JPH04113074A - Running operation structure for working vehicle - Google Patents

Abstract

PURPOSE:To regularly expectably realize a smooth speed change operation with a relatively low cost by providing a contact part interfering with an engaging member in the pushing and drawing direction of a sliding body in accordance with the speed change operation of a continuously variable transmission system to high speed side. CONSTITUTION:The operation shaft 32 of a CVT is connected to a shift pedal 33 through a speed change rod 36, the operation shaft 34 of a forward/reverse switching system is connected to a switching lever 35 through a switching rod 37, and both the rods 36, 37 are provided in orthogonal state. A curved plate contact part 38 and a pair of engaging members 39, 39 are fixed to the speed change rod 36 and the switching rod 37, respectively, so that the contact part 38 is entered between the pair of engaging members 39, 39 in accordance with the speed change operation of the CVT to high speed side by the operation of the pedal 33, and the pair of the engaging members 39, 39 interfere with the contact part 38 in the axial direction of the switching rod 37, and the engagement between the contact part 38 and the engaging member 39, 39 is released in accordance with the speed change operation to low speed side. Namely, forward/reverse switching is made impossible in the high speed transmitting state of the CVT.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はローントラクタ、バインダー等の作業車に係り
、詳しくは走行用の無段変速機構とこれを変速操作する
変速具、および前後進切換機構とこれを切換操作する切
換具を夫々備えてある作業車の走行用操作構造に関する
。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to work vehicles such as lawn tractors and binders, and more specifically relates to a continuously variable transmission mechanism for traveling, a transmission device for changing the speed of the same, and a forward/reverse switching device. The present invention relates to a driving operation structure for a work vehicle, which is equipped with a mechanism and a switching tool for switching the mechanism.

〔従来の技術〕[Conventional technology]

この種の操作構造は、無段変速機構の変速レバーと前後
進切換機構の切換レバーとを各別に設けてあることによ
り、任意の走行速度を選択した状態で前後進の切換えが
できる便利なものである。すなわち、前後進の切換操作
のときに無段変速機構を最低速状態に設定しておく必要
がないので、−旦後進状態から再び前進状態に切換えて
も元の前進速度を維持できる利点があった。This type of operation structure is convenient because it has separate gear levers for the continuously variable transmission mechanism and switching levers for the forward/reverse switching mechanism, allowing you to switch between forward and backward travel while selecting a desired speed. It is. In other words, since there is no need to set the continuously variable transmission mechanism to the lowest speed state when switching between forward and reverse travel, there is an advantage that the original forward speed can be maintained even if the vehicle is switched from reverse to forward again. Ta.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

ところが、無段変速機構で選択された走行速度のままで
前後進を切換える場合に、その選択速度が高速状態であ
ると、切換ショックが大となって変速装置を痛めたり、
例えばローントラクタでは切換えに伴って駆動輪がスリ
ップして植芝を痛める等の不具合が生じる可能性かある
。However, when switching between forward and reverse while keeping the selected running speed in the continuously variable transmission mechanism, if the selected speed is high, the switching shock will be large and may damage the transmission.
For example, in the case of a lawn tractor, there is a possibility that the drive wheels may slip during switching, causing problems such as damaging the grass.

従って無段変速機構を一旦低速側あるいは中立にシフト
ダウンしてから前後進の切換を行うという具合に、高速
走行状態のままでは前後進の切換えを行わないようにす
るのか通常の使い方となっているか、うっかりして高速
のままで前後進の切換えを行ってしまうことがあった。Therefore, it is common practice to shift the continuously variable transmission mechanism down to a low speed or neutral position, and then switch between forward and reverse, so that it does not switch between forward and reverse while driving at high speeds. There were times when I accidentally switched between forward and backward while still driving at high speed.

本発明は無段変速機構が高速側に操作されている状態で
は前後進−の切換えができないようにして、上記不具合
の発生を防止することを目的とする。An object of the present invention is to prevent the occurrence of the above-mentioned problems by preventing switching between forward and backward travel when the continuously variable transmission mechanism is operated to the high speed side.

〔課題を解決するための手段〕[Means to solve the problem]

本発明は冒頭に記載した作業車の走行用操作構造におい
て、前記変速具で押引き操作される摺動具と、前記切換
具で押引き操作される摺動体とを互いに横切る状態に配
設し、該摺動体に係合部材を取付けるとともに、前記無
段変速機構が高速側に変速操作されるに伴って、前記係
合部材と前記摺動体の押引き方向で干渉する接当部を前
記摺動具に設けてあることを特徴構成とする。The present invention provides the operation structure for driving a work vehicle described at the beginning, in which a sliding tool that is pushed and pulled by the transmission tool and a sliding member that is pushed and pulled by the switching tool are arranged in a state that they cross each other. , an engaging member is attached to the sliding body, and as the continuously variable transmission mechanism is shifted to a high speed side, the abutment portion that interferes with the engaging member and the sliding body in the push/pull direction is attached to the sliding body. The characteristic configuration is that it is provided on a moving tool.

〔作　用〕[For production]

前記構成によると、摺動具と摺動体は無段変速機構か高
速側に変速操作されると係合部材と接当部が摺動体の押
引き方向で干渉する状態、つまり摺動体の押引き操作か
規制されるので、前進及び後進のそれぞれの場合におけ
る接当部材間に接当部を配置することにより、前進か選
択されている場合には後進側への、後進が選択されてい
る場合には前進側への係合部材の移動、すなわち、前後
進切換機構の切換操作か不能となるのである。According to the above configuration, when the sliding tool and the sliding body are operated by the continuously variable transmission mechanism to shift to a high speed side, the engaging member and the contact portion interfere in the pushing and pulling direction of the sliding body, that is, the sliding body is pushed and pulled. Since the operation is restricted, by arranging the contact part between the contact members in each case of forward movement and reverse movement, it is possible to move to the reverse side when forward movement is selected, and to the reverse side when reverse movement is selected. In this case, the engaging member cannot be moved forward, that is, the forward/reverse switching mechanism cannot be operated.

無段変速機構が低速側に変速操作されていると、係合部
材と接当部との干渉は生じないので前後進切換機構の切
換操作が可能である。When the continuously variable transmission mechanism is shifted to a low speed side, there is no interference between the engaging member and the abutment portion, so that the forward/reverse switching mechanism can be switched.

〔発明の効果〕〔Effect of the invention〕

従って、係合部材付きの摺動体と接当部付きの摺動具を
設けるだけの比較的簡単な構造によって、高速伝動状態
での前後進切換操作を機械的に不能にできたので、円滑
な変速操作が常に期待できる作業車の走行用操作構造を
比較的コスト安に実現できた。Therefore, by using a relatively simple structure that only includes a sliding body with an engaging member and a sliding tool with an abutting part, it is possible to mechanically disable the forward/reverse switching operation in a high-speed transmission state, thereby ensuring smooth operation. We were able to realize a driving operation structure for a work vehicle that allows constant gear shifting operation at a relatively low cost.

〔実施例〕〔Example〕

以下に、本発明による作業車の走行用操作構造をローン
トラクタに搭載した場合について説明する。Below, a case will be described in which the operation structure for driving a work vehicle according to the present invention is mounted on a lawn tractor.

第４図に前部に縦軸型のエンジン（１）を備え、中央部
に操縦部（２）を配置し、後部に伝動装置（Ａ）を搭載
した機体（３）を、前後輪（４）、　（５）で走行可能
に構成するとともに、機体下腹部にモーア（６）を吊設
したローントラクタか示されている。伝動装置（Ａ）と
モーア（６）とはいずれもベルト伝動機構（７）、　（
８）によってエンジン（１）の動力を入力するように構
成しである。Figure 4 shows a fuselage (3) equipped with a vertical engine (1) in the front, a control unit (2) in the center, and a transmission (A) in the rear. ), (5) shows a lawn tractor configured to be able to run and with a mower (6) suspended from the underbelly of the machine. Both the transmission device (A) and the mower (6) are belt transmission mechanisms (7), (
8) is configured to input the power of the engine (1).

次に、伝動装置（Ａ）について説明する。Next, the transmission device (A) will be explained.

