Three-row roller slewing bearing for mobile crane

Abstract

The utility model discloses a slewing bearing with three rows of rollers for a mobile crane. The slewing bearing comprises an inner ring, an outer ring, a first roller, a second roller, a third roller, a first isolation frame and a second isolation frame, according to the utility model, the pin rollers arranged in the accommodating cavities can form corresponding pin roller rows, and the arrangement of the plurality of pin roller rows can effectively ensure the loading capacity of the utility model, so that the utility model can effectively adapt to the use of a mobile crane. Meanwhile, due to the fact that the sizes of the pin rollers in all the pin roller rows are different, the situation of stress concentration can be reduced in the using process, local overload is avoided, and the fatigue life is prolonged. And due to the formation of the accommodating cavities, the arrangement of the rollers can be facilitated, and the arrangement reliability of the rollers is improved.

Description

Technical Field

[0001] This utility model relates to the field of engineering equipment technology, and in particular to a three-row roller slewing bearing for a mobile crane. Background Technology

[0002] A mobile crane is a lifting device that can be flexibly moved indoors and outdoors, and is typically used for lifting, transporting, and hoisting operations. Mobile cranes often include a slewing bearing to facilitate rotation and other movements during operation.

[0003] Ball bearings are commonly used in the slewing bearings of mobile cranes. However, ball bearings have limited load-bearing capacity and are not suitable for heavy-load applications. To adapt to the use of mobile cranes that require heavy loads and to improve the load-bearing capacity of the slewing bearings, some mobile cranes now use roller bearings for their slewing bearings.

[0004] Conventional roller slewing bearings typically feature only a single row of rollers, resulting in limited load-bearing capacity and a significant risk of failure when mobile cranes operate under heavy loads. To avoid this, many modern mobile cranes utilize slewing bearings with multiple rows of rollers of the same size. However, in practical use, it has been found that this type of slewing bearing, due to the uniform size of the roller rows, is prone to stress concentration. This is especially problematic for large mobile cranes under heavy loads or impact loads, leading to localized overloads and a shorter fatigue life. Utility Model Content

[0005] The purpose of this invention is to provide a three-row roller slewing bearing for mobile cranes, which can solve one or more of the above-mentioned problems.

[0006] According to one aspect of this utility model, a three-row roller slewing bearing for a mobile crane is provided, comprising an inner ring, an outer ring, a first roller, a second roller, a third roller, a first spacer, and a second spacer, wherein there are multiple first rollers, second rollers, and third rollers.

[0007] The inner ring is provided with a first side groove, and a second side groove is provided on the side wall of the first side groove.

[0008] The outer ring has a central hole, and a boss is provided on the side wall of the central hole. The inner ring is disposed on the central hole, and the boss extends into the first side groove. The boss separates a first receiving cavity and a second receiving cavity on the first side groove, and forms a third receiving cavity with the second side groove.

[0009] Both the first and second isolation frames are fitted onto the inner ring. The first isolation frame is disposed within the first accommodating cavity, and the second isolation frame is embedded within the second accommodating cavity.

[0010] The first roller is mounted on the first spacer and abuts against the inner and outer rings respectively. The second roller is mounted on the second spacer and abuts against the inner and outer rings respectively. The third roller is embedded in the third receiving cavity and abuts against the boss and the inner ring respectively.

[0011] The dimensions of the first roller, the second roller, and the third roller decrease sequentially.

[0012] The beneficial effects of this invention are as follows: In this invention, the rollers disposed within each accommodating cavity can form corresponding roller rows. The arrangement of multiple roller rows effectively ensures the load-bearing capacity of this invention, thus effectively adapting it to the use of mobile cranes. Simultaneously, because the rollers in each roller row have different dimensions, stress concentration is reduced during the use of this invention, thereby avoiding localized overload and improving fatigue life. Furthermore, the formation of each accommodating cavity facilitates the placement of each roller, improving the reliability of the roller placement.

[0013] In some embodiments, an upper gap and a lower gap are formed at the upper and lower ends of the third roller between the boss and the sidewall of the first side groove. The third receiving cavity is connected to the bottom end of the first receiving cavity through the upper gap, and the third receiving cavity is connected to the top end of the second receiving cavity through the lower gap. The upper and lower gaps prevent direct contact between the boss and the first sidewall of the groove, reducing wear during use, and also facilitate the flow of lubricating oil between the receiving cavities.

