JP2016060308A - Seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure that can achieve reduction of manufacturing costs.SOLUTION: A seal structure S is adopted for a vehicle. In the vehicle, a thickness part 100 of a flange 11 is formed by a first panel 15, a thick part 200 of the flange 11 is formed of second and third panels 16 and 17, and a thick part 300 of the flange 11 is formed of fourth and fifth panels 18 and 19. In the thick part 100 is formed a bent part 21, and in the thick part 300 is formed a bent part 23. Therefore, the seal structure S allows respective lips 33-36 of a weather strip 13 to hold the thick parts 100 and 300, in an insertion port 27a, with the same holding force as force by which the thick part 200 is held.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a seal structure.

  For example, a seal structure for preventing rainwater or the like from entering the vehicle through the opening is provided at a location where an opening is provided, such as around a vehicle door. Such a seal structure is disclosed in Patent Document 1, for example. This sealing structure includes a panel formed with a flange and a weather strip. The flange has a shape that goes around the opening.

  The weatherstrip is attached to the flange and seals between the panel and the door by a door that closes the opening. The weather strip has a main body portion, a seal portion, two first lips, and two second lips. The main body is formed with an insertion port for inserting a flange. The seal part protrudes from the main body part toward the door. Each first lip and each second lip are both formed in the insertion port and hold a flange in the insertion port. More specifically, each first lip projects from one side to the other side in the thickness direction of the flange with respect to the flange in the insertion port from the main body portion. Each second lip protrudes from the main body portion toward the other side in the thickness direction of the flange with respect to the flange in the insertion port.

  By the way, a vehicle etc. employ | adopt several panel from which board | plate thickness differs from a viewpoint of ensuring intensity | strength. In addition, the flange can be formed not only by a single panel but also by a plurality of panels. As a result, the flange has a plurality of thickness portions having different thicknesses. For this reason, in such a seal structure, the thickness portion that becomes the reference thickness is determined among the thickness portions of the flange, and the first lip and the second lip can be held with a predetermined holding force. It is common to employ a set weather strip.

  However, in this case, when the weather strip is thinner than the reference thickness of the flange, the first lip and the second lip cannot hold the thickness portion in the insertion port with the holding force. For this reason, the weather strip is easy to come off in such a thick portion.

  In this regard, the seal structure of Patent Document 1 includes a plurality of types of spacers that can adjust the thickness of each thickness portion of the flange. In this seal structure, by appropriately selecting a spacer, the holding force of each first lip and each second lip with respect to the thickness portion thinner than the reference thickness can be made equal to the holding force with respect to the thickness portion with the reference thickness. It has become. Thus, in this seal structure, it is possible to stably attach the weather strip to the flange having a plurality of thickness portions.

Japanese Patent Laid-Open No. 10-258691

  However, the conventional seal structure requires a plurality of types of spacers separately. For this reason, the manufacturing cost of this seal structure increases, and as a result, the manufacturing cost of a vehicle or the like employing this seal structure increases.

  The present invention has been made in view of the above-described conventional situation, and is capable of stably attaching a weather strip to a flange having a plurality of thickness portions while realizing a reduction in manufacturing cost. Providing is an issue to be solved.

The seal structure of the present invention includes a panel having a flange that circulates around an opening, and a weather strip that is attached to the flange and seals between the panel and the counterpart material by a counterpart material that closes the opening. In the seal structure provided,
The weather strip includes a main body portion in which an insertion port for inserting the flange is formed, a seal portion protruding from the main body portion toward the mating member, and the flange in the insertion port from the main body portion. A plurality of first lips projecting from one side in the thickness direction of the flange toward the other side, and projecting from the main body part toward the one side from the other side with respect to the flange in the insertion port, together with the first lips A plurality of second lips for holding the flange in the insertion port;
The flange has a first thickness portion whose thickness is a reference thickness and a second thickness portion whose thickness is thinner than the reference thickness,
Each of the first lips and each of the second lips is set to be able to hold the first thickness portion in the insertion port with a predetermined holding force,
At the same position in the circumferential direction of the second thickness portion, there is provided a step in which the first lip and the second lip hold the second thickness portion with the holding force in the insertion port,
The step is formed by bending the panel forming the second flange in the thickness direction.

