A high load bearing radial connection structure for releasing large impact torque

Abstract

The application discloses a high-load-bearing bearing radial connection structure for releasing large impact torque, and belongs to the technical field of bearing connection, which comprises an inner supporting fixed ring, an outer supporting movable ring, a bearing, an inner stop ring and an outer stop ring. A large interference fit is adopted between a bearing outer sleeve ring and the outer supporting movable ring to form a rigid connection surface, and a small interference fit is adopted between a bearing inner sleeve ring and the inner supporting fixed ring to form a flexible connection surface. The total interference amount reduces the initial play of the bearing to the working play, so that reliable load transmission under normal working conditions is ensured. When the impact torque exceeds the friction torque of the flexible connection surface under the jamming working condition, relative sliding is generated between the inner sleeve ring and the inner supporting fixed ring, the rolling bearing is converted into a sliding bearing, the emergency stop time is delayed, the impact torque peak value is reduced, and structural damage is avoided.

Description

Technical Field

[0001] This invention relates to the field of bearing connection technology, and in particular to a radial connection structure for high-load bearings used to release large impact torque. Background Technology

[0002] Large bearings are widely used in rotating support applications with large inertia loads, such as radar antenna mounts and heavy-duty rotating platforms. To ensure the bearing's load-bearing capacity, existing technologies typically use bolts to rigidly connect the inner and outer rings of the bearing to the support structure, respectively.

[0003] However, rigid connections pose serious safety hazards under high inertia loads. When a bearing jams during operation, the instantaneous high impact torque generated by sudden braking of a high inertia load cannot be released and is directly transmitted to the bearing and platform foundation through the rigid connection. Since the peak value of the impact torque far exceeds the normal load-bearing capacity of the bearing and platform foundation, it can easily cause serious safety accidents such as bearing damage, bolt breakage, platform foundation deformation, or even overall structural failure.

[0004] Therefore, how to effectively release the large impact torque under jamming conditions while ensuring reliable load transmission under normal bearing operating conditions is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the problem of structural damage caused by the direct transmission of impact torque in rigid connections of large bearings under jamming conditions, this invention provides a radial connection structure for high-load bearings to release large impact torque.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A radial connection structure for a high-load bearing used to release large impact torque includes an inner supporting fixed ring, an outer supporting rotating ring, a bearing, an inner stop ring, and an outer stop ring. The bearing includes an inner ring, an outer ring, and rolling elements disposed between the inner and outer rings. The inner supporting fixed ring is connected to the inner ring of the bearing, and the outer supporting rotating ring is connected to the outer ring of the bearing. The inner and outer stop rings respectively constrain the axial degrees of freedom of the bearing. The bearing has initial clearance. A large interference fit is used between the outer ring of the bearing and the outer supporting rotating ring. A rigid connection surface is formed; a small interference fit is adopted between the inner bearing ring and the inner support ring to form a flexible connection surface; the interference amount of the large interference fit is greater than that of the small interference fit; the initial clearance is reduced to the working clearance by the total interference of the large and small interference fits, so as to ensure reliable load transmission of the bearing under normal working conditions, and under jamming conditions, the flexible connection surface allows relative sliding between the inner bearing ring and the inner support ring, transforming the rolling bearing into a sliding bearing to release the impact torque.

[0007] Furthermore, the interference of the large interference fit is greater than that of the small interference fit, so that the outer ring and the outer support moving ring form an integrated load-bearing structure, and the inner ring and the inner support fixed ring form a slidable flexible connection.

[0008] Furthermore, the anti-slip frictional torque generated by the minimum interference of the flexible connection surface is greater than the maximum frictional torque when the bearing is working normally, so as to ensure that there is no relative sliding between the inner ring of the bearing and the inner support ring under normal working conditions.

[0009] Furthermore, the frictional torque generated by the maximum interference of the flexible connection surface is less than the maximum torsional torque that the platform can withstand, so as to ensure that relative sliding can occur between the inner bearing ring and the inner support ring under jamming conditions.

[0010] Furthermore, the inner stop ring and the outer stop ring are each formed by splicing together several segmented pressure plates to form a complete circular structure.

[0011] Furthermore, the inner support fixed ring and the outer support moving ring are respectively provided with U-shaped annular grooves, and the inner stop ring and the outer stop ring are respectively installed in the corresponding U-shaped annular grooves to constrain the axial degree of freedom of the bearing.

