CN112332337A - Grommet - Google Patents
Grommet Download PDFInfo
- Publication number
- CN112332337A CN112332337A CN202010722028.1A CN202010722028A CN112332337A CN 112332337 A CN112332337 A CN 112332337A CN 202010722028 A CN202010722028 A CN 202010722028A CN 112332337 A CN112332337 A CN 112332337A
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- China
- Prior art keywords
- annular
- bottom wall
- cylindrical member
- hole
- grommet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L5/00—Devices for use where pipes, cables or protective tubing pass through walls or partitions
- F16L5/02—Sealing
- F16L5/10—Sealing by using sealing rings or sleeves only
Abstract
The invention provides a grommet, which can prevent an annular bushing from falling off from a grommet main body when the grommet main body receives external force from the outside of a partition wall or a cable bundle. The grommet (1) has: an inner tube member (5) having a hollow tubular shape defining a through-hole (4) through which the cable bundle is inserted; a bottom wall portion (6) extending outward in the radial direction (A) from the outer peripheral surface (31) of the inner cylindrical member; an outer cylinder member (7) having a hollow cylindrical shape surrounding the inner cylinder member; and an annular bush (3) fitted into an annular groove (8) defined between the inner cylindrical member and the outer cylindrical member, the annular bush being disposed at a predetermined interval from the bottom wall portion, and being provided with a communication hole (63) that communicates a 1 st space (61) defined between the annular bush and the bottom wall portion with a 2 nd space (62) present on the opposite side of the 1 st space across the annular bush.
Description
Technical Field
The present invention relates to a grommet that is attached to a through hole formed in a partition wall, protects a cable bundle inserted through the through hole, and seals the through hole, and more particularly, to a grommet that includes a grommet body inserted into the through hole and a bushing inserted into a fitting groove formed in the grommet body.
Background
Conventionally, when inserting a cable bundle into a through hole formed in a partition wall, a grommet is attached to the through hole, and the cable bundle is inserted into an insertion hole formed in the grommet, thereby protecting the cable bundle and sealing the through hole. Such a grommet is required to have high sealing performance for waterproofing, dust proofing, and the like, when used in a through hole formed in a partition wall that partitions an inside and an outside of a vehicle, such as a partition wall that partitions an inside of a storage chamber of an IPU (power supply circuit control unit).
Therefore, a grommet including a grommet body inserted into a through hole and a bush fitted into an insertion groove formed in the grommet body is known (patent document 1). The grommet of patent document 1 includes: a grommet main body formed of an elastic insulating material and inserted into a wire insertion hole (through hole) of a plate (partition wall); and a bush having a cylindrical fitting portion fitted in an annular fitting groove formed in an outer peripheral portion of the wire harness insertion center hole corresponding to the plate fitting portion of the grommet main body, the cylindrical fitting portion fitted in the fitting groove inwardly deflecting an inner cylindrical portion forming the wire harness insertion center hole to reduce the diameter thereof, and outwardly deflecting an outer cylindrical portion fitted in the wire insertion hole of the plate to expand the diameter thereof, thereby improving the close contact (sealing) between the grommet main body and the plate and the close contact between the grommet main body and the wire.
Documents of the prior art
Patent document 1: japanese laid-open patent publication No. 8-185746
Disclosure of Invention
Problems to be solved by the invention
However, in the grommet described in patent document 1, when the grommet main body is used in a through hole formed in a partition wall that partitions the vehicle exterior side and the vehicle interior side, when an external force such as water pressure is applied from the outside of the partition wall (vehicle exterior side) or an external force due to displacement of the cable bundle in the through hole is applied from the cable bundle, a load in the direction of pulling out the grommet due to the external force may act on the grommet main body, and the bush may fall off from the grommet main body. If the bush falls off from the grommet main body, the sealing performance of the grommet against the through hole is naturally impaired.
In view of the above background, an object of the present invention is to provide a grommet that can prevent a bush from falling off from a grommet body when an external force is applied to the grommet body from the outside of a partition wall or a cable bundle.
Means for solving the problems
In order to solve the above problem, one embodiment of the present invention is a grommet 1 that is attached to a through hole 11 formed in a partition wall 10, passes a cable bundle through the through hole, and seals the through hole, the grommet including: an inner tube member 5 defining a through hole 4 through which the cable bundle is inserted, the inner tube member having a hollow tubular shape inserted into the through hole; a bottom wall portion 6 extending outward in the radial direction a from the outer peripheral surface 31 of the inner cylindrical member; an outer cylinder member 7 having a hollow cylindrical shape surrounding the inner cylinder member, one axial end of the outer cylinder member 7 being formed continuously with the outer periphery of the bottom wall portion, an opening 23 being provided at the other axial end of the outer cylinder member 7, and a fitting groove 21 for fitting with the edge portion 12 of the through hole being provided in an outer peripheral portion 22 of the outer cylinder member 7; and an annular bush 3 fitted in an annular groove 8 defined between the inner cylindrical member and the outer cylindrical member, the annular bush being disposed at a predetermined interval from the bottom wall portion, and provided with a communication hole 63 for communicating a 1 st space 61 defined between the annular bush and the bottom wall portion with a 2 nd space 62 existing on the opposite side of the 1 st space across the annular bush.
