JP6915465B2 - Grommet - Google Patents

Description

The present invention relates to a grommet through which a wire rod is inserted.

As a conventional grommet of this kind, for example, the one shown in Patent Document 1 is known.
The grommet shown in Patent Document 1 closes a gap generated between a plurality of wire rods and a partition wall, and plays a role of waterproofing, dustproofing, soundproofing and the like. The grommet is provided with a main body portion, a plurality of through holes formed in the main body portion through which a plurality of wire rods penetrate each, and an engaging portion formed on the outer peripheral surface of the main body portion and engaged with the partition wall. There is. Then, the main body portion forms a plurality of slits extending from the outer peripheral surface to each of the plurality of through holes, and also provides an easy engagement means that facilitates engagement between the engaging portion located between the adjacent slits and the partition wall. Have.

When inserting each wire into each through hole, each slit is widened, and each wire is introduced into each through hole through the widened slit. Since there is a slit, it is not necessary to insert a through hole of the grommet into the end of the wire and then move the grommet to a predetermined position, which improves workability.

JP-A-2009-93903

However, the grommet shown in the conventional patent document 1 has the following problems.
The gaps between the slits formed in the main body of the grommet are not completely eliminated. Therefore, it cannot be said that the grommet has a sufficient waterproof function and dustproof function.
The present invention has been made to solve this conventional problem, and to provide a grommet capable of sufficiently exerting a waterproof function and a dustproof function while maintaining a slit that is expected to improve workability. It is in.

In order to achieve the above object, the grommet according to one aspect of the present invention is a grommet through which a wire rod is inserted, and the grommet is a first grommet portion and a second grommet superposed on the first grommet portion. The first grommet portion is composed of a portion, and has a first through hole through which the wire rod is inserted and a first slit formed so as to reach the outer peripheral surface from the first through hole, and the second grommet portion. The portion has a second through hole through which the wire rod is inserted and a second slit formed so as to reach the outer peripheral surface from the second through hole, and the first grommet portion and the second grommet portion are inserted. In the connected state, the first slit and the second slit overlap at least one point when viewed from the insertion direction of the wire rod.

According to the grommet according to the present invention, in a state where the first grommet portion and the second grommet portion are connected, the first slit and the second slit overlap at least one point when viewed from the insertion direction of the wire rod. Therefore, most of the water droplets and the like that have passed through the gap of the first slit of the first grommet portion are blocked by the second grommet portion, or most of the water droplets and the like that have passed through the gap of the second slit of the second grommet portion. Is blocked by the first grommet portion, so that most of the water droplets and the like cannot pass through the grommet. Thereby, it is possible to provide a grommet capable of sufficiently exerting the waterproof function and the dustproof function of the grommet. Further, since the first grommet portion and the second grommet portion each have slits, the above-mentioned improvement in workability is not impaired.

It is sectional drawing which shows the state that the cable inserted through the opening of a partition wall is supported by the grommet which concerns on 1st Embodiment of this invention. The grommet shown in FIG. 1 is shown, (A) is a plan view, and (B) is a side view of (A) viewed from the left side. The first grommet portion constituting the grommet shown in FIGS. 1 and 2 is shown, (A) is a plan view, and (B) is a front view. The second grommet portion constituting the grommet shown in FIGS. 1 and 2 is shown, (A) is a plan view, and (B) is a front view. It is sectional drawing for demonstrating the method of supporting the cable inserted into the opening of a partition wall by the grommet shown in FIG. 1 and FIG. 2 to the partition wall. A grommet according to a second embodiment of the present invention is shown, (A) is a plan view, and (B) is a side view of (A) viewed from the left side. The first grommet portion constituting the grommet shown in FIG. 6 is shown, (A) is a plan view, and (B) is a front view. The second grommet portion constituting the grommet shown in FIG. 6 is shown, (A) is a plan view, and (B) is a front view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First Embodiment)
The grommet 1 according to the first embodiment of the present invention shown in FIG. 1 closes the opening 31 of the partition wall 30 while inserting the cable 40 as a wire rod. Here, the cable 40 covers a bundle of a plurality of electric wires 41, and the first connector 42 is connected to one end side of the cable 40 (the outer side which is one side of the partition wall 30), and the other end of the cable 40. The second connector 43 is connected to the side (the inner side which is the other side of the partition wall 30). The first connector 42 is connected to, for example, a connector mounted on a circuit board provided in an in-vehicle camera, and the second connector 43 is connected to, for example, a circuit board on the car navigation side.

The grommet 1 closes a gap created between the cable 40 and the partition wall 30 by being fitted into, for example, a circular opening 31 of the partition wall 30, and is from the outer side, which is one side of the partition wall 30, to the other side of the partition wall. It has a waterproof function and a dustproof function to prevent water droplets from entering the inside.

As shown in FIGS. 1 and 2 (A) and 2 (B), the grommet 1 includes a first grommet portion 10 and a second grommet portion 20 connected so as to overlap the first grommet portion 10. Here, as shown in FIGS. 1 to 3 (A) and 3 (B), the first grommet portion 10 includes a first main body portion 11 and a closed portion 12 projecting from the first main body portion 11. , Formed integrally with a rubber material (eg ethylene propylene rubber). The first main body portion 11 is formed in a disk shape having a diameter larger than that of the opening 31 of the partition wall 30. The closing portion 12 is formed in a cylindrical shape, has the same central axis as the first main body portion 11, and is formed so as to protrude from the circular surface of the first main body portion 11. The closed portion 12 has an outer diameter smaller than that of the first main body portion 11 and is equal to the opening 31 of the partition wall 30 or is formed in a cylindrical shape within a range that can be fitted into the opening 31, and is fitted into the opening 31. 31 is closed.

A first through hole 13 is formed in the center of the first main body 11. The first through hole 13 is a round hole having a diameter through which the cable 40 as a wire rod can be inserted. Further, the grommet 1 has a first slit 14 that passes from the first through hole 13 through the inner peripheral surface and the outer peripheral surface of the closing portion 12 and reaches the outer peripheral surface 11a of the first main body portion 11. As shown in FIG. 3A, the first slit 14 is formed in an arc shape in which the center line CL1 bends with a predetermined curvature (1 / R1) from the first through hole 13 to the outer peripheral surface 11a. .. The center line CL1 of the first slit 14 passes through the center C1 of the first through hole 13. The radius of curvature R1 of the center line CL1 of the first slit 14 may be formed larger than, for example, the radius of curvature of the first main body portion 11. When the cable 40 is inserted into the first through hole 13, the first slit 14 expands the first slit 14, and the outer peripheral surface 11a side of the first main body portion 11 passes through the expanded first slit 14. The cable 40 is inserted into the first through hole 13 and the cable 40 is inserted into the first through hole 13 by closing the widened first slit 14.

Further, as shown in FIGS. 1, 2 and 4 (A) and 4 (B), the second grommet portion 20 opens the opening 31 when the second grommet portion 20 having a diameter of 20 is pressed against the opening 31. It is provided with a second main body portion 21 formed in a disk shape that is so large that it cannot pass through and smaller than the first main body portion 11 of the first grommet portion 10, and is formed of a rubber material (for example, ethylene propylene rubber).

A second through hole 22 is formed in the center of the disk-shaped second main body 21. The second through hole 22 is a round hole having a diameter through which the cable 40 as a wire rod can be inserted. Further, the second main body portion 21 passes through the annular groove 23 for fitting the closed portion 12 of the first grommet portion 10 from the second through hole 22 to reach the outer peripheral surface 21a of the second main body portion 21. The slit 24 is formed. As shown in FIG. 4A, the second slit 24 has a curvature (1 / R1) of the center line CL1 of the first slit 14 from the second through hole 22 to the outer peripheral surface 21a. It is formed in an arc shape that bends with a different curvature (1 / R2). The center line CL2 of the second slit 24 passes through the center C2 of the second through hole 22. Here, the radius of curvature R2 of the center line CL2 of the second slit 24 is set to be larger than the radius of curvature R1 of the center line CL1 of the first slit 14. Alternatively, as described above, since the curvature of the center line CL1 of the first slit 14 and the curvature of the center line CL2 of the second slit 24 need to be different, the radius of curvature R1 and the radius of curvature R2 are the same values, and the positive and negative of the curvature are different. You may just be there. When the cable 40 is inserted into the second through hole 22, the second slit 24 expands the second slit 24, and the outer peripheral surface 21a side of the second main body portion 21 passes through the expanded second slit 24. The cable 40 is inserted into the second through hole 22 and the cable 40 is inserted into the second through hole 22 by closing the widened second slit 24.

Here, the first slit 14 formed in the first grommet portion 10 and the second slit 24 formed in the second grommet portion 20 are connected to the first grommet portion 10 and the second grommet portion 20. It is arranged at a position where it overlaps only at one point A (see FIG. 2A) when viewed from the insertion direction of the cable 40.

