Pumps – Motor driven – Electric or magnetic motor
Patent
1995-10-26
1997-03-04
Gluck, Richard E.
Pumps
Motor driven
Electric or magnetic motor
310233, F02M 3708
Patent
active
056072937
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a unit for conveying fuel from a supply tank to an internal combustion engine according to the generic part of claim 1.
A unit of this type is known from U.S. Pat. No. 3,873,243. This unit has a feed pump and an electric motor for driving a feed element of the feed pump. The electric motor has a rotor with an armature and a plan commutator arranged at one end. The armature and the plan commutator are partially encased by injection molded plastic. The plan commutator is formed by a plurality of segments which are connected with the armature so as to be electrically conductive and are separated from one another by slots extending along the longitudinal axis of the rotor. The sheathing or casing extends only so far in the direction of the longitudinal axis of the rotor that the slots between the segments of the plan commutator are not covered by it. If the slots were also covered by the casing it is possible that molten plastic could penetrate into the slots during fabrication of the casing thus jeopardizing the reliable operation of the rotor. The casing is required in order to minimize power losses of the electric motor brought about by the rotating movement of the armature and/or to protect the armature against electrochemical corrosion which would occur, for example, by operating the unit in alcohol.
The connection wires for connecting the plan commutator with the armature are conventionally arranged at the outer surface of the segments. In the interest of achieving the shortest possible construction of the unit, the plan commutator is constructed so as to be short enough in the direction of its longitudinal axis that the connection points of the connection wires extend closer to the end face of the plan commutator than the slot base. In the construction of the casing described above, the connection points of the connection wires at the segments of the plan commutator would not be covered by the casing and would therefore not be protected, so that electrochemical corrosion could occur and result in their destruction.
ADVANTAGES OF THE INVENTION
The unit according to the invention has the advantage over the prior art that the connection points of the connection wires at the segments of the plan commutator are also enclosed by the casing and are accordingly protected so as to ensure that no liquid plastic can penetrate into the slots during the fabrication of the casing. The casing can advantageously be produced in an injection molding die which is divided in a longitudinal center plane of the rotor. In this way the rotor can be removed from the die in a simple manner and the casing for a plurality of rotors can be manufactured in the injection molding die simultaneously.
Advantageous constructions and further developments of the invention are indicated in the dependent claims.
DRAWING
An embodiment example of the invention is shown in the drawing and described in more detail in the following description. FIG. 1 shows a unit for feeding fuel from a supply tank to the internal combustion engine in partial longitudinal section; FIG. 2 is an enlarged view of a rotor of the unit shown in FIG. 1; FIG. 3 shows a plan view of the rotor considered in the direction of arrow III in FIG. 2.
DESCRIPTION OF THE EMBODIMENT EXAMPLE
FIG. 1 shows a unit 10 for feeding fuel from a supply tank 12 to the internal combustion engine 14 of a motor vehicle. For example, the unit 10 can be arranged in the supply tank 12. The unit 10 has a feed pump 16 and an electric motor 18 for driving the feed pump 16. The feed pump 16 and the electric motor 18 are arranged adjacent to one another in a housing 20. The feed pump 16 has a feed element 22 which can be constructed, for example, as an impeller which is provided with vanes along its circumference and rotates in a pump chamber 24. The electric motor 18 has a rotor 26 with a shaft 27 by which it is supported so as to be rotatable about its longitudinal axis 28 and with which the feed element 22 of the feed pump 16 is connected in the rotating direct
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patent: 3457867 (1969-07-01), Komon
patent: 3873243 (1975-03-01), Nusser et al.
patent: 4433263 (1984-02-01), Longhouse et al.
patent: 4580334 (1986-04-01), McCracken et al.
patent: 5338992 (1994-08-01), Tsai
Gluck Richard E.
Robert & Bosch GmbH
Striker Michael J.
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