公开(公告)号：US4697498A

公开(公告)日：1987-10-06

申请号：US900402

申请日：1986-08-26

申请人： Seiji Yoshikawa ,  Isao Sato ,  Shigenori Nakayama ,  Mitsuhiro Amazaki

发明人： Seiji Yoshikawa ,  Isao Sato ,  Shigenori Nakayama ,  Mitsuhiro Amazaki

IPC分类号： F04B1/26 ,  B66F9/22 ,  F04B1/32 ,  F04B49/00 ,  F15B11/00 ,  F15B11/04 ,  F15B11/05 ,  F15B13/01 ,  F15B13/04

CPC分类号： F15B13/01

摘要： There is disclosed a spool type direction control valve for controlling the oil flow direction in a hydraulic circuit including a pressure source, a hydraulic cylinder and a spool member. A flow control mechanism is provided in an oil passage connecting one of the oil chambers of the hydraulic cylinder to the spool member. The flow control mechanism comprises a poppet type piston adapted for opening and closing the oil passage. When the spool member is switched over for supplying the pressure fluid to the other oil chamber of the hydraulic cylinder, the pilot pressure from the pressure source is caused to act on the piston in the valve opening direction, while the back pressure of the discharge side pressure fluid corresponding to the load acting on the one oil chamber is caused to act on the piston in the valve closing direction, so as to control the discharge flow of the pressure fluid from the one oil chamber.

摘要翻译： 公开了一种用于控制包括压力源，液压缸和阀芯构件的液压回路中的油流方向的阀芯型方向控制阀。 在将液压缸的油室中的一个连接到卷筒构件的油路中设置有流量控制机构。 流量控制机构包括适于打开和关闭油通道的提升式活塞。 当卷轴构件被切换以将压力流体供应到液压缸的另一个油室时，来自压力源的先导压力在阀打开方向上作用在活塞上，而排出侧的背压 与作用在一个油室上的负载相对应的压力流体在关闭方向上作用在活塞上，从而控制来自一个油室的压力流体的排放流量。