JPS59135957U

JPS59135957U - construction machinery

Info

Publication number: JPS59135957U
Application number: JP2801083U
Authority: JP
Inventors: 金子　善二
Original assignee: 日立建機株式会社
Priority date: 1983-02-26
Filing date: 1983-02-26
Publication date: 1984-09-11

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 the drawing]

第１図は従来技術による建設機械を油圧ショベルとした
場合の油圧回路を含む構成図、第２図は本考案に係る建
設機械を油圧ショベルとした場合の油圧回路を含む構成
図、第３図は操作レバー、主切換弁、パイロット弁の組
付状態を示す外観図、第４図は第３図のＩＶ−ＩＶ矢示
方向断面図である。１・・・ブームシリンダ、２・・・パケットシリンダ、
３・・・右走行モータ、４・・・左走行モータ、５・・
・旋回モータ、６・・・アームシリンダ、９．１０・・
・主切換弁、１７・・・エンジン、１８・・・ガバナコ
ントロールレバー、３１・・・シリンダ装置（パイロッ
トアクチュエータとして）、３９・・・パイロットポン
プ、４０・・・パイロット弁。Fig. 1 is a block diagram including a hydraulic circuit when the conventional construction machine is a hydraulic excavator, Fig. 2 is a block diagram including a hydraulic circuit when the construction machine according to the present invention is a hydraulic excavator, and Fig. 3 4 is an external view showing the assembled state of the operating lever, main switching valve, and pilot valve, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. 1...Boom cylinder, 2...Packet cylinder,
3...Right travel motor, 4...Left travel motor, 5...
・Swivel motor, 6...Arm cylinder, 9.10...
- Main switching valve, 17...Engine, 18...Governor control lever, 31...Cylinder device (as a pilot actuator), 39...Pilot pump, 40...Pilot valve.

Claims

[Scope of utility model registration request]

A hydraulic actuator for driving a vehicle or performing construction work, a main switching valve provided between the actuator and a hydraulic source for supplying and discharging pressure oil to the actuator, and the main switching valve. an operating lever for operating the
A state in which the engine is rotated at high speed by the fuel lever in a construction machine comprising an engine for operating the hydraulic power source and a governor control lever operated by a fuel lever for setting the rotation speed of the engine. a hydraulic pilot actuator for operating the governor control lever in a direction to further increase the speed of the engine; and a hydraulic pilot actuator provided between the pilot actuator and a pilot hydraulic pressure source, and a switching operation of the main switching valve by the operating lever. 1. A construction machine comprising: a pilot valve that operates the pilot actuator in a direction to further increase the speed of the engine in conjunction with the pilot actuator.