WO2020157004A1

WO2020157004A1 - Transmission assembly

Info

Publication number: WO2020157004A1
Application number: PCT/EP2020/051925
Authority: WO
Inventors: Mark Schmidt; Jürgen Haber; Frank BERNREUTHER; Torsten Tietgen; Damian DUDEK
Original assignee: Gkn Automotive Limited
Priority date: 2019-01-28
Filing date: 2020-01-27
Publication date: 2020-08-06
Also published as: CN113316694B; CN113316694A; DE102019102078B3

Abstract

The invention relates to a transmission assembly comprising: a housing assembly (3); a first transmission stage (6) having a first wheel (9), which can be driven in rotation about a first rotational axis (B) and has a first mid-plane (E1), and a second transmission stage (13) having a second wheel (15), which can be driven in rotation about a second rotational axis (C) and has a second mid-plane (E2), wherein the first and second transmission stage (6, 13) are interconnected for being driven, and the first and second wheel (9, 15) have opposed directions of rotation; a separating element (28), which is arranged axially between the first and second mid-plane (E1, E2); and lubricating oil which, in the quiescent state, defines a lubricating oil quiescent level (L1); wherein a lubricating oil guide geometry (21) is arranged so as to axially overlap the second wheel (15) and is configured in such a way that, during operation of the transmission assembly, lubricating oil thrown off the second wheel (15) is conveyed towards the first mid-plane (E1).

Description

Gear arrangement

description

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

In recent years, transmission arrangements for motor vehicles have been subject to ever increasing demands with regard to their efficiency, for example due to legal regulation. In addition, the gear arrangements must be usable in increasingly small installation spaces of motor vehicles, so that they have increasingly compact architectures. Both aspects make adequate lubrication of the components in the gear arrangement difficult.

From DE 1 1 2013 007 520 T5 a gear arrangement for a motor vehicle is known, comprising: a first gear and a second gear, which are connected to each other at the drive; a lubricant filling, which stood in a static Installation to the gear arrangement defines a lubricant level; a first reservoir, which is arranged above the level of lubricant and can be filled with lubricant when driving the gear arrangement by rotating the first gear, a second reservoir, which is arranged above the level of lubricant and when driving the gear arrangement by rotating the second gear with lubricant is fillable. The reservoirs are limited by a housing part and a cover element.

From WO 2007/013642 A1 a gear arrangement with a lower lubricant reservoir and two upper lubricant reservoirs is known. The upper lubricating Medium stores are supplied with lubricant by the spray oil from two counter-rotating wheels of a gear arrangement, which are immersed in a common oil sump of the lower lubricant store. Due to the force of gravity, the lubricant flows from the upper lubricant stores to various bearing points of the gear arrangement.

A lubricating oil structure for a speed reducer is known from DE 10 2015 013 973 A1. The lubricating oil assembly includes a housing with a side wall, a reduction gear that is connected to an output shaft, and a collecting container for receiving a portion of a lubricating oil that is entrained by the reduction gear. An oil passage for guiding the lubricating oil entrained by the reduction wheel to the collecting container is formed in the side wall. Furthermore, a rib extending in the radial direction is provided on the side wall for guiding the entrained lubricating oil. A groove is provided on an end edge of the rib which is connected to a lubricating oil supply object.

The object of the present invention is to propose a gear arrangement which has an improved thermal operating behavior.

To achieve the object, a gear arrangement, in particular for an electric drive, is proposed, comprising: a housing arrangement; a first gear stage with a first wheel which can be driven by a pinion of the first gear stage to rotate about a first axis of rotation and has a first center plane; and a second gear stage with a second wheel which can be driven by a pinion of the second gear stage to rotate about a second axis of rotation parallel to the first axis of rotation and has a second center plane, the first gear stage and the second gear stage being accommodated in the housing arrangement and being drive-connected to one another and the first wheel to the second wheel has an opposite direction of rotation; a separator disposed axially between the first center plane and the second center plane; and lubricating oil, which is provided in the housing arrangement and defines a lubricating oil resting level in the calm state, wherein a lubricating oil guide geometry is arranged in axial overlap with the second wheel and is designed such that when the transmission arrangement is in operation from second wheel thrown lubricating oil is directed towards the first center plane. In the installed position of the gear arrangement, the lubricating oil guide geometry can be arranged in particular below the plane that is spanned by the first axis of rotation and the second axis of rotation.

