Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Reexamination Certificate
1999-09-14
2001-04-24
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...
C060S304000
Reexamination Certificate
active
06220020
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a secondary air supply passage structure for use in an engine exhaust purification system.
2. Description of the Background Art
Japanese Patent Laid-Open Publication No. Hei. 9-324624 shows an engine with a reed valve chamber provided on a cylinder head. A secondary air supply passage connects the reed valve chamber and an exhaust port. The secondary air supply passage is roughly parallel to a cylinder axis of the cylinder head.
It is desirable that the secondary air supply passage be formed as close as possible to a right angle with regard to the head gasket surface. By forming the secondary air supply passage at a right angle, the secondary air supply passage can be formed by a machine processing. One drawback is that when the secondary air supply passage has an end passing through the exhaust gas port, it is highly likely that the secondary air supply passage will interfere with the cam area at the top of the cam shaft. Therefore, the process of forming the secondary air supply passage becomes extremely difficult. Furthermore, if a pinch angle between the valves is narrowed, the process becomes even more difficult.
SUMMARY OF THE INVENTION
It is an object of the present invention to solve one or more of the drawbacks associated with the background art.
It is a further object of the present invention to provide a cylinder head with a secondary air supply passage oriented in an optimum direction which is easy to manufacture.
It is a further object of the present invention to provide a cylinder head with a secondary air supply passage wherein a pinch angle between an air supply valve and an exhaust valve can be made small.
It is a further object of the present invention to provide a cam holder with a secondary air supply passage which bends in direction and which is easy to manufacture.
These and other objects of the invention are fulfilled by an exhaust purification device for attachment to an internal combustion engine comprising: a cylinder head; an exhaust gas port formed in said cylinder head and establishing an exhaust gas flow path; an exhaust gas induction guide formed in said exhaust gas port, said exhaust gas induction guide being a recess formed in a side wall of the exhaust gas port extending in a direction away from the exhaust gas flow path; and a secondary air supply passage formed in said cylinder head which opens to a first outer side of said cylinder head and to said exhaust gas induction guide to provide secondary air to said exhaust port.
Further, these and other objects of the invention are fulfilled by an engine comprising: a cylinder having a combustion end and a crankcase end; a piston reciprocating along a first direction within said cylinder; a cylinder head having a first end and a second end, with said first end being attached to said combustion end; an exhaust gas port formed in said cylinder head and establishing an exhaust gas flow path; an exhaust gas induction guide formed in said exhaust gas port, said exhaust gas induction guide being a recess formed in a side wall of the exhaust gas port extending in a second direction away from the exhaust gas flow path; and a secondary air supply passage in said cylinder head which opens to said exhaust gas induction guide to supply secondary air to said exhaust port.
Moreover, these and other objects of the invention are fulfilled by a method of forming internal combustion engine parts comprising the steps of: providing a cylinder head cast having an exhaust port core with a protrusion integrally formed on the exhaust port core; casting a material using the cylinder head cast to form a cylinder head with an exhaust port corresponding to the exhaust port core and an exhaust induction guide formed on a side of the exhaust port corresponding to the protrusion; and forming a main secondary air supply passage from a first outer side of the cylinder head to the exhaust induction guide on the side of the exhaust port to provide secondary air to the exhaust port.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 4417442 (1983-11-01), Ikenoya et al.
patent: 4450684 (1984-05-01), Otani et al.
patent: 4476676 (1984-10-01), Ikenoya et al.
patent: 4499724 (1985-02-01), Ikenoya et al.
patent: 4727717 (1988-03-01), Ikenoya et al.
patent: 5657628 (1997-08-01), Takeuchi
patent: 55-146224 (1980-11-01), None
patent: 57-13213 (1982-01-01), None
patent: 9-324624 (1997-12-01), None
Mizumura Sakae
Takahashi Katsunori
Birch & Stewart Kolasch & Birch, LLP
Denion Thomas
Honda Giken Kogyo Kabushiki Kaisha
Nguyen Tu M.
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