Differential transmission for vehicle

Abstract

A differential transmission (3) for a vehicle includes a first output shaft (5), a second output shaft (6), a first planetary gear set (10), a second planetary gear set (20), a sun ring gear (32), and a stationary member (31). The first planetary gear set includes a first sun gear (11), a first planet carrier (12), first planet gears (13), and a first ring gear (14). The second planetary gear set includes a second sun gear (21), a second carrier (22), second planetary gears (23), and a second ring gear (24). The first planet carrier is connected to the first output shaft (5) by means of an anti-torque connection. The second ring gear is rotationally fixed to the second output shaft (6). The sun ring gear forms a first ring gear at an inner periphery and forms a second sun gear (21) at an outer periphery. The second planet carrier is supported at a stationary part (31). The first planet carrier is rotatably supported at the stationary part (31) by means of a support (40). The support of the first planet carrier is arranged opposite the anti-torque connection in the axial direction with respect to the first planet gear.

Description

Technical Field

[0001] The invention relates to a differential transmission for a vehicle. Furthermore, the invention relates to a drive unit with a differential transmission and to a vehicle with a drive unit. Background Art

[0002] Differential transmissions are commonly used in vehicles. Differential transmissions are used to enable drive wheels driven by the same motor to have different rotational speeds. This is required, for example, when turning a curve. The drive wheel on the inside of the curve covers a shorter path than the drive wheel on the outside of the curve. In this respect, the drive wheel on the inside of the curve must rotate slower than the drive wheel on the outside of the curve. Summary of the invention

[0003] The invention is based on the object of providing an improved differential transmission which has an extended service life, can be produced more cost-effectively and has a lower arrangement with regard to installation space.

[0004] This object is achieved by a differential transmission having the features of claim 1 .

[0005] A differential transmission for a vehicle comprises a first output shaft, a second output shaft, a first planetary gear set, a second planetary gear set, a sun ring gear and a stationary component. The first output shaft and the second output shaft can extend out of the stationary component in an axial direction. In this case, the axial direction can be determined by the axis of rotation of the first output shaft. The first output shaft and the second output shaft can be coaxial with each other. The vehicle can be, for example, a commercial vehicle such as a truck, a construction machine or an agricultural machine or a bus.

[0006] The first planetary gear set includes a first sun gear, a first planet carrier, a first planet gear and a first ring gear. The first planetary gear set may include a plurality of planet gears, preferably three planet gears. The first planetary gear set may be formed as a positive planetary gear set or a negative planetary gear set. The first sun gear is engaged with the first planet gear, and the first planet gear is engaged with the first ring gear. The engagement between the two gears is achieved by means of an overlap of the gears in the axial direction and a spacing of the rotation axes of the gears in the radial direction, so that at least one tooth of one gear contacts a tooth of the second gear. The first sun gear, the first planet carrier and the first ring gear may be arranged coaxially with each other. The first sun gear may be used to drive the first planetary gear set.

[0007] The first planet carrier can be used as an output and connected to the first output shaft by means of a torsion-proof connection. The torsion-proof connection can be arranged adjacent to the second output shaft in the region of one end of the first output shaft located inside the stationary component support. The first output shaft can be arranged coaxially with the first sun gear.

[0008] If two elements are connected to each other, they are coupled to each other directly or indirectly so that a movement of one element causes a reaction of the other element. For example, the connection can be provided by a form-fitting or friction-fitting connection. The connection can correspond to the meshing of corresponding toothings of the two elements. Between the elements, further elements, such as one or more spur gear stages, can be provided. For example, the connection can be torsion-proof.

[0009] The torsion-proof connection of two elements is understood to mean a connection in which the two elements are rigidly coupled to each other in all expected states of the transmission so that they have approximately the same rotational speed. These elements can exist here as separate components connected to each other in a torsion-proof manner or as a single piece. The torsion-proof connection can be designed as a keyed shaft connection or a toothed shaft connection. In this case, a fixing element such as a fixing ring, a circlip or a spiral ring can be provided to limit the relative movement in the axial direction. The torsion-proof connection can be designed as a press connection or as a screw connection by means of a flange of the first planet carrier and the first output shaft.

