JP5533368B2 - Sound insulation structure of grommet mounting part - Google Patents

Description

  The present invention relates to a sound insulation structure for a grommet mounting portion, and more specifically, a grommet fitted to the through-hole, with the grommet being externally mounted on a wire harness routed from a vehicle engine compartment to a vehicle compartment through a through-hole of a vehicle body panel. It is intended to improve the sound insulation of the mounting portion.

In order to achieve the sound insulation performance of the grommet mounting part, as shown in FIG. 4, a sound insulation material having a sound absorbing property at the periphery of the through hole H is provided on the side surface of the dash panel P that partitions the engine room X and the vehicle compartment Y. A silencer 100 is attached.
In JP-A-8-308067 (Patent Document 1), as shown in FIG. 5, a grommet 110 that is externally mounted on a wire harness W / H is attached to a through hole H, and a seal lip 111 provided on the grommet 110 is provided. The through hole H is passed through and pressed against the silencer 100 from the passenger compartment side.
By bringing the seal lip 111 into contact with the silencer 100, no gap is formed between the through hole H and the silencer 100, and noise on the engine room X side is prevented from entering the vehicle compartment Y, and On the side of the passenger compartment, the silencer 100 absorbs the noise on the engine compartment side to keep the passenger compartment Y quiet.

  In Japanese Patent Laid-Open No. 2002-44839 (Patent Document 2), there is a case where a silencer is attached to the grommet, and the sound is insulated by closing the inner circumference of the grommet and the wire harness penetrating through the grommet with the silencer.

  In addition, as shown in FIG. 4, when a two-piece grommet 150 in which a grommet main body 151 made of an elastic body such as rubber and a resin inner 152 made of a resin molded product are used, the grommet main body 151 is provided. The seal lip 155 is pressed against the side of the engine room of the dash panel P.

Japanese Patent Laid-Open No. 8-308067 JP 2002-44839 A

In Patent Document 1 shown in FIG. 5, the seal lip 111 is attached to the insertion-side tip of the grommet 110.
There is a problem in that the workability of inserting the through hole H is very poor because the outer diameter of the enlarged diameter tube 112 is larger than the inner diameter of the through hole H.
Further, even if a silencer is provided inside the grommet, the sound insulation performance from the periphery of the through hole on the outer periphery of the grommet cannot be improved.

  In the structure shown in FIG. 4, there are four routes (1) to (4) through which noise leaks from the engine room X to the vehicle compartment Y. Among these, the sound insulation from the routes (2) to (4) in the region surrounded by the portion where the seal lip of the grommet 150 is in contact with the dash panel can be highly enhanced. However, the sound leakage of the route (1) passing through the portion surrounded by the through hole 100h of the silencer 100 from the outer engine room side away from the grommet cannot be reduced, which causes indoor noise.

  If the seal lip of the grommet can be brought into contact with the silencer 100 attached to the passenger compartment side with respect to the problem, the sound insulation of the route (1) can be achieved. However, if the hole provided in the silencer 100 is made smaller than the panel through hole and protrudes into the hollow from the periphery of the through hole, the workability of inserting the wire harness is deteriorated, while the annular seal lip provided in the grommet has a larger diameter than the through hole. Then, there is a problem that it becomes difficult to insert the grommet provided with the seal lip into the through hole.

  This invention is made | formed in view of the said problem, and makes it the subject to aim at the improvement of sound insulation performance, without impairing the attachment property to the through-hole of a grommet.

In order to solve the above problems, the present invention provides:
A silencer layer that surrounds the outer periphery of the through hole is provided on the side of the vehicle interior of the vehicle body provided with a through hole for inserting a wire harness with a burring protruding from the periphery,
The wire harness inserted through the through-hole comprises a grommet main body made of rubber or elastomer, a resin inner fitted inside the grommet main body, and an umbrella member made of an elastomer resin that is movably assembled to the grommet main body. The grommet is packaged,
The umbrella member includes a large-diameter cylindrical handle portion, and an umbrella portion that is shaped to bend and expand outward from one end side of the handle portion,
An umbrella member accommodating cylinder portion that movably accommodates the umbrella member is provided in the resin inner, and the umbrella portion of the umbrella member is accommodated in the umbrella member accommodating cylinder portion as a straight line continuous with the handle portion. ,
The grommet which passes the grommet through the through-hole of the vehicle body, pulls out the umbrella portion from the umbrella member housing cylinder portion, opens the umbrella portion, and presses the seal portion at the tip of the umbrella portion against the side of the passenger compartment of the silencer layer It provides a sound insulation structure for the mounting part.

