Brush head assembly, transmission structure, and oral cleaning device

A transmission structure for an oral cleaning device, comprising:

• a brush head assembly having an outer side configured for connection to a functional element and an inner side provided with a movable disk, the movable disk being provided with a mating area offset from a center of the brush head assembly and a rotating shaft located at the center of the brush head assembly;
• and
• a motion-transmitting member including an input end connected to a transmission mechanism of the oral cleaning device and an output end adapted to the mating area, the output end being eccentrically arranged relative to a longitudinal axis of the input end;
• wherein, when the transmission mechanism drives the motion-transmitting member, the output end reciprocates with a variable diameter relative to a center of the movable disk, and the mating area drives the brush head assembly to oscillate reciprocally;
• and
• a maximum longitudinal reciprocating travel of the motion-transmitting member is 1-5 mm.

An oral cleaning device, comprising:

• a housing, a motion-transmitting member, and a brush head assembly, the motion-transmitting member being arranged inside the housing;
• wherein the brush head assembly is rotatably connected to an end of the housing, a functional element is arranged on one side of the brush head assembly, a movable disk is arranged on another side of the brush head assembly, the movable disk is provided with a mating area offset from a center of the brush head assembly;
• the motion-transmitting member includes an input end connected to a transmission mechanism of the oral cleaning device and an output end adapted to the mating area, the output end is eccentrically arranged relative to a longitudinal axis of the input end;
• the output end of the motion-transmitting member is matched with the mating area, and when the output end reciprocates longitudinally, the mating area and the brush head assembly are driven to oscillate reciprocally.