Frequency-damped mounting system

Abstract

This application relates to a frequency damping mounting system. A vibration damper for securing a first structure to a second structure includes: a primary isolator of elastomeric material, configured to engage the first structure for securing to the first structure, and including a tubular body and a shoulder adjacent to an axial end of the tubular body, the shoulder extending radially inward to partially close the axial end of the tubular body. The vibration damper further includes a fastener having a rod portion extending through the tubular body of the primary isolator and configured for securing to the second structure; a rigid tube disposed around the rod portion of the fastener and extending through the tubular body of the primary isolator; and a helical spring disposed around the rigid tube and engaging the shoulder of the primary isolator within the tubular body.

Description

[0001] Cross-references to related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application Serial No. 63 / 226,927, filed on July 29, 2021, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates to a frequency damping mounting system for vehicle systems and components. Background Technology

[0004] Vehicle systems, components, and parts generate noise and vibration during vehicle operation. Efforts to mitigate noise and vibration include frequency damping and avoiding resonant frequencies. The industry uses many different types of damping components and technologies, the selection of which depends on the specific application. There is an ongoing pursuit of improved damping in the industry because noise and vibration not only lead to more rapid and severe degradation of components but are also associated with negative consumer perceptions of vehicle quality. Summary of the Invention

[0005] According to one aspect of this disclosure, a vibration isolating damper is provided for securing a first structure to a second structure. The vibration isolating damper includes a primary isolator of elastomeric material configured to engage the first structure for securing to it, and includes a tubular body and a shoulder adjacent to an axial end of the tubular body, the shoulder extending radially inward to partially close the axial end of the tubular body. The vibration isolating damper also includes a fastener having a rod portion extending through the tubular body of the primary isolator and configured for securing to the second structure; a rigid tube disposed around the rod portion of the fastener and extending through the tubular body of the primary isolator; and a helical spring disposed around the rigid tube and engaging the shoulder of the primary isolator within the tubular body.

[0006] According to another aspect of this disclosure, a mounting bracket assembly for attaching a component to a structural element in a vehicle is provided. The mounting bracket assembly includes at least one vibration damper configured to attach the component to the structural element while limiting the transmission of vibrations therebetween. The vibration damper includes a primary isolator of elastomeric material configured to engage a first structure for fixation to the first structure, and includes a tubular body and a shoulder adjacent to an axial end of the tubular body, the shoulder extending radially inward to partially close the axial end of the tubular body. The vibration damper also includes a fastener having a rod portion extending through the tubular body of the primary isolator and configured for fixation to a second structure; a rigid tube disposed around the rod portion of the fastener and extending through the tubular body of the primary isolator; and a helical spring disposed around the rigid tube and engaging the shoulder of the primary isolator within the tubular body. Attached Figure Description

[0007] The subject matter considered to be the invention is specifically pointed out and clearly stated in the claims at the end of this specification. The foregoing and other features and advantages of the invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0008] Figure 1A A perspective view of a mounting bracket assembly according to one aspect of this disclosure is shown;

[0009] Figure 1B It shows Figure 1A End view of the mounting bracket assembly;

[0010] Figure 1C It shows Figure 1A Side view of the mounting bracket assembly;

[0011] Figure 2 An exploded view is shown, which illustrates... Figure 1A The components of the vibration damper in the mounting bracket assembly;

[0012] Figure 3 An exploded view is shown, illustrating the components of a vibration isolation damper according to one aspect of this disclosure;

[0013] Figure 4 It shows Figure 1A A partial cross-sectional view showing the internal details of the vibration damper in the mounting bracket assembly; and

[0014] Figure 5 A graph is shown, in which the curves illustrate the dynamic transmitted stiffness of the vibration damper with and without a coated helical spring, and with a PVC coated helical spring, as the frequency changes. Detailed Implementation

[0015] The invention will now be described with reference to the accompanying drawings, in which specific embodiments will be shown, but not limited thereto. Various embodiments of the invention are shown and disclosed herein.

[0016] Figures 1A-1C Several views of the mounting bracket assembly 20 of this disclosure are shown. The mounting bracket assembly 20 can be used to attach components (such as compressors) to larger structures (such as the chassis of a vehicle) and limit the transmission of vibrations therebetween. The mounting bracket assembly 20 of this disclosure can reduce noise, vibration, and harshness (NVH) that could otherwise arise as vibrations from the compressor are transmitted to other parts of the vehicle.

