JP5964130B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet according to a vibration isolation technique. The grommet of the present invention is used, for example, in the related field of vehicles such as automobiles, or in the field of general industrial machinery.

  Conventionally, as shown in FIG. 4, a cylindrical grommet 51 made of a rubber-like elastic body is known. As shown in the figure, this grommet 51 has a groove 53 provided on the outer peripheral surface thereof and one mounting member 61. By fitting the peripheral edge 63 of the hole 62, it is attached to one attachment member (for example, an intake pipe bracket) 61, and the other attachment member is fastened to the nut 65 by fastening a bolt 64 inserted into the central shaft hole 52 thereof. It is attached to (for example, a vehicle body) 66 and exhibits a function of connecting both attachment members 61 and 66 after vibration isolation.

  However, since this grommet 51 is formed as an integral molded product of a rubber-like elastic body, there are the following problems.

  That is, since the outer diameter of the grommet 51 is set to be larger than the inner diameter of the hole 62 of the one attachment member 61, it is necessary to elastically deform the grommet 51 when attaching the grommet 51 to the one attachment member 61. Therefore, a crack etc. may occur in grommet 51 at the time of attachment.

  In addition, since it is necessary to carefully attach the grommet 51 so that the grommet 51 is not elastically deformed so that cracks or the like are not generated, the attaching operation requires skill and takes a lot of labor and time. In addition, when it is difficult to attach the grommet 51 in this manner, it is also difficult to remove the grommet 51.

  Further, when the bolt 64 and the nut 65 are fastened, a rotational torque acts on the grommet 51, so that the grommet 51 is attached in a circumferentially twisted state, and this fastens the bolt 64 and the nut 65. May cause loosening.

JP 2008-95885 A

  In view of the above points, the present invention eliminates the need to greatly elastically deform the grommet when the grommet is attached to the attachment member. The purpose is to provide.

  In addition, an object of the present invention is to provide a grommet in which the grommet is not rotated when the bolt and nut are fastened, and thus the grommet is not attached in a state of being twisted in the circumferential direction.

In order to achieve the above object, a grommet according to claim 1 of the present invention is made of a rubber-like elastic body, has a cylindrical shape, and has an outer peripheral surface provided with a groove portion into which a peripheral edge portion of a hole portion of a mounting member is fitted. In this grommet, the grommet is provided with one divided body inserted from one axial direction into the hole by being divided into two in the axial direction, and the other divided body inserted from the other axial direction, The one and the other divided bodies are provided with a retaining engagement portion that engages with each other to prevent the separation after the insertion , and the grommet includes a small-diameter annular portion corresponding to a groove bottom portion of the groove portion, and the small-diameter portion. A first large-diameter annular portion disposed on one axial direction of the annular portion, and a second large-diameter annular portion disposed on the other axial direction of the small-diameter annular portion, wherein the first large-diameter annular portion and In a part of the circumference of the small-diameter annular part The first arc portion is formed by the one divided body, and the second arc portion which is the remaining part of the circumference of the second large diameter annular portion and the small diameter annular portion is formed by the other divided body. The first and second arc portions are provided with the retaining engagement portions .

The grommet according to claim 2 of the present invention is a vibration-proof grommet that is made of a rubber-like elastic body, has a cylindrical shape, and has a groove portion that fits the peripheral edge portion of the hole portion of the mounting member on the outer peripheral surface. The grommet is provided with one divided body that is inserted into the hole from one side in the axial direction by being divided into two in the axial direction, and the other divided body that is inserted from the other in the axial direction. After the insertion, the divided body includes a retaining engagement portion that engages with each other to prevent the separation, and the grommet is placed at a position corresponding to the inner surface of the groove in the one and / or the other divided body. An anti-rotation engaging portion that engages with an engaging portion provided on the attachment member to prevent the attachment member from rotating is provided .

