JPS5837367A - Controller for variable capacity type oil-pressure pump in oil-pressure close circuit driver - Google Patents
Controller for variable capacity type oil-pressure pump in oil-pressure close circuit driverInfo
- Publication number
- JPS5837367A JPS5837367A JP56134620A JP13462081A JPS5837367A JP S5837367 A JPS5837367 A JP S5837367A JP 56134620 A JP56134620 A JP 56134620A JP 13462081 A JP13462081 A JP 13462081A JP S5837367 A JPS5837367 A JP S5837367A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- hydraulic pump
- switching valve
- operating lever
- pressure
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Fluid Gearings (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、たとえば油圧ショベルの走行装置のような
油圧閉回路駆動装置における可変容量形油圧ポンプの制
御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a variable displacement hydraulic pump in a hydraulic closed circuit drive device such as a traveling device of a hydraulic excavator.
つぎに、操作レバーの操作位置に応じて可変容量杉油圧
ポンプの吐出量を制御するサーボバルブと、前記油圧ポ
ンプの吐出圧に応じて吐出量を増減して吐出馬力を制御
する装置とをそなえた従来の油圧閉回路駆動装置の一例
を第１図により説明する。Next, a servo valve that controls the discharge amount of the variable displacement cedar hydraulic pump according to the operating position of the operating lever, and a device that increases or decreases the discharge amount according to the discharge pressure of the hydraulic pump to control the discharge horsepower. An example of a conventional hydraulic closed circuit drive device will be explained with reference to FIG.
可変容量杉油圧ポンプ（以下主油圧ポンプという）２と
補給油圧ポンプ３とはエンジンｌに直結されており、主
油圧ポンプ２と油圧モータ４とは閉回路５Ａ、５Ｂによ
りたがいにつらねられている。補給油圧ポンプ３の吸込
がわは油タンク２４に接続されており、吐出がわは逆止
め弁２５Ａ１２５Ｂを介してそれぞれ閉回路５Ａ、５Ｂ
につらねられているとともに、管路６を介して切替弁７
に接続され、リリーフ弁２６を介して油タンク２４に接
続されている。切替弁７のスプールの受圧部は、閉回路
５Ａ、５Ｂとの間に設けたシャトル弁２７につらねられ
ている。切替弁７の切替ポートは切替弁８に接続されて
おり、切替弁７．８の戻り管路はそれぞれ油タンク１５
．２３に接続されている。The variable capacity cedar hydraulic pump (hereinafter referred to as the main hydraulic pump) 2 and the supplementary hydraulic pump 3 are directly connected to the engine 1, and the main hydraulic pump 2 and the hydraulic motor 4 are connected to each other by closed circuits 5A and 5B. . The suction side of the replenishment hydraulic pump 3 is connected to the oil tank 24, and the discharge side is connected to closed circuits 5A and 5B via check valves 25A and 25B, respectively.
A switching valve 7 is connected to the switching valve 7 via a conduit 6.
and is connected to the oil tank 24 via a relief valve 26. The pressure receiving portion of the spool of the switching valve 7 is suspended from a shuttle valve 27 provided between the closed circuits 5A and 5B. The switching port of the switching valve 7 is connected to the switching valve 8, and the return pipes of the switching valve 7.8 are connected to the oil tank 15, respectively.
．． It is connected to 23.
切替弁８の切替ポートは管路”ｌＡ％１１Ｂを介してサ
ーボシリング１２のロッド室Ａ、ヘッド室Ｂにつらねら
れており、切替弁８のスプールはＩＪ ７ ’７１０の
一端に連結されている。リンク１０の中間支点１３は操
作レバー９に連結され、他端はサーボシリンダ゛１２の
ピストンロッドに連結されこおす、ピストンロッドはベ
ルクランク２８を介して主油圧ポンプ２の傾転角操作機
構に連結されている。The switching port of the switching valve 8 is connected to the rod chamber A and head chamber B of the servo sill 12 via the pipe line "lA%11B," and the spool of the switching valve 8 is connected to one end of the IJ7'710. The intermediate fulcrum 13 of the link 10 is connected to the operating lever 9, and the other end is connected to the piston rod of the servo cylinder 12.The piston rod is connected to the tilting angle operating mechanism of the main hydraulic pump 2 via the bell crank 28. is connected to.
一方、サーボシリンダ１２のピストンロッドは、甲間部
を支持ブラケットに支持させたリンク１７の一端に連結
されており、ＩＪシンク７の他端はベルクランク１９を
揺動させるカム１８に連結されている。ベルクランク１
９の反カムがわの端部は切替弁７の外筒に連結されてい
る。切替弁７の受圧部の反対がわにはばね１４が設けら
れており、サーボシリン４”１２のロッド室Ｂにはそれ
ぞればね１６Ａ、１６Ｂがおさめられている。On the other hand, the piston rod of the servo cylinder 12 is connected to one end of a link 17 whose instep part is supported by a support bracket, and the other end of the IJ sink 7 is connected to a cam 18 that swings a bell crank 19. There is. bell crank 1
The opposite end of the cam 9 is connected to the outer cylinder of the switching valve 7. A spring 14 is provided on the opposite side of the pressure receiving portion of the switching valve 7, and springs 16A and 16B are housed in the rod chamber B of the servo cylinder 4''12, respectively.
エンジンｌを駆動すれば、主油圧ポンプ２の吐出油が油
圧モニタ４に供給され、補給油圧ポンプ３の吐出油は、
逆止め弁２５人、または２５Ｂを経て閉回路５Ａ、５Ｈ
の低圧がわに補給されるとともに、管路６、切替弁７を
経て切替弁８に通じる。When the engine l is driven, the oil discharged from the main hydraulic pump 2 is supplied to the oil pressure monitor 4, and the oil discharged from the supplementary hydraulic pump 3 is
Closed circuit 5A, 5H via check valve 25 or 25B
The low-pressure water is supplied to the low pressure side of the tank, and it also communicates with the switching valve 8 via the pipe line 6 and the switching valve 7.
操作レバー９を揺動させると、リンクｌＯが連動して切
替弁８が切替えられ、補給油圧ポンプ３からの吐出油は
管路１１Ａ、または１１Ｂを経てサーボシリンダ１２に
供給され、そのピストンおよびベルクランク２８が作動
して、主油圧ポンプ２の傾転角が変えられ、主油圧ポン
プ２の吐出量が増大し、または減少する。サーボシリン
ダ１２の作動にともなって、リンク１０は中間支点１３
を支点として揺動し、切替弁８を作動させる。この切替
弁８が閉じるまで、補給油圧ポンプ３ｖ）らの圧油がサ
ーボシリンダ゛１２に供給されることになる。すなわち
、運転者は操作レバー９を介して切替弁８を切替えるだ
けの小さな力で、主油圧ポンプ２の吐出量を任意に制御
することができる。When the operating lever 9 is swung, the link IO is interlocked to switch the switching valve 8, and the oil discharged from the replenishment hydraulic pump 3 is supplied to the servo cylinder 12 via the pipe 11A or 11B, and the piston and bell are The crank 28 is operated to change the tilt angle of the main hydraulic pump 2, increasing or decreasing the discharge amount of the main hydraulic pump 2. With the operation of the servo cylinder 12, the link 10 moves to the intermediate fulcrum 13.
The switching valve 8 is actuated by swinging around the fulcrum. Until this switching valve 8 is closed, pressure oil from the supplementary hydraulic pump 3v) is supplied to the servo cylinder 12. That is, the driver can arbitrarily control the discharge amount of the main hydraulic pump 2 with just a small force of switching the switching valve 8 via the operating lever 9.
