Rolling bearing and hoist assembly

Abstract

The rolling bearing and the traction machine assembly of the present application, the rolling bearing comprises an inner ring, an outer ring arranged opposite to the inner ring, a rolling body arranged between the inner ring and the outer ring, and the inner ring can rotate relative to the outer ring through the rolling body; wherein, the side of the inner ring facing the outer ring is configured with an inner raceway, an oil return groove and an oil retaining ring groove, the inner raceway is arranged in abutment with the rolling body; the oil return groove is arranged at the outer side edge of the inner raceway, the oil return groove can accommodate the lubricating grease from the inner raceway, and the accommodated lubricating grease can be returned to the inner raceway based on the pumping pressure generated by the rotation of the oil return groove with the inner ring; the oil retaining ring groove is arranged on the side of the oil return groove away from the inner raceway, and is used for blocking the lubricating grease from flowing out of the oil return groove. The rolling bearing uses the oil retaining ring groove to limit the loss of lubricating grease while returning the lubricating grease to the inner raceway with the oil return groove, which can improve the loss of lubricating grease in the inner raceway of the inner ring in the rolling bearing due to long-term operation, thereby ensuring the continuous lubricating effect on the rolling body.

Description

Technical Field

[0001] This utility model belongs to the field of bearing-related technology, and in particular relates to a rolling bearing and a traction machine assembly. Background Technology

[0002] Rolling bearings are precision mechanical components. By placing rolling elements between inner and outer rings, the inner ring can rotate relative to the outer ring, thus supporting the shaft and ensuring its rotational accuracy. During operation, a lubricating film formed by lubricating oil or grease separates the rolling elements from the raceways, achieving low friction and a long service life. Sealed bearings typically require only one grease filling during their designed lifespan. Proper lubrication is crucial for ensuring the bearing's lifespan and reliability. During prolonged operation, oil separation and loss from the grease can lead to insufficient oil in the contact areas, affecting the bearing's lifespan.

[0003] In actual operation, the temperature of the contact area between the rolling elements and the raceway of a bearing is lower than the temperature of the outer part of the inner ring raceway. This creates a temperature difference between the inner and outer ring areas of the raceway in a rolling bearing. This temperature difference causes the temperature gradient formed by the high temperature in the contact area to the low temperature in the non-contact area, which leads to the temperature migration of the grease. This in turn induces the initially filled grease to creep outward from the raceway where the rolling elements are located, resulting in insufficient lubrication replenishment in the core contact area of ​​the raceway. Consequently, this leads to deterioration of the lubrication condition, increased frictional heat generation, and accumulated damage to parts, thereby reducing the service life of the rolling bearing.

[0004] Currently, existing technologies for addressing the lubrication and sealing problems of rolling bearings mostly focus on improving the sealing structure or cage structure. For example, patent document CN116123211A, which discloses a "high-speed rolling bearing with an adaptive sealing and enhanced cooling structure," reduces wear on the sealing surface and enhances the sealing effect by forming a flow-collecting ring groove with the sealing cap along the radial direction on the inner side of the inner ring. Meanwhile, patent document CN112283240B, which discloses a "double-half-inner-ring angular contact ball bearing with a spiral groove on the outer surface of the cage," uses a spiral groove on the outer surface of the cage to pump fluid into the contact surface based on the microstructure of the spiral groove, thus avoiding contact damage caused by insufficient lubrication supply in the contact area. However, none of the above improvements address a fundamental problem: to ensure heat dissipation and stable operation, a gap inevitably exists between the sealing structure and the rolling element contact area of ​​the rolling bearing. The oil separation and creep phenomena that occur in this gap directly lead to oil loss in the core contact area, which cannot be replenished. Clearly, the above solutions cannot effectively solve this structural contradiction. Utility Model Content

[0005] In view of this, it is necessary to provide a rolling bearing and traction machine assembly that can prevent the loss of lubricating grease.

