Breather device in internal combustion engine

Patent · Tue Aug 05 00:00:00 EDT 1986

OSTI ID:5248001

Hiraoka, S; Asanomi, K; Abe, R

This patent describes a crankcase ventilating system for a V-type, OHC internal combustion engine comprising a substantially hollow engine body structure having a pair of upwardly diverging cylinder banks and a downwardly facing opening, the engine body structure also having a pressure buffer chamber defined between opposed inner walls of the respective cylinder banks and a pair of opposite end walls with respect to the direction of an engine output shaft. The engine body structure further has engine cylinders, defined in each of the cylinder banks, and a cam chamber defined therein at a top portion of each of the cylinder banks at a location opposite to the downwardly facing opening; an oil pan secured to the engine body structure over the downwardly facing opening to define a crankcase; and intake system for the introduction of air into the engine cylinders through an air intake passage; first oil return passages defined in the engine body structure and communicating between each of the cam chambers and the buffer chamber; and a connecting passage means communicating between the buffer chamber and the crankcase. The connecting passage means consists of a blow-dry gas passage, having one end in communication with the crankcase and the other end in communication with the buffer chamber, an end of the buffer chamber opposite the blow-by gas passage opening at a height above the bottom of the buffer chamber, and a second oil return passage having one end in communication with the crankcase and the other end opening at the bottom of and in communication with the buffer chamber, the other end of the blow-by gas passage being located at a level above the bottom of the buffer chamber.

• Assignee: Mazda Motor Corp., Hiroshima
• Patent Number(s): US 4603673
• OSTI ID: 5248001
• Resource Relation: Patent File Date: Filed date 28 Feb 1985
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
INTERNAL COMBUSTION ENGINES
VENTILATION SYSTEMS
AIR FLOW
CYLINDERS
FLUID FLOW
GAS FLOW
INTAKE STRUCTURES
LUBRICATING OILS
SHAFTS
ENGINES
HEAT ENGINES
LUBRICANTS
MACHINE PARTS
MECHANICAL STRUCTURES
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
330100* - Internal Combustion Engines