JPH01306325A - Four-wheel drive type working truck - Google Patents
Four-wheel drive type working truckInfo
- Publication number
- JPH01306325A JPH01306325A JP63134817A JP13481788A JPH01306325A JP H01306325 A JPH01306325 A JP H01306325A JP 63134817 A JP63134817 A JP 63134817A JP 13481788 A JP13481788 A JP 13481788A JP H01306325 A JPH01306325 A JP H01306325A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- front wheel
- drive
- speed
- switching operation
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims description 28
- 230000000694 effects Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Arrangement And Driving Of Transmission Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、操向繰作自在な前輪への伝動系に、後輪駆動
速度と略等しい駆動速度で伝動する標準駆動状態と、後
輪駆動速度より大きい駆動速度で伝動する増速駆動状態
とに切換可能な機械操作式の前輪変速装置を備えた四輪
駆動型作業車に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a transmission system for front wheels that can be freely steered, and a standard drive state in which power is transmitted at a drive speed approximately equal to the rear wheel drive speed; The present invention relates to a four-wheel drive type work vehicle equipped with a mechanically operated front wheel transmission that can be switched to an accelerated drive state in which transmission is performed at a drive speed higher than the drive speed.
四輪駆動型作業車の1つである農用トラクタにおいては
例えば実開昭62−137732号公報に開示されてい
るように、前輪操向用のピットマンアームと前輪変速装
置とを機械的に連動連結して、前輪を設定角度以上に操
向繰作すると前輪変速装置が増速駆動側に切換操作され
るように構成しているものがあり、これにより地面を特
に荒らすことなく比較的容易に急旋回が行えるようにな
っている。In agricultural tractors, which are one type of four-wheel drive working vehicle, a pitman arm for front wheel steering and a front wheel transmission are mechanically interlocked and connected, as disclosed in, for example, Japanese Utility Model Application Publication No. 137732/1983. Some models are configured so that when the front wheels are repeatedly steered beyond a set angle, the front wheel transmission is switched to the speed-increasing drive side. It is now possible to turn.
前述の構造であるとピットマンアームと前輪変速装置の
切換操作軸とがカム機構、揺動アーム及びワイヤを介し
て連動連結されている為、連係機構としての構造がどう
しても複雑になる傾向があり、改良の余地があった。In the above-mentioned structure, the pitman arm and the switching operation shaft of the front wheel transmission are interlocked and connected via a cam mechanism, a swing arm, and a wire, so the structure as a linkage mechanism tends to be complicated. There was room for improvement.
ここで本発明は前述の状況に着目して成されたものであ
り、前輪操向系と前輪変速装置との連係構造の簡素化を
図ることを目的としている。The present invention has been made with attention to the above-mentioned situation, and an object of the present invention is to simplify the linkage structure between the front wheel steering system and the front wheel transmission.
本発明は冒記したような四輪駆動型作業車において、前
輪の設定角度以上の操向操作により前輪変速装置が増速
駆動側に切換操作されるように、前輪変速装置の切換操
作軸と前輪操向用のピットマンアームの回動軸とを同芯
状に連結してあることにあり、その作用及び効果は次の
とおりである。In the four-wheel drive type work vehicle as mentioned above, the present invention has a switching operation shaft of the front wheel transmission so that the front wheel transmission is switched to the speed-increasing drive side by steering operation of the front wheels at a preset angle or more. The reason for this is that it is concentrically connected to the pivot shaft of the pitman arm for steering the front wheels, and its functions and effects are as follows.
前述のように、前輪操向用のピットマンアームを揺動操
作する回動軸と前輪変速装置の切換操作軸とを同芯状に
連結することによって、従来構造において必要であった
カム機構、揺動アーム及びワイヤ等を省略することがで
きるようになるのである。As mentioned above, by concentrically connecting the rotation shaft that swings the pitman arm for front wheel steering and the switching operation shaft of the front wheel transmission, the cam mechanism and swing that were necessary in the conventional structure are eliminated. This makes it possible to omit movable arms, wires, etc.
