JPH01218922A - Work truck - Google Patents
Work truckInfo
- Publication number
- JPH01218922A JPH01218922A JP4549688A JP4549688A JPH01218922A JP H01218922 A JPH01218922 A JP H01218922A JP 4549688 A JP4549688 A JP 4549688A JP 4549688 A JP4549688 A JP 4549688A JP H01218922 A JPH01218922 A JP H01218922A
- Authority
- JP
- Japan
- Prior art keywords
- front wheel
- transmission
- speed
- drive state
- mode
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 46
- 230000000452 restraining effect Effects 0.000 abstract description 2
- 230000001133 acceleration Effects 0.000 abstract 3
- 239000002184 metal Substances 0.000 abstract 2
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000000149 penetrating 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、前輪の回転速度を後輪の回転速度に対して高
速に設定する増速駆動状態と、前後輪の回転速度を略同
速に設定する標準駆動状態とに切換可能な前輪変速装置
を設けるとともに、前輪の左右操向角が設定角度以上に
なると前記前輪変速装置を増速駆動状態に切換えるべく
構成してある作業車に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an increased speed drive state in which the rotational speed of the front wheels is set higher than that of the rear wheels, and a state in which the rotational speeds of the front and rear wheels are set at approximately the same speed. The present invention relates to a work vehicle provided with a front wheel transmission capable of switching between a standard drive state and a standard drive state, and configured to switch the front wheel transmission to an increased speed drive state when the left and right steering angle of the front wheels exceeds the set angle.
この種の作業車では、例えば傾斜地で機体を急旋回させ
ると機体に強い遠心力が作用して転倒の危険があるため
、このような条件のもとでは前輪変速装置と操向装置と
を連係する切換え機構が作動しないようにしておく必要
がある。In this type of work vehicle, for example, if the machine makes a sharp turn on a slope, a strong centrifugal force acts on the machine and there is a risk of it falling over. Under such conditions, the front wheel transmission and steering system must be linked. It is necessary to prevent the switching mechanism from operating.
そのため従来の作業車では、実開昭62−178226
号公報に開示されているように前記切換え機構を操作す
るモード選択レバーを設けて、このレバーを手動操作す
ることによって前輪変速装置の増速駆動状態への切換え
が可能なモードと不能なモードとに選択できるようにし
てあった。Therefore, with conventional work vehicles,
As disclosed in the above publication, a mode selection lever for operating the switching mechanism is provided, and by manually operating this lever, there is a mode in which the front wheel transmission can be switched to an accelerating drive state and a mode in which it is not possible. It was possible to select from.
上記の如く構成されている作業車では、前記モード選択
レバーを、操作した位置に自己保持できるようにしてあ
るために、レバーをどちらに操作してあるのかの確認を
怠り易くて、前輪変速装置の増速状態への切換えが可能
なモードにあるまま傾斜地で機体を急旋回させてしまう
おそれがあり、改善を望まれていた。In a work vehicle configured as described above, the mode selection lever is configured to self-hold in the operated position, so it is easy to forget to check which direction the lever is operated, and the front wheel transmission There was a risk that the aircraft would make a sharp turn on a slope while in a mode that allows switching to an increased speed state, and an improvement was desired.
本発明はこのような実情に着目して、創案されたもので
、傾斜・地で機体を急旋回させた際に前輪変速機構が増
速駆動状態に切換わらないようにすることによって、操
作上の誤りによって生じる危険を未然に回避することを
目的としている。The present invention has been devised in view of these circumstances, and improves operational efficiency by preventing the front wheel transmission mechanism from switching to the accelerating drive state when the aircraft makes a sudden turn on a slope or on the ground. The purpose is to avoid the dangers caused by mistakes.
本発明の特徴構成は、機体の傾斜を検出する傾斜センサ
ーを設け、この傾斜センサーが設定角以上の機体の傾き
を検出すると、前記前輪変速装置の増速駆動状態への切
換えを不能にする前輪増速牽制手段を設けてある点にあ
り、その作用・効果は次の通りである。The characteristic configuration of the present invention is that a tilt sensor is provided for detecting the tilt of the aircraft body, and when the tilt sensor detects a tilt of the aircraft body that is equal to or greater than a set angle, the front wheel transmission is disabled to switch to the speed-up drive state of the front wheel transmission. A speed increase check means is provided, and its functions and effects are as follows.
