| 摘要 |
939,564. Change speed control. ZAHNBADFABRIK FRIEDRICHSHAFEN A.G. Sept. 14, 1962 [Sept. 14, 1961], No. 35179/62. Class 80 (2). In a step-by-step gear shift mechanism having a shift element for each ratio and a shift lever having either a finger or a toothed segment engaging a toothed segment or a finger respectively, the lever has a movement in a first direction in the plane of the segment limited to one tooth space for each ratio after movement in a second, perpendicular, direction in one sense and continuous movement in the first direction after movement in the second sense of the second direction to engage the neutral tooth gap. Pivoting movement of the gear shift lever 21 about a pivot 22 in a first sense raises the finger 25 from engagement with a toothed segment 26 having shift pins 31 of shift elements 32 projecting into the gaps in the segment. The lever may then be rotated about a pivot 23 to an extent equal to one tooth limited by a detent 27, loaded by springs 27c, engaging a corresponding toothed segment 27a, the lever then returns to the mid-position under the influence of spring detents 24 for the finger 25 to enter the adjacent tooth space of segment 26 and actuate the next shift pin and element. Movement of the lever 21 in the opposite sense about pivot 22 releases the finger 25 from the segment 26 and causes the bevel edged detent 29 to ride over a locking member 30 which prevents return of the lever detent 24 except when the detent 29 is opposite a gap in the member 30 corresponding to the neutral shift pin. In a second embodiment, the lever is restricted to movement equivalent to one ratio by a pivoted locking bolt engaging the toothed segment 26 and limited in its pivoting movement to one tooth space. In a third embodiment, Fig. 8, upward movement of the end of the lever 81 releases a roller 82 from a shift pin 107,- and engages a pin 84 with a slot in a plate 85 having an aperture 86 engaged by a fixed member 87 to limit horizontal pivoting movement to one tooth space. On release of the lever 81, the roller 82 returns to contact the adjacent shift pin under the action of spring-loaded levers 97, 98. A neutral detent 90 allows the selection of neutral from any ratio after downward movement of the lever 81 and an electromagnetic stop 105 may prohibit entry into undersirable ratios at high speed. |
