CN113316694B

CN113316694B - Transmission device

Info

Publication number: CN113316694B
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 Driveline International GmbH
Current assignee: GKN Driveline International GmbH
Priority date: 2019-01-28
Filing date: 2020-01-27
Publication date: 2024-07-12
Anticipated expiration: 2040-01-27
Also published as: CN113316694A; DE102019102078B3; WO2020157004A1

Abstract

The present invention relates to a transmission device comprising: a housing means (3); a first transmission stage (6) having a first gearwheel (9) which is driven in a rotatable manner about a first axis of rotation (B) and has a first intermediate plane (E1); and a second transmission stage (13) with a second gearwheel (15) which is rotationally 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 rotational directions; -a separation element (28) axially arranged between said first and second intermediate planes (E1, E2); and lubricating oil, which in a stationary state defines a lubricating oil rest level (L1), wherein a lubricating oil guiding geometry (21) is arranged in an axially overlapping manner with the second gearwheel (15) and is configured such that, when the transmission device is in operation, lubricating oil thrown out by the second gearwheel (15) is guided in the direction of the first intermediate plane (E1).

Description

Transmission device

Technical Field

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

Background

In recent years, for example, due to regulations, there have been increasing demands on transmission devices for motor vehicles with respect to their efficiency. In addition, the transmission device must be able to be used within the area of the increasingly smaller installation space of the motor vehicle, so that it has an increasingly compact design. Both of these aspects make it difficult to adequately lubricate the components in the transmission device.

DE 11 2013 007 520 T5 discloses a transmission device for a motor vehicle, comprising: a first gear and a second gear drivingly connected to each other; a lubricant filling mechanism that defines a lubricant level in a static installed 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 arranged above the lubricant level and being fillable with lubricant when the transmission device is driven by rotation of the second gear. The reservoirs are defined here by a housing part and a cover element.

A transmission device having a lower lubricant reservoir and two upper lubricant reservoirs is known from WO 2007/013442 A1. The upper lubricant reservoir is supplied with lubricant by splash oil from two counter-rotating gears of the transmission device immersed in a common oil sump of the lower lubricant reservoir. Lubricant flows from the upper lubricant reservoir to the different bearing points of the transmission device due to gravity.

A lubricating oil device for a reduction gear is known from DE 10 2015 013 973 A1. 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 tank is constructed in the side wall. Furthermore, ribs extending in the radial direction are provided on the side walls for guiding the carried lubricating oil. Grooves in connection with the lubricant supply object are provided on the end edges of the ribs.

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 wheel 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 wheel, which is rotatably drivable by a pinion wheel 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 wheel has an opposite rotational direction with respect to the second gear wheel; a separation element axially disposed between the first intermediate plane and the second intermediate plane; and a lubricating oil which is arranged 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 gearwheel and is configured such that the lubricating oil thrown off by the second gearwheel is guided in the direction of the first intermediate plane when the transmission arrangement is in operation. The lubricating oil guide geometry can be arranged in particular below a plane which is spanned by the first and second rotational axes in the installed position of the transmission device.

The transmission device according to the invention has the advantage that the thrown-out lubricant oil of the second gearwheel is guided in this way in the axial direction via a lubricant oil guiding geometry to the first intermediate plane or into the active area of the first gearwheel. The effective region can be, for example, a collecting section for the lubricant, in which the first gearwheel is in contact with the lubricant and carries the lubricant during the rotational movement, so that the lubricant is conveyed further up from the effective region by the first gearwheel. Thus, the two counter-rotating first and second gears cause multiple stages of lubricant delivery. The delivery stage is formed by the second gear which, when rotated, delivers lubricant to the lubricant guide geometry. The lubricant is guided by the lubricant guiding geometry from the axially overlapping region of the second gearwheel in the direction of the first intermediate plane or in the direction of the effective region of the first gearwheel. Here, the lubricant is carried by a counter-rotating first gear wheel, which forms a further conveying stage. The splash oil of the second gear is reduced or prevented from impinging on the wheel body of the first gear counter to the direction of rotation of the first gear by a separating element arranged axially between the first and second intermediate planes. The lubricant guiding geometry diverts or guides lubricant from the splash zone of the second gear to the active zone of the first gear, by means of which a targeted fluid connection is formed between the two gears. The lubricant oil fed by the second gear wheel in the second rotational direction and fed to the first gear wheel by the lubricant oil guiding geometry and fed further by the first gear wheel in the first rotational direction is fed in a continuous flow movement. It is therefore not necessary to first slow down by the first gear in order to then accelerate in the opposite circumferential direction. In this way the splash losses of the first gear are reduced. Furthermore, by means of this two-stage guiding of the lubricating oil from the second gear to the first gear, a targeted, durable and efficient supply of lubricating oil to the gear meshes of both the first and second transmission stages can be ensured.

