slewing bearing

Abstract

The utility model discloses a slewing bearing, including the first side and second side of opposite setting along the thickness direction, slewing bearing still includes seat ring subassembly, rolling body, sealing assembly and pressing plate subassembly. Seat ring subassembly includes support inner ring and support outer ring, and support inner ring and support outer ring are connected through rolling body rotation. Sealing assembly includes first sealing strip, and first sealing strip is located first side and includes a plurality of first sealing lip. Pressing plate subassembly includes pressing plate part and mounting part, and pressing plate part is located first side and is contacted with first sealing strip, and is fixedly connected seat ring subassembly with pressing plate part through mounting part, to make first sealing strip and seat ring subassembly close contact. The utility model provides a slewing bearing, through increasing pressing plate subassembly in first sealing strip one side, adopts the mode of physical contact to provide stable fixed strength under the severe working condition, solved the failure problem of lower seal under the severe working condition.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, specifically to a slewing bearing. Background Technology

[0002] The lower seal of the slewing bearing is prone to sedimentation and abrasive wear due to long-term contact with pollutants such as water and silt, and is also affected by gravity. However, existing single-lip or multi-lip seal designs do not fully consider this special working condition difference.

[0003] Single-lip seals have a small lip contact area, making it difficult to prevent mud and water from entering the raceway, leading to grease contamination and wear on the raceway surface. While multi-lip seals improve the sealing level, the adhesive is prone to failure under temperature fluctuations and chemical corrosion, causing the seal to fall off. Fragments stuck in the raceway exacerbate friction damage.

[0004] Existing reinforcement measures, such as thickening the sealing strip or using elastic materials, can only delay failure in the short term and cannot resolve the contradiction between insufficient sealing force and material fatigue. Utility Model Content

[0005] This utility model provides a slewing bearing that can effectively fix the first sealing strip in the sealing assembly and ensure the sealing effect even under harsh working conditions.

[0006] In a first aspect, this utility model provides a slewing bearing, including a first side and a second side disposed opposite to each other along the thickness direction. The slewing bearing further includes: a bearing assembly, which includes an inner bearing ring and an outer bearing ring, the outer bearing ring being sleeved on the inner bearing ring, the inner bearing ring extending beyond the outer bearing ring from the first side and the outer bearing ring extending beyond the inner bearing ring from the second side; a rolling element, located between the outer bearing ring and the inner bearing ring, the inner bearing ring and the outer bearing ring being rotatably connected by the rolling element; a sealing assembly, installed on the bearing assembly, the sealing assembly including a first sealing strip, the first sealing strip being located on the first side and including multiple first sealing lips abutting against the outer side wall of the inner bearing ring; and a pressure plate assembly, installed on the bearing assembly and located on the first side, the pressure plate assembly including a pressure plate portion and a mounting portion extending from the pressure plate portion, the pressure plate portion being located on the side of the first sealing strip away from the bearing assembly and abutting against the first sealing strip, and the bearing assembly and the pressure plate portion being fixedly connected by the mounting portion so that the first sealing strip is in close contact with the bearing assembly.

[0007] The slewing bearing provided in this embodiment of the invention provides stable fixing strength under harsh working conditions by adding a pressure plate assembly to one side of the first sealing strip and using physical contact, thus solving the problem of sealing failure of the lower seal of the slewing bearing under harsh working conditions such as water wading and mud.

[0008] According to any embodiment provided in the first aspect of the present invention, the outer ring of the support includes a mounting groove formed on a first side, the main body of the first sealing strip is fitted into and installed in the mounting groove, and the first sealing lip of the first sealing strip extends from the outer ring of the support to the inner ring of the support and abuts against the outer wall of the inner ring of the support.

[0009] According to any embodiment provided in the first aspect of the present invention, the sealing assembly further includes a second sealing strip located on the second side and including a second sealing lip that overlaps with the surface of the support inner ring facing the second side.

[0010] According to any embodiment provided in the first aspect of the present invention, the mounting groove includes a first stepped groove and a second stepped groove distributed along the thickness direction. The first stepped groove is located on the side of the second stepped groove away from the pressure plate assembly, and the width of the first stepped groove is smaller than the width of the second stepped groove.