According to this configuration, when the grommet main body including the inner tubular member, the bottom wall portion, and the outer tubular member receives an external force from the bottom wall portion side (i.e., the outside of the partition wall) or the cable harness, the external force can be released to the 2 nd space via the 1 st space and the communication hole. This prevents a load in the pull-out direction from acting on the annular bush due to an external force. Therefore, when the grommet main body receives an external force from the outside of the partition wall or the cable harness, the annular bush can be prevented from falling off from the grommet main body.
In the above structure, the communication hole may be an annular space formed between the annular bush and the inner cylindrical member.
According to this configuration, since the gap can be provided between the annular bush and the inner tubular member by the annular space that is the communication hole, even when the inner tubular member receives an external force from the cable harness, the displacement of the inner tubular member radially outward by the external force can be allowed by the gap. Thus, the outer cylinder member can be prevented from being pressed radially outward through the annular bush and deformed by the radially outward displacement of the inner cylinder member. Therefore, when the inner tube member receives an external force from the cable harness, the sealing of the outer tube member to the through hole can be reliably maintained, and the annular bush can be prevented from falling off from the grommet main body.
In the above configuration, the annular bush may be disposed at a position overlapping the partition wall in the axial direction B of the outer cylindrical member.
According to this configuration, since the annular bush is arranged in the radial direction on the same line as the outer cylinder member and the edge of the through hole, the outer cylinder member can be pressed against the edge of the through hole with a stronger force by the annular bush. This improves the adhesion between the outer tube member and the edge of the through hole.
In the above configuration, an opening side portion 22a of the outer peripheral portion of the outer cylindrical member, which is closer to the opening side than the fitting groove in the axial direction of the outer cylindrical member, may have a tapered surface 26 that is inclined radially inward toward the opening side of the through hole.
With this configuration, the outer tube member can be easily inserted into the through hole.
In the above configuration, a bottom wall side portion 22b on the outer peripheral portion of the outer cylindrical member, which is closer to the bottom wall side than the fitting groove in the axial direction of the outer cylindrical member, may be formed as: the outer tube member is provided with an outer circumferential portion that is radially outwardly projected from an opening side portion of the outer tube member on the opening side of the through hole in the axial direction of the outer tube member than the fitting groove.
According to this structure, the contact area between the side surface 21b on the bottom wall side portion side of the fitting groove and the side surface 13 of the partition wall can be increased, and therefore the engagement force between the fitting groove and the partition wall in the direction in which the outer cylinder member is inserted into the through hole can be increased.
In the above configuration, the thickness t1 in the axial direction of the bottom wall portion may be set to: a thickness t2 between the bottom surface of the fitting groove and the inner peripheral surface of the outer cylindrical member, and a thickness in the radial direction of a bottom wall portion of the outer peripheral portion of the outer cylindrical member on the bottom wall side of the fitting groove in the axial direction of the outer cylindrical member.
According to this configuration, the rigidity of the bottom wall portion of the outer peripheral portion of the outer cylindrical member can be made higher than the rigidity of the bottom wall portion, and therefore, when the grommet main body constituted by the inner cylindrical member, the bottom wall portion, and the outer cylindrical member receives an external force from the bottom wall portion side (i.e., the outside of the partition wall) or the cable harness, the corner portion 27 where the side surface 41 of the bottom wall portion intersects with the inner peripheral surface 25 of the outer cylindrical member can be used as a displacement starting point. This can guide the displacement direction of the outer cylinder member and the inner cylinder member in the axial direction, and thus can prevent radial displacement of the outer cylinder member and the inner cylinder member. Therefore, when the grommet main body receives an external force from the outside of the partition wall or the cable harness, the sealing of the outer tube member to the through hole can be reliably maintained, and the annular bush can be prevented from falling off from the grommet main body.
In the above configuration, the outer tube member may have at least one protruding portion 42 protruding radially inward at the end portion of the inner circumferential surface on the opening portion side, and the annular bush may include: an axial end surface 54 abutting against a side surface of the bottom wall portion of the protruding portion; and at least one engaging portion 55 formed to project from the axial end surface in the axial direction of the annular bush, extend radially outward of the annular bush, and engage with the side end surface 43 on the opening portion side of the outer tube member.
According to this configuration, the annular bush can be clamped and fixed from both axial sides at the end portion on the opening portion side of the outer tubular member by the abutment of the side surface on the bottom wall portion side of the protruding portion of the outer tubular member with the axial end surface of the annular bush and the engagement of the engagement portion of the annular bush with the side end surface of the outer tubular member. Thus, the annular bush can be firmly fixed to the outer tube member, and therefore the annular bush can be more reliably prevented from coming off the outer tube member. Further, since the axial position of the annular bush in the annular groove can be positioned, the annular bush can be disposed at a predetermined interval from the bottom surface of the bottom wall portion.
In the above configuration, the plurality of projecting portions may be provided at intervals in the circumferential direction of the outer cylinder member, the plurality of engaging portions may be provided at intervals in the circumferential direction of the annular bush, and the engaging portions may be arranged to intersect with the projecting portions in the circumferential direction of the outer cylinder member.
