JP2018042317A - Wiring harness grommet and protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring harness grommet in which the connection between a grommet and a protector for protecting a wiring harness so as to prevent slip-off and detent while having high holding force.SOLUTION: In a grommet 13 having a protection cylinder part 31 to which a wiring harness is inserted, a cylinder-shaped base cylinder part 32 having an outer peripheral surface having a diameter smaller than that of the protection cylinder part 31, a held part 33 to which a holding part 51 of an end part of a protector 15 is externally fitted are comprised from a base side along an axial direction to the end part of the protection cylinder part 31 in this order. In the held part 33, a plurality of convex parts 34 projected to an outer peripheral side from a reference as a reference of the outer peripheral surface of the base cylinder part 32 is comprised with an interval along a peripheral direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a grommet and a protector used when wiring a wire harness in a vehicle, for example, and more particularly to a connection structure between the grommet and the protector.

  The grommet has a bellows-shaped protective cylinder portion that covers the wire harness, and a protector fixed to the vehicle frame is connected to an end portion of the protective cylinder portion. The grommet is made of elastic rubber, while the protector is made of hard synthetic resin.

  Such a connection between the grommet and the protector has been performed at the connecting tube portion of the grommet and the connecting portion of the protector as disclosed in Patent Document 1 below. Specifically, the connecting tube portion of the grommet is attached to the surface of the projecting piece-like connecting portion of the protector, and an adhesive tape is wound around and connected to the connecting portion and the connecting tube portion. The stopper and the rotation stopper in this connection structure depend on the holding force of a separate adhesive tape.

  Although it is not a grommet but a corrugated tube and a protector are connected, there is a connection structure disclosed in the following Patent Document 2 that can prevent the connection without using a separate member. This connection structure is fitted to the corrugated tube troughs, which have annular crests and troughs in the axial direction alternately on the inner surface of the bowl-shaped protector body constituting the protector and the lid attached to the main body. An arc-shaped locking rib that stops is provided. In this configuration, the locking rib prevents the corrugated tube from coming off but does not prevent it from rotating.

JP 2012-191722 A JP2012-5217A

  The main object of the present invention is to make it possible to prevent the connecting portion between the grommet and the protector from coming off and preventing the rotation with a high holding force.

  The means for that is a grommet having a protective cylinder part through which the wire harness is inserted, and a cylindrical original cylinder part having an outer peripheral surface having a smaller diameter than the protective cylinder part at the end of the protective cylinder part; And a held portion to which the holding portion at the end portion of the protector is externally fitted is provided in order from the base side along the axial direction, and the held portion is more than the reference with respect to the outer peripheral surface of the original tube portion. It is a grommet provided with a plurality of convex portions protruding to the outer peripheral side.

  In this configuration, the plurality of convex portions of the held portion that protrudes to the outer peripheral side from the original cylindrical portion are fitted in a state where they enter the fitting concave portion of the holding portion of the protector, and are prevented from coming off and rotating. At this time, the convex portion comes into surface contact with the inner surface of the fitting concave portion to generate a frictional resistance, thereby increasing the holding force.

  As an aspect of the invention of the grommet, it is preferable that the convex portion is disposed at a symmetrical position with a virtual vertical line passing vertically through the center of the cross-sectional shape of the original tube portion. The “up and down” is an arbitrary direction orthogonal to the grommet axial direction. When the grommet is configured to be fitted and connected to the protector in a direction orthogonal to the axial direction, the fitting direction is “ The “up and down” direction may be used, and “down” means the front end side in the fitting direction.

  In this configuration, the convex portions arranged at equal positions on the left and right sides are fitted into the fitting concave portions of the protector with a good balance.

  As an aspect of the invention of this grommet, it is preferable that the convex portion is disposed at a position symmetrical in the vertical direction with a virtual horizontal line passing through the center of the cross-sectional shape of the original tube portion to the left and right. The “left and right” is a direction orthogonal to the grommet axis direction among the directions orthogonal to the “up and down” direction. The “grommet axial direction” is a direction that penetrates the core at the mentioned portion when the grommet is straight in the longitudinal direction and is in the same direction as the longitudinal direction, or in a shape bent in the longitudinal direction. .

  In this configuration, the convex portions arranged at equal positions in the vertical direction are fitted into the fitting concave portions of the protector with a good balance.

  As an aspect of the invention of this grommet, a grommet in which a built-up portion is formed on the outer peripheral side of the base portion of the convex portion on the outer peripheral side with respect to the reference position on the outer peripheral surface position of the original cylindrical portion may be used.

  Even if it is a case where the original cylindrical part has a circular cross section and is provided with a convex part, even if it is predicted that shape holding force cannot be obtained at the part centered on the base part of the convex part, the overlay part Imparts a shape holding force, facilitates fitting of the protector to the fitting recess, and exhibits the holding force of the holding portion. In particular, when a built-up portion is formed between the convex portions to form a flat surface, the integrity of the convex portions connected by the flat portion can be enhanced.

  In addition, when forming a built-up portion to form a flat portion between convex portions, and forming this flat portion on opposite surfaces of the held portion, the planes of these opposite surfaces, for example, up and down and left and right If they are parallel to each other, the shape retention force can be increased and the fitting to the protector can be facilitated.

  As an aspect of the invention of the grommet, the held portion may be a grommet having a plane on a side surface that is perpendicular to the protector axial direction and parallel to the insertion direction with respect to the protector. The “protector axial direction” is referred to when the protector is straight in the longitudinal direction and is bent in the same direction as the longitudinal direction, as in the grommet axial direction described above. It is the direction which penetrates the core in the site.

  In this structure, the side surface which consists of a parallel plane of a to-be-held part facilitates insertion with respect to the holding part of a protector.

  As an aspect of the invention of the grommet, a grommet in which an extended portion having a resistance surface in surface contact with the inner surface of the protector may be formed at an end portion of the held portion opposite to the original cylindrical portion. The “inner surface of the protector” may be, for example, a flat surface or an upper surface of a thin plate-like rib as long as it is a surface existing inside the protector that is appropriately formed.

  In this configuration, the resistance surface of the extending portion comes into surface contact with the inner surface of the protector to generate frictional resistance, which contributes to prevention of detachment.

  In the case of forming the extended portion, it is preferable to provide a cylindrical tip tube portion as the extended portion.

  In this configuration, the front tube portion serves to prevent friction by generating frictional resistance and preventing the movement of the inserted wire harness from directly hitting the mounted portion and wobbling. Furthermore, when a part of the outer peripheral surface of the front tube part is flush with a part of the surface between the convex parts, it is easy to make surface contact with the protector.

  Moreover, you may provide the cylindrical tip cylinder part and the tongue-like extension piece extended from the end of this tip cylinder part as said extension part.

  In this configuration, the front tube portion serves to prevent friction by generating frictional resistance as described above and preventing the movement of the inserted wire harness from directly striking the attached portion and wobbling. Since the extended piece has a tongue-like shape, the frictional resistance is generated in a flexible manner corresponding to the inner shape of the grommet. When the wire harness through which the extended piece is inserted is formed at a position on the upper side, the frictional resistance is more reliably generated. When the part of the outer peripheral surface of the front tube part is flush with a part of the surface between the convex parts, it is easy to make surface contact with the protector. Similarly, when the part of the outer peripheral surface of the extending part is flush with a part of the surface between the convex parts, it is easy to make surface contact with the protector. A part of the outer peripheral surface of the extending part is preferably flush with a part of the outer peripheral surface of the tip tube part.

  As an aspect of the grommet invention, a grommet in which a protrusion is formed on a surface parallel to the protector axial direction or the grommet axial direction of the held portion may be used.

  In this configuration, at least a part of the parallel surface protrudes in a direction perpendicular to the parallel surface, so that the protrusion can also be prevented from coming off and rotating. In the case where the protrusion is formed on only one side surface of the plurality of surfaces parallel to the axial direction, it functions to prevent an erroneous fitting direction. The protrusions may be formed in the upper part as much as possible, such as a part of the side surface that is higher than a half in the vertical direction. In this case, it is possible to secure the strength of the protector by making the cutout portion of the corresponding part of the protector as small as possible.

  Another means for solving the problem is a protector having a holding portion for holding a grommet provided with a protective cylinder portion through which the wire harness is inserted, at the end portion. The covered portion of the grommet comprising a cylindrical original tube portion having an outer peripheral surface having a smaller diameter than the protective tube portion at an end portion and a held portion to which the holding portion is externally fitted in order from the base side along the axial direction. It is a protector provided with the some fitting recessed part with which the some convex part which is formed in a holding | maintenance part and protrudes in the outer peripheral side rather than this reference | standard is set on the basis of the outer peripheral surface of the said original cylinder part.

  In this configuration, the plurality of fitting concave portions provided in the holding portion are fitted in a state where the convex portion of the held portion of the grommet is housed inside, thereby preventing the grommet from coming off and preventing rotation. At this time, the inner surface of the fitting concave portion comes into surface contact with the convex portion to generate a frictional resistance, thereby increasing the holding force.

  As an aspect of the invention of the protector, at least the holding part may be a protector having a main body part that holds the wire harness in an inserted state and a lid part that adheres to the main body part.

  In this configuration, the main body portion is a portion into which the grommet through which the wire harness is inserted is fitted, and if the lid portion is attached, the connection state between the protector and the grommet can be obtained.

  As an aspect of the invention of the protector, a protector in which a retaining piece that is in contact with the surface of the convex portion of the grommet fitted in the fitting concave portion and in contact with the surface of the original cylindrical portion is formed on the end side from the fitting concave portion. It is good.

  In this configuration, the fitting concave portion fits into the convex portion to prevent and prevent rotation, and the retaining piece contacts the surface of the convex portion on the side of the original cylinder portion to prevent the convex portion from coming off. A restricting piece may be provided at a position on the inner side in the axial direction than the retaining piece and sandwiching the fitting recess together with the retaining piece to prevent over-insertion of the grommet. When there is a recess having a flat bottom between the convex portions of the grommet, if a flat portion corresponding to the flat surface of the grommet is provided, a step is formed in the vicinity of the flat portion, and the retaining and rotation prevention can be performed.

  As an aspect of the invention of the protector, the protector has an engaging structure that engages with the main body and the lid, and the width of the engaging structure is longer than the length of the fitting recess in the protector axial direction. In addition, the protector may be formed at a position where the engagement structure is overlapped with the portion having the fitting recess in the protector axial direction.

  In this configuration, the main body portion and the lid portion are engaged in a state in which the engagement structure substantially wraps the fitting portion between the fitting concave portion and the convex portion, and this engagement force is applied to the fitting concave portion and the convex portion. Use effectively for retention.

  In the case of having the engagement structure, the engagement structure is constituted by a plate-like engagement piece and an engagement groove into which the engagement piece is inserted, and an upper edge of a member facing the inside of the engagement piece. It is good also as a protector in which the insertion part which a part fits was formed. “Inside the engagement piece” means to include a part of the engagement piece as well as a case of a part different from the engagement piece.

  In this configuration, when the lid portion is attached to the main body portion, the upper edge portion of the member facing the fitting portion is fitted, and the lower member and the lid portion are prevented from being displaced to obtain an appropriate holding state of the grommet. .

  As an aspect of the invention of the protector, a protrusion that is formed on a surface parallel to the protector axial direction of the grommet or the grommet axial direction at the upper edge of the main body part and projects partially outward. It is good also as a protector which the notch part which a part fits in is formed, and the magnitude | size of this notch part is a magnitude | size corresponding to a fitting with the said projection part.

  In this configuration, the notch portion actively engages with the protrusion of the grommet to prevent it from coming off and rotating, but the notch has a size corresponding to the protrusion on the upper edge of the main body. Therefore, the size of the notch is made as small as possible to suppress the strength reduction of the protector.

  According to the present invention, the connecting portion between the grommet and the protector can be prevented from coming off and prevented from rotating with a high holding force.

The perspective view of a wire harness wiring body. The disassembled perspective view of a grommet and a protector. The side view of the principal part of a grommet. The front view of the principal part of a grommet. The longitudinal cross-sectional view of the principal part of a grommet. The side view of the isolation | separation state of the principal part of a grommet and a protector. AA sectional drawing of FIG. The bottom view of a cover part. The top view of a main-body part. The side view of the connection part of a grommet and a protector. BB sectional drawing of FIG. The longitudinal cross-sectional view of the connection part of a grommet and a protector. The front view of the grommet which concerns on another example.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
The wire harness wiring body 11 is shown in FIG. The wire harness routing body 11 is obtained by holding the wire harness 12 in a state where the wire harness 12 is inserted into the grommet 13 and the protector 15, and is used for wiring the wire harness 12 by being mounted on the hinge portion of the back door of the vehicle, for example. . The grommet 13 of the wire harness wiring body 11 has a structure in which the end portion is connected in a state of being inserted into the protector 15.

  The grommet 13 is made of rubber having elasticity, and the protector 15 is made of hard synthetic resin, which have different properties, but the ends are prevented from coming off and prevented from rotating with a high holding force. Connected in state.

  First, the configuration of the grommet 13 will be described, and then the configuration of the protector 15 will be described.

  FIG. 2 is a perspective view of the grommet 13 and the protector 15 in a separated state. As shown in this figure, the grommet 13 has a substantially cylindrical shape with a thickness that allows the wire harness 12 to be inserted therethrough.

  The grommet 13 has a protective cylinder portion 31 through which the wire harness 12 is inserted. The protective cylinder portion 31 is formed in a bellows shape, and a fixed portion 31a fixed to a hole portion (not shown) formed in the vehicle body is formed at one end portion in the axial direction. The fixing portion 31a has a flange portion and the like. A connection portion 31b connected to the protector 15 is formed at the other end.

  The connection part 31b is equipped with the cylindrical original cylinder part 32 which has an outer peripheral surface smaller diameter than the protection cylinder part 31, and the to-be-held part 33 hold | maintained at the protector 15 in order from the base side along an axial direction. . The “base side” means an intermediate portion side in the axial direction from the end in the axial direction. In other words, the connection part 31b is equipped with the former cylinder part 32 and the to-be-held part 33 in order toward the axial direction end along an axial direction.

  Specifically, the former cylinder part 32 is formed in a bellows shape and has a cylindrical shape having an outer peripheral surface having a diameter smaller than the diameter of the large diameter part in the protective cylinder part 31 having the large diameter part and the small diameter part alternately. is there. The original cylindrical portion 32 has a circular cross section in accordance with the cross sectional shape of the protective cylindrical portion 31, but may be a rectangular tube shape. As shown in FIG. 3, the axial length of the original cylindrical portion 32 is set to an appropriate length that does not become too long to sink the significance of the existence of the bellows-shaped portion.

  The held portion 33 is formed with a thickness (length in the axial direction) that has sufficient strength when held in the axial direction and has a plurality of convex portions 34. These convex portions 34 are arranged at intervals in the circumferential direction of the held portion 33. The convex portion 34 is a portion that protrudes to the outer peripheral side with respect to the position of the outer peripheral surface of the original cylindrical portion 32, and is formed in an appropriate size and an appropriate shape. The “outer peripheral side” from which the protrusion 34 protrudes is the outer peripheral side with respect to the central part of the cross-sectional shape of the held portion 33.

  The convex portions 34 in the illustrated example are symmetric with respect to a virtual vertical line that passes vertically through the center of the cross-sectional shape of the original cylindrical portion 32, and are formed at four positions that are vertically symmetric with respect to a virtual horizontal line that passes through the center. . Here, “up and down” is a direction coinciding with the fitting direction with respect to the protector 15, and “left and right” is a direction orthogonal to the axial direction of the grommet 13 among the directions orthogonal to the above “up and down” direction. It is.

  Specifically, as shown in FIG. 4, the convex portion 34 has a substantially rectangular parallelepiped block shape extending upward or downward at both lateral positions on the upper and lower surfaces. As shown in FIG. 5, a built-up portion 35 is formed on the outer peripheral side of the base with respect to the position of the outer peripheral surface of the base tube portion 32 at the base of the four convex portions 34. That is, the upper surface 36, the lower surface 37, and the left and right side surfaces 38 are configured by a plane different from the outer peripheral surface shape of the reference original cylinder portion 32. The imaginary line in FIG. 5 is a line indicating the shape of the side surface inside the convex portion 34 when the built-up portion 35 of the upper surface 36 and the lower surface 37 is not provided. The upper surface 36 and the lower surface 37 are parallel to each other.

  The left and right side surfaces 38 are parallel to each other, and these side surfaces 38 are parallel to the insertion direction with respect to the protector 15. The upper surface 36 and the lower surface 37 are formed at positions that are tangent to the outer peripheral surface of the original cylindrical portion 32. That is, the upper surface 36 and the lower surface 37 have a portion that is flush with a part of the outer peripheral surface of the original cylindrical portion 32. On the other hand, the left and right side surfaces 38 are formed at positions projecting slightly to the outer peripheral side from the outer peripheral surface of the original cylindrical portion 32. The protrusion amount t of the side surface 38 is set to an appropriate thickness that gives the held portion 33 appropriate rigidity.

  The height of the convex portion 34 on the upper surface 36 side of the convex portion 34 corresponds to the thickness of the corresponding portion of the protector 15, but the height of the convex portion 34 on the lower surface 37 side is greater than the thickness of the corresponding portion of the protector 15. Is slightly higher.

  All the convex portions 34 are provided with a contact surface portion 34 a that makes surface contact with the protector 15. In the case of the convex portion 34 in the illustrated example, at least a part of the side surfaces on both sides in the axial direction and the side surfaces on both sides in the left-right direction are the contact surface portions 34a.

