Novel oil seal for bearing unit

Abstract

The invention relates to a novel oil seal for a bearing unit, which comprises an external sealing element and an internal sealing element which can rotate relatively, the external sealing element is hermetically connected with the inner wall of a bearing outer ring, and the internal sealing element is hermetically connected with a bearing inner ring; a first protective barrier is formed through the first bend arranged on the first metal framework, so that external silt is not prone to directly impacting the second sealing lip. And then through three-stage sealing of the second sealing lip, the third sealing lip and the fourth sealing lip, water vapor is prevented from entering. Three contact lips are arranged on the first sealing lip, and three-level sealing is achieved. The bearing further has the sealing effect that an integrated structure is formed by sealing of the annular protrusion and the bearing inner ring, sealing of the first sealing layer and the bearing outer ring and sealing of the second sealing layer, and a third sealing layer at the end of the supporting ring enables the first rubber layer to be connected with the supporting ring more firmly. The whole oil seal is provided with 11 sealing structures, rubber sealing is arranged on the outer periphery, the inner periphery and the end face, and water vapor can be prevented from entering the oil seal.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and specifically to a novel oil seal for bearing units. Background Technology

[0002] Bearings are essential components in modern machinery. Their primary function is to support rotating parts of the machine, reduce the coefficient of friction during movement, and ensure rotational accuracy. Bearings operate in various environments; for example, agricultural machinery operates in environments filled with moisture and sediment, requiring a seal between the outer and inner rings to prevent moisture and sediment from entering and affecting rotation. Traditional sealing caps or oil seals, with only one or several layers of sealing, are susceptible to damage in moisture- and sediment-rich environments, where sediment can easily break through the outer seal, allowing moisture to enter.

[0003] In view of this, the inventor conducted in-depth research on the aforementioned deficiencies in the prior art, which led to the creation of this case. Summary of the Invention

[0004] The main objective of this invention is to provide a novel oil seal for bearing units, which has the characteristic of improving the oil seal's ability to prevent the entry of external mud, sand, and moisture, thereby improving the sealing performance of the bearing.

[0005] To achieve the above objectives, the solution of the present invention is:

[0006] A novel oil seal for a bearing unit includes an external seal and an internal seal that can rotate relative to each other. The external seal is used for sealing connection with the inner wall of the outer ring of the bearing, and the internal seal is used for sealing connection with the inner ring of the bearing.

[0007] The external seal includes a first metal frame and a first adhesive layer partially covering the surface of the first metal frame. The first metal frame includes an outer ring body, a first bend connected to the outer end of the outer ring body, and a first retaining ring located at the inner end of the outer ring body. The first adhesive layer includes a first sealing layer, a first sealing lip, and a second sealing layer connecting the first sealing layer and the first sealing lip. The first sealing layer is located at the connection between the outer ring body and the first retaining ring, and the first sealing lip is located at the connection to the inner end of the first retaining ring. The first sealing lip has a first contact lip, a second contact lip, and a third contact lip. A clamping spring is also connected to the first sealing lip.

[0008] The internal seal includes a second metal skeleton and a second adhesive layer covering the outer surface of the second metal skeleton; the second metal skeleton includes an inner ring body, a second retaining ring, and a support ring connected in sequence; a plurality of annular protrusions are formed on the second adhesive layer at the inner ring body, which are arranged radially inward; a third sealing layer is provided on the support ring near the end of the first retaining ring; a second sealing lip, a third sealing lip, and a fourth sealing lip are formed on the second adhesive layer at the support ring; the second sealing lip, the third sealing lip, and the fourth sealing lip are arranged in sequence from the outside to the inside along the axial direction and are all in sealing contact with the inner wall of the outer ring body; the first retaining ring is located outside the second sealing lip and partially covers the second sealing lip; the first contact lip, the second contact lip, and the third contact lip are in sealing contact with the inner walls of the inner ring body, the second retaining ring, and the support ring, respectively.

[0009] Furthermore, a second bend is provided at the connection between the outer ring body and the first retaining ring, and the first sealing layer is formed in the recess formed by the second bend.