[0010] The first planet carrier is rotatably supported at the stationary part by means of a support. The support of the first planet carrier is arranged opposite to the torsion-proof connection in the axial direction relative to the first planet gear. The axial direction can be the axial direction of the planet axis of the first planet carrier, on which the first planet gear is rotatably mounted. The support of the first planet carrier can be designed as a needle sleeve without an inner ring. The bushing can be present on the inner side of the needle sleeve. If the first planet carrier is produced at least partially from hardened steel, the bushing can be omitted.

[0011] As a result, the first planet carrier can be designed to be thinner and the service life of the differential transmission can be extended. In this case, it is not necessary to guide oil between the first output shaft and the second output shaft. As a result, the second output shaft is not weakened and can be designed to be thin-walled, which leads to a lower weight. In addition, corresponding sealing elements can be omitted, which leads to cost advantages, installation space advantages and weight advantages. There is no need to directly supply oil to the support of the second output shaft via the stationary parts, because fewer support parts require oil in total.

[0012] The second planetary gear set includes a second sun gear, a second planet carrier, a second planet gear and a second ring gear. The second planetary gear set may include a plurality of planet gears, preferably three planet gears. The second planetary gear set may be formed as a positive planetary gear set or a negative planetary gear set. The second sun gear engages with the second planet gear, and the second planet gear engages with the second ring gear. The second sun gear, the second planet carrier and the second ring gear may be arranged coaxially with each other and coaxially with the first sun gear, the first planet carrier and the first ring gear. The second ring gear is connected to the second output shaft. The connection between the second ring gear and the second output shaft may be designed as a press connection, or by means of a screw connection with the second ring gear in the axial direction of the second planet carrier, or by means of a shaft-hub connection. The connection between the second ring gear and the second output shaft may be torsion-proof.

[0013] The sun ring gear forms a first ring gear at the inner periphery and a second sun gear at the outer periphery. The sun ring gear can be designed as a single piece. In an alternative embodiment, the sun ring gear can be designed in several parts. In this case, the sun ring gear comprises a first ring gear, a second sun gear and a coupling element. The first ring gear can then be connected torsionally at the inner periphery of the coupling element. The second sun gear can then be connected torsionally at the outer periphery of the coupling element.

[0014] The second planet carrier is supported at the stationary component. The support of the second planet carrier at the stationary component can be designed by means of a press connection, material bonding or screw connection of the second planet carrier to the stationary component in the axial direction. Alternatively, the second planet carrier can be fixed to the stationary component via a shift element. The torsion-proof connection between the two elements can be selectively established or released via a switching element (e.g., a clutch). The second planet carrier may include a second planet axis, and the second planetary gear is rotatably supported on the second planet axis. The second planet axis may be supported at the stationary component. A cylindrical protrusion of the stationary component may form the second planet axis.

[0015] The stationary component may be a transmission housing. The transmission housing may completely surround the first planetary gear set and the second planetary gear set. The transmission housing may include a recess to enable a mechanical connection from the outside of the transmission housing to the first sun gear. In addition, the transmission housing may include a recess to enable the first output shaft and the second output shaft to extend to the outside of the transmission housing.

[0016] In one embodiment, the support of the first planet carrier can be supported at the cylindrical outer periphery of a part of the stationary component. For example, the cylindrical outer periphery can be arranged at a cylindrical protrusion, which protrudes from the stationary component in the axial direction. An intermediate element can also be provided, which provides a cylindrical outer periphery and is supported at the stationary component. The outer periphery of the support of the first planet carrier is arranged at the cylindrical inner periphery of a part of the first planet carrier. An intermediate element can also be provided, which provides a cylindrical inner periphery and is supported at the first planet carrier.

[0017] In one embodiment, the support of the first planet carrier can be supported at the cylindrical inner periphery of a part of the stationary component. For example, the cylindrical inner periphery can be arranged in a hole or recess in the axial direction in the stationary component. An intermediate component can also be provided, which provides a cylindrical inner periphery and is supported at the stationary component. The inner periphery of the support of the first planet carrier is arranged at the cylindrical outer periphery of a part of the first planet carrier. An intermediate component can also be provided, which provides a cylindrical outer periphery and is supported at the first planet carrier.