つまり、作業車が傾斜地に位置して機体が傾斜すると、
傾斜角センサーがその傾きを検出してそれが設定角以上
であれば、前輪増速牽制手段が前輪変速機構の増速駆動
状態への切換えを自動的に不能にするのである。In other words, if the work vehicle is located on a slope and the machine body is tilted,
The inclination angle sensor detects the inclination, and if the inclination is equal to or greater than the set angle, the front wheel speed increase check means automatically disables the front wheel speed change mechanism from switching to the speed increase drive state.
従って、傾斜地で機体を急旋回させる際に増速状態への
切換えが可能なモードに前輪変速装置への選択がなされ
ていても、増速駆動状態に切換わることはなくなり、安
全に旋回できるようになった。Therefore, even if the front wheel transmission is selected in a mode that allows switching to an increased speed state when the aircraft makes a sharp turn on a slope, it will no longer switch to an increased speed drive state, making it possible to turn safely. Became.
第7図に示すように、左右一対の操向自在な前車輪(1
)を駆動可能に有し、かつ、左右一対の非操向型の後車
輪(2)を駆動可能に有した走行機体の後部に、ローク
リ耕耘装置等の各種作業装置を昇降操作自在に連結する
リフトアーム(3)、及び、連結作業装置に伝動する動
力取出し軸(4)を備えて、作業車の一例である農用ト
ラクターを構成してある。As shown in Figure 7, a pair of left and right front wheels (1
), and a pair of left and right non-steering type rear wheels (2) that are drivable, and various working devices such as a row tiller are connected to the rear of the vehicle so that they can be raised and lowered. An agricultural tractor, which is an example of a working vehicle, includes a lift arm (3) and a power take-off shaft (4) that transmits power to a connected working device.
前車輪(1)の操向操作を可能にするに、第5図及び第
6図に示すように、ハンドル(5)に回転軸(6)、ギ
ア伝動機構(7)及び回転軸(8)を介してステアリン
グギア機構(9)を連動させると共に、このステアリン
グ機構(9)に軸芯(Pl)周りで揺動するように付設
してあるピットマンアーム(11)をタイロッド(12
)を介して一対の前車輪(1)夫々のナックルアーム(
13)に連動させてあり、ハンドル(5)を回転操作す
ることにより、この操作力が伝達されて一対の前車輪(
1)夫々が軸芯(P2)周りで揺動するように一対の前
車輪(1)とハンドル(5)とを連動させである。To enable steering operation of the front wheel (1), as shown in FIGS. 5 and 6, the handle (5) is equipped with a rotating shaft (6), a gear transmission mechanism (7), and a rotating shaft (8). The steering gear mechanism (9) is interlocked via the steering gear mechanism (9), and the pitman arm (11) attached to the steering mechanism (9) so as to swing around the axis (Pl) is connected to the tie rod (12).
) through the pair of front wheels (1) each knuckle arm (
13), and by rotating the handle (5), this operating force is transmitted to the front wheels (5).
1) A pair of front wheels (1) and a handle (5) are interlocked so that each swings around an axis (P2).
前記走行機体の後部を形成するミッションケース(14
)の前端部に、前車輪(1)に対する変速装置(15)
を内装してあり、この変速装置(15)は、第1図及び
第4図に示すように構成してある。A mission case (14) forming the rear part of the traveling aircraft
), a transmission (15) for the front wheel (1) is installed at the front end of the
This transmission (15) is constructed as shown in FIGS. 1 and 4.
すなわち、走行用トランスミッション(図示せず)の前
輪用出力ギア(16)にギア(17)を介して連動する
クラッチ爪部(18a)付きの標準速伝動ギア(18)
と、前記ギア(17)に回転軸(19)及びギア(20
)を介して連動する多板式摩擦クラッチ(21)付の増
速伝動ギア(22)とを出力軸(23)に相対回転可能
に取付け、前記出力軸(23)にスプライン外嵌したス
リーブ(24)に一体回転及び摺動可能な伝動兼用の変
速部材(25)を取付けである。That is, a standard speed transmission gear (18) with a clutch pawl (18a) interlocked with a front wheel output gear (16) of a driving transmission (not shown) via a gear (17).
and a rotating shaft (19) and a gear (20) to the gear (17).
