Smin described in the shift input shaft 63 indicates the position of the shifter arm 63a when the shift lever 6 is set to the lowest speed position, and the alternate long and short dash line Smax indicates when the shift lever 6 is set to the highest speed position. The position of the shifter arm 63a is shown.

以上のように構成したレバー連動機構Lは、前記前後進切替レバー5を「前進」位置、「中立」位置、「後進」位置に回動保持することで、前後進入力軸53及び前後進切替アーム53aを回動させ、同アーム53aに備えた第1係合ピン53pの位置を前記「前進」位置、「中立」位置、「後進」位置に対応する位置にそれぞれ位置決めする。これにより、前記回転台55の角度、詳しくは前進、後進、中立位置での初期位置が設定される。即ち、前記トラニオン軸7に対する位置を変更する。そして前記夫々の初期位置で、前記変速レバー6を前後に操作すると、変速入力軸63及びシフターアーム63aを回転させ、回転台支持筒65を支持軸64上をスライド移動させる。これにより、係合するピン54p及び筒軸54が回転し、更に上連動アーム54a、連動プレート56、トラニオン軸操作アーム7aの連動を介して前記トラニオン軸7の回動位置が変更される。よって、HSTモータ3mから出力される回転動力が変速され、車速が変速される。   The lever interlocking mechanism L configured as described above rotates and holds the forward / reverse switching lever 5 in the “forward” position, the “neutral” position, and the “reverse” position, so that the forward / reverse input shaft 53 and the forward / reverse switching are performed. The arm 53a is rotated, and the positions of the first engagement pins 53p provided on the arm 53a are respectively positioned at positions corresponding to the “forward” position, the “neutral” position, and the “reverse” position. Thereby, the angle of the turntable 55, specifically, the initial position at the forward, reverse and neutral positions is set. That is, the position with respect to the trunnion shaft 7 is changed. When the shift lever 6 is operated back and forth at the respective initial positions, the shift input shaft 63 and the shifter arm 63a are rotated, and the turntable support cylinder 65 is slid on the support shaft 64. As a result, the engaging pin 54p and the cylinder shaft 54 rotate, and the rotational position of the trunnion shaft 7 is changed through the interlocking of the upper interlocking arm 54a, the interlocking plate 56, and the trunnion shaft operating arm 7a. Therefore, the rotational power output from the HST motor 3m is shifted, and the vehicle speed is shifted.

各状態の作用を具体的に説明する。
図12は、前後進切替レバー5を「中立」位置に設定し、変速レバー6を「最低速」位置に設定したレバー連動機構Lを示す。この場合、平面視で前記回転台55と支持軸64が略平行状態であり、前記前後進入力軸53及び同軸53と一体のピン53pと筒軸54のピン54pが略一直線上に配置される為、変速レバー6を高速若しくは低速側へ回動操作しても、前記回転台55の係止溝55a内を両ピン53p,54pが摩擦抵抗無く移動するだけであり、下連動アーム54bは回動角を維持する。よって、変速レバー6の操作をトラニオン軸7へ伝達しない構成、即ち変速操作を無効とする。
The action of each state will be specifically described.
FIG. 12 shows the lever interlocking mechanism L in which the forward / reverse switching lever 5 is set to the “neutral” position and the transmission lever 6 is set to the “lowest speed” position. In this case, the rotary base 55 and the support shaft 64 are in a substantially parallel state in plan view, and the pin 53p integrated with the forward / reverse input shaft 53 and the coaxial 53 and the pin 54p of the tube shaft 54 are arranged on a substantially straight line. Therefore, even if the speed change lever 6 is rotated to the high speed or low speed side, both the pins 53p and 54p only move within the locking groove 55a of the turntable 55 without frictional resistance, and the lower interlocking arm 54b is rotated. Maintain a moving angle. Therefore, the configuration in which the operation of the shift lever 6 is not transmitted to the trunnion shaft 7, that is, the shift operation is invalidated.

