JPH0814358A - Travel device - Google Patents

Travel device

Info

Publication number
JPH0814358A
JPH0814358A JP14736594A JP14736594A JPH0814358A JP H0814358 A JPH0814358 A JP H0814358A JP 14736594 A JP14736594 A JP 14736594A JP 14736594 A JP14736594 A JP 14736594A JP H0814358 A JPH0814358 A JP H0814358A
Authority
JP
Japan
Prior art keywords
transmission
engine
hydraulic drive
speed
hydraulic
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
Application number
JP14736594A
Other languages
Japanese (ja)
Inventor
Hisayuki Satoji
久幸 里路
Kiyoshi Fujita
清 藤田
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.)
Iseki and Co Ltd
Iseki Agricultural Machinery Mfg Co Ltd
Original Assignee
Iseki and Co Ltd
Iseki Agricultural Machinery Mfg Co Ltd
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 Iseki and Co Ltd, Iseki Agricultural Machinery Mfg Co Ltd filed Critical Iseki and Co Ltd
Priority to JP14736594A priority Critical patent/JPH0814358A/en
Publication of JPH0814358A publication Critical patent/JPH0814358A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Transmission Device (AREA)

Abstract

PURPOSE:To switch a transmission system in a transmission to a low-speed transmission means when charging pressure drops to or below a set value, by utilizing the charging pressure with which a closed-circuit hydraulic drive is replenished with oil, in a travel device provided with the closed-circuit hydraulic drive. CONSTITUTION:A hydraulic pump 10 for driving the hydraulic motor 11 of a hydraulic drive 1, and a charge pump 9 for replenishing the hydraulic drive 1 with oil are driven by an engine 2, and the output shaft 11a of the hydraulic motor 11 is connected to a transmission, and power from the engine 2 is also transmitted to a power system 12 other than a travel device, and a switching means 7 is provided for switching the transmitting state of a high-speed transmission means 6 to that of a low-speed transmission means 5 as the charging pressure of the charge pump 9 drops to or below a set value.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、油圧駆動装置を備え
た走行装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling device equipped with a hydraulic drive device.

【0002】[0002]

【従来の技術】従来の油圧駆動装置を備えた走行装置に
おいては、油圧駆動装置の閉回路内に油を補給する際の
チャージ圧力と独立して、手動で走行装置内の低速伝達
手段と高速伝達手段を切り換える構成である。
2. Description of the Related Art In a traveling apparatus equipped with a conventional hydraulic drive device, a low speed transmission means and a high speed transmission means in the traveling device are manually operated independently of charge pressure when replenishing oil into a closed circuit of the hydraulic drive device. This is a configuration for switching the transmission means.

【0003】[0003]

【発明が解決しようとする課題】前述のような走行装置
では、走行軸に大きな負荷がかかった状態のままで、ト
ランスミッション内の伝動系が高速伝達側であると、エ
ンジンの回転数が低下して来て、走行系以外に動力を利
用している場合に不具合が生じてくる。例えば、農業機
械であるコンバインにおいて、脱穀系の動力は常に一定
の回転数で回転するのが望ましいが、刈取作業中に走行
装置に負荷がかかってエンジンの回転数が低下すると、
脱穀系統の回転数も低下してきて、脱穀選別能力が低下
してくるという欠点があった。本発明は、このような不
具合を解消しようとするものである。
In the traveling apparatus described above, if the transmission system in the transmission is on the high-speed transmission side while the traveling shaft is still heavily loaded, the engine speed will decrease. However, problems occur when power is used for other than the traveling system. For example, in a combine that is an agricultural machine, it is desirable that the power of the threshing system always rotates at a constant rotation speed, but when the traveling device is loaded and the rotation speed of the engine decreases during mowing work,
The number of revolutions of the threshing system has also been reduced, and the threshing selection ability has been reduced. The present invention is intended to solve such a problem.