[0010] Furthermore, the first sealing layer has an angled shape.

[0011] Furthermore, the radial outer diameter of the first sealing layer is greater than the outer diameter of the outer ring body.

[0012] Furthermore, the second adhesive layer has a fourth sealing layer located at the end of the inner ring body.

[0013] Furthermore, the clamp spring is clamped onto the first contact lip to press the first contact lip tightly against the inner wall of the inner ring for a sealing contact.

[0014] Furthermore, the enclosing space between the second and third contact lips is filled with grease, and the enclosing space between the third and sixth contact lips is also filled with grease.

[0015] With the above structure, the oil seal for a bearing unit according to the present invention has at least the following beneficial effects:

[0016] First, a first protective barrier is formed by the first bend on the first metal frame, making it difficult for external mud and sand to directly impact the second sealing lip. Since the first bend is integrally connected to the outer ring, no additional connection is required, making assembly very convenient. Then, a three-stage seal through the second, third, and fourth sealing lips prevents moisture from entering. The first sealing lip has three contact lips, which achieve a three-stage seal with the inner wall of the second metal frame. It also features: a seal between the annular protrusion and the inner ring of the bearing; a seal between the first sealing layer and the outer ring of the bearing; a seal formed by the second sealing layer connecting the first sealing layer and the first sealing lip; and a sealing effect brought about by the third sealing layer at the end of the support ring, which makes the first adhesive layer more firmly connected to the support ring. The overall oil seal has 11 sealing structures, with rubber seals at the outer circumference, inner circumference, and end face, which can more effectively prevent moisture from entering.

[0017] Second, by incorporating a second bend, the first sealing layer can be made thicker, thus providing better elasticity for sealing with the outer ring of the bearing. The radial outer diameter of the first sealing layer is larger than the outer diameter of the outer ring body, also to improve the sealing effect with the inner wall of the bearing outer ring. The bevel on the first sealing layer facilitates the insertion of the oil seal between the outer and inner rings of the bearing.

[0018] Third, the fourth sealing layer enables the second adhesive layer to better adhere to the inner ring body, preventing the inner ring body from detaching from the second adhesive layer.

[0019] Compared with existing technologies, this invention improves the oil seal's ability to isolate moisture and sediment by setting multiple sealing structures, making the oil seal more adaptable to harsh working conditions filled with moisture and sediment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the rotating cross-sectional structure of the first embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the rotated cross-sectional structure of the external seal of the first embodiment of the present invention.

[0022] Figure 3 This is a rotating cross-sectional view of the internal seal of the first embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of a rotating cross-section of the second embodiment of the present invention.

[0024] In the picture:

[0025] External seal 10; First metal frame 1; Outer ring 11; First bend 12; First retaining ring 13; Second bend 14; First adhesive layer 2; First sealing layer 21; Bevel 211; Second sealing layer 22; First sealing lip 23; First contact lip 231; Second contact lip 232; Third contact lip 233; Hoop spring 24;

[0026] Internal seal 20; second metal skeleton 3; inner ring 31; second retaining ring 32; support ring 33; second adhesive layer 4; annular protrusion 41; third sealing layer 42; second sealing lip 43; third sealing lip 44; fourth sealing lip 45; fourth sealing layer 46. Detailed Implementation

[0027] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0028] like Figures 1 to 3 As shown, this invention relates to a novel oil seal for a bearing unit, comprising an external seal 10 and an internal seal 20 that are rotatable relative to each other. The external seal 10 is used for sealing connection with the inner wall of the bearing outer ring (not shown in the figure), and the internal seal 20 is used for sealing connection with the bearing inner ring.

[0029] The external seal 10 includes a first metal frame 1 and a first adhesive layer 2 partially covering the surface of the first metal frame 1. The first metal frame 1 includes an outer ring 11, a first bend 12 connected to the outer end of the outer ring 11, and a first retaining ring 13 located at the inner end of the outer ring 11. The first adhesive layer 2 includes a first sealing layer 21, a first sealing lip 23, and a second sealing layer 22 connecting the first sealing layer 21 and the first sealing lip 23. The first sealing layer 21 is located at the connection between the outer ring 11 and the first retaining ring 13, and the first sealing lip 23 is located at the inner end connected to the first retaining ring 13. The first sealing lip 23 has a first contact lip 231, a second contact lip 232, and a third contact lip 233. A clamp spring 24 is also connected to the first sealing lip 23.

