KR20120133404A - Torque angle sensor - Google Patents

Torque angle sensor Download PDF

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Publication number
KR20120133404A
KR20120133404A KR1020110052007A KR20110052007A KR20120133404A KR 20120133404 A KR20120133404 A KR 20120133404A KR 1020110052007 A KR1020110052007 A KR 1020110052007A KR 20110052007 A KR20110052007 A KR 20110052007A KR 20120133404 A KR20120133404 A KR 20120133404A
Authority
KR
South Korea
Prior art keywords
magnet
angle sensor
hall element
torque angle
holder
Prior art date
Application number
KR1020110052007A
Other languages
Korean (ko)
Inventor
우명철
Original Assignee
엘지이노텍 주식회사
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Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020110052007A priority Critical patent/KR20120133404A/en
Publication of KR20120133404A publication Critical patent/KR20120133404A/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
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Power Steering Mechanism (AREA)

Abstract

PURPOSE: A torque angle sensor is provided to regularly maintain magnetic flux being transferred to a hall element because a magnet can maintain a constant distance from a hall element even though a sub gear is shaken. CONSTITUTION: A torque angle sensor comprises upper and lower cases(10,30), a stator(60), a main gear(41), a middle case(20), sub-gears(42,43), a magnet holder, and a hall element(48). The stator is installed in the inside of the upper and lower cases, thereby being connected to an output shaft and a rotor(50) being connected to an input unit. The main gear is joined to the lower part of the stator. The middle case is interposed between the upper and lower cases. The sub-gears are joined to be the middle case to be rotatable and engaged with the main gear. The magnet holder is respectively installed in the sub-gears and coaxially joined to the rotary shafts of the sub-gears. The magnet is fixed to a center of the magnet holder.

Description

Torque angle sensor {TORQUE ANGLE SENSOR}

The present invention relates to a torque angle sensor, and more particularly, to a torque angle sensor having a structure capable of preventing the flow of a magnet mounted to the subgear constituting the angle sensor.

In general, a steering device assisted by a separate power is used as a device to ensure the stability of steering of the vehicle. Conventionally, such an auxiliary steering device is used as a device using hydraulic pressure, but recently, an electric power steering system (Electronic Power Steering System) having low power loss and excellent accuracy is used.

The electric steering apparatus (EPS) as described above drives the motor in the electronic control unit according to the driving conditions detected by the vehicle speed sensor, the torque angle sensor, the torque sensor, etc., thereby ensuring turning stability and providing fast resilience. To allow safe driving.

Torque angle sensor (Torque Angle Sensor) is a device that detects the torque applied to the steering shaft and outputs an electrical signal proportional to the detected torque, and outputs an electrical signal proportional to the rotation angle of the steering shaft. 1 is an exploded perspective view illustrating such a conventional torque angle sensor, and FIG. 2 is a cross-sectional view illustrating a coupling relationship between a subgear and a magnet as a main part of FIG. 1.

Torque angle sensor from the top of the upper case 10, the rotor 50 and the stator 60, the middle case 20, the main gear 41, the first sub gear 42 and the second sub gear 43, It is composed of a printed circuit board 40 and the lower case (30).

The rotor 50 and the stator 60, which serve as sensing parts of the torque sensor unit, are disposed on the upper side of the middle case 20, and the main gear 41 and the subgear 42, which serve as angle sensor units, are disposed below. 43 is disposed.

In the case of the torque sensor, a magnet is disposed along the outer circumferential surface of the rotor 50, and a stator having a protruding piece corresponding to the polarity of the magnet is disposed on the outer circumferential surface of the torque sensor, thereby detecting the magnetic amount according to the difference in the mutual rotational amount and torque of the input shaft and the output shaft. Is detected and transmitted to the electronic controller.

In the case of the angle sensor, as the driver rotates the steering wheel, the main gear 41 attached to the steering shaft rotates in association with each other, and a difference in rotation angle occurs. At this time, the sub gear 42 engaged with the main gear 41 is engaged. The Hall IC 48 recognizes the magnetic field and rotation direction of the magnets 44 and 45 attached to the 43 to transfer the signal to the electronic controller.