According to this configuration, the engaging portion of the annular bush is disposed between the protruding portions of the outer tubular member, whereby the annular bush can be fitted into the annular groove at a correct position in the circumferential direction.
In the above configuration, a mark 45 for positioning the position of the engagement portion in the circumferential direction of the outer tube member may be provided on the side end surface of the outer tube member.
According to this configuration, since the engaging portion of the annular bush can be disposed along the circumferential direction of the outer cylinder member so as to intersect with the protruding portion, the annular bush can be reliably fitted into the annular groove.
In the above configuration, the marks may be grooves 45a and 45b formed at predetermined intervals from each other.
With this configuration, the engaging portion of the annular bush can be prevented from jumping over the mark and becoming a state in which the annular bush is not completely fitted into the annular groove.
Drawings
Fig. 1 is an exploded longitudinal sectional view showing the structure of a grommet of the present invention.
Fig. 2 is a longitudinal sectional view showing a state in which the grommet of the present invention is assembled.
Fig. 3 is an enlarged view of a part of the grommet main body, and corresponds to fig. 1.
Fig. 4 is a top view of the grommet body.
Fig. 5 is an exploded perspective view showing the structure of the grommet of the present invention.
Fig. 6 is a perspective view showing a state where the grommet of the present invention is assembled.
Fig. 7 is a view for explaining an operation of fitting the annular bush into the annular groove, where (a) shows a state where a part of the annular bush is fitted into the annular groove, and (B) shows a state where the entire annular bush is fitted into the annular groove.
Fig. 8 is a plan view of the grommet main body when the annular bushing is fitted into the annular groove, and corresponds to fig. 6.
Fig. 9 is an enlarged view of a part of the grommet main body, and corresponds to fig. 2.
Description of the reference symbols
1: a grommet;
3: an annular bushing;
4: a through hole;
5: an inner cylinder member;
6: a bottom wall portion;
7: an outer cylinder member;
8: an annular groove;
10: a partition wall;
11: a through hole;
12: a rim portion;
13: a side surface;
21: a fitting groove;
21 a: a bottom surface;
21 b: a side surface;
22: a peripheral portion;
22 a: an opening side portion;
22 b: a bottom wall side portion;
23: an opening part;
25: an inner peripheral surface;
26: a conical surface;
27: a corner portion;
41: a side surface;
42: a protrusion;
43: a side end face;
45: marking;
45 a: a groove;
45 b: a groove;
54: the bulkhead inner end face (axial end face);
55: a fastening part;
61: 1 st space;
62: a 2 nd space;
63: the 3 rd space (communication hole);
a: radial direction;
b: axial direction;
t 1: the axial thickness of the bottom wall portion;
t 2: the thickness of the embedding groove.
Detailed Description
Hereinafter, embodiments of the grommet according to the present invention will be described in detail with reference to the drawings. Arrow a in the drawings of a portion of the drawings refers to the radial direction of the respective components, and arrow B refers to the axial direction of the respective components.
The grommet of the present invention is attached to a through hole formed in a partition wall that partitions a vehicle exterior side and a vehicle interior side of a vehicle, and is used for protecting a cable harness inserted through the through hole and sealing the through hole. The partition wall is not limited to this, but may be, for example, an indoor partition wall and an outdoor partition wall that partition a storage room of an IPU (power supply circuit control device) provided under a trunk floor or the like in the rear of the vehicle.
As shown in fig. 1 and 2, the grommet 1 includes: a grommet main body 2 inserted into a through hole 11 formed in the partition wall 10; and an annular bush 3 fitted into an annular groove 8, described later, of the grommet main body 2. The grommet main body 2 serves to protect a cable harness (not shown) inserted through the through-hole 11 and seal the through-hole 11. The annular bush 3 serves to improve the adhesion (sealing) between the grommet main body 2 and the edge 12 of the through-hole 11.
The grommet main body 2 is integrally molded from an elastic material such as synthetic rubber so as to be elastically deformable in the radial direction a when inserted into the through-hole 11. The annular bush 3 is integrally molded from a material such as a synthetic resin which is harder than the grommet main body 2 so that the grommet main body 2 can be bent toward the edge portion 12 of the through hole 11 when fitted into the annular groove 8 of the grommet main body 2, thereby improving the adhesion between the grommet main body 2 and the edge portion 12 of the through hole 11.
The grommet main body 2 has: an inner tube member 5 having a hollow tubular shape inserted into the through hole 11; a bottom wall portion 6 extending outward in the radial direction a from the outer peripheral surface 31 of the inner cylindrical member 5; and an outer cylindrical member 7 having a hollow cylindrical shape surrounding the inner cylindrical member 5, one end in the axial direction of which is formed continuously with the outer periphery of the bottom wall portion 6, and the other end in the axial direction of which has an opening portion 23, and an outer peripheral portion 22 of the outer cylindrical member 7 is provided with a fitting groove 21 for fitting with the edge portion 12 of the through hole 11.
