Fastening device for a heat shield and method to produce the same

Patent metadata

Field	Value
Publication number	US-9744922-B2
Application number	US-201414392362-A
Country	US
Kind code	B2
Filing date	Jul 28, 2014
Priority date	Jul 26, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A heat shield for shielding of hot areas of a combustion engine. The heat shield has at least one metal sheet layer with a first and a second surface. The at least one metal sheet layer has at least one passage opening for the passage of a fastening element. The layer also has a sleeve which passes through the passage opening. The heat shield further has a decoupling element from flexible material arranged between a circumferential edge of the passage opening and the sleeve. The decoupling element and the sleeve each have a) an annular shank area, which penetrates the passage opening, b) a first collar, which on the first surface extends radially outward relative to the circumferential edge of the passage opening, and c) a second collar, which extends adjacent to the second surface radially outward relative to the circumferential edge of the passage opening.

First claim

The invention claimed is:

1. A heat shield for shielding hot areas of a combustion engine comprising at least one metal sheet layer with a first and a second surface, with the at least one metal sheet layer comprising at least one passage opening for the passage of a fastening element, and a sleeve, which passes through the passage opening, wherein
a decoupling element from flexible material is arranged between a circumferential edge of the passage opening and the sleeve, where the decoupling element and the sleeve each comprise;
a) an annular shank area, which penetrates the passage opening,
b) a first collar, which on the first surface extends radially outward relative to the circumferential edge of the passage opening, and
c) a second collar, which extends adjacent to the second surface radially outward relative to the circumferential edge of the passage opening,

where the first collar of the sleeve radially extends over the first collar of the decoupling element,
where the sleeve in a shank area in the region of the passage opening shows a constant wall thickness and a transition area between the shank area in the region of the passage opening and the first collar at least in sections shows a radial wall thickness that is radially outwardly increased relative to the area at the passage opening,
so that the transition area between the shank area in the region of the passage opening and the first collar at least in sections extends rounded or inclined;
wherein the transition area between the shank area and the first collar of the sleeve on at least 90% of a circumferential extension shows a distance to the metal sheet layer, which is larger than the material thickness of the shank area of the sleeve in the area of the passage opening.

2. The heat shield according to claim 1 , wherein at least one of said sections of said transition area shows an increased radial wall thickness, each of these transition areas shows an increased radial wall thickness compared to the wall thickness of the respective section of the shank area in the region of the passage opening, with the section of the transition area and the respective section of the shank are being located in the same circular segment of the sleeve.

3. The heat shield according to claim 1 , wherein the decoupling element in the area of the second collar comprises an inner diameter (Di 12 ) which is larger than the inner diameter (Di 13 ) in the area of a passage opening of the decoupling element.

4. The heat shield according to claim 1 , wherein the decoupling element is composed of metal wire mesh or silicone.

5. The heat shield according to claim 1 , wherein the first collar of the decoupling element is radially formed towards an outside between the metal sheet layer and the first collar of the sleeve.

6. The heat shield according to claim 1 , wherein the first collar of the decoupling element comprises compressed sections, where different compressed sections may have a different degree of compression.

7. The heat shield according to claim 1 , wherein the shank area wall of the sleeve shows no recesses on an outer or inner circumference.

8. The heat shield according to claim 1 , wherein the annular shank area of the sleeve comprises a circular, oval or elliptic cross section in the plane of the metal sheet layer.

9. The heat shield according to claim 1 , wherein the second collar of the decoupling element comprises a circumferential recess extending along a passage opening of the decoupling element, where the second collar of the decoupling element engages with the sleeve.

10. The heat shield according to claim 1 , wherein the edge of the passage opening of the metal sheet layer on both the first and second surfaces is covered by the decoupling element in the radial direction over a width (B 3 ), which corresponds to at least 40% of the wall thickness (B 10 ) of the decoupling element in the area of the passage opening.

11. The heat shield according to claim 1 , wherein the decoupling element realizes a complete decoupling between the metallic layer and the sleeve, and/or or between the metal sheet layer and a heat emitting or sound emitting part, such as orthogonal to the plane of the metal sheet layer and in all directions in the plane of the metal sheet layer.

12. A heat shield for shielding hot areas of a combustion engine comprising at least one metal sheet layer with a first and a second surface, with the at least one metal sheet layer comprising at least one passage opening for the passage of a fastening element, and a sleeve, which passes through the passage opening, wherein
a decoupling element from flexible material is arranged between a circumferential edge of the passage opening and the sleeve, where the decoupling element and the sleeve each comprise;
a) an annular shank area, which penetrates the passage opening,
b) a first collar, which on the first surface extends radially outward relative to the circumferential edge of the passage opening, and
c) a second collar, which extends adjacent to the second surface radially outward relative to the circumferential edge of the passage opening,

where the first collar of the sleeve radially extends over the first collar of the decoupling element,
where the sleeve in a shank area in the region of the passage opening shows a constant wall thickness and a transition area between the shank area in the region of the passage opening and the first collar at least in sections shows a radial wall thickness that is radially outwardly increased relative to the area at the passage opening,
so that the transition area between the shank area in the region of the passage opening and the first collar at least in sections extends rounded or inclined, wherein the transition area between the shank area and the first collar of the sleeve on at least 90% of its a radial extension shows a radial curvature radius which is larger than the material thickness of the shank area of the sleeve in the area of the passage opening.

13. A heat shield for shielding hot areas of a combustion engine comprising at least one metal sheet layer with a first and a second surface, with the at least one metal sheet layer comprising at least one passage opening for the passage of a fastening element, and a sleeve, which passes through the passage opening, wherein
a decoupling element from flexible material is arranged between a circumferential edge of the passage opening and the sleeve, where the decoupling element and the sleeve each comprise;
a) an annular shank area, which penetrates the passage opening,
b) a first collar, which on the first surface extends radially outward relative to the circumferential edge of the passage opening, and
c) a second collar, which extends adjacent to the second surface radially outward relative to the circumferential edge of the passage opening,

where the first collar of the sleeve radially extends over the first collar of the decoupling element,
where the sleeve in a shank area in the region of the passage opening shows a constant wall thickness and a transition area between the shank area in the region of the passage opening and the first collar at least in sections shows a radial wall thickness that is radially outwardly increased relative to the area at the passage opening,
so that the transition area between the shank area in the region of the passage opening and the first collar at least in sections extends rounded or inclined, wherein the edge of the passage opening of the metal sheet layer relative to the plane (E), in which the metal sheet layer extends at the outer edge of the decoupling element, is bent by an angle towards the side

Assignees

• Reinz Dichtungs Gmbh

Inventors

• Ostermeier Helmut
• Sauter Marc

Classifications

• F01N13/1872

  the assembly using stamp-formed parts or otherwise deformed sheet-metal · CPC title

• F01N13/14

  having thermal insulation {(exhaust manifolds F01N13/102)} · CPC title

• F01N13/1855

  the connection being realised by using bolts, screws, rivets or the like · CPC title

• B60Y2410/12

  Production or manufacturing of vehicle parts · CPC title

• F02B77/11 Primary

  Thermal or acoustic insulation · CPC title