JPS6027165U

JPS6027165U - Hydraulic excavator hydraulic circuit

Info

Publication number: JPS6027165U
Application number: JP11713083U
Authority: JP
Inventors: 輿水　英之; 和憲吉野
Original assignee: 新キャタピラ−三菱株式会社
Priority date: 1983-07-29
Filing date: 1983-07-29
Publication date: 1985-02-23
Also published as: JPH0352273Y2

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図は従来の油圧ショベルの概略を示す側面図、第２
図はその油圧回路図、第３図は従来及び本案の油圧回路
でのブームシリンダの伸び量１と旋回角度との関係を示
す説明図、第４図は本案に係る油圧ショベルの油圧回路
の一実施例を示す油圧回路図である。２・・・旋回用操作弁、３・・・アーム用操作弁、６・
・・ブーム用操作弁、１０・・・ブームシリンダ、１１
・・・アームシリンダ、１２・・・ロジック弁、１３・
・・他方のポンプ、１４・・・一方のポンプ、１７・・
・旋回モータ、１８・・・セレクタ弁、２７・・・切換
回路、Ａ・・・他方のコントロール弁、Ｂ・・・一方の
コントロール弁。Figure 1 is a side view schematically showing a conventional hydraulic excavator;
Figure 3 is a diagram of the hydraulic circuit, Figure 3 is an explanatory diagram showing the relationship between the extension amount 1 of the boom cylinder and the swing angle in the conventional and hydraulic circuits of the present invention, and Figure 4 is a diagram of the hydraulic circuit of the hydraulic excavator according to the present invention. It is a hydraulic circuit diagram showing an example. 2...Swivel operation valve, 3...Arm operation valve, 6.
...Boom operation valve, 10...Boom cylinder, 11
...Arm cylinder, 12...Logic valve, 13.
...The other pump, 14...One pump, 17...
- Swing motor, 18... Selector valve, 27... Switching circuit, A... Other control valve, B... One control valve.

Claims

[Scope of utility model registration request]

Pressure oil from one pump is supplied to and discharged from the swing motor and arm cylinder via the swing operation valve and arm operation valve connected to the tandem circuit of one control valve, and the pressure oil from the other pump is supplied to and discharged from the other control valve. Pressure oil from the one pump is supplied to the boom cylinder through the boom operation valve of the control valve, and pressure oil from the other pump is supplied to the arm cylinder. The hydraulic circuit of the hydraulic excavator to be supplied and discharged includes a switching circuit having a selector valve and a logic valve that connects the swing motor, the arm cylinder, and the boom cylinder in parallel during a lifting operation of the boom cylinder. A hydraulic circuit for a hydraulic excavator.