第２図、第３図に示すように伝動装置（Ａ）は、ベルト
伝動機構（７）によってエンジン（１）動力を入力する
動力入力部（Ｂ）、入力された動力を無段に変速する摩
擦式無段変速機構（以下ＣＶＴと略称する）（Ｃ）、こ
のＣＶ　Ｔ　（Ｃ）通過後の走行用動力の回転方向を切
換可能な正逆転切換機構（Ｄ）、およびデフ機構（Ｅ）
等を備えて構成されている。As shown in FIGS. 2 and 3, the transmission device (A) includes a power input section (B) that inputs power to the engine (1) through a belt transmission mechanism (7), and a power input section (B) that continuously changes the speed of the input power. A friction-type continuously variable transmission mechanism (hereinafter abbreviated as CVT) (C), a forward/reverse switching mechanism (D) that can switch the rotational direction of driving power after passing through the CVT (C), and a differential mechanism (E)
It is configured with the following.

動力入力部（Ｂ）は、入カブーリ（９）を備えた縦軸（
１０）と、後述するＣ　Ｖ　Ｔ　（Ｃ）の入力回転体（
１１）とをベベルギヤ連動して構成され、入力回転体（
１１）の軸部（１２）を延設して伝動ケース（１３）外
へ突出し、ＰＴＯ軸（Ｆ）を構成しである。The power input section (B) has a vertical shaft (
10) and the input rotating body (
11) is configured by interlocking the input rotating body (
The shaft portion (12) of 11) is extended and protrudes outside the transmission case (13) to constitute a PTO shaft (F).

ＣＶＴ（Ｃ）　は、出力軸（１４）（７）周囲Ｇ１ｍ、
コノ出力軸（１４）と同心状に配設される入力回転体（
１１）によって前記出力軸（１４）の軸心を中心として
公転駆動される複数の自転可能なテーパコーン（１５）
を配備し、これらテーパコーン（１５）に接触して駆動
回転される出力回転体（１６）を前記出力軸（１４）に
取付けるとともに、それらテーパコーン（１５）に亘っ
て軸心方向にシフト可能な変速部材（１７）を設けて構
成されている。テーパコーン（１５）はカム機構（１８
）によって押圧付勢される出力回転体（１６）と押圧接
触し、その反力をディスク状のコーンサボー）（１９）
によって受けているとともに、前記入力回転体（１１）
に取付けられた外枠（２０）と、二の外枠（２０）に連
結された内枠（２１）とによってキャリア（２２）を形
成し、テーパコーン（１５）を支軸（２３）を介して自
転自在に支持しである。CVT (C) has output shaft (14) (7) circumference G1m,
The input rotating body (
11), a plurality of rotatable taper cones (15) are driven to revolve around the axis of the output shaft (14).
An output rotating body (16) which is driven and rotated in contact with these taper cones (15) is attached to the output shaft (14), and a speed change that can be shifted in the axial direction across the taper cones (15) is provided. It is configured by providing a member (17). The taper cone (15) has a cam mechanism (18
) is pressed into contact with the output rotating body (16) which is pressed and biased by the disc-shaped cone sabot (19).
and the input rotating body (11)
A carrier (22) is formed by an outer frame (20) attached to the second outer frame (20) and an inner frame (21) connected to the second outer frame (20), and the tapered cone (15) is supported via the spindle (23). It is supported so that it can rotate freely.

正逆転切換機構（Ｄ）は、前記出力軸（１４）と、一端
にブレーキ装置（２４）を備えた中間軸（２５）とに亘
って構成されている。すなわち、出力軸（１４）の駆動
ギヤ（２６）と駆動スプロケット（２７）、中間軸（２
５）の従動ギヤ（２８）と従動スプロケット（２９）、
およびチェーン（３０）によって正逆の回転方向を現出
し、シフト回転具（３１）によって中間軸（２５）の回
転方向を選択する。The forward/reverse switching mechanism (D) is configured to span the output shaft (14) and an intermediate shaft (25) provided with a brake device (24) at one end. That is, the drive gear (26) and drive sprocket (27) of the output shaft (14), the intermediate shaft (2
5) driven gear (28) and driven sprocket (29),
The chain (30) reveals forward and reverse rotation directions, and the shift rotary tool (31) selects the rotation direction of the intermediate shaft (25).

ＣＶＴ（Ｃ）＋；！、変速部材（１７）（７）操作軸（
３２）　ヲ変速ペダル（３３）で、前後進切換機構（Ｄ
）はシフト回転具（３１）の操作軸（３４）を切換レバ
ー（３５）で夫々各別に操作するようにしである。CVT(C)+;! , transmission member (17) (7) operation shaft (
32) Use the gear shift pedal (33) to switch between forward and backward switching mechanism (D
) is arranged so that the operating shafts (34) of the shift rotary tool (31) are individually operated by a switching lever (35).

