Reduced Planetary Gear Trains

A Flywheel-Based Regenerative Braking System for Railway Vehicles

“…If the flywheels accelerate to a certain borderline degree, the clutch is disconnected, and the flywheels rotate at a high speed in the vacuum chamber. According to the analytical method of Willis [18], if the angular velocities of the two input shafts of the planetary gearset are known, the angular velocity of the output shaft can be determined by the following equation:…”

The Influence of Planet Position on Axle Loads in Double Planet Planetary Gear Trains

“…The inner planet meshes with the sun gear, the outer planet meshes with the ring gear, and the pair of planet gears mesh. A common abbreviation used for this kind of gear system is 2k-H positive [1,2], 2k-H type D [3] or AAI [4] gear train. A comparison between the double planet planetary gear train and the most widely recognisable planetary gear trains, the 2k-H, AI can be seen in Figure 1.…”

“…Most notably, the direction of rotation of the ring gear is reversed compared to the single row 2k-H and the direction of rotation of the carrier Figure 2. This makes the internal gear ratio i 0 positive-the carrier and the ring gear rotate in the same direction, which explains why this gear type is referred to as a positive planetary gear train [1,2,4]. Another notable difference between the two arrangements is the torque distribution.…”

“…This can also be expressed using the modified Wolf symbol [4]. The double line represents the summation shaft in Figure 3.…”

Torque method investigation of wolfrom gear trains

“…There are many types of simple PGTs but the train with one external and one internal meshing, and onerim planets has become established due to its indisputable advantages (Figure1a). This PGT is known as 2K-H according to Kudryavtsev's classification [3] in many countries. According to the more comprehensive and more clear classification by Tkachenko [4], the designation AI is used in this paper for such PGTs.…”