Internal combustion engine with reinforced engine block

Details Internal combustion engine with reinforced engine block Internal combustion engine with reinforced engine block

1995-10-04

1997-10-14

McMahon, Marguerite

Internal-combustion engines

Frame construction

Horizontal cylinder

F02F 700, F02F 100, F01B 3100, F16M 1021

Patent

active

056761058

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

In operation, piston engines, in particular piston internal combustion engines, are excited to vibrate by the changing events in the cylinder chamber, such as the course of combustion, but also by mechanical influences; the vibrations are also radiated as noise at the surfaces of the piston engine in the form of airborne noise and/or are transmitted via the bearings of the piston engine into the substructure or the body in vehicles as structure-borne sound.
Abatement of noise emissions of this kind is sought, because of their disadvantageous effects on man and the environment. German Patent Disclosure DE-A-28 49 613 attempts to produce a noise shield by providing an elastic acoustical insulation enclosure, which is attached to the engine block of a piston internal combustion engine. Furthermore, German Patent Disclosure DE-A-28 01 431 suggests supporting the entire piston internal combustion engine in an outer tublike casing with the aid of support elements, which insulate structure-borne sound. A disadvantage of such an acoustical insulation measure is that it contains a large part of the machine and therefore hinders the installation of add-on parts and/or additional units, such as engine mounts, starter, generator, or gas supply lines and gas exhaust lines. In this connection, in many cases, it is impossible to prevent the breaching of acoustical insulation enclosures of this kind in order to install add-on parts of this kind and/or additional units, which reduces its effectiveness. Furthermore, acoustical insulation measures of this kind reduce the heat tolerance of a piston internal combustion engine.
On account of the above mentioned disadvantages, there have been attempts to combat noise propagation by seeking to prevent or at least to reduce the generation of noise. In addition to reducing sources of excitation, for example by optimizing the combustion process, it makes sense primarily to reduce the noise transmission and noise radiation at the surfaces of the piston engine. This is achieved by embodying the piston engine as rigidly as possible, particularly making it resistant to bending or torsionally rigid, especially in its thin-walled regions; the oscillatory faces are embodied to be as small and/or thick-walled as possible with regard to airborne noise radiation. Not only is there then an undesired increase in weight, particularly resulting from an increase in wall thickness, primarily in cast components, but increased casting defects such as bubbles or pores or the like also occur. That is why German Patent Disclosure DE-A-35 44 215 has already suggested improving the rigidity of the engine block as a whole with a system of reinforcement ribs on the side walls in the cylinder region. As a result, undesired casting defects can be prevented by embodying the ribs in this way, and high rigidity of the cylinder block can be achieved.
German Patent Disclosure DE-A-40 17 139 suggests the concept of achieving the required rigidity of the engine block via the purposeful installation of bands and ribs. According to this proposal, this is achieved in particular by binding the crankshaft bearings to the cylinder block and to the side walls of the crankcase via a multitude of reinforcing ribs, so that the rigidity of the engine block structure as a whole is increased. However, this entails a corresponding increase in weight. From an economical standpoint, a weight increase is to be avoided.


SUMMARY OF THE INVENTION

The object of the invention, now, is to reduce the vibration and noise generation of a piston engine, in particular of a piston internal combustion engine, by the configuration of the engine block structure; the overall weight must not be increased, if at all possible.
The object is attained according to the invention with a piston engine, in particular a piston internal combustion engine, in which cylinders, pistons, crankshaft, and crankshaft bearings are disposed in an engine block, and regions on the engine block are provided with cap- and/or cup-shaped cove

REFERENCES:
patent: 3817354 (1974-06-01), Meiners
patent: 4454842 (1984-06-01), Ogawa
patent: 4465041 (1984-08-01), Hayashi
patent: 4466401 (1984-08-01), Ogawa et al.
patent: 4467755 (1984-08-01), Hayashi
patent: 4473042 (1984-09-01), Kikuchi
patent: 5107809 (1992-04-01), Suh
patent: 5218938 (1993-06-01), Miller et al.
patent: 5404847 (1995-04-01), Han

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