Inner ring connecting structure of double-row tapered roller bearing
By creating a countersunk groove on the inner ring of a double-row tapered roller bearing and embedding a limiting component, the problem of relative displacement of the inner ring under the snap ring connection method is solved, resulting in a more stable connection and a longer service life, while simplifying installation and maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG YIJIXI PRECISION MFG CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-04-14
AI Technical Summary
The existing snap ring connection method for the inner ring of double-row tapered roller bearings is prone to relative displacement when operating at high speeds or under heavy loads. This leads to the disruption of the fit between internal bearing components, increased friction and wear, and affects the stability and lifespan of the equipment.
First and second countersunk grooves are made on the inner ring of the bearing to form an embedding groove, and a limiting element is embedded to achieve mechanical self-locking, enhance the connection strength of the inner ring, and prevent relative rotation and displacement.
It improves the stability and lifespan of bearings under complex loads, simplifies the installation process, reduces maintenance costs and time, and enhances the operational stability and reliability of equipment.
Smart Images
Figure CN224120552U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of double-row tapered roller bearings, and particularly relates to an inner ring connection structure for a double-row tapered roller bearing. Background Technology
[0002] In modern mechanical industry, double-row tapered roller bearings are a key mechanical component, widely used in various mechanical equipment that need to withstand large combined radial and axial loads, such as automotive transmissions, heavy machinery transmission systems, and main shafts of large industrial equipment. Their unique double-row tapered roller structure design allows them to withstand loads from different directions simultaneously in complex working environments, ensuring the smoothness and reliability of equipment operation. A typical double-row tapered roller bearing mainly consists of an outer ring, two inner rings, a cage, and double-row tapered rollers. The two inner rings are designed as separate units, which facilitates bearing installation, disassembly, and maintenance, allowing for more efficient replacement or maintenance of inner ring components, reducing maintenance costs and time.
[0003] However, in existing technologies, the connection between the two inner rings of a double-row tapered roller bearing is commonly achieved using snap rings. While snap ring connections offer advantages such as simple structure and convenient installation, they have revealed a series of serious problems in practical use. Due to the inherent mechanical properties of the snap ring connection and the influence of various complex factors in the working environment, this connection method often suffers from insecure connections. When the bearing operates at high speed or bears a large load, relative displacement can easily occur between the inner rings. This displacement not only disrupts the normal fit between the internal components of the bearing, altering the contact state between the rollers and the inner and outer ring raceways, increasing friction and wear, and reducing the bearing's service life, but it can also cause unstable equipment operation, generating vibration and noise, seriously affecting the performance and precision of the entire mechanical equipment, and may even lead to equipment failure, resulting in production stoppages and economic losses. Therefore, existing technologies require further improvement and enhancement. Utility Model Content
[0004] This utility model provides a connection structure for the inner rings of a double-row tapered roller bearing, which solves the problem that when the two inner rings are connected by a snap ring, relative displacement easily occurs between the inner rings when the bearing is running at high speed or under heavy load, resulting in damage to the fit between the internal components of the bearing, changes in the contact state between the rollers and the raceway, increased friction and wear, and reduced bearing life.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] A double-row tapered roller bearing inner ring connection structure includes a first bearing inner ring and a second bearing inner ring arranged coaxially and symmetrically. The inner wall surface of the first bearing inner ring is provided with a first groove, and the first groove forms a first opening at the end face of the first bearing inner ring. The inner wall surface of the second bearing inner ring is provided with a second groove, and the second groove forms a second opening at the end face of the second bearing inner ring.
[0007] The first opening and the second opening are axially aligned, so that the first sink and the second sink are joined together to form an embedding groove; a limiting member adapted to the shape of the groove is embedded in the embedding groove to restrict relative rotation between the inner ring of the first bearing and the inner ring of the second bearing.
