Vibration isolation rate-adjustable bearing isolator, mounting structure thereof, and adjustment method

Abstract

The application relates to the technical field of new energy electric drive assembly NVH, and discloses a bearing vibration isolator with adjustable vibration isolation rate, which comprises a base ring, the outer surface of the base ring is provided with a plurality of blades, the blades are distributed in a spiral shape with the base ring as the center, the connecting positions of the base ring and the blades are all provided with triangular filled rubber, the outer periphery of the base ring is provided with a variable-diameter compression ring, and the blades abut against the inner wall of the compression ring. The application further discloses a mounting structure and an adjusting method of the bearing vibration isolator with adjustable vibration isolation rate. The bearing vibration isolator with adjustable vibration isolation rate, the mounting structure and the adjusting method thereof can reduce the vibration transmitted through the bearing by isolating the vibration at the bearing near the excitation source, so that the high quietness requirement of the electric drive assembly is realized.

Description

Technical Field

[0001] This invention relates to the field of NVH technology for new energy electric drive assemblies, specifically to a bearing isolator with adjustable vibration isolation rate, its installation structure, and adjustment method. Background Technology

[0002] Currently, electric drive assemblies mainly improve motor noise through harmonic injection and electromagnetic structure optimization, and gear meshing noise through gear macroscopic parameter design, gear modification, and acoustic packaging of the electric drive assembly housing. However, no actual product uses vibration isolation near the source – the bearing position – to improve electric drive assembly noise.

[0003] Taking gear meshing noise as an example, during gear meshing transmission, when the meshing stiffness between the gear teeth changes, the gear teeth will vibrate as a result, and the vibration will be transmitted to the electric drive assembly housing through the bearing, thereby causing radiated noise. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by providing a bearing vibration isolator with adjustable vibration isolation rate, its installation structure, and adjustment method. By isolating the bearing near the excitation source, the vibration transmitted through the bearing is reduced, thereby achieving the high quietness requirements of the electric drive assembly.

[0005] To achieve the above objectives, the present invention provides a bearing isolator with adjustable vibration isolation rate, comprising a base ring, wherein the outer surface of the base ring is provided with a plurality of blades, the blades being spirally distributed around the base ring, and triangular filling rubber is provided at the connection between the base ring and the blades, and a variable diameter compression ring is provided around the periphery of the base ring, with the blades abutting against the inner wall of the compression ring.

[0006] Preferably, one corner of the triangular filling rubber abuts against the connection between the blade and the base ring, and one of the two faces of this corner is connected to the outer surface of the base ring, and the other is connected to the inner wall of the blade.

[0007] Preferably, the compression ring has its inner diameter adjusted via an aperture-like mechanism. This mechanism includes a base with a base cover. The base has a groove forming a regular polygon, and the center of the groove has a base hole concentric with the compression ring. The base cover has a base cover hole concentric with the compression ring and a limiting groove with the same number of sides as the groove. One end of the limiting groove is near the base cover hole, and the other end is near the edge of the base cover, radiating outwards from the base cover hole. Each side of the groove has an aperture blade. The lower part of the aperture blade has a moving post that inserts into the groove, and the upper part of the aperture blade has a limiting post that inserts into the limiting groove. The aperture blades enclose the compression ring, and rotating the base changes the inner diameter of the compression ring.

[0008] Preferably, it further includes a worm gear with a turbine, and the edge of the base is provided with teeth that mesh with the turbine on the worm gear.

[0009] Preferably, the worm gear is a self-locking worm gear, and the worm gear is provided with an adjustment knob for driving its rotation.

[0010] An installation structure for a bearing isolator with adjustable vibration isolation rate, wherein the aperture-like mechanism is mounted on a bearing housing, the base ring is mounted inside the compression ring of the aperture-like mechanism, the blade abuts against the compression ring, and the bearing is mounted inside the base ring.

[0011] Preferably, the bearing isolator further includes a worm gear with a turbine, the edge of the base is provided with teeth, the teeth mesh with the turbine on the worm gear, and the worm gear is rotatably mounted on the housing.

