Shafting structure and motor

Abstract

The utility model discloses a shafting structure and a motor, and relates to the technical field of motors, the shafting structure comprises a rotating shaft, an end cover and a bearing arranged between the rotating shaft and the end cover; the end cover is provided with a mounting hole; the outer ring of the bearing is in interference fit with the mounting hole; a plurality of annular grooves are formed in the inner side wall of the mounting hole, and all the annular grooves are linearly distributed in the axial direction of the end cover; each annular groove is internally provided with an anti-skid ring, and the anti-skid rings are elastically extruded between the annular grooves and the outer ring, so that the anti-skid rings are subjected to two-way extrusion of the annular grooves and the outer ring to generate continuous elastic deformation, the friction resistance between the end cover and the outer ring is effectively increased, and it is guaranteed that the anti-skid rings are tightly attached to the outer ring; and the outer ring is prevented from relatively sliding in the mounting hole of the end cover, so that the risk that the bearing runs out of the outer ring is fundamentally reduced, the mounting precision of the bearing is improved, vibration noise caused by micro motion of the outer ring is eliminated, the working clearance of the bearing is stabilized, the motor can keep stable operation under the working conditions of starting, stopping and speed changing, and the operation stability of the motor is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a shaft system structure and a motor. Background Technology

[0002] In the shaft system structure of an electric motor, the bearing is the core component that ensures the stable operation of the rotor. The outer ring of the bearing and the end cover are generally fitted with an interference fit, that is, the outer ring of the bearing and the end cover fit tightly to form a direct metal-metal contact, which provides stable support and precise positioning for the motor under normal operating conditions.

[0003] However, the actual operating conditions of motors are complex and varied. When encountering strong vibrations, sudden impacts, or significant temperature rises due to prolonged operation, the outer ring of the bearing may slip relative to the inner hole of the end cover, a phenomenon commonly known as "outer ring slippage." Once outer ring slippage occurs, continuous friction will occur between the outer ring of the bearing and the inner surface of the end cover. This friction disrupts the original precise installation position of the bearing, leading to a decrease in bearing accuracy, which in turn causes abnormal vibrations and harsh noises during motor operation, severely affecting the stability of motor operation. Utility Model Content

[0004] The purpose of this utility model is to provide a shaft system structure and a motor. Several annular grooves are added in the mounting hole of the end cover, and anti-slip rings are installed in the annular grooves. The anti-slip rings are elastically deformed by the bidirectional compression of the annular grooves and the outer ring, which increases the frictional resistance between the end cover and the outer ring of the bearing, thus solving the technical problem of poor operating stability of existing motors.

[0005] To achieve the above objectives, this utility model provides a shaft system structure, including a rotating shaft, an end cover, and a bearing disposed between the rotating shaft and the end cover; the end cover is provided with a mounting hole, and the outer ring of the bearing is interference-fitted with the mounting hole;

[0006] The inner wall of the mounting hole is provided with several annular grooves, all of which are linearly distributed along the axial direction of the end cap; each annular groove is equipped with an anti-slip ring, which is elastically pressed between the annular groove and the outer ring.

[0007] In some embodiments, the bearing further includes a water-slinging ring sleeved on the rotating shaft, the rotating shaft having a limiting shoulder, and the two ends of the inner ring of the bearing abutting against the water-slinging ring and the limiting shoulder, respectively.

[0008] In some embodiments, the rotating shaft is fixed with a shaft end retaining ring, which abuts against the end of the water-slinging ring away from the inner ring.

[0009] In some embodiments, the water-slinging ring has a through hole, and a circumferential groove is formed on the inner sidewall of the through hole; the inner diameter of the circumferential groove is larger than the inner diameter of the through hole.

[0010] In some embodiments, an outer cover is also included on the outer periphery of the water-spinning ring, and a labyrinth seal structure is formed between the water-spinning ring and the outer cover.

[0011] In some embodiments, the labyrinth sealing structure includes interlocking teeth and interlocking grooves that interlock between the contact surfaces of the water-spraying ring and the outer cover.

[0012] In some embodiments, the outer cover has an L-shaped oil hole, and the end cover has an axial oil hole, with the L-shaped oil hole communicating with the axial oil hole.

