Internal-combustion engines – Charge forming device – Fuel flow regulation between the pump and the charge-forming...
Patent
1996-10-28
1998-08-18
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel flow regulation between the pump and the charge-forming...
123463, F02M 3704
Patent
active
057945977
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to a device for supplying an internal combustion engine with fuel from a supply tank in accordance with the species of claim 1.
Such a device is known from DE 44 02 224 A1. This device has a feed pump disposed in the supply tank, which can be inserted through an opening in the supply tank. The opening in the supply tank can be closed by means of a closure element, on which a pressure regulator is arranged. The pressure regulator has a pressure chamber, which has a connection with the pressure side of the feed pump, with the internal combustion engine and with a relief line. In this case the closure element has a flange-like base body made of plastic, which closes the opening. A depression has been made in the base body, into which a connector projects, which is made of one piece with the base body and which constitutes the connection of the pressure chamber with the relief chamber. To form a pressure chamber, the depression in the base body is covered with an elastically deformable diaphragm, which directly acts together with the front end of the connector as a seat. The diaphragm is acted upon by a spring in the direction toward the connector, and when a defined pressure is exceeded, the diaphragm clears the connector for a connection between the pressure chamber and the relief chamber. The diaphragm is stretched between the base body and a separate retaining element fastened on the base body. It was noted that during opening and closing the connector, the diaphragm does not move exactly perpendicularly in respect to it, but instead rubs against it and thus is subject to wear, so that the diaphragm only has a limited durability and the function of the pressure regulator is not permanently assured.
ADVANTAGES OF THE INVENTION
In contrast to this, the device in accordance with the invention for supplying an internal combustion engine with fuel from a fuel tank, having the characteristics of claim 1, has the advantage that the diaphragm is not subject to wear, so that the pressure regulator has sufficient durability.
Advantageous embodiments and further developments of the invention are recited in the dependent claims. The manufacture and mounting of the closure element is further simplified by means of the one-piece design of the connectors in accordance with claim 5. A secure seating of the diaphragm and a simple mounting of all elements of the pressure regulator in one direction is made possible by the embodiment in accordance with claim 8.
DRAWINGS
Several exemplary embodiments of the invention are represented in the drawings and will be explained in detail in the following description.
Shown in FIG. 1 is a device for supplying an internal combustion engine with fuel from a fuel tank, in
FIG. 2, a closure element of the fuel tank in FIG. 1 in longitudinal section in an enlarged representation in accordance with a first embodiment,
FIG. 3, a pressure regulator of the closure element in FIG. 2 in an enlarged representation,
FIG. 4, a second exemplary embodiment of the closure element,
FIG. 5, a first variant of the fastening of a retaining element of the closure element in FIG. 4,
FIG. 6, a second variant of the fastening of the retaining element in the view in accordance with the direction of the arrow VI in FIG. 4,
FIG. 7, a third exemplary embodiment of the closure element, and
FIG. 8, the supply tank of the device with an additional injector pump.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
A device, represented in a simplified manner in FIG. 1, is used for supplying an internal combustion engine 10 with fuel from a supply tank 12. The device has a feed pump 14, which is disposed in the supply tank 12 and is held there in a manner not represented. The feed pump 14 can be designed in any arbitrary form and on its aspirating side aspirates fuel from a reservoir 16 in the supply tank 12. The supply tank 12 has an opening 20 in a wall 18, through which the feed pump 14 can be inserted. After the introduction of the feed pump 14, the opening 20 can be closed by means o
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Bueser Wolfgang
Frank Kurt
Schwegler Helmut
Seitz Ansgar
Talmon Uwe
Miller Carl S.
Robert & Bosch GmbH
Striker Michael J.
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