Pumps – Motor driven – Pump within rotary working member
Patent
1999-01-07
2000-11-21
Freay, Charles G.
Pumps
Motor driven
Pump within rotary working member
4174237, 415 551, 416 3, F04B 1700
Patent
active
061494046
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a feed unit for fuel.
In a known feed unit of this type, for feeding fuel from a fuel tank to an internal combustion engine of a motor vehicle (International Patent Disclosure WO 95/25885), the feed pump and the electric motor for driving it are disposed side by side in a housing. The pump wheel or impeller, which is occupied by fins or impeller vanes on its circumference, is seated on the shaft of the rotor in a manner fixed against relative rotation; the rotor has a rotor or armature winding, seated in slots, and it revolves in a stator that is occupied by permanent magnet segments. The delivery of current to the armature winding is effected via a commutator or current inverter seated on the rotor shaft and two current brushes resting radially under spring pressure on the commutator.
SUMMARY OF THE INVENTION
The feed unit for fuel according to the invention, has the advantage that by combining the rotating parts of the feed unit, that is, the impeller of the feed pump and the rotor of the electric motor, into a single part, a very simple and compact design is attained, which can be made at little production effort or expense. In particular, the feed unit can be very flat, that is, can have an extremely slight axial dimension. The resultant increasing outer diameter of the feed unit, in conjunction with the usual embodiment of the feed unit, is not only no disadvantage but in fact presents the capability of making additional provisions to improve the efficiency of the feed unit. Dispensing with the commutator and current brushes means that brush wear is not a factor, and the service life of the feed unit is increased. If the electric motor is embodied as a direct current motor, the requisite commutation of the current in the stator winding is done electronically.
In a preferred embodiment of the invention, the cylindrical pump chamber is bounded by two radially extending, axially spaced-apart side walls and a peripheral wall joining the side walls to one another along their circular periphery. The impeller faces each of the side walls with a gap spacing. An internal surface of the stator, formed by a slotted lamination packet forms the peripheral wall of the pump chamber. The impeller has a plurality of circumferentially spaced-apart radial impeller vanes, which between them define axially open vane chambers and which are joined together by an outer ring. The permanent magnets are secured on the outer ring, and if the feed unit is made of plastic are preferably manufactured from plastoferrites.
In an advantageous embodiment of the invention, in each side wall of the outflow conduit, one slotlike side channel, open toward the pump chamber, is embodied concentrically to the impeller axis, with an interruptor rib remaining between the end of the side channel and the beginning of the side channel, with respect to the flow direction. That the beginning of at least one side channel communicates with an intake opening, and the end of the side channel communicates with a pressure outlet; the axes of the inflow and outflow conduits from the intake opening and toward the pressure outlet are oriented either axially or preferably radially. Because of the especially advantageous radial inflow and outflow of fuel into and out of the pump chamber, a substantial reduction in flow losses is achieved, thus improving pump efficiency. The radial oncoming flow and outflow is possible without problems, in contrast to conventional side channel pumps, because of the increased outer diameter of the feed unit resulting from the mode of construction according to the invention, since as a result there is sufficient installation space in the radial direction to accommodate appropriate inflow and outflow conduits.
BRIEF DESCRIPTION OF THE DRAWING
The invention is explained in further detail in the ensuing description in terms of an exemplary embodiment shown in the drawing. The drawings schematically show the following:
FIG. 1, a longitudinal or meridial section through the f
REFERENCES:
patent: 3844674 (1974-10-01), Moriyama
patent: 4459087 (1984-07-01), Barge
Dobler Klaus
Huebel Michael
Strohl Willi
Freay Charles G.
Robert & Bosch GmbH
Striker Michael J.
Tyler Cheryl J.
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