However, since the conventional magnets 44 and 45 are attached to and coupled to the subgear 42 and 43, when the sub-gear 42 and 43 are shaken, the distance g from the hole element 48 is g. ) May not remain constant. As such, when the distance between the magnets 44 and 45 and the hole element 48 is not kept constant, the magnetic flux of the magnets 44 and 45 is constantly transmitted to the hall element 48. There is a problem that the measured value of the torque angle sensor may be inaccurate.

Accordingly, the present invention has been made to solve the above problems, by improving the coupling structure of the magnet and the sub-gear constituting the angle sensor unit, the magnet can rotate in the correct position during the rotation of the sub-gear, a constant distance from the Hall element It is an object of the present invention to provide a torque angle sensor having an improved structure to maintain the same.

Torque angle sensor according to the present invention, the torque angle sensor disposed between the steering input shaft and the output shaft, the upper and lower cases; Installed inside the upper and lower cases, a rotor connected to the input shaft and a stator connected to the output shaft; A ring-shaped main gear coupled to the lower side of the stator; A middle case interposed between the upper and lower cases; At least two subgear rotatably coupled to the middle case and engaged with the main gear; A magnet holder installed at each of the subgear gears, the magnet holder being coaxially coupled with the rotational shaft of the subgear gear; A magnet fixed to the center of the magnet holder; And a hall element installed at a position corresponding to the magnet of the lower case.

According to an embodiment of the present invention, the subgear may have a holder seating groove into which the magnet holder is inserted and coupled.

The magnet holder may include: a first cylinder part which is injection molded together with the magnet and has a shape corresponding to the holder seating groove; And a second tube portion whose tip is in contact with a printed circuit board disposed on an inner surface of the lower case in which the hall element is installed.

The first tube portion is preferably formed to have the same thickness as that of the magnet, so that the distance between the first tube portion and the Hall element is the same as the distance between the magnet and the Hall element.

Preferably, the second tube portion has a space portion formed therein so as to contact the printed circuit board with a minimum area, and a tip portion forming the thickness of the second tube portion forms a contact surface.

The magnet is preferably fixed to the center of the first cylinder portion, it is preferable that an annular departure prevention rib protrudingly formed around the magnet to prevent the departure from the first cylinder portion.

According to the present invention as described above, since the magnet is fixed to the magnet holder that maintains a constant distance with respect to the Hall element, even if the sub-gear swings, the magnet can always be kept at a constant distance from the Hall element, so that it is transmitted to the Hall element. The magnetic flux can be kept constant.

1 is an exploded perspective view showing a torque angle sensor according to the prior art;
FIG. 2 is a cross-sectional view illustrating a magnet coupled to a subgear as a main part of FIG. 1;
3 is an exploded perspective view illustrating a state in which a magnet is coupled to a sub gear according to an embodiment of the present invention by a magnet holder, and
4 is a cross-sectional view of FIG. 3.

Hereinafter, a torque angle sensor according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

The rotor constituting the torque sensor portion of the torque angle sensor is connected to receive a steering input of the input shaft, and the stator is connected to the output shaft. The input shaft is rotated by the force of rotating the steering wheel of the driver. The output shaft is connected to the front wheel of the vehicle and rotates by receiving a force from the input shaft.

The torque sensor unit is composed of a rotor magnet and teeth. The rotor magnet is formed in a ring shape on the outer circumferential surface of the rotor, and the teeth are formed on the stator, and are spaced apart on the outer circumferential side of the rotor magnet to sense a magnetic field according to the relative rotation of the rotor magnet.

The angle sensor unit includes a ring-shaped main gear that rotates together with the stator, and a magnet coupled to a plurality of subgear connected to the main gear. The magnetic field change of the magnets is sensed by Hall ICs installed at positions corresponding to the installation positions of the magnets on the printed circuit board.

3 is an exploded perspective view illustrating a coupling structure of a subgear and a magnet according to an exemplary embodiment of the present invention, and FIG. 4 is a cross-sectional view of FIG. In understanding the structure of the present invention, components that perform the same construction and operation as the prior art will be described with reference to the same reference numerals for ease of understanding. For reference, since the feature of the present invention lies in the connection structure between the subgear and the magnet, redundant description of the same configuration as in the prior art is omitted.

