Chain gypsy for a rear derailleur of a derailleur of a bicycle and the rear derailleur with such a chain gypsy

摘要

The invention relates to a chain gypsy (28, 30) for a rear derailleur (24) of a chain transfer of a bicycle for guiding a chain (12), comprising– an annular roller body (50) with a central opening (52) for the rotatable mounting of about a pivot axis (z) of the chain gypsy (28, 30);– a toothing (54) with a plurality of radially projecting teeth (56), on an outer peripheral surface of the roller body (50) are arranged,wherein between two adjacent teeth in the peripheral direction (56) in each case a tooth space (60) is arranged,individual teeth (56) in the region of a root circle (62) of the gear teeth (54) a predetermined on the chain (12) adapted to the tooth width (a).To improve the guidance properties, it is provided that the chain gypsy (28, 30) on at least a part of the tooth spaces (60) in the region in the vicinity of a teeth gap bottom (64) or / and at least a portion of the teeth (56) at least one guide portion (66; 70, 72; 80) having a relatively large width (a + x), than the tooth width (a) of at least one of the adjacent teeth (56).