[0012] An adjustment method for the bearing isolator with adjustable vibration isolation rate involves driving the base of the aperture-like mechanism to rotate, causing its compression ring to compress or expand, thereby adjusting the deformation of the blade. When the blade deforms from the basic state to the compressed state, the stiffness of the bearing isolator increases and the vibration isolation rate decreases. The greater the compression deformation, the lower the vibration isolation rate.

[0013] Preferably, the bearing isolator further includes a worm gear with a turbine, and the edge of the base is provided with teeth, which mesh with the turbine on the worm gear, so that rotating the worm gear drives the base to rotate.

[0014] Preferably, the worm gear is provided with an adjustment knob for driving its rotation, and the worm gear is rotated by rotating the adjustment knob.

[0015] The principle of this invention is as follows:

[0016] When the excitation has been generated and further optimization is no longer possible, vibration isolation near the excitation point is the most effective means. Since the vibration of the housing is mainly transmitted from the bearing, choosing to isolate the vibration at the bearing can effectively suppress the vibration.

[0017] Mathematical modeling and analysis were performed on the shaft-bearing-housing system, and the vibration isolation rate was examined.

[0018] Spring force = k(x1-x2) = k2x2

[0019] Therefore, the vibration isolation ratio = 20log(x1 / x2) = 20log(k2 / k+1)

[0020] In the formula, k is the bearing stiffness, x1 is the shaft displacement, x2 is the housing displacement, and k2 is the stiffness of the bearing mounting point on the housing. Therefore, the lower the bearing stiffness k, the higher the vibration isolation rate and the less vibration transmitted to the housing, i.e., the better the vibration isolation performance. Considering that the bearing stiffness k also affects the gear meshing excitation, the bearing stiffness k needs to be designed as an adjustable structure.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. Vibration isolation at the source will greatly improve the NVH performance of the product;

[0023] 2. By controlling the radial compression of the bearing isolator, the stiffness can be varied, making the isolation rate adjustable. This can compensate for NVH problems caused by manufacturing variations. For example, there are often tolerances in gear manufacturing, and gear meshing noise is often sensitive to the manufacturing tolerances of gears. Controlling variations is both a requirement and a challenge. When the isolation rate is adjustable, it means that corresponding adjustments can be made to each electric drive assembly to ensure the NVH robustness of the product and bring a better customer experience. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the bearing vibration isolator with adjustable vibration isolation rate according to the present invention.

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the base ring and blade;

[0026] Figure 3 This is a schematic diagram of the blade in its basic state.

[0027] Figure 4 This is a schematic diagram of the blades under compression.

[0028] Figure 5 This is a schematic diagram of the installation of the bearing vibration isolator with adjustable vibration isolation rate according to the present invention.

[0029] Figure 6This is a schematic diagram of the aperture-type mechanism in this invention;

[0030] Figure 7 for Figure 6 Schematic diagram of the middle base;

[0031] Figure 8 for Figure 6 Schematic diagram of the structure of the mid-aperture blade;

[0032] Figure 9 This is a schematic diagram showing how the inner diameter of the compression ring increases after the aperture-type mechanism moves.

[0033] Figure 10 This is a schematic diagram of the structure of the base and worm gear assembly.

[0034] The components in the diagram are labeled as follows:

[0035] 1. Base ring, 2. Aperture mechanism, 3. Blade, 4. Triangular filling rubber, 5. Base, 6. Compression ring, 7. Turbine, 8. Worm, 9. Gear, 10. Adjustment knob, 11. Bearing seat, 12. Housing, 13. Bearing, 14. Base cover, 15. Groove, 16. Base hole, 17. Base cover hole, 18. Limiting groove, 19. Aperture blade, 20. Moving post, 21. Limiting post. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figure 1 and Figure 2 As shown, a bearing vibration isolator with adjustable vibration isolation rate includes a base ring 1. The outer surface of the base ring 1 is provided with a plurality of blades 3. The blades 3 are spirally distributed around the base ring 1. Triangular filling rubber 4 is provided at the connection between the base ring 1 and the blades 3. A variable diameter compression ring 6 is provided around the base ring 1. The blades 3 abut against the inner wall of the compression ring 6.