第１図に示すように、ＣＶＴの操作軸（３２）と変速具
（Ｑ）としての変速ペダル（３３）とを変速ロッド（３
６）で連結するとともに、前後進切換機構の操作軸（３
４）と切換具（Ｇ）としての切換レバー（３５）とを切
換えロッド（３７）で連結してあり、これら両ロッド（
３６）、　（３７）を直交する状態に配設しである。前
記変速ロッド（３６）に折り曲げ板状の摺動具（Ｓ）と
しての接当部（３８）を、前記切換ロッド（３７）に摺
動体（Ｔ）としての一対の係合部材（３９）、　（３９
）を夫々固着してあり、ＣＶ　Ｔ　（Ｃ）かペダル（３
３）の踏み込みによる高速側への変速操作に伴って接当
部（３８）が一対の係合部材（３９）。As shown in FIG.
6), and the operation shaft (3) of the forward/reverse switching mechanism.
4) and a switching lever (35) as a switching tool (G) are connected by a switching rod (37).
36) and (37) are arranged in a perpendicular state. A contact portion (38) as a bent plate-shaped sliding tool (S) is provided on the speed change rod (36), a pair of engagement members (39) as a sliding member (T) are provided on the switching rod (37), (39
) are fixed respectively, and the CV T (C) or pedal (3
3), the abutting portion (38) is connected to the pair of engagement members (39) when the gear is shifted to the high speed side by depressing the gear.

（３９）間に入り込んで切換ロッド（３７）の軸方向で
一対の係合部材（３９）、　（３９）と接当部（３８）
とか干渉するとともに、低速側への変速操作に伴って、
これら接当部（３８）と係合部材（３９）、　（３９）
の係合が解除される状態に設定しである。(39) A pair of engaging members (39) that enter between the switching rod (37) in the axial direction, (39) and the contact portion (38)
In addition to interfering with
These contact portions (38) and engaging members (39), (39)
The setting is such that the engagement is released.

つまり、ＣＶ　Ｔ　（Ｃ）が高速伝動状態では前後進の
切換えを不能にするのである。In other words, when CV T (C) is in a high-speed transmission state, switching between forward and forward travel is disabled.

また、ブレーキペダル（４０）で回動操作されるブレー
キ支軸（４１）を変速ロンド（３６）と直交するように
配設してあり、ブレーキ支軸（４１）に板片（４２）を
固着するとともに、変速ロッド（３６）にボルト調節式
の接当具（４３）を固定してあり、ブレーキペダル（４
０）の踏み込みによる走行の制動時ニハ板片（４２）が
接当具（４３）を押しテＣＶ　Ｔ　（Ｃ）を中立に強制
操作するように連係しである。In addition, a brake shaft (41) which is rotatably operated by the brake pedal (40) is disposed so as to be orthogonal to the gear shift iron (36), and a plate piece (42) is fixed to the brake shaft (41). At the same time, a bolt-adjustable abutment (43) is fixed to the speed change rod (36), and the brake pedal (43) is fixed to the shift rod (36).
When braking the vehicle by pressing the brake pedal 0), the plate (42) presses the abutting tool (43) to forcibly operate the Tee CV T (C) to neutral.

〔別実施例〕[Another example]

第５図に示すように、変速レバー（４４）、切換レバー
（３５）に、変速ロッド（３６）、切換ロッド（３７）
に替えて摺動ロッド（４５）、押引きロッド（４６）を
夫々連動連結し、摺動ロッド（４５）の接当部（３８）
の孔（４７）を押引きロッド（４６）が横切るように配
設し、該押引きロッド（４６）に鼓状の係合部材（３９
）を固定して牽制機構（Ｋ）を構成しても良い。接当部
（３８）の孔（４７）を係合部材（３９）の通過できる
大孔部（４７ａ）と通過できない小孔部（４７ｂ）とか
ら形成してあり、ＣＶ　Ｔ　（Ｃ）が高速伝動状態では
押引きロッド（４６）が小孔部（４７ｂ）に位置してい
る。As shown in FIG. 5, the shift lever (44), the switching lever (35), the shifting rod (36), the switching rod (37)
Instead, the sliding rod (45) and push/pull rod (46) are interlocked and connected, respectively, and the contact portion (38) of the sliding rod (45) is
The push-pull rod (46) is arranged so as to cross the hole (47), and the push-pull rod (46) is provided with a drum-shaped engagement member (39).
) may be fixed to constitute the check mechanism (K). The hole (47) of the abutment part (38) is formed of a large hole (47a) through which the engaging member (39) can pass and a small hole (47b) through which the engaging member (39) cannot pass. In the transmission state, the push/pull rod (46) is located in the small hole (47b).

