CN216981680U

CN216981680U - Sealing structure of inner rotor motor shaft and motor

Info

Publication number: CN216981680U
Application number: CN202122994528.3U
Authority: CN
Inventors: 刘一凡
Original assignee: Guangzhou Leichen Electromechanical Technology Co ltd
Current assignee: Guangzhou Leichen Electromechanical Technology Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-07-15
Anticipated expiration: 2031-11-30

Abstract

The utility model relates to the technical field of motors and discloses a sealing structure of an inner rotor motor shaft and a motor, wherein the sealing structure of the inner rotor motor shaft comprises a rotating shaft, a bearing, a shell and a sealing ring, wherein the shell is provided with a mounting hole; a first groove is arranged between the bearing and the rotating shaft, the first groove is circumferentially arranged along the inner ring of the bearing, and sealant is filled in the first groove; the bearing with be equipped with the second recess between the mounting hole, first recess is followed bearing inner race circumference sets up, the sealing washer is located in the second recess. The sealing structure of the inner rotor motor shaft of the embodiment has good sealing effect, the shell and the bearing can not be damaged during dismounting, the maintenance is convenient, the service life of the bearing and the motor can be prolonged, and the cost is low.

Description

Sealing structure of inner rotor motor shaft and motor

Technical Field

The utility model relates to the technical field of motors, in particular to a sealing structure of an inner rotor motor shaft and a motor.

Background

For motors with higher protection level requirements, the motor shaft needs to be sealed. The current sealing schemes for motor shafts include the following:

1. adopt the skeleton oil blanket to protect sealed, this kind of sealing method has following defect: (1) the framework oil seal is high in price, so that the cost of the motor can be increased, and the price advantage of the product can be reduced; (2) after the framework oil seal is added, the corresponding installation position of the motor needs to be correspondingly added, and the overall axial size and the overall mass of the motor can be obviously increased.

2. The sealing glue is coated on the inner ring and the outer ring of the bearing, and the sealing mode has the following defects: (1) after the sealant is dried, the adhesive force is strong, even if the sealant can be forcedly disassembled, the damage to the shell or the bearing is certainly caused, and the sealant attached to the wall surface of the bearing chamber of the shell is difficult to treat and recycle, so that the disassembly and maintenance work is not facilitated; (2) the sealant is easily and unevenly coated and cannot form a closed sealing ring.

SUMMERY OF THE UTILITY MODEL

The utility model provides a sealing structure of an inner rotor motor shaft and a motor, and aims to solve the technical problems of high sealing cost, large mass, inconvenience in disassembly, assembly and maintenance and the like in the prior art.

In order to solve the technical problem, the utility model provides a sealing structure of an inner rotor motor shaft, which comprises a rotating shaft, a bearing, a shell and a sealing ring, wherein the shell is provided with a mounting hole;

a first groove is formed between the bearing and the rotating shaft, the first groove is arranged along the circumferential direction of the bearing inner ring, and sealant is filled in the first groove;

the bearing with be equipped with the second recess between the mounting hole, the second recess is followed bearing inner race circumference sets up, the sealing washer is located in the second recess.

Optionally, the first groove is provided on the rotating shaft.

Optionally, the number of the first grooves is two.

Optionally, the cross section of the first groove is square.

Optionally, the width of the first groove is 0.5mm to 2mm, and the depth of the first groove is 0.05mm to 0.2 mm.

Optionally, the second groove is formed in a side wall of the mounting hole.

Optionally, the sealing ring is an O-ring, and the second groove is adapted to the O-ring.

Optionally, the bearing is a waterproof bearing.

Optionally, the housing is provided with two mounting holes, and the bearing is respectively arranged between each mounting hole and the rotating shaft.

The utility model also provides a motor which comprises a stator component, a rotor coil and the sealing structure of the inner rotor motor shaft, wherein the stator component is arranged in the shell, the rotor coil is arranged on the rotating shaft, and the positions of the rotor coil and the stator component correspond to each other.

Compared with the prior art, in the sealing structure of the inner rotor motor shaft, the first groove is formed between the bearing inner ring and the rotating shaft, the sealant is coated in the first groove during installation, the sealant can be automatically filled into the first groove, a closed sealing ring can be formed, and the sealing effect is good. Through setting up the second recess between the mounting hole of bearing inner race and shell, install the sealing washer in the second recess, because the extrusion of bearing inner race for the sealing washer has certain "adhesion," but "adhesion" is not very strong, can prevent that bearing "from running the outer lane", during the dismouting, can not damage shell and bearing, and the maintenance of being convenient for can improve the life of bearing and motor. The cost of the sealing ring and the sealant is very low, for example, the cost of about ten yuan is needed by adopting framework sealing, and the cost of only a few cash is needed by adopting the sealing ring and the sealant. After the installation, the sealing washer is all very little with sealed size and quality of gluing, can not increase the holistic size of motor and quality, can improve the product competitiveness of motor.

