WO2024099684A1 - Getriebe für einen elektrischen antriebsstrang eines kraftfahrzeugs, elektrischer antriebsstrang sowie kraftfahrzeug - Google Patents
Getriebe für einen elektrischen antriebsstrang eines kraftfahrzeugs, elektrischer antriebsstrang sowie kraftfahrzeug Download PDFInfo
- Publication number
- WO2024099684A1 WO2024099684A1 PCT/EP2023/078493 EP2023078493W WO2024099684A1 WO 2024099684 A1 WO2024099684 A1 WO 2024099684A1 EP 2023078493 W EP2023078493 W EP 2023078493W WO 2024099684 A1 WO2024099684 A1 WO 2024099684A1
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- WO
- WIPO (PCT)
- Prior art keywords
- transmission
- shaft
- bearing
- motor vehicle
- cylindrical roller
- 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
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Classifications
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- 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
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/20—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
- F16C19/541—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
- F16C19/546—Systems with spaced apart rolling bearings including at least one angular contact bearing
-
- 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
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/001—Arrangement or mounting of electrical propulsion units one motor mounted on a propulsion axle for rotating right and left wheels of this axle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2410/00—Constructional features of vehicle sub-units
- B60Y2410/102—Shaft arrangements; Shaft supports, e.g. bearings
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
- F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
- F16C19/166—Four-point-contact ball bearings
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
- F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
- F16C19/361—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with cylindrical rollers
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2361/00—Apparatus or articles in engineering in general
- F16C2361/65—Gear shifting, change speed gear, gear box
Definitions
- the invention relates to a transmission for an electric drive train of a motor vehicle, an electric drive train for a motor vehicle and a motor vehicle with an electric drive train.
- a transmission device in countershaft design with a transmission input central shaft and a transmission input hollow shaft arranged concentrically thereto is known.
- the transmission device also comprises respective countershafts which are mounted in a housing.
- the transmission input central shaft is mounted directly in the housing in the area of its end facing away from a drive unit via a first bearing device.
- the object of the present invention is to provide a solution which enables a particularly efficient and acoustically optimized design of a transmission for an electric drive train of a motor vehicle.
- the invention relates to a transmission for an electric drive train of a motor vehicle, in particular a motor vehicle, in particular a passenger car.
- the motor vehicle is designed to be driven by means of the electric drive train using electrical energy.
- the motor vehicle is therefore an electric vehicle or a hybrid vehicle.
- the motor vehicle can comprise an electric traction machine as part of the electric drive train, which is designed to provide a torque for driving the motor vehicle.
- This electric traction machine can be designed to use electrical energy from a battery, in particular a high-voltage storage device of the motor vehicle, to generate the torque.
- the transmission is provided in order to adapt the torque generated by the electric traction machine to a desired torque and thus convert it into the desired torque.
- the transmission is in particular a non-switchable transmission.
- the transmission comprises a transmission input shaft which is designed to be connected in a rotationally fixed manner to a rotor shaft of an electric traction machine. This means that the torque generated by the electric traction machine is transmitted to the transmission input shaft via the rotationally fixed connection of the rotor shaft to the transmission input shaft.
- the transmission input shaft is assigned to a drive side of the transmission.
- the transmission further comprises an intermediate shaft which engages with the transmission input shaft. This intermediate shaft is in particular permanently connected to the transmission input shaft in a force-transmitting manner.
- both the transmission input shaft and the intermediate shaft have respective gears which mesh with each other to transmit the force.
- the transmission further comprises a transmission output shaft which engages with the intermediate shaft.
- This transmission output shaft is in particular permanently engaged with the intermediate shaft.
- both the intermediate shaft and the transmission output shaft can have respective gears which engage with one another for power transmission.
- the transmission output shaft is assigned to an output side of the transmission.
- the transmission output shaft can be operatively connected to respective wheels of the motor vehicle and thus provide the torque converted in the transmission for the wheels of the motor vehicle.
- the transmission thus comprises two gear ratios.
- the first gear ratio is formed by the engagement between the transmission input shaft and the intermediate shaft and the second gear ratio is formed by the engagement between the intermediate shaft and the transmission output shaft.
- the transmission further comprises a transmission housing on which the intermediate shaft is rotatably supported via two cylindrical roller bearings at their respective ends and via a four-point bearing.
- a first cylindrical roller bearing is arranged at a first end of the intermediate shaft and the second cylindrical roller bearing is arranged at an opposite, second end of the intermediate shaft.
