EXHAUST FLOW DIRECTOR AND CATALYST MOUNT FOR INTERNAL COMBUSTION ENGINE

Abstract

An exhaust flow director and catalyst mount for an internal combustion engine includes a collector chamber with an outlet flange adapted for direct connection with an exhaust treatment catalyst. A number of transitional guide vanes located within the collector chamber direct exhaust gases flowing from runners into the collector chamber. The runners attaching exhaust flanges and the outlet flange of the present device are substantially coplanar.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an exhaust flow director and catalyst mount for internal combustion engine, according to the present invention.

FIG. 2 is a plan view of the present exhaust flow director and catalyst mount showing this device mounted to the cylinder head of an engine with a number of threaded fasteners.

FIG. 3 is a sectional view through an internal combustion engine according to the present invention having the present exhaust flow director and catalyst mount.

FIG. 4 is an enlarged view of the exhaust flow director and catalyst mount shown in FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in FIG. 1, exhaust flow director and catalyst mount 10 attach to an engine by means of exhaust flanges 30. Exhaust runners 38A, 38B and 38C extend from each exhaust flange 30 to a collector chamber 22, which is shown with particularity in FIGS. 3 and 4. FIG. 4 also shows velocity profile P, across front face 50 of leading catalyst element 48. Exhaust catalyst 46 shown in FIG. 4 has two bricks or monolithic substrates 48 and 54. As shown in FIG. 4, the velocity profile is generally uniform. This means that the entire catalyst will be used to accomplish the required exhaust after treatment.

The uniform velocity profile illustrated in FIG. 4 is achieved in part by means of guide vanes which are formed integrally with the walls of collector chamber 22. Two guide vanes are shown in FIG. 2 at 42. Guide vanes 42, in combination with the placement of exhaust runners 38, cause a swirling component in the flow so that the portions of exhaust, in the illustrated example numbering 3, are turned and directed down into different, but overlapping, portions of front face 50 of catalyst 46 such that a uniform flow distribution is achieved prior to the midbed portion of catalyst leading element 48. Because exhaust gases are caused to flow through runners 38 and collector chamber 22 and into catalyst 46 without excessive scrubbing of the collector chamber walls, heat loss in the exhaust gases is minimized. This is a marked contrast from many prior art exhaust handling devices.

FIG. 2 shows a further important feature of an exhaust flow director and catalyst mount according to the present invention inasmuch as exhaust flanges 30, exhaust runners 38, and outlet flange 26 are generally coplanar. This allows access to all of fasteners 36 simultaneously, so as to permit fastening of exhaust flow director 10 to an engine in a single operation. Once flow director 10 has been attached to an engine, catalyst 46 (FIGS. 3 and 4) may be mounted to the flow director.

FIG. 4 shows an installed advantage of the present exhaust flow director and catalyst mount inasmuch as catalyst 46 is shown as being connected directly to the flow director with a generous collector/chamber smoothing and guiding the flow into the catalyst brick as shown in FIG. 4.

It is also seen from FIG. 3 that the packaging space required for the present exhaust flow director and catalyst is minimized because intermediate pipes as well as, for that matter, an underbody catalyst, can and have been eliminated.

While particular embodiments of the invention have been shown and described, numerous variations and alternate embodiments will occur to those skilled in the art. Accordingly, it is intended that the invention be limited only in terms of the appended claims.

Claims

1. An exhaust flow director and catalyst mount for an internal combustion engine, comprising: a collector chamber having an outlet structure adapted for connection with an exhaust treatment catalyst;a plurality of exhaust flanges adapted for mounting to a plurality of exhaust ports exiting from a cylinder head of an engine;a plurality of exhaust runners, with one of said runners extending from each of said exhaust flanges to said collector chamber; anda plurality of transitional guide vanes, located within said collector chamber, for directing exhaust gases flowing from the runners and into the collector chamber.

2. An exhaust flow director and catalyst mount according to claim 1, wherein said transitional guide vanes are formed integrally with at least one wall of said collector chamber.