The inner cylindrical member 5 has an outer peripheral surface 31 and an inner peripheral surface 32, and the inner peripheral surface 32 of the inner cylindrical member 5 defines a through hole 4 through which a cable bundle, not shown, in which a plurality of wires are bundled together is inserted. The inner tubular member 5 has an elongated shape extending in the axial direction B, and a portion of the inner tubular member 5 on the opening 23 side (hereinafter also referred to as "inside of the partition wall") is formed in an elongated tubular shape protruding outward in the axial direction B by a predetermined length from an opening 23 of the outer tubular member 7, which will be described later. Further, a portion of the inner cylindrical member 5 on the bottom wall portion 6 side (hereinafter also referred to as "partition wall outer side") is formed in an elongated tubular shape protruding by a predetermined length to the opposite side of the portion on the partition wall inner side (see fig. 5 and 6).
The outer cylindrical member 7 includes an outer peripheral portion 22 extending in the axial direction B from the outer periphery of the bottom wall portion 6, and an opening 23 opening toward the partition wall inner side, and the outer peripheral portion 22 has an outer peripheral surface 24 and an inner peripheral surface 25. The fitting groove 21 is formed in the outer peripheral surface 24 of the outer peripheral portion 22 in the circumferential direction of the outer cylindrical member 7. The outer tubular member 7 is provided concentrically with the inner tubular member 5 at a predetermined interval from the outer peripheral surface 31 of the inner tubular member 5. The annular groove 8 into which the annular bush 3 is fitted is defined by the inner peripheral surface 25 of the outer cylindrical member 7, the side surface 41 of the bottom wall portion 6 facing the inside of the partition wall, and the outer peripheral surface 31 of the inner cylindrical member 5.
As shown in fig. 3, an opening side portion 22a of the outer peripheral portion 22 of the outer cylindrical member 7 on the inner side of the partition wall (on the opening 23 side) with respect to the fitting groove 21 in the axial direction B of the outer cylindrical member 7 has a tapered surface 26 inclined inward in the radial direction a as it approaches the inner side of the partition wall. This facilitates insertion of the outer tube member 7 into the through hole 11.
Further, a bottom wall portion 22B of the outer peripheral portion 22 of the outer cylindrical member 7, which is located on the partition wall outer side (bottom wall portion 6 side) of the fitting groove 21 in the axial direction B of the outer cylindrical member 7 (i.e., located on the opposite side of the opening side portion 22a with respect to the fitting groove 21), is formed to protrude radially outward of the opening side portion 22 a. This can increase the contact area between the side surface 21b on the bottom wall side 22b side of the fitting groove 21 and the side surface 13 (see fig. 1) on the partition wall outer side of the partition wall 10, and thus can improve the engagement force between the fitting groove 21 and the partition wall 10 in the direction in which the outer cylinder member 7 is inserted into the through hole 11.
The thickness t1 of the bottom wall portion 6 in the axial direction B is set to be smaller than the thickness t2 (hereinafter also referred to as "fitting groove thickness t 2") between the bottom surface 21a of the fitting groove 21 and the inner circumferential surface 25 of the outer cylindrical member 7 and the thickness in the radial direction a of the bottom wall side portion 22B of the outer circumferential portion 22 of the outer cylindrical member 7. In the present embodiment, the thickness of the bottom wall-side portion 22b in the radial direction a is set to be equal to or greater than the fitting groove thickness t 2. Therefore, in the present embodiment, the thickness t1 in the axial direction B of the bottom wall portion 6 is set to be smaller than the fitting groove thickness t 2. Thus, the rigidity of the bottom wall portion 22b of the outer peripheral portion 22 of the outer cylindrical member 7 can be made higher than the rigidity of the bottom wall portion 6, and therefore, when the grommet main body 2 receives an external force from the outside of the partition wall or the cable harness, the corner portion 27 where the side surface 41 of the bottom wall portion 6 and the inner peripheral surface 25 of the outer cylindrical member 7 intersect can be used as a displacement start point. In the present embodiment, the thickness of the bottom wall side portion 22B in the radial direction a is set to be equal to or greater than the fitting groove thickness t2, but is not particularly limited as long as the thickness of the bottom wall side portion 22B in the radial direction a is greater than the thickness of the bottom wall portion 6 in the axial direction B.
The outer cylindrical member 7 has a protruding portion 42 protruding a predetermined length inward in the radial direction a at an end portion of the inner circumferential surface 25 on the inside of the partition wall. The protruding portion 42 is formed such that: the side surface 42a on the bottom wall 6 side can abut against an abutment portion 56 (described later) of the annular bush 3 (see fig. 9).
As shown in fig. 4, 3 projections 42 are provided on a side end surface 43 on the inner side of the partition wall of the outer cylindrical member 7 at equal intervals in the circumferential direction of the outer cylindrical member 7. Each of the projections 42 is formed to have a predetermined circumferential width. The portions between the respective protrusions 42 in the circumferential direction of the outer cylindrical member 7 are referred to as spacers 44. Each of the spacers 44 is formed to have a circumferential width in which an engagement portion 55 (described later) of the annular bush 3 can be disposed (see fig. 8).
