JP2010154601A - Grommet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain the shape of a grommet attached in a through-hole in a vehicle body panel and prevent the vehicle body anchor recess of the grommet from being deformed in such a direction that it is moved away from the peripheral edge of the through-hole, even when the grommet and a wiring harness inserted into the grommet are fixed by taping only on one end side. <P>SOLUTION: The grommet includes: a larger-diameter cylindrical part that continues to the circumference of the intermediate part of a smaller-diameter part for tightly inserting an electric wire in the direction of length and surrounds the other side of the smaller-diameter part and is increased in diameter; the vehicle body anchor recess annularly provided in the outer circumferential surface of the larger diameter side of the larger-diameter cylindrical part; an inside rib that couples together the inner circumference of the larger-diameter cylindrical part and the outer circumferential surface of the other side of the smaller diameter cylindrical part and is provided with a gap provided in the circumferential direction; and a wire insertion cylindrical part that continues to a wire insertion hole provided in the larger-diameter cylindrical part and is protruded from the larger diameter side open end through the interior of the larger-diameter cylindrical part. The inside rib is separated and protruded with a gap provided between it and the inner circumferential surface of the larger-diameter cylindrical part from a position where the inner circumferential surface of the through-hole in the vehicle body panel and the larger-diameter part are in contact with each other to a position where it is opposed to the vehicle body anchor recess. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a grommet that is attached to a wire harness that is routed to an automobile and is attached to a through hole of a vehicle body panel, and in particular, improves the workability of attaching the grommet and the wire harness.

  The wire harness routed from the engine room of the automobile to the passenger compartment side is routed through a through-hole drilled in the dash panel (or cowl panel) that separates the engine room from the passenger compartment. In order to prevent water from entering the passenger compartment from the hole and intrusion of dust, a grommet integrally molded with rubber or elastomer is externally attached to the wire harness, and the vehicle body locking recess provided in the grommet is locked to the periphery of the through hole. Yes.

As this type of grommet, the present applicant provides grommet 100 shown in FIG. 9 in Japanese Patent Application Laid-Open No. 2003-111250.
As shown in FIG. 9A, the grommet 100 includes a first diameter cylinder portion 101 and a diameter-enlarged cylinder portion 102 provided with a vehicle body engaging recess 103, which are continuous with the first diameter-diameter cylinder portion 101. A closed wall 104 is connected to the open end side, a second small-diameter cylindrical portion 105 is projected from the center of the closed wall 104, and the wire harness W / H is moved in the length direction as shown in FIG. 9B. The first small-diameter cylindrical portion 101 and the second small-diameter cylindrical portion 105 at both ends are fixed by being wound around with adhesive tape T.
In addition, the enlarged diameter cylindrical portion 102 is provided with a through hole 106a through which a wire made of a washer hose and a hood opener cable is passed, and a closed wall portion is inserted through the hollow portion of the enlarged diameter cylindrical portion 102 from the periphery of the through hole 106a. A wire rod insertion portion 106 including a wire rod insertion tube portion 106 b protruding from 104 is provided. The wire insertion tube portion 106 b protruding from the closing wall portion 104 is located on the outer periphery of the second small diameter tube portion 105.

  Since the wire rod insertion tube portion 106b protrudes from the closed tube portion 104 and is positioned on the outer periphery of the second small diameter tube portion 105 as described above, the outer periphery of the wire group of the wire harness W / H from the distal end portion of the second small diameter tube portion 105. When the adhesive tape T is wound around, the wire rod insertion tube portion 106b located on the outer periphery obstructs the tape winding operation, which makes it difficult to perform the tape winding operation. And since it is necessary to tape-wrap the both ends of the length direction of a wire harness to two places, the 1st small diameter cylinder part 101 and the 2nd small diameter cylinder part 105, the adhesion work process of a grommet and a wire harness increases. There's a problem. And when a closed wall portion is provided at the large-diameter side end of the enlarged diameter cylindrical portion, a slit in the diametrical direction is provided in the closed wall portion, and the core to be loaded into the hollow portion of the enlarged diameter cylindrical portion when molding a grommet Although demolding is performed, the core demolding operation is not easy.

  However, if only the distal end side of the first small-diameter cylindrical portion 101 continuous to the small-diameter end side of the enlarged-diameter cylindrical portion 102 and the wire harness are tape-bonded and the tape winding portion is one place, the large-diameter cylindrical portion 102 has a large diameter. The shape retention force on the side is reduced. Therefore, there is a problem that the vehicle body locking concave portion 103 on the outer peripheral surface of the large diameter side of the enlarged diameter cylindrical portion 102 that locks with the through hole of the vehicle body panel is easily deformed, and the reliability of the water stop function is lowered.

