Tail pipe structure of control type muffler

• US 4,840,030 A
• Filed: 01/21/1988
• Issued: 06/20/1989
• Est. Priority Date: 01/28/1987
• Status: Expired due to Fees

• Current Assignee: Calsonic Kansei Corporation
• Original Assignee: Calsonic Kansei Corporation
• Inventors: Ota, Motoki, Ikeda, Tsunemi
• Primary Examiner(s): Hart, Douglas
• Application Number:
  US07/146,422
• Time in Patent Office: 516 Days
• Field of Search: 181/228, 181/254, 181/268, 181/278, 181/236, 181/237, 181/239, 60/324
• US Class Current: 60/324
• CPC Class Codes: F01N 1/166 for changing gas flow path through the silencer or for adjusting the dimensions of a chamber or a pipe F01N1/165 takes precedence
• CPC Class Codes: F01N 13/08 Other arrangements or adaptations of exhaust conduits pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005
• CPC Class Codes: F01N 2470/14 Plurality of outlet tubes, e.g. in parallel or with different length
• CPC Class Codes: F01N 2470/20 Dimensional characteristics of tubes, e.g. length, diameter

Abstract

A tail pipe structure of a control type muffler having a first outlet pipe and a second outlet pipe provided with a control valve inserted therein, wherein the first outlet pipe is in communication with the downstream side of the control valve of the second outlet pipe. The mechanism of the muffler is such that when the control valve is opened, the exhaust gases flow into the atmosphere from the first and second outlet pipes. Further, even when the control valve is closed, the exhaust gases in the first outlet pipe flow into the atmosphere therethrough while a part of the exhaust gases flow into the second outlet pipe from the first outlet pipe through the communication pipe and is then discharged into the atmosphere.

Claims

1. An internal combustion engine tail pipe structure for use with a control type muffler having first and second outlet pipes each having an upstream side for receiving exhaust gases from the muffler and a downstream side for discharge of engine exhaust gases, the second outlet pipe having a control valve inserted therein, characterized by conduit means downstream of the control valve for establishing communication between said first and second outlet pipes at a point of connection between the upstream and downstream ends of said first outlet pipe.

2. A tail pipe structure for use with a control type muffler having first and second outlet pipes each having an upstream side for receiving exhaust gases from the muffler and a downstream side for discharge of engine exhaust gases, the second outlet pipe having a control valve inserted therein, characterized by conduit means downstream of the control valve for establishing communication between said first and second outlet pipes at a point of connection between the upstream and downstream ends of said first outlet pipe, wherein said first and second outlet pipes comprise an orifice therein downstream of said point of connection.

3. A tail pipe according to claim 2 wherein said conduit means is provided therein with a second orifice.

4. A tail pipe structure according to claim 3 wherein the sectional area of the first-said orifice is of the order of 0.5-0.7 times the sectional area of said first outlet pipe.

5. A tail pipe structure according to one of claims 3 and 4 wherein the sectional area of the first-said orifice is smaller than the sectional area of the second orifice.