Position servo systems
First Claim
1. A position servo system comprising:
- a driven mechanism (4);
a first rotary actuating member (1,
3) by which an operative control is applied to the driven mechanism (4);
a continuously-variable-ratio transmission having a roller assembly; and
means responsive to an error (34) (20, 37, 51,
2) between a position of the driven mechanism (4) and the first rotary actuating member (1,
3) for varying a position of at least one roller thereby to create a power output from the continuously-variable-ratio transmission to apply torque to the driven mechanism to diminish the error.
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Accused Products
Abstract
A position servo system exemplified by a power-assisted steering system in which a power-driven continuously-variable-ratio transmission ("CVT") of the variable-ratio-epicyclic type, and particularly of the toroidal-race rolling-traction type, is arranged coaxially with the wheel or other rotary actuating member and the steering or other driven mechanism, and delivers an output to augment the steering effort in response to an error between the positions of the actuating member and the steering mechanism. Mechanisms described to prevent interference with the normal manual connection between the actuating member and the steering mechanism should the CVT cease to rotate, and on occasions when the normal sense of operation is reverse and the steering mechanism tends to steer the actuating member. Mechanisms are also described, where the CVT is of the toroidal-race type, to ensure quality between the forces exerted on the steering mechanism by all its connections with the CVT.
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Citations
16 Claims
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1. A position servo system comprising:
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a driven mechanism (4); a first rotary actuating member (1,
3) by which an operative control is applied to the driven mechanism (4);a continuously-variable-ratio transmission having a roller assembly; and means responsive to an error (34) (20, 37, 51,
2) between a position of the driven mechanism (4) and the first rotary actuating member (1,
3) for varying a position of at least one roller thereby to create a power output from the continuously-variable-ratio transmission to apply torque to the driven mechanism to diminish the error. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification