Window glass vibration damping material

Abstract

To provide a window glass vibration damping member which enhances an effect of suppressing noise in a vehicle such as an automobile.MEANS FOR SOLVING THE PROBLEM: A window glass vibration damping member 40 is mounted on a lower side part of a window glass 20 of a vehicle such as a liftable automobile, where the window glass vibration damping member 40 has a roughly U-shaped channel 50 sandwiching the lower side part of the window glass 20 through a viscoelastic member 41, the viscoelastic member 41 has an exterior side face part 42 that is brought into contact with an exterior side face of the window glass 20, an interior side face part 43 that is brought into contact with an interior side face of the window glass 20, and a lower face part 44 that connects the exterior side face part 42 and the interior side face part 43 and is brought into contact with a bottom face 22 of the widow glass 20, and the lower face part 44 has at least one of thickness in a vehicle upper direction of 4 mm to 100 mm, and an upward projection part formed on the bottom face side of the window glass.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a window glass vibration damping member that has an improved effect of suppressing noise, particularly inside a vehicle such as an automobile. [Background technology]

[0002] In vehicles such as automobiles, one of the demands of users is high quietness. There are many sources of noise, one of which is the window glass attached to the door and its surroundings. For example, the vibration of the vehicle body while driving can cause the window glass to vibrate, and this vibration can generate noise.

[0003] The following Patent Document 1 discloses a technique for reducing noise caused by this vibration. As shown in Fig. 8, a window glass vibration-damping member 40 is attached to the bottom of the window glass 20. A rubber member, which is a viscoelastic member 41, has a groove corresponding to the thickness of the window glass 20. The window glass vibration-damping member 40 has a structure in which a U-shaped metallic channel 50 holds the bottom of the window glass 20 via the viscoelastic member 41, which is a rubber member. Note that Patent Document 1 does not disclose the thickness of the viscoelastic member 41 that holds the bottom of the window glass 20, but in Figs. 3 and 4 of Patent Document 1, the thickness of the viscoelastic member 41 on the side and lower sides of the window glass 20 is the same.

[0004] The document also states that when the above-mentioned window glass vibration damping member 40 was attached to the bottom edge of the window glass 20 of an actual vehicle, and the noise inside the vehicle was measured during steady driving at a speed of 100 km / h, it was confirmed that the sound pressure was reduced by approximately 1.0 dB compared to when the window glass vibration damping member 40 was not attached, and that the sound pressure was particularly reduced in the frequency range of 1 to 4 kHz. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-321526 A Summary of the Invention [Problem to be solved by the invention]

[0006] Meanwhile, with the spread of electric vehicles, there is a demand for further improvement in quietness, and the same is also required for the window glass attached to the door and its surroundings. Although it is possible to improve quietness by thickening the window glass to increase the rigidity of the window glass, thickening the window glass increases the weight by a number of kilograms, and on the other hand, it is not possible to meet the demand for weight reduction of the vehicle body. [Means for solving the problem]

[0007] The present invention aims to provide a window glass vibration damping member that reduces in-vehicle noise with a simple structure by improving the conventional structure in order to further reduce noise caused by window glass vibration and further improve quietness.

[0008] In order to solve the above problems, the present invention of claim 1 provides a window glass vibration-damping member attached to a lower edge portion of a window glass of a vehicle such as an automobile that can be raised and lowered, the window glass vibration-damping member comprising a substantially U-shaped channel of a rigid member that clamps the lower edge portion of the window glass via a viscoelastic member, the viscoelastic member having an exterior side portion that contacts the exterior side portion of the window glass, an interior side portion that contacts the interior side portion of the window glass, and a lower surface portion that is connected to the exterior side portion and the interior side portion and contacts a bottom surface of the window glass, The thickness of the outer side portion and the inner side portion are the same. The thickness of the underside in the vertical direction of the vehicle is 4 to 14 mm. and is thicker than the outer side portion and the inner side portion. The window glass vibration damping member is characterized by the above.

