Patent ID: 6148956
Filing Date: 2000-11-21
Classification: F02M

Abstract:
A resonator comprising:an upper case defining a portion of a resonance chamber and having a communicating hole communicating with said resonance chamber;a lower case integrally joined to said upper case and defining said resonance chamber together with said upper case; andan air pipe which is blow molded with said upper case being inserted, which is joined to an outer surface of said upper case where said communicating hole opens, an inside of which forms a gas passage, and which is defined with a through hole forming a common hole with said communicating hole,wherein said air pipe is blow molded by using a polypropylene resin,said lower case is molded by using a nylon resin, andsaid upper case is molded by using an intermediate resin which can be joined to said polypropylene resin and said nylon resin.