JP 2003-111250 A

  The present invention has been made in view of the above problems, and the tape winding portion between the wire harness and the grommet is limited to the front end side of the small diameter cylindrical portion protruding from the small diameter end side of the enlarged diameter cylindrical portion, and the tape winding operation is not performed. In addition to eliminating the second small-diameter cylindrical portion, strengthening the shape retaining force on the large-diameter side of the enlarged-diameter cylindrical portion provided with a vehicle body locking recess that locks into the through hole of the vehicle body panel, and improving the reliability of the water stop function Is an issue.

In order to solve the above-mentioned problem, the present invention is made of rubber or elastomer that is locked to a through hole of a vehicle body panel in a state of being sheathed on a wire harness for an automobile,
A small-diameter cylindrical portion for tightly penetrating the wire harness, and tape-fixing only the tip of one side of the wire harness to the wire group;
A diameter-enlarging cylinder part that is continuous with the outer periphery of the intermediate part in the lengthwise direction of the small-diameter cylinder part and encloses the other side part of the small-diameter cylinder part; and
A vehicle body locking recess provided in an annular shape on the outer peripheral surface on the large diameter side of the expanded diameter cylindrical portion;
An inner rib provided at an interval in the circumferential direction connecting the inner periphery of the enlarged diameter cylindrical portion and the outer peripheral surface of the other side portion of the small diameter cylindrical portion;
Continuing to the wire rod through-hole provided in the diameter-expanded tube portion, the wire rod insertion tube portion protruding from the large-diameter side opening end through the inside of the diameter-expanded tube portion,
The inner rib is separated from the inner peripheral surface of the enlarged diameter cylindrical portion from the position where the inner peripheral surface of the through hole of the vehicle body panel and the enlarged diameter cylindrical portion are in contact with the position facing the vehicle body locking recess. Projecting, projecting the distal end portion of the other side portion of the small-diameter cylindrical portion from the distal end of the inner rib, and positioning the distal end of the small-diameter cylindrical portion at the large-diameter side opening end of the enlarged-diameter cylindrical portion. A grommet characterized by

  As described above, the grommet of the present invention winds the wire harness and adhesive tape of the wire harness only on the tip side of one side portion of the small-diameter cylindrical portion that protrudes outward continuously from the small-diameter end side of the large-diameter cylindrical portion. It is stuck. In addition, tape winding is not performed on the side where the wire insertion tube portion of the wire rod made of a washer hose or / and a hood opener cable protrudes, and the tape winding portion is a single location. Accordingly, the number of tape winding operations can be reduced, and the tape winding operation is eliminated on the side where the wire insertion tube portion protrudes, so that the tape winding fixing operation between the grommet and the wire harness can be simplified.

  In addition, an inner rib is provided to connect the outer peripheral surface of the other side portion of the small-diameter cylindrical portion inserted through the inside of the enlarged-diameter cylindrical portion and the inner peripheral surface of the enlarged-diameter cylindrical portion to the vicinity of the large-diameter side opening end. For this reason, it is possible to increase the shape retention force of the diameter-expanded cylindrical portion. And since the front-end | tip part of the small diameter cylinder part closely_contact | adhered to a wire harness protrudes from the front-end | tip of this inner rib, the shape retention force of a diameter expansion cylinder part is strengthened, and the vehicle body which fits in the through-hole of a vehicle body panel The deformation of the locking recess can be suppressed, and the reliability of the water stopping function can be enhanced.

  Further, the inner rib is separated from the inner peripheral surface of the enlarged diameter cylindrical portion by a gap from the position where the enlarged diameter cylindrical portion contacts the inner peripheral surface of the vehicle body panel to the position facing the vehicle body locking recess. When the vehicle body locking recess of the grommet is fitted into the through hole of the vehicle body panel, the enlarged diameter cylindrical portion can be smoothly deformed inward, and the insertion force can be reduced.

