Intake system for the combustion air of an internal combustion engine in a portable handheld work apparatus

An intake arrangement for the combustion air of an internal combustion engine including an internal combustion engine of a portable handheld work apparatus, the engine including a carburetor and the intake arrangement comprising:

• a filter housing defining an interior;
• an air filter mounted in said filter housing for filtering the combustion air supplied to said engine;
• said air filter being mounted in said filter housing so as to partition said interior into a contaminant space having an inlet opening and a clean space fluidly connected to said carburetor;
• a blower for moving a flow of said combustion air laden with dust toward said filter housing;
• a centrifugal-force separator for receiving said flow of combustion air and for dividing said flow into a central core flow having a low particle density of said dust and a tangential flow surrounding said core flow with said tangential flow having a particle density of said dust greater than said low particle density:
• said centrifugal-force separator having discharge means for conducting said tangential flow away from said centrifugal-force separator;
• said centrifugal-force separator having conducting means for conducting said central core flow into said inlet opening and said contaminant space;
• and,
• said blower being a cooling-air fan of said engine.

An intake arrangement for the combustion air of an internal combustion engine including an internal combustion engine of a portable handhold work apparatus, the engine including a carburetor and the intake arrangement comprising:

• a filter housing defining an interior;
• an air filter mounted in said filter housing for filtering the combustion air supplied to said engine;
• said air filter being mounted in said filter housing so as to partition said interior into a contaminant space having an inlet opening and a clean space fluidly connected to said carburetor;
• a blower for moving a flow of said combustion air laden with dust toward said filter housing:
• a centrifugal-force separator for receiving said flow of combustion air and for dividing said flow into a central core flow having a low particle density of said dust and a tangential flow surrounding said core flow with said tangential flow having a particle density of said dust greater than said low particle density;
• said centrifugal-force separator having discharge means for conducting said tangential flow away from said centrifugal-force separator;
• said centrifugal-force separator having conducting means for conducting said central core flow into said inlet opening and said contaminant space;
• and,
• said centrifugal-force separator being configured essentially as one piece with said filter housing.

An intake arrangement for the combustion air of an internal combustion engine including an internal combustion engine of a portable handheld work apparatus, the engine including a carburetor and the intake arrangement comprising:

• a filter housing defining an interior;
• an air filter mounted in said filter housing for filtering the combustion air supplied to said engine;
• said air filter being mounted in said filter housing so as to partition said interior into a contaminant space having an inlet opening and a clean space fluidly connected to said carburetor;
• a blower for moving a flow of said combustion air laden with dust toward said filter housing;
• a centrifugal-force separator for receiving said flow of combustion air and for dividing said flow into a central core flow having a low particle density of said dust and a tangential flow surrounding said core flow with said tangential flow haying a particle density of said dust greater than said low particle density;
• said centrifugal-force separator having discharge means for conducting said tangential flow away from said centrifugal-force separator;
• said centrifugal-force separator having conducting means for conducting said central core flow into said inlet opening and said contaminant space:
• said conducting means being a dip tube for conducting said core flow away from said centrifugal-force separator and toward said contaminant space of said filter housing;
• and,
• said filter housing including first and second housing parts and said dip tube being formed as one piece with said first housing part.

An intake arrangement for the combustion air of an internal combustion engine including an internal combustion engine of a portable handheld work apparatus, the engine including a carburetor and the intake arrangement comprising:

• a filter housing defining an interior;
• an air filter mounted in said filter housing for filtering the combustion air supplied to said engine;
• said air filter being mounted in said filter housing so as to partition said interior into a contaminant space having an inlet opening and a clean space fluidly connected to said carburetor;
• a blower for moving a flow of said combustion air laden with dust toward said filter housing;
• a centrifugal-force separator for receiving said flow of combustion air and for dividing said flow into a central core flow having a low particle density of said dust and a tangential flow surrounding said core flow with said tangential flow having a particle density of said dust greater than said low particle density;
• said centrifugal-force separator having discharge means for conducting said tangential flow away from said centrifugal-force separator;
• said centrifugal-force separator having conducting means for conducting said central core flow into said inlet opening and said contaminant space;
• said centrifugal-force separator being an axial cyclone;
• and,
• said blower being mounted for directing said flow of combustion air to said axial cyclone.