[0014] In some embodiments, a first sealing strip and a second sealing strip are included. One end of the first sealing strip is embedded in the inner ring, and one end of the second sealing strip is embedded in the outer ring. The other end of the first sealing strip abuts against the other end of the second sealing strip. The top of the first accommodating cavity is provided with a first opening, and the first sealing strip and the second sealing strip together close the first opening.

[0015] In some embodiments, the inner ring has a first groove, and the first sealing strip is fitted into the first groove; the outer ring has a second groove, and the second sealing strip is fitted into the second groove. The first groove ensures that the first sealing strip can be effectively fixed, and the second groove ensures that the second sealing strip can be effectively fixed.

[0016] In some embodiments, the bottom end of the second accommodating cavity is provided with a second opening, and the outer ring is provided with a first recess, the second opening communicating with the first recess. The first recess facilitates the insertion of external structures, thereby effectively sealing the second opening.

[0017] In some embodiments, the bottom of the inner ring is provided with a second recess, which is connected to the first recess, and the second recess is provided with a slope. The provision of the second recess can further increase the size of the external structure that can be provided in the first recess, while the slope can increase the contact area between the external structure and the second recess.

[0018] In some embodiments, a gear is provided on the outer side of the outer ring. The gear arrangement facilitates the effective driving of the outer ring by an external power device.

[0019] In some embodiments, the inner ring has a first connecting hole perpendicular to the horizontal plane, and the outer ring has a second connecting hole perpendicular to the horizontal plane. The first connecting hole facilitates the connection between the inner ring and an external structure, while the second connecting hole facilitates the connection between the outer ring and another external structure.

[0020] In some embodiments, the inner ring includes an upper inner ring and a lower inner ring, which are connected vertically, and the first side groove is formed by the upper and lower inner rings. This structure facilitates the acquisition of the first side groove on the inner ring and reduces the difficulty of machining the first side groove. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a three-row roller slewing bearing for a mobile crane according to one embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of a three-row roller slewing bearing for a mobile crane without an inner ring, according to one embodiment of the present invention.

[0023] Figure 3 This is a cross-sectional view of a three-row roller slewing bearing for a mobile crane, representing one embodiment of the present invention.

[0024] Figure 4 for Figure 3 An enlarged view of part A of the three-row roller slewing bearing used in mobile cranes.

[0025] Figure 5 This is a cross-sectional view of the outer ring of a three-row roller slewing bearing for a mobile crane, according to one embodiment of the present invention.

[0026] Figure 6 This is a cross-sectional view of the upper inner ring of a three-row roller slewing bearing for a mobile crane, according to one embodiment of this utility model.

[0027] Figure 7 This is a cross-sectional view of the lower inner ring of a three-row roller slewing bearing for a mobile crane, according to one embodiment of this utility model.

[0028] In the diagram: 1. Inner ring, 2. Outer ring, 3. First roller, 4. Second roller, 5. Third roller, 6. First spacer, 7. Second spacer, 8. First sealing strip, 9. Second sealing strip, 11. First side groove, 12. Second side groove, 13. Upper spacer, 14. Lower spacer, 15. First groove, 16. Second recess, 17. First connecting hole, 21. Center hole, 211. Boss, 22. Second groove, 23. First recess, 24. Second connecting hole, 25. Gear, 10. First receiving cavity, 20. Second receiving cavity, 30. Third receiving cavity, 101. First opening, 201. Second opening, 100. Upper inner ring, 200. Lower inner ring. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings.

[0030] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The present invention relates to a three-row roller slewing bearing for a mobile crane, comprising an inner ring 1, an outer ring 2, a first roller 3, a second roller 4, a third roller 5, a first isolation frame 6, and a second isolation frame 7.

[0031] The inner ring 1 has a first side groove 11 on its side, and a second side groove 12 is also provided on the side wall of the first side groove 11. In addition, the inner ring 1 may include an upper inner ring 100 and a lower inner ring 200, which are connected to each other by bolts, and the first side groove 11 can be formed by the upper inner ring 100 and the lower inner ring 200.