Therefore, the projections 42 and the spacers 44 are arranged alternately in the circumferential direction of the outer tubular member 7 on the side end surface 43 of the outer tubular member 7. Three protrusions 42 are provided at equal intervals, and therefore three spacers 44 are also provided at equal intervals. Therefore, the spacer 44 is located at a position opposite to the protruding portion 42 in the circumferential direction of the outer cylindrical member 7. In the present embodiment, three protruding portions 42 are provided, but the number of protruding portions 42 is not particularly limited as long as the engaging portion 55 of the annular bush 3 can be disposed in the spacer portion 44.
In the present embodiment, the protruding portions 42 and the spacing portions 44 are arranged at equal intervals, but the arrangement intervals of the protruding portions 42 and the spacing portions 44 may not be equal intervals. As will be described later in detail, when the cable bundle inserted through the through hole 4 is displaced in the through hole 4, an external force generated by the displacement is applied to the inner cylindrical member 5, and the inner cylindrical member 5 is displaced in the radial direction a. At this time, when the displacement in the radial direction a of the inner cylindrical member 5 is large, the outer peripheral surface 31 of the inner cylindrical member 5 may interfere with the engagement portion 55 of the annular bush 3, and therefore the engagement portion 55 is preferably arranged at a position not interfering with the inner cylindrical member 5 based on the expected displacement direction of the inner cylindrical member 5. Therefore, the projecting portion 42 and the spacing portion 44 can be appropriately arranged at positions where the inner cylindrical member 5 does not interfere with the engagement portion 55 even when the displacement in the radial direction a of the inner cylindrical member 5 is large.
Further, a mark 45 for positioning a position of an engagement portion 55, which will be described later, of the annular bush 3 in the circumferential direction of the outer cylindrical member 7 is provided at a position corresponding to the spacer portion 44 on the side end surface 43. The engaging portion 55 of the annular bush 3 can be disposed at the spacer portion 44 of the outer tubular member 7 by the mark 45.
The mark 45 is provided as a pair of grooves 45a, 45b formed at a predetermined interval from each other on the side end surface 43 of the outer tubular member 7. If the marks 45 are provided in the grooves 45a and 45b, the engaging portion 55 of the annular bush 3 can be prevented from jumping over the marks 45 and becoming a state in which the annular bush 3 is not completely fitted into the annular groove 8.
The pair of grooves 45a, 45b are formed to have a circumferential width slightly larger than a circumferential width of the engagement portion 55 therebetween so that the engagement portion 55 of the annular bush 3 can be disposed between the pair of grooves 45a, 45 b. The mark 45 is not limited to the pair of grooves 45a and 45b, and may be provided by, for example, color, symbol, or the like.
Returning to fig. 1 and 2, the annular liner 3 has an annular shape that can be inserted through the inner tube member 5 at a predetermined interval. The annular bush 3 is fitted into the annular groove 8 from the opening 23 of the outer tube member 7, and is disposed at a predetermined interval from the side surface 41 of the bottom wall portion 6. The annular bush 3 has: an outer peripheral surface 51 which is in close contact with the inner peripheral surface 25 of the outer cylindrical member 7; an inner peripheral surface 52 that forms an annular 1 st space 61 (see fig. 9) with the outer peripheral surface 31 of the inner cylindrical member 5; a bottom wall side end surface 53 facing the side surface 41 of the bottom wall portion 6; and a bulkhead inner end surface 54 that faces the bulkhead inner side.
The annular liner 3 further includes an engagement portion 55 (see fig. 5 and 6), and the engagement portion 55 is formed to protrude from the bulkhead inner end surface 54 by a predetermined length in the axial direction B of the annular liner 3 and to extend by a predetermined length outward in the radial direction a of the annular liner 3. The engaging portion 55 is formed as: when the annular bush 3 is fitted into the annular groove 8, it can engage with the side end surface 43 of the outer tube member 7 (see fig. 6 and 8).
Three engaging portions 55 are provided on the bulkhead inner end surface 54 of the annular liner 3 at equal intervals along the circumferential direction of the annular liner 3. Each engaging portion 55 is formed to have a circumferential width that can be arranged in the space portion 44 of the side end surface 43 of the outer tubular member 7 (see fig. 8). A portion between the engagement portions 55 in the circumferential direction of the annular bush 3 is referred to as an abutment portion 56.
Therefore, the engaging portions 55 and the abutting portions 56 are alternately arranged in the circumferential direction of the annular liner 3 on the bulkhead inner end surface 54 of the annular liner 3. Since the engaging portions 55 are provided in three at equal intervals, the abutting portions 56 are also provided in three at equal intervals. Therefore, the contact portion 56 is located at a position opposite to the engagement portion 55 in the circumferential direction of the annular bush 3. In the present embodiment, three engaging portions 55 are provided, but the number of the engaging portions 55 is not particularly limited as long as the engaging portions can be arranged at the spacer portions 44 of the side end surfaces 43 of the outer tubular member 7. In the present embodiment, the engagement portions 55 and the contact portions 56 are arranged at equal intervals, but the arrangement intervals of the engagement portions 55 and the contact portions 56 may not be equal intervals. The engagement portion 55 and the contact portion 56 can be appropriately arranged at positions where the inner cylindrical member 5 does not interfere with the engagement portion 55 even when the displacement of the inner cylindrical member 5 in the radial direction a is large as described above.
