EP4338264A1 - Système de palier d'un module d'essieu électrique - Google Patents

Système de palier d'un module d'essieu électrique

Info

Publication number
EP4338264A1
EP4338264A1 EP22718891.9A EP22718891A EP4338264A1 EP 4338264 A1 EP4338264 A1 EP 4338264A1 EP 22718891 A EP22718891 A EP 22718891A EP 4338264 A1 EP4338264 A1 EP 4338264A1
Authority
EP
European Patent Office
Prior art keywords
bearing
input shaft
transmission input
arrangement
cover
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.)
Pending
Application number
EP22718891.9A
Other languages
German (de)
English (en)
Inventor
Tobias SCHLITTENBAUER
Timo Kiekbusch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4338264A1 publication Critical patent/EP4338264A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • 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

Definitions

  • the invention relates to a bearing arrangement of an e-axle module with an electric machine and a transmission and with a transmission input shaft with multiple bearings. Furthermore, the invention relates to the use of the bearing arrangement in the electric drive train of an electrically driven passenger car or an electrically driven commercial vehicle.
  • DE 10 2010048 131 A1 relates to an electric drive unit.
  • This includes a stator and a rotor, a gear and an electrical circuit and a housing.
  • the housing forms an engine compartment in which the electric machine is arranged and a transmission compartment in which at least part of the transmission is arranged.
  • the drive unit has a lubricating circuit, in which a lubricating fluid for lubricating and cooling the rotor of the electrical machine and the transmission is routed, with the lubricating fluid circulating between the motor compartment and the transmission compartment.
  • the drive unit has a cooling circuit, in which a cooling liquid for cooling the stator of the electrical machine and the electrical circuit is routed. The cooling liquid of the cooling circuit is in heat-exchanging connection with the lubricating liquid of the lubricating circuit.
  • EP 2 846439 A1 relates to an electrical machine with a shaft.
  • the electrical machine includes a rotor which interacts magnetically with the stator when the electrical machine is in operation. Furthermore, a first bearing device and a second bearing device and a shaft 2 provided, which is rotatably mounted in the first bearing device and the second bearing device about an axis of rotation.
  • the shaft has a first portion of a first material and a second portion of a second material sequentially in an axial direction of the axis of rotation, the rotor being fixed to the first portion of the shaft, and the first material and the second material being joined at a joint of the first section and the second section are integrally and homogeneously connected to one another.
  • a shaft is provided for the electric machine including the rotor and a series of electric machines comprising at least one first electric machine and at least one second electric machine, a method for producing an electric machine and a method for producing a series of electric machines.
  • the transmission drive unit is used in particular to adjust moving parts in motor vehicles and includes an electric motor which has a rotor arranged inside a stator. Furthermore, a reduction gear arranged coaxially thereto and having a drive shaft is provided, with the rotor being mounted on a hollow shaft, on the outer circumference of which at least one gear component driving the reduction gear is arranged axially next to the rotor and the output shaft penetrating the hollow shaft.
  • the bearing arrangement of an e-axle module is provided with an electric machine and a transmission as well as with a transmission input shaft with multiple bearings.
  • the bearing arrangement in the transmission is designed as a first X-arrangement of a cover-side bearing and a housing-side bearing, and the transmission input shaft has, starting from a bearing seat of the cover-side bearing, increasing diameters towards the center of the transmission input shaft.
  • a rotor pre-assembled on the transmission input shaft can be installed in the assembly direction and - 3 be mounted from the side of the e-axis module in which the electric machine is arranged when the e-axis module is complete. This makes it possible to test the electric machine that has already been assembled, with or without power electronics, before the gearbox is assembled on the e-axis module.
  • the transmission input shaft is either designed as a one-piece component within the bearing arrangement or alternatively made from several shaft sections made of different materials and joined by friction, laser or capacitor discharge welding.
  • the bearing arrangement proposed according to the invention for the e-axis module comprises the cover-side bearing, the housing-side bearing and an e-machine bearing.
