JP2008175359A - Vibration isolating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration isolating system which prevents paint accumulation in a hollow part of an arm. <P>SOLUTION: The arm 2 is composed of a first plate part 21, a second plate part 22, a third plate part 23, and a fourth plate part 24. The first plate part 21 and the second plate part 22 are arranged separated in an axial direction AD1 of a first cylindrical body 5, and their opposing faces 21c, 22c are joined to side parts 23d, 24d of the third plate part 23 and the fourth plate part 24. The third plate part 23 and the fourth plate part 24 are arranged separated in an axial direction AD2 of a second cylindrical body 6 in a first cylindrical body 5 side, they approach each other as they approach the second cylindrical body 6, and they reach the second cylindrical body 6 in the state wherein their opposing faces 23c, 24c abut on each other. A hollow part 20 has a top part 20a tapered off toward the second cylindrical body 6, and the top part 20a is communicated with the exterior via a communication hole 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes an arm, a first tubular body provided at one end of the arm and having a first vibration isolation bush mounted therein, and a second vibration isolation bush provided at the other end of the arm and mounted therein. It is related with a vibration isolator provided with the 2nd cylindrical body.

  Patent Document 1 listed below discloses a torque rod that is interposed between a vehicle body of an automobile and an engine that is a vibration generation source and suppresses vibration transmission to the vehicle body as such a vibration isolator. The torque rod has a first vibration isolation bush connected to one of the vehicle body side and the engine side, and a second vibration isolation bush connected to the other of the vehicle body side and the engine side. The anti-vibration bush is provided so that planes perpendicular to the respective axial directions are orthogonal to each other so that vibration in the roll direction of the engine can be suppressed.

  Conventionally, in order to reduce the weight of the apparatus, improvements have been made such as adopting an aluminum alloy as the material of the arm or reducing the thickness of the arm to such an extent that the strength is not impaired. However, in an arm constituted by a columnar member or a rod-shaped member as disclosed in the following Patent Documents 1 to 3, it is difficult to significantly reduce the wall thickness and volume. It is preferable that the arm is configured by combining a plurality of plate members as disclosed in FIG.

  By the way, as a coating treatment applied for the purpose of rust prevention, in recent years, cationic electrodeposition coating has attracted attention from the viewpoint of corrosion resistance and low cost. In this cationic electrodeposition coating, the object to be coated (the vibration isolator before mounting the vibration isolating bushing) is immersed in a coating solution, and a DC current is passed between the object to be coated as a cathode and the counter electrode. A coating is deposited on the surface of the object. After the coating film is formed, the object to be coated is pulled up from the coating solution and dried.

  However, when the arm is composed of a plurality of plate members and a hollow portion is formed in the interior thereof, the coating solution enters the hollow portion from the minute gaps between the plate members in the above-described dipping step. Sometimes. Since the coating solution that has entered the hollow portion is not easily discharged to the outside, it hardens and becomes a coating pool, resulting in problems such as a deterioration in coating yield and an increase in weight. On the other hand, although it can be considered that the hollow portion is formed as a sealed space having no minute gap, there is a problem in that the productivity is greatly deteriorated and the weight is increased due to an increase in weld overlay.

In addition, the vibration isolator described in the following Patent Document 4 arranges a plurality of plate materials obtained by cutting out extruded products at intervals in the thickness direction, and inserts vibration isolation bushes into the holes of each plate material. The hollow portion as described above is not formed. Moreover, the first anti-vibration bush and the second anti-vibration bush are not provided such that the planes perpendicular to the respective axial directions are orthogonal to each other.
JP 2005-315315 A JP 2005-188575 A JP 2005-75223 A JP 2006-220172 A

  This invention is made | formed in view of the said situation, The objective is to provide the vibration isolator which can prevent the coating pool in the hollow part of the arm comprised with the board | plate material.