Intermediate planes shall mean planes perpendicular to the rotational axis of the respective gear wheel, which planes are defined by the midpoints of axial overlap of the elements of the respective transmission stage. The first intermediate plane E1 is thereby defined by the midpoint of the axial overlap of the first gear wheel and pinion of the first transmission stage and extends perpendicularly to the first axis of rotation. Correspondingly, the second intermediate plane E2 is defined by the midpoint of the axial overlap of the second gear wheel and 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 powertrain of a motor vehicle for transmitting driving force from a driving source to an axle. The drive source can be, for example, an electric motor, wherein other drive sources, such as combustion motors, are also possible.

Operation of the transmission device shall mean rotation of an element of the transmission device in a preferential direction of rotation. The preferential rotation direction generally corresponds to the forward travel of the vehicle. However, depending on the design of the lubrication system of the transmission device, it is also conceivable that the preferential direction corresponds to the reverse of the vehicle.

In one possible embodiment, in the installed position of the transmission device, the lubrication oil guiding geometry can be arranged below a plane that is spanned by the first and second rotation axes.

Furthermore, the lubricant guide geometry can be configured such that the lubricant thrown off by the second gearwheel is guided through the opening of the separating element in the direction of the first intermediate plane. In particular, the openings of the lubricating oil guide geometry and the openings of the separating element can be arranged in a radially overlapping manner. As an alternative, it is conceivable for the lubricant guide geometry to be configured such that the thrown-out lubricant of the second gearwheel is guided to the first intermediate plane beside the separating element.

In another possible embodiment, the first gear can be arranged at least partially in a first lubrication oil collecting section of the housing arrangement, and the second gear can be arranged at least partially in a second lubrication oil collecting section of the housing arrangement. In particular, the first gearwheel can be immersed in an oil sump which can be formed in the first lubricating oil collecting section and the second gearwheel can be immersed in an oil sump which can be formed in the second lubricating oil collecting section. The first and second lubricant collection sections can be defined at least in part by a separating element. The first lubricating oil collecting section is located in the installed position of the transmission, in particular above the second lubricating oil collecting section. The second gear is capable of transporting lubrication oil from the second collection section up to a lubrication oil guide geometry that in turn directs lubrication oil to the first lubrication oil collection section. From here the first gear can continue to deliver lubricant upwards in the opposite rotational direction. In this regard, the first and second lube oil collection sections are fluidly interconnected by a lube oil guiding geometry. In the installed position of the transmission device, the first lubricating oil collecting section can be arranged above a lubricating oil resting level.

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

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

The lubricant reservoir is capable of storing the thrown out lubricant to a defined volume. The lubricating oil can be guided back into the oil sump via the overflow area and/or can flow from the lubricating oil reservoir via the outlet to the components of the transmission device that have to be lubricated if the defined volume is exceeded.

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

The housing means can comprise a lubrication plateau chamber arranged at least partially in a lower section of the housing means. As lubricating oil calming chamber, it should be understood that each chamber in the housing means in which splashed oil can be collected and smoothed before being fed to the second lubricating oil collecting section. The lubricating oil smoothing chamber can be connected to the second lubricating oil collecting section for this purpose via an opening, which is in particular designed as a throttle valve, so that the lubricating oil is fed to the second lubricating oil collecting section or the second gear wheel in a constant, defined amount and in a defined direction in the reference operating point. The lube spacer chamber can be defined at least in part by a convection surface of the housing means.

