Vibration reduction and isolation bearing supporting structure of transmission shaft system of water surface ship

Abstract

The vibration reduction and isolation bearing supporting structure comprises a bearing mounting sleeve, a vibration reduction and isolation layer, a supporting fixing ring, a vibration suppression adjusting layer and a limiting strip. A plurality of groups of strip-shaped bosses are uniformly arranged on the peripheral wall of the bearing mounting sleeve at intervals, and a space groove is formed between every two adjacent strip-shaped bosses; each vibration reduction and isolation layer is fixed on one group of strip-shaped bosses; the inner circumferential wall of the supporting and fixing ring is fixed to the multiple vibration reduction and isolation layers. Each vibration suppression adjusting layer is arranged between one vibration reduction and isolation layer and the supporting and fixing ring; each limiting strip is arranged in one space groove, the outer end of each limiting strip is fixedly connected with the supporting and fixing ring, and the inner end of each limiting strip extends in the radial direction of the transmission shaft; the vibration reduction and isolation layer sequentially comprises an inner-layer low-frequency vibration reduction and isolation layer, a middle-layer medium-frequency vibration reduction and isolation layer and an outer-layer high-frequency vibration reduction and isolation layer from inside to outside in the radial direction of the transmission shaft. The radial vibration attenuation of the transmission shaft of the water surface ship can be effectively realized on the basis of keeping the overall structure stable.

Description

Technical Field

[0001] This application relates to the field of ship vibration control technology, and in particular to a vibration damping and isolation bearing support structure for a surface ship's drive shaft system. Background Technology

[0002] The vibrations generated by the rotation of the drive shaft system during the navigation of a surface vessel are transmitted to the hull structure through the shaft support, causing hull plate vibration and underwater radiated noise with a characteristic spectrum. This characteristic signal is very easy for enemy sonar systems to detect, thus directly affecting the stealth performance of the equipment. At the same time, the generated near-field self-noise will also interfere with the sonar system of the equipment, affecting its own detection capability.

[0003] The path of transmission shaft vibration transmitted through the shaft support can be suppressed by rationally designing the vibration reduction and isolation bearing support structure. Currently, the publicly available technologies generally have the following problems: First, traditional rubber vibration isolation methods have a relatively limited vibration isolation frequency, making it difficult to cover the higher frequency band of shaft vibration; second, traditional vibration isolation methods are prone to large deformation when the hull is subjected to sudden impact loads (such as transmission system vibration under harsh working conditions or sudden and drastic changes in main engine speed, which can affect shaft alignment); third, some active vibration isolation methods are generally not very practical due to space limitations and the influence of complex marine environments.

[0004] Therefore, we propose a bearing support structure for reducing vibration and isolating the transmission shaft system of surface ships.

[0005] Application content

[0006] In response to the shortcomings of the existing production technology, the applicant provides a vibration damping bearing support structure for the drive shaft system of a surface vessel, which can effectively reduce radial vibration of the drive shaft while maintaining overall structural stability.

[0007] The technical solution adopted in this application is as follows:

[0008] A vibration damping and isolation bearing support structure for a surface vessel's drive shaft system includes:

[0009] A bearing mounting sleeve has a bearing fixed to its inner circumferential wall, and the bearing is fixed to a drive shaft; the outer circumferential wall of the bearing mounting sleeve is provided with multiple sets of strip-shaped protrusions at even intervals, and a spatial groove is formed between adjacent strip-shaped protrusions.

[0010] Multiple vibration damping and isolation layers, each of which is fixed to a set of strip-shaped protrusions;

[0011] A support and fixing ring, the inner peripheral wall of which is fixed to multiple vibration damping and isolation layers;

[0012] Multiple vibration damping and adjustment layers, each of which is disposed between a vibration damping and isolation layer and a support fixing ring;

[0013] Multiple limit bars;

[0014] Each space groove contains a limiting strip, the outer end of which is fixedly connected to the support fixing ring, and the inner end of which extends radially along the drive shaft.

[0015] The vibration damping and isolation layer consists of an inner low-frequency vibration damping and isolation layer, a middle medium-frequency vibration damping and isolation layer, and an outer high-frequency vibration damping and isolation layer, arranged radially from the inside to the outside along the drive shaft.

[0016] The bearing mounting sleeve, vibration damping layer, vibration damping and adjustment layer, limit strip, and support fixing ring have the same axial length and completely cover the bearing.

