KR20160029990A - Torque sensor unit - Google Patents

Torque sensor unit Download PDF

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Publication number
KR20160029990A
KR20160029990A KR1020140119321A KR20140119321A KR20160029990A KR 20160029990 A KR20160029990 A KR 20160029990A KR 1020140119321 A KR1020140119321 A KR 1020140119321A KR 20140119321 A KR20140119321 A KR 20140119321A KR 20160029990 A KR20160029990 A KR 20160029990A
Authority
KR
South Korea
Prior art keywords
collector
output shaft
input shaft
torque sensor
picking
Prior art date
Application number
KR1020140119321A
Other languages
Korean (ko)
Inventor
전창남
Original Assignee
대성전기공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대성전기공업 주식회사 filed Critical 대성전기공업 주식회사
Priority to KR1020140119321A priority Critical patent/KR20160029990A/en
Priority to EP15838226.7A priority patent/EP3190029A1/en
Priority to US15/508,622 priority patent/US10094722B2/en
Priority to PCT/KR2015/009341 priority patent/WO2016036185A1/en
Priority to JP2017512393A priority patent/JP2017527803A/en
Priority to CN201580047872.6A priority patent/CN106794871B/en
Publication of KR20160029990A publication Critical patent/KR20160029990A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
    • B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/104—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving permanent magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/30—Sensors
    • B60Y2400/307—Torque sensors

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

A torque sensor of the present invention is disposed between an input shaft and an output shaft and senses a torque between an input shaft and an output shaft through a relative rotational displacement between an input shaft and an output shaft. The torque sensor device includes an input shaft and an output shaft, A housing capable of rotating relative to an input shaft and an output shaft: a magnet unit connected to one end of an input shaft and an output shaft, and including a magnet ring accommodated in the housing so as to be rotatable within the housing; A collector unit connected to one end of the other of the input shaft and the output shaft so as to be rotatable in the housing and to form a magnetic circuit with the magnet unit; And a sensing unit disposed on an outer circumferential side of the collector unit and sensing a magnetic field focused through the collector unit, wherein the collector unit includes: a lower collector arranged to be rotatable with respect to the magnet ring, And a picking collector which is disposed at a position spaced apart from the lower collector and on which the torque sensor is disposed and fixed to the housing, the lower collector having: an input shaft and an output shaft, And a plurality of lower collector teeth extending from the ends of the lower collector ring, wherein the lower collector tines are formed in a radial direction of the other of the input shaft and the output shaft And a torque sensor device.

Description

TORQUE SENSOR UNIT

The present invention relates to a torque sensor, and more particularly, to a torque sensor for sensing an applied torque to a shaft having an input shaft and an output shaft.

Generally, as the steering steering wheel is rotated when the vehicle is running or stopped, the wheel in contact with the road surface also rotates. That is, when the steering wheel is rotated leftward or rightward, the wheel rotates in the same direction. Since the wheel is in contact with the road surface, the steering ratio between the steering steering wheel and the wheel is different from each other due to the friction between the wheel and the road surface, so that the driver needs a large force to operate the steering steering wheel. .

A power steering system (PS) is provided as a device for assisting the steering force, and an EPS system using an electric motor among power steering systems is expanding its application range in passenger vehicles used in real life.

In order to assist the power assist in such a power steering system, a torque sensor for measuring the rotational angle deviation between the input shaft side connected to the steering steering wheel and the output shaft side interlocked with the wheel side Respectively.

The torque sensor is largely classified into a contact type and a non-contact type. Recently, a non-contact type torque sensor is adopted as a contact type due to a problem of reduction in noise and durability. The non-contact type torque sensor is classified into a magnetoresistance detection method, a magnetostriction detection method, a capacitance detection method, and an optical detection method.

