Elastic support integrated bearing and squeeze film damper integrated structure with outer ring provided with holes in radial direction

Abstract

The invention discloses an elastic support integrated bearing and squeeze film damper integrated structure with outer ring radial holes. The elastic support integrated bearing and squeeze film damper integrated structure comprises an elastic support integrated outer ring, a bearing inner ring, a retainer, a rolling body, a squeeze film damper, a bearing seat and the like. The elastic support integrated outer ring adopts the integrated design of a squirrel-cage type elastic support and the bearing outer ring, the radial size is reduced, the centering precision is improved, and an oil storage groove and a radial oil hole are formed in the outer side wall of the bearing outer ring of the integrated structure; the extrusion oil film damper is located on the outer side of the elastic support integrated bearing, and an oil film is communicated with a radial oil hole in the bearing outer ring, so that bearing lubrication and the extrusion oil film damper share a lubricating oil path; radial lubricating oil lubrication of the bearing is achieved through the arrangement of the radial oil holes, and the situation that the bearing is damaged due to lack of oil lubrication under the extreme working condition is avoided; meanwhile, the oil storage grooves and the radial oil holes can effectively promote flowing of lubricating oil in an oil film, formation of a dead cavity of the squeeze oil film damper is avoided, and the vibration reduction effect of the squeeze oil film damper is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed rotating machinery supports, and particularly relates to an integrated structure of an elastic support integrated bearing with radially open holes in the outer ring and an orifice plate damper, which realizes the effects of suppressing the vibration intensity of the engine, enhancing the lubrication and cooling performance of the bearing, reducing the radial size of the support structure, and improving the centering assembly accuracy. Background Art

[0002] Rolling bearings are important support components for the relative rotation of the stator and rotor in aero-engines, and their reliability directly determines the life and operating safety of the engine. In recent years, with the continuous improvement of the performance requirements for aero-engines, the working environment of rolling bearings tends to be at higher speeds and larger loads. The extreme working environment has caused the contact loads and moving speeds of the rolling elements of the bearing to increase significantly, which in turn has further caused the bearing lubrication state to transition from full-film lubrication to mixed lubrication or even boundary lubrication. When the bearing is in mixed lubrication or even boundary lubrication, the friction coefficient between the rolling elements of the bearing and the rolling contact area will increase significantly. At this time, the wear and heat generation of the bearing under high-speed and heavy-load working conditions will increase sharply, which will further lead to the failure of elastohydrodynamic lubrication of the bearing, premature wear of the surface, increased vibration, and even the phenomenon of spalling of the rolling elements and raceways, seriously affecting the service life of the bearing. Therefore, it is necessary to ensure the sufficiency of the lubricating oil supply of the bearing under high-speed and heavy-load working conditions to ensure reliable lubrication and safe operation of the bearing under extreme working conditions.

[0003] Secondly, due to the high stiffness characteristics of the bearing, the vibration of the rotor will be directly transmitted to the support structure. Therefore, it is necessary to use an elastic support to improve the stiffness of the rotor support structure, and further combine it with an orifice plate damper to utilize its oil film viscous damping to convert the vibration kinetic energy into the internal energy of the lubricating oil, thereby reducing the vibration of the rotor system and its transmission. Therefore, an elastic support and an orifice plate damper are often installed outside the bearing of the rotor system to achieve vibration suppression of the rotor system.

[0004] As one of the key components for vibration suppression and damping control in aero-engines, the squirrel-cage elastic support can, on the one hand, absorb vibration energy through its own elastic deformation to reduce the vibration transmitted to the stator structure of the engine; on the other hand, it can also change the critical speed of the rotor system by installing elastic supports with different stiffnesses to avoid resonance problems within the operating speed range. However, due to the need to install the squirrel-cage elastic support and bearings separately during the installation process of the traditional engine structure, it requires a relatively large radial space. Additionally, during the installation of the elastic support and bearings, it is necessary to ensure their alignment and fit. If there is a deviation in the alignment and fit, it will lead to the stiffness coupling failure of the elastic support and bearings, thereby affecting the load transfer of the rotor system. Moreover, the misalignment between the squirrel-cage elastic support and the bearings will cause the thin-walled beam structure of the squirrel-cage elastic support to bear alternating bending stresses, resulting in fretting wear at the mating interface with the bearing housing and accelerating the initiation of fatigue cracks. Based on this, the integration design of the bearing outer ring and the squirrel-cage elastic support (such as Chinese patents CN110529498B, CN111623036B, CN201297208Y, etc.) can be adopted to reduce the radial dimension and improve the alignment accuracy.