[0017] Its further features are:

[0018] The inner surface of the inner low-frequency vibration damping and isolation layer is provided with a trapezoidal protrusion that matches the trapezoidal groove of the strip-shaped boss. The trapezoidal protrusion of the inner low-frequency vibration damping and isolation layer can completely fit with the trapezoidal groove of the strip-shaped boss.

[0019] The inner low-frequency vibration damping layer is made of silicone rubber.

[0020] The middle-layer mid-frequency vibration damping and isolation layer is a composite strip structure with high-damping alloy steel wire braided reinforcement and high-damping rubber as the matrix. The width of the middle-layer mid-frequency vibration damping and isolation layer is the same as the width of the inner low-frequency vibration damping and isolation layer. The loss factor of the high-damping rubber is greater than 0.6.

[0021] The outer high-frequency vibration damping layer is made of porous polyurethane foam material with a porosity of at least 75%.

[0022] The maximum thickness of the inner low-frequency vibration damping layer in the radial direction of the drive shaft is at least 1.5 times the thickness of the support fixing ring.

[0023] The vibration damping and regulating layer is a long box-shaped structure made of high-damping alloy steel, and the inside of the long box-shaped structure is filled with a high-viscosity fluid material.

[0024] The inner end of the limit bar is 0.1mm-0.15mm away from the outer circumference of the bearing mounting sleeve.

[0025] The limiting strip is an I-shaped long strip structure made of glass fiber reinforced epoxy resin composite material, and the glass fiber density of the limiting strip gradually increases from the inside to the outside along the radial direction of the drive shaft.

[0026] The bearing mounting sleeve is fixed with a front end cover and a rear end cover at both ends, a shaft bracket is fixed to the outside of the support ring, and a flow guide is fixed to both ends of the support ring.

[0027] The beneficial effects of this application are as follows:

[0028] This application features a compact and rational structure, and is easy to operate. The vibration damping layer fully utilizes the innovative synergistic design of the structural configuration and composite damping materials, effectively attenuating the radial vibration of the shaft system across a wide frequency band, including low, mid, and high frequencies. Low-frequency radial vibration of the drive shaft is transmitted to the inner low-frequency vibration damping layer through the bearing mounting sleeve. Utilizing the high damping characteristics of silicone rubber, vibration energy is dissipated through shear deformation, thus reducing the transmission of low-frequency vibration. Mid-frequency radial vibration of the drive shaft is attenuated through the elastic deformation of the high-damping alloy steel wire braided reinforcement in the composite strip structure, the damping dissipation of the high-damping rubber, and the coupling constraint effect between the two different materials. When high-frequency radial vibration waves are transmitted to the drive shaft, they are continuously reflected and scattered within the outer high-frequency vibration damping layer formed by porous polyurethane foam. The high-frequency vibration energy is effectively absorbed through the viscoelastic effect of the porous polyurethane foam.

[0029] In addition, this application also has the following advantages:

[0030] (1) The vibration damping adjustment layer incorporates a damping adjustment structure design combining high-damping alloy steel and viscous fluid. This structure can adjust the damping characteristics according to the vibration amplitude, thereby improving the effectiveness of the overall vibration reduction and isolation system under impact loads. When the vibration amplitude exceeds a certain design value, the high-damping alloy steel undergoes structural deformation and simultaneously compresses the high-viscosity fluid within the inner cavity. This significantly enhances the overall structural model and damping characteristics, thereby improving the effectiveness of the overall vibration reduction and isolation system under impact loads.

[0031] (2) The limiting strip introduces a composite structure design with gradually changing density and elastic modulus. When the drive shaft is working normally, it does not affect the vibration isolation effect. However, when it is subjected to impact load and the vibration amplitude is large, the gradually changing stiffness of the limiting strip causes the internal radial energy to be gradually dissipated, which limits the displacement of the drive shaft. The limiting strip takes into account the coordination between structural stability and vibration isolation performance, ensuring the safety of drive shaft alignment. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this application.

[0033] Figure 2 This is a partial structural diagram of this application.

[0034] Figure 3 This is a partial cross-sectional schematic diagram of this application.

[0035] Among them: 10, drive shaft; 20, bearing; 30, bearing mounting sleeve; 40, vibration damping layer; 50, vibration damping and adjustment layer; 60, limiting strip; 70, support fixing ring; 80, front end cover; 90, rear end cover; 100, flow guide; 110, shaft bracket;

[0036] 31. Strip-shaped boss; 32. Spatial groove;

[0037] 41. Inner low-frequency vibration damping and isolation layer; 42. Middle medium-frequency vibration damping and isolation layer; 43. Outer high-frequency vibration damping and isolation layer. Detailed Implementation

[0038] The specific embodiments of this application are described below with reference to the accompanying drawings.