[0018] In one embodiment, the differential transmission may include an input element. The input element may be connected to the first sun gear in a rotationally fixed manner. The connection may be designed as a shaft-hub connection, a press connection or a screw connection by means of a flange of the sun gear and the input element.

[0019] The input element is rotatably supported at the stationary component by means of a support. The first sun gear, the input element and the first output shaft can be arranged coaxially. As a result, a compact design of the differential transmission can be achieved.

[0020] In one embodiment, the support member of the first planet carrier may be arranged radially outwardly of the support member of the input element.The supports may be coaxial with each other.

[0021] In one embodiment, the support of the first planet carrier can overlap with the support of the input element in the axial direction. In particular, this embodiment can be used in combination with arranging a support of a portion of the first planet carrier in the radial direction on the outside of the support of the input element. Furthermore, this embodiment can be used in particular in combination with the backing of the support of the first planet carrier at the cylindrical periphery of a portion of the stationary component. For example, the support of the input element can be arranged completely on the inside of the support of the first planet carrier in the axial direction. In this case, a very compact design of the differential transmission in the axial direction is possible.

[0022] In one embodiment, the support of the first planet carrier can be arranged adjacent to the support of the input element in the axial direction. In particular, this embodiment can be used in combination with a backing of the support of the first planet carrier at the cylindrical inner circumference of a part of the stationary component. This enables a simpler oil supply to the support of the first planet carrier. In this embodiment, the diameter of the cylindrical inner circumference of a part of the stationary component can be selected to be small. Advantageously, a small bearing diameter leads to low friction losses. In this respect, the efficiency of the differential transmission can be increased.

[0023] Furthermore, a bushing made of hardened steel can be arranged at the cylindrical periphery of a part of the first planet carrier. The first planet carrier can then be produced, for example, from aluminum. Alternatively, a part of the first planet carrier can be used as a running surface for a support of the first planet carrier. The planet carrier can, for example, be produced at least partially from hardened steel. A separate bushing can then be omitted, which serves as a running surface for rolling bodies of the support of the first planet carrier and which is made of hardened steel at the cylindrical periphery of a part of the first planet carrier. This reduces the number of components of the differential transmission and enables a simple construction.

[0024] The cylindrical recess in the stationary part for the bearing seat on which the outer ring of the support of the input element is mounted can be used to form the bearing seat on which the outer ring of the support of the first planet carrier is mounted. In other words, the two bearing seats in the stationary part can be produced by one machining step. This reduces production costs.

[0025] In one embodiment, the first sun gear may be hollow. For example, the first sun gear may be annular. In this case, the first output shaft may extend through the first sun gear and be coaxial with the first sun gear. As a result, a compact design of the differential transmission is possible.

[0026] In one embodiment, the input element can be designed as a hollow shaft, wherein the first output shaft can extend through the input element. As a result, a compact design of the differential transmission can be achieved.

[0027] In one embodiment, the input element and the first sun gear may be formed as an integral piece. In other words, the input element may form the first sun gear. As a result, the number of components of the differential transmission may be reduced and a compact design of the differential transmission may be achieved.

[0028] In one embodiment, the sun ring gear may be annular. The first ring gear may be arranged radially inside the second sun gear, and the first ring gear may overlap with the second sun gear in the axial direction. The first ring gear and the second sun gear may overlap so that the gear having a smaller extension in the axial direction is arranged inside the other gear. For example, the second sun gear may be wider than the first ring gear in the axial direction. Then, the first ring gear may be arranged inside the second sun gear in the axial direction so that the first ring gear does not protrude from the second sun gear in the axial direction.

[0029] In one embodiment, the second output shaft can be arranged coaxially with the first output shaft and arranged opposite to the first output shaft in the axial direction relative to the stationary component. The first output shaft and the second output shaft can each extend as far as a drive wheel, a wheel hub or a cardan shaft of the vehicle. As a result, a compact design of the differential transmission is possible and the number of components of the differential transmission can be reduced.

[0030] In one embodiment, the torque introduced into the first sun gear may be transmittable to the first output shaft and the second output shaft.

[0031] In another embodiment, the first output shaft and the second output shaft may each be rotatably supported at the stationary component by means of a support. The supports of the first output shaft and the second output shaft may be arranged coaxially with each other.

