Zahnraederwechselgetriebe

摘要

1,095,435. Change-speed gear; ratchet Clutches. DIAMOND POWER SPECIALITY CORPORATION. July 28, 1965 [Sept. 18, 1964], No. 32278/65. Headings F2C and F2D. In a two-speed gear, for a reversible electric motor drive of a soot blower lance (or a machine tool carriage) drive, wherein reversal of the rotational direction of a driving shaft 12 effects a reversal of the rotational direction of a driven shaft 14 but at a different ratio, the high-speed forward (or reverse) train comprises constantmesh gears 20, 28 respectively connectible to the input shaft, through a coil spring one-way clutch 24 and a series lost-motion connection 26, 27, and keyed on the output shaft, and the low-speed reverse (or forward) train comprises constant-mesh gears 18, 33 respectively secured to or integral with the input shaft, and connectible to the output shaft through a coil spring one-way clutch 46 responsive only to the direction of rotation of the gear 33. The oneway clutch 24 comprises a coil spring dragging on hubs 25, 21 respectively connected to the input shaft, through the lost-motion connection 26, 27, and to the gear 20. The one-way clutch 46 comprises a coil spring having three portions, viz. 461, dragging on a hub 35 of the gear 33; 462, engageable with a hub 36 of the gear 28; and 463 dragging on the bore of a sleeve 40 held against rotation by a fixed pin 44. The lost-motion connection 26, 27 ensures, on reversal, release of the clutch 46 before engagement of the clutch 24 when on stoppage after reverse (or forward) drive the gear is still under load and/or the clutch 46 is held engaged by friction. The drag connection of the coil spring of the clutch 46 with the rotationally held sleeve 40 renders said clutch responsive only to the direction of rotation of the gear 33 and prevents train lock-up in forward (or reverse) drive when the gear 28 is driven faster than the gear 33.