JPS63154876A - Device for delivering fuel to engine from storage tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention relates to a device for delivering fuel from a storage tank, in particular to an engine of a motor vehicle, comprising a permanently magnetically excited electric drive motor and a drive motor. an operatively coupled displacement pump is provided, the rotationally driven delivery member of the displacement pump located close to the motor armature in the direction of the drive motor axis being located in the pump chamber, the pump chamber being rotated. A chamber wall which is bounded by two walls spaced apart from each other transversely to the axis and which is located between the motor armature and the delivery member is provided with a discharge opening; The invention relates to a type in which the outlet opens into a chamber belonging to the delivery conduit, which accommodates the electric motor and is surrounded by a casing.

BACKGROUND OF THE INVENTION A fuel delivery device of this kind is already known (DE 34 26 399), in which the delivery member is made of ferromagnetic material and is therefore attracted by the permanent magnets of the motor. In order to hold the delivery element in the pump chamber and thus make it possible for the first time to build up pressure in the delivery pump, the chamber wall provided with the outlet is screwed to the other housing part of the displacement pump. This configuration is expensive)
And it is not effective when assembling the device in modern assembly equipment.

Advantages of the Invention An advantage of the fuel delivery device according to the invention having the features of claim 1 is that parts of the device made of diamagnetic material are no longer adversely affected by a constant magnetic flux. The freely movable plate is essentially only influenced by the pressure ratio in the pressure chamber. The plate thus immediately rests against the other parts of the pump casing after starting the fuel delivery device and creates a sufficient separation between the motor chamber and the pump chamber surrounded by the casing. Assembling the plates is extremely simple, as they only need to be inserted. Fixation by screws or the like is no longer necessary.

The embodiments according to the dependent claims are advantageous embodiments of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a fuel tank 10 which is connected via a suction conduit 12 to the suction side of a fuel delivery device (hereinafter referred to as delivery device) 14 . A pressure line 16 is connected to the discharge side of the delivery device 14, which leads to the engine 18. When the engine is running, the delivery device 14 delivers fuel from the fuel tank 10 to the entire engine 18 .

As shown in FIG. 2, the delivery device 14 comprises an electric drive motor 20 and a displacement pump 22 coupled thereto, which in the non-embodiment is a so-called internal gear pump, also known as Geroto pump
rpumpe). The electric drive motor 20 has two permanent magnets 24 in the form of segments, which are mounted on the inner wall of a tubular return body 26 made of ferromagnetic material. At the terminal end 28 of the armature shaft 30 belonging to the drive motor 20, visible in FIG.
A partial delivery member 32 similar to an externally toothed spur gear belonging to the invention is arranged non-rotatably. This partial delivery element 32 meshes with an internally toothed ring gear 34, which likewise forms a partial delivery element. The inner toothed ring gear 34 is connected to the outer ring 36
The outer ring 36 is rotatably guided within the substrate 3.
8.

A movable shaft 30 of a drive motor is supported on the substrate 38 . On the side of the rotor part 32, 34 facing away from the base plate 38, a so-called support plate 40 is provided, the crescent-shaped shape of which is particularly visible in FIG. The support plate 40 is the mover shaft 30
It has two guide pins 42 extending parallel to the axis of rotation of the ring and forming stop shoulders which cooperate with stationary opposite shoulders 44 of the outer ring 36. Therefore, the guide pin 42 is located at the opposite shoulder 4 of the outer ring 36.
Together with 4, it constitutes a rotation prevention member for the support plate 40. In particular, as shown in FIG. 2, the support plate 40 is loosely arranged, in other words not connected to the outer ring 36. The support plate 40 has a certain play 46 when viewed in the direction of the axis of rotation of the armature shaft 30, and this play is limited by a stop 48. The stopper 48 is the return path body 2
6 and also has the function of supporting and fixing the permanent magnet 24. Furthermore, as can be seen in FIG.
A suction port 52 is provided in the area. This suction port 52
opens into the pump chamber of the delivery pump 22 in the region of the suction side 54 .

The support plate 40 is provided with a discharge opening 41 in the region of the discharge side 56 of the delivery pump 22 . The outlet opening 41 is formed by the closure plate 40 being open in this area, whereby the closure plate 40 acquires its crescent-shaped shape.

The partial delivery parts 32, 34 of the delivery pump 22 are made of diamagnetic material, preferably plastic. This also applies to the support plate 40 and its guide pin 42.

In the embodiment shown in FIG. 4, the same parts as in the embodiment shown in FIG. 6 are indicated by the same symbols.

