Bearing with anti-corrosion function

Abstract

The utility model relates to a bearing with an anti-corrosion function. Compared with the prior art, lower material cost and weight and also significantly reduced rotational friction can be ensured by using a bearing fitted to a motor shaft of a smaller size for anti-corrosion function, and by having a conductive seal formed in a brush type and in contact with an end cap and a rear cap in the axial direction, the motor can be more compact and more compact. The utility model is advantageous in noise, vibration and harsh sound of the vehicle.

Description

Technical Field

[0001] The following disclosure relates to a bearing having an anti-corrosion function, and more particularly to a bearing assembled to a motor shaft. Background Art

[0002] A conventional drive system in an apparatus for driving an electric vehicle applies a bearing anti-corrosion structure to a drive motor. The purpose of the bearing anti-corrosion structure is to prevent bearing corrosion caused by parasitic currents occurring in the drive motor shaft and to improve vibration and noise caused by loads applied and transmitted to the drive motor shaft.

[0003] The prior art prevents corrosion between a rotor shaft, an end cover, and a rear cover by fixedly mounting a shaft grounding ring (SGR) to an end cover or a rear cover provided at the front or rear of a drive motor and connecting a conductive seal of the SGR to a rotating shaft of the drive motor.

[0004] However, the SGR adopted in the prior art has an outer diameter that is press-fitted to the end cap and an inner diameter that is press-fitted to the shaft, resulting in a fast linear speed and a large rotational friction force, which may cause damage to the SGR over a long period of use.

[0005] Furthermore, the prior art using the inner diameter of the shaft in contact with the outer diameter may have difficulty reducing its material cost and weight due to the large SRG. Utility Model Content

[0006] One embodiment of the present disclosure is directed to providing a bearing having an anti-corrosion function, which can ensure lower material cost and weight by adopting a smaller size than the prior art.

[0007] Another embodiment of the present disclosure is directed to providing a bearing with an anti-corrosion function, which can ensure significantly reduced rotational friction and is advantageous in terms of noise, vibration and harshness (NVH) of a vehicle by having a conductive seal formed in a brush type and contacting an end cover and a rear cover in an axial direction.

[0008] Still another embodiment of the present disclosure is directed to providing a bearing having an anti-corrosion function, which can ensure an improved function of electric current through an increased contact area obtained by adjusting an angle of a conductive seal.

[0009] In a general aspect, a bearing with an anti-corrosion function is provided, the bearing with an anti-corrosion function comprising: a brush portion, the brush portion comprising a plurality of brush strands; and a press-fit fixing portion, a first end of the brush portion being connected to the press-fit fixing portion, an outer surface of the press-fit fixing portion being press-fit fixed to an inner surface of one end of a motor shaft, wherein the brush portion has a first end connected to the press-fit fixing portion and a second end in contact with an end cover of the motor, and the second end of the brush portion extends outward from one end of the press-fit fixing portion so that the end cover and one end of the motor shaft are spaced a predetermined distance from each other.

[0010] The press-fit fixing portion may include a brush press-fit groove formed inwardly in one surface of the press-fit fixing portion facing the end cover.

[0011] The brush press-fit groove may be formed in a circle drawn around a rotation axis of the motor shaft, and a radial distance from the brush press-fit groove to the rotation axis decreases as the brush press-fit groove extends inward from the one surface of the press-fit fixing portion.

[0012] The brush press-fit groove may be formed in a circle drawn around a rotation axis of the motor shaft, and a radial distance from the brush press-fit groove to the rotation axis increases as the brush press-fit groove extends inward from the one surface of the press-fit fixing portion.

[0013] The bearing with anti-corrosion function may also include a bent fixing portion, which extends from one end of the press-fit fixing portion in a radial direction, wherein the bent fixing portion includes: a bent portion, which bends when force is applied to a connecting portion between it and the press-fit fixing portion; and a fixing step, which protrudes from an extended end of the bent fixing portion and may be concavely formed with an insertion groove in the outer surface of the motor shaft, and the insertion groove is connected to the fixing step.

