EP4445048A1 - Getriebe mit einer ölzufuhr zwischen zwei getrieberäumen; sowie verfahren zum betrieb des getriebes - Google Patents
Getriebe mit einer ölzufuhr zwischen zwei getrieberäumen; sowie verfahren zum betrieb des getriebesInfo
- Publication number
- EP4445048A1 EP4445048A1 EP22803165.4A EP22803165A EP4445048A1 EP 4445048 A1 EP4445048 A1 EP 4445048A1 EP 22803165 A EP22803165 A EP 22803165A EP 4445048 A1 EP4445048 A1 EP 4445048A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transmission
- oil
- space
- receiving space
- housing
- 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.)
- Withdrawn
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
- F16H57/045—Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case
- F16H57/0453—Section walls to divide a gear sump
-
- 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
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps; Pressure control
-
- 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
- F16H57/0467—Elements of gearings to be lubricated, cooled or heated
- F16H57/0476—Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof
-
- 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
- F16H57/0482—Gearings with gears having orbital motion
- F16H57/0483—Axle or inter-axle differentials
Definitions
- the invention relates to a transmission for a drive train of a motor vehicle, with a housing and a differential unit arranged in a receiving space (first transmission space) of the housing, also on an underside of the housing, viewed in relation to a planned installation position (of the transmission) in the gravitational field , An oil collecting space is arranged.
- the invention also relates to a method for operating this transmission.
- EP 3 534 042 A1 discloses a drive train of a motor vehicle with a transmission.
- a collection container is provided in a housing of the transmission, which stores lubricating oil.
- a supply path is further provided in this case for supplying the lubricating oil, which is supplied by a differential gear mechanism during reverse running of the automobile.
- an outlet passage which is connected to an outlet port of an oil pump, is also connected to the catch tank.
- the object of the present invention to provide a transmission whose efficiency losses caused during operation by a coolant and/or lubricant delivery are reduced, while at the same time an adequate oil supply is ensured for a long service life of the transmission.
- this is achieved in that the oil collection space is spatially separated from the receiving space by an intermediate wall and is connected (hydraulically) directly to the receiving space by means of a connecting channel introduced in the intermediate wall.
- the oil collecting space in particular on the part of its intermediate wall, is formed by a plastic component inserted in the housing. That plastic component is fixed in the housing, for example in a positive and/or non-positive manner. As a result, the manufacturing effort for producing the intermediate wall is significantly reduced.
- the oil collection space is arranged at least in sections below the receiving space (again considered in relation to the gravitational field), a reliable functioning of the transmission is made possible.
- the receiving space forms/has a circumferential oil collecting channel on its radial outside, within which oil collecting channel an external toothing of an input wheel of the differential unit is attached. is arranged. This ensures that the input gear of the differential forms the component that simultaneously distributes and transports the oil in the receiving space. This ensures the functionality accordingly.
- the connecting channel is arranged radially at the level of the oil collecting rail, more preferably radially at the level of a widened area of the input wheel that has the external toothing.
- an intermediate gear assigned to the differential unit and/or operatively connected to the differential unit is arranged in the receiving space and there is an opening in the housing or in a component forming the partition wall, which opening connects the oil collecting space with the receiving space in the area of the intermediate gear .
- a radial gap between an inside of the housing/accommodating space and the external toothing has a height of between 1 mm and 5 mm. This further reduces the amount of oil required during operation.
- a pump is integrated in the oil collection space and/or an intake side of the pump is connected to the oil collection space.
- the pump is particularly preferably a non-reversible pump. This in turn further simplifies the manufacturing effort.
- the efficiency of the drive is further increased if the pump is connected to a cooling circuit flowing through an electric machine.
- gear chamber is even formed directly by the oil collecting chamber or, conversely, the oil collecting chamber is formed directly by the gear chamber, the effort involved in manufacturing the gear is further reduced.
- the invention relates to a method for operating a transmission according to the invention according to at least one of the previously described embodiments, with the differential unit rotating, an oil level built up in the oil collection chamber being kept above the connecting channel.
