EP1631745B1 - Vane-cell pump provided with a deep-drawn metal-sheet pot - Google Patents

Abstract

A pump, for instance for conveying lubricating oil to an internal combustion engine, in particular to multi-stroke vane-cell pump in which a rotatable group comprises a rotor whose vanes are movable at least in a radial direction, a stroke profile, vane heads tightly sliding along said profile and two lateral axial lids in the form of lateral plates or casing walls, the stroke profile and the first axial lateral plate being embodied in the form of a metal sheet pot.

Description

The invention relates to a pump, for example for conveying lubricating oil of an internal combustion engine, in particular a multi-stroke vane pump, wherein the rotation group comprises a rotor with at least radially movable vanes, a Hubkontur on which the wings with their wing heads sealingly slide along, and two axial side covers, as has side plates or housing walls.

Such pumps are known. They have in their side plates axial inlet openings and outlet openings, which must be separated according to their pressure ranges, for example by sealing means or the like and therefore cause a large axial length in such vane pumps. Also, the components of the known rotation groups, such as. As side plates made of sintered steel and contour rings made of solid steel or sintered steel, according to thick-walled and thus require both a large radial and axial space.

Such a vane pump is disclosed, for example, in Japanese Laid-Open Publication JP57097091 shown. The pump housing parts are made of die-cast and have integrated side plate contours in the housing parts. The contour ring itself is integrated in a disk-shaped die-cast housing part.

The publication DE19913632A describes a liquid ring pump whose housing consists of a deep-drawn sheet steel. However, an additional side plate 6 is inserted within the housing.

The publication FR-A-2660221 discloses a pump in which the stroke contour and a first axial side plate are represented by a steel sheet pot 6. However, the pump housing has a simple cylindrical contour and not the special contour necessary especially for a double-stroke vane pump. The sheet metal housing 6 itself is sealed on its open side by a flange 7, which obviously consists of cast material, whereby a relatively large axial space is created here as well.

It is therefore an object of the invention to present a pump which does not have these disadvantages.

The object is achieved by a pump, for example for conveying lubricating oil of an internal combustion engine, in particular a multi-stroke vane pump, wherein the rotation group comprises a rotor with at least radially movable vanes, a Hubkontur on which the wings with their wing heads sealingly slide, and two axial side covers in which the stroke contour and a first axial side plate are represented by a steel sheet pot and in which a second axial side plate is represented by a sheet steel cover, which is characterized in that the sheet metal lid has an embossed shoulder whose outer contour is the shape having the stroke contour. This has the advantage that the metal lid after insertion into the sheet metal cup, the rounding of the sheet metal cup, which are caused by the deep-drawing process, covered and thus produces tight sealing gaps within the rotation group. According to the invention, the metal lid can be produced by fine blanking or fine blanking.

A pump according to the invention is characterized in that the suction openings are represented by radial openings in the sheet metal pot. This has the advantage that the rotation group has a narrow construction, since the suction channel can be arranged radially around the sheet metal pot and does not have to be arranged axially on the opposite side of the pressure channel.

Also, a pump is preferred in which the outlet openings are represented by axial openings (pressure kidneys) and optionally at least one radial opening in the sheet metal pot. According to the invention, the radial outlet opening can be closed by a temperature switching valve or a pressure switching valve and thus produces a switchable delivery area. This has the advantage that, depending on the temperature-dependent or pressure-dependent lubricating oil requirement of the internal combustion engine, the pump delivers pressure oil with two delivery regions or delivers pressurized oil with only one delivery region and the second delivery region travels without pressure build-up, which can result in considerable power savings.

A pump according to the invention is characterized in that the temperature switching valve has an overstroke spring. This has the advantage that after closing the radial outlet opening by the temperature switching valve, if a further expansion of a thermal expansion element by increasing the temperature of the lubricating oil sets, the expansion element without deformation or destruction can perform an additional expansion path against the overtravel.

Preference is given to a pump in which the sheet metal pot of the rotation group and optionally the temperature switching valve or pressure switching valve are integrated in a plastic housing. The plastic housing is preferably finished sprayed and therefore requires no post-processing. The advantage is that an encapsulated in sheet rotation group is integrated in a plastic housing and so the advantages of the two types of material can be exploited.

