JP2013245776A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet which can be easily fixed to a fixing member without elastically modifying the grommet significantly, thereby preventing cracks in the grommet, while allowing installation even if a thickness of the fixing member is changed, resulting in a versatile grommet.SOLUTION: An anti-vibration grommet is formed of a rubber-like elastic body, shows a tubular shape, and includes a groove part to fit the edge portion of a hole part of a fixing member therein on the outer circumferential surface thereof. The grommet is axially divided into two split bodies, one is inserted into the hole part from axial one side, and the other divided body is inserted from the axial other side. Both the split bodies include retaining engagement parts which are engaged with each other, after insertion, to form a retainer, and the retaining engagement parts are engaged with each other so as to be slidable in the axial direction so that the grommet can be mounted even when the thickness of the fixing member is changed.

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, since the grommet 51 is manufactured in a dedicated shape in accordance with the shape of the mounting member 61, if the plate thickness dimension of the mounting member 61 is changed, it is necessary to make it again in a new shape, which is not versatile.

JP 2008-95885 A

  In view of the above points, the present invention eliminates the need for a large elastic deformation of the grommet when the grommet is attached to the attachment member, so that the grommet is free from cracks and the like, and can be easily attached. The purpose is to provide.

  In addition to this, it is an object to provide a grommet that can be fitted with a grommet even if the plate thickness dimension of the mounting member is changed.

  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 an engaging portion for retaining to be engaged with each other after the insertion to prevent the retaining member from being attached to each other, and the shafts can be attached to each other so that they can be mounted even if the thickness of the mounting member is changed. The detachable engagement portion engages with the detachable engagement portion after being slidable in the direction.

  The grommet according to claim 2 of the present invention is the grommet according to claim 1 described above, wherein the one divided body is seated on one surface in the plate thickness direction of the mounting member; An outer cylinder portion that is provided on the inner peripheral side and is inserted into the hole portion, and the other divided body is a seat portion that is seated on the other surface in the plate thickness direction of the mounting member; and And an inner cylinder portion that is provided on the inner circumferential side and is inserted into the inner circumferential side of the outer cylinder portion, and the engagement portion for retaining is provided on the inner circumferential surface of the outer cylinder portion. It is a combination of a protrusion and an engaging protrusion provided on the outer peripheral surface of the inner cylinder portion, and the engagement protrusion is engaged from a state in which a play gap is set between the both engaging protrusions. The two divided bodies should be slidable in the axial direction between And features.

  The grommet according to claim 3 of the present invention is the grommet according to claim 1 or 2, wherein the one divided body includes a slit between the seat portion and the outer cylinder portion, and / or the other grommet. The divided body includes a slit between the seating portion and the inner cylinder portion, and the grommet is capable of adjusting a spring constant of the grommet according to the size or shape of the slit.

  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. In addition, these divided bodies are slidable in the axial direction so that they can be mounted even if the plate thickness of the mounting member is changed, and the engaging portions for retaining are engaged. It is possible to cope with a change in the plate thickness dimension of the member.

  It is preferable that the one and the other divided bodies have the following structure.

  That is, one divided body is integrally provided with a seating portion seated on one surface in the plate thickness direction of the mounting member and an outer cylinder portion provided on the inner peripheral side of the seating portion and inserted into the hole portion. The other divided body is integrally provided with a seating portion that is seated on the other surface in the plate thickness direction of the mounting member, and an inner cylindrical portion that is provided on the inner peripheral side of the seating portion and that is inserted into the inner peripheral side of the outer cylindrical portion. Shall. The retaining engagement portion is a combination of an engagement protrusion provided on the inner peripheral surface of the outer cylinder portion and an engagement protrusion provided on the outer peripheral surface of the inner cylinder portion. Since both the split bodies are slidable in the axial direction from the state in which the play gap is set between the both engaging protrusions to the state in which the both engaging protrusions are engaged, in this sliding range It is possible to cope with a change in the thickness of the mounting member.

