JP2012057778A - Fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fastener which enables locking pieces to be effectively locked on a trough part of a screw when an internal thread part is formed on the inner circumferential surface of a mounting hole.SOLUTION: The locking pieces 22 is arranged at constant pitches (1 mm) along an insertion direction to constitute locking-piece lines 26. Four locking-piece lines 26 are provided when viewed from the insertion direction. Moreover, the position of the locking pieces 22 in the insertion direction between locking-piece lines 26 is displaced between the locking-piece lines 26. The locking pieces 22 are arranged to be displaced by 0.25 mm (1/4 of the pitch (1 mm)) in the insertion direction to the locking pieces 22 of adjacent locking-piece lines 26. This structure enables the locking pieces 22 to be effectively locked on the trough part of the screw when the internal thread part 44A is formed on the inner circumferential surface (the internal thread part 44A of a weld nut 44) of a mounting hole 46.

Description

  The present invention relates to a fastener for attaching an attachment member to a member to be attached.

  The fastener of Patent Document 1 is provided with a leg portion that is inserted into the mounting hole of the mounted member. Furthermore, a number of fin-like locking pieces that lock the mounting holes are provided on the peripheral surface of the leg portion.

  With this configuration, when the leg portion of the fastener is inserted into the mounting hole, the locking piece is locked with the hole edge of the mounting hole, thereby preventing the leg portion from being pulled out. The stop state is maintained. For example, when a female screw portion is formed on the inner peripheral surface of the mounting hole, the locked state is maintained by locking the locking piece to the valley portion of the screw.

JP 2005-331067 A

  However, when a female thread portion is formed on the inner peripheral surface of the mounting hole, the thread valley shape of the screw is a spiral. Therefore, the position of the valley of the screw is changed in the circumferential direction of the leg. For this reason, it is conceivable that the locking piece is not locked with the valley of the screw over the circumferential direction of the mounting hole.

  An object of the present invention is to effectively lock a locking piece to a thread valley when a female screw portion is formed on the inner peripheral surface of a mounting hole.

  The fastener according to claim 1 of the present invention includes a support member that is inserted into an attachment hole formed in the member to be attached, and a plurality of base ends that are fixed to the support member and arranged in the insertion direction of the support member. And a leg part provided with a locking piece whose tip part is locked to a female screw part provided in the attachment hole, and provided on one end side of the leg part and attached to the attached member. A plurality of locking piece rows of the locking pieces arranged in the insertion direction are provided around the support member when viewed from the insertion direction. The locking pieces provided in the insertion direction are arranged at a constant pitch in the insertion direction, and the positions of the locking pieces adjacent to each other between the rows are shifted in the insertion direction.

  According to the above configuration, the leg portion of the fastener is formed with a support member inserted into the attachment hole formed in the attached member and a plurality of the support member inserted in the insertion direction, and the tip of the female screw portion provided in the attachment hole. And a locking piece for locking the part. Furthermore, the holding | maintenance part by which the attachment member attached to a to-be-attached member is hold | maintained is provided in the one end side of the leg part.

  Here, a plurality of locking piece rows of locking pieces arranged in the insertion direction are provided around the support member when viewed from the insertion direction, and the locking pieces provided in each row are arranged at a constant pitch. Has been placed. Moreover, the position of the insertion direction of the adjacent locking piece between each row | line | column has shifted | deviated.

  Therefore, the pitch of the locking pieces is set in accordance with the pitch of the female screw portion provided in the mounting hole, and the position of the adjacent locking pieces in the insertion direction is shifted so as to correspond to the helical shape of the female screw portion. Thus, the locking piece can be effectively locked to the valley of the screw.

  The fastener according to claim 2 of the present invention is the fastener according to claim 1, wherein four of the locking piece rows are provided when viewed from the insertion direction, and the insertion of the adjacent locking pieces between the rows is performed. The displacement amount of the direction position is ¼ of the pitch.

  According to the above configuration, the four locking piece rows are provided when viewed from the insertion direction, and the displacement amount of the adjacent locking pieces in the insertion direction between the rows is 1/4 of the pitch. Thereby, the locking piece can be further effectively locked to the valley of the screw.