[0039] The stiffness variation range of the bearing isolator is determined by the hardness and filling amount of the triangular filler rubber 4, the material and number of blades 3 and their angle with the outer surface of the base ring 1, and the diameter variation of the compression ring 6.

[0040] In this embodiment, the deformation of the blade 3 is adjusted by compressing or expanding the compression ring 6, such as... Figure 3 and Figure 4 As shown, when blade 3 deforms from the basic state to the compression state, the stiffness of the bearing isolator increases and the vibration isolation rate decreases. The greater the compression deformation, the lower the vibration isolation rate.

[0041] Example 2

[0042] like Figure 1 and Figure 2 As shown, a bearing vibration isolator with adjustable vibration isolation rate includes a base ring 1. The outer surface of the base ring 1 is provided with a plurality of blades 3. The blades 3 are spirally distributed around the base ring 1. Triangular filling rubber 4 is provided at the connection between the base ring 1 and the blades 3. One corner of the triangular filling rubber 4 abuts against the connection between the blade 3 and the base ring 1. One of the two faces on this corner is connected to the outer surface of the base ring 1, and the other is connected to the inner wall of the blade 3. A variable diameter compression ring 6 is provided around the base ring 1, and the blades 3 abut against the inner wall of the compression ring 6.

[0043] The stiffness variation range of the bearing isolator is determined by the hardness and filling amount of the triangular filler rubber 4, the material and number of blades 3 and their angle with the outer surface of the base ring 1, and the diameter variation of the compression ring 6.

[0044] In addition, combined Figure 6 , Figure 7 , Figure 8 As shown, the inner diameter of the compression ring 6 is adjusted by the aperture mechanism 2. The aperture mechanism 2 includes a base, a base cover 14 on the base 5, a groove 15 forming a regular polygon on the base 5, a base hole 16 with the same center as the compression ring 6 in the center of the groove 15, a base cover hole 17 with the same center as the compression ring 6 on the base cover 14, and a limiting groove 18 with the same number of sides as the groove 15 on the base cover 14. One end of the limiting groove 18 is close to the base cover hole 17, and the other end is close to the edge of the base cover 14, and they are arranged diverging along the base cover hole 17. Each side of the groove 15 is provided with an aperture blade 19. The lower part of the aperture blade 19 is provided with a moving post 20 that inserts into the groove 15, and the upper part of the aperture blade 19 is provided with a limiting post 21 that inserts into the limiting groove 18. The aperture blade 19 surrounds and forms the compression ring 6. Rotating the base 5 changes the size of the inner diameter of the compression ring 6.

[0045] During installation, the aperture mechanism 2 is mounted on the bearing housing 11, the base ring 1 is mounted inside the compression ring 6 of the aperture mechanism 2, the blade 3 abuts against the compression ring 6, and the bearing 13 is mounted inside the base ring 1.

[0046] In use, the base 5 of the driving aperture mechanism 2 rotates, combined with... Figure 9 As shown, the compression ring 6 is compressed or expanded, thereby adjusting the deformation of the blade 3. When the blade 3 is deformed from the basic state to the compressed state, the stiffness of the bearing isolator increases and the vibration isolation rate decreases. The greater the compression deformation, the lower the vibration isolation rate.

[0047] Example 3

[0048] like Figure 1 and Figure 2As shown, a bearing vibration isolator with adjustable vibration isolation rate includes a base ring 1. The outer surface of the base ring 1 is provided with a plurality of blades 3. The blades 3 are spirally distributed around the base ring 1. Triangular filling rubber 4 is provided at the connection between the base ring 1 and the blades 3. One corner of the triangular filling rubber 4 abuts against the connection between the blade 3 and the base ring 1. One of the two faces on this corner is connected to the outer surface of the base ring 1, and the other is connected to the inner wall of the blade 3. A variable diameter compression ring 6 is provided around the base ring 1, and the blades 3 abut against the inner wall of the compression ring 6.

