JPH0462379U - - Google Patents
Info
- Publication number
- JPH0462379U JPH0462379U JP10451490U JP10451490U JPH0462379U JP H0462379 U JPH0462379 U JP H0462379U JP 10451490 U JP10451490 U JP 10451490U JP 10451490 U JP10451490 U JP 10451490U JP H0462379 U JPH0462379 U JP H0462379U
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- hydraulic pump
- control
- displacement hydraulic
- variable displacement
- 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.)
- Granted
Links
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Description
第１図〜第４図は本考案の実施例を示し、第１
図は油圧回路図、第２図は制御弁の詳細断面図、
第３図は可変・固定絞り詳細断面図、第４図は具
体的な油圧回路図、第５図は従来例の油圧回路図
である。
１は可変容量型油圧ポンプ、１ａは斜板、２は
操作弁、３はアクチユエータ、１０は制御弁、１
１，１２，１３，１４は第１、第２、第３、第４
受圧部、１６はエンジン、１７は固定容量型油圧
ポンプ、１８は可変絞り、１９は固定絞り。
1 to 4 show embodiments of the present invention.
The figure is a hydraulic circuit diagram, Figure 2 is a detailed sectional view of the control valve,
FIG. 3 is a detailed sectional view of the variable/fixed throttle, FIG. 4 is a specific hydraulic circuit diagram, and FIG. 5 is a hydraulic circuit diagram of a conventional example. 1 is a variable displacement hydraulic pump, 1a is a swash plate, 2 is an operating valve, 3 is an actuator, 10 is a control valve, 1
1, 12, 13, 14 are the first, second, third, fourth
In the pressure receiving section, 16 is an engine, 17 is a fixed capacity hydraulic pump, 18 is a variable throttle, and 19 is a fixed throttle.
Claims (1)
サーボピストン６の受圧室に油圧源の圧油を供給
する制御弁１０を設け、 この制御弁１０を吐出圧Ｐ１と負荷圧Ｐ０の差
圧により出力圧が減圧し、かつ第１制御圧Ｐ２と
第２制御圧Ｐ３の差圧によつても出力圧が減圧さ
れる構造とし、 前記可変容量型油圧ポンプ１を駆動するエンジ
ン１６で駆動される固定容量型油圧ポンプ１７の
吐出路に前記可変容量型油圧ポンプ１の吐出圧Ｐ
１に比例して開口面積が変化する絞りを設け、こ
の絞りの下流側圧力を前記第１制御圧Ｐ２とし、
上流側圧力を前記第２制御圧Ｐ３としたことを特
徴とする可変容量型油圧ポンプの容量制御装置。[Claims for Utility Model Registration] A control valve 10 for supplying pressure oil from a hydraulic source to a pressure receiving chamber of a servo piston 6 that operates a swash plate 1a of a variable displacement hydraulic pump 1 is provided, and this control valve 10 is connected to a discharge pressure P. The output pressure is reduced by the pressure difference between the first control pressure P2 and the second control pressure P3, and the output pressure is also reduced by the pressure difference between the first control pressure P2 and the second control pressure P3 , and the variable capacity type The discharge pressure P of the variable displacement hydraulic pump 1 is applied to the discharge path of the fixed displacement hydraulic pump 17 driven by the engine 16 that drives the hydraulic pump 1.
a throttle whose opening area changes in proportion to
A capacity control device for a variable displacement hydraulic pump, characterized in that the upstream pressure is the second control pressure P3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10451490U JP2560291Y2 (en) | 1990-10-05 | 1990-10-05 | Displacement control device for variable displacement hydraulic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10451490U JP2560291Y2 (en) | 1990-10-05 | 1990-10-05 | Displacement control device for variable displacement hydraulic pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0462379U true JPH0462379U (en) | 1992-05-28 |
| JP2560291Y2 JP2560291Y2 (en) | 1998-01-21 |
Family
ID=31849823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10451490U Expired - Lifetime JP2560291Y2 (en) | 1990-10-05 | 1990-10-05 | Displacement control device for variable displacement hydraulic pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2560291Y2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994010447A1 (en) * | 1992-10-29 | 1994-05-11 | Kabushiki Kaisha Komatsu Seisakusho | Capacity control device in variable capacity hydraulic pump |
| JPH10281102A (en) * | 1997-04-11 | 1998-10-20 | Komatsu Ltd | Capacity control device for variable capacity type hydraulic pump |
| JP2002005321A (en) * | 2000-06-23 | 2002-01-09 | Komatsu Ltd | Pressure reducing valve |
| JP2015075171A (en) * | 2013-10-09 | 2015-04-20 | 日立住友重機械建機クレーン株式会社 | Rotation control unit of construction machine |
| JP2016169818A (en) * | 2015-03-13 | 2016-09-23 | 川崎重工業株式会社 | Hydraulic driving system |
-
1990
- 1990-10-05 JP JP10451490U patent/JP2560291Y2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994010447A1 (en) * | 1992-10-29 | 1994-05-11 | Kabushiki Kaisha Komatsu Seisakusho | Capacity control device in variable capacity hydraulic pump |
| JPH10281102A (en) * | 1997-04-11 | 1998-10-20 | Komatsu Ltd | Capacity control device for variable capacity type hydraulic pump |
| WO1998046883A1 (en) * | 1997-04-11 | 1998-10-22 | Komatsu Ltd. | Capacity control apparatus for variable displacement hydraulic pump |
| JP2002005321A (en) * | 2000-06-23 | 2002-01-09 | Komatsu Ltd | Pressure reducing valve |
| JP4520588B2 (en) * | 2000-06-23 | 2010-08-04 | 株式会社小松製作所 | Pressure reducing valve |
| JP2015075171A (en) * | 2013-10-09 | 2015-04-20 | 日立住友重機械建機クレーン株式会社 | Rotation control unit of construction machine |
| JP2016169818A (en) * | 2015-03-13 | 2016-09-23 | 川崎重工業株式会社 | Hydraulic driving system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2560291Y2 (en) | 1998-01-21 |
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