Labyrinth seal bearing

Abstract

The utility model discloses a labyrinth seal bearing which comprises an inner ring and an outer ring sleeved outside the inner ring, and further comprises a sealing main body which is in a circular ring shape and is arranged between the inner ring and the outer ring; the inner ring sealing part extends in the circumferential direction of the inner wall surface of the sealing main body, and the inner ring sealing part is in clearance fit with the outer wall surface of the inner ring; and the outer ring sealing part extends in the circumferential direction of the outer wall face of the sealing body, an outer ring sealing groove extending in the circumferential direction is formed in the inner wall face of the outer ring, and the outer ring sealing part is embedded in the outer ring sealing groove. The sealing part of the inner ring is not in contact with the outer wall surface of the inner ring, so that friction noise is avoided during operation, and the rotating speed of the bearing and the energy utilization efficiency of the bearing are not reduced; and external pollutants are prevented from immersing and internal lubricating grease is prevented from leaking by utilizing huge resistance generated when fluid flows in a narrow gap of which the direction is changed for multiple times.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and in particular to a labyrinth seal bearing. Background Technology

[0002] In recent years, due to the greenhouse effect, environmental awareness has gradually increased in various countries, leading to higher demands for reducing energy consumption and improving energy efficiency. For bearings, meeting these requirements necessitates reducing bearing torque, a need that is even more pronounced for sealed rolling bearings.

[0003] Currently, bearing seals typically employ contact-type sealing components. These components are embedded between the inner and outer rings of the bearing. To improve sealing performance and prevent the ingress of rainwater or mud, the interference fit of the sealing component is usually increased. However, increasing the interference fit increases bearing friction, thereby reducing bearing speed and hindering energy efficiency. Furthermore, the lip of the sealing component contacts the inner ring sealing groove; if the groove is machined flawed, frictional noise will occur during bearing operation, negatively impacting the user experience. Summary of the Invention

[0004] According to an embodiment of the present invention, a labyrinth seal bearing is provided, comprising an inner ring and an outer ring, wherein the outer ring is sleeved outside the inner ring, and further comprising:

[0005] The sealing body is annular and is positioned between the inner and outer rings;

[0006] The inner ring sealing part extends circumferentially along the inner wall surface of the sealing body, and the inner ring sealing part is clearance-fitted with the outer wall surface of the inner ring.

[0007] The outer ring sealing part extends circumferentially along the outer wall surface of the sealing body. The inner wall surface of the outer ring is provided with an outer ring sealing groove that extends circumferentially, and the outer ring sealing part is embedded in the outer ring sealing groove.

[0008] Furthermore, the outer wall surface of the inner ring is provided with an inner ring sealing groove that extends circumferentially, and the inner ring sealing groove is arranged opposite to the outer ring sealing groove;

[0009] The inner ring sealing groove divides the outer wall surface of the inner ring into a first outer wall surface and a second outer wall surface. The second outer wall surface is close to the end face of the inner ring, and the distance between the first outer wall surface and the inner wall surface of the inner ring is greater than the distance between the second outer wall surface and the inner wall surface of the inner ring.

[0010] The inner ring sealing groove has a groove bottom, a first groove wall and a second groove wall. The first groove wall and the second groove wall are inclined surfaces with opposite directions of inclination. The first groove wall is in contact with the first outer wall surface and the second groove wall is in contact with the second outer wall surface.

[0011] Furthermore, the inner ring sealing portion includes: an outer lip, a middle lip, and an inner lip;

[0012] The outer lip, middle lip, and inner lip are all located on the inner wall surface of the sealing body and are all clearance-fitted with the outer wall surface of the inner ring.

[0013] The middle lip is located between the inner lip and the outer lip. The middle lip is in clearance fit with the inner ring sealing groove, the outer lip is in clearance fit with the second outer wall surface, and the inner lip is in clearance fit with the first outer wall surface.

[0014] A first opening is provided between the inner lip and the middle lip, with the first opening facing the first groove wall; a second opening is provided between the outer lip and the middle lip, with the second opening facing the second groove wall.

[0015] Furthermore, the gap between the outer lip and the second outer wall surface is 0.15 mm.

[0016] Furthermore, the radial clearance between the inner lip and the first outer wall is 0.15 mm, and the axial clearance between the junction of the first outer wall and the first groove wall and the inner lip is 0.16 mm.

[0017] Furthermore, the middle lip has a bottom surface parallel to the bottom of the groove and an inclined surface parallel to the first groove wall, and the ratio of the width of the bottom surface to the width of the groove bottom is 0.6~0.65.

