Patent ID: 9638218
Date: 2017-05-02
CPC Classifications: E02F,F15B,F16K,Y10T

Claim:
1. A joystick pilot valve equipped with a structure for preventing oil leakage comprising: a valve body provided with a hydraulic fluid chamber and at least one supply port in an inner portion thereof; at least one spool installed in the valve body to move between the at least one supply port and the hydraulic fluid chamber and control hydraulic fluid flow; a spool hole formed in the valve body in order to make the at least one spool move forward and backward between the at least one supply port and the hydraulic fluid chamber, the spool hole being connected with the hydraulic fluid chamber or disconnected with the hydraulic fluid chamber while the at least one spool moves forward and backward; a pushing cam connected to an upper portion of the valve body by a joint; a joystick lever connected to the pushing cam to make the at least one spool move in the spool hole forward and backward in order to make the at least one supply port to be connected or disconnected to the hydraulic fluid chamber; an outer boot provided at the valve body in order to cover an outer periphery of the valve body, the pushing cam, and the joystick lever; an inner boot arranged inside of the outer boot and forming a leak oil storage chamber sealed from an upper outer portion of a guide hole through which the at least one spool moves forward and backward; and at least one drain hole formed inside the valve body, one end of the at least one drain hole being connected to the hydraulic fluid chamber and the other end thereof being connected to an area of the leak oil storage chamber.