JP2013038978A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a water cut-off performance more stably.SOLUTION: A grommet 20 is a member for cutting-off water at a through hole part 12 having a burring part 14. The grommet 20 comprises a cylindrical part 32 passing through a wire harness 1 and stickable partly to a periphery of the wire harness 1; a seal member 30 having an annular periphery seal part 37 stickable to a periphery part of the burring part 14; a cylindrical body part 54; a holding member 50 having a first holding part 56 formed in a form of jutting out from the periphery part of the body part 54 and capable of being locked to a tip of the burring part 14 and a second holding part 58 formed in a form of jutting out from the periphery part of the body part 54 and capable of being locked to an opening edge of the through hole part 12 from a base end side of the burring part 14, and attached to an inner perimeter of the seal member 30; and a fastening member 70 provided around the periphery of the periphery seal part 37 and being adjustable to shorten a peripheral length of an annular part.

Description

  The present invention relates to a water stop technique in a through hole for inserting a wire harness formed in a metal panel or the like of an automobile.

  Patent Document 1 discloses a grommet for stopping water in a through hole formed in a wall portion for inserting a wire harness. The through-hole targeted in Patent Document 1 is a burring hole having a burring portion. This grommet includes an outer member made of an elastic material and an inner member made of a rigid material. The outer member has a short cylindrical large-diameter cylindrical portion with one open end and the other closed end, and an elliptical annular lip projecting radially outward around the entire edge of the open end of the large-diameter cylindrical portion And an elliptical annular hole end abutting portion protruding radially inward from the vicinity of the base end portion of the lip portion, and a fitting groove formed between the closed end and the hole end abutting portion Yes. Further, the inner member is formed in an elliptical annular shape having a linear frame portion and a semicircular frame portion, and an elliptical annular lip presser projecting radially outward on the entire circumference of the linear frame portion and the semicircular frame portion; A fixing claw having a locking surface that abuts against the wall portion in the vicinity of both ends of the linear frame portion, a spacing portion of the fixing locking claw in the linear frame portion, and an auxiliary locking claw provided in the semicircular frame portion. Have. The fixing locking claw and the auxiliary locking claw are formed so as to bend radially inward.

  The inner member is assembled to the outer member by fitting the lip pressing portion into the fitting groove. Then, by inserting the inner member into the through-hole, the fixing locking claw and the auxiliary locking claw bend radially inward and then return to the original shape and locked to the wall portion, and the lip portion is the wall The hole end abutting portion is pressed against the burring portion.

JP-A-9-63385

  However, since the grommet of Patent Document 1 has a lip portion and a hole end abutting portion that are brought into close contact with each other in the mounting direction with respect to the through hole portion to ensure water tightness, the outer member and the inner member are manufactured. In addition to the product error, the lip portion and the hole end abutting portion are elastic due to the influence of the pressing force on the through-hole portion, the error in the mounting direction due to the mounting mode such as the locking mode of the fixing locking claw and auxiliary locking claw The amount of deformation is relatively easy to change. For this reason, there existed a possibility that dispersion | variation might arise in the water stop performance by a grommet.

  Then, an object of this invention is to ensure the water stop performance more stably.

  A 1st aspect is a grommet for aiming at a water stop in the through-hole part for wire harness penetration which has a cylindrical standing wall part, Comprising: The said wire harness can be penetrated and it is partially in the penetration direction of the said wire harness A seal member comprising: a cylindrical portion that can be in close contact with the outer peripheral portion; and an annular outer peripheral seal portion that is provided on the distal end side of the cylindrical portion and that can be in close contact with the outer peripheral portion of the cylindrical standing wall portion from the outer peripheral side. A cylindrical main body portion and a shape projecting from the outer peripheral portion of the main body portion to the outer peripheral side, directly or indirectly from the distal end side of the cylindrical standing wall portion with respect to the opening edge of the through-hole portion A first presser portion that can be locked to the outer periphery, and a shape projecting from the outer peripheral portion of the main body portion to the outer peripheral side, and the proximal end side of the cylindrical standing wall portion with respect to the opening edge portion of the through-hole portion And a second presser part that can be locked from, and the sealing member A fixing member attached to an inner peripheral portion provided to surround the outer periphery of the seal portion comprises a truncated adjustable clamping member circumferential length of the annular portion.

  A second aspect is the grommet according to the first aspect, wherein the outer peripheral seal portion has an outer peripheral convex portion that protrudes toward an inner peripheral side and extends along a circumferential direction, and the fastening member is It is provided on the outer peripheral side of the outer peripheral convex portion.

  A 3rd aspect is a grommet concerning the 1st or 2nd aspect, Comprising: The said sealing member has a retaining part which protrudes from an outer peripheral part to an outer peripheral side in the base end part of the said outer peripheral seal part.

  A 4th aspect is a grommet which concerns on any one 1st-3rd aspect, Comprising: The said outer periphery seal | sticker part has a linear part and a curve part in the cross sectional view orthogonal to a central axis, The said straight line The portion has a thick portion formed thicker than the curved portion.

  According to the grommet according to the first aspect, the outer peripheral portion of the annular outer peripheral seal portion that can be in close contact with the outer peripheral portion of the cylindrical standing wall portion from the outer peripheral side is enclosed, and the peripheral length of the annular portion can be adjusted to be shortened. Since the member is provided, the outer peripheral seal portion can be tightened and brought into close contact with the outer peripheral portion of the cylindrical standing wall portion by shortening and adjusting the peripheral length of the tightening member after the grommet is attached to the through hole portion. That is, even if an error in the attachment direction occurs due to the attachment mode of the grommet with respect to the through hole portion, the water stop performance is not affected, and the water stop performance can be secured more stably.

  According to the grommet which concerns on a 2nd aspect, since the fastening member is provided in the outer peripheral side of an outer peripheral convex part, the adhesiveness with respect to the inner peripheral part of a through-hole part can be improved, and water stop performance can be improved. .

  According to the grommet according to the third aspect, since the seal member has the retaining portion that protrudes from the outer peripheral portion to the outer peripheral side at the base end portion of the outer peripheral seal portion, the fastening member that is provided to surround the outer peripheral portion of the outer peripheral seal portion Can be prevented from coming off from the base end side of the outer peripheral seal portion.

  According to the grommet according to the fourth aspect, the outer peripheral seal portion has a straight portion and a curved portion in a cross-sectional view orthogonal to the central axis, and the straight portion has a thick portion formed thicker than the curved portion. Therefore, higher water stopping performance can be obtained even in the straight portion.

It is a front view of the through-hole part which showed the attachment position of the grommet. It is the II-II sectional view taken on the line of FIG. It is a sectional side view of a sealing member. It is a front view of a fixing member. It is the VV sectional view taken on the line of FIG. It is a figure which shows the attachment state with respect to the through-hole part of the grommet which concerns on a modification. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG.

  Hereinafter, the grommet 20 which concerns on embodiment is demonstrated (refer FIGS. 1-5). This grommet 20 is for stopping water in the through-hole portion 12 for inserting the wire harness 1.

<Through hole>
First, for convenience of description, the target through-hole portion 12 will be described (see FIGS. 1 and 2). The target through-hole portion 12 is formed in a panel 10 such as a metal panel in a car body of an automobile. Here, the through-hole portion 12 has a burring portion 14 (tubular standing wall portion) formed by forming a through-hole in the panel 10 and then raising the opening edge of the through-hole by burring. Part. More specifically, the burring portion 14 is formed in a cylindrical shape that protrudes to one side of the panel 10 along a direction substantially orthogonal to the panel 10. But the through-hole part 12 may be comprised by welding the cylindrical standing wall part to the opening edge part of the through-hole formed in the panel 10. FIG. In the following description, a portion on one side in the penetration direction of the opening edge portion of the through-hole portion 12 is referred to as a tip portion of the burring portion 14, and a portion on the other side in the penetration direction is burring at the opening edge portion of the through-hole portion 12. This is referred to as the proximal end portion of the portion 14. Here, it is assumed that the through-hole portion 12 is formed in a substantially circular shape. That is, the burring part 14 is formed in a substantially cylindrical shape.