切替弁７には油圧モータ４への油圧ポンプ吐出圧が導力
１れ、切替弁７はばね１４でセットされた力に応じて切
替る。切替弁７が切替ると、サーボシリンダ１２の管路
１１Ａ％１１Ｂのうちの給油がわの管路は、操作レバー
９の操作位置に関係なく、油タンク１５への戻り管路に
通じる。他方の排油がわの管路は油タンク２３につらな
っているので、主油圧ポンプ２の傾転位置は、サーボシ
リング１２内のばね１６Ａ％１６Ｂにより、零位置に戻
り、主油圧ポンプ２の吐出量が零になる。それにともな
って、リンク１７、カム１８、ベルクランク１９を介し
て切替弁７の外筒部が、主油圧ポンプ２の傾転位置に対
して移動し、切替弁７の切替り位置゛を変える。したが
って、主油圧ポンプ２の吐出量は、ばね１４とカム１８
により吐出圧に応じて変り、ポンプの吐出馬力制御がな
される油圧ショベル等においては、連続走行の場合にも
、路面の状況、障害物などに対応して、減速、または停
止を組み入れて走行をする。したがって、上述のような
閉回路駆動による走行車両では、走行途中で、運転者は
操作し・イーを頻繁に中立に戻す操作をすることになり
、煩雑である。A hydraulic pump discharge pressure to the hydraulic motor 4 is applied to the switching valve 7, and the switching valve 7 is switched according to a force set by a spring 14. When the switching valve 7 is switched, the oil supply side pipe among the pipes 11A and 11B of the servo cylinder 12 communicates with the return pipe to the oil tank 15, regardless of the operating position of the operating lever 9. Since the other drain pipe is connected to the oil tank 23, the tilting position of the main hydraulic pump 2 is returned to the zero position by the spring 16A% 16B in the servo sill 12, and the main hydraulic pump 2 is returned to the zero position. The discharge amount becomes zero. Along with this, the outer cylindrical portion of the switching valve 7 moves relative to the tilted position of the main hydraulic pump 2 via the link 17, the cam 18, and the bell crank 19, changing the switching position of the switching valve 7. Therefore, the discharge amount of the main hydraulic pump 2 is determined by the spring 14 and the cam 18.
Hydraulic excavators, etc., which control the discharge horsepower of the pump by changing the discharge pressure depending on the discharge pressure, can slow down or stop in response to road conditions, obstacles, etc. even when running continuously. do. Therefore, in the closed-circuit drive vehicle as described above, the driver has to frequently operate the vehicle to return the vehicle to the neutral position while the vehicle is running, which is cumbersome.
この発明は、上記の欠点を除くことができる油圧閉回路
駆動装置における可変容量形油圧ポンプの制御装置を提
供することを目的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a control device for a variable displacement hydraulic pump in a hydraulic closed circuit drive device that can eliminate the above-mentioned drawbacks.
以下、この発明の一実施態様を第２図および第３図によ
り説明する。両図において、第１図と同じ符号をつけた
ものは、同じものを表わす。Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 and 3. In both figures, the same reference numerals as in FIG. 1 represent the same things.
操作レバー９は、デテント装置２０の制御用溝にはめこ
まれており、中立位置Ｎ、前進位置Ｆ。The operating lever 9 is fitted into a control groove of the detent device 20 and has a neutral position N and a forward position F.
後進位置Ｒに制止させておくことができるようになって
いる。切替弁７のスプールは、これを任意に切替える操
作手段、たとえばペブル２１にロッド２２を介して連結
されている。その他は、第１図のものと同様である。The vehicle can be stopped at the reverse position R. The spool of the switching valve 7 is connected via a rod 22 to an operating means, such as a pebble 21, for switching the spool as desired. The other parts are the same as those in FIG.
操作レバー９を、たとえば前進位置Ｆに揺動させると、
補給油圧ポンプ３からの圧油は、ベタ゛ル２１が踏込ま
れない場合には、第２図の状態の切替弁７、第３図の状
態の切替弁８を経て、サーボシリンダ１２のロッド室人
に送られる。そしてす−ポジリンダ１２により主油圧ポ
／ブ２の傾転角が変えられ、主油圧ポンプ２はその傾転
角に応じた油讐を吐出する。For example, when the operating lever 9 is swung to the forward position F,
When the bevel 21 is not depressed, the pressure oil from the replenishment hydraulic pump 3 passes through the switching valve 7 in the state shown in FIG. 2 and the switching valve 8 in the state shown in FIG. Sent. Then, the tilting angle of the main hydraulic pump 2 is changed by the positive cylinder 12, and the main hydraulic pump 2 discharges oil according to the tilting angle.
