Bearing outer ring anti-rotation device based on single anti-rotation block and clearance fit

Abstract

The utility model discloses a bearing outer ring anti-rotation device based on single anti-rotation block and clearance fit, which relates to the technical field of bearings, and comprises a bearing, a first anti-rotation groove is axially formed in the surface of the outer ring of the bearing; a second anti-rotation groove is formed in the position, corresponding to the first anti-rotation groove, of the inner wall of the bearing seat; the section size of the anti-rotation block is smaller than the width of the first anti-rotation groove and the width of the second anti-rotation groove, and the anti-rotation block is embedded into the first anti-rotation groove and the second anti-rotation groove and is in clearance fit with the bearing outer ring; the gland is mounted at the end part of the bearing seat so as to press the bearing inner ring; a uniform radial gap is reserved between the bearing outer ring and the bearing seat, and free thermal expansion of the outer ring is allowed; the anti-rotation block is arranged in a non-bearing area or a middle area of the bearing outer ring so as to avoid interference of a main load transmission path. Reliable circumferential positioning can be achieved, the thermal expansion compensation requirement can be met, meanwhile, load transmission is optimized, and the structure simplification and working condition adaptability are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and more specifically to a bearing outer ring anti-rotation device based on a single anti-rotation block and clearance fit. Background Technology

[0002] As a key component of mechanical transmission systems, the performance of bearing anti-rotation structures directly affects the rotational accuracy and operational reliability of equipment. Currently, traditional bearing anti-rotation structures, such as keyway fits, interference fits, and multi-point anti-rotation blocks, face significant technical bottlenecks in practical applications.

[0003] In terms of thermal management, interference fits or rigid anti-rotation designs are ill-suited to the radial thermal expansion of bearings under high-speed operation or temperature difference conditions. Rigid constraints lead to stress concentration between the bearing housing and the outer ring, accelerating material fatigue and easily causing bearing seizure failure, a problem particularly prominent in high-temperature differential equipment such as wind power and metallurgy. Regarding structural reliability, keyway anti-rotation structures require precision machining, resulting in high costs, and stress concentration at the root of the keyway easily weakens the bearing housing strength. While multi-point anti-rotation blocks can distribute the load, accumulated errors at the mating surfaces affect assembly accuracy, and the complex structure also increases maintenance difficulty. In terms of load transfer, existing anti-rotation devices are often placed near the bearing's load-bearing area, interfering with the main load transfer path, causing uneven local stress distribution in the bearing, especially under large tilt angle load conditions, severely reducing the bearing's dynamic load-bearing capacity. Furthermore, traditional pressure-type axial locking structures, by increasing the clamping force to limit outer ring displacement, excessively constrain the radial expansion of the outer ring, creating axial and radial coupling constraints, exacerbating uneven internal stress within the bearing. These technical bottlenecks urgently need to be addressed to improve the overall performance of bearings. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems by providing a bearing outer ring anti-rotation device based on a single anti-rotation block and clearance fit.

[0005] The technical solution adopted in this utility model is as follows: A bearing outer ring anti-rotation device based on a single anti-rotation block and clearance fit, comprising:

[0006] The bearing has a first anti-rotation groove on its outer ring surface along the axial direction;

[0007] The bearing housing has a second anti-rotation groove on its inner wall corresponding to the position of the first anti-rotation groove.

[0008] The anti-rotation block has a cross-sectional dimension smaller than the width of the first anti-rotation groove and the second anti-rotation groove, and is embedded in the first anti-rotation groove and the second anti-rotation groove, and is clearance-fitted with the outer ring of the bearing.

[0009] A pressure cap is installed at the end of the bearing housing to press the inner ring of the bearing;

[0010] A uniform radial clearance is reserved between the outer ring of the bearing and the bearing housing to allow the outer ring to expand freely due to thermal expansion.

[0011] The anti-rotation block is arranged in the non-load-bearing area or the middle area of ​​the outer ring of the bearing to avoid interference with the main load transmission path.

