Magnetorheological braking device

Patent metadata

Field	Value
Publication number	US-12529401-B2
Application number	US-202118248557-A
Country	US
Kind code	B2
Filing date	Oct 12, 2021
Priority date	Oct 13, 2020
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

A magnetorheological braking device has two braking components that are continuously rotatable relative to one another. A first braking component extends in the axial direction and the second braking component includes a hollow casing extending around the first braking component. A peripheral gap is filled with a magnetorheological medium. The first braking component has an electric coil and a magnetically conductive core which extends in the axial direction. A star contour with magnetic field concentrators on the core and/or on the shell part project into the gap, which results in a peripheral gap region with a variable gap height. The electric coil is wound around the core such that a magnetic field runs through the core and the magnetic field concentrators and through the gap into a wall of the casing. A star contour is formed by a stack of star plates.

First claim

The invention claimed is:

1 . A magnetorheological braking device, comprising:
a brake housing, a stationary mount, and at least two brake components including a first brake component and a second brake component; one of said brake components being connected to said mount in a rotationally fixed relationship, and said at least two brake components being continuously rotatable relative to one another; said first brake component extending in an axial direction and having a core of a magnetically conductive material that extends in the axial direction; said second brake component including a hollow casing part which extends about said first brake component, forming an encircling gap; a magnetorheological medium at least partially filling said encircling gap; an electric coil disposed in said brake housing; a star contour disposed between said casing part and said core, said star contour having magnetic field concentrators that protrude into said gap to form therein an encircling gap section having a variable gap height in a region of said star contour, and said star contour including at least one stack of star sheets.

2 . The magnetorheological braking device according to claim 1 , which comprises at least one disk contour formed between said casing part and said core, wherein a gap section is formed between said disk contour and said casing part, and wherein a gap height in said gap section of said disk contour is less variable than a gap height in said gap section of said star contour.

3 . The magnetorheological braking device according to claim 2 , wherein said gap section of said disk contour has a gap height which is substantially constant over a circumference.

4 . The magnetorheological braking device according to claim 2 , wherein said disk contour has a cylindrical outer contour.

5 . The magnetorheological braking device according to claim 2 , wherein said disk contour has an outwardly projecting outer contour on at least one axial side.

6 . The magnetorheological braking device according to claim 2 , wherein the gap section of said disk contour has a smaller gap height than a minimum gap height of said gap section of said star contour.

7 . The magnetorheological braking device according to claim 2 , wherein at least one of said star contour or said disk contour is configured to rotatably guide said casing part and to serve as a bearing point.

8 . The magnetorheological braking device according to claim 1 , wherein said core is formed with a rolling element section and rolling bodies are disposed between said rolling element section of said core and said shell part.

9 . The magnetorheological braking device according to claim 8 , wherein said rolling bodies consist of a magnetically conductive material.

10 . The magnetorheological braking device according to claim 8 , wherein a radial free space for accommodating a rolling element between said casing part and said rolling element section of said core is greater than a minimum gap height in said gap section of said star contour.

11 . The magnetorheological braking device according to claim 10 , wherein the radial free space for a rolling element in said rolling element section is more than twice as large as the minimum gap height in said gap section of said star contour.

12 . The magnetorheological braking device according to claim 1 , wherein said second braking component is axially displaceable on said first braking component.

13 . The magnetorheological braking device according to claim 12 , which comprises a clicking element at a distal end of a chamber accommodated in said brake housing.

14 . The magnetorheological braking device according to claim 13 , which comprises an elastic membrane separating the chamber from said clicking element.

15 . The magnetorheological braking device according to claim 13 , wherein said clicking element is a snap disk and wherein a change in a spanned volume of said snap disk is adapted to a cross-sectional area of the axle multiplied by an axial offset of the snap disk upon actuation.

16 . The magnetorheological braking device according to claim 1 , wherein said star contour is one of at least two star contours accommodated in said brake housing at an axial distance from one another.

17 . The magnetorheological braking device according to claim 16 , wherein at least two of said star contours have a different outer contour.

18 . The magnetorheological braking device according to claim 16 , wherein at least one of said star contours is a separate annular flange formed with radially projecting magnetic field concentrators.

19 . The magnetorheological braking device according to claim 1 , wherein said electric coil is at least one electric coil wound around an axle and configured to generate a magnetic field in the axial direction or said electric coil is at least one electric coil wound axially around said core and configured to generate a magnetic field in a radial direction.

20 . The magnetorheological braking device according to claim 19 , wherein said electrical coil is received radially between said core and said casing part and said electrical coil is fixed internally to said casing part or wound onto said core.

21 . The magnetorheological braking device according to claim 1 , wherein said at least one stack comprises a plurality of star sheets lying directly against one another.

22 . The magnetorheological braking device according to claim 1 , wherein said at least one stack comprises star sheets and disk sheets.

23 . The magnetorheological braking device according to claim 1 , wherein said stack comprises a plurality of stamped parts or consists of stamped parts.

24 . The magnetorheological braking device according to claim 1 , wherein at least one of said magnetic field concentrators has a cross-sectional area that tapers towards a distal end or is rounded at the distal end.

25 . The magnetorheological braking device according to claim 1 , wherein said magnetic field concentrators project radially into said gap and are formed by at least one of a plurality of arms of said core or a plurality of arms projecting from said casing part.

26 . The magnetorheological braking device according to claim 1 , wherein said star contour is formed with magnetic field concentrators that project radially outwards and are magnetically conductively attached to said core or wherein said star contour is formed with magnetic field concentrators that project radially inwards and are magnetically conductively attached to said casing part.

27 . The magnetorheological braking device according to claim 1 , wherein said magnetic field concentrators extend over at least one angular segment about an outer circumference of said core 69 , wherein each angular segment is less than 150°, and no magnetic field concentrator is arranged outside of the angular segment, and wherein said electrical coil is wound in an axial direction around said core outside of the angular segment.

28 . The magnetorheological braking device according to claim 1 , wherein a maximum diameter of said electrical coil in a radial direction within a coil plane is greater than a minimum diameter of said core in a radial direction transversely to the coil plane.

29 . The magnetorheological braking device according to claim 1 , further comprising a shiel

Assignees

• Inventus Eng Gmbh

Inventors

• Battlogg Stefan

Classifications

• G05G2505/00

  Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member · CPC title

• G05G5/03

  Means for enhancing the operator's awareness of arrival of the controlling member at a command or datum position; Providing feel, e.g. means for creating a counterforce (arrangements for indicating the position of the controlling member G05G1/015) · CPC title

• F16D2250/0023

  Shaping by pressure · CPC title

• F16D2200/0034

  non-metallic · CPC title

• F16D2129/08

  Electromagnets · CPC title