Door Weather Strip

Abstract

To provide a door weather strip which can inhibit reduction of a seal pressure applied to a vehicle body panel by a hollow seal part and prevent reduction of seal performance and sound insulation performance.SOLUTION: In a door weather strip, a tip part 23a of a hollow seal part 23 elastically contacts with a vehicle body panel 9 to deflect and thereby seal a gap between a door panel and a vehicle body panel when a front door is closed. The tip part of the hollow seal part has: a projection part 26 which elastically contacts with the vehicle body panel when the door is closed; and a thick seal part 27 which is formed continuously with the projection part and elastically contacts with the vehicle body panel with the projection part. The projection part and the thick seal part are configured so that a direction of the pressure of the seal elastically contacting with the vehicle body panel is parallel to or substantially parallel to a door moving direction when the door is moved in a vehicle outer direction through door glass 11 by a negative pressure during travelling of the vehicle.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a door weatherstrip that is attached to an automobile door panel and provides a seal between the door panel and a vehicle body panel. [Background technology]

[0002] A conventional door weather strip is known from Patent Document 1 below.

[0003] FIG. 1 is a side view of an automobile front door to which door weather strips of the present invention and the prior art are applied, and FIG. 6 is a cross-sectional view taken along line AA in FIG. 1 showing the prior art door weather strip.

[0004] As shown in FIG. 1, the door weather strip 1 is disposed in a closed loop around a front door (hereinafter referred to as the door) 2 which is composed of a door main body 3 and a door sash portion 4.

[0005] The door weatherstrip 1 shown in FIG. 6 is disposed on the upper edge of a door sash portion 4 and comprises a mounting base 6 which is attached and fixed to the inner panel 4a of the door sash portion 4 with clips 5, a hollow seal portion 7 which is integral with the upper end of the mounting base 6 on the inside side of the vehicle and which elastically contacts the vehicle body panel 9 when the door is closed, and a seal lip 8 which protrudes from the mounting base 6 towards the outside of the vehicle and elastically contacts the vehicle body panel 9.

[0006] At the outer end of the mounting base 6, panel lips 10a, 10b that elastically contact the hemming flange 4c of the door sash 4 are provided in two stages, upper and lower.

[0007] The hollow seal portion 7 is formed with a substantially elliptical cross section, is molded with a substantially uniform width as a whole from a sponge rubber material having a lower specific gravity than the mounting base 6, and in the free state when the door is open, a tip portion 7a is formed to protrude in a substantially straight line toward the vehicle body panel 9, as shown by the dashed line in Figure 6.

[0008] Further, a glass run 12 is provided between the inner panel 4a and the outer panel 4b of the door sash portion 4 to slidably hold both side surfaces of the upper end of the door glass 11 which moves up and down. The glass run 12 has a bottom wall portion 12a arranged in contact with the lower surface of a reinforcement bracket (retainer) 13 which is a glass receiving member provided between the inner and outer panels 4a and 4b, both side walls 12b and 12c which are integrally provided on both end edges of the bottom wall portion 12a on the inside and outside of the vehicle, and a pair of seal lips 12d and 12e which are provided opposite the lower portions of the both side walls 12b and 12c and which are provided in slidable contact with both side surfaces of the upper end of the door glass 11.

[0009] When the door is closed, the tip 7a of the hollow seal portion 7 elastically contacts the vehicle body panel 9 (body side outer) as shown by the solid line in Figure 6, and is bent and deformed in the direction of being crushed by the pressing force of the door 2, while the sealing pressure of the tip 7a seals between the inside and outside of the vehicle and provides sound insulation. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2012-228968 A Summary of the Invention [Problem to be solved by the invention]

[0011] As is well known, when a car is traveling at high speed, for example, the pressure difference between the negative pressure outside the car and the atmospheric pressure inside the car causes a so-called suction phenomenon, which moves the entire door 2 slightly toward the outside of the car through the door glass 11, as shown by the white arrow in Figure 6.

[0012] Since the suction direction (direction of the white arrow) relative to the door 2 is normal to the door glass 11, depending on the inclination angle θ of the door glass 11 relative to the vehicle body, the contact position of the tip portion 7a against the vehicle body panel 9 due to the bending deformation of the hollow seal portion 7 becomes unstable.

[0013] That is, in the conventional door weatherstrip 1, the entire thickness of the hollow seal portion 7 made of sponge rubber material is almost uniform, so that the crushed shape caused by elastic contact with the vehicle body panel 9 is likely to change depending on the inclination angle θ. In particular, the crushed direction of the tip portion 7a of the hollow seal portion 7 changes in proportion to the amount of suction (amount of movement) of the suction phenomenon, which may cause the contact position with the vehicle body panel 9 to become unstable.