また図10は、前後進切替レバー5を「前進」位置に設定し、変速レバー6を「最低速」位置に設定した状態を示す。この場合、前記前後進切替アーム53aの前記第1係合ピン53pは、支持軸64に対し平面視(図10中(C))で、前記「中立」位置に設定した場合よりも、離れた位置に設定される。そして、前記変速レバー6を高速側へ回動操作すると、前記変速入力軸63の回動と共に回転台55が支持軸64上を前方へスライド操作され、前記ピン53pが回転台55の係止溝55a内で摩擦摺動することで、前記ピン54p及びこれと一体の筒軸54が回転し、上連動アーム54a、連結プレート56、トラニオン軸取付アーム7aの動きを介してトラニオン軸7を前進操作域で回動する。よって、車両を前進域で変速する。   FIG. 10 shows a state in which the forward / reverse switching lever 5 is set to the “forward” position and the transmission lever 6 is set to the “lowest speed” position. In this case, the first engagement pin 53p of the forward / reverse switching arm 53a is separated from the support shaft 64 in a plan view ((C) in FIG. 10) than when the "neutral" position is set. Set to position. When the speed change lever 6 is turned to the high speed side, the turntable 55 is slid forward on the support shaft 64 along with the turn of the speed change input shaft 63, and the pin 53 p is a locking groove of the turntable 55. By sliding frictionally in 55a, the pin 54p and the cylindrical shaft 54 integrated therewith rotate, and the trunnion shaft 7 is moved forward through the movement of the upper interlocking arm 54a, the connecting plate 56, and the trunnion shaft mounting arm 7a. Rotate in the area. Therefore, the vehicle is shifted in the forward range.

また図11は、前後進切替レバー5を「後進」位置に設定し、変速レバー6を「最低速」位置に設定した状態を示す。この場合、前記前後進切替アーム53aの前記第1係合ピン53pは、支持軸64に対し平面視(図11中(c))で、前記「中立」位置に設定した場合よりも、接近した位置に設定される。そして、前記変速レバー6を高速側へ回動操作すると、前記変速入力軸63の回動と共に回転台55が支持軸64上を前方へスライド操作され、前記ピン53pが回転台55の係止溝55a内で摩擦摺動することで、前記ピン54p及びこれと一体の筒軸54が回転し、上連動アーム54a、連結プレート56、トラニオン軸取付アーム7aの動きを介してトラニオン軸7を後進操作域で回動する。よって、車両を後進域で変速する。   FIG. 11 shows a state in which the forward / reverse switching lever 5 is set to the “reverse” position and the transmission lever 6 is set to the “lowest speed” position. In this case, the first engagement pin 53p of the forward / reverse switching arm 53a is closer to the support shaft 64 than when it is set to the "neutral" position in plan view ((c) in FIG. 11). Set to position. When the speed change lever 6 is turned to the high speed side, the turntable 55 is slid forward on the support shaft 64 along with the turn of the speed change input shaft 63, and the pin 53 p is a locking groove of the turntable 55. By sliding frictionally within 55a, the pin 54p and the cylindrical shaft 54 integral therewith rotate, and the trunnion shaft 7 is operated backwards through the movement of the upper interlocking arm 54a, the connecting plate 56, and the trunnion shaft mounting arm 7a. Rotate in the area. Therefore, the vehicle is shifted in the reverse range.

また、前記図10(E)の仮想線の状態、即ち前進域Fの所定速に選択した状態から、前後進切替レバー5を後進側に操作すると、第1係合ピン53pは第1係止溝55bを介して回転台55を後進側連動姿勢(b)に切替える。このとき回転台支持筒65は移動せず、縦軸Xを維持した状態で図9(B)の実線状態から仮想線に示す状態に回転台55は回転できる。従って、第2係合ピン54pは図9(B)の実線位置から仮想線に示す状態に大きく変位し、トラニオン軸(7)を前進域(F)から中立位置を越えて後進域(R)の所定速まで迅速に移行する。オペレータは前後進切替レバー5を切替するだけで変速レバー6操作を必要としないため前進、後進の反復を頻繁に行うローダ作業に適している。   In addition, when the forward / reverse switching lever 5 is operated to the reverse side from the state of the imaginary line in FIG. The turntable 55 is switched to the reverse-side interlocking posture (b) via the stop groove 55b. At this time, the turntable support cylinder 65 does not move, and the turntable 55 can be rotated from the solid line state of FIG. Accordingly, the second engagement pin 54p is greatly displaced from the solid line position in FIG. 9B to the state indicated by the phantom line, and the trunnion shaft (7) is moved from the forward movement area (F) beyond the neutral position to the reverse movement area (R). It moves quickly to a predetermined speed. Since the operator only switches the forward / reverse switching lever 5 and does not require the operation of the shift lever 6, it is suitable for loader work that frequently repeats forward and reverse.