- the four-point bearing is arranged at one of the two ends of the intermediate shaft, in particular axially next to the cylindrical roller bearing assigned to the same end. This means that the four-point bearing is arranged at one of the ends and no four-point bearing is arranged at the other end of the intermediate shaft.
- a first end of the intermediate shaft is thus supported on the transmission housing via a cylindrical roller bearing and a four-point bearing, whereas the second end of the intermediate shaft is only rotatably supported on the transmission housing via the cylindrical roller bearing.
- the cylindrical roller bearings serve as respective loose bearings, which enable secure radial support of the intermediate shaft in the transmission housing.
- the four-point bearing serves as a fixed bearing and enables axial support of the intermediate shaft on the transmission housing.
- the axial direction and the radial direction each refer to a rotation axis of the respective associated shaft, with the axial direction running parallel to the rotation axis and the radial direction being perpendicular to the rotation axis.
- the respective shaft is rotated about the associated rotation axis during operation of the motor vehicle.
- the cylindrical roller bearings serve as radial bearings and the four-point bearing as axial bearings.
- the cylindrical roller bearings enable a very rigid mounting of the respective shaft (the intermediate shaft or the gearbox output shaft) and thus enable only a very small shift in the tooth engagement between the respective shafts to occur. Since cylindrical roller bearings cannot absorb axial loads, the four-point bearing is also provided as an axial bearing.
- particularly small cylindrical roller bearings or four-point bearings can be selected for the mounting of the intermediate shaft on the gearbox housing. Because these bearings are particularly small, a particularly space-saving and low-weight mounting of the intermediate shaft is possible, which in turn means that the gearbox can be designed to be particularly compact and particularly light. Furthermore, only very small friction losses occur in the bearings due to their small size.
- the transmission output shaft is part of a differential.
- the differential is an epicyclic gear transmission with a drive shaft and two output shafts.
- the intermediate shaft can engage directly with an epicyclic gear carrier, which can also be referred to as a cage or basket, of the differential.
- the transmission output shaft can thus be designed as an epicyclic gear carrier or have the epicyclic gear carrier.
- the torque set by the transmission can be transmitted directly to the respective wheels of the motor vehicle via the differential.
- the differential enables the wheels of the motor vehicle to rotate at different speeds. This means that several wheels of the motor vehicle can be driven by means of a single electric traction machine.
- the transmission output shaft can be connected directly to a single wheel of the motor vehicle in a torque-transmitting manner, and a separate electric traction machine and a separate transmission can be provided for each wheel of the motor vehicle.
- the transmission output shaft as part of the differential, the electric drive train of the vehicle can be made particularly compact and space-saving.
- the transmission output shaft and the intermediate shaft are each rotatably mounted via two cylindrical roller bearings at their respective ends and via a four-point bearing on the transmission housing. The first and second gear ratios result in relatively high torques in the intermediate shaft and the transmission output shaft.
- the intermediate shaft has a torque that is more than three times as high as the transmission input shaft
- the transmission output shaft has a torque that is more than three times as high as the intermediate shaft.
- the cylindrical roller bearings enable the intermediate shaft and the transmission output shaft to be mounted very rigidly, so that a particularly small shift in the tooth engagement between the transmission input shaft and the intermediate shaft and between the intermediate shaft and the transmission output shaft is achieved. Tilting of the shafts and/or deformation of the shafts can thus be kept particularly low. As a result, the transmission is particularly quiet in operation.
- the four-point bearing and one of the cylindrical roller bearings are arranged axially directly next to one another and thus form a bearing unit.
- the respective shaft having this bearing unit can be mounted on the gearbox housing particularly easily, whereby the bearing unit can be attached particularly compactly in the gearbox housing.
- the bearing unit also enables particularly good stabilization of the respective shaft mounted on the gearbox housing via the bearing unit.
- the cylindrical roller bearings are arranged axially further out along the intermediate shaft than the four-point bearing. If the transmission output shaft is also rotatably mounted on the transmission housing via two cylindrical roller bearings at its respective ends and via a four-point bearing, the cylindrical roller bearings can also be arranged axially further out along the transmission output shaft than the four-point bearing. In other words, the cylindrical roller bearing is arranged closer to a next end of the intermediate shaft or the transmission output shaft than the Four-point bearings assigned to cylindrical roller bearings. The four-point bearing is thus arranged axially further inwards than the cylindrical roller bearings.
- the cylindrical roller bearings are arranged axially further outwards and the four-point bearing is arranged axially inwards.
