JPS5998106U

JPS5998106U - Vehicle hydraulic system

Info

Publication number: JPS5998106U
Application number: JP19389582U
Authority: JP
Inventors: 英夫荒木
Original assignee: 東芝機械株式会社
Priority date: 1982-12-21
Filing date: 1982-12-21
Publication date: 1984-07-03
Also published as: JPH0129282Y2

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 the drawing]

第１図は従来の車輛用油圧装置を示す概略断面　−図、
第２図は本考案の一実施例を示す概略断面図である。１・・・作業用回路、２−・・操舵シリンダ、３・・・
第１のポンプ、４・・・第？のポンプ、５・・・第３の
ポンプ、６・・・制御弁、７，７ａ・・・分流弁、９ａ
、　　９ｂ・・・可変オリフィス、１０・・・プランジ
ャ、１２・・・スプール、１５ａ１．１５ｂ・・・シリ
ンダボート、１８・・・油入口、１９・・・タンク、２
５　、　　’ｌ　５ａ・・・スプール、３１・・・ポペ
ット、３３．３４・・・通路。Figure 1 is a schematic cross-sectional diagram showing a conventional vehicle hydraulic system.
FIG. 2 is a schematic sectional view showing an embodiment of the present invention. 1... Working circuit, 2-... Steering cylinder, 3...
1st pump, 4th...? pump, 5... third pump, 6... control valve, 7, 7a... diversion valve, 9a
, 9b... variable orifice, 10... plunger, 12... spool, 15a1.15b... cylinder boat, 18... oil inlet, 19... tank, 2
5,'l 5a...spool, 31...poppet, 33.34...passage.

Claims

[Scope of utility model registration request]

(1) having a working circuit, at least two pumps, a steering cylinder, an oil inlet connected to the first pump, and a cylinder boat from which oil for driving the steering cylinder flows out, the oil inlet; Out of the flow rate, the flow rate determined by the opening degree of the variable orifice whose opening changes according to the amount of movement of the blanket and the differential pressure between the front and rear of the variable orifice flows out from the cylinder port, and the remaining flow rate is bypassed to the tank or work circuit. a control valve having a spool that is controlled by a differential pressure across the variable orifice; and a control valve having a control pressure set lower than a spool set pressure of the control valve, and controlled by a differential pressure across the variable orifice. A hydraulic system for a vehicle, comprising a spool, and a diversion valve that allows oil discharged from a second pump to flow out through the spool to an oil inlet of a control valve and a working circuit according to the amount of movement of the spool. In the apparatus, the front top portion of the diverter valve is inserted into the spool of the diverter valve.
A hydraulic system for a vehicle, characterized in that a poppet connected to the pump side of the vehicle is slidably inserted, and a passage is provided in the poppet and the spool to guide the front pressure of the variable orifice to a chamber on one end side of the poppet and the spool. .

(2) The poppet is provided with a mechanism that opens when the second pump pressure is higher than the first pump pressure and closes when the second pump pressure is higher than the first pump pressure. Hydraulic system for the vehicle described.