The present invention relates to a bicycle derailleur gear, particularly a front derailleur gear, with improved reliability that comprises a kinematic mechanism in the form of a four-bar linkage (11) with a base body (12) and a mobile body (14) connected together through a pair of connecting rods (13,15) hinged to the base body (12) and to the mobile body (14) at four pin elements (16,17,18,19), the mobile body (14) carrying a chain guide (21), the four-bar linkage-kinematic mechanism (11) being associated with derailleur gear actuation means (28) suitable for deforming the four-bar linkage-kinematic mechanism (11) so as to determine a displacement of the mobile body (14) with respect to the base body (12) and consequently a displacement of the chain guide (21), the derailleur gear actuation means (28) being of the motorized type and comprising a motor casing (30) and an outlet shaft (29) that projects directly from said motor casing (30) and characterised in that the actuation means (28) command a translation in the axial direction of the outlet shaft (29) with respect to the motor casing (30) and are mounted between distinct components (12,13,14,15) of the four-bar linkage-kinematic mechanism (11) through interposition of at least one tilting interface (26,36) about a fifth pin element (25) substantially parallel to the pin elements (16,17,18,19).


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    Title :

    Bicycle derailleur gear, particularly a front derailleur gear, with improved reliability


    Additional title:

    Fahrradkettenschaltung, insbesondere ein vorderer Umwerfer, mit verbesserter Zuverlässigkeit
    Engrenage de dérailleur de bicyclette, particulièrement un engrenage de dérailleur avant, avec fiabilité améliorée


    Contributors:

    Publication date :

    2016-09-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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