Vibration isolation device

Abstract

The present application is a vibration isolation device (1) including: a first vibration isolation rubber cylinder (11) that links a vibration generating portion and a vibration receiving portion in a first direction; a second vibration isolation rubber cylinder (12) that sandwiches either of the vibration generating portion and the vibration receiving portion in the first direction between the second vibration isolation rubber cylinder (12) and the first vibration isolation rubber cylinder (11); and a support member (13) that sandwiches the second vibration isolation rubber cylinder (12) in the first direction between the support member (13) and one member, the first vibration isolation rubber cylinder (11) and the second vibration isolation rubber cylinder (12) are provided in a posture in which respective center axes (O) extend in the first direction, and a peripheral groove (15) is formed in an outer peripheral surface and an inner peripheral surface of at least one of the first vibration isolation rubber cylinder (11) and the second vibration isolation rubber cylinder (12).

Description

Technical Field

[0001] This invention relates to a vibration isolation device. This application claims priority based on Japanese Patent Application No. 2021-107982, filed on June 29, 2021, the contents of which are incorporated herein by reference. Background Technology

[0002] Previously, vibration isolation devices such as those shown in Patent Document 1 below were known. This vibration isolation device includes: a first vibration isolation rubber sleeve that connects a vibration generating part and a vibration receiving part to each other in a first direction; a second vibration isolation rubber sleeve that clamps either the vibration generating part or the vibration receiving part between the second vibration isolation rubber sleeve and the first vibration isolation rubber sleeve in the first direction; and a support member that clamps the second vibration isolation rubber sleeve between the support member and the first member in the first direction, wherein the first and second vibration isolation rubber sleeves are positioned such that their respective central axes extend in the first direction.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2004-150596 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] However, the conventional vibration isolation device has the following problems: for example, during the compression deformation of the second vibration isolation rubber cylinder along the first direction, the end of the second vibration isolation rubber cylinder on the side of the component along the first direction deforms radially, the second vibration isolation rubber cylinder does not compress and deform straight in the first direction but deforms obliquely, the static stiffness of the second vibration isolation rubber cylinder decreases, and it is difficult to ensure the durability of the second vibration isolation rubber cylinder.

[0008] The same problem may occur with the first vibration isolation rubber cylinder.

[0009] The present invention was made with regard to such a situation in mind, and aims to provide a vibration isolation device that allows at least one of the first vibration isolation rubber cylinder and the second vibration isolation rubber cylinder to be compressed and deformed in a straight direction in a first direction.

[0010] Solution for solving the problem

[0011] To address the aforementioned problems and achieve this objective, one aspect of the present invention is a vibration isolation device comprising: a first vibration isolation rubber cylinder that connects a vibration generating part and a vibration receiving part to each other in a first direction; a second vibration isolation rubber cylinder that clamps either the vibration generating part or the vibration receiving part between the second vibration isolation rubber cylinder and the first vibration isolation rubber cylinder in the first direction; and a support member that clamps the second vibration isolation rubber cylinder between the support member and the first member in the first direction, wherein the first vibration isolation rubber cylinder and the second vibration isolation rubber cylinder are configured such that their respective central axes extend in the first direction, and at least one of the first vibration isolation rubber cylinder and the second vibration isolation rubber cylinder has a peripheral groove formed on its outer and inner peripheral surfaces, respectively.

[0012] The effects of the invention

[0013] According to the present invention, at least one of the first vibration isolation rubber cylinder and the second vibration isolation rubber cylinder can be easily compressed and deformed in a straight direction in the first direction. Attached Figure Description

[0014] Figure 1 This is a longitudinal sectional view of a vibration isolation device according to one embodiment.

[0015] Figure 2 yes Figure 1 The diagram shows the state of the second vibration isolation rubber cylinder under compression deformation in the first direction.

[0016] Figure 3 yes Figure 2 The diagram shows the state of the second vibration isolation rubber cylinder under further compression and deformation in the first direction. Detailed Implementation

[0017] The following is for reference Figure 1 This describes one implementation method of a vibration isolation device.

