WO2017126351A1 - Grommet - Google Patents

Grommet Download PDF

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Publication number
WO2017126351A1
WO2017126351A1 PCT/JP2017/000358 JP2017000358W WO2017126351A1 WO 2017126351 A1 WO2017126351 A1 WO 2017126351A1 JP 2017000358 W JP2017000358 W JP 2017000358W WO 2017126351 A1 WO2017126351 A1 WO 2017126351A1
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WO
WIPO (PCT)
Prior art keywords
diameter cylindrical
cylindrical portion
grommet
small
vehicle body
Prior art date
Application number
PCT/JP2017/000358
Other languages
French (fr)
Japanese (ja)
Inventor
雄介 安東
Original Assignee
住友電装株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友電装株式会社 filed Critical 住友電装株式会社
Publication of WO2017126351A1 publication Critical patent/WO2017126351A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings

Definitions

  • the present invention relates to a grommet that is attached to a through-hole formed in a vehicle body panel in a state of being sheathed on a wire harness.
  • the grommet is formed on the vehicle body panel in a state of being sheathed on the wire harness. It is inserted into the through hole.
  • This grommet is closely fitted in a small diameter cylindrical portion fixed in close contact with the outer peripheral surface of the wire harness and a through hole in the vehicle body panel, as described in, for example, Japanese Patent Application Laid-Open No. 2004-187353 (Patent Document 1).
  • the fixed large-diameter cylinder part and the enlarged-diameter cylinder part that connects them are integrally provided, preventing water from entering the vehicle interior from the outside through the through hole. It has become so.
  • a locking projection protruding to the outer peripheral side is provided at an end of the large diameter cylindrical portion on the large diameter cylindrical portion side.
  • the grommet sheathed on the wire harness is attached to the through hole of the vehicle body panel. That is, when the grommet is in a single product state, the outer diameter of the locking projection is larger than the inner diameter of the through hole of the vehicle body panel.
  • the portion provided with the locking projection is elastically deformed to the inner peripheral side, and the outer diameter of the locking projection is made smaller than the inner diameter of the through hole of the vehicle body panel.
  • the grommet can be inserted into the through hole of the vehicle body panel, and after the locking projection has passed through the through hole through the through hole of the vehicle body panel, the wire harness and the grommet are released from tension.
  • the grommet is mounted on the vehicle body panel by returning the locking protrusion to its original shape by an elastic restoring action.
  • the plate thickness dimensions of the enlarged diameter cylindrical portion and the large diameter cylindrical portion in the grommet are required to some extent, but when these plate thickness dimensions are increased, There is a problem that the deformation rigidity when the grommet is pulled toward the distal end in the insertion direction is increased, and it is difficult to elastically deform the locking protrusion toward the inner peripheral side.
  • reducing the grommet thickness to improve the insertability of the grommet into the through-hole of the vehicle body panel reduces the holding power of the vehicle body panel sufficiently. There was a risk that it could not be secured.
  • the present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is a novel, which can improve the insertability of the vehicle body panel into the through hole while ensuring the holding power of the vehicle body panel. It is to provide a grommet with a simple structure.
  • a large-diameter cylindrical portion and a small-diameter cylindrical portion that are spaced apart from each other are connected by an enlarged-diameter cylindrical portion, and at the end portion on the large-diameter cylindrical portion side in the enlarged-diameter cylindrical portion.
  • the portion adjacent to the locking projection in the enlarged diameter cylindrical portion on the small diameter cylindrical portion side is a thin portion with a reduced thickness, whereas the small diameter cylindrical portion is opposed to the thin portion.
  • the portion adjacent on the side and the portion adjacent on the large-diameter cylindrical portion side with respect to the locking protrusion are each a thick portion having a thickness dimension larger than that of the thin portion.
  • the inner surfaces of the meat portions are connected to each other by a reinforcing portion.
  • the portion of the enlarged diameter cylindrical portion adjacent to the locking projection on the small diameter cylindrical portion side (the front end side in the grommet insertion direction) has a thin wall thickness. Therefore, when the grommet is inserted into the through hole of the vehicle body panel, when the grommet is pulled toward the distal end in the insertion direction, the thin portion can be preferentially extended and deformed in the tension direction. That is, by pulling the grommet toward the distal end in the insertion direction and deforming the thin wall portion, it is easily realized that the adjacent locking protrusions are displaced toward the inner peripheral side to reduce the outer diameter of the locking protrusions. obtain.
  • the inner surfaces of the thick part adjacent to the thin part on the small diameter cylinder part side and the thick part adjacent to the locking protrusion on the large diameter cylinder part side are connected to each other by the reinforcing part. Therefore, by pulling the grommet toward the distal end side in the insertion direction, a tensile force is effectively exerted from the inner peripheral side to the thick part on the small diameter cylindrical part side and the thick part on the large diameter cylindrical part side through the reinforcing part. Thereby, the displacement to the inner peripheral side of the locking projection due to the pulling of the grommet toward the distal end in the insertion direction can be caused more stably, and the insertability into the through hole of the vehicle body panel can be improved.
  • the thickness of the locking projection and the large-diameter cylindrical portion is not reduced, so that the holding power of the vehicle body panel in the grommet is not impaired. Therefore, in the grommet of this aspect, it is possible to improve the insertability of the vehicle body panel into the through hole while ensuring the holding force of the vehicle body panel. Further, since the thin-walled portion is provided in the enlarged diameter cylindrical portion while maintaining the holding power of the vehicle body panel, the grommet can be reduced in weight and cost can be reduced.
  • a second aspect of the present invention is the grommet according to the first aspect, wherein a plurality of the reinforcing portions are provided in the circumferential direction.
  • the weight is further reduced as compared with the case where the reinforcing portions are continuously provided over the entire circumference in the circumferential direction. And cost reduction.
  • a third aspect of the present invention is the grommet according to the second aspect, wherein the plurality of reinforcing portions are provided at equal intervals in the circumferential direction.
  • the deformation of the grommet accompanying pulling to the distal end side in the insertion direction is substantially uniform in the circumferential direction. Will occur. Therefore, local concentration of strain and stress in the grommet can be avoided, and durability can be improved. Further, since the locking projection of the grommet is reduced in diameter toward the inner periphery substantially uniformly over the entire circumference, the insertability into the through hole of the vehicle body panel can be further improved.
  • a fourth aspect of the present invention is the grommet according to any one of the first to third aspects, wherein an inner surface of the reinforcing portion extends linearly in a longitudinal section.
  • the inner surface of the reinforcing portion that connects the two thick portions to each other extends linearly, so that the reinforcing portion protrudes greatly inward of the grommet, for example. Is avoided. Thereby, a possibility that the deformation
  • the possibility that the reinforcement portion and the wire harness come into contact with each other to prevent the wire harness from being routed can be reduced.
  • an end portion on the small diameter cylindrical portion side of the large diameter cylindrical portion is coupled to the small diameter cylindrical portion.
  • a connecting portion is provided, and the connecting portion is flexible so that the small-diameter cylindrical portion can be tilted with respect to the enlarged-diameter cylindrical portion.
  • the end portion on the small-diameter cylindrical portion side in the large-diameter cylindrical portion is a connecting portion, and the connecting portion is flexible so that the small-diameter cylindrical portion with respect to the large-diameter cylindrical portion is provided. Since the inclination angle can be arbitrarily adjusted, the central axis direction of the small-diameter cylindrical portion can be appropriately changed in accordance with the extending direction of the wire harness. Therefore, it is not necessary to separately manufacture grommets with different central axis directions of the small diameter cylindrical portion, and versatility can be improved.
  • the engagement protrusion is stably reduced in diameter toward the inner peripheral side by being pulled toward the small diameter side, so that the holding force of the vehicle body panel is maintained,
  • the insertability with respect to the through hole of the vehicle body panel can be improved.
  • FIG. IV-IV sectional drawing in FIG. VV sectional drawing in FIG. It is explanatory drawing for demonstrating the state by which the wire harness was pulled by the insertion direction front end side in the grommet in FIG. 1, Comprising: The longitudinal cross-sectional view corresponding to FIG. It is explanatory drawing for demonstrating the state which inclined the small diameter cylinder part with respect to the enlarged diameter cylinder part in the grommet in FIG. 1, Comprising: The longitudinal cross-sectional view corresponding to FIG. The longitudinal cross-sectional view of the grommet as another aspect of this invention.
  • FIGS. 1 to 5 show a grommet 10 as an embodiment of the present invention.
  • the grommet 10 is externally attached to the wire harness 16 when the wire harness 16 is inserted through the through-hole 14 provided in the vehicle body panel 12 into the vehicle body panel 12 that partitions the vehicle interior such as an engine room and the vehicle interior. In this state, it is mounted in the through hole 14 of the vehicle body panel 12. This prevents water from entering through the through hole 14 of the vehicle body panel 12.
  • the axial direction refers to the vertical direction in FIG. 4 which is the central axis direction of the grommet 10, while the radial direction is a direction orthogonal to the central axis, for example, FIG. 4 or FIG. Say right inside.
  • the upper side refers to the upper side in FIG. 4 which is the front end side in the insertion direction of the grommet 10 into the through hole 14 of the vehicle body panel 12, while the lower side is the side attached to the vehicle body panel 12 in the grommet 10.
  • the lower part of 4 is said.
  • the grommet 10 includes a small diameter cylindrical portion 18 that is fixed to the outer peripheral surface of the wire harness 16 and a large diameter cylindrical portion 20 that is fixed to the through hole 14 of the vehicle body panel 12. 18 and the large-diameter cylindrical portion 20 are connected by an enlarged-diameter cylindrical portion 22 that gradually increases in diameter in the axial direction toward the large-diameter cylindrical portion 20 side. That is, the small diameter cylindrical portion 18 is located on the inner peripheral side of the large diameter cylindrical portion 20 and the enlarged diameter cylindrical portion 22.
  • the small-diameter cylindrical portion 18 extends in the axial direction, and in the present embodiment, the small-diameter cylindrical portion 22 extends outward in the axial direction from the small-diameter side end portion and the large-diameter cylindrical portion 20. Thereby, the axial length of the small diameter cylindrical portion 18 is sufficiently secured, and the wire harness 16 is stably held when the wire harness 16 is inserted into the small diameter cylindrical portion 18. Further, tape stop ribs 24, 24 projecting to the outer peripheral side are formed at both end portions in the axial direction of the small diameter cylindrical portion 18, and the small diameter cylindrical portion 18 and the wire are provided at the portions where the tape fixing ribs 24, 24 are provided.
