Linear actuator and preferred application
OwnerGerd Hoermansdoerferinventor
Life of this patent
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Abstract
The invention concerns a linear actuator for the conversion of a rapid rotational movement with low moment into a slow linear movement with high force. The concept of a special roller drive of planet gears and two ring wheels makes possible purely theoretically infinitely large reductions with relatively high efficiency. As preferred application of this linear actuator device there is suggested an integration in an electric driven brake system for example for automobiles. The inventive linear actuator is realizable with comparatively small constructional expenditure and in very small construction sizes.
Claims21
Device for the conversion of a rotational movement in a translational movement, comprised of:
- a first internally threaded ring wheel;
- a second ring wheel having a pitchless internal surface;
- and
- a roller drive unit with at least one planet roller rolling within said first internally threaded ring wheel, wherein said at least one planet roller at least in a first section exhibits an outer threading and in a second section at least a pitchless circumscribing working surface, whereby during the orbiting of the planet roller its outer threading rolls upon the inner threading of said first ring wheel and wherein at the same time its pitchless circumscribing working surface rolls upon the pitchless internal circumscribing working surface of said second ring wheel, wherein the relationship between the working circle diameter of the outer threading of the planet roller and the working circle diameter of the internal threading of the ring wheel is not the same as the thread start relationship between the outer threading of the planet roller and the inner threading of the ring wheel, resulting in an axial relative movement between the planet roller and the internally threaded ring wheel during the rolling process.
Device for the conversion of a rotational into a translational movement, comprised of a roller drive mechanism with at least one planet roller running about a threaded spindle, wherein the planet roller at least in a first section exhibits an outer threading and in a second section at least a pitchless circumscribing working surface, wherein during the orbiting of this planet roller its outer threading rolls upon the outer threading of the thread spindle and at the same time its pitchless circumscribing working surface rolls upon the pitchless circumscribing working surface of an axis projection, wherein the relationship between the working circle diameter of the outer threading of the planet rollers and the working circle diameter of the outer threading of the spindle is unequal to the thread start number relationship between the outer threading of the planet roller and the outer threading of the spindle, resulting in an axial relative movement between the planet roller and the spindle during the rolling process.
Device according to one of the preceding claims, wherein the planet roller(s) are rotatably mounted in a cage (44, 23, 42/43) in parallel to the axis thereof.
A vehicle comprising as component of a brake system a device for the conversion of a rotational movement in a translational movement, comprised of:
- a first internally threaded ring wheel;
- a second ring wheel having a pitchless internal surface;
- and
- a roller drive unit with at least one planet roller rolling within said first internally threaded ring wheel, wherein said at least one planet roller at least in a first section exhibits an outer threading and in a second section at least a pitchless circumscribing working surface, whereby during the orbiting of the planet roller its outer threading rolls upon the inner threading of said first ring wheel and wherein at the same time its pitchless circumscribing working surface rolls upon the pitchless internal circumscribing working surface of said second ring wheel, wherein the relationship between the working circle diameter of the outer threading of the planet roller and the working circle diameter of the internal threading of the ring wheel is not the same as the thread start relationship between the outer threading of the planet roller and the inner threading of the ring wheel, resulting in an axial relative movement between the planet roller and the internally threaded ring wheel during the rolling process.
Dependencies are inferred from the claim text.