JPH04183640A - Automatic diff-lock device of vehicle - Google Patents

Automatic diff-lock device of vehicle

Info

Publication number
JPH04183640A
JPH04183640A JP31111490A JP31111490A JPH04183640A JP H04183640 A JPH04183640 A JP H04183640A JP 31111490 A JP31111490 A JP 31111490A JP 31111490 A JP31111490 A JP 31111490A JP H04183640 A JPH04183640 A JP H04183640A
Authority
JP
Japan
Prior art keywords
hydraulic
diff
lock
differential
hydraulic cylinder
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
Application number
JP31111490A
Other languages
Japanese (ja)
Other versions
JP2735687B2 (en
Inventor
Masatoshi Iwamoto
正寿 岩本
Takao Nishikawa
孝男 西川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP2311114A priority Critical patent/JP2735687B2/en
Publication of JPH04183640A publication Critical patent/JPH04183640A/en
Application granted granted Critical
Publication of JP2735687B2 publication Critical patent/JP2735687B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)
  • Retarders (AREA)

Abstract

PURPOSE:To lock/unlock a diff-lock device automatically by locking a hydraulic type diff-lock device when a vehicle makes a straight run, providing a changeover valve which changes over the hydraulic type diff-lock device to the unlock side when the vehicle makes a turn, and utilizing the pressure difference within a hydraulic steering device. CONSTITUTION:When a vehicle is making a straight run, the pressures in the right and the left chambers of the hydraulic cylinder 10 of a steering device 9 are equalized to each other and a changeover valve 24 is set in a neutral and locked position. The pressure oil which is fed from a hydraulic pump 23 to a return side circuit 25 through the steering device 9 is fed to hydraulic cylinders 15, 16 of diff-lock devices 11, 12 through the changeover valve 24. Thus, diff-lock shifters 13, 14 slide and lock diff devices 4, 6 to be inoperative in differential action. On the other hand, when a vehicle makes a turn, a steering wheel 19 is steered to the left hand side, for example, the control valve 20 and the pump 21 of the steering device 9 make differential motion, and the pressure oil from the hydraulic pump 23 is fed to the chamber 10a of the hydraulic cylinder 10. This generates a large pressure difference between respective right and the left chamber spaces of the hydraulic cylinder 10, leading to the changeover of the changeover valve 24 to the unlock side.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、トラクタ等の車輌の自動デフロック装置に関
するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic differential lock device for a vehicle such as a tractor.

(従来の技術) 不整地を走行する車輌、例えばトラクタにおいては、直
進走行性を良くするために、直進走行時にデフ装置をロ
ックするデフロック装置を備えている。このデフロック
装置には油圧ピストン等を利用して油圧を加えることに
よって作動する油圧式のものがある。
(Prior Art) Vehicles that travel on rough terrain, such as tractors, are equipped with a differential lock device that locks a differential device during straight travel in order to improve straight travel performance. There is a hydraulic type differential lock device that operates by applying hydraulic pressure using a hydraulic piston or the like.

しかし、従来のデフロック装置は、油圧式であっても、
デフロックペダルの踏込み操作で切換弁を切換えるか、
又はパネルのスイッチ操作で電磁切換弁を切換える形式
を採っており、デフロック装置のロック・アンロック時
にオペレータの操作が必ず必要である。
However, conventional differential lock devices, even if they are hydraulic,
Switch the switching valve by pressing the differential lock pedal, or
Alternatively, the electromagnetic switching valve is switched by operating a switch on the panel, and an operator's operation is always required when locking and unlocking the differential lock device.

(発明が解決しようとする課題) 従来は前述の如くデフロック装置のロック・アンロック
時に必ず人為的な操作が必要であるため、操作が煩わし
いという課題がある。
(Problems to be Solved by the Invention) Conventionally, as described above, manual operation is always required when locking and unlocking the differential lock device, so there is a problem that the operation is troublesome.