[0032] The second output shaft may include a first support and a second support. The first support may be a floating bearing. The second support may be a fixed bearing. The first support of the second output shaft may be arranged outside the support of the first planet carrier in a radial direction. The first support of the second output shaft may overlap with the support of the first planet carrier in a radial direction. The first support of the second output shaft and the support of the first planet carrier may be designed in the same manner. The second support of the second output shaft may be arranged inside the support of the first planet carrier in a radial direction.

[0033] In one aspect, the drive unit comprises a motor and a differential transmission according to the previously described embodiments.The motor is coupled to the differential transmission so as to drive the first sun gear.

[0034] In one aspect, a vehicle comprises: a drive unit according to the aforementioned embodiment; and a drive wheel. The drive unit is installed in the vehicle so as to drive the drive wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A top view of a vehicle according to an embodiment is shown.

[0036] Figure 2A cross-sectional view of a differential transmission for a vehicle according to an embodiment is shown.

[0037] Figure 3 A cross-sectional view of a differential transmission for a vehicle is shown according to an alternative embodiment. DETAILED DESCRIPTION

[0038] Figure 1 A top view of a vehicle 1 according to an embodiment is shown. The vehicle 1 comprises a drive unit 2 having a motor 73, a differential transmission 3, a drive wheel 70, a first bridge 71 and a second bridge 72, the differential transmission 3 having a first output shaft 5 and a second output shaft 6. In the present embodiment, the motor 73 is an electric motor. In an alternative embodiment, the drive unit 2 is an internal combustion engine. The motor 73 is connected to the differential transmission 3 in such a way that the motor 73 can drive the first output shaft 5 and the second output shaft 6 by means of the differential transmission 3 and distribute the driving power of the motor 73.

[0039] The first output shaft 5 and the second output shaft 6 extend from the differential transmission 3 in two opposite directions parallel to the direction of the first bridge 71 towards the drive wheels 70. The first output shaft 5 extends through the transmission 3 and the motor 73. In this case, the first bridge 71 is a driven rear bridge of the vehicle 1. In an alternative embodiment, the first bridge 71 can be a driven front bridge of the vehicle 1. The first output shaft 5 and the second output shaft 6 are connected to the drive wheels 70 of the vehicle 1 in such a way that each of the first output shaft 5 and the second output shaft 6 can drive one of the drive wheels 70.

[0040] One of the drive wheels 70 transmits the driving power of the motor 73 to the ground, the drive wheel 70 rests on the ground and generates the driving movement of the vehicle 1. The steerable wheels 74 of the vehicle 1 are rotatably arranged on the second bridge 72 (the front bridge in this case). In an alternative embodiment, the second bridge 72 can be the rear bridge of the vehicle 1.

[0041] In another embodiment, a joint and a hub may be arranged between the respective drive wheel 70 and the first and second output shafts 5, 6 in order to compensate for possible misalignments of the first and second output shafts 5, 6, respectively.

[0042] Figure 2 A cross-sectional view of a differential transmission 3 for a vehicle 1 according to an embodiment is shown. Figure 2: is a half-section showing the upper part of the differential transmission 3. The differential transmission 3 includes a stationary component 31, an input shaft 4, a first output shaft 5 and a second output shaft 6. The first output shaft 5 and the second output shaft 6 extend out of the stationary component 31 in opposite directions. The differential transmission 3 also includes a first planetary gear set 10, which has: a first sun gear 11; a first planet carrier 12; a plurality of first planet gears 13; and a first ring gear 14. The first planet gears 13 are each rotatably mounted by means of a first planet axis. The first planet carrier 12 is mounted in the stationary component 31 by means of a support 40. The first sun gear 11 is engaged with the first planet gear 13. The first planet gear 13 is engaged with the first ring gear 14. The differential transmission 3 also includes a second planetary gear set 20, which has a second sun gear 21, a second planet carrier 22, a plurality of second planet gears 23 and a second ring gear 24. The second planet gears 23 are each rotatably mounted by means of a second planet axis. The second sun gear 21 is engaged with the second planet gear 23. The second planetary gears 23 are engaged with the second ring gear 24. The first sun gear 11, the first planetary gears 13, the first ring gear 14, the second sun gear 21, the second planetary gears 23, and the second ring gear 24 overlap in the axial direction.

