TRANSMISSION SWITCH

摘要

PROBLEM TO BE SOLVED: To provide a transmission switch which can prevent intrusion of oil or the like into a contact room, and improves reliability of the switch as a whole and switching accuracy by preventing sudden rising of pressure in a contact room 14 when a lot is rapidly driven. SOLUTION: The transmission switch is structured with an annular groove 15 provided around the circumference on the center of a cylinder surface of a lot 7, and is attached with an X ring formed by fluorine rubber or the like at the annular groove 15.