  The above object can be achieved by the present invention as described below. That is, the vibration isolator according to the present invention is provided with an arm, a first cylindrical body provided at one end of the arm, a first vibration isolating bush mounted therein, and the other end of the arm. 2 In the vibration isolator including the second cylindrical body in which the vibration isolating bush is mounted, the first cylindrical body and the second cylindrical body are in a positional relationship in which planes perpendicular to the axial direction are orthogonal to each other. And one end of the arm extending along the circumferential direction of the first cylindrical body is joined to the outer peripheral surface of the first cylindrical body, and the other end is an outer peripheral surface of the second cylindrical body. The first plate portion and the second plate portion to be joined to each other, and one end extending along the axial direction of the first tubular body are joined to the outer peripheral surface of the first tubular body, and the other end is A third plate portion and a fourth plate portion joined to the outer peripheral surface of the second cylindrical body, wherein the first plate portion and the second plate portion are paired with each other; However, while being spaced apart in the axial direction of the first cylindrical body, the opposed surface of the first plate portion and the opposed surface of the second plate portion are formed on the third plate portion and the fourth plate portion. The third plate portion and the fourth plate portion are joined to the side portion, and are arranged apart from each other in the axial direction of the second cylindrical body on the first cylindrical body side while facing each other. 2 approaching the cylindrical body, reaching the second cylindrical body in a state where the opposing surface of the third plate portion and the opposing surface of the fourth plate portion are in contact with each other, A hollow portion surrounded by an outer peripheral surface, an opposing surface of the first plate portion, an opposing surface of the second plate portion, an opposing surface of the third plate portion, and an opposing surface of the fourth plate portion. And having a top portion that tapers toward the second cylindrical body as viewed from the axial direction of the first cylindrical body, and includes the first plate portion, the second plate portion, the third plate portion, and the first plate portion. At least one of the four plate parts , In which communication holes communicating the top portion of the hollow portion to the outside is provided.

  The arm provided in the vibration isolator of the present invention is composed of a plurality of plate members including the first to fourth plate portions, one end thereof being the outer peripheral surface of the first cylindrical body, and the other end being the second cylindrical shape. It is joined to the outer peripheral surface of the body. The first plate portion and the second plate portion are arranged apart from each other in the axial direction of the first cylindrical body while facing each other, and the side portions of the third plate portion and the fourth plate portion are joined to their facing surfaces. Yes. That is, the first plate portion and the second plate portion are arranged at positions sandwiching the third plate portion and the fourth plate portion while making the thickness direction substantially orthogonal to the third plate portion and the fourth plate portion. . The third plate portion and the fourth plate portion are arranged away from each other in the axial direction of the second cylindrical body on the first cylindrical body side while facing each other, close to the second cylindrical body, and their facing surfaces The second cylindrical body is reached in a state where the abutting is made. With this configuration, a hollow portion having a top portion that tapers toward the second cylindrical body is formed.

  The hollow portion is surrounded by the outer peripheral surface of the first cylindrical body and the opposing surfaces of the first to fourth plate portions, and the paint that has entered from the minute gaps in the immersion process during coating is outward. Although it is difficult to be discharged, in the present invention, since at least one of the first to fourth plate portions is provided with a communication hole that communicates the hollow portion outward, the paint is smoothly discharged through the communication hole. can do. Moreover, since the communication hole communicates outwardly with the top portion that tapers toward the second cylindrical body, the paint in the hollow portion can be suspended by hanging the first cylindrical body upward. It is possible to efficiently collect and discharge the ink and to reduce the remaining paint as much as possible to effectively prevent the accumulation of paint.

  In the above, the through-hole which penetrates the said 3rd board part and the said 4th board part is provided in the location where the opposing surface of the said 3rd board part and the opposing surface of the said 4th board part contact | abut. Is preferred. According to such a configuration, it is possible to simplify the relative alignment between the third plate portion and the fourth plate portion by using the through holes when the plate portions are joined, and it is possible to contribute to weight reduction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an example of a vibration isolator according to the present invention. FIG. 2 is a front view of the vibration isolator. The vibration isolator 1 is interposed between a vehicle body and an engine that is a vibration generation source, and is used as a torque rod that suppresses vibration transmission to the vehicle body side.

  The vibration isolator 1 is provided on the arm 2 and one end 2a of the arm 2, the first cylindrical body 5 in which the first vibration isolating bush 3 is mounted, and the other end 2b of the arm 2, 2 is provided with a second cylindrical body 6 on which an anti-vibration bush 4 is mounted. In a state where the vibration isolator 1 is assembled to the vehicle, the arm 2 extends in the front-rear direction of the vehicle, the first vibration isolating bush 3 is connected to the vehicle body side, and the second vibration isolating bush 4 is connected to the engine side.

