JPS5934082B2 - Work equipment lifting device for towing vehicles - Google Patents
Work equipment lifting device for towing vehiclesInfo
- Publication number
- JPS5934082B2 JPS5934082B2 JP3125278A JP3125278A JPS5934082B2 JP S5934082 B2 JPS5934082 B2 JP S5934082B2 JP 3125278 A JP3125278 A JP 3125278A JP 3125278 A JP3125278 A JP 3125278A JP S5934082 B2 JPS5934082 B2 JP S5934082B2
- Authority
- JP
- Japan
- Prior art keywords
- check valve
- valve
- hydraulic cylinder
- oil
- 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.)
- Expired
Links
Landscapes
- Lifting Devices For Agricultural Implements (AREA)
- Fluid-Pressure Circuits (AREA)
Description
【発明の詳細な説明】
この発明は、トラクターやコンバイン等の油圧式作業機
昇降装置を有する牽引車輛の油圧回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic circuit for a towing vehicle such as a tractor or combine harvester having a hydraulic working machine lifting device.
一般に、油圧回路の高圧配管途中には油圧ポンプで発生
した高圧油を油圧シリンダーへ送り込んだりタンクへ戻
す様に切替えるメインスプールを有している。Generally, a main spool is provided midway through the high-pressure piping of the hydraulic circuit, which switches the high-pressure oil generated by the hydraulic pump to be sent to the hydraulic cylinder or returned to the tank.
そして、メインスプールは手動レバーにて操作する為軽
（作動させるようにコントロールバルブとスプールの間
隙を大きくしているが、このため油圧シリンダーの内圧
による戻り油が該間隙からタンク内に逃げて油圧ポンプ
停止時には吊り上げた作業機が自然降下する不具合を有
していた。The main spool is operated by a manual lever, so the gap between the control valve and the spool is made large so that the main spool can be operated with a manual lever, but because of this, the return oil due to the internal pressure of the hydraulic cylinder escapes into the tank from the gap, causing the oil pressure to increase. There was a problem in which the lifted work equipment would naturally descend when the pump stopped.
このため近年、この上昇した作業機の下降を防止するた
めロック弁を設けたり上昇位置保持弁を設けたりしてい
るが、田ツク弁は油圧ポンプを停止する毎に油圧回路を
ロックしなければならず面倒なため操作しない場合が多
く、作業機の下方で作業をしていて落下した作業機の下
敷になったり又、保持弁を有する回路では油圧ポンプを
停止した状態で作業機を降下させようと操作レバーを下
げに操作しても作業機はその位置を保持したままであり
下がらず、次に油圧ポンプを作動させた途端に操作レバ
ーが下げ位置になっていると作業機が落下し非常に危険
であった。For this reason, in recent years, lock valves and raised position holding valves have been installed to prevent the raised working equipment from descending, but the Tatsuku valve requires that the hydraulic circuit be locked every time the hydraulic pump is stopped. In many cases, people do not operate this because it is troublesome and they are working below the machine and end up trapped under the machine when it falls.Also, in a circuit with a holding valve, the machine is lowered with the hydraulic pump stopped. Even if you try to lower the control lever, the work equipment will remain in that position and will not go down, and the next time you operate the hydraulic pump, if the control lever is in the lower position, the work equipment will fall. It was extremely dangerous.
このような不具合を解消する為、本発明は次の様な技術
的手段を講じた。In order to eliminate such problems, the present invention has taken the following technical measures.
