JP6342726B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet that is externally mounted on a wire harness that spans between a vehicle body panel and a movable panel of an automobile.

  Conventionally, a wire harness is bridged between a vehicle body panel and a movable panel such as a door or a trunk lid that is hinged to be openable and closable with respect to the vehicle body panel. Grommets are installed for protection, dustproofing and waterproofing purposes. Such a grommet is, as described in JP 2010-182501 A (Patent Document 1), a bellows-like cylindrical part in which a wire harness is inserted and arranged so that a peak part and a valley part are continuously formed, and the bellows-like shape. It is comprised including a pair of fitting cylinder part which is connected with the through-hole respectively connected with the both ends of the cylinder part, and was each provided in the vehicle body panel and the movable panel.

  By the way, in such a grommet, the length of the bellows-like cylindrical portion is secured in accordance with the maximum dimension of the wire harness. Specifically, the length dimension which can accommodate the maximum dimension of the wire harness when the movable panel is positioned at the open position end where the movable panel is rotated to the maximum is secured. Therefore, when the movable panel is disposed at the closed position with respect to the vehicle body panel, the separation distance between the pair of fitting tube portions provided at both ends of the bellows-like tube portion is minimized, and the bellows-like tube Extra length will occur in the part.

  Therefore, when the movable panel is rotated from the open position end to the closed position with respect to the vehicle body panel, the bellows-like tube portion is easily bent due to the extra length, and the movable panels are brought into close contact with each other in the closed position. The bellows-shaped tube portion is sandwiched between the end edge portion of the vehicle body and the end edge portion of the vehicle body panel, which may cause damage to the wire harness.

  On the other hand, in patent document 1, the peak part of a bellows-like cylinder part is comprised by the large diameter peak part and the small diameter peak part, and the site | part which provided the large diameter peak part is bent rather than the site | part which provided the small diameter peak part. Utilizing the high ease, the bellows-like cylindrical portion is bent in a desired direction to prevent the bellows-like cylindrical portion from being sandwiched between the edge of the movable panel and the edge of the vehicle body panel. A structure has been proposed.

  However, such a conventional structure merely promotes bending in a desired direction using the bendability of the bellows-like tube portion, and is not a reliable preventive measure. That is, for example, in the case where the wire harness that passes through the inside of the bellows-like cylindrical portion has a bending fold, the wire harness is bent in the direction of the bending fold exceeding the difference in bendability. There was a case.

JP 2010-182501 A

  The present invention has been made in the background of the above-described circumstances, and the problem to be solved is that a bellows-like cylindrical portion is reliably provided between the edge of the movable panel and the edge of the vehicle body panel with a simple structure. An object of the present invention is to provide a grommet having a novel structure capable of preventing pinching.

According to a first aspect of the present invention, there is provided a grommet sheathed on a wire harness that spans between a vehicle body panel and a movable panel that is hinged to the vehicle body panel so as to be openable and closable. A bellows-like tube portion in which a harness is inserted and disposed, and a pair of fitting tube portions that are connected to both end portions of the bellows-like tube portion and are fitted and mounted in through holes provided in the vehicle body panel and the movable panel, respectively. If the provided protruding on the outer peripheral surface of the bellows-like cylindrical portion, wherein when the movable panel is rotated toward the closed position relative to the vehicle body panel, before Symbol abuts against the vehicle body panel , in a direction away from between the end edge of the edge portion of the vehicle body panel edge portion of the movable panel the bellows-shaped tubular portion by the contact reaction force caused by the abutment approaches and the movable panel A contact pressing portion for pressing, Characterized in that are Nde.