Then, in order to connect and fix the first grommet portion 10 and the second grommet portion 20 with the partition wall 30 sandwiched, the second main body portion 21 of the second grommet portion 20 has FIGS. 1 and 2 (A). , (B) and FIGS. 4 (A) and 4 (B), an annular groove 23 into which the tip of the closed portion 12 of the first grommet portion 10 is fitted is formed. The annular groove 23 is formed in an annular shape, has the same central axis as the second main body portion 21, and is formed so as to be recessed from the surface of the second main body portion 21. The tip of the closed portion 12 of the first grommet portion 10 fits into the annular groove 23 of the second grommet portion 20, and the frictional force between the closed portion 12 and the annular groove 23 causes the first grommet portion 10 to become the second grommet. It is prevented from coming off from the part 20. The closed portion 12 of the first grommet portion 10 is formed in a cylindrical shape protruding from the surface of the first main body portion 11.

Next, with reference to FIGS. 5 and 1, a method of supporting the cable 40 inserted into the opening 31 of the partition wall 30 by the grommet 1 described above on the partition wall 30 will be described.
First, as shown in FIG. 5, a cable 40 having the first connector 42 and the second connector 43 connected to both ends is inserted into the opening 31 of the partition wall.
Next, on the outer side, which is one side of the partition wall 30, the first slit 14 is widened with the closed portion 12 of the first grommet portion 10 on the opening 31 side (partition wall 30 side), and the widened first slit 14 is opened. By inserting the cable 40 into the first through hole 13 from the outer peripheral surface side of the first main body portion 11 through the slit 14, the cable 40 is inserted into the first through hole 13.

Next, on the inner side of the partition wall 30, the second slit 24 is widened to open the second through hole 22 with the annular groove 23 on the partition wall 30 side, and the widened second slit 24 is opened. By inserting the cable 40 into the second through hole 22 from the outer peripheral surface side of the second main body 21 via the cable 40, the cable 40 is inserted into the second through hole 22.
After that, each of the first grommet portion 10 and the second grommet portion 20 is moved toward the partition wall 30, that is, in the direction indicated by the arrow in FIG. 5, and the closing portion 12 of the first grommet portion 10 is opened to the partition wall 30. The fitting opening 31 is closed in the portion 31, and the tip of the closing portion 12 is fitted in the annular groove 23 of the second grommet portion 20.

As a result, as shown in FIG. 1, the cable 40 to which the first grommet portion 10 and the second grommet portion 20 are connected and inserted into the opening 31 of the partition wall 30 by the grommet 1 can be supported by the partition wall 30.
When the cable 40 is supported by the grommet 1 on the partition wall 30, the opening 31 is closed by the closing portion 12, and the first main body portion 11 of the first grommet portion 10 closes the opening 31 on one side of the opening portion 31 of the partition wall 30. A certain outer side is covered, and the inner side, which is the other side of the opening 31 of the partition wall 30, is covered by the second main body portion 21 of the second grommet portion 20. As a result, the waterproof function and the dustproof function from the outer side to the inner side of the partition wall 30 can be exhibited.

Further, in a state where the closed portion 12 of the first grommet portion 10 is fitted into the annular groove 23 of the second grommet portion 20, the first slit 14 and the second grommet portion 20 formed in the first grommet portion 10 are formed. The second slit 24 may be at a position where it does not overlap with each other when viewed from the insertion direction of the cable 40, or may be at a position where it overlaps with each other. Here, the second slit 24 has a curvature (1 / R2) different from the curvature (1 / R1) of the center line CL1 of the first slit 14 from the second through hole 22 to the outer peripheral surface 21a of the center line CL2. Since it is formed in an arc shape that bends at, when the first slit 14 and the second slit 24 overlap, they always overlap at only one point.

When the first slit 14 and the second slit 24 overlap at a large number of points or linearly, water droplets or the like that have passed through the gap of the first slit 14 pass through the second slit 24 or pass through the gap of the second slit 24. The water droplets and the like pass through the first slit 14, and the water droplets and the like pass through the glomet 1 and the prevention function and the dustproof function are not sufficiently exhibited.
Here, as described above, the first slit 14 formed in the first grommet portion 10 and the second slit 24 formed in the second grommet portion 20 are positioned so as not to overlap each other when viewed from the insertion direction of the cable 40. In some cases, water droplets and the like do not pass through the grommet 1, and the waterproof function and dustproof function of the grommet 1 can be sufficiently exhibited.

