Differential transmission for vehicle and drive unit comprising electric machine and differential transmission

Abstract

The invention relates to a differential transmission (1) for a vehicle (100), comprising: a drive shaft (2) designed to be operatively drivingly connected to an electric machine (3); a first output shaft (4.1) and a second output shaft (4.2), each configured to be operatively drivingly connected to a wheel (R1, R2) of the vehicle (100); at least one first planetary gear set (5) having a first sun shaft (5.1), a first ring gear shaft (5.2) and a first planet carrier shaft (5.3), exactly one of the shafts of the first planetary gear set (5) being rotationally fixedly connected to exactly one of the two output shafts (4.1); the oil collecting device (6) is rotationally and fixedly connected to the first planet carrier shaft (5.3); and an oil supply device (7) arranged on the stationary part and having at least one channel (9) for supplying lubricant to the oil collection device (6) via the non-rotating part. The invention also relates to a drive unit having an electric machine (3) and a differential transmission (1).

Description

Field of the Invention

[0001] The present invention relates to a differential transmission for a vehicle. Furthermore, the present invention relates to a drive unit comprising an electric machine and such a differential transmission. Background Art

[0002] DE 10 2011 108 170 A1 discloses a motor vehicle having an internal combustion engine, an electric machine and a housing enclosing at least one planetary transmission, wherein the planetary transmission couples the internal combustion engine and the electric machine to each other and comprises at least one sun gear, a planet carrier, a planet gear and a ring gear. The planetary transmission has its own circulating lubrication system, which comprises: a lubricant reservoir; a bore system, which is in a part of the housing, for delivering lubricant to at least one component of the planetary transmission; a supply of lubricant to a contact point between two parts of the planetary transmission that are movable relative to each other; and a rotary drive element for the lubricant, which is part of the planetary transmission and serves to accelerate the lubricant.

[0003] The lubricant serves for cooling and lubrication in the transmission. In a planetary transmission, the lubricant is typically guided via a rotatable shaft. Through distribution bores in the shaft, the lubricant is supplied, for example axially, in the region of an oil collecting device of the planet carrier for cooling and lubricating the planet gears and the planet bearings. There are disadvantages associated with this form of lubricant guidance. For example, supplying the lubricant into the shaft often requires additional sealing elements, such as rectangular rings, arranged on the shaft. In particular, this increases the cost of the transmission. Furthermore, supplying the lubricant into the shaft often results in an additional overall axial length, since the additional components require more installation space. In addition, the bores in the shaft weaken the latter, thus reducing the power density achievable by the transmission. Supplying the lubricant into the shaft causes a drag torque, thus increasing the energy consumption and reducing the range of the vehicle. Summary of the Invention

[0004] It is an object of the present invention to provide an alternative differential transmission for a vehicle, wherein the differential transmission is intended to be constructed in a compact and cost-effective manner. In particular, it is intended to optimize the supply of lubricant to the differential transmission and the lubricant guidance in the housing of the differential transmission. The object of the present invention is achieved by a differential transmission having the features of independent patent claim 1. Advantageous embodiments are the subject matter of the dependent claims, the following description and the drawings.

[0005] A differential transmission for a vehicle according to the present invention includes: a drive shaft configured to operatively drive a connection to an electric motor; a first output shaft and a second output shaft, each of the first output shaft and the second output shaft being configured to operatively drive a connection to a wheel of the vehicle; at least one first planetary gear set having a first sun shaft, a first ring gear shaft, and a first carrier shaft, wherein exactly one of the shafts of the first planetary gear set is rotationally fixedly connected to exactly one of the two output shafts; an oil collecting device rotationally fixedly connected to the first carrier shaft; and an oil supply device arranged on a stationary component and having at least one passage for supplying lubricant to the oil collecting device via a non-rotating component.

[0006] "Operatively drive a connection" should be understood to mean that additional components, in particular shafts, gears, and / or shift elements, can be arranged between the components operatively drivingly connected to each other. For example, the drive shaft is rotationally fixedly connected to the rotor of the electric motor, where the electric motor introduces drive power into the differential transmission. The drive power of the electric motor is distributed to the two wheels of the vehicle axle via the two output shafts. The corresponding output shaft can be directly or directly or indirectly or indirectly connected to the associated wheel via a universal joint, a cardan shaft, and / or a wheel hub.

[0007] Within the meaning of the present invention, "shaft" should be understood to mean a rotatable component of the transmission, and in each case, the associated components of the transmission are rotationally fixedly connected to each other via this rotatable component, or when one of the shift elements is actuated, such a connection can be produced via this rotatable component. In this case, the corresponding shaft can connect the components axially or radially or axially and radially to each other. Therefore, the corresponding shaft can also exist as an intermediate member. For example, the corresponding components are radially connected via this intermediate member. In this case, the term "shaft" does not exclude the possibility that the components to be connected can be provided as one piece. In particular, two or more shafts rotationally fixedly connected to each other can be provided as one piece.

[0008] For example, the first sun shaft is configured as the drive part of the first planetary gear set. Preferably, the first sun shaft is rotationally fixedly connected to the drive shaft. The first carrier shaft is configured to rotate, i.e., not fixedly in a stationary manner. Preferably, the first carrier shaft is rotationally fixedly connected to exactly one of the two output shafts. In particular, the first carrier shaft is rotationally fixedly connected to the first output shaft. Further preferably, the first ring gear shaft is configured to rotate, i.e., not fixedly in a stationary manner. Therefore, the first carrier shaft and the first ring gear shaft form the output of the first planetary gear set.

[0009] The "oil collecting device" should be understood to mean a device which is provided in one or more parts and which is provided for collecting the lubricant for the first planetary gear set. The collected lubricant is supplied to the first planet carrier shaft for lubricating and cooling the elements arranged thereon. Since the oil collecting device is rotationally fixedly connected to the first planet carrier shaft, the lubricant can be efficiently supplied to the first planet carrier shaft by centrifugal force, by means of which the supply of the lubricant to the planet gears and planet bearings of the first planetary gear set is achieved. The planet gears of the first planetary gear set are in tooth engagement with the sun shaft and the ring gear shaft.

[0010] In the context of the present invention, the "lubricant" should be understood to mean a device for lubricating and cooling the teeth and bearing elements which are in tooth engagement with each other. For example, oil or an oil mixture is suitable as the lubricant.

[0011] The oil supply device comprises at least one passage, i.e. a fluid line which is configured for guiding the lubricant. For example, additional passages which are preferably used for cooling the electric machine and / or for lubricating and cooling further teeth can branch off from the at least one passage. The oil supply device is arranged on a stationary part, i.e. a non-rotating part. The "stationary part" should be understood to mean a part which is fixedly secured in a stationary manner, in particular rotationally fixedly connected to a part of the housing or integrally connected to a part of the housing. As a result, the lubricant is guided directly to the oil collecting device via the non-rotating part, with the result that the passage of the lubricant does not require other conventional rotating shafts. In particular, the costs are thus reduced, since the passage of the lubricant through the shaft often requires additional sealing elements, such as rectangular rings. In addition, the differential transmission can be formed in a more compact manner, since the total length of the shaft for sealing and the components are dispensed with. In addition, the power density of the differential transmission is increased, since the shaft is not weakened by lubricant holes and the drag losses due to the lubricant in the shaft are dispensed with.

[0012] According to a preferred embodiment, the differential transmission further comprises a second planetary gear set which has a second sun shaft, a second ring gear shaft and a second planet carrier shaft, wherein exactly one of the shafts of the second planetary gear set is rotationally fixedly connected to exactly one of the two output shafts. Preferably, the other of the shafts of the second planetary gear set is rotationally fixedly connected to exactly one of the shafts of the first planetary gear set. Preferably, the other shaft of the second planetary gear set is rotationally fixedly connected to the stationary part. For example, the second sun shaft is rotationally fixedly connected to the first ring gear shaft. For example, the second ring gear shaft is rotationally fixedly connected to the second output shaft. For example, the second planet carrier shaft is rotationally fixedly connected to the stationary part and is thus prevented from rotating.

[0013] The second planetary gear set is arranged radially nested relative to the first planetary gear set, wherein the first planetary gear set is arranged radially inside and the second planetary gear set is arranged radially outside. The two planetary gear sets together form an integral differential.

