JPS62165199U

JPS62165199U -

Info

Publication number: JPS62165199U
Application number: JP5395286U
Authority: JP
Priority date: 1986-04-10
Filing date: 1986-04-10
Publication date: 1987-10-20

Description

[Brief explanation of the drawing]

第１図及び第２図はそれぞれ本考案の実施例の
油圧回路図、第３図は従来装置の油圧回路図であ
る。５……液圧作動ラム、７……切換弁（パイロツ
ト切換弁）、８……可変容量形ポンプ、９……原
動機（極数変換電動機）、１２……通常操舵時用
リリーフ弁（リリーフ弁）、１３，１４……流路
、１９……リリーフ弁（バランスピストン型リリ
ーフ弁）、２０，２６……電磁切換弁、２１……
非常操舵時用リリーフ弁（リリーフ弁）、２２，
２８……ベント回路。 1 and 2 are hydraulic circuit diagrams of an embodiment of the present invention, and FIG. 3 is a hydraulic circuit diagram of a conventional device. 5...Hydraulic pressure operated ram, 7...Switching valve (pilot switching valve), 8...Variable displacement pump, 9...Motor (pole conversion motor), 12...Relief valve for normal steering (relief valve) ), 13, 14...flow path, 19...relief valve (balanced piston type relief valve), 20, 26...electromagnetic switching valve, 21...
Relief valve for emergency steering (relief valve), 22,
28...Vent circuit.

Claims

[Scope of utility model registration request]

A closed circuit is constructed of a variable displacement pump connected to the prime mover that changes the steering gear torque between normal steering and emergency steering, a hydraulically operated ram that moves the rudder, and a flow path with a switching valve. A relief valve for normal steering is provided in the hydraulic fluid supply path that connects the ram and the switching valve, and the high pressure side and low pressure side of both flow paths that connect the variable displacement pump and the switching valve are connected to the relief valve for normal steering. A hydraulic rudder having a low-load starting function, characterized in that the valve is connected via a relief valve with an equal set pressure, and a solenoid switching valve is provided at the vent port of the relief valve, and a relief valve for emergency steering is provided downstream of the electromagnetic switching valve. removal device.