A special-shaped bearing structure

Abstract

The application belongs to the field of engine bearing design, and particularly relates to a special-shaped bearing structure, which comprises a bearing outer ring, an inner ring integrated shaft, rolling elements and a bearing retainer; the bearing outer ring, the inner ring integrated shaft and the rolling elements are coaxially arranged, and the rolling elements are arranged between the bearing outer ring and the inner ring integrated shaft; the bearing retainer is connected to the rolling elements, and the inner ring integrated shaft can be integrally connected with a corresponding engine shaft. The special-shaped structure of the integrated inner ring and shaft enables a large-size gear shaft to be adapted to a small-specification bearing for support, directly reduces the DN value of the bearing, greatly reduces the heat generation of the bearing during high-speed rotation, effectively avoids the bearing damage problem caused by excessively high temperature rise, and simultaneously eliminates the need for designing a complex bearing oil supply cooling system, thereby simplifying the overall matching design of the equipment and the difficulty of later maintenance.

Description

Technical Field

[0001] This application belongs to the field of engine bearing design, and specifically relates to an irregular bearing structure. Background Technology

[0002] For aero-engines or certain large testing equipment, considering heavy-load operating conditions and ensuring the equipment's fatigue strength meets requirements, larger gear shafts are needed. This necessitates larger bearing selection, and the high speed of the main shaft rotor results in a large bearing DN value, leading to significant heat generation and potentially excessive temperature rise. The bearing lubrication system also becomes more complex, potentially causing bearing damage. Furthermore, to prevent bearing inner ring slippage and fretting wear, conventional bearing assembly often uses a large interference fit. To ensure sufficient operating clearance, the initial bearing clearance must be designed to be large. This can lead to low bearing rotational accuracy, increased vibration and noise, and significantly reduced bearing life under certain light-load conditions. Additionally, large interference fits are difficult to assemble.

[0003] Existing bearings have the following disadvantages:

[0004] 1. Most existing support structures use bearing inner rings mounted on gear shafts. If a thicker gear shaft is selected, the corresponding bearing will naturally be larger. Under high-speed rotation conditions, the bearing DN value will be large, resulting in a large amount of heat generation.

[0005] 2. In conventional bearing assembly, to prevent the bearing inner ring from slipping off and fretting wear, the bearing inner ring is often installed with a large interference fit. In order to ensure the working clearance, the initial clearance of the bearing must be designed to be large. This will result in the bearing having low rotational accuracy, large vibration and noise, and a significantly reduced bearing service life under certain light load conditions.

[0006] 3. Conventional bearing interference fit requires heating the bearing inner ring, which increases the workload of workers and poses a risk of burns.

[0007] Therefore, how to reduce the bearing DN value, reduce heat generation, and optimize clearance design is a problem that needs to be solved. Summary of the Invention

[0008] To address the aforementioned issues, this application provides an irregularly shaped bearing structure to resolve the problems of excessively high bearing DN values, high heat generation, and unreasonable clearance design in the prior art.

[0009] The technical solution of this application is: a special-shaped bearing structure, including an outer ring of the bearing, an inner ring with an integrally mounted shaft, rolling elements and a bearing cage;

[0010] The bearing outer ring, inner ring mounting shaft, and rolling elements are coaxially arranged, with the rolling elements located between the outer ring and inner ring mounting shaft. The bearing cage is connected to the rolling elements, and the inner ring mounting shaft can be integrally connected to the corresponding engine shaft.

[0011] Preferably, the inner ring mounting integrated shaft includes a connecting part and a fixing part. The connecting part is coaxially connected to the engine shaft, and the fixing part is detachably connected to the engine shaft. The diameter of the fixing part is larger than the diameter of the connecting part.

[0012] Preferably, the fixing part of the inner ring mounting integral shaft is fitted with the engine shaft stop.

[0013] Preferably, the fixing part is bolted to the engine shaft.

[0014] Preferably, a stop ring is provided at the position of the fixing part corresponding to the end of the engine shaft. The diameter of the stop ring is larger than the diameter of the engine shaft, and the inner wall of the stop ring is in close contact with the outer wall of the engine shaft to form a stop structure.

[0015] Preferably, the stop structure of the inner ring mounting integral shaft transitions with the engine shaft.

[0016] The irregular bearing structure of this application has the following advantages:

[0017] The irregularly shaped structure integrating the inner ring and shaft allows large-size gear shafts to be supported by small-sized bearings, directly reducing the bearing DN value and significantly reducing the heat generated when the bearing rotates at high speed. This effectively avoids bearing damage caused by excessive temperature rise, and eliminates the need to design a complex bearing oil supply and cooling system, simplifying the overall equipment design and reducing the difficulty of later maintenance.

[0018] The locating structure design ensures high coaxiality between the bearing and the engine shaft. Based on this, the initial clearance of the bearing can be designed to be smaller, which completely solves the problems of low rotational accuracy and high vibration and noise under light load conditions caused by traditional large initial clearance. It ensures that the bearing's working clearance is within a reasonable range under all working conditions, including heavy load and light load, effectively suppressing vibration and noise and significantly extending the service life of the bearing. Attached Figure Description

[0019] Figure 1 This is an assembly drawing of the bearing structure in the existing technology;

[0020] Figure 2 This is a schematic diagram of the overall structure of this application.