[0009] In the present invention of claim 1, the window glass vibration-damping member is configured such that a substantially U-shaped channel of a rigid member clamps a lower edge portion of the window glass via a viscoelastic member, and the viscoelastic member has an exterior side portion that contacts the exterior side portion of the window glass, an interior side portion that contacts the interior side portion of the window glass, and a lower surface portion that contacts a bottom surface of the window glass and connects to the exterior side portion and the interior side portion, The underside isThe thickness in the vertical direction of the vehicle is 4mm to 100mm, so the thicker underside can better absorb the vibration energy generated by the window glass vibrating due to vibrations of the vehicle body while traveling, thereby dampening the vibrations and reducing noise generation.

[0010] If the thickness is less than 4 mm, the vibration damping effect is small with increasing thickness of the lower surface. Also, the vibration damping effect does not improve linearly with increasing thickness, and the degree of the damping effect gradually decreases as the thickness increases, but the vibration damping effect is maintained up to about 100 mm. Furthermore, up to about 100 mm, interference with surrounding parts and an increase in the weight of the window glass vibration damping member as a whole do not pose much of a problem. The thickness of the lower surface portion 44 is preferably 4 mm to 14 mm.

[0013] The present invention of claim 2 is A window glass vibration damping member attached to a lower edge portion of a window glass of a vehicle such as an automobile that can be raised and lowered, the window glass vibration damping member has a substantially U-shaped channel of a rigid member that clamps the lower edge portion of the window glass via a viscoelastic member, the viscoelastic member has an exterior side portion that abuts against the exterior side portion of the window glass, an interior side portion that abuts against the interior side portion of the window glass, and a lower surface portion that is connected to the exterior side portion and the interior side portion and abuts against a bottom surface of the window glass, and an upward protrusion portion is formed on the lower surface portion on the bottom surface side of the window glass, The height of the upper protrusion in the vertical direction of the vehicle is 1mm to 2.5mm. Characterized by It is a window glass vibration damping member.

[0014] In the present invention of claim 2, The window glass vibration damping member has a substantially U-shaped channel of a rigid member that clamps a lower edge portion of the window glass via a viscoelastic member, the viscoelastic member having an exterior side portion that abuts against the exterior side portion of the window glass, an interior side portion that abuts against the interior side portion of the window glass, and a lower surface portion that abuts against a bottom surface of the window glass and connects the exterior side portion and the interior side portion, and an upper protrusion portion is formed on the lower surface portion on the bottom surface side of the window glass, The height of the upper protrusion in the vertical direction of the vehicle is 1 mm to 2.5 mm, so that the upper protrusion of the viscoelastic material distorts when it elastically contacts the bottom of the window glass. This distortion causes the window glass to vibrate, and the vibration energy generated can be efficiently converted into heat, dampening the vibrations and reducing noise generation.

[0015] If the height of the upper protrusion in the vertical direction of the vehicle is less than 1 mm, the degree of distortion is small, so vibration cannot be sufficiently damped and the effect of reducing noise generation is small. On the other hand, if the height of the upper protrusion in the vertical direction of the vehicle is more than 2.5 mm, when the window glass is inserted into the viscoelastic member, the reaction force toward the top of the vehicle due to the deformation of the upper protrusion becomes large, making it difficult to fix the window glass vibration damping member to the window glass.

[0016] The present invention of claim 3 is In the invention of claim 2, the upper protrusion is a window glass vibration damping member having a triangular cross-sectional shape. The present invention of claim 4 is the invention of claims 1 to 3,The window glass vibration damping member has protrusions formed on the outer and inner sides of the window glass of the channel for pressing against the outer and inner side surfaces of the viscoelastic member.

[0017] Claim 4 In the present invention, protrusions are formed on the exterior and interior sides of the window glass of the channel to press against the exterior and interior side portions of the viscoelastic member, so that the window glass vibration damping member can be securely clamped at a predetermined position below the window glass. Effect of the Invention

[0018] The window glass vibration-damping member has a substantially U-shaped channel, which is a rigid member, that clamps a lower edge portion of the window glass via a viscoelastic member, and the viscoelastic member has an exterior side portion that abuts against the exterior side portion of the window glass, an interior side portion that abuts against the interior side portion of the window glass, and a lower surface portion that abuts against a bottom surface of the window glass and is connected to the exterior side portion and the interior side portion, The underside is The thickness in the vertical direction of the vehicle is 4mm to 100mm, so the thicker underside can better absorb the vibration energy generated by the window glass vibrating due to vibrations of the vehicle body while traveling, thereby dampening the vibrations and reducing noise generation. The thickness of the lower surface portion 44 is effective in reducing vibrations when it is between 4 mm and 100 mm, and is preferably between 4 mm and 14 mm.

