Patent GB-1159872-A (GB)
Title: Improvements in or relating to Driving Installations for Motor Vehicles, more particularly for Agricultural Vehicles
IPC: F16H37/02
Filed: 1967-02-22
Abstract: 1,159,872. Motor vehicle driving gear. ZAHNRADFABRIK FRIEDRICHSHAFEN A.G. 22 Feb., 1967 [22 Feb., 1966], No. 8524/67. Heading B7H. [Also in Division F2] In a drive, particularly for agricultural vehicles, an infinitely variable (I-V), eg hydrostatic or, as shown, chain drive gear, such as 6, interposed between an engine 1 and a toothed-wheel change-speed (C-S) gear, such as 53 shown, is arranged to be by-passed by a power-take-off (P-T-O) drive, such as 54. Provision is made for drive of vehicle implements as a function of engine speed, e.g. constant, for trailed harvester threshers; at variable speed independently of the vehicle, e.g. forestry winch drives operative with the vehicle stationary; or as a function of travelling speed, e.g. single-axled trailers. In Fig. 1, the engine 1 drives the I-V gear 6 through a two-speed (direct-reduced) gear 5, 10, 11, 12 providing dead slow vehicle speed and operated by a double clutch 13 which acts as a separating clutch facilitating cold engine starting. An auxiliary, e.g. pump, 15 may be driven at engine speed via the gear 10. The I-V gear 6 and C-S gear 53 are connectible by a dog or friction clutch 16. The C-S gear 53 is operated by two double clutches 20, 28 and provides two forward and two reverse ratios for the drive to the rear wheels 34. The P-T-O drive 54 from the engine 1 to a P-T-O shaft 43 comprises, in series, a dog or friction clutch 3, a two-speed gear 37, 40 operated by a double clutch 41, a shaft 36 and a clutch 44. The shaft 36 is connectible by a clutch 45 and a gear 42 to a gear 25 of the C-S gear 53, and optionally to the input shaft 7 of the I-V gear 6 by gears 57, 58. A shaft 48 drivingly connected to the front wheels 52 is connectible to the gear 42 by a clutch 47 and a gear 46 for one forward and one reverse ratio front wheel drive independently, or jointly with, the rear wheels. Rear and/or front wheel travelling drive, by-passing the I-V and C-S gears 6, 53 is via the clutch 3, clutch 41, shaft 36, clutch 45 and gear 42. This by-pass drive may provide forward and reverse when an idler 56 is provided in the gear 37-40. In the rear wheel drive of Fig. 2 (not shown), the I-V and C-S gears are disposed in a common housing (96), and the clutch (74) between these gears is disposed outside the housing between the latter and the engine. The change-speed gear provides forward and reverse and includes a synchromesh double clutch (83). A P-T-O shaft is connectible to the engine and/or the I-V gear output by clutches (93), (94). In an alternative arrangement the clutches 93, 74 may form a unit. In the similar arrangement of Fig. 3 (not shown), the clutch between the I-V and C-S (forward/reverse) gears is a double, dry, friction clutch by which the C-S gear ratios are brought in. In the rear wheel drive of Fig. 4, the I-V gear 145 is driven by the engine 141 through gears 143, 144 and a clutch 146. A shaft 148 is connectible to the C-S gear 151 by a clutch 150 and to the I-V gear output shaft 147 or the engine shaft 142 (via gears 155, 154) by a double clutch 149. A sliding gear/clutch 160 is rightwardly moved to connect the I-V gear output shaft 147 to a gear 161 which in turn is connectible to the engine shaft 142 by a clutch 2 and to a P-T-O shaft 158 by a gear 157 and a clutch 159.