  According to this aspect, since the contact pressing portion that protrudes on the outer peripheral surface of the bellows-like cylindrical portion is provided, the contact is made when the movable panel is rotated toward the closed position with respect to the vehicle body panel. The pressing portion comes into contact with the end edge portion of the vehicle body panel before the bellows-shaped tube portion. The bellows-like cylindrical portion is pressed in a direction away from the end edge portion of the vehicle body panel by the contact reaction force generated by the contact of the contact pressing portion with the vehicle body panel. In such a state, the movable panel is rotated to the closed position with respect to the vehicle body panel, so that the bellows-like tube portion enters between and is held between the edge of the movable panel and the edge of the vehicle body panel. Can be reliably prevented. In particular, since the contact reaction force generated by the contact of the contact pressing part with the vehicle body panel is used, compared to the case of using the ease of bending deformation of the bellows-like cylindrical part as in the prior art. Even if the electric wire has a bending wrinkle, it is possible to reliably displace the bellows-like tube portion in a direction away from the end edge portion of the vehicle body panel using a large contact reaction force.

  In addition, as the movable panel is turned toward the closed position, the contact pressing portion is brought into contact with the end edge portion of the vehicle body panel, and the contact reaction force is used to attach the bellows-like cylindrical portion to the end edge of the vehicle body panel. Since it can be pressed in a direction away from the part, it can move reliably with the body panel of the bellows-like cylindrical part only by closing the movable panel without requiring any special action or force. It is possible to prevent pinching between the edge portions of the panel.

  According to a second aspect of the present invention, in the one described in the first aspect, the abutment pressing portion projects in a fan shape from a partial region in the circumferential direction on the outer peripheral surface of the bellows-like cylindrical portion. And the arcuate end surface of the fan-shaped protrusion of the abutting pressing portion is in the state of the vehicle body panel in a state where the movable panel is held at the open position end with respect to the vehicle body panel. It is adapted to face the end edge side.

  According to this aspect, the arcuate end surface of the fan-shaped protrusion is the vehicle body in a state where the contact pressing portion includes the fan-shaped protrusion and the movable panel is held at the open position end that is the maximum open position with respect to the vehicle body panel. It faces the edge side of the panel. Therefore, when the movable panel is rotated toward the closed position with respect to the vehicle body panel, the abutting pressing portion is more reliable at the arc-shaped end surface of the fan-shaped protrusion that extends over a wider range than the bellows-shaped cylindrical portion. It can contact | abut to the edge part of a vehicle body panel.

  In addition, since the arc-shaped end surface of the fan-shaped protrusion of the contact pressing part contacts the end edge of the vehicle body panel, the force applied from the movable panel side to the contact pressing part as the movable panel rotates. Thus, it can be converted into a rotational force centered on the contact portion of the contact pressing portion with the edge portion of the vehicle body panel. By utilizing this rotational force, the bellows-like cylindrical portion can be further displaced to the side away from the edge of the vehicle body panel, and between the edge of the movable panel of the bellows-like cylindrical portion and the edge of the vehicle body panel. Can be more reliably prevented. In addition, the arcuate end surface of the fan-shaped cylindrical portion can smoothly remove the contact pressing portion from the end edge portion of the vehicle body panel.

  According to a third aspect of the present invention, in the above-described second aspect, the other region in the circumferential direction on the outer peripheral surface of the bellows-shaped tube portion that is not provided with the fan-shaped protrusion is the An annular portion protruding in an annular shape is provided along the outer peripheral surface of the bellows-like cylindrical portion.

  According to this aspect, since the annular portion is provided in the region of the bellows-like cylindrical portion located on the opposite side of the fan-shaped projection that directly contacts the edge of the vehicle body panel, the ring-shaped portion is in contact with the bellows-like cylindrical portion. The rigidity of the part where the reaction force is exerted is ensured. Thereby, the durability of the grommet can be improved.

