Gearbox for a drive unit

Abstract

A transmission has an input element (4), at least one planetary gear set (20), a bearing for the input element (4), and a stationary component (9). The planetary gear set (20) has a planet carrier (22) and at least one planet gear (24). The planet carrier (22) has a connecting section (30) for a rotationally fixed connection to the stationary component (9), a carrier section (40) for supporting the planet gear (24), a bearing section (60) for rotatably supporting the input element (4) on the planet carrier (22), and a wall section. The wall section connects the connecting section (30), the carrier section (40), and the bearing section (60) to one another. The planet carrier (22) forms a lubricating oil guide, which forms a first oil channel (71) extending radially from the outside inward to the bearing section (60) for oiling the bearing section (60).The planet carrier (22) has a radially extending rib (51; 61) which stiffens a connection of the wall section to the bearing section (60).

Description

Technical area

[0001] The present invention relates to a transmission for a drive unit, a drive unit for a vehicle and a vehicle. State of the art

[0002] Transmissions for vehicle drive units are well known. In addition to converting or redirecting drive power, a transmission can perform other functions, such as lubricating drive unit elements and supporting rotating elements of the drive unit. Furthermore, high forces act within the transmission, which the transmission must be able to withstand. This can require a large number of components to fulfill individual functions. Furthermore, a complex transmission housing design may be necessary. Description of the invention

[0003] A first aspect relates to a transmission. The transmission can be provided for a drive unit of a vehicle, such as a motor vehicle, truck, passenger car, or work machine. The drive unit can be designed to provide a driving force for driving the vehicle. The transmission can be understood as part of the drive unit. The transmission has an input element, at least one planetary gear set, a bearing for the input element, and a stationary component. A stationary component can, for example, be a component that never rotates during operation of the drive unit. For example, the stationary component can be fixed to a body of the vehicle. The stationary component can, for example, be formed by a transmission housing or a fixed rotating element of the planetary gear set.

[0004] At the input element, driving force can be introduced into the transmission from a prime mover. The prime mover can be designed, for example, as an electric motor or as an internal combustion engine. The electric motor can be designed, for example, as a synchronous machine or an asynchronous machine. The electric motor can be designed, for example, to convert electrical current into mechanical force. The electric motor can have a rotor and a stator. A driving force can, for example, be provided to the rotor by the electric motor. The driving force can be used to drive the vehicle for driving operation. The vehicle can, for example, have an axle drive. The electric motor is arranged, for example, coaxially to the input element, the transmission and, alternatively or additionally, respective output shafts. A transmission can be designed to provide power transmission.The transmission can provide a gear ratio that can be adjustable or fixed, for example. Alternatively or additionally, the transmission can provide a differential function.

[0005] The planetary gear set has a planet carrier and at least one planet gear. The planetary gear set can further have a sun gear and a ring gear. The planet carrier, the ring gear, and the sun gear of a planetary gear set can be the rotating elements of the planetary gear set. The planet carrier can have planetary pins for supporting respective planet gears. One or more sets of one or more planet gears can be rotatably mounted on the planet carrier of a planetary gear set. A planetary gear set can, for example, be designed as a minus planetary gear set or a plus planetary gear set. In the minus planetary gear set, respective planet gears mesh with both the sun gear and the ring gear.

[0006] The planet carrier has a connecting section for a rotationally fixed connection to the stationary component. For example, the connecting section can have a driving toothing that engages with a corresponding driving toothing in the stationary component. The connecting section can also be designed for another form of non-positive or frictional rotationally fixed connection to the stationary component. The planet carrier has a carrier section for supporting the planet gear. The carrier section can be designed for the rotatable support of respective planet gears. For example, the carrier section can be designed to receive the respective planetary pins. The planet carrier has a bearing section for the rotatable support of the input element on the planet carrier. The bearing section can be designed to receive the bearing for the input element.The bearing for the input element can be formed by a rolling bearing, for example, a deep groove ball bearing. However, the input element can also be mounted on the bearing section by a plain bearing, which can then be formed jointly by the bearing section and the input element. The input element can, for example, be a motor shaft or a shaft that is permanently connected to the drive motor in a rotationally fixed manner or can be connected to it in a rotationally fixed manner by a switching element.

[0007] The planet carrier has a wall section. The wall section connects the connection section, the carrier section, and the bearing section to one another. The wall section can be formed integrally with the connection section, the carrier section, and the bearing section. The planet carrier can be formed integrally as a whole. The wall section can extend radially. The wall section can, for example, be substantially annular. A radial direction can be perpendicular to a rotational axis of the input element. If an element is arranged radially on the inside, it is, for example, arranged closer to the rotational axis of the input element than a part radially outer to it. A radially on the inside element can, for example, be a section of the planet carrier that is radially closest to the rotational axis of the input element.If an element is arranged radially on the outside, it is arranged further away from the axis of rotation of the input element than a part that is radially inner to it. An element arranged radially on the outside can, for example, be a section of the planet carrier that is radially furthest away from the axis of rotation of the input element. An axial direction can be parallel, for example coaxial, to the axis of rotation. The bearing section can, for example, extend axially from the wall section on both sides, for example to a first side and an opposite second side. The first side can be a side that faces the drive motor. The second side can be a side that faces away from the drive motor. However, the bearing section can also extend axially from the wall section on only one side.The connecting section and the carrier section can extend axially from the wall section only to one side, for example, to the second side of the planet carrier. However, the connecting section and, alternatively or additionally, the carrier section can also extend axially to the wall section on both sides.