[0017] like Figure 1A As shown, the mounting bracket assembly 20 includes a first structure 22 connected to the second structure 24. Each of the first structure 22 and the second structure 24 is shown as a bracket. However, either or both of structures 22 and 24 can be structural members of another type of structural element (such as the housing of a motor or compressor) and / or a structural member of a larger component (such as a motor vehicle). A set of vibration dampers 50 connects the first structure 22 to the second structure 24. The mounting bracket assembly 20 includes two vibration dampers 50. However, alternative mounting brackets may include any number of vibration dampers 50. For example, a mounting bracket may include only one vibration damper. The number and configuration of the vibration dampers 50 may depend on several design considerations, such as the weight and location of the object to be mounted thereon.

[0018] The first structure 22 (also referred to as the lower support) can be formed of a rigid material such as aluminum or steel, and it can be molded, cast, and / or machined. In one embodiment, the first structure 22 can be formed in a high-pressure die casting (HPDC) process. However, other materials, such as fiber-reinforced polymer (FRP), can also be used. The first structure 22 includes a body portion 26 from which two mounting lugs 28 extend. The mounting lugs 28 are generally tubular in shape and spaced apart and substantially parallel to each other. Each mounting lug 28 defines a mounting flange 30 opposite to the body portion 26, in which a mounting hole 32 is defined and coaxial with the tubular shape. The mounting hole 32 may have internal threads for receiving bolts or other fasteners (not shown) for mounting an object (not shown). The first structure 22 also defines two damper cups 34, each damper cup 34 being configured to hold a corresponding vibration damper 50. The damper cups 34 are generally tubular in shape, spaced apart from each other, and substantially parallel to each other. Each damper cup 34 extends substantially perpendicular to the mounting lug 28.

[0019] The first structure 22 also includes an extension 36 extending from the end of the body portion 26, to which a stud 38 is attached and extends substantially parallel to and spaced apart from the damper cup 34. The stud 38 can be used to attach other devices, such as wiring harnesses and / or air ducts.

[0020] The second structure 24 (also known as the upper support) has a Z-shaped cross-section, such as Figure 1B The second structure 24 is best illustrated in the diagram. It may be formed of a rigid material (such as plastic), which may include fiber-reinforced polymer (FRP). However, the second structure 24 may be made of a metal (such as aluminum). The second structure 24 defines a lower flange portion 40 configured to be attached to the vibration damper 50. The lower flange portion 40 includes a reinforcing section adjacent to the vibration damper 50 to withstand forces applied thereto from the vibration damper 50. The second structure 24 also includes a vertical portion 42 attached to the lower flange portion 40 and extending substantially perpendicular to and away from the first structure 22. The second structure 24 also includes an upper flange portion 44 attached to the vertical portion 42 and opposite the lower flange portion 40. The lower flange portion 40, the vertical portion 42, and the upper flange portion 44 together define a Z-shaped cross-section of the second structure 24. Alternative arrangements of the second structure 24 may be provided, such as arrangements having a C-shaped or L-shaped cross-section.

[0021] The upper flange portion 44 defines a pair of mounting holes 46 that extend through the upper flange portion in a spaced-apart and substantially parallel configuration. The mounting holes 46 may include rigid inserts (such as metal sleeves) to receive corresponding bolts or screws (not shown) for securing the upper flange portion 44 to a structural element (such as the chassis of a vehicle). The upper flange portion 44 of the second structure 24 also includes an arch 48 that defines a hole 49 extending therethrough. The hole 48 can serve as a lifting lug for receiving hooks to lift the mounting bracket assembly 20 and any equipment attached thereto. The hole can be used in vehicle assembly processes to position the mounting bracket assembly 20 and corresponding equipment within the vehicle assembly prior to fastening (such as before bolts are secured through the mounting holes 46).

[0022] The lower flange portion 40 of the second structure 24 may also include similar rigid inserts (such as metal sleeves), each rigid insert being configured to receive a fastener 52 (such as a bolt or screw) of the corresponding vibration damper 50. Nuts 54 are screwed onto each fastener 52 of the vibration damper 50 for securing it to the lower flange portion 40 of the second structure 24. The fasteners 52 may be made of steel and may be, for example, class 8.8 bolts. The fasteners 52 may include M8 threads. However, the fasteners 52 may have different materials, classifications, and / or sizes.

