Exhaust manifold device

Details Exhaust manifold device Exhaust manifold device

1998-07-10

2000-09-19

Denion, Thomas

Power plants

Internal combustion engine with treatment or handling of...

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

60292, 60324, 60307, 60319, 137512, 1375137, 137550, F01N 300

Patent

active

061194549

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to exhaust manifold devices.
2. Description of the Related Art
The invention relates more particular to devices that are arranged to automatically allow air to enter the exhaust manifold to prevent inter alia exhaust gases being sucked into engine cylinders during the normal operation of the engine. Such devices or aspirators have been disclosed already in, for example, U.S. Pat. No. 3,455,106 and European Patent 0041831. Devices so far proposed comprise relatively complicated mechanical arrangements and do not operate efficiency at higher engine speeds or at a variety of engine speeds.
It is an object of the invention to overcome or at least reduce these problems,
According to the invention there is provided an aspirator for allowing air automatically to selectively enter an engine exhaust manifold during operation of an internal combustion engine to inhibit exhaust gases being drawn back into the cylinders via exhaust valves, the aspirator comprising an adapter that fits to the manifold having a port in communication with the manifold, a first one way valve fitted to the adapter that prevents gases leaving the manifold through the port when the pressure inside the manifold is greater than the pressure at the first valve, and a second one way valve connected by a passageway to the first valve, the second one way valve being arranged to allow air to enter the passageway whenever the pressure inside the passageway is less than the pressure at the second valve; and means for supplying air to the second valve at different pressures, above atmospheric pressure, that increase with increases of speed of the engine.
The aspirator may comprise a hollow body that extends to the port fitted to the manifold and the port be formed in a tube that extends somewhat in to the manifold beyond its inner surface.
The hollow body may be formed with an intermediate expansion chamber.
The one way valves may each comprise a needle valve.
The passageway is preferably formed with an intermediate expansion chamber.
The position of the second one way valve may be manually adjustable to vary the differential pressure at which the second valve opens and closes.
The air may be supplied to the second one way valve by an air ram having an inlet exposed forwardly in a vehicle in which the engine is mounted so as to provide air at a pressure corresponding to the forward speed of the vehicle.
The air may also or alternatively be supplied by an air pump, and the air pump may form part of a turbo charger for the engine.
An exhaust manifold device or aspirator according to the invention will now be described by way of example with reference to the accompanying schematic drawings in which:


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional side view of an adapter of the device;
FIG. 2 in a sectional side view of the device which fits above the adapter in use;
FIG. 3 is a top plan view of an exhaust manifold; and
FIG. 4 is a top plan view of the device in a turbo charger application of the device.


DETAILED DESCRIPTION OF THE DRAWINGS

Referring to the drawings, in FIG. 1 the adapter comprises a lower part 10 including a port 11 that screw fits to an engine manifold 12. The lower part incorporates an expansion chamber 13 that is closed off by hollow cap 14 extending up to a gland fitting 15 which seals and connects the cap 14 to a cylindrical tube 16.
It will be noted that the bottom edge of the port 11 extends somewhat into the manifold 12 and beyond its inner surface. This makes the port more sensitive to the flow of gases and pressure in the manifold. Also, hot exhaust gases are less inclined to be swept into the port 11 and corrode valve seatings in the device. The provision of the expansion chamber 13 ensures that any flow of air towards the manifold is accelerated and so "rammed" through the port 11, when required, into the manifold.
In FIG. 2, the tube 16 is attached to a lower housing 17 incorporating a first one way needle valve 18 by a gland coupling

REFERENCES:
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patent: 3871175 (1975-03-01), Yamamoto
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patent: 4162613 (1979-07-01), Tamura et al.
patent: 4257227 (1981-03-01), Sato et al.
patent: 4534173 (1985-08-01), Tsukamoto
patent: 5177958 (1993-01-01), Clemens et al.
patent: 5421366 (1995-06-01), Naffziger et al.
patent: 5499502 (1996-03-01), Haniu et al.
patent: 5699664 (1997-12-01), LaFleur
Copy Not Presently Available Patent Abstracts of Japan, vol. 095, No. 010, Nov. 30, 1995.
Copy Not Presently Available Patent Abstracts of Japan,vol. 012, No. 182, May, 27, 1988.

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