Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
  • F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle

Definitions

• the invention relates to a pump combination which has a first pump and at least one second pump, the first pump being used to deliver lubricating oil to an internal combustion engine.
• Pump combinations of this type are known.
• a pressure pump for oil production of the lubricating oil of the internal combustion engine as an external gear pump in connection with three further suction pumps.
• These suction pumps are also designed as gear pumps.
• the disadvantage of this concept is that the individual pump stages are installed axially one behind the other, so that there must still be a pressure-tight separation between each pump stage. This makes this system very large axially.
• a pump combination which has a first pump and at least one second pump, the first pump being a vane pump for conveying lubricating oil from an internal combustion engine, i.e. operating as a pressure stage, and the first pump additionally providing an oil supply to at least the second one Provides pump.
• the second pump can be represented by a mono-vane cell pump, for example of a vacuum pump type, the lubricating oil supply of which is provided by the first pump for lubricating a clutch and the rotating group and for sealing the sealing gaps.
• a monoflade cell pump has the advantage that the ratio of installation space to usable space is very positive. Because this pump principle is already used at very low levels Pump speeds sufficiently well, a reduction in pump size compared to conventional gear pumps for the application "suction" is possible. This can reduce the friction and the air-oil flow in the oil pan area. Oil mixture or particularly suitable only from air.
• a pump combination is preferred in which the second pump is represented by a two-stroke vane pump, the lower vane pressure supply of which is provided by the first pump.
• a pump combination is also preferred in which the under-wing pressure supply of the second pump is provided by the under-wing pressure supply of the first pump. This is particularly possible if the delivery volume of the first pump is significantly larger than the delivery volume of the second pump. Attaching the lower vane pressure supply of the smaller second pump to the lower vane supply of the larger first pump is thus easily possible in the inner area of the vane pump without great manufacturing effort.
• a pump combination which has a first pump as a double-stroke vane pump and a second pump as a double-stroke vane pump and a third pump as a single-vane pump and the oil supply to the second and third pumps is represented by the first pump. Since the first pump represents a so-called pressure stage and can deliver oil under pressure, it can take over the under-wing supply or the lubricating oil supply of the other two pumps, which work, for example, as suction stages and therefore cannot build up excess pressure and therefore not enough pressure for your own oil pressure supply ,
• a pump combination according to the invention is characterized in that the second two-stroke vane pump as a suction pump, for example for the lubricating oil from Turbochargers, superchargers or compressors.
• a pump combination is preferred in which the two suction kidneys of the second vane pump are connected to two independent suction areas that are separate from one another and each suction area sucks, for example, the lubricating oil of one turbocharger, charger or compressor.
• the great advantage of the two separate suction kidneys due to the design of the double-stroke vane pump is that practically two pumps can be produced in a small axial space, which also do without axial partition walls, as would be the case with two gear pump suction stages. In addition to the advantage of the small axial installation space depth, the advantage of fewer parts, less assembly effort and lower costs should be emphasized.
• a pump combination is also preferred, in which the two pressure kidneys of the second vane pump deliver into a common pressure range which is connected to the oil pan of the internal combustion engine.
• a pump combination is preferred in which the housing of the second vane pump can be made of plastic. This is possible because this second vane pump, which works as a suction stage, is only subjected to a slight negative pressure and is not burdened by excess pressure, since it delivers practically no pressure back into the oil pan.
• a pump combination is preferred in which the second vane cell pump can have a positive guidance under the vanes by means of a contour ring instead of a lower vane pressure supply. This has the advantage that the contour ring extends the wings in the suction area even at low speeds, which means that the oil can be sucked in immediately at the start. At higher speeds, the centrifugal forces then extend the wings in the suction area.
• the mono-vane cell pump serves as a suction pump / bilge pump for part of the oil pan, which, for. B. by the motor vehicle due to its design, it is located away from the area of the oil pan from which the main oil feed pump sucks in the oil, and that the suction pump sucks out any oil or an oil-air mixture from there (from the oil sump) or, if there is no more oil-air mixture, air and feeds back into the main oil sump of the oil pan of the internal combustion engine in the area of the oil suction point of the first pump.
• the motor vehicles are on a slope in the field, the need to extract oil from distant areas of the oil pan to the suction point of the main oil pump may be necessary.
• the mono-vane cell pump has expanded opening cross sections (compared to a conventional vacuum pump) without check valves. This has the advantage that this mono-vane cell pump can also be operated with high oil peaks without high pressure peaks during suction and thus prevents the pump from being destroyed.
• a pump combination is also preferred in which the housing of the mono-vane pump is made of plastic. This is possible because the pump working as a suction stage experiences little negative pressure and low pressure peaks on the pressure side. This also enables housings with larger tolerances that do not require any reworking.
• the mono-vane cell pump has lubrication pockets in the rotor bearing for interval lubrication of the sealing gaps.
• a pump combination according to the invention was characterized in that all three pumps are driven by a common shaft. Furthermore, a pump combination is preferred in which the first pump, i.e. the vane pump for the pressure stage, is a two-stroke vane pump and has a pressure control valve and a temperature switching valve which, when the temperature rises, switches a second flood of the vane pump from the unpressurized circulation into the pressure circuit. A pump combination is also preferred in which the first pump has an adjustable stroke volume adjustment.