  • the wire harness 16 By fixing the harness 16 to the tape, the wire harness 16 can be more firmly fixed to the small diameter cylindrical portion 18. Furthermore, an inward protruding rib 26 protruding toward the inner peripheral side is provided on the inner peripheral surface at the lower end of the small diameter cylindrical portion 18, and the inward protruding rib 26 abuts against the wire harness 16. As a result, the wire harness 16 is more firmly fixed to the small-diameter cylindrical portion 18 and water can be prevented from entering through the small-diameter cylindrical portion 18.
  • the large-diameter cylindrical portion 20 includes a substantially cylindrical peripheral wall portion 28 that extends in a substantially axial direction with a larger diameter than the small-diameter cylindrical portion 18 and a flange portion 30 that extends in an annular shape from the lower end of the peripheral wall portion 28 to the outer peripheral side. It consists of and.
  • the flange portion 30 is inclined so that the thickness of the flange portion 30 gradually increases as the upper surface becomes the outer peripheral side, while the lower surface is flat in the radial direction.
  • a plurality of (in this embodiment, two) substantially annular elastic protrusions 32 projecting upward are provided on the upper surface of the flange portion 30.
  • the elastic protrusions 32 and 32 are pressed and deformed by the vehicle body panel 12 when the grommet 10 is attached to the vehicle body panel 12, thereby further preventing water from entering through the through hole 14 from the outside of the vehicle compartment to the vehicle interior. Can be done.
  • the small-diameter cylindrical portion 18 and the large-diameter cylindrical portion 20 are disposed with their central axes substantially equal.
  • the small-diameter cylindrical portion 18 is inserted in the radially inward direction of the large-diameter cylindrical portion 20, and the outer peripheral surface of the small-diameter cylindrical portion 18 and the upper end portion of the peripheral wall portion 28 are separated by the enlarged-diameter cylindrical portion 22. It is connected.
  • the enlarged diameter cylindrical portion 22 of the present embodiment has a thin connecting portion 34 continuously extending over the entire circumference in the circumferential direction, an annular wall portion 36 extending with a predetermined dimension in the radial direction, and a small inclination angle with respect to the radial direction.
  • the first inclined cylinder part 38 and the second inclined cylinder part 40 having a larger inclination angle with respect to the radial direction than the first inclined cylinder part 38 are configured. That is, the outer peripheral surface of the small diameter cylindrical portion 18 is connected to the connecting portion 34, and the annular wall portion 36 extends flatly outward in the radial direction from the outer peripheral end portion of the connecting portion 34. Further, the first inclined cylinder portion 38 extending from the outer peripheral end portion of the annular wall portion 36 is connected to the inner peripheral end portion of the second inclined cylindrical portion 40, and the outer peripheral end portion of the second inclined cylindrical portion 40 is a peripheral wall. It is connected to the upper end of the part 28. Therefore, the enlarged diameter cylindrical portion 22 of the present embodiment is bent so as to protrude outward at the portion where the first inclined cylindrical portion 38 and the second inclined cylindrical portion 40 are connected to each other in the radially intermediate portion. A portion 42 is formed.
  • an end portion on the outer peripheral side than the second inclined cylindrical portion 40 (end portion on the large diameter cylindrical portion 20 side) is located on the outer peripheral side with respect to the peripheral wall portion 28, and the peripheral wall A portion protruding outward from the portion 28 is a locking protrusion 44 that continuously extends over the entire circumference in the circumferential direction. That is, the engaging protrusion 44, the peripheral wall portion 28, and the flange portion 30 constitute an annular groove 46 that opens to the outer peripheral side and continuously extends over the entire circumference in the circumferential direction.
  • the outer diameter dimension of the locking projection 44 is larger than the inner diameter dimension of the through hole 14 of the vehicle body panel 12.
  • connection part 34 of this embodiment has flexibility by making plate
  • the small-diameter cylindrical portion 18 is connected to the annular wall portion 36 via the flexible connecting portion 34, so that the small-diameter cylindrical portion 18 can be inclined with respect to the annular wall portion 36. Yes.
  • the plate thickness dimension t (see FIG. 4) of the second inclined cylindrical portion 40 is the smallest on the outer peripheral side of the connecting portion 34 in the diameter-expanded cylindrical portion 22, and the thin portion is configured by the second inclined cylindrical portion 40.
  • the thin wall portion (second inclined cylinder portion 40) is provided in a portion adjacent to the locking projection 44 on the small diameter cylinder portion 18 side.
  • the plate thickness dimension T 2 (see FIG.
  • a thick portion (first inclined cylindrical portion 38) is provided in a portion adjacent to the thin portion (second inclined cylindrical portion 40) on the small diameter cylindrical portion 18 side, and against the locking projection 44.
  • a thick wall portion (peripheral wall portion 28) is provided in a portion adjacent to the large-diameter cylindrical portion 20 side.
  • the plate thickness dimension of the annular wall portion 36 is larger than the plate thickness dimension t of the second inclined cylinder portion 40, and the first inclined cylinder portion 38 is from the second inclined cylinder portion 40 side.
  • the plate thickness dimension is gradually increased toward the annular wall portion 36 side. That is, the minimum plate thickness dimension of the first inclined cylinder portion 38 is made equal to the plate thickness dimension t of the thin wall portion (second inclined cylinder portion 40), while the plate thickness dimension of the annular wall portion 36 is the first inclined cylinder portion.
  • the maximum plate thickness dimension T 1 is 38.
  • the inner surfaces 48, 50 of both thick parts are connected by a reinforcing part 52.
  • a thin plate-like (rib-like) reinforcing portion 52 is provided from the inner surface 48 of the first inclined cylinder portion 38 to the upper end portion of the inner surface 50 of the peripheral wall portion 28, that is, the inner surface of the annular wall portion 36.
  • the outer peripheral end portion of the peripheral wall portion and the upper end portion of the peripheral wall portion 28 are connected by a reinforcing portion 52.
  • the reinforcing portion 52 is provided with a substantially triangular cross section in the thickness direction inward of the bent portion 42, and the inner surface 54 of the reinforcing portion 52 is, for example, in the longitudinal cross section of the grommet 10 shown in FIG. It is inclined with respect to the central axis direction and extends linearly.
  • six reinforcing portions 52 are provided at substantially equal intervals in the circumferential direction.
  • Such a reinforcing portion can be provided continuously over the entire circumference in the circumferential direction, for example, but by providing it partially in the circumferential direction, the weight of the grommet can be reduced and the cost can be reduced. Further, by providing at substantially equal intervals in the circumferential direction, concentration of local stress and strain during deformation can be avoided and durability can be improved.
  • the grommet 10 having the above structure is integrally formed of a rubber material such as EPDM (ethylene propylene rubber), CR (chloroprene rubber), SI (silicone rubber).
  • EPDM ethylene propylene rubber
  • CR chloroprene rubber
  • SI silicone rubber
  • the wire harness 16 is inserted into the small diameter cylindrical portion 18 of the grommet 10, and tape fixing ribs 24 and 24 at both axial ends of the small diameter cylindrical portion 18 are fixed to the grommet 10. Is fixed. Then, by inserting the grommet 10 into the through hole 14 of the vehicle body panel 12 with the grommet 10 being externally fixed to the wire harness 16, the opening peripheral edge of the through hole 14 is fitted into the annular groove 46 and locked. It is clamped between the axial direction of the protrusion 44 and the flange part 30. Thereby, the grommet 10 is attached to the vehicle body panel 12, and the wire harness 16 is inserted into the vehicle body panel 12 through the through hole 14.
  • the axial distance between the locking projection 44 and the upper surface of the flange portion 30 is substantially equal to or slightly smaller than the plate thickness dimension of the vehicle body panel 12.
  • the grommet 10 When inserting the through hole 14 of the vehicle body panel 12 of the grommet 10, as shown in FIG. 6, by pulling the small diameter cylindrical portion 18 together with the wire harness 16, the grommet 10 is engaged with the locking projection 44.
  • the outer diameter dimension of the locking projection 44 is smaller than the inner diameter dimension of the through hole 14 by being reduced in diameter at the provided portion, so that the grommet 10 can be inserted into the through hole 14. .
  • the enlarged diameter cylindrical portion 22 connected to the small diameter cylindrical portion 18 is deformed so as to extend upward and in the inner circumferential direction.
  • the thinned portion second inclined tubular portion 40
  • a tensile force in the upward and inner circumferential directions is preferentially exerted on the thinned portion.
  • a tensile force in the same direction is exerted on the locking protrusion 44 adjacent to the second inclined cylinder portion 40, and the locking is performed.
  • the protrusion 44 is effectively displaced toward the inner peripheral side.
  • a portion adjacent to the second inclined cylindrical portion 40 on the small diameter cylindrical portion 18 side and a portion adjacent to the locking projection 44 on the large diameter cylindrical portion 20 side (the first inclined cylindrical portion 38 and the peripheral wall). Since the inner surfaces 48, 50 of the portion 28) are connected by the reinforcing portion 52, the tensile force applied to the first inclined cylinder portion 38 is transmitted from the inner peripheral side to the peripheral wall portion 28, so that the peripheral wall portion 28 also has an inner periphery. A force that is pulled in the direction is exerted. Therefore, the locking projection 44 adjacent to the peripheral wall 28 is more easily displaced toward the inner peripheral side.
  • first inclined cylinder part 38 and the peripheral wall part 28 are made thicker than the thin part (second inclined cylinder part 40), the first inclined cylinder part 38 and the peripheral wall part 28 are relatively deformed. The tensile force exerted on the first inclined cylinder portion 38 is stably transmitted to the peripheral wall portion 28.
  • the improvement of the insertability of the grommet 10 into the through hole 14 of the vehicle body panel 12 does not reduce the plate thickness of the locking projection 44 or the large-diameter cylindrical portion 20.
  • the holding force of the panel 12 is not reduced. Therefore, the insertability into the vehicle body panel 12 can be improved without impairing the holding force of the vehicle body panel 12. Further, since the thinned portion is provided in the enlarged diameter cylindrical portion 22 while securing the holding force of the vehicle body panel 12, the grommet 10 can be reduced in weight and cost can be reduced.
  • the reinforcing portions 52 are provided at substantially equal intervals in the circumferential direction, when the grommet 10 is deformed as described above, concentration of local stress and strain is avoided, and durability is improved. Improvement can be achieved. Further, the inner surface 54 of the reinforcing portion 52 extends in a straight line by connecting the inner surfaces 48 and 50 of both thick portions (the first inclined cylinder portion 38 and the peripheral wall portion 28) in the longitudinal section of the grommet 10. Further, the inward protrusion of the grommet 10 by the reinforcing portion 52 is suppressed to be small. Therefore, when the grommet 10 is deformed as described above, not only the possibility that the reinforcing portions 52 come into contact with each other and the deformation is hindered is reduced. Even when the wire harness 16 is inserted with an inclination with respect to (direction), it can be avoided that the reinforcing portion 52 and the wire harness 16 come into contact with each other and obstruct the wiring of the wire harness 16.