It is preferable that an interference wall protrudes from the large-diameter inner peripheral surface of the enlarged-diameter cylindrical portion at a position facing the front end surface of the inner rib with a gap.
The interference wall projecting from the large-diameter inner peripheral surface of the expanded-diameter cylindrical portion has a short radial dimension that is projected by a length that wraps with the distal end surface on the outer peripheral side of the inner rib, and is surrounded by the wall. The other end of the small-diameter cylindrical portion is positioned at the center of the open end.
Thus, when the interference wall is provided at a position facing the inner rib, when the vehicle body locking recess on the inner rib or the enlarged diameter cylindrical portion side is deformed, it is brought into contact with each other to suppress the deformation and increase the shape retaining force of the grommet, The water stop performance can be maintained.

On the outer peripheral surface of the enlarged diameter cylindrical portion facing the position where the inner rib is provided, a plurality of protruding step portions extending in the axial direction from the continuous end with the smaller diameter cylindrical portion to a position reaching the vehicle body locking recess. Provided,
A chevron rib projecting from the connection end on the outer surface of the protruding step portion from the connection end on the small-diameter cylindrical portion side to the contact position with the periphery of the through hole when inserted into the through hole of the vehicle body panel It is preferable that a groove in the axial direction is provided between the enlarged diameter cylindrical portion and the small diameter cylindrical portion where the chevron rib protrudes.

  As described above, when the grommet is provided with a plurality of projecting stepped portions extending in the axial direction from the small-diameter cylindrical portion to the vehicle body locking recess on the outer peripheral surface of the enlarged-diameter cylindrical portion, Since the contact area between the inner peripheral surface of the through hole and the outer surface of the protruding step is reduced, the insertion force for mounting the grommet in the through hole can be reduced.

And, as described above, from the connection end to the outer surface of the protrusion step portion from the connection end on the small diameter tube portion side to the contact position with the periphery of the through hole when inserted into the through hole of the vehicle body panel. Protruding chevron ribs are preferably provided.
The angle rib protrudes in a direction orthogonal to the axial direction from a continuous end with the small-diameter cylindrical portion, and has a shape including the inclined surface inclined toward the outer surface of the protruding step portion from the protruding end of the peak portion. .
The angle rib of the angle rib of the angle rib located on the lower side in a state where the small diameter cylindrical portion is inserted into the through hole of the vehicle body panel is held on the inner peripheral surface of the through hole, and the small diameter cylindrical portion is the other surface Temporary placement can be held until it is pulled in from the side, and the periphery of the through hole is set in contact with a position that does not exceed the vehicle body locking recess on the upper side with the lower side temporarily placed.

As described above, the protruding stepped portion is provided on the outer peripheral surface of the enlarged diameter cylindrical portion with a space in the circumferential direction, and the angle rib is further provided on the small diameter cylindrical portion connecting side of each protruding stepped portion. After the worker inserts the small-diameter cylindrical portion into the through hole of the vehicle body panel on one side (for example, the engine room side), the worker moves to the other side (for example, the vehicle compartment side) of the through hole. Even if the grommet is tilted by its own weight, the inclined surface of the angle rib located on the lower side is caught by the lower inner peripheral surface of the through hole, and the grommet is held temporarily until the grommet is pulled. Can do. That is, the chevron rib can be used as a temporary placing rib.
And, in order to hold the lower side in the temporarily placed state and the vehicle body locking recess not to pass through the through hole on the opposite upper side, the upper side during gripping and pulling the small diameter cylindrical part that has passed through the through hole It is possible to prevent a situation in which the positioned vehicle body locking recess does not fit into the through hole.

  Furthermore, since a chevron rib that easily interferes with the peripheral edge of the through hole is provided on the end side of the small diameter cylindrical part of the protrusion step part, it is inserted obliquely when inserted into the through hole of the vehicle body panel from the small diameter cylindrical part side. If the crest portion of the rib interferes with the peripheral edge of the through hole, the portion of the chevron rib that interfered when pulled from the other side does not come out into the through hole, so that the operator cannot insert the grommet. Therefore, it is noticed that the grommet is pulled in an oblique posture, and it is forced to make a straight posture in which all the chevron ribs do not interfere with the peripheral edge of the through hole, and oblique insertion can be reliably prevented.

Further, as described above, it is preferable that a groove is provided between the chevron rib and the outer surface of the small diameter cylindrical portion.
As described above, the angle rib protrudes from the end on the small diameter cylindrical portion side of the protruding step portion, but since the groove is provided between the outer peripheral surface of the small diameter cylindrical portion, the bending of the small diameter cylindrical portion is not restricted, Even when it is necessary to bend the small-diameter cylindrical portion abruptly, it can be easily bent without pulling the enlarged-diameter cylindrical portion.

