JPH0419220Y2 - - Google Patents
Info
- Publication number
- JPH0419220Y2 JPH0419220Y2 JP1986073954U JP7395486U JPH0419220Y2 JP H0419220 Y2 JPH0419220 Y2 JP H0419220Y2 JP 1986073954 U JP1986073954 U JP 1986073954U JP 7395486 U JP7395486 U JP 7395486U JP H0419220 Y2 JPH0419220 Y2 JP H0419220Y2
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- pilot
- switching valve
- hydraulic pilot
- 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.)
- Expired
Links
- 239000003921 oil Substances 0.000 description 16
- 239000010720 hydraulic oil Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002480 mineral oil Substances 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、油圧シヨベル、油圧クレーン等に用
いられ、特に油圧パイロツト弁によつて操作され
る油圧パイロツト切換弁を備えた油圧回路に関す
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in hydraulic excavators, hydraulic cranes, etc., and particularly relates to a hydraulic circuit equipped with a hydraulic pilot switching valve operated by a hydraulic pilot valve.
従来の油圧回路は、第２図の回路図に示すよう
に構成されており、１は油圧パイロツト切換弁、
２，２′は油圧パイロツト切換弁１を遠隔操作す
る油圧パイロツト弁、３，３′はそれぞれ油圧パ
イロツト切換弁１の可動弁体４の両側に設けたパ
イロツト室Ａ，Ｂと油圧パイロツト弁２，２′の
出力ポート２ａ，２′ａとを接続するパイロツト
管路である。そして、油圧パイロツト切換弁１に
は、ポンプ５に接続されたポンプポートＰと、タ
ンク６に接続されたタンクポートＴと、シリンダ
（アクチユエータ）７のヘツド側室もしくはロツ
ド側室にそれぞれ接続された出力ポートＸ，Ｙと
が設けられている。また、油圧パイロツト弁２，
２′には、それぞれパイロツトポンプ８に接続さ
れたポンプポート２ｂ，２′ｂと、タンク６に接
続されたタンクポート２ｃ，２′ｃとが設けられ
ている。また、前記油圧パイロツト切換弁１のタ
ンクポートＴとタンク６との間には、絞り９とオ
イルクーラ１０とが介在されている。
A conventional hydraulic circuit is constructed as shown in the circuit diagram of Fig. 2, in which 1 is a hydraulic pilot switching valve;
2 and 2' are hydraulic pilot valves for remotely controlling the hydraulic pilot switching valve 1, and 3 and 3' are pilot chambers A and B provided on both sides of the movable valve body 4 of the hydraulic pilot switching valve 1 and the hydraulic pilot valve 2, respectively. This is a pilot conduit connecting output ports 2a and 2'a of 2'. The hydraulic pilot switching valve 1 has a pump port P connected to the pump 5, a tank port T connected to the tank 6, and an output port connected to the head side chamber or rod side chamber of the cylinder (actuator) 7, respectively. X and Y are provided. In addition, hydraulic pilot valve 2,
2' is provided with pump ports 2b, 2'b connected to the pilot pump 8, respectively, and tank ports 2c, 2'c connected to the tank 6. Further, a throttle 9 and an oil cooler 10 are interposed between the tank port T of the hydraulic pilot switching valve 1 and the tank 6.
一般に、油圧パイロツト弁２，２′および油圧
パイロツト切換弁１によつて制御する圧油は、一
般産業機械用鉱物油であり、油圧回路全体に同一
鉱物油が流入している。 Generally, the pressure oil controlled by the hydraulic pilot valves 2, 2' and the hydraulic pilot switching valve 1 is mineral oil for general industrial machinery, and the same mineral oil flows into the entire hydraulic circuit.
前記鉱物油は、タービン90番〜140番程度の粘
度特性を持つており、温度が低くなると、油粘度
も高くなる。 The mineral oil has a viscosity characteristic of turbine No. 90 to No. 140, and as the temperature decreases, the oil viscosity also increases.