In the grommet, when inserting the grommet into the through hole of the vehicle body, the umbrella portion of the sealing umbrella member is accommodated in the umbrella member accommodating cylinder portion of the resin inner as a straight line continuous to the handle portion, the umbrella portion of the umbrella member after insertion is bent outwardly Shi pull out from the bevel member holding cylinder portion and an open state in in contact with a silencer layer sealing portion provided at a tip from the cabin side. Thereby, sound leakage from the periphery of the through hole where the silencer is not attached, that is, from the through hole of the silencer, can be reduced or prevented without causing the silencer layer to protrude from the through hole.

The operator may perform the work of pulling out the above-mentioned umbrella part from the umbrella member housing cylinder part and expanding it, but it is preferable to provide an extruded part in the grommet body.
That is, the grommet body is provided with a bellows portion that is pulled toward the insertion side when inserted into the through hole, and the handle portion of the umbrella member protrudes toward the bellows portion side,
From the state where the handle portion of the umbrella member is pressed by the bellows portion at the time of insertion into the through-hole of the vehicle body, the umbrella portion is pushed out from the umbrella member accommodation tube portion, and the umbrella portion is linearly accommodated in the umbrella member accommodation tube portion. is open.

When the configuration, in the insertion process into the through holes of the grommet, the umbrella portion expanded can isosamples extruding the shank portion of the umbrella member deformation of the grommet body. The grommet body variant pattern and portions of the opposing position of the umbrella member is deformed so as to protrude into the vehicle compartment side by the grommet is pulled into the vehicle compartment side, extruded portion of the handle in this variant, umbrella straight state The umbrella part is expanded by pushing out the umbrella part accommodated in the member accommodation cylinder part.

The grommet main body includes a small-diameter cylindrical portion through which the wire harness is closely inserted, the bellows portion formed by providing irregularities in the radial direction from the outer periphery of the small-diameter cylindrical portion, and a resin provided at the outer peripheral end of the bellows portion. An inner inner locking portion, a burring provided on the front end surface of the resin inner inner locking portion, and a seal lip portion that presses against the vehicle body,
The resin inner includes a radial annular portion that is fitted on the small-diameter cylindrical portion of the grommet body and overlaps the bellows portion, the umbrella member accommodating cylindrical portion protruding from the annular portion, and the umbrella member accommodating cylindrical portion Provided with a burring locking portion projecting an L-shaped locking collar at the base end of the cylindrical portion that is provided on the outer peripheral side of the burring and is positioned on the inner peripheral surface of the burring, The portion is internally fitted and fixed to the resin inner fitting engagement portion of the grommet body.

  Moreover, you may make the said grommet main body project the cylindrical part for wire rod penetration on the inner peripheral side of the said bellows part. A hose for supplying washer cleaning water and an opener cable for opening the bonnet are inserted into the tubular portion for penetrating the wire.

In the sound insulation structure of the grommet mounting portion of the present invention having the above-described configuration, the umbrella portion of the sealing umbrella member is accommodated in the umbrella member accommodating cylinder portion of the resin inner as a straight line continuous with the handle portion when inserted into the through hole of the vehicle body. Since it is not expanded from the through hole as a state in which it is made, it can be passed smoothly without impeding the workability of inserting the grommet into the through hole. Further, when the umbrella portion of the umbrella member is inserted through the through hole, attach the umbrella portion extruding portion of the handle in the deformed portion of the grommet body bent outwardly spread state and to order, the cabin side Without protruding the silencer into the through hole, the seal lip provided at the tip of the umbrella member can be brought into contact with the periphery of the through hole provided in the silencer from the passenger compartment side. Thereby, the sound leakage from the engine room side through the through hole of the silencer can be reduced or prevented.

