Vibration isolation device

Abstract

The present invention provides a vibration isolation device in which a stopper rubber, pre-attached to the bracket, is installed interposed at the points where the brackets come into contact. [Solution] This vibration isolation device comprises a first bracket 11 to which a vibration isolation main body 20 comprising an inner cylinder member 21, an outer cylinder member 22, and a rubber elastic body 23 is attached, and a second bracket 12 having a connecting rod portion 13. The first bracket 11 is attached to the engine frame, and the second bracket 12 is attached to the engine. A stopper rubber 14, which is pre-attached to the second bracket 12 and delivered integrally with the second bracket 12, is interposed between the opening peripheral portion 11b of the mounting hole 11a of the first bracket 11 to which the vibration isolation main body 20 is attached, and the protruding surface base portion 12b from which the connecting rod portion 13 of the second bracket 12 protrudes.

Description

Technical Field

[0001] The present invention relates to a vibration isolator, and particularly to a vibration isolator configured by attaching a first bracket with a vibration isolation body member attached to a mounting hole to either one of a vibration generating part and a vibration receiving part, and attaching a second bracket having a joining rod part to the other one.

Background Art

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

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

[0004] Also, as a component of the vibration isolator, for example, in FIG. 2 of Patent Document 1, a rubber cover 21 which functions as a stopper rubber and is installed intervening between a member 20 such as a mounting bracket on the vibration generating part side and a stopper fitting 9 which is a mounting bracket on the vibration receiving part side is disclosed. 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 which functions as a stopper rubber, thereby exerting a stopper action and being able to relieve vibrations and shocks or suppress the generation of noises and rattling noises without generating a large impact. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 3632690 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] On the other hand, in the vibration isolation device described in Patent Document 1, for example, a component 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 component, a rubber cover 21, and interpose it between the component 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 component 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 in an 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, so that in the assembly process the first bracket and the second bracket are joined together as a single unit, and the stopper rubber be interposed at a predetermined position between the first bracket and the second bracket, making it easy to install.

[0008] One possible method for pre-attaching 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, 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, 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 stopping action, and effectively suppressing the generation of noise and creaking sounds. [Means for solving the problem]

[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 part or a vibration receiving part, 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, in the vibration isolation device of the present invention, it is preferable that the strip-shaped rubber member has locking holes on the short sides of both ends in the longitudinal direction, and that these short sides are bent and each locking hole is locked to a pair of locking protrusions provided on the second bracket, thereby pre-attaching it to the second bracket so as to traverse the protruding base surface.

[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 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 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. [Effects of the Invention]

[0015] 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 that is 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 parts where these brackets come into contact, so as not to fall off, thereby effectively mitigating vibrations and shocks through a stopping action, and effectively suppressing the generation of noise and creaking sounds. [Brief explanation of the drawing]

[0016] [Figure 1] This is a perspective view illustrating a vibration isolation device according to a preferred first embodiment of the present invention. [Figure 2] This is an exploded perspective view illustrating a vibration isolation device according to a preferred first embodiment of the present invention. [Figure 3] This is a perspective view of the main parts illustrating the attachment of the strip-shaped rubber member to the second bracket. [Figure 4] This is a perspective view illustrating a vibration isolation device according to a preferred second embodiment of the present invention. [Figure 5] This is an exploded perspective view illustrating a vibration isolation device according to a preferred second embodiment of the present invention. [Figure 6] This is a perspective view of section A in Figure 4, seen from below. [Modes for carrying out the invention]

[0017] The vibration isolation 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 isolation device 10 of this embodiment is composed of a first bracket 11 to which a vibration isolation 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 isolation device 10, the first bracket 11 and the second bracket 12 are formed as a single unit by inserting the connecting rod portion 13 of the second bracket 12 into the inner cylinder member 21 of the vibration isolation 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.

[0018] Moreover, the vibration isolator 10 of the first embodiment includes an inner cylinder member 21, an outer cylinder member 22, and a rubber elastic body 23 that elastically connects the outer peripheral surface of the inner cylinder member 21 and the inner peripheral surface of the outer cylinder member 22. A vibration isolation main body member 20, which is a so-called rubber ball having a circular cross-sectional shape, is integrally mounted and joined to a mounting hole 11a having a circular hollow cross-sectional shape in a first bracket 11. The vibration isolation device further includes a second bracket 12 having a joining rod portion 13 that protrudes in a cylindrical or columnar shape from a protruding base surface portion 12b and is inserted and joined to the inner cylinder member 21 of the vibration isolation main body member 20 mounted and joined to the first bracket 11. The first bracket 11 is used as either the vibration generating portion or the vibration receiving portion, and is attached to, for example, an engine frame serving as the vibration receiving portion. The second bracket 12 is used as the other portion, and is attached to, for example, an engine serving as the vibration generating portion. In the first embodiment, at least a part of a stopper rubber 14, which is preferably attached to one of the first bracket 11 and the second bracket 12, preferably the second bracket 12, and is incorporated integrally with the second bracket 12, is interposed and disposed so as to be sandwiched between an opening peripheral edge portion 11b (see FIG. 2) of the mounting hole 11a in the first bracket 11 where the vibration isolation main body member 20 is mounted and a protruding base surface portion 12b of the second bracket 12 where the joining rod portion 13 protrudes.

