JPS616403A - Hydraulic circuit of hydraulic device - Google Patents
Hydraulic circuit of hydraulic deviceInfo
- Publication number
- JPS616403A JPS616403A JP12510584A JP12510584A JPS616403A JP S616403 A JPS616403 A JP S616403A JP 12510584 A JP12510584 A JP 12510584A JP 12510584 A JP12510584 A JP 12510584A JP S616403 A JPS616403 A JP S616403A
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- solenoid valve
- operating handle
- hydraulic pump
- valve
- 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
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/634—Electronic controllers using input signals representing a state of a valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7058—Rotary output members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は一台の定吐出盆形油圧ポンプにより、複数個の
アクチュエータを駆動する油圧駆動装置の油圧回路に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hydraulic circuit for a hydraulic drive device in which a plurality of actuators are driven by a single constant discharge tray-shaped hydraulic pump.
従来のこの種油圧駆動装置は第１図に示すように、油タ
ンク７にフィルタ６を介して連動し、かつモータ５によ
り駆動される油圧ポンプ４と、この油圧ポンプ４の吐出
側に逆止弁３および操作ハンドル２ａ、２’ ａをそ
れぞれ有する切替弁２゜２′を介して接続された油圧モ
ータ１，１′と、前記逆止弁３の流入側および切替弁２
，２′に連通ずると共に、フィルタ９および冷却器１ｏ
を介して油タンク７に連通する安全弁８により構成され
ている。As shown in FIG. 1, a conventional hydraulic drive device of this type includes a hydraulic pump 4 connected to an oil tank 7 via a filter 6 and driven by a motor 5, and a non-return check on the discharge side of the hydraulic pump 4. Hydraulic motors 1, 1' connected via switching valves 2゜2' each having a valve 3 and an operating handle 2a, 2'a, and the inlet side of the check valve 3 and the switching valve 2.
, 2', as well as the filter 9 and the cooler 1o.
It consists of a safety valve 8 that communicates with the oil tank 7 via the oil tank 7.
上記切替弁２，２′が中立時には、各ボートが閉状態の
ブロック回路となっているので、油圧モータ１，１′へ
圧油が供給されないから、油圧モータ１，１′は停止状
態にある。この場合、油圧ポンプ４から吐出される全油
量は、安全弁８、フイルタ９および冷却器１０を経て油
タンクへ戻される。このため、油圧モータ１，１′が停
止状態にあるにもかかわらず、油圧ポンプの消費動力は
最大となる恐れがあった。When the switching valves 2, 2' are in neutral, each boat is in a closed block circuit, so no pressure oil is supplied to the hydraulic motors 1, 1', so the hydraulic motors 1, 1' are in a stopped state. . In this case, the entire amount of oil discharged from the hydraulic pump 4 is returned to the oil tank via the safety valve 8, filter 9, and cooler 10. Therefore, even though the hydraulic motors 1, 1' are in a stopped state, the power consumption of the hydraulic pump may reach its maximum.
この対策としては第２図に示すように、切替弁２．２′
に連通ずるアキュムレータ１１を設け、このアキュムレ
ータ１１に停止用および起動用の各リミットスイッチｌ
ｌａ、ｒｌｂを付設し、このリミットスイッチｌｌａ、
ｌｌｂを介して電動機５を自動運転して動力消費を減少
させる手段がある。その他の構造は、第１図と同一であ
るから説明を省略する。As a countermeasure for this, as shown in Figure 2, the switching valve 2.2'
An accumulator 11 is provided which communicates with the accumulator 11, and each limit switch l for stopping and starting
la, rlb are attached, and this limit switch lla,
There is a means to automatically operate the electric motor 5 via the ILB to reduce power consumption. The rest of the structure is the same as that in FIG. 1, so a description thereof will be omitted.
上記手段のようにアキュムレータ１１の貯油量により、
リミットスイッチｌｌａ、ｌｌｂを作動させて電動機５
を起動および停止させれば、動力の節約に効果はあるが
、その反面、アキュムレータ１１の専用スペースが増大
する恐れがある。As in the above means, depending on the amount of oil stored in the accumulator 11,
Activate the limit switches lla and llb and the electric motor 5
Starting and stopping the accumulator 11 is effective in saving power, but on the other hand, there is a risk that the dedicated space for the accumulator 11 will increase.