The annular liner 3 is disposed at a position overlapping the partition wall 10 in the axial direction B in the annular groove 8 (see fig. 2). Thus, the annular bush 3 is arranged in the radial direction a in line with the outer cylindrical member 7 and the partition wall 10, and therefore the outer cylindrical member 7 can be pressed against the edge 12 of the through hole 11 by the annular bush 3 with a stronger force. This can improve the adhesion between the outer tube member 7 and the edge 12 of the through hole 11.
The outer diameter of the annular bush 3 is set to be slightly larger than the inner diameter of the annular groove 8 so that when the annular bush 3 is fitted into the annular groove 8, the outer circumferential surface 51 of the annular bush 3 presses the inner circumferential surface 25 of the outer cylindrical member 7 to flex the outer cylindrical member 7 outward and expand the diameter.
The annular bush 3 is disposed concentrically with the outer cylindrical member 7. Thus, the annular bush 3 can uniformly press the outer tube member 7 outward in the radial direction a in the circumferential direction thereof, and thus the close contact between the outer tube member 7 and the edge 12 of the through hole 11 can be uniformly improved in the circumferential direction.
When the grommet 1 configured as described above is attached to the through hole 11 of the partition wall 10, first, the inner tubular member 5 of the grommet main body 2 is inserted into the through hole 11 from the outside of the partition wall, and then, the outer tubular member 7 of the grommet main body 2 is inserted into the through hole 11 from the outside of the partition wall. Then, the annular bush 3 is fitted into the annular groove 8 of the grommet main body 2 from the inside of the partition wall.
When the annular bush 3 is fitted into the annular groove 8, first, as shown in fig. 7 (a), the abutting portion 56 of the bulkhead inner end surface 54 of the annular bush 3 is obliquely inserted into the annular groove 8 of the grommet main body 2, and abuts against and is locked to the protruding portion 42 of the outer tube member 7. The contact portion 56 of the annular bush 3 contacts the side surface 42a of the bottom wall portion 6 of the protruding portion 42.
Next, as indicated by an arrow 46, the engagement portion 55 located on the opposite side in the circumferential direction of the contact portion 56 locked to the protruding portion 42 of the outer cylindrical member 7 is press-fitted into the annular groove 8. As described above, the engagement portion 55 of the annular bush 3 is located on the opposite side of the contact portion 56 in the circumferential direction. As a result, as shown in fig. 7 (B), the entire annular bush 3 is fitted into the annular groove 8. At this time, the engaging portion 55 of the annular bush 3 is seated on the side end surface 43 of the outer tube member 7.
Thereafter, as shown in fig. 8, the position of the engaging portion 55 of the annular bush 3 in the circumferential direction of the outer cylindrical member 7 is confirmed by the pair of grooves 45a, 45b of the side end surface 43 of the outer cylindrical member 7. When the engaging portion 55 of the annular bush 3 is positioned between the pair of grooves 45a and 45b, the engaging portion 55 of the annular bush 3 is disposed at the spacer 44 of the outer tube member 7, indicating that the annular bush 3 is accurately fitted into the annular groove 8.
On the other hand, when the engagement portion 55 of the annular bush 3 is not located between the pair of grooves 45a and 45b, the engagement portion 55 is not disposed at the spacer 44 of the outer tube member 7, indicating that the annular bush 3 is not correctly fitted into the annular groove 8. At this time, the annular bush 3 is rotated in the circumferential direction and positioned so that the annular bush 3 is disposed between the pair of grooves 45a, 45 b.
In this way, the position of the engagement portion 55 of the annular bush 3 in the circumferential direction of the outer cylindrical member 7 can be easily positioned by the pair of grooves 45a and 45 b. Thereby, the engaging portion 55 of the annular bush 3 can be arranged at the spacing portion 44 of the outer tubular member 7. Further, if the engaging portion 55 of the annular bush 3 is not disposed at the partition portion 44 of the outer tubular member 7, the engaging portion 55 rises above the protruding portion 42, and therefore the annular bush 3 cannot be fitted into the annular groove 8 accurately.
As shown in fig. 9, when the annular liner 3 is fitted into the annular groove 8, the annular liner 3 is disposed at a predetermined interval from the bottom wall portion 6, and therefore, a 1 st space 61 is formed between the bottom wall side end surface 53 of the annular liner 3 and the side surface 41 of the bottom wall portion 6. Further, a 2 nd space 62 is present on the opposite side of the 1 st space 61 (i.e., inside the partition wall) with the annular liner 3 interposed therebetween. When the annular liner 3 is fitted into the annular groove 8, the annular liner 3 is inserted through the inner tubular member 5 at a predetermined interval, and thus an annular 3 rd space 63 is formed between the inner peripheral surface 52 of the annular liner 3 and the outer peripheral surface 31 of the inner tubular member 5. The 3 rd space 63 functions as a communication hole for communicating the 1 st space 61 with the 2 nd space 62.
