| 摘要 |
An improved transmission assembly includes a pair of variable diameter drive pulleys having effective diameters which can be changed in response to a command signal to vary the speed of rotation of an output member relative to the speed of rotation of an input member. To accomplish this, the command signal effects operation of a reversible servomotor to operate drive assemblies. One of these drive assemblies moves a section of one drive pulley toward another section of the drive pulley to increase the effective diameter of this drive pulley. Operation of the drive assemblies also moves a section of the other drive pulley away from an associated section of the pulley to decrease the effective diameter of this drive pulley. As the sections of the drive pulleys are being moved, a signal generator provides a feedback signal which varies with variations in the effective diameters of the drive pulleys. An error detector interrupts operation of the servomotor when the feedback signal is a predetermined function of the command signal. A belt stretch compensator assembly is provided to increase the effective diameters of both drive pulleys in response to an increase in the effective length of a drivebelt extending between the drive pulleys.
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