- the respective cylindrical roller bearings can be designed to be particularly small and the gearbox can be assembled particularly easily.
- a cover-side cylindrical roller bearing is first positioned and then the four-point bearing is positioned.
- the respective gears and then the housing-side cylindrical roller bearing are then positioned. This means that particularly compact cylindrical roller bearings can be used.
- the intermediate shaft and the transmission output shaft are arranged parallel to one another and the four-point bearings are assigned to the same ends of the shafts or different ends of the shafts.
- both the intermediate shaft and the transmission output shaft are each mounted on the transmission housing at their ends via two cylindrical roller bearings and additionally via a respective four-point bearing.
- the respective four-point bearings of the intermediate shaft and the transmission output shaft can be arranged axially at respective identical ends and thus on the same side of the transmission, or can be arranged at opposite ends of the intermediate shaft and the transmission output shaft.
- the intermediate shaft and the transmission output shaft are arranged in particular parallel to one another and each have a first end assigned to the first side and a second end assigned to a second side opposite the first side.
- the intermediate shaft can have the four-point bearing at its first end, whereas the transmission output shaft has the four-point bearing at its second end.
- the intermediate shaft has the four-point bearing at its second end, while the gearbox output shaft has the four-point bearing at its first end. If the intermediate shaft and the gearbox output shaft have the four-point bearing at the same end, then the intermediate shaft and the gearbox output shaft can both have the associated four-point bearing at their first end or at their second end. If the four-point bearings on the intermediate shaft and on the gearbox output shaft are arranged on the same side and therefore at the same ends, the gearbox can be installed particularly easily because the fixed bearings are thus arranged on the same side of the gearbox.
- the respective shafts can be stabilized particularly well if the four-point bearings are arranged particularly close to the gears of the second gear stage.
- the four-point bearing on the intermediate shaft is arranged closer to the gear that engages with the transmission output shaft than to the gear that engages with the transmission input shaft.
- the four-point bearing is arranged closer to the gear that engages with the intermediate shaft than to other gears on the transmission output shaft.
- the four-point bearing can be arranged directly axially next to the gear on the transmission output shaft that engages with the intermediate shaft. This allows the intermediate shaft and the transmission output shaft to be stabilized particularly well in the area in which the shafts are subjected to particularly high stress due to the power transmission from the intermediate shaft to the transmission output shaft.
- the transmission input shaft is rotatably mounted on the transmission housing via at least one deep groove ball bearing assigned to one of its ends.
- Deep groove ball bearings are very efficient bearings in which there is particularly little friction.
- the deep groove ball bearing enables a particularly efficient bearing of the transmission input shaft.
- This deep groove ball bearing can be arranged at a first end of the transmission input shaft, whereas the other end is connected to the rotor shaft in a rotationally fixed manner.
- the rotor shaft can in turn be rotatably mounted on the transmission housing via the so-called A-bearing, which is in particular another deep groove ball bearing.
- the very efficient deep groove ball bearing can be used, as this is sufficient for supporting the transmission input shaft.
- This deep groove ball bearing is also a particularly cost-effective rolling bearing, which also enables both axial and radial support of the transmission input shaft.
- the invention further relates to an electric drive train for a motor vehicle, with a transmission as has already been described in connection with the transmission according to the invention.
- the electric drive train also comprises an electric traction machine, the rotor shaft of which is connected to the transmission input shaft of the transmission in a torque-transmitting manner.
- the electric traction machine is designed to drive the motor vehicle using the electrical energy from a battery, in particular a high-voltage storage device of the motor vehicle, by transmitting the torque generated by the electric traction machine to at least one wheel of the motor vehicle via the transmission.
- the electric drive train is thus designed to drive the motor vehicle using electrical energy.
- the invention further relates to a motor vehicle with an electric drive train as described in connection with the electric drive train.
- the motor vehicle is an electric vehicle or a hybrid vehicle.
- FIG. 1 shows a schematic sectional view of a transmission for an electric drive train of a motor vehicle.
- a transmission 10 for an electric drive train of a motor vehicle in particular a motor vehicle, in particular a passenger car
- the transmission 10 is designed to transmit a torque generated by an electric traction machine of the motor vehicle and to transmit this converted torque to at least one wheel of the motor vehicle.
- the transmission 10 is designed to convert the torque received from the electric traction machine in several gear ratios, in this case two gear ratios 28, 30.
- the transmission 10 comprises a transmission input shaft 12, an intermediate shaft 14 and a transmission output shaft 16.