The gear arrangement according to the invention has the advantage that the lubricating oil of the second wheel flung off is guided via the lubricating oil guide geometry in the axial direction to the first central plane or into an effective area of the first wheel. The effective area can, for example, be a collecting section for the lubricant, in which the first wheel comes into contact with the lubricant and takes it with it when it rotates, so that the lubricant is conveyed further upward from the effective area by the first wheel. The two counter-rotating first and second wheels thus effect a multi-stage delivery of lubricant. A delivery stage is formed by the second wheel which, when rotating, delivers lubricant to the lubricating oil guide geometry. From the lubricating oil guide geometry, the lubricant is guided from an axial overlap area of the second wheel in the direction of the first center plane or the effective area of the first wheel. Here the lubricant is carried along by the counter-rotating first wheel, which forms a further delivery stage. The separating element arranged axially between the first central plane and the second central plane reduces or prevents the splash oil of the second wheel from striking the wheel body of the first wheel against the direction of rotation of the first wheel. The lubricating oil guide geometry, which redirects or directs the lubricant from the spray area of the second wheel to the effective area of the first wheel, forms a targeted fluidic connection between the two wheels. The lubricating oil conveyed by the second wheel in the second direction of rotation and supplied to the first wheel via the lubricating oil guide geometry and further conveyed by the latter in the first direction of rotation is conveyed in a continuous flow movement. It therefore does not have to be braked by the first wheel in order to then be accelerated in the opposite circumferential direction. In this way, the splashing losses of the first wheel are reduced. In addition, this two-stage guidance of the lubricating oil, from the second wheel to the first wheel, can ensure that the tooth engagements of the first gear stage and the second gear stage both be supplied with lubricating oil in a targeted, permanent and efficient manner.

The center plane should be understood to mean the planes perpendicular to the axis of rotation of the respective wheel, which are defined by the center of the axial overlap of the elements of the respective gear stage. The center plane E1 is thus defined by the center point of the axial overlap of the first wheel and the pinion of the first gear stage and is perpendicular to the first axis of rotation. The center plane E2 is accordingly defined by the center of the axial overlap of the second wheel and the pinion of the second gear stage and extends perpendicular to the second axis of rotation.

The transmission arrangement can, for example, be used in a drive train of a motor vehicle to transmit a drive force from a drive source to a vehicle axle. The drive source can be, for example, an electrical machine, other drive sources such as an internal combustion engine also being possible.

Operation of the gear arrangement should be understood to mean the rotation of the elements of the gear arrangement in a preferred direction of rotation. The preferred direction of rotation usually corresponds to a forward drive of a vehicle. Depending on the configuration of the lubrication system of the transmission arrangement, it is also conceivable that the direction of travel corresponds to a backward travel of a vehicle.

In one possible embodiment, in the installed position of the transmission arrangement, the lubricating oil guide geometry can be arranged below a plane that is spanned by the first axis of rotation and the second axis of rotation.

The lubricating oil guide geometry can also be configured such that the lubricating oil thrown off the second wheel is guided through an opening of the separating element in the direction of the first center plane. In particular, the Mün extension of the lubricating oil guide geometry and the opening of the separating element can be arranged in a radial overlap. Alternatively, it is conceivable that the lubricating oil guidance geometry is configured such that the lubricating oil thrown off the second Rades past the separating element to the first center plane.

In a further possible embodiment, the first wheel can be arranged at least partially in a first lubricating oil collecting section of the housing arrangement and the second wheel can be arranged at least partially in a second lubricating oil collecting section of the housing arrangement. In particular, the first wheel can be immersed in an oil sump that can form in the first lubricating oil collecting section and the second wheel in an oil sump that can form in the second lubricating oil collecting section. The first lubricating oil collecting section and the second lubricating oil collecting section can be at least partially limited by the separating element. The first lubricating oil collecting section is in the installed position of the transmission, in particular above half of the second lubricating oil collecting section. The second wheel can deliver lubricating oil from the second collection section up to the lubricating oil guide geometry that directs the lubricating oil to the first lubricating oil collecting section. From here, the first wheel can further advance the lubricant in the opposite direction of rotation. Insofar, the first and the second lubricating oil collecting section are fluidly connected to one another via the lubricating oil guide geometry. In the installed position of the gearbox arrangement, the first lubricating oil collecting section can be arranged above the lubricating oil resting level.

