DE29516654U1 - Universal cover for a liquid filter with two sealing zones - Google Patents

Description

Company Ing. Walter Hengst GmbH & Co. KG ₁ Nienkamp 75, 48147 Münster

"Universal lid with two sealing zones for a Liquid filter"

The innovation relates to a lid according to the preamble of claim 1.

Such covers are used, for example, for oil filters for

Motor vehicles. The pot-shaped housing is usually made of metal and is manufactured, for example, by die casting. Sealing between the cover and the filter is usually achieved by means of a sealing ring, which is held in an annular groove in the cover and to which a sealing

surface on the pot-shaped housing, whereby the sealing effect is achieved when the cover is completely screwed onto the housing. The seal is provided in the area of the component-side end of the cover thread, i.e. either directly adjacent to the thread or in the

Cover surface is displaced at a small distance from the component-side end of the cover thread. The corresponding sealing surface on the pot-shaped housing is accordingly located in the area of the free end of the housing thread.

For cost and weight reasons, it is common to make the cover of the liquid filter out of plastic. Although especially when used as an oil filter, considerable pressures and temperatures occur in the area of the filter, which could adversely affect the dimensional stability of the cover,

These influences are so minor that the desired sealing effect of the lid is not impaired.

For the reasons mentioned above, it may be advantageous to also manufacture the housing of the liquid filter from plastic or

the housing and/or the cover of the filter from other

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materials, &zgr;. &Bgr;. materials based on renewable raw materials, whereby such materials, like plastic, have a limited rigidity compared to metal and may have limited dimensional stability under the pressure and temperature conditions prevailing in filter operation

exhibit.

However, this creates the problem that, given the temperatures and pressures of the medium to be filtered and the above-mentioned adverse influences on

the material from which the filter housing would then be made, the rigidity and dimensional stability of the filter housing can no longer be guaranteed to a degree that ensures a tight connection between the housing and the cover.

This could cause liquid to be filtered to penetrate into the threaded gap between the housing and the cover of the filter and cause a deformation - for example an expansion - of the filter housing in the threaded area, so that the

desired tightness between the housing and the cover would no longer be guaranteed.

The use of special covers that would be adapted to the plastic housings and ensure the tightness of the filter

represents an undesirable additional expense in terms of supplying spare parts.

The innovation is based on the task of improving a generic liquid filter so that the

The cover can be used on either plastic or metal housings and in each case a sufficient sealing effect can be guaranteed.

This problem underlying the innovation is solved by the design of a liquid filter according to the features of claim 1.

In other words, the innovation proposes to install the

to allow the previously used position of the seal to remain unchanged, so that the cover can be used in the conventional way with metal filter housings. In addition, however, the possibility should be created of using a seal in the area of the free end of the cover, where

for example, by a groove into which a sealing ring can be inserted. In this way, the same cover can be used for a filter housing made of plastic, in which a sealing effect between the free end of the cover thread and the component-side end of the housing thread is

to prevent the medium to be filtered from penetrating the thread and thus preventing undesirable expansion of the filter housing.

The advantage of the proposed cover is that it

can be used for both filter housings, so no special attention or additional stocks are required with regard to spare parts supply, but can be used either for one or the other filter housing.

If seals are permanently attached to the lid, for example molded-on elastic sealing lips, both seals can be permanently attached to the lid. When using sealing rings, depending on the design of the seal,

wind - either both sealing zones of the cover must be designed in the same way, for example in the form of ring grooves with the same diameter and cross-section, or an expandable seal can be used if the ring grooves have different diameters, so that the cover, which is in the car

mobilwerk is installed or is traded as a spare part,

a loosely packed sealing ring can be assigned, which can be arranged by the user as required either in the area of the free end or in the area of the component-side end of the cover thread.
5

The arrangement of the sealing ring on the cover has the advantage over an arrangement on the housing that the seal is easier to install and, in addition, when the cover is replaced, a new seal is automatically used, so that the sealing quality when replacing the cover of the

liquid filter is ensured.

The arrangement of the seal "in the area" of the free end or the component-side end of the cover thread or the housing thread means that the seal is within the

thread area, i.e. between the free end and the component-side end, or can be directly adjacent to the free or component-side end or can be arranged at a distance from the free or component-side end of the thread.

An embodiment of the innovation is explained in more detail below using the drawing, in which the two different arrangements of the seal are shown for comparison with otherwise identical components.

In this case, 1 generally designates a cover for a liquid filter, whereby the cover comprises a cover surface 2 and a circumferential collar 3, which serves as a stop when screwing the cover 1 onto the housing of the filter.

Furthermore, the cover 1 comprises a thread 4 with a free end 5 and an end 6 on the component side, i.e. directed towards the cover surface 2.

Both in the area of the free end 5 and the component

Sealing zones 7 and 8 are provided on the side end 6, which

each designed as a circumferential annular groove and in which a sealing ring 9 can be arranged.

When using the cover 1 in conjunction with a conventional metal filter housing, the sealing ring 9 is inserted into the upper sealing zone 8, i.e. in the area of the component-side end 6 of the cover thread 4. Hot oil, which penetrates into the thread between the cover 1 and the metal filter housing and reaches the sealing ring 9, does not lead to a yielding of the filter housing and to

a leak.

When using the cover 1 in conjunction with a filter housing made of plastic, the sealing ring 9 can preferably be placed in the lower sealing zone 7, i.e. in the area of the

free end 5 of the thread 4 in order to prevent the penetration of the possibly hot and pressurized medium to be filtered into the space between the cover-side and housing-side threads.

In practice, the arrangement of a single seal, e.g. a sealing ring 9, is usually sufficient for the desired sealing effect; however, deviating from the arrangement shown, both sealing zones 7 and 8 can also have seals.

Thus, in contrast to the embodiment shown, instead of the loosely insertable sealing ring 9, a molded sealing lip made of a material softer than the cover material can be provided, in which case both in the

Such a sealing lip is present in the area of the free end 5 as well as in the area of the component-side end 6 of the seal 4, in order to be able to use the cover either in conjunction with a metallic filter housing or a plastic filter housing.

Claims (2)

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20 "Universal lid for a liquid filter with two sealing zones" Protection claims:
25 1. Lid for a liquid filter, wherein the liquid filter comprises a housing and the cover can be removably screwed to the housing, where the two corresponding threads the housing and the cover each have a free end and a component-side end, and wherein a seal is arranged between the housing and the cover, and wherein on the housing and on the cover Sealing zones are provided where the sealing effect effect is achieved with the cover screwed to the housing, characterized , that two sealing zones (7,8) are provided on the cover (1), of which one sealing zone (7) is in the area of the free end (5) and the other sealing zone (8) is arranged in the area of the component-side end (6) of the thread (4). 2. Lid according to claim 1, characterized in that the sealing zones (7,8) are designed as grooves for receiving a sealing ring (9).