JPH01176771U - - Google Patents
Info
- Publication number
- JPH01176771U JPH01176771U JP7354588U JP7354588U JPH01176771U JP H01176771 U JPH01176771 U JP H01176771U JP 7354588 U JP7354588 U JP 7354588U JP 7354588 U JP7354588 U JP 7354588U JP H01176771 U JPH01176771 U JP H01176771U
- Authority
- JP
- Japan
- Prior art keywords
- end surface
- spool
- pressure
- force acting
- 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 4
- 239000012530 fluid Substances 0.000 claims 5
- 230000007423 decrease Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は本考案の一実施例における可変容量形
ポンプの圧力制御装置の要部の配管系統図、第２
図は従来の可変容量形ポンプの圧力制御装置の配
管系統図、第３図は同圧力制御装置の要部の配管
系統図である。
１……メイン流路、２……分岐流路、４……可
変絞り弁、５……固定絞り。
Figure 1 is a piping system diagram of the main parts of a pressure control device for a variable displacement pump in one embodiment of the present invention;
The figure is a piping system diagram of a conventional pressure control device for a variable displacement pump, and FIG. 3 is a piping system diagram of the main parts of the same pressure control device. 1... Main flow path, 2... Branch flow path, 4... Variable throttle valve, 5... Fixed throttle.
Claims (1)
る可変要素と、この可変要素の駆動流体を制御す
る三方切換弁とを備え、前記三方切換弁のスプー
ルの一端面にポンプ吐出圧を作用させ、前記スプ
ールの他端面にばねの付勢力と制御圧とを作用さ
せて、前記制御圧をポンプ吐出圧を利用して得、
前記スプールの一端面に作用する力が他端面に作
用する力よりも大きいときはスプールが他端側に
移動してポンプ吐出流量が減少するように前記可
変要素の駆動流体が流れ、前記スプールの他端面
に作用する力が一端面に作用する力よりも大きい
ときはスプールが一端側に移動してポンプ吐出流
量が増加するように前記可変要素の駆動流体が流
れ、前記スプールの他端面に作用する力と一端面
に作用する力とが等しいときは前記可変要素の駆
動流体の流れが遮断されてポンプ吐出流量が一定
に維持される構成の可変容量形ポンプの圧力制御
装置において、ポンプ吐出口と負荷とを接続する
メイン流路に、一端が大気に開放された分岐流路
の他端を接続し、この分岐流路に、圧力設定信号
により駆動される電磁制御式の可変絞り弁と固定
絞りとを他端側から一端側にかけてこの順に介装
し、前記分岐流路の前記可変絞り弁と固定絞りと
の間の液圧を前記三方切換弁のスプールの他端面
に制御圧として作用させる構成としたことを特徴
とする可変容量形ポンプの圧力制御装置。 A variable element that is driven by fluid to vary the pump tilting angle, and a three-way switching valve that controls the driving fluid of the variable element, and a pump discharge pressure is applied to one end surface of the spool of the three-way switching valve, and the The biasing force of a spring and a control pressure are applied to the other end surface of the spool, and the control pressure is obtained using pump discharge pressure,
When the force acting on one end surface of the spool is larger than the force acting on the other end surface, the driving fluid of the variable element flows so that the spool moves to the other end side and the pump discharge flow rate decreases. When the force acting on the other end surface is greater than the force acting on one end surface, the spool moves toward one end, and the driving fluid of the variable element flows so as to increase the pump discharge flow rate, and acts on the other end surface of the spool. In a pressure control device for a variable displacement pump configured such that when the force acting on the variable element is equal to the force acting on one end face, the flow of the driving fluid of the variable element is cut off and the pump discharge flow rate is maintained constant, the pump discharge port A branch channel, one end of which is open to the atmosphere, is connected to the main channel that connects the load and the other end of the branch channel, and an electromagnetically controlled variable throttle valve driven by a pressure setting signal is connected to the branch channel. A throttle is interposed in this order from the other end side to the one end side, and the hydraulic pressure between the variable throttle valve and the fixed throttle of the branch flow path acts as a control pressure on the other end surface of the spool of the three-way switching valve. A pressure control device for a variable displacement pump, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7354588U JPH01176771U (en) | 1988-06-02 | 1988-06-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7354588U JPH01176771U (en) | 1988-06-02 | 1988-06-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01176771U true JPH01176771U (en) | 1989-12-18 |
Family
ID=31298683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7354588U Pending JPH01176771U (en) | 1988-06-02 | 1988-06-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01176771U (en) |
-
1988
- 1988-06-02 JP JP7354588U patent/JPH01176771U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4628690A (en) | Fluid circuit for operating a bidirectional hydraulic motor with a reduced shock | |
| JPH01171984U (en) | ||
| JPH03115161U (en) | ||
| JPH0130014B2 (en) | ||
| JPH01176771U (en) | ||
| EP0781923A4 (en) | Capacity controller of variable capacity hydraulic pump | |
| JPH0425521Y2 (en) | ||
| JPH01152082U (en) | ||
| JPS63193786U (en) | ||
| JPH0633772B2 (en) | Variable displacement pump controller | |
| JPH0417522U (en) | ||
| JPH0299277U (en) | ||
| JPH059524Y2 (en) | ||
| JPH059522Y2 (en) | ||
| JPS61133102U (en) | ||
| JPS643089U (en) | ||
| JPS61101103U (en) | ||
| JPS60191704U (en) | hydraulic system | |
| JPS6412910U (en) | ||
| JPH0478308U (en) | ||
| JPS6386402U (en) | ||
| JPS6189059U (en) | ||
| JPS61146603U (en) | ||
| JPS61211506A (en) | Servo valve | |
| JPS643101U (en) |