この場合、接当部（３８）は係合部材（３９）の両外側
および間の３箇所で摺動可能であり、ＣＶＴ（Ｃ）の変
速を前後進切換機構（Ｄ）が前進（Ｆ）、中立（Ｎ）、
後進（Ｒ）のときに行うことか可能である。In this case, the abutment part (38) is slidable at three locations on both outside sides of the engagement member (39) and between the engagement member (39), and the forward/reverse switching mechanism (D) changes the speed of the CVT (C) to the forward direction (F). , neutral (N),
It is possible to do this when driving in reverse (R).

ＣＶ　Ｔ　（Ｃ）に代えて静油圧式無段変速装置で無段
変速機構（Ｃ）を構成しても良い。The continuously variable transmission mechanism (C) may be configured with a hydrostatic continuously variable transmission device instead of the CV T (C).

尚、特許請求の範囲の項に図面との対照を便利にする為
に符号を記すが、該記入により本発明は添付図面の構造
に限定されるものではない。Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明に係る作業車の走行用操作構造の実施例を
示し、第１図は該構造の要部を示す図、第２図は伝動装
置の展開断面図、第３図は伝動装置の側面図、第４図は
ローントラクタの側面図、第５図は前記操作構造の要部
の別実施例を示す図である。 （３８）・・・・・・接当部、（３９）・・・・・・係
合部材、（Ｃ）・・・・・・無段変速機構、（Ｄ）・・
・・・・前後進切換機構、（Ｇ）・・・・・・切換具、
（Ｈ）・・・・・・変速具、（Ｓ）・・−・・・摺動具
、（Ｔ）・・・・・・摺動体。The drawings show an embodiment of the operation structure for driving a working vehicle according to the present invention, FIG. 1 is a diagram showing the main parts of the structure, FIG. 2 is an exploded sectional view of the transmission device, and FIG. 3 is a diagram of the transmission device. FIG. 4 is a side view of the lawn tractor, and FIG. 5 is a diagram showing another embodiment of the main part of the operating structure. (38)...Abutment part, (39)...Engagement member, (C)...Continuously variable transmission mechanism, (D)...
...Forward/forward switching mechanism, (G)...Switching tool,
(H)...Transmission tool, (S)...Sliding tool, (T)...Sliding body.

Claims (1)

【特許請求の範囲】[Claims] 走行用の無段変速機構（Ｃ）とこれを変速操作する変速
具（Ｈ）、および前後進切換機構（Ｄ）とこれを切換操
作する切換具（Ｇ）を夫々備えてある作業車の走行用操
作構造であって、前記変速具（Ｑ）で押引き操作される
摺動具（Ｓ）と、前記切換具（Ｇ）で押引き操作される
摺動体（Ｔ）とを互いに横切る状態に配設し、該摺動体
（Ｔ）に係合部材（３９）を取付けるとともに、前記無
段変速機構（Ｃ）が高速側に変速操作されるに伴って、
前記係合部材（３９）と前記摺動体（Ｔ）の押引き方向
で干渉する接当部（３８）を前記摺動具（Ｓ）に設けて
ある作業車の走行用操作構造。Traveling of a work vehicle equipped with a continuously variable transmission mechanism (C) for traveling, a transmission device (H) for changing the speed of the same, and a forward/reverse switching mechanism (D) and a switching device (G) for switching the same. an operating structure in which a sliding tool (S) that is pushed and pulled by the transmission tool (Q) and a sliding body (T) that is pushed and pulled by the switching tool (G) are placed in a state where they cross each other. and attaching the engaging member (39) to the sliding body (T), and as the continuously variable transmission mechanism (C) is operated to shift to a high speed side,
An operation structure for running a work vehicle, wherein the sliding tool (S) is provided with an abutting portion (38) that interferes with the engaging member (39) and the sliding body (T) in the pushing and pulling direction.