Air filter for internal combustion engines
AssigneeFilterwerk Mann & Hummel GmbH
InventorsHeinz Andress, Heinz Mueller, Mario Rieger
Life of this patent
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Abstract
An air filter for an internal combustion engine which has a filter insert is arranged in a housing having a clean air outlet and an unfiltered air inlet provided with a screen. An auxiliary unfiltered air inlet is also provided which is closed by a flap under normal operating conditions but which opens under the influence of a negative pressure generated in the filter housing if the screen becomes clogged because of snow or ice entrained in the air stream, so that air can enter the filter through the auxiliary air inlet.
Claims11
An air filter for an internal combustion engine comprising a housing having an unfiltered air inlet provided with a screen and a clean air outlet, a filter insert arranged in the housing, wherein said housing has an auxiliary air inlet covered by a normally closed flap, and said flap opens only under the influence of a negative pressure produced in the filter housing to allow unfiltered air to enter the housing through said auxiliary air inlet.
Dependencies are inferred from the claim text.