[0012] Furthermore, the inner support fixed ring is a closed hollow ring structure, and the outer support moving ring is a closed hollow ring structure.

[0013] Furthermore, the bottom of the inner support fixed ring is provided with a flange, which is used to connect to the platform foundation with bolts; the top of the outer support moving ring is provided with a flange, which is used to connect to a large inertia load.

[0014] Furthermore, the assembly of the inner bearing ring and the inner support ring adopts a cold assembly process, in which the inner support ring is cooled to a low temperature to shrink the inner hole before being installed into the inner bearing ring; the assembly of the outer bearing ring and the outer support ring adopts a hot assembly process, in which the outer support ring is heated to expand the inner hole before being fitted onto the outer bearing ring.

[0015] Furthermore, the initial clearance is 0.14-0.16 mm, and the working clearance is 0.03-0.05 mm; the large interference fit between the outer bearing ring and the outer support ring is 0.28-0.30 mm, and the small interference fit between the inner bearing ring and the inner support ring is 0.04-0.06 mm.

[0016] The beneficial effects of this invention are: 1. This invention employs a differentiated interference fit design, using a large interference fit between the outer ring of the bearing and the outer support ring to form a rigid connection surface, ensuring load-bearing capacity; and using a small interference fit between the inner ring of the bearing and the inner support ring to form a flexible connection surface, ensuring reliable load transmission under normal operating conditions, and allowing relative sliding under jamming conditions, thus transforming the rolling bearing into a sliding bearing, delaying emergency stop time, effectively reducing the peak impact torque, and avoiding structural damage.

[0017] 2. This invention reduces the initial clearance to a working clearance that meets operational requirements by accurately calculating the interference amount. At the same time, it rationally distributes the interference amount, with the outer part being larger and the inner part smaller, so as to achieve the function of releasing impact torque while ensuring the bearing's operating clearance under normal working conditions.

[0018] 3. The interference fit design of the flexible connection surface of the present invention has clear upper and lower limit constraints: the minimum value ensures that there is no slippage under normal working conditions, and the maximum value ensures that it can slide under stuck working conditions, so that the connection structure achieves the optimal balance between normal load transmission and impact release.

[0019] 4. The present invention adopts a segmented stop ring structure and a U-shaped annular groove, which not only ensures the constraint of the axial degree of freedom of the bearing, but also facilitates installation and disassembly. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the radial interference fit structure of the bearing of the present invention; Figure 2 This is a schematic diagram of the inner and outer stop rings of the present invention; Figure 3 This is a three-dimensional schematic diagram of the present invention.

[0021] The labels in the diagram are as follows: 1—Inner support fixed ring, 2—Outer support moving ring, 3—Bearing, 4—Inner stop ring, 5—Outer stop ring, 6—Flexible connection surface. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 and Figure 2 As shown, a high-load bearing radial connection structure for releasing large impact torque in this embodiment includes an inner support fixed ring 1, an outer support moving ring 2, a bearing 3, an inner stop ring 4, and an outer stop ring 5.

[0024] Bearing 3 includes an inner ring, an outer ring, and steel balls (rolling elements) disposed between the inner and outer rings. In this embodiment, bearing 3 is a large thin-walled four-point contact ball bearing with specifications of Φ1800×Φ1550×120mm.

[0025] The inner support fixed ring 1 is a closed hollow circular ring structure with dimensions of Φ1600×Φ1000×220mm. It has a flange at its bottom, which is bolted to the platform foundation, thus fixing the inner support fixed ring 1 to the platform foundation. The outer support moving ring 2 is a closed hollow circular ring structure with dimensions of Φ2180×Φ1800×240mm. It has a flange at its top, which is bolted to the large inertia load, allowing the outer support moving ring 2 to rotate together with the large inertia load. In this embodiment, the weight of the large inertia load is m=20000kg, the moment of inertia is J=1000730kg·m², and the maximum rotational speed is 25r / min.

[0026] The core innovation of this invention lies in the use of differentiated interference fit between the inner and outer rings of the bearing 3 and the support ring.

[0027] The outer ring of bearing 3 and the outer support ring 2 are fitted with a large interference fit, with an interference of 0.28-0.30mm, forming a rigid connection surface. The large interference fit ensures that the outer ring and the outer support ring 2 fit tightly together, forming an integrated load-bearing structure. This ensures that no relative slippage occurs between the outer ring and the outer support ring 2 under both normal and abnormal operating conditions, reliably transmitting the load.

