Patent ID: 9249862
Filing Date: 2016-02-02
CPC Classification: F16H

Claim Text:
1. A differential Bevel gear speed reducer consisting of first gears that are not profile shifted gears, each of the first gears having a same tooth form and a same gear module value, wherein: three pinion Bevel gears among the first gears that are located between an input Bevel gear and an output Bevel gear, wherein the three pinion Bevel gears are structured such that distances between each of the three pinion Bevel gears are equal, and each respective rotational axis of the three pinion Bevel gears forms an equal angle with another rotational axis of any other of the three pinion Bevel gears, and the respective rotational axes of the three pinion Bevel gears meet at a center about which the three respective rotational axes of the three pinion Bevel gears rotate, first teeth of each of the three pinion Bevel gears mesh with second teeth of the input Bevel gear and third teeth of the output Bevel gear under the following condition: the rotational axes of the three pinion Bevel gears are configured to meet an rotational axis of the input Bevel gear and an rotational axis of the output Bevel gear at an oblique angle, revolution-inducing Bevel gears among the first gears that have a same number of teeth, a same module value, and a same cone apex as the three pinion Bevel gears are fixedly placed at an outer side of said rotational axes of the three pinion Bevel gears, an orbit Bevel gear among the first gears that is engaged with the revolution-inducing Bevel gears is fixedly placed inside of a housing, causing the three pinion Bevel gears and the revolution-inducing Bevel gear to revolve along an orbit of the orbit Bevel gear as the input Bevel gear revolves, and the rotation of the input Bevel gear causes differential rotation of the output Bevel gear such that the output Bevel gear is rotated according to a difference between a number of teeth of the input Bevel gear and a number of teeth of the output Bevel gear per one rotation of the input Bevel gear according to a speed reduction ratio expressed as follows: speed reduction ratio=(D