GB628387A - Improvements in or relating to epicyclic gearing - Google Patents

Abstract

628,387. Variable-speed gearing; clutches ; securing elements to shafts. BROCKHOUSE ENGINEERING (SOUTHPORT), Ltd., and GATISS, A. L. March 12, 1946, No. 7769. [Class 80 (ii)] In an epicyclic gear train for use with hydrokinetic transmission apparatus, the reaction element 26 has slidably but non-rotatably mounted thereon a dog clutch sleeve 36, engageable with one other element 30 or a stationary element 33, such sliding movement being effected by the movement of an operating member 76 in one plane, the member being constrained to move in a lateral plane simultaneously to apply a brake 63 to arrest rotation of the sleeve 36. A driving shaft 21 has mounted thereon a sun gear 23 meshing with a plurality of planet gears 24 freely rotatable on the spindles 25 rigid with the side plates 27, 28 which form the planet carrier or reaction member 26. The side plate 28 has an axial flange 35 concentric with the annulus 30 rigid with the driven shaft 22, the flange having splines 37 attached thereto, as has a slidable dog clutch sleeve 36 concentric with the flange 35. Between the splines 37, 38 of the flange 35 and the sleeve 36 are interposed rollers 42, the radial length of which is equal to the distance between the opposed concentric surfaces of the flange and sleeve, these rollers are restrained by the outwardly and inwardly projecting flanges 45, 46 respectively which also project circumferentially at 47. Axial movement of the sleeve 36 is effected by a shifter ring 55 operated from a shaft 60 (not shown) projecting from the side of the casing 20, to provide direct forward speed with the teeth 50 of the sleeve 36 engaged with the teeth 31 of the annulus, neutral when the teeth 50 are between the teeth 31 and the stationary teeth 32 and a reduced reverse drive when the teeth 50 engage the teeth 32. A brake drum 61 is secured to the sun gear 23 and is engaged by an annular braking ring 63 which is displaced inwardly by a braking arm carried on a spindle 69 (not shown) which also projects through the casing. The operating mechanism for the brake and clutch consists of a lever 76 (Figs. 12 and 13) movable in a longitudinal plane relative to a forked carrier 79 which is movable in a transverse plane to allow the lever 76 to co-operate with the three notches 83 of the gate 84 corresponding to the three gear positions. Transverse movement of the lever 76 and therefore carrier 79 is transmitted through the tube 72 and lever 81 to the spindle 60 (not shown) of the clutch sleeve operating mechanism, but this movement is only permitted by the gate 84 after the lever 76 has been moved longitudinally to disengage it from the notches 83, this longitudinal movement being transmitted through the spring loaded rod 85 and the bell crank 88 to the brake spindle 69 (not shown) to apply the brake 63. The gate 84 is arranged with convex faces 96 which ensure that the brake is fully engaged before the clutch sleeve is moved and that the braking force is relaxed before the dog teeth are fully engaged, to promote a rapid change of gear.