It is preferable that the number of protrusions provided on the outer peripheral surface of the enlarged diameter cylindrical part and the number of inner ribs provided on the inner peripheral surface opposed to the protrusions are six or more. The circumferential width of these protrusions and the width of the inner rib are the same and extend in the axial direction.
In this way, since the circumferential width is the same and extends in the axial direction, the end of the ridge step on the small-diameter cylindrical portion side is adjacent to each other and expands radially, adjacent to each other. Between the protruding stepped portions (between adjacent inner ribs), a triangular recess formed by the outer peripheral surface of the enlarged diameter cylindrical portion is formed.
As described above, since the area of the thin hollow portion increases toward the vehicle body engagement concave portion side, it becomes easy to bend in the diameter reducing direction, and the insertion force can be reduced.
Further, as described above, a large number of 6 to 8 protruding step portions are provided, and when the chevron rib is provided on each protruding step portion, it is inserted into the through hole from the small diameter cylindrical portion side and temporarily placed. At this time, the angle ribs held in contact with the inner peripheral surface of the through hole can be increased, and can be temporarily placed and held in a stable state with the grommet.

  The wire insertion part provided in the said enlarged diameter cylinder part is provided in the said thin hollow part which does not provide the said protrusion step part and an inner side rib.

  According to the present invention, a tape winding operation is performed because the fixing portion where the grommet and the wire harness are taped is only one end of the small diameter cylindrical portion protruding from the small diameter end side of the large diameter cylindrical portion. The number of steps can be reduced, and the tape winding portion is not located at the tape winding portion and there is no obstacle to the tape winding operation, so that the tape winding operation is facilitated.

Further, the other side portion of the small-diameter cylindrical portion extending along the central axis of the large-diameter cylindrical portion is continued via the inner peripheral surface of the large-diameter cylindrical portion and the inner rib, and the inner rib is further expanded. By extending to the vicinity of the large-diameter side opening, the shape retaining force on the large-diameter side of the enlarged-diameter cylindrical portion can be strengthened, and deformation of the vehicle body locking recess that fits into the through hole of the vehicle body panel is suppressed. Yes, the water stop function can be enhanced.
The inner rib is separated from the position where the protruding stepped portion of the outer peripheral surface of the enlarged diameter cylindrical portion comes into contact with the inner peripheral surface of the through hole with a gap between the inner peripheral surface of the enlarged diameter cylindrical portion. Therefore, the insertion force of the grommet that fits the vehicle body locking recess into the through hole of the vehicle body panel can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
The grommet 1 according to the present embodiment has a wire harness W / routed from the engine room side (X) to the vehicle compartment side (Y) through the through hole H of the dash panel P, as in FIG. It adheres to H in advance.

The grommet 1 is integrally formed of rubber.
The grommet 1 has a small diameter cylindrical portion 2 for tightly penetrating the wire harness and fixing only the tip 2d of one side portion 2a thereof with a wire group of the wire harness W / H by tape winding,
A diameter-enlarging cylindrical part 3 that is continuous with the outer periphery of the intermediate part in the length direction of the small-diameter cylindrical part 2 and that expands the diameter around the other side 2b of the small-diameter cylindrical part 2;
A vehicle body locking recess 4 provided in an annular shape on the outer peripheral surface on the large-diameter side of the enlarged-diameter cylindrical portion 3;
An inner rib 5 provided at an interval in the circumferential direction connecting the inner periphery of the enlarged diameter cylindrical portion 3 and the outer peripheral surface of the other side portion 2b of the small diameter cylindrical portion 2;
A projecting stepped portion 6 provided on the outer peripheral surface of the enlarged diameter cylindrical portion 3 and at a position facing the inner rib 5;
It protrudes from the large diameter side opening 3a through the inside of the enlarged diameter cylindrical portion 3 continuously to the wire through hole 7a formed in the portion where the protruding step portion 6 and the inner rib 5 of the enlarged diameter cylindrical portion 3 are not provided. It has a pair of insertion tube portions 7 for wire rods.

The small-diameter cylindrical portion 2 is formed by dividing the distal end side of the one side portion 2a protruding from the small-diameter side of the enlarged-diameter cylindrical portion 3, and circumferential ribs 2d and 2e are provided at the distal end and the base end position. Between 2e is a tape winding part.
Also, ribs 2f are provided on the inner peripheral surface of the other side portion 2b extending into the enlarged diameter cylindrical portion 3 at intervals in the axial direction to improve the adhesion to the wire harness inserted into the smaller diameter cylindrical portion 2. ing.

