JP2003055007A - Different thickness sandwich glass and glass structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously realize the thickness reduction for the purpose of a weight reduction and the assurance of the strength of glass panes and to prevent the rupture of an intermediate film even if an air bag is developed in the state of containing a crack. SOLUTION: The ratio of the thickness of the second glass pane (1b) to the thickness of the first glass pane (1a) of the sandwich glass formed by successively laminating the first glass pane (1a), the intermediate film 1c) and the second glass pane (1b) and bonding together these panes and the film is 0.6 to 0.9 and the thickness (t) is <=4 mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated glass of different thickness and a glass structure using the same, and more particularly to a laminated glass of different thickness used as a window glass for automobiles and a glass structure using the same.

[0002]

2. Description of the Related Art Conventionally, laminated glass has been used as a windshield for automobiles. Laminated glass is a film in which an organic resin film (intermediate film) such as polyvinyl butyral is sandwiched between two glass plates and bonded together, and unlike tempered glass, cracks do not self-propagate and shatter. A good field of view can be secured even if a part of the glass plate is damaged. In addition, even if the glass plate is broken when an accident occurs, the elasticity of the interlayer film can prevent the passenger from jumping out of the vehicle.

On the other hand, in the automobile industry, there is a strong social demand for weight reduction of the vehicle body and reduction of fuel consumption in consideration of recent environmental problems. Therefore, each automobile manufacturer has come to demand the weight reduction of parts from the component manufacturers, and the glass manufacturer is required to reduce the weight by thinning the window glass.

[0004]

However, if the thickness of the windshield is blindly thinned, the windshield becomes vulnerable to the impact of the deployed airbag and the collision of flying objects. However, the intermediate film may be torn. The damage of the interlayer film impairs the basic function of the laminated glass for preventing passengers from jumping out of the vehicle, and it is important to prevent such a situation.

The mechanism of windshield damage in the event of an automobile collision will now be described. Figure 6
FIG. 4 is an exploded perspective view showing a windshield and cracks generated in the windshield. Further, as shown in the figure, the windshield 20 is an outer plate 2 which is a glass plate outside the vehicle.
0a and the inner plate 20b, which is a glass plate on the inside of the vehicle, sandwich the intermediate film 20c and pressurize and press-bond them. Therefore, cracks may occur in either or both of the outer plate 20a and the inner plate 20b due to the deformation of the vehicle body or the impact of the deployed airbag in a collision accident or the like.

FIG. 7 (a) shows a cracked windshield immediately after the occurrence of a collision accident. As shown in the figure,
When a crack 20d is formed in the inner plate 20b due to a collision or the like, and the human body collides with the airbag deployed in such a state, the airbag comes into contact with a wide area of the windshield 20 and a pressing force is applied to a certain area of the windshield. Will join. Particularly in the passenger seat, unlike the driver's seat in which the airbag is supported by a steering wheel or the like, the deployed airbag comes into direct contact with the windshield, so that the pressure applied to the windshield becomes greater.

Further, FIG. 7 (b) shows the windshield after the airbag is deployed. As shown in the figure, the pressing force of the airbag applied to almost the entire surface of the windshield is concentrated on the weakest crack 20d in the windshield,
The outer plate 20a is deformed. Skin 2 when the yield force is exceeded
0a has a crack 20e, and the generation of the crack 20e allows the edge 20f of the inner plate 1b to freely move in the pressing direction (the direction of the arrow in the drawing), locally deforming the intermediate film 20c. Push down. As a result, when the kinetic energy of the passenger who collides with the airbag is large, the passenger may jump out of the vehicle through the gap of the torn intermediate film 20c.

As described above, there is a contradictory relationship between making a thin plate for weight reduction and ensuring the strength of a glass plate, and how to balance the two is a major issue. In particular, it is necessary to prevent the problem that the interlayer film is broken by the pressure of the airbag in which the cracked windshield is expanded.

The present invention is intended to solve such a problem, and at the same time realizes thinning for weight reduction and securing strength of a glass plate, and deploys an airbag in a cracked state. Even in this case, it is an object of the present invention to provide a laminated glass of different thickness which can prevent the interlayer film from breaking and a glass structure using the same.