[0032] The outer ring 2 has a central hole 21 in the middle and a boss 211 on the side wall of the central hole 21. The inner ring 1 is located on the central hole 21. The boss 211 extends into the first side groove 11 and the boss 211 will separate the first receiving cavity 10 and the second receiving cavity 20 on the first side groove 11. At the same time, the boss 211 will also form a third receiving cavity 30 with the second side groove 12.

[0033] The first isolation frame 6 is fixedly mounted on the inner ring 1. The first isolation frame 6 is located in the first accommodating cavity 10. There can be multiple first rollers 3. All first rollers 3 are fixedly mounted on the first isolation frame 6, so that the first rollers 3 after installation are also located in the first accommodating cavity 10.

[0034] The second isolation frame 7 is fixedly mounted on the inner ring 1. The second isolation frame 7 is located in the second accommodating cavity 20. There can be multiple second rollers 4. All second rollers 4 are fixedly mounted on the second isolation frame 7, so that the second rollers 4 after installation are also located in the second accommodating cavity 20.

[0035] There are multiple third rollers 5, and all third rollers 5 are fixedly embedded in the third receiving cavity 30.

[0036] The dimensions of the first roller 3, the second roller 4, and the third roller 5 decrease sequentially, and the horizontal cross-sectional diameter of the third roller 5 should be less than 12mm. In this embodiment, the horizontal cross-sectional diameter of the third roller 5 should be 12mm.

[0037] The first roller 3, after being set, abuts against the top of the first side groove 11 of the inner ring 1 and also against the top of the boss 211 of the outer ring 2; the second roller 4 abuts against the bottom of the first side groove 11 of the inner ring 1 and also against the bottom of the boss 211 of the outer ring 2; the third roller 5 abuts against the side wall of the second side groove 12 of the inner ring 1 and also against the end of the boss 211 of the outer ring 2.

[0038] An upper spacer 13 and a lower spacer 14 are formed between the sidewalls of the boss 211 and the first side groove 11 at the upper and lower ends of the third roller 5, respectively. The third accommodating cavity 30 is connected to the bottom end of the first accommodating cavity 10 through the upper spacer 13, and the third accommodating cavity 30 is connected to the top end of the second accommodating cavity 20 through the lower spacer 14.

[0039] The three-row roller slewing bearing used in this mobile crane also includes a first sealing strip 8 and a second sealing strip 9. The inner ring 1 has a first groove 15, and one end of the first sealing strip 8 is fixedly embedded in the first groove 15. The outer ring 2 also has a second groove 22, and one end of the second sealing strip 9 is fixedly embedded in the second groove 22. The other ends of the first sealing strip 8 and the second sealing strip 9 abut against each other after installation.

[0040] The top of the first accommodating cavity 10 is provided with a first opening 101, and the first sealing strip 8 and the second sealing strip 9 together seal the first opening 101.

[0041] The bottom end of the second accommodating cavity 20 is provided with a second opening 201, and the bottom of the outer ring 2 is provided with a first recess 23. The second opening 201 is connected to the first recess 23. At the same time, the bottom of the inner ring 1 is provided with a second recess 16, which is connected to the first recess 23, and the second recess 16 is provided with an inclined portion.

[0042] The inner ring 1 is also provided with a number of first connecting holes 17 perpendicular to the horizontal plane. The first connecting holes 17 pass through the upper inner ring 100 and the lower inner ring 200. The outer ring 2 is provided with a number of second connecting holes 24 perpendicular to the horizontal plane. The outer side of the outer ring 2 is also provided with a gear 25.

[0043] This slewing bearing can be used in mobile cranes. Two components in the mobile crane that need to rotate relative to each other can be connected to the first connecting hole 17 and the second connecting hole 24 respectively by bolts, so that the two components that need to rotate relative to each other can be fixedly connected to the inner ring 1 and the outer ring 2 respectively.

[0044] The power unit in the mobile crane, such as the hydraulic cylinder, can mesh with the gear 25 on the outer ring 2, so that the power unit can drive the outer ring 2 to rotate, thereby causing relative rotation between the inner ring 1 and the outer ring 2, so that the two components on the mobile crane that are respectively connected to the inner ring 1 and the outer ring 2 can move relative to each other.

