BICYCLE WITH AUTOMATIC GEARSHIFT Russian patent published in 2010 - IPC B62M9/123 B62M25/02 F16D43/284 F03B17/00 F16H13/08 

FIELD: transport.

SUBSTANCE: invention refers to control facilities for automatic gearshift on bicycle when fluid pressure changes which operates when angular velocity changes with subsequent connecting auxiliary force from bushing of rotating wheel for rear gear selector operation. Spring-loaded control link (9) is rotated by bushing (8) of front wheel and is connected with device for shifting control link (9) depending on increase or decrease of bicycle speed. The device for shifting control link (9) contains circular screw (21) which is fixed relative to axis of the front wheel and circular channel (22) which is attached to control link (9). Circular screw (21) enters with gap into circular channel (22) with high-viscosity substance (23). Equilibrium of the link (9) between butt ends of half couplings (10, 11) is provided by spring and pressure of high-viscosity substance (23) which is charged by circular screw (21). When motion speed increases the pressure of charged substance (23) also increases, and the link (9) joins with threaded half clutch (11) movable on threaded axis section (7). Subsequent displacement of threaded half clutch (11) along axis (7) via cable (6) controls rear selector to switch chain from large sprocket to smaller sprocket. When motion speed decreases the pressure of charged substance (23) also decreases and the link (9) joins with reverse half clutch (10) which rotates threaded half clutch (11) in reverse direction via ball-type satellites (14). As a result of reverse displacement along axis (7), threaded half clutch (11) via cable (6) controls rear selector to switch chain from smaller sprocket to larger sprocket.

EFFECT: design simplification and dimensions and weight reduction.

2 dwg