GB1061422A - Improvements in or relating to gear transmissions - Google Patents

Abstract

1,061,422. Toothed gearing. GASTURBINENBAU UND ENERGIEMASCHINENENTWICKLUNG PIRNA, VEB. Sept. 5, 1963. No. 35046/63. Heading F2Q. An epicyclic gear for only one direction of rotation of input shaft 30 and output shaft 35, comprises planet gears 41, 42, 43, 44 the gears 41, 42 being integral and of opposite hand, and the gears 43, 44 also being integral and of opposit hand. Outer gears 41, 44 mesh sun gears 31, 32 on input shaft 30 and inner gears 42, 43 mesh ring gears 11, 12 mounted in the casing 1. A cavity 50 between inner gears 42, 43 forms a thrust balancing chamber to which lubricating oil is fed under pressure from a pump 51 through pipe 70 and passages 74-78. The pressurized fluid can escape from the thrust balancing chamber 50 through a control gap 50a and a channel 79 whence it can return to a pump reservoir. 52 through pipe 81. In modifications, shown in Fig. 2, two thrust balancing chambers are provided whereby the axial thrust may be balanced for either direction of rotation of input shaft 30. As shown in the upper half of Fig. 2, an annular piston 91<SP>1</SP> separates two thrust balancing chambers 50<SP>1</SP>, 90<SP>1</SP> formed in the gear 41. The pressurized fluid can escape through control gap 50a<SP>1</SP>, 90a<SP>1</SP> and passages 111, 109<SP>1</SP>. Fluid is directed to the appropriate chamber 50<SP>1</SP> or 90<SP>1</SP> by means of a three-way cock 95. The lower half of Fig. 2 shows a thrust balancing chamber 50 formed between the planet wheels and a thrust balancing chamber 90 formed by a piston 91, and located on the opposite side of the central web of one of the planet wheels. Fluid may escape from the chambers 50, 90, through control gaps 50a, 90a and passages 79 and 109. Fig. 3 shows an arrangement of countershaft gearing comprising helical-gears 131, 132, of opposite hand, secured to a driving shaft 130 helical gears 136, 137, of opposite hand, secured to a driven shaft 135, and intermediate helical gears 141-144 mounted on coaxial shafts 140, 250. The control gears 143, 144 are mounted on shaft 250 which has a piston-like end. 261 engaging, a cylindrical recess 262 in the gear 141, which is integral with shaft 140. The gear 142 is mounted on the other end of shaft 140. The two pairs of helical gears 141, 142 and 143, 144 have different diameters. A balancing chamber 150 is formed within gear 141 by piston 261 and is supplied with fluid from a pump 151 Fluid escapes from the chamber through a control gap 150a and passage 179.