[0023] Each vibration damper 50 includes a fastener 52 that extends through the assembly of another component to hold them together and secure the first structure 22, which is connected to the second structure 24 of the mounting bracket assembly 20. Each vibration damper 50 also includes an upper retaining washer 56, a primary isolator 58, an isolator ring 60, and a lower retaining washer 62. The upper retaining washer 56 and the lower retaining washer 62 may have the same structure and are therefore interchangeable. However, an alternative design may use different components for the upper retaining washer 56 and the lower retaining washer 62. The primary isolator 58 may be made of an elastomeric material such as rubber. The isolator ring 60 may be made of an elastomeric material such as rubber. However, these materials are merely illustrative and not intended to be limiting.

[0024] Figures 2-3 Various details of the vibration damper 50 and its attachment to the first structure 22 are shown. Figure 2 The first structure 22 is shown, wherein each damper cup 34 defines a tubular wall 100 with an upper edge 102 to receive and engage a corresponding vibration isolation damper 50.

[0025] The primary isolator 58 includes a tubular body 70 that receives and surrounds a helical spring 64 and a rigid tube 66. The tubular body 70 may have a tapered or truncated tapered shape, which facilitates mounting the primary isolator 58 (tubular body 70) within the tubular wall 100 of the first structure 22. The rigid tube 66 is configured to receive a fastener 52 passing through it, around which the helical spring 64 is wound. The rigid tube 66 may be made of steel or other rigid and durable materials. The primary isolator 58 includes a shoulder 72 adjacent to the upper axial end of the primary isolator and having an annular shape that extends radially inward to partially close the upper axial end of the primary isolator, near the upper retaining washer 56.

[0026] In some embodiments, the helical spring 64 is coated with a resilient material configured to produce specific damping characteristics over a given frequency range. For example, the composition and / or properties (such as thickness) of the resilient material may be configured such that the vibration damper has a dynamic transmission stiffness below a given value for a given frequency range. In some embodiments, the resilient material comprises polyvinyl chloride (PVC). However, other materials may also be used to coat the helical spring.

[0027] Still refer to Figure 3The primary isolator 58 also includes a tubular extension 76 extending axially upward from the shoulder 72 away from the tubular body 70. The primary isolator 58 also includes an annular extension 78 that extends radially outward from the tubular extension 76 at an end of the tubular extension 76 spaced apart from the shoulder 72. Figure 3 The annular extension 78, best shown, has a solid annular shape. However, the annular extension 78 can have different constructions, such as an annular arrangement of several different segments. The shoulder 72, the tubular extension 76, and the annular extension 78 together define an annular bag that receives the corresponding upper edge 102 of the first structure 22. A damper extension 80 with a trapezoidal cross-section extends upward from the annular extension 78 for engaging the upper retaining washer 56 and for damping any vibrations therebetween. A plurality of upper recesses 82 are defined in the damper extension 80 at regular angular intervals to provide a castellated structure (toothed structure, grooved structure). The damper extension 80 can serve as an end-of-travel feature for engaging the upper retaining washer 56, thereby limiting the travel in the compression direction between the first structure 22 and the second structure 24 when the first structure 22 and the second structure 24 come together, i.e., when the vibration damper 50 is in the fully extended position.

[0028] The primary isolator 58 also includes a lower skirt 84 that extends circumferentially around the lower end of the tubular body 70 opposite the shoulder 72 and radially outward from that lower end. A plurality of protrusions 86 extend from the lower surface of the lower skirt 84 away from the shoulder 72. The protrusions 86 can serve as stroke-end features for engagement with the lower retaining washer 62, thereby limiting the stroke between the first structure 22 and the second structure 24 in the tension direction when the first structure 22 and the second structure 24 are pulled apart, i.e., when the vibration damper 50 is in the fully compressed position.

[0029] Figure 3 It is also shown that each of the upper retaining washer 56 and the lower retaining washer 62 includes a flat plate 88 having a circular shape and a central hole through which the fastener 52 passes. Each of the upper retaining washer 56 and the lower retaining washer 62 also includes a positioning feature 89 adjacent to the central hole, and the positioning feature extends substantially perpendicular to the flat plate 88 to engage the rigid tube 66 therebetween. In some embodiments, the positioning feature 89 of each of the upper retaining washer 56 and the lower retaining washer 62 may include a tubular protrusion that can be press-fitted into the central bore of the rigid tube 66. However, the positioning feature 89 of either or both of the upper retaining washer 56 and / or the lower retaining washer 62 may have different configurations.

