Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive
Patent
1989-10-16
1991-05-28
Herrmann, Allan D.
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
74421A, 192114T, F16H 308, F16H 3083
Patent
active
050190237
ABSTRACT:
An electrically powered tool such as a drill has a gear holder drivable by a motor shaft and having a larger-diameter gear and a smaller-diameter gear, a transmission shaft rotatable by the gear holder for rotating an output shaft, the transmission shaft having a splined disc having first splines, a high-speed gear rotatably mounted on the transmission shaft and held in mesh with the larger-diameter gear, the high-speed gear having second splines, a low-speed gear rotatably mounted on the transmission shaft and held in mesh with the smaller-diameter gear, the low-speed gear having third splines, a pair of springs for normally urging the high- and low-speed gears to be axially held against opposite surfaces of the splined disc, and a clutch plate having internal axial teeth and axially slidably mounted on the splined disc. The clutch plate is axially movable in a position in which the internal axial teeth mesh with the first and second splines and a position in which the internal axial teeth mesh with the first and third splines.
REFERENCES:
patent: 3219164 (1965-11-01), Henyon
patent: 3430521 (1969-03-01), Kulman
patent: 3871786 (1975-03-01), Rennerfelt
patent: 3918560 (1975-11-01), Zach, Jr.
patent: 4493223 (1985-01-01), Kishi et al.
patent: 4619162 (1986-10-01), Van Laere
Herrmann Allan D.
Hitachi Koki Company Limited
Ta Khoi Q.
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