この状態で、ベタール２１を踏込むと、切替弁７が第３
図の状態に切替えられ、補給油圧ポンプ３からの圧油は
、切替弁７で遮断され、サーボシリンダ゛１２のロッド
室Ａがわの管路１１Ａは、切替弁８、切替弁７を介して
油タンク１５への戻ね管路につらねられる。一方、サー
ボシリンダ１２のへンド室Ｂがわの管路１１Ｂは、切替
弁８により油タンク２３への戻り管路につらなっている
ので、サーボシリンダ１２は自由な状態きなる０したが
って、ばね１６Ａ％１６Ｂが平衡する位置、すなわち、
中立位置、いいかえれば傾転負零の位置に主油圧ポｙプ
２の斜板が引き戻される。よって、吐出量は零となり、
車両は停止する。In this state, when you step on the betaru 21, the switching valve 7 will switch to the third position.
The state is switched to the state shown in the figure, the pressure oil from the replenishment hydraulic pump 3 is cut off by the switching valve 7, and the pipe 11A next to the rod chamber A of the servo cylinder 12 is routed through the switching valve 8 and the switching valve 7. It is suspended in a return pipe to the oil tank 15. On the other hand, the pipe line 11B on the side of the hand chamber B of the servo cylinder 12 is connected to the return pipe line to the oil tank 23 by the switching valve 8, so the servo cylinder 12 is in a free state. The position where 16A%16B is in equilibrium, that is,
The swash plate of the main hydraulic pressure pump 2 is pulled back to the neutral position, in other words, to the position where the tilt is negative zero. Therefore, the discharge amount becomes zero,
The vehicle stops.
操作レバー９がデテント装＃ｔ２０により、たとんば前
進位置Ｆに制止されている場合でも、ペダル２１を踏込
むことで車両は停止し、また、ペダル２１の踏込みを解
くことで車両は前進する。Even if the operating lever 9 is stopped at the front forward position F by the detent device #t20, depressing the pedal 21 will stop the vehicle, and releasing the pedal 21 will cause the vehicle to move forward. .
レバーの操作位置に全く関係なく、ペダルなどの他の操
作手段を介して主油圧ポンプの吐出量を減らし、走行速
度を減速し、または車両を停止させることができる。し
かも、主油圧ポンプの吐出馬力制御装置の有効な使用に
より、安価に目的を達成できる。Regardless of the operating position of the lever, it is possible to reduce the output of the main hydraulic pump, reduce the traveling speed, or stop the vehicle via other operating means such as a pedal. Furthermore, by effectively using the discharge horsepower control device of the main hydraulic pump, the objective can be achieved at low cost.
１１１図は従来の油圧閉回路駆動装置における可変容量
形油圧ポンプの制御装置を示す系統図、第２図および第
３図はこの発明の一実施態様を示す系統図である。
１・番エンジン、 ２・・可変容量形油圧ポンプ、
３・・補給油圧ポンプ、 ４ｅ＃油圧モータ
、 ５Ａ、５Ｂ＠・閉回路、７・・切替弁、 ８・
・切替弁、 ９・−操作レバー、 １０−・リン
ク、
１１Ａ、１ＩＢＩＩ１１管路、 １２・１サーボシリ
ンダ、 １３−・中間支点、 １４・−ばね、
１６Ａ、１６Ｂ・・ばね、
１７・・りン〃、 １Ｂ−−カム、１９・・ベルク
ランク、 ２０１１・デテント装置、 ２】−
・ペダル、 ２２＠−口・ノド、２５Ａ、２５Ｂ・
・逆止め弁、 ２６・・リリーフ弁、 ２７・
・シャトル弁、
２８・・ペル〃ランク
第２図
第３図
２４ ２４FIG. 111 is a system diagram showing a control device for a variable displacement hydraulic pump in a conventional hydraulic closed circuit drive device, and FIGS. 2 and 3 are system diagrams showing an embodiment of the present invention. 1. Engine, 2.. Variable displacement hydraulic pump,
3.Replenishment hydraulic pump, 4e#hydraulic motor, 5A, [email protected] circuit, 7.Switching valve, 8.
-Switching valve, 9-operation lever, 10-link, 11A, 1IBII11 conduit, 12-1 servo cylinder, 13-intermediate fulcrum, 14-spring,
16A, 16B...Spring, 17...Rin, 1B--Cam, 19...Bell crank, 2011-Detent device, 2]-
・Pedal, 22@-mouth/throat, 25A, 25B・
・Check valve, 26.・Relief valve, 27.
・Shuttle valve, 28...Pel rank Fig. 2 Fig. 3 24 24
Claims (1)
吐出量を制御するサーボバルブと、前記油圧ポンプの吐
出圧に応じて吐出量を増減して吐出馬力を制御する装置
とをそなえた油圧閉回路駆動装置において、操作レバー
を操作位置に制止させるデテント装置を設け、吐出圧に
応じて作動する制御流量切替スプールに、外部Ｄ１ら、
吐出圧に無関係に切替えを行うことができる操作手段を
連結したことを特徴とする可変容量杉油圧ポンプの制御
装置。A hydraulic closed valve equipped with a servo valve that controls the discharge amount of a variable displacement cedar hydraulic pump according to the operating position of the operating lever, and a device that increases or decreases the discharge amount according to the discharge pressure of the hydraulic pump to control the discharge horsepower. In the circuit drive device, a detent device is provided to stop the operating lever in the operating position, and external D1, etc. are connected to the control flow rate switching spool that operates according to the discharge pressure.
A control device for a variable capacity cedar hydraulic pump, characterized in that it is connected to an operating means that can perform switching regardless of discharge pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56134620A JPS5837367A (en) | 1981-08-27 | 1981-08-27 | Controller for variable capacity type oil-pressure pump in oil-pressure close circuit driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56134620A JPS5837367A (en) | 1981-08-27 | 1981-08-27 | Controller for variable capacity type oil-pressure pump in oil-pressure close circuit driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5837367A true JPS5837367A (en) | 1983-03-04 |
Family
ID=15132637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56134620A Pending JPS5837367A (en) | 1981-08-27 | 1981-08-27 | Controller for variable capacity type oil-pressure pump in oil-pressure close circuit driver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5837367A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6275109A (en) * | 1985-09-30 | 1987-04-07 | Shin Meiwa Ind Co Ltd | Output variable type electrically driven actuator device |
| JPS63114940A (en) * | 1986-10-31 | 1988-05-19 | Nkk Corp | Silicon steel sheet excellent in surface characteristic and its production |
| JP2013096449A (en) * | 2011-10-28 | 2013-05-20 | Kubota Corp | Working vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51149630A (en) * | 1975-06-10 | 1976-12-22 | Clark Equipment Co | Control apparatus for hydrostatic power transmitting system |
-
1981
- 1981-08-27 JP JP56134620A patent/JPS5837367A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51149630A (en) * | 1975-06-10 | 1976-12-22 | Clark Equipment Co | Control apparatus for hydrostatic power transmitting system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6275109A (en) * | 1985-09-30 | 1987-04-07 | Shin Meiwa Ind Co Ltd | Output variable type electrically driven actuator device |
| JPS63114940A (en) * | 1986-10-31 | 1988-05-19 | Nkk Corp | Silicon steel sheet excellent in surface characteristic and its production |
| JPH0518900B2 (en) * | 1986-10-31 | 1993-03-15 | Nippon Kokan Kk | |
| JP2013096449A (en) * | 2011-10-28 | 2013-05-20 | Kubota Corp | Working vehicle |
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