[0043] The support member 40 of the first planet carrier 12 is described in more detail below.

[0044] The support member 40 of the first planet carrier 12 is arranged opposite to the torsion-proof connection 30 of the first planet carrier 12 and the first output shaft 5 in the axial direction with respect to the first planet gears 13 of the first planetary gear set 10. Therefore, the first planet carrier 12 is supported on both sides in the axial direction with respect to the first planet gears 13. Therefore, the radial force from one of the first planet gears 13 can be distributed to the support member 40 and the torsion-proof connection 30 of the first planet carrier 12. This results in a more uniform force distribution in the first planet carrier 12.

[0045] The support 40 of the first planet carrier 12 is designed here as a needle sleeve without an inner ring. The support 40 of the first planet carrier 12 also includes a bushing 44, here a hardened steel sleeve. The bushing 44 is arranged radially inside the needle sleeve. Therefore, the needle of the needle sleeve can roll on the bushing 44. In this case, the bushing 44 is positioned so that it protrudes beyond the needle sleeve in the axial direction. The width of the bushing 44 in the axial direction is greater than the width of the needle sleeve.

[0046] The differential transmission 3 further comprises an input element 4 , which is rotatably supported on the stationary component 31 by means of a support 43 .

[0047] The support member 40 of the first planet carrier 12 overlaps the support member 43 of the input element 4 in the axial direction. In this case, the support member 40 of the first planet carrier 12 is arranged outside the support member 43 of the input element 4 in the radial direction. In other words, Figure 2 In the cross-sectional view in , the support member 40 of the first planet carrier 12 is arranged above the support member 43 of the input element 4. Therefore, a compact installation space of the differential transmission 3 in the axial direction can be achieved.

[0048] Further details of the embodiments are described below.

[0049] The input element 4 is formed as a hollow shaft. The input element 4 can rotate about its center axis. The input element 4 is connected to the rotor shaft of the motor 73 in a rotationally fixed manner and is driven together with the rotor shaft of the motor 73. Figure 2 The rotor shaft of the motor is not shown. The first sun gear 11 is hollow and is formed as an integral piece with the input element 4. The first output shaft 5 extends through the first sun gear 11 and the input element 4 and is coaxial with the first sun gear 11.

[0050] The differential transmission 6 includes a sun ring gear 32. The sun ring gear 32 is hollow and annular. The sun ring gear 32 forms the first ring gear 14 at the inner periphery and forms the second sun gear 21 at the outer periphery. The sun ring gear 32 is arranged radially outside the first planetary gears 13. The sun ring gear 32 is engaged with the first planetary gears 13 and the second planetary gears 23 at the same time.

[0051] The second planet carrier 22 is supported in a torsionally fixed manner at the stationary component 31, wherein the second planet carrier 22 is fastened in the axial direction to the stationary component 31. The second ring gear 24 is connected to the second output shaft 6 in a torsionally fixed manner. The first output shaft 5 and the second output shaft 6 are coaxial with each other and are rotatably supported in the stationary component 31.

[0052] In another embodiment including all the features of the previous embodiments, the stationary component 31 is a two-part transmission housing. Figure 2 3 shows a cross section of the first part of the two-part transmission housing on the left side of the differential transmission 3. Figure 2 3 shows a section through the second part of the two-part transmission housing on the right side of the differential transmission 3. The two parts of the two-part transmission housing are circumferentially connected to one another by means of a screw connection. Figure 2 These screw connections are not shown in FIG.

[0053] The support 40 of the first planet carrier 12 forms a floating bearing. In the present case, the support 43 of the input element 4 is a grooved ball bearing and forms a fixed bearing.

[0054] The first output shaft 5 is rotatably supported in the stationary part 31 by means of a support, not shown. The support of the first output shaft 5, here a grooved ball bearing, is designed as a fixed bearing.

[0055] The second output shaft 6 is rotatably supported at the stationary part 31 by means of a first support 41 and a second support 42. The first support 41 of the second output shaft 6 (here a needle bearing) is a floating bearing. The second support 42 of the second output shaft 6 (here a grooved ball bearing) is a fixed bearing. In an alternative embodiment, the first support 41 is designed as a fixed bearing and the second support 42 is designed as a floating bearing.