  Both side walls of the vehicle body locking recess 4 are composed of a first wall 4a on the side of the tip thick part 3b and a second wall 4c on the side of the enlarged diameter cylinder part 3 facing each other across the groove 4b. 4a has a high protruding amount from the bottom surface of the groove 4b, the second wall 4c is low, and the height is changed. A lip 4e for pressure contact is provided on the bottom surface of the groove 14b.

The protruding step 6 provided on the outer peripheral surface of the enlarged diameter cylindrical portion 3 is spaced from the small diameter side on the continuous side with the small diameter cylindrical portion 2 to the tip of the second wall 4c of the vehicle body locking recess 4 with a space in the circumferential direction. It extends in the axial direction and protrudes from the outer peripheral surface of the enlarged diameter cylindrical portion 3 in a stepped manner.
In the present embodiment, eight ridge step portions 6 are provided, each ridge step portion 6 has the same shape, the circumferential width W is the same, and the second locking portion 4 of the vehicle body locking recess 4 is connected to the small-diameter cylindrical portion connection end P1. It extends in the axial direction to the front end point P4 of the wall 4c, and is provided radially on the outer peripheral surface of the enlarged diameter cylindrical portion 3.

On the outer surface 6a of each protruding step 6 between the small diameter cylindrical portion connecting end P1 and the through hole H of the vehicle body panel P, until the contact position P3 with the inner peripheral surface Ha of the through hole H, Yamagata ribs 9 are projected. The chevron rib 9 has a flat projecting surface 9a projecting from the base end P1 in a direction Z perpendicular to the central axis L of the grommet 1, and a peak 9b at the tip of the flat projecting surface 9a toward the outer surface 6a of the ridge step portion 6. And an inclined surface 9c which is inclined. The inclined surface 9c becomes a temporary placement surface during insertion from one side into the through-hole H and during pulling from the other side.
A groove 11 extending in the axial direction is provided between the small-diameter cylindrical portion 2 and the small-diameter cylindrical portion connecting end P <b> 1 of the projecting step portion 6 provided with the chevron rib 9. That is, the back end of the groove 11 becomes the small-diameter cylindrical portion connecting end P1.

The inner rib 5 provided opposite to the protruding step 6 is connected to the inner peripheral surface of the enlarged diameter cylindrical portion 3 and the outer peripheral surface of the smaller diameter cylindrical portion 3 at a position facing the chevron rib 9. Part 5a. The inner rib 5 is separated from the inner peripheral surface of the enlarged diameter cylindrical portion 3 on the tip side of the inclined surface 9c of the chevron rib 9, and is connected only to the outer peripheral surface of the small diameter cylindrical portion 2, and has a large diameter parallel to the axial direction L. It becomes the isolation | separation part 5b which protrudes to the side opening side.
The separation portion 5 b protrudes to the inner peripheral side of the vehicle body locking recess 4, and a gap C 1 is formed between the separation portion 5 b and the inner peripheral surface of the enlarged diameter cylindrical portion 3.
The protruding end surface 5c of the separating portion 5b is a surface orthogonal to the central axis L, and the distal end portion 2c on the other side of the small diameter cylindrical portion 2 protrudes from the center of the protruding end 5c.

An annular interference wall 10 protrudes from the inner peripheral surface of the enlarged-diameter cylindrical portion 3 with a gap C <b> 2 from the front end side of the protruding end surface 5 c of the inner rib 5. The protruding amount of the interference wall 10 in the inner diameter direction is made small so that it can overlap the outer peripheral side of the protruding end surface 5c.
The distal end portion 2 of the small diameter cylindrical portion 2 is located at the center of the large diameter side opening 3a of the enlarged diameter cylindrical portion 3 surrounded by the annular interference wall 10, and the wire rod is inserted into the outer peripheral side of the distal end portion 2. The cylinder part 7 is located and protrudes outward.

  Between the protruding step portions 6 that radially extend on the outer peripheral side of the diameter-enlarging cylindrical portion 3 (between the inner ribs 5 that extend radially on the inner peripheral side), a triangular shape is formed toward the large-diameter side. The thin hollow part 12 which spreads exists, the through-hole 7a for wire mentioned above is provided in this hollow part 12, and the wire insertion cylinder part 7 is protrudingly provided from the periphery of this through-hole 7a for wire. In addition, an axial center groove 12 a is provided at the center of each recess 12 in the circumferential direction.

