Anti-vibration mounts and anti-vibration structures

Abstract

To suppress the transmission of the vibration of a low-frequency region.SOLUTION: An antivibration mount 100 for use in the connection of a support body 10 and an attachment part 24 inserted with a shaft part 32 of a screw 30 which is connected to the support body 10 comprises: an annular main body part 120 including a first portion PT1 which is fit into an annular groove GR formed at an end face EF10 of the attachment part 24, and inserted with the shaft part 32; and a washer 140 arranged between either of a head part 34 of the screw 30 and the support body 10 and the main body part 120, including a face SF2 contacting with either of the head part 34 of the screw 30 and the support body 10, and a face SF1 contacting with the main body part 120, and inserted with the shaft part 32. The main body part 120 is formed of a first material, and the washer 140 is formed of a second material which is higher than the first material in elasticity.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an anti-vibration mount and an anti-vibration structure. [Background technology]

[0002] Conventionally, when an automobile part such as a compressor is fixed to a vehicle, a vibration-isolating member such as a vibration-isolating mount is used to suppress the transmission of vibration generated from either the vehicle or the automobile part to the other of the vehicle and the automobile part. For example, Patent Document 1 discloses an on-vehicle electric compressor having a vibration-isolating member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-46666 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for anti-vibration mounts that suppress the transmission of vibrations in the low-frequency range.

[0005] In consideration of the above circumstances, an object of the present invention is to suppress the transmission of vibrations in the low-frequency range. [Means for solving the problem]

[0006] In order to solve the above problems, one form of the present invention provides an anti-vibration mount used to connect a first member to a second member through which a shaft portion of a fastening member connected to the first member is inserted, and comprises: an annular main body portion including an edge portion that fits into an annular groove provided on an end face of the second member and through which the shaft portion is inserted; and an auxiliary portion that is arranged between one of a head of the fastening member and the first member and the main body portion, and includes a surface that contacts the one of the fastening member and a surface that contacts the main body portion, and through which the shaft portion is inserted, wherein the main body portion is formed of a first material, and the auxiliary portion is formed of a second material having a greater elastic modulus than the first material.

[0007] Furthermore, a vibration-proof structure according to one embodiment of the present invention comprises two vibration-proof mounts of the above-described form, one of the two vibration-proof mounts being positioned between the head of the fastening member and the second member, and the other of the two vibration-proof mounts being positioned between the first member and the second member. [Brief description of the drawings]

[0008] [Figure 1] 1 is an explanatory diagram for explaining an overview of an anti-vibration mount according to an embodiment. FIG. [Diagram 2] 2 is a cross-sectional perspective view showing an example of the configuration of the vibration-proof mount shown in FIG. 1. [Diagram 3] 5A to 5C are explanatory diagrams for explaining the operation of the vibration-proof mount. [Figure 4] FIG. 11 is an explanatory diagram for explaining the outline of a vibration-proof mount according to a first comparative example. [Diagram 5] 11A and 11B are explanatory diagrams for explaining the function of a protrusion of the vibration-proof mount. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments of the present invention will be described with reference to the drawings. However, in each drawing, the dimensions and scale of each part are appropriately different from the actual ones. In addition, since the embodiments described below are preferred specific examples of the present invention, various technically preferable limitations are attached, but the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description to the effect that the present invention is limited.

[0010] [1. Embodiment] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to FIG.

[0011] FIG. 1 is an explanatory diagram for explaining an overview of an anti-vibration mount 100 according to an embodiment.

[0012] The vibration-proof mount 100 is used to connect a support 10 such as an engine to a housing 20, and suppresses the transmission of vibrations generated in one of the support 10 and the housing 20 to the other. The support 10 is an example of a "first member". The housing 20 has a housing body 22 that houses an automobile part such as a compressor, and four mounting parts 24 that are fixed to the housing body 22 and through which the shanks 32 of the screws 30 are inserted. The mounting parts 24 are an example of a "second member". Note that the number of mounting parts 24 provided on the housing body 22 is not limited to four. The screws 30 are an example of a "fastening member". For example, in FIG. 1, a part of the shanks 32 of the screws 30 is omitted in order to make the drawing easier to see.

[0013] In the example shown in FIG. 1, each mounting portion 24 extends in the extension direction of the shaft portion 32 of the screw 30. The shaft portion 32 of the screw 30 is inserted into each mounting portion 24. For example, the shaft portion 32 of the screw 30 passes through two anti-vibration mounts 100 that sandwich the mounting portion 24 in the extension direction of the shaft portion 32 of the screw 30 and the mounting portion 24 sandwiched between the two anti-vibration mounts 100, and is connected to an axial hole HL10 provided in the support body 10. As a result, the mounting portion 24 is connected to the support body 10, and the housing 20 is fixed to the support body 10. Hereinafter, the extension direction of the shaft portion 32 is also referred to as the axial direction.