Further, the grommet according to claim 3 of the present invention is a vibration-proof grommet made of a rubber-like elastic body, having a cylindrical shape, and provided with a groove portion into which the peripheral edge portion of the hole portion of the mounting member is fitted on the outer peripheral surface. The grommet is provided with one divided body that is inserted into the hole from one side in the axial direction by being divided into two in the axial direction, and the other divided body that is inserted from the other in the axial direction. The divided body includes a locking engagement portion that engages with each other to prevent locking after the insertion, and the grommet includes a small-diameter annular portion corresponding to a groove bottom portion of the groove portion and an axial direction of the small-diameter annular portion. A first large-diameter annular portion disposed on one side and a second large-diameter annular portion disposed on the other axially other side of the small-diameter annular portion, of which the first large-diameter annular portion and the small-diameter annular portion The first arc on the circumference is the front A second arc portion formed by one of the divided bodies and a remaining part of the circumference of the second large-diameter annular portion and the small-diameter annular portion is formed by the other divided body, and the first and second The retaining member is provided on the arcuate portion so that the grommet is prevented from rotating with respect to the mounting member at a position corresponding to the inner surface of the groove in the one and / or the other divided body. An anti-rotation engaging portion that engages with the provided engaging portion is provided .

The grommet according to a fourth aspect of the present invention is the grommet according to the first, second, or third aspect , wherein the one and the other divided bodies are formed of the same kind of rubber material or different kinds of rubber. It is formed by a material.

Furthermore, the grommet according to claim 5 of the present invention is the grommet according to claim 1, 2, 3 or 4 , wherein the one and the other divided bodies are set to have the same rubber hardness, or the rubber hardness. Are set to be different from each other.

  In the present invention having the above configuration, the grommet is divided into two in the axial direction, so that one divided body inserted from one axial direction into the hole portion of the mounting member and the other inserted from the other axial direction. Since each of the divided bodies is provided with a divided body, it can be formed into a shape that does not need to be greatly elastically deformed when attached to the mounting member. In addition, since these divided bodies are provided with a retaining engagement portion that engages with each other to prevent the separation after being inserted into the hole portion, it is difficult to be detached from the mounting member.

  An anti-vibration grommet made of a rubber-like elastic body that has a cylindrical shape and is provided with a groove portion that fits the peripheral edge portion of the hole portion of the mounting member on the outer peripheral surface. Since it has a small-diameter annular portion, a first large-diameter annular portion disposed on one axial direction of the small-diameter annular portion, and a second large-diameter annular portion disposed on the other axial direction of the small-diameter annular portion, the above 2 At the time of division, the first arc portion which is a part of the circumference of the first large-diameter annular portion and the small-diameter annular portion is formed by one divided body, and the circumference of the second large-diameter annular portion and the small-diameter annular portion It is preferable to form the second arc portion, which is the upper remaining portion, by the other divided body, and according to this, the first arc portion is inserted from one axial direction into the hole of the mounting member and the other axial direction By inserting the second arc portion from It is can be attached without listening elastically deformed. In this case, a retaining engagement portion is provided in the first and second arc portions.

  As a specific example of the retaining portion for retaining, it is preferable to use a combination of a pair of claw-shaped portions that are engaged with each other in the retaining direction, and according to this, the claw-shaped portions are engaged with each other, Secure retaining is achieved. Also, in this case, it is preferable to provide an inclined guide surface at the tip of one of the claw-shaped portions so that the other claw-shaped portion is easily elastically deformed when inserted. Since the one claw-shaped portion easily gets over the other claw-shaped portion by pressing in the axial direction, the claw-shaped portions can be easily engaged with each other.

  In addition, a bolt and nut can be fastened by providing an anti-rotation engaging portion at a position corresponding to the inner surface of the groove portion in one and / or the other divided body and engaging this with an engaging portion provided in the mounting member. It is possible to prevent the grommets from circulating around.

  The one and the other divided bodies may be molded from the same type of rubber material, but may be molded from different types of rubber materials. In addition, the one and the other divided bodies may have the same rubber hardness, but the rubber hardness may be different from each other. According to these, combinations of rubber materials or rubber hardness are diversified. Therefore, it is possible to diversify product specifications.

  The present invention has the following effects.