The motor of the present invention also has the above advantages, which are not described in detail herein.

Drawings

One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.

Fig. 1 is a sectional view of a seal structure of an inner rotor motor shaft in an embodiment of the present application, that is, an enlarged view at a reference portion a in fig. 3.

Fig. 2 is an exploded view of the motor in the embodiment of the present application.

Fig. 3 is a sectional view of the motor in the embodiment of the present application.

Detailed Description

The embodiments of the present application will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad embodiments of the present application. It should be further noted that, for convenience of description, only some structures related to the embodiments of the present application are shown in the drawings, not all of the structures are shown.

Furthermore, the terms first, second, third and the like in the description and in the claims, are used for descriptive purposes only to distinguish one element from another, and are not to be construed as indicating or implying relative importance or implying any order or order to the indicated elements. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Similarly, the terms "fixed" and "connected," as used in the description and claims, are not to be construed as limited to direct connection. Thus, the expression "device a is connected to device B" should not be limited to devices or systems in which device a is directly connected to device B, meaning that there is a path between device a and device B, which may be a path including other devices or tools.

Referring to fig. 1, an embodiment of the present invention provides a sealing structure 100 for an inner rotor motor shaft, including a rotating shaft 10, a bearing 20, a housing 30 and a sealing ring 40, wherein a mounting hole 32 is formed in the housing 30, the bearing 20 is sleeved on the rotating shaft 10, the bearing 20 is located in the mounting hole 32, and the sealing ring 40 is mounted between the bearing 20 and the mounting hole 32;

a first groove 50 is formed between the bearing 20 and the rotating shaft 10, the first groove 50 is circumferentially arranged along the inner ring of the bearing 20, and sealant is filled in the first groove 50;

a second groove 60 is arranged between the bearing 20 and the mounting hole 32, the second groove 60 is arranged along the circumferential direction of the outer ring of the bearing 20, and the sealing ring 40 is positioned in the second groove 60.

In the sealing structure 100 of the inner rotor motor shaft described in this embodiment, by arranging the first groove 50 between the inner ring of the bearing 20 and the rotating shaft 10, during installation, sealant is coated in the first groove 50, and the sealant can be automatically filled in the first groove 50, so that a closed sealing ring can be formed, and the sealing effect is good. Through setting up second recess 60 between the mounting hole 32 of bearing 20 outer lane and shell 30, install sealing washer 40 in second recess 60, sealing washer 40 has certain "adhesion owing to assemble extrusion deformation back, but" adhesion "is not very strong, can prevent bearing 20" run the outer lane ", during the dismouting, can not damage shell 30 and bearing 20, the maintenance of being convenient for can improve the life of bearing 20 and motor. The cost of the sealing ring 40 and the sealant in this embodiment is very low, for example, the cost of using the framework for sealing needs about ten yuan, and the cost of using the sealing ring 40 and the sealant in this embodiment only needs a few money. After the installation, the sealing washer 40 and sealed size and the quality of gluing are all very little, can not increase the holistic size of motor and quality, can improve the product competitiveness of motor. Wherein, the outer race means that the non-rotating ring of the bearing rotates. The seal ring 40 is a rubber ring, etc., and other seal rings 40 may be used.

The first groove 50 may be formed on the rotating shaft 10 or on the inner ring of the bearing 20. In one embodiment, the first groove 50 is formed on the rotating shaft 10. When the first groove 50 is formed in the rotating shaft 10, the machining cost is lower, and the installation difficulty is lower. Preferably, the inner ring of the bearing 20 is in interference fit with the rotating shaft 10, and the sealant can be intensively filled into the first groove 50 in the assembling process, so that the sealant can form a sealing ring between the inner ring of the bearing 20 and the rotating shaft 10 better, the sealing effect is better, and the interference fit and the sealing mode of the sealant are matched.

In one embodiment, the number of the first grooves 50 is two. During assembly, first, the sealant is uniformly applied to the positions of the two first grooves 50, and then the bearing 20 is sleeved on the rotating shaft 10, so as to form an inner ring seal of the bearing 20. The first groove 50 enables the sealant to form a closed sealing ring more uniformly, and the two first grooves 50 enable the sealing effect to be better and the cost performance to be higher.

In an embodiment, the cross section of the first groove 50 is square, and the cross section of the first groove 50 may also be processed into other shapes, but when the cross section of the first groove 50 is square, the processing can be completed only once along the circumferential direction of the rotating shaft 10, so that the processing is more convenient, and the processing cost is lower.

In one embodiment, the width of the first groove 50 is 0.5mm to 2mm, and the depth of the first groove 50 is 0.05mm to 0.2 mm. The space occupied by the sealant is smaller than that occupied by the sealing ring 40, so that the size of the first groove 50 is smaller, and the strength of the rotating shaft 10 is not affected by the first groove 50. Specifically, in one embodiment, the width of the first groove 50 is 1mm, and the depth of the first groove 50 is 0.1 mm.

