| 摘要 |
972,777. Change-speed control. FORD MOTOR CO. Ltd. Aug. 30, 1963 [Sept. 11, 1962], No. 34609/62. Heading F2D. A vehicle change-speed gear providing four forward and one reverse ratio has shift forks 13, 15, 18 ; forks 13,15 being axially slidable on a rod 9 to engage first and second, third and fourth ratios respectively, and fork 18 being fast with a rod 17 axially slidable in a housing 1 and controlling reverse. The forks are connected by levers 3, 5, 7 to rotatable rods which are connected in a conventional manner to the levers at the lower end of a steering column gear shift. On rotating lever 7 clockwise, the fork 18 shifts a reverse idler into mesh with gear teeth on the exterior of the first gear synchromesh assembly (none of which is shown) to give reverse, in which position levers 3, 5 are locked in their neutral positions by drift pins 31 engaging recesses 41 in these levers. On rotating lever 7 anticlockwise, immediately the idler disengages the gear teeth of the synchromesh assembly, and before rod 17 is in its extreme right hand " neutral " position, grooves 35 release the drift pins 31 from the recesses 41, and if lever 3 is now rotated clockwise to engage first gear an abutment 43 on the lever 3 engages an abutment 45 on the reverse lever 7, and moves the rod 17 to its neutral position as first gear is being engaged. This prevents the possibility of the first gear synchromesh assembly meshing the reverse idler and so preventing the engagement of first gear. Levers 3, 5 are interlocked by a drift sleeve 18a in which are mounted pressedapart balls 20 engaging recesses 21, 23 in the levers. |