[0011] According to any embodiment provided in the first aspect of this utility model, the first sealing strip is flush with the surface of the outer ring of the support on the side where the mounting groove is provided.

[0012] According to any embodiment provided in the first aspect of this utility model, the thickness of the first sealing strip is greater than the depth of the mounting groove; in the pre-assembly state, the first sealing strip extends beyond the outer ring of the support on the first side; in the working state after assembly, the pressure plate part of the pressure plate assembly abuts against the first sealing strip on the side of the first sealing strip away from the mounting groove, and the first sealing strip is flush with the surface of the outer ring of the support on the side where the mounting groove is opened.

[0013] According to any embodiment provided in the first aspect of the present invention, the orthographic projection of the pressure plate portion on the outer ring of the support overlaps at least partially with the first sealing strip located in the first stepped groove.

[0014] According to any embodiment provided in the first aspect of the present invention, the pressure plate assembly includes a plurality of mounting portions spaced apart around the pressure plate portion, and the mounting portions are threadedly connected to the seat ring assembly.

[0015] According to any embodiment provided in the first aspect of the present invention, the mounting portion extends from the pressure plate portion toward the direction away from the inner ring of the support, and the mounting portion is symmetrically or uniformly arranged along the circumference of the outer ring of the support.

[0016] According to any embodiment provided in the first aspect of the present invention, the second sealing strip is installed on the outer ring of the support, and the second sealing lip extends from the outer ring of the support to the inner ring of the support and overlaps with the surface of the inner ring of the support facing the second side. Attached Figure Description

[0017] The features, advantages and technical effects of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of a cross-sectional structure of a slewing bearing provided in the prior art; Figure 2 This is a schematic diagram of a cross-sectional structure of another slewing bearing provided in the prior art; Figure 3 This is a schematic diagram of a partial structure of a slewing bearing provided in the first aspect embodiment of the present invention; Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure along the AA direction.

[0019] in: 100 - Slewing bearing; 100a - First side; 100b - Second side; 10-Seat ring assembly; 11-Inner support ring; 110-Mounting groove; 110a-First stepped groove; 110b-Second stepped groove; 12-Outer support ring; 20 - Rolling element; 30 - Sealing assembly; 31 - First sealing strip; Main body - 311; 310 - First sealing lip; 32 - Second sealing strip; 320 - Second sealing lip; 40 - Pressure plate assembly; 41 - Pressure plate section; 42 - Mounting section; Q - Circumferential direction; Y - Radial direction; Z - Axial direction.

[0020] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0021] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. In the accompanying drawings and the following description, at least some well-known structures and techniques have not been shown to avoid unnecessarily obscuring the utility model; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0022] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the slewing bearing of this utility model. It should also be noted in the description of this utility model that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Figure 1 The diagram shows a cross-sectional structure of a slewing bearing provided by the prior art. Figure 2 A cross-sectional structure of another slewing bearing provided in the prior art is shown.

[0024] Please see Figure 1 and Figure 2 In the field of slewing bearing sealing technology, existing solutions generally adopt single-lip or multi-lip sealing structures, but there are limitations in the design logic of the sealing structure.

[0025] In actual working conditions, the environment of the lower seal of the slewing bearing is more complex and severe than that of the upper seal. The lower seal structure is frequently exposed to pollutants such as water and mud during the operation of the engineering machinery. Under the influence of gravity, mud and water particles are easily deposited in the sealing gap and cause abrasive wear.

[0026] Existing technologies do not adequately consider the differences in special working conditions such as more frequent water immersion and siltation in the lower sealing structure, making it difficult for the sealing system to meet long-term operational requirements in terms of reliability.

[0027] Please see Figure 1 Taking a single-lip seal as an example, although the single lip structure of the lower sealing structure can achieve basic sealing function, the contact area between the lip and the metal surface is limited when faced with the intrusion of mud, sand, and water, and it lacks the ability to actively block contaminants. Mud particles and water can easily penetrate the sealing lip during mechanical vibration and reciprocating motion, directly entering the raceway and mixing with the grease. This not only reduces lubrication performance but also accelerates the peeling of the raceway surface and the wear of the rolling elements due to the abrasive action of hard particles.