[0021] 1. Bearing outer ring; 2. Inner ring mounted on an integrated shaft; 3. Rolling elements; 4. Bearing cage; 5. Engine shaft; 6. Stop ring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] The first aspect of this application provides a non-circular bearing structure, such as... Figure 2 It includes the outer ring of the bearing 1, the inner ring mounting shaft 2, the rolling elements 3, and the bearing cage 4;

[0024] The outer ring 1, the inner ring mounting shaft 2, and the rolling element 3 are coaxially arranged, with the rolling element 3 located between the outer ring 1 and the inner ring mounting shaft 2; the bearing cage 4 is connected to the rolling element 3, and the inner ring mounting shaft 2 can be integrally connected with the corresponding engine shaft 5.

[0025] The bearing inner ring and mounting shaft are integrated into a single inner ring mounting shaft 2, replacing the traditional split bearing inner ring + gear shaft structure. This allows the large-size engine shaft 5 to be supported by smaller bearings, directly reducing the bearing's DN value structurally and significantly reducing the heat generated during high-speed rotation, thus avoiding bearing damage caused by excessive temperature rise. The coaxial arrangement of all components ensures the overall rotational coaxiality of the bearing, and the cooperation between the rolling elements 3 and the cage ensures the basic rotational performance of the bearing, laying a structural foundation for subsequent improvements in adaptability to all operating conditions.

[0026] Preferably, the inner ring mounting integrated shaft 2 includes a connecting part and a fixing part. The connecting part is coaxially connected to the engine shaft 5, and the fixing part is detachably connected to the engine shaft 5. The diameter of the fixing part is larger than the diameter of the connecting part.

[0027] The connecting part enables precise coaxial docking between the inner ring mounting shaft 2 and the engine shaft 5, ensuring the coaxiality of the bearing rotation and avoiding vibration and noise problems caused by eccentric rotation. The fixing part adopts a detachable connection method, replacing the traditional large interference fit fixing form, which greatly simplifies the assembly and disassembly process of the bearing and the engine shaft 5 and reduces the maintenance difficulty.

[0028] Preferably, the fixing part of the inner ring mounting shaft 2 is fitted with the stop joint of the engine shaft 5. The stop joint positioning method achieves precise radial and axial positioning of the fixing part and the engine shaft 5, further improving the coaxiality and fit of the bearing and the engine shaft 5, and effectively avoiding the problem of bearing runout during operation.

[0029] Preferably, the fixing part is bolted to the engine shaft 5.

[0030] Preferably, a stop ring 6 is provided at the position corresponding to the end of the engine shaft 5 of the fixing part. The diameter of the stop ring 6 is larger than the diameter of the engine shaft 5, and the inner wall of the stop ring 6 is in close contact with the outer wall of the engine shaft 5 to form a stop structure. The structural design of the stop ring 6 makes the stop fit more closely and precisely, further enhancing the positioning effect between the bearing and the engine shaft 5 and improving the coaxiality of the installation.

[0031] Preferably, the stop structure of the inner ring mounting integrated shaft 2 is transitionally fitted with the engine shaft 5. The transitional fit replaces the traditional large interference fit, which not only ensures the tightness of the connection between the stop structure and the engine shaft 5, avoiding loosening and gap rotation problems during operation, but also greatly reduces the assembly difficulty.

[0032] In summary, this application has the following advantages:

[0033] The irregularly shaped structure integrating the inner ring and shaft allows large-size gear shafts to be supported by small-sized bearings, directly reducing the bearing DN value and significantly reducing the heat generated when the bearing rotates at high speed. This effectively avoids bearing damage caused by excessive temperature rise, and eliminates the need to design a complex bearing oil supply and cooling system, simplifying the overall equipment design and reducing the difficulty of later maintenance.

[0034] The locating structure design ensures high coaxiality between the bearing and the engine shaft. Based on this, the initial clearance of the bearing can be designed to be smaller, which completely solves the problems of low rotational accuracy and high vibration and noise under light load conditions caused by traditional large initial clearance. It ensures that the bearing's working clearance is within a reasonable range under all working conditions, including heavy load and light load, effectively suppressing vibration and noise and significantly extending the service life of the bearing.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A non-circular bearing structure, characterized in that, It includes the outer ring of the bearing (1), the inner ring mounted on an integral shaft (2), the rolling elements (3) and the bearing cage (4); The bearing outer ring (1), inner ring mounting shaft (2), and rolling element (3) are coaxially arranged. The rolling element (3) is located between the bearing outer ring (1) and the inner ring mounting shaft (2). The bearing cage (4) is connected to the rolling element (3). The inner ring mounting shaft (2) can be integrally connected with the corresponding engine shaft (5).

2. The irregular bearing structure as described in claim 1, characterized in that, The inner ring mounting integrated shaft (2) includes a connecting part and a fixing part. The connecting part is coaxially connected to the engine shaft (5), and the fixing part is detachably connected to the engine shaft (5). The diameter of the fixing part is larger than the diameter of the connecting part.

3. The irregular bearing structure as described in claim 2, characterized in that, The fixing part of the inner ring mounting integrated shaft (2) is fitted with the stop of the engine shaft (5).

4. The irregular bearing structure as described in claim 2, characterized in that, The fixing part is bolted to the engine shaft (5).

5. The irregular bearing structure as described in claim 2, characterized in that, The fixing part is provided with a stop ring (6) at the position corresponding to the end of the engine shaft (5). The diameter of the stop ring (6) is larger than the diameter of the engine shaft (5). The inner wall of the stop ring (6) is in close contact with the outer wall of the engine shaft (5) to form a stop structure.

6. The irregular bearing structure as described in claim 5, characterized in that, The stop structure of the inner ring mounting integrated shaft (2) is transitionally fitted with the engine shaft (5).

Images