The basic configuration of the torque angle sensor according to the present invention is the same as that of the prior art shown in FIG. That is, in the case forming the appearance of the torque angle sensor, as shown in Figure 1, the upper case 10, the middle case 20 and the lower case 30 is arranged from the top. The upper case 10, the middle case 20 and the lower case 30 are coupled to each other to form a receiving space so that the components for detecting torque or angle can be disposed therein.

The rotor 50 and the stator 60 are disposed just below the upper case 10. The rotor 50 is connected to the input shaft to rotate together, the rotor magnet is disposed on the outer peripheral surface.

In addition, the stator 60 is connected to the output shaft and rotated together, and a predetermined tooth is formed to face each magnet so as to sense a change in the magnetic force of the magnet disposed on the outer circumferential surface of the rotor 50.

When the torsion bar is torsioned according to the load difference between the input shaft and the output shaft, a difference in rotation between the rotor 50 and the stator 60 is generated, which is detected as a change in magnetic force and is applied to the printed circuit board 400. It is detected by a connected Hall element.

The printed circuit board 49 is provided with a hall element 48 and a microcontroller to electrically process a signal. That is, the microcontroller measures torque by comparing a signal sensed by the Hall element with a preset value.

The main gear 41 and the sub-gear 420 configured as shown in FIGS. 3 and 4 are disposed below the stator 60 to detect rotation angle information. The main gear 411 is connected to rotate with the output shaft, the subgear 420 has a gear ratio different from the main gear 41 and has teeth that are engaged with each other.

On the other hand, two sub-gear 420 is generally arranged in order to implement an effective difference in rotation amount, one or three or more may be arranged, of course. In a preferred embodiment of the present invention, two subgear 420 are provided, and only one of the subgear 420 is shown in the side cross-sectional view of FIG.

The magnet 440 coupled to the subgear 420 transfers the magnetic flux to the hole element 48 disposed at the lower side facing each other, so that the hole element 48 rotates and rotates the subgear 420. Detect speed

On the other hand, the lower case 30 is disposed on the lower side of the configuration, by combining the upper case 10 and the side while supporting the configuration to form the appearance of the torque angle sensor.

In the torque angle sensor having such a configuration, the present invention is characterized in that the improved structure of the coupling structure of the subgear 420 and the magnet 440.

That is, according to an exemplary embodiment of the present invention, the subgear 420 and the magnet 440 are interposed between the magnet holder 400 and the magnet 440 regardless of the flow of the subgear 420. May maintain a constant distance from the Hall element 48.

To this end, the subgear 420 preferably has a holder seating groove 421 into which the magnet holder 400 is inserted.

The holder seating groove 421 is preferably provided in a shape corresponding to the magnet holder 400, in general, the sub-gear 420 is provided in a cylindrical shape, because the holder seating groove ( 421 and the magnet holder 400 is also preferably provided in a cylindrical shape. Of course, it may be provided in a rectangular or other various shapes, if necessary, in consideration of manufacturing convenience, it is reasonable to provide a cylindrical shape.

The magnet holder 400 is provided in a shape in which the holder seating groove 421 corresponds, and preferably, the first holder 401 and the second holder 402. The magnet 440 is installed inside the first cylinder portion 401, the end of the second cylinder portion 402 is disposed on the inner surface of the lower case 30, and the hall element 48 is installed. It is desirable to be in contact with the printed circuit board 49.

On the other hand, the first tube portion 401 is formed to have a thickness equal to the thickness of the magnet 440, the distance between the first tube portion 401 and the hole element 48 is the magnet 440 and the hole It is preferably formed to be equal to the distance of the element 48.

The second tube portion 402 has a space portion formed therein so as to contact the printed circuit board 49 with a minimum area, and the tip portion forming the thickness of the second tube portion 402 forms a contact surface. good.

On the other hand, the magnet holder 400 is preferably injection-molded with a nonmagnetic material such as plastic, preferably, the magnet 440 is disposed in the installation position, it is preferable that the injection molding together with the magnet 440.

The magnet 440 is preferably fixed to the center of the first cylinder portion 401, the annular departure prevention ribs (circumference of the magnet 440) to prevent the departure from the first cylinder portion 401 ( 441 is preferably formed to protrude.

On the other hand, the magnet 440 may be fixed to the first cylindrical portion 401 by using an adhesive, it is also possible to be fixed fixed to the separation prevention rib 441.