  In the seal structure of the present invention, the flange has a first thickness portion having a reference thickness and a second thickness portion having a thickness smaller than the reference thickness. Further, in this seal structure, each first lip and each second lip of the weather strip is set so that the first thickness portion can be held in the insertion opening with a predetermined holding force. For this reason, the weather strip attached to the first thickness portion of the flange is stable.

  In this seal structure, since the second thickness portion is provided with a step at the same position in the circumferential direction, the second thickness portion is deformed in the thickness direction by this step. Thereby, in this seal structure, each first lip and each second lip of the weather strip can hold the second thickness portion with the same holding force as the first thickness portion in the insertion port. For this reason, in this seal structure, although it is a single weather strip, the weather strip can be stably mounted not only on the first thickness portion but also on the second thickness portion.

  Here, in this seal structure, the step is formed by bending the panel forming the second thickness portion in the thickness direction. For this reason, in this seal structure, a member such as a spacer is separately prepared for holding the second thickness portion with the same holding force as the first thickness portion for each first lip and each second lip of the weather strip. There is no need.

  Therefore, according to the seal structure of the present invention, it is possible to stably attach the weather strip to the flange having a plurality of thickness portions while realizing a reduction in manufacturing cost.

  In the seal structure of the present invention, the reference thickness may be the maximum thickness of the flange or an intermediate thickness. That is, the flange may have a thicker portion than the reference thickness. In this case, for the thickness portion thicker than the reference thickness, a little extra force is required for attaching the weather strip. However, for this, the workability may be prevented from being impaired by setting the reference thickness. .

  Furthermore, the flange may have a plurality of second thickness portions having different thicknesses. In this case, the shape of the step can be appropriately designed according to the individual thickness of each second thickness portion.

  In particular, the step is preferably formed of a bent portion formed between the proximal end side and the distal end side of the second thickness portion. In this case, a step can be easily formed with respect to the panel forming the second thickness portion.

  For example, a plurality of steps may be formed with respect to the second thickness portion. In this case, each level | step difference can be arrange | positioned with a predetermined pitch with respect to a 2nd thickness part. As described above, when a plurality of steps are formed with respect to the second thickness portion, there are a portion where the step is formed and a portion where the step is not formed in the second thickness portion.

  In particular, the step is preferably formed throughout the second thickness portion. In this case, each first lip and each second lip can hold the entire area of the second thickness portion with the same holding force as that of the first thickness portion. For this reason, a weather strip can be more stably attached to the second thickness portion.

  When the second thickness part is formed by a single panel, the effect of the present invention is great. For this reason, according to this seal structure, it becomes possible to relax the restriction on the design of the flange, the restriction on the thickness of the panel, and the like. For this reason, according to this seal structure, the freedom degree of design of a vehicle etc. can be made high.

  Further, the second thickness portion may be formed by a plurality of panels. And the level | step difference is sufficient if at least 1 sheet | seat of each panel which forms a 2nd thickness part is bent and formed in the thickness direction.

  If the plate thickness of each panel is thin, even if it is a case of a plurality of panels, it can be the second thickness portion. In this case, for example, it is possible to provide a step by bending all the panels forming the second thickness portion. On the other hand, when forming a step by bending at least one of the panels to be formed, the step can be easily formed with respect to the second thickness portion.

  According to the seal structure of the present invention, it is possible to stably attach a weather strip to a flange having a plurality of thickness portions while realizing a reduction in manufacturing cost.

It is a perspective view from the upper part which shows the rear part of the vehicle of an Example. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view showing a panel and a flange according to an example vehicle. FIG. (A) is a top view showing a panel and a flange. FIG. (B) is a partially enlarged perspective view from the left front side showing the panel and the flange. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. FIG. (A) is a cross-sectional view showing a second thickness portion of the flange. FIG. (B) is a cross-sectional view showing a state in which a weather strip is attached to the second thickness portion shown in FIG. (A). FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. (A) is a cross-sectional view showing a first thickness portion of the flange. FIG. (B) is a cross-sectional view showing a state in which a weather strip is attached to the first thickness portion shown in FIG. (A). FIG. 5 is a cross-sectional view taken from the direction VV in FIG. FIG. (A) is a cross-sectional view showing a second thickness portion of the flange. FIG. (B) is a cross-sectional view showing a state in which a weather strip is attached to the second thickness portion shown in FIG. (A). It is an expanded sectional view concerning a vehicle of an example and showing a weatherstrip. It is sectional drawing which shows the state which concerns on the vehicle of an Example and with which the weather strip was mounted | worn with respect to the 2nd thickness part in which the bending part is not formed.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the vehicle according to the embodiment includes a vehicle body 1 and a back door 3. A substantially rectangular rear gate 5 that communicates the outside of the vehicle and the interior of the passenger compartment CR is formed at the rear of the vehicle body 1. In this vehicle, the seal structure S of the present invention is adopted around the rear gate 5. This rear gate 5 corresponds to the opening in the present invention.