[0014] In the context of the present invention, an "integral differential" is to be understood as meaning a differential having a first planetary gear set and a second planetary gear set, wherein the first planetary gear set is operatively drivingly connected to a drive shaft, connected to the second planetary gear set and connected to a first output shaft. The second planetary gear set is operatively drivingly connected to a second output shaft. At the same output speed of the output shafts, the integral differential does not include teeth that extend circumferentially or circumferentially without rolling movement in the block. Thus, the relative movement of the components of the integral differential that mesh with each other always occurs independently of the output speed of the output shafts. In the case of an integral differential, the sum of the two wheel torques is not combined or combined to form a common axle torque in the rotating components, but rather, depending on the design of the first and second planetary gear sets, the drive power is distributed in the integral differential and transferred into the output shafts operatively connected thereto. Thus, due to the correspondingly relatively small torques, the components of the integral differential can be designed thinner. In addition, component reduction and weight savings are achieved. With such an integral differential, the two functions of torque conversion and torque distribution, which are usually achieved by two separate components, can be represented by a single integral component. Thus, the integral differential is a combined transmission and differential transmission, which on the one hand achieves torque conversion and on the other hand torque distribution to the output shafts.

[0015] According to a preferred embodiment, the oil collecting device includes at least one at least partially circumferential ring element. For example, the oil collecting device is arranged circumferentially annularly in one piece on the first planet carrier shaft. Alternatively, the oil collecting device is arranged in a plurality of parts and arranged on the first planet carrier shaft such that lubricant can be supplied via the respective planet pins of the planet gears of the first planetary gear set. In particular, a plurality of circumferential pocket-shaped ring elements on the first planet carrier shaft form the oil collecting device.

[0016] According to a preferred embodiment, the oil supply device is at least partially integrated in the stationary component. In other words, the oil supply device is part of the stationary component, for example part of the housing or part of an element rotatably fixedly connected to the housing. Alternatively, the oil supply device is formed as a separate component arranged on the stationary component. For example, the oil supply device is formed of metal or plastic.

[0017] According to a preferred embodiment, the at least one channel is formed by at least one hole in the stationary part. Thus, the at least one channel is produced by machining. Alternatively, the at least one channel is produced by casting. Preferably, the at least one channel is formed at least partially in the stationary part substantially obliquely in the radial direction. In other words, the at least one channel extends obliquely or at an angle or skewed with respect to an axis formed in the radial direction with respect to the rotational axis of the first planetary gear set. In particular, the at least one channel is formed by boring a hole in the housing wall, wherein the hole is arranged obliquely in the housing wall such that the hole can be bored obliquely from the radial outside or the radial inside. Thus, the production of the lubricant supply device is facilitated while the lubricant distribution is improved. Preferably, the at least one channel is formed at least partially in the stationary part substantially in the axial direction. Thus, the at least one channel extends at least partially axially parallel to the rotational axis of the first planetary gear set. In particular, the at least one channel can be formed at a slight angle with respect to the rotational axis of the first planetary gear set.

[0018] According to a preferred embodiment, the lubricant supply device is fluidly connected to a pump which is designed to supply lubricant into the lubricant supply device. The lubricant is collected, for example, on the housing base of the differential transmission and is sucked from there by the pump and supplied to the lubricant supply device. In particular, a lubricant reservoir is formed on the housing base of the differential transmission. Further components, in particular a heat exchanger and / or a filter element, can be arranged in the supply line of the pump. Advantageously, the volume flow rate of the lubricant is set by a control unit, thus enabling reliable lubrication and cooling. In particular, an oil filter and a heat exchanger can be arranged effectively in the lubricant circuit. Furthermore, the oil level on the housing base of the differential transmission can be reduced in order to minimize the drag torque due to splashing.

[0019] Alternatively or additionally, the lubricant supply device is fluidly connected to a collecting channel which is designed to supply lubricant into the lubricant supply device. A rotating part of the differential transmission, such as the second ring gear shaft, is immersed in the lubricant which has been collected on the housing base of the differential transmission and carries the lubricant along a middle space with respect to the housing, wherein the lubricant is collected by the collecting channel and supplied from there to the lubricant supply device. Advantageously, in the case of a sufficient amount of lubricant on the housing base of the differential transmission, the pump can be dispensed with, thus saving costs and weight.