) is attached to the output shaft (23) so as to be able to rotate relative to the speed increasing transmission gear (22) with a multi-disc friction clutch (21), and a sleeve (24) fitted externally with splines is attached to the output shaft (23). ) is attached with a transmission member (25) that can rotate and slide integrally and also serves as a transmission.
そして、前記変速部材 (25)を摺動操作するための
シフター(26)が支軸(27)を介して摺動自在にミ
ッションケース(14)に取付けられ、前記シフター(
26)を第1操作位置(S)に操作すると、変速部材(
25)が前記クラッチ爪部(18a)に係脱可能なりラ
ッチ爪部(25a)を介して標準速伝動ギア(18)に
一体回転可能に係合し、一対の前車輪(1)の平均周速
度と一対の後車輪(2)の平均周速度とを同一またはほ
ぼ同一にするように前輪用差動機構(28)に伝動する
標準四輪駆動状態になり、シフター(26)を第2操作
位置(N)に操作すると、変速部材(25)が標準速伝
動ギア(18)から離脱すると共に摩擦クラッチ(21
)に対する非押圧作用の状態になり、一対の後車輪(2
)のみが駆動されて一対の前車輪(1)が遊転状態にな
るように前車輪(1)に対する伝動を断つ二輪駆動状態
になり、又、シフター(26)を第3操作位置(H)に
操作すると、変速部材(25)が操作部(25b)によ
り摩擦クラッチ(21)を入り操作して増速伝動ギア(
22)と一体回転する状態になり、一対の前車輪(1)
の平均周速度を一対の後車輪(2)の平均周速度より大
にするように前輪用差動機構(28)に伝動する増速駆
動状態になるようにしてある。つまり、シフター(26
)の操作に連動した変速部材(25)の摺動操作により
、前記した3種の状態に二輪駆動状態を中心に切換わる
ようにしてある。A shifter (26) for slidingly operating the transmission member (25) is slidably attached to the transmission case (14) via a support shaft (27), and the shifter (26) is slidably attached to the transmission case (14) via a support shaft (27).
26) to the first operating position (S), the transmission member (
25) is capable of engaging and disengaging from the clutch pawl (18a) and is integrally rotatably engaged with the standard speed transmission gear (18) via the latch pawl (25a), so that the average circumference of the pair of front wheels (1) is The standard four-wheel drive state is established in which transmission is made to the front wheel differential mechanism (28) so that the speed and the average circumferential speed of the pair of rear wheels (2) are the same or almost the same, and the shifter (26) is operated in the second operation. When operated to position (N), the transmission member (25) disengages from the standard speed transmission gear (18) and also engages the friction clutch (21).
), and the pair of rear wheels (2
) is driven and the pair of front wheels (1) are in an idle state, resulting in a two-wheel drive state in which transmission to the front wheels (1) is cut off, and the shifter (26) is moved to the third operating position (H). When operated, the speed change member (25) engages and operates the friction clutch (21) using the operation part (25b), and the speed increasing transmission gear (
22), and the pair of front wheels (1)
The vehicle is set to an increased speed drive state in which power is transmitted to the front wheel differential mechanism (28) so that the average circumferential speed of the rear wheels (2) is greater than the average circumferential speed of the pair of rear wheels (2). In other words, the shifter (26
) The sliding operation of the transmission member (25) in conjunction with the operation of the gear shift member (25) causes the two-wheel drive state to be switched to the three states described above.
