Sealing strip

Abstract

Provided is a sealing strip having an excellent effect of reducing transmission sound. The sealing strip (200) is provided with a mounting base part (10) which is mounted on the periphery of an opening and closing body (1) of a vehicle or the periphery of an opening of a vehicle body (2); a hollow sealing part (20) which is integrally formed with the mounting base part (10), is in elastic contact with the periphery of the opening on the vehicle body (2) side or the periphery of the opening on the opening and closing body (1) side when the opening and closing body (1) is closed, is made of sponge rubber, and is coated with a coating material (50) on the surface; wherein the hardness of the coating material (50) of the hollow sealing part (20) is 40.0 MPa or more.

Description

Technical Field

[0001] The present invention relates to a sealing strip which is installed around the periphery of an opening and closing body such as a side door, a rear door, a trunk lid, an engine hood, or around the opening of a vehicle body, and which elastically contacts the side of the vehicle body or the opening and closing body when the opening and closing body is closed to seal the opening and closing body and the vehicle body. Background Art

[0002] In the past, Figure 7 As shown, a sealing strip (door sealing strip) 100 is known, which has a mounting base 10 and a hollow sealing portion 20 made of sponge rubber. The mounting base 10 is mounted on the periphery of an opening and closing body 1 such as a door of a vehicle, and the hollow sealing portion 20 is integrally formed with the mounting base 10 and elastically contacts the periphery of the opening on the vehicle body 2 side when the opening and closing body 1 is closed (see, for example, patent document 1).

[0003] In such a sealing strip 100 , as long as the density of the sponge rubber material can be reduced, that is, the specific gravity can be reduced, the raw materials of the product can be reduced, resources can be saved, and it is also environmentally friendly.

[0004] However, it is also known that if the specific gravity of the sponge rubber material is reduced, the sound transmitted through the hollow seal portion 20 from the vehicle exterior to the vehicle interior (hereinafter referred to as transmitted sound) tends to increase according to the law of mass.

[0005] For example, the specific gravity of sponge rubber materials for extrusion molding used in door seals is generally known to be in the range of 0.45 to 0.70. In the case of using a sponge rubber material with a specific gravity of 0.40 for further weight reduction, Figure 8 As shown, compared with the sponge rubber material having a specific gravity of 0.53 and a specific gravity of 0.45, the transmitted sound reduction performance is significantly reduced, particularly between 2000 and 4000 Hz, which is a frequency that has a great influence on the human ear.

[0006] In such a case, for example, the transmission sound reduction effect can be obtained by increasing the thickness of the hollow sealing portion 20 , but this is not preferable because the compressive load of the weather strip increases, which deteriorates the closing performance of the door.

[0007] In addition, as another means of reducing transmitted sound, there is a method of forming a hollow sealing portion using a sponge rubber material or a solid rubber material with a high specific gravity (see, for example, Patent Document 2). Compared with a hollow sealing portion formed entirely of a sponge rubber material, this may cause the door closing performance to deteriorate due to the increase in compression load, and due to the use of multiple materials, the die structure used for extrusion molding is complex, resulting in increased costs, so there is room for further improvement.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent document 1: JP Patent No. 6470827;

[0011] Patent document 2: Japanese Patent Application Laid-Open No. 10-236163. Summary of the invention

[0012] An object of the present invention is to provide a weather strip having an excellent effect of reducing transmitted sound.

[0013] To achieve the above-mentioned purpose, the sealing strip (200) of the present invention comprises: a mounting base (10) which is mounted on the periphery of an opening and closing body (1) of a vehicle or the periphery of an opening of a vehicle body (2); a sealing portion (20) which is integrally formed with the mounting base (10) and elastically contacts the periphery of the opening of the vehicle body (2) or the periphery of the opening and closing body (1) when the opening and closing body (1) is closed, the sealing portion (20) being made of sponge rubber and having a coating (50) applied on the surface; and characterized in that:

[0014] The hardness of the sealing portion (20) is greater than 40.0 MPa.

[0015] In addition, the present invention is a sealing strip (200), which comprises: a mounting base (10) mounted on the periphery of an opening and closing body (1) of a vehicle or the periphery of an opening of a vehicle body (2); a sealing portion (20) formed integrally with the mounting base (10) and in elastic contact with the periphery of the opening of the vehicle body (2) or the periphery of the opening and closing body (1) when the opening and closing body (1) is closed, the sealing portion (20) being made of sponge rubber and having a coating (50) applied on the surface; and characterized in that:

[0016] The sponge rubber has a specific gravity in the range of 0.30 to 0.55.

