| 摘要 |
751,899. Operating change-speed gearing. ZAHNRADFABRIK FRIEDRICHSHAFEN AKT.-GES. May 27, 1954 [June 12, 1953], No. 15708/54. Class 80(2) A change-speed gear has three parallel selector rods 13, 14, 15 provided with five recesses formed between five pairs of projections 35 for engagement by three axially-spaced projections 5, 6, 7 from a transverse sleeve 1 which is slid axially to mesh the latter projections with the recesses and is then turned to slide the selected rod to engage the desired gear, the projections 5. 6, 7 being offset from the vertical so that each serves to move a selector rod in only one direction from neutral position. The sleeve 1 may be operated directly by a ball-mounted gear lever 38, or indirectly through linkage by a column shifter. Rod 13 has one pair of projections 35, while each of rods 14, 15 has two pairs. In the central neutral position shown, projection 5 is engaged between one pair of projections 35 on rod 15 and projection 6 is engaged between one pair of projections 35 on rod 14, so that by turning sleeve 1 in one direction or the other rod 15 may be moved to the right (Fig. 2) to engage first gear or rod 14 may be moved to the left to engage second gear. By sliding sleeve 1 downwards (Fig. 2) from neutral, projection 6 engages between the other pair of projections 35 on rod 15 and projections 7 engage between the other pair of projections 35 on rod 14, so that by turning sleeve 1 in one direction or the other rod 14 may be moved to the right to engage third speed or rod 15 may be moved to the left to engage fourth speed. Similarly. by sliding sleeve 1 upwards from neutral, projection 7 engages between the pair of projections 35 on rod 13 and sleeve 1 may then be turned to move rod 13 tc the right to engage reverse. The operative edges 20 of the projections 5, 6, 7 are rounded so that the effective leverage is smaller at the beginning of the engaging movement of the rods 13, 14, 15. The sleeve 1 has a slot 33 co-operating with a fixed plate 30 formed with three recesses 31 such as to prevent incorrect sliding or turning of the sleeve |
