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DE-102024132969-A1 - Transmission, drivetrain and vehicle

DE102024132969A1DE 102024132969 A1DE102024132969 A1DE 102024132969A1DE-102024132969-A1

Abstract

The invention relates to a transmission (16) for a vehicle (10) comprising an input shaft (18), a first and a second output shaft (22, 24), and a first, second, and third planetary gear set (30, 40, 50). A first rotating element of the first planetary gear set (30) is mechanically connected to the input shaft (18). A second rotating element of the first planetary gear set (30) is mechanically connected to the first output shaft (22). A third rotating element of the first planetary gear set (30) is permanently and rotationally fixed to a third rotating element of the third planetary gear set (50). A second rotating element of the third planetary gear set (50) and a first rotating element of the second planetary gear set (40) are fixed to a stationary component (26). A first rotating element of the third planetary gear set (50) is permanently and rotationally fixed to a third rotating element of the second planetary gear set (40). A second rotating element of the second planetary gear set (50) is mechanically connected to the second output shaft (24).

Inventors

  • Philipp Rechenbach

Assignees

  • ZF FRIEDRICHSHAFEN AG

Dates

Publication Date
20260513
Application Date
20241112

Claims (12)

  1. Transmission (16) for a vehicle (10), wherein the transmission (16) comprises an input shaft (18), a stationary component (26), a first output shaft (22), a second output shaft (24), a first planetary gear set (30), a second planetary gear set (40), and a third planetary gear set (50), wherein a first rotating element (32) of the first planetary gear set (30) is mechanically connected to the input shaft (18), wherein a second rotating element (34) of the first planetary gear set (30) is mechanically connected to the first output shaft (22), wherein a third rotating element (36) of the first planetary gear set (30) is permanently and rotationally fixed to a third rotating element (56) of the third planetary gear set (50), wherein a second rotating element (54) of the third planetary gear set (50) is fixed to the stationary component (26), and wherein a first rotating element (52) of the third planetary gear set (50) is permanently connected to a third rotating element (46) of the second planetary gear set (40) in a rotationally fixed manner, wherein a second rotating element (44) of the second planetary gear set (50) is mechanically connected to the second output shaft (24), and wherein a first rotating element (42) of the second planetary gear set (40) is fixed to the stationary component (26).
  2. gearbox after Claim 1 , characterized in that the third planet gear set (50) is arranged radially outside the second planet gear set (40).
  3. gearbox after Claim 2 , characterized in that the second planet gear set (40) and the third planet gear set (50) are radially stacked and the first planet gear set (30) is arranged axially offset to the second planet gear set (40) and the third planet gear set (50).
  4. gearbox after Claim 3 , characterized in that the second planet gear set (40) and the third planet gear set (50) overlap axially.
  5. Gearbox (16) according to one of the Claims 2 until 4 , characterized in that the first planet gear set (30) extends radially at least to the third planet gear set (50).
  6. Gearbox (16) according to one of the preceding claims, characterized in that the stationary component is designed as a housing (26), wherein the first planetary gear set (30) extends radially extending to nearly an inner wall in a first sub-area of the housing (26), wherein the third planetary gear set (50) extends radially to nearly an inner wall in a second sub-area of the housing (26), and wherein an inner diameter of the housing (26) is substantially the same in the first sub-area and in the second sub-area.
  7. Gearbox (16) according to one of the preceding claims, characterized in that the first rotating element of the first planet gear set (30) is designed as the first sun gear (32), the second rotating element of the first planet gear set (30) is designed as the first planet carrier (34), the third rotating element of the first planet gear set (30) is designed as the first ring gear (36), the first rotating element of the second planet gear set (40) is designed as the second sun gear (42), the second rotating element of the second planet gear set (40) is designed as the second planet carrier (44), the third rotating element of the second planet gear set (40) is designed as the second ring gear (46), the first rotating element of the third planet gear set (50) is designed as the third sun gear (52), the second rotating element of the third planet gear set (50) is designed as the third planet carrier (54), and the third rotating element of the third planet gear set (50) is designed as the third ring gear (56).
  8. Gearbox (16) according to one of the preceding claims, characterized in that an amount of a stationary gear ratio of the first planetary gear set (30) is greater than an amount of a stationary gear ratio of the second planetary gear set (40) and an amount of a stationary gear ratio of the third planetary gear set (50).
  9. Transmission (16) according to one of the preceding claims, characterized in that the transmission is designed as a differential transmission (16) and has a differential lock (60) for locking the differential transmission (16).
  10. Transmission (16) according to one of the preceding claims, characterized in that the transmission (16) is designed with a self-locking effect.
  11. Drive train for a vehicle (10), wherein the drive train (10) comprises a drive motor (14) and a transmission (16) according to one of the preceding claims, wherein the drive train is designed for torque transmission from the drive motor (14) to the input shaft (18).
  12. Vehicle (10) with a transmission (16) according to one of the Claims 1 until 10 or a powertrain Claim 11 .

Description

Technical field The present invention relates to a transmission for a vehicle. Furthermore, the invention relates to a drivetrain and a vehicle. State of the art Differential gears in motor vehicles allow the wheels on one side of an axle to rotate at a different speed than the wheels on the other side of the axle. This can improve the vehicle's cornering performance. However, conventional differential gears require a relatively large installation space. Description of the invention A first aspect concerns a transmission for a vehicle. The vehicle can be a motor vehicle, for example, a passenger car, truck, construction machine, or agricultural machine. The transmission can be a differential transmission. The differential transmission can be a transverse or longitudinal differential. Alternatively or in addition to the differential functionality, the transmission can provide a transmission ratio function. For example, the transmission can increase or decrease an input signal. In one embodiment, the transmission is designed as a reduction gear. In this embodiment, the differential functionality and the transmission ratio function can be integrated and provided by a single gear set. The transmission has an input shaft, a first output shaft, and a second output shaft. Furthermore, the transmission has a stationary component, such as a transmission housing. A stationary component is, for example, immobile relative to other transmission components. Drive power can be supplied to the input shaft. The drive power can be distributed to the two output shafts, for example, to drive the edges of an axle or to drive different axles. The output shafts can rotate at different speeds, for example, when the vehicle is cornering. The transmission can transmit motor power from a motor shaft to the two output shafts and thus function as a transfer case. The two output shafts can be mechanically connected to the input shaft for torque transmission. The two output shafts can be arranged coaxially. The input shaft can be arranged coaxially with one or both output shafts. A drive motor can be connected to or connectable to the input shaft. For example, the drive motor can be an electric machine. The drive motor can be arranged coaxially with the input shaft. The drive motor can also be aligned transversely to the input shaft and, for example, be mechanically connected to the input shaft via a bevel gear stage. The transmission comprises a first planetary gear set, a second planetary gear set, and a third planetary gear set. The respective axes of rotation of the planetary gear sets can be coaxial with each other. The planetary gear sets can be arranged coaxially with the input shaft and the two output shafts. Each planetary gear set can have three rotating elements. A planetary gear set can be free of more than three rotating elements. The planetary gear sets can be designed, for example, as positive planetary gear sets or negative planetary gear sets. A positive planetary gear set has a positive fixed gear ratio, and a negative planetary gear set has a negative fixed gear ratio. The three rotating elements can be formed, for example, by a sun gear, a planet carrier, and a ring gear. All rotating elements of all planetary gear sets can be arranged coaxially with each other. One or more planet gears can be rotatably mounted on the planet carrier. In a negative planetary gear set, the planet gears can mesh with, for example, the sun gear and the ring gear. In a positive planetary gear set, two sets of planet gears can be provided. The planet gears of the first set can mesh with the sun gear and, in pairs, with the planet gears of the second set. The planet gears of the second set can mesh with the ring gear and, correspondingly, in pairs with the planet gears of the first set. Each of the planet gear sets can also be designed as a stepped planetary gear set. In a stepped planetary gear set, the planet gears can have tooth sections with different effective diameters. For example, a first tooth section can mesh with the sun gear and a second tooth section with the ring gear. Due to the stepped planetary design, the differential can be radially more compact for the same gear ratio. The planetary gear sets can provide both the gear ratio and differential functionality described above in a compact design with few components. Furthermore, the transmission can thus have a compact form factor. The differential can be free of any planet gear sets other than those mentioned here. A first rotating element of the first planetary gear set is mechanically connected to the input shaft. Torque, rotational speed, and thus power from the drive motor can be applied to the input shaft. A second rotating element of the first planetary gear set is mechanically connected to the first output shaft. At least a portion of the applied power can be output here. A third rotating element of the first planetary gear set is permanently and rotationally fixed to a