planet gear


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planet gear

[′plan·ət ‚gir]
(mechanical engineering)
A pinion in a planetary gear train.
References in periodicals archive ?
Since the planet gear is free to rotate, the torsional motion of the planet gear is uncoupled from the carrier motions.
In the planetary stage, the center distance incremental factor is held at zero, and thus the geometric relation of [r.sub.1] = ([r.sub.2] + 2[r.sub.5]) is valid, where [r.sub.1], [r.sub.2], and [r.sub.5] are the radii of ring, sun, and planet gears, respectively.
In particular, we focus on characteristics of gear meshing frequency components due to planet gear set driving.
Figure 3 shows one of the examined Response Surfaces for the safety factor, in respect to the planet gear diameter and the output torque.
Thus, they differ from an ordinary parallel shaft gear trains by having a moving axis or axes: sun pinion gear, planet gear, planet carrier, internal toothed ring gear--annulus, Fig.
In response Watt and William Murdock invented the sun and planet gear system, whereby one or more outer gears, or planet gears, rotate around a central or sun gear.
The drive train's planet gear carrier was all assembled steel structure to maintain gear alignment.
The entire mechanism is considered to be locked together and the whole device is rotated one turn in a clockwise position around that axis about which the planet gear pin is carried.
[6] developed a signal decomposition technique to extract the vibration signal corresponding to one tooth of a planet gear for planet gear tooth crack detection.
A zoom-in in the region between order 0 and order 6.5, as demonstrated in Figure 20, reveals the meshing frequency [f.sub.m12] of planet gear and sun gear, equally for planet gear and gear ring, and its harmonics markedly.