JP2005344764A - Vibration control bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a vibration control bush having soft spring rigidity in the twisting and wrenching direction while having high rigidity in spring rigidity in the direction perpendicular to the axis. <P>SOLUTION: This vibration control bush has a rigid outer cylinder 32, an inner cylinder 34 and an intermediate rubber elastic body 36 for connecting these cylinders, and is constituted by forming an outer peripheral surface shape of the inner cylinder 34 in a bulge shape of swelling outward in a central part in the shaft direction. An inner peripheral surface shape of the outer cylinder 32 is formed in a recessed curved shape along the bulge shape. An inner diameter D<SB>1</SB>of both ends in the shaft direction is formed in a diameter smaller than a maximum diameter D<SB>2</SB>of a central part of the bulge shape. The outer cylinder 32 is constituted by adjusting half bodies 32-1 and 32-2 formed by being divided into two parts in the shaft direction in the central part in the shaft direction to the shaft direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anti-vibration bush, and more particularly to an anti-vibration bush having a rigid inner cylinder whose outer peripheral surface has a bulge shape.

Conventionally, anti-vibration bushes including a rigid outer cylinder, an inner cylinder, and an intermediate rubber elastic body that elastically connects them have been widely used as suspension bushings, torque rod bushings, and the like for vibration insulation.
Conventionally, as an anti-vibration bush, the outer peripheral surface of the inner cylinder has a bulge shape in which the outer diameter gradually increases from both axial end portions toward the central portion and bulges outward in the radial direction. It is.

For example, Patent Document 1 below discloses a vibration isolating bush including an inner cylinder having such a bulge shape.
In this way, if the outer peripheral surface shape of the inner cylinder is a bulge shape, the thickness of the rubber elastic body can be reduced, and the spring constant in the direction perpendicular to the axis can be set to a high spring constant, that is, the spring rigidity can be increased. it can.

Therefore, the anti-vibration bush having the bulge shape on the outer peripheral surface of the inner cylinder as described above is applied to those requiring high spring rigidity in the direction perpendicular to the axis.
An example of such an anti-vibration bush is a bush of a torque rod that is interposed between the engine side and the body side of the vehicle and regulates the displacement in the roll direction and the displacement in the front-rear direction of the engine.

Conventionally, a torque having a small bush at one end and a large bush at the other end respectively provided with a rigid outer cylinder and an inner cylinder and an intermediate rubber elastic body connecting them in a vehicle, and a rigid connecting portion connecting them. The rod is interposed between the engine side and the body side of the vehicle, the torque from the engine is received by the torque rod, the displacement in the roll direction of the engine is regulated, and the displacement in the front-rear direction is also regulated. Has been done.
The torque rod also has a function of vibration isolation between the engine side and the body side.

FIG. 7 shows an example of a conventionally known torque rod (Patent Document 2 below).
In the figure, reference numerals 200 and 202 denote a small bush and a large bush having rigid inner cylinders 204 and 206, outer cylinders 208 and 210, and intermediate rubber elastic bodies 212 and 214 for connecting them, and a connecting rod (connecting portion). They are connected at 216.

In the torque rod, one of the small bush 200 and the large bush 202 is elastically coupled to the engine side in the vehicle and the other is elastically coupled to the body side, and receives the torque from the engine while elastically deforming the rubber elastic bodies 212 and 214. The displacement in the roll direction and the displacement in the front-rear direction are regulated.
Further, vibration insulation is performed between the engine side and the body side based on the elastic deformation of the rubber elastic bodies 212 and 214.

In the such torque rod required to a high rigidity of the spring rigidity in the axial direction perpendicular to the small bush 200 (longitudinal direction of the roll direction and the vehicle of a direction indicated by 8 in P ₂ Engine) It has been.
Therefore, in such a torque rod, as shown in FIG. 8, the inner cylinder 220 on the small bush 218 side has a bulge shape, more specifically, the outer peripheral surface shape gradually increases in diameter from both axial end portions toward the central portion. Thus, a shape that bulges outward in the radial direction is performed.