本発明は上記にかんがみ簡単な機器を付設することによ
り、アクチュエータが動作していない場合に、油圧ポン
プを無負荷状態で運転させて動力を大幅に節減すると共
に、前記機器の専有スペースを大幅に縮小することを目
的とするものである。In view of the above, by attaching a simple device, the present invention allows the hydraulic pump to operate under no load when the actuator is not operating, thereby significantly saving power and significantly reducing the space occupied by the device. The purpose is to reduce the size.
本発明は上記目的を達成するために、アクチュエータに
接続する切替弁に、その操作ハンドルに連動するリミッ
トスイッチを付設し、このリミットスイッチに連動する
電磁弁を油圧ポンプの吐出側回路および油タンクに連通
ずる戻り油路に接続し、前記切替弁が中立状態のときに
、前記電磁弁を介して油圧ポンプの全吐出量を低圧で油
タンクに戻すようにしたものである。In order to achieve the above object, the present invention attaches a limit switch linked to the operating handle of the switching valve connected to the actuator, and connects the solenoid valve linked to the limit switch to the discharge side circuit of the hydraulic pump and the oil tank. It is connected to a communicating sliding return oil path, and when the switching valve is in a neutral state, the entire discharge amount of the hydraulic pump is returned to the oil tank at low pressure via the electromagnetic valve.
以下、本発明の一実施例を図面について説明する。第３
図に示す符号のうち、第１図に示す符号と同一のものは
同一または該当する部分を示すものとする。An embodiment of the present invention will be described below with reference to the drawings. Third
Among the numerals shown in the figures, the same numerals as those shown in FIG. 1 indicate the same or corresponding parts.
第３図において、２ａ、２’ ａはそれぞれ切替弁２．
２’の操作ハンドルで、こ９操作ハンドル２ａ、２’
ａにはリミットスイッチ１３．１３’がそれぞれ接続
されている。このリミットスイッチ１３．１３’は、電
磁弁１２と直列に接続されている（第７図参照）。その
電磁弁１２は安全弁８と並列に接続されると共に、油圧
ポンプ４の吐出側油路および油タンク７に連通ずる戻り
油路に接続されている。In FIG. 3, 2a and 2'a are switching valves 2.
2' operation handle, these 9 operation handles 2a, 2'
Limit switches 13 and 13' are connected to a, respectively. This limit switch 13, 13' is connected in series with the solenoid valve 12 (see FIG. 7). The solenoid valve 12 is connected in parallel with the safety valve 8 and is also connected to a discharge side oil passage of the hydraulic pump 4 and a return oil passage communicating with the oil tank 7 .
前記操作ハンドル２ａ、２’ ａの構造は第４図ないし
第６図に示すとおりであり、その両者２ａと２’ ａ
は同一構造であるから、その一方の操作ハンドル２ａに
ついて詳述することにする。The structures of the operating handles 2a and 2'a are as shown in FIGS. 4 to 6, and both 2a and 2'a
Since they have the same structure, only one of the operating handles 2a will be described in detail.
操作ハンドル２ａは、その頭部２ａ１がケース１９の上
面に設けたガイド部１９ａを貫通してケース１９の上方
に突出すると共に、基部２ａ２がケース１９内に設けた
レバー１４にピン１５を介して枢着されている。そのレ
バー１４はケース１９の底面に取付けたブラケット１７
にピン１６を介して、枢着されると共に、リンク２０お
よびレバー２１を介して切替弁２に接続されている。前
記ピン１６および操作ハンドル２ａの基部２ａ。The operating handle 2a has a head portion 2a1 that passes through a guide portion 19a provided on the upper surface of the case 19 and protrudes above the case 19, and a base portion 2a2 that connects to a lever 14 provided within the case 19 via a pin 15. It is pivoted. The lever 14 is attached to a bracket 17 attached to the bottom of the case 19.
The switching valve 2 is pivotally connected to the switching valve 2 via a pin 16, and is connected to the switching valve 2 via a link 20 and a lever 21. The pin 16 and the base 2a of the operating handle 2a.
に取付けた突出片２２には、固定用バネ１８の端部がそ
れぞれ固着されている。The ends of the fixing springs 18 are fixed to the protruding pieces 22 attached to the respective protruding pieces 22 .
