JP5780095B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet formed into one cylindrical shape by connecting two cylindrical members each made of an elastic material.

  The grommet is made of a cylindrical elastic body through which a wire harness is passed, and is attached to a portion in which a through hole is formed in a support body such as an automobile body. The grommet protects the wire harness that is passed through the through hole of the support body, closes a gap between the through hole of the support body and the wire harness, and performs a water stop function and a dustproof function.

  Generally, the grommet has a cylindrical panel mounting portion that is attached to the edge of the through hole of the plate-like support. The panel mounting portion is a portion in which an annular groove into which an edge portion of the through hole in the support body is fitted is formed.

  By the way, it is difficult to mold a long cylindrical member made of an elastic material in terms of quality and cost. Therefore, for example, when two panel mounting portions and a long intermediate tube portion connecting the two panel mounting portions are required, a connection type grommet is employed.

  As shown in Patent Document 1 and Patent Document 2, the connection type grommet is a grommet formed into one cylindrical shape by connecting two cylindrical members each made of an elastic material.

  For example, Patent Document 1 discloses a connection type grommet that is formed into one cylindrical shape by connecting two cylindrical elastic members each made of an elastic material by a cylindrical hard member for relay. ing. The cylindrical hard member for relay is a hard resin molded member.

  In the grommet shown in Patent Document 1, each of the two cylindrical elastic members is placed on both ends of one cylindrical hard member and fixed by tightening with a fastening belt or the like. That is, in the connection type grommet shown in Patent Document 1, the water stop structure at the connecting portion of the two cylindrical elastic members is a water stop structure by surface contact between the elastic member and the hard member.

  In Patent Document 2, one end portion of two cylindrical elastic members is directly covered with the other end portion and fixed with an adhesive tape to form a single cylindrical shape. Shown for grommets. That is, in the connection type grommet shown in Patent Document 2, the water stop structure at the connecting portion of the two cylindrical elastic members is a water stop structure by surface contact between the two elastic members.

  In a connection type grommet, it is effective to fasten a fastening belt to the connection part in order to firmly fix each of the two cylindrical elastic members to the connection partner member and ensure sufficient water stop performance. is there.

Japanese Patent Laid-Open No. 11-332063 Japanese Utility Model Publication No. 6-58529

  However, in the connecting grommet shown in Patent Document 1, in order to firmly fix the two cylindrical elastic members to the cylindrical hard member, it is necessary to tighten the fastening belt in at least two places. It becomes. In recent years, in order to reduce the manufacturing cost and man-hours of grommet, it is required to reduce the required number of fastening belts.

  Moreover, as the water stop structure in the connection part of two cylindrical elastic members, the water stop structure by the surface contact of two elastic members is more than the water stop structure by the surface contact of an elastic member and a hard member. desirable. This is because the portion where the two elastic members are in surface contact with each other has higher adhesiveness than the portion where the elastic member and the hard member are in surface contact, and is more excellent in water stopping performance.

  On the other hand, in the connection type grommet shown in Patent Document 2, a cylindrical hard member is not used. Therefore, when the fastening belt is strongly tightened to the portion where the ends of the two cylindrical elastic members overlap each other, the cylindrical elastic member is crushed and a gap is generated between the two cylindrical elastic members. End up.

  The present invention provides an excellent water-stopping performance and a necessary number of fastening belts in the connecting portion of the grommet formed into one cylindrical shape by connecting two cylindrical members each made of an elastic material. It aims at being able to reduce.

The grommet according to the first invention is formed of a cylindrical first soft cylinder member and a second soft cylinder member each made of an elastic material, and a material harder than the elastic material, and the first soft cylinder member and the second soft cylinder member A cylindrical hard cylindrical member inserted inside the end of each cylindrical member. Furthermore, the grommet which concerns on 1st invention is equipped with each component shown below.
(1) A 1st component is a part which occupies a part range from one end of said 1st soft cylinder member, and an inner peripheral surface is a part from one end of the axial direction in said hard cylinder member It is the cylindrical 1st connection part which covers the said hard cylinder member in the state closely_contact | adhered to the outer peripheral surface of the 1st area | region which occupies the range.
(2) The second component is a portion that occupies a part of the range from one end of the second soft cylindrical member, and the inner peripheral surface is in close contact with the outer peripheral surface of the first connecting portion, It is the cylindrical 2nd connection part covered on a 1st connection part.
(3) A 3rd component is a part which continues to said 2nd connection part in said 2nd soft cylinder member, and an inner peripheral surface is an outer periphery of the remaining 2nd field other than said 1st field in said hard cylinder member It is the cylindrical 3rd connection part covered on the said hard cylinder member in the state closely_contact | adhered to a surface. In addition, on the outer peripheral surface of the portion on the back side of the first connecting portion in the first soft cylindrical member, a collar portion that protrudes along the circumferential direction and is partially formed with a chipped portion is formed, A protruding portion that extends along the axial direction of the second soft cylindrical member and fits into the chipped portion of the flange portion is formed in a part of the second connecting portion.

The grommet according to the second invention is an example of the grommet according to the first invention. In the grommet according to the second aspect of the present invention, the first connection which is an annular step which forms the boundary between the first region and the second region and contacts the tip of the first connection portion on the outer peripheral surface of the hard cylindrical member. A part-side step is formed.

The grommet according to the third invention is an example of the grommet according to the first invention or the second invention. In the grommet according to the third aspect of the invention , a first inner step which is an annular step is formed on the inner surface of the third connecting portion in the second soft cylindrical member, and the second region in the hard cylindrical member A second connecting portion side step which is an annular step in contact with the first inner step is formed on the outer peripheral surface.

