JP2007216893A - Back door seal structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent rain water and washing water from intruding into a cabin in a back door of a type that an upper door is closed after a lower door is closed. <P>SOLUTION: In the back door in which the upper door 2 is closed after the lower door 3 is closed and its lower end is superposed on an upper end of the lower door, a main seal 10 having a mounting base part 12 provided with a hollow seal part 11 resiliently contacted with the upper door and the lower door is mounted to a door opening peripheral edge of a body 1. To an indoor side surface of the lower end of the upper door, an extrusion molded part 21 resiliently contacted with an outdoor side surface of the upper end of the lower door and a door weather strip 20 having die molded parts 22 provided at both right and left side ends of the extrusion molded part. The die molded parts 22 is resiliently contacted in a straddling fashion from the outdoor side surface of the upper end at right/left sides of the lower door to the main seal 10. A first seal lip part 13 is provided projectedly from the outdoor side surface of the mounting base part 12 in the outdoor direction and a second seal lip part 23 resiliently contacted with the first seal lip part from the die molded part is projectedly provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seal structure in a back door for an automobile, which is composed of an upper door and a lower door that are opened and closed separately, and closes the upper door after the lower door is closed.

As shown in FIG. 7, the back door of the automobile is composed of an upper door 2 and a lower door 3, each of which is opened and closed independently, and after closing the lower door 3, There is a structure in which the upper door 2 is closed in a state where the parts overlap.
As such a back door seal structure, as shown in FIGS. 7 to 9, a main seal 30 is attached along the peripheral edge of the door opening of the body 1, and a door weather strip is formed along the inner surface of the lower end portion of the upper door 2. 40 is attached. The door weather strip 40 was raised in a direction extending along the surface of the upper door 2 from both ends of the extrusion molding portion 41 extending horizontally, and in a direction perpendicular to the extrusion molding portion 41. It consists of a molded part 42.

  As shown in FIGS. 10 and 11, when both doors 2 and 3 are closed, the inner end surfaces of the upper door 2 and the lower door 3 are brought into elastic contact with the main seal 30, and the door weather strip 40 of the upper door 2. The outer side surface of the upper end portion of the lower door 2 is elastically contacted, and the mold forming portion 42 of the door weather strip 40 is elastically contacted across the main seal 30 from the upper end portion of the lower door 3 to provide a sealing property. Is secured.

  Note that the upper door 2 and the lower door 3 are respectively brought into elastic contact with the main seal 30 in the upper part and the lower part from the mold part 42 as shown in FIG. Moreover, the extrusion molding part 41 of the door weather strip 40 is made to elastically contact the lower door 3, as shown in FIG.

Conventionally, in order to improve the sealing performance of the back door, as shown in FIG. 16, a secondary seal 52 is projected from the hollow seal portion 51 of the weather strip 50 and elastically contacted with the door glass 60. (For example, refer to Patent Document 1).
JP-A-9-1332035

However, in the conventional back door seal structure described above, the molded part 42 of the door weather strip 40 is elastically contacted across the main seal 30 from the upper end of the lower door 3. Since there is a plate thickness, as shown in FIGS. 11, 14, and 15, a step is formed in the portion directly above the lower door 3, and the upper door 3 has an upper end portion between the mold forming portion 42 and the main seal 30. A gap G corresponding to the wall thickness is formed.
And the problem that water W, such as rain water and car wash water, will infiltrate into the room from the gap G occurs.

  In the prior art described in Patent Document 1, since the secondary seal 52 protrudes from the hollow seal portion 51, the hollow seal portion 51 is made of sponge and has low rigidity, and the door glass 60 has a hollow seal. When the portion 51 is elastically contacted, the hollow seal portion 51 is greatly elastically deformed, so that the elastic contact force of the secondary seal 52 with respect to the door glass 60 is weakened, and the secondary seal 52 cannot exhibit sufficient sealing performance. is there.

  Accordingly, an object of the present invention is to provide an upper door and a lower door that open and close independently, and in a back door of an automobile that closes the lower door and then closes the upper door. An object of the present invention is to provide a back door seal structure that can reliably prevent intrusion.

In order to achieve the above object, the invention according to claim 1 of the present invention includes an upper door (2) and a lower door (3) that open and close independently, and after the lower door (3) is closed. An automobile back door of the type in which the upper door (2) is closed and the lower end of the upper door (2) is overlapped with the upper end of the lower door (3), and the door opening ( 1a) A main seal (10) having a mounting base (12) integrally formed with a hollow seal portion (11) elastically contacting the inner peripheral end surfaces of the upper door (2) and the lower door (3) is attached to the periphery. The upper door (2) has a lower end portion on the inner side surface of the lower door (3), and a horizontally extending extruded portion (21) elastically contacting the outer surface of the lower door (3), and both left and right sides of the extruded portion (21). In the direction along the surface of the upper door (2) at the end and against the extruded part (21) A door weather strip (20) having a molded part (22) raised in a straight direction is attached, and the molded part (22) is connected to the outer side surface of the upper left and right sides of the lower door (3). The lower door (3) is located at the upper part of the lower door (3) and is elastically contacted across the main seal (10).
At least at the position of the upper portion of the lower door (3) where the lower door (3) does not exist, the first seal lip portion (13) projects outward from the vehicle outer surface of the mounting base portion (12) of the main seal (10). And a second seal lip portion (23) elastically contacting the first seal lip portion (13) from the mold forming portion (22) of the door weather strip (20).

The invention according to claim 2 includes an upper door (2) and a lower door (3), each of which opens and closes independently. After closing the lower door (3), the upper door (2) is closed, and the upper door An automobile back door of the type in which the lower end of (2) is overlapped with the upper end of the lower door (3), and the upper door (2) is provided at the periphery of the door opening (1a) of the body (1) where the back door is provided. ) And the lower door (3) are fitted with a main seal (10) having a mounting base (12) integrally formed with a hollow seal portion (11) where the inner peripheral end surface of the vehicle is in elastic contact with the lower end of the upper door (2). On the inner surface of the vehicle, there is a horizontally extending extruded portion (21) that elastically contacts the outer surface of the upper end of the lower door (3), and the surface of the upper door (2) at the left and right ends of the extruded portion (21). Molding in the direction along the vertical direction and perpendicular to the extruded part (21) A door weatherstrip (20) having (22) is attached, and further, the mold forming part (22) is moved from the vehicle outer surface of the upper left and right sides of the lower door (3) to the bottom where the lower door (3) is not present. A seal structure that elastically contacts the main seal (10) at a position above the door (3),
At least at the position of the upper portion of the lower door (3) where the lower door (3) does not exist, the front end portion projects from the outer surface of the mounting base portion (12) of the main seal (10) to the mold forming portion (22). A seal lip (14) having a substantially L-shaped cross section in contact therewith is provided.

Furthermore, the invention described in claim 3 includes an upper door (2) and a lower door (3), each of which opens and closes independently. After closing the lower door (3), the upper door (2) is closed, and the upper door An automobile back door of the type in which the lower end of (2) is overlapped with the upper end of the lower door (3), and the upper door (2) is provided at the periphery of the door opening (1a) of the body (1) where the back door is provided. ) And the lower door (3) are fitted with a main seal (10) having a mounting base (12) integrally formed with a hollow seal portion (11) where the inner peripheral end surface of the vehicle is in elastic contact with the lower end of the upper door (2). On the inner surface of the vehicle, there is a horizontally extending extruded portion (21) that elastically contacts the outer surface of the upper end of the lower door (3), and the surface of the upper door (2) at the left and right ends of the extruded portion (21). Formed in the direction along the vertical direction with respect to the extruded portion (21). A door weatherstrip (20) having a portion (22) is attached, and further, the mold molding portion (22) is not present from the vehicle outer side surface of the upper left and right sides of the lower door (3). The lower door (3) has a seal structure that elastically contacts the main seal (10) at a position above the lower door (3),
At least at the position of the upper portion of the lower door (3) where the lower door (3) does not exist, the tip portion projects from the molding portion (22) to the vehicle outer surface of the mounting base portion (12) of the main seal (10). A seal lip (24) having a substantially L-shaped cross section in contact therewith is projected.

The invention according to claim 4 includes an upper door (2) and a lower door (3), each of which opens and closes independently. After closing the lower door (3), the upper door (2) is closed, and the upper door An automobile back door of the type in which the lower end of (2) is overlapped with the upper end of the lower door (3), and the upper door (2) is provided at the periphery of the door opening (1a) of the body (1) where the back door is provided. ) And the lower door (3) are fitted with a main seal (10) having a mounting base (12) integrally formed with a hollow seal portion (11) where the inner peripheral end surface of the vehicle is in elastic contact with the lower end of the upper door (2). On the inner surface of the vehicle, there is a horizontally extending extruded portion (21) that elastically contacts the outer surface of the upper end of the lower door (3), and the surface of the upper door (2) at the left and right ends of the extruded portion (21). Molding in the direction along the vertical direction and perpendicular to the extruded part (21) A door weatherstrip (20) having (22) is attached, and further, the mold forming part (22) is moved from the vehicle outer surface of the upper left and right sides of the lower door (3) to the bottom where the lower door (3) is not present. A seal structure that elastically contacts the main seal (10) at a position above the door (3),
At least at the position of the upper portion of the lower door (3) where the lower door (3) does not exist, the seal lip (25, 26) whose tip portion elastically contacts the body (1) protrudes from the mold forming portion (22). It was set up.

