CN113316694A

CN113316694A - Transmission device

Info

Publication number: CN113316694A
Application number: CN202080011257.0A
Authority: CN
Inventors: M·施密特; J·哈贝尔; F·贝恩罗伊特; T·蒂特根; D·杜德克
Original assignee: GKN Automotive Ltd
Current assignee: GKN Automotive Ltd
Priority date: 2019-01-28
Filing date: 2020-01-27
Publication date: 2021-08-27
Anticipated expiration: 2040-01-27
Also published as: DE102019102078B3; CN113316694B; WO2020157004A1

Abstract

The invention relates to a transmission arrangement comprising: a housing arrangement (3); a first transmission stage (6) having a first gearwheel (9) which is rotatably drivable about a first axis of rotation (B) and has a first intermediate plane (E1); and a second transmission stage (13) having a second gearwheel (15) which is rotatably drivable about a second axis of rotation (C) and has a second intermediate plane (E2), wherein the first and second transmission stages (6, 13) are drivingly connected to one another and the first and second gearwheels (9, 15) have opposite directions of rotation; a separation element (28) axially arranged between said first and second intermediate planes (E1, E2); and a lubricating oil which defines a lubricating oil rest level (L1) in a stationary state, wherein a lubricating oil guiding geometry (21) is arranged in an axially overlapping manner with the second gearwheel (15) and is configured such that the lubricating oil thrown out by the second gearwheel (15) is guided in the direction of the first mid-plane (E1) when the transmission device is in operation.

Description

Transmission device

Technical Field

The invention relates to a transmission device for a motor vehicle, in particular for an electric drive.

Background

In recent years, for example due to legislation, transmission devices for motor vehicles have been put under increasing demands with regard to their efficiency. In addition, the transmission device must be able to be used in the increasingly smaller installation space of motor vehicles, so that it has an increasingly compact design. Both of these aspects make adequate lubrication of the components in the transmission device difficult.

DE 112013007520T 5 discloses a transmission device for a motor vehicle, comprising: a first gear and a second gear in driving connection with each other; a lubricant filling mechanism, which defines a lubricant level in a static installation state of the transmission device; a first reservoir arranged above the lubricant level and fillable with lubricant when the transmission device is driven by rotation of the first gear; a second reservoir, which is arranged above the lubricant level and can be filled with lubricant when the transmission device is driven by the rotation of the second gear. The reservoirs are defined by housing parts and cover elements.

A transmission device with a lower lubricant reservoir and two upper lubricant reservoirs is known from WO 2007/013642 a 1. The upper lubricant reservoir is supplied with lubricant by means of splashed oil from two counter-rotating gears of the transmission device, which are immersed in a common oil sump of the lower lubricant reservoir. The lubricant flows by gravity from the upper lubricant reservoir to the different bearing points of the transmission device.

DE 102015013973 a1 discloses a lubricating oil device for a gear unit. The lubricating oil device includes: a housing having a sidewall; a reduction gear connected to the output shaft; and a catch container for receiving a portion of the lubricating oil carried by the reduction gear. An oil passage for guiding the lubricating oil carried by the reduction gear to the catch container is configured in the side wall. Furthermore, ribs extending in the radial direction are provided on the side walls, which ribs serve to guide the entrained lubricant. Grooves are provided on the end edges of the fins in connection with the lubricant supply object.

Disclosure of Invention

The object of the present invention is to provide a transmission device having improved thermal operating characteristics.

In order to solve this task, a transmission device, in particular for an electric drive, is proposed, comprising: a housing means; a first transmission stage with a first gear which is rotatably drivable about a first axis of rotation by a pinion of the first transmission stage and has a first intermediate plane; and a second transmission stage with a second gear which is rotatably drivable by a pinion of the second transmission stage about a second axis of rotation parallel to the first axis of rotation and has a second intermediate plane, wherein the first transmission stage and the second transmission stage are received in the housing arrangement and are in driving connection with one another, and the first gear has an opposite direction of rotation with respect to the second gear; a separation element axially arranged between the first and second intermediate planes; and a lubricating oil which is provided in the housing arrangement and which defines a lubricating oil rest level in a stationary state, wherein a lubricating oil guiding geometry is arranged in an axially overlapping manner with the second gear and is configured such that the lubricating oil thrown off by the second gear when the transmission arrangement is in operation is guided in the direction of the first mid-plane. The lubricant guide geometry can be arranged in particular in the installed position of the transmission device below a plane spanned by the first and second axes of rotation.

