Planetary gears for a motor vehicle as well as motor vehicles

Abstract

The invention relates to a planetary gear (12) for a motor vehicle, comprising a housing (14), a planet gear set (16) arranged in the housing (14), which includes a planet carrier (18), a parking lock gear (22) which is non-rotatably connected to and arranged on the planet carrier (18), the locking tooth area (26) of which is designed as a formed sheet metal part (34), and a parking lock device (36) which is designed to non-rotatably connect the parking lock gear (22) to the housing (14), wherein the planet carrier (18) is designed as an aluminum casting and has fastening elements (40) with receptacles (42) in which weld rivets (44) are arranged, by means of which the parking lock gear (22) is connected to the planet carrier (18).

Description

[0001] The invention relates to a planetary gear for a motor vehicle according to the preamble of patent claim 1. Furthermore, the invention relates to a motor vehicle with at least one such planetary gear.

[0002] DE 10 2011 081 884 A1 discloses a spur gear differential with several gears configured as spur gears, wherein torque can be transmitted from a first gear to a second gear, and the two gears are rotatably connected to a basket-like housing. It is also provided that a parking lock gear constructed from sheet metal is provided on the housing for locking the spur gear differential.

[0003] DE 10 2016 216 787 A1 shows a planetary gear with the features of the preamble of patent claim 1. Furthermore, the document REINHARDT, Rudolf: "Welded riveting - a method for joining dissimilar materials" in: Proceedings / 22nd DVS Special Conference on Resistance Welding, June 11-12, 2013, 10 pp. URL: https: / / www.researchgate.net / publication / 265058010.Schweissnieten_-_ein_Verfahren_zum_Fugen_artfremder_Werkstoffe [accessed on November 27, 2024] shows how components can be joined together using welded rivets. DE 10 2008 014 105 A1 shows a bell-shaped hub for a planetary gear with a planetary carrier designed for optimal manufacturing. DE 10 2011 003 765 A1 shows a planetary gear with a favorable design for assembly. DE 10 2007 023 952 A1 shows a planetary gear with an oil drip tray on a planetary carrier.

[0004] The object of the present invention is to provide a planetary gear for a motor vehicle and a motor vehicle with at least one such planetary gear so that a parking lock can be realized in a particularly weight-efficient manner.

[0005] This object is achieved by a planetary gear having the features of patent claim 1 and by a motor vehicle having the features of patent claim 9. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0006] A first aspect of the invention relates to a planetary gear system for a motor vehicle, also simply referred to as a vehicle. This means that the motor vehicle, in its fully manufactured state, has the planetary gear system. For example, in its fully manufactured state, the motor vehicle has at least one drive motor, by means of which the motor vehicle, in particular vehicle wheels of the motor vehicle, can be driven via the planetary gear system. The planetary gear system has a housing and a planetary gear set arranged in the housing. The planetary gear set has a planet carrier, also referred to as a web, which is rotatable about an axis of rotation relative to the housing, in particular when the planet carrier is not connected to the housing in a rotationally fixed manner.The planetary gear set has a parking lock gear that is connected, in particular permanently and rotationally fixedly, to the planet carrier and arranged, in particular directly, on the planet carrier. In particular, the parking lock gear is a component of a parking lock of the planetary gear set, the parking lock of which will be explained in more detail below. The parking lock gear set has a locking toothing region. The locking toothing region is or comprises a locking toothing of the parking lock gear, also referred to as the first toothing. The locking toothing region and thus the locking toothing of the parking lock gear set are designed as a formed sheet metal part, thus formed by a formed sheet metal part. The sheet metal part is preferably designed as a single piece, thus formed from a single piece.This means that the sheet metal part is preferably not composed of several parts that are formed separately from one another and connected to one another, but rather the sheet metal part that forms the locking toothing area and thus the locking toothing is preferably formed from a single piece and is thus designed as a monoblock or formed by a monoblock.

[0007] The planetary gear train also has a parking lock device, which is, for example, a further component of the parking lock. The parking lock device is designed to connect the parking lock gear, in particular in a form-fitting manner, to the housing in a rotationally fixed manner. In other words, the parking lock device can be connected to the housing in a rotationally fixed manner by means of the parking lock device. This means, in particular, that the parking lock device can be switched between a coupled state and a decoupling state. In the coupled state, the parking lock gear is connected to the housing in a form-fitting manner, in particular in a form-fitting manner, in particular in that, in the coupled state, the parking lock device engages in the locking toothing region, i.e., in the locking toothing, and thereby interacts positively with the parking lock gear.In the uncoupled state, the parking lock device releases the parking lock gear for rotation, in particular about the rotational axis and relative to the housing, so that in the uncoupled state, the parking lock gear is rotatable, in particular about the rotational axis relative to the housing. Thus, it is particularly provided that in the uncoupled state, a positive engagement between the parking lock device and the locking toothing region, thus the locking toothing, is eliminated, in particular by, for example, the parking lock device not engaging in the locking toothing region, i.e., not engaging in the locking toothing, in the uncoupled state.Since the parking lock gear is connected, in particular permanently, in a rotationally fixed manner to the planet carrier, in the coupled state, the parking lock gear and thus the potential, in particular positively, connected to the housing by means of the parking lock device, in particular in that in the coupled state the parking lock device engages in the locking toothing, i.e. in the locking toothing region, and thus interacts positively with the locking toothing, i.e. with the locking toothing region. In the uncoupled state, the parking lock gear and thus the planet carrier are rotatable about the axis of rotation relative to the housing, since, for example, in the uncoupled state, a positive interaction between the parking lock device and the locking toothing region, i.e. the locking toothing, is eliminated.

[0008] The parking lock device is or comprises, for example, a locking pawl, also referred to as a parking lock pawl. The locking pawl is movable, for example, relative to the housing between at least one coupling position bringing about the coupling state and at least one decoupling position bringing about the decoupling state, in particular pivotable about a pivot axis. The pivot axis preferably runs perpendicular, obliquely, or parallel to the rotation axis. This is to be understood in particular as the following: the rotation axis runs, for example, perpendicular to a first plane, and the pivot axis runs, for example, perpendicular to a second plane, wherein it is conceivable for the planes to run parallel, obliquely, or perpendicular to one another.The feature that the coupling position brings about the coupling state and the uncoupling position brings about the uncoupling state is to be understood that the parking lock device is in the coupling state when the pawl is in the coupling position, and that the parking lock device is in the uncoupling state when the pawl is in the uncoupling position. Thus, it is particularly provided that in the coupling position, also referred to as the locking position, the pawl engages in the locking toothing area, i.e., in the locking toothing, and thereby interacts in a form-fitting manner with the locking toothing area, i.e., with the locking toothing, so that in the coupling position and thus in the coupling state, the parking lock gear and thus the planet carrier are connected, in particular in a form-fitting manner, to the housing by means of the pawl in a rotationally fixed manner.In the uncoupling position and thus in the uncoupling state, there is no positive engagement between the locking pawl and the locking toothing area, i.e., the locking toothing, for example, by the locking pawl not engaging the locking toothing area, i.e., the locking toothing, in the uncoupling position. Thus, in the uncoupling position, the locking pawl releases the parking lock gear and the planet carrier for rotation around the rotational axis and relative to the housing.

[0009] In the coupled state, the parking lock is engaged, i.e. activated, and in the uncoupled state, the parking lock is disengaged, i.e. deactivated. By means of the activated parking lock, the motor vehicle can be secured against unwanted rolling away, particularly when the motor vehicle is parked on an incline, for example. The disengaged, i.e. deactivated parking lock releases the motor vehicle to roll. In particular, it is provided that, for example, the planet carrier is connected or connectable to the aforementioned vehicle wheels of the motor vehicle in a torque-transmitting, in particular rotationally fixed, manner. In particular, it is conceivable that the planet carrier is permanently connected to the vehicle wheels in a torque-transmitting, in particular rotationally fixed, manner.The vehicle wheels are ground contact elements of the motor vehicle, which can be or is supported on a ground via the ground contact elements in the vertical direction of the vehicle. If the motor vehicle is driven along the ground while being supported on the ground via the ground contact elements in the vertical direction of the vehicle, the ground contact elements roll, in particular directly, on the ground. If the parking lock is engaged while the planet carrier is connected to the vehicle wheels in a torque-transmitting, in particular rotationally fixed, manner, the vehicle wheels are secured against rotation relative to the housing, whereby the motor vehicle is secured against rolling away. If the parking lock is disengaged, the vehicle wheels can be rotated relative to the housing, allowing the motor vehicle to roll.Thus, it is provided in particular that, particularly when the vehicle wheels are connected to the planetary carrier in a torque-transmitting, in particular rotationally fixed manner, in the coupled state by means of the parking lock and thus by means of the parking lock gear and by means of the parking lock device, the vehicle wheels are rotationally fixedly connected to the housing.

[0010] In order to realize the parking lock with particularly low weight, the invention provides for the planetary carrier to be designed, i.e., formed, as a cast aluminum part. Furthermore, the planetary carrier has fastening elements. Each fastening element has at least one or precisely one receptacle. Welded rivets are arranged in the receptacles, by means of which the parking lock gear, which is formed separately from the planetary carrier, is connected to the planetary carrier.In particular, the parking lock gear, which is formed separately from the planetary carrier, is connected to the planetary carrier by means of the weld rivet in such a way that the parking lock gear is connected to the planetary carrier in a rotationally fixed manner. Furthermore, it is conceivable, in particular additionally, that the parking lock gear is connected to the planetary carrier by means of the weld rivet in such a way that relative movements between the parking lock gear and the planetary carrier in the axial direction of the planetary gear are prevented. The axial direction of the planetary gear, whose radial direction runs perpendicular to the axial direction of the planetary gear, coincides with the aforementioned axis of rotation.

