Grommets and grommet-equipped wire harnesses

Abstract

To provide a grommet capable of improving the reliability of the fixed state of an electric wire member and a grommet.SOLUTION: A grommet 12 has a cylindrical portion 31 into which a wire member 11 can be inserted, and the cylindrical portion 31 includes a tightening portion 32 that is provided in a part of the cylindrical portion 31 in the longitudinal direction and that tightens a binding band 13 from the outer periphery, and a projection portion 33 that is provided adjacent to the tightening portion 32 in the longitudinal direction of the cylindrical portion 31, protrudes radially outward of the cylindrical portion 31, and sets a protrusion amount so as to protrude radially outward beyond the binding band 13.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a grommet and a wire harness with a grommet. [Background technology]

[0002] Conventionally, there is a wire harness with a grommet that prevents water from getting on the electric wire (see, for example, Patent Document 1). The wire harness with a grommet includes, for example, an electric wire member having an electric wire and an exterior member such as a corrugated tube that covers the electric wire, and a grommet made of rubber or the like and having a cylindrical portion. The cylindrical portion has a fastening portion at a part of the length direction of the cylindrical portion to which a cable tie is fastened from the outer periphery. An end of the exterior member such as the corrugated tube is inserted into the cylindrical portion of the grommet, and the cable tie is fastened from the outer periphery of the fastening portion, thereby fixing the outer periphery of the fastening portion to the cylindrical portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication (WO) 2016 / 153045 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned grommet-equipped wire harness, the fastening portion is a groove having an outer diameter slightly smaller than that of the other portions of the tubular portion, so that, for example, the cable tie is easily displaced from the fastening portion in the length direction of the tubular portion. Also, since the fastening portion is a groove having an outer diameter slightly smaller than that of the other portions of the tubular portion, for example, it is difficult for an operator to visually check the fastening portion. Therefore, the workability when fastening the cable tie is poor, and even if the cable tie is displaced from the fastening portion in the length direction of the tubular portion, it is difficult for an operator to notice. For these reasons, there was a problem that the reliability of the fixed state of the electric wire member and the grommet was low.

[0005] An object of the present disclosure is to provide a grommet and a wire harness with a grommet that can improve the reliability of the fixed state between an electric wire member and the grommet. [Means for solving the problem]

[0006] The grommet of the present disclosure has a tubular portion into which an electric wire member can be inserted, and the tubular portion has a fastening portion provided at a part of the length of the tubular portion and to which a cable tie is fastened from the outer periphery, and a protruding portion provided adjacent to the fastening portion in the length of the tubular portion, protruding radially outward from the tubular portion, and having a protruding amount set so as to protrude radially outward beyond the cable tie.

[0007] The grommet-equipped wire harness of the present disclosure includes the grommet, the electric wire member, and the cable tie. Effect of the Invention

[0008] According to the grommet and the grommet-equipped wire harness of the present disclosure, the reliability of the fixed state between the electric wire member and the grommet can be improved. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a partial side view of a grommet-equipped wire harness according to an embodiment. [Diagram 2] FIG. 2 is a partial cross-sectional view of the grommet-equipped wire harness according to the embodiment. [Diagram 3] FIG. 3 is a partial cross-sectional view of a wire harness with a grommet according to another embodiment. [Figure 4] FIG. 4 is a partial cross-sectional view of a wire harness with a grommet according to another embodiment. [Diagram 5] FIG. 5 is a partial cross-sectional view of a wire harness with a grommet according to another embodiment. [Figure 6] FIG. 6 is a partial side view of a wire harness with a grommet according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described. The grommet of the present disclosure comprises: [1] A cylindrical portion into which an electric wire member can be inserted, the cylindrical portion having a tightening portion provided at a part of the length of the cylindrical portion and to which a cable tie is tightened from the outer periphery, and a protruding portion provided adjacent to the tightening portion in the length of the cylindrical portion, protruding radially outward from the cylindrical portion, and having a protruding amount set so as to protrude radially outward further than the cable tie.

[0011] According to this configuration, the protrusion of the cylindrical portion improves the reliability of the fixed state between the electric wire member and the grommet. In detail, the protrusion is provided adjacent to the fastening portion in the length direction of the cylindrical portion, protrudes radially outward from the cylindrical portion, and the protrusion amount is set so as to protrude radially outward beyond the cable tie, so that, for example, the cable tie is less likely to shift from the fastening portion in the length direction of the cylindrical portion. In addition, for example, the worker can easily visually check the fastening portion together with the protrusion. Therefore, the workability when fastening the cable tie is improved, and the worker can easily notice that the cable tie is shifted from the fastening portion in the length direction of the cylindrical portion. As a result, the cable tie can be stably and normally assembled, the assembled state of the cable tie is stable, and the reliability of the fixed state between the electric wire member and the grommet can be increased.