そして、前後進切替レバー5の切換操作に基づいて出力回転方向を正転方向と逆転方向に切り替えられるが、速度を変更するときは、出力回転方向が正転方向か逆転方向かに関係なく前記変速レバー6を後方に操作すると減速し、前方に操作すると増速することができる
また前記レバー連動機構Lでは、前記前後進切替アーム53aを前記支持軸64に対し若干角度を持たせ、前後進切替レバー5を「中立」操作時、ピン53pが「前進」位置に変位させることで、前後進切替レバー5を「後進」位置に設定した場合は、「前進」位置に設定した場合よりも、変速範囲が狭く、且つ高車速とならないように設定している。
The output rotation direction can be switched between the normal rotation direction and the reverse rotation direction based on the switching operation of the forward / reverse switching lever 5, but when changing the speed, the output rotation direction is the normal rotation direction or the reverse rotation direction. When the shift lever 6 is operated backward, the speed can be reduced, and when operated forward, the speed can be increased. In the lever interlocking mechanism L, the forward / reverse switching arm 53a is slightly angled with respect to the support shaft 64 so as to move forward / backward. When the switch lever 5 is set to the “neutral” operation, the pin 53p is displaced to the “forward” position so that the forward / reverse switch lever 5 is set to the “reverse” position than the “forward” position. The speed change range is narrow and the vehicle speed is set not to be high.

以上のように構成したHSTの変速操作装置は、細かな車速調整が必要な作業においては、従来通り、変速レバー6にて車速を無段階に調整することができ、また前後進を繰り返す作業では、ギヤ式変速装置を有する車両と同様に、前後進切替レバー5にて前後進の切り替え操作ができるので、両形態の作業共に操作性が良い。またこれら連動機構を機械的連動機構にて構成したので、同操作装置をセンサやアクチュエータなど電気、油圧機器にて構成することと比較して安価に構成することができる。   The HST speed change operation device configured as described above can adjust the vehicle speed steplessly with the speed change lever 6 in the work that requires fine adjustment of the vehicle speed, and in the work that repeats forward and backward movements as usual. Since the forward / reverse switching operation can be performed by the forward / reverse switching lever 5 as in the case of the vehicle having the gear type transmission, the operability is good for both types of work. In addition, since these interlocking mechanisms are configured by mechanical interlocking mechanisms, the operation device can be configured at a lower cost compared to configuring the operation device by electric or hydraulic equipment such as sensors and actuators.

また前記レバー連動機構Lでは、前後進切替レバー5を「前進」位置、若しくは「後進」位置に操作し、クラッチを接続すると同時に、車両が発進する構成となっているので、例えば変速レバー6を別途操作しないと発進しない構成と比較して、操作位置を間違え難くまた作業を迅速に開始することができる。   In the lever interlocking mechanism L, the forward / reverse switching lever 5 is operated to the “forward” position or the “reverse” position to engage the clutch and simultaneously start the vehicle. Compared with a configuration in which the vehicle does not start unless it is operated separately, the operation position is less likely to be mistaken and the work can be started quickly.

次に図15他に基づいて、前記レバー連動機構Lの取り付け構成について説明する。
前記ブラケット66は、前部と後部に取付穴66f,66rを備え、この取付穴66f,66rを前記スペーサケース12B内コーナ部の壁面にボルトにて取り付ける構成となっている。またケース12B内には、ラインXの位置の高さまで潤滑油兼HSTの作動油を充填する構成となっている。
Next, the mounting structure of the lever interlocking mechanism L will be described based on FIG. 15 and others.
The bracket 66 includes mounting holes 66f and 66r at the front and rear portions, and the mounting holes 66f and 66r are mounted to the wall surface of the corner portion in the spacer case 12B with bolts. Further, the case 12B is configured to be filled with lubricating oil and HST hydraulic oil up to the height of the line X.

