WO2024132009A1 - Ölpumpe für getriebe eines elektrofahrzeugs - Google Patents
Ölpumpe für getriebe eines elektrofahrzeugs Download PDFInfo
- Publication number
- WO2024132009A1 WO2024132009A1 PCT/DE2023/100854 DE2023100854W WO2024132009A1 WO 2024132009 A1 WO2024132009 A1 WO 2024132009A1 DE 2023100854 W DE2023100854 W DE 2023100854W WO 2024132009 A1 WO2024132009 A1 WO 2024132009A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oil
- pump
- electric vehicle
- transmission
- vehicle according
- 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.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps; Pressure control
- F16H57/0441—Arrangements of pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02034—Gearboxes combined or connected with electric machines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0409—Features relating to lubrication or cooling or heating characterised by increasing efficiency, e.g. by reducing splash losses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0457—Splash lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/048—Type of gearings to be lubricated, cooled or heated
- F16H57/0493—Gearings with spur or bevel gears
- F16H57/0495—Gearings with spur or bevel gears with fixed gear ratio
Definitions
- Electric motors are used to power a motor vehicle to create alternatives to internal combustion engines that require fossil fuels.
- This article describes a drive unit for an axle of a vehicle (electromechanical axle drive train) which includes an electric motor which is arranged concentrically and coaxially to a bevel gear differential, with a switchable 2-speed planetary gear set being arranged in the power path between the electric motor and the bevel gear differential, which is also positioned coaxially to the electric motor or the bevel gear differential.
- the drive unit is very compact and, thanks to the switchable 2-speed planetary gear set, allows a good compromise between climbing ability, acceleration and energy consumption.
- an axially parallel arrangement in which the motor shaft of the electric motor is arranged axially parallel and at a distance from the output shafts of the differential.
- the electric motor shaft is arranged in alignment with the output shafts of the differential, with an output shaft being guided through the electric motor shaft.
- the electromechanical axle drive train can be designed with a switchable planetary gear with two gears or, in a simpler way, with just one gear (single gear).
- a gear (reduction gear) downstream of the electric motor (E-motor) in the power path reduces the usual high output speed of the electric motor and increases the torque introduced into the differential.
- the lubrication points are supplied by means of oil mist or by distributing the oil in the transmission through the gearing.
- a reservoir can also be provided in the upper area of the transmission housing, from which the cooling and/or lubricating oil then drips onto the lubrication points.
- the cooling and/or lubricating oil is pumped into the reservoir using the gearing and any baffles.
- This has the disadvantage that the constant immersion of one or more gears of a gear stage or a differential gear in the transmission oil results in splashing losses, which reduce efficiency. Splashing can also cause the oil to foam, so that a larger amount of oil must be kept in reserve to ensure a secure supply of oil in order to be able to pump oil safely.
- a gearbox with splash lubrication is known from the German patent application DE 37 19 096 A1.
- a lower gear is in a splash lubrication system, whereby an intermediate gear meshing with it is also supplied with oil.
- German patent application DE 102021 103667 A1 relates to a transmission of an electrically operable drive train of a motor vehicle, wherein the transmission has a first transmission section which is arranged in a first transmission chamber, wherein the first transmission section has a first rotatably mounted gear and a second rotatably mounted gear engaging therewith, and wherein the transmission chamber comprises an oil sump filled with hydraulic fluid.
- the first gear engages in the oil sump so that, during operation of the electrically operable drive train, it transports hydraulic fluid from the oil sump by rotation and distributes it in the transmission chamber, wherein the first gear is partially circumferentially and radially enclosed on both sides by a first separate fluid guide element which can be inserted into the transmission chamber, so that the first gear rotates partially in a channel-like section of the first fluid guide element designed in this way.
- the second gear is partially circumferentially enclosed by a second separate fluid guide element which can be inserted into the transmission chamber.
- the transmission of an electric vehicle, with an oil pan, with an oil reservoir provided in the oil pan, with gears of the transmission arranged above a level of the oil reservoir, with an oil pump driven mechanically by means of a transmission shaft is characterized in that the oil pump has a pump piston guided in a pump housing, an eccentric driven by the transmission shaft to generate an up and down movement between the pump housing and the pump piston, and a check valve, and with a suction end of the pump being articulated in the oil pan.