Another pump according to the invention is characterized in that the axial outlet opening of the switchable delivery area can be closed by a spring-tongue check valve. In this case, the shape of the spring tongue check valve the Shape of Hubkonturkurümmung on. Furthermore, the spring tongue check valve is mounted on a pin made of plastic in the plastic housing. Also, the spring tongue check valve is protected by a stroke stop in the plastic housing from overstretching. This design of the spring-tongue check valve has the advantages of being very cost-effective and on the other hand also being space-neutral integrated in the pump.

A pump according to the invention is characterized in that the sheet metal pot has a notched or embossed cold-start ring, which in the cold operating state under the wings leads the wings according to the stroke contour to the outside and directs against the stroke contour. Furthermore, a pump is preferred in which the rotor has grooves or depressions for receiving the cold start ring. Also, a pump is preferred in which the sheet metal lid has a notched or embossed cold-start ring.

A pump according to the invention is characterized in that the sheet metal lid has embossed impression impression kidneys, that is to say pressure kidneys without passage openings which only effect an axial pressure surface compensation for the rotor in the pressure region.

Furthermore, a pump is preferred in which the one or more radial outlet openings of the switchable delivery region open into a channel which opens directly into the intake region of the second, non-switchable delivery region over a short path. This has the advantage that low flow losses and a favorable ducting lead to a low-energy pressure-free circulation of the switchable delivery area.

• Figur 1 zeigt eine Aufsicht auf die geöffnete Pumpe.
• Figur 2 zeigt den Schnitt B-B aus Figur 1.
• Figur 3 zeigt im Querschnitt den Blechtopf und den Rotor.
• Figur 4 zeigt ein Detail des Blechtopfes und des Blechdeckels.
• Figur 5 zeigt im Querschnitt die Rotationsgruppe und das Temperaturschaltventil.
• Figur 6 zeigt im Querschnitt das Temperaturschaltventil im geöffneten Zustand.
• Figur 7 zeigt das Pumpengehäuse mit dem Rückschlagventil.
• Figur 8 zeigt den Schnitt D-D aus Figur 7.
• Figur 9 zeigt im Querschnitt eine Ausführung des Kaltstartrings
• Figur 10 zeigt im Querschnitt eine weitere Ausführung des Kaltstartrings

The invention will now be described with reference to the figures.

• FIG. 1 shows a plan view of the opened pump.
• FIG. 2 shows the section BB from FIG. 1.
• Figure 3 shows in cross section the sheet metal pot and the rotor.
• FIG. 4 shows a detail of the sheet metal pot and the sheet metal lid.
• Figure 5 shows in cross section the rotation group and the temperature switching valve.
• Figure 6 shows in cross section the temperature switching valve in the open state.
• FIG. 7 shows the pump housing with the check valve.
• FIG. 8 shows the section DD from FIG. 7.
• Figure 9 shows in cross section an embodiment of the cold start ring
• FIG. 10 shows in cross section a further embodiment of the cold start ring

FIG. 9 shows the section C-C from FIG. 7.

