Bearing sealing device, bearing and harmonic reducer

Abstract

The invention relates to a bearing sealing device, a bearing and a harmonic reducer, and the bearing sealing device comprises a framework which comprises a first end and a second end in the radial direction, and the first end of the framework is used for being fixed to a first ring of the bearing; the sealing body is attached to the framework and used for abutting against a second ring of the bearing at the second end of the framework; wherein a first protruding part is arranged on the axial outer side of the sealing body, and a first contact face is arranged on the side, close to the first end of the framework, of the first protruding part in the radial direction. The first protruding part extends in the axial direction, the axial length of the sealing body is increased, the path for blocking grease leakage is prolonged in the axial direction, the first contact face is used for abutting against the outer wall of the rotating shaft, grease leakage can be further prevented, and the sealing performance of the bearing can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing, and in particular to a bearing sealing device, a bearing and a harmonic reducer. Background Art

[0002] The harmonic reducer in the related art is usually equipped with multiple sealing rings to prevent grease leakage. The harmonic reducer may include a rotating shaft and a bearing, the bearing sleeve is arranged outside the rotating shaft, and two seals S1 and S2 are arranged at both axial ends of the bearing and a seal S3 is arranged at the axial end of the rotating shaft. The two seals S1 and S2 are used to prevent lubricating grease from entering the bearing. The seals S1, S2, and S3 are used together to prevent grease leakage in the harmonic reducer.

[0003] However, as the rotating shaft rotates at high speed, a large amount of lubricating grease is thrown out of the cavity near the seal S1 on one side of the axial direction. Under the inertial pressure of a large amount of lubricating grease, both contact type and non-contact type thin seal rings can easily allow the lubricating grease to enter the inside of the bearing, and continue to pass through the seal S2 on the other side of the axial direction, and finally leak to the outside of the harmonic reducer through the seal S3. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present invention provides a bearing sealing device, a bearing and a harmonic reducer.

[0005] According to a first aspect of an embodiment of the present invention, the present invention provides a bearing sealing device, comprising: a skeleton, radially comprising a first end and a second end, the first end of the skeleton being used to be fixed to a first ring of a bearing; a sealing body, attached to the skeleton and used to abut against the second ring of the bearing at the second end of the skeleton; wherein a first protrusion is provided on the axially outer side of the sealing body, and radially, the first protrusion is provided with a first contact surface on a side close to the first end of the skeleton.

[0006] In some embodiments, a second protrusion is further provided on the axial outer side of the sealing body, and the second protrusion is connected to the side of the first protrusion having the first contact surface, wherein the axial outer end surface of the second protrusion is provided with a second contact surface connected to the first contact surface.

[0007] In some embodiments, the first contact surface of the first protrusion is provided with one or more first annular protrusions; and / or the second contact surface of the second protrusion is provided with one or more second annular protrusions.

[0008] In some embodiments, the radial dimension of the first protrusion gradually decreases in a direction away from the skeleton.

[0009] In some embodiments, the first contact surface is an inclined plane or a concave arc surface.

[0010] In some embodiments, the axial cross-section of the first protrusion is substantially trapezoidal.

[0011] In some embodiments, the skeleton is in the shape of an annular plate and is made of spring steel material.

[0012] According to a second aspect of an embodiment of the present invention, the present invention provides a bearing, comprising: an outer ring; an inner ring, an annular groove being provided at one axial end of the inner ring; and a bearing sealing device as described in the first aspect, wherein the first end of the skeleton is located in the annular groove and fixed to the inner ring.

[0013] According to a third aspect of an embodiment of the present invention, the present invention provides a harmonic reducer, comprising: a rotating shaft, comprising a shoulder, wherein the shoulder is provided with an external chamfer; a bearing as described in the second aspect, wherein the inner ring of the bearing is torsionally connected to the rotating shaft, and the axial end of the inner ring having the annular groove abuts against the end face of the shoulder, wherein the first contact surface abuts against the external chamfer and has an interference fit.

[0014] In some embodiments, a second protrusion is further provided on the axial outer side of the sealing body, and the second protrusion is connected to the side of the first protrusion having the first contact surface, wherein the axial outer end surface of the second protrusion is provided with a second contact surface connected to the first contact surface, and the second contact surface is interference fit with the end surface of the shaft shoulder.

[0015] The technical solution provided by the embodiments of the present invention may include the following beneficial effects: the first protrusion extends axially, increasing the axial length of the sealing body, thereby extending the path for blocking grease leakage in the axial direction; the first contact surface is used to abut against the outer wall of the rotating shaft, which can further prevent grease leakage and improve the sealing performance of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] Figure 1 is a partial cross-sectional view of a harmonic reducer according to an exemplary embodiment;

[0018] Figure 2 yes Figure 1 A partial enlarged view of the bearing sealing device in FIG.

[0019] Figure 3 is a cross-sectional view of a bearing sealing device according to an exemplary embodiment. DETAILED DESCRIPTION

[0020] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0021] According to an embodiment of the present invention, the bearing sealing device is suitable for being installed in a bearing. In the present invention, unless otherwise specified, axial direction and radial direction refer to the axial direction and radial direction of the bearing respectively; axial outer side refers to Figure 3 The left side in the figure, the axial inner side refers to Figure 3 The radially outer side is Figures 1 to 3 The upper side, radial inner side refers to Figures 1 to 3 The lower side of the .

[0022] In addition, the term "torsionally resistant connection" refers to a connection between two elements in a manner that they do not rotate relative to each other, which can be achieved through a press fit (i.e., an interference fit) or by forming the two mentioned parts integrally. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0023] As is known to all, the bearing 100 can enable two rotating parts to rotate relative to each other. For example, the inner ring 20 of the bearing 100 is torsionally connected to the rotating shaft 200, and the outer ring 30 of the bearing 100 is torsionally connected to the inner wall of another rotating part 300, thereby realizing relative rotation between the rotating shaft 200 and the other rotating part 300.

[0024] If the rotating shaft 200 is a stepped shaft, that is, it includes a large shaft body 40 and a small shaft body 50 with different diameters, the stepped shaft includes a shoulder 60, that is, a portion where the cross-sectional dimensions of the large shaft body 40 and the small shaft body 50 change. The bearing inner ring 20 is torsionally connected to the small shaft body 50, and one axial end of the bearing inner ring 20 abuts against the end face 62 of the shoulder 60, thereby playing the role of axial limiting and fixing.

[0025] However, in the related art, the bearing seal device 10 between the bearing 100 and the shaft shoulder 60 does not have a matching relationship with the shaft shoulder 60, resulting in that the bearing seal device 10 cannot play a good sealing effect between the bearing 100 and the shaft shoulder 60, so that the outer part of the bearing 100 (such as Figure 1 The lubricating grease in the cavity 90 shown can easily enter the interior of the bearing 100.

[0026] In order to ensure the sealing performance of the bearing 100, it is necessary to set a bearing sealing device 10 at both axial ends of the bearing 100. In addition, when the rotating shaft 200 and the bearing 100 are both located in the housing of the filter reducer, it is also necessary to set an additional seal at the end of the rotating shaft 200 for sealing to prevent the lubricating grease passing through the two bearing sealing devices 10 from leaking to the outside of the housing, which increases the parts cost and the installation cost.

[0027] In order to solve the problem of grease leakage between the shoulder 60 of the stepped shaft and the inner ring 20 of the bearing, the present invention provides a bearing sealing device 10. The bearing sealing device 10 can be applied to one axial end of the bearing 100 (such as Figure 1 and Figure 2 As shown) or at both axial ends, to improve the sealing performance of the bearing 100 and prevent the leakage of lubricating grease.

[0028] Specifically, Figure 3 As shown, the bearing sealing device 10 includes a frame 11 and a sealing body 12 .

[0029] In some embodiments, the skeleton 11 is an annular plate structure made of spring steel material, and the sealing body 12 is an annular structure made of elastic material (such as rubber, etc.). The sealing body 12 can be attached and fixed to the skeleton 11 through a vulcanization process.

[0030] The spring steel skeleton 11 can make the entire bearing sealing device 10 elastically deformable, making it easy to assemble in the bearing 100 or to remove from the annular groove 21 of the bearing inner ring 20 described below. In addition, when the skeleton 11 is thin in the axial direction, plastic deformation hardly occurs, so that the sealing device can save more space in the axial direction.