これにより、前記レバー連動機構Lの一部、詳しくは、回転台33の高さまで潤滑油に浸かる為、磨耗による作動不良を防止することができる。また同レバー連動機構は、詳しくは前後進入力軸53と変速入力軸63以下の伝動下手側の部材は、異物との接触や腐食による作動不良を防止することができる。   Thereby, since a part of the lever interlocking mechanism L, specifically, the level of the turntable 33 is immersed in the lubricating oil, it is possible to prevent malfunction due to wear. Further, in the lever interlocking mechanism, in detail, the lower transmission member below the forward / reverse input shaft 53 and the speed change input shaft 63 can prevent malfunction due to contact with foreign matter or corrosion.

回転台支持筒65のスライド移動は回転台支持筒65を前後方向の支持軸64に支持されることで可能となるが、図16の実施例では、この支持軸64を左右一対に設けてなり、回転台支持筒65の支持を安定よく行なうことができる。   The slide movement of the turntable support cylinder 65 can be performed by supporting the turntable support cylinder 65 on the support shaft 64 in the front-rear direction, but in the embodiment of FIG. The support for the turntable support cylinder 65 can be performed stably.

シフターアーム63aの操作回動入力軸63に対する取付角度を異ならせて構成することにより、変速レバー6の回動操作量に対するトラニオン軸7の回転量を所定に設定できるものであるが、この支点位置の設定を前記支持メタル63bの着脱により、ミッションケースの外部から調節設定可能に構成することにより、変速レバー6操作感覚とトラニオン軸7の回転量とを調節設定でき、オペレータの好みの操作感覚を得ることができる。例えば、低速走行時には変速レバー6の小さい揺動操作量xで所定角θのトラニオン軸7回転を得るようになし、一方高速走行時には変速レバー6の大きい揺動操作量y(>x)で所定角θのトラニオン軸7回転を得るように設定すると、高速での変速レバー6揺動操作は大きくても変速増大量は小さくなるため速度の急増大を防止して安全である(図14中一点鎖線)。また、逆に熟練度の高いオペレータで、変速レバー6を高速位置において走行させる機会が多いときは、低速走行時には変速レバー6の大きい揺動操作量yで所定角θのトラニオン軸7回転を得るようになし、一方高速走行時には変速レバー6の小さい揺動操作量x(<y)で所定角θのトラニオン軸7回転を得るように設定する。高速操作側を敏感に設定することで感度の良い操作感覚を得ることができる(同図中二点鎖線)。   Although the rotation angle of the trunnion shaft 7 with respect to the rotation operation amount of the shift lever 6 can be set to a predetermined value by configuring the shifter arm 63a with a different mounting angle with respect to the operation rotation input shaft 63, this fulcrum position Can be adjusted and set from the outside of the transmission case by attaching and detaching the support metal 63b, so that it is possible to adjust and set the operating feeling of the shift lever 6 and the rotation amount of the trunnion shaft 7, and the operator's favorite operating feeling can be set. Obtainable. For example, when the vehicle is traveling at a low speed, the trunnion shaft 7 rotation of a predetermined angle θ is obtained with a small swinging operation amount x of the speed change lever 6, while on the other hand, when the speed is high speed, a predetermined swinging operation amount y (> x) of the speed change lever 6 is predetermined. When the rotation of the trunnion shaft of the angle θ is set to obtain 7 rotations, even if the shift lever 6 swinging operation at high speed is large, the shift increase amount is small, so that a rapid increase in speed is prevented (one point in FIG. 14). Chain line). On the other hand, when there are many opportunities for the shift lever 6 to travel at a high speed position by a highly skilled operator, a trunnion shaft 7 rotation of a predetermined angle θ is obtained with a large swing operation amount y during low speed travel. On the other hand, when the vehicle is traveling at high speed, the rotation lever 7 is set so as to obtain 7 rotations of the trunnion shaft at a predetermined angle θ with a small swing operation amount x (<y). Sensitive operation feeling can be obtained by setting the high-speed operation side sensitively (two-dot chain line in the figure).