[0006] A rolling bearing includes an inner ring, an outer ring disposed opposite the inner ring, and a rolling element disposed between the inner ring and the outer ring. The inner ring is capable of rotating relative to the outer ring via the rolling element. The inner ring has the following configuration on its side facing the outer ring: The inner raceway is configured to abut against the rolling element; An oil return groove is provided on the outer edge of the inner raceway. The oil return groove is used to collect lubricating grease from the inner raceway and can return the collected lubricating grease to the inner raceway based on the pumping pressure generated by the oil return groove as the inner ring rotates. An oil-blocking ring groove is provided on the side of the oil return groove opposite to the inner raceway, and is used to prevent the lubricating grease from flowing out of the oil return groove.

[0007] Understandably, by using an oil retaining ring groove to limit the loss of lubricating grease, the oil return groove can be used to return the lubricating grease to the inner raceway. This can improve the problem of lubricating grease loss in the inner raceway of the inner ring of the rolling bearing due to long-term operation, thereby ensuring continuous lubrication of the rolling elements and ultimately extending the service life of the rolling bearing.

[0008] In one embodiment, the number of oil return grooves is configured to be multiple; Along the circumferential direction of the inner ring, a plurality of oil return grooves are arranged sequentially at intervals.

[0009] Understandably, by arranging multiple oil return grooves at circumferential intervals, multiple independent oil return channels can be formed when the rolling bearing is running, realizing the distributed collection and guidance of the outward crawling lubricating grease. This can increase the range of oil return and improve the overall oil return efficiency, thereby further alleviating the loss of lubricating grease inside the rolling bearing.

[0010] In one embodiment, the inner ring is provided with the oil return grooves on both outer edges of the inner raceway; Each of the oil return grooves is obliquely arranged in the direction of rotation of the inner ring, extending from the inner raceway to the oil baffle ring groove.

[0011] In one embodiment, the oil return groove extends from the inner raceway toward the oil baffle ring groove; The profile of the oil return groove can be any one of a spiral, a straight line, an oblique line, or a circular arc.

[0012] In one embodiment, the depth of the oil return groove gradually decreases or remains constant from the inner raceway toward the oil baffle ring groove.

[0013] In one embodiment, the depth of the oil return groove is set to D1, and satisfies 50μm≥D1≥2μm.

[0014] In one embodiment, a flow-blocking surface is also constructed on the side of the inner ring facing the outer ring. The flow-blocking surface is connected to the inner peripheral wall of the oil-blocking ring groove and forms an angle P with the inner peripheral wall, satisfying 70°<P≤110°. The flow-blocking surface can retain the lubricating grease, thereby limiting the flow of the lubricating grease into the oil-blocking ring groove.

[0015] It is understandable that the flow-blocking surface can effectively retain lubricating grease that attempts to spread outward by utilizing the surface tension effect of the lubricating grease. This enhances the blocking effect on the lubricating grease, thereby physically improving the overall oil-blocking effect and further inhibiting the loss of lubricating grease inside the rolling bearing.

[0016] In one embodiment, the junction between the inner peripheral wall and the flow-blocking surface is constructed with a sharp edge structure.

[0017] In one embodiment, the depth of the oil baffle ring groove is set to D2, and satisfies 1.5mm≥D2≥0.05mm; The width of the oil baffle ring groove is set to W, and it satisfies 2mm≥W≥0.2mm.

[0018] In one embodiment, the rolling bearing further includes a first sealing cover and a second sealing cover, the first sealing cover and the second sealing cover being disposed between the inner ring and the outer ring, and respectively cooperating with the inner ring and the outer ring to seal; Along the axial direction of the inner ring, both the oil return groove and the oil baffle ring groove are housed between the first sealing cover and the second sealing cover that mates with the outer ring.

[0019] Understandably, by utilizing the fit between the first and second sealing caps and the inner and outer rings, an external sealing barrier is formed for the rolling bearing, thereby effectively preventing the final leakage of lubricating grease.

