Gear arrangement and electric drive with the gear arrangement

Abstract

Gear arrangement (2) with a main axis (H), with a driven gear section (3), wherein the driven gear section (3) is arranged coaxially to the main axis (H), with a secondary axle (N), with an output pinion (4), wherein the output pinion (4) is arranged coaxially to the secondary shaft (N) and meshes with the output gear section (3), wherein an annular space section (5) is formed coaxially and concentrically to the output gear section (3), an insert component (14), wherein the insert component (15) has at least one oil guide structure (15), wherein the oil guide structure (15) is arranged at least section by section in the annular space section (5). characterized by the fact that the oil guide structure (15) has a ramp section (16), wherein the ramp section (16) is designed to rise in the axial direction in the direction of rotation around the skin axis (H).

Description

[0001] The invention relates to a transmission arrangement comprising a main shaft, a driven gear section (the driven gear section being arranged coaxially to the main shaft), a secondary shaft, and a driven pinion (the driven pinion being arranged coaxially to the secondary shaft and meshing with the driven gear section), wherein an annular space section is formed coaxially and concentrically to the driven gear section. The invention further relates to an electric drive for a vehicle comprising the transmission arrangement.

[0002] Vehicle transmissions have numerous components that interact with each other in contact zones during operation. To reduce friction and wear, these contact zones must be lubricated with a lubricant, particularly transmission oil. A key challenge is distributing the lubricant within the transmission in such a way that all contact zones are adequately supplied with it.

[0003] It is known to use dry sump lubrication systems, which collect the lubricant in a separate chamber and distribute it throughout the gearbox via a pressure pump. Alternatively, wet sump lubrication systems are known, in which the lubricant is collected in a base area of ​​the gearbox chamber and distributed from there by the movement of the components.

[0004] DE 10 2017 108 748 B3 discloses a transmission device with a transmission housing comprising a base and two side walls, a gear set with two parallel gears housed therein, and an oil guide structure manufactured as a separate component in the side region of the first gear. This structure includes a first aperture segment extending around the axis of the first gear, bounded by its inner and outer edges, the inner edge of which is closer to the axis than the base circle of the gear. A gap remains between the first gear and the aperture segment. A second, annular aperture segment adjoins the first aperture segment, carrying a semi-circular section that rises along the axis of the second gear and surrounds the tip circle of the second gear, leaving a gap.The half-shell section forms the inner wall of a hollow body curved in a semi-circular shape around the second gear axis.

[0005] EP 2 700 849 A1 discloses a lubricating oil supply device for a power transmission device comprising a lubricating oil reservoir, a first rotatable component connected to a vehicle wheel and supplying lubricating oil when rotating, a second rotatable component arranged above the first and also connected to the wheel, an oil receiving section above both rotatable components, a first passage to the oil receiving section, a second passage to the second rotatable component, and an outer circumferential flow passage extending along the circumference of the first rotatable component and conveying oil upwards. The first and second passages are each connected to the outer circumferential flow passage, with the inlet of the second passage located downstream of the inlet of the first passage. The second rotatable component further conveys the oil conveyed upwards in the second passage.The cross-sectional area of ​​the outer circumferential flow passage is smaller downstream of the inlet to the second passage than upstream of it.

[0006] US Patent 2012 / 0096968A1 discloses a transmission with a housing, several axially mounted shafts, and several gears arranged on the shafts and connectable to them via clutches. One of the gears, a large-diameter gear, has its lower portion immersed in a lubricating oil reservoir located in the housing and, as it rotates, pumps lubricating oil upwards. A collector, arranged along the axis of rotation of the large-diameter gear, collects the flung lubricating oil and directs it to lubrication points. The collector has a vertical wall off which the flung oil rebounds, flows down its surface, and is directed to a collection area. It also has an inlet area that allows oil flung between the collector and the gear to be guided to the collection area by its inertia.

[0007] The object of the present invention is to propose a transmission arrangement in which the lubrication supply is improved. This object is achieved by a transmission arrangement with the feature of claim 1 and by an electric drive with the features of claim 9. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description, and the accompanying figures.