[0030] Figure 3 Also shown is an isolator ring 60, which includes a flange portion 90 disposed adjacent to a lower retaining washer 62. The isolator ring 60 also includes a narrow portion 92 projecting upward from the flange portion 90 and having a shared central bore configured to tightly surround the rigid tube 66 adjacent to the lower retaining washer 62. The isolator ring 60 can engage a helical spring 64, wherein the flange portion 90 extends between the helical spring 64 and the flat plate 88 of the lower retaining washer 62. The narrow portion 92 is configured to fit within the helical spring, wherein one end of the helical spring 64 is disposed around the narrow portion 92 to position the helical spring 64 coaxially and spaced apart from the rigid tube 66.

[0031] Figure 4 This is a partial cross-sectional view showing the internal details of the vibration isolation damper 50 and its attachment to the first structure 22 and the second structure 24. Figure 4 A bolt-type fastener 52 is shown, its head contacting the lower surface of the lower retaining washer 62 opposite the positioning feature 89. The fastener 52 also includes a rod portion 53 extending through the center of the lower retaining washer 62, the rigid tube 66, the upper retaining washer 56, and the lower flange portion 40 of the second structure 24 for attachment thereto. Figure 4 As shown, the primary isolator 58 also includes an internal tubular portion 77 that extends axially from the shoulder 72 away from the annular extension 78 and is radially positioned between the helical spring 64 and the rigid tube 66. The internal tubular portion 77, together with the shoulder 72 and the tubular body 70, defines a bag for receiving the upper end of the helical spring 64 opposite the isolator ring. This bag in the primary isolator 58 serves to position the helical spring 64 coaxially with and spaced apart from the rigid tube 66.

[0032] Figure 5 A graph with curves 120 and 122 is shown, illustrating the frequency-dependent dynamic transmitted stiffness of the vibration isolation damper 50 of this disclosure. Curve 120 shows the dynamic transmitted stiffness of the vibration isolation damper 50 with an uncoated helical spring 64. Curve 122 shows the dynamic transmitted stiffness of the vibration isolation damper 50 with a helical spring 64 coated with PVC. As shown, curve 120 exhibits a large peak in dynamic stiffness at approximately 700 Hz and a smaller peak at approximately 1300 Hz. Curve 122 shows the dynamic transmitted stiffness with the helical spring 64 coated with PVC, and this second curve does not include any large peaks in dynamic stiffness. However, the vibration isolation damper 50 with a PVC-coated helical spring 64 generally exhibits a higher transmitted stiffness, particularly at frequencies above approximately 800 Hz.

[0033] According to one aspect of this disclosure, a vibration damper is provided for securing a first structure to a second structure. The vibration damper includes: a primary isolator of elastomeric material configured to engage the first structure for securing to the first structure, and including a tubular body and a shoulder adjacent to an axial end of the tubular body, the shoulder extending radially inward to partially close the axial end of the tubular body; a fastener having a rod portion extending through the tubular body of the primary isolator and configured for securing to the second structure; a rigid tube disposed around the rod portion of the fastener and extending through the tubular body of the primary isolator; and a helical spring disposed around the rigid tube and engaging the shoulder of the primary isolator within the tubular body.

[0034] In some embodiments, the helical spring is coated with an elastic material configured to produce specific damping characteristics within a given frequency range.

[0035] In some embodiments, the elastic material includes polyvinyl chloride (PVC).

[0036] In some embodiments, the vibration damper further includes at least one retaining washer having a plate defining a hole through which a fastener passes, and the at least one retaining washer further includes a positioning feature adjacent to the hole and configured to engage the rigid tube.

[0037] In some embodiments, the at least one retaining washer includes two retaining washers, each of which is configured to engage opposite ends of the rigid tube.

[0038] In some embodiments, the positioning feature includes a tubular protrusion configured to press-fit into a central bore of a rigid tube for securing to the central bore.

[0039] In some embodiments, the vibration damper further includes an isolator ring of elastomeric material configured to engage the helical spring, wherein the helical spring extends between the isolator ring and the shoulder of the primary isolator.