- a force in the form of a torque can be introduced into the transmission 10 via the transmission input shaft 12, whereby the force is in turn provided for the respective wheels of the motor vehicle via the transmission output shaft 16.
- the transmission output shaft 16 is part of a differential.
- the transmission output shaft 16 has the differential cage 32.
- the torque introduced into the transmission 10 via the transmission input shaft 12 is set in respective gear ratios 28, 30 via the intermediate shaft 14 on the transmission output shaft 16.
- the transmission input shaft 12 is connected to a rotor shaft 18 of the electric traction machine in a force-transmitting, in particular rotationally fixed manner.
- the transmission input shaft 12 has a first pinion 20 on the outside, which engages with a first gear 22 of the intermediate shaft 14 in a force-transmitting manner.
- the first pinion 20 and the first gear 22 are permanently in engagement with one another.
- the pinion is the smaller diameter of two meshing gears in a gear transmission.
- the intermediate shaft 14 has a second pinion 24, which engages, in particular permanently engages, with a second gear 26 of the transmission output shaft 16.
- the transmission 10 is therefore a non-switchable transmission.
- the gear ratio of the transmission 10 is therefore fixed. In the electric drive train, the torque or the speed at the wheels is thus set via the torque provided by the electric traction machine or the speed of the rotor shaft 18.
- the first pinion 20 and the first gear 22 represent a first gear ratio 28, whereas the second pinion 24 and the second gear 26 represent a second gear ratio 30.
- the transmission input shaft 12 is mounted on a transmission housing of the transmission 10 (not shown in Fig. 1) via respective deep groove ball bearings 34.
- the Deep groove ball bearings 34 provide both radial and axial support for the transmission input shaft 12.
- the transmission input shaft 12 is rotatably mounted on the transmission housing via two deep groove ball bearings 34.
- the transmission input shaft 12 is mounted directly on the transmission housing via a first of the deep groove ball bearings 34 and indirectly on the transmission housing via the rotor shaft 18 via the second deep groove ball bearing 34.
- the transmission input shaft 12 is inserted into a stub shaft of the rotor shaft 18 and this stub shaft of the rotor shaft 18 is rotatably mounted on the transmission housing via the second deep groove ball bearing 34.
- This second deep groove ball bearing 34 is a so-called A-bearing.
- the deep groove ball bearings 34 are particularly efficient bearings, which means that there is particularly little friction in the deep groove ball bearings 34.
- the first deep groove ball bearing 34 is a so-called C-bearing, which holds the transmission input shaft 12 axially and radially, but has some play.
- both the intermediate shaft 14 and the transmission output shaft 16 are rotatably mounted on the transmission housing via a first cylindrical roller bearing 36, a second cylindrical roller bearing 38 and a four-point bearing 40.
- the respective cylindrical roller bearings 36, 38 are arranged axially further out on the respective shaft than the four-point bearing 40 assigned to the same end of the respective shaft.
- the respective cylindrical roller bearings 36, 38 serve as floating bearings, whereas the four-point bearing 40 serves as a fixed bearing for the respective shaft.
- the four-point bearing 40 thus serves to axially support the respective shaft, whereas the cylindrical roller bearings 36, 38 serve to radially support the respective shaft.
- the respective cylindrical roller bearings 36, 38 are assigned to opposite ends of the respective shaft.
- first cylindrical roller bearing 36 is arranged at a first end of the respective shaft and the second cylindrical roller bearing 38 is arranged at a second end of the respective shaft opposite the first end.
- the four-point bearing 40 is assigned to one of the ends of the respective shaft. In this case, the four-point bearing 40 is also assigned to the first end of the respective shaft.
- the four-point bearing 40 forms a bearing unit together with the first cylindrical roller bearing 36. In this bearing unit, the four-point bearing 40 and the first cylindrical roller bearing 36 are arranged directly next to one another in the axial direction. This means that the first cylindrical roller bearing 36 and the four-point bearing 40 can touch one another laterally. As can be seen particularly well in Fig.
- the transmission input shaft 12, the intermediate shaft 14 and the transmission output shaft 16 are aligned with their respective axes of rotation 42 parallel to one another.
- the respective bearing units formed from the first cylindrical roller bearing 36 and the four-point bearing 40 are arranged on the same side on both the intermediate shaft 14 and the transmission output shaft 16 and thus on the left in Fig. 1.
- the bearing units on the intermediate shaft 14 and on the transmission output shaft 16 can be arranged at different ends.
- the bearing unit can be arranged at the first end of the intermediate shaft 14 and at the second end of the transmission output shaft 16 or vice versa.
