Search

EP-4742519-A1 - TORQUE TRANSMITTER

EP4742519A1EP 4742519 A1EP4742519 A1EP 4742519A1EP-4742519-A1

Abstract

In a torque transmitter comprising a first part (2) provided with a magnetic field source (8, 11) and a second part (1) made of a magnetic material rotatably mounted relative to the first part (2), the first part (2) has a radially inner section (4) and a radially outer section (3), wherein the radially outer and/or the radially inner section (3, 4) has first segments (10) arranged at a circumferential distance from one another, and second segments (5) of the second part (1) are arranged between the radially inner and the radially outer section (3, 4) of the first part (2), which can be brought into radial overlap with the first segments (10), such that a magnetic field emanating from the magnetic field source (8, 11) and existing between the radially outer and the radially inner section (3, 4) exerts a rotational or holding torque on the second part (1) which depends on the overlap between the first and second segments (5, 10).

Inventors

  • NEUGEBAUER, CHRISTIAN

Assignees

  • nengineering GmbH

Dates

Publication Date
20260513
Application Date
20251111

Claims (8)

  1. Torque transmitter comprising a first part (2) provided with a magnetic field source (8, 11) and a second part (1) made of a magnetic material rotatably mounted relative to the first part (2), characterized in that the first part (2) has a radially inner section (4) and a radially outer section (3), wherein the radially outer and/or the radially inner section (3, 4) has first segments (10) arranged at a circumferential distance from each other and second segments (5) of the second part (1) are arranged between the radially inner and the radially outer section (3, 4) of the first part (2), which can be brought into radial overlap with the first segments (10), so that a magnetic field emanating from the magnetic field source (8, 11) and existing between the radially outer and the radially inner section (3, 4) exerts a rotational or holding torque on the second part (1) which depends on the overlap between the first and second segments (5, 10).
  2. Torque transmitter according to claim 1, characterized in that the first and second segments (5, 10) have an identical circumferential division.
  3. Torque transmitter according to claim 1 or 2, characterized in that the first segments (10) are limited in circumferential direction on one or both sides by ramp-shaped transition sections (9) which have a slope defining an axial overlap with the second segments (5) that depends on the angle of rotation.
  4. Torque transmitter according to claim 1, 2 or 3, characterized in that in an annular gap between the The magnetic field source is arranged in the radial inner section (4) and the radial outer section (3).
  5. Torque transmitter according to one of claims 1 to 4, characterized in that the second part (1) is adjustable in the axial direction to change the axial extent of the overlap between the first and second segments (5, 10).
  6. Torque transmitter according to one of claims 1 to 5, characterized in that the first (2) and/or second part (1) has a U-shape, the parallel U-legs of which form the second segments (5).
  7. Torque transmitter according to one of claims 1 to 6, characterized in that the second segments (5) are arranged in a rotational position overlapping with the first segments (10) between the first segments (10) of the radially outer section (3) and the first segments of the radially inner section (4).
  8. Torque transmitter according to one of claims 1 to 7, characterized in that the first segments (10) and/or the second segments (5) extend parallel to a rotation axis (12) of the torque transmitter.

Description

The invention relates to a torque transmitter comprising a first part provided with a magnetic field source and a second part made of a magnetic material rotatably mounted relative to the first part. Torque transmitters are used in both switchable and non-switchable versions as couplings between two rotating elements, and as brakes between a stationary and a rotating element. In a switchable version with a preferred orientation of the elements, torque transmitters are also used as limited-angle torque (LAT) drives. Torque transmitters with a contact connection between the rotating elements are known as rigid couplings, elastic couplings or friction couplings. Torque transmitters with a contactless connection between the rotating elements are known as magnetic couplings, wherein one of the elements is equipped with a permanent magnet or an electromagnet formed from a coil and a body made of soft magnetic material, and the other element is either also equipped with magnets or with soft magnetic material. In the known embodiments, the torque transmission occurs by means of magnetic force across an axial or tangential air gap between these two elements. Disadvantages of contact-based torque transmitters include wear and noise generation. Disadvantages of known magnetic, contactless torque transmitters include their high mass and high moment of inertia relative to the transmissible torque. The aim of the invention is therefore to create a torque transmitter that transmits a torque between two elements, one of which is rotatably movable and the other of which is stationary or rotatably movable about the same axis. Furthermore, the invention aims to at least partially fulfill the following requirements. The torque transmitter should be either non-switchable or switchable. The torque transmitter should be non-contact between the elements. For electrically switchable versions, an electrically redundant version should be possible. The torque transmitter should be able to transmit high torque with a limited diameter. Low moment of inertia. Small number of parts and cost-effective construction. No slippage, i.e. a transfer ratio of 1:1. The torque limit should be adjustable by design. Furthermore, the torque curve should be adjustable across the angle of rotation; in particular, for use as a rotary drive, a relatively constant torque over wide angular ranges is desired, while for use as a coupling, a high peak torque at a small angle of rotation, and thus high torsional stiffness, is desired. The torque limit should be adjustable without any structural changes to the parts, by axially shifting the elements relative to each other. The torque transmitter should be usable as a clutch, brake or rotary drive with a limited rotation angle. To solve this problem, a torque transmitter of the type mentioned above essentially provides that the first part has a radially inner section and a radially outer section, wherein the radially outer and/or the radially inner section has first segments arranged at a circumferential distance from each other, and second segments of the second part are arranged radially between the radially inner and the radially outer section of the first part, which can be brought into radial overlap with the first segments, so that a magnetic field emanating from the magnetic field source and existing between the radially outer and the radially inner section exerts a rotational or holding torque on the second part, which depends on the overlap between the first and second segments. In the torque transmitter according to the invention, the second part of the torque transmitter is therefore designed with at least one second segment, which is arranged as a driver between two air gaps between the radially inner and the radially outer sections of the first part. The driver is, for example, made of a soft magnetic material and is divided circumferentially. The radially inner section and the radially outer section of the first part can also be made of a soft magnetic material. At least one of the sections of the first part is divided circumferentially to form the first segments. A magnetic field exists between the radially inner section and the radially outer section. The torque is transmitted by the tangential components of the magnetic force between the elements at at least one of the two air gaps. The magnetic field between the radially inner section and the radially outer section of the first part can preferably This is achieved by arranging the magnetic field source in an annular gap between the radially inner and radially outer sections. The magnetic field can be generated, for example, by a permanent magnet positioned between these sections or by at least one current-carrying coil wound tangentially. If the magnetic field is applied by a current-carrying coil, the torque transmission can be reduced by decreasing the current flow and switched off by interrupting the current flow. Electrical redundancy can b