[0008] If two elements are fastened to one another, they are directly or indirectly coupled in such a way that a movement of one element causes a reaction in the other element. For example, fastening can be provided by a positive or frictional connection. Additional elements can be provided between the elements. A rotationally fixed connection between two elements is understood to be a connection in which the two elements are rigidly coupled to one another in all intended states of the transmission. There can be intentional or unintentional slippage between the two elements. The elements can be present as individual components that are connected to one another in a rotationally fixed manner or as a single piece. A switching element, for example a clutch or brake, can, however, selectively establish or break a rotationally fixed connection between two elements.If, on the other hand, two elements are mechanically operatively connected, they are directly or indirectly coupled to one another in such a way that a movement of one element causes a reaction in the other. The mechanical operative connection can be formed by the meshing of corresponding gears of the two elements. Additional elements, such as one or more spur gear stages, can be provided between the elements.

[0009] The planet carrier forms a lubricating oil guide. The lubricating oil guide forms a first oil channel for oiling the bearing section. The bearing section is arranged radially inward. The first oil channel extends radially from the outside to the inside to the bearing section. The bearing section can be supplied with lubricating oil via the first oil channel. The lubricating oil guide can be supplied with oil from a lubricating oil supply. For example, the first oil channel can be fluidly connected to the lubricating oil supply. The lubricating oil supply can, for example, have an oil reservoir, such as an oil pan or an annular channel radially around a section of the stator, and a means for building up pressure, such as a lubricating oil pump. One or more connecting parts, such as a hose or other components with an oil channel, can be provided between the lubricating oil pump and the planet carrier.

[0010] The planet carrier has at least one radially extending rib, which stiffens a connection between the wall section and the bearing section. The rib can extend between the wall section and the bearing section. The rib can protrude axially from the wall section and be radially connected to the bearing section. The rib can be arranged radially outward of the bearing section. The rib can be formed integrally with the wall section and the bearing section. The rib can be solid. The rib can be formed free of a channel guided therein. A plurality of ribs can be provided, wherein respective embodiments for one rib can also apply to the other ribs, if applicable. The ribs can be designed as sensor ribs and alternatively or additionally as bearing ribs. The sensor ribs can extend radially outward from a sensor section.The sensor section is described further below. The bearing ribs can extend radially between the bearing section and the sensor section. The ribs can be arranged radially and alternatively or additionally axially within an outer circumferential surface of the carrier section. The ribs can protrude axially towards the first side. There can also be ribs that protrude axially towards the second side. The ribs can be distributed in the circumferential direction. The ribs can be evenly distributed in the circumferential direction. The ribs allow the planetary carrier to have high rigidity. This allows the transmission to withstand high loads. In addition, the lubricating oil guide can be easily integrated without excessively weakening the planetary carrier.

[0011] At least one of the connecting portion, the support portion, the sensor portion described later, and the support portion may be annular. Each of the connecting portion, the support portion, the sensor portion, and the support portion may be substantially annular. An annular element may extend in the circumferential direction around the rotation axis. At least one of the connecting portion, the support portion, the sensor portion, and the support portion may be arranged concentrically with the input element. Each of the connecting portion, the support portion, the sensor portion, and the support portion may be arranged concentrically with the input element.

[0012] In one embodiment of the transmission, the connection section can be arranged radially outwardly of the support section. The support section can be arranged radially outwardly of the bearing section. The support section can be arranged radially outwardly of the sensor section. The sensor section can be arranged radially outwardly of the bearing section. The sensor section can be arranged radially inwardly of the connection section and, alternatively or additionally, the support section. The wall section can extend radially along the bearing section, the support section, and, alternatively or additionally, the connection section.

[0013] In one embodiment of the transmission, the lubricating oil guide can further have a second oil channel which fluidically connects two axially opposite sides of the planet carrier. The second oil channel can fluidically connect the first side and the second side. The second oil channel can fluidically connect the first side and the second side in such a way that oil flow from the first side to the second side and vice versa is possible. The second oil channel can be designed to supply lubricating oil or to guide lubrication. The second oil channel can be designed to supply the first side with lubricating oil. A return flow of lubricating oil from the lubricating oil guide can also occur via the second oil channel, for example after the bearing section has been lubricated. The return flow allows lubricating oil to flow back to the lubricating oil supply.

[0014] If a component is designed to fluidically connect two elements, the component provides a fluid connection between the two elements. For example, this component can conduct lubricating oil from one element to the other. If two elements are fluidly connected to one another, a fluid, for example oil, can flow from one element to the other. The fluid connection can be designed to be leak-free, so that the oil is conducted essentially completely from one element to the other. For this purpose, a seal, such as an O-ring or a labyrinth seal, can be provided between two elements.

[0015] The second oil channel can extend through the wall section. The second oil channel can extend axially. The second oil channel can be formed by one or more openings in the wall section. The openings can each form a sub-channel of the second oil channel or can also be fluidically connected to one another within the planet carrier. The opening can be designed as an elongated hole or a circular hole. The elongated hole can be curved, for example, to follow an annular shape of the wall section. The elongated hole can be concentric to the axis of rotation. The second oil channel can be arranged radially outwardly of the bearing section and alternatively or additionally of the sensor section.