[0005] In addition, since the traditional design method of the squeeze film damper does not form a flow-through oil supply circuit for the oil film, after the lubricating oil flows into the chamber of the squeeze film damper to form an oil film, the oil pressure provided by the oil supply pipeline of the squeeze film damper is relied on to support the oil film, and the fluidity of the lubricating oil in the oil film is poor. Under the working conditions of high-speed and heavy-load of the rotor, the oil film will not only be affected by the high-temperature boundary of the bearing outer ring, but also be subjected to the continuous extrusion action generated during the rotation of the rotor due to the need to dissipate vibration energy by means of its own damping effect. Under the action of high temperature and continuous extrusion, the oil film of the squeeze film damper will have the problem of lubricating oil coking, resulting in the failure of the oil film. Based on this, it is necessary to design a flow-through oil supply path for the squeeze film damper to ensure the continuous effectiveness of its damping and vibration reduction effect. Summary of the Invention

[0006] (I) Object of the Invention In view of the background art and the above requirements, the present invention proposes an integrated structure of an elastic support integrated bearing with radially open holes in the outer ring and a squeeze film damper. Firstly, it can realize the lubrication of the bearing based on the radial oil holes in the outer ring of the squirrel-cage elastic support integrated bearing. Secondly, the alignment accuracy of the bearing-squirrel-cage elastic support assembly structure can be improved by the integrated manufacturing of the squirrel-cage elastic support and the bearing outer ring, and the radial dimension can be reduced. Finally, through the design of the flow-through oil circuit of the squeeze film damper, the fluidity of the lubricating oil in the oil film of the squeeze film damper can be greatly improved, and the heat of the bearing outer ring can be taken away in time to avoid the problem of lubricating oil coking caused by oil film extrusion and overheating, ensuring the reliable and effective damping and vibration reduction performance of the squeeze film damper. Based on the above, the present invention has important engineering significance for the lightweight design and safe and stable operation of aero-engines.

[0007] (2) Technical Solution To achieve the object of the invention and solve its technical problems, the present invention adopts the following technical solutions: The first object of the present invention is to provide an integrated structure of a spring-supported bearing with radial holes in the outer ring and an orifice-plate squeeze-film damper, which is used for elastic support, lubrication cooling and vibration suppression of a rotor system in high-speed rotating machinery, and includes: A bearing housing, which is provided with an oil supply pipeline therein; An inner bearing ring, which is fixedly sleeved on a rotating shaft; An integrated spring-supported outer ring, which is an integrally formed cylindrical structural member extending along the axial direction. The front section of the axial direction is formed into a squirrel-cage elastic support, and the rear section of the axial direction is formed into an outer bearing ring. Among them: A raceway space for accommodating a cage and rolling elements is formed between the outer bearing ring and the inner bearing ring. There is a radial clearance between the outer bearing ring and the bearing housing. Sealing components are provided at both axial ends between the two to form a sealed space, and the oil supply pipeline on the bearing housing communicates with this sealed space. And among them, an annular oil storage groove is opened on the outer side wall of the outer bearing ring. A plurality of radial oil holes are arranged along the circumferential direction at the bottom of the oil storage groove, and each radial oil hole communicates with the raceway space. An orifice-plate squeeze-film damper is formed in the sealed space between the outer bearing ring and the bearing housing and forms an oil film cavity, which is used to form a pressurized oil film and provide a damping force, and is communicated with the oil storage groove and the radial oil holes on the outer bearing ring to constitute a lubricating oil flow circuit. The lubricating oil introduced into the oil film cavity through the oil supply pipeline of the bearing housing enters the oil storage groove after flowing through the oil film area, and enters the bearing raceway space through each radial oil hole.

[0008] The second object of the present invention is to provide a rotor system of a high-speed rotating machinery, which is provided with the integrated structure of the spring-supported bearing with radial holes in the outer ring and the orifice-plate squeeze-film damper of the present invention.

