JPH0678050B2 - Work vehicle speed control device - Google Patents
Work vehicle speed control deviceInfo
- Publication number
- JPH0678050B2 JPH0678050B2 JP62330256A JP33025687A JPH0678050B2 JP H0678050 B2 JPH0678050 B2 JP H0678050B2 JP 62330256 A JP62330256 A JP 62330256A JP 33025687 A JP33025687 A JP 33025687A JP H0678050 B2 JPH0678050 B2 JP H0678050B2
- Authority
- JP
- Japan
- Prior art keywords
- prime mover
- hydraulic
- pipe
- actuator
- hydraulic pump
- 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
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
- Control Of Fluid Gearings (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、原動機とこれにより駆動される走行軸との間
の伝動系に静液圧変速機を介在させた作業用車両の速度
制御装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control device for a working vehicle in which a hydrostatic transmission is interposed in a transmission system between a prime mover and a traveling shaft driven by the prime mover.
従来技術 原動機と走行車輪との間に油圧ポンプと油圧モータとか
ら成る静油圧変速機を有する作業用車両は、作業時の負
荷に対する車速の制御が従来の機械式、トルクコンバー
タ式に比較し、容易かつ、確実であるが、車速を制御す
る要素が原動機の回転制御と上記の油圧ポンプ又は油圧
モーターの吐出量制御の２系統となり、従来の機械式、
トルクコンバータ式に比較し、構造が複雑となるのみな
らず、オペレータは作業又は回送時の各々の状況に応じ
て、リンケージ又は油圧回路による原動機の回転制御機
構と、油圧ポンプ又は油圧モータの吐出量制御機構との
互いに独立した２系統の操作を並行して行なう必要があ
り、操作も複雑になる欠点があった。Prior art work vehicle having a hydrostatic transmission consisting of a hydraulic pump and a hydraulic motor between the prime mover and the traveling wheels, the control of the vehicle speed with respect to the load during work is compared with the conventional mechanical type, torque converter type, It is easy and reliable, but the elements that control the vehicle speed are two systems, the rotation control of the prime mover and the discharge amount control of the hydraulic pump or hydraulic motor described above.
Compared to the torque converter type, the structure is not only complicated, but the operator can also adjust the rotation control mechanism of the prime mover by the linkage or hydraulic circuit and the discharge amount of the hydraulic pump or hydraulic motor, depending on the situation at the time of work or forwarding. It is necessary to perform two independent operations of the control mechanism in parallel with each other, and the operation is complicated.
発明の目的 本発明は、上記構成の従来の作業用車両の速度制御装置
の上記の欠点にかんがみ、構造が簡単で操作性の優れた
作業用車両の速度制御装置を提供することを目的とす
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a work vehicle speed control device having a simple structure and excellent operability, in view of the above-mentioned drawbacks of the conventional work vehicle speed control device having the above-described configuration. .
目的達成のための手段 本発明は、上記の目的を達成させるため、原動機とこれ
により駆動される走行輪との間の伝動系に、液圧ポンプ
と液圧モータとから成る静液圧変速機を介在させ、上記
の液圧ポンプ又は液圧モータの吐出量、吐出方向の制御
を圧力調整弁により圧力を調整された作動液によって制
御される制御弁により行なう作業用車両の速度制御装置
において、上記の圧力調整弁と制御弁との間の作動液配
管に、上記原動機の回転速度を制御するレバーに接続さ
れたアクチュエータに至る分岐管を設け、上記の制御用
の作動液を上記液圧ポンプ又は液圧モータの吐出量の増
減と上記原動機の回転数の増減とが連動するように上記
アクチュエータに導き、これにより原動機の回転速度を
制御するとともに、上記の分岐管は該管を開閉する手段
を有し、該手段により管を閉鎖することにより、該手段
とアクチュエータの間の管内空間を密閉し、アクチュエ
ータの作動を保持し、原動機の回転を一定とするように
したことを特徴とする。Means for Achieving the Object In order to achieve the above object, the present invention provides a hydrostatic transmission including a hydraulic pump and a hydraulic motor in a transmission system between a prime mover and traveling wheels driven by the prime mover. In the speed control device for a working vehicle, the discharge amount and discharge direction of the hydraulic pump or the hydraulic motor are controlled by a control valve controlled by a hydraulic fluid whose pressure is adjusted by a pressure adjusting valve. The hydraulic fluid pipe between the pressure regulating valve and the control valve is provided with a branch pipe leading to an actuator connected to a lever that controls the rotation speed of the prime mover, and the hydraulic fluid for control is used for the hydraulic pump. Alternatively, the increase / decrease in the discharge amount of the hydraulic motor and the increase / decrease in the rotational speed of the prime mover are guided to the actuator so as to control the rotational speed of the prime mover, and the branch pipe opens and closes the pipe. It is characterized in that it has means, and by closing the pipe by the means, the space inside the pipe between the means and the actuator is sealed, the operation of the actuator is held, and the rotation of the prime mover is made constant. .
実施例の説明 以下に本発明の作用を図面に示す実施例に基づいて詳細
に説明する。Description of Embodiments The operation of the present invention will be described in detail below based on the embodiments shown in the drawings.
第１図は、本発明の一実施例の回路図である。FIG. 1 is a circuit diagram of an embodiment of the present invention.
原動機20と走行軸21との間の伝動系には、油圧ポンプ１
及び油圧モータ２とからなる静油圧変速機22が設けられ
ている。油圧ポンプ11は吐出量可変ポンプであり、その
吐出量及び吐出方向を制御する油圧源である小形ポンプ
３から吐出された油は配管４を通り、圧力調整弁５に導
かれる。圧力調整弁の吐出口は、更に油圧ポンプ１の吐
出量、吐出方向を制御するコントロールバルブ10に２本
の配管８を介して接続されている。配管８を通る油の圧
力は、圧力調整弁５に接続されたペダル６を踏み込むこ
とによりレバー７の傾斜角θを増減することにより増減
し、油圧ポンプ１の吐出量が増減し、車速が増減する。A hydraulic pump 1 is provided in the transmission system between the prime mover 20 and the traveling shaft 21.
Further, a hydrostatic transmission 22 including a hydraulic motor 2 is provided. The hydraulic pump 11 is a variable discharge amount pump, and the oil discharged from the small pump 3, which is a hydraulic pressure source for controlling the discharge amount and the discharge direction, is guided to the pressure adjusting valve 5 through the pipe 4. The discharge port of the pressure regulating valve is further connected to a control valve 10 for controlling the discharge amount and the discharge direction of the hydraulic pump 1 via two pipes 8. The pressure of the oil passing through the pipe 8 is increased / decreased by depressing the pedal 6 connected to the pressure regulating valve 5 to increase / decrease the inclination angle θ of the lever 7, and the discharge amount of the hydraulic pump 1 is increased / decreased to increase or decrease the vehicle speed. To do.
又、車両の前進、後進の切換は２本の配管８の途中に設
けられた電磁切換弁９を切換スイッチ11により配線12を
介して切換ることにより、油圧ポンプの吐出方向を逆転
させて行なう。Further, the forward / reverse switching of the vehicle is performed by reversing the discharge direction of the hydraulic pump by switching the electromagnetic switching valve 9 provided in the middle of the two pipes 8 by the switching switch 11 via the wiring 12. .
さらに本発明では、上記の配管８から分岐した配管13を
原動機の回転制御アクチュエータ（シリンダ）14に接続
し、ペダル６を踏み込むことにより配管13に導かれた油
圧が増減し、シリンダ14に組込まれたバネ15のバネ力と
油圧が均衡した状態で原動機回転制御用レバー16が保持
された原動機の回転はペダル６の踏み角θに追従した制
御が可能となる。Further, in the present invention, the pipe 13 branched from the above pipe 8 is connected to the rotation control actuator (cylinder) 14 of the prime mover, and when the pedal 6 is depressed, the hydraulic pressure introduced to the pipe 13 is increased or decreased to be incorporated in the cylinder 14. The rotation of the prime mover, which is held by the prime mover rotation control lever 16 in a state where the spring force of the spring 15 and the hydraulic pressure are balanced, can be controlled so as to follow the pedaling angle θ of the pedal 6.
また、配管８より分岐された制御配管13に電磁切換弁17
を挿入しスイッチ18により配線19を介して、切換弁17を
閉じ、この弁とシリンダ14の間の配管内の油を密閉し原
動機の回転を固定制御することを可能とした。In addition, an electromagnetic switching valve 17 is connected to the control pipe 13 branched from the pipe 8.
Then, the switch 18 was closed by the switch 18 via the wiring 19, the oil in the pipe between the valve and the cylinder 14 was sealed, and the rotation of the prime mover could be fixedly controlled.
尚、上記の構成でペダル６をハンドルレバー、電磁切換
弁９を手動式切換弁、電磁切換弁17を手動式切換弁又は
止め弁としても良い。In the above structure, the pedal 6 may be a handle lever, the electromagnetic switching valve 9 may be a manual switching valve, and the electromagnetic switching valve 17 may be a manual switching valve or a stop valve.
又、上記実施例では静油圧変速機を構成する油圧ポンプ
と油圧モータのうち油圧ポンプを吐出量可変としたが、
油圧ポンプを定容量ポンプとして、油圧モータを可変容
量モータとしてもよい。Further, in the above embodiment, the hydraulic pump of the hydrostatic transmission and the hydraulic motor of the hydraulic motor has a variable discharge amount.
The hydraulic pump may be a constant displacement pump and the hydraulic motor may be a variable displacement motor.
効 果 以上説明したように、従来独立で設けられていた、リン
ケージ又は流体圧回路による原動機回転制御機構を流体
圧変速機を構成する流体圧ポンプ又は流体圧モータを制
御する回路から作動流体を分岐させ、原動機の回転を制
御するアクチュエータに導く回路に変更することによ
り、複雑なリンケージを単純な流体圧モータを制御する
回路と一部共用することにより、構造の簡易化を図るこ
とができ、コスト低減に寄与する。Effect As described above, the working fluid is branched from the circuit that controls the fluid pressure pump or fluid pressure motor that configures the fluid pressure transmission by using the linkage or fluid pressure circuit, which is the independent mechanism, to control the rotation of the motor. By changing the circuit that leads to the actuator that controls the rotation of the prime mover, part of the complicated linkage is shared with the circuit that controls the simple fluid pressure motor, which simplifies the structure and reduces the cost. Contribute to reduction.
又、従来互いに独立していた原動機の回転制御機構と流
体圧ポンプ又は流体圧モータの吐出量制御機構とを一系
統にしたことにより車両の速度制御操作が容易になり、
疲労が軽減し、安全走行が図られる。その結果、オペレ
ータは作業装置の繁雑なレバー及びペダル等の操作に専
念できることにより作業の効率化が図れると共に、車両
の周囲にも注意がゆきとどき安全性の向上にも寄与す
る。Further, since the rotation control mechanism of the prime mover and the discharge amount control mechanism of the fluid pressure pump or the fluid pressure motor, which are conventionally independent of each other, are integrated into one system, the speed control operation of the vehicle becomes easy,
Fatigue is reduced and safe driving is achieved. As a result, the operator can concentrate on the complicated operations of the levers and pedals of the work device, thereby improving the work efficiency and paying attention to the surroundings of the vehicle, which contributes to the improvement of safety.
