Ball bearing for motor with low-friction sealing assembly
By combining the design of a maze-type sealing structure and a contact sealing structure in ball bearings, the problem of increasing friction torque in the existing contact sealing structure is solved, and the effect of low friction torque and high-efficiency sealing is achieved, which is suitable for high-speed motors.
Patent Information
- Application Number
- CN202421858409.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The existing contact seal structure adds friction torque to the ball bearings, which cannot meet the energy efficiency requirements of high-speed motors.
A ball bearing for motors with low friction sealing components is designed, and a combination of a maze-type sealing structure and a contact sealing structure is used to form appropriate gaps and contact points through the special design of the skeleton part and the colloid part of the sealing component to reduce friction.
It achieves a sealing effect with low friction torque while maintaining efficient sealing performance. It is suitable for high-speed motors and avoids interference between sealing components and retainers.
Smart Images
Figure CN222977236U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of motor bearings, and particularly relates to a ball bearing for motors with a low-friction seal assembly. Background Art
[0002] Ball bearings are widely used in various fields of daily life and industry with light loads. They are the most widely used type of bearings. When ball bearings operate in a polluted environment, the bearings need to be sealed, and the solution of self-contained seal assemblies and grease filling is widely used. Currently, there are various structures for seal assemblies, among which contact seals are the most common seal structures. However, contact seals will increase the frictional torque of the bearings. Under the current premise of advocating energy efficiency improvement and energy loss reduction, the existing contact seal structures do not meet the standards. Therefore, it is necessary to improve the current seal structure so that it can meet the usage standards and be applied to high-speed motors. Summary of the Utility Model
[0003] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to design a ball bearing for motors with a low-friction seal assembly to solve the situation that the ordinary contact seal structure mentioned in the background art increases the frictional torque of the bearings and cannot meet the standards.
[0004] To achieve the above purpose, the utility model adopts the following technical solutions: A ball bearing for motors with a low-friction seal assembly includes an inner bearing ring, a seal assembly, a cage, steel balls, and an outer bearing ring. Steel balls and a cage cooperating with them are arranged between the outer bearing ring and the inner bearing ring. The seal assemblies are symmetrically installed on both sides of the bearing to seal between the outer bearing ring and the inner bearing ring. The outer side of the seal assembly is press-fitted on the inner wall edge of the outer bearing ring, and the inner side of the seal assembly forms a labyrinth seal structure and a contact seal structure with the outer wall edge of the inner bearing ring.
[0005] The seal assembly includes a skeleton part and a rubber part. The rubber part wraps around the outside of the contact part between the skeleton part and the outer bearing ring and the inner bearing ring. A seal lip D is provided at the contact part between the rubber part and the outer bearing ring. A three-lip structure is provided at the contact part between the rubber part and the inner bearing ring. The three-lip structure includes a seal lip A, a seal lip B, and a seal lip C from outside to inside. A three-step type tooth is provided at the outer wall edge of the inner bearing ring. The three-step type tooth includes a step A, a step B, and a step C from outside to inside. The three-lip structure corresponds to the three-step type tooth to form a labyrinth seal structure and a contact seal structure.
[0006] An inclined surface is provided between the step A and the step B, and the sealing lip A is in axial contact with the inclined surface to form a contact sealing structure; a gap is provided between the sealing lip B and the step B, and a gap is provided between the sealing lip C and the step C to form a labyrinth sealing structure.
[0007] The horizontal height of the sealing lip C is lower than the horizontal height of the ball shoulder of the steel ball, forming a safety space between the outer ring and the inner ring of the bearing, so that the rubber part does not interfere with the cage.
[0008] The gap of the labyrinth sealing structure is between greater than or equal to 0.1 mm and less than or equal to 0.3 mm.
[0009] The beneficial effects of the present utility model are as follows: The overall friction of the improved sealing component is lower than that of the prior art, and the sealing effect is not lower than that of the prior art. The sufficient internal space enables the sealing component and the cage to have no interference problem, and it is applicable to high-speed motors. Description of the Drawings
[0010] Figure 1 It is a schematic structural diagram of the present utility model.
[0011] Figure 2 It is Figure 1 a partial enlarged schematic diagram of the three-lip structure at X in
[0012] Figure 3 It is Figure 1 a partial enlarged schematic diagram of the safety space at Y in
[0013] In the figure: 1, inner ring of the bearing; 2, sealing component; 201, skeleton part; 202, rubber part; 3, cage; 4, steel ball; 401, ball shoulder; 5, outer ring of the bearing; 6, sealing lip A; 7, sealing lip B; 8, sealing lip C; 9, sealing lip D; 10, step A; 11, step B; 12, step C; 13, safety space. Detailed Embodiment
[0014] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the drawings of this specification. It should be noted that the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.
