Glass Run

Abstract

To provide a glass run which enables reduction of noise in a vehicle with a simple structure.MEANS FOR SOLVING THE PROBLEM: In a glass run 10, a bottom wall 20, a vehicle outer side wall 30, and a vehicle inner side wall 40 form a basic skeleton and the basic skeleton is attached to a door frame groove part 5 formed at a door frame 3 and guides upward or downward movement of door glass 4. The glass run 10 includes at least one of a vehicle outer seal lip 31 which extends from the vehicle outer side wall 30 to the bottom wall 20 side and slidably contacts with the vehicle outer side of the door glass 4 and a vehicle inner seal lip 41 which extends from the vehicle inner side wall 40 to the bottom wall 20 side and slidably contacts with the vehicle inner side of the door glass 4. The vehicle outer seal lip 31 or a door glass side tip 42, which slidably contacts with the door glass 4, of the vehicle inner seal lip 40 contacts with a position of the door glass 4 spaced apart from a tip by a distance which is larger than or equal to one-half of a thickness of the door glass 4 and smaller than or equal to 8 mm.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a glass run that is attached to a door frame formed in a door of a vehicle such as an automobile. [Background technology]

[0002] A vehicle door has a door frame on the top of the door body, and a channel-shaped glass run is fitted and locked into a door frame groove formed on the inner peripheral edge of the door frame. The glass seal parts inside and outside the vehicle guide the door glass as it moves up and down, and also seal the inside and outside of the vehicle.

[0003] The glass run has a basic framework (main body) consisting of a bottom wall, an exterior side wall located on the exterior side of the vehicle, and an interior side wall located on the interior side of the vehicle. The glass run generally includes an exterior seal lip and an interior seal lip extending from or near the tips of the exterior and interior side walls toward the interior of the main body. The glass run's main body is attached to a door frame groove provided along the inner periphery of the door frame, and the exterior seal lip and the interior seal lip sandwich and seal the periphery of the interior and exterior surfaces of the door glass as it moves up and down. The glass run also supports the periphery of the door glass, ensuring smooth movement of the door glass and preventing rattles in the door glass when it moves up and down.

[0004] Improving the quietness of automobiles and other vehicles increases passenger comfort, making them a highly appealing product. Furthermore, electric vehicles, which are expected to become increasingly popular in the future, no longer have engines, and the remaining noises, primarily road noise and wind noise, become more pronounced.

[0005] Wind noise is the sound generated outside the vehicle cabin when wind hits the vehicle while it is moving, and then passes through the vehicle body and reaches the interior of the vehicle. Glass runs can also reduce noise generated by the vibration of the door glass, particularly in the high frequency range of 1 kHz or higher, and studies are being conducted to increase this reduction effect. One known noise reduction technology using glass runs is the technology described in Patent Document 1 below. Patent Document 1 relates to the glass run transmission route (arrow B in Figure 8 of Patent Document 1).

[0006] 7, the glass run 100 is formed in a channel shape (C-shaped cross section) with the bottom wall 200, the exterior side wall 300, and the interior side wall 400 as basic frameworks. The interior seal lip has a first interior seal lip 470 and a second interior seal lip 480 formed closer to the bottom wall 200 than the first interior seal lip 470. The first interior seal lip 470 and the second interior seal lip 480 are both formed toward the bottom wall 200 and do not abut against each other when in sliding contact with the door glass 600. In addition, a sub-lip 500 is formed between the first interior seal lip 470 and the second interior seal lip 480, protruding obliquely toward the interior side surface of the first interior seal lip 470. When the door glass 600 is in sliding contact with the first interior seal lip 470, the sub-lip 500 abuts against the interior surface of the first interior seal lip 470. In this glass run 100, the pressing force of the first interior seal lip 470 against the interior side surface of the door glass 600 is set higher than that of the second interior seal lip 480, as shown by the magnitude relationship of the arrows in FIG. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2021-24388 Summary of the Invention [Problem to be solved by the invention]

[0008] With the widespread adoption of electric vehicles, further improvements in quietness are required, and this demand is also high for door glass and its surroundings. Measures such as increasing the thickness of door glass and installing acoustic glass have been implemented, but the increase in weight and cost are obstacles.