[0014] A structure having two anti-vibration mounts 100 sandwiching the mounting portion 24 is an example of an "anti-vibration structure." That is, one of the two anti-vibration mounts 100 sandwiching the mounting portion 24 is an example of a "first anti-vibration mount," and the other of the two anti-vibration mounts 100 is an example of a "second anti-vibration mount." For example, one of the two anti-vibration mounts 100 sandwiching the mounting portion 24 is disposed between the head 34 of the screw 30 and the mounting portion 24, and the other of the two anti-vibration mounts 100 is disposed between the support 10 and the mounting portion 24. Next, an example of the configuration of the anti-vibration mount 100 will be described with reference to FIG. 2.

[0015] Fig. 2 is a cross-sectional perspective view showing an example of the configuration of the anti-vibration mount 100 shown in Fig. 1. Fig. 2 shows a schematic cross-sectional perspective view of the anti-vibration mount 100, the support 10, and the attachment portion 24 cut along a plane passing through the axis AX of the shaft portion 32 of the screw 30 with the attachment portion 24 connected to the support 10. In order to make the configuration of the anti-vibration mount 100 easier to understand, Fig. 2 also shows enlarged views of the end of the attachment portion 24, the main body portion 120, and the washer 140 of the anti-vibration mount 100.

[0016] In addition, in FIG. 2, in order to distinguish the two anti-vibration mounts 100 sandwiching the mounting part 24 from each other, the reference numerals of the anti-vibration mounts 100 are suffixed with a lowercase alphabet (a or b). For example, the reference numerals of the anti-vibration mounts 100 disposed between the head 34 of the screw 30 and the mounting part 24 are suffixed with "a," and the reference numerals of the anti-vibration mounts 100 disposed between the support 10 and the mounting part 24 are suffixed with "b." The anti-vibration mount 100a is an example of a "first anti-vibration mount," and the anti-vibration mount 100b is an example of a "second anti-vibration mount." The configuration of the anti-vibration mount 100b is similar to that of the anti-vibration mount 100a, so in FIG. 2, the anti-vibration mount 100a will be mainly described. In FIG. 2 and subsequent figures, the anti-vibration mounts 100a and 100b may be referred to as anti-vibration mounts 100 without any particular distinction.

[0017] First, an overview of the mounting portion 24 sandwiched between the anti-vibration mounts 100a and 100b will be described. For example, the mounting portion 24 is formed with an axial hole HL20 through which the collar 26 is inserted. The collar 26 is formed in a cylindrical shape from a metal material so that the shank 32 of the screw 30 is inserted. That is, the collar 26 through which the shank 32 of the screw 30 is inserted is inserted into the mounting portion 24. The collar 26 is an example of a "tubular portion." The shank 32 of the screw 30 is inserted into the mounting portion 24 by inserting it through the collar 26 inserted into the axial hole HL20 of the mounting portion 24. The diameter of the axial hole HL20 (the inner diameter of the mounting portion 24) is, for example, larger than the outer diameter of the collar 26. For example, the diameter of the axial hole HL20 may be a size that ensures a predetermined gap between the outer peripheral surface of the collar 26 and the inner peripheral surface of the mounting portion 24 when the collar 26 is inserted into the axial hole HL20.

[0018] The mounting portion 24 is understood to have an annular shape when viewed in a planar view from the axial direction (extension direction of the shaft portion 32). Here, "planar view" refers to observing an object from a specific direction. In addition, in this embodiment, "annular" refers to a shape obtained by removing another closed area that exists inside one closed area when viewed in a planar view. Also, a "closed area" is, for example, an area surrounded by one or both of curves and line segments. In other words, "annular" refers to a shape composed of straight lines or curves that loop so as to enclose a space.

[0019] The mounting portion 24 also has, for example, first annular portions LP1a and LP1b which are end portions in the axial direction, and a second annular portion LP2 which is a portion between the first annular portions LP1a and LP1b. The first annular portions LP1a and LP1b have the same configuration. Hereinafter, the first annular portions LP1a and LP1b are also referred to as the first annular portion LP1 without any particular distinction.

[0020] Each of the first annular portions LP1a and LP1b includes, for example, an annular first wall portion W1 and an annular second wall portion W2 surrounding the first wall portion W1. That is, the first wall portion W1 is provided at a position separated from the second wall portion W2 in a space surrounded by the second wall portion W2. For example, the first wall portion W1 is an annular portion protruding in the axial direction from an inner peripheral edge of the end face EF20 of the second annular portion LP2, and the second wall portion W2 is an annular portion protruding in the axial direction from an outer peripheral edge of the end face EF20 of the second annular portion LP2.

