System for blow-by gas return to the combustion chamber of an engine

A system for blow-by gas return to the combustion chamber of an engine having an oil separator with an inlet communicated with an outlet through a diffusion chamber and a filter element, said inlet communicating with the crankcase by an inlet pipe, and said outlet communicating with the intake manifold of the engine by an outlet pipe, comprising:

• a breather disposed on the cylinder head cover of said crankcase by an internal engine passage, and an outlet communicating with an inlet end of said inlet pipe;
• fixing means separate from said inlet and outlet pipe for fixing said oil separator upon said intake manifold;
• said inlet pipe communicating with said breather and with said oil separator, and an outlet pipe which connects said oil separator to said intake manifold disposed in a space over said cylinder head and said intake manifold;
• said diffusion chamber in said oil separator in communication with the atmosphere by an atmospheric passage, wherein said oil separator includes an oil separating chamber in which a filter element is disposed and a gathering chamber above the oil separating chamber in alignment therewith, said diffusion chamber being in communication with said inlet pipe, and said gathering chamber being in communication with said outlet pipe with said oil separating chamber between said gathering chamber and said diffusion chamber, and
• said diffusion chamber is divided into a plurality of sub-chambers defined by one or more porous plates, a lowermost sub-chamber of said diffusion chamber communicating with said inlet pipe, and the inner opening of said atmospheric passage communicating with an upper sub-chamber.

A system for blow-by gas return to the combustion chamber of an engine having an oil separator with an inlet communicated with an outlet through a diffusion chamber and a filter element, said inlet communicating with the crankcase by an inlet pipe, and said outlet communicating with the intake manifold of the engine by an outlet pipe, comprising:

• a breather disposed on the cylinder head cover of said crankcase by an internal engine passage, and an outlet communicating with an inlet end of said inlet pipe;
• said oil separator being fixed upon said intake manifold;
• said inlet pipe communicating with said breather and with said oil separator, and an outlet pipe which connects said oil separator to said intake manifold disposed in a space over said cylinder head and said intake manifold;
• and
• said diffusion chamber in said oil separator in communication with the atmosphere by an atmospheric passage, wherein said atmospheric passage is formed by a communicating pipe extending through the peripheral wall of said diffusion chamber of said oil separator.

A system for blow-by gas return to the combustion chamber of an engine having an oil separator with an inlet communicated with an outlet through a diffusion chamber and a filter element, said inlet communicating with the crankcase by an inlet pipe, and said outlet communicating with the intake manifold of the engine by an outlet pipe, comprising:

• a breather disposed on the cylinder head cover of said crankcase by an internal engine passage, and an outlet communicating with an inlet end of said inlet pipe;
• said oil separator being fixed upon said intake manifold;
• said inlet pipe communicating with said breather and with said oil separator, and an outlet pipe which connects said oil separator to said intake manifold disposed in a space over said cylinder head and said intake manifold;
• and
• said diffusion chamber in said oil separator in communication with the atmosphere by an atmospheric passage, wherein a dust cover is provided to cover said peripheral wall of said oil separator, and said atmospheric passage opens into the space between said dust cover and the casing of said oil separator.