ところで、油圧回路において、ポンプ５から吐
出される圧油が通る油圧パイロツト切換弁、シリ
ンダ７、タンク６などは、作動油の温度が比較的
早い時間に上昇するが、パイロツト管路３，３′
内は、同一油が往復するだけであり、しかもパイ
ロツト管路が用いられるために、作動油の温度は
下り易く、上昇しにくい。このことにより、パイ
ロツト管路３，３′の作動油の粘度が高くなると、
パイロツト管路３，３′内の管路損失は増加し、
油圧パイロツト弁２，２′から油圧パイロツト切
換弁１への信号の伝達に時間遅れを生ずる。
By the way, in the hydraulic circuit, the temperature of the hydraulic oil increases relatively quickly in the hydraulic pilot switching valve, cylinder 7, tank 6, etc. through which the pressure oil discharged from the pump 5 passes, but the temperature of the hydraulic oil increases relatively quickly.
Inside, the same oil only moves back and forth, and since a pilot pipe is used, the temperature of the hydraulic oil tends to drop and is difficult to rise. As a result, when the viscosity of the hydraulic oil in the pilot pipes 3 and 3' increases,
The line loss in the pilot lines 3, 3' increases,
This causes a time delay in transmitting the signal from the hydraulic pilot valves 2, 2' to the hydraulic pilot switching valve 1.
本考案は従来の問題点に鑑みなされたもので、
その目的とする所は、低温時における油圧パイロ
ツト弁から油圧パイロツト切換弁への信号伝達の
時間遅れを防止できる油圧回路を提供することに
ある。 This idea was created in view of the problems of the conventional ones.
The purpose is to provide a hydraulic circuit that can prevent time delays in signal transmission from a hydraulic pilot valve to a hydraulic pilot switching valve at low temperatures.
本考案は、上記の目的を達成するために、油圧
パイロツト切換弁のタンクポートを前記油圧パイ
ロツト切換弁の可動弁体内に設けた逆止弁を介し
てパイロツト管路に接続したことを特徴としてい
る。
In order to achieve the above object, the present invention is characterized in that the tank port of the hydraulic pilot switching valve is connected to the pilot pipe through a check valve provided in the movable valve body of the hydraulic pilot switching valve. .
循回によつて高い温度になつている油圧パイロ
ツト切換弁のタンクポートの作動油が、逆止弁を
介してパイロツト管路に導かれるため、パイロツ
ト管路の作動流体の温度が、早期に高くなる。
The hydraulic fluid in the tank port of the hydraulic pilot switching valve, which has reached a high temperature due to circulation, is guided to the pilot pipe through the check valve, so the temperature of the working fluid in the pilot pipe increases quickly. Become.
以下本考案の一実施例を第１図により説明す
る。
An embodiment of the present invention will be described below with reference to FIG.
図において、１２，１２′はそれぞれ油圧パイ
ロツト切換弁１に摺動可能に挿入された可動弁体
（スプール）１１内に設けられた逆止弁で、該逆
止弁は油圧パイロツト切換弁１内のタンクポート
Ｔから油圧パイロツト切換弁１のパイロツト室
Ａ，Ｂへの流れのみを許容する。なお、他の構成
については、第２図と同様であるため、説明を省
略する。 In the figure, reference numerals 12 and 12' each indicate a check valve provided in a movable valve body (spool) 11 slidably inserted into the hydraulic pilot switching valve 1; Only the flow from the tank port T to the pilot chambers A and B of the hydraulic pilot switching valve 1 is allowed. Note that the other configurations are the same as those shown in FIG. 2, so explanations will be omitted.
以上の構成において、一方の油圧パイロツト弁
２に指令が与えられて矢印の方向に押圧される
と、パイロツトポンプ８から吐出されたパイロツ
ト圧油は油圧パイロツト弁２、パイロツト管路３
を通つて、油圧パイロツト切換弁１のパイロツト
室Ａに作用し、油圧パイロツト切換弁１内の可動
弁体１１が図の右方向に移動する。油圧パイロツ
ト切換弁１のパイロツト室Ｂの油は、パイロツト
管路３′、油圧パイロツト弁２′を通してタンク６
へ排出される。前記可動弁体１１の移動による切
換作動によつて、ポンプ５から吐出された圧油は
油圧パイロツト切換弁１を通してアクチユエータ
７に導かれ、アクチユエータ７が作動する。 In the above configuration, when a command is given to one hydraulic pilot valve 2 and it is pressed in the direction of the arrow, the pilot pressure oil discharged from the pilot pump 8 is transferred to the hydraulic pilot valve 2 and the pilot pipe 3.