[0021] In the example shown in FIG. 2, the inner peripheral surface of the first wall W1 constitutes a part of the inner peripheral surface INP2 of the mounting portion 24, and the outer peripheral surface of the second wall W2 constitutes a part of the outer peripheral surface OUP2 of the mounting portion 24. The upper surface EF11 of the first wall W1 and the upper surface EF12 of the second wall W2 are located in the same plane and constitute the end surface EF10 of the mounting portion 24. Note that, "plurality of surfaces located in the same plane" means that the plurality of surfaces are parallel to each other and that the positions on the coordinate axis perpendicular to the plurality of surfaces are the same for the plurality of surfaces. However, "parallel" does not only mean strictly parallel, but also includes substantially parallel (for example, parallel within a margin of error). Furthermore, "same" does not only mean strictly same, but also includes substantially same (for example, the difference in the positions of the plurality of surfaces is within a margin of error).

[0022] The first wall W1 and the second wall W2 form an annular groove GR in the first annular portion LP1. For example, the groove GR corresponds to a space defined by the outer peripheral surface WS1 of the first wall W1, the inner peripheral surface WS2 of the second wall W2, and the end face EF20 of the second annular portion LP2. That is, the outer peripheral surface WS1 of the first wall W1 and the inner peripheral surface WS2 of the second wall W2 correspond to the side surface of the groove GR, and the portion of the end face EF20 of the second annular portion LP2 between the first wall W1 and the second wall W2 corresponds to the bottom surface of the groove GR. In this manner, the annular groove GR is formed in the first annular portion LP1. That is, the annular groove GR is provided in the end face EF10 of the mounting portion 24. The first portion PT1 of the main body 120 included in the vibration-proof mount 100 described later is fitted into the annular groove GR provided in the end face EF10 of the mounting portion 24.

[0023] The vibration-proof mount 100 has a main body 120 formed of an elastic material, and a washer 140 formed of a material having a higher elastic modulus than the material of the main body 120. The material having a higher elastic modulus than the material of the main body 120 (elastic material) may be, for example, a metal material or a resin material. In this embodiment, it is assumed that the washer 140 is formed of a metal material. Note that the elastic material is an example of a "first material", and the material having a higher elastic modulus than the material of the main body 120 is an example of a "second material". The main body 120 is an example of a "main body", and the washer 140 is an example of an "auxiliary part". Furthermore, the main body 120 included in the vibration-proof mount 100a is an example of a "first main body", and the washer 140 included in the vibration-proof mount 100a is an example of a "first auxiliary part". The main body portion 120 included in the vibration-proof mount 100b is an example of a "second main body portion", and the washer 140 included in the vibration-proof mount 100b is an example of a "second auxiliary portion".

[0024] The main body 120 is understood to have an annular shape when viewed from the axial direction. For example, the main body 120 is formed in an annular shape so as to surround the shaft portion 32 of the screw 30. As a result, the main body 120 is formed with an axial hole HL1 through which the shaft portion 32 of the screw 30 is inserted. The main body 120 also includes a first portion PT1 that is fitted into an annular groove GR provided on one end face EF10 of the mounting portion 24, and a second portion PT2 in which an annular protrusion PP is formed. For example, the first portion PT1 of the main body 120 included in the anti-vibration mount 100a is fitted into an annular groove GR provided on an end face EF10 of the first annular portion LP1a of the mounting portion 24. The first portion PT1 of the main body 120 included in the anti-vibration mount 100b is fitted into an annular groove GR provided on an end face EF10 of the first annular portion LP1b of the mounting portion 24. The first portion PT1 is an example of an "edge portion that is fitted into an annular groove".

[0025] The second portion PT2 is a portion of the main body 120 located between the end face EF10 of the attachment portion 24 and the washer 140 (more specifically, the bottom portion BT described below). Therefore, the inner circumferential surface of the second portion PT2 constitutes a part of the inner circumferential surface INP1 of the main body 120. The second portion PT2 includes an annular protrusion PP that protrudes from the inner circumferential surface INP1 toward the shaft portion 32 of the screw 30. Specifically, the protrusion PP is formed in an annular shape that continues in the circumferential direction around the entire circumference of the inner circumferential surface INP1 of the second portion PT2. The protrusion PP is formed integrally with the second portion PT2.

[0026] The washer 140 is disposed between one of the head 34 of the screw 30 and the support 10 and the body portion 120. For example, the washer 140 included in the anti-vibration mount 100a is disposed between the head 34 of the screw 30 and the body portion 120, and the washer 140 included in the anti-vibration mount 100b is disposed between the support 10 and the body portion 120.