The gear arrangement can comprise a lubricating oil distribution arrangement, wherein when the transmission arrangement is operating, the first wheel conveys lubricating oil from the first lubricating oil collecting section into the lubricating oil distribution arrangement and the lubricating oil distribution arrangement comprises in particular at least one outlet which stores lubricating oil captured in the lubricating oil distribution arrangement and / or toothing interventions of the transmission arrangement directs. The lubricating oil distribution assembly may include a distributor element that divides the flow of the collected lubricating oil such that outlets that are connected to elements of the transmission assembly to be lubricated are supplied with lubricating oil in a predetermined ratio.

The gear arrangement can comprise a lubricating oil reservoir, which is arranged above the first lubricating oil collecting section in the installed position of the gear arrangement, wherein when the transmission arrangement is operating, the first wheel conveys lubricating oil from the first lubricating oil collecting section into the lubricating oil reservoir. For this purpose, the lubricating oil reservoir can be arranged at least partially in axial overlap with the lubricating oil reservoir.

The lubricating oil reservoir can store the thrown off lubricating oil up to a defined volume. When the defined volume is exceeded, lubricating oil can be returned to the oil sump via overflow areas and / or flow from the lubricating oil reservoir via outlets to elements of the gear arrangement which have to be lubricated.

The lubricating oil reservoir can have an overflow area which, in the installed position of the gear arrangement, is arranged above, in particular vertically above, an internal convection surface of the housing arrangement. In the context of this invention, a convection surface is to be understood as an inward surface of an outer wall of the housing arrangement, via which lubricating oil can flow into the bottom area of the gear arrangement, in particular into an oil sump. The convection surface can therefore also be referred to as the heat absorption surface. The convection surface can be arranged at least partially above the lubricating oil resting level.

The housing arrangement can comprise a lubricating oil calming chamber which is at least partially arranged in a lower section of the housing arrangement. As a lubricating oil calming chamber, each chamber should be understood in the housing arrangement, in which spray oil can be collected and calmed down before it is supplied to the second lubricating oil collecting section. For this purpose, the lubricating oil calming chamber can be connected via an opening to the second lubricating oil collecting section, which is designed in particular as a throttle, so that in a reference operating point, lubricating oil is supplied to the second lubricating oil collecting section or the second wheel in a constant, defined amount and in a defined direction. The lubricating oil calming chamber can be at least partially limited by the convection surface of the housing arrangement. The gear arrangement can have an insert element connected to the housing arrangement, which comprises at least one of the lubricating oil reservoir, the lubricating oil distribution arrangement and the separating element. Preferred embodiments are explained below with reference to the drawing figures. It shows

Figure 1 a shows a first perspective view of a drive arrangement with an inventive transmission arrangement;

1b shows a second perspective view of the drive arrangement from FIG. 1a;

FIG. 2 shows an exploded view of the drive arrangement from FIG. 1; FIG. 3 shows a perspective view of the gear arrangement of the drive arrangement from FIG. 1 in a first partial section;

FIG. 4 shows a perspective view of the gear arrangement of the drive arrangement from FIG. 1 in a second partial section;

FIG. 5 shows a perspective view of the motor housing of the gear arrangement of the drive arrangement from FIG. 1 with the lubricating oil spike shown; FIG. 6 is a perspective view of the gear housing of the gear arrangement of the drive arrangement from FIG. 1;

Figure 7 is a perspective view of the drive assembly of Figure 1 in a

Section plane along the dividing line of the housing arrangement with a viewing direction from the transmission side towards the motor side, lubricating oil levels being drawn in which form at a reference operating point of the drive arrangement; FIG. 8 shows a perspective view of the drive arrangement from FIG. 1 in a sectional plane along the dividing line of the housing arrangement with a view from the engine side towards the transmission side, lubricating oil levels being shown which form at a reference operating point of the drive arrangement;

FIG. 9 shows a first perspective detailed view of the insert element of the drive arrangement from FIG. 1; FIG. 10 shows a second perspective detailed view of the insert element of the drive arrangement from FIG. 1;

Figure 1 1 is a perspective view analogous to Figure 9 with the elements of the first and second gear stage of the gear arrangement of the drive arrangement from Figure 1, the wheel of the first gear stage being shown axially offset for the sake of clarity;

FIG. 12 shows the gear arrangement of the drive arrangement from FIG. 1 in a sectional illustration along the axis of rotation of the intermediate shaft;

FIG. 13 shows the sectional illustration from FIG. 12 in a perspective view; and

FIG. 14 shows a partial section of the gear arrangement of the drive arrangement from FIG. 1 along the axis of rotation of the input shaft.