[0016] In one embodiment of the transmission, the second oil channel can have a first orifice region, a second orifice region, and a third orifice region. However, the second oil channel can also have only one or two of the orifices. At least one of the first orifice region, the second orifice region, and the third orifice region can form an orifice opening. The first orifice region can be arranged in a lower region of the wall section in an installed position of the transmission in a horizontally oriented vehicle. The lower region can be arranged at the bottom with respect to a direction of gravity. This allows lubricating oil to flow out easily here in such a horizontal orientation of the vehicle.The first mouth region can be arranged further outward in the radial direction than the second and third mouth regions. The second mouth region can be arranged offset from the first mouth region in the wall section in a first circumferential direction. The third mouth region can be arranged offset from the first mouth region in the wall section in a second circumferential direction opposite to the first circumferential direction. The second mouth region and the third mouth region can be arranged evenly distributed in the circumferential direction. The second mouth region and the third mouth region can be arranged symmetrically or asymmetrically to the direction of gravity laterally to the first mouth region.As a result, the second oil channel can provide a supply of lubricating oil even if the orientation of the oil level in the transmission housing changes due to, for example, acceleration, deceleration, or tilting of the vehicle. For example, during acceleration or on an uphill slope, lubricating oil can collect at the second outlet area instead of the first outlet area and flow away easily there. For example, during braking or on a downhill slope, lubricating oil can collect at the third outlet area instead of the first outlet area and flow away easily there. A lubricating oil circuit can thus be maintained particularly reliably.

[0017] In one embodiment of the transmission, at least one of the first, second and third orifice regions can have two orifices arranged side by side in the circumferential direction.

[0018] At least one of the first, second and third mouth regions can be closed off in sections, for example by a web of the wall section. Two or three of the mouth regions can also have this web. For example, the second and third mouth regions can have the web. Then one of the first, second and third mouth regions can have two mouth openings that are separated from one another by the web. The first oil channel can be formed in the closed region, for example the web. The two mouth openings can be arranged closer to one another in the circumferential direction, for example, than two mouth regions adjacent in the circumferential direction. However, the web can also be free of an oil channel. The web can stiffen the wall section compared to, for example, a mouth region that is continuously designed as an elongated hole.The planetary carrier can thus continue to withstand high loads despite having a large number of orifices. The first oil channel can overlap one of the first, second, and third orifices in the circumferential direction, for example, at the web.

[0019] In one embodiment of the transmission, the transmission can further comprise a sensor element. The planetary carrier can further comprise the sensor section for fastening the sensor element. The sensor section can be arranged radially between the carrier section and the bearing section. The sensor element can be designed as a rotational speed sensor. The sensor element can be configured to determine a rotational position and, alternatively or additionally, a rotational speed of a rotating component of the transmission, for example, the input element.

[0020] The sensor section can extend axially from the wall section to the first side. Alternatively, the sensor section can also extend axially from the wall section to the second side or on both sides. The sensor section can be designed as a circumferential, protruding ring. The sensor section can have a recess, for example a section in the circumferential direction with a smaller axial extension or in which the sensor section is interrupted. The recess can be designed to pass through a signal line from the sensor element to an outer side of the planet carrier and, alternatively or additionally, an evaluation unit. The recess can be formed in the axial direction on the first side of the sensor section. The recess can extend axially to one end of the sensor section on the first side. The recess can also be designed as a through-opening in the sensor section.An inner circumference of one of the sensor sections, for example on the first side, can be configured to accommodate the sensor element. The sensor element can be glued, clamped, or screwed to the sensor section, for example. The inner circumference can be cylindrical.

[0021] In one embodiment of the transmission, the connecting section can have a plurality of engagement sections spaced apart from one another in the circumferential direction, which engage with the stationary component to provide the rotationally fixed connection.

[0022] The engagement sections can each form a driving toothing on an outer circumference. The driving toothing can be formed by a spline, for example, a splined shaft toothing or a toothed shaft toothing. The driving toothing can extend axially. The driving toothing can extend axially from a seal receiving section described later along the entire engagement section. The driving toothing can be provided only in the engagement sections. The connecting section can also be free of any further sections apart from the engagement sections. The connecting section can be designed as a segmented ring. Due to the segmentation, the connecting section can be securely connected to the stationary component even with high tolerances. Furthermore, the planet carrier can be very lightweight.The driving toothing can extend axially from the seal receiving portion in sections along the engagement portion.

[0023] The connecting section can form a plurality of engagement sections. The engagement sections can be distributed in the circumferential direction. The engagement sections can be evenly distributed in the circumferential direction. The engagement sections can be arranged radially symmetrically to the axis of rotation. The engagement sections can be arranged in segments in the circumferential direction. Screw connections for fastening a housing cover to the stationary component can be arranged between the segment-like engagement sections. This allows the planet carrier to be very compact radially. The screw connections can be arranged radially offset inward relative to an outer circumference of the engagement sections.

[0024] At least one engagement section can have an axial contact section. The axial contact section can be offset from the drive toothing, for example, toward the second side. The axial contact section can be designed to bear against the housing cover. The axial contact section can limit an axial movement of the planet carrier relative to the stationary component. The axial contact section can be formed by an end face of one of the engagement sections. The connecting section can have a plurality of axial contact sections, for example, one axial contact section per engagement section.