[0008] The invention relates to a transmission arrangement which is particularly suitable and / or designed for use in a vehicle. The transmission arrangement is particularly preferably used to transmit drive torque to the vehicle. Alternatively or additionally, the transmission arrangement forms a section within the vehicle's drivetrain. The transmission arrangement is particularly preferably designed to transmit drive torque from an electric motor.

[0009] In the gear arrangement, a main axis and a secondary axis are defined, wherein the main axis and the secondary axis are preferably arranged parallel to each other. The main axis and the secondary axis are particularly well implemented as imaginary and / or virtual axes and / or form auxiliary lines for describing the gear arrangement.

[0010] The gear assembly has an output gear section which is arranged coaxially to the main shaft, in particular rotatably. The output gear section can be designed as a separate component, or alternatively, it can form an integral section of another component.

[0011] The transmission assembly further comprises an output pinion, wherein the output pinion is arranged coaxially to the secondary shaft and meshes with the output gear section. The output gear section and the output pinion form, in particular, a transmission stage.

[0012] Preferably, a torque flow runs from the output gear section to the output pinion.

[0013] A ring chamber section is formed coaxially and concentrically to the output gear section. Preferably, the ring chamber section is located in a common gear plane of the output gear section and the output pinion. The ring chamber section extends in the direction of rotation around the main axis in a circular segment, with at least one portion of the circular segment being recessed by the output pinion.

[0014] The invention proposes that the gear assembly includes an insert component. This insert component has at least one oil guide structure, wherein the oil guide structure is arranged at least partially or completely within the annular space. The oil guide structure serves to guide gear oil during operation of the gear assembly. The insert component with the oil guide structure utilizes the annular space as its installation area, which typically remains as free space in such a gear assembly.

[0015] According to the invention, the oil guide structure has a ramp section, the ramp section extending around the main axis in the direction of rotation. The ramp section is designed to rise in both the direction of rotation and the axial direction. Thus, the ramp section has a helical and / or screw shape in the direction of rotation. In particular, the ramp section is designed to rise axially in the direction of rotation of the output gear section. Due to this relative arrangement, during operation of the transmission assembly, the transmission oil flung off by the output gear section is transported up the ramp section, thus ensuring targeted transmission oil transport.

[0016] Preferably, the insert component is designed as a plastic component which is inserted into the gear assembly and optionally secured. In particular, the insert component is designed as a stationary component which does not rotate during operation of the gear assembly.

[0017] By inserting a cost-effective insert component, the lubrication supply to the gearbox assembly can be improved while utilizing available installation space within the gearbox assembly.

[0018] In an advantageous embodiment of the invention, the transmission assembly has an oiling channel section, wherein the oiling channel section is arranged in a conveying direction of the oil guide structure. In particular, the oiling channel section is positioned at the outlet of the oil guide structure. The oil guide structure ensures that transmission oil is transported into the oiling channel section. The oiling channel section can, for example, be designed as an inlet to an oil channel, wherein the oil channel directs the transmission oil to lubrication points and / or contact points of the transmission assembly. For example, the oiling channel section and / or the oil channel is arranged and / or depicted at least partially or completely within a housing of the transmission assembly.

[0019] The lubrication channel section is particularly preferably arranged at least above the main axis and / or in an angular segment between 330° and 30° around the main axis. The 0° position denotes the highest point of the gearbox assembly in its installed position.

[0020] It is preferred that the oil guide structure extends over an angular range of more than 90° but less than 180° around the main axis. This angular range provides a sufficient distance for capturing and guiding the transmission oil, while simultaneously ensuring that the transmission oil is transported a maximum of 180°, particularly to the lubrication channel section. The angular range thus constitutes an effective design of the insert component. In absolute terms, the angular range preferably extends between the 0° position and between 90° and 180°, or between the 0° position and between 270° and 180°.

[0021] In principle, the ramp section can have a guide surface which is formed by a radial vector guided helically around the main axis as its generating element.