図16(D)は、連動プレート56とトラニオン軸操作アーム7aとの連結構成の改良に係り、操作アーム7a側から突設するピン部材7bを連動プレート56側において該プレート56の長手方向に形成する長孔56aに嵌合させて両者を連動させるよう構成している。このように構成することによって、連動プレート56の連繋機構に撓みやがたを生じていてもこれを吸収でき、トラニオン軸操作アーム7aに作用させる中立復帰機構7c(ばね、ボール等)に追随した中立位置を確保でき、不測に車体が動く恐れがない。   FIG. 16 (D) relates to an improvement in the connection configuration between the interlocking plate 56 and the trunnion shaft operating arm 7a, and a pin member 7b protruding from the operating arm 7a side is formed in the longitudinal direction of the plate 56 on the interlocking plate 56 side. The long holes 56a to be fitted are interlocked with each other. With this configuration, even if the linkage mechanism of the interlocking plate 56 is bent or rattled, this can be absorbed and the neutral return mechanism 7c (spring, ball, etc.) that acts on the trunnion shaft operating arm 7a is followed. A neutral position can be secured, and there is no danger of the body moving unexpectedly.

図17は、燃料給油タンク置き台の改良に関する。車体のフレーム部側面に横フレーム70aと縦フレーム70bとからなる支持フレーム70を着脱自在に固定し、該支持フレーム70の上部には、支点ピン71を水平姿勢に取り付けており、この支点ピン71に平面視矩形に形成した置き台72を該支点ピン71周りに上下に回動自在に取り付ける。そして、置き台72側に支持フック73を枢着し、先端部に形成する凹部73aを縦フレーム70b側に固定した支持ピン74に係脱可能に設けている。図 のように支持ピン74に支持フック73を係合させると置き台72は水平姿勢に保持でき、給油タンク75を載せて給油作業を行う。収納するときは、支持フック73を外し、該フック73を置き台72の適宜の内壁に沿わせる収納状態とする。なお符号76はこのフック73を収納状態に保持するマグネットである。また、前記支持フレーム70はミラー77の支持枠として利用できる。   FIG. 17 relates to an improvement of a fuel supply tank stand. A support frame 70 composed of a horizontal frame 70a and a vertical frame 70b is detachably fixed to the side of the frame portion of the vehicle body, and a fulcrum pin 71 is attached to the upper portion of the support frame 70 in a horizontal posture. A pedestal 72 formed in a rectangular shape in plan view is attached to the fulcrum pin 71 so as to be rotatable up and down. A support hook 73 is pivotally attached to the pedestal 72 side, and a recess 73a formed at the distal end is provided to be detachable from a support pin 74 fixed to the vertical frame 70b side. When the support hook 73 is engaged with the support pin 74 as shown in the figure, the cradle 72 can be held in a horizontal position, and the oil supply tank 75 is placed to perform the oil supply operation. When storing, the support hook 73 is removed, and the hook 73 is set in a storage state along an appropriate inner wall of the pedestal 72. Reference numeral 76 denotes a magnet for holding the hook 73 in a stored state. The support frame 70 can be used as a support frame for the mirror 77.