On the other hand, in the conventional torque sensor of the magnetic resistance detection system provided in the electric power steering apparatus, the steering steering wheel to be operated by the driver is coupled to the upper end of the input shaft, and the lower end of the input shaft is connected to a torsion bar bar to the top of the output shaft. The lower end of the output shaft is connected to a wheel, and the lower end of the input shaft including the torsion bar and the upper end of the output shaft are protected by a housing on the outside thereof. In addition, the above-mentioned torque sensor and power means are installed inside the housing. Here, the input shaft is provided with a permanent magnet having a polarity crossing at a constant interval. A detection ring of the gear structure corresponding to the number of poles of the permanent magnet is provided on the output shaft as a ferromagnetic substance which can be magnetically induced by the permanent magnet provided on the input shaft. The detection ring is connected to a sensor for detecting magnetism. At this time, a change in the area corresponding to each other is caused by the relative torsion between the permanent magnet installed on the input shaft and the detection ring of the gear structure provided on the output shaft. Therefore, a change in the magnetic force is generated in the detection ring, and the sensor detects the change in the magnetic force, so that the output shaft senses the angle at which the twist occurs with respect to the input shaft.

However, the non-contact type torque sensor according to the related art has a problem that the malfunction is increased, the manufacturing cost is increased, and the durability problem due to the excessive component is exposed because the components are excessive and the assembly is complicated.

In addition, in the case of the prior art, the permanent magnet and the corresponding two toe rings are staggered to each other to increase leakage flux.

SUMMARY OF THE INVENTION An object of the present invention is to provide a torque sensor which can be manufactured with a simple structure, increases sensitivity, increases sensing reliability, and reduces manufacturing cost.

In order to achieve the above object, a torque sensor according to the present invention is disposed between an input shaft and an output shaft and detects a torque between an input shaft and an output shaft through a relative rotational displacement between an input shaft and an output shaft. And a magnet ring which is connected to one end of the input shaft and the output shaft and is accommodated in the housing so as to be rotatable inside the housing, Unit; A collector unit connected to one end of the other of the input shaft and the output shaft so as to be rotatable in the housing and to form a magnetic circuit with the magnet unit; And a sensing unit disposed on an outer circumferential side of the collector unit and sensing a magnetic field focused through the collector unit, wherein the collector unit includes: a lower collector arranged to be rotatable with respect to the magnet ring, And a picking collector which is disposed at a position spaced apart from the lower collector and on which the torque sensor is disposed and fixed to the housing, the lower collector having: an input shaft and an output shaft, And a plurality of lower collector teeth extending from the ends of the lower collector ring, wherein the lower collector tines are formed in a radial direction of the other of the input shaft and the output shaft And a torque sensor device.

In the torque sensor device, the picking collector includes: a lower picking collector spaced apart from the lower collector ring; and an upper picking collector disposed opposite to at least a portion of the lower collector tooth with the magnet ring interposed therebetween You may.

In the torque sensor device, the upper-polishing collector includes: an arc-shaped upper-polishing plate arranged opposite to at least a part of the lower collector teeth; and an upper-polishing terminal extending from an end of the upper- The picking collector includes: an arcuate lowering plate disposed opposite at least a portion of the lower collector ring; and a lower picking terminal extending from an end of the lower picking plate, wherein the torque sensor is coupled to the upper picking terminal, And may be disposed between the picking terminals.

In the torque sensor device, the radial length of the lower fixing plate and the upper fixing plate may be longer than the upper fixing plate.

The torque sensor device according to the present invention having the above-described configuration has the following effects.

First, the torque sensor device of the present invention has a structure in which the collector of the collector unit is vertically arranged, the leakage amount of the magnetic flux is minimized through each collector, the torque amount transmitted to the torque sensor is increased, Device can be provided.

Secondly, the torque sensor device of the present invention has a structure in which the performance is improved or maintained through a single lower collector arrangement structure, but the material consumption is remarkably reduced to simplify the product manufacturing process and significantly reduce the manufacturing cost. Can be provided.

1 is a schematic exploded perspective view of a torque sensor device according to an embodiment of the present invention.
2 is another partial exploded perspective view of a torque sensor device according to an embodiment of the present invention.
3 is a partial state view of a torque sensor device according to an embodiment of the present invention.

