Fixture structure and pin member

Abstract

A clamp structure and a pin member with high shear force are provided. A ring-shaped or cylindrical protrusion (13) centered on an inserted hole (12) of a grommet member (10) protrudes from the periphery of the inserted hole (12) and on the side opposite to the legs (18, 19) relative to the base (11). On the other hand, a pin member (24) is connected to a ring-shaped or cylindrical receiving portion (26) on the extension line of the shaft (25) and between the middle portion (27) of the shaft (25) and the flange portion (35), and has an annular groove portion (41) with the receiving portion (26) as a part. The protrusion (13) is inserted into the groove portion (41) at a position rearward of the base (11), and in the groove portion (41), the side surface of the receiving portion (26) faces the protrusion (13) at a position rearward of the base (11).

Description

Technical Field

[0001] The present invention relates to a clamp structure and a pin member to be mounted on a member. Background Art

[0002] Conventionally, a structure used to attach a bumper to a vehicle body, such as a car, includes a clamp consisting of a grommet and a pin, as described in Patent Document 1 (hereinafter referred to as "the prior art"). In this prior art, a grommet, formed as part of the bumper retainer, has multiple legs inserted into the vehicle body. A hole is formed between the legs, through which the pin is inserted to open the legs. A thin flange is formed on the pin's head, and this prior art achieves a waterproofing function by press-fitting the flange against the grommet.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 5319586 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] However, if the bumper retainer (grommet) moves in a direction deviating from the vehicle body due to the bumper load or external force, a force acts in a direction shearing the pin, tilting the pin and deforming the flange.

[0008] The present invention has been made in view of such actual circumstances and has as its object to provide a clamp structure and a pin member having high shearing force.

[0009] Solutions to Problems

[0010] In order to achieve the above-mentioned purpose, the clamp structure of the present invention is composed of a hole-protecting ring component and a pin component, the hole-protecting ring component is formed with a leg portion inserted into the mounted component on a base portion opposite to the mounted component, and is formed with an insertion hole around which the leg portion is arranged, the pin component has a shaft portion, the shaft portion is inserted into the insertion hole and engages with the leg portion, and is characterized in that the hole-protecting ring component has a protrusion protruding toward the side opposite to the leg portion relative to the base portion, and the pin component has a receiving portion, which contacts the protrusion at a position closer to the protrusion side than the base portion along a direction intersecting the shaft portion (Japanese: when turu).

[0011] The clamp structure of the present invention is characterized in that the shaft portion is connected to the receiving portion, a flange portion is connected to the receiving portion, and the receiving portion and the flange portion form a groove shape into which the protrusion is inserted.

[0012] The fixture structure of the present invention is characterized in that the flange portion has a thin-walled portion that is crimped to the base portion.

[0013] The fixture structure of the present invention is characterized in that the leg portion has a rib that touches the edge of the hole of the mounted member.

[0014] The fixture structure of the present invention is characterized in that the protrusion is formed in a ring shape at the edge of the insertion hole, and the receiving portion is formed in a ring shape on the extension line of the shaft portion.

[0015] The pin member of the present invention engages with a grommet member. The grommet member has a leg portion inserted into the mounted member formed on a base portion opposite to the mounted member, and an insertion hole in which the leg portion is arranged around it. The pin member is characterized by having a shaft portion, a groove portion, a receiving portion, and a thin-walled portion. The shaft portion is inserted into the insertion hole and engages with the leg portion. The groove portion is ring-shaped and sinks (Japanese: 陥没) in the opposite direction to the shaft portion on the extension line of the shaft portion on the side opposite to the leg portion with respect to the base portion, for a part of the grommet member to be inserted. The receiving portion is connected to the extension line of the shaft portion and is a part of the groove portion. The thin-walled portion is connected to the groove portion and is crimped to the base portion.

[0016] Advantages of the Invention

[0017] The grommet member of the fixture structure of the present invention has a protrusion that protrudes from the base portion toward the side opposite to the leg portion. The pin member has a receiving portion that touches the protrusion in a direction crossing the shaft portion at a position closer to the protrusion side than the base portion. Even when a certain force acts on the grommet member in a direction that causes the grommet member to deviate from the mounted member along a direction crossing the shaft portion of the pin member, since there is a protrusion of the grommet member in front of the direction in which the pin member wants to tilt, the receiving portion of the pin member touches the protrusion, so the tilt of the pin member can still be suppressed. That is, it can be said that the shear force of the present invention is relatively high.