Grommet according to a fourth aspect of the invention is an example of a grommet according to any one of the first through third aspects of the present invention. In the grommet concerning the 4th invention, while the end of the 1st field side in the hard cylinder member touches the inner surface of the 1st soft cylinder member, the inner side of the hard cylinder member and the 1st soft cylinder member A second inner step which is an annular step which is flush with the inner surface of the portion on the back side of the first connecting portion is formed, and the hard tube member is formed on the inner surface of the second soft tube member In the annular step where the end of the second region side in contact with the inner side surface of the hard cylindrical member and the inner side surface of the second connecting portion of the second soft cylindrical member are flush with each other A third inner step is formed.

A grommet according to a fifth invention is formed of a cylindrical first soft cylindrical member and a second soft cylindrical member each made of an elastic material, and a material harder than the elastic material, and the first soft cylindrical member and the second soft cylindrical member. A cylindrical hard cylindrical member inserted inside the end of each cylindrical member, the grommet occupying a part of the range from one end of the first soft cylindrical member, A cylindrical first connecting portion that covers the hard cylindrical member in a state in which the peripheral surface is in close contact with the outer peripheral surface of the first region occupying a part of the range from one end in the axial direction of the hard cylindrical member; It is a portion that occupies a part of the range from one end of the second soft cylindrical member, and is a cylindrical shape that covers the first connecting portion in a state where the inner peripheral surface is in close contact with the outer peripheral surface of the first connecting portion. The second connecting portion and the portion connected to the second connecting portion in the second soft cylindrical member And a cylindrical third connecting portion that covers the hard cylindrical member in a state in which the inner peripheral surface is in close contact with the outer peripheral surface of the remaining second region other than the first region in the hard cylindrical member, A first connecting portion side step is formed on the outer peripheral surface of the hard cylindrical member, which is an annular step that forms the boundary between the first region and the second region and contacts the tip of the first connecting portion.

The grommet according to the sixth invention is an example of the grommet according to the fifth invention . In the grommet according to the sixth aspect of the invention , a first inner step which is an annular step is formed on the inner surface of the third connecting portion in the second soft cylindrical member, and the second region in the hard cylindrical member A second connecting portion side step which is an annular step in contact with the first inner step is formed on the outer peripheral surface.
The grommet according to the seventh invention is an example of the grommet according to the fifth invention or the sixth invention. In the grommet according to the seventh aspect of the invention, an end of the hard tube member on the first region side is in contact with an inner surface of the first soft tube member, and an inner surface of the hard tube member and the first soft tube member A second inner step which is an annular step which is flush with the inner surface of the portion on the back side of the first connecting portion is formed, and the hard tube member is formed on the inner surface of the second soft tube member In the annular step where the end of the second region side in contact with the inner side surface of the hard cylindrical member and the inner side surface of the second connecting portion of the second soft cylindrical member are flush with each other A third inner step is formed.
A grommet according to an eighth invention is formed of a cylindrical first soft cylindrical member and a second soft cylindrical member each made of an elastic material, and a material harder than the elastic material, and the first soft cylindrical member and the second soft cylindrical member. A cylindrical hard cylindrical member inserted inside the end of each cylindrical member, the grommet occupying a part of the range from one end of the first soft cylindrical member, A cylindrical first connecting portion that covers the hard cylindrical member in a state in which the peripheral surface is in close contact with the outer peripheral surface of the first region occupying a part of the range from one end in the axial direction of the hard cylindrical member; It is a portion that occupies a part of the range from one end of the second soft cylindrical member, and is a cylindrical shape that covers the first connecting portion in a state where the inner peripheral surface is in close contact with the outer peripheral surface of the first connecting portion. The second connecting portion and the portion connected to the second connecting portion in the second soft cylindrical member And a cylindrical third connecting portion that covers the hard cylindrical member in a state in which the inner peripheral surface is in close contact with the outer peripheral surface of the remaining second region other than the first region in the hard cylindrical member, A first inner step which is an annular step is formed on the inner side surface of the third connecting portion in the second soft cylindrical member, and the first inner step is formed on the outer peripheral surface of the second region in the hard cylindrical member. A second connecting portion side step is formed which is an annular step in contact with.
The grommet according to the ninth invention is an example of the grommet according to the eighth invention. In the grommet according to the ninth aspect of the present invention, the end of the hard tube member on the first region side is in contact with the inner surface of the first soft tube member, and the inner surface of the hard tube member and the first soft tube member A second inner step which is an annular step which is flush with the inner surface of the portion on the back side of the first connecting portion is formed, and the hard tube member is formed on the inner surface of the second soft tube member In the annular step where the end of the second region side in contact with the inner side surface of the hard cylindrical member and the inner side surface of the second connecting portion of the second soft cylindrical member are flush with each other A third inner step is formed.
A grommet according to a tenth invention is formed of a cylindrical first soft cylindrical member and a second soft cylindrical member each made of an elastic material, and a material harder than the elastic material, and the first soft cylindrical member and the second soft cylindrical member. A cylindrical hard cylindrical member inserted inside the end of each cylindrical member, the grommet occupying a part of the range from one end of the first soft cylindrical member, A cylindrical first connecting portion that covers the hard cylindrical member in a state in which the peripheral surface is in close contact with the outer peripheral surface of the first region occupying a part of the range from one end in the axial direction of the hard cylindrical member; It is a portion that occupies a part of the range from one end of the second soft cylindrical member, and is a cylindrical shape that covers the first connecting portion in a state where the inner peripheral surface is in close contact with the outer peripheral surface of the first connecting portion. The second connecting portion and the portion connected to the second connecting portion in the second soft cylindrical member A cylindrical third connecting portion that covers the hard cylindrical member in a state in which the inner peripheral surface is in close contact with the outer peripheral surface of the remaining second region other than the first region in the hard cylindrical member, The end of the hard tube member on the first region side is in contact with the inner surface of the first soft tube member, and the inner surface of the hard tube member and the back side of the first connection portion of the first soft tube member A second inner step which is an annular step which is flush with the inner surface of the portion is formed, and an end of the hard tube member on the second region side is formed on the inner surface of the second soft tube member. A third inner step which is an annular step that is in contact with and is flush with the inner surface of the hard cylindrical member and the inner surface of the second soft cylindrical member on the inner side of the third connecting portion. Yes.
The grommet according to the eleventh invention is an example of the grommet according to any one of the first invention to the tenth invention. In the grommet according to the eleventh aspect of the present invention, a belt step is formed on the outer peripheral surface of the second connecting portion, which is a pair of steps forming a recess into which a belt for fastening the second connecting portion is fitted.

