| 摘要 |
PROBLEM TO BE SOLVED: To lubricate crank bearings.SOLUTION: An eccentric oscillation type gear device 1 includes: a crank shaft 10 having an eccentric part 10a formed; crank bearings 12a, 12b which support the crank shaft 10 rotatably; a swing gear 14 which has an insertion hole 14c into which the eccentric part 10a is inserted and has external teeth 14a; an external cylinder 2 which has an internal tooth pin 3 engaging the external teeth 14a of the swing gear 14; and a carrier 4 which is fitted with the crank shafts 12a, 12b, and generates a relative rotational frequency difference with the external cylinder 2 through swinging of the swing gear 14 accompanying rotation of the eccentric part 10a. The carrier 4 includes fitting parts 4e, 7b for fitting the crank bearings 12a, 12b and an oil groove 25 which extends along peripheral edges of the fitting parts 4e, 7b on a surface opposed to the swing gear 14, and can reserve oil. |