[0008] The aforementioned structure, by creating a first countersunk groove and a second countersunk groove on the inner rings of the first and second bearings respectively, forms an embedded groove after splicing, in which the limiting component is tightly embedded. This embedded design achieves mechanical self-locking, significantly enhancing the connection strength between the inner rings. The presence of the limiting component effectively resists lateral forces from different directions, preventing relative rotation and displacement between the inner rings. This resistance to lateral forces is particularly important for mechanical equipment subjected to complex loads, ensuring the bearing remains stable during high-speed operation or under heavy loads. The elimination of relative displacement reduces friction and wear, extends bearing life, improves equipment operational stability and reliability, simplifies the installation process, and increases installation efficiency. Simultaneously, the presence of the limiting component also facilitates subsequent maintenance and replacement work.
[0009] In the preferred implementation, the limiting member and the insert groove are interference-fitted and detachably connected.
[0010] In a preferred embodiment, after the limiting member is installed into the embedding groove, the limiting member is welded to the groove wall of the embedding groove using a welding process.
[0011] In a preferred embodiment, the depth of the embedding groove is greater than or equal to the thickness of the limiting member, such that after the limiting member is installed into the embedding groove, the exposed surface of the limiting member is lower than or flush with the inner wall surfaces of the first bearing inner ring and the second bearing inner ring, so as to meet the shaft installation requirements.
[0012] When the surface of the limiting component is lower than or flush with the inner wall surface, installation is convenient, the load on the shaft and the inner ring of the bearing is evenly distributed, and local stress concentration is avoided.
[0013] In the preferred implementation, the first settling tank and the second settling tank are set up in a mirror-symmetrical manner.
[0014] By using the mirror symmetry design of the first and second recesses, the inner rings of the two bearings are completely identical. The inner rings of the first and second bearings are completely identical, eliminating the need to distinguish between left and right during assembly and reducing the risk of operational errors.
[0015] In a preferred embodiment, both the first and second sinks are provided with positioning grooves. The depth of the positioning grooves is greater than that of the first and second sinks. The limiting member is provided with a positioning protrusion corresponding to the positioning groove. The positioning protrusion is inserted into the positioning groove to prevent the inner ring of the first bearing and the inner ring of the second bearing from axially displacing relative to each other.
[0016] The positioning groove is designed to be deeper than the first and second recessed grooves. When the limiting component is installed in place, the positioning protrusion is fully embedded in the positioning groove, and the top of the protrusion forms a contact surface with the bottom surface of the positioning groove. The remaining depth of the recessed groove is used to accommodate the main body of the limiting component. Because the positioning protrusion and the positioning groove have a depth difference in the axial direction, the inner rings cannot move relative to each other in the axial direction, further restricting the relative displacement of the two inner rings in the axial and circumferential directions.
[0017] In a preferred embodiment, multiple embedding grooves are evenly arranged along the axial direction of the inner rings of the first and second bearings, and each embedding groove is provided with a corresponding limiting member.
[0018] In a preferred implementation, the embedding groove is a rectangular groove, and the depth of the embedding groove is 1 / 5 to 1 / 3 of the wall thickness of the inner ring of the first bearing or the inner ring of the second bearing.
[0019] In the preferred implementation, the limiting element is a rectangular block or a rectangular hollow tube. Attached Figure Description
[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain this application and do not constitute an undue limitation of the present invention. In the drawings:
[0021] Figure 1 A schematic three-dimensional structural diagram of one embodiment of the inner ring of the first bearing and the inner ring of the second bearing of this application is shown.
[0022] Figure 2 A schematic three-dimensional structural diagram illustrating an embodiment of the first bearing inner ring and the second bearing inner ring of this application having their end faces aligned and in contact.
[0023] Figure 3 The illustration shows a schematic cross-sectional structural diagram of one embodiment in which the first bearing inner ring and the second bearing inner ring of this application are assembled inside the bearing;
[0024] Label Explanation:
[0025] 1. First bearing inner ring; 10. First recess; 11. First opening; 2. Second bearing inner ring; 20. Second recess; 21. Second opening; 3. Embedded groove; 30. Positioning groove; 4. Limiting member; 40. Positioning protrusion. Detailed Implementation
[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.