The transmission device according to the invention has the advantage that the thrown-off lubricating oil of the second gear is guided by the lubricating oil guiding geometry in the axial direction to the first intermediate plane or into the active region of the first gear. The active region can be, for example, a collecting region for the lubricant, in which the first gearwheel is in contact with the lubricant and entrains the lubricant during the rotational movement, so that the lubricant is conveyed further upward from the active region by the first gearwheel. Thus, the two counter-rotating first and second gears cause multi-stage lubricant delivery. The delivery stage is formed by the second gear wheel, which delivers lubricant to the lubricant guiding geometry when rotating. The lubricant is guided by the lubricant guide geometry from the axial overlap region of the second gearwheel in the direction of the first intermediate plane or in the effective region of the first gearwheel. Here, the lubricant is carried by the first counter-rotating gear wheel, which forms the further conveying stage. The splash oil of the second gearwheel is reduced or prevented from impinging on the body of the first gearwheel counter to the direction of rotation of the first gearwheel by means of a separating element arranged axially between the first and second intermediate planes. The oil guide geometry diverts or guides the lubricant from the splash region of the second gearwheel to the active region of the first gearwheel, by means of which a targeted fluid connection is formed between the two gearwheels. The lubricating oil which is conveyed by the second gearwheel in the second direction of rotation and is conveyed to the first gearwheel by the lubricating oil guiding geometry and is conveyed further by the first gearwheel in the first direction of rotation is conveyed in a continuous flow movement. It is therefore not necessary to first decelerate by the first gear wheel in order to then accelerate in the opposite circumferential direction. In this way, the splash losses of the first gear are reduced. In addition, this way of guiding the lubricating oil from the second gear stage to the first gear stage ensures that the gear meshes of the first and second transmission stages are supplied with lubricating oil in a targeted, permanent and efficient manner.

The intermediate planes shall mean planes perpendicular to the rotational axes of the respective gears, which planes are defined by the midpoints of axial overlap of the elements of the respective transmission stage. The intermediate plane E1 is thus defined by the middle point of the axial overlap of the first gear wheel and the pinion of the first transmission stage and extends perpendicularly to the first rotational axis. In contrast, the intermediate plane E2 is defined by the center point of the axial overlap of the second gear wheel and the pinion of the second transmission stage and extends perpendicularly to the second axis of rotation.

For example, the transmission device can be used in a drive train of a motor vehicle for transmitting a driving force from a drive source to an axle. The drive source can be, for example, an electric motor, wherein other drive sources, for example, combustion motors, are also possible.

The operation of the transmission device shall mean a rotation of an element of the transmission device in a preferential direction of rotation. The preferential direction of rotation generally corresponds to forward travel of the vehicle. However, depending on the design of the lubricating system of the transmission device, it can also be considered that the preferential direction corresponds to the reversing of the vehicle.

In one possible embodiment, in the installed position of the transmission device, the lubricant guide geometry can be arranged below a plane spanned by the first axis of rotation and the second axis of rotation.

Furthermore, the lubricant guiding geometry can be designed in such a way that the lubricant thrown off by the second gear is guided through the opening of the separating element in the direction of the first center plane. In particular, the openings of the lubricant guide geometry and the openings of the separating element can be arranged in a radially overlapping manner. Alternatively, it is conceivable that the lubricant guiding geometry is designed such that the thrown-off lubricant of the second gearwheel is guided to the first intermediate plane next to the separating element.

In a further possible embodiment, the first gearwheel can be arranged at least partially in a first lubricating oil collecting section of the housing device and the second gearwheel can be arranged at least partially in a second lubricating oil collecting section of the housing device. In particular, the first gear wheel can be immersed in an oil groove which can be formed in the first lubricating oil collecting section and the second gear wheel can be immersed in an oil groove which can be formed in the second lubricating oil collecting section. The first and second lubricating oil collecting sections can be defined at least in part by a separating element. The first lubricating oil collecting section is in particular located above the second lubricating oil collecting section in the installed position of the transmission. The second gear is capable of conveying the lubricating oil from the second collecting section up to the lubricating oil guiding geometry, which in turn guides the lubricating oil to the first lubricating oil collecting section. From here the first gear wheel can continue to feed lubricant upwards in the opposite direction of rotation. In this regard, the first and second lube collecting sections are fluidly interconnected by a lube guiding geometry. In the installed position of the transmission device, the first lubricating oil collecting section can be arranged above a lubricating oil rest level.