- an oil supply is implemented between two gear chambers (receiving chamber and oil collecting chamber) that are provided separately from one another. There is an opening (connecting channel) between the two gear chambers for optimal lubrication in the separate gear chambers.
- FIG. 1 shows a sectional view of a transmission according to the invention implemented according to a preferred exemplary embodiment, a differential unit of the transmission being shown in section in the longitudinal direction and a hydraulic connection of a receiving space accommodating the differential unit to an oil collecting space by means of a connecting channel being clearly visible,
- FIG. 2 shows a detailed view of FIG. 1 in the area of the connecting channel
- 3 shows a perspective view of the transmission from FIG. 1 from an outside, the transmission being shown partially in section, so that an intermediate wall spatially separating the oil collecting space relative to the receiving space can be seen
- FIG. 2 shows a detailed view of FIG. 1 in the area of the connecting channel
- 3 shows a perspective view of the transmission from FIG. 1 from an outside, the transmission being shown partially in section, so that an intermediate wall spatially separating the oil collecting space relative to the receiving space can be seen
- FIG. 2 shows a detailed view of FIG. 1 in the area of the connecting channel
- 3 shows a perspective view of the transmission from FIG. 1 from an outside, the transmission being shown partially in section, so that an intermediate wall spatially separating the oil collecting space relative to the receiving space can be seen
- FIG. 2 shows a detailed view of FIG. 1 in the area of the connecting channel
- 3 shows a perspective view of the transmission from FIG. 1 from an outside, the transmission being shown partially in section, so
- FIG. 4 shows a further sectional view of the partially illustrated transmission according to FIG. 1, the sectional plane now being selected in such a way that further transmission components can be seen in addition to the differential unit.
- a transmission 1 according to the invention according to a preferred embodiment can be seen in its entirety.
- the transmission 1 has a differential unit 4 .
- the differential unit 4 is coupled in the usual way on the input side to other transmission components, which are generally identified here as an additional transmission unit 14, and are further connected on the output side to the wheels of the motor vehicle.
- the differential unit 4 has an input wheel 12 forming the input.
- the respective output shaft 19a, 19b (output) of the differential unit 4, which is further connected to a wheel of the motor vehicle, can also be seen particularly well in FIG.
- the transmission 1 has the further transmission unit 14 having further gearwheel stages.
- the transmission 1 is preferably designed as a multi-speed transmission/manual transmission and can therefore be coupled to the input wheel 12 via a number of different gear ratios.
- the transmission 1 is more preferably designed as a hybrid transmission and therefore in a particularly preferred embodiment has an electric machine, not shown here for the sake of clarity, for driving the motor vehicle.
- the electric machine is then preferably also used in the housing 2 of the transmission 1.
- An output/rotor of the electrical machine is then preferably connected to the differential unit 4 by means of the transmission unit 14 .
- the gear chamber 15 accommodating the gear unit 14 forms an oil collection chamber 6 .
- This oil collection chamber 6 is formed on an underside 5 of the housing 2 in relation to the intended installation position of the transmission 1 as viewed in the gravitational field.
- the oil collection chamber 6, also referred to as the oil sump, is therefore used during operation to collect and temporarily store a certain quantity of oil and is therefore provided at the lowest point of the housing 2.
- a pump 13 which is only shown schematically here, is more preferably also used in the housing 2, in particular in the oil collection chamber 6, or is at least connected to this oil collection chamber 6 on the part of its suction line, which is not shown in detail for the sake of clarity. That pump 13 is then used to generate its own cooling circuit, which flows through the electrical machine. A certain oil level 16 for lubricating and cooling the corresponding components of the transmission 1 is therefore to be maintained in the oil collection chamber 6 .
- the differential unit 4 is accommodated in a receiving space 3 which is spatially separated from the oil collecting space 6 and thus also from the gear space 15 .
- the receiving space 3 therefore also forms a (first) gear space, which is separated from the (second) gear space 15 accommodating the gear unit 14 .
- the differential unit 4 is connected to the transmission unit 14 via an intermediate gear wheel 22 , which is assigned to the differential unit 4 and is in direct meshing engagement with the input wheel 12 .
- the intermediate gear 22 is still (at least partially) arranged in the receiving space. It is also indicated in connection with Fig. 4 that an opening 23 in the housing 2 or in which the intermediate wall 7 forming plastic component / component 17 is present, which opening 23 connects the oil collecting space 6 to the receiving space 3 in the area of the intermediate gear 22 .
- An intermediate wall 7 is inserted axially between the receiving space 3 and the oil collecting space 6 .
- That intermediate wall 7 is formed directly by a trough-shaped/curved, partially circumferential plastic component 17 .
- That plastic component 17 is also connected to the gear chamber 15, as shown in FIG. 4, and thus also ensures that oil is supplied to the gear chamber 15.
- the receiving space 3 is connected to the oil collecting space 6 through a connecting channel 8 introduced in the intermediate wall 7 to the underside 5 of the housing 2 .
- That connecting channel 8 is dimensioned in such a way that when the transmission 1 is in operation and the differential unit 4 is rotating, it supplies the receiving space 3 with an amount of oil that also corresponds to an amount that is discharged/transported away by the input gear 12 .
- the connecting channel 8 that, viewed in relation to an axis of rotation 20 of the differential unit 4, it is arranged at radial height (the radial direction is perpendicular to the axis of rotation 20) with the external teeth 11 of the input wheel 12.
- the connecting channel 8 is arranged at the radial height of a thickened area 21 of the input wheel 12, which in turn directly forms the external teeth 11. That thickened area 21 is also arranged in a widened oil collecting channel 10 of the receiving space 3 .
- the oil collection channel 10 directly forms the radial outside 9 of the receiving space 3 .
- a radial gap 18 between the outside of the external teeth 11 and the inside of the housing 2 is preferably about 1 mm thick/high (radial dimension) in this area.
- 1, 2 and 4 also show the filling state of the oil collection chamber 6 with oil that usually exists during operation. It can be seen here that according to a preferred method for operating the transmission 1, the corresponding supply devices, which are not shown here for the sake of clarity, and the pump 13 are operated in such a way that an oil level 16 within the oil collecting chamber 6 is higher/above the Connection channel 8 is / is held. This ensures that sufficient oil can be supplied to the receiving space 3 even when cornering accordingly.
- the catch mechanism according to the invention is based on an oil production within the gear compartment of a gear 1, which can be designed as a standard gear or a hybrid gear.
- a gear 1 which can be designed as a standard gear or a hybrid gear.
- an oiling system is proposed here, in which the oil is thrown over the differential wheel (input wheel 12). The oil is then collected in one or more containers and distributed from there through the gearbox 1 to enable lubrication of the bearings, gears and shafts.
- In transmission 1 there is an oil pump (pump 13) for cooling the electric machine(s). Pump 13 sucks the oil in the sump through an oil filter at the lowest point of gearbox 1.
- the differential wheel is immersed in a trough (oil collection channel 10) which is separated from the transmission sump (oil collection chamber 6) by a partition (partition wall 7).
- Two different oil levels can be built up using the transmission sump.
- a higher oil level in the pump intake area (in oil collection chamber 6) guarantees that the intake is always immersed in oil, i.e. even when accelerating in curves.
- a second space (receiving space 3) in the area of the differential gear is filled with a limited oil level. As a result, only the oil required to lubricate the gears and bearings is transported up. The result is an oiling system with limited churning losses, reduced drag torque and increased efficiency.
- a special oil conveying mechanism is thus provided between gear spaces (receiving space 3 and oil collecting space 6/gear space 15).
- the oil collection chamber 6 requires a higher oil level in order to ensure the suction capacity of the cooling circuit pump (pump 13) during cornering accelerations/the braking phase.
- the differential wheel is located in the other room (accommodating room 3).
- the differential requires permanent oil supply to ensure the function of the oiling system.
- the opening is designed and dimensioned in such a way that all lubrication points of the transmission 1 receive the precisely required quantity of oil through the pump effect of the differential (differential unit 4).
- the sum of the oil quantity required for all bearing lubrication points and gear wheel contacts takes place through this calibrated opening and the resulting coordinated oil delivery (via the input wheel 12).
