Vibration control device

Abstract

Provided is a vibration control device in which stopper rubber attached to a bracket in advance is installed in a state of being interposed at a site where brackets abut on each other. A vibration control device is configured to comprise: a first bracket (11) to which is attached a vibration control body tool (20) provided with an inner cylinder member (21), an outer cylinder member (22), and a rubber elastic body (23); and a second bracket (12) which has a joint rod part (13). The vibration control device is used by attaching the first bracket (11) to an engine frame and attaching the second bracket (12) to an engine. Stopper rubber (14) that is engaged with the second bracket (12) in advance and delivered as an integral part of the second bracket (12) is interposed between an opening peripheral edge portion (11b) of a mounting hole (11a) of the first bracket (11) in which the vibration control body tool (20) is mounted and a protruding surface base part (12b) of the second bracket (12) from which the joint rod part (13) protrudes.

Description

Vibration isolation device

[0001] The present invention relates to a vibration isolation device, and particularly to a vibration isolation device configured by attaching a first bracket to which a vibration isolation body is attached and joined to a mounting hole to either a vibration generating part or a vibration receiving part, and attaching a second bracket having a joining rod part to the other.

[0002] For example, in automobiles, construction machines, etc., vibrations, shocks, noises, rattling noises, etc. are received or generated during driving. Therefore, various types of vibration isolation devices are used to protect automobiles, construction machines, etc. from such vibrations and shocks, or to suppress the generation of noises and rattling noises. As devices for forming mount members such as engine mounts and suspension mounts, they are preferably attached and used at, for example, dozens of locations for each vehicle or machine.

[0003] These vibration isolation devices are preferably manufactured for each component and then sent to, for example, the OEN assembly process, which is a production process, and joined integrally with other components to be attached to a predetermined position of an automobile or a construction machine, thereby exhibiting the function of protecting the automobile, construction machine, etc. from vibrations and shocks or suppressing the generation of noises and rattling noises.

[0004] Further, as a component of the vibration isolation device, for example, in FIG. 2 of Patent Document 1, a rubber cover 21 that functions as a stopper is disclosed, which is installed between a member 20 such as a mounting bracket on the vibration generating part side and a stopper fitting 9 that is a mounting bracket on the vibration receiving part side. When a large vertical displacement occurs in the main body fitting 1 due to the vibration of the vibration generating part, the member 20 such as the mounting bracket on the vibration generating side elastically abuts against the stopper fitting 9 through the rubber cover 21 that functions as a stopper, thereby exerting a stopper action to relieve vibrations and shocks or suppress the generation of noises and rattling noises without generating a large impact.

[0005] US2003 / 0071401A1

[0006] On the other hand, in the vibration isolation device of Patent Document 1, for example, a member 20 such as a mounting bracket on the vibration generating part side and a stopper fitting 9 which is a bracket on the vibration receiving part side to which a main fitting 1 having a rubber vibration isolation base 3 is attached are manufactured as separate parts. Then, preferably in the OEN assembly process, when assembling them as a vibration isolation device, it is necessary to newly incorporate a separate rubber cover 21 and interpose it between the member 20 such as the mounting bracket on the vibration generating part side and the stopper fitting 9 which is the bracket on the vibration receiving part side, thus complicating the assembly process. For this reason, it is preferable to assemble the rubber cover 21, which functions as a stopper rubber, already attached as an integral part to the member 20 such as the mounting bracket and the stopper fitting 9 which is the bracket on the vibration receiving part side, thereby reducing the work in the OEN assembly process and enabling the efficient formation of a vibration isolation device.

[0007] In particular, in a vibration isolation device comprising a first bracket which is integrally attached and joined to an anti-vibration main body having a circular cross-sectional shape and which includes an inner cylinder member, an outer cylinder member, and a rubber elastic body that elastically connects them, and a second bracket which has a joining rod portion that is inserted and joined to the inner cylinder member of the anti-vibration main body, it is desirable that the first bracket and the second bracket be manufactured individually and then joined together integrally in the OEN assembly process to form the vibration isolation device, and that the stopper rubber be pre-fixed and attached to either the first bracket or the second bracket when the device is delivered, and that in the assembly process the first bracket and the second bracket are joined together integrally, the stopper rubber be interposed at a predetermined position between the first bracket and the second bracket so that it can be easily installed.

[0008] One possible method for pre-fixing the stopper rubber to these first and second brackets is to chemically bond them using an adhesive. However, such a chemical method using an adhesive increases the number of work steps involved in manufacturing the first and second brackets, and requires manual application. This raises concerns about the stability of the bond and the reliability of the work, potentially leading to the stopper rubber easily falling off during transportation or delivery of these brackets.