  A protruding portion 39 is formed on a side surface 38 connecting the convex portions 34 arranged in the vertical direction, that is, one side surface 38 of the surfaces of the held portion 33 parallel to the axial direction. As shown in FIG. 6, the protrusion 39 is formed in a substantially rectangular parallelepiped shape on a part of the side surface 38, and protrudes in the vertical direction of the side surface 38. The formation position of the protrusion 39 is above the center position of the grommet 13 (see the alternate long and short dash line in FIG. 6) and is in the middle of the held portion 33 in the thickness direction. The height of the protrusion 39 corresponds to the thickness of the corresponding portion of the protector 15.

  An extended portion 41 that is in surface contact with the inner surface of the protector 15 is formed at the end of the held portion 33 on the side opposite to the original cylindrical portion 32. The extending portion 41 has a resistance surface 41 a that is in contact with the inner surface of the protector 15 and generates a frictional resistance. In the illustrated example, the extending portion 41 has a cylindrical tip tube portion 42 and a tongue-shaped extending piece 43 in order from the held portion 33 side in the axial direction.

  The front tube portion 42 has an outer peripheral surface having the same diameter as that of the above-described main tube portion 32, and the length in the axial direction is a short cylindrical shape such that a plate-like rib contacts. At least a part of the outer peripheral surface is the aforementioned resistance surface 41a. Since the outer peripheral surface of the front tube portion 42 has the same diameter as the outer peripheral surface of the main tube portion 32, the intermediate portion in the left-right direction of the upper surface 36 and the lower surface 37 between the convex portions 34 arranged on the left and right of the held portion 33 It becomes flush with the outer peripheral surfaces of the portion 32 and the front tube portion 42.

  The extending piece 43 is formed at the lower portion of the front tube portion 42 and has a circular arc cross section, and has the same thickness as the front tube portion 42. At least a part of the lower surface of the extended piece 43 is the aforementioned resistance surface 41a. Since the extended piece 43 is formed in the lower part of the front tube part 42, the wire harness 12 to be inserted goes up. In other words, the extended piece 43 is sandwiched between the wire harness 12 and the inner surface of the protector. The width and length of the extended piece 43 are set to dimensions necessary for generating the necessary frictional resistance according to the shape of the protector 15.

  Since the thickness of the extended piece 43 is the same as that of the front tube portion 42, the middle portion of the lower surface of the extended piece 43 in the horizontal direction is the upper surface 36 and the lower surface 37 between the convex portions 15 arranged on the left and right of the held portion 33. Together with the intermediate portion in the left-right direction, the outer peripheral surfaces of the original cylinder part 32 and the front cylinder part 42 are flush with each other. On both the left and right sides of the tip of the extended piece 43, protrusions 43a extending in the extending direction of the circle forming the extended piece 43 are formed. These protrusions 43 a come into contact with the inner surface of the protector 15 and suppress an inadvertent displacement of the extending piece 43.

Next, the configuration of the protector 15 will be described.
As shown in FIG. 2, the protector 15 has a holding portion 51 that holds the held portion 33 of the grommet 13 at one end portion. The protector 15 has at least the above-described holding portion 51 having a main body portion 52 and a lid portion 53 that adheres to the main body portion 52, and is formed of a hard synthetic resin as a whole. The protector 15 in the illustrated example has a configuration in which the entirety is divided into a main body 52 and a lid 53. That is, when the protector 15 inserts the held portion 33 of the grommet 13 from the top to the bottom in the vertical direction orthogonal to the axial direction with respect to the holding portion 51 of the main body 52, the protector 15 connects the grommet 13. It is the structure which can do.

  The main body 52 has a concave housing groove 52a formed inside, and the wire harness 12 is housed in the housing groove 52a. As shown in FIG. 6, the main body 52 is formed to have a height higher than the center position of the grommet 13 (see the dashed line in FIG. 6). For example, the height may be about 80% of the height of the held portion 33 of the grommet 13. The lid portion 53 has hanging pieces 55 on the left and right sides that cover the outer surfaces of the left and right side walls 54 of the main body portion 52. Similarly to the main body 52, the lid 53 also has a concave receiving groove 53a inside.

  The holding part 51 of the main body part 52 and the lid part 53 is formed in a size that can accommodate the part from the held part 33 side of the original cylinder part 32 of the grommet 13 to the front cylinder part 42. A plurality of fitting recesses 56 into which the protrusions 34 of the grommet 13 are fitted are provided in the intermediate portion of the holding portion 51 in the axial direction. The fitting recess 56 in the illustrated example is formed by a through hole and has a substantially square shape in plan view (see FIGS. 7, 8, and 9). 8 is a bottom view of the main part of the lid, and FIG. 9 is a plan view of the main part of the main body.