- the arrangement of the bearing units depends on an alignment of the respective shafts or an arrangement of the respective gears or pinions on the shafts.
- the respective four-point bearings 40 or the respective bearing units are arranged closer to the second gear stage 30 than to the first gear stage 28.
- the four-point bearing 40 on the intermediate shaft 14 is arranged closer to the second pinion 24 than to the first gear 22.
- the four-point bearing 40 is arranged in the axial direction on the side of the second pinion 24 facing away from the first gear 22.
- the four-point bearing 40 is arranged in the axial direction directly next to the second gear 26.
- the four-point bearing 40 on the transmission output shaft 16 can be arranged radially inside a gear ring of the second gear 26. This means that the four-point bearing 40 is covered or enclosed radially outwardly by a ring gear of the second gear 26, at least in one axial length section.
- the four-point bearing 40 is thus arranged particularly close to a force introduction point of the transmission output shaft 16, wherein the torque is introduced into the transmission output shaft 16 via the second gear stage 30 via this force introduction point. Since larger torques act in the second gear stage 30 than in the first gear stage 28, the respective associated shaft, in this case the intermediate shaft 14, can be arranged particularly close to the second gear stage 30. or the transmission output shaft 16, can be particularly well stabilized, whereby the risk of tilting of the shafts can be kept particularly low.
- the respective four-point bearing 40 is fixed to the gearbox housing and serves as a fixed bearing for the respective associated shaft.
- the gearbox 10 can be installed particularly easily if all fixed bearings and thus all four-point bearings 40 are arranged on the same side of the gearbox 10.
- the four-point bearing 40 has no or only a very small amount of play, which results in axial fixation of the respective associated shaft.
- the four-point bearing 40 prevents axial displacement of the associated shaft, whereby the respective four-point bearing 40 can move radially in the gearbox housing.
- the torque introduced into the gear 10 via the rotor shaft 18 is increased via the respective gear ratios 28, 30, whereby greater forces act in the second gear ratio 30 than in the first gear ratio 28.
- Particularly strong bearings are therefore advantageous for stabilizing the shafts implementing the second gear ratio 30.
- the four-point bearing 40 is particularly compact and particularly light and thus has weight and installation space advantages. Since the four-point bearing 40 is not designed to absorb radial forces well, the cylindrical roller bearings 36, 38 are also provided, which have a high radial torque.
- particularly small bearings can be used, which are designed to be particularly compact and particularly lightweight. Furthermore, these bearings have particularly low friction forces due to their particularly small size.
- the transmission 10 can have the transmission output shaft 16, which is connected to only one wheel of the motor vehicle in a torque-transmitting manner.
- the transmission 10 can therefore have a transmission input shaft 12, an intermediate shaft 14 and a transmission output shaft 16 for each wheel of the motor vehicle to be driven, in accordance with the arrangement described.
- the described transmission 10 is based on the technical need to produce a transmission for an electric drive train that is as efficient and acoustically optimized as possible.
- Known rolling bearings are either very stiff and thus cause little deformation of the gear shafts and a small shift in the tooth engagement, or they are very efficient.
- Very stiff bearings such as tapered roller bearings cause little shift in the tooth engagement, but are disadvantageous in terms of efficiency.
- Very efficient bearings such as pure deep groove ball bearings are very efficient and thus have low loss torques or friction torques, but cause a relatively large deformation and/or tilting of the gear shafts and thus a shift in the tooth engagement. This results in a large, torque-dependent spectrum of a contact pattern and thus acoustic disadvantages.
- the transmission 10 has a combination of efficient four-point bearings 40 as axial bearings and cylindrical roller bearings 36, 38 as radial bearings.
- the cylindrical roller bearings 36, 38 result in a very rigid bearing and thus a small displacement of the respective tooth meshes. Since the cylindrical roller bearings 36, 38 cannot absorb axial loads, at least one four-point bearing 40 is also provided as an axial bearing.
- this bearing concept on the differential, and thus the transmission output shaft 16, as well as on the intermediate shaft 14 and the deep groove ball bearing of the transmission input shaft 12, a very small displacement of the tooth meshes is achieved in both gear ratios 28, 30 of the arrangement shown in Fig. 1.
- the motor vehicle can in particular have an electric drive with an electric motor, a first gear ratio 28, a second gear ratio 30 and a differential.
- the motor vehicle can have an electric drive with two electric motors and each with a first gear ratio 28 and a second gear ratio 30 without a differential.
