Structure of an open deck type cylinder block

Details Structure of an open deck type cylinder block Structure of an open deck type cylinder block

1997-07-21

1998-09-22

Lo, Weilun

Internal-combustion engines

Cooling

With jacketed head and/or cylinder

1231933, F02F 100

Patent

active

058099468

ABSTRACT:
To prevent deformation, in the upper portions of cylinder bores, that occurs when the cylinder head is mounted on the cylinder block by using head bolts and to prevent deformation in the upper portions of the cylinder bores caused by the thermal expansion of the cylinder head. In an open deck type cylinder block of an internal combustion engine in which the cylinder bores are separated from the outer shell of the cylinder block by water jackets in the upper deck, thick portions are formed near the ends of the cylinder bores located at both ends of the internal combustion engine in the direction of the crank shaft, the end portions being opposed to the outer shell of the cylinder block in the axial direction of the crank shaft, the thick portions being smoothly continuous with the outer shell of the initial cylinder bores. The thick portions have the greatest thickness at the ends in the direction of the crank shaft. A decreased-diameter portion having a thickness smaller than that of the upper portions is formed in the lower portions of the cylinder bores neighboring the regions where the thick portions are formed, and the decreased-diameter portion and the ordinary cylinder bores of the upper portions thereof are connected together through the tapered portion to decrease the weight of the cylinder block.

REFERENCES:
patent: 4394850 (1983-07-01), Hayashi
patent: 4686943 (1987-08-01), Anno et al.
patent: 4712517 (1987-12-01), Anno et al.

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