JP2020034120A - Vibration control grommet - Google Patents

Abstract

To improve durability.SOLUTION: A vibration control grommet 101 puts a shaft hole 112 through a columnar elastic body 111 composed of a rubber-like elastic material. An outer peripheral surface 111b of the elastic body 111 is provided with an installation groove 114. The elastic body 111 is fixed by a bolt 151 going through the shaft hole 112 to a member on the support side, for example, a body 201 of an automobile, and a member on a supported side, for example, a housing 301 of an electrical equipment unit, is engaged with the fitting groove 114 and supported. The elastic body 111 arranges a plurality of projections 116 at a position nearer the outer peripheral side with respect to an inner peripheral side on an end surface 111a. The projections 116 are crushed as they are pressed against mating members and, when the elastic body 111 is compressed in an axial direction by prescribed pressure, all over the end surface 111a is adhered to the mating members.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an anti-vibration grommet.

  The anti-vibration grommet is arranged on a mount for attaching the supported member to the supporting member, and suppresses transmission of vibration between the two members.

  For example, in the field of automobiles, anti-vibration grommets are used in mounts for fixing various components such as an electrical unit such as an ECU (Engine Control Unit), an ABS (Antilock Brake System), and an electric water pump to a vehicle. Other fields where anti-vibration grommets are used include, for example, mount units such as compressors and blower fans built into home appliances such as air conditioners and refrigerators, and HDD units installed in office equipment and personal computers. it can.

  FIG. 5 is a perspective view showing an example of a conventional vibration-isolating grommet in a use state. The member on the support side where the vibration isolating grommet 1 is used is, for example, the body 2 of the automobile, and the member on the supported side is, for example, the housing 3 of the electrical unit. The anti-vibration grommet 1 is fixed to the body 2 by bolts 4 and supports the housing 3.

  As shown in FIG. 6, the vibration isolating grommet 1 includes an elastic body 11 having a columnar shape integrally formed of a rubber-like elastic material. The elastic body 11 has the shaft hole 12 penetrated along the axis, and the mounting groove 13 is provided in the center portion of the outer peripheral surface. Therefore, a pair of flexures 14 having a shape like a flange in the axial direction sandwiching the mounting groove 13 are formed.

  In order to mount the anti-vibration grommet 1 on the mounting portion of the housing 3 with respect to the body 2, first, the anti-vibration grommet 1 is inserted into the mounting hole 3 a provided in the housing 3, and the mounting hole 3 a is fitted into the mounting groove 13. Before or after this, the collar 21 is attached to the vibration isolating grommet 1. The collar 21 is a pipe-shaped member having a T-shaped cross section, and is used by inserting a pipe 21 a into the shaft hole 12 of the vibration-proof grommet 1. The direction in which the collar 21 is inserted is a direction in which the portion of the flange 21b faces the body 2 side.

  Thereafter, the vibration isolating grommet 1 is brought into contact with the body 2 via the flange 21b of the collar 21, and the screw hole 2a provided in the body 2 and the shaft hole 12 of the vibration isolating grommet 1 are aligned. Then, the bolt 4 passed through the washer 22 is inserted into the shaft hole 12, and the screw portion 4a of the bolt 4 is screwed into the screw hole 2a and tightened.

  At this time, since the bolt 4 is inserted into the pipe 21 a of the collar 21 inserted into the shaft hole 12, the bolt 4 projects from the body 2 by a distance corresponding to the length of the collar 21 plus the thickness of the washer 22. The amount of protrusion defines the amount of compression of the vibration isolating grommet 1 in the axial direction.

  When vibration occurs between the body 2 of the automobile and the housing 3 of the electrical component unit, the vibration isolating grommet 1 having such a structure is such that the flexible body 14 bends and absorbs the vibration. To reduce vibration transmission.

  For example, as shown in FIG. 7, when an input in the direction of the arrow is applied to the body 2 due to the sinking of the running vehicle, the upper flexure 14 flexes in the axial direction, and the vibration transmitted to the housing 3 of the electrical unit is generated. Absorb.

  An anti-vibration grommet having a configuration similar to the anti-vibration grommet 1 introduced above is also described in, for example, Patent Documents 1 and 2.

JP-A-61-142961 JP-A-10-109551

  In the field of automobiles, vibration is constantly transmitted from the vehicle to the mounts of various components provided with the vibration proof grommets. For this reason, the vibration proof grommet is required to have high durability.

  As described above, the anti-vibration grommet supports components on the support side, for example, bolts to the body of the automobile, and supports components on the support side, such as an ECU, an ABS, and an electric water pump, which are fitted in the mounting grooves. With such a structure, the anti-vibration grommet which continues to receive vibration from the vehicle repeats an operation of coming into contact with and separating from a mating member, that is, a body and a bolt, or a flange and a washer interposed between the body and the bolt. . Therefore, the elastic body of the vibration isolating grommet is gradually deteriorated due to friction between the grommet and the mating member, and may be eventually broken.

  An object of the present invention is to improve the durability of an anti-vibration grommet.

  An anti-vibration grommet according to the present invention includes a columnar elastic body made of a rubber-like elastic material, a hole provided with a shaft hole along an axis of the elastic body, and a circumferentially extending outer circumferential surface of the elastic body. A plurality of mounting grooves provided in the end surface of the elastic body are provided so as to protrude at positions closer to the outer peripheral side than the inner peripheral side, and are in the same plane as the end surface due to deformation when pressed against a counterpart member. And a projection that is positioned.

  Since the projection always contacts the mating member, it is possible to prevent the elastic body from being deteriorated or damaged, and to improve the durability of the vibration isolating grommet.

FIG. 3 is a vertical sectional view showing the vibration-isolating grommet in a used state as one embodiment. FIG. 3 is a perspective view of a vibration-isolating grommet before use. FIG. 4 is a vertical sectional view of the vibration-isolating grommet before use. FIG. 4 is a vertical sectional view showing the vibration-isolating grommet in a used state with bolts omitted. FIG. 4 is a vertical cross-sectional view showing a vibration-isolating grommet in a used state as an example of the related art. FIG. 6 is a perspective view of an anti-vibration grommet illustrated in FIG. 5. FIG. 6 is a vertical cross-sectional view showing a state when the vibration isolating grommet shown in FIG. 5 is deformed.

  An embodiment will be described with reference to FIGS.

  This embodiment is an example of an anti-vibration grommet used for a mount for attaching an electrical unit to an automobile body. The anti-vibration grommet 101 has a structure capable of maintaining a state of contact with a mating member located on the mount portion even when vibration is transmitted from the body. With this structure, the anti-vibration grommet 101 is less susceptible to deterioration and damage due to repeated operations of coming into contact with and separating from the partner member, thereby obtaining high durability.

  FIG. 1 is a vertical sectional view showing the vibration isolating grommet 101 in a used state. In FIG. 1, the member on the supporting side is the body 201 of the automobile, and the member on the supported side is the housing 301 of the electrical unit.

  However, this is only one example, and the anti-vibration grommet 101 of the present embodiment is, for example, an ABS mounted on a car, an electric water pump, a small motor, a compressor built in a home appliance such as an air conditioner or a refrigerator. The present invention can be applied to various mounting units for attaching a supported member to a supporting member, such as a fan unit, a blower fan, an HDD unit mounted on office equipment or a personal computer (all not shown). What is to be the supporting-side member and what is to be the supported-side member is appropriately determined according to the type of the mounting portion in which the vibration-proof grommet 101 is used.

  As shown in FIG. 1, the vibration isolating grommet 101 includes an elastic body 111 as a base, is fixed to the body 201 by a bolt 151, and supports a housing 301 of the electrical unit at a central portion of the elastic body 111. The elastic body 111 is formed of a rubber-like elastic material.

  The elastic body 111 has a columnar shape, and has a hole 113 through which a circular shaft hole 112 passes along the axis. On the outer peripheral surface of the elastic body 111, a mounting groove 114 is provided at the center along the circumference. Therefore, the elastic body 111 has a shape in which a pair of flexible bodies 115 are arranged in the axial direction with the mounting groove 114 interposed therebetween. These flexures 115 have the same shape and the same size as each other, and are arranged vertically with the central axis coincident with the axis of the elastic body 111.

  As shown in FIGS. 2 and 3, a plurality of protrusions 116 are provided on two end surfaces 111 a of the elastic body 111. A plurality of these protrusions 116 are provided in the end surface 111a of the elastic body 111 at positions closer to the outer periphery than to the inner periphery. More specifically, the plurality of protrusions 116 have an arcuate shape slightly concentric with the elastic body 111 from the virtual surface including the outer peripheral surface 111b of the elastic body 111 and arranged concentrically with the elastic body 111. ing. Six protrusions 116 are arranged at equal intervals on each of the two end faces 111a of the elastic body 111. These projections 116 have an arc-shaped tip shape in cross section.

  As described above, in the vibration-isolating grommet 101, the elastic body 111 is formed of a rubber-like elastic material. For this reason, the pair of flexures 115 received an axial force such that the two end surfaces 111a were sandwiched between the mating members (a flange 401b and a washer 402 of a collar 401 described later in FIGS. 1 and 2 in this example). At this time, it is elastically deformed and flexes in the axial direction. At this time, the protrusion 116 is pressed against the partner member and deforms so as to be crushed. The deformed protrusion 116 is positioned on the same plane as the end face 111a. In other words, when the protrusion 116 is sandwiched between the pair of mating members and crushed, the protrusions 116 are positioned in the same plane as the end surface 111a so that the end surface 111a comes into close contact with the mating member. Such a configuration of the protrusion 116 can be realized by the amount of protrusion from the end face 111a, the volume of each protrusion 116, the composition of the rubber-like elastic material that is the material, and the like.

  As shown in FIGS. 1 and 4, the anti-vibration grommet 101 is mounted on a mount portion of the housing 301 with respect to the body 201 in a state where the collar 401 and the washer 402 are mounted. The collar 401 has a T-shaped cross section having a pipe 401a that can be inserted into the shaft hole 112 of the vibration-isolating grommet 101 and into which the screw portion 151a of the bolt 151 can be inserted, and a flange 401b fixed to an end of the pipe 401a. It is a pipe-shaped member. The washer 402 is a flat washer having a hole diameter into which the screw portion 151a of the bolt 151 is inserted and which is abutted against the end face of the pipe 401a of the collar 401.

  The anti-vibration grommet 101 is mounted on a mount portion of the housing 301 with respect to the body 201 by tightening a bolt 151 having a screw portion 151a screwed into a screw hole 201a provided in the body 201. At this time, the vibration-proof grommet 101 is attached between the flange 401b of the collar 401 and the washer 402 by compressing the pair of flexible members 115 in the axial direction. The amount of compression of the pair of flexures 115 is determined by the length of the pipe 401a of the collar 401, that is, the distance between the flange 401b and the washer 402.

  The amount of compression of the pair of flexures 115 determined in this way determines the pressure for compressing the elastic body 111 in the axial direction as a prescribed pressure. When the elastic body 111 is compressed in the axial direction at a specified pressure, the protrusion 116 crushed by the pair of mating members (the flange 401b of the collar 401 and the washer 402) is positioned in the same plane as the end face 111a. The end face 111a is brought into close contact with the mating member.

  In such a configuration, in order to mount the anti-vibration grommet 101 on the mounting portion of the housing 301 of the transmission unit with respect to the body 201 of the automobile, first, the anti-vibration grommet 101 is inserted into the mounting hole 301a provided in the housing 301, and the mounting is performed. The mounting hole 301a is fitted into the groove 114. Before or after this, the collar 401 is attached to the anti-vibration grommet 101. The insertion direction of the collar 401 at this time is a direction in which the flange 401b faces the body 201 side.

  Thereafter, the vibration isolating grommet 101 is brought into contact with the body 201 via the flange 401b of the collar 401, and the screw hole 201a provided in the body 201 and the shaft hole 112 of the vibration isolating grommet 101 are aligned. Then, the bolt 151 having passed through the washer 402 is inserted into the shaft hole 112, and the screw portion 151a of the bolt 151 is screwed into the screw hole 201a and tightened. Thus, the housing 301 of the transmission unit is mounted on the body 201 of the automobile via the anti-vibration grommet 101.

  When vibration occurs between the body 201 of the automobile and the housing 301 of the electrical unit, the flexible body 115 of the vibration isolating grommet 101 bends to absorb the vibration, and reduces the transmission of the vibration between the body 201 and the housing 301. I do. For example, when the body 201 sinks, the body 201 is displaced in a direction away from the housing 301, so that the upper flexure 115 flexes in the axial direction to absorb vibration. Conversely, when the body 201 is pushed up, the body 201 is displaced in a direction approaching the housing 301, so that the lower flexure 115 is flexed in the axial direction to absorb vibration.

  The elastic body 111 of the anti-vibration grommet 101 has the two end faces 111a entirely in close contact with the mating member (the flange 401b of the collar 401 and the washer 402). This is because the protrusions 116 are crushed by the tightening of the bolts 151 and are positioned in the same plane as the end surface 111a. As a result, the posture of the anti-vibration grommet 101 is stabilized, and when absorbing the vibration transmitted from the body 201 of the vehicle to the electrical component unit, a favorable vibration absorbing effect by bending the pair of flexures 115 is exhibited.

