KR20150125329A - Motor - Google Patents

Abstract

The present invention provides a motor which includes a stator, a rotor which is arranged in the stator, a shaft which is combined with the rotor, a bearing part which rotationally supports the shaft, a housing which includes a receiving space which receives the bearing part with a lower side thereof which is opened, and a bracket which is combined with the lower side of the housing and covers the receiving space. The bracket includes an elastic piece which protrudes with a bottom side which is cut and is pressed in contact with the lower side of the bearing part. A preload configuration for a bearing is simplified by one component.

Description

Motor {Motor}

The present invention relates to a motor, and more particularly, to a motor including a bearing.

A motor is a device that converts electrical energy into rotational energy using the force that a conductor receives in a magnetic field. Recently, as the use of motors has expanded, the role of the motor has become important. Particularly, in addition to the motors applied to the steering system and the design system as the electric field of the automobile is rapidly progressing, it is applied to the fuel economy saving or autonomous driving system which starts the engine after the vehicle is stopped, such as an idle start and go Demand for motors is also increasing significantly.

Generally, the motor is provided with a shaft rotatably formed, a rotor coupled to the shaft, and a stator fixed to the inside of the housing, wherein a stator is installed with a gap along the circumference of the rotor. And a coil for forming a rotating magnetic field is wound around the stator to induce electrical interaction with the rotor to induce rotation of the rotor. When the rotor rotates, the shaft rotates and supplies the necessary power to the vehicle.

On the other hand, since the rotor may vibrate under the condition that the motor receives the axial direction, a bearing for rotatably supporting the shaft may be provided. The bearing supporting the lower portion of the shaft can be coupled to the bottom of the housing. At this time. In order to increase the rigidity of the bearing and reduce the tolerance, a preload to the bearing is required, and an elastic member such as a wave washer is configured to pressurize the lower surface of the bearing to apply a preload.

At this time, the wave washer is supported by a separate bracket coupled to the lower surface of the housing. That is, in order to pre-press the bearings, two parts (a wave washer and a bracket for fixing the wave washer) are required.

As a result, noise is generated due to the flow between the wave washer and the bracket. Further, there is a problem that the process of assembling the wave washer is troublesome.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a motor that simplifies a preload configuration of a bearing to reduce noise and simplify an assembling process.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned here can be understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a stator comprising: a stator; a rotor disposed inside the stator; a shaft coupled to the rotor; a bearing portion rotatably supporting the shaft; And a bracket that is coupled to a lower surface of the housing and covers the accommodation space, wherein the bracket is protruded from a bottom surface in an incised shape, It is possible to provide a motor including a slice.

Preferably, the bearing portion includes a bearing including an outer ring in contact with the housing and an inner ring in contact with the shaft, and a sensor portion coupled to the bearing to sense a displacement of the inner ring.

Preferably, the elastic segment may support a lower surface of the sensor unit.

Preferably, the plurality of elastic segments may be disposed apart from each other along the circumferential direction.

Preferably, the body of the elastic segment is elongated in the circumferential direction and the fixed end of the body is formed in the radial direction.

Preferably, a gap may be formed between the inner peripheral surface of the sensor portion and the shaft.

Preferably, the sensor unit may include a fixing protrusion protruding from the inner circumferential surface.

Preferably, the bracket may include a fixing piece protruding from a bottom surface and having a slot into which the fixing protrusion is inserted.

Preferably, the bracket may include a hole through which the sensor portion penetrates.

Preferably, the fixing piece may protrude from an inner peripheral surface of the hole.

Preferably, the bracket may include a cylindrical body including the bottom surface and a coupling flange formed horizontally along an upper periphery of the body.

According to one embodiment of the present invention, by providing the bracket including the resilient piece for press-contacting the lower surface of the bearing portion, the advantageous effect of simplifying the preload configuration for the bearing into one component is provided. In addition, since the elastic piece is provided with a preload only by the step of fastening the bracket to the bottom surface of the housing, the assembling process is simple and the noise is generated due to the flow between the bracket and the wave washer, .