前記シフター(26)に遊端部を係合させた揺動アーム
(29)とミッションケース(14)に貫設した回転筒
軸(30)とを介してシフター(26)に連動可能に、
かつ、前記回転筒袖(30)のミッションケース(14
)の外部に位置する部分にスプライン係合によって一体
回転可能に取付けられた連動具(31)と、ミッション
ケース(14)に螺着したボルト(32)とにわたって
第2図に示す如くスプリング(33)を取付け、このス
プリング(33)によってシフター(26)を前記第1
操作位置(S)に付勢してある。そして、前記揺動アー
ム(29)、回転筒軸(30)、連動具(31)、前記
回転筒軸(3o)をミッションケース(14)に対して
回転可能に貫通させ ′てあり、かつ、前記連動
具(31)に対する係合部(34a)の連動具(31)
に対する当りとプラスチック製カラー(35)のミッシ
ョンケース(14)に対する当りとによってミッション
ケース(14)に対して位置決めされた回転軸(34)
、揺動アーム(36)、レリースワイヤ(37)、連動
ロンド(38)、スプリング(39)、走行機体の前輪
取付は用フレーム(40)に軸芯(P3)周りで揺動す
るように取付けた揺動アーム(41)、及び、カム機構
(42)の夫々により、前車輪(1)とハンドル(5)
の連動部材としての前記ピットマンアーム(11)と、
シフター(26)との連動機構(43)を構成してある
。前記カム機構(42)は、第5図に示すように、ピッ
トマフ7−4(11)にボルト連結したカム板(44)
によって形成したカム溝(45)と、前記揺動アーム(
41)に支軸(46)を介して一体揺動するように取付
けた状態で前記カム溝(45)に内嵌してあるローラ(
47)とから成り、第5図に実線で示すように、前車輪
(1)が直進状態になるところの中立位置(八)を中間
箇所とした設定揺動範囲(L)にピットマンアーム(1
1)が在ると、カム溝(45)の内側部分(45a)が
ローラ(47)に作用することと前記スプリング(33
)が作用していることにより、揺動アーム(41)を第
1取付は位置(R)に位置させてシフター(26)を前
記第1操作位置(S)に位置させるように、次に、第5
図に仮想線で示すように、前記設定揺動範囲(L)を越
えて機体の左側または右側にピットマンアーム(11)
が揺tJJすると、カム溝(45)の外側部分(45b
)または(45c)がローラ(47)に作用し、ピット
マンアーム(11)の揺動力により揺動アーム(41)
を第2取付は位置(F)に揺動操作してシフター(26
)を前記第3操作位置()l)に切換え操作するように
構成してある。つまり、前車輪(1)の操向角が設定値
未満にあると前記変速装置(15)が前記標準の四輪駆
動状態にあり、前車輪(1)が前記設定値以上に操向操
作されると前記変速装置(15)が前記増速駆動状態に
自動的に切換えられるのである。A swinging arm (29) whose free end is engaged with the shifter (26) and a rotary cylinder shaft (30) penetrating the transmission case (14) can be interlocked with the shifter (26);
and the mission case (14) of the rotating sleeve (30).
As shown in FIG. ), and this spring (33) moves the shifter (26) to the first position.
It is biased to the operating position (S). The swing arm (29), the rotary cylinder shaft (30), the interlocking tool (31), and the rotary cylinder shaft (3o) are rotatably passed through the transmission case (14), and Interlocking tool (31) of the engaging part (34a) for the interlocking tool (31)
a rotating shaft (34) positioned relative to the mission case (14) by the impact against the mission case (14) and the impact of the plastic collar (35) against the mission case (14);
, swing arm (36), release wire (37), interlocking rond (38), spring (39), front wheel of the traveling aircraft is attached to the frame (40) so that it swings around the axis (P3). The front wheel (1) and the handle (5) are controlled by the swinging arm (41) and the cam mechanism (42), respectively.
the pitman arm (11) as an interlocking member;
An interlocking mechanism (43) with the shifter (26) is configured. As shown in FIG. 5, the cam mechanism (42) includes a cam plate (44) bolted to the pit muff 7-4 (11).
The cam groove (45) formed by the swing arm (
The roller (41) is fitted into the cam groove (45) while being attached to the shaft (46) so as to swing integrally therewith.
47), and as shown by the solid line in Fig. 5, the pitman arm (1
1), the inner portion (45a) of the cam groove (45) acts on the roller (47) and the spring (33)
) to position the swinging arm (41) in the first mounting position (R) and position the shifter (26) in the first operation position (S); Fifth
As shown by the imaginary line in the figure, the pitman arm (11) is located on the left or right side of the aircraft beyond the set swing range (L).
When the cam groove (45) swings tJJ, the outer part (45b) of the cam groove (45)
) or (45c) acts on the roller (47), and the swinging force of the pitman arm (11) causes the swinging arm (41) to
To install the second shifter (26), swing it to position (F).
) to the third operating position ()l). That is, when the steering angle of the front wheels (1) is less than the set value, the transmission (15) is in the standard four-wheel drive state, and the front wheels (1) are not steered beyond the set value. Then, the transmission device (15) is automatically switched to the speed-up drive state.