The transmission device can comprise a lubricating oil distribution device, wherein the first gear wheel conveys lubricating oil from the first lubricating oil collecting section into the lubricating oil distribution device when the transmission device is in operation, and the lubricating oil distribution device comprises in particular at least one outlet which leads lubricating oil trapped in the lubricating oil distribution device to bearings and/or tooth meshes of the transmission device. The lubricating oil distribution device can comprise a distributor element which distributes the flow of the captured lubricating oil in such a way that the outlet opening connected to the element to be lubricated of the transmission device is supplied with lubricating oil in a predetermined ratio.

The transmission device can comprise a lubricating oil reservoir which, in the installed position of the transmission device, is arranged above the first lubricating oil collecting section, wherein the first gear wheel conveys lubricating oil from the first lubricating oil collecting section into the lubricating oil reservoir when the transmission device is in operation. The lubricating oil reservoir can be arranged at least partially in an axially overlapping manner with the lubricating oil reservoir.

The lubricating oil reservoir is capable of storing the thrown-out lubricating oil to a defined volume. When the volume exceeds a defined value, the lubricating oil can be returned via the overflow area into the oil sump and/or can flow from the lubricating oil reservoir via the outlet to the elements of the transmission device that must be lubricated.

The lubricating oil reservoir can have an overflow region which, in the installed position of the transmission device, is arranged above, in particular vertically above, the inner convection surface of the housing device. Within the scope of the present invention, the term "convection surface" shall mean an inwardly directed surface of the outer wall of the housing arrangement, through which the lubricating oil can flow into the bottom region of the transmission arrangement, in particular into the oil sump. Therefore, the convection surface can also be referred to as a heat absorption surface. The convection surface can be arranged at least partially above the lubrication oil rest level.

The housing device can comprise a lubrication plenum at least partially disposed in a lower section of the housing device. As a lubricating oil calming chamber, it shall be meant each chamber in the housing arrangement in which splashed oil can be collected and stabilized before being conveyed to the second lubricating oil collecting section. The lubricant plenum can be connected to the second lubricant collecting section via an opening, which is designed in particular as a throttle valve, in order to supply lubricant to the second lubricant collecting section or the second gear wheel in a constant, defined amount and in a defined direction in a reference operating point. The lubrication plenum can be at least partially defined by a convection surface of the housing arrangement.

The transmission device can have an insert element connected to the housing device, which insert element comprises at least one of the lubricating oil reservoir, the lubricating oil distribution device and the separating element.

Drawings

Preferred embodiments are explained below with the aid of the figures. Here:

fig. 1a shows a first perspective view of a drive device with a transmission device according to the invention;

fig. 1b shows a second perspective view of the drive device of fig. 1 a;

fig. 2 shows an exploded view of the drive device of fig. 1;

fig. 3 shows a perspective view of a transmission device of the drive device of fig. 1 in a first partial section;

fig. 4 shows a perspective view of a transmission device of the drive device of fig. 1 in a second partial section;

FIG. 5 shows a perspective view of a motor housing of the transmission device of the drive of FIG. 1 with a depicted resting level of lubricating oil;

fig. 6 shows a perspective view of a transmission housing of a transmission device of the drive device of fig. 1;

fig. 7 shows a perspective view of the drive device of fig. 1 in a view from the transmission side in the direction of the motor side, in a section along a parting line of the housing arrangement, wherein the lubricating oil level formed in a reference operating point of the drive device is depicted;

fig. 8 shows a perspective view of the drive device of fig. 1 in a view from the motor side in the direction of the transmission side, in a section along a parting line of the housing arrangement, wherein the lubricating oil levels formed in the reference operating points of the drive device are depicted;

fig. 9 shows a first detailed perspective view of an embedded element of the drive device of fig. 1;

fig. 10 shows a second detailed perspective view of the embedded element of the drive device of fig. 1;

FIG. 11 shows a perspective view similar to FIG. 9 with elements of first and second transmission stages of the transmission arrangement of the drive arrangement of FIG. 1, with gears of the first transmission stage shown in an axially staggered manner for the sake of clarity;

fig. 12 shows a transmission device of the drive device of fig. 1 in a sectional view along the axis of rotation of the intermediate shaft;

FIG. 13 shows a cross-sectional view of FIG. 12 in perspective; and is

Fig. 14 shows a partial section through the transmission device of the drive of fig. 1 along the axis of rotation of the input shaft. .

Detailed Description

Fig. 1 to 14, which are described jointly below, show an electric drive 1 with a transmission device 2 according to the invention for a motor vehicle. It goes without saying that the use of the transmission device 2 shown here in an electric drive is merely an exemplary possibility, wherein other drive devices, for example combustion motors, are also possible.