第３図に示す本実施例の上記説明以外の部分の構成は、
第１図に示す実施例と同様であるから説明を省略する。The configuration of the parts other than the above description of this embodiment shown in FIG. 3 is as follows:
Since it is the same as the embodiment shown in FIG. 1, the explanation will be omitted.
次に上記のように構成された本実施例の作用について説
明する。Next, the operation of this embodiment configured as described above will be explained.
電動機５により油圧ポンプ４を駆動すると、油圧ポンプ
４は油タンク７からフィルタ６を介して油を吸込み逆止
弁３側へ吐出される。この吐出された油は、逆止弁３お
よび切替弁２を経て油圧モータ１に流入してこれを駆動
する。この際、切替弁２はポジション■または○の状態
に保持されている。油圧モータ１から排出された油は、
切替弁２を経てフィルタ９でろ過され、冷却器１０で冷
却された後に油タンク７に戻される。When the hydraulic pump 4 is driven by the electric motor 5, the hydraulic pump 4 sucks oil from the oil tank 7 through the filter 6 and discharges it to the check valve 3 side. This discharged oil flows into the hydraulic motor 1 via the check valve 3 and the switching valve 2 and drives it. At this time, the switching valve 2 is held at position ◯ or ◯. The oil discharged from the hydraulic motor 1 is
The oil is passed through the switching valve 2, filtered by the filter 9, cooled by the cooler 10, and then returned to the oil tank 7.
一方、油圧モータ１′を駆動する場合には、切替弁２′
を操作して行う。この場合の油の流れは上記の場合と全
く同様である。On the other hand, when driving the hydraulic motor 1', the switching valve 2'
This is done by operating. The oil flow in this case is exactly the same as in the above case.
両油圧モータ１，１′を停止させる場合には、操作ハン
ドル２ａ、２’ ａを介して切替弁２，２′をポジク
シ５２０辺状態に保持すると共に、操作ハンドル２ａ、
’２’ ａに連動するリミットスイッチ１３．１３’
を介して電磁弁１２を開路させる。When stopping both hydraulic motors 1, 1', the switching valves 2, 2' are held in the positive 520-side state via the operating handles 2a, 2'a, and the operating handles 2a, 2'a are held in the positive position.
'2' Limit switch 13.13' linked to a
The solenoid valve 12 is opened via the solenoid valve 12.
このため油圧ポンプ４からの全吐出量は、電磁弁１２を
経て油タンク７にバイパスされるからアンロードとなる
ので」油圧ポンプ４の所要動力を減少させることができ
る。これに対し、従来例（第１図）では、油圧ポンプ４
からの全吐出量が、安全弁８を経て高圧で油タンク７に
戻されるので、油圧ポンプ４の所要動力は最大となる不
都合がある。Therefore, the entire discharge amount from the hydraulic pump 4 is bypassed to the oil tank 7 via the electromagnetic valve 12 and is unloaded, so that the power required for the hydraulic pump 4 can be reduced. On the other hand, in the conventional example (Fig. 1), the hydraulic pump 4
Since the entire discharge amount from the hydraulic pump 4 is returned to the oil tank 7 at high pressure via the safety valve 8, the required power of the hydraulic pump 4 is disadvantageously maximized.
前記油圧モータ１を運転する場合には、操作ハンドル２
ａをガイド部１９ａに沿って動作させ、レバー１４．、
リンク２０およびレバー２１を介して切替弁２を、ポジ
ション０たはｅ状態に保持する。前記ガイド部１９ａは
第４図に示すように形成され、矢印０１正方向回転（切
替弁２の■ポジション）、矢印■は配力向回転（切替弁
２の（ハ）ポジション）、■は仲立位置（切替弁２の■
ポジション）、■は中立時の固定位置をそれぞれ示す。When operating the hydraulic motor 1, the operating handle 2
a along the guide portion 19a, and lever 14.a is moved along the guide portion 19a. ,
The switching valve 2 is held in position 0 or e via the link 20 and lever 21. The guide portion 19a is formed as shown in FIG. 4, where arrow 01 indicates rotation in the forward direction (position 2 of the switching valve 2), arrow 2 indicates rotation in the distribution direction (position (C) of the switching valve 2), and 2 indicates rotation in the intermediate direction. Position (■ of switching valve 2)
position) and ■ indicate the fixed position when in neutral.