前記連動具(31)を、これよりシフター(26)の側
に位置する前記回転筒軸(30)に対してスプライン係
合のために摺動するように、かつ、この摺動伴って前記
係合部(34a)に対して一体回転可能に係合したり、
相対回転可能に#脱するように構成してある。そして、
第1図及び第3図に示すように、前記ミッションケース
(14)に支軸(48)及び取付は具(49)を介して
第1軸芯(P、)及び第2軸芯(P、)の夫々の周りで
揺動するように連動具操作部材(50)を取付け、前記
取付は具(49)と共に前記第1軸芯(P4)の周りで
ミッションケース(14)に対して揺動するように連設
してある筒体り52)に操作レバー(51)を摺動自在
に挿通させると共に、前記連動具操作部材(50)の操
作用アーム部(50a)にこの操作レバー(51)を相
対揺動自在にピン連結して、操作レバー(51)の人為
操作による前記連動具(31)の回動及び摺動操作によ
り前記変速装置(15)及び前記連動機構(43)の切
換えをするための操作機構を構成してある。すなわち、
操作レバー(51)に対するガイド(54)に操作レバ
ー(51)の突起部(51a)に作用するように形成し
てあるガイド?g(55)の縦溝部分(55a)に沿わ
せて操作レバー(51)を昇降操作するに伴い、連動具
操作部材(50)が第2軸芯(P、)の周りで揺動して
連動具(31)を回転筒軸(30)に対して摺動操作す
るように、かつ、前記ガイド溝(55)の横溝部分(5
5b)に沿わせて操作レバー(51)を操作するに伴い
、連動具操作部材(50)が第1軸芯(P4)の周りで
揺動して連動具(31)を押圧回転操作したり、連動具
(31)が前記スプリング(33)によって回転操作さ
れることを許容するようにしてある。更に詳述すると、
操作レバー(51)を第1操作位置(4WD I )に
操作すると、第1図に示す如く連動具(31)が回転軸
(34)に係合して連動機構(43)が連動状態になり
、かつ、ピットマンアーム(11)によるシフター(2
6)の切換え操作を許容する位置に連動具操作部材(5
0)が揺動し、変速装置(15)がピットマンアーム(
11)によって前記標準四輪駆動状態と前記増速駆動状
態とに切換え可能な前輪増速四輪駆動モードになるので
ある。そして、操作レバー (51)を第2操作位置(
4WD II )に操作すると、連動具(31)が回転
軸(34)から離脱して連動機構(43)が非連動状態
になり、かつ、シフター(26)がスプリング(33)
によって前記第1操作位置(S)に操作する位置になっ
て変速装置(15)が前記標準四輪駆動状態に維持され
る標準四輪駆動モードになるのである。そして、操作レ
バー(51)を第3操作位置(2WD)に操作すると、
連動具(31)が回転軸(34)から離脱して連動機構
(43)が非連動状態になり、かつ、シフター(26)
が前記第2操作位置(N)にくるように連動具(31)
をスプリング(33)に抗して押圧操作する位置に連動
具操作部材(50)が揺動し、操作レバー(51)を前
記第3操作位置(2WD)に解除自在に保持するバネ板
(56)の作用により、シフター(26)が第2操作位
置(N)を維持するように連動具(31)を受止め支持
するロック状態に連動具操作部材(50)が揺動し、変
速装置(15)が前記二輪駆動状態に維持される二輪駆
動モードとなるのである。The interlocking tool (31) is configured to slide for spline engagement with the rotary cylinder shaft (30) located closer to the shifter (26), and with this sliding, the engagement tool Engages with the joint part (34a) so as to be integrally rotatable,
It is constructed so that it can be relatively rotated. and,
As shown in FIGS. 1 and 3, the support shaft (48) and the attachment to the mission case (14) are the first shaft center (P, ) and the second shaft center (P, ), and the interlocking tool operating member (50) is mounted so as to swing around each of the tools (49), and the interlocking tool operating member (50) is mounted to swing relative to the transmission case (14) around the first axis (P4) together with the tool (49). The operation lever (51) is slidably inserted into the cylindrical body 52) which is connected to ) are connected with pins so as to be relatively swingable, and the transmission (15) and the interlocking mechanism (43) are switched by rotating and sliding the interlocking tool (31) by manual operation of the operating lever (51). The operating mechanism is configured to perform the following operations. That is,
Is the guide (54) for the operating lever (51) formed so as to act on the protrusion (51a) of the operating lever (51)? As the operating lever (51) is raised and lowered along the vertical groove portion (55a) of g (55), the interlocking tool operating member (50) swings around the second axis (P,). The interlocking tool (31) is slidably operated with respect to the rotary cylinder shaft (30), and the horizontal groove portion (5
5b), the interlocking tool operating member (50) swings around the first axis (P4) to press and rotate the interlocking tool (31). , the interlocking tool (31) is allowed to be rotated by the spring (33). To elaborate further,
When the operating lever (51) is operated to the first operating position (4WD I), the interlocking tool (31) engages with the rotating shaft (34) as shown in FIG. 1, and the interlocking mechanism (43) becomes interlocked. , and the shifter (2) by the pitman arm (11)
Place the interlocking tool operating member (5) in a position that allows the switching operation of (6).
