Intake arrangement

A technology of air intake device and air intake channel, which is applied in the direction of fuel air intake, charging system, combustion air/combustion-air treatment, etc. Deterioration of engine exhaust emissions, etc.
CN1661214AActive Publication Date: 2005-08-31ANDREAS STIHL AG & CO KG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANDREAS STIHL AG & CO KG
Publication Date
2005-08-31

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Abstract

An intake arrangement ( 1 ) for a two-stroke engine includes an intake channel ( 2 ) in which a throttle flap ( 3 ) is pivotally journalled with a throttle shaft ( 4 ). Downstream of the throttle flap ( 3 ), a partition wall ( 8 ) is mounted on the intake channel ( 2 ) and this partition wall partitions the intake channel ( 2 ) into an air channel ( 6 ) and a mixture channel ( 7 ). In the idle position ( 5 ) of the throttle flap ( 3 ), at least one fuel opening ( 14 ) opens into the mixture channel ( 7 ) downstream of the throttle flap ( 3 ). A connecting opening ( 16 ) between the air channel ( 6 ) and the mixture channel ( 7 ) is provided between the partition wall ( 8 ) and the throttle shaft ( 4 ) in the idle position ( 5 ) of the throttle flap ( 3 ). A shield ( 20, 30 ) is mounted in the mixture channel ( 7 ) between the fuel opening ( 14 ) and the connecting opening ( 16 ) in order to achieve a good swing performance of the two-stroke engine. The shield reduces the passing of fuel into the air channel and therefore the degree of wetting of the air channel with fuel.
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Description

technical field

[0001] The present invention relates to an air intake device for a two-stroke engine, in particular for a hand-held tool, such as a chainsaw, a free cutter or a tool of the same type as specified in the preceding part of claim 1. device. Background technique

[0002] An intake system for a two-stroke engine is known from DE 101 60 539 A1, the intake duct of which is divided by a partition wall downstream of the throttle valve into an air duct and a mixture duct. In the range of the throttle valve, there is a hole in the partition wall, which is closed when the throttle valve is at the full load position; when the throttle valve is at the idle position, the fuel can pass through the connection hole from the mixed air channel to the air channel, so that the air channel The walls are also wetted with fuel at idle. When the air intake device swings, especially when the hand-held tool swings, the fuel attached to the wall of the air intake will suddenly fall off...

Claims

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