The PSR (Pancake Speed Reducer) is a sophisticatedly designed pancake type ultrathin differential speed reducer. Two high-reliability trochoid gears are placed oppositely inside a roller placed on the circumference to form a robust, elaborate ultrathin reducer. Power is outputted by means of an artful pin-and-hole mechanism and a cross-roller bearing support.
Non-backlash reduction unit, Circular arc Cam Ring Unit (RGU) can be used in any size and angle, space-saving, simplification of layout and cost down. It can be used in larger diameters and hollows than full rings by connecting circular arc rings.