On the other hand a small bush 218 of the torque rod, the left-right direction in which the engine side and the body side relative motion to the left and right, more information and a inner cylinder 220 and outer cylinder 208 of which as small bushing 218 indicated by the arrows P ₁ direction relative rotational movement about the axis (twisting direction of the rubber elastic body 212), and the vertical direction of the vehicle indicated by an arrow P _3, details the engine side and the body side relative motion is performed in the vertical direction, the rubber The spring stiffness in the direction in which the axis of the inner cylinder 220 is inclined with respect to the elastic body 212 is required to be as soft as possible.

  Thus, by softening the spring rigidity in the left and right direction and the vertical direction, that is, the spring rigidity in the torsional direction and the twisting direction in the rubber elastic body 212, vibration-proof performance, that is, soundproof performance against various vibrations including idle vibration. Can be high.

  On the other hand, in the case of the small bush 218 of the torque rod shown in FIG. 8, the distance between the inner cylinder 220 and the outer cylinder 208 is relatively wide at both ends in the axial direction. In addition, the elasticity of the rubber elastic body 212 is not uniform in the axial direction and the thickness of the central portion is partially thinner than both ends. There is a problem that the load is concentrated on the central portion of the body 212, which is disadvantageous in terms of durability.

In addition, although the point which made the inner peripheral surface shape of the outer cylinder the concave curved shape according to the bulge shape of the inner cylinder is disclosed in Patent Document 1, in the one disclosed in Patent Document 1, the axial direction of the outer cylinder is disclosed. The inner diameters at both ends are not sufficiently small, and this is insufficient to meet the above requirements.
However, in the one disclosed in Patent Document 1, the inner diameter of the central portion in the axial direction of the outer cylinder and the inner diameter of both ends are further reduced, and the inner diameter of both ends is smaller than the maximum diameter of the central portion of the bulge shape of the inner cylinder. However, in this case, there is a problem in that the manufacturing process of the bush is complicated and the manufacturability deteriorates, and the cost increases accordingly.

  Although a small bush in a torque rod has been described as an example, the same problem also applies to bushes for various other applications that require high spring rigidity in the direction perpendicular to the axis and soft spring rigidity in the torsional and twisting directions. have.

JP-A-9-203428 JP-A-57-191129

  The present invention is based on the above circumstances, and provides an anti-vibration bushing having a low spring stiffness in the direction perpendicular to the axis and a soft spring stiffness in the torsional and twisting directions of the rubber elastic body at low cost. It was made for the purpose.

  Thus, the present invention has a rigid outer cylinder, an inner cylinder, and an intermediate rubber elastic body connecting them, and the inner cylinder has an outer peripheral surface shape extending from both axial end portions to the central portion. In the anti-vibration bush formed in a bulge shape that increases in outer diameter and bulges outward in the radial direction, the outer cylinder is configured such that the inner peripheral surface shape of the outer cylinder extends from the axial center along the bulge shape. The inner diameter decreases toward both ends to become a small diameter, and the inner diameter at both ends in the axial direction has a concave shape that is smaller than the maximum diameter of the central portion of the bulge shape. A half body divided into two in the axial direction in the central portion of each is configured in accordance with the axial direction.

  According to a second aspect of the present invention, in the first aspect, a pair of halves constituting the outer cylinder are vulcanized and bonded together with the rubber elastic body.

  According to a third aspect of the present invention, in any one of the first and second aspects, the anti-vibration bush includes a small bush at one end and a large bush at the other end provided with a rigid outer cylinder, an inner cylinder, and an intermediate rubber elastic body, respectively. The small bush of the torque rod is provided with a bush and a rigid connecting portion for connecting them, and is interposed between the engine side and the body side of the vehicle.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the torque rod is configured such that the connecting portion is formed by overlapping a pair of rigid plates that are symmetrical with each other, and one small plate includes the small bush. One half of the outer cylinder in the large bush and one half of the outer cylinder in the large bush, and the other half of the outer cylinder in the small bush and the other half of the outer cylinder in the large bush The body is integrally formed, and the connecting portions of the torque rods and the outer cylinders of the small bush and the large bush are configured by overlapping the plate bodies.

  According to a fifth aspect of the present invention, in any one of the third and fourth aspects, the plate body is formed of a metal press-worked product.