  • the transmission input shaft is rotatably accommodated in three roller bearings.
  • the cover-side bearing, the housing-side bearing and the E-machine bearing are designed as radial deep groove ball bearings, as angular contact ball bearings, as cylindrical roller bearings or as tapered roller bearings.
  • the transmission input shaft has running teeth which are either made directly in the material of the transmission input shaft or which can be joined to the transmission input shaft via splines by means of a pinion.
  • the transmission input shaft with the preassembled rotor of the electric machine can be assembled in the assembly direction in a system housing or the E-axis module. This results in a significantly simplified manufacturing process, since the transmission and electric machine can be separated during assembly and these components can be tested.
  • the inventively proposed bearing assembly is characterized in that the transmission input shaft includes the bearing seat of the cover-side bearing, which is designed in a first diameter and the 4
  • Transmission input shaft has the running gearing, which is designed with a second diameter that exceeds the first diameter and the transmission input shaft has a bearing seat of the bearing on the housing side, which is designed with a third diameter that exceeds the first and second diameters, and the transmission input shaft has a running surface of a Includes sealing element, the fourth diameter of which exceeds the first, second and third diameters.
  • the transmission shaft whether it is designed in one piece or in several parts, can be joined from one side in the direction of assembly in the E-axis module.
  • This offers advantages in terms of production technology, since the continuous diameter gradation on the transmission-side part of the transmission input shaft allows the rotor to be pre-assembled on the transmission input shaft and test processes that are required during final assembly of the e-axis module can be decoupled from one another.
  • axial forces from transmission components of the transmission which act in the direction of the cover-side bearing, are supported directly or indirectly on the running teeth with the interposition of a sleeve.
  • a parking lock wheel optionally installed on the transmission input shaft is supported directly on the running splines or with the interposition of a sleeve on the running splines or an additional shaft shoulder of the transmission input shaft.
  • the invention relates to the use of the bearing arrangement in the electric drive train of an electrically driven passenger car or an electrically driven commercial vehicle.
  • the bearing arrangement proposed according to the invention provides a bearing concept that is very easy to assemble, flexible and robust in terms of its service life. A partial assembly of assemblies is possible, which enables the possibility of component testing when constructing the e-axis module and at the same time represents a highly integrated concept that is very cost-effective, compact and optimized in terms of its weight.
  • the arrangement of the cover-side bearing and the housing-side bearing in the area of the transmission of the E-axis module creates a mounting option that is ideally suited to supporting high gearing forces and a simple position of the preload between the cover-side bearing and the housing-side bearing to allow.
  • the axial forces that occur, generated by the transmission components of the transmission in the E-axis module, which act in the direction of the cover-side bearing, can be supported either directly on the running gear or indirectly via the interposition of a sleeve on the running gear.
  • the electric machine bearing has smaller dimensions and is therefore less expensive, since it only serves to absorb the comparatively small forces resulting from the weight of the rotor of the electric machine. 6
  • roller bearings are preferably used which are designed, for example, as radial deep groove ball bearings, as angular ball bearings, as cylindrical roller bearings or as tapered roller bearings.
  • the transmission input shaft which is supported in three ways by the bearing arrangement proposed according to the invention, can be produced in one piece or can be joined from individual shaft sections which are made of different materials. Friction, laser and capacitor discharge welding, for example, can be used to join the shaft sections made from different materials.
  • Friction, laser and capacitor discharge welding for example, can be used to join the shaft sections made from different materials.
  • the design of the transmission input shaft as a multi-part shaft made up of several shaft sections joined together offers the advantage that the most suitable material can be used for the functions, such as running gears and rotor shaft.