[0017] The hardness of the sealing portion (20) is greater than 40.0 MPa.

[0018] In addition, the present invention is a sealing strip (200), which comprises: a mounting base (10) mounted on the periphery of an opening and closing body (1) of a vehicle or the periphery of an opening of a vehicle body (2); a sealing portion (20) formed integrally with the mounting base (10) and in elastic contact with the periphery of the opening of the vehicle body (2) or the periphery of the opening and closing body (1) when the opening and closing body (1) is closed, the sealing portion (20) being made of sponge rubber and having a coating (50) applied on the surface; and characterized in that:

[0019] The sponge rubber has a specific gravity in the range of 0.40 to 0.55.

[0020] The hardness of the sealing portion (20) is greater than 40.0 MPa.

[0021] In addition, the present invention is a sealing strip (200), which comprises: a mounting base (10) mounted on the periphery of an opening and closing body (1) of a vehicle or the periphery of an opening of a vehicle body (2); a sealing portion (20) formed integrally with the mounting base (10) and in elastic contact with the periphery of the opening of the vehicle body (2) or the periphery of the opening and closing body (1) when the opening and closing body (1) is closed, the sealing portion (20) being made of sponge rubber and having a coating (50) applied on the surface; and characterized in that:

[0022] The hardness of the sealing portion (20) is obtained based on the relationship between the hardness of the sealing portion (20) and the transmitted sound, and is a hardness that reduces the transmitted sound by 1 dB or more.

[0023] In addition, the present invention is a sealing strip (200), which comprises: a mounting base (10) mounted on the periphery of an opening and closing body (1) of a vehicle or the periphery of an opening of a vehicle body (2); a sealing portion (20) formed integrally with the mounting base (10) and in elastic contact with the periphery of the opening of the vehicle body (2) or the periphery of the opening and closing body (1) when the opening and closing body (1) is closed, the sealing portion (20) being made of sponge rubber and having a coating (50) applied on the surface; and characterized in that:

[0024] The hardness of the sealing portion (20) is obtained based on the relationship between the hardness of the sealing portion (20) and the transmitted sound measured by the nanoindentation method, and is a hardness that reduces the transmitted sound by 1 dB or more.

[0025] In addition, the present invention is a coating (50) applied to the surface of the sealing portion of a sealing strip (200), wherein the sealing strip (200) comprises: a mounting base (10) mounted on the periphery of an opening and closing body (1) of a vehicle or the periphery of an opening of a vehicle body (2); the sealing portion (20) is integrally formed with the mounting base (10) and elastically contacts the periphery of an opening of the vehicle body (2) or the periphery of an opening of the opening and closing body (1) when the opening and closing body (1) is closed, and the sealing portion (20) is made of sponge rubber; and is characterized in that:

[0026] The hardness of the coating (50) after drying is 40.0 MPa or more.

[0027] In addition, the reference numerals in parentheses indicate corresponding elements or corresponding matters described in the drawings and the detailed description to be described later.

[0028] According to the present invention, the sealing strip comprises: a mounting base, which is mounted on the periphery of the opening and closing body of the vehicle or the periphery of the vehicle body opening; a sealing portion, which is integrally formed with the mounting base and elastically contacts with the periphery of the vehicle body opening or the periphery of the opening and closing body when the opening and closing body is closed, and the sealing portion is made of sponge rubber and a coating is applied on the surface; in such a sealing strip, since the hardness of the sealing portion is made to be above 40.0 MPa, the transmitted sound of the sealing portion can be effectively reduced by more than 1 dB.

[0029] That is, although there has been a structure in which the surface of the sealing portion of the weather strip is treated by simply applying a paint, there has been no technology that focuses on the relationship between the hardness of the sealing portion of the weather strip for automobiles and the sound transmitted through the sealing portion. Figure 3 It is a very characteristic matter that there is no invention conception that the hardness of the sealing part, that is, the hardness of the coating film, is 40.0 MPa or more, when the relational expression shown is derived to surely reduce the transmitted sound of the sealing part by 1 dB or more.

[0030] At this time, the specific gravity of the sponge rubber constituting the sealing portion is a sponge rubber material in the range of 0.30 to 0.55, and more preferably a sponge rubber material in the range of 0.40 to 0.55. By making the specific gravity below 0.40, the sealing strip can be made lighter, and the raw materials of the product can be reduced, thereby saving resources and being environmentally friendly.

