KR102500990B1 - Rotor, stator and sensing assembly having the same - Google Patents

Abstract

The embodiment includes a rotor including a magnet; a stator disposed outside the magnet; a main gear coupled to the stator; a sub gear engaged with the main gear; a circuit board disposed outside the stator; a collector disposed between the stator and the circuit board; a bracket disposed under the stator; and a housing accommodating the rotor, the stator, the main gear, the sub gear, the circuit board, the collector, and the bracket therein, wherein the rotor is disposed outside a rotor sleeve and an end of the rotor sleeve. A rotor holder and a magnet disposed outside the rotor holder, wherein the rotor holder includes a rotor holder body and a first protrusion protruding inward from an inner circumferential surface of the rotor holder body, and a first protrusion formed on the rotor sleeve It relates to a sensing assembly in which the first protrusion is disposed inside the hole.

Description

Rotor, stator and sensing assembly including the same

Embodiments relate to a rotor, a stator, and a sensing assembly including the same.

The power steering system (hereinafter referred to as 'EPS') drives the motor from the electronic control unit according to driving conditions to ensure turning stability and provides a quick restoring force, allowing the driver to drive safely. make this possible

The power steering system (EPS) drives a motor in an electronic control unit according to driving conditions detected by a vehicle speed sensor, a torque angle sensor, and a torque sensor to ensure turning stability and provide a quick restoring force to help the driver enable safe driving.

At this time, the EPS includes a sensing assembly that measures the torque and angle (steering angle of the steering wheel) of the steering shaft in order to provide an appropriate torque. Here, the steering shaft may include an input shaft connected to the handle and an output shaft connected to the power transmission component on the wheel side.

And, the sensing assembly measures the degree of torsion between the input shaft and the output shaft to measure the torque and angle applied to the steering shaft.

Meanwhile, the rotor disposed in the sensing assembly may include a rotor sleeve connected to the input shaft, a rotor holder disposed at an end side of the rotor sleeve, and a magnet disposed in the rotor holder. Here, the rotor holder may be formed of a synthetic resin material.

When the rotor sleeve rotates in conjunction with the input shaft, there is a problem in that slip occurs between the rotor sleeve and the rotor holder.

Furthermore, since the rotor holder may expand and contract due to a temperature difference between the sensing assembly and the surrounding environment, a gap may occur between the rotor sleeve and the rotor holder, resulting in increased slip.

In addition, the stator disposed in the sensing assembly may include a stator sleeve connected to the output shaft, a stator holder disposed at an end side of the stator sleeve, and a stator ring disposed in the stator holder. Here, the stator holder may be formed of a synthetic resin material.

When the stator sleeve rotates in conjunction with the output shaft, slip occurs between the stator sleeve and the stator holder.

Furthermore, since the stator holder may expand and contract due to a temperature difference of the sensing assembly due to the surrounding environment, a gap may occur between the stator sleeve and the stator holder, resulting in increased slip. Inventions related to this include Patent Publication No. 10-2018-0001411 (2018.01.04.) and Patent Publication No. 10-2015-0034984 (2015.04.06.).

Provided is a sensing assembly capable of preventing slip by improving coupling force between a sleeve and a holder of each rotor or stator.

The problems to be solved by the embodiments are not limited to the problems mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the description below.

According to the embodiment, the above task is a rotor sleeve; a rotor holder disposed outside an end of the rotor sleeve; And a magnet disposed outside the rotor holder, wherein the rotor holder includes a rotor holder body and a first protrusion protruding inward from an inner circumferential surface of the rotor holder body, and the inside of the first hole formed in the rotor sleeve This is achieved by a rotor on which the first protrusion is disposed.

The rotor sleeve may further include a groove formed at a lower end portion, the rotor holder may further include a key portion protruding inward from the rotor holder body, and the key portion may be disposed in the groove.

In addition, an end portion of the key portion formed on the rotor holder body based on the inner circumferential surface of the rotor sleeve body may protrude inward by a predetermined length L1.

Also, a width W1 of the key portion formed on the rotor holder body may be greater than a diameter D1 of the first protrusion.

The magnet may include a magnet body and a second protrusion protruding inward from the magnet body, and the second protrusion may be disposed inside a second hole formed in the rotor holder body.

Here, the outer circumferential surface of the rotor holder body may be spaced apart from the inner circumferential surface of the magnet body by a predetermined distance (G).

In addition, the magnet further includes a departure prevention protrusion formed on a side surface of the second protrusion, and when the rotor holder is disposed between the rotor sleeve and the magnet by an insert injection method, the departure prevention protrusion is the rotor holder main body. can be placed inside.