  • the central axis direction of the small diameter cylindrical portion 18 is the expanded diameter cylinder.
  • the portion 22 can be arbitrarily adjusted. Therefore, even when the wire harness is inclined and wired with respect to the vehicle body panel, it is not necessary to separately manufacture a grommet in which the small diameter cylindrical portion is inclined with respect to the enlarged diameter cylindrical portion in accordance with the inclination direction.
  • the grommet 10 of this embodiment can be used for general purposes.
  • the 1st inclination cylinder part 38 and the 2nd inclination cylinder part 40 are provided in the diameter expansion cylinder part 22, and while the 2nd inclination cylinder part 40 is made into a thin part, the 2nd inclination cylinder part
  • the first inclined cylinder portion 38 adjacent to 40 and the peripheral wall portion 28 adjacent to the locking projection 44 are thick-walled portions
  • the present invention is not limited to this mode. That is, in the said embodiment, when the 1st inclination cylinder part 38 and the 2nd inclination cylinder part 40 are regarded as one thin part, the annular wall part 36 adjacent by the said thin part and the small diameter cylinder part 18 side is thick. It can be grasped as a part.
  • the annular wall portion 36 and the large-diameter cylindrical portion 20 may be connected with an inclined cylindrical portion 58 having a single inclination angle.
  • the inclined cylindrical portion 58 that is a portion adjacent to the locking projection 44 on the small diameter cylindrical portion 18 side is a thin portion, while the thin portion is adjacent to the thin diameter portion on the small diameter cylindrical portion 18 side.
  • the peripheral wall portion 28 that is a portion adjacent to the annular wall portion 36 and the locking projection 44 on the large-diameter cylindrical portion 20 side is a thick portion. And each inner surface 60 and 50 of both the thick parts 36 and 28 is connected by the reinforcement part 62, and the inner surface 64 of the said reinforcement part 62 is extended linearly like the longitudinal cross-section shown by FIG. Is preferred. Furthermore, in the grommet according to the present invention, an annular wall portion that expands with a predetermined radial dimension is not essential. For example, even from the outer peripheral end of the connecting portion to the large-diameter cylindrical portion is connected with a smooth curved shape. Good.
  • the shape, size, number, and the like of the reinforcing portion are not limited in any way, and can be designed and changed depending on the material of the grommet and the shape of the expanded cylindrical portion.
  • the reinforcing portions 52 have a rib shape (thin plate shape), and the six reinforcing portions 52 are arranged at equal intervals in the circumferential direction.
  • the reinforcing portions 52 continuously extend over the entire circumference in the circumferential direction.
  • the shape is not limited, such as being formed.
  • the reinforcement part should just connect the inner surface of both thick parts, and does not need to be connected with the inner surface of a thin part.
  • the shape of the small diameter cylindrical portion is not limited at all. That is, as in the above-described embodiment, the small-diameter cylindrical portion 18 may protrude outward in the axial direction from the end on the small-diameter side of the large-diameter cylindrical portion 22 and the large-diameter cylindrical portion 20, or the grommet described in Patent Document 1. In this way, the small-diameter cylindrical portion may have a shape that is divided in the axial direction. In addition, when it is set as the shape where the small diameter cylinder part was divided
  • connection part 34 was formed so that the whole had a substantially U-shaped cross section
  • shape of a connection part is not limited. That is, for example, the overall cross-sectional shape may be substantially W-shaped or bellows-shaped, or may be linear.
  • the connecting portion may extend upward, and for example, the connecting portion and the small diameter cylindrical portion may be connected above the annular wall portion.
  • a flexible connecting portion is not essential, and the annular wall portion may be directly connected to the outer peripheral surface of the small diameter cylindrical portion.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Insulating Bodies (AREA)
  • Installation Of Indoor Wiring (AREA)

Abstract

Provided is a grommet having a novel structure with which it is possible to improve insertability into a through hole of a vehicle body panel while ensuring force for holding the vehicle body panel. Disclosed is a grommet 10, wherein: a large-diameter cylindrical part 20 and a small-diameter cylindrical part 18 which are separated from one another are connected by a diameter-expanding cylindrical part 22; an engagement projection 44 projecting toward the outer circumferential side is provided to an end part, on the large-diameter cylindrical part 20 side, of the diameter-expanding cylindrical part 22; the grommet 10 is attached to a vehicle body panel 12 by sandwiching the vehicle body panel 12 with the engagement projection 44 and the large-diameter cylindrical part 20; a portion 40 of the diameter-expanding cylindrical part 22 that is adjacent to the engagement projection 44 on the small-diameter cylindrical part 18 side is formed as a thin part having a small thickness dimension; a portion 38 that is adjacent to the thin part on the small-diameter cylindrical part 18 side and a portion 28 that is adjacent to the engagement projection 44 on the large-diameter cylindrical part 20 side are formed as thick parts having a larger thickness dimension than said thin part; and the respective inner surfaces 48, 50 of the thick parts are mutually connected by a reinforcement part 52.

Description

グロメットGrommet
　本発明は、ワイヤハーネスに外装された状態で、車体パネルに形成された貫通孔に装着されるグロメットに関するものである。 The present invention relates to a grommet that is attached to a through-hole formed in a vehicle body panel in a state of being sheathed on a wire harness.
　従来から、自動車に配索されるワイヤハーネスがエンジンルームなどの車室外と車室内を仕切る車体パネルに挿通される場合には、グロメットが、ワイヤハーネスに外装された状態で、車体パネルに形成された貫通孔に挿入されて装着される。このグロメットは、例えば特開２００４－１８７３５３号公報（特許文献１）に記載されているように、ワイヤハーネスの外周面に密接して固定される小径筒部と、車体パネルの貫通孔に密嵌固定される大径筒部と、それらの間を連結する拡径筒部が一体的に設けられた構造とされており、貫通孔を通じた車室外から車室内への水の浸入などが防止されるようになっている。 Conventionally, when a wire harness routed in an automobile is inserted into a vehicle body panel that partitions the outside of the vehicle compartment such as an engine room and the vehicle interior, the grommet is formed on the vehicle body panel in a state of being sheathed on the wire harness. It is inserted into the through hole. This grommet is closely fitted in a small diameter cylindrical portion fixed in close contact with the outer peripheral surface of the wire harness and a through hole in the vehicle body panel, as described in, for example, Japanese Patent Application Laid-Open No. 2004-187353 (Patent Document 1). The fixed large-diameter cylinder part and the enlarged-diameter cylinder part that connects them are integrally provided, preventing water from entering the vehicle interior from the outside through the through hole. It has become so.
　ところで、かかるグロメットでは、拡径筒部における大径筒部側の端部に、外周側に突出する係止突部が設けられて、当該係止突部と大径筒部とで車体パネルの貫通孔における開口周縁部を挟み込むことで、ワイヤハーネスに外装されたグロメットが車体パネルの貫通孔に装着されるようになっていた。すなわち、グロメットの単品状態では、係止突部における外径寸法が車体パネルの貫通孔における内径寸法より大きくされており、グロメットの車体パネルへの装着時には、ワイヤハーネスと共にグロメットを挿入方向先端側に引っ張ることで、係止突部が設けられている部分を内周側に弾性変形させて、係止突部における外径寸法を車体パネルの貫通孔における内径寸法よりも小さくしていた。これにより、グロメットを車体パネルの貫通孔に挿入することができて、車体パネルの貫通孔にグロメットを挿入して係止突部が貫通孔を通過した後、ワイヤハーネスおよびグロメットの引っ張りを解除して、係止突部を弾性的な復元作用により元の形状に復帰させることでグロメットを車体パネルに装着していた。 By the way, in such a grommet, a locking projection protruding to the outer peripheral side is provided at an end of the large diameter cylindrical portion on the large diameter cylindrical portion side. By sandwiching the peripheral edge of the opening in the through hole, the grommet sheathed on the wire harness is attached to the through hole of the vehicle body panel. That is, when the grommet is in a single product state, the outer diameter of the locking projection is larger than the inner diameter of the through hole of the vehicle body panel. By pulling, the portion provided with the locking projection is elastically deformed to the inner peripheral side, and the outer diameter of the locking projection is made smaller than the inner diameter of the through hole of the vehicle body panel. As a result, the grommet can be inserted into the through hole of the vehicle body panel, and after the locking projection has passed through the through hole through the through hole of the vehicle body panel, the wire harness and the grommet are released from tension. Thus, the grommet is mounted on the vehicle body panel by returning the locking protrusion to its original shape by an elastic restoring action.
　ところが、従来構造のグロメットでは、車体パネルの保持力を確保するためにグロメットにおける拡径筒部や大径筒部の板厚寸法がある程度必要であったが、これらの板厚寸法を大きくすると、グロメットを挿入方向先端側に引っ張った際の変形剛性が大きくなり、係止突部における内周側への弾性変形が困難であるという問題があった。一方、グロメットの車体パネルの貫通孔への挿入性（係止突部における内周側への変形容易性）の向上のためにグロメットの板厚寸法を小さくすると、車体パネルの保持力が十分に確保できなくなるおそれがあった。 However, in the grommet of the conventional structure, in order to secure the holding power of the vehicle body panel, the plate thickness dimensions of the enlarged diameter cylindrical portion and the large diameter cylindrical portion in the grommet are required to some extent, but when these plate thickness dimensions are increased, There is a problem that the deformation rigidity when the grommet is pulled toward the distal end in the insertion direction is increased, and it is difficult to elastically deform the locking protrusion toward the inner peripheral side. On the other hand, reducing the grommet thickness to improve the insertability of the grommet into the through-hole of the vehicle body panel (easiness of deformation to the inner peripheral side of the locking projection) reduces the holding power of the vehicle body panel sufficiently. There was a risk that it could not be secured.
特開２００４－１８７３５３号公報JP 2004-187353 A
　本発明は、上述の事情を背景に為されたものであって、その解決課題は、車体パネルの保持力を確保しつつ、車体パネルの貫通孔への挿入性を向上させることができる、新規な構造のグロメットを提供することにある。 The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is a novel, which can improve the insertability of the vehicle body panel into the through hole while ensuring the holding power of the vehicle body panel. It is to provide a grommet with a simple structure.