即ち、作業機昇降用油圧シリンダ−１と油圧ポンプ２と
の間に「上」・「下」・「中位」位置を有する昇降制御
用メインスプール３を設け、該メインスプール３と前記
油圧シリンダー１との間には、油圧シリンダー１からの
戻り油を制御する逆止弁４を設け、この逆止弁４はその
背圧室２０の油が排出されると逆止弁４の出口方向から
の圧力で逆流可能に構成され、逆止弁４とメインスプー
ル３との間には、油圧ポンプ２の作動中であって〜かつ
メインスプール３が「下」位置にあるときに上記逆止弁
４の背圧室２０の油がタンク２２にドレンされて油圧シ
リンダー１内の圧油がタンク２２に排出されるように作
動する先行弁５を設け、また、この先行弁５は、油圧ポ
ンプ２の停止中であって、油圧昇降用の手動レバー２５
とは別の操作部材γを操作することによって上記逆止弁
４を逆流可能に連動構成してあることを特徴とする牽引
車輛における作業機持上げ装置の構造とした。That is, a main spool 3 for lifting/lowering control having "upper", "lower", and "middle" positions is provided between the hydraulic cylinder 1 for lifting and lowering the working machine and the hydraulic pump 2, and A check valve 4 for controlling return oil from the hydraulic cylinder 1 is provided between the hydraulic cylinder 1 and the hydraulic cylinder 1, and when the oil in the back pressure chamber 20 is discharged, a check valve 4 is provided between the hydraulic cylinder 1 and the The check valve 4 and the main spool 3 are configured to allow backflow at a pressure of A preceding valve 5 is provided which operates so that the oil in the back pressure chamber 20 of the hydraulic cylinder 1 is drained to the tank 22 and the pressure oil in the hydraulic cylinder 1 is discharged to the tank 22. is stopped, and the manual lever 25 for hydraulic lifting
The structure of the work equipment lifting device for a towing vehicle is characterized in that the check valve 4 is interlocked to allow reverse flow by operating an operating member γ separate from the above.
この発明は、上記の構成により次のような技術的効果を
有する。The present invention has the following technical effects due to the above configuration.
即ち、エンジンを停止して油圧ポンプ２の回転を止めた
時先行弁５は油圧回路中の逆止弁４を逆流防止状態とし
ており油圧シリンダー１内の圧油の戻りを規制して作業
機８の降下を防止しているか、オペレータが、この作業
機８を降下させようとするときには、油圧昇降用の手動
レバー２５とは別の操作部材γでまず先行弁５を切換え
て逆止弁４を逆流可能にし、ついでメインスプール３を
操作する油圧昇降用の手動レバー２５を「下」側に切換
えると作業機８がゆっくり降下する。That is, when the engine is stopped and the rotation of the hydraulic pump 2 is stopped, the advance valve 5 sets the check valve 4 in the hydraulic circuit to the backflow prevention state, and restricts the return of pressure oil in the hydraulic cylinder 1 to the working machine 8. When the operator wants to lower the work equipment 8, he first switches the advance valve 5 and closes the check valve 4 using an operating member γ that is different from the manual lever 25 for hydraulic lifting. When the reverse flow is enabled, and then the manual lever 25 for hydraulic lifting that operates the main spool 3 is switched to the "down" side, the work implement 8 slowly descends.
従ってエンジン停止時には、第三者が誤まって油圧昇降
用の手動レバー２５を「下」側に操作しても作業機８は
降下しないから極めて安全である。Therefore, when the engine is stopped, even if a third party accidentally operates the manual lever 25 for hydraulic lifting to the "down" side, the work implement 8 will not descend, making it extremely safe.
一方、エンジンの作動時には、手動レバー２５を「下」
側に操作すると油圧ポンプ２によって送られる作動油に
よって先行弁５が動かさされ、逆止弁４が逆流可能とな
って油圧シリンダー１内の油はタンク２２に排出され、
作業機８を降下させることができる。On the other hand, when the engine is running, move the manual lever 25 to the "down" position.
When operated to the side, the advance valve 5 is moved by the hydraulic oil sent by the hydraulic pump 2, the check valve 4 is enabled to flow backwards, and the oil in the hydraulic cylinder 1 is discharged into the tank 22.
The work machine 8 can be lowered.
次に図面について説明すると、９は油圧シリンダー１内
を移動するピストン、１０はコンロッド、１１はリフト
アーム、１２は別形式の逆止弁、１３は可変式の絞り弁
、１４はＩＪ ＩＪ−フ弁、１５゜１５′は逆止弁４と
油圧シリンダー１を連結する配管、１６はメインスプー
ル３ど逆止弁４を連結する配管、１γは弁体、１８は押
バネ、１９は弁室、２０は背圧室、２１はタンク２２へ
の圧油逃げ通路、２３は押バネ、２４はコントロールバ
ルブで実施例では該コントロールバルブ２４内に逆止弁
４及び先行弁５を設けているが別体で外部に出しても良
い。Next, to explain the drawings, 9 is a piston that moves within the hydraulic cylinder 1, 10 is a connecting rod, 11 is a lift arm, 12 is a different type of check valve, 13 is a variable throttle valve, and 14 is an IJ IJ-flow valve. Valve, 15° 15' is a pipe connecting the check valve 4 and the hydraulic cylinder 1, 16 is a pipe connecting the main spool 3 and the check valve 4, 1γ is a valve body, 18 is a push spring, 19 is a valve chamber, 20 is a back pressure chamber, 21 is a pressure oil escape passage to the tank 22, 23 is a push spring, and 24 is a control valve, and in the embodiment, a check valve 4 and a preceding valve 5 are provided in the control valve 24, but they are different. You can also release it externally with your body.
