Engine power section for piston engines, particularly V-engines

Details Engine power section for piston engines, particularly V-engines Engine power section for piston engines, particularly V-engines

1998-12-29

2000-10-24

Solis, Erick

Internal-combustion engines

Frame construction

Horizontal cylinder

123195A, 123195AC, 123195H, F02F 700

Patent

active

061350818

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION

The invention relates to an engine power section for piston engines, particularly V-engines.
For reducing the weight of an engine power section, it is basically known to manufacture the power unit block, which is highly loaded and is essentially formed of the cylinders with directly or indirectly shaped-on crankshaft bearings, preferably of an iron material, and to construct the less loaded power section walls separately of a lighter material or one which is manufactured with a particularly thin wall.
One example of this construction principle for the engine power section of a liquid-cooled internal-combustion engine is known from British Patent Document GB-PS 678 903, in which case the power section walls adjoining the crank space as well as the power section walls used for covering the cylinder coolant spaces are made of metal sheets. In contrast, for achieving the required stability, the power unit block has a relatively massive construction with end-side front walls between the cover plates and base plates of the cylinders, heavy bearing blocks being arranged in one piece on the base plate.
Disadvantages of this known engine power section and of the engine power section known from British Patent Document GB-PS 695 972 are in each case a moderate weight reduction as well as corrosion and sealing problems, particularly in the connection points of the structural components made of different materials. In addition, there are problems concerning acoustics.
For reducing particularly the acoustic problems, an engine power section for a liquid-cooled internal-combustion engine is known from U.S. Pat. No. 4,446,827 which comprises a power unit block which has a massive design corresponding to the above-mentioned British Patent Document GB-PS 678 903, to which separate power section walls are assigned which are made of a very sound-absorbing material, such as rubber, plastic or resin.
According to German Registered Utility Patent DE-U 94 12 637, corrosion and sealing problems for an engine power section of a liquid-cooled internal-combustion engine designed of different materials is avoided in that a light-metal power section is poured around a power unit block made of gray cast iron, the coolant spaces being constructed exclusively in the light metal power section. A disadvantage in this case is the massive design of the power unit block with engine baseboards arranged on the crankshaft bearing blocks by way of web-type supports, which baseboards are connected with the light metal power section in a material-locking manner in the oil pan connection area of the light metal power section. This heavy design results in another disadvantage in that these engine baseboards connected in a material-locking manner with the bearing blocks act as structure-borne noise bridges and acoustically excite at least the crank space covers of the light metal power section which are connected with them in a material-locking manner.
Further, from European Patent Document EP-A 0 554 575, which was published before German Patent Document DE-U 94 12 637, an engine power section for a liquid-cooled internal-combustion engine is known in the case of which a power unit block also made of gray cast iron is cast into a light metal power section. For reducing the weight of the power unit block, cylinders arranged in a row are arranged in a material-locking adjacent manner and carry massively designed bearing blocks arranged by way of spaced flat webs in the connection areas. During the casting into the light metal power section, the flat webs and the bearing blocks are integrated in a material-locking manner in transverse walls connected with the light metal power section. This support of the crankshaft bearings with respect to a crank space power section wall which is designed for reasons of stability and requires high expenditures of material acts as a structure-born sound bridge which acoustically excites the light metal power section.
Finally from Japanese Published Patent Application 4-121 443, a

REFERENCES:
patent: 2078056 (1937-04-01), Chapman

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