　本発明の第一の態様は、相互に離隔する大径筒部と小径筒部とが拡径筒部で接続されていると共に、該拡径筒部における前記大径筒部側の端部には外周側に突出する係止突部が設けられており、該係止突部と前記大径筒部とで車体パネルを挟み込むことで該車体パネルに装着されるようになっているグロメットにおいて、前記拡径筒部における前記係止突部に対して前記小径筒部側で隣接する部分が、肉厚寸法が小さくされた薄肉部とされている一方、該薄肉部に対して前記小径筒部側で隣接する部分と前記係止突部に対して前記大径筒部側で隣接する部分が、それぞれ前記薄肉部よりも肉厚寸法が大きくされた厚肉部とされており、これら両厚肉部の内面が補強部により相互に接続されていることを特徴とするものである。 In the first aspect of the present invention, a large-diameter cylindrical portion and a small-diameter cylindrical portion that are spaced apart from each other are connected by an enlarged-diameter cylindrical portion, and at the end portion on the large-diameter cylindrical portion side in the enlarged-diameter cylindrical portion. Is provided with a locking projection protruding to the outer peripheral side, and the grommet adapted to be mounted on the vehicle body panel by sandwiching the vehicle body panel between the locking projection and the large-diameter cylindrical portion, The portion adjacent to the locking projection in the enlarged diameter cylindrical portion on the small diameter cylindrical portion side is a thin portion with a reduced thickness, whereas the small diameter cylindrical portion is opposed to the thin portion. The portion adjacent on the side and the portion adjacent on the large-diameter cylindrical portion side with respect to the locking protrusion are each a thick portion having a thickness dimension larger than that of the thin portion. The inner surfaces of the meat portions are connected to each other by a reinforcing portion.
　本態様に従う構造とされたグロメットによれば、拡径筒部において係止突部に対して小径筒部側（グロメット挿入方向先端側）で隣接する部分が、肉厚寸法が小さくされた薄肉部とされていることから、グロメットを車体パネルの貫通孔へ挿入させる場合において、グロメットを挿入方向先端側に引っ張った際に、かかる薄肉部を優先的に引張方向へ伸長変形させることができる。すなわち、グロメットを挿入方向先端側に引っ張って薄肉部を変形させることで、隣接する係止突部を内周側へ変位させて係止突部における外径寸法を小さくすることが容易に実現され得る。また、薄肉部に対して小径筒部側で隣接する厚肉部分と係止突部に対して大径筒部側で隣接する厚肉部分のそれぞれの内面が補強部により相互に接続されていることから、グロメットを挿入方向先端側に引っ張ることで、小径筒部側の厚肉部分および補強部を通じて大径筒部側の厚肉部分にも内周側から効果的に引張力が及ぼされる。これにより、グロメットを挿入方向先端側に引っ張ることに伴う係止突部の内周側への変位が一層安定して惹起されて、車体パネルの貫通孔への挿入性が向上され得る。 According to the grommet configured according to this aspect, the portion of the enlarged diameter cylindrical portion adjacent to the locking projection on the small diameter cylindrical portion side (the front end side in the grommet insertion direction) has a thin wall thickness. Therefore, when the grommet is inserted into the through hole of the vehicle body panel, when the grommet is pulled toward the distal end in the insertion direction, the thin portion can be preferentially extended and deformed in the tension direction. That is, by pulling the grommet toward the distal end in the insertion direction and deforming the thin wall portion, it is easily realized that the adjacent locking protrusions are displaced toward the inner peripheral side to reduce the outer diameter of the locking protrusions. obtain. Further, the inner surfaces of the thick part adjacent to the thin part on the small diameter cylinder part side and the thick part adjacent to the locking protrusion on the large diameter cylinder part side are connected to each other by the reinforcing part. Therefore, by pulling the grommet toward the distal end side in the insertion direction, a tensile force is effectively exerted from the inner peripheral side to the thick part on the small diameter cylindrical part side and the thick part on the large diameter cylindrical part side through the reinforcing part. Thereby, the displacement to the inner peripheral side of the locking projection due to the pulling of the grommet toward the distal end in the insertion direction can be caused more stably, and the insertability into the through hole of the vehicle body panel can be improved.
　ここにおいて、かかる挿入性の向上においては、係止突部や大径筒部における板厚寸法が小さくなるものではないことから、グロメットにおける車体パネルの保持力は損なわれるものではない。それ故、本態様のグロメットでは、車体パネルの保持力を確保しつつ、車体パネルの貫通孔への挿入性を向上させることが可能となる。また、車体パネルの保持力を維持しつつ、拡径筒部において薄肉部が設けられることから、グロメットの軽量化やコストダウンも図られ得る。 Here, in the improvement of the insertability, the thickness of the locking projection and the large-diameter cylindrical portion is not reduced, so that the holding power of the vehicle body panel in the grommet is not impaired. Therefore, in the grommet of this aspect, it is possible to improve the insertability of the vehicle body panel into the through hole while ensuring the holding force of the vehicle body panel. Further, since the thin-walled portion is provided in the enlarged diameter cylindrical portion while maintaining the holding power of the vehicle body panel, the grommet can be reduced in weight and cost can be reduced.
　本発明の第二の態様は、前記第一の態様に係るグロメットにおいて、前記補強部が周方向で複数設けられているものである。 A second aspect of the present invention is the grommet according to the first aspect, wherein a plurality of the reinforcing portions are provided in the circumferential direction.
　本態様に従う構造とされたグロメットによれば、補強部が周方向で複数設けられていることから、補強部が周方向の全周に亘って連続して設けられる場合に比べて、一層の軽量化とコストダウンが図られ得る。 According to the grommet having a structure according to this aspect, since a plurality of reinforcing portions are provided in the circumferential direction, the weight is further reduced as compared with the case where the reinforcing portions are continuously provided over the entire circumference in the circumferential direction. And cost reduction.
　本発明の第三の態様は、前記第二の態様に係るグロメットにおいて、前記複数の補強部が周方向で等間隔に設けられているものである。 A third aspect of the present invention is the grommet according to the second aspect, wherein the plurality of reinforcing portions are provided at equal intervals in the circumferential direction.
　本態様に従う構造とされたグロメットによれば、複数の補強部が周方向で等間隔に設けられていることから、挿入方向先端側に引っ張られることに伴うグロメットの変形が周方向で略均等に発生することとなる。それ故、グロメットにおける歪や応力の局所的な集中が回避されて、耐久性の向上が図られ得る。また、グロメットの係止突部が全周に亘って略均等に内周側へ縮径変形することから、車体パネルの貫通孔に対する挿入性の更なる向上が図られ得る。 According to the grommet configured according to this aspect, since the plurality of reinforcing portions are provided at equal intervals in the circumferential direction, the deformation of the grommet accompanying pulling to the distal end side in the insertion direction is substantially uniform in the circumferential direction. Will occur. Therefore, local concentration of strain and stress in the grommet can be avoided, and durability can be improved. Further, since the locking projection of the grommet is reduced in diameter toward the inner periphery substantially uniformly over the entire circumference, the insertability into the through hole of the vehicle body panel can be further improved.
　本発明の第四の態様は、前記第一～第三の何れかの態様に係るグロメットであって、縦断面において、前記補強部の内面が直線状に延びているものである。 A fourth aspect of the present invention is the grommet according to any one of the first to third aspects, wherein an inner surface of the reinforcing portion extends linearly in a longitudinal section.
　本態様に従う構造とされたグロメットによれば、縦断面において、両厚肉部を相互に接続する補強部の内面が直線状に延びていることから、例えば補強部がグロメットの内方に大きく突出することが回避される。これにより、係止突部の内周側への変形が補強部を設けることにより妨げられるおそれが低減され得る。また、ワイヤハーネスがグロメットの中心軸方向に対して傾斜して配索される際などに、補強部とワイヤハーネスとが当接してワイヤハーネスの配索が妨げられるおそれが低減され得る。 According to the grommet having a structure according to this aspect, in the longitudinal section, the inner surface of the reinforcing portion that connects the two thick portions to each other extends linearly, so that the reinforcing portion protrudes greatly inward of the grommet, for example. Is avoided. Thereby, a possibility that the deformation | transformation to the inner peripheral side of a latching protrusion may be prevented by providing a reinforcement part may be reduced. In addition, when the wire harness is routed while being inclined with respect to the central axis direction of the grommet, the possibility that the reinforcement portion and the wire harness come into contact with each other to prevent the wire harness from being routed can be reduced.
　本発明の第五の態様は、前記第一～第四の何れかの態様に係るグロメットにおいて、前記拡径筒部の前記小径筒部側の端部には、該小径筒部に連結される連結部が設けられており、該連結部が可撓性を有することで、前記小径筒部が前記拡径筒部に対して傾斜自在とされているものである。 According to a fifth aspect of the present invention, in the grommet according to any one of the first to fourth aspects, an end portion on the small diameter cylindrical portion side of the large diameter cylindrical portion is coupled to the small diameter cylindrical portion. A connecting portion is provided, and the connecting portion is flexible so that the small-diameter cylindrical portion can be tilted with respect to the enlarged-diameter cylindrical portion.
　本態様に従う構造とされたグロメットによれば、拡径筒部における小径筒部側の端部が連結部とされて、当該連結部が可撓性を有することにより拡径筒部に対する小径筒部の傾斜角度が任意に調節可能とされていることから、ワイヤハーネスの延出方向に合わせて小径筒部の中心軸方向を適宜変更することができる。それ故、小径筒部の中心軸方向が異なるグロメットを別途製造する必要がなく、汎用性の向上が図られ得る。 According to the grommet having a structure according to this aspect, the end portion on the small-diameter cylindrical portion side in the large-diameter cylindrical portion is a connecting portion, and the connecting portion is flexible so that the small-diameter cylindrical portion with respect to the large-diameter cylindrical portion is provided. Since the inclination angle can be arbitrarily adjusted, the central axis direction of the small-diameter cylindrical portion can be appropriately changed in accordance with the extending direction of the wire harness. Therefore, it is not necessary to separately manufacture grommets with different central axis directions of the small diameter cylindrical portion, and versatility can be improved.
　本発明に従う構造とされたグロメットによれば、小径部側に引っ張られることにより係合突部が安定して内周側に縮径変形させられることから、車体パネルの保持力を維持しつつ、車体パネルの貫通孔に対する挿入性の向上が図られ得る。 According to the grommet having a structure according to the present invention, the engagement protrusion is stably reduced in diameter toward the inner peripheral side by being pulled toward the small diameter side, so that the holding force of the vehicle body panel is maintained, The insertability with respect to the through hole of the vehicle body panel can be improved.