  The fastener according to claim 3 of the present invention is the fastener according to claim 2, wherein the support member includes a first plate portion and a second plate portion so as to have a cross shape when viewed from the insertion direction, The locking piece has a rectangular shape when viewed from the insertion direction, and a base end portion of the locking piece is attached across the first plate portion and the second plate portion.

  According to the above configuration, the support member has a cross shape when viewed from the insertion direction, and the base end portion of the locking piece is attached across the first plate portion and the second plate portion. Thereby, the rigidity of a locking piece improves and it can suppress that a locking piece detach | leaves from the trough part of a screw.

  The fastener according to a fourth aspect of the present invention is the fastener according to the first aspect, wherein the two locking pieces are provided when viewed from the insertion direction, and the insertion of the adjacent locking pieces between the rows is performed. The displacement amount of the direction position is ½ of the pitch.

  According to the above configuration, two locking piece rows are provided when viewed from the insertion direction, and the displacement amount of the adjacent locking pieces in the insertion direction between the rows is ½ of the pitch. Thereby, the locking piece can be further effectively locked to the valley of the screw.

  The fastener according to claim 5 of the present invention is the fastener according to any one of claims 1 to 4, wherein the urging portion that urges the leg portion inserted in the attachment hole in the direction of removing the leg portion. It is provided.

  According to the above configuration, the urging portion urges the leg portion inserted into the mounting hole in the direction in which the leg portion is removed. Thereby, the attachment attitude | position of a fastener can be stabilized.

  According to the present invention, when the female screw portion is formed on the inner peripheral surface of the mounting hole, the locking piece can be effectively locked to the screw valley.

It is the perspective view which showed the fastener which concerns on 1st Embodiment of this invention. (A) (B) It is the side view and sectional view showing the fastener concerning a 1st embodiment of the present invention. It is the side view which showed the fastener etc. which concern on 1st Embodiment of this invention. It is the side view which showed the fastener etc. which concern on 1st Embodiment of this invention. It is the side view which showed the fastener etc. which concern on 1st Embodiment of this invention. It is drawing which showed the intensity | strength of the fastener which concerns on 1st Embodiment of this invention with the graph. It is the side view which showed the fastener etc. which concern on 2nd Embodiment of this invention. It is the perspective view which showed the fastener which concerns on 3rd Embodiment of this invention. (A) (B) It is the side view and sectional view showing the fastener concerning a 3rd embodiment of the present invention.

  An example of a fastener according to the first embodiment of the present invention will be described with reference to FIGS.

(overall structure)
As shown in FIG. 3, the fastener 10 according to the present embodiment is formed of a resin material, and is inserted into a mounting hole 46 formed in the body panel 40 as a mounted member from the surface of the body panel 40. And a spherical holding part 14 to which an engine cover 42 as an attached member attached to the body panel 40 is fixed while being exposed to the outside in a state where the leg part 12 is inserted into the attachment hole 46. (In this embodiment, a plate-like body panel will be described as an example, but a casting such as a cylinder head may be used).

  Furthermore, a hexagonal hexagonal head 16 is provided on the side of the leg portion 12 of the holding portion 14 via a substantially cylindrical connecting portion 20. The hexagonal head 16 is used for gripping the leg 12 when screwed into the mounting hole 46. Further, on the leg 12 side of the hexagonal head 16, an urging portion 18 that urges the leg 12 inserted into the mounting hole 46 in a direction in which the leg 12 is removed (a direction opposite to the insertion direction). Is provided.

  The urging portion 18 is formed in a sucker shape, and is elastically deformed (elastically deformed in the direction of the arrow shown in FIG. 5) when the leg portion 12 is inserted into the mounting hole 46. The urging force in the removal direction is generated in the leg portion 12 as the portion 18 attempts to return to elasticity.

  As described above, the fastener 10 includes the holding part 14, the connecting part 20, the hexagonal head 16, the biasing part 18, and the leg part 12.

  On the other hand, a rubber grommet 48 in which a spherical concave portion 48 </ b> A into which the spherical holding portion 14 is fitted is provided, and an annular concave portion 48 </ b> B is formed on the outer peripheral surface of the grommet 48. The grommet 48 is fixed to the engine cover 42 by fitting a circular through hole 42A formed in the engine cover 42 into the recess 48B.

  A welding nut 44 is fixed to the back surface of the body panel 40 by welding, and a female thread portion 44A of the welding nut 44 is inserted through the mounting hole 46. In this embodiment, as an example, the welding nut 44 is an M6 welding nut, and the thread pitch of the female thread portion 44A is 1 mm.

  With the above configuration, the recessed portion 48 </ b> A of the grommet 48 fixed to the engine cover 42 is fixed to the holding portion 14 of the fastener 10 in a state where the leg portion 12 of the fastener 10 is inserted into the mounting hole 46 formed in the body panel 40. So that the engine cover 42 can be attached to the body panel 40. The configuration for holding the leg portion 12 of the fastener 10 in the mounting hole 46 formed in the body panel 40 will be described in detail later.

(Main part configuration)
Next, the leg part 12 inserted in the attachment hole 46 is demonstrated.

  As shown in FIGS. 1 and 2, the leg portion 12 is an example of a support member that extends in the insertion direction of the leg portion 12 with respect to the mounting hole 46 (hereinafter simply referred to as the insertion direction (arrow A direction shown in FIG. 2)). A support plate 24 is provided. The support plate 24 includes a first plate portion 24A and a second plate portion 24B orthogonal to the first plate portion 24, and has a cross shape in plan view (see FIG. 2B). And the front-end | tip part (insertion direction edge part) of the support plate 24 is tapered, and the leg part 12 is inserted in the attachment hole 46 now easily.

  Further, in a state where the leg portion 12 is inserted into the mounting hole 46, a plurality of plate-like shapes whose tips are locked to the concave and convex female screw portions 44 </ b> A of the welding nut 44 provided so as to communicate with the mounting hole 46. The locking piece 22 is partitioned by the support plate 24.

  Specifically, the locking piece 22 has a rectangular shape when viewed from the insertion direction (FIG. 2B), and the base end portion (the support plate 24 side) of each locking piece 22 is connected to the first plate portion 24A. It is supported across (attached to) the second plate portion 24B. Further, the locking pieces 22 are arranged at a constant pitch (1 mm in this embodiment) along the insertion direction, and constitute a locking piece row 26. Then, four locking piece rows 26 partitioned by the support plate 24 are provided as viewed from the insertion direction.

  Furthermore, each locking piece 22 is provided so as to be inclined so that the base end portion of each locking piece 22 approaches the distal end portion of the support plate 24 (downward in FIG. 1) with respect to the distal end portion of the locking piece 22. It has been. As a result, when the leg portion 12 is inserted into the mounting hole 46, the distal end portion of the locking piece 22 is elastically deformed while abutting against the screw thread portion of the female screw portion 44A of the welding nut 44, and the thread valley portion. It will return elastic when it reaches. And the front-end | tip part of the latching piece 22 is latched by the uneven | corrugated internal thread part 44A (refer FIG. 5).

  Moreover, the position of the locking piece 22 in the insertion direction between the locking piece rows 26 is shifted between the locking piece rows 26. In this embodiment, the locking pieces 22 are adjacent to the locking piece rows. It is arranged with a displacement of 0.25 mm (1/4 of the pitch (1 mm)) in the insertion direction with respect to the 26 locking pieces 22.

  Specifically, as shown in FIG. 2B, when the position in the insertion direction of the locking piece 22 provided in the locking piece row 26A is considered as a reference, the clock with respect to the locking piece row 26A is watched. The locking piece 22 of the locking piece row 26B provided on the downstream side in the rotation direction (arrow B shown in FIG. 2) is 0. 0 on the insertion side in the insertion direction with respect to the locking piece 22 of the locking piece row 26A. They are offset by 25 mm.

  The locking piece 22 of the locking piece row 26C provided on the downstream side in the clockwise direction with respect to the locking piece row 26B is the insertion side in the insertion direction with respect to the locking piece 22 of the locking piece row 26B. Are displaced by 0.25 mm.

  Further, the locking piece 22 of the locking piece row 26D provided on the downstream side in the clockwise direction with respect to the locking piece row 26C is the insertion side in the insertion direction with respect to the locking piece 22 of the locking piece row 26C. Are displaced by 0.25 mm. Then, considering that the pitch in the insertion direction of the locking pieces 22 provided in each locking piece row 26 is 1 mm, the locking pieces 22 of the locking piece row 26A are locked to the locking pieces row 26D. It can be seen that the piece 22 is arranged 0.25 mm away from the insertion side in the insertion direction.

(Action / Effect)
Next, an operation for attaching the engine cover 42 to the body panel 40 using the fastener 10 will be described.

  First, as shown in FIG. 3, the recess 48 </ b> B of the grommet 48 is fitted into the through hole 42 </ b> A of the engine cover 42, and the grommet 48 is attached to the engine cover 42.

  Next, as shown in FIG. 4, the legs 12 of the fastener 10 are inserted into the mounting holes 46 formed in the body panel 40. Furthermore, the hexagonal head 16 of the fastener 10 is gripped with a tool or the like, and the hexagonal head 16 is rotated to screw the leg portion 12 into the female screw portion 44 </ b> A of the welding nut 44. As a result, the sucker-like urging portion 18 is elastically deformed, and the elastically deformed urging portion 18 attempts to return elastically, so that the urging force in the removal direction (direction opposite to the insertion direction) is applied to the leg portion 12. Arise.

  Here, the locking pieces 22 of the respective locking piece rows 26 provided on the leg portion 12 are arranged at a pitch of 1 mm in the insertion direction, and the locking pieces 22 of the adjacent locking piece rows 26 are arranged. On the other hand, they are arranged with a displacement of 0.25 mm (1/4 of the pitch (1 mm)) in the insertion direction.

  That is, the pitch in the insertion direction of the locking piece 22 of each locking piece row 26 is the same as the pitch of the female screw formed in the female screw portion 44 </ b> A of the welding nut 44.

  Furthermore, the position in the insertion direction of the locking piece 22 of the adjacent locking piece row 26 is also shifted so as to correspond to the spiral shape of the female thread portion 44A of the welding nut 44.

  As a result, the locking pieces 22 of the respective locking piece rows 26 are fitted into the thread valleys formed in the female screw portion 44 </ b> A of the welding nut 44.

  After the fastener 10 is attached to the body panel 40, the holding portion 14 of the fastener 10 is fitted into the recess 48A of the grommet 48, as shown in FIG. Thereby, the engine cover 42 is attached to the body panel 40.

  On the other hand, the horizontal axis in FIG. 6 indicates the rotation angle (°) when the hexagonal head 16 of the fastener 10 is gripped with a tool or the like and the hexagonal head 16 is rotated. The torque generated is shown. From this graph, the fastening piece 10 is arranged on the body panel 40 by arranging the locking pieces 22 so that the locking pieces 22 of the respective locking piece rows 26 fit into the valleys of the threads of the female thread portion 44A of the welding nut 44. It can be seen that the difference between the torque when seated and the torque when the fastener 10 breaks increases.

  As described above, by disposing the locking pieces 22 of each locking piece row 26 at a pitch of 1 mm and shifting the locking pieces 22 of the adjacent locking piece rows 26 by 0.25 mm in the insertion direction, The locking pieces 22 of the respective locking piece rows 26 are fitted into the thread valleys of the female screw portion 44 </ b> A of the welding nut 44. Thereby, when the internal thread portion 44A is formed on the inner peripheral surface of the mounting hole 46 (the internal thread portion 44A of the welding nut 44), the locking piece 22 can be effectively locked to the valley portion of the screw. .

  In addition, by efficiently fitting the locking pieces 22 of the respective locking piece rows 26 into the thread valleys formed in the female screw portion 44A of the welding nut 44, fatigue and deformation generated in the locking pieces 22 can be suppressed. it can.

  Further, as shown in FIG. 6, by increasing the difference between the torque when the fastener 10 is seated and the torque when the fastener 10 is broken, the feeling of moderation is improved, and further, the fastener 10 generated at the time of attachment is improved. Can be prevented from breaking.

  Further, by providing the urging portion 18 and generating an urging force in the removal direction on the leg portion 12, the mounting posture of the fastener 10 can be stabilized.

  In addition, by attaching the base end portion of the locking piece 22 across the first plate portion 24A and the second plate portion 24B, the rigidity of the locking piece 22 is improved, and the locking piece 22 is removed from the valley of the screw. It is possible to suppress the withdrawal.

  Next, an example of a fastener according to the second embodiment of the present invention will be described with reference to FIG. In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 7, the fastener 50 of the second embodiment is provided with a spherical holding portion and is not folded, and a dish-like holding portion 52 is provided at the end of the leg portion 12.