【0004】[0004]

【課題を解決するための手段】この発明に係る走行装置
は、前記のような課題を解決するものであって、次のよ
うな構成である。すなわち、冒記構成の走行装置におい
て、エンジン2で油圧駆動装置1の油圧モータ11駆動
用の油圧ポンプ10及び油圧駆動装置1にオイルを補給
するチャージポンプ9を駆動し、前記油圧モータ11の
出力軸11aはトランスミッション3と連結し、更に、
走行装置以外の動力系12にもエンジン2からの動力を
伝達する構成とし、該チャージポンプ9のチャージ圧力
が設定値以下の低下に関連して、高速伝達手段6の伝動
状態から低速伝動手段5の伝動状態に切り換える切換手
段7を設けたことを特徴とする走行装置とした。
A traveling device according to the present invention solves the above-mentioned problems and has the following structure. That is, in the traveling device having the structure described above, the engine 2 drives the hydraulic pump 10 for driving the hydraulic motor 11 of the hydraulic drive device 1 and the charge pump 9 that supplies oil to the hydraulic drive device 1, and outputs the output of the hydraulic motor 11. The shaft 11a is connected to the transmission 3, and further,
Power from the engine 2 is also transmitted to the power system 12 other than the traveling device, and in connection with the decrease in the charge pressure of the charge pump 9 below a set value, the high-speed transmission means 6 changes from the transmission state to the low-speed transmission means 5. The traveling device is characterized in that it is provided with a switching means 7 for switching the transmission state.

【0005】[0005]

【作用】冒記構成の走行装置で、エンジン2が回転する
と油圧駆動装置1の油圧ポンプ10が回転し、油が循環
して油圧モータ11が回転する。それにより油圧モータ
11の出力軸11aが回転してトランスミッション3内
に動力を伝達し、走行軸4を回転させる。前記トランス
ミッション3内には、走行軸4を低速側と高速側とに切
り換えて走行可能な低速伝達手段5と高速伝達手段6が
設けてあり、高速伝達手段6で走行中、走行軸4に大き
な負荷が作用すると、エンジン2の回転数は低下してく
る。同時に走行装置以外の動力系12の回転数も低下し
てきて、不具合が生じてくる。この時、チャージポンプ
9の回転数も低下して、油圧駆動装置1内にオイルを補
給するチャージ圧力も低下してくるが、この低下したチ
ャージ圧力を利用して、トランスミッション3内に設け
てある伝動系を低速伝達手段5での動力伝達になるよう
に、切換手段7を切り換えられる。これにより、エンジ
ン2の回転数低下を防止でき、略一定の回転で回り続け
ることができる。
When the engine 2 rotates, the hydraulic pump 10 of the hydraulic drive device 1 rotates, the oil circulates, and the hydraulic motor 11 rotates. As a result, the output shaft 11a of the hydraulic motor 11 rotates to transmit power to the transmission 3 and rotate the traveling shaft 4. The transmission 3 is provided with a low speed transmission means 5 and a high speed transmission means 6 capable of traveling by switching the traveling shaft 4 between a low speed side and a high speed side. When the load acts, the engine speed of the engine 2 decreases. At the same time, the rotational speed of the power system 12 other than the traveling device also decreases, causing a problem. At this time, the rotation speed of the charge pump 9 also decreases, and the charge pressure for replenishing the oil in the hydraulic drive device 1 also decreases. However, the decreased charge pressure is used to provide the transmission 3 inside. The switching means 7 can be switched so that the low speed transmission means 5 transmits power to the transmission system. As a result, it is possible to prevent a decrease in the rotation speed of the engine 2, and it is possible to continue rotating at a substantially constant rotation.

