Planetary gear drive
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United States of America Patent
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Feb 20, 2018
Issued Date -
N/A
app pub date -
May 27, 2016
filing date -
Sep 10, 2015
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Abstract
A planetary gear drive has needle roller bearings of full roller type as planetary gear bearings for planetary gears. The needle roller bearings have lubrication mechanisms, respectively. Each lubrication mechanism has an annular grease retaining groove. The grease retaining groove is formed on an inner peripheral surface (an outer-race-side raceway surface) of the shaft hole of each planetary gear. Poor lubrication can be prevented from occurring when needle roller bearings of full roller type are employed as the planetary gear bearings.
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