Wire Harness Grommets

Abstract

The present disclosure provides a wire harness grommet, which comprises: a main body, comprising a first main body, a second main body connected to the first main body, and an inner wall located between the first main body and the second main body; an inner tube, which is arranged at the center of the main body and is configured to accommodate a wire harness; and a plurality of sound insulation protrusions, which are located on the main body, and each sound insulation protrusion has a conical reflective surface.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority benefit of Korean Patent Application No. 10-2019-0144598 filed on November 12, 2019, in the Korean Intellectual Property Office, which is incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a wire harness grommet. Background Art

[0004] Typically, grommets can be used to protect the wiring harness that passes through the hole in the panel. The grommets can be fitted into the hole in the panel, thereby protecting the wiring harness and preventing the ingress of foreign matter, moisture, etc.

[0005] For example, a passenger compartment of a vehicle may be separated from an engine compartment by a panel such as an instrument panel. The panel may have a hole through which a wire harness passes, and a grommet may be installed in the hole. The grommet may protect the wire harness from foreign matter, moisture, etc. entering the engine compartment. The grommet may be made of a rubber material to ensure water tightness and sound insulation relative to the hole.

[0006] Since conventional grommets have a cavity therein, noise, vibration, etc. in the engine compartment may be transmitted to the passenger compartment through the grommets, reducing the commercial value of the vehicle.

[0007] In order to prevent noise, vibration, etc. from entering the passenger compartment of the vehicle through the cavity of the grommet, there is proposed a method of filling the cavity of the grommet with sponge, filler, etc. However, this method increases manufacturing costs and reduces productivity.

[0008] The above information described in this Background section is provided to help understanding the background of the inventive concept and may include any technical concept that is not considered as prior art known to those skilled in the art. Summary of the invention

[0009] The embodiments of the present disclosure can solve the above-mentioned problems arising in the prior art while perfectly maintaining the advantages achieved by the prior art.

[0010] The present disclosure relates to a wire harness grommet. An embodiment of the present disclosure provides a wire harness grommet capable of improving water tightness and sound insulation.

[0011] According to an embodiment of the present disclosure, a wire harness grommet may include: a main body including a first main body, a second main body connected to the first main body, and an inner wall located between the first main body and the second main body; and an inner tube disposed at the center of the main body and having a passage for inserting the wire harness. The main body may have a plurality of sound insulation protrusions, and each sound insulation protrusion may have a conical reflective surface.

[0012] The body may have a fitting groove fitted to the hole of the panel, and the panel may divide the first area and the second area. The first body may face the first area, and the second body may face the second area. A plurality of soundproofing protrusions may be exposed in the second area.

[0013] A plurality of sound insulation protrusions may protrude from the second body toward the second area.

[0014] The harness grommet may further include: a first cavity in communication with the first region; and a second cavity in communication with the second region.

[0015] The harness grommet may further include: a plurality of first fingers extending in a cantilevered manner from the inner wall toward the first cavity.

[0016] The inner wall may be connected to the inner tube via a connecting web.

[0017] The harness grommet may further include: a plurality of second fingers extending in a cantilevered manner from the connection web toward the first cavity.

[0018] The harness grommet may further include a first outer tube extending from the first body, the first outer tube may be spaced apart from the inner tube in a radial direction, such that a first radial space may be defined between the first outer tube and the inner tube, and the first cavity may be in direct communication with the first radial space.

[0019] The harness grommet may further include a second outer tube extending from the second body, the second outer tube may be spaced apart from the inner tube in a radial direction so that a second radial space may be defined between the second outer tube and the inner tube, and the second cavity may be in direct communication with the second radial space.

[0020] The first body may have a tapered wall facing the first region. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description in conjunction with the accompanying drawings, in which:

[0022] Figure 1 is a cutaway perspective view showing a wire harness grommet according to an exemplary embodiment of the present disclosure;

[0023] Figure 2 is a perspective view showing a wire harness grommet according to an exemplary embodiment of the present disclosure;

[0024] Figure 3 is a cross-sectional view showing a side of a wire harness grommet according to an exemplary embodiment of the present disclosure;

[0025] Figure 4 It is shown Figure 3 A view of the structure in which the wiring harness grommet is mounted on the panel;

[0026] Figure 5 It is shown by Figure 3 An enlarged view of the portion indicated by arrow A;

[0027] Figure 6 It is shown by Figure 3 an enlarged view of the portion indicated by arrow B; and

[0028] Figure 7 is a graph showing test results of sound transmission loss (STL) of wire harness grommets according to inventive examples and comparative examples with respect to frequency.

