Squeezing oil film damper

Abstract

A squeeze film damper arranged at a bearing comprises a squeeze film damper outer ring connected to a bearing outer ring of the bearing in a sleeving mode, and an oil inlet penetrating through the squeeze film damper outer ring is formed in the squeeze film damper outer ring; the pair of oil sealing rings is arranged between the outer ring of the squeeze film damper and the outer ring of the bearing; an oil film cavity is defined by the extrusion oil film damper outer ring, the bearing outer ring and the paired oil sealing rings in a surrounding mode. Wherein a non-return assembly is arranged in the oil inlet and comprises a plug piece and a spring, the spring abuts against the plug piece and the oil inlet, the plug piece can move between a through-flow position and a blocking position, when oil pressure in the oil film cavity exceeds a threshold value, the plug piece enters the blocking position from the through-flow position, and in the through-flow position, the plug piece does not block the oil inlet; lubricating oil is allowed to enter the oil film cavity through the oil inlet; in the blocking position, the oil inlet is blocked by the plug piece, and lubricating oil is prevented from entering and exiting from the oil inlet. The squeeze film damper can maintain the damping performance when an engine is subjected to an impact load.

Description

Technical Field

[0001] The present invention relates to the field of engine bearing vibration damping, and specifically, to a squeeze film damper. Background Art

[0002] The squeeze film damper is a new type of vibration damping technology developed in the 1960s. A collar is installed outside the rolling bearing, such that there is a gap between the two, and the rotation of the collar is restricted by using components such as pins or squirrel-cage elastic supports. Lubricating oil is filled into the gap between the collar and the outer ring of the rolling bearing through an oil inlet to form an oil film. When the rotating shaft vibrates, the oil film is squeezed, and the kinetic energy is converted into internal energy through the viscous damping of the lubricating oil, thereby playing a role in vibration reduction. Due to the significant vibration reduction effect and small occupied space of the squeeze film damper, it has been widely used in aeroengines and has become a typical design for reducing engine vibration.

[0003] However, the structure of the traditional squeeze film damper is mainly used to reduce the vibration load during the normal operation of aeroengines, and lacks the ability to cope with impact loads. Specifically, when the engine is subjected to an impact load caused by an impact accident such as a bird strike, as Figure 1 shown, the fan blade 600 first bears the impact load F(t) that varies with time t, and then the impact load is transmitted through the fan disk 800 and the rotating shaft 300 to the fulcrum 400 provided with a bearing and a squeeze film damper, and then the support cone wall by the fulcrum 400 is transmitted to the aeroengine installation system through the intermediate casing 500 and finally transmitted to the aircraft. During this process, the rotating shaft 300 is stressed and vibrates violently. It has been found through experiments that the lubricating oil used for damping vibration reduction in the traditional squeeze film damper provided at the rotating shaft is likely to spray out through the oil inlet under the action of such impact force, such that the squeeze film damper loses its damping performance due to the loss of lubricating oil, and further easily causes damage to the engine structure. In addition, after the sudden loss of lubricating oil, the time for refilling the lubricating oil is uncontrollable, which also cannot meet the damping requirements for the engine to resume normal operation within a short time after being subjected to an impact load.

[0004] Therefore, it is necessary to propose an improved squeeze film damper that can solve the problems and defects existing in the above-mentioned prior art. Summary of the Invention

[0005] The object of the present invention is to provide an improved squeeze film damper, which is provided with a check assembly in the oil inlet, thereby preventing the lubricating oil in the oil film cavity from accidentally leaking through the oil inlet and ensuring that the squeeze film damper can still achieve the damping function under the action of an impact load.

[0006] According to the present invention, an squeeze film damper is provided. The squeeze film damper is disposed at a bearing and includes: an outer ring of the squeeze film damper, which is sleeved on the outer ring of the bearing of the bearing and has an oil inlet penetrating through the outer ring of the squeeze film damper; and a pair of oil sealing rings, which are disposed between the outer ring of the squeeze film damper and the outer ring of the bearing. The outer ring of the squeeze film damper, the outer ring of the bearing and the pair of oil sealing rings surround and define an oil film cavity. Wherein, a check component is disposed inside the oil inlet. The check component includes a plug and a spring. The spring abuts against the plug and the oil inlet respectively. The plug can move between a flow-through position and a blocking position. When the oil pressure in the oil film cavity exceeds a threshold value, the plug moves from the flow-through position to the blocking position. In the flow-through position, the plug does not block the oil inlet, allowing lubricating oil to enter the oil film cavity through the oil inlet. In the blocking position, the plug blocks the oil inlet, preventing the lubricating oil from entering and exiting the oil inlet. With this arrangement, when the engine is operating normally, the oil inlet is unobstructed, and the lubricating oil can circulate in the oil film cavity through the oil inlet to achieve damping performance. When the engine is subjected to an impact load and the rotating shaft vibrates violently, the oil inlet is blocked, so that the lubricating oil cannot be instantaneously ejected through the oil inlet, enabling it to remain in the oil film cavity, thereby maintaining the damping performance. When the engine is no longer subjected to an impact load, the plug resets under the action of the spring, enabling the lubricating oil to re-enter the oil film cavity through the oil inlet and operate normally.

[0007] According to another aspect of the present invention, a first step portion is formed on the inner surface of the oil inlet. The plug has a plug body and a boss. The spring is sleeved on the plug body and abuts against the first step portion of the oil inlet at the lower end and abuts against the boss at the upper end. In this way, the plug can optionally reciprocate between the flow-through position and the blocking position by means of the elasticity of the spring.

[0008] According to another aspect of the present invention, the oil inlet further includes a second step portion, wherein the second step portion is above the first step portion, and wherein the diameter of the oil inlet gradually decreases in the direction from the second step portion to the first step portion. This can enable the spring to be stably placed at the first step portion and can block the oil inlet by making the boss of the plug abut against the second step portion.

[0009] According to another aspect of the present invention, the oil inlet is located at the bottom of the outer ring of the squeeze film damper and radially penetrates the outer ring of the squeeze film damper. In this way, the oil inlet in the working position (i.e., during the operation of the engine) is below the oil film cavity, and the check component can be stably placed on the step portion of the oil inlet by means of gravity without the need for additional fixing devices.

[0010] According to another aspect of the present invention, in the blocking position, the boss of the plug abuts against the second step portion of the oil inlet. In this way, the plug can block the oil inlet, thereby preventing the lubricating oil from entering and exiting the oil film cavity through the oil inlet.

[0011] According to another aspect of the present invention, the size of the plug is designed such that when the plug is in the flow-through position, there is a gap between the plug and the outer ring of the bearing, so that the oil film cavity is unobstructed and the lubricating oil can circulate in the entire oil film cavity.

[0012] According to another aspect of the present invention, at least one of the oil seals has a lapping portion, and the lapping portion includes a first lapping piece and a second lapping piece that are superposed and can move relative to each other. Among them, the opposite surfaces of the first lapping piece and the second lapping piece are spaced apart by a certain distance to form a channel. The provision of the lapping portion facilitates the installation of the oil seal into the outer ring of the bearing, and the provision of a certain spacing between the opposite surfaces of the lapping pieces facilitates the lubricating oil to flow out of the oil film cavity through the oil seal. During the normal operation of the engine, the lubricating oil needs to continuously flow through the oil film cavity instead of remaining in the oil film cavity all the time to prevent the temperature from being too high and affecting the performance of the components. Therefore, the provision of the channel enables the lubricating oil to flow into the oil film cavity through the oil inlet and flow out of the oil film cavity through the channel, thereby achieving a dynamic balance.

[0013] According to another aspect of the present invention, in a cross-section along the axial direction, the channel is in a wavy shape. In the embodiment of the present invention, the wavy shape includes a zigzag shape or a concave-convex shape, but other suitable wavy shapes such as a wave shape can also be envisaged in alternative embodiments. Additionally, the distance between the opposite surfaces of the first lapping piece and the second lapping piece is 0.1 mm. This setting lengthens the time for the lubricating oil to flow through the channel and reduces the flow rate, so as to prevent a large amount of lubricating oil from being ejected through the channel of the oil seal when the engine is subjected to impact loads, and achieve the purpose of effectively retaining the lubricating oil in the oil film cavity.

[0014] According to another aspect of the present invention, the oil seal is embedded in the outer ring of the bearing. In the embodiment of the present invention, the cross-section of the oil seal is rectangular, but suitable shapes such as circular can also be envisaged in alternative embodiments.