Effects and effects of the invention

As described above, according to the present invention, the inner peripheral shape of the outer cylinder in the vibration-isolating bushing has an inner diameter that decreases from the axial center to both ends along the bulge shape of the inner cylinder, and the inner diameter of both ends in the axial direction. The outer cylinder is divided into a pair of halves at the central part in the axial direction, and the outer cylinder is aligned with the axial direction. Is configured.
Here, the concave shape of the outer cylinder can be preferably a concave shape in which the inner diameter gradually decreases from the axial center to both ends.

In the present invention, a pair of halves formed by dividing the outer cylinder into two in the axial direction are configured in accordance with the axial direction. Therefore, the inner peripheral surface shape of the outer cylinder has a bulge shape at the inner diameters of both axial ends. It can be easily formed into a concave curved shape along the bulge shape so as to be smaller than the maximum diameter.
Thus, by enabling the outer cylinder to have such a concave curved shape, the spring rigidity in the torsional direction and the twisting direction can be sufficiently softened while maintaining the spring rigidity in the direction perpendicular to the axis sufficiently high. Can do.
Thereby, idle vibration and other vibrations can be sufficiently absorbed by the elastic deformation of the rubber elastic body of the bush, and the soundproofing performance can be enhanced.

In addition, since the thickness of the rubber elastic body can be equalized along the bulge shape of the inner cylinder, even when a load in the direction perpendicular to the axis is repeatedly applied to the rubber elastic body, a locally large load is applied to the rubber elastic body. Can be solved, and the load can be evenly distributed throughout the rubber elastic body.
As a result, the durability against the repeated action of the load in the direction perpendicular to the axis can also be enhanced as compared with the prior art.

  In the present invention, after setting one half of the outer cylinder in a rubber elastic vulcanization mold, set the inner cylinder whose outer peripheral surface has a bulge shape, and then setting the other half of the outer cylinder By setting, the inner cylinder and the outer cylinder can be satisfactorily set in such a vulcanization mold, and the inner diameter of both ends in the axial direction of the outer cylinder is smaller than the maximum diameter of the bulge shape of the inner cylinder. Even in this case, it is possible to easily manufacture such a vibration isolating bush at a low cost by a simple manufacturing process.

In the present invention, the pair of halves constituting the outer cylinder can be vulcanized and bonded together with the rubber elastic body (claim 2).
In this way, even when the outer cylinder is divided into a pair of halves, an additional step of joining the halves together to form the outer cylinder is not required, and the rubber elastic body is added. The advantage that the pair of halves are integrated via the rubber elastic body at the same time as the sulfur molding is obtained.

The present invention is particularly suitable for application to a small bush of a torque rod (claim 3).
Further, in this case, the torque rod is formed so that a pair of rigid plates are superposed to form a connecting portion, and one plate is provided with one half of the outer cylinder of the small bush and the outer of the large bush. One half of the cylinder and the other half of the outer cylinder of the small bush and the other half of the outer cylinder of the large bush can be formed integrally with the other plate. In this case, the connecting parts of the torque rods and the outer cylinders of the small bush and the large bush can be configured at the same time by superimposing the plate bodies (Claim 4), and the production of the torque rod including the bushes can be performed in a simple process. It can be done inexpensively.

In this case, the plate can be made of a metal press-processed product (Claim 5).
In this case, the plate body in the connecting portion and the half of the outer cylinder in each bush can be formed integrally by simply pressing one plate material.

Next, an embodiment when the present invention is applied to a small bush of a torque rod will be described in detail with reference to the drawings.
In FIG. 1, 10 is a suspension member (body) of a vehicle, and 12 is an engine elastically supported on the suspension member 10 via a left engine mount 14 and a right engine mount 16.
However, the engine mounts 14 and 16 support the weight of the entire power unit 20 formed by assembling the engine 12 and the transmission 18.

Reference numeral 22 denotes a torque rod interposed between the center frame 24 of the suspension member 10 and the lower portion of the engine 12, and includes a small bush 26 and a large bush 28, and a rigid connecting portion 30 for connecting them in the front-rear direction. It is made up.
The torque rod 22 has a small bush 26 elastically coupled to the engine 12 and a large bush 28 elastically coupled to the center frame 24 of the suspension member 10.

  Here, an inner cylinder 34 to be described later is fastened to the engine 12 on the small bush 26 side, and an inner cylinder 42 is fastened and fixed to the center frame 24 of the suspension member 10 on the large bush 28 side by bolts and nuts, respectively.

The configuration of the torque rod 22 is specifically shown in FIGS.
3 and 4, the small bush 26 has a metal-made rigid outer cylinder 32 and inner cylinder 34, and an intermediate cylindrical rubber elastic body 36 connecting them, which are vulcanized. They are fixed together by bonding.
A flange-like portion 38 is formed in a semicircular shape on the outer peripheral side of the small bush 26.

On the other hand, the large bush 28 also has a metal-made rigid outer cylinder 40 and inner cylinder 42, and a rubber elastic body 44 that is integrally fixed thereto by vulcanization bonding.
However, on the large bush 28 side, the rubber elastic body 44 has a form having a pair of elastic legs 46 which are expanded in a V shape from the inner cylinder 42 side.

On the large bush 28 side, a metal rigid and ring-shaped intermediate plate 48 is disposed so as to surround the inner cylinder 42.
Straight portions 50 and 52 are provided at the front and rear positions of the intermediate plate 48, specifically, at the left and right positions in the drawing.

The inside of the intermediate plate 48 is filled with rubber, and a void portion 62 is partially provided. This void portion 62 has the following meaning.
That is, if the entire inner side of the intermediate plate 48 is filled with rubber, a tensile force acts on the adhesive interface during shrinkage after vulcanization, and the tensile force tends to cause peeling at the adhesive interface or cracks in the rubber. Become.
Therefore, by providing the void portion 62, the deformation of the rubber inside the intermediate plate 48 is allowed at the time of contraction after vulcanization, thereby suppressing or preventing the tensile force from acting on the adhesion interface or the like. .

  Between the left portion of the intermediate plate 48 in the drawing and the outer cylinder 40, a rubber stopper portion 64 is provided that acts as a stopper during deceleration, and between the right portion and the outer tube 40 in the drawing. Is provided with a rubber stopper portion that acts as a stopper during acceleration.

  In the present embodiment, a central first rubber stopper portion 66 positioned opposite to the intermediate plate 48 as the rubber stopper portion, and a second rubber stopper portion positioned on both sides thereof and facing each of the pair of elastic legs 46. 68 are provided inside the straight portion 52.

In this embodiment, the first rubber stopper portion 66 and the second rubber stopper portion 68 are each formed in a cross-sectional mountain shape with substantially the same protruding height.
Also on the large bush 28 side, a flange portion 70 is formed in a semicircular shape on the outer peripheral side thereof.

  As shown in FIGS. 4 and 5, the inner cylinder 34 of the small bush 26 has an outer peripheral surface whose outer diameter gradually increases from both axial end portions toward the central portion, and the drum is radially outward. It has a bulge shape that bulges into a shape. In the figure, 54 represents the bulge portion.

On the other hand, the outer cylinder 32 has a shape corresponding to the curved shape along the outer peripheral surface of the bulge portion 54.
Specifically, the outer cylinder 32 has a concave curved shape in which the inner peripheral surface shape gradually decreases from the central portion in the axial direction to the both ends to become a small diameter, and the inner peripheral surface is curved along the outer peripheral surface of the bulge portion 54. Has been.
As a result, the rubber elastic body 36 between the inner cylinder 34 and the outer cylinder 32 has a substantially uniform thickness T (see FIG. 5) from one end portion to the other end portion in the axial direction. .

In this embodiment, as shown in detail in FIG. 5, the outer cylinder 32 has an inner diameter D ₁ at both ends in the axial direction smaller than the maximum outer diameter D _{2 at} the center of the bulge portion 54.

In the present embodiment, the outer cylinder 32 is divided into two halves 32-1 and 32-2 at the central portion in the axial direction, and the entire outer cylinder 32 is configured by matching them in the axial direction. .
Here, the half bodies 32-1 and 32-2 are symmetrical in the vertical direction in the figure.
In the present embodiment, the pair of halves 32-1 and 32-2 constituting the outer cylinder 32 are integrally vulcanized and bonded to the rubber elastic body 36, and the pair of halves 32- 1,32-2 are integrated.

