JPH0277301U

JPH0277301U -

Info

Publication number: JPH0277301U
Application number: JP15818488U
Authority: JP
Priority date: 1988-12-05
Filing date: 1988-12-05
Publication date: 1990-06-13
Anticipated expiration: 2003-12-05
Also published as: JPH0717841Y2

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の中立位置を示す要
部断面図、第２図は同実施例の切換位置を示す要
部断面図、第３図は従来の再生用切換弁の一例を
示す要部断面図である。１……弁本体、１ａ……嵌入孔、２……ブリツ
ジ通路、３……第１負荷通路、４……第２負荷通
路、５……排出通路、７……スプール、７ａ……
第１スプール、７ｂ……第２スプール、８……環
状溝、９……絞り通孔、１０……油室、１１……
弁座、１２……弁孔、１３……第１通孔、１４…
…第２通孔、１５……ばね、１６……ポペツト弁
、１８……受圧室、１９……通油孔。 Fig. 1 is a sectional view of the main part showing the neutral position of an embodiment of the present invention, Fig. 2 is a sectional view of the main part showing the switching position of the same embodiment, and Fig. 3 is an example of a conventional regeneration switching valve. FIG. 1... Valve body, 1a... Fitting hole, 2... Bridge passage, 3... First load passage, 4... Second load passage, 5... Discharge passage, 7... Spool, 7a...
First spool, 7b... Second spool, 8... Annular groove, 9... Throttle hole, 10... Oil chamber, 11...
Valve seat, 12... Valve hole, 13... First through hole, 14...
...Second communication hole, 15...Spring, 16...Poppet valve, 18...Pressure receiving chamber, 19...Oil hole.

Claims

[Scope of Claim for Utility Model Registration] (1) A spool that is slidably fitted into the fitting hole of the valve body has one side of the bridge passage connected to the hydraulic power source and a first load passage connected to the bottom side chamber of the cylinder. An annular groove is provided in this spool to communicate with the
An oil chamber that communicates with a second load passage connected to the rod side chamber of the cylinder via a first passage hole and communicates with a discharge passage connected to the tank via a throttle passage hole; A valve hole that communicates with the oil chamber through a through hole is provided, and a poppet valve that is pressed by a spring on a valve seat provided between the oil chamber and the valve hole is installed inside the valve hole. The regeneration switching valve is provided with a pressure receiving chamber that communicates with the first load passage through an oil hole behind the regeneration switching valve, and the oil hole is opened on the circumferential surface of the spool, and this opening is located at the neutral position of the spool. A switching valve for regeneration, characterized in that it is closed by a fitting hole in the valve body. (2) An annular groove is provided in the spool that is slidably fitted into the fitting hole of the valve body, communicating one side of the bridge passage connected to the hydraulic power source and the first load passage connected to the bottom side chamber of the cylinder; Inside this spool,
An oil chamber that communicates with a second load passage connected to the rod side chamber of the cylinder via a first passage hole and communicates with a discharge passage connected to the tank via a throttle passage hole; A valve hole that communicates with the oil chamber through a through hole is provided, and a poppet valve that is pressed by a spring on a valve seat provided between the oil chamber and the valve hole is installed inside the valve hole. A regeneration switching valve is provided with a pressure receiving chamber that communicates with the first load passage through an oil hole behind the spool, and the spool is connected to a first spool that is provided with a valve hole that houses a spring and a poppet valve; A second spool is provided with an annular groove, and a second spool is attached to this first spool.
A regeneration switching valve characterized in that the pressure receiving chamber is formed in a first spool by screwing together a spool.