  • FIG. 1 shows the components of the bearing arrangement according to the invention, in which the transmission input shaft of an e-axis module is supported in multiple ways, - 7 -
  • Figure 2 shows the bearing assembly for multiple storage of
  • Transmission input shaft installed in an e-axle module with transmission and electric machine
  • Figure 3 is a schematic representation of the diameter gradation on the transmission input shaft
  • FIG. 4 shows a schematic representation of the first X-arrangement in the area of the transmission and the second X-arrangement on the outside of the E-axis module.
  • Figure 1 shows an embodiment variant of the bearing arrangement 22 proposed according to the invention, for multiple bearing of a transmission input shaft 24 in an E-axis module 10.
  • the E-axis module 10 includes in addition to the electric machine 12, a transmission 14.
  • the E-axis module 10 includes a system housing 16, which on a transmission side of the E-axis module 10 by a indicated transmission cover 18 is closed. On the opposite side of the e-axis module 10, the system housing 16 is closed, for example, by a gear cover 20 of the electric machine 12.
  • the transmission input shaft 24 is mounted in multiple bearings.
  • the transmission input shaft 24 comprises a rotor 26 which is surrounded by a stator housing 52 shown in FIG. 2, in which a stator 54 is located. 8th
  • the illustration according to FIG. 1 shows that the bearing arrangement 22 proposed according to the invention has a bearing 30 on the cover side.
  • the bearing 30 on the cover side can be adjusted with regard to its defined preload, for example by means of a shim washer 28 which is installed in the gear cover 20 .
  • Running teeth 34 are formed on the transmission input shaft 24 immediately next to the optionally available parking lock wheel 32 .
  • the torque of the electric machine 12 is introduced into the transmission 14 of the E-axis module 10 via this running gear 34 .
  • the transmission 14 in the E-axis module 10 also includes a bearing 40 on the housing side, the inner ring of which can be fixed in the axial direction on the transmission input shaft 24 with a retaining ring 38 .
  • the bearing 40 on the housing side is mounted in a system housing 16 indicated in FIG.
  • a sealing element 42 which interacts with a running surface which is not shown in detail. This is, for example, a radial shaft seal.
  • the sealing element 42 separates the interior of the electrical machine 12 from the interior of the transmission 14 that is wetted with a lubricant.
  • the transmission input shaft 24 is mounted in an electric machine bearing 44 within the framework of the bearing arrangement 22 proposed according to the invention.
  • This has smaller dimensions in comparison to the bearing 30 on the cover side and the bearing 40 on the housing side, since the electric machine bearing 44 on the side of the electric axis module 10 on which the cover 20 is mounted only supports the rotor 26 of the electric machine 12 supports.
  • the forces occurring in the transmission 14 are absorbed by the first-mentioned bearing components, ie the bearing 30 on the cover side and the bearing 40 on the housing side.
  • a wave spring 46 is arranged in the E-machine bearing 44, for example, so that any axial play that occurs in the transmission input shaft 24 can be compensated for.
  • a plate spring or a set of plate springs can be used.
  • the transmission input shaft 24 can be made in one piece from a continuous material.
  • the individual shaft sections can be made of different materials and can be joined to one another in a materially bonded manner at their joints using materially bonded connection methods, preferably friction welding, laser welding or capacitor discharge welding.
  • the multi-part design of the transmission input shaft 24 has the advantage that, depending on the function of the respective section of the transmission input shaft 24, a material that is optimally suitable for this can be selected.
  • roller bearings are preferably used as the cover-side bearing 30, the housing-side bearing 40 and the electric machine bearing 44—although this can also be made smaller.
  • These can be radial deep groove ball bearings or angular contact ball bearings,
  • the running gearing 34 shown in FIG. 1 can be produced directly in the area of the gearing 14 in the material of the gearing input shaft 24 or it can be shown as a pinion via a spline.
  • the pinion can be realized as an additional component in the form of a sleeve and have an additional axial fixation.
  • FIG. 2 shows the E-axis module 10 together with the transmission components 50 and the transmission input shaft 24, which is mounted in multiple bearings in the bearing arrangement 22 proposed according to the invention.
  • FIG. 2 shows that the torque generated by the electric machine 12 of the E-axis module 10 is transmitted via the running teeth 34 to gear components 50 of the gear 14 that mesh with one another.
