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EP-4741201-A1 - DRIVE, TRANSPORT VEHICLE AND USE

EP4741201A1EP 4741201 A1EP4741201 A1EP 4741201A1EP-4741201-A1

Abstract

The invention relates to a drive (2) for a wheel-driven vehicle, comprising a planetary gear (20) with a sun gear (22), a ring gear (24), a planet carrier (26), and planet gears (28) supported by the planet carrier (26) and meshing with the sun gear (22) and ring gear (24); an electric motor (10) for driving the sun gear (22); a wheel (70) non-rotatably connected to the ring gear (24); and an electromechanical brake (50) for braking the sun gear (22) and/or a drive shaft (12) of the electric motor (12) providing the sun gear (22), wherein the sun gear (22) is arranged between the brake (50) and the electric motor (10) and/or the brake (50) is received by an axial recess of the planetary gear (20).

Inventors

  • Vollhardt, Henrik
  • ERLICH, Markus, Dr.

Assignees

  • STXI Motion Ltd

Dates

Publication Date
20260513
Application Date
20241109

Claims (15)

  1. Drive (2) for a wheel-driven vehicle, the drive (2) comprising a planetary gear (20) with a sun gear (22), a ring gear (24), a planet carrier (26) and planet gears (28) carried by the planet carrier (26) and meshing with the sun gear (22) and ring gear (24); an electric motor (10) to drive the sun wheel (22); a wheel (70) connected to the ring gear (24) in a rotationally fixed manner; and an electromechanical brake (50) for braking the sun gear (22) and/or a drive shaft (12) of the electric motor (12) providing the sun gear (22), wherein the sun gear (22) is arranged between the brake (50) and the electric motor (10) and/or the brake (50) is received by an axial recess of the planetary gear (20).
  2. drive (2) according to the preceding claim, comprising at least two bearings (40) for supporting the ring gear (24) on the planet carrier (26).
  3. drive (2) according to the preceding claim, wherein the planet carrier (26) is designed with two cheeks (30) and one of the at least two bearings (40) is arranged on both cheeks (30) of the planet carrier (26).
  4. drive (2) according to one of the two preceding claims, wherein at least one of the at least two bearings (40) is arranged between two axial edges (72) of the wheel (70), and optionally a first axial center (47) located between all bearings of at least two bearings (40) is arranged between the two axial edges (72) of the wheel (70).
  5. drive (2) according to the preceding claim, wherein the first axial center (47) coincides at least substantially with a second axial center (78) of the wheel (70), preferably is positioned away from the second axial center (78) by no more than 20% of an axial width (76) of the wheel (70).
  6. drive (2) according to one of the preceding four claims, wherein an internal toothing (25) of the ring gear (24) in the axial direction between two bearings (40) of which at least two bearings (40) are arranged, and the planet gears (28) mesh with the internal teeth (25) and with an external teeth (23) of the sun gear (22) between the two bearings (40) of the at least two bearings (40).
  7. drive (2) according to one of the preceding claims, wherein a rotor of the brake (52) is mounted on the drive shaft (12) to transmit torque.
  8. drive (2) according to one of the preceding claims, wherein The rotor of the brake (52) is connected to the drive shaft (12) via a keyway connection.
  9. drive (2) according to one of the preceding claims, wherein the planetary gear carrier (26) is fixed relative to a motor housing (14) and optionally the brake (50), in particular connected to the motor housing (14) and optionally the brake (50).
  10. drive (2) according to one of the preceding claims, wherein the wheel (70) surrounds the brake (50) and the brake (50) is arranged between the two axial edges (72) of the wheel (70).
  11. drive (2) according to one of the preceding claims, comprising a hub cap (36) to cover the brake (50).
  12. drive (2) according to one of the preceding claims, wherein the ring gear (24) has a contact surface (32) for transmitting a support load, which is at least partially cylindrical around the axis of rotation of the sun gear (22) and is provided for connection with a rim (60) of the wheel (70), and the contact surface (32) which surrounds at least two bearings (40) and/or is arranged radially outside of the at least two bearings (40).
  13. drive (2) according to one of the preceding claims, wherein the wheel (70), in particular a/the rim (60) of the wheel (70), has an inner surface (62) contacting the hollow wheel (24), the inner surface (62) has several projections (64) engaging in the ring gear (24), and the projections (64) extend over less than 50% of an axial width (76) of the rim (60).
  14. Use of several drives (2) according to one of claims 1 to 13 as wheel drives or wheel hub gear motors of a driverless transport vehicle (1), in particular for driving the transport vehicle (1).
  15. Driverless transport vehicle (1) with multiple drives (2) according to one of claims 1 to 13.

