EP4463614A1 - Tandempumpe mit hauptflut und trockensumpfflut - Google Patents
Tandempumpe mit hauptflut und trockensumpfflutInfo
- Publication number
- EP4463614A1 EP4463614A1 EP22826336.4A EP22826336A EP4463614A1 EP 4463614 A1 EP4463614 A1 EP 4463614A1 EP 22826336 A EP22826336 A EP 22826336A EP 4463614 A1 EP4463614 A1 EP 4463614A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- pump
- dry sump
- main flow
- tandem
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
-
- 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
- F04C11/005—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of dissimilar working principle
-
- 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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
-
- 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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- 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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
-
- 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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
-
- 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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
-
- 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
- F04C2240/00—Components
- F04C2240/30—Casings or housings
-
- 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
- F04C2240/00—Components
- F04C2240/40—Electric motor
Definitions
- the invention relates to a tandem pump for an electric axle of a motor vehicle, with a dry sump flow through which hydraulic fluid can be conveyed from a transmission chamber into a hydraulic chamber, and a main flow through which hydraulic fluid can be conveyed from the hydraulic chamber to a hydraulic consumer.
- tandem pumps are already known from the prior art in which a dry sump functionality/dry sump flow is integrated in a pump for supplying hydraulic consumers.
- the prior art always has the disadvantage that there are strict installation space requirements for the structural design of the tandem pump, so that known tandem pumps do not fit into the available installation space in the axial direction or in the radial direction.
- a tandem pump is to be provided in which a dry sump functionality/dry sump flow is integrated in a pump for supplying hydraulic consumers and which at the same time satisfies the installation space requirements.
- the dry sump flow of the tandem pump should be able to draw a certain amount of air without generating acoustic abnormalities or air being able to get from the dry sump side to the main flow side.
- the invention relates to a tandem pump for an electric axle of a motor vehicle, with a dry sump flow through which hydraulic fluid can be conveyed from a transmission chamber into a hydraulic chamber, and a main flow through which hydraulic fluid can be conveyed from the hydraulic chamber to a hydraulic consumer, the dry sump flow and the main flow being formed by types of pumps with flow directions that differ from one another.
- a generic device in particular according to the invention in that the dry sump flow and the main flow are formed by types of pumps with mutually different flow directions.
- the inventive solution is that two types of pumps are used, which can be used in their flow direction in an optimal space.
- the dry sump flow can be formed by a pump type with an axial flow direction and the main flow can be formed by a pump type with a radial flow direction.
- the connections of the tandem pump can be arranged in such a way that the tandem pump fits into the given installation space.
- the dry sump flow is formed by a type of pump with a radial flow direction and the main flow is formed by a type of pump with an axial flow direction.
- the dry sump flow and the main flow can each have a separate inflow.
- a separate inflow is absolutely necessary if suction is to take place from two different reservoirs/tanks.
- the dry sump flow can draw in hydraulic fluid from the gear chamber and the main flow can draw in hydraulic fluid from the hydraulic chamber.
- the dry sump tide and the main tide can be formed by types of pumps with mutually different form factors.
- the dry sump flow can be formed by a gerotor pump or an internal gear pump.
- the dry sump flow can preferably be formed by a gerotor pump due to assembly-related advantages.
- a gerotor pump is a positive displacement pump.
- the gerotor pump has an inner and an outer rotor.
- the inner rotor has n teeth (at least two teeth), while the outer rotor has n+1 teeth.
- An axis of the inner rotor is offset from the axis of the outer rotor and both rotors rotate about their respective axes.
- the driving and the driven rotor are arranged eccentrically to each other. Since gerotor pumps (or internal gear pumps) are radially designed to save space compared to external gear pumps, a radial enlargement of the tandem pump can be prevented.
- Another advantage of using a gerotor pump for dry sump flooding is that gerotor pumps remain fully functional even with little contamination and air entry, which is particularly necessary for the conditions when used as dry sump flooding.
- the main flow can be formed by an external gear pump.
- An external gear pump is a positive displacement pump.
- the external gear pump has two identical gears that mesh with each other. One of the two gears is driven by a motor and the other of the two gears is driven by the driven gear. Since external gear pumps are designed to save space axially compared to gerotor pumps (or internal gear pumps), an axial enlargement of the tandem pump can be prevented.
