JPS6084479U

JPS6084479U - Pneumatic circuit of wheel-type hydraulic excavator

Info

Publication number: JPS6084479U
Application number: JP17849883U
Authority: JP
Inventors: 三郎吉尾
Original assignee: 日立建機株式会社
Priority date: 1983-11-17
Filing date: 1983-11-17
Publication date: 1985-06-11
Also published as: JPS635978Y2

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図はホイール式油圧ショベルの一例を示す側面図、
第２図は従来のホイール式油圧ショベルの空圧商略を示
す図、第３図はこの考案の空圧回路の一実施例を示す図
である。５・・・圧縮機、６・・・圧気タンク、７・・・給気管
、８・・・サービスブレーキバルブ、９・・・足踏みペ
ダル、１６・・・シャトル弁、１７・・・圧力取出し管
、１８・・・ブースタ、１９・・・油圧配管、２０・・
・作業ブレーキ兼サービスブレーキ装置、２１・・・導
気管、“２２・・・パーキングブレーキ装置、２３・・
・導気管、２４・・・サスペンションロックバルブ、２
５・・・油圧配管、２６・・・サスペンションロックシ
リンダ、２７・・・油圧配管、２８・・・油タンク、２
９・・・ソレノイド式の。作業ブレーキバルブ、２９ａ・・・ソレノイド、３０・
・・ソレノイド式のパーキングブレーキバルブ、３０ａ
・・・ソレノイド、３１・・・ソレノイド式のサスペン
ション制御バルブ、３１ａ・・・ソレノイド、３２・・
・電気回路、３３・・・切替スイッチ、３４・・・電気
回路、３５：・・スイッチ、３６・・・電気回路、３１
・・・電気回路、３８・・・メインスイッチ、３９゛・
・・蓄電池。Figure 1 is a side view showing an example of a wheeled hydraulic excavator;
FIG. 2 is a diagram showing the pneumatic system of a conventional wheeled hydraulic excavator, and FIG. 3 is a diagram showing an embodiment of the pneumatic circuit of this invention. 5... Compressor, 6... Pressure tank, 7... Air supply pipe, 8... Service brake valve, 9... Foot pedal, 16... Shuttle valve, 17... Pressure takeoff pipe , 18... Booster, 19... Hydraulic piping, 20...
・Working brake and service brake device, 21... Air guide pipe, "22... Parking brake device, 23...
・Air guide pipe, 24...Suspension lock valve, 2
5... Hydraulic piping, 26... Suspension lock cylinder, 27... Hydraulic piping, 28... Oil tank, 2
9...Solenoid type. Working brake valve, 29a... solenoid, 30.
・・Solenoid type parking brake valve, 30a
... Solenoid, 31... Solenoid type suspension control valve, 31a... Solenoid, 32...
・Electric circuit, 33... Selector switch, 34... Electric circuit, 35:... Switch, 36... Electric circuit, 31
...Electric circuit, 38...Main switch, 39゛・
...Storage battery.

Claims

[Scope of utility model registration request]

In a wheeled hydraulic excavator equipped with a service brake device that also serves as a work brake, a parking brake device, and a suspension lock device that are controlled by air pressure,
The input ports of the service brake valve, the solenoid-type working brake valve, the solenoid-type parking brake valve, and the solenoid-type suspension control valve, which are switched by the foot pedal, are connected to a pressure source, and the output ports of the service brake valve and the work brake valve are connected to a pressure source. Connect the output port of the parking brake valve to the control section of the parking brake device, connect the output port of the suspension control valve to the control section of the suspension lock device, and connect the output port of the parking brake valve to the control section of the suspension lock device. In the neutral position, the working brake valve solenoid, the parking brake valve solenoid, and the suspension control valve solenoid are all powered off, and in one switching position, the working brake valve solenoid is connected to the power supply, and the other switching position is switched off. At the position, a changeover switch is provided to connect the parking brake valve solenoid and the suspension control valve solenoid to the power source, and the changeover switch is connected to the main switch, so that the work brake valve can be switched by excitation of the solenoid, which can also be used as a work brake. The service brake device is braked, the parking brake device is released by switching the parking brake valve by energizing the solenoid, and the resuspension lock device is unlocked by switching the suspension control valve by energizing the solenoid. A pneumatic circuit characterized by: