Multispeed power tool transmission

  • US 6,984,188 B2
  • Filed: 03/10/2003
  • Issued: 01/10/2006
  • Est. Priority Date: 01/23/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. A portable power tool comprising:

  • a housing;

    a motor;

    a driven member; and

    a multi-stage transmission at least partially received in the housing, the multi-stage transmission receiving torque from the motor and outputting torque to the driven member, the multi-stage transmission having a first gear set, a second gear set and a third gear set, the first gear set including a planet carrier and a plurality of planet gears, the planet carrier rotatably supporting the plurality of planet gears, the second gear set including a ring gear that is not in meshing engagement with the planet gears of the first gear set, the third gear set having a ring gear;

    wherein the multi-stage transmission is operable in at least three overall gear ratios, wherein the ring gear of the third gear set may be selectively non-rotatably coupled to the housing to inhibit relative rotation therebetween, wherein the ring gear of the second gear set may be selectively non-rotatably coupled to the housing to inhibit relative rotation therebetween, and wherein the ring gear of the second gear set may be selectively coupled to the planet carrier of the first gear set for rotation therewith.

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