0) swings, and the transmission (15) moves to the pitman arm (
11), the front wheel speed-up four-wheel drive mode is established in which the front wheels can be switched between the standard four-wheel drive state and the speed-up drive state. Then, move the operating lever (51) to the second operating position (
When operated in 4WD II), the interlocking tool (31) separates from the rotating shaft (34), the interlocking mechanism (43) becomes uninterlocked, and the shifter (26) is moved by the spring (33).
As a result, the first operation position (S) is reached and the transmission (15) enters the standard four-wheel drive mode in which the transmission device (15) is maintained in the standard four-wheel drive state. Then, when the operating lever (51) is operated to the third operating position (2WD),
The interlocking tool (31) is detached from the rotating shaft (34), the interlocking mechanism (43) is in a non-interlocking state, and the shifter (26)
the interlocking tool (31) so that it is in the second operating position (N).
The interlocking tool operating member (50) swings to a position where it is pressed against the spring (33), and the spring plate (56) releasably holds the operating lever (51) at the third operating position (2WD). ), the interlocking tool operating member (50) swings into a locked state in which the interlocking tool (31) is received and supported so that the shifter (26) maintains the second operating position (N), and the transmission device ( 15) becomes the two-wheel drive mode in which the two-wheel drive state is maintained.
尚、連動具(31)を納めている操作用カバー(61)
には、連動具(31)を回転軸(34)から離脱する方
向に付勢するスプリング(69)を内装してあり、変速
装置(15)が標準四輪駆動状態に維持されるようにそ
して操作レバー(51)が下方に付勢されるようにして
ある。In addition, the operation cover (61) that houses the interlocking tool (31)
is equipped with a spring (69) that biases the interlocking device (31) in the direction of separating from the rotating shaft (34), so that the transmission (15) is maintained in the standard four-wheel drive state. The operating lever (51) is biased downward.
前記操作レバー(51)には前輪増速牽制手段(26)
を設けてある。具体的に説明すると、操作レバー(51
)の突起部(51a)の近傍に接当部(63)を設ける
一方、カバー(54)が固設されているフェンダ−(6
4)に掛金(65)を設け、この掛金(65)を操作レ
バー(51)側に突出付勢してある。そして操作レバー
(51)を上昇操作すると、接当部(63)が掛金(6
5)のテーバ下面(65a)に接当して掛金(65)を
押し戻し、第1操作位置(4WD I )への操作が許
容されるように、又、第1操作位置(4WD I )に
操作すると接当部(63)が掛金(65)の上面に接当
して第1操作位置(4WD I ”)から第2操作位置
(4W[I II )への操作が規制されるようになっ
ている。掛金(65)には、フェンダ−(64)側に設
けられたソレノイド(SL)のプランジャー(66)を
連結してあり、第1駆動状態でこのソレノイド(SL)
を作動させることによって掛金(65)が引き戻され、
操作レバー(51)が第1操作位置(4WD I )か
ら第2操作位置(4WD II ’)へ自動的に操作さ
れて標準四輪駆動モードに切換わるようになっている。The operation lever (51) is provided with a front wheel speed increase check means (26).
is provided. To explain specifically, the operation lever (51
) is provided with an abutting portion (63) near the protrusion (51a) of the fender (6
4) is provided with a latch (65), and this latch (65) is biased to protrude toward the operating lever (51). Then, when the operation lever (51) is operated upward, the abutment part (63) is moved to the latch (6).