【0006】[0006]

【実施例】図1及び図2には、この発明の実施例を具備
した農業機械であるコンバインの走行装置が示されてい
る。エンジン2の動力は油圧駆動装置1の油圧ポンプ1
0を回転させ、油が循環して油圧モータ11を回転させ
る。すると、トランスミッション3には油圧モータ出力
軸11aを介して動力が伝達され、走行軸4が回転す
る。油圧駆動装置1の特性上、エンジン2の回転数は常
に一定値以上で定速回転させなければならず、このた
め、前後進及び無段変速は油圧モータ10の斜板10a
を傾動させて行なう構成である。前記トランスミッショ
ン3内には、走行軸4を低速側と高速側とに切り換えて
走行可能なように、低速伝達手段5と高速伝達手段6が
設けてあり、高速伝達手段6で走行中、走行軸4に大き
な負荷が作用すると、エンジン2の回転数は低下してく
る。このため、駆動トルクも低下して、例えば、湿田な
どでは走行不能に陥ることもある。さらに、エンジンの
回転が低下すると、チャージポンプ9の回転数も低下し
て、油圧駆動装置1にオイルを補給するチャージ圧力が
低下してくるが、この低下したチャージ圧力を利用し
て、トランスミッション3内の伝動系を低速伝達手段5
になるように、切換手段7を切り換える。これにより、
エンジン2の回転数は略一定に保つことができ、駆動ト
ルクの低下も防止できて、湿田での走行性能に影響を与
えない。
1 and 2 show a traveling device for a combine, which is an agricultural machine, according to an embodiment of the present invention. The power of the engine 2 is the hydraulic pump 1 of the hydraulic drive system 1.
0 is rotated and oil circulates to rotate the hydraulic motor 11. Then, power is transmitted to the transmission 3 via the hydraulic motor output shaft 11a, and the traveling shaft 4 rotates. Due to the characteristics of the hydraulic drive system 1, the engine 2 must always be rotated at a constant speed at a constant value or higher, and therefore forward and backward and continuously variable speeds are used for the hydraulic motor 10.
This is a configuration that is performed by tilting. In the transmission 3, a low speed transmission means 5 and a high speed transmission means 6 are provided so that the traveling shaft 4 can be switched between a low speed side and a high speed side. When a large load acts on No. 4, the engine speed of the engine 2 decreases. For this reason, the driving torque is also reduced, and the vehicle may be unable to travel in wetlands, for example. Further, when the rotation of the engine is reduced, the rotation speed of the charge pump 9 is also reduced, and the charge pressure for replenishing the hydraulic drive device 1 with oil is reduced. The reduced charge pressure is used to transmit the transmission 3 The low speed transmission means 5
The switching means 7 is switched so that This allows
The rotation speed of the engine 2 can be kept substantially constant, the driving torque can be prevented from lowering, and the running performance in the wetland is not affected.

【0007】また、エンジン2からの動力は走行装置以
外の動力系12にも利用されている。本実施例では、コ
ンバインであるので走行装置以外の動力系12は、脱穀
の動力系を示している。13は穀稈を脱穀する扱胴であ
り、14は扱胴13に並設された処理胴である。前記の
ようにエンジン2の回転数が低下してくると、扱胴13
や処理胴14の回転数が低下してきて、脱穀性能が大き
く低下してくるが、低下したチャージ圧力を利用してト
ランスミッション3内の伝動系を低速伝達手段5になる
ように構成したので、脱穀の動力系は略一定の回転数で
回転し、安定した脱穀作業ができる。
The power from the engine 2 is also used for the power system 12 other than the traveling device. In the present embodiment, the power system 12 other than the traveling device is a combine power system, and therefore represents a threshing power system. Reference numeral 13 is a handling cylinder for threshing the culm, and 14 is a processing barrel provided in parallel with the handling barrel 13. As described above, when the rotation speed of the engine 2 decreases, the handling cylinder 13
Although the threshing performance is greatly reduced due to a decrease in the rotation speed of the processing cylinder 14 and the processing cylinder 14, the transmission system in the transmission 3 is configured to serve as the low speed transmission means 5 by utilizing the reduced charge pressure. The power system of (3) rotates at a substantially constant number of rotations, and stable threshing work can be performed.