It is sectional drawing which shows embodiment of this invention. It is a principal part expanded sectional view of the grommet used in the said embodiment. (A) is sectional drawing of the process of inserting a grommet in a through-hole, (B) is sectional drawing after insertion. It is drawing which shows a prior art example. It is drawing which shows another prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a grommet that passes through a wire harness W / H through a through hole H with a burring provided in a dash panel P of a vehicle body that partitions an engine room X and a vehicle compartment Y of an automobile, and is externally attached to the wire harness. 1 is attached to the inner peripheral edge of the through hole H, and the seal lip 33 provided on the grommet 1 is brought into contact with the peripheral edge of the through hole 3a of the silencer 3 attached to the interior side surface Pi of the dash panel P from the vehicle interior side. ing. The through-hole 3a of the silencer 3 is concentric with the through-hole H of the dash panel P, and is communicated with an inner diameter that is slightly larger.
That is, the burring Hb that is bent from the periphery of the through hole H of the dash panel P protrudes toward the engine room X side, and the silencer 3 is attached to the side of the passenger compartment opposite to the dash panel P. The grommet 1 extends from the engine room X. It is inserted into the passenger compartment Y through the through hole H.

  The grommet 1 includes a grommet main body 10 made of rubber or an elastomer, a resin inner 20 fitted in the grommet main body 10, and a sealing umbrella member 30 made of an elastomer resin that is movably assembled to the grommet main body 10. It consists of.

  The grommet body 10 includes a small-diameter cylindrical portion 11 into which the wire harness is closely inserted and a bellows portion 12 formed by providing V-shaped irregularities in the radial direction from the outer periphery of the intermediate position in the axial direction of the small-diameter cylindrical portion 11. The inner resin fitting engagement portion 13 provided at the outer peripheral end of the bellows portion 12, the seal lip 14 for burring pressing provided on the front end surface of the inner resin fitting engagement portion 13 and the vehicle body pushing. A seal lip portion 15 is provided. The bellows portion 12 is provided with one large V-shaped concave portion 16 and is provided with the resin inner fitting engagement portion 13 that protrudes outward from the outer peripheral edge of the bellows portion 12 in a U-shape.

The resin inner 20 has a cylindrical shape, and is fitted on the small diameter cylindrical portion 11 of the grommet body 10 and overlaps the inner periphery of the bellows portion 12 with a radial annular portion 21 and an umbrella member housing projecting on the annular portion 21. A cylindrical portion 22 and a burring locking portion 23 provided on the outer peripheral side of the umbrella member accommodating cylindrical portion 22 are provided. The burring locking portion 23 includes a cylindrical portion 23a positioned on the inner peripheral surface of the burring Hb protruding from the peripheral edge of the through hole H, and an L-shaped locking flange portion 23b protruding from the proximal end of the cylindrical portion 23a. The locking collar portion 23b is fitted and fixed to the resin inner fitting locking portion 13 of the grommet body 10.
The umbrella member accommodating cylinder portion 22 is open at both ends, but a stopper projection 22 a is provided on the inner surface of the opening facing the bellows portion 12 and the V-shaped recess 16.

  The sealing umbrella member 30 is made of an elastomeric resin so as to be flexible, and has a large-diameter cylindrical handle portion 31 and bends outward from the tip of the handle portion 31 so as to expand. And the umbrella portion 32 shaped. A large-diameter portion 31a is provided at the base end of the handle portion 31, and a medium-diameter portion 31b is protruded at a position spaced from the large-diameter portion 31a. A seal lip 33 is provided along the outer peripheral edge of the umbrella portion 32.

Umbrella portion 32 can be forcibly deformed in a continuous linear state to the handle portion 31, and to be able to accommodate the umbrella portion 32 in a linear state in an umbrella member accommodating tube portion 22 of the resin inner 20. When this umbrella part 32 is pulled out from the umbrella member accommodation cylinder part 22 , it bends and spreads outward so that an umbrella may open. The protruding end of the umbrella portion 32 is a seal lip 33, and the size of the umbrella portion 32 is set to a size such that the outer peripheral seal lip 33 is pressed against the periphery of the through hole 3a of the silencer 3 in the expanded state. ing.

