Exhaust manifold

Details Exhaust manifold Exhaust manifold

1998-10-08

2000-10-24

Denion, Thomas

Power plants

Internal combustion engine with treatment or handling of...

Common receiver having inlets from plural cylinder

60332, F01N 710

Patent

active

061348864

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to an exhaust manifold including a curved end portion and at least two T-shaped portions connected to the curved portion through sliding fits, wherein the end portion and the T-shaped portions each are provided with a flange connection and a pipe connection, and wherein each T-shaped portion has a sliding fit connection piece.
2. Description of the Related Art
In an exhaust manifold of the above-described type, the flange connections of the T-shaped portions as well as of the end portion are connected to a head flange for connecting the exhaust manifold to a motor. In order to facilitate an expansion compensation, the end portion and the T-shaped portions are connected to each other through sliding fits. For this purpose, the sliding fit connection of a T-shaped portion engages over the end of the pipe connection of the end portion or over the end of the pipe connection of an adjacent T-shaped portion.
The T-shaped portions of the exhaust manifold are manufactured from a straight piece of pipe. For this purpose, using hydraulic high internal pressure, a connection piece-shaped bulge is produced which protrudes essentially perpendicularly from the pipe axis. This connection piece-shaped bulge is opened at the end thereof by means of a sawing cut. In this manner, the flange connection is manufactured. The sliding fit connection is formed by an end of the exit pipe.
The configuration described above has the disadvantage that the length of the flange connection is limited because of the fact that shaping is effected by means of hydraulic technology; specifically, the length is limited to at most one to two times the diameter of an exit pipe. A greater length of the flange connection could lead to an undue reduction of the thickness of the material. Consequently, the dimensions of other structural components must be adapted to the short flange length. This also makes it difficult to secure the head flange. Moreover, the assembly conditions for the exhaust manifold are impaired because the contact points for attaching the exhaust manifold to the motor are less easily accessible. Accordingly, the structural configuration and the technical use of such an exhaust manifold are limited.


SUMMARY OF THE INVENTION

Therefore, it is the primary object of the present invention to provide an exhaust manifold whose operability is improved.
In accordance with the present invention, each sliding fit connection piece is shaped by internal high pressure shaping at the outer radius of a curved section of the T-shaped portions.
Accordingly, it is the principal aspect of the invention that the sliding fit connection piece is produced by internal high pressure shaping at the outer radius of a curved section of the T-shaped portions.
A pipe bend is used for manufacturing a T-shaped portion. For manufacturing the sliding fit connection piece, initially a bulge is hydraulically produced at the outer radius of the curved section of the pipe bend. This connection piece is then opened by a sawing cut at the end of the connection piece. The sawing cut preferably extends obliquely relative to the vertical transverse plane of the bulge or the pipe connection of a T-shaped portion.
The flange connection of a T-shaped portion may have a length which is appropriate for the technical and structural requirements. This facilitates mounting of the head flange as well as the assembly of the exhaust manifold at the motor.
The length of each sliding fit connection piece may be relatively short. In practice, a ratio of the length of the sliding fit connection piece to the diameter of a curved section of about 0.3 to 0.7, preferably 0.5, has been found useful. In this manner, an advantageous manufacture of the sliding fit connection piece by hydraulic shaping technology is possible without having to expect an undue reduction of the thickness of the material.
The sliding fit between the end portion and the T-shaped portion connected to the end portion or between the T

REFERENCES:
patent: 4179884 (1979-12-01), Koeslin
patent: 4644747 (1987-02-01), Peterson
patent: 4831824 (1989-05-01), Fukazawa
patent: 5159811 (1992-11-01), Hefler et al.
patent: 5682741 (1997-11-01), Augustin et al.
patent: 5689954 (1997-11-01), Blocker et al.
patent: 5765878 (1998-06-01), Bonny et al.

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