本発明の１実施形態としてのグロメットの全体を示す斜視図。The perspective view which shows the whole grommet as one Embodiment of this invention. 図１に示されるグロメットの平面図。The top view of the grommet shown by FIG. 図１に示されるグロメットの底面図。The bottom view of the grommet shown in FIG. 図３におけるＩＶ－ＩＶ断面図。IV-IV sectional drawing in FIG. 図３におけるＶ－Ｖ断面図。VV sectional drawing in FIG. 図１におけるグロメットにおいてワイヤハーネスが挿入方向先端側に引っ張られた状態を説明するための説明図であって、図５に対応する縦断面図。It is explanatory drawing for demonstrating the state by which the wire harness was pulled by the insertion direction front end side in the grommet in FIG. 1, Comprising: The longitudinal cross-sectional view corresponding to FIG. 図１におけるグロメットにおいて小径筒部を拡径筒部に対して傾斜させた状態を説明するための説明図であって、図４に対応する縦断面図。It is explanatory drawing for demonstrating the state which inclined the small diameter cylinder part with respect to the enlarged diameter cylinder part in the grommet in FIG. 1, Comprising: The longitudinal cross-sectional view corresponding to FIG. 本発明の別の態様としてのグロメットの縦断面図。The longitudinal cross-sectional view of the grommet as another aspect of this invention.
　以下、本発明の実施形態について、図面を参照しつつ説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　先ず、図１～５には、本発明の１実施形態としてのグロメット１０が示されている。このグロメット１０は、例えばエンジンルームなどの車室外と車室内とを仕切る車体パネル１２に、当該車体パネル１２に設けられた貫通孔１４を通じてワイヤハーネス１６が挿通される場合に、ワイヤハーネス１６に外装された状態で、車体パネル１２の貫通孔１４に装着されるようになっている。これにより、車体パネル１２の貫通孔１４を通じての水の浸入が防止されるようになっている。なお、以下の説明において、軸方向とは、グロメット１０の中心軸方向となる図４中の上下方向を言う一方、径方向とは、中心軸に直交する方向であり、例えば図４や図５中の左右方向を言う。また、上方とは、グロメット１０の車体パネル１２の貫通孔１４への挿入方向先端側である図４中の上方を言う一方、下方とは、グロメット１０において車体パネル１２に取り付けられる側である図４中の下方を言う。 First, FIGS. 1 to 5 show a grommet 10 as an embodiment of the present invention. The grommet 10 is externally attached to the wire harness 16 when the wire harness 16 is inserted through the through-hole 14 provided in the vehicle body panel 12 into the vehicle body panel 12 that partitions the vehicle interior such as an engine room and the vehicle interior. In this state, it is mounted in the through hole 14 of the vehicle body panel 12. This prevents water from entering through the through hole 14 of the vehicle body panel 12. In the following description, the axial direction refers to the vertical direction in FIG. 4 which is the central axis direction of the grommet 10, while the radial direction is a direction orthogonal to the central axis, for example, FIG. 4 or FIG. Say right inside. Further, the upper side refers to the upper side in FIG. 4 which is the front end side in the insertion direction of the grommet 10 into the through hole 14 of the vehicle body panel 12, while the lower side is the side attached to the vehicle body panel 12 in the grommet 10. The lower part of 4 is said.
　より詳細には、グロメット１０は、ワイヤハーネス１６の外周面に固定される小径筒部１８と車体パネル１２の貫通孔１４に固定される大径筒部２０とを備えており、これら小径筒部１８と大径筒部２０とが、大径筒部２０側に向かって軸方向で次第に大径となる拡径筒部２２で接続されている。すなわち、小径筒部１８が、大径筒部２０および拡径筒部２２の内周側に位置している。 More specifically, the grommet 10 includes a small diameter cylindrical portion 18 that is fixed to the outer peripheral surface of the wire harness 16 and a large diameter cylindrical portion 20 that is fixed to the through hole 14 of the vehicle body panel 12. 18 and the large-diameter cylindrical portion 20 are connected by an enlarged-diameter cylindrical portion 22 that gradually increases in diameter in the axial direction toward the large-diameter cylindrical portion 20 side. That is, the small diameter cylindrical portion 18 is located on the inner peripheral side of the large diameter cylindrical portion 20 and the enlarged diameter cylindrical portion 22.
　この小径筒部１８は軸方向に延びており、本実施形態では、拡径筒部２２における小径側の端部および大径筒部２０よりも軸方向外方まで延びている。これにより、小径筒部１８の軸方向長さが十分に確保されて、小径筒部１８にワイヤハーネス１６が挿通される際に、ワイヤハーネス１６が安定して保持される。また、小径筒部１８の軸方向両端部分には、外周側に突出するテープ止めリブ２４，２４が形成されており、これらテープ止めリブ２４，２４が設けられた箇所において小径筒部１８とワイヤハーネス１６とをテープ固定することにより、ワイヤハーネス１６が小径筒部１８に、より強固に固定され得る。さらに、小径筒部１８の下端における内周面には、内周側に突出する内方突出リブ２６が設けられており、当該内方突出リブ２６がワイヤハーネス１６に対して食い込むように当接することで、ワイヤハーネス１６が小径筒部１８に一層強固に固定されるとともに、小径筒部１８を通じての水の浸入が防止され得る。 The small-diameter cylindrical portion 18 extends in the axial direction, and in the present embodiment, the small-diameter cylindrical portion 22 extends outward in the axial direction from the small-diameter side end portion and the large-diameter cylindrical portion 20. Thereby, the axial length of the small diameter cylindrical portion 18 is sufficiently secured, and the wire harness 16 is stably held when the wire harness 16 is inserted into the small diameter cylindrical portion 18. Further, tape stop ribs 24, 24 projecting to the outer peripheral side are formed at both end portions in the axial direction of the small diameter cylindrical portion 18, and the small diameter cylindrical portion 18 and the wire are provided at the portions where the tape fixing ribs 24, 24 are provided. By fixing the harness 16 to the tape, the wire harness 16 can be more firmly fixed to the small diameter cylindrical portion 18. Furthermore, an inward protruding rib 26 protruding toward the inner peripheral side is provided on the inner peripheral surface at the lower end of the small diameter cylindrical portion 18, and the inward protruding rib 26 abuts against the wire harness 16. As a result, the wire harness 16 is more firmly fixed to the small-diameter cylindrical portion 18 and water can be prevented from entering through the small-diameter cylindrical portion 18.
　一方、大径筒部２０は、小径筒部１８よりも大きな径寸法をもって略軸方向に延びる略円筒状の周壁部２８と、当該周壁部２８の下端から外周側に円環状に広がるフランジ部３０とから構成されている。なお、本実施形態において、フランジ部３０は、下面が径方向に平坦に広がっている一方、上面が、外周側になるにつれてフランジ部３０の肉厚寸法が次第に大きくなるように傾斜しており、当該フランジ部３０の上面には、上方に突出する略環状の弾性突起３２が複数（本実施形態では２つ）設けられている。かかる弾性突起３２，３２が、グロメット１０が車体パネル１２に取り付けられた際に車体パネル１２により押圧変形させられることで、車室外からの車室内への貫通孔１４を通じての水の浸入が一層防止され得る。 On the other hand, the large-diameter cylindrical portion 20 includes a substantially cylindrical peripheral wall portion 28 that extends in a substantially axial direction with a larger diameter than the small-diameter cylindrical portion 18 and a flange portion 30 that extends in an annular shape from the lower end of the peripheral wall portion 28 to the outer peripheral side. It consists of and. In the present embodiment, the flange portion 30 is inclined so that the thickness of the flange portion 30 gradually increases as the upper surface becomes the outer peripheral side, while the lower surface is flat in the radial direction. A plurality of (in this embodiment, two) substantially annular elastic protrusions 32 projecting upward are provided on the upper surface of the flange portion 30. The elastic protrusions 32 and 32 are pressed and deformed by the vehicle body panel 12 when the grommet 10 is attached to the vehicle body panel 12, thereby further preventing water from entering through the through hole 14 from the outside of the vehicle compartment to the vehicle interior. Can be done.
　そして、これら小径筒部１８と大径筒部２０とがそれぞれの中心軸を略等しくされて配設されている。要するに、大径筒部２０の径方向内方に離隔して小径筒部１８が挿通されており、さらに、小径筒部１８の外周面と周壁部２８の上端部とが拡径筒部２２により接続されている。本実施形態の拡径筒部２２は、周方向の全周に亘って連続して延びる肉薄の連結部３４と、径方向に所定寸法をもって広がる環状壁部３６と、径方向に対する傾斜角度が小さな第一傾斜筒部３８と、当該第一傾斜筒部３８よりも径方向に対する傾斜角度が大きくされた第二傾斜筒部４０とから構成されている。すなわち、小径筒部１８の外周面が連結部３４に接続されるとともに、当該連結部３４の外周端部から環状壁部３６が径方向外方に平坦に延び出している。さらに、環状壁部３６の外周端部から延びる第一傾斜筒部３８が、第二傾斜筒部４０の内周端部に接続されているとともに、第二傾斜筒部４０の外周端部が周壁部２８の上端部に接続されている。したがって、本実施形態の拡径筒部２２は、径方向中間部分において、第一傾斜筒部３８と第二傾斜筒部４０とが相互に接続される部分で外方に凸となるような屈曲部分４２をもって構成されている。 The small-diameter cylindrical portion 18 and the large-diameter cylindrical portion 20 are disposed with their central axes substantially equal. In short, the small-diameter cylindrical portion 18 is inserted in the radially inward direction of the large-diameter cylindrical portion 20, and the outer peripheral surface of the small-diameter cylindrical portion 18 and the upper end portion of the peripheral wall portion 28 are separated by the enlarged-diameter cylindrical portion 22. It is connected. The enlarged diameter cylindrical portion 22 of the present embodiment has a thin connecting portion 34 continuously extending over the entire circumference in the circumferential direction, an annular wall portion 36 extending with a predetermined dimension in the radial direction, and a small inclination angle with respect to the radial direction. The first inclined cylinder part 38 and the second inclined cylinder part 40 having a larger inclination angle with respect to the radial direction than the first inclined cylinder part 38 are configured. That is, the outer peripheral surface of the small diameter cylindrical portion 18 is connected to the connecting portion 34, and the annular wall portion 36 extends flatly outward in the radial direction from the outer peripheral end portion of the connecting portion 34. Further, the first inclined cylinder portion 38 extending from the outer peripheral end portion of the annular wall portion 36 is connected to the inner peripheral end portion of the second inclined cylindrical portion 40, and the outer peripheral end portion of the second inclined cylindrical portion 40 is a peripheral wall. It is connected to the upper end of the part 28. Therefore, the enlarged diameter cylindrical portion 22 of the present embodiment is bent so as to protrude outward at the portion where the first inclined cylindrical portion 38 and the second inclined cylindrical portion 40 are connected to each other in the radially intermediate portion. A portion 42 is formed.
