| 摘要 |
PURPOSE: An external force measuring device is provided to accurately measure external force applied to a crank axle of a bicycle. CONSTITUTION: An external force measuring device is loaded on a bottom bracket assembly of a bicycle(4). The external force measuring device comprises a sleeve shell, a ring body, a sensor holding unit, and a hall sensing unit. The sleeve shell is inserted between a spindle(46) and a bottom bracket shell(45), has an outer cylindrical part and an inner cylindrical part, and is adjacently fitted in a right shell segment and an antifriction bearing unit. The ring body is arranged on the inner cylindrical part to move together and has a shifting section and an outer ring surface. The sensor holding unit is radially extended through the outer cylindrical part and forms a sensor activating zone facing the shifting section. |