[0018] The vibration isolation device 1 includes a first vibration isolation rubber cylinder 11, a second vibration isolation rubber cylinder 12, a second support member (support member) 13, and a core cylinder 14. When vibration is input from the vibration generating part X, the vibration isolation device 1 elastically deforms the first vibration isolation rubber cylinder 11 and the second vibration isolation rubber cylinder 12, thereby suppressing the transmission of the input vibration to the vibration receiving part Y. Examples of vibration generating parts X include, for example, a vehicle frame, and examples of vibration receiving parts Y include, for example, a vehicle body.

[0019] The first vibration isolation rubber sleeve 11 and the second vibration isolation rubber sleeve 12 are configured such that their respective central axes extend in the first direction. In the illustrated example, the first vibration isolation rubber sleeve 11 and the second vibration isolation rubber sleeve 12 are coaxially configured with a common axis extending in the first direction.

[0020] Hereinafter, the common axis will be referred to as the central axis O, the side of the first vibration isolation rubber cylinder 11 along the first direction will be referred to as the upper side, and the side of the second vibration isolation rubber cylinder 12 will be referred to as the lower side. When viewed from the first direction, the direction intersecting the central axis O will be referred to as the radial direction, and the direction of rotation around the central axis O will be referred to as the circumferential direction.

[0021] The first vibration isolation rubber sleeve 11 connects the vibration generating part X and the vibration receiving part Y to each other in the first direction.

[0022] In the illustrated example, the vibration generating part X is located below the first vibration isolation rubber cylinder 11. The vibration receiving part Y is located above the first vibration isolation rubber cylinder 11.

[0023] A first support member 21 is installed at the upper opening edge of the first vibration-damping rubber sleeve 11. The first support member 21 is formed in the shape of an annular plate and is arranged coaxially with the central axis O. The first support member 21 protrudes radially inward from the upper opening edge of the first vibration-damping rubber sleeve 11. The first support member 21 is vulcanized and bonded to the upper opening edge of the first vibration-damping rubber sleeve 11. The first vibration-damping rubber sleeve 11 is connected to the vibration-bearing part Y by means of the first support member 21. The first vibration-damping rubber sleeve 11 is configured to be in a state of compression deformation in the first direction.

[0024] Alternatively, the first support member 21 may be omitted, and the first vibration isolation rubber cylinder 11 may be directly connected to the vibration bearing part Y.

[0025] A cylindrical damping protrusion 11b is formed at the lower end opening edge of the first vibration isolation rubber sleeve 11. The cylindrical damping protrusion 11b protrudes downward and is inserted into the first communicating hole 31 of the vibration generating part X (described later). The damping protrusion 11b is coaxially arranged with the central axis O.

[0026] The second vibration isolation rubber cylinder 12 clamps either the vibration generating part X or the vibration bearing part Y in the first direction between the second vibration isolation rubber cylinder 12 and the first vibration isolation rubber cylinder 11.

[0027] In the illustrated example, the second vibration-damping rubber sleeve 12 is disposed below the first vibration-damping rubber sleeve 11. The second vibration-damping rubber sleeve 12 sandwiches the vibration-generating part X between the second vibration-damping rubber sleeve 12 and the first vibration-damping rubber sleeve 11 in the first direction.

[0028] A recess 16 is formed at the upper opening edge of the second vibration isolation rubber cylinder 12, which opens radially inward. In the upper opening edge of the second vibration isolation rubber cylinder 12, the radial size of the recess 16 is the same as the radial size of the portion located radially outward of the recess 16 and abutting against the vibration generating part X.

[0029] Alternatively, the second vibration isolation rubber sleeve 12 may not have a recess 16.

[0030] The second support member 13 clamps the second vibration-damping rubber cylinder 12 between the second support member 13 and the vibration-generating part X in the first direction. The second support member 13 is installed at the lower end opening edge of the second vibration-damping rubber cylinder 12. The second support member 13 is formed as an annular plate and is coaxially arranged with the central axis O. The second support member 13 protrudes radially inward from the lower end opening edge of the second vibration-damping rubber cylinder 12. The second support member 13 is vulcanized and bonded to the lower end opening edge of the second vibration-damping rubber cylinder 12. The second vibration-damping rubber cylinder 12 is configured to be in a state of compression deformation in the first direction.