5) and push back the latch (65) so that operation to the first operation position (4WD I) is permitted, and operation to the first operation position (4WD I). Then, the contact part (63) comes into contact with the top surface of the latch (65), and the operation from the first operation position (4WD I'') to the second operation position (4W[I II) is restricted. A plunger (66) of a solenoid (SL) provided on the fender (64) side is connected to the latch (65), and in the first drive state, this solenoid (SL)
The latch (65) is pulled back by activating the
The operating lever (51) is automatically operated from the first operating position (4WD I) to the second operating position (4WD II') to switch to the standard four-wheel drive mode.
ソレノイド(SL)への通電は、運転部(67)に備え
られているスイッチ(SW)をONにした場合、或いは
運転部(67)後方に設けられた傾斜センサー(68)
が設定角以上の機体の前後及び左右の傾きを検出したと
きのみ、それが行われるようになっている。つまり、前
輪増速牽制手段(62)とは、傾斜地での機体の旋回に
際して前輪増速四輪駆動モードになるのを阻止し、急激
な遠心力が機体に作用しないようにするためのものであ
る。The solenoid (SL) is energized when the switch (SW) provided in the driving section (67) is turned on, or when the tilt sensor (68) provided at the rear of the driving section (67) is turned on.
This is done only when the system detects a tilt of the aircraft from front to back and from side to side that exceeds the set angle. In other words, the front wheel speed increase restraining means (62) is intended to prevent the front wheels from entering four-wheel drive mode when turning the aircraft on a slope, and to prevent sudden centrifugal force from acting on the aircraft. be.
前記ボルト(32)は、前記回転筒軸(30)のミソジ
ョンケース(14)に対する摺動を抑制するように回転
筒軸(30)に係合させである第4図に示す如きストッ
パー(57)を、ロックナツト(58)との協働によっ
てミッションケース(14)に固定するものである。そ
して、前記ポルl−(32)の頭部には前記連動具操作
部材(50)に対するストッパー部を備えてあり、この
ストッパ一部が前記シフター(26)を第2操作位置(
N)にするべく操作される前記連動具操作部材(50)
に接当して、シフター(26)を前記第2操作位置(N
)に位置決めするように前記ボルト(32)を配置して
ある。The bolt (32) is fitted with a stopper (57) as shown in FIG. 4, which is engaged with the rotary cylinder shaft (30) so as to suppress sliding of the rotary cylinder shaft (30) with respect to the mision case (14). ) is fixed to the transmission case (14) in cooperation with the lock nut (58). The head of the pole l-(32) is provided with a stopper portion for the interlocking tool operating member (50), and a portion of this stopper moves the shifter (26) to the second operating position (
N) The interlocking device operating member (50) is operated to
to move the shifter (26) to the second operating position (N
) The bolt (32) is arranged so as to be positioned at the position.
本実施例中で説明されている前輪増速牽制手段(62)
は、上記の如く構成された農用トラクターにおいて適用
されるものである。従って、ソレノイド(SL)を操作
レバー(51)に連結し、通電によって操作レバー(5
1)を下方の第2操作位置(4WD [+ )に強制的
に引き操作するようにしてもよい。又、油圧式の前輪増
速クラッチと標準駆動用クラッチとを変速装置(15)
に内装し、これらのクラッチを択一的に人切り操作する
電磁バルブを設けるとともに、前車輪(1)の操向角を
電気的に検出する操向角センサーを設け、このセンサー
から送られてくる検出信号に基づいて電磁パルプの制御
装置を作動させるように構成してある農用トラクタにあ
っては、傾斜センサーの検出信号を受けとると制御装置
が操向角センサーからの検出信号を無視するようしてお
くことで、前輪増速牽制手段を電気的な処理に代えるこ
ともできるのである。Front wheel speed increase check means (62) explained in this example
is applied to an agricultural tractor configured as described above. Therefore, the solenoid (SL) is connected to the operating lever (51), and the operating lever (51) is energized.
1) may be forcibly pulled downward to the second operation position (4WD [+). In addition, the transmission device (15) includes a hydraulic front wheel speed increasing clutch and a standard drive clutch.