[0015] Please refer to Figures 1 - 3, a ball bearing for an electric motor with a low-friction seal assembly, comprising an inner bearing ring 1, a seal assembly 2, a cage 3, steel balls 4 and an outer bearing ring 5. Steel balls 4 and a cooperating cage 3 are provided between the outer bearing ring 5 and the inner bearing ring 1. The seal assemblies 2 are symmetrically installed on both sides of the bearing to seal between the outer bearing ring 5 and the inner bearing ring 1. The outer side of the seal assembly 2 is press-fitted on the inner wall edge of the outer bearing ring 5, and the inner side of the seal assembly 2 forms a labyrinth seal structure and a contact seal structure with the outer wall edge of the inner bearing ring 1. The seal assembly 2 includes a skeleton part 201 and a rubber part 202. The rubber part 202 wraps around the outside of the contact area between the skeleton part 201 and the outer bearing ring 5 and the inner bearing ring 1. A seal lip D9 is provided at the contact area between the rubber part 202 and the outer bearing ring 5. A three-lip structure is provided at the contact area between the rubber part 202 and the inner bearing ring 1. The three-lip structure includes a seal lip A6, a seal lip B7 and a seal lip C8 in sequence from outside to inside. A three-step type tooth profile is provided at the outer wall edge of the inner bearing ring 1. The three-step type tooth profile includes a step A10, a step B11 and a step C12 in sequence from outside to inside. The three-lip structure corresponds to the three-step type tooth profile to form a labyrinth seal structure and a contact seal structure. An inclined surface is provided between the step A10 and the step B11. The seal lip A6 is axially in contact with the inclined surface to form a contact seal structure. A gap is provided between the seal lip B7 and the step B11, and a gap is provided between the seal lip C8 and the step C12 to form a labyrinth seal structure. The horizontal height of the seal lip C8 is lower than the horizontal height of the ball shoulder 401 of the steel ball 4, forming a safety space 13 between the outer bearing ring 5 and the inner bearing ring 1, so that the rubber part 202 does not interfere with the cage 3. The gap of the labyrinth seal structure is between greater than or equal to 0.1 mm and less than or equal to 0.3 mm.
[0016] When the utility model is in use:
[0017] The gaps between the seal lip B7, the seal lip C8 and the step B11, the step C12 are between 0.1 mm and 0.3 mm. The formed labyrinth seal structure does not generate friction when the bearing is working. The contact seal structure formed by the axial contact of the seal lip A6 and the inclined surface. When the bearing is working, the inner bearing ring 1 rotates, and the axial contact friction force is greatly reduced compared with the radial contact friction force. Therefore, the overall friction force of the seal assembly 2 is lower than the prior art, and at the same time, the sealing effect is not lower than the prior art;
[0018] In the prior art, due to the limited internal space of the bearing, after the sealing component is set, the space for the cage is often insufficient. Due to the existence of various clearances and machining errors, if the distance between the cage and the sealing component is too small, interference between the cage and the sealing component will occur during the operation of the bearing. To solve this problem, the solution proposed by the present utility model is as Figure 3 shown. The step C12 is set to have a sufficient depth so that the height of the sealing lip C8 is much lower than the height of the ball shoulder 401. Thus, the rubber part 202 of the sealing component 2 is far away from the cage 3, maintaining a sufficient safety space 13 and thus avoiding interference.
[0019] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
[0020] The parts not detailed in the present utility model are the prior art.
Claims
1. A ball bearing for a motor with a low-friction seal assembly, comprising a bearing inner ring (1), a seal assembly (2), a retainer (3), a steel ball (4) and a bearing outer ring (5), wherein: A steel ball (4) and a retainer (3) matched therewith are provided between the bearing outer ring (5) and the bearing inner ring (1); the sealing assembly (2) is symmetrically mounted on both sides of the bearing to seal between the bearing outer ring (5) and the bearing inner ring (1); the outer side of the sealing assembly (2) is interference-mounted on the inner wall edge of the bearing outer ring (5); the inner side of the sealing assembly (2) and the outer wall edge of the bearing inner ring (1) form a labyrinth-type sealing structure and a contact sealing structure; The sealing assembly (2) comprises a skeleton part (201) and a gel part (202), wherein the gel part (202) is wrapped around the outside of the skeleton part (201) where it contacts the bearing outer ring (5) and the bearing inner ring (1), wherein a sealing lip D (9) is provided at the contact part of the gel part (202) with the bearing outer ring (5), wherein a three-lip structure is provided at the contact part of the gel part (202) with the bearing inner ring (1), wherein the three-lip structure is composed of a sealing lip A (6), a sealing lip B (7) and a sealing lip C (8) from the outside to the inside, and wherein a three-step-type tooth opening is provided on the outer wall edge of the bearing inner ring (1), wherein the three-step-type tooth opening is composed of a step A (10), a step B (11) and a step C (12) from the outside to the inside, and wherein the three-lip structure corresponds to the three-step-type tooth opening to form a labyrinth-type sealing structure and a contact-type sealing structure.
2. A ball bearing for a motor with a low friction seal assembly according to claim 1, characterized in that: A transition slope is provided between the step A (10) and the step B (11), and the sealing lip A (6) is in axial contact with the transition slope, thereby forming a contact sealing structure; a gap is provided between the sealing lip B (7) and the step B (11), and a gap is provided between the sealing lip C (8) and the step C (12), thereby forming a labyrinth sealing structure.
3. A ball bearing for a motor with a low friction seal assembly according to claim 1, characterized in that: The level of the sealing lip C (8) is lower than the level of the ball shoulder of the steel ball (4), forming a safety space (13) between the bearing outer ring (5) and the bearing inner ring (1), so that the rubber part (202) and the retainer (3) do not interfere with each other.
4. A ball bearing for a motor with a low friction seal assembly according to claim 2, characterized in that: The gap of the labyrinth sealing structure is between greater than or equal to 0.1 mm and less than or equal to 0.3 mm.