The invention discloses a manual autorotation rotary chair, and relates to the technical field of
mechanical engineering and transmission, in particular to a manual autorotation rotary chair which comprises chair legs, a central shaft, an outer gear shaft sleeve, a planetary
speed reduction gear set, a centrifugal speed increase gear set, a mechanical hydraulic automatic
speed reduction brake system, a pedal, a seat, an operation
steering wheel and the like. The footing is formed by bending a cold-rolled steel plate, the thickness of the footing is 5mm, the middle end of the footing is fixed with an outer
bushing jackscrew through a central shaft, and the footing is connected with a gray sports floor (made of PVC (
polyvinyl chloride), and anti-skid grains with the depth of 1mm are pressed on the surface); the upper end of the shell is rotatably connected with a rotary chair operation board (the
diameter is 400mm and the thickness is 25mm) through a rotary shaft; and the upper end of the gray sports floor is fixedly connected with an annular backrest through
epoxy resin glue. By arranging the separated internal tooth planetary gear set, the laminated transmission shaft and the speed limiting mechanical gear
assembly, the problems that in the background technology, the rotating speed is too high, vibration and
noise are likely to be generated, and lubricating oil loses
efficacy under the high-temperature or high-load working condition are solved.