　また、拡径筒部２２において、第二傾斜筒部４０よりも外周側の端部（大径筒部２０側の端部）は、周壁部２８よりも外周側に位置しており、かかる周壁部２８よりも外周側に突出する部分が、周方向の全周に亘って連続して延びる係止突部４４とされている。すなわち、かかる係止突部４４と周壁部２８とフランジ部３０とにより、外周側に開口して周方向の全周に亘って連続して延びる環状凹溝４６が構成されている。なお、グロメット１０の単品状態において、この係止突部４４の外径寸法は、車体パネル１２の貫通孔１４の内径寸法よりも大きくされている。 Further, in the enlarged diameter cylindrical portion 22, an end portion on the outer peripheral side than the second inclined cylindrical portion 40 (end portion on the large diameter cylindrical portion 20 side) is located on the outer peripheral side with respect to the peripheral wall portion 28, and the peripheral wall A portion protruding outward from the portion 28 is a locking protrusion 44 that continuously extends over the entire circumference in the circumferential direction. That is, the engaging protrusion 44, the peripheral wall portion 28, and the flange portion 30 constitute an annular groove 46 that opens to the outer peripheral side and continuously extends over the entire circumference in the circumferential direction. When the grommet 10 is in a single product state, the outer diameter dimension of the locking projection 44 is larger than the inner diameter dimension of the through hole 14 of the vehicle body panel 12.
　なお、連結部の具体的な形状は何等限定されるものではないが、本実施形態の連結部３４は、板厚寸法が十分に小さくされることで可撓性を有しており、全体として上方に開口する略Ｕ字状断面をもって周方向の全周に亘って連続して形成されている。このように、小径筒部１８が環状壁部３６に対して可撓性を有する連結部３４を介して連結されることにより、小径筒部１８が環状壁部３６に対して傾斜自在とされている。 In addition, although the specific shape of a connection part is not limited at all, the connection part 34 of this embodiment has flexibility by making plate | board thickness dimension small enough, As a whole A substantially U-shaped cross section that opens upward is formed continuously over the entire circumference. As described above, the small-diameter cylindrical portion 18 is connected to the annular wall portion 36 via the flexible connecting portion 34, so that the small-diameter cylindrical portion 18 can be inclined with respect to the annular wall portion 36. Yes.
　かかる拡径筒部２２における連結部３４よりも外周側では、第二傾斜筒部４０の板厚寸法ｔ（図４参照）が最も小さくされており、第二傾斜筒部４０により薄肉部が構成されている。換言すれば、係止突部４４に対して小径筒部１８側で隣接する部分に薄肉部（第二傾斜筒部４０）が設けられている。一方、第二傾斜筒部４０と小径筒部１８側で隣接する第一傾斜筒部３８の最大板厚寸法Ｔ1 （図４参照）と、係止突部４４と大径筒部２０側で隣接する周壁部２８の板厚寸法Ｔ2 （図４参照）とが、それぞれ第二傾斜筒部４０の板厚寸法ｔよりも大きくされている。これによって、第一傾斜筒部３８と周壁部２８とのそれぞれにより薄肉部よりも板厚寸法が大きくされた厚肉部が構成されている。すなわち、薄肉部（第二傾斜筒部４０）に対して小径筒部１８側で隣接する部分に厚肉部（第一傾斜筒部３８）が設けられているとともに、係止突部４４に対して大径筒部２０側で隣接する部分に厚肉部（周壁部２８）が設けられている。なお、本実施形態では、環状壁部３６の板厚寸法が第二傾斜筒部４０の板厚寸法ｔよりも大きくされており、第一傾斜筒部３８は、第二傾斜筒部４０側から環状壁部３６側に向かって次第に板厚寸法が大きくなるようにされている。すなわち、第一傾斜筒部３８の最小板厚寸法が薄肉部（第二傾斜筒部４０）の板厚寸法ｔと等しくされている一方、環状壁部３６の板厚寸法が第一傾斜筒部３８の最大板厚寸法Ｔ1 と等しくされている。 The plate thickness dimension t (see FIG. 4) of the second inclined cylindrical portion 40 is the smallest on the outer peripheral side of the connecting portion 34 in the diameter-expanded cylindrical portion 22, and the thin portion is configured by the second inclined cylindrical portion 40. Has been. In other words, the thin wall portion (second inclined cylinder portion 40) is provided in a portion adjacent to the locking projection 44 on the small diameter cylinder portion 18 side. On the other hand, the maximum thickness T 1 (see FIG. 4) of the first inclined cylinder part 38 adjacent to the second inclined cylinder part 40 on the small diameter cylinder part 18 side, and the locking protrusion 44 and the large diameter cylinder part 20 side. The plate thickness dimension T 2 (see FIG. 4) of the adjacent peripheral wall portions 28 is made larger than the plate thickness dimension t of the second inclined cylinder portion 40, respectively. Thereby, the thick part by which plate | board thickness dimension was enlarged rather than the thin part by each of the 1st inclination cylinder part 38 and the surrounding wall part 28 is comprised. That is, a thick portion (first inclined cylindrical portion 38) is provided in a portion adjacent to the thin portion (second inclined cylindrical portion 40) on the small diameter cylindrical portion 18 side, and against the locking projection 44. A thick wall portion (peripheral wall portion 28) is provided in a portion adjacent to the large-diameter cylindrical portion 20 side. In the present embodiment, the plate thickness dimension of the annular wall portion 36 is larger than the plate thickness dimension t of the second inclined cylinder portion 40, and the first inclined cylinder portion 38 is from the second inclined cylinder portion 40 side. The plate thickness dimension is gradually increased toward the annular wall portion 36 side. That is, the minimum plate thickness dimension of the first inclined cylinder portion 38 is made equal to the plate thickness dimension t of the thin wall portion (second inclined cylinder portion 40), while the plate thickness dimension of the annular wall portion 36 is the first inclined cylinder portion. The maximum plate thickness dimension T 1 is 38.
　ここにおいて、両厚肉部（第一傾斜筒部３８および周壁部２８）の内面４８，５０は、補強部５２によって接続されている。具体的には、第一傾斜筒部３８の内面４８から周壁部２８の内面５０の上端部分にかけて、薄板状（リブ状）の補強部５２が設けられており、すなわち、環状壁部３６の内面の外周端部と周壁部２８の上端部分とが補強部５２により接続されている。かかる補強部５２は、屈曲部分４２の板厚方向内方において略三角形状の断面をもって設けられており、補強部５２の内面５４が、例えば図５に示すグロメット１０の縦断面において、グロメット１０の中心軸方向に対して傾斜して直線状に延びている。なお、本実施形態では、６つの補強部５２が周方向で略等間隔に設けられている。かかる補強部は、例えば周方向の全周に亘って連続して設けることも可能であるが、周方向で部分的に設けることにより、グロメットの軽量化とコストダウンが図られ得る。また、周方向で略等間隔に設けることにより、変形時における局所的な応力や歪の集中が回避されて、耐久性の向上が図られ得る。 Here, the inner surfaces 48, 50 of both thick parts (the first inclined cylinder part 38 and the peripheral wall part 28) are connected by a reinforcing part 52. Specifically, a thin plate-like (rib-like) reinforcing portion 52 is provided from the inner surface 48 of the first inclined cylinder portion 38 to the upper end portion of the inner surface 50 of the peripheral wall portion 28, that is, the inner surface of the annular wall portion 36. The outer peripheral end portion of the peripheral wall portion and the upper end portion of the peripheral wall portion 28 are connected by a reinforcing portion 52. The reinforcing portion 52 is provided with a substantially triangular cross section in the thickness direction inward of the bent portion 42, and the inner surface 54 of the reinforcing portion 52 is, for example, in the longitudinal cross section of the grommet 10 shown in FIG. It is inclined with respect to the central axis direction and extends linearly. In the present embodiment, six reinforcing portions 52 are provided at substantially equal intervals in the circumferential direction. Such a reinforcing portion can be provided continuously over the entire circumference in the circumferential direction, for example, but by providing it partially in the circumferential direction, the weight of the grommet can be reduced and the cost can be reduced. Further, by providing at substantially equal intervals in the circumferential direction, concentration of local stress and strain during deformation can be avoided and durability can be improved.
　なお、以上の如き構造とされたグロメット１０は、例えばＥＰＤＭ（エチレンプロピレンゴム）、ＣＲ（クロロプレンゴム）、ＳＩ（シリコンゴム）などのゴム材料によって一体的に形成されることが好適である。 In addition, it is preferable that the grommet 10 having the above structure is integrally formed of a rubber material such as EPDM (ethylene propylene rubber), CR (chloroprene rubber), SI (silicone rubber).
　ここで、かかるグロメット１０の小径筒部１８にはワイヤハーネス１６が挿通されて、小径筒部１８の軸方向両端におけるテープ止めリブ２４，２４においてテープ固定を行うことで、ワイヤハーネス１６にグロメット１０が固定される。そして、グロメット１０がワイヤハーネス１６に外装固定された状態でグロメット１０を車体パネル１２の貫通孔１４に挿入することにより、環状凹溝４６に貫通孔１４の開口周縁部が嵌め入れられて係止突部４４とフランジ部３０との軸方向間で挟持される。これにより、グロメット１０が車体パネル１２に装着されて、貫通孔１４を通じて車体パネル１２にワイヤハーネス１６が挿通される。 Here, the wire harness 16 is inserted into the small diameter cylindrical portion 18 of the grommet 10, and tape fixing ribs 24 and 24 at both axial ends of the small diameter cylindrical portion 18 are fixed to the grommet 10. Is fixed. Then, by inserting the grommet 10 into the through hole 14 of the vehicle body panel 12 with the grommet 10 being externally fixed to the wire harness 16, the opening peripheral edge of the through hole 14 is fitted into the annular groove 46 and locked. It is clamped between the axial direction of the protrusion 44 and the flange part 30. Thereby, the grommet 10 is attached to the vehicle body panel 12, and the wire harness 16 is inserted into the vehicle body panel 12 through the through hole 14.