  Symbols in parentheses indicate corresponding elements or corresponding matters described in the drawings and the best mode for carrying out the invention described later.

According to the back door seal structure of the first aspect of the present invention, the molded portion is elastically extended across the main seal at the position of the upper portion of the lower door where the lower door does not exist from the vehicle outer surface of the upper left and right ends of the lower door. The seal structure is in contact, and at least at the position of the upper part of the lower door where there is no lower door, the first seal lip is projected outward from the vehicle outer surface of the main seal mounting base to mold the door weather strip. Since the second seal lip portion that elastically contacts the first seal lip portion from the portion protrudes, the first seal lip portion and the second seal lip portion can block intrusion of water such as rain water and car wash water.
Therefore, it is possible to prevent water from reaching the gap formed between the molded part of the door weather strip and the main seal, and to prevent entry into the vehicle.

Further, since the first seal lip portion protrudes from the mounting base portion that does not elastically deform like the hollow seal portion, unlike the case where the first seal lip portion protrudes from the sponge hollow seal portion as in the prior art, the posture is changed. Can be kept stable.
Therefore, the tip end portion of the first seal lip portion can be firmly elastically contacted with the second seal lip portion protruding from the mold forming portion of the door weather strip, thereby reliably preventing water from reaching the gap. .

Further, according to the back door seal structure of the second aspect, the seal lip has a substantially L-shaped cross section projecting from the vehicle outer surface of the mounting base portion of the main seal so that the tip portion elastically contacts the mold forming portion. Thus, it is possible to prevent water from reaching the gap between the molded part and the main seal.
Thus, it is possible to reliably prevent water from entering the vehicle through the gap.

  Further, since the seal lip protrudes from the mounting base, the posture can be stably maintained. Therefore, it is possible to securely prevent the water from reaching the gap by firmly elastically contacting the tip portion thereof with the mold part of the door weather strip.

  Furthermore, according to the invention described in claim 3, since the seal lip having a substantially L-shaped cross section protruding from the mold forming portion to the vehicle outer surface of the mounting base portion of the main seal protrudes from the mold portion, It is possible to prevent the vehicle from reaching and entering the vehicle from there.

  Further, according to the invention of claim 4, since the seal lip whose tip portion elastically contacts the body protrudes from the mold forming portion, it is possible to prevent water from reaching the gap and entering the vehicle from there. Can be prevented.

(First embodiment)
With reference to FIG. 1 thru | or FIG. 4, the back door seal structure which concerns on 1st embodiment of this invention is demonstrated. FIG. 1 is a cross-sectional view showing a back door seal structure, which corresponds to the line AA in FIG. 2 corresponds to the line BB in FIG. 3 shows the main seal 10 constituting the same, and FIG. 4 shows a mold forming portion 22 of the door weather strip 20. The same parts as those shown in the past are denoted by the same reference numerals. The basic structure of the back door seal structure is the same as that of the prior art shown in FIGS.

  As shown in FIG. 7, the back door seal structure according to the present embodiment includes an upper door 2 and a lower door 3 that open and close independently, and after the lower door 3 is closed, This is a back door for a vehicle of the type in which the door 2 is closed and the lower end portion of the upper door 2 is overlapped with the upper end portion of the lower door 3 on the vehicle exterior side.