[0028] Please see Figure 2 For multi-lip sealing solutions, although the sealing level is improved by increasing the number of lips, design flaws still exist. Under long-term water immersion and silt erosion conditions, the adhesive between the sealing strip and the mounting groove gradually fails due to temperature fluctuations and chemical corrosion, causing the sealing strip to fall off completely or partially.

[0029] Detached seal fragments may become stuck in the raceway, further exacerbating frictional damage. Areas that have lost their sealing function are completely exposed to the risk of external contaminant intrusion, and may even experience direct contact between the raceway surface and the rolling elements due to the missing seal, causing dry friction and irreversible damage. It is worth noting that existing reinforcement measures, such as increasing the thickness of the seal or using elastic materials, can only temporarily delay the seal failure process, but cannot resolve the contradiction between insufficient seal retention and material fatigue.

[0030] Therefore, there is an urgent need for a solution that can adapt to the special working conditions below and provide long-term stable sealing performance in order to overcome the limitations of existing technologies in structural design and material application.

[0031] In order to solve the above-mentioned technical problems and technical considerations, the first aspect of this application provides a slewing bearing that can effectively fix the second sealing strip in the sealing assembly and ensure the sealing effect even under harsh working conditions.

[0032] The following will combine Figure 3 and Figure 4 The slewing bearing provided in the first aspect embodiment of this application will be further described.

[0033] Figure 3 This illustration shows a partial structure of a slewing bearing 100 provided in a first aspect embodiment of this application. Figure 4 It shows Figure 3 The cross-sectional structure along the radial direction Y, i.e., the AA direction.

[0034] Please see Figure 3 and Figure 4 In a first aspect, embodiments of this application provide a slewing bearing 100, including a first side 100a and a second side 100b disposed opposite to each other along the thickness direction. The slewing bearing 100 also includes a seat ring assembly 10, a rolling element 20, a sealing assembly 30 and a pressure plate assembly 40. The thickness direction refers to the axial direction Z of the slewing bearing 100, that is, the direction perpendicular to the radial direction Y of AA.

[0035] The seat ring assembly 10 includes an inner support ring 11 and an outer support ring 12. The outer support ring 12 is sleeved on the inner support ring 11. The inner support ring 11 extends beyond the outer support ring 12 from a first side 100a, and the outer support ring 12 extends beyond the inner support ring 11 from a second side 100b.

[0036] The rolling element 20 is located between the outer ring 12 and the inner ring 11 of the support, and the inner ring 11 and the outer ring 12 of the support are rotatably connected by the rolling element 20.

[0037] The sealing assembly 30 is mounted on the seat ring assembly 10. The sealing assembly 30 includes a first sealing strip 31 located on the first side 100a and includes a plurality of first sealing lips 310 that abut against the outer side wall of the inner support ring 11.

[0038] The pressure plate assembly 40 is installed on the seat ring assembly 10 and located on the first side 100a. The pressure plate assembly 40 includes a pressure plate portion 41 and a mounting portion 42 extending from the pressure plate portion 41. The pressure plate portion 41 is located on the side of the first sealing strip 31 away from the seat ring assembly 10 and abuts against the first sealing strip 31. The seat ring assembly 10 and the pressure plate portion 41 are fixedly connected by the mounting portion 42 so that the first sealing strip 31 is in close contact with the seat ring assembly 10.

[0039] The slewing bearing 100 provided in the first aspect of this application solves the problem of sealing failure of the lower seal of the slewing bearing 100 under harsh working conditions such as wading and mud by adding a pressure plate assembly 40 to one side of the first sealing strip 31 and using physical contact to provide stable fixing strength.

[0040] The sealing assembly 30 adopts a first sealing strip 31 with multiple first sealing lips 310 arranged on both sides. The first sealing strip 31 is mechanically locked by the pressure plate part 41 of the pressure plate assembly 40. The pressure plate assembly 40 is fixedly connected to the seat ring assembly 10 through the mounting part 42. The pressure plate part 41 directly abuts against the side of the first sealing strip 31 away from the seat ring assembly 10 to form a rigid constraint force.

