JP2005228582A - Grommet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grommet which is easily mounted on a panel. <P>SOLUTION: The grommet 1 is mounted on a hole of a panel. The grommet 1 is provided with a wide diameter cylindrical part 11 and a plurality of ribs 12. A locking recess part 13 is installed at the other end part 11b of a large diameter side of the wide diameter cylindrical part 11. The locking recess part 13 is locked to the hole 3 of the panel 2. The rib 12 is formed in a convex state from the outer surface 11c of the wide diameter cylindrical part 11. In the outer surface 12a of the rib 12, a cross-sectional shape of a direction crossing an axis core P of the wide diameter cylindrical part 11 is formed in a convex curved line in the outer peripheral direction of the wide diameter cylindrical part 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a grommet that is attached to a panel constituting a vehicle body such as an automobile as a vehicle and that passes a wire harness inside.

  Conventionally, various grommets have been used in order to pass a wire harness through a hole provided in a panel constituting a vehicle body such as an automobile as a vehicle and prevent moisture such as water from adhering to the wire harness. It was. The grommet is provided over the entire circumference of the cylindrical portion, the enlarged cylindrical portion whose inner and outer diameters gradually increase from one end to the other end, and engages with the hole in the panel. It is integrally provided with a locking recess and is made of rubber or the like.

  The above-mentioned grommet is inserted into the hole of the panel from the end on the small diameter side of the enlarged diameter cylindrical portion through the wire harness. After the diameter-expanding cylinder portion is elastically deformed once in the direction of reducing the diameter, the locking recess is locked in the hole and attached to the panel described above. Thus, the conventional grommet has been elastically deformed once in the direction of reducing the diameter of the expanded diameter cylindrical portion and attached to the panel. For this reason, when attaching to the panel, it was necessary to press-fit into the hole with a force stronger than the elastic restoring force of the enlarged diameter cylindrical portion, and it was difficult to attach to the panel.

In order to solve this type of problem, grommets provided with convex ribs from the outer surface of the above-described enlarged diameter cylindrical portion have been used (see, for example, Patent Document 1). The ribs extend linearly along the axis of the enlarged diameter cylindrical portion, and are provided at equal intervals along the circumferential direction of the enlarged diameter cylindrical portion. A step is formed between the rib and the outer surface of the enlarged diameter cylindrical portion. When the grommet provided with the rib described in Patent Document 1 or the like is pressed into the hole, only the rib contacts the panel. For this reason, the grommet provided with the rib has a small contact area with the panel when press-fitted into the hole. Grommets with ribs are easy to attach to the panel by reducing the contact area with the panel.
Japanese Utility Model Publication No. 1-68625

  When the grommet having the rib described above is press-fitted into the hole of the panel, the rib contacts the inner edge of the hole. And if it press-fits in the hole of a panel, a diameter-expanding cylinder part and a rib will elastically deform in the direction which carries out integral diameter reduction (it shows that an inner-outer diameter reduces). Further, a step is provided between the rib and the enlarged diameter cylindrical portion.

  For this reason, when the conventional grommet provided with the rib described above is press-fitted into the hole of the panel, the corner of the rib slides on the inner edge of the hole of the panel, and the corner is caught on the inner edge of the hole of the panel. Sometimes. For this reason, the conventional grommet provided with the above-described rib has a tendency that the locking recess is less likely to be locked in the hole, that is, it is difficult to attach to the panel.

  Accordingly, an object of the present invention is to provide a grommet that can be attached to a panel more easily in a grommet in which ribs are provided to reduce the contact area with the panel.

  In order to solve the problems and achieve the object, the grommet according to the first aspect of the present invention has a cylindrical shape with the inner and outer diameters gradually increasing from the small-diameter end to the large-diameter end. A diameter-enlarged cylinder part formed through which the wire harness is passed, and a locking recess provided at an end part on the large-diameter side of the diameter-enlarged cylinder part, wherein the diameter-enlarged cylinder part is an end part on the small-diameter side In the grommet that is inserted into the hole of the panel from the side, and the locking recess is locked in the hole, a rib protruding from the outer surface of the diameter-expanding cylinder portion is provided, and the diameter-expanding cylinder on the outer surface of the rib The cross-sectional shape in the direction intersecting the axial center of the portion is formed in a curve that is convex in the outer peripheral direction of the enlarged diameter cylindrical portion, and in the direction intersecting the axial center of the enlarged diameter cylindrical portion on the outer surface of the rib Both ends are connected to the outer surface of the enlarged diameter cylindrical portion.

  A grommet according to a second aspect of the present invention is the grommet according to the first aspect, wherein the rib extends along the axis of the diameter-expanded cylindrical portion.

  A grommet according to a third aspect of the present invention is the grommet according to the first or second aspect, wherein a plurality of the ribs are provided, and these ribs are mutually connected along a circumferential direction of the diameter-expanded cylindrical portion. It is characterized by an interval.

  A grommet according to a fourth aspect of the present invention is the grommet according to the third aspect, wherein the ribs are arranged at equal intervals along a circumferential direction of the diameter-enlarging cylindrical portion.

  According to the grommet of the present invention as set forth in claim 1, the cross-sectional shape of the outer surface of the rib is formed in a curve that is convex in the outer peripheral direction of the diameter-enlarged cylindrical portion. Both ends of the rib are connected to the outer surface of the enlarged diameter cylindrical portion. For this reason, when it press-fits in the hole of a panel, the both ends of a rib do not contact the inner edge of the hole of a panel.

  According to the grommet of the present invention described in claim 2, since the rib extends along the axis of the enlarged diameter cylindrical portion, when press-fitting into the hole of the panel along the axis of the enlarged diameter cylindrical portion. The outer surface of the rib can be reliably prevented from being caught by the inner edge of the hole in the panel. Therefore, it is possible to further reduce the friction between the outer surface of the rib and the inner edge of the hole of the panel when press-fitted into the hole of the panel along the axis of the enlarged diameter cylindrical portion.

  According to the grommet of the present invention as set forth in claim 3, the plurality of ribs are provided at intervals along the circumferential direction of the diameter-expanded cylindrical portion. For this reason, when press-fitting into the hole of the panel, only the outer surfaces of the plurality of ribs reliably contact the inner edge of the hole of the panel.

  According to the grommet of the present invention as set forth in claim 4, the plurality of ribs are arranged at equal intervals along the circumferential direction of the diameter-expanded cylindrical portion. For this reason, when press-fitting in the hole of a panel, the hole of a panel and an enlarged diameter cylinder part can be made coaxial.

  As described above, according to the first aspect of the present invention, when press-fitting into the hole of the panel, both ends of the rib do not contact the inner edge of the hole of the panel. For this reason, it can prevent that the both ends of a rib are caught in the inner edge of the hole of a panel, and it can press-fit easily by the hole of a panel, ie, it can attach to a panel more easily.

  According to the second aspect of the present invention, since the rib extends along the axis of the enlarged diameter cylindrical portion, the outer surface of the rib when pressed into the hole of the panel along the axis of the enlarged diameter cylindrical portion And the inner edge of the hole of the panel can be further reduced. Therefore, it can be attached to the panel constituting the vehicle body more easily.

  According to the third aspect of the present invention, only the outer surfaces of the plurality of ribs reliably come into contact with the inner edge of the hole in the panel. For this reason, when it press-fits in the hole of a panel, a contact area with the inner edge of the hole of a panel can be made small reliably. Therefore, it can be easily attached to the panel constituting the vehicle body.

  In the present invention described in claim 4, the plurality of ribs are arranged at equal intervals along the circumferential direction of the diameter-expanded cylindrical portion. For this reason, when press-fitting in the hole of a panel, the hole of a panel and an enlarged diameter cylinder part can be made coaxial. Therefore, when press-fitting into the hole of the panel, the contact pressure with the inner edge of the hole of the panel can be made uniform along the circumferential direction of the diameter-expanded cylindrical portion. Therefore, it can be easily attached to the panel constituting the vehicle body.

  Hereinafter, a grommet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 13. A grommet 1 (shown in FIGS. 1 to 13) according to an embodiment of the present invention has a hole provided in a panel 2 (shown in FIGS. 1 and 7 to 12) constituting a vehicle body such as an automobile as a vehicle. 3 is attached. An annular ring portion 4 is erected from the inner edge of the hole 3 of the panel 2. The ring portion 4 is formed integrally with the panel 2. In the case shown in FIG. 1, the hole 3 has a round planar shape.

  The grommet 1 is formed in a cylindrical shape and passes a wire harness 5 (indicated by a two-dot chain line in FIG. 7) routed inside the automobile. The grommet 1 keeps water tightness between the panel 2 and prevents moisture (liquid) such as water from entering inside from the space between the panel 2, and moisture (liquid) such as water enters the wire harness 5. ) Is prevented.

  The grommet 1 is made of rubber or the like as an elastic material that can be elastically deformed. As shown in FIGS. 1 to 3, the grommet 1 integrally includes a small-diameter cylindrical portion 10 formed in a cylindrical shape, an enlarged-diameter cylindrical portion 11, and a plurality of ribs 12. The small-diameter cylindrical portion 10 is formed in a cylindrical shape, and allows the wire harness 5 (indicated by a two-dot chain line in FIG. 7) to pass inside. The outer diameter of the small diameter cylindrical portion 10 is smaller than the inner diameter of the hole 3. The enlarged diameter cylindrical portion 11 is formed in a cylindrical shape in which the inner and outer diameters gradually increase toward the other end portion 11b as one end portion 11a continues to the small diameter cylindrical portion 10 and moves away from the small diameter cylindrical portion 10. Yes. The enlarged diameter cylindrical portion 11 is arranged coaxially with the small diameter cylindrical portion 10 and is connected to the small diameter cylindrical portion 10 in series.

  In addition, the one end part 11a of the enlarged diameter cylinder part 11 has comprised the edge part by the side of a small diameter, and the other end part 11b has comprised the edge part by the side of a large diameter. Moreover, the enlarged diameter cylinder part 11 lets the wire harness 5 which passes the inside of the small diameter cylinder part 10 pass inside. The outer diameter of the one end portion 11 a of the enlarged diameter cylindrical portion 11 is smaller than the inner diameter of the hole 3, and the outer diameter of the other end portion 11 b of the enlarged diameter cylindrical portion 11 is larger than the inner diameter of the hole 3.

  The other end portion 11b of the enlarged diameter cylindrical portion 11 is provided with a locking recess 13 over the entire circumference. As shown in FIG. 4 and the like, the locking recess 13 is formed to be recessed from the outer surface 11 c of the diameter-expanded cylindrical portion 11. As shown in FIGS. 4 and 5, the locking recess 13 is formed along the first wall 14 near the other end portion 11 b and the axis P (indicated by a one-dot chain line in the drawing) of the enlarged diameter cylindrical portion 11. The second wall 15 near the one end 11a facing the first wall 14 and the groove 16 provided between the first wall 14 and the second wall 15 are formed. A convex lip 17 toward the second wall 15 is provided on the outer edge of the first wall 14 over the entire circumference. The second wall 15 is provided at the above-mentioned other end portion 11 b of the enlarged diameter cylindrical portion 11, and is disposed closer to the one end portion 11 a than the first wall 14. The groove 16 has a lip 18 protruding from the groove bottom surface over the entire circumference.