[0045] In this slewing bearing, the rollers arranged in each accommodating cavity form corresponding roller rows. The arrangement of multiple roller rows effectively ensures the load-bearing capacity of this invention, thus making it suitable for use with mobile cranes. Furthermore, because the rollers in each roller row have different dimensions, stress concentration can be reduced during the use of this invention, thereby avoiding local overload and improving fatigue life.

[0046] In addition, in order to reduce the internal friction between the inner ring 1 and the outer ring 2 when they rotate relative to each other, lubricating oil can be provided in the first accommodating cavity 10, the second accommodating cavity 20 and the third accommodating cavity 30. Since the first accommodating cavity 10, the second accommodating cavity 20 and the third accommodating cavity 30 are connected, the uniformity of the distribution of lubricating oil in each accommodating cavity can be effectively improved.

[0047] Furthermore, after the inner ring 1 is connected to the external component, a portion of the external component can extend into the first recess 23 and the second recess 16. This portion can increase the contact area with the inner ring 1 to improve the reliability of the connection with the inner ring 1. At the same time, this portion also seals the second opening 201, which can effectively reduce the probability of lubricating oil leakage.

[0048] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A three-row roller slewing bearing for a mobile crane, characterized in that, It includes an inner ring, an outer ring, a first roller, a second roller, a third roller, a first spacer, and a second spacer, wherein there are multiple first rollers, second rollers, and third rollers. The inner ring is provided with a first side groove, and a second side groove is provided on the side wall of the first side groove. The outer ring has a central hole, and a boss is provided on the side wall of the central hole. The inner ring is disposed on the central hole, and the boss extends into the first side groove. The boss separates a first receiving cavity and a second receiving cavity on the first side groove, and forms a third receiving cavity with the second side groove. Both the first and second isolation frames are fitted onto the inner ring. The first isolation frame is disposed within the first accommodating cavity, and the second isolation frame is embedded within the second accommodating cavity. The first roller is mounted on the first spacer and abuts against the inner and outer rings respectively. The second roller is mounted on the second spacer and abuts against the inner and outer rings respectively. The third roller is embedded in the third receiving cavity and abuts against the boss and the inner ring respectively. The dimensions of the first roller, the second roller, and the third roller decrease sequentially.

2. The three-row roller slewing bearing for a mobile crane according to claim 1, characterized in that, An upper gap and a lower gap are formed between the boss and the sidewall of the first side groove at the upper and lower ends of the third roller, respectively. The third accommodating cavity is connected to the bottom end of the first accommodating cavity through the upper gap, and the third accommodating cavity is connected to the top end of the second accommodating cavity through the lower gap.

3. The three-row roller slewing bearing for a mobile crane according to claim 2, characterized in that, It includes a first sealing strip and a second sealing strip. One end of the first sealing strip is embedded in the inner ring, and one end of the second sealing strip is embedded in the outer ring. The other end of the first sealing strip abuts against the other end of the second sealing strip. The top of the first accommodating cavity is provided with a first opening, and the first sealing strip and the second sealing strip together close the first opening.

4. The three-row roller slewing bearing for a mobile crane according to claim 3, characterized in that, The inner ring is provided with a first groove, and the first sealing strip is embedded in the first groove. The outer ring is provided with a second groove, and the second sealing strip is embedded in the second groove.

5. A three-row roller slewing bearing for a mobile crane according to claim 3, characterized in that, The second accommodating cavity has a second opening at its bottom end, and the outer ring has a first recess. The second opening is connected to the first recess.

6. A three-row roller slewing bearing for a mobile crane according to claim 5, characterized in that, The bottom of the inner ring is provided with a second recess, which is connected to the first recess, and the second recess is provided with an inclined portion.

7. A three-row roller slewing bearing for a mobile crane according to claim 1, characterized in that, The outer ring has a gear on its outer side.

8. A three-row roller slewing bearing for a mobile crane according to claim 1, characterized in that, The inner ring has a first connecting hole perpendicular to the horizontal plane, and the outer ring has a second connecting hole perpendicular to the horizontal plane.

9. A three-row roller slewing bearing for a mobile crane according to claim 1, characterized in that, The inner ring includes an upper inner ring and a lower inner ring, which are connected vertically. The first side groove is formed by the upper inner ring and the lower inner ring.

Images