Through this, it acts on the pilot chamber A of the hydraulic pilot switching valve 1, and the movable valve body 11 in the hydraulic pilot switching valve 1 moves to the right in the figure. The oil in the pilot chamber B of the hydraulic pilot switching valve 1 passes through the pilot pipe 3' and the hydraulic pilot valve 2' to the tank 6.
is discharged to. Due to the switching operation caused by the movement of the movable valve body 11, the pressure oil discharged from the pump 5 is guided to the actuator 7 through the hydraulic pilot switching valve 1, and the actuator 7 is operated.
ポンプ５は、油圧パイロツト弁２，２′の動き
には関係なく吐出油を油圧パイロツト切換弁１に
供給している。この吐出油は、油圧パイロツト切
換弁１のタンクポートＴ、絞り９、オイルクーラ
１０を通してタンクへ排出される。この時、油圧
パイロツト切換弁１内のタンクポートＴの圧力
は、絞り９、オイルクーラ１０などによる流れ抵
抗によつて、タンク６の圧力より高くなつてい
る。 The pump 5 supplies discharge oil to the hydraulic pilot switching valve 1 regardless of the movement of the hydraulic pilot valves 2, 2'. This discharged oil is discharged to the tank through the tank port T of the hydraulic pilot switching valve 1, the throttle 9, and the oil cooler 10. At this time, the pressure at the tank port T in the hydraulic pilot switching valve 1 is higher than the pressure in the tank 6 due to flow resistance caused by the throttle 9, oil cooler 10, and the like.
ここまでは、従来と同様である。 The process up to this point is the same as before.
ところで、油圧パイロツト弁２，２′に矢印方
向の指令がない時には、油圧パイロツト弁２，
２′の出力ポート２ａ，２a′が油圧パイロツト弁
２，２′のタンクポート２ｃ，２c′に連通してい
るため、前記油圧パイロツト切換弁１内のタンク
ポートＴを通る油の一部が、可動弁体１１内の逆
止弁１２，１２′、パイロツト室Ａ，Ｂ、パイロ
ツト管路３，３′、油圧パイロツト弁２，２′のタ
ンクポートＴを通つてタンクへ排出される。これ
により、パイロツト管路３、３′に温度の高い、
つまり粘度の低い油が油圧パイロツト切換弁１よ
り供給されるため、外気が低温であつても油圧パ
イロツト管路３，３′の流れ抵抗による損失が少
なくなり、油圧パイロツト弁２，２′から油圧パ
イロツト切換弁１に伝わる信号の応答特性が良い
状態になる。またパイロツト管路３，３′におけ
る前記損失が少なくなることによつて、パイロツ
ト管路３，３′を細くすることができ、それによ
り管路構成や、配管の自由度が拡大する。また、
油圧パイロツト管路３，３′を細くすることによ
つて、管内の油の圧縮、気泡の圧縮による影響も
少なくなるため、応答性が良くなる。 By the way, when there is no command to the hydraulic pilot valves 2, 2' in the direction of the arrow, the hydraulic pilot valves 2, 2'
Since the output ports 2a and 2a' of the hydraulic pilot switching valves 2 and 2' are in communication with the tank ports 2c and 2c' of the hydraulic pilot valves 2 and 2', a portion of the oil passing through the tank port T in the hydraulic pilot switching valve 1 is It is discharged into the tank through the check valves 12, 12' in the movable valve body 11, the pilot chambers A, B, the pilot lines 3, 3', and the tank ports T of the hydraulic pilot valves 2, 2'. As a result, the pilot pipes 3 and 3' are exposed to high temperatures.
