A ball bearing fixing device, a ball bearing and a motor

Abstract

The utility model relates to motor bearing fixing technical field especially relates to a ball bearing fixing device, ball bearing and motor, including fender ring no.

Description

Technical Field

[0001] This utility model relates to the field of motor bearing fixing technology, and in particular to a ball bearing fixing device, a ball bearing, and a motor. Background Technology

[0002] Heavy-duty scraper conveyors in coal mines are characterized by high power, large conveying capacity, and high strength. They are equipped with high-power explosion-proof three-phase asynchronous motors. Existing high-power explosion-proof three-phase asynchronous motors include a motor housing and a rotating shaft rotatably located in the middle of the motor housing. The motor housing has a front cover and a rear cover at both ends, and bearings are installed inside both the front and rear covers. These bearings are susceptible to impact loads and bear large radial loads. The bearing structure adopts a three-bearing structure: cylindrical roller bearings and ball bearings are used at the shaft extension end, while cylindrical roller bearings are used at the non-shaft extension end. Cylindrical roller bearings have a high radial load capacity and can withstand heavy and impact loads; ball bearings can withstand moderate radial and axial loads.

[0003] The existing ball bearing body includes an inner ring and an outer ring, with a number of steel balls movably disposed between the inner and outer rings, and a retainer for limiting the position of the steel balls is provided on the steel balls.

[0004] However, the existing technology still has some shortcomings in its use: In the existing structure, the front end uses cylindrical roller bearings and ball bearings. The inner ring of the ball bearing is axially positioned only by a retaining ring, which cannot prevent radial movement of the ball bearing and axial displacement of the outer ring. During the use of the motor, the outer ring of the ball bearing has axial and radial displacement, which can easily damage the bearing, causing the rotor to rotate out of alignment and the stator and rotor to rub against each other, thus damaging the motor. Therefore, the existing technology needs to be further improved. Utility Model Content

[0005] The purpose of this invention is to provide a ball bearing fixing device, a ball bearing, and a motor to solve the problems mentioned in the background art.

[0006] The present invention adopts the following technical solution: a ball bearing fixing device, including a first retaining ring, a second retaining ring, and a bearing inner cover. The bearing inner cover is connected to the inner side of the front end cover. The first retaining ring is disposed between the outer ring of the ball bearing and the bearing inner cover. The first retaining ring and the bearing inner cover cooperate to stabilize the outer ring of the ball bearing. The second retaining ring is disposed on the outer side of the inner ring of the ball bearing and sleeved on the rotating shaft. The second retaining ring and the shoulder of the rotating shaft cooperate to stabilize the inner ring of the ball bearing.

[0007] Optionally, retaining ring two is interference-fitted with the rotating shaft, while retaining ring one is clearance-fitted with the inner cover of the bearing.

[0008] Optionally, a cylindrical pin is axially provided between the retaining ring and the bearing inner cover.

[0009] Optionally, an oil hole is provided radially on the upper side of the retaining ring.

[0010] Optionally, the inner cover of the bearing may be provided with several oil grooves evenly distributed inside.

[0011] This utility model also provides a ball bearing, including a ball bearing body and a ball bearing fixing device as described above.

[0012] This utility model also provides an electric motor, including an electric motor housing and a rotating shaft rotatably disposed in the middle of the electric motor housing, wherein the shaft extension end of the rotating shaft is rotatably connected to the electric motor housing through a ball bearing as described above.

[0013] Optionally, a front cover and a rear cover are respectively provided at the front and rear ends of the motor housing. A ball bearing is provided inside the front cover. A cylindrical roller bearing is provided in the middle of both the front and rear covers. A front bearing outer cover is provided on the front side of the front cover, and the front bearing outer cover abuts against the outer ring of the cylindrical roller bearing. A rear bearing inner cover and a rear bearing outer cover are respectively provided on the inner and outer sides of the rear cover. The rear bearing inner cover rotates with the shaft, and the rear bearing inner cover and the rear bearing outer cover abut against the outer ring of the cylindrical roller bearing.

[0014] Optionally, a cylindrical pin 2 is axially provided between the front bearing outer cover, the front end cover and the ball bearing, and a cylindrical pin 3 is axially provided between the rear bearing outer cover, the rear end cover and the rear bearing inner cover.

[0015] Optionally, retaining ring one and retaining ring two are respectively provided at the front and rear ends of the rotating shaft. Both retaining ring one and retaining ring two are interference fit with the rotating shaft and abut against the outer side of the inner ring of the cylindrical roller bearing on the corresponding side.

