Motor structure

Abstract

The utility model relates to a motor structure, which comprises a casing, a base, a stator core, a rotating shaft, a bearing sleeve, a first bearing, a spring and a second bearing, outer rings of the first bearing and the second bearing are coaxially mounted in the bearing sleeve, inner rings of the first bearing and the second bearing are fixed on the rotating shaft, and the first bearing and the second bearing are coaxially mounted in the bearing sleeve. And the spring is mounted between the first bearing and the second bearing. Compared with the prior art, the utility model has the advantages of high mechanical assembly precision, easiness in assembly, low vibration noise, compact structure and the like.

Description

Technical Field

[0001] The utility model relates to a mechanical transmission mechanism, in particular to a motor structure. Background Art

[0002] Existing motors generally include rotor components, stator components, end covers, bearings, etc. Existing motors have the following problems:

[0003] 1) When the bearings are installed coaxially, the bearing chamber ends are preloaded and a shoulder is required between the two bearings. Due to the influence of the shoulder, there is an inherent concentricity deviation between the two bearing chambers, a fixed angular deviation in the mechanical installation, and an unstable contact area between the steel balls and raceways inside the bearings, which affects the vibration noise, life and stability of the bearings.

[0004] 2) The preload system of conventional motor bearing structure is subject to the limitations of multiple parts, with large tolerance accumulation and large fluctuation of preload force;

[0005] 3) There are differences in the materials of the bearing chamber and the bearing itself, and there are differences in the thermal expansion coefficients. The bearings are easily damaged and produce abnormal noise when the motor works at high and low temperatures;

[0006] 4) The motor assembly process is cumbersome, the risk of bearing damage is high, and the production defect rate is high;

[0007] 5) The bearings are not installed on the same axis, the parallelism of the rotor relative to the stator is unstable, and the rotor end face runout is unstable;

[0008] 6) Additional holes are required at the bottom of the end cover for shaft installation, which increases the instability of subsequent sealing.

[0009] After searching, Chinese patent publication number CN211429054U discloses a self-calibration structure for the concentricity of a motor bearing, which specifically discloses that it includes a housing and a bearing assembly that is detachably fixed to the end of the housing; the bearing assembly includes a bearing sleeve, a bearing and a spring; a through hole with a diameter not greater than the outer diameter of the bearing is formed on the spring, and is coaxially fixed to the bearing sleeve. However, the existing motor structure does not solve the above technical problems.

[0010] Therefore, how to provide a motor that is easy to assemble, has low vibration and noise, and has a compact structure, thereby eliminating the influence of bearing assembly concentricity and improving product rotation accuracy has become a technical problem that needs to be solved. Utility Model Content

[0011] The purpose of the utility model is to overcome the defects of the above-mentioned prior art and provide a motor structure with high mechanical assembly accuracy, easy assembly, low vibration and noise, and compact structure, which can eliminate the influence of bearing assembly concentricity to a certain extent and improve the rotation accuracy of the product.

[0012] The purpose of the utility model can be achieved through the following technical solutions:

[0013] According to one aspect of the utility model, a motor structure is provided, including a casing, a base, a stator core and a rotating shaft. The motor structure also includes a bearing sleeve, a first bearing, a spring and a second bearing. The outer rings of the first bearing and the second bearing are coaxially installed in the bearing sleeve, the inner rings of the first bearing and the second bearing are fixed on the rotating shaft, and the spring is installed between the first bearing and the second bearing.

[0014] As a preferred technical solution, a sleeve is provided between the spring and the rotating shaft to limit the height of the spring after compression.

[0015] As a preferred technical solution, a first gasket is provided between the spring and the first bearing.

[0016] As a preferred technical solution, a second gasket is provided between the spring and the second bearing.

[0017] As a preferred technical solution, one end of the rotating shaft is fixed to the casing by glue.

[0018] As a preferred technical solution, the other end of the rotating shaft is fixed by a retaining spring for axial limitation.

[0019] As a preferred technical solution, the stator core is fixed to the base by glue.

[0020] As a preferred technical solution, the motor structure further includes a magnetic ring, and a yoke is provided between the magnetic ring and the casing.

[0021] As a preferred technical solution, the base adopts an integrated sealing structure.

[0022] As a preferred technical solution, an air guide hole is provided inside the rotating shaft.

[0023] Compared with the prior art, the utility model has the following advantages:

[0024] 1) The two bearings of the utility model are assembled in the bearing sleeve at the same time, and there is no concentricity error in the bearing assembly;

[0025] 2) The preload of the bearing system of the utility model can be very stable, and the compression of the spring system can be very stable;

[0026] 3) The parallelism of the rotor end face relative to the base is guaranteed to the greatest extent, and the relative accuracy of the stator and rotor can be guaranteed by controlling a few indicators, thereby improving the vertical installation accuracy of the shaft system;

[0027] 4) The utility model is flexible in assembly, and one set of solutions can realize positioning preloading and constant pressure preloading;

[0028] 5) The utility model increases the air guide hole on the rotating shaft to prevent improper installation during installation;