  The above-described locking recess 13 is inserted into the hole 3 of the panel 2 from the one end portion 11a (that is, the small-diameter cylindrical portion 10) along the arrow K (shown in FIG. 1 and the like) of the enlarged diameter cylindrical portion 11 or the grommet 1. Then, the second wall 15 is once bent toward the inside of the enlarged diameter cylindrical portion 11. Then, the bottom surface of the groove 16 is brought into contact with the inner surface of the hole 3 of the panel 2, and the second wall 15 is returned to the initial state by an elastic restoring force, and is locked in the hole 3 of the panel 2.

  At this time, as shown in FIGS. 7 and 12, the lip 18 is in contact with the hole 3 of the panel 2 and the inner surface of the ring part 4, and keeps watertight between the hole 3 and the inner surface of the ring part 4. . Further, at this time, as shown in FIGS. 7 and 12, the lip 17 is in contact with the outer surface of the panel 2 to keep watertight between the outer surface of the panel 2.

  Further, the direction of inserting the arrow K, that is, the grommet 1 (the enlarged diameter cylindrical portion 11) into the hole 3 of the panel 2 is parallel to the diameter enlarged cylindrical portion 11, that is, the axis P of the grommet 1. That is, the grommet 1 is inserted into the hole 3 of the panel 2 along the diameter-expanded cylindrical portion 11, that is, the axis P of the grommet 1. In addition, the initial state mentioned above has shown the state which the diameter expansion cylinder part 11, ie, the grommet 1, is not elastically deforming.

  As shown in FIGS. 1 to 3 and 6, the rib 12 is convex from the outer surface 11 c of the diameter-expanded cylindrical portion 11 and extends linearly along the axis P. The rib 12 is arranged closer to the one end 11 a than the locking recess 13. The rib 12 is provided from the one end portion 11 a of the enlarged diameter cylindrical portion 11 to the second wall 15. The plurality of ribs 12 are provided at equal intervals along the circumferential direction around the axis P of the diameter-enlarged cylindrical portion 11. That is, the plurality of ribs 12 are spaced from each other along the circumferential direction centering on the axis P of the diameter-enlarging cylindrical portion 11.

  When the plurality of ribs 12 are inserted into the hole 3 of the panel 2 in the diameter-expanded cylindrical portion 11, that is, the grommet 1, the portion between the one end portion 11 a and the other end portion 11 b is the hole of the panel 2 in the initial state. 3 contacts the inner edge.

  As shown in FIG. 6, the outer surface 12 a of the rib 12 is formed in a convex curve in the outer circumferential direction of the diameter-enlarged cylindrical portion 11 in a cross section orthogonal to (crossing) the axis P described above. That is, the outer surface 12 a of the rib 12 is formed in a curved surface that is convex in the outer peripheral direction of the diameter-enlarged cylindrical portion 11. Further, both ends 12b, 12c in a direction orthogonal (crossing) to the axis P of the rib 12 are connected to the outer surface 11c of the enlarged diameter cylindrical portion 11 as shown in FIG. Further, the both ends 12 b and 12 c described above are connected to the outer surface 11 c of the enlarged diameter cylindrical portion 11 over the entire length along the axis P of the rib 12. For this reason, no step is provided between the rib 12 and the enlarged diameter cylindrical portion 11.

  When the grommet 1 having the above-described configuration is attached to the panel 2, first, the small-diameter cylindrical portion 10 and the hole 3 of the panel 2 are opposed to each other along the axis P. Then, along the arrow K, that is, along the axis P, the diameter-expanded cylinder part 11 or grommet 1 is gradually inserted into the hole 3 from the small-diameter cylinder part 10 or one end part 11a as shown in FIG. Then, as shown in FIG. 9, the outer surface 12 a of the rib 12 comes into contact with the inner edge of the hole 3 of the panel 2. At this time, both ends 12b and 12c of the rib 12 are connected to the outer surface 11c of the enlarged diameter cylindrical portion 11, and the outer surface 12a of the rib 12 is formed in a curved line (curved surface) convex in the outer peripheral direction of the enlarged diameter cylindrical portion 11. In addition, since no step is formed between the rib 12 and the enlarged diameter cylindrical portion 11, the direction perpendicular to (intersects) the axis P of the outer surface 12a of the rib 12 as shown in FIG. The central portion 12d of the contact portion contacts the inner edge of the hole 3 of the panel 2. For this reason, both ends 12 b and 12 c of the rib 12 do not contact the inner edge of the hole 3 of the panel 2.

  Further, when the diameter-expanded cylindrical portion 11, that is, the grommet 1 is inserted (press-fitted) into the hole 3 of the panel 2, the rib 12 and the diameter-expanded cylindrical portion 11 are integrally formed by the inner surface of the hole 3 and the ring portion 4. It is pressed toward the inside of the enlarged diameter cylindrical portion 11. Then, as shown in FIG. 10, the rib 12 and the enlarged diameter cylindrical portion 11 are elastically deformed integrally in a direction in which the inner and outer diameters are reduced. That is, the rib 12 and the enlarged diameter cylindrical portion 11 are elastically deformed in a direction in which the diameter is integrally reduced (indicating that the inner and outer diameters are reduced).

  The hole 3 and the ring portion 4 of the panel 2 are located in the groove 16. Then, as shown in FIG. 11, the lip 18 contacts the hole 3 of the panel 2 and the inner surface of the ring portion 4, and the lip 17 contacts the outer surface of the panel 2. Thus, the lips 17 and 18 are kept watertight between the panel 2 and the locking recess 13 is locked in the hole 3 of the panel 2, so that the grommet 1 is attached to the panel 2.

  According to the present embodiment, the cross-sectional shape of the outer surface 12 a of the rib 12 is formed in a curve that is convex in the outer peripheral direction of the enlarged diameter cylindrical portion 11. Both ends 12 b and 12 c of the rib 12 are connected to the outer surface 11 c of the enlarged diameter cylindrical portion 11. Thus, no step is formed between the rib 12 and the enlarged diameter cylindrical portion 11. For this reason, when the grommet 1 is press-fitted into the hole 3 of the panel 2, both ends 12 b and 12 c of the rib 12 do not contact the inner edge of the hole 3 of the panel 2. For this reason, it can prevent that both ends 12b and 12c of the rib 12 are caught in the inner edge of the hole 3 of the panel 2. FIG. Therefore, the grommet 1 can be easily press-fitted through the hole 3 of the panel 2, that is, attached to the panel 2 more easily.

  Since the rib 12 extends along the axis P of the enlarged diameter cylindrical portion 11, the outer surface 12 a of the rib 12 is pressed when press-fitted into the hole 3 of the panel 2 along the axis P of the enlarged diameter cylindrical portion 11. Can be reliably prevented from being caught by the inner edge of the hole 3 of the panel 2. For this reason, the friction between the outer surface 12a of the rib 12 and the inner edge of the hole 3 of the panel 2 when press-fitting into the hole 3 of the panel 2 along the axis P of the diameter-expanded cylindrical portion 11 can be further reduced. Therefore, the grommet 1 can be attached to the panel 2 constituting the vehicle body more easily.

  A plurality of ribs 12 are provided at intervals along the circumferential direction of the enlarged diameter cylindrical portion 11. For this reason, when press-fitting into the hole 3 of the panel 2, only the outer surfaces 12 a of the plurality of ribs 12 reliably come into contact with the inner edge of the hole 3 of the panel 2. For this reason, when it press-fits in the hole 3 of the panel 2, the contact area with the inner edge of the hole 3 of the panel 2 can be made small reliably, and when attaching to the panel 2, the rib 12 and the diameter expansion cylinder part 11 are attached. Local compression deformation occurs only at the location where the rib 12 is provided, and the diameter-expanded cylindrical portion 11 and the rib 12 are easily elastically deformed in the direction of diameter reduction. Therefore, the grommet 1 can be attached to the panel 2 constituting the vehicle body more easily.

  A plurality of ribs 12 are arranged at equal intervals along the circumferential direction of the enlarged diameter cylindrical portion 11. For this reason, when press-fitting in the hole 3 of the panel 2, the hole 3 of the panel 2 and the enlarged diameter cylindrical part 11 can be made coaxial. Therefore, when press-fitting into the hole 3 of the panel 2, the contact pressure with the inner edge of the hole 3 of the panel 2 can be made uniform along the circumferential direction of the enlarged diameter cylindrical portion 11. Therefore, the grommet 1 can be easily attached to the panel 2 constituting the vehicle body.

  Further, in the above-described embodiment, the plurality of ribs 12 are provided at equal intervals in the circumferential direction of the enlarged diameter cylindrical portion 11. However, in the present invention, the plurality of ribs 12 do not necessarily have to be provided at equal intervals in the circumferential direction of the enlarged diameter cylindrical portion 11, and the plurality of ribs 12 are spaced along the circumferential direction of the enlarged diameter cylindrical portion 11. It only has to be provided.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is a perspective view which shows the grommet concerning one Embodiment of this invention, and the panel to which this grommet is attached. It is a top view of the grommet shown in FIG. It is a side view of the grommet shown in FIG. It is sectional drawing which follows the IV-IV line | wire in FIG. It is sectional drawing which expands and shows the V section in FIG. It is sectional drawing which follows the VI-VI line in FIG. It is sectional drawing which shows the state by which the grommet shown by FIG. 1 was attached to the panel. It is sectional drawing which expands and shows the principal part of the state by which the grommet shown by FIG. 1 was inserted in the hole of the panel. It is sectional drawing which expands and shows the principal part of the state which the inner edge of the hole of the panel contacted the outer surface of the rib of the grommet shown by FIG. It is sectional drawing which expands and shows the principal part of the state by which the grommet shown by FIG. 9 was further inserted in the hole of the panel. It is sectional drawing which expands and shows the principal part in the state which the latching recessed part of the grommet shown by FIG. 10 latched to the hole of the panel. It is sectional drawing which expands and shows the XII part in FIG. It is sectional drawing which follows the XIII-XIII line | wire in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grommet 2 Panel 3 Hole 5 Wire harness 11 Diameter expansion cylinder part 11a One end part (end part by the side of a small diameter)
11b The other end (end on the large diameter side)
11c outer surface 12 rib 12a outer surface 12b, both ends of 12c 13 locking recess P shaft core

Claims (4)

An inner diameter and an outer diameter gradually increase from the end on the small diameter side toward the end on the large diameter side, and the diameter increasing cylindrical portion that is formed in a cylindrical shape and passes the wire harness inside,
A locking recess provided at an end portion on the large-diameter side of the enlarged-diameter cylindrical portion, and inserting the enlarged-diameter cylinder portion into a hole in the panel from the end portion on the small-diameter side, In the grommet that locks in the hole,
Protruding ribs from the outer surface of the diameter-enlarging cylinder part,
The cross-sectional shape of the outer surface of the rib in the direction intersecting the axial center of the enlarged-diameter cylindrical portion is formed in a curved curve that is convex in the outer circumferential direction of the enlarged-diameter cylindrical portion, and the enlarged diameter of the outer surface of the rib A grommet characterized in that both ends in a direction intersecting the axis of the cylindrical portion are connected to the outer surface of the enlarged diameter cylindrical portion.   The grommet according to claim 1, wherein the rib extends along an axis of the enlarged diameter cylindrical portion. A plurality of the ribs are provided,
The grommet according to claim 1 or 2, wherein these ribs are spaced apart from each other along a circumferential direction of the enlarged diameter cylindrical portion.   The said rib is distribute | arranged at equal intervals along the circumferential direction of the said enlarged diameter cylinder part, The grommet of Claim 3 characterized by the above-mentioned.

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