| 摘要 |
980,930. Change-speed gear; positive clutches. FORD MOTOR CO. Ltd. June 1, 1962 [June 13, 1961], No. 21171/62. Headings F2C and F2D. [Also in Division B7] Change-speed gearing for a motor vehicle comprises an input shaft 14, Fig. 1, driven by the vehicle engine through the usual main clutch, coupled through a releasable spline connection 96 to a gear 86 journalled upon a driven sleeve 82 fast with an output pinion 16 surrounding the input shaft, the gear 86 meshing a gear of a countershaft cluster 104 and balk-ring synchromesh clutches 132, 162 being selectively engaged to establish first or second, and third or fourth, respectively, of four forward ratios. Reverse is established by sliding a pinion, Fig. 9 (not shown), into mesh with teeth 172 on the selector sleeve of the clutch 162 while the latter is in the neutral position shown. Each synchromesh clutch comprises an internally frusto-conically surfaced ring 128 &c. frictionally mounted upon a supporting gear hub and provided with peripheral balking teeth, axially slidable bars 133 within the associated selector sleeve 132 engaging the balk ring with its associated gear hub prior to synchronism, and during clutch engagement, teeth within the selector sleeve then engaging clutch teeth 122 on the gear hub. The gear-case 12 supports bearings 30, 32 at both sides of the output pinion and has an end cap 94 which can be taken off to allow access to a retainer 100 which, when removed, allows the input shaft 14 to be withdrawn axially through the output pinion 16 for maintenance of the main clutch. The output pinion 16 meshes a crown wheel 44, Fig. 8, of a bevel gear differential having its output shafts 76, 78 connected through universal joints to road wheels of the vehicle. The bevel planets 70 of the differential are mounted upon a shaft 72 provided with a circumferential groove engaged by a cross-pin 74 to hold the shaft within the differential housing. The selector sleeves 132, 162 and the reverse pinion are controlled through the usual forks by three shift rods 198, 218, 240, Figs. 6, 7, retained in position by spring-biased detents 270, 272, 254. Simultaneous establishment of more than one ratio is prevented by drift pins 271, 273 engaging notches 284 &c. in the shift rods in the usual way, an additional drift pin 286 passing through the shift rail 218 abutting the two drift pins 271, 273 so that when the rod 198 is slidden to one or other of its ratio established positions, the drift pin 271 is forced out of the notch 284 and all three drift pins are moved axially, the drift pin 273 engaging a notch 278 in the reverse shift rod 240 thus prevented from sliding. Conversely, when the reverse shift rod 240 is slidden to establish reverse, the drift pin 271 is forced into the notch 284 in the shift rod 198 which therefore cannot be slidden to establish first or second. |