- the transmission input shaft 12 is supported by deep groove ball bearings 34, whereby the first deep groove ball bearing 34, which is arranged next to the first pinion 20, serves as a fixed bearing.
- the intermediate shaft 14 is supported by the four-point bearing 40 as a fixed bearing on a transmission cover side of the transmission housing and two cylindrical roller bearings 36, 38 as floating bearings or radial bearings.
- the transmission output shaft 16 or the differential cage 32 is supported by the four-point bearing 40 as a fixed bearing on the transmission cover side and two cylindrical roller bearings 36, 38 as floating bearings or radial bearings.
- the respective four-point bearing 40 is in each case in the The gear cover of the gear housing or on the gear shaft is radially exposed.
- the proposed arrangement achieves a uniform deflection of the respective bearing points and thus a uniform tilting or deformation of the gear shafts and thus a small radial displacement and angular deviation of the meshing gears relative to one another and thus a small deviation in the meshing.
- the invention shows how a rolling bearing concept with separate radial and axial bearings can be created for a gearbox 10 of an electric drive.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- General Details Of Gearings (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202380060382.4A CN119731040A (zh) | 2022-11-08 | 2023-10-13 | 用于机动车的电动驱动传动系的变速器、电动驱动传动系和机动车 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022129428.5A DE102022129428A1 (de) | 2022-11-08 | 2022-11-08 | Getriebe für einen elektrischen Antriebsstrang eines Kraftfahrzeugs, elektrischer Antriebsstrang sowie Kraftfahrzeug |
| DE102022129428.5 | 2022-11-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024099684A1 true WO2024099684A1 (de) | 2024-05-16 |
Family
ID=88466806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2023/078493 Ceased WO2024099684A1 (de) | 2022-11-08 | 2023-10-13 | Getriebe für einen elektrischen antriebsstrang eines kraftfahrzeugs, elektrischer antriebsstrang sowie kraftfahrzeug |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN119731040A (de) |
| DE (1) | DE102022129428A1 (de) |
| WO (1) | WO2024099684A1 (de) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001190042A (ja) * | 1999-12-28 | 2001-07-10 | Honda Motor Co Ltd | 電動モータのロータ軸受の潤滑構造 |
| US20070211976A1 (en) * | 2004-05-07 | 2007-09-13 | Fox Gerald P | Locating Bearing Assembly for Wind Turbine Gearbox Shaft |
| DE102004043386B4 (de) | 2004-09-08 | 2013-02-21 | Zf Friedrichshafen Ag | Getriebevorrichtung in Vorgelegebauweise |
| DE102011085204A1 (de) * | 2011-10-26 | 2013-05-02 | Aktiebolaget Skf | Konzept zur Lagerung von Getriebewellen |
| CN210526278U (zh) * | 2020-03-03 | 2020-05-15 | 赛格威科技有限公司 | 驱动总成及车辆 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015149874A1 (de) * | 2014-04-04 | 2015-10-08 | Gkn Driveline International Gmbh | Antriebsanordnung für ein kraftfahrzeug |
| DE102021204808A1 (de) * | 2021-05-12 | 2022-11-17 | Zf Friedrichshafen Ag | Lageranordnung einer Zwischenwelle eines Übersetzungsgetriebes |
-
2022
- 2022-11-08 DE DE102022129428.5A patent/DE102022129428A1/de active Pending
-
2023
- 2023-10-13 WO PCT/EP2023/078493 patent/WO2024099684A1/de not_active Ceased
- 2023-10-13 CN CN202380060382.4A patent/CN119731040A/zh active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001190042A (ja) * | 1999-12-28 | 2001-07-10 | Honda Motor Co Ltd | 電動モータのロータ軸受の潤滑構造 |
| US20070211976A1 (en) * | 2004-05-07 | 2007-09-13 | Fox Gerald P | Locating Bearing Assembly for Wind Turbine Gearbox Shaft |
| DE102004043386B4 (de) | 2004-09-08 | 2013-02-21 | Zf Friedrichshafen Ag | Getriebevorrichtung in Vorgelegebauweise |
| DE102011085204A1 (de) * | 2011-10-26 | 2013-05-02 | Aktiebolaget Skf | Konzept zur Lagerung von Getriebewellen |
| CN210526278U (zh) * | 2020-03-03 | 2020-05-15 | 赛格威科技有限公司 | 驱动总成及车辆 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022129428A1 (de) | 2024-05-08 |
| CN119731040A (zh) | 2025-03-28 |
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