[0029] Reference numerals:

[0030] 5: Wiring harness

[0031] 6: Panel

[0032] 7: Hole

[0033] 10: Wire harness grommet

[0034] 11: Main body

[0035] 12: Inner tube

[0036] 12a: Inner surface

[0037] 13: First reflection rib

[0038] 14: Second reflection rib

[0039] 31: First Subject

[0040] 32: Second Subject

[0041] 33: Inner wall

[0042] 34: Assembly groove

[0043] 41: Conical wall

[0044] 42: Conical surface

[0045] 43: First side

[0046] 44: Second side

[0047] 45: Corrugated wall

[0048] 61: First outer tube

[0049] 62: Second outer tube

[0050] 63: First Radial Space

[0051] 64: Second Radial Space

[0052] 70: Sound insulation protrusion

[0053] 71: Reflective surface

[0054] 72: Center groove

[0055] 81: First finger

[0056] 82: Second finger DETAILED DESCRIPTION

[0057] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals will always be used to represent the same or equivalent elements. In addition, detailed descriptions of the known technologies related to the present disclosure will be omitted to avoid unnecessarily obscuring the subject matter of the present disclosure.

[0058] In the exemplary embodiments of the present disclosure, terms such as "first", "second", "A", "B", "(a)" and "(b)" may be used to describe elements. These terms are only used to distinguish one element from another, and these terms do not limit the inherent characteristics, order or sequence of the corresponding elements. Unless otherwise defined, all terms used in this document, including technical terms or scientific terms, have the same meanings as those commonly understood by ordinary technicians in the technical field to which the present disclosure belongs. Terms such as those defined in general dictionaries should be interpreted as having the same meanings as the contextual meanings in the relevant technical field, and should not be interpreted as having idealized or overly formalized meanings unless clearly defined as having such meanings in this application.

[0059] Reference Figure 1 and Figure 2 , the wire harness grommet 10 according to an exemplary embodiment of the present disclosure may include a body 11 and an inner tube 12 provided at the center of the body 11 .

[0060] The wire harness grommet 10 may be made of a rubber material. Figure 1 and Figure 2 As shown, the body 11 may have an annular shape.

[0061] Reference Figure 4 , the wire harness 5 can pass through the hole 7 of the panel 6, the wire harness grommet 10 can be installed in the hole 7 of the panel 6, and the wire harness 5 can pass through the wire harness grommet 10. For example, the wire harness 5 can be tightly fitted into the wire harness grommet 10 so that the wire harness grommet 10 can safely protect the wire harness 5.

[0062] The harness grommet 10 may be fitted into the hole 7 of the panel 6, and the panel 6 may divide the first area 91 and the second area 92. For example, the panel 6 may be a dashboard that separates an engine room of a vehicle and a passenger room of the vehicle, the first area 91 may be the passenger room of the vehicle, and the second area 92 may be the engine room of the vehicle.

[0063] The body 11 may include a first body 31 facing the first region 91 and a second body 32 facing the second region 92 , and the first body 31 and the second body 32 may be separated by a fitting groove 34 .

[0064] The body 11 may include an inner wall 33, and the inner wall 33 may be located between the first body 31 and the second body 32. The inner wall 33 may extend vertically from the inner side of the body 11.

[0065] The first body 31 may have a tapered wall 41 facing the first region 91 and a corrugated wall 45 connected to the tapered wall 41 .

[0066] The tapered wall 41 may have a tapered surface 42 inclined at a predetermined angle, a first side surface 43 facing the first region 91, and a second side surface 44 facing the panel 6. The first side surface 43 may extend obliquely from a first end of the tapered surface 42, and the second side surface 44 may extend vertically from a second end of the tapered surface 42. The body 11 may be easily inserted into the hole 7 of the panel 6 through the tapered wall 41.

[0067] The first outer tube 61 may extend from the body 11 toward the first region 91, and may be spaced apart from the inner tube 12 in the radial direction, thereby defining a first radial space 63 between the first outer tube 61 and the inner tube 12. The first outer tube 61 may extend from the corrugated wall 45 of the first body 31 toward the first region 91.

[0068] The outer peripheral edge of the corrugated wall 45 may be integrally connected to the first side surface 43 of the tapered wall 41, and the inner peripheral edge of the corrugated wall 45 may be integrally connected to the first outer tube 61. The corrugated wall 45 may integrally connect the tapered wall 41 of the first body 31 and the first outer tube 61. Here, the inner peripheral edge of the corrugated wall 45 may be an edge toward the center of the wire harness grommet 10, and the outer peripheral edge of the corrugated wall 45 may be an edge away from the center of the wire harness grommet 10.

