JPS622801U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案の実施例を示す油圧回路図、第
２図は電磁切替弁を切替えるための電気回路図、
第３図は従来例を示す油圧回路図である。 １……エンジン、２……油圧ポンプ、３……タ
ンク、４……サクシヨンフイルタ、５，６，１０
……管路、７……インラインフイルタ、８……ア
ンロード弁、９……アキユムレータ、１１……操
作用減圧弁、１２……操作レバー、１３……バイ
パス管路、１４……電磁切替弁、１５……タイマ
スイツチ。 Fig. 1 is a hydraulic circuit diagram showing an embodiment of the present invention, Fig. 2 is an electric circuit diagram for switching an electromagnetic switching valve,
FIG. 3 is a hydraulic circuit diagram showing a conventional example. 1... Engine, 2... Hydraulic pump, 3... Tank, 4... Suction filter, 5, 6, 10
... Pipe line, 7 ... In-line filter, 8 ... Unload valve, 9 ... Accumulator, 11 ... Operation pressure reducing valve, 12 ... Operation lever, 13 ... Bypass pipe line, 14 ... Solenoid switching valve , 15...Timer switch.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] エンジンにて駆動される油圧ポンプの吐出管路
に圧力保持手段を介して油圧機器を接続してなる
油圧源回路において、油圧ポンプと圧力保持手段
との間の管路からバイパス管路を分岐させ、この
バイパス管路に同管路をタンクに連通させる第１
位置と同管路をブロツクする第２位置とに切替自
在の電磁切替弁を詳設け、この電磁切替弁を第１
位置に付勢するとともに、エンジンの起動後所定
時間経過後に電磁切替弁を第２位置に切替えるタ
イマスイツチを設けてなることを特徴とする油圧
源回路。 In a hydraulic power source circuit in which a hydraulic device is connected to a discharge pipe of a hydraulic pump driven by an engine via a pressure holding means, a bypass pipe is branched from the pipe between the hydraulic pump and the pressure holding means. , a first pipe that connects the bypass pipe to the tank.
An electromagnetic switching valve that can be freely switched between a first position and a second position that blocks the same pipe is provided, and this electromagnetic switching valve is switched between a first position and a second position that blocks the pipe.
1. A hydraulic power source circuit comprising a timer switch that biases the electromagnetic switching valve to the second position and switches the electromagnetic switching valve to the second position after a predetermined period of time has elapsed after starting the engine.