[0010]

In order to achieve such an object, the present invention provides a laminated glass in which a first glass plate, an intermediate film, and a second glass plate are sequentially laminated and bonded together. Different thickness matching, wherein the ratio of the thickness of the second glass plate to the thickness of the first glass plate is 0.6 or more and 0.9 or less and the plate thickness is 4 mm or less. Provide glass. In one aspect of the present invention, the ratio of the thickness of the second glass plate to the thickness of the first glass plate is preferably 0.7 or more and 0.8 or less.

Further, in the present invention, in a glass structure of an automobile window in which a resin molding is attached to a peripheral portion of the laminated glass of different thickness, the first glass plate is mounted on the outside of the vehicle, and the first glass plate is attached to the outside. There is provided a glass structure characterized in that two glass plates are mounted inside a vehicle.

By using the present invention, it is possible to reduce the weight by thinning the plate and to secure the strength against the impact of the airbag and the like at the same time.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a cross-sectional view schematically showing a laminated glass according to one embodiment of the present invention, and FIG. 1B is a mathematical formula showing the characteristics of one embodiment of the present invention. Laminated glass 1 as shown in FIG.
Is a laminate of the outer plate 1a, the intermediate film 1c, and the inner plate 1b that are laminated and bonded together. Here, the thickness of the outer plate 1a is X
[Mm], the thickness of the inner plate 1b is Y [mm], the thickness of the intermediate film 1c is Z [mm], and the plate thickness of the laminated glass 1 is t (= X +).
Z + Y) [mm].

Further, as shown in FIG. 2B, in the present embodiment, the relationship between X, Y and t is 0.6 ≦ Y / X.
Each plate thickness is adjusted so as to satisfy both ≦ 0.9 and t ≦ 4 [mm]. It is particularly preferable to set 0.7 ≦ Y / X ≦ 0.8. By satisfying these relations, it is possible to realize the weight reduction and the securing of the strength of the laminated glass 1 at the same time, and it is possible to suppress the occurrence of the situation that the interlayer film is broken even when the human body collides with the deployed airbag. The above laminated glass 1
The present invention also includes a glass structure in which a resin molding is adhered to the peripheral edge of the glass in advance, or a metal fitting for attaching to a door or the like is attached. The resin molding or the like is attached in consideration of the mounting surfaces of the outer plate 1a and the inner plate 1b on the vehicle.

Next, an experimental apparatus for verifying the validity of the above numerical range will be described. FIG. 2 shows an apparatus for testing the influence on the laminated glass of the impact applied by the collision of the human body on the deployed airbag.
As shown in the figure, this experimental device is roughly divided into an air gun section, an air bag section, a specimen fixing section, and measurement and observation instruments. Therefore, this device is an air gun type impact experiment device that can be tested indoors, and a mechanism that ejects a metal impactor from the air gun part and applies an impact load to the laminated glass as the test piece via the airbag part Has become. That is, the collision of the human body with the airbag is simulated by the collision of the impactor.

The four pieces of the laminated glass 1 which are the test pieces are metal fixing frames (not shown) to which hard rubber is stuck inside.
It is sandwiched between the metal support member 5 and the metal support member 5, and these are fastened with bolts to be fixed on the base 4. An air bag 2 which is in contact with the laminated glass 1 in a predetermined range is installed in front of the laminated glass 1, and a felt sheet 3 is installed in front of the airbag 2 on a base 4 by a supporting member (not shown). There is.

Further, a photoelectric sensor 6 is attached to a portion protruding from the base 4 at a position separated from the felt sheet 3, and a speedometer 7 is attached to the photoelectric sensor 6. The photoelectric sensor 6 optically detects the passage of the impactor, and the speedometer 7 calculates the ejection speed of the impactor based on the detection result. Each part on the base 4 is covered with an acrylic fence 8 to prevent the impactor from scattering. An opening is provided in the fence 8 at a position substantially facing the photoelectric sensor, and an air gun 13 inserted from outside the fence 8 is provided.
One end of is fixed. The other end of the air gun 13 is connected to an air tank 12 fixed on a base plate 14 via a solenoid valve 12a.
1 is connected.

