Rolling contact screw-and -nut transmission device, and linear actuator comprising this device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
N/A
Issued Date -
Jan 17, 2002
app pub date -
Apr 23, 2001
filing date -
Jan 21, 2000
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A linear actuator comprises an electric motor and a screw-and-nut transmission device in which the nut member comprises a planet-carrier member driven in rotation about the axis of the screw, and at least one planet mounted so that it is free to turn on the planet-carrier member about an axis that is parallel to and set at a distance from the axis of the screw. The planet has a plurality of collars set in planes perpendicular to the axis of the screw which engage respective portions of the bottom of the thread of the screw, in such a way that, as a result of the rotation of the planet-carrier member, the planet rolls around the screw forcing the latter to translate axially due to the engagement of each collar against the sides of the respective portion of the thread of the screw.
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