  The back door 3 is swingably attached to the rear portion of the vehicle body 1 via hinges 7a and 7b and telescopic rod dampers 9a and 9b, and the rear gate 5 can be closed and opened. This back door 3 corresponds to the counterpart material in the present invention.

  As shown in FIG. 2, the vehicle body 1 is provided with a flange 11 that goes around the rear gate 5 along the rear gate 5. A weather strip 13 is attached to the flange 11 as shown in FIG. Thus, the weather strip 13 surrounds the rear gate 5.

  The flange 11 includes the first panel 15 shown in FIG. 3A, the second and third panels 16 and 17 shown in FIG. 4A, and the fourth and fifth panels 18 shown in FIG. , 19 etc. The flange 11 is formed by pressing the first to fifth panels 15 to 19 and the like, and circulates around the rear gate 5 in the vehicle body 1 as shown in FIG.

  The first panel 15 shown in FIG. 3A and the second and third panels 16 and 17 shown in FIG. 4A each have a plate thickness X1. On the other hand, the fourth and fifth panels 18 and 19 shown in FIG. 5A have a plate thickness X2, and the fourth and fifth panels 18 and 19 are more than the first to third panels 15 to 17. It is getting thinner. As shown in FIG. 4A, the second panel 16 and the third panel 17 are joined to each other by spot welding. Similarly, the fourth panel 18 and the fifth panel 19 shown in FIG. 5A are also joined to each other by spot welding.

  As a result, the flange 11 has a plurality of thickness portions 100, 200, and 300 having different thicknesses. Specifically, as shown in FIG. 3A, the thickness portion 100 is formed only by the first panel 15. As shown in FIG. 4A, the thickness portion 200 is formed by the second panel 16 and the third panel 17. As shown in FIG. 5A, the thickness portion 300 is formed by the fourth panel 18 and the fifth panel 19.

  The thickness of the thick portion 200 shown in FIG. 4A is the sum of the plate thickness X1 of the second panel 16 and the plate thickness X1 of the third panel 17. And in this seal structure S, the thickness of the thickness part 200 is set to the reference thickness T1. Thereby, the thickness part 200 is equivalent to the 1st thickness part in this invention. On the other hand, the thickness T <b> 2 of the thick portion 100 shown in FIG. 3A is equal to the plate thickness X <b> 1 of the first panel 15. 5A is the sum of the thickness X2 of the fourth panel 18 and the thickness X2 of the fifth panel 19. The thickness T3 of the thickness portion 300 shown in FIG. That is, both the thickness part 100 and the thickness part 300 are thinner than the thickness part 200. Thereby, both the thickness part 100 and the thickness part 300 are equivalent to the 2nd thickness part in this invention. In addition, when the thickness T2 of the thickness part 100 and the thickness T3 of the thickness part 300 are compared, the thickness T3 of the thickness part 300 is thicker.

  As shown in FIG. 3A, a bent portion 21 that bends the thickness portion 100 in the thickness direction is formed between the proximal end 100a side and the distal end 100b side of the thickness portion 100. The bent portion 21 is formed by pressing the first panel 15. Thereby, as shown to (B) of FIG. 2, the bending part 21 is formed in the whole region of the thickness part 100 in the same position of the circumferential direction of the thickness part 100. FIG. And as shown to (A) of FIG. 3, the level | step difference is provided in the thickness part 100 by this bending part 21, and the position by the side of the base end 10a and the position by the side of the front-end | tip 100b differ. . More specifically, as shown in FIG. 2B, in the thick portion 100, the distal end 100b side is located farther from the rear gate 5 than the proximal end 100a side. Then, the thickness portion 100 is bent in the thickness direction by the bending portion 21 as described above, so that the thickness of the thickness portion 100 is equal to the plate thickness X1 of the first panel 15 as shown in FIG. The thickness T4 is larger than the thickness T2.

