CN115681306A

CN115681306A - Rotating shaft assembly

Info

Publication number: CN115681306A
Application number: CN202110871048.XA
Authority: CN
Inventors: 张衍军; 赵新超; 李贻伟; 王苗森; 孙祥善; 孙继义
Original assignee: Wolong Electric Jinan Motor Co ltd; Wolong Electric Group Co Ltd
Current assignee: Wolong Electric Jinan Motor Co ltd; Wolong Electric Drive Group Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2023-02-03

Abstract

The invention discloses a rotating shaft assembly and relates to the field of motors. In the outer rotor type blower adopting the sliding bearing, the permanent magnet has smaller volume and smaller attraction force to the rotating shaft due to size limitation, when the rotating shaft of the motor receives larger axial force, the phenomenon of axial movement can occur, and in severe cases, the rotating shaft can even be separated from the bearing. The anti-drop device comprises a base body, a shaft sleeve, a rotating shaft, a magnet, a thrust pad, a shock pad and a stop sleeve, wherein the shaft sleeve is embedded in the middle upper part of a cylindrical cavity, the stop sleeve is arranged at the lower part of the cylindrical cavity, the stop sleeve presses the magnet, the thrust pad and the shock pad, the rotating shaft is in rotating fit with the shaft sleeve, a surrounding neck groove is arranged at the lower end of the rotating shaft, and an anti-drop rib extends into the surrounding neck groove. Through the anti-disengaging structure that anticreep muscle and encircleing the neck groove and combine together, when the pivot was because of receiving the great axial force that surpasss magnet suction and axial float, the anticreep muscle can prevent effectively that the pivot from breaking away from in the bearing, has promoted the stability and the security of motor operation.

Description

Rotating shaft assembly

Technical Field

The invention relates to the field of motors, in particular to a rotating shaft assembly.

Background

At present, the air cooling frostless technology is more and more popularized in the field of refrigerators, and the air cooling effect is achieved by arranging an air feeder in the refrigerator and conveying circulating cold air into the refrigerator. Since the refrigerator is placed indoors and operates for a long time, the motor is required to operate quietly, so that people seek comfort.

In the outer rotor type blower using the sliding bearing, the rotating shaft located in the inner hole of the sliding bearing makes a rotational movement along the central axis, and at the same time, the rotating shaft also moves axially inside the sliding bearing, obviously, the latter is to be avoided, and the axial movement of the rotating shaft can cause the blower to generate vibration noise. Currently, researchers have proposed various measures to restrain axial movement of a rotating shaft.

In the above technology, although the permanent magnet can prevent the rotating shaft from moving in the axial direction, the permanent magnet has limited attraction force to the rotating shaft, especially in a refrigerator blower, because of size limitation, the permanent magnet is usually small in volume and small in attraction force to the rotating shaft, when the rotating shaft is subjected to a large axial force, the phenomenon of moving in the axial direction still occurs, and when the rotating shaft is seriously moved in the axial direction, the rotating shaft even can be separated from the bearing.

Disclosure of Invention

The technical problem to be solved and the technical task to be solved by the invention are to perfect and improve the prior technical scheme and provide a rotating shaft assembly for preventing the rotating shaft from axially shifting to cause separation from a bearing.

Therefore, the invention adopts the following technical scheme.

The utility model provides a rotating shaft assembly, includes base member, axle sleeve, pivot and magnet, the base member be equipped with lower extreme confined cylinder chamber, the axle sleeve inlay in the well upper portion in cylinder chamber, magnet locate the pivot cylinder intracavity under the tip, the pivot lower extreme from last pivot hole that down passes the axle sleeve and with axle sleeve normal running fit, the lower part in cylinder chamber be equipped with the locking cover, the pivot lower extreme be equipped with and encircle the neck groove, the locking cover be equipped with the anticreep muscle, the anticreep muscle inwards stretch into and encircle the neck inslot, the anticreep muscle and encircle and all have the clearance between the inner wall in neck groove at axial and radially. Through the anticreep muscle of locking cover and the anticreep structure that keeps off each other in the pivot axial that combines together around the neck groove, when the pivot when axial float appears because of receiving the great axial force that exceeds magnet suction, the anticreep muscle can prevent effectively that the pivot from breaking away from the bearing, has promoted the stability and the security of motor operation.

As a preferable technical means: a thrust pad is arranged between the lower end part of the rotating shaft and the magnet and is made of wear-resistant materials. The thrust pad prevents the direct contact between the rotating shaft and the magnet, ensures the service life of the magnet,

the thrust pad is made of wear-resistant materials, can effectively reduce wear after long-term rotary friction with the rotating shaft, and has good wear resistance.