[0014] Each brush strand may include a bent portion bent in a U-shape, and the brush portion may include a ring member press-fitted into the brush press-fit groove while being fitted onto the bent portion of the brush strand.

[0015] The brush strand may have a first end coupled to a predetermined position of the brush press-fit recess and a second end offset in a rotational direction relative to the first end of the brush strand.

[0016] The brush portion may include at least one brush assembly, the plurality of brush strands being aggregated in the at least one brush assembly, the second end of each of some of the brush strands included in the brush assembly being biased in the one rotational direction compared to the first end of the corresponding brush strand, and the second end of each of the remaining brush strands included in the brush assembly being biased in a rotational direction opposite to the one rotational direction compared to the first end of the corresponding brush strand.

[0017] The multiple brush strands can be arranged in two or more rows along the radial direction, and among the multiple brush strands arranged in two or more rows along the radial direction, the brush strands arranged in the row closer to the rotation axis of the motor shaft can be made of a material with higher wear resistance and higher conductivity under the same load.

[0018] When the press-fit fixing portion is away from the rotation axis of the motor shaft, the brush strands may have a greater length extending outwardly in an axial direction.

[0019] Other features and aspects will be apparent from the following detailed description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a partial cross-sectional view of a motor using a bearing having an anti-corrosion function according to the present disclosure.

[0021] Figure 2 is a cross-sectional view of a bearing with an anti-corrosion function according to the present disclosure.

[0022] Figure 3 is a perspective view showing a bearing having an anti-corrosion function when the first embodiment of the brush press-fit groove according to the present disclosure is used.

[0023] Figure 4 is a partial cross-sectional view of a motor when the first embodiment of the brush press-fit groove according to the present disclosure is used.

[0024] Figure 5 is a perspective view showing a bearing having an anti-corrosion function when a second embodiment of a brush press-fit groove according to the present disclosure is used.

[0025] Figure 6 2 is a conceptual diagram showing a curved fixing portion of the present disclosure.

[0026] Figure 7 is a cross-sectional view of a bearing having an anti-corrosion function using a curved fixing portion according to the present disclosure.

[0027] Figure 8 is a partial cross-sectional view showing a first embodiment of a brush portion according to the present disclosure.

[0028] Fig. 9 is a perspective view showing a second embodiment of a brush portion according to the present disclosure.

[0029] Fig.10 is a plan view showing a third embodiment of a brush portion according to the present disclosure. DETAILED DESCRIPTION

[0030] Hereinafter, the technical spirit of the present disclosure will be described in more detail with reference to the accompanying drawings. Before the description, the terms and words used in the specification and claims should not be interpreted as general or dictionary meanings, but should be interpreted as meanings and concepts that conform to the spirit of the present disclosure, which is based on the concept that the inventor can appropriately define the terms in order to best describe the principle of its practical novelty.

[0031] See below Figure 1 and Figure 2 , the basic structure of the bearing 1000 with corrosion protection function disclosed in the present invention is described.

[0032] like Figure 1 As shown, the bearing 1000 with an anti-corrosion function of the present disclosure may include a brush portion 100 including a plurality of brush strands 110. The brush portion 100 may be used as a conductive seal and may be made of a conductive material. Here, the brush portion 100 may have one end connected to a press-fit fixing portion 200 and the other end in contact with the end cover E of the motor, and extend from the outside to the other side of the press-fit fixing portion 200, thereby allowing the end cover E and one end of the motor shaft S to be spaced apart from each other by a predetermined distance. Therefore, an electric field may be induced to move along the brush portion 100 toward the end cover E, thereby preventing corrosion from occurring in the bearing 1000 with an anti-corrosion function.

