Manually guided implement
AssigneeAndreas Stihl AG & Co. KG
InventorsMarkus Hüsges, Jochen Kramer
Life of this patent
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Abstract
A manually guided implement having an air-cooled internal combustion engine for driving a tool is provided. The engine is disposed in a housing, with cooling air being conveyed by a fan wheel that is fixedly held on the crankshaft of the engine and that is accommodated in a cooling air spiral case that is open toward the engine. Formed in the housing is an air inlet via which ambient air can be drawn into the cooling air spiral case. A base of the spiral case is disposed between the fan wheel and the engine and is provided with a second cooling air inlet that provides communication between the interior of the housing and portions of the cooling air spiral case that convey cooling air.
Claims14
A manually guided implement having an air-cooled internal combustion engine for driving a tool, said implement comprising:
- an implement housing in which said internal combustion engine is disposed, wherein said housing has a first air inlet;
- a cooling air spiral case disposed in said implement housing and open toward said internal combustion engine, wherein ambient air can be drawn into said cooling air spiral case via said first air inlet for conveyance to said internal combustion engine;
- and
- a fan wheel fixedly held on a crankshaft of said internal combustion engine and accommodated in said cooling air spiral case, wherein a second air inlet is formed as an aperture in a wall of said cooling air spiral case, in said housing, wherein said second air inlet provides communication between an intake chamber of said implement housing and portions of said cooling air spiral case that convey cooling air.
A manually guided implement having an air-cooled internal combustion engine for driving a tool, said implement comprising:
- an implement housing in which said internal combustion engine is disposed, wherein said housing has a first air inlet;
- a cooling air spiral case disposed in said implement housing and open toward said internal combustion engine, wherein ambient air can be drawn into said cooling air spiral case via said first air inlet for conveyance to said internal combustion engine;
- and
- a fan wheel fixedly held on a crankshaft of said internal combustion engine and accommodated in said cooling air spiral case, wherein a second air inlet is formed in a base of said cooling air spiral case that is disposed between said fan wheel and said internal combustion engine, wherein said second air inlet provides communication between an intake chamber of said implement housing and portions of said cooling air spiral case that convey cooling air, and wherein said fan wheel has two end faces, each of which is provided with a respective suction ring of vanes.
A manually guided implement having an air-cooled internal combustion engine for driving a tool, said implement comprising:
- an implement housing in which said internal combustion engine is disposed, wherein said housing has a first air inlet;
- a cooling air spiral case disposed in said implement housing and open toward said internal combustion engine, wherein ambient air can be drawn into said cooling air spiral case via said first air inlet for conveyance to said internal combustion engine;
- and
- a fan wheel fixedly held on a crankshaft of said internal combustion engine and accommodated in said cooling air spiral case, wherein a second air inlet is formed in a base of said cooling air spiral case that is disposed between said fan wheel and said internal combustion engine, wherein said second air inlet provides communication between an intake chamber of said implement housing and portions of said cooling air spiral case that convey cooling air wherein said intake chamber of said implement housing is disposed between a crankcase of said internal combustion engine and said housing, and wherein said intake chamber is in flow communication with at least one third inlet opening provided in said housing.
A manually guided implement having an air-cooled internal combustion engine for driving a tool, said implement comprising:
- an implement housing in which said internal combustion engine is disposed, wherein said housing has a first air inlet;
- a cooling air spiral case disposed in said implement housing and open toward said internal combustion engine, wherein ambient air can be drawn into said cooling air spiral case via said first air inlet for conveyance to said internal combustion engine;
- and
- a fan wheel fixedly held on a crankshaft of said internal combustion engine and accommodated in said coating air spiral case, wherein a second air inlet is formed in a base of said cooling air spiral case that is disposed between said fan wheel and said internal combustion engine, wherein said second air inlet provides communication between an intake chamber of said implement housing and portions of said cooling air spiral case that convey cooling air, and wherein a flow path within said implement housing to said second air inlet in said base of said cooling air spiral case is delimited in stages by a fuel tank of said internal combustion engine.
Dependencies are inferred from the claim text.