| 摘要 |
A belt drive unit for transmitting drive between the drive shaft on an engine and associated accessories is described, the said unit essentially comprising a pin, designed to fit on to one end of the said shaft, and a pair of pulleys having different diameters and turning round the said pin, a first smaller-diameter pulley being mounted on the said pin with a free-turning wheel inbetween, and the second pulley being mounted on the said pin with an electromagnetic coupling inbetween; the said pulley is provided with a first tubular element formed in one piece with the pulley itself and having a pair of races for two rings of ball bearings and a seat for the said free-turning wheel, provision being made for two rings of ball bearings designed to sustain rotation of the said tubular element in relation to the said pin. |
