GB662905A - Improvements in gear sets - Google Patents

Abstract

662,905. Toothed gearing; shaft couplings. THORNTON, A. A. (Falk Corporation). Aug. 19, 1949, No. 21592/49. Classes 80 (i) and 80 (ii) A gear unit is designed so that the torque transmitted is equally divided between six or, in a modification, twelve lay shafts. The gear housing comprises parts 10, 11 bolted together and supporting therebetween a disc 13. A low-speed shaft 14 carries an annular gear 17 meshing with six equally spaced pinions 18. These pinions are carried by shafts 19, preferably hollow, journalled in the disc 13 and housing 11, and alternate shafts 19 carry three gears 22, forming a symmetrical group in one plane, and three gears 22<SP>1</SP> in another plane. The groups of gears 22, 22<SP>1</SP> have simple helical teeth, the helices for the two groups being of equal angle but opposite hand, and mesh with coaxial pinions 24, 24<SP>1</SP> carried by high-speed floating shaft 23, which is preferably hollow and is coupled through teeth 25 to a member 26. In a modification, Fig. 2 (not shown), double helical gears are used throughout, the two coaxial high-speed pinions being carried by separate floating sleeves connected to the highspeed shaft by a rocking-pin coupling similar to that shown at 72 in Fig. 3. The gear unit shown in Fig. 3 has twelve lay shafts 59 each carrying a gear 58 meshing with an annular gear 57 secured to a low-speed shaft 54, and four groups of helical gears 62, 621, 64, 641. The shafts 59 are journalled in a disc 53 and in a ring 60 formed on a structure 61 bolted to the disc 53. The groups of gears are symmetrically arranged, six at each end of the set of shafts 59, around a high-speed shaft 68 and mesh with helical pinions 63, 63<SP>1</SP> and 65, 65<SP>1</SP> formed in pairs on floating hollow shafts 66, 67. A plurality of pins 72 rockably seated in a collar on the shaft 68 rockably engage flanges 74 on the hollow shafts 66, 67 to form a flexible coupling between the shafts 66, 67 and 68. Each gear 62, &c. is adjustably secured to the shaft 59 by a clamping device comprising a tapered seat 76 on the shaft, tapered surfaces 77, 81 on the hub 78 of the gear, and a tapered clamp ring 79 splined to the shaft. The ring is fixed to a head 82 having a stem 83 within the shaft 59 and may be tightened by a nut 84.