JP4893107B2 - Weather Strip - Google Patents

Description

  The present invention relates to a weather strip provided along an edge of an opening of a vehicle body.

  A flange is formed along the edge of the opening of the vehicle body (for example, the opening of the luggage room), and a weather strip having a base portion and a seal portion is attached to the flange. And when an opening part is closed by an opening-and-closing part (for example, a luggage door), the seal part of a weather strip will be pressed and sealed.

FIG. 6 shows a conventional weather strip 100 in which the cross-sectional shape (cross-sectional shape orthogonal to the longitudinal direction) of the seal portion 102 is a hollow circular shape (see, for example, Patent Document 1 and Patent Document 2). ).
JP-A-61-228943 Japanese Patent No. 2589194

  Now, in the weather strip 100 as shown in FIG. 6, the seal portion 102 has a circular shape, so when the seal portion 102 is pressed, the apex portion of the seal portion 102 is recessed, as shown in FIG. In some cases, the seal surface of the seal portion 102 has two locations, a seal surface 102A and a seal surface 102B. Thus, when there are two seal surfaces (the seal surface 102A and the seal surface 102B) of the seal portion 102, the seal area is increased and the seal surface pressure is lowered, so that the sealability is lowered.

  The present invention has been made to solve the above problems, and an object thereof is to improve the sealing performance of the weather strip.

In order to achieve the above object, the weather strip according to claim 1 includes a base portion that is mounted along an edge of an opening of a vehicle body that is opened and closed by an opening and closing portion, and an arc portion provided on an upper portion of the base portion. A hollow seal portion provided at an upper portion of the arc portion and inclined to the center side of the arc up to the apex portion, and the center and the apex of the boundary portion with the base portion in the seal portion In a state where a straight line connecting the center of the part is arranged in the vertical direction and the apex part is arranged above, the seal portion is line-symmetrical with respect to the straight line, and more than a horizontal part intersecting a horizontal line. The upper part is the inclined part, the lower part is the arc part below the horizontal part, and the arcuate part is provided with a minimum thickness part with a minimum thickness, and the upper part with the minimum thickness part as a boundary. The apex portion and the lower base The thickness toward the boundary is characterized by being configured to be thicker in.

  The weather strip according to claim 1, wherein the hollow seal portion has an arc portion provided at an upper portion of the base portion and an inclined portion provided at an upper portion of the arc portion and tilted to the center side of the arc portion up to the apex portion. It has. That is, the seal portion has a shape in which the apex portion protrudes outward in the radial direction.

  Therefore, in a state where the opening / closing portion is closed and the seal portion of the weather strip is pressed and elastically deformed and sealed, only the apex portion of the seal portion of the weather strip is strongly pressed. That is, the seal surface becomes one place. Therefore, the sealing performance is good because the seal surface pressure is high.

Further, the seal portion has a line-symmetric shape with respect to a straight line connecting the center of the boundary portion with the base portion and the center of the apex portion. Therefore, for example, even if the posture of the weather strip changes, the seal portion is unlikely to fall down, so that the cross-sectional shape of the seal portion is not easily deformed. Therefore, the sealing surface of the seal portion is uniform, and the sealing performance is good.

Moreover, since the thickness of the inclined portion of the seal portion increases toward the apex portion, the rigidity increases toward the apex portion. Therefore, for example, even if a deformation that twists the seal portion is applied, the deformation that the top portion is recessed, that is, the seal surface pressure is reduced is suppressed. Therefore, only the apex portion reliably presses against the opening / closing portion.

In addition, the arcuate portion of the seal portion is provided with a minimum thickness portion that minimizes the thickness. Therefore, since the seal portion is elastically deformed starting from the minimum thickness portion of the arc portion, the reaction force is small. Therefore, the closing property when the opening / closing part is closed is improved.

Further, the arc portion of the seal portion is thicker toward the upper side and the lower side with the minimum thickness portion as a boundary. Therefore, the seal portion is elastically deformed starting from the minimum thickness portion of the arc portion more reliably.
The weather strip according to claim 2 is configured such that an angle formed by a line connecting the minimum thickness portion and the center of the arc and the horizontal line is 20 °.