[0041] The physical contact between the pressure plate part 41 and the first sealing strip 31 enhances the fixing strength of the first sealing strip 31 under extreme conditions such as mud and water erosion and temperature fluctuations, effectively preventing the first sealing strip 31 from falling off in whole or in part.

[0042] Meanwhile, the multi-lip structure of the first sealing strip 31, which includes multiple first sealing lips 310, not only expands the sealing contact area with the outer wall of the inner ring 11 through the stepped contact of the multi-level sealing lips, but also forms multiple barriers, making it difficult for mud and sand particles and accumulated water to penetrate the sealing lips and enter the raceway area.

[0043] The slewing bearing 100 provided in the first aspect of this application can achieve long-term stable operation under harsh working conditions, extending the service life of the equipment and reducing maintenance costs.

[0044] Please continue reading. Figure 4 In some embodiments, the outer ring 12 of the support includes a mounting groove 110 formed on the first side 100a, the main body 311 of the first sealing strip is fitted into and installed in the mounting groove 110, and the first sealing lip 310 of the first sealing strip 31 extends from the outer ring 12 of the support to the inner ring 11 of the support and abuts against the outer side wall of the inner ring 11 of the support.

[0045] In these embodiments, the first sealing strip 31 uses the mounting groove 110 of the outer ring 12 as the mounting base. The first sealing lip 310 of the first sealing strip 31 extends from the outer ring 12 toward the inner ring 11 and directly abuts against the outer wall of the inner ring 11. The structural design of the first sealing strip 31 increases the contact area between the first sealing lip 310 and the inner ring 11 by extending the contact path of the first sealing lip 310, thereby improving the barrier capability of the sealing surface.

[0046] The outer support ring 12 serves as the load-bearing structure for the first sealing strip 31. It not only provides installation space but also constrains the extension direction of the first sealing lip 310 through its geometric shape, ensuring that the first sealing lip 310 maintains stable contact with the inner support ring 11 during reciprocating motion.

[0047] The stepped arrangement of multiple first sealing lips 310 forms a multi-level sealing barrier, requiring mud and sand particles and accumulated water to pass through multiple first sealing lips 310 in sequence before entering the raceway area, thus reducing the probability of pollutant intrusion.

[0048] Meanwhile, after the pressure plate assembly 40 is fixedly connected to the support outer ring 12 via the mounting part 42, the pressure plate part 41 applies continuous axial pressure in the Z direction to the first sealing strip 31. The pressure is transmitted to the root of the first sealing lip 310 through physical contact, effectively suppressing the risk of displacement or detachment of the first sealing strip 31 due to vibration or scouring by mud and water accumulation under harsh working conditions.

[0049] The inner ring 11 serves as the mating surface of the first sealing lip 310. The flatness of the outer wall and the elastic deformation capacity of the first sealing lip 310 work together to ensure that the sealing contact surface maintains dynamic sealing performance during long-term operation.

[0050] The outer ring 12 of the support includes a mounting groove 110 formed on the first side 100a, and the first sealing strip 31 includes a main body 311, which is fitted into and installed in the mounting groove 110.

[0051] The outer ring 12 of the support has an installation groove 110 on the first side 100a and fits the first sealing strip 31. The structural design of the installation groove 110 achieves precise positioning and stable installation of the sealing component 30 through the fitting and cooperation between the installation groove 110 and the first sealing strip 31.

[0052] The mounting groove 110 serves as a structural feature supporting the outer ring 12. It not only provides an embedded installation space for the first sealing strip 31, but also effectively prevents the first sealing strip 31 from shifting laterally during mechanical vibration or scouring by mud and water through the groove wall of the mounting groove 110.

[0053] After being fitted, the first sealing strip 31 forms a mechanical limit in the mounting groove 110. The multiple first sealing lips 310 extending from the first sealing strip 31 can continuously abut against the outer side wall of the inner support ring 11, avoiding the expansion of the contact surface gap due to the loosening of the first sealing strip 31.

[0054] Meanwhile, the geometry of the mounting groove 110 matches the cross-sectional shape of the main body 311 of the first sealing strip 31, so that when the first sealing strip 31 is subjected to axial pressure applied by the pressure plate assembly 40, the pressure distribution can be uniformly transmitted through the mounting groove 110, thus avoiding material fatigue fracture of the first sealing strip 31 caused by local stress concentration.

[0055] The outer ring 12 of the support, through the fitting relationship between the mounting groove 110 and the first sealing strip 31, not only enhances the overall structural strength of the sealing assembly 30, but also ensures the dynamic sealing performance of the first sealing lip 310 in reciprocating motion through the guiding effect of the mounting groove 110.

[0056] Please continue reading. Figure 4 In some embodiments, the sealing assembly 30 further includes a second sealing strip 32 located on the second side 100b and including a second sealing lip 320 that overlaps with the surface of the support inner ring 11 facing the second side 100b.

[0057] In these embodiments, a second sealing strip 32 is provided on the second side 100b where the working environment is relatively good. In addition to the grease between the inner support ring 11 and the outer support ring 12 being injected from the original oil injection hole and discharged smoothly from the second side 100b where the second sealing strip 32 is located, the second sealing lip 320 of the second sealing strip 32 can also further seal the potential contaminant intrusion path by overlapping with the surface of the inner support ring 11, which facilitates the sealing of the inner support ring 11 and the outer support ring 12.

[0058] Please continue reading. Figure 4 In some embodiments, the mounting groove 110 includes a first stepped groove 110a and a second stepped groove 110b distributed along the thickness direction, where the thickness direction refers to the axial direction Z of the slewing bearing, i.e., the direction perpendicular to the radial direction Y of AA. The first stepped groove 110a is located on the side of the second stepped groove 110b away from the pressure plate assembly 40, and the cross-sectional width of the first stepped groove 110a in the radial direction Y is smaller than the width of the second stepped groove 110b.

[0059] In these embodiments, the mounting groove 110 is composed of a first stepped groove 110a and a second stepped groove 110b distributed along the thickness direction. The first stepped groove 110a is located on the side of the second stepped groove 110b away from the pressure plate assembly 40 and has a smaller width. The stepped structure of the mounting groove 110 optimizes the installation stability and force distribution of the first sealing strip 31 through layered fitting.

[0060] The narrow groove design of the first stepped groove 110a forms a lateral limiting constraint on the root of the sealing strip, effectively suppressing the lateral displacement of the sealing strip during reciprocating motion; while the wide groove structure of the second stepped groove 110b provides a larger contact area for the pressure plate assembly 40, so that the pressure applied by the pressure plate part 41 can be evenly transmitted to the sealing strip body through the second stepped groove 110b, avoiding material fatigue fracture caused by local stress concentration.

[0061] The layered interlocking of the first stepped groove 110a and the second stepped groove 110b also enhances the mechanical interlocking force between the first sealing strip 31 and the support outer ring 12. The narrow groove of the first stepped groove 110a enhances the initial fixing strength through the deformation locking effect formed after the first sealing strip 31 is embedded. The wide groove of the second stepped groove 110b provides alignment and further strengthens the overall stability of the first sealing strip 31 through the axial pressure of the pressure plate assembly 40.

[0062] Please continue reading. Figure 4 In some embodiments, the first sealing strip 31 is flush with the surface of the outer ring 12 of the support where the mounting groove 110 is located.

[0063] In these embodiments, the first sealing strip 31 is flush with the surface of the support outer ring 12 on the side where the mounting groove 110 is formed. The coplanar relationship between the first sealing strip 31 and the surface of the mounting groove 110 optimizes the dynamic sealing performance and mechanical stability of the sealing assembly 30.

[0064] The flush setting ensures that the exposed part of the first sealing strip 31 is on the same plane as the surface of the outer ring 12 of the support, preventing the sealing strip from becoming an attachment point or impact surface for mud and sand particles in the water due to local protrusion, thereby reducing abnormal wear of the sealing lip during reciprocating motion.

[0065] The mounting groove 110 of the outer ring 12 provides fitting positioning for the sealing strip through the groove contour, while the flush design further ensures that the sealing strip is evenly distributed and has no stress concentration points when subjected to axial pressure applied by the pressure plate assembly 40, preventing fatigue crack propagation of the sealing material due to local overload.