- the dry sump flow and the main flow can be mechanically coupled to one another, so that a defined ratio between the main flow and the dry sump flow is set.
- the defined ratio between the two flows can be set by the different displacement volumes in order to meet the needs for the different requirements. to be able to meet the requirements of the respective flood.
- the mechanical coupling makes it possible to simplify the drive of the tandem pump.
- the dry sump tide and the main tide can be driven by a common motor. This means that only one motor is required to drive the dry sump flow and the main flow, so that a particularly cost-effective and space-saving tandem pump can be provided.
- each of the dry sump tide and main tide can be powered by its own engine.
- the main flow can have a driving gear that can be driven by the motor and a driven gear that can be driven by the driving gear.
- the dry sump flow can have a rotor that can be driven by the driven gearwheel of the main flow. This has the advantage that an axially parallel arrangement of the dry sump flow to the driving gear wheel and thus to the engine is made possible. At the same time it is ensured that the main flow and the dry sump flow can be driven via the common engine.
- the dry sump flow can be arranged axially parallel to the engine.
- the main flow (with its connections) can thus be designed to be particularly compact.
- the tandem pump can have a radial shaft sealing ring which separates the dry sump flow and the main flow from one another. This advantageously ensures that no leakage occurs between the two flows and no air can get from the dry sump flow into the main flow.
- the invention relates to a dry sump flood tandem pump.
- double-flow pumps are already known, for example in the form of vane pumps, in which the inflow is realized from a hydraulic reservoir, or, in particular, double-flow pumps in which a dry sump functionality/dry sump flow is integrated into the pump for supplying hydraulic consumers .
- double-flow pumps are already known, for example in the form of vane pumps, in which the inflow is realized from a hydraulic reservoir, or, in particular, double-flow pumps in which a dry sump functionality/dry sump flow is integrated into the pump for supplying hydraulic consumers .
- a tandem pump i.e.
- the dry sump flow/dry sump pump should suck out of the gear chamber and pump into a hydraulic chamber, while the main flow sucks out of the hydraulic chamber and the hydraulic consumers should serve. Due to the foaming of the oil in the gear compartment, it is necessary for the dry sump flow to be able to draw in a certain amount of air without generating any acoustic abnormalities. In addition, it is necessary that leakage between the two flows is prevented so that air from the dry sump side does not flash over to the main flow. Furthermore, the sealing between the housing parts of the hydraulic pump should be particularly economical by using the screw contact pressure, which requires the screws to be arranged at defined intervals. In order to be able to seal both flows at the same time in tandem pumps, the positioning of the screws is important.
- two (different) types of pumps are used, which can be used in the best possible installation space in terms of the flow direction.
- a combination of an external gear pump and a gerotor pump allows separate inflow of the floods or different inflow directions (radial/axial), which is necessary for suction from different reservoirs, so that the pump connections can be placed in such a way that the pump fits into the given space.
- This means that the use of two types of pumps with different form factors (“coaxial” and "parallel to the axis") enables an ideal arrangement of the hydraulic connections and the screwing points of the housing.
- the types of pumps are advantageous in terms of their low costs due to their parts price and in terms of their ease of industrialization.
- a combination of two external gear pumps would increase radially tion, since the connections of the main flow would have to be moved radially to the outside due to the axially parallel design of an external gear pump serving as a dry sump flow.
- a combination of two gerotor pumps would lead to an increase axially, since an axial inflow is necessary and the installation space would have to be increased axially by the height of the inflow channel.
- An internal gear pump can also be used instead of the gerotor pump, with the gerotor pump being particularly advantageous in terms of its simple assembly and being ideal for use as a dry sump pump, since it can cope with little contamination and with air entrainment.
- the pump flows can preferably be coupled mechanically as a tandem pump, so that a defined ratio between the two flows is set by the different displacement volumes in order to meet the needs for the different requirements for the main and dry sump flow.
- only one driving motor is required for this.
- the gerotor pump can be driven by coupling it to the driven wheel of the external gear pump, which allows the gerotor pump to be positioned parallel to the axis of the motor, which in turn means that the hydraulic connections of the external gear pump underneath can be arranged in the most compact manner.
- the connections can be placed radially further inwards.