[0025] In one embodiment of the transmission, the transmission can have a sealing element, for example to seal a connection between the stationary component and the planet carrier. The connecting section can have a seal receiving section on which the sealing element can be arranged. The sealing element can seal the seal receiving section with the stationary component. The sealing element can be designed, for example, as an O-ring or a labyrinth seal. The sealing element can be arranged on the seal receiving section such that the first side is sealed fluid-tight from the second side. The seal receiving section can form a groove running circumferentially. The groove can be designed to receive the sealing element. Alternatively, a labyrinth seal can be formed, for example, between the stationary component and the planet carrier.

[0026] The seal receiving portion may have a radial bearing surface for bearing against the stationary component. The radial bearing surface may be configured for positioning the planet carrier in the radial direction. A diameter of an outer circumference of the seal receiving portion may be smaller than a diameter of an outer circumference of at least one of the engaging portions. The connecting portion may have a stepped portion. The stepped portion may be formed axially between one of the engaging portions and the seal receiving portion. The stepped portion may be configured for axial bearing against the stationary component. The stepped portion may limit axial movement of the planet carrier. The stepped portion may limit axial movement of the planet carrier in a direction opposite to the axial bearing portion of one of the engaging portions.

[0027] The connection section can have a third oil channel. The third oil channel can be formed on an outer circumference of the seal receiving section. The third oil channel can be formed by a recess. The recess can extend axially. The recess can extend to the first side. The third oil channel can be fluidly connected to the lubricating oil supply. The first oil channel can extend radially inward from the third oil channel. The first oil channel can open into the third oil channel. The third oil channel does not extend axially beyond the sealing element, for example. For example, the third oil channel can be arranged on the first side relative to the sealing element.

[0028] In one embodiment of the transmission, the carrier section can have a planetary gear recess which extends in the radial direction through the carrier section and is designed to receive the planetary gear. A wall of the carrier section delimiting the planetary gear recesses can partially enclose a planetary gear arranged in the planetary gear recess. The carrier section can form planetary pin receptacles which are arranged in the axial direction on both sides of the planetary gear recess. The planetary pin receptacles can be designed to receive, for example, rotationally fixedly, the planetary pins. The planetary pin receptacles can each be designed as bores. On the second side relative to the planetary gear recess, a planetary pin securing section can be formed. The planetary pin securing section can be designed as a bore. The planetary pin securing section can extend radially.The planetary pin retaining section can, for example, extend radially from an outer circumference of the carrier section to one of the planetary pin receptacles. The planetary pin retaining section can be designed to accommodate a cylindrical pin or a roll pin.

[0029] A carrier recess can be formed in the circumferential direction between two adjacent planetary gear recesses, in which the carrier section is then designed, for example, to be double-walled. The carrier recess can extend axially. The carrier recess can extend to the second side, for example from the wall section. The carrier recess can be designed in the form of an elongated hole. The carrier recess or the elongated hole can be designed as a blind hole. The elongated hole can be curved. The elongated hole can be designed concentrically to the axis of rotation. The carrier section can form several carrier recesses in the circumferential direction. The carrier recesses can be arranged so as to be evenly distributed in the circumferential direction. At least one of the carrier recesses can be aligned with one of the first, second and third mouth openings. Joint production, for example by milling or drilling, is then possible.The support recess can be arranged radially between an outer circumference and an inner circumference of the support section. In the area of ​​the support recesses, the support section can be radially double-walled.

[0030] In one embodiment of the transmission, the bearing section can have a first bearing seat for supporting the input element and a second bearing seat for supporting a rotating element of the transmission. The first bearing seat and the second bearing seat can be arranged offset from one another in the axial direction. The bearing of the rotating element can be designed as a rolling bearing, for example as a needle bearing, or as a plain bearing. The bearing of the rotating element can have an outer ring or a sleeve. The second bearing seat can be arranged radially inside the first bearing seat. The second bearing seat can be formed, for example, by a radially inner circumferential surface and the first bearing seat likewise by a radially inner circumferential surface of the bearing section. A stepped section can be formed axially between the first bearing seat and the second bearing seat.The first oil channel can open into an axial area between the first bearing seat and the second bearing seat.

[0031] In one embodiment of the transmission, the transmission can further comprise a first output shaft, a second output shaft, a first planetary gear set, and a second planetary gear set. The second planetary gear set can form the planetary gear set whose planet carrier is connected in a rotationally fixed manner to the stationary component. It can therefore be the planet carrier described above. A planet carrier of the first planetary gear set can, for example, not be connected in a rotationally fixed manner to the stationary component. The input element can be mechanically operatively connected to the first planetary gear set for introducing a torque into the transmission. The first output shaft can be mechanically operatively connected to the first planetary gear set for outputting a torque from the transmission. The second output shaft can be mechanically operatively connected to the second planetary gear set for outputting a torque from the transmission.

[0032] The first planetary gear set may include at least a first rotating element, a second rotating element, and a third rotating element. The first planetary gear set may include a first sun gear, a first planet carrier, a first planet gear, and a first ring gear. The first planetary gear set may include, for example, four first planetary pinions and four first planetary gears rotatably mounted thereon. The first sun gear may mesh with the respective first planetary gears. The first ring gear may mesh with the respective first planetary gears. The first planetary pinions may be connected to the first planet carrier. The first planet carrier may form the rotating element that is mounted on the second bearing seat.