[0018] Furthermore, the ratio of the length of the inclined plane to the length of the first groove wall is 0.5 to 0.6.

[0019] Furthermore, the axial distance between the outer lip and the inner ring end face is b, and the axial distance between the junction of the second outer wall and the second groove wall and the inner ring end face is B, with the ratio of b to B being 0.75~0.8.

[0020] Furthermore, the sealing body, inner ring sealing part, and outer ring sealing part are all made of SPCC+NBR metal rubber composite plate.

[0021] Furthermore, it also includes: a plurality of balls, which are disposed between the inner ring and the outer ring.

[0022] According to the labyrinth seal bearing of this utility model embodiment, the inner ring sealing part does not contact the outer wall surface of the inner ring, so there will be no friction noise during operation, and the bearing speed and energy efficiency will not be reduced. The inner ring sealing part adopts a three-lip labyrinth seal, which uses the huge resistance generated when the fluid flows in a narrow gap with multiple changes of direction to prevent external contaminants from entering and internal grease from leaking.

[0023] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of a labyrinth seal bearing according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the sealing component of the labyrinth seal bearing according to an embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional schematic diagram of the inner ring sealing groove of the labyrinth seal bearing according to an embodiment of the present invention;

[0027] Figure 4 This is a cross-sectional schematic diagram of the inner ring sealing portion of the labyrinth seal bearing according to an embodiment of the present invention.

[0028] Reference numerals: Inner ring 1, Inner ring sealing groove 11, First outer wall surface 12, Second outer wall surface 13, Groove bottom 14, First groove wall 15, Second groove wall 16; Outer ring 2, Outer ring sealing groove 21; Ball bearing 3; Sealing body 4; Inner ring sealing part 5, Outer lip 51, Middle lip 52, Inner lip 53, First opening 54, Second opening 55; Outer ring sealing part 6. Detailed Implementation

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0030] First, combine Figures 1-4 The labyrinth seal bearing according to an embodiment of the present invention is used for sealing bearings and has a wide range of applications.

[0031] like Figures 1-4 As shown, the labyrinth seal bearing of this utility model embodiment includes an inner ring 1 and an outer ring 2, with the outer ring 2 sleeved outside the inner ring 1. It also includes a plurality of balls 3 and a pair of sealing components. The plurality of balls 3 are evenly spaced between the inner ring 1 and the outer ring 2, and the pair of sealing components are also disposed between the inner ring 1 and the outer ring 2, and are respectively disposed on both sides of the plurality of balls 3.

[0032] In this embodiment, the sealing component uses an SPCC+NBR metal-rubber composite plate to improve the reliability of the sealing component.

[0033] like Figures 1-4 As shown, in this embodiment, each sealing component includes: a sealing body 4, an inner ring sealing part 5, and an outer ring sealing part 6.

[0034] Specifically, such as Figures 1-4As shown, in this embodiment, the sealing body 4 is annular and is disposed between the inner ring 1 and the outer ring 2. The inner ring sealing part 5 extends circumferentially along the inner wall surface of the sealing body 4. The inner ring sealing part 5 is clearance-fitted with the outer wall surface of the inner ring 1, that is, the inner ring sealing part 5 does not contact the outer wall surface of the inner ring 1, so that there will be no friction noise during operation, and the bearing speed and energy efficiency will not be reduced. The inner ring sealing part 5 adopts a three-lip labyrinth seal, which uses the huge resistance generated when the fluid flows in the narrow gap with multiple changes of direction to prevent external contaminants from entering and internal grease from leaking. The outer ring sealing part 6 extends circumferentially along the outer wall surface of the sealing body 4. The inner wall surface of the outer ring 2 is provided with an outer ring sealing groove 21 that extends circumferentially. The outer ring sealing part 6 is embedded in the outer ring sealing groove 21 and is interference-fitted with the outer ring sealing groove 21 to fix the sealing component, prevent the sealing component from moving during operation, and form a static sealing barrier to completely prevent contaminants from entering through the interface between the sealing component and the outer ring 2.