Hereinafter, the configuration and operation of the torque sensor device 10 of the present invention will be described with reference to the accompanying drawings.

The torque sensor device 10 of the present invention includes a housing 100, a magnet unit 200, a collector unit 300 and a sensing unit 400. The torque sensor device 10 of the present invention includes an input shaft 2, And the output shaft 3 to sense the torque between the input shaft 2 and the output shaft 3 through the relative rotational displacement of the input shaft 2 and the output shaft 3.

The housing 100 accommodates the end portions of the input shaft 2 and the output shaft 3 and is positionally fixed and movable relative to the input shaft 2 and the output shaft 3.

The housing 100 includes a housing cover 110 and a housing base 120. The housing cover 110 is fastened to the housing base 120 to form an interior space for receiving other components.

The housing cover 110 is disposed on the input shaft side and the housing base 120 is disposed on the output shaft 3 side facing the housing cover 110. A housing cover mounting portion (not shown) is provided on the outer periphery of the housing cover 110, and a housing base mounting portion (not shown) is disposed on the outer periphery of the housing base 120 to form a structure in which they are engaged with each other.

The housing cover 110 and the housing base 120 each have a housing cover through-hole 113 and a housing base through-hole (not shown) respectively at the center thereof to receive the input shaft 2 and the output shaft 3, So that the torsion bar 5, which directly connects the output shaft 3, can be arranged to be inserted therethrough.

The magnet unit 200 includes a magnet ring 220 connected to one end of the input shaft 2 and the output shaft 3 and rotatably received in the housing 100.

That is, the magnet unit 200 is connected to either the input shaft or the output shaft, that is, to the input shaft 2 side in the present embodiment and rotates together with the input shaft 2, so that the magnet unit 200 is accommodated in the housing 100 so as to be rotatable relative to the housing 100 .

The magnet unit 200 may have various configurations. However, in this embodiment, the magnet unit 200 includes the magnet ring 220.

Although not shown in this embodiment, the magnet unit may further include a magnet holder so that the magnet holder supports the magnet ring 220 on the input shaft side. The magnet ring 220 of the present invention has a structure in which N, S, S, and N poles are arranged or magnetized so as to form a magnetic field in the longitudinal direction of the input shaft 2 and the output shaft 3 .

A plurality of magnet rings may be provided, but one magnet ring is provided in this embodiment. The magnet ring 220 has N poles and S poles alternately disposed in the circumferential direction. The magnet ring 220 is magnetized to form a magnetic field in the longitudinal direction of the input shaft and the output shaft.

At least a part of the collector unit 300 is fixedly mounted on the other of the input shaft and the output shaft side, that is, on the output shaft 3 side in this embodiment, and is accommodated so as to be rotatable relative to the housing 100.

At least a part of the collector unit 300 is disposed outside the magnet ring 220 in the radial direction of the input shaft 3 and the output shaft 4 so that the magnetic field generated by the magnet ring 220 of the magnet unit 200 And transmits the signal to the sensor unit 400 which forms a magnetic path or focuses the magnetic field, thereby realizing a more accurate sensing function.

The sensing unit 400 is implemented as a torque sensor that is disposed on the outer circumferential side of the collector unit 300 and senses a magnetic field to be focused through the collector unit 300. The sensing unit may further include a separate sensor as the case may be.

In this embodiment, the sensing unit is implemented by one torque sensor, but it may include two torque sensors depending on the case, thereby improving the sensitivity accuracy and implementing a fail-safe function by outputting other signals in any one of failures .

Meanwhile, the collector unit 300 of the present invention includes a lower collector 320 and a picking collector 330.

The lower collector 320 is connected to the output shaft side and rotates together with the output shaft.

A lower collector sleeve (not shown) and a lower collector holder (not shown) may be further provided between the lower collector 320 and the output shaft 3. The lower collector sleeve is connected to the output shaft 3 at one end. The connection between the lower collector sleeve and the output shaft 3 can be variously combined to prevent relative rotation between welding, plastic snap fit, and caulking. Do.

