| 摘要 |
A tool having a housing assembly, which defines a handle, a motor assembly, a trigger assembly, a spindle and a transmission assembly. The motor assembly is received in the housing assembly and has an output shaft. The trigger assembly is coupled to the housing assembly and is configured for use in actuating the motor assembly. The transmission assembly transmits rotary power between the output shaft of the motor assembly and the spindle. The transmission assembly includes a planetary stage with an input sun gear, an output planet carrier and a compound planet gear having a first planet gear and a second planet gear coupled together for common rotation on the output planet carrier. The planetary stage is selectively operable in a first gear reduction and a second, relatively lower gear reduction in which the compound planet gear cooperates to produce at least one intermediate gear reduction within the planetary stage. |
| 主权项 |
1. A power tool comprising:
a housing; a motor received in the housing; an output spindle; and a transmission transmitting rotary power from the motor to the output spindle, the transmission comprising a planetary gearset having an input sun gear rotationally driven by the motor, at least one ring gear, an output planet carrier, and a first stage planet gear, a second stage planet gear, and a third stage planet gear each mounted for rotation on the planet carrier, wherein the planetary gearset is operable in a first mode in which the planetary gearset provides a first overall gear reduction from the input sun gear to the output planet carrier, and in a second mode in which the planetary gearset provides a second, lower overall gear reduction ratio from the input sun gear to the output planet carrier with the planet gears providing at least one intermediate gear reduction ratio within the planetary gearset. |