[0049] The stiffness variation range of the bearing isolator is determined by the hardness and filling amount of the triangular filler rubber 4, the material and number of blades 3 and their angle with the outer surface of the base ring 1, and the diameter variation of the compression ring 6.

[0050] In addition, combined Figure 6 , Figure 7 , Figure 8 As shown, the inner diameter of the compression ring 6 is adjusted by the aperture mechanism 2. The aperture mechanism 2 includes a base, a base cover 14 on the base 5, a groove 15 forming a regular polygon on the base 5, a base hole 16 with the same center as the compression ring 6 in the center of the groove 15, a base cover hole 17 with the same center as the compression ring 6 on the base cover 14, and a limiting groove 18 with the same number of sides as the groove 15 on the base cover 14. One end of the limiting groove 18 is close to the base cover hole 17, and the other end is close to the edge of the base cover 14, and they are arranged diverging along the base cover hole 17. Each side of the groove 15 is provided with an aperture blade 19. The lower part of the aperture blade 19 is provided with a moving post 20 that inserts into the groove 15, and the upper part of the aperture blade 19 is provided with a limiting post 21 that inserts into the limiting groove 18. The aperture blade 19 surrounds and forms the compression ring 6. Rotating the base 5 changes the size of the inner diameter of the compression ring 6.

[0051] Combination Figure 10 As shown, in this embodiment, a worm 8 with a turbine 7 is also included. The edge of the base is provided with teeth 9, which mesh with the turbine 7 on the worm 8. The worm 8 is a self-locking worm, and the worm 8 is provided with an adjustment knob 10 to drive its rotation.

[0052] During installation, the aperture mechanism 2 is mounted on the bearing seat 11, the base ring 1 is mounted inside the compression ring 6 of the aperture mechanism 2, the blade 3 abuts against the compression ring 6, the bearing 13 is mounted inside the base ring 1, and the worm gear 8 is rotatably mounted on the housing 12.

[0053] In use, the base 5 of the driving aperture mechanism 2 rotates, such as... Figure 9 As shown, the compression ring 6 is compressed or expanded, thereby adjusting the deformation of the blade 3. When the blade 3 is deformed from the basic state to the compressed state, the stiffness of the bearing isolator increases and the vibration isolation rate decreases. The greater the compression deformation, the lower the vibration isolation rate.

[0054] In this embodiment, the base 5 can be rotated by rotating the worm gear 8. Since the worm gear 8 is equipped with an adjustment knob 10 to drive its rotation, the worm gear 8 can be rotated by rotating the adjustment knob 10.

[0055] In the above embodiments, the stiffness variation range of the bearing isolator is determined by the hardness and filling amount of the triangular filler rubber 4, the material and number of blades 3 and their angle with the outer surface of the base ring 1, and the diameter variation of the compression ring 6.

[0056] In addition, the aperture mechanism used in the above embodiments is a relatively mature mechanism that is already available on the market, and its operation method can be found at https: / / www.bilibili.com / video / BV1hE411d7fu.

[0057] This invention relates to an adjustable bearing isolator, its installation structure, and adjustment method. By isolating vibrations at the source, it greatly improves the NVH performance of products. By controlling the radial compression of the bearing isolator to achieve varying stiffness, the isolator is adjustable, which can compensate for NVH problems caused by manufacturing variations. For example, gear manufacturing often has tolerances, and gear meshing noise is often sensitive to these tolerances. Controlling these variations is both a requirement and a challenge. When the isolator is adjustable, it means that corresponding adjustments can be made to each electric drive assembly, thereby ensuring the NVH robustness of the product and bringing a better customer experience.

[0058] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0059] The aspects disclosed in this specification and claims are merely examples, and therefore, this specification and claims are not limited to the details shown. In the foregoing description, detailed descriptions of relevant known functions or configurations have been omitted where it would unnecessarily obscure the focus of this specification and claims.

[0060] Finally, it should be noted that the above description is a further detailed explanation of the invention in conjunction with specific embodiments. It should not be considered that the specific implementation of the invention is limited to these descriptions. For those skilled in the art, any simple substitutions made without departing from the concept of the invention should be considered within the scope of protection of this invention. The above embodiments are merely representative examples of the invention. Obviously, the invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the invention should be considered within the scope of protection of this invention.

