To provide a port structure of a valve body capable of preventing trouble (seizure) of a solenoid valve without using a filter.
A wall body 6 which surrounds a valve side drain port 5 of the solenoid valve 2 and includes a valve body side drain port 7 on a bottom part is provided on a valve connection port 3 of the valve body 1. A volume of a space 8 between the wall body 6 and the solenoid valve 2 is set larger than a substantial maximum capacity of operating oil flowing in the space 8 from the valve body side drain port 7 in operating a hydraulic control device. Before foreign material sucked together with the sucked operating oil from the valve body side drain port 7 into the valve body 1 reaches the valve side drain port 5, therefore, sucking force is sufficiently reduced, and then the foreign material does not enter an inside of the valve 4 from the valve side drain port 5. The trouble (the seizure) of the solenoid valve is thereby prevented because of nonuse of the filter.
ARIMOTO YOSHITAKA
Miyazaki Yoshio
Kaoru Onozuka
Akio Tagami
High Masahiro
Toshio Nakamura