本発明は、かかる従来の課題に鑑み、油圧式ステアリン
グ装置の油圧シリンダ内の圧力差を利用して自動的にデ
フ装置をロック・アン口・ツクできるようにすることを
目的とするものである。
In view of such conventional problems, the present invention aims to make it possible to automatically lock, unlock, and engage the differential device by utilizing the pressure difference within the hydraulic cylinder of the hydraulic steering device. .

(課題を解決するための手段) 本発明は、油圧式ステアリング装置9と、デフ装置4,
6をロックする油圧式デフロック装置11.12とを備
えた車輌において、直進走行時に油圧式デフロック装置
lL12をロック状態にし、油圧式ステアリング装置9
の作動時にその油圧シリンダ10内の圧力差により、油
圧式デフロック装置11.12をアンロック側に切換え
る切換弁24を設けたものである。
(Means for Solving the Problems) The present invention provides a hydraulic steering device 9, a differential device 4,
In a vehicle equipped with a hydraulic differential lock device 11 or 12 that locks the hydraulic steering device 9, the hydraulic differential lock device 1L12 is locked when driving straight ahead, and the hydraulic differential lock device 1L12 is locked when driving straight ahead.
A switching valve 24 is provided to switch the hydraulic differential lock device 11, 12 to the unlock side based on the pressure difference within the hydraulic cylinder 10 when the differential lock device 11, 12 is activated.

(作 用) 車輌の直進走行時には、切換弁24からデフロック装置
11.12に圧油が送られ、デフロック装置11゜12
がデフ装置4,6をロックしている。
(Function) When the vehicle is traveling straight, pressure oil is sent from the switching valve 24 to the differential lock device 11.12, and the differential lock device 11.12
locks the differential devices 4 and 6.

旋回等でステアリング装置9が作動すると、油圧シリン
ダ10内に圧力差が発生し、切換弁24がアンロック側
に切換わる。このためデフロック装置lL12がデフ装
置4,6をアンロックする。従って、ロック・アンロッ
ク時の人為的操作が不要である。
When the steering device 9 operates during a turn or the like, a pressure difference is generated within the hydraulic cylinder 10, and the switching valve 24 is switched to the unlock side. Therefore, the differential lock device LL12 unlocks the differential devices 4 and 6. Therefore, no manual operation is required when locking/unlocking.

(実施例) 以下、本発明の実施例を図面に基いて詳述する。(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

第2図はトラクタの動力伝達系を示し、1はエンジン、
2は主クラッチ、3は走行変速装置である。4は後輪デ
フ装置で、変速装置3からの動力を左右の後輪5に伝達
するようになっている。6は前輪デフ装置で、ギヤー列
7を介して変速装置3に連動し、左右の前輪8に動力を
伝達するようになっている。左右の前輪8は油圧式ステ
アリング装置9の油圧シリンダ10の作動により、キン
グピン廻りにステアリング動作するようになっている。
Figure 2 shows the power transmission system of the tractor, where 1 is the engine;
2 is a main clutch, and 3 is a traveling transmission. 4 is a rear wheel differential device, which transmits the power from the transmission 3 to the left and right rear wheels 5. A front wheel differential device 6 is connected to the transmission device 3 via a gear train 7, and transmits power to the left and right front wheels 8. The left and right front wheels 8 are steered around a king pin by the operation of a hydraulic cylinder 10 of a hydraulic steering device 9.

デフ装置4,6には、直進走行時に差動動作不能にロッ
クするための油圧式デフロック装置11.12が備えら
れている。
The differential devices 4 and 6 are equipped with hydraulic differential lock devices 11 and 12 for locking the differential so that the vehicle cannot operate during straight traveling.