２５はメインスプール３を操作する手動レバーで、油圧
ポンプ２からの高圧配管２６と逆止弁４への配管１６間
に亘って中立位置３ａ・下げ位置３ｂ・上げ位置３ｃの
いずれかに操作できる。25 is a manual lever for operating the main spool 3, which can be operated between the high pressure pipe 26 from the hydraulic pump 2 and the pipe 16 to the check valve 4 to any of the neutral position 3a, lowered position 3b, and raised position 3c. .
実施例では中立位置３ａの状態となっている。In the embodiment, it is in a neutral position 3a.
２γ、２８は共にタンク２２への戻り回路、２９は１Ｊ
ＩＪ−フバルブ、３０はコンペンセーター、３１は分流
弁、３２は油吸入管である。2γ, 28 are both return circuits to tank 22, 29 is 1J
30 is a compensator, 31 is a branch valve, and 32 is an oil suction pipe.
次に作用を説明すると、エンジン等の動力により油圧ポ
ンプ２が作動すると吸入管３２から油が吸入され高圧と
なって配管３３に流れ一定量以上の圧油が送られると分
流弁３１の回路３１ａを通過して配管２６に圧油が送ら
れる。Next, to explain the operation, when the hydraulic pump 2 is operated by the power of the engine, oil is sucked from the suction pipe 32, becomes high pressure, flows to the pipe 33, and when a certain amount or more of pressure oil is sent to the circuit 31a of the diverter valve 31. Pressure oil is sent to the pipe 26 through the.
メインスプール３が実施例の如く中立位置３ａにある時
は圧油はコンペンセーター３０を通過してタンク２２に
帰る。When the main spool 3 is at the neutral position 3a as in the embodiment, the pressure oil passes through the compensator 30 and returns to the tank 22.
次にメインスプール３が上げ位置３ｃの状態になった場
合は、配管２６内の高圧油は配管１６及び配管３４に流
れ該配管３４に流れた油は背圧となりコンペンセーター
３０を閉回路とするので高圧油は配管１６にのみ流れ逆
止弁４の弁体１ｒを押バネ１８に逆らって開き配管１５
内に流れる。Next, when the main spool 3 is in the raised position 3c, the high-pressure oil in the pipe 26 flows into the pipe 16 and the pipe 34, and the oil flowing into the pipe 34 becomes back pressure and makes the compensator 30 a closed circuit. Therefore, the high pressure oil flows only into the pipe 16, opening the valve body 1r of the check valve 4 against the push spring 18 and opening the pipe 15.
flows within.
配管１５内に流れた高圧油は逆止弁１２を押し広げて油
圧シリンダー１に流入しピストン９を動かし、コンロッ
ド１０を介してリフトアーム１１を上昇させ作業機８を
上昇させる。The high pressure oil flowing into the pipe 15 expands the check valve 12, flows into the hydraulic cylinder 1, moves the piston 9, raises the lift arm 11 via the connecting rod 10, and raises the working machine 8.
ピストン９が端部まで移動して高圧油の逃げ場が無くな
るとＩＪ ＩＪ−フバルブ２９を開けて高圧油はタンク
２２に戻る。When the piston 9 moves to the end and there is no place for the high pressure oil to escape, the IJ valve 29 is opened and the high pressure oil returns to the tank 22.
次に手動レバー２５を操作してメインスプール３を下げ
位置３ｂの状態にした場合、作業機８の自重によりピス
トン９は押し戻され圧油は絞り弁１３を通って逆止弁４
まで達する。Next, when the manual lever 25 is operated to lower the main spool 3 to the lower position 3b, the piston 9 is pushed back by the weight of the work equipment 8, and the pressure oil passes through the throttle valve 13 and into the check valve 4.
reach up to.
又、一方油圧ポンプ２からの高圧油は配管２６から配管
６に流れ先行弁５を５ｂの状態から５ａの弁室が働らく
ように切替え、このため逆止弁４の背圧室２０の背圧は
配管６′から２１を通りコンロ２２に逃げるので弁体１
γは矢印イ方向に押されて油圧シリンダー１内の圧油は
配管１６から２８を通ってタンク２２へ戻り作業機８は
下降する。On the other hand, high-pressure oil from the hydraulic pump 2 flows from the pipe 26 to the pipe 6 and switches the preceding valve 5 from the state 5b to the valve chamber 5a, which causes the back pressure of the back pressure chamber 20 of the check valve 4 to change. The pressure escapes from pipe 6' to stove 22 through 21, so valve body 1
γ is pushed in the direction of arrow A, the pressure oil in the hydraulic cylinder 1 returns to the tank 22 through the pipes 16 to 28, and the work implement 8 descends.
この時コンペンセーター３０の背圧室と連通ずる配管３
４の油は配管２γを通ってタンク２２に逃げるため、先
行弁５を押した高圧油はすぐにコンペンセーター３０を
通ってタンク２２に戻り高圧油は両弁間で釣合っている
。At this time, the piping 3 communicating with the back pressure chamber of the compensator 30
4 escapes to the tank 22 through the pipe 2γ, the high-pressure oil that pushed the preceding valve 5 immediately returns to the tank 22 through the compensator 30, and the high-pressure oil is balanced between both valves.
次にエンジン等を停止して油圧ポンプ２を作動していな
い時に上昇している作業機８を下げようとしても、配管
２６内に高圧油が流入しないため先行弁５は押バネ２３
で押されたままであり逆止弁４の背圧室２０の内圧と弁
室１９の内圧に差がでないので押バネ１８で弁体１γが
壁部に押し付けられて作業機８は下降しない。Next, even if you try to lower the working machine 8 which has been raised while the engine etc. is stopped and the hydraulic pump 2 is not operating, the advance valve 5 is closed by the push spring 23 because high pressure oil does not flow into the piping 26.
Since there is no difference between the internal pressure of the back pressure chamber 20 of the check valve 4 and the internal pressure of the valve chamber 19, the valve body 1γ is pressed against the wall by the pressing spring 18, and the work implement 8 does not descend.
この構成の効果としてはメインスプール３とコントロー
ルバルブ２４に設けた挿入孔との間隙を大きく取って手
動レバー２５の操作が軽くできる利点はあるが（逆止弁
４が無い場合作業機８の自重により押された圧油が該間
隙を通って洩れてしまうので作業機が自然に降下したり
、又は、間隙を小さくした場合に手動レバー２５の操作
が重くなる）作業機８を降下させようとする毎にエンジ
ン始動せねばならず面倒であった。This configuration has the advantage that the gap between the main spool 3 and the insertion hole provided in the control valve 24 is large, making it easier to operate the manual lever 25. Pressure oil pushed by the machine leaks through the gap, so the work machine may naturally descend, or if the gap is made smaller, it becomes difficult to operate the manual lever 25). It was a hassle to have to start the engine every time.
本実施例では、この先行弁５を別に操作する手動切替レ
バーγを設けたので押バネ２３に逆らって先行弁５を動
かした状態で近傍に設けたメインスプール３の操作レバ
ー２５を下げ方向に操作するとエンジンを始動する事な
く作業機８を降下でき得ると共に単に片方のレバーのみ
を作業者以外の他人がいたずらしても作業機が落下しな
いという安全装置の役目をも果たすのであり、手動切替
レバーγを単に揺動するのみとしておけば、レバーから
手を離すのみで先行弁５は押バネ２３により元に戻り逆
止弁４を逆流防止状態とするので安全である。In this embodiment, a manual switching lever γ for separately operating the preceding valve 5 is provided, so while the preceding valve 5 is moved against the push spring 23, the operating lever 25 of the main spool 3 provided nearby is moved in the downward direction. When operated, the work equipment 8 can be lowered without starting the engine, and it also serves as a safety device that prevents the work equipment from falling even if someone other than the operator tampers with just one lever. If the lever γ is simply swung, it is safe because the advance valve 5 is returned to its original position by the push spring 23 and the check valve 4 is placed in the backflow prevention state simply by releasing the lever.