Thus, when the bottom wall portion 6 of the outer tube member 7 of the grommet main body 2 receives an external force such as water pressure from the outside of the partition wall (vehicle exterior side), the external force can be released to the 2 nd space 62 inside the partition wall via the 1 st space 61 and the 3 rd space 63. This can prevent the grommet main body 2 from being displaced inward of the partition wall in the axial direction B by external pressure and pressing the annular bush 3, or prevent the air pressure in the gap between the bottom wall portion 6 and the annular bush 3 from increasing by external pressure, and thus prevent a load in the extraction direction from acting on the annular bush 3. Therefore, the annular bush 3 is prevented from falling off the grommet body 2 when the grommet body 2 receives an external force from the outside of the partition wall.
Further, when the inner tube member 5 of the grommet main body 2 receives an external force from the cable harness caused by the displacement of the cable harness in the insertion hole 4, the external force can be released to the 2 nd space 62 inside the partition wall via the 1 st space 61 and the 3 rd space 63. Further, since the gap can be provided between the annular bush 3 and the inner tube member 5 by the 3 rd space 63, even when the inner tube member 5 receives an external force from the cable harness, the displacement of the inner tube member 5 outward in the radial direction a due to the external force can be allowed by the gap. This prevents the outer tube member 7 from being pressed radially outward a via the annular bush 3 by displacement of the inner tube member 5 radially outward a and deformed. Therefore, when the inner tube member 5 receives an external force from the cable harness, the sealing of the outer tube member 7 to the through hole 11 can be reliably maintained, and the annular bush 3 can be prevented from falling off from the grommet main body 2.
Further, as shown in fig. 3, by setting the thickness t1 in the axial direction B of the bottom wall portion 6 of the outer tube member 7 to be smaller than the fitting groove thickness t2, the rigidity of the bottom wall portion 22B of the outer peripheral portion 22 of the outer tube member 7 can be made higher than the rigidity of the bottom wall portion 6, and therefore, when the grommet main body 2 receives an external force from the outside of the partition wall or the cable harness, the corner portion 27 where the side surface 41 of the bottom wall portion 6 and the inner peripheral surface 25 of the outer tube member 7 intersect can be used as a displacement start point. This can guide the displacement direction of the outer cylindrical member 7 and the inner cylindrical member 5 in the axial direction B, and thus can prevent displacement in the radial direction a of the outer cylindrical member 7 and the inner cylindrical member 5. Therefore, when the grommet main body 2 receives an external force from the outside of the partition wall or the cable harness, the sealing of the through hole 11 by the outer tube member 7 can be reliably maintained, and the annular bush 3 can be prevented from falling off from the grommet main body 2.
As shown in fig. 9 and 2, the annular bush 3 can be clamped and fixed to the end portion inside the partition wall of the outer cylindrical member 7 from both sides in the axial direction B by the abutment of the protruding portion 42 of the outer cylindrical member 7 with the abutment portion 56 of the annular bush 3 and the engagement of the engagement portion 55 of the annular bush 3 with the side end surface 43 of the outer cylindrical member 7. This can firmly fix the annular bush 3 to the outer tube member 7, and thus can more reliably prevent the annular bush 3 from coming off the outer tube member 7. Further, since the position of the annular bush 3 in the axial direction B in the annular groove 8 can be thereby positioned, the annular bush 3 can be disposed at a predetermined interval with respect to the side surface 41 of the bottom wall portion 6.
The present invention has been described above with reference to specific embodiments, but these embodiments are merely illustrative, and the present invention is not limited to these embodiments. The grommet according to the present invention shown in the above embodiment is not necessarily required to have all of the respective components, and may be appropriately selected at least within a range not departing from the gist of the present invention.
Claims (10)
1. A grommet that is fitted into a through-hole formed in a partition wall, passes a cable bundle through the through-hole, and seals the through-hole,
said grommet being characterized in that it has:
an inner tube member defining a through hole through which the cable bundle is inserted, the inner tube member having a hollow tubular shape inserted into the through hole,
a bottom wall portion extending radially outward from an outer peripheral surface of the inner cylindrical member;
an outer cylinder member having a hollow cylindrical shape surrounding the inner cylinder member, one axial end of the outer cylinder member being formed continuously with the outer periphery of the bottom wall portion, the outer cylinder member having an opening at the other axial end thereof, and a fitting groove for fitting with an edge portion of the through hole being provided in the outer periphery of the outer cylinder member; and
an annular bushing fitted in an annular groove defined between the inner cylinder member and the outer cylinder member,
the annular bush is disposed at a predetermined interval from the bottom wall, and a communication hole is provided for communicating a 1 st space defined between the annular bush and the bottom wall with a 2 nd space present on the opposite side of the 1 st space across the annular bush.
2. Grommet according to claim 1,
the communication hole is an annular space formed between the annular bush and the inner cylindrical member.
3. Grommet according to claim 1,
the annular liner is disposed at a position overlapping the partition wall in the axial direction of the outer cylinder member.
4. Grommet according to any one of claims 1 to 3,
the outer peripheral portion of the outer cylindrical member has a tapered surface inclined radially inward toward the opening portion side with respect to the fitting groove in the axial direction of the outer cylindrical member.