[0033] In addition, the bearing 1000 with an anti-corrosion function of the present disclosure may include a press-fit fixing portion 200. The press-fit fixing portion 200 may be coupled to one end of the brush portion 100 and press-fit fixed to the inner surface of one end of the motor shaft S. Figure 2 As shown, the press-fit fixing portion 200 of the bearing 1000 with an anti-corrosion function may include a brush press-fit groove 210 formed inwardly in a surface of the press-fit fixing portion 200 facing the end cover E. The brush press-fit groove 210 may be formed by considering the thickness of the brush strand 110. As described above, the bearing 1000 with an anti-corrosion function may be assembled into the motor shaft S. Therefore, the present disclosure may provide the same performance with a smaller size compared to the prior art, thereby reducing the material cost and weight of the bearing 1000 with an anti-corrosion function. In addition, due to the smaller size, the bearing 1000 with an anti-corrosion function may have reduced rotational friction, which is advantageous in terms of noise, vibration and harshness (NVH) of the vehicle.

[0034] Below, refer to Figures 3 to 5 An embodiment of the brush-fit groove 210 of the bearing 1000 with an anti-corrosion function according to the present disclosure is described in more detail.

[0035] exist Figure 3 In the first embodiment of the brush press-fit groove 210 shown, the brush press-fit groove 210 may be formed as a circle drawn around the rotation axis of the motor shaft S, and the brush press-fit groove 210 may be closer to the rotation axis as the brush press-fit groove 210 extends inward from one surface of the press-fit fixing portion 200. In addition, the brush portion 100 may have one end of the brush groove fixed to the press-fit fixing portion 200 and the other end extending outward from the press-fit fixing portion 200 and the motor shaft S to contact the end cap E. Therefore, the brush portion 100 may be configured to expand toward the end cap E.

[0036] Here, the brush portion 100 may be made of a material that allows the brush portion 100 to be sufficiently bent under the force for fixing the positions of the end cap E and the motor shaft S. Figure 4 As shown, the brush portion 100 may be bent outward in the radial direction to have a constant surface in contact with the end cap E. Therefore, the electric field may be caused to move toward the end cap E along the brush portion 100 .

[0037] In addition, Figure 5 In the second embodiment of the brush press-fit groove 210 shown, the brush press-fit groove 210 may be formed as a circle drawn around the rotation axis of the motor shaft S, and may be away from the rotation axis as the brush press-fit groove 210 extends inwardly from one surface of the press-fit fixing portion 200. Therefore, the brush portion 100 may be arranged to converge toward the end cap E. By adopting such a shape in the second embodiment, the present disclosure may reduce the rotational linear velocity of the brush portion 100 when the motor shaft S rotates, and minimize the wear of the brush, thereby enabling its long-term use.

[0038] In the following, reference Figure 6 and Figure 7 The bent fixing portion of the bearing 1000 with an anti-corrosion function according to the present disclosure is described in more detail.

[0039] like Figure 6As shown, the bearing 1000 with an anti-corrosion function of the present disclosure may further include a bent fixing portion 220 extending from one end of the press-fit fixing portion 200 in a radial direction. The bent fixing portion 220 may include a bent portion 221 that bends when a force is applied to a connection portion thereof with the press-fit fixing portion 200. The bent fixing portion 220 may be formed integrally with the press-fit fixing portion 200, and each of the bent fixing portion 220 and the press-fit fixing portion 200 may be made of steel. Since the bent fixing portion 220 is made of steel, the bent fixing portion 220 may be easily bent based on the user's intention, depending on the thickness of the bent fixing portion 220, and when no external force is applied to the bent fixing portion 220, the bent fixing portion 220 may not return to its initial state.

[0040] In addition, if Figure 7 As shown, the bent fixing portion may include a fixing step 222 protruding from an extended end thereof and an insertion groove 223 recessedly formed in the outer surface of the motor shaft S and coupled to the fixing step 222. Therefore, the bent fixing portion may be coupled to the outer surface of the motor shaft S, and ultimately allow the bearing 1000 with an anti-corrosion function of the present disclosure to be doubly coupled to the inner side (i.e., the press-fit fixing portion 200) and the outer side (i.e., the bent fixing portion 220) of the motor shaft S, thereby increasing the coupling force between the bearing 1000 with an anti-corrosion function and the motor shaft S.