[0031] Furthermore, according to the present invention, the hardness of the sealing portion is obtained from the relationship between the hardness of the sealing portion and the transmitted sound, and is a hardness that reduces the transmitted sound by 1 dB or more, thereby effectively achieving reduction in the transmitted sound.

[0032] In addition, the hardness of the sealing portion can be accurately measured by the nanoindentation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 2 is a cross-sectional view showing a weather strip 200 according to an embodiment of the present invention.

[0034] Figure 2 It is shown Figure 1 The illustrated cross-sectional view is of a state where the sealing strip 200 is bent.

[0035] Figure 3 It is a graph showing the relationship between the hardness (MPa) of the sealing portion and the transmitted sound OA value (overall value) of 2000 to 4000 (dB).

[0036] Figure 4This is a graph comparing the hardness of the sealing portion measured by the nanoindentation method with a maximum indentation load of 100 μN while changing the specific gravity of the sponge rubber constituting the sealing portion.

[0037] Figure 5 This is a graph comparing the hardness of the sealing portion measured by the nanoindentation method with a maximum indentation load of 20 μN while changing the specific gravity of the sponge rubber constituting the sealing portion.

[0038] Figure 6 This is a graph showing the relationship between frequency and transmitted sound when no coating is applied to sponge rubber having a specific gravity of 0.40 constituting a sealing portion and when the coating of the present embodiment is applied.

[0039] Figure 7 It is a cross-sectional view showing a weather strip 100 according to a conventional example in a bent state.

[0040] Figure 8 This is a graph showing the relationship between the frequency and the transmitted sound when the specific gravity of the sponge rubber constituting the sealing portion is changed.

[0041] Description of Reference Numerals

[0042] 1 Opening and closing body (side door)

[0043] 2 Body

[0044] 10 Install the base

[0045] 20Hollow sealing part

[0046] 50 coatings

[0047] 100 sealing strips

[0048] 200 sealing strip DETAILED DESCRIPTION

[0049] For the sealing strip 200 according to the embodiment of the present invention, refer to Figure 1 as well as Figure 2 Provide explanation.

[0050] The sealing strip 200 is different from the sealing strip 100 ( Figure 7 ) is the same as the vehicle body, and comprises: a mounting base 10, which is mounted on the opening and closing body 1 of the vehicle, and is mounted on the side door 1 in this case; a hollow sealing portion 20, which is integrally formed with the mounting base 10 and elastically contacts with the opening periphery of the vehicle body 2 when the side door 1 is closed, and the hollow sealing portion 20 is made of sponge rubber and has a coating 50 applied on the surface.

[0051] In addition, for the previous example ( Figure 7 )The same parts are given the same figure marks.

[0052] In addition, the thickness of the coating 50 in the figure is only for easy understanding. The actual thickness of the coating is in μm (micrometers), and the thickness of the hollow sealing portion 20 is in mm (millimeter). Therefore, the thickness of the coating is approximately one thousandth of the thickness of the hollow sealing portion 20.

[0053] As the sponge rubber constituting the hollow sealing portion 20 of the weather strip 200 according to the embodiment of the present invention, a material having a specific gravity of 0.40 is used.

[0054] The hollow sealing portion 20 is a portion made of a rubber material mainly composed of EPDM (ethylene propylene diene monomer rubber), but is not limited to EPDM and may be a rubber material mainly composed of other synthetic rubbers or various thermoplastic elastomers.

[0055] Furthermore, the coating material 50 that makes the hardness of the hollow sealing portion 20 40.0 MPa or more is used.

[0056] Here, the coating material 50 that makes the hardness of the hollow sealing portion 20 40.0 MPa or more is used in order to reduce the transmitted sound of the hollow sealing portion 20 by 1 dB or more.

[0057] This is based on Figure 3 The relationship between the hardness of the hollow sealing portion 20 made of sponge rubber having a specific gravity of 0.40 and the OA value (comprehensive value) of the transmitted sound (2000 to 4000 Hz) is obtained from the equation shown in FIG.