The grommets according to the inventions are connected grommets formed into a single cylindrical shape by connecting a first soft cylindrical member and a second soft cylindrical member made of an elastic material, respectively. The grommet concerning each invention WHEREIN: The 2nd connection part of a 2nd soft cylinder member is covered with the 1st connection part of a 1st soft cylinder member. That is, the grommet according to each invention has a water stop structure by surface contact between two elastic members. Therefore, according to each invention, the outstanding water stop performance is acquired by fastening the fastening belt to the 2nd connection part which overlapped the outer side of the 1st connection part.

Furthermore, according to each invention, since sufficient waterproof performance is obtained only by attaching a fastening belt to one place, the required number of fastening belts can be reduced.

Moreover, in the grommet concerning each invention, a part of hard cylinder member is inserted in the further inner side of the 1st connection part which overlapped with the inner side of the 2nd connection part. Therefore, even when the fastening belt is strongly tightened with respect to the second connecting portion that overlaps the outside of the first connecting portion, the first connecting portion and the second connecting portion made of an elastic material are deformed and the gap between them is reduced. The inconvenience of generating a gap is avoided.

Further, in the grommet according to each invention, the second region portion of the hard cylindrical member facilitates the work of covering the first connecting portion of the first soft cylindrical member with the second connecting portion of the second soft cylindrical member, There exists an effect which prevents that a clearance gap is made between a connection part and a 2nd connection part.

  That is, the frictional resistance between the first connecting portion and the second connecting portion each made of an elastic material is large. For this reason, if the second connecting portion is slid on the outer peripheral surface of the first connecting portion and then covers the first connecting portion, the second connecting portion is deformed and a gap is formed between the first connecting portion and the second connecting portion. Is likely to occur. However, by inserting the second region of the hard cylindrical member inside the third connecting part, the second connecting part is turned from the third connecting part side to the front end after the second connecting part is folded back to the third connecting part side. It becomes easy to cover the first connecting portion in order to the side. When the second connecting portion is placed on the first connecting portion in this manner, the second connecting portion is put on the first connecting portion without being rubbed with the first connecting portion.

According to the eleventh aspect of the invention, the belt level difference indicates the correct mounting position of the fastening belt and prevents the fastening belt from being displaced in the axial direction of the grommet. Therefore, it is prevented that the performance of water stoppage due to surface contact between the first connecting portion and the second connecting portion is deteriorated due to incomplete mounting position of the fastening belt or displacement of the fastening belt.

  By the way, when a strong torsional force is applied to the first soft cylinder member or the second soft cylinder member and the force acts on the contact surfaces of the first connection part and the second connection part, the first connection part and the second connection part There is a risk of misalignment (rotation) in the circumferential direction of the part. When such a positional shift occurs, the contact surfaces of the first connecting part and the second connecting part may be deformed, and the water stop performance may be deteriorated.

In the grommets according to the first to fourth inventions , the fitting structure of the overhanging portion of the second soft cylindrical member and the chipped portion in the flange portion of the first soft cylindrical member is the first soft cylindrical member and the second soft cylindrical member. It functions as a rotation stopper that prevents displacement in the circumferential direction. Therefore, according to the 3rd invention, the fall of the water stop performance resulting from the position shift in the circumferential direction of the 1st soft cylinder member and the 2nd soft cylinder member is avoided. In particular, when the cross section of the inner peripheral surface of each of the second connecting part and the third connecting part is circular, the effect of the fitting structure becomes more remarkable.

Further , according to the second and fifth to seventh inventions, the first connecting portion side step has a variation in the length of the first connecting portion in the first soft cylindrical member, that is, the length of the portion covered by the hard cylindrical member. To prevent. The variation in the length of the first connecting portion causes the variation in the water stop performance in the connecting portion of the connecting grommet. Therefore, according to the second and fifth to seventh inventions, variation (decrease) in the water stopping performance due to variation in the length of the first connecting portion is avoided.

Further, according to the 3, 6, 8 invention, the second connecting portion side step is, the length of the second connecting portion of the second flexible tubular member, i.e., it varies the length of the portion for covering the first connecting portion To prevent that. The variation in the length of the second connecting portion causes a variation in the water stop performance in the connecting portion of the connecting grommet. Therefore, according to the 3, 6, 8 invention, variations in the water stopping performance due to variations in the length of the second connecting portion (reduced) is avoided.