[0031] Here, a first connecting hole (connecting hole) 31 is formed in the vibration generating part X, which is sandwiched between the first vibration isolation rubber cylinder 11 and the second vibration isolation rubber cylinder 12 along the first direction, so that the contents of the first vibration isolation rubber cylinder 11 and the second vibration isolation rubber cylinder 12 are connected in the first direction. The first connecting hole 31 is arranged coaxially with the central axis O.

[0032] A stop cylinder 32 is provided at the periphery of the opening of the first connecting hole 31 of the vibration generating part X, which is inserted into the recess 16 of the second vibration isolation rubber cylinder 12. The stop cylinder 32 protrudes downward from the vibration generating part X. The lower end opening edge of the stop cylinder 32 separates upward from the bottom surface 16a of the inner surface of the recess 16 facing the vibration generating part X in the first direction. The lower end opening edge of the stop cylinder 32 is opposite to the bottom surface 16a of the recess 16 in the first direction. The stop cylinder 32 is integrally formed with the vibration generating part X. The stop cylinder 32 is formed, for example, by a flange forming process.

[0033] Alternatively, the stop cylinder 32 may not be provided in the vibration generating part X.

[0034] The core cylinder 14 extends integrally through the first connecting hole 31 of the vibration generating part X and within the first vibration isolating rubber cylinder 11 and the second vibration isolating rubber cylinder 12. The core cylinder 14 is held in the first direction by the second support member 13 and either the vibration generating part X or the vibration receiving part Y. In the illustrated example, the core cylinder 14 is fixed by being held in the first direction by the first support member 21 and the second support member 13. The core cylinder 14 is connected to the vibration receiving part Y by means of the first support member 21. The core cylinder 14 can also be joined to either the first support member 21 or the second support member 13, for example, by welding. The core cylinder 14 is arranged coaxially with the central axis O.

[0035] In addition, the core tube 14 can also be directly connected to the vibration-bearing part Y.

[0036] Here, a second connecting hole 33 is formed in the vibration-bearing part Y, opening into the first support member 21. The second connecting hole 33 is arranged coaxially with the central axis O.

[0037] Nut N is fastened to headed bolt B, which integrally penetrates the inner sides of the second connecting hole 33, the first support member 21, the core cylinder 14, and the second support member 13, thereby clamping the vibration-bearing part Y and the second support member 13 in the first direction.

[0038] Furthermore, in this embodiment, at least one of the first vibration-damping rubber cylinder 11 and the second vibration-damping rubber cylinder 12 has a circumferential groove 15 formed on its outer and inner circumferential surfaces, respectively. The circumferential groove 15 extends continuously over its entire circumferential length.

[0039] In the illustrated example, the peripheral groove 15 is formed on the outer peripheral surface of the first vibration isolation rubber cylinder 11, and is formed on the outer peripheral surface and inner peripheral surface of the second vibration isolation rubber cylinder 12, respectively.

[0040] In the second vibration-damping rubber sleeve 12, the number of circumferential grooves 15 formed on the outer circumferential surface is greater than the number of circumferential grooves 15 formed on the inner circumferential surface. In the example shown, the former is set to 3 grooves, and the latter to 2 grooves.

[0041] Alternatively, the number of entries for the former can be set to be less than the number of entries for the latter, or the number of entries for both the former and the latter can be set to 1.

[0042] In the second vibration isolation rubber sleeve 12, the central portions of the peripheral groove 15 formed on the outer peripheral surface and the peripheral groove 15 formed on the inner peripheral surface in the first direction are offset in the first direction.

[0043] Furthermore, in the second vibration isolation rubber sleeve 12, the central portion of the peripheral groove 15 formed on the outer peripheral surface and the peripheral groove 15 formed on the inner peripheral surface in the first direction can be located at the same position in the first direction.

[0044] The uppermost and lowermost peripheral grooves 15 of all the peripheral grooves 15 of the second vibration isolation rubber cylinder 12 are formed on the outer peripheral surface of the second vibration isolation rubber cylinder 12.

