PROBLEM TO BE SOLVED: To provide a steering angle ratio variable device comprising: a speed reducing (speed increasing) device including an inscribed planetary gear mechanism and a constant velocity internal gear mechanism; and a hollow auxiliary shaft, with improved torque transmission efficiency owing to the constant velocity internal gear mechanism.SOLUTION: A hollow auxiliary shaft 5 comprises: a main body 51 coaxially, externally and rotatably inserted into a first shaft 2; and an eccentric part 52 formed at one end in an axial direction of the body part, and arranged eccentrically with respect to a center of the body part. A rotor 41 of an electric motor 4 is coaxially and externally inserted the body part 51. A constant velocity internal gear mechanism 6 comprises: pin holes 33 formed between an external tooth gear 32 of an inscribed planetary gear mechanism 3 and one end in the axial direction of the first shaft 2, and pins 21 inserted into the pin holes 33. An internal tooth gear 31 of inscribed planetary gear mechanism is integrally and rotatably arranged with a second shaft 1. The external tooth gear 32 is rotatably installed in the eccentric part 52 via a rolling bearing 55. The inscribed planetary gear mechanism 3, the rolling bearing 55 and the constant velocity internal gear mechanism 6 are arranged in a position where they overlap with each other in the axial direction.SELECTED DRAWING: Figure 1
【課題】内接式遊星歯車機構および等速度内歯車機構からなる減速(増速)機と中空の補助軸とを備えた舵角比可変装置の、等速度内歯車機構によるトルク伝達効率を向上させる。【解決手段】中空の補助軸5は、第一軸2に対して同軸に回転自在に外挿された本体部51と、本体部の軸方向一端に形成され本体部の回転中心から偏芯した偏芯部52と、を有する。電動モータ4のロータ41が本体部51に同軸に外嵌され、等速度内歯車機構6は、内接式遊星歯車機構3の外歯歯車32と第一軸2の軸方向一端との間に形成された、ピン穴33とピン穴33に入るピン21とからなる。内接式遊星歯車機構の内歯歯車31が第二軸1と一体に回転可能に配置され、外歯歯車32が偏芯部52に転がり軸受55を介して回転自在に設置され、内接式遊星歯車機構3と転がり軸受55と等速度内歯車機構6とが、軸の径方向で重なる位置に配置されている。【選択図】図1
STEERING ANGLE RATIO VARIABLE DEVICE
舵角比可変装置
2018-06-21
Patent
Electronic Resource
Japanese