| 摘要 |
1349984 Vehicle steering mechanism LANSING BAGNALL Ltd 7 Feb 1972 [12 Feb 1971] 4578/71 Heading B7H A differential gear mechanism for imparting differing angular deflection to two transversely spaced steerable wheels includes two spaced gear-wheels 23, 25 and an intermediate elliptical gear-wheel 27 which is moved laterally between the gear-wheels 23, 25 as it rotates to effect differential rotation of the gear-wheels 23, 25. The eccentricity of the elliptical gear-wheel 27 is such that the gear 27 remains in mesh with the gears 23, 25 as it moves laterally between them. As described the steerable wheels (not shown) are carried by supports 11, 12 which are mounted in bearings 13, 14 in a frame 10. The supports 11, 12 carry gear-wheels 15, 16 respectively. The support 11 is rotated by a steering column 21 which acts via pinions 20, 19, shaft 18 and pinion 17 in mesh with gear 15. The gear 15 drives the gear 16 through the differential gear mechanism 23, 27, 25 to effect differential rotation of the wheel support 12. The gearwheels 23, 25 are carried by stub shafts 24, 26 mounted on the frame 10 and the elliptical gear wheel 27 is slidably mounted between two fixed members 34, 35 in the frame 10. The elliptical gear-wheel 27 carries an eccentrically mounted shaft having rollers 30, 31 at each end, the rollers being disposed in slots 32, 33 in the fixed members 34, 35. Thus the rollers and slots cause the gear 27 to be moved laterally as it rotates. |