[0045] Alternatively, the uppermost and lowermost peripheral grooves 15 in all the peripheral grooves 15 formed in the second vibration isolation rubber cylinder 12 can be formed on the inner peripheral surface of the second vibration isolation rubber cylinder 12.

[0046] A plurality of peripheral grooves 15 are formed on the inner peripheral surface of the second vibration-damping rubber cylinder 12 at intervals in the first direction. That is, the peripheral grooves 15 formed on the inner peripheral surface of the second vibration-damping rubber cylinder 12 include a plurality of peripheral grooves 15 formed on the inner peripheral surface of the second vibration-damping rubber cylinder 12 at intervals in the first direction. The lowermost peripheral groove 15 among the plurality of peripheral grooves 15 is formed to have the largest groove width and the smallest depth among all the peripheral grooves 15 formed on the second vibration-damping rubber cylinder 12.

[0047] In the illustrated example, the uppermost circumferential groove 15 among the plurality of circumferential grooves 15 formed on the outer peripheral surface of the second vibration isolation rubber cylinder 12 has a smaller groove width and depth than the other circumferential grooves 15.

[0048] The width of the uppermost circumferential groove among the plurality of circumferential grooves 15 formed on the inner circumferential surface of the second vibration-damping rubber cylinder 12 is the same as the width of the uppermost circumferential groove 15 among the plurality of circumferential grooves 15 formed on the outer circumferential surface of the second vibration-damping rubber cylinder 12. The depth of the uppermost circumferential groove among the plurality of circumferential grooves 15 formed on the inner circumferential surface of the second vibration-damping rubber cylinder 12 is shallower than the depth of the uppermost circumferential groove 15 among the plurality of circumferential grooves 15 formed on the outer circumferential surface of the second vibration-damping rubber cylinder 12.

[0049] As explained above, according to the vibration isolation device 1 of this embodiment, with the input of vibration in the first direction, the vibration bearing part Y and the second support member 13 displace in the first direction while the first vibration isolation rubber cylinder 11 and the second vibration isolation rubber cylinder 12 are elastically deformed. This absorbs the input vibration.

[0050] At least one of the first vibration-damping rubber cylinder 11 and the second vibration-damping rubber cylinder 12 has circumferential grooves 15 formed on both its outer and inner circumferential surfaces. Therefore, when such a rubber cylinder is compressed and deformed in the first direction, it is possible to suppress situations where the deformation differs significantly between the inner and outer circumferential surfaces of the rubber cylinder. Furthermore, this allows the rubber cylinder to be easily compressed and deformed in a straight line in the first direction, preventing skewed deformation during compression and deformation along the first direction that could lead to a decrease in static stiffness.

[0051] A core cylinder 14 is provided. As a result, with the input of vibration in the first direction, the vibration-bearing part Y and the second support member 13, while maintaining the distance in the first direction, cause the first vibration-damping rubber cylinder 11 and the second vibration-damping rubber cylinder 12 to elastically deform and displace in the first direction, thereby absorbing the input vibration.

[0052] The core cylinder 14 and the stop cylinder 32 are provided. Thus, when vibration is input in a direction intersecting the first direction, the outer peripheral surface of the core cylinder 14 and the inner peripheral surface of the stop cylinder 32 can be brought into contact with each other, limiting the relative displacement between the vibration generating part X and the vibration receiving part Y.

[0053] The peripheral grooves 15 are formed on the outer and inner peripheral surfaces of the second vibration-damping rubber sleeve 12, respectively. Thus, as... Figure 2 and Figure 3As shown, when the second vibration isolation rubber cylinder 12 is compressed and deformed along the first direction, it is possible to suppress the situation where the deformation is significantly different on the inner and outer circumferential surfaces of the second vibration isolation rubber cylinder 12. Moreover, as a result, the second vibration isolation rubber cylinder 12 can be easily compressed and deformed in a straight line in the first direction, and it is possible to suppress the reduction of static stiffness caused by skewed deformation during the compression and deformation along the first direction.