  In the above structure, one divided body is integrally provided with a seating portion that is seated on one surface in the plate thickness direction of the mounting member and an outer cylinder portion that is provided on the inner peripheral side of the seating portion and is inserted into the hole portion. Therefore, it is possible to reduce the spring constant of one of the divided bodies by providing a slit between the seating portion and the outer cylinder portion, and when providing the slit in this way, the size and shape of the slit are changed. Thus, the spring constant of one of the divided bodies can be adjusted. Similarly, the other divided body is integrally formed with a seating portion that is seated on the other surface in the plate thickness direction of the mounting member, and an inner cylindrical portion that is provided on the inner peripheral side of the seating portion and that is inserted on the inner peripheral side of the outer cylindrical portion. Therefore, it is possible to reduce the spring constant of the other divided body by providing a slit between the seating portion and the inner cylinder portion. The spring constant of the other divided body can be adjusted by changing the shape. Therefore, it is possible to adjust the spring constant of the entire grommet.

  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 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. Accordingly, 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 attachment work. In addition, these divided bodies are slidable in the axial direction so that they can be mounted even if the plate thickness of the mounting member is changed, and the engaging portions for retaining are engaged. It is possible to cope with a change in the plate thickness dimension of the member. Therefore, the grommet can be mounted even if the plate thickness dimension of the mounting member is changed, so that the grommet can have versatility.

  In addition, when a slit is provided in the divided body and the spring constant of the grommet is adjusted according to the size or shape of the slit, the spring constant of the grommet can be adjusted without changing the external shape of the grommet, rubber material, rubber hardness, etc. The product specifications can be diversified.

  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 depending on the combination of these. .

Sectional drawing which shows the state before attaching the grommet which concerns on the Example of this invention to an attachment member. Sectional drawing which shows the state after attaching the grommet to an attachment member Sectional drawing which shows the state after attaching the grommet to the attachment member from which board thickness dimension differs 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) In addition, 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) The grommet can be slid up and down by dividing the grommet into two parts, and variations in the plate thickness can be absorbed.
(4) In the conventional grommet, it was difficult to provide a slit in the groove portion because it was formed by integral molding. However, the slit can be easily provided by dividing the grommet into two parts, and the spring constant depends on the slit shape. Can be adjusted.

  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 has an annular groove portion (concave fitting portion) for fitting the peripheral edge portion 63 of the hole portion 62 of one mounting member 61 into the outer peripheral surface thereof. (Also referred to as FIG. 2 or FIG. 3), which is an anti-vibration grommet that is divided into two in the axial direction (vertical direction in the figure) and axially relative to the hole 62 of the mounting member 61 One split body 21 inserted from one side (upper in the figure) and the other split body 31 inserted from the other axial direction (downward in the figure), After the insertion, there is provided a retaining engagement portion 41 for engaging each other to prevent the hole 62 from coming off. The retaining portion 41 for retaining is engaged after the one and the other divided bodies 21 and 31 are slidable in the axial direction so that they can be mounted even if the thickness of the mounting member 61 is changed. This point will be described later.

  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.

  One divided body 21 is configured as follows.

  That is, one of the divided bodies 21 has an annular base 22 having a substantially square cross section, and one end of the mounting member 61 in the plate thickness direction on the end surface (the lower surface in the figure) facing the mounting member 61. An annular seat portion 23 seated on the surface (upper surface in the figure) is integrally formed vertically in the figure, and is located on the inner peripheral side of the seat portion 23 and is inserted into the hole portion 62 of the mounting member 61 The part 24 is also integrally formed in the vertical direction in the figure. An annular first engaging protrusion 25 is provided radially inward on the inner peripheral surface of the distal end portion (lower end portion in the figure) of the outer cylinder portion 24, and the annular second engaging protrusion is formed on the inner peripheral surface of the base portion 22. 26 is provided inward in the radial direction. In addition, an annular slit 27 is provided between the seat portion 23 and the outer cylinder portion 24 so as to open in the vertical direction in the figure.

