JPH0744505Y2 - Shifting structure of work vehicle - Google Patents
Shifting structure of work vehicleInfo
- Publication number
- JPH0744505Y2 JPH0744505Y2 JP1986023644U JP2364486U JPH0744505Y2 JP H0744505 Y2 JPH0744505 Y2 JP H0744505Y2 JP 1986023644 U JP1986023644 U JP 1986023644U JP 2364486 U JP2364486 U JP 2364486U JP H0744505 Y2 JPH0744505 Y2 JP H0744505Y2
- Authority
- JP
- Japan
- Prior art keywords
- front wheel
- arm
- swinging
- pitman arm
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Mechanical Control Devices (AREA)
- Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、エンジンからの動力を後輪の駆動速度よりも
高速側に変速操作して前輪に伝達可能な前輪変速装置を
備えた作業車において、前輪変速装置の変速操作構造に
関する。[Detailed Description of the Invention] [Industrial field of application] The present invention is a work vehicle equipped with a front wheel transmission device capable of transmitting power from an engine to a front wheel by performing a speed change operation to a speed higher than a driving speed of a rear wheel. In regard to the above, it relates to a shift operation structure of the front wheel transmission.
前述のような前輪変速装置を備えた作業車の一例が、実
開昭58-211923号公報に開示されている。An example of a work vehicle equipped with the front wheel transmission as described above is disclosed in Japanese Utility Model Laid-Open No. 58-211923.
この作業車では、前輪の操向操作用のピットマンアーム
と前輪変速装置の変速操作部とワイヤによって接続し
て、ピットマンアームが右操向側に揺動操作されても左
操向側に揺動操作されても、ワイヤがピットマンアーム
側に引き操作されて、前輪変速装置の変速操作部が高速
側に操作されるように構成している。In this work vehicle, the pitman arm for steering operation of the front wheels is connected to the gear shifting operation section of the front wheel transmission by a wire so that even if the pitman arm is rocked to the right steering side, it is rocked to the left steering side. Even if it is operated, the wire is pulled to the pitman arm side, and the gear shift operation unit of the front wheel transmission is operated to the high speed side.
前述の構造では、ピットマンアームが右及び左操向側の
どちらに揺動操作されても、ワイヤがピットマンアーム
側に引き操作されるように構成するために、ピットマン
アームの揺動方向とワイヤの引き方向とを略直交させ
て、ワイヤの向きを曲げる滑車をワイヤの途中に設けて
いる。In the above structure, the wire is pulled toward the pitman arm side regardless of whether the pitman arm is rocked to the right or left steering side. A pulley for bending the direction of the wire is provided in the middle of the wire so as to be substantially orthogonal to the pulling direction.
これにより、ピットマンアームが右及び左操向側に揺動
操作された際に、滑車によって向きを曲げられながら、
ワイヤがピットマンアーム側に引き操作されるので、こ
のときワイヤには本来の引き方向の力に加えて、この引
き方向とは異なる方向の無理な力が掛かることになり、
耐久性の面で改善の余地があった。As a result, when the pitman arm is rocked to the right and left steering sides, while being bent by the pulley,
Since the wire is pulled to the pitman arm side, at this time, in addition to the force in the original pulling direction, an unreasonable force in a direction different from this pulling direction is applied,
There was room for improvement in terms of durability.
本考案は前輪変速装置を装備した作業車の変速操作構造
において、前輪変速装置の変速操作部とピットマンアー
ムとを機械的に連係した場合、その連係部材に無理な力
が掛からないような構造を得ることを目的としている。The present invention relates to a gear shift operation structure of a work vehicle equipped with a front wheel transmission, and has a structure in which, when the gear shift operation portion of the front wheel transmission and the pitman arm are mechanically linked, an excessive force is not applied to the linking member. The purpose is to get.
本考案の特徴は以上のような作業車の変速操作構造にお
いて、次のように構成することにある。The feature of the present invention resides in the following structure in the gear shift operation structure of the work vehicle as described above.