[0009] (3) Technical Effects Compared with the prior art, the integrated structure of the spring-supported bearing with radial holes in the outer ring and the orifice-plate squeeze-film damper of the present invention has the following beneficial and remarkable technical effects: (1) The integrated manufacturing of the outer bearing ring and the squirrel-cage elastic support reduces the radial dimension while reducing the assembly operation requirements and improves the alignment accuracy of the rotating and static components. (2) The innovative use of the radial oil holes on the integrated spring-supported bearing outer ring can greatly improve the lubrication and cooling performance of the bearing and extend the service life of the bearing. (3) The through-flow design of the lubricating oil flow path of the orifice-plate squeeze-film damper can avoid the problem of lubricating oil coking caused by excessive oil film temperature and excessive extrusion, and ensure the effectiveness of the structure of the orifice-plate squeeze-film damper. (4)The flow - through design of the lubricating oil flow path of the squeeze film damper can effectively ensure the fluidity of the lubricating oil in the oil film, significantly improve the gradient distribution characteristics of the oil film pressure field, reduce the maximum oil film pressure, effectively eliminate the local dead - cavity phenomenon caused by flow stagnation in the traditional structure, and enhance the dynamic stability and reliability of the squeeze film damper. Brief Description of the Drawings

[0010] Figure 1 It is a schematic diagram of the integrated structure of the resilient - support integrated bearing with radial holes in the outer ring and the squeeze film damper provided by the embodiment of the present invention; Figure 2 It is a schematic diagram of the assembly structure of the existing non - integrated resilient - support bearing and the squeeze film damper; Figure 3 It is a schematic diagram of the distribution of the oil storage groove and radial oil holes in the bearing outer ring in the present invention; Figure 4 It is a partial enlarged view of the oil storage groove and radial oil holes in the bearing outer ring in the present invention; Figure 5 It is a block diagram of the lubricating oil flow path of the integrated structure of the resilient - support outer ring and the squeeze film damper; Description of the reference numerals: mounting edge 1, oil supply pipeline 2, bearing housing 3, O - ring 4, squeeze film damper 5, oil storage groove 6, radial oil hole 7, rolling element 8, rotating shaft 9, bearing inner ring 10, fixing bolt 11, squirrel - cage elastic support 12, bearing outer ring 13, cage 14, bearing 15. Detailed Description of the Embodiment

[0011] The present invention aims to provide an integrated structure of a resilient - support integrated bearing with radial holes in the outer ring and a squeeze film damper. To make the purpose, technical solution and advantages of the implementation of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. It should be noted that the attached Figure 1 to the attached Figure 5 are only examples, which are not drawn according to the conditions of equal - scale and specific structural details, and should not be used as a limitation on the scope actually required by the present invention.

[0012] Such as Figure 1As shown in the figure, the integrated structure of the spring-supported integrated bearing with radial holes in the outer ring and the squeeze film damper of the present invention includes a spring-supported integrated bearing (1, 6, 7, 8, 10, 12, 13, 14), a squeeze film damper 5, an O-ring 4, a bearing housing 3, a rotating shaft 9, and a lubricating oil flow path 2. The inner ring 10 of the bearing is sleeved and fixed on the rotating shaft 9. The spring-supported outer ring is integrated by a bearing outer ring 13, a cage-type elastic support 12, and a mounting edge 1. The mounting edge 1 is fixed to the bearing housing 3 through a fixing bolt 11. The rolling elements 8 are placed in a cage 14 between the inner and outer rings of the bearing. The squeeze film damper 5, the oil storage tank 6, and the radial oil holes 7 share the lubricating oil supply pipeline 2 in the bearing housing to form a flow-through lubricating oil flow path system as shown in Figure 5 the figure.

[0013] More specifically, in the integrated structure of the spring-supported integrated bearing with radial holes in the outer ring and the squeeze film damper of the present invention, as shown in Figure 1 the figure, a lubricating oil supply pipeline 2 is provided in the bearing housing 3; the inner ring 10 of the bearing is fixedly sleeved on the rotating shaft 9; the spring-supported outer ring is an integrally formed cylindrical structural member extending axially. The front section of the axis forms a cage-type elastic support 12, and the rear section of the axis forms a bearing outer ring 13.