[0027] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In this utility model, unless otherwise expressly specified and limited, the first feature being "upper" or "lower" than the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.
[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0029] In this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.
[0030] The present invention will now be described with reference to the accompanying drawings.
[0031] The specific solution adopted is as follows:
[0032] like Figure 1-3As shown, this utility model provides a double-row tapered roller bearing inner ring connection structure, including a first bearing inner ring 1 and a second bearing inner ring 2 arranged coaxially and symmetrically. The inner wall surface of the first bearing inner ring 1 is provided with a first groove 10, and the first groove 10 forms a first opening 11 at the end face of the first bearing inner ring 1. The inner wall surface of the second bearing inner ring 2 is provided with a second groove 20, and the second groove 20 forms a second opening 21 at the end face of the second bearing inner ring 2.
[0033] The first opening 11 and the second opening 21 are axially corresponding to each other, so that the first sink 10 and the second sink 20 are spliced together to form an embedding groove 3; a limiting member 4 adapted to the shape of the groove is embedded in the embedding groove 3 to restrict relative rotation between the inner ring 1 of the first bearing and the inner ring 2 of the second bearing.
[0034] This application presents a double-row tapered roller bearing inner ring connection structure. A first countersunk groove 10 and a second countersunk groove 20 are respectively formed on the first bearing inner ring 1 and the second bearing inner ring 2, which, after splicing, form an embedded groove 3 in which a retaining member 4 is tightly embedded. This embedded design achieves mechanical self-locking, greatly enhancing the connection strength between the inner rings. The presence of the retaining member 4 effectively resists lateral forces from different directions, preventing relative rotation and displacement between the inner rings. This resistance to lateral forces is particularly important for mechanical equipment subjected to complex loads, ensuring the bearing remains stable during high-speed operation or under large loads.
[0035] Due to the tight fit of the limiting component 4, no relative displacement occurs between the inner ring 1 of the first bearing and the inner ring 2 of the second bearing during operation. This ensures the normal fit between the internal components of the bearing and maintains a stable contact state between the rollers and the inner and outer raceways. The elimination of relative displacement reduces friction and wear, extends the service life of the bearing, and improves the operational stability and reliability of the equipment.
[0036] After the shaft is fitted into the inner ring, the limiting component 4 is further restricted. Compared with the connection method of the snap ring (ring), this design simplifies the installation process and improves installation efficiency. At the same time, the presence of the limiting component 4 also facilitates subsequent maintenance and replacement work. When it is necessary to replace or maintain the relevant parts of the inner ring, the limiting component 4 can be more easily disassembled and reinstalled, reducing maintenance costs and time.
[0037] In a preferred embodiment of this application, the limiting member 4 and the insert groove 3 are interference-fitted and detachably connected. Mechanical locking is achieved by utilizing the elastic deformation of the material through the outer diameter of the limiting member 4 being slightly larger than the inner diameter of the insert groove 3. The length of the limiting member 4 is shorter than the insert groove 3, leaving sufficient space in the insert groove 3 after the limiting member 4 is inserted. This allows for easy removal of the limiting member 4 using tools inserted into the space. Installation is quick and requires no repeated adjustments, and the limiting member 4 can be reused. Conversely, if the retaining spring breaks, it needs to be replaced, significantly reducing maintenance costs.
[0038] As a preferred embodiment of this application, after the limiting member 4 is installed into the embedding groove 3, the limiting member 4 is welded and fixed to the groove wall of the embedding groove 3 by welding process.