[0009] The present invention aims to provide a glass run that reduces interior noise with a simple structure by improving on the conventional structure, focusing on the contact position between the seal lip of the glass run and the door glass and the pressing force against the door glass at the contact position, in order to efficiently channel and dissipate the vibration energy of the door glass into the glass run, thereby increasing the vibration damping effect and further reducing noise, thereby achieving even quieter operation.The commonly used contact position between the seal lip and the door glass is approximately 10 mm from the edge of the door glass. [Means for solving the problem]

[0013] In order to solve the above problems, Claim 1 The present invention provides a glass run having a basic framework of a bottom wall, an exterior side wall, and an interior side wall, attached to a door frame, and guiding the raising and lowering of a door glass, the glass run including an interior seal lip extending from the exterior surface of the interior side wall toward the bottom wall and in sliding contact with the interior side of the door glass, the interior seal lip having at least a first interior seal lip and a second interior seal lip formed closer to the bottom wall than the first interior seal lip, the door glass-side tip of the second interior seal lip in sliding contact with the door glass abutting at a position more than half the thickness of the door glass and less than 8 mm from the tip of the door glass, and the pressing force of the second interior seal lip against the door glass is greater than that of the first interior seal lip. Further, a sub-lip is formed between the second interior seal lip and the bottom wall, protruding obliquely from the exterior surface of the interior side wall toward the interior side surface of the second interior seal lip, and when the door glass slides against the second interior seal lip, the sub-lip abuts against the interior surface of the second interior seal lip. The glass run is characterized by the above.

[0014] Claim 1In the invention, an interior seal lip is provided which extends from the exterior surface of the interior side wall towards the bottom wall and comes into sliding contact with the interior side of the door glass, the interior seal lip having at least a first interior seal lip and a second interior seal lip formed closer to the bottom wall than the first interior seal lip, the tip of the second interior seal lip on the door glass side which comes into sliding contact with the door glass abuts at a position which is at least half the thickness of the door glass and not more than 8 mm from the tip of the door glass, and the pressing force of the second interior seal lip against the door glass is greater than that of the first interior seal lip, so that the second interior seal lip strongly presses against the tip side of the door glass, thereby efficiently absorbing vibration energy generated when the door glass vibrates due to vibration of the vehicle body while driving, thereby attenuating the vibration and reducing noise generation. If the thickness is less than half the thickness of the door glass, the shape of the edge of the door glass will not ensure reliable contact with the door glass, and the vibration damping effect will not be guaranteed, which is not desirable. Also, if the thickness exceeds 8 mm, the effect will be similar to that of the conventional method, and the degree of effect will be reduced. Furthermore, a sub-lip is formed between the second interior seal lip and the bottom wall, protruding obliquely from the exterior surface of the interior side wall toward the interior surface of the second interior seal lip, and when the door glass slides against the second interior seal lip, the sub-lip abuts against the interior surface of the second interior seal lip, thereby applying even stronger pressure to the leading edge of the door glass. As a result, vibration energy generated when the door glass vibrates due to vibration of the vehicle body while the vehicle is running is efficiently absorbed, damping the vibration and reducing noise generation. [Effects of the Invention]

[0018] a glass run having a basic framework of a bottom wall, an exterior side wall, and an interior side wall, attached to a door frame, and guiding the raising and lowering of a door glass; an interior seal lip extending from the exterior surface of the interior side wall toward the bottom wall and in sliding contact with the interior side of the door glass; the interior seal lip having at least a first interior seal lip and a second interior seal lip formed closer to the bottom wall than the first interior seal lip; the tip of the second interior seal lip on the door glass side that slides against the door glass abuts at a position at least half the thickness of the door glass and not more than 8 mm from the tip of the door glass; and the pressing force of the second interior seal lip against the door glass is greater than that of the first interior seal lip, so that by firmly holding the tip side of the door glass, the vibration energy generated when the door glass vibrates due to vibration of the vehicle body while driving can be efficiently absorbed, damping the vibration and reducing noise generation. Furthermore, a sub-lip is formed between the second interior seal lip and the bottom wall, protruding obliquely from the exterior surface of the interior side wall toward the interior surface of the second interior seal lip, and when the door glass slides against the second interior seal lip, the sub-lip abuts against the interior surface of the second interior seal lip, thereby applying even stronger pressure to the leading edge of the door glass. As a result, vibration energy generated when the door glass vibrates due to vibration of the vehicle body while the vehicle is running is efficiently absorbed, damping the vibration and reducing noise generation. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a front view of an automobile door. [Figure 2] FIG. 2 is a front view showing a glass run used in the door frame of FIG. [Figure 3] 2 is a cross-sectional view of the glass run according to the first embodiment of the present invention, taken along line AA in FIG. 1. FIG. [Figure 4] 4A and 4B are diagrams for explaining noise measurement, in which FIG. 4A is a diagram seen from the cross-sectional direction of the door glass, and FIG. 4B is a diagram seen from the front of the door glass. [Figure 5] 4 is a graph showing the degree of effect of the first embodiment of the present invention. [Figure 6] 2 is a view showing a glass run according to a second embodiment of the present invention, illustrating the vehicle interior side of a cross section corresponding to line AA in FIG. 1. FIG. [Figure 7] FIG. 2 is a cross-sectional view showing a conventional glass run mounting structure, taken along line AA in FIG. 1 (Patent Document 1). DETAILED DESCRIPTION OF THE INVENTION

[0020] A first embodiment of the present invention will be described with reference to Figs. 1 to 5. Fig. 1 shows a front view of a left front door 1 of an automobile as seen from outside the vehicle. A door frame 3 is attached to the upper part of a door body 2 that constitutes this front door 1. A window opening is formed by this door frame 3 and the upper edge of the door body 2. A glass run 10 is attached to the inner peripheral edge of the window opening and inside the door body 2 to guide the raising and lowering movement of the door glass 4. The present invention is applicable not only to the left front door 1, but also to a right front door and left and right rear doors. It is also applicable to sliding doors whose door glass rises and falls.

[0021] 2 is a simplified front view of only the glass run 10 as seen from the vehicle exterior. The glass run 10 is composed of a first extrusion 11 corresponding to the horizontal frame portion of the door frame 3, a second extrusion 12 corresponding to the front vertical frame portion of the front door 1, and a third extrusion 13 corresponding to the rear vertical frame portion. The front end of the first extrusion 11 is connected to the upper end of the second extrusion 12 by a first molded portion 14. The rear end of the first extrusion 11 is connected to the upper end of the third extrusion 13 by a second molded portion 15.

[0022] 3 is a cross-sectional view of a glass run 10 according to a first embodiment of the present invention, when the glass run 10 is attached to a door frame groove 5 of a door frame 3 with a door glass 4 interposed therebetween. The glass run 10 has a channel shape (having a substantially U-shaped cross section) and is basically composed of a bottom wall 20, an exterior side wall 30, and an interior side wall 40. The connecting portions of the bottom wall 20, the exterior side wall 30, and the interior side wall 40 are connected by grooves 21, 21 on the exterior and interior sides so as to be freely expandable.

[0023] The bottom wall 20 is formed in a substantially plate-like shape, and a plurality of bottom wall recesses 22 are formed continuously in parallel in the longitudinal direction on the inner surface of the bottom wall 20 (on the door glass 4 side).

[0024] A first exterior retaining lip 33 and a second exterior retaining lip 34 that are engaged with the door frame groove 5 are formed on the exterior surface of the exterior side wall 30 near the joint with the bottom wall 20 and toward the tip of the exterior side wall 30. When the glass run 10 is installed in the vehicle, the first exterior retaining lip 33 and the second exterior retaining lip 34 abut against the inner wall of the door frame groove 5 that bulges outward.

