Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass
Patent
1997-02-11
1998-09-29
Savage, Matthew O.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid pressure responsive by-pass
210132, 210248, 210428, 210429, 210440, 210442, 210457, B01D 3534
Patent
active
058142150
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a lubricating-oil filter for internal combustion engines, in particular, in accordance with the features of the precharacterizing clause of Patent Claim 1.
An oil filter of this kind is known from EP 06 12 549 A2.
DE 41 31 353 A1 has disclosed an oil filter with a full-flow filter insert and a partial-flow filter insert, in which the two inserts are mounted detachably on a support mounted rotatably in the screw cover of this filter. In this filter, the support does not interact with an additional outlet port in such a way that the said port is closed with the cover closed and open with the cover open. Moreover, one of the two filter inserts, which is there composed, in particular, of folded filter-web material, is supported in an insufficiently firm manner radially at the inside over its entire length.
Taking this as a starting point, the invention is concerned with the problem of simplifying the structure of a filter derived from the generic type defined in the first-mentioned publication EP 06 12 549 A2, to improve its operation and, in addition, to ensure that the filter insert is well supported radially at the inside. The provision of good support of the filter insert radially at the inside is intended to improve its life, which is determined by strength.
A fundamental solution to this problem is achieved by means of an embodiment of the lubricating-oil filter of the relevant generic type in accordance with the characterizing features of Patent Claim 1.
The invention is based on the idea of supporting the annular filter insert solely on the support and, at the same time, of designing the support extending from the screw cover to the bottom of the filter-housing cup as a permeable tube in the region of the filter insert between its ends, the design being such that this tube can be used as a supporting core for the internal radial support of the annular filter insert.
Expedient configurations of the invention are the subject-matter of the subclaims and are explained in greater detail with reference to various exemplary embodiments.
Exemplary embodiments of the invention are illustrated in the drawing.
All the figures show an essentially schematic representation of a filter housing in longitudinal section. The difference between the individual embodiments consists essentially only in the various ways in which the support is divided in the longitudinal direction.
The following divisions are shown in the individual figures.
FIG. 1: the support comprises a bottom part, extending over almost the entire length, and a snapped-on cap,
FIG. 2: the support is divided into three parts latched together,
FIG. 3: the support comprises a top part with a cap and a bottom part latched to the said top part,
FIG. 4: the support comprises three individual parts latched together,
FIG. 5: the support is divided into two with a division somewhat above the centre of the filter insert,
FIG. 6: the support is made up of a top part and a bottom part, which are latched to one another at the level of the lower end of the filter insert, the upper end of the support surrounding an annular filter screen.
The filter housing comprises a filter-housing cup 1 which is open at the top and can be closed by means of a screw cover 2. In the region of the bottom, the filter-housing cup 1 is drawn in in the manner of a bottleneck.
A support 3 is mounted rotatably in the screw cover 2 by way of a latch-type fastening and accommodates an annular filter insert 4. In the region in which it is surrounded by the filter insert 4, between the ends of the latter, the support 3 is designed as a radially permeable supporting tube 5 against which the annular filter rests radially from the inside. At the top, at the end facing the screw cover 2, the supporting tube 5 is closed axially in a leak-tight manner by a cap 6. In the region of the lower end of the annular filter insert 4, the supporting tube 5 is of radially impermeable design. At its upper end, the annular filter insert 4 rests in a radially leak-tight manner against the ca
REFERENCES:
patent: 5516425 (1996-05-01), Brieden et al.
patent: 5589060 (1996-12-01), Gebert et al.
Bruss Elke
Jensen Hans
Mohle Rolf
Knecht Filterwerke GmbH
Savage Matthew O.
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