Anti-vibration device

Abstract

To provide a vibration-proofing device enabling the cost thereof to be reduced.SOLUTION: A vibration-proofing device 1 is constituted for use in a suspension and includes: a telescopic portion 12 having a damper rod 121 and a cylinder 122; a strut mount portion 13 mounted to the damper rod; a suspension 17 arranged on the outer periphery side of the telescopic portion; a support portion 16 formed of a rigid body and supporting the upper end of the suspension spring portion; and a laminated portion 14 arranged on the outer periphery side of the damper rod and connected between the strut mount portion and the support portion, wherein the laminated portion has annular rubber layers 141 and annular rigid body layers 142 alternately layered in the axial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an anti-vibration device. [Background technology]

[0002] Conventionally, there has been a vibration isolation device in which a bearing is provided between a strut mount and a support member that supports a coil spring (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-285002 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional techniques have room for improvement in terms of cost.

[0005] An object of the present invention is to provide a vibration isolation device that enables cost reduction. [Means for solving the problem]

[0006] [1] A vibration isolation device configured to be used in a suspension, an extendable section having a damper rod and a cylinder; a strut mount portion attached to the damper rod; a suspension spring portion disposed on the outer circumferential side of the expansion and contraction portion; a support portion made of a rigid body configured to support an upper end portion of the suspension spring portion; a laminated portion disposed on an outer circumferential side of the damper rod and connected between the strut mount portion and the support portion; Equipped with The laminated portion has annular rubber layers and annular rigid layers laminated alternately in the axial direction.

[0007] [2] The vibration isolation device is provided with an integrally molded product, The vibration-damping device according to [1], wherein the integrally molded product has the strut mount portion and the laminated portion.

[0008] [3] The vibration-damping device described in [2], wherein the integrally molded product further has a bump rubber portion arranged on the outer periphery of the damper rod and below the support portion.

[0009] [4] The vibration-damping device according to [2] or [3], wherein the integrally molded product further has a dust cover portion made of rubber arranged on the outer periphery of the expansion / contraction portion.

[0010] [5] The suspension spring portion is an outermost cylindrical rigid layer arranged on the outer peripheral side of the stretchable portion; a cylindrical rubber layer connected between an outer peripheral surface of the cylinder and an inner peripheral surface of the outermost cylindrical rigid layer; and The vibration-damping device according to any one of [1] to [4], wherein an upper end of the outermost cylindrical rigid layer is connected to the support portion.

[0011] [6] The vibration-damping device further includes a bump rubber portion disposed on the outer circumferential side of the damper rod and below the support portion, [5] An anti-vibration device as described in [5], wherein when the upper end of the cylinder is in contact with the bump rubber portion, the main air chamber partitioned between the support portion, the suspension spring portion, and the expansion / contraction portion becomes a closed space.

[0012] [7] An anti-vibration device as described in [5] or [6], wherein the telescopic section is configured to pump air into a main air chamber partitioned between the support section, the suspension spring section, and the telescopic section during a compression stroke.

[0013] [8] The strut mount portion is A bracket configured to be attached to a vehicle body side; a mounting member attached to the damper rod; a mount body rubber that connects the bracket and the mounting member together; Equipped with The vibration-damping device according to any one of [1] to [7], wherein the bracket and the mounting member each have a curved portion that is curved along a spherical shape having the same center point. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a vibration isolation device that enables cost reduction. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a vertical cross-sectional view showing a vibration isolation device according to a first embodiment of the present invention. [Figure 2] 2 is a cross-sectional view of the vibration isolation device of FIG. 1 taken along the line AA of FIG. 1. FIG. [Figure 3] FIG. 5 is a vertical cross-sectional view showing a part of an anti-vibration device according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a vertical cross-sectional view showing a vibration isolation device according to a third embodiment of the present invention. [Figure 5] 5 is a diagram for explaining the operation of the vibration isolation device of FIG. 4. [Figure 6] 5 is a diagram for explaining the operation of the vibration isolation device of FIG. 4. [Figure 7] FIG. 10 is a vertical cross-sectional view showing a vibration isolation device according to a fourth embodiment of the present invention. [Figure 8] FIG. 10 is a vertical cross-sectional view showing a vibration isolation device according to a fifth embodiment of the present invention. [Figure 9] 9 is a diagram for explaining the operation of the vibration isolation device of FIG. 8. [Figure 10] 9 is a diagram for explaining the operation of the vibration isolation device of FIG. 8. [Figure 11] FIG. 10 is a vertical cross-sectional view showing a vibration isolation device according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] The vibration-damping device according to the present invention is suitable for use in strut-type suspensions, and particularly suitable for use in MacPherson strut-type suspensions. The vibration-damping device according to the present invention can be applied to any type of vehicle, but is particularly suitable for use in relatively inexpensive and lightweight vehicles such as ultra-compact mobility vehicles. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an anti-vibration device according to the present invention will be described below with reference to the drawings.

[0017] [First embodiment] 1 and 2 are diagrams illustrating a vibration isolation device 1 according to a first embodiment of the present invention. The vibration damping device 1 of this embodiment is configured to be used in a suspension provided in a vehicle. As a suspension for which the vibration damping device 1 is used, a strut suspension is preferred, and a MacPherson strut suspension is more preferred. Furthermore, the vibration damping device 1 of this embodiment can be applied to any type of vehicle, but is preferably applied to a relatively inexpensive and lightweight vehicle such as an ultra-compact mobility vehicle.

[0018] As shown in FIG. 1, in the first embodiment, the vibration-damping device 1 includes an expansion / contraction section 12, a strut mount section 13, a suspension spring section 17, a support section 16, a laminated section 14, a receiving rubber section 18, a bump rubber section 19, and a dust cover section 20. A suspension (not shown) equipped with the vibration-damping device 1 includes, in addition to the vibration-damping device 1, a hub (not shown), a knuckle (not shown), and the like.

[0019] The telescopic unit 12 has a damper rod 121 and a cylinder 122. The cylinder 122 is disposed coaxially with the central axis of the damper rod 121 (hereinafter referred to as the "rod axis RA") and is located on the outer periphery of the damper rod 121. The damper rod 121 and the cylinder 122 are slidable relative to each other, thereby allowing the telescopic unit 12 to extend and retract in a direction parallel to the rod axis RA (axial direction). The upper end of the cylinder 122 is located below the upper end of the damper rod 121. In this embodiment, the telescopic unit 12 is configured as a shock absorber. The telescopic unit 12 may have a configuration similar to that of a conventionally known shock absorber.

[0020] In a suspension (not shown), a knuckle (not shown) protrudes inward in the left-right direction of the vehicle from a hub (not shown). The hub (not shown) rotatably supports a wheel (not shown; for example, a front wheel). The lower end (not shown) of the cylinder 122 of the telescopic section 12 is configured to be connected to a knuckle (not shown).

[0021] In this specification, the term "inner side in the left-right direction of the vehicle" refers to the side closer to the center of the vehicle in the left-right direction of the vehicle, while the term "outer side in the left-right direction of the vehicle" refers to the side farther from the center of the vehicle in the left-right direction of the vehicle.

[0022] When the vehicle is stationary, the rod axis RA is substantially parallel to the vehicle vertical direction. The rod axis RA may be inclined at an acute angle with respect to the vehicle vertical direction, for example, it may extend inward in the vehicle lateral direction as it extends upward.

[0023] As shown in FIG. 1, the vibration isolator 1 extends along an axis O of the vibration isolator. When the vehicle is stationary, the rod axis RA coincides with the vibration isolator axis O. On the other hand, while the vehicle suspension is moving, the damper rod 121 can swing (pry and displace) around a predetermined swing center point P while changing the angle of the rod axis RA relative to the vibration isolator axis O.

[0024] In this specification, unless otherwise specified, the configuration of the vibration isolation device 1 when the vehicle is stationary will be described. Furthermore, in this specification, unless otherwise specified, the direction parallel to the vibration damping device axis O or rod axis RA is referred to as the "axial direction," the side closer to the vibration damping device axis O or rod axis RA is referred to as the "inner peripheral side," the side farther from the vibration damping device axis O or rod axis RA is referred to as the "outer peripheral side," the circumferential direction centered on the vibration damping device axis O or rod axis RA is referred to as the "circumferential direction," the radial direction centered on the vibration damping device axis O or rod axis RA is referred to as the "radial direction," and the direction perpendicular to the axial direction is referred to as the "axial direction."

[0025] The strut mount portion 13 is attached to the upper end portion of the damper rod 121. In this embodiment, the strut mount portion 13 has a bracket 131, an attachment member 132, and a mount body rubber 133.

[0026] The bracket 131 is made of a rigid body such as metal, and is configured to be attached to the vehicle body. The bracket 131 is configured in an annular shape and has a central through-hole 1313 that passes through the bracket 131 in the axial direction. The central axis of the central through-hole 1313 coincides with the axis O of the vibration isolator. In this embodiment, the bracket 131 has a curved portion 1311 and a flange portion 1312 . A central through-hole 1313 is formed in the center of the curved portion 1311 . The curved portion 1311 is curved convexly downward. The curved portion 1311 is curved along a spherical shape. The center point P of the curved surface shape along which the curved portion 1311 follows is located on the axis O of the vibration isolator. The flange portion 1312 protrudes outward from the upper, outer peripheral end of the curved portion 1311. The flange portion 1312 has a plurality of fastening holes 1314. The flange portion 1312 is configured to be attached to the vehicle body by passing a plurality of fasteners F1 through these fastening holes 1314 and tightening them against the vehicle body. The fasteners F1 are, for example, bolts. However, the bracket 131 may be configured to be attached to the vehicle body by a means other than fastening with the fastener F1.

[0027] The mounting member 132 is made of a rigid body such as metal, and is attached to the upper end of the damper rod 121 . In this embodiment, the mounting member 132 is configured in an annular shape and has a central through-hole 1323 that passes through the mounting member 132 in the axial direction. The central axis of the central through-hole 1323 coincides with the vibration isolation device axis O. Meanwhile, the damper rod 121 has a mounting portion 1211 at its upper end. The mounting portion 1211 has a smaller diameter than the portion of the damper rod 121 below the mounting portion 1211. A male thread is formed on the surface on the outer circumferential side of the mounting portion 1211. The damper rod 121 has a stepped surface 1212 that extends from the lower end of the mounting portion 1211 toward the outer circumferential side and faces upward. The mounting member 132 is configured to be attached to the damper rod 121 by inserting the mounting portion 1211 of the damper rod 121 into the central through hole 1323 of the mounting member 132, and tightening from above with a fastener F2 such as a nut while the lower surface of the mounting member 132 is in contact with the step surface 1212 of the damper rod 121. However, the mounting member 132 may be attached to the damper rod 121 by a structure different from that of this example. In this embodiment, the mounting member 132 has a curved portion 1321 and a mounting portion 1322 . The central through hole 1323 is formed in the center of the mounting portion 1322. The mounting portion 1322 extends parallel to the axial direction. The curved portion 1321 extends from the outer peripheral end of the mounting portion 1322 toward the outer peripheral side. The curved portion 1321 is curved convexly downward. The curved portion 1321 is curved along a spherical shape. The center point P of the curved surface shape along which the curved portion 1321 follows is located on the vibration isolation device axis O. In this embodiment, the mounting member 132 is located at a position spaced below the bracket 131 .

[0028] The mount body rubber 133 is made of rubber and is located between the bracket 131 and the attachment member 132, connecting the bracket 131 and the attachment member 132 to each other. The mount main body rubber 133 and the bracket 131, and the mount main body rubber 133 and the attachment member 132 are fixed together by vulcanization adhesion or the like.

[0029] In this embodiment, the curved portions 1311, 1321 of the bracket 131 and the mounting member 132 are curved along spherical shapes having the same center point P. This makes the center point P of these spherical shapes the elastic center of the mount body rubber 133. As a result, bracket 131 and mounting member 132, which are curved in the same way, are connected to each other via relatively soft mount body rubber 133, so that mounting member 132 and damper rod 121 attached thereto can easily swing (pry) in any direction relative to bracket 131, with center point P as the swing center point. Therefore, when damper rod 121 swings (prys), for example, during a suspension stroke, strut mount section 13 can effectively absorb the prying displacement, thereby reducing interior noise and improving ride comfort.

[0030] The configuration of the strut mount portion 13 is not limited to that described above, but may be any configuration, for example, the same as that of a conventionally known strut mount.

[0031] The suspension spring portion 17 is disposed on the outer periphery side of the expansion portion 12 . In this embodiment, the suspension spring portion 17 is configured as a coil spring made of metal. The upper end of the suspension spring portion 17 is supported from above by the support portion 16. The lower end of the suspension spring portion 17 is supported by a receiving portion (not shown) fixed to the cylinder 122 of the expansion / contraction portion 12. The suspension spring portion 17 is biased in the extension direction.

[0032] The support portion 16 is made of a rigid body such as metal, and is configured to support the upper end of the suspension spring portion 17 via a receiving rubber portion 18 . In this embodiment, the support portion 16 is annular, is disposed on the outer periphery of the damper rod 121, and extends in the direction perpendicular to the axis. However, the shape of the support portion 16 may be arbitrary. In this embodiment, the support portion 16 is located at a position spaced below the strut mount portion 13 .

[0033] The receiving rubber portion 18 is made of rubber and is configured to receive the upper end of the suspension spring portion 17. The receiving rubber portion 18 is located between the support portion 16 and the upper end of the suspension spring portion 17. In this embodiment, the receiving rubber portion 18 has a receiving groove 18g that is open on the outer periphery, and the upper end of the suspension spring portion 17 is fitted into the receiving groove 18g by press-fitting or the like, thereby receiving the upper end of the suspension spring portion 17. This firmly fixes the upper end of the suspension spring portion 17 to the receiving rubber portion 18, effectively preventing the suspension spring portion 17 from slipping due to the reaction force of the rubber portion of the laminate portion 14 or the like. However, the shape of the receiving rubber portion 18 may be arbitrary. The presence of the receiving rubber portion 18 makes it possible to absorb vibrations transmitted from the suspension spring portion 17, and to suppress the transmission of the vibrations to the vehicle body side. In this embodiment, the receiving rubber portion 18 and the support portion 16 are fixed to each other by vulcanization adhesion or the like.

[0034] The laminated portion 14 is cylindrical and disposed on the outer circumferential side of the damper rod 121. The laminated portion 14 is located between the strut mount portion 13 and the support portion 16, and is connected between the strut mount portion 13 and the support portion 16. More specifically, in this embodiment, the laminated portion 14 connects the strut mount portion 13 and the support portion 16. However, additional components may be connected between the strut mount portion 13 and the laminated portion 14 and / or between the support portion 16 and the laminated portion 14. The laminated portion 14 has annular rubber layers 141 and annular rigid layers 142 laminated alternately in the axial direction. The laminated portion 14 has one or more annular rubber layers 141 and one or more annular rigid layers 142. The annular rubber layers 141 and the annular rigid layers 142 are each configured in an annular shape extending over the entire circumference in the circumferential direction. The annular rubber layer 141 is made of rubber. The annular rigid layer 142 is made of a rigid body such as metal. The upper end of the laminated portion 14 is made up of an annular rubber layer 141, and is connected to the strut mount portion 13 (specifically, the attachment member 132). The lower end of the laminated portion 14 is made up of an annular rubber layer 141 and is connected to the support portion 16 . In this embodiment, the annular rubber layer 141 and the annular rigid layer 142, the annular rubber layer 141 and the strut mount portion 13 (specifically, the mounting member 132), and the annular rubber layer 141 and the support portion 16 are fixed together by vulcanization bonding or the like.

[0035] As described above, the laminated portion 14 has low rigidity in the circumferential direction because it has the annular rubber layer 141. As a result, the strut mount portion 13 is supported via the laminated portion 14 so that it can easily rotate about the rod axis line RA relative to the support portion 16. Therefore, for example, rotation of the suspension spring portion 17 about the rod axis line RA when the vehicle turns can be effectively absorbed by the laminated portion 14. Furthermore, the laminated portion 14 has a high rigidity in the vertical direction because it has the annular rigid layer 142. Therefore, it is possible to firmly support the load from the vehicle body side. The laminated portion 14 has the same function as a bearing provided between a strut mount and a support member supporting a coil spring in a conventional vibration isolation device, thereby eliminating the need for a bearing. The laminated portion 14 can be obtained at a lower cost than a bearing and can reduce the number of steps required to assemble the vibration isolation device. Therefore, by providing the laminated portion 14 instead of a bearing, the vibration isolation device 1 can reduce costs and assembly steps while maintaining the same function as a bearing. Furthermore, while dust generally penetrates into a bearing, which can cause poor sliding, leading to poor steering feel and the generation of abnormal noise, the laminated portion 14 does not have such problems. Generally, for relatively inexpensive and lightweight vehicles such as ultra-compact mobility vehicles, there is a strong demand for simple and inexpensive structures. The laminated portion 14 can meet such demands.

[0036] 1, in this embodiment, the laminated portion 14 has a rubber film 143 that covers the inner circumferential surface of each annular rubber layer 141 and each annular rigid layer 142, and the rubber film 143 forms the inner circumferential surface of the laminated portion 14. The rubber film 143 connects the annular rubber layers 141 to each other. Although not shown in the drawings, in addition to or instead of the rubber film 143 on the inner circumferential side, the laminated portion 14 may have a rubber film 143 that covers the outer circumferential surfaces of each annular rubber layer 141 and each annular rigid layer 142 and forms the outer circumferential surface of the laminated portion 14. Furthermore, the laminated portion 14 does not have to have the rubber film 143 on either the inner circumferential side or the outer circumferential side.

[0037] 1, in this embodiment, the inner peripheral surface of the laminated portion 14 is spaced outward from the outer peripheral surface of the damper rod 121. This reduces the contact area between the laminated portion 14 and the damper rod 121, allowing the laminated portion 14 to easily rotate relative to the damper rod 121 in the circumferential direction.

[0038] As shown in Fig. 1, in this embodiment, the stack portion 14 has a plurality of protrusions 144 protruding from the inner peripheral side of its inner peripheral surface. These protrusions 144 are arranged at one or more (two in the example of Fig. 1) axial positions along the circumferential direction at intervals from one another (Fig. 2). The tips of these protrusions 144 contact the outer peripheral surface of the damper rod 121. The presence of these protrusions 144 makes it possible to more reliably maintain the stack portion 14 coaxial with the damper rod 121 while suppressing an increase in the contact area between the stack portion 14 and the damper rod 121. In this embodiment, these protrusions 144 are made of rubber.

[0039] Although not shown in the drawings, the inner peripheral surface of the laminated portion 14 may be in contact with the outer peripheral surface of the damper rod 121 over the entire circumference. In this case, the protrusions 144 may not be necessary. In this case, it is preferable to interpose grease, oil, or the like between the inner peripheral surface of the laminated portion 14 and the outer peripheral surface of the damper rod 121, thereby reducing friction between the laminated portion 14 and the damper rod 121 and allowing the laminated portion 14 to easily rotate and displace in the circumferential direction relative to the damper rod 121.

[0040] The bump rubber portion 19 is made of rubber. The bump rubber portion 19 is cylindrical and is disposed on the outer circumferential side of the damper rod 121. The bump rubber portion 19 is disposed below the support portion 16. The receiving rubber portion 18 is located on the outer circumferential side of the bump rubber portion 19. The lower surface of the bump rubber portion 19 is configured so as to be able to come into contact with the upper end of the cylinder 122 during the expansion and contraction movement of the contact portion 12 . The bump rubber part 19 is configured so that when the cylinder 122 moves upward to a certain extent relative to the damper rod 121, the upper end of the cylinder 122 hits the lower surface of the bump rubber part 19, thereby restricting further upward relative movement of the cylinder 122 (and thus stopping the contraction stroke of the expandable part 12). Because the bump rubber part 19 is made of rubber, it can absorb the impact when the cylinder 122 and the bump rubber part 19 collide. In this embodiment, the outer circumferential surface of the bump rubber portion 19 has a wave shape that oscillates in a direction perpendicular to the axis in a cross section along the axial direction as shown in Fig. 1. However, the shape of the bump rubber portion 19 may be arbitrary. In this embodiment, the inner peripheral surface of the bump rubber portion 19 is spaced outward from the outer peripheral surface of the damper rod 121 . In this embodiment, the bump rubber portion 19 and the support portion 16 are fixed to each other by vulcanization adhesion, etc. The bump rubber portion 19 and the receiving rubber portion 18 are integrally formed.

[0041] 1, in this embodiment, the bump rubber portion 19 is connected to the rubber portion of the laminated portion 14 (more specifically, the rubber film 143 in the example of FIG. 1) via an annular connecting rubber portion 25 that covers the inner peripheral surface of the support portion 16. The inner peripheral surface of the connecting rubber portion 25 is spaced outward from the outer peripheral surface of the damper rod 121. However, the connecting rubber portion 25 does not necessarily have to be provided.

[0042] The dust cover part 20 is made of rubber. The dust cover part 20 is cylindrical and is disposed on the outer periphery of the extension part 12. The dust cover part 20 can protect the extension part 12 from external damage, dust, and the like. In this embodiment, the dust cover part 20 extends downward from the outer peripheral edge of the lower end of the bump rubber part 19. The dust cover part 20 is located between the cylinder 122 and the suspension spring part 17 in the direction perpendicular to the axis. The inner diameter of the dust cover part 20 is larger than the outer diameter of the cylinder 122. In this embodiment, the dust cover part 20 has one or more (multiple in the example of FIG. 1) ribs 201 that protrude outward on its outer circumferential surface. It is preferable that the ribs 201 extend along the circumferential direction. This allows the strength of the dust cover part 20 to be improved even though the dust cover part 20 is made of rubber. However, the dust cover portion 20 may have any configuration.

[0043] In this embodiment, the vibration-damping device 1 includes an integrally molded product 24. The integrally molded product 24 is formed by integrally forming a plurality of components into a single part by rubber injection molding. The rubber in each rubber portion of the integrally molded product 24 is all rubber of the same composition. In this embodiment, the integrally molded product 24 is formed by integrally forming a rubber component and a rigid (metal, etc.) component, and more specifically, includes a strut mount portion 13, a laminated portion 14, a support portion 16, a connecting rubber portion 25, a bump rubber portion 19, a receiving rubber portion 18, and a dust cover portion 20. Because the vibration-damping device 1 includes the integrally molded product 24, it is possible to reduce costs by reducing the number of parts and the number of assembly steps. However, as long as the integrally molded product 24 includes at least one component made of rubber, it may include any multiple components of the rubber vibration isolator 1. Even in such cases, it is possible to reduce costs by reducing the number of parts and assembly steps. Generally, for relatively inexpensive and lightweight vehicles such as ultra-compact mobility vehicles, there is a strong demand for simple and inexpensive structures. The integrally molded product 24 can meet such demands.

[0044] Second Embodiment In each embodiment described herein, the vibration isolation device 1 may include a retaining plate 23, as in the second embodiment shown in Fig. 3. The retaining plate 23 is annular and is attached to the mounting portion 1211 of the damper rod 121. The outer diameter of the retaining plate 23 is larger than the diameter of the central through-hole 1323 of the bracket 131. The retaining plate 23 is located above the central through-hole 1323 of the bracket 131. This prevents the broken or separated portion from coming off the mounting portion 1211 of the damper rod 121 if the strut mount portion 13, the laminated portion 14, or the like, breaks or separates due to poor rubber adhesion or the like. 3, the vibration isolation device 1 includes a cylindrical sleeve 22 provided between the mounting portion 1322 of the mounting member 132 and the retaining plate 23. The retaining plate 23 is sandwiched between the sleeve 22 and the fastener F2.

[0045] Third Embodiment 4 to 6 are diagrams illustrating a vibration-damping device 1 according to a third embodiment of the present invention. The third embodiment differs from the first embodiment mainly in the configurations of the suspension spring portion 17 and the expansion / contraction portion 12. The configurations of the strut mount portion 13 and the laminated portion 14 may be the same as those described above in relation to the first embodiment. The following description will focus on the differences from the first embodiment, with the remaining points remaining the same as those described above in relation to the first embodiment.

[0046] As shown in FIG. 4, in the third embodiment, the suspension spring portion 17 is made of rubber. More specifically, the suspension spring portion 17 has cylindrical rubber layers 171 and cylindrical rigid layers 172 alternately laminated in the radial direction. The suspension spring portion 17 has one or more cylindrical rubber layers 171 and cylindrical rigid layers 172. The cylindrical rubber layers 171 and cylindrical rigid layers 172 are each formed in a cylindrical shape coaxial with the vibration-damping device axis O (and thus with the rod axis RA). Each cylindrical rubber layer 171 is connected between the outer circumferential surface of the cylinder 122 and the outermost cylindrical rigid layer 172a. The cylindrical rubber layers 171 are made of rubber. The cylindrical rigid layers 172 are made of a rigid body such as metal. The inner peripheral end of the suspension spring portion 17 is made up of a cylindrical rubber layer 171, and the inner peripheral surface of the cylindrical rubber layer 171 is connected to the outer peripheral surface of the cylinder 122. The outer peripheral end of the suspension spring portion 17 is made up of a cylindrical rigid layer 172 (hereinafter also referred to as the "outermost cylindrical rigid layer 172a"). The outermost cylindrical rigid layer 172a is disposed at a position spaced away from the expandable portion 12 toward the outer peripheral side. An upper end 172ac of the outermost cylindrical rigid layer 172a is connected to the support portion 16 by being fixed to the outer peripheral end of the support portion 16 by caulking or the like. In this way, the support portion 16 supports the upper end of the suspension spring portion 17. 4, the upper end 171ac of the tubular rubber layer 171a in contact with the inner peripheral surface of the outermost cylindrical rigid layer 172a is interposed between the outer peripheral end of the support part 16 and the upper end 172ac of the outermost cylindrical rigid layer 172a, and is connected to the support part 16 by being fixed to the outer peripheral end of the support part 16 together with the upper end 172ac of the outermost cylindrical rigid layer 172a by caulking or the like. This makes it possible to suppress air leakage at the connecting part between the support part 16 and the suspension spring part 17, thereby improving airtightness. The suspension spring portion 17 is loaded with a weight equivalent to that of the vehicle. In this embodiment, the cylindrical rubber layer 171 and the cylindrical rigid layer 172 are fixed to each other, and the cylindrical rubber layer 171 and the cylinder 122 are fixed to each other by vulcanization adhesion or the like. The suspension spring portion 17 may have only the outermost cylindrical rigid layer 172a as the cylindrical rigid layer 172. In that case, the suspension spring portion 17 has a single-layer structure having only one cylindrical rubber layer 171, and this cylindrical rubber layer 171 connects the outer peripheral surface of the cylinder 122 to the outermost cylindrical rigid layer 172a. However, by having cylindrical rigid layers 172 in other layers in addition to the outermost cylindrical rigid layer 172a to form a laminated structure as in the example of FIG. 4, the rigidity in the direction perpendicular to the axis can be increased.

[0047] In the third embodiment, the expandable portion 12 has a different configuration from that of a conventional shock absorber.

[0048] The damper rod 121 has a solid portion 1213 that is solid, a cylindrical portion 1214 that is cylindrical, and a connecting portion 1215. The outer diameter of the cylindrical portion 1214 is larger than the outer diameter of the solid portion 1213. The upper end of the cylindrical portion 1214 is connected to the lower end of the solid portion 1213 via a connecting portion 1215. The connecting portion 1215 is configured in an annular shape coaxial with the rod axis RA, thereby closing the gap between the solid portion 1213 and the cylindrical portion 1214. The connecting portion 1215 has an upper rod hole 1216 that penetrates the connecting portion 1215 in the axial direction. The lower end face of the cylindrical portion 1214 is open. On the outer circumferential side of the solid portion 1213, the strut mount portion 13, the laminated portion 14, the support portion 16, and the connecting rubber portion 25 are arranged, as in the first embodiment. Since the outer diameter of the cylindrical portion 1214 is larger than the outer diameter of the solid portion 1213, the rigidity of the damper rod 121 can be increased compared to when the outer diameter of the cylindrical portion 1214 is the same as the outer diameter of the solid portion 1213, and thus the rigidity of the kingpin can be increased.

[0049] An upper guide 41 is fixed to the upper end of the cylinder 122. The upper guide 41 is configured in an annular shape that is coaxial with the rod axis RA. The upper guide 41 is fixed to the inner peripheral surface of the cylinder 122 and is in contact with the outer peripheral surface of the cylindrical portion 1214 of the damper rod 121. The upper guide 41 is configured to be slidable on the outer peripheral surface of the cylindrical portion 1214 of the damper rod 121. The upper guide 41 is preferably made of a rigid body such as metal. It is preferable that the inner circumferential surface of the upper guide 41 is coated with a resin such as Teflon, since this allows the upper guide 41 to slide easily on the outer circumferential surface of the cylindrical portion 1214 of the damper rod 121 . In the example of Figure 4, the upper guide 41 covers the upper end surface of the cylinder 122 from above, thereby allowing the upper end of the cylinder 122 to come into contact with the lower surface of the bump rubber part 19 via the upper guide 41 during the extension and retraction operation of the extension / retraction part 12. However, the upper guide 41 does not have to cover the upper end surface of the cylinder 122, and the upper end of the cylinder 122 may be able to directly contact the lower surface of the bump rubber part 19.

[0050] A lower guide 42 is fixed to the lower end of the cylindrical portion 1214 of the damper rod 121. The lower guide 42 is configured in an annular shape coaxial with the rod axis RA. The lower guide 42 is fixed to the outer peripheral surface of the cylindrical portion 1214 of the damper rod 121, and is in contact with the inner peripheral surface of the cylinder 122 so as to be able to slide on the inner peripheral surface of the cylinder 122. The lower guide 42 is located below the upper guide 41. The lower guide 42 is preferably made of a rigid body such as metal. It is preferable that the outer peripheral surface of the lower guide 42 is coated with a resin such as Teflon, since this makes it easier to slide on the inner peripheral surface of the cylinder 122 .

[0051] The upper guide 41 and the lower guide 42 allow the cylinder 122 and the damper rod 121 to move smoothly relative to each other in the axial direction while maintaining a coaxial state.

[0052] A stopper rubber 43 is fixed to the outer circumferential surface of the cylindrical portion 1214 of the damper rod 121, between the upper guide 41 and the lower guide 42. The stopper rubber 43 is made of rubber. The upper surface of the stopper rubber 43 is configured so as to be able to come into contact with the lower surface of the upper guide 41 during the extension and retraction operation of the extension section 12 . The stopper rubber 43 is configured so that when the cylinder 122 moves downward relative to the damper rod 121 to a certain extent, the lower surface of the upper guide 41 comes into contact with the upper surface of the stopper rubber 43, thereby restricting further downward relative movement of the cylinder 122 (and thus stopping the extension stroke of the extension section 12). In this embodiment, the outer peripheral surface of the stopper rubber 43 has a wave shape that oscillates in the direction perpendicular to the axis in a cross section along the axial direction as shown in Fig. 4. However, the shape of the stopper rubber 43 may be arbitrary. In this embodiment, the outer circumferential surface of the stopper rubber 43 is spaced further inward than the inner circumferential surface of the cylinder 122 .

[0053] The internal space of the stretchable portion 12 is filled with air.

[0054] In the third embodiment, similarly to the first embodiment, the lower end of the cylinder 122 is connected to a knuckle (not shown).

[0055] A main air chamber 46 is defined between the support portion 16, the suspension spring portion 17, and the expansion portion 12. The main air chamber 46 is filled with air.

[0056] In the third embodiment, as shown in FIG. 4, the bump rubber portion 19 is located on the outer circumferential side of the upper end portion of the cylindrical portion 1214 of the damper rod 121. The connecting rubber part 25, which connects the rubber part of the laminated part 14 (rubber film 143 in the example of FIG. 4) and the bump rubber part 19, is located on the outer circumferential side of the solid part 1213 of the damper rod 121. The connecting rubber part 25 covers the inner circumferential surface of the support part 16, and also covers the lower surface of the support part 16 on the inner circumferential side of the bump rubber part 19. The connecting part 1215 and the tubular part 1214 of the damper rod 121 are located below the connecting rubber part 25. Gaps exist between the connecting rubber part 25 and the connecting part 1215 and the cylindrical part 1214 of the damper rod 121. Also, a gap exists between the bump rubber part 19 and the cylindrical part 1214 of the damper rod 121. These gaps form a passage 47 that connects the rod upper hole 1216 and the main air chamber 46.

[0057] In the third embodiment, the one-piece molded part 24 has the strut mount part 13, the laminated part 14, the support part 16, the connecting rubber part 25, and the bump rubber part 19. The suspension spring part 17 also constitutes another one-piece molded part 24. By including the one-piece molded part 24, the vibration isolation device 1 can reduce the number of parts and the number of assembly steps, thereby reducing costs.

[0058] In the third embodiment configured as described above, under normal circumstances, as shown in Fig. 5, the upper end of the cylinder 122 (more specifically, the upper surface of the upper guide 41) is spaced downward from the lower surface of the bump rubber part 19. Therefore, the main air chamber 46 becomes an open air chamber via the passage 47, and more specifically, air can flow in and out between the main air chamber 46 and the internal space of the cylindrical part 1214 of the damper rod 121 via the passage 47 and the rod upper hole 1216. On the other hand, when a large compression stroke occurs, for example, when the vehicle goes over a large bump, the upper end of the cylinder 122 collides (eventually comes into contact with) the underside of the rubber bump portion 19 via the upper guide 41, as shown in FIG. 6. In this state, the main air chamber 46 is blocked from the passage 47, and the main air chamber 46 becomes a closed (sealed) space. During this collision, the upper end of the cylinder 122 attempts to compress the rubber bump portion 19 via the upper guide 41, and the portion of the suspension spring portion 17 between the cylinder 122 and the outermost cylindrical rigid layer 172a attempts to displace upward due to inertia and elastic deformation. As a result, the main air chamber 46 is gradually compressed, increasing the internal pressure and thereby performing the function of an air spring. The air reaction force from the main air chamber 46 and the elastic reaction force from the bump rubber portion 19 thus generated absorb the impact when the cylinder 122 and the bump rubber portion 19 collide, and gradually stop the compression stroke of the expandable portion 12. This improves the ride comfort when a large compression stroke occurs.

[0059] Furthermore, in the third embodiment, as described above, the suspension spring portion 17 has a tubular rubber layer 171 connected between the outer peripheral surface of the cylinder 122 and the inner peripheral surface of the outermost cylindrical rigid layer 172a, and the upper end portion 172ac of the outermost cylindrical rigid layer 172a is connected to the support portion 16. This allows the suspension spring portion 17 to easily expand and contract in the vertical direction and also to easily rotate (expand and contract) in the circumferential direction. Therefore, the suspension spring portion 17 of this embodiment has the same function as a conventional coil spring that can constitute, for example, the suspension spring portion 17 of the first embodiment. Therefore, a coil spring is not required. Conventionally, when using a coil spring, it is necessary to provide a structure to firmly secure the upper and lower ends of the coil spring and a guard on the receiving portion that receives the lower end of the coil spring to prevent the coil spring from falling off when it breaks due to corrosion or repeated load application, etc., which may lead to increased cost and weight. The suspension spring portion 17 of this embodiment does not require such a structure, thereby enabling cost and weight reduction. Furthermore, by having the tubular rubber layer 171, the suspension spring portion 17 also has the vibration damping function of a conventional shock absorber, which can constitute, for example, the expansion / contraction portion 12 of the first embodiment. Therefore, a shock absorber (more specifically, a viscous fluid or the like that is generally sealed inside a shock absorber) is not required, and it is not necessary to seal a viscous fluid inside the expansion / contraction portion 12. Furthermore, with the configuration of this embodiment, costs and assembly man-hours can be reduced compared to when a coil spring or shock absorber is used.

[0060] [Fourth embodiment] In each embodiment described in this specification, the vibration isolation device 1 may include a weight 45, as in the fourth embodiment shown in Fig. 7. In the example of Fig. 7, the weight 45 is placed on the support part 16. Generally, due to the characteristics of rubber, the rubber parts of vibration isolation devices tend to become more rigid due to the Payne effect when minute (high-frequency) vibrations such as road noise occur, making it easier for minute vibrations to be transmitted. In this regard, by providing the weight 45 as described above, when minute vibrations such as road noise occur, the weight 45 can effectively absorb the minute vibrations, and the double vibration isolation effect can reduce noise inside the vehicle.

[0061] Fifth Embodiment 8 to 10 are drawings for explaining a vibration-damping device 1 according to a fifth embodiment of the present invention. The fifth embodiment differs from the third embodiment mainly in the configuration of the expansion / contraction section 12. The configurations of the strut mount section 13, laminated section 14, suspension spring section 17, bump rubber section 19, and connecting rubber section 25 may be the same as those described above in relation to the third embodiment. The following description will focus on the differences from the third embodiment, with the remaining points remaining the same as those described above with respect to the third embodiment.

[0062] In the fifth embodiment, the stretchable portion 12 has an upper guide 41 and a stopper rubber 43, similar to the third embodiment, and the configuration thereof may be the same as the third embodiment.

[0063] In the fifth embodiment, the extendable portion 12 has a lower guide 42, similar to the third embodiment. The lower guide 42 is fixed to the lower end of the cylindrical portion 1214 of the damper rod 121. The lower guide 42 is preferably made of a rigid body such as metal. In this embodiment, the lower guide 42 has a lid portion 422 and a pressing portion 421 . The lid portion 422 closes the open end face on the lower side of the cylindrical portion 1214 of the damper rod 121 and the gap between the cylindrical portion 1214 and the cylinder 122. The lid portion 422 is in contact with the inner peripheral surface of the cylinder 122 and is configured to be able to slide on the inner peripheral surface of the cylinder 122. It is preferable that the outer peripheral surface of the lid portion 422 is coated with a resin such as Teflon, as this makes it easier for the lid portion 422 to slide on the inner peripheral surface of the cylinder 122. The pushing portion 421 extends upward from the lid portion 422 between the cylindrical portion 1214 and the cylinder 122. The pushing portion 421 is configured to be able to push the release valve 68.

[0064] The cylindrical portion 1214 of the damper rod 121 has a horizontal hole 1214h that penetrates the cylindrical portion 1214 in the radial direction, between the stopper rubber 43 and the release valve 68 in the axial direction.

[0065] In the fifth embodiment, the expandable portion 12 has a cylinder lid member 64. The cylinder lid member 64 closes the open end face on the lower side of the cylinder 122.

[0066] The interior of the extension / contraction section 12 is divided into an intermediate air chamber 61 and a below-rod air chamber 62 . The intermediate air chamber 61 has an internal space partitioned between the connecting portion 1215 and the lower guide 42 in the axial direction inside the cylindrical portion 1214 of the damper rod 121, and an internal space partitioned between the upper guide 41 and the lower guide 42 in the axial direction between the cylindrical portion 1214 and the cylinder 122, and these internal spaces are connected via the horizontal hole 1214h. The under-rod air chamber 62 is defined inside the cylinder 122 between the lower guide 42 and the cylinder cover member 64 in the axial direction.

[0067] The damper rod 121 and the lower guide 42 function as a piston that slides inside the cylinder 122 as a whole.

[0068] 8, it is preferable to provide a sealing member 63 such as an O-ring between the outer peripheral surface of the lower guide 42 and the inner peripheral surface of the cylinder 122. The sealing member 63 is annular and extends around the entire circumference in the circumferential direction, and is housed in an annular groove formed in the outer peripheral surface of the lower guide 42. This improves the airtightness between the lower guide 42 and the cylinder 122, and can suppress undesired air flow between the intermediate air chamber 61 and the below-rod air chamber 62.

[0069] The lid portion 422 of the lower guide 42 has a through-hole 422h penetrating the lid portion 422. The through-hole 422h connects the intermediate air chamber 61 and the below-rod air chamber 62. A rod one-way valve 65 is provided in the through-hole 422h. The rod one-way valve 65 is configured to allow air to flow from the below-rod air chamber 62 to the intermediate air chamber 61 via the through-hole 422h, but to block air from flowing from the intermediate air chamber 61 to the below-rod air chamber 62 via the through-hole 422h.

[0070] The cylinder lid member 64 has a through-hole 64h that penetrates the cylinder lid member 64. The through-hole 64h connects the under-rod air chamber 62 to the outside of the cylinder 122. A cylinder one-way valve 66 is provided in the through-hole 64h. The cylinder one-way valve 66 is configured to allow air to flow from the outside of the cylinder 122 to the under-rod air chamber 62 via the through-hole 64h, but to prevent air from flowing from the under-rod air chamber 62 to the outside of the cylinder 122 via the through-hole 64h.

[0071] The cylinder 122 has a through hole 122h that penetrates the cylinder 122 in the radial direction. In the example of Fig. 8, the inner surface of the through hole 122h is covered with a cylindrical covering rubber film 69. The covering rubber film 69 is integrally connected to the cylindrical rubber layer 171 of the suspension spring portion 17, but may be configured separately from the cylindrical rubber layer 171. A release valve 68 is provided in the through hole 122h. A covering rubber film 69 is interposed between the inner surface of the through hole 122h and the release valve 68. This makes it possible to suppress undesired air leakage between the through hole 122h and the release valve 68 and improve airtightness. However, the covering rubber film 69 is not necessarily required. The release valve 68 is configured so that when it is pushed from the inner periphery by the pushing portion 421 of the lower guide 42, a gap is formed between the inner surface of the through hole 122h and the release valve 68, thereby connecting the intermediate air chamber 61 to the outside of the cylinder 122.

[0072] The stacked portion 14 has an annular protrusion 145 that protrudes inward from its inner peripheral surface. The annular protrusion 145 is configured in a ring shape that extends around the entire circumference in the circumferential direction. The tip of the annular protrusion 145 contacts the outer peripheral surface of the solid portion 1213 of the damper rod 121. The annular protrusion 145 keeps the stacked portion 14 coaxial with the damper rod 121 and hermetically seals the gap between the stacked portion 14 and the solid portion 1213 of the damper rod 121. In this embodiment, the annular protrusion 145 is made of rubber. The vibration isolator 1 may have a plurality of protrusions 144 in addition to the annular protrusion 145 .

[0073] The fifth embodiment configured as above operates as follows. During the compression stroke, as shown in FIG. 9 , after the cylinder 122 moves upward relative to the damper rod 121, the upper end of the cylinder 122 collides (eventually comes into contact with) the underside of the bump rubber portion 19 via the upper guide 41. While the cylinder 122 moves upward relative to the damper rod 121, the pressure in the below-rod air chamber 62 increases, the rod one-way valve 65 opens, and air flows from the below-rod air chamber 62 to the intermediate air chamber 61 via the rod one-way valve 65. Accordingly, air flows from the intermediate air chamber 61 to the main air chamber 46 via the rod upper hole 1216 and the passage 47. In this way, the telescopic section 12 is configured to send air into the main air chamber 46 during the compression stroke. If this compression stroke is large, for example, when the vehicle goes over a large bump, then, as in the third embodiment, the cylinder 122 collides with (eventually comes into contact with) the bump rubber portion 19 via the upper guide 41, blocking the connection between the main air chamber 46 and the passage 47, and the main air chamber 46 becomes a closed (sealed) space. During this collision, the upper end of the cylinder 122 attempts to compress the bump rubber portion 19 via the upper guide 41, and the portion of the suspension spring portion 17 between the cylinder 122 and the outermost cylindrical rigid layer 172a attempts to displace upward due to inertia and elastic deformation. As a result, the main air chamber 46 gradually compresses, increasing the internal pressure and exhibiting the function of an air spring. The air reaction force from the main air chamber 46 and the elastic reaction force from the bump rubber portion 19 thus generated mitigate the impact when the cylinder 122 and the bump rubber portion 19 collide, and the contraction stroke of the extension / contraction portion 12 is gradually stopped. On the other hand, during the extension stroke, as shown in Figure 10, the pressure in the air chamber 62 below the rod decreases, the cylinder one-way valve 66 opens, and air from the outside flows into the air chamber 62 below the rod through the cylinder one-way valve 66. In this way, while repeating the compression stroke and extension stroke, the vibration damping device 1 continues to pump air into the internal space (main air chamber 46, intermediate air chamber 61, and under-rod air chamber 62) through the pumping action described above, and the pressure in the internal space increases. When the pressure in the internal space (main air chamber 46, intermediate air chamber 61, below-rod air chamber 62) of the vibration damping device 1 rises to a certain level (roughly speaking, when the pressure in the internal space and the reaction force of the suspension spring section 17 exceed the load of the entire vibration damping device 1), the expandable section 12 extends and the pushing section 421 of the lower guide 42 presses the release valve 68, opening it and allowing the air in the main air chamber 46 and intermediate air chamber 61 to flow out. This reduces the pressure in the main air chamber 46 and intermediate air chamber 61. After that, when the pressure in the main air chamber 46 and intermediate air chamber 61 reduces to a certain level, the pushing section 421 of the lower guide 42 moves away from the release valve 68, and the release valve 68 returns to its closed state. In this way, the vibration damping device 1 is designed so that the pressure in the internal space automatically settles within a predetermined pressure range (roughly speaking, a state in which the air reaction force due to the pressure in the internal space and the elastic reaction force of the suspension spring section 17 support the load of the entire vibration damping device 1), thereby making it possible to maintain the vehicle height within a predetermined range. In other words, the vibration damping device 1 has a self-leveling function that automatically adjusts the vehicle height. To achieve this self-leveling function, no external pumps, tanks, control devices, etc. are required, which allows for cost reductions. According to this embodiment, by minimizing the displacement of the suspension spring section 17 and sharing the 1G load burden with the air pressure in the internal space of the vibration damping device 1, changes in vehicle height due to changes in loading, etc. can be suppressed. The predetermined vehicle height range can be adjusted, for example, by adjusting the configuration of the rod one-way valve 65 (for example, the pressing force of the spring inside the rod one-way valve 65).

[0074] In the fifth embodiment, as shown in FIG. 8 , the vibration damping device 1 may include an adjustment valve 67. The adjustment valve 67 is configured to allow pressurized air to be injected from an external pump (not shown) into the internal space of the vibration damping device 1 (the main air chamber 46, the intermediate air chamber 61, and / or the under-rod air chamber 62). As shown in FIG. 8 , for example, the adjustment valve 67 may be provided on a cylinder lid member 64, and configured to allow pressurized air to be injected from an external pump (not shown) into the under-rod air chamber 62. By including the adjustment valve 67, it is possible to adjust the vehicle height by using the adjustment valve 67 to inject pressurized air from an external pump (not shown) into the internal space of the vibration damping device 1 (the main air chamber 46, the intermediate air chamber 61, and / or the under-rod air chamber 62), for example, during initial setup or maintenance.

[0075] Sixth Embodiment In each embodiment described in this specification, when the vibration-damping device 1 has the above-mentioned main air chamber 46, the support portion 16 may have a main air chamber extension portion 16m, as in the sixth embodiment shown in Figure 11. In the example of Fig. 11, the support portion 16 has an inner circumferential side portion 16k and a main air chamber expansion portion 16m. The inner circumferential side portion 16k is connected between the laminated portion 15 and the bump rubber portion 19. The main air chamber expansion portion 16m is located on the outer circumferential side of the inner circumferential side portion 16k and has a generally inverted U-shape that is convex upward in the axial cross section shown in Fig. 11. The upper end of the main air chamber expansion portion 16m is located above the upper end of the inner circumferential side portion 16k. Because the support portion 16 has the main air chamber extension portion 16m, the volume of the main air chamber 46 can be increased, which in turn allows the performance of the air spring function exerted by the main air chamber 46 to be adjusted, thereby improving ride comfort. The inner peripheral side portion 16k and the main air chamber expansion portion 16m may be configured as separate bodies, or may be configured as an integral body.

[0076] The configuration of the vibration isolation device 1 is not limited to that described above, and various modifications are possible. [Industrial Applicability]

[0077] The vibration-damping device according to the present invention is suitable for use in strut-type suspensions, and particularly suitable for use in MacPherson strut-type suspensions. The vibration-damping device according to the present invention can be applied to any type of vehicle, but is particularly suitable for use in relatively inexpensive and lightweight vehicles such as ultra-compact mobility vehicles. [Explanation of symbols]

[0078] 1: vibration isolation device, 12: Telescopic part, 121: damper rod, 1211: mounting portion, 1212: step surface, 1213: solid portion, 1214: cylindrical portion, 1214h: horizontal hole, 1215: connecting portion, 1216: rod upper hole, 122: Cylinder, 122h: Through hole, 13: Strut mount part, 131: bracket; 1311: curved portion; 1312: flange portion; 1313: central through hole; 1314: fastening hole; 132: Mounting member; 1321: Curved portion; 1322: Mounting portion; 1323: Central through hole; 133: Mount body rubber, 1333: Central through hole, 14: Laminated portion, 141: Annular rubber layer, 142: Annular rigid layer, 143: Rubber film, 144: Protrusion, 145: Annular convex portion, 16: Support portion, 16k: Inner peripheral side portion, 16m: Main air chamber expansion portion, 17: suspension spring portion, 171, 171a: cylindrical rubber layer, 171ac: upper end portion, 172: cylindrical rigid layer, 172a: outermost cylindrical rigid layer (cylindrical rigid layer), 172ac: upper end portion, 18: Receiving rubber part, 18g: Receiving groove, 19: Bump rubber part, 20: dust cover part, 201: rib, 21: connecting rubber part, 22: Sleeve, 23: Anti-slip plate 24:Integrated molded product, 25: connecting rubber part, 41: Upper guide, 42: Lower guide, 421: Pressing portion, 422: Lid portion, 422h: Through hole, 43: Stopper rubber, 45: Weight, 46: Main air chamber, 47: Passageway, 61: intermediate air chamber, 62: Air chamber under the rod, 63: Sealing member, 64: Cylinder cover member, 64h: Through hole, 65: Rod one-way valve, 66: Cylinder one-way valve, 67: Adjusting valve, 68: Release valve 69: coated rubber membrane, F1, F2: Fasteners, RA: Rod axis O: Anti-vibration device axis P: Swing center point, center point

Claims

1. 1. A vibration isolation device configured for use in a suspension, comprising: an extendable section having a damper rod and a cylinder; a strut mount portion attached to the damper rod; a suspension spring portion disposed on the outer circumferential side of the expansion and contraction portion; a support portion made of a rigid body configured to support an upper end portion of the suspension spring portion; a laminated portion disposed on an outer circumferential side of the damper rod and connected between the strut mount portion and the support portion; Equipped with The laminated portion has annular rubber layers and annular rigid layers laminated alternately in the axial direction.

2. The vibration isolation device comprises a single-piece molded part, The vibration isolation device according to claim 1 , wherein the single piece comprises the strut mount portion and the laminate portion.

3. 3. The vibration-damping device according to claim 2, wherein the integrally molded product further includes a bump rubber portion disposed on the outer circumferential side of the damper rod and below the support portion.

4. 3. The vibration-damping device according to claim 2, wherein the integrally molded product further includes a dust cover portion made of rubber and disposed on the outer periphery of the expandable portion.

5. The suspension spring portion is an outermost cylindrical rigid layer arranged on the outer peripheral side of the stretchable portion; a cylindrical rubber layer connected between an outer peripheral surface of the cylinder and an inner peripheral surface of the outermost cylindrical rigid layer; and The vibration-damping device according to claim 1 , wherein an upper end of the outermost cylindrical rigid layer is connected to the support portion.

6. the vibration-damping device further includes a bump rubber portion disposed on an outer circumferential side of the damper rod and below the support portion, 6. The vibration-damping device according to claim 5, wherein when the upper end of the cylinder is in contact with the bump rubber portion, the main air chamber defined between the support portion, the suspension spring portion, and the expansion / contraction portion becomes a closed space.

7. 6. The vibration isolation device according to claim 5, wherein the telescopic section is configured to pump air into a main air chamber defined between the support section, the suspension spring section, and the telescopic section during a compression stroke.

8. The strut mount portion is A bracket configured to be attached to a vehicle body side; a mounting member attached to the damper rod; a mount body rubber that connects the bracket and the mounting member together; Equipped with 2. The vibration isolation device according to claim 1, wherein the bracket and the mounting member each have a curved portion that is curved along a spherical shape having the same center point.

Images