Claims

1. A bearing vibration isolator with adjustable vibration isolation rate, comprising a base ring (1), characterized in that: The outer surface of the base ring (1) is provided with a number of blades (3). The blades (3) are spirally distributed around the base ring (1). Triangular filling rubber (4) is provided at the connection between the base ring (1) and the blades (3). A variable diameter compression ring (6) is provided around the base ring (1). The blades (3) abut against the inner wall of the compression ring (6). The inner diameter of the compression ring (6) is adjusted by an aperture-like mechanism (2). The aperture-like mechanism (2) includes a base, a base cover (14) is fitted on the base (5), the base (5) has a groove (15) forming a regular polygon, the center of the groove (15) has a base hole (16) concentric with the compression ring (6), the base cover (14) has a base cover hole (17) concentric with the compression ring (6), and the base cover (14) has a limiting groove (18) with the same number of sides as the groove (15). One end is close to the base cover hole (17), and the other end is close to the edge of the base cover (14). They are arranged in a radiating pattern along the base cover hole (17). Each side of the groove (15) is provided with an aperture blade (19). The lower part of the aperture blade (19) is provided with a motion post (20) inserted into the groove (15). The upper part of the aperture blade (19) is provided with a limiting post (21) inserted into the limiting groove (18). The aperture blade (19) surrounds and forms the compression ring (6). Rotating the base (5) changes the inner diameter of the compression ring (6).

2. The bearing vibration isolator with adjustable vibration isolation rate according to claim 1, characterized in that: One corner of the triangular filling rubber (4) abuts against the connection between the blade (3) and the base ring (1). One of the two faces on this corner is connected to the outer surface of the base ring (1), and the other is connected to the inner wall of the blade (3).

3. The bearing vibration isolator with adjustable vibration isolation rate according to claim 2, characterized in that: It also includes a worm (8) with a turbine (7), and the edge of the base is provided with teeth (9), which mesh with the turbine (7) on the worm (8).

4. The bearing vibration isolator with adjustable vibration isolation rate according to claim 3, characterized in that: The worm (8) is a self-locking worm, and the worm (8) is provided with an adjustment knob (10) to drive its rotation.

5. An installation structure for a bearing vibration isolator with adjustable vibration isolation rate as described in claim 1, characterized in that: The aperture mechanism (2) is mounted on the bearing seat (11), the base ring (1) is mounted inside the compression ring (6) of the aperture mechanism (2), the blade (3) abuts against the compression ring (6), and the bearing (13) is mounted inside the base ring (1).

6. The mounting structure of the bearing vibration isolator with adjustable vibration isolation rate according to claim 5, characterized in that: The bearing isolator also includes a worm (8) with a turbine (7), and the edge of the base is provided with teeth (9), which mesh with the turbine (7) on the worm (8), and the worm (8) is rotatably mounted on the housing (12).

7. A method for adjusting the vibration isolation rate of a bearing vibration isolator as described in claim 1, characterized in that: The base (5) of the aperture mechanism (2) is driven to rotate, which causes its compression ring (6) to compress or expand, thereby adjusting the deformation of the blade (3). When the blade (3) is deformed from the basic state to the compressed state, the stiffness of the bearing isolator increases and the vibration isolation rate decreases. The greater the compression deformation, the lower the vibration isolation rate.

8. The adjustment method of the bearing vibration isolator with adjustable isolation rate according to claim 7, characterized in that: The bearing isolator also includes a worm (8) with a turbine (7), and the edge of the base (5) is provided with teeth (9). The teeth (9) mesh with the turbine (7) on the worm (8), and the base (5) is rotated by rotating the worm (8).

9. The adjustment method of the bearing vibration isolator with adjustable vibration isolation rate according to claim 8, characterized in that: The worm gear (8) is provided with an adjustment knob (10) for driving its rotation. The worm gear (8) is rotated by rotating the adjustment knob (10).

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