Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal between parts of internal combustion engine
Patent
1998-06-02
2000-11-07
Knight, Anthony
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal between parts of internal combustion engine
277595, F16J 1508, F02F 1100
Patent
active
06142482&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an improvement of a cylinder head gasket of an engine.
BACKGROUND OF THE INVENTION
A cylinder head gasket is known in the art comprising a pair of gasket baseplates held sandwiched between a cylinder head and a cylinder block and having a combustion opening formed therein in alignment with a cylinder bore, a spacer disposed around the cylinder bore to surround it in an endless manner and held sandwiched between the pair of gasket baseplates and a full bead and/or half bead formed at a suitable location or locations on the gasket baseplates (Japanese Laid-Open Utility Model Application No. 71,865/1992 and Japanese Laid-Open Patent Application No. 165,167/1992).
In the prior art, when only gasket baseplates are provided which are formed with a full bead and a half bead, they are readily susceptible to the influence of any blowhole in the casting or flaw on mating adjoined surface, causing likelihood that the sealing performance becomes degraded.
DISCLOSURE OF THE INVENTION
In view of the foregoing, the invention provides a cylinder head gasket which assures and maintains a good sealing performance in the presence of any blowhole in the casting or flaw on the mating adjoined surface.
Specifically, in accordance with the invention, there is provided a cylinder head gasket comprising a pair of gasket baseplates held sandwiched between a cylinder head and a cylinder block and having a combustion opening formed therein in alignment with a cylinder bore, a spacer disposed around the cylinder bore to surround it in an endless manner and held sandwiched between the pair of gasket baseplates, and a full bead and a half bead formed on each of the pair of gasket baseplates in a region overlapped by the spacer, the spacer as well as the full bead and the half bead on the respective gasket baseplates being continuously held sandwiched between the cylinder head and the cylinder block along the circumference of the cylinder bore.
With the described arrangement, the full bead and the half bead on each of the gasket baseplates disposed around the combustion chamber opening are held sandwiched between the cylinder head and the cylinder block, and the spacer is interposed therebetween in such region. This allows the full bead and the half bead to abut against the mating member under a high surface pressure and over an increased area of contact, with consequence that they are less susceptible to the influence of any gross porosity in the casting or flaw on the mating adjoined surface, thus enabling a good sealing performance to be secured.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal section of a first embodiment of the invention;
FIG. 2 is a plan view of cylinder head gasket 1 shown in FIG. 1;
FIG. 3 is a cross section, to an enlarged scale, of a pertinent portion shown in FIG. 1; and
FIG. 4 is a longitudinal section of a second embodiment of the invention.
BEST MODES FOR CARRYING OUT THE INVENTION
The invention will now be described below with reference to an embodiment applied to a linear four cylinder engine.
Referring to FIGS. 1 and 2, a cylinder head gasket 1 comprises a pair of gasket baseplates 2 having four combustion chamber openings 3A formed therein in alignment with respective cylinder bores 2 (see FIG. 1) and a spacer 4 disposed between the pair of gasket baseplates 3 to be held sandwiched therebetween.
The spacer 4 is disposed around each cylinder bore 2 to surround it in an endless manner. However, in the embodiment shown, because a spacing between the cylinder bores 2, and hence, between the combustion openings 3A is reduced, four spacers 4 are integrally connected together between adjacent combustion openings 3A so as to be continuous to each other. Where there is an increased spacing between the combustion openings 3A, it will be obviously seen that the four spacers may be separate from each other.
In a region overlapped by the spacer 4, each gasket baseplate is formed with a full bead 3a and a half bead 3b, each of which surrounds the respec
REFERENCES:
patent: 5058908 (1991-10-01), Udagawa
patent: 5213344 (1993-05-01), Udagawa
patent: 5215316 (1993-06-01), Udagawa
patent: 5306024 (1994-04-01), Udagawa
patent: 5575245 (1996-11-01), Watanabe
patent: 5664790 (1997-09-01), Tanaka et al.
Fujiki Ryosuke
Goto Eisaburo
Nakata Kazuya
Shinpo Yoshikazu
Yamaguchi Kenichi
Beres John L.
Knight Anthony
Taiho Kogyo Co. Ltd.
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