[0028] The inner ring of bearing 3 and the inner support ring 1 are fitted with a small interference fit, with an interference of 0.04-0.06 mm, forming a flexible connection surface 6. Under normal operating conditions, the frictional torque generated by the small interference fit is sufficient to overcome the frictional force during normal bearing operation, ensuring that there is no relative sliding between the inner ring and the inner support ring 1; however, under jamming conditions, when the large impact torque exceeds the frictional torque of the flexible connection surface 6, relative sliding can occur between the inner ring and the inner support ring 1.

[0029] Bearing 3 has a relatively large initial clearance, which is 0.14-0.16 mm in this embodiment. The total interference of the large and small interference fits (outer ring expansion + inner ring contraction) reduces the initial clearance to a working clearance of 0.03-0.05 mm, meeting the requirements for normal operation and load bearing.

[0030] The interference fit design of the flexible connection surface 6 follows these principles: (1) The anti-slip friction torque generated by the minimum interference fit must be greater than the maximum friction torque when the bearing is working normally, so as to ensure that there is no relative slippage between the inner ring and the inner support ring 1 under normal working conditions, and to achieve reliable load transmission. (2) The frictional torque generated by the maximum interference must be less than the maximum torsional torque that the platform can withstand, so as to ensure that when the impact torque exceeds the frictional torque of the flexible connection surface 6 under jamming conditions, the inner ring and the inner support ring 1 can slide relative to each other and release the impact torque.

[0031] The inner stop ring 4 and outer stop ring 5 are each formed into a complete circular structure by splicing multiple segmented pressure plates. The inner support fixed ring 1 and the outer support moving ring 2 are each provided with a U-shaped annular groove. The inner stop ring 4 is installed into the U-shaped annular groove on the inner support fixed ring 1, and the outer stop ring 5 is installed into the U-shaped annular groove on the outer support moving ring 2, respectively constraining the axial degree of freedom of the bearing 3. The segmented stop ring structure facilitates installation and disassembly, while the fit between the U-shaped annular groove and the stop ring ensures the reliability of the axial constraint without affecting the radial interference fit.

[0032] The assembly process of this invention is as follows: Step 1: Cold installation of the inner ring. Cool the inner support ring 1 to -50℃ and hold for 20 minutes to shrink its inner bore. Then, install the inner ring of bearing 3 into the inner bore of the inner support ring 1. After reheating, the inner support ring 1 returns to its original size, forming a small interference fit of 0.04-0.06mm with the inner ring.

[0033] Step 2: Heat fitting the outer ring. Heat the outer support moving ring 2 to 65℃ and hold for 50 minutes to expand its inner bore. Then, fit it onto the outer ring of bearing 3. After cooling, the outer support moving ring 2 returns to its original size, forming a large interference fit of 0.28-0.30mm with the outer ring.

[0034] Step 3: Install the stop rings. Insert the segmented pressure plates into the U-shaped annular grooves in sequence to form the complete inner stop ring 4 and outer stop ring 5, thus constraining the axial freedom of the bearing 3.

[0035] The working principle of this invention is as follows: Under normal operating conditions: Bearing 3 operates normally. The frictional torque generated by the flexible connection surface 6 (the interference fit surface between the inner ring and the inner support ring 1) is greater than the maximum frictional torque during normal bearing operation. No relative sliding occurs between the inner ring and the inner support ring 1. The inner and outer rings of bearing 3 are reliably connected to the inner support ring 1 and the outer support ring 2, respectively, and the load is reliably transmitted through bearing 3. Simultaneously, the total interference fit reduces the initial clearance of 0.14-0.16 mm to the operating clearance of 0.03-0.05 mm, meeting the requirements for normal bearing operation.

[0036] Under jamming conditions: When bearing 3 experiences operational jamming, the instantaneous large impact torque generated by the sudden braking of a large inertia load (weight 20000kg, inertia 1000730kg·m²) acts on bearing 3. Due to the large interference fit between the outer ring and the outer support ring 2 forming a rigid connection surface, the impact torque cannot be released at this connection surface; while the small interference fit between the inner ring and the inner support ring 1 forming a flexible connection surface 6, when the impact torque exceeds the frictional torque of the flexible connection surface 6, relative sliding occurs between the inner ring and the inner support ring 1, and the rolling friction of bearing 3 is converted into sliding friction, which is equivalent to converting the rolling bearing into a sliding bearing. The coefficient of friction of sliding friction is much greater than that of rolling friction, which effectively delays the sudden stop time of the large inertia load, reduces the peak value of the impact torque, and protects the bearing and platform foundation from damage.