[0019] In addition, in the first embodiment, preferably, the stopper rubber 14 is a strip-shaped rubber member that is pre-attached to the second bracket 12 so as to cross the protruding base surface portion 12b in a state where the joining rod portion 13 of the second bracket 12 is inserted through an insertion opening portion 14a (see FIG. 3). The strip-shaped rubber member 14 is provided with locking holes 14c at end short side portions 14b on both sides in the length direction. By bending these end short side portions 14b and locking the respective locking holes 14c to a pair of locking protrusions 12c provided on the second bracket 12, the strip-shaped rubber member 14 is pre-attached to the second bracket 12 so as to cross the protruding base surface portion 12b.

[0020] In the first embodiment, the first bracket 11 constituting the vibration isolator 10 is preferably a metal bracket made of aluminum, and is preferably formed to have a front shape of a semi-elliptical shape. The straight bottom portion on the side opposite to the arc-shaped portion in the semi-elliptical shape is a flat mounting surface. On the bottom portion of the first bracket 11, an overhanging mounting portion 11c is provided so as to project outward in the central axis direction X of the mounting hole 11a described later and form an overhanging mounting surface continuous with the mounting surface. As a result, the first bracket 11 is placed on, for example, an engine frame serving as a vibration receiving portion in a more stable state, and, for example, a serration bolt or the like is fastened between the engine frame and a fastening hole formed in the overhanging mounting portion 11c, so that the first bracket 11 can be firmly and stably fixed to the engine frame. In a height region on the side opposite to the overhanging mounting portion 11c of the first bracket 11, a mounting hole 11a having a circular hollow cross-sectional shape is formed so as to penetrate through the inner portion along the arc-shaped portion with the thickness direction of the first bracket 11 as the central axis direction X. An anti-vibration main body member 20 having a similar circular outer peripheral shape is fitted and integrally mounted and joined to the mounting hole 11a.

[0021] As described above, the anti-vibration main body member 20 is a known member including 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 metal cylinder made of aluminum and having an outer diameter of, for example, about 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 metal cylinder made of aluminum and having an outer diameter of, for example, about 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 anti-vibration main body member 20, both end portions are arranged so as to slightly project from the opening end surfaces of the outer cylinder member 22 through the rubber elastic body 23.

[0022] 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 interpose between the outer circumferential surface of the inner cylinder member 21 and the inner circumferential surface of the outer cylinder member 22, thereby elastically connecting them. The vibration-damping main body 20 can be easily obtained by vulcanizing the rubber elastic body 23 by insert molding, for example, with the outer cylinder member 22 and the inner cylinder member 21 set 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.

[0023] 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 the ends on both sides of the outer cylinder member 22 are set back slightly from the front and rear surfaces of the first bracket 11, and the ends on both sides of the inner cylinder member 21 protrude slightly from the front and rear surfaces of the first bracket 11, thereby allowing it to be attached integrally to the first bracket 11.

[0024] The second bracket 12, which constitutes the vibration isolation 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.

[0025] 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 portion 12b of the second bracket 12.

[0026] 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, each 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 a stopper rubber.

[0027] 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.

[0028] 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 from the end regions on both sides in the longitudinal direction. Preferably, these thin-walled portions 14e allow the short side portions 14b at both ends in the longitudinal direction of the strip-shaped rubber member 14 to be easily and smoothly bent towards the base portion 12a along the horizontally elongated edge portion of the protruding surface base portion 12b, as shown in Figure 3.

[0029] 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 holes 14c formed in the locking lugs 14d can be locked to the locking projections 12c that protrude from both ends in the transverse direction of the protruding base surface portion 12b of the second bracket 12. 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.

[0030] 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.

[0031] Therefore, according to the vibration isolation device 10 of this first embodiment, the vibration isolation device is configured to include a first bracket 11 to which a vibration isolation main body 20 having a circular cross-sectional shape is integrally attached and joined, and a second bracket 12 having a joining rod portion 13 that is inserted and joined to the inner cylinder member 21 of the vibration isolation main body 20, by using mechanical and physical means, the stopper rubber 14 which is pre-attached to these brackets 11 and 12 without falling off, can be easily and smoothly installed with the stopper rubber 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.