[0018] The shaft portion of the fixture structure of the present invention is connected to the receiving portion, and a flange portion is connected to the receiving portion. The receiving portion and the flange portion are formed into a groove shape for the protrusion to be inserted. That is, the protrusion of the grommet member is inserted into the groove-shaped portion of the pin member. In this state, even when a certain force acts in a direction that causes the grommet member to deviate from the mounted member, the tilt of the pin member with the protrusion of the grommet member inserted into the groove-shaped portion can be suppressed. That is, it can be said that the shear force of the present invention is relatively high.

[0019] The flange of the clamp structure of the present invention has a thin-walled portion that is pressed against the base. This prevents the pin member from tilting, preventing the flange from deforming. Furthermore, the flange is pressed against the base of the grommet member while covering the protrusion. Consequently, the present invention achieves watertightness.

[0020] The legs of the clamp structure of the present invention have ribs that contact the edge of the hole in the mounted component. Specifically, the ribs increase the rigidity of the legs, thereby preventing the grommet from deviating. Furthermore, even if a force acts in a direction that would cause the grommet to deviate relative to the mounted component, the ribs of the legs contact the edge of the hole in the mounted component, preventing the grommet from deviating.

[0021] The protrusion of the clamp structure of the present invention is formed in an annular shape at the edge of the insertion hole, and the receiving portion is formed in an annular shape on the extension line of the shaft portion. With this structure, the receiving portion of the pin member and the protrusion of the grommet member touch each other's entire circumference, which is strong and achieves high shear force. In addition, the protrusion is located at the edge of the insertion hole and the receiving portion is located on the shaft portion of the pin member. This can prevent the pin member from tilting compared to a case where the protrusion and receiving portion are formed at positions separate from the insertion hole and the shaft portion. In other words, it can be said that the present invention has a higher shear force.

[0022] The pin member of the present invention comprises a shaft portion, a groove portion, a receiving portion, and a thin-walled portion. The shaft portion is inserted into the insertion hole and engages with the leg portion. The groove portion is annular and, on the side of the base portion opposite the leg portion, is recessed on the side opposite the shaft portion along an extension of the shaft portion to receive a portion of the grommet member. The receiving portion is connected to the extension of the shaft portion and is a portion of the groove portion. The thin-walled portion is connected to the groove portion and is press-fitted to the base portion. Thus, the pin member achieves the same effects as the aforementioned clamp structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a perspective view of the grommet member in the clamp structure according to the embodiment of the present invention as viewed from the side of the inserted hole.

[0024] Figure 2 This is a perspective view of the grommet member in the clamp structure according to the embodiment of the present invention as viewed from the leg side.

[0025] Figure 3 This is a perspective view of the pin member in the clamp structure according to the embodiment of the present invention as viewed from the flange portion side.

[0026] Figure 4 This is a perspective view of a pin member in the clamp structure according to the embodiment of the present invention as viewed from the shaft portion side.

[0027] Figure 5This is a perspective view of the clamp structure according to the embodiment of the present invention as viewed from the side where the pin member is inserted.

[0028] Figure 6 This is a perspective view of the clamp structure according to the embodiment of the present invention as viewed from the side where the pin member is inserted.

[0029] Figure 7 This is a rear view of the side where the pin member is inserted in the clamp structure according to the embodiment of the present invention.

[0030] Figure 8 yes Figure 7 The VIII-VIII section in FIG. 1 is a cross-sectional view of the clamp structure according to the embodiment of the present invention.

