JPH01118173U - - Google Patents

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Publication number
JPH01118173U
JPH01118173U JP1278288U JP1278288U JPH01118173U JP H01118173 U JPH01118173 U JP H01118173U JP 1278288 U JP1278288 U JP 1278288U JP 1278288 U JP1278288 U JP 1278288U JP H01118173 U JPH01118173 U JP H01118173U
Authority
JP
Japan
Prior art keywords
servo
oil passage
pair
variable displacement
hydraulic pump
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
Application number
JP1278288U
Other languages
Japanese (ja)
Other versions
JPH0744773Y2 (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1988012782U priority Critical patent/JPH0744773Y2/en
Publication of JPH01118173U publication Critical patent/JPH01118173U/ja
Application granted granted Critical
Publication of JPH0744773Y2 publication Critical patent/JPH0744773Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図〜第４図は本考案の実施例を示すもので
、第１図は可変容量型油圧ポンプの制御装置の構
成図、第２図は油路切換機構の縦断面図、第３図
はその―線断面図、第４図はその弁開度特性
線図、第５図は従来の油路切換機構の要部縦断面
図である。 Ｐ……可変容量型油圧ポンプ、Ｕ……油圧サー
ボ機構、Ｐｄ……吐出圧、Ｐｉ……外部パイロツ
ト圧、１……斜板、２……サーボシリンダ機構、
２ａ……サーボ室、２ｂ……サーボピストン、３
……油路切換機構、４……馬力制御用パイロツト
スプール機構、５……流量制御用パイロツトスプ
ール機構、６……油路、３３……第２ポート、３
３ａ……低応答通路、３３ｂ……高応答通路、３
５……スプール、３５ａ……第１ランド。 Figures 1 to 4 show an embodiment of the present invention, in which Figure 1 is a configuration diagram of a control device for a variable displacement hydraulic pump, Figure 2 is a vertical sectional view of an oil passage switching mechanism, and Figure 3 is a diagram of a control device for a variable displacement hydraulic pump. 4 is a sectional view taken along the line, FIG. 4 is a valve opening characteristic diagram thereof, and FIG. 5 is a longitudinal sectional view of a main part of a conventional oil passage switching mechanism. P...variable displacement hydraulic pump, U...hydraulic servo mechanism, Pd...discharge pressure, Pi...external pilot pressure, 1...swash plate, 2...servo cylinder mechanism,
2a... Servo chamber, 2b... Servo piston, 3
... Oil path switching mechanism, 4 ... Pilot spool mechanism for horsepower control, 5 ... Pilot spool mechanism for flow rate control, 6 ... Oil path, 33 ... Second port, 3
3a...Low response passage, 33b...High response passage, 3
5...Spool, 35a...1st land.

Claims (1)

【実用新案登録請求の範囲】 斜板の傾転角を変化させる油圧サーボ機構を備
えた可変容量型油圧ポンプにおいて、 上記油圧サーボ機構のうちの油圧サーボシリン
ダ機構のサーボ室へサーボ圧を導入する油路を切
換える油路切換機構を設け、 上記油路切換機構に形成されたポートであつて
上記サーボ室へ連なるポートは、そのポートを閉
じる中立位置にあるスプールのランドの両端近傍
部に対応する少なくとも１対の小断面積の低応答
通路と、この少なくとも１対の低応答通路間に位
置しそれよりも大断面積の少なくとも１対の高応
答通路とで構成されていることを特徴とする可変
容量型油圧ポンプの制御装置。[Scope of Claim for Utility Model Registration] In a variable displacement hydraulic pump equipped with a hydraulic servo mechanism that changes the tilt angle of the swash plate, servo pressure is introduced into the servo chamber of a hydraulic servo cylinder mechanism of the hydraulic servo mechanism. An oil passage switching mechanism for switching the oil passage is provided, and ports formed in the oil passage switching mechanism and connected to the servo chamber correspond to portions near both ends of the land of the spool at a neutral position where the port is closed. It is characterized by being comprised of at least one pair of low-response passages with a small cross-sectional area and at least one pair of high-response passages with a larger cross-sectional area located between the at least one pair of low-response passages. Control device for variable displacement hydraulic pump.
JP1988012782U 1988-02-02 1988-02-02 Control device for variable displacement hydraulic pump Expired - Lifetime JPH0744773Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1988012782U JPH0744773Y2 (en) 1988-02-02 1988-02-02 Control device for variable displacement hydraulic pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988012782U JPH0744773Y2 (en) 1988-02-02 1988-02-02 Control device for variable displacement hydraulic pump

Publications (2)

Publication Number Publication Date
JPH01118173U true JPH01118173U (en) 1989-08-09
JPH0744773Y2 JPH0744773Y2 (en) 1995-10-11

Family

ID=31222534

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988012782U Expired - Lifetime JPH0744773Y2 (en) 1988-02-02 1988-02-02 Control device for variable displacement hydraulic pump

Country Status (1)

Country Link
JP (1) JPH0744773Y2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009243425A (en) * 2008-03-31 2009-10-22 Kayaba Ind Co Ltd Servo-regulator
JP2012520971A (en) * 2009-03-18 2012-09-10 イートン コーポレーション Control valve for variable displacement pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59194180A (en) * 1983-04-15 1984-11-02 Kurimoto Iron Works Ltd Self-actuated constant flow rate valve
JPS60121565U (en) * 1984-01-23 1985-08-16 前澤工業株式会社 automatic control valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59194180A (en) * 1983-04-15 1984-11-02 Kurimoto Iron Works Ltd Self-actuated constant flow rate valve
JPS60121565U (en) * 1984-01-23 1985-08-16 前澤工業株式会社 automatic control valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009243425A (en) * 2008-03-31 2009-10-22 Kayaba Ind Co Ltd Servo-regulator
JP2012520971A (en) * 2009-03-18 2012-09-10 イートン コーポレーション Control valve for variable displacement pump

Also Published As

Publication number Publication date
JPH0744773Y2 (en) 1995-10-11

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