[0032] 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, can also be used as either the vibration generating part or the vibration receiving part, with the joining rod portion 13 protruding from a pair of backward-facing protruding base portions 12b on opposite sides.

[0033] 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 part, as either the vibration generating part or the vibration receiving part, and the second bracket 32 ​​is attached to the engine, which is the vibration generating part, as either the other part. In this second embodiment, at least a portion of the stopper rubber 34, 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.

[0034] 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 of the first bracket 31 and the protruding base portion 32b of the second bracket 32.

[0035] 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.

[0036] 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 at 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 rear 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 to penetrate the first bracket 21 with the thickness direction of the first bracket 21 as the central axis direction X, with the upper half of the hole following the upper arc-shaped portion. A vibration-damping main body 20, which has the same configuration as the one used in the first embodiment described above, is fitted into this mounting hole 31a and attached integrally as a single unit.

[0037] 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.

[0038] 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 the other 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.

[0039] 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).

[0040] 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).

[0041] 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 diagonally opposite to the arc-shaped cutout corners 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 joint 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.

[0042] The back plate 34c of the rubber cover body 34 is a plate-like portion that forms a corner diagonally opposite to the arc-shaped cutout corner, with the other side being connected to it. The back plate 34c has a rectangular back shape that rises from the joint edge with the bottom plate 34b, and a locking tab 34f with a locking hole 34e is attached to the upper edge of the back plate 34c, protruding inward from the rubber cover body 34 so as to be bent, and is connected to it.

[0043] 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 with 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.

[0044] 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 transported and delivered individually 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.

[0045] Therefore, according to the vibration isolation device 30 of this second embodiment, similar to the vibration isolation device 10 of the first embodiment, the vibration isolation device includes a first bracket 31 to which a vibration isolation main body 20 having a circular cross-sectional shape is integrally attached and joined, and a second bracket 32 ​​having a joining rod portion 33 that is inserted and joined to the inner cylinder member 21 of the vibration isolation main body 20. In this vibration isolation device, by using mechanical and physical means, the stopper rubber 34 that is pre-attached to these brackets 31 and 32 can be easily and smoothly installed interposed at predetermined parts where these brackets 31 and 32 come into contact, so that vibrations and shocks can be effectively mitigated by the stopping action of the stopper rubber 34, and the generation of noise and creaking noises can be effectively suppressed.

[0046] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible. For example, the means for mechanically and physically attaching the stopper rubber to either the first bracket or the second bracket does not necessarily have to be by engaging a locking hole formed in the stopper rubber with a locking projection provided on the first bracket or the second bracket, as described above. For example, various other attachment means can be employed, such as a method in which multiple protrusions protruding from the surface of the stopper rubber are pressed into multiple projection-fitting holes provided on the first bracket or the second bracket, corresponding to the positions of each of these multiple protrusions, and the stopper rubber is firmly attached to the first bracket or the second bracket by the circumferential frictional force between these multiple protrusions and projection-fitting holes. [Explanation of symbols]

[0047] 10,30 Vibration Isolator 11,31 First bracket 11a, 31a Mounting holes 11b, 31b Peripheral portion of the opening 11c Overhang mounting section 12, 32 Second bracket 12a Base section 12b,32b Protruding base part 12c Locking protrusion 12d Bolt insertion hole 13,33 Joining rod section 14. Stopper rubber (strip-shaped rubber component) 14a Insertion opening 14b End portion (short side) 14c Locking hole 14d Locking ear 14e Thin section 20 Vibration Isolation Main Unit 21 Inner cylinder member 22 Outer cylinder member 23. Rubber elastic material 31c Bottom part 31d screw hole 31e Chamfered part 31f Locking protrusion 31g Boss part 31h Cylindrical protruding rib 32a Base part 32c Locking protrusion 33c bolt screw hole 34. Stopper rubber (rubber cover) 34a side plate 34b Bottom plate 34c back plate 34d locking opening 34e Locking hole 34f Locking ear 34g arc-shaped portion 35 Serrated Bolts X center axis direction

Claims

1. A vibration isolation device is formed by attaching the first bracket to either a vibration generating part or a vibration receiving part, and attaching the second bracket to either the other, the first bracket being attached to either the vibration generating part or the vibration receiving part, the first bracket being attached to either the vibration generating part or the vibration receiving part, the second A vibration isolation device in which at least a portion of a stopper rubber, which is attached to either the first bracket or the second bracket and delivered integrally with the first bracket or the second bracket, is interposed between the peripheral opening of the mounting hole in the first bracket to which the vibration isolation main body is attached and the protruding base surface of the second bracket from which the connecting rod portion protrudes.

2. The vibration damping 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 on the short sides 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 sides 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, as described in claim 1.

5. The vibration isolation 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 part 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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