[0031] Figure 9 yes Figure 7 The IX-IX section in FIG. 1 is a cross-sectional view of the clamp structure according to the embodiment of the present invention. DETAILED DESCRIPTION

[0032] Hereinafter, a clamp structure according to an embodiment of the present invention will be described with reference to the drawings. Figure 1 as well as Figure 2 1 shows the grommet member 10 constituting the clamp structure 3, Figure 3 as well as Figure 4 The pin member 24 constituting the clamp structure 3 is shown. Figure 5 as well as Figure 6 Indicates fixture structure 3, Figure 7 、 Figure 8 as well as Figure 9 1 and 2 show the appearance and cross-section of the clamp structure 3 when it is mounted on the mounted member 1. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 as well as Figure 6 As shown, the pin member 24 of the clamp structure 3 is mounted on the grommet member 10, as shown in FIG. Figure 7 、 Figure 8 as well as Figure 9 As shown, the clamp structure 3 is mounted on the mounted component 1. For example, the clamp structure 3 is provided on a bumper retainer used when mounting a bumper on the body of an automobile (the automobile, body, bumper, and bumper retainer are not shown). That is, the mounted component 1 is, for example, the body of an automobile, and the grommet member 10 is formed on, for example, the bumper retainer. The bumper is mounted on the bumper retainer, and in this state, the bumper retainer is mounted on the body, thereby mounting the bumper on the body. In addition, this embodiment is a single clamp structure 3, but the number of clamp structures 3 formed on the bumper retainer is arbitrary.

[0033] In the following description, the downstream side of the insertion direction is referred to as the front, the upstream side is referred to as the back, and the directions perpendicular to the insertion direction are referred to as the up and down directions (up, down), the left and the right directions (left side, right side) (see Figure 1 and Figure 3 . ).

[0034] like Figure 1 As shown, the grommet member 10 has a base portion 11 that faces the vehicle body, serving as the mounted member 1. An insertion hole 12 is formed in the base portion 11, into which the pin member 24 is inserted. A protrusion 13 is formed on the rear surface of the base portion 11, surrounding the insertion hole 12. The protrusion 13 is annular or cylindrical, centered on the insertion hole 12, and projects rearward. A wall portion 14 is formed around the rear surface of the base portion 11. The wall portion 14 is annular or cylindrical, coaxial with the protrusion 13, and projects rearward. In other words, the base portion 11 is recessed relative to the height of the wall portion 14. A step portion 15 is formed at the connection between the base portion 11 and the wall portion 14. The step portion 15 is formed in an annular shape along the wall portion 14. A plurality of segments 16 are formed between the protrusion 13 and the step portion 15 in the base portion 11. The segments 16 are formed radially around the protrusion 13 and are arranged at substantially equal intervals in the circumferential direction of the protrusion 13 .

[0035] like Figure 2 As shown, on the lower surface of the base portion 11, a plurality of legs 17 are formed around the inserted hole 12. The legs 17 are roughly plate-shaped and protrude forward. The legs 17 are composed of a first leg 18 and a second leg 19. The first legs 18 are a pair, facing each other on the left and right sides with the inserted hole 12 as the center, and the second legs 19 are a pair, adjacent to the first legs 18, and facing each other on the top and bottom with the inserted hole 12 as the center. The portion of the first leg 18 connected to the base portion 11, i.e., the base 20, has ribs 21 formed on the outer surface. The ribs 21 are formed in two places, and are arranged at the upper and lower ends of the base 20. A raised portion 22 is formed on the inner surface of the second leg 19 (see Figure 8 The distal end of each leg 18, 19 is formed with a locking piece 23 that protrudes toward the inner side that each leg 18, 19 faces. The locking piece 23 of the second leg 19 is connected to the raised portion 22.

[0036] like Figure 3 as well as Figure 4As shown, the pin member 24 includes a shaft portion 25, a receiving portion 26, and a flange portion 35. The shaft portion 25 is inserted into the insertion hole 12 of the grommet member 10. The receiving portion 26 is connected to an extension of the shaft portion 25. The flange portion 35 is connected to the receiving portion 26 and mounted on the base portion 11. The shaft portion 25 is generally hollow cylindrical or columnar. The shaft portion 25 includes an intermediate portion 27 extending forward from the receiving portion 26 and a front end locking portion 28 extending forward from the intermediate portion 27. The front end locking portion 28 includes a front end portion 29, a temporary fixing portion 30 extending rearward from the front end portion 29, and a locking groove portion 34 connected to the rear of the temporary fixing portion 30. The front end portion 29 is a disk-shaped portion smaller than the flange portion 35, with the temporary fixing portion 30 connected at the center. The temporary fixing portion 30 is formed with a temporary fixing groove portion 31, an inclined surface 32 and a partition portion 33. The inclined surface 32 expands toward the side as it goes to the rear, and the partition portion 33 is multiple and protrudes toward the side. The partition portions 33 reach the inclined surface 32 from the front end portion 29 and are arranged at approximately equal intervals in the circumferential direction of the shaft portion 25. Therefore, the temporary fixing groove portion 31 and the inclined surface 32 are divided by the partition portion 33. The fixed groove portion 34 is recessed toward the center of the shaft portion 25 and is divided at the same intervals as the partition portion 33. The middle portion 27 extending from the rear of the fixed groove portion 34 is cylindrical or columnar without bumps, and the receiving portion 26 is annular or cylindrical.

[0037] The flange portion 35 includes a top portion 37, a circular, flat plate; an annular or cylindrical cover portion 39, which protrudes forward from the periphery of the top portion 37; and an annular, thin-walled portion 40, which protrudes outward from the front end of the cover portion 39. An insertion hole 38 is formed on the rear surface of the top portion 37 for inserting a tool (not shown). The receiving portion 26 is connected to the center of the front surface of the top portion 37. The receiving portion 26 is annular or cylindrical, and is arranged facing the inside of the cover portion 39. The receiving portion 26 and the cover portion 39 are concentric circles centered on the shaft portion 25. A groove portion 41, which is a groove, is formed in the space enclosed by the receiving portion 26, the cover portion 39, and the top portion 37. Specifically, the groove portion 41 is an annular portion formed by partially forming the receiving portion 26, and is recessed on the extension line of the shaft portion 25, in the direction opposite to the direction in which the shaft portion 25 extends. The thin-walled portion 40 is thinner than the top portion 37 and the cover portion 39, making it easy to bend. Thin-walled portion 40 is provided with inclined tabs 36 near the connection portion with cover portion 39. These inclined tabs 36 project forward and are inclined along the circumference of thin-walled portion 40. Inclined tabs 36 are formed at two locations, positioned to the side of shaft portion 25. In other words, inclined tabs 36 are located at positions 0 and 180 degrees on the circumference of thin-walled portion 40.

[0038] like Figure 5 as well as Figure 6As shown, the grommet member 10 is combined with the pin member 24. The shaft portion 25 of the pin member 24 is inserted into the insertion hole 12 of the grommet member 10 and engaged with the leg portions 18 and 19 of the grommet member 10.

[0039] Here, the process of engaging the pin member 24 with the grommet member 10 will be described based on the drawings. Figure 7 、 Figure 8 as well as Figure 9 As shown, the legs 18 and 19 of the grommet member 10 are inserted into the mounting hole 2 formed in the mounting member 1. At this point, the rib 21 of the first leg 18 contacts the edge inside the mounting hole 2. In this state, the shaft 25 of the pin member 24 is inserted into the insertion hole 12 of the grommet member 10. The front end 29 of the shaft 25, after passing through the insertion hole 12, contacts the raised portion 22 of the second leg 19, pushing the second leg 19 forward while advancing, causing the second leg 19 to flex and expand outward. The front end 29 of the shaft 25, after passing through the raised portion 22, contacts the locking tab 23 of the first leg 18, pushing the first leg 18 forward while advancing, causing the first leg 18 to flex and expand outward. When the front end portion 29 passes through the locking piece 23, the temporary fixing groove 31 of the shaft portion 25 faces the raised portion 22, causing the second leg portion 19 to return to its original position, with the raised portion 22 positioned in the temporary fixing groove 31. Simultaneously, the first leg portion 18 also returns to its original position. The locking piece 23 is positioned in the temporary fixing groove 31. In this position, the pin member 24 is temporarily fixed to the grommet member 10.

[0040] As the pin member 24 is pushed further in, its inclined surface 32 contacts the raised portion 22, pushing the second leg 19 apart as it advances, causing the second leg 19 to flex and expand outward. The inclined surface 32 rubs against the raised portion 22 and contacts the locking tab 23, pushing the legs 18 and 19 apart as it advances, causing them to flex and expand outward. When the inclined surface 32 passes the locking tab 23, the locked groove 34 faces the locking tab 23, returning the legs 18 and 19 to their original position, with the locking tab 23 positioned in the locked groove 34. In this state, the pin member 24 engages with the grommet member 10.