On the other hand, a compressor 9 is connected to the airbag 2 via a solenoid valve 10a and an air tank 10. The air tank 10 temporarily stores the high-pressure air compressed by the compressor 9, and when the solenoid valve 10a is opened, the high-pressure air is blown out at once and supplied to the airbag 2. Therefore, the airbag 2 is inflated by the action of the air tank 10, and the pressurization can be continued for a certain period of time. The airbag 10 is provided with a vent hole for bleeding air, similar to an airbag actually mounted in a vehicle, and has a structure in which surplus high-pressure air supplied escapes to the outside. Therefore, it is possible to prevent the internal pressure of the airbag 2 from becoming too high when the impactor collides.

Similarly, the air tank 12 temporarily stores the high-pressure air compressed by the compressor 11, and the solenoid valve 1
When 2a is opened, high pressure air is blown out at once and supplied to the air gun 13. Therefore, the impact of the impactor (not shown) inserted in the air gun 13 is accelerated by the action of the air tank 12, and is ejected toward the airbag 2.

The air gun 13 used in this experiment is
It is a metal tube having a length of 4.5 m and an inner diameter of 40 mm. The impactor has a mass of about 1.2 kg, and the maximum velocity when ejected from the air gun 13 is given up to about 38 m / sec, which corresponds to a maximum kinetic energy of about 850 J.

FIG. 3 is a plan view showing the laminated glass as seen from the line III-III 'in FIG. As shown in the figure, the laminated glass 1 has a vertical and horizontal length of 500 mm, which is half the thickness (thickness) of that used in the actual windshield in order to prevent the interlayer film from breaking even in the above-mentioned experimental apparatus. 0.38 mm) intermediate film is used. The area excluding the part fixed to the test piece fixing frame is 440 mm
× 440 mm, and the contact region 2a of the airbag 2 has a circular shape with a diameter of about 320 mm.

In this experiment, a collision experiment using a laminated glass having no cracks and a collision experiment in which at least one of the inner plate and the outer plate is cracked assuming a collision accident will occur. Then, the results of each experiment are compared.

FIG. 4 is a plan view showing the types of cracks provided in advance. As shown in the figure, cracks are provided in advance on each glass plate constituting the laminated glass 1 in the experiment. There are four ways of providing cracks as shown in FIG. FIG. 1A shows a type in which neither the inner plate 1b nor the outer plate 1a has a crack (hereinafter referred to as a normal type). FIG. 2B shows a type in which vertical cracks are provided only in the outer plate 1a which is a glass plate on the free surface side (hereinafter referred to as free surface side crack type).

FIG. 3C shows a type in which a vertical crack is provided only in the inner plate 1b which is a glass plate on the impact surface side (hereinafter referred to as impact surface side crack type). The same figure (d)
Is a type in which cracks are provided on both the inner plate 1b and the outer plate 1a, that is, vertical cracks are provided on the inner plate 1b and horizontal cracks are provided on the outer plate 1a (hereinafter referred to as double-sided crack type). In addition, the depth of the cracks provided in FIGS. 9B to 9D is such that the glass plate provided with the cracks completely penetrates.

Next, the experimental results will be described. Figure 5
FIG. 4 is a graph showing the relationship between the type of crack and the breaking energy of the interlayer film. Laminated glass 1 from air gun 13
The impact energy of the impactor, which is required to break the intermediate film, is regarded as the fracture energy of the intermediate film. As the types of the laminated glass 1, a laminated glass having an outer plate of 2.0 mm-an inner plate of 2.0 mm (hereinafter, referred to as 2.0-2.0 laminated glass), an outer plate of 2.0 mm-an inner plate of 1.6 mm.
Laminated glass (hereinafter referred to as 2.0-1.6 laminated glass), and an outer plate 2.0 mm-inner plate 1.1 mm laminated glass (hereinafter referred to as 2.0-1.1 laminated glass)
3 types were used.

As is apparent from (a) to (d) in the figure, the breaking energy gradually decreases from (a) to (d), and the intermediate film is easily broken. This indicates that the interlayer film is more likely to break as the number of cracks increases, and as is clear from (b) and (c), cracks are more likely to occur on the impact surface side than on the free surface side. It shows that the interlayer film is more easily torn when it enters.