[0066] Furthermore, the flush arrangement allows the first sealing strip 31 to form a continuous contact interface with the surface of the outer ring 12 of the support. Under mechanical vibration or impact conditions, the first sealing strip 31 can maintain a dynamic sealing effect with the outer wall of the inner ring 11 of the support by coplanarly engaging with the surface of the mounting groove 110, thus avoiding the expansion of the sealing gap caused by the displacement or tilting of the first sealing strip 31.

[0067] The flush setting also reduces the direct contact area between the first sealing strip 31 and the external environment, thereby reducing the accumulation of contaminants on the surface of the sealing strip, thus extending the cleaning cycle of the sealing assembly 30 and reducing maintenance costs.

[0068] Please continue reading. Figure 4 In some embodiments, the thickness of the first sealing strip 31 is greater than the depth of the mounting groove 110.

[0069] In the assembly state, the first sealing strip 31 is positioned on the first side 100a beyond the support outer ring 12; In the working state after assembly, the pressure plate part 41 of the pressure plate assembly 40 abuts against the first sealing strip 31 on the side away from the mounting groove 110, and the first sealing strip 31 is flush with the surface of the support outer ring 12 on the side where the mounting groove 110 is opened.

[0070] In these embodiments, the thickness of the first sealing strip 31 is greater than the depth of the mounting groove 110. In the state to be assembled, the first sealing strip 31 naturally extends beyond the surface of the support outer ring 12 due to the interference fit. After the pressure plate assembly 40 is installed, the pressure plate part 41 applies axial pressure to the first sealing strip 31 from the side away from the mounting groove 110, so that the first sealing strip 31 is compressed and eventually flush with the surface of the support outer ring 12.

[0071] Through the synergistic effect of the thickness difference and the pressure plate 41, the first sealing strip 31 forms a continuous pre-tightening force in the working state; the interference thickness of the first sealing strip 31 ensures that the pressure plate 41 produces uniform compression deformation when pressure is applied, so that the sealing lip and the outer side wall of the inner ring 11 of the support remain dynamically fitted, avoiding the expansion of the contact surface gap due to vibration or impact.

[0072] The fitting structure of the mounting groove 110 constrains the lateral displacement of the first sealing strip 31 by contour constraint, while the axial Z pressure of the pressure plate part 41 is converted into a radial Y support force on the first sealing lip 310 by the compression deformation of the first sealing strip 31, thereby enhancing the penetration resistance of the first sealing strip 31 in reciprocating motion.

[0073] The outer ring 12 of the support forms a double constraint with the rigid fixation of the pressure plate assembly 40 through the limiting effect of the mounting groove 110. This ensures that the first sealing strip 31 can maintain stable sealing contact with the inner ring 11 of the support under harsh working conditions such as water wading and mud and sand. At the same time, the interference fit and clamping force can prevent the first sealing strip 31 from falling off due to material fatigue or external force.

[0074] Please continue reading. Figure 3 and Figure 4 In some embodiments, the orthographic projection of the pressure plate portion 41 onto the outer ring 12 of the support overlaps at least partially with the first sealing strip 31 located within the first stepped groove 110a.

[0075] In these embodiments, the orthographic projection of the pressure plate portion 41 onto the outer ring 12 of the support overlaps at least partially with a portion of the first sealing strip 31 of the first stepped groove 110a, thereby optimizing the force distribution and fixation stability of the first sealing strip 31 through the overlapping relationship of the projection areas.

[0076] The coverage area of ​​the pressure plate part 41 extends to the area of ​​the first stepped groove 110a, so that the axial pressure applied by it can directly act on the key limiting part of the first sealing strip 31. Through the cooperative constraint of the first stepped groove 110a with narrow groove structure and the pressure plate part 41, the lateral displacement of the first sealing strip 31 in reciprocating motion is effectively suppressed.

[0077] The first stepped groove 110a in the narrow groove section undergoes local deformation and locking due to the pressure of the pressure plate 41, resulting in a tighter mechanical engagement between the first sealing strip 31 and the groove wall of the mounting groove 110; while the second stepped groove 110b in the wide groove structure provides a larger contact area for the pressure plate 41, ensuring that the pressure is evenly transmitted to the entire body of the first sealing strip 31.

