JP2014135845A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unforeseen curl-up of the peripheral part of a grommet fixed with waterproofness so as to be applied to the surface of a fixed part.SOLUTION: In a grommet having a fixed base 13 being fixed so as to be applied to the surface of an attached part, while supporting the base of a protection tube 12 passing a wire harness, including a grommet inner attachment portion 33 for attaching a grommet inner in the fixed base 13, and including a lip 34 stretching outward and coming into pressure contact with the surface of an attached part on the outer periphery of the fixed base 13, a plurality of outer ribs 35 extending radially from the outer peripheral surface of a tubular part 31 where the protection tubes 12 are provided continuously in the fixed base 13, are provided integrally on the upper surface of the lip 34.

Description

  The present invention relates to a grommet that protects a wire harness, and more particularly to a grommet that is used, for example, for wiring a vehicle door harness.

  For the wiring of the vehicle door harness, for example, a grommet as in Patent Document 1 below is used. This grommet (grommet body) is made of rubber and integrally includes a grommet inner made of synthetic resin and fixed to the door side. The grommet and the grommet inner are integrated with the grommet inner projecting on the inner surface side of the substantially flat grommet having a harness protection cylinder for protecting the wire harness.

  On the grommet inner, a clip that engages with a clip engaging hole of a grommet mounting recess formed on the side surface portion of the vehicle door is projected, and a waterproof lip that prevents water from entering is formed on the base side of the clip. ing. That is, when the clip is inserted into the clip engagement hole and engaged, the waterproof lip closes between the clip and the clip engagement hole and stops water. At this time, the peripheral edge of the outer periphery of the grommet is pressed against the edge of the grommet mounting recess of the vehicle door to provide waterproofing. In other words, the waterproofing is doubled.

  However, the grommet is made of rubber as described above, and the peripheral portion is formed so as to be elastically displaced with a cross-sectional shape that becomes thinner toward the tip side. There is a possibility that the waterproofness at the edge of the mounting recess is impaired.

  If the waterproofness at the edge of the grommet mounting recess is impaired, water will be allowed to enter the inside, and this will place a burden on the waterproofing at the waterproof lip.

Japanese Patent No. 4091188

  In view of the above, the main object of the present invention is to prevent an unexpected rolling-up of the peripheral edge of the grommet.

  The present invention has a fixed base portion that supports a base portion of a protective cylinder portion through which a wire harness is passed and is fixed so as to contact the surface of a mounted portion, and a grommet inner mounting portion for mounting a grommet inner in the fixed base portion And a grommet provided on the outer periphery of the fixed base portion and having a lip portion that projects outwardly and press-contacts the surface of the attached portion, wherein the protective cylinder portion is provided on the upper surface of the lip portion and on the fixed base portion. A plurality of outer ribs extending integrally from the outer peripheral surface of the cylindrical portion that is continuously provided are integrally provided. The “upper surface of the lip portion” means a surface on the opposite side to the surface that is in pressure contact with the surface of the mounted portion.

  According to the present invention, since the upper surface of the lip portion is pressed by a plurality of outer ribs extending from the outer peripheral surface of the cylindrical portion of the fixed base portion, the lip portion is structurally reinforced and the lip portion made of a flexible material is uncovered. Suppressing squeezing and high waterproofness at the surface portion of the mounted portion can be obtained.

  As an aspect of the present invention, the outer rib can be configured to extend radially from the center of the cylindrical portion.

  According to the present invention, since the outer rib extends so as to spread in all directions from the center of the tubular portion, it is possible to effectively prevent the lip portion from rolling up with good stability.

  As an aspect of the present invention, the outer rib can be configured such that the height of the outer rib decreases toward the tip side.

  According to the present invention, since the structural strength is higher on the base side of the outer rib and the tip side is more flexible, the adhesion can be improved.

  As an aspect of the present invention, an inner lip portion that is in pressure contact with the surface of the mounted portion is provided on the inner peripheral side of the lip portion, and a plurality of the lip portions are held separately between the inner lip portion and the lip portion. It can be set as the structure provided with the inner rib.

  According to the present invention, the inner lip portion is pressed against the surface of the attached portion together with the lip portion, so that the area of close contact can be increased and the water stoppage can be improved. In addition, the inner rib reinforces the inner lip and prevents the inner lip from rolling up, and the lip located on the outer side also reinforces to prevent easy displacement. It encourages the lip parts to be reinforced together. As a result, a high waterproof property can be obtained at the surface portion of the mounted portion.