[0039] In the inner ring connection structure of a double-row tapered roller bearing, after the limiting member 4 is installed into the embedded groove 3, a partial welding fixation method (rather than welding along the entire circumference of the groove wall) is adopted, which simplifies the operation process and significantly improves the connection reliability. By setting 3 to 4 weld points (or short welds) in the key stress areas (such as the two ends and the symmetrical position in the middle) of the contact surface between the limiting member 4 and the embedded groove 3, the welding stress is dispersed, avoiding the stress superposition effect of continuous welds. After welding, the limiting member 4 and the embedded groove 3 form an integral composite connection, further improving the torsional stiffness. It is especially suitable for high-end equipment manufacturing fields that are sensitive to precision, lifespan, and cost (such as wind turbine gearboxes, precision machine tool spindles, etc.).
[0040] In a preferred embodiment of this application, the depth of the embedding groove 3 is greater than or equal to the thickness of the limiting member 4, such that after the limiting member 4 is installed into the embedding groove 3, the exposed surface of the limiting member 4 is lower than or flush with the inner wall surfaces of the first bearing inner ring 1 and the second bearing inner ring 2, so as to meet the shaft installation requirements.
[0041] Shaft-type parts (such as plain shafts and stepped shafts) are typically installed into the bearing inner ring using an interference fit or clearance fit, and the tolerances of their outer diameter and the inner diameter of the inner ring must be strictly matched. If the limiting part 4 protrudes from the inner wall surface, the shaft will mechanically interfere with the limiting part 4 during installation, making assembly difficult. The shaft cannot be pushed in smoothly, requiring additional pressure or adjustment of the position of the limiting part 4, increasing assembly time, or the edge of the limiting part 4 may scratch the shaft surface, reducing fit accuracy, or even causing stress concentration. When the surface of the limiting part 4 is lower than or flush with the inner wall surface, installation is convenient, the load on the shaft and the bearing inner ring is evenly distributed, and local stress concentration is avoided. For example, for a bearing inner ring with a diameter of 50mm, if the thickness of the limiting part 4 is 5mm, the depth of the embedding groove 3 should be ≥5mm to ensure that after installation, the surface of the limiting part 4 is 0.1-0.3mm lower than the inner wall surface (safety margin).
[0042] In a preferred embodiment of this application, the first settling tank 10 and the second settling tank 20 are arranged in a mirror-symmetric manner.
[0043] By employing a mirror-symmetric design between the first recess 10 and the second recess 20, complete consistency between the two bearing inner rings is achieved. The first bearing inner ring 1 and the second bearing inner ring 2 are identical, eliminating the need to distinguish left from right during assembly and reducing the risk of operational errors. Only one type of inner ring needs to be stocked, reducing the variety of spare parts and inventory costs. If the inner ring needs to be replaced, there is no need to distinguish its location; it can be replaced directly, shortening maintenance time.
[0044] See Figure 3 The first sink 10 and the second sink 20 are both provided with positioning grooves 30. The depth of the positioning grooves 30 is greater than that of the first sink 10 and the second sink 20. The limiting member 4 is provided with a positioning protrusion 40 corresponding to the positioning groove 30. The positioning protrusion 40 is inserted into the positioning groove 30 to prevent the axial relative displacement of the inner ring 1 of the first bearing and the inner ring 2 of the second bearing.
[0045] The positioning groove 30 is designed to be deeper than the first recess 10 and the second recess 20. When the limiting member 4 is installed in place, the positioning protrusion 40 is fully embedded in the positioning groove 30, and the top of the protrusion forms a contact surface with the bottom surface of the positioning groove 30. The remaining depth of the recess is used to accommodate the main body of the limiting member 4. Because the positioning protrusion 40 and the positioning groove 30 have a depth difference in the axial direction, the inner rings cannot move relative to each other in the axial direction, further restricting the relative displacement of the two inner rings in the axial and circumferential directions.
[0046] Furthermore, multiple embedding grooves 3 are evenly arranged along the axial direction of the first bearing inner ring 1 and the second bearing inner ring 2, and each embedding groove 3 is provided with a corresponding limiting member 4.
[0047] The embedding groove 3 is a rectangular groove, and its depth is 1 / 5 to 1 / 3 of the wall thickness of the inner ring 1 of the first bearing or the inner ring 2 of the second bearing. The depth of the embedding groove 3, being 1 / 5 to 1 / 3 of the wall thickness, ensures sufficient embedding space for the limiting member 4 while preventing a decrease in the strength of the inner ring due to excessive groove depth. The rectangular groove can be formed in one straight cut using an end mill, eliminating the need for complex toolpath planning.
[0048] In a preferred embodiment of this application, the limiting member 4 is a rectangular block or a rectangular hollow tube.
[0049] The rectangular block limiting component 4 is simple to process and has low cost. It is suitable for high load, low speed and long service life requirements (such as wind power and construction machinery). The rectangular hollow tube limiting component 4 can reduce weight while maintaining shear resistance. It is suitable for lightweight, high speed rotation and multi-functional requirements (such as CNC machine tools and precision instruments). At the same time, the rectangular hollow tube limiting component 4 can also increase the oil space, which is beneficial to improving the bearing lubrication effect.
[0050] By rationally selecting the four types of limiting components, the performance and cost-effectiveness of the bearing inner ring connection structure can be significantly improved, meeting the needs of different working conditions.
[0051] For any parts not mentioned in this utility model, existing technologies can be used or referenced.
[0052] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A connection structure for the inner rings of a double-row tapered roller bearing, comprising a first bearing inner ring and a second bearing inner ring arranged coaxially and symmetrically, characterized in that, The inner wall surface of the first bearing inner ring is provided with a first groove, and the first groove forms a first opening at the end face of the first bearing inner ring; the inner wall surface of the second bearing inner ring is provided with a second groove, and the second groove forms a second opening at the end face of the second bearing inner ring. The first opening and the second opening are axially aligned, so that the first sink and the second sink are joined together to form an embedding groove; a limiting member adapted to the shape of the groove is embedded in the embedding groove to restrict relative rotation between the inner ring of the first bearing and the inner ring of the second bearing.
2. The inner ring connection structure of the double-row tapered roller bearing according to claim 1, characterized in that, The limiting component and the insert groove are interference-fitted and detachably connected.
3. The inner ring connection structure of the double-row tapered roller bearing according to claim 1, characterized in that, After the limiting component is installed into the embedding groove, the limiting component is welded to the groove wall of the embedding groove using a welding process.
4. The inner ring connection structure of the double-row tapered roller bearing according to claim 1, characterized in that, The depth of the embedding groove is greater than or equal to the thickness of the limiting member, such that after the limiting member is installed into the embedding groove, the exposed surface of the limiting member is lower than or flush with the inner wall surfaces of the first bearing inner ring and the second bearing inner ring, so as to meet the shaft installation requirements.
5. The inner ring connection structure of the double-row tapered roller bearing according to claim 1, characterized in that, The first and second settling tanks are set up in a mirror-symmetrical configuration.
6. The inner ring connection structure of the double-row tapered roller bearing according to claim 1, characterized in that, Both the first and second sinks are provided with positioning grooves. The depth of the positioning grooves is greater than that of the first and second sinks. The limiting member is provided with a positioning protrusion corresponding to the positioning groove. The positioning protrusion is inserted into the positioning groove to prevent the inner ring of the first bearing and the inner ring of the second bearing from axial relative displacement.
7. The inner ring connection structure of the double-row tapered roller bearing according to claim 1, characterized in that, The embedding grooves are evenly arranged in multiple ways along the axial direction of the inner rings of the first and second bearings, and each embedding groove is provided with a corresponding limiting member.
8. The inner ring connection structure of the double-row tapered roller bearing according to claim 1, characterized in that, The embedding groove is a rectangular groove, and the depth of the embedding groove is 1 / 5 to 1 / 3 of the wall thickness of the inner ring of the first bearing or the inner ring of the second bearing.
9. The inner ring connection structure of the double-row tapered roller bearing according to claim 8, characterized in that, The limiting component is a rectangular block or a rectangular hollow tube.