[0029] 6) The bottom of the base of the utility model can be made into an integrated type to prevent subsequent glue dispensing and sealing problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the utility model;

[0031] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0032] Figure 3 The utility model is a partial cross-sectional view of the structure Figure 1 ;

[0033] Figure 4 The utility model is a partial cross-sectional view of the structure Figure 2 ;

[0034] Among them, 1 is a bearing sleeve, 2 is a first bearing, 3 is a first gasket, 4 is a spring, 5 is a shaft sleeve, 6 is a second gasket, 7 is a housing, 8 is a yoke, 9 is a magnetic ring, 10 is a second bearing, 11 is a rotating shaft, 12 is a retaining spring, 13 is a stator core, 14 is a base, and 15 is an FPC. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0036] like Figure 1 and Figure 2 As shown, a motor structure includes a housing 7, a base 14, a stator core 13 and a rotating shaft 11. The motor structure also includes a bearing sleeve 1, a first bearing 2, a spring 4 and a second bearing 10. The outer rings of the first bearing 2 and the second bearing 10 are coaxially installed in the bearing sleeve 1, the inner rings of the first bearing 2 and the second bearing 10 are fixed on the rotating shaft 11, and the spring 4 is installed between the first bearing 2 and the second bearing 10.

[0037] That is, the two outer rings of the bearings of the utility model are coaxially installed in the bearing sleeves of the same reference, and the inner rings are fixed on the rotating shaft 11 of the same reference. The fixing method of the inner and outer rings of the bearings eliminates the influence of eccentricity.

[0038] like Figure 3As shown, a sleeve 5 is provided between the spring 4 and the rotating shaft 11 to limit the height of the spring 4 after compression, so that the working elastic force value of the spring is relatively stable.

[0039] A first gasket 3 is provided between the spring 4 and the first bearing 2, and a second gasket 6 is provided between the spring 4 and the second bearing 10. By adding gaskets on both sides of the spring, the stress state inside the bearing is improved;

[0040] One end of the rotating shaft 11 is fixed to the housing 7 by glue, so as to ensure that the rotating shaft and the housing are relatively vertical. The other end of the rotating shaft 11 is fixed by a retaining spring 12 for axial limitation.

[0041] The stator core 13 is fixed to the base 14 by glue. The motor structure further comprises a magnetic ring 9, a yoke 8 is arranged between the magnetic ring 9 and the housing 7, and the yoke 8 is added between the housing 7 and the magnetic ring 9 to improve the electromagnetic performance.

[0042] The base 14 adopts an integrated sealing structure to avoid additional secondary sealing.

[0043] like Figure 4 As shown, the rotating shaft 11 is a smooth axis without steps, and an air guide hole is arranged inside to avoid the influence of internal air pressure and the rotor cannot be assembled properly.

[0044] The inner and outer rings of the utility model bearing are coaxially installed to ensure assembly concentricity; the bearing system is fixed on the rotor and together with the rotor forms a rotor assembly; the bearing sleeve and the supporting system are made of the same material (bearing sleeve, shaft, bearing and sleeve); the bearings can be preloaded by springs or preloaded by positioning, and one structure can achieve two preload methods; the spring compression amount is limited by the sleeve, and the compression height is highly consistent; the housing and the shaft are fixed by glue to ensure the relative verticality of the shaft and the housing; gaskets are added on both sides of the spring to improve the internal stress state of the bearing;

[0045] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A motor structure, comprising a housing (7), a base (14), a stator core (13) and a rotating shaft (11), characterized in that: The motor structure further comprises a bearing sleeve (1), a first bearing (2), a spring (4) and a second bearing (10); the outer rings of the first bearing (2) and the second bearing (10) are coaxially mounted in the bearing sleeve (1); the inner rings of the first bearing (2) and the second bearing (10) are fixed on a rotating shaft (11); and the spring (4) is mounted between the first bearing (2) and the second bearing (10).

2. A motor structure according to claim 1, characterized in that: A shaft sleeve (5) is provided between the spring (4) and the rotating shaft (11) and is used to limit the height of the spring (4) after compression.

3. A motor structure according to claim 1, characterized in that: A first gasket (3) is provided between the spring (4) and the first bearing (2).

4. A motor structure according to claim 1, characterized in that: A second gasket (6) is provided between the spring (4) and the second bearing (10).

5. The motor structure according to claim 1, characterized in that: One end of the rotating shaft (11) is fixed to the casing (7) by glue.

6. A motor structure according to claim 5, characterized in that: The other end of the rotating shaft (11) is fixed by a retaining spring (12) to limit the axial direction.

7. The motor structure according to claim 1, characterized in that: The stator core (13) is fixed to the base (14) by glue.

8. The motor structure according to claim 1, characterized in that: The motor structure also includes a magnetic ring (9), and a magnetic yoke (8) is provided between the magnetic ring (9) and the casing (7).

9. The motor structure according to claim 1, characterized in that: The base (14) adopts an integrated sealing structure.

10. The motor structure according to claim 1, characterized in that: An air guide hole is provided inside the rotating shaft (11).

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