1 shows a motor according to a preferred embodiment of the present invention,
2 is a view showing a bearing portion which is engaged with a bottom surface of the housing,
3 is a view showing a bracket including an elastic section,
4 is a view showing a bracket coupled to a lower surface of the housing.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages, and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary terms and the inventor should properly define the concept of the term in order to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

It is to be 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, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

If a separate preload member such as a wave washer is used under the bearing, noise is generated due to the flow of the bracket supporting the wave washer and the wave washer. In addition, the assembling process of the wave washer is complicated and the productivity of the motor is lowered. In order to fundamentally solve such a problem, the motor according to an embodiment of the present invention is designed to realize a preload configuration for a bearing as a single part.

1 is a view showing a motor according to a preferred embodiment of the present invention. It will be apparent to those skilled in the art from this disclosure that Fig. 1 clearly shows only the main feature parts in order to clearly illustrate the invention, and as a result various variations of the illustration are to be expected and the scope of the invention There is no.

1, a motor according to an embodiment of the present invention includes a stator 110, a rotor 120, a shaft 130, a bearing portion 140, a housing 150, a bracket 160 < / RTI >

A rotor 120 is disposed inside the stator 110. The shaft 130 may be coupled to the interior of the rotor 120. The bearing portion 140 may be coupled to the lower end of the shaft 130. The bearing part 140 rotatably supports the rotor 120 and supports the axial load. Meanwhile, the stator 110 may be fixed to the housing 150.

Fig. 2 is a view showing a bearing portion that engages with the bottom surface of the housing.

The bearing portion 140 may be embodied as a sensor bearing including a bearing 141 including an outer ring 141a and an inner ring 141b and a sensor portion 142 measuring a displacement of the inner ring 141b. The outer ring 141a of the bearing 141 contacts the housing 150 and the inner ring 141b of the bearing 141 can contact the shaft 130. [

The sensor unit 142 may be disposed under the bearing 141 and may include a magnet that rotates in conjunction with the inner ring 141b and a Hall element that senses the rotation of the magnet. . A gap may be formed between the inner circumferential surface of the sensor portion 142 and the shaft 130. A through hole may be formed at the center of the sensor portion 142 to allow the shaft 130 to pass therethrough.

On the other hand, the fixing protrusion 143 may protrude from the inner circumferential surface of the sensor unit 142. The fixing protrusion 143 may protrude radially toward the shaft 130 when the bearing 141 is press-fitted into the shaft 130. The fixing protrusion 143 is inserted into the fixing piece 163 formed on the bracket 160 and restrains the bearing 141 from slipping in the rotating direction.

The fixing protrusion 143 may be integrally formed with the sensor portion 142 and may be formed in a shape having both side surfaces in a planar shape. The height of the fixing protrusion 143 may be appropriately designed in consideration of the gap between the inner peripheral surface of the sensor portion 142 and the shaft 130 so that the end of the fixing protrusion 143 and the shaft 130 are not in contact with each other have.

A bearing pocket portion 151 may protrude from the bottom surface of the housing 150. Inside the bearing pocket portion 151, a receiving space into which the bearing 141 is inserted can be formed. The bearing pocket portion 151 may have a top and an open bottom. The side wall constituting the bearing pocket portion 151 and the outer ring of the bearing 141 may be formed to be in contact with each other. The side wall forming the bearing pocket portion 151 and the outer peripheral surface of the sensor portion 142 may be formed apart from each other.

3 is a view showing a bracket including an elastic section. 4 is a view showing a bracket coupled to a lower surface of the housing.

3 and 4, the bracket 160 may include an elastic piece 161a to which a preload is applied. The elastic section 161a is a member for pressing and preliminarily pressing the lower surface 142a of the sensor unit 142 of the bearing unit 140. The elastic section 161 is formed by protruding upward in the bottom surface 161 of the bracket 160 A plurality of elastic pieces 161a may be disposed apart from each other along the circumferential direction with respect to the hole 161b formed in the center of the bracket 160. In this case, At this time, the body constituting the elastic segment 161a may be formed long along the circumferential direction, and the fixed end 161ab of the body may be formed in the radial direction.