[0020] According to a preferred embodiment, the lubricant supply device includes an annular channel for receiving and distributing lubricant. The pump and / or the collecting channel transports the lubricant directly into the annular channel, which is provided as a lubricant space and which is preferably formed between the housing and the second planetary carrier shaft. The lubricant is advantageously distributed via the annular channel. In particular, the annular channel is formed circumferentially in the circumferential direction.

[0021] Preferably, the annular channel is fluidly connected to the at least one channel and at least one lubrication hole in the second planetary gear set. In particular, the at least one lubrication hole is formed in a planetary pin of a planetary gear of the second planetary gear set, wherein the planetary pin is arranged on a second planet carrier shaft. The second planet carrier shaft is rotationally fixed to a stationary component forming the annular channel. Lubricant is supplied from the annular channel to the at least one channel and the at least one lubrication hole.

[0022] In order to be able to mount the second planet carrier shaft in a simple manner and at the same time ensure a firm, rotationally fixed connection relative to the stationary component configured as a housing, the second planet carrier shaft is preferably rotationally fixed to the stationary component via a drive tooth. In particular, a drive tooth is provided, in particular for fixing the second planet carrier shaft against rotation. Thus, the torque of the differential transmission is supported on the stationary component via the second planet carrier shaft and the drive tooth. The drive tooth is preferably produced by casting, thus reducing production costs. In particular, the drive tooth includes teeth on the second planet carrier shaft and teeth on the stationary component, which engage with each other in a form-fitting manner. The drive tooth is preferably arranged on the front axial side of the second planet carrier shaft. Preferably, the drive tooth is arranged in the annular channel configured as a lubricant space. In this case, a lubricant film can be formed between the teeth of the respective contacting teeth, which has a positive effect on the differential transmission, in particular on the acoustic properties of the differential transmission.

[0023] According to a preferred embodiment, the oil supply device includes at least one constriction. A "constriction" is to be understood as meaning a locally conical shape, the flow cross-section of which is smaller than the flow cross-section of the channel. The constriction affects the oil flow restriction and / or the targeted oil discharge from the channel. In particular, the lubricant pressure is set by the constriction. For example, the constriction is formed as a separate component, preferably as a sheet metal element or a plastic element, and is arranged on the at least one channel. Alternatively, the constriction is formed as a hole, the flow cross-section of which is smaller than the flow cross-section of the channel, and is integrated in the at least one channel.

[0024] According to a preferred embodiment, at least the first planetary gear set includes helical teeth of the planetary gears, wherein the oil supply device is configured to guide lubricant into the helical teeth, wherein the helical teeth are configured to guide lubricant from one front side of the planetary gear set to the opposite front side of the planetary gear set. Thus, the lubricant transport effect of the helical teeth between the planetary gears and the sun shaft and the ring gear shaft is used to transport lubricant to additional bearings located on the other front side of the planetary gears. In other words, the helical direction of the teeth and the rotational direction of the planetary gears are coordinated with each other such that the lubricant is transported away from the supply point and axially transported to additional lubrication points and cooling points by tooth engagement on the planetary gear set.

[0025] According to a preferred embodiment, the oil supply device is configured to inject lubricant at least through a first planetary gear set from one side of the planetary gear set to the opposite side of the planetary gear set. In particular, during the rotation of the first planet carrier shaft, the lubricant is injected through an air space formed circumferentially between the respective planetary gears of the first planetary gear set, so that the conveyance of the lubricant from one side of the planetary gear set to the opposite side thereof occurs particularly effectively. Thus, a lubricant jet is generated on the at least one channel, for example, by a constriction, and the lubricant jet is guided substantially in the axial direction through the planetary gear set, preferably slightly inclined in the circumferential direction, so as to cool and lubricate the elements on the opposite side of the planetary gear set. If the lubricant jet leaves the at least one channel in a slightly inclined manner, a smaller interruption can be achieved by the rotating planetary gears.