FIGS. 1 to 14, which are described jointly below, show an electric drive arrangement 1 with a transmission arrangement 2 according to the invention for a motor vehicle. It goes without saying that the use of the gear arrangement 2 shown here in an electric drive is only an exemplary possibility, wherein other drives, such as an internal combustion engine, are also possible. As can be seen in particular in FIGS. 2 to 8, the gear arrangement comprises a housing arrangement 3, in which a first gear stage 6 and a second gear stage 13 connected to the drive are arranged. The first gear stage 6 comprises a pinion 8 and a first wheel 9 in a first gear plane. The second gear stage 13 comprises a second pinion 14 and a second gear 15 in a second gear plane. The first gear 9 rotates about a first axis of rotation B. can be driven, and the second wheel 15 can be driven in rotation about a second axis of rotation A parallel thereto, the two wheels 9, 15 having opposite directions of rotation. A separating element 28 is arranged between the two wheel planes in order to keep lubricant splashing around in the respective wheel plane when the wheels rotate, or to prevent splashing to the respectively adjacent wheel. In axial coverage with the second wheel 15, a lubricating oil guide geometry 21 is provided which, when the wheels rotate, directs lubricating oil thrown off the second wheel 15 in the direction of the first wheel 9 or the first wheel plane.

The housing arrangement 3 includes in particular a first housing part 4 and a second housing part 5. The first housing part 4 receives an 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 wire harness 39 to a control unit 38 which serves to control the electric drive arrangement 1. On the opposite side, the motor housing 4 is connected to the second housing part 5 by means of connecting elements, so that a gear space is formed in which the gear arrangement 2, a differential 16 and an insert element 25 are accommodated. The second Ge housing part 5 can thus also be referred to as a gear housing.

The second gear stage 13 follows in the power path from the electric motor 36 to the differential 16 immediately after the first gear stage 6. In other words, no further gear stage is arranged between the first gear stage 6 and the second gear stage 13. The pinion 8 of the first gear stage 6 is connected to an input shaft 7, in particular integrated in one piece, which is supported by a bearing 10 in the gear housing 5 and a bearing 10 'in the motor housing 4 about an axis of rotation A. The input shaft 7 is rotatably connected to a motor shaft 37 of the electric motor 36. The pinion 8 meshes with the first wheel 9 of the first Gear stage 6, which sits on an intermediate shaft 1 1. The intermediate shaft 11 is mounted with a bearing 12 in the gear housing 5 and with a bearing 12 'in the motor housing 4 about an axis of rotation B. The intermediate shaft 1 1 also has a pinion 14 of the second gear stage 13, which with a second wheel 15 of the second Ge gear stage 13 in the form of a ring gear is engaged. The second wheel 15 is connected to an annular housing section of the differential 16, for example welded or screwed. The differential 16 is mounted with a bearing 17 in the Ge gear housing 5 and with a bearing 17 'in the motor housing 4 about an axis of rotation C. Through the differential 16, the power transmitted by the second wheel 15 can be distributed to two output shafts 40, 40 'in a well-known manner.

The axes of rotation A, B and C are arranged parallel to each other in the present case and thus jointly define an axial extent of the drive arrangement 1 or the transmission arrangement 2. The plane which is defined by the connection of the axis of rotation A with the axis of rotation C divides the housing arrangement 3 into a lower housing section and an upper housing section.

The first gear stage 6 has a first center plane E1 and the second gear stage 13 has a second center plane E2. As the center plane, the planes are to be understood as perpendicular to the axial extent of the gear arrangement 2, which are defined by the center of the axial overlap of the elements of the respective gear stage. In the present case, the center planes E1 and E2 are determined by the center point of the axial overlap of the first wheel 9 and the pinion 8 of the first gear stage 6 or the second wheel 15 and the pinion 14 of the second gear stage 13. The middle planes can also be called wheel planes.