[0033] The second planetary gear set can have at least a first rotating element, a second rotating element, and a third rotating element. The second planetary gear set can have a second sun gear, a second planet carrier, a second planet gear, and a second ring gear. The numbering is for assignment purposes, and the second planetary gear set can, for example, have only a single sun gear. The second planetary gear set can have a plurality of second planet pinions and a plurality of second planet gears rotatably mounted thereon. The second sun gear can mesh with the respective second planet gears. The second ring gear can mesh with the respective second planet gears. The second planet pinions can be connected to the second planet carrier.

[0034] The first and second planetary gear sets can be designed as a negative planetary gear set or as a positive planetary gear set. The stationary component can be designed as a transmission housing.

[0035] The first rotating element of the first planetary gear set can be rotationally fixedly connected to an input element. The first rotating element can be formed by the first sun gear. The input element can be connected to the rotor for receiving torque. The second rotating element of the first planetary gear set can be rotationally fixedly connected to the first output shaft. The third rotating element of the first planetary gear set can be rotationally fixedly connected to the first rotating element of the second planetary gear set. The second rotating element of the second planetary gear set can be rotationally fixedly connected to the stationary component. The third rotating element of the second planetary gear set can be rotationally fixedly connected to the second output shaft.

[0036] If the first or second planetary gear set is designed as a negative planetary gear set, the respective second rotating element can be formed by the planet carrier. The respective third rotating element can then be formed by the ring gear. The third rotating element of the first planetary gear set and the first rotating element of the second planetary gear set can be connected to one another in a rotationally fixed manner, for example by being formed integrally. For example, the third rotating element of the first planetary gear set and the first rotating element of the second planetary gear set can be formed by a sun ring gear.

[0037] If the first or second planetary gear set is designed as a positive planetary gear set, the respective second rotating element can be formed by the ring gear. The respective third rotating element can then be formed by the planet carrier.

[0038] The first planetary gear set and the second planetary gear set can be arranged in the same plane in the axial direction. The second planetary gear set can be arranged outside the first planetary gear set in the radial direction. The first planetary gear set and the second planetary gear set can also be arranged offset from one another in the axial direction.

[0039] The first output shaft and the second output shaft can be arranged coaxially with the input element. The first output shaft can extend through the input element in the axial direction. The first output shaft can extend at least partially in the axial direction within the second output shaft. The first output shaft can be rotatably mounted in the second output shaft. The first and second output shafts can extend in opposite directions in the axial direction.

[0040] The transmission may function as a differential. The transmission may be configured to distribute torque from the input element to the first output shaft and the second output shaft.

[0041] A second aspect relates to a drive unit, for example of a motor vehicle. The drive unit has a transmission according to the first aspect. Respective further features, embodiments, and advantages can be found in the descriptions of the first aspect. Conversely, features, embodiments, and advantages of the second aspect also represent features, embodiments, and advantages of the first aspect. The drive unit can have a prime mover with a rotor. The prime mover can be designed as an electric motor. The electric motor can form a traction motor of the drive unit. The rotor can be mechanically operatively connected to an input element of the transmission, for example via a spur gear stage. The mechanical operative connection of the rotor to the input element can also be provided by a rotationally fixed connection. The rotor can form the input element.The electric motor may be configured to drive the input element.

[0042] A third aspect relates to a vehicle, for example a motor vehicle. The vehicle has a drive unit according to the second aspect and, alternatively or additionally, a transmission according to the first aspect. Respective further features, embodiments, and advantages can be found in the descriptions of the first and second aspects. Conversely, features, embodiments, and advantages of the first and second aspects, respectively, also represent features, embodiments, and advantages of the third aspect. The vehicle can have at least a first output element and a second output element. The first output shaft can be configured to drive the first output element. The second output shaft can be configured to drive the second output element. An output element can be configured, for example, as a wheel or a track. The vehicle can stand with the output elements, for example, on a surface. Short description of the characters Fig. 1 shows a sectional view of a drive unit. Fig. 2 shows a detail of the sectional view of the drive unit according to Fig. 1. Fig. 3 shows a side view of a planet carrier of the drive unit according to Fig. 1. Fig. 4 shows a front view of the planet carrier. Fig. 5 shows a rear view of the planet carrier. Fig. 6 shows a perspective view of the planet carrier. Fig. 7 shows another perspective view of the planet carrier. Fig. 8 shows another perspective view of the planet carrier. Fig. 9 shows another perspective view of the planet carrier. Fig. 10 shows a detail of a sectional view of the drive unit. Detailed description of embodiments

[0043] Fig. 1 shows a sectional view of a first embodiment of a drive unit for a vehicle. Fig. Figure 2 shows a detail of the sectional view of the first embodiment of the drive unit. The drive unit comprises a transmission with an input element 4, a first planetary gear set 10, a second planetary gear set 20, a bearing for the input element 4, a stationary component 9, here embodied as a transmission housing, a sensor element 80, and an electric motor (not shown here) with a rotor. The second planetary gear set 20 comprises a second planet carrier 22 and a plurality of second planet gears 24.

