JPH0299277U - - Google Patents
Info
- Publication number
- JPH0299277U JPH0299277U JP597989U JP597989U JPH0299277U JP H0299277 U JPH0299277 U JP H0299277U JP 597989 U JP597989 U JP 597989U JP 597989 U JP597989 U JP 597989U JP H0299277 U JPH0299277 U JP H0299277U
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- receiving surface
- valve
- pump
- discharge
- 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
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
Description
第１図乃至第３図は従来例の線図、第４図は流
通カツトオフ時の圧力オーバライド範囲を示す線
図、第５図は従来例の流量カツトオフ時の圧力変
動を示す線図、第６図は本考案の実施例の線図、
第７図は第６図示の場合の圧力変動を示す線図で
ある。
１……可変容量形油圧ポンプ、２……吐出回路
、３……制御シリンダ、４……サーボ弁、５……
タンク、６……ばね、７……ピストン、７ｂ……
大径の受圧面、７ｃ……小径の受圧面、８……オ
リフイス、９……カツトオフ弁、１１……一定圧
力源。
Figures 1 to 3 are diagrams of the conventional example, Figure 4 is a diagram showing the pressure override range at flow cut-off, Figure 5 is a diagram showing pressure fluctuations at flow cut-off of the conventional example, and Figure 6 The figure is a line diagram of an embodiment of the present invention,
FIG. 7 is a diagram showing pressure fluctuations in the case shown in FIG. 1... Variable displacement hydraulic pump, 2... Discharge circuit, 3... Control cylinder, 4... Servo valve, 5...
Tank, 6... Spring, 7... Piston, 7b...
Large diameter pressure receiving surface, 7c...Small diameter pressure receiving surface, 8...Orifice, 9...Cut-off valve, 11...Constant pressure source.
Claims (1)
制御シリンダに、サーボ弁を介して該ポンプの吐
出圧とタンク圧とを選択的に導入し、該サーボ弁
の作動を、該ポンプの吐出回路からの圧力及びカ
ツトオフ弁を介して導入した圧力が作用するピス
トンの力とその力に対向するばねの力により制御
し、該カツトオフ弁の作動を、該ポンプの吐出圧
による力とこの力に対向するばねの力により制御
するようにしたものに於いて、該カツトオフ弁を
介して該ピストンに作用する圧力を該吐出回路と
別系統に設けた一定圧力源から導入したことを特
徴とする油圧ポンプの流量制御装置。 ２ 前記ピストンに、一方向に向いた大径の受圧
面と小径の受圧面を形成し、該大径の受圧面に前
記一定圧力源からカツトオフ弁を介して導入した
圧力を作用させると共に該小径の受圧面に前記ポ
ンプの吐出圧を作用させたことを特徴とする請求
項１に記載の油圧ポンプの流量制御装置。[Claims for Utility Model Registration] 1. Selectively introducing the pump's discharge pressure and tank pressure through a servo valve into a control cylinder that controls the discharge flow rate of a variable displacement hydraulic pump, and operating the servo valve. is controlled by the force of the piston on which the pressure from the discharge circuit of the pump and the pressure introduced through the cut-off valve act, and the force of a spring opposing that force, and the operation of the cut-off valve is controlled by the discharge pressure of the pump. In the system, the pressure acting on the piston is introduced through the cut-off valve from a constant pressure source provided in a separate system from the discharge circuit. A flow rate control device for a hydraulic pump characterized by: 2. The piston is formed with a large diameter pressure receiving surface and a small diameter pressure receiving surface facing in one direction, and the pressure introduced from the constant pressure source via the cut-off valve is applied to the large diameter pressure receiving surface, and the small diameter pressure receiving surface is applied to the large diameter pressure receiving surface. The flow rate control device for a hydraulic pump according to claim 1, wherein the discharge pressure of the pump is applied to a pressure receiving surface of the hydraulic pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP597989U JPH0299277U (en) | 1989-01-24 | 1989-01-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP597989U JPH0299277U (en) | 1989-01-24 | 1989-01-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0299277U true JPH0299277U (en) | 1990-08-07 |
Family
ID=31209825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP597989U Pending JPH0299277U (en) | 1989-01-24 | 1989-01-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0299277U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5587865A (en) * | 1978-12-27 | 1980-07-03 | Komatsu Ltd | Control circuit of variable capacity pump |
| JPS60175789A (en) * | 1984-02-21 | 1985-09-09 | Uchida Yuatsu Kiki Kogyo Kk | Operation stabilizing apparatus for variable pump |
| JPS61197780A (en) * | 1985-02-25 | 1986-09-02 | Hitachi Constr Mach Co Ltd | Input controller for hydraulic pump |
-
1989
- 1989-01-24 JP JP597989U patent/JPH0299277U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5587865A (en) * | 1978-12-27 | 1980-07-03 | Komatsu Ltd | Control circuit of variable capacity pump |
| JPS60175789A (en) * | 1984-02-21 | 1985-09-09 | Uchida Yuatsu Kiki Kogyo Kk | Operation stabilizing apparatus for variable pump |
| JPS61197780A (en) * | 1985-02-25 | 1986-09-02 | Hitachi Constr Mach Co Ltd | Input controller for hydraulic pump |
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