Bearing sealing element with double-convex-edge W-shaped outer lip

Abstract

The utility model discloses a sealing element for a bearing with a double-convex-edge W-shaped outer lip, the bearing comprises an outer ring and an inner ring, a mounting space is formed between the outer ring and the inner ring, and the sealing element comprises a sealing body arranged in the mounting space and a framework embedded in the sealing body; the periphery of the sealing body is mounted on the outer ring; a channel is formed in the periphery of the inner ring and comprises a vertical inner wall and an outer wall inclining outwards. From the center of the mounting space to the outside, the inner circumference of the sealing body is sequentially forked to form an inner lip, a middle lip and an outer lip, the inner lip is in clearance fit with the inner ring, the middle lip and the outer lip extend into the channel, the middle lip is in clearance fit with the inner wall of the channel, two convex edges are arranged along the outer lip and extrude the outer wall of the channel, and a containing cavity is formed between the two convex edges and the outer wall of the channel. According to the bearing sealing piece with the double-convex-edge W-shaped outer lip, the temperature rise is reduced, and the good sealing performance is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sealing element for bearing, especially to a sealing element for bearing with double convex edge W type outer lip. BACKGROUND

[0002] The existing bearing includes an inner ring, an outer ring, and a plurality of steel balls arranged between the inner ring and the outer ring, the bearing is provided with lubricating grease, and a sealing element is installed between the inner ring and the outer ring to prevent the internal lubricating grease from leaking out.

[0003] The existing sealing element is shown in the patent with the application number CN201720367002.3, which includes a sealing body, and an outer lip, a middle lip and an inner lip arranged from outside to inside on the inner side of the sealing body, the outer side of the sealing body is installed on the outer ring, and the outer lip, the middle lip and the inner lip are all in clearance fit with the inner ring, this kind of sealing element can reduce the temperature rise of the bearing, but the sealing performance is poor.

[0004] As shown in the patent with the application number CN202322870593.4, the outer side of the sealing element is installed on the outer ring, and the inner side of the sealing element is attached to the inner ring, although the sealing performance is improved, the contact area between the sealing element and the inner ring is large, and the temperature rise is serious when the bearing is running at high speed, and the sealing element is severely worn. SUMMARY

[0005] The utility model discloses a kind of sealing elements for bearing with double convex edge W type outer lip, reduce temperature rise, and have good sealing performance, to solve the defects that the existing sealing element temperature rise is serious, or sealing performance is poor.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A kind of sealing element for bearing with double convex edge W type outer lip, bearing includes outer ring and inner ring, outer ring and inner ring form installation space between, sealing element includes the sealing body being arranged in installation space, and the framework being inlaid in sealing body;The outer periphery of sealing body is installed on outer ring;Inner ring outer periphery is provided with channel, and channel includes vertical inner wall and outwardly inclined outer wall;From the center of installation space outward, the inner periphery of sealing body is bifurcated to form inner lip, middle lip and outer lip in turn, inner lip is in clearance fit with inner ring, middle lip and outer lip extend into channel, middle lip is in clearance fit with channel inner wall, two convex edges are provided along outer lip, two convex edges extrude channel outer wall, and accommodating cavity is formed between two convex edges and channel outer wall.

[0008] With the above configuration, the raised edges on the inner lip, middle lip, and outer lip prevent the grease inside the bearing from leaking out. The raised edges press against the outer wall of the groove, improving the sealing performance of the seal. The inner lip and middle lip do not contact the inner ring, and the raised edges are basically in point contact with the outer wall of the groove, resulting in a smaller contact area and reducing the friction between the seal and the inner ring, thus reducing temperature rise. In addition, the two raised edges form a cavity with the outer wall of the groove, which can accommodate foreign objects and reduce bearing wear.

[0009] Furthermore, the cross-section of the convex edge is basically triangular, and the width of the convex edge gradually decreases from the outer lip to the outer wall of the channel, forming a sealing angle that is pressed against the outer wall of the channel.

[0010] The above settings further reduce the contact area between the convex edge and the outer wall of the channel.

[0011] Furthermore, the compression of the sealing angle on the outer wall of the channel is less than or equal to 0.1 mm.