[0009] The present invention provides a vibration isolation device comprising a first bracket that integrally mounts and joins a vibration isolation main body having a circular cross-sectional shape, and which includes an inner cylinder member, an outer cylinder member, and a rubber elastic body elastically connecting them, and a second bracket that has a joining rod portion that is inserted and joined to the inner cylinder member of the vibration isolation main body, wherein, by using mechanical and physical means, a stopper rubber that is pre-attached to these brackets can be easily and smoothly installed with the stopper rubber interposed at predetermined parts where these brackets abut, without falling off, thereby effectively mitigating vibrations and shocks through a stopper action, and effectively suppressing the generation of noise and creaking sounds.

[0010] The present invention provides a vibration isolation device comprising: a first bracket integrally mounted and joined to a mounting hole having a circular hollow cross-section, the vibration isolation main body having a circular cross-sectional shape and comprising an inner cylinder member, an outer cylinder member, and a rubber elastic body elastically connecting the outer circumferential surface of the inner cylinder member and the inner circumferential surface of the outer cylinder member; and a second bracket having a connecting rod portion that protrudes in a cylindrical or cylindrical shape from a protruding base portion, which is inserted and joined to the inner cylinder member of the vibration isolation main body mounted and joined to the first bracket, wherein the first bracket is attached to either a vibration generating portion or a vibration receiving portion, and the second bracket is attached to either the other, wherein at least a portion of a stopper rubber, which is attached to either the first bracket or the second bracket and supplied integrally with the first bracket or the second bracket, is interposed so as to be sandwiched between the opening peripheral portion of the mounting hole in the first bracket to which the vibration isolation main body is mounted and the base portion of the protruding surface from which the connecting rod portion protrudes in the second bracket.

[0011] Furthermore, in the vibration isolation device of the present invention, it is preferable that the stopper rubber is a strip-shaped rubber member that is pre-attached to the second bracket so as to traverse the protruding base surface portion when the connecting rod portion of the second bracket is inserted through the insertion opening.

[0012] Furthermore, it is preferable that the vibration isolation device of the present invention has locking holes in the short side portions of both ends in the longitudinal direction, and that these short side portions are bent and each locking hole is locked to a pair of locking projections provided on the second bracket, thereby pre-attaching the strip to the second bracket so as to traverse the protruding base portion.

[0013] Furthermore, the vibration damping device of the present invention is a rubber cover body with a four-sided three-dimensional shape, comprising a pair of side plates having right-angle portions that are pre-attached to the bottom corner portion of the first bracket, a bottom plate that connects the pair of side plates at one side portion forming the right-angle portion, and a back plate that connects them at the other side portion, and preferably one of the side plates is interposed so as to be sandwiched between the opening peripheral portion of the mounting hole in the first bracket and the protruding base portion of the second bracket.

[0014] Furthermore, in the vibration isolation device of the present invention, a screw hole for screwing a serrated bolt is formed in the bottom surface portion of the bottom corner portion of the first bracket, opening in the central portion of a boss portion that protrudes in a stepped manner from the bottom surface portion, and the rubber cover body is preferably pre-attached to the bottom corner portion of the first bracket by engaging a locking opening formed in the bottom plate with the boss portion and engaging a locking hole formed in the upper edge portion of the back plate with a locking projection provided on the first bracket.

[0015] Figure 1 is a perspective view illustrating a vibration isolation device according to a preferred first embodiment of the present invention. Figure 2 is an exploded perspective view illustrating a vibration isolation device according to a preferred first embodiment of the present invention. Figure 3 is a perspective view of the main part illustrating the attachment of the strip-shaped rubber member to the second bracket. Figure 4 is a perspective view illustrating a vibration isolation device according to a preferred second embodiment of the present invention. Figure 5 is an exploded perspective view illustrating a vibration isolation device according to a preferred second embodiment of the present invention. Figure 6 is a perspective view of part A in Figure 4 viewed from below.