[0020] In one embodiment, the return oil groove and the oil baffle ring groove are combined to form a flow limiting component; The number of flow limiting components is configured as two sets, and the two sets of flow limiting components are arranged on both sides of the inner raceway in the axial direction of the inner ring.

[0021] Understandably, by arranging two sets of flow-limiting components on both sides of the inner raceway, the loss of lubricating grease can be effectively limited, thereby ensuring continuous lubrication of the rolling elements and ultimately extending the service life of the rolling bearing.

[0022] This application also provides a traction machine assembly, including a traction machine and the rolling bearing described above; The inner ring is fitted onto the traction shaft of the traction machine and connected to the traction shaft.

[0023] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The rolling bearing and traction machine assembly claimed in this application, by employing an oil retaining ring groove to limit the loss of lubricating grease, can use an oil return groove to return the lubricating grease to the inner raceway. This improves the problem of lubricating grease loss in the inner raceway of the inner ring of the rolling bearing due to long-term operation during long-term use, thereby ensuring continuous lubrication of the rolling elements and ultimately extending the service life of the rolling bearing. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 An exploded view of the rolling bearing provided in this application.

[0026] Figure 2 for Figure 1 Sectional view of AA.

[0027] Figure 3 This is a sectional view of the inner circle in this application.

[0028] Figure 4 This is a partial structural diagram of the inner ring in this application.

[0029] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0030] Reference numerals: 100, rolling bearing; 10, inner ring; 11, inner raceway; 12, 13, flow limiting component; 12, oil return groove; 13, oil baffle ring groove; 13, inner peripheral wall; 14, flow blocking surface; 20, outer ring; 30, rolling element; 40, first sealing cover; 50, second sealing cover. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that when a component is said to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or may have an intervening component.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] like Figures 1 to 5 As shown, the rolling bearing 100 provided in this application includes an inner ring 10, an outer ring 20 disposed opposite to the inner ring 10, and a rolling element 30 disposed between the inner ring 10 and the outer ring 20. The inner ring 10 can rotate relative to the outer ring 20 through the rolling element 30. The inner ring 10 has an inner raceway 11, an oil return groove 12, and an oil retaining ring groove 13 on the side facing the outer ring 20. The inner raceway 11 is disposed in contact with the rolling element 30. The oil return groove 12 is disposed on the outer edge of the inner raceway 11. The oil return groove 12 is used to collect lubricating grease from the inner raceway 11 and can return the collected lubricating grease to the inner raceway 11 based on the pumping pressure generated by the rotation of the inner ring 10. The oil retaining ring groove 13 is disposed on the side of the oil return groove 12 away from the inner raceway 11 and is used to prevent lubricating grease from flowing out of the oil return groove 12. In other words, the rolling bearing of this application uses the oil retaining ring groove 13 to limit the loss of lubricating grease, while the oil return groove 12 can return the lubricating grease to the inner raceway 11. This improves the lubricating grease loss in the inner raceway 11 of the inner ring 10 of the rolling bearing 100 due to long-term operation during long-term use, thereby ensuring the continuous lubrication effect on the rolling elements 30 and ultimately extending the service life of the rolling bearing 100.

[0035] It should be noted that when the rolling bearing 100 is running, a small amount of lubricating grease that crawls outward from the inner raceway 11 will first enter the oil return groove 12. Due to the flow restriction and obstruction of the oil baffle ring groove 13 on the outer side of the oil return groove 12, this lubricating grease will be thrown away from the oil return groove 12 and guided back to the inner raceway 11 under the centrifugal force of the inner ring 10 rotating, thereby effectively improving the problem of lubricating grease loss.

[0036] like Figure 3 As shown, in one embodiment, the number of oil return grooves 12 is configured to be multiple; and, along the circumferential direction of the inner ring 10, the multiple oil return grooves 12 are arranged sequentially at intervals. This allows the rolling bearing 100 to form multiple independent oil return channels when the rolling bearing 100 is in operation using the multiple circumferentially spaced oil return grooves 12, realizing the distributed collection and guidance of lubricating grease crawling outward from the inner raceway 11. This increases the oil return range and improves the overall oil return efficiency, thereby further alleviating the loss of lubricating grease inside the rolling bearing 100.

