Intake arrangement for the combustion air of an internal combustion engine
AssigneeAndreas Stihl AG & Co. KG
InventorHeinz Hettmann
Life of this patent
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Abstract
The invention relates to an intake arrangement for the combustion air (2) of an internal combustion engine (3) in a portable handheld work apparatus such as a cutoff machine, a motor-driven chain saw or the like. Combustion air is supplied to an air filter (6) via a first centrifugal-force separator (4). The air filter (6) is charged with a carrier airflow (8) in addition to combustion air and the carrier flow (8) contains coarser particles (9) which function to build up a filter cake (26) on the air filter (6). In this way, a low maintenance continuous operation of the intake arrangement is made possible especially when the ambient air is heavily laden with dust.
Claims16
An intake arrangement for combustion air of an internal combustion engine including an internal combustion engine of a portable handheld work apparatus, the combustion air drawn toward said engine being laden with dust, the intake arrangement comprising:
- an air filter mounted upstream of said engine for separating said dust from said combustion air;
- a centrifugal-force separator for receiving a flow of combustion air and for dividing said flow into a central core flow having essentially fine particles of said dust and a tangential flow surrounding said central core flow;
- said air filter being connected to said centrifugal-force separator so as to cause said central core flow to flow to said air filter;
- and,
- supply means for supplying a carrier airflow containing coarse particles of said dust to said air filter to permit said coarse particles to build up a filter cake on said air filter to separate out said fine particles in said central core flow.
An intake arrangement for combustion air of an internal combustion engine including an internal combustion engine of a portable handheld work apparatus, the combustion air drawn toward said engine being laden with dust, the intake arrangement comprising:
- an air filter mounted upstream of said engine for separating said dust from said combustion air;
- a group of three centrifugal-force separators including a left-hand centrifugal-force separator, a middle centrifugal-force separator and a right-hand centrifugal-force separator with each of said centrifugal-force separators receiving a flow of air;
- each of said centrifugal-force separators dividing its flow of air into a central core flow having essentially fine particles of said dust and a tangential flow surrounding said central core flow having essentially coarse particles;
- and,
- said centrifugal-force separators being so fluidly connected to each other that the central core flows of said left-hand and right-hand centrifugal-force separators and the tangential flow of said middle centrifugal-force separator are all directed to said air filter.
Dependencies are inferred from the claim text.