The wire harness W / H is attached to the grommet 1 by expanding the small-diameter cylindrical portion 2 with a jig (not shown) and inserting the wire group of the wire harness W / H. As shown in FIG. 6, an adhesive tape is attached to the distal end portion of one side portion 2 a of the small-diameter cylindrical portion 2 that protrudes outward from the small-diameter side of the enlarged-diameter cylindrical portion 3 after insertion, and to the outer periphery of the electric wire group drawn from the distal end portion. 20 is wound and fixed. The winding area of the adhesive tape 20 is between the ribs 2d and 2e.
On the other hand, the tip 2c of the other side 2b of the small-diameter cylindrical portion 2 is only in close contact with the outer peripheral surface of the electric wire group, and is not wound with tape.
Moreover, the front-end | tip closing part of the wire rod insertion cylinder part 7 is cut | disconnected, and the washer hose 22 and the hood opener cable 23 are penetrated.

  A method of mounting the grommet 1 attached to the wire harness W / H in the through hole H of the vehicle body panel P including a dash panel that partitions the engine room side (X) and the indoor side (Y) of the automobile will be described.

  The small diameter cylindrical portion 2 is inserted into the through hole H from the engine room side (X). At this time, as shown in FIG. 6 (A), when the central axis L of the grommet 1 coincides with the central axis S0 of the through hole H and the insertion posture of the grommet 1 is straight, as shown in FIG. 6 (B). In addition, the chevron rib 9 does not interfere with the periphery of the through hole H, and all the chevron ribs 9 can pass through the through hole H.

After the operator passes the one side 2a of the small-diameter cylindrical portion 2 and the angle rib 9 from the engine room side (X) through the through hole H, the operator moves to the vehicle compartment side (Y) and penetrates the through hole H. Then, the one side portion 2a of the small-diameter cylindrical portion 2 protruding toward the passenger compartment side (Y) is gripped and pulled, and the grommet 1 is pulled into the passenger compartment side.
After the one side portion 2a of the small diameter cylindrical portion is inserted into the through hole H on the engine room side (X), the inserted grommet 1 is moved until the operator moves and pulls to the passenger compartment side (Y). The wire harness W / that is not tightly fitted and held in the through-hole H and is drawn out from both ends of the grommet 1 because it is not inserted up to the contact point of the protruding step portion 6 that is the same as the inner diameter of the through-hole H. It is held by H and is left in the state of passing through the through hole H.
During this period, even if the center axis L of the grommet 1 coincides with the center axis S0 of the through hole H and the insertion posture of the grommet 1 is inserted straight into the through hole H as shown in FIG. Since the outer peripheral surface of 1 is not yet in a state of being tightly fitted and held on the inner peripheral surface of the vehicle body through-hole H, it may be inclined due to its own weight.

In this case, the inclined surface 9c of the chevron rib 9 positioned on the lower peripheral edge of the grommet 1 is placed on the upper surface of the inner peripheral surface Ha of the through hole H, the grommet 1 is temporarily placed, and the grommet 1 has a larger angle. Inclination can be suppressed. In the temporarily held state, the upper peripheral edge of the grommet 1 can maintain a state in which the inner peripheral surface Ha of the through hole H is in contact with the protruding step portion 6 on the outer peripheral surface on the small diameter side that does not get over the vehicle body locking recess 4. . That is, it is possible to prevent the upper vehicle body locking recess 4 from passing through the through hole H and coming out to the vehicle compartment side (Y).
On the other hand, when the central axis L of the grommet 1 is inclined obliquely with a large deviation from the central axis S0 of the through hole H, the flat protruding surfaces 9a of some of the chevron ribs 9 interfere with the peripheral edge of the through hole H, and pass through. It cannot pass through the hole H and cannot be inserted. Therefore, in order to prevent the flat projecting surface 9a of the chevron rib 9 from interfering with the peripheral edge of the through hole H, the insertion posture of the grommet 1 inserted from an oblique direction must be changed to a straight direction, Insertion can be prevented.