Description

The following aspects relate to a drive for a wheel-driven vehicle, wherein the drive comprises a planetary gear, an electric motor and a wheel; to a driverless transport vehicle with a drive; and to a use of a drive. It is known from the prior art that wheel-driven vehicles require drive systems that ensure high efficiency and reliability. However, known drive systems have disadvantages in terms of their structural complexity and efficiency. Furthermore, known drive systems are comparatively large or not very compact. It is therefore a challenge to provide solutions that not only ensure efficient power transmission but also enable compact integration. In particular, the disadvantages of the state of the art should be avoided or at least substantially reduced. The present problem is solved by the features of the independent claims. Advantageous embodiments are defined in the dependent claims, the description, and the drawings. Where technically feasible, the disclosures of the description, the drawings, and the claims may be combined as desired. In particular, the task is solved by a drive for a wheel-driven vehicle, comprising a planetary gear with a sun gear, a ring gear, a planet carrier and planet gears carried by the planet carrier and meshing with the sun gear and ring gear; an electric motor to drive the sun wheel; a wheel rigidly connected to the ring gear; and an electromechanical brake for braking the sun gear and/or a drive shaft of the electric motor that provides the sun gear wherein the sun gear is arranged between the brake and the electric motor and/or the brake is received by an axial recess of the planetary gear and/or by the wheel or in the wheel. In other words, for example, the invention relates to an electric wheel drive. The wheel drive comprises a motor and a planetary gear set with a sun gear driven by the motor, a ring gear, and a planet carrier that holds several planet gears which mesh with the sun gear and the ring gear. The ring gear is connected directly or indirectly to a wheel or tire, for example, a rubber or plastic tire, which transmits the drive force originating from the motor and transmitted via the planetary gear set to a surface. A brake is also provided, which can introduce a braking force into the wheel via the planetary gear set. The brake is compactly arranged within the wheel or away from the electric motor, making it particularly accessible. The proposed solution aims to create the most compact drive possible. By allowing the wheel to rotate together with the ring gear, or by connecting it to it in a rotationally fixed manner, and specifically not to the planet carrier or the sun gear, the axial length of the drive can be reduced. Essentially, the wheel can surround the ring gear and be connected to it directly or indirectly in a torque-transmitting manner. The rotationally fixed connection between the wheel and the ring gear allows for optimal use of the radially available installation space. In particular, bearings and other components can be positioned in a space-saving manner, and a reduction in the axial overall length can be achieved. For example, in previously known drives, the planetary gear carrier is often connected to the wheel, while the electric motor is connected to the sun gear. The ring gear is usually stationary and, in particular, rigidly connected to the electric motor. Deviating from this known concept, the invention revealed that it is possible to connect the ring gear to the wheel in a rotationally fixed manner. In particular, in a two-sided planetary gear carrier, a bearing can be arranged on each of the cheeks of the planetary gear carrier, so that high radial loads can be accommodated and a bending moment or a tilting moment at the drive can be reduced. Depending on the design, the proposed solution may allow access to the planetary gear through the wheel, for example for maintenance. The brake is positioned for easy access during maintenance. A drive system, for example, refers to a device or system that provides driving force or torque to one or more wheels or traction wheels of a vehicle. In particular, the drive system is a wheel hub drive, wheel hub motor, or hub gear motor. Typically, the drive system can convert electrical energy into mechanical and thermal energy. It can comprise various mechanical and electrical components that work together to enable the movement of a vehicle. For example, the drive system includes at least one motor, at least one wheel, and at least one transmission for connecting the motor to the wheel. The drive system, especially the motor and/or transmission, can be structurally integrated to support part of the vehicle's weight. The type of vehicle includes, in particular, those vehicles that can be driven by or via wheels or traction wheels. A wheel-driven vehicle, for example, is one in which the vehicle's movement is achieved by driving one or more of its traction wheels. For example, the vehicle is