[0056] In another embodiment including all the features of the aforementioned embodiment, the width of the first sun gear 11 in the axial direction is greater than the width of the first planetary gears 13. Further, the width of the sun ring gear 32 in the axial direction is respectively greater than the width of the first planetary gears 13 and the width of the second planetary gears 23. In addition, in order to position the sun ring gear 32 in the axial direction relative to the first planetary gears 13, fixing elements 56, 57 (here, snap rings) and thrust washers are provided at the inner periphery of the sun ring gear 32 on both sides of the first planetary gears 13.

[0057] The outer ring of the needle sleeve of the support 40 of the first planet carrier 12 is positioned in the axial direction by means of the shoulder of the first planet carrier 12 and the fixing element 50 (here a snap ring). The bushing 44 is positioned in the axial direction by means of the shoulder of the stationary part 31 and the fixing element 51 (here a fixing ring).

[0058] The outer ring of the first support 41 of the second output shaft is positioned in the axial direction by means of a shoulder in the stationary part 31 and by means of a fixing element 53 (here a snap ring). The outer ring of the second support 42 is positioned in the axial direction by means of a shoulder in the stationary part 31 and by means of a fixing element 58 (here a snap ring). The inner ring of the second support 42 is positioned in the axial direction by means of a shoulder in the second output shaft 6 and by means of a fixing element 54 (here a snap ring).

[0059] The width of the second ring gear 24 is greater than the width of the second planetary gears 23. For the rotationally fixed connection of the second ring gear 24 to the second output shaft 6, the second ring gear 24 and the second output shaft 6 each comprise a toothed portion of the shaft-hub connection. In addition, the rotationally fixed connection comprises a fixing element 55, here a snap ring, for relative positioning in the axial direction.

[0060] The torsionally fixed connection 30 of the first planet carrier 12 and the first output shaft 5 comprises a fixing element 52 (here a snap ring) for axial relative positioning. In the present embodiment, the input element 4 is formed as a single piece with the rotor shaft, and the input element 4 is rotatably supported in the stationary component 31 via a rotor support. In an alternative embodiment, the input element 4 comprises a toothed portion for a shaft-hub connection for the torsionally fixed connection of the input element 4 to the rotor shaft.

[0061] Figure 3 A cross-sectional view of a differential transmission 3 for a vehicle 1 according to an alternative embodiment of the invention is shown. This embodiment differs from the previous embodiment in that the support 40 of the first planet carrier 12 is designed differently from the previous embodiment. All other features are the same as the previously described embodiment.

[0062] The support 40 of the first planet carrier 12 is arranged adjacent to the support 43 of the input element 4 in the axial direction. The support 40 of the first planet carrier 12 is arranged on the inside of the support 43 of the input element in the radial direction. The bushing 44 of the support 40 of the first planet carrier 12 can be omitted here, because the first planet carrier 12 is produced at least in the area from hardened steel. In an alternative embodiment, the first planet carrier 12 is produced from aluminum. The bushing 44 is then arranged at the outer periphery of a part of the first planet carrier 12.

[0063] In another embodiment, the outer ring of the support element 40 of the first planet carrier 12 is positioned in the axial direction by means of a shoulder of the stationary component 31 and a fixing ring 50 (here a snap ring).