[0011] By designing the planetary carrier as a cast aluminum part, the weight of the planetary carrier itself and thus the weight of the planetary carrier as a whole can be kept particularly low. Since the parking lock gear is formed separately from the planetary carrier, and since the locking toothing area is formed as a formed sheet metal part formed separately from the planetary carrier, particularly advantageous, particularly mechanical, properties of the sheet metal part and thus of the locking toothing area can be realized, in particular in that an advantageous hardness, in particular surface hardness, and an advantageous toughness of the locking toothing area can be achieved.

[0012] The parking lock gear has the locking toothing area and thus the formed sheet metal part, so that the fact that the parking lock gear is formed separately from the planet carrier and is connected to the planet carrier in a rotationally fixed manner means that the sheet metal part and thus the locking toothing area are formed separately from the planet carrier and are connected to the planet carrier in a rotationally fixed manner. Thus, it is particularly provided that the sheet metal part and thus the locking toothing area are connected to the planet carrier by means of the weld rivet, in particular in such a way that the sheet metal part and the locking toothing area are connected, in particular permanently, in a rotationally fixed manner to the planet carrier and in particular in such a way that relative movements occurring in the axial direction of the planetary gear between the sheet metal part and the planet carrier, and thus between the locking toothing area and the planet carrier, are prevented.Furthermore, by designing the locking toothing area as the formed sheet metal part, the weight of the parking lock gear can also be advantageously kept low.

[0013] In the context of the present disclosure, the feature “radially overlapping” is to be understood as follows: Two elements, in particular those that are at least substantially rotationally symmetrical, are arranged radially, in particular overlapping one another, in particular with respect to a common axis that runs, for example, in the radial direction of the planetary gear system and / or in the radial direction of the planetary gear system, if they are each arranged at least partially in a region of the same radial coordinates, in particular the same angular coordinates. The term “radial” refers to the radial direction of the planetary gear system. In other words, the term “radial” means the radial direction of the planetary gear system. When reference is made above and below to the radial direction, this means the radial direction of the planetary gear system, unless otherwise stated.

[0014] The feature "axially overlapping" is to be understood as follows: Two elements are arranged axially overlapping, in particular with respect to one another, with respect to a common axis, in particular running in the axial direction of the planetary gear system, and / or in the axial direction of the planetary gear system, if they are each arranged at least partially in a region of the same axial coordinates. In the context of the present disclosure, the term "axial" is to be understood as the axial direction of the planetary gear system. In other words, the term "axial" means the axial direction of the planetary gear system. Expressed again in other words, "axial" refers to the axial direction of the planetary gear system, and "radial" refers to the radial direction of the planetary gear system. When reference is made above and below to the axial direction, this means the axial direction of the planetary gear system, unless otherwise stated.

[0015] In the context of the present disclosure, the feature that a first component is arranged radially within a second component is to be understood as meaning that the first component is arranged in a region of smaller radii than the second component, in particular with respect to the axis of rotation.Furthermore, the feature that a first component is arranged axially within a second component is to be understood as meaning that in the installed position of the planetary gear, which assumes its installed position in the fully manufactured state of the motor vehicle having the planetary gear, the first component, which is arranged axially within the second component, is arranged on one side of the second component towards a centre of the motor vehicle, also referred to as the vehicle centre, and thus the first component is arranged on a side of the second component pointing towards the centre of the motor vehicle, so that the first component is arranged further inside, i.e. closer to the centre of the motor vehicle, than the second component, in particular when viewed in the transverse direction of the vehicle and / or in the longitudinal direction of the vehicle.

[0016] In the context of the present disclosure, the feature that two components, such as the planet carrier and the parking lock gear, are connected to one another in a rotationally fixed manner, is to be understood as meaning that the components connected to one another in a rotationally fixed manner are arranged coaxially to one another and, in particular when the components are driven, rotate together or simultaneously about a component rotation axis common to the components, such as the rotation axis, at the same angular velocity, in particular relative to a reference element, such as the housing. In other words, two elements are connected to one another in a rotationally fixed manner if they are arranged coaxially to one another, in particular with respect to their component rotation axis or with respect to a rotational symmetry axis, and if they are connected to one another in such a way that they always rotate at the same angular velocity.An element is connected to the housing in a rotationally fixed manner if it cannot be rotated relative to the housing.

[0017] The feature that two components, such as the planetary carrier and the respective vehicle wheel, are connected or coupled to one another in a torque-transmitting manner means that the components are coupled or connected to one another in such a way that torque can be transmitted between the components. If the components are connected or coupled to one another in a rotationally fixed manner, the components are also connected or coupled to one another in a torque-transmitting manner. Two components connected to one another in a torque-transmitting manner can thus be connected to one another in a rotationally fixed manner.Furthermore, it is conceivable that two components connected to one another in a torque-transmitting manner are connected to one another in a torque-transmitting manner via an intermediate transmission and / or coupling unit, so that torques can be transmitted between the components via the transmission and / or coupling unit, while the components are connected to one another in a torque-transmitting manner, wherein the components can, however, be rotatable relative to one another.

[0018] The feature that two components are permanently connected or coupled to one another in a torque-transmitting manner does not mean that a switching element is provided that can be switched between a coupling state that connects or couples the components to one another in a torque-transmitting manner and a decoupling state in which no torque can be transmitted between the components via the switching element. Rather, the components are always and therefore permanently torque-transmitting, i.e., connected or coupled to one another in such a way that torque can be transmitted between the components. For example, at least one of the components can be driven by the other component, or vice versa.

[0019] In particular, the feature that two components are permanently connected or coupled to one another in a rotationally fixed manner is to be understood as meaning that a switching element is not provided which can be switched between a coupling state that connects and couples the components to one another in a rotationally fixed manner and a decoupling state in which the components are decoupled from one another and rotatable relative to one another, so that no torque can be transmitted between the components via the switching element. Instead, the components are always, and therefore permanently, connected or coupled to one another in a rotationally fixed manner. Furthermore, the feature that two components can be connected or coupled to one another in a rotationally fixed manner is to be understood as meaning that the components are assigned a switching element which can be switched between at least one coupling state and at least one decoupling state.In the coupled state, the components are connected or coupled to one another in a rotationally fixed manner by means of the switching element. In the uncoupled state, the components are decoupled from one another such that in the uncoupled state the components can be rotated relative to one another about the component rotation axis. The same applies to the feature that two components can be connected or coupled to one another in a torque-transmitting manner. Thus, for example, the feature that two components can be connected or coupled to one another in a torque-transmitting manner is to be understood as meaning that a switching element is assigned to the components, wherein the switching element can be switched between at least one connected state and at least one released state. In the connected state, the components are coupled or connected to one another in a torque-transmitting manner by means of the switching element such that torques can be transmitted between the components, in particular via the switching element.In the release state, the components are decoupled from each other, so that in the release state no torque can be transmitted between the components via the switching element.

[0020] The feature that two elements are formed in one piece with each other is to be understood as meaning that the elements are not formed separately from each other and connected to each other, but the elements are formed from a single piece and thus integrally, that is to say formed in one piece, so that the elements are formed by a body that is formed in one piece, thus formed from a single piece and thus manufactured integrally and thus formed as a monoblock.

[0021] Furthermore, the invention is characterized by a spline designed to connect the planet carrier in a rotationally fixed manner to the parking lock gear. In other words, it is preferably provided that the planet carrier is connected in a rotationally fixed manner to the parking lock gear by means of the spline, in particular in a form-fitting manner. This makes it possible to realize a particularly lightweight design of the planetary gear. The spline has, for example, a second toothing on the parking lock gear side, which thus represents a second toothing of the parking lock gear. In particular, the second toothing is provided in addition to the first toothing. Furthermore, the spline has a third toothing on the planet carrier side, corresponding to the second toothing, which thus represents a third toothing of the planet carrier.The second toothing and the third toothing engage with each other and thus interact in a form-fitting manner, whereby the planet carrier and the parking lock gear are connected to each other in a rotationally fixed manner, in particular in a form-fitting manner.

[0022] Within the scope of the present disclosure, ordinal numerals such as "first," "first," "first," "second," "second," "second," etc., also referred to as ordinals, are not necessarily used to indicate a number of elements to which the ordinal numerals refer. Rather, within the scope of the present disclosure, ordinal numerals are used primarily and at least to be able to refer unambiguously and consistently to elements to which the ordinal numerals refer. Thus, for example, the parking lock gear-side toothing of the spline toothing can be referred to as the first toothing and the planet carrier-side toothing of the spline toothing can be referred to as the second toothing, in which case, for example, the locking toothing can be referred to as the third toothing.

[0023] In order to be able to realize a particularly weight and space-efficient design of the planetary gear, it is provided in a further development of the invention that a first set of planet gears and a second set of planet gears are arranged on the planet carrier. The planet gears of the first set, or the planet gears forming the first set, are also referred to as first planet gears, and the planet gears of the second set, i.e. the planet gears forming the second set, are also referred to as second planet gears. In particular, the first planet gears and the second planet gears are rotatably held on the planet carrier. It is provided that the spline teeth are arranged axially, i.e. in the axial direction of the planetary gear and thus viewed along the axis of rotation, between the first set of planet gears and the second set of planet gears.

[0024] A further embodiment is characterized by planetary gear bolts. In particular, the first planetary gears and the second planetary gears are rotatably held, in particular mounted, on the planetary gear bolt. The respective planetary gear bolt has an axial first channel, which thus runs in the axial direction of the respective planetary gear bolt. In addition, the respective planetary gear bolt has a radial second channel, which runs in the radial direction of the respective planetary gear bolt. The respective second channel is fluidically connected to the respective first channel. A lubricant and / or coolant, in particular a liquid one, which is designed as an oil, for example, can flow through the respective first channel and the respective second channel. The planetary gear bolts are arranged on the planet carrier, in particular in such a way that the respective planetary gear bolt is connected, in particular permanently, to the planet carrier in a rotationally fixed manner.