As a preferable technical means: and a damping pad is arranged between the lower end of the magnet and the bottom surface of the cylindrical cavity of the matrix, and the damping pad is made of an elastic material. The shock pad can alleviate vibration, weakens the noise, adopts elastic material, and the shock attenuation is effectual.

As a preferable technical means: the stop sleeve is provided with an upper barrel cavity and a lower barrel cavity, the diameter of the lower barrel cavity is larger than that of the upper barrel cavity, the thrust pad, the magnet and the shock pad are arranged in the lower barrel cavity, and the sum of the heights of the thrust pad, the magnet and the shock pad is equal to the height of the lower barrel cavity or is tightly matched with the lower barrel cavity in the axial direction of the stop sleeve. The structure enables the stop sleeve to effectively press the thrust pad, the magnet and the shock pad, and prevents the thrust pad, the magnet and the shock pad from vibrating in the axial direction.

As a preferable technical means: the outer wall of the shaft sleeve is in interference fit with the inner wall of the cylindrical cavity of the base body. Can effectively realize the fixation between the shaft sleeve and the base body and has simple structure.

As a preferable technical means: a gap is arranged between the outer wall of the lower part of the shaft sleeve and the inner wall of the cylindrical cavity of the base body. Through setting up the clearance of take the altitude between axle sleeve and the base member, can effectively reduce the interference fit face between the two, reduce the assembly degree of difficulty.

As a preferable technical means: the upper end of the stop sleeve is attached to the lower end of the shaft sleeve, and the lower end of the stop sleeve is attached to the bottom surface of the cylindrical cavity. The fixing of the stop sleeve is effectively realized, and the axial movement of the stop sleeve is prevented.

As a preferable technical means: the anticreep muscle be located the upper end of locking cover, the anticreep muscle is a plurality of, encircles the equipartition. The anti-falling rib is arranged at the upper end of the stop sleeve, so that the extension length of the rotating shaft to the lower side of the shaft sleeve can be reduced, the integral axial height of the rotating shaft assembly is reduced, and the structure is compact.

As a preferable technical means: the inner wall of the cylindrical cavity is provided with a plurality of grooves, and the grooves axially penetrate through the whole cylindrical cavity. In the assembling process, air circulates through the grooves, and air resistance borne by parts during assembling is reduced.

As a preferable technical means: the upper end of the cylindrical cavity is provided with a surrounding step, the radial depth of the step is the same as or deeper than that of the groove, and the height position of the upper end of the shaft sleeve is lower than that of the upper end face of the base body. The assembly of the shaft sleeve is more convenient due to the larger step lateral clearance, and the height position of the upper end of the shaft sleeve is lower than that of the upper end of the base body, so that the shaft sleeve can be effectively protected, and the end part of the shaft sleeve is prevented from colliding with foreign objects.

Has the beneficial effects that:

1. through the anti-disengaging structure that anticreep muscle and encircleing the neck groove and combine together, when the axial float appeared because of receiving the great axial force that exceeds magnet suction in the pivot, the anticreep muscle can prevent effectively that the pivot from breaking away from in the bearing, has promoted the stability and the security of motor operation.

2. The arrangement of the shock pad can effectively reduce vibration and weaken noise; the thrust pad prevents direct contact between the rotating shaft and the magnet, and ensures the service life of the magnet.

3. The recess that the drum intracavity wall set up can make the air circulate through the recess in the assembling process, reduces the air resistance that receives when spare part assembles, the assembly of being convenient for.

4. The anti-falling ribs are arranged at the upper end of the stop sleeve, so that the extension length of the rotating shaft to the lower side of the shaft sleeve can be reduced, the overall axial height of the rotating shaft assembly is reduced, and the rotating shaft assembly is compact in structure.

Drawings

FIG. 1 is a schematic view of the radial cross-section structure of the present invention.

FIG. 2 is a schematic view of the structure of the substrate in the present invention.

Fig. 3 is a schematic view of the structure of the stop sleeve of the present invention.

FIG. 4 is a schematic radial cross-sectional view of a stop sleeve according to the present invention.

In the figure: 1. a shaft sleeve; 2. a substrate; 3. a stop sleeve; 4. a rotating shaft; 5. a magnet; 6. a thrust pad; 7. a shock pad; 201. a cylindrical cavity; 202. a groove; 203. a step; 301. preventing the ribs from falling off; 302. an upper barrel cavity; 303. a lower barrel cavity; 401. surrounding the neck groove.