操向自在な前輪にエンジンからの動力を、後輪の駆動速
度よりも高速側に変速操作して伝達可能な前輪変速装置
を備え、 前輪の操向操作用のピットマンアームから離れた位置の
一軸芯周りに揺動自在な揺動アームを備えて、揺動アー
ムの揺動方向に沿う方向に移動自在な連係部材を、揺動
アームと前輪変速装置の変速操作部とに亘って設けると
共に、 ピットマンアームと揺動アームとをカム機構を介して連
係し、このカム機構を、ピットマンアームにおける右操
向側及び左操向側の夫々の揺動操作が、揺動アームの同
一揺動方向での揺動運動として揺動アームに伝達される
ように構成して、ピットマンアームの設定量以上の揺動
操作に伴う連係部材の移動により前輪変速装置の変速操
作部を高速側に変速操作自在に構成してある。Equipped with a front wheel transmission that can transmit power from the engine to the steerable front wheels by shifting the speed to a speed higher than the driving speed of the rear wheels, and a single shaft located away from the pitman arm for steering operation of the front wheels. A linking member having a swingable swinging arm around the core and movable in a direction along the swinging direction of the swinging arm is provided between the swinging arm and the shift operation portion of the front wheel transmission, The pitman arm and the swinging arm are linked via a cam mechanism, and the swinging operation on the right steering side and the left steering side of the pitman arm is performed in the same swinging direction of the swinging arm. Is configured to be transmitted to the swing arm as a swing motion of the front wheel transmission, and the shift operation portion of the front wheel transmission can be freely shifted to the high speed side by the movement of the linking member accompanying the swing operation over the set amount of the pitman arm. Configured.
本考案のように構成すると例えば第1図及び第2図に示
すように、ピットマンアーム(18)の右操向側に揺動操
作しても左操向側に揺動操作しても、カム機構(19)の
作用により揺動アーム(20)が同方向に揺動操作され
る。これにより、連係部材(21)が揺動アーム(20)の
揺動方向に沿って移動操作され、前輪変速装置(10)の
変速操作部(10a)が高速側に操作される。With the structure of the present invention, as shown in FIGS. 1 and 2, for example, when the pitman arm (18) is oscillated to the right steering side or the left steering side, the cam is operated. The swing arm (20) is swing-operated in the same direction by the action of the mechanism (19). As a result, the linking member (21) is moved along the swinging direction of the swinging arm (20), and the shift operating portion (10a) of the front wheel transmission (10) is operated to the high speed side.
この場合、従来の構造のように揺動アーム(20)の揺動
方向と連係部材(21)の移動方向とが略直交するのでは
なく、本考案では揺動アーム(20)の揺動方向と連係部
材(21)の移動方向とが略一致している。これにより、
連係部材(21)が滑車等によって向きを曲げられながら
移動操作されるようなことがなく、本来の移動方向の力
のみが連係部材(21)に掛かることになる。In this case, the swinging direction of the swinging arm (20) and the moving direction of the linking member (21) are not substantially orthogonal to each other as in the conventional structure, but in the present invention, the swinging direction of the swinging arm (20) is not. And the moving direction of the linking member (21) substantially coincide with each other. This allows
The linkage member (21) is not moved while being bent by a pulley or the like, and only the force in the original movement direction is applied to the linkage member (21).
以上のように、前輪変速装置を装備した作業車の変速操
作構造において、前輪変速装置の変速操作部とピットマ
ンアームとを機械的に連係する連係部材が、向きを曲げ
られることなく移動方向に沿う本来の方向にのみ移動操
作されるので、この連係部材に無理な力が掛からなくな
り、作業車の変速操作構造における耐久性の向上を図る
ことができた。As described above, in the gear shift operation structure of the work vehicle equipped with the front wheel transmission, the linking member that mechanically links the gear shift operation portion of the front wheel transmission and the pitman arm is along the moving direction without being bent. Since the moving operation is performed only in the original direction, an unreasonable force is not applied to the link member, and the durability of the gear shift operation structure of the work vehicle can be improved.
以下、本考案の実施例を作業車の一例である農用トラク
タにより図面に基づいて説明する。An embodiment of the present invention will be described below with reference to the drawings using an agricultural tractor which is an example of a work vehicle.