[0019] the window glass vibration-damping member is configured such that a substantially U-shaped channel of the rigid member clamps a lower edge portion of the window glass via a viscoelastic member, the viscoelastic member having an exterior side portion that abuts against the exterior side portion of the window glass, an interior side portion that abuts against the interior side portion of the window glass, and a lower surface portion that abuts against a bottom surface of the window glass and is connected to the exterior side portion and the interior side portion, The lower surface portion has an upper protrusion formed on the bottom side of the window glass. The height of the upper protrusion in the vertical direction of the vehicle is 1 mm to 2.5 mm. When the upper protrusion of the viscoelastic member elastically contacts the bottom of the window glass, it distorts, and this distortion causes the window glass to vibrate, generating vibration energy that can be efficiently converted into heat, damping the vibrations and reducing noise generation. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic perspective view of an automobile door glass structure used in an embodiment of the present invention. [Diagram 2] 1 is a cross-sectional view of a window glass vibration-damping member according to a first embodiment of the present invention. [Diagram 3]FIG. 1 is a diagram illustrating noise measurement. [Figure 4] 4 is a graph showing the results of noise measurement in the first embodiment. [Diagram 5] 4 is a graph showing the relationship between the thickness of the lower surface portion in the vehicle vertical direction and acceleration. [Figure 6] FIG. 4 is a cross-sectional view of a window glass vibration-damping member according to a second embodiment of the present invention. [Figure 7] 13 is a graph showing the results of noise measurement in the second embodiment. [Figure 8] 1 is a cross-sectional view of a conventional window glass vibration-damping member (Patent Document 1). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] 1 is a schematic perspective view of an automobile door glass structure used in an embodiment of the present invention, which uses a wire-type door window regulator 60 as a mechanism for raising and lowering a window glass 20. In this embodiment, a front door of a vehicle will be taken as an example. Note that the same names and symbols are used to describe the same parts as in the background art.

[0022] (Door glass structure) The door 1 is composed of an inner panel (not shown) and an outer panel 12, and is integrally formed with a door body 13 that houses the window glass 20 when it is lowered, and a window sash 14 that supports the window glass 20 when it is raised. A pair of run channels 16, 17 are provided on both sides inside the door body 13 of the automobile door 1 to guide the front and rear ends of the vehicle when the window glass 20 is raised and lowered. A center guide rail 61 is fixed between the run channels 16, 17. A carrier plate 62 is attached to the center guide rail 61 so as to be movable up and down. The window glass 20 is connected to the door window regulator 60 by screwing the connection holes 21, 21 (FIG. 3) provided in the lower side of the window glass 20 to the carrier plate 62 with connection bolts 64, 64. In the embodiment of the present invention, a glass having a thickness of 4 mm is used.

[0023] Further, the carrier plate 62 is connected to the drive motor 30 via a wire cable 63, and by pulling the wire cable 63 with the drive motor 30, the carrier plate 62 and the window glass 20 can be raised and lowered.

[0024] In FIG. 1, the position of the window glass 20 indicated by the two-dot chain line indicates a state in which the window glass 20 is completely retracted into the door body 13, that is, a state in which the window glass 20 is fully open.

[0025] (Window glass vibration damping member 40) As shown in FIG. 1, two window glass vibration damping members 40 are attached to the lower edge of the window glass 20. This is due to the constraints of the door glass structure in which the connecting holes 21, 21 are connected to the door window regulator 60 by connecting bolts 64, 64 at the center of the lower edge of the window glass 20. Two window glass vibration damping members 40, each with a length of 140 mm in the longitudinal direction of the vehicle, are used. However, the length is not limited to 140 mm. Furthermore, window glass vibration damping members 40 with different lengths in the longitudinal direction of the vehicle may be used. Furthermore, they may be attached to either the front or the rear.