[0041] In this engaged state, the protrusion 13 of the grommet member 10 is inserted into the groove 41 of the pin member 24. The receiving portion 26 faces the protrusion 13 from the rear of the base portion 11, on the side that intersects the shaft portion 25. The flange portion 35 covers the protrusion 13. Specifically, the receiving portion 26, the covering portion 39, and the top portion 37 cover the protrusion 13. Furthermore, the distal end of the thin-walled portion 40 is pressed against the step 15 of the grommet member 10, causing it to bend, thereby pressurizing the thin-walled portion 40 against the base portion 11, making the rear surface of the base portion 11 watertight. The inclined protrusion 36 of the flange portion 35 is positioned between the segments 16 of the grommet member 10.

[0042] To release the engagement, a tool is inserted into the insertion hole 38 of the pin member 24, and the pin member 24 is rotated by the tool, so that the inclined protrusion 36 of the pin member 24 rides over the segment 16 of the grommet member 10, and the pin member 24 is lifted relative to the grommet member 10. Simultaneously, the shaft portion 25 is separated from the legs 18 and 19.

[0043] Next, the operation and effects of this embodiment will be described.

[0044] In this embodiment, an annular or cylindrical protrusion 13 centered on the insertion hole 12 protrudes from the periphery of the insertion hole 12 of the grommet member 10, on the side opposite the legs 18 and 19 of the base 11. Meanwhile, the pin member 24 has an annular or cylindrical receiving portion 26 extending from the shaft 25, between the intermediate portion 27 of the shaft 25 and the flange 35. The pin member 24 also includes an annular groove 41 forming a portion of the receiving portion 26. With this structure, when the pin member 24 is engaged with the grommet member 10, the protrusion 13 is inserted into the groove 41 at a position rearward of the base 11. Within the groove 41, the side surface of the receiving portion 26 faces the protrusion 13 at a position rearward of the base 11. In other words, the protrusion 13 is located at the periphery of the insertion hole 12, so the insertion hole 12 becomes a cylindrical hole extending backward from the base portion 11 due to the protrusion 13, and the shaft portion 25 and the receiving portion 26 of the pin member 24 are inserted into the cylindrical insertion hole 12.

[0045] A force F is applied from the side in a direction that causes the grommet member 10 to deviate relative to the mounted member 1 (at Figure 8 When a force (in the vertical direction) acts on the grommet member 10, and the pin member 24 is pressed by the inner surface of the insertion hole 12 and just as it is about to tilt, the protrusion 13 extends in front of the direction in which the pin member 24 is about to tilt, and the receiving portion 26 contacts the protrusion 13, thereby suppressing the tilt of the pin member 24. In other words, it can be said that the shear force of this embodiment is relatively high.

[0046] When the pin member 24 is engaged with the grommet member 10, the protrusion 13 of the grommet member 10 is inserted into the groove portion 41, thereby suppressing the pin member 24 from tilting. In other words, the shear force of this embodiment is high.

[0047] In particular, the annular or cylindrical receiving portion 26 and the annular or cylindrical protrusion 13 are in contact with each other over their entire circumferential surfaces, are strong, and achieve a high shear force.

[0048] In this embodiment, the flange portion 35 of the pin member 24 includes a top portion 37, a circular, flat plate connected to the receiving portion 26; an annular or cylindrical covering portion 39 protruding forward from the periphery of the top portion 37; and an annular, thin-walled portion 40 protruding outward from the distal end of the covering portion 39. When the pin member 24 is engaged with the grommet member 10, the flange portion 35 covers the protrusion 13, and the distal end of the thin-walled portion 40 is pressed against the step 15 of the grommet member 10, causing it to bend and press-fit against the base portion 11. This ensures watertightness on the rear surface of the base portion 11. Furthermore, since the pin member 24 is prevented from tilting, the flange portion 35 does not deform, maintaining watertightness.