Also according to the fourth, seventh , ninth, and tenth inventions, the second inner step and the third inner step are the length of the first connecting portion in the first soft tubular member, and the second connecting portion in the second soft tubular member. Prevents variation in the length. Therefore, according to the fourth , seventh, ninth , and tenth inventions, variation (decrease) in the water stop performance due to variations in the lengths of the first connection portion and the second connection portion is avoided.

Further, according to the fourth , seventh, ninth , and tenth inventions, the inner surface of the hard cylinder member and the inner surfaces of the first soft cylinder member and the second soft cylinder member are flush with each other. Thereby, since the protrusion which becomes the obstruction of insertion of a wire harness does not exist in the inner surface of a grommet, the operation | work which lets a wire harness pass to a grommet becomes easy.

It is the top view and side view of three components which comprise the grommet 1 which concerns on embodiment of this invention. FIG. 3 is a first cross-sectional view of a portion to be connected in three parts constituting the grommet 1. FIG. 3 is a first cross-sectional view of a portion where three parts constituting the grommet 1 are connected. FIG. 3 is a second cross-sectional view of a portion where three parts constituting the grommet 1 are connected. FIG. 3 is a second cross-sectional view of a portion where three parts constituting the grommet 1 are connected. It is sectional drawing of the connection part of the state in the middle of the connection in three components which comprise the grommet 1. FIG. 2 is a perspective view of a connecting portion of two soft cylindrical members constituting the grommet 1. FIG. 3 is a perspective view of a portion where three parts constituting the grommet 1 are connected. FIG. It is a perspective view of the connection part of the grommet 1, and the fastening belt with which it was mounted | worn. It is a perspective view of the connection part of the grommet 1, and the clamp with a belt with which it was mounted | worn.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention.

<Part configuration>
First, the component configuration of the grommet 1 according to the embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the grommet 1 includes three parts: a first soft cylinder member 10, a second soft cylinder member 20, and a hard cylinder member 30.

  The first soft cylinder member 10 and the second soft cylinder member 20 are cylindrical members each made of an elastic material. The first soft cylinder member 10 and the second soft cylinder member 20 are members made of, for example, rubber or an elastomer (elastic polymer) that is a rubber-based material. The elastomer includes vulcanized rubbers such as natural rubber and synthetic rubber, and thermosetting resin-based elastomers such as urethane rubber, silicone rubber and fluorine rubber.

  The first soft cylinder member 10 includes a first connection part 11, a first intermediate cylinder part 12, and a first panel mounting part 19. The first connection part 11 is a part formed for connection with the second soft cylinder member 20. The detailed structure will be described later. The 1st panel mounting part 19 is a cylindrical part attached to the edge of the through-hole of a plate-shaped support body. Further, the first intermediate cylinder part 12 is a cylindrical part that connects the first connecting part 11 and the first panel mounting part 19. In this embodiment, the 1st intermediate | middle cylinder part 12 has a bellows structure in the part.

  The second soft cylinder member 20 includes a second connection part 21, a third connection part 22, a second intermediate cylinder part 23, and a second panel mounting part 29. The second connecting portion 21 and the third connecting portion 22 are portions formed for connection with the first soft cylindrical member 10. The detailed structure will be described later. The 2nd panel mounting part 29 is a cylindrical part attached to the edge of the through-hole of a plate-shaped support body. The second intermediate cylinder part 23 is a cylindrical part that connects the third connecting part 22 and the second panel mounting part 29. In the present embodiment, the second intermediate cylinder portion 23 has a bellows structure in a part thereof.

  On the other hand, the hard cylinder member 30 is a cylindrical member made of a material harder than the elastic material constituting the first soft cylinder member 10 and the second soft cylinder member 20. The hard cylinder member 30 is a member made of a thermoplastic resin such as polypropylene (PP) or polyamide (PA). In this embodiment, the hard cylinder member 30 is a resin member that is integrally molded as a whole.

<Composition of connecting part>
Then, the structure of the connection part of the 1st soft cylinder member 10 in the grommet 1 and the 2nd soft cylinder member 20 is demonstrated, referring FIGS. 2-8.

  FIG. 2 is a cross-sectional view of the connecting portion of the three parts constituting the grommet 1, and is a cross-sectional view taken along the line AA shown in FIG. FIG. 3 is a cross-sectional view of a connecting portion in which three components are connected, and is a cross-sectional view corresponding to the AA cross-section shown in FIG. FIG. 4 is a cross-sectional view of the connecting portion of the three parts constituting the grommet 1, and is a cross-sectional view taken along the line BB shown in FIG. FIG. 5 is a cross-sectional view of a connecting portion in which three components are connected, and is a cross-sectional view corresponding to the BB cross section shown in FIG.

  As shown in FIGS. 1, 2, 4, and 7, the first connecting portion 11 of the first soft tubular member 10 is a portion that occupies a part of the range from one end of the first soft tubular member 10. is there. As shown in FIGS. 3 and 5, the first connecting portion 11 has an inner peripheral surface on the outer peripheral surface of the first region 31 that occupies a part of the range from one end in the axial direction of the hard cylindrical member 30. It is a cylindrical part that covers the first region 31 of the hard cylindrical member 30 in a close contact state.

  In the following description, the remaining region other than the first region 31 in the hard cylindrical member 30, that is, the region other than the region covered with the first connecting portion 11 is referred to as a second region 32.

  As shown in FIG. 4, a boundary annular flange 33, which is an annular protrusion, is formed on the outer peripheral surface of the boundary portion with the first region 31 in the second region 32 of the hard cylindrical member 30. That is, the boundary annular flange 33 is included in the second region 32, and the side surface of the boundary annular flange 33 on the first region 31 side forms an annular step that forms the boundary between the first region 31 and the second region 32. doing. Hereinafter, this step is referred to as a first connecting portion side step 331.

