Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal for a pipe – conduit – or cable
Patent
1997-06-25
2000-06-06
Knight, Anthony
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal for a pipe, conduit, or cable
277616, 277637, 285379, 285917, F16J 1508
Patent
active
060708832
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a sealing unit for a fuel pressure sensor.
As a rule, sealing units of this kind constitute a fuel pressure sensor in combination with a sealing washer. Both parts are separate from each other. When the fuel pressure sensor is installed in a corresponding threaded bore of a fuel carrying component, the sealing washer is first inserted into the bore. A number of difficulties arise in connection with this. The threaded bores are often let into the fuel carrying component from the side or even from underneath so that the insertion of the sealing washer is difficult simply because of gravity. Also, sometimes the threaded bores are partially or completely impossible to see into because they are blocked from view by components disposed in front of them, so that the position of the sealing washer before the insertion of the fuel pressure sensor cannot be optically controlled without some means of assistance. Therefore an off-center or tilted seating of the sealing washer cannot be detected. Consequently, leaks or damage to the threaded bore or the fuel pressure sensor, which arise when the fuel pressure sensor is tightened, are not detected.
Also, in the case of a proper installation, problems can arise at least during disassembly of the fuel pressure sensor. The sealing washer is usually still seated at the bottom of the threaded bore after the fuel pressure sensor has been unscrewed. The washer sticks there, among other things, by means of adhesion with fuel residues or by means of being jammed in the thread runout. The subsequent removal is only possible through the expenditure of a considerable amount of time. At the same time, it includes the danger of mechanically damaging the bottom of the threaded bore, which serves as the sealing face, which can lead to leaks when the fuel carrying component is reused.
Furthermore, there is the possibility that the insertion of the sealing washer will be forgotten.
In order to avoid the disadvantages associated with the prior art described, a sealing unit must be produced, which assures a reliable sealing function and a simple installation and disassembly of the sealing washer.
ADVANTAGES OF THE INVENTION
With the sealing unit according to the invention, a pin is formed onto the threaded bolt-shaped end of the sensor housing, which pin centers the sealing washer, fixing it in a positive and/or frictional, non-positive manner, and rises above an end face that serves as a bearing surface for the sealing washer. The pin, which ends in an end face, has a length that is shorter than the thickness of the sealing washer.
Before the fuel pressure sensor is screwed into the fuel carrying component, the sealing washer is placed on the pin. When the pin has a cylindrical outer contour, the sealing washer is held on the pin, for example with the aid of a lateral press fit. The sealing washer can also be glued in the region of the pin. The sealing washer is axially compressed by means of the tightening of the fuel pressure sensor, by means of which a frictional, non-positive connection between the pin and the bore of the sealing washer is produced or at least reinforced.
Independent of the fixing method, the sealing washer is attached to the fuel pressure sensor so that during storage, transport, installation, and disassembly of the fuel pressure sensor, the sealing washer remains fixed to the fuel pressure sensor in captive fashion. Consequently, the sealing washer cannot be forgotten during installation, nor can it be inserted into the threaded bore of the component in an off-center manner. As a result, most of the causes for a leak in the sealing joint between the bottom of the threaded bore and the sealing washer are eliminated. Likewise, the fixing of the sealing washer on the pin virtually rules out the possibly of a leak in the sealing joint between the sealing washer and the pin or the flat bearing surface on the threaded bolt end. Furthermore, the flat bearing surface is covered and consequently protected by the sealing washer during s
REFERENCES:
patent: 1424094 (1922-06-01), Gunn et al.
patent: 4227420 (1980-10-01), Lamadrid
patent: 4543832 (1985-10-01), Van Over
patent: 4650227 (1987-03-01), Babuder et al.
patent: 5011196 (1991-04-01), Sabatier et al.
patent: 5313839 (1994-05-01), Ridenour
patent: 5992595 (1999-11-01), Adachi et al.
Greigg Edwin E.
Greigg Ronald E.
Knight Anthony
Peavey Enoch
Robert & Bosch GmbH
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