| 摘要 |
A pulley on an output shaft of an engine is coupled via a belt to a drive pulley which is mechanically coupled to the drive wheels of a vehicle. The tension of the belt is controllable by forward movement of a control lever from a neutral position; the control lever being arranged to shift the drive pulley relative to the output shaft pulley. The controlled variations in the tension of the belt caused by movement of the control lever produces a controlled degree of mechanical coupling between the output shaft pulley and the drive pulley to control the forward speed of the vehicle. A friction surface, provided on a circumferential periphery of the drive pulley, is capable, upon reverse movement of the control lever from the neutral position, of directly engaging with the output shaft pulley to cause reverse movement of the vehicle. A pair of belt relief straps are provided for cooperating with the belt when the control lever is in the reverse operation mode to ensure disengagement of the belt coupling between the output shaft pulley and the drive pulley. A safety device for placing and keeping the drive pulley in a neutral position when an operator disembarks from the vehicle is also provided.
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