- the oiling takes place only with the required amount of oil and splashing losses are minimized.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021132150.6A DE102021132150A1 (de) | 2021-12-07 | 2021-12-07 | Getriebe mit einer Ölzufuhr zwischen zwei Getrieberäumen; sowie Verfahren zum Betrieb des Getriebes |
| PCT/DE2022/100825 WO2023104232A1 (de) | 2021-12-07 | 2022-11-08 | Getriebe mit einer ölzufuhr zwischen zwei getrieberäumen; sowie verfahren zum betrieb des getriebes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4445048A1 true EP4445048A1 (de) | 2024-10-16 |
Family
ID=84358475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22803165.4A Withdrawn EP4445048A1 (de) | 2021-12-07 | 2022-11-08 | Getriebe mit einer ölzufuhr zwischen zwei getrieberäumen; sowie verfahren zum betrieb des getriebes |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4445048A1 (de) |
| KR (1) | KR20240051322A (de) |
| CN (1) | CN118339392A (de) |
| DE (2) | DE102021132150A1 (de) |
| WO (1) | WO2023104232A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022212783B3 (de) | 2022-11-29 | 2023-12-28 | Magna powertrain gmbh & co kg | Schmier- und Kühlsystem und Verfahren zum Betreiben eines Schmier- und Kühlsystems mit Notlaufschmierung eines elektrischen Antriebs |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2103301A (en) | 1981-06-11 | 1983-02-16 | Gkn Axles | Cooling axle lubricants |
| US5505112A (en) | 1994-02-18 | 1996-04-09 | Eaton Corporation | Churning loss reduction means for gear type devices |
| DE19833536C2 (de) | 1998-07-25 | 2002-06-13 | Audi Ag | Vorrichtung zum Entlüften eines Getriebes |
| DE10359505A1 (de) * | 2003-12-18 | 2005-07-14 | Bayerische Motoren Werke Ag | Getriebe mit einem sich in Abhängigkeit von der Getriebeöltemperatur dehnenden Dehnkörper |
| DE102010004222A1 (de) | 2009-01-19 | 2010-07-29 | Magna Powertrain Ag & Co Kg | Getriebe mit Schmiereinrichtung |
| JP5379541B2 (ja) | 2009-04-01 | 2013-12-25 | 富士重工業株式会社 | 電動駆動システム |
| US8707826B2 (en) * | 2010-01-05 | 2014-04-29 | Chrysler Group Llc | Axle with variable volume sump |
| WO2015092471A1 (en) | 2013-12-20 | 2015-06-25 | Volvo Truck Corporation | Differential arrangement and driven axle and automotive vehicle with improved lubrication |
| DE112017003474B4 (de) | 2016-09-30 | 2024-05-23 | Aisin Corporation | Fahrzeugantriebsgerät |
| DE102017102527A1 (de) | 2017-02-09 | 2018-08-09 | GETRAG B.V. & Co. KG | Fahrzeuggetriebe mit abgegrenztem Fluidraum |
| JP6923466B2 (ja) | 2018-02-09 | 2021-08-18 | トヨタ自動車株式会社 | 車両用駆動装置 |
| DE112020002019T5 (de) * | 2019-04-19 | 2022-01-20 | Nidec Corporation | Antriebsvorrichtung |
-
2021
- 2021-12-07 DE DE102021132150.6A patent/DE102021132150A1/de active Pending
-
2022
- 2022-11-08 WO PCT/DE2022/100825 patent/WO2023104232A1/de not_active Ceased
- 2022-11-08 CN CN202280080098.9A patent/CN118339392A/zh active Pending
- 2022-11-08 KR KR1020247011917A patent/KR20240051322A/ko active Pending
- 2022-11-08 EP EP22803165.4A patent/EP4445048A1/de not_active Withdrawn
- 2022-11-08 DE DE202022003323.0U patent/DE202022003323U1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023104232A1 (de) | 2023-06-15 |
| DE202022003323U1 (de) | 2026-01-19 |
| DE102021132150A1 (de) | 2023-06-07 |
| CN118339392A (zh) | 2024-07-12 |
| KR20240051322A (ko) | 2024-04-19 |
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