Patent GB-719470-A (GB)
Title: Hydro-mechanical reversing gear in particular for winding gear drive
IPC: F16H3/00
Filed: 1951-11-27
Abstract: 719,470. Reverse gear. VOITH GES., J. M. Nov. 27, 1951 [Dec. 27, 1950], No. 27829/51. Class 80 (2) [Also in Group XXIX] Two fluid couplings, one for forward and the other for reverse drive, each have an emptying scoop-tube in adjustable position in a rotating scoop-tube chamber located adjacent to and having the same diameter as the actual working space, and forming with the working chamber a common chamber such that the adjustable radial position of the inlet opening of the scooptube directly determines the degree of filling of the scoop-tube chamber and at the same time that of the fluid coupling. The driving shaft 1, Fig. 1, drives a counter shaft 3 to which are secured impellers 4 and 5 of fluid couplings I and II. Turbine 6 drives output shaft 9 and turbine 10 the same shaft reversely through an intermediate wheel 12. To prevent over-running of the output or driven shaft in winding gear to which the mechanism is particularly applicable a synchronous dog-clutch 13 is arranged between the counter shaft 3, Fig. 2, and the hollow turbine shaft 7: The clutch comprises a quick-threaded sleeve 15 having teeth 17 adapted to engage teeth 21 on the turbine 7. A similar clutch 14 is arranged between the counter shaft 3 and the hollow turbine shaft 11. Each coupling has a scoop chamber 23 connected with the corresponding working chamber by an opening of such size that the levels in both chambers are the same, assuming no slip. A scoop-tube 25 provided with a rack, (see Fig. 3), projects into the scoop tube chamber. The position of the inlet opening of the scoop tube determines directly the degree of filling of the corresponding working chamber. A toothed ring 27 engages with the rack and is rotatably mounted on a housing part 29 which also supports the impeller 4. The ring 27 is connected with a turn bolt 31 co-operating with a locking lever 33 fitted on a bevel wheel 35 freely rotatable on the shaft 37 of an operating lever 38. The wheel 35 is moved by a bevel wheel 36, keyed to the shaft 37, through an intermediate wheel 39, the wheel 36 bearing the lever 34 for the scoop-tube. A filling pump 41 is driven by a bevel wheel 40 from the counter shaft 3. In the position of Fig. 3, (lever 38 to the right), the coupling I is being filled by liquid, pumped up the passage 58 of a piston valve arrangement 42, and passing through an opening 47, uncovered by the lower of two members 45, 44, secured to a valve rod 43. The valve rod is operated in synchrony with the scoop tubes from the shaft 37 through a pinion 57 and toothed shaft 56. For quick filling, on sudden movement of the operating lever 38, outer valves 48, 49 are mounted on valves 45 and 44 respectively. The valve 49, for example, is moved against spring 51 by the valve 45 acting through the liquid filling the space 59, and uncovers an annular passage 55 of greater cross-section than opening 47 filling the coupling I. When the valve 45 is moved slowly the liquid in space 59 is vented through slot 60, and valve member 49 remains stationary. To prevent movement of the other valve 48 (and consequent uncovering of passage 54 to coupling II) on quick return of the valve rod 43 to neutral position an opening 61 from the passage 58, and a non-return valve 64 for filling space 59 are provided. The operating mechanism for the scoop-tubes is such that with the lever 38 in neutral position both scooptubes are in their uppermost position and both couplings are consequently empty. With the lever on the right as in Fig. 3 tube 25 is down while tube 26 remains up, and vice versa. The driving shaft 1 is itself driven by, preferably, a squirrel cage motor.