[0016] The vibration damping device 10 according to a preferred first embodiment of the present invention, shown in Figures 1 and 2, is used as a device that constitutes an engine mount, interposed and installed between an engine (not shown), which is a vibration generating part, and an engine frame (not shown), which is a vibration receiving part, in various vehicles such as private cars, enabling damping or absorption of input vibrations. The vibration damping device 10 of this embodiment is configured to include a first bracket 11 to which a vibration damping main body 20 is attached, which is attached to the engine frame, which is a vibration receiving part, as either a vibration generating part or a vibration receiving part, and a second bracket 12, which is attached to the engine, which is a vibration generating part, and has a connecting rod portion 13 protruding from it. In this first embodiment of the vibration damping device 10, the first bracket 11 and the second bracket 12 are formed as an integral part by inserting the connecting rod portion 13 of the second bracket 12 into the inner cylindrical member 21 of the vibration damping main body 20 attached to the first bracket 11. Furthermore, by interposing the stopper rubber 14 at the point where the first bracket 11 and the second bracket 12 come into contact, the stopper rubber 14 can be installed smoothly and reliably in a stable position by mechanical and physical means without the use of adhesive. The stopper action of the stopper rubber 14 effectively mitigates vibrations and shocks, and effectively suppresses the generation of noise and creaking sounds.

[0017] Furthermore, the vibration isolation device 10 of this first embodiment is configured to include a first bracket 11 in which a vibration isolation main body 20, which is a so-called rubber ball having a circular cross-sectional shape and is equipped with an inner cylinder member 21, an outer cylinder member 22, and a rubber elastic body 23 that elastically connects the outer circumferential surface of the inner cylinder member 21 and the inner circumferential surface of the outer cylinder member 22, is integrally mounted and joined to a mounting hole 11a having a circular hollow cross-sectional shape, and a second bracket 12 having a connecting rod portion 13 that protrudes in a cylindrical or cylindrical shape from a protruding base portion 12b and is inserted and joined to the inner cylinder member 21 of the vibration isolation main body 20 mounted and joined to the first bracket 11, and the first bracket 11 is mounted as either a vibration generating part or a vibration receiving part, for example, on an engine frame which is a vibration receiving part, and the second bracket 12 is mounted as the other, for example, on an engine which is a vibration generating part. In this first embodiment, at least a portion of the stopper rubber 14, which is attached to either the first bracket 11 or the second bracket 12 and delivered integrally with the second bracket 12, is interposed between the opening peripheral portion 11b (see Figure 2) of the mounting hole 11a in the first bracket 11 to which the vibration-damping main body 20 is attached, and the protruding base surface portion 12b of the second bracket 12 from which the connecting rod portion 13 protrudes.

[0018] Furthermore, in this first embodiment, the stopper rubber 14 is preferably a strip-shaped rubber member that is pre-attached to the second bracket 12 so as to traverse the protruding base surface portion 12b, with the connecting rod portion 13 of the second bracket 12 inserted through the insertion opening 14a (see Figure 3). The strip-shaped rubber member 14 has locking holes 14c at the short side portions 14b of both ends in the longitudinal direction. By bending these short side portions 14b and engaging each locking hole 14c with a pair of locking projections 12c provided on the second bracket 12, the stopper rubber 14 is pre-attached to the second bracket 12 so as to traverse the protruding base surface portion 12b.

[0019] In this first embodiment, the first bracket 11 constituting the vibration damping device 10 is preferably a metal bracket made of aluminum, and preferably has a semi-elliptical front shape. The straight bottom portion opposite to the arc-shaped portion of the semi-elliptical shape is a flat mounting surface. The bottom portion of the first bracket 11 is provided with an overhanging mounting portion 11c that protrudes outward in the direction of the central axis X of the mounting hole 11a, which will be described later, and forms an overhanging mounting surface that is continuous with the mounting surface. As a result, the first bracket 11 is mounted in a more stable state on, for example, the engine frame which will be the vibration receiving part, and can be firmly and stably fixed to the engine frame by fastening, for example, serration bolts to the fastening holes formed in the overhanging mounting portion 11c between the bracket 11 and the engine frame. On the height region of the first bracket 11 opposite to the protruding mounting portion 11c, a mounting hole 11a with a circular hollow cross-sectional shape is formed in the inner portion of the bracket 11, along the arc-shaped portion, and is opened so as to penetrate through the first bracket 11 with the thickness direction of the first bracket 11 as the central axis direction X. A vibration-damping main body 20 having a similar circular outer circumference shape is fitted into this mounting hole 11a and attached integrally as a single unit.

[0020] As described above, the vibration-damping main body 20 is a known component comprising an inner cylinder member 21, an outer cylinder member 22, and a rubber elastic body 23 that elastically connects them. The outer cylinder member 22 is preferably a cylindrical body made of aluminum, with an outer diameter of, for example, 50 to 100 mm. The outer cylinder member 22 is formed to have a length slightly shorter than the thickness of the first bracket 11. The inner cylinder member 21 is also preferably a cylindrical body made of aluminum, with an outer diameter of, for example, 30 to 50 mm. The inner cylinder member 21 is formed to be slightly longer than the thickness of the first bracket 11, and in a stationary state where no load is applied to the vibration-damping main body 20, it is positioned so that both ends protrude slightly from the open end faces of the outer cylinder member 22 via the rubber elastic body 23.

