Coupling mechanism between exhaust pipe and catalytic converter

Details Coupling mechanism between exhaust pipe and catalytic converter Coupling mechanism between exhaust pipe and catalytic converter

1999-12-21

2001-06-19

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S324000

Reexamination Certificate

active

06247304

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an engine exhaust system and, more particularly, to a coupling mechanism between an exhaust pipe and a catalytic converter of the engine exhaust system.
BACKGROUND OF THE INVENTION
FIGS. 7 and 8
show a conventional exhaust system including a close-coupled catalytic converter.
A catalytic converter
52
is connected at its upstream end to an exhaust manifold
51
by an inlet connector
53
and at its downstream end to an exhaust pipe
56
by an outlet connector
54
.
The inlet connector
53
is coupled at its first end to a mixing pipe
55
extending from the exhaust manifold
51
and at its second end to an inlet of the converter
52
.
The outlet connector
54
is coupled at its one end to the exhaust pipe
56
and at its other end to the catalytic converter
52
. The outlet connector
54
is bent at about 80 degrees with respect to a central axis C of the catalytic converter
52
. In addition, the bent portion of the outlet connector
54
is designed such that a central axis D thereof intersects the central axis C of the catalytic converter
52
to increase the degree of free layout of an engine.
However, in the above described conventional exhaust system, since the diameter is of the outlet connector
54
at a portion of the same connected to the exhaust pipe
56
abruptly decreases for suitable connection with the exhaust pipe
56
, pressure passing through the catalytic converter
52
is rapidly reduced at the portion where the diameter of the outlet connector
54
is reduced. This deteriorates overall engine performance since backpressure is increased.
SUMMARY OF THE INVENTION
The present invention has been made in an effort to solve the above-described problems.
It is an objective of the present invention to provide an exhaust system that can improve engine performance by preventing backpressure from being increased.
To achieve the above objective, the present invention provides an automotive exhaust system comprising an exhaust manifold, an exhaust pipe, and a catalytic converter connected at its upstream end to the exhaust manifold by an inlet connector and at its downstream end to the exhaust pipe by an outlet connector, wherein the outlet connector is cone-shaped having a spiral outline.
The outlet connector is, when viewed from a front side, curved by 55-65 degree with respect to an x-axis which is a central longitudinal axis of the catalytic converter, and when viewed from a plane view, curved by 40-55 degrees with respect to a z-axis.
The outlet connector has an ellipse-shaped opening on an end connected to the catalytic converter and on an end connected to the exhaust pipe.


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