[0014] A raceway space for accommodating the cage 14 and the rolling elements 8 is formed between the bearing outer ring 13 and the bearing inner ring 10. There is a radial gap between the outer side wall of the bearing outer ring 13 and the inner wall surface of the bearing housing 3. Sealing components (preferably O-rings 4) are provided at both axial ends between the two to form a sealed space. The lubricating oil supply pipeline 2 on the bearing housing 3 communicates with this sealed space. And among them, an annular oil storage tank 6 is opened on the outer side wall of the bearing outer ring 13. A number of radial oil holes 7 are provided along the circumferential direction at the bottom of the oil storage tank 6. Each radial oil hole 7 communicates with the raceway space between the bearing outer ring 13 and the bearing inner ring 10.

[0015] The squeeze film damper 5 is integrally arranged in the sealed space between the bearing outer ring 13 and the bearing housing 3 and forms an oil film cavity for forming a pressure-bearing oil film and providing a damping force, and is communicated with the oil storage tank 6 and the radial oil holes 7 opened on the outer side wall of the bearing outer ring 13 to form a lubricating oil flow-through loop. The lubricating oil introduced into the oil film cavity through the lubricating oil supply pipeline 2 of the bearing housing 3 enters the oil storage tank 6 after flowing through the oil film area and enters the bearing raceway space through each radial oil hole 7.

[0016] Figure 2Shows the structural assembly diagram of the prior art non-integrated design of the elastic support - bearing, which includes bearing 15, squirrel-cage elastic support 12, O-ring 4, squeeze film damper 5, rotating shaft 9, bearing housing 3, lubricating oil flow path 2, and fixing bolts 11. The bearing 15 and the squirrel-cage elastic support 12 are two independent separate components. The bearing 15 that is separately fitted with the elastic support 12 needs to be fixed through the bearing housing 3, increasing the axial and radial structural dimensions. In the structure of the prior art non-integrated design of the elastic support - bearing, the squeeze film damper 5 is filled with lubricating oil from the lubricating oil flow path 2 to form a squeeze film. However, since no through-flow circuit is formed, the fluidity of the lubricating oil in the squeeze film damper 5 is poor, the maximum oil film pressure caused by the vibration extrusion of the rotor is large, and the damping and vibration reduction performance is poor.

[0017] Compared with Figure 2 the prior art split structure shown, in the embodiment of the present invention, by integrating the squirrel-cage elastic support with the outer ring of the bearing, such a setting reduces the radial dimension of the structure and improves the centering accuracy. At the same time, in the embodiment of the present invention, a plurality of radial oil holes 7 are evenly distributed circumferentially on the outer ring 13 of the bearing of the integrated elastic support outer ring, and by using the lubricating oil flow path 2 and the oil storage groove 6, a through-flow circuit is formed for the lubricating oil in the squeeze film damper 5 formed outside the outer ring 13 of the bearing, and the lubricating oil in the squeeze film damper 5 can be circulated and replaced. Such a setting ensures the stability of the oil film damping and vibration reduction performance of the squeeze film damper 5.

[0018] Figure 3 Shows the schematic diagram of the distribution of the oil storage groove and radial oil holes on the outer ring of the bearing in the integrated elastic support outer ring of the present invention, including the outer ring 13 of the bearing, the inner ring 10 of the bearing, the cage 14, the rolling elements 8, the oil storage groove 6, the radial oil holes 7, etc. The annular oil storage groove 6 is opened on the outer side wall of the outer ring 13 of the bearing of the integrated elastic support outer ring, and is of an overall symmetrical structure. Its symmetry plane is coplanar with the plane formed by the centers of all the rolling elements 8, ensuring that the lubricating oil covers all the contact areas of the rolling elements through the circumferential uniform distribution method to avoid local lubrication failure; a plurality of radial oil holes 7 are evenly arranged along the circumference of the outer ring 13 of the bearing, and the center lines of each radial oil hole 7 pass through the centers of the rolling elements 8, ensuring the lubrication efficiency and improving the service life of the bearing.

[0019] Figure 4 Shows the specific details of the oil storage groove and radial oil holes on the outer ring of the bearing in the integrated elastic support outer ring. Combining Figure 4 with, the radial oil holes 7 in the embodiment of the present invention adopt cylindrical channels or frustum-shaped tapered channels. Figure 4The situation when a frustum-shaped tapered channel is adopted is indicated by the dashed line in the figure. By adopting a channel with this structural form, the lubricating oil flow rate can be increased. The taper along the radial direction is not greater than tan15°. The oil outlet end area of each radial oil hole 7 is 2 - 3 mm², and the quantity ratio of the radial oil holes 7 to the rolling elements 8 is not less than 1. The specific number of the radial oil holes 7 can be determined according to the number of rolling elements and the working conditions to ensure that the lubricating oil flow rate and velocity meet the bearing lubrication requirements under different working conditions, thereby realizing the radial lubrication of the rolling elements 8.