[0037] Here, multiple oil return grooves 12 are arranged at equal intervals along the circumferential direction of the inner ring 10. The spacing between two adjacent oil return grooves 12 in the circumferential direction of the inner ring 10 can be specifically set according to the usage requirements, which will not be elaborated here.

[0038] like Figure 3 As shown, the inner ring 10 has oil return grooves 12 arranged on both outer edges of the inner raceway 11; each oil return groove 12 is obliquely arranged in the direction of rotation of the inner ring 10, extending from the inner raceway 11 towards the oil retaining ring groove 13. This gives the oil return grooves 12 on the inner ring 10 a clear aspect ratio and directionality, which is beneficial for returning the collected lubricating grease to the inner raceway 11. In one embodiment, the oil return grooves 12 on both sides of the inner raceway 11 are in the direction of rotation of the inner ring 10, but the inclination directions of the oil return grooves 12 on both sides are opposite, and they are symmetrically arranged.

[0039] like Figure 3 , Figure 4 As shown, the oil return groove 12 extends from the inner raceway 11 toward the oil retaining ring groove 13; and the profile of the oil return groove 12 is any one of a spiral, a straight line, an oblique line or an arc, that is, the shape of the oil return groove 12 can be spiral, straight, inclined or arc, so as to facilitate the return of lubricating grease in the oil return groove 12 to the inner raceway 11.

[0040] Here, the profiles of the multiple oil return grooves 12 on the inner ring 10 are kept consistent to facilitate the processing and manufacturing of the inner ring 10. Of course, in other embodiments, the profiles of the multiple oil return grooves 12 on the inner ring 10 may not be consistent, and the spiral line, straight line, oblique line or arc line mentioned above can be selected according to the usage requirements.

[0041] It should be noted that the profile of the aforementioned oil return groove 12 is specifically the center line of the oil return groove 12 extending along its extension direction.

[0042] In this process, the depth of the oil return groove 12 gradually decreases or remains constant from the inner raceway 11 toward the oil baffle ring groove 13. Preferably, the depth of the oil return groove 12 gradually decreases from the inner raceway 11 toward the oil baffle ring groove 13, so that the oil return groove 12 forms a gradually changing oil return channel from deep to shallow. This can reduce the flow resistance encountered by the lubricating grease when it is returned to the inner raceway 11, thereby promoting the return of the lubricating grease in the oil return groove 12.

[0043] Here, the depth of the oil return groove 12 is set to D1, and satisfies 50μm≥D1≥2μm. Therefore, when the depth of the oil return groove 12 is set to gradually decrease from the inner raceway 11 toward the oil baffle ring groove 13, the oil return groove 12 can vary from 2μm to 50μm; when the depth of the oil return groove 12 is set to remain unchanged from the inner raceway 11 toward the oil baffle ring groove 13, the depth of the oil return groove 12 can be specifically set to 2μm, 50μm, or any value between 2μm and 50μm, which will not be elaborated here.

[0044] like Figure 4 , Figure 5 As shown, in one embodiment, a flow-blocking surface 14 is also constructed on the side of the inner ring 10 facing the outer ring 20. The flow-blocking surface 14 is connected to the inner peripheral wall 131 of the oil-blocking ring groove 13 and forms an angle P with the inner peripheral wall 131, satisfying 70°<P≤110°. Furthermore, the flow-blocking surface 14 can retain lubricating grease to limit the flow of lubricating grease into the oil-blocking ring groove 13. This allows the flow-blocking surface 14 to utilize the surface tension effect of the lubricating grease to retain the lubricating grease attempting to crawl outward onto the flow-blocking surface 14. This enhances the blocking effect on the lubricating grease, thereby physically improving the overall oil-blocking effect and further suppressing the loss of lubricating grease inside the rolling bearing 100.