  The problem with the conventional vibration-isolating grommet is that the end face of the elastic body repeats the operation of coming into contact with or separating from the counterpart member under vibration from the vehicle. By repeating this operation, the end surface of the elastic body gradually deteriorates due to friction between the elastic member and the mating member, and may eventually break.

  The anti-vibration grommet 101 of the present embodiment receives vibration from the body 201 of the automobile, and even if the end face 111a of the elastic body 111 is separated from the counterpart member, the protrusion 116 that has been crushed and elastically deformed has Restores its shape and does not separate from the mating member. Therefore, when the end surface 111a of the elastic body 111 once separated from the counterpart member comes into contact with the counterpart member again, sliding does not occur between the two. As a result, the elastic body 111 does not suffer from deterioration due to friction between the elastic body 111 and the mating member, and is free from damage caused by deterioration due to wear. Therefore, according to the present embodiment, the durability of the vibration-proof grommet 101 can be improved.

  The protrusion 116 provided on the end surface 111a of the elastic body 111 is not provided over the entire circumference in the circumferential direction, but is divided into a plurality. Therefore, the compression force and the spring characteristics of the entire vibration-isolating grommet 101 can be adjusted by appropriately setting the number, the peripheral length, and the like of the protrusions 116.

  According to the present embodiment, the protrusions 116 are arranged at equal intervals on a concentric circle of the elastic body 111. For this reason, it is possible to maintain a stable close contact state with the counterpart member, and to more reliably prevent sliding between the two when the end surface 111a of the elastic body 111 once separated from the counterpart member comes into contact with the counterpart member again. Can be.

  According to the present embodiment, protrusions 116 are provided on two end surfaces 111 a of elastic body 111. For this reason, by using a mount portion that causes each of the two flexible members 115 to have a vibration absorbing action, for example, a mount portion as in the present embodiment, any of the two end surfaces 111a is caused by friction between the two end surfaces 111a and a mating member. Deterioration can be prevented, and the anti-vibration grommet 101 can be protected from damage caused by deterioration due to wear.

  Upon implementation, various modifications and changes are allowed.

  For example, in the present embodiment, an example in which the protrusions 116 are provided on the two end faces 111a of the elastic body 111 has been described. However, this is not essential, and the protrusions are provided only on one end face 111a side of the elastic body 111. 116 may be provided. In particular, when the vibration should be absorbed in only one direction, it is sufficient to provide the protrusion 116 only on one end face 111a side of the elastic body 111.

  In the present embodiment, an example in which six protrusions 116 are provided for one end face 111a has been described, but the number of protrusions 116 is not limited to six, and may be smaller or larger.

  The arrangement position, protrusion amount, shape, volume, and the like of the protrusion 116 are not limited to the present embodiment. The protrusion 116 may be disposed at a position closer to the outer peripheral side than the inner peripheral side of the elastic body 111, and as long as the protrusion 116 is positioned in the same plane as the end face 111a by deformation when pressed against a counterpart member, the embodiment is not limited thereto. It is possible to provide the protrusion 116 with various protrusion amounts, various shapes, specific volumes, and the like different from the above.

  In the present embodiment, an example is shown in which the flange 401b of the collar 401 and the washer 402 are mating members, but the embodiment is not limited to this. The mating member with which the end face 111a of the vibration isolating grommet 101 comes into close contact may be fitted with the body 201 of the automobile, the head of the bolt 151, or the like.

  In addition, any modifications and changes are allowed.

101 Vibration-proof grommet 111 Elastic body 111a End face 111b Outer peripheral face 112 Shaft hole 113 Hole 114 Mounting groove 115 Flexible body 116 Projection 151 Bolt 151a Screw part 201 Body 201a Screw hole 301 Housing 301a Mounting hole 401 Collar 401a Pipe 401b Flange 402 Washer

Claims (3)

A columnar elastic body made of rubber-like elastic material;
A hole for providing a shaft hole along the axis of the elastic body,
A mounting groove provided on the outer peripheral surface of the elastic body along the circumference,
In the end surface of the elastic body, a plurality of protrusions are provided to protrude at a position closer to the outer peripheral side than the inner peripheral side, and a protrusion positioned in the same plane as the end surface by deformation when pressed against a counterpart member,
A vibration isolating grommet comprising: The protrusions are arranged at equal intervals on concentric circles of the elastic body,
The anti-vibration grommet according to claim 1, wherein: The protrusion is provided on two end surfaces of the elastic body,
The anti-vibration grommet according to claim 1 or 2, wherein:

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