  As shown in FIGS. 3 and 5, the first connecting portion side step 331 forms a boundary between the first region 31 and the second region 32, and the first connecting portion 11 is in a state where three parts are connected. It is the level | step difference which the front-end | tip touches.

  On the other hand, as shown in FIGS. 1, 2, 4, and 7, the second connecting portion 21 of the second soft cylindrical member 20 occupies a part of the range from one end of the second soft cylindrical member 20. Part. As shown in FIGS. 3 and 5, the second connecting portion 21 is a cylindrical portion that covers the first connecting portion 11 with the inner peripheral surface being in close contact with the outer peripheral surface of the first connecting portion 11. is there.

  Moreover, as FIG.1, FIG.2, FIG.4 and FIG. 7 show, the 3rd connection part 22 of the 2nd soft cylinder member 20 is a part which continues to the 2nd connection part 21 in the 2nd soft cylinder member 20. . As shown in FIGS. 3 and 5, the third connecting portion 22 is hard in a state where the inner peripheral surface is in close contact with the outer peripheral surface of the remaining second region 32 other than the first region 31 in the hard cylindrical member 30. It is a cylindrical portion that covers the second region 32 of the cylindrical member 30.

  In addition, the outer peripheral surface of the first intermediate cylindrical portion 12 of the first soft cylindrical member 10 that is close to the first connecting portion 11, that is, the outer peripheral surface of the portion on the back side of the first connecting portion 11, is arranged in the circumferential direction. A non-annular flange 13 is formed which protrudes along the surface and is partially formed with a chipped portion 132.

  One side 131 of the non-annular flange 13 is a surface that is in contact with one end of the second soft cylindrical member 20, that is, the tip of the second connecting portion 21 in a state where the three components are connected.

  On the other hand, as shown in FIG. 7, a protruding portion 211 that protrudes along the axial center direction of the second soft cylindrical member 20 is formed on a part of the second connecting portion 21. As shown in FIG. 8, the overhanging portion 211 closely fits into the chipped portion 132 of the non-annular flange portion 13 of the first soft tubular member 10 in a state where the three components are connected.

  Moreover, the 1st cyclic | annular collar part 24 which is the part protruded cyclically | annularly along the circumferential direction is formed in the outer peripheral surface of the 2nd connection part 21. As shown in FIG. Similarly, in a region extending between the second connecting portion 21 and the third connecting portion 22 on the outer peripheral surface of the second soft cylindrical member 20, a second annular flange 25, which is a portion protruding annularly along the circumferential direction, is provided. Is formed.

  Two mutually opposing side surfaces of the first annular flange portion 24 and the second annular flange portion 25 form a pair of steps forming a recess 26 into which the belt 91 for fastening the second connecting portion 21 is fitted. Hereinafter, the pair of steps is referred to as belt steps 241 and 251. The belt steps 241 and 251 are an example of a pair of steps forming a recess 26 into which the belt 91 is fitted on the outer peripheral surface of the second connecting portion 21.

  A first inner step 271 that is an annular step is formed on the inner surface 222 of the third connecting portion 22 in the second soft cylindrical member 20. And the side surface by the side of the 2nd area | region 32 of the boundary cyclic | annular collar part 33 of the hard cylinder member 30 is a level | step difference which contact | connects the 1st inner side level | step difference 271 in the state in which three components were connected. Hereinafter, this step is referred to as a second connecting portion side step 332. The second connecting portion side step 332 is an annular step formed on the outer peripheral surface of the second region 32 in the hard cylindrical member 30 and in contact with the first inner step 271.

  As shown in FIGS. 2 and 4, the inner surface of the first soft cylindrical member 10 is in contact with the end 310 on the first region 31 side of the hard cylindrical member 30 in a state where the three components are connected. A second inner step 14 which is an annular step is formed. The second inner step 14 is a portion (the first intermediate tube portion) on the inner side 302 of the hard tube member 30 and the first connecting portion 11 of the first soft tube member 10 in the state where the three parts are connected. 12) is a step which is flush with the inner side surface 122 of FIG.

  Further, as shown in FIGS. 2 and 4, the end 320 on the second region 32 side of the hard cylindrical member 30 is in contact with the inner surface of the second soft cylindrical member 20 in a state where the three parts are connected. A third inner step 272 that is an annular step is formed. This third inner level difference 272 is a portion (second intermediate cylinder part) on the inner side 302 of the hard cylinder member 30 and the third connection part 22 of the second soft cylinder member 20 in the state where the three parts are connected. 23) is an annular step that is flush with the inner side surface 232 of FIG.

  In the present embodiment, the inner surface and the outer surface of the first connecting portion 11, the inner surfaces of the second connecting portion 21 and the third connecting portion 22, the outer surface 311 and the second surface of the first region 31 in the hard cylindrical member 30. The outer surface 321 of the region 32 and the inner surface 302 of the hard cylindrical member 30 are both formed in a circular cross section.

<Consolidation procedure>
Hereinafter, an example of a procedure for connecting the three components constituting the grommet 1 will be described with reference to FIG. FIG. 6 is a cross-sectional view of the connecting part in the state of being connected in the three parts constituting the grommet 1.

  When three parts are connected, for example, a first step of covering the second connecting portion 22 of the second soft cylindrical member 20 over the second region 32 of the hard cylindrical member 30 is performed. It can be said that the first step is a step of inserting the second region 32 of the hard cylindrical member 30 inside the third connecting portion 22 of the second soft cylindrical member 20.