By forming the elastic piece 161a, which is a preload member, by cutting the bottom surface 161 of the bracket 160, unlike the prior art, there is an advantage that the preload configuration for the bearing part 140 can be realized as a single part.

The bracket 160 may include a cylindrical body 162a including a bottom surface 161 and a coupling flange 162b formed horizontally along an upper periphery of the body 162a. A plurality of fastening holes 162c into which the bolts are inserted may be formed in the coupling flange 162b.

The height of the body 162a may be appropriately designed so that the elastic piece 161a can press the lower surface of the bearing portion 140 when the engagement flange 162b is coupled to the housing 150. [

When the bracket 160 is coupled to the housing 150, the resilient piece 161a is pushed by the bearing portion 140 and is elastically deformed about the fixed end 161ab, thereby preloading the bearing portion 140. [

On the other hand, the bracket 160 may include a fixing piece 163. The fixing piece 163 may be protruded upward from the inner circumferential surface of the hole 161b formed in the center of the bracket 160. In this case, The fixing part 163 may be formed as a plate having a curved surface and a slot 163a through which the fixing protrusion 143 formed on the inner circumferential surface of the sensor part 142 is inserted may be formed on the upper part. The slot 163a may be formed to correspond to the shape and size of the fixing protrusion 143. [ The slot 163a may be formed to have both side surfaces in a planar shape.

When the bracket 160 is engaged with the lower surface of the housing 150, the fixing piece 163 is inserted into a gap between the shaft 130 and the inner circumferential surface of the sensor portion 142, The fixing protrusion 143 is inserted. When the fixing protrusion 143 is inserted into the fixing piece 163, the bearing portion 140 is restrained in the rotating direction by the bracket 160, so that the bearing portion 140 can be prevented from slipping.

As described above, the motor according to one preferred embodiment of the present invention has been specifically described with reference to the accompanying drawings.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

110:
120: Rotor
130: shaft
140: bearing part
141: Bearings
141a: outer ring
141b: inner ring
142:
143: Fixing projection
150: Housing
160: Bracket
161: bottom surface
161a: elastic section
161b: hole
162a: Body
162c: fastening hole
162b: coupling flange
161ab: fixed end
163:
163a: slot

Claims (11)

Stator;
A rotor disposed inside the stator;
A shaft coupled to the rotor;
A bearing portion rotatably supporting the shaft;
A housing including a bearing portion for receiving the bearing portion in a state that the lower portion thereof is open;
And a bracket coupled to a lower surface of the housing to cover the accommodation space,
Wherein the bracket includes a resilient piece that protrudes from a bottom surface and is in pressing contact with a lower surface of the bearing. The method according to claim 1,
Wherein the bearing includes a bearing including an outer ring in contact with the housing and an inner ring in contact with the shaft, and a sensor coupled to the bearing to sense displacement of the inner ring. 3. The method of claim 2,
And the elastic piece supports the lower surface of the sensor unit. The method of claim 3,
And the plurality of elastic segments are disposed apart from each other along the circumferential direction. 5. The method of claim 4,
Wherein the body of the elastic segment is elongated along a circumferential direction and the fixed end of the body is formed in a radial direction. 3. The method of claim 2,
And a gap is formed between the inner peripheral surface of the sensor portion and the shaft. The method according to claim 6,
And the sensor portion includes a fixing protrusion protruding from the inner circumferential surface. 8. The method of claim 7,
Wherein the bracket includes a fixing piece protruding from a bottom surface and having a slot into which the fixing protrusion is inserted. 9. The method of claim 8,
Wherein the bracket includes a hole through which the sensor portion passes. 10. The method of claim 9,
And the fixing piece is protruded from an inner peripheral surface of the hole. The method according to claim 1,
Wherein the bracket includes a cylindrical body including the bottom surface and a coupling flange formed horizontally along an upper periphery of the body.

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