[0027] The washer 140 is understood to have an annular shape when viewed from the axial direction. For example, the washer 140 includes a bottom portion BT in which an axial hole HL2 is formed, and an annular side wall portion SW that protrudes from the edge of the bottom portion BT toward the mounting portion 24 and faces the outer circumferential surface OUP1 of the main body portion 120. The shaft portion 32 of the screw 30 is inserted through the axial hole HL2 formed in the bottom portion BT. The side wall portion SW is formed in a ring shape that continues in the circumferential direction around the entire outer edge of the surface SF1, which faces the end surface EF2 of the main body portion 120, out of the two surfaces SF1 and SF2 of the bottom portion BT. That is, the side wall portion SW is formed in a ring shape so as to surround the shaft portion 32 of the screw 30. In addition, in the initial state when the vibration-proof mount 100 is attached to the mounting portion 24, it is preferable that a predetermined gap be secured between the inner surface of the side wall portion SW and the outer peripheral surface OUP1 of the main body portion 120, but the inner surface of the side wall portion SW may be in contact with the outer peripheral surface OUP1 of the main body portion 120.

[0028] An inner diameter D2 (diameter of the axial hole HL2) of the bottom part BT of the washer 140 is, for example, larger than the outer diameter of the collar 26 and smaller than the inner diameter D1 (diameter of the axial hole HL1) of the main body part 120 and the inner diameter Dpp of the annular protrusion part PP. For example, the inner diameter D2 of the bottom part BT may be large enough that the outer periphery of the collar 26 comes into contact with the inner periphery of the bottom part BT when the collar 26 is inserted into the axial hole HL2.

[0029] The face SF1 of the bottom part BT contacts the end face EF2 of the main body part 120, and the face SF2 opposite to the face SF1 of the bottom part BT contacts one of the head 34 of the screw 30 and the support body 10. For example, in the washer 140 included in the anti-vibration mount 100a, the face SF2 of the bottom part BT contacts the head 34 of the screw 30. Also, in the washer 140 included in the anti-vibration mount 100b, the face SF2 of the bottom part BT contacts the support body 10.

[0030] Thus, the anti-vibration mount 100 has a main body 120 and a washer 140 through which the shaft 32 of the screw 30 is inserted. The anti-vibration mounts 100a and 100b are disposed, for example, between the head 34 of the screw 30 and the mounting part 24, and between the support 10 and the mounting part 24, so that the main body 120 is compressed in the axial direction. Since the main body 120 is compressed in the axial direction, an axial force is applied to the washer 140 and the mounting part 24 by an elastic force FE that tries to return the main body 120 to its original state. That is, a force is applied to the washer 140 and the mounting part 24 to move them in a direction away from each other. Note that the movement of the washer 140 included in the anti-vibration mount 100a in a direction away from the mounting part 24 is restricted by the head 34 of the screw 30. Also, the movement of the washer 140 included in the anti-vibration mount 100b in a direction away from the mounting part 24 is restricted by the support 10.

[0031] As a result, a frictional force corresponding to an elastic force FE that causes the main body 120 to return to its original state is generated between the end face EF1 of the main body 120 and the end face EF20 (bottom face of the groove GR) of the second annular portion LP2, and between the end face EF2 of the main body 120 and the face SF1 of the washer 140. For example, as shown in FIG. 3, the mounting portion 24 is supported between the washers 140 of the vibration-proof mounts 100a and 100b by the frictional force FF generated between the main body 120 and the washer 140 and the frictional force FF generated between the main body 120 and the mounting portion 24. That is, the mounting portion 24 is fixed to the support 10 via the vibration-proof mounts 100a and 100b. Next, referring to FIG. 3, an operation in the case where the mounting portion 24 is fixed to the support 10 using the vibration-proof mount 100 will be described.

[0032] Fig. 3 is an explanatory diagram for explaining the operation of the anti-vibration mount 100. Fig. 3 shows a schematic cross-sectional view of the anti-vibration mount 100 and the mounting portion 24, cut along a plane passing through the axis AX, with the mounting portion 24 fixed to the support 10. In Fig. 3, it is assumed that a force FIN, as indicated by the outlined arrow, is generated in the radial direction of the main body portion 120 in the mounting portion 24.

[0033] For example, when a force FIN due to vibration of the mounting portion 24 is generated on the main body portion 120, a friction force FF that prevents the position of the main body portion 120 from changing relative to the mounting portion 24 is generated between the main body portion 120 and the mounting portion 24. Similarly, a friction force FF that prevents the position of the main body portion 120 from changing relative to the washer 140 is generated between the main body portion 120 and the washer 140. For this reason, for example, the end face EF1 of the main body portion 120 moves together with the mounting portion 24 in the same direction as the direction of the force FIN. Therefore, a shear force FSH acts on the main body portion 120 in the shear direction (direction parallel to the end face EF1). The main body portion 120 is deformed in the shear direction by the shear force FSH. Hereinafter, the deformation in the shear direction is also referred to as shear deformation. Hereinafter, deformation in which an elastic body is compressed may be referred to as compression deformation in contrast to shear deformation.