  As shown in FIG. 5A, between the proximal end 300a side and the distal end 300b side of the thick portion 300, a bent portion 23 that bends the thick portion 300 in the thickness direction is formed. The bent portion 23 is formed by pressing only the fourth panel 18. Thereby, similarly to the bending part 21 in said thickness part 100, the bending part 23 is formed in the whole area of the thickness part 300 in the same position of the circumferential direction of the thickness part 300. FIG. The bent portion 23 also forms a step in the thickness portion 300, and the position on the base end 300a side and the position on the distal end 300b side are different. Thereby, in the thickness part 300, the front-end | tip 300b side is located far from the rear gate 5 rather than the base end 300a side. As described above, the thickness portion 300 is bent in the thickness direction by the bent portion 23, so that the thickness of the thickness portion 300 is equal to the plate thickness X2 of the fourth panel 18 and the plate thickness X2 of the fifth panel 19. The thickness T4 is larger than the summed thickness T3.

  Here, in this seal structure S, the shape of the bent portion 21 and the shape of the bent portion 23 are adjusted so that both the thickness portion 100 and the thickness portion 300 become the thickness T4. Further, as shown in FIG. 4A, the bent portions 21 and 23 are not formed in the thickness portion 200. For this reason, the thickness part 200 is flat, and the position on the base end 200a side and the position on the tip end 200b side are located on a straight line.

  As shown in FIG. 6, the weather strip 13 includes a main body portion 27, first to third seal portions 29 to 31, and lips 33 to 36. The main body 27 is formed with an insertion port 27a into which the flange 11 can be inserted. As a result, the main body 27 is present, and the cross section in the front-rear direction is substantially U-shaped. The main body 27 is made of solid rubber. On the other hand, the first to third seal portions and the lip 33 are made of ethylene propylene rubber (EPDM). Further, a metal mandrel 37 having a substantially U-shaped cross section in the front-rear direction is embedded in the main body 27.

  The 1st seal | sticker part 29 is provided in the one end side of the main-body part 27, and protrudes toward the back door 3 shown in FIG. As shown in FIG. 6, the first seal portion 29 is formed in a hollow, substantially cylindrical shape, and can be elastically deformed so as to be compressed in the front-rear direction by contacting the back door 3. ing. The first seal portion 29 corresponds to the seal portion in the present invention.

  The second seal portion 30 and the third seal portion 31 are each provided on the other end side of the main body portion 27. The second seal portion 30 and the third seal portion 31 are formed when the weather strip 13 is attached to the flange 11, as shown in FIGS. 3B, 4B, and 5B, respectively. In contact with the first, second and fourth panels 15, 16, 18 and the like. Thereby, the 2nd seal part 30 and the 3rd seal part 31 are elastically deformed so that the inside of insertion slot 27a may be sealed, respectively. In addition, each shape of the 1st-3rd seal | sticker parts 29-30 can be suitably designed according to the shape of the 1st-5 panels 15-19 etc., the shape of the back door 3, etc.

  As shown in FIG. 6, the lip 33 is provided in the main body 27 and is located in the insertion port 27a. On the other hand, the other lips 34 to 36 are formed integrally with the main body 27 and are respectively located in the insertion port 27a. That is, unlike the lip 33, the lips 34 to 36 are made of solid rubber.

  The lip 33 and the lip 35 are respectively located on the other end side in the insertion port 27a. Further, the lip 34 and the lip 36 are respectively located on one end side in the insertion port 27a. The lip 33 and the lip 34 protrude from the one side in the thickness direction of the flange 11 toward the other side in the insertion port 27a. These lip 33 and lip 34 correspond to the first lip in the present invention. Further, the lip 35 and the lip 36 protrude from the other side in the thickness direction of the flange 11 toward one side in the insertion port 27a. These lip 35 and lip 36 correspond to the second lip in the present invention. Thereby, in the weather strip 13, the lip 33 and the lip 35 face each other, and the lip 34 and the lip 36 face each other in the insertion port 27a. 3B, FIG. 4B, and FIG. 5B, the shapes of the lips 33 to 36 are simplified for easy explanation.

  As shown in FIGS. 3B, 4B, and 5B, the weather strip 13 is attached to the flange 11 by inserting each flange 11 into the insertion port 27a. ing. At this time, the main body 27 is suitably deformed along the shape of the flange 11 and consequently the shape of the rear gate 5 by the mandrel 37, and the shape is maintained.