デフロック装置11.12は、第1図に示すように機械
的咬合式のデフロックシフタ13.14と、油圧シリン
ダ15.16とを備えたものであって、油圧シリンダ1
5.16に圧油が供給された時にデフ口・ツクシフタ1
3.14がロック方向(a矢示)に摺動し、圧油の供給
が断たれた時にバネ17.18によってデフロックシフ
タ13.14がアンロック方向(b矢示)に摺動するよ
うになっている。
As shown in FIG. 1, the differential lock device 11.12 includes a mechanically engaged differential lock shifter 13.14 and a hydraulic cylinder 15.16.
5. When pressure oil is supplied to 16, the differential opening and shifter 1
3.14 slides in the lock direction (arrow a), and when the pressure oil supply is cut off, the differential lock shifter 13.14 slides in the unlock direction (arrow b) by the spring 17.18. It has become.

ステアリング装置9は油圧シリンダ10の他に、ハンド
ル19に連動する制御弁20、メータリングポンプ21
等を有し、ハンドル19の操作に連動して油圧シリンダ
10の作動方向を制御するようになっている。22.2
3は油圧ポンプである。24はデフロック装置lL12
を制御するための切換弁で、ステアリング装置9の戻り
何回路25と各油圧シリンダ15゜16との間に介装さ
れている。切換弁24は油圧作動型の3位置切換弁によ
り構成され、そのスプールの両端は油圧シリンダ10の
左右各室に接続されている。そして、切換弁24は油圧
シリンダ10の左右各室の圧力が均等の時(直進走行時
)には、戻り何回路25から各油圧シリンダ15.16
に圧油を送る中立状態にあり、油圧シリンダ10の左右
各室に圧力差が発生した時(旋回時)に、その圧力差に
よってアンロック側に切換わり、油圧シリンダ15゜1
6の油をドレンするようになっている。26は油圧クラ
ッチ等の油圧機器である。
In addition to the hydraulic cylinder 10, the steering device 9 includes a control valve 20 and a metering pump 21 that are linked to the handle 19.
The operating direction of the hydraulic cylinder 10 is controlled in conjunction with the operation of the handle 19. 22.2
3 is a hydraulic pump. 24 is the differential lock device LL12
This switching valve is interposed between the return circuit 25 of the steering device 9 and each hydraulic cylinder 15 and 16. The switching valve 24 is constituted by a hydraulically operated three-position switching valve, and both ends of its spool are connected to the left and right chambers of the hydraulic cylinder 10. When the pressures in the left and right chambers of the hydraulic cylinder 10 are equal (during straight forward travel), the switching valve 24 connects the return circuit 25 to each hydraulic cylinder 15, 16.
When a pressure difference occurs between the left and right chambers of the hydraulic cylinder 10 (during turning), the pressure difference switches to the unlock side, and the hydraulic cylinder 15°1
It is designed to drain the oil from No. 6. 26 is a hydraulic device such as a hydraulic clutch.

次に動作を説明する。直進走行時にはステアリング装置
9の油圧シリンダ10の左右各室の圧力は均等であり、
切換弁24は中立のロック位置にある。
Next, the operation will be explained. When traveling straight, the pressure in the left and right chambers of the hydraulic cylinder 10 of the steering device 9 is equal;
The switching valve 24 is in a neutral lock position.

このため油圧ポンプ23からステアリング装置9を経て
戻り何回路25に送られた圧油は、切換弁24を経てデ
フロック装置11.12の油圧シリンダ15.16へと
送られるので、デフロックシフタ13.14がa矢示方
向に摺動して、デフ装置4.6を差動動作不能にロック
する。
For this reason, the pressure oil returned from the hydraulic pump 23 via the steering device 9 and sent to the circuit 25 is sent to the hydraulic cylinder 15.16 of the differential lock device 11.12 via the switching valve 24, so that the pressure oil is sent to the differential lock shifter 13.14. slides in the direction of arrow a to lock the differential device 4.6 so that differential operation is disabled.