[0041] In addition, the bearing 1000 with an anti-corrosion function of the present disclosure may include a bracket instead of the bent fixing portion 220. In more detail, the bracket may be separated from the press-fit fixing portion 200, and have one end inserted into the insertion groove 223 of the motor shaft S and the other end coupled to one surface of the press-fit fixing portion 200. Therefore, the bearing 1000 with an anti-corrosion function and the motor shaft S may be easily attached to and detached from each other.

[0042] In the following, reference will be made to Figures 8 to 10 Various embodiments of the brush portion 100 of the present disclosure are described in more detail.

[0043] exist Figure 8 In the first embodiment of the brush portion 100 shown, each brush strand 110 may be bent into a U-shape, and the brush portion 100 may include a ring member 120 that is press-fitted into the brush press-fit groove 210 and is simultaneously fitted to the bent portion of the brush strand. Therefore, the ring member 120 and the brush press-fit groove 210 may support the center of each brush strand 110, and may support the brush strand 110 so as not to be separated from the brush press-fit groove 210 even when the motor shaft S rotates.

[0044] In addition, Fig. 9In the second embodiment of the brush portion 100 shown, the brush strand 110 may have one end connected to a predetermined position of the brush press-fit groove 210 and the other end offset in a rotation direction compared to the one end of the brush strand 110. That is, the brush strand 110 may have a helix angle. Here, one rotation direction may be opposite to the main rotation direction of the motor shaft S, which is a clockwise direction. That is, one rotation direction may be a counterclockwise direction. Therefore, when the motor shaft S rotates, the friction occurring between the brush strand 110 and the end cap E may be minimized, thereby preventing the brush strand 110 from separating from the brush press-fit groove 210.

[0045] In addition, the brush portion 100 in the second embodiment may include at least one brush assembly in which a plurality of brush strands 110 are aggregated. Some of the brush strands 110 included in the brush assembly may each include the other end offset in one rotational direction compared to one end of the brush strand, and each of the remaining brush strands 110 included in the brush assembly may include the other end offset in another rotational direction compared to one end of the brush strand.

[0046] In more detail, A:B refers to the ratio of the probability that the motor shaft S rotates in one rotation direction to the probability that the motor shaft S rotates in another rotation direction. Here, A:B may also preferably refer to the ratio of the probability that the brush strands 110 included in one brush assembly are biased in another rotation direction to the probability that the brush strands 110 included in one brush assembly are biased in one rotation direction. Therefore, even when the motor shaft S rotates in one rotation direction and another rotation direction, the corresponding brush strands 110 may each be arranged in the brush assembly at a predetermined ratio, thereby preventing the brush strands 110 from being separated from the brush press-fit groove 210 due to the friction occurring between the end caps E, and preventing the anti-corrosion performance from being reduced thereby.

[0047] In addition, if Fig.10 As shown, in the third embodiment of the brush portion 100, a plurality of brush strands 110 may be arranged in two or more rows in the radial direction. Here, the brush strands 110 may be made of a material having a higher wear and a higher conductivity under the same load as the brush strands 110 closer to the rotation axis of the motor shaft S. The reason is that when the brush strands 110 are away from the rotation axis of the motor shaft S, the brush strands 110 may have an increased linear rotation speed, increased friction, and a lower possibility of electric field movement. In this way, the material of the brush strands 110 in each row may be different depending on their distance from the rotation axis of the motor shaft S, thereby maintaining a more stable system and more smoothly inducing the electric field through the brush portion 100 and the end cap E.

[0048] Furthermore, when the press-fit fixing portion 200 is away from the rotation axis of the motor shaft S, the brush strands 110 in the third embodiment may preferably have a greater length extending outward in the axial direction. Therefore, when the brush strands 110 reach the outer row away from the rotation axis of the motor shaft S, the contact area between the brush portion 100 and the end cap E can be made wider, and an electric field having a certain value or more can be moved in all rows included in the brush portion 100, thereby maximizing the anti-corrosion performance.

[0049] As described above, the bearing with an anti-corrosion function of the present disclosure can ensure lower material cost and weight by adopting a smaller size compared with the prior art.

[0050] The bearing with an anti-corrosion function of the present disclosure can also ensure significantly reduced rotational friction, and is advantageous in terms of noise, vibration, and harshness (NVH) of a vehicle by making a conductive seal formed in a brush type contact the end cover and the rear cover in the axial direction.