[0015] The squeeze film damper of the present invention is provided with a check component composed of a spring and a plug in the oil inlet, and a corrugated channel is provided in the oil sealing ring. In this way, when the engine is in normal operation, the lubricating oil enters the oil film cavity through the oil inlet and flows out of the oil film cavity through the channel in the oil sealing ring, achieving dynamic balance while forming an oil film and preventing the temperature of the oil film from being too high; when the bearing of the engine vibrates violently due to bird strike or other impacts, the oil film presses the plug downward, causing the spring to compress and the plug to block the oil inlet, preventing the lubricating oil from spraying out through the oil inlet. At the same time, the corrugated channel in the oil sealing ring prolongs the time for the lubricating oil to flow out of the oil film cavity through the oil sealing ring, ensuring that there is still lubricating oil remaining in the oil film cavity during the peak action time of the impact load, and maintaining the damping capacity of the squeeze film damper; when the action time of the impact load has passed, the pressure acting on the plug decreases. At this time, the spring drives the plug to reset upward under the action of its own elastic force, so that the oil inlet is no longer blocked, allowing the lubricating oil to be replenished into the oil film cavity and continue to perform the damping function. Brief Description of the Drawings

[0016] To more fully understand the present disclosure, reference may be made to the following description of exemplary embodiments in conjunction with the accompanying drawings. The drawings are not intended to limit the present disclosure to the specific embodiments depicted, and are not necessarily to scale. In the drawings:

[0017] Figure 1 is a schematic partial cross-sectional view of the fan booster stage section of the engine, in which the force transmission path of the impact load in the engine is shown by a dashed arrow;

[0018] Figure 2 is a cross-sectional view taken along the axial direction of the squeeze film damper of the preferred embodiment of the present invention;

[0019] Figure 3 is Figure 2 an enlarged cross-sectional view of the oil inlet of the squeeze film damper, in which the check component is in the flow-through position;

[0020] Figure 4 is Figure 2 an enlarged cross-sectional view of the oil inlet of the squeeze film damper, in which the check component is in the blocked position;

[0021] Figure 5 is Figure 2 a front view of the oil sealing ring of the squeeze film damper;

[0022] Figure 6 is Figure 5 a partial cross-sectional view of the overlapping portion of the oil sealing ring taken along line A-A according to an embodiment;

[0023] Figure 7 is Figure 5Partial cross-sectional view of the lip seal according to another embodiment, taken along line A-A;

[0024] Figure 8 is Figure 5 Partial cross-sectional view of the lip seal taken along line B-B; and

[0025] Figure 9 Cross-sectional view of the lip seal provided between the outer ring of the squeeze film damper and the outer ring of the bearing, where the lubricating oil flow path is shown by a dashed arrow.

[0026] List of reference numerals

[0027] 100 Squeeze film damper

[0028] 101 Oil film cavity

[0029] 1 Outer ring of the squeeze film damper

[0030] 2 Oil inlet

[0031] 21 First step portion

[0032] 22 Second step portion

[0033] 3 Lip seal

[0034] 31, 31’ Lapping portion

[0035] 310, 310’ Channel

[0036] 311, 311’ First lapping piece

[0037] 3110, 3110’ Surface of the first lapping piece

[0038] 312, 312’ Second lapping piece

[0039] 3120, 3120’ Surface of the second lapping piece

[0040] d Distance between the opposing surfaces of the first and second lapping pieces

[0041] 4 Check valve assembly

[0042] 41 Plug

[0043] 411 Plug body

[0044] 412 Boss

[0045] 42 Spring

[0046] 200 Bearing

[0047] 201 Bearing outer ring

[0048] 300 Rotating shaft

[0049] 400 fulcrum

[0050] 500 intermediate casing

[0051] 600 fan blade

[0052] 700 squirrel-cage elastic support

[0053] X-axis direction

[0054] Y-radial direction

[0055] L1 force transmission path

[0056] L2 lubricating oil flow path of oil inlet

[0057] L3 lubricating oil flow path of oil sealing ring

[0058] F(t) external impact force

[0059] F1(t) oil film pressure

[0060] F2(t) bearing outer ring pressure Detailed implementation manners

[0061] The following elaboration of the specific implementation manners of the present invention refers to the accompanying drawings, which show specific embodiments in which the present invention can be practiced. The embodiments are intended to describe all aspects of the present invention in sufficient detail so that those skilled in the art can implement the present invention. Without departing from the scope of the present invention, other embodiments can be utilized and changes can be made. Therefore, the following elaboration of the specific implementation manners should not be considered restrictive. The scope of the present invention is defined only by the appended claims and the full scope of equivalents covered by the claims. The same reference numerals are used to refer to the same or similar components in all the drawings and specific implementation manners.