[0078] By layering and fitting the pressure plate part 41 with the first stepped groove 110a and the second stepped groove 110b, when the first sealing strip 31 is subjected to external impact or vibration, the part of the first sealing strip 31 that is fitted with the first stepped groove 110a remains stable due to the direct pressure of the pressure plate part 41, thus avoiding the expansion of the gap between the sealing lip contact surfaces caused by the overall loosening of the first sealing strip 31.

[0079] Please see Figure 3 In some embodiments, the pressure plate assembly 40 includes a plurality of mounting portions 42 spaced around the pressure plate portion 41, and the mounting portions 42 are threadedly connected to the seat ring assembly 10.

[0080] In these embodiments, the pressure plate assembly 40 is threadedly connected to the seat ring assembly 10 through a plurality of mounting portions 42 spaced around the pressure plate portion 41. The multi-point distributed mounting structure optimizes the uniformity of force distribution and the stability of fixation of the pressure plate assembly 40.

[0081] Multiple mounting parts 42 are arranged circumferentially along the pressure plate part 41, so that when the pressure plate assembly 40 applies axial pressure, each mounting part 42 transmits the pressure evenly to the outer ring 12 of the support through threaded connection, avoiding local stress concentration or unbalanced deformation of the sealing strip caused by uneven force at a single point.

[0082] The threaded connection enhances the fixing strength between the mounting part 42 and the seat ring assembly 10 through mechanical interlocking, so that the pressure plate assembly 40 can maintain a stable clamping force under mechanical vibration or impact conditions, and prevents sealing failure due to loose connection.

[0083] The surrounding distribution of the mounting portion 42 also forms support for the pressure plate portion 41 in the axial direction Z and circumferential direction Q, so that the pressure plate portion 41 can maintain geometric stability when subjected to the reverse force of the sealing strip, and avoid the pressure plate portion 41 tilting or deforming due to eccentric loading, thereby ensuring a tight fit between the first sealing strip 31 and the mounting groove 110 of the support outer ring 12.

[0084] Please continue reading. Figure 3 In some embodiments, the mounting portion 42 extends from the pressure plate portion 41 in a direction away from the inner ring 11 of the support, and the mounting portion 42 is symmetrically or uniformly arranged along the circumferential direction Q of the outer ring 12 of the support. The mounting portion 42 extends symmetrically along the circumferential direction Q of the pressure plate portion 41, so that the connection points of each mounting portion 42 and the seat ring assembly 10 form a symmetrical force distribution in space, avoiding connection failure or unbalanced deformation of the sealing strip due to local stress concentration.

[0085] The symmetrical extension of the mounting portion 42 also enhances the overall structural rigidity of the pressure plate assembly 40, maintaining geometric stability under mechanical vibration or impact conditions, preventing the pressure plate portion 41 from deflecting or tilting, thereby ensuring a tight fit between the first sealing strip 31 and the mounting groove 110.

[0086] In some optional embodiments, the mounting portions 42 are evenly distributed along the circumferential direction Q of the pressure plate portion 41, that is, the distance between any two adjacent mounting portions 42 is equal. The evenly distributed mounting portions 42 optimize the force balance and installation stability of the pressure plate assembly 40.

[0087] The uniform distribution of the mounting portions 42 ensures that when the pressure plate assembly 40 applies pressure in the axial direction Z and the circumferential direction Q, the pressure can be synchronously transmitted to the outer ring 12 through each mounting portion 42, thereby maintaining the uniform pressing force of the pressure plate portion 41 on the first sealing strip 31 and preventing the expansion of the gap between the contact surfaces of the first sealing lip 310 caused by uneven force.

[0088] Please see Figure 4 In some embodiments, the second sealing strip 32 is mounted on the outer ring 12 of the support, and the second sealing lip 320 extends from the outer ring 12 to the inner ring 11 of the support and overlaps with the surface of the inner ring 11 facing the second side 100b.