[0051] The bearing with anti-corrosion function of the present disclosure can also ensure improved function of electric current by increasing the contact area obtained by adjusting the angle of the conductive seal.

[0052] The spirit of the present disclosure should not be interpreted as being limited to the above-mentioned embodiments. The present disclosure can be applied to various fields and can be variously modified by those skilled in the art without departing from the scope of the present disclosure. Therefore, the bearing 1000 with an anti-corrosion function and its variants can fall within the scope of the present disclosure, as long as the bearing and its variants are obvious to those skilled in the art.

Claims

1. A bearing with anti-corrosion function, characterized in that: The bearing with anti-corrosion function comprises: a brush portion, the brush portion comprising a plurality of brush strands; and a press-fit fixing portion to which the first end of the brush portion is coupled, and an outer surface of the press-fit fixing portion is press-fit fixed to an inner surface of one end of the motor shaft, wherein the brush portion has a first end coupled to the press-fit fixing portion and a second end in contact with an end cover of the motor, and The second end of the brush portion extends outward from one end of the press-fit fixing portion so that the end cover and the one end of the motor shaft are spaced apart from each other by a predetermined distance.

2. The bearing with anti-corrosion function according to claim 1, characterized in that: The press-fit fixing portion includes a brush press-fit groove formed inwardly in one surface of the press-fit fixing portion facing the end cover.

3. The bearing with anti-corrosion function according to claim 2, characterized in that: The brush press-fit groove is formed in a circle drawn around a rotation axis of the motor shaft, and a radial distance from the brush press-fit groove to the rotation axis decreases as the brush press-fit groove extends inward from the one surface of the press-fit fixing portion.

4. The bearing with anti-corrosion function according to claim 2, characterized in that: The brush press-fit groove is formed in a circle drawn around a rotation axis of the motor shaft, and a radial distance from the brush press-fit groove to the rotation axis increases as the brush press-fit groove extends inward from the one surface of the press-fit fixing portion.

5. The bearing with anti-corrosion function according to claim 1, characterized in that: The bearing with anti-corrosion function further includes a bent fixing portion, wherein the bent fixing portion extends from the one end of the press-fit fixing portion in a radial direction. Wherein, the curved fixing portion comprises: a bent portion that bends when a force is applied to a connection portion thereof with the press-fit fixing portion; and a fixing step protruding from an extended end of the bent fixing portion, and Wherein, an insertion groove is concavely formed in an outer surface of the motor shaft, and the insertion groove is coupled to the fixing step.

6. The bearing with anti-corrosion function according to claim 2, characterized in that: Each brush strand includes a bent portion bent into a U shape, and The brush portion includes a ring member that is press-fitted into the brush press-fit groove while being fitted onto the bent portion of the brush strand.

7. The bearing with anti-corrosion function according to claim 2, characterized in that: The brush strand has a first end coupled to a predetermined position of the brush press-fit recess and a second end offset in a rotational direction compared to the first end of the brush strand.

8. The bearing with anti-corrosion function according to claim 7, characterized in that: The brush portion includes at least one brush assembly, the plurality of brush strands are aggregated in the at least one brush assembly, The second end of each of some brush strands included in the brush assembly is offset in the one rotational direction relative to the first end of the corresponding brush strand, and The second end of each of the remaining brush strands included in the brush assembly is offset in a rotational direction opposite to the one rotational direction compared to the first end of the corresponding brush strand.

9. The bearing with anti-corrosion function according to claim 1, characterized in that: The plurality of brush strands are arranged in two or more rows along the radial direction, and Among the plurality of brush strands arranged in two or more rows in the radial direction, the brush strands disposed in a row closer to the rotation axis of the motor shaft are made of a material having a higher degree of wear and a higher conductivity under the same load.

10. The bearing with anti-corrosion function according to claim 9, characterized in that: When the press-fit fixing portion is away from the rotation axis of the motor shaft, the brush strands have a greater length extending outwardly in the axial direction.

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