As can be seen in particular in fig. 2 to 8, the transmission arrangement comprises a housing arrangement 3, in which a first transmission stage 6 and a second transmission stage 13, which is in drive connection therewith, are arranged. The first transmission stage 6 comprises in a first gear plane a pinion 8 and a first gear 9. The second transmission stage 13 comprises a second pinion 14 and a second gear 15 in a second gear plane. The first gear wheel 9 is rotatably drivable about a first axis of rotation B and the second gear wheel 15 is rotatably drivable about a second axis of rotation a parallel to the first axis of rotation, wherein the two

gear wheels

9, 15 have opposite directions of rotation. Between the two gear planes, a separating element 28 is arranged in order to keep the lubricant splashed around in the respective gear plane or to prevent splashing towards the respectively adjacent gear when the gears rotate. A lubricant guiding geometry 21 is provided in axial overlap with the second gearwheel 15, which guides lubricant thrown off by the second gearwheel 15 during rotation of the gearwheel in the direction of the first gearwheel 9 or the first gearwheel plane.

The housing arrangement 3 comprises in particular a first housing part 4 and a second housing part 5. The first housing part 4 receives the electric motor 36 from one side and can therefore also be referred to as a motor housing. The electric motor 36 is connected via a cable harness 39 to a control unit 38 for controlling the electric drive 1. On the opposite side, the motor housing 4 is connected to the second housing part 5 by means of a connecting element, so that a transmission chamber is formed, in which the transmission device 2, the differential 16 and the insert element 25 are accommodated. The second housing part 5 can therefore also be referred to as a transmission housing.

The second transmission stage 13 follows the first transmission stage 6 in the power path from the electric motor 36 to the differential 16. In other words, no further transmission stage is arranged between the first transmission stage 6 and the second transmission stage 13. The pinion 8 of the first transmission stage 6 is connected to, in particular integrally formed in, the input shaft 7, which is supported about the axis of rotation a by a bearing 10 in the transmission housing 5 and a bearing 10' in the motor housing 4. The input shaft 7 is connected to a motor shaft 37 of an electric motor 36 in a rotationally fixed manner. The pinion 8 meshes with a first gear wheel 9 of the first transmission stage 6 on a countershaft 11. The intermediate shaft 11 is supported about the axis of rotation B by bearings 12 in the transmission housing 5 and by bearings 12' in the motor housing 4. Furthermore, the countershaft 11 has a pinion 14 of the second transmission stage 13, which meshes with a second gear 15 of the second transmission stage 13 in the form of a toothed ring. The second gearwheel 15 is connected, for example welded or screwed, to an annular housing section of a differential 16. The differential 16 is supported about the axis of rotation C by bearings 17 in the transmission housing 5 and by bearings 17' in the motor housing 4. The power transmitted by the second gearwheel 15 can be distributed to the two output shafts 40, 40' in a manner sufficiently well known by means of the differential 16.

The rotational axes A, B and C are in the present case arranged parallel to one another and thus together define an axial extension of the drive device 1 or the transmission device 2. The plane defined by the connection of the rotation axis a and the rotation axis C divides the housing arrangement 3 into a lower housing section and an upper housing section.

The first transmission stage 6 has a first center plane E1 and the second transmission stage 13 has a second center plane E2. The intermediate plane is to be understood as a plane which extends perpendicularly to the axial direction of the transmission device 2 and is defined by the center point of the axial overlap of the elements of the respective transmission stage. In the present case, the intermediate planes E1 and E2 are determined by the center point of the axial overlap of the first gear wheel 9 and the pinion 8 of the first transmission stage 6 or the center point of the axial overlap of the second gear wheel 15 and the pinion 14 of the second transmission stage 13. The intermediate plane can also be referred to as a gear plane.

In the housing means 2, lubricating oil is received in a predefined amount, constituting a lubricating oil rest level L1. When all the lubricating oil accumulates in the bottom region of the housing arrangement 3, as shown in fig. 5, the lubricating oil rest level L1 is present here in the installed position of the drive 1 in a stationary state. The lubricating oil standstill level L1 can be selected in such a way that at least some of the components of the transmission device 2, in particular the bearings 10, 10 'of the input shaft 7, the pinion 8 of the first transmission stage 6, the second gearwheel 15 of the second transmission stage 13 and the bearings 17, 17' of the differential 16, are immersed in the lubricating oil sump formed in this way, which has the lubricating oil standstill level L1. In the previously described plateau state, the lubricating oil level L2 of the lubricating oil plateau chamber 34 described below is the same as the lubricating oil rest level L1.