[0012] The clearance fit design of the anti-rotation block and the double anti-rotation groove effectively restricts the circumferential rotation of the bearing outer ring while allowing it to expand radially freely. The design of arranging the anti-rotation block in the non-load-bearing area avoids stress concentration on the main load path, ensuring the load-bearing capacity of the bearing system. The uniform radial clearance design can evenly distribute thermal expansion stress and prevent local deformation.

[0013] Preferably, the radial clearance between the bearing outer ring and the bearing housing is 0.5 mm.

[0014] Preferably, the anti-rotation block and the first and second anti-rotation grooves are in a micro-clear fit, with a clearance value ranging from 0.02 to 0.05 mm, which is used to limit the circumferential rotation of the outer ring of the bearing.

[0015] Preferably, the first anti-rotation groove and the second anti-rotation groove are symmetrically opened along the same axial position of the bearing outer ring and the bearing housing, and the groove depth is 1 / 3 to 1 / 2 of the thickness of the bearing outer ring.

[0016] Preferably, the gland is fixed to the end of the bearing housing by bolts and the inner ring of the bearing is pressed by an elastic washer to compensate for assembly tolerances.

[0017] Preferably, the anti-rotation block has a trapezoidal cross-section, and its inclined surface forms a self-locking structure with the side wall of the anti-rotation groove to prevent the anti-rotation block from falling off under vibration conditions.

[0018] Preferably, the surface of the anti-rotation block is provided with a friction-reducing coating, and the coating material is polytetrafluoroethylene or molybdenum disulfide.

[0019] Preferably, the bottom of the second anti-rotation groove on the inner wall of the bearing housing is provided with an elastic buffer layer made of silicone rubber or polyurethane, which is used to absorb micro-displacement caused by thermal expansion.

[0020] Preferably, two bearings are symmetrically arranged along the axial direction, and the first anti-rotation grooves of the outer rings of the two bearings are connected in series by the same anti-rotation block to form an integral anti-rotation structure.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0022] 1. By using the clearance fit between the first / second anti-rotation groove and the anti-rotation block, rigid constraint on the circumferential rotation of the bearing outer ring is achieved, while radial thermal expansion space is retained, thus solving the problems of stress concentration and thermal deformation damage caused by traditional interference fit.

[0023] 2. The 0.5mm radial clearance design precisely balances thermal expansion requirements and assembly accuracy, ensuring that the bearing can expand freely under operating conditions from -40℃ to 120℃, avoiding jamming.

[0024] 3. The micro-clear fit adopts a precision tolerance of 0.02-0.05mm, which not only ensures the convenience of assembly, but also effectively limits the maximum rotational displacement to no more than 0.1°, meeting the positioning requirements of high-precision transmission systems.

[0025] 4. The symmetrical groove depth design makes the anti-rotation structure strength reach 60%-75% of the outer ring body strength, ensuring structural rigidity while avoiding weakening the bearing load capacity.

[0026] 5. The elastic gasket clamping structure can absorb axial assembly errors of ±0.2mm, and the bolt preload deviation is controlled within 15%, which significantly improves the stability of the assembly process.

[0027] 6. The trapezoidal self-locking structure ensures that the anti-rotation block maintains a reliable connection even under 10g vibration acceleration, and the friction-reducing coating further reduces the coefficient of friction and extends service life.

[0028] 7. The elastic buffer layer can absorb 0.1-0.3mm of thermal displacement, reducing the peak contact stress, and is especially suitable for high-frequency impact load conditions.

[0029] 8. The dual-bearing tandem structure increases the critical instability speed of the system, improves the uniformity of axial load distribution, and significantly enhances the reliability of the overall support system.

[0030] In summary, this utility model comprehensively utilizes innovative designs from multiple dimensions, including mechanical anti-rotation, thermal compensation, and vibration suppression, and has significant application value in fields such as aerospace and precision machine tools. Attached Figure Description

[0031] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;

[0034] Figure 3 This is a schematic diagram of the structure of the bearing with anti-rotation block installed according to this utility model;

[0035] Figure 4 This is a schematic diagram of the bearing assembly structure of this utility model;

[0036] Figure 5 This is a schematic diagram of a single bearing structure of this utility model;

[0037] Figure 6 This is a schematic diagram of the structure of a single bearing of this utility model from another perspective;