Lubricating oil is taken up in a predefined amount in the housing arrangement 2, so that a lubricating oil resting level L1 is formed. The lubricating oil idle level L1 is set in an installed position of the drive arrangement 1 in a calm state when the entire lubricating oil accumulates in the bottom area of the housing arrangement 3, as shown in FIG. 5. The lubricating oil idle level L1 can be chosen that at least a part of the elements of the gear arrangement 2, in particular the bearings 10, 10 'of the input shaft 7, the pinion 8 of the first gear stage 6, the second wheel 15 of the second gear stage 13 and the bearings 17, 17' of the Diffe renzials 16, immerse in the lubricating oil sump formed in this way with the lubricating oil resting level L1. In the calm state described above, the lubricating oil level L2 of the lubricating oil calming chamber 34 described below is identical to the lubricating oil resting level L1.

The insert element 25 is arranged with position elements 41, which engage in corresponding receiving areas of the housing arrangement 3, in the upper housing section. The insert element 25 has a distribution section 26 and an overflow section 27 which, when the transmission arrangement 2 is in operation, can collect and store splash oil of the transmission unit Ge, which can also be referred to as centrifuged oil. 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 catch area 45 which, when the gear arrangement 2 is operated in the preferred direction of rotation, i. H. as a rule, when the vehicle is moving forward, 6 oil collects from the first wheel 9 of the first gear stage 6. In special cases, the preferred direction of rotation can also be defined when the vehicle is reversing. The catch area 45 is arranged in axial overlap with the first wheel 9.

Starting from the catch area 45, the lubricating oil fed into the distribution section 26 is directed to a transmission-side outlet 31 and an engine-side outlet 31 ′. The outlets 31, 31 "can be connected to suitable oil guide elements, which guide the lubricating oil in a known manner to locations to be lubricated in the gear arrangement 2, such as bearings and toothing engagements, for example oil guide plates or oil guide holes in the housing arrangement 3 Distributor element 43 in the distribution section 26, the lubricating oil flow can be divided according to the need for the outlets 31, 31 ". In addition, a lubricating oil level L3 can form in the distribution section 26 before lubricating oil overflows from the distribution section 26. This defines the maximum amount of lubricating oil that can be taken up by the distribution section 26. The lubricating oil level L3 is arranged above the lubricating oil resting level L1. The distribution section 26 also has a wiper 42. During operation of the Ge gear arrangement 2 against the preferred direction of rotation, that is, as a rule when driving backwards, lubricating oil which has been taken up by the second wheel 15 of the second gear stage 13 is stripped off and thus reaches the distribution section 26. The distributor element 43 can be designed in this way that the stripped lubricating oil is distributed and directed to the outlets 31, 31 'according to the respective requirement.

A portion of the lubricating oil collected in the catch area 45 is also passed into the overflow section 27 and collected there. The overflow section 27 is formed bowl-shaped and has an overflow area in the form of an overflow edge 32. The vertically upward edge region of the overflow section 27, which is arranged vertically at the lowest level, is defined as the overflow edge 32. Thus, a lubricating oil level L4 can form in the overflow section 27 until the collected lubricating oil flows over the overflow edge 32. This defines the maximum amount of lubricating oil that can be absorbed by the overflow section 27. The lubricating oil level L4 is arranged vertically above the lubricating oil resting level L1. Alternatively, the overflow area can be configured as an opening in the overflow section 27. The lubricating oil level L4 is then defined by the vertically lowest point of the opening.

The insert element 25 encloses a partial area of the circumference of the second Ra of the 15 with the distribution section 26. With the catch area 45 and a part of the overflow section 27, the insert element 25 comprises the first wheel 9. In particular, the intermediate shaft 11 and the engine-side, the Input shaft 7 receiving bearings 10 'shaded from the spray oil of the first gear stage 6 and the second gear stage 13. In order to nevertheless ensure a sufficient supply of lubricating oil to the bearing 10 ', the overflow section 27 also includes an outlet 31 ", via which lubricating oil is conducted to the bearings 10, 10" of the input shaft 7, as shown in FIG. 14. The insert element 25 also includes a separating element 28 which is arranged in the axial direction between the center plane E1 of the first gear stage 6 and the center plane E2 of the second gear stage 13. However, it is also conceivable that the separating element 28 is designed as a separate component. In the present case, the separating element 28 has an annular section with a central opening 29 through which the intermediate shaft 11 is passed. The annular section is arranged in axial overlap with the first wheel 9 of the first gear stage 6. The outer diameter of the annular section is larger than the tip circle diameter of the first wheel 9. The separating element 28 has in the region of the circular annular section a connecting opening 30 which connects a first lubricating oil collecting section 18 of the gear arrangement 2 with a second lubricating oil collecting section 23 gear arrangement 2. It is also conceivable that instead of the connection opening 30, the separating element 28 has an opening which corresponds in particular to a circular ring segment. In the present case, the separating element 28 also forms a wall of the collecting section 26 and a wall of the overflow section 27 of the insert element 25.