第4図に示すように、左右一対の操向型の前輪(1)及
び後輪(2)を各々駆動自在に支持した機体フレーム
(3)にエンジン(4)、主クラッチ(5)、ミッショ
ンケース(6)及び操縦部(7)を搭載し、機体後部に
ロータリ耕耘装置等の各種の作業装置を昇降自在に連結
するための上下に揺動駆動自在なリフトアーム(8)、
及び作業装置に動力を伝達するPTO軸(9)を設けて4
輪駆動型の農用トラクタを構成している。As shown in FIG. 4, an engine (4), a main clutch (5), and a mission are mounted on a body frame (3) that rotatably supports a pair of left and right steering type front wheels (1) and rear wheels (2). A lift arm (8) having a case (6) and a control unit (7) and capable of swinging up and down for connecting various working devices such as a rotary cultivator to a rear part of the machine body in a vertically swingable manner,
And PTO shaft (9) that transmits power to the work equipment
It constitutes a wheel drive type agricultural tractor.
次に、農用トラクタの動力伝達系統について説明する。
第4図に示すように、エンジン(4)からの動力は主ク
ラッチ(5)及び動力伝達軸(11)を介して、ミッショ
ンケース(6)内の主変速装置(図示せず)及び副変速
装置(図示せず)に伝達され、変速操作されて後輪
(2)を駆動し、副変速装置から分岐した動力は前輪変
速装置(10)及び前輪出力軸(15)を介して、前輪デフ
機構(1a)に送られて前輪(1)を駆動する。Next, the power transmission system of the agricultural tractor will be described.
As shown in FIG. 4, the power from the engine (4) passes through the main clutch (5) and the power transmission shaft (11), and the main transmission (not shown) and the sub-transmission in the transmission case (6). The power transmitted to a device (not shown) is operated to shift the rear wheels (2), and the power branched from the auxiliary transmission is transmitted to the front wheel differential through the front wheel transmission (10) and the front wheel output shaft (15). It is sent to the mechanism (1a) to drive the front wheels (1).
前輪変速装置(10)は副変速装置から分岐した動力を前
輪(1)が後輪(2)の駆動速度と略等しい速度で駆動
される標準駆動状態(A)と、前輪(1)が後輪(2)
の駆動速度よりも高速で駆動される増速駆動状態(B)
とに変速操作して、前輪(1)に伝達するように構成さ
れている。The front wheel transmission (10) operates in a standard drive state (A) in which the power branched from the auxiliary transmission is driven at a speed at which the front wheel (1) is substantially equal to the drive speed of the rear wheel (2), and the front wheel (1) is at the rear. Ring (2)
Driving speed that is driven at a higher speed than the driving speed of (B)
It is configured such that the gear is operated to be transmitted to the front wheel (1).
次に、前輪(1)の操向操作系について説明する。第1
図及び第3図に示すように、ステアリングハンドル(1
2)の回動操作力がステアリング軸(13)、ベベルギヤ
機構(14)及びジョイント軸(16)を介してステアリン
グギヤ機構(17)に伝達され、このステアリングギヤ機
構(17)で倍加されて、タイロッド(23)により前輪
(1)のナックルアーム(24)と連結されたピットマン
アーム(18)を、縦軸芯(P1)周りに揺動操作する。Next, the steering operation system of the front wheel (1) will be described. First
As shown in FIGS. 3 and 4, the steering wheel (1
The rotation operation force of 2) is transmitted to the steering gear mechanism (17) via the steering shaft (13), the bevel gear mechanism (14) and the joint shaft (16), and is doubled by the steering gear mechanism (17). A pitman arm (18) connected to the knuckle arm (24) of the front wheel (1) by a tie rod (23) is rocked around a vertical axis (P 1 ).
次に、ピットマンアーム(18)と前輪変速操作(10)の
連動構造について説明する。第1図に示すように、ピッ
トマンアーム(18)にカム板(19)(カム機構に相定)
を固設して、ピットマンアーム(18)の横側方に縦方向
の軸芯(P2)(一軸芯に相当)周りに揺動アーム(20)
を揺動自在に支持し、揺動アーム(20)の中央から下方
に突出させたピン(20a)を、カム板(19)に開孔した
カム穴(19a)に係入している。揺動アーム(20)の揺
動方向に沿って引き操作されるレリーズワイヤ(21)
(連係部材に相当)を、揺動アーム(20)の揺動端と、
前輪変速装置(10)の変速レバー(10a)(変速操作部
に相当)とに亘って架設連結している。Next, the interlocking structure of the pitman arm (18) and the front wheel shift operation (10) will be described. As shown in FIG. 1, the pitman arm (18) has a cam plate (19) (composed to the cam mechanism).
