Internal-combustion engines – Multiple cylinder
Patent
1981-04-17
1983-10-18
Feinberg, Craig R.
Internal-combustion engines
Multiple cylinder
123 59R, F02B 7518
Patent
active
044099347
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an intake manifold of the type having a distribution chamber with essentially equally long individual intake pipes extending therefrom in two groups arranged approximately symmetrically to each other, the intake pipes having initial portions emanating from the distribution chamber approximately in one plane in pairwise mutual opposition, continuously curved intermediate portions, and mutually parallel end portions extending in the same direction with coupling ends for inlet ducts of an engine, the end portions extending approximately at a right angle to the initial portions and substantially in a plane approximately parallel to the plane of the initial portions.
In conventional intake manifolds of this type of structure and similar types of construction (DOS No. 1,526,707, DOS No. 2,711,195, and U.S. Pat. No. 2,862,490), the curved intermediate portions adjoining the initial portions are always curved out of the plane of the initial portions in the direction toward the plane of the end portions, whereby the intended close, mutual spatial overlapping of the individual intake pipes is enhanced. However, such known arrangements are disadvantageous in that the intake pipe lengths, with a specific space requirement for the intake manifold, and due to the shaping conditions for an integrally manufactured casting are restricted and thus are not in all cases adequate for adaptation to the respectively necessary length.
It is an object of the invention to arrange the curved intermediate portions of the individual intake pipes with respect to their course in such a way that the total length of the intake pipes can be still further increased without considerable additional space requirement and without a close mutual spatial overlapping of the intake pipes impeding the one-piece casting manufacture, while at the same time providing that the individual intake pipes have an adequately large radii of curvature.
The invention attains this object in a surprisingly simple way which, however, is not made obvious by the state of the art by forming the intermediate portions of all intake pipes with first elbows which start with the initial portions arranged within the one plane of the initial portions of the intake pipes and extend in directions that have components that are directed away from the end portions, and wherein further elbows adjoin the intermediate portions and form an approximately U-shaped connection with the end portions. In this way, the intake pipes extend over their entire length within each group extensively mutually in parallel, wherein merely the mutual spacings, as seen over the length, initially decrease and then again increase. It is advantageous for the space requirement of the intake manifold that here the intake pipes of the end portions located externally in series determine the largest longitudinal dimension of the intake manifold installation, while these externally located intake pipes with their curved intermediate portions exhibit a smaller transverse dimension than the intake pipes for the end portions lying therebetween in the series. Thereby, a favorable space requirement is achieved for engine installation into automotive vehicles, because at both ends of the intake manifold there is space created for other auxiliary units.
In the conventional constructions according to DOS No. 1,526,707 and U.S. Pat. No. 2,862,490, the aforementioned spatial advantages are likewise provided; however, these constructions exhibit the spatial overlapping of the intake pipes, disadvantageous from the viewpoint of casting technique, as well as the small lengths of the intake pipes, disadvantageous for engine adaptation.
The drawing illustrates one embodiment of the invention. In the drawing:
FIG. 1 shows an end view of an intake manifold for a 6-cylinder in-line internal combustion engine,
FIG. 2 shows a top view of the intake manifold of FIG. 1,
FIG. 3 shows a lateral view of the intake manifold of FIGS. 1 and 2,
FIG. 4 shows a section along line IV--IV in FIG. 1, and
FIG. 5 shows a
REFERENCES:
patent: 2862490 (1958-12-01), Trisler
patent: 4175504 (1979-11-01), Ederer et al.
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