以上のように、前輪変速装置を装備した四輪駆動型作業
車において、前輪操向系であるピットマンアームと前輪
変速装置との連係構造の簡素化を図り、全体としてのコ
ストダウンを行うことができた。As described above, in a four-wheel drive work vehicle equipped with a front wheel transmission, it is possible to simplify the linkage structure between the pitman arm, which is the front wheel steering system, and the front wheel transmission, and reduce the overall cost. did it.
以下、本発明の実施例である四輪駆動型の農用トラクタ
について、図面に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A four-wheel drive agricultural tractor that is an embodiment of the present invention will be described below with reference to the drawings.
第3図に示すように、前輪(1)及び後輪(2)で支持
された機体の前部にエンジン(3)、機体の後部にクラ
ッチ(4)及びミッションケース(5)が搭載されて四
輪駆動型の農用トラクタが構成されている。エンジン(
3)からの動力はクラッチ(4)からミッションケース
(5)内の主変速装置及び副変速装置(以上図示せず)
に伝達され変速操作されて後輪(2)に伝達されると共
に、副変速装置から分岐した動力は前輸出力軸(6)か
ら機体前部の前輪変速装置(7)に伝達され、変速操作
されて前輪(1)に伝達されるのである。As shown in Figure 3, the engine (3) is mounted on the front of the aircraft supported by the front wheels (1) and rear wheels (2), and the clutch (4) and transmission case (5) are mounted on the rear of the aircraft. A four-wheel drive agricultural tractor is constructed. engine(
The power from 3) is transmitted from the clutch (4) to the main transmission and auxiliary transmission (not shown) in the transmission case (5).
At the same time, the power branched from the auxiliary transmission is transmitted from the front output power shaft (6) to the front wheel transmission (7) at the front of the aircraft, and the power is transmitted to the rear wheels (2) for gear shifting operation. and is transmitted to the front wheels (1).
前輪変速装置(7)は第2図に示すように、前輪(1)
への出力軸(8)に標準人力ギヤ(9)及び増速人力ギ
ヤ(10)が相対回転自在に外嵌されると共に、前輸出
力軸(6)からの動力を受は取る伝動軸(11)に固定
された標準出力ギヤ(12)及び増速出力ギヤ(13)
が標準入力ギヤ(9)と増速人力ギヤ(10)に咬み合
っている。そして、出力軸(8)にスプライン構造にて
スライド自在に取り付けられたシフト部材(14)を標
準人力ギヤ(9)に咬み合わせると、前後輪(1)、
(2)が略同速度で駆動される標準駆動状態で動力伝達
されるのである。逆に、増速入力ギヤ(10)と出力軸
(8)との間に構成された摩擦クラッチ(15)をシフ
ト部材(14)により押圧入り操作すると、前輪(1)
が後輪(2)よりも増速駆動される増速駆動状態で動力
伝達されて行くのである。As shown in Fig. 2, the front wheel transmission (7)
A standard manual gear (9) and a speed-increasing manual gear (10) are fitted onto the output shaft (8) so as to be relatively rotatable, and a transmission shaft ( Standard output gear (12) and speed-up output gear (13) fixed to 11)
meshes with the standard input gear (9) and the speed-up manual gear (10). When the shift member (14) slidably attached to the output shaft (8) with a spline structure is engaged with the standard manual gear (9), the front and rear wheels (1),
(2) is transmitted in a standard driving state in which the motors are driven at approximately the same speed. Conversely, when the friction clutch (15) configured between the speed increasing input gear (10) and the output shaft (8) is pressed into operation by the shift member (14), the front wheels (1)
Power is transmitted to the rear wheels (2) in an accelerated driving state in which the rear wheels (2) are driven at higher speeds.