[0025] An oil baffle is preferably provided, which is arranged axially adjacent to the planetary gear pins. Furthermore, it is preferably provided that the oil baffle is arranged radially, partially overlapping the planetary gear pins. The oil baffle is formed integrally with the sheet metal part, in particular the parking lock gear, so that the sheet metal part preferably also forms the oil baffle. This allows for a particularly space- and weight-efficient design of the planetary gear.

[0026] It has proven particularly advantageous if the oil baffle has a cylindrical section. The cylindrical section is understood to be a section of the oil baffle whose section is cylindrical at least on the outer circumference and preferably also on the inner circumference. Preferably, the oil baffle also has a plate section, wherein the cylindrical section is arranged radially outside the planetary gear pins, and wherein the plate section is arranged radially partially overlapping the planetary gear pins. This allows for a particularly weight- and space-efficient design of the planetary gear.

[0027] In order to be able to keep the weight of the planetary gear particularly low, it is provided in a further embodiment of the invention that the respective first channel and the respective second channel are designed as a respective bore and are thus produced by machining.

[0028] In the context of the present disclosure, a bore is understood to mean a bore produced by machining, that is to say a bore produced by machining drilling.

[0029] A further embodiment is characterized in that the respective receptacle is designed as a respective bore, whereby a particularly cost- and weight-effective construction of the planetary gear can be realized.

[0030] In a further, particularly advantageous embodiment of the invention, the sheet metal part is made of steel. This allows particularly advantageous, particularly mechanical, properties of the sheet metal part and thus of the locking toothing area to be realized in a particularly weight-efficient manner.

[0031] Finally, it has proven particularly advantageous if at least the locking teeth, and thus at least the locking tooth area, is hardened. This allows particularly advantageous mechanical properties of the locking tooth area and thus of the parking lock gear to be achieved in a particularly weight-efficient manner.

[0032] A second aspect of the invention relates to a motor vehicle, also referred to simply as a vehicle, and preferably designed as a motor vehicle, in particular as a passenger car, which has at least one planetary gear according to the first aspect of the invention. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0033] Further advantages, features, and details of the invention will become apparent from the following description of preferred embodiments and from the drawings. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respective specified combinations, but also in other combinations or on their own, without departing from the scope of the invention.

[0034] The drawing shows: Fig. 1 a schematic perspective view of a structural unit of a planetary gear according to a first embodiment, wherein the structural unit comprises a planet carrier and a parking lock gear formed separately from the planet carrier and, in particular permanently, connected to the planet carrier in a rotationally fixed manner; Fig. 2 is a schematic front view of the planetary gear according to the first embodiment; Fig. 3 shows a partial schematic longitudinal sectional view of the planetary gear according to the first embodiment; and Fig. 4 shows a partial schematic longitudinal sectional view of a second embodiment of the planetary gear.

[0035] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0036] Fig. 1 shows a schematic perspective view of a structural unit 10 of a planetary gear 12 ( Fig. 2) according to a first embodiment, wherein the first embodiment in Fig. 1 to 3. As can be seen from a summary of Fig. 1 to 3, the planetary gear 12 has a housing 14 and a planetary gear set 16 arranged in the housing 14. The planetary gear set 16 has a planet carrier 18, which is rotatable about a rotational axis 20 relative to the housing 14, particularly when the planet carrier 18 is not connected in a rotationally fixed manner to the housing 14. In particular, the planetary gear set 16 has a sun gear (not shown in the figures). The sun gear is, for example, rotatable about the rotational axis 20 relative to the housing 14. For example, the planetary gear set 16 can have a ring gear (not shown in the figures). The ring gear can be rotatable about the rotational axis 20. Or the ring gear is, in particular permanently, connected in a rotationally fixed manner to the housing 14. Fig. 1 shows that the assembly 10 includes the planetary carrier 18, which is thus a first component of the assembly 10. The assembly 10 also includes a parking lock gear 22, which is thus a second component of the assembly 10.

[0037] In particular, the parking lock wheel 22 is a component of a parking lock 24, which Fig. 3. The parking lock gear 22 is formed separately from the planet carrier 18 and is connected, in particular permanently, in a rotationally fixed manner to the planet carrier 18. In addition, the parking lock gear 22 is arranged, in particular directly, on the planet carrier 18. The parking lock gear 22 has a locking toothing region 26, which is or comprises a locking toothing 28 of the parking lock gear 22. Particularly well Fig. 1 that the locking toothing 28 and thus the locking toothing region 26 has a plurality of teeth 30 which are spaced apart from one another and arranged one after the other in the circumferential direction of the parking lock gear 22 running around the rotational axis 20, so that a respective tooth gap 32 of the locking toothing 28 is arranged, in particular exactly, between each two teeth 30 which are adjacent to one another in the circumferential direction of the parking lock gear 22 and thus directly following one another.