[0026] The drive unit according to the invention includes an electric motor and a differential transmission according to the invention. The vehicle according to the invention includes at least one drive unit according to the invention. The definitions and statements regarding the technical effects, advantages, and advantageous embodiments of the differential transmission according to the invention apply equally to the drive unit according to the invention and the vehicle according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Advantageous embodiments of the invention explained below are shown in the drawings, in which the same or similar elements have the same reference numerals. In the drawings:

[0028] Figure 1 A highly abstract schematic view of a vehicle having a drive axle including a drive unit according to the invention is shown;

[0029] Figure 2 An abstract schematic view of a drive unit according to a first exemplary embodiment of the invention is shown;

[0030] Figure 3 A further highly abstract schematic view of a drive unit according to the first exemplary embodiment is shown;

[0031] Figure 4 A highly abstract schematic view of a drive unit according to a second exemplary embodiment of the invention is shown;

[0032] Figure 5 An abstract schematic view of a drive unit according to a third exemplary embodiment of the invention is shown; and

[0033] Figure 6 An abstract schematic view of a drive unit according to a fourth exemplary embodiment of the invention is shown. DETAILED DESCRIPTION

[0034] Figure 1Vehicle 100 is shown which includes a first axle 101 and a second axle 102. The first axle 101 includes two wheels R1, R2, and the second axle 102 includes two wheels R3, R4. In this case, the first axle 101 is configured as the rear drive axle of vehicle 100 and is equipped with a drive unit according to the present invention. The drive unit includes an electric motor 3 configured to generate drive power and a differential transmission 1 operatively drivingly connected to the electric motor 3. Thus, vehicle 100 is configured as an electric vehicle, i.e., an electrically drivable vehicle. The drive unit is arranged transversely with respect to the longitudinal direction of the vehicle and is operatively drivingly connected to the wheels R1, R2 of the first axle 101. In this case, on the second axle 102 of vehicle 100, i.e., on the front axle, no additional drive unit is arranged, thus saving cost, weight, and installation space. Alternatively, the drive unit can be arranged on the front axle of vehicle 100 instead of the rear axle. To implement an all-wheel drive system, an additional drive unit can be arranged on the second axle 102 and operatively drivingly connected to the wheels R3, R4 of said axle 102.

[0035] Figure 2 Details of the drive unit are shown, where, in this case, the focus is on the differential transmission 1. The differential transmission 1 includes a drive shaft 2 operatively drivingly connected to the electric motor 3, a first output shaft 4.1 and a second output shaft 4.2, a first planetary gear set 5 and a second planetary gear set 8, and an oil supply device 7 and an oil collecting device 6 interacting therewith, where the first output shaft 4.1 and the second output shaft 4.2 are each configured to be operatively drivingly connected to Figure 1 the wheels R1, R2 of the vehicle 100 shown.

[0036] The first planetary gear set 5 includes a first sun shaft 5.1, a first ring gear shaft 5.2, and a first planet carrier shaft 5.3, where a plurality of first planetary gears 5.4 are rotatably arranged on a first planetary pin 5.5, and where the first planetary gears 5.4 are in tooth engagement with the first sun shaft 5.1 and the first ring gear shaft 5.2. The second planetary gear set 8 includes a second sun shaft 8.1, a second ring gear shaft 8.2, and a second planet carrier shaft 8.3, where a plurality of second planetary gears 8.4 are rotatably arranged on a second planetary pin 8.5, and where the second planetary gears 8.4 are in tooth engagement with the second sun shaft 8.1 and the second ring gear shaft 8.2. The two planetary gear sets 5, 8 are arranged in a radially stacked manner, rotate about a common axis of rotation A, and form an integral differential. In this case, the electric motor 3 is formed coaxially with respect to the differential transmission 1, where the drive shaft 2 is formed as a hollow shaft, and the first output shaft 4.1 is axially guided through the differential transmission 1 and the electric motor 3.

