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DE-102018122809-B4 - Transmission device for a motor vehicle

DE102018122809B4DE 102018122809 B4DE102018122809 B4DE 102018122809B4DE-102018122809-B4

Abstract

Transmission device (1) for a motor vehicle, comprising a drive shaft (2) with a toothed section (2a), wherein the toothed section (2a) on the drive shaft (2) engages with an external toothed section (3a) of a ring gear (3), wherein the ring gear (3) further engages with planet gears (4) of a planet gear set via an internal toothed section (3b), wherein the planet gears (4) are rotatably mounted on a planet carrier (5) and in turn engage with a sun gear (6), and wherein optionally either the ring gear (3) or the planet carrier (5) can be connected to a spur gear shaft (8) via a switching device (7), wherein the spur gear shaft (8) is operatively connected to a first and second output shaft (10a, 10b) via a differential gear (9).

Inventors

  • Jürgen Bauer
  • Philip Wurzberger
  • Daniel Burghardt

Assignees

  • Schaeffler Technologies AG & Co. KG

Dates

Publication Date
20260513
Application Date
20180918

Claims (10)

  1. Transmission device (1) for a motor vehicle, comprising a drive shaft (2) with a toothed section (2a), wherein the toothed section (2a) on the drive shaft (2) engages with an external toothed section (3a) of a ring gear (3), wherein the ring gear (3) further engages with planet gears (4) of a planetary gear set via an internal toothed section (3b), wherein the planet gears (4) rotate bar are mounted on a planet carrier (5) and are in tooth mesh with a sun gear (6), and wherein optionally either the ring gear (3) or the planet carrier (5) can be connected to a spur gear shaft (8) via a switching device (7), wherein the spur gear shaft (8) is operatively connected to a first and second output shaft (10a, 10b) via a differential gear (9).
  2. Gearbox device according to Claim 1 , characterized in that the switching device (7) is designed to connect the ring gear (3) to the spur gear shaft (8) in a first gear stage (A) in a rotationally fixed manner, and to connect the planet carrier (5) to the spur gear shaft (8) in a rotationally fixed manner in a second gear stage (B).
  3. Gear unit according to one of the preceding claims, characterized in that the sun gear (6) is designed to be fixed to the housing.
  4. Gear unit according to one of the preceding claims, characterized in that the two output shafts (10a, 10b) are designed coaxially to the drive shaft (2), wherein the drive shaft (2) is designed as a hollow shaft, and wherein the first output shaft (10a) is guided axially through the drive shaft (2).
  5. Transmission device according to one of the preceding claims, characterized in that the differential transmission (9) is designed as a bevel gear differential (9a).
  6. Gearbox device according to one of the Claims 1 until 4 , characterized in that the differential gear (9) is designed as a spur gear differential (9b).
  7. Gear unit according to one of the preceding claims, characterized in that the spur gear shaft (8) is arranged coaxially to the sun gear (6) and to the ring gear (3) and parallel to the drive shaft (2).
  8. Gear unit according to one of the preceding claims, characterized by a gear ratio spread of at least 1.3 to at most 1.7.
  9. Gearbox device according to one of the preceding claims, characterized by an overall gear ratio greater than 6.
  10. Drive device for a motor vehicle, comprising an electric machine (11) connected via a drive shaft (2) to a transmission device (1) according to the Claims 1 until 9 is interconnected.

Description

The invention relates to a transmission device for a motor vehicle, in particular for an electric vehicle or a hybrid vehicle. Furthermore, the invention also relates to a drive device for a motor vehicle with an electric motor. The DE 10 2014 223 502 A1 Disclosing a drive arrangement, comprising an electric motor, wherein the electric motor with a rotor shaft defines a first axis, a differential device defining a second axis, the first and second axes being arranged parallel and offset from each other, and a gear section having at least two gears. The gear section is arranged in a torque path between the electric motor and the differential device, coaxial to one of the two aforementioned axes. The drive arrangement further comprises a gear stage section having an input gear and an output gear, the input gear being coaxial to the first axis and the output gear being coaxial to the second axis. The gear stage section has an intermediate gear assembly, the intermediate gear assembly being engaged with the input gear and the output gear. The gear stage section also has exactly one input gear. The CN 1 08 361 328 A Figure 1 shows a variable-speed drive axle system. This system includes a drive motor used to power the vehicle's hub rotation and a planetary gear mechanism whose input shaft is connected to the drive motor's output shaft. An actuator mounted on the planetary gear mechanism is used to disconnect or combine different elements of the mechanism to regulate the hub speed. The object of the present invention is to further develop a transmission device for a motor vehicle, and in particular to design it in a compact form. This object is achieved by the subject matter of claim 1. Preferred embodiments are described in the dependent claims. The transmission device according to the invention for a motor vehicle, in particular for an electric vehicle or hybrid vehicle, comprises a drive shaft with a toothed section, wherein the toothed section on the drive shaft engages with an external toothed section of a ring gear, wherein the ring gear further engages with planet gears of a planetary gear set via an internal toothed section, wherein the planet gears are rotatably mounted on a planet carrier and in turn engage with a sun gear, and wherein optionally either the ring gear or the planet carrier can be connected to a spur gear shaft via a switching device, wherein the spur gear shaft is operatively connected to a first and second output shaft via a differential. An electric vehicle is a motor vehicle for the transport of passengers and goods with an electric drive. Therefore, a drive system for an electric vehicle comprises an electric drive motor. A hybrid vehicle is also a motor vehicle for the transport of passengers and goods with two drive systems, one of which is electric. Thus, a drive system for a hybrid vehicle comprises at least one electric drive motor and/or at least one electric drive axle. The term "mechanically connected" means that two transmission elements can be directly connected to each other, or that further transmission elements, such as one or more shafts or gears, are located between two transmission elements. Two gears meshing with each other are designed to transmit torque and rotational speed from one gear to the other. A gear can be a planet gear, a sun gear, a ring gear, a spur gear, a toothed gear, a differential gear, or a bevel gear. A switching device is understood to be a coupling device that can couple and decouple at least two of three interacting shafts. In particular, when two shafts are coupled, the switching device is closed between them, thus preventing rotation between the two coupled shafts. When two shafts are decoupled, the switching device is open between them, allowing the two decoupled shafts to rotate relative to each other and thus preventing the transmission of rotational speed and torque. The switching device can incorporate either friction-locking or positive-locking couplings. In particular, the switching device is designed as a synchronization unit or a locking synchronization unit. Preferably, the switching device is actuated by an actuator to initiate the coupling or decoupling of any two of the three interacting shafts. The actuator can be hydraulically, electromechanically, electromagnetically, or, for example, pneumatically actuated. The invention includes the technical teaching that the switching device is configured to connect the ring gear to the spur gear shaft in a rotationally fixed manner in a first gear stage, and to connect the planet carrier to the spur gear shaft in a rotationally fixed manner in a second gear stage. Preferably, the switching device is configured to decouple the spur gear shaft from both the ring gear and the planet carrier in a further switching position in order to implement a power cut-off. A power cut-off is understood to mean a decoupling of the two output shafts from the input shaft. Coupling the spur gear shaft to th