[0062] In this article, orientation terms such as "upper", "lower", "top", "bottom", "radial", "axial", etc. are relative to Figure 2 the placement position of the squeeze film damper 100 therein (i.e., the working position installed in the engine) as a reference corresponding orientation. Specifically, "radial" refers to the radial direction Y of the rotating shaft 300, and "axial" refers to the axial direction X of the rotating shaft 300.

[0063] Figure 2The figure as a whole shows a cross-sectional view taken along the axial direction X of the squeeze film damper 100 according to a preferred embodiment of the present invention, assembled with the rotating shaft 300 and the bearing 200. As shown, the squeeze film damper 100 is sleeved on the bearing 200. Specifically, the outer ring 1 of the squeeze film damper of the squeeze film damper 100 is in clearance fit with the outer ring 201 of the bearing 200. In addition to the outer ring 1 of the squeeze film damper, the squeeze film damper 100 further includes an oil inlet 2 provided in the outer ring 1 of the squeeze film damper, a pair of oil sealing rings 3 disposed between the outer ring 1 of the squeeze film damper and the outer ring 201 of the bearing, and a check component 4 provided in the oil inlet 2. Among them, the oil film cavity 101 is defined by the oil sealing rings 3, the outer ring 1 of the squeeze film damper and the outer ring of the bearing. Preferably, a part of the pair of oil sealing rings 3 is embedded in a groove formed on the surface of the outer ring 201 of the bearing. Additionally, a squirrel-cage elastic support 700 is also provided to provide a centering function for the squeeze film damper 100, ensuring that the lubricating oil is evenly distributed in the oil film cavity 101. The width of the oil film cavity 101 in the radial direction Y is preferably 0.1 mm, but other suitable dimensions can also be contemplated.

[0064] The oil inlet 2 is preferably formed as a multi-segment cylindrical shape. As Figure 3 and Figure 4 shown, the inner surface of the oil inlet 2 sequentially forms a second step portion 22 and a first step portion 21 from top to bottom in the radial direction Y, so that the oil inlet 2 forms a cylindrical shape with three different diameters. The diameters of the three segments gradually decrease along the direction from the second step portion 22 to the first step portion 21. In other words, the cross-sectional shape of the oil inlet 2 in the X-Y plane direction is similar to a "T" shape. The oil inlet 2 is located at the bottom of the outer ring 1 of the squeeze film damper and radially penetrates the outer ring 1 of the squeeze film damper to communicate with the oil film cavity 101.

[0065] A check component 4 is provided inside the oil inlet 2. The check component includes a plug 41 and a spring 42. The plug 41 includes a plug body 411 and a boss 412, and is generally formed as a cylindrical structure in a T shape. The spring 42 abuts against the plug 41 and the oil inlet 2 respectively. Specifically, the spring 42 abuts against the boss 412 of the plug 41 at its upper end and abuts against the first step portion 21 of the oil inlet 2 at its lower end. In this way, the plug 41 is suspended in the oil inlet 2 under the supporting action of the spring 42 without contacting any inner surface of the oil inlet. Since the oil inlet 2 is in the lower part of the squeeze film damper 100, the check component 4 can be stably placed at the first step portion 21 of the oil inlet 2 by means of gravity without the need to additionally provide a positioning device. The boss 412 of the plug 41 is sized to be able to partially overlap with the second step portion 22 of the oil inlet 2, so that the boss 412 can abut against the second step portion 22 in some cases to block the oil inlet 2. Preferably, the length of the plug body 411 in the Y direction is less than the length of the compressed spring 42 to ensure the smooth flow path of the lubricating oil.

[0066] The plug 41 can move between a flow-through position and a blocking position. When the engine is operating normally, the plug 41 is in the flow-through position, as Figure 3 shown. At this time, the plug 41 is supported by the spring 42 and suspended in the oil inlet 2, and there is a gap between the plug 41 and the outer ring 201 of the bearing. Preferably, the upper surface of the boss 412 of the plug 41 is flush with the surface of the outer ring 1 of the squeeze film damper that faces the surface of the outer ring 201 of the bearing, so that the oil film cavity 101 is not blocked and does not affect the flow of lubricating oil therein. Still as Figure 3 shown, the lubricating oil flows into the oil film cavity 101 from the oil inlet along the flow path L2 to achieve the damping and vibration reduction function.

