| 摘要 |
<p>The invention is applicable to a continuously variable transmission of the type comprising two pulleys of variable effective diameter connected by a drive belt. Each pulley comprises an outer pair of discs (20, 21) rigidly connected together and axially spaced from one another and a pair of inner discs (23, 24) rigidly connected to one another, and spaced from one another by a distance less than the outer pair so as to lie between the outer pair of discs. The inner discs have circumferentially spaced spiral guideways and the outer discs have similar spiral guideways but extending in the opposite sense so that as the pulley is viewed axially the guideways of the inner discs appear to intersect the outer discs. When the inner discs are moved angularly relative to the outer discs, the distance of the intersections from the axis of the pulley varies, and belt drive elements (31) disposed about the pulley having end portions engaged in the spiral guideways of the discs, are caused to move radially inwardly or outwardly to change the effectife pulley diameter. In such a transmission, the invention provides that each guideway (29) in a disc has at its outermost end a circumferentially extending portion (30), which has the effect of relieving stresses at the outer circumference of the disc and eliminating a potential source of failure.</p> |