トラクタの全体側面図。The whole tractor side view. 各ミッションケースの側面図。Side view of each mission case. フェンダー上の各レバーの配置を示す平面図。The top view which shows arrangement | positioning of each lever on a fender. トラクタの伝動機構線図Tractor transmission mechanism diagram ミッションケースの正面図。The front view of a mission case. 油圧回路図。Hydraulic circuit diagram. ミッションケースの平面図。The top view of a mission case. 前後進を中立位置、変速位置を最低速位置としたレバー連動機構の斜視図。The perspective view of the lever interlocking mechanism which made the forward / backward movement the neutral position and made the gear shift position the lowest speed position. (A)前後進を後進位置、変速位置を最高速位置としたレバー連動機構の斜視図。(B)同じく平断面図。(A) The perspective view of the lever interlocking mechanism which made the forward / backward movement the reverse drive position and made the speed change position the highest speed position. (B) The same plane sectional view. (A)前後進を前進位置、変速位置を最低速位置としたレバー連動機構の側面図。(B)同じくレバー連動機構の正面図。(C)同じくレバー連動機構の平面図。(D)同じくレバー連動機構の斜視図。(E)同じくレバー連動機構の平断面図。(A) The side view of the lever interlocking mechanism which made the forward / rearward movement the forward position and the shift position the lowest speed position. (B) Front view of the lever interlocking mechanism. (C) The top view of a lever interlocking mechanism similarly. (D) The perspective view of a lever interlocking mechanism similarly. (E) The cross-sectional view of the lever interlocking mechanism. (A)前後進を後進位置、変速位置を最低速位置としたレバー連動機構の側面図。(B)同じくレバー連動機構の正面図。(C)同じくレバー連動機構の平面図。(D)同じくレバー連動機構の斜視図。(E)同じくレバー連動機構の平断面図。(A) The side view of the lever interlocking mechanism which made the forward / backward movement the reverse drive position and the speed change position the lowest speed position. (B) Front view of the lever interlocking mechanism. (C) The top view of a lever interlocking mechanism similarly. (D) The perspective view of a lever interlocking mechanism similarly. (E) The cross-sectional view of the lever interlocking mechanism. (A)前後進を中立位置、変速位置を最低速位置としたレバー連動機構の側面図。(B)前後進を中立位置、変速位置を最低速位置としたレバー連動機構の正面図。(C)前後進を中立位置、変速位置を最低速位置としたレバー連動機構の平面図。(A) The side view of the lever interlocking mechanism which made the forward / backward movement the neutral position and made the speed change position the lowest speed position. (B) The front view of the lever interlocking mechanism which made the forward / backward movement the neutral position and made the speed change position the lowest speed position. (C) The top view of the lever interlocking mechanism which made the forward / backward movement the neutral position and made the gear shift position the lowest speed position. 連動機構一部側面図。The interlocking mechanism partial side view. 操作回動入力軸角度−トラニオン軸角度関係グラフ。Operation rotation input shaft angle-trunnion shaft angle relationship graph. レバー連動機構の取付状態を示すミッションケースを破断した斜視図。The perspective view which fractured | ruptured the mission case which shows the attachment state of a lever interlocking mechanism. (A)一部異なる連動機構を示す正面図、(B)側面図、(C)平面図、(D)一部拡大平面図。(A) Front view showing partially different interlocking mechanisms, (B) side view, (C) plan view, (D) partially enlarged plan view. (A)燃料タンク置き台一例を示す正面図、(B)側面図、(C)平面図、(D)収納状態正面図。(A) The front view which shows an example of a fuel tank stand, (B) Side view, (C) Plan view, (D) The accommodation state front view.

符号の説明Explanation of symbols

E エンジン
L レバー連動機構(連動機構)
T トラクタ
1F 前輪
1R 後輪
3 HST
5 前後進切替レバー
6 変速レバー
7 トラニオン軸
7a トラニオン軸操作アーム(操作アーム)
12 伝動ケース
53p 第1係合ピン
54a 前後進切替アーム(連動アーム)
54p 第2係合ピン
55 回転台
63 操作回動入力軸
63a シフターアーム
E Engine L Lever interlocking mechanism (interlocking mechanism)
T tractor 1F front wheel 1R rear wheel 3 HST
5 Forward / reverse switching lever 6 Shift lever 7 Trunnion shaft 7a Trunnion shaft operation arm (operation arm)
12 Transmission case 53p First engagement pin 54a Forward / reverse switching arm (interlocking arm)
54p 2nd engagement pin 55 Turntable 63 Operation rotation input shaft 63a Shifter arm

Claims (3)