[0044] The second planet carrier 22 is shown in detail in the remaining figures. The second planet carrier 22 has a connection section 30 for the rotationally fixed connection to the stationary component 9. The second planet carrier 22 has a carrier section 40 for supporting the planet gear 24. The second planet carrier 22 has a sensor section 50 for fastening the sensor element 80. The second planet carrier 22 has a bearing section 60 for rotatably supporting the input element 4 on the second planet carrier 22. The second planet carrier 22 has a wall section which connects the connection section 30, the carrier section 40, the sensor section 50, and the bearing section 60 to one another. The second planet carrier 22 is formed in one piece.The second planet carrier 22 has at least a plurality of sensor ribs 51 and a plurality of bearing ribs 61, which stiffen a connection of the wall section to the bearing section 60.

[0045] The bearing section 60 is arranged radially inward. The connection section 30 is arranged radially outward of the carrier section 40. The carrier section 40 is arranged radially outward of the sensor section 50. The sensor section 50 is arranged radially outward of the bearing section 60 and radially inward of the connection section 30 and the carrier section 40. The wall section extends substantially radially along the other sections. The second planet carrier 22 forms a lubricating oil guide. The lubricating oil guide is designed to lubricate the bearing section 60.

[0046] The first planetary gear set 10 has a first sun gear 11, a first planet carrier 12, a plurality of first planet pinions 13, a corresponding plurality of first planet gears 14, and a first ring gear 15. The first sun gear 11 is formed by an input element 4, which is rotationally fixedly connected to the rotor. The first sun gear 11 meshes with the first planet gears 14. The first planet gears 14 mesh with the first ring gear 15 and are each rotatably mounted on an associated one of the first planet pinions 13. The first planet pinions 13 are connected to the first planet carrier 12. The first planet carrier 12 is rotationally fixedly connected to a first output shaft 5.

[0047] The second planetary gear set 20 has a second sun gear 21, the second planet carrier 22, a plurality of Fig. 10 shown second planetary bolt 23, a corresponding plurality of Fig. 10 and a second ring gear 25. The second planet gears 24 are each rotatably mounted on one of the second planetary pinions 23. The second sun gear 21 meshes with the second planet gears 24. The second planet gears 24 mesh with the second ring gear 25. The second planetary pinions 23 are connected to the second planet carrier 22. The second planet carrier 22 is connected in a rotationally fixed manner to the stationary component 9. The second ring gear 25 is connected in a rotationally fixed manner to the second output shaft 6.

[0048] The first ring gear 15 and the second sun gear 21 are formed by a sun ring gear 1 and are thus connected to one another in a rotationally fixed manner. The sun ring gear 1 has a toothing of the first ring gear 15 on an inner circumference. The sun ring gear 1 has a toothing of the second sun gear 21 on an outer circumference. The first planetary gear set 10 and the second planetary gear set 20 are arranged at least partially in the same axial region. The second planetary gear set 20 is arranged radially outside the first planetary gear set 10. The first output shaft 5, the input element 4, the second output shaft 6, the first planetary gear set 10 and the second planetary gear set 20 are coaxial with one another and arranged in this sequence radially from the inside to the outside. The first output shaft 5 and the second output shaft 6 extend in opposite directions in the axial direction.

[0049] The connecting section 30, the support section 40, the sensor section 50, and the bearing section 60 are annular and arranged concentrically. The bearing section 60 extends axially from the wall section both to a first side, the left side in Fig. 1, which is facing the electric motor as well as to a second side, the right side in Fig. 1, which faces away from the electric motor. The sensor section 50 extends axially from the wall section to the first side. The connection section 30 and the support section 40 extend axially from the wall section to the second side.

[0050] The connection section 30 has a seal receiving section 32 on which a sealing element is arranged. The sealing element seals the seal receiving section 32 with the stationary component 9. The sealing element is designed as an O-ring. The seal receiving section 32 forms a groove running circumferentially in a circumferential direction. The sealing element is fitted into the groove. The seal receiving section 32 forms a radial contact surface on an outer circumference for contact with the stationary component 9. The second planet carrier 22 is positioned radially in the stationary component 9 via the radial contact surface. The seal receiving section 32 forms a stepped section for contact with the stationary component 9. An axial movement of the second planet carrier 22 relative to the stationary component 9 is limited via the stepped section.

[0051] The connecting section 30 has several Fig. 3 and spaced apart from one another in the circumferential direction, which engage with the stationary component 9 to provide the rotationally fixed connection. Fig. 3 shows a perspective view of a first embodiment of the second planetary carrier 22 of the drive unit. The engagement sections 31 are arranged evenly spaced in the circumferential direction and each form a segment of the segmented connection section 30. The engagement sections 31 extend from the seal receiving section 32 axially away from the electric motor to the second side. Each engagement section 31 has a driving toothing, which in this case is formed by a spline toothing. The driving toothing extends axially from the seal receiving section 32 away from the electric motor to the second side. A diameter of an outer circumference of the engagement sections 31 is smaller than a diameter of an outer circumference of the seal receiving section 32.

[0052] Each engagement section 31 in the circumferential direction has an axial contact section which is designed to engage a housing cover and which extends in the axial direction up to the housing cover. A segment clearance is provided between two engagement sections 31 adjacent in the circumferential direction. Fastening elements 91, in this case screw connections, for fastening a housing cover to the stationary component 9 are arranged in the circumferential direction in a region of the segment clearances. In this region, the fastening elements 91 and their receptacles in the stationary component 9 are arranged radially inwardly offset with respect to the outer circumference of the seal receiving section 32, as shown in Fig. 10 shown.

[0053] The carrier section 40 has a Fig. 9, which extends in the radial direction through the carrier section 40. The planetary gear recesses 41 are designed to accommodate the second planetary gears 24. In the present embodiment shown, six planetary gear recesses 41 are provided for six second planetary gears 24. The carrier section 40 has a corresponding number of planetary pin receptacles 42, which are arranged on both sides of each planetary gear recess 41 in the axial direction. Each of the planetary gear recesses 41 is formed by a bore for receiving an end section of one of the second planetary pins 23. On the second side relative to the planetary gear recesses 41, a planetary pin securing section 42 is formed axially adjacent to each planetary gear recess 41.The planetary pin securing portion 42 is formed by a bore in the radial direction, which extends from an outer circumference of the carrier portion 40 to the respective planetary pin receiving portion 42. The planetary pin securing portion 42 is designed for fastening a clamping pin.

[0054] A carrier recess 43 is formed in the circumferential direction between each two adjacent planetary gear recesses 41. Thus, six carrier recesses 43 are provided. Each of the carrier recesses 43 is formed as an elongated hole. The elongated holes are each curved and concentric with a rotational axis of the input element 4. The elongated holes extend axially. In the area of ​​the carrier recesses 43, the carrier section 40 is double-walled. This makes the second planetary carrier 22 lightweight.

[0055] The sensor section 50 has a cylindrical receptacle on an inner circumference on the first side for fastening the sensor element 80. The sensor section 50 has a sensor recess 52 on the first side for passing a signal line from the sensor element 80 to an outer side of the second planet carrier 22.

[0056] The bearing section 60 has a first bearing seat for supporting the input element 4. The bearing section 60 further has a second bearing seat for supporting the first planet carrier 12, as a rotating element of the transmission. The first bearing seat and the second bearing seat are arranged offset from one another in the axial direction. The bearing for the input element 4 is formed in this case by a deep groove ball bearing. The bearing for the first planet carrier 12 is formed in this case by a needle bearing with an outer ring. The second bearing seat is arranged radially inside the first bearing seat, such that a stepped section is formed between the first bearing seat and the second bearing seat. The first bearing seat is arranged on the first side relative to the wall section. The second bearing seat is arranged on the second side relative to the bearing seat. The first bearing seat and the second bearing seat are formed coaxially with one another.

[0057] Each of the sensor ribs 51 extends, as shown in Fig. 4, from the sensor portion 50 in the radial direction outwards. The extension in the axial direction of each of the sensor ribs 51 decreases radially outwards until the sensor rib 51 ends. The sensor ribs 51 extend along the wall portion. Each of the bearing ribs 61 extends radially from the bearing portion 60 to the sensor portion 50 with a substantially constant cross-section. The bearing ribs 61 extend along the wall portion. The sensor ribs 51 and the bearing ribs 61 are distributed in a star shape in the circumferential direction and arranged at equal distances. Each of the sensor ribs 51 and the bearing ribs 61 extends from the wall portion axially to the first side. Each of the sensor ribs 51 and the bearing ribs 61 is solid and free of an oil channel guided therein.

[0058] The lubricating oil guide forms a first oil channel 71, a second oil channel 72 and a third oil channel 73, as in Fig. 4. The first oil channel 71 extends from the third oil channel 73 on the seal receiving portion 32 radially from the outside to the inside to the bearing portion 60. The third oil channel 73 extends from the groove in the seal receiving portion 32 axially on an outer circumference of the seal receiving portion 32 to the first side for an oil supply. The first oil channel 71 opens on an inner circumference of the bearing portion 60 in a region between the first bearing seat and the second bearing seat for supplying oil to the bearing of the input element 4 and the bearing of the first planetary carrier 12.

[0059] The second oil channel 72 fluidically connects two axially opposite sides of the second planet carrier 22. As a result, a space in the transmission housing in which the planetary gear sets 10, 20 are arranged is fluidically connected to a space in the transmission housing in which the electric motor is arranged. The second oil channel 72 extends in the axial direction through the wall section. The second oil channel 72 has a first opening region, a second opening region, and a third opening region. The first opening region is arranged in a lower region of the wall section in an installed position of the transmission in a horizontally oriented vehicle with respect to a direction of gravity. The second opening region is in a first circumferential direction, to the left in Fig. 4, offset from the first mouth area in the wall section. The third mouth area is in a second circumferential direction opposite to the first circumferential direction, to the right in Fig. 4, offset from the first orifice region in the wall section. The second orifice region and the third orifice region are arranged in the circumferential direction such that lubricating oil can flow through one of the orifices when the oil level changes, for example, during acceleration, deceleration, or tilting of the vehicle. In one embodiment, the second orifice region and the third orifice region can be positioned symmetrically with respect to the direction of gravity. In one embodiment, the first orifice region can be arranged further outward in the radial direction than the second and third orifices.

[0060] The second and third orifice regions are partially closed by a web. As a result, the second and third orifice regions each form two orifice openings arranged adjacent to one another in the circumferential direction. The web provides stiffening material in the wall section. The first oil channel 71 is arranged so as to overlap the third orifice region in the circumferential direction. Accordingly, the second planet carrier 22 is not excessively weakened here.