次に、前記シフト部材(14)の操作系の構造について
詳述すると、第1図及び第2図に示すように前輪変速装
置(7)に対する切換操作機構が前輪変速装置(7)に
連結されており、その構造はシフト部材(14)に対す
るシフトフォーク(17)が軸芯方向に摺動自在な操作
軸(18)に融通用のバネ(19)を介して取り付けら
れると共に、ハネ(19)よりも付勢力の弱いバネ(2
0)によりシフトフォーク(17)が標準人力ギヤ(9
)咬合側に付勢されている。Next, the structure of the operation system of the shift member (14) will be described in detail. As shown in FIGS. 1 and 2, a switching operation mechanism for the front wheel transmission (7) is connected to the front wheel transmission (7). The structure is such that a shift fork (17) for a shift member (14) is attached to an operating shaft (18) that is slidable in the axial direction via a flexible spring (19), and a spring (19) A spring with a weaker biasing force than (2
0) allows the shift fork (17) to shift to the standard manual gear (9).
) is biased towards the occlusal side.
これに対して切換操作軸(21)が操作軸(18)に直
交するように配置されると共に、この切換操作軸<21
)にスプライン構造にて上下スライド自在にカム部材(
22)が取り付けられ、操作軸(18)の端部に取り付
けられたローラー(23)がカム部材(22)に接当し
ている。そして、この切換操作M(21)に前輪(1)
操向用のピットマンアーム(24)の回動軸(25)が
同芯状に連結されているのであり、操縦ハンドル(30
)と回動軸(25)とがステアリング軸(31)及び減
速機構(図示せず)を介して連結されているのである。On the other hand, the switching operation axis (21) is arranged perpendicular to the operation axis (18), and the switching operation axis <21
) has a spline structure that allows the cam member to slide up and down (
22) is attached, and a roller (23) attached to the end of the operating shaft (18) is in contact with the cam member (22). Then, this switching operation M (21) causes the front wheel (1) to
The rotation shaft (25) of the steering pitman arm (24) is concentrically connected to the steering handle (30).
) and the rotating shaft (25) are connected via a steering shaft (31) and a speed reduction mechanism (not shown).
以上の構造により、操縦ハンドル(30)を回動操作す
ると回動軸(25)と共に切換操作軸(21)及びカム
部材(22)も回動操作されて行くのであり、その操作
が設定角度以上になるとカム部材(22)により操作軸
(18)が第1図において左方に摺動操作されて行き、
シフト部材(14)が摩擦クラッチ(15)を押圧入り
操作して増速駆動状態が現出されるのである。With the above structure, when the operating handle (30) is rotated, the switching operation shaft (21) and the cam member (22) are also rotated together with the rotation shaft (25), and the operation is performed at a angle greater than or equal to the set angle. Then, the operating shaft (18) is slid to the left in FIG. 1 by the cam member (22).
The shift member (14) presses and operates the friction clutch (15) to bring about the speed-up drive state.
又、切換操作機構内の横軸芯(Pl)周りに回動自在に
切換軸(26)が支持されており、この切換軸(26)
から延出されたアーム(27)のピン(28)がカム部
材(22)の基部に係合している。この構造により、切
換軸(26)を回動操作しバネ(29)の付勢力に抗し
てカム部材(22)をローラー(23)から離れるまで
持ち上げると、前輪(1)の操向操作に関係なく、シフ
ト部材(14)を標準人力ギヤ(9)に咬み合わせたま
まの状態としておくことができるのである。Further, a switching shaft (26) is rotatably supported around a horizontal axis (Pl) in the switching operation mechanism, and this switching shaft (26)
A pin (28) of an arm (27) extending from the cam member (22) engages the base of the cam member (22). With this structure, when the switching shaft (26) is rotated and the cam member (22) is lifted up until it separates from the roller (23) against the urging force of the spring (29), the front wheel (1) can be steered. Regardless, the shift member (14) can remain engaged with the standard manual gear (9).