The insert element 25 is arranged in the upper housing section with a position element 41, which engages in a corresponding receiving region of the housing device 3. The insert element 25 has a distribution section 26 and an overflow section 27, which can trap and store splash oil of the transmission unit, which can also be referred to as thrown oil, when the transmission device 2 is in operation. The overflow section 27 can also be referred to as a lubricating oil reservoir. The distribution section 26 and the overflow section 27 have a common collection area 45, which collects splashed oil from the first gearwheel 9 of the first transmission stage 6 when the transmission device 2 is operated in a preferential direction of rotation, i.e. normally when the vehicle is traveling in the forward direction. In special cases, the preferred direction of rotation can also be defined when the vehicle is reversing. Said collection area 45 is arranged in an axially overlapping manner with the first gear wheel 9.

Starting from the collection region 45, the lubricating oil conducted into the distribution section 26 is conducted to the transmission-side outlet 31 and the motor-side outlet 31'. The outlet openings 31, 31' can be connected to suitable oil-guiding elements which, in a known manner, guide the lubricating oil to the points to be lubricated in the transmission device 2, such as bearings and tooth meshes, for example oil-guiding plates or oil-guiding bores in the housing device 3. The flow of lubricating oil can be distributed at the outlets 31, 31' according to requirements by means of a distributor element 43 in the distribution section 26. Furthermore, a lubricating oil level L3 can be established in the distribution portion 26 before the lubricating oil overflows from the distribution portion 26. Thus, a maximum amount of lubricating oil that can be received by the distribution section 26 is defined. The lubricating oil level L3 is here arranged above the lubricating oil rest level L1.

Furthermore, the distribution section 26 has a scraper 42. When the transmission device 2 is operated counter to the preferred direction of rotation, i.e., usually in reverse drive mode, the lubricating oil received by the second gearwheel 15 of the second transmission stage 13 is scraped off and thus enters the distribution section 26. The distributor element 43 can be designed in such a way that the scraped-off lubricant is distributed and guided to the outlets 31, 31' according to the respective requirements.

Furthermore, a portion of the lubricating oil which is trapped in the trapping region 45 is guided into the overflow section 27 and is collected there. The overflow section 27 is bowl-shaped and has an overflow area in the form of an overflow edge 32. The vertically upwardly directed rim area of the overflow section 27, which is arranged vertically at the lowest level, is defined as the overflow rim 32. In this way, a lubricating oil level L4 can be established in the overflow section 27 until the collected lubricating oil overflows via the overflow edge 32. Thereby, a maximum amount of lubrication oil that can be received through the overflow section 27 is defined. The lubricating oil level L4 is here arranged vertically above the lubricating oil rest level L1. As an alternative, the overflow area can be designed as an opening in the overflow section 27. The lube oil level L4 is then defined by the vertical lowest point of the opening.

The insert element 25 surrounds a partial region of the circumference of the second gearwheel 15 with a distribution section 26. The insert element 25 surrounds the first gear wheel 9 with a collection area 45 and a part of the overflow section 27. In particular, the intermediate shaft 11 and the motor-side bearing 10' receiving the input shaft 7 are thereby shielded from splash oil of the first transmission stage 6 and the second transmission stage 13. In order to nevertheless ensure a sufficient supply of the bearing 10 'with lubricating oil, the overflow section 27 furthermore comprises an outlet 31 ″ through which lubricating oil is conducted to the bearings 10, 10' of the input shaft 7, as shown in fig. 14.

Furthermore, the insert element 25 comprises a separating element 28, which is arranged in the axial direction between the center plane E1 of the first transmission stage 6 and the center plane E2 of the second transmission stage 13. It is of course also conceivable for the separating element 28 to be produced as a separate component. In the present case, the separating element 28 has an annular section with a central bore 29, through which the intermediate shaft 11 passes. The annular ring-shaped section is arranged in an axially overlapping manner with the first gear wheel 9 of the first transmission stage 6. The outer diameter of the circular ring-shaped section is greater than the tip circle diameter of the first gear 9. The separating element 28 has a connecting opening 30 in the region of the annular ring section, which connects the first lubricating oil collecting section 18 of the transmission device 2 to the second lubricating oil collecting section 23 of the transmission device 2. It is also conceivable that, instead of the connecting bore 30, the separating element 28 has a split, which in particular corresponds to a ring segment. Furthermore, in the present case, the separating element 28 forms a wall of the collecting section 26 and a wall of the overflow section 27 of the insert element 25.