　なお、係止突部４４とフランジ部３０の上面との軸方向間距離は、車体パネル１２の板厚寸法と略等しいか僅かに小さくされており、係止突部４４とフランジ部３０との間で車体パネル１２を挟持することにより、フランジ部３０の上面に設けられた弾性突起３２，３２が圧縮変形させられて貫通孔１４の開口周縁部とフランジ部３０の上面とが密着することから、車体パネル１２の貫通孔１４を通じた水の浸入が防止され得る。 The axial distance between the locking projection 44 and the upper surface of the flange portion 30 is substantially equal to or slightly smaller than the plate thickness dimension of the vehicle body panel 12. By sandwiching the vehicle body panel 12 therebetween, the elastic protrusions 32, 32 provided on the upper surface of the flange portion 30 are compressed and deformed, and the opening peripheral portion of the through hole 14 and the upper surface of the flange portion 30 are in close contact with each other. Intrusion of water through the through hole 14 of the vehicle body panel 12 can be prevented.
　かかるグロメット１０の、車体パネル１２の貫通孔１４の挿入に際しては、図６に示されるように、ワイヤハーネス１６と共に小径筒部１８を上方へ引っ張ることにより、グロメット１０が、係止突部４４が設けられている部分において縮径変形させられて、係止突部４４における外径寸法が貫通孔１４の内径寸法よりも小さくなることで、グロメット１０の貫通孔１４への挿入が可能とされる。 When inserting the through hole 14 of the vehicle body panel 12 of the grommet 10, as shown in FIG. 6, by pulling the small diameter cylindrical portion 18 together with the wire harness 16, the grommet 10 is engaged with the locking projection 44. The outer diameter dimension of the locking projection 44 is smaller than the inner diameter dimension of the through hole 14 by being reduced in diameter at the provided portion, so that the grommet 10 can be inserted into the through hole 14. .
　すなわち、小径筒部１８が上方へ引っ張られることにより、小径筒部１８と連結されている拡径筒部２２が上方および内周方向へ伸びるように変形する。この際、拡径筒部２２には、薄肉部（第二傾斜筒部４０）が設けられていることから、薄肉部に対して上方および内周方向への引張力が優先的に及ぼされる。このように、第二傾斜筒部４０が上方および内周方向へ引っ張られることにより、第二傾斜筒部４０に隣接する係止突部４４にも同方向の引張力が及ぼされて、係止突部４４が効果的に内周側へ変位させられるようになっている。 That is, when the small diameter cylindrical portion 18 is pulled upward, the enlarged diameter cylindrical portion 22 connected to the small diameter cylindrical portion 18 is deformed so as to extend upward and in the inner circumferential direction. At this time, since the thinned portion (second inclined tubular portion 40) is provided in the enlarged diameter cylindrical portion 22, a tensile force in the upward and inner circumferential directions is preferentially exerted on the thinned portion. As described above, when the second inclined cylinder portion 40 is pulled upward and in the inner circumferential direction, a tensile force in the same direction is exerted on the locking protrusion 44 adjacent to the second inclined cylinder portion 40, and the locking is performed. The protrusion 44 is effectively displaced toward the inner peripheral side.
　それに加えて、第二傾斜筒部４０に対して小径筒部１８側で隣接する部分と係止突部４４に対して大径筒部２０側で隣接する部分（第一傾斜筒部３８および周壁部２８）の内面４８，５０が補強部５２で接続されていることから、第一傾斜筒部３８に対する引張力が内周側から周壁部２８にも伝達されて、周壁部２８にも内周方向へ引っ張られる力が及ぼされる。それ故、周壁部２８に隣接する係止突部４４が内周側へ一層変位させられ易くなっている。特に、第一傾斜筒部３８および周壁部２８は、薄肉部（第二傾斜筒部４０）よりも厚肉とされていることから、第一傾斜筒部３８や周壁部２８が比較的変形し難くされており、第一傾斜筒部３８に及ぼされた引張力が安定して周壁部２８に伝達されるようになっている。 In addition, a portion adjacent to the second inclined cylindrical portion 40 on the small diameter cylindrical portion 18 side and a portion adjacent to the locking projection 44 on the large diameter cylindrical portion 20 side (the first inclined cylindrical portion 38 and the peripheral wall). Since the inner surfaces 48, 50 of the portion 28) are connected by the reinforcing portion 52, the tensile force applied to the first inclined cylinder portion 38 is transmitted from the inner peripheral side to the peripheral wall portion 28, so that the peripheral wall portion 28 also has an inner periphery. A force that is pulled in the direction is exerted. Therefore, the locking projection 44 adjacent to the peripheral wall 28 is more easily displaced toward the inner peripheral side. In particular, since the first inclined cylinder part 38 and the peripheral wall part 28 are made thicker than the thin part (second inclined cylinder part 40), the first inclined cylinder part 38 and the peripheral wall part 28 are relatively deformed. The tensile force exerted on the first inclined cylinder portion 38 is stably transmitted to the peripheral wall portion 28.
　かかるグロメット１０の、車体パネル１２の貫通孔１４への挿入性の向上は、係止突部４４や大径筒部２０の板厚寸法を小さくしたりするものではないことから、グロメット１０による車体パネル１２の保持力を低減させるものではない。それ故、車体パネル１２の保持力を損なうことなく、車体パネル１２への挿入性の向上が図られ得る。また、車体パネル１２の保持力を確保しつつ、拡径筒部２２に薄肉部を設けることから、グロメット１０の軽量化やコストダウンが図られ得る。 The improvement of the insertability of the grommet 10 into the through hole 14 of the vehicle body panel 12 does not reduce the plate thickness of the locking projection 44 or the large-diameter cylindrical portion 20. The holding force of the panel 12 is not reduced. Therefore, the insertability into the vehicle body panel 12 can be improved without impairing the holding force of the vehicle body panel 12. Further, since the thinned portion is provided in the enlarged diameter cylindrical portion 22 while securing the holding force of the vehicle body panel 12, the grommet 10 can be reduced in weight and cost can be reduced.
　また、本実施形態では、補強部５２が周方向で略等間隔に設けられていることから、上記の如きグロメット１０の変形に際して、局所的な応力や歪の集中が回避されて、耐久性の向上が図られ得る。また、補強部５２の内面５４が、グロメット１０の縦断面において、両厚肉部（第一傾斜筒部３８および周壁部２８）の内面４８，５０を接続して直線状に延びていることから、補強部５２によるグロメット１０の内方への突出が小さく抑えられる。それ故、上記の如きグロメット１０の変形の際にも、補強部５２同士が当接して変形が阻害されるおそれが低減されるだけでなく、後述するように、グロメット１０の中心軸方向（上下方向）に対してワイヤハーネス１６が傾斜して挿通される際にも、補強部５２とワイヤハーネス１６が当接してワイヤハーネス１６の配索の妨げになることが回避され得る。 In the present embodiment, since the reinforcing portions 52 are provided at substantially equal intervals in the circumferential direction, when the grommet 10 is deformed as described above, concentration of local stress and strain is avoided, and durability is improved. Improvement can be achieved. Further, the inner surface 54 of the reinforcing portion 52 extends in a straight line by connecting the inner surfaces 48 and 50 of both thick portions (the first inclined cylinder portion 38 and the peripheral wall portion 28) in the longitudinal section of the grommet 10. Further, the inward protrusion of the grommet 10 by the reinforcing portion 52 is suppressed to be small. Therefore, when the grommet 10 is deformed as described above, not only the possibility that the reinforcing portions 52 come into contact with each other and the deformation is hindered is reduced. Even when the wire harness 16 is inserted with an inclination with respect to (direction), it can be avoided that the reinforcing portion 52 and the wire harness 16 come into contact with each other and obstruct the wiring of the wire harness 16.
　さらに、小径筒部１８が可撓性を有する連結部３４により環状壁部３６に連結されていることから、図７に示されているように、小径筒部１８の中心軸方向が拡径筒部２２に対して任意に調節可能とされている。それ故、車体パネルに対してワイヤハーネスが傾斜して配索される場合にも、当該傾斜方向に合わせて小径筒部を拡径筒部に対して傾斜させたグロメットを別途製造する必要はなく、本実施形態のグロメット１０が汎用的に使用され得る。 Further, since the small diameter cylindrical portion 18 is connected to the annular wall portion 36 by a flexible connecting portion 34, as shown in FIG. 7, the central axis direction of the small diameter cylindrical portion 18 is the expanded diameter cylinder. The portion 22 can be arbitrarily adjusted. Therefore, even when the wire harness is inclined and wired with respect to the vehicle body panel, it is not necessary to separately manufacture a grommet in which the small diameter cylindrical portion is inclined with respect to the enlarged diameter cylindrical portion in accordance with the inclination direction. The grommet 10 of this embodiment can be used for general purposes.
　以上、本発明の実施形態について説明してきたが、本発明はかかる実施形態における具体的な記載によって限定的に解釈されるものでなく、当業者の知識に基づいて種々なる変更、修正、改良などを加えた態様で実施可能である。 Although the embodiments of the present invention have been described above, the present invention is not limited to the specific descriptions in the embodiments, and various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It is feasible in the form which added.
　たとえば、前記実施形態では、拡径筒部２２に第一傾斜筒部３８と第二傾斜筒部４０が設けられて、第二傾斜筒部４０が薄肉部とされると共に、第二傾斜筒部４０と隣接する第一傾斜筒部３８および係止突部４４と隣接する周壁部２８が厚肉部とされていたが、かかる態様に限定されるものではない。すなわち、前記実施形態において、第一傾斜筒部３８および第二傾斜筒部４０を一つの薄肉部とみなす場合には、当該薄肉部と小径筒部１８側で隣接する環状壁部３６が厚肉部として把握され得る。あるいは、第二傾斜筒部４０を薄肉部として、環状壁部３６および第一傾斜筒部３８を小径筒部１８側の厚肉部として把握することも可能である。かかる何れの場合においても、小径筒部１８側の厚肉部と大径筒部２０側の厚肉部（周壁部２８）の内面５０とが補強部５２により接続される。 For example, in the said embodiment, the 1st inclination cylinder part 38 and the 2nd inclination cylinder part 40 are provided in the diameter expansion cylinder part 22, and while the 2nd inclination cylinder part 40 is made into a thin part, the 2nd inclination cylinder part Although the first inclined cylinder portion 38 adjacent to 40 and the peripheral wall portion 28 adjacent to the locking projection 44 are thick-walled portions, the present invention is not limited to this mode. That is, in the said embodiment, when the 1st inclination cylinder part 38 and the 2nd inclination cylinder part 40 are regarded as one thin part, the annular wall part 36 adjacent by the said thin part and the small diameter cylinder part 18 side is thick. It can be grasped as a part. Or it is also possible to grasp | ascertain the annular wall part 36 and the 1st inclination cylinder part 38 as a thick part by the side of the small diameter cylinder part 18 by making the 2nd inclination cylinder part 40 into a thin part. In any of these cases, the thick portion on the small diameter cylindrical portion 18 side and the inner surface 50 of the thick portion (the peripheral wall portion 28) on the large diameter cylindrical portion 20 side are connected by the reinforcing portion 52.