  The arm 2, the first cylindrical body 5, and the second cylindrical body 6 can be formed of a metal material such as a steel material. One end 2 a of the arm 2 is fixed to the outer peripheral surface of the first cylindrical body 5, and the other end 2 b is fixed to the outer peripheral surface of the second cylindrical body 6 by welding. The detailed structure of the arm 2 will be described later. The first cylindrical body 5 and the second cylindrical body 6 may be constituted by a drawing pipe or the like, but in this embodiment, in order to reduce the manufacturing cost, a plate material bent into a cylindrical shape is used. It is formed by welding the butt ends.

  The first anti-vibration bush 3 includes an inner cylinder 31, an outer cylinder 32 that surrounds the inner cylinder 31 in an axially parallel manner, and a rubber-like elasticity that is interposed between the inner cylinder 31 and the outer cylinder 32 to elastically connect them. A body 33 and a pair of cavities 34 positioned along the longitudinal direction of the arm 2 with the inner cylinder 31 interposed therebetween are provided. The outer cylinder 32 is press-fitted into the first cylindrical body 5 while being reduced in diameter by drawing. The first anti-vibration bush 3 has a cylindrical shape larger in diameter than the second anti-vibration bush 4 and is assembled with its axial direction as the vehicle vertical direction.

  The second anti-vibration bush 4 includes an inner cylinder 41, an outer cylinder 42 that surrounds the inner cylinder 41 in an axially parallel manner, and a rubber-like elasticity that is interposed between the inner cylinder 41 and the outer cylinder 42 and elastically connects them. And a body 43. The outer cylinder 42 is press-fitted into the second cylindrical body 6 while being reduced in diameter by drawing. The second anti-vibration bush 4 is assembled with its axial direction as the vehicle width direction. That is, the first anti-vibration bush 3 and the second anti-vibration bush 4 have a positional relationship in which planes perpendicular to the respective axial directions are orthogonal to each other, and are configured to effectively suppress vibrations in the roll direction of the engine. ing.

  The damper 7 is configured by elastically supporting the mass member 71 on the base plate 72 via a rubber-like elastic body 73, and is connected and fixed to the mounting plate 10 that projects from the arm 2. The mounting plate 10 is provided integrally with the second plate portion 22 constituting the arm 2, and the base plate 72 is fixed by fastening the nut 12 to the weld bolt 11. The damper 7 has a function of suppressing vibration generated in the arm 2 due to the resonance action of the mass member 71.

  The anti-vibration device 1 shown in FIG. 1 joins and unifies the arm 2, the first cylindrical body 5, and the second cylindrical body 6, and then applies a coating treatment to dry the first anti-vibration bush 3. And the second vibration-proof bushing 4 and the damper 7 are attached. FIG. 3 is a plan view showing the vibration isolator 1 before the first vibration isolating bush 3 and the second vibration isolating bush 4 are mounted. FIG. 4 is a front view of the vibration isolator, and FIG. 5 is a bottom view of the vibration isolator.

  As shown in detail in FIGS. 3 to 5, the arm 2 is constituted by four plate members of a first plate portion 21, a second plate portion 22, a third plate portion 23, and a fourth plate portion 24. The first plate portion 21 and the second plate portion 22 have one ends 21 a and 22 a that are curved and extend along the circumferential direction of the first tubular body 5, and are joined to the outer peripheral surface of the first tubular body 5 by welding. The other ends 21b and 22b extend in the axial direction AD2 of the second cylindrical body 6 and are joined to the outer peripheral surface of the second cylindrical body 6 by welding.

  One ends 21 a and 22 a of the first plate portion 21 and the second plate portion 22 extend with a circumferential length of 1/3 or more with respect to the outer peripheral surface of the first tubular body 5, and the second plate portion 22. The mounting plate 10 is formed in substantially the same shape except that the mounting plate 10 is formed to protrude. Moreover, the vicinity of the other end 21b, 22b of the 1st board part 21 and the 2nd board part 22 is curving along the circumferential direction of the 2nd cylindrical body 6, as shown in FIG. The length is relatively longer in the vicinity of the other end 22 b of the second plate portion 22 below the second cylindrical body 6.

  On the other hand, each of the third plate portion 23 and the fourth plate portion 24 has one ends 23a and 24a extending in the axial direction AD1 of the first tubular body 5 and joined to the outer peripheral surface of the first tubular body 5 by welding. At the same time, the other ends 23b, 24b are curved and extend along the circumferential direction of the second cylindrical body 6, and are joined to the outer peripheral surface of the second cylindrical body 6 by welding.