[0045] Here, the flow-blocking surface 14 is perpendicular to the inner peripheral wall 131 of the oil-blocking ring groove 13. Of course, in other embodiments, the included angle P formed between the flow-blocking surface 14 and the inner peripheral wall 131 of the oil-blocking ring groove 13 can also be set to 71°, 89°, 88°, 85°, 90°, 98°, 110°, etc., which can be designed according to the needs of use, and will not be elaborated here.

[0046] The inner peripheral wall 131 of the oil-blocking ring groove 13 has a sharp edge structure at the junction with the flow-blocking surface 14. This allows the oil-blocking ring groove 13 to prevent the oil precipitated in the lubricating grease from creeping due to the edge effect. When the rolling bearing 100 rotates, the centrifugal force causes the oil precipitated to move outward towards the inner raceway 11. The sharp edge structure of the oil-blocking ring groove 13 prevents the oil precipitated from moving outward continuously through the edge effect. At the same time, the oil return groove 12 generates pumping pressure as the inner ring 10 rotates, which pushes the oil precipitated collected in the oil-blocking ring groove 13 back into the inner raceway 11 along the oil return groove 12, forming a dynamic circulation oil replenishment.

[0047] Here, the aforementioned sharp edge structure is a sharp structure with folded corners, not a transitional edge with rounded corners.

[0048] The depth of the oil baffle groove 13 is set to D2, and satisfies 1.5mm≥D2≥0.05mm; the width of the oil baffle groove 13 is set to W, and satisfies 2mm≥W≥0.2mm. This ensures that when the rolling bearing 100 is in operation, the inner ring 10 can also use the oil baffle groove 13 to collect the lubricating grease overflowing from the flow baffle surface 14, ensuring that the lubricating grease will not leak out.

[0049] like Figure 3 As shown, in one embodiment, the oil return groove 12 and the oil retaining ring groove 13 are combined to form a flow limiting component 1213; the number of flow limiting components 1213 in the rolling bearing 100 is configured as two sets, and the two sets of flow limiting components 1213 are arranged on both sides of the inner raceway 11 in the axial direction of the inner ring 10. This can effectively limit the loss of lubricating grease, thereby ensuring continuous lubrication of the rolling elements 30, and ultimately achieving the purpose of extending the service life of the rolling bearing 100.

[0050] like Figure 2 As shown, in one embodiment, the rolling bearing 100 further includes a first sealing cover 40 and a second sealing cover 50. The first sealing cover 40 and the second sealing cover 50 are disposed between the inner ring 10 and the outer ring 20, and respectively cooperate with the inner ring 10 and the outer ring 20 for sealing. Furthermore, along the axial direction of the inner ring 10, the oil return groove 12 and the oil retaining ring groove 13 are both received between the first sealing cover 40 and the second sealing cover 50. That is to say, the rolling bearing 100 in this embodiment can be sealed by the cooperation between the first sealing cover 40 and the second sealing cover 50 and the inner and outer rings, forming an external sealing barrier for the rolling bearing 100, thereby effectively preventing the final leakage of lubricating grease.

[0051] It should be noted that the specific structure of the first sealing cover 40 and the second sealing cover 50, as well as the specific assembly method between the inner ring 10 and the outer ring 20, can adopt conventional methods of existing technology, and will not be elaborated here.