[0026] In addition, since the window glass vibration damping member 40 has a greater vibration reducing effect the wider the area it covers at the bottom edge of the window glass 20, a long window glass vibration damping member may be used, or a plurality of short window glass vibration damping members, each 70 mm long, may be used. In short, the window glass vibration damping member can be installed taking into consideration its positional relationship with the door window regulator 60 and the space between it and surrounding parts.

[0027] Fig. 2 is a cross-sectional view of a window glass vibration-damping member 40 according to a first embodiment of the present invention. Note that Fig. 2 shows the respective shapes and positional relationship of the window glass 20, the viscoelastic member 41 that is the window glass vibration-damping member 40, and the substantially U-shaped channel 50, and does not show the shape of the window glass vibration-damping member 40 when attached to the window glass 20.

[0028] The window glass vibration damping member 40 is composed of a viscoelastic member 41 having an outer side portion 42 that abuts the outer side surface of the window glass 20, an inner side portion 43 that abuts the inner side surface of the window glass 20, and a bottom surface portion 44 that connects the outer side portion 42 and the inner side portion 43, and a roughly U-shaped channel 50 that covers the outer side surface of the viscoelastic member 41, and is structured so that the bottom edge of the window glass 20 is clamped by this channel 50.

[0029] The viscoelastic member 41 is made of butyl rubber, and the thicknesses of the vehicle exterior side portion 42 and the vehicle interior side portion 43 are both 1.5 mm, while the thickness of the bottom surface portion 44 is 8.0 mm. The thickness of the bottom surface portion 44 is not limited to 8.0 mm, and a thickness in the range of 4.0 mm to 100 mm is effective in terms of vibration damping effect, prevention of interference with surrounding parts, and increase in weight of the entire window glass vibration damping member.

[0030] Rubber or synthetic resin is preferably used as the viscoelastic member 41. Usable rubber materials are not particularly limited, but examples thereof include, other than butyl rubber, butadiene rubber, ethylene propylene diene rubber, isoprene rubber, chloroprene rubber, nitrile rubber, neoprene rubber, acrylic rubber, urethane rubber, silicone rubber, fluororubber, etc. Examples of synthetic resin materials include plastic elastomers such as acrylic resin, urethane resin, vinyl chloride resin, and styrene thermoplastic resin.

[0031] Convex portions 47, 48 protruding toward the window glass 20 and bulging portions 45, 46 bulging away from the window glass 20 are formed on the upper portions of the exterior side portion 42 and interior side portion 43 of the viscoelastic member 41.

[0032] On the other hand, the channel 50 is made of metal, and in the first embodiment, a hot-dip galvanized steel sheet is used as the material. As described above, the channel 50 needs to clamp, i.e., restrain, the lower edge portion of the window glass 20 together with the viscoelastic member 41, and therefore is required to have high rigidity. There are no particular limitations on the material as long as it can restrain the viscoelastic member 41, and specific examples include metal and FRP. As the metal material, steel is preferably used from the viewpoint of cost and ease of processing.

[0033] Above the channel 50, inwardly protruding protrusions 51, 52 are formed on the side of the channel 50, and above the protrusions 51, 52, at the opening of the channel 50, inclined portions 53, 54 are formed which widen in the direction away from the window glass 20.

[0034] (Installation of window glass vibration damping member 40) The window glass vibration damping member 40 is installed by attaching the viscoelastic member 41 to the lower edge portion of the window glass 20 and then inserting the window glass 20 to which the viscoelastic member 41 is attached into the channel 50.

[0035] 2, the opening of the channel 50 is formed with inclined portions 53, 54 that widen in the direction away from the window glass 20, so that the window glass 20 to which the viscoelastic member 41 is attached can be smoothly inserted into the channel 50. In addition, the channel 50 receives the viscoelastic member 41 as the protrusions 51, 52 widen in the direction away from the window glass 20.