[0031] Furthermore, the skeleton 11 includes a first end and a second end along the radial direction R, the first end of the skeleton 11 is used to be fixed with the first circle of the bearing 100, and the sealing body 12 attached to the second end of the skeleton 11 is used for non-fixed abutment with the second circle of the bearing 100, such as sliding abutment.

[0032] In this embodiment, the first end of the skeleton 11 may be the radial inner side, the first ring of the bearing 100 may be the inner ring 20 of the bearing 100, the second end of the skeleton 11 may be the radial outer side, and the second ring of the bearing 100 may be the outer ring 30 of the bearing 100. Therefore, in this specification, the radial inner side of the bearing sealing device 10 is fixedly connected to the inner ring 20 of the bearing 100, and the radial outer side of the bearing sealing device 10 is abutted against the outer ring 30 of the bearing 100.

[0033] Furthermore, an annular groove 21 is provided on the outer wall of the bearing inner ring 20, and the bearing sealing device 10 is inserted into the annular groove 21 after elastic deformation of the skeleton 11, and the radial inner side of the skeleton 11 and the annular groove 21 are interference fit to realize the fixed connection between the radial inner side of the bearing sealing device 10 and the bearing inner ring 20. At this time, the sealing body 12 of the bearing sealing device 10 can be slidably abutted against the outer ring 30 of the bearing 100, wherein the sliding abutment can be contact type (as shown in this embodiment) or non-contact type.

[0034] Furthermore, the sealing body 12 is provided with a first protrusion 121 on the axial outer side, that is, the sealing body 12 is provided with a first protrusion 121 on a side away from the rolling element 70 of the bearing 100. In the radial direction R, the first protrusion 121 is provided with a first contact surface 122 on a side close to the first end of the skeleton 11. In this embodiment, the first contact surface 122 is provided on the radial inner side of the first protrusion 121, and the first contact surface 122 abuts against the outer wall of the large shaft body 40.

[0035] The first protrusion 121 protrudes axially from the sealing body 12, and the first contact surface 122 of the first protrusion 121 abuts against the outer wall of the large shaft body 40 of the stepped shaft. When grease flows axially toward the bearing 100 in the cavity 90 of the outer wall of the large shaft body 40, on the one hand, the resistance to the flowing grease is increased and the flow speed of the grease is slowed down. On the other hand, the axial length and axial thickness of the sealing body 12 are increased, thereby extending the distance for blocking the flow of the grease, preventing the grease from flowing quickly and directly to the shoulder 60 position, and improving the sealing performance of the bearing 100.

[0036] Furthermore, a second protrusion 124 is provided on the axial outer side of the sealing body 12 , and the second protrusion 124 is connected to the side of the first protrusion 121 having the first contact surface 122 , wherein the axial outer end surface of the second protrusion 124 is provided with a second contact surface 125 connected to the first contact surface 122 .

[0037] In this embodiment, the second protrusion 124 is located radially inside the first protrusion 121, the second contact surface 125 is connected to the first contact surface 122, and the second contact surface 125 is used to abut against the end surface 62 of the shaft shoulder 60. It can be seen that the sealing body 12 abuts against the large shaft body 40 in the axial direction A and the radial direction R through the first contact surface 122 and the second contact surface 125, respectively, so as to further prevent the lubricating grease in the cavity 90 from flowing into the interior of the bearing 100, thereby improving the sealing performance of the bearing 100.

[0038] Furthermore, the first contact surface 122 may be interference fit with the outer wall of the large shaft body 40, and / or the second contact surface 125 may be interference fit with the end surface 62 of the shaft shoulder 60. In this way, the seal body 12 may apply stress to the large shaft body 40 in the axial direction A and the radial direction R, so that the first protrusion 121 and the second protrusion 124 of the seal body 12 fit more closely, further improving the sealing performance of the bearing 100.