[0022] In a preferred embodiment of the invention, the ramp section has a guide surface, wherein the guide surface forms a funnel section. The funnel section is oriented towards the main axis. The ramp section is generated by a vector whose base lies on the main axis but which is inclined relative to the main axis. The guide surface of the funnel section can be generated by a helical movement of the vector around the main axis. Such a funnel-shaped ramp section allows for more precise guidance of the gear oil.

[0023] In a preferred design embodiment, the oil guide structure has an outer wall section, which extends axially and is designed to run in the circumferential direction. This outer wall section thus forms a radially outer boundary of the ramp section. During operation, the gear oil can be guided into a groove between the guide surface and the outer wall section. This allows for particularly good control of the gear oil flow.

[0024] It is further preferred that the oil guide structure has an inner wall section extending axially and running in the circumferential direction. The inner wall section forms a radially inner boundary of the ramp section. Particularly in the embodiment where the oil guide structure has both the inner wall section and the outer wall section, a common groove is formed, wherein the groove bottom is formed by the ramp section and the groove walls by the inner wall section and the outer wall section.

[0025] Preferably, the inner wall section and / or the outer wall section extend only in sections along the ramp section in the direction of rotation. This allows the gear oil to be collected in a first region of the ramp section and introduced into the groove. It is possible that, viewed in the direction of rotation, the outer wall section begins earlier than the inner wall section, so that, in the direction of rotation of the output gear section, the gear oil is first collected by the outer wall section and only subsequently guided through the inner wall section into the groove. Optionally, the slope of the ramp section flattens out in the direction of rotation within the common groove.

[0026] A further aspect of the invention is an electric drive for a vehicle, wherein the electric drive comprises a transmission arrangement as previously described or according to one of the preceding claims. The electric drive is particularly suitable for a hybrid vehicle or a purely electric vehicle. The electric drive is particularly preferably implemented as an electric axle for the vehicle. Optionally, the electric drive includes the electric motor.

[0027] The output gear section and the output pinion can, in particular, form a gear stage to reduce the speed of the electric motor. The output gear section is driven by the electric motor, and the output pinion transmits the drive torque towards the driven wheels. Optionally, a planetary gear stage is arranged upstream of the gear stage in the torque flow. The gear stage and the planetary gear stage together form a pre-drive stage.

[0028] Further features, advantages, and effects of the invention will become apparent from the following description of preferred embodiments of the invention and the accompanying figures. These show: Fig. 1 a schematic longitudinal section through an electric drive of a vehicle to visualize the installation space for an insert component as an embodiment of the invention; Fig. 2 the insert component for the electric drive in the Fig. 1 in an axial top view; Fig. 3 the insert component of the Fig. 2 in a schematic 3-dimensional representation; Fig. 4 a schematic longitudinal section through the electric drive of the vehicle according to the Fig. 1 in a first section plane with inserted insert component; Fig. 5 a schematic longitudinal section through the electric drive of the vehicle according to the Fig. 1 in a second section plane with inserted insert component.

[0029] The Fig. Figure 1 shows a schematic longitudinal section of a part of an electric drive 1 for a vehicle as an embodiment of the invention. The electric drive 1 is, for example, designed as an electric axle. The illustration shows a section that forms a gear stage to reduce the high rotational speed of an electric motor (not shown) to a lower rotational speed.

[0030] The electric drive 1 has a gear assembly 2, wherein the gear assembly 2 implements the gear stage. The gear assembly 2 has an output gear section 3 and an output pinion 4. The output gear section 3 defines a main axis H, and the output pinion 4 defines a secondary axis N. The main axis H and the secondary axis N are aligned parallel to each other.

[0031] The output gear section 3 and the output pinion 4 mesh with each other, jointly defining a gear plane. The tooth contact between the output gear section 3 and the output pinion 4 defines an axial width perpendicular to the gear plane. An annular space section 5 is formed coaxially and / or concentrically to the output gear section 3 and the main axis H, lying in the same gear plane and having the described axial width.

[0032] The annular space section 5 is only partially formed in the direction of rotation around the main axis H and is interrupted in particular by the output pinion 4.

[0033] The annular space section 5 is thus designed as an annular space segment in the direction of rotation.