[0036] 2, a gap S is formed below the protrusions 51, 52 of the channel 50 between the vehicle exterior side surface portion 42 and the vehicle interior side surface portion 43 of the viscoelastic member 41, so that the window glass 20 to which the viscoelastic member 41 is attached can easily move downward within the channel 50. Note that the gap S may be formed only on either the vehicle exterior side surface portion 42 side or the vehicle interior side surface portion 43 side, or no gap S may be formed.

[0037] Then, the bottom surface 22 of the window glass 20 comes into contact with the upper surface of the lower surface portion 44 of the viscoelastic member 41 so as to press it slightly downward, completing the installation. At this time, since the convex portions 47, 48 protruding toward the window glass 20 and the bulging portions 45, 46 bulging on the opposite side to the window glass 20 are formed on the upper portions of the vehicle exterior side portion 42 and the vehicle interior side portion 43 of the viscoelastic member 41, the vicinity of the upper end portion of the viscoelastic member 41 is pressed toward the window glass 20 by the protruding stripes 51, 52 of the channel 50, and further, the upper portion of the viscoelastic member 41 has the bulging portions 45, 46 pressed toward the window glass 20 by the inclined portions 53, 54 of the channel 50, and is also pressed toward the window glass 20 by the convex portions 47, 48 protruding toward the window glass 20, the window glass vibration damping member 40 can be firmly clamped against the lower edge portion of the window glass 20. In this embodiment, the weight of the window glass vibration damping member 40, that is, the total weight of the viscoelastic member 41 and the channel 50, is about 300 grams per window glass 20.

[0038] (Verification of effectiveness; noise measurement method) Fig. 3 is a diagram explaining noise measurement. A sound source 70 is placed at the position of a human ear inside the vehicle (the dotted circle in Fig. 3). Twenty acceleration pickups 71 (vibration level meters) that receive vibrations from the window glass 20 are attached to the outside of the vehicle. The acceleration pickups 71 are the sensor part of the vibration level meter, and output an electrical signal proportional to the vibration acceleration.

[0039] Since the frequency characteristics sensed by the human ear are geometric, an octave analysis was used for the analysis. Within the audible frequency range for noise, the sound pressure level for each band is measured through a bandpass filter set to a standard of 1 / 3 octave. Please refer to JIS C 1513:2002 for the characteristics of bandpass filters.

[0040] (Confirmation of effectiveness; noise measurement results) Fig. 4 shows the measurement results for the window glass 20 alone (without the window glass vibration-damping member 40) (■ + dashed dotted line), when a conventional window glass vibration-damping member 40 (with a bottom surface thickness of 2.0 mm) was installed (▲ + dashed line), and when the window glass vibration-damping member 40 of the present invention was installed (◯ + solid line). Note that in Fig. 4, the smaller the acceleration (dB) value, the more the vibration of the window glass 20 is suppressed.

[0041] As is clear from Figure 4, compared to the conventional window glass vibration damping member 40, the window glass vibration damping member 40 of the present invention has a reduced acceleration value overall in the frequency range above 1 kHz, and a particularly significant reduction is observed in the range from 4 kHz to 6 kHz (a slightly higher frequency range).

[0042] In the above-mentioned window glass vibration-damping member 40, at the lower edge of the window glass 20, the lower surface 44 of the viscoelastic member 41 of the window glass vibration-damping member 40 is located between the window glass 20 and the channel 50, which is a rigid member, so we believe that the noise reduction mechanism can be explained by a constraint-type vibration-damping structure model.

[0043] That is, when the window glass 20 vibrates due to vibration of the vehicle body while traveling, the window glass 20 undergoes bending deformation. At that time, the channel 50, which is a rigid member integrated with the window glass 20, restricts the expansion and contraction of the surface of the window glass 20 due to the bending deformation.

[0044] At that time, shear stress is generated in the window glass vibration damping member 40, but this shear stress itself can be absorbed by the viscoelastic member 41. It is believed that as the underside portion 44 of the window glass vibration damping member 40 becomes thicker, the degree of absorption of vibration energy increases, and vibrations can be further damped.