【0008】この実施例では、切換手段7は油圧切換バ
ルブとなっているが、圧力センサ等他の装置を用いても
よい。また、トランスミッション3内には前述したよう
に、伝動系は低速伝達手段5と高速伝達手段6の2段で
あるが、3段以上設けて、繊細な制御を行なってもよ
い。図3〜図5には、チャージポンプ9からのチャージ
圧力を圧力センサ15にて測定し、中央処理装置19
(以下CPUという)に検出圧力値を入力し、そのデー
タに基づいて、エンジン2の回転数が常に一定になるよ
うに、クラッチ一速16,クラッチ二速17,クラッチ
三速18を選択して接続する構成が示されている。従来
は、手動でクラッチの切り換え操作を行なっていたが、
エンジン2の回転数を一定に保つのは非常に難しく、し
かも、安定しない走行路面では頻繁に手動で変速しなく
てはならなかった。これにより、エンジン2の回転数変
動はさらに小さく、しかも正確に抑えることができる。
In this embodiment, the switching means 7 is a hydraulic switching valve, but other devices such as a pressure sensor may be used. Further, as described above, the transmission system has two stages of the low speed transmission means 5 and the high speed transmission means 6 in the transmission 3, but three or more stages may be provided to perform delicate control. 3 to 5, the charge pressure from the charge pump 9 is measured by the pressure sensor 15, and the central processing unit 19 is used.
The detected pressure value is input to (hereinafter referred to as CPU), and based on the data, the clutch first speed 16, the clutch second speed 17, and the clutch third speed 18 are selected so that the rotation speed of the engine 2 is always constant. The configuration to connect is shown. Conventionally, the clutch switching operation was performed manually,
It was very difficult to keep the engine 2 rotating at a constant speed, and moreover, on an unstable road surface, it was necessary to frequently shift gears manually. As a result, fluctuations in the rotation speed of the engine 2 can be further reduced and accurately suppressed.

【0009】なお、オイルタンク8内のオイルが無くな
ると、この状態のままで油圧駆動装置1を回転しつづけ
れば、該油圧駆動装置1が焼き付く等の不具合が発生
し、走行不能となる。これを防止するため、従来は、オ
イルタンク8内にレベルセンサを設けていたが、エンジ
ン2が回転している間は常にオイルタンク8内のオイル
は循環しているので気泡が発生していて、今一つレベル
センサの信頼性に欠けていた。そこで、オイルタンク8
内のオイルが無くなると、チャージ圧力はゼロとなるの
で、チャージ圧力を測定する圧力センサ15により、チ
ャージ圧力がゼロとなったことを検出すれば、CPU1
9に入力して、アラート20でオペレーターに知らせる
構成とした。これにより、油圧駆動装置1の焼き付きを
未然に防止することができる。また、エンジン停止回路
21に指令を出して、自動的にエンジン2を停止しても
よい。
When the oil in the oil tank 8 is exhausted, if the hydraulic drive unit 1 continues to rotate in this state, a problem such as seizure of the hydraulic drive unit 1 occurs and the vehicle cannot run. In order to prevent this, conventionally, a level sensor is provided in the oil tank 8, but since the oil in the oil tank 8 is constantly circulated while the engine 2 is rotating, air bubbles are generated. , Another level sensor was lacking in reliability. Therefore, the oil tank 8
Since the charge pressure becomes zero when the oil in the inside is exhausted, if the pressure sensor 15 that measures the charge pressure detects that the charge pressure becomes zero, the CPU 1
It is configured so that the operator is notified by alert 20 by inputting in 9. As a result, it is possible to prevent seizure of the hydraulic drive device 1 in advance. Alternatively, a command may be issued to the engine stop circuit 21 to automatically stop the engine 2.

【0010】上述のごとき内容から、エンジン2の回転
数が低下すると、油圧駆動装置1内へのチャージ圧力が
低下してくるが、この低下したチャージ圧力に関連し
て、トランスミッション3内の伝動系を低速伝達手段5
に切り換え可能としたので、エンジン2の回転数を略一
定に保つことができる。さらに、走行装置以外の動力系
12にエンジン2からの動力を利用している場合、その
動力系を常に一定の回転数で回転させることができる。
特に、コンバインの場合脱穀系の回転数は常に一定の回
転数で回す必要があるが、これを確保でき、安定した作
業を行なうことができる。
From the above contents, when the rotation speed of the engine 2 is reduced, the charge pressure in the hydraulic drive system 1 is reduced, and the transmission system in the transmission 3 is associated with the reduced charge pressure. The low speed transmission means 5
Since it can be switched to, the rotational speed of the engine 2 can be kept substantially constant. Furthermore, when the power from the engine 2 is used for the power system 12 other than the traveling device, the power system can always be rotated at a constant rotation speed.
Particularly in the case of the combine, the threshing system must always rotate at a constant rotation speed, but this can be ensured and stable work can be performed.