  As an aspect of the present invention, the inner rib may be formed at a position corresponding to the outer rib. The “corresponding position” is a position in which the center position in the thickness direction of the inner rib and the center position in the thickness direction of the outer rib match, and the inner rib and the outer rib are arranged back to back via the lip portion. That is.

  According to the present invention, since the outer rib suppresses the elastic displacement of the inner rib, the degree of reinforcement of the inner lip portion is increased and higher waterproofness can be obtained.

  According to the present invention, it is possible to prevent the peripheral edge of the grommet from rolling up unexpectedly and improve the waterproofness.

The perspective view which shows the front surface, left side surface, and plane of a grommet. The perspective view which shows the back surface, left side surface, and plane of a grommet. The partial cross section side view of a grommet, a grommet inner, and a to-be-attached part. Sectional drawing of the principal part. Sectional drawing of an action state.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing the front, left side, and plane of the grommet 11, and FIG. 2 is a perspective view showing the back, left side, and plane of the grommet 11. 3 is a partially sectional side view of the grommet 11, the grommet inner 16, and the attached portion 15 in a disassembled state, FIG. 4 is a sectional view showing the main part of the grommet 11, and FIG. .

  The grommet 11 in the illustrated example is used for wiring a vehicle door harness, and as shown in FIGS. 1 and 2, supports the protective cylinder portion 12 through which the wire harness passes and the base portion of the protective cylinder portion 12. It has a fixed base 13 and a connection part 14 formed at the tip of the protective cylinder part 12. The protective cylinder part 12, the fixed base part 13, and the connection part 14 are made of rubber or synthetic resin and are integrated.

  The protective cylinder portion 12 is formed in a cylindrical bellows shape having a required length and is freely bendable.

  The connection portion 14 is a portion to which a connector (not shown) is connected, and is formed in an appropriate shape.

  The fixed base portion 13 includes a tubular portion 31 having a tubular shape that is connected to the protective tubular portion 12 so as to support the protective tubular portion 12, and a plate-like plate-like portion that extends in all directions from the base portion of the tubular portion 31. 32. The cylindrical portion 31 has a cylindrical shape. The plate-like portion 32 is a portion that is fixed so as to be in contact with the surface of the side surface of the door panel (see FIG. 3) as the attached portion 15, and is substantially semi-oval. The cylindrical portion 31 is provided at one end of the plate-like portion 32 that draws an arc so that the center of the arc coincides with the center of the cylindrical portion 31. The other end side of the plate-like portion 32 has a shape that is slightly wider toward the end portion side, and the other end has a convex triangular shape with an obtuse angle close to 180 degrees.

  A grommet inner mounting portion 33 for mounting the grommet inner 16 is provided in the fixed base portion 13 (see FIGS. 2 and 3).

  Here, the grommet inner 16 will be briefly described. The grommet inner 16 is configured to route the wire harness 17 inserted into the protective cylinder portion 12 along the door panel, as shown in a side view in FIG. In addition, a member that is bent in an L shape at a position corresponding to the cylindrical portion 31 and a position corresponding to the other end side of the plate-like portion 32 and is guided in a predetermined direction, and is made of a synthetic resin having an appropriate hardness and flexibility. Is formed.

  The grommet inner 16 includes a main body portion 61 that houses the wire harness 17 and a clip portion 62 that projects from the surface of the main body portion 61 on the attached portion 15 side. The main body 61 has a substantially box shape that is thin enough to fit in a grommet mounting recess 15 a formed in the attached portion 15.

  A plurality of attachment pieces 63 projecting outward are provided on the opposite side of the body portion 61 to the attachment portion. A plurality of attachment grooves 33 a for fitting these attachment pieces 63 and integrally connecting the grommet 11 and the grommet inner 16 are formed in the plate-like portion 32 of the grommet 11 to constitute the grommet inner attachment portion 33. .

  The clip part 62 of the grommet inner 16 is formed to have a size that fits and penetrates the clip engagement hole 15b of the grommet mounting recess 15a of the mounted part 15, and the clip part 62 is formed on the side surface of the clip engagement hole 15b. It has a plurality of engagement claws 64 that are engaged with the edge of the clip engagement hole 15b when protruding to the opposite side and a predetermined engagement state is obtained.

  Further, a clip-side waterproof lip portion 65 is formed in an annular shape at the base portion of the clip portion 62 so as to stop the water by pressing against the edge of the clip engagement hole 15b when the engagement claw 64 is engaged.

  A portion of the outer periphery of the fixed base portion 13 excluding the other end of the plate-like portion 32 projects outward, and the clip portion 62 of the integrated grommet inner 16 is engaged with the clip engaging hole 15b of the grommet mounting recess 15a. A lip portion 34 is provided in pressure contact with the outer peripheral surface of the grommet mounting recess 15a at the time of joining. The lip portion 34 has a cross-sectional shape that is curved toward the attached portion 15 side toward the tip end side, and the tip end side is thinner from the middle toward the tip end side.

  As shown in FIGS. 1 and 4, a plurality of lip portions 34 extend from the outer peripheral surface of the cylindrical portion 31 of the fixed base portion 13 on the upper surface of the lip portion 34 (the surface on the opposite side to the surface pressed against the mounted portion 15). The outer rib 35 is integrally provided. The outer rib 35 is a plate-like plate having a substantially triangular shape when viewed from the side, and extends from the upper end position of the cylindrical portion 31 to the tip of the lip portion 34. The thickness of the outer rib 35 is the same throughout.

  The outer rib 35 having such a shape is formed so as to extend radially at a portion having the lip portion 34 with the center of the cylindrical portion 31 as the center. The formation interval of the outer rib 35 is appropriately set based on the hardness of the material or the like according to the desired degree of reinforcement.

  An inner lip portion 36 that is in pressure contact with the surface of the mounted portion 15 is provided on the surface on the inner circumferential side of the lip portion 34 that is in pressure contact with the mounted portion 15. The inner lip portion 36 is formed in a portion other than the other end of the plate-like portion 32 on the outer periphery of the fixed base portion 13 in the same manner as the lip portion 34, and has a cross-sectional shape that curves toward the attached portion 15 side toward the distal end side. From the middle, the tip side is thinner toward the tip side.

  The amount of protrusion of the inner lip portion 36 toward the mounted portion 15 side is set to be slightly smaller than the amount of protrusion of the lip portion 34 located on the outer peripheral side, and a uniform gap is provided between the lip portion 34 and the entire lip portion 34. Have. A plurality of inner ribs 38 for separating and holding the inner lip portion 36 and the lip portion 34 are provided at the base side of the inner lip portion 36 and the lip portion 34 in the gap 37. Like the outer rib 35, the inner rib 38 is a plate having the same thickness throughout.

  The formation position and the number of the inner ribs 38 are set as appropriate, but the formation position may be a position corresponding to the outer rib 35 as shown in FIGS. The number of the inner ribs 38 formed is the same as that of the outer ribs 35 as in the illustrated example, and can be increased or decreased as compared with the outer ribs 35. The formation position and number of the inner ribs 38 are appropriately set based on the form of the outer ribs 35, the hardness of the material, and the like according to the desired degree of reinforcement, as in the case of the outer ribs 35.

  In addition to the lip portion 34 and the inner lip portion 36, a waterproof protrusion 39 that is waterproofed by being pressed against the attached portion 15 is attached to the base portion of the inner lip portion 36 as shown in FIGS. It is formed over the entire circumference on the surface facing the portion 15.

The grommet 11 having such a configuration has the following operational effects.
In use, first, the connector of the wire harness 17 is attached to the connection portion of the grommet 11, and the grommet inner 16 through which the wire harness 17 is passed is attached to the grommet inner attachment portion 33 of the grommet 11.

  Next, the wire harness 17 is placed along a predetermined position of the door panel, and the clip portion 62 of the grommet inner 16 integrated with the grommet 11 is engaged with the clip engagement hole 15b of the grommet mounting recess 15a of the door panel. When the grommet inner 16 is pressed so as to fit into the grommet mounting recess 15a, the clip portion 62 fits into the clip engaging hole 15b, and the engaging claw 64 engages with the edge of the clip engaging hole 15b. Installation is completed as shown in FIG.

  At this time, the clip-side waterproof lip 65 at the base portion of the clip portion 62 is elastically displaced, and a water-stopping state is established between the clip engagement hole 15b and the grommet inner 16 while having an urging force for elastic recovery.

  Further, on the outer surface of the grommet mounting recess 15a on the front side of the clip engagement hole 15b, the outer lip 34 and the inner lip 36 of the fixed base 13 are elastically displaced from the grommet mounting recess 15a. Press against the surface on the side to obtain a water stoppage. The elastic displacement of the lip portion 34 and the inner lip portion 36 is suppressed by the outer rib 35 and the inner rib 38 acting so as to maintain their shapes. Specifically, the outer rib 35 presses the upper surface of the lip portion 34, and the inner rib 38 presses the inner lip portion 36, and the inner lip portion 36 and the lip portion 34 are separated and held together. 34 and the inner lip portion 36 are prevented from deforming each other to prevent elastic displacement due to the flexibility of the material.