The first wheel 9 of the first gear stage 6 is arranged in the first lubricating oil section 18 of the gear compartment. The first lubricating oil collection section 18 is limited on the side facing away from the engine by a pot-shaped limita tion section 19 of the transmission housing 5. On the engine side, the first lubricating oil collecting section 18 is delimited by the separating element 28 of the insert element 25. The outer contour of the separating element 28 follows in a partial area the limiting section 19 of the gear housing 5. It is also conceivable that sealing elements are arranged 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 gear housing 5 on the other hand .

The second wheel 15 of the second gear stage 13 is arranged in the second lubricating oil section 23 of the gear chamber. The second wheel 15 rotates in the opposite direction of rotation to the first wheel 9 of the first gear 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 gear housing 5. The second is on the engine side Lubricating oil collecting section 23 through a wall 46 of the motor housing 4 be limited. The motor housing 4 has an oil guide rib 20 which surrounds the second wheel 15 in a partial area in the circumferential direction. The partial area extends in the installed position of the drive arrangement 1 starting from a vertically lowest point of the second wheel 15 by up to 120 °, in particular up to 90 °, in the direction of the preferred direction of rotation. The oil guide rib 20 forms together with the outer contour and the Wan extension 46 of the motor housing 4 a cup-shaped section which surrounds the second wheel 15 approximately three-quarters. In the assembled state, the oil guide rib 20 also fixes, together with a fixing rib 44, the insert element 25 in the area of the separating element 28 in the axial direction between the motor housing 4 and the transmission housing 5.

The gear arrangement 2 has a lubricating oil guide geometry which is arranged in axial overlap with the second wheel 15 and is designed such that when the gear arrangement 2 is in operation, lubricating oil thrown off the second wheel 15 is directed in the direction of the first center plane E1.

The lubricating oil guide geometry in the present case comprises a catch groove 21 which is formed by an oil guide rib 20 together with a catch rib 22 of the motor housing 4 and is arranged in axial overlap with the second wheel 15 of the second gear stage 13. The catch groove 21 can be arranged in the housing space below a plane which is 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, starting from the motor side, along the width of the second wheel 15 in the direction of the separating element 28. The catch groove 21 and the connecting opening 30 of the separating element 28 are arranged in radial overlap with one another and border directly to each other. When the second wheel 15 rotates in the preferred direction of rotation, as represented by the arrow X1 in Figure 7, which in the present case corresponds to a forward drive, the second wheel 15 takes lubricating oil from the bottom of the second lubricating oil collecting section 23 and presses it against the catch groove 21. Due to the shape of the catch groove 21, the lubricating oil is deflected axially away from the engine side and through the connection opening 30 of the separating element. mentes 28 promoted in the first lubricating oil collecting section 18 in the direction of the first center plane E1. The corresponding lubricating oil movement is shown in FIGS. 7 and

8 represented by arrows.

It is also conceivable that the lubricating oil guide geometry is at least partially formed by a separate component, by the separating element 28 or by any combination of a separate component, the separating element 28 and the housing arrangement 3.

As already described above, the lubricating oil is passed from the first lubricating oil collecting section 18 via the catch groove 21 into the effective area of the first wheel 9 of the first gear stage 6, so that when the gear arrangement 2 is in operation, the filled lubricating oil from the lower housing section of the transmission is quick and easy arrangement 2, in particular from the floor area, is promoted into the insert element 25. In this way, the splashing losses caused by the second wheel 15 can be significantly reduced. At the same time, this two-stage guidance of the lubricating oil can ensure that the gear meshes of the first gear stage 6 and the gear stage 13 are both supplied with lubricating oil in a targeted, permanent and efficient manner.