  The wire harness 1 is routed through the through hole 12. Then, the grommet 20 closes the gap between the through-hole portion 12 and the wire harness 1 in order to stop water between the distal end side space and the proximal end side space of the burring portion 14 sandwiching the panel 10.

<Grommet>
The grommet 20 includes a seal member 30, a fixing member 50 attached to the inside of the seal member 30, and a fastening member 70 attached to the seal member 30 (see FIG. 2).

  The seal member 30 is formed in a substantially cylindrical shape as a whole, and includes a cylindrical portion 32, a positioning concave portion 35 having a regulated portion 36, and an outer peripheral seal portion 37 from the proximal end portion toward the distal end portion. (See FIG. 3). The seal member 30 is formed of a material that is relatively easily elastically deformed (easily in close contact with an object) such as EPDM (ethylene propylene diene rubber) or an elastomer.

  The cylinder part 32 is formed so that the wire harness 1 can be inserted and can be in close contact with the outer peripheral part of the wire harness 1 in the insertion direction. The cylindrical portion 32 is formed in a substantially cylindrical shape, and has a small diameter portion 33 and a large diameter portion 34.

  The small-diameter portion 33 is a portion located at the proximal end portion of the seal member 30 and is a portion that is in close contact with the outer peripheral portion of the wire harness 1 inserted through the inside thereof. The small diameter portion 33 is set to an inner diameter that is the same as or smaller than the outer diameter of the wire harness 1. And in the state which expanded the small diameter part 33 and let the wire harness 1 pass, and the small diameter part 33 was closely_contact | adhered to the outer peripheral part of the wire harness 1, water tightness was given to the outer peripheral part of the small diameter part 33 and the wire harness 1 extended from there. It is preferable to secure the water stop between the wire harness 1 and the small-diameter portion 33 by winding a tape (not shown) or the like. Moreover, a water stop process may be given by the water stop agent or a water stop sheet | seat between the outer peripheral part of the wire bundle in the wire harness 1, and the small diameter part 33. FIG. Also in this case, the small-diameter portion 33 is said to be in close contact with the wire harness 1 in which a water-stopping agent is applied to the wire bundle or a water-stop sheet is attached.

  The large diameter portion 34 is formed to have a larger diameter than the small diameter portion 33, and is a portion that connects the small diameter portion 33 and the positioning recess 35 on the distal end side. Here, the large-diameter portion 34 has a shape that gradually increases in diameter from the small-diameter portion 33 side (base end side) toward the positioning recess 35 side (tip end side) and then extends along the insertion direction. Is formed. The large diameter portion 34 may include a bellows-shaped portion in a part in the insertion direction.

  The positioning recess 35 has a regulated portion 36 that is positioned with respect to the fixing member 50 by making contact with a first pressing portion (described later) of the fixing member 50 that is attached to the inside of the seal member 30. . The positioning recess 35 is formed in a recess that opens on the inner peripheral side of the seal member 30 and extends in the circumferential direction, and has an internal space in which the first pressing portion 56 can be accommodated. Yes. Further, the positioning recess 35 is formed in a shape protruding from the tip end portion of the large diameter portion 34 in the cylindrical portion 32 to the outer peripheral side.

  The regulated portion 36 is a portion having an annular surface facing the proximal end side of the seal member 30, and forms a side wall portion on the distal end side in the insertion direction of the seal member 30 in the positioning recess 35. The regulated portion 36 is disposed at a position where the annular surface is along the tip of the burring portion 14 when the grommet 20 is attached to the through-hole portion 12. More specifically, the regulated portion 36 (annular surface) is formed along a plane orthogonal to the insertion direction of the seal member 30.

  The positioning recess 35 is configured so that the regulated portion 36 and the other side wall portion abut against the first presser portion 56 from both sides of the seal member 30 in the insertion direction, whereby the insertion direction with respect to the fixing member 50 is determined. Is positioned. Further, the regulated portion 36 is disposed at a position that is substantially flush with the distal end portion of the burring portion 14 when the grommet 20 is attached to the through-hole portion 12.