上記操作ハンドル２ａを中立時■の固定位置に固定する
動作は固定用バネ１８で行われ、その固定位置■のとき
にのみリミットスイッチ１３はオン状態となり、その他
の位置ではオフ状態となる。The action of fixing the operating handle 2a to the neutral fixed position (2) is performed by a fixing spring 18, and the limit switch 13 is in the ON state only when the operating handle 2a is in the fixed position (3), and is in the OFF state at other positions.
前述したように電磁弁１２とリミットスイッチ１３’、
１３を直列に接続し、第７図に示す電気回路を形成して
柄くと、操作ハンドル２ａ、２’ ａが中立位置にあ
るとき、換言すれば油圧モータ１゜１′が停止状態の場
合には、リミットスイッチ１３．１３’はオンするので
、電磁弁１２は励磁してポジション■の状態となる。こ
のため油圧ポンプ４の全吐出量は、電磁弁１２を経て低
圧で油タンク７に戻される。したがって、油圧回路は無
負荷状態となるので、油圧ポンプ４の所要動力は減少す
るから動力を節約することができる。As mentioned above, the solenoid valve 12 and the limit switch 13',
13 in series to form the electric circuit shown in Fig. 7, when the operating handles 2a, 2'a are in the neutral position, in other words, when the hydraulic motor 1°1' is in the stopped state. In this case, the limit switches 13 and 13' are turned on, so the solenoid valve 12 is energized and becomes in position (3). Therefore, the entire discharge amount of the hydraulic pump 4 is returned to the oil tank 7 at low pressure via the solenoid valve 12. Therefore, since the hydraulic circuit is in a no-load state, the power required for the hydraulic pump 4 is reduced, so that power can be saved.
また、アクチュエータが３台以上になった場合でも、第
７図の電気回路に直列にリミットスイッチをアクチュエ
ータの数だけ設けることにより、アンロードｍｌ路を構
成することができる。Furthermore, even when the number of actuators is three or more, the unload ml path can be constructed by providing the same number of limit switches as the number of actuators in series with the electric circuit shown in FIG.
なお、操作ハンドル２ａ、２’ ａをガイド部１ ’
９ ａの中立位置■に操作すると、リミットスイッチ１
３．１３’はオフするので、電磁弁１２は消磁したポジ
ション■の状態となるから、油圧モータ１，１′の運転
が可能になる。Note that the operating handles 2a, 2'a are connected to the guide section 1'
9 When operated to neutral position ■ of a, limit switch 1
Since the valve 3.13' is turned off, the solenoid valve 12 is in the demagnetized position (3), and the hydraulic motors 1, 1' can be operated.
以上説明したように、本発明によれば、油圧回路に電磁
弁を設けると共に、切替弁の操作ハンドルに連動するリ
ミットスイッチを設け、このリミットスイッチを介して
前記電磁弁を作動させることにより、アクチュエータが
動作していない場合には、油圧ポンプを無負荷状態で運
転させて動力を大幅に節約することができる。また、前
記電磁弁とリミットスイッチを付加するだけでよいから
、その専有スペースを著しく縮小することが可能である
。As explained above, according to the present invention, a solenoid valve is provided in the hydraulic circuit, and a limit switch that is linked to the operation handle of the switching valve is provided, and the actuator is operated by operating the solenoid valve via this limit switch. If the hydraulic pump is not operating, the hydraulic pump can be operated under no load, resulting in significant power savings. Furthermore, since it is only necessary to add the solenoid valve and limit switch, the space occupied can be significantly reduced.
