Patent GB-539301-A (GB)
Title: Improvements in or relating to power transmission mechanisms
IPC: F16H3/60
Filed: 1940-03-02
Abstract: 539,301. Reversing gear; clutches. SNOW & PETRELLI MFG., CO. March 2, 1940, No. 3955. Convention date, Jan. 16. [Class 80 (ii)] A power transmission gearing particularly for use with marine engines, comprises a shaft adapted to be arranged between and in line with a driving shaft and a driven shaft, e.g. the propeller shaft, a coupling at one end for connecting it directly with the driven shaft, a hub at the other end for connecting it to an engine driven member through an axially movable friction element in sliding non-rotative engagement with the periphery of the engine driven member, and a reversing gear arranged concentrically of the shaft intermediate of its ends. In one form, Fig. 1, the the shaft B is provided at one end with a coupling D for connecting it to the propeller shaft and at the other end with a hub 16 carrying a clutch ring 22 for engagement with a member C fixed to the engine driven shaft. The reversing gear comprises a sun gear 99 on a sleeve 98 loose on the shaft B and continuously driven from the member C, a sun wheel 106 fast on the shaft B, long planet wheels 110 meshing with the gear 98 and with short planet wheels 111 meshing with the gear 106, the planet wheels being mounted on a carrier 96 which may rotate freely or be held stationary by a brake band 97 actuated by connections from a manual clutch controlling shaft H. When the clutch is closed, the brake is released and the shaft B is directly driven through the clutch, the planet carrier rotating freely, but when the clutch is opened and the brake is applied to the carrier 96, the shaft is driven in the reverse direction by the sleeve 98 and wheels 110, 111, 106. In neutral position of the shaft H, the clutch is open but the brake is not applied to the carrier 96 so that the carrier rotates idly. The sleeve 63 is keyed to a sleeve 62 driven by a spined connection 55 from a ring 44 fixed to the member C and slidably mounted on the sleeve 62 is a sleeve 68 connected to a number of clutch actuating levers 52 and having fixed to it the inner race 7ia of a ball bearing, the outer race of which is connected through levers 78, 81 with the clutch control shaft H. The clutch ring 22 is slidable axially on the hub 16 by splined connection 28 and is provided with a friction facing on its conical surface to co-operate with an internal cone on the member C and with a flat friction facing 31 to co-operate with a ring 33 slidably connected by splines 39 with the member C. A similar ring 34, also splined to the member C and separated from the ring 33 by coil springs 35 is engaged by plungers 46 carrying rollers 48 engaging cams 49 operated by the clutch actuating levers 52. Clutch releasing springs 36 for the ring 33 are mounted in the member C, and springs 30 for the ring 22 are mounted in the ring 22 and engage pins 29 fixed to the hub 16. The hub 16 may be positively locked to the member C to prevent slipping of the friction clutch, by dogs 59 on the hub adapted to be engaged by dogs 58 on a ring 57 having a spined connection 56 with the ring 44. This ring 57 is slidably mounted on the sleeve 62 and on headed bolts 83 fixed to the sleeve 68, springs 89 on the bolts urging the dogs 58 into locking engagement with the dogs 59. When the friction clutch is engaged, the ring is moved by the springs 89 and the dogs 58 either engage between the dogs 59 or, as shown, engage the ends of the dogs, in which case, upon slight slippage of the friction clutch, the dogs completely engage to prevent further slippage. In a modification, the dogs 59 and ring 57 are omitted. In a further modification, Fig. 8, the rings 33, 34 are replaced by a single ring 123 actuated directly by plungers 124, the clutch actuating arms 126 being pivoted to plungers 127 arranged between the plungers 124 and a ring 130 adjustable on the ring 128 to take up wear on the clutch. In a further modification, the rings 33, 34 are replaced by a series of friction plates operated by plungers as in the construction of Fig. 8. In the construction shown in Fig. 11, the planet wheels 203, 204 engage internal gears 193, 199 on sleeves 192, 198 respectivly free upon and keyed to the shaft B<1>. The sleeve 192 is driven continuously by a sleeve 188 having a splined connection 187 with the engine driven member C<3>. The hub 161 is in the form of a double cone and is engaged by clutch rings 165, 166 spined to the member C<3>. Springs 171 tend to separate the rings 165, 166 and springs 170 are also arranged between the ring 165 and an adjacent ring 169. The clutch operating arms 175 are pivoted to bolts 172 passing freely through the rings 166, 165 and fixed to the ring 169, the cams 177 of the arms 175 engaging rollers 178 carried by lugs 180 on the ring 166.