[0013] In some embodiments, the bottom of the annular groove has two parallel bottom edges, and the opening of the annular groove has two parallel opening edges, both of which are rounded edges.

[0014] In some embodiments, the radius of the bottom edge of the groove ranges from 0.4 mm to 0.8 mm; the radius of the opening edge ranges from 0.1 m to 0.3 m.

[0015] This utility model also provides an electric motor, including the above-described shaft system structure.

[0016] Compared to the prior art, this utility model adds several annular grooves in the mounting hole of the end cover, and anti-slip rings are installed in the annular grooves. The anti-slip rings are subjected to bidirectional compression by the annular grooves and the outer ring, resulting in continuous elastic deformation. This effectively increases the frictional resistance between the end cover and the outer ring, ensuring that the anti-slip ring and the outer ring fit tightly together. It prevents the outer ring from sliding relative to the outer ring in the mounting hole of the end cover, fundamentally reducing the risk of the bearing running out of the outer ring, improving the installation accuracy of the bearing, eliminating vibration noise caused by the slight movement of the outer ring, stabilizing the bearing working clearance, and enabling the motor to maintain smooth operation under start-stop and speed change conditions, effectively improving the operating stability of the motor. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a front view of the shaft system structure provided in an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 Sectional view along axis AA;

[0020] Figure 3 for Figure 2 A magnified view of part B in the image;

[0021] Figure 4 for Figure 1 Axonometric view of the middle end cap;

[0022] Figure 5 for Figure 4 The main view;

[0023] Figure 6 for Figure 5 CC-direction sectional view;

[0024] Figure 7 for Figure 6 A magnified view of part D;

[0025] Figure 8 for Figure 1 Axonometric view of the water-throwing ring in the middle;

[0026] Figure 9 for Figure 8 The main view;

[0027] Figure 10 for Figure 9 A sectional view;

[0028] Figure 11 for Figure 1 Axonometric drawing of the outer and middle covers;

[0029] Figure 12 for Figure 11 Front view;

[0030] Figure 13 for Figure 12 EE-directed sectional view;

[0031] Figure 14 for Figure 11 Rear view.

[0032] The attached figures are labeled as follows:

[0033] 1. Shaft; 2. End cover; 3. Bearing; 4. Anti-slip ring; 5. Water-slinging ring; 6. Shaft end retaining ring; 7. Outer cover; and 8. Labyrinth seal structure.

[0034] Limit shoulder 11;

[0035] Mounting hole 21, annular groove 22 and axial oil hole 23;

[0036] The bottom edge 221 and the opening edge 222;

[0037] Outer ring 31 and inner ring 32;

[0038] Through hole 51 and circumferential groove 52;

[0039] L-shaped oil hole 71;

[0040] Occlusal teeth 81 and occlusal grooves 82. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] This utility model discloses a shaft system structure, as shown in the attached figure. Figure 1 and 2 As shown, the assembly includes a rotating shaft 1, an end cover 2, and a bearing 3. The bearing 3 is disposed between the rotating shaft 1 and the end cover 2, allowing the rotating shaft 1 to rotate relative to the end cover 2. The bearing 3 is preferably a deep groove ball bearing 3, but is not limited thereto.

[0044] Shaft 1 is a stepped shaft, as shown in the attached diagram. Figure 2 As shown in the attached document. Figure 4 and 5 As shown, the end cover 2 has several heat dissipation fins formed on its end face, which increases the contact area between the end cover 2 and the outside world and improves the heat dissipation efficiency of the motor. The end cover 2 is preferably a cast iron end cover, and its material can be HT250.

[0045] As attached Figure 2 and 6 As shown, the end cap 2 has a mounting hole 21, and the outer ring 31 of the bearing 3 is interference-fitted with the mounting hole 21, so that the outer ring 31 of the bearing 3 remains stationary with the end cap 2. (See attached diagram) Figure 2 , 6 As shown in Figure 7, the inner wall of the mounting hole 21 is provided with several annular grooves 22, and all the annular grooves 22 are linearly distributed along the axial direction of the end cover 2.