Further, the lower collector sleeve may be a steel structure or a synthetic resin structure, and various modifications are possible according to design specifications.

Further, a lower collector holder is connected to the outer periphery of the lower collector sleeve. The lower collector holder is a component for connecting the lower collector sleeve to the lower collector and ultimately implements a coupling function to prevent relative rotation between the input shaft and the lower collector 320.

The lower collector 320 may be made of a magnetic material such as permalloy, a silicon steel plate, a steel plate, and the like. The material and manufacturing method may be variously modified within a predetermined structure, such as being pressed or cast.

The lower collector 320 includes a lower collector ring 321 and a lower collector column 323.

The lower collector ring 321 has a predetermined ring shape formed and arranged in the rotating direction of the output shaft 3. A plurality of lower collector teeth 323 are formed and spaced along the circumference from the end of the lower collector ring 321 in the inner radial direction on a plane perpendicular to the output shaft 3.

The picking collector 330 is positioned and fixed to the housing 100 by being spaced apart from the outer periphery of the upper collector 310 and the lower collector 320 and each end of the picking collector 330 is disposed with the torque sensor 400 interposed therebetween.

The picking collector 330 includes an upper picking collector 340 and a lower picking collector 350.

The upper picking collector 340 includes an upper picking plate 341 and an upper picking terminal 343.

The upper fixing plate 341 is disposed on the outer periphery side of the upper collector 310 in an arc and the upper fixing terminal 343 is disposed toward the torque sensor 400 on the outer periphery of the upper fixing plate 341. The upper fixing plate 341 is formed so as to overlap the upper side of the upper ring plate 341 with respect to the magnet ring 220 when viewed on a plane perpendicular to the input shaft and the output shaft, The magnet ring 220 may have a larger value than the gap between the inner and outer diameters so as to minimize magnetic flux leakage from the magnet ring 220.

The upper fixing terminal 343 is disposed toward the torque sensor 400 on the outer periphery of the upper fixing plate 341. The upper picking terminal 343 is provided with a predetermined bending shape so that the end portion thereof is brought close to the torque sensor 400 to reduce the air gap, thereby increasing the transfer of the magnetic flux to the torque sensor 400 side, .

The upper fixing plate 341 and the upper fixing terminal 343 are integrally formed. One end of the upper fixing plate 341 is disposed close to the magnet ring 220 and an end of the upper fixing terminal 343 is disposed close to the torque sensor 400 on the opposite side of the upper collector 310.

The lower picking collector 350 includes a lower picking plate 351 and a lower picking terminal 353. The overall structure is the same as that of the above-described upper picking collector 340, but may take a somewhat different configuration depending on the case.

The lower fixing plate 351 is disposed on the outer periphery of the lower collector 310 in an arc shape and the lower fixing plate 351 is lowered when viewed on a plane perpendicular to the input shaft and the output shaft. The distance between the inner and outer sides of the lower picking plate 351 is preferably larger than the interval between the inner diameter and the outer diameter of the lower collector ring 321, It is possible to adopt a configuration that minimizes flux leakage from the ring.

The lowering terminal 353 is disposed toward the torque sensor 400 on the outer periphery of the lower fixing plate 351. The lowering terminal 353 has a predetermined bending shape so that the end portion thereof is brought close to the torque sensor 400 to reduce the air gap, thereby increasing the magnetic flux attracted to the torque sensor 400 side for more accurate detection .

The lower fixing plate 351 and the lower fixing terminal 353 are integrally formed. One end of the lower picking plate 351 is arranged close to the lower collector 310 and an end of the lower picking terminal 353 is arranged close to the torque sensor 400 on the opposite side of the lower collector 310.

The upper and lower picking collector plates and the lower picking collector plates may have different lengths in the radial direction and may have a structure in which the length of the upper fixing plate is longer.

A feature of the present invention is a single magnet ring, a corresponding one lower collector, and a fixing structure of a fixed collector structure. The present invention can reduce the cost and maintain or improve the torque sensing performance.