図はこの発明の一実施例を示すもので、油圧配管の線図
である。
図中、記号１は油圧シリンダー、２は油圧ポンプ、３は
メインスプール、４は逆止弁、５は先行弁、６は別異な
油圧回路、γは手動切替レバーを示す。The figure shows one embodiment of the present invention, and is a diagram of hydraulic piping. In the figure, symbol 1 is a hydraulic cylinder, 2 is a hydraulic pump, 3 is a main spool, 4 is a check valve, 5 is a leading valve, 6 is a different hydraulic circuit, and γ is a manual switching lever.
Claims (1)
間に「上」・「下」・「中位」位置を有する昇降制御用
メインスプール３を設け、該メインスプール３と前記油
圧シリンダー１との間には、油圧シリンダー１からの戻
り油を制御する逆止弁４を設け、この逆止弁４はその背
圧室２０の油が排出されると逆上弁４の出口方向からの
圧力で逆流可能に構成され、逆止弁４とメインスプール
３との間には、油圧ポンプ２の作動中であって、かつメ
インスプール３が「下」位置にあるときに上記逆止弁４
の背圧室２０の油がタンク２２にドレンされて油圧シリ
ンダー１内の圧油がタンク２２に排出されるように作動
する先行弁５を設け、また、この西行弁５は、油圧ポイ
ズ２の停止中であって、油圧昇降用の手動レバー２５と
は別の操作部材γを操作することによって上記逆止弁４
を逆流可能に連動構成しであることを特徴とする牽引車
輛における作業機持上げ装置。1 A main spool 3 for lifting and lowering control having "upper", "lower" and "middle" positions is provided between the hydraulic cylinder 1 for lifting and lowering the working machine and the hydraulic pump 2, and the main spool 3 and the hydraulic cylinder 1 A check valve 4 for controlling the return oil from the hydraulic cylinder 1 is provided between the hydraulic cylinder 1 and the check valve 4. When the oil in the back pressure chamber 20 is discharged, the check valve 4 controls the return oil from the exit direction of the reversal valve 4. The check valve 4 is connected between the check valve 4 and the main spool 3 when the hydraulic pump 2 is in operation and the main spool 3 is in the "lower" position.
A preceding valve 5 is provided which operates so that the oil in the back pressure chamber 20 of the hydraulic cylinder 1 is drained to the tank 22 and the pressure oil in the hydraulic cylinder 1 is discharged to the tank 22. When the check valve 4 is stopped, the check valve 4 is opened by operating an operating member γ other than the manual lever 25 for hydraulic lifting.
A work equipment lifting device for a towing vehicle, characterized in that the work equipment is configured to be interlocked to allow backflow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3125278A JPS5934082B2 (en) | 1978-03-17 | 1978-03-17 | Work equipment lifting device for towing vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3125278A JPS5934082B2 (en) | 1978-03-17 | 1978-03-17 | Work equipment lifting device for towing vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54123416A JPS54123416A (en) | 1979-09-25 |
| JPS5934082B2 true JPS5934082B2 (en) | 1984-08-20 |
Family
ID=12326160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3125278A Expired JPS5934082B2 (en) | 1978-03-17 | 1978-03-17 | Work equipment lifting device for towing vehicles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5934082B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61178092U (en) * | 1985-04-26 | 1986-11-06 | ||
| JPS62147086A (en) * | 1985-12-19 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Enclosed motor-driven compressor |
| JPH0330720B2 (en) * | 1984-08-01 | 1991-05-01 | Matsushita Electric Ind Co Ltd | |
| JPH03258995A (en) * | 1990-03-06 | 1991-11-19 | Matsushita Refrig Co Ltd | Sealed type rotary electric compressor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59163319U (en) * | 1983-04-20 | 1984-11-01 | ヤンマー農機株式会社 | Hydraulic system for riding rice transplanter |
| JPS6051915U (en) * | 1983-09-19 | 1985-04-12 | ヤンマー農機株式会社 | Lifting device for agricultural machinery |
-
1978
- 1978-03-17 JP JP3125278A patent/JPS5934082B2/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0330720B2 (en) * | 1984-08-01 | 1991-05-01 | Matsushita Electric Ind Co Ltd | |
| JPS61178092U (en) * | 1985-04-26 | 1986-11-06 | ||
| JPS62147086A (en) * | 1985-12-19 | 1987-07-01 | Matsushita Electric Ind Co Ltd | Enclosed motor-driven compressor |
| JPH03258995A (en) * | 1990-03-06 | 1991-11-19 | Matsushita Refrig Co Ltd | Sealed type rotary electric compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54123416A (en) | 1979-09-25 |
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