| 摘要 |
PCT No. PCT/FR83/00024 Sec. 371 Date May 14, 1984 Sec. 102(e) Date May 14, 1984 PCT Filed Feb. 4, 1983 PCT Pub. No. WO83/02985 PCT Pub. Date Sep. 1, 1983.A transmission with free-wheel capability comprises a bolt slidingly mounted in a bell-housing integral with a driving shaft, adapted for engagement in a cage provided with rollers and mounted in the bell-housing for movement between two positions in which the rollers and the bell-housing are in abutment so that a driving and a driven shaft are coupled to rotate together. The bolt maintains the cage in a middle position in which the driven shaft is disengaged and allowed to free-wheel, when the transmission is in forward travel and not in any braking condition. An electromagnet draws the bolt into the cage. This device ensures the free-wheel setting of the vehicle in forward travel up to a predetermined speed. At higher speeds a safety system automatically couples the driving and driven shafts together again. |