It is equipped with an electromagnetic valve that selectively operates these clutches, and is also equipped with a steering angle sensor that electrically detects the steering angle of the front wheels (1). In agricultural tractors that are configured to operate the electromagnetic pulp control device based on the detection signal from the steering angle sensor, when the control device receives the detection signal from the tilt sensor, the control device ignores the detection signal from the steering angle sensor. By doing so, the front wheel speed increase check means can be replaced with electrical processing.
また、(頃斜センサー(68)を機体の前後若しくは左
右の傾きのみを検出するものとしてもよい。Alternatively, the tilt sensor (68) may be configured to detect only the longitudinal or horizontal tilt of the aircraft body.
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作業車の実施例を示し、第1図は前
輪増速装置と前輪増速牽制手段の操作構造を示す縦断正
面図、第2図は第1図の■−■線断面図、第3図は第1
図の■−■線断面図、第4図は第1図のrV−IV線断
面図第5図は前車輪の操作構造を示す平面図、第6図は
同側面図、第7図は全体側面図である。
(1)・・・・・・前輪、(2)・・・・・・後輪、(
15)・・・・・・前輪変速装置、(62)・・・・・
・前輪増速牽制手段、(68)・・・・・・(頃斜セン
サー。The drawings show an embodiment of the working vehicle according to the present invention, FIG. 1 is a longitudinal sectional front view showing the operation structure of the front wheel speed increasing device and the front wheel speed increasing check means, and FIG. 2 is a cross section taken along the line ■-■ in FIG. 1. Figure 3 is the first
4 is a sectional view taken along the line rV-IV in FIG. FIG. (1)...Front wheel, (2)...Rear wheel, (
15)...Front wheel transmission, (62)...
・Front wheel speed increase check means, (68)...(circle tilt sensor)
Claims (1)
高速に設定する増速駆動状態と、前後輪(1)、(2)
の回転速度を略同速に設定する標準駆動状態とに切換可
能な前輪変速装置(15)を設けるとともに、前輪(1
)の左右操向角が設定角度以上になると前記前輪変速装
置(15)を増速駆動状態に切換えるべく構成してある
作業車であって、機体の傾斜を検出する傾斜センサー(
68)を設け、この傾斜センサー(68)が設定角以上
の機体の傾きを検出すると、前記前輪変速装置(15)
の増速駆動状態への切換えを不能にする前輪増速牽制手
段(62)を設けてある作業車。A speed-up drive state in which the rotation speed of the front wheel (1) is set higher than the rotation speed of the rear wheel (2), and the front and rear wheels (1) and (2).
A front wheel transmission (15) is provided that can switch between a standard drive state in which the rotational speeds of the front wheels (15 and 15) are set at approximately the same speed.
The work vehicle is configured to switch the front wheel transmission (15) to an increased speed drive state when the left and right steering angle of the machine body ( ) exceeds a set angle, and the work vehicle includes a tilt sensor (
68), and when this tilt sensor (68) detects a tilt of the aircraft by a set angle or more, the front wheel transmission (15)
A work vehicle is provided with a front wheel speed increase check means (62) that makes it impossible to switch to a speed increase drive state.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63045496A JPH0725277B2 (en) | 1988-02-27 | 1988-02-27 | Work vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63045496A JPH0725277B2 (en) | 1988-02-27 | 1988-02-27 | Work vehicle |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01218922A true JPH01218922A (en) | 1989-09-01 |
JPH0725277B2 JPH0725277B2 (en) | 1995-03-22 |
Family
ID=12721008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63045496A Expired - Lifetime JPH0725277B2 (en) | 1988-02-27 | 1988-02-27 | Work vehicle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0725277B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006315618A (en) * | 2005-05-16 | 2006-11-24 | Kubota Corp | Working vehicle |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0174923U (en) * | 1987-11-06 | 1989-05-22 |
-
1988
- 1988-02-27 JP JP63045496A patent/JPH0725277B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0174923U (en) * | 1987-11-06 | 1989-05-22 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006315618A (en) * | 2005-05-16 | 2006-11-24 | Kubota Corp | Working vehicle |
Also Published As
Publication number | Publication date |
---|---|
JPH0725277B2 (en) | 1995-03-22 |
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