The transmission device can have an embedded element connected with the housing device, the embedded element comprising at least one of the lubricating oil reservoir, the lubricating oil dispensing device and the dividing 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 cross-section;

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

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

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 section along a separation line of the housing device, from the perspective of the transmission side in the direction of the motor side, wherein the lubricating oil level formed in a reference operating point of the drive device is shown;

Fig. 8 shows a perspective view of the drive device of fig. 1, viewed in a direction from the motor side toward the transmission side, in a section along a separation line of the housing device, wherein the lubricating oil level formed in a reference operating point of the drive device is depicted;

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

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

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

FIG. 12 shows a transmission device of the drive device of FIG. 1 in a cross-sectional view along the rotational axis of the intermediate shaft;

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

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

Detailed Description

Fig. 1 to 14, which are described in conjunction 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 only 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 device comprises a housing device 3 in which a first transmission stage 6 and a second transmission stage 13 connected in drive therewith are arranged. The first transmission stage 6 comprises a pinion 8 and a first gear 9 in a first gear plane. 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 can be driven rotationally about a first rotational axis B and the second gear wheel 15 can be driven rotationally about a second rotational axis a parallel to the first rotational axis, wherein the two gear wheels 9, 15 have opposite rotational directions. A separating element 28 is arranged between the two gear planes in order to keep lubricant splashed around in the respective gear plane or to prevent splashing towards the respective adjacent gear when the gear rotates. In axial overlap with the second gear 15, a lubricant guide geometry 21 is provided, which guides the lubricant thrown out by the second gear 15 during rotation of the gears in the direction of the first gear 9 or the first gear 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 bundle 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 thus also be referred to as a transmission housing.

The second transmission stage 13 immediately 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 with, an input shaft 7 which is supported about the rotational axis 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 the electric motor 36 in a rotationally fixed manner. The pinion 8 meshes with a first gearwheel 9 of the first transmission stage 6 on an intermediate shaft 11. The intermediate shaft 11 is supported about the axis of rotation B by a bearing 12 in the transmission housing 5 and by a bearing 12' in the motor housing 4. The intermediate shaft 11 furthermore has a pinion 14 of the second transmission stage 13, which meshes with a second gearwheel 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 the differential 16. The differential 16 is supported about the rotation axis C by a bearing 17 in the transmission housing 5 and by a bearing 17' in the motor housing 4. The power transmitted by the second gear 15 can be distributed to the two output shafts 40, 40' by means of the differential 16 in a manner known per se.

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 intermediate plane E1 and the second transmission stage 13 has a second intermediate plane E2. The middle plane shall mean a plane extending perpendicular to the axial direction of the transmission device 2, which is defined by the midpoints of the axial overlap of the elements of the respective transmission stage. In the present case, the first intermediate plane E1 is determined by the midpoint of the axial overlap of the first gearwheel 9 and the pinion 8 of the first transmission stage 6 and the second intermediate plane E2 is determined by the midpoint of the axial overlap of the second gearwheel 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, thus constituting a lubricating oil resting 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 resting level L1 here occurs in a stationary state in the installed position of the drive arrangement 1. The lubricating oil rest level L1 can be selected such that at least a part 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 gear 15 of the second transmission stage 13 and the bearings 17, 17' of the differential 16, are immersed in the lubricating oil groove thus formed having the lubricating oil rest level L1. In the steady state described above, the lubricating oil level L2 of the lubricating oil steady chamber 34 described below is the same as the lubricating oil resting level L1.

The insert element 25 is arranged in the upper housing section with a position element 41 which engages into a corresponding receiving region of the housing arrangement 3. The insert element 25 has a distribution section 26 and an overflow section 27, which, when the transmission device 2 is in operation, can each capture and store splashed oil of the transmission unit, which can also be referred to as thrown-off oil. The overflow section 27 can also be referred to as a lubricant reservoir. The distribution section 26 and the overflow section 27 have a common collecting region 45, which collects splash oil from the first gearwheel 9 of the first transmission stage 6 when the transmission device 2 is operated in the preferential rotational direction, i.e. typically when the vehicle is travelling forward. In special cases, the preferential rotation direction can also be defined when the vehicle is reversing. The trapping region 45 is arranged in an axially overlapping manner with the first gearwheel 9.