Further, when the first slit 14 and the second slit 24 are in an overlapping position, in the grommet 1 according to the first embodiment, as described above, both are always arranged at a position where they overlap at only one point. In FIG. 2A, the first slit 14 and the second slit 24 are arranged at positions where they overlap only at one point A, and even if the first grommet portion 10 and the second grommet portion 20 rotate, they overlap each other. Only the position of one point is different. Therefore, most of the water droplets and the like that have passed through the gap of the first slit 14 of the first grommet portion 10 are blocked by the second grommet portion 20, or have passed through the gap of the second slit 24 of the second grommet portion 20. Since most of the water droplets and the like are blocked by the first grommet portion 10, most of the water droplets and the like cannot pass through the grommet 1. As a result, the waterproof function and the dustproof function of the grommet 1 can be fully exhibited.

Further, since the first grommet portion 10 and the second grommet portion 20 each have a first slit 14 or a second slit 24, a through hole of the grommet is inserted into the end portion of the wire rod, and then the grommet is inserted at a predetermined location. It is not necessary to perform work such as moving to, and workability is improved.

(Second Embodiment)
Next, the grommet according to the second embodiment of the present invention will be described with reference to FIGS. 6 (A) and 6 (B) to 8 (A) and 8 (B). 6 (A), (B) to 8 (A), (B), the same members as those shown in FIGS. 2 (A), (B) to 4 (A), (B) are the same. Is added and the description thereof may be omitted.
The grommet 1 shown in FIGS. 6 (A) and 6 (B) has the same basic configuration as the grommet 1 shown in FIGS. 2 (A) and 2 (B), but has the same shape and arrangement as the first slit 15 and the second slit 25. The method is different from the shape and arrangement of the first slit 14 and the second slit 24 of the grommet 1 shown in FIGS. 2A and 2B.

That is, as shown in FIG. 7A, the first slit 15 passes through the inner peripheral surface and the outer peripheral surface of the closing portion 12 from the first through hole 13 and passes through the inner peripheral surface and the outer peripheral surface of the closing portion 12, and the first main body portion, as shown in FIG. 7A. It reaches the outer peripheral surface 11a of 11, but differs from the first slit 14 in that its center line CL3 is formed in a straight line that does not pass through the center C1 of the first through hole 13. Similar to the first slit 14, the first slit 15 expands the first slit 15 when the cable 40 is inserted into the first through hole 13, and the first slit 15 is passed through the expanded first slit 15. The cable 40 is inserted into the first through hole 13 from the outer peripheral surface 11a side of the main body 11, and the cable 40 is inserted into the first through hole 13 by closing the widened first slit 15.

Further, as shown in FIG. 8A, the second slit 25 passes through the annular groove 23 from the second through hole 22 and reaches the outer peripheral surface 21a of the second main body portion 21 as in the second slit 24. However, it differs from the second slit 24 in that the center line CL4 is formed in a straight line that does not pass through the center C2 of the second through hole 22. Similar to the second slit 24, the second slit 25 expands the second slit 25 when the cable 40 is inserted into the second through hole 22, and the second slit 25 is passed through the expanded second slit 25. The cable 40 is inserted into the second through hole 22 from the outer peripheral surface 21a side of the main body 21, and the cable 40 is inserted into the second through hole 22 by closing the widened second slit 25.

Here, the first slit 15 formed in the first grommet portion 10 and the second slit 25 formed in the second grommet portion 20 are connected to the first grommet portion 10 and the second grommet portion 20. It is arranged at a position where it overlaps only at one point B (see FIG. 6A) when viewed from the insertion direction of the cable 40. In order to arrange in this way, the second slit 25 becomes the first slit 15 even when the closed portion 12 of the first grommet portion 10 is fitted into the annular groove 23 of the second grommet portion 20 at any rotation angle. Each slit needs to be formed so that they do not overlap over the entire length. Specifically, the distance between the center C1 of the first through hole 13 and the other end of the outer peripheral end of the first slit 15 and the other end of the center C2 of the second through hole 22 and the outer peripheral end of the second slit 25. Each slit is formed so that the distance is the same and the angle formed by the center C1 and the first slit 15 is not the same as the angle formed by the center C2 and the second slit 25.