[0012] With the above settings, the sealing angle ensures a tight seal while minimizing the contact area with the inner ring to reduce temperature rise.

[0013] Furthermore, the side of the sealing body closest to the center of the mounting space is located on the first plane, and the side of the sealing body furthest from the center of the mounting space is located on the second plane parallel to the first plane. The outer lip and the protruding edge are located between the first plane and the second plane.

[0014] With the above settings, the centrifugal deformation of the outer lip is reduced when the seal rotates, so as to prevent the sealing performance from weakening.

[0015] Furthermore, the free end of the middle lip faces the inner wall of the channel and is inclined towards the inner ring axis. The outer wall of the channel extends outward on the side near the outer ring to form a first cylindrical surface. The end of the middle lip near the inner ring axis is located outside the first cylindrical surface. The inner wall of the channel extends inward on the side near the outer ring to form a second cylindrical surface. The second cylindrical surface is located outside the first cylindrical surface. The free end of the inner lip is inclined towards the inner ring axis and is located outside the second cylindrical surface.

[0016] The above settings facilitate the installation of the seal. During installation, the inner lip and middle lip do not contact the inner ring, preventing deformation of the inner lip and middle lip after installation.

[0017] Furthermore, the minimum gap width between the middle lip and the inner wall of the channel is less than or equal to 0.2 mm.

[0018] The above settings ensure a good seal for the middle lip.

[0019] Furthermore, the minimum gap width between the inner lip and the outer wall of the inner ring is less than or equal to 0.2 mm.

[0020] The above settings ensure a good seal on the inner lip.

[0021] Further, an installation groove is arranged along the inner periphery of the outer ring, and the outer periphery of the sealing body is embedded in the installation groove.

[0022] Through the above arrangement, the sealing body is clamped in the outer ring through the installation groove.

[0023] Further, a chamfer is arranged on the outer periphery of the sealing body close to the center of the installation space.

[0024] Through the above arrangement, the sealing body is clamped in the outer ring through the installation groove. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is an installation schematic diagram of the sealing member of the embodiment.

[0026] Figure 2 It is an enlarged view of A of Figure 1

[0027] Figure 3 It is an enlarged view of B of Figure 2

[0028] Figure 4 It is a schematic diagram of the sealing member of the embodiment. DETAILED DESCRIPTION

[0029] The technical scheme of the present application will be further specifically explained below through the embodiment and in combination with the drawings.

[0030] As shown in Figures 1 to 4 , a bearing sealing member with double convex edge W-shaped outer lip, the bearing includes an outer ring 3 and an inner ring 4, an installation space 5 is formed between the outer ring 3 and the inner ring 4, the sealing member includes a sealing body 6 arranged in the installation space 5, and a skeleton 7 embedded in the sealing body 6; the outer periphery of the sealing body 6 is installed on the outer ring 3; the outer periphery of the inner ring 4 is provided with a channel 8, the channel 8 includes a vertical inner wall 81 and an outwardly inclined outer wall 82; from the center of the installation space 5 outward, the inner periphery of the sealing body 6 is bifurcated to form an inner lip 9, a middle lip 10 and an outer lip 11 in turn, the inner lip 9 is in clearance fit with the inner ring 4, the middle lip 10 and the outer lip 11 extend into the channel 8, the middle lip 10 is in clearance fit with the inner wall of the channel 8, two convex edges 12 are arranged along the outer lip 11, the two convex edges 12 extrude the outer wall of the channel 8, and the accommodation cavity 13 is formed between the two convex edges 12 and the outer wall of the channel 8.

[0031] ​​With the above configuration, the protruding edges 12 on the inner lip 9, middle lip 10, and outer lip 11 can prevent the grease inside the bearing from leaking out. The protruding edges 12 press against the outer wall of the groove 8, improving the sealing performance of the seal. The inner lip 9 and middle lip 10 do not contact the inner ring 4, and the protruding edges 12 are basically in point contact with the outer wall of the groove 8, with a smaller contact area, reducing the friction between the seal and the inner ring 4 to reduce temperature rise. In addition, the two protruding edges 12 form a receiving cavity 13 with the outer wall of the groove 8, which can accommodate foreign objects to reduce bearing wear.