  As shown in FIG. 4, the first plate portion 21 and the second plate portion 22 are arranged away from each other in the axial direction AD <b> 1 of the first tubular body 5 while facing each other. Further, the third plate portion 23 and the fourth plate portion 24 are arranged between them, and the opposing surface 21c of the first plate portion 21 and the opposing surface 22c of the second plate portion 22 are the third plate portion 23. And it is joined to the side parts 23d and 24d of the 4th board part 24 by welding. Accordingly, the first plate portion 21 and the second plate portion 22 have the thickness direction substantially orthogonal to the third plate portion 23 and the fourth plate portion 24, and sandwich the third plate portion 23 and the fourth plate portion 24 therebetween. Arranged in position.

  As shown in FIGS. 3 and 5, the third plate portion 23 and the fourth plate portion 24 are arranged away from each other in the axial direction AD <b> 2 of the second tubular body 6 on the first tubular body 5 side while facing each other. In addition, the second cylinder is brought into contact with the opposing surface 23c of the third plate portion 23 and the opposing surface 24c of the fourth plate portion 24 in contact with each other while gradually decreasing the distance toward the second cylindrical body 6. The state body 6 has been reached. The 3rd board part 23 and the 4th board part 24 are formed in the substantially same shape, The width direction and the circumferential direction length of the other ends 23b and 24b are the space | intervals of the opposing surface 21c and the opposing surface 22c. It corresponds.

  The portions near the one ends 23 a and 24 a of the third plate portion 23 and the fourth plate portion 24 are curved along the circumferential direction of the first tubular body 5. Between the opposing surface 23c of the 3rd board part 23 and the opposing surface 24c of the 4th board part 24, the circumferential direction length of the outer peripheral surface part of the 1st cylindrical body 5 which is not contacting them is the 1st board. It is shorter than the circumferential direction length of one end 21a of the part 21 and the 2nd board part 22, and 22a. Further, the third plate portion 23 and the fourth plate portion 24 are in contact with each other at substantially the center in the longitudinal direction thereof, and the width direction of the first plate portion 21 and the second plate portion 22 (the vertical direction in FIG. 3). ).

  The hollow portion 20 includes an outer peripheral surface of the first cylindrical body 5, an opposing surface 21c of the first plate portion 21, an opposing surface 22c of the second plate portion 22, an opposing surface 23c of the third plate portion 23, The periphery is surrounded by the opposing surface 24 c of the four plate portions 24. However, in places where welding is difficult, such as the ends in the width direction (vertical direction in FIG. 4) of the ends 23a and 24a of the third plate portion 23 and the fourth plate portion 24, a minute amount is obtained according to the dimensional accuracy of each plate portion. A gap is formed. As shown in FIGS. 3 and 5, the hollow portion 20 is formed in a deformed triangular shape having a top portion 20 a that tapers toward the second tubular body 6 when viewed from the axial direction AD <b> 1 of the first tubular body 5. Yes.

  In the case of applying cationic electrodeposition coating with the vibration isolator shown in FIGS. 3 to 5 as an object to be coated, the vibration isolator is immersed in a coating solution in a liquid tank, and the vibration isolator is used as a cathode between the counter electrode. A direct current is applied to deposit a coating film on the surface of the arm 2 or the like. At this time, the coating solution may enter the hollow portion 20 from the minute gap. After the coating film is formed, the vibration isolator is pulled up from the coating solution and dried.

  In this embodiment, the 1st board part 21, the 2nd board part 22, the 3rd board part 23, and the 4th board part 24 are provided with the communicating hole 8 which connects the top part 20a of the hollow part 20 to the outward. . As a result, the paint solution can be smoothly discharged through the communication hole 8, and coating accumulation in the hollow portion 20 can be prevented. In addition, since the communication hole 8 communicates the top portion 20a outward, the coating solution in the hollow portion 20 is suspended by suspending the first cylindrical body 5 upward as shown in FIG. It is possible to efficiently collect and drain and to reduce the remaining coating solution as much as possible and to effectively prevent the accumulation of coating.

  In the present invention, it is sufficient that the communication hole 8 is provided in at least one of the first plate portion 21, the second plate portion 22, the third plate portion 23, and the fourth plate portion 24. From the viewpoint of improving the quality, it is preferable that the communication holes 8 are provided in all of the first plate portion 21, the second plate portion 22, the third plate portion 23, and the fourth plate portion 24 as in the present embodiment.