  The other divided body 31 is configured as follows.

  In other words, the other divided body 31 has an annular base portion 32 having a substantially square cross section, and the other end surface (upper surface in the drawing) of the base portion 32 facing the mounting member 61 is connected to the other side in the plate thickness direction of the mounting member 61. An annular seat portion 33 seated on the surface (the lower surface in the figure) is integrally formed upward in the figure, and is positioned on the inner peripheral side of the seat portion 33 so as to be within the outer cylinder portion 24 of one divided body 21. Similarly, the inner cylinder part 34 inserted into the peripheral side is integrally formed upward in the figure. An annular third engagement protrusion 35 is provided on the outer peripheral surface of the inner cylinder portion 34 so as to be directed radially outward. Further, an annular slit 37 is provided between the seating portion 33 and the inner cylinder portion 34 so as to open upward in the figure.

  In addition, the groove part 13 of the grommet 11 has the seat part 23 and the outer cylinder part 24 of one division body 21, and the other in the state where one and the other division bodies 21 and 31 are combined unless the slits 27 and 37 are provided. However, since the slits 27 and 37 are provided, the groove width dimension is enlarged at the bottom of the groove.

  When the one and the other divided bodies 21 and 31 having the above-described configuration are attached to the attachment member 61, the outer cylinder portion 24 of the one divided body 21 is inserted into the hole 62 from one axial direction as shown in FIG. The portion 23 is seated on one surface in the plate thickness direction of the mounting member 61, and the inner cylindrical portion 34 in the other divided body 31 is inserted from the other axial direction to the inner peripheral side of the outer cylindrical portion 24 in the one divided body 21. The seat portion 33 is seated on the other surface in the plate thickness direction of the mounting member 61. At this time, one of the first engagement protrusions 25 in the one divided body 21 and the third engagement protrusion 35 in the other divided body 31 is the other. The first engagement protrusion 25 is positioned on the other side in the axial direction of the third engagement protrusion 35 and the third engagement protrusion 35 is the axis of the first engagement protrusion 25. Direction on one side It will be.

  Therefore, even if one of the divided bodies 21 is moved away from the mounting member 61, that is, in the axial direction, the first engaging protrusion 25 is engaged with the third engaging protrusion 35, so that the one divided body 21 is mounted. Similarly, the third engagement protrusion 35 is engaged with the first engagement protrusion 25 even if the other divided body 31 attempts to move away from the mounting member 61, that is, in the axial direction. Therefore, the other divided body 31 is prevented from coming off without being detached from the attachment member 61.

  At this time, as shown in FIG. 2, the seating portion 23 of one divided body 21 is seated on one surface in the plate thickness direction of the mounting member 61 and the seating portion 33 of the other divided body 31 is seated on the mounting member 61. In the state of being seated on the other surface in the plate thickness direction, an axial play gap c is set between the first engagement protrusion 25 and the third engagement protrusion 25 over a predetermined size. Yes. Therefore, one and the other divided body from the state in which the play gap c is set in this way to the state in which both the engaging projections 25 and 35 shown in FIG. 3 are engaged (the state in which the play gap c has disappeared) is reached. 21 and 31 are slidable in the axial direction, that is, the above-described retaining portion 41 is configured so that one and the other divided bodies 21 and 31 are engaged with each other after being slidable in the axial direction. Therefore, it is possible to cope with a change in the plate thickness dimension of the mounting member 61 within the sliding range.

As shown in FIG. 2, the slide end where the one and the other divided bodies 21 and 31 slide in the direction approaching each other is the second engagement protrusion 26 in the one divided body 21 and the third engagement in the other divided body 31. It is determined by the engagement of the protrusion 35 and / or the contact of the distal end of the outer cylinder portion 24 in one divided body 21 and the base 32 in the other divided body 31. On the other hand, as shown in FIG. 3, the slide end where the one and the other divided bodies 21 and 31 slide in the direction away from each other is related to the first engagement protrusion 25 and the third engagement protrusion 35 as described above. It is determined by combining. Accordingly, the one and the other divided bodies 21 and 31 can be slid in the range from FIG. 2 to FIG. 3 in this way, in other words, from the minimum thickness t ₁ shown in FIG. 2 to FIG. It is possible to cope with a change in the plate thickness dimension of the mounting member 61 within the range of the maximum plate thickness dimension t ₂ shown.

  In the grommet 11 having the above-described configuration, one divided body 21 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 31 is provided, and each of the divided bodies 21 and 31 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 21 and 31 are provided with the retaining engagement portions 41 that are engaged with each other to prevent the separation after being inserted into the hole portion 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 these divided bodies 21 and 31 are made slidable in the axial direction so that they can be mounted even if the plate thickness dimension of the mounting member 61 is changed, the retaining member 41 for retaining is engaged. It is possible to cope with a change in the plate thickness dimension of the attachment member 61 within a range in which both the divided bodies 21 and 31 slide. Therefore, the grommet 11 can be mounted even if the plate thickness dimension of the mounting member 61 is changed, so that the grommet 11 can be versatile.

  Further, since the split bodies 21 and 31 are provided with slits 27 and 37 and the spring constant of the grommet 11 can be adjusted by the size or shape of the slits 27 and 37, the outer shape of the grommet 11, the rubber material, The spring constant of the grommet 11 can be changed at the design stage without changing the rubber hardness or the like. Accordingly, products having different spring constants can be provided even if the grommet 11 has the same external shape, and thus product specifications can be diversified.

  The one and the other divided bodies 21 and 31 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 21 and 31 are set to have the same rubber hardness, but may be set to have different rubber hardness. According to these, combinations of rubber materials or rubber hardness are diversified, so that the product specifications of the grommet 11 can be diversified depending on any of these combinations.

DESCRIPTION OF SYMBOLS 11 Grommet 12 Center shaft hole 13 Groove part 21 One division body 22,32 Base part 23,33 Seating part 24 Outer cylinder part 25,26,35 Engagement protrusion 27,37 Slit 31 Other division body 34 Inner cylinder part 41 Retaining prevention Engaging portion 61 mounting member 62 hole 63 peripheral edge c play gap

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 an engaging portion for retaining to be engaged with each other after the insertion to prevent the retaining member from being attached to each other, and the shafts can be attached to each other so that they can be mounted even if the thickness of the mounting member is changed. A grommet which is slidable in a direction and engages with the retaining portion for retaining. The grommet according to claim 1,
The one divided body is integrally provided with a seating portion seated on one surface in the plate thickness direction of the mounting member, and an outer cylinder portion provided on the inner peripheral side of the seating portion and inserted into the hole portion,
The other divided body is a seat portion that is seated on the other surface in the plate thickness direction of the mounting member, and an inner cylinder portion that is provided on the inner peripheral side of the seat portion and inserted into the inner peripheral side of the outer cylinder portion. With
The retaining portion for retaining is composed of a combination of an engagement protrusion provided on the inner peripheral surface of the outer cylinder portion and an engagement protrusion provided on the outer peripheral surface of the inner cylinder portion,
The two divided bodies are slidable in the axial direction from a state in which a play gap is set between the both engaging protrusions to a state in which the both engaging protrusions are engaged. Grommet. The grommet according to claim 1 or 2,
The one divided body is provided with a slit between the seating portion and the outer cylinder portion, and / or the other divided body is provided with a slit between the seating portion and the inner cylinder portion, and the grommet is formed of the slit. A grommet characterized in that the spring constant of the grommet can be adjusted by size or shape. 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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