[0038] Figure 7 This is a schematic diagram of the bearing housing structure of this utility model;

[0039] Figure 8 This is a schematic diagram of the cap structure of this utility model;

[0040] Figure 9 This is a schematic diagram of the half-section structure of this utility model;

[0041] The markings in the diagram are: 1-bearing, 2-bearing housing, 3-anti-rotation block, 4-pressure cover, 5-first anti-rotation groove, 6-second anti-rotation groove. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] In one embodiment of this utility model, such as Figure 1-9 As shown, this embodiment provides a bearing outer ring anti-rotation device based on a single anti-rotation block and clearance fit, comprising:

[0045] Bearing 1, with a first anti-rotation groove 5 formed on the outer ring surface along the axial direction;

[0046] The bearing housing 2 has a second anti-rotation groove 6 formed on its inner wall corresponding to the position of the first anti-rotation groove 5;

[0047] The anti-rotation block 3 has a cross-sectional dimension smaller than the width of the first anti-rotation groove 5 and the second anti-rotation groove 6, and is embedded in the first anti-rotation groove 5 and the second anti-rotation groove 6, and is clearance-fitted with the outer ring of the bearing 1.

[0048] Pressure cap 4 is installed at the end of bearing housing 2 to press the inner ring of bearing 1;

[0049] A uniform radial gap is reserved between the outer ring of the bearing 1 and the bearing housing 2 to allow the outer ring to expand freely due to thermal expansion.

[0050] The anti-rotation block 3 is arranged in the non-load-bearing area or the middle area of ​​the outer ring of the bearing 1 to avoid interference with the main load transmission path.

[0051] The clearance fit design of the anti-rotation block 3 and the double anti-rotation groove allows the outer ring of bearing 1 to expand radially freely while effectively restricting its circumferential rotation; the design of arranging the anti-rotation block 3 in the non-load-bearing area avoids stress concentration in the main load path and ensures the load-bearing capacity of the bearing 1 system; the uniform radial clearance design can evenly distribute thermal expansion stress and prevent local deformation.

[0052] In another embodiment of this utility model, the radial clearance between the outer ring of the bearing 1 and the bearing housing 2 is 0.5 mm. The 0.5 mm radial clearance is optimized to meet the thermal expansion requirements under normal operating conditions, ensure the free movement space of the outer ring of the bearing 1 during thermal expansion, and maintain sufficient positioning accuracy.

[0053] In another embodiment of this utility model, the anti-rotation block 3 and the first anti-rotation groove 5 and the second anti-rotation groove 6 are in a micro-clearance fit, with a clearance value ranging from 0.02 to 0.05 mm, which is used to restrict the circumferential rotation of the outer ring of the bearing 1. The 0.02-0.05 mm micro-clearance fit allows for slight displacement compensation while ensuring assembly accuracy; precise control of the fit clearance between the anti-rotation block 3 and the groove achieves a balance between rotational constraint and thermal expansion compensation.

[0054] In another embodiment of this utility model, the first anti-rotation groove 5 and the second anti-rotation groove 6 are symmetrically opened along the same axial position of the outer ring of the bearing 1 and the bearing housing 2, and the groove depth is 1 / 3 to 1 / 2 of the thickness of the outer ring of the bearing 1. The symmetrical groove structure ensures the symmetry of stress distribution and avoids off-center loading; the 1 / 3 to 1 / 2 groove depth design provides sufficient torque transmission capacity while ensuring structural strength.

[0055] In another embodiment of this utility model, the pressure cap 4 is fixed to the end of the bearing housing 2 by bolts, and the inner ring of the bearing 1 is pressed by an elastic washer to compensate for assembly tolerances. The elastic washer design enables dynamic preload adjustment and compensates for axial dimensional chain tolerances; the bolt connection method facilitates assembly and maintenance and ensures the controllability of the clamping force.

[0056] In another embodiment of this utility model, the anti-rotation block 3 has a trapezoidal cross-section, and its inclined surface forms a self-locking structure with the side wall of the anti-rotation groove to prevent the anti-rotation block 3 from falling off under vibration conditions. The trapezoidal cross-section self-locking structure significantly improves the vibration resistance of the anti-rotation block 3; the inclined surface contact design can automatically compensate for wear gaps and maintain long-term working reliability.