[0054] In this way, the second vibration isolation rubber cylinder 12 can be easily compressed and deformed in a straight line in the first direction. As a result, when the second vibration isolation rubber cylinder 12 is compressed and deformed in the first direction, it is possible to suppress the second vibration isolation rubber cylinder 12 from deforming obliquely with a portion of the inner circumferential surface of the second vibration isolation rubber cylinder 12 toward the lower end of the stop cylinder portion 32, and it is possible to prevent the lower end of the stop cylinder portion 32 from entering the second vibration isolation rubber cylinder 12.

[0055] In the second vibration-damping rubber cylinder 12, the number of circumferential grooves 15 formed on the outer circumferential surface is greater than the number of circumferential grooves 15 formed on the inner circumferential surface. Therefore, even if a recess 16 with a radially inward opening is formed at the upper opening edge of the second vibration-damping rubber cylinder 12, the upper end of the second vibration-damping rubber cylinder 12 is less likely to undergo radially outward bulging bending deformation during the compression deformation of the second vibration-damping rubber cylinder 12 in the first direction, and the second vibration-damping rubber cylinder 12 can be reliably compressed and deformed in a straight line in the first direction.

[0056] The lowest circumferential groove 15 (hereinafter referred to as the corresponding circumferential groove) among the plurality of circumferential grooves 15 formed on the inner circumferential surface of the second vibration isolation rubber cylinder 12 is formed such that the groove width is the largest among all the circumferential grooves 15 formed on the second vibration isolation rubber cylinder 12 and the depth is the smallest among all the circumferential grooves 15 formed on the second vibration isolation rubber cylinder 12.

[0057] Therefore, the amount of compression deformation of the second vibration-damping rubber cylinder 12 along the first direction can be ensured to be large until the wide and shallow corresponding circumferential groove is pressed closed in the first direction. As a result, when the second vibration-damping rubber cylinder 12 is compressed and deformed along the first direction, it is possible to reliably suppress the second vibration-damping rubber cylinder 12 from deforming obliquely with a portion of the inner circumferential surface of the second vibration-damping rubber cylinder 12 toward the lower end of the stop cylinder portion 32, and it is also possible to make the second vibration-damping rubber cylinder 12 easy to demold from the vulcanization molding die.

[0058] The vibration isolation device of the present invention comprises: a first vibration isolation rubber cylinder that connects a vibration generating part and a vibration receiving part to each other in a first direction; a second vibration isolation rubber cylinder that clamps either the vibration generating part or the vibration receiving part between the second vibration isolation rubber cylinder and the first vibration isolation rubber cylinder in the first direction; and a support member that clamps the second vibration isolation rubber cylinder between the support member and the first member in the first direction, wherein the first vibration isolation rubber cylinder and the second vibration isolation rubber cylinder are configured such that their respective central axes extend in the first direction, and peripheral grooves are formed on the outer and inner peripheral surfaces of at least one of the first vibration isolation rubber cylinder and the second vibration isolation rubber cylinder.

[0059] According to the present invention, with the input of vibration in the first direction, any other member of the vibration generating part and the vibration receiving part, as well as the supporting member, displace in the first direction while elastically deforming the first and second vibration-damping rubber cylinders, thereby absorbing the input vibration. A circumferential groove is formed on both the outer and inner circumferential surfaces of at least one of the first and second vibration-damping rubber cylinders. Therefore, when such a rubber cylinder is compressed and deformed along the first direction, it is possible to suppress situations where the deformation differs significantly between the inner and outer circumferential surfaces of the rubber cylinder. Furthermore, this allows for easy, straight compression and deformation in the first direction of the rubber cylinder, preventing skewed deformation during compression and deformation along the first direction that could lead to a decrease in static stiffness.

[0060] Alternatively, a connecting hole is formed in one component to connect the first vibration isolation rubber cylinder and the second vibration isolation rubber cylinder in the first direction. The vibration isolation device includes a core cylinder that integrally penetrates the first and second vibration isolation rubber cylinders through the connecting hole. The core cylinder is held in the first direction by the support member and either the vibration generating part or the vibration receiving part. The peripheral grooves are formed on the outer and inner peripheral surfaces of the second vibration isolation rubber cylinder, respectively. A recess with a radially inward opening is formed at the opening edge of the second vibration isolation rubber cylinder on the one component side along the first direction. A stop cylinder portion that inserts into the recess is provided at the periphery of the opening of the connecting hole in the one component.

[0061] In this case, a core cylinder is provided, so that as vibration in the first direction is input, any other component in the vibration generating part and the vibration receiving part, as well as the supporting component, while maintaining the distance in the first direction, causes the first vibration isolation rubber cylinder and the second vibration isolation rubber cylinder to elastically deform and displace in the first direction, thereby absorbing the input vibration.

[0062] The second vibration-damping rubber cylinder is provided with a core cylinder and a stop cylinder. Therefore, when vibration is input in a direction intersecting the first direction, the outer circumferential surface of the core cylinder and the inner circumferential surface of the stop cylinder can abut against each other, limiting the relative displacement between the vibration-generating part and the vibration-bearing part. Circumferential grooves are formed on the outer and inner circumferential surfaces of the second vibration-damping rubber cylinder, respectively. Therefore, when the second vibration-damping rubber cylinder is compressed and deformed along the first direction, it is possible to suppress situations where the deformation differs significantly between the inner and outer circumferential surfaces of the second vibration-damping rubber cylinder. Furthermore, this allows the second vibration-damping rubber cylinder to be easily compressed and deformed vertically in the first direction, preventing skewed deformation during compression and deformation along the first direction that could lead to a decrease in static stiffness.

[0063] In this way, the second vibration isolation rubber cylinder can be easily compressed and deformed in a straight direction. As a result, when the second vibration isolation rubber cylinder is compressed and deformed in the first direction, it is possible to suppress the second vibration isolation rubber cylinder from deforming obliquely with a portion of the inner circumferential surface of the second vibration isolation rubber cylinder toward the top end of the stop cylinder, and to prevent the top end of the stop cylinder from easily entering the second vibration isolation rubber cylinder.

[0064] Alternatively, in the second vibration-damping rubber cylinder, the number of peripheral grooves formed on the outer peripheral surface is greater than the number of peripheral grooves formed on the inner peripheral surface.

[0065] In this case, the number of circumferential grooves formed on the outer circumferential surface of the second vibration-damping rubber cylinder is greater than the number of circumferential grooves formed on the inner circumferential surface. Therefore, even if a recess with a radially inward opening is formed at the open end edge of the second vibration-damping rubber cylinder on the component side along the first direction, the end of the second vibration-damping rubber cylinder on the component side along the first direction is less prone to radially outward bulging during compression deformation along the first direction, allowing the second vibration-damping rubber cylinder to reliably compress and deform straight in the first direction.

[0066] Alternatively, the circumferential groove formed on the inner circumferential surface of the second vibration-damping rubber cylinder may include a plurality of circumferential grooves formed on the inner circumferential surface of the second vibration-damping rubber cylinder at intervals in the first direction. The circumferential groove located closest to the support member side along the first direction is formed such that its width is the largest and its depth is the smallest among all the circumferential grooves formed on the second vibration-damping rubber cylinder.

[0067] In this case, the circumferential groove located closest to the support member side along the first direction among the plurality of circumferential grooves formed on the inner circumferential surface of the second vibration-damping rubber cylinder (hereinafter referred to as the corresponding circumferential groove) is formed such that its width is the largest and its depth is the smallest among all the circumferential grooves formed on the second vibration-damping rubber cylinder. Therefore, it is possible to ensure a large amount of compression deformation of the second vibration-damping rubber cylinder along the first direction until the wide and shallow corresponding circumferential groove is pressed closed in the first direction. As a result, when the second vibration-damping rubber cylinder is compressed and deformed along the first direction, it is possible to reliably suppress the second vibration-damping rubber cylinder from deforming obliquely toward the top end of the stop cylinder portion with a portion of the inner circumferential surface side of the second vibration-damping rubber cylinder, and it is also possible to facilitate the demolding of the second vibration-damping rubber cylinder from the vulcanization molding die.

[0068] Furthermore, the scope of protection of the present invention is not limited to the aforementioned embodiments, and various modifications may be made without departing from the spirit of the present invention.

