Electronic rear derailleur

Abstract

This invention relates to an electronic rear derailleur, comprising: a base member for mounting to a bicycle and having a receiving space; a movable member; a linkage mechanism pivotally connected between the base member and the movable member, including a first linkage group and a second linkage group; a motor assembly disposed in the receiving space; a battery unit, one end of which is connected to one of the movable member and the base member and located between the first linkage group and the second linkage group, and the other end of which has a connecting portion connected to the other of the movable member and the base member; and a chain guide disposed on the movable member.

Claims

1. An electronic rear derailleur, comprising: A base component for mounting to a bicycle, and having a receiving space; A movable component; a linkage mechanism pivotally connected between the base component and the movable component, including a first linkage group and a second linkage group; a motor assembly disposed in the accommodating space; a battery unit located between the first linkage group and the second linkage group, one end connected to one of the movable component and the base component, and the other end having a connecting portion connected to the other of the movable component and the base component; and a chain guide disposed on the movable component; wherein the first linkage group, the second linkage group, and the battery unit are movably and simultaneously connected to the movable component or simultaneously connected to the base component along a first rotation axis, a second rotation axis, and a third rotation axis, respectively; wherein the first rotation axis, the second rotation axis, and the third rotation axis are not coaxial.

2. The electronic rear derailleur as claimed in claim 1, wherein the first rotation axis, the second rotation axis, and the third rotation axis are arranged parallel to each other.

3. The electronic rear derailleur as claimed in claim 1, wherein the battery unit is spaced apart from the first linkage group and the second linkage group, respectively.

4. The electronic rear derailleur as claimed in claim 1, further comprising an elastic member elastically connected between the connecting portion and the base member.

5. The electronic rear derailleur as claimed in claim 4, wherein the elastic member normally elastically pulls the connection toward the base member.

6. The electronic rear derailleur as claimed in claim 3, wherein the connection is a fixed point located on the battery cell.

7. The electronic rear derailleur as claimed in claim 1, further comprising a wire electrically connected to the battery cell and the motor assembly.

8. The electronic rear derailleur as claimed in claim 7, wherein the base member has an outwardly open through-hole communicating with the receiving space, and the wire passes through the through-hole into the receiving space.

9. The electronic rear derailleur as claimed in claim 1, wherein the movable member has a first pivot portion, the battery cell has a second pivot portion, the first pivot portion and the second pivot portion are pivotally connected to each other by a shaft member that defines the third axis of rotation.

10. The electronic rear derailleur as claimed in claim 8, wherein the first rotation axis, the second rotation axis, and the third rotation axis are arranged parallel to each other; the battery unit is spaced apart from the first linkage group and the second linkage group respectively; the electronic rear derailleur further includes an elastic member elastically connected between the connecting portion and the base member; the elastic member normally elastically pulls the connecting portion toward the base member; the connecting portion is a fixed point located at the battery unit; the elastic member has a hook portion detachably fastened to the connecting portion; the movable member has a first pivot portion, the battery unit has a second pivot portion, the first pivot portion and the second pivot portion are pivotally connected to each other by a shaft member, the shaft member defining the third rotation axis; the second pivot portion abuts against the first pivot portion in one of the extension directions of the third rotation axis.

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