Meanwhile, the rotor sleeve and the rotor holder may be coupled by an insert injection method.

Preferably, when the rotor holder is disposed between the rotor sleeve and the magnet by an insert injection method, the first protrusion of the rotor holder may be formed inside the first hole.

In addition, the rotor holder and the magnet may be coupled by an insert injection method.

Preferably, when the rotor holder is disposed between the rotor sleeve and the magnet by an insert injection method, the second hole may be formed by the second protrusion.

The task is a stator sleeve; A stator holder disposed outside an end of the stator sleeve and a pair of stator rings disposed to cover a portion of an outer surface of the stator holder, wherein the stator holder extends inwardly from an inner circumferential surface of the stator holder body and the stator holder body. The stator includes a protruding third protrusion, and the third protrusion is disposed inside a third hole formed in the stator sleeve.

The stator sleeve may further include a groove formed at an upper end thereof, the stator holder may further include a key portion protruding inward from the stator holder body, and the key portion may be disposed in the groove.

Also, an end portion of the key portion formed on the stator holder body may protrude inward by a predetermined length L2 based on the inner circumferential surface of the stator sleeve.

Also, a width W2 of the key portion formed on the stator holder body may be larger than a diameter D2 of the third protrusion.

Meanwhile, when the stator holder is disposed at the end of the stator sleeve by an insert injection method, the third protrusion of the stator holder may be formed inside the third groove.

According to the embodiment, the problem is a rotor including a magnet; a stator disposed outside the magnet; a main gear coupled to the stator; a sub gear engaged with the main gear; a circuit board disposed outside the stator; a collector disposed between the stator and the circuit board; a bracket disposed under the stator; and a housing accommodating the rotor, the stator, the main gear, the sub gear, the circuit board, the collector, and the bracket therein, wherein the rotor is disposed outside a rotor sleeve and an end of the rotor sleeve. A rotor holder and a magnet disposed outside the rotor holder, wherein the rotor holder includes a rotor holder body and a first protrusion protruding inward from an inner circumferential surface of the rotor holder body, and a first protrusion formed on the rotor sleeve The inside of the hole is achieved by the sensing assembly in which the first protrusion is disposed.

Here, the stator may include a stator sleeve; a stator holder disposed outside an end of the stator sleeve; and a pair of stator rings disposed to cover a portion of an outer surface of the stator holder, wherein the stator holder includes a stator holder body and a third protrusion protruding inward from an inner circumferential surface of the stator holder body, the stator sleeve The third protrusion may be disposed inside the third hole formed in .

The rotor holder includes a key portion protruding inward from the rotor holder body, the stator holder includes a key portion protruding inward from the stator holder body, and the key portion of the rotor holder and the key portion of the stator holder It may be arranged on the same line based on the axial direction.

According to the embodiment, the problem is a rotor including a magnet; a stator disposed outside the magnet; a main gear coupled to the stator; a sub gear engaged with the main gear; a circuit board disposed outside the stator; a collector disposed between the stator and the circuit board; a bracket disposed under the stator; and a housing accommodating the rotor, the stator, the main gear, the sub gear, the circuit board, the collector, and the bracket therein, wherein the stator is disposed outside an end of a stator sleeve and an end of the stator sleeve. A stator holder and a pair of stator rings disposed to cover a portion of an outer surface of the stator holder, wherein the stator holder includes a stator holder body and a third protrusion protruding inward from an inner circumferential surface of the stator holder body, This is achieved by a sensing assembly in which the third protrusion is disposed inside the third hole formed in the stator sleeve.

The sensing assembly according to the embodiment having the configuration as described above may prevent the sleeve of the rotor or the stator from slipping through the coupling of the hole and the protrusion.

In addition, since the rotor holder of the sensing assembly and the magnet are spaced apart from each other by a predetermined interval G, even if the rotor holder expands or contracts according to the surrounding environment, damage to the magnet can be prevented by the interval G. .

In addition, the key portion of the rotor holder protruding based on the inner circumferential surface of the rotor sleeve body may be coupled to the input shaft.

In addition, the key portion of the stator holder protruding based on the inner circumferential surface of the stator sleeve may be coupled to the output shaft.