  Further, by contacting the flange 11 inserted into the insertion port 27a, each lip 33 to 36 holds the flange 11 in the insertion port 27a while being elastically deformed individually. Here, the weather strip 13 has the lip 33 to 36 arranged, shapes, and the like so that the thickness portion 200 of the flange 11 can be held in the insertion port 27a with a predetermined holding force.

  Other configurations of the vehicle are the same as those of a known vehicle, and members such as an engine necessary for traveling are attached to the vehicle body 1 shown in FIG. 1 by a known method.

  In the vehicle configured as described above, when the back door 3 closes the rear gate 5, in the weather strip 13 attached to the flange 11, the first seal portion 29 a comes into contact with the back door 3 and elastically deforms. Accordingly, the weather strip 13 seals between the first to fifth panels 15 to 19 and the back door 3. Thus, in this vehicle, rainwater or the like is prevented from entering the passenger compartment CR from the rear gate 5.

  And in the seal structure S which this vehicle employ | adopts, as above-mentioned, each lip 33-36 of the weather strip 13 is set so that the thickness part 200 can be hold | maintained with the predetermined holding force in the insertion port inside 27a. . Therefore, as shown in FIG. 4B, in the thickness portion 200, the elastically deformed lips 33 to 36 can suitably hold the proximal end 200a side and the distal end 200b side, respectively. . Thereby, the weather strip 13 attached to the thickness part 200 of the flange 11 is stabilized.

  Here, for example, when the thickness part 100 is formed flat similarly to the thickness part 200, the thickness of the thickness part 100 becomes the thickness T2 as described above. When the weather strip 13 is attached to the thick portion 100 in this case, as shown in FIG. 7, in the weather strip 13, the lip 35 contacts the base end 100a side of the thick portion 100 in the insertion port 27a. For reasons such as not contacting, the holding force of each lip 33 to 36 with respect to the thickness portion 100 becomes insufficient. For this reason, in this case, the weather strip 13 is easily detached from the thickness portion 100. The same applies to the case where the thick portion 300 is formed flat.

  In this respect, in the seal structure S, the thickness portion 100 is provided with a step due to the bent portion 21 at the same position in the circumferential direction. For this reason, the thickness part 100 is not flat but is deformed in the thickness direction by a step, resulting in a thickness T4. Thereby, in this seal structure S, each lip 33-36 of the weather strip 13 elastically deformed by the thick part 100 can hold the thick part 100 with the same holding force as the thick part 200 in the insertion port 27a. It has become.

  Similarly, since the thickness portion 300 is also provided with a step due to the bent portion 23 at the same position in the circumferential direction, the thickness portion 300 is also deformed in the thickness direction and has a thickness T4. Thereby, in this seal structure S, each lip 33-36 of the weather strip 13 elastically deformed by the thick part 300 can hold the thick part 300 with the same holding force as the thick part 200 in the insertion port 27a. It has become. For this reason, in this seal structure S, the weather strip 13 can be stably mounted not only on the thickness portion 200 but also on the thickness portion 100 and the thickness portion 300, although it is a single weather strip 13. . Thereby, in the vehicle which employ | adopted this seal structure S, the weather strip 13 becomes difficult to remove | deviate from the thickness part 100 or the thickness part 300 of the flange 11. FIG.

  Here, in this seal structure S, the bent portion 21 is formed by bending the first panel 15 forming the thickness portion 100 in the thickness direction. The bent portion 23 is formed by bending the fourth panel 18 forming the thick portion 300 in the thickness direction. For this reason, in this seal structure S, a member such as a spacer is separately prepared for holding the thick portion 100 and the thick portion 300 with the same holding force as the thick portion 200 for each of the lips 33 to 36 of the weather strip 13. There is no need. Further, by forming the bent portions 21 and 23 in the thick portions 100 and 300, respectively, in this seal structure S, it is not necessary to provide a separate member for the thick portions 100 and 300 to form a step. And since these bending parts 21 and 23 are formed by press work, in this seal structure S, it becomes possible to form a level | step difference with respect to the thickness parts 100 and 300 easily.

  Therefore, in the vehicle of the embodiment that employs the seal structure S, the weather strip 13 is stably mounted on the flange 11 having the plurality of thickness portions 100, 200, and 300 while realizing a reduction in manufacturing cost. Is possible.

  In particular, in the seal structure S, the bent portion 21 and the bent portion 23 are formed over the entire thickness portions 100 and 300, respectively. For this reason, in the seal structure S, each lip 33 to 36 can hold the entire area of the thick portions 100 and 300 with the same holding force as that of the thick portion 200.