The first gear wheel 9 of the first transmission stage 6 is arranged in a first lubricating oil collecting region 18 of the transmission chamber. The first lubricating oil collecting section 18 is defined here on the side facing away from the motor by a pot-shaped limiting section 19 of the transmission housing 5. On the motor side, the first lubricating oil collecting section 18 is defined by a separating element 28 of the insert element 25. The outer contour of the separating element 28 follows in a partial region the limiting section 19 of the transmission housing 5. Furthermore, it is conceivable to arrange a sealing element between the separating element 28 and the intermediate shaft 11 on the one hand and between the separating element 28 and the limiting section 19 of the transmission housing 5 on the other hand.

The second gear wheel 15 of the second transmission stage 13 is arranged in a second lubricating oil collecting section 23 of the transmission chamber. The second gear wheel 15 rotates in the opposite rotational direction with respect to the first gear wheel 9 of the first transmission stage 6. The second lubricating oil collecting section 23 is delimited by a wall section 24 of the transmission housing 5 on the side facing away from the motor 36. On the motor side, the second lubricating oil collecting section 23 is delimited by a wall 46 of the motor housing 4. The motor housing 4 has an oil guiding rib 20 which surrounds the second gear 15 in a partial region in the circumferential direction. In this case, the partial region extends from the vertically deepest point of the second gearwheel 15 in the installation position of the drive 1 in the direction of the preferred direction of rotation by an amount of up to 120 °, in particular by an amount of up to 90 °. The oil guiding rib 20 forms, together with the outer contour and the wall 46 of the motor housing 4, a pot-shaped section which surrounds approximately three quarters of the second gear 15. In the assembled state, the oil guiding rib 20 together with the fixing rib 44 furthermore fixes the insert element 25 in the region of the separating element 28 in the axial direction between the motor housing 4 and the transmission housing 5.

The transmission device 2 has a lubricant guiding geometry which is arranged in an axially overlapping manner with the second gearwheel 15 and is designed such that, during operation of the transmission device 2, the lubricant thrown off by the second gearwheel 15 is guided in the direction of a first intermediate plane E1.

In the present case, the lubricant oil guiding geometry comprises a catch groove 21, which is formed by the oil guiding rib 20 together with a catch rib 22 of the motor housing 4 and is arranged in an axially overlapping manner with the second gearwheel 15 of the second transmission stage 13. The catch groove 21 can be arranged in the housing chamber below a plane spanned by the axis of rotation B of the intermediate shaft 11 and the axis of rotation C of the differential 16. The catch groove 21 is axially oriented and widens in the radial direction from the motor side in the direction of the separating element 28 along the width of the second gear 15. The catching groove 21 and the connecting bore 30 of the separating element 28 are arranged in a radially overlapping manner with respect to one another and directly adjoin one another. When the second gear 15 rotates in the preferential direction of rotation corresponding to forward travel in the present case as shown by the arrow X1 in fig. 7, the lubricating oil is carried away from the bottom of the second lubricating-oil collecting section 23 by the second gear 15 and is pushed toward the catch tank 21. By means of the shape of the catch groove 21, the lubricating oil is deflected in the axial direction from the motor side and is conveyed into the first lubricating oil collecting section 18 through the connecting bore 30 of the separating element 28 in the direction of the first intermediate plane E1. The corresponding lubricant movement is illustrated by the arrows in fig. 7 and 8.

It is also conceivable for the lubricant guide geometry to be formed at least partially by a separate structural element, by the separating element 28 or by any combination of a separate structural element, separating element 28 and housing arrangement 3.

As already described above, the lubricating oil is conducted from the first lubricating oil collecting section 18 via the catch sump 21 into the active region of the first gearwheel 9 of the first transmission stage 6, so that the injected lubricating oil is conveyed from the lower housing section of the transmission device 2, in particular from the bottom region, into the insert element 25 in a rapid and simple manner during operation of the transmission device 2. Thereby, the splash loss caused by the second gear 15 can be significantly reduced. At the same time, this two-stage guidance of the lubricating oil ensures that the gear meshes of the first transmission stage 6 and of the transmission stage 13 are both supplied with lubricating oil in a targeted, permanent and efficient manner.

In addition, the splashed oil of the second transmission stage 13 is conveyed axially by the lubricating oil guide geometry 21 to the first gearwheel 9 of the first transmission stage 6. In this way, in comparison to a transmission device 2 without such a separating element 28 between the first lubricating oil collecting portion 18 and the second lubricating oil collecting portion 23, splashed oil of the second transmission stage 13 striking the first gear wheel 9 of the first transmission stage 6 counter to the direction of rotation of the first gear wheel 9 is reduced or prevented. Therefore, the splashed oil does not have to be first decelerated by the first gear 9 to thereafter accelerate the splashed oil in the opposite direction corresponding to the rotation direction of the first gear 9. The spattering losses caused by the first gear wheel 9 are thereby reduced. In this case, it can be considered in particular that the splash oil is deflected by the lubricant guide geometry 21 in such a way that it is conveyed in the circumferential direction in the direction of rotation to the first gearwheel 9 of the first transmission stage 6.