1 is a perspective view showing a sensing assembly according to an embodiment;
2 is an exploded perspective view showing a sensing assembly according to an embodiment;
3 is a perspective view showing a rotor of a sensing assembly according to an embodiment;
4 is an exploded perspective view showing a rotor of a sensing assembly according to an embodiment;
5 is a plan view illustrating a rotor of a sensing assembly according to an embodiment;
6 is a view showing a cross section taken along line AA of FIG. 5;
7 is a plan view illustrating a rotor holder of a rotor of a sensing assembly according to an embodiment;
8 is a perspective view illustrating a stator of a sensing assembly according to an embodiment;
9 is an exploded perspective view showing a stator of a sensing assembly according to an embodiment;
10 is a plan view illustrating a stator of a sensing assembly according to an embodiment;
11 is a view showing a cross section taken along line BB of FIG. 10;
12 is a bottom view illustrating a stator holder of a stator of a sensing assembly according to an embodiment.

Since the present invention can make various changes and have various embodiments, specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as second and first may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a second element may be termed a first element, and similarly, a first element may be termed a second element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

In the description of the embodiment, in the case where one component is described as being formed “on or under” another component, the upper (above) or lower (below) (on or under) includes both those formed by direct contact between two components or by indirectly placing one or more other components between the two components. In addition, when expressed as 'on or under', it may include the meaning of not only the upward direction but also the downward direction based on one component.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, it should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings, but the same or corresponding components regardless of reference numerals are given the same reference numerals, and overlapping descriptions thereof will be omitted.

The sensing assembly 1 according to the embodiment may be disposed between an input shaft (not shown) and an output shaft (not shown) of the steering shaft.

1 is a perspective view showing a sensing assembly according to an embodiment, and FIG. 2 is an exploded perspective view showing a sensing assembly according to an embodiment. Here, the x direction shown in FIGS. 1 and 2 means an axial direction, and the y direction means a radial direction. And, the axial direction and the radial direction are perpendicular to each other.

1 and 2, the sensing assembly 1 according to the embodiment is coupled to a housing 100, a rotor 200 connected to the input shaft, a stator 300 connected to the output shaft, and a stator 300. A main gear 400, a sub gear 500 meshing with the main gear 400, a circuit board 600 disposed outside the stator 300, and disposed between the stator 300 and the circuit board 600 A bracket 800 disposed under the collector 700 and the stator 300 may be included. Here, the inside means a direction toward the center C with respect to the center C, and the outside means a direction opposite to the inside.

Meanwhile, a sub-magnet may be disposed on the sub-gear 500, and a magnetic element for sensing magnetization of the sub-magnet may be disposed on the circuit board 600. Also, a sensor for measuring torque may be disposed on the circuit board 600 .

The housing 100 may form the outer shape of the sensing assembly 1 .

The housing 100 may include a first housing 110 and a second housing 120 coupled to each other to have an accommodation space therein. Here, the first housing 110 may be referred to as an upper housing, and the second housing 120 may be referred to as a lower housing.

A first through hole 111 through which the input shaft passes may be formed in the first housing 110, and a second through hole 121 through which an output shaft (not shown) passes through may be formed in the second housing 120. . Here, the input shaft may be connected to a steering wheel of the vehicle, and the output shaft may be connected to a steering wheel side.

Meanwhile, the rotor 200, the stator 300, the main gear 400, the sub gear 500, the circuit board 600, the collector 700, and the bracket 800 may be disposed in the accommodation space.

The rotor 200 is disposed inside the stator 300. The rotor 200 is connected to the input shaft of the steering shaft. Here, the input shaft may be a steering shaft connected to the steering wheel.

3 is a perspective view showing a rotor of a sensing assembly according to an embodiment, FIG. 4 is an exploded perspective view showing a rotor of a sensing assembly according to an embodiment, and FIG. 5 is a plan view showing a rotor of a sensing assembly according to an embodiment. 6 is a view showing a cross section along line A-A in FIG. 5 .

Referring to FIGS. 3 to 6 , the rotor 200 may include a rotor sleeve 210 , a rotor holder 220 and a magnet 230 .

The rotor sleeve 210 may include a rotor sleeve body 211 and a first hole 212 and a groove 213 formed in the rotor sleeve body 211 . Here, the groove 213 may be referred to as a rotor groove or a first groove.

The rotor sleeve body 211 may be formed in a cylindrical shape or a tubular shape. Also, the rotor sleeve body 211 may be formed of a metal material. At this time, the rotor sleeve body 211 may be coupled to the end of the input shaft.

The first hole 212 may be formed in a circular shape. The first hole 212 may be formed to penetrate the rotor sleeve body 211 in a radial direction. For example, one side of the first hole 212 may be disposed on the inner circumferential surface 211a of the rotor sleeve body 211 and the other side may be disposed on the outer circumferential surface 211b of the rotor sleeve body 211. In this case, a part of the rotor holder 220 may be disposed in the first hole 212 .