• Figure 1 shows a pump combination according to the invention in cross section.
• Figure 2 shows an external view of the pump combination with a view of the drive shaft.
• Figure 3 shows a further cross section through the pump combination.
• Figure 1 shows a cross section through the pump combination with 3 pumps.
• the rotor 5 of the first vane pump 7 is arranged on a drive shaft 1 in the shaft area 3. Furthermore, a section through the cam ring 9 can be seen.
• the vane pump 7 is housed in a housing 11 which is closed by an end cover 13.
• the end cover 13 also serves as a receiving housing for the second vane pump 15, which is much smaller and narrower than the first vane pump 7.
• the rotor 17 of the second vane pump 15 is arranged on the shaft area 19 of the shaft 1 and is also driven by the shaft 1.
• a section through the lifting ring 21 of the second vane pump 15 can also be seen.
• a coupling part 23 can be seen on the shaft section 19 of the shaft 1, which engages in a rotor 25 of the mono-vane cell pump 27.
• the mono-vane pump 27 is flanged to the second vane pump 15 by a housing flange 29 and is by a Housing part 31 completed towards the outside.
• the cross section of the monofoils 33 can be seen within the rotor 25.
• the first pump forms the main oil feed pump for an internal combustion engine of a motor vehicle and sucks in lubricating oil from the oil sump, which is supplied to the lubrication points of the internal combustion engine under pressure.
• the second, much smaller vane pump 15 serves as a suction pump for turbochargers, superchargers or compressors present in the motor vehicle and sucks the lubricating oil back into the oil pan of the internal combustion engine from there.
• the third pump, the mono-vane pump 27, serves as a suction pump for remote areas of the oil pan, from which under certain circumstances, such as. B. at an inclined position of the motor vehicle in the field, the oil can no longer get to the suction point for the main oil pump 7 by its own oil return flow.
• the monoflea cell pump 27 is particularly suitable for delivering both oil-air mixtures and pure air, which occurs as soon as the corresponding suction process for the remote oil pan areas has been completed.
• the second vane pump 15, not shown in the illustration, is designed as a double-stroke vane pump and thus practically represents two pumps in one component. Double-stroke vane pumps as such are known and are therefore not described further here. Due to this design, a double pump is arranged in this axially very narrow area, in which the first flood can dispose of a first turbocharger and the second flood a second turbocharger of the lubricating oil.
• this pump combination ideally contains pump types that are specially selected for the corresponding task areas and is additionally characterized by a small axial installation space, which is particularly favorable for the installation situation in a motor vehicle engine oil pan.
• FIG. 2 shows a top view of the pump housing 11 with a view of the shaft 1 protruding from the housing.
• the housing 11 additionally has installation spaces 35 and 37 for a pressure control valve and a temperature switching valve.
• the temperature switching valve has the function of switching one of the two floods into low-pressure circulation at low oil temperatures in the likewise two-stroke main pump 7 and, at high oil temperatures, when the internal combustion engine has a high demand for lubricating oil, the second flood to the first flood, i.e. switch to the print area.
• the pressure control valve regulates the maximum permissible oil pressure in the lubricating oil system.
• the housing 11 also has flange surfaces 39 which provide the transition to the oil pan or other engine areas and to the lubricating oil system and also have the corresponding bushings for the oil channels.
• FIG. 3 shows a further section through the pump combinations according to the invention.
• the same components as in FIG. 1 are provided with the same reference symbols and are not to be explained again to avoid repetition.
• the oil supply of the second pump 15 and the third pump 27 by the first pump 7 can be seen in FIG.
• the housing part 13 which closes the housing 11 of the pump 7 and at the same time represents the housing for the second pump 15, an oil channel 41 can be seen, which leads from the under-wing oil supply of the pump 7 to the under-wing oil supply of the pump 15.
• the Function of hydraulic pressure supplies under the wings is also known and is therefore not further explained here.
• the under-wing pump of the pump 7 is generally supplied with the pressure oil of the pump 7 and thus also delivers pressure oil via the line 41 to the pump 15, which serves as a suction pump for the turbocharger and therefore cannot build up any remarkable oil pressure. For this reason, this pump could not press the blades out of the slots appropriately with its own oil pressure.
• the oil supply goes via the under-wing pump of the second pump 15 by means of an oil supply channel 43 to the clutch 23 of the mono-wing cell pump 27. This provides both the clutch 23, which engages in the rotor 25, with the necessary lubricating oil and also the rotor bearings of the rotor 25 and the Treads of the monofoil, not shown here, within the rotor 25.
• the lubricating oil serves to seal the gaps in the case of pure air delivery.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Lubrication Of Internal Combustion Engines (AREA)
• Details And Applications Of Rotary Liquid Pumps (AREA)
• Applications Or Details Of Rotary Compressors (AREA)
• Eye Examination Apparatus (AREA)
• Control Of Positive-Displacement Pumps (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=32863810

Family Applications (1)

Country Status (6)

Cited By (5)

Families Citing this family (8)

Citations (5)

Family Cites Families (19)

• 2004
  • 2004-02-12 US US10/545,460 patent/US20060213477A1/en not_active Abandoned
  • 2004-02-12 WO PCT/DE2004/000250 patent/WO2004072444A1/de not_active Ceased
  • 2004-02-12 DE DE502004005825T patent/DE502004005825D1/de not_active Expired - Lifetime
  • 2004-02-12 AT AT04710336T patent/ATE382778T1/de not_active IP Right Cessation
  • 2004-02-12 EP EP04710336A patent/EP1597459B1/de not_active Expired - Lifetime
  • 2004-02-12 JP JP2006501496A patent/JP2006517634A/ja active Pending

Patent Citations (5)

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