Heat shield for an exhaust tail pipe

• US 4,085,816 A
• Filed: 03/31/1976
• Issued: 04/25/1978
• Est. Priority Date: 04/04/1975
• Status: Expired due to Term

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Aizawa, Hideo, Kan, Hiroyasu, Kawai, Shizuya, Amagai, Susumu
• Primary Examiner(s): Mitchell, David M.
• Application Number:
  US05/672,464
• Time in Patent Office: 755 Days
• Field of Search: 180/64 A, 248/62, 248/66, 60/299, 60/320, 181/72, 181/36 C, 403/386, 403/202
• US Class Current: 180/89.2
• CPC Class Codes: F01N 13/14 having thermal insulation exhaust manifolds F01N13/102
• CPC Class Codes: Y10T 403/40 Radially spaced members joined by independent coupling

Abstract

A heat shield surrounds an exhaust tail pipe of an internal combustion engine so as to define a certain thickness of an insulating layer of air between the shield and the tail pipe.

Claims

1. For use in a motor vehicle having an internal combustion engine and a body which is spaced from a road surface on which said vehicle stands, a combination comprising:

a cylindrical exhaust tube mounted in use beneath a body of a vehicle to allow the exhaust gases from an internal combustion engine to pass therethrough;

a rectangular heat shielding plate of lesser axial length than said tube provided with a longitudinally extending concave recess having at opposite lateral sides of said concave recess respective step portions extending along the length of the concave recess, the concave recess having a semicircular cross section the radius of which is larger than that of an outer cylindrical surface of said exhaust tube;

at least two axially spaced bridge members each having longitudinal ends respectively connected to said step portions and a middle portion transversely spanning said concave recess, said middle portion being bent toward a bottom of said concave recess to form a round section on which said exhaust tube is disposed in frictional contact therewith, the radius of said round section being smaller than that of said concave recess thereby to define a semicylindrical space between a surface of said heat shielding plate, defining said concave recess and an outer surface of said bridge member whereby a certain semicylindrical air space is defined between said surface of said concave recess and an outer surface of said exhaust tube; and

at least two axially spaced bracket members each having longitudinal ends respectively connected to said step portions of said heat shielding plate and a middle portion covering said exhaust tube and in frictional contact therewith to attach said heat shielding plate to said exhaust tube in such a manner that the bottom of said concave recess is located between said exhaust tube and a road surface when said heat shielding plate is mounted on said exhaust tube and such that said heat shielding plate may move axially relative to said tube.

2. The combination as claimed in claim 1, in which the radius of said round section of said bridge member is generally the same as that of said outer cylindrical surface of said exhaust tube.

3. The combination as claimed in claim 2, in which the middle portion of said bracket member is bent radially outwardly from said concave recess to define a round section the radius of which is generally the same as that of said outer cylindrical surface of said exhaust tube.

4. The combination as claimed in claim 1, in which said ends of said bracket member are respectively disposed on said ends of said bridge member.

5. A combination as claimed in claim 1, in which said bracket member and said bridge member are positioned alternately axially along said exhaust tube.