  • the rotor 26 of the electric machine 12 rotates within a stator 54 which is accommodated in the stator housing 52 . 10
  • the cover-side bearing 30 is accommodated on a bearing seat 56 in the area of the transmission cover 18 , while the housing-side bearing 40 of the transmission input shaft 24 is accommodated on a bearing seat 58 of the transmission input shaft 24 .
  • a sealing element 42 that can be designed, for example, as a radial shaft sealing ring, which separates the interior of the transmission 14 from the interior of the electric machine 12, so that lubricant circulating in the transmission 14 can be kept away from the interior of the electric machine 12 of the e-axis module 10.
  • the representation according to FIG. 2 also shows that the electric machine bearing 44 accommodated on a bearing seat 62 of the transmission input shaft 24 is covered and closed off by the cover 20 on the electric axis module 10 .
  • the representation according to FIG. 3 shows in a schematic manner an embodiment variant of the transmission input shaft 24 to be mounted multiple times in the bearing arrangement 22 proposed according to the invention.
  • the transmission input shaft 24 which is shown in the representation according to Figure 3 in a perspective view and without components arranged on it, is mounted in the mounting direction 64 from the side of the electric machine 12 in the E-axis module 10 installed.
  • the transmission input shaft 24 has individual gradations of functional diameters. These are designed in such a way that, starting from the bearing seat 56, which serves to accommodate the cover-side bearing 30, the functional diameters of the individual components are designed to increase counter to the assembly direction 64.
  • the bearing seat 56 for accommodating the cover-side bearing 30 is designed with a first functional diameter 66 .
  • a second functional diameter 68 of the running gear 34 (addendum circle diameter) adjoining the bearing seat 56 is designed in the second functional diameter 68 which exceeds the first functional diameter 66 of the bearing seat 56 of the transmission input shaft 24 .
  • a third functional diameter 70 is provided, on which the bearing seat 58 for receiving the bearing 40 on the housing side is formed.
  • Transmission input shaft 24 is provided by a running surface 60 for the sealing element 42, which is designed as a radial shaft seal.
  • the fourth functional diameter 72 exceeds the third functional diameter 70, which in turn exceeds the second functional diameter 68, which exceeds the first-mentioned functional diameter 66. This results in an increase in the functional diameters 66, 68, 70, 72, starting from the bearing seat 56 in the direction of the center of the transmission input shaft 24, i. H. in the direction of the running surface 60 of the sealing element 42.
  • the fourth functional diameter 72 is not necessarily the absolutely largest diameter of the transmission input shaft 24; It just has to be larger than all the diameters on the transmission side.
  • the shaft sections of the transmission input shaft 24, which are arranged on the electric machine side, can also have larger diameters.
  • the preload can be set, for example, by a suitable selection of the shim 28 (cf. illustration according to FIG. 1).
  • a second X-arrangement 76 on the e-axis module 10 is provided by the cover-side bearing 30 on the one hand and the e-machine bearing 44 on the other. While the cover-side bearing 30 is also part of the first X-arrangement 74, the E-machine bearing 44, which is closed by the cover 20 of the E-axle module 10, is only part of the second X-arrangement 76. In the frame The second X-arrangement 76 is compensated for play by a wave spring 46 shown in FIG. 1, which acts on the E-machine bearing 44 in the axial direction.
  • FIGS. 1 to 4 an embodiment variant of the bearing arrangement 22 of an E-axis module 10 proposed according to the invention is described. This is used in the electric drive train of an electrically powered passenger car or an electrically powered commercial vehicle.
  • the parking lock gear 32 may be present as an option and be attached to the circumference of the transmission input shaft 24 by means of a material bond by means of a weld.
  • the bearing 30 on the cover side and the bearing 40 on the housing side can also be implemented as a fixed-loose bearing, with either the bearing 30 on the cover side or the bearing 40 on the housing side representing the fixed bearing of the fixed-loose bearing.
  • the floating bearing can also be represented by a spring element or a disk.
  • a ring can be inserted between the bearing seat 58 and the running surface 60 for the sealing element 42 in the form of a radial shaft sealing ring on the shaft shoulder. This can be supported on the inner ring of the housing-side bearing 40 and the shaft shoulder to the