As described above, according to the web-user strips of the present invention, high seal surface pressure because only the top portion of the sealing portion is pressed strongly. Therefore, the excellent effect that the sealing property is good is obtained.

  According to the weather strip of the second aspect, since the deformation of the cross-sectional shape of the seal portion can be suppressed, the seal surface of the seal portion becomes uniform, so that an excellent effect of good sealing performance can be obtained.

  As shown in FIG. 1, the weather strip 10 of this embodiment of the present invention has an elongated tube shape as a whole. In addition, the weather strip 10 includes a base portion 20 having an inverted U-shaped cross section and a hollow seal portion 30 protruding from the top portion. The base 20 has a body seal lip 22 protruding from one end. Further, the base 20 is formed with a holding lip 24 that protrudes from the inner surface toward the center. The weather strip 10 is formed by extruding an elastic material such as rubber.

  FIG. 2 shows a luggage room 52 portion of a vehicle body 50 of the automobile on which the weather strip 10 of the present embodiment is mounted. The arrow R points to the rear of the vehicle body, the arrow UP points upward, and the arrow OUT points to the outer side of the width direction of the vehicle body 50. Further, the opposite direction of the arrow R is the front of the vehicle body, the opposite direction of the arrow UP is the lower side, and the opposite direction of the arrow OUT is the inner direction of the vehicle body 50 in the width direction. Since the luggage room 52 is symmetrical in the width direction of the vehicle body 10, only the left side toward the front of the vehicle body is shown and described.

  The luggage room 52 takes in and out luggage from the opening 54. In addition, the central portion of the rear wall 56 is opened in a U shape when viewed from the rear side of the vehicle body so that luggage can be easily taken in and out. The opening 54 (luggage room 52) is opened and closed by a luggage door 56 (not shown in FIG. 2, see FIG. 3) having the same shape as the opening 54.

  As shown in FIG. 1, a flange 58 is formed on the edge 55 of the opening 54. Then, the weather strip 10 is attached to the flange 58 so that the flange 58 is sandwiched between the base portions 20 of the weather strip 10. The holding lip 24 of the base portion 20 holds the flange 58. Further, the body seal lip 22 of the base portion 20 is in contact with the body panel 59 and supports the weather strip 10.

  As shown in FIG. 3, when the luggage door 56 is closed, the luggage door 56 presses and elastically deforms the seal portion 30 of the weather strip 10, so that the apex portion 36 of the seal portion 30 of the weather strip 10 and the luggage door 56 Adheres to become a sealing surface and is sealed (details will be described later).

  Next, the cross-sectional shape orthogonal to the longitudinal direction (direction along the edge 55) of the seal portion 30 of the weather strip 10 will be described in detail.

  As shown in FIG. 4, the seal portion 30 of the weather strip 10 has a hollow tube shape. Although FIG. 4 is a cross-sectional view, hatching is omitted to avoid complication of the drawing.

  The cross-sectional shape of the hollow seal portion 30 is an arc portion 30A that is provided in the upper portion of the base portion 20 and has an arc shape from a boundary portion 32 with the base portion 20 to a portion that intersects the horizontal line X (hereinafter referred to as a horizontal portion 34). And an inclined portion 30B provided on the upper portion of the arc portion 30A and inclined from the horizontal portion 34 to the R-shaped apex portion 36 toward the center side (cross-sectional center side) of the arc. In other words, the substantially lower half of the seal portion 30 in the figure has a substantially semicircular shape with the upper part opened, and the substantially upper half has a substantially triangular shape with the lower part opened and the corners R. And since it was set as the inclination part 30B which inclined from the horizontal part 34 to the vertex part 36 in this way to the center side of a circular arc, the seal part 30B becomes a sharp shape toward the vertex part 36 (the vertex part 36 is It becomes a convex part protruding outward in the radial direction). Note that the radius R of the apex portion 36 is significantly smaller than the radius of the arc portion 30A.

  The cross-sectional shape of the seal portion 30 is axisymmetric with respect to a straight line Y connecting the center of the boundary portion 32 with the base portion 20 and the center of the apex portion 36.