- the transmission is thus "dry" by being provided with an oil pan or an oil reservoir in the transmission housing. No gear of a differential or a gear stage therefore runs in the oil reservoir. In this way, splashing losses are excluded.
- a simple mechanical oil pump is provided, which is inexpensive and supplies the lubrication and/or cooling points with oil in a targeted manner.
- the term pump piston refers to a tubular component that is immersed in a tubular section of the pump housing (or vice versa) and thus forms a common internal volume, i.e. the pump piston has an axial through-hole. Due to the eccentric connection of the pump housing to the drive shaft and the axially fixed but articulated connection of the suction end to the oil pan, the internal volume changes during operation, i.e. when the pump is driven.
- the eccentric has an oil channel and the shaft has an oil bore for discharging the pumped oil from the pump.
- Such an oil bore can open into an outlet opening from which the oil pumped from the oil pan exits.
- a control groove is provided between the eccentric and the pump housing to close an oil channel during a suction process. This ensures that during a suction process the negative pressure is present at the suction end of the pump in the oil pan and is not sucked in from the gear chamber or from the pressure side.
- the suction end of the pump is formed by the check valve.
- a connection to the oil pan can be created by having the check valve at its end facing the oil pan with a contour that engages in a counter contour attached to the oil pan in a pivoting manner but fixed in the direction of the longitudinal axis of the pump piston.
- the pump piston can, for example, be pushed into the counter contour of the oil pan and is then held in position axially by the pump piston.
- such a connection can also be created using a snap connection.
- oil pumps can be driven by the same or different gear shafts. This means that the volume of oil that can be pumped can be multiplied.
- the eccentrics of the individual oil pumps can be arranged so that they are rotated relative to one another, so that several working strokes are carried out per rotation of a drive shaft.
- Fig. 1 is a side view of a transmission of an electric vehicle with an oil pump mechanically driven by a transmission shaft
- Fig. 2 a view of the gearbox from Fig. 1 rotated by 90°
- Fig. 3a to 3c show a schematic sectional view of the oil pump in several working phases.
- a part of a transmission 1 is shown schematically, whereby a transmission housing is not shown.
- Four gear wheels 2, 3, 4, 5 are arranged in such a way that that the gears 2 and 3 and the gears 4 and 5 each form a gear stage.
- the gears 3 and 4 are attached to a common intermediate shaft 6.
- the gear 5 drives a differential 20, which in turn drives two drive wheels (not shown).
- Below the gears 2, 3, 4, 5 there is an oil pan 8 which is arranged and filled with oil (not shown) in such a way that the gear 5 does not dip into an oil sump.
- Figure 2 shows a view of the transmission from Fig. 1 rotated by 90° anti-clockwise, i.e. a view in which the oil pump 9 is visible in front of the gears.
- the oil pump 9 is driven by means of the intermediate shaft 6, with an eccentric 7 interposed to generate an up and down movement between a pump housing 10 and a pump piston 11.
- the end of the oil pump 9 that dips into the oil pan 8, i.e. the suction end, is formed by a check valve 13, which is articulated but axially fixed in the oil pan 8.
- Figures 3a, 3b and 3c explain the mechanical oil pump 9 and its function in more detail.
- Figures 3a, 3b and 3c show the same oil pump 9 in different working or functional positions, the oil pump is driven in a clockwise direction.
- the oil pump 9 consists of a driven pump housing 10, which consists of a cylindrical upper part and a pipe part connected to it. A cavity in the upper part is connected to a cavity in the pipe part in such a way that the pumped oil can pass through.
- the pump housing moves up and down, in which the pump piston 11 is axially movable and sealed to the environment.
- the pump piston 11 is connected at its end facing the oil pan 8 to a check valve 13, which in turn is connected to its valve housing 14 in the oil pan 8 in an articulated but axially fixed manner. is connected.
- the up and down movement of the pump housing 10 thus creates an enlargement and reduction of an interior space which is formed by the tubular part of the pump housing and a bore 12 of the pump piston 11.
- a negative pressure is created which is greater than the spring force of a spring 16 which presses a valve ball 15 sealingly against the valve housing 14.
- the check valve 13 thus opens and oil can be sucked in from the oil pan 8 and pumped into the pump housing 10.
- the suction phase ends and the pressure phase begins with a descending movement during which the interior space is reduced.