[0057] In another embodiment of this utility model, the surface of the anti-rotation block 3 is provided with a friction-reducing coating, and the coating material is polytetrafluoroethylene or molybdenum disulfide. The friction-reducing coating reduces the coefficient of sliding friction and reduces wear; the special coating material selection takes into account both wear resistance and high temperature stability (PTFE temperature resistance -180~260℃, MoS2 temperature resistance up to 400℃).

[0058] In another embodiment of this utility model, the bottom of the second anti-rotation groove 6 on the inner wall of the bearing seat 2 is provided with an elastic buffer layer made of silicone rubber or polyurethane, which is used to absorb micro-displacement caused by thermal expansion. The elastic buffer layer can absorb part of the impact energy and reduce the stress peak; the polymer elastomer material has both damping characteristics and aging resistance, increasing the service life by 3-5 times.

[0059] In another embodiment of this utility model, two bearings 1 are symmetrically arranged along the axial direction. The first anti-rotation grooves 5 of the outer rings of the two bearings 1 are limited in series by the same anti-rotation block 3 to form an integral anti-rotation structure. The series structure of the two bearings 1 achieves synchronous anti-rotation control and improves the rigidity of the system; the design of the shared anti-rotation block 3 simplifies the assembly process and reduces the number of parts; the symmetrical arrangement effectively balances the axial load and prevents early failure caused by off-center loading.

[0060] The installation method of this utility model includes the following steps:

[0061] Gently push bearing 1 into bearing housing 2 to ensure that the radial clearance between the outer ring of bearing 1 and bearing housing 2 is evenly distributed.

[0062] Adjust the position of the first anti-rotation groove 5 on the outer ring of bearing 1 to coincide with the position of the second anti-rotation groove 6 on bearing housing 2;

[0063] Insert the anti-rotation block 3 axially into the first anti-rotation groove 5 and the second anti-rotation groove 6 of the outer ring of the bearing 1 and the bearing housing 2; then gently push the other bearing 1 into the bearing housing 2 to ensure that the first anti-rotation groove 5 of the outer ring of the bearing 1 is engaged with the anti-rotation block 3. Finally, install the pressure cap 4 and press the inner ring of the bearing 1, and fix it with bolts to complete the assembly.

[0064] The working principle of this utility model is as follows:

[0065] 1. The core anti-rotation mechanism is based on a double-groove interlocking structure. The anti-rotation block 3 is simultaneously embedded in the first anti-rotation groove 5 of the outer ring of the bearing 1 and the second anti-rotation groove 6 of the bearing seat 2, forming a three-point positioning constraint; the 0.02-0.05mm micro-clear gap fit achieves "rigid-flexible coupling": allowing a radial displacement tolerance of 0.5mm, but controlling the circumferential rotation within ±0.5°; the trapezoidal cross-section anti-rotation block 3 forms a 7°-12° inclined self-locking angle with the groove sidewall, which enhances the torsional stiffness through the wedge effect;

[0066] 2. Thermal expansion compensation system with dual degrees of freedom design: The inner ring is rigidly fixed axially by the pressure cap 4, and the outer ring maintains a uniform gap of 0.5mm with the bearing seat 2 radially; the elastic buffer layer (silicone rubber / polyurethane) forms a flexible interface at the bottom of the second anti-rotation groove 6, which can absorb ±0.3mm thermal displacement; the non-load-bearing area arrangement strategy makes the anti-rotation block 3 bear only 0.2-0.5MPa contact stress, avoiding stress superposition in the main load area;

[0067] 3. Enhanced dynamic stability: The friction-reducing coating (PTFE / MoS2) reduces the coefficient of friction to 0.08-0.12, reducing fretting wear by 30%; the elastic gasket provides 15-25 N·m of preload compensation, ensuring stable clamping within an axial tolerance of ±0.1 mm; the anti-rotation block 3 in the dual bearing 1 series structure forms a bridging beam effect, improving the torsional stiffness of the system.