  The outer peripheral seal portion 37 is a portion formed in an annular shape that can be in close contact with the outer peripheral portion of the burring portion 14 from the outer peripheral side. Here, the outer peripheral seal portion 37 is formed in a cylindrical shape extending from the inner peripheral portion of the restricted portion 36 toward the front side in the insertion direction on the distal end side in the insertion direction of the sealing member 30 of the positioning recess 35. . In other words, the regulated portion 36 is formed in a shape protruding from the base end portion of the outer peripheral seal portion 37 to the outer peripheral side.

  In addition, the outer peripheral seal portion 37 has an outer peripheral convex portion 38 that protrudes toward the inner peripheral side and extends along the peripheral direction in a part of the seal member 30 in the insertion direction. The outer peripheral convex portion 38 is set such that the diameter of the tip portion is the same as or smaller than the outer peripheral portion of the burring portion 14 (slightly smaller here). Here, the outer peripheral convex portion 38 is provided at an intermediate portion of the outer peripheral seal portion 37 in the insertion direction of the seal member 30. And the outer periphery seal part 37 fulfill | performs a water stop function, when the front-end | tip part of the outer periphery convex part 38 closely_contact | adheres to the outer peripheral part of the burring part 14. Of the inner peripheral portion of the outer peripheral seal portion 37, a portion other than the outer peripheral convex portion 38 may come into contact with the outer peripheral portion of the burring portion 14.

  However, the outer peripheral convex portion 38 may be omitted in the outer peripheral seal portion 37, and in this case, it is only necessary that the inner peripheral surface of the outer peripheral seal portion is in close contact with the outer peripheral portion of the burring portion 14.

  In general, the base end portion of the burring portion 14 in the through-hole portion 12 has a curved surface bent by burring (see FIG. 2). And the outer periphery seal | sticker part 37 is formed in the curve shape along the curve part of the base end part of the burring part 14 in the through-hole part 12 in the front-end | tip part. That is, the distal end portion of the outer peripheral seal portion 37 comes into contact with the base end portion of the burring portion 14 from the outer peripheral side, and exhibits a water stop function in an auxiliary manner. In addition, in FIG. 2, the front-end | tip part of the outer periphery seal | sticker part 37 contacts also the surface of the panel 10 in the outer peripheral side of the burring part 14, and this also exhibits the water stop function.

  The fixing member 50 is a member that is inserted into the through-hole portion 12 and fixes the position of the seal member 30 in the insertion direction with respect to the through-hole portion 12 (see FIGS. 2 and 4). The fixing member 50 is formed in an annular shape as a whole and includes a main body portion 54, a first pressing portion 56, and a second pressing portion 58. The fixing member 50 is a resin molded product that is molded from a resin material such as PP (polypropylene) or PU (polyurethane) resin and has a relatively high rigidity (at least is less elastically deformed than the seal member 30).

  The main body 54 is a portion that is formed in a cylindrical shape (here, cylindrical) and is disposed on the inner peripheral side of the burring portion 14. More specifically, the outer diameter of the main body 54 is set to be the same as or smaller than the inner diameter of the burring portion 14 (here, slightly smaller), and the inner diameter is set to be larger than the external shape of the wire harness 1.

  The first pressing portion 56 is a portion that is directly locked to the distal end portion of the burring portion 14 and restricts the movement of the burring portion 14 to the proximal end side with respect to the through hole portion 12 of the main body portion 54. The first pressing portion 56 is formed in a shape protruding from the outer peripheral portion of the main body portion 54 to the outer peripheral side, and the outer peripheral portion is set larger than the inner peripheral portion of the burring portion 14. Here, the first pressing portion 56 is provided at the base end portion of the main body portion 54 and is formed in an annular collar shape having an outer diameter larger than the outer diameter of the burring portion 14.

  The first pressing portion 56 is a portion that performs relative positioning in the insertion direction of the sealing member 30 and the fixing member 50 in a state where the fixing member 50 is attached to the sealing member 30. More specifically, in the state where the fixing member 50 is attached to the seal member 30, the first presser portion 56 is disposed so that the outer peripheral side portion is opposed to the annular surface of the restricted portion 36, and this restricted portion 36 is contacted. The position of the seal member 30 is regulated by contact. Here, the first presser portion 56 is disposed on the inner side of the positioning recess 35 having the regulated portion 36 on the outer peripheral side portion, and the seal member 30 is brought into contact with the regulated portion 36 and the other side wall portion. The position is regulated on both sides in the insertion direction. In relation to the first pressing portion 56, the width dimension of the positioning recess 35 is set to be substantially the same as the thickness dimension of the first pressing portion 56.

  The second presser portion 58 is a portion that is engaged with the opening edge portion of the through-hole portion 12 from the base end side of the burring portion 14. More specifically, the second pressing portion 58 is formed in a shape that protrudes intermittently from the outer peripheral portion of the main body portion 54 in the circumferential direction to the outer peripheral side, and the outer peripheral portion is set larger than the inner peripheral portion of the burring portion 14. Has been. Here, the second presser portion 58 is provided at regular intervals (for example, at four locations at regular intervals) in the circumferential direction at the distal end portion of the main body portion 54. The second pressing portion 58 is set to have a shape in which the projecting dimension gradually increases from the distal end portion of the main body portion 54 toward the proximal end side.

  In the body portion 54, slits 55 are formed on both sides of the second presser portion 58 in the circumferential direction from the distal end portion toward the proximal end side. That is, the fixing member 50 is configured such that the portion of the main body portion 54 where the second pressing portion 58 is provided can be elastically deformed toward the inner peripheral side.

  The fastening member 70 is a member that is provided so as to surround the outer peripheral portion of the outer peripheral seal portion 37 and is capable of shortening and adjusting the peripheral length of the annular portion (see FIGS. 2 and 5). That is, the fastening member 70 has a configuration in which the outer peripheral seal portion 37 is tightened and pressed against the outer peripheral portion of the burring portion 14 by shortening the peripheral length while surrounding the outer peripheral portion of the outer peripheral seal portion 37. Here, the fastening member 70 is provided on the outer peripheral side of the outer peripheral convex portion 38 (a position surrounding the outer peripheral convex portion 38) in the outer peripheral seal portion 37, and the outer peripheral convex portion 38 is mainly adjusted by shortening adjustment. Press against the outer periphery to ensure close contact.

  As described above, at the base end side of the outer peripheral seal portion 37 where the fastening member 70 is provided, the regulated portion as a retaining portion in a manner of projecting from the outer peripheral portion to the outer peripheral side at the base end portion of the outer peripheral seal portion 37. 38 is provided. That is, since the regulated portion 38 exists on the proximal end side of the sealing member 30 of the fastening member 70 provided surrounding the outer peripheral seal portion 37, the fastening member 70 does not come out from the outer periphery of the outer peripheral seal portion 37. It is suppressed.

  Here, a binding band is employed as the fastening member 70. The binding band is connected to a long band-shaped band portion 72 provided with a plurality of locked portions 73 in the longitudinal direction, and a base end portion of the band portion 72, and a distal end portion of the band portion 72 can be inserted. It is a member having a peripheral length maintaining portion 74 having a locking portion 75 that can be selectively locked to a plurality of locked portions 73 of the band portion 72 that is inserted. More specifically, the locked portion 73 has a locked surface that is orthogonal to the longitudinal direction of the band portion 72 and faces the base end side. The locking portion 75 is formed in an arm shape that can be elastically deformed on the side of the peripheral length maintaining portion 74 that is connected to the band portion 72, and can be locked by contacting the locked surface of the locked portion. Is formed.

  The fastening member 70 as a binding band is configured by a portion on the base end side from the circumferential length maintaining portion 74 in the band portion 72 by pulling a distal end side portion of the band portion 72 inserted through the circumferential length maintaining portion 74. The circumferential length of the annular portion is shortened, and the circumferential length can be maintained by the locking portion 75 being locked to one of the locked portions 73 in this state.

  However, the fastening member 70 is not limited to the binding band. For example, a hose band (hose clamp) may be employed as the fastening member. The hose band is connected to a long band-shaped metal band portion in which a plurality of ridges orthogonal to the long direction are provided at equal intervals in the long direction, and a base end portion of the metal band portion, It is a member having a circumferential length maintaining portion having a thread portion that can be inserted through the distal end side portion and that is provided along the insertion direction of the metal band and meshes with a plurality of protruding strip portions. In other words, by rotating the threaded portion of the circumferential length maintaining portion, the circumferential length of the annular portion constituted by the metal band portion can be adjusted by moving a plurality of ridges meshing with the threaded portion. Moreover, you may employ | adopt the wire which made it possible to shorten the periphery length of a cyclic | annular part by bending the cyclic | annular form as a fastening member, and twisting the both ends.

  Next, an operation for attaching the grommet 20 to the through hole portion 12 will be described.

  First, the fixing member 50 is attached to the seal member 30. That is, the distal end side portion (outer peripheral seal portion 37) of the seal member 30 is expanded, and the fixing member 50 is fitted inside the seal member 30. More specifically, the outer peripheral portion of the first pressing portion 56 is disposed in the positioning recess 35, and the main body portion 54 is disposed on the inner peripheral side of the outer peripheral seal portion 37. In this state, a gap for disposing the burring portion 14 is provided between the main body portion 54 and the outer peripheral seal portion 37.

  Further, the fastening member 70 is attached so as to surround the outer peripheral portion of the outer peripheral seal portion 37. More specifically, the front end side portion of the band portion 72 is passed through the circumferential length maintaining portion 74 so as to surround the outer circumferential portion of the outer circumferential seal portion 37. In a stage before attaching the grommet 20 to the through-hole portion 12, the fastening member 70 may be adjusted to be equal to or longer than the peripheral length of the outer peripheral portion of the outer peripheral seal portion 37. Furthermore, the fastening member 70 is preferably adjusted to a shorter circumferential length than the circumferential length of the outer peripheral portion of the distal end portion of the outer peripheral seal portion 37 and the positioning concave portion 35 (regulated portion 36). Thereby, it can suppress that the fastening member 70 remove | deviates from the state attached to the sealing member 30. FIG.

  Next, the grommet 20 is attached to the through hole 12. More specifically, the second pressing portion 58 and the main body portion 54 of the fixing member 50 are inserted into the through-hole portion 12 so that the burring portion 14 is disposed between the main body portion 54 and the outer peripheral seal portion 37. To do. At this time, the outer peripheral convex portion 38 of the outer peripheral seal portion 37 is pressed against the outer peripheral portion of the burring portion 14 to be elastically deformed and closely adhered. Further, the portion of the main body portion 54 provided with the second pressing portion 58 abuts against the inner peripheral portion of the burring portion 14 and is elastically deformed toward the inner peripheral side, so that the second pressing portion 58 exceeds the through hole portion 12. By the way, it returns to its original shape. And the 2nd presser part 58 will be in the state latched from the base end side of the burring part 14 with respect to the opening edge part of the through-hole part 12. FIG. On the other hand, the first pressing portion 56 is in a state of being locked with respect to the distal end portion of the burring portion 14.

  That is, the fixing member 50 is fixed to the through-hole portion 12 by the first presser portion 56 and the second presser portion 58 being locked to the respective opening edge portions of the through-hole portion 12. Further, the seal member 30 is fixed in the penetrating direction with respect to the through-hole portion 12 via the fixing member 50.

  Finally, the circumferential length of the fastening member 70 provided surrounding the outer peripheral portion of the outer peripheral seal portion 37 is adjusted to be shortened. That is, the outer peripheral seal portion 37 is tightened and pressed against the outer peripheral portion of the burring portion 14 to be brought into close contact therewith. Thereby, the outer periphery seal | sticker part 37 (mainly outer periphery convex part 38) is compressed elastically more largely.

  As described above, the grommet 20 is attached to the through-hole portion 12. Note that the wire harness 1 may be inserted after the grommet 20 is attached to the through-hole portion 12, or before the combination of the seal member 30 and the second fixing portion 62 to which the fixing member 50 is attached, The through hole 12 may be inserted in advance.

  In addition, here, the attaching operation of the grommet 20 to the through-hole portion 12 has been described with an example in which the fastening member 70 is attached to the seal member 30 at a stage before the grommet 20 is attached to the through-hole portion 12. is not. That is, the fastening member 70 may be shortened and adjusted together with the attachment to the seal member 30 after the seal member 30 and the fixing member 50 are attached to the through-hole portion 12.

  So far, the example in which the grommet 20 is formed in an annular shape as a whole corresponding to the circular through-hole portion 12 has been described, but when the through-hole portion 12 is formed in an elliptical shape or a polygonal shape, It may be formed in an elliptical ring shape or a polygonal ring shape corresponding to the shape.

  FIG. 6 shows a grommet 120 attached to a substantially elliptical through-hole portion 12 (burring portion 14) connecting a pair of semicircular arc-shaped curved portions with a pair of straight line portions. The grommet 120 includes a seal member 130, a fixing member 150, and a fastening member 70. The seal member 130 includes a cylindrical portion 132 having a large-diameter portion 134 that extends from the cylindrical small-diameter portion 33 to an elliptical shape, an elliptical annular positioning concave portion 135 having a regulated portion 136 having an elliptical annular surface, and an outer peripheral convex portion. And an outer peripheral seal portion 137 having an elliptical annular shape having 138. In addition, the fixing member 150 is formed in an elliptical ring shape as a whole, and includes a main body portion 154, a first pressing portion 156, and a second pressing portion 158.

  More specifically, the elliptical annular outer peripheral seal portion 137 has a substantially elliptic shape in which a pair of straight arc portions connect a pair of semicircular arc-shaped curved portions corresponding to the shape of the through-hole portion 12 (burring portion 14). Is formed. For this reason, when the outer peripheral seal portion 137 is tightened by the tightening member 70, the semicircular arc-shaped curved portion is stably pressed toward the center of curvature, but the urging force acts on the burring portion 14. The pressing force acting on the inner peripheral side is smaller than the pressing force acting on the curved portion.

  Therefore, the grommet 120 shown in FIG. 6 employs a shape for ensuring a pressing force against the burring portion 14 by the fastening member 70 acting on the straight portion of the outer peripheral seal portion 137. More specifically, the outer peripheral seal part 137 has a thick part 139 formed in the straight part so as to be thicker than the curved part. Preferably, the thick part 139 of the outer peripheral seal part 137 is formed to be thicker as it approaches the center of the straight line part. The outer peripheral portion of the outer peripheral seal portion 137 has an arc shape that is convex toward the outer peripheral side. FIG. 7 shows a cross-sectional view orthogonal to the circumferential direction in the curved portion, and FIG. 8 shows a cross-sectional view orthogonal to the circumferential direction in the central portion of the straight portion.

  And according to the structure which the outer periphery seal | sticker part 137 has a linear part and a curved part in the cross sectional view orthogonal to a central axis, and has the thick part 139 formed thicker than the curved part in the linear part. When the fastening member 70 is fastened, higher water stopping performance can be obtained even in the straight portion.

  Further, the first presser portion 56 has been described so far as being formed in the shape of an annular collar, but is not limited thereto. For example, the first presser portion 56 may be formed in a shape that projects intermittently from the outer peripheral portion of the main body portion 54 to the outer peripheral side in the circumferential direction. In addition, the second presser portion may be formed in a shape protruding from the entire circumferential direction of the main body portion 54. In this case, a plurality of slits may be formed in the main body portion from the distal end portion toward the proximal end side along the central axis.

  Further, the positioning recess 35 is not limited to a shape that protrudes to the outer peripheral side of the cylindrical portion 32 and the outer peripheral seal portion 37, but may have a shape having opposing side wall portions that protrude to the inner peripheral side. Good. In this case, the regulated portion 36 is preferably provided at a position facing the tip end portion of the burring portion 14 in a state of being attached to the through hole portion 12 of the grommet 20. Further, in this case, the first pressing portion 56 of the fixing member 50 is configured to be indirectly locked to the opening edge portion of the through-hole portion 12 from the front end side of the burring portion 14 via the restricted portion 36. .

  Further, portions other than the restricted portion 36 in the positioning recess 35 may be omitted. In other words, the sealing member 30 only needs to be prevented from being pulled out of the through-hole portion 12 by the pressing portion 50 of the fixing member 50 in the attached state with respect to the through-hole portion 12, and if the restricted portion 36 is provided, its function is exhibited. it can. In this case, the sealing member only needs to be formed in a shape in which the restricted portion 36 extends from the tip end portion of the cylindrical portion 32 toward the inner peripheral side.

  According to the grommet 20 according to the embodiment, after the grommet 20 is attached to the through-hole portion 12, the outer peripheral seal portion 37 is tightened and the outer peripheral portion of the burring portion 14 is tightly adhered by shortening and adjusting the peripheral length of the tightening member 70. Can be made. For this reason, even if the attachment mode with respect to the through-hole portion 12 of the grommet 20 causes an error in the attachment direction, the water stop performance is not affected, and the water stop performance can be secured more stably.

  Further, since the outer peripheral seal portion 37 is in close contact with the outer peripheral portion of the burring portion 14 and stops water, the sealing member 30 can be easily removed from the through-hole portion 12 from the attachment side of the grommet 20 by removing the fastening member 70. Can be removed.

  Further, since the regulated portion 36 is formed in a shape projecting from the base end portion of the outer peripheral seal portion 37 to the outer peripheral side, the fastening member 70 provided to surround the outer peripheral portion of the outer peripheral seal portion 37 is the outer peripheral seal portion 37. It can suppress that it remove | deviates from the base end side.

  Further, since the outer peripheral seal portion 37 has an outer peripheral convex portion 38 that protrudes toward the inner peripheral side and extends along the circumferential direction, and the fastening member 70 is provided on the outer peripheral side of the outer peripheral convex portion 38, the effect is further improved. In particular, the degree of adhesion to the inner peripheral portion of the through-hole portion 12 can be improved, and the water stop performance can be improved.

DESCRIPTION OF SYMBOLS 1 Wire harness 12 Through-hole part 14 Burring part 20,120 Grommet 30,130 Seal member 32,132 Cylinder part 36,136 Regulated part 37,137 Outer periphery seal part 38,138 Outer periphery convex part 50,150 Fixing member 54,154 Main body part 56, 156 First presser part 58, 158 Second presser part 70 Fastening member 139 Thick part

Claims (4)

A grommet for stopping water at a through hole for inserting a wire harness having a cylindrical standing wall,
A cylindrical portion that can be inserted through the wire harness and can be partially in close contact with the outer peripheral portion of the wire harness in the insertion direction, and provided on the distal end side of the cylindrical portion, and outer periphery with respect to the outer peripheral portion of the cylindrical standing wall portion A seal member having an annular outer peripheral seal portion that can be closely contacted from the side;
A cylindrical main body and a shape projecting from the outer peripheral portion of the main body portion to the outer peripheral side, and directly or indirectly from the front end side of the cylindrical standing wall portion with respect to the opening edge of the through hole portion A first presser portion that can be locked to the outer periphery, and a shape that protrudes from the outer peripheral portion of the main body portion to the outer peripheral side, and from the proximal end side of the cylindrical standing wall portion with respect to the opening edge portion of the through-hole portion A second holding portion that can be locked, and a fixing member that is attached to the inner peripheral portion of the seal member;
A fastening member provided to surround the outer peripheral portion of the outer peripheral seal portion and capable of adjusting the shortened peripheral length of the annular portion;
With grommet. The grommet according to claim 1,
The outer peripheral seal portion has an outer peripheral convex portion that protrudes toward the inner peripheral side and extends along the circumferential direction,
The said fastening member is a grommet provided in the outer peripheral side of the said outer periphery convex part. The grommet according to claim 1 or 2, wherein
The grommet, wherein the seal member has a retaining portion that protrudes from the outer peripheral portion to the outer peripheral side at the proximal end portion of the outer peripheral seal portion. The grommet according to any one of claims 1 to 3, wherein
The outer peripheral seal portion has a straight portion and a curved portion in a cross-sectional view orthogonal to a central axis, and has a thick portion formed thicker than the curved portion in the straight portion.

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