Air filter with scaling bead freely movable in the radial direct

Details Air filter with scaling bead freely movable in the radial direct Air filter with scaling bead freely movable in the radial direct

1995-12-18

1998-03-24

Smith, Duane S.

Gas separation

Combined or convertible

In motor vehicle

55482, 55498, 55502, 55510, 123198E, B01D 4624

Patent

active

057307695

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to filter, in particular for the intake air for internal combustion engines.
From the U.S. Pat. nO. 4,720,292 an air filter is known with the following features: a housing with an axial outlet opening and a substantially open second end which is closeable by a removable cover. At the periphery of the housing, an air inlet opening is arranged. In the housing, there is a substantially cylindrical filter element with an inner support tube, for a filter with an outer support tube, whereby the inner filter element is arranged coaxially in the housing. The sealing of the filter element to the housing is affected via an annular end plate, which has a substantially cylindrical, radially-inwardly directed surface, and which is pushed over an inner section of the outlet part.
As is well known, the filter inserts of air filters are exchanged after a predetermined operating time. Depending on the occurrence of dust, the operating time of an air filter can amount to from a few days (construction machines) up to several months. The filter insert known from the above-mentioned U.S. Pat., as well as other conventionally utilized filter inserts, consists of a combination of materials, whereby, in particular, sheet steel is utilized for the supporting tubes. The actual filter medium is paper or a fleece of synthetic fibers. The end plates are composed of synthetic plastic (soft elastomer). A disposal of such an air filter or a separation into the individual component materials is very costly and, therefore, up to this time, has been uneconomical.
In accordance with the controlling "Technical Regulations on Waste" in the Federal Republic of Germany, the principle of avoiding generation of waste takes precedence over the recovery or recycling of waste and over the disposal of waste. Preconditions for waste reprocessing procedures are that the reprocessing be technically feasible, the costs of the reprocessing be attainable, and that a market exist or can be created for the recovered material or energy. Only when these criteria are not fulfilled is the waste to be disposed of in accordance with the regulations.
Up to this time, the reprocessing of air filter inserts has not been feasible due to the above-described disadvantages.
A further disadvantage of the known state of the art is to be seen in that a relatively large housing is required for the air filter inserts which takes up an unnecessarily large amount of space in the clean air region.


SUMMARY OF THE INVENTION

The invention, therefore, is based on the object of providing a filter whose filter insert in a metal-free embodiment can be disposed of without any difficulty and which is as compact as possible in construction.
The invention has the advantage compared to the previously known state of the art that the filter parts, which are not subjected to wear or to consumption, are fixedly arranged on the housing, and thus only those parts are exchanged which are subject to consumption.
This means that it is only necessary to exchange the filter means, i.e. the paper or the fleece with the two end plates, while the synthetic plastic center tube, or other elements similar to synthetic plastic supporting tubes, valves or the like, remain in the filter housing.
A further advantage of the invention lies in the fact that by arranging the radial seal outside of the filter region, a substantial reduction of the size of the filter construction is achieved. It is further advantageous in the invention that the radial seal is not enclosed in the radial direction by the filter insert or other limiting means, but instead is freely moveable and thereby achieves a higher elasticity and consequently also a higher reliability, particularly in the case of oscillations or vibrations.
In accordance with one embodiment of the invention, the filter insert is supported with a closed end face on the cover of the housing. This supporting takes place via protuberances which lie adjacent the inner wall. In this way, a force-keyed connection is ach

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