[0037] The first sun shaft 5.1 is rotationally fixedly connected to the drive shaft 2, wherein the drive shaft 2 is rotationally fixedly connected to the rotor 14 of the electric motor 3. The rotor 14 rotates within the stator 16 of the electric motor 3 that is fixed relative to the housing. The first ring gear shaft 5.2 is rotationally fixedly connected to the second sun shaft 8.1. In this case, the first ring gear shaft 5.2 and the second sun shaft 8.1 form an intermediate gear with internal teeth and external teeth, wherein the intermediate gear is configured as a coupling shaft between the two planetary gear sets 5, 8 and connects the two planetary gear sets 5, 8 to each other. The first planet carrier shaft 5.3 is rotationally fixedly connected to the first output shaft 4.1. The second ring gear shaft 8.2 is rotationally fixedly connected to the second output shaft 4.2. The second planet carrier shaft 8.3 is rotationally fixedly connected to a stationary part configured as the housing G. Thereby, rotation of the second planet carrier shaft 8.3 is prevented. For this purpose, a drive tooth 15 is formed between the housing G and the second planet carrier shaft 8.3.

[0038] The lubricant supply device 7 is integrated in a stationary part configured as the housing G and includes a passage 9 for supplying lubricant to the oil collecting device 6 via a non-rotating part. In other words, the lubricant is guided through the passage 9 in the housing G to the oil collecting device 6 via a rotating part (such as a shaft) without detouring. The oil collecting device 6 is rotationally fixedly connected to the first planet carrier shaft 5.3 and thus rotates together with the first planet carrier shaft 5.3. In this case, the oil collecting device 6 is configured as a circumferential ring element and is configured to trap the lubricant and introduce the lubricant into the first planet pin 5.5. The lubricant is distributed via lubricant holes in the first planet pin 5.5 to the planetary bearings of the first planetary gear 5.4, to the axial thrust washers, and to the teeth in order to cool and lubricate them. In this case, most of the passage 9 is formed by a hole in the stationary part, wherein the hole is formed in the stationary part substantially obliquely in the radial direction. In particular, the hole has an inclination angle of 30° relative to an axis formed perpendicular to the rotational axis. In addition, a further part of the passage 9 is formed in the stationary part substantially in the axial direction (i.e., axially parallel to the rotational axis A), wherein the second part is produced by casting as a housing recess 19. Thus, costs are saved. The lubricant supply device 7 includes a constriction 13 formed by tapering of the through hole between the two parts of the passage 9. In addition, the lubricant supply device 7 includes an annular passage 12 for receiving and distributing the lubricant. The annular passage 12 is arranged at the level of the second planetary gear set 8 and is formed axially between the housing G and the second planet carrier shaft 8.3. The drive tooth 15 is arranged in the annular passage 12. The annular passage 12 is fluidly connected to the passage 9 and to lubricant holes on the planet pins 8.5 of the second planetary gear set 8.

[0039] The lubricant is, for example, supplied via a pump 10 which is Figure 3shown in a simplified manner) and a lubricant line 17 (which interacts with the pump 10) are removed from a lubricant reservoir 18 in the housing G and supplied to an annular channel 12, which annular channel 12 is Figure 3 shown in a highly simplified manner. Thus, the oil supply device 7 is fluidly connected to the pump 10, which pump 10 is designed to supply lubricant into the oil supply device 7.

[0040] In Figure 3 the lubricant flow is shown by arrows in a highly simplified manner. The annular channel 12 fluidly connects the second planet pins to each other and lubricates and cools the bearings of the second planet gears as well as the thrust washers and teeth. From this annular channel 12, the channel 9 of the oil supply device 7 extends radially and obliquely inwards in the direction of the rotational axis A. The tapering of the hole diameter serves as a constriction 13 for restricting the flow-through. The constriction 13 terminates in a housing recess 19 produced by casting, from which the lubricant flows axially in the direction of the first planet carrier shaft 5.3. After leaving the stationary part constructed as the housing G, the lubricant is collected by an oil collecting device 6 rotating with the first planet carrier shaft 5.3 and conveyed into a lubricant hole to reach the first planet pin 5.5. From there, the lubricant cools and lubricates the planet bearings, then the axial thrust washers, and finally the teeth.

