Fluid handling – Systems – With pump
Reexamination Certificate
2000-02-10
2001-04-17
Chambers, A. Michael (Department: 3753)
Fluid handling
Systems
With pump
C137S565010, C417S363000, C123S509000
Reexamination Certificate
active
06216734
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application relates to and incorporates herein by reference Japanese Patent Application No. 11-40509 filed on Feb. 18, 1999.
BACKGROUND OF THE INVENTION
The present invention relates to a structure for supporting a rotary device for a fuel supply apparatus.
A fuel pump for supplying an internal combustion engine with fuel is installed within a fuel tank of a vehicle or a sub tank accommodated within the fuel tank. The fuel pump comprises a mechanical pump unit and an electromagnetic drive unit (electric motor) for driving the pump unit. The fuel pump is supported in various ways within the sub tank or the fuel tank. For instance, it is supported in such a manner that its axis extends vertically, inclinedly or horizontally.
The electric motor generates vibrations during its rotation, and its first-order and higher-order components of the frequency of rotation cause vibrations of the sub tank or the side walls or bottom wall of a casing, thus generating noise sounds. Therefore, a rubber cushion member made of an oil-resistive rubber material is interposed between the outer peripheral surface of the fuel pump and the bottom wall of the casing. The rubber cushioning member must be rigid or high density-type to some extent to maintain its shape against the weight of the fuel pump and the reaction force of the same generated in response to the fuel discharge operation. As a result, the vibrations cannot be reduced sufficiently.
It is proposed to support the fuel pump from the side wall of the sub tank or the casing while interposing the rubber cushioning member between the outer peripheral surface of the fuel pump and the bottom wall. The side wall of the sub tank or the casing vibrates largely in a direction perpendicular to the side walls, because the vibration absorbing performance of the rubber cushioning member is limited due to its rigid or high density-type construction. Further, the assembling work for fixing the fuel pump to the side wall through the rubber cushioning member is complicated, because the rubber cushioning member must be fixed to both of the fuel pump and the side wall.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a rotary device support structure for a fuel supply apparatus using the same structure which provides an excellent vibration restriction performance is less assembling work and cost.
According to the present invention, a cushioning member disposed between a rotary device and a casing has a plurality of resilient parts. Each resilient part has a plate width in the axial direction of the rotary device and a wavy shape in cross section in the radial direction of the rotary device. Adjacent two of the resilient parts are connected with an engagement part. The cushioning member is resin-molded integrally with a part of a cover of the fuel pump. The rotary device is assembled with the casing in reduced assembling work by fitting the engagement parts with the casing from the top opening of the casing. The cushioning member resiliently supports the rotary device in the casing to absorb vibrations from the fuel pump, while withstanding the weight of the rotary device and the reaction force generated when the rotary device operates.
REFERENCES:
patent: 4362476 (1982-12-01), Kemmner et al.
patent: 4569637 (1986-02-01), Tuckey
patent: 4591319 (1986-05-01), Takahashi et al.
patent: 4768925 (1988-09-01), Geupel
patent: 4780063 (1988-10-01), Tuckey
patent: 5044526 (1991-09-01), Sasaki et al.
patent: 61-76117 (1986-05-01), None
Tanaka Masaaki
Umetsu Kunihiro
Chambers A. Michael
Denso Corporation
McShane Thomas L.
Nixon & Vanderhye P.C.
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