| 摘要 |
638,301. Controlling change-speed gearing. MAGIS, A. A. G. May 29, 1947, No. 14278. Convention ' date, April, 8, 1943. [Class 80 (ii)] In change-speed gearing having constant-mesh gear pairs brought selectively into action by dog clutches all situated on one gearing shaft, the clutches are actuated by sliding normally to the shaft a common operating member having on opposite sides of the shaft duplicate cam plates with cam grooves or slots engaged by diametrically opposed trunnions on each clutch fork. As shown, applied to a motor vehicle, an input pinion 4, Fig. 1, drives through a gear 14 a layshaft 16 carrying gears 15 meshing, directly or through a reversing idler 17, gears 6 connectible to the output shaft 2 by dog clutches 5 slidably splined thereon. Trunnions 11, Fig. 2, on the clutch forks 10 engage cam slots 12, Fig. 3, in the side plates 13 of an operating member connected by arms 18, slidable in the gear casing, to an operating bell-crank lever 20, 19 co-acting with a notched quadrant 25. Stops 27 prevent movement of the forks 10 perpendicular to the shafts. Movement of the lever arm 19 in one direction gives successive gear ratios from reverse to fourth speed or vice versa, with a neutral position between each ratio. As applied to a bicycle bottom bracket gear, pinions 31, Fig. 10, clutchable to the crank shaft 30, mesh pinions 33 rigid with a layshaft driving through further gear pairs 35, 36 a'shaft carrying the chain wheel 38. An operating member 41 controls the clutches 32 as before to give four forward speeds. Gearing according to the invention is also applicable to rolling mill trains or machine tools and, when used for the latter, two gears of the kind having parallel driving and driven shafts may be employed in series to give multiple ratios. |