[0020] Furthermore, in combination with Figure 4 , in the embodiment of the present invention, an oil storage groove 6 is arranged outside the radial oil hole 7. Its cross-section is rectangular, with a depth of 1 - 3 mm and a width of 3 - 4 mm, which is used to temporarily store part of the lubricating oil from the squeeze film damper. By storing part of the lubricating oil, the stability of the lubrication pressure and temperature of the bearing by the radial oil hole 7 is ensured. At the same time, the oil pressure fluctuation at the inlet of the radial oil hole is reduced, and a transitional oil source is provided when part of the oil supply is interrupted or the lubricating oil flow rate fluctuates. Each radial oil hole 7 is arranged circumferentially at the bottom of the oil storage groove 6 and communicates with the raceway space between the bearing outer ring 13 and the bearing inner ring 10. The lubricating oil in each radial oil hole 7 comes from the squeeze film damper 5, flows into the radial oil hole 7 after being stabilized by the oil storage groove 6, and is ejected from the oil outlet of the radial oil hole 7 to realize the lubrication of the bearing.

[0021] Preferably, as Figure 1 shown, in the embodiment of the present invention, for the cage-type elastic support 12 in the elastic support integrated outer ring, the axial end forms a flange mounting edge 1 and is provided with a plurality of bolt holes evenly distributed circumferentially. The integrated outer ring is fixed to the bearing seat through the fixing bolts 11, and the centering accuracy of the entire assembly is improved through flange surface positioning. Moreover, the cage bars of the cage-type elastic support 12 are a plurality of thin-walled elastic beam bars evenly distributed circumferentially, which are used to provide radial elastic support during the loading process, absorb part of the vibration energy and adjust the critical speed of the rotor system. Each elastic beam bar is connected to the bearing outer ring 13 through a gradually changing cross-section to reduce stress concentration, and the cross-sectional dimensions and distribution positions of each elastic beam bar are parametrically configured according to the design speed and loading conditions to control the bearing support stiffness, optimize the distribution of the natural frequency and critical speed of the rotor system, and avoid the risk of resonance within the working speed range.

[0022] In addition, for the squeeze film damper 5 in the embodiment of the present invention, its oil film cavity is of an annular structure and is located in the sealed space between the bearing outer ring 13 and the bearing housing 3. The oil film thickness is preferably designed to be 1‰ - 5‰ of the outer diameter of the integrated outer ring, and the oil supply pressure is not less than 0.3 MPa to effectively dissipate high-frequency vibrations. The sealing component between the bearing outer ring 13 and the bearing housing 3 is an O-ring, which is installed in the sealing grooves opened at both ends of the outer surface of the bearing outer ring 13 or the inner wall of the bearing housing to form a sealed space and prevent lubricating oil leakage. Moreover, the material of the O-ring is oil-resistant rubber, which can work stably for a long time under high-temperature and high-pressure environments to ensure the sealing performance of the squeeze film damper. Also, a throttle hole or a pressure stabilizing cavity structure is preferably provided in the lubricating oil supply pipeline 2 inside the bearing housing 3 near the oil film cavity to regulate the flow rate and pressure of the lubricating oil entering the squeeze film damper 5. After the lubricating oil flows through the supply pipeline 2, it first enters the squeeze film area to form a squeeze film. After filling the oil film cavity, it naturally overflows to the oil storage tank and is then sprayed to the rolling element contact area through the radial oil holes to achieve bearing lubrication, constituting a flow path of "damping first and then lubrication" to enhance the synergistic effect of vibration reduction and cooling. Among them, the squeeze film exists in the cavity formed by the bearing housing, the bearing outer ring, and the O-ring, and the oil film dissipates the vibration energy of the squeeze film damper in this cavity.

[0023] Figure 5 shows the lubricating oil flow path block diagram of the integrated structure of the spring-supported integrated bearing with radial holes in the outer ring and the squeeze film damper in the embodiment of the present invention. Combining Figure 5 , in the embodiment of the present invention, after the lubricating oil is pressurized by the lubricating oil pump and flows through the engine oil supply pipeline and the oil flow path in the bearing housing, it first supplies lubricating oil to the squeeze film damper 5 and relies on the lubricating oil pump to ensure the stability of the oil pressure. When the squeeze film damper 5 is filled with lubricating oil, the lubricating oil sequentially flows through the oil storage tank 6 and the radial oil holes 7 on the bearing outer ring of the spring-supported integrated outer ring proposed by the present invention, and is ejected from the oil outlet of the radial oil hole 7 to complete the lubrication of the rolling elements 8. Subsequently, via the oil return pipeline, the lubricating oil flows back to the lubricating oil tank for cooling. After cooling is completed, it is pumped out by the lubricating oil pump for the next cycle of operation.

[0024] It should be noted that in the embodiments of the present invention, the squeeze film damper 5 is communicated with the oil storage groove 6 and the radial oil hole 7 of the bearing outer ring of the elastic support integrated outer ring, forming a shared flow oil circuit system, which can realize the lubricating oil supply for the squeeze film damper, the oil storage groove and the radial oil hole. Based on this, the oil film of the squeeze film damper realizes the oil supply of the flow oil circuit, can timely take away the heat generated by the oil film damping energy dissipation and the bearing heat conduction, and effectively ensure the stability of the oil film oil pressure in time, greatly improving the damping and vibration reduction performance of the squeeze film damper; at the same time, the opening of the radial oil hole of the elastic support integrated bearing outer ring and the design of the flow oil circuit enable the lubricating oil to maintain fluidity when the rotor passes through the critical speed, reduce the maximum pressure of the squeeze film, and then reduce the non-linear oil film force, prevent the rotor from losing stability, and improve the rotor stability.

[0025] An integrated structure of an elastic support integrated bearing with a radially open outer ring and a squeeze film damper provided by the present invention integrates the elastic support and the bearing outer ring into an elastic support integrated outer ring, and an annular oil storage groove and circumferentially distributed radial oil holes are opened on the bearing outer ring, which solves the lubricating oil supply problem under the conditions of high speed and heavy load of the bearing, reduces the radial dimension of the structure and improves the assembly accuracy; secondly, the flow design of the squeeze film damper can enhance the fluidity of the lubricating oil in the oil film, avoid the appearance of coking and dead cavity phenomena, improve the distribution of the oil film pressure inside the damper, reduce the maximum oil film pressure formed by the extrusion of the oil film when the rotor vibrates, and improve the vibration reduction performance of the damper.

[0026] Through the above embodiments, the purpose of the present invention is completely and effectively realized. Those skilled in the art can understand that the present invention includes but is not limited to the content described in the drawings and the above specific embodiments. Although the present invention has been described with respect to the currently considered most practical and preferred embodiments, it should be understood that the present invention is not limited to the disclosed embodiments, and any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. An integrated structure of a spring-supported integrated bearing with radially open holes on the outer ring and an orifice oil film damper, characterized in that Comprising: A bearing housing, inside which there is an oil supply pipeline; An inner bearing ring, fixedly sleeved on a rotating shaft; An integrally elastic and supported outer ring, which is an integrally formed cylindrical structural member extending axially as a whole. The front axial section thereof is formed into a squirrel-cage elastic support, and the rear axial section is formed into a bearing outer ring, wherein: A raceway space for accommodating a cage and rolling elements is formed between the bearing outer ring and the inner bearing ring; There is a radial clearance between the bearing outer ring and the bearing housing, and sealing components are provided at both axial ends between the two to form a sealed space, and the oil supply pipeline on the bearing housing communicates with this sealed space; And wherein, an annular oil storage groove is formed on the outer side wall of the bearing outer ring, and a plurality of radial oil holes are provided along the circumferential direction at the bottom of the oil storage groove, and each radial oil hole communicates with the raceway space; An squeeze film damper is formed in the sealed space between the bearing outer ring and the bearing housing and forms an oil film cavity for forming a pressurized oil film and providing damping force, and is communicated with the oil storage groove and the radial oil holes on the bearing outer ring to constitute a lubricating oil flow circuit. The lubricating oil introduced into the oil film cavity through the oil supply pipeline of the bearing housing enters the oil storage groove after flowing through the oil film area and enters the bearing raceway space through each radial oil hole.

