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US 4,230,087 AGranted
Low-noise-level internal combustion 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 integrally formed or cast engine block having an upper half of main bearings for receiving the journal of a crankshaft, a bearing support frame secured to the bottom portion of the engine block and having a lower half of the main bearings, and a sound-insulating cover secured to the outer surface of the engine block to cover the lower part of the engine block, so that the engine noise and vibration can be effectively decreased.
Claims11
A reciprocating piston internal combustion engine, comprising:
- an integrally formed engine block including a cylinder block portion which is formed therein with cylinders, and a cylinder hed portion, said cylinder block portion carrying a generally semicylindrical part of each of main bearings for supporting the rotatable journal of a crankshaft;
- pistons reciprocally disposed in said cylinders, respectively, a combustion chamber being defined between the crown of each piston and said cylinder head, the piston stroke of each piston being the same as or smaller than the bore diameter of each cylinder
- a bearing support frame secured to said cylinder block portion of said engine block, and carrying the other generally semicylindrical part of each of the main bearings, the semicylindrical part carried by said bearings support constituting a generally cylindrical main bearing in cooperation with the semicylindrical part carried by said cylinder block portion;
- and
- a sound-insulating cover elastically secured to said engine block in spaced relation to and around the engine block to cover the outer surface of the cylinder block portion of said engine block.
2 more elements
Dependencies are inferred from the claim text.