[0038] The locking toothing region 26 and thus the locking toothing 28 are formed as a formed sheet metal part 34, i.e., formed by the formed sheet metal part 34. The sheet metal part 34 is formed separately from the planet carrier 18 and, in particular, is permanently connected to the planet carrier 18 in a rotationally fixed manner.

[0039] The parking lock 24 and thus the planetary gear 12 also has a parking lock device 36, which is, for example, or comprises a pawl 38, also referred to as a parking lock pawl. The parking lock device 36, i.e., in this case, the pawl 38, is designed to connect the parking lock gear 22 and thus the planetary carrier 18 in a rotationally fixed manner to the housing 14. The pawl 38 is movable, in particular pivotable, relative to the housing 14 and also relative to the locking toothing 28, i.e., relative to the locking toothing region 26, between at least one coupling position and at least one uncoupling position. The locking toothing region 26 and the locking toothing 28 are to be understood as synonymous. In the coupling position, the pawl 38 engages in the locking teeth 28, whereby in the coupling position the pawl 38 interacts positively with the parking lock gear 22.As a result, the parking lock gear 22 and thus the planet carrier 18 are positively connected to the housing 14 in a rotationally fixed manner. In the uncoupling position, there is no positive interaction between the parking lock device 36 and the parking lock gear 22, in particular because, in the uncoupling position, the locking pawl 38 does not engage the locking teeth 28. As a result, in the uncoupling position, the parking lock gear 22 and thus the planet carrier 18 are rotatable about the rotation axis 20 relative to the housing 14.

[0040] In order to achieve a particularly lightweight design for the planetary gear 12, the planet carrier 18 is designed, i.e., formed, as a cast aluminum part. Furthermore, the planet carrier 18 has fastening elements 40. The fastening elements 40 are spaced apart from one another and arranged sequentially around the rotational axis 20 in the circumferential direction of the planet carrier 18, whose circumferential direction coincides with the circumferential direction of the parking lock gear 22. It is conceivable for the fastening elements 40 to be evenly distributed in the circumferential direction of the planet carrier 18. Each fastening element 40 has a respective receptacle 42, which is designed, for example, as a respective bore.For example, the respective receptacle 42 is designed as a respective through-opening that, for example, completely penetrates the respective fastening element 40 in the axial direction of the planetary gear 12, the radial direction of which runs perpendicular to the axial direction of the planetary gear 12. The axial direction of the planetary gear 12 coincides with the axis of rotation 20. A respective weld rivet 44 is arranged in the respective receptacle 42. The parking lock gear 22, which is formed separately from the planet carrier 18, is connected to the planet carrier 18 by means of the weld rivet 44.

[0041] The parking lock gear 22 advantageously has a wheel-side fastening element 41, which rests against the fastening element 40 and is connected to the fastening element 40 by means of the weld rivet 44. The wheel-side fastening element 41 is connected in a rotationally fixed and axially fixed manner to the locking toothing 28. Advantageously, the wheel-side fastening element 41 is formed integrally with the locking toothing 28. Advantageously, the formed sheet metal part 34 has the wheel-side fastening element 41.

[0042] Out of Fig. 2 shows that the planetary gear 12 has a spline 45, by means of which the planet carrier 18 is connected in a rotationally fixed manner to the parking lock gear 22. For this purpose, the spline 45 has a first toothing 46 of the parking lock gear 22 on the parking lock side and a second toothing 48 of the planet carrier 18 on the planet carrier side, corresponding to the first toothing 46, wherein the toothings 46 and 48 mesh with one another. It is preferably provided that the toothing 46 of the parking lock gear 22 is formed by the formed sheet metal part 34.

[0043] A first set of planetary gears and a second set of planetary gears are arranged on the planet carrier 18. For example, in Fig. 2 shows the second set of planetary gears, the second set of planetary gears being designated 50. The planetary gears forming the second set of planetary gears are also referred to as second planetary gears and are in Fig. 2 with 52. It is preferably provided that the spline 45 is arranged in the axial direction of the planetary gear 12 and thus, viewed along the axis of rotation 20, between the first set of planet gears and the second set 50 of the second planet gears 52. The previous and following explanations regarding the second set can readily be applied to the first set, and the previous and following explanations regarding the second planet gears 52 can readily be applied to the planet gears of the first set, wherein the planet gears forming the first set of planet gears are also referred to as first planet gears. Using the example of the second planet gears 52, it can be seen that the respective second planet gear 52 is held, in particular mounted, on the respective planet gear pin 56 so as to be rotatable about a respective planetary axis of rotation 54 relative to a respective planet gear pin 56.For example, the planetary gear pins 56 are formed separately from the planetary carrier 18 and arranged on the planetary carrier 18, in particular such that the respective planetary gear pin 56 is connected, in particular permanently, in a rotationally fixed manner to the planetary carrier 18. This can be seen from . Fig. 3 is that the respective planetary rotational axis 54 runs parallel to the rotational axis 20 and is spaced from the rotational axis 20. In particular, the planetary rotational axes 54 are arranged on a circle whose center lies on the rotational axis 20.

