JPS58161186U

JPS58161186U - Constant output control device for variable displacement hydraulic pumps

Info

Publication number: JPS58161186U
Application number: JP5628082U
Authority: JP
Inventors: 岩井　哲夫
Original assignee: 内田油圧機器工業株式会社
Priority date: 1982-04-20
Filing date: 1982-04-20
Publication date: 1983-10-27

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来例の線図、第２図はその制御特性の線図、
第３図は本考案の１例の線図、第４図は可変絞りの絞り
面積の変化を表わす線図、第５図は吐出圧と制御弁への
圧力との関係を示す線図、第６図は吐出圧とピストンの
移動距離との関係を示す線図、第７図は吐出圧とポンプ
容量との関係を示す線図である。　− １・・・可変容量杉油圧ポンプ、２・・・ピストン、４
・・・ロッド側の室、５・・・吐出回路、６・・・ヘッ
ド側の室、７・・・制御弁、８・・・ばね、９・・・可
変絞り、１０・・・絞り、１１・・・タンク、１２・・
・パイロット回路。Figure 1 is a diagram of the conventional example, Figure 2 is a diagram of its control characteristics,
Figure 3 is a line diagram of one example of the present invention, Figure 4 is a line diagram showing changes in the aperture area of the variable throttle, Figure 5 is a line diagram showing the relationship between discharge pressure and pressure to the control valve, FIG. 6 is a diagram showing the relationship between the discharge pressure and the moving distance of the piston, and FIG. 7 is a diagram showing the relationship between the discharge pressure and the pump displacement. - 1...Variable displacement cedar hydraulic pump, 2...Piston, 4
...Rod side chamber, 5...Discharge circuit, 6...Head side chamber, 7...Control valve, 8...Spring, 9...Variable aperture, 10...Aperture, 11...tank, 12...
・Pilot circuit.

Claims

[Scope of utility model registration request]

The discharge pressure of the discharge circuit 5 of the pump 1 is introduced into the chamber 4 on the rod side of the piston 2 that controls the displacement of the variable displacement cedar hydraulic pump 1, and the pressure is introduced into the chamber 6 on the other head side via the control valve 7. When discharge pressure is introduced and the control valve 7 opens against the spring 8 interposed between the piston 2 and the piston 2, the piston 2 operates to reduce the pump displacement. The discharge circuit 5 is provided with a pilot circuit 12 connected to a tank 11 having a variable throttle 9 and a throttle 10 whose throttle area decreases as the discharge pressure increases, and both throttles 9.10.
This is a constant output control device for a variable displacement cedar hydraulic pump, in which a pressure between 2 and 3 is applied to the control valve 7 to open the valve.