B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
142/33
B62D 3/12 (2006.01)
Patent
CA 1100852
ABSTRACT OF THE DISCLOSURE An improved variable ratio steering apparatus is used to effect turning movement of steerable wheels of a vehicle. The apparatus includes a longitudinally extending force transmitting member or bar which is connected with the steerable vehicle wheels. A drive member is rotatably mounted on the bar. In order to effect axial movement of the bar and turning movement of the vehicle wheels, a pinion gear is disposed in meshing engagement with an array of helical rack gear teeth on the drive member. A cam track is also provided on the drive member. This cam track is coextensive with the array of rack gear teeth. The cam track cooperates with a follower to effect rotational movement of the drive member as the drive member and force transmitting bar are moved axially. This rotational movement of the drive member causes an interaction between the pinion and rack gear teeth to vary the rate of axial movement of the drive member and the force transmitting bar. The follower advantageously engages the cam track at a location which is axially aligned with the location where the pinion gear is disposed in meshing engagement with the rack gear teeth. This tends to minimize deflection of the components of the steering apparatus. Although an apparatus constructed in accordance with the present invention is advantageous- ly used to turn the steerable wheels of a vehicle, it is also contemplated that the apparatus can be used in other environments.
359455
Cam Gears Limited
Fetherstonhaugh & Co.
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