[0025] An exterior seal lip 31 is formed at the tip of the interior side of the exterior side wall 30, extending toward the bottom wall 20 and coming into sliding contact with the exterior side of the door glass 4.

[0026] An exterior cover lip 35 is formed facing the exterior of the vehicle at the base of the exterior seal lip 31. The exterior cover lip 35 covers the exterior tip of the bent door frame groove 5 when the glass run 10 is installed in the vehicle, and fixes the exterior side wall 30 to the door frame groove 5, improving the seal with the door frame groove 5 and preventing the intrusion of rainwater, dust, and noise.

[0027] An interior seal lip 41 is formed at the tip of the exterior surface of the interior side wall 40, extending toward the bottom wall 20 and coming into sliding contact with the interior surface of the door glass 4.

[0028] A first interior retaining lip 43 and a second interior retaining lip 44 are formed on the interior surface of the interior side wall 40 near the joint with the bottom wall 20 and toward the tip of the interior side wall 40. The first interior retaining lip 43 and the second interior retaining lip 44 abut against the inner wall of the door frame groove 5 that bulges toward the interior of the vehicle when the glass run 10 is installed in the vehicle.

[0029] An interior cover lip 46 is formed facing the interior of the vehicle at the tip of the interior side wall 40. The interior cover lip 46 covers the interior tip of the bent door frame groove 5 when the glass run 10 is installed in the vehicle, fixing the interior side wall 40 to the door frame groove 5 and improving the sealing performance with the door frame groove 5 to prevent noise from entering.

[0030] In the glass run 10 of the first embodiment, the exterior seal lip 31 and the interior seal lip 41 abut against the door glass 4 such that the interior seal lip 41 is closer to the tip of the door glass 4. The interior seal lip 41 abuts against the door glass 4 at its tip 42 on the door glass side.

[0031] In this embodiment, the glass run 10 was made of an olefin-based thermoplastic elastomer (TPO) by extrusion molding.

[0032] In the embodiment of the present invention, the glass run 10 may be made of a material such as rubber, thermoplastic elastomer, or soft synthetic resin. In the case of rubber, EPDM (ethylene propylene diene rubber) is preferable, and in the case of thermoplastic elastomer, olefin-based thermoplastic elastomer (TPO) or dynamically crosslinked thermoplastic elastomer (TPV) are preferable from the viewpoints of weather resistance, recyclability, cost, etc.

[0033] Figure 4 is a diagram explaining the noise effect. Noise measurement was performed using a hammering test. In a hammering test, an object is struck with an impulse hammer (also called an impact hammer) to vibrate it, and the resulting vibrations are detected by an acceleration sensor and measured by an FFT analyzer.

[0034] 4(a) is a view of the measuring member 70, with the glass run 10 attached to the frame jig 72 and the door glass 4 inserted into the glass run 10, viewed from the cross-sectional direction of the door glass 4. The door glass 4 used was 4 mm thick, and the radius of the tip was 2 mm, which is half the thickness of the door glass 4.

[0035] As shown in Figure 4(b), the measurement was performed by hanging the door glass 4 of the measurement member 70 in Figure 4(a) from the ceiling and leaning a frame jig 72 against a wall (not shown) and attaching acceleration sensors 71 to a total of 25 locations in a 5 x 5 pattern on the door glass 4, which had a width W of 600 mm and a height H of 400 mm. The center X of the door glass 4 was struck with an impulse hammer to vibrate it, and the resulting vibrations were detected by the acceleration sensors 71. Note that because the vibrating center X could not be measured, the acceleration sensors 71 were attached only to the center, shifted 10 mm upward. The effectiveness was confirmed by taking the average vibration of the 25 measurement points.

