CN221120634U - Arc-resistant motor shaft - Google Patents

Abstract

The utility model relates to an arc-resistant motor shaft, which comprises a shaft body, wherein a connecting position is formed on the shaft body and is used for being sleeved and matched with a bearing, the connecting position comprises a ceramic part coated on the shaft body, and the ceramic part is an alumina layer. The shaft body is provided with two connecting positions which are used for being sleeved and matched with the bearing, and the connecting positions are sprayed with an alumina layer, so that a more wear-resistant foundation is provided for the combination between the connecting positions and the bearing, and the service life is prolonged; more importantly, the aluminum oxide layer has good insulativity, and can well eliminate electric arcs generated in the running process of the direct current motor, so that grease in the bearing is protected from being broken down by the electric arcs, the bearing has longer service life, meanwhile, the damage of the electric arcs to circuit board elements can be eliminated, and the unified protection effect on a motor shaft, the bearing and the circuit board is achieved.

Description

Arc-resistant motor shaft

Technical Field

The utility model relates to the technical field of motor shafts, in particular to an arc-resistant motor shaft.

Background

The motor shaft is a power output part on a motor or a fan, needs to bear higher rotating speed and torque, and generally needs to have super-strong wear resistance and strength.

The utility model of application number CN201821934720.5 provides a motor shaft, which comprises a motor shaft main body, wherein one end of the motor shaft main body is connected with a sensor seat, the sensor seat is used for being connected with a sensor, and the motor shaft main body and the sensor seat are connected and fixed in a welding mode. According to the motor shaft, the motor shaft main body and the sensor seat are connected in a welding mode, so that the matching is more reliable, the motor shaft main body is processed into one-time processing, the combination tolerance is avoided, the overall accuracy is higher, the processing requirements of the shaft and the hole at the matching position are reduced, and the processing cost is reduced.

According to the existing motor shaft disclosed by the invention, as the connection position of the motor shaft and the bearing does not have the insulation property, the arc generated by the direct current motor during working can break down grease in the bearing, the damage of the arc to other components can be generated, and meanwhile, the wear resistance is poor.

Disclosure of utility model

The utility model aims to provide an arc-resistant motor shaft which comprises a shaft body, wherein a connecting position is formed on the shaft body and is used for being in sleeve joint fit with a bearing, the connecting position comprises a ceramic part coated on the shaft body, and the ceramic part is an alumina layer.

In the utility model, a further embodiment is that the connecting position comprises a groove formed on the shaft body in a circumferential direction, and the aluminum oxide layer is sprayed on the groove.

In the present utility model, a further embodiment is that the alumina layer and the shaft body are the same outer circular surface.

In a further embodiment of the present utility model, the connection locations are axially spaced apart from each other along the shaft body.

In the utility model, a further embodiment is that the center of the first end of the shaft body is provided with a screw hole.

In a further embodiment of the present utility model, the first end of the shaft body has a chamfer formed thereon.

In a further embodiment of the present utility model, the chamfer forms an angle of 142.43 ° with the axis of the shaft.

In the utility model, the shaft body is made of one of 45 # steel, 20Cr, 40Cr or SUS420 stainless iron.

The arc-resistant motor shaft has the following beneficial effects:

The shaft body is provided with two connecting positions which are used for being sleeved and matched with the bearing, the connecting positions are sprayed with ceramic parts, the ceramic parts are actually alumina layers, a more wear-resistant foundation is provided for the combination between the connecting positions and the bearing, and the service life is prolonged; more importantly, the aluminum oxide layer has good insulativity, and can well eliminate electric arcs generated in the running process of the direct current motor, so that grease in the bearing is protected from being broken down by the electric arcs, the bearing has longer service life, meanwhile, the damage of the electric arcs to circuit board elements can be eliminated, and the unified protection effect on a motor shaft, the bearing and the circuit board is achieved.

Drawings

FIG. 1 is a schematic diagram of an arc-resistant motor shaft according to the present utility model;

FIG. 2 is an enlarged schematic view of the position E in FIG. 1;

Fig. 3 is a sectional view of fig. 1 along direction D.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

As shown in fig. 1, the utility model provides an arc-resistant motor shaft, which comprises a shaft body 1, wherein a connecting position 2 is formed on the shaft body 1 and is used for being in sleeve joint fit with a bearing, and the two connecting positions 2 are axially arranged at intervals along the shaft body 1.