[0016] Compared with the prior art, this utility model has the following beneficial effects: by cooperating with retaining ring one, retaining ring two, the inner cover of the front bearing, and the shoulder of the rotating shaft, the inner and outer rings of the ball bearing are positioned in multiple ways. Retaining ring one is stabilized with the inner cover of the bearing by cylindrical pin one. Cylindrical pin two is axially arranged between the outer cover of the front bearing, the front end cover, and the ball bearing, which effectively prevents radial displacement of the ball bearing and axial displacement of the outer ring during the rotation of the rotating shaft. This makes the bearing rotation more stable during the use of the motor, ensures the concentric rotation of the three bearings, enhances the reliability of bearing operation, improves the bearing life, and thus improves the reliability of motor operation, making it more practical. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the installation structure of the ball bearing of this utility model; Figure 3 This utility model Figure 1 Enlarged structural diagram at point A; Figure 4This is a schematic diagram of the structure of the second retaining ring of this utility model; Figure 5 This is a schematic diagram of the structure of the retaining ring of this utility model; Figure 6 This is a schematic diagram of the bearing inner cover of this utility model.

[0018] In the diagram: 1. Motor housing; 2. Shaft; 3. Front end cover; 4. Rear end cover; 5. Cylindrical roller bearing; 6. Inner bearing cover; 7. Outer front bearing cover; 8. Ball bearing body; 9. Retaining ring 1; 10. Retaining ring 2; 11. Cylindrical pin 1; 12. Inner rear bearing cover; 13. Outer rear bearing cover; 14. Cylindrical pin 2; 15. Cylindrical pin 3; 16. Retaining ring 1; 17. Retaining ring 2; 18. Bearing isolator; 19. Oil hole; 20. Oil groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only a part of the embodiments disclosed in this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] Various non-limiting embodiments of this utility model are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0021] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0022] Please see Figure 1-6 The present invention will now be described in detail with reference to the accompanying drawings and embodiments: A ball bearing fixing device includes a first retaining ring 9, a second retaining ring 10, and a bearing inner cover 6. The first retaining ring 9 is disposed between the outer ring of the ball bearing and the bearing inner cover 6. The bearing inner cover 6 is connected to the inner side of the front end cover 3. The first retaining ring 9 and the bearing inner cover 6 cooperate to stabilize the outer ring of the ball bearing, reducing the radial and axial forces on the outer ring of the ball bearing. The second retaining ring 10 is disposed on the outer side of the inner ring of the ball bearing and sleeved on the rotating shaft 2. The second retaining ring 10 and the shoulder of the rotating shaft 2 cooperate to stabilize the inner ring of the ball bearing, reducing the axial force on the inner ring of the ball bearing when it rotates with the rotating shaft.

[0023] The retaining ring 210 is interference-fitted with the rotating shaft 2. The cross-section of the retaining ring 19 is L-shaped. The horizontal section of the retaining ring 19 is in small clearance fit with the inner cover 6 of the bearing, and the vertical section of the retaining ring 19 abuts against the outer side of the outer ring of the ball bearing.

[0024] Please see Figure 2A cylindrical pin 11 is axially provided between the retaining ring 9 and the inner cover 6 of the bearing to prevent the retaining ring 9 from rotating radially and causing the ball bearing 8 to rotate radially.

[0025] Please see Figure 5 The upper side of the retaining ring 9 has an oil hole 19 radially provided to facilitate the lubrication of the ball bearing.

[0026] Please see Figure 6 The bearing inner cover 6 has several oil grooves 20 evenly distributed inside. Grease is injected through oil pipes and into the oil grooves 20 of the bearing inner cover 6 via the oil injection channel of the front cover 3. Regular oil injection ensures effective lubrication of the bearing. The oil pipes and oil injection channels mentioned above are existing technologies and will not be described in detail here.

[0027] This utility model also provides a ball bearing, including a ball bearing body 8 and a ball bearing fixing device as described above.

[0028] This utility model also provides a motor; please refer to [link / reference]. Figure 1-6 It includes a motor housing 1, a rotating shaft 2 rotatably disposed in the middle of the motor housing 1, and a ball bearing as described above. The front end cover 3 and the rear end cover 4 are respectively provided at the front and rear ends of the motor housing 1. The ball bearing is disposed inside the front end cover 3. The cylindrical roller bearing 5 is provided in the middle of both the front end cover 3 and the rear end cover 4.