[0021] The rubber elastic body 23 can be formed using various rubber materials known, for example, as materials for vibration-damping bushings. The rubber elastic body 23 is formed by vulcanization molding to be interposed between the outer circumferential surface of the inner cylinder member 21 and the inner circumferential surface of the outer cylinder member 22, elastically connecting them. The vibration-damping main body 20 can be easily obtained by vulcanizing the rubber elastic body 23 by insert molding with the outer cylinder member 22 and inner cylinder member 21 set, for example, in a mold, similar to conventional vibration-damping main body devices known as rubber balls, consisting of an inner member, an outer member, and a rubber elastic body. During insert molding, it is preferable to form a covering layer that covers the inner circumferential surface and edge of the inner cylinder member 21, similar to conventional vibration-damping main body devices, so that the entire inner cylinder member 21 is embedded inside the elastic body 23.

[0022] The formed vibration-damping main body 20 is fitted into the mounting hole 11a of the first bracket 11, which has a circular hollow cross-sectional shape. The outer cylinder member 22 is bonded or welded to the inner circumferential surface or opening edge of the mounting hole 11a, so that preferably the edges on both sides of the outer cylinder member 22 are slightly recessed from the front and rear surfaces of the first bracket 11, and the edges on both sides of the inner cylinder member 21 are slightly protruding from the front and rear surfaces of the first bracket 11, allowing the main body 20 to be attached integrally to the first bracket 11.

[0023] The second bracket 12, which constitutes the vibration damping device 10, is a metal bracket preferably made of aluminum, similar to the first bracket 11, and is formed to include a base portion 12a having a substantially triangular planar shape with its corners beveled into a curved shape, and a connecting rod portion 13. The connecting rod portion 13 is provided in a state where it protrudes vertically in a cylindrical shape from one side portion that is angled and protrudes from one side of the substantially triangular planar base portion 12a, which is designated as a protruding base surface portion 12b. In addition, the base portion 12a has a plurality of bolt insertion holes 12d that penetrate vertically in the thickness direction. By inserting fixing bolts (not shown) through these bolt insertion holes 12d and fastening them, the second bracket 12 can be firmly fixed to a predetermined position on the engine, for example, which is a vibration generating part.

[0024] Furthermore, in this first embodiment, the connecting rod portion 13 protrudes linearly in the vertical direction from the central portion of the protruding base surface portion 12b, which has a flat, horizontally elongated rectangular shape, with its central axis direction aligned with the central axis direction X of the mounting hole 11a of the first bracket 11. The connecting rod portion 13 is inserted and joined to the inner cylindrical member 21 of the vibration-damping main body 20, which is integrally mounted in the mounting hole 11a of the first bracket 11, with a stopper rubber 14 interposed between the opening peripheral portion 11b of the mounting hole 11a of the first bracket 11 and the protruding base surface portion 12b of the second bracket 12.

[0025] Furthermore, in this first embodiment, locking projections 12c are provided on the back side of both ends in the lateral direction of the protruding base surface portion 12b of the second bracket 12, with each projection protruding. These locking projections 12c are designed to engage with locking holes 14c formed in locking lugs 14d that protrude from the short side portions 14b of both ends in the longitudinal direction of the strip-shaped rubber member 14, which is the stopper rubber.

[0026] In this first embodiment, the stopper rubber 14 constituting the vibration isolation device 10 is a horizontally elongated rectangular strip-shaped rubber member formed using various rubber materials. The stopper rubber 14 made of strip-shaped rubber member has a length that exceeds the horizontal length of the protruding base surface portion 12b of the second bracket 12, and an insertion opening 14a, preferably oval in shape, is formed in its central portion. A locking projection 12c that protrudes vertically from the protruding base surface portion 12b of the second bracket 12 can be inserted through this insertion opening 14a.

[0027] Furthermore, the strip-shaped rubber member 14, which is the stopper rubber, can be provided with one or more thin-walled portions 14e extending in the vertical direction at the end regions on both sides in the longitudinal direction. Preferably, by using these thin-walled portions 14e, as shown in Figure 3, the short side portions 14b at both ends of the strip-shaped rubber member 14 in the longitudinal direction can be easily and smoothly bent toward the base portion 12a along the horizontally elongated edge portion of the protruding surface base portion 12b.