The second groove 60 may be provided in the sidewall of the mounting hole 32 or in the outer race of the bearing 20. In one embodiment, the second groove 60 is formed in the sidewall of the mounting hole 32, which can reduce the cost and the difficulty of installation. Preferably, the outer ring of the bearing 20 is in clearance fit with the mounting hole 32, and after the mounting hole 32 and the outer ring of the bearing 20 are in extrusion sealing through the sealing ring 40, the friction force of the outer ring of the bearing 20 is increased, so that the problem of ring runout of the bearing 20 can be effectively prevented, and the service life of the bearing 20 and the motor is prolonged. Meanwhile, the bearing 20 and the housing 30 can be easily separated during maintenance and disassembly, and the bearing 20 and the housing 30 are not damaged.

The cross section of the sealing ring 40 can be square, O-shaped or other shapes. If the cross section of the seal ring 40 is square, a surface seal is easily formed between the seal ring 40 and the bearing 20 and the mounting hole 32. In one embodiment, the seal ring 40 is an O-ring, and the second groove 60 is adapted to the O-ring. Line sealing is easily formed between the O-shaped sealing ring and the bearing 20 and between the O-shaped sealing ring and the mounting hole 32, and the sealing effect of the line sealing is better than that of the surface sealing.

The electric wheelchair is compatible with indoor and outdoor conditions in use environment, and water drops can splash to a motor of the electric wheelchair due to wading. In order to enable the motor to be stable for a long time and provide power for the electric wheelchair safely and reliably, the motor of the electric wheelchair adopts a sealing structure of a motor shaft of an inner rotor in the embodiment, and the electric wheelchair has a strong forced sealing effect. Further, in an embodiment, the bearing 20 is a waterproof bearing, which has a certain waterproof function, and can make the motor have stronger adaptability.

Referring to fig. 2, in an embodiment, two mounting holes 32 are formed in the housing 30, and the bearing 20 is respectively disposed between each mounting hole 32 and the rotating shaft 10. Specifically, the housing 30 includes a casing 34 and a rear cover 36, the casing 34 is connected to the rear cover 36, and the casing 34 and the rear cover 36 are respectively provided with a mounting hole 32. During assembly, the seal ring 40 is first placed in the second seal groove 60 of the housing 34, and then the seal ring 40 is placed in the second groove 60 of the rear end cap 36. The rotating shaft 10 with the bearing 20 is firstly installed into the casing 34, so that the bearing 20 is attached to the side wall and the end face of the installation hole 32 on the casing 34. The rear end cap 36 is then assembled with the housing 34 along the axis of the spindle 10. At this time, the outer race of the bearing 20 is fitted to the side wall of the mounting hole 32 in the rear end cover 36. The outer ring of the bearing 20 and the seal ring 40 form a compression seal, respectively.

Referring to fig. 3, an embodiment of the present invention further provides a motor 1000, which includes a stator assembly 200, a rotor core (not shown), and the sealing structure 100 of the inner rotor motor shaft, wherein the stator assembly 200 is installed in the housing 30, the rotor core is installed on the rotating shaft 10, and the rotor core and the stator assembly 200 are located correspondingly. The rotor core and the rotating shaft 10 form a rotor assembly of the motor, and after the rotor assembly is powered on, the rotor assembly rotates relative to the stator assembly 200.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the utility model, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing structure of an inner rotor motor shaft is characterized by comprising a rotating shaft, a bearing, a shell and a sealing ring, wherein the shell is provided with a mounting hole;

2. The seal structure of an inner rotor motor shaft of claim 1, wherein said first groove is provided on said shaft.

3. The seal structure of an inner rotor motor shaft of claim 1, wherein the number of the first grooves is two.

4. The seal structure of an inner rotor motor shaft of claim 1, wherein the first groove is square in cross-section.

5. The seal structure of an inner rotor motor shaft according to claim 4, wherein the width of the first groove is 0.5mm to 2mm, and the depth of the first groove is 0.05mm to 0.2 mm.

6. The seal structure of an inner rotor motor shaft of claim 1, wherein the second groove is provided in a side wall of the mounting hole.

7. The seal structure of an inner rotor motor shaft of claim 1, wherein the seal ring is an O-ring, and the second groove is adapted to the O-ring.

8. The seal structure of an inner rotor motor shaft according to claim 1, wherein the bearing is a waterproof bearing.

9. The sealing structure of an inner rotor motor shaft according to claim 1, wherein two mounting holes are formed in the housing, and the bearing is disposed between each mounting hole and the rotating shaft.

10. An electric motor comprising a stator assembly, a rotor core and a sealing structure of an inner rotor motor shaft according to any one of claims 1 to 9, wherein the stator assembly is installed in the housing, the rotor core is installed on the rotating shaft, and the rotor core and the stator assembly are positioned correspondingly.