JP5761165B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet, and more specifically, in a grommet that is externally fitted to a wire harness routed in a vehicle and is locked to a through hole provided in a vehicle body panel. The present invention relates to a grommet that can be attached without reducing the size of the hole.

  Conventionally, as shown in FIG. 8A, a door wire harness 110 (hereinafter referred to as a door harness) routed inside a side door 100 of an automobile has a through hole 112 provided in an end surface 111a of the door panel 111. The wire harness is pulled out from the vehicle body panel 120 and extended to the vehicle body panel 120, and is connected to a wire harness routed to the vehicle compartment side through a through hole 121 provided in the vehicle body panel 120. A grommet 200 is attached to a door harness at a portion that passes between the door and the vehicle body through the through hole 112 on the door side and passes through the through hole 121 on the vehicle body side, and a seal lip 200 a provided on the grommet 200 at the periphery of the through holes 112 and 121. To prevent water from entering the door and the vehicle body.

  As shown in FIG. 8 (B), the door panel 111 is formed by joining the peripheral edges of the outer panel 111b and the inner panel 111c with an accommodating space inside, routing the door harness 110 in the space, It is connected with the electrical equipment equipped with.

  An end surface 111a (a side end surface facing the vehicle body panel) of the door panel provided with a through hole 112 through which the door harness 110 is drawn joins the periphery of the bent portion 111d of the inner panel 111c to the periphery of the outer panel 111b. The bent portion 111d serves as the front end surface 111a of the door panel in which the through hole 112 is formed. When it is required to reduce the width of the door panel in order to widen the space in the vehicle interior, the width S of the front end surface 111a of the door panel in which the through hole 112 is provided is reduced, and the through hole 112 formed in the front end surface 111a is reduced. I have to.

  When the width of the panel in which the through hole is provided is narrow as described above, as shown in FIG. 9A, the oval through hole 112 is formed such that the vertical and vertical dimensions are larger than the horizontal and horizontal dimensions. . When this through hole 112 is a long hole, as shown in FIG. 9B, the grommet 200 is also an oval grommet. (See JP-A-9-320370, JP-A-2006-123572, etc.)

  However, in the oval grommet, the grommet locking force decreases on the long side in the vertical direction, which is linear, and the pulling force is applied to the grommet 200 via the wire harness 110 as shown in FIG. As a result, the grommet 200 is easily detached from the through hole 112. Therefore, it is necessary to secure a sufficient dimension for the seal lip 200a provided at the tip of the locking portion 210 of the grommet 200 to be caught on the periphery of the through hole 112 of the panel. It is not possible to secure a sufficient lip catching area.

  In this way, when a large hole cannot be drilled as a through hole for attaching the grommet, and it must be a small through hole, as shown in FIG. The connectors 310 and 320 are connected to the wires of the wire harness. However, if one large connector is divided into a plurality of small connectors such as two, there is a problem that the component cost and the work cost increase.

JP 9-320370 A JP 2006-123572 A

  The present invention has been made in view of the above problems, and it is not necessary to divide a large connector into a plurality of small connectors, which causes an increase in cost, and a through-hole having a size capable of inserting the large connector is provided in a narrow-width panel. However, it is an object of the present invention to provide a grommet that can sufficiently secure the catching dimension of the locking portion of the grommet and can secure the mounting strength of the grommet.

In order to solve the above problems, the present invention is a grommet that is molded from rubber or elastomer, is externally fitted to a wire harness, and is attached to a through hole formed in a panel that is a mounting material.
A large-diameter cylindrical portion provided with an annular locking recess to be fitted to the periphery of the through-hole, and provided with a thick locking portion by projecting the side wall sandwiching the bottom surface of the locking recess outward, The locking portion is provided with a rounded portion on the protruding side of the panel locking surface that is continuous with the side wall of the locking recess, and is continuous with the outer peripheral surface of the locking portion main body having the maximum diameter through the rounded portion, and the panel A seal lip that presses against the panel at the periphery of the through hole is protruded at the outer end position until reaching the rounded portion of the locking surface,
The rounded portion of the locking portion and the outer peripheral surface of the locking portion main body are dimensioned so as to be in close contact with the inner peripheral surface of the rounded portion of the panel and the inner surface of the flat portion continuous to the inner peripheral surface of the rounded portion. To provide grommets.

As described above, in the grommet of the present invention, the position of the seal lip provided on the panel locking surface is shorter from the bottom surface of the locking recess to be fitted into the through hole of the panel, but the outer end position of the seal lip Therefore, the outer peripheral surfaces of the rounded portion and the locking portion main body are brought into close contact with the panel, and the hooking size of the grommet on the panel is increased.
Therefore, the part where the through hole of the panel is provided is narrow, the dimension of the flat part continuous to the periphery of the through hole is small, the dimension of the panel locking surface of the locking part of the grommet cannot be set long, and the position where the seal lip is pressed Even when the required dimension is not separated from the through hole, the outer radius portion and the outer peripheral surface can be pressed against the inner surface of the panel from the position of the seal lip to function as a hook portion. As a result, even if a pulling force acts on the grommet via the wire harness, the locking portion does not easily come off from the peripheral edge of the through hole of the panel, and it is possible to ensure the strength of attaching the grommet to the panel.

  When the grommet of the present invention is attached to the oval through hole formed in the bent and narrowed portion of the panel, the large-diameter cylindrical portion has both sides in the width direction as straight sides. It has a long cylindrical shape. That is, the outer peripheral surface of the locking portion main body and the rounded portion of the locking portion main body of at least one of the pair of parallel straight sides of the large diameter cylindrical portion are the inner peripheral surface of the bent round portion of the panel And it is set as the structure closely_contact | adhered to the inner surface of the flat part which continues to this round part.

  In addition, when a circular through hole is provided in a narrow portion of the panel, the large-diameter cylindrical portion of the grommet is formed into a circular shape, the round portion is provided with the rounded portion and the outer peripheral portion, and the seal You may project a lip.

  When the grommet of the present invention is attached to a wire harness that extends from a side door or a back door of an automobile to a vehicle body, the large-diameter cylindrical portion that is attached to a through hole formed in a bent portion of the peripheral edge of the door inner panel has a bellows shape. A small-diameter cylindrical portion is provided continuously, and a large-diameter cylindrical portion is provided at the other end of the small-diameter cylindrical portion to be attached to a through hole formed in the vehicle body.

  Note that the grommet is not limited to a grommet that is externally mounted on a wire harness that spans between a door and a vehicle body of an automobile, and can be suitably used for mounting in a through hole provided in a narrow panel.

  As described above, according to the present invention, when the panel width of the portion provided with the through hole for passing the grommet is small and a large through hole is provided, a large area cannot be taken at the periphery of the through hole, and the locking portion of the grommet When the hooking length of the grommet is shortened, a rounded portion closely contacting the bent inner surface of the panel is provided at the tip of the panel locking surface of the locking portion of the grommet, and the outer peripheral surface of the main body having the maximum outer diameter continuous to the rounded portion The panel locking surface is not provided with a seal lip portion at the tip including the rounded portion, but a seal lip portion is provided at an outer position of the panel locking surface until reaching the rounded portion. Yes. The seal lip is in close contact with the periphery of the through hole of the panel, the rounded portion outside the seal lip is in close contact with the inner surface of the bent portion of the panel, and the outer peripheral surface continuous to the rounded portion is in the flat portion of the panel. Pressed against the circumference. That is, even if the dimension from the bottom surface of the locking recess to be tightly attached to the through hole of the panel to the seal lip is short, the outer radius part of the seal lip and the outer peripheral surface of the main body part are brought into close contact with the panel and function as a hooking part. As a result, it is possible to increase the attachment strength of the grommet and prevent the grommet from being detached from the through hole even when a tensile force is applied.

1 is a schematic cross-sectional view showing a state in which a grommet according to an embodiment of the present invention is mounted on a door harness and spanned between an automobile door and a vehicle body. The front view which shows the front end surface which provided the through-hole of the door panel, (B) is drawing explaining the dimensional relationship of the through-hole provided in the door panel. It is a front view of the grommet which inserted the door harness. The main part of a grommet is shown, (A) is sectional drawing of the large diameter cylinder part used as a door side latching | locking part, (B) is BB sectional drawing of (A), (C) protruded the seal lip. It is an expanded sectional view of a locking part. (A) is a drawing showing the relationship between the locking portion of the grommet and the bent portion of the panel, and (B) is a seal lip and rounded portion of the locking portion of the grommet where the locking recess of the grommet is fitted into the through hole of the panel It is sectional drawing which shows the state by which a main body outer peripheral surface is pressed on a panel. It is sectional drawing which shows the state which has mounted | wore the grommet attached to the door harness in the through-hole of the panel. It is drawing which shows the modification of a grommet. A conventional example is shown, (A) is a sectional view showing a state in which a grommet is attached to a door harness that spans between a vehicle body and a door, and (B) shows a state in which the grommet is attached to a through hole on the door side. It is sectional drawing shown. (A) is drawing which shows the through-hole provided in a door panel, (B) is the schematic of the grommet attached to the through-hole of (A), (C) is sectional drawing of the state which has installed the grommet in the through-hole. . It is drawing which shows the problem of a prior art example.

Hereinafter, embodiments of the grommet of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the grommet 1 of the embodiment shown in FIGS. 1 to 6 is pulled out from a through hole 3 provided in a front end surface 2f of a door panel 2 of a side door of an automobile, and is laid between the side door and the vehicle body. It is a grommet that is attached to a door wire harness 6 (hereinafter referred to as a door harness 6) that is routed and routed to the vehicle body through a through hole 5 provided in the vehicle body panel 4.

  The door harness 6 connects a relatively large single connector 30 to the body lead-out side terminal of the trunk line 6a, branches a plurality of branch lines 6b from the trunk line 6a routed inside the door, and these branch line terminals. The connector C connected to is connected to an electrical component housed inside the door. The vehicle body drawer side including the connector 30 of the door harness 6 is inserted and attached to the grommet 1 of the present invention.

  The grommet 1 is a molded product made of rubber or elastomer, and as shown in FIGS. 1 and 3, is attached to the large-diameter cylindrical portion 10 for locking the door and the through hole 5 on the vehicle body side. The large-diameter cylindrical portion 11 for locking the vehicle body is connected by a bellows-shaped small-diameter cylindrical portion 12. In addition, tape-wrapping tongue pieces 8 and 9 are projected from the tips of the large-diameter cylindrical portions 10 and 11, and after the door harness 6 is inserted into the grommet 1, the adhesive tape T is wound around the tape-wrapping tongue pieces 8 and 9. The grommet 1 can be fixed to the door harness 6.

  As shown in FIG. 2, the door panel 2 is formed by joining the outer panel 2a and the edges of the inner panel 2b whose peripheral edges are bent, and the front end surface 2f provided with the through hole 3 of the door harness 6 is formed on the inner panel 2b. It is a bent part. The width S of the door panel 2 tends to be reduced in order to expand the passenger compartment space. Specifically, for example, as shown in FIG. 2B, the width dimension S of the front end face 2f of the door panel in which the through hole 3 is provided is 64 mm, and a radius portion 2r1 having a diameter of 5 mm is provided at a portion bent from the flat portion 2e to the front end face 2f at one end in the width direction, and a diameter of 5 mm is provided at a portion bent from the front end face 2f to the joint portion 2g with the outer panel. The round portion 2r2 is provided. Therefore, the width dimension Sa of the flat surface of the front end face 2f provided with the through hole 3 is 59 mm.

  As shown in FIG. 2 (A), the through hole 3 provided in the front end surface 2f of the door panel 2 has an elliptical shape having a short width direction (lateral direction) dimension 3s and a long vertical dimension in the vertical direction. Yes. The short width direction dimension 3 s of the through hole 3 is set to a large dimension of 53 mm within a settable range, and reaches both end rounded portions 2 r 1 and 2 r 2 of the door panel front end surface 2 f from both end sides 3 a and 3 b in the width direction of the through hole 3. The dimensions of the flat surface up to this point (that is, the catching dimensions of the locking hooks) are 3 mm each, and 3 mm from the edge in the width direction of the through-hole 3 is a flat surface, and when it exceeds 3 mm, the radius is reached. As described above, the catching dimension of the locking collar portion is shorter than the size of the through hole 3.

  The grommet 1 has a large-diameter cylindrical portion 10 for locking the doors and a large-diameter cylindrical portion 11 for locking the vehicle body in the oval through holes 3 and 5 shown in FIG. As shown in the figure, the whole is formed in a vertically long oblong cylindrical shape, and is continuously provided via the small-diameter cylindrical portion 12 having a circular cross section and a thin wall. The large-diameter cylindrical portion 10 for locking the door has a thick oval base conical cylindrical portion 15 connected to one end of the small-diameter cylindrical portion 12, and an annular locking recess 16 is provided in the base conical cylindrical portion 15. A thick-walled locking portion 17 having a diameter increased through the space is continuously provided. The locking recess 16 is set to be fitted to the periphery of the through hole 3.

  4C, the panel locking surface 17a of the locking portion 17 of the large-diameter cylindrical portion 10 for locking the door projects radially from the bottom surface 16a of the locking recess 16. The other side surface 16b that is one side surface and protrudes from the bottom surface 16a is a surface that is continuous with the outer peripheral surface of the tip of the table cone tube portion 15.

  The outer surface of the locking portion 17 is continuous with the outer surface of the panel locking surface 17a that protrudes linearly in the radial direction continuously with the bottom surface 16a of the locking recess, and the rounded portion 17b is outside the maximum. It is made to continue with the outer peripheral surface 17c of the locking part main body of diameter. As shown in FIG. 4C, the width 17s1 of the panel locking surface 17a is 3 mm in the radial direction from the locking recess bottom surface 16a, the rounded portion 17b is rounded with a diameter of 5 mm, and the rounded portion 17b is the inner wall of the door panel 2. The shape is in close contact with the rounded portion 2r1 of the panel. A width 17 s 2 from the bottom surface 16 a of the locking recess to the outer peripheral surface 17 c is 5.5 mm, and the shape is in close contact with the flat portion 2 e on the inner surface of the inner panel of the door panel 2.

  As shown in FIG. 6, the grommet long cylindrical locking portion 17 has a rounded portion 17b on one side in the longitudinal direction and the outer peripheral surface 17c in close contact with the rounded portion 2r1 and the flat portion 2e of the inner panel. However, since the rounded portion 17b is rounded in the opposite direction to the rounded portion 2r2 of the inner panel on the other side in the longitudinal direction, there is no contact.

As shown in FIG. 4, the panel locking surface 17a of the grommet is between 2.5 mm from the inner end of the continuous position with the bottom surface 16a of the locking recess and 3 mm from the outer end of the linear flat surface. A seal lip 22 having a width of 0.5 mm is projected. That is, the seal lip 22 is not provided at the tip position including the rounded portion 17b, but is projected from the outer peripheral surface 17c to the inner side separated by 2.5 mm corresponding to the curvature of the rounded shape.
The seal lip 22 is provided in an oval shape that is continuous in the circumferential direction, and both sides in the long side direction and both sides in the short side direction protrude from the outer peripheral surface 17c at a distance of 2.5 mm.

  As described above, the locking portion 17 of the grommet 1 has the seal lip 22 protruding from the panel locking surface 17a located 2.5 mm inward from the outer peripheral surface 17c, and the sealing lip 22 protrudes. The shape is continuous from the position to the outer peripheral surface 17c of the main body via the rounded portion 17b.

  When the through hole 5 of the vehicle body panel 4 has the same shape as the through hole 3 on the door panel side, the shape of the locking portion on the vehicle body panel side is the same shape as the locking portion 17 on the door panel side, and the same A seal lip is provided at the position.

As shown in FIG. 3, the grommet 1 is attached by inserting the body pull-out side of the door harness 6 in which the connector 30 is connected to a plurality of wire terminals to be bundled together. At that time, the through holes 3 and 5 on the door panel side and the vehicle body panel side are made larger through holes than the door panel width, and the connector connected to the electric wire terminal on the vehicle body drawing side is a relatively large connector 30. Even if there is, it can be inserted.
After inserting the body pull-out side of the door harness 6 into the grommet 1, the adhesive tape T is wound around and secured to the electric wire group of the door harness 6 from the tape winding tongues 8 and 9.

  As described above, in the process of assembling the door harness 6 to which the grommet 1 is attached to the automobile, the door harness 6 is routed inside the side door, and then the large-diameter cylindrical portion 11 for locking the vehicle body of the grommet 1 is used as the head. The small-diameter cylindrical portion 12 is bridged between the door and the vehicle body, the large-diameter cylindrical portion 11 is inserted and locked into the through-hole 5, and the large-diameter cylindrical portion 10 for locking the door is provided. Insert and lock into the through hole 3 of the door panel.

  FIG. 6 shows a state in which the large-diameter cylindrical portion 10 for locking the door is inserted and locked in the through hole 3 of the door panel 2. The peripheral edge of the through hole 3 falls into the locking recess 16, and the annular seal lip 22 protruding from the locking part 17 is pressed against the inner surface of the front end surface 2 f of the door panel 2 at the entire peripheral edge of the through hole 3.

In addition, the rounded portion 17b of the locking portion 17 is in close contact with the rounded portion 2r1 of the front end surface 2f of the door panel 2, and the outer peripheral surface 17c of the locking portion main body having the largest diameter of the locking portion 17 is the inner panel of the door panel 2. The flat part 2e is in close contact with the inner surface. From the rounded portion 2r1 of the inner panel to the inner surface of the flat surface portion 2e, the rounded portion 17b of the locking portion 17 of the grommet and the outer peripheral surface 17c of the main body are brought into close contact to function as a hooking surface. As a result, the hooking length of the locking portion 17 of the grommet 1 to the panel can be made sufficiently long, and even if a pulling force acts on the grommet 1, the locking portion 17 is released from the panel with a slight force. Can be prevented, and the mounting strength to the panel can be sufficiently satisfied.
In addition, since the seal lip 22 projecting annularly from the locking portion 17 is in close contact with the entire periphery of the through hole, sealing performance can be ensured.

  As described above, when the grommet according to the present invention is used, even when a large through hole is provided in a narrow-width panel, it is possible to secure a sufficient area for catching the locking portion 17 of the grommet on the panel. Therefore, it is possible to maintain the mounting strength of the grommet to the panel and to increase the inner diameter of the grommet by enlarging the through hole, and to allow insertion of a large connector. It has a working effect.

  In addition, when a vertically long through hole is provided in a narrow panel and a long cylindrical grommet is attached to the through hole, the length of the hook to the panel is not limited in the vertical direction. Therefore, as shown in FIG. 7, the seal lip provided on the locking portion 17 is not provided with a sealing portion on the outer side of the panel locking surface 17a in the upper and lower short direction, and the protruding end of the panel locking surface 17a is outside the maximum. The outer peripheral surface 17c of the locking portion main body having a diameter may be bent and continuous, and a seal lip 22a may be projected from the protruding end portion of the panel locking surface 17a.

  In the above embodiment, the grommet is attached to the through-hole provided in the front end face of the narrow side door panel. However, the door panel for passing the door harness between the back door and the vehicle body under similar conditions is used. It is also suitably used as a grommet that is attached to the through hole to be provided.

DESCRIPTION OF SYMBOLS 1 Grommet 2 Door panel 2a Outer panel 2b Inner panel 2r1, 2r2 Round part 2e Plane part 3, 5 Through-hole 4 Body panel 10, 11 Large diameter cylinder part 15 Standing cylinder part 16 Locking recessed part 16a Bottom face 17 Locking part 17a Panel Locking surface 17b Round portion 17c Outer peripheral surface of locking portion main body 22 Seal lip

Claims (3)

A grommet that is molded from rubber or elastomer, is externally fitted to a wire harness, and is attached to a through-hole that is drilled in a panel that is an attached material,
A large-diameter cylindrical portion provided with an annular locking recess to be fitted to the periphery of the through-hole, and provided with a thick locking portion by projecting the side wall sandwiching the bottom surface of the locking recess outward, The locking portion is provided with a rounded portion on the protruding side of the panel locking surface that is continuous with the side wall of the locking recess, and is continuous with the outer peripheral surface of the locking portion main body having the maximum diameter through the rounded portion, and the panel A seal lip that presses against the panel at the periphery of the through hole is protruded at the outer end position until reaching the rounded portion of the locking surface,
The rounded portion of the locking portion and the outer peripheral surface of the locking portion main body are dimensioned so as to be in close contact with the inner peripheral surface of the rounded portion of the panel and the inner surface of the flat portion continuous to the inner peripheral surface of the rounded portion. Grommet to do.   The long cylindrical portion is attached to the oval through hole formed in the bent and narrowed portion of the panel, and the large-diameter cylindrical portion has straight sides on both sides in the width direction. The grommet according to claim 1, wherein the grommet has a shape.   Attached to a wire harness that extends from the side door or back door of an automobile to the vehicle body, a bellows-like small-diameter cylindrical portion is continuously connected to the large-diameter cylindrical portion that is attached to a through-hole drilled in the bent portion of the peripheral edge of the door inner panel. The grommet according to claim 1 or 2, wherein a large-diameter cylindrical portion is provided at the other end of the small-diameter cylindrical portion and is attached to a through hole formed in the vehicle body.

Images