  Further, according to this seal structure S, even if the thick portion 100 is formed by the single first panel 15 or the thick portion 300 is formed by the fourth panel 18 and the fifth panel 19, Each of the lips 33 to 36 can hold the thickness portions 100 and 300 with the thickness portion 200 and the holding force. For this reason, in the vehicle which employ | adopted this seal structure S, it is possible to ease the restrictions with respect to the design of the flange 11, the restrictions with respect to the plate thicknesses X1 and X2 of the first to fifth panels 15 to 19, and the like. For this reason, in the vehicle which employ | adopted this seal structure S, the freedom degree of design is high.

  Further, the bent portion 23 in the thick portion 300 is formed only on the fourth panel 18 among the fourth and fifth panels 18 and 19 forming the thick portion 300. For this reason, it is possible to easily form a step with respect to the thickness portion 300.

  While the present invention has been described with reference to the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments and can be appropriately modified and applied without departing from the spirit thereof.

  For example, in the vehicle of the embodiment, the seal structure S of the present invention may be adopted around a door for a driver or the like to enter and exit the passenger compartment CR. Further, when the vehicle has a sunroof, the seal structure S of the present invention may be adopted around the sunroof. When the vehicle has a trunk room, the seal structure S of the present invention may be adopted around the trunk room.

  Further, in the embodiment, the bent portions 21 and 23 are formed so that the thicknesses of the thickness portions 100 and 300 are equal to the thickness T4. However, the present invention is not limited thereto, and the thicknesses of the thickness portions 100 and 300 are the reference values. You may form the bending parts 21 and 23 so that it may become thickness T1. Further, the bent portions 21 and 23 may be formed so that the thickness is different between the thickness portion 100 where the bent portion 21 is formed and the thickness portion 300 where the bent portion 23 is formed.

  Further, the thickness portions 100, 200, and 300 may be formed by three or more panels.

  The weather strip 13 may have three or more lips corresponding to the first lip in the present invention and three or more lips corresponding to the second lip.

  The present invention can be used for buildings as well as vehicles.

3 ... Back door (partner material)
5 ... Rear gate (opening)
DESCRIPTION OF SYMBOLS 11 ... Flange 13 ... Weather strip 15-19 ... 1st-5th panel (panel)
21 ... Flange (second flange)
DESCRIPTION OF SYMBOLS 21 ... Bending part 23 ... Bending part 27 ... Main-body part 27a ... Insertion slot 29 ... 1st seal | sticker part (seal part)
33, 34 ... Lip (first lip)
35, 36 ... Lip (second lip)
100 ... Thickness part (second thickness part)
100a ... Base end 100b ... Tip 200 ... Thick part (first thickness part)
300 ... Thickness part (second thickness part)
300a ... Base end 300b ... Tip S ... Seal structure T1 ... Standard thickness

Claims (5)

In a seal structure comprising a panel formed with a flange that circulates around an opening, and a weather strip that is attached to the flange and seals between the panel and the counterpart material by a counterpart material that closes the opening.
The weather strip includes a main body portion in which an insertion port for inserting the flange is formed, a seal portion protruding from the main body portion toward the mating member, and the flange in the insertion port from the main body portion. A plurality of first lips projecting from one side in the thickness direction of the flange toward the other side, and projecting from the main body part toward the one side from the other side with respect to the flange in the insertion port, together with the first lips A plurality of second lips for holding the flange in the insertion port;
The flange has a first thickness portion whose thickness is a reference thickness and a second thickness portion whose thickness is thinner than the reference thickness,
Each of the first lips and each of the second lips is set to be able to hold the first thickness portion in the insertion port with a predetermined holding force,
At the same position in the circumferential direction of the second thickness portion, there is provided a step in which the first lip and the second lip hold the second thickness portion with the holding force in the insertion port,
The level difference is formed by bending the panel forming the second flange in the thickness direction.   The seal structure according to claim 1, wherein the step includes a bent portion formed between a proximal end side and a distal end side of the second thickness portion.   The seal structure according to claim 1, wherein the step is formed in the entire area of the second thickness portion.   The seal structure according to claim 1, wherein the second thickness portion is formed by a single panel. The second thickness portion is formed by a plurality of the panels,
4. The seal structure according to claim 1, wherein the step is formed by bending at least one of the panels forming the second thickness portion in the thickness direction. 5.

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