A plurality of first holes 212 may be formed. Here, the first holes 212 may be disposed in the rotor sleeve body 211 along the circumferential direction at predetermined intervals.

As shown in FIG. 4 , the groove 213 may be formed in an arch shape at the lower end of the rotor sleeve body 211 . Here, the shape of the groove 213 is formed in an arch shape as an example, but is not necessarily limited thereto. For example, the shape of the groove 213 may be formed in a shape corresponding to the shape of the vertical cross section of the key portion 223 of the rotor holder 220 .

At this time, the groove 213 may be formed by cutting a region of the lower end of the rotor sleeve body 211 .

A rotor holder 220 may be disposed on a lower side of the rotor sleeve 210 . Here, the rotor holder 220 may be formed of a synthetic resin such as resin. Accordingly, the rotor holder 220 may be disposed at the lower end of the rotor sleeve 210 by an insert injection method. Accordingly, a portion of the rotor holder 220 may be disposed in the first hole 212 and the groove 213 of the rotor sleeve 210 .

The rotor holder 220 is disposed between the rotor sleeve 210 and the magnet 230.

The rotor holder 220 includes a rotor holder body 221, a first protrusion 222 protruding inward in the radial direction from the inner circumferential surface 221a of the rotor holder body 221, and an inner circumferential surface of the rotor holder body 221 ( 221a) may include a key portion 223 protruding inward in the radial direction and a second hole 224 formed in the rotor holder body 221 . Here, the key part 223 of the rotor holder 220 may be called a first key part or a rotor key part.

The rotor holder body 221 may be formed in a cylindrical shape or a tubular shape. Also, the rotor sleeve body 211 may be formed of a synthetic resin material. At this time, the rotor holder body 221 may be disposed at the lower end of the rotor sleeve body 211 .

The first protrusion 222 protrudes inward from the inner circumferential surface 221a of the rotor holder body 221 in the radial direction. And, the first protrusion 222 is disposed inside the first hole 212 formed in the rotor sleeve 210 . At this time, as the rotor holder 220 is injection molded, the first protrusion 222 may be formed by filling the inside of the first hole 212 . Accordingly, the first protrusion 222 may be formed in a cylindrical shape.

That is, when the rotor holder 220 is disposed between the rotor sleeve 210 and the magnet 230 by the insert injection method, the first protrusion 222 of the rotor holder 220 forms the first hole of the rotor sleeve 210. (212).

Therefore, the coupling between the first hole 212 of the rotor sleeve 210 and the first protrusion 222 of the rotor holder 220 prevents slip from occurring between the rotor sleeve 210 and the rotor holder 220. .

As shown in FIG. 3 , the inner surface 222a of the first protrusion 222 is disposed on the same plane as the inner surface 211a of the rotor sleeve body 211 .

The key portion 223 protrudes inward from the inner circumferential surface 221a of the rotor holder body 221 in the radial direction. As shown in FIG. 4 , the key portion 223 may be disposed on the upper side of the rotor holder body 221 corresponding to the position of the groove 213 .

In addition, one area of the key portion 223 is disposed inside the groove 213 formed in the rotor sleeve 210 .

Therefore, the coupling between the groove 213 of the rotor sleeve 210 and the key portion 223 of the rotor holder 220 prevents slipping between the rotor sleeve 210 and the rotor holder 220.

Referring to FIG. 6 , an end of the key portion 223 protrudes inward by a predetermined length L1 based on the inner circumferential surface 211a of the rotor sleeve 210 .

Accordingly, when the input shaft is inserted into the rotor sleeve 210, the key unit 223 is coupled to the input shaft. Thus, rotation of the input shaft is accurately transmitted to the rotor 200 through the key portion 223 .

In addition, the load applied to the rotor 200 by the input shaft may be distributed to the rotor sleeve 210 and the rotor holder 220 . In detail, applied by the rotation of the input shaft by the coupling of the first hole 212 of the rotor sleeve 210 and the first protrusion 222 of the rotor holder 220 and the coupling of the input shaft and the key portion 223 Loads can be distributed.

7 is a plan view illustrating a rotor holder of a rotor of a sensing assembly according to an embodiment.

As shown in FIG. 7 , the width W1 of the key portion 223 is greater than the diameter D1 of the first protrusion 222 . In addition, three first protrusions 222 may be formed along the circumferential direction at intervals of 90 degrees.