  In the first step, the hard cylinder member 30 is inserted to a position where the end 320 on the second region 32 side hits the third inner step 272 of the second soft cylinder member 20. Furthermore, in a 1st process, as FIG. 6 shows, the 2nd connection part 21 of the 2nd soft cylinder member 20 is return | folded by the 3rd connection part 22 side in which the hard cylinder member 30 was inserted inside.

  If the hard cylinder member 30 is not inserted inside the third connecting portion 22, the third connecting portion 22 is greatly deformed when the second connecting portion 21 is turned back. The work is difficult. Since the second region 32 of the hard cylindrical member 30 is inserted in advance inside the third connecting portion 22, the folding operation of the second connecting portion 21 is facilitated.

  Next, the 2nd process which covers the 1st connection part 11 of the 1st soft cylinder member 10 on the 1st area | region 31 of the hard cylinder member 30 is performed. It can be said that this second step is a step of inserting the first region 31 of the hard cylindrical member 30 into the first connecting portion 11 of the first soft cylindrical member 10.

  In the second step, the hard cylinder member 30 is inserted to a position where the end 310 on the first region 31 side hits the second inner step 14 of the first soft cylinder member 10. In addition, the order of a 1st process and a 2nd process is not ask | required. That is, the second step may be performed before the first step.

  After the first step and the second step are performed, the second connecting portion 21 is moved to the third connecting portion 22 side (back) while returning the second connecting portion 21 of the folded second soft cylindrical member 20 to the original state. The third step of covering the first connecting portion 11 of the first soft cylindrical member 10 in order from the side) to the tip side is performed.

  If the 2nd connection part 21 is covered on the 1st connection part 11 in the procedure shown above, it will cover on the 1st connection part 11 without a gap without rubbing with the 1st connection part 11. FIG.

<Fastening belt>
Next, the grommet 1 in which the belt 91 is fastened to the connecting portion will be described with reference to FIGS. 9 and 10. FIG. 9 is a perspective view of the connecting portion of the grommet 1 and the fastening belt 9 attached thereto. FIG. 10 is a perspective view of the connecting portion of the grommet 1 and the belted clamp 9A attached thereto.

  The fastening belt 9 is a fastening tool that includes a belt 91 wound around the grommet 1 and a belt holding portion 92 that holds the belt 91 in an annular shape. The belt holding portion 92 is a portion to which one end of the belt 91 is fixed, and holds the belt 91 in an annular shape in a state adjusted to a desired length. In addition, since the structure of the fastening belt 9 is well-known, detailed description of the structure is abbreviate | omitted.

  As shown in FIG. 9, the belt 91 of the fastening belt 9 is fitted into the recess 26 formed by the belt steps 241 and 251 with respect to the second connecting portion 21 of the second soft tubular member 20. Wrapped and tightened. Thereby, the outer surface of the 1st connection part 11 and the inner surface of the 2nd connection part 21 closely_contact | adhere in the pressurized state, and the water stop structure by the surface contact of two elastic members is completed.

  In addition, as shown in FIG. 10, it is conceivable that the fastening tool attached to the connection portion of the grommet 1 is a clamp with belt 9 </ b> A. The clamp with belt 9 </ b> A has a structure in which a clamp 93 is added to the belt holding portion 92 of the fastening belt 9. The clamp 93 is a tool that is fixed to the edge of the through hole formed in the plate-like support. In addition, since the structure of 9 A of clamps with a belt is known, the detailed description of the structure is abbreviate | omitted.

<Effect>
In the grommet 1, the second connecting portion 21 of the second soft cylindrical member 20 is put on the first connecting portion 11 of the first soft cylindrical member 10. That is, the grommet 1 has a water stop structure by surface contact between two elastic members. Therefore, according to the grommet 1, excellent water-stopping performance can be obtained by fastening the fastening belt 91 to the second connecting portion 21 that overlaps the outside of the first connecting portion 11.

  Further, since the grommet 1 is employed, sufficient water-stopping performance can be obtained only by attaching the fastening belt 91 in one place. Therefore, the fastening tool such as the fastening belt 9 or the belt-equipped clamp 9A. It is possible to reduce the required number of

  Further, in the grommet 1, a part of the hard cylindrical member 30 is inserted further inside the first connecting portion 11 that overlaps the inside of the second connecting portion 21. Therefore, even when the belt 91 is strongly tightened against the second connecting portion 21 that overlaps the outside of the first connecting portion 11, the first connecting portion 11 and the second connecting portion 21 made of an elastic material are deformed. The disadvantage of creating a gap between them is avoided.

  In the grommet 1, the portion of the second region 32 of the hard cylinder member 30 is formed on the first soft cylinder member 10 after the second connecting portion 21 of the second soft cylinder member 20 is folded back as shown in FIG. 6. The operation | work which covers the 1st connection part 11 is made easy. As a result, when the second connecting portion 21 is put on the first connecting portion 11, it is avoided that the second connecting portion 21 is rubbed and deformed with the first connecting portion 11 to form a gap in the water stop portion.

  In the grommet 1, the belt steps 241 and 251 indicate the correct mounting position of the belt 91 and prevent the belt 91 from being displaced in the axial direction of the grommet 1. Therefore, it is prevented that the water stopping performance due to the surface contact between the first connecting portion 11 and the second connecting portion 21 is deteriorated due to incomplete mounting position of the belt 91 or displacement of the belt 91.