[0012] [2] It is preferable that the protrusions are provided on both sides of the fastening portion in the longitudinal direction of the tubular portion. According to this configuration, the protrusions are provided on both sides of the fastening portion in the longitudinal direction of the tubular portion, so that, for example, the cable tie is less likely to slip from the fastening portion in either direction in the longitudinal direction of the tubular portion.

[0013] [3] It is preferable that the tightening portion has an outer diameter smaller than other portions of the tubular portion in the longitudinal direction. According to this configuration, since the tightening portion has a smaller outer diameter than other portions of the cylindrical portion in the longitudinal direction, for example, the tightening portion can be made thin and easily elastically deformed, and the tightening portion can be easily brought into close contact with the electric wire member when the cable tie is fastened. Also, for example, it is possible to reduce the maximum outer diameter of the cylindrical portion including the protruding portion.

[0014] [4] It is preferable that the protrusion be provided in an annular shape around the entire circumference of the tubular portion. According to this configuration, since the protrusion is provided in a ring shape around the entire circumference of the tubular portion, the cable tie is less likely to slip from the fastening portion in the length direction of the tubular portion around the entire circumference of the fastening portion. Also, for example, a worker can easily visually check the fastening portion together with the protrusion around the entire circumference of the fastening portion.

[0015] [5] It is preferable that the protrusion is provided on a portion of the circumference of the cylindrical portion. According to this configuration, the protrusion is provided on a portion of the circumference of the cylindrical portion, so that it is possible to avoid interference between the protrusion and other components, such as a locking portion provided on the cable tie.

[0016] [6] It is preferable that the wall surface extending radially of the tubular portion to connect the top surface of the protrusion and the fastening portion is inclined relative to the radial direction of the tubular portion in a direction that is visible when viewed from the radial outside of the tubular portion.

[0017] According to this configuration, the wall surface extending in the radial direction of the cylindrical part to connect the top surface of the protrusion and the tightening part is inclined with respect to the radial direction of the cylindrical part in a direction visible from the radial outside of the cylindrical part, so that, for example, workability when tightening a cable tie is improved. In detail, even if the positioning accuracy of the cable tie to the tightening part is low when tightening the cable tie to the tightening part, the cable tie is guided by the wall surface toward the tightening part as the cable tie is tightened. Therefore, workability when tightening the cable tie is improved.

[0018] The grommet-equipped wire harness of the present disclosure includes: [1] The device includes the grommet, the electric wire member, and the cable tie. According to this configuration, in the grommet-equipped wire harness, the reliability of the fixed state between the electric wire member and the grommet is improved.

[0019] [Details of the embodiment of the present disclosure] Specific examples of the grommet-equipped wire harness of the present disclosure will be described below with reference to the drawings. In each drawing, for convenience of explanation, some of the configuration may be exaggerated or simplified. Furthermore, the dimensional ratios of each part may differ from one drawing to another. Note that the present disclosure is not limited to these examples, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. In this specification, "parallel" and "orthogonal" do not only refer to the cases of strictly parallel and orthogonal, but also refer to roughly within the range in which the action and effect of this embodiment is achieved. Parallel In addition, the terms "circle" and "arc" in this specification do not necessarily mean a strict circle or arc, but also include approximate circles and arcs within the scope of the effects of this embodiment.

[0020] (Overall configuration of grommet-equipped wire harness 10) As shown in FIGS. 1 and 2, a grommet-equipped wire harness 10 includes an electric wire member 11, a grommet 12, and a cable tie 13.

[0021] (Configuration of electric wire member 11) The electric wire member 11 has an electric wire 21 and a corrugated tube 22 as an exterior member covering the electric wire 21. The corrugated tube 22 is formed in a cylindrical shape and has a bellows structure in which large diameter portions 23 and small diameter portions 24 are alternately provided in a row along the length direction.

[0022] (Grommet 12 configuration) The grommet 12 has a cylindrical portion 31 into which the electric wire member 11 can be inserted. The cylindrical portion 31 has a fastening portion 32 and a protruding portion 33.

[0023] The fastening portion 32 is provided at a portion of the length of the tubular portion 31. The fastening portion 32 has an outer diameter smaller than other portions of the length of the tubular portion 31. Thus, the fastening portion 32 constitutes a groove recessed in the outer peripheral surface of the tubular portion 31. The fastening portion 32 fastens the cable tie 13 from the outer periphery when the end of the corrugated tube 22 or the like is inserted into the tubular portion 31. The cable tie 13 has a flexible belt-like portion 41 and a locking portion 42 provided at an end of the belt-like portion 41 in the length direction. When the belt-like portion 41 is passed through, the locking portion 42 restricts the movement of the belt-like portion 41 in the removal direction, which is the opposite direction to the passing direction, to lock the belt-like portion 41.

