JP3822751B2 - Seal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal structure for sealing a gap at a boundary portion between a front panel and a cowl upper in a vehicle or the like.
[0002]
[Prior art]
FIG. 4 is a perspective view showing a cab of a cab-over type truck. A front panel 2 of this type of cab 1 is pivotally attached to a cowl upper 3 on its upper side by a hinge 4, and the hinge 4 is centered. It can be opened and closed.
[0003]
As shown in an enlarged view in FIG. 5, a gap 5 extending in the vehicle width direction is formed at the boundary between the front panel 2 that opens and closes and the cowl upper 3 on the fixed side. In order not to enter, a flat portion 7 of a weather strip 6 having a cross-sectional shape of a letter shape is attached to an outer surface of a lower end portion of the cowl upper 3 via a retainer 8. 7 is pushed and bent by the upper end portion of the front panel 2 that moves on the track indicated by a two-dot chain line in the drawing, and is bent and deformed. The gap 5 is sealed by being brought into close contact with the upper end portion of the front panel 2 by the restoring force generated by (see FIG. 6).
[0004]
[Problems to be solved by the invention]
However, in such a conventional seal structure, the gap 5 is relatively large when the gap 5 at the boundary between the front panel 2 and the cowl upper 3 is different depending on the parts accuracy and assembly accuracy. There is a risk that the pressing force of the weather strip 6 against the upper end portion of the front panel 2 will be weakened at the part and the sealing performance may be lowered. In order to prevent such a reduction in sealing performance, even in a part where the gap 5 is relatively large If the curved surface portion 9 of the weather strip 6 is greatly deformed and the pressing force against the upper end portion of the front panel 2 is set to be large, this time, the deformation of the curved surface portion 9 of the weather strip 6 at the portion where the gap 5 is relatively small. As shown in FIG. 7, the front end side of the curved surface portion 9 of the weather strip 6 is stretched upward from the upper end portion of the front panel 2. There is a problem that significantly detract from the appearance is.
[0005]
The present invention has been made in view of the above circumstances, and in the case where the gap at the boundary between the upper end of the front panel and the lower end of the cowl upper is different in each part, the part where the gap is relatively large The object of the present invention is to hold the appearance of the weather strip so that the appearance of the weather strip can be pressed down at a portion where the gap is relatively small while the sealing property is maintained well.
[0006]
[Means for Solving the Problems]
The present invention provides a seal structure that seals the gap between the upper end portion of the front panel of a cab-over-type truck and the lower end portion of a cowl upper that is disposed above the front panel and pivotally attached to the front panel via a hinge. A strip body having a cross-sectional shape extending across the front panel and the cowl upper, a leading end of a curved surface portion extending from one end side of the flat surface portion forming the strip main body, and the other end side of the flat surface portion. A connecting portion that is connected and curved in the same direction as the curved surface portion, and a beam portion that is installed to be inclined so as to be gradually separated from the flat surface portion side from the midway position of the connecting portion toward the midway position of the curved surface portion. A weather strip having a hollow structure formed by integrally molding the weather strip, and attaching the flat portion of the weather strip to the outer surface of the lower end portion of the cowl upper. When the front panel is closed, the upper end of the front panel abuts upward from the lower side to the front end side of the connecting position of the beam portion in the curved surface when the front panel is disposed so as to curve upward toward the front of the vehicle. The curved surface portion and the connecting portion are configured to be able to be bent in a direction in which the curvature increases.
[0007]
Thus, when the front panel is closed, the upper end portion of the front panel abuts upward from below the connecting position of the beam portion in the curved surface portion of the weather strip, and the curved surface portion and the connecting portion of the weather strip have a curvature. It will be pushed and bent in the direction of increasing.
[0008]
At this time, the curved surface portion of the weather strip is supported at the tip and halfway positions by the connecting portion and the beam portion, respectively, and therefore hardly bends and deforms in the range from the tip to the connecting position of the beam portion. On the other hand, it is bent and deformed on the flat surface side near the connecting position, and the connecting portion of the weather strip is bent and deformed intensively and greatly on the tip side from the connecting position of the beam portion by the beam portion stretching between the curved portion and the curved portion. As a result, due to the deformation of the curved surface portion and the connecting portion, a moment is applied to the beam portion to bend and deform toward the flat portion side.
[0009]
Here, when the gap at the boundary between the front panel and the cowl upper is relatively large, the degree of deformation of the curved portion of the weather strip and the connecting portion is small, so the curved portion of the weather strip from the upper end portion of the front panel. Deformation that causes the tip to overhang is not induced, and the bending deformation acting on the beam portion is also small, so the amount of deformation of the beam portion is small.
[0010]
However, even if the degree of deformation of the curved surface portion and the connecting portion of the weather strip is small, in addition to the restoring force of the curved surface portion, the restoring force of the connecting portion that is bent and deformed intensively acts synergistically, Since the curved surface portion of the strip adheres to the upper end portion of the front panel with a sufficient pressing force, the gap at the boundary between the front panel and the cowl upper is reliably sealed.