　また、前記実施形態では、拡径筒部２２において、傾斜角度の異なる第一傾斜筒部３８と第二傾斜筒部４０とが屈曲部分４２で接続されていたが、かかる屈曲部分は必須なものではなく、例えば図８に示されるグロメット５６のように、単一の傾斜角度を有する傾斜筒部５８をもって環状壁部３６と大径筒部２０とが接続されていてもよい。本態様においては、係止突部４４に小径筒部１８側で隣接する部分である傾斜筒部５８が薄肉部とされる一方、当該薄肉部に対して小径筒部１８側で隣接する部分である環状壁部３６と係止突部４４に対して大径筒部２０側で隣接する部分である周壁部２８が厚肉部とされる。そして、両厚肉部３６，２８のそれぞれの内面６０，５０が補強部６２により接続されて、当該補強部６２の内面６４は、図８に示される縦断面のように、直線状に延びることが好ましい。さらに、本発明に係るグロメットでは、所定の径方向寸法をもって広がる環状壁部も必須なものではなく、例えば連結部の外周端から大径筒部までが、滑らかな湾曲形状をもって接続されていてもよい。 Moreover, in the said embodiment, although the 1st inclination cylinder part 38 and the 2nd inclination cylinder part 40 from which inclination angles differ in the diameter expansion cylinder part 22 were connected by the bending part 42, this bending part is essential. Instead, for example, like the grommet 56 shown in FIG. 8, the annular wall portion 36 and the large-diameter cylindrical portion 20 may be connected with an inclined cylindrical portion 58 having a single inclination angle. In this embodiment, the inclined cylindrical portion 58 that is a portion adjacent to the locking projection 44 on the small diameter cylindrical portion 18 side is a thin portion, while the thin portion is adjacent to the thin diameter portion on the small diameter cylindrical portion 18 side. The peripheral wall portion 28 that is a portion adjacent to the annular wall portion 36 and the locking projection 44 on the large-diameter cylindrical portion 20 side is a thick portion. And each inner surface 60 and 50 of both the thick parts 36 and 28 is connected by the reinforcement part 62, and the inner surface 64 of the said reinforcement part 62 is extended linearly like the longitudinal cross-section shown by FIG. Is preferred. Furthermore, in the grommet according to the present invention, an annular wall portion that expands with a predetermined radial dimension is not essential. For example, even from the outer peripheral end of the connecting portion to the large-diameter cylindrical portion is connected with a smooth curved shape. Good.
　更にまた、補強部の形状や、大きさ、個数などは何等限定されるものではなく、グロメットの材質や拡径筒部の形状などにより設計、変更され得る。前記実施形態では、補強部５２がリブ状（薄板状）とされて、６つの補強部５２が周方向で等間隔に配置されていたが、例えば周方向の全周に亘って連続して延びて形成されるなど、何等形状が限定されるものではない。なお、補強部は、両厚肉部の内面を接続していればよく、薄肉部の内面とは接続されていなくてもよい。 Furthermore, the shape, size, number, and the like of the reinforcing portion are not limited in any way, and can be designed and changed depending on the material of the grommet and the shape of the expanded cylindrical portion. In the above-described embodiment, the reinforcing portions 52 have a rib shape (thin plate shape), and the six reinforcing portions 52 are arranged at equal intervals in the circumferential direction. For example, the reinforcing portions 52 continuously extend over the entire circumference in the circumferential direction. The shape is not limited, such as being formed. In addition, the reinforcement part should just connect the inner surface of both thick parts, and does not need to be connected with the inner surface of a thin part.
　また、小径筒部の形状は何等限定されるものではない。すなわち、前記実施形態の如く、小径筒部１８が、拡径筒部２２の小径側の端部および大径筒部２０から軸方向外方へ突出していてもよいし、前記特許文献１のグロメットのように小径筒部が軸方向で分割されたような形状とされてもよい。なお、前記特許文献１に記載のグロメットのように、小径筒部が軸方向で分割されたような形状とされた場合、下方の小径筒部は必須なものではない。 Also, the shape of the small diameter cylindrical portion is not limited at all. That is, as in the above-described embodiment, the small-diameter cylindrical portion 18 may protrude outward in the axial direction from the end on the small-diameter side of the large-diameter cylindrical portion 22 and the large-diameter cylindrical portion 20, or the grommet described in Patent Document 1. In this way, the small-diameter cylindrical portion may have a shape that is divided in the axial direction. In addition, when it is set as the shape where the small diameter cylinder part was divided | segmented by the axial direction like the grommet of the said patent document 1, a lower small diameter cylinder part is not essential.
　さらに、前記実施形態では、連結部３４は全体が略Ｕ字状断面を有するように形成されていたが、連結部の形状は限定されるものではない。すなわち、例えば、全体の断面形状が略Ｗ字状や蛇腹形状とされてもよいし、直線状とされてもよい。さらに、連結部が上方に向かって延びて、例えば連結部と小径筒部とが環状壁部よりも上方で接続されていてもよい。尤も、本発明のグロメットにおいて、可撓性を有する連結部は必須なものではなく、環状壁部が小径筒部の外周面に直接接続されてもよい。 Furthermore, in the said embodiment, although the connection part 34 was formed so that the whole had a substantially U-shaped cross section, the shape of a connection part is not limited. That is, for example, the overall cross-sectional shape may be substantially W-shaped or bellows-shaped, or may be linear. Further, the connecting portion may extend upward, and for example, the connecting portion and the small diameter cylindrical portion may be connected above the annular wall portion. However, in the grommet of the present invention, a flexible connecting portion is not essential, and the annular wall portion may be directly connected to the outer peripheral surface of the small diameter cylindrical portion.
１０，５６：グロメット、１２：車体パネル、１８：小径筒部、２０：大径筒部、２２：拡径筒部、２８：周壁部（厚肉部）、３４：連結部、３８：第一傾斜筒部（厚肉部）、４０：第二傾斜筒部（薄肉部）、４４：係止突部、４８，５０，６０：内面、５２，６２：補強部、５４，６４：内面、５８：傾斜筒部（薄肉部） 10, 56: Grommet, 12: Body panel, 18: Small-diameter cylindrical part, 20: Large-diameter cylindrical part, 22: Large-diameter cylindrical part, 28: Peripheral wall part (thick part), 34: Connection part, 38: First Inclined cylindrical part (thick part), 40: second inclined cylindrical part (thin part), 44: locking projection, 48, 50, 60: inner surface, 52, 62: reinforcing part, 54, 64: inner surface, 58 : Inclined tube (thin wall)

Claims (5)

  1. 　相互に離隔する大径筒部と小径筒部とが拡径筒部で接続されていると共に、該拡径筒部における前記大径筒部側の端部には外周側に突出する係止突部が設けられており、該係止突部と前記大径筒部とで車体パネルを挟み込むことで該車体パネルに装着されるようになっているグロメットにおいて、
    　前記拡径筒部における前記係止突部に対して前記小径筒部側で隣接する部分が、肉厚寸法が小さくされた薄肉部とされている一方、
    　該薄肉部に対して前記小径筒部側で隣接する部分と前記係止突部に対して前記大径筒部側で隣接する部分が、それぞれ前記薄肉部よりも肉厚寸法が大きくされた厚肉部とされており、これら両厚肉部の内面が補強部により相互に接続されていることを特徴とするグロメット。     A large-diameter cylindrical portion and a small-diameter cylindrical portion that are separated from each other are connected by an enlarged-diameter cylindrical portion, and a locking projection that protrudes to the outer peripheral side at the end of the enlarged-diameter cylindrical portion on the large-diameter cylindrical portion side In the grommet that is provided to the vehicle body panel by sandwiching the vehicle body panel between the locking projection and the large-diameter cylindrical portion,
    While the portion adjacent on the small-diameter cylindrical portion side to the locking projection in the large-diameter cylindrical portion is a thin-walled portion with a reduced thickness,
    The thickness adjacent to the thin-walled portion on the small-diameter cylindrical portion side and the portion adjacent to the locking projection on the large-diameter cylindrical portion side are thicker than the thin-walled portion. A grommet characterized in that it is a flesh portion, and the inner surfaces of both thick portions are connected to each other by a reinforcing portion.
  2. 　前記補強部が周方向で複数設けられている請求項１に記載のグロメット。 The grommet according to claim 1, wherein a plurality of the reinforcing portions are provided in the circumferential direction.
  3. 　前記複数の補強部が周方向で等間隔に設けられている請求項２に記載のグロメット。 The grommet according to claim 2, wherein the plurality of reinforcing portions are provided at equal intervals in the circumferential direction.
  4. 　縦断面において、前記補強部の内面が直線状に延びている請求項１～３の何れか１項に記載のグロメット。 The grommet according to any one of claims 1 to 3, wherein an inner surface of the reinforcing portion extends linearly in a longitudinal section.
  5. 　前記拡径筒部の前記小径筒部側の端部には、該小径筒部に連結される連結部が設けられており、該連結部が可撓性を有することで、前記小径筒部が前記拡径筒部に対して傾斜自在とされている請求項１～４の何れか１項に記載のグロメット。 A connecting portion connected to the small-diameter cylindrical portion is provided at an end of the large-diameter cylindrical portion on the small-diameter cylindrical portion side, and the connecting portion is flexible so that the small-diameter cylindrical portion is The grommet according to any one of claims 1 to 4, wherein the grommet is tiltable with respect to the enlarged diameter cylindrical portion.
PCT/JP2017/000358 2016-01-21 2017-01-09 Grommet WO2017126351A1 (en)

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JP2021027689A (en) * 2019-08-05 2021-02-22 本田技研工業株式会社 Grommet

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JP7104014B2 (en) * 2019-12-05 2022-07-20 矢崎総業株式会社 Grommet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002171647A (en) * 2000-09-22 2002-06-14 Sumitomo Wiring Syst Ltd Grommet
JP2009225509A (en) * 2008-03-13 2009-10-01 Sumitomo Wiring Syst Ltd Grommet

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002171647A (en) * 2000-09-22 2002-06-14 Sumitomo Wiring Syst Ltd Grommet
JP2009225509A (en) * 2008-03-13 2009-10-01 Sumitomo Wiring Syst Ltd Grommet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021027689A (en) * 2019-08-05 2021-02-22 本田技研工業株式会社 Grommet
JP7076412B2 (en) 2019-08-05 2022-05-27 本田技研工業株式会社 Grommet

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