The overflow edge 32 of the overflow section 27 of the insert element 25 is arranged above a heat absorption surface 33 of the housing arrangement 3 oriented into the transmission chamber. The heat absorbing surface 33 in the present case comprises part of the surfaces of the motor housing 4 and the transmission housing 5. The heat absorption surface 33 has a first section 33' which is arranged in an obliquely extending manner below the overflow edge 32. The second section 33 ″ extends from the first section 33' in the direction of the bottom of the housing device 3 with a slight inclination. The third section 33 "' connects said second section 33" with the bottom of the housing means 3. If the level of the trapped lubricating oil in said overflow section 27 exceeds the level L4 of the overflow edge 32, the lubricating oil flows from the overflow section 27 onto the first section 33' of the heat absorbing surface 33. The lubricant continues to flow along the second section 33 ' ' and the third section 33 ' ' ' by gravity. This enables the lubricating oil to output its thermal energy to the wall of the casing device 3, and high cooling of the lubricating oil can be achieved. For this purpose, the outer wall of the housing device 3 can be designed in the region of the heat absorption surface 33 in such a way that thermal energy is effectively dissipated to the surroundings.

The heat absorbing surface 33 defines, in particular together with the oil guiding ribs 20, a lubricating oil calming chamber 34 in which lubricating oil that overflows from the overflow sections 27 of the embedded element 25 after flowing along the heat absorbing surface 33 is collected. The lubricating oil plenum 34 is connected to the second lubricating oil collecting section 23 via a slit 35 in the oil guiding rib 20. In this case, the break 35 can be designed as a throttle, via which the lubricating oil is supplied to the second gearwheel 15 of the second transmission stage 13 in a defined amount and in a less turbulent state. This in turn reduces the splash losses of the second gear 15.

The size of the cut-out 35 makes it possible to set the quantity of lubricant which accumulates in the lubricant plenum 34 such that a lubricant level L1 'is formed in the second lubricant collecting section 23 and a lubricant level L2' is formed in the lubricant plenum 34 in a reference operating point, in particular in the nominal operation of the drive 1. In particular, it is contemplated that a portion of the lubricating oil which is injected into the housing arrangement 3 in the reference operating point is stored in the insert element 25, wherein a lubricating oil level L3 is formed in the distribution section 26 and a lubricating oil level L4 is formed in the overflow section 27. In the present case, approximately 30% of the initially injected lubricating oil quantity in the reference operating point accumulates in the second lubricating oil collecting section 23, whereas up to 70% of the initially injected lubricating oil quantity accumulates in the embedded element 25 and the lubricating oil calming chamber 34.

List of reference numerals

1 drive device

2 Transmission device

3 casing device

4 Motor casing

5 Transmission housing

6 first Transmission stage

7 input shaft

8 pinion

9 Gear

10. 10' bearing

11 intermediate shaft

12. 12' bearing

13 second transmission stage

14 pinion

15 toothed ring

16 differential mechanism

17. 17' bearing

18 first lube oil collection section

19 restriction section

20 oil guiding fin

21 catch groove, lubricating oil guide geometry

22 catching rib

23 second lube oil collection section

24 wall segment

25 Embedded component

26 distribution section

27 overflow section, lube reservoir

28 separating element

29 opening

30 connecting hole

31. 31 ', 31 ' ' outlet

32 overflow edge

33. 33 ', 33' ″ heat absorption surface

34 smoothing chamber

35 gap

36 motor

37 motor shaft

38 control unit

39 cable harness

40. 40' output shaft

41 position element

42 scraper

43 Dispenser

44 fixed fin

45 collection area

46 wall

A. B, C axis of rotation

E plane

L level

X is the preferred direction of rotation.

