| 摘要 |
988,336. Motor vehicle driving gear. SAABERGTECHNIK G.m.b.H. Dec. 17, 1962 [Dec. 18, 1961], No. 47485/62. Heading B7H. A driving arrangement for an endless track vehicle comprises a drive shaft 1 and driven shafts 2 and 3 for operating the two tracks, respectively, gears 4a and 5a rotatable on shaft 2 and gears 6a and 7a rotatable on shaft 3 being in constant mesh with gears 1a and 1b connected to shaft 1, there being idler gears 16 between the gears 5a and 7a and gear 1b, the drive being transmitted to the shafts 2 and 3 by operating clutches 4 or 5 and 6 or 7 through levers 8 and 9 pivoted at 10 and 11, respectively, and operated by servo-devices 12 and 13, 14 and 15. The servo-devices 12, 13, 14 and 15 are connected in an hydraulic circuit including a pump 26, a pressure control valve 27 and changeover valves 21 and 22 which determine the flow of pressure fluid to the valves 12 or 13, and 14 or 15 respectively. Hydraulic condensers 31 and 32 are connected in the circuit and electromagnetically operated valves 33 and 34 are in series with switches 39 and 40 supplied from a power source 41, the switches 39 and 40 being actuated by operation of the brake pedals 35 and 36 respectively such that when a brake pedal is depressed to stop one or other of the tracks, the supply of pressure fluid to the servomotors 12, 13 or 14, 15 on that side is short circuit and the corresponding clutches are released. The clutches are operated for forward or reverse motion or for turning in a circle by operation of the valves 21 and 22. A pressure fluid supply line 23a and return 28 lead to a speed control device. |