[0069] The second body 32 may have an outer peripheral surface 46 , a first side surface 47 facing the first region 91 , and a second side surface 48 facing the second region 92 .

[0070] The second side surface 48 may be an exposed surface directly exposed in the second region 92 , so that sound may be directly transferred from the second region 92 to the second side surface 48 .

[0071] The second outer tube 62 may extend from the body 11 toward the second region 92, and the second outer tube 62 may be spaced apart from the inner tube 12 in the radial direction, so that a second radial space 64 may be defined between the second outer tube 62 and the inner tube 12. The second outer tube 62 may be connected to the inner wall 33 of the body 11 through the expansion portion 65, and the expansion portion 65 may be formed in a tapered shape from the second outer tube 62 toward the inner wall 33 of the body 11.

[0072] The body 11 may have a fitting groove 34 fitted to the hole 7 of the panel 6, and the fitting groove 34 may be located between the first body 31 and the second body 32. The fitting groove 34 may be defined between the second side 44 of the tapered wall 41 of the first body 31 and the first side 47 of the second body 32. The fitting groove 34 may have a bottom surface 35 extending in the circumferential direction of the body 11. The lip 36 may protrude from the bottom surface 35 of the fitting groove 34 in the outer diameter direction, and the lip 36 may extend in the circumferential direction of the body 11. Since the lip 36 is elastically deformed between the hole 7 of the panel 6 and the fitting groove 34, the lip 36 may tightly seal the hole 7 and the fitting groove 34.

[0073] The inner tube 12 may be integrally connected to the body 11 through the connecting web 38, and the connecting web 38 may connect the inner wall 33 of the body 11 and the inner tube 12. The inner tube 12 may have a passage 15 defined by an inner surface 12a of the inner tube 12, and the wire harness 5 may be inserted into the passage 15 of the inner tube 12.

[0074] According to an exemplary embodiment, the inner diameter of the inner tube 12 may be smaller than the outer diameter of the wire harness 5, so that the wire harness 5 may be press-fitted into the passage 15 of the inner tube 12. Thus, the inner surface 12a of the inner tube 12 clamps the outer surface of the wire harness 5, so that the wire harness 5 may be tightly fitted into the passage 15 of the inner tube 12.

[0075] The inner tube 12 may have a plurality of first reflective ribs 13 facing the inner surface of the first outer tube 61 and a plurality of second reflective ribs 14 facing the inner surface of the second outer tube 62 .

[0076] The plurality of first reflection ribs 13 may extend from the outer surface of the inner tube 12 in an annular shape, and each of the first reflection ribs 13 may be tapered. When sound is reflected by the first reflection ribs 13 , the sound may be dissipated or attenuated in the first radial space 63 .

[0077] The plurality of second reflection ribs 14 may extend in an annular shape from the outer surface of the inner tube 12 , and each second reflection rib 14 may be tapered. When sound is reflected by the second reflection ribs 14 , the sound may be dissipated or attenuated in the second radial space 64 .

[0078] like Figure 3As shown, the harness grommet 10 may include a first cavity 101 in communication with the first region 91. The first cavity 101 may be defined by the inner wall 33, the connecting web 38, the inner tube 12, the tapered wall 41, and the corrugated wall 45. The first cavity 101 may be in direct communication with the first radial space 63, and the first radial space 63 may be in direct communication with the first region 91, so that the first cavity 101 may be in communication with the first region 91 through the first radial space 63. When the sound transmitted through the second body 32 and the inner wall 33 of the body 11, etc. is transmitted to the first cavity 101, the sound energy may be dissipated or attenuated in the first cavity 101 by reflection and resonance.

[0079] The harness grommet 10 may include a second cavity 102 in communication with the second region 92. The second cavity 102 may be defined by the expansion portion 65, the connecting web 38, and the inner tube 12. The second cavity 102 may be in direct communication with the second radial space 64, and the second radial space 64 may be in direct communication with the second region 92, so that the second cavity 102 may be in communication with the second region 92 through the second radial space 64. When sound transmitted from the second region 92 through the second radial space 64 is transmitted to the second cavity 102, the sound energy may be dissipated or attenuated in the second cavity 102 by reflection and resonance.

