DE2701161A1 - FUEL SUPPLY UNIT - Google Patents

Description

system

for patent and

Utility model registration

119O h / ot / wi
Dec 22, 1976

company

Robert Bosch GMBH

7000 Stuttgart

Fuel order unit

summary

In the case of a fuel delivery unit, it is supplied with a roller cell pump and an electric motor driving this proposed, the carbon guides for the brushes of the electric motor on all sides to form closed and to be attached to a bearing plate by means of one-piece retaining claws.

was standing of the technique

The invention is based on a fuel delivery unit according to the preamble of the main claim. The known fuel feed pumps are not always precise enough in guiding the coals lying on the collector of the electric motor used, so that malfunctions can occur, especially in rough operation. Another disadvantage is that the coal guides used hitherto

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on the one made of a suitable plastic or molding material Bearing plate are not fastened precisely enough, so that under the action of the fuel and possibly with Material changes as a result of: loosening of the guide or a Discard faults can occur.

Advantages of the invention

The fuel delivery unit according to the invention with the characterizing Features of the main claim has the advantage that the entire brush holder area belonging to the electric motor is redesigned and through more precise guidance of the carbon brushes, through perfect attachment of the brushes receiving Quiver and other advantageous refinements ensure trouble-free operation.

In this context, the embodiments of the invention specified in the subclaims are also of particular importance.

drawing

Embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows a longitudinal section through an inventive Fuel feed pump, Fig. 2a shows a section along the line II-II of FIG. 1, FIG. 2b shows the representation of FIG. 2a in one Side view, Fig. 2c shows a detail representation in a cutout the type of fastening of the carbon guide, FIGS. 3a and 3b show a further exemplary embodiment of the present invention in a sectional view along the line II-II of FIG. 1 and in a side view and FIG. 4 shows in a enlarged detail view a preferred type of fastening

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an electrical connection line on a holding element of the Brush holder plate.

Description of the invention

The fuel pump shown in Fig. 1 consists of two main elements which are arranged one behind the other in the axial direction and are surrounded by a common housing 1, namely from a roller cell pump 3 arranged in the area of the intake port 2 and from an electric motor 4, which has a shaft drives, which led forward to the roller cell pump 3 is and a moving element via a transverse driver wedge 6 the roller cell pump 3 drives. The outlet of the fuel pump is denoted by 7; the sponsored Fuel also flows through the area of the electric motor and passes through a check valve 8 at the outlet connection the end. The shaft 5 is mounted in the housing at points 9a and 9b.

Since the roller cell pump selected as advantageous in the present exemplary embodiment and the electric motor 4 are not the subject of the invention, they do not need to be discussed further below; In the invention, the area of the brush holder plate, which is designated by 10, is important. The brush carrier plate supports the carbon brushes that are in contact with the collector 11 of the electric motor; the carbon brushes cannot be seen in the sectional view selected in FIG. 1; 2a shows the two carbon brushes 12a and 12b, which are opposite one another and are held by the brush carrier plate 10. The brush carrier plate 10 is mounted in a suitable manner on projections 13 and 14, which are the only ones visible, in the housing 1 and has a central passage opening 15 for the collector or the shaft to pass through .

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Of essential importance in the present invention is the formation of the carbon guide, that is to say the quivers 16a and 16b, within which the carbon brushes under the pressure of springs 17a and 17b in the direction of the collector are slidable.

The carbon guides consist of a sheet metal part 18a and 18b which is closed on all sides, is open at the front and rear in the direction of displacement of the coals 12a and 12b, forms a quiver and is fastened to the carrier plate 10 by means of retaining claws 19. The carrier plate can consist of any desired pressing material; As the illustration in FIG. 2b shows, the retaining claws 19 are arranged in one piece on the bottom wall 20 of the carbon guide 16b, viewed in the sliding direction of the carbon brush at the front and rear, and extend downward through corresponding openings in the carrier plate 10, where the retaining claws are folded.

In an advantageous embodiment, the charcoal quiver 16a, 16b is held on the carrier plate in that a holding plate 21 is inserted from below between the carrier plate and the folded claws, which with transverse projections takes on further carrier tasks, which will be discussed below. The quiver fastening thus results in a "sandwich construction" in the combination of metal (of the quiver plate) -plastic (of the carrier plate) -metal (of the holding plate). Resitex is preferably used as the material for the carrier plate 10. The carbon quivers have a slot at the top through which an electrical connection line 24 connected to the carbon brush at the top passes and allows it to run along with the gradual consumption of the carbon brush. At the end of the quiver, raised tabs 25 are arranged on both sides of the slot 23, which prevent the coal connecting line 24 from moving at the beginning . the! Quiver hooked. The inner rw. -rv / andung surrounds

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the rectangular carbon brush close fitting; the pressure on the carbon brush is applied by the correspondingly shaped wide spiral spring 17b mounted next to the carbon guide at 26, which is attached to a beveled rear surface 27 of the carbon brush. In this way one achieves a force component which acts on the quiver wall 28 in the transverse direction. One acting in the same direction, on the friction between the carbon brush and the collector to be returned force results at the inner end of the carbon brush, so that the carbon brush overall, it is always in contact with one wall of the quiver 28 and tilting is prevented.

Jer illustration of Fig. 2b can be seen particularly well, that the retaining plate 21, which is held below the carrier plate 10 by the retaining claws 19 of the coal quiver, over upward extensions 30 and 31 has. The extension 30 serves to support the spiral spring; the extension 31 forms a double support point for fastening electrical cables; a bent flap 33 on the metal sheet tongue 31 is used to clamp the carbon strand 24 (with subsequent soldering); a further sub-area 34 can can be connected to an external power supply.

On the carrier plate 10 is in addition to the mirror-image arrangement of a carbon guide with quiver and holding plate, the opposite the carbon guide 16b just explained, yet a further retaining plate 35 is provided, which is also fastened to the carrier plate 10 with retaining claws (not shown) and has an upwardly protruding extension 36 which is connected to the second power supply. from Starting from the holding plate 35 in the region 37, one interference suppression choke 38 is arranged on the carrier plate 10, the other one Connection on the underside with that of the carbon guide 16a

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arranged retaining plate is connected. The clamp-soldering attachment points the interference suppression chokes are denoted by 38a and 38b in FIG. 2b.

The carbon brush is in the front part that can be used for operation provided with a slot 40, whereby a better running behavior results.

The inclined rear wall of the carbon brush has a non-beveled portion, so that a stop surface 41 is formed, which prevents the spring from jumping off.

It has already been mentioned earlier that the retaining plates 21 at the same time with lobe-shaped extensions spring carrier and welding or welding. Are solder point carriers and carriers of solder terminals for external power supply; in an advantageous, in Figure 3a and 3b illustrated embodiment, these retaining plates are designed so that they are as a whole with their solder or welding support points are located below the carrier plate 10. In this way, the entire soldering process (or welding), which follows the clamping of the electrical leads, by dip soldering or welding in a multiple welding device to be carried out in one operation and also the cleaning of the soldered welded points can be done mechanically on one side, for example by brush action without difficulty and without the need to turn the brush holder plate, carry out.

The preferred design of the retaining plates can be seen particularly clearly in the illustration in FIG. 3b. The retaining plate 50, which is held by the ^{retaining claws 19 1 of} the carbon guide 16b *, initially has a downwardly bent portion 51, which then goes back upwards and through the carrier plate to form the outer connection point 53, forming a pocket-like protuberance 52 is led. The carbon strand 24 * is inserted into the clamping pocket 52 and clamped; the same thing happens on the opposite

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Lowing side at the clamping pocket 55 with carbon braid 56 with respect to the other carbon guide. In a similar way, all connection solder points for the interference suppression choke 38 'are also formed on the retaining plate 35 *, which is otherwise arranged on the upper side of the carrier plate 10, for free support point formation; corresponding pocket-like bends 57 of the retaining plate 35 'and 57' of a further retaining plate (not shown) extend downward and initially take the connecting wires of the interference suppression choke 38 'under the action of clamping; The soldering (or welding) is then carried out by dipping (or welding in a multiple welding device using a suitable mask cover), so that all pocket-like connection points, which initially only contain a clamping effect, can be firmly soldered (welded). The receiving pocket 57 'for the other connection end of the interference suppression throttle 38' is expediently formed directly and in one piece by the holding plate 50 ¹ assigned to the carbon guide 16a *, which is only visible through its receiving pocket 55 in the illustration in FIG.