[0030] The internal seal 20 includes a second metal skeleton 3 and a second adhesive layer 4 covering the outer surface of the second metal skeleton 3; the second metal skeleton 3 includes an inner ring 31, a second retaining ring 32 and a support ring 33 connected in sequence; a plurality of annular protrusions 41 are formed on the second adhesive layer 4 at the inner ring 31, which are arranged radially inward (i.e. towards the inner ring of the bearing); a third sealing layer 42 is provided on the support ring 33 near the end of the first retaining ring 13; a second sealing lip 43, a third sealing lip 44 and a fourth sealing lip 45 are formed on the second adhesive layer 4 at the support ring 33; the second sealing lip 43, the third sealing lip 44 and the fourth sealing lip 45 are arranged in sequence from the outside to the inside along the axial direction and are all in sealing contact with the inner wall of the outer ring 11; the first retaining ring 13 is located outside the second sealing lip 43 and partially covers the second sealing lip 43; the first contact lip 231, the second contact lip 232 and the third contact lip 233 are in sealing contact with the inner walls of the inner ring 31, the second retaining ring 32 and the support ring 33, respectively.

[0031] Thus, the oil seal for a novel bearing unit according to the present invention forms a first protective barrier through a first bend 12 on the first metal frame 1, making it difficult for external mud and sand to directly impact the second sealing lip 43. Since the first bend 12 is integrally connected to the outer ring 11, no additional connection is required, making assembly very convenient. Then, through a three-stage seal of the second sealing lip 43, the third sealing lip 44, and the fourth sealing lip 45, moisture ingress is prevented. The first sealing lip 23 has three contact lips, which achieve a three-stage seal with the inner wall of the second metal frame 3. It also features: a seal between the annular protrusion 41 and the inner ring of the bearing; a seal between the first sealing layer 21 and the outer ring of the bearing; a seal formed by the second sealing layer 22 connecting the first sealing layer 21 and the first sealing lip 23 to form an integral structure; and a sealing effect brought about by the third sealing layer 42 at the end of the support ring 33, which makes the first adhesive layer 2 more firmly connected to the support ring 33. The overall oil seal has 11 sealing structures, with rubber seals at the outer circumference, inner circumference, and end face, which can more effectively prevent moisture ingress.

[0032] Preferably, a second bend 14 is provided at the connection between the outer ring body 11 and the first retaining ring 13, and the first sealing layer 21 is formed in the recess formed by the second bend 14. By providing the second bend 14, the first sealing layer 21 can be made thicker, thus having a better elastic effect to seal with the outer ring of the bearing; the chamfer 211 on the first sealing layer 21 facilitates the oil seal being inserted between the outer ring and the inner ring of the bearing.

[0033] Preferably, the radial outer diameter of the first sealing layer 21 is larger than the outer diameter of the outer ring 11. After the outer ring 11 is installed, the first sealing layer 21 contacts the inner wall of the bearing outer ring, and the first sealing layer 21 is compressed, which can improve the sealing effect with the inner wall of the bearing outer ring.

[0034] Preferably, the second adhesive layer 4 has a fourth sealing layer 46 located at the end of the inner ring 31. The fourth sealing layer 46 allows the second adhesive layer 4 to better adhere to the inner ring 31, preventing detachment between the inner ring 31 and the second adhesive layer 4.

[0035] Preferably, the clamping spring 24 is clamped onto the first contact lip 231 to press the first contact lip 231 tightly against the inner wall of the inner ring 31 for a sealing contact. This allows the first contact lip 231 to achieve a tighter seal with the inner wall of the inner ring 31.

