| 摘要 |
PURPOSE:To prevent a V-shaped block from breaking due to a large herz stress acting on the V-shaped block by making the end surface of each of the V-shaped block facing the side surface of a V-groove of a pulley curved so that each of the V-shaped block comes into contact with both of the side surfaces of the V-groove at one point for each of the side surfaces. CONSTITUTION:Multiple V-belts 13, 14 stretched in plural number between common V-groove pulleys 11 and 12 transmit power between the common V- groove pulleys 11 and 12 by means of frictional engagement between the V-shaped blocks, 19, 20 and the side surface 15a-18a of the V-groove of a pulley. Continuously variable speed change is possible in this case by displacing a V-groove surface of one of the V-groove pulleys 11, 12 in the axial direction thereby changing the arc radiuses of the belts 13, 14 routed over the pulley. The end surfaces 19a, 20a of the V-shaped blockes 19, 20 facing the side surfaces 15a-18a of the V-groove of the pulley are curved with a curvature radius smaller than the minimum curvature radius of the corresponding side surface of the V-groove within a plane containing the rotary axis 0 of the pulley. As a result, the end surfaces 19a, 20a of the V-shaped block come into contact with the side surfaces 15a-18a respectively only at one point.
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