5. Grommet according to any one of claims 1 to 3,
a bottom wall side portion of the outer peripheral portion of the outer cylindrical member on the bottom wall side of the fitting groove in the axial direction of the outer cylindrical member is formed with: the outer tube member is provided with an outer circumferential portion that is radially outwardly projected from an opening side portion of the outer circumferential portion of the outer tube member on the opening side of the fitting groove in the axial direction of the outer tube member.
6. Grommet according to any one of claims 1 to 3,
the thickness of the bottom wall portion in the axial direction is set to: the thickness between the bottom surface of the fitting groove and the inner circumferential surface of the outer cylindrical member and the thickness in the radial direction of the bottom wall side portion of the outer circumferential portion of the outer cylindrical member on the bottom wall side of the fitting groove in the axial direction of the outer cylindrical member are smaller than each other.
7. Grommet according to any one of claims 1 to 3,
the outer cylinder member has at least one projecting portion projecting radially inward at an end portion of an inner peripheral surface thereof on the opening portion side,
the annular bushing has:
an axial end surface abutting against a side surface of the protruding portion on the bottom wall portion side; and
and at least one engaging portion formed to project from the axial end surface in the axial direction of the annular bush, extend radially outward of the annular bush, and engage with a side end surface on the opening portion side of the outer tube member.
8. Grommet according to claim 7,
a plurality of the projections are provided at intervals from each other in a circumferential direction of the outer cylinder member,
a plurality of the engaging portions are provided at intervals in a circumferential direction of the annular bush,
the engaging portions are arranged along the circumferential direction of the outer cylinder member so as to intersect with the protruding portions.
9. Grommet according to claim 8,
a mark for positioning the position of the engagement portion in the circumferential direction of the outer tube member is provided on the side end surface of the outer tube member.
10. Grommet according to claim 9,
the marks are grooves formed at predetermined intervals from each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-143726 | 2019-08-05 | ||
| JP2019143726A JP7076412B2 (en) | 2019-08-05 | 2019-08-05 | Grommet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112332337A true CN112332337A (en) | 2021-02-05 |
| CN112332337B CN112332337B (en) | 2022-07-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010722028.1A Active CN112332337B (en) | 2019-08-05 | 2020-07-24 | Grommet |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7076412B2 (en) |
| CN (1) | CN112332337B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08185746A (en) * | 1994-12-28 | 1996-07-16 | Yazaki Corp | Grommet |
| JP2005033884A (en) * | 2003-07-09 | 2005-02-03 | Sumitomo Wiring Syst Ltd | Grommet |
| CN201615292U (en) * | 2010-01-19 | 2010-10-27 | 浙江吉利汽车研究院有限公司 | Sealing structure for automobile harness inlet |
| CN105244826A (en) * | 2014-07-03 | 2016-01-13 | 住友电装株式会社 | Grommet |
| JP2016207358A (en) * | 2015-04-17 | 2016-12-08 | 矢崎総業株式会社 | Grommet |
| JP2017010638A (en) * | 2015-06-17 | 2017-01-12 | 住友電装株式会社 | Grommet and wire harness with grommet |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2520972Y2 (en) * | 1991-04-22 | 1996-12-18 | 矢崎総業株式会社 | Grommet |
| JPH0660242U (en) * | 1993-01-18 | 1994-08-19 | 日野自動車工業株式会社 | Grommet |
| JP3236390B2 (en) * | 1993-02-05 | 2001-12-10 | 矢崎総業株式会社 | Grommet |
| JPH10255573A (en) * | 1997-03-06 | 1998-09-25 | Sumitomo Wiring Syst Ltd | Grommet for wire harness |
| JP2007227013A (en) | 2006-02-21 | 2007-09-06 | Honda Motor Co Ltd | Grommet |
| JP2011223747A (en) | 2010-04-09 | 2011-11-04 | Sumitomo Wiring Syst Ltd | Grommet |
| JP2017131056A (en) | 2016-01-21 | 2017-07-27 | 住友電装株式会社 | Grommet |
-
2019
- 2019-08-05 JP JP2019143726A patent/JP7076412B2/en active Active
-
2020
- 2020-07-24 CN CN202010722028.1A patent/CN112332337B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08185746A (en) * | 1994-12-28 | 1996-07-16 | Yazaki Corp | Grommet |
| JP2005033884A (en) * | 2003-07-09 | 2005-02-03 | Sumitomo Wiring Syst Ltd | Grommet |
| CN201615292U (en) * | 2010-01-19 | 2010-10-27 | 浙江吉利汽车研究院有限公司 | Sealing structure for automobile harness inlet |
| CN105244826A (en) * | 2014-07-03 | 2016-01-13 | 住友电装株式会社 | Grommet |
| JP2016207358A (en) * | 2015-04-17 | 2016-12-08 | 矢崎総業株式会社 | Grommet |
| JP2017010638A (en) * | 2015-06-17 | 2017-01-12 | 住友電装株式会社 | Grommet and wire harness with grommet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021027689A (en) | 2021-02-22 |
| CN112332337B (en) | 2022-07-19 |
| JP7076412B2 (en) | 2022-05-27 |
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