- a radial shaft sealing ring can preferably be used between the flows, so that the ingress of air from the dry sump flow into the main flow is prevented.
- FIG. 1 is a longitudinal sectional view of a tandem pump with a dry sump flow and a main flow
- FIG. 2 shows a perspective view of the tandem pump, with a housing of the tandem pump not being shown, Figs. 3 to 6 perspective representations of the tandem pump, in which an oil flow of the dry sump flow and an oil flow of the main flow as well as a space requirement of the tandem pump is illustrated, and
- FIG. 7 shows a schematic sectional view of an arrangement of an inlet and an outlet.
- Figs. 1 to 6 show an embodiment of a tandem pump 1 according to the invention.
- the tandem pump 1 is used in particular in an electric axle of a motor vehicle in order to supply one or more hydraulic consumers with hydraulic fluid.
- the tandem pump 1 has a dry sump flow 2 through which hydraulic fluid can be conveyed from a gear chamber (not shown) into a hydraulic chamber (not shown).
- the tandem pump 1 has a main flow 3 through which hydraulic fluid can be conveyed from the hydraulic chamber (not shown) to the hydraulic consumer(s) (not shown).
- the dry sump flow 2 and the main flow 3 are formed by types of pumps with flow directions that differ from one another.
- the dry sump flow 2 in the illustrated embodiment is formed by a type of pump with an axial flow direction, preferably a gerotor pump 4
- the main flow 3 is formed by a pump type with a radial flow direction, preferably an external gear pump 5 .
- the dry sump flow 2 and the main flow 3 can each have a separate inflow.
- the main flow 3 has a suction-side connection 6 and a pressure-side connection 7, via which the hydraulic fluid can be fed into the main flow 3 or out of the main flow 3 is deductible.
- the suction-side connection 6 can be or is connected to the hydraulic chamber and the pressure-side connection 7 can be or is connected to the hydraulic consumer(s).
- the aspirated hydraulic fluid is introduced into the external gear pump 5 via the suction-side connection 6 , conveyed by the external gear pump 5 and discharged via the pressure-side connection 7 .
- the dry sump flow 2 has a suction-side connection 8 and a pressure-side connection 9 via which the hydraulic fluid can be fed into the dry sump flow 2 or can be removed from the dry sump flow 2 .
- the connection 8 on the suction side can be connected or is connected to the gear chamber and the connection 9 on the pressure side can be connected or is connected to the hydraulic chamber.
- the aspirated hydraulic fluid is introduced into the gerotor pump 4 via the suction-side connection 8 , conveyed by the gerotor pump 4 and discharged via the pressure-side connection 9 .
- the gerotor pump 4 is a positive displacement pump and has an inner rotor 10 and an outer rotor 11 .
- the inner rotor 10 has n teeth (six teeth here), while the outer rotor 11 has n+1 teeth (seven teeth here).
- An axis of the inner rotor 10 is offset (parallel) from the axis of the outer rotor 11, and both rotors 10, 11 rotate about their respective axes.
- the driving and the driven rotor 10, 11 are arranged eccentrically to each other.
- the external gear pump 5 is a positive displacement pump and has two identical gears 12, 13 which mesh with one another.
- a first gear 12 of the two gears 12, 13 is driven by a motor 14 and a second gear 13 of the two gears 12, 13 is driven by the first gear 12 (driven).
- the motor 14 is designed as an electric motor.
- the dry sump flow 2 and the main flow 3 are preferably mechanically coupled to one another, so that a defined relationship between the main flow 3 and the dry sump flow 2 is set.
- the dry sump tide 2 and the main tide 3 can be driven via a common motor, here via the motor 14 be.
- the driving rotor of the two rotors 10, 11 of the gerotor pump 4 is coupled to the second (driven) gear 13, so that the motor 14 drives the external gear pump 5 (or the first gear 12), and the external gear pump 5 (or The second gear 13) drives the gerotor pump 4.
- the dry sump tide 2 may be arranged axially parallel to the engine 14, i.e. to an axis of rotation of the engine 14.
- tandem pump 1 can have a radial shaft sealing ring 15 which separates the dry sump flow 2 and the main flow 3 from one another.
- the radial shaft sealing ring 15 is arranged on an intermediate shaft between the second gear 13 of the external gear pump 5 and the rotor 10 of the gerotor pump 2 .