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • General Details Of Gearings (AREA)

Abstract

L'invention se rapporte à un système de palier (22) d'un module d'essieu électrique (10) comprenant une machine électrique (12) et une boîte de vitesses (14) comportant un arbre d'entrée de boîte de vitesses (24) qui est monté en plusieurs points. Le système de palier (22) dans la boîte de vitesses (22) est conçu sous la forme d'un premier système en x (74) d'un palier monté sur un couvercle (30) et d'un palier monté sur un boîtier (40). L'arbre d'entrée de boîte de vitesses (24) présente des diamètres fonctionnels (66, 68, 70, 72) qui augmentent sensiblement à partir d'un siège de palier (56) du palier monté sur un couvercle (30) dans la direction du centre de l'arbre d'entrée de boîte de vitesses (24). L'invention se rapporte en outre à un module d'essieu électrique (10) comprenant un système de palier (22) destiné à être utilisé dans un véhicule électrique.
EP22718891.9A 2021-05-11 2022-03-28 Système de palier d'un module d'essieu électrique Pending EP4338264A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021204795.5A DE102021204795A1 (de) 2021-05-11 2021-05-11 Lageranordnung eines E-Achsen-Moduls
PCT/EP2022/058113 WO2022238041A1 (fr) 2021-05-11 2022-03-28 Système de palier d'un module d'essieu électrique

Publications (1)

Publication Number Publication Date
EP4338264A1 true EP4338264A1 (fr) 2024-03-20

Family

ID=81387339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22718891.9A Pending EP4338264A1 (fr) 2021-05-11 2022-03-28 Système de palier d'un module d'essieu électrique

Country Status (4)

Country Link
EP (1) EP4338264A1 (fr)
CN (1) CN117321891A (fr)
DE (1) DE102021204795A1 (fr)
WO (1) WO2022238041A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10350040A1 (de) 2003-10-27 2005-05-25 Robert Bosch Gmbh Getriebe-Antriebseinheit
DE102009051002A1 (de) * 2009-10-28 2011-05-05 Schaeffler Technologies Gmbh & Co. Kg Antriebseinheit für Kraftfahrzeuge mit einem Elektromotor
DE102010048131A1 (de) 2010-10-11 2012-04-12 Magna Powertrain Ag & Co. Kg Elektrische Antriebseinheit
DE102011080036A1 (de) * 2011-07-28 2013-01-31 Zf Friedrichshafen Ag Radnahe Antriebseinheit für ein Kraftfahrzeug
EP2846439B1 (fr) 2013-09-10 2020-12-02 Siemens Aktiengesellschaft Machine électrique dotée d'un arbre
DE102015217875A1 (de) * 2015-09-17 2017-03-23 Siemens Aktiengesellschaft Antriebssystem mit einer elektrischen Maschine und einem Getriebe
DE102018104685A1 (de) * 2018-03-01 2019-09-05 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Antriebsvorrichtung mit einem Elektromotor und einem Getriebe
WO2020164715A1 (fr) * 2019-02-14 2020-08-20 Gkn Automotive Ltd. Dispositif d'entraînement pourvu d'entraînement électrique et transmission
DE102019205105B3 (de) * 2019-04-10 2020-07-16 Zf Friedrichshafen Ag Elektrischer Achsantrieb und Verfahren zum Betreiben desselben

Also Published As

Publication number Publication date
WO2022238041A1 (fr) 2022-11-17
CN117321891A (zh) 2023-12-29
DE102021204795A1 (de) 2022-11-17

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