Electromechanical derailleur

Patent metadata

Field	Value
Publication number	US-11312449-B2
Application number	US-201916412667-A
Country	US
Kind code	B2
Filing date	May 15, 2019
Priority date	May 15, 2018
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

An Actuating device for a bicycle is provided. The actuating device may include a static element which is positionally fixed in relation to a bicycle frame, a movable element which is movable in relation to the static element, an electromechanical drive which provides drive force for a movement of the movable element. The electromechanical drive has a motor and a gearing driven by the motor. The gearing may include a first gearing wheel and a second gearing wheel which is in engagement with the first gearing wheel.

First claim

We claim:

1. An actuating device for a bicycle, comprising:
a static element which is arranged positionally fixed in relation to a bicycle frame,
a movable element which is movable in relation to the static element,
an electromechanical drive which provides drive force for a movement of the movable element, wherein the electromechanical drive has a motor and a gearing driven by the motor,
wherein the gearing comprises a first gearing wheel and a second gearing wheel which is in engagement with the first gearing wheel,
wherein the second gearing wheel comprises two partial wheels each with the same number of teeth, which partial wheels are both simultaneously in engagement with the first gearing wheel,
wherein the partial wheels are rotatable about the same axis of rotation and are preloaded relative to one another by a force in a direction of rotation about the axis of rotation, and
wherein the gearing includes a rotational position detection device including a third gearing wheel which is in engagement with the second gearing wheel, in particular with both partial wheels of the second gearing wheel, and which bears a sensor element of the rotational position detection device.

2. The actuating device according to claim 1 , characterized in that the force is generated by a force-generating device which is arranged functionally between the two partial wheels so as to be supported at one side on a first partial wheel of the two partial wheels and supported at the other side on a second partial wheel of the two partial wheels.

3. The actuating device according to claim 1 , characterized in that a first partial wheel of the two partial wheels is mounted with a predetermined first radial play relative to the axis of rotation and a second partial wheel of the two partial wheels is mounted with a predetermined second radial play, which is smaller than the first radial play, or without radial play, relative to the axis of rotation.

4. The actuating device according to claim 1 , wherein the gearing is driven by the motor and wherein the gearing has at least one stepped tooth wheel with at least two coaxial toothed wheels with different numbers of teeth,
wherein the two toothed wheels of the stepped tooth wheel each have a central opening into which a gearing shaft is inserted.

5. The actuating device according to claim 4 , wherein the material of the gearing shaft has a lower hardness than the material of at least one of the two toothed wheels.

6. The actuating device according to claim 4 , wherein at least one of the two toothed wheels is held rotatably on the gearing shaft.

7. The actuating device according to claim 4 , wherein the two toothed wheels are held rotationally conjointly relative to one another or are formed integrally with one another.

8. An actuating device according to claim 1 , wherein the electromechanical drive comprises a housing and the motor is fastened in the housing, and the device further includes:
a motor carrier, wherein the motor carrier has first fastening means for the fastening of the motor carrier to the housing and has second fastening means which are separate from the first fastening means and which serve for the fastening of the motor to the motor carrier.

9. The actuating device according to claim 8 , wherein the motor carrier is at least partially embedded into the material of the housing.

10. The actuating device according to claim 8 , wherein the motor carrier is held in positively locking fashion and without play in a matching aperture of the housing.

11. The actuating device according to claim 8 , wherein the motor carrier is fastened by means of a screw connection or an adhesive connection to the housing.

12. The actuating device according to claim 8 , wherein the housing is formed from a plastics material and the motor carrier is formed from metal.

13. The actuating device according to claim 4 , wherein the gearing includes an overload clutch which is arranged between a drive source of the electromechanical drive and an output member of the electromechanical drive.

14. The actuating device according to claim 13 , wherein the overload clutch is a slipping clutch.

15. The actuating device according to claim 14 , wherein the overload clutch is located between the two toothed wheels of the stepped tooth wheel.

16. The actuating device according to claim 15 , wherein the overload clutch includes a first clutch disk connected to a small wheel of the stepped tooth wheel, and a second clutch disk connected to a large wheel of the stepped tooth wheel.

17. The actuating device according to claim 16 , wherein the first clutch disk and the second clutch disk are in frictional engagement with one another.

18. The actuating device according to claim 1 , wherein the sensor element of the position detection device is an encoder which is configured to magnetically or optically interact with a reader.

19. The actuating device according to claim 18 , wherein position detection device is configured to read the position of the first gearing wheel by detection of the rotational position of the third gearing wheel.

Assignees

• Sram De Gmbh

Inventors

• Dueweling Sebastian
• Reinbold Matthias
• Boehm Robert
• Baumann Sven
• Schmelzing Sven

Classifications

• B62M25/08

  with electrical or fluid transmitting systems · CPC title

• B62M9/122 Primary

  electrically or fluid actuated; Controls thereof · CPC title

• B62M9/123

  changing gears automatically · CPC title