| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability against melting by heat in a compact structure. SOLUTION: An electronic heater 6 for heating a valve element 10 or the like of a PCV valve 1 is provided in the PCV valve 1 of an engine. The electronic heater 6 is composed of a coil 22 winding wire material 22a on an outer circumference of a cylindrical resin bobbin 21. Brass wire selected under a condition where both of volumetric resistance rate and resistance temperature coefficient are relatively high as material properties is used for the wire material 22a. The resistance temperature coefficient of the brass wire selected for the wire material 22a has a value allowing continuous electricity supply of at least 60 minutes to the electric heater 6. The PCV valve 1 is provided with a housing 3 composed of resin and the electric heater 6 is formed integrally with a main housing 4 thereof. COPYRIGHT: (C)2009,JPO&INPIT
|