In addition, through the lubricating oil guide geometry 21, the spray oil of the two-th gear stage 13 is axially fed to the first wheel 9 of the first gear stage 6. Compared to a gear arrangement 2 without such a separating element 28 between the first lubricating oil collecting section 18 and the second lubricating oil collecting section 23, an impact of the spray oil of the second gear stage 13 on the first wheel 9 of the first gear stage 6 is thus counter to the direction of rotation of the first wheel

9 reduced or prevented. The spray oil therefore does not have to be braked by the first wheel 9 to accelerate the spray oil in the opposite direction according to the direction of rotation of the first wheel 9. As a result, who reduces the splashing losses caused by the first wheel 9. It is particularly conceivable that the spray oil is deflected by the lubricating oil guide geometry 21 to such an extent that the spray oil is supplied to the first wheel 9 of the first gear stage 6 in the circumferential direction with the direction of rotation. The overflow edge 32 of the overflow section 27 of the insert element 25 is arranged above a heat-receiving surface 33 of the housing arrangement 3 oriented in the transmission space. The heat absorption surface 33 in the present case includes partial surfaces of the motor housing 4 and the transmission housing 5. The heat absorption surface 33 has a first section 33 ', which is arranged obliquely below the overflow edge 32. A second section 33 "extends from the first section 33 'with a slight inclination towards the bottom of the housing arrangement 3. A third section 33""connects the second section 33" to the bottom of the housing arrangement 3. Exceeds the level of the collected lubricating oil in the overflow section 27 the level L4 of the overflow edge 32, lubricating oil flows from the overflow section 27 to the first section 33 'of the heat-receiving surface 33. The lubricating oil continues to flow along the second section 33 "and the third section 33""by gravity. This enables the lubricating oil to deliver its thermal energy to the wall of the housing arrangement 3, so that high cooling of the lubricating oil can be achieved. For this purpose, the outer wall of the housing arrangement 3 in the area of the heat absorption surface 33 can be designed in such a way that the thermal energy is efficiently released to the surroundings.

The heat receiving surface 33 limits in particular together with the oil line 20 a lubricating oil calming chamber 34, in which the overflowing portion of the overflow section 27 of the insert element 25 is collected after it has flowed along the heat receiving surface 33. The lubricating oil calming chamber 34 is connected via an opening 35 in the oil guide rib 20 to the second lubricating oil collecting section 23. The opening 35 can be designed as a throttle, via which the second wheel 15 of the second gear stage 13 is supplied with lubricating oil in a defined amount and in a slightly turbulent state. This in turn can reduce the churning losses of the second wheel 15.

The size of the opening 35 can be used to set how much lubricating oil is accumulated in the lubricating oil calming chamber 34, so that at a reference operating point, in particular during nominal operation of the drive arrangement 1, in which second lubricating oil collecting section 23 forms a lubricating oil level L1 'and in the lubricating oil calming chamber 34 forms a lubricating oil level L2'. It is particularly taken into account here that at the reference operating point a portion of the lubricating oil filled into the housing arrangement 3 is stored in the insert element 25, the lubricating oil level L3 being formed in the distribution section 26 and the lubricating oil level L4 being formed in the overflow section 27. In the present case, around 30% of the originally filled amount of lubricating oil collects in the second lubricating oil collecting section 23 at the reference operating point, while up to 70% of the originally filled amount of lubricating oil accumulates in the insert element 25 and the lubricating oil calming chamber 34.

Reference list

1 drive arrangement

2 gear arrangement

3 housing arrangement

4 motor housing

5 gearbox

6 First gear stage

7 input shaft

8 sprockets

9 wheel

10, 10 'camp

1 1 intermediate shaft

12, 12 'bearings

13 Second gear stage

14 sprockets

15 sprocket

16 differential

17, 17 'camp

18 First lubricating oil collecting section

19 boundary section

20 oil guide rib

21 Catch groove, lubricating oil guide geometry 22 Catch rib

23 Second lubricating oil collecting section

24 wall section

25 insert element

26 distribution section

27 Overflow section, lubricating oil reservoir

28 separating element

29 opening

30 connection opening

31, 31 ', 31 outlet 32 overflow edge

33, 33 ″, 33 ″, 33 ″ “heat absorption surface

34 calming chamber

35 breakthrough

36 engine

37 motor shaft

38 control unit

39 wiring harness

40, 40 'output shaft

41 position element

42 wipers

43 distributors

44 fixing rib

45 catch area

46 wall

A, B, C axis of rotation

E level

L level

X preferred direction of rotation

Claims

Gear arrangement claims

1. Gear arrangement, in particular for an electric drive, comprising:

a housing arrangement (3);