  According to the present invention, when the movable panel is rotated toward the closed position with respect to the vehicle body panel, the contact pressing portion comes into contact with the end edge portion of the vehicle body panel before the bellows-like cylindrical portion. By pressing the cylinder part away from the edge of the body panel, it is ensured that the bellows-like cylinder part enters between the edge of the movable panel and the edge of the body panel. Can be prevented. In particular, since the contact reaction force generated by the contact of the contact pressing part with the vehicle body panel is used, compared to the case of using the ease of bending deformation of the bellows-like cylindrical part as in the prior art. Thus, even if the electric wire has a bending wrinkle, it can be reliably displaced in a direction away from the end edge portion of the vehicle body panel. In addition, it is possible to reliably prevent the bellows-like cylindrical portion from being sandwiched between the vehicle body panel and the edge of the movable panel only by closing the movable panel without requiring any special operation or force.

The side view of the grommet as one embodiment of the present invention. II-II cross-sectional enlarged view in FIG. Explanatory drawing which shows the assembly | attachment state to the back door of the grommet shown in FIG. 1 (a back door is an open position). FIG. 4 is a view (indicated by an arrow A in FIG. 3) showing the assembled state of the grommet shown in FIG. 3, and is a diagram for explaining the behavior of the grommet when the back door is rotated toward the closed position.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG.1 and FIG.2 shows the state where the grommet 10 as one embodiment of the present invention is sheathed on the wire harness 12. FIG. The grommets 10 are respectively provided on a bellows-like cylindrical portion 14 through which the wire harness 12 is inserted and connected to both ends of the bellows-like cylindrical portion 14 and a vehicle body panel 40 described later and a door panel 42 of a back door which is a movable panel. And a pair of fitting cylinders 16a and 16b fitted and mounted in the through holes 41 and 43, respectively, and a contact pressing part 18 provided protruding from the outer peripheral surface of the bellows-like cylinder part 14. It is integrally formed of a rubber material such as EPDM (ethylene propylene rubber), CR (chloroprene rubber), SI (silicone rubber). In order to facilitate understanding, the wire harness 12 is indicated by virtual lines. In the following description, the front means the left in FIG. 1, the rear means the right in FIG. 1, and the upper means the upper in FIG. 2, and the lower means the lower in FIG. Say it.

  The bellows-shaped cylindrical portion 14 has a bellows shape and can be expanded and contracted and bent. Further, shape holding cylinder portions 20a and 20b are formed on both sides of the bellows-like cylinder portion 14, and the bellows-like cylinder portion 14 and the pair of fitting cylinder portions 16a and 16b are provided via the shape holding cylinder portions 20a and 20b. Are connected to each other. The shape-holding cylindrical portions 20a and 20b are formed in a cylindrical shape extending in a straight line with a substantially constant cross-sectional shape, and the shape is not easily changed by being formed thicker than the bellows-shaped cylindrical portion 14. Has been. In addition, the length dimension of the shape holding cylinder part 20a is made larger than that of the shape holding cylinder part 20b.

  In addition, an abutment pressing portion 18 having a substantially annular flat plate shape protrudes from an intermediate portion of the bellows-like cylindrical portion 14 and an outer peripheral surface slightly forward (leftward in FIG. 1). The contact pressing portion 18 is a fan-shaped protrusion that protrudes in a fan shape from a partial region in the circumferential direction on the outer peripheral surface of the bellows-shaped cylindrical portion 14, that is, a region covering a substantially half circumference on the upper left in the front view (see FIG. 2). A portion 22 is provided. Further, in a region extending over the other substantially half circumference in the circumferential direction on the outer peripheral surface of the bellows-like cylindrical portion 14 where the fan-shaped protrusion 22 is not provided, the ring-like projection is projected along the outer peripheral surface of the bellows-like cylindrical portion 14. An annular portion 24 is provided. As shown in FIG. 2, the length dimension L1 of the arcuate end surface 26 of the fan-shaped protrusion 22 is larger than the diameter dimension L2 of the bellows-shaped cylindrical portion 14.

  The pair of fitting tube portions 16a and 16b are formed into a cylindrical shape as a whole, and the fitting tube portion 16a is opened upward in the axial direction of the bellows-like tube portion 14, while the fitting tube portion 16b is The bellows-like cylindrical portion 14 is opened obliquely downward and forward in the axial direction. Since the fitting tube portions 16a and 16b have substantially the same structure except for the fixing pieces 34a and 34b described later, common structures are denoted by the same reference numerals in the drawing and fitted. A description will be given by taking the combination tube portion 16a as an example.

  The fitting cylinder portion 16 a includes a pedestal portion 28 and a fitting portion 30 that protrudes from the pedestal portion 28. The pedestal portion 28 has an oval shape with an outer shape in plan view, while the fitting portion 30 has an oval shape with an oval shape that is slightly smaller than the pedestal portion 28 in plan view. Has been. In addition, the fitting part 30 is made into the reverse taper shape which narrows toward the base part 28 in the protrusion base end part from the base part 28. As shown in FIG. Thereby, a fitting groove 32 is formed at the base end portion of the fitting portion 30.

  A fixed piece 34a having a substantially long rectangular protrusion shape protrudes obliquely forward at the central portion in the axial direction (left and right direction in FIG. 1) of the protruding tip portion of the fitting portion 30 of the fitting cylinder portion 16a. It is installed. A pair of tape positioning ribs 36 and 36 are formed at the protruding tip end and the protruding base end of the fixed piece 34a. The pair of tape positioning ribs 36, 36 protrudes from the outer surface of the fixed piece 34a and is formed over the entire width of the fixed piece 34a, and is formed in parallel to each other with a predetermined interval in the protruding direction of the fixed piece 34a. ing. On the other hand, a fixed piece 34b having a substantially longitudinal rectangular protruding piece shape is also formed obliquely forward and downward at a central portion in the axial direction (in the depth direction in FIG. 1) of the protruding tip portion of the fitting portion 30 of the fitting cylinder portion 16b. It protrudes toward. The fixed piece 34b has a tape positioning rib 36 formed only at the protruding tip edge (see FIG. 1).

  And in each of a pair of fitting cylinder part 16a, 16b, the wire harness 12 is piled up on fixing piece 34a, 34b, and taped with the tape which is not shown in figure with fixing piece 34a, 34b, fixed piece 34a, It fixes to 34b and the routing route of the wire harness 12 is controlled. The tape positioning ribs 36 formed at the tips of the fixed pieces 34a and 34b prevent the unillustrated tape from coming off from the fixed pieces 34a and 34b. In particular, the fixed piece 34a can be easily positioned between the pair of tape positioning ribs 36 and 36 and wound with the tape. Further, when the wire harness 12 is pulled into the bellows-like cylindrical portion 14, a tape (not shown) is locked by the tape positioning rib 36 on the base end side (fitting portion 30 side), whereby the wire harness 12 The fixing force can be obtained more firmly.

  Such a grommet 10 is assembled to a vehicle as shown in FIG. 3 with the wire harness 12 inserted. FIG. 3 is a view of the open state of the back door as viewed from the rear of the vehicle body. The grommet 10 is configured such that the fitting portion 30 of the fitting cylinder portion 16a is inserted into a through hole 41 penetrating the vehicle body panel 40 of the automobile, and the vehicle body panel 40 is engaged with the fitting groove 32. It is attached to the vehicle body panel 40. On the other hand, with respect to the door panel 42 of the back door which is a movable panel, the fitting part 30 of the fitting cylinder part 16b is inserted into a through hole 43 penetrating the door panel 42, whereby the door panel 42 is fitted to the fitting cylinder part. It is engaged with the fitting groove 32 of 16 b and is attached to the door panel 42. In this way, the grommet 10 is disposed so as to be spanned between the vehicle body panel 40 and the door panel 42 of the back door. The door panel 42 is hinged to the vehicle body panel 40 by a hinge mechanism (not shown) so as to be freely opened and closed. Further, in a state where the door panel 42 is held at the open position end which is the maximum open position with respect to the vehicle body panel 40 (see FIG. 3), the arcuate end surface 26 of the fan-shaped protrusion 22 of the contact pressing portion 18 is The grommet 10 is assembled with respect to the vehicle body panel 40 and the door panel 42 so as to face the end edge portion 44 side of the 40.

  Next, the grommet 10 disposed between the vehicle body panel 40 and the door panel 42 in this way is in a state where the door panel 42 is held at the open position end with respect to the vehicle body panel 40 (see FIG. 3) toward the closed position. A description will be given of what kind of movement is shown with reference to FIG. When the door panel 42 is rotated toward the closed position with respect to the vehicle body panel 40, first, as shown in FIG. 4A, the arcuate end surface 26 of the fan-shaped protrusion 22 of the contact pressing portion 18 is moved to the vehicle body. It abuts against the edge 44 of the panel 40. That is, in a state where the door panel 42 is held at the open position end with respect to the vehicle body panel 40 (see FIG. 3), the arc-shaped end surface 26 of the fan-like protrusion 22 of the contact pressing portion 18 is the edge 44 of the vehicle body panel 40. Since the arc-shaped end surface 26 of the fan-shaped protrusion 22 is configured to extend over a wider range than the bellows-shaped cylindrical portion 14 (L1> L2 in FIG. 2), The contact pressing portion 18 is reliably brought into contact with the end edge portion 44 of the vehicle body panel 40. In addition, since the annular portion 24 is provided in the region of the bellows-like cylindrical portion 14 located on the side opposite to the fan-shaped protrusion 22, the rigidity of the portion where the contact reaction force is exerted on the bellows-like cylindrical portion 14 is increased. The durability of the grommet 10 is improved.

Subsequently, when the door panel 42 is rotated, as shown in FIG. 4B, the bellows-like cylindrical portion 14 is separated from the end edge portion 44 of the vehicle body panel 40 by the contact reaction force generated by the contact. Pressed in the direction. When the door panel 42 is further rotated, as shown in FIG. 4C, the bellows-like cylindrical portion 14 is further separated from the end edge portion 44 of the vehicle body panel 40 by the contact reaction force generated by the contact. It is pressed in the direction to do. In short, since the arc-shaped end face 26 of the fan-shaped protrusion 22 of the contact pressing portion 18 is in contact with the vehicle body panel 40, as shown in FIGS. Since the force applied from the door panel 42 side to the contact pressing portion 18 with the rotation can be converted into a rotational force centered on the contact portion of the contact pressing portion 18 with the vehicle body panel 40. is there. Therefore, the bellows-like cylindrical portion 14 can be further displaced to the side away from the end edge portion 44 of the vehicle body panel 40 by using such rotational force. In addition, as shown in FIGS. 4A and 4B, the arcuate end surface 26 of the fan-shaped protrusion 22 causes the contact pressing portion 18 to be detached from the end edge portion 44 of the vehicle body panel 40. Can be done smoothly.

  As a result of the above, finally, as shown in FIG. 4D, the door panel 42 is held in the closed position with respect to the vehicle body panel 40, that is, the end edge 46 of the door panel 42 is the end of the vehicle body panel 40. It is possible to prevent the bellows-like tube portion 14 from entering between the end edge portion 46 of the door panel 42 and the end edge portion 44 of the vehicle body panel 40 and being sandwiched between the edge portion 44 and the edge portion 44. In order to facilitate understanding, in FIG. 4, the bellows-like cylindrical portion 14 of the grommet 10 is indicated by a virtual line.

