Multispeed power tool transmission

F - Mech Eng,Light,Heat,Weapons – 16 – H

Patent

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Details

F16H 3/74 (2006.01)

Patent

CA 2558072

A portable power tool (10) with a housing (12), a motor (14) having a motor output member (44), a driven member (46) and a transmission (16). The transmission (16), which is located in the housing (12), is configured to receive a rotary input from the motor output member (44) and to produce a rotary output that is transmitted to the output spindle (20). The transmission has a plurality of planetary transmission stages (302, 304, 306), each of which including a ring gear (310, 360, 400), a planet carrier (314, 364, 404) and a plurality of planet gears (312, 362, 402) that are supported by the planet carrier for meshing engagement with the ring gear. The transmission further includes at least one member that may be configured in a first condition, which renders at least one of the planetary transmission stages operable in an active mode, and a second condition, which renders at least one of the planetary transmission stages operable in an inactive mode. The transmission is operable in at least three overall speed reduction ratios.

Cette invention concerne un outil électrique portable (10) comprenant un capot (12), un moteur (14) avec un élément de sortie (44), un élément mené (46) et un entraînement (16). L'entraînement (16), qui est logé dans le capot (12), est conçu pour être entraîné en rotation par l'élément de sortie du moteur (44) et pour produire un mouvement de rotation qui est transmis à la fusée de sortie (20) (20). L'entraînement présente une pluralité de trains planétaires (302, 304, 306), comprenant chacun une couronne (310, 360, 400), un planétaire (314, 364, 404) et une pluralité de satellites (312, 362, 402) portés par un porte-satellites et engrenant sur la couronne. L'entraînement comprend par ailleurs au moins un élément correspondant à au moins un état dans lequel au moins un des trains planétaires est utilisable en mode actif, et à un second état dans lequel au moins un des trains planétaires est utilisable en mode inactif. L'entraînement procure au moins trois rapports de réduction globale de vitesse.

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