[0069] For example, the first direction can also be a direction that intersects with the vertical direction, and the orientation of the vibration isolation device 1 can also be appropriately changed for the vehicle.

[0070] Alternatively, the core cylinder 14 and the stop cylinder 32 may not be provided.

[0071] Alternatively, all the circumferential grooves 15 formed in the second vibration isolation rubber sleeve 12 can be the same size. Alternatively, circumferential grooves 15 can be formed on the outer and inner circumferential surfaces of the first vibration isolation rubber sleeve 11, respectively.

[0072] Alternatively, the vibration-bearing part Y is sandwiched between the second vibration-damping rubber cylinder 12 and the first vibration-damping rubber cylinder 11 in the first direction, and a stop cylinder part 32 is provided at the periphery of the opening of the second connecting hole 33 of the vibration-bearing part Y, which is inserted into the recess 16 of the second vibration-damping rubber cylinder 12.

[0073] Vibration isolation device 1 is not limited to the cab support of a vehicle. For example, it can also be applied to the beam support of a vehicle, the support of a generator mounted on building equipment, or the support of equipment installed in a factory, etc.

[0074] Furthermore, without departing from the spirit of the present invention, the constituent elements in the above embodiments may be appropriately replaced with well-known constituent elements. In addition, the above embodiments and variations may be appropriately combined.

[0075] Industrial availability

[0076] According to the present invention, at least one of the first vibration isolation rubber cylinder and the second vibration isolation rubber cylinder can be easily compressed and deformed in a straight direction in the first direction.

[0077] Explanation of reference numerals in the attached figures

[0078] 1. Vibration isolation device; 11. First vibration isolation rubber cylinder; 12. Second vibration isolation rubber cylinder; 13. Second support member (support member); 14. Core cylinder; 15. Peripheral groove; 16. Recess; 21. First support member; 31. First connecting hole (connecting hole); 32. Stop cylinder part; 33. Second connecting hole; O. Central axis; X. Vibration generating part; Y. Vibration bearing part.

Claims

1. A vibration isolation device, wherein, This vibration isolation device has the following features: The first vibration isolation rubber sleeve connects the vibration generating part and the vibration receiving part to each other in the first direction; The second vibration isolation rubber cylinder clamps either the vibration generating part or the vibration bearing part between the second vibration isolation rubber cylinder and the first vibration isolation rubber cylinder in the first direction; as well as A support member that clamps the second vibration-damping rubber cylinder between the support member and the first member in the first direction. The first and second vibration-damping rubber sleeves are configured such that their respective central axes extend in the first direction. At least one of the first vibration-damping rubber cylinder and the second vibration-damping rubber cylinder has peripheral grooves formed on its outer and inner peripheral surfaces, respectively. One of the components has a connecting hole that allows communication between the interior of the first vibration-damping rubber cylinder and the interior of the second vibration-damping rubber cylinder in the first direction. The vibration isolation device includes a core cylinder that integrally penetrates both the first and second vibration isolation rubber cylinders via the connecting hole, and is held in place in the first direction by the support member and either the vibration generating part or the vibration receiving part. The peripheral grooves are formed on the outer and inner peripheral surfaces of the second vibration-damping rubber cylinder, respectively. A recess with an inward opening is formed at the opening end edge of the second vibration-damping rubber cylinder on the side of the one component along the first direction. A stop cylinder portion that inserts into the recess is provided at the periphery of the opening of the communicating hole in one of the components. In the second vibration-damping rubber cylinder, the number of peripheral grooves formed on the outer peripheral surface is greater than the number of peripheral grooves formed on the inner peripheral surface.

2. The vibration isolation device according to claim 1, wherein, The circumferential groove formed on the inner circumferential surface of the second vibration-damping rubber cylinder includes a plurality of circumferential grooves formed on the inner circumferential surface of the second vibration-damping rubber cylinder at intervals in the first direction. The peripheral groove located closest to the support member side along the first direction among the plurality of peripheral grooves is formed such that its width is the largest among all the peripheral grooves formed in the second vibration isolation rubber cylinder and its depth is the smallest among all the peripheral grooves formed in the second vibration isolation rubber cylinder.

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