On the other hand, as shown in FIG. 4, the outer cylinder 40 is also divided into a pair of halves 40-1 and 40-2 at the central portion in the axial direction on the large bush 28 side. Thus, the entire outer cylinder 40 is configured.
Also in the large bush 28, the pair of half bodies 40-1 and 40-2 are symmetrical in the vertical direction in the figure.

However, the inner cylinder 42 of the large bush 28 has a cylindrical shape in which the outer peripheral surface forms a straight shape in the axial direction.
Correspondingly, the outer cylinder 40 has a cylindrical shape in which both the inner peripheral surface and the outer peripheral surface are straight in the axial direction.

  Also in the large bush 28, the pair of half bodies 40-1 and 40-2 in the outer cylinder 40 are integrally vulcanized and bonded to the rubber elastic body 44, and the pair of half bodies 40- 1, 40-2 are integrated.

In this embodiment, the connecting portion 30 in the torque rod 22 has a pair of metal-made rigid plate-like portions 72 and 72 arranged at intervals as shown in FIG. 4 and a gap between them. It consists of buried rubber 74 filled with S.
Here, the pair of plate-like portions 72 and the embedded rubber 74 are integrally fixed by vulcanization adhesion.

The outer surfaces of the pair of plate-like portions 72 are covered with a thin coating rubber 76. This also applies to the small bush 26 and the large bush 28.
That is, the outer surfaces of the outer cylinder 32 and the flange-shaped portion 38 in the small bush 26 are covered with the covering rubber 76, and the outer surfaces of the outer cylinder 40 and the flange-shaped portion 70 in the large bush 28 are covered with the covering rubber 76.

The connecting portion 30, and hence the plate-like portion 72, is formed with an opening 78 having a long hole shape in the longitudinal direction as shown in FIGS.
The inner surface of the opening 78 of the plate-like portion 72 is also covered with a covering rubber 76.

In the present embodiment, the metal portion (excluding the inner cylinders 34 and 42) in the torque rod 22 is composed of a pair of metal plates (plate bodies) 80-1 and 80-2 shown in FIG.
That is, the outer cylinder 32 and the bowl-shaped part 38 in the small bush 26, the outer cylinder 40 and the bowl-shaped part 70 in the large bush 28, and the pair of plate-like parts 72 in the connecting part 30 are a pair of the metal plates 80-1. 80-2.

Specifically, the half 32-1 in the small bush 26, the half 40-1 in the large bush 28, and one plate-like portion 72 in the connecting portion 30 are integrally configured by the metal plate 80-1 in FIG. Has been.
Further, the other half body 32-2 in the small bush 26, the other half body 40-2 in the large bush 28, and the other plate-like part 72 in the connecting portion 30 are integrally configured by the metal plate 80-2 in FIG. Has been.
Note that the flanges 38 and 70 in the small bush 26 and the large bush 28 are also formed of halves, which are integrally formed with the metal plates 80-1 and 80-2.

Here, the pair of metal plates 80-1 and 80-2 are made of a pressed product, and are symmetrical in the vertical direction (the axial direction of the bush) in FIG.
That is, the metal plates 80-1 and 80-2 are both made of the same member, and are arranged upside down.

In this embodiment, as shown in FIG. 6, each of the metal plates 80-1 and 80-2 is provided with ribs (projections) 82 that protrude from the plate surface by small dimensions, and these ribs 82 are butted against each other. In this state, rubber is integrally vulcanized and bonded to the metal plates 80-1 and 80-2.
The gap S formed between the plate-like portions 72 and 72 in the metal plates 80-1 and 80-2 is filled with rubber, and a buried rubber 74 is formed.

In this embodiment, as clearly shown in FIGS. 2 and 3, a circular hole 84 is partially formed in the covering rubber 76. Furthermore, a crescent-shaped hole 86 is partially formed along the outer periphery.
These holes 84 and 86 are formed by pins provided in the vulcanization mold during rubber vulcanization molding.

That is, in this embodiment, the rubber material is injected and the whole is integrally vulcanized and molded with the pair of metal plates 80-1 and 80-2 set in the vulcanization mold. If the metal plates 80-1 and 80-2 are lifted, the product cannot be vulcanized well.
Therefore, the pair of metal plates 80-1 and 80-2 are pressed against each other by pins provided on the vulcanizing mold, and in this state, a rubber material is injected and vulcanized.

The holes 84 and 86 are formed by pins provided in the vulcanization mold at that time.
That is, by forming such holes 84 and 86, rubber can be vulcanized and molded while the pair of metal plates 80-1 and 80-2 are held in an overlapping state.

In the present embodiment, the torque rod 22 can be manufactured as follows.
That is, as shown in FIG. 6, the metal plate 80-2 is set in the vulcanization mold, and then the inner cylinder 34 in the small bush 26 is set in the vulcanization mold.

At the same time, the intermediate plate 48 and the inner cylinder 42 of the large bush 28 are set in the same vulcanizing mold, and then another metal plate 80-1 is set, and then a rubber material is injected into the vulcanizing mold. Vulcanize and mold.
Here, the metal plates 80-2, 80-1, the inner cylinders 34, 42 and the intermediate plate 48 are integrated via rubber vulcanized.

  That is, the rubber elastic body 36 in the small bush 26, the rubber elastic body 44 in the large bush 28, the buried rubber 74 in the connecting portion 30, and the covering rubber 76 are integrally vulcanized and molded by injecting the rubber material and heating and vulcanizing for a predetermined time. At the same time, the pair of plate-like portions 72 in the connecting portion 30 of the torque rod 22 and the pair of halves 32-1 and 32-2 in the outer tube 32 of the small bush 26 are paired in the outer tube 40 of the large bush 28. The bodies 40-1 and 40-2, the inner cylinder 34 of the small bush 26, the inner cylinder 42 of the large bush 28, and the intermediate plate 48 are connected to the rubber elastic body 36 of the small bush 26 and the rubber elastic body 44 of the large bush 28. The rubber is integrally vulcanized and bonded to the buried rubber 74 and the covering rubber 76 of the portion 30.

As described above, in the present embodiment, the outer cylinder 32 of the small bush 26 is configured by aligning the pair of halves 32-1 and 32-2 that are divided into two in the axial direction. 32 inner circumferential surface shaped like a smaller diameter than the maximum outer diameter D ₂ of the bulge portion 54 of the axial ends of the inner diameter D ₁ is the inner cylinder 34 of a concave shape along the bulge shape of the inner cylinder 34 Can be made.
Thus, by enabling the outer cylinder 32 to have such a concave curved shape, the spring rigidity in the torsional direction and the twisting direction can be sufficiently softened while maintaining the spring rigidity in the direction perpendicular to the axis sufficiently high. Can do.
As a result, idle vibrations and other vibrations can be sufficiently absorbed, and soundproof performance can be improved.

Further, since the thickness T of the rubber elastic body 36 can be equalized along the bulge shape of the inner cylinder 34, even when a load in the direction perpendicular to the axis is repeatedly applied to the rubber elastic body 36, The problem of a large load acting locally can be solved, and the load can be evenly distributed throughout the rubber elastic body 36.
As a result, the durability against the repeated action of the load in the direction perpendicular to the axis can also be enhanced as compared with the prior art.

In this embodiment, after setting one half 32-2 of the outer cylinder 32 in a vulcanization mold of the rubber elastic body 36, an inner cylinder 34 whose outer peripheral surface has a bulge shape is set, and then the outer cylinder By setting the other half 32-1 in 32, the inner cylinder 34 and the outer cylinder 32 can be satisfactorily set in the vulcanization mold, and the inner diameter D of both ends in the axial direction of the outer cylinder 32. in case of no smaller diameter than the maximum outer diameter D ₂ of the bulge portion 54 of the inner cylinder 34 to _1, it becomes possible to inexpensively manufacture the small bush 26 according to facilitate a simple manufacturing process.

