JPS6455306U

JPS6455306U -

Info

Publication number: JPS6455306U
Application number: JP15082987U
Authority: JP
Priority date: 1987-10-01
Filing date: 1987-10-01
Publication date: 1989-04-05

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す油圧回路図、
第２図は従来例を示す油圧回路図である。１Ｌ，１Ｒ……油圧シリンダ、２Ｌ，２Ｒ……
オペレートチエツク弁、５……切換弁、６……ポ
ンプ、７……副リリーフ弁、８……主リリーフ弁
、９……モータ、１０……チエツク弁、１１……
吸込通路、１２……チエツク弁、１３……吸込通
路、１４……タンク、１５……ドレーン通路、１
６……ドレーン通路、１７……オペレート通路。 FIG. 1 is a hydraulic circuit diagram showing an embodiment of the present invention;
FIG. 2 is a hydraulic circuit diagram showing a conventional example. 1L, 1R...Hydraulic cylinder, 2L, 2R...
Operated check valve, 5...Switching valve, 6...Pump, 7...Sub-relief valve, 8...Main relief valve, 9...Motor, 10...Check valve, 11...
Suction passage, 12... Check valve, 13... Suction passage, 14... Tank, 15... Drain passage, 1
6...Drain passage, 17...Operate passage.

Claims

[Scope of utility model registration request]

In a hydraulic drive device in which a load applied to the hydraulic cylinder is maintained by interposing an operating check valve in the middle of a supply passage that sends hydraulic oil pressurized by a hydraulic pump to a hydraulic cylinder, the hydraulic pump is connected to a motor. The supply passage is connected to the hydraulic pump discharge side when the motor rotates in the normal direction, and the drain passage communicates with the tank via the main relief valve, and the tank via the check valve. a suction passage which communicates the suction side of the hydraulic pump with the tank via a check valve when the motor rotates normally, and a drain passage which communicates with the tank via an auxiliary relief valve;
A hydraulic drive device characterized in that each of the operating check valves is connected to an operating passage for introducing operating pressure.