[0037] This invention achieves the dual functions of reliable load transfer under normal operating conditions and impact release under abnormal operating conditions through precise design of differentiated interference fit. It solves the technical problem of structural damage caused by direct transmission of impact torque under jamming conditions in rigid connections in the prior art, and significantly improves the safety and reliability of large bearing connection structures.

Claims

1. A radial connection structure for a high-load bearing used to release large impact torque, comprising an inner supporting fixed ring, an outer supporting moving ring, a bearing, an inner stop ring, and an outer stop ring, wherein the bearing comprises an inner ring, an outer ring, and rolling elements disposed between the inner and outer rings, the inner supporting fixed ring is connected to the inner ring of the bearing, the outer supporting moving ring is connected to the outer ring of the bearing, and the inner and outer stop rings are respectively used to constrain the axial degree of freedom of the bearing, characterized in that: The bearing has an initial clearance; the outer ring of the bearing and the outer supporting moving ring are fitted with a large interference fit to form a rigid connection surface; the inner ring of the bearing and the inner supporting stationary ring are fitted with a small interference fit to form a flexible connection surface; the interference amount of the large interference fit is greater than the interference amount of the small interference fit; the total interference of the large and small interference fits reduces the initial clearance to the working clearance, so as to ensure reliable load transmission of the bearing under normal operating conditions, and under jamming conditions, the flexible connection surface allows relative sliding between the inner ring of the bearing and the inner supporting stationary ring, transforming the rolling bearing into a sliding bearing to release impact torque.

2. The high-load bearing radial connection structure for releasing large impact torque according to claim 1, characterized in that: The interference of the large interference fit is greater than that of the small interference fit, so that the outer ring and the outer support moving ring form an integrated load-bearing structure, and the inner ring and the inner support fixed ring form a slidable flexible connection.

3. The high-load bearing radial connection structure for releasing large impact torque according to claim 1, characterized in that: The anti-slip friction torque generated by the minimum interference of the flexible connection surface is greater than the maximum friction torque when the bearing is working normally, so as to ensure that there is no relative sliding between the inner ring of the bearing and the inner support ring under normal working conditions.

4. The high-load bearing radial connection structure for releasing large impact torque according to claim 1, characterized in that: The frictional torque generated by the maximum interference of the flexible connection surface is less than the maximum torsional torque that the platform can withstand, so as to ensure that relative sliding can occur between the inner bearing ring and the inner support ring under jamming conditions.

5. The high-load bearing radial connection structure for releasing large impact torque according to claim 1, characterized in that: The inner stop ring and the outer stop ring are each formed by splicing together several segmented pressure plates to form a complete circular structure.

6. The high-load bearing radial connection structure for releasing large impact torque according to claim 1, characterized in that: The inner support fixed ring and the outer support moving ring are respectively provided with U-shaped annular grooves, and the inner stop ring and the outer stop ring are respectively installed in the corresponding U-shaped annular grooves to constrain the axial degree of freedom of the bearing.

7. The high-load bearing radial connection structure for releasing large impact torque according to claim 1, characterized in that: The inner support fixed ring is a closed hollow ring structure, and the outer support moving ring is a closed hollow ring structure.

8. The high-load bearing radial connection structure for releasing large impact torque according to claim 1, characterized in that: The inner bearing ring and the inner support ring are assembled using a cold fitting process, in which the inner support ring is cooled to a low temperature to shrink its inner hole before being installed into the inner bearing ring; the outer bearing ring and the outer support ring are assembled using a hot fitting process, in which the outer support ring is heated to expand its inner hole before being fitted onto the outer bearing ring.

9. The high-load bearing radial connection structure for releasing large impact torque according to claim 1, characterized in that: The initial clearance is 0.14-0.16 mm, and the working clearance is 0.03-0.05 mm; the large interference fit between the outer bearing ring and the outer support ring is 0.28-0.30 mm, and the small interference fit between the inner bearing ring and the inner support ring is 0.04-0.06 mm.

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