- a control groove 19 is arranged in the pump housing 10 in such a way that a connection between the interior of the pump housing 10 and the oil channel 18 is closed in the suction phase and released in the pressure phase.
- Fig. 3b shows the end of the suction phase and the beginning of the pressure phase, i.e. the eccentric has reached its highest position and the common interior space of the pump housing 10 and pump piston 11 has reached its maximum.
- the check valve 13 closes and the connection between the oil channel 18 and the oil bore 17 is released by means of the control groove 19, so the oil can escape through the oil bore 17.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202380078916.6A CN120187966A (zh) | 2022-12-20 | 2023-11-10 | 用于电动车辆的传动装置的油泵 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022134016.3 | 2022-12-20 | ||
| DE102022134016.3A DE102022134016B4 (de) | 2022-12-20 | 2022-12-20 | Ölpumpe für Getriebe eines Elektrofahrzeugs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024132009A1 true WO2024132009A1 (de) | 2024-06-27 |
Family
ID=89119505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2023/100854 Ceased WO2024132009A1 (de) | 2022-12-20 | 2023-11-10 | Ölpumpe für getriebe eines elektrofahrzeugs |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN120187966A (de) |
| DE (1) | DE102022134016B4 (de) |
| WO (1) | WO2024132009A1 (de) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT176457B (de) * | 1947-05-27 | 1953-10-26 | Motor Car Works Nat Corp | Einrichtung zum Schmieren eines Ausgleichsgetriebes, insbesondere für Kraftfahrzeuge |
| DE3719096A1 (de) | 1987-06-06 | 1988-12-15 | Iveco Magirus | Getriebe mit tauchschmierung |
| EP1491797A1 (de) * | 2003-06-25 | 2004-12-29 | Peugeot Citroen Automobiles S.A. | Implantation einer Ölpumpe in einem Getriebegehäuse eines Automobils |
| DE102014207255A1 (de) * | 2014-04-15 | 2015-10-29 | Zf Friedrichshafen Ag | Getriebeanordnung für ein Flurförderzeug |
| DE102014220309A1 (de) * | 2014-10-07 | 2016-04-07 | Robert Bosch Gmbh | Fahrzeuggetriebe mit integrierter Getriebeölpumpe |
| DE102021103667A1 (de) | 2021-02-17 | 2022-08-18 | Schaeffler Technologies AG & Co. KG | Elektrisch betreibbarer Antriebsstrang |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4139611A1 (de) * | 1991-11-30 | 1993-06-03 | Zahnradfabrik Friedrichshafen | Getriebe mit einer verdraengerpumpe |
| JP4225342B2 (ja) * | 2006-10-04 | 2009-02-18 | トヨタ自動車株式会社 | インホイールモータ構造 |
-
2022
- 2022-12-20 DE DE102022134016.3A patent/DE102022134016B4/de active Active
-
2023
- 2023-11-10 WO PCT/DE2023/100854 patent/WO2024132009A1/de not_active Ceased
- 2023-11-10 CN CN202380078916.6A patent/CN120187966A/zh active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT176457B (de) * | 1947-05-27 | 1953-10-26 | Motor Car Works Nat Corp | Einrichtung zum Schmieren eines Ausgleichsgetriebes, insbesondere für Kraftfahrzeuge |
| DE3719096A1 (de) | 1987-06-06 | 1988-12-15 | Iveco Magirus | Getriebe mit tauchschmierung |
| EP1491797A1 (de) * | 2003-06-25 | 2004-12-29 | Peugeot Citroen Automobiles S.A. | Implantation einer Ölpumpe in einem Getriebegehäuse eines Automobils |
| DE102014207255A1 (de) * | 2014-04-15 | 2015-10-29 | Zf Friedrichshafen Ag | Getriebeanordnung für ein Flurförderzeug |
| DE102014220309A1 (de) * | 2014-10-07 | 2016-04-07 | Robert Bosch Gmbh | Fahrzeuggetriebe mit integrierter Getriebeölpumpe |
| DE102021103667A1 (de) | 2021-02-17 | 2022-08-18 | Schaeffler Technologies AG & Co. KG | Elektrisch betreibbarer Antriebsstrang |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022134016A1 (de) | 2024-06-20 |
| DE102022134016B4 (de) | 2024-07-04 |
| CN120187966A (zh) | 2025-06-20 |
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