[0040] In some embodiments, the isolator ring defines a narrow portion configured to be fitted within a helical spring, wherein one end of the helical spring is disposed around the narrow portion to position the helical spring coaxial with and spaced apart from the rigid tube.

[0041] In some embodiments, the primary isolator further includes a buffer extension located away from the tubular body outside the shoulder and configured to limit the travel between the first and second structures in the compression direction.

[0042] In some embodiments, the primary isolator further includes a tubular extension and an annular extension, the tubular extension extending away from the tubular body beyond the shoulder, the annular extension extending radially outward from an end of the tubular extension spaced apart from the shoulder, and the shoulder, the tubular extension, and the annular extension together defining an annular bag that receives a corresponding edge of the first structure for securing to that edge.

[0043] In some embodiments, the primary isolator further includes a lower skirt that extends circumferentially around a lower end of the tubular body opposite to the shoulder and extends radially outward from the lower end.

[0044] In some embodiments, the primary isolator further includes a plurality of protrusions extending from the lower surface of the lower skirt away from the shoulder and configured to limit the travel between the first and second structures in the tension direction.

[0045] According to one aspect of this disclosure, a mounting bracket assembly for attaching a component to a structural element in a vehicle is provided. The mounting bracket assembly includes at least one vibration damper configured to attach the component to the structural element while limiting the transmission of vibrations therebetween. The at least one vibration damper includes: a primary isolator of elastomeric material configured to engage a first structure for attachment to the first structure, and including a tubular body and a shoulder adjacent to an axial end of the tubular body, the shoulder extending radially inward to partially close the axial end of the tubular body; a fastener having a rod portion extending through the tubular body of the primary isolator and configured for attachment to a second structure; a rigid tube disposed around the rod portion of the fastener and extending through the tubular body of the primary isolator; and a helical spring disposed around the rigid tube and engaging the shoulder of the primary isolator within the tubular body.

[0046] In some embodiments, the at least one vibration isolation damper includes two vibration isolation dampers.

[0047] In some embodiments, the helical spring is coated with an elastic material configured to produce specific damping characteristics within a given frequency range.

[0048] In some embodiments, the elastic material includes polyvinyl chloride (PVC).

[0049] In some embodiments, the mounting bracket further includes an isolator ring of elastomeric material configured to engage a helical spring, wherein the helical spring extends between the isolator ring and a shoulder of the primary isolator.

[0050] In some embodiments, the isolator ring defines a narrow portion, which is configured to be fitted within a helical spring, wherein one end of the helical spring is disposed around the narrow portion to position the helical spring coaxially with and spaced apart from the rigid tube.

[0051] In some embodiments, the primary isolator further includes a buffer extension located away from the tubular body outside the shoulder and configured to limit the travel between the first and second structures in the compression direction.

[0052] In some embodiments, the primary isolator further includes a tubular extension extending away from the tubular body beyond the shoulder, and an annular extension extending radially outward from an end of the tubular extension spaced apart from the shoulder, wherein the shoulder, the tubular extension, and the annular extension together define an annular pouch that receives a corresponding edge of the first structure for fastening to the corresponding edge.

[0053] Although the invention has been described in detail with reference to only a limited number of embodiments, it should be readily understood that the invention is not limited to these disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions, or equivalent arrangements not described above but conforming to the spirit and scope of the invention. Furthermore, while various embodiments of the invention have been described, it should be understood that aspects of the invention may include only some of the embodiments described. Therefore, the invention is not to be considered limited by the foregoing description.

Claims

1. A vibration isolation damper for fixing a first structure to a second structure, comprising: A primary isolator made of elastomeric material, configured to engage with the first structure for fixation to the first structure, includes a tubular body and a shoulder adjacent to an axial end of the tubular body, the shoulder extending radially inward to partially close the axial end of the tubular body; wherein the primary isolator further includes a lower skirt extending circumferentially around a lower end of the tubular body opposite the shoulder and extending radially outward from the lower end; the primary isolator also includes a plurality of protrusions extending from a lower surface of the lower skirt away from the shoulder and configured to limit travel between the first structure and the second structure in the tension direction; Fasteners having a rod portion extending through the tubular body of the primary isolator and configured for securing to the second structure; A rigid tube, disposed around the rod portion of the fastener and extending through the tubular body of the primary isolator; and A helical spring is disposed around the rigid tube and engages the shoulder of the primary isolator within the tubular body.

