Cylinder of IC engine

Abstract

To equalize force holding a sleeve, by uniformizing wall thickness of cast thick parts of a cast cylinder block to eliminate solidifying time difference between cast thick parts in casting, in the cast cylinder block made from light alloy with which a sleeve is cast integrally. The iron cylinder sleeve 2 is cast integrally with an aluminum alloy cylinder block 1, and bolt holes 3a to 3d for tightening the cylinder block 1 are formed in an aluminum casting part covering an outer peripheral part 2a of the sleeve. Connection parts are wide and thick cast connection parts 6a to 6d and connects surrounding parts of the bolt holes 3a to 3d with the outer peripheral part 2a of the sleeve. Thinned parts 8a to 8d are formed in the wide and thick cast connection parts 6a to 6d to uniformize the wall thickness of the aluminum casting part covering the peripheral part 2a of the sleeve.

Description

Cylinder block for internal combustion engine technical field The present invention relates to a cylinder block for an internal combustion engine, and in particular to an improvement technology for a cylinder block of an air-cooled internal combustion engine. out of shape. Background technique The general shape of the cylinder block for internal combustion engines is shown in the perspective view of Figure 7. In most cases, light alloys such as aluminum alloys are used to integrally cast iron (cast iron) cylinder liners with circular cross-sections, or iron ( Cast iron) cylinder liners are press-fitted into cylinder bodies cast from light alloys such as aluminum alloys. The influence of the homogenization of the wall thickness has not been adequately considered. Generally, the periphery of the fixing bolt hole for fastening the crankcase and cylinder head of the cylinder block is provided as a cast part with increased rigidity for fastening, especially the position from...

AI Technical Summary

Problems solved by technology

The existence of the above-mentioned wide and thick-walled cast part in the light alloy of the cylinder block makes the wall thickness of the light alloy cast part such as aluminum alloy covering the outer peripheral part of the cylinder liner inconsistent. The expansion of the uniformity increases the time difference of the solidification time of the light alloy casting part such as aluminum alloy during the casting of the cylinder block. shrinkage, thermal deformation will remain, and since the light alloy casting part acts on the cylinder liner covering its outer peripheral part, an uneven force will act on the cylinder liner, which will have an adverse effect

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