[0029] Please see Figure 3 The front cover 3 has a front bearing outer cover 7 on its front side, which abuts against the outer ring of the cylindrical roller bearing 5. The rear cover 4 has a rear bearing inner cover 12 and a rear bearing outer cover 13 on its inner and outer sides, respectively. The rear bearing inner cover 12 rotates with the rotating shaft 2, and the rear bearing inner cover 12 and the rear bearing outer cover 13 abut against the outer ring of the cylindrical roller bearing 5.

[0030] Please see Figure 2-3 A cylindrical pin 2 14 is axially arranged between the front bearing outer cover 7, the front end cover 3 and the ball bearing, and a cylindrical pin 3 15 is axially arranged between the rear bearing outer cover 13, the rear end cover 4 and the rear bearing inner cover 12. The arrangement of cylindrical pins 2 14 and 3 15 can further enhance the stability of the cylindrical roller bearing 5 and the ball bearing, and further reduce the axial and radial forces experienced by the cylindrical roller bearing 5 and the ball bearing when rotating. It also ensures that the cylindrical roller bearing 5 and the ball bearing always rotate concentrically, which enhances the reliability of bearing operation, increases the service life of bearing, and thus improves the reliability of motor operation.

[0031] Please see Figure 2-3The rotating shaft 2 is provided with retaining ring 16 and retaining ring 27 at its front and rear ends, respectively. Both retaining ring 16 and retaining ring 217 are interference fit with the rotating shaft 2 and abut against the outer side of the inner ring of the cylindrical roller bearing 5 on the corresponding side. The inner ring of the cylindrical roller bearing 5 is stabilized by the cooperation of retaining ring 16 and retaining ring 217 and the shoulder of the rotating shaft 2, and the axial force on the cylindrical roller bearing 5 when it rotates is reduced.

[0032] Please see Figure 1-2 A bearing isolator 18 is installed inside the front bearing outer cover 7 to improve sealing performance.

[0033] Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as a limitation on the present invention.

[0034] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A ball bearing fixing device, characterized in that: It includes retaining ring one, retaining ring two, and bearing inner cover. The bearing inner cover is connected to the inner side of the front cover. Retaining ring one is set between the outer ring of the ball bearing and the bearing inner cover. Retaining ring one and bearing inner cover cooperate to stabilize the outer ring of the ball bearing. Retaining ring two is set on the outer side of the inner ring of the ball bearing and is sleeved on the rotating shaft. Retaining ring two and the shaft shoulder cooperate to stabilize the inner ring of the ball bearing.

2. The ball bearing fixing device according to claim 1, characterized in that: The second retaining ring is interference-fitted with the rotating shaft, while the first retaining ring is clearance-fitted with the inner cover of the bearing.

3. The ball bearing fixing device according to claim 2, characterized in that: A cylindrical pin is axially positioned between the retaining ring and the inner cover of the bearing.

4. The ball bearing fixing device according to claim 1, characterized in that: An oil hole is radially provided on the upper side of the retaining ring.

5. The ball bearing fixing device according to claim 1, characterized in that: Several oil grooves are evenly distributed inside the bearing inner cover.

6. A ball bearing, characterized in that: It includes the ball bearing body and the ball bearing fixing device as described in any one of claims 1 to 5.

7. An electric motor, comprising a motor housing and a rotating shaft rotatably disposed in the middle of the motor housing, characterized in that: The shaft extension end is rotatably connected to the motor housing via the ball bearing as described in claim 6.

8. The motor according to claim 7, characterized in that: The motor housing has a front cover and a rear cover at its front and rear ends, respectively. A ball bearing is located inside the front cover. A cylindrical roller bearing is located in the middle of both the front and rear covers. A front bearing outer cover is located on the front side of the front cover, and the front bearing outer cover abuts against the outer ring of the cylindrical roller bearing. A rear bearing inner cover and a rear bearing outer cover are located on the inner and outer sides of the rear cover, respectively. The rear bearing inner cover rotates with the shaft, and the rear bearing inner cover and the rear bearing outer cover abut against the outer ring of the cylindrical roller bearing.

9. The motor according to claim 8, characterized in that: A cylindrical pin is axially arranged between the outer cover of the front bearing, the front end cover, and the ball bearing. A cylindrical pin is axially arranged between the outer cover of the rear bearing, the rear end cover, and the inner cover of the rear bearing.

10. The motor according to claim 9, characterized in that: Retaining ring 1 and retaining ring 2 are respectively provided at the front and rear ends of the rotating shaft. Both retaining ring 1 and retaining ring 2 are interference fit with the rotating shaft and abut against the outer side of the inner ring of the cylindrical roller bearing on the corresponding side.

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