Patent · US Expired

Air filter for internal combustion engines

US5400753A · kind A · utility

16Cited by

4References

11Claims

0Family size

Assignee

Filterwerk Mann & Hummel GmbH · DE

Inventors

Heinz Andress · Erdmannhausen, DE
Heinz Mueller · Monheim, DE
Mario Rieger · Freiberg, DE

Key dates

Filing date	May 11, 1994
Grant date	Mar 28, 1995
Priority date	—
Expiry date	May 11, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S55/28
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.