第１図は本発明の一実施例の速度制御装置の回路図であ
る。 １……静油圧変速機用油圧ポンプ ２……静油圧変速機用油圧モータ ３……静油圧変速機制御用油圧ポンプ ４……油圧配管 ５……圧力調整弁 ６……ペダル ７……レバー ８……油圧配管 ９……切換弁 10……コントロール・バルブ 11……切換スイッチ 12……電気配線 13……油圧配管 15……バネ 16……原動機の回転制御用レバー 17……切換弁（開閉手段） 18……切換スイッチ 19……電気配線 20……原動機 21……走行輪 22……静油圧変速機FIG. 1 is a circuit diagram of a speed control device according to an embodiment of the present invention. 1 …… Hydraulic pump for hydrostatic transmission 2 …… Hydraulic motor for hydrostatic transmission 3 …… Hydraulic pump for hydrostatic transmission control 4 …… Hydraulic piping 5 …… Pressure adjusting valve 6 …… Pedal 7 …… Lever 8 ...... Hydraulic piping 9 ...... Switching valve 10 ...... Control valve 11 ...... Switching switch 12 ...... Electrical wiring 13 ...... Hydraulic piping 15 ...... Spring 16 ...... Lever for controlling rotation of prime mover 17 ...... Switching valve (opening and closing Means) 18 ... Changeover switch 19 ... Electrical wiring 20 ... Motor 21 ... Running wheel 22 ... Hydrostatic transmission
Claims (1)
間の伝動系に、液圧ポンプと液圧モータとから成る静液
圧変速機を介在させ、上記の液圧ポンプ又は液圧モータ
の吐出量、吐出方向の制御を圧力調整弁により圧力を調
整された作動液によって制御される制御弁により行なう
作業用車両の速度制御装置において、上記の圧力調整弁
と制御弁との間の作動液配管に、上記原動機の回転速度
を制御するレバーに接続されたアクチュエータに至る分
岐管を設け、上記の制御用の作動液を上記液圧ポンプ又
は液圧モータの吐出量の増減と上記原動機の回転数の増
減とが連動するように上記アクチュエータに導き、これ
により原動機の回転速度を制御するとともに、上記の分
岐管は該管を開閉する手段を有し、該手段により管を閉
鎖することにより、該手段とアクチュエータの間の管内
空間を密閉し、アクチュエータの作動を保持し、原動機
の回転を一定とするようにしたことを特徴とする作業用
車両の速度制御装置。1. A hydraulic pump or hydraulic motor as defined above, wherein a hydrostatic transmission comprising a hydraulic pump and a hydraulic motor is interposed in a transmission system between a prime mover and traveling wheels driven by the prime mover. In the speed control device for the working vehicle, in which the discharge amount and the discharge direction are controlled by the control valve controlled by the hydraulic fluid whose pressure is adjusted by the pressure adjusting valve, the operation between the pressure adjusting valve and the control valve is performed. The liquid pipe is provided with a branch pipe leading to an actuator connected to a lever for controlling the rotation speed of the prime mover, and the control hydraulic fluid is increased or decreased in the discharge amount of the hydraulic pump or hydraulic motor and the prime mover. By guiding the actuator to increase / decrease in the number of revolutions in parallel, thereby controlling the rotational speed of the prime mover, the branch pipe has means for opening and closing the pipe, and by closing the pipe by the means. Sealing the tube space between said means and the actuator to hold the operation of the actuator, the speed control device for a working vehicle, characterized in that so as to rotation of the prime mover is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62330256A JPH0678050B2 (en) | 1987-12-28 | 1987-12-28 | Work vehicle speed control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62330256A JPH0678050B2 (en) | 1987-12-28 | 1987-12-28 | Work vehicle speed control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01175533A JPH01175533A (en) | 1989-07-12 |
| JPH0678050B2 true JPH0678050B2 (en) | 1994-10-05 |
Family
ID=18230606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62330256A Expired - Lifetime JPH0678050B2 (en) | 1987-12-28 | 1987-12-28 | Work vehicle speed control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0678050B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0516454U (en) * | 1991-08-13 | 1993-03-02 | 株式会社日本除雪機製作所 | Vehicle speed control device for rotary snowplow |
| JP4040492B2 (en) | 2003-02-24 | 2008-01-30 | 株式会社クボタ | Work vehicle travel control device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5922105B2 (en) * | 1975-06-30 | 1984-05-24 | 隆之 宮尾 | Control method of continuously variable transmission |
-
1987
- 1987-12-28 JP JP62330256A patent/JPH0678050B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01175533A (en) | 1989-07-12 |
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