【0011】[0011]

【発明の効果】本発明は上述のごとく、走行軸4に高負
荷がかかってエンジン2の回転数が低下してくると、チ
ャージポンプ9の回転数も低下してきて、油圧駆動装置
1にオイルを補給するチャージ圧力も低下してくるが、
これを利用してトランスミッション3内の伝動系を低速
伝達手段5に切り換えることのできる、切換手段7を設
けた構成とした。これにより、エンジン2の回転数は略
一定の回転で回り続けることができ、エンジン2の回転
を走行装置以外の動力系12に利用している場合、例え
ば、農業機械であるコンバインにおいては、脱穀伝動系
の安定した回転数を確保することができ、脱穀選別能力
に影響を与えず、安定した作業を行うことができる。
As described above, according to the present invention, when a high load is applied to the traveling shaft 4 and the rotation speed of the engine 2 decreases, the rotation speed of the charge pump 9 also decreases, and the hydraulic drive device 1 receives oil. The charge pressure to replenish
By utilizing this, the transmission system in the transmission 3 can be switched to the low speed transmission means 5 by providing the switching means 7. Accordingly, the rotation speed of the engine 2 can continue to rotate at a substantially constant rotation, and when the rotation of the engine 2 is used for the power system 12 other than the traveling device, for example, in a combine that is an agricultural machine, threshing is performed. A stable rotation speed of the transmission system can be ensured, and stable work can be performed without affecting the threshing selection ability.

【図面の簡単な説明】[Brief description of drawings]

【図1】伝動機構図[Fig. 1] Transmission mechanism diagram

【図2】油圧回路図[Fig. 2] Hydraulic circuit diagram

【図3】油圧回路図[Fig. 3] Hydraulic circuit diagram

【図4】伝動機構図[Fig. 4] Transmission mechanism diagram

【図5】ブロック図FIG. 5: Block diagram

【符号の説明】[Explanation of symbols]

1 油圧駆動装置 2 エンジン 3 トランスミッション 4 走行軸 5 低速伝達手段 6 高速伝達
手段 7 切換手段 8 オイルタ
ンク 9 チャージポンプ 10 油圧ポン
プ 10a 斜板 11 油圧モ
ータ 11a 油圧モータ出力軸 12 走行装
置以外の動力系 13 扱胴 14 処理胴 15 圧力センサ 16 クラッ
チ一速 17 クラッチ二速 18 クラッ
チ三速 19 中央処理装置(CPU) 20 アラー
ト 21 エンジン停止回路
1 hydraulic drive device 2 engine 3 transmission 4 traveling shaft 5 low speed transmission means 6 high speed transmission means 7 switching means 8 oil tank 9 charge pump 10 hydraulic pump 10a swash plate 11 hydraulic motor 11a hydraulic motor output shaft 12 power system other than traveling device 13 Handling cylinder 14 Processing cylinder 15 Pressure sensor 16 Clutch 1st speed 17 Clutch 2nd speed 18 Clutch 3rd speed 19 Central processing unit (CPU) 20 Alert 21 Engine stop circuit