[0068] 4. Failure prevention mechanism: The groove depth is controlled at 1 / 3-1 / 2 (about 3-5mm) of the outer ring thickness to ensure structural integrity while reserving a safety margin. The self-locking structure can withstand 5g vibration acceleration, and the anti-loosening ability is 3 times higher than that of traditional keyways. The radial clearance design reduces thermal stress and avoids the propagation of microcracks caused by interference fit.

[0069] This device achieves precise anti-rotation while maintaining the bearing's 1 degree of freedom through a rigid-flexible coupling constraint strategy. Its multi-level compensation system enables axial positioning accuracy to reach ±0.05mm and radial thermal displacement tolerance to be ±0.4mm, making it particularly suitable for heavy-load rotational conditions with temperature differences exceeding 80℃.

Claims

1. A bearing outer ring anti-rotation device based on a single anti-rotation block and clearance fit, characterized in that, include: The bearing (1) has a first anti-rotation groove (5) opened on the outer ring surface along the axial direction; The bearing housing (2) has a second anti-rotation groove (6) on its inner wall corresponding to the position of the first anti-rotation groove (5); The anti-rotation block (3) has a cross-sectional dimension smaller than the width of the first anti-rotation groove (5) and the second anti-rotation groove (6), and is embedded in the first anti-rotation groove (5) and the second anti-rotation groove (6), and is clearance-fitted with the outer ring of the bearing (1); A pressure cap (4) is installed at the end of the bearing housing (2) to press the inner ring of the bearing (1); A uniform radial gap is reserved between the outer ring of the bearing (1) and the bearing housing (2) to allow the outer ring to expand freely due to thermal expansion. The anti-rotation block (3) is arranged in the non-load-bearing area or the middle area of ​​the outer ring of the bearing (1) to avoid interference with the main load transmission path.

2. The anti-rotation device for the outer ring of the bearing (1) according to claim 1, characterized in that, The radial clearance between the outer ring of the bearing (1) and the bearing housing (2) is 0.5 mm.

3. The anti-rotation device for the outer ring of the bearing (1) according to claim 2, characterized in that, The anti-rotation block (3) is in a micro-clear fit with the first anti-rotation groove (5) and the second anti-rotation groove (6), with a clearance value ranging from 0.02 to 0.05 mm, which is used to limit the circumferential rotation of the outer ring of the bearing (1).

4. The anti-rotation device for the outer ring of the bearing (1) according to claim 3, characterized in that, The first anti-rotation groove (5) and the second anti-rotation groove (6) are symmetrically opened along the same axial position of the outer ring of the bearing (1) and the bearing housing (2), and the groove depth is 1 / 3-1 / 2 of the thickness of the outer ring of the bearing (1).

5. The anti-rotation device for the outer ring of the bearing (1) according to claim 1, characterized in that, The pressure cap (4) is fixed to the end of the bearing seat (2) by bolts and presses the inner ring of the bearing (1) by elastic gaskets to compensate for assembly tolerances.

6. The anti-rotation device for the outer ring of the bearing (1) according to claim 1, characterized in that, The anti-rotation block (3) has a trapezoidal cross section, and its inclined surface forms a self-locking structure with the side wall of the anti-rotation groove to prevent the anti-rotation block (3) from falling off under vibration conditions.

7. The anti-rotation device for the outer ring of the bearing (1) according to claim 6, characterized in that, The surface of the anti-rotation block (3) is provided with a friction-reducing coating, and the coating material is polytetrafluoroethylene or molybdenum disulfide.

8. The anti-rotation device for the outer ring of the bearing (1) according to claim 1, characterized in that, The bottom of the second anti-rotation groove (6) on the inner wall of the bearing housing (2) is provided with an elastic buffer layer made of silicone rubber or polyurethane, which is used to absorb micro-displacement caused by thermal expansion.

9. The anti-rotation device for the outer ring of the bearing (1) according to claim 1, characterized in that, Two bearings (1) are symmetrically arranged along the axial direction. The first anti-rotation groove (5) of the outer ring of the two bearings (1) is connected in series and limited by the same anti-rotation block (3) to form an integral anti-rotation structure.

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