[0045] Fig. 5 is a graph showing the relationship between the thickness of the lower surface portion 44 of the window glass vibration damping member 40 in the vehicle vertical direction and acceleration (dB) at a frequency of 3.15 kHz. Since the thickness of the window glass 20 is 4 mm, a comparison was made at a frequency of 3.15 kHz, which is the coincidence frequency (resonance frequency). The horizontal axis of Fig. 5 (thickness (mm) of the lower surface portion 44) is enlarged to 20 mm. Note that when a glass run or the like is present and the constraint conditions of the window glass 20 are different, the coincidence frequency will be a different value from the coincidence frequency of the window glass 20 alone.

[0046] The thickness of the lower surface 44 of the window glass vibration damping member 40 in the vertical direction of the vehicle was changed in 2 mm increments from 2 mm, the thickness of the conventional window glass vibration damping member 40, to 14 mm, and then from 14 mm onwards, to 20 mm to 100 mm in 20 mm increments, and the relationship between the acceleration (dB) and each thickness was measured.

[0047] As is clear from Fig. 5, a significant vibration reduction effect was confirmed by increasing the thickness of the lower surface 44 of the window glass vibration-damping member 40 in the vehicle vertical direction to 4 mm, which is double the thickness of the conventional thickness (▲). It was also confirmed that when the thickness of the lower surface 44 of the window glass vibration-damping member 40 in the vehicle vertical direction is increased from 4 mm, the acceleration (dB) decreases almost linearly up to 8 mm.

[0048] When the thickness exceeds 8 mm, the degree of decrease gradually decreases. N It was confirmed that the thickness of the lower surface portion 44 tends to saturate at around 14 mm. In addition, when the thickness is increased from 20 mm to 100 mm in increments of 20 mm, the degree of decrease in acceleration (dB) becomes very small, but it was confirmed that the vibration damping effect is maintained up to about 100 mm. The tendency for the degree of decrease to decrease is believed to be due to the fact that the ability of the viscoelastic member 41 to absorb the shear stress generated in the window glass vibration damping member 40 decreases as the thickness of the lower surface portion 44 increases. Therefore, the vibration reducing effect is achieved when the thickness of the lower surface portion 44 is between 4 mm and 100 mm, and preferably between 4 mm and 14 mm.

[0049] Next, a second embodiment of the present invention will be described. Fig. 6 is a cross-sectional view of a window glass vibration-damping member 40 according to the second embodiment of the present invention. Note that, like Fig. 2 above, Fig. 6 shows the respective shapes and positional relationship of the window glass 20, the viscoelastic member 41 that is the window glass vibration-damping member 40, and the substantially U-shaped channel 50, but does not show the shape of the window glass vibration-damping member 40 when attached to the window glass 20.

[0050] The second embodiment differs from the first embodiment in that the thickness of the lower surface portion 44 is 2.0 mm, similar to the conventional one, and an upper protrusion 49 is formed on the lower surface portion 44 on the side of the bottom surface 22 of the window glass 20. The shape of the upper protrusion 49 is an isosceles triangle in cross section, and the height of the upper protrusion 49 is 1.5 mm. Note that the shape of the upper protrusion 49 is not limited to an isosceles triangle, and may be an equilateral triangle, a semicircle, or another shape such as a trapezoid.

[0051] As in the first embodiment described above, the window glass vibration damping member 40 is mounted by attaching a viscoelastic member 41 to the lower edge portion of the window glass 20 and then inserting the window glass 20 with the viscoelastic member 41 attached into the channel 50. However, in this embodiment 2, the installation is completed when the bottom surface 22 of the window glass 20 abuts and crushes the upper protrusion 49 formed above the lower surface portion 44 of the viscoelastic member 41.

[0052] (Confirmation of effectiveness; noise measurement results) Fig. 7 shows the measurement results when the conventional window glass vibration damping member 40 is attached (▲ + dashed line) and when the window glass vibration damping member 40 of the second embodiment is attached (◯ + solid line). Note that Fig. 7 also shows that the smaller the acceleration (dB) value, the more the vibration of the window glass 20 is suppressed.

