A low-torque labyrinth seal assembly

Abstract

The present invention discloses a low-torque labyrinth seal assembly, mainly including a skeleton A, etc. The outer ring is assembled with the inner ring through steel balls held by a cage, and a raceway is formed between the outer ring and the inner ring. The inner side of the mouth of the outer ring is connected to the skeleton A, the outer side of the inner ring is connected to the skeleton B, and the outer side of the skeleton B is press-fitted with the skeleton C in an interference fit. The skeleton A, the skeleton B, and the skeleton C are nested and matched with each other. The skeleton B is wrapped with magnetic rubber, and the magnetic rubber contacts the inner ring. The outer part of the skeleton A is wrapped with rubber, and the outer rubber is provided with protrusions for press-fitting and interference fit with the outer ring. The outer rubber is provided with a lip A, a lip B, and a lip C. On the premise of ensuring magnetic signal output and sealing performance, the present invention adopts a low-lip design with only 2 contact lips, which can effectively reduce the friction torque; through the design of a new labyrinth structure, a labyrinth effect is generated, thereby increasing the difficulty of mud and water intrusion, reducing the risk of grease pollution and grease overflow caused by mud and water intrusion into the raceway, and improving the sealing performance.

Description

Technical Field

[0001] The invention relates to the field of wheel hub bearings, and in particular to a low-torque labyrinth seal assembly. Background Art

[0002] The wheel hub bearing is an automotive component that bears the weight of the outer ring rotation and provides precise guidance for the rotation of the wheel hub; the magnetic ring is a component that provides an alternating magnetic field to provide a wheel speed signal; the sealing assembly is a part that prevents external mud and water from invading and internal grease from leaking. In the prior art solution, the rubber protrusion and multiple lips are a whole single-piece structure attached to the skeleton. The skeleton is installed on the outer ring of the wheel hub, and the static skeleton is installed on the inner ring. There is a gap between the lips and the stainless steel skeleton in the natural state. In the prior art, more lips are in contact with the rotating skeleton, which is easy to cause a large friction torque. When a large amount of mud and water invade the gap, it directly contacts the lips. The sealing pressure of the lips is large, and mud and water are more likely to invade the raceway and cause pollution; at the same time, there is a possibility that mud and water will penetrate into the raceway through the gap between the rotating skeleton and the static skeleton during rotation, and the risk of mud and water invading causing raceway failure, grease contamination and grease overflow is high. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a low-torque labyrinth seal assembly.

[0004] The objective of the present invention is achieved through the following technical scheme: This low-torque labyrinth seal assembly mainly includes a skeleton A, a skeleton B, a skeleton C, an outer rubber, a magnetic rubber, a lip A, a lip B, a lip C, a cavity A, a cavity B, a cavity C, a cavity D, an outer ring, a steel ball, a retaining frame, an inner ring, a gap A, a gap B, and a gap C. The outer ring is assembled with the inner ring through a steel ball retained by the retaining frame, and a raceway is formed between the outer ring and the inner ring. The inner side of the outer ring mouth is connected to the skeleton A, the outer side of the inner ring is connected to the skeleton B, the outer side of the skeleton B is connected to the skeleton C through interference, and the skeleton A and the skeleton Skeleton B and skeleton C are nested with each other, skeleton B is wrapped with magnetic rubber, and the magnetic rubber is in contact with the inner ring, skeleton A is wrapped with outer rubber, and the outer rubber is provided with protrusions and is press-fitted with the outer ring for interference fit, and the outer rubber is provided with lips A, lips B and lips C, a cavity A is formed above lip A, a cavity B is formed between lips A and lip B, a cavity C is formed between lips B and lip C, a cavity D is formed between skeleton B and skeleton C, a gap A is formed between lip A and the magnetic rubber, a gap B is formed between lip A and skeleton C, and a gap C is formed between the magnetic rubber and the outer rubber.

[0005] The skeleton A adopts a maze design, which creates a maze effect with the skeleton C.

[0006] The frame C adopts a frame folding design to raise the lip position.

[0007] The lip A is not in contact with the skeleton C in its natural state, and there is a small gap B between them.

[0008] The lip B is in interference contact with the skeleton C in its natural state, and the contact angle α between them ranges from 0° to 160°.

[0009] The lip C is in a rigid contact state without interference with the skeleton C in its natural state, and the contact angle β between them ranges from 0° to 160°.

[0010] When the skeleton C is press-fitted with the lip A, they are axially aligned, and the width d of the channel formed by the skeleton C and the skeleton B ranges from 0.1 to 0.7 mm.

[0011] The width dimensions of the gaps A, B, and C all range from 0.1 to 0.7 mm.

[0012] The beneficial effects of the present invention are as follows: On the premise of ensuring magnetic signal output and sealing performance, the present invention adopts a design with fewer lips with only 2 contact lips, which can effectively reduce the frictional torque; through the design of a new labyrinth structure, a labyrinth effect is generated, thereby increasing the difficulty of mud and water intrusion, reducing the risk of grease contamination and grease spillage caused by mud and water invading and seeping into the raceway, and improving the sealing performance; by raising the position of the lip through structural design, as little mud and water as possible have the opportunity to splash into the cavity and contact the contact lip, thereby reducing the possibility of the lip being exposed to mud and water, and thus avoiding mud and water invading the raceway, achieving the purpose of low torque, fewer lips, and high sealing performance. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the prior art.

[0014] Figure 2 It is a schematic structural diagram of the present invention.

[0015] Figure 3 It is a schematic diagram of the gap of the present invention.

[0016] Figure 4 It is a schematic diagram of the angles of the lip B and the lip C of the present invention.

[0017] Description of the reference numerals: Skeleton A1, Skeleton B2, Skeleton C3, Outer rubber 4, Magnetic rubber 5, Lip A6, Lip B7, Lip C8, Protrusion 9, Cavity A10, Cavity B11, Cavity C12, Cavity D13, Outer ring 14, Steel ball 15, Cage 16, Inner ring 17, Gap A18, Gap B19, Gap C20. Detailed Embodiment

[0018] The present invention will be described in detail below in conjunction with the drawings:

[0019] Embodiment: As shown in the attached drawings, this low-torque labyrinth seal assembly mainly includes a skeleton A1, a skeleton B2, a skeleton C3, an outer rubber 4, a magnetic rubber 5, a lip A6, a lip B7, a lip C8, a protrusion 9, a cavity A10, a cavity B11, a cavity C12, a cavity D13, an outer ring 14, steel balls 15, a cage 16, an inner ring 17, a gap A18, a gap B19, and a gap C20. The outer ring 14 is assembled with the inner ring 17 through the steel balls 15 held by the cage 16, and a raceway is formed between the outer ring 14 and the inner ring 17. The inner side of the mouth of the outer ring 14 is connected to the skeleton A1, the outer side of the inner ring 17 is connected to the skeleton B2, and the skeleton B2 is connected to the skeleton C3 with an interference fit on the outer side. The skeleton A1, the skeleton B2, and the skeleton C3 are nested and matched with each other. The magnetic rubber 5 is wrapped on the skeleton B2, which can transmit magnetic signals. At the same time, the magnetic rubber 5 contacts the inner ring 17 to play a pre-sealing role. The outer rubber 4 is wrapped on the skeleton A1. The outer rubber 4 is provided with a protrusion 9 that is press-fitted with an interference fit with the outer ring 14 to form a pre-seal to prevent mud, water, and dust from entering the raceway. The outer rubber 4 is provided with a lip A6, a lip B7, and a lip C8. A cavity A10 is formed above the lip A6, a cavity B11 is formed between the lip A6 and the lip B7, a cavity C12 is formed between the lip B7 and the lip C8, a cavity D13 is formed between the skeleton B2 and the skeleton C3, a gap A18 is formed between the lip A6 and the magnetic rubber 5, a gap B19 is formed between the lip A6 and the skeleton C3, and a gap C20 is formed between the magnetic rubber 5 and the outer rubber 4. The width dimension ranges of the gaps A18, B19, and C20 are all 0.1 - 0.7 mm. The gap C20 guides water flow into the cavity A10 to avoid the direct influx of water flow. The cavity A10 can store water briefly when a large amount of mud and water surges in, preventing the invasion of mud and water, and flowing down along the inner wall under the action of gravity and being discharged in time.

[0020] The skeleton A1 applies a labyrinth design, generating a labyrinth effect with the skeleton C3. When the skeleton C3 is press-fitted with the lip A6, it is axially aligned. The width d of the channel formed between the skeleton C3 and the skeleton B2 ranges from 0.1 to 0.7 mm. The skeleton C3 applies a skeleton folding design to raise the lip position.

[0021] The lip A6 does not contact the skeleton C3 in the natural state, and there is a small gap B19 between them. The lip B7 is in an interference contact with the skeleton C3 in the natural state, and the contact angle α between them ranges from 0° to 160°. The lip C8 is in a just-contact state without interference with the skeleton C3 in the natural state, and the contact angle β between them ranges from 0° to 160°.

[0022] Working principle of the present invention: When muddy water surges in, the muddy water that is difficult to store in cavity A10 will enter cavity D13 formed by framework B2 and framework C3 through gap A18 and be discharged in time. The lip A6 does not contact framework C3 in the natural state, and there is a small gap B19 between them, which can effectively reduce the splashing of the muddy water that stays briefly in the cavity into cavity B11. Only a very small amount of muddy water will splash into cavity B11 through gap B19 during the process of muddy water surging in and being thrown out. The lip B7 is in interference contact with framework C3 in the natural state, and the contact angle is α, which serves as the first line of defense against muddy water entering the track. By designing α and adjusting the interference amount, a more ideal sealing effect can be achieved.

[0023] A small amount of muddy water that enters cavity B11 and stays briefly will seep into cavity C12 in a small amount during the rotation and operation of the bearing. The lip C8 is in a just-contact state with framework C3 in the natural state, without interference. The contact angle between lip C8 and framework C3 is β, which serves as an oil-retaining lip to prevent external muddy water from entering the bearing and at the same time prevent a large amount of lubricating grease in the raceway from leaking, improving the sealing performance. By designing β, the interference amount can be adjusted to prevent grease leakage and the intrusion of foreign objects from outside, achieving an ideal sealing effect. The framework A1 applies a labyrinth design, generating a labyrinth effect with framework C3, increasing the path length of muddy water intrusion, and thus increasing the difficulty of muddy water intrusion.

[0024] While realizing short-term water storage, cavity D13 can effectively reduce the risk of muddy water entering the raceway and discharge the muddy water in time. By structural design, the position of the lip is raised to reduce the possibility of muddy water entering cavity B11 and cavity C12. A very small amount of muddy water splashes into cavity B11 before entering and discharging from the sealing component, greatly reducing the amount of muddy water in contact with the lip and reducing the risk of infiltration.

[0025] It can be understood that for those skilled in the art, equivalent replacement or change of the technical solution and inventive concept of the present invention should fall within the protection scope of the claims attached to the present invention.

Claims

1. A low-torque labyrinth seal assembly, characterized in that: It includes a skeleton A (1), a skeleton B (2), a skeleton C (3), an outer rubber coating (4), a magnetic rubber (5), a lip A (6), a lip B (7), a lip C (8), a cavity A (10), a cavity B (11), a cavity C (12), a cavity D (13), an outer ring (14), steel balls (15), a cage (16), an inner ring (17), a gap A (18), a gap B (19), and a gap C (20). The outer ring (14) is assembled with the inner ring (17) through the steel balls (15) held by the cage (16), and a raceway is formed between the outer ring (14) and the inner ring (17). The inner side of the mouth of the outer ring (14) is connected to the skeleton A (1), and the outer side of the inner ring (17) is connected to the skeleton B (2). The skeleton B (2) is connected to the skeleton C (3) with an interference fit on the outer side. The skeleton A (1), the skeleton B (2), and the skeleton C (3) are nested and matched with each other. The magnetic rubber (5) is wrapped on the skeleton B (2) and contacts the inner ring (17). The outer rubber coating (4) is wrapped on the skeleton A (1). The outer rubber coating (4) is provided with a protrusion (9) that is press-fitted with the outer ring (14) with an interference fit. The outer rubber coating (4) is provided with a lip A (6), a lip B (7), and a lip C (8). A cavity A (10) is formed above the lip A (6), a cavity B (11) is formed between the lip A (6) and the lip B (7), a cavity C (12) is formed between the lip B (7) and the lip C (8), a cavity D (13) is formed between the skeleton B (2) and the skeleton C (3), a gap A (18) is formed between the lip A (6) and the magnetic rubber (5), a gap B (19) is formed between the lip A (6) and the skeleton C (3), and a gap C (20) is formed between the magnetic rubber (5) and the outer rubber coating (4); The skeleton A (1) applies a labyrinth design, generating a labyrinth effect with the skeleton C (3); The skeleton C (3) applies a skeleton folding design to raise the position of the lip; 2. The low-torque labyrinth seal assembly according to claim 1, characterized in that: The lip A (6) does not contact the skeleton C (3) in the natural state, and there is a small gap B (19) between them; 3. The low-torque labyrinth seal assembly according to claim 1, wherein: The lip B (7) is in interference contact with the skeleton C (3) in the natural state, and the contact angle α between them ranges from 0° to 160°; 4. The low-torque labyrinth seal assembly according to claim 1, characterized in that: The lip C (8) is in a just-contact state without interference with the skeleton C (3) in the natural state, and the contact angle β between them ranges from 0° to 160°; 5. The low-torque labyrinth seal assembly according to claim 1, wherein: When the skeleton C (3) is press-fitted with the lip A (6), they are axially aligned, and the channel width d formed between the skeleton C (3) and the skeleton B (2) ranges from 0.1 to 0.7 mm; 6. The low-torque labyrinth seal assembly according to claim 1, characterized in that: The width dimension ranges of the gap A (18), the gap B (19), and the gap C (20) are all from 0.1 to 0.7 mm.

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