[0046] The key point is, as attached Figure 2 and 3As shown, each annular groove 22 is equipped with an anti-slip ring 4. The anti-slip ring 4 is made of flexible material, which allows the anti-slip ring 4 to be elastically squeezed between the annular groove 22 and the outer ring 31. The anti-slip ring 4 is subjected to bidirectional compression from the annular groove 22 and the outer ring 31, resulting in continuous elastic deformation. The cross section of the anti-slip ring 4 will be subjected to 5%-15% compression deformation, which effectively increases the frictional resistance between the end cover 2 and the outer ring 31, ensuring that the anti-slip ring 4 and the outer ring 31 fit tightly. This prevents the outer ring 31 from sliding relative to the end cover 2 in the mounting hole 21, fundamentally reducing the risk of the bearing 3 running out of the outer ring 31, improving the installation accuracy of the bearing 3, eliminating vibration noise caused by the slight movement of the outer ring 31, stabilizing the working clearance of the bearing 3, and enabling the motor to maintain smooth operation under start-stop and speed change conditions, effectively improving the operating stability of the motor.

[0047] The anti-slip ring 4 is a one-piece molded O-ring structure, preferably made of nitrile rubber, but not limited to this. The annular groove 22 is filled with grease, such as butter, to ensure a good fit between the anti-slip ring 4 and the end cap 2. The depth and width of the annular groove 22 can be adaptively adjusted according to the specifications of the anti-slip ring 4 to ensure that the anti-slip ring 4 has sufficient room for expansion after deformation.

[0048] The shaft system structure also includes a water-slinging ring 5 fitted onto the rotating shaft 1. The structure of the water-slinging ring 5 is optimized, replacing the oil-slinging ring and V-type shaft seal ring in the traditional shaft system structure. This increases the oil storage space of the shaft system structure by about 20%, allowing the bearing 3 to receive more effective lubrication and reducing the frequency of oil injection to some extent. The rotating shaft 1 is provided with a limiting shoulder 11. The two ends of the inner ring 32 of the bearing 3 abut against the water-slinging ring 5 and the limiting shoulder 11, respectively, thereby axially limiting the inner ring 32 of the bearing 3 and improving the positioning accuracy of the bearing 3.

[0049] Furthermore, as shown in the appendix Figure 2 As shown, the rotating shaft 1 is fixed with a shaft end retaining ring 6, which abuts against the end of the water-throwing ring 5 away from the inner ring 32, thereby axially limiting the water-throwing ring 5 and further improving the positioning accuracy of the bearing 3.

[0050] As a preferred embodiment, as shown in the appendix Figure 6 , 8 As shown in Figure 10, the water-slinging ring 5 has a through hole 51, and a circumferential groove 52 is formed on the inner wall of the through hole 51. The inner diameter of the circumferential groove 52 is larger than the inner diameter of the through hole 51. By reducing the contact area between the water-slinging ring 5 and the rotating shaft 1, the mating surfaces of the water-slinging ring 5 and the rotating shaft 1 are designed to be in partial contact rather than a tight fit along the entire circumference. The contact area is concentrated at both ends of the water-slinging ring 5, avoiding interference caused by machining errors and avoiding jamming caused by slight ellipticity when in full-circumference contact. Moreover, the contact at both ends forms a floating support, allowing for slight eccentricity or thermal expansion of the rotating shaft 1, which is more conducive to a good fit between the water-slinging ring 5 and the rotating shaft 1. Specifically, as shown in the attached figure... Figures 8 to 10As shown, the water-slinging ring 5 is provided with a limiting flange, which mates with the limiting groove of the outer cover 7 along the axial direction to axially limit the water-slinging ring 5. Engaging teeth 81 and engagement grooves 82 are formed between the limiting flange and the limiting groove.

[0051] As attached Figures 11 to 14 As shown, the shaft system structure also includes an outer cover 7 sleeved around the outer periphery of the water-slinging ring 5. A labyrinth seal structure 8 is formed between the water-slinging ring 5 and the outer cover 7, which replaces the traditional V-shaped shaft seal ring, resulting in better sealing performance and effectively reducing the later maintenance cost of the shaft system structure.

