| 摘要 |
An electromagnetic speed change apparatus is effective to shift a sleeve from a first speed position to a second against the bias of a spring. In a preferred form, the apparatus includes an armature fixed to a shifting sleeve for rotation and axial movement therewith, one end of the shifting sleeve splined to an output shaft, the opposite end of the shifting sleeve selectively engagable with an internally splined aperture positioned in one end of an input shaft or with an internally splined carrier aperture axially spaced from the input shaft end. The shifting sleeve has a minor diameter portion and a major portion larger than the minor portion. The major portion is piloted by a support member disposed in the end of the input shaft. In a preferred form, a neck bridges the major and minor diameter portions of the sleeve, and provides a limit to axial movement of the shifting sleeve whenever the neck comes into contact with the support member. Finally, in the preferred form, the biasing force of the spring is effective to cause the shifting sleeve to move to a fail-safe gear position upon failure of electromagnetic actuation. |