[0014] As a result, the tip 7a of the hollow seal portion 7 may seal out from the vehicle body panel 9 or may become separated from the vehicle body panel 9, reducing the sealing pressure and possibly deteriorating the sealing performance and sound insulation performance.

[0015] The present invention has been devised in consideration of the technical problems of the prior art, and has as its object to provide a door weather strip that can suppress a decrease in the sealing pressure of the tip of the hollow seal portion against the vehicle body panel, thereby preventing a deterioration in sealing performance and sound insulation performance. [Means for solving the problem]

[0016] a mounting base that is attached to a door panel of a vehicle; and a hollow seal portion that is integral with the mounting base and that elastically contacts the vehicle body panel when the door is closed. A door weather strip that seals between the door panel and the vehicle body panel by elastically contacting a tip portion of the hollow seal portion with the vehicle body panel and deforming the tip portion when the door is closed, the tip end of the hollow seal portion has a protrusion that elastically contacts the vehicle body panel when the door is closed, and a thick seal portion that is formed at a portion that elastically contacts the vehicle body panel together with the protrusion, When the door is moved toward the outside of the vehicle through the door glass due to negative pressure while the vehicle is traveling, the direction of the sealing pressure that the protrusion and thick seal portion of the hollow seal portion receive from the straight portion of the vehicle body panel is such that a component force in the same direction as the protrusion and thick seal portion from the boundary between the protrusion and the thick seal portion and a component force in a direction perpendicular to the component force are applied. The force is divided into two components, The direction of the resultant force is The protrusion and the entire thick seal of the hollow seal are brought into contact with the linear portion of the inclined vehicle body panel so that the direction is the normal to the direction in which the door glass is drawn out. It is characterized by the following. Effect of the Invention

[0017] According to the present invention, it is possible to prevent deterioration of the sealing performance and sound insulation performance of the hollow seal portion when the vehicle is traveling at high speed. [Brief description of the drawings]

[0018] [Figure 1] 1 is a side view of a front door of an automobile to which the door weather strips of the present invention and the prior art are applied; [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1, showing the door weather strip according to the present invention. [Diagram 3] 2 is a cross-sectional view taken along line AA in FIG. 1, showing a state of a door weather strip before the automobile is driven or during normal driving. [Figure 4] 2 is a cross-sectional view taken along line AA in FIG. 1, illustrating a state of a door weather strip when a car is traveling at high speed. [Diagram 5] FIG. 5 is an enlarged view of part B in FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, showing a conventional door weather strip. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a door weather strip of the present invention will be described in detail with reference to the drawings.

[0020] Figure 2 is a cross-sectional view taken along line AA in Figure 1, showing the door weatherstrip of the present invention attached to the door sash portion of an automobile front door, Figure 3 is a cross-sectional view taken along line AA in Figure 1, showing the state of the door weatherstrip of this embodiment before the automobile is moving or during normal driving, Figure 4 is a cross-sectional view taken along line AA in Figure 1, showing the state of the door weatherstrip of this embodiment when the automobile is moving at high speed, and Figure 5 is an enlarged view of part B in Figure 4.

[0021] As shown in FIG. 1, an upper portion of a door body 3 of a front door 2 of an automobile vehicle has a door sash portion 4, and this door sash portion 4 is formed by joining an end portion of an inner panel 4a on the inside of the vehicle and an end portion of an outer panel 4b on the outside of the vehicle by hemming.

[0022] In this embodiment, a retainer, which is a reinforcement bracket, is not interposed between the inner panel 4a and the outer panel 4b as in the conventional art.

[0023] A door weather strip 21 is provided on the outer periphery of the door sash portion 4 to seal between the vehicle body opening and the door.

[0024] As shown in FIG. 2, the door weatherstrip 21 comprises a mounting base 22 which is attached and fixed to the inner panel 4a of the door sash portion 4 with clips 5, a hollow seal portion 23 which is integral with the upper end of the mounting base 22 on the vehicle interior side and functions as a main seal portion by elastically contacting the straight portion 9a of the vehicle body panel 9 in a direction approximately perpendicular to the vehicle when the door is closed, and a seal lip 24 which protrudes toward the outside of the vehicle from the outer side end of the mounting base 22 and functions as a sub-seal portion by elastically contacting the underside of the curved outer periphery of the vehicle body panel 9.

[0025] The mounting base 22 is made of solid rubber and has a substantially rectangular cross section, is formed along the outer periphery of the door 2 including the door sash portion 4, and has two spaces 22a formed continuously along the longitudinal direction inside the mounting base 22, one on the vehicle inner side and one on the vehicle outer side. The mounting base 22 also has an insertion hole 22c formed through a bottom wall 22b into which the clip 5 is inserted. At the vehicle outer end of the mounting base 22, panel lips 25a, 25b that elastically come into contact with the hemming flange portion 4c of the door sash portion 4 are provided in two upper and lower stages.

[0026] The hollow seal portion 23 is formed with a substantially elliptical cross section and is made of a sponge rubber material having a lower specific gravity than the mounting base portion 22. In the free state when the door is open, a tip portion 23a is formed so as to protrude in a substantially straight line toward the straight portion 9a of the body panel 9, as shown by the dashed dotted line in FIG. 2.

[0027] In addition, the hollow seal portion 23 has a protrusion portion 26 provided at each tip portion 23a, which is capable of elastically contacting the vehicle body panel 9 when the door is closed, and a thick seal portion 27 formed from the protrusion portion 26 along the vehicle interior side and which is capable of elastically contacting the vehicle body panel 9 together with the protrusion portion 26.

[0028] 2 and 5, in a free state when the door is open, the protrusion 26 is oriented above the door 2 and is formed substantially parallel to the mounting base 22. The protrusion 26 is formed along the longitudinal direction of the door weather strip 21 and has a tip surface 26a formed in an arc shape. When the door is closed, the outer surface 26b of the protrusion 26 on the vehicle interior side excluding the tip surface 26a is in elastic contact with the straight portion 9a of the vehicle body panel 9.

[0029] The thick seal portion 27 is formed continuously from the protrusion 26 toward the interior of the vehicle for a certain length L, and is formed along the longitudinal direction of the door weatherstrip 21, like the protrusion 26. When the door is closed, the inner side outer surface 27a of the thick seal portion 27 elastically contacts the straight portion 9a of the vehicle body panel 9 together with the outer surface 26b of the protrusion 26. The thick seal portion 27 is gradually thinned from the protrusion 26 side of the hollow seal portion 23 to the inner side end 23b, and is continuously connected to the inner side end 23b.

[0030] Further, between the inner panel 4a and the outer panel 4b of the door sash portion 4, there is provided a glass run 30 for slidably holding both side surfaces of the upper end portion of the rising and lowering door glass 11. As shown in Fig. 2, this glass run 30 is provided between the terminal flange portions 4d, 4e of the inner and outer panels 4a, 4b, and has a bottom wall portion 31 arranged in direct contact with the lower surface of the flat portion of the inner panel 4a that is deformed to bulge toward the inside of the vehicle, both side walls 32a, 32b integrally provided on both end edges of the bottom wall portion 31 on the inside and outside of the vehicle, and a pair of inner and outer seal lips 33a, 33b provided opposite the lower portions of the both side walls 32a, 32b and slidably contacting both side surfaces of the upper end portion of the rising and lowering door glass 11.

[0031] A seal lip 35 is integrally formed on the lower surface of the bottom wall portion 31, with which the upper end surface of the door glass 11 abuts when the door glass 11 is raised.

[0032] First and second molding lips 34a, 34b are provided at the lower ends of both side walls 32a, 32b, folded back in the opposite direction to the vehicle interior and exterior seal lips 33a, 33b. The first and second molding lips 34a, 34b are adapted to hold the terminal flanges 4d, 4e of the outer and inner panels 4a, 4b inserted between the lower ends of both side walls 32a, 32b in the drawing in a sandwiched state together with the first and second support lips.

[0033] [Functions and Effects of the Door Weather Strip According to the Present Embodiment] When the automobile door 2 is closed, as shown by the solid line in Fig. 2 and in Fig. 3, the outer surface 26b of the protrusion 26 of the hollow seal portion 23 and the outer surface 27a of the thick seal portion 27 elastically contact the outer surface of the straight portion 9a of the vehicle body panel 9. This causes the hollow seal portion 23 to bend and deform in a direction in which it is entirely crushed by the pressing force of the door 2. Note that even when the automobile is normally traveling, the hollow seal portion 23 maintains approximately the same bent and deformed state due to the pressing force of the vehicle body panel 9.

[0034] Then, when the automobile is traveling at high speed, for example, as described above, due to the influence of the pressure difference between the negative pressure outside the vehicle and the atmospheric pressure inside the vehicle, the so-called suction phenomenon occurs in which the entire door 2 moves slightly toward the outside of the vehicle through the closed door glass 11 as shown in Fig. 4. At this time, since the suction direction with respect to the door 2 (the direction of the outlined arrow in Figs. 2 and 5) is the normal direction of the door glass 11, depending on the inclination angle θ of the door glass 11 with respect to the vehicle body, the contact position of the tip portion 23a with respect to the vehicle body panel 9 due to the flexural deformation of the hollow seal portion 23 is likely to become unstable.

[0035] However, in this embodiment, by providing the protrusion 26 and the thick seal portion 27 at the tip 23a of the hollow seal portion 23, the direction of the sealing pressure of the protrusion 26 and the thick seal portion 27 when they elastically contact the straight portion 9a of the body panel 9, i.e., the direction of the sealing pressure of the hollow seal portion 23, is deformed so as to be parallel or approximately parallel to the suction direction X of the suction force.

[0036] More specifically, the components of the sealing pressure that the protrusion 26 and thick seal portion 27 of the hollow seal portion 23 receive from the body side outer, which is the straight portion 9a of the vehicle body panel 9, are the components shown in Fig. 5. That is, if the boundary portion P between the protrusion 26 and the thick seal portion 27 is taken as the point of action, the pressure is divided from this point P into a component force F1 in the same direction as the protrusion 26 and the thick seal portion 27, and a component force F2 perpendicular to this component force F1, and the resultant force F of both the components F1 and F2 deforms so as to be parallel to the suction direction X of the suction force. That is, the tip portion 23a of the hollow seal portion 23 is deflected and deformed into the shape shown by the solid lines in Figs. 4 and 5.

[0037] Therefore, regardless of the inclination angle θ of the door glass 11 with respect to the vehicle body or the amount of suction (the amount of movement of the door), the tip end 23a of the hollow seal portion 23 does not change its falling manner, and its bending deformation is the same as the suction direction X. As a result, even if the suction force is generated, the abutment position of the tip end 23a of the hollow seal portion 23 with the vehicle body panel 9 is stabilized, and a sufficient seal width is ensured.

[0038] This prevents a decrease in the sealing pressure of the hollow seal portion 23 and allows the seal to be constantly maintained in a tight contact state, thereby sufficiently preventing a decrease in sealing performance and sound insulation performance.

[0039] In addition, since the protrusion 26 and the thick seal portion 27 are formed continuously and the outer surface 26b of the protrusion 26 and the outer surface 27a of the thick seal portion 27 are continuously and integrally formed, the seal width with respect to the straight portion 9a of the vehicle body panel 9 can be increased, and the seal rigidity is increased so that the amount of deflection deformation of the hollow seal portion 23 is smaller than the suction force with respect to the door 2 (door glass 11). As a result, the deterioration of the adhesion of the hollow seal portion 23 to the vehicle body panel 9 is suppressed, and the deterioration of the seal performance can be suppressed.

[0040] In addition, the thick seal portion 27 is formed so as to gradually become thinner from the protrusion 26 to the interior end 23b of the hollow seal portion 23, so that it acts to gradually absorb the pressure that the protrusion 26 and the thick seal portion 27 receive from the vehicle body panel 9 when the door is closed. In other words, if there is a step between the thick seal portion 27 and the interior end 23b, the interior end 23b of the hollow seal portion 23 may be suddenly crushed and deformed by the pressure, but due to the continuity, it is crushed and deformed gradually. This makes it possible to further suppress the change in the abutment position of the hollow seal portion 23 against the vehicle body panel 9 and the reduction in the seal width caused by the suction force.

[0041] Furthermore, in this embodiment, since a retainer or the like for supporting the bottom wall portion 31 of the glass run 30 as in the conventional technology is not required, it is possible to lower the vehicle height.

[0042] The present invention is not limited to the configuration of the above embodiment, and for example, the thickness and length of the thick seal portion 27 can be changed as desired depending on the specifications and size of the automobile. Also, the shape and size of the protrusion 26 can be changed as desired depending on the specifications of the automobile.

[0043] In addition, in this embodiment, the door weather strip applied to the front door 2 side has been described, but it can also be applied to the rear door side.

[0044] As the door weather strip based on the embodiment described above, for example, the following aspects are conceivable.

[0045] That is, a preferred embodiment of the door weather strip according to the present invention comprises an attachment base portion to be attached to a door panel of a vehicle, and a hollow seal portion that is integral with the attachment base portion and elastically contacts the vehicle body panel when the door is closed, A door weather strip that seals between the door panel and the vehicle body panel by elastically contacting a tip portion of the hollow seal portion with the vehicle body panel and deforming the tip portion when the door is closed, the tip end of the hollow seal portion has a protrusion that elastically contacts the vehicle body panel when the door is closed, and a thick seal portion that is formed at a portion that elastically contacts the vehicle body panel together with the protrusion, The protrusion and thick seal portion are configured so that when the door moves toward the outside of the vehicle through the door glass due to negative pressure while the vehicle is traveling, the direction of the seal pressure elastically contacting the vehicle body panel is parallel or nearly parallel to the direction of movement of the door.

[0046] According to this aspect of the invention, a protrusion and a thick seal are provided at the tip of the hollow seal, which are in elastic contact with the vehicle body panel, and the direction of the sealing pressure of the protrusion and the thick seal when they are in elastic contact with the vehicle body panel, i.e., the direction of the sealing pressure of the hollow seal, is deformed so as to be parallel or nearly parallel to the suction direction toward the outside of the vehicle that occurs during high-speed driving. Therefore, even if the suction force occurs, the decrease in the sealing pressure of the tip of the hollow seal against the vehicle body panel is suppressed, and a tight fit can always be maintained. As a result, a decrease in sealing performance and sound insulation performance can be sufficiently prevented.

[0047] More preferably, the protrusion has an outer surface on the inner side of the vehicle that elastically contacts the vehicle body panel when the door is closed, and the thick seal portion is formed continuously with the outer surface of the protrusion.

[0048] According to this aspect of the invention, the continuity between the outer surface of the protrusion and the thick seal portion allows the seal width to be increased relative to the vehicle body panel, and the seal rigidity is increased, so that the amount of deflection and deformation of the hollow seal portion is smaller compared to the movement of the door. As a result, the deterioration of the adhesion of the hollow seal portion to the vehicle body panel is suppressed, and the deterioration of the sealing performance is suppressed.

[0049] More preferably, the thick seal portion is formed so as to gradually thin from the protrusion side to the end of the hollow seal portion on the vehicle interior side.

[0050] According to this aspect of the invention, the thick seal portion is formed so as to gradually become thinner from the protrusion portion to the interior end portion of the hollow seal portion, so that when the door is closed, the pressure that the thick seal portion of the hollow seal portion receives from the vehicle body panel is gentle, and the interior end portion of the hollow seal portion is crushed and deformed gradually rather than suddenly.

[0051] This makes it possible to suppress changes in the contact position of the hollow seal portion against the vehicle body panel and reduction in the seal width caused by the suction force. [Explanation of symbols]

[0052] 1·21…Door weather strip 2...Door (front door) 3. Door body 4…Door sash section 4a…Inner panel 4b…Outer panel 9…Body panel 9a…Straight section 22…Mounting base 23…Hollow seal part 23a...Tip 23b…Inside end of the vehicle 26…Protrusion 26a…Tip surface 26b…Outer surface 27…Thick seal part 27a…External surface X: Suction direction

Claims

1. a mounting base portion that is attached to a door panel of a vehicle; and a hollow seal portion that is integral with the mounting base portion and that elastically contacts the vehicle body panel when the door is closed. A door weather strip that seals between the door panel and the vehicle body panel by elastically contacting a tip portion of the hollow seal portion with the vehicle body panel and deforming the tip portion when the door is closed, the tip end of the hollow seal portion has a protrusion that elastically contacts the vehicle body panel when the door is closed, and a thick seal portion that is formed at a portion that elastically contacts the vehicle body panel together with the protrusion, When the door moves toward the outside of the vehicle through the door glass due to negative pressure while the vehicle is traveling, the direction of the sealing pressure that the protrusion and thick seal portion of the hollow seal portion receive from the straight portion of the vehicle body panel is divided into a component force in the same direction as the protrusion and thick seal portion from the boundary between the protrusion and the thick seal portion, and a component force perpendicular to this component force, and the direction of the resultant force of both components is the same as the normal direction, which is the suction direction of the door glass, so that the entire protrusion and thick seal portion of the hollow seal portion is abutted against the inclined straight portion of the vehicle body panel.

2. 2. The door weather strip according to claim 1, The protrusion has an outer surface on the inside of the vehicle that elastically contacts the vehicle body panel when the door is closed. A door weather strip, wherein the thick seal portion is formed continuously with an outer surface of the protrusion.

3. The door weather strip according to claim 2, The door weather strip, wherein the thick seal portion is gradually thinner from the protrusion side to the end of the hollow seal portion on the vehicle interior side.

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