Linear actuator
First Claim
1. A linear actuator that produces thrust in a moving part by electromagnetic force that acts in a direction perpendicular to a direction of a current flowing in a coil and to a magnetic field formed in a yoke-part, the linear actuator comprising:
- a yoke part where yoke components, where a hollow is formed between an outer circumferential surface of a first yoke provided on one side of a ring-shaped permanent magnet and an inner circumferential surface of a second yoke provided on another side of the ring-shaped permanent magnet, are combined on an outer circumference of a guide pipe with end surfaces of the first yokes and/or end surfaces of the second yokes being in contact and magnetic poles formed in facing yoke surfaces having a same polarity; and
a shaft-linked part where a coil bobbin, which is disposed in the hollow of the yoke part and around which a coil has been wound, and a shaft inserted into the guide pipe are linked, wherein by switching the direction of the current flowing in the coil, relative movement between the yoke part and the shaft-linked part is reciprocally caused in an axial direction.
1 Assignment
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Accused Products
Abstract
A linear actuator has improved output performance and can be assembled with high precision. The linear actuator includes: a yoke part where yoke components, where a hollow is formed between an outer circumferential surface of a first yoke provided on one side of a ring-shaped permanent magnet and an inner circumferential surface of a second yoke provided on another side of the ring-shaped permanent magnet, are combined on an outer circumference of a guide pipe with end surfaces of the first yokes and/or end surfaces of the second yokes being in contact and magnetic poles formed in facing yoke surfaces having a same polarity; and a shaft-linked part where a coil bobbin, which is disposed in the hollow of the yoke part and around which a coil has been wound, and a shaft inserted into the guide pipe are linked. By switching the direction of the current flowing in the coil, relative movement between the yoke part and the shaft-linked part is reciprocally caused in an axial direction.
18 Citations
7 Claims
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1. A linear actuator that produces thrust in a moving part by electromagnetic force that acts in a direction perpendicular to a direction of a current flowing in a coil and to a magnetic field formed in a yoke-part, the linear actuator comprising:
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a yoke part where yoke components, where a hollow is formed between an outer circumferential surface of a first yoke provided on one side of a ring-shaped permanent magnet and an inner circumferential surface of a second yoke provided on another side of the ring-shaped permanent magnet, are combined on an outer circumference of a guide pipe with end surfaces of the first yokes and/or end surfaces of the second yokes being in contact and magnetic poles formed in facing yoke surfaces having a same polarity; and
a shaft-linked part where a coil bobbin, which is disposed in the hollow of the yoke part and around which a coil has been wound, and a shaft inserted into the guide pipe are linked, wherein by switching the direction of the current flowing in the coil, relative movement between the yoke part and the shaft-linked part is reciprocally caused in an axial direction. - View Dependent Claims (3, 4, 5, 6, 7)
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2. A linear actuator that produces thrust in a moving part by electromagnetic force that acts in a direction perpendicular to a direction of a current flowing in a coil and to a magnetic field formed in a yoke part,
the linear actuator comprising: -
a yoke part produced by combining, on an outer circumference of a guide pipe, yoke components in each of which a first yoke is provided on one side of a ring-shaped permanent magnet and a second yoke with a larger diameter than the first yoke is provided on another surface of the ring-shaped permanent magnet, a hollow being formed between an inner circumferential surface of a tubular third yoke, which is disposed between the second yokes of the yoke components, and outer circumferential surfaces of the first yokes, and magnetic poles formed in end surfaces of the adjacent first yoke surfaces having a same polarity; and
a shaft-linked part where a coil bobbin, which is disposed in the hollow of the yoke part and around which a coil has been wound, and a shaft inserted into the guide pipe are linked, wherein by switching the direction of the current flowing in the coil, relative movement between the yoke part and the shaft-linked part is reciprocally caused in an axial direction.
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Specification