[0024] The protruding portion 33 is provided adjacent to the fastening portion 32 in the length direction of the tubular portion 31. The protruding portion 33 is provided on both sides of the fastening portion 32 in the length direction of the tubular portion 31. The protruding portion 33 protrudes radially outward from the tubular portion 31. The protruding amount of the protruding portion 33 is set so that the protruding portion 33 protrudes radially outward beyond the cable tie 13 in a state fastened by the fastening portion 32. The protruding portion 33 is provided in an annular shape around the entire circumference of the tubular portion 31.

[0025] The operation of this embodiment will be described. In the grommet-equipped wire harness 10, the electric wires 21 are covered with the corrugated tube 22, and thus are protected from water. In addition, the end of the corrugated tube 22 is inserted into the cylindrical portion 31 of the grommet 12, and the cable tie 13 is fastened to the fastening portion 32 to keep the electric wires 21 covered with the grommet 12, and therefore the electric wires 21 exposed from the end of the corrugated tube 22 are protected from water.

[0026] Next, the effects of the above embodiment will be described below. (1) The protrusion 33 of the cylindrical portion 31 improves the reliability of the fixed state between the electric wire member 11 and the grommet 12. More specifically, the protrusion 33 is provided adjacent to the fastening portion 32 in the length direction of the cylindrical portion 31, protrudes radially outward from the cylindrical portion 31, and the protrusion amount is set so that it protrudes radially outward beyond the cable tie 13. Therefore, for example, the cable tie 13 is less likely to shift from the fastening portion 32 in the length direction of the cylindrical portion 31. In addition, for example, the worker can easily visually check the fastening portion 32 together with the protrusion 33. Therefore, the workability when fastening the cable tie 13 is improved, and the worker can easily notice that the cable tie 13 is shifted from the fastening portion 32 in the length direction of the cylindrical portion 31. For these reasons, the cable tie 13 can be stably and normally assembled, the assembled state of the cable tie 13 is stable, and the reliability of the fixed state between the electric wire member 11 and the grommet 12 can be increased.

[0027] (2) Since the protrusions 33 are provided on both sides of the fastening portion 32 in the longitudinal direction of the tubular portion 31, for example, the cable tie 13 is less likely to slip from the fastening portion 32 in either direction in the longitudinal direction of the tubular portion 31.

[0028] (3) Since the tightening portion 32 has a smaller outer diameter than other portions of the tubular portion 31 in the longitudinal direction, for example, the tightening portion 32 can be made thin and easily elastically deformed, so that the tightening portion 32 can be easily brought into close contact with the electric wire member 11 when the cable tie 13 is tightened. Also, for example, it is possible to reduce the maximum outer diameter of the tubular portion 31 including the protruding portion 33.

[0029] (4) Since the protrusion 33 is provided in a ring shape around the entire circumference of the tubular portion 31, the cable tie 13 is less likely to slip from the fastening portion 32 in the length direction of the tubular portion 31 around the entire circumference of the fastening portion 32. In addition, for example, an operator or the like can easily visually observe the fastening portion 32 together with the protrusion 33 around the entire circumference of the fastening portion 32.

[0030] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

[0031] In the above embodiment, the wall surface extending in the radial direction of the cylindrical portion 31 to connect the top surface of the protruding portion 33 and the fastening portion 32 may be inclined with respect to the radial direction of the cylindrical portion 31 . 3, a wall surface 53 extending in the radial direction of the cylindrical portion 31 to connect the top surface 52 of the protruding portion 51 and the fastening portion 32 may be configured to be inclined with respect to the radial direction of the cylindrical portion 31 in a direction visible when viewed from the radial outside of the cylindrical portion 31. That is, the pair of wall surfaces 53 in this example are inclined in directions approaching each other as they move toward the radial inside of the cylindrical portion 31. Also, the wall surfaces 53 in this example are inclined so that a cross section cut along the radial direction of the cylindrical portion 31 is linear.

[0032] 4, a wall surface 63 extending in the radial direction of the tubular portion 31 to connect the top surface 62 of the protruding portion 61 and the fastening portion 32 may be configured to be inclined with respect to the radial direction of the tubular portion 31 in a direction visible when viewed from the radial outside of the tubular portion 31. That is, the pair of wall surfaces 63 in this example are inclined in directions approaching each other as they move toward the radial inside of the tubular portion 31. Also, the wall surfaces 63 in this example are inclined so that a cross section cut along the radial direction of the tubular portion 31 is curved.

[0033] By doing so, for example, the workability when tightening the cable tie 13 is improved. More specifically, even if the positioning accuracy of the cable tie 13 is low when tightening the cable tie 13 to the tightening portion 32, the cable tie 13 is guided toward the tightening portion 32 by the wall surfaces 53 and 63 as the cable tie 13 is tightened. Therefore, the workability when tightening the cable tie 13 is improved.

