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US 4,213,440 AGranted
Low-noise-level reciprocating piston engine
AssigneeNissan Motor Co., Ltd.
InventorsFumiyuki Abe, Yoshimasa Hayashi, Akira Kimura
Life of this patent
Estimating the term…
Abstract
A reciprocating piston internal combustion engine comprises an engine block formed with first bearing carrying portions which carry a group of upper generally semicylindrical parts of main bearings for supporting a crankshaft, and a bearing support block secured to the engine block and formed with second bearing carrying portions which carry a group of lower generally semicylindrical parts of the main bearing, so that the engine block is reinforced to prevent generation of engine noises due to low flexural rigidity of the engine block.
Claims19
A reciprocating piston internal combustion engine comprising:
- an engine block including a cylinder block portion in which engine cylinders are formed, and a cylinder head portion to close one ends of the cylinder to define combustion chambers between it and the crowns of pistons reciprocally disposed in the cylinders, respectively, said engine block being formed with first bearing carrying portions which carry a group of upper generally semi-cylindrical parts of main bearings for supporting the journal of a crankshaft mechanically connected to the pistons;
- and
- a bearing support block sealingly secured to said engine block and formed with a cavity to be filled with an engine lubricating oil for operating the engine so that said bearing support block serves as an oil pan, said bearing support block being formed with second bearing carrying portions which carry a group of lower generally semi-cylindrical parts of the main bearings, each lower generally semi-cylindrical part constituting a generally cylindrical main bearing in cooperation with each upper generally semi-cylindrical part.
A reciprocating piston internal combustion engine comprising:
- an engine block including a cylinder block portion in which engine cylinders are formed, and a cylinder head portion to close one ends of the cylinders to define combustion chambers between it and the crowns of pistons reciprocally disposed in the cylinders, respectively, said engine block being formed with first bearing carrying portions which carry a group of upper generally semi-cylindrical parts of main bearings for supporting the journal of a crankshaft mechanically connected to the pistons;
- and
- a bearing support block sealingly secured to said engine block and formed with a cavity to be filled with an engine lubricating oil for operating the engine so that said bearing support block serves as an oil pan, said bearing support block being formed with second bearing carrying portions which carry a group of lower generally semi-cylindrical parts of the main bearings, said bearing support block being rigid enough to securely support said second bearing carrying portions, each lower generally semi-cylindrical part constituting a generally cylindrical main bearing in cooperation with each upper generally semi-cylindrical part.
A reciprocating piston internal combustion engine comprising:
- an engine block including a cylinder block portion in which engine cylinders are formed, and a cylinder head portion to close one ends of the cylinders to define combustion chambers between it and the crowns of pistons reciprocally disposed in the cylinders, respectively, said engine block being formed with first bearing carrying portions which carry a group of upper generally semi-cylindrical parts of main bearings for supporting the journal of a crankshaft mechanically connected to the pistons;
- and
- a bearing support block sealingly secured to said engine block and formed with a cavity to be filled with an engine lubricating oil for operating the engine so that said bearing support block serves as an oil pan, said bearing support block being formed with second bearing carrying portions which carry a group of lower generally semi-cylindrical parts of the main bearings, said bearing support block being rigid enough to securely support said second bearing carrying portions, each lower generally semi-cylindrical part constituting a generally cylindrical main bearing in cooperation with each upper generally semi-cylindrical part, said bearing support block including a vessel portion in which said cavity is formed, a plurality of partition wall portions integral with said vessel portion to separate said cavity into a plurality of oil chambers, each parition wall portion being formed with said second bearing carrying portions and further formed with an opening which provides communication between adjacent two of the oil chambers.
Dependencies are inferred from the claim text.