BICYCLE WITH AUTOMATIC GEAR SHIFT

摘要

FIELD: transport. ^ SUBSTANCE: invention relates to bicycle gear shift appliances operated at changes in angular velocity and using auxiliary force supplied by revolving wheel hub to make rear gear shift device operate. Hydraulic rear gear shift switch (2) and fixed axle (3) of rear wheel hub (4) with set (5) of various sprockets are fitted on frame (1). Spring-loaded control link (6) is arranged inside hub (4) to be driven thereby and interact with appliances (7, 8) that displace said control link (6) depending upon bicycle speed variation. Control link (6) interacts with hydraulic appliance that controls rear gear shift device (2). Said hydraulic appliance comprises piston (9) with rod and pipeline (10) incorporated with fixed axle (3) representing a hydraulic cylinder. Appliances (7, 8) that displace said control link (6) impart axial motion to piston (9) controlling pressure in pipeline (10) that extends from said fixed axle (3) and coupled with rear gear shift device (2). ^ EFFECT: higher reliability. ^ 2 dwg