  Therefore, the lip portion 34 and the inner lip 36 and their vicinity are structurally reinforced, and a strong pressure contact state is obtained on the outer peripheral surface of the grommet mounting recess 15a. Due to the strong pressure contact, the lip portion 34 and the inner lip portion 36 are prevented from rolling up and high waterproofness is obtained at the surface portion of the mounted portion 15.

  Further, the structurally reinforced lip portion 34 and inner lip portion 36 act to urge the grommet inner 16 in the pulling direction, so that the engagement state of the clip portion 62 of the grommet inner 16 with respect to the clip engagement hole 15b is maintained. It can be held strongly and can prevent rattling from vibrations.

  Since the pressure contact with the surface of the mounted portion 15 is performed not only by the lip portion 34 but also by the inner lip portion 36, the contact area is increased as compared with the case where only the lip portion 34 is provided, and the waterstop performance is improved. In addition, since the inner and outer double lip portions (the lip portion 34 and the inner lip portion 36) are provided, the pressure contact state with respect to the attached portion 15 becomes tenacious as compared with a single case.

  The inner lip portion 36 is reinforced by the inner rib 38 provided back-to-back with the outer rib 35 and is integrated with the lip portion 34, so that the structural strength of the inner lip portion 36 is increased and the degree of adhesion is higher. A pressure contact state is obtained.

  In spite of being able to obtain such a strong and tenacious pressure contact state, the outer rib 35 and the inner rib 38 have a shape with a lower height toward the distal end side, so that they have flexibility and adhere to the surface of the mounted portion 15. Can improve the performance and contribute to prevention of drowning.

  Moreover, since the outer rib 35 and the inner rib 38 are formed so as to spread radially from the center of the cylindrical portion 31, the pressure contact state is stable, and the lip portion 34 and the inner lip portion 36 swell up and the grommet 11. The rattling can be effectively prevented.

  As a result of the high waterproofness of the grommet 11 on the surface of the mounted portion 15, the waterproofness of the clip-side waterproof lip 65 in the vicinity of the clip portion 62 of the grommet inner 16 can be complemented, and the overall waterproof performance can be improved. .

  The above is a configuration of one embodiment for carrying out the present invention, and the present invention is not limited to the above-described configuration, and other configurations can be adopted.

  For example, the lip portion can be formed not in double but in triple. In this case, the ribs can also be arranged inside and outside in triple or the like.

  Further, the outer ribs 35 are not limited to a radial shape, and may be formed in, for example, a lattice shape in a plan view or a honeycomb shape. The thickness of the rib is not the same as the whole, but the thickness can be changed, for example, by making the tip side thinner.

  The directions, shapes, and the like of the protective cylinder portion 12 and the fixed base portion 13 are appropriately set according to the use location.

DESCRIPTION OF SYMBOLS 11 ... Grommet 12 ... Protection cylinder part 13 ... Fixed base 15 ... Mounted part 16 ... Grommet 17 ... Wire harness 31 ... Cylindrical part 33 ... Grommet inner attachment part 34 ... Lip part 35 ... Outer rib 36 ... Inner lip part 38 ... Inner rib

Claims (5)

Supporting the base of the protective cylinder through which the wire harness is passed, and having a fixed base fixed so as to be applied to the surface of the mounted part, and provided with a grommet inner mounting part for attaching a grommet inner in the fixed base, A grommet provided with a lip portion that protrudes outward on the outer periphery of the fixed base portion and press-contacts the surface of the attached portion,
A grommet integrally provided with a plurality of outer ribs extending from an outer peripheral surface of a cylindrical portion having a cylindrical shape in which the protective cylinder portion is continuously provided in the fixed base portion on an upper surface of the lip portion. The grommet according to claim 1, wherein the outer rib extends radially around the center of the cylindrical portion. The grommet according to claim 1 or 2, wherein the height of the outer rib decreases toward the tip side. An inner lip portion that is in pressure contact with the surface of the attached portion is provided on the inner peripheral side of the lip portion,
The grommet according to any one of claims 1 to 3, further comprising a plurality of inner ribs that separate and hold the inner lip portion and the lip portion. The grommet according to claim 3, wherein the inner rib is formed at a position corresponding to the outer rib.

Images