[0011]
On the other hand, when the clearance between the front panel and the cowl upper is relatively small, the degree of deformation of the curved surface portion and the connecting portion of the weatherstrip increases, but at this time, bending deformation that acts on the beam portion is increased. Since the moment also increases, bending deformation toward the flat surface side of the beam portion also increases, and at the same time, a restoring force that causes the beam portion to return to the original straight extension state is also generated.
[0012]
At this time, the restoring force that the beam part tries to return to the original straight extension state is generated as a force that tries to push the gap between the curved surface part and the connecting part approached by the bending deformation of the beam part. Is already in a state of being greatly bent and deformed toward the curved surface side, and since this bending deformation is constrained by the gap, the restoring force of the beam portion is concentrated in the direction toward the curved surface portion and It acts to return the bending deformation to its original state, and the tip side of the curved surface portion slides with respect to the end portion of the front panel because the contact angle with the end portion of the front panel becomes shallow (small) due to the bending deformation. Since it becomes easy, the front-end | tip of the curved surface part of the weather strip which is going to protrude from the edge part of a front panel is suppressed by the restoring force of the said beam part, and does not protrude greatly.
[0013]
Further, in the present invention, it is preferable to form a notch portion that promotes bending deformation toward the flat portion side at a midway position of the beam portion. In this way, the beam portion is formed at the position where the notch portion is formed. It is possible to set so as to be bent and deform, and it is possible to effectively apply the restoring force of the beam portion by performing the optimum bending deformation as intended on the beam portion.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
1 to 3 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as in FIGS. 5 to 7 represent the same items.
[0016]
As shown in FIG. 1, in the present embodiment, as in the case of the conventional example described above with reference to FIGS. A seal structure that seals the gap 5 at the boundary between the seal strip and the seal structure is illustrated by employing a weather strip 10 as described in detail below.
[0017]
That is, the weather strip 10 employed in this embodiment is formed from a strip main body 11 having a cross-sectional shape extending in front of the front panel 2 and the cowl upper 3, and from the lower end side of the flat surface portion 12 forming the strip main body 11. A connecting portion 14 that connects the tip of the curved surface portion 13 that curves upward and extends to the upper end side of the flat surface portion 12 and is curved in the same direction as the curved surface portion 13, and the curved surface portion from a midway position of the connecting portion 14 13 has a hollow structure formed by integrally forming a beam portion 15 that is inclined so as to be gradually separated from the plane portion 12 side toward the middle position of the weather strip 10 thus formed. The flat surface portion 12 is attached to the outer surface of the lower end portion of the cowl upper 3 at the boundary portion via the retainer 8, and the curved surface portion 13 of the weather strip 10 curves upward toward the front of the vehicle. When the front panel 2 is closed, the upper end portion of the front panel 2 comes into contact with the front end side upward from the connecting position of the beam portion 15 in the curved surface portion 13, and the curved surface portion 13 And it is comprised so that the connection part 14 can be pushed and bent to the direction where a curvature becomes large.
[0018]
In the figure, reference numeral 16 denotes a notch formed at an intermediate position of the beam 15 on the side opposite to the plane 12 in order to promote bending deformation toward the plane 12 side.
[0019]
Thus, as shown in FIG. 2, when the front panel 2 is tilted and closed about the hinge 4, the upper end of the front panel 2 moves on the track indicated by the two-dot chain line in the drawing, The curved surface portion 13 of the strip 10 abuts on the tip side from the connecting position of the beam portion 15 upward from below, and the curved surface portion 13 and the connecting portion 14 of the weather strip 10 are pushed and bent in a direction in which the curvature increases.
[0020]
At this time, the curved surface portion 13 of the weather strip 10 is supported at the tip and halfway positions thereof by the connecting portion 14 and the beam portion 15, respectively, and therefore hardly bends and deforms in the range from the tip to the connecting position of the beam portion 15. The bent portion is bent and deformed mainly on the side of the plane portion 12 close to the connecting position of the beam portion 15. On the other hand, the connecting portion 14 of the weather strip 10 is connected to the curved surface portion 13. The bent portion is intensively bent and deformed on the tip side from the position, and due to the deformation of the curved surface portion 13 and the connecting portion 14, a moment is applied to the beam portion 15 to bend and deform toward the flat portion 12 side.
[0021]
Here, as shown in FIG. 2, when the gap 5 at the boundary between the front panel 2 and the cowl upper 3 is relatively large, the degree of deformation of the curved surface portion 13 and the connecting portion 14 of the weather strip 10. Therefore, deformation that causes the tip of the curved surface portion 13 of the weather strip 10 to protrude greatly from the upper end portion of the front panel 2 is not caused, and the bending deformation acting on the beam portion 15 is also small. Therefore, the deformation amount of the beam portion 15 is also small.
[0022]
However, even if the degree of deformation of the curved surface portion 13 and the connecting portion 14 of the weather strip 10 is small, in addition to the restoring force of the curved surface portion 13, the restoring force of the connecting portion 14 that is bent and deformed in a concentrated manner is synergistic. Since the curved surface portion 13 of the weather strip 10 is in close contact with the end portion of the front panel 2 with sufficient pressing force, the gap 5 at the boundary between the front panel 2 and the cowl upper 3 is surely sealed. become.
[0023]
On the other hand, as shown in FIG. 3, when the gap 5 at the boundary between the upper end portion of the front panel 2 and the lower end portion of the cowl upper 3 is relatively small, the curved portion 13 and the connecting portion 14 of the weather strip 10 are deformed. At this time, the bending deformation acting on the beam portion 15 also increases, so that the bending deformation toward the plane portion 12 of the beam portion 15 also increases, and at the same time, the beam portion 15 extends straight. The restoring force that tries to return to the state is also greatly generated.
[0024]
At this time, the restoring force that the beam portion 15 tries to return to the original straight extension state is generated as a force that tries to expand the interval between the curved surface portion 13 and the connecting portion 14 that are approached by bending deformation of the beam portion 15. The connecting portion 14 side is already in a state of being greatly bent and deformed toward the curved surface portion 13 side, and since this bending deformation is constrained by the gap 5, the restoring force of the beam portion 15 is directed to the curved surface portion 13. The curved surface portion 13 is concentrated in the direction so as to return the bending deformation of the curved surface portion 13 to the original state, and the curved surface portion 13 has a shallow (small) contact angle with the upper end portion of the front panel 2 due to the bending deformation. Therefore, the front end of the curved surface portion 13 of the weather strip 10 that is about to protrude from the upper end portion of the front panel 2 is Not overhang increases are held down by the restoring force of the beam portion 15.
[0025]
Therefore, according to the above embodiment, when the gap 5 at the boundary between the upper end portion of the front panel 2 and the lower end portion of the cowl upper 3 is different in each portion, the gap 5 is a relatively large portion. Since the overhanging of the weather strip 10 at a portion where the gap 5 is relatively small can be pressed in while maintaining the good sealing performance, the appearance can be held with good appearance.
[0026]
In particular, in the present embodiment, the notch 16 that facilitates bending deformation toward the flat surface 12 is formed in the middle of the beam 15, so the beam 15 is bent at the position where the notch 16 is formed. The beam portion 15 can be set so as to be deformed, and the beam portion 15 can be bent optimally as intended and the restoring force of the beam portion 15 can be effectively applied.
[0027]
It should be noted that the seal structure of the present invention is not limited to the above-described embodiments, and it is needless to say that various changes can be made without departing from the scope of the present invention.
[0028]
【The invention's effect】
According to the above-described seal structure of the present invention, various excellent effects as described below can be obtained.
[0029]
(I) According to the invention described in claim 1 of the present invention, when the gap at the boundary between the upper end of the front panel and the lower end of the cowl upper is different in each part, the gap is compared. Since the overhang of the weather strip at the portion where the gap is relatively small can be pressed while the sealing performance at the target large portion is kept well, the appearance can be held with good appearance.
[0030]
(II) According to the invention described in claim 2 of the present invention, the notch portion is formed at the midway position of the beam portion to promote bending deformation toward the plane portion side. It can be set so that it bends and deforms at a position, and the beam part can be optimally bent and deformed as intended to effectively apply the restoring force of the beam part.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a deformed state at a portion where the gap of the weather strip of FIG. 1 is relatively large.
3 is a cross-sectional view showing a deformed state at a portion where the gap of the weather strip of FIG. 1 is relatively small.
FIG. 4 is a perspective view showing a cab of a cab over type truck.
FIG. 5 is a VV arrow view of FIG. 4 showing a conventional example.
6 is a cross-sectional view showing a deformed state at a portion where the gap of the weather strip of FIG. 5 is relatively large.
7 is a cross-sectional view showing a deformed state at a portion where the gap of the weather strip of FIG. 5 is relatively small.
[Explanation of symbols]
2 Front panel 3 Cowl upper 5 Clearance 10 Weather strip 11 Strip body 12 Plane portion 13 Curved portion 14 Connection portion 15 Beam portion 16 Notch

Claims (2)

  A seal structure that seals the gap between the upper end of the front panel of a cab-over truck and the lower end of a cowl upper that is disposed above the front panel and pivotally attached to the front panel via a hinge. A strip main body having a cross-sectional shape extending across the panel and the cowl upper, and a tip of a curved surface portion extending from one end side of the flat surface portion forming the strip main body and the other end side of the flat surface portion; A connecting portion that is curved in the same direction as the curved surface portion and a beam portion that is installed so as to be gradually separated from the flat surface portion side from the midway position of the connecting portion toward the midway position of the curved surface portion are integrally formed. A weatherstrip having a hollow structure, and a flat surface portion of the weatherstrip is attached to an outer surface of a lower end portion of the cowl upper so that the curved surface portion of the weatherstrip is When the front panel is closed, the upper end portion of the front panel abuts upward from the lower side to the tip side from the connecting position of the beam portion in the curved surface portion when the front panel is closed. And the sealing structure characterized by being comprised so that a connection part can be pushed and bent to the direction where a curvature becomes large.   The seal structure according to claim 1, wherein a notch portion that promotes bending deformation toward the flat portion side is formed at a midway position of the beam portion.

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