旋回に際して、例えばハンドル19を左方向へと操作す
ると、ステアリング装置9の制御弁20、ポンプ21が
作動し、油圧ポンプ23からの圧油が油圧シリンダ10
の室10aに送られる。このため油圧シリンダ10の左
右各室間に大きな圧力差が発生し、この圧力差によって
切換弁24のスプールがC矢示方向に動き、切換弁24
がアンロック側に切換わる。
When turning, for example, when the steering wheel 19 is operated to the left, the control valve 20 and pump 21 of the steering device 9 are activated, and pressure oil from the hydraulic pump 23 is supplied to the hydraulic cylinder 10.
is sent to the chamber 10a. Therefore, a large pressure difference occurs between the left and right chambers of the hydraulic cylinder 10, and this pressure difference causes the spool of the switching valve 24 to move in the direction of arrow C.
is switched to the unlock side.

従って、油圧シリンダ15.16内の油はバネ17.1
8の力によってドレンされて行き、デフロックシフタ1
3.14がb矢示のアンロック方向に摺動する。
Therefore, the oil in the hydraulic cylinder 15.16 is absorbed by the spring 17.1.
Drained by the force of 8, differential lock shifter 1
3.14 slides in the unlock direction indicated by arrow b.

このためデフロック装置lL12が共にデフ装置4゜6
をアンロックし、デフ装置4,6が旋回動作に応じて差
動動作をする。
Therefore, both the differential lock devices 1L12 and 4°6
is unlocked, and the differential devices 4 and 6 perform differential operation in accordance with the turning operation.

このようにステアリング装置9に連動してデフロック装
置11.12がデフ装置4,6を自動的にロソり・アン
ロックするので、デフロック装置11.12を人為的に
操作する必要がなく、操作の煩わしさを解消することが
できる。
In this way, the differential lock device 11.12 automatically unlocks and unlocks the differential devices 4 and 6 in conjunction with the steering device 9, so there is no need to manually operate the differential lock device 11.12, and the operation is easy. You can eliminate the hassle.

なお、実施例では、四輪駆動型について説明したが、前
・後輪5.8の何れか一方のみを駆動する二輪駆動型の
場合にも同様に実施できることは云うまでもない。
In the embodiment, a four-wheel drive type has been described, but it goes without saying that the same can be applied to a two-wheel drive type in which only one of the front and rear wheels is driven.

また切換弁24の一対の戻しバネ27.28にネジ機構
を設けてそのバネ力を任意に調節できるようにしても良
い。
Further, the pair of return springs 27 and 28 of the switching valve 24 may be provided with a screw mechanism so that the spring force thereof can be adjusted as desired.

(発明の効果) 本発明は以上の通りであり、油圧式ステアリング装置と
、デフ装置をロックする油圧式デフロック装置とを備え
た車輪において、直進走行時に油圧式デフロック装置を
ロック状態にし、油圧式ステアリング装置の作動時にそ
の油圧シリンダ内の圧力差により、油圧式デフロック装
置をアンロンク側に切換える切換弁24を設けたので、
油圧式ステアリング装置の油圧シリンダ内の圧力差を利
用して自動的にデフ装置をロック・アンロツタでき、従
って、人為的な操作が不要となり、操継性を向上できる
(Effects of the Invention) The present invention is as described above, and in a wheel equipped with a hydraulic steering device and a hydraulic differential lock device that locks a differential device, when the hydraulic differential lock device is locked when traveling straight, the hydraulic differential lock device is locked. A switching valve 24 is provided that switches the hydraulic differential lock device to the unlock side based on the pressure difference within the hydraulic cylinder when the steering device is activated.
The differential device can be automatically locked and unlocked using the pressure difference within the hydraulic cylinder of the hydraulic steering device, thus eliminating the need for manual operation and improving controllability.

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

図面は本発明の一実施例を示し、第1図は油圧回路図、
第2図は動力伝達系の構成図である。 4・・・後輪デフ装置、6・・・前輪デフ装置、9・・
・油圧式ステアリング装置、10・・・油圧シリンダ、
11,12・・・油圧式デフロック装置、24・・・切
換弁。
The drawings show an embodiment of the present invention, and FIG. 1 is a hydraulic circuit diagram;
FIG. 2 is a configuration diagram of the power transmission system. 4... Rear wheel differential device, 6... Front wheel differential device, 9...
・Hydraulic steering device, 10...hydraulic cylinder,
11, 12...Hydraulic differential lock device, 24...Switching valve.