第１図および第２図は従来の油圧装置の油圧回路図、第
３図は本発明の油圧装置の油圧回路の一実施例を示す図
、第４図な°いし第６図はそれぞれ第３図の操作ハンド
ル部の上面図、側断面図および正面断面図、第７図は同
実施例の要部の電圧回路図である。
１．１′・・・油圧モータ、２，２′・・・切替弁、２
ａ。
２’ ａ・・・操作ハンドル、４・・・油圧ポンプ、
７・・・油タンク、１２・・・電磁弁、１３．１３’・
・・リミットスイッチ、１８・・・固定用バネ、１９・
・・ケース、１９ａ・・・ガイド部。Figures 1 and 2 are hydraulic circuit diagrams of a conventional hydraulic system, Figure 3 is a diagram showing an embodiment of the hydraulic circuit of a hydraulic system of the present invention, and Figures 4 to 6 are hydraulic circuit diagrams of a conventional hydraulic system. FIG. 7 is a top view, a side sectional view, and a front sectional view of the operating handle part, and FIG. 7 is a voltage circuit diagram of the main part of the same embodiment. 1.1'...Hydraulic motor, 2,2'...Switching valve, 2
a. 2'a...operation handle, 4...hydraulic pump,
7... Oil tank, 12... Solenoid valve, 13.13'.
・・Limit switch, 18・・Fixing spring, 19・
...Case, 19a...Guide part.
Claims (1)
れぞれ有する複数台のアクチユエータを駆動する油圧装
置において、前記各操作ハンドルに固定用バネを取付け
ると共に、その各操作ハンドルのそれぞれに連動するリ
ミツトスイツチを設け、これらのリミツトスイツチに連
動し、かつ前記油圧ポンプの吐出側油路および油タンク
に連通する戻り油路に接続する電磁弁を設け、前記操作
ハンドルのケースに設けたガイド部に中立時の固定位置
を設けると共に、その中立時に各操作ハンドルを前記固
定用バネにより前記固定位置にロツクするように構成し
、その固定位置に操作ハンドルをロツクしたときにのみ
前記リミツトスイツチが作動して前記電磁弁を励磁させ
、油圧ポンプの全吐出量を低圧で油タンクに戻すように
したことを特徴とする油圧装置の油圧回路。In a hydraulic system in which a single oil pump drives a plurality of actuators each having a switching valve with an operating handle, a fixing spring is attached to each of the operating handles, and a limit switch that is linked to each operating handle is provided. , a solenoid valve is provided which is interlocked with these limit switches and connected to the discharge side oil passage of the hydraulic pump and the return oil passage communicating with the oil tank; and each operating handle is configured to be locked in the fixed position by the fixing spring when the operating handle is in its neutral state, and the limit switch is actuated to excite the solenoid valve only when the operating handle is locked in the fixed position. A hydraulic circuit for a hydraulic system, characterized in that the entire discharge amount of a hydraulic pump is returned to an oil tank at low pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12510584A JPS616403A (en) | 1984-06-20 | 1984-06-20 | Hydraulic circuit of hydraulic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12510584A JPS616403A (en) | 1984-06-20 | 1984-06-20 | Hydraulic circuit of hydraulic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS616403A true JPS616403A (en) | 1986-01-13 |
Family
ID=14901969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12510584A Pending JPS616403A (en) | 1984-06-20 | 1984-06-20 | Hydraulic circuit of hydraulic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS616403A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62136191U (en) * | 1986-02-22 | 1987-08-27 | ||
| JPS62149684U (en) * | 1986-03-14 | 1987-09-22 | ||
| JPS63231002A (en) * | 1987-03-16 | 1988-09-27 | Kubota Ltd | Hydraulic circuit of working vehicle |
| JPH04129848U (en) * | 1991-05-20 | 1992-11-27 | 三菱重工業株式会社 | Hydraulic control device for supercharging system in turbo compound engine |
| JPH0614507U (en) * | 1992-07-31 | 1994-02-25 | 株式会社タダノ | Operating device for hydraulic work machine |
-
1984
- 1984-06-20 JP JP12510584A patent/JPS616403A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62136191U (en) * | 1986-02-22 | 1987-08-27 | ||
| JPS62149684U (en) * | 1986-03-14 | 1987-09-22 | ||
| JPH0543342Y2 (en) * | 1986-03-14 | 1993-11-01 | ||
| JPS63231002A (en) * | 1987-03-16 | 1988-09-27 | Kubota Ltd | Hydraulic circuit of working vehicle |
| JPH04129848U (en) * | 1991-05-20 | 1992-11-27 | 三菱重工業株式会社 | Hydraulic control device for supercharging system in turbo compound engine |
| JPH0614507U (en) * | 1992-07-31 | 1994-02-25 | 株式会社タダノ | Operating device for hydraulic work machine |
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