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US 4,369,674 AGranted
Power transmission device
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsMasumi Hamane, Makoto Kondo
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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsMasumi Hamane, Makoto Kondo
Estimating the term…
A light, miniaturized power transmission device of the type wherein the power from a drive shaft is transmitted to a driven shaft via a planetary gear mechanism. The planetary gear mechanism has a ring gear, a sun gear disposed concentrically on the radially inner side of the ring gear, and planetary gears disposed between and engaged with the sun gear and the ring gear. At least the meshing portions of the planetary gears, ring gear and sun gear are resiliently held from opposite side surfaces thereof by a pair of side plates attached to said planetary gear mechanism. The side plates permit free orbital movements of the planetary gears and suppresses the relative axial movements of the ring gear, planetary gears and sun gear. A centrifugally operated friction clutch is disposed between the drive shaft and the planetary gear mechanism so as to control the transmission of power from the drive shaft to the planetary gear mechanism. The clutch comprises an annular outer contactor integrally formed with the ring gear, and inner contactors which are connected to the drive shaft for rotation therewith and adapted to be placed under a centrifugal force into frictional contact with the annular outer contactor to thereby transmit the rotation of the drive shaft to the ring gear when the number of revolutions of the drive shaft exceeds a predetermined level.
In a power transmission device for transmitting power from a drive shaft to a driven shaft by way of a planetary gear mechanism, said planetary gear mechanism having a ring gear, a sun gear disposed concentrically on the radially inner side of said ring gear, and planetary gears disposed between and engaged with said sun gear and said ring gear, the improvement comprising a pair of side plate means attached to said planetary gear mechanism for holding the meshing portions of said planetary gears, said ring gear and said sun gear from the opposite sides of the gears so as to permit free sliding movement of all of these gears relative thereto and, at the same time, acting to suppress relative axial movements of all of these gears, said side plate means serving to support at least one of said ring gear, said planetary gears and said sun gear, said side plate means being in sliding contact with only opposite side surfaces of all of the respective gears.
Dependencies are inferred from the claim text.