[0064] Reference numerals

[0065] 1 Vehicle

[0066] 2 Drivers

[0067] 3 Differential transmission

[0068] 4 Input components

[0069] 5 First output shaft

[0070] 6 Second output shaft

[0071] 10 First planetary gear set

[0072] 11 First sun gear of the first planetary gear set

[0073] 12 First planet carrier of the first planetary gear set

[0074] 13 First planetary gear of the first planetary gear set

[0075] 14 First ring gear of the first planetary gear set

[0076] 20 Second planetary gear set

[0077] 21 Second sun gear of the second planetary gear set

[0078] 22 Second planet carrier of the second planetary gear set

[0079] 23 Second planetary gear of the second planetary gear set

[0080] 24 Second ring gear of the second planetary gear set

[0081] 30 Torsion-resistant connection

[0082] 31 Stationary parts

[0083] 32 Sun gear

[0084] 40 Supporting element of first planet carrier

[0085] 41 First support member of the second output shaft

[0086] 42 Second support member of the second output shaft

[0087] 43 Input element support

[0088] 44 Bushing

[0089] 50, 51, 52, 53, 54, 55, 56, 57, 58 fixing elements

[0090] 70 driving wheel

[0091] 71 First Bridge

[0092] 72 Second Bridge

[0093] 73 Motor

[0094] 74 steerable wheels

Claims

1. A differential transmission (3) for a vehicle, comprising a first output shaft (5), a second output shaft (6), a first planetary gear set (10), a second planetary gear set (20), a sun ring gear (32) and a stationary member (31), wherein The first planetary gear set (10) comprises a first sun gear (11), a first planet carrier (12), a first planet gear (13) and a first ring gear (14), wherein the first sun gear (11) is engaged with the first planet gear (13) and the first planet gear (13) is engaged with the first ring gear (14), The second planetary gear set (20) comprises a second sun gear (21), a second planet carrier (22), a second planet gear (23) and a second ring gear (24), wherein the second sun gear (21) is engaged with the second planet gear (23) and the second planet gear (23) is engaged with the second ring gear (24), The first planet carrier (12) is connected to the first output shaft (5) by means of a torsion-resistant connection (30); The second ring gear (24) is connected to the second output shaft (6); The sun ring gear (32) forms the first ring gear (14) at the inner periphery and forms the second sun gear (21) at the outer periphery, The second planet carrier (22) is supported on the stationary component (31), The first planet carrier (12) is rotatably supported on the stationary component (31) by means of a support (40), and The support element (40) of the first planet carrier (12) is arranged opposite the rotationally fixed connection (30) in the axial direction relative to the first planetary gear (13).

2. The differential transmission (3) according to claim 1, characterized in that The support member (40) of the first planet carrier (12) is supported at the cylindrical periphery of a portion of the stationary component (31).

3. The differential transmission (3) according to claim 1, characterized in that The support member (40) of the first planet carrier (12) is supported at the cylindrical inner periphery of a portion of the stationary component (31).

4. The differential transmission (3) according to one of the preceding claims, characterized in that An input element (4) which is connected to the first sun gear (11) in a rotationally fixed manner and is rotatably supported on the stationary component (31) by means of a support (43).

5. The differential transmission (3) according to claim 4, characterized in that The support element (40) of the first planet carrier (12) is arranged outside the support element (43) of the input element (4) in the radial direction.

6. The differential transmission (3) according to claim 4 or 5, characterized in that The support member (40) of the first planet carrier (12) overlaps with the support member (43) of the input element (4) in the axial direction.

7. The differential transmission (3) according to claim 4 or 5, characterized in that The support element (40) of the first planet carrier (12) is arranged adjacent to the support element (43) of the input element (4) in the axial direction.

8. The differential transmission (3) according to one of the preceding claims, characterized in that The first sun gear (11) is hollow, wherein the first output shaft (5) extends through the first sun gear (11) and is coaxial with the first sun gear (11).

9. The differential transmission (3) according to claims 4 to 8, characterized in that The input element (4) is designed as a hollow shaft, wherein the first output shaft (5) extends through the input element (4).

10. The differential transmission (3) according to claims 4 to 9, characterized in that The input element (4) and the first sun gear (11) are formed as an integral piece.

11. The differential transmission (3) according to one of the preceding claims, characterized in that: The sun gear (32) is annular. The first ring gear (14) is arranged radially inside the second sun gear (21), and the first ring gear (14) overlaps with the second sun gear (21) in the axial direction.

12. The differential transmission (3) according to one of the preceding claims, characterized in that: The second output shaft (6) is coaxial with the first output shaft (5) and is arranged opposite to the first output shaft (5) in the axial direction.

13. The differential transmission (3) according to one of the preceding claims, characterized in that: The torque introduced into the first sun gear (11) can be transmitted to the first output shaft (5) and the second output shaft (6).

14. A drive unit (2) having a motor (73) and a differential transmission (3) according to one of the preceding claims, wherein The motor (73) is coupled to the differential transmission (3) so as to drive the first sun gear (11).

15. A vehicle comprising: a drive unit (2) according to claim 14; and a drive wheel (71), wherein The drive unit (2) is installed in the vehicle (1) so as to drive the drive wheels (71).

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