  Further, in the grommet 1, the fitting structure between the overhanging portion 211 of the second soft cylindrical member 20 and the chipped portion 132 in the non-annular flange 13 of the first soft cylindrical member 10 is the first soft cylindrical member 10 and the second soft cylindrical member 10. It functions as a rotation stopper that prevents the displacement of the soft cylindrical member 20 in the circumferential direction. Therefore, when a force in the torsional direction is applied to the first soft cylinder member 10 or the second soft cylinder member 20, it is mitigated that the torsional force acts on the contact surfaces of the first connection part 11 and the second connection part 21. Is done.

  Therefore, by adopting the grommet 1, it is possible to avoid a decrease in water stoppage performance due to a positional shift in the circumferential direction of the first soft cylinder member 10 and the second soft cylinder member 20. In the grommet 1 shown in each figure, since the cross section of the inner peripheral surface of each of the second connecting portion 21 and the third connecting portion 22 is circular, the first soft tubular member 10 and the second soft tubular member 20 are twisted. When direction force is applied, it is relatively easy to rotate. In this case, the effect of the fitting structure of the overhang portion 211 and the notch portion 132 becomes more remarkable.

  Further, in the grommet 1, the first connecting portion side step 331 prevents the length of the first connecting portion 11 in the first soft cylindrical member 10, that is, the length of the portion covered by the hard cylindrical member 30 from varying. . Variation in the length of the first connecting portion 11 causes variation in water stoppage performance in the connecting portion of the grommet 1. Therefore, by adopting the grommet 1, the variation (decrease) in the water stopping performance due to the variation in the length of the first connecting portion 11 is avoided.

  Further, in the grommet 1, the second connecting portion side step 332 prevents the length of the second connecting portion 21 in the second soft cylindrical member 20, that is, the length of the portion covering the first connecting portion 11 from varying. To do. Variations in the length of the second connecting portion 21 cause variations in the water stopping performance at the connecting portion of the grommet 1. Therefore, by adopting the grommet 1, the variation (decrease) in the water stop performance due to the variation in the length of the second connecting portion 21 is avoided.

  In the grommet 1, the second inner step 14 and the third inner step 272 are also the length of the first connecting portion 11 in the first soft tubular member 10 and the length of the second connecting portion 21 in the second soft tubular member 20. Prevents variation.

  In the grommet 1, the inner side surface 302 of the hard cylindrical member 30 and the inner side surfaces of the first soft cylindrical member 10 and the second soft cylindrical member 20 are flush with each other. Thereby, since the protrusion which becomes the obstruction of insertion of a wire harness does not exist in the inner surface of the grommet 1, the operation | work which lets a wire harness pass to the grommet 1 becomes easy.

DESCRIPTION OF SYMBOLS 1 Grommet 9 Fastening belt 9A Clamp with belt 10 1st soft cylinder member 11 1st connection part 12 1st intermediate cylinder part 13 Non-annular collar part 14 2nd inner side level | step difference 19 1st panel mounting part 20 2nd soft cylinder member 21 2nd connection part 22 3rd connection part 23 2nd intermediate | middle cylinder part 24 1st annular collar part 25 2nd annular collar part 26 Depression 29 2nd panel mounting part 30 Hard cylinder member 31 1st area | region of a rigid cylinder member 32 Hard cylinder Second region of member 33 Boundary annular flange 91 Belt 92 Belt holding portion 93 Clamp 132 Notch portion 211 Overhang portion 241, 251 Belt step 271 First inner step 272 Third inner step 331 First connecting portion side step 332 First Two connection side step

Claims (11)

