Pumps – Motor driven – Including means utilizing pump fluid for augmenting cooling,...
Reexamination Certificate
2000-01-26
2001-10-02
Walberg, Teresa (Department: 3742)
Pumps
Motor driven
Including means utilizing pump fluid for augmenting cooling,...
Reexamination Certificate
active
06296458
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to electric fuel pumps for internal combustion engines.
BACKGROUND AND PRIOR ART
Such electric fuel pumps have long been known, and are frequently provided with a mechanically commutated direct-current motor.
There are also known pumps which are driven by an electronically commutated direct-current motor, although they are used only for pumping cooling water and similar liquids and are referred to as “canned” pumps (German Patent Application DE 195 45 561 A1). The main purpose of the “can” is to seal the pump compartment from the outside.
In German Patent Application DE 42 22 394 A1 there is shown a pump-motor unit in which a cooling wall is provided between the pump mechanism and the drive motor and at the cooling wall there is disposed means for cooling at least one power part of a speed controller of the motor.
In German Patent Application DE 43 31 803 A1 there is shown an electronically commutated electric motor for the drive of a liquid feed pump, with means for holding the permanent magnets around the rotor. Therein, the current leads connected to the stator winding can be connected to an electronic commutation device, which is not mounted directly on the electric motor and is external to the electric pump.
There exists a need, however, for fuel pumps which can be driven by electronically commutated direct-current motors, and which overcome the problems presently preventing widespread use.
SUMMARY OF THE INVENTION
An object of the invention is to provide means by which an electric fuel pump having a motor with electronic commutation can be operated and manufactured without problems.
In accordance with the invention, an electric fuel pump for an internal combustion engine is provided which comprises a housing, a pump mechanism in said housing for pumping fluid from an inlet to an outlet of said housing and a d.c. motor, in said housing drivingly connected to said pump mechanism. The fuel flows through said housing from the inlet past the motor to said outlet. A module including a commutation circuit for said d.c. motor is connected to said motor and is sealed in said housing from the fuel flowing therethrough.
REFERENCES:
patent: 3600601 (1971-08-01), Ayres
patent: 5231967 (1993-08-01), Baltz et al.
patent: 5278468 (1994-01-01), Escaravage et al.
patent: 5345124 (1994-09-01), Lang
patent: 5421706 (1995-06-01), Martin, Sr.
patent: 5454697 (1995-10-01), Nakanishi
patent: 5697769 (1997-12-01), Kobman et al.
patent: 5785013 (1998-07-01), Sinn et al.
patent: 5908286 (1999-06-01), Clemmons
patent: 5960775 (1999-10-01), Tuckey
patent: 5997262 (1999-12-01), Finkbeiner et al.
patent: 6106240 (2000-08-01), Fischer et al.
patent: 6135730 (2000-10-01), Yoshioka
patent: 3423316 (1986-01-01), None
patent: 4222394 (1993-12-01), None
patent: 4309382 (1994-09-01), None
patent: 4331803 (1995-03-01), None
patent: 19545561 (1997-06-01), None
Rathke Ronald
Zacher Wolfgang
Ladas & Parry
Patel Vinod D
Pierburg AG
Walberg Teresa
LandOfFree
Electric fuel pump does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric fuel pump, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric fuel pump will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2616904