Filter with safety element for filtering engine oil

Details Filter with safety element for filtering engine oil Filter with safety element for filtering engine oil

1999-06-15

2001-01-23

Savage, Matthew O. (Department: 1723)

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

C210S091000, C210S130000, C210S133000, C210S232000, C210S444000

Reexamination Certificate

active

06177003

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a filter, in particular for filtering the lubricating oil in an internal combustion engine.
An oil filter for the cleaning of lubricating oil in the internal combustion engines of motor vehicles is known from the European patent document 03 14 915. This is comprised of a filter housing that is at least approximately upright with a cover which can be screwed onto it; further it includes an annular oil filter cartridge inserted in the filter housing, to which the contaminated oil is conveyed. On the bottomfloor of the oil filter housing, there is a bottom discharge valve which opens up a dischargechannel when the cover is opened and the oil filter cartridge is removed. The valve comprises two springs and a valve plate and is constructed in such a way that even with the oil filter cartridge missing, it closes anyway because of the increasing oil pressure, so that a supply of oil to the motor is also assured when no filter cartridge is inserted.
One disadvantage is, however, that when the filter insert is missing, the unfiltered oil reaches the areas to be lubricated and results in damage to the bearings. The motor can be used without an oil filter cartridge for a short time in emergency operation, however it will not be apparent that no oil filter cartridge is present.
SUMMARY OF THE INVENTION
Therefore, the object of the invention is to provide a filter, in particular for filtering the lubricating oil in an internal combustion engine, which indicates that a filter insert is missing or prevents operation of the motor when the filter insert is missing.
This object is achieved by a filter as described hereinafter.
One advantage of the invention lies in the fact that due to a safety element, when the filter element is missing, it becomes impossible to close the housing with the cover.
In accordance with an alternative embodiment of the invention, a particularly simple and reliable valve construction is shown. The valve serves as a bypass valve between the unfiltered oil side and the filtered oil side and is made of few components, that is, only a valve body, a spring and a valve plate. Such valves are preferably produced of thermoplastic synthetic resin material. However, the spring is, of course, a metal spring. The valve plate is a synthetic resin ring which is pulled over the pressure spring and the valve body and is welded, for example, by an ultrasonic sealing process to a supporting body which is likewise made of thermoplastic synthetic resin material. This has the advantage that, in addition to the low number of components, a low leakage is achieved due to the extreme roundness of the conical nipple compared to other valve construction principles. Of course, it is also possible to interlock, snap or glue the valve plate to the supporting body.
According to one embodiment of the invention, the safety element can be a tipping element or a rocker, which prevents the cover from being screwed onto the housing by means of a blocking effect. When the filter insert is missing, the tipping element blocks the cover from being put on due to the force of gravity or a spring.
In a further embodiment of the invention it is envisioned that a pressure relief valve or a bypass valve is provided between the unfiltered oil side and the filtered oil side, wherein it is also possible to monitor the functioning of the valve with a tappet which indicates when the valve is open.
The filter element is recyclable and is made of a filter material folded in zig-zag fashion, which is provided on each end face with a casting material. This castable material is, for example, nitrile rubber and produces a separation of the unfiltered liquid area from the filtered liquid area in the manner of a radial seal.
These and other characteristics of preferred refinements of the invention are based not only on the claims, but also on the specification and the drawings, where each of the individual characteristics can be realized either alone or together as sub-combinations in the embodiment of the invention and in other fields and can represent embodiments that are advantageous as well as being patentable themselves, for which protection is claimed here.


REFERENCES:
patent: 3405804 (1968-10-01), Rosaen
patent: 3507391 (1970-04-01), Rosaen
patent: 3591003 (1971-07-01), Cooper
patent: 4215232 (1993-11-01), None
patent: 9411212 (1994-10-01), None
patent: WO9217262 (1992-10-01), None

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