| 摘要 |
798,940. Vehicle driving and steering gear. CASE CO.. J. I. May 28, 1956 [June 22, 1955], No. 16443/56. Class 79(2) [Also in Group XXIV] A motor vehicle variable speed gear comprises an input shaft 26 connected by clutch-controlled gearing to two output shafts 34 whereby the output shafts 34 can be driven independently in both directions, the gearing including a drive gear 40 on the input shaft 26, forward and reverse drive gears 48L, 50L (or 48R, 50L) for each output shaft 34, the drive gear being geared to the forward drive gear 48R for one output shaft and the reverse drive gear 50L for the other output shaft, both forward drive gears being connected together by gearing (not shown), both reverse drive gears being also connected together by gearing (not shown), and clutch means for selectively coupling each output shaft 34 to its respective forward or reverse drive gear. As shown in Fig. 1 the variable speed gear is housed in a casing 20 connecting a shaft 22 driven from an engine (not shown) through a torque converter (not shown) to sprockets 12R, 12L of endless tracks 10, 14 carried by the output shafts 34 (only one being shown). The shaft 22 is universally jointed to the input shaft 26 which is connectable through a two-speed gear to the drive gear 40 formed as a gear cluster on the shaft 26, the twospeed gear comprising a clutch member 98 which can connect the cluster 40 to the shaft 26 either directly or through a gear cluster (not shown) meshing with the cluster 40 and a gear 92 clutchable to the shaft 26. The cluster 40 comprises gears 42, 44, the gear 42 meshing with the reverse drive gear 50L connectable through a clutch 52L to a shaft 28L and the gear 50L meshing with a gear 50R connectable through a clutch 52R to a shaft 28R. The gear 44 meshes with the forward drive gear 48R connectable through a clutch 46R to the shaft 28R, and the .gear 48R meshes with a gear 48L connectable through a clutch 46L to the shaft 28L. The shaft 28R is connected to the sprocket 12R through a two-speed gear, a shaft 32R, bevel gearing 76R, a shaft 78R, gearing 82R and the associated output shaft 34, and a similar connection is provided between the shaft 28L and the sprocket 12L. The two-speed gear between the shaft 28R, 32R comprises gears 70R, 72R on the shaft 32R meshing with gears 56R, 58R clutchable to the shaft 28R by clutches 54R, 60R. The clutches 46R, 52R, 54R, 60R are multi-disced, fluid pressure engaged and are normally disengaged. The fluid pressure clutch control system is constructed so that the clutches on the shaft 28R are independent of those on the shaft 28L to facilitate vehicle steering. A brake 84R on the shaft 32R is of similar construction to the clutches on the shaft 28R and is provided to enable the sprocket 12R to be braked. A similar brake is provided for the sprocket 12L. |