From the collecting region 45, the lubricating oil guided into the distribution section 26 is guided to the transmission-side outlet 31 and the motor-side outlet 31'. The outlets 31, 31' can be connected to suitable oil guiding elements which in a known manner guide the lubricating oil to the parts of the transmission device 2 to be lubricated, such as bearings and tooth engagement, for example oil guiding plates or oil guiding holes in the housing device 3. The lubricating oil flow can be distributed at the outlets 31, 31' on demand by means of distributor elements 43 in the distribution section 26. Furthermore, a lubricant level L3 can be established in the distribution section 26 before lubricant escapes from the distribution section 26. Thus, a maximum amount of lubricating oil that can be received by the dispensing section 26 is defined. The lubricating oil level L3 is arranged here above the lubricating oil resting level L1.

Furthermore, the dispensing section 26 has a scraper 42. When the transmission device 2 is operated counter to the preferential rotation direction, i.e. normally in reverse, 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 lubricating oil is distributed and guided to the outlets 31, 31' according to the respective requirements.

Furthermore, a portion of the lubricating oil trapped in the trapping region 45 is guided into the overflow section 27 and collected there. The overflow section 27 is embodied in the form of a bowl and has an overflow area in the form of an overflow lip 32. The vertically upwardly directed edge region of the overflow section 27 is defined as an overflow edge 32, which is arranged vertically at the lowest level. In this way, a lubricant level L4 can be established in the overflow section 27 until the collected lubricant overflows via the overflow edge 32. Thereby, a maximum amount of lubricating oil that can be received by said relief section 27 is defined. The lubricating oil level L4 is here arranged vertically above the lubricating oil rest level L1. Alternatively, the overflow region can be configured as an opening in the overflow section 27. Then, the lubricating oil level L4 is 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 gearwheel 9 with a trapping region 45 and a part of the overflow section 27. In particular, the intermediate shaft 11 and the motor-side bearing 10' which receives the input shaft 7 are thereby shielded from splash oil relative to the first transmission stage 6 and the second transmission stage 13. In order to nevertheless ensure a sufficient supply of lubricating oil to the bearings 10', the relief section 27 furthermore comprises an outlet 31″ through which the lubricating oil is guided 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 first intermediate plane E1 of the first transmission stage 6 and the second intermediate 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 section is arranged in an axially overlapping manner with the first gearwheel 9 of the first transmission stage 6. The outer diameter of the annular section is greater than the tip circle diameter of the first gearwheel 9. The separating element 28 has a connecting opening 30 in the region of the annular section, which connects the first lubricating oil collecting section 18 of the transmission device 2 with the second lubricating oil collecting section 23 of the transmission device 2. Instead of the connecting openings 30, it is also conceivable for the separating element 28 to have a split, which in particular corresponds to a ring segment. Furthermore, in the present case, the separating element 28 forms the wall of the collecting section 26 and 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 section 18 of the transmission chamber. The first lubricating oil collection 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 the limiting section 19 of the transmission housing 5 in a partial region. It is also 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 lubrication oil collecting section 23 of the transmission chamber. The second gearwheel 15 rotates in the opposite rotational direction relative to the first gearwheel 9 of the first transmission stage 6. The second lubricating oil collecting section 23 is delimited on the side facing away from the motor 36 by a wall section 24 of the transmission housing 5. On the motor side, the second lubricating oil collecting section 23 is defined by a wall 46 of the motor housing 4. The motor housing 4 has oil guiding ribs 20 which surround the second gearwheel 15 in the circumferential direction in a partial region. In this case, the partial region extends in the direction of the preferential direction of rotation, starting from the vertically deepest point of the second gearwheel 15, by an extent of up to 120 °, in particular by an extent of up to 90 °, in the installed position of the drive 1. 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 encloses approximately three-quarters of the second gearwheel 15. Furthermore, in the assembled state, the oil guide rib 20, together with the fixing rib 44, fixes the insert element 25 in the region of the separating element 28 between the motor housing 4 and the transmission housing 5 in the axial direction.

The transmission device 2 has a lubricant guide 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, lubricant which is thrown off by the second gearwheel 15 is guided in the direction of the first intermediate plane E1.

In the present case, the lubricant guide geometry comprises a catch groove 21, which is formed by the oil guide 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 tank 21 can be arranged in the housing chamber below a plane which is spanned by the rotational axis B of the intermediate shaft 11 and the rotational axis C of the differential 16. The catch groove 21 is oriented axially and widens in the radial direction from the motor side along the width of the second gearwheel 15 in the direction of the separating element 28. The collecting channel 21 and the connecting hole 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 rotation direction corresponding to forward running in the present case as shown by arrow X1 in fig. 7, the lubricating oil is carried away from the bottom of the second lubricating oil collecting section 23 through the second gear 15 and pushed toward the catch tank 21. By virtue of the shape of the collecting trough 21, the lubricating oil is deflected in the axial direction from the motor side and is fed 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 in fig. 7 and 8 by arrows.