, And swing arm (20) around the vertical axis (P 2 ) (equivalent to a single axis) on the lateral side of the pitman arm (18).
A pin (20a), which is swingably supported and which projects downward from the center of the swing arm (20), is engaged in a cam hole (19a) formed in the cam plate (19). A release wire (21) that is pulled along the swing direction of the swing arm (20).
(Corresponding to the link member) with the swing end of the swing arm (20),
The front wheel transmission (10) is erected and connected across a speed change lever (10a) (corresponding to a speed change operation unit).
これにより、ピットマンアーム(18)が右及び左操向側
の(C)位置まで揺動操作されても揺動アーム(20)は
揺動操作されない。第2図に示すように右及び左操向側
の(C)位置を越えてピットマンアーム(18)が揺動操
作されると、カム板(19)のカム穴(19a)と揺動アー
ム(20)のピン(20a)とのカム作用によって、揺動ア
ーム(20)がレリーズワイヤ(21)の引き側に揺動操作
されて、これに連動して前輪変速装置(10)の変速レバ
ー(10a)が増速駆動状態(B)側に操作される。変速
レバー(10a)に設けたバネ(22)は、変速レバー(10
a)を標準駆動状態(A)側に付勢するものである。As a result, even if the pitman arm (18) is rocked to the right and left steering side (C) positions, the rocking arm (20) is not rocked. As shown in FIG. 2, when the pitman arm (18) is operated to swing beyond the positions (C) on the right and left steering sides, the cam hole (19a) of the cam plate (19) and the swing arm ( The rocking arm (20) is rocked to the pull side of the release wire (21) by the cam action of the pin (20a) of the gear wheel (20), and in conjunction with this, the gear shift lever (10) of the front wheel transmission (10). 10a) is operated to the speed-up drive state (B) side. The spring (22) provided on the speed change lever (10a) is
A) is biased toward the standard drive state (A).
前述の実施例では、標準及び増速駆動状態(A),
(B)の2段変速式の前輪変速装置(10)及びカム機構
を備えたが、無段変速式の前輪変速装置(図示せず)
と、ピットマンアーム(18)の揺動操作に比例して連続
的にレリーズワイヤ(21)を引き操作するカム機構を備
えてもよい。In the above-described embodiment, the standard and speed-up drive states (A),
(B) is equipped with a two-speed front wheel transmission (10) and a cam mechanism, but is a continuously variable front wheel transmission (not shown).
And a cam mechanism for continuously pulling and operating the release wire (21) in proportion to the swinging operation of the pitman arm (18).
又、本考案において、ある一定速度以上の高速ではカム
穴(19a)の形状を円弧状に変更して、増速駆動状態
(B)への変速作用を解除する機構を組み合わせてもよ
い。Further, in the present invention, at a high speed of a certain speed or higher, the shape of the cam hole (19a) may be changed to an arc shape so as to combine a mechanism for canceling the shifting action to the speed-up drive state (B).
図面は本考案に係る作業車の変速操作構造の実施例を示
し、第1図はピットマンアームと前輪変速装置との連係
状態を示す図、第2図はピットマンアームが右及び左操
向側に揺動操作された状態を示す平面図、第3図はステ
アリングハンドルからピットマンアームに至る操向操作
系の側面図、第4図は農用トラクタの全体側面図であ
る。 (1)……前輪、(2)……後輪、(4)……エンジ
ン、(10)……前輪変速装置、(10a)……変速操作
部、(18)……ピットマンアーム、(19)……カム機
構、(20)……揺動アーム、(21)……連係機構、
(P2)……一軸芯。FIG. 1 shows an embodiment of a gear shift operation structure for a work vehicle according to the present invention. FIG. 1 shows a state in which a pitman arm and a front wheel transmission are linked, and FIG. 2 shows a pitman arm on the right and left steering sides. FIG. 3 is a plan view showing a swinging operation state, FIG. 3 is a side view of a steering operation system from a steering handle to a pitman arm, and FIG. 4 is an overall side view of an agricultural tractor. (1) ... front wheel, (2) ... rear wheel, (4) ... engine, (10) ... front wheel transmission, (10a) ... speed change operation part, (18) ... pitman arm, (19 ) …… Cam mechanism, (20) …… Swing arm, (21) …… Coupling mechanism,
(P 2 ) ... Uniaxial core.