The second hole 224 is formed in the rotor holder body 221 . The second hole 224 may be formed to penetrate the rotor holder body 221 in a radial direction. For example, one side of the second hole 224 may be disposed on the inner circumferential surface 221a of the rotor holder body 221 and the other side may be disposed on the outer circumferential surface 221b of the rotor holder body 221 .

In this case, a part of the magnet 230 may be disposed in the second hole 224 . For example, since the rotor holder 220 is disposed inside the magnet 230 by an insert injection method, the second protrusion 232 of the magnet 230 is disposed in the second hole 224 .

That is, when the rotor holder 220 is disposed between the rotor sleeve 210 and the magnet 230 by the insert injection method, the second hole 224 is formed by the second protrusion 232 of the magnet 230. do.

Meanwhile, the rotor holder 220 may further include a protrusion 225 protruding upward from the top surface 221c of the rotor holder body 221 . In this case, the protruding portion 225 may be disposed on the same radial line as the key portion 223 . Accordingly, the current position of the key part 223 can be grasped by determining the position of the protruding part 225 . Here, the protrusion 225 of the rotor holder 220 may be called a first protrusion or a rotor protrusion.

The magnet 230 is disposed outside the rotor holder 220 . Also, the magnets 230 are spaced apart from each other at predetermined intervals inside the stator 300 .

The magnet 230 may include a magnet body 231, a second protrusion 232 protruding inward from an inner circumferential surface of the magnet body 231, and a separation prevention protrusion 233 disposed on a side surface of the second protrusion.

The magnet body 231 may be formed in a cylindrical shape. The magnet body 231 is spaced apart from the rotor holder 220 at a predetermined distance (G).

As shown in FIGS. 5 and 6 , the inner circumferential surface 231a of the magnet body 231 is spaced apart from the outer circumferential surface 221b of the rotor holder body 221 at a predetermined interval G.

The thermal expansion rates of the rotor holder 220 and the magnet 230 are different, and even if the rotor holder 220 expands or contracts due to the ambient temperature difference, the gap G prevents the magnet 230 from being damaged. That is, the interval G serves as a buffer against the temperature difference.

The second protrusion 232 protrudes inward from the inner circumferential surface 231a of the magnet body 231 in a radial direction. And, the second protrusion 232 is disposed inside the second hole 224 formed in the rotor holder 220 . At this time, as the rotor holder 220 is injection molded, the second protrusion 232 may be formed by filling the inside of the second hole 224 .

Accordingly, coupling between the second hole 224 of the rotor holder 220 and the second protrusion 232 of the magnet 230 prevents slipping between the rotor holder 220 and the magnet 230 .

Accordingly, the amount of rotation of the input shaft based on the center (C) is the rotor holder 220 by the coupling of the first hole 212 of the rotor sleeve 210 and the first protrusion 222 of the rotor holder 220 , and the amount of rotation of the rotor holder 220 is accurately transmitted to the magnet 230 by coupling the second hole 224 of the rotor holder 220 and the second protrusion 232 of the magnet 230.

As shown in FIG. 3 , the inner surface 232a of the second protrusion 232 is disposed on the same plane as the inner surface 221a of the rotor holder body 221 .

Referring to FIG. 4 , the separation prevention protrusion 233 is formed on the side surface of the second protrusion 232 . The departure prevention protrusion 233 is formed on the side surface of the second protrusion 232 as an example, but is not necessarily limited thereto.

The separation prevention protrusion 233 is disposed inside the rotor holder body 221 by injection molding of the rotor holder 220 . To this end, a groove may be formed on the inner surface of the rotor holder body 221 forming the second hole 224 .

Accordingly, the separation preventing protrusion 233 prevents the magnet 230 from flowing or separating in the radial direction.

The stator 300 is disposed outside the magnet 230 of the rotor 200.

8 is a perspective view showing a stator of a sensing assembly according to an embodiment, FIG. 9 is an exploded perspective view showing a stator of a sensing assembly according to an embodiment, and FIG. 10 is a plan view showing a stator of a sensing assembly according to an embodiment. 11 is a view showing a cross section taken along line B-B in FIG. 10 .

8 to 11 , the stator 300 may include a stator sleeve 310, a stator holder 320, and a pair of stator rings 330.

The stator sleeve 310 may be formed in a cylindrical shape. Also, the stator sleeve 310 may be connected to the output shaft of the steering shaft. Here, the output shaft may be connected to a power transmission component on the wheel side. Therefore, the stator 300 is connected to the output shaft and can rotate together with the output shaft.

The stator sleeve 310 may be formed of a metal material.