[0061] The recesses in the mouth areas are formed in the wall section by a curved elongated hole arranged concentrically to the rotation axis. The recesses in the mouth areas are aligned with corresponding support recesses 43 in the circumferential direction, as shown in Fig. 5 shown.

[0062] Fig. 6 to 8 show further perspective views of the first embodiment of the second planet carrier 22. Reference symbol 1 sun gear 4 Input element 5 First output shaft 6 Second output shaft 9 Stationary component 10 First planetary gear set 11 First sun gear 12 First planet carrier 13 First planetary bolt 14 First planetary gear 15 First ring gear 20 Second planetary gear set 21 Second sun gear 22 Planet carrier, Second planet carrier 23 Second planetary bolt 24 Second planetary gear 25 Second ring gear 30 connecting section 31 intervention section 32 Seal receiving section 40 support section 41 Planetary gear recess 42 Planetary bolt recess 43 Carrier recess 50 sensor section 51 Sensor rib 52 Sensor recess 60 storage section 61 Bearing rib 71 First oil channel 72 Second oil channel 73 Third oil channel 80 sensor element 91 Fastening element

Claims

[1] A transmission with an input element (4), at least one planetary gear set (20), a bearing for the input element (4), and a stationary component (9), wherein the planetary gear set (20) has a planet carrier (22) and at least one planet gear (24), wherein the planet carrier (22) has a connecting section (30) for rotationally fixed connection to the stationary component (9), a carrier section (40) for supporting the planet gear (24), a bearing section (60) for rotatably supporting the input element (4) on the planet carrier (22), and a wall section, wherein the wall section connects the connecting section (30), the carrier section (40), and the bearing section (60), wherein the bearing section (60) is arranged radially inward, wherein the planet carrier (22) forms a lubricating oil guide, wherein the lubricating oil guide forms a first oil channel (71) for oiling the bearing section (60),wherein the first oil channel (71) extends radially from the outside to the inside to the bearing section (60), and wherein the planet carrier (22) has at least one radially extending rib (51; 61) which stiffens a connection of the wall section to the bearing section (60). [2] Transmission according to claim 1, characterized by that the connecting section (30) is arranged radially outwardly of the support section (40) and the support section (40) is arranged radially outwardly of the bearing section (60). [3] Transmission according to one of the preceding claims, characterized by that the lubricating oil guide further comprises a second oil channel (72) which fluidically connects two axially opposite sides of the planet carrier (22). [4] Transmission according to claim 3, characterized byin that the second oil channel (72) has a first mouth region, a second mouth region and a third mouth region, wherein the first mouth region is arranged in a lower region of the wall section in an installed position of the transmission in a horizontally oriented vehicle, wherein the second mouth region is arranged offset from the first mouth region in the wall section in a first circumferential direction and the third mouth region is arranged offset from the first mouth region in the wall section in a second circumferential direction opposite to the first circumferential direction. [5] Transmission according to claim 4, characterized by that at least one of the first, second and third mouth regions has two mouth openings arranged next to one another in the circumferential direction. [6] Transmission according to one of the preceding claims, characterized bythat the transmission further comprises a sensor element (80), wherein the planet carrier (22) further comprises a sensor section (50) for fastening the sensor element (80), and wherein the sensor section (50) is arranged radially between the carrier section (40) and the bearing section (60). [7] Transmission according to one of the preceding claims, characterized by that the connecting section (30) has a plurality of engagement sections (31) spaced apart from one another in the circumferential direction, which engage with the stationary component (9) to provide the rotationally fixed connection. [8] Transmission according to one of the preceding claims, characterized by that the transmission has a sealing element, wherein the connecting section (30) has a seal receiving section (32) on which the sealing element is arranged, and wherein the sealing element seals the seal receiving section (32) with the stationary component (9). [9] Transmission according to one of the preceding claims, characterized by that the carrier section (40) has a planetary gear recess (41) which extends in the radial direction through the carrier section (40) and is designed to receive the planetary gear. [10] Transmission according to one of the preceding claims, characterized by that the bearing section (60) has a first bearing seat for supporting the input element (4) and a second bearing seat for supporting a rotary element of the transmission, and wherein the first bearing seat and the second bearing seat are arranged offset from one another in the axial direction. [11] Transmission according to one of the preceding claims, characterized byin that the transmission further comprises a first output shaft (5), a second output shaft (6), a first planetary gear set (10) and a second planetary gear set (20), wherein the second planetary gear set (20) forms the planetary gear set (20), the planet carrier (22) of which is connected in a rotationally fixed manner to the stationary component (9), wherein the input element (4) is mechanically operatively connected to the first planetary gear set (10) for inputting a torque into the transmission, wherein the first output shaft (5) is mechanically operatively connected to the first planetary gear set (10) for outputting a torque from the transmission, and wherein the second output shaft (6) is mechanically operatively connected to the second planetary gear set (20) for outputting a torque from the transmission. [12] Drive unit with a transmission according to one of the preceding claims and a drive machine with a rotor, wherein the rotor is mechanically operatively connected to an input element (4) of the transmission. [13] Vehicle with a drive unit according to claim 12 and at least a first output element and a second output element, wherein the first output shaft (5) is arranged to drive the first output element and the second output shaft (6) is arranged to drive the second output element.

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