JP7660455B2 - Door Weather Strip - Google Patents

Description

The present invention relates to a door weather strip that is attached to an automobile door panel and provides a seal between the door panel and the body panel.

A conventional door weather strip is described in the following Patent Document 1.

Figure 1 is a side view of an automobile front door to which the door weather strips of the present invention and the prior art are applied, and Figure 6 is a cross-sectional view of line A-A in Figure 1 showing the conventional door weather strip.

As shown in FIG. 1, this door weather strip 1 is arranged in a closed loop around a front door (hereinafter referred to as the door) 2, which is made up of a door body 3 and a door sash portion 4.

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

The outer end of the mounting base 6 is provided with two upper and lower panel lips 10a, 10b that elastically contact the hemming flange 4c of the door sash 4.

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

In addition, between the inner panel 4a and the outer panel 4b of the door sash portion 4, there is provided a glass run 12 that slidably holds both sides of the upper end of the door glass 11 that moves up and down. This glass run 12 has a bottom wall portion 12a that is 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, side walls 12b and 12c that are integrally provided on both ends of the bottom wall portion 12a on the inside and outside of the vehicle, and a pair of seal lips 12d and 12e that are provided opposite the lower portions of the side walls 12b and 12c and are provided in sliding contact with both sides of the upper end of the door glass 11.

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.

JP 2012-228968 A

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.

The suction direction (indicated by the white arrow) of the door 2 is normal to the door glass 11, so depending on the inclination angle θ of the door glass 11 relative to the vehicle body, the hollow seal portion 7 will bend and deform, causing the contact position of the tip portion 7a against the vehicle body panel 9 to become unstable.

In other words, in the conventional door weatherstrip 1, the thickness of the hollow seal portion 7 made of sponge rubber is almost uniform throughout, so the shape of the collapse caused by elastic contact with the vehicle body panel 9 is easily changed by the inclination angle θ. In particular, the collapse 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 against the vehicle body panel 9 to become unstable.

As a result, the tip 7a of the hollow seal portion 7 may seal out from the vehicle body panel 9, or may become detached from the vehicle body panel 9, reducing the sealing pressure and causing a deterioration in sealing performance and sound insulation performance.

The present invention was devised in consideration of the technical problems of the prior art, and has as its object to provide a door weather strip that can prevent a decrease in sealing performance and sound insulation performance by suppressing a decrease in the sealing pressure of the tip of the hollow seal portion against the vehicle body panel.

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 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 body panel is divided from the boundary between the protrusion and the thick seal portion into a component force in the same direction as the protrusion and thick seal portion, and a component force perpendicular to this component force , and the entire protrusion and thick seal portion of the hollow seal portion are abutted against the inclined straight portion of the body panel so that 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 .

The present invention makes it possible to prevent deterioration of the sealing and sound insulation performance of the hollow seal portion when the vehicle is traveling at high speeds.

1 is a side view of a front door of an automobile to which door weather strips of the present invention and the prior art are applied; 2 is a cross-sectional view taken along line AA of FIG. 1 showing the door weather strip according to the present invention. 2 is a cross-sectional view taken along line AA in FIG. 1, showing the state of the door weather strip before the automobile is driven or during normal driving. 2 is a cross-sectional view taken along line AA in FIG. 1, showing the state of the door weather strip when the automobile is traveling at high speed. FIG. 5 is an enlarged view of part B in FIG. 4 . 2 is a cross-sectional view taken along line AA of FIG. 1 showing a conventional door weather strip.

Below, an embodiment of the door weather strip of the present invention will be described in detail with reference to the drawings.

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

As shown in FIG. 1, the upper part of the door body 3 of the front door 2 of an automobile vehicle has a door sash portion 4, which 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.

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 technology.

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.

As shown in FIG. 2, the door weatherstrip 21 includes a mounting base 22 that is attached and fixed to the inner panel 4a of the door sash 4 by clips 5, a hollow seal portion 23 that 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 from a substantially vertical direction when the door is closed, and a seal lip 24 that protrudes toward the outside of the vehicle from the outer 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.

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

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

The hollow seal portion 23 also has a protrusion 26 at the tip 23a that can elastically contact the vehicle body panel 9 when the door is closed, and a thick seal portion 27 that is formed from the protrusion 26 toward the inside of the vehicle and can elastically contact the vehicle body panel 9 together with the protrusion 26.

As shown in Figures 2 and 5, when the door is open and in its free state, the protrusion 26 is oriented above the door 2 and is formed approximately parallel to the mounting base 22. The protrusion 26 is formed along the longitudinal direction of the door weather strip 21, and the tip surface 26a is 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.

The thick seal portion 27 is formed continuously from the protrusion 26 toward the inside of the vehicle for a certain length L, and is formed along the longitudinal direction of the door weather strip 21, just like the protrusion 26. When the door is closed, the outer surface 27a of the thick seal portion 27 on the inside of the vehicle 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 inside end 23b of the vehicle, and is continuously connected to the inside end 23b.

In addition, between the inner panel 4a and the outer panel 4b of the door sash portion 4, a glass run 30 is provided to slidably hold both sides of the upper end of the rising and lowering door glass 11. As shown in FIG. 2, this glass run 30 is provided between the terminal flanges 4d, 4e of the inner and outer panels 4a, 4b, and has a bottom wall portion 31 that is directly abutted against the lower surface of the flat portion of the inner panel 4a that is bulged toward the inside of the vehicle, both side walls 32a, 32b that are integrally provided on both ends 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 that are provided opposite the lower portions of the both side walls 32a, 32b and are slidably provided on both sides of the upper end of the rising and lowering door glass 11.

A seal lip 35 is integrally formed on the underside of the bottom wall portion 31, against which the upper end surface of the door glass 11 abuts when the door glass 11 is raised.

At the lower ends of both side walls 32a, 32b, first and second molding lips 34a, 34b are provided, which are folded back in the opposite direction to the inside and outside seal lips 33a, 33b. These first and second molding lips 34a, 34b are designed 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 a clamped state together with the first and second support lips.

[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. As a result, the hollow seal portion 23 is deflected and deformed in a direction in which it is entirely crushed by the pressing force of the door 2. Note that the hollow seal portion 23 maintains approximately the same deflected and deformed state by the pressing force of the vehicle body panel 9 even when the automobile is normally traveling.

As described above, when the car is traveling at high speed, the pressure difference between the negative pressure outside the car and the atmospheric pressure inside the car causes the entire door 2 to move slightly toward the outside of the car through the closed door glass 11, as shown in Figure 4, which is known as the suction phenomenon. At this time, the suction direction for the door 2 (the direction of the white arrow in Figures 2 and 5) is the normal direction of the door glass 11, so depending on the inclination angle θ of the door glass 11 with respect to the car body, the hollow seal portion 23 is easily deformed and the contact position of the tip portion 23a against the car body panel 9 becomes unstable.

However, in this embodiment, by providing a protrusion 26 and a 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 elastically contacting the straight portion 9a of the vehicle body panel 9, that is, the direction of the sealing pressure of the hollow seal portion 23, is deformed so as to be parallel or nearly parallel to the suction direction X of the suction force.

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

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

This prevents the seal pressure of the hollow seal portion 23 from decreasing, and the seal can be kept tightly closed at all times. As a result, deterioration of the sealing performance and sound insulation performance can be sufficiently prevented.

In addition, 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, so that 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 decrease in the adhesion of the hollow seal portion 23 to the vehicle body panel 9 is suppressed, and the decrease in sealing performance can be suppressed.

The thick seal portion 27 is formed so as to gradually become thinner from the protrusion 26 to the vehicle 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 vehicle interior end 23b, the vehicle 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 changes in the contact position of the hollow seal portion 23 against the vehicle body panel 9 and reductions in the seal width caused by the suction force.

In addition, this embodiment eliminates the need for a retainer or other device supporting the bottom wall portion 31 of the glass run 30, as in the conventional technology, making it possible to lower the vehicle height.

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. In addition, the shape and size of the protrusion portion 26 can also be changed as desired depending on the specifications of the automobile.

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.

As examples of door weather strips based on the above-described embodiment, the following configurations are possible.

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.

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 against the vehicle body panel, that is, the direction of the sealing pressure of the hollow seal, deforms so that it is 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 reduction 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.

More preferably, the protrusion has an outer surface on the inside of the vehicle that elastically contacts the vehicle body panel when the door is closed, and the thick seal is formed continuous with the outer surface of the protrusion.

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, reducing the amount of deflection deformation of the hollow seal portion compared to the movement of the door. As a result, the decrease in adhesion of the hollow seal portion to the vehicle body panel is suppressed, and the decrease in sealing performance is suppressed.

More preferably, the thick seal portion is gradually thinner from the protrusion side to the end of the hollow seal portion on the vehicle interior side.

According to this aspect of the invention, the thick seal portion is formed so that it gradually becomes thinner from the protrusion to the inside end 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 inside end of the hollow seal portion is crushed and deformed gently, without being suddenly crushed and deformed.

This makes it possible to prevent 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.

1.21…Door weather strip 2…Door (front door)
Description of the Preferred Embodiments 3: Door body 4: Door sash portion 4a: Inner panel 4b: Outer panel 9: Vehicle body panel 9a: Straight portion 22: Mounting base portion 23: Hollow seal portion 23a: Tip portion 23b: Vehicle interior end portion 26: Projection portion 26a: Tip surface 26b: Outer surface 27: Thick seal portion 27a: Outer surface X: Suction direction

Claims (3)

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 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. 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. 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.

Images