  In the present embodiment, the seal portion 30 has a substantially lower half that is the arc portion 30A and a substantially upper half that is the inclined portion 30B, but is not limited thereto. For example, about 2/3 of the lower side of the seal part 30 may be an arc part and about 1/3 of the upper side may be an inclined part, or about 1/3 of the lower side of the seal part 30 may be an arc part and about 2/3 of the upper side. May be an inclined portion.

  In the present embodiment, the outer shape of the cross-sectional shape of the seal portion 30 is inscribed in the reference circle K. However, it is not necessarily inscribed. For example, the shape may be a horizontally long shape or a vertically long shape.

  Further, the seal portion 30 has a thickness t gradually increasing from the horizontal portion 34 to the apex portion 36, that is, the inclined portion 30 </ b> B toward the apex portion 36.

  Further, a minimum thickness portion 38 having a minimum thickness t is provided between the boundary portion 32 with the base portion 20 and the horizontal portion 34, that is, in the arc portion 30A. Then, the thickness t gradually increases toward the upper side and the lower side with the minimum thickness portion 38 as a boundary. In other words, the thickness t gradually decreases from the boundary portion 32 to the minimum thickness portion 38, and the thickness t gradually increases from the minimum thickness portion 38 to the horizontal portion 34. In the case of this embodiment, the minimum thickness portion 38 is provided at a position of about 20 ° (angle α in the figure) from the horizontal to the boundary portion 32 side.

  Next, the operation of the present invention will be described.

  As shown in FIGS. 1 and 2, the base 20 of the weather strip 10 is attached to the flange 58 of the edge 55 of the opening 54 of the luggage room 52 of the vehicle body 50. At the corner portion S of the edge portion 55 of the opening 54, the weather strip 10 is bent at a substantially right angle from the vehicle body outward direction to the vehicle body rearward direction. At the corner portion T, the weather strip 10 is bent in the vehicle body direction and obliquely downward. In such corner portions S and T, the posture and direction of the weather strip 10 change.

  The seal portion 30 of the weather strip 10 of the present embodiment has a cross-sectional shape that is line-symmetric with respect to a straight line Y that connects the center of the boundary portion 32 with the base portion 20 and the center of the apex portion 36. Therefore, even if the posture and direction of the weather strip 10 change at the corner portions S and T, the seal portion 30 is unlikely to fall down, so that the deformation amount of the cross-sectional shape of the seal portion 30 is small.

  FIG. 5 shows a cross-sectional shape of the seal portion 30 of the weather strip 10 from the portion A to the portion E in FIG. 2 in a state where the luggage door 56 is pressed and elastically deformed and crushed (sealed state). ing.

  Thus, in any part, only the apex portion 36 of the seal portion 30 of the weather strip 10 is a seal surface (contact surface with the luggage door 56) that is strongly pressed and sealed. This is because, as shown in FIG. 4, the seal portion 30 has a pointed shape toward the apex portion 36, so that the seal surface can be prevented from having two locations (or more). .

  Furthermore, since the thickness t of the seal portion 30 gradually increases from the horizontal portion 34 to the apex portion 36, the rigidity increases toward the apex portion 36 from the horizontal portion 34. Therefore, for example, even if a deformation that twists the seal portion 30 is applied, the deformation that causes the apex portion 36 to be recessed (ie, the seal surface pressure decreases) is suppressed. Therefore, only the apex portion 36 is surely pressed strongly against the luggage door 56 (the sealing surface is surely at one place).

  Further, a minimum thickness portion 38 having a minimum thickness t is provided between the boundary portion 32 of the seal portion 30 with the base portion 20 and the horizontal portion 34 (arc portion 30A). Moreover, the thickness t gradually increases toward the upper side and the lower side with the minimum thickness portion 38 as a boundary. Therefore, since the seal portion 30 is elastically deformed starting from the minimum thickness portion 38 of the arc portion 30A, the reaction force (the force for opening the luggage door 56) is small. Therefore, the luggage door 56 can be easily closed.

  Furthermore, since the arc portion 30A is greatly elastically deformed, the amount of elastic deformation of the inclined portion 30B is small. That is, the deformation of the inclined portion 30B that reduces the seal surface pressure is suppressed. Therefore, the apex portion 36 is surely pressed strongly against the luggage door 56 (the sealing surface is surely one place).