  Specifically, the engine cover 60 is formed with an insertion hole 60A through which the leg portion 12 of the fastener 50 is inserted. When attaching the engine cover 60 to the body panel 40, the leg portion 12 of the fastener 50 is inserted through the insertion hole 60 </ b> A and inserted into the attachment hole 46 of the body panel 40.

  The engine cover 60 is attached to the body panel 40 by pressing the engine cover 60 toward the body panel 40 with the holding portion 52.

  Next, an example of a fastener according to a third embodiment of the present invention will be described with reference to FIGS. In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 8 and 9, the leg portion 72 of the fastener 70 of the third embodiment is provided with a flat support plate 74, and a plurality of base end portions are supported by the support plate 74. The locking piece 76 is provided.

  The locking pieces 76 are arranged at a predetermined pitch (1 mm in this embodiment) along the insertion direction, and constitute a locking piece row 78. Then, two locking piece rows 78 are provided with the support plate 74 interposed therebetween as viewed from the insertion direction (see FIG. 9B).

  Further, the positions of the locking pieces 76 in the insertion direction between the locking piece rows 78 are shifted between the locking piece rows 78, and in this embodiment, the locking pieces 76 are adjacent to the locking piece rows. It is arranged with a deviation of 0.5 mm (1/2 of the pitch (1 mm)) in the insertion direction with respect to the 78 locking pieces 76.

  With the above configuration, when the female screw portion is formed on the inner peripheral surface of the mounting hole, the locking piece 76 can be effectively locked to the screw valley.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It is clear to the contractor. For example, in the above-described embodiment, the case where the number of the locking piece rows is 2 and 4 has been described as an example. However, the present invention is not particularly limited thereto, and the number of the locking piece rows may be 3 or 5 or more. Good.

  Moreover, in the said embodiment, since it demonstrated taking the nut of M6 as an example, although the pitch of the locking piece was 1 mm, you may determine the pitch of a locking piece according to the pitch of the internal thread part of a nut.

  Moreover, in the said embodiment, although the internal thread part 44A was provided in the attachment hole 46 of the body panel 40 by welding the welding nut 44 to the body panel 40, you may provide an internal thread part in an attachment hole by burring etc. .

DESCRIPTION OF SYMBOLS 10 Fastener 12 Leg part 14 Holding | maintenance part 18 Energizing part 22 Locking piece 24 Support plate (support member)
24A First plate portion 24B Second plate portion 26A Locking piece row 26B Locking piece row 26C Locking piece row 26D Locking piece row 40 Body panel (attached member)
42 Engine cover (mounting member)
44A Female thread part 46 Attachment hole 50 Fastener 52 Holding part 60 Engine cover (attachment member)
70 Fastener 72 Leg 74 Support plate (support member)
76 Locking piece 78 Locking row

Claims (5)

A supporting member to be inserted into a mounting hole formed in the mounted member, and a female screw provided in the mounting hole, wherein a plurality of base ends are fixed to the supporting member and aligned in the insertion direction of the supporting member A leg piece provided with a locking piece whose tip is locked to the part,
A holding portion that is provided on one end side of the leg portion and holds an attachment member attached to the attached member;
A plurality of locking piece rows of the locking pieces arranged in the insertion direction are provided around the support member when viewed from the insertion direction,
The fastening pieces provided in each row are arranged at a constant pitch in the insertion direction, and the fasteners in which the positions of the neighboring fastening pieces between the rows are shifted in the insertion direction. The locking piece row is provided four when viewed from the insertion direction,
2. The fastener according to claim 1, wherein a shift amount of a position in the insertion direction between adjacent locking pieces between each row is ¼ of the pitch. The support member includes a first plate portion and a second plate portion so as to have a cross shape when viewed from the insertion direction,
The locking piece is rectangular when viewed from the insertion direction,
The fastener according to claim 2, wherein a base end portion of the locking piece is attached across the first plate portion and the second plate portion. Two locking pieces are provided when viewed from the insertion direction,
The fastener according to claim 1, wherein a shift amount of the position in the insertion direction of the adjacent locking pieces between the rows is ½ of the pitch.   The fastener according to any one of claims 1 to 4, further comprising an urging portion that urges the leg portion inserted into the attachment hole in a direction in which the leg portion is removed.

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