Further, in this back door seal structure, a hollow seal portion 11 with which the inner peripheral end surfaces of the upper door 2 and the lower door 3 are elastically contacted is integrally formed on the periphery of the door opening 1a of the body 1 where the back door is provided. A main seal 10 having a mounting base 12 assembled to 1 is mounted. The mounting base portion 12 has a substantially U-shaped cross section, and is provided with four lips on the inside, and is mounted so as to sandwich the flange F standing from the body 1 with the four lips. The hollow seal portion 11 is provided on a surface that connects the vehicle outer surface (the left surface in FIG. 1) and the vehicle inner surface (the right surface in FIG. 1) of the mounting base 12. Note that a core material 15 is embedded in the mounting base 12 in order to increase its rigidity. The hollow seal portion 11 is preferably made of sponge, but can also be made of solid.
Further, on the inner side surface of the lower end portion of the upper door 2, a horizontally extending extruded portion 21 that elastically contacts the outer surface of the upper end portion of the lower door 3, and the surface of the upper door 2 at both left and right end portions of the extruded portion 21. A door weather strip 20 having a molding part 22 raised in a direction along the vertical direction and perpendicular to the extrusion molding part 21 is attached. The mold forming part 22 may be made of solid or sponge.
Further, the mold forming portion 22 of the door weather strip 20 is elastically contacted across the main seal 10 from the vehicle outer surface of the upper left and right side of the lower door 3 at the upper portion of the lower door 3 where the lower door 3 does not exist. . That is, as shown in FIG. 2, at the position where the lower door 3 is present, the lower end portion of the mold forming portion 22 that extends in the vertical direction when the upper door 2 is closed is elastically projected on the vehicle outer surface of the left and right upper end portions of the lower door 3. In contact with the lower door 3 where the lower door 3 does not exist, the upper part of the lower portion of the molded portion 22 that is elastically contacted with the lower door 3 is directly elastically contacted with the main seal 10. At this time, since the lower door 3 has a plate thickness, a gap G is formed in the upper portion of the lower door 3.

  As shown in FIG. 3, the first seal lip portion 13 protrudes substantially horizontally from the vehicle outer surface of the mounting base portion 12 of the main seal 10 toward the outside of the vehicle, and as shown in FIG. 4, the door weather strip 20 A second seal lip portion 23 is projected substantially vertically from the mold forming portion 22 so that its tip portion elastically contacts the tip portion of the first seal lip portion 13.

  In the back door seal structure in the present embodiment, the first seal lip portion 13 and the second seal lip portion 23 block the intrusion of water W such as rain water or car wash water, and the water W forms the door weather strip 20. The gap G formed between the portion 22 and the hollow seal portion 11 of the main seal 10 is prevented from reaching. Thereby, it is possible to prevent the water W from entering the vehicle through the gap G.

  In this embodiment, the second seal lip portion 23 protrudes from the upper end to the lower end of the mold forming portion 22, and the first seal lip portion 13 protrudes from the main seal 10 at a position corresponding to the elastic contact. If the first seal lip portion 13 and the second seal lip portion 23 are provided so as to protrude at least at a position above the lower door 3 where the lower door 3 does not exist, that is, at a position where the gap G is formed, the water W is generated. Intrusion into the vehicle through the gap G can be prevented in advance.

Moreover, in this embodiment, since the 1st seal lip part 13 is protrudingly provided from the highly rigid attachment base 12 which embedded the core material 15, the attitude | position can be kept stable.
Therefore, the tip end portion of the first seal lip portion 13 can be firmly elastically contacted with the second seal lip portion 23 to reliably prevent water from reaching the gap.

  It should be noted that by making one or both of the portions where both the first seal lip portion 13 and the second seal lip portion 23 are elastically contacted with each other, the elastic contact between the both is made more watertight and the intrusion of the water W is prevented. Furthermore, it can prevent reliably.

  Further, in the present embodiment, the first seal lip portion 13 and the second seal lip portion 23 are elastically contacted with each other at their tip ends, but the present invention is not limited to such a configuration, for example, one tip portion. Can be elastically contacted with the other intermediate portion. Also in this case, similarly, the water W can be prevented from reaching the gap G and can be prevented from entering the vehicle.

(Second embodiment)
Next, with reference to FIG. 5, the back door seal structure which concerns on 2nd embodiment of this invention is demonstrated. FIG. 5 is a cross-sectional view showing a back door seal structure.
This back door seal structure is characterized in that a seal lip 14 having a substantially L-shaped cross section with its tip portion elastically contacting the mold forming portion 22 is projected from the vehicle outer surface of the mounting base portion 12 of the main seal 10.

  Accordingly, the seal lip 14 can reliably prevent the water W from reaching the gap G between the mold forming portion 22 and the main seal 10, and the water W can enter the vehicle through the gap G. Can be blocked.

Further, since the seal lip 14 protrudes from the highly rigid mounting base 12, the posture can be stably maintained.
Therefore, the front end portion can be firmly elastically contacted with the mold forming portion 22 of the door weather strip 20 to reliably prevent the water W from entering.

  The seal lip 14 is made of sponge rubber at its tip, so that the seal lip 14 can be further elastically contacted with the mold forming portion 22 to prevent water W from entering.

(Third embodiment)
Next, with reference to FIG. 6, the back door seal structure which concerns on 3rd embodiment of this invention is demonstrated. FIG. 6 is a cross-sectional view showing a back door seal structure.
This back door seal structure is characterized in that a seal lip 24 having a substantially L-shaped section protruding from the mold forming portion 22 of the door weather strip 20 and having a distal end elastically contacting the outer surface of the mounting base 12 of the main seal 10 is provided. Yes.

  Also in this back door seal structure, the function of the seal lip 24 prevents the water W from reaching the gap G formed between the mold forming portion 22 of the door weather strip 20 and the hollow seal portion 11 of the main seal 10. Thus, it is possible to prevent intrusion from the gap G into the vehicle.

  The tip of the seal lip 24 is made of sponge rubber, so that the water W can be elastically contacted with the mounting base 12 of the main seal 10 to prevent water W from entering more reliably.

(Fourth embodiment)
Next, with reference to FIG. 18, FIG. 19, the back door seal structure which concerns on 4th embodiment of this invention is demonstrated. 18 and 19 are cross-sectional views showing a back door seal structure.
This back door seal structure is characterized in that seal lips 25 and 26 having a generally tongue-shaped cross section whose tip ends are elastically contacted with the body 1 from the molded portion 22 of the door weatherstrip 20.
As shown in FIG. 18, the seal lip 25 protrudes from the surface of the molded part 22 on the main seal 10 side, and elastically contacts the surface of the body 1 slightly outside the flange F to which the main seal 10 is attached. As shown in FIG. 19, the seal lip 26 protrudes from the outer surface of the molded part 22, and when the upper door 2 is closed, the outer surface of the molded part 22 faces the surface of the body 1. It is in elastic contact with (the surface of the body 1 extending substantially parallel to the flange F). Note that the seal lip 25 and the seal lip 26 may be provided side by side.

  In this back door seal structure, the water W reaches the gap G formed between the mold forming portion 22 of the door weather strip 20 and the hollow seal portion 11 of the main seal 10 due to the action of the seal lips 25 and 26. Is prevented at the position in front of the main seal 10 (outside the vehicle), so that the water W can be prevented from entering the vehicle through the gap G.

  In addition, by making the tip portions of the seal lips 25, 26 from sponge rubber, the body 1 can be elastically contacted with the body 1 to prevent water W from entering more reliably.

  In the back door seal structure according to each of the above-described embodiments, in addition to the back door having the configuration shown in FIG. 7, the upper door 2 is vertically rotatable as shown in FIG. The present invention can also be applied to a back door configured to open and close.

The back door seal structure which concerns on 1st embodiment of this invention is shown, and is sectional drawing equivalent to the AA line of FIG. The back door seal structure which concerns on 1st embodiment of this invention is shown, and is sectional drawing equivalent to the BB line of FIG. It is sectional drawing which shows the main seal in FIG. It is sectional drawing which shows the shaping | molding part of the door weather strip in FIG. It is sectional drawing which shows the back door seal structure which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the back door seal structure which concerns on 3rd embodiment of this invention. It is a perspective view which shows the motor vehicle provided with the back door. It is a front view which shows the positional relationship of a main seal and a door weather strip. It is a principal part perspective view which shows the door weather strip attached to the upper door. FIG. 3 is a perspective view of a main part as seen from the main seal side, showing a state in which a molded part of the door weather strip is elastically contacted from the lower door to the main seal. It shows the back door seal structure which concerns on a prior art example, and is the BB sectional drawing of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a principal part expanded sectional view of FIG. It shows the back door seal structure which concerns on a prior art example, and is the sectional view on the AA line of FIG. It is sectional drawing which shows another prior art example. It is a perspective view which shows the motor vehicle provided with the back door of another structure. It is sectional drawing which shows the back door seal structure which concerns on 4th embodiment of this invention. It is sectional drawing which shows another back door seal structure which concerns on 4th embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body 1a Door opening part 2 Upper door 3 Lower door 10 Main seal 11 Hollow seal part 12 Mounting base 13 First seal lip part 14 Seal lip 15 Core material 20 Door weather strip 21 Extrusion part 22 Molding part 23 Second seal Lip part 24 Seal lip 25 Seal lip 26 Seal lip 30 Main seal 31 Hollow seal part 32 Mounting base part 35 Core 40 Door weather strip 41 Extrusion part 42 Molding part 50 Weather strip 51 Hollow seal part 52 Secondary seal 60 Door glass F Flange G Gap W Water

Claims (4)

Each of them has an upper door and a lower door that open and close independently, closes the upper door after closing the lower door, and overlaps the lower end of the upper door with the upper end of the lower door.
A main seal having an attachment base formed integrally with a hollow seal portion elastically contacting the inner peripheral end surfaces of the upper door and the lower door is attached to the periphery of the door opening of the body provided with the back door,
On the inner side of the lower end of the upper door, a horizontally extending extruded portion that elastically contacts the outer surface of the upper end of the lower door, and in the direction along the surface of the upper door at both the left and right ends of the extruded portion, is also extruded. A door weatherstrip having a molded part raised in a vertical direction with respect to the molded part is attached, and further, the molded part is moved from the vehicle outer surface of the left and right upper ends of the lower door to the bottom where no lower door exists. In the position of the upper part of the door, it is a seal structure that elastically contacts over the main seal,
At least at the position of the upper portion of the lower door where the lower door does not exist, a first seal lip portion protrudes from the vehicle outer surface of the mounting base portion of the main seal toward the outside of the vehicle, and the first seal lip portion protrudes from the mold portion of the door weather strip. A back door seal structure characterized in that a second seal lip portion is provided in elastic contact with the one seal lip portion. Each of them has an upper door and a lower door that open and close independently, closes the upper door after closing the lower door, and overlaps the lower end of the upper door with the upper end of the lower door.
A main seal having an attachment base formed integrally with a hollow seal portion elastically contacting the inner peripheral end surfaces of the upper door and the lower door is attached to the periphery of the door opening of the body provided with the back door,
On the inner side of the lower end of the upper door, a horizontally extending extruded portion that elastically contacts the outer surface of the upper end of the lower door, and in the direction along the surface of the upper door at both the left and right ends of the extruded portion, is also extruded. A door weatherstrip having a molded part raised in a vertical direction with respect to the molded part is attached, and further, the molded part is moved from the vehicle outer surface of the left and right upper ends of the lower door to the bottom where no lower door exists. In the position of the upper part of the door, it is a seal structure that elastically contacts over the main seal,
At least at the position of the upper part of the lower door where the lower door does not exist, a seal lip having a substantially L-shaped cross section is projected from the vehicle outer side surface of the mounting base of the main seal so that the tip part elastically contacts the molded part. Characteristic back door seal structure. Each of them has an upper door and a lower door that open and close independently, closes the upper door after closing the lower door, and overlaps the lower end of the upper door with the upper end of the lower door.
A main seal having an attachment base formed integrally with a hollow seal portion elastically contacting the inner peripheral end surfaces of the upper door and the lower door is attached to the periphery of the door opening of the body provided with the back door,
On the inner side of the lower end of the upper door, a horizontally extending extruded portion that elastically contacts the outer surface of the upper end of the lower door, and in the direction along the surface of the upper door at both the left and right ends of the extruded portion, is also extruded. A door weatherstrip having a molded part raised in a vertical direction with respect to the molded part is attached, and further, the molded part is moved from the vehicle outer surface of the left and right upper ends of the lower door to the bottom where no lower door exists. In the position of the upper part of the door, it is a seal structure that elastically contacts over the main seal,
At least at the position of the upper portion of the lower door where the lower door does not exist, a seal lip having a substantially L-shaped cross section protruding from the mold forming portion so that the tip portion elastically contacts the vehicle outer surface of the mounting base portion of the main seal is provided. Characteristic back door seal structure. Each of them has an upper door and a lower door that open and close independently, closes the upper door after closing the lower door, and overlaps the lower end of the upper door with the upper end of the lower door.
A main seal having an attachment base formed integrally with a hollow seal portion elastically contacting the inner peripheral end surfaces of the upper door and the lower door is attached to the periphery of the door opening of the body provided with the back door,
On the inner side of the lower end of the upper door, a horizontally extending extruded portion that elastically contacts the outer surface of the upper end of the lower door, and in the direction along the surface of the upper door at both the left and right ends of the extruded portion, is also extruded. A door weatherstrip having a molded part raised in a vertical direction with respect to the molded part is attached, and further, the molded part is moved from the vehicle outer surface of the left and right upper ends of the lower door to the bottom where no lower door exists. In the position of the upper part of the door, it is a seal structure that elastically contacts over the main seal,
At least at the position of the upper part of the lower door where the lower door does not exist, a back door seal structure characterized in that a seal lip whose tip part elastically contacts the body protrudes from the mold forming part.

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