エンジン(E)の回転動力を走行装置(1F,1R)へ伝達する無段変速装置(3)と、該無段変速装置(3)と、該無段変速装置(3)の出力回転速度を変速操作する変速レバー(6)と、前後進切替レバー(5)の切換操作に基づいて前記変速レバー(6)の同一操作方向に対する無段変速装置(3)の出力回転方向を正転方向と逆転方向に切り替えることのできる連動機構(L)を設けたことを特徴とする作業車両における変速操作装置。   The continuously variable transmission (3) that transmits the rotational power of the engine (E) to the traveling devices (1F, 1R), the continuously variable transmission (3), and the output rotational speed of the continuously variable transmission (3) Based on the switching operation of the speed change lever (6) and the forward / reverse switching lever (5), the output rotation direction of the continuously variable transmission (3) with respect to the same operation direction of the speed change lever (6) is defined as the forward rotation direction. A speed change operation device for a work vehicle, characterized in that an interlocking mechanism (L) capable of switching in a reverse direction is provided. エンジン(E)の回転動力を走行装置(1F,1R)へ伝達する無段変速装置(3)と、該無段変速装置(3)と、該無段変速装置(3)の出力回転速度を変速操作する変速レバー(6)と、前後進切替レバー(5)の切換操作に基づいて前記変速レバー(6)の同一操作方向に対する無段変速装置(3)の出力回転方向を正転方向と逆転方向に切り替えることのできる連動機構(L)を設け、
連動機構(L)は、変速レバー(6)の変速操作量に対する無段変速装置(3)の出力回転数を略比例させるよう構成した作業車両における変速操作装置。
The continuously variable transmission (3) that transmits the rotational power of the engine (E) to the traveling devices (1F, 1R), the continuously variable transmission (3), and the output rotational speed of the continuously variable transmission (3) Based on the switching operation of the speed change lever (6) and the forward / reverse switching lever (5), the output rotation direction of the continuously variable transmission (3) with respect to the same operation direction of the speed change lever (6) is defined as the forward rotation direction. An interlocking mechanism (L) that can be switched in the reverse direction is provided.
The interlocking mechanism (L) is a speed change operation device in a work vehicle configured to make the output rotational speed of the continuously variable transmission (3) substantially proportional to the speed change operation amount of the speed change lever (6).
連動機構(L)は、第1係止溝(55b)とこの係止溝(55b)に係合する第1係合ピン(53p)及び第2係止溝(55a)とこの係止溝(55a)に係合する第2係合ピン(54p)とを備える回転台(55)と、該回転台(55)を縦軸(X)回りに回動可能に支持しかつ該回転台(55)を横方向に往復移動可能に支持する回転台支持筒(65)と、回転台(55)の往復移動に伴う前記第2係合ピン(54p)の変位を前記トラニオン軸(7)に伝達するトラニオン軸連動機構(54b,54,54a,56,7a)とを備え、
前記回転台支持筒(65)は前記変速レバー(6)の操作に連動して往復移動すべく構成し、
前記第1係合ピン(53p)を前後進切替レバー(5)の操作に連動して揺動させることにより回転台(55)を前記縦軸(X)回りに回動させてトラニオン軸(7)の回動可能範囲を前進域(F)から後進域(R)に、又は後進域(R)から前進域(F)に切替えるよう構成してなる請求項1または請求項2に記載の作業車両における変速操作装置。
The interlocking mechanism (L) includes a first engagement pin (53p) and a second engagement groove (55a) that engage with the first engagement groove (55b), the engagement groove (55b), and the engagement groove ( 55a) and a rotating base (55) provided with a second engaging pin (54p) that engages with the second engaging pin (54p), and supports the rotating base (55) so as to be rotatable about the vertical axis (X). ) And the displacement of the second engagement pin (54p) accompanying the reciprocating movement of the rotating table (55) to the trunnion shaft (7). Trunnion shaft interlocking mechanism (54b, 54, 54a, 56, 7a)
The turntable support cylinder (65) is configured to reciprocate in conjunction with the operation of the speed change lever (6),
By rotating the first engagement pin (53p) in conjunction with the operation of the forward / reverse switching lever (5), the turntable (55) is rotated about the vertical axis (X), thereby the trunnion shaft (7 3. The work according to claim 1 or 2, wherein the rotatable range is switched from the forward range (F) to the reverse range (R), or from the reverse range (R) to the forward range (F). A speed change operation device in a vehicle.
JP2006054183A 2006-02-28 2006-02-28 Speed change operation device for work vehicle Expired - Fee Related JP4826285B2 (en)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2003040135A (en) * 2001-07-27 2003-02-13 Seirei Ind Co Ltd Working vehicle
JP2004051001A (en) * 2002-07-22 2004-02-19 Seirei Ind Co Ltd Advance/backing changeover mechanism of vehicle and vehicle provided with it

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003040135A (en) * 2001-07-27 2003-02-13 Seirei Ind Co Ltd Working vehicle
JP2004051001A (en) * 2002-07-22 2004-02-19 Seirei Ind Co Ltd Advance/backing changeover mechanism of vehicle and vehicle provided with it

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