In a cycloidal reducer

pin wheels are composed by precision components such as the pin wheel housing

a gear pin and outer casing. After exploring to the linear of a cycloid curve

the regular pattern of the normal movement is found

and a derivation of the cycloid normal mechanism is designed. Thus

various types of cycloid and its isometric curve are able to be created or processed

only by using a general cylindrical milling cutter and a grinding wheel to feed and cut the normal lead screw. Therefore

it is possible to manufacture the internal and external gear with a simple rolling mesh. Subsequently

a pinwheel which was formed by a number of components ranging from tens to hundreds could be replaced by a single internal gear. Moreover

a cycloidal reductor without pinwheels can be produced

which will result in a remarkable improvement of the efficiency of the reducer. The maximum reduction ratio of a single lever can be increased from 87 to more than 200.