The stator sleeve 310 may include a stator sleeve body 311 and a third hole 312 and a groove 313 formed in the stator sleeve body 311 . Here, for distinction from the groove 213 of the rotor 200, the groove 313 of the stator sleeve 310 may be referred to as a stator groove or a second groove.

The stator sleeve body 311 may be formed in a cylindrical shape or a tubular shape. Also, the stator sleeve body 311 may be formed of a metal material. At this time, the stator sleeve body 311 may be coupled to the end of the output shaft.

The third hole 312 may be formed in a circular shape. The third hole 312 may be formed to penetrate the stator sleeve body 311 in a radial direction. For example, one side of the third hole 312 may be disposed on the inner circumferential surface 311a of the stator sleeve body 311 and the other side may be disposed on the outer circumferential surface 311b of the stator sleeve body 311. In this case, a part of the stator holder 320 may be disposed in the third hole 312 .

A plurality of third holes 312 may be formed. Here, the third holes 312 may be disposed in the stator sleeve body 311 along the circumferential direction at predetermined intervals.

As shown in FIG. 9 , the groove 313 may be formed in an arch shape at an upper end of the stator sleeve body 311 . Here, the shape of the groove 313 is formed in an arch shape as an example, but is not necessarily limited thereto. For example, the shape of the groove 313 may be formed to correspond to the shape of the vertical section of the key portion 323 of the stator holder 320 .

At this time, the groove 313 may be formed by cutting a region of the upper end of the stator sleeve body 311 .

A stator holder 320 may be disposed on an upper side of the stator sleeve 310 . Here, the stator holder 320 may be formed of a synthetic resin such as resin. Accordingly, the stator holder 320 may be disposed at the upper end of the stator sleeve 310 by an insert injection method. Accordingly, a portion of the stator holder 320 may be disposed in the third hole 312 and groove 313 of the stator sleeve 310 .

The stator holder 320 includes a stator holder body 321, a third protrusion 322 protruding inward in a radial direction from the inner circumferential surface 321a of the stator holder body 321, and an inner circumferential surface of the stator holder body 321 ( 321a) may include a key portion 323 protruding inward with respect to the radial direction. Here, the key part 323 of the stator holder 320 may be called a second key part or a stator key part.

The stator holder body 321 may be formed in a cylindrical shape. Also, the stator sleeve body 311 may be formed of a synthetic resin material. At this time, the stator holder body 321 may be disposed at an upper end of the stator sleeve body 311 .

The third protrusion 322 protrudes inward from the inner circumferential surface 321a of the stator holder body 321 in a radial direction. Also, the third protrusion 322 is disposed inside the third hole 312 formed in the stator sleeve 310 . At this time, as the stator holder 320 is injection molded, the third protrusion 322 may be formed by filling the inside of the third hole 312 . Accordingly, the third protrusion 322 may be formed in a cylindrical shape.

That is, when the stator holder 320 is disposed at the end of the stator sleeve 310 by the insert injection method, the third protrusion 322 of the stator holder 320 is formed in the third hole 312 of the stator sleeve 310. is formed by

Therefore, the coupling between the third hole 312 of the stator sleeve 310 and the third protrusion 322 of the stator holder 320 prevents slip from occurring between the stator sleeve 310 and the stator holder 320. .

As shown in FIG. 8 , the inner surface 322a of the third protrusion 322 is disposed on the same plane as the inner surface 311a of the stator sleeve body 311 .

The key portion 323 protrudes inward from the inner circumferential surface 321a of the stator holder body 321 in the radial direction. As shown in FIG. 9 , the key portion 323 may be disposed on the upper side of the stator holder body 321 corresponding to the location of the groove 313 .

In addition, one area of the key portion 323 is disposed inside the groove 313 formed in the stator sleeve 310 .

Accordingly, coupling between the groove 313 of the stator sleeve 310 and the key portion 323 of the stator holder 320 prevents slipping between the stator sleeve 310 and the stator holder 320.

Referring to FIG. 11 , an end of the key portion 323 protrudes inward by a predetermined length L2 based on the inner circumferential surface 311a of the stator sleeve 310 .

Accordingly, when the output shaft is inserted into the stator sleeve 310, the key unit 323 is coupled to the output shaft. Thus, the rotation of the output shaft is accurately transmitted to the stator 300 through the key portion 323.

In addition, the load applied to the stator 300 by the output shaft may be distributed to the stator sleeve 310 and the stator holder 320 . In detail, applied by the rotation of the output shaft by the coupling of the third hole 312 of the stator sleeve 310 and the third protrusion 322 of the stator holder 320 and the coupling of the output shaft and the key portion 323 Loads can be distributed.

