Coaxial gear

Patent metadata

Field	Value
Publication number	US-11674574-B2
Application number	US-202117546203-A
Country	US
Kind code	B2
Filing date	Dec 9, 2021
Priority date	Dec 9, 2020
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

A coaxial gear ( 1 ), includes an axially oriented tooth system ( 5 ) with respect to a rotational axis ( 3 ) of the coaxial gear ( 1 ), a tooth carrier ( 7 ) having axially oriented guideways ( 9 ), tooth pins ( 11 ) received within the guideways ( 9 ) for engaging with the tooth system ( 5 ), wherein the tooth pins ( 11 ) are axially oriented within the guideways ( 9 ) by their respective longitudinal axes and are mounted within the guideways ( 9 ) in an axially displaceable manner, and a cam disc ( 15 ) rotatable about the rotational axis ( 3 ) for axially driving the tooth pins ( 11 ), wherein a plurality of bearing segments ( 17 ) is disposed between the cam disc ( 15 ) and the tooth pins ( 11 ) for bearing the tooth pins ( 11 ), and wherein, on a side facing the tooth pins, the bearing segments ( 17 ) have an elevation at least in sections formed as a spherical cap for bearing the respective tooth pin ( 11 ).

First claim

The invention claimed is:

1. A coaxial gear ( 1 ), comprising
an axially oriented tooth system ( 5 ) with respect to a rotational axis ( 3 ) of the coaxial gear ( 1 ),
a tooth carrier ( 7 ) having axially oriented guideways ( 9 ),
tooth pins ( 11 ) received within the guideways ( 9 ) for engaging with the tooth system ( 5 ), wherein the tooth pins ( 11 ) are axially oriented within the guideways ( 9 ) by their respective longitudinal axes and are mounted within the guideways ( 9 ) in an axially displaceable manner, and
a cam disc ( 15 ) rotatable about the rotational axis ( 3 ) for axially driving the tooth pins ( 11 ),
wherein a plurality of bearing segments ( 17 ) is disposed between the cam disc ( 15 ) and the tooth pins ( 11 ) for bearing the tooth pins ( 11 ), and
wherein, on a side facing the tooth pins, the bearing segments ( 17 ) have an elevation ( 19 ) formed as a spherical cap for bearing the respective tooth pin ( 11 ).

2. The coaxial gear ( 1 ) according to claim 1 , wherein rolling elements ( 27 ) are disposed between the cam disc ( 15 ) and the bearing segments ( 17 ).

3. The coaxial gear ( 1 ) according to claim 2 , wherein a center point of the spherical cap coincides with a center of a running surface of the bearing segment.

4. The coaxial gear ( 1 ) according to claim 2 , wherein the rolling elements are formed as cylindrical rollers.

5. The coaxial gear ( 1 ) according to claim 1 , wherein the tooth pin ( 11 ) on its tooth base on the side of the bearing segment has a recess ( 21 ) formed as a concave spherical shape.

6. The coaxial gear ( 1 ) according to claim 5 , wherein a radius of the spherical cap of the elevation of the bearing segment is different from a sphere radius of the spherical shape of the tooth base of the tooth pin ( 11 ).

7. The coaxial gear ( 1 ) according to claim 2 , wherein the rolling elements are kept in a cage ( 26 ), which is suitable to follow a stroke of the cam disc in a permanently elastic manner.

8. The coaxial gear ( 1 ) according to claim 1 , wherein the bearing segments ( 17 ) have spaced side edges each running along a radius.

9. The coaxial gear ( 1 ) according to claim 8 , wherein the bearing segments have a running surface facing away from the tooth pins, which respectively have introduction chamfers ( 24 ) in the area of the edges.

10. The coaxial gear ( 1 ) according to claim 1 , wherein the tooth pins ( 11 ) each have a widened head area ( 51 ) as compared to a tooth body of the tooth pins ( 11 ).

11. The coaxial gear ( 1 ) according to claim 1 , wherein the cam disc ( 15 ) has a profiling ( 25 ) having a variable inclination angle of up to 10° of a vertical line ( 45 ) of the profiling towards the rotational axis ( 3 ).

12. The coaxial gear ( 1 ) according to claim 1 , further comprising an anti-twist ring ( 29 ) disposed between the tooth pins ( 11 ) and the bearing segments ( 17 ).

13. The coaxial gear ( 1 ) according to claim 12 , wherein the tooth pins ( 11 ) have a circular tooth body in cross-section, and a non-circular cross-section in an area of a tooth base for engaging with a correspondingly shaped opening in the anti-twist ring ( 29 ).

14. The coaxial gear ( 1 ) according to claim 12 , wherein the anti-twist ring ( 29 ) prevents the bearings segments ( 17 ) from twisting relative to one another.

15. The coaxial gear ( 1 ) according to claim 12 , wherein the anti-twist ring ( 29 ) comprises lugs in a direction of the cam disc ( 15 ) for positionally securing the bearing segments ( 17 ).

16. The coaxial gear ( 1 ) according to claim 1 , wherein the bearing segments ( 17 ) are realized as circular ring portions.

Assignees

• Wittenstein Se

Inventors

• Kimmelmann Martin
• Kümmeth Andreas
• Schmidt Michael
• Rossmeissl Thomas

Classifications

• F16H37/02 Primary

  comprising essentially only toothed or friction gearings · CPC title

• F16H49/00 Primary

  Other gearings · CPC title

• F16H49/001 Primary

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

• F16H25/06

  with intermediate members guided along tracks on both rotary members · CPC title