  Since the fitting recess 56 is formed of a through hole, four surfaces forming a square hole shape in plan view are the recess forming surfaces 56 a, and at least a part of these recess forming surfaces 56 a is the protruding portion 34 of the grommet 13. This is a portion in surface contact with the aforementioned contact surface portion 34a. In order to generate a high frictional resistance, the clearance between the fitting concave portion 56 and the convex portion 34 is preferably zero.

  As shown in FIG. 7, which is a cross-sectional view taken along the line AA in FIG. 6, the portion between the fitting recesses 56 has a flat portion 57, and the flat portion 57 of the main body portion 52 is the lower surface of the grommet 13. 37 is in surface contact. The flat surface portion 57 of the lid portion 53 is in surface contact with the upper surface 36 of the grommet 13.

  The distance W1 between the inner side surfaces of the left and right side walls 54 of the main body 52 is the same as the width W2 of the held portion 33 of the grommet 13, that is, the distance W2 between the left and right side surfaces 38, and is set to a dimension that can be accommodated without rattling. .

  Since one side surface of the grommet 13 has the protrusion 39, a notch 58 in which the protrusion 39 of the grommet 13 fits is formed at the upper edge of the corresponding side wall 54 of the main body 52. As shown in FIG. 6, the notch 58 is formed from the upper end edge of the side wall 54 in a size corresponding to the fitting to the protrusion 39. In other words, the projection 39 of the grommet 13 is formed at a position where such a notch 58 can be formed.

  The main body 52 and the lid 53 are fitted to the holding recess 51 formed on the end side of the fitting recess 56, that is, the end of the protector 15. A retaining piece 59 that is in contact with the surface of the projection 34 in the grommet 13 fitted to the recess 56 on the side of the original cylinder 32 is formed in a rib shape. The retaining piece 59 has a plate shape having a semi-arc-shaped upper surface 59a that makes the portion corresponding to the middle of the flat surface portion 57 the lowest, between the left and right side walls 54 in the main body portion 52 and between the hanging pieces 55 in the lid portion 53. Is erected. The inner surface of the retaining piece 59, that is, the surface in contact with the surface of the projection 34 in the grommet 13 on the side of the original cylindrical portion 32 is flush with the recess forming surface 56 a of the fitting recess 56. The upper surface 59 a of the retaining piece 59 is a portion that is in surface contact with the outer peripheral surface of the original cylindrical portion 32 of the grommet 13.

  As shown in FIGS. 8 and 9, a restricting piece 61 is formed in a rib shape at a position facing the retaining piece 59 with the fitting recess 56 interposed therebetween, as in the retaining piece 59. The restricting piece 61 also has a plate shape having a semicircular arc-shaped upper surface 61 a that makes the portion corresponding to the middle of the flat portion 57 the lowest, and is erected flush with the recess forming surface 56 a of the fitting recess 56.

  The main body 52 and the lid 53 have an engagement structure 62 that engages with each other. The engagement structure 62 includes a plate-like engagement piece 63 and an engagement groove 64 into which the engagement piece 63 is inserted. The engagement piece 63 extends from the lower ends of the left and right hanging pieces 55 of the lid portion 53. The engaging piece 63 has a locking claw 63a at the tip. The engaging groove 64 is configured by forming a holding frame 65 in the outer surface of the left and right side walls 54 of the main body 52 so as to press and hold the inserted engaging piece 63 against the side wall 54.

  A fitting portion 66 into which the upper edge portion of the side wall 54 of the main body portion 52 as an opposing member is fitted is provided on the inner side of the engaging piece 63 of the lid portion 53, specifically, on the inner side of the locking piece 6. Yes. Since the retaining piece 59 described above exists at a position where the fitting portion 66 is formed, a notch 59b is formed at the end of the retaining piece 59 that is in contact with the hanging piece 55.

  Further, the width (axial length) L1 of the engaging structure 62 is the length of the fitting concave portion 56 in the axial direction of the protector 15, that is, the axial length L2 of the fitting concave portion 56 as shown in FIG. The engagement structure 62 is formed at a position where the portion having the fitting recess 56 overlaps the protector 15 in the axial direction.

  The grommet 13 and the protector 15 configured as described above are used as follows.

  First, the wire harness 12 is inserted and held in the grommet 13, and the held portion 33 of the grommet 13 is inserted into the holding portion 51 in the main body portion 52 of the protector 15 from above.

  The held portion 33 of the grommet 13 has a built-up portion 35 even though both the original tube portion 32 and the front tube portion 42 are cylindrical, and in addition, the thickness of the left and right side surfaces 38 is set to the original tube. Since it is thicker than the portion 32 and the tip tube portion 42 and is a plane along the insertion direction, the shape is not easily collapsed, and the insertion operation can be easily performed even when the clearance is zero or close thereto. Although the held portion 33 has a plurality of convex portions 34, these are formed in symmetrical positions in the up, down, left and right directions, so that a good balance during insertion also contributes to the ease of insertion work.

  When inserting, since the projection 39 is formed only on one side surface 38 of the held portion 33 of the grommet 13, it is possible to prevent the grommet 13 from being inserted in the wrong direction.

  In the inserted state, the held portion 33 fits perfectly in the holding portion 15. This is because most of the held portion 33 is contained in the main body portion 52, and the opposed portions of the held portion 33 of the grommet 13 and the holding portion 51 of the protector 15 are in surface contact with most of the portions. It is. That is, the left and right side surfaces 38 of the held portion 33 and the upper surface 36 and the lower surface 37 between the convex portions 34 are in surface contact with the facing portions of the protector 15. Further, the contact surface portion 34 a of the convex portion 34 is brought into surface contact with the concave portion forming surface 56 a of the fitting concave portion 56. The direction of this surface contact is that the former side surface 38, the upper surface 36, and the lower surface 37 are inside and outside, whereas the latter convex portion 34 is a direction perpendicular to the axial direction and the axial direction. Become. Further, the convex portion 34 is sandwiched between the retaining piece 59 and the restricting piece 61 and comes into surface contact, and the upper surfaces 59a and 61a of the retaining piece 59 and the restricting piece 61 also face the outer peripheral surface of the front tube portion 42. Further, since the extended piece 43 is in surface contact with the inner surface of the holding groove 52a from the inner surface of the holding portion 51 to the inner surface of the housing groove 52a, a fitting state without backlash can be obtained.

  In the grommet 13 and the main body portion 52 in such an integrated state, the wire harness 12 is appropriately accommodated in the accommodation groove 52 a of the main body portion 52, and then the lid portion 53 is fitted into the main body portion 52. The lid 53 is attached by inserting the engagement piece 63 constituting the engagement structure 62 into the engagement groove 64. Since the fitting portion 66 is formed at the inner position of the engagement piece 63, the fitting can be performed correctly without being displaced.

  FIG. 10 is a side view of the state in which the lid 53 is attached and the grommet 13 is joined, and FIG. 11 is a cross-sectional view taken along the line BB of FIG. As shown in these drawings, the main body 52 and the lid 53 are integrated by an engagement structure 62, and as shown in FIG. 11 and FIG. 12, which is a cross-sectional view along the axial direction of the connecting portion, the grommet. Most portions of the 13 held portions 33 except the top surface of the convex portion 34 are in surface contact with the inner surface of the protector 15 as described above. For this reason, frictional resistance is generated in each part, and the retaining and turning prevention are performed with a high holding force.

  In addition, since the convex portion 34 and the fitting concave portion 56 which are main components of the retaining structure and the rotational stopper are present in the portion where the engaging force of the engaging structure 62 exerts, the connection portion between the grommet 13 and the protector 15 is further increased. Holding power can be increased.

  The grommet 13 has a protrusion 39, and this protrusion 39 fits into the notch 58 of the main body 52. This also contributes to preventing rotation and retaining, but the notch 58 of the main body 52. Since the upper edge of the side wall 54 having a higher height is formed to the minimum necessary size, a decrease in the strength of the protector 15 can be suppressed as compared with the case where the notch 58 is deeply formed. . For this reason, the holding force of the connecting portion can be sufficiently secured, which contributes to the realization of a high holding force.

  Further, as shown in FIG. 12, since the former cylindrical portion 32, the lower surface 37, the front cylindrical portion 42, and the lower surface of the extending piece 43 of the grommet 13 have flush portions, the extending piece 43 is The surface of the main body 52 can be sufficiently brought into surface contact. In addition, since the wire harness 12 is placed on the extended piece 43, a load is applied and a higher frictional resistance can be generated.

  As described above, when the above-described grommet 13 and protector 15 are used, the connection between the two can be easily performed without requiring a separate member. In addition, since the connecting portion comes into surface contact at many portions having different directions to increase the frictional resistance, the connecting portion can be prevented from coming off and rotating with a high holding force.

  The above-described configuration is an example for carrying out the present invention, and the present invention can adopt other configurations.

  For example, as shown in FIG. 13, the number of convex portions 34 may be two at the bottom and one at the top.