Further, comparing the laminated glasses in (a) and (b), it is found that the breaking energy decreases as the plate thickness decreases. However, in (c) and (d), the breaking energy of the 2.0-1.6 laminated glass was the largest, and the result that the interlayer film was hard to break was obtained. This is because the inner plate with cracks is thinner and less rigid than the ones with 1.6 mm and 2.0 mm, so it is expected that the interlayer film is less likely to break than the 2.0-2.0 laminated glass. On the other hand, it was found that when the thickness of the inner plate was too thin like 2.0-1.1 laminated glass, the breaking energy was rather lowered, which was not preferable. Therefore, it was found that by making the thickness of the inner plate thinner than the thickness of the outer plate within a certain range, an excellent effect on the breakage of the interlayer film can be obtained.

Based on the above results, an experiment was carried out by adjusting the plate thicknesses X and Y. When the thickness was adjusted so as to satisfy 0.6 ≦ Y / X ≦ 0.9, the impact surface side crack type or double-sided With at least one of the crack types, favorable results regarding the durability of the interlayer film could be obtained. In particular, when 0.7 ≦ Y / X ≦ 0.8, both of the impact surface side crack type and the double-sided crack type have much larger breaking energy than those in the other numerical range, and favorable results can be obtained. It was

Further, the plate thickness t of the laminated glass 1 is 4 [m
m] or less, the weight of the windshield can be reduced. For example, as compared with a windshield using 2.0-2.0 laminated glass, the weight of the windshield using 2.0-1.6 laminated glass can be reduced by about 1 kg.

[0030]

As described above, according to the present invention, the ratio of the thickness of the second glass plate to the thickness of the first glass plate is 0.
It is 6 or more and 0.9 or less, and the plate thickness is 4 mm or less. By adopting this configuration, in the laminated glass having different thickness according to the present invention, the interlayer film is not easily torn even if the airbag is opened and the human body collides with the inner plate having cracks. Further, by making the thickness of the outer plate thicker than the thickness of the inner plate, there is an advantage that the windshield is less likely to be damaged even if a flying object such as a pebbles collides during traveling. Further, by attaching a resin molding or the like to the laminated glass according to the present invention in advance, there is an advantage that the manufacturing process of an automobile or the like can be simplified.

Further, the present invention can be applied not only to the windshield but also to the side glass, and can be applied to the applications such as moving bodies (trains, ships, airplanes, etc.) other than automobiles and buildings.

[Brief description of drawings]

FIG. 1 (a) is a cross-sectional view schematically showing a laminated glass according to one embodiment of the present invention, and (b) is a mathematical formula showing the characteristics of one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an apparatus for testing the influence of a shock applied by a human body colliding with a deployed airbag on laminated glass.

FIG. 3 is a plan view showing a laminated glass as a test piece.

FIG. 4 is a plan view showing types of cracks provided in advance.

FIG. 5 is a graph showing the relationship between the type of crack and the breaking energy of the interlayer film.

FIG. 6 is a plan view showing a crack generated on a windshield.

FIG. 7 (a) A windshield in an initial state,
(B) It is sectional drawing which shows the windshield after deployment of the airbag.

[Explanation of symbols]

1a: inner plate 1b: outer plate 1c: Intermediate film 2: Airbag 3: Felt sheet 4: Foundation 5: Support member 6: Photoelectric sensor 7: Speedometer 8: Fence 9: Compressor 10: Air tank 10a: Solenoid valve 11: Compressor 12: Air tank 12a: Solenoid valve 13: Air gun 14: Foundation

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Juhachi Oda             1-395 Matsumura, Kanazawa, Ishikawa Prefecture F-term (reference) 4G061 AA02 AA04 BA02 CA02 CB03                       CB19 CD02 CD18 DA23 DA38                       DA46

Claims (3)

[Claims] 1. A laminated glass in which a first glass plate, an intermediate film, and a second glass plate are sequentially laminated and bonded together, and the thickness of the second glass plate relative to the thickness of the first glass plate. The ratio is 0.6 or more and 0.9 or less, and
A laminated glass having a different thickness, which has a plate thickness of 4 mm or less. 2. The laminated glass of different thickness according to claim 1, wherein the ratio of the thickness of the second glass plate to the thickness of the first glass plate is 0.7 or more and 0.8 or less. 3. A glass structure for an automobile window in which a resin molding is attached to a peripheral edge portion of the laminated glass of different thickness according to claim 1 or 2, wherein the first glass plate is mounted on the outside of the vehicle, and The glass structure, wherein the second glass plate is mounted inside a vehicle.