[0035] Furthermore, such as Figures 1-4 As shown, in this embodiment, an inner ring sealing groove 11 extending circumferentially is formed on the outer wall surface of the inner ring 1. The inner ring sealing groove 11 is disposed opposite to the outer ring sealing groove 21. The inner ring sealing groove 11 divides the outer wall surface of the inner ring 1 into a first outer wall surface 12 and a second outer wall surface 13. The second outer wall surface 13 is close to the end face of the inner ring 1. The distance between the first outer wall surface 12 and the inner wall surface of the inner ring 1 is greater than the distance between the second outer wall surface 13 and the inner wall surface of the inner ring 1. That is, the distance between the first outer wall surface 12 and the inner wall surface of the inner ring 1 is greater than the distance between the second outer wall surface 13 and the inner wall surface of the inner ring 1. The thickness is relatively large, while the wall thickness at the second outer wall surface 13 is relatively small, making it more difficult for pollutants to enter the first outer wall surface 12; the inner ring sealing groove 11 has a groove bottom 14, a first groove wall 15 and a second groove wall 16. The first groove wall 15 and the second groove wall 16 are inclined surfaces with opposite inclination directions. The first groove wall 15 is connected to the first outer wall surface 12, and the second groove wall 16 is connected to the second outer wall surface 13. That is, the width of the groove bottom 14 of the inner ring sealing groove 11 is smaller than the width of the groove opening, and it is in the shape of a trumpet opening.

[0036] Furthermore, such as Figures 1-4As shown, in this embodiment, the inner ring sealing part 5 includes: an outer lip 51, a middle lip 52, and an inner lip 53; the outer lip 51, the middle lip 52, and the inner lip 53 are all disposed on the inner wall surface of the sealing body 4, and are all clearance-fitted with the outer wall surface of the inner ring 1; the middle lip 52 is disposed between the inner lip 53 and the outer lip 51, the middle lip 52 is clearance-fitted with the bottom 14 of the inner ring sealing groove 11, the outer lip 51 is clearance-fitted with the second outer wall surface 13, and the inner lip 53 is clearance-fitted with the first outer wall surface 12; a first opening 54 is provided between the inner lip 53 and the middle lip 52, the first opening 54 facing the first groove wall 15, and a second opening 55 is provided between the outer lip 51 and the middle lip 52, the second opening 55 facing the second groove wall 16. Three lines of defense are formed by the outer lip 51, the middle lip 52, and the inner lip 53. External contaminants must pass sequentially through the outer lip gap, the second opening 55, the middle lip gap, the first opening 54, and the inner lip gap to enter the bearing. Each gap and opening generates fluid resistance and changes the flow direction, greatly consuming the kinetic energy of the contaminants and making it difficult for them to penetrate. In this embodiment, the second opening 55 is arc-shaped, changing the flow direction of external contaminants.

[0037] Furthermore, such as Figures 1-4 As shown, in this embodiment, the gap C between the outer lip 51 and the second outer wall surface 13 is 0.15mm, which can block most foreign objects, ensure sealing, and reduce the torque of the bearing, thereby reducing its energy consumption.

[0038] Furthermore, such as Figures 1-4 As shown, in this embodiment, the radial gap e between the inner lip 53 and the first outer wall surface 12 is 0.15 mm, and the axial gap E between the junction of the first outer wall surface 12 and the first groove wall 15 and the inner lip 53 is 0.16 mm.

[0039] Furthermore, such as Figures 1-4 As shown, in this embodiment, the middle lip 52 has a bottom surface 521 parallel to the bottom of the groove 14 and an inclined surface 522 parallel to the first groove wall 15. The ratio of the width A of the bottom surface 521 to the width a of the bottom of the groove 14 is 0.6 to 0.65.

[0040] Furthermore, such as Figures 1-4 As shown, in this embodiment, the ratio of the length d of the inclined surface 522 to the length D of the first groove wall 15 is 0.5 to 0.6.

[0041] Furthermore, such as Figures 1-4 As shown, in this embodiment, the axial distance between the outer lip 51 and the end face of the inner ring 1 is b, and the axial distance between the junction of the second outer wall surface 13 and the second groove wall 16 and the end face of the inner ring 1 is B. The ratio of b to B is 0.75~0.8.

[0042] like Figure 3As shown, the gap C between the outer lip 51 and the inner ring 1 is only 0.15mm, which will block most of the external foreign objects. Even if some foreign objects enter, they will be blocked by the middle lip 52 at the first opening 54. During operation, under the action of centrifugal force, most of the foreign objects will be thrown out, and the remaining part will enter through the gap of the middle lip. Because the thickness of the first outer wall surface 12 is greater than that of the second outer wall surface 13, the foreign objects that enter the first opening 54 will also be blocked by the inner lip 53 when they are thrown outward under the action of centrifugal force, thus achieving a seal.