[0039] like Figures 1-3 As shown, a vibration damping and isolation bearing support structure for a water surface ship's drive shaft system includes a bearing mounting sleeve 30, a vibration damping and isolation layer 40, a vibration damping and adjustment layer 50, a limiting strip 60, a support fixing ring 70, a front end cover 80, a rear end cover 90, a flow guide 100, and a shaft bracket 110.

[0040] In one embodiment, both the bearing mounting sleeve 30 and the support retaining ring 70 are provided.

[0041] A bearing 20 is fixed to the inner peripheral wall of the bearing mounting sleeve 30, and the bearing 20 is fixed to the drive shaft 10. Multiple sets of strip-shaped protrusions 31 are evenly spaced on the outer peripheral wall of the bearing mounting sleeve 30, and a spatial groove 32 is formed between adjacent strip-shaped protrusions 31. A trapezoidal groove is opened on the outer surface of each strip-shaped protrusion 31 for fixing the vibration damping layer 40.

[0042] Each strip-shaped protrusion 31 is equipped with a vibration damping and isolation layer 40 on its outer side. The vibration damping and isolation layer 40 includes, from the inside to the outside, an inner low-frequency vibration damping and isolation layer 41, a middle medium-frequency vibration damping and isolation layer 42, and an outer high-frequency vibration damping and isolation layer 43 along the radial direction of the drive shaft 10.

[0043] Each inner low-frequency vibration damping and isolation layer 41 has a trapezoidal protrusion on its inner surface that matches the trapezoidal groove of the strip-shaped boss 31. The trapezoidal protrusion of the inner low-frequency vibration damping and isolation layer 41 can completely fit into the trapezoidal groove of the strip-shaped boss 31. The two sides of the trapezoidal protrusion of the inner low-frequency vibration damping and isolation layer 41 are attached and connected to the two sides of the strip-shaped boss 31. The inner low-frequency vibration damping and isolation layer 41 is made of silicone rubber.

[0044] In one embodiment, the maximum thickness of the inner low-frequency vibration damping layer 41 in the radial direction of the drive shaft 10 is at least 1.5 times the thickness of the support fixing ring 70.

[0045] The radial low-frequency vibration of the drive shaft 10 is transmitted to the inner low-frequency vibration damping layer 41 through the bearing mounting sleeve 30. The high damping characteristics of the silicone rubber material are used to dissipate the vibration energy through shear deformation, thereby reducing the transmission of low-frequency vibration.

[0046] The middle-layer mid-frequency vibration damping and isolation layer 42 is a composite strip structure with a high-damping alloy steel wire braided reinforcement and a high-damping rubber matrix with a loss factor greater than 0.6. The width of the middle-layer mid-frequency vibration damping and isolation layer 42 is the same as the width of the inner low-frequency vibration damping and isolation layer 41. The middle-layer mid-frequency vibration damping and isolation layer 42 and the inner low-frequency vibration damping and isolation layer 41 are fixedly connected.

[0047] The radial mid-frequency vibration of the drive shaft 10 is attenuated by the elastic deformation of the high-damping alloy steel wire braided reinforcement in the composite strip structure, the damping dissipation of the high-damping rubber, and the coupling constraint effect between the two different materials.

[0048] The outer high-frequency vibration damping and isolation layer 43 is made of porous polyurethane foam material with a porosity of at least 75%. The inner side of the outer high-frequency vibration damping and isolation layer 43 is fixedly connected to the middle medium-frequency vibration damping and isolation layer 42 by adhesive bonding, and the outer side of the outer high-frequency vibration damping and isolation layer 43 is bonded to the vibration damping and adjustment layer 50 and the support fixing ring 70.

[0049] When the radial high-frequency vibration wave of the drive shaft 10 is transmitted, it is continuously reflected and scattered within the outer high-frequency vibration damping layer 43 formed by porous polyurethane foam material. The high-frequency vibration energy is effectively absorbed through the viscoelastic effect of the porous polyurethane foam material.

[0050] The inner peripheral wall of the support fixing ring 70 has a fully fitting arc-shaped groove corresponding to the outer surface of each outer high-frequency vibration damping and isolation layer 43. Each outer high-frequency vibration damping and isolation layer 43 is embedded and fixed in the arc-shaped groove. The outer surface of the outer high-frequency vibration damping and isolation layer 43 is provided with a groove, and the vibration damping adjustment layer 50 is disposed between the groove and the arc-shaped groove of the support fixing ring 70.

[0051] The vibration damping adjustment layer 50 is a long box-shaped structure made of high-damping alloy steel, with a high-viscosity fluid material filling the interior. This damping adjustment layer 50, a composite structure of high-damping alloy steel and viscous fluid, can adjust its damping characteristics according to the vibration amplitude. When the vibration amplitude exceeds a certain design value, the high-damping alloy steel undergoes structural deformation, simultaneously compressing the high-viscosity fluid within the cavity. This significantly improves the overall structural model and damping characteristics, enhancing the effectiveness of the overall vibration reduction and isolation system under impact loads.

[0052] The number of strip-shaped protrusions 31, vibration damping and isolation layer 40, and vibration suppression and adjustment layer 50 are the same.

[0053] The number of space grooves 32 and limit bars 60 are the same.

[0054] Each space groove 32 is provided with a limiting strip 60, which extends radially. The outer end of the limiting strip 60 is bonded to the inner wall of the support fixing ring 70, and the inner end of the limiting strip 60 is 0.1mm-0.15mm away from the outer peripheral wall of the bearing mounting sleeve 30.

[0055] The bearing mounting sleeve 30, vibration damping layer 40, vibration damping and adjustment layer 50, limiting strip 60, and support fixing ring 70 have the same axial length and completely cover the bearing 20.

[0056] The limiting strip 60 is an I-shaped long strip structure made of glass fiber reinforced epoxy resin composite material. Along the radial direction of the drive shaft 10, the glass fiber density gradually increases from the inside to the outside, and the elastic modulus can cover between 25Gpa and 75Gpa. The limiting strip 60 is a composite structure with gradually changing density and elastic modulus. When the drive shaft 10 is operating normally, it does not affect the vibration isolation effect. However, when subjected to impact loads and experiencing large vibration amplitudes, the gradually changing stiffness of the limiting strip 60 causes gradual energy dissipation along the radial direction, limiting the displacement of the drive shaft 10. The limiting strip 60 balances structural stability and vibration isolation performance, ensuring the safe alignment of the drive shaft 10.

[0057] The front cover 80 and the rear cover 90 are screwed to both ends of the bearing mounting sleeve 30; a shaft bracket 110 is fixed to the outside of the support fixing ring 70, and a flow guide shroud 100 is fixed to both ends of the support fixing ring 70.

[0058] In one embodiment, the inner circumferential wall of the bearing mounting sleeve 30 is machined into a high-precision arc surface and is fixedly connected to the outer ring of the bearing 20, while the inner ring of the bearing 20 is fixedly connected to the drive shaft 10.

[0059] In one embodiment, bearing 20 is a Sailong bearing.

[0060] In one embodiment, eight sets of strip-shaped protrusions 31 are provided, and eight sets of corresponding spatial grooves 32 are also provided.

[0061] In one embodiment, the inner low-frequency vibration damping layer 41 is bonded to the strip-shaped boss 31 and the trapezoidal groove of the strip-shaped boss 31 by a vulcanization process.

[0062] In one embodiment, the middle-layer mid-frequency vibration damping and isolation layer 42 is connected to the inner-layer low-frequency vibration damping and isolation layer 41 by two rows of axial bolts.

[0063] The vibration damping and isolation layer 40 makes full use of the innovative synergistic design of the structural configuration and composite damping materials, which can effectively attenuate the radial vibration of the shaft system in a wide frequency band, including low frequency, mid frequency and high frequency.

[0064] The vibration damping adjustment layer 50 incorporates a damping adjustment structure design that combines high-damping alloy steel with viscous fluid. This allows for adjustment of damping characteristics based on vibration amplitude, thereby improving the effectiveness of the overall vibration reduction and isolation system under impact loads.

[0065] The limiting strip 60 incorporates a composite structure design with gradually varying density and elastic modulus, taking into account the coordination between structural stability and vibration isolation performance, thus ensuring the safety of shaft alignment.

[0066] The above description is an explanation of this application and not a limitation thereof. The scope of this application is defined by the claims. Within the scope of protection of this application, any form of modification may be made.

