| 摘要 |
An axial actuator or torque-responsive contact-pressure control, especially for variable-speed drives having a sheave with at least one axially movable disk for varying the pitch diameter of a transmission system having a flexible member interconnecting the adjustable sheave with a further sheave, e.g., a belt or chain transmission. The actuator or torque-responsive control, which has a relatively small mass and substantially no play, comprises a radial pressure pin shiftable along the axis of the adjustable sheave and/or angularly displaceable relative thereto and within a body defining a surface of revolution with an axis lying along a radius. A pair of pressure shoes have surfaces of a radius of curvature corresponding to that of the surface of revolution and planar flanks tangential to the pressure pin, while being received between the latter and the soffit of the surface of revolution so that the angle of attack of the pressure pin on the pressure shoes is varied in accordance with the position of the movable sheave disk. A force-transmitting system between the latter disk and the pressure shoes defines the ratio of pressure-pin movement to disk movement.
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