[0034] The electric drive 1, or the gear assembly 2, has an input shaft 6 which is arranged coaxially to the main axis H. In this embodiment, the input shaft 6 is implemented in two or more parts. A sun gear section 7 is arranged on the input shaft 6, which meshes with planets 8 that are rotatably mounted on a planet carrier 9. The planets 8 also mesh with a stationary ring gear 10. The output gear section 3 is fixedly mounted on the planet carrier 9. Functionally, the gear assembly 2 has a planetary gear stage comprising the sun gear section 7, the planets 8, the ring gear 10, and the planet carrier 9 for converting the drive torque. The output gear section 3 and the output pinion 4 form a downstream gear stage. The planetary gear stage and the downstream gear stage together form a pre-drive stage.The output pinion 4 is connected in a rotationally fixed manner to an output shaft (not shown), which directs the drive torque from the pre-drive stage and / or gear arrangement.

[0035] The transmission components are arranged in a housing 11. An oil channel 12 for guiding transmission oil is integrated into the housing 11. In alternative embodiments, the oil channel 12 can also be designed separately from the housing 11. The oil channel 12 opens into the input shaft 6, which is designed as a hollow shaft, through which transmission oil is guided and / or distributed via bores in the input shaft 6 within the transmission assembly 2. An oiling channel section 13 forms an inlet to the oil channel 12. In absolute terms, the oiling channel section 13 is located at the highest point, i.e., in a 0° position. Alternatively, the oiling channel section 13 can be positioned at + / - 30° around the 0° position. The oiling channel section 13 is open to the annular space section 5.

[0036] In the annular space section 5, at least in sections, an insert component 14 is arranged, which is located in the Fig. Figure 1 is only shown in a highly schematic form. The insert component 14 uses the annular space section 5 as available installation space to improve the transmission oil distribution in the transmission assembly 2.

[0037] In the Fig. 2 and Fig. Figure 3 shows the insert component 14 in a schematic 3-dimensional representation, firstly in an axial top view and secondly in a side view, with reference being made to both figures in the following description.

[0038] The insert component 14 is designed as a plastic component. It has the shape of an 8 in axial plan view. One opening of the 8 is coaxial with the main axis H, the other opening of the 8 is coaxial with the secondary axis N. The insert component 14 is stationary in the gear assembly 2 and / or the housing 11. The insert component 14 forms an oil guide structure 15 that extends approximately 1 / 3 and / or 120° around the main axis H. Through the oil guide structure 15, gear oil, which is flung off from the output gear section 3 and / or the planet carrier 9, is guided towards the lubrication channel section 13 as the inlet of the oil channel 12, so that the gear oil is guided via the oil channel 12 to the lubrication points of the gear assembly 2.

[0039] The oil guide structure 15 has a ramp section 16 which extends in the circumferential direction around the main axis H. The ramp section 16 is oriented in the axial direction and / or forms an axial surface. Along its course around the main axis H, the ramp section 16 rises in the axial direction, such that the available installation space in the annular space section 5 is greatest at the beginning of the ramp section 16 and smallest at the end of the ramp section 16 and / or in the end region at the lubrication channel section 13. The axial rise of the ramp section 16 conveys the gear oil towards the lubrication channel section 13. In the illustrated embodiment, the ramp section 16 forms a guide surface 17, which can be formed by a radial vector that is guided helically around the main axis H.

[0040] Radially, the guide surface 17 is bounded by an outer wall section 18. The outer wall section 18 and the guide surface 17 together form an outer groove extending in the direction of rotation, which opens into the lubrication channel section 13. Radially, the guide surface 17 is bounded by an inner wall section 19. The inner wall section 19 and the guide surface 17 together form an inner groove extending in the direction of rotation, which opens into the lubrication channel section 13. The ramp section 16, the outer wall section 18, and the inner wall section 19 together form a groove 20, which opens into the lubrication channel section 13. Although the ramp section 16, the outer wall section 18, and the inner wall section 19 all open into the lubrication channel section 13, they begin offset from each other in the direction of rotation.Viewed in the direction of rotation, ramp section 16 is the longest, followed by outer wall section 18, and finally inner wall section 19. Functionally, the transmission oil can initially flow along ramp section 16 and is subsequently limited by outer wall section 18. Only in the last part is there a limitation by inner wall section 19, which, however, also reduces the flow of transmission oil. Nevertheless, inner wall section 19 is advantageous because it allows the transmission oil to be guided very precisely into the lubrication channel section 13. The slope of ramp section 16 can be reduced in the area of ​​groove 20.