又、第3図に示すように本農用トラクタにはカゴ型のフ
レーム(32)が取り付けられており、このフレーム(
32)における前側のサイドフレーム(33)にバケ7
)(35)を備えたブーム(34)が上下揺動自在に取
り付けられている。そして、機体前部からサイドフレー
ム(33)に架設されている部0(36)は補強用のフ
レームである。Furthermore, as shown in Fig. 3, a cage-shaped frame (32) is attached to this agricultural tractor.
Attach the bucket 7 to the front side frame (33) in 32).
) (35) is attached to the boom (34) so as to be swingable up and down. The part 0 (36) installed from the front part of the fuselage to the side frame (33) is a reinforcing frame.
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.
図面は本発明に係る四輪駆動型作業車の実施例を示し、
第1図は前輪変速装置に対する切換操作系の縦断側面図
、第2図は前輪変速装置の縦断側面図、第3図は農用ト
ラクタの全体側面図である。
(1)・・・・・・前輪、(7)・・・・・・前輪変速
装置、(21)・・・・・・切換操作軸、(24)・・
・・・・ピットマンアーム、(25)・・・・・・回動
軸。The drawings show an embodiment of a four-wheel drive type work vehicle according to the present invention,
FIG. 1 is a longitudinal side view of a switching operation system for a front wheel transmission, FIG. 2 is a longitudinal side view of the front wheel transmission, and FIG. 3 is an overall side view of the agricultural tractor. (1)...Front wheels, (7)...Front wheel transmission, (21)...Switching operation shaft, (24)...
... Pitman arm, (25) ... Rotation axis.
Claims (1)
と略等しい駆動速度で伝動する標準駆動状態と、後輪駆
動速度より大きい駆動速度で伝動する増速駆動状態とに
切換可能な機械操作式の前輪変速装置(7)を備えた四
輪駆動型作業車であって、前輪(1)の設定角度以上の
操向操作により前輪変速装置(7)が増速駆動側に切換
操作されるように、前輪変速装置(7)の切換操作軸(
21)と前輪(1)操向用のピットマンアーム(24)
の回動軸(25)とを同芯状に連結してある四輪駆動型
作業車。The transmission system to the front wheels (1), which can be freely steered, is switched between a standard drive state in which power is transmitted at a drive speed approximately equal to the rear wheel drive speed, and an increased speed drive state in which power is transmitted at a drive speed greater than the rear wheel drive speed. This is a four-wheel drive work vehicle equipped with a mechanically operated front wheel transmission (7) that can shift the front wheel transmission (7) to the speed-increasing drive side by steering operation of the front wheels (1) beyond a set angle. The switching operation shaft (
21) and pitman arm (24) for steering the front wheels (1)
A four-wheel drive work vehicle in which the rotating shaft (25) of the four-wheel drive vehicle is concentrically connected.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63134817A JPH01306325A (en) | 1988-05-31 | 1988-05-31 | Four-wheel drive type working truck |
GB8907791A GB2220897B (en) | 1988-05-31 | 1989-04-06 | Four-wheel drive work vehicle |
CA000598950A CA1325602C (en) | 1988-05-31 | 1989-05-08 | Four-wheel drive work vehicle |
US07/350,615 US5038885A (en) | 1988-05-31 | 1989-05-11 | Four-wheel drive work vehicle |
KR1019890006577A KR920007840B1 (en) | 1988-05-31 | 1989-05-17 | Four-wheeled drive vehicle |
FR8907212A FR2631900B1 (en) | 1988-05-31 | 1989-05-31 | FOUR-WHEEL DRIVE WORK VEHICLE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63134817A JPH01306325A (en) | 1988-05-31 | 1988-05-31 | Four-wheel drive type working truck |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01306325A true JPH01306325A (en) | 1989-12-11 |
Family
ID=15137178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63134817A Pending JPH01306325A (en) | 1988-05-31 | 1988-05-31 | Four-wheel drive type working truck |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01306325A (en) |
-
1988
- 1988-05-31 JP JP63134817A patent/JPH01306325A/en active Pending
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