JPS5946757U

JPS5946757U - Brake operation control mechanism for construction vehicles

Info

Publication number: JPS5946757U
Application number: JP12158483U
Authority: JP
Inventors: 山内　正久
Original assignee: カヤバ工業株式会社
Priority date: 1983-08-04
Filing date: 1983-08-04
Publication date: 1984-03-28
Also published as: JPS6328704Y2

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]

図面第１図及び第２図はこの考案の実施例を示すもので
、第１図は回路図、第２図はリリーフ弁と一体化したカ
ウンターバランス弁の断面図、第３図は従来の回路図で
ある。２１・・・・・・モータ、２５・・・・・・リリーフ弁
、２７・・・・・・シリンダ、３５・・・・・・弁本体
、３６・・・・・・スプール、３９．４０・・・・・・
第１ポート、４３・・・・・・制動ポート、４４・・・
・・・タンク、４５・・・・・・タンクポート、５４゜
５５・・・・・・第２ボート。Figures 1 and 2 show an embodiment of this invention; Figure 1 is a circuit diagram, Figure 2 is a sectional view of a counterbalance valve integrated with a relief valve, and Figure 3 is a conventional circuit. It is a diagram. 21... Motor, 25... Relief valve, 27... Cylinder, 35... Valve body, 36... Spool, 39.40・・・・・・
1st port, 43... Braking port, 44...
... Tank, 45 ... Tank port, 54°55 ... Second boat.

Claims

[Scope of utility model registration request]

The brake is released when it is connected to the pressure oil supply side,
In a brake operation control mechanism for a construction vehicle, which is equipped with a parking brake that applies the brake when connected to a tank, and which applies the brakes using a relief valve while driving, the pump Alternatively, a spool is installed inside the valve body, which has two pairs of first ports that communicate with the tank and a pair of second ports that constantly communicate with the motor, and the valve body has a spool that is always connected to the parking brake cylinder. and a tank port that communicates directly with the tank, and when the spool is in the neutral position, the brake port communicates with the tank port, while the spool has left and right ports that communicate with the tank port. When the spool is in the neutral position, the communication between the brake port and the tank port is cut off, and the first port and the brake port are communicated with each other. When the spool is in the neutral position, the brake port A brake operation control mechanism for a construction vehicle, which is equipped with a counterbalance valve equipped with a switching mechanism that connects the brake directly to a tank port.