Patent GB-1295135-A (GB)
IPC: F16H3/54
Filed: 1970-04-27
Abstract: 1295135 Change-speed gear WHITE MOTOR CORP 27 April 1970 [28 April 1969] 20122/70 Heading F2D A motor - vehicle transmission, providing eighteen forward and six reverse ratios, comprises a sun-ring-planet train, one element, e.g. the planet carrier 26 of which is united to an output shaft 30, whilst, of the other two elements, one, a sun 20 is fast to an aligned intermediate shaft 36 (described as a second countershaft) adapted to be driven at variable ratios from an aligned input shaft 34 through selectively clutched gear trains and at least one countershaft 35, and including an internal ring gear 64, for obtaining some of the reverse as well as some forward ratios, whilst the third planetary element, e.g. the ring gear, 22, can also be driven separately at variable ratios through the countershaft paths, can be held stationary for planetary series reduction in forward and reverse, clutched to the sun 20 for planetary lock-up, or driven simultaneously with the sun for split-torque ratios. Two or three equal countershafts 35 carry fast wheels meshing floating wheels 46, 48, 52, 55. Splined double clutches 58, 60 clutch any of the wheels 46, 48, 52 to the input shaft 34 at A, B, C, whilst a splined double clutch 62 clutches either wheel 52 or 55 to the intermediate shaft 36 at D, F. A further double splined clutch sleeve 66 clutches to the intermediate shaft 36 at E the internal ring gear 64, meshing the countershaft wheel 56, and at J the freely mounted planetary ring gear 22, to lock up the planet train for series direct drive. A double clutch 68, fast with the planetary ring gear 22, clutches the latter at H to the countershaft ring gear 64, for the split torque drive, and at L to a fixed member for holding the ring 22 for seriesreduced drive. Ratios, all of which are specified numerically, along with wheel sizes and percentage ratio steps, are as follows. The first six forward, counting downwards from direct drive top ratio, as well as the first three reverse, use the clutch J to lock up the planet train for series direct drive, the forward ratios using additionally clutches CD, CF, AD, AF, BD and BF, whilst the reverse ratios use the clutch H for take-off from the ring gear 64 to the locked planet gear, with also clutch C, A or B. The next six forward use the same combination of two clutches, but with L replacing J to hold the planetary ring gear for series reduction, the next three reverse operating similarly, but with the clutch E as well as L, and again with clutch C, A or B. The remaining six forward use the clutch H for split-torque drive to the ring and sun of the planet train with additionally clutches CD, AD, CF, BD, AF and BF.  Not all these ratios are necessarily used, a lesser number being selected by means of interchangeable control units suitable for the conditions of service for which the vehicle is intended. Control.-Clutches 58, 60 (A, B, C) are operated mechanically by a ball-mounted manual shift-lever (86, Fig. 3, not shown) moving in an H-pattern, and carrying a valve-box with three small manual levers (126, 128, 130) supplying compressed air to one side or other of three double-acting piston motors actuating the clutches 62, 65 and 66. Modification.-In Fig. 13 (not shown), the clutches B, F are on the countershaft 35 instead of as shown.