  That is, as described above, in the present invention, the grommet is divided into two parts in the axial direction, so that one divided body inserted from one side in the axial direction into the hole portion of the mounting member, and inserted from the other side in the axial direction. Since the other divided body is provided, any of these divided bodies can be formed into a shape that does not need to be greatly elastically deformed when attached to the attachment member. In addition, since these divided bodies are provided with a retaining engagement portion that engages with each other to prevent the separation after being inserted into the hole portion, it is difficult to be detached from the mounting member. Therefore, since it is not necessary to elastically deform the grommet when the grommet is attached to the attachment member, it is possible to prevent the grommet from being cracked and to facilitate the attaching operation.

  When the retaining portion is a combination of a pair of claw-shaped portions, the claw-shaped portions can be engaged with each other to ensure reliable retaining, and the tip of one claw-shaped portion is inclined. When a planar guide surface is provided, the claws can be easily engaged with each other by pressing the divided members in the axial direction.

  In addition, when a projection-like detent is provided at a position corresponding to the inner surface of the groove in the divided body and this is engaged with a recess provided in the mounting member, the grommet is rotated when the bolt and nut are fastened. Therefore, it is possible to prevent the grommet from being attached while being twisted in the circumferential direction.

  In addition, when one and the other divided body are molded from different types of rubber materials or the rubber hardness is set to be different from each other, the product specifications can be diversified.

It is a figure which shows the grommet which concerns on the Example of this invention, (A) is a perspective view which shows the state before assembling the grommet, (B) is a perspective view which shows the state after assembling the grommet It is a figure which shows the grommet, (A) is sectional drawing which shows the state before assembling the grommet, (B) is sectional drawing which shows the state after assembling the grommet It is a figure which shows the grommet, (A) is sectional drawing which shows the state before attaching the grommet to an attachment member, (B) is sectional drawing which shows the state after attaching the grommet to an attachment member Sectional drawing which shows the attachment state of the grommet which concerns on a prior art example

The present invention includes the following embodiments.
(1) In the present invention, the grommet is divided into two parts to improve the assembling property, and deformation and cracking due to the assembling are prevented.
(2) Different rubber materials and rubber hardness can be combined by using the two-part type, even if the required specifications (heat resistance, oil resistance, support load, etc.) differ depending on the installation location. It becomes possible to cope by combining the hardness.
(3) Dividing the grommet into two makes it easier to provide a protrusion, and using the protrusion as a stopper prevents rotation in the twisting direction.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show a grommet 11 according to an embodiment of the present invention. The grommet 11 according to the embodiment is made of a rubber-like elastic body, has a cylindrical shape, and is provided with an annular groove portion 13 for fitting the peripheral edge portion 63 of the hole portion 62 of one attachment member 61 to the outer peripheral surface. A dimming grommet, which is divided into two parts in the axial direction (vertical direction in the drawing) and inserted into the hole 62 of the mounting member 61 from one axial direction (downward in the drawing). , And the other divided body 15 inserted from the other in the axial direction (above in the figure), and the one and other divided bodies 14 and 15 are engaged with each other after being inserted to prevent the holes 62 from coming off. A retaining engagement portion 16 for making an eggplant is provided.

  One mounting member 61 is a plate-like member, for example, an intake pipe bracket in a vehicle such as an automobile, and the peripheral portion 63 of the hole 62 provided in the one mounting member 61 is fitted into the groove portion 13. Thus, the grommet 11 is attached to one attachment member 61. The grommet 11 is attached to the other attachment member (not shown) by inserting a bolt (not shown) into the central shaft hole 12 and fastening it to a nut (not shown). A bush (not shown) made of a rigid material such as metal is often interposed between the grommet 11 and the bolt in order to fix the bolt tightening to a fixed size. The other mounting member is, for example, a vehicle body in a vehicle such as an automobile. Therefore, the grommet 11 exhibits a function of connecting both the mounting members after vibration isolation.

  In addition, as shown in FIG. 2B, the grommet 11 according to this embodiment has a small-diameter annular portion 11A corresponding to the groove bottom portion of the groove portion 13 and a first large-diameter arranged on one axial direction of the small-diameter annular portion 11A. 11C, and a second large-diameter annular portion 11C disposed on the other axial direction of the small-diameter annular portion 11A. Among these, a part of the circumference of the first large-diameter annular portion 11B and the small-diameter annular portion 11A ( The first arc portion 11Aa, which is a portion in the range of approximately 180 degrees on the plane, is formed by one of the divided bodies 14, and the remaining part of the circumference (plane) of the second large-diameter annular portion 11C and the small-diameter annular portion 11A The second arcuate portion 11Ab, which is an approximately 180 degree range), is formed by the other divided body 15, and the retaining engagement portions 16 are respectively provided at the circumferential upper ends of the first and second arcuate portions 11Aa and 11Ab. Establishment It has been.

  The retaining engagement portion 16 is a combination of a pair of claw-shaped portions 17 and 18 that are engaged with each other in the retaining direction, and the other claw-shaped portion 18 is inserted into the tip of one claw-shaped portion 17. A downwardly inclined guide surface 19 is provided toward the tip for facilitating elastic deformation at times, and a similar guide surface 20 having the same inclined surface corresponding to the tip of the other claw-like portion 18 is provided. Is provided.

  Further, the mounting member 61 is provided at the position corresponding to the inner surface of the groove 13 in the one divided body 14 and at the end surface position of the first large-diameter annular portion 11B to prevent the grommet 11 from rotating with respect to the one mounting member 61. A protrusion-like detent engaging portion 21 that engages with the provided hole-shaped engaging portion 67 is provided, and the second large-diameter annular portion is located at a position corresponding to the inner surface of the groove portion 13 in the other divided body 15. Also at the end face position of 11C, there is a projection-like detent engagement portion 22 that engages with a hole-shaped engagement portion 68 provided in the attachment member 61 so as to prevent the grommet 11 from rotating with respect to one attachment member 61. Is provided. Instead of this, the hole-shaped engaging portions 67 and 68 may be concave-shaped engaging portions, and the relationship between the concaves and convexes may be reversed.

  In the grommet 11 having the above-described configuration, one divided body 14 inserted from one axial direction into the hole 62 of one mounting member 61 by being divided into two in the axial direction, and inserted from the other axial direction. The other divided body 15 is provided, and each of the divided bodies 14 and 15 has a shape that does not need to be greatly elastically deformed when being attached to the attachment member 61. Further, since the divided bodies 14 and 15 are provided with the retaining engagement portions 16 that are engaged with each other to prevent the separation after being inserted into the hole 62, they are not detached from the attachment member 61. Accordingly, when attaching the grommet 11 to the attachment member 61, it is not necessary to greatly deform the grommet 11, so that it is possible to prevent the grommet 11 from being cracked, and attachment work and further removal work are easy. Can be

  Further, since the retaining portion 16 for retaining is configured to engage the claw-shaped portions 17 and 18 provided at the circumferential upper ends of the first and second arc portions 11Aa and 11Ab, respectively, it is ensured. Engagement and extension can be achieved reliably.

  In addition, since the inclined guide surfaces 19 and 20 are provided at the tip portions of the claw-shaped portions 17 and 18, only the divided members 14 and 15 are pressed in the axial direction so that one claw-shaped portion 17 can be moved to the other. The claw-like portion 18 easily gets over. Accordingly, it is possible to provide a retaining structure by the claw-like portions 17 and 18 having a structure that can be easily engaged and not easily detached.

  Further, since the protrusion-like anti-rotation engaging portions 21 and 22 are provided at positions corresponding to the inner surfaces of the groove portions 13 in the one and the other divided bodies 14 and 15, the anti-rotation engaging portions 21 and 22 are provided. Is engaged with the hole-shaped engaging portions 67 and 68 provided on the mounting member 61, so that the grommet 11 is prevented from rotating when the bolt and nut are fastened. Therefore, it is possible to prevent the grommet 11 from being attached in a state of being twisted in the circumferential direction, and thus it is possible to prevent the bolt and nut from being loosened early.

