Patent ID: 7694601

Claim:
A gear device comprising: a plurality of gears which mesh with each other; a housing for housing the plurality of gears, the housing including a plurality of extended projections and an annular inner diameter portion; and a lubricant housed in the housing, wherein an extended projection is provided on at least one side surface of at least one gear selected from the plurality of gears, the extended projections of the housing are provided on a side surface of the housing facing the at least one side surface of the selected gear, and extend tangentially outward from the annular inner diameter portion, the extended projection of the selected gear and the extended projections of the housing extend in a direction crossing the circumferential direction of the selected gear, and when viewed along an axial direction of the selected gear, the extended projection of the selected gear and the extended projections of the housing partially face each other in the axial direction of the selected gear and form facing portions to form a lubricant holding portion capable of holding the lubricant between the facing portion of the extended projection of the selected gear and the facing portion of the extended projections of the housing to move the lubricant held in the lubricant holding portion to a gear mesh portion of the selected gear according to rotation of the selected gear.