Wheel-type resistance device for a bicycle exerciser

摘要

A wheel-type resistance device includes a flywheel which is rotated together with a hub member around an axle and which has an accommodation chamber indented axially to form a first circumferential portion that extends in a radial direction relative to the axle. A plurality of magnetically attractive members have magnetically permeable members thereon and are angularly displaced on the first circumferential portion. A dragging force adjusting member is mounted on the axle and is shiftable in the axial direction. The adjusting member has a left major surface with a second circumferential portion opposing the first circumferential portion for mounting a plurality of magnets so that the magnets will be drawn by the magnetically attractive members through the permeable members when the flywheel rotates. A shifting member is operable to shift the adjusting member away from the flywheel so as to decrease the dragging force imposed upon the rotation of the flywheel. A coil spring biases the adjusting member toward the flywheel against the action of the shifting member.