- the external gear pump 5 is at the top and is designed with a radial flow in order to minimize axial installation space.
- the gerotor pump 4 is designed with an axial inflow in order to maintain radial installation space and to avoid a collision (or a radially outward displacement) of the connections 6 , 7 of the external gear pump 5 .
- Fig. 7 shows schematically the necessary design of an inlet 16 and an outlet 17 of gerotor pumps in general. A radial inflow is not possible with this type of pump due to the principle.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022100574 | 2022-01-12 | ||
| PCT/DE2022/100912 WO2023134809A1 (de) | 2022-01-12 | 2022-12-06 | Tandempumpe mit hauptflut und trockensumpfflut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4463614A1 true EP4463614A1 (de) | 2024-11-20 |
| EP4463614B1 EP4463614B1 (de) | 2026-03-11 |
Family
ID=84537473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22826336.4A Active EP4463614B1 (de) | 2022-01-12 | 2022-12-06 | Tandempumpe mit hauptflut und trockensumpfflut |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20250101978A1 (de) |
| EP (1) | EP4463614B1 (de) |
| CN (1) | CN118369490A (de) |
| WO (1) | WO2023134809A1 (de) |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2571377A (en) * | 1947-05-15 | 1951-10-16 | Prec Developments Co Ltd | Rotary displacement pump |
| US5145349A (en) * | 1991-04-12 | 1992-09-08 | Dana Corporation | Gear pump with pressure balancing structure |
| EP2085616B1 (de) * | 2008-01-29 | 2017-03-29 | LEONARDO S.p.A. | Schmiermittelpumpe |
| WO2009149682A2 (de) * | 2008-06-09 | 2009-12-17 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Motor-pumpen-modul |
| DE112011100440A5 (de) * | 2010-02-04 | 2012-11-29 | Ixetic Bad Homburg Gmbh | Tandempumpe |
| DE102011079822A1 (de) * | 2011-07-26 | 2013-01-31 | Zf Friedrichshafen Ag | Hydrostatische Pumpe und Automatgetriebe mit Getriebeölpumpe |
| DE102012212986A1 (de) * | 2011-08-17 | 2013-02-21 | Schaeffler Technologies AG & Co. KG | Außenzahnradpumpe |
| CA2906303A1 (en) * | 2013-03-20 | 2014-09-25 | Magna Powertrain Inc. | Tandem electric pump |
| JP6463616B2 (ja) * | 2014-10-07 | 2019-02-06 | 日本電産サンキョー株式会社 | ギアポンプ |
| DE102016104416B4 (de) * | 2016-03-10 | 2025-06-12 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Pumpe |
| JP6190938B1 (ja) * | 2016-10-11 | 2017-08-30 | 大同機械製造株式会社 | 内転歯車ポンプ |
| WO2018169376A1 (ko) * | 2017-03-17 | 2018-09-20 | 명화공업주식회사 | 듀얼펌프 |
| CA3124623A1 (en) * | 2018-12-31 | 2020-07-09 | Stackpole International Engineered Products, Ltd. | Pump assembly having two pumps provided in a single housing |
| DE102019201863B3 (de) * | 2019-02-13 | 2020-06-18 | Hanon Systems Efp Deutschland Gmbh | Kühl-Schmiersystem mit Trockensumpf |
| US12270396B2 (en) * | 2021-02-26 | 2025-04-08 | Ghsp, Inc. | Electric motor with dual pump for providing scavenge and delivery functions |
| DE102021114710A1 (de) * | 2021-06-08 | 2022-12-08 | Schaeffler Technologies AG & Co. KG | Hydrauliksystem und Verfahren zum Betreiben eines Hydrauliksystems |
-
2022
- 2022-12-06 US US18/728,202 patent/US20250101978A1/en active Pending
- 2022-12-06 EP EP22826336.4A patent/EP4463614B1/de active Active
- 2022-12-06 CN CN202280080635.XA patent/CN118369490A/zh active Pending
- 2022-12-06 WO PCT/DE2022/100912 patent/WO2023134809A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN118369490A (zh) | 2024-07-19 |
| WO2023134809A1 (de) | 2023-07-20 |
| EP4463614B1 (de) | 2026-03-11 |
| US20250101978A1 (en) | 2025-03-27 |
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