[0058] Figure 3 After applying five kinds of coatings (samples A, B, C, D, and E) as shown in Table 1 onto the surface of the hollow sealing portion 20, the hardness of the hollow sealing portion 20 in the dry state of the coating is measured by the nanoindentation method, and the OA values ​​(comprehensive values) of the transmitted sound of the hollow sealing portion 20 corresponding to these hardnesses are plotted respectively, and a straight line approximate to the plotted position is obtained using Microsoft Excel (hereinafter referred to as Excel).

[0059] The measurement of transmitted sound is carried out as follows: after the sealing strip 200 is clamped by two clamps not shown in the figure (for example, the sealing strip 200 is fixed to the clamp on the lower side, and the clamp on the upper side is pressed against the hollow sealing portion 20 of the sealing strip 200), sound is input from one side of the hollow sealing portion 20 (one side of the gap between the upper and lower clamps clamping the sealing strip 200), and the sound is collected by a microphone on the other side (the other side of the gap between the upper and lower clamps clamping the sealing strip 200).

[0060] The relationship formula of the approximate straight line is the Excel approximate formula: y = -0.025x + 68.603 Determination coefficient: R 2=09169, it can be seen that there is a high correlation between the transmitted sound and the hardness of the hollow sealing portion 20.

[0061] Table 1

[0062]

[0063] The so-called nanoindentation method is a method for evaluating hardness only by calculation based on physical quantities (load and indentation depth) measured by a device, and the contact rigidity (rigidity) and contact depth are obtained to calculate the hardness and Young's modulus.

[0064] By controlling the amount of current flowing into the electromagnetic coil, an indentation load (magnetic force) is generated, and the indenter is pressed from above the paint sample to measure the displacement of the sample (how much the indenter can easily be pressed in).

[0065] In this embodiment, "UNHT3" manufactured by Anton Paar GmbH is used as a test device (nanoindentation tester), a Berkovich indenter is used as an indenter, the maximum indentation load of the indenter is set to 20 μN, and the load / unload speed is set to 600 μN / min, and the test is performed in accordance with ISO 14577. A square with a length of 10 mm and a width of 10 mm is cut out of the hollow sealing portion 20, and the square is used as a test body. The thickness of the test body is measured to be about 1.8 mm.

[0066] Assuming that the maximum indentation load of the indenter is 100 μN, Figure 4 As shown in FIG. 1 , when the same coating material is used, the specific gravity of the sponge rubber constituting the hollow sealing portion 20 is affected. When the specific gravity is 0.40, 0.44, and 0.55, the respective values ​​vary greatly. However, as shown in FIG. Figure 5 As shown in the figure, when the maximum indentation load of the indenter is 20 μN, the influence of specific gravity is extremely small, and the hardness can be measured with high accuracy.

[0067] according to Figure 3 The relationship shown (y=-0.025x+68.603) shows that the hardness required to reduce the transmitted sound by more than 1dB is 1(=68.603-67.603)=0.025x, which gives x=40.0MPa. That is, if a coating 50 with a hardness of more than 40.0MPa is used, the transmitted sound of the hollow sealing portion 20 can be reduced by more than 1dB.

[0068] For example, Figure 6 As shown, when samples B, D, and E (Table 1) are applied to the hollow sealing portion 20 composed of sponge rubber with a specific gravity of 0.40, the transmission sound reduction performance is greatly improved between 2000 and 4000 Hz compared to the case where the specific gravity is 0.40 and no coating is applied.

[0069] According to the weather strip 200 configured in this manner, since the hollow sealing portion 20 is lightweight using sponge rubber having a specific gravity of 0.40 and has a hardness of 40.0 MPa or more, the transmitted sound of the hollow sealing portion 20 can be reliably reduced by 1 dB or more.

[0070] That is, although there has been a structure in which the surface of the hollow sealing portion 20 of the sealing strip 200 is treated by simply applying a coating, there has been no technology that focuses on the relationship between the hardness of the hollow sealing portion 20 of the sealing strip 200 for automobiles and the sound transmitted through the hollow sealing portion 20, and there is no clear understanding of the relationship between the hardness and the sound transmitted through the hollow sealing portion 20. Figure 3 The fact that the relationship shown above is derived to reduce the transmitted sound of the hollow sealing portion 20 by 1 dB or more and the invention concept of making the hardness of the hollow sealing portion 20 40.0 MPa or more does not exist at all is a very characteristic matter.