When the first slit 15 formed in the first grommet portion 10 and the second slit 25 formed in the second grommet portion 20 are located at positions where they do not overlap each other when viewed from the insertion direction of the cable 40, water droplets or the like are generated. It does not pass through the grommet 1 and can fully exhibit the waterproof function and the dustproof function of the grommet 1.

Further, when the first slit 15 and the second slit 25 are in an overlapping position, in the grommet 1 according to the second embodiment, as described above, both are always arranged at a position where they overlap at only one point. In FIG. 6A, the first slit 15 and the second slit 25 are arranged at positions where they overlap only at one point B, and even if the first grommet portion 10 and the second grommet portion 20 rotate, they overlap each other. Only the position of one point is different. Therefore, most of the water droplets and the like that have passed through the gap of the first slit 15 of the first grommet portion 10 are blocked by the second grommet portion 20, or have passed through the gap of the second slit 25 of the second grommet portion 20. Since most of the water droplets and the like are blocked by the first grommet portion 10, most of the water droplets and the like cannot pass through the grommet 1. As a result, the waterproof function and the dustproof function of the grommet 1 can be fully exhibited.

Further, since the first grommet portion 10 and the second grommet portion 20 each have a first slit 15 or a second slit 25, a through hole of the grommet is inserted into the end portion of the wire rod, and then the grommet is inserted at a predetermined location. It is not necessary to perform work such as moving to, and workability is improved.
Although the embodiments of the present invention have been described above, the present invention is not limited to this, and various modifications and improvements can be made.

For example, the cable 40 as a wire rod is connected to the vehicle-mounted camera side by the first connector 42 on one end side and connected to the car navigation side by the second connector 43 on the other end side, but is connected by the wire rod. The target is not limited to in-vehicle cameras and car navigation systems, and any other electrical component can be applied.

In the present invention, with the first grommet portion 10 and the second grommet portion 20 connected, the first slit 14 (first slit 15 in the second embodiment) and the second slit 24 (second in the second embodiment). The slits 25) need only overlap at one point when viewed from the insertion direction of the cable 40 as a wire rod, and as in the first embodiment, the second slit 24 has the center line CL2 of the second grommet portion 20. 2 It is not always necessary to form an arc shape that bends from the through hole 22 to the outer peripheral surface 21a with a curvature (1 / R2) different from the curvature (1 / R1) of the center line CL1 of the first slit 14. , As in the second embodiment, the first slit 15 is formed in a straight line whose center line CL3 does not pass through the center C1 of the first through hole 13, and the second slit 25 has its center line CL4 second. It does not necessarily have to be formed in a straight line that does not pass through the center C2 of the through hole 22.

1 Grommet 10 1st grommet part 11 1st main body part 11a outer peripheral surface 12 closed part 13 1st through hole 14, 15 1st slit 20 2nd grommet part 21 2nd main body part 21a outer peripheral surface 22 2nd through hole 23 annular groove 24, 25 2nd slit 30 partition wall 31 opening 40 cable (linear member)
41 Electric wire 42 1st connector 43 2nd connector C1 Center of 1st through hole C2 Center of 2nd through hole CL1, CL3 Center line of 1st slit CL2, CL4 Center line of 2nd slit R1 Center line of 1st slit Radius of curvature R2 Radius of curvature of the center line of the second slit

Claims (3)

It is a grommet through which the wire is inserted,
The grommet comprises a first grommet portion and a second grommet portion superposed on the first grommet portion.
The first grommet portion has a first through hole through which the wire rod is inserted and a first slit formed so as to reach the outer peripheral surface from the first through hole.
The second grommet portion has a second through hole through which the wire rod is inserted and a second slit formed so as to reach the outer peripheral surface from the second through hole.
A grommet characterized in that, in a state where the first grommet portion and the second grommet portion are connected, the first slit and the second slit overlap at least one point when viewed from the insertion direction of the wire rod. The first slit is formed in an arc shape whose center line bends with a predetermined curvature from the first through hole of the first grommet portion to the outer peripheral surface, and the center line of the second slit is the said. The first aspect of claim 1, wherein the second grommet portion is formed in an arc shape that bends from the second through hole to the outer peripheral surface with a curvature different from the curvature of the center line of the first slit. Grommet. The first slit and the second slit are formed in a state where the first slit is formed in a straight line, the second slit is formed in a straight line, and the first grommet portion and the second grommet portion are connected to each other. The grommet according to claim 1, wherein the grommet is formed so as not to overlap over the entire length of the first slit or the second slit.

Images