[0043] Taking the 6002 basic model bearing as an example, bearings with different sealing plate types were tested, and the relevant test results are as follows:

[0044] 1. Use a sound system to test if the bearing makes friction noise:

[0045] Type Number of tests Friction noise quantity Original contact rubber sealing plate 1000 35 Original non-contact sealing plate 1000 0 This utility model 1000 0

[0046] 2. Friction torque detection:

[0047] Unit: mN.m

[0048] Type Number of tests Frictional torque value (average) Original contact rubber sealing plate 10 1.1 Original non-contact sealing plate 10 0.7 This utility model 10 0.7

[0049] 3. Paint resistance test:

[0050] Type Number of tests Is there paint inside? Original contact rubber sealing plate 2 no Original non-contact sealing plate 2 yes This utility model 2 no

[0051] Above, refer to Figures 1-4 The present invention describes a labyrinth seal bearing according to an embodiment of the present invention, wherein the inner ring seal does not contact the outer wall surface of the inner ring, so that there is no frictional noise during operation, and the bearing speed and energy efficiency are not reduced. The inner ring seal adopts a three-lip labyrinth seal, which uses the huge resistance generated when the fluid flows in a narrow gap with multiple changes of direction to prevent external contaminants from entering and internal grease from leaking.

[0052] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes that element.

[0053] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A labyrinth seal bearing, comprising an inner ring and an outer ring, wherein the outer ring is sleeved outside the inner ring, characterized in that, Also includes: A sealing body, the sealing body being annular in shape and disposed between the inner ring and the outer ring; The inner ring sealing part extends circumferentially along the inner wall surface of the sealing body, and the inner ring sealing part is clearance-fitted with the outer wall surface of the inner ring. An outer ring sealing part is provided, which extends circumferentially along the outer wall surface of the sealing body. An outer ring sealing groove is provided on the inner wall surface of the outer ring, which extends circumferentially. The outer ring sealing part is embedded in the outer ring sealing groove.

2. The labyrinth seal bearing as described in claim 1, characterized in that, The outer wall surface of the inner ring is provided with an inner ring sealing groove that extends circumferentially, and the inner ring sealing groove is disposed opposite to the outer ring sealing groove; The inner ring sealing groove divides the outer wall surface of the inner ring into a first outer wall surface and a second outer wall surface. The second outer wall surface is close to the end face of the inner ring, and the distance between the first outer wall surface and the inner wall surface of the inner ring is greater than the distance between the second outer wall surface and the inner wall surface of the inner ring. The inner ring sealing groove has a groove bottom, a first groove wall and a second groove wall. The first groove wall and the second groove wall are inclined surfaces with opposite inclination directions. The first groove wall is in contact with the first outer wall surface and the second groove wall is in contact with the second outer wall surface.

3. The labyrinth seal bearing as described in claim 2, characterized in that, The inner ring sealing portion includes: an outer lip, a middle lip, and an inner lip; The outer lip, the middle lip, and the inner lip are all disposed on the inner wall surface of the sealing body and are all clearance-fitted with the outer wall surface of the inner ring. The middle lip is disposed between the inner lip and the outer lip. The middle lip is in clearance fit with the inner ring sealing groove, the outer lip is in clearance fit with the second outer wall surface, and the inner lip is in clearance fit with the first outer wall surface. A first opening is provided between the inner lip and the middle lip, the first opening facing the first groove wall; a second opening is provided between the outer lip and the middle lip, the second opening facing the second groove wall.

4. The labyrinth seal bearing as described in claim 3, characterized in that, The gap between the outer lip and the second outer wall surface is 0.15 mm.

5. The labyrinth seal bearing as described in claim 3, characterized in that, The radial gap between the inner lip and the first outer wall is 0.15 mm, and the axial gap between the junction of the first outer wall and the first groove wall and the inner lip is 0.16 mm.

6. The labyrinth seal bearing as described in claim 3, characterized in that, The middle lip has a bottom surface parallel to the bottom of the groove and an inclined surface parallel to the first groove wall, and the ratio of the width of the bottom surface to the width of the groove bottom is 0.6~0.

65.

7. The labyrinth seal bearing as described in claim 6, characterized in that, The ratio of the length of the inclined plane to the length of the first groove wall is 0.5 to 0.

6.

8. The labyrinth seal bearing as described in claim 3, characterized in that, The axial distance between the outer lip and the inner ring end face is b, and the axial distance between the junction of the second outer wall and the second groove wall and the inner ring end face is B. The ratio of b to B is 0.75 to 0.

8.

9. The labyrinth seal bearing as described in claim 1, characterized in that, The sealing body, the inner ring sealing part, and the outer ring sealing part are all made of SPCC+NBR metal-rubber composite plate.

10. The labyrinth seal bearing as described in claim 1, characterized in that, It also includes: a plurality of balls disposed between the inner ring and the outer ring.

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