[0034] The transmission of the force FIN generated in the mounting portion 24 to the washer 140 is suppressed by the shear deformation of the main body portion 120. That is, in this embodiment, the transmission of the force FIN generated in the mounting portion 24 to the support body 10 via the washer 140 or the like can be suppressed by the shear deformation of the main body portion 120.

[0035] Here, in an elastic body such as rubber, the rigidity (degree of difficulty in deformation) against a force that shears and deforms the elastic body is lower than the rigidity against a force that compresses the elastic body. Therefore, in this embodiment, the rigidity of the main body 120 can be made lower than that of the first comparative example (for example, the anti-vibration mount 100ex shown in FIG. 4 described later) that suppresses the force FIN generated in the attachment part 24 from being transmitted to the support body 10 by compressively deforming the main body 120.

[0036] When the rigidity of the main body 120 is low, the transmission of low-frequency vibrations can be more efficiently suppressed than when the rigidity of the main body 120 is high. That is, in this embodiment, the transmission of low-frequency vibrations can be more efficiently suppressed than in the above-described first comparative example, and the frequency range in which the effect of suppressing the transmission of vibrations can be obtained can be wider.

[0037] Furthermore, in the anti-vibration mount 100 of this embodiment, the first portion PT1 of the main body 120 is fitted into a groove GR formed in the attachment portion 24. For this reason, in this embodiment, even if the elastic force FE of the main body 120 decreases due to long-term use of the anti-vibration mount 100, the attachment portion 24 is supported by the first portion PT1 fitted into the groove GR. That is, in this embodiment, even if the anti-vibration mount 100 has been used for a long period of time, the support function of the anti-vibration mount 100 to support the attachment portion 24 is ensured. As a result, in this embodiment, the support function of the anti-vibration mount 100 can be ensured for a long period of time, compared to a configuration in which the first portion PT1 of the main body 120 is not fitted into the groove GR (a configuration in which the groove GR is not formed in the attachment portion 24).

[0038] Moreover, in this embodiment, the washer 140 includes an annular side wall portion SW that protrudes from the edge of the bottom portion BT toward the mounting portion 24 and faces the outer circumferential surface OUP1 of the main body portion 120. For this reason, in this embodiment, even if the elastic force FE of the main body portion 120 decreases due to long-term use of the vibration-proof mount 100, for example, the shear deformation of the second portion PT2 is limited by the side wall portion SW. As a result, in this embodiment, the mounting portion 24 is supported by the second portion PT2 and the side wall portion SW, for example, even if the vibration-proof mount 100 has been used for a long period of time. For this reason, in this embodiment, the support function of the vibration-proof mount 100 can be ensured for a long period of time, compared to a configuration in which the side wall portion SW is omitted from the washer 140 (a configuration in which the annular side wall portion SW is not formed).

[0039] Next, as a form to be compared with the above-described embodiment, a first comparative example in which the transmission of the force FIN generated at the mounting portion 24 to the support body 10 is suppressed by compressive deformation of an elastic body will be described with reference to FIG. 4.

[0040] Fig. 4 is an explanatory diagram for explaining an overview of the vibration-proof mount 100ex according to the first comparative example. Fig. 4 shows a schematic cross-sectional view of the vibration-proof mount 100ex, the support 10, and the attachment part 24ex, cut along a plane passing through the axis AX, in a state in which the attachment part 24ex is connected to the support 10.

[0041] The anti-vibration mount 100ex is formed in a ring shape from an elastic material, for example, without including the washer 140. For example, the anti-vibration mount 100ex is inserted into the axial hole HL20ex of the attachment portion 24ex so that the entire inner circumferential surface of the anti-vibration mount 100ex contacts the outer circumferential surface of the collar 26ex that passes through the axial hole HL20ex of the attachment portion 24ex.

[0042] In FIG. 4, as in FIG. 3, it is assumed that a force FIN as indicated by a hollow arrow is generated in the attachment portion 24ex in the radial direction of the anti-vibration mount 100ex. In this case, a force FCM that compresses the anti-vibration mount 100ex in the radial direction acts on the anti-vibration mount 100ex. Therefore, the anti-vibration mount 100ex is compressed and deformed in the radial direction by the force FCM. The transmission of the force FIN generated in the attachment portion 24ex to the collar 26ex is suppressed by the anti-vibration mount 100ex compressing and deforming in the radial direction. That is, in the first comparative example, the transmission of the force FIN generated in the attachment portion 24ex to the support body 10 can be suppressed by the anti-vibration mount 100ex compressing and deforming in the radial direction.

