# sun gear

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Related to sun gear: planetary gear

## sun gear

[′sən ‚gir]
(mechanical engineering)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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where i=1...3, [[omega].sub.P] is the pinion speed, [[omega].sub.C] is the carrier speed, and [[omega].sub.Si] is the [i.sub.th] sun gear speed, and [z.sub.pi] and [z.sub.Si] are teeth counts for the [i.sub.th] pinion and sun gear.
In the structure of the power-split hybrid electric vehicle, a smaller motor is attached to the sun gear of the planetary gear set.
To determine the efficiency, let's consider the scheme of the forces acting in the clutches of the sun gear and satellite ([[bar.F].sub.12]), of the satellite and the epicycle ([[bar.F].sub.23]), of the satellite and the carrier ([[bar.F].sub.24]) and write the equilibrium condition of the satellite (fig.
Ignoring the inertia moments of all planet and sun gears, the gap and mesh elasticity between each gear pair, and the equivalent friction damping loss of each shaft, the kinetic and kinematic expressions for each shaft are given by [13]:
As shown in Figure 8, the angular velocity of the carrier body is 14.2 [rpm] and the angular velocity of the sun gear is 85.2 [rpm] with speed ratio of 6.
Corner marks of s, p, c, r, i (i = 1,2), j (j = 1,2, ..., n, n = 3 when i = 3 and n = 4 when i = 2) represent sun gear, planet gear, carrier, ring, stage number of planetary set, and planet gear number, respectively.
The sun gear (MG2) and the ring gear (MG1 and engine) are coupled and transfer torque to the planetary gear ultimately.
It has four basic components: ring gear, sun gear, planet gears, and a carrier that, connects the planet gears.
The relationship between rotational speed of sun gear and that of planetary carrier and inner ring of first-stage planetary gear train is shown in
The sun gear in the planetary gear is directly connected to the output shaft of motor B; ring gear c can be directly connected to the output shaft of motor A by rolling gear e or to the sun gear a through clutch C1; planet carrier d is connected to the axle through the universal transmission device to export power; the movable part of brake B1 is connected to the box body, while its fixed part is connected to the output shaft of motor A, and this part enables ring gear c to roll through brake B1; the movable part of brake B2 is connected to the box body, and the fixed part is connected to the output shaft of motor B, and this part enables sun gear a to roll through brake B2.
The products' design also features single piece carrier plates with integral gear posts and sun gear that can be arranged as needed to achieve the desired reduction ratio, and a 416 stainless steel output shaft as well as a sintered metal output bearing to protect against corrosion.

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