Cylinder block for an internal combustion engine

Details Cylinder block for an internal combustion engine Cylinder block for an internal combustion engine

1994-05-16

1996-03-26

Macy, Marguerite

Internal-combustion engines

Particular piston and enclosing cylinder construction

123195R, F02F 136

Patent

active

055011896

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a cylinder block for an internal combustion engine, having at least two contiguous cylinders that are surrounded by a water cooling jacket and supported on the upper part of the piston housing.
In piston engines, particularly piston engines for passenger cars, an objective is to reduce the weight as much as possible. Therefore the practice was adopted of manufacturing the cylinder blocks from a light metal, a consequence of which, however, was that two materials must be used, because the bushings had to be manufactured with corresponding cast iron grades.
It is the object of the invention to conceptualize a cylinder block of the type mentioned at the outset as a light block that has high shape-retaining strength and can be manufactured from cast iron.


SUMMARY OF THE INVENTION

This object is attained in accordance with the invention in that, between two cylinders in the dividing plane, the respective outside of the water cooling jacket has a reinforcing rib that is U-shaped in cross-section and continues into the region of the upper part of the crankcase. The effect of this structure is that the forces acting between the cylinder head and the crankshaft support and to be taken up by the cylinder block can be taken up primarily by this reinforcing rib, so all of the remaining wall parts can be configured to be noticeably thinner. The material weight to be used for the U-shaped reinforcing ribs is less than the weight reduction achieved by means of a reduction in the wall thicknesses of the upper part of the crankcase and the housing jacket between the upper part of the crankshaft and the water cooling jacket. It is advantageous here that the inside of the U-profile extends at the upper end in an extension of the bores for the cylinder head studs. In in-line engines, the inside of the U-profile ends at the lower end in an extension of the bores for the fastening screws of the crankshaft support. In V engines, the U-profile ends respectively in the region of the crankshaft support. Because it is primarily the cylinder head studs on the one side and the region of the crankshaft support on the other that must take up the forces active in operation, a defined, linear flux of force results between the cylinder head and the crankshaft support, which flux permits a strength calculation with sufficient precision so that, in dimensioning the remaining, extensively planar parts of the cylinder block that serve as a jacket, the wall thickness practically need only be taken into consideration with respect to problem-free castability.
In an advantageous embodiment of the invention, the reinforcing ribs respectively extend on the top side of the support web from the crankshaft bearing into the foot region of the cylinder block. The resulting increase in shape-retaining strength likewise permits a corresponding reduction in weight.
In a further embodiment of the invention, a jacket rib is provided that adjoins the reinforcing rib of the foot region in the dividing plane, on the inside of the housing jacket. Subsequently, with the given thin-walled configuration of the housing jacket, a reinforcement is achieved, particularly in in-line engines that have at least two cylinders and V engines, by means of which the tendency of this jacket surface to vibrate is reduced, thus preventing roaring. It is also advisable for the jacket rib to have a U-shaped profile in cross-section.
In a further advantageous embodiment of the invention, at least one of the reinforcing ribs having a U-shape in cross-section is configured, at least in the region of the contiguous cylinders, as a closed channel by means of a cover; this channel is provided at the upper end with an inlet opening in the joining plane for the cylinder head, and at the lower end with an outlet opening, forming an oil return channel. This permits at least one oil return channel to be integrated into the cylinder block with the utilization of the already present reinforcing ribs, which channel has a large absorption ca

REFERENCES:
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patent: 4108135 (1978-08-01), Kubis
patent: 4369739 (1983-01-01), Umemura et al.
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patent: 4771745 (1988-09-01), Nakamura et al.
patent: 4773366 (1988-09-01), Seidl et al.
patent: 5115791 (1992-05-01), Dore
patent: 5148742 (1992-09-01), Kramer et al.
patent: 5188071 (1993-02-01), Han

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