[0043] In the first comparative example, the vibration-proof mount 100ex is compressed and deformed in the radial direction by the force FIN, and therefore has a higher rigidity against the force FIN than the vibration-proof mount 100 (the present embodiment) in which the main body 120 is shear-deformed by the force FIN. In other words, the vibration-proof mount 100 of the present embodiment can have a lower rigidity against the radial force FIN than the vibration-proof mount 100ex of the first comparative example. As a result, as described in FIG. 3, the vibration-proof mount 100 of the present embodiment can efficiently suppress the transmission of low-frequency vibrations, and can widen the frequency range in which the effect of suppressing the transmission of vibrations can be obtained, compared to the vibration-proof mount 100ex of the first comparative example. Next, the function of the protruding portion PP of the vibration-proof mount 100 will be described with reference to FIG. 5.

[0044] Fig. 5 is an explanatory diagram for explaining the function of the protrusion PP of the anti-vibration mount 100. Fig. 5 shows a schematic cross-sectional view of the main body 120 and collar 26 of the anti-vibration mount 100 cut along a plane passing through the axis AX shown in Fig. 3. Fig. 5 also shows the change over time in the state of the main body 120 relative to the collar 26. For example, time T indicates the elapsed time from the time when the anti-vibration mount 100 was attached to the attachment part 24.

[0045] State ST0 indicates the initial state of the main body portion 120 when the main body portion 120 is attached to the attachment portion 24 so as to surround the collar 26. In state ST0 (initial state), the protrusion portion PP of the main body portion 120 does not contact the collar 26 (more specifically, the outer peripheral surface of the collar 26).

[0046] State ST1 shows the state of the main body 120 when the elastic force FE of the main body 120 is reduced compared to state ST0 as a result of the anti-vibration mount 100 being used continuously from state ST0. In state ST1, the tip of the protrusion PP of the main body 120 contacts the collar 26.

[0047] State ST2 shows the state of the main body 120 when the anti-vibration mount 100 has been used for a period of time longer than the period of use corresponding to state ST1. In state ST2, the protrusion PP of the main body 120 is in contact with the collar 26. The contact area between the protrusion PP and the collar 26 in state ST2 is larger than the contact area between the protrusion PP and the collar 26 in state ST1. For example, in state ST2, the protrusion PP of the main body 120 is compressed by contacting the collar 26. Therefore, the height H2 of the protrusion PP in state ST2 is smaller than the height H1 of the protrusion PP in state ST1.

[0048] Thus, in this embodiment, when the elastic force FE of the main body 120 decreases due to long-term use of the vibration-proof mount 100, the increase in the contact area between the protrusion PP and the collar 26 over the period of use can be made slower.

[0049] Here, as a form to be contrasted with the present embodiment in which the annular protrusion PP is formed on the second portion PT2, a form in which the protrusion PP is not formed on the second portion PT2 (hereinafter also referred to as the second comparative example) will be considered. For example, in the second comparative example, due to a decrease in the elastic force FE of the main body portion 120, at the stage where the inner peripheral surface INP1 of the main body portion 120 starts to contact the collar 26 (the stage corresponding to the state ST1), there is a risk that almost the entire inner peripheral surface INP1 of the second portion PT2 will contact the collar 26. In this case, almost the entire inner peripheral surface INP1 of the second portion PT2 receives a reaction force from the collar 26. That is, in the second comparative example, when the main body portion 120 contacts the collar 26 due to a long-term use of the vibration-proof mount 100, there is a risk that the rise in the reaction force that the vibration-proof mount 100 receives from the collar 26 will become steep.

[0050] In contrast, in this embodiment, even if the elastic force FE of the main body 120 decreases due to long-term use of the anti-vibration mount 100, the main body 120 gently contacts the collar 26 via the protruding portion PP. As a result, in this embodiment, when the main body 120 contacts the collar 26 due to long-term use of the anti-vibration mount 100, it is possible to prevent the reaction force that the anti-vibration mount 100 receives from the collar 26 from rising sharply. As a result, in this embodiment, it is possible to prevent the anti-vibration mount 100 from receiving a sudden reaction force from the collar 26, and therefore it is possible to prevent the reaction force from the collar 26 from being transmitted to the attachment portion 24.

[0051] As described above, in this embodiment, the vibration-proof mount 100 is used to connect the support 10 and the attachment portion 24 through which the shaft portion 32 of the screw 30 connected to the support 10 is inserted. The vibration-proof mount 100 has an annular main body portion 120 through which the shaft portion 32 is inserted, and a washer 140. The main body portion 120 includes a first portion PT1 that is fitted into an annular groove GR provided in an end face EF10 of the attachment portion 24, and is made of a first material. The washer 140 is made of a second material having a higher elastic modulus than the first material. The washer 140 is disposed between one of the head 34 of the screw 30 and the support 10 and the main body portion 120, and includes a surface SF2 that contacts one of the head 34 of the screw 30 and the support 10, and a surface SF1 that contacts the main body portion 120. For example, the washer 140 included in the anti-vibration mount 100a is disposed between the head 34 of the screw 30 and the body portion 120, and includes a surface SF2 in contact with the head 34 of the screw 30, and a surface SF1 in contact with the body portion 120. In addition, the washer 140 included in the anti-vibration mount 100a is disposed between the support body 10 and the body portion 120, and includes a surface SF2 in contact with the support body 10, and a surface SF1 in contact with the body portion 120.