[0044] Fig. 4 shows a second embodiment of the planetary gear 12. In the second embodiment, an oil baffle 58 is arranged axially adjacent to and radially partially overlapping the planetary gear pins 56, wherein the oil baffle 58 is formed integrally with the sheet metal part 34, i.e., is formed by the sheet metal part 34. Thus, in the present case, the oil baffle 58 is formed integrally with the parking lock gear 22.

[0045] The oil baffle 58 has a cylindrical section ZA and a plate section TA. The cylindrical section ZA is cylindrical, for example, at least on the outer circumference and preferably also on the inner circumference, so that, for example, the cylindrical section TA has the shape of a right circular cylinder on the inner circumference and preferably also on the outer circumference, the cylinder center axis of which coincides with the axis of rotation 20. For example, the plate section TA runs in a plane that is perpendicular to the cylinder center axis and thus perpendicular to the axis of rotation 20, also referred to as the main axis of rotation. The plate section TA is arranged radially, partially overlapping the planet gear bolts 56. The oil baffle 58 has a catch section 60, which runs obliquely to the plate section TA and obliquely to the cylindrical section ZA.In particular, for example, the catching section 60 is conical, so that, for example, the catching section 60 has the shape of a cone which, for example, tapers away from the planetary gear bolt 56 or widens in the direction of the planetary gear bolt.

[0046] Recognizable from Fig. 1, that the respective planetary gear pin 56 has a respective axial first channel K1 and a respective second radial channel K2, which is fluidically connected to the respective first channel K1. The respective channels K1 and K2 of the respective planetary gear pin 56 can be flowed through by a particularly liquid coolant and / or lubricant, which in Fig. 4 is illustrated by an arrow 62. For example, during operation of the planetary gear 12, during which operation the planet carrier 18 rotates about the axis of rotation 20 relative to the housing 14, the coolant and / or lubricant is thrown outwards from the planet carrier 18 in the radial direction of the planetary gear 12 and / or during operation the coolant and / or lubricant flows outwards along the planet carrier 18 in the radial direction of the planetary gear 12. The coolant and / or lubricant thrown outwards from the planet carrier 18 and / or flowing outwards in the radial direction is collected by the oil collecting plate 58, in particular by the collecting section 60, and guided to and into the respective first channel K1.The lubricant and / or coolant guided to and into the respective first channel K1 can flow along the respective channel K1 and thus in the axial direction of the respective planetary gear bolt 56 and flow from the respective channel K1 into the respective channel K2. The coolant and / or lubricant flowing into the respective channel K2 can flow outwards along the respective channel K2 and thus in the radial direction of the planetary gear 12. For example, the coolant and / or lubricant flowing through the channels K1 and K2 supplies a respective bearing, by means of which, for example, the respective planetary gear 52 is rotatably mounted on the respective planetary gear bolt 56, whereby the bearing can be lubricated and / or cooled. A respective toothing of the respective planetary gear 52 is shown in FIG. Fig.4, designated 64. It can be seen that the respective planetary gear 52 has a respective third channel K3, which runs in the radial direction of the respective planetary gear 52 and thus of the respective planetary gear bolt 56 and thus in the radial direction of the planetary gear 12 and in particular completely penetrates the respective toothing 64 in the radial direction. The respective third channel K3 is fluidically connected to the respective second channel K2 and thus the coolant and / or lubricant can flow through it, in particular in the radial direction of the planetary gear 12, to the outside. Thus, for example, alternatively or additionally, the respective toothing 64 can be supplied with the coolant and / or lubricant and thereby cooled and / or lubricated.The respective toothing 64 meshes, for example, with a corresponding toothing of the aforementioned ring gear of the planetary gear set 16, whereby, for example, alternatively or additionally, the toothing of the ring gear can be supplied with the coolant and / or lubricant and thus cooled and / or lubricated.

[0047] Preferably, the sheet metal part 34 is hardened at least in the locking toothing area 26. For example, on an inner side S1 facing inward in the radial direction of the planetary gear 12, the toothing 46 of the parking lock gear 22 engages with the corresponding toothing 48 of the planet carrier 18, thereby rotationally connecting the parking lock gear 22, which is formed separately from the planet carrier 18, to the planet carrier 18. For example, the parking lock gear 22 is centered on and relative to the planet carrier 18 via its inner diameter.

[0048] In order to be able to mount the planet gears 52, for example, the planet carrier 18 has through openings 66, also referred to as windows, which penetrate the planet carrier 18 in the radial direction of the planetary gear 12, in particular completely. For example, the windows are punched, in particular radially. The respective planet gear 52 can be moved in the radial direction of the planetary gear 12, in particular from the outside to the inside, through the respective window and subsequently mounted. An axial stop of the respective planet gear 52 on the planet carrier 18 occurs, for example, on a base 68 of the planet carrier 18. In particular, it is possible to add the parking lock gear 22 when the planetary gear set 16 is completely and thus fully assembled, and thus to connect it to the planet carrier 18.The respective weld rivet 44 can be countersunk, thereby achieving a particularly space-efficient design, particularly in the axial direction of the planetary gear 12. The spline 45 is, for example, free of play because the teeth of the gear 46 and the teeth of the gear 48 are conical. Thus, for example, the gears 46, 48 form a free of play pair of gears, which is free of play because the teeth of the gear 46 and the teeth of the gear 48 are conical, thus extending conically, particularly in the radial direction of the planetary gear 12.