It is also conceivable that the lubricant guide geometry is formed at least in part by individual structural elements, by the separating element 28 or by any combination of individual structural elements, separating element 28 and housing arrangement 3.

As already described above, the lubricating oil is guided from the first lubricating oil collecting section 18 via the catch groove 21 into the active area of the first gear wheel 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 area, into the insert element 25 in a rapid and simple manner when the transmission device 2 is in operation. Thereby, the splash loss caused by the second gear 15 can be significantly reduced. At the same time, this two-stage lubrication can ensure a targeted, long-lasting and efficient supply of lubrication oil to the gear meshes of the first transmission stage 6 and the transmission stage 13.

In addition, splash oil from the second transmission stage 13 is fed axially to the first gearwheel 9 of the first transmission stage 6 via the lubricating oil guide geometry 21. This reduces or prevents splash oil from the second transmission stage 13 from striking the first gearwheel 9 of the first transmission stage 6 counter to the direction of rotation of the first gearwheel 9, in comparison to a transmission device 2 without such a separating element 28 between the first and second lubricating oil collecting sections 18, 23. Therefore, the splashed oil does not have to be first decelerated by the first gear 9, so that the splashed oil is thereafter accelerated in the opposite direction in correspondence with the rotation direction of the first gear 9. Thereby reducing splash losses caused by the first gear 9. In particular, it is also possible to filter the splash oil by means of the lubricating oil guide geometry 21 in such a way that the splash oil is fed in the circumferential direction in the rotational direction 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-absorbing surface 33 of the housing arrangement 3, which surface is oriented into the transmission chamber. The heat absorbing surface 33 comprises in the present case part of the surfaces of the motor housing 4 and the transmission housing 5. The heat absorbing surface 33 has a first section 33' which is arranged obliquely below the overflow edge 32. The second section 33″ extends from the first section 33' with a slight inclination in the direction of the bottom of the housing arrangement 3. A third section 33' "connects said second section 33" with the bottom of the housing means 3. If the level of trapped lubricant in the overflow section 27 exceeds the level L4 of the overflow edge 32, lubricant flows from the overflow section 27 onto the first section 33' of the heat absorbing surface 33. The lubricating oil continues to flow along the second section 33″ and the third section 33' "by gravity. This allows the lubricating oil to output its heat energy to the wall of the housing device 3, and thus allows high cooling of the lubricating oil. For this purpose, the outer wall of the housing arrangement 3 can be formed in the region of the heat absorbing surface 33 in such a way that heat energy is effectively output to the surroundings.

The heat-absorbing surface 33 defines, in particular together with the oil guiding ribs 20, a lubricant oil calming chamber 34 in which lubricant oil which overflows from the overflow section 27 of the embedded element 25 after the lubricant oil has flowed along the heat-absorbing surface 33 is collected. The lubricating oil calming chamber 34 is connected to the second lubricating oil collecting section 23 via a split 35 in the oil guiding rib 20. The split 35 can be embodied here as a throttle valve, by means of which the lubricant is fed 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 loss of the second gear 15.

By means of the size of the gap 35, it is possible to adjust how much lubricant accumulates in the lubricant calming chamber 34, so that in a reference operating point, in particular in the nominal operation of the drive 1, a lubricant level L1 'is established in the second lubricant collecting section 23 and a lubricant level L2' is established in the lubricant calming chamber 34. In particular, it is considered here that a part of the lubricating oil 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 amount of lubricant initially injected in the reference operating point accumulates in the second lubricant collecting section 23, while up to 70% of the amount of lubricant initially injected accumulates in the embedded element 25 and the lubricant calming chamber 34.