Claims (1)
らの動力を、後輪(2)の駆動速度よりも高速側に変速
操作して伝達可能な前輪変速装置(10)を備え、 前輪(1)の操向操作用のピットマンアーム(18)から
離れた位置の一軸芯(P2)周りに揺動自在な揺動アーム
(20)を備えて、前記揺動アーム(20)の揺動方向に沿
う方向に移動自在な連係部材(21)を、前記揺動アーム
(20)と前記前輪変速装置(10)の変速操作部(10a)
とに亘って設けると共に、 前記ピットマンアーム(18)と前記揺動アーム(20)と
をカム機構(19)を介して連係し、このカム機構(19)
を、前記ピットマンアーム(18)における右操向側及び
左操向側の夫々の揺動操作が、前記揺動アーム(20)の
同一揺動方向での揺動運動として前記揺動アーム(20)
に伝達されるように構成し、前記ピットマンアーム(1
8)の設定量以上の揺動操作に伴う前記連係部材(21)
の移動により前記前輪変速装置(10)の変速操作部(10
a)を高速側に変速操作自在に構成してある作業車の変
速操作構造。1. A front wheel transmission (10) capable of transmitting power from an engine (4) to a steerable front wheel (1) by performing a speed change operation to a speed higher than a driving speed of a rear wheel (2). The swing arm (20) is equipped with a swing arm (20) swingable around a uniaxial core (P 2 ) located away from the pitman arm (18) for steering operation of the front wheel (1). ), A linking member (21) movable in a direction along the swinging direction is provided to the swinging arm (20) and the shift operation section (10a) of the front wheel transmission (10).
And the pitman arm (18) and the swing arm (20) are linked via a cam mechanism (19), and the cam mechanism (19)
The swinging operations on the right steering side and the left steering side of the pitman arm (18) are the swinging movements of the swinging arm (20) in the same swinging direction. )
The pitman arm (1
The linking member (21) associated with the rocking operation above the set amount in 8).
Movement of the front wheel transmission (10) causes a shift operation portion (10
(a) is a gear shift operation structure of a work vehicle that is configured to be able to shift gears to the high speed side.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986023644U JPH0744505Y2 (en) | 1986-02-19 | 1986-02-19 | Shifting structure of work vehicle |
| GB08609138A GB2181395B (en) | 1985-10-12 | 1986-04-15 | Wheel drive mode changeover apparatus |
| US06/853,715 US4723622A (en) | 1985-10-12 | 1986-04-18 | Wheel drive mode changeover apparatus |
| FR868606932A FR2588517B1 (en) | 1985-10-12 | 1986-05-14 | TRACTION MODE CHANGE APPARATUS FOR TRACTOR |
| CA000510941A CA1271427A (en) | 1985-10-12 | 1986-06-05 | Wheel drive mode changeover apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986023644U JPH0744505Y2 (en) | 1986-02-19 | 1986-02-19 | Shifting structure of work vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62137732U JPS62137732U (en) | 1987-08-31 |
| JPH0744505Y2 true JPH0744505Y2 (en) | 1995-10-11 |
Family
ID=30822137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986023644U Expired - Lifetime JPH0744505Y2 (en) | 1985-10-12 | 1986-02-19 | Shifting structure of work vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0744505Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58211923A (en) * | 1982-06-04 | 1983-12-09 | Kubota Ltd | Front wheel speed control device for four-wheel drive vehicles |
-
1986
- 1986-02-19 JP JP1986023644U patent/JPH0744505Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62137732U (en) | 1987-08-31 |
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