Screw actuator with a fixed nut
AssigneeSKF Industrie S.p.A.
InventorsHenk Kapaan, Alexander De Vries, Carl Vissers
Life of this patent
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Abstract
A screw actuator comprises a housing (1), a screw mechanism (4) with a nut (6) and a screw (5), as well as a motor (7) which is drivingly connected to the screw. The screw (6) is rotatably and translatably supported with respect to the nut (5), which is fixed with respect to the housing (1). The screw engages a translatable, non rotatable actuating head (29) through a swivel connection. The swivel connection comprises a pair of conformed surfaces (41, 42) having a common rotational axis of symmetry which is aligned with the axis of the screw mechanism.
Claims5
A screw actuator, comprising:
- a housing;
- a screw mechanism with a nut and a screw;
- and
- a motor which is drivingly connected to the screw, said screw being rotatably and translatably supported with respect to the nut which is fixed with respect to the housing, the screw engaging a translatable, nonrotatable actuating head through a swivel connection comprising a pair of conformed surfaces having a common rotational axis of symmetry which is aligned with an axis of the screw mechanism;
- wherein a stack of piezo-electric material layers is enclosed between the surfaces, wherein the surfaces are spherical;
- and
- wherein the screw comprises a convex surface, and the actuating head comprises a correspondingly shaped concave surface, or vice versa.
A screw actuator, comprising:
- a housing;
- a screw mechanism with a nut and a screw;
- and
- a motor which is drivingly connected to the screw, said screw being rotatably and translatably supported with respect to the nut which is fixed with respect to the housing, the screw engaging a translatable, nonrotatable actuating head through a swivel connection comprising a pair of conformed surfaces having a common rotational axis of symmetry which is aligned with an axis of the screw mechanism;
- wherein a stack of piezo-electric material layers is enclosed between the surfaces, wherein the surfaces are spherical and constitute a ball swivel connection;
- and
- wherein the screw comprises a convex surface, and the actuating head comprises a correspondingly shaped concave surface, or vice versa.
Dependencies are inferred from the claim text.