Detailed Description

The technical scheme of the invention is further explained in detail by combining the drawings in the specification.

As shown in fig. 1-4, a rotating shaft assembly, including a base body 2, a shaft sleeve 1, a rotating shaft 4 and a magnet 5, the base body 2 is provided with a cylinder cavity 201 with a closed lower end, the shaft sleeve 1 is embedded in the middle upper part of the cylinder cavity 201, the magnet 5 is arranged in the cylinder cavity 201 below the lower end of the rotating shaft 4, the lower end of the rotating shaft 4 passes through a hole of the rotating shaft 4 of the shaft sleeve 1 from top to bottom and is in running fit with the shaft sleeve 1, the lower part of the cylinder cavity 201 is provided with a stop sleeve 3, the lower end of the rotating shaft 4 is provided with a surrounding neck groove 401, the stop sleeve 3 is provided with an anti-falling rib 301, the anti-falling rib 301 extends inwards into the surrounding neck groove 401, and a gap exists between the anti-falling rib 301 and the inner wall surrounding the neck groove 401 in the axial direction and the radial direction.

In order to ensure the service life of the magnet 5, a thrust pad 6 is arranged between the lower end part of the rotating shaft 4 and the magnet 5, and the thrust pad 6 is made of wear-resistant materials, preferably polyether-ether-ketone materials; the thrust pad 6 prevents that

pivot

4 and 5 direct contact of magnet guarantee 5 life-spans, and the thrust pad 6 adopts wear-resisting material, long-term 4 spin friction with the pivot, can effectively reduce wearing and tearing, and wear resistance is good.

For shock absorption and noise reduction, a shock absorption pad 7 is arranged between the lower end of the magnet 5 and the bottom surface of the cylindrical cavity 201 of the base body 2, and the shock absorption pad 7 is made of an elastic material, preferably a rubber material. The shock pad 7 can reduce vibration and weaken noise, and is made of elastic materials and good in shock absorption effect.

In order to prevent the thrust pad 6, the magnet 5 and the shock absorption pad 7 from vibrating in the axial direction, the stop sleeve 3 is provided with an upper cylinder cavity 302 and a lower cylinder cavity 303, the diameter of the lower cylinder cavity 303 is larger than that of the upper cylinder cavity 302, the thrust pad 6, the magnet 5 and the shock absorption pad 7 are arranged in the lower cylinder cavity 303, and the sum of the heights of the thrust pad 6, the magnet 5 and the shock absorption pad 7 is equal to the height of the lower cylinder cavity 303 or is tightly matched with the lower cylinder cavity 303 in the axial direction of the stop sleeve 3. This configuration allows the retaining sleeve 3 to effectively press the thrust pad 6, the magnet 5 and the damper pad 7, preventing the thrust pad 6, the magnet 5 and the damper pad 7 from vibrating in the axial direction.

In order to fix the shaft sleeve 1 and the base body 2, the outer wall of the shaft sleeve 1 is in interference fit with the inner wall of the cylindrical cavity 201 of the base body 2. Can effectively realize the fixation between the shaft sleeve 1 and the base body 2, and has simple structure.

In order to reduce the assembly difficulty, a gap is arranged between the outer wall of the lower part of the shaft sleeve 1 and the inner wall of the cylindrical cavity 201 of the base body 2. Through setting up the clearance of take the altitude between axle sleeve 1 and the base member 2, can effectively reduce the interference fit face between the two, reduce the assembly degree of difficulty.

In order to fix the stop sleeve 3, the upper end of the stop sleeve 3 is attached to the lower end of the shaft sleeve 1, and the lower end of the stop sleeve 3 is attached to the bottom surface of the cylindrical cavity 201. The fixing of the stop sleeve 3 is effectively realized, and the axial movement of the stop sleeve 3 is prevented.

In order to make the structure compact, the anti-dropping ribs 301 are located at the upper end of the stop sleeve 3, in this example, 3 anti-dropping ribs 301 are uniformly distributed around the stop sleeve. The anti-falling rib 301 is arranged at the upper end of the stop sleeve 3, so that the extension length of the rotating shaft 4 to the lower side of the shaft sleeve 1 can be reduced, the integral axial height of the rotating shaft assembly is reduced, and the structure is compact.

In order to reduce the air resistance when the parts are assembled, in this example, 3 grooves 202 are provided on the inner wall of the cylindrical cavity 201, and the grooves 202 axially penetrate through the entire cylindrical cavity 201. In the assembling process, air circulates through the groove 202, so that air resistance on assembly of parts is reduced, and assembly is facilitated.

