Cylinder block structure for internal combustion engine

Patent · Tue Sep 29 04:00:00 EDT 1987

OSTI ID:5820003

Kohno, K; Takubo, H; Ito, T

This patent describes a cylinder block structure for an internal combustion engine having a top part on which a cylinder head defining a head chamber with a cylinder-head cover mounted thereon is to be mounted, a lower part on which an oil pan is to be mounted, cylinder bores in which pistons are to be inserted, and partition walls which are provided between adjacent cylinder bores to support a crank-shaft. The improvement comprises a balancer case which is formed on a side wall of the cylinder block integrally therewith to accommodate a balance shaft which is provided with a balance weight and is operatively connected to the crankshaft to be driven thereby, and a blowby passage which communicates between an interior of a crankcase in the cylinder block and the head chamber defined by the cylinder head and the cylinder-head cover to be mounted thereon. The interior of the balancer case forms a part of the blowby passage, wherein the balancer case is formed at a position higher than the position where the crankshaft is supported. The balancer case extends through the partition walls between the cylinders and the blowby passage communicating with the head chamber opens to the balancer case in one of the partition walls.

• Assignee: Mazda Motor Corp.
• Patent Number(s): US 4696267
• OSTI ID: 5820003
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMBUSTION CHAMBERS
CONTAINERS
CYLINDERS
DESIGN
ENGINES
HEAT ENGINES
INSTALLATION
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MECHANICAL STRUCTURES
POSITIONING
SHAFTS
SUPPORTS