The difference is that the support plate 140 of the delivery device 114 has a closed shape different from a crescent shape and is provided with a segment-shaped part 160 in the area of the delivery side 56 of the delivery pump 22 as a delivery opening. ing. Discharge port 4 based on Fig. 6
1 and 4 open into a so-called pressure chamber 70, in which a portion of the drive motor 20 is arranged. This pressure chamber 70 is surrounded by a pressure-tight casing 72, which also surrounds the delivery pump 22, in which a suction connection 50 is provided. The housing 72 also has a discharge connection (not shown), to which the pressure line 16 (FIG. 1) is connected.

When the delivery device 14 is switched off, the support plate 40 contacts the retainer 48 of the permanent magnet 24 with a decreasing distance 46 . Activation of the delivery device 14 creates a sudden delivery pressure in the pressure chamber 70 , which causes the support plate 40 or 140 to come into contact with the outer ring 36 of the delivery pump 22 . This effectively separates the suction region 54 of the delivery pump 22 from the pressure chamber 70 and thus eliminates power losses. The reason why this effect occurs is that the surface of the support plate 40 facing the pressure chamber 70 is
This is because it is significantly larger than the surfaces facing Nos. 2 and 34 that are subjected to pressure loads.

Due to the fact that the delivery elements 32, 34 and the support plate 40 as well as their guide pin 42 are made of diamagnetic material, all these components are not subject to the negative effects that occur when they are made of ferromagnetic material. If all these components are made of ferromagnetic material, the permanent magnet 24 will pull the support plate 40 or 140 away from the outer ring 36 and also the delivery member 32, 34' of the delivery pump 22 from the outer ring 36. drawer over at least a portion;
The pump chamber consisting of the suction region 54 and the discharge region 56 is therefore no longer sealed in the axial direction, and no pressure buildup occurs against the action of the magnetic force. The easily insertable support plate according to the invention is located, as it were, floatingly in the area between the stop 48 and the outer ring 36 and contacts the outer ring 36 during slight pressure fluctuations that occur when starting the delivery device. do. In this case, care should be taken not to select the play 46 so excessively that no pressure is built up on the pressure dowel 0. The support plate 40 thus forms a chamber wall on its side facing the delivery member 32, 34, which chamber wall delimits the pump chamber.

On the opposite side, the pump chamber is bounded by a wall facing the delivery member. In short, the substrate 38 includes the support plate 40 and the outer ring 3.
6 together form a stationary pump casing, the two walls being arranged transversely to the armature axis of rotation and spaced apart from one another.

In principle, the structure according to the invention can also be used advantageously in roller cell pumps, provided that the rotor, the roller body or the pump body and the loose plate delimiting the pump chamber are made of diamagnetic material. It is.

[Brief explanation of the drawing]

1A is a schematic diagram of a device equipped with a fuel tank, a fuel delivery device, and an engine; FIG. 2 is a partially enlarged vertical cross-sectional view of the fuel delivery device of the first embodiment of the invention at the delivery pump;
3 is a sectional view taken along the line mm in FIG. 2, and FIG. 4 is a sectional view of the second embodiment of the present invention in the same manner as in FIG. 10...Fuel tank, 12...Suction conduit, 14...
- Fuel delivery device, 16... Pressure guide, 18... Engine, 20... Drive motor, 22... Displacement pump, 24... Permanent i-stone, 26... Return body, 28...・
・Terminal end, 30... Mover shaft, 32... Partial delivery member, 34... Internal toothed ring gear, 36... Outer ring,
38... Substrate, 40... Support plate, 41... Discharge port,
42... Guide pin, 44... Opposing shoulder, 46... Play, 48... Stopper, 50... Suction connection part, 52
...Suction port, 54...Suction side, 56...Discharge side

Claims (1)

[Claims] 1. A device for delivering fuel from a storage tank, in particular to an engine of a motor vehicle, comprising a permanently magnetically excited electric drive motor and a displacement pump operatively connected thereto. , a rotationally driven delivery member located close to the motor mover as seen in the direction of the drive motor axis is located in a pump chamber, the pump chambers being arranged transversely to the rotation axis and spaced apart from each other. The chamber wall, which is delimited by two walls and located between the motor armature and the delivery member, is provided with a discharge opening which accommodates the electric motor and which is connected by the casing. In the enclosed version, which opens into the chamber belonging to the delivery conduit, the wall with the discharge opening (160) is provided with a plate (40 or 140) which is freely movable in the axial direction between the stoppers (48). and the delivery member (32, 34) and plate (40) of the pump (22).
A device for delivering fuel from a storage tank to an engine, characterized in that the fuel is made of diamagnetic material. 2. Claim in which the stop for the plate (40) is formed by the stationary pump casing (36) and by the holder (48) for the permanent magnet (24) of the electric motor (20). The device according to item 1. 3. When viewed in the rotational direction of the delivery member (32, 34), the plate (
40) has at least one stop shoulder (42), which stop shoulder cooperates with an opposite shoulder (44) formed on the pump casing (36). The device according to item 2.