  According to the grommet 10 having such a structure, since the contact reaction force generated by the contact of the contact pressing portion 18 with the vehicle body panel 40 is used, the bending deformation of the conventional bellows-like cylindrical portion is performed. Compared to the case where the ease of use is utilized, even if the electric wire is bent, the end portion 44 of the vehicle body panel 40 is securely used by utilizing the large contact reaction force of the bellows-like cylindrical portion 14. It can be displaced in a direction away from the center. In addition, as the door panel 42 is turned toward the closed position, the contact pressing portion 18 is brought into contact with the end edge portion 44 of the vehicle body panel 40, and the contact bellows-like cylindrical portion 14 is moved to the vehicle body by utilizing the contact reaction force. Since it can be pressed in a direction away from the edge 44 of the panel 40, the bellows-like tube can be reliably obtained only by closing the door panel 42 without requiring any special operation or force. Therefore, it is possible to prevent the vehicle body panel 40 of the portion 14 and the edge portions 44 and 46 of the door panel 42 from being caught.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by these specific description. For example, the contact pressing portion 18 protrudes to the outer peripheral side of the bellows-like cylindrical portion 14 and comes into contact with the end edge portion 44 of the vehicle body panel 40 before the bellows-like cylindrical portion 14. As long as it presses the bellows-like tube portion 14 in a direction away from the end edge 44 of 40, an annular shape projecting in an annular shape with a constant thickness on the outer peripheral surface of the bellows-like tube portion 14 may be used. . Thereby, although the contact press part 18 becomes large as a whole, the directionality of the contact press part 18 at the time of assembling the grommet 10 to the vehicle body panel 40 and the door panel 42 can be eliminated. In the present embodiment, the contact pressing portion 18 is integrally formed with the bellows-shaped cylindrical portion 14, but the bellows-shaped cylindrical portion 14 and the contact pressing portion 18 may be provided separately, or the bellows-shaped cylindrical portion. One or a plurality of exterior mounts may be mounted at any 14 positions. In addition, a plurality of contact pressing portions 18 are provided so that the pinching of the bellows-like tube portion 14 between the end edge portion 46 of the door panel 42 and the end edge portion 44 of the vehicle body panel 40 can be prevented more reliably. Good.

  In addition, in the above embodiment, an example in which the grommet 10 of the present invention is externally mounted on the wire harness 12 that spans between the vehicle body panel 40 and the door panel 42 of the back door is shown. As long as it is hinged so that it can be freely opened and closed, any may be used. Therefore, the grommet 10 of the present invention can obtain the same effect even if it is mounted on the wire harness between the side door and the vehicle body panel.

10: Grommet, 12: Wire harness, 14: Bellows-shaped tube portion, 16a, b: Fitting tube portion, 18: Contact pressing portion, 22: Fan-shaped protrusion, 24: Annular portion, 26: Arc-shaped end surface, 40: body panel, 41, 43: through hole, 42: door panel (movable panel), 44: end edge, 46: end edge

Claims (3)

A grommet sheathed on a wire harness that spans between a vehicle body panel and a movable panel that is hinged to be openable and closable with respect to the vehicle body panel,
A bellows-like tube portion through which the wire harness is inserted and disposed;
A pair of fitting tube portions connected to both end portions of the bellows-like tube portion and fitted and fitted in through holes provided in the vehicle body panel and the movable panel, respectively;
The protruding in a bellows tube portion outer peripheral surface on which are provided, when the movable panel is rotated toward the closed position relative to the vehicle body panel, before Symbol abuts against the vehicle body panel, the corresponding pressing in a direction away from between the end edge of the edge portion of the vehicle body panel edge portion of the movable panel the bellows-shaped tubular portion by the contact reaction force caused by contact approaches and the movable panel A grommet including a contact pressing portion.   The contact pressing portion has a fan-shaped protrusion that extends in a fan shape from a partial region in the circumferential direction on the outer peripheral surface of the bellows-shaped cylindrical portion, and the movable panel is opposed to the vehicle body panel. 2. The grommet according to claim 1, wherein an arcuate end surface of the fan-shaped protrusion of the contact pressing portion faces the end edge of the vehicle body panel while being held at the open position end. .   In another region in the circumferential direction on the outer peripheral surface of the bellows-shaped cylindrical portion where the fan-shaped protrusion is not provided, an annular portion protruding in an annular shape along the outer peripheral surface of the bellows-shaped cylindrical portion is provided. The grommet according to claim 2 provided.

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