Claims

1. A vibration damping and isolation bearing support structure for a surface vessel's drive shaft system, characterized in that, include: A bearing mounting sleeve (30) has a bearing (20) fixed on its inner peripheral wall, and the bearing (20) is fixed on the drive shaft (10); the outer peripheral wall of the bearing mounting sleeve (30) is provided with multiple sets of strip-shaped protrusions (31) evenly spaced, and a spatial groove (32) is formed between adjacent strip-shaped protrusions (31); Multiple vibration damping and isolation layers (40), each vibration damping and isolation layer (40) is fixed on a set of strip-shaped bosses (31); A support and fixing ring (70) has its inner peripheral wall fixed to multiple vibration damping and isolation layers (40); Multiple vibration damping adjustment layers (50), each vibration damping adjustment layer (50) is disposed between a vibration damping and isolation layer (40) and a support fixing ring (70); Multiple limit bars (60); In each of the space grooves (32), a limiting strip (60) is arranged. The outer end of the limiting strip (60) is fixedly connected to the support fixing ring (70), and the inner end of the limiting strip (60) extends radially along the drive shaft (10). The vibration damping and isolation layer (40) includes, from the inside to the outside, an inner low-frequency vibration damping and isolation layer (41), a middle medium-frequency vibration damping and isolation layer (42), and an outer high-frequency vibration damping and isolation layer (43) along the radial direction of the transmission shaft (10); The bearing mounting sleeve (30), vibration damping layer (40), vibration damping adjustment layer (50), limiting strip (60), and support fixing ring (70) have the same axial length and completely cover the bearing (20).

2. The vibration damping and isolation bearing support structure for a surface vessel drive shaft system as described in claim 1, characterized in that: The inner low-frequency vibration damping layer (41) has a trapezoidal protrusion on its inner side that matches the trapezoidal groove of the strip protrusion (31). The trapezoidal protrusion of the inner low-frequency vibration damping layer (41) can fit completely with the trapezoidal groove of the strip protrusion (31).

3. The vibration damping and isolation bearing support structure for a surface vessel drive shaft system as described in claim 1, characterized in that: The inner low-frequency vibration damping layer (41) is made of silicone rubber.

4. The vibration damping and isolation bearing support structure for a surface vessel drive shaft system as described in claim 3, characterized in that: The middle-layer mid-frequency vibration reduction and isolation layer (42) is a composite strip structure with high-damping alloy steel wire braided reinforcement and high-damping rubber as the matrix. The width of the middle-layer mid-frequency vibration reduction and isolation layer (42) is the same as the width of the inner low-frequency vibration reduction and isolation layer (41). The loss factor of the high-damping rubber is greater than 0.

6.

5. The vibration damping and isolation bearing support structure for a surface vessel drive shaft system as described in claim 4, characterized in that: The outer high-frequency vibration damping layer (43) is a porous polyurethane foam material with a porosity of at least 75%.

6. The vibration damping and isolation bearing support structure for a surface vessel drive shaft system as described in claim 1, characterized in that: The maximum thickness of the inner low-frequency vibration damping layer (41) in the radial direction of the drive shaft (10) is at least 1.5 times the thickness of the support fixing ring (70).

7. The vibration damping and isolation bearing support structure for a surface vessel drive shaft system as described in claim 5, characterized in that: The vibration damping adjustment layer (50) is a long box-shaped structure made of high-damping alloy steel, and the inside of the long box-shaped structure is filled with a high-viscosity fluid material.

8. The vibration damping and isolation bearing support structure for a surface vessel drive shaft system as described in claim 1, characterized in that: The inner end of the limiting strip (60) is 0.1mm-0.15mm away from the outer peripheral wall of the bearing mounting sleeve (30).

9. The vibration damping and isolation bearing support structure for a surface vessel drive shaft system as described in claim 1, characterized in that: The limiting strip (60) is an I-shaped long strip structure made of glass fiber reinforced epoxy resin composite material. The glass fiber density of the limiting strip (60) gradually increases from the inside to the outside along the radial direction of the transmission shaft (10).

10. The vibration damping and isolation bearing support structure for a surface vessel drive shaft system as described in claim 1, characterized in that: The bearing mounting sleeve (30) is fixed with a front end cover (80) and a rear end cover (90) at both ends, and a shaft bracket (110) is fixed on the outside of the support fixing ring (70). Both ends of the support fixing ring (70) are fixed with a flow guide (100).

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