Double-row tapered roller bearing with combined outer ring

Abstract

The utility model belongs to the technical field of double-row tapered roller bearings, and particularly relates to a double-row tapered roller bearing with a combined outer ring. Comprising a double-roller-way inner ring and a combined outer ring, the double-roller-way inner ring is sleeved with two integrated retainers, a plurality of rollers are rotationally installed between the integrated retainers and the double-roller-way inner ring, the combined outer ring comprises a fixed outer ring and two single-roller-way outer rings, protruding keys are arranged on the inner wall of the fixed outer ring, outer ring grooves are formed in the outer walls of the single-roller-way outer rings, and the outer ring grooves are communicated with the fixed outer ring. The fixed outer ring and the single-roller-way outer rings are clamped through the outer ring grooves and the convex keys, and the two single-roller-way outer rings are connected to the outer sides of the two integrated retainers in a sleeving mode respectively. The bearing is provided with the combined outer ring, the bearing clearance can be pre-adjusted, the axial clearance is not required to be further adjusted by a method of adjusting the clearance of a bearing seat gland during assembly, and the adverse effect caused by overlarge or oversmall clearance due to unreasonable pre-tightening force when the bearing is used and mounted is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of double-row tapered roller bearings, in particular 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 an important component 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. The double-row tapered roller thrust bearing in the rolling mill mainly bears axial loads and combined radial loads, which are mainly axial loads. It has high axial impact load capacity and biaxial positioning capability. 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 easily 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 purpose of the utility model 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 utility model to solve its technical problems 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 externally connected to the double-roller inner ring. Several 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 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 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 oblique sides 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 number of hollows are evenly arranged on the integrated retainer.

[0008] Furthermore, the roller is installed in the hollow, one side of the roller rolls and abuts against the roller, and the other side of the roller passes through the hollow 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 trumpet-shaped, and the inclined surface of the trumpet-shaped inner wall of the single roller outer ring is parallel to the inclined surface of the trumpet structure of the integrated retainer.

[0010] Furthermore, an oil groove is provided in the middle position of the outer wall of the fixed outer ring, and 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, and the two single roller outer rings are abutted on the two side walls of the raised spacer, and outer ring key grooves are opened at both ends of the fixed outer ring.

[0011] The utility model has the following beneficial effects:

[0012] When using double-row tapered roller bearings, a certain amount of axial clearance must be maintained to cope with thermal expansion and contraction during operation, as well as to ensure that the bearings maintain the correct position during rotation and reduce the skew and unbalanced load of the bearings caused by 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, without the need to further adjust the axial clearance by adjusting the bearing seat cover gap during assembly. This avoids the adverse effects caused by excessive or insufficient clearance due to unreasonable preload applied during bearing installation. At the same time, the outer ring groove and convex key clamping method on the combined outer ring can fix the combined outer ring, avoid axial rotational wear with the inner wall of the bearing seat, and ensure the operating accuracy of the bearing. The inner ring keyway adopts a double keyway symmetrical design to achieve uniform force transmission on the inner ring and avoid keyway damage. The components of the utility model 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 structural diagram of the utility model.

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0015] Figure 3 It is a schematic diagram of the disassembly structure of the utility model.

[0016] Figure 4 It is a schematic diagram of the internal disassembly structure of the utility model.

[0017] Figure 5 This is a real picture of the utility model.

[0018] Figure 6 This 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 This is a schematic diagram of roller damage in a double-row tapered roller bearing in the prior art.

[0020] Figure 8 This 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 solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended 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 integral retainers 2 are attached to the outer surface of the double-roller inner ring 1. Several rollers 3 are rotatably mounted between the integral 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. The fixed outer ring 4 has a key 7 on its inner wall, and the single-roller outer rings 5 ​​have outer ring grooves 6 on their outer walls. The fixed outer ring 4 and the single-roller outer rings 5 ​​are connected via the outer ring grooves 6 and the key 7. The two single-roller outer rings 5 ​​are respectively sleeved onto the outer sides of the two integral retainers 2. The fixed outer ring 4 and the two single-roller outer rings 5 ​​form the combined outer ring, which adjusts the bearing clearance and prevents relative rotational wear of the outer rings during operation, as well as impact damage caused by the free oscillation of the single-roller outer rings 5 ​​on the non-loaded side when unstressed.

[0024] The double-roller inner ring 1 is annular, with an isosceles trapezoidal cross-section. The two oblique sides of the isosceles trapezoidal structure form two symmetrical inclined planes, on which rollers 14 are provided. Annular grooves 8 are provided on both sides of the bottom of rollers 14 to prevent stress concentration and contact damage between the edges of rollers 3 and rollers 14. Two inner ring keyways 9 are symmetrically provided at both ends of the double-roller inner ring 1. Because the work roll bearings are installed on the work roll necks with a clearance fit, two inner ring keyways 9 are provided on the double-roller inner ring 1 to prevent relative sliding between the bearing inner ring and the work roll neck. The bearings are connected and fixed to the work roll necks via the inner ring keyways 9, and the rotation of the work rolls drives the bearing inner rings to rotate.

[0025] The integrated retainer 2 has a bell-mouth structure, the inclined surface of which is parallel to the inclined surface of the double roller inner ring 1. The two integrated retainers 2 correspond to the two inclined surfaces of the double roller inner ring 1, and a number of hollows are evenly distributed on the integrated retainer 2. The integrated retainer 2 evenly distributes the rollers 3 and guides them to roll between the roller 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, with one side of the roller 3 rolling and abutting 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 trumpet-shaped. The inclined surface of the trumpet-shaped inner wall of the single roller outer ring 5 is parallel to the inclined surface of the trumpet structure of the integrated retaining frame 2.

[0028] An oil groove 10 is located in the middle of the outer wall of the stationary outer ring 4. A raised spacer 11 is located on the inner wall of the stationary outer ring 4, corresponding to the oil groove 10. Several oil holes 12 are evenly distributed within the oil groove 10, extending through the stationary outer ring 4. The two single-roller outer rings 5 ​​abut against the two sidewalls of the raised spacer 11. Each end of the stationary outer ring 4 features an outer ring keyway 13, which connects to the key on the bearing seat, securing the relative position of the bearing assembly outer rings and preventing wear and damage caused by circumferential rotation within the bearing seat. The outer ring grooves 6 on the two single-roller outer rings 5 ​​engage the raised keys 7 on the stationary outer ring 4. The inner end faces of the single-roller outer rings 5 ​​press against the sidewall end faces of the raised spacer 11 on the stationary outer ring 4, controlling the axial clearance of the bearings. This ensures that the bearings are properly adjusted before installation and can be used directly, eliminating the need for further adjustment of axial clearance by adjusting the clearance between the bearing seat and the gland during assembly. At the same time, the engagement between the outer ring groove 6 and the cam 7 can prevent the combined outer ring from rotating relative to each other, thereby avoiding wear of the outer ring.

[0029] The working principle of this utility model is:

[0030] During use, the double-roller inner ring 1 is sleeved onto the work roll neck and secured to the work roll neck via the inner ring keyway 9. The outer ring keyway 13 is secured to the key on the bearing seat. The combined outer ring consists of a fixed outer ring 4 and two single-roller outer rings 5. The two single-roller outer rings 5 ​​abut the sidewalls of a raised spacer 11. The lateral width of the raised spacer 11 represents the clearance between the two single-roller outer rings 5. By machining the lateral width of the raised spacer 11, the clearance between the two single-roller outer rings 5 ​​is pre-adjusted to account for thermal expansion and contraction during operation, ensuring the bearing maintains its correct position during rotation and reducing bearing misalignment caused by axial force. The clearance between the two single-roller outer rings 5 ​​is already adjusted after the bearing is machined, and no further adjustment is required during assembly. The combined outer rings feature an embedded connection. The single-roller outer ring 5 is embedded within the fixed outer ring 4, and a key 7 on the inner wall of the fixed outer ring 4 engages with a groove 6 in the outer ring. This keyway connection offers advantages such as simple structure and excellent connection stability, preventing wear and damage to the bearing outer rings from circumferential relative rotation during use. The fixed outer ring 4 wraps around the two single-roller outer rings 5, securing them together. This prevents the single-roller outer ring 5 on the non-load-bearing side from freely oscillating during operation, potentially causing impact damage or fracture. It also avoids unbalanced loads caused by a loose bearing assembly.

[0031] The above-described embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Any modifications and improvements to the technical solution of the present invention made by a person of ordinary skill in the art without departing from the design concept of the present invention shall fall within the scope of protection of the present invention.

[0032] The technology, shape and structure that are not described in detail in this utility model are all well-known technologies.

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. Several 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 oblique sides 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 number 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 against the roller, and the other side of the roller passes through the hollow of the integrated retainer and rolls and abuts against 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 trumpet-shaped. The inclined surface of the trumpet-shaped inner wall of the single roller outer ring is parallel to the inclined surface of the trumpet 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, and 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. The two single roller outer rings are abutted on the two side walls of the raised spacer, and outer ring key grooves are provided at both ends of the fixed outer ring.

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