Also, in the case of the magnet ring magnetized in the axial direction, when there is no twist torsion between the input shaft and the output shaft, the N pole and S pole of the magnetic flux collected by the lower collector are arranged at 50:50 to form a magnetically neutral state Reference).

On the other hand, when there is a torsional torsion between the input shaft and the output shaft, the N pole and S pole of the magnetic flux collected by the lower collector are out of balance of 50:50 and form an unequal state. A magnetic field proportional to the change in the area is induced through the picking collector to form a magnetic path for returning to the upper portion of the magnet ring 220. At this time, the torque sensor detects a change in the magnetic field, It is possible to detect the amount of twist torsion generated.

As described above, according to the present invention, the torque applied to the shaft can be variously changed within a range of sensing through a non-contact type method.

100 ... housing 110 ... housing cover
120 ... housing base 200 ... magnet unit
300 ... collector unit 400 ... sensing unit

Claims (4)

A torque sensor device disposed between an input shaft and an output shaft for sensing a torque between an input shaft and an output shaft through relative rotational displacement between an input shaft and an output shaft,
A housing rotatable relative to the input shaft and the output shaft, the housing being adapted to receive an end of the input shaft and the output shaft,
A magnet unit connected to one end of an input shaft and an output shaft and including a magnet ring accommodated in the housing so as to be rotatable within the housing;
A collector unit connected to one end of the other of the input shaft and the output shaft so as to be rotatable in the housing and to form a magnetic circuit with the magnet unit;
And a torque sensor disposed on an outer circumferential side of the collector unit and sensing a magnetic field focused through the collector unit,
The collector unit comprises:
A lower collector disposed so as to be rotatable in opposition to the magnet ring,
And a picking collector disposed on the lower collector and spaced apart from the lower collector, the torque sensor disposed at an end of the lower collector and fixed to the housing,
The lower collector includes:
A ring-shaped lower collector ring disposed at one end of the other of the input shaft and the output shaft on a radially outer periphery,
And a plurality of lower collector teeth spaced apart from ends of the lower collector ring,
Wherein the lower collectors tooth is formed in the radial direction of the other one of the input shaft and the output shaft. The method according to claim 1,
The picking collector comprises:
A lower picking collector spaced apart from the lower collector ring,
And an upper-polishing collector disposed opposite to at least a part of the lower collector tooth with the magnet ring interposed therebetween. 3. The method of claim 2,
The upper-picking collector includes:
An upper-side upper-polishing plate disposed opposite to at least a part of the lower collector teeth,
And an upper fixing terminal extending from an end of the upper fixing plate,
The lower picking collector comprises:
An upper downwardly-raking plate disposed opposite at least a portion of the lower collector ring,
And a lower picking terminal extending from an end of the lower picking plate,
Wherein the torque sensor is disposed between the upper picking terminal and the lower picking terminal. The method of claim 3,
Wherein the radial direction length of the lower fixing plate and the upper fixing plate is longer than the upper fixing plate.

KR1020140119321A 2014-09-05 2014-09-05 Torque sensor unit KR20160029990A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1020140119321A KR20160029990A (en) 2014-09-05 2014-09-05 Torque sensor unit
EP15838226.7A EP3190029A1 (en) 2014-09-05 2015-09-04 Torque sensor device
US15/508,622 US10094722B2 (en) 2014-09-05 2015-09-04 Torque sensor device
PCT/KR2015/009341 WO2016036185A1 (en) 2014-09-05 2015-09-04 Torque sensor device
JP2017512393A JP2017527803A (en) 2014-09-05 2015-09-04 Torque sensor device
CN201580047872.6A CN106794871B (en) 2014-09-05 2015-09-04 Torque sensor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140119321A KR20160029990A (en) 2014-09-05 2014-09-05 Torque sensor unit

Publications (1)

Publication Number Publication Date
KR20160029990A true KR20160029990A (en) 2016-03-16

Family

ID=55649798

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020140119321A KR20160029990A (en) 2014-09-05 2014-09-05 Torque sensor unit

Country Status (1)

Country Link
KR (1) KR20160029990A (en)

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