2. The integrated structure of the elastic support integrated bearing with radial holes in the outer ring and the squeeze film damper according to claim 1, wherein, Each radial oil hole is a cylindrical channel or a frustum-shaped tapered channel. When a frustum-shaped tapered channel is adopted, the channel gradually contracts starting from the bottom of the oil storage groove, and its taper along the radial direction is not greater than tan15°, and the ratio of the radial oil holes to the number of rolling elements is not less than 1.

3. The integrated structure of an elastic support integrated bearing with radially open holes on the outer ring and an orifice oil film damper according to claim 1, characterized in that The oil film cavity of the squeeze film damper is an annular structure, located in the sealed space between the bearing outer ring and the bearing housing, the oil film thickness is 1‰ - 5‰ of the outer diameter size of the integrally elastic and supported outer ring, and the oil supply pressure is not less than 0.3 MPa.

4. The integrated structure of an elastic support integrated bearing with radially open holes in the outer ring and an orifice oil film damper according to claim 1, characterized in that, The oil storage groove is annular in the circumferential direction, its symmetry plane is coplanar with the plane formed by the centers of all rolling elements, and its cross-section is rectangular, which is used to temporarily store part of the lubricating oil from the squeeze film damper, reduce the oil pressure fluctuation at the inlet of the radial oil holes, and provide a transitional oil source when partial oil supply is interrupted or the lubricating oil flow fluctuates.

5. The integrated structure of an elastic support integrated bearing with radially open holes in the outer ring and an orifice oil film damper according to claim 1, characterized in that, In the integrally elastic and supported outer ring, the end of the squirrel-cage elastic support is formed into a flange mounting edge and is provided with a plurality of bolt holes evenly distributed in the circumferential direction. The integrally elastic and supported outer ring is fixed to the bearing housing through fixing bolts, and the centering accuracy of the entire assembly is improved through flange surface positioning.

6. The integrated structure of an outer-ring radially perforated elastic support integrated bearing and a squeeze film damper according to claim 1, characterized in that, The squirrel-cage bars of the squirrel-cage elastic support are a plurality of thin-walled elastic beam bars evenly distributed in the circumferential direction. Each elastic beam bar is connected to the bearing outer ring through a gradually changing cross-section to reduce stress concentration, and the cross-sectional dimensions and distribution positions of each elastic beam bar are parametrically configured according to the design speed and load conditions to regulate the support stiffness of the integrally elastic and supported bearing.

7. The integrated structure of a resilient support integrated bearing with radial openings in the outer ring and an orifice oil film damper according to claim 1, characterized in that, The sealing component between the bearing outer ring and the bearing housing is an O-ring, which is installed in the sealing grooves opened at both ends of the outer surface of the bearing outer ring or the inner wall of the bearing housing, and the material of the O-ring is oil-resistant rubber to ensure the sealing performance of the squeeze film damper.

8. The integrated structure of a resilient support integrated bearing with radially open holes on the outer ring and an orifice oil film damper according to claim 1, characterized in that, The lubricating oil supply pipeline inside the bearing housing is provided with a throttle hole or a pressure stabilizing cavity structure near the oil film cavity, which is used to regulate the flow rate and pressure of the lubricating oil entering the squeeze film damper. After the lubricating oil flows through the supply pipeline, it first enters the squeeze film area to form a squeeze film. After filling the oil film cavity, it naturally overflows to the oil storage tank, and then is sprayed to the rolling element contact area through the radial oil hole.

9. The integrated structure of the resilient support integrated bearing with radial holes in the outer ring and the squeeze film damper according to claim 1, characterized in that, The lubricating oil flow circuit is a closed-loop circuit, and a lubricating oil pump, a lubricating oil supply pipeline, a supply pipeline inside the bearing housing, the oil film cavity of the squeeze film damper, an oil storage tank, a radial oil hole, a bearing raceway space, an oil return pipeline and a lubricating oil tank are sequentially arranged along the flow path.

10. A rotor system of a high-speed rotating machine, characterized in that, An integrated structure of an elastic support bearing with radial holes in the outer ring and a squeeze film damper described in any one of claims 1 to 9 is provided.

Images