  In the present embodiment, a through hole 91 that penetrates the third plate portion 23 and the fourth plate portion 24 is formed at a location where the facing surface 23c of the third plate portion 23 and the facing surface 24c of the fourth plate portion 24 abut. Is provided. The through hole 91 is drilled in advance before the third plate portion 23 and the fourth plate portion 24 are combined, and at the time of joining, the third plate portion 23 and the fourth plate portion are based on the position of the through hole 91. In addition to being able to easily perform relative positioning with respect to 24, it can also contribute to weight reduction. Further, the first plate portion 21 and the second plate portion 22 are each provided with a hole 92 for reducing the weight in the same position as the through hole 91 in the longitudinal direction.

  The present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention. For example, the spring characteristics of the vibration-proof bushing can be used depending on the application and conditions to be used. It can be changed accordingly.

The top view which shows an example of the vibration isolator which concerns on this invention Front view of the vibration isolator shown in FIG. The top view which shows the vibration isolator before mounting | wearing with the 1st vibration proof bush and the 2nd vibration proof bush Front view of the vibration isolator shown in FIG. Bottom view of the vibration isolator shown in FIG. The perspective view when the vibration isolator shown in FIG. 3 is suspended

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-vibration device 2 Arm 2a One end 2b of arm The other end 3 of arm 3 1st anti-vibration bush 4 2nd anti-vibration bush 5 1st cylindrical body 6 2nd cylindrical body 8 Communication hole 20 Hollow part 20a Top part 21 1st Plate portion 21a One end 21b of the first plate portion The other end 21c of the first plate portion The opposing surface 22 of the first plate portion Second plate portion 22a One end 22b of the second plate portion The other end 22c of the second plate portion The second plate portion The opposite surface 23 of the third plate portion 23a One end 23b of the third plate portion 23c The other end 23c of the third plate portion The opposite surface 23d of the third plate portion The side portion 24 of the third plate portion The fourth plate portion 24a of the fourth plate portion One end 24b The other end 24c of the fourth plate part 24d The opposing surface 24d of the fourth plate part The side part 91 of the fourth plate part Through-hole AD1 Axial direction AD1 of the first cylindrical body AD2 Axial direction of the second cylindrical body

Claims (2)

An arm, a first tubular body provided at one end of the arm and having a first anti-vibration bush mounted therein, and a first tubular body provided at the other end of the arm and having a second anti-vibration bush mounted therein; In a vibration isolator comprising two cylindrical bodies,
The first cylindrical body and the second cylindrical body are in a positional relationship in which planes perpendicular to the axial direction are orthogonal to each other;
One end of the arm extending along the circumferential direction of the first cylindrical body is joined to the outer peripheral surface of the first cylindrical body, and the other end is joined to the outer peripheral surface of the second cylindrical body. The first plate portion and the second plate portion, and one end extending along the axial direction of the first cylindrical body are joined to the outer peripheral surface of the first cylindrical body, and the other end is the second cylinder. A third plate part and a fourth plate part joined to the outer peripheral surface of the body,
The first plate portion and the second plate portion are arranged apart from each other in the axial direction of the first tubular body while facing each other, and the opposing surface of the first plate portion and the second plate portion The opposing surface is joined to the side portions of the third plate portion and the fourth plate portion,
The third plate portion and the fourth plate portion are arranged apart from each other in the axial direction of the second cylindrical body on the first cylindrical body side while facing each other and toward the second cylindrical body. In the state where the opposing surface of the third plate part and the opposing surface of the fourth plate part are in contact with each other,
An outer peripheral surface of the first cylindrical body, an opposing surface of the first plate portion, an opposing surface of the second plate portion, an opposing surface of the third plate portion, and an opposing surface of the fourth plate portion A hollow portion surrounded by a top portion that tapers toward the second cylindrical body when viewed from the axial direction of the first cylindrical body, the first plate portion, the second plate portion, At least one of the third plate portion and the fourth plate portion is provided with a communication hole that communicates the top portion of the hollow portion outward.   The through-hole which penetrates the said 3rd board part and the said 4th board part is provided in the location where the opposing surface of the said 3rd board part and the opposing surface of the said 4th board part contact | abut. Anti-vibration device.

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