[0039] In some embodiments, an outer chamfer 61 may be provided at the shoulder 60, and the outer chamfer 61 may be a flat angle or a rounded angle. Therefore, in some embodiments, the first contact surface 122 may be an inclined plane corresponding to the flat angle or a concave arc surface corresponding to the rounded angle. By setting the first contact surface 122 as an inclined plane or a concave arc surface, the first contact surface 122 can better fit and abut the outer chamfer 61. By setting the outer chamfer 61 and the first contact surface 122 that cooperates with the outer chamfer 61, the path for blocking the flow of lubricating grease is further extended.

[0040] Furthermore, if Figure 3 As shown, the first contact surface 122 of the first protrusion 121 is provided with one or more first annular protrusions 123 ; and / or the second contact surface 125 of the second protrusion 124 is provided with one or more second annular protrusions 126 .

[0041] The first annular protrusion 123 can reduce the contact area between the first contact surface 122 and the outer wall or outer chamfer 61 of the large shaft body 40, and the second annular protrusion 126 can reduce the contact area between the second contact surface 125 and the end face 62 of the shaft shoulder 60, thereby reducing the contact stress between the sealing body 12 and the rotating shaft 200. When the sealing body 12 and the rotating shaft 200 have a tendency to rotate relative to each other, the wear between the two can be reduced, thereby extending the service life.

[0042] In addition, multiple first annular protrusions 123 can form multiple first annular grooves 127 arranged in parallel along the axial direction, and multiple second annular protrusions 126 can form multiple second annular grooves 21 arranged along the radial direction R. The first annular grooves 127 and the second annular grooves 128 can store lubricating grease and have the effect of slowing down the flow rate of the lubricating grease.

[0043] In some embodiments, the radial dimension of the first protrusion 121 remains unchanged along the axial direction A. In this embodiment, the first protrusion 121 has an inclined first contact surface 122, and the first protrusion 121 gradually decreases in the direction away from the skeleton 11. That is, the first protrusion 121 is thicker and thinner in the direction away from the skeleton 11, and the end of the first protrusion 121 close to the skeleton 11 is thicker, so that the first protrusion 121 is more solid, and the mass of the far end of the first protrusion 121 is prevented from being too large, causing the entire bearing sealing device 10 to be thrown out of the bearing 100 under the action of inertia.

[0044] Furthermore, if Figure 3 As shown, the first protrusion 121 may also be an inclined plane on one side close to the second end of the skeleton 11, that is, the radially outer side of the first protrusion 121 may also be an inclined plane, and the inclined plane may guide the lubricating grease in the cavity 90 to flow radially outward.

[0045] The sealing body 12 is provided with a primary sealing lip 13 and a secondary sealing lip 14 at the second end of the frame 11. The primary sealing lip 13 is inclined axially inward and is used for sliding contact with the inner wall of the outer ring 30 of the bearing 100. The secondary sealing lip 14 extends axially outward.

[0046] like Figure 3 It can be seen that the inclined plane on the radial outer side of the first protrusion 121 and the secondary sealing lip 14 form a swirl cavity. Under the action of inertia, the lubricating grease is thrown from the inclined plane on the radial outer side of the first protrusion 121 to the secondary sealing lip 14. The secondary sealing lip 14 can return the lubricating grease to the cavity 90 above the rotating shaft 200, thereby preventing the lubricating grease from penetrating into the interior of the bearing 100 from the radial outer side of the sealing body 12 and leaking from the bearing 100.

[0047] In some embodiments, the axial cross section of the first protrusion 121 is approximately trapezoidal, that is, the first protrusion 121 has no sharp corners at the end away from the frame 11, so that the first protrusion 121 can be too sharp at the end away from the frame 11, and the first protrusion 121 can be prevented from extending too long in the axial direction, which can not only save materials but also reduce the weight of the first protrusion 121.

[0048] The above is a detailed description of an example in which the radial inner side of the bearing sealing device 10 is fixed to the inner ring 20 of the bearing 100, and the radial outer side is in contact with the outer ring 30 of the bearing 100. In some other embodiments, the radial outer side of the bearing sealing device 10 may also be fixedly connected to the outer ring 30 of the bearing 100, and the radial inner side of the bearing sealing device 10 is in non-fixed contact with the inner ring 20 of the bearing 100. At this time, the first contact surface 122 of the first protrusion 121 is located on the radial outer side of the first protrusion 121, and the second protrusion 124 and the second contact surface 125 are both located on the radial outer side of the first protrusion 121. The working principle is the same and will not be repeated here.