[0053] As is clear from FIG. 7, the effect of the second embodiment appears differently from that of the first embodiment, with a reduction being observed in the region below 2.5 kHz, and a particularly large reduction at 2 kHz.

[0054] This is because, in this second embodiment, installation is completed when the bottom surface 22 of the window glass 20 abuts and crushes the upper protrusion 49 formed above the lower surface 44 of the viscoelastic member 41, and distortion occurs in the upper protrusion 49 as a result of it being crushed by the bottom surface 22 of the window glass 20.

[0055] It is believed that the distortion causes the window glass 20 to vibrate, and the vibration energy generated is converted into heat, thereby attenuating vibrations of a specific frequency (band), thereby reducing the generation of noise.

[0056] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the object of the present invention.

[0057] For example, in the above first and second embodiments, the window glass vibration damping member 40 is applied to a door glass structure using a wire-type door window regulator 60 as a lifting and lowering mechanism for the window glass 20, but it is also possible to apply it to a door glass structure using another type, for example, an X-type door window regulator.

[0058] For example, the first embodiment and the second embodiment may be combined, in which case it is believed that the effects of both the first embodiment and the second embodiment will be achieved.

[0059] For example, the upper protrusion 49 of the second embodiment may be formed as a lower protrusion that elastically contacts the channel 50, which is a rigid member below the lower surface portion 44. When forming the lower protrusion, the upper protrusion 49 in Fig. 6 may be formed in a shape that moves it directly to the lower side of the lower surface portion 44, but since the channel 50 has a larger area than the bottom surface 22 of the window glass 20 as the area to be formed with the lower protrusion, multiple (two or more) upper protrusions 49 in Fig. 6 may be formed below the lower surface portion 44. [Explanation of symbols]

[0060] 1 Door 20 Window Glass 22 Bottom 40 Window glass vibration damping material 41 Viscoelastic materials 42 Vehicle outside side 43 Inside side of the car 44 Bottom part 45, 46 bulge 47, 48 Convex 49 Upper projection 50 Channels 51, 52 Projection part 53, 54 Slope 60 Door window regulator 70 Sound Sources 71 Acceleration Pickup

Claims

1. A window glass vibration damping member that is attached to a lower edge portion of a window glass of a vehicle such as an automobile that can be raised and lowered, The window glass vibration damping member has a substantially U-shaped channel of a rigid member that clamps the lower edge portion of the window glass via a viscoelastic member, The viscoelastic member has an exterior side surface portion that abuts against an exterior side surface of the window glass, an interior side portion that abuts against an interior side surface of the window glass; a lower surface portion connected to the vehicle exterior side surface portion and the vehicle interior side surface portion and in contact with a bottom surface of the window glass; the thickness of the vehicle exterior side portion and the vehicle interior side portion is the same, A window glass vibration damping member, wherein the lower surface portion has a thickness in the vehicle vertical direction of 4 mm to 14 mm and is thicker than the vehicle exterior side surface portion and the vehicle interior side surface portion.

2. A window glass vibration damping member to be attached to a lower edge portion of a window glass of a vehicle such as an automobile that can be raised and lowered, The window glass vibration damping member has a substantially U-shaped channel of a rigid member that clamps the lower edge portion of the window glass via a viscoelastic member, The viscoelastic member has an exterior side surface portion that abuts against an exterior side surface of the window glass, an interior side portion that abuts against an interior side surface of the window glass; a lower surface portion connected to the vehicle exterior side surface portion and the vehicle interior side surface portion and in contact with a bottom surface of the window glass; The lower surface portion is formed with an upper protrusion portion on the bottom surface side of the window glass, A window glass vibration damping member, wherein the height of the upper protrusion in the vehicle vertical direction is 1 mm to 2.5 mm.

3. A window glass vibration damping member as described in claim 2, wherein the upper protrusion has a cross-sectional shape that is triangular.

4. A window glass vibration damping member as described in any one of claims 1 to 3, wherein a protrusion portion is formed on the outer side and the inner side of the window glass of the channel, which presses against the outer side and the inner side of the viscoelastic member.

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