Patent ID: 8528533
Filing Date: 2013-09-10
Classification: F02P,H01T

Abstract:
1. A plughole waterproofing device for an engine comprising: a coil case for covering an ignition coil, the coil case is configured to be fitted onto the ignition coil that is accommodated, together with an ignition plug, in a plughole opened to an upper surface of an engine, wherein a longitudinal air path and a vent hole are provided in an upper portion, configured to protrude above the engine, of the coil case, the longitudinal air path extending upward from a lower end portion of the case upper portion communicating with the plughole, the vent hole communicating with an upper end portion of the longitudinal air path and being opened to ambient air, wherein the vent hole is provided in an upper portion of the case upper portion, wherein a cover wall is continuously provided on the case upper portion, the cover wall configured to hang toward the upper surface of the engine while surrounding the vent hole, wherein an air chamber is formed inside the cover wall, the vent hole being opened in an upper portion of the air chamber, an opening face being formed at an entire bottom of the air chamber in such a manner as to open downwardly, and wherein the air chamber is formed in such a manner that a cross-sectional area of the air chamber is gradually increased toward the opening face.