[0041] The Fig. Figure 4 shows a detail of a longitudinal section of the gear arrangement 2 as shown in the Fig. 1, however, along the intersection line A - A as shown in the Fig. Figure 2 is shown. The sectional view shows that the guide surface 17 is significantly offset from adjacent components in the axial direction. Furthermore, it can be seen that in this example, the guide surface 17 is inclined at an angle α relative to the main axis of rotation H, resulting in an inverted funnel. In modified embodiments, the inclination of the funnel is reversed and / or the angle α is less than 90°.

[0042] In the Fig. Figure 5 shows another section plane of the gear arrangement 2, formed by section plane BB. In this representation, the axial distance to the adjacent components of the guide surface 17 is significantly reduced, resulting from the axial rise of the ramp section 16. Furthermore, the transition of the guide surface 17 to the lubrication channel section 13 is visible. Reference symbol list 1 electric drive 2 Gear arrangement 3 Output gear section 4 output pinions 5 annular space section 6 Input wave 7 Sun wheel section 8 planets 9 planetary carriers 10 Ring gear 11 cases 12 Oil channel 13 Oiling channel section 14 Insert component 15 Oil conduit structure 16 Ramp section 17 Guide surface 18 Exterior wall section 19 Interior wall section 20 Nut H Main axis N secondary axle

Claims

[1] Gear arrangement (2) with a main axis (H), with a driven gear section (3), wherein the driven gear section (3) is arranged coaxially to the main axis (H), with a secondary axle (N), with an output pinion (4), wherein the output pinion (4) is arranged coaxially to the secondary shaft (N) and meshes with the output gear section (3), wherein an annular space section (5) is formed coaxially and concentrically to the output gear section (3), an insert component (14), wherein the insert component (15) has at least one oil guide structure (15), wherein the oil guide structure (15) is arranged at least section by section in the annular space section (5). characterized by , that the oil guide structure (15) has a ramp section (16), wherein the ramp section (16) is designed to rise in the axial direction in the direction of rotation around the skin axis (H). [2] Gear arrangement (2) according to claim 1, characterized by , that the insert component (14) is designed as a plastic component. [3] Gear arrangement (2) according to one of the preceding claims 1 or 2, characterized by an oiling channel section (13), wherein the oiling channel section (13) is arranged in a conveying direction of the oil guide structure (15). [4] Gear arrangement (2) according to claim 3, characterized by , that the lubrication channel section (13) is arranged in an angular segment between 330° and 30° around the main axis (H), wherein a 0° position denotes the highest point of the gear arrangement (2) in the installed position. [5] Gear arrangement (2) according to one of the preceding claims, characterized by , that the oil guide structure (15) extends over an angular range of more than 90° and / or less than 180° around the main axis (H). [6] Gear arrangement (2) according to claim 1, characterized by, that the ramp section (16) has a guide surface (17), wherein the guide surface (17) forms a funnel section. [7] Gear arrangement (2) according to one of claims 1 or 6, characterized by , that the oil guide structure (15) has an outer wall section (18) wherein the outer wall section (18) extends in the axial direction and runs in the circumferential direction and forms a radially outer boundary of the ramp section (16). [8] Gear arrangement (1) according to one of claims 1, 6 or 7, characterized by , that the oil guide structure (15) has an inner wall section (19) wherein the inner wall section (19) extends in the axial direction and runs in the circumferential direction and forms a radially inner boundary of the ramp section (16). [9] Electric drive (1) for a vehicle, characterized by a gear arrangement (2) according to one of the preceding claims.

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