In other words, since oil with low viscosity is supplied from the hydraulic pilot switching valve 1, loss due to flow resistance in the hydraulic pilot pipes 3 and 3' is reduced even when the outside air is low, and the oil is supplied from the hydraulic pilot valves 2 and 2'. The response characteristics of the signal transmitted to the pilot switching valve 1 become good. Furthermore, since the loss in the pilot conduits 3, 3' is reduced, the pilot conduits 3, 3' can be made thinner, thereby increasing the flexibility of the conduit configuration and piping. Also,
By making the hydraulic pilot pipes 3, 3' thinner, the effects of compression of oil and air bubbles in the pipes are reduced, resulting in improved responsiveness.
なお、実施例では油圧パイロツト切換弁１のタ
ンクポートＴとタンク６との間に絞り１２を介在
しタンク６の圧力より高くする構成をとつている
が、オイルクーラ１０およびその前後の管路によ
る流れ抵抗が大きく、それによつて充分にタンク
６の圧力より高い圧力が得られる時には、絞り９
を設けなくともよい。 In the embodiment, a throttle 12 is interposed between the tank port T of the hydraulic pilot switching valve 1 and the tank 6 to make the pressure higher than that of the tank 6. When the flow resistance is large enough to obtain a pressure higher than the pressure in tank 6, the restriction 9
It is not necessary to provide
以上説明した本考案の油圧回路によれば、低温
時における油圧パイロツト弁から油圧パイロツト
切換弁への信号の伝達の時間遅れを防止できる。
According to the hydraulic circuit of the present invention described above, it is possible to prevent a time delay in transmitting a signal from the hydraulic pilot valve to the hydraulic pilot switching valve at low temperatures.
第１図は本考案の油圧回路の一実施例を示す回
路図、第２図は従来の油圧回路を示す回路図であ
る。
１……油圧パイロツト切換弁、２，２′……油
圧パイロツト弁、３，３′……パイロツト管路、
１１……可動弁体、１２，１２′……逆止弁、Ｔ
……タンクポート。
FIG. 1 is a circuit diagram showing an embodiment of the hydraulic circuit of the present invention, and FIG. 2 is a circuit diagram showing a conventional hydraulic circuit. 1... Hydraulic pilot switching valve, 2, 2'... Hydraulic pilot valve, 3, 3'... Pilot pipe line,
11...Movable valve body, 12, 12'...Check valve, T
...tank port.
Claims (1)
パイロツト管路によつて接続した油圧回路におい
て、前記油圧パイロツト切換弁のタンクポート
を、前記油圧パイロツト切換弁の可動弁体内に設
けた逆止弁を介して前記パイロツト管路に接続し
たことを特徴とする油圧回路。 In a hydraulic circuit in which a hydraulic pilot valve and a hydraulic pilot switching valve are connected by a pilot pipe, a tank port of the hydraulic pilot switching valve is connected to a tank port of the hydraulic pilot switching valve via a check valve provided in a movable valve body of the hydraulic pilot switching valve. A hydraulic circuit connected to the pilot conduit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986073954U JPH0419220Y2 (en) | 1986-05-19 | 1986-05-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986073954U JPH0419220Y2 (en) | 1986-05-19 | 1986-05-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62185906U JPS62185906U (en) | 1987-11-26 |
| JPH0419220Y2 true JPH0419220Y2 (en) | 1992-04-30 |
Family
ID=30918745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986073954U Expired JPH0419220Y2 (en) | 1986-05-19 | 1986-05-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0419220Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1872018B1 (en) * | 2005-04-20 | 2008-08-06 | Bucher Hydraulics AG | Pilot valve for a hydraulic motor |
| JP7413228B2 (en) * | 2020-10-28 | 2024-01-15 | 株式会社クボタ | Work equipment hydraulic system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59146603U (en) * | 1983-03-23 | 1984-10-01 | 日立建機株式会社 | Hydraulic pilot circuit warm-up device |
-
1986
- 1986-05-19 JP JP1986073954U patent/JPH0419220Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62185906U (en) | 1987-11-26 |
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