[0036] Preferably, in order to further improve the sealing effect, as a second embodiment of the present invention, such as Figure 4 As shown, based on Embodiment 1, the difference lies in that the lengths of the second sealing lip 43, the third sealing lip 44, and the fourth sealing lip 45 increase sequentially. Specifically, the outer circumferential diameters of the ends of the second sealing lip 43, the third sealing lip 44, and the fourth sealing lip 45 that contact the inner wall of the outer ring body 11 are the same, while the circumferential diameters corresponding to the diameters at the roots of the second sealing lip 43, the third sealing lip 44, and the fourth sealing lip 45 decrease sequentially. This makes the second sealing lip 43 less prone to bending than the third sealing lip 44, thus providing better resistance to mud and sand. The fourth sealing lip 45 is softer than the third sealing lip 44, allowing for a tighter fit against the inner wall of the outer ring body 11.

[0037] Preferably, the space between the second contact lip 232 and the third contact lip 233 is filled with grease, and the space between the third contact lip 233 and the sixth contact lip is also filled with grease. The grease facilitates smoother rotation between the outer seal 10 and the inner seal 20.

[0038] Compared with existing technologies, this invention improves the oil seal's ability to isolate moisture and sediment by setting multiple sealing structures, making the oil seal more adaptable to harsh working conditions filled with moisture and sediment.

[0039] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A novel oil seal for a bearing unit, characterized in that, It includes an external seal and an internal seal that are rotatable relative to each other, the external seal being used for a sealing connection with the inner wall of the outer ring of the bearing, and the internal seal being used for a sealing connection with the inner ring of the bearing; The external seal includes a first metal frame and a first adhesive layer partially covering the surface of the first metal frame. The first metal frame includes an outer ring body, a first bend connected to the outer end of the outer ring body, and a first retaining ring located at the inner end of the outer ring body. The first adhesive layer includes a first sealing layer, a first sealing lip, and a second sealing layer connecting the first sealing layer and the first sealing lip. The first sealing layer is located at the connection between the outer ring body and the first retaining ring, and the first sealing lip is located at the connection to the inner end of the first retaining ring. The first sealing lip has a first contact lip, a second contact lip, and a third contact lip. A clamping spring is also connected to the first sealing lip. The internal seal includes a second metal skeleton and a second adhesive layer covering the outer surface of the second metal skeleton; the second metal skeleton includes an inner ring body, a second retaining ring, and a support ring connected in sequence; a plurality of annular protrusions are formed on the second adhesive layer at the inner ring body, which are arranged radially inward; a third sealing layer is provided on the support ring near the end of the first retaining ring; a second sealing lip, a third sealing lip, and a fourth sealing lip are formed on the second adhesive layer at the support ring; the second sealing lip, the third sealing lip, and the fourth sealing lip are arranged in sequence from the outside to the inside along the axial direction and are all in sealing contact with the inner wall of the outer ring body; the first retaining ring is located outside the second sealing lip and partially covers the second sealing lip; the first contact lip, the second contact lip, and the third contact lip are in sealing contact with the inner walls of the inner ring body, the second retaining ring, and the support ring, respectively.

2. The novel oil seal for a bearing unit as described in claim 1, characterized in that, A second bend is provided at the connection between the outer ring and the first retaining ring, and the first sealing layer is formed in the recess formed by the second bend.

3. The novel oil seal for a bearing unit as described in claim 2, characterized in that, The first sealing layer has an angle.

4. The novel oil seal for a bearing unit as described in claim 2, characterized in that, The radial outer diameter of the first sealing layer is greater than the outer diameter of the outer ring body.

5. The novel oil seal for a bearing unit as described in claim 1, characterized in that, The second adhesive layer has a fourth sealing layer located at the end of the inner ring body.

6. The novel oil seal for a bearing unit as described in claim 1, characterized in that, The clamping spring is clamped onto the first contact lip to press the first contact lip tightly against the inner wall of the inner ring for a sealing contact.

7. The novel oil seal for a bearing unit as described in claim 1, characterized in that, The enclosing space between the second and third contact lips is filled with grease, and the enclosing space between the third and sixth contact lips is filled with grease.

Images