[0036] Fig. 5 is a graph showing the degree of effect of an embodiment of the present invention, specifically, the degree of vibration damping effect at a frequency of 4 kHz relative to the distance h (Fig. 3) from the tip of the door glass 4 where the door glass-side tip 42 of the interior seal lip 41 abuts. In Fig. 5, the effect increases toward the right. The left end of Fig. 5 represents the case where the distance is 10 mm (conventional) from the tip of the door glass 4.

[0037] As is clear from Figure 5, the effect increases as the distance h from the edge of the door glass 4 decreases. The maximum effect is achieved at 2 mm, which is half the thickness of the door glass 4. Note that Figure 5 shows the results at a frequency of 4 kHz, but a similar trend to Figure 5 was observed in the frequency range from 2.5 kHz to 5 kHz, that is, the effect increases as the distance h from the edge of the door glass 4 decreases.

[0038] It should be noted that the vibration damping effect does not improve linearly with the distance h from the tip of the door glass 4, but rather the degree of damping effect gradually decreases as the distance h from the tip of the door glass 4 increases, but a significant vibration damping effect was confirmed up to 8 mm.

[0039] In this embodiment, a 4 mm door glass 4 is used, but the thinnest door glass is 3.1 mm thick, and the smallest radius of the tip is 1.6 mm, which is half the thickness of the door glass. Therefore, when using a 3.1 mm thick door glass, the tip 42 on the door glass side can be positioned 1.6 mm from the tip of the door glass 4 to achieve the above-mentioned effect.

[0040] The present invention provides a significant effect compared to the prior art when the door glass side tip 42 of the interior seal lip 41 that slides against the door glass 4 is at least half the thickness of the door glass 4 and not more than 8 mm from the tip of the door glass 4, but is more effective when it is at least half the thickness of the door glass 4 and not more than 6 mm, and even more effective when it is at least half the thickness of the door glass 4 and not more than 4 mm.

[0041] Fig. 6 shows a glass run 10 according to a second embodiment of the present invention, and is a view showing the vehicle interior side of the cross section corresponding to line AA in Fig. 1. In this second embodiment, as in the first embodiment, the abutment positions of the vehicle exterior seal lip 31 and the vehicle interior seal lip 41 against the door glass 4 are such that the vehicle interior seal lip 41 is closer to the leading end of the door glass 4, and the vehicle interior seal lip 41 has a unique feature, so only the vehicle interior side is shown.

[0042] A first interior support lip 43 and a contact rib 45 are formed on the interior side of the interior side wall 40 near the joint with the bottom wall 20 and toward the tip of the interior side wall 40. The first interior support lip 43 and the contact rib 45 abut against the curved portion of the door frame groove 5. In addition, an interior cover lip 46 is formed at the tip of the interior side wall 40.

[0043] The interior seal lip 41 has a first interior seal lip 47 extending from the exterior surface of the interior side wall 40, and a second interior seal lip 48 formed closer to the bottom wall 20 than the first interior seal lip 47. Both the first interior seal lip 47 and the second interior seal lip 48 extend toward the bottom wall 20.

[0044] The second interior seal lip 48 is formed thicker than the first interior seal lip 47 in order to increase the pressing force of the door glass 4 against the interior side surface of the vehicle.

[0045] The tip portions of the first interior seal lip 47 and the second interior seal lip 48 are formed with thick bulges 61, 62 that protrude toward the interior side wall 40, and when they come into sliding contact with the door glass 4, the tip portions of the first interior seal lip 47 and the second interior seal lip 48 bend, preventing a decrease in the pressing force against the interior side of the door glass 4.

[0046] Furthermore, bases 63, 64 that protrude from the interior side wall 40 toward the door glass 4 are formed at the root portions of the first interior seal lip 47 and the second interior seal lip 48 on the interior side wall 40. By forming the bases 63, 64, the lengths of the first interior seal lip 47 and the second interior seal lip 48 themselves can be further shortened and the resonance point of the transmitted sound can be shifted to the higher frequency side, thereby preventing the first interior seal lip 47 and the second interior seal lip 48 from vibrating due to the transmitted sound and preventing the generation of radiated sound due to the vibration inside the vehicle compartment. At the same time, the rigidity of the root portions of the first interior seal lip 47 and the second interior seal lip 48 can be increased.

