Loading patent…
AssigneeNtn Corporation
InventorsMichio Hori, Nurumu Kuwahara, Yoshifumi Yamamoto
Estimating the term…
A swing bearing assembly includes a plurality of balls (3) interposed between double row raceway grooves (1a, 1b, 2a, 2b) in inner and outer rings (1, 2). The distance (ei) between the double row raceway grooves in the inner ring or the distance (eo) between the double row raceway grooves in the outer ring is within the range of a value equal to the diameter (Dw) of each of the balls to a value 1.7 times the diameter (Dw) and the diameter (Dw) of each of the balls is within the range of 30 to 80 mm, with the difference (Δe) between the raceway groove distance (ei) and the raceway groove distance (eo) chosen to be within the range of 5 to 50 μm. The double row raceway grooves are simultaneously processed with the use of alundum series grindstones.
A swing bearing assembly, which comprises an inner ring having double row raceway grooves defined therein, an outer ring having double row raceway grooves defined therein, a plurality of balls interposed between the double row raceway grooves in the inner ring and the double row raceway grooves in the outer ring, respectively,
A method of processing double row raceway grooves in a swing bearing assembly, in which the double row raceway grooves are formed in each of inner and outer rings, which is of one-piece structure, and a plurality of balls are interposed between the double row raceway grooves in the inner ring and the double row raceway grooves in the outer ring, respectively, and in which the double row raceway grooves in the inner ring and the double row raceway grooves in the outer ring are simultaneously processed to reduce the difference between the distance from one row of the raceway groove in the inner ring to another row of the raceway groove in the inner ring and the distance from one row of the raceway groove in the outer ring to another row of the raceway groove in the outer ring to a value equal to or smaller than 50 μm.
Dependencies are inferred from the claim text.