US 6,655,470 B1Granted

Speed changing mechanism for tools

AssigneePower Network Industry Co., Ltd.

InventorTing-Kuang Chen

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Abstract

A speed changing mechanism includes two planetary gear sets and a movable gear that is controlled to be movably engaged with one of the two planetary gear sets to generate two different speeds. A third speed can be output when the movable gear is moved to a position where the movable gear is not engaged with either of the two planetary gear sets.

Claims2

Dependent claims

A speed changing mechanism comprising:

a base (1) having a receiving chamber (11) and a plurality of first protrusions (14) extending from an inner periphery of the chamber (11);
a first planetary gear set including a first disk (6) which has a plurality of first planet gears (62) rotatably connected to a first side of the first disk (6), an output shaft (61) extending from a second side of the first disk (6);
a second planetary gear set including a second disk (5) having first outer teeth (51) and a plurality of second planet gears (52) rotatably connected to a first side of the second disk (5), first inner teeth (55) defined in a second side of the second disk (5);
a ring-shaped inner gear (4) having second inner teeth (41) and second outer teeth (42);
a ring-shaped movable gear (3) having third inner teeth (31) and a plurality of bosses (32) extending from two respective edges of the movable gear (3), a groove (33) defined in an outer periphery of the movable gear (3) and an engaging member (34) engaged with the groove (33), a push button (7) connected to the engaging member (34);
a third planetary gear set including a third disk (20) which has a plurality of third planet gears (202) rotatably connected to a first side of the third disk (20), an input shaft (21) extending from a second side of the third disk (20) and the first planet gears (62) and the second planet gears (52) respectively engaged with the input shaft (21);
a ring member (22) having fourth inner teeth (221) and second protrusions (23) extending from an outer periphery of the ring member (22), the third planet gears (202) engaged with the fourth inner teeth (221) of the ring member (22);
and
the first planet gears (62) engaged with the first inner teeth (55) of the second disk (5) and the second planet gears (52) engaged with the second inner teeth (41) of the inner gear (4), the movable gear (3) movably engaged with the first outer teeth (51) of the second disk (5) or the second outer teeth (42) of the inner gear (4), the bosses (32) movably engaged with the first protrusions (14) in the base (1) or the second protrusions (23) of the ring member (22).

6 more elements

Dependencies are inferred from the claim text.

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Abstract

A speed changing mechanism comprising:

a base (1) having a receiving chamber (11) and a plurality of first protrusions (14) extending from an inner periphery of the chamber (11);
a first planetary gear set including a first disk (6) which has a plurality of first planet gears (62) rotatably connected to a first side of the first disk (6), an output shaft (61) extending from a second side of the first disk (6);
a second planetary gear set including a second disk (5) having first outer teeth (51) and a plurality of second planet gears (52) rotatably connected to a first side of the second disk (5), first inner teeth (55) defined in a second side of the second disk (5);
a ring-shaped inner gear (4) having second inner teeth (41) and second outer teeth (42);
a ring-shaped movable gear (3) having third inner teeth (31) and a plurality of bosses (32) extending from two respective edges of the movable gear (3), a groove (33) defined in an outer periphery of the movable gear (3) and an engaging member (34) engaged with the groove (33), a push button (7) connected to the engaging member (34);
a third planetary gear set including a third disk (20) which has a plurality of third planet gears (202) rotatably connected to a first side of the third disk (20), an input shaft (21) extending from a second side of the third disk (20) and the first planet gears (62) and the second planet gears (52) respectively engaged with the input shaft (21);
a ring member (22) having fourth inner teeth (221) and second protrusions (23) extending from an outer periphery of the ring member (22), the third planet gears (202) engaged with the fourth inner teeth (221) of the ring member (22);
and
the first planet gears (62) engaged with the first inner teeth (55) of the second disk (5) and the second planet gears (52) engaged with the second inner teeth (41) of the inner gear (4), the movable gear (3) movably engaged with the first outer teeth (51) of the second disk (5) or the second outer teeth (42) of the inner gear (4), the bosses (32) movably engaged with the first protrusions (14) in the base (1) or the second protrusions (23) of the ring member (22).

6 more elements