Finally, an advantageous embodiment consists in that the support tab 60 originating from the retaining plate 35 for receiving the second external power supply (the first is fastened to the support tab 53, which is an integral part of the retaining plate 50) next to the central receiving slot 61 for the one to be inserted Wire still has two lateral recesses 62, 63, which extend approximately at the level of the middle slot 61. The supply wire is then fastened as shown in the detail view in FIG. 4; The wire is first passed through the middle slot 61, then bent to the right in the plane of the drawing behind the support tab 60, guided forward and inserted into the lateral recess 63 and then wrapped around the support tab 60 while being introduced into the recess 62 in that the wire end again in the middle

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Slot 61 can be inserted from behind and pushed forward. In this way an extremely secure fastening is achieved, which can be soldered at a later point in time.

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Claims (8)

Dec. 22, 1976 / Claims 1./Kraftstofnahmaggregat, in particular from roller cell pump _y and this driving electric motor existing fuel pump, with a surrounding housing and with a support plate for the brushes that are in operative connection with the collector of the electric motor, characterized in that the carbon guides are tubular, all-round closed quivers (16a , 16b; 16a ¹ , 16b '), which are attached to the carrier plate (10) with one-piece retaining claws (19, 19') guided through the latter. 2. Fuel delivery unit according to claim 1, characterized in that between the holding ^{claws (19, 19 1} ) folded over against the carrier plate (10) of the carbon quiver (16a, 16b; 16a ¹ , 16b ¹ ) from below holding plates (21; 50, 50 ' ) are placed and also encompassed by the retaining claws, which at the same time form support points for the carrier plate (10) for receiving and storing other circuit elements. 3. Fuel delivery unit according to claim 1 or 2, characterized in that that a holding tab (30) bent upwards and guided through the support plate (10) holds the pressure spring (17a, 17b) stores for the carbon brush (12a, 12b). 4. Fuel delivery unit according to one of claims 1 to 3, characterized in that a further holding tab (31) the carbon strand (24, 24 *) leading to the carbon brush (12a, 12b) is supported and, if necessary, in the form of a folded-over clamping connection at the same time forms a soldering point for an external power supply. 5. Fuel delivery unit according to one of claims 1 to 4, • 09829 / 0U1 1190 h / ot / wi Dec. 22, 1976 - / 6 ■ 3 · characterized in that the rear surface of the carbon brush (12a, 12b) in the area of action of the pressure spring (17a, 17b) is beveled in such a way that, together with the lateral force resulting from the friction with the collector, the Carbon brush is pressed against a lateral guide wall (28) of the carbon quiver (16a, 16b). 6. Fuel delivery unit according to one or more of the claims 1 to 5, characterized in that raised tabs (25) are provided on the carbon guide end, which a Prevent the carbon braid (24, 24 ', 56) from getting caught. 7. Fuel delivery unit according to one or more of the claims 1 to 6, characterized in that an additional holding plate (35) on the carrier plate (10) for storage a suppression throttle (38) is arranged, which the two- ; th connecting tabs (36; 60) for the attachment of an outer Power supply forms. 8. Fuel delivery unit according to one or more of the claims 1 to 7, characterized in that all soldering points for fastening carbon strands (24; 56) or interference suppression choke connections arranged below the carrier plate (10) to form a clamping pocket obtained by bending are in such a way that the dip soldering and the subsequent brush cleaning of the soldered joints are carried out in one operation can be. 809829/0141