Patent ID: 7380397

Claim:
An automobile exhaust pipe assembly, comprising: an internal pipe, having linearly corresponding first end and second end, a plurality of overflow holes disposed on a pipe wall proximate to said first end and said second end to define a first and a second overflow hole sections; a middle pipe, being a conical pipe and having a first end with a diameter larger than that of a second end, an overflow hole disposed on said pipe wall, and said middle pipe is sheathed onto said first overflow hole section of said internal pipe, and said second end of said middle pipe is fixed onto the outside of said pipe wall of said internal pipe, and an overflow space with an increasingly reduced volume is defined between the conical structure of said middle pipe and said internal pipe; an external pipe, being sheathed onto said internal pipe and said middle pipe, and having both ends respectively fixed onto the one end of said external pipe seals sand overflow space and the other end includes said second overflow hole section of said internal pipe; and a restrictor, having a first end and a second end, and the diameter of said first end is larger than that of said second end, and external and internal streamline profiles disposed along said first and second ends, and said first end of said restrictor is coupled to said internal pipe wall of said internal pipe and said second end faces said second end of said internal pipe wherein said internal pipe is comprised of a first pipe section, a second pipe section and a third pipe section coaxially coupled with each other further comprising a connecting pipe disposed at the intersection of said first and second pipe sections for connecting a first end of said restrictor.