Patent GB-962767-A (GB)
Title: Change speed transmissions
IPC: F16H3/08
Filed: 1961-12-29
Abstract: 962,767. Change-speed gear. CLARK EQUIPMENT CO. Dec. 29, 1961 [Dec. 29, 1960], No. 46652/61. Headings F2C and F2D. A constant-mesh change-speed and reverse gear for vehicles has two intermediate shafts and parallel input and output shafts, means for driving the intermediate shafts selectively from the input shaft including a plurality of gears and four clutches associated two each with each intermediate shaft, and two gears fast on the output shaft and respectively meshing gears fast on the intermediate shafts. Figs. 4 and 7 show a gear providing four forward and four reverse speeds, an output shaft 98 having gears 96, 102 fast thereon meshing gears 94, 100 fast on intermediate shafts 74, 76. Gears 86, 90 are clutchable to the shaft 74 by clutches 78, 80 and gears 88, 92 are clutchable to the shaft 76 by clutches 84, 82. Gears 88, 86 both mesh a gear 68 fast on an idler shaft 70 which also carries a gear 72 meshing both gears 90, 92. Gear 68 meshes a gear 62 clutchable to an input shaft 16 by a clutch 60 which is engaged for forward drive. For reverse drive the gear 68 is driven by a gear 66 clutched to a shaft 58 by a clutch 64, the shaft 58 being connected to the input shaft 16 by gears 56, 54. The actual disposition of the shafts is as shown on the right-hand side of Fig. 7. Shaft 98 drives the rear wheels of the vehicle. A shaft 32 for driving the front wheels is clutchable to the shaft 98 by a clutch sleeve 111 which is slidably splined on the shaft 98 and has facial teeth engageable with facial teeth of a collar 115 which is secured to the shaft 32. A power take-off shaft 160 for driving ancillary devices is clutchable to the idler shaft 70 by an axially slidable internally-toothed clutch collar 162 engaging external splines on the idler shaft. Clutches.-All the friction clutches are hydraulically engaged multi-plate clutches. Clutches 60, 64, 80, 84 are identical and clutches 78, 82 differ only in size. Clutch 60 has an outer drum 120 (see Fig. 5), formed integrally with the gear 62 and mounted by bearings 118, 119 on a stationary sleeve 112 which surrounds the input shaft 16 which is fast with a clutch hub 126. An annular piston 132 for engaging the clutch plates is housed in a cylinder formed in the drum 120, liquid for engaging the clutch being supplied through passages 135, 136 in the sleeve 112 to the cylinder to act initially on a portion 142 of the piston to give rapid piston movement. When a shoulder 144 of the piston clears a shoulder 146 of the drum 120 pressure is applied to the full area of the piston to give full clutch engaging pressure. Liquid is released from the cylinder by opening a ball valve 148, whereupon springs 157 disengage the clutch. The clutch is cooled by liquid supplied through passages 150, 152 and through ports 156 to the clutch plates and escaping through ports to a sump. The liquid also passes through a 158 passage 151 to lubricate a bearing 52 supporting the driving shaft. In a modifccation providing six forward and two reverse ratios (Fig. 10, not shown), idler gears are interposed between the gears 54, 56 and between the gears 90, 72. In another modification (Fig. 8, not shown), the output shaft is in the position occupied by the idler shaft in the illustrated embodiment, and in this case a gear freely mounted about the output shaft transmits drive from the forward and reverse gears 62, 66 to the gear 86. In all embodiments the output shaft 98 may drive a planetary gear having a sun 202 (see Fig. 11), fast on the shaft 98, a permanently stationary ring gear 210 and a planet carrier 208 clutchable to a final shaft 204 by an axially slidable externally toothed clutch sleeve 212 engaging teeth 218 on the carrier. The clutch sleeve is slidable to the left to disengage the teeth 218 and engage internal teeth 216 on the shaft 98 for direct drive. Specification 962,768 and U.S.A. Specification 2,954,040 are referred to.