GEAR, REDUCTION GEAR MECHANISM AND ELECTRIC POWER STEERING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method capable of retaining a lubricant between tooth flanks to reduce frictions between tooth flanks when tooth flanks are made to forcibly contact with each other and capable of reducing a rotational resistance when a gear engagement malfunctions. SOLUTION: A recess 12 is provided to hold a lubricant in a gear 11a to increase a lubricity between gears.