[0052] In a preferred embodiment, the labyrinth sealing structure 8 includes interlocking teeth 81 and interlocking grooves 82, which are formed between the contact surfaces of the water-slinging ring 5 and the outer cover 7, as shown in the attached figure. Figure 2 As shown, but not limited to.

[0053] As attached Figure 2 As shown, the outer cover 7 has an L-shaped oil hole 71, and the end cover 2 has an axial oil hole 23. The L-shaped oil hole 71 and the axial oil hole 23 are connected to form a grease injection channel, so that the grease can enter the bearing 3 through the grease injection channel, fully lubricate the bearing 3, and help extend the service life of the bearing 3.

[0054] As attached Figure 6 and 7 As shown, the bottom of the annular groove 22 has two parallel groove bottom edges 221, and the opening of the annular groove 22 has two parallel opening edges 222. Both the groove bottom edges 221 and the opening edges 222 are rounded edges, which are formed by rounding corners. This not only enhances the structural strength of the end cap 2 and effectively disperses stress, but also contributes to the safety of the anti-slip ring 4 and makes assembly more convenient. The radius of the groove bottom edges 221 ranges from 0.4mm to 0.8mm; the radius of the opening edges 222 ranges from 0.1m to 0.3m.

[0055] This utility model also provides an electric motor, which includes the above-mentioned shaft system structure and has the same beneficial effects.

[0056] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0057] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A shaft system structure, characterized in that, It includes a rotating shaft (1), an end cover (2), and a bearing (3) disposed between the rotating shaft (1) and the end cover (2); the end cover (2) is provided with a mounting hole (21), and the outer ring (31) of the bearing (3) is interference-fitted with the mounting hole (21); The inner wall of the mounting hole (21) is provided with a number of annular grooves (22), and all the annular grooves (22) are linearly distributed along the axial direction of the end cap (2); each annular groove (22) is equipped with an anti-slip ring (4), and the anti-slip ring (4) is elastically pressed between the annular groove (22) and the outer ring (31).

2. The shaft system structure according to claim 1, characterized in that, It also includes a water-slinging ring (5) sleeved on the rotating shaft (1), the rotating shaft (1) is provided with a limiting shoulder (11), and the two ends of the inner ring (32) of the bearing (3) abut against the water-slinging ring (5) and the limiting shoulder (11) respectively.

3. The shaft system structure according to claim 2, characterized in that, The rotating shaft (1) is fixed with a shaft end retaining ring (6), which abuts against the end of the water-slinging ring (5) away from the inner ring (32).

4. The shaft system structure according to claim 2, characterized in that, The water-throwing ring (5) is provided with a through hole (51), and a circumferential groove (52) is formed on the inner sidewall of the through hole (51); the inner diameter of the circumferential groove (52) is larger than the inner diameter of the through hole (51).

5. The shaft system structure according to claim 2, characterized in that, It also includes an outer cover (7) fitted around the outer periphery of the water-spraying ring (5), and a labyrinth sealing structure (8) is formed between the water-spraying ring (5) and the outer cover (7).

6. The shaft system structure according to claim 5, characterized in that, The labyrinth sealing structure (8) includes interlocking teeth (81) and interlocking grooves (82) formed between the contact surfaces of the water-spraying ring (5) and the outer cover (7).

7. The shaft system structure according to claim 5, characterized in that, The outer cover (7) has an L-shaped oil hole (71), and the end cover (2) has an axial oil hole (23). The L-shaped oil hole (71) and the axial oil hole (23) are connected.

8. The shaft system structure according to any one of claims 1 to 7, characterized in that, The bottom of the annular groove (22) has two parallel bottom edges (221), and the opening of the annular groove (22) has two parallel opening edges (222). Both the bottom edges (221) and the opening edges (222) are rounded edges.

9. The shaft system structure according to claim 8, characterized in that, The radius of the bottom edge (221) of the groove is 0.4mm to 0.8mm; the radius of the opening edge (222) of the groove is 0.1m to 0.3m.

10. An electric motor, characterized in that, Includes the shaft system structure as described in any one of claims 1 to 9.

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