Abstract: A bicycle rear derailleur is provided, which includes a base adapted to be mounted on a bicycle frame, a movable member, a linkage assembly pivotally connected to and between the base and the movable member, a pivot shaft provided within and pivotally rotatable relative to the movable member, a chain guide fixed to an end of the pivot shaft, a restriction assembly provided on the pivot shaft, and a friction assembly provided within the movable member to provide a rotational friction on the restriction assembly. Whereby, the chain guide is pivotally awing toward a first direction by a force; when the chain guide swings toward a second direction which is opposite to the first direction by another force, it is forced by a swing resistance.

Abstract: A bicycle rear derailleur has a mounting base, a moveable base, and a friction assembly. The moveable base has an axle. The friction assembly is mounted in the moveable base and has a driving disk, a driven disk, multiple rotating members, and a friction member. The driving disk is connected with the axle in a non-rotatable manner. The driven disk is rotatably and axially moveably mounted in the moveable base. Each disk has multiple curved rotating member guiding recesses. Each rotating member guiding recess of the driving disk has a depth decreased along a first rotating direction. Each rotating member guiding recess of the driven disk has a depth decreased along a second rotating direction. The rotating members are mounted respectively in the rotating member guiding recesses. The friction member is mounted in the moveable base in a non-rotatable manner and abuts the driven disk.

Abstract: A bicycle rear derailleur is provided, which includes a base adapted to be mounted on a bicycle frame, a movable member, a linkage assembly pivotally connected to and between the base and the movable member, a pivot shaft provided within and pivotally rotatable relative to the movable member, a chain guide fixed to an end of the pivot shaft, a restriction assembly provided on the pivot shaft, and a friction assembly provided within the movable member to provide a rotational friction on the restriction assembly. Whereby, the chain guide is pivotally awing toward a first direction by a force; when the chain guide swings toward a second direction which is opposite to the first direction by another force, it is forced by a swing resistance.

Abstract: A bicycle rear derailleur has a mounting base, a moveable base, and a friction assembly. The moveable base has an axle. The friction assembly is mounted in the moveable base and has a driving disk, a driven disk, multiple rotating members, and a friction member. The driving disk is connected with the axle in a non-rotatable manner. The driven disk is rotatably and axially moveably mounted in the moveable base. Each disk has multiple curved rotating member guiding recesses. Each rotating member guiding recess of the driving disk has a depth decreased along a first rotating direction. Each rotating member guiding recess of the driven disk has a depth decreased along a second rotating direction. The rotating members are mounted respectively in the rotating member guiding recesses. The friction member is mounted in the moveable base in a non-rotatable manner and abuts the driven disk.