a first gear stage (6) with a first wheel (9) which can be driven by a pinion (8) of the first gear stage (6) to rotate about a first axis of rotation (B) and has a first center plane (E1);

and a second gear stage (13) with a second wheel (15) which can be driven by a pinion (14) of the second gear stage (13) to rotate about a second rotational axis (C) parallel to the first rotational axis (B) and a second Mit ten plane (E2);

wherein the first gear stage (6) and the second gear stage (13) in the Ge housing arrangement (3) and received drive-connected to each other, and wherein the first wheel (9) to the second wheel (15) has an opposite direction of rotation;

a separating element (28) which is arranged axially between the first center plane (E1) and the second center plane (E2);

Lubricating oil, which is provided in the housing arrangement (3) and defines a lubricating oil resting level (L1) in the calm state;

characterized by a lubricating oil guide geometry (21) which, in the installed position of the gear arrangement, lies below a plane spanned by the first axis of rotation (B) and the second axis of rotation (C), the lubricating oil guide geometry (21) being axially overlapping with the second wheel (15) is arranged and designed to guide lubricating oil thrown off the second wheel (15) in the direction of the first center plane (E1) during operation of the gear arrangement.

2. Gear arrangement according to claim 1,

characterized,

that the lubricating oil guide geometry (21) is designed to guide lubricating oil thrown off the second wheel (15) into an effective area of the first wheel (9), from where the lubricating oil can be conveyed further by the first wheel (9).

3. Gear arrangement according to one of claims 1 or 2,

characterized,

that the lubricating oil guide geometry (21) is designed such that the lubricating oil thrown off the second wheel (15) is guided through an opening (30) of the separating element (28) in the direction of the first center plane (E1).

4. Gear arrangement according to one of claims 1 to 3,

characterized,

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

5. Gear arrangement according to claim 4,

characterized,

that the first lubricating oil collecting section (18) and the second lubricating oil collecting section (23) are at least partially limited by the separating element (28).

6. Gear arrangement according to one of claims 4 or 5,

characterized,

that the first lubricating oil collecting section (18) and the second lubricating oil collecting section (23) are connected to one another via the lubricating oil guide geometry (21).

7. Gear arrangement according to one of claims 4 to 6,

characterized,

that in the installed position of the gear arrangement, the first lubricating oil section (18) is arranged above the lubricating oil idle level (L1).

8. Gear arrangement according to one of claims 4 to 7,

marked by

a lubricating oil reservoir (27) which is arranged above the first lubricating oil collecting section (18) in the installed position of the gear arrangement,

the first wheel (9) conveying lubricating oil from the first lubricating oil collecting section (18) into the lubricating oil reservoir (27) during operation of the gear arrangement.

9. Gear arrangement according to one of claims 4 to 8,

marked by

a lubricating oil distribution arrangement (26),

the first wheel (9) conveying lubricating oil from the first lubricating oil collecting section (18) into the lubricating oil distribution arrangement (26) during operation of the gear arrangement.

10. Gear arrangement according to claim 9,

characterized,

that the lubricating oil distribution arrangement (26) comprises at least one outlet (31, 31 ') which directs the lubricating oil collected in the lubricating oil distribution arrangement (26) to bearings and / or gear meshing of the gear arrangement.

1 1. Gear arrangement according to claim 9 or 10,

characterized,

that the gear arrangement has an insert element (25) connected to the housing arrangement (3), which comprises at least one of the lubricating oil reservoir (27), the lubricating oil distribution arrangement (26) and the separating element (28).

12. Gear arrangement according to one of claims 8 to 1 1,

characterized,

that the lubricating oil reservoir (27) has an overflow area (32) which, in the installed position of the gear arrangement, above an internal convection onsfläche (33) of the housing arrangement (3) is arranged, wherein the Konvekti onsfläche (33) is at least partially arranged above the lubricating oil level (L1).

13. Gear arrangement according to one of claims 1 to 12,

marked by,

a lubricating oil calming chamber (34) of the housing arrangement (3), which is arranged at least partially in a lower section of the housing arrangement (3).

14. Gear arrangement according to claim 13,

characterized,

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

15. Gear arrangement according to claim 13 or 14,

characterized,

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