Internal-combustion engines – Charge forming device – With fuel pump
Patent
1996-10-28
1998-08-25
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
With fuel pump
181202, F02M 3304
Patent
active
057973768
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for receiving a fuel delivery unit inside a fuel tank.
Up to now, for the muffled installation of a fuel delivery unit inside a fuel tank, the unit was placed in a damping element, made of rubber or a fuel-resistant plastic material, which was fixed in place in a suitable manner in the tank. However, these damping elements, which are made of rubber and immersed in the fuel, harden. Alternative materials, such as plastic, swell up greatly in fuel. With both options it was therefore possible for noise-conducting bridges to be created over time.
A delivery unit holder is known from DE-PS 39 12 773, in which damping elements made of flow, net, grid or cell structures, which maintain their elasticity, are provided. The elasticity of these damping elements is therefore not determined by the elastomeric properties of the material, but in that this material has been given a suitable, elastically yielding structure. The fuel delivery unit is connected with the damping element by means of hose clamps which in turn are connected with the fuel tank. An installation of a fuel delivery unit of this type has a multitude of mechanical connections and elaborate connecting techniques for receiving and fixing the fuel delivery unit in place in the fuel tank.
SUMMARY OF THE INVENTION
The device in accordance with the invention has a simple and cost-effective arrangement for the installation of a fuel delivery unit in a fuel tank. This arrangement essentially consists of a damping element, which essentially completely encloses the fuel delivery unit, and of a holding device, by means of which the damping element can be arranged in the fuel tank. It is possible by means of this to achieve a considerable reduction of the elements required for installation, as well as of the costs for mounting and checking. Furthermore, the risks connected with the elaborate connecting systems known from the prior art can be omitted.
Furthermore, because of the damping element, which essentially completely encloses the fuel delivery unit, an almost complete uncoupling of the fuel delivery unit from the holding device and therefore from the fuel tank can be provided, without further mechanical connections on the fuel delivery unit and the holding device being required. By means of this it is possible to achieve a high degree of vibration insulation, which leads to a low-noise housing.
In an advantageous embodiment of the device the damping element is embodied as a foam body which interlockingly surrounds at least the fuel delivery unit. A secure reception and defined position of the fuel delivery unit in the damping element is provided by means of this. The foam body can be designed to be open on one side, so that the fuel delivery unit can be inserted into it, and it can be closed by the holding device, wherein the holding device can be attached in an interlocking and/or frictionally connected manner to the open side of the foam body.
A further advantageous embodiment of the damping element lies in the use of an open-celled foam body. By means of this it is possible to create a suitable, elastically yielding structure, wherein noise elimination remains unchanged over extended periods of time. Alternately it can also be provided that damping elements, which are made of closed-celled or mixed cell material, are usefully employed. It can furthermore be provided that the foam body has, at least partially, a grid structure of metal fibers or thin metal wires, which can reinforce the foam body at least partially.
In accordance with a further advantageous embodiment of the device it has been provided that the damping elements are made as two- or multi-piece elements. By means of this it is possible to develop pre-formed or already foamed half shells or shaped elements, which can be combined in a simple manner into a damping element during assembly.
These damping elements, which are advantageously embodied as two- or multi-piece elements, can have a parting plane extending either radially
REFERENCES:
patent: 4728266 (1988-03-01), Matsumoto et al.
patent: 5151018 (1992-09-01), Clendenin et al.
patent: 5272285 (1993-12-01), Miller
patent: 5392750 (1995-02-01), Laue et al.
patent: 5407330 (1995-04-01), Rimington et al.
Frank Kurt
Wuerl Wolfgang
Moulis Thomas N.
Robert & Bosch GmbH
Striker Michael J.
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