[0032] The bearing of this application, such as a ball bearing, includes an inner ring 4 and an outer ring 3 arranged coaxially, forming an annular mounting space 5 between them. Figure 2 As shown, a seal is installed on each of the left and right sides of the installation space to prevent grease leakage from the installation space; the frame 7 is made of annular metal, which increases the rigidity of the seal; the sealing body 6 is made of annular rubber, which has good elasticity. The outer circumference is installed on the outer ring 3 and rotates with the outer ring 3. The inner circumference contacts the inner ring 4 through the two protruding edges 12 of the outer lip 11. The two protruding edges 12 basically form a W-shaped outline, and the contact area with the inner ring 4 is smaller, which improves the sealing performance while minimizing the temperature rise; the two protruding edges 12 form two lines of defense on the inner ring 4. Foreign objects are easily stuck in the receiving cavity 13 after passing through the first protruding edge 12, making it more difficult for foreign objects from the outside to enter the bearing, thereby reducing bearing wear and improving bearing durability.

[0033] As one implementation method, the cross-section of the protruding edge 12 is basically triangular. From the outer lip 11 to the outer wall of the channel 8, the width of the protruding edge 12 gradually decreases and forms a sealing angle 14 that is pressed against the outer wall of the channel 8.

[0034] The above settings further reduce the contact area between the protruding edge 12 and the outer wall of the channel 8.

[0035] As one implementation method, the compression of the sealing angle 14 on the outer wall of the channel 8 is less than or equal to 0.1 mm.

[0036] With the above settings, the sealing angle 14 ensures a tight seal while minimizing the contact area with the inner ring 4 to reduce temperature rise.

[0037] In one implementation, the side of the sealing body 6 closest to the center of the mounting space 5 is located on the first plane 15, and the side of the sealing body 6 furthest from the center of the mounting space 5 is located on the second plane 16 parallel to the first plane 15. The outer lip 11 and the protruding edge 12 are located between the first plane 15 and the second plane 16.

[0038] With the above settings, the centrifugal deformation of the outer lip 11 is reduced when the seal rotates, so as to prevent the sealing performance from weakening.

[0039] The outer lip 11 of the application has small inclination, and when the seal rotates, the outer lip 11 is not easy to deform outwardly under the centrifugal force, that is, the convex strips are not easy to separate from the outer wall of the groove 8, thereby ensuring the sealing performance.

[0040] As an implementation form, the free end of the middle lip 10 is inclined toward the inner wall of the groove 8 and the axis of the inner ring 4, the side of the outer wall of the groove 8 close to the outer ring 3 extends outwardly to form a first cylindrical surface 17, and the end of the middle lip 10 close to the axis of the inner ring 4 is located outside the first cylindrical surface 17; the side of the inner wall of the groove 8 close to the outer ring 3 extends inwardly to form a second cylindrical surface 18, the second cylindrical surface 18 is located outside the first cylindrical surface 17, and the free end of the inner lip 9 is inclined toward the axis of the inner ring 4 and is located outside the second cylindrical surface 18.

[0041] Through the above arrangement, the seal is convenient to install, and when installed, the inner lip 9 and the middle lip 10 do not contact the inner ring 4, thereby preventing the inner lip 9 and the middle lip 10 from deforming after being installed in place.

[0042] The first cylindrical surface 17 and the second cylindrical surface 18 of the application are coaxial with the inner ring 4, the second cylindrical surface 18 is located on the side of the first cylindrical surface 17 close to the outer ring 3, the free ends of the inner lip 9, the middle lip 10 and the outer lip 11 gradually approach the axis of the inner ring 4, the free end of the middle lip 10 is between the first cylindrical surface 17 and the second cylindrical surface 18, the free end of the outer lip 11 is located inside the first cylindrical surface 17, and the free end of the inner lip 9 is located outside the second cylindrical surface 18; when the seal is installed, it is pressed inwardly into the installation space 5, the outer side of the sealing body 6 is clamped on the inner side of the outer ring 3, and the outer lip 11 is deformed and then clamped into the groove 8, the two convex strips are pressed on the outer wall of the groove 8, and the entire process is that the inner lip 9 and the middle lip 10 do not contact the inner ring 4, thereby preventing the inner lip 9 and the middle lip 10 from deforming and being installed out of place.

