Multispeed power tool transmission
DCFirst Claim
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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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Abstract
A multi-speed transmission assembly for a rotary power tool. The transmission assembly includes a plurality of transmission stages, with at least two of the transmission stages employing a movable reduction element that permits the transmission stage to be operated in an active mode and an inactive mode. The movable reduction elements are coupled to a switching mechanism that switches the reduction elements in a predetermined manner to provide at least three-gear reduction or speed ratios.
177 Citations
30 Claims
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1. A portable power tool comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A portable power tool, comprising:
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a housing; a motor having a motor output member; a driven member; a transmission in the housing, the transmission being configured to receive a rotary input from the motor output member and to produce a rotary output that is transmitted to the driven member, the transmission having a plurality of planetary transmission stages, wherein a member of the transmission may be axially positioned between a first condition, in which at least one of the planetary transmission stages is operable in an active mode, and a second condition, in which at least one of the planetary transmission stages is operable in an inactive mode, and wherein the transmission is operable in at least three overall speed reduction ratios, at least three planetary pear reductions transmitting torque between the motor output member and the driven member in each of the at least three overall speed reduction ratios; and a speed selector having a switch and an actuator, the switch being coupled to the housing, a portion of the switch forming a portion of an exterior surface of the portable power tool so as to be manipulate-able by a user of the portable power tool, the actuator engaging the member of the transmission and moving the member of the transmission in a predetermined manner in response to movement of the switch. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A power tool comprising a housing, a motor for driving an output spindle through a multi-speed transmission, and a speed selector, the transmission providing at least three planetary gear reductions between the motor and the output spindle and being selectively operated in at least three speed ratios, each planetary gear reduction including a ring gear, at least two of the ring gears being axially translatable between a first position and a second position, the speed selector engaging the transmission to selectively provide at least three of the following operating conditions:
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a first one of the ring gears is maintained in the first position and a second one of the ring gears is maintained in the first position; the first one of the ring gears is maintained in the first position and the second one of the ring gears is maintained in the second position; the first one of the ring gears is maintained in the second position and the second one of the ring gears is maintained in the first position; and the first one of the ring gears is maintained in the second position and the second one of the ring gears is maintained in the second position. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification