GB190700063A - Improvements in or relating to Speed Gears. - Google Patents

Abstract

63. Cordner, R. A., and Humber, Ltd. Jan. 1. Driving-mechanism.-Relates to means for controlling the sun-pinions in epicyclic variable gearing of the kind in which two sliding sun-pinions are used. These pinions B, C are constrained to slide together and are free to rotate independently upon a fixed axle A. The pinion B is in constant mesh with a series of planet-pinions B' which are carried by the driven member B<2> of the gear and engage an annulus B<3> upon the driving member B<4>. The pinion C is in constant mesh with planet-pinions C<1> carried by the member B<4> and gearing with an annulus C<2> upon the member B<2>. Either gear train becomes operative for the low or the high speed according as the pinion B or the pinion C is held against rotation by sliding it outwards into engagement with one or other of the claw clutch members D<1>, E<1> fast on the axle A. The intermediate drive is obtained by providing a claw-clutch member H rigid with one of the sun-pinions adapted to be engaged with a clutch member rigid with the driving or the driven member of the gear so as to lock one gear train solid. In the arrangement shown in Fig. 1, the member H is rigid with the pinion C and engages a clutch member H<2> upon the driving-member B<4>. The pinions B, C are placed end to end and traversed together by means of connecting-pieces F carried upon an operating-rod F<1>. The pieces F are provided with projections F' entering annular grooves F<3> in the pinions B, C and are held between a shoulder on the rod F<1> and a nut F'. In a modified form, the pinions B, C are held together by feathers J, Fig. 4, sunk in the axle A and provided with projections J<1> engaging a groove in the pinion B. A cross-piece J<2> fast upon the rod F<1> and able to slide in a slot in the axle A passes outwardly through the feathers J on either side into a groove in the pinion C.