  As described so far, in the weather strip 10 of this embodiment, only the apex portion 36 of the seal portion 30 is strongly pressed against the luggage door 56 to become a seal surface. That is, there is only one seal surface, and there are no two locations (or three or more locations). Furthermore, since the deformation amount of the cross-sectional shape of the seal portion 30 when the weather strip 10 is attached to the edge portion 55 of the opening portion 54 of the luggage room 52 is small, the seal surface of the seal portion 30 becomes uniform. Therefore, the sealing performance is good (since the sealing surface pressure is high and the sealing surface is uniform).

  Further, since the reaction force (force for opening the luggage door 56) is small, the luggage door 56 can be easily closed.

  In addition, this invention is not limited to the said embodiment.

  For example, in the above-described embodiment, the weather strip 10 attached to the edge 55 of the opening 54 of the luggage room 52 has been described. However, the present invention is not limited to this. For example, the present invention can be applied to a weather strip provided at the edge of the door opening.

  Further, for example, in the above-described embodiment, as shown in FIG. 4, the cross-sectional shape of the seal portion 30 of the weather strip 10 is relative to a straight line Y connecting the center of the boundary portion 32 with the base portion 20 and the center of the apex portion 36. However, the present invention is not limited to this. Even a thing which is axisymmetric with respect to the straight line Y within the range where the effect of the present invention can be obtained is included in the present invention described in claim 1.

  Further, for example, in the above embodiment, the inclined portion 30 </ b> B of the seal portion 30 gradually increases in thickness t toward the apex portion 36, but is not limited thereto. For example, the thickness t of the inclined portion 30B may be uniform.

  Further, for example, in the above embodiment, the arc portion 30A of the seal portion 30 is provided with the minimum thickness portion 38 that minimizes the thickness t, and further on the upper side and the lower side with the minimum thickness portion 38 as a boundary. Although the wall thickness t has become thicker toward it, it is not limited to this. For example, the wall thickness t of the arc portion 30A may be uniform. Alternatively, the thickness t may be gradually increased only on the upper side or the lower side with the minimum thickness portion 38 as a boundary.

It is sectional drawing which shows the weather strip which concerns on embodiment of this invention. It is the figure which attached the weather strip which concerns on embodiment of this invention along the edge of the opening part of the luggage room of a vehicle body. It is a figure of the state which the weather strip is pressed and elastically deformed by the luggage door. It is a figure which shows the cross-sectional shape of the seal part of a weather strip. 2 shows a state where the weatherstrip is pressed by the luggage door and is elastically deformed, (A) is a view at a portion A in FIG. 2, (B) is a view at a portion B in FIG. 2, and (C) is a view in FIG. (D) is the figure in the site | part D of FIG. 2, (E) is the figure in the site | part D of FIG. It is sectional drawing which shows the weather strip which has the conventional hollow circle-shaped seal part. It is a figure of the state which the weather strip which has the conventional hollow circular seal part is pressed by the luggage door, and is elastically deformed, and there are two sealing surfaces.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Weather strip 20 Base 30 Seal part 30A Arc part 30B Inclined part 36 Apex part 38 Thickest thickness part 50 Car body 54 Opening part 55 Edge part 56 Luggage door (opening-closing part)

Claims (2)

A base mounted along the edge of the opening of the vehicle body that is opened and closed by the opening and closing unit;
A hollow seal portion having an arc portion provided at the upper portion of the base portion, and an inclined portion provided at the upper portion of the arc portion and tilted to the center side of the arc to the apex portion;
With
In a state where a straight line connecting the center of the boundary portion with the base portion in the seal portion and the center of the vertex portion is arranged in the vertical direction, and the vertex portion is arranged above,
The seal portion is
A line-symmetric shape with respect to the straight line,
The upper side of the horizontal part intersecting the horizon is the inclined part,
The lower side than the horizontal portion is the arc portion,
The arcuate portion is provided with a minimum thickness portion that minimizes the thickness,
A weather strip, wherein the thickness is increased from the minimum thickness portion toward the boundary portion between the upper apex portion and the lower base portion. The weather strip according to claim 1, wherein an angle formed by a line connecting the minimum thickness portion and the center of the arc and the horizontal line is 20 °.

Images