Exhaust gas manifold of an exhaust system for an internal combustion engine

• US 20030056505A1
• Filed: 08/30/2002
• Published: 03/27/2003
• Est. Priority Date: 09/01/2001
• Status: Active Grant

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: Havemann, Kim, Pleuss, Christoph
• Granted Patent: US 6,959,543 B2
• Time in Patent Office: Days
• US Class Current: 60/323
• CPC Class Codes: F01N 13/00 Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
• CPC Class Codes: F01N 13/102 having thermal insulation
• CPC Class Codes: F01N 2260/10 for avoiding stress caused by expansions or contractions due to temperature variations
• CPC Class Codes: Y10T 29/49398 Muffler, manifold or exhaust pipe making

Abstract

An exhaust gas manifold of an exhaust system for an internal combustion engine includes a diverging pipe elbow and exhaust pipes. Each exhaust pipe has an end and is connected to the diverging pipe elbow. The ends of the exhaust pipes extend substantially unidirectionally into the pipe elbow. The sections of the exhaust pipes adjacent to the ends are joined and together form a circular cross section. The portions of the exhaust pipes adjacent to the joined sections are separated from each other with a gap.

Claims

1. Exhaust gas manifold of an exhaust system for an internal combustion engine with a diverging pipe elbow, into which empty the exhaust pipes, which are connected on the engine side, and are held together in a segment of the pipe elbow and are held on the end side in said pipe elbow, wherein the exhaust pipes are arranged unidirectionally in the pipe elbow, and their end sides form altogether a circular cross section, where, on the one hand, the free ends of the exhaust pipes are connected together by a defined edge-sided contact surface with the width;

and, on the other hand, the unidirectional exhaust pipes are separated from each other with a gap over the continued course.

2. Exhaust gas manifold of claim 1, wherein the free ends, which empty into the pipe elbow and belong to the exhaust pipes, are designed triangular as quadrantal segments;

and each pipe end exhibits the edge, which protrudes outwardly with respect to the rest of the area of the exhaust pipe; and

thus the gap is formed between the exhaust pipes.

3. Exhaust gas manifold of claim 2, wherein the edge exhibits a width of approximately 5 mm;

and the gap between the exhaust pipes has a dimension of approximately b=2 mm.

4. Exhaust gas manifold of claim 3, wherein an internal pipe elbow is spaced apart from an external pipe of the pipe elbow;

wherein the edges of the free ends of the exhaust pipes are recessed; and

wherein between the external pipe and the pipe elbow there is a wire mesh ring in the area of the edges.

5. Exhaust gas manifold of claim 4 wherein in the exhaust gas housing the other exhaust pipes, which are held by a fastening flange on the engine side, are connected to the continuing exhaust pipes by means of a sliding seat;

and wherein the exhaust pipes and lie freely over the edge from the fastening flange up to the uptake in the pipe elbow.

6. Exhaust gas manifold of claim 1, wherein the edge exhibits a width of approximately 5 mm;

and the gap between the exhaust pipes has a dimension of approximately b=2 mm.

7. Exhaust gas manifold of claim 1, wherein an internal pipe elbow is spaced apart from an external pipe of the pipe elbow;

wherein the edges of the free ends of the exhaust pipes are recessed; and

wherein between the external pipe and the pipe elbow there is a wire mesh ring in the area of the edges.

8. Exhaust gas manifold of claim 1, wherein in the exhaust gas housing the other exhaust pipes, which are held by a fastening flange on the engine side, are connected to the continuing exhaust pipes by means of a sliding seat;

and wherein the exhaust pipes and lie freely over the edge from the fastening flange up to the uptake in the pipe elbow.

9. An exhaust gas manifold of an exhaust system for an internal combustion engine, the manifold comprising:

a diverging pipe elbow; and

exhaust pipes each having an end and being connected to the diverging pipe elbow, wherein the ends of the exhaust pipes extend substantially unidirectionally into the pipe elbow, wherein sections of the exhaust pipes adjacent to the ends are joined and together form a circular cross section, and wherein portions of the exhaust pipes adjacent to the joined sections are separated from each other with a gap.

10. The exhaust gas manifold of claim 9, wherein the ends of the exhaust pipes each have a generally triangular configuration and each form a quarter of the circular cross section.

11. The exhaust gas manifold of claim 10, wherein the section of each exhaust pipe adjacent to the end of the exhaust pipe extends radially outwardly with respect to the portion of the exhaust pipe adjacent to the section.

12. The exhaust gas manifold of claims 11, wherein the width of the section of each exhaust pipe adjacent to the end of the exhaust pipe is approximately 5 mm, and the gap between the exhaust pipes is approximately 2 mm.

13. The exhaust gas manifold of claim 12, wherein the pipe elbow includes an external pipe and an internal pipe disposed within the external pipe and spaced apart from the external pipe, and wherein the pipe elbow includes a wire mesh ring disposed between the external pipe and the internal pipe near the end of the pipe elbow.

14. The exhaust gas manifold of claim 13, wherein the exhaust pipes are a first set of exhaust pipes, wherein the exhaust gas manifold further comprises a second set of exhaust pipes, and each exhaust pipe of the second set is connected to one of the exhaust pipes of the first set with a sliding connection.

15. The exhaust gas manifold of claim 9, wherein the section of each exhaust pipe adjacent to the end of the exhaust pipe extends radially outwardly with respect to the portion of the exhaust pipe adjacent to the section.

16. The exhaust gas manifold of claims 9, wherein the width of the section of each exhaust pipe adjacent to the end of the exhaust pipe is approximately 5 mm, and the gap between the exhaust pipes is approximately 2 mm.

17. The exhaust gas manifold of claim 9, wherein the pipe elbow includes an external pipe and an internal pipe disposed within the external pipe and spaced apart from the external pipe, and wherein the pipe elbow includes a wire mesh ring disposed between the external pipe and the internal pipe near the end of the pipe elbow.

18. The exhaust gas manifold of claim 9, wherein the exhaust pipes are a first set of exhaust pipes, wherein the exhaust gas manifold further comprises a second set of exhaust pipes, and each exhaust pipe of the second set is connected to one of the exhaust pipes of the first set with a sliding connection.

19. A method of making an exhaust gas manifold, the method comprising:

extending the ends of exhaust pipes of the exhaust gas manifold substantially unidirectionally into a pipe elbow of the exhaust gas manifold;

joining sections of the exhaust pipes adjacent to the ends to form a circular cross section; and

separating portions of the exhaust pipes adjacent to the joined sections from each other with a gap.

20. The method of claim 19, further comprising:

disposing each internal pipe of the pipe elbow within an external pipe of the pipe elbow;

spacing the internal pipe from the external pipe; and

disposing a wire mesh ring between the external pipe and the internal pipe near the end of the pipe elbow.

21. The method of claim 20, further comprising connecting each exhaust pipe of a second set of the exhaust gas manifold to one of the exhaust pipes of a first set of the exhaust gas manifold with a sliding connection.