[0080] The body 11 may have a plurality of soundproofing protrusions 70 exposed in the second area 92, and each soundproofing protrusion 70 may protrude from the second side surface 48 of the second body 32 toward the second area 92. The plurality of soundproofing protrusions 70 may be equally spaced apart from each other along the circumference of the second side surface 48 of the second body 32. Figure 5 As shown, each soundproofing protrusion 70 may include a reflective surface 71 extending along the periphery of the soundproofing protrusion 70 and a central groove 72 recessed in the center of the soundproofing protrusion 70. The reflective surface 71 may be tapered at a predetermined angle, and the central groove 72 may be defined by a side surface 73 and a bottom 74, and open toward the second area 92. When sound is incident from the second area 92 to the soundproofing protrusion 70, the sound may be reflected by the reflective surface 71 and the central groove 72, so that the sound transmitted through the second body 32 of the main body 11 may be attenuated. In other words, the plurality of soundproofing protrusions 70 may be a soundproofing mechanism provided on the second body 32.

[0081] like Figure 6As shown, the body 11 may include a plurality of first fingers 81, and the sound transmitted through the second body 32 and the inner wall 33 causes the plurality of first fingers 81 to vibrate. The plurality of first fingers 81 may be disposed in the first cavity 101 in a cantilever manner. Each first finger 81 may extend from the inner wall 33 of the body 11 toward the first cavity 101 in a cantilever manner. In other words, the first finger 81 may have a fixed end fixed to the inner wall 33 of the body 11 and a free end located in the first cavity 101. The plurality of first fingers 81 may be spaced equidistantly from each other along the circumference of the inner wall 33 of the body 11. When the sound is transmitted to the first finger 81 through the second body 32 and the inner wall 33, the first finger 81 may be bent upward and / or downward by the transmitted sound, thereby causing the first finger 81 to vibrate. Therefore, the sound energy may be dissipated or attenuated by heat loss caused by the vibration of the first finger 81. For example, the gap between the first fingers 81, the size (length, diameter, etc.) of each first finger 81, etc. may be appropriately designed so that the plurality of first fingers 81 vibrate by the transmitted sound.

[0082] In addition, the body 11 may include a plurality of second fingers 82 that are vibrated by the sound transmitted through the connection web 38. The plurality of second fingers 82 may be disposed in the first cavity 101 in a cantilever manner. Each second finger 82 may extend from the connection web 38 toward the first cavity 101 in a cantilever manner. In other words, the second finger 82 may have a fixed end fixed to the connection web 38 and a free end located in the first cavity 101. The plurality of second fingers 82 may be spaced equidistantly from each other along the circumference of the connection web 38. When the sound is transmitted to the second finger 82 through the connection web 38, the second finger 82 may be bent upward and / or downward by the transmitted sound, thereby causing the second finger 82 to vibrate. Therefore, the sound energy may be dissipated or attenuated by heat loss caused by the vibration of the second finger 82. For example, the gap between the second fingers 82, the size (length, diameter, etc.) of each second finger 82, etc. may be appropriately designed so that the plurality of second fingers 82 vibrate by the transmitted sound.

[0083] When the plurality of first finger-shaped members 81 and the plurality of second finger-shaped members 82 are cantilevered in the first cavity 101, the acoustic energy can be converted into vibration energy, and the converted vibration energy can be converted into heat energy, so that the acoustic energy can be dissipated or attenuated. Therefore, the plurality of first finger-shaped members 81, the plurality of second finger-shaped members 82 and the first cavity 101 can form a sound absorbing mechanism for absorbing sound.

[0084] Figure 7is a graph showing sound simulation results of a wire harness grommet P according to an inventive example, a wire harness grommet D1 according to a comparative example 1, and a wire harness grommet D2 according to a comparative example 2. The wire harness grommet P according to the inventive example may have a structure including a sound insulating protrusion, a first finger, and a second finger. The wire harness grommet D1 according to the comparative example 1 may have a structure in which the sound insulating protrusion, the first finger, and the second finger are removed. The wire harness grommet D2 according to the comparative example 2 may have a structure in which the sound insulating protrusion, the first finger, and the second finger are removed and some of the walls are partially thickened.

[0085] like Figure 7 As shown, it can be seen that the wire harness grommet P according to the inventive example shows an improvement in sound transmission loss (STL) compared with the wire harness grommet D1 according to Comparative Example 1 and the wire harness grommet D2 according to Comparative Example 2.

