Sealing plug and a watertight connector provided therewith

摘要

A rubber plug ( 10 ) is inserted into a cavity ( 21 ) of a connector housing ( 20 ) after an insulated wire ( 40 ) is inserted through a wire insertion hole ( 11 ) to provide a watertight seal between an inner wall of the cavity ( 24 ) and the insulated wire ( 40 ). Frictional resistance between the inner wall of the cavity ( 24 ) and the rubber plug ( 10 ) is larger than the frictional resistance between the insulated wire ( 40 ) and the rubber plug ( 10 ). The frictional resistance between the insulated wire ( 40 ) and the rubber plug ( 10 ) permits movement of the insulated wire ( 40 ) relative to the rubber plug ( 10 ) when the insulated wire ( 40 ) is caused to expand in longitudinal direction by heat.