[0071] In the present embodiment, an example is shown in which the coating 50 is applied to the surface of the sealing strip 200 that forms the hollow sealing portion 20 using a sponge rubber material with a specific gravity of 0.40 for the purpose of weight reduction. However, even if the coating 50 is applied to the surface of the sealing strip 200 using a sponge rubber material with a specific gravity in the range of 0.30 to 0.55, more preferably a sponge rubber material with a specific gravity in the range of 0.40 to 0.55, the transmitted sound of the hollow sealing portion 20 can be reliably reduced by more than 1 dB.

[0072] In addition, although the hardness of the hollow sealing portion 20 measured by the nanoindentation method is used when obtaining the relationship between the hardness of the hollow sealing portion 20 and the transmitted sound, other hardness measurement methods may be used. In addition, although the relationship between the hardness of the hollow sealing portion 20 and the transmitted sound is calculated based on the Excel approximate formula, other methods may be used.

[0073] In addition, in the present embodiment, the door seal 200 installed along the periphery of the side door 1 and elastically in contact with the periphery of the opening of the vehicle body 2 is used as an example for explanation, but on the contrary, it can also be a door seal installed along the periphery of the opening of the vehicle body 2 and elastically in contact with the periphery of the side door 1 when the door is closed. In addition, the hollow sealing portion 20 can also be a solid body such as a lip. In addition, any type of sealing strip can be applied to sealing strips installed on opening and closing bodies such as the back door, trunk lid, and engine hood of the car.

Claims

1. A sealing strip, comprising: a mounting base, which is mounted on the periphery of an opening and closing body of a vehicle or the periphery of a vehicle body opening; a sealing portion, which is integrally formed with the mounting base and elastically contacts the periphery of the vehicle body opening or the periphery of the opening and closing body when the opening and closing body is closed, the sealing portion is made of sponge rubber and has a coating applied on the surface; characterized in that: The sealing portion has a hardness of 40.0 MPa or more.

2. A sealing strip comprising: a mounting base, which is mounted on the periphery of an opening and closing body of a vehicle or the periphery of a vehicle body opening; a sealing portion, which is integrally formed with the mounting base and elastically contacts the periphery of the vehicle body opening or the periphery of the opening and closing body when the opening and closing body is closed, the sealing portion is made of sponge rubber and has a coating applied on the surface; characterized in that: The sponge rubber has a specific gravity in the range of 0.30 to 0.

55. The sealing portion has a hardness of 40.0 MPa or more.

3. A sealing strip, comprising: a mounting base, which is mounted on the periphery of an opening and closing body of a vehicle or the periphery of a vehicle body opening; a sealing portion, which is integrally formed with the mounting base and elastically contacts the periphery of the vehicle body opening or the periphery of the opening and closing body when the opening and closing body is closed, the sealing portion is made of sponge rubber and has a coating applied on the surface; characterized in that: The sponge rubber has a specific gravity in the range of 0.40 to 0.

55. The sealing portion has a hardness of 40.0 MPa or more.

4. A sealing strip comprising: a mounting base, which is mounted on the periphery of an opening and closing body of a vehicle or the periphery of a vehicle body opening; a sealing portion, which is integrally formed with the mounting base and elastically contacts the periphery of the vehicle body opening or the periphery of the opening and closing body when the opening and closing body is closed, the sealing portion being made of sponge rubber and having a coating applied on the surface; characterized in that: The hardness of the sealing portion is obtained from a relational expression between the hardness of the sealing portion and the transmitted sound, and is a hardness that reduces the transmitted sound by 1 dB or more.

5. A sealing strip comprising: a mounting base, which is mounted on the periphery of an opening and closing body of a vehicle or the periphery of a vehicle body opening; a sealing portion, which is integrally formed with the mounting base and elastically contacts the periphery of the vehicle body opening or the periphery of the opening and closing body when the opening and closing body is closed, the sealing portion is made of sponge rubber and has a coating applied on the surface; characterized in that: The hardness of the sealing portion is obtained from a relational expression between the hardness of the sealing portion and the transmitted sound measured by a nanoindentation method, and is a hardness that reduces the transmitted sound by 1 dB or more.

6. A coating applied to the surface of a sealing portion of a sealing strip, the sealing strip comprising: a mounting base, which is mounted on the periphery of an opening and closing body of a vehicle or the periphery of a vehicle body opening; the sealing portion, which is integrally formed with the mounting base and elastically contacts the periphery of the vehicle body opening or the periphery of the opening and closing body when the opening and closing body is closed, the sealing portion being made of sponge rubber; characterized in that: The hardness of the coating after drying is 40.0 MPa or more.

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