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US 2017/0257015 A1Published application
Linear actuator
AssigneeKYB Corporation
InventorKousuke SATOU
Life of this patent
Estimating the term…
Abstract
A linear actuator includes: a first tube provided with coils placed there inside, the coils being held by a yoke; a second tube mounted on an outer circumference of the first tube; a rod fixed to an end of the second tube at one end; and permanent magnets held by the rod while being lined up in an axial direction. When the first tube and the second tube are at a fully contracted position, a gap is provided between an end face of an outer tube of the second tube and an opposing face of a base portion of the first tube.
Claims7
A linear actuator, comprising:
- a first tube provided with a plurality of coils placed there inside, the plurality of coils being held by a tubular yoke;
- a second tube mounted on an outer circumference of the first tube so as to be relatively displaceable in an axial direction;
- a rod fixed to an end of the second tube at one end so as to be movable in the yoke in the axial direction;
- and
- a plurality of permanent magnets held by the rod while being lined up in the axial direction, the plurality of permanent magnets being arranged so as to oppose the plurality of coils,
- wherein
- the second tube includes an outer tube portion into which the first tube is inserted from one end side,
- the first tube includes:
- an inner tube portion that is inserted into the outer tube portion;
- and a large diameter portion that is continuous with the inner tube portion in the axial direction, the large diameter portion having a larger diameter than that of the inner tube portion and opposing the one end side of the outer tube portion in the axial direction, and
- when the first tube and the second tube are at a fully contracted position, a gap is provided between the one end side of the outer tube portion and the large diameter portion.
8 more elements
Dependencies are inferred from the claim text.