[0028] Furthermore, the strip-shaped rubber member 14, which is the stopper rubber, is provided with locking lugs 14d that protrude further from the edges of the short side portions 14b at both ends in the longitudinal direction, and each lug has a locking hole 14c formed therein. In this first embodiment, preferably, the short side portions 14b at both ends of the strip-shaped rubber member 14 are bent toward the base portion 12a via the thin portion 14e, and the locking lugs 14d with locking holes 14c are provided that protrude from the ends of the protruding base surface portion 12b of the second bracket 12 in the transverse direction. This makes it possible to securely and stably attach the strip-shaped rubber member 14, which is the stopper rubber, to the second bracket 12 in advance by simple mechanical and physical means, preferably covering the entire transverse rectangular protruding base surface portion 12b of the second bracket 12, so as to traverse the protruding base surface portion 12b in the transverse direction.

[0029] Furthermore, according to this first embodiment, the first bracket 11, to which the vibration-damping main body 20 manufactured as described above is integrally attached and joined, and the second bracket 12, to which a strip-shaped rubber member 14, which is a stopper rubber, is easily fixed by mechanical and physical means, are each transported and delivered individually, and preferably joined together as a whole in the OEN assembly process to form the vibration-damping device 10. That is, preferably the second bracket 12 with the stopper rubber 14 still attached is fixed to a predetermined position on the engine, which is the vibration-generating part, for example, and the joining rod portion 13 of the fixed second bracket 12 is inserted and joined to the inner cylinder member 21 of the vibration-damping main body 20, and the first bracket 11 is fixed to a predetermined position on the engine frame, which is the vibration-receiving part, for example. In this way the engine and the engine frame are connected and the vibration-damping device 10 of this first embodiment is provided, and the stopping action of the stopper rubber 14 makes it possible to effectively mitigate vibrations and shocks and effectively suppress the generation of noise and creaking sounds.

[0030] Therefore, according to the vibration isolation device 10 of this first embodiment, the vibration isolation device is configured to include a first bracket 11 which is integrally attached and joined to a vibration isolation main body 20 having a circular cross-sectional shape and comprising an inner cylinder member 21, an outer cylinder member 22, and a rubber elastic body 23 that elastically connects them, and a second bracket 12 which has a joining rod portion 13 that is inserted and joined to the inner cylinder member 21 of the vibration isolation main body 20, and by using mechanical and physical means, the stopper rubber 14 which is attached in advance without falling off these brackets 11 and 12 can be easily and smoothly installed interposed at predetermined parts where these brackets 11 and 12 come into contact, thereby effectively mitigating vibrations and shocks through a stopper action, and effectively suppressing the generation of noise and creaking sounds.

[0031] In addition, in the vibration isolation device 10 of this first embodiment, the first bracket 11, to which the vibration isolation main body 20 is mounted and joined in the mounting hole 11a, can be used as either a vibration generating part or a vibration receiving part, and can be attached in pairs to, for example, an engine frame which serves as the vibration receiving part. The second bracket 12, which is attached to, for example, an engine which serves as the vibration generating part, as the other of either a vibration generating part or a vibration receiving part, can also be used with the joining rod portion 13 protruding from a pair of backward-facing protruding base portions 12b on opposite sides.

[0032] Figures 4 and 5 disclose a vibration isolation device 30 according to a preferred second embodiment of the present invention. The vibration isolation device 30 of this second embodiment, like the vibration isolation device 10 of the first embodiment described above, includes a first bracket 31 in which a vibration isolation main body 20, which is a so-called rubber ball having a circular cross-sectional shape and comprising an inner cylinder member 21, an outer cylinder member 22, and a rubber elastic body 23 that elastically connects the outer circumferential surface of the inner cylinder member 21 and the inner circumferential surface of the outer cylinder member 22, is integrally mounted and joined to a mounting hole 31a having a circular hollow cross-sectional shape, and a second bracket 32 ​​having a connecting rod portion 33 that protrudes in a cylindrical or cylindrical shape from a protruding base portion 32b and is inserted and joined to the inner cylinder member 21 of the vibration isolation main body 20 mounted and joined to the first bracket 31. The first bracket 31 is attached to the engine frame, which is the vibration receiving portion, as either the vibration generating portion or the vibration receiving portion, and the second bracket 32 ​​is attached to the engine, which is the vibration generating portion, as either the other. In this second embodiment, at least a portion of the stopper rubber 34, which is preferably attached to the first bracket 31 and delivered integrally with the first bracket 31, is interposed between the opening peripheral portion 31b of the mounting hole 31a in the first bracket 31 to which the vibration-damping main body 20 is attached, and the protruding surface base portion 32b of the second bracket 32 ​​from which the connecting rod portion 33 protrudes.

[0033] Furthermore, in this second embodiment, the stopper rubber 34 is preferably a rubber cover body with a four-sided three-dimensional shape, consisting of a pair of side plates 34a having right-angle portions that are pre-attached to the bottom corner portion of the first bracket 31, a bottom plate 34b that connects the pair of side plates 34a at one side portion forming the right-angle portion, and a back plate 34c that connects them at the other side portion, and one of the side plates 34a is interposed so as to be sandwiched between the opening peripheral portion 31b of the mounting hole 31a in the first bracket 31 and the protruding base portion 32b of the second bracket 32.

[0034] Furthermore, in this second embodiment, preferably, a screw hole 31d for screwing a serrated bolt 35 into the bottom corner portion 31c of the first bracket 31 is formed opening in the central part of a circular boss portion 31g that protrudes in a stepped manner from the bottom corner portion 31c, as shown in Figure 6. The rubber cover body 34, which is a stopper rubber, is pre-attached to the bottom corner portion of the first bracket 31 by engaging the locking opening 34d formed in the bottom plate 34b with the boss portion 31g, and by engaging the locking hole 34e (see Figures 4 and 5) formed in the upper part of the back plate 34c with a locking projection 31f provided on the first bracket 31.

[0035] In this second embodiment, the first bracket 31 constituting the vibration isolation device 30 is preferably a metal bracket made of aluminum, as shown in Figures 4 and 5, and is preferably formed to have a roughly mountain-shaped front surface, with the upper part curved in an arc shape and a chamfered portion 31e formed perpendicular to the bottom surface portion 31c at one bottom corner. Three screw holes 31d for screwing in serration bolts 35 are preferably formed in the bottom surface portion 31c of the mountain-shaped front surface, and one of these screw holes 31d is formed to open in the central part of a circular boss portion 31g that protrudes in a stepped manner from the bottom surface portion 31c of the bottom corner portion on the side where the chamfered portion 31e is formed (see Figure 6). The other two screw holes 31d are formed to open in the bottom surface of cylindrical projection ribs 31h that are integrally provided, protruding laterally from the front side and the back side, respectively. By screwing serrated bolts 35 into these screw holes 31d, the first bracket 11 can be stably mounted and fixed in a predetermined position on, for example, an engine frame that serves as a vibration receiving part. The first bracket 11 has a mounting hole 31a with a circular hollow cross-sectional shape, which is formed so as to follow the upper half of the upper arc-shaped portion, and penetrates through the first bracket 21 with the thickness direction as the central axis direction X. A vibration-damping main body 20 having the same configuration as that used in the first embodiment described above is fitted into this mounting hole 31a and attached integrally as a single unit.

[0036] Furthermore, in this second embodiment, a locking projection 31f is provided at the bottom corner portion on the side where the chamfered portion 31e is formed, protruding upward from the upper edge portion of the rectangular chamfered portion 31e. A locking hole 34e formed in a locking lug portion 34f (see Figure 5) of the rubber cover body 34, which is a stopper rubber, is locked into this locking projection 31f, as it protrudes inward from the upper edge portion of the back plate 34c.

[0037] The second bracket 32, which constitutes the vibration isolation device 30, is a metal bracket preferably made of aluminum, similar to the first bracket 11, and is formed to include, for example, a base portion 32a having a desired three-dimensional shape that is easy to attach to an engine, and a connecting rod portion 33 that protrudes in a cylindrical shape from a protruding base surface portion 32b, which is one side surface of the base portion 32a. Preferably, the base portion 32a has a plurality of bolt screw holes 33c formed on another side surface perpendicular to the protruding base surface portion 32b, and by inserting and screwing fixing bolts through these bolt insertion holes 33c, the second bracket 32 ​​can be fixed in a position at a predetermined location on the engine, for example, which is a vibration generating part.

[0038] The connecting rod portion 33 is a cylindrical rod portion that protrudes linearly perpendicular to the protruding base surface portion 32b from the side region of the flat protruding base surface portion 32b on one side of the base portion 32a of the second bracket 32. The connecting rod portion 33 is inserted and joined to the inner cylindrical member 21 of the vibration-damping main body 21 of the first bracket 31 with one side plate 34a of the rubber cover body 34, which is a stopper rubber, interposed between the opening peripheral portion 31b of the mounting hole 31a of the first bracket 31 and the protruding base surface portion 32b of the second bracket 32 ​​(see Figure 4).

[0039] In this second embodiment, the stopper rubber 34 constituting the vibration isolation device 30 is formed as a four-sided three-dimensional rubber cover body using various rubber materials, as described above. It consists of a pair of side plates 34a having right-angle portions, a bottom plate 34b connecting these side plates 34a at one side forming the right-angle portion, and a back plate 34c connecting them at the other side. Each of the pair of side plates 34a has a shape in which one corner of a rectangular flat plate is preferably cut out in an arc shape. When the rubber cover body 34 is attached to the bottom corner portion on the side where the chamfered portion 31e of the first bracket 31 is formed, the cut-out arc-shaped portion 34g is positioned along the peripheral edge of the circularly opening mounting hole 31a of the first bracket 31 (see Figure 4).

[0040] The bottom plate 34b of the four-sided three-dimensional rubber cover body 34 is a plate-like portion that is positioned to connect one side of the bottom edge to the other, forming a corner portion diagonally opposite to the arc-shaped cutout corner portions of the pair of side plates 34a. As shown in Figure 6, a locking opening 34d is formed in this bottom plate 34b, cut in a semi-elliptical shape from the joining edge with the back plate 34c toward the opposite side of the back plate 34c. The semi-circular portion of the locking opening 34d opposite the back plate 34c is curved in an arc shape with a radius similar to that of the circular boss portion 31g that protrudes in a stepped manner from the bottom surface portion 31c of the bottom corner portion of the first bracket 31. This makes it possible to stably lock the locking opening 34d of the bottom plate 34b to the circular boss portion 31g when the rubber cover body 34 is attached to the bottom corner portion of the first bracket 31 on the side where the chamfered portion 31e is formed.

[0041] The back plate 34c of the rubber cover body 34 is a plate-like portion that is arranged so as to connect the other side to the corner portion that is diagonally opposite to the arc-shaped cutout corner portion. The back plate 34c has a rectangular back shape that rises from the joint edge with the bottom plate 34b, and a locking lug portion 34f with a locking hole 34e is attached to the upper edge of the back plate 34c, which is bent inward into the rubber cover body 34.

[0042] The rubber cover body 34, which is a stopper rubber, has a four-sided three-dimensional shape formed by a pair of side plates 34a, a bottom plate 34b, and a back plate 34c, with two sides, the front and top, being open. The bottom corner portion on the side where the chamfered portion 31e of the first bracket 31 is formed is attached to the inside of this four-sided three-dimensional shape, and the bottom plate 34b is placed on top of the bottom portion 31c where the boss portion 31g of the bottom corner portion is provided, and its locking opening 34d is locked to the boss portion 31g. Furthermore, by simply overlapping the back plate 34c onto the chamfered portion 31e in this state, and engaging the locking holes 14c of the locking lugs 34f connected to the upper edge portion of the back plate with the locking projections 31f that protrude upward from the upper edge portion of the chamfered portion 31e on the first bracket 31, the rubber cover body 34 can be firmly and stably attached to the bottom corner portion of the first bracket 11 in advance by a simple mechanical and physical means.

[0043] Furthermore, according to this second embodiment, the vibration-damping main body 20 manufactured as described above is integrally attached and joined to the first bracket 31, to which a rubber cover body 34, which is a stopper rubber, is easily fixed by mechanical and physical means, and the second bracket 32 ​​are each individually transported and delivered, and preferably joined together integrally in the OEN assembly process to form the vibration-damping device 30. That is, for example, the second bracket 32 ​​is fixed to a predetermined position on the engine which is the vibration generating part, and for example, the joining rod portion 33 of the fixed second bracket 32 ​​is inserted and joined to the inner cylinder member 21 of the vibration-damping main body 20, and the first bracket 31, to which the rubber cover body 34, which is a stopper rubber, is pre-attached to the bottom corner portion, is fixed to a predetermined position on the engine frame which is the vibration receiving part. This connects the engine and the engine frame, providing the vibration damping device 30 of this second embodiment. Similar to the vibration damping device 10 of the first embodiment described above, the stopper action of the stopper rubber 14 effectively reduces vibrations and shocks, and effectively suppresses the generation of noise and creaking sounds.

[0044] Therefore, according to the vibration isolator 30 of the second embodiment, similar to the vibration isolator 10 of the first embodiment, it includes an inner cylinder member 21, an outer cylinder member 22, and a rubber elastic body 23 that elastically connects them, and a first bracket 31 integrally attached and joined with a vibration isolation main body tool 20 having a circular cross-sectional shape, and a second bracket 32 having a joining rod portion 33 inserted and joined to the inner cylinder member 21 of the vibration isolation main body tool 20. In the vibration isolator configured to include these, by using mechanical and physical means, the stopper rubber 34 that is pre-attached without falling off from these brackets 31, 32 can be easily and smoothly installed in a state where it is interposed at a predetermined portion where these brackets 31, 32 abut against each other, so that the stopper action by the stopper rubber 34 can effectively mitigate vibrations and impacts, or effectively suppress the generation of noise and rattling sounds.

[0045] In addition, the present invention is not limited to the above-described respective embodiments, and various modifications are possible. For example, the means for mechanically and physically attaching the stopper rubber to either one of the first bracket and the second bracket does not necessarily have to be, as described above, by locking the locking hole formed in the stopper rubber to the locking projection provided on the first bracket or the second bracket. For example, a plurality of protruding portions protruding from the surface of the stopper rubber are respectively fitted into a plurality of protruding portion fitting holes provided on the first bracket or the second bracket corresponding to the positions of each of these plurality of protruding portions by pushing them in, and the stopper rubber is firmly attached to the first bracket or the second bracket by the circumferential surface frictional force between these plurality of protruding portions and the protruding portion fitting holes. Other various attachment means such as this method can be adopted.

[0046] The vibration isolation device of the present invention comprises a first bracket that integrally mounts and joins a vibration isolation main body having a circular cross-sectional shape, which includes an inner cylinder member, an outer cylinder member, and a rubber elastic body elastically connecting them, and a second bracket that has a joining rod portion inserted and joined to the inner cylinder member of the vibration isolation main body. By using mechanical and physical means, stopper rubbers that are pre-attached to these brackets can be easily and smoothly installed with the stopper rubbers interposed at predetermined locations where these brackets come into contact, thereby effectively mitigating vibrations and shocks through a stopping action, and effectively suppressing the generation of noise and creaking sounds.

Claims

1. A vibration isolation device comprising: a first bracket integrally mounted and joined to a mounting hole having a circular hollow cross-section, the first bracket comprising an inner cylinder member, an outer cylinder member, and a rubber elastic body elastically connecting the outer circumferential surface of the inner cylinder member and the inner circumferential surface of the outer cylinder member, and a vibration isolation main body having a circular cross-sectional shape; and a second bracket having a connecting rod portion that protrudes in a cylindrical or cylindrical shape from a protruding base portion, which is inserted and joined to the inner cylinder member of the vibration isolation main body mounted and joined to the first bracket, wherein the first bracket is attached to either a vibration generating portion or a vibration receiving portion, and the second bracket is attached to either the other, wherein at least a portion of a stopper rubber, which is attached to either the first bracket or the second bracket and supplied integrally with the first bracket or the second bracket, is interposed so as to be sandwiched between the opening peripheral portion of the mounting hole on the first bracket to which the vibration isolation main body is mounted and the protruding base portion on which the connecting rod portion protrudes of the second bracket.

2. The vibration isolation device according to claim 1, wherein the stopper rubber is a strip-shaped rubber member that is pre-attached to the second bracket so as to traverse the protruding base surface when the connecting rod portion of the second bracket is inserted through the insertion opening.

3. The vibration isolation device according to claim 2, wherein the strip-shaped rubber member is provided with locking holes in the short side portions of both ends in the longitudinal direction, and is pre-attached to the second bracket so as to traverse the protruding base portion by bending these short side portions and engaging each locking hole with a pair of locking projections provided on the second bracket.

4. The stopper rubber is a four-sided three-dimensional rubber cover body comprising a pair of side plates having right-angle portions that are pre-attached to the bottom corner portion of the first bracket, a bottom plate that connects the pair of side plates at one side portion forming the right-angle portion, and a back plate that connects them at the other side portion, wherein one of the side plates is interposed between the opening peripheral portion of the mounting hole in the first bracket and the protruding base portion of the second bracket.

5. The vibration damping device according to claim 4, wherein a screw hole for screwing a serrated bolt is formed in the bottom surface of the bottom corner portion of the first bracket, opening in the central portion of a boss portion that protrudes in a stepped manner from the bottom surface portion, and the rubber cover body is pre-attached to the bottom corner portion of the first bracket by engaging a locking opening formed in the bottom plate with the boss portion and engaging a locking hole formed in the upper edge portion of the back plate with a locking projection provided on the first bracket.

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