According to the present invention as described above, since the tip portion of the second cylindrical portion 402 of the magnet holder 400 is always in contact with the printed circuit board 49 on which the hall element 48 is mounted, The distance between the magnet 440 and the hall element 48 may be kept constant. Therefore, the magnetic flux of the magnet 440 may be constantly transmitted to the Hall element 48, thereby improving the reliability of the torque angle sensor.

In the foregoing, the present invention has been described in detail based on the embodiments and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

10; Upper case 20; Middle case
30; Lower case 40; Printed circuit board
48; Hall element 400; Magnet holder
401; First tube portion 402; The second tube
420; First subgear 421; Holder mounting groove
440; Magnet 441; Breakaway Ribs

Claims (7)

Torque angle sensor disposed between the steering input shaft and the output shaft,
Upper and lower cases;
Installed inside the upper and lower cases, a rotor connected to the input shaft and a stator connected to the output shaft;
A ring-shaped main gear coupled to the lower side of the stator;
A middle case interposed between the upper and lower cases;
At least two subgear rotatably coupled to the middle case and engaged with the main gear;
A magnet holder installed at each of the subgear gears, the magnet holder being coaxially coupled with the rotational shaft of the subgear gear;
A magnet fixed to the center of the magnet holder; And
And a Hall element installed at a position corresponding to the magnet of the lower case.
The method of claim 1, wherein the subgear,
Torque angle sensor characterized in that it has a holder seating groove to which the magnet holder is inserted coupling.
The method of claim 2, wherein the magnet holder,
Injection molded together with the magnet,
A first tube part provided in a shape corresponding to the holder seating groove; And
And a second tube portion whose end is in contact with a printed circuit board disposed on an inner side surface of the lower case in which the hall element is installed.
The method of claim 3, wherein the magnet is,
Torque angle sensor, characterized in that fixed to the center of the first cylinder.
The method of claim 4, wherein the magnet,
Torque angle sensor, characterized in that the annular departure preventing ribs protruded around the magnet so that the departure from the first cylinder portion is prevented.
The method of claim 3, wherein the first tube portion,
Torque angle sensor, characterized in that formed to have a thickness equal to the thickness of the magnet, the distance between the first tube portion and the Hall element is the same as the distance between the magnet and the Hall element.
The method of claim 3, wherein the second tube portion,
And a space portion is formed therein so as to contact the printed circuit board with a minimum area, and the tip portion forming the thickness of the second tube portion has a contact surface.
KR1020110052007A 2011-05-31 2011-05-31 Torque angle sensor KR20120133404A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110052007A KR20120133404A (en) 2011-05-31 2011-05-31 Torque angle sensor

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Application Number Priority Date Filing Date Title
KR1020110052007A KR20120133404A (en) 2011-05-31 2011-05-31 Torque angle sensor

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KR20120133404A true KR20120133404A (en) 2012-12-11

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015099339A1 (en) * 2013-12-26 2015-07-02 엘지이노텍 주식회사 Torque angle sensor
KR20190086149A (en) * 2018-01-12 2019-07-22 엘지이노텍 주식회사 Roating sensing apparatus
KR20190087821A (en) * 2018-01-17 2019-07-25 엘지이노텍 주식회사 Rotating sensing apparatus
KR20200010523A (en) * 2020-01-14 2020-01-30 엘지이노텍 주식회사 Torque and angle sensor
US20210086828A1 (en) * 2017-07-24 2021-03-25 Lg Innotek Co., Ltd. Torque sensor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015099339A1 (en) * 2013-12-26 2015-07-02 엘지이노텍 주식회사 Torque angle sensor
US10081388B2 (en) 2013-12-26 2018-09-25 Lg Innotek Co., Ltd. Torque sensor
US20210086828A1 (en) * 2017-07-24 2021-03-25 Lg Innotek Co., Ltd. Torque sensor
US11958555B2 (en) * 2017-07-24 2024-04-16 Lg Innotek Co., Ltd. Torque sensor
KR20190086149A (en) * 2018-01-12 2019-07-22 엘지이노텍 주식회사 Roating sensing apparatus
KR20190087821A (en) * 2018-01-17 2019-07-25 엘지이노텍 주식회사 Rotating sensing apparatus
KR20200010523A (en) * 2020-01-14 2020-01-30 엘지이노텍 주식회사 Torque and angle sensor

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