JPS63150049U - - Google Patents
Info
- Publication number
- JPS63150049U JPS63150049U JP4330887U JP4330887U JPS63150049U JP S63150049 U JPS63150049 U JP S63150049U JP 4330887 U JP4330887 U JP 4330887U JP 4330887 U JP4330887 U JP 4330887U JP S63150049 U JPS63150049 U JP S63150049U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- pilot
- pump
- oil
- switching valves
- 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
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Landscapes
- Operation Control Of Excavators (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図はこの考案にかかるエンジン制御用油圧
回路図、第２図はこの考案にかかる油圧回路の変
形例、第３図は従来技術実施例を示す構成図であ
る。
１６，１６′……エンジン、１７……パイロツ
トポンプ、２１，２１′……ガバナ、２６Ｌ，２
６Ｒ……第１、第２ポンプ、３０……シヤトル弁
、３２……減速シリンダ、３４……パイロツト弁
、３５……スローリターン弁、３８……パイロツ
ト用リリーフ弁、４４……電磁弁。
FIG. 1 is a diagram of a hydraulic circuit for engine control according to this invention, FIG. 2 is a modification of the hydraulic circuit according to this invention, and FIG. 3 is a configuration diagram showing an example of a conventional technology. 16, 16'... Engine, 17... Pilot pump, 21, 21'... Governor, 26L, 2
6R...First and second pumps, 30...Shuttle valve, 32...Deceleration cylinder, 34...Pilot valve, 35...Slow return valve, 38...Pilot relief valve, 44...Solenoid valve.
Claims (1)
タ用切換弁を２個のグループＡ，Ｂに分け、かつ
、グループＡ，Ｂ内のそれぞれ切換弁を並列に配
置し、また、グループＡ，Ｂ内をそれぞれ貫通す
るセンタバイパス油路出口側に各々フートリリー
フ弁と絞り部とを並列に接続し、その上流側を第
１、第２ポンプのそれぞれレギユレータに接続し
、かつ、その下流側を油タンクと連通し、また、
グループＡ、グループＢのそれぞれ圧油供給源と
して第１ポンプ、第２ポンプを配置した油圧回路
において、第１ポンプおよび第２ポンプのそれぞ
れ吐出側油路を連通する油路中間にシヤトル弁を
設け、一方、エンジンのガバナ調整用レバと減速
シリンダ用ピストンロツドとを連結し、また、パ
イロツトポンプ吐出側にパイロツト弁または電磁
弁を設け、上記パイロツト弁または電磁弁と上記
減速シリンダとをスローリターン弁を介して連結
するとともに、上記シヤトル弁とパイロツト弁の
パイロツト圧受圧部とを連通する油路中間、また
は、上記シヤトル弁と電気回路内圧力スイツチと
を連通する油路中間に、パイロツト用リリーフ弁
を介設させて構成したことを特徴とするエンジン
制御用油圧回路。 The switching valves for various hydraulic actuators installed on the hydraulic excavator are divided into two groups A and B, and the switching valves in each group A and B are arranged in parallel, and the switching valves in each group A and B are penetrated. A foot relief valve and a throttle part are each connected in parallel to the outlet side of the center bypass oil passage, the upstream sides thereof are connected to the regulators of the first and second pumps, and the downstream sides thereof are connected to the oil tank, Also,
In a hydraulic circuit in which a first pump and a second pump are arranged as pressure oil supply sources in groups A and B, respectively, a shuttle valve is provided between the oil passages communicating the discharge side oil passages of the first pump and the second pump, respectively. On the other hand, the governor adjustment lever of the engine and the piston rod for the deceleration cylinder are connected, and a pilot valve or solenoid valve is provided on the discharge side of the pilot pump, and a slow return valve is connected between the pilot valve or solenoid valve and the deceleration cylinder. A pilot relief valve is provided in the middle of the oil passage that communicates the shuttle valve and the pilot pressure receiving part of the pilot valve, or in the middle of the oil passage that communicates the shuttle valve and the pressure switch in the electric circuit. A hydraulic circuit for engine control, characterized in that it is constructed by interposing the hydraulic circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4330887U JPS63150049U (en) | 1987-03-23 | 1987-03-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4330887U JPS63150049U (en) | 1987-03-23 | 1987-03-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63150049U true JPS63150049U (en) | 1988-10-03 |
Family
ID=30860043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4330887U Pending JPS63150049U (en) | 1987-03-23 | 1987-03-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63150049U (en) |
-
1987
- 1987-03-23 JP JP4330887U patent/JPS63150049U/ja active Pending