[0052] In addition, this application also provides a traction machine assembly, including a traction machine (not shown) and the rolling bearing 100 shown above; the inner ring 10 is fitted onto the traction shaft (not shown) of the traction machine and connected to the traction shaft, so that when the rolling bearing 100 is running at low speed in the traction machine, the oil return groove 12 of the rolling bearing 100 can improve the fluidity of the lubricating grease in the rolling bearing 100 and return the lubricating grease to the inner raceway 11, thereby extending the service life of the rolling bearing 100 and improving the lubrication performance of heavy-duty equipment such as traction machines.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A rolling bearing, comprising an inner ring (10), an outer ring (20) disposed opposite the inner ring (10), and a rolling element (30) disposed between the inner ring (10) and the outer ring (20), wherein the inner ring (10) is capable of rotating relative to the outer ring (20) via the rolling element (30); characterized in that, The inner ring (10) has the following structure on the side facing the outer ring (20): The inner raceway (11) is provided to abut against the rolling element (30); The oil return groove (12) is located on the outer edge of the inner raceway (11). The oil return groove (12) is used to collect the lubricating grease from the inner raceway (11) and can return the collected lubricating grease to the inner raceway (11) based on the pumping pressure generated by the oil return groove (12) rotating with the inner ring (10). An oil-blocking ring groove (13) is provided on the side of the oil return groove (12) away from the inner raceway (11) to prevent the lubricating grease from flowing out of the oil return groove (12).

2. The rolling bearing according to claim 1, characterized in that, The number of oil return tanks (12) is configured to be multiple; Along the circumferential direction of the inner ring (10), a plurality of oil return grooves (12) are arranged sequentially at intervals.

3. The rolling bearing according to claim 2, characterized in that, The inner ring (10) has oil return grooves (12) arranged on both outer edges of the inner raceway (11); Each of the oil return grooves (12) is obliquely arranged in the direction of rotation of the inner ring (10) extending from the inner raceway (11) to the oil baffle ring groove (13).

4. The rolling bearing according to claim 1, characterized in that, The oil return groove (12) extends from the inner raceway (11) toward the oil baffle ring groove (13); The profile of the oil return groove (12) can be any one of a spiral, a straight line, an oblique line or a circular arc.

5. The rolling bearing according to claim 1, characterized in that, The depth of the return groove (12) gradually decreases or remains constant from the direction of the inner raceway (11) toward the oil retaining ring groove (13).

6. The rolling bearing according to claim 5, characterized in that, The depth of the return oil groove (12) is set to D1, and satisfies 50μm≥D1≥2μm.

7. The rolling bearing according to claim 1, characterized in that, The inner ring (10) is also provided with a flow-blocking surface (14) on the side facing the outer ring (20). The flow-blocking surface (14) is connected to the inner peripheral wall (131) of the oil-blocking ring groove (13) and forms an angle P with the inner peripheral wall (131), satisfying 70°<P≤110°. The flow-blocking surface (14) can retain the lubricating grease to limit the flow of the lubricating grease into the oil-blocking ring groove (13).

8. The rolling bearing according to claim 7, characterized in that, The junction between the inner peripheral wall (131) and the flow-blocking surface (14) is constructed with a sharp edge structure.

9. The rolling bearing according to claim 1, characterized in that, The depth of the oil baffle groove (13) is set to D2, and satisfies 1.5mm≥D2≥0.05mm; The width of the oil baffle groove (13) is set to W, and satisfies 2mm≥W≥0.2mm.

10. The rolling bearing according to claim 1, characterized in that, The rolling bearing (100) further includes a first sealing cover (40) and a second sealing cover (50), the first sealing cover (40) and the second sealing cover (50) being disposed between the inner ring (10) and the outer ring (20), and respectively cooperating with the inner ring (10) and the outer ring (20) to seal; Along the axial direction of the inner ring (10), the oil return groove (12) and the oil retaining ring groove (13) are both housed between the first sealing cover (40) and the second sealing cover (50).

11. The rolling bearing according to claim 1, characterized in that, The oil return groove (12) and the oil baffle ring groove (13) are combined to form a flow limiting component (1213). The number of flow limiting components (1213) is configured as two sets, and the two sets of flow limiting components (1213) are disposed on both sides of the inner raceway (11) in the axial direction of the inner ring (10).

12. A traction machine assembly, characterized in that, Includes a traction machine and a rolling bearing (100) as described in any one of claims 1 to 11. The inner ring (10) is fitted onto the traction shaft of the traction machine and connected to the traction shaft.

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