AUTOMATIC TRANSMISSION (VERSIONS) Russian patent published in 2009 - IPC B62M25/00 

FIELD: instrument engineering.

SUBSTANCE: invention refers to handling of bicycle automatic transmission. A transmission comprises double-ended hub-shaft (112). Its ends rest upon a frame. In addition, it contains sun wheel (116) in its centre. Hub body (114) surrounds sun wheel (116) and is provided with first pawl ring (122) and internal toothing (124) made on an inner peripheral face of one edge of the hub body rotatable on hub-shaft (112). First driving unit (130) accommodates driving element (132) that enables rotation of hub body (114), covers the other edge thereof and moves on hub-shaft (112), and driven sprocket (134) used for rotation of driving element (132). Second driving unit (150) includes first gear carrier (152) embedded inside hub body (114) and comprising in one edge array of planetary pinions (156) geared with sun wheel (116) and internal toothing (124) to ensure spinning of the hub body. Second gear carrier (154) goes from the other edge of first gear carrier (152) to driving element (132). Conversion unit (170) comprises second pawl ring (172) between driving element (132) and second gear carrier (154) for rotary effort transfer from rotating driving element (132) to second gear carrier (154) and planetary pinions (156) of first gear carrier (152). Conversion spring (174) provides return of second pawl ring (172) when treadles are not activated, and a bicycle is stopped.

EFFECT: decision aims at simplification of transmission process.

26 cl, 15 dwg