| 摘要 |
PURPOSE:To prevent damage to ball or cage by forming an inner-ring inserting window hole to a rectangle whose coners are circular arcs and ball retaining holes to rectangles whose both sides in the direction of center line are circular arcs, together with cutting fine lubricating oil grooves on the inner and outer spherical surfaces of the cage. CONSTITUTION:An inner-ring inserting window hole 115 and ball-retaining window holes 114 are drilled out symmetrical to an axis-line 116 of a cage and to a center line 117 of maximum diameter part between both end faces 122, 123. The inner-ring inserting window hole 115 is an approximate rectangle parallel to the upper and lower faces 122, 123, the length of major side 124 is about 1.5 times that of the minor side 125, and the corner 118 is formed to a circular arc nearly 1/4 times the minor side 125. Also, the ball retaining window hole 114 is formed to an approximate rectangle whose major side 126 is equal to about 1.3 times the minor side. And over the whole of the outer and inner spherical surfaces of the cage, a number of fine lubricating oil grooves 120 of a degree of several microns depth are cut. |