[0041] Figure 4 A second embodiment of the drive device according to the invention is shown. The drive device according to Figure 4 corresponds generally to the drive device according to Figure 3 wherein the difference between these two embodiments lies in the arrangement of the collecting channel 11 rather than the pump. A collecting channel 11 is provided for supplying lubricant into the oil supply device 7 and is fluidly connected to the oil supply device 7. The lubricant flow is shown by arrows in a highly simplified manner in Figure 4 . The second ring gear shaft 8.2 rotates clockwise and dips into the lubricant reservoir 18 in the housing G and carries lubricant along the intermediate space relative to the housing G. The lubricant is trapped by the collecting channel 11 and supplied to the annular channel 12 of the oil supply device 7. Thus, the pump can be omitted, thereby saving costs and weight. In other respects, this exemplary embodiment corresponds to the exemplary embodiment according to Figure 3 .

[0042] Figure 5 A third embodiment of the drive device according to the invention is shown. The drive device according to Figure 5 corresponds generally to the drive device according to Figure 2a drive device, wherein the difference between these two embodiments lies in the design of the portion formed axially in the channel 9. In this case, the portion formed substantially axially in the channel 9 is formed not as a recess but as a hole. In addition, the restraint portion 13 is formed as a separate component at the end of the portion formed axially in the channel 9. In addition, additional inclined holes formed as restraint portions having a smaller diameter are configured to directly inject lubricant from the portion formed axially in the channel 9 to the teeth between the first sun shaft 5.1 and the first planetary gear 5.4. The planetary gear sets 5, 8 each include helical-tooth planetary gears 5.4, 8.4. The lubricant supply device 7 is configured to inject lubricant into the helical teeth between the first sun shaft 5.1 and the first planetary gear 5.4, wherein the helical teeth are configured to guide the lubricant from one front side of the planetary gear set 5 to the opposite front side of the planetary gear set 5. Accordingly, additional bearings can be supplied with lubricant from the lubricant supply device 7 on the other side of the first planetary gear set 5. In other respects, according to Figure 5 the exemplary embodiment corresponds to the reference according to Figure 2 the exemplary embodiment.

[0043] Figure 6 FIG. 8 shows a fourth embodiment of a drive device according to the present invention. According to Figure 6 the drive device substantially corresponds to the drive device according to Figure 2 wherein the difference between these two embodiments lies in the design of the channel 9. In this case, the channel 9 is formed by two holes in the housing wall, wherein the hole portion of the channel 9 adjacent to the annular channel 12 is inclinedly arranged in the housing wall such that it can be inclinedly bored from the radially outer side, and the hole portion of the channel 9 adjacent to the first planetary gear set 5 is inclinedly arranged in the housing wall such that it can be inclinedly bored from the radially inner side. Accordingly, the production of the lubricant supply device is facilitated while the lubricant distribution is improved. The restraint portion 13 configured as a separate element is arranged at the outlet opening adjacent to the first sun shaft 5.1. The lubricant supply device 7 is configured to inject lubricant from one side of the planetary gear set 5 through the first planetary gear set 5 to the opposite side of the planetary gear set 5 via the restraint portion 13. In other words, the first planetary gear 5.4 moves past in front of the lubricant jet flowing through the restraint portion 13. Whenever there is no first planetary gear 5.4 obstructing the flow of the lubricant jet, the lubricant can pass between the first planetary gears 5.4 to reach the opposite side of the first planetary gear set 5. Accordingly, additional bearings arranged on the other side of the first planetary gear set 5 can be supplied with lubricant from the lubricant supply device 7. In addition, additional lubricant flows through additional substantially axially formed holes and branches to the oil collecting device 6. In other respects, according to Figure 6 the exemplary embodiment corresponds to the reference according to Figure 2 the exemplary embodiment.

[0044] Reference Signs

[0045] 1 Differential Transmission

[0046] 2 Drive Shaft

[0047] 3 Electric Machine

[0048] 4.1 First Output Shaft

[0049] 4.2 Second Output Shaft

[0050] 5 First Planetary Gear Set

[0051] 5.1 First Sun Shaft

[0052] 5.2 First Ring Gear Shaft

[0053] 5.3 First Planet Carrier Shaft

[0054] 5.4 First Planetary Gear

[0055] 5.5 First Planetary Pin

[0056] 6 Oil Collecting Device

[0057] 7 Oil Supply Device

[0058] 8 Second Planetary Gear Set

[0059] 8.1 Second Sun Shaft

[0060] 8.2 Second Ring Gear Shaft

[0061] 8.3 Second Planet Carrier Shaft

[0062] 8.4 Second Planetary Gear

[0063] 8.5 Second Planetary Pin

[0064] 9 Passage

[0065] 10 Pump

[0066] 11 Collection Passage

[0067] 12 Annular Passage

[0068] 13 Restraining Portion

[0069] 14 Rotor

[0070] 15 Driving Tooth

[0071] 16 Stator

[0072] 17 Lubricant Pipeline

[0073] 18 Lubricant Reservoir

[0074] 19 Housing Recess

[0075] G housing

[0076] A axis of rotation

[0077] 100 vehicle

[0078] 101 first axle

[0079] 102 second axle

[0080] R1 wheel

[0081] R2 wheel

[0082] R3 wheel

[0083] R4 wheel.

Claims

1. A differential transmission (1) for a vehicle (100), comprising a drive shaft (2) configured to be operatively drivingly connected to an electric motor (3), a first output shaft (4.1) and a second output shaft (4.2), each of the first output shaft and the second output shaft being configured to be operatively drivingly connected to wheels (R1, R2) of the vehicle (100), At least one first planetary gear set (5), said at least one first planetary gear set having a first sun shaft (5.1), a first ring gear shaft (5.2) and a first carrier shaft (5.3), wherein, exactly one of the shafts of the first planetary gear set (5) being rotationally fixedly connected to exactly one of the two output shafts (4.1), an oil collecting device (6) rotationally fixedly connected to the first planet carrier shaft (5.3); and an oil supply device (7) arranged on a stationary component and having at least one passage (9) for supplying lubricant to the oil collecting device (6) via a non-rotating component.

2. The differential transmission (1) according to claim 1 further comprises a second planetary gear set (8), said second planetary gear set having a second sun shaft (8.1), a second ring gear shaft (8.2) and a second carrier shaft (8.3), wherein, Exactly one of the shafts of the second planetary gear set (8) is rotationally fixedly connected to exactly one of the two output shafts (4.2).

3. The differential transmission (1) according to one of the preceding claims, wherein, The oil collecting device (6) includes at least one at least partially circumferential ring element.

4. A differential transmission (1) according to one of the preceding claims, wherein, The oil supply device (7) is at least partially integrated in the stationary component.

5. The differential transmission (1) according to one of the preceding claims, wherein, The at least one passage (9) is formed by at least one hole in the stationary component.

6. The differential transmission (1) according to one of the preceding claims, wherein, The at least one passage (9) is at least partially formed in the stationary component substantially obliquely in a radial direction.

7. A differential transmission (1) according to one of the preceding claims, wherein, The at least one passage (9) is at least partially formed in the stationary component substantially in an axial direction.

8. A differential transmission (1) according to one of the preceding claims, wherein, The oil supply device (7) is fluidly connected to a pump (10) designed to supply lubricant into the oil supply device (7).

9. The differential transmission (1) according to one of the preceding claims, wherein, The oil supply device (7) is fluidly connected to a collecting passage (11) designed to supply lubricant into the oil supply device (7).

10. A differential transmission (1) according to one of the preceding claims, wherein, The oil supply device (7) includes an annular passage (12) for receiving and distributing lubricant.

11. The differential transmission (1) according to claim 10 in combination with claim 2, wherein, The annular passage (12) is fluidly connected to the at least one passage (9) and at least one lubrication hole at the second planetary gear set (8).

12. A differential transmission (1) according to one of the preceding claims, wherein, The oil supply device (7) includes at least one constriction (13).

13. A differential transmission (1) according to one of the preceding claims, wherein, At least the first planetary gear set (5) includes helical-toothed planet gears (5.4), wherein the oil supply device (7) is configured to direct the lubricant into the helical teeth, wherein the helical teeth are configured to direct the lubricant from one front side of the planetary gear set (5) to the opposite front side of the planetary gear set (5).

14. A differential transmission (1) according to one of the preceding claims, wherein, The oil supply device (7) is configured to spray the lubricant at least through the first planetary gear set (5) from one side of the planetary gear set (5) onto the opposite side of the planetary gear set (5).

15. A drive unit, comprising an electric motor (3) and a differential transmission (1) according to one of the preceding claims.

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