Claims (1)

【特許請求の範囲】[Claims] (1)油圧式ステアリング装置(9)と、デフ装置(4
)(6)をロックする油圧式デフロック装置(11)(
12)とを備えた車輌において、直進走行時に油圧式デ
フロック装置(11)(12)をロック状態にし、油圧
式ステアリング装置(9)の作動時にその油圧シリンダ
(10)内の圧力差により、油圧式デフロック装置(1
1)(12)をアンロック側に切換える切換弁(24)
を設けたことを特徴とする車輌の自動デフロツク装置。
(1) Hydraulic steering device (9) and differential device (4)
) (6) Hydraulic differential lock device (11) (
12), the hydraulic differential lock devices (11) and (12) are locked when traveling straight, and when the hydraulic steering device (9) is activated, the hydraulic pressure is increased due to the pressure difference in the hydraulic cylinder (10). Type differential lock device (1
1) Switching valve (24) that switches (12) to the unlock side
An automatic deflock device for a vehicle, characterized in that it is provided with.
JP2311114A 1990-11-15 1990-11-15 Automatic diff lock device for vehicles Expired - Lifetime JP2735687B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2311114A JP2735687B2 (en) 1990-11-15 1990-11-15 Automatic diff lock device for vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2311114A JP2735687B2 (en) 1990-11-15 1990-11-15 Automatic diff lock device for vehicles

Publications (2)

Publication Number Publication Date
JPH04183640A true JPH04183640A (en) 1992-06-30
JP2735687B2 JP2735687B2 (en) 1998-04-02

Family

ID=18013314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2311114A Expired - Lifetime JP2735687B2 (en) 1990-11-15 1990-11-15 Automatic diff lock device for vehicles

Country Status (1)

Country Link
JP (1) JP2735687B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102358181B (en) * 2011-08-30 2014-07-09 三一汽车起重机械有限公司 Differential protection device and engineering machinery

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62124338A (en) * 1985-11-22 1987-06-05 Nissan Motor Co Ltd Differential limit control device for vehicle
JPS62110647U (en) * 1985-12-28 1987-07-14

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62124338A (en) * 1985-11-22 1987-06-05 Nissan Motor Co Ltd Differential limit control device for vehicle
JPS62110647U (en) * 1985-12-28 1987-07-14

Also Published As

Publication number Publication date
JP2735687B2 (en) 1998-04-02

Similar Documents

Publication Publication Date Title
US7182353B2 (en) Turn brake for multi-track vehicles
KR950003840B1 (en) Four wheel drive working vehicle
US3917013A (en) Single pedal braking system for crawler tractor
US5293956A (en) Four wheel drive working vehicle
CA1145680A (en) Steering mechanism with drop-arm
JPH04183640A (en) Automatic diff-lock device of vehicle
US4789036A (en) Hydraulic steering device
JP2918982B2 (en) Steering gear
JPS6341257Y2 (en)
SU935325A1 (en) Vehicle
JPH06265Y2 (en) Front wheel shift structure of work vehicle
JPH0534305Y2 (en)
JP3580614B2 (en) Aircraft stopping device for traveling vehicles
JP3097632B2 (en) Traveling gear for working vehicles
JP3413993B2 (en) Tractor steering system
JPH0414272Y2 (en)
JPS6225419Y2 (en)
JPH0525985Y2 (en)
JP3077288B2 (en) Four-wheel steering system for powered vehicles
JP2918981B2 (en) Steering gear
JP2503540B2 (en) Hydraulic rear wheel steering mechanism for 4-wheel steering vehicle
JPH0653496B2 (en) Rear wheel steering system
JPH061121U (en) Switching mechanism for four-wheel steering system for agricultural vehicles
JPH0995256A (en) Automatic brake control device for tractor
JPH0798455B2 (en) Four-wheel drive agricultural tractor