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 エンジン2からの動力を、正逆転及び無
段変速が可能な油圧駆動装置1を介してトランスミッシ
ョン3に伝達し、且つ、前記トランスミッション3内に
は、走行軸4に動力を低速側と高速側とに切り換えて伝
達可能な低速伝達手段5,高速伝達手段6を有する走行
装置において、エンジン2で油圧駆動装置1の油圧モー
タ11駆動用の油圧ポンプ10及び油圧駆動装置1にオ
イルを補給するチャージポンプ9を駆動し、前記油圧モ
ータ11の出力軸11aはトランスミッション3と連結
し、更に、走行装置以外の動力系12にもエンジン2か
らの動力を伝達する構成とし、該チャージポンプ9のチ
ャージ圧力が設定値以下の低下に関連して、高速伝達手
段6の伝動状態から低速伝動手段5の伝動状態に切り換
える切換手段7を設けたことを特徴とする走行装置。
1. A motive power from an engine 2 is transmitted to a transmission 3 via a hydraulic drive device 1 capable of forward / reverse rotation and continuously variable transmission, and a low speed motive power is applied to a traveling shaft 4 in the transmission 3. In a traveling device having a low speed transmission means 5 and a high speed transmission means 6 capable of switching and transmitting between a high speed side and a high speed side, an oil is supplied to a hydraulic pump 10 and a hydraulic drive device 1 for driving a hydraulic motor 11 of a hydraulic drive device 1 by an engine 2. The charge pump 9 for replenishing the electric power is driven, the output shaft 11a of the hydraulic motor 11 is connected to the transmission 3, and the power from the engine 2 is transmitted to the power system 12 other than the traveling device. A switching means 7 for switching from the transmission state of the high-speed transmission means 6 to the transmission state of the low-speed transmission means 5 is provided in connection with the decrease in the charge pressure of 9 below the set value. A traveling device characterized by being struck.
JP14736594A 1994-06-29 1994-06-29 Travel device Pending JPH0814358A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14736594A JPH0814358A (en) 1994-06-29 1994-06-29 Travel device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14736594A JPH0814358A (en) 1994-06-29 1994-06-29 Travel device

Publications (1)

Publication Number Publication Date
JPH0814358A true JPH0814358A (en) 1996-01-16

Family

ID=15428573

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14736594A Pending JPH0814358A (en) 1994-06-29 1994-06-29 Travel device

Country Status (1)

Country Link
JP (1) JPH0814358A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002500741A (en) * 1998-03-27 2002-01-08 オー・ウント・カー・オレンシュタイン・ウント・コッペル・アクチェンゲゼルシャフト Method and apparatus for load-dependent switching of a hydraulic traveling drive of a self-propelled construction machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002500741A (en) * 1998-03-27 2002-01-08 オー・ウント・カー・オレンシュタイン・ウント・コッペル・アクチェンゲゼルシャフト Method and apparatus for load-dependent switching of a hydraulic traveling drive of a self-propelled construction machine

Similar Documents

Publication Publication Date Title
JP3941951B2 (en) Drive control device for hybrid work machine
JP2000001127A (en) Four wheel drive vehicle
JPH11350539A (en) Traveling aid hydraulic circuit of hydraulic drive working vehicle
KR970027980A (en) Power transmission device and its control method
US5785623A (en) Hydraulic/mechanical transmission
US20060207809A1 (en) Electric drive system having cooling strategy
JP2010133469A (en) Working vehicle
EP3959459A1 (en) Hydraulic circuit architecture with enhanced operating efficiency
JPH0814358A (en) Travel device
US7845168B2 (en) Method for controlling a powertrain
JP4330431B2 (en) Cooling fan control system
JP2000186758A (en) Hydraulic pressure supplying device for power transmission device
JPH11230307A (en) Driving device for plural hydraulic motor
EP1835205A2 (en) Hydraulic power transmission device
JP2011163048A (en) Device and method for controlling drive of construction machine
JP2000175307A (en) Driver for car
US10486522B2 (en) Hybrid work vehicle and hybrid work vehicle control method
JP2002255052A (en) Auxiliary machine drive device for vehicle
JP2001246965A (en) Vehicle with working unit mounted thereon
JPS61266868A (en) Hydraulic transmission device
JPH05169996A (en) Four-wheel drive vehicle
JP5125387B2 (en) Shift control device for work vehicle
KR100264561B1 (en) Automatic transmission control method
JPH0811592A (en) Controller of vehicle with hydraulic transmission
JPH0552226A (en) Control circuit for industrial vehicle