| 摘要 |
1,122,268. Differential steering and braking. SECRETARY OF STATE FOR DEFENCE. 31 Oct., 1966 [4 Nov., 1965], No. 46751/65. Heading B7H. A steering and driving arrangement for a vehicle comprises a differential gear for driving opposed tracks or sets of wheels, hydraulic brakes 29, 30 associated with each track or set of wheels and a closed hydraulic circuit which includes two motor/pumps 18, 19 which are respectively connected to gearing from the differential outputs and are connected to steering mechanism whereby the displacement of one motor/pump increases as the other decreases to control the differential gear outputs, two pipes 23, 24 connecting the output of each motor/pump with the input of the other motor/pump and two regulating valves 27, 28 which are connected between the respective pipe 23, 24 and brake 29, 30 and apply the appropriate brake when the fluid pressure in pipe 23 or 24 reaches a certain value due to the displacement ratio of the motor/pumps 18, 19. As shown in Fig. 1 an engine driven shaft 1 drives the traction means on the two sides of a vehicle through epicyclic gearing units 9, 10 of which the annulus gears 11, 12 are driven through change-speed gearing (shown as two speed) from the differential casing 2 and the sun gears 16, 17 are driven by the differential bevel gears. In straight ahead running the movement of the truck, the pedals 15, 16 or, as shown, rods 36, 37 movable therewith are formed with notches or grooves 62, 63 aligned in the inoperative position of the pedals with a transverse bore 44 containing an interlock rod, roller or ball 46 which prevents each pedal being moved from its inoperative position unless the other pedal occupies its inoperative position and also prevents simultaneous movement of both pedals from the inoperative position. The pedals 15, 16 are mounted on a common pivot bolt 25 and include arms 34, 35 retained by split-pins 42, 43 in forked ends on the rods 36, 37 which are displaceable axially against spring- loading 41. A lever 24 pivotally connected to both rods 36, 37 so as to rotate about its connection to the other rodwhen one rod is displaced is linked to electric or hydraulic control means 20 arranged such that initial depression of the appropriate pedal selects the direction of movement and speed is increased by further depression. Adjustable stops 58 co-operate with projections 56 on the pedals.
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