In Figure 1, the pump according to the invention is shown in its housing in plan view without cover. The sheet metal pot 1, in which the Hubkontur is shown, contains the other parts of the rotation group such. As the wings 3, which are arranged in radial slots 5 slidably in the rotor 7. The rotor 7 has a recess 9, in which z. B. engages the crankshaft of an internal combustion engine and thus drives the lubricating oil pump. One speaks in this case also of a so-called wave neck pump. The rotation group is arranged with the sheet metal pot 1 in a plastic housing 11 and is closed by the sheet metal lid, not shown here. The completely encased in steel sheet rotation group has the advantage that here do not change the friction pairings. There are no sliding movements to plastic parts, so that a low-wear operation is possible. The sheet metal pot 1 is partially surrounded within the plastic housing 11 by a channel 13, which is acted upon by the suction pressure of the pump. Within the rotation group form by the shape of the stroke contour two pressure areas 15.1 and 15.2, in which the cells between wing, rotor, cam and side plates shrink and thus eject the pressure medium, and two suction 17.1 and 17.2, in which enlarge the corresponding cells and suck in the medium. The function of such a double-stroke vane pump is known and need not be explained further here. Within the housing, a temperature switching valve 19 is further arranged, which has a Dehnstoffelement within a housing 21 which can press a valve sealing plate 25 against the force of a return spring 27 against the sheet metal pot 1 with temperature increase of the lubricating oil via a pin 23. In the sheet metal pot 1, in this position, not shown here, a radial opening from which the pressure kidney 15.1 can promote pressure oil in the intake passage 13, as long as the temperature switching valve remains in this open state. The ejected from the pressure kidney 15.1 oil thus passes without pressure through the channel 13 to the suction kidney 17.2 of the second pump half and is thus sucked by the pump without much loss. The tin pot 1 has to 17.2 one or more radial openings in the intake of the suction kidney. Likewise, the suction kidney 17.1 of the first pump part has not visible here radial openings in the tin pot 1, through which 29 can be sucked oil from the suction channel. The suction channel 29 is as well as the suction channel 13 connected to the suction port 31, from which the oil from the engine compartment, such as. B. the oil pan, can be sucked. The oil is then expelled through the lubricating oil pump in the pressure channel 32 and supplied under pressure via the pressure port 34 to the engine. In the region 36 of the plastic housing, a pressure limiting valve, not shown here, is arranged, which opens when the maximum permissible pressure in the pressure region 32 is exceeded and, via the outflow channel 38, supplies the excess oil to the suction region 29.

In Figure 2, the section B-B of Figure 1 is shown. The sheet metal pot 1 is embedded in the plastic housing 11. The sheet metal pot 1 contains the rotation group and thus, inter alia, the rotor 7 shown here in cross section. The rotation group is closed by a sheet metal cover 40. In the sheet metal pot 1, the stroke contour, as shown in Figure 1, fed directly into the plate, and the bottom plate 42 of the sheet metal cup forms the first axial side plate of the rotation group. The cover 40 has a shoulder 44, which projects into the upper edge of the sheet metal pot 1, which in its outer contour also has the shape of the Hubkontur and thus represents the second axial side plate of the rotation group. To improve the Absaugfähigkeit the pump a plurality of radial openings 46 and 48 are introduced into the sheet metal pot 1 in the suction region. The intake ports 46 and 48 open into the intake ports 29 and 13, which are shown in Figure 1 in plan view.

In Figure 3, the design of the sheet metal pot 1 in the plastic housing 11 and the rotor 7 is shown enlarged. It can be seen that the sheet metal pot 1 at its upper end has a rounding 50, which is due to the deep drawing process manufacturing technology. The rotor 7 has on its side surfaces two grooves 52 into which a so-called cold-start ring 54 engages. The cold start ring 54 is notched or stamped out of the sheet metal pot 1 and also has the shape of the stroke contour on a reduced scale. This cold-start ring thus engages within the rotor grooves 52 under the wings and raise them along the contour so that they glide and seal almost at the contour ring, even if the wings are not pressed out by centrifugal forces or by additional pressure forces under the wing. Thus, a secure concern of the wing heads on the contour ring is ensured even at cold start and low speeds.

In Figure 4, the interaction of the sheet metal pot 1 is shown with the sheet metal cover 40 in particular in detail. Due to the deep-drawing process of the sheet metal pot 1, the rounding 50 is caused by production, but this would be problematic as a sealing surface or running surface for the wings. Therefore, the metal cover 40, which may be made as a flat component with a manufacturing process other than deep drawing, has a sharp-edged deformation of the shoulder 44, which covers the rounding 50 and thus ensures adequate sealing of the rotation group on the top of the rotor 7 and the wing heads , Thus, the wings are housed within the rectangular rotation group space with its side walls and its wing head sufficiently sealed.

Figure 5 shows in cross section the rotation group and the temperature switching valve. The same components are provided with the same reference numerals and will not be explained again here to avoid repetition. The temperature switching valve is extended in this illustration by increased temperature of the lubricating oil and closes with its valve body 25 an opening 56 in the pressure range. This leads to the pressure kidney 15.1 of Figure 1 can not promote in the non-pressurized circulation of the channel 13 and thus via a check valve 64, which will be shown in more detail later, promotes in the pressure channel 66, whereby both pressure kidneys supply the lubricating oil demand of the engine. The temperature switching valve 19 is housed with the housing of Dehnstoffkörpers 21 in a separate cover 62, wherein the Dehnstoffelementgehäuse 21 is supported with a so-called over-stroke spring 58 on a web 60 of the lid 62. The overstroke spring 58 secures the expansion element and the housing against overstretching by further increase in temperature and expansion of the expansion element, which works as follows: First, when the temperature increases the expansion element, the actuating rod 23 extend against the force of the spring 27 and thus with the Valve body 25, the pressure port 56 close. The spring 27, which serves as a return spring after cooling for the expansion element and brings the temperature switching valve back into the open position, is surrounded by a spring cup 68, which also serves as a guide for the rod 23 here. If a further expansion of the expansion element now takes place when the temperature switching valve is closed, then the expansion element can deflect against the stop 60 against the force of the overstroke spring 58 and thus avoid destruction of the expansion element or of the housing part supporting the expansion element.

In Figure 6, the temperature switching valve is in the open, i. shown in the cooled state. The valve closing body 25 has moved away from the radial pressure opening 56 of the sheet metal pot 1, and the pressure oil from the area 15.1 can now flow via the opening 56 into the channel 13 for pressureless circulation up to the suction kidney 17.2 from FIG. The spring cup 68 also serves to guide the actuating pin 23 of the temperature control valve. The return spring 27 has pushed back on the spring cup 68, the actuating pin and the cooled expansion element.

In Figure 7, the rotation group is removed from the figure 1, so that one can recognize the arrangement of the check valve 64 in an underlying pressure channel 70. The pressure channel 70 and the spring leaf 72 of the check valve 64 are adapted to the stroke contour, so that the spring leaf 72 of the check valve 64 can close the pressure kidney 15.1 of Figure 1. The check valve 64 is mounted by means of a plastic pin 74 in the housing 11 and is fixed by the latter after insertion of the sheet metal pot against the plastic housing.

Figure 8 shows the section D-D of Figure 7 and thus the Hubendanschlag 76 of the valve blade 72. Figure 9 shows in section C-C the plastic pin 74 which supports the spring leaf 72 in the plastic housing 11.

FIG. 10 shows in cross-section an alternative of the cold-start ring 54.1 to the illustration of the cold-start ring 54 in FIG. The cold start contour 54.1 is pressed out by stamping out of the sheet metal pot 1 and thus engages under the wing 3, which is mounted in the cam ring 7, and thus guides the wing 3 along the stroke contour of the metal cover 1 along.

In Figure 11, a further variant of the cold start contour 54.2 is shown, which is made by material displacement from the sheet metal pot 1 and thus also here can lead the wing 3 against the contour.

1. 1. Die axialen Toleranzen der Topftiefe können eliminiert werden, wenn das Aufschieben des Deckels 40 weggesteuert erfolgt.
2. 2. Durch den Tiefziehvorgang am Blechtopf 1 entsteht beim Übergang von der Hubkontur zum Blechflansch ein Radius 50 (vgl. Figur 3), der für die Volumetrie der Rotationsgruppe schädlich wäre. Bei Aufschieben auf den Absatz 44 des Deckels 40 wird der Radius 50 aus dem Funktionsbereich der Rotationsgruppe entfernt. Ein Vorteil der gekapselten Rotationsgruppe ist, dass nun alle wichtigen Konturen für die Steuerzeiten integriert sind und die Positionierung der kompletten Rotationsgruppe im Kunststoffgehäuse 11 größere Toleranzen zulassen kann.

