Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1998-08-06
2000-11-14
Wilson, Pamela
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
123514, F16K 3136
Patent
active
061455369
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a device for a fuel supply system for an internal combustion engine.
One such device is known from German Patent Disclosure DE 44 02 224 A1. This device has a feed pump, which is disposed in the supply tank and can be introduced through an opening in the supply tank. The opening in the supply container can be closed by means of a closure part on which a pressure regulator is disposed. The pressure regulator has a pressure chamber which has a communication with the pressure side of the feed pump, with the internal combustion engine, and with a relief line. The closure part has a plastic, flangelike basic body that closes the opening. An indentation is formed in the basic body, and a stub embodied integrally with the basic body and forming a communication of the pressure chamber with the relief chamber protrudes into this indentation. To form the pressure chamber, the indentation of the basic body is covered with an elastically deformable diaphragm that cooperates directly with the face end of the stub, as a seat. The diaphragm is urged by a spring toward the stub, and if a predetermined pressure in the pressure chamber is exceeded, the diaphragm releases the stub for communication of the pressure chamber with the relief chamber. The diaphragm is secured to the basic body. In the known device, the diaphragm is placed in the indentation, the spring is placed on it, and then the diaphragm together with a covering is braced against the basic body. Since in the known device the force of the spring acts on the diaphragm before the diaphragm is firmly fastened in place, it is possible to prevent with certainty that the diaphragm will shift to the side somewhat, thus allowing functional disturbances (such as pressure regulation errors, leaks, and so forth) to occur. If the device is installed in an engine compartment, then leaks can be very dangerous.
In an alternative embodiment of a device of DE 44 02 224 A1, it is provided that the retaining element has a flange on which free ends, bent outward, are formed. To secure the retaining element, the flange is disposed relative to a collar of the basic body, and as a result an outer edge of the diaphragm is fastened in place. The free ends of the flange engage the hook, disposed on the collar, from behind, and as a result the flange of the retaining element is disposed with tension toward the basic body, and the diaphragm is fastened in place. However, this embodiment has the disadvantage that the hooks of the recess must absorb the fastening force of the spring that acts on the diaphragm, so that the diaphragm will close the stub toward the pressure chamber. The attendant major retention forces cannot be absorbed sufficiently by the hooks, moreover, it is has been found chat after a relatively long period in service, material fatigue can occur, for instance from swelling of the plastic, and as a result the flange of the retaining element cannot be disposed with adequate initial tension relative to the recess of the basic body and the diaphragm cannot be fixed relative to the recess.
ADVANTAGES OF THE INVENTION
The device according to the invention for a fuel supply system, has an advantage over the prior art that simple, secure mounting of the diaphragm with regard to the basic body is accomplished with little effort or expense, and exact positioning of the diaphragm relative to the basic body can be attained. This enables a tight, durable connection with the basic body, and as a result the pressure chamber can be reliably partitioned off by the diaphragm. Because of the disposition of the spring ring on the basic body for fixing the diaphragm, it becomes possible for the clamping force of the prestressed spring ring, which is disposed relative to the basic body and retains the diaphragm, to be determined only by the initial tension of the spring ring. This arrangement also has the advantage that once the diaphragm has been positioned relative to the basic body, fastening of the diaphragm relative to the basic body is made possi
REFERENCES:
patent: 2286713 (1942-06-01), Burks
patent: 2318157 (1943-05-01), Heiser
patent: 4038506 (1977-07-01), Filip
patent: 5065725 (1991-11-01), Spoetter
Eiler Erich
Gerhard Albert
Rose Jochen
Strohl Willi
Greigg Edwin E.
Greigg Ronald E.
Rinehart Ken B.
Robert & Bosch GmbH
Wilson Pamela
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