| 摘要 |
A steplessly variable ball gear has two co-axial rings of balls (A and B), which are so supported by two inner and two outer rolling paths (19-22) formed on moulding rings (12-15) that each ball in one ring touches two rolling paths and two balls in the other ring. The inner and outer rings are axially shiftable with respect to each other. As the distance between both the inner and the outer rings is constant and the rolling paths have concave-curved, preferably circular arc-shaped cross-sections, it can be ensured that the contacts of tangency, required for transmission of torque, between the balls and between the balls and the rolling paths are maintained over a wide variation range. |