As described above, after inserting the one side portion 2a of the small-diameter cylindrical portion 2 from the engine room side (X) into the through hole H, the worker moves to the vehicle compartment side (Y), and the vehicle compartment side (Y). When the one side portion 2a protruding from the small diameter cylindrical portion 2 is gripped and the pulling operation is performed, the inclined surface 9c of the lower chevron rib 9 is formed on the inner peripheral surface Ha of the through hole H as shown in FIG. Pulling is performed from the state of being placed and temporarily placed.
The inclined surface 9c of the lower chevron rib 9 is placed on the lower inner peripheral surface Ha of the through hole during the pulling operation, and the inclined surface 9c is a protrusion on the diameter-enlarged side on the vehicle body locking recess 4 side. Since the surface of the stepped portion 6 is inclined and continuous, the grommet 1 slides down on the inclined surface 9c according to the pulling operation and the inner peripheral surface Ha of the through hole smoothly contacts the outer surface of the protruding stepped portion 6. .

  When the grommet 1 is pulled from the passenger compartment side (Y), the diameter-expanded cylindrical portion 3 of the grommet 1 passes through the through hole H and reaches the contact point of the protruding step portion 6 that is the same as the inner diameter of the through hole H. Then, from this point in time, the operator pushes the grommet 1 at a stretch, and passes it through the through hole H so as to crush the protruding step 6. At this time, the inner rib 5 connected to the inner peripheral surface of the enlarged diameter cylindrical portion 3 is separated from the inner peripheral surface of the enlarged diameter cylindrical portion 3 so that a gap C1 exists, and a recess between the protruding stepped portions 6 exists. Since the groove 12 a is provided in the portion 12, the hollow portion 12 is smoothly reduced in diameter, can be pushed in with a low insertion force without requiring a large pushing force, and the vehicle body locking recess 4 is formed in the through hole H of the vehicle body panel P. Can be fitted.

  As described above, in the state where the grommet 1 is attached to the vehicle body panel P, the enlarged diameter cylindrical portion 3 provided with the vehicle body locking recess 4 of the grommet 1 is connected to the wire harness W / H on one side 2a of the small diameter cylindrical portion 2. Although only the front end side is fixed with the adhesive tape 20, the inner rib 5 connects the outer peripheral surface of the other side portion 2 b of the small diameter cylindrical portion 2 and the inner peripheral surface of the enlarged diameter cylindrical portion 3. The shape retention force of the diameter-enlarged cylindrical portion 3 is strengthened, and the state where the vehicle body locking recess 4 is in close contact with the inner peripheral surface of the through hole P can be maintained without being deformed, and the water stop performance can be maintained.

  The inner rib 5 in the enlarged diameter cylindrical portion 3 is separated from the inner peripheral surface of the enlarged diameter cylindrical portion 3 on the side of the vehicle body locking recess 4, but is close to the large diameter side opening 3 a of the enlarged diameter cylindrical portion 3. The distal end portion 2c of the small-diameter cylindrical portion 2 protrudes from the protruding end surface 5c of the inner rib 5. Since the small diameter cylindrical portion 2 is in close contact with the electric wire group and is held by the electric wire group, the inner rib 5 is not deformed, and the connecting portion 5a integrated with the separation portion 5b of the inner rib 5 is connected to the enlarged diameter cylindrical portion 3. Since it is connected to the inner peripheral surface, the shape retention force of the enlarged diameter cylindrical portion 3 can be increased.

  Further, since the protruding end surface 5c of the separating portion 5b of the inner rib 5 and the annular interference wall 10 protruding from the inner peripheral surface of the enlarged diameter cylindrical portion 3 are overlapped with a gap C2, the small diameter cylindrical portion 2 When the second wall 4c of the vehicle body locking recess 4 tries to deform away from the peripheral edge of the through hole H as shown in FIG. 8, the protruding end surface 5c of the inner rib 5 interferes with the interference wall 10. Thus, deformation can be prevented. Thereby, the 1st, 2nd wall 4a, 4c of the vehicle body latching recessed part 4 can be closely_contact | adhered to the periphery of the through-hole H, and water stop performance can be improved.

  As described above, the grommet 1 is fixed to the wire harness with the adhesive tape 20 only at one end side of the small-diameter cylindrical portion 2, but the small-diameter portion is formed in the hollow portion on the large-diameter side of the large-diameter cylindrical portion 3 provided with the vehicle body locking recess 4. Since the other side portion 2b of the cylindrical portion 2 extends to the opening end and the other side portion 2b and the inner peripheral surface of the enlarged diameter cylindrical portion 3 are connected by the inner rib 5, the vehicle body locking recess 4 The shape retention force on the large diameter side of the expanded diameter cylindrical portion 3 provided with the height can be increased, and the water stop performance can be maintained.