  In the present embodiment, since the pair of halves 32-1 and 32-2 constituting the outer cylinder 32 are vulcanized and bonded together with the rubber elastic body 36, the outer cylinder 32 is paired with the pair of halves 32--. Even when the configuration is divided into 1 and 32-2, the rubber elastic body 36 is not required without requiring a special process of joining the half bodies 32-1 and 32-2 to form the outer cylinder 32. Simultaneously with the vulcanization bonding, the pair of halves 32-1 and 32-2 can be integrated through the rubber elastic body 36.

  Moreover, since the torque rod 22 of this embodiment can comprise the outer cylinders 32 and 40 of the connection part 30, the small bush 26, and the large bush 28 simultaneously by overlapping the plate-shaped part 72, each bush 26, The torque rod including 28 can be manufactured at a low cost by a simple process.

  In the present embodiment, since the metal plates 80-1 and 80-2 including the plate-like portion 72 are configured by metal press-worked products, they can be easily connected only by pressing one plate material. The plate-like portion 72 in the portion 30 and the half bodies 32-1, 32-2, 40-1, and 40-2 of the outer cylinders 32 and 40 in the bushes 26 and 28 can be easily formed integrally.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention is not limited to the shape of the bulge portion 54 in the small bush 26 and the shape of the outer cylinder 32 other than the above examples. The above embodiment is an example in which the present invention is applied to a small bush of a torque rod, but the present invention is used for various applications other than a small bush of a torque rod or a torque rod. The present invention can be configured in variously modified forms without departing from the gist of the present invention, such as being applicable to an anti-vibration bush.

It is a figure which shows the torque rod which has the small bush of one Embodiment of this invention with an engine and a suspension member. It is a perspective view of the torque rod. It is a plane sectional view of the torque rod. It is side surface sectional drawing of the torque rod. It is side surface sectional drawing of the small bush of the torque rod. It is a figure which decomposes | disassembles and shows the metal plate which comprises the metal part of the torque rod with an inner cylinder. It is a figure which shows an example of the conventional torque rod. It is a figure which shows the small bush in the conventional torque rod different from FIG.

Explanation of symbols

10 Suspension member (body)
12 Engine 22 Torque rod 26 Small bush 28 Large bush 30 Connecting part 32, 40 Outer cylinder 32-1, 32-2, 40-1, 40-2 Half body 34, 42 Inner cylinder 36, 44 Rubber elastic body 54 Bulge part 80-1, 80-2 Metal plate (plate)
72 Plate-shaped part D Inner diameter at both ends in _one axial direction D ₂ Maximum outer diameter of bulge part

Claims (5)

It has a rigid outer cylinder, an inner cylinder, and an intermediate rubber elastic body connecting them, and the outer cylinder has a radially outer shape whose outer peripheral surface shape increases from both ends in the axial direction toward the center. In the anti-vibration bush that has a bulge shape that bulges outward,
The outer cylinder has an inner peripheral surface shape that decreases along the bulge shape from the central portion in the axial direction to both end portions to reduce the inner diameter, and the inner diameter at both end portions in the axial direction is the central portion of the bulge shape. The outer cylinder is configured by a half body formed by dividing the outer cylinder into two in the axial direction at the central portion in the axial direction. Anti-vibration bush.   2. The vibration isolating bush according to claim 1, wherein a pair of halves constituting the outer cylinder are vulcanized and bonded together with the rubber elastic body.   3. The anti-vibration bush according to claim 1, wherein the anti-vibration bush is connected to a small bush at one end and a large bush at the other end each having a rigid outer cylinder, an inner cylinder, and an intermediate rubber elastic body. An anti-vibration bushing comprising the small bushing of a torque rod having a rigid connecting portion and interposed between an engine side and a body side of a vehicle.   4. The torque rod according to claim 3, wherein the connecting portion includes a pair of rigid plates that are symmetrical with each other, and one half of the outer cylinder of the small bush is provided on one plate. And the other half of the outer cylinder of the small bush and the other half of the outer cylinder of the large bush are integrally formed on the other plate. The vibration-proof bushing is characterized in that the connecting portions of the torque rods and the outer bushes of the small bush and the large bush are configured by overlapping the plates.   5. The vibration isolating bush according to claim 3, wherein the plate body is formed of a metal press-worked product.

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