As shown in fig. 2, a screw hole 1B is formed in the center of the first end 1A of the shaft body 1, the screw hole 1B is used for fastening connection with a motor or a fan, a chamfer surface 1C is formed on the first end 1A of the shaft body 1, a 142.43 ° included angle is formed between the chamfer surface 1C and the axis of the shaft body 1, and fastening fit connection between a motor shaft and the motor or between the motor and the fan can be ensured under the fit of the chamfer surface 1C.

The shaft body 1 is made of one of 45 # steel, 20Cr, 40Cr or SUS420 stainless iron.

It should be noted that, as shown in fig. 3, the connection location 2 includes a ceramic portion coated on the shaft body 1, where the ceramic portion is an alumina layer 2A, so that the combination between the connection location 2 and the bearing provides a more wear-resistant foundation, and the service life is prolonged.

Specifically, the connection position 2 includes a groove formed on the shaft body 1 in a circumferential direction, and the alumina layer 2A is sprayed on the groove. When in processing, firstly, the shaft body 1 is subjected to heat treatment to ensure that the surface hardness of the shaft body is satisfactory, a groove is machined at the connecting position 2 on the shaft body 1, then an aluminum oxide layer 2A is sprayed at the position of the groove at the connecting position 2, then the outer circular surface of the shaft body 1 is machined to be flat, the surface roughness is controlled within 0.8 mu m, and the aluminum oxide layer 2A and the shaft body 1 are kept to be the same outer circular surface, namely the diameter of the shaft body 1 is consistent with the diameter of the aluminum oxide layer 2A.

After the completion of the processing, the roughness of the alumina layer 2A and the outer circumferential surface portion of the shaft body 1 excluding the alumina layer 2A was controlled to be 0.8 μm or less.

After the aluminum oxide layer 2A is sprayed, a hardness test is needed, the withstand voltage of the ceramic end in the ceramic plating process is 600VAC/50Hz, the ceramic end is ensured not to be broken down by the cover voltage within one minute, no electric spark flicker exists, the leakage current cannot exceed 5 mA, the insulation resistance is more than or equal to 5MΩ at 500VDC, and the hardness of the ceramic part is more than or equal to HRC60, which is a product of over-closing.

After the aluminum oxide layer 2A is sprayed, the bonding strength with the shaft body 1 is measured by a high-low temperature impact test, the high-low temperature switching is carried out between a temperature range of minus 40 ℃ and 155 ℃, the temperature is kept for one hour at minus 40 ℃ and the temperature is kept for one hour at 155 ℃, the switching time is kept within 1 minute each time, the cycle is carried out for 10 times, and the ceramic after the test is qualified after no crack and no insulation resistance reduction.

It can be understood that the surface of the machined shaft body 1 should be smooth, free of defects such as knocks and scratches, and finally the surface is coated with rust preventive oil, so that the rust preventive capability is improved, and the manufactured motor shaft has high wear resistance and high corrosion resistance.

More importantly, as the two connecting positions 2 are in an insulating state, electric arcs generated in the running process of the direct current motor can be well eliminated, so that grease in the bearing is protected from being broken down by the electric arcs, the bearing has longer service life, meanwhile, the damage of the electric arcs to circuit board elements can be eliminated, and the unified protection effect on a motor shaft, the bearing and the circuit board is achieved.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Claims (8)

1. An arc resistant motor shaft, characterized by: the shaft body is provided with a connecting position which is used for being sleeved and matched with the bearing, the connecting position comprises a ceramic part coated on the shaft body, and the ceramic part is an alumina layer.

2. The arc resistant motor shaft of claim 1 wherein: the connecting position comprises a groove formed on the shaft body in a circumferential direction, and the aluminum oxide layer is sprayed on the groove.

3. The arc resistant motor shaft of claim 2 wherein: the alumina layer and the shaft body are the same outer circular surface.

4. The arc resistant motor shaft of claim 1 wherein: the connecting positions are axially arranged at intervals along the shaft body.

5. The arc resistant motor shaft of claim 1 wherein: the center of the first end of the shaft body is provided with a screw hole.

6. The arc resistant motor shaft of claim 1 wherein: a chamfer surface is formed on the first end of the shaft body.

7. The arc resistant motor shaft of claim 6 wherein: an included angle of 142.43 degrees is formed between the chamfer surface and the axis of the shaft body.

8. The arc resistant motor shaft of claim 1 wherein: the shaft body is made of one of 45 # steel, 20Cr, 40Cr or SUS420 stainless iron.