[0052] In this embodiment, since the annular main body 120 is disposed between the mounting portion 24 and the washer 140, when a force FIN is generated in the radial direction of the main body 120 at the mounting portion 24, the main body 120 undergoes shear deformation. For example, the transmission of vibration generated in one of the support 10 and the mounting portion 24 to the other is suppressed by the main body 120 included in the vibration-proof mount 100 undergoing shear deformation. The rigidity against the force that shears the main body 120 is lower than the rigidity against the force that compresses and deforms the main body 120. Therefore, in this embodiment, the main body 120 can be made lower rigidity than a configuration in which the main body 120 compresses and deforms to suppress the transmission of vibration from one of the support 10 and the mounting portion 24 to the other. As a result, in this embodiment, the transmission of vibration in the low frequency range can be suppressed compared to a configuration in which the main body 120 compresses and deforms to suppress the transmission of vibration. As a result, in this embodiment, the frequency range in which the effect of suppressing the transmission of vibration can be obtained can be widened.

[0053] Furthermore, in this embodiment, the first portion PT1 of the main body portion 120 is fitted into the groove GR formed in the mounting portion 24, so that even if the elastic force FE of the main body portion 120 decreases, the mounting portion 24 is supported by the first portion PT1 fitted into the groove GR. Therefore, in this embodiment, even if the elastic force FE of the main body portion 120 decreases due to long-term use of the vibration-proof mount 100, the support function of the vibration-proof mount 100 to support the mounting portion 24 is ensured. That is, in this embodiment, the support function of the vibration-proof mount 100 can be ensured for a long period of time.

[0054] In addition, in this embodiment, the main body 120 includes an annular protruding portion PP that protrudes from the inner circumferential surface INP1 of the second portion PT2 located between the end face EF10 of the mounting portion 24 and the washer 140 toward the shaft portion 32. As a result, in this embodiment, it is possible to prevent, for example, the inner circumferential surface INP1 of the second portion PT2 from contacting the collar 26 through which the shaft portion 32 is inserted. In addition, in this embodiment, the protruding portion PP does not contact the collar 26 in an initial state in which the main body 120 is attached to the mounting portion 24 so as to surround the collar 26. Note that, in this embodiment, when the inner circumferential surface INP1 of the main body 120 begins to contact the collar 26 due to a decrease in the elastic force FE of the main body 120, first, the tip of the protruding portion PP contacts the collar 26. Therefore, in this embodiment, it is possible to prevent the inner circumferential surface INP1 of the second portion PT2 from contacting the collar 26 in an initial stage of contact between the inner circumferential surface INP1 of the main body 120 and the collar 26. As a result, in this embodiment, when the main body 120 comes into contact with the collar 26 after long-term use of the vibration-proof mount 100, it is possible to prevent the vibration-proof mount 100 from receiving a sudden reaction force from the collar 26.

[0055] Moreover, in this embodiment, the washer 140 includes an annular side wall SW that protrudes from an edge of the surface SF1 in contact with the main body 120 toward the mounting portion 24 and faces the outer peripheral surface OUP1 of the main body 120. For this reason, in this embodiment, even if the elastic force FE of the main body 120 decreases, for example, the shear deformation of the second part PT2 of the main body 120 is limited by the side wall SW, so that the mounting portion 24 is supported by the main body 120 and the side wall SW. Therefore, in this embodiment, even if the elastic force FE of the main body 120 decreases due to long-term use of the vibration-proof mount 100, the support function of the vibration-proof mount 100 to support the mounting portion 24 is ensured. That is, in this embodiment, the support function of the vibration-proof mount 100 can be ensured for a long period of time.

[0056] In this embodiment, the main body 120 is made of an elastic material, and the washer 140 is made of a metal material. In this embodiment, the annular main body 120 is made of an elastic material, so that the rigidity of the main body 120 can be reduced. In this embodiment, the washer 140 is made of a metal material, so that the washer 140 can efficiently receive the elastic force FE of the main body 120. As a result, in this embodiment, it is possible to suppress the friction force FF generated between the washer 140 and the main body 120 from becoming smaller. The washer 140 may be made of a resin material. In this case, the same effect as when the washer 140 is made of a metal material can be obtained.

[0057] [2. Modifications] The above-described embodiment may be modified in various ways. Specific modified aspects that may be applied to the above-described embodiment are illustrated below. Two or more aspects selected from the following examples may be combined to the extent that they are not mutually contradictory.

[0058] [First Modification] In the above-described embodiment, an example has been given in which the main body portion 120 includes an annular protrusion portion PP, but the present invention is not limited to this example. For example, the protrusion portion PP does not have to be formed on the main body portion 120. Note that in this modified example as well, in the initial state in which the main body portion 120 is attached to the attachment portion 24 so as to surround the collar 26, the main body portion 120 does not contact the outer circumferential surface of the collar 26. In this modified example as well, the same effects as those of the above-described embodiment can be obtained, except for the effects obtained by the protrusion portion PP.

[0059] [Second modified example] In the above-described embodiment, an example has been given of a mode in which, in the initial state when the main body portion 120 is attached to the attachment portion 24 so as to surround the collar 26, the protrusion portion PP does not contact the attachment portion 24, but the present invention is not limited to such a mode. For example, in the initial state when the main body portion 120 is attached to the attachment portion 24 so as to surround the collar 26, the tip of the protrusion portion PP may contact the attachment portion 24. In this modified example as well, the same effects as those of the above-described embodiment can be obtained.

[0060] [Third Modification] In the above-described embodiment, first modified example, and second modified example, the washer 140 includes an annular side wall portion SW, but the present invention is not limited to such an embodiment. For example, the washer 140 does not need to include an annular side wall portion SW. In other words, the bottom portion BT may be used as the washer 140. In this modified example, the same effects as those of the above-described embodiment can be obtained, except for the effects obtained by the side wall portion SW.

[0061] [Fourth Variation] In the above-described embodiment, the first modified example, the second modified example, and the third modified example, the vibration isolation mount 100 is used to attach an automobile part, but the vibration isolation mount 100 may be used to attach a part other than an automobile part. In this modified example, the same effects as those of the above-described embodiment and modified examples can be obtained. [Explanation of symbols]

[0062] 10...Support, 20…Housing, 22...Housing body, 24, 24ex…Mounting part, 26, 26ex...color, 30…Screw, 32...shaft portion, 34...head, 100, 100a, 100b, 100ex...Anti-vibration mount, 120...Main body, 140…washer, BT...Bottom, GR…Groove, HL1, HL2, HL10, HL20, HL20ex…shaft hole, PP…protrusion, PT1…first part, PT2…Second part, SW…Side wall part.

Claims

1. 1. A vibration-proof mount used for connecting a first member to a second member through which a shaft portion of a fastening member connected to the first member is inserted, comprising: a ring-shaped main body portion including an edge portion that is fitted into a ring-shaped groove provided on an end surface of the second member and through which the shaft portion is inserted; an auxiliary portion disposed between one of the head portion of the fastening member and the first member and the main body portion, the auxiliary portion including a surface in contact with the one of the head portion and the first member and a surface in contact with the main body portion, the auxiliary portion being inserted through the shaft portion; Equipped with the body portion is formed of a first material; the auxiliary portion is formed of a second material having a higher elastic modulus than the first material, The main body portion is a ring-shaped protruding portion protruding from an inner circumferential surface of a portion of the second member located between the end surface and the auxiliary portion toward the shaft portion, An anti-vibration mount characterized by:

2. A cylindrical portion through which the shaft portion is inserted is inserted into the second member, The protrusion is In an initial state in which the main body portion is attached to the second member so as to surround the cylindrical portion, the main body portion does not come into contact with the cylindrical portion.

2. The anti-vibration mount according to claim 1.

3. The auxiliary unit includes: a ring-shaped side wall portion protruding from an edge of the surface in contact with the main body portion toward the second member and facing an outer circumferential surface of the main body portion; 3. An anti-vibration mount according to claim 1 or 2.

4. the first material is an elastic material; 4. An anti-vibration mount according to claim 1.

5. The second material is a metal material or a resin material.

5. An anti-vibration mount according to claim 1.

6. Two anti-vibration mounts according to any one of claims 1 to 5, one of the two anti-vibration mounts is disposed between the head of the fastening member and the second member; the other of the two anti-vibration mounts is disposed between the first member and the second member; A vibration-proof structure characterized by:

7. A method for connecting a first member to a second member through which a shaft portion of a fastening member connected to the first member is inserted, comprising: two vibration-proof mounts used for connecting a first member to a second member through which a shaft portion of a fastening member connected to the first member is inserted; Each of the two anti-vibration mounts comprises: a ring-shaped main body portion including an edge portion that is fitted into a ring-shaped groove provided on an end surface of the second member and through which the shaft portion is inserted; an auxiliary portion disposed between one of the head portion of the fastening member and the first member and the main body portion, the auxiliary portion including a surface in contact with the one of the head portion and the first member and a surface in contact with the main body portion, the auxiliary portion being inserted through the shaft portion; Equipped with the body portion is formed of a first material; the auxiliary portion is formed of a second material having a higher elastic modulus than the first material, one of the two anti-vibration mounts is disposed between the head of the fastening member and the second member; the other of the two anti-vibration mounts is disposed between the first member and the second member; A vibration-proof structure characterized by:

Images