Claims

1. Transmission device, in particular for an electric drive, comprising:

a housing arrangement (3);

a first transmission stage (6) having a first gearwheel (9) which can be driven in rotation about a first axis of rotation (B) by a pinion (8) of the first transmission stage (6) and which has a first intermediate plane (E1);

and a second transmission stage (13) with a second gearwheel (15) which is rotatably drivable by a pinion (14) of the second transmission stage (13) about a second axis of rotation (C) parallel to the first axis of rotation (B) and has a second middle plane (E2);

wherein the first transmission stage (6) and the second transmission stage (13) are received in the housing arrangement (3) and are in driving connection with each other and wherein the first gear wheel (9) has an opposite rotational direction with respect to the second gear wheel (15);

a separation element (28) axially arranged between said first intermediate plane (E1) and said second intermediate plane (E2);

-a lubricating oil which is provided in the housing arrangement (3) and which defines a lubricating oil rest level (L1) in a stationary state;

characterized by a lubricant guide geometry (21) which in the installed position of the transmission device lies below a plane spanned by the first axis of rotation (B) and the second axis of rotation (C), wherein the lubricant guide geometry (21) is arranged in an axially overlapping manner with the second gearwheel (15) and is designed for guiding lubricant thrown off by the second gearwheel (15) in the direction of the first middle plane (E1) when the transmission device is in operation.

2. A transmission arrangement according to claim 1,

it is characterized in that the preparation method is characterized in that,

the lubricant guiding geometry (21) is designed to guide lubricant thrown off by the second gearwheel (15) into the active region of the first gearwheel (9), from where it can be conveyed further from the first gearwheel (9).

3. A transmission arrangement according to any one of claims 1 or 2,

it is characterized in that the preparation method is characterized in that,

the lubricant guiding geometry (21) is designed in such a way that the lubricant thrown off by the second gearwheel (15) is guided through the opening (30) of the separating element (28) in the direction of the first middle plane (E1).

4. A transmission arrangement according to any one of claims 1 to 3,

it is characterized in that the preparation method is characterized in that,

the first gearwheel (9) is arranged in a first lubricating oil collecting section (18) of the housing device (3) and the second gearwheel (15) is arranged in a second lubricating oil collecting section (23) of the housing device (3).

5. A transmission arrangement according to claim 4,

it is characterized in that the preparation method is characterized in that,

the first and second lubrication oil collection sections (18, 23) are at least partially delimited by the separation element (28).

6. A variator arrangement according to any one of claims 4 or 5,

it is characterized in that the preparation method is characterized in that,

the first and second lubrication oil collection sections (18, 23) are connected to each other by the lubrication oil guiding geometry (21).

7. A transmission arrangement according to any one of claims 4 to 6,

it is characterized in that the preparation method is characterized in that,

the first lubricating oil collecting section (18) is arranged above the lubricating oil rest level (L1) in the mounted position of the transmission device.

8. A transmission arrangement according to any one of claims 4 to 7,

it is characterized in that

A lubricating oil reservoir (27) which is arranged above the first lubricating oil collecting section (18) in the mounted position of the transmission device,

wherein the first gearwheel (9) conveys lubricating oil from the first lubricating oil collecting section (18) into a lubricating oil reservoir (27) when the transmission device is in operation.

9. A transmission arrangement according to any one of claims 4 to 8,

it is characterized in that

A lubricating oil distribution device (26),

wherein the first gear wheel (9) conveys lubricating oil from the first lubricating oil collecting section (18) into the lubricating oil distribution device (26) when the transmission device is in operation.

10. A transmission arrangement according to claim 9,

it is characterized in that the preparation method is characterized in that,

the lubricant distribution device (26) comprises at least one outlet (31, 31') leading lubricant trapped in the lubricant distribution device (26) to bearings and/or tooth engagement portions of the transmission device.

11. A transmission arrangement according to claim 9 or 10,

it is characterized in that the preparation method is characterized in that,

the transmission device comprises an insert element (25) connected to the housing device (3), the insert element comprising at least one of the lubricating oil reservoir (27), the lubricating oil distribution device (26) and a separating element (28).

12. A transmission arrangement according to any one of claims 8 to 11,

it is characterized in that the preparation method is characterized in that,

the lubricant reservoir (27) has an overflow region (32) which, in the installed position of the transmission device, is arranged above an internal convection surface (33) of the housing device (3), wherein the convection surface (33) is arranged at least partially above the lubricant rest level (L1).

13. A transmission arrangement according to any one of claims 1 to 12,

it is characterized in that

A lubricating oil plenum (34) of the housing device (3), which is arranged at least partially in a lower section of the housing device (3).

14. A transmission arrangement as claimed in claim 13,

it is characterized in that the preparation method is characterized in that,

the lubricating oil plenum (34) is connected to the second lubricating oil collecting section (23) via an opening (35).

15. A transmission arrangement according to claim 13 or 14,

it is characterized in that the preparation method is characterized in that,

the lubrication plenum (34) is at least partially defined by a convection surface (33) of the housing arrangement (3).