JPS5844492U

JPS5844492U - Pump displacement control device for variable displacement hydraulic pumps

Info

Publication number: JPS5844492U
Application number: JP13973581U
Authority: JP
Inventors: 稔内田; 水谷　幸三
Original assignee: 内田油圧機器工業株式会社
Priority date: 1981-09-19
Filing date: 1981-09-19
Publication date: 1983-03-25
Also published as: JPS6327103Y2

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は本考案装置の１例の線図、第２図はその制御特
性曲線図である。１・・・可変容量膨油圧ポンプ、２・・・制御ピストン
、２ａ・・・一端部、２ｂ・・・他端部、３・・・回路
、４・・・第１ばね、５・・・スプール、６・・・第２
ばね、７・・・バレル、８・・・弁、１０・・・減圧弁
、１１・・・指令ピストン、１２・・・第３ばね。FIG. 1 is a diagram of an example of the device of the present invention, and FIG. 2 is a diagram of its control characteristic curve. DESCRIPTION OF SYMBOLS 1... Variable capacity expansion hydraulic pump, 2... Control piston, 2a... One end, 2b... Other end, 3... Circuit, 4... First spring, 5... Spool, 6...2nd
Spring, 7... Barrel, 8... Valve, 10... Pressure reducing valve, 11... Command piston, 12... Third spring.

Claims

[Scope of utility model registration request]

In a dispute over the control piston 2 operating the swash plate and other displacement control devices of the variable displacement expansion hydraulic pump 1 to control the output and other aspects of the pump 1, one end 2a of the control piston 2 was connected to the other end. The one end portion 2 is formed to have a smaller area than the portion 2b.
The discharge pressure of the pump 1 is applied to a through the circuit 3, and a spool 5 that is movable against the first spring 4 and a barrel 7 that is movable against the second spring 6 are applied to the other end 2b. The pressure of the circuit 3 was applied through a valve 8 consisting of a pressure reducing valve 10, and the pressure of the circuit 3 was applied to move the barrel 7 against its second spring 6. A command piston 11 operated by the discharge pressure is provided, the command piston 11 is connected to the spool 5, and the command piston 11 is connected to the spool 5.
is movable against the first spring 4, and the control piston 2
A pump displacement control device at the start of startup of a variable displacement expansion hydraulic pump, which is provided with a third spring 12 that resists movement toward one end 2a of the variable displacement hydraulic pump.