2. The vibration damper according to claim 1, wherein, The helical spring is coated with an elastic material that is configured to produce specific damping characteristics within a given frequency range.

3. The vibration damper according to claim 2, wherein, The elastic material includes polyvinyl chloride (PVC).

4. The vibration damper of claim 1 further includes at least one retaining washer having a flat plate defining a hole through which the fastener passes, and the at least one retaining washer further includes a positioning feature adjacent to the hole and configured to engage the rigid tube.

5. The vibration damper according to claim 4, wherein, The at least one retaining washer includes two retaining washers, each of which is configured to engage the opposite ends of the rigid tube.

6. The vibration damper according to claim 4, wherein, The positioning feature includes a tubular protrusion configured to press-fit into the central bore of the rigid tube for fixation to the central bore.

7. The vibration damper of claim 1 further comprises an isolator ring of elastomeric material, the isolator ring being configured to engage the helical spring, wherein the helical spring extends between the isolator ring and the shoulder of the primary isolator.

8. The vibration damper according to claim 7, wherein, The isolator ring defines a narrow portion, which is configured to be fitted within the helical spring, wherein one end of the helical spring is disposed around the narrow portion to position the helical spring coaxially with and spaced apart from the rigid tube.

9. The vibration damper according to claim 1, wherein, The primary isolator also includes a buffer extension located away from the tubular body outside the shoulder and configured to limit the travel between the first and second structures in the compression direction.

10. The vibration damper according to claim 1, wherein, The primary isolator further includes a tubular extension and an annular extension, the tubular extension extending beyond the shoulder away from the tubular body, and the annular extension extending radially outward from the end of the tubular extension spaced apart from the shoulder. The shoulder portion, the tubular extension, and the annular extension together define an annular bag, which receives a corresponding edge of the first structure to be secured to that edge.

11. A mounting bracket assembly for attaching a component to a structural element in a vehicle, comprising: At least one vibration damper for fixing the first structure to the second structure is configured to connect the component to the structural element while limiting the transmission of vibration therebetween, the at least one vibration damper comprising: A primary isolator made of elastomeric material, configured to engage the first structure for fixation to the first structure, and comprising a tubular body and a shoulder adjacent to an axial end of the tubular body, the shoulder extending radially inward to partially close the axial end of the tubular body; wherein the primary isolator further comprises a lower skirt extending circumferentially around a lower end of the tubular body opposite the shoulder and extending radially outward from the lower end; the primary isolator further comprises a plurality of protrusions extending from a lower surface of the lower skirt away from the shoulder and configured to limit travel between the first structure and the second structure in the tension direction; Fasteners having a rod portion extending through the tubular body of the primary isolator and configured for securing to a second structure; A rigid tube, disposed around the rod portion of the fastener and extending through the tubular body of the primary isolator; and A helical spring is disposed around the rigid tube and engages the shoulder of the primary isolator within the tubular body.

12. The mounting bracket assembly according to claim 11, wherein, The at least one vibration isolation damper includes two vibration isolation dampers.

13. The mounting bracket assembly according to claim 11, wherein, The helical spring is coated with an elastic material that is configured to produce specific damping characteristics within a given frequency range.

14. The mounting bracket assembly according to claim 13, wherein, The elastic material includes polyvinyl chloride (PVC).

15. The mounting bracket assembly of claim 11, further comprising an isolator ring of elastomeric material, the isolator ring being configured to engage the helical spring, wherein the helical spring extends between the isolator ring and the shoulder of the primary isolator.

16. The mounting bracket assembly according to claim 11, wherein, The isolator ring defines a narrow portion, which is configured to be fitted within the helical spring, wherein one end of the helical spring is disposed around the narrow portion to position the helical spring coaxial with and spaced apart from the rigid tube.

17. The mounting bracket assembly according to claim 11, wherein, The primary isolator also includes a buffer extension located away from the tubular body outside the shoulder and configured to limit the travel between the first and second structures in the compression direction.

18. The mounting bracket assembly according to claim 11, wherein, The primary isolator further includes a tubular extension and an annular extension, the tubular extension extending away from the tubular body beyond the shoulder, and the annular extension extending radially outward from the end of the tubular extension spaced apart from the shoulder. The shoulder portion, the tubular extension, and the annular extension together define an annular bag, which receives a corresponding edge of the first structure for securing to that edge.

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