[0047] Recesses 65, 66 are formed on the bottom wall 20 side of the upper part (vehicle exterior side) of the bases 63, 64. When the first interior seal lip 47 and the second interior seal lip 48 come into sliding contact with the door glass 4, the first interior seal lip 47 and the second interior seal lip 48 tend to collapse toward the bottom wall 20 starting from the recesses 65, 66, improving the ability to follow the door glass 4 and enabling smooth sliding contact between the first interior seal lip 47, the second interior seal lip 48 and the door glass 4 while maintaining an increased blocking effect of transmitted sound. Note that the recesses 65, 66 do not have to be formed.

[0048] Furthermore, a sub-lip 50 is formed between the second interior seal lip 48 and the bottom wall 20, protruding obliquely toward the interior side surface of the second interior seal lip 48 and toward the base of the second interior seal lip 48. The sub-lip 50 abuts against the interior surface of the second interior seal lip 48 when the door glass 4 slides against the second interior seal lip 48.

[0049] When the door glass side tip 42 of the second interior seal lip 48 slides against the door glass 4, the sub-lip 50 presses against the back surface of the second interior seal lip 48, increasing the pressure of the second interior seal lip 48 against the door glass 4. This allows the vibration energy generated when the door glass 4 vibrates due to vibrations of the vehicle body while driving to be efficiently absorbed, damping the vibration and reducing noise generation.

[0050] As shown by the relationship between the sizes of the arrows in Fig. 6, the pressing force of the second interior seal lip 48 against the door glass 4 is greater than that of the first interior seal lip 47. In the second embodiment, the greater the reaction force of the second interior seal lip 48 against the door glass 4 is than the reaction force of the first interior seal lip 47, the greater the effect that can be obtained.

[0051] In this second embodiment, as in the first embodiment described above, it was observed that in the frequency range from 2.5 kHz to 5 kHz, the vibration damping effect increases as the door glass side tip 42 of the second interior seal lip 48, which abuts against the door glass 4, approaches the tip of the door glass 4.

[0052] Therefore, by firmly holding the leading end of the door glass 4, the glass run 10 can efficiently absorb the vibration energy generated when the door glass 4 vibrates due to the vibration of the vehicle body while driving, thereby damping the vibration and reducing noise generation.

[0053] 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.

[0054] For example, in the first and second embodiments, the relationship between the interior seal lip and the door glass has been described, but the same can also be applied to the exterior seal lip. [Explanation of symbols]

[0055] 1. Front door 2 Door body 3 Door Frame 4 door glass 5 Door frame groove 10 Glass Run 20 Bottom Wall 30 Outside side wall 38 Outer seal lip 40 Inner side wall 41 Inner seal lip 42 Door glass side edge 47 No. 1 car inner seal lip 48 Second car interior seal lip 50 Sublip 70 Measuring member 71 Acceleration Sensor

Claims

[Claim 1] A glass run having a basic framework including a bottom wall, an exterior side wall, and an interior side wall, attached to a door frame, and guiding the raising and lowering of a door glass, an interior seal lip extending from the exterior surface of the interior side wall toward the bottom wall and in sliding contact with the interior side of the door glass; the interior seal lip includes at least a first interior seal lip and a second interior seal lip formed closer to the bottom wall than the first interior seal lip, a door glass-side tip end portion of the second interior seal lip that is in sliding contact with the door glass abuts on a position that is half or more and 8 mm or less of the thickness of the door glass from the tip end portion of the door glass, a pressing force of the second interior seal lip against the door glass is greater than that of the first interior seal lip, a sub-lip is formed between the second interior seal lip and the bottom wall, the sub-lip protruding obliquely from the exterior surface of the interior side wall toward the interior surface of the second interior seal lip, The glass run is characterized in that, when the door glass is in sliding contact with the second interior seal lip, the sub-lip abuts against an interior surface of the second interior seal lip.

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