During assembly, the sheet metal lid 40 is pushed onto the sheet metal pot 1 (cf., FIG. 2), and then fastened by a welding operation. This procedure offers several advantages:

1. 1. The axial tolerances of the pot depth can be eliminated if the sliding of the cover 40 is carried out path-controlled.
2. 2. Due to the deep-drawing process on the sheet metal pot 1, a radius 50 (see FIG. 3), which would be detrimental to the volumetry of the rotational group, is produced during the transition from the stroke contour to the sheet metal flange. When sliding onto the shoulder 44 of the cover 40, the radius 50 is removed from the functional area of the rotation group. An advantage of the encapsulated rotation group is that now all important contours for the timing are integrated and the positioning of the complete rotation group in the plastic housing 11 can allow greater tolerances.

In the pressure range of the switched stage axial and radial openings are provided. The openings in the radial direction with the temperature switching valve or a pressure switching valve are used for the non-pressurized circulation. The oil from the pressure side is flushed out again into the suction chamber for the suction of the next suction stage. Due to the channel guide thus obtained, only small flow losses result by deflection.

The big advantage of this pump design with corresponding radial and axial openings are the reduction of the required installation space as well as the cost reduction.

Claims (18)

1. Pump by way of example for supplying lubricating oil in an internal combustion engine, more particularly a multi-chamber vane-type pump in which the rotation module has a rotor (7) with at least radially movable vanes (3), a chamber contour along which the vanes (3) slide with sealing action by their vane heads, and two axial side covers, such as side plates or housing walls, wherein the chamber contour and a first axial side plate are formed by a sheet steel pot (1) and a second axial side plate is formed by a sheet steel cover (40), characterised in that the sheet metal cover (40) has an imprinted shoulder (44) whose external contour has the shape of the chamber contour.
2. Pump according to claim 1, characterised in that the sheet metal pot (1) can be manufactured by deep drawing.
3. Pump according to claim 1 or claim 2, characterised in that the sheet metal cover (40) can be manufactured by fine-stamping or fine-cutting.
4. Pump according to claim 1 to claim 3 characterised in that the suction intake openings are formed by radial openings (46, 48) in the sheet metal pot (1).
5. Pump according to claim 1 to claim 4, characterised in that the outlet openings are formed by axial openings (15.1, 15.2) (pressure kidneys) and where applicable by at least one radial opening (56) in the sheet metal pot.
6. Pump according to claim 5, characterised in that the radial outlet opening (56) can be closed by a temperature control valve (19) or a pressure control valve and thus produces a switchable delivery zone.
7. Pump according to claim 6, characterised in that the temperature control valve (19) has an overtravel spring (58).
8. Pump according to one of the preceding claims, characterised in that the sheet metal pot (19) of the rotation module and where applicable the temperature control valve (19) or pressure control valve are integrated in a plastics housing (11).
9. Pump according to claim 8, characterised in that the plastics housing (11) is injection moulded as a finished unit and therefore requires no finishing work.
10. Pump according to claim 6 to claim 9, characterised in that the axial outlet opening (15.1) of the switchable delivery zone can be closed by a spring tongue non-return valve (64).
11. Pump according to claim 10, characterised in that the spring tongue non-return valve has the shape of the chamber contour curvature.
12. Pump according to claim 10 or claim 11, characterised in that the spring tongue non-return valve (64) is mounted on a pivot (74) made of plastics.
13. Pump according to claim 10 to claim 12, characterised in that a chamber-limiting stop (76) in the plastics housing (11) is assigned to the spring tongue non-return valve (64).
14. Pump according to one of the preceding claims, characterised in that the sheet metal pot (1) has a notched or imprinted cold start ring (54, 54.1, 54.2).
15. Pump according to claim 14, characterised in that the rotor (7) has grooves or indentations to hold the cold start ring (54, 54.1, 54.2).
16. Pump according to claim 14 or claim 15, characterised in that the sheet metal cover (40) has a notched or imprinted cold start ring.
17. Pump according to one of the preceding claims, characterised in that the sheet metal cover (40) has imprinted mock pressure kidneys.
18. Pump according to one of claims 6 to 17, characterised in that the radial outlet opening (56) of the switchable delivery zone opens into a channel (13) which opens directly via the shortest route into the suction intake area (17.2) of the second non-switchable delivery zone.

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