12 is a bottom view illustrating a stator holder of a stator of a sensing assembly according to an embodiment.

As shown in FIG. 12 , the width W2 of the key portion 323 is greater than the diameter D2 of the third protrusion 322 . In addition, three third protrusions 322 may be formed along the circumferential direction at intervals of 90 degrees.

Meanwhile, the key portion 223 of the rotor holder 220 and the key portion 323 of the stator holder 320 may be disposed on the same line with respect to the axial direction. Accordingly, the rotor 200 and the stator 300 may be aligned in the axial direction. Accordingly, the input shaft connected to the rotor 200 and the output shaft connected to the stator 300 may be zero-adjusted.

The stator holder 320 may further include a protrusion 324 protruding downward from the lower surface 321c of the stator holder body 321 .

The protruding portion 324 may be disposed on the same radial line as the key portion 323 . Accordingly, the current position of the key part 323 can be grasped by determining the position of the protruding part 324 . Here, the protrusion 324 of the stator holder 320 may be called a second protrusion or a stator protrusion.

A pair of stator rings 330 may be fixedly disposed on each of the upper and lower portions of the stator holder 320 to cover a portion of the outer surface of the stator holder 320 .

The stator ring 330 includes a ring-shaped body 331, a plurality of teeth 332 extending axially from the inner circumferential surface of the body 331, and a plurality of protrusions 333 extending axially from the outer circumferential surface of the body 331. ) may be included. Also, the body 331, the tooth 332, and the protrusion 333 may be integrally formed. At this time, the teeth 332 of the stator ring 330 disposed above the stator holder 320 and the teeth 332 of the stator ring 330 disposed below the stator holder 320 fit each other at a predetermined interval. It can be arranged in a snapping form.

The protrusion 333 may be fixed to the stator holder 320 in a caulking method in which an end portion is pressed and bent.

The main gear 400 is disposed under the stator 300.

The main gear 400 is coupled to the stator 300 and interlocks with the rotation of the stator 300. At this time, gear teeth may be formed on the outer circumferential surface of the main gear 400 .

The sub gear 500 meshes with the gear teeth of the main gear 400 and interlocks with the rotation of the main gear 400 .

As shown in FIG. 2 , the sub gear 500 may mesh with gear teeth of the main gear 400 . Also, two sub gears 500 may be disposed.

Here, two sub-gears 500 are arranged as an example in order to realize an effective difference in rotation amount, but are not necessarily limited thereto, and in some cases, one or a plurality of three or more may be arranged.

In addition, a sub-magnet (angle magnet) may be disposed in each of the sub-gears 500 .

An angle sensor (magnetic element, not shown) capable of measuring the magnetic field generated by the rotation of the sub-magnet disposed on the sub-gear 500 is mounted on the circuit board 600 disposed outside the stator 300. .

The angle sensor may be disposed at a position corresponding to the sub-magnet of the sub-gear 500 to sense a change in the magnetic field of the sub-magnet. Accordingly, the angle sensor may detect an angle, which is a rotation amount of the steering shaft, by detecting a rotation amount and a rotation speed.

When twist occurs between the input shaft and the output shaft, a rotational difference between the rotor 200 and the stator 300 occurs, which is detected as a change in magnetic force.

At this time, the collector 700 enables a sensor disposed on the circuit board 600 to detect the change in the magnetic force.

The collector 700 may collect flux of the stator 300 . Here, the collector 700 may be formed of a metal material and may be fixed inside the housing 100 .

The collector 700 may include a plate 710 and a leg 720 .

The plate 710 may be formed in a plate shape. And, the plate 710 may be disposed adjacent to the body 331 of the first stator ring 330 .

The leg 720 may protrude from the plate 710 in an axial direction. At this time, the leg 720 may be bent outward. Also, an end of the leg 720 may be bent in a radial direction.

As shown in FIG. 2 , two collectors 700 may be provided.

The collector 700 may be divided into an upper collector 700a and a lower collector 700b according to the arrangement position.

The upper collector 700a may be disposed adjacent to the upper stator ring, and the lower collector 700b may be disposed adjacent to the lower stator ring. Here, adjacency may mean contact or being spaced apart at a predetermined interval.

The circuit board 600 may include a torque sensor (not shown) capable of detecting torque in addition to the angle sensor (magnetic element). Here, the angle sensor and the torque sensor may be Hall ICs.

The torque sensor may be disposed at a position corresponding to an end of the leg 720 . For example, the torque sensor may be disposed facing the end of the leg 720 .

