Contactless torque sensor for steering system
First Claim
1. A contactless torque sensor for a steering system, which is installed between an input shaft connected to a steering wheel and an output shaft connected to a vehicle wheel to detect a twist generated by rotational operation of the steering wheel, comprising:
- a magnetic force generating part coupled to the input shaft and having a plurality of N pole magnets and S pole magnets alternatively on an outer circumferential surface thereof;
a magnetic shield part having a shape of a hollow cylinder, coupled to the output shaft and having a plurality of holes to be located within areas of the N pole magnets and the S pole magnets;
a magnetic detection part provided at a distance from an outer surface of the magnetic shield part and detecting a magnetic force passing through a plurality of the holes; and
a magnetic detection sensor part located at an outer surface of the magnetic detection part to detect a change of a relative twist between the magnetic force generating part and the magnetic shield part,wherein the magnetic shield part comprises a first magnetic shield part that has first through holes formed at a predetermined interval therebetween on an upper outer surface and a second magnetic shield part that has second through holes formed at a predetermined intervals therebetween on a lower outer surface to be alternately disposed with the first through holes,wherein the magnetic detection part comprises a first magnetic detection member that detects a magnetic force passing through the first through holes, and a second magnetic detection member that is located at a distance from a lower side of the first magnetic detection member and detects the magnetic force passing through the second through holes.
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Accused Products
Abstract
The present invention relates to a contactless torque sensor for steering system which is installed between an input shaft connected to a steering wheel and an output shaft connected to vehicle wheels and detects torsion generated by rotational manipulation of the steering wheel. The torque sensor comprises a magnetism generation unit coupled with the input shaft wherein north and south pole magnets are arranged along an outer circumference, a cylindrical magnetic shielding unit connected to the output shaft and comprising holes placed near the magnets, a magnetic detection unit distanced from the outer circumference of the magnetic shielding unit and detecting magnetism passing through the holes, and a magnetic detection sensor placed on an outer circumference of the magnetic detection unit and detecting torsion of the magnetism generation unit and magnetic shielding unit. The present invention allows detecting torque of the output shaft with magnetism induced only once.
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Citations
33 Claims
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1. A contactless torque sensor for a steering system, which is installed between an input shaft connected to a steering wheel and an output shaft connected to a vehicle wheel to detect a twist generated by rotational operation of the steering wheel, comprising:
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a magnetic force generating part coupled to the input shaft and having a plurality of N pole magnets and S pole magnets alternatively on an outer circumferential surface thereof; a magnetic shield part having a shape of a hollow cylinder, coupled to the output shaft and having a plurality of holes to be located within areas of the N pole magnets and the S pole magnets; a magnetic detection part provided at a distance from an outer surface of the magnetic shield part and detecting a magnetic force passing through a plurality of the holes; and a magnetic detection sensor part located at an outer surface of the magnetic detection part to detect a change of a relative twist between the magnetic force generating part and the magnetic shield part, wherein the magnetic shield part comprises a first magnetic shield part that has first through holes formed at a predetermined interval therebetween on an upper outer surface and a second magnetic shield part that has second through holes formed at a predetermined intervals therebetween on a lower outer surface to be alternately disposed with the first through holes, wherein the magnetic detection part comprises a first magnetic detection member that detects a magnetic force passing through the first through holes, and a second magnetic detection member that is located at a distance from a lower side of the first magnetic detection member and detects the magnetic force passing through the second through holes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A contactless torque sensor for a steering system, which is installed between an input shaft connected to a steering wheel and an output shaft connected to a vehicle wheel to detect a twist generated by rotational operation of the steering wheel, comprising:
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a magnetic force generating part coupled to the input shaft and having a plurality of N pole magnets and S pole magnets alternatively on an outer circumferential surface thereof; a magnetic shield part as a single hollow cylinder disposed at an radially outer side of the magnetic force generating part and coupled to the outer shaft, including an upper shield surface that has a plurality of upper through holes at an interval therebetween to be the same as that between one of the N pole magnets and the S pole magnets and a lower shield surface that has a plurality of lower through holes at an interval therebetween to be the same as that between the other of the N pole magnets and the S pole magnets; a magnetic detection part including an upper magnetic collecting member which has an upper magnetic flux collecting ring collecting a magnetic flux that passes through the upper shield surface, an upper magnetic flux collecting flange extending radially from an upper end of the upper magnetic flux collecting ring to a predetermined width and an upper magnetic collecting terminal bent from a side part of the upper magnetic flux collecting flange, and a lower magnetic collecting member which has a lower magnetic flux collecting ring collecting a magnetic flux that passes through the lower shield surface, a lower magnetic flux collecting flange extending radially from a lower end of the lower magnetic flux collecting ring to a predetermined width and a lower magnetic collecting terminal bent from a side part of the lower magnetic flux collecting flange, where a distance between the upper magnetic flux collecting ring and the lower magnetic flux collecting ring and the distance between the upper magnetic flux collecting flange and the lower magnetic flux collecting flange are longer than the distance between the upper magnetic collecting terminal and the lower magnetic collecting terminal; and a magnetic detection sensor part located between the upper magnetic collecting terminal and the lower magnetic collecting terminal to detect an intensity of a magnetic flux, wherein the magnetic detection part has the upper magnetic collecting flange to extend from the upper end of the upper magnetic flux collecting ring and the lower magnetic collecting flange to extend from the lower end of the lower magnetic flux collecting ring, and the upper magnetic collecting terminal extends downwardly from the upper magnetic flux collecting flange, passes through the lower end of the upper magnetic flux collecting ring and is bent and extends radially and the lower magnetic collecting terminal extends upwardly from the lower magnetic flux collecting flange, passes through the upper end of the lower magnetic flux collecting ring and is bent and extends radially to correspond to the upper magnetic collecting terminal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A contactless torque sensor for a steering system, which is installed between an input shaft connected to a steering wheel and an output shaft connected to a vehicle wheel to detect a twist generated by rotational operation of the steering wheel, comprising:
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a magnetic force generating part coupled to the input shaft and having a plurality of N pole magnets and S pole magnets disposed alternatively on an upper and an lower outer circumferential surface thereof respectively and having the opposite poles between neighboring upper and lower magnets; a magnetic shield part coupled to the outer shaft and having a magnetic shield ring as a single hollow cylinder disposed at an radially outer side of the magnetic force generating part, the magnetic shield ring having a plurality of through holes each of which has a size to accommodate one upper magnet and one lower magnet therein and which are disposed in a circumferential direction at an interval therebetween to be the same as that between one of the upper magnets and the lower magnets; a magnetic detection part including an upper magnetic collecting member which has an upper magnetic flux collecting ring collecting a magnetic flux that passes through the upper shield surface, an upper magnetic flux collecting flange extending radially from an upper end of the upper magnetic flux collecting ring to a predetermined width and an upper magnetic collecting terminal bent from a side part of the upper magnetic flux collecting flange, and a lower magnetic collecting member which has a lower magnetic flux collecting ring collecting a magnetic flux that passes through the lower shield surface, a lower magnetic flux collecting flange extending radially from a lower end of the lower magnetic flux collecting ring to a predetermined width and a lower magnetic collecting terminal bent from a side part of the lower magnetic flux collecting flange, where a distance between the upper magnetic flux collecting ring and the lower magnetic flux collecting ring and the distance between the upper magnetic flux collecting flange and the lower magnetic flux collecting flange are longer than the distance between the upper magnetic collecting terminal and the lower magnetic collecting terminal; and a magnetic detection sensor part located between the upper magnetic collecting terminal and the lower magnetic collecting terminal to detect an intensity of a magnetic flux. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification