Kubota Corporation

Seimei Nishikawa

Eiji Miyazaki

Haruka Kitahara

Yoshiro Takao

Juzo Okamoto

Sosuke Miyauchi

A hydraulic block includes multiple pairs of actuator ports connectable to a hydraulic actuator and a discharge oil passage for discharging work oil returned from the hydraulic actuator to the outside. The charge oil passage includes a first oil passage corresponding to a predetermined actuator port of all the actuator ports and a second oil passage corresponding to non-predetermined actuator ports other than the predetermined actuator ports. The first oil passage is disposed in parallel with the second oil passage.

Hydraulic block

An inner oil passage () is formed inside a slidable spool (). The slidable spool () defines, in its circumferential face, a first opening (), a second opening () and a third opening (). The first opening (), the second opening () and the third opening () are communicated to the inner oil passage (). When the slidable spool () is switched to a floating position (F), the first the first opening () is aligned with a first port end portion (), the second opening () is aligned with a second port end portion (), and the third opening () is aligned with a fourth port end portion (), respectively, and a first cylinder port and a second cylinder port are communicated to a tank port () via the inner oil passage ().

Growing community of inventors

Sakai, Japan

Seimei Nishikawa