Next, the attachment process to the through-hole H of the grommet 1 attached to the wire harness W / H will be described.
The grommet 1 has a resin inner 20 and an umbrella member 30 assembled in advance on the grommet body 10. That is, the locking collar portion 23 b of the resin inner 20 is inserted and locked to the resin inner fitting locking portion 13 of the grommet body 10.
As shown in FIG. 3A, the umbrella portion 32 of the umbrella member 30 is accommodated in a straight state in the umbrella member accommodation tube portion 22 of the resin inner 20, and the handle portion 31 is V-shaped in the bellows portion 12 of the grommet body 10. It protrudes into the recess 16 . The large diameter portion 31 a on the proximal end side of the handle portion 31 is located in contact with the V-shaped recess 16 of the bellows portion 12.

  The small diameter cylindrical portion 11 provided on the grommet main body 10 of the grommet 1 is expanded with a jig so as to penetrate the wire harness W / H, and both ends in the length direction of the small diameter cylindrical portion 11 are wound with the wire harness W / H and an adhesive tape. It is stuck.

  In this way, the wire harness W / H with the grommet 1 exterior is inserted and locked in the through hole H of the dash panel P from the engine compartment X side to the vehicle compartment Y side. Specifically, the protruding side of the cylindrical portion 23a of the burring locking portion 23 of the resin inner 20 is inserted in the direction of the arrow in FIG. At that time, the V-shaped recess 16 of the grommet body 10 protrudes toward the engine room.

  The cylindrical portion 23a of the resin inner 20 is inserted into the through hole H provided in the dash panel P while being in contact with the inner peripheral surface of the burring Hb, and is further inserted into an L shape that protrudes from the base of the cylindrical portion 23a. The grommet body side sealing lip 14 on the grommet main body that is externally fitted to the locking collar portion 23b abuts against the tip end surface of the burring Hb, and the body lip sealing lip portion 15 abuts against the outer surface of the dash panel.

As described above, when the seal lip 14 and the seal lip portion 15 come into contact with the burring Hb and the dash panel P, the umbrella portion 32 of the umbrella member 30 is still accommodated and held in the umbrella member accommodating cylinder portion 22 in a straight state. There is a large gap between the outer periphery of the umbrella portion 32 and the through hole H and the inner peripheral surface of the through hole 3a of the silencer 3, so that it can be smoothly passed through the through hole 3a of the silencer 3.

  When the burring locking portion 23 of the resin inner 20 is locked to the burring, the wire harness W / H is further pulled to pull the small-diameter cylindrical portion 11 of the grommet body 10 toward the passenger compartment Y side. As shown in (B), the V-shaped recess 16 is pulled and deformed toward the passenger compartment. The deformed bellows portion 12 contacts the large-diameter portion 31a at the proximal end of the handle portion 31 of the umbrella member 30, and is deformed so as to push up the handle portion 31 to the passenger compartment Y side according to the pulling of the wire harness W / H. .

When the handle portion 31 advances in the umbrella member accommodation tube portion 22 and the tip provided with the seal lip 33 of the linear umbrella portion 32 continuous to the handle portion 31 is pushed out from the umbrella member accommodation tube portion 22, the umbrella portion 32. Is released from the load in the linear direction and elastically returns to the shaped opening direction, and as shown in FIGS. 1 and 2, the umbrella portion 32 is bent outward and opened.
When the umbrella portion 32 is opened, the seal lip 33 provided on the outer peripheral edge thereof is pressed against the entire peripheral edge position of the through hole 3a of the silencer 3 from the passenger compartment Y side. In addition, the handle portion 31 has the medium diameter portion 31b inserted into the umbrella member accommodating cylinder portion 22, but the large diameter portion 31a is stopped by the stopper projection 22a to prevent the umbrella member 30 from being detached from the resin inner 20. The umbrella portion 32 is securely held in an open state.

When the pulling of the wire harness W / H is stopped in a state where the umbrella portion 32 is opened, the bellows portion 12 of the grommet body 10 is elastically restored from the inclined state in which the inner peripheral side is pulled toward the passenger compartment side to the original state, and the umbrella member However, the umbrella member 30 does not return to the umbrella member accommodating cylinder portion 22 which is accommodated only in a straight state because the umbrella portion 32 is open.

Thus, when the grommet 1 is passed through the through hole H, since the umbrella portion 32 is not bent outward and opened, it can be smoothly passed through the through hole. In addition, when passing through the through hole H, the umbrella portion 32 opens and abuts the periphery of the through hole 3a of the silencer 3, so that the sound passing through the through hole 3a of the silencer 3 can be reduced without reducing the through hole 3a of the silencer 3. Leakage can be prevented.

In the above-described embodiment, the V-shaped concave portion provided in the grommet body is deformed to push up the handle portion 31 of the umbrella member 30 to open the umbrella portion 32, but the umbrella is contained in the umbrella member accommodation tube portion 22 of the resin inner 20. An operator may pull and pull out the umbrella member 30 that accommodates the portion 32 in a straight line . When the operator pulls out the umbrella part, the umbrella part 32 automatically opens.

  Furthermore, you may project and provide the cylinder part for wire penetration to the inner peripheral side of the bellows part of a grommet main body. The tubular portion for penetrating the wire rod is closed at the tip, and when the washer hose or the opener cable is inserted, the closed end is cut and penetrated.

DESCRIPTION OF SYMBOLS 1 Grommet 3 Silencer 3a Through-hole 10 Grommet main body 20 Resin inner 22 Umbrella member accommodating cylinder part 30 Umbrella member 31 Handle part 32 Umbrella part 33 Seal lip P Dash panel H Through hole Hb Burring W / H Wire harness

Claims (3)

A silencer layer that surrounds the outer periphery of the through hole is provided on the side of the vehicle interior of the vehicle body provided with a through hole for inserting a wire harness with a burring protruding from the periphery,
The wire harness inserted through the through-hole comprises a grommet main body made of rubber or elastomer, a resin inner fitted inside the grommet main body, and an umbrella member made of an elastomer resin that is movably assembled to the grommet main body. The grommet is packaged,
The umbrella member includes a large-diameter cylindrical handle portion, and an umbrella portion that is shaped to bend and expand outward from one end side of the handle portion,
An umbrella member accommodating cylinder portion that movably accommodates the umbrella member is provided in the resin inner, and the umbrella portion of the umbrella member is accommodated in the umbrella member accommodating cylinder portion as a straight line continuous with the handle portion. ,
The grommet which passes the grommet through the through-hole of the vehicle body, pulls out the umbrella portion from the umbrella member housing cylinder portion, opens the umbrella portion, and presses the seal portion at the tip of the umbrella portion against the side of the passenger compartment of the silencer layer Sound insulation structure of the mounting part. The grommet body is provided with a bellows portion that is pulled toward the insertion side when inserted into the through hole, and the handle portion of the umbrella member protrudes toward the bellows portion side,
Wherein in said bellows portion upon insertion into the body of the through hole by pressing the handle portion of the umbrella member extruding the bevel portion from the bevel member holding cylinder portion, by bending the bevel portion to the outward from the straight line state 2. The sound insulation structure for a grommet mounting portion according to claim 1, wherein the sound insulation structure is in an expanded state . The grommet body has a small diameter cylinder portion for inserting in close contact with the wire harness, and the bellows portion which is formed by providing an uneven from the outer periphery of the small-diameter cylindrical portion in a radial direction, a resin which is provided on the outer peripheral end of the meandering abdomen An inner inner locking portion, a burring provided on the front end surface of the resin inner inner locking portion, and a seal lip portion that presses against the vehicle body,
The resin inner includes an annular portion in the radial direction overlapping the bellows portion as well as fitted to the small diameter cylinder portion of the grommet body, and the umbrella member accommodating tubular portion projecting from the annular portion, bevel member holding cylinder Provided with a burring locking portion provided with an L-shaped locking collar at the base end of the cylindrical portion provided on the outer peripheral side of the portion and positioned on the inner peripheral surface of the burring, sound insulation structure of the grommet mounting portion according to 請 Motomeko 2 a flange portion that has been fitted in and fixed to the resin inner inside Hamagakari stop portion of the grommet body.

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