[0049] In summary, the bearing sealing device 10 of the present invention is applied to the bearing 100 and is located between the bearing 100 and the shoulder 60 of the rotating shaft 200. It has good sealing performance and can eliminate the need to set seals at the other axial end of the bearing 100 and the end of the rotating shaft 200, thereby reducing costs.

[0050] Based on the same inventive concept, the present invention provides a bearing 100 and a harmonic reducer. The specific manner in which the functions of the bearing 100 and the harmonic reducer in the above embodiment are realized has been described in detail in the embodiment of the bearing sealing device 10, and will not be described in detail here.

[0051] It is to be understood that in the present invention, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0052] It is further understood that the terms "first", "second", etc. are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from each other, and do not indicate a specific order or importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present invention, a first structure can also be referred to as a second structure, and similarly, a second structure can also be referred to as a first structure.

[0053] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the following scope of rights.

[0054] It should be understood that the present invention is not limited to the precise structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the scope of the appended claims.

Claims

1. A bearing sealing device (10), characterized in that: include: A skeleton (11) comprising a first end and a second end in a radial direction, wherein the first end of the skeleton (11) is used to be fixed to a first ring (20) of a bearing (100); A sealing body (12) attached to the frame (11) and used for abutting against a second ring (30) of the bearing (100) at a second end of the frame (11); The sealing body (12) is provided with a first protruding portion (121) on the axial outer side thereof, and the first protruding portion (121) is provided with a first contact surface (122) on a side close to the first end of the frame (11) in the radial direction.

2. The bearing sealing device (10) according to claim 1, characterized in that: A second protruding portion (124) is further provided on the axial outer side of the sealing body (12), and the second protruding portion (124) is connected to a side of the first protruding portion (121) having the first contact surface (122). Wherein, the axial outer end surface of the second protruding portion (124) is provided with a second contact surface (125) connected to the first contact surface (122).

3. The bearing sealing device (10) according to claim 2, characterized in that: The first contact surface (122) of the first protruding portion (121) is provided with one or more first annular protrusions (123); and / or The second contact surface (125) of the second protruding portion (124) is provided with one or more second annular protrusions (126).

4. The bearing sealing device (10) according to claim 1, characterized in that: The radial dimension of the first protrusion (121) gradually decreases in a direction away from the frame (11).

5. The bearing sealing device (10) according to claim 4, characterized in that: The first contact surface (122) is an inclined plane or a concave arc surface.

6. The bearing sealing device (10) according to claim 4, characterized in that: The axial cross section of the first protrusion (121) is substantially trapezoidal.

7. The bearing sealing device (10) according to claim 1, characterized in that: The frame (11) is in the shape of an annular plate and is made of spring steel material.

8. A bearing (100), characterized in that: include: Outer ring (30); an inner ring (20), wherein an annular groove (21) is provided at one axial end of the inner ring (20); and According to the bearing sealing device (10) as claimed in any one of claims 1 to 7, the first end of the skeleton (11) is located in the annular groove (21) and is fixed to the inner ring (20).

9. A harmonic reducer, characterized in that: include: The rotating shaft (200) comprises a shaft shoulder (60), wherein the shaft shoulder (60) is provided with an outer chamfer (61); The bearing (100) according to claim 8, wherein the inner ring (20) of the bearing (100) is connected to the rotating shaft (200) in a torsion-proof manner, and an axial end of the inner ring (20) having the annular groove (21) abuts against an end face (62) of the shaft shoulder (60). Wherein, the first contact surface (122) abuts against the outer chamfer (61) and is interference fit.

10. The harmonic reducer according to claim 9, characterized in that: A second protruding portion (124) is further provided on the axial outer side of the sealing body (12), and the second protruding portion (124) is connected to a side of the first protruding portion (121) having the first contact surface (122). The axial outer end surface of the second protrusion (124) is provided with a second contact surface (125) connected to the first contact surface (122), and the second contact surface (125) is interference fit with the end surface (62) of the shaft shoulder (60).

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