[0034] As shown in FIG. 5, the protruding portion 71 may have an extending portion 73 that extends from a top surface 72 of the protruding portion 71 in a direction covering the outer periphery of the fastening portion 32 . In this way, for example, the cable tie 13 is less likely to slip from the fastening portion 32 in the length direction of the tubular portion 31 .

[0035] In the above embodiment, the protrusion 33 is provided in an annular shape around the entire circumference of the tubular portion 31, but this is not limited to this, and the protrusion 33 may be provided on a portion of the circumference of the tubular portion 31.

[0036] 6, the protruding portion 81 may be provided at one location in the circumferential direction of the cylindrical portion 31. The protruding portion may be provided at a plurality of locations in the circumferential direction of the cylindrical portion 31.

[0037] In this way, it is possible to avoid interference between the protrusion 81 and other members such as the locking portion 42 provided on the cable tie 13. That is, in the above embodiment, there is a risk of interference between the protrusion 33 and the locking portion 42, but in a configuration in which the protrusion 81 is provided on a portion of the circumferential direction of the cylindrical portion 31, it is possible to avoid interference between the protrusion 81 and the locking portion 42 by shifting the positions of the protrusion 81 and the locking portion 42.

[0038] In the above embodiment, the protrusions 33 are provided on both sides of the tightening portion 32 in the longitudinal direction of the tubular portion 31, but this is not limited to this. For example, the protrusions 33 may be provided only on one side of the tightening portion 32 in the longitudinal direction of the tubular portion 31.

[0039] In the above embodiment, the tightening portion 32 has a smaller outer diameter than other portions of the tubular portion 31 in the longitudinal direction, but this is not limited to this. For example, the tightening portion 32 may have the same outer diameter as other portions of the tubular portion 31 where no protrusion 33 is provided.

[0040] In the above embodiment, the electric wire member 11 has a configuration including the electric wire 21 and the corrugated tube 22 as an exterior member, but is not limited thereto, and may have, for example, a configuration in which the exterior member is a cylindrical member other than the corrugated tube 22. Of course, the electric wire member 11 may have a plurality of electric wires 21, and the plurality of electric wires 21 may be covered with the corrugated tube 22.

[0041] The technical ideas that can be understood from the above will be described below. (i) The grommet according to any one of claims 1 to 6, wherein the protruding portion has an extending portion that extends from a top surface of the protruding portion in a direction covering an outer circumferential side of the fastening portion.

[0042] According to this configuration, the protrusion has an extending portion that extends from the top surface of the protrusion in a direction covering the outer circumferential side of the fastening portion, so that, for example, the cable tie is less likely to slip from the fastening portion in the longitudinal direction of the tubular portion. [Explanation of symbols]

[0043] 10 Wire harness with grommet 11 Electrical wiring materials 12 Grommet 13 Cable ties 21 Electric wire 22 Corrugated tube 23 Large diameter section 24 Small diameter section 31 Cylindrical part 32 Fastening part 33 Protrusion 41 Belt 42 Rock Section 51 Protrusion 52 Top surface 53 Wall 61 Protrusion 62 Top surface 63 Wall 71 Protrusion 72 Top surface 73 Extension part 81 Protrusion

Claims

1. A cylindrical portion into which the electric wire member can be inserted is provided, The electric wire member includes an electric wire and a corrugated tube as an exterior member covering the electric wire, The cylindrical portion extends with an axial length, a fastening portion provided at a portion of the tubular portion in an axial direction, the fastening portion fastening a cable tie from an outer periphery thereof in a state in which the corrugated tube is inserted; a protruding portion provided adjacent to the fastening portion in the axial direction of the cylindrical portion, protruding radially outward from the cylindrical portion, and having a protruding amount set so as to protrude radially outward beyond the cable tie; A grommet wherein the inner diameter of the tubular portion is constant over the entire length of the tubular portion, and the outer diameter of the fastening portion is smaller than the outer diameter of other portions of the tubular portion in the axial direction.

2. The grommet according to claim 1 , wherein the protrusions are provided on both sides of the fastening portion in the axial direction of the cylindrical portion.

3. The grommet according to claim 1 or 2, wherein the protrusion is provided in an annular shape around the entire circumference of the cylindrical portion.

4. The grommet according to claim 1 or 2, wherein the protrusion is provided on a portion of the tubular portion in a circumferential direction.

5. A grommet as described in any one of claims 1 to 4, wherein a wall surface extending radially of the tubular portion to connect the top surface of the protrusion and the fastening portion is inclined relative to the radial direction of the tubular portion in a direction that is visible when viewed from the radial outside of the tubular portion.

6. The grommet according to any one of claims 1 to 5, The electric wire member; The cable tie and A grommeted wire harness comprising:

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