Harmonic drive

Patent metadata

Field	Value
Publication number	US-11313448-B2
Application number	US-201816626631-A
Country	US
Kind code	B2
Filing date	May 16, 2018
Priority date	Jun 27, 2017
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

A harmonic drive including a housing component (4) and a drive element (18) which is held on the housing component, can be deformed by a wave generator (14), is in the form of a flanged bushing and has a toothing region (17) having a cylindrical basic shape and a disc section (19) which adjoins the toothing region (17). Adjoining the disc section (19) there is a bushing section (20) which is concentric to the toothing region (17), overlaps the latter in the axial direction and is held interlockingly between a cylindrical edge section (21), which is thick-walled in comparison with the bushing section (20), of the housing component (4) and an intrinsically rigid component (22) which is likewise solid in comparison with the flanged bushing (18).

First claim

The invention claimed is:

1. A harmonic drive, comprising:
a housing component;
a drive element held on said housing component, said drive element is deformable by way of a wave generator, is configured as a flanged bushing, and has a toothing region with a cylindrical basic form and a disk section which adjoins the toothing region;
a bushing section adjoins the disk section, the bushing section is concentric with respect to the toothing region, overlaps the toothing region in an axial direction, is held in a positively locking manner between a cylindrical, thick-walled, in comparison with the bushing section, edge section of the housing component and a solid, in comparison with the flanged bushing, inherently rigid component, and is adapted to permit a relative rotation in the case of high torques up to a positively locking connection between the bushing section and the housing component or the rigid component.

2. A harmonic drive comprising:
a housing component;
a drive element held on said housing, said drive element is deformable by way of a wave generator, is configured as a flanged bushing, and has a toothing region with a cylindrical basic form and a disk section which adjoins the toothing region;
a bushing section adjoins the disk section, the bushing section is concentric with respect to the toothing region, overlaps with the toothing region in an axial direction, is held in a frictionally locking manner, in case of low torques, between a cylindrical, thick-walled, in comparison with the bushing section, edge section of the housing component and a solid, in comparison with the flanged bushing, inherently rigid component, and is adapted to permit a relative rotation in case of high torques up to a positively locking connection between the bushing section and the housing component or the rigid component.

3. The harmonic drive as claimed in claim 1 , wherein the bushing section has a wave profile.

4. The harmonic drive as claimed in claim 3 , wherein the wave profile has radial extreme points which bear against the housing component and against the solid, inherently rigid component.

5. The harmonic drive as claimed in claim 3 , wherein the wave profile has flank points which make contact with the housing component and the solid, inherently rigid component.

6. The harmonic drive as claimed in claim 1 , wherein the bushing section is configured as a tooth profile.

7. The harmonic drive as claimed in claim 6 , wherein a tooth profile of the deformable drive element engages into a toothing structure of the housing component, a plurality of teeth of the housing component engaging into a single tooth gap of the bushing section of the deformable drive element.

8. The harmonic drive as claimed in claim 1 , wherein a disk is provided as the solid, inherently rigid component which, together with the housing component, fixes the bushing section of the deformable drive element by a positively locking press joint.

9. The harmonic drive as claimed in claim 8 , wherein the disk is configured as an axial bearing washer for axial support of an output internal gear which interacts directly with the deformable drive element or as a rotational angle limiting disk which interacts with the output internal gear.

10. The harmonic drive as claimed in claim 1 , wherein the harmonic drive forms an actuating mechanism of an internal combustion engine.

11. The harmonic drive as claimed in claim 2 , wherein the bushing section has a wave profile.

12. The harmonic drive as claimed in claim 11 , wherein the wave profile has radial extreme points which bear against the housing component and against the solid, inherently rigid component.

13. The harmonic drive as claimed in claim 11 , wherein the wave profile has flank points which make contact with the housing component and the solid, inherently rigid component.

14. The harmonic drive as claimed in claim 2 , wherein the bushing section is configured as a tooth profile.

15. The harmonic drive as claimed in claim 14 , wherein a tooth profile of the deformable drive element engages into a toothing structure of the housing component, a plurality of teeth of the housing component engaging into a single tooth gap of the bushing section of the deformable drive element.

16. The harmonic drive as claimed in claim 2 , wherein a disk is provided as the solid, inherently rigid component which, together with the housing component, fixes the bushing section of the deformable drive element by a positively locking press joint.

17. The harmonic drive as claimed in claim 16 , wherein the disk is configured as an axial bearing washer for axial support of an output internal gear which interacts directly with the deformable drive element or as a rotational angle limiting disk which interacts with the output internal gear.

18. The harmonic drive as claimed in claim 2 , wherein the harmonic drive forms an actuating mechanism of an internal combustion engine.

Assignees

• Schaeffler Technologies Ag

Inventors

• Weber Jurgen
• Hildebrand Marco
• Heise Daniel

Classifications

• F16D3/00

  Yielding couplings, i.e. with means permitting movement between the connected parts during the drive (couplings disconnectable simply by axial movement F16D1/10; slip couplings F16D7/00) · CPC title

• F16H49/001 Primary

  Wave gearings, e.g. harmonic drive transmissions · CPC title

• F16D7/00 Primary

  Slip couplings, e.g. slipping on overload, for absorbing shock (combined with yielding shaft couplings F16D3/14; fluid slip couplings F16D31/00 - F16D35/00) · CPC title

• F16H2049/003

  Features of the flexsplines therefor · CPC title

• F16D7/002

  the torque being transmitted and limited by yielding of an elastomeric race · CPC title