[0089] In these embodiments, the second sealing strip 32 is mounted on the outer ring 12 of the support, and the second sealing lip 320 extends from the outer ring 12 of the support towards the inner ring 11 of the support and forms an overlapping contact with the surface of the inner ring 11 of the support facing the second side 100b. The extended overlapping structure enhances the contaminant barrier capability of the sealing area of ​​the second side 100b.

[0090] The fitting and overlapping of the second sealing strip 32 with the outer ring 12 of the support, combined with the extension of the sealing lip, allows the sealing assembly 30 to form a sealing barrier on the second side 100b that is independent of the first side 100a, further sealing off potential contaminant intrusion paths.

[0091] While achieving a better sealing effect on the first side 100a under more severe working conditions, the second sealing strip 32 also retains the function of smoothly discharging the grease between the inner support ring 11 and the outer support ring 12, ensuring that the grease can be discharged smoothly.

[0092] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A slewing bearing, comprising a first side and a second side disposed opposite to each other along the thickness direction, characterized in that, The slewing bearing further includes: A seat ring assembly, the seat ring assembly including a support inner ring and a support outer ring, the support outer ring being sleeved on the support inner ring, the support inner ring extending beyond the support outer ring from a first side and the support outer ring extending beyond the support inner ring from a second side; A rolling element is located between the outer ring of the support and the inner ring of the support, and the inner ring of the support and the outer ring of the support are rotatably connected by the rolling element; A sealing assembly, mounted on the seat ring assembly, the sealing assembly including a first sealing strip located on the first side and including a plurality of first sealing lips abutting against the outer side wall of the inner support ring; A pressure plate assembly is installed on the seat ring assembly and located on the first side. The pressure plate assembly includes a pressure plate portion and a mounting portion extending from the pressure plate portion. The pressure plate portion is located on the side of the first sealing strip away from the seat ring assembly and abuts against the first sealing strip. The seat ring assembly and the pressure plate portion are fixedly connected by the mounting portion so that the first sealing strip is in close contact with the seat ring assembly.

2. The slewing bearing according to claim 1, characterized in that, The outer ring of the support includes a mounting groove formed on the first side. The main body of the first sealing strip is fitted into and installed in the mounting groove. The first sealing lip of the first sealing strip extends from the outer ring of the support to the inner ring of the support and abuts against the outer side wall of the inner ring of the support.

3. The slewing bearing according to claim 2, characterized in that, The sealing assembly further includes a second sealing strip located on the second side and including a second sealing lip that overlaps with the surface of the support inner ring facing the second side.

4. The slewing bearing according to any one of claims 2 to 3, characterized in that, The mounting groove includes a first stepped groove and a second stepped groove distributed along the thickness direction. The first stepped groove is located on the side of the second stepped groove away from the pressure plate assembly, and the width of the first stepped groove is smaller than the width of the second stepped groove.

5. The slewing bearing according to claim 4, characterized in that, The first sealing strip is flush with the surface of the outer ring of the support where the mounting groove is located.

6. The slewing bearing according to claim 5, characterized in that, The thickness of the first sealing strip is greater than the depth of the mounting groove; In the assembly state, the first sealing strip extends beyond the outer ring of the support on the first side; In the working state after assembly, the pressure plate part of the pressure plate assembly abuts against the first sealing strip on the side of the first sealing strip away from the mounting groove, and the first sealing strip is flush with the surface of the support outer ring on the side where the mounting groove is opened.

7. The slewing bearing according to claim 6, characterized in that, The orthographic projection of the pressure plate portion onto the outer ring of the support overlaps at least partially with the first sealing strip located within the first stepped groove.

8. The slewing bearing according to claim 1, characterized in that, The pressure plate assembly includes a plurality of mounting portions spaced apart around the pressure plate portion, and the mounting portions are threadedly connected to the seat ring assembly.

9. The slewing bearing according to claim 8, characterized in that, The mounting portion extends from the pressure plate portion in a direction away from the inner ring of the support, and the mounting portion is symmetrically or uniformly arranged along the circumference of the outer ring of the support.

10. The slewing bearing according to claim 3, characterized in that, The second sealing strip is installed on the outer ring of the support, and the second sealing lip extends from the outer ring of the support to the inner ring of the support and overlaps with the surface of the inner ring of the support facing the second side.

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