  The one and other divided bodies 14 and 15 are formed of the same kind of rubber material, but may be formed of different kinds of rubber materials. The one and the other divided bodies 14 and 15 are set to have the same rubber hardness, but may be set to have different rubber hardness. And according to these, since the combinations of the rubber material or the rubber hardness are diversified, it is possible to diversify the grommet product specifications.

11 Grommet 11A Small-diameter annular portion 11Aa First arc portion 11Ab Second arc portion 11B First large-diameter annular portion 11C Second large-diameter annular portion 12 Center shaft hole 13 Groove portion 14 One divided body 15 The other divided body 16 For retaining Engaging portion 17, 18 Claw-like portion 19, 20 Guide surface 21, 22 Anti-rotating engaging portion 61 Mounting member 62 Hole portion 63 Peripheral portion 67, 68 Engaging portion

Claims (5)

In the grommet for vibration isolation, which is made of a rubber-like elastic body, has a cylindrical shape, and is provided with a groove portion into which the peripheral edge portion of the hole portion of the mounting member is fitted on the outer peripheral surface.
The grommet is provided with one divided body inserted from one axial direction into the hole by being divided into two in the axial direction, and the other divided body inserted from the other axial direction,
The one and the other divided bodies are provided with a retaining engagement portion that engages with each other to prevent the separation after the insertion ,
The grommet includes a small-diameter annular portion corresponding to the groove bottom portion of the groove portion, a first large-diameter annular portion disposed on one axial direction of the small-diameter annular portion, and a first axial portion disposed on the other axial direction of the small-diameter annular portion. Two large-diameter annular portions, of which a first arc portion that is a part of the circumference of the first large-diameter annular portion and the small-diameter annular portion is formed by the one divided body and the second large-diameter portion. A second circular arc portion that is the remaining part of the circumference of the circular annular portion and the small annular portion is formed by the other divided body;
The grommet characterized in that the first and second arc portions are provided with the retaining engagement portions . In the grommet for vibration isolation, which is made of a rubber-like elastic body, has a cylindrical shape, and is provided with a groove portion into which the peripheral edge portion of the hole portion of the mounting member is fitted on the outer peripheral surface.
The grommet is provided with one divided body inserted from one axial direction into the hole by being divided into two in the axial direction, and the other divided body inserted from the other axial direction,
The one and the other divided bodies are provided with a retaining engagement portion that engages with each other to prevent the separation after the insertion,
An anti-rotation engagement that engages an engagement portion provided on the attachment member to prevent the grommet from rotating relative to the attachment member at a position corresponding to the inner surface of the groove portion in the one and / or the other divided body. Grommet characterized by having a portion . In the grommet for vibration isolation, which is made of a rubber-like elastic body, has a cylindrical shape, and is provided with a groove portion into which the peripheral edge portion of the hole portion of the mounting member is fitted on the outer peripheral surface.
The grommet is provided with one divided body inserted from one axial direction into the hole by being divided into two in the axial direction, and the other divided body inserted from the other axial direction,
The one and the other divided bodies are provided with a retaining engagement portion that engages with each other to prevent the separation after the insertion,
The grommet includes a small-diameter annular portion corresponding to the groove bottom portion of the groove portion, a first large-diameter annular portion disposed on one axial direction of the small-diameter annular portion, and a first axial portion disposed on the other axial direction of the small-diameter annular portion. Two large-diameter annular portions, of which a first arc portion that is a part of the circumference of the first large-diameter annular portion and the small-diameter annular portion is formed by the one divided body and the second large-diameter portion. A second circular arc portion that is the remaining part of the circumference of the circular annular portion and the small annular portion is formed by the other divided body;
The first and second arc portions are provided with the retaining engagement portions.
An anti-rotation engagement that engages an engagement portion provided on the attachment member to prevent the grommet from rotating relative to the attachment member at a position corresponding to the inner surface of the groove portion in the one and / or the other divided body. Grommet characterized by having a portion . The grommet according to claim 1, 2, or 3 ,
The grommet characterized in that the one and the other divided bodies are formed of the same type of rubber material or different types of rubber materials. The grommet according to claim 1, 2, 3 or 4 ,
The grommet characterized in that the one and the other divided bodies have the same rubber hardness or different rubber hardness.

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