  The fitting recess may be a closed hole with a bottom instead of a through hole. In this case, the recess forming surface is an inner peripheral surface that forms the outline of the hole and an inner bottom surface that forms the bottom, and a through hole may be formed on the inner bottom surface so that the convex portion can be easily fitted. . In this case, unlike the above, not only the side surface of the convex portion but also the tip surface is at least a part of the contact surface portion.

DESCRIPTION OF SYMBOLS 11 ... Wire harness wiring body 12 ... Wire harness 13 ... Grommet 15 ... Protector 31 ... Protection cylinder part 32 ... Original cylinder part 33 ... Held part 34 ... Convex part 34a ... Contact part 35 ... Overlay part 38 ... Side face 39 ... Projection part 41 ... Extension part 41 a ... Resistance surface 42 ... Tip tube part 43 ... Extension piece 51 ... Holding part 52 ... Body part 53 ... Lid part 56 ... Fitting recess 56a ... Recess formation surface 58 ... Notch 59 ... Retaining piece 62 ... engaging structure 63 ... engaging piece 64 ... engaging groove 66 ... fitting portion

Claims (16)

A grommet having a protective cylinder portion through which the wire harness is inserted,
A cylindrical original tube portion having an outer peripheral surface having a smaller diameter than the protection tube portion and a held portion to which the holding portion of the end portion of the protector is externally fitted along the axial direction at the end portion of the protection tube portion. In order from the base side,
A grommet in which the held portion includes a plurality of convex portions projecting toward the outer peripheral side with respect to the outer peripheral surface of the original cylindrical portion with respect to the reference. The grommet according to claim 1, wherein the convex portion is disposed at a symmetrical position with a virtual vertical line passing vertically through the center of the cross-sectional shape of the original cylindrical portion. The grommet according to claim 1 or 2, wherein the convex portion is disposed at a position that is vertically symmetric with respect to a virtual horizontal line passing through the center of the cross-sectional shape of the original tube portion to the left and right. The grommet according to any one of claims 1 to 3, wherein a built-up portion is formed on the outer peripheral side of the base portion of the convex portion on the outer peripheral side with respect to the position of the outer peripheral surface of the original tube portion. The grommet according to any one of claims 1 to 4, wherein the held portion has a flat surface on a side surface that is orthogonal to a protector axial direction and is parallel to an insertion direction with respect to the protector. The extension part which has the resistance surface which surface-contacts with the inner surface of the said protector was formed in the edge part on the opposite side to the said original cylinder part in the said to-be-held part. Grommet described in. The grommet according to claim 6 provided with a cylindrical tip tube part as said extension part. The grommet according to claim 6, comprising a cylindrical tip tube portion as the extension portion and a tongue-like extension piece extending from an end of the tip tube portion. The grommet according to any one of claims 1 to 8, wherein a protrusion is formed on a surface parallel to the protector axial direction or the grommet axial direction of the held portion. A protector having a holding portion for holding a grommet provided with a protective cylinder portion through which the wire harness is inserted at the end,
A base portion along the axial direction includes a cylindrical original tube portion having an outer peripheral surface having a smaller diameter than the protection tube portion at an end portion of the protection tube portion, and a held portion to which the holding portion is externally fitted. A plurality of fitting recesses that are formed in the held portion of the grommet provided in order from the side and that are fitted with a plurality of protrusions that protrude to the outer peripheral side with respect to the outer peripheral surface of the original cylinder part are provided. Protector. The protector according to claim 10, wherein at least the holding portion includes a main body portion that holds the wire harness in an inserted state, and a lid portion that adheres to the main body portion. The protector according to claim 11, wherein a retaining piece that is in contact with a surface of the convex portion of the grommet fitted into the fitting concave portion and in contact with the surface of the original cylindrical portion is formed on an end side of the fitting concave portion. Having an engagement structure that engages with the main body and the lid;
The width of the engagement structure is formed longer than the length of the fitting recess in the protector axial direction,
The protector according to claim 11 or 12, wherein a position where the engagement structure is formed is a position overlapping with a portion having the fitting recess in the protector axial direction. The engagement structure includes a plate-like engagement piece and an engagement groove into which the engagement piece is inserted, and a fitting portion into which an upper edge portion of an opposing member is fitted is formed inside the engagement piece. The protector according to claim 13. Formed on the upper edge of the main body is a notch that is formed in a surface parallel to the protector axial direction or the grommet axial direction of the grommet and partially protrudes outwardly. And
The protector according to any one of claims 11 to 14, wherein a size of the notch is a size corresponding to the protrusion. The grommet held portion according to any one of claims 1 to 9 and the protector holding portion according to any one of claims 10 to 15 are connected to each other. Wire harness wiring body that holds the wire harness.

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