[0049] In this embodiment, the base 20 of the first leg 18 has ribs 21 formed on its outer surface. Specifically, the ribs 21 increase the rigidity of the first leg 18, thereby preventing the grommet member 10 from deviating. Furthermore, when the legs 18 and 19 of the grommet member 10 are inserted into the mounting hole 2 of the mounted component 1, the ribs 21 contact the edge inside the mounting hole 2. This structure prevents the grommet member 10 from deviating relative to the mounted component 1 due to the contact between the ribs 21 and the edge at the edge of the mounting hole 2. This means that even if a force F acts on the grommet member 10 from the side in a direction that would cause the grommet member 10 to deviate relative to the mounted component 1, the grommet member 10 remains stable due to the contact between the ribs 21 and the edge at the edge of the mounting hole 2. In other words, this embodiment can be said to have a high shear force.

[0050] In other embodiments of the present invention, the rib is formed only at the base of the second leg.

[0051] In other embodiments, ribs are formed at the base of the first leg and the base of the second leg, respectively.

[0052] In other embodiments, the shape, number, and location of the ribs on the base are random.

[0053] In other embodiments, the protrusion is not a continuous ring, but a plurality of protrusions are arranged in a ring.

[0054] In other embodiments, the projection of the grommet member and the receiving portion of the pin member are formed at positions offset to the side from the insertion hole of the grommet member and the shaft portion of the pin member.

[0055] In other embodiments, the pin member does not have a flange portion.

[0056] While the embodiments of the present invention have been described above in detail, the present invention is not limited to the aforementioned embodiments. Furthermore, the present invention is capable of various design modifications as long as they do not depart from the scope of the claims. The present invention is also applicable to vehicles such as automobiles, airplanes, and ships.

[0057] Description of Reference Numerals

[0058] 1. Mounted component; 2. Mounted hole; 3. Clamp structure; 10. Hole guard ring component; 11. Base portion; 12. Inserted hole; 13. Protrusion; 14. Wall portion; 15. Step portion; 16. Segment; 17. Leg portion; 18. First leg portion; 19. Second leg portion; 20. Base portion; 21. Rib; 22. Raised portion; 23. Locking piece; 24. Pin component; 25. Shaft portion; 26. Receiving portion; 27. Intermediate portion; 28. Front end locking portion; 29. Front end portion; 30. Temporary fixing portion; 31. Temporary fixing groove portion; 32. Inclined surface; 33. Partitioning portion; 34. Locked groove portion; 35. Flange portion; 36. Inclined protrusion; 37. Top portion; 38. Inserted hole; 39. Cover portion; 40. Thin-walled portion; 41. Grooved portion; F. Force.

Claims

1. A clamp structure consisting of a grommet member and a pin member, The grommet member is formed with a leg portion to be inserted into the mounted member on a base portion facing the mounted member, and is formed with an insertion hole around which the leg portion is arranged. The pin member has a shaft portion that is inserted into the insertion hole and engages with the leg portion. It is characterized by: The grommet member has a protrusion formed in an annular shape and protruding toward a side opposite to the leg portion at an edge of the insertion hole relative to the base portion. The pin member has: a receiving portion that contacts an inner surface of the protrusion at a position closer to the protrusion than the base portion in a direction intersecting the shaft portion; as well as a flange portion connected to the receiving portion, The shaft portion is connected to the receiving portion, The receiving portion and the flange portion are formed into a groove shape into which the protrusion is inserted.

2. The clamp structure according to claim 1, characterized in that: The flange portion includes a thin-walled portion that is press-contacted with the base portion.

3. The clamp structure according to claim 1 or 2, characterized in that: The leg portion has a rib that contacts an edge of the hole of the mounted member.

4. A pin member engaging with a grommet member, wherein the grommet member has a leg portion formed on a base portion opposite to a mounted member to be inserted into the mounted member, and an insertion hole around which the leg portion is arranged, and the grommet member has a protrusion formed in an annular shape at an edge of the insertion hole relative to the base portion and protruding toward a side opposite to the leg portion. It is characterized by: The pin member has a shaft portion, a groove portion, a receiving portion and a thin-walled portion, The shaft portion is inserted into the insertion hole and engaged with the leg portion. The groove portion is annular and is sunken on the extension line of the shaft portion on the side opposite to the leg portion relative to the base portion to the side opposite to the shaft portion for the protrusion of the grommet member to be inserted. The receiving portion is connected to the extension line of the shaft portion, is a part of the groove portion, and contacts the inner surface of the protrusion in a direction intersecting the shaft portion at a position closer to the protrusion than the base portion. The thin-walled portion is connected to the groove portion and is press-fitted to the base portion.

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