Double-row tapered roller bearing with combined outer ring
By designing a combined outer ring structure in double row tapered roller bearings, and using the clamping method of fixed outer ring and single roller outer ring, the problem of difficulty in adjusting axial clearance and no fixation of the outer ring during use is solved, and the bearing is stable operation and extended service life is achieved.
Patent Information
- Application Number
- CN202411786767.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-03-21
AI Technical Summary
During the use of existing double-row tapered roller bearings, there are problems such as difficulty in adjusting the axial clearance, no fixed outer ring, and loose combinations, which lead to excessive loading, which is easy to damage and affect the normal production of the rolling mill.
A double-row tapered roller bearing with a combined outer ring is designed. By fixing the outer ring, a single roller outer ring and the outer ring groove and convex key, the bearing clearance is pre-adjusted and the outer ring fixation is achieved, thereby avoiding the skew and stress load caused by axial forces during use.
Pre-adjustment of the bearing clearance before installation is achieved, avoiding the problem of adjusting the gear gland clearance during assembly, reducing the risk of bearing damage, extending the service life of the bearing, and ensuring the stability of rolling.
Smart Images
Figure CN119664796A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of double-row tapered roller bearings, and in particular relates to a double-row tapered roller bearing with a combined outer ring. Background Art
[0002] Double-row tapered roller bearings are usually used as thrust bearings on the working rolls of hot rolling mills. They play the role of supporting the rotation of the rolls and axial positioning, and are important components in the bearing seat of the working rolls of the rolling mill. The thrust bearing installed on the bearing seat of the hot rolling working roll is a common mechanical component, usually composed of an outer ring, a roller, a retainer, an inner ring and other parts. Its function is to axially position the working roll, prevent the axial movement of the working roll, and support and control the axial force when the working rolls of the rolling mill rotate at high speed. Double-row tapered roller thrust bearings in the rolling mill mainly bear axial loads and combined radial loads, and have high axial impact load capacity and dual axial positioning capabilities. During use, we found that the current form of thrust bearings cannot be used directly. The axial clearance needs to be adjusted during the bearing assembly, the outer ring of the bearing is not fixed, and the loose bearing combination causes unbalanced loads, which makes the bearings easy to be damaged (such as Figure 6-8 As shown), it causes production accidents and affects the normal rolling production of the rolling mill. Summary of the invention
[0003] The object of the present invention is to provide a double-row tapered roller bearing with a combined outer ring to solve the problems existing in the prior art.
[0004] The technical solution adopted by the present invention to solve the technical problem is:
[0005] A double-row tapered roller bearing with a combined outer ring comprises a double-roller inner ring and a combined outer ring. Two integral retainers are connected to the outer surface of the double-roller inner ring. A plurality of rollers are rotatably mounted between the integral retainer and the double-roller inner ring. The combined outer ring comprises a fixed outer ring and two single-roller outer rings. A convex key is arranged on the inner wall of the fixed outer ring, and an outer ring groove is arranged on the outer wall of the single-roller outer ring. The fixed outer ring and the single-roller outer ring are clamped together by the outer ring groove and the convex key. The two single-roller outer rings are respectively sleeved on the outer sides of the two integral retainers.
[0006] Furthermore, the inner ring of the double roller is annular, and the cross-section of the inner ring of the double roller is an isosceles trapezoidal structure. The two hypotenuses of the isosceles trapezoidal structure of the inner ring of the double roller form two symmetrical inclined planes, on which rollers are provided. Annular grooves are provided on both sides of the bottom of the roller, and two inner ring keyways are symmetrically provided at both ends of the inner ring of the double roller.
[0007] Furthermore, the integrated retainer is a bell-mouth structure, the inclined surface of the integrated retainer bell-mouth structure is parallel to the inclined surface of the double roller inner ring, the two integrated retainers correspond to the two inclined surfaces of the double roller inner ring respectively, and a plurality of hollows are evenly arranged on the integrated retainer.
[0008] Furthermore, the roller is installed in the hollow part, one side of the roller rolls and abuts against the roller, and the other side of the roller passes through the hollow part of the integrated retainer and rolls and abuts against the outer ring of the single roller.
[0009] Furthermore, the outer wall of the single roller outer ring is annular and the inner wall is bell-mouth shaped, and the inclined surface of the bell-mouth shaped inner wall of the single roller outer ring is parallel to the inclined surface of the integrated retaining frame bell-mouth structure.
[0010] Furthermore, an oil groove is provided in the middle position of the outer wall of the fixed outer ring, a raised spacer is provided on the inner wall of the fixed outer ring corresponding to the oil groove, a number of oil holes penetrating the fixed outer ring are evenly opened in the oil groove, two single roller outer rings are abutted against two side walls of the raised spacer, and outer ring key grooves are opened at both ends of the fixed outer ring.
[0011] The present invention has the following beneficial effects:
[0012] When double-row tapered roller bearings are used, a certain axial clearance needs to be ensured to cope with thermal expansion and contraction during operation, as well as to ensure that the bearings maintain the correct position during rotation, and to reduce the skewed force and partial load of the bearings caused by the axial force. The combined outer ring can control the relative distance between the two single roller outer rings to achieve pre-adjustment of the bearing clearance. The bearing clearance has been adjusted before installation and can be used directly. There is no need to further adjust the axial clearance by adjusting the gap of the bearing seat cover during assembly, so as to avoid the unreasonable preload force applied during the use and installation of the bearing, resulting in the adverse effects caused by excessive or too small clearance; at the same time, the outer ring groove and convex key clamping method on the combined outer ring can play a role in fixing the combined outer ring, avoiding axial rotation wear with the inner wall of the bearing seat, and ensuring the running accuracy of the bearing; the inner ring keyway adopts a double keyway symmetrical design to achieve uniform force transmission of the inner ring and avoid damage to the keyway; the components of the present invention are tightly combined and stably connected, which can effectively avoid bearing damage, thereby extending the service life of the bearing and ensuring the stability of rolling. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the structure of the present invention.
[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.
[0015] Figure 3 It is a schematic diagram of the disassembled structure of the present invention.
[0016] Figure 4 It is a schematic diagram of the internal disassembled structure of the present invention.
[0017] Figure 5 It is a physical picture of the present invention.
[0018] Figure 6 It is a schematic diagram of the fracture of the outer ring of a double-row tapered roller bearing in the prior art.
[0019] Figure 7 It is a schematic diagram of roller damage of a double-row tapered roller bearing in the prior art.
[0020] Figure 8 It is a schematic diagram of the fracture of the outer ring of a double-row tapered roller bearing in the prior art.
[0021] Among them: 1. Double roller inner ring; 2. Integrated cage; 3. Roller; 4. Fixed outer ring; 5. Single roller outer ring; 6. Outer ring groove; 7. Key; 8. Annular groove; 9. Inner ring keyway; 10. Oil groove; 11. Raised spacer; 12. Oil hole; 13. Outer ring keyway; 14. Roller. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0023] like Figure 1-5 As shown, a double-row tapered roller bearing with a combined outer ring includes a double roller inner ring 1 and a combined outer ring. Two integrated retainers 2 are connected to the outer surface of the double roller inner ring 1. A plurality of rollers 3 are rotatably mounted between the integrated retainer 2 and the double roller inner ring 1. The combined outer ring includes a fixed outer ring 4 and two single roller outer rings 5. A convex key 7 is provided on the inner wall of the fixed outer ring 4. An outer ring groove 6 is provided on the outer wall of the single roller outer ring 5. The fixed outer ring 4 and the single roller outer ring 5 are clamped by the outer ring groove 6 and the convex key 7. The two single roller outer rings 5 are respectively sleeved on the outer sides of the two integrated retainers 2. The fixed outer ring 4 and the two single roller outer rings 5 form a combined outer ring to adjust the bearing clearance and avoid the relative rotation wear of the outer ring during operation and the impact damage caused by the free shaking of the single roller outer ring 5 on the non-load side under the unstressed state.
[0024] The inner ring 1 of the double roller table is annular, and the cross section of the inner ring 1 of the double roller table is an isosceles trapezoidal structure. The two hypotenuses of the isosceles trapezoidal structure of the inner ring 1 of the double roller table form two symmetrical inclined planes, on which rollers 14 are provided. Annular grooves 8 are provided on both sides of the bottom of the roller table 14 to avoid stress concentration and contact damage between the edge of the roller 3 and the roller table 14. Two inner ring keyways 9 are symmetrically provided at both ends of the inner ring 1 of the double roller table. Because the working roll bearing is installed on the working roll neck with a clearance fit, in order to avoid relative sliding between the inner ring of the bearing and the roll neck of the working roll, two inner ring keyways 9 are provided on the inner ring 1 of the double roller table, and the bearing is connected and fixed on the roll neck of the working roll through the inner ring keyway 9. When the working roll rotates, the inner ring of the bearing is driven to rotate.
[0025] The integrated cage 2 is a bell-mouth structure, the inclined surface of the bell-mouth structure of the integrated cage 2 is parallel to the inclined surface of the double roller inner ring 1, the two integrated cages 2 correspond to the two inclined surfaces of the double roller inner ring 1, and a number of hollows are evenly arranged on the integrated cage 2. The integrated cage 2 evenly distributes the rollers 3 and guides the rollers 3 to roll between the rollers 14 of the double roller inner ring 1 and the upper single roller outer ring 5.
[0026] The roller 3 is installed in the hollow, one side of the roller 3 rolls and abuts against the roller 14, and the other side of the roller 3 passes through the hollow of the integrated retainer 2 and rolls and abuts against the single roller outer ring 5.
[0027] The outer wall of the single roller outer ring 5 is annular and the inner wall is bell-mouth shaped. The inclined surface of the bell-mouth shaped inner wall of the single roller outer ring 5 is parallel to the inclined surface of the bell-mouth structure of the integrated retaining frame 2 .
[0028] An oil groove 10 is provided in the middle of the outer wall of the fixed outer ring 4. A raised spacer 11 is provided on the inner wall of the fixed outer ring 4 corresponding to the oil groove 10. A number of oil holes 12 penetrating the fixed outer ring 4 are evenly provided in the oil groove 10. The two single roller outer rings 5 abut against the two side walls of the raised spacer 11. The fixed outer ring 4 is provided with outer ring keyways 13 at both ends for connection and fixing with the key on the bearing seat to ensure the relative position of the outer ring of the bearing assembly and avoid the wear and damage caused by the circumferential rotation of the bearing outer ring in the bearing seat. The outer ring grooves 6 on the two single roller outer rings 5 are clamped with the raised keys 7 of the fixed outer ring 4. The inner end faces of the single roller outer rings 5 are pressed against the side wall end faces of the raised spacer 11 on the fixed outer ring 4, which can control the axial clearance of the bearing, so that the clearance of the bearing has been adjusted before installation and can be used directly, without further adjusting the axial clearance by adjusting the clearance of the bearing seat gland during assembly. At the same time, the clamping connection between the outer ring groove 6 and the convex key 7 can prevent the combined outer ring from relative rotation and avoid wear of the outer ring.
[0029] The working principle of the present invention is:
[0030] When in use, the double roller inner ring 1 is sleeved on the neck of the working roll and fixedly connected to the neck of the working roll through the inner ring keyway 9, and the outer ring keyway 13 is fixedly connected to the key on the bearing seat. The combined outer ring is composed of a fixed outer ring 4 and two single roller outer rings 5. The two single roller outer rings 5 are abutted against the side walls of the raised spacer 11. The lateral width of the raised spacer 11 is the clearance between the two single roller outer rings 5. The clearance between the two single roller outer rings 5 is pre-adjusted by machining the lateral width of the raised spacer 11 to cope with thermal expansion and contraction during operation, and to ensure that the bearing maintains the correct position during rotation, reducing the skew force and eccentric load of the bearing caused by axial force. After the bearing is machined, the clearance between the two single roller outer rings 5 has been adjusted, and no further adjustment is required during assembly. The combined outer ring is an embedded connection, the single roller outer ring 5 is embedded in the fixed outer ring 4, and the convex key 7 on the inner wall of the fixed outer ring 4 is clamped with the outer ring groove 6. This keyway connection method has the advantages of simple structure and good connection stability, and can prevent the outer ring of the bearing from being damaged by relative rotation in the circumferential direction during use. The fixed outer ring 4 wraps the two single roller outer rings 5, and the two single roller outer rings 5 are combined and fixed to each other, preventing the single roller outer ring 5 on the non-load side of the bearing from shaking freely when it is in a stress-free state during operation, causing impact damage, fracture and other problems, and can also avoid the problem of unbalanced load caused by loose bearing combination.
[0031] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should all fall within the scope of protection of the present invention.
[0032] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.
Claims
1. A double-row tapered roller bearing with a combined outer ring, characterized in that: It includes a double-roller inner ring and a combined outer ring. The double-roller inner ring is connected to two integral retaining frames. A number of rollers are rotatably installed between the integral retaining frame and the double-roller inner ring. The combined outer ring includes a fixed outer ring and two single-roller outer rings. A convex key is provided on the inner wall of the fixed outer ring, and an outer ring groove is provided on the outer wall of the single-roller outer ring. The fixed outer ring and the single-roller outer ring are clamped together by the outer ring groove and the convex key. The two single-roller outer rings are respectively sleeved on the outside of the two integral retaining frames.
2. The double-row tapered roller bearing with a combined outer ring according to claim 1, characterized in that: The inner ring of the double roller is annular, and the cross-section of the inner ring of the double roller is an isosceles trapezoidal structure. The two hypotenuses of the isosceles trapezoidal structure of the inner ring of the double roller form two symmetrical inclined planes, on which rollers are provided. Annular grooves are provided on both sides of the bottom of the roller, and two inner ring keyways are symmetrically provided at both ends of the inner ring of the double roller.
3. The double-row tapered roller bearing with a combined outer ring according to claim 2, characterized in that: The integrated retainer is a bell-mouth structure, the inclined surface of the integrated retainer bell-mouth structure is parallel to the inclined surface of the double roller inner ring, the two integrated retainers correspond to the two inclined surfaces of the double roller inner ring respectively, and a plurality of hollows are evenly arranged on the integrated retainer.
4. The double-row tapered roller bearing with a combined outer ring according to claim 3, characterized in that: The roller is installed in the hollow, one side of the roller rolls and abuts in the roller, and the other side of the roller passes through the hollow of the integrated retainer and rolls and abuts on the outer ring of the single roller.
5. The double-row tapered roller bearing with a combined outer ring according to claim 4, characterized in that: The outer wall of the single roller outer ring is annular and the inner wall is bell-mouth shaped. The inclined surface of the bell-mouth shaped inner wall of the single roller outer ring is parallel to the inclined surface of the bell-mouth structure of the integrated retainer.
6. The double-row tapered roller bearing with a combined outer ring according to claim 5, characterized in that: An oil groove is provided in the middle position of the outer wall of the fixed outer ring, a raised spacer is provided on the inner wall of the fixed outer ring corresponding to the oil groove, a plurality of oil holes penetrating the fixed outer ring are evenly opened in the oil groove, two single roller outer rings are abutted against two side walls of the raised spacer, and outer ring key grooves are opened at both ends of the fixed outer ring.