The grommet of the present invention is not limited to the above-described embodiment, and it is not necessary to provide the chevron ribs on the protruding step portion provided on the outer peripheral surface of the enlarged diameter cylindrical portion. Furthermore, it is good also as a structure which does not provide the protrusion step part itself.
That is, the tape winding fixing part between the grommet and the wire harness is only the distal end side of the small diameter cylindrical part protruding from the small diameter end side of the large diameter cylindrical part, and the small diameter cylindrical part is the hollow part of the large diameter cylindrical part on the large diameter side Extending to the open end, connecting the outer peripheral surface of the small-diameter cylindrical portion and the inner peripheral surface of the enlarged-diameter cylindrical portion with an inner rib to increase the shape retaining force of the enlarged-diameter cylindrical portion, It is sufficient if deformation can be suppressed in a direction away from the peripheral edge of the through hole.

It is a perspective view of the grommet of an embodiment of the present invention. It is sectional drawing of the axial direction of the said grommet. It is sectional drawing of the said grommet of an axis perpendicular direction. It is a partially expanded sectional view of FIG. It is a partially expanded sectional view of FIG. (A) (B) It is drawing which shows the state which inserts and attaches a wire harness to a grommet, and it penetrates in the through-hole of a vehicle body panel. It is explanatory drawing of the temporary placement state between after the grommet insertion operation and before the pulling operation. It is explanatory drawing when a load acts on a grommet. It is drawing which shows the conventional grommet.

Explanation of symbols

P Body panel H Through hole 1 Grommet 2 Small diameter cylindrical part 2a One side part 2b The other side part
DESCRIPTION OF SYMBOLS 3 Diameter expansion cylinder part 4 Car body latching recessed part 5 Inner rib 6 Projection step part 7 Wire rod insertion cylinder part 10 Interference wall

Claims (4)

It is made of rubber or elastomer that is locked to the through hole of the vehicle body panel in a state where it is packaged on a wire harness for an automobile,
A small-diameter cylindrical portion for tightly penetrating the wire harness, and tape-fixing only the tip of one side of the wire harness to the wire group;
A diameter-enlarging cylinder part that is continuous with the outer periphery of the intermediate part in the lengthwise direction of the small-diameter cylinder part and encloses the other side part of the small-diameter cylinder part; and
A vehicle body locking recess provided in an annular shape on the outer peripheral surface on the large diameter side of the expanded diameter cylindrical portion;
An inner rib provided at an interval in the circumferential direction connecting the inner periphery of the enlarged diameter cylindrical portion and the outer peripheral surface of the other side portion of the small diameter cylindrical portion;
Continuing to the through hole for a wire provided in the enlarged diameter cylindrical portion, the wire insertion tube portion protruding from the large diameter side opening end through the inside of the enlarged diameter cylindrical portion,
The inner rib is separated from the inner peripheral surface of the enlarged diameter cylindrical portion from the position where the inner peripheral surface of the through hole of the vehicle body panel and the enlarged diameter cylindrical portion are in contact with the position facing the vehicle body locking recess. Projecting, projecting the distal end portion of the other side portion of the small-diameter cylindrical portion from the distal end of the inner rib, and positioning the distal end of the small-diameter cylindrical portion at the large-diameter side opening end of the enlarged-diameter cylindrical portion. Grommet characterized by.   The grommet according to claim 1, wherein an interference wall protrudes from a large-diameter side inner peripheral surface of the enlarged-diameter cylindrical portion at a position facing the front end surface of the inner rib with a gap. On the outer peripheral surface of the enlarged diameter cylindrical portion facing the position where the inner rib is provided, a plurality of protruding step portions extending in the axial direction from the continuous end with the smaller diameter cylindrical portion to a position reaching the vehicle body locking recess. Provided,
A chevron rib projecting from the connection end on the outer surface of the protruding step portion from the connection end on the small-diameter cylindrical portion side to the contact position with the periphery of the through hole when inserted into the through hole of the vehicle body panel The grommet according to claim 1 or 2, wherein a groove in an axial direction is provided between the enlarged-diameter cylindrical portion and the small-diameter cylindrical portion where the chevron rib protrudes.   4. The grommet according to claim 2, wherein six or more inner ribs are provided on the protrusion step provided on the outer peripheral surface of the enlarged diameter cylindrical portion and the inner peripheral surface opposed to the protrusion step.

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