For easier assembly, the upper end of the cylindrical cavity 201 is provided with a surrounding step 203, the radial depth of the step 203 is the same as that of the groove 202, and the upper end of the shaft sleeve 1 is lower than the upper end surface of the base body 2. Because great step 203 side clearance, the assembly of axle sleeve 1 of being more convenient for, the upper end high position of axle sleeve 1 is less than base member 2 upper end, can effectively protect axle sleeve 1, prevents that axle sleeve 1 tip from bumping with the foreign object, and in this example, the radial depth who encircles step 203 can adopt the size of being darker than recess 202 to replace.

Through the anticreep muscle 301 of locking cover 3 and the anticreep structure that keeps off each other in 4 axials of pivot that combine together around neck groove 401, when the motor operation, when pivot 4 appears the axial float because of receiving the great axial force that exceeds 5 suctions of magnet, anticreep muscle 301 can prevent effectively that pivot 4 from breaking away from the bearing, has promoted the stability and the security of motor operation, compares in traditional pivot subassembly structure, and this structure is safe and reliable more, and compact structure.

The above-described spindle assembly shown in fig. 1-4 is a specific embodiment of the present invention, and it has shown the outstanding substantive features and significant improvements of the present invention, and it is within the scope of the present invention to modify the same in shape, structure, etc. according to the practical needs.

Claims

1. The utility model provides a pivot subassembly, includes base member (2), axle sleeve (1), pivot (4) and magnet (5), base member (2) be equipped with lower extreme confined cylinder chamber (201), axle sleeve (1) inlay in the well upper portion in cylinder chamber (201), magnet (5) locate in cylinder chamber (201) under pivot (4) the tip down, pivot (4) lower extreme from last pivot (4) hole that down pass axle sleeve (1) and with axle sleeve (1) normal running fit, its characterized in that: the lower part of cylinder chamber (201) be equipped with stop sleeve (3), pivot (4) lower extreme be equipped with around neck groove (401), stop sleeve (3) be equipped with anticreep muscle (301), anticreep muscle (301) inwards stretch into around neck groove (401) in, anticreep muscle (301) and the inner wall around neck groove (401) between all have the clearance in axial and radial.

2. A spindle assembly as claimed in claim 1, in which: a thrust pad (6) is arranged between the lower end part of the rotating shaft (4) and the magnet (5), and the thrust pad (6) is made of wear-resistant materials.

3. A spindle assembly as claimed in claim 2, in which: and a damping pad (7) is arranged between the lower end of the magnet (5) and the bottom surface of the cylindrical cavity (201) of the matrix (2), and the damping pad (7) is made of an elastic material.

4. A spindle assembly as claimed in claim 3, wherein: the stop sleeve (3) be equipped with section of thick bamboo chamber (302) and lower section of thick bamboo chamber (303), the diameter of lower section of thick bamboo chamber (303) be greater than section of thick bamboo chamber (302) on, thrust pad (6), magnet (5), shock pad (7) locate down in section of thick bamboo chamber (303), and the high sum of thrust pad (6), magnet (5) and shock pad (7) equals down section of thick bamboo chamber (303) height, perhaps in the axial of stop sleeve (3) with down section of thick bamboo chamber (303) tight fit.

5. A spindle assembly as claimed in claim 4, wherein: the outer wall of the shaft sleeve (1) is in interference fit with the inner wall of the cylindrical cavity (201) of the base body (2).

6. A spindle assembly as claimed in claim 5, in which: a gap is arranged between the outer wall of the lower part of the shaft sleeve (1) and the inner wall of the cylindrical cavity (201) of the base body (2).

7. A spindle assembly as claimed in claim 6, wherein: the upper end of the stop sleeve (3) is attached to the lower end of the shaft sleeve (1), and the lower end of the stop sleeve (3) is attached to the bottom surface of the cylindrical cavity (201).

8. A spindle assembly as claimed in claim 7, wherein: the anti-dropping ribs (301) are located at the upper end of the stop sleeve (3), and the anti-dropping ribs (301) are distributed uniformly in a surrounding mode.

9. A spindle assembly as claimed in claim 1, wherein: the inner wall of the cylindrical cavity (201) is provided with a plurality of grooves (202), and the grooves (202) axially penetrate through the whole cylindrical cavity (201).

10. A spindle assembly as claimed in claim 9, in which: the upper end of the cylindrical cavity (201) is provided with a surrounding step (203), the radial depth of the step (203) is the same as that of the groove (202) or is deeper than that of the groove (202), and the height position of the upper end of the shaft sleeve (1) is lower than that of the upper end surface of the base body (2).