| 摘要 |
1,200,044. Change-speed gear. FORD MOTOR CO. Ltd. 12 Feb., 1969 [29 April, 1968], No. 7568/69. Heading F2D. Six forward and two reverse ratios of a synchromesh-clutched countershaft gear, comprising a direct-reduced auxiliary gear 26 arranged in series behind a main three-speeds and reverse gear 14, are selected by a single ballmounted manual shift-lever 152 which moves in two identical but axially spaced four-position H-patterns, Fig. 7, according as to whether low-range (reduced) or high-range (direct) is selected in the auxiliary gear. For this purpose the three shift-rails 130, 128, 132, Fig. 3, which select respectively low and reverse; second and high, in the main gear; and low and high range in the auxiliary gear each have two axiallyspaced lugs 170, 172; 166, 168 and 174, 176 respectively and the depending operative end of the manual shift lever 152, Fig. 1, is forked into spaced fingers 162, 164, which straddle one or other pairs of the lugs 170, 166 or 172, 168 of the main-gear shift-rails 130, 128, according as to whether the same manual lever 152 has previously selected low or high range in the auxiliary gear. Fig. 3 shows the shift rails 130, 128 positioned for neutral in the main gear, and the sail 132 set for low-range in the auxiliary gear, which latter has no neutral setting, all the shift-lug pairs being in axial alignment and the depending finger 162 of the shift-lever 152 being free to move transversely in the notches between the lug-pairs 166, 168 &c. In the main gear three speeds (two reduced and direct) and one reverse can now be selected in the usual H-pattern, Fig. 7, left, with the shift-lever fork 162, 164 effectively straddling the shift-rail lugs 170, 166. To change range the shift lever 152 is moved through neutral; transversely to engage the lug 174 of the auxiliary gear shift-rail 132; and backwards to slide the rail 132 forwards (dotted position) to upshift the auxiliary gear to high range (direct-drive), whereupon the same H-pattern, for ratios four, five, six and second reverse, can be repeated axially spaced from the proceeding low-range pattern, with the forked end 162, 164 of the shift-lever operating on the rail-lugs 172, 168 and the fork finger 164 occupying the spaces between the lug-pairs. The shift-rails have drift-pin interlocks 194, 200 and positioning spring-detents, two horizontal 184, 135 and one (Fig. 2, not shown) vertical. |