[0067] When the engine is subjected to an impact load, the plug 41 is in the blocking position, as Figure 4 shown. The impact load F(t) is transmitted through the rotating shaft 300 and the bearing 200 (especially the outer ring 201 of the bearing) to the lubricating oil in the oil film cavity 101, so that the lubricating oil at the oil inlet 2 exerts a vertically downward oil pressure, i.e., the oil film pressure F1(t), on the boss 412 of the plug 41. When the oil film pressure F1(t) is greater than a threshold value, i.e., the elastic support limit of the spring 42, the spring 42 is compressed by the force, and the plug 41 moves downward until the boss 412 abuts against the second step portion 22 of the oil inlet 2. At this point, the plug 41 blocks the oil inlet 2 and prevents any lubricating oil from entering or leaving the oil inlet 2. When the peak value of the impact load F(t) passes and the oil film pressure F1(t) decreases over time to less than the elastic support limit of the spring 42, the spring 42 begins to exert an elastic force upward, driving the plug 41 to reset upward until it moves back to Figure 3 the flow-through position shown. At this time, the lubricating oil can re-enter the oil film cavity through the oil inlet 2 along the flow path L2. In this way, the lubricating oil is relatively stably held in the oil film cavity 101, ensuring that the damping performance of the squeeze film damper 100 is not significantly affected by the impact load and reduced or even lost.

[0068] As Figure 2 and Figures 5 to 8As shown, a pair of oil sealing rings 3 are provided to confine the lubricating oil within the oil film chamber 101. Additionally, a passage 310 is provided within the oil sealing ring 3 to allow the lubricating oil to pass through. In this way, under normal engine operating conditions, i.e., when the plug 41 is in the flow-through position, the lubricating oil can enter through the oil inlet 2 and fill the oil film chamber 101 to form an oil film, and flow out of the oil film chamber 101 via the passage 310, thereby ensuring the fluidity of the lubricating oil within the oil film chamber 101 and carrying away the heat within the oil film chamber 101 of the squeeze film damper 100. Specifically, at least one (preferably two) of the oil sealing rings 3 has an overlapping portion 31, and the overlapping portion 31 includes stacked first and second overlapping pieces 311 and 312 that can move relative to each other, such that the size of the oil sealing ring 3 can be temporarily changed to facilitate fitting and installing the oil sealing ring 3 onto the outer bearing ring 201. The opposing surfaces of the first overlapping piece 311 and the second overlapping piece 312 are spaced apart by a certain distance to form a passage for the lubricating oil to pass through.

[0069] Specifically, Figure 6 A first embodiment of the overlapping portion 31 is shown, where the lower surface 3110 of the first overlapping piece 311 faces and is spaced apart from the upper surface 3120 of the second overlapping piece 312 by a distance d, preferably 0.1 mm, to form a passage 310 that is zigzag-shaped in a cross-section along the axial direction X. In this first embodiment, the passage 310 is formed in a sawtooth shape. In Figure 7 In the second embodiment of the overlapping portion 31' shown, the passage 310' is formed in a concave-convex shape. Of course, the present invention is not limited thereto, and other alternative embodiments may also envision zigzag shapes such as a wavy shape.

[0070] As described above, when the engine is operating normally and the plug 41 is in the flow-through position, the lubricating oil flows through the oil inlet 2 and the passage 310 / 310' in the oil sealing ring 3 within the oil film chamber 101 to form a dynamic equilibrium; when the engine is subjected to an impact load and the plug 41 is in the blocked position, as Figure 9As shown, the outer bearing ring 201 is subjected to a pressure F2(t), which applies a pressure to the oil seal ring 3 and the lubricating oil (oil film) in the oil film chamber 101, causing the lubricating oil to flow out of the oil seal ring 3 along the tortuous flow path L3 at a flow rate lower than that of the lubricating oil flowing out of the oil seal ring along a straight flow path. Therefore, the channels 310 / 310' reduce the flow rate of the lubricating oil and extend the lubricating oil discharge time due to their wavy shape, thereby effectively delaying the time when all the lubricating oil flows out of the oil film chamber 101 during the period when the plug 41 is held in the blocked position. Since the action time of the impact load F(t) is short, the plug 41 will be reset by the spring 42 before all the lubricating oil flows out of the oil film chamber 101, allowing the lubricating oil to re-enter and fill the oil film chamber 101 through the oil inlet 2. Thus, the present invention combines the tortuous channels 310 with the check assembly 4 to ensure that even when the engine is subjected to an impact load, a certain amount of lubricating oil always remains in the oil film chamber 101, effectively protecting the damping performance of the squeeze film damper 101.

[0071] As Figure 8 shown, the shape of the cross-section of the oil seal ring 3 in the axial direction X in the preferred embodiment is rectangular. However, other suitable shapes such as circular, elliptical, polygonal, etc. can also be envisaged in alternative embodiments, as long as they can effectively define the oil film chamber 101 and confine the lubricating oil within the oil film chamber 101.