3. An exhaust flow director and catalyst mount according to claim 1, wherein said transitional guide vanes and said exhaust runners are configured such that gases leaving said collector chamber are turned and directed into different, but overlapping, portions of a catalyst attached to said flow director and catalyst mount, such that a uniform flow distribution is achieved through the catalyst.

4. An exhaust flow director and catalyst mount according to claim 1, wherein said collector chamber, said exhaust flanges, and said exhaust runners are arranged such that a fastener driver having a plurality of parallel spindles may be used to simultaneously drive a plurality of fasteners for attaching said exhaust flow director and catalyst mount to a cylinder head of an engine.

5. An exhaust flow director and catalyst mount according to claim 1, wherein the included angle between said outlet structure of said collector chamber and the plane of said plurality of exhaust flanges is approximately 45 degrees.

6. An exhaust flow director and catalyst mount according to claim 1, wherein said outlet structure of said collector chamber and said exhaust runners are generally coplanar.

7. An exhaust flow director and catalyst mount according to claim 1, wherein said outlet structure of said collector chamber is configured for direct mounting of an exhaust catalyst.

8. An exhaust flow director, catalyst mount, and exhaust treatment catalyst for an internal combustion engine, comprising: a collector chamber having an outlet flange adapted for connection with an exhaust treatment catalyst;a plurality of exhaust flanges adapted for mounting to a plurality of exhaust ports exiting from a cylinder head of an engine;a plurality of exhaust runners, with one of said runners extending from each of said exhaust flanges to said collector chamber;an exhaust treatment catalyst attached directly to said outlet flange; anda plurality of transitional guide vanes, located within said collector chamber, for directing exhaust gases flowing through said runners and into said catalyst, with said guide vanes being configured so as to cause the parallel flow exhaust gas velocity profile through said catalyst to be generally invariant.

9. An exhaust flow director, catalyst mount, and exhaust treatment catalyst according claim 8, wherein said exhaust treatment catalyst comprises at least one monolithic substrate.

10. An exhaust flow director, catalyst mount, and exhaust treatment catalyst according to claim 8, wherein said exhaust treatment catalyst comprises a plurality of monolithic substrates.

11. An exhaust flow director, catalyst mount, and exhaust treatment catalyst according to claim 8, wherein said outlet flange of said collector chamber and said exhaust flanges are generally coplanar.

12. A reciprocating internal combustion engine for an automotive vehicle, comprising: a cylinder block;a cylinder head mounted upon said cylinder block; andan exhaust flow director, catalyst mount, and exhaust treatment catalyst, comprising: a collector chamber having an outlet flange adapted for connection with an exhaust treatment catalyst;a plurality of exhaust flanges adapted for mounting to a plurality of exhaust ports exiting from said cylinder head;a plurality of exhaust runners, with one of said runners extending from each of said exhaust flanges to said collector chamber;an exhaust treatment catalyst attached directly to said outlet flange, with said catalyst having a front face adjoining the collector chamber; anda plurality of transitional guide vanes, located within said collector chamber, for directing exhaust gases flowing through said runners and into different portions of said catalyst, such that a uniform flow distribution is achieved over the front face of the catalyst.

13. An internal combustion engine according to claim 12, wherein said exhaust runners and said outlet flange are arranged in a coplanar configuration.

14. An exhaust flow director and catalyst mount for an internal combustion engine, comprising: a collector chamber having an outlet flange adapted for direct connection with an exhaust treatment catalyst;a plurality of exhaust flanges adapted for mounting to a plurality of exhaust ports exiting from a cylinder head of an engine; anda plurality of exhaust runners, with one of said runners extending from each of said exhaust flanges to said collector chamber, with said exhaust runners and said outlet flange being configured such that said outlet flange and said runners are generally coplanar.

15. An exhaust flow director and catalyst mount according to claim 14, further comprising a plurality of transitional guide vanes, located within said collector chamber, for directing exhaust gases flowing through the runners and into different portions of said collector chamber.

16. An exhaust flow director and catalyst mount according to claim 14, wherein said flow director and catalyst mount comprises cast metal.

17. An exhaust flow director and catalyst mount according to claim 16, wherein said flow director and catalyst mount comprise cast ferrous metal.