[0086] Since the plurality of sound insulating protrusions 70 are provided on the second body 32 facing the second area 92, the sound moving toward the first area 91 can be dissipated or attenuated in the second body 32, so that the plurality of sound insulating protrusions 70 can increase the STL primarily (i.e., can reduce the sound transmittance primarily). Since the sound transmitted through the second body 32 causes the plurality of first fingers 81 and the plurality of second fingers 82 to vibrate in the first cavity 101, the sound moving toward the first area 91 can be absorbed in the first cavity 101, so that the plurality of first fingers 81 and the plurality of second fingers 82 can increase the STL secondarily (i.e., can reduce the sound transmittance secondarily).

[0087] Although the present disclosure is described above with reference to exemplary embodiments and the accompanying drawings, the present disclosure is not limited thereto but various modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the present disclosure as claimed in the appended claims.

Claims

1. A wire harness grommet, include: A body, comprising a first body, a second body connected to the first body, and an inner wall between the first body and the second body; an inner tube disposed at the center of the body and accommodating a wiring harness; a plurality of sound insulation protrusions located on the main body, and a plurality of first fingers extending from the inner wall in a cantilevered manner, Each sound insulation protrusion includes a reflective surface extending along the periphery of the sound insulation protrusion and a central groove recessed in the center of the sound insulation protrusion, and The reflecting surface is tapered at a predetermined angle.

2. The wire harness grommet according to claim 1, in, The main body has a fitting groove fitted into a hole of the panel; The panel is divided into a first area and a second area; The first body faces the first area, and the second body faces the second area; and The sound insulating protrusion is exposed in the second area.

3. The wire harness grommet according to claim 2, in, The soundproof protrusion protrudes from the second body toward the second area.

4. The wire harness grommet according to claim 2, further comprising: include: a first cavity, communicating with the first region; as well as The second chamber is communicated with the second region.

5. The wire harness grommet according to claim 4, in, The inner wall is connected to the inner tube via a connecting web.

6. The wire harness grommet according to claim 5, further comprising: include: A plurality of second fingers extend from the connecting web toward the first cavity in a cantilevered manner.

7. The wire harness grommet according to claim 4, further comprising: include: A first outer tube extends from the first body and is spaced apart from the inner tube in a radial direction, so that a first radial space is defined between the first outer tube and the inner tube, and the first cavity is directly communicated with the first radial space.

8. The wire harness grommet according to claim 4, further comprising: include: A second outer tube extends from the second body and is spaced apart from the inner tube in a radial direction so as to define a second radial space between the second outer tube and the inner tube, and the second cavity is directly communicated with the second radial space.

9. The wire harness grommet according to claim 2, in, The first body has a tapered wall facing the first region.

10. A wire harness grommet, include: A body, comprising a first body, a second body connected to the first body, and an inner wall between the first body and the second body; an inner tube disposed at the center of the body and having a passage; a sound insulation protrusion, located on a side surface of the second body, the side surface facing away from the inner wall; a first chamber defined in part by the inner wall and the inner tube; as well as a plurality of first finger-like members, arranged in the first cavity in a cantilever manner, each of the first finger-like members having a first end and a second end opposite to the first end, and the first end is fixed to the inner wall, and the second end is located in the first cavity, Each sound insulation protrusion includes a reflective surface extending along the periphery of the sound insulation protrusion and a central groove recessed in the center of the sound insulation protrusion, and The reflecting surface is tapered at a predetermined angle.

11. The wire harness grommet according to claim 10, in, The inner diameter of the channel is smaller than the outer diameter of the wire harness, and the wire harness is press-fitted into the channel.

12. The wire harness grommet according to claim 10, in, Each sound insulating protrusion has a conical reflecting surface.

13. The wire harness grommet according to claim 10, in, The sound insulating protrusions are equidistantly spaced from each other along a circumference of the side surface of the second body.

14. The wire harness grommet according to claim 10, further comprising: include: A connecting web connecting the inner wall and the inner tube; as well as A plurality of second fingers are arranged in the first cavity in a cantilever manner, each of the second fingers has a first end and a second end opposite to the first end, and the first end is fixed to the connecting web, and the second end is located in the first cavity.

15. The wire harness grommet according to claim 14, further comprising: include: A second cavity is defined in part by the inner tube and the connecting web.

16. The wire harness grommet according to claim 10, in, The body has a fitting groove fitted into a hole of the panel.

17. The wire harness grommet according to claim 16, in, The panel divides a first area and a second area, the first body faces the first area, and the second body faces the second area.

18. The wire harness grommet according to claim 17, in, The sound insulating protrusion is exposed in the second area.

19. The wire harness grommet according to claim 10, in, The harness grommet includes a rubber material.

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