US 4,911,118 AGranted

Cylinder block reinforcement construction for engine

AssigneeMazda Motor Corporation

InventorsTakeshi Kageyama, Arata Matsue

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Abstract

A cylinder block reinforcement construction for an engine includes a reinforcement member fixed to a skirt portion of a cylinder block of the half-skirt type and fastened to each of bearing caps bearing the crankshaft of the engine. The reinforcement member is formed in a platelike configuration and a substantially dishlike sectional shape and includes a bottom face portion, side face portions rising from both side ends of the bottom face portion, and flange portions provided at upper edges of the side face portions so as to be fastened to the skirt portion. The reinforcement member is provided, at positions corresponding to respective of the bearing caps and spaced in the axial direction of the crankshaft, with protuberant portions for attachment to respective of the bearing caps. The bottom face portion may be provided with bottom vent holes, each being provided between adjacent of the protuberant portions at a position corresponding to the respective cylinder. The area of each bottom hole at a location where the piston disposed directly thereabove is accompanied by an adjacent piston reciprocated in phase therewith is greater than the area of bottom holes at other locations.

Claims19

Dependent claims

A cylinder block reinforcement construction for an engine comprising a cylinder block of the half-skirt type in which the lower end of a skirt portion of the block fixed to an oil pan of the engine is located above the lower ends of bearing caps supporting a crankshaft of the engine, and a reinforcement member disposed inside the oil pan and fastened to the lower end of the skirt portion, wherein:

said reinforcement member is formed in a platelike configuration and a substantially dishlike cross-sectional shape, said reinforcement member comprising a bottom face portion, side face portions rising from both side ends of said bottom face portion, and flange portions provided at upper edges of said side face portions so as to be fastened to the lower end of the skirt portion as viewed in the axial direction of the crankshaft;
said reinforcement is provided with end protuberant portions at both end portions thereof with respect to the axial direction of the crankshaft, said end protuberant portions each being protuberant inwardly from said bottom face portion and said side face portions and comprising an opposing surface formed in a substantially dishlike cross-sectional shape, as viewed in the axial direction of the crankshaft, each said opposing surface being opposed to the lower surface and side surfaces of a respective end bearing cap and being in continuity with said flange portions;
said protuberant portions are each provided with a portion for fastening to the lower surface of the respective end bearing cap;
and
a middle protuberant portion is provided between said end protuberant portions opposite to the lower surface of each bearing cap between the end bearing caps and in continuity with said side face portions.

2 more elements

A cylinder block reinforcement construction for an engine comprising a cylinder block of the half-skirt type, and oil pan, and a reinforcement member fixed between a skirt portion of the cylinder block and the oil pan, said reinforcement member being fastened to bearing caps supporting a crankshaft, wherein:

said reinforcement member is formed in a platelike configuration and a substantially dishlike cross-sectional shape, said reinforcement member comprising a bottom face portion, side face portions rising from both side ends of said bottom face portion, and flange portions provided at upper edges of said side face portions so as to be fastened to the lower end of the skirt portion;
said reinforcement member is provided with protuberant portions at positions corresponding to each bearing cap in the axial direction of the crankshaft, said protuberant portions, elongated orthogonally to the axial direction, having portions fastened to the bearing caps;and
said reinforcement member is provided in said bottom face portion thereof with bottom holes, each of said bottom holes being provided between adjacent said protuberant portions at a position corresponding to a respective cylinder of the block, and the area of each said bottom hole at a location where a piston disposed directly thereabove is accompanied by an adjacent piston reciprocated in phase therewith, is greater than the area of said bottom holes at other locations.

Dependencies are inferred from the claim text.

Facts

Application: 07/333,584Filed 5 Apr 1989
Priority: JP 63-822825 Apr 1988
Granted: 27 Mar 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F02F 7/008
Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety: sound insulation
F02F 7/0053
Arrangements of mechanical drive elements: crankshaft bearings fitted in the crankcase
F01M 2011/002
Oilsumps: with means for improving the stiffness
F02F 2007/0056
Crankshaft bearings fitted in the crankcase: using bearing beams, i.e. bearings interconnected by a beam or multiple beams