As twist occurs between the input shaft and the output shaft, a rotational difference between the rotor 200 and the stator 300 occurs, and the torque sensor detects a change in magnetic force through the collector 700. Accordingly, the torque sensor may measure a torque capable of smoothly adjusting the handle.

The bracket 800 may be disposed under the stator 300. Here, the bracket 800 may be called a middle case.

Any one of the collectors 700 may be disposed on the bracket 800 .

On the upper side of the bracket 800, the rotor 200 and the stator 300, which perform the sensing role of the torque sensor, are disposed, and the main gear 400 and the sub gear 400, which perform the sensing role of the angle sensor, are disposed on the lower side. A gear 500 is disposed.

The rotor holder body 221 or the stator holder body 321 described above may be referred to as a rotor holder body or a stator holder body, and may be referred to as a first body or a second body.

Also, the rotor sleeve body 211 may be referred to as a rotor sleeve body, the magnet body 231 may be referred to as a magnet body, and the stator sleeve body 311 may be referred to as a stator sleeve body.

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art can variously modify and modify the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be changed. And, it should be construed that the differences related to these modifications and changes are included in the scope of the present invention, which is defined in the appended claims.

1: sensing assembly
100: housing
200: rotor
300: stator
400: main gear
500: sub gear
600: circuit board
700: collector
800: bracket

Claims (15)

A rotor including a magnet;
a stator disposed outside the magnet;
a main gear coupled to the stator;
a sub gear engaged with the main gear;
a circuit board disposed outside the stator;
a collector disposed between the stator and the circuit board;
a bracket disposed under the stator; and
A housing accommodating the rotor, the stator, the main gear, the sub gear, the circuit board, the collector, and the bracket therein,
The rotor includes a rotor sleeve, a rotor holder disposed outside an end of the rotor sleeve, and a magnet disposed outside the rotor holder,
The rotor holder includes a rotor holder body and a first protrusion protruding inward from an inner circumferential surface of the rotor holder body,
The rotor sleeve includes a first hole passing through an inner circumferential surface and an outer circumferential surface,
The first protrusion is disposed inside the first hole,
The rotor sleeve further includes a groove formed at a lower end,
The rotor holder further includes a key portion protruding inward from the rotor holder body,
The key portion is disposed in the groove,
The sensing assembly of claim 1 , wherein a width (W1) of the key portion is greater than a diameter (D1) of the first protrusion. delete According to claim 1,
An end portion of the key part protrudes inward by a predetermined length (L1) based on the inner circumferential surface of the rotor sleeve. delete According to claim 1,
The magnet includes a magnet body and a second protrusion protruding inward from the magnet body,
The sensing assembly in which the second protrusion is disposed inside the second hole formed in the rotor holder body. According to claim 5,
An outer circumferential surface of the rotor holder body is disposed spaced apart from an inner circumferential surface of the magnet body at a predetermined distance (G). According to claim 5,
The magnet further includes a separation prevention protrusion formed on a side surface of the second protrusion,
The separation preventing protrusion is a sensing assembly disposed inside the rotor holder body. According to claim 1,
The stator is
stator sleeve;
a stator holder disposed outside an end of the stator sleeve; and
A pair of stator rings disposed to cover a portion of the outer surface of the stator holder;
The stator holder includes a stator holder body and a third protrusion protruding inward from an inner circumferential surface of the stator holder body,
The sensing assembly wherein the third protrusion is disposed inside the third hole formed in the stator sleeve. A rotor including a magnet;
a stator disposed outside the magnet;
a main gear coupled to the stator;
a sub gear engaged with the main gear;
a circuit board disposed outside the stator;
a collector disposed between the stator and the circuit board;
a bracket disposed under the stator; and
A housing accommodating the rotor, the stator, the main gear, the sub gear, the circuit board, the collector, and the bracket therein,
The stator is
stator sleeve,
A stator holder disposed outside the end of the stator sleeve, and
A pair of stator rings disposed to cover a portion of the outer surface of the stator holder;
The stator holder includes a stator holder body and a third protrusion protruding inward from an inner circumferential surface of the stator holder body,
The third protrusion is disposed inside the third hole formed in the stator sleeve,
The stator sleeve further includes a groove formed at an upper end,
The stator holder further includes a key portion protruding inward from the stator holder body,
The key portion is disposed in the groove,
Based on the inner circumferential surface of the stator sleeve, an end of the key unit protrudes inward by a predetermined length (L2),
The sensing assembly of claim 1 , wherein a width (W2) of the key portion is greater than a diameter (D2) of the third protrusion. delete delete delete delete delete delete

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