[0072] The squeeze film damper according to the present invention is provided with an oil inlet having a plurality of stepped portions and a check assembly having a spring and a plug with a boss, wherein the boss of the plug can abut against one of the stepped portions of the oil inlet to block the oil inlet. In this way, when the engine is operating normally, the spring and the plug rest on the stepped portion of the oil inlet under the action of gravity without blocking the oil inlet. When the engine is subjected to an impact load, the plug can be pressed downward against the spring to block the oil inlet, thereby allowing the lubricating oil to circulate in the oil film chamber during normal operation and preventing a large amount of lubricating oil from spraying out through the oil inlet during abnormal impacts, thus solving the problem in the prior art that the lubricating oil in the oil film chamber is easily sprayed out of the oil film chamber under an impact load, causing the squeeze film damper to lose its damping performance.

[0073] As used herein, the terms "comprising", "including", "having" or any other variation thereof are intended to cover non-exclusive inclusion. For example, a method, article or device comprising a series of elements is not necessarily limited to those elements, but may also include other elements not expressly listed or inherent to such method, article or device.

[0074] The present invention is not limited to the above embodiments, and the above embodiments are merely illustrative rather than restrictive. Those skilled in the art, under the inspiration of the present invention and without departing from the spirit of the present invention and the scope protected by the claims, can make any possible changes and modifications. Therefore, all modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention fall within the protection scope defined by the claims of the present invention.

Claims

1. An squeeze film damper, the squeeze film damper is arranged at a bearing, comprising: An outer ring of the squeeze film damper, the outer ring of the squeeze film damper is sleeved on the outer ring of the bearing, and an oil inlet is provided through the outer ring of the squeeze film damper; and A pair of oil sealing rings, the pair of oil sealing rings are arranged between the outer ring of the squeeze film damper and the outer ring of the bearing; The outer ring of the squeeze film damper, the outer ring of the bearing and the pair of oil sealing rings surround and define an oil film cavity; wherein, a check component is arranged inside the oil inlet, the check component includes a plug and a spring, the spring abuts against the plug and the oil inlet respectively, the plug can move between a through-flow position and a blocking position, when the oil pressure in the oil film cavity exceeds a threshold value, the plug enters the blocking position from the through-flow position, in the through-flow position, the plug does not block the oil inlet, allowing lubricating oil to enter the oil film cavity through the oil inlet; in the blocking position, the plug blocks the oil inlet, preventing lubricating oil from entering and leaving the oil inlet.

2. The squeeze film damper according to claim 1, characterized in that, A first step portion is formed on the inner surface of the oil inlet, the plug has a plug body and a convex platform, the spring is sleeved on the plug body, and abuts against the first step portion of the oil inlet at the lower end and the convex platform at the upper end.

3. The squeeze film damper according to claim 2, characterized in that, The oil inlet further includes a second step portion, wherein the second step portion is above the first step portion, and wherein the diameter of the oil inlet gradually decreases along the direction from the second step portion to the first step portion.

4. The squeeze film damper according to claim 1, characterized in that, The oil inlet is located at the bottom of the outer ring of the squeeze film damper and radially penetrates the outer ring of the squeeze film damper.

5. The squeeze film damper according to claim 3, characterized in that, in the blocking position, the convex platform of the plug abuts against the second step portion of the oil inlet.

6. The squeeze film damper according to claim 1, characterized in that, The size of the plug is designed such that when the plug is in the through-flow position, there is a gap between the plug and the outer ring of the bearing.

7. The squeeze film damper according to claim 1, characterized in that, At least one of the oil sealing rings has a lapping portion, the lapping portion includes a first lapping piece and a second lapping piece which are stacked and can move relative to each other, wherein, the opposite surfaces of the first lapping piece and the second lapping piece are spaced apart by a certain distance to form a channel.

8. The squeeze film damper according to claim 7, characterized in that, In a cross-section along the axial direction, the channel is in a wavy shape.

9. The squeeze film damper according to claim 8, characterized in that, The wavy shape includes a zigzag shape or a concave-convex shape.

10. The squeeze film damper according to any one of claims 7 to 9, characterized in that, The distance between the opposite surfaces is 0.1 millimeter.

11. The squeeze film damper according to claim 1, characterized in that, A part of the oil sealing ring is embedded in a groove formed on the surface of the outer bearing ring, wherein the cross section of the oil sealing ring is rectangular.

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