A cylindrical first soft cylinder member and a second soft cylinder member each made of an elastic material;
A grommet made of a material harder than the elastic material, and a cylindrical hard tube member inserted inside the end portions of the first soft tube member and the second soft tube member,
The outer peripheral surface of the first region that occupies a part of the range from one end of the first soft cylindrical member, and the inner peripheral surface occupies a part of the range from one end in the axial direction of the hard cylindrical member In a state of being in close contact with, the cylindrical first connecting portion that covers the hard cylindrical member,
It is a portion that occupies a part of the range from one end of the second soft cylindrical member, and is a cylindrical shape that covers the first connecting portion in a state where the inner peripheral surface is in close contact with the outer peripheral surface of the first connecting portion. A second connecting portion;
The hard cylindrical member in a state in which the inner peripheral surface is in close contact with the outer peripheral surface of the remaining second region other than the first region in the hard cylindrical member. A cylindrical third connecting portion to be covered with ,
On the outer peripheral surface of the portion on the back side of the first soft tube member in the first soft cylindrical member, a flange portion is formed that protrudes along the circumferential direction and a part of which is notched.
A grommet characterized in that a part of the second connecting part is formed with an overhanging part that protrudes along the axial direction of the second soft cylindrical member and fits into the chipped part of the flange part . On the outer peripheral surface of the hard cylindrical member, a first connecting portion side step that is an annular step that forms a boundary between the first region and the second region and contacts a tip of the first connecting portion is formed . The grommet according to claim 1. A first inner step which is an annular step is formed on the inner side surface of the third connecting portion in the second soft cylindrical member,
The grommet according to claim 1 or 2 , wherein a second connecting portion side step, which is an annular step contacting the first inner step, is formed on an outer peripheral surface of the second region of the hard cylindrical member . The end of the hard tube member on the first region side is in contact with the inner surface of the first soft tube member, and the inner surface of the hard tube member and the back side of the first connection portion of the first soft tube member A second inner step which is an annular step which is flush with the inner surface of the portion is formed,
An end on the second region side of the hard tube member is in contact with an inner surface of the second soft tube member, and is located on the inner side of the hard tube member and the third connection portion of the second soft tube member. third inner step is formed, the grommet according to any one of claims 1 to 3 which is of annular step to the inner surface flush portions. A cylindrical first soft cylinder member and a second soft cylinder member each made of an elastic material;
  A grommet made of a material harder than the elastic material, and a cylindrical hard tube member inserted inside the end portions of the first soft tube member and the second soft tube member,
  The outer peripheral surface of the first region that occupies a part of the range from one end of the first soft cylindrical member, and the inner peripheral surface occupies a part of the range from one end in the axial direction of the hard cylindrical member In a state of being in close contact with, the cylindrical first connecting portion that covers the hard cylindrical member,
  It is a portion that occupies a part of the range from one end of the second soft cylindrical member, and is a cylindrical shape that covers the first connecting portion in a state where the inner peripheral surface is in close contact with the outer peripheral surface of the first connecting portion. A second connecting portion;
  The hard cylindrical member in a state in which the inner peripheral surface is in close contact with the outer peripheral surface of the remaining second region other than the first region in the hard cylindrical member. A cylindrical third connecting portion to be covered with,
  On the outer peripheral surface of the hard cylindrical member, a first connecting portion side step that is an annular step that forms a boundary between the first region and the second region and contacts a tip of the first connecting portion is formed. Grommet characterized by. A first inner step which is an annular step is formed on the inner side surface of the third connecting portion in the second soft cylindrical member,
  The grommet according to claim 5, wherein a second connecting portion side step which is an annular step contacting the first inner step is formed on an outer peripheral surface of the second region in the hard cylindrical member.   The end of the hard tube member on the first region side is in contact with the inner surface of the first soft tube member, and the inner surface of the hard tube member and the back side of the first connection portion of the first soft tube member A second inner step which is an annular step which is flush with the inner surface of the portion is formed,
  An end on the second region side of the hard tube member is in contact with an inner surface of the second soft tube member, and is located on the inner side of the hard tube member and the third connection portion of the second soft tube member. The grommet of Claim 5 or Claim 6 in which the 3rd inner side level | step difference which is the cyclic | annular level | step difference which makes the inner surface of the part of this is the same is formed.   A cylindrical first soft cylinder member and a second soft cylinder member each made of an elastic material;
  A grommet made of a material harder than the elastic material, and a cylindrical hard tube member inserted inside the end portions of the first soft tube member and the second soft tube member,
  The outer peripheral surface of the first region that occupies a part of the range from one end of the first soft cylindrical member, and the inner peripheral surface occupies a part of the range from one end in the axial direction of the hard cylindrical member In a state of being in close contact with, the cylindrical first connecting portion that covers the hard cylindrical member,
  It is a portion that occupies a part of the range from one end of the second soft cylindrical member, and is a cylindrical shape that covers the first connecting portion in a state where the inner peripheral surface is in close contact with the outer peripheral surface of the first connecting portion. A second connecting portion;
  The hard cylindrical member in a state in which the inner peripheral surface is in close contact with the outer peripheral surface of the remaining second region other than the first region in the hard cylindrical member. A cylindrical third connecting portion to be covered with,
  A first inner step which is an annular step is formed on the inner side surface of the third connecting portion in the second soft cylindrical member,
  A grommet in which a second connecting portion side step which is an annular step contacting the first inner step is formed on the outer peripheral surface of the second region of the hard cylindrical member. The end of the hard tube member on the first region side is in contact with the inner surface of the first soft tube member, and the inner surface of the hard tube member and the back side of the first connection portion of the first soft tube member A second inner step which is an annular step which is flush with the inner surface of the portion is formed,
  An end on the second region side of the hard tube member is in contact with an inner surface of the second soft tube member, and is located on the inner side of the hard tube member and the third connection portion of the second soft tube member. The grommet of Claim 8 in which the 3rd inner side level | step difference which is a cyclic | annular level | step difference which makes the inner surface of the part of this is flush | planar is formed.   A cylindrical first soft cylinder member and a second soft cylinder member each made of an elastic material;
  A grommet made of a material harder than the elastic material, and a cylindrical hard tube member inserted inside the end portions of the first soft tube member and the second soft tube member,
  The outer peripheral surface of the first region that occupies a part of the range from one end of the first soft cylindrical member, and the inner peripheral surface occupies a part of the range from one end in the axial direction of the hard cylindrical member In a state of being in close contact with, the cylindrical first connecting portion that covers the hard cylindrical member,
  It is a portion that occupies a part of the range from one end of the second soft cylindrical member, and is a cylindrical shape that covers the first connecting portion in a state where the inner peripheral surface is in close contact with the outer peripheral surface of the first connecting portion A second connecting portion;
  The hard cylindrical member in a state in which the inner peripheral surface is in close contact with the outer peripheral surface of the remaining second region other than the first region in the hard cylindrical member. A cylindrical third connecting portion to be covered with,
  The end of the hard tube member on the first region side is in contact with the inner surface of the first soft tube member, and the inner surface of the hard tube member and the back side of the first connection portion of the first soft tube member A second inner step which is an annular step which is flush with the inner surface of the portion is formed,
  An end on the second region side of the hard tube member is in contact with an inner surface of the second soft tube member, and is located on the inner side of the hard tube member and the third connection portion of the second soft tube member. A grommet characterized in that a third inner step which is an annular step which is flush with the inner surface of the portion is formed. 11. The belt step, which is a pair of steps forming a recess into which a belt for fastening the second connection portion is fitted, is formed on the outer peripheral surface of the second connection portion. The grommet according to item 1.

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