Magnetic Repulsion Coupling for Transmission of a Rotational Movement from a Driving Member to a Driven Member

• US 20080217373A1
• Filed: 03/05/2008
• Published: 09/11/2008
• Est. Priority Date: 03/05/2007
• Status: Abandoned Application

• Current Assignee: Baruffaldi S.P.A.
• Original Assignee: Baruffaldi S.P.A.
• Inventors: Bellotti, Claudio, Natale, Fabio, Depoli, Erminio, Boffelli, Piercarlo
• Application Number:
  US12/042,802
• Publication Number:
  US 20080217373A1
• Time in Patent Office: Days
• US Class Current: 227/113
• CPC Class Codes: H02K 49/104 Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element

Abstract

Coupling for transmission of a rotational movement from a driving member to a driven member, comprising permanent magnets which are integral with the driving member and permanent magnets which are integral with the driven member, said permanent magnets having a matching polarity (N-N;S-S) and lying in respective radial planes parallel to the axis of rotation and situated opposite each other so that each pair of oppositely facing magnets produces a corresponding magnetic repulsion force. The magnet transmission force transmits the rotational movement from the driving member to the driven member.

Claims

1. A coupling for transmission of a rotational movement about an axis of rotation from a driving member to a driven member, the coupling comprising:

one or more permanent magnets coupled to the driving member and disposed in a radial plane parallel to the axis of rotation;

one or more permanent magnets coupled to the driven member and disposed in a radial plane parallel to the axis of rotation;

wherein the permanent magnets coupled to the driving member are situated opposite the permanent magnets coupled to the driven member and have the same magnetic polarity so that each pair of oppositely facing magnets produces a corresponding magnetic repulsion force.

2. A coupling according to claim 1, wherein the driving member includes at least one longitudinal extension in the form of a pulley.

3. A coupling according to claim 2, wherein the driving member includes a cylindrical opening.

4. A coupling according to claim 1, wherein the driving member includes two or more axial projections, each axial projection including a seat adapted to contain one or more of the permanent magnets.

5. A coupling according to claim 4, wherein the driven member includes two or more radial projections integral with the hub and each radial projection including a seat adapted to contain one or more of the permanent magnets, the permanent magnet contained by at least one radial projecting being opposite to the permanent magnet contained by at least one axial projection.

6. A coupling according to claim 5, wherein the axial projections of the driving member are arranged at regular angular distances around the axis of rotation and the radial projections of the driven member are arranged at regular angular distances around the axis of rotation.

7. A coupling according to claim 5, wherein the axial projections of the driving member and radial projections of the driven member are alternately arranged around the axis of rotation.

8. A coupling according to claim 5, wherein the coupling is mono-directional whereby the magnets of the driving member are arranged on one side of the axial projection in the same direction as the direction of rotation.

9. A coupling according to claim 5, wherein the coupling is bidirectional whereby the permanent magnets are arranged on both surfaces of the axial projections of the driving member and both surfaces of the driven member

10. A coupling according to claim 5, wherein the axial projections of the driving member and axial projections of the driven member extend axially along the axis of rotation.

11. A coupling according to claim 10, wherein at least one of the axial projections includes two or more seats and each seat includes a permanent magnet

12. A coupling according to claim 5, further comprising a safety stop member coupled to at least one of the radial projections of the driven member and circumferentially projecting from the magnet to prevent the magnet from contacting the driving member.

13. A coupling according to claim 5, wherein the axial projections and the radial projections are made of a magnetic material.

14. A coupling according to claim 5, wherein the axial projections and the radial projections are made of a non-magnetic material.

15. A coupling according to claim 14, wherein at least one permanent magnet is constrained to a seat by an adhesive.

16. A coupling according to claim 1, further comprising a safety stop arranged between the driving member and the driven member to prevent the permanent magnets coupled to the driving member from contacting the permanent magnets coupled to the driven member.

17. A coupling according to claim 1, wherein the driven member includes means for coaxially engaging the driven member.

18. A coupling according to claim 17, wherein the means for coaxially engaging the driving member includes a sleeve extending in a longitudinal direction along the axis of rotation and integral with a hub of the driving member.

19. A coupling according to claim 17, wherein the means for engagement with the driving member includes a shaft coaxially keyed onto the driving member.

20. A coupling according to claim 17, wherein the coaxial engagement means of the driven member is coaxially forced onto a bearing, the bearing having an outer thrust surface coupled to an inner surface of a cylindrical opening of the driving member.

21. A coupling according to claim 17, therein the coaxial engagement means of the driven member is coaxially forced onto a bushing.