[0049] The toothing 46 of the sheet metal part 34 and thus of the parking lock gear 22 is produced, for example, by punching, in particular in the radial direction from the inside to the outside. This allows each tooth of the toothing 46 to be produced conically, in particular by a break-off portion during punching, which amounts, for example, to two-thirds of a tooth length. As a result, each tooth of the toothing 46 has a bevel, which can also be produced on the respective tooth of the toothing 48, in particular by casting, by which the planet carrier 18 is produced. The casting is preferably a die-casting process, so that the planet carrier 18 is preferably designed as an aluminum die-cast part.By means of the weld rivets 44, for example, the conical teeth of the toothing 46 can be drawn into corresponding, conical tooth gaps in the toothing 48; conversely, the conical teeth of the toothing 48 can be drawn into corresponding conical tooth gaps in the toothing 46. As a result, the spline 45 can be formed at least substantially free of play. Preferably, the receptacle 42 for the respective weld rivet 44 is conical, particularly when viewed in the axial direction of the planetary gear 12, and thus extends conically, in order to realize an axial pull and thus move the teeth of the toothing 46 into the tooth gaps in the toothing 48 and the teeth of the toothing 48 into the tooth gaps in the toothing 46, particularly in the radial direction of the planetary gear 12.For example, a small depression is embossed at a welding point of the parking lock 24 so that a welding plane does not lie in a plane of a contact surface. List of reference symbols 10 building units 12 planetary gears 14 housings 16 planetary gear set 18 planet carriers 20 axis of rotation 22 Parking lock gear 24 Parking lock 26 Locking tooth area 28 locking teeth 30 teeth 32 tooth gap 34 sheet metal part 36 Parking lock device 38 pawl 40 Fastening element 41 Wheel-side fastening element 42 recording 44 weld rivet 45 spline 46 first gearing 48 second gearing 50 second set of planetary gears 52 Planetary gear 54 Planetary rotation axis 56 planetary gear bolts 58 Oil drip plate 60 catch section 62 Arrow 64 Gearing 66 passage opening 68 Floor K1 first channel K2 second channel K3 third channel S1 inside TA plate section ZA cylinder section

Claims

[1] Planetary gear (12) for a motor vehicle, comprising a housing (14), a planetary gear set (16) arranged in the housing (14), which planetary gear set comprises a planet carrier (18), a parking lock gear (22) which is connected in a rotationally fixed manner to the planet carrier (18) and arranged on the planet carrier (18), the locking toothing region (26) of which is designed as a formed sheet metal part (34), a parking lock device (36) which is designed to connect the parking lock gear (22) in a rotationally fixed manner to the housing (14), characterized by in that the planet carrier (18) is designed as an aluminum casting and has fastening elements (40) with receptacles (42) in which weld rivets (44) are arranged, by means of which the parking lock gear (22) is connected to the planet carrier (18), wherein a spline (45) is designed to connect the planet carrier (18) to the parking lock gear (22) in a rotationally fixed manner. [2] Planetary gear (12) according to claim 1, characterized bythat a first set of planetary gears and a second set (50) of planetary gears (52) are arranged on the planet carrier (18), wherein the spline toothing (45) is arranged axially between the first set of planetary gears and the second set (50) of planetary gears (52). [3] Planetary gear (12) according to one of the preceding claims, characterized by Planetary gear bolts (56), each having an axial first channel (K1) and a radial second channel (K2) fluidically connected to the respective first channel (K1) and arranged on the planet carrier (18), wherein an oil collecting plate (58) is arranged axially adjacent to and radially partially overlapping the planetary gear bolts (56) and is formed integrally with the sheet metal part (34). [4] Planetary gear (12) according to claim 3, characterized byin that the oil collecting plate (58) has a cylinder section (ZA) and a plate section (TA), wherein the cylinder section (ZA) is arranged radially outside the planetary gear bolts (56), and wherein the plate section (TA) is arranged radially partially overlapping the planetary gear bolts (56). [5] Planetary gear (12) according to claim 3 or 4, characterized by that the respective first channel (K1) and the respective second channel (K2) are formed as a respective bore. [6] Planetary gear (12) according to one of the preceding claims, characterized by that the respective receptacle (42) is designed as a respective bore. [7] Planetary gear (12) according to one of the preceding claims, characterized by that the sheet metal part (34) is made of steel. [8] Planetary gear (12) according to one of the preceding claims, characterized by that at least the locking tooth area (26) is hardened. [9] Motor vehicle, with at least one planetary gear (12) according to one of the preceding claims.

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