JP4383396B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet that covers a wire harness.

  Conventionally, a grommet is put on a wire harness routed from an automobile engine room to a vehicle interior, and the grommet is mounted in a through hole of a vehicle body panel that partitions the engine room and the vehicle interior, and the wire harness machine passes through the through hole. It is intended to protect the vehicle from the engine room side to the vehicle compartment, as well as to prevent water, dust and sound.

  Various types of grommets of this type have been developed and put to practical use. One of these grommets is a through-hole formed on the outer periphery of the grommet simply by pushing the grommet into the through-hole of the vehicle body panel from one direction. A so-called one-motion grommet is provided in which the periphery of the through hole is locked to the locking recess (for example, Patent Document 1).

  That is, as shown in FIG. 5, the grommet 10 has a wire harness insertion hole 13 (see FIG. 6) that covers and covers the wire harness 21 from one end 11 to the other end 12. A tapered portion 14 'having a taper 14 whose outer diameter gradually increases toward the end 12 side, a through-hole locking recess 15 is formed in the vicinity of the maximum diameter, and the tapered portion 14' has a tapered portion. A plurality of ribs 16 are formed along the longitudinal direction of 14.

The rib 16 serves to ensure mechanical strength in the radial direction of the grommet 10 and to prevent the vehicle body panel 31 fitted in the through-hole locking recess 15 from slipping out of the through-hole locking recess 15. Is.
JP 2003-111250 A

  However, in the grommet, as shown in FIG. 6, the thickness of one side 16 ′ of the rib 16 is equal to the thickness of the other side 16 ″. For this reason, when the grommet 10 is inserted into the through hole 32 of the vehicle body panel 31, the rib 16 is not easily deformed, and the outer diameter of the rib 16 is not easily crushed so as to be smaller than the through hole of the vehicle body panel. Could not insert.

  The present invention has been made in view of this point, and has a wire harness insertion hole through which the wire harness passes from one end to the other end, and the outer diameter gradually increases from the one end toward the other end. In the grommet having a tapered portion having a taper, a through-hole locking concave portion is formed in the vicinity of the maximum diameter, and a plurality of ribs are formed on the outer periphery of the tapered portion along the longitudinal direction of the taper. The thickness of one side or the other side that constitutes is configured to be thinner than the thickness on the opposite side.

  According to the present invention, when the grommet is inserted into the through hole of the vehicle body panel, the thin side of the rib is easily deformed so that the outer diameter of the rib becomes a small diameter. Can be easily inserted.

The grommet of the embodiment of the present invention is configured as follows.
The material constituting the grommet is made of an elastic material.
It is characterized in that 3 to 12 ribs are formed.

The present invention will be described below with reference to illustrated embodiments.
1 to 4, reference numeral 19 denotes a grommet according to the present invention. In the figure, 11, 12, 13, 14, 14 ', 15, 16, 16' and 16 '' are respectively shown in FIGS. 6, one end, the other end, a wire harness insertion hole, a taper, a taper portion, a through hole locking recess, a rib, one side, and the other side.

  The grommet 19 of this embodiment has a thickness of one side 16 ′ and the other side 16 ″ constituting the rib 16 as shown in FIG. The difference is that the thickness of one side 16 'side is reduced between the sides.

That is, in the grommet 19 of the present embodiment, as shown in FIG. 1 (b), the thickness of one side 16 ′ of the rib 16 is d1, and is thinner than the thickness d2 of the other side 16 ″. It has become.
For this reason, when the grommet 19 is inserted into the through hole of the vehicle body panel, the outer side of the rib 16 is easily deformed from the dotted line shape to the solid line shape as shown in FIG. Then, the rib 16 is crushed so that the outer diameter becomes a small diameter, and the grommet 19 can be easily inserted into the through hole of the vehicle body panel.

  Further, the grommet 19 of the present embodiment is formed with a flat portion 11 ′ having a uniform outer diameter on one end 11 side and a bellows portion 12 ′ whose outer diameter changes in a wavy shape on the other end 12 side. Thereby, the influence with respect to the bending of the electric wire which penetrates the grommet 19 can be relieved.

  The grommet 19 of this embodiment is made of an elastic material such as a rubber material (EPCM material or CR), and can change the outer diameter relatively easily.

  Although the ribs of the grommet 19 of the present embodiment are formed as 8 ribs, the present invention may have other number of ribs, and can be appropriately changed within a range of 3 to 12, for example. The same effect can be obtained.

  The grommet 19 of this embodiment has a minimum inner diameter of 80 mm, a maximum outer diameter of 100 mm, a wall thickness of 1.0 to 2.0 mm, and a longitudinal dimension of about 150 to 200 mm. The present invention can be applied in the same manner even if the dimensions are other than this, but d1 ≦ 0.7 × d2 is preferable in order to sufficiently exhibit the effects of the invention.

In the present embodiment, an example in which the same side of each rib 16, that is, one side 16 ′ is thin, is shown, but the side on a different side between the ribs 16 may be thin.
However, it is preferable that the same side is thin, because when the grommet 19 is inserted into the through hole of the vehicle body panel, the grommet 19 is easily rotated in the direction of the thin side, so that the insertion resistance is small.

2A is a cross-sectional view taken along the line CC of FIG. 2B showing an embodiment of the present invention, and FIG. 2B is an enlarged cross-sectional view of a circled portion in FIG. 1 shows an embodiment of the present invention, in which A is a front view and B is a right side view. Sectional drawing in the BB line of FIG. The principal part expanded sectional view at the time of grommet insertion in one Example of this invention. The partial cross section side view which shows an example of the past. FIG. 6 is a cross-sectional view of main parts of FIG. 5.

Explanation of symbols

11 One end 11 ′ Flat portion 12 Other end 12 ′ Bellows portion 13 Wire harness insertion hole 14 Taper 14 ′ Taper portion 15 Through hole locking recess 16 Rib 16 ′ One side 16 ″ The other side 19 Grommet

Claims (4)

  It has a wire harness insertion hole that allows the wire harness to pass from one end to the other end, and has a taper portion having a taper whose outer diameter gradually expands from the one end toward the other end, and near its maximum diameter In the grommet in which a through-hole locking recess is formed in the grommet and a plurality of ribs are formed on the outer circumference of the tapered portion along the longitudinal direction of the taper, the thickness of one side or the other side constituting each rib is reversed. Grommet characterized by being made thinner than the wall thickness on the side.   The grommet according to claim 1, wherein the grommet is made of an elastic material.   The grommet according to claim 1 or 2, wherein 3 to 12 ribs are formed. The thickness of the one side which comprises each said rib, or the same side of the other side is comprised thinner than the thickness of an other side, The Claim 1 characterized by the above-mentioned. Grommet.

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