[0043] As an implementation form, the minimum gap width of the middle lip 10 to the inner wall of the groove 8 is less than or equal to 0.2 mm.

[0044] Through the above arrangement, the middle lip 10 has good sealing performance.

[0045] As an implementation form, the minimum gap width of the inner lip 9 to the outer wall of the inner ring 4 is less than or equal to 0.2 mm.

[0046] Through the above arrangement, the inner lip 9 has good sealing performance.

[0047] As an implementation form, an installation groove 19 is arranged along the inner periphery of the outer ring 3, and the outer periphery of the sealing body 6 is embedded into the installation groove 19.

[0048] Through the above arrangement, the sealing body 6 is clamped in the outer ring 3 through the installation groove 19.

[0049] As an implementation form, a chamfer 20 is arranged on the outer periphery of the sealing body 6 close to the side of the center of the installation space 5.

[0050] With the above arrangement, the sealing body 6 is conveniently fitted into the installation space 5.

[0051] It should be understood that, for one of ordinary skill in the art, improvements and modifications can be made according to the above description, and all such improvements and modifications shall fall within the protection scope of the appended claims of the present application.

Claims

1. A bearing seal with a double-convex W-shaped outer lip, characterized in that, The bearing includes an outer ring and an inner ring, with an installation space formed between them. The seal includes a sealing body disposed in the installation space and a skeleton embedded in the sealing body. The outer periphery of the sealing body is mounted on the outer ring. A groove is provided on the outer periphery of the inner ring, the groove including a vertical inner wall and an outwardly inclined outer wall. From the center of the installation space outward, the inner periphery of the sealing body branches sequentially to form an inner lip, a middle lip, and an outer lip. The inner lip is clearance-fitted with the inner ring, the middle lip and the outer lip extend into the groove, the middle lip is clearance-fitted with the inner wall of the groove, and two protruding edges are provided along the outer lip. The two protruding edges press against the outer wall of the groove, and a receiving cavity is formed between the two protruding edges and the outer wall of the groove.

2. A bearing seal with a double-convex W-shaped outer lip according to claim 1, characterized in that, The cross-section of the protruding edge is basically triangular. From the outer lip to the outer wall of the channel, the width of the protruding edge gradually decreases and forms a sealing angle that is pressed against the outer wall of the channel.

3. A bearing seal with a double-convex W-shaped outer lip according to claim 2, characterized in that, The compression of the sealing angle on the outer wall of the channel is less than or equal to 0.1 mm.

4. A bearing seal with a double-convex W-shaped outer lip according to claim 3, characterized in that, The side of the sealing body closest to the center of the mounting space is located on a first plane, and the side of the sealing body furthest from the center of the mounting space is located on a second plane parallel to the first plane. The outer lip and the protruding edge are located between the first plane and the second plane.

5. A bearing seal with a double-convex W-shaped outer lip according to claim 4, characterized in that, The free end of the middle lip faces the inner wall of the channel and is inclined towards the inner ring axis. The outer wall of the channel extends outward to form a first cylindrical surface on the side near the outer ring. The end of the middle lip near the inner ring axis is located outside the first cylindrical surface. The inner wall of the channel extends inward to form a second cylindrical surface on the side near the outer ring. The second cylindrical surface is located outside the first cylindrical surface. The free end of the inner lip is inclined towards the inner ring axis and is located outside the second cylindrical surface.

6. A bearing seal with a double-convex W-shaped outer lip according to claim 1, characterized in that, The minimum gap width between the middle lip and the inner wall of the channel is less than or equal to 0.2 mm.

7. A bearing seal with a double-convex W-shaped outer lip according to claim 1, characterized in that, The minimum gap width between the inner lip and the outer wall of the inner ring is less than or equal to 0.2 mm.

8. A bearing seal with a double-convex W-shaped outer lip according to claim 1, characterized in that, An installation groove is provided along the inner circumference of the outer ring, and the outer circumference of the sealing body is embedded in the installation groove.

9. A bearing seal with a double-convex W-shaped outer lip according to claim 1, characterized in that, The outer periphery of the sealing body is chamfered on the side near the center of the installation space.

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