List of reference numerals

1. Driving device

2. Transmission device

3. Housing arrangement

4. Motor shell

5. Transmission case

6. First transmission stage

7. Input shaft

8. Pinion gear

9. Gear wheel

10. 10' Bearing

11. Intermediate shaft

12. 12' Bearing

13. Second transmission stage

14. Pinion gear

15. Toothed ring

16. Differential mechanism

17. 17' Bearing

18. First lubricating oil collecting section

19. Restriction section

20. Oil guiding rib

21. Trapping groove and lubricating oil guiding geometry

22. Trapping rib

23. Second lubricating oil collecting section

24. Wall section

25. Embedded component

26. Distribution section

27. Overflow section, lubricating oil reservoir

28. Separating element

29. An opening

30. Connecting hole

31. 31', 31 "Outlets

32. Overflow edge

33. 33', 33", 33'" Heat absorbing surface

34. Smooth room

35. Breach of the mouth

36. Motor with a motor housing

37. Motor shaft

38. Control unit

39. Cable bundle

40. 40' Output shaft

41. Position element

42. Scraping device

43. Dispenser

44. Fixing rib

45. Trapping region

46. Wall with a wall body

A. B, C axis of rotation

E plane

L level

X prioritizes the direction of rotation.

Claims

1. A transmission device comprising:

A housing means (3);

a first transmission stage (6) with a first gearwheel (9) which is drivable rotationally about a first axis of rotation (B) by a pinion (8) of the first transmission stage (6) and has a first intermediate plane (E1), which first intermediate plane (E1) is defined by the midpoint of the axial overlap of the first gearwheel and the pinion of the first transmission stage and extends perpendicularly to the first axis of rotation;

And a second transmission stage (13) with a second gearwheel (15) which can be driven rotationally about a second axis of rotation (C) parallel to the first axis of rotation (B) by a pinion (14) of the second transmission stage (13) and has a second intermediate plane (E2), which is defined by the midpoint of the axial overlap of the second gearwheel and the pinion of the second transmission stage and extends perpendicularly to the second axis of rotation;

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 (9) has an opposite rotational direction with respect to the second gear (15);

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

-a lubricating oil provided in said housing means (3) and defining a lubricating oil resting level (L1) in a steady state;

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

2. The transmission device according to claim 1,

It is characterized in that the method comprises the steps of,

The lubricant guiding geometry (21) is designed to guide the lubricant thrown out by the second gearwheel (15) into the effective area of the first gearwheel (9), from where the lubricant from the first gearwheel (9) can be transported further.

3. The transmission device according to claim 1 or 2,

It is characterized in that the method comprises the steps of,

The lubricant guiding geometry (21) is configured such that 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 intermediate plane (E1).

4. The transmission device according to claim 1 or 2,

It is characterized in that the method comprises the steps of,

The first gearwheel (9) is arranged in a first lubricant collecting section (18) of the housing arrangement (3) and the second gearwheel (15) is arranged in a second lubricant collecting section (23) of the housing arrangement (3).

5. The transmission device according to claim 4,

It is characterized in that the method comprises the steps of,

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

6. The transmission device according to claim 4,

It is characterized in that the method comprises the steps of,

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

7. The transmission device according to claim 4,

It is characterized in that the method comprises the steps of,

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

8. The transmission device according to claim 4,

It is characterized in that

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

Wherein the first gear wheel (9) transfers lubricant from the first lubricant collecting section (18) into the lubricant reservoir (27) when the transmission device is in operation.

9. The transmission device according to claim 8,

It is characterized in that

A lubricant distribution device (26),

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

10. The transmission device according to claim 9,

It is characterized in that the method comprises the steps of,

The lubrication oil distribution device (26) comprises at least one outlet (31, 31') which leads the lubrication oil trapped in the lubrication oil distribution device (26) to the bearings and/or tooth engagement of the transmission device.

11. The transmission device according to claim 9 or 10,

It is characterized in that the method comprises the steps of,

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

12. The transmission device according to any one of claims 8 to 10,

It is characterized in that the method comprises the steps of,

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

13. The transmission device according to claim 4,

It is characterized in that

-A lubrication oil calming chamber (34) of the housing arrangement (3) arranged at least partially in a lower section of the housing arrangement (3).

14. The transmission device of claim 13,

It is characterized in that the method comprises the steps of,

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

15. The transmission device according to claim 13 or 14,

It is characterized in that the method comprises the steps of,

The lubricating oil calming chamber (34) is at least partially delimited by a convection surface (33) of the housing arrangement (3).

16. The transmission device according to claim 1,

It is characterized in that the method comprises the steps of,

The transmission device is for an electric drive.