JP2009097618A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device enhanced in the rigidity of the insertion hole periphery of a bracket by devising a sidewall shape of a swelling part. <P>SOLUTION: A cylindrical member 16 for fitting a vibration control device body 10 inside for absorbing or damping vibration is integrally installed at the swelling side end of the swelling part 21 of the bracket 20. A bending part 24a bent in the swelling direction by press molding, is formed in the vicinity of an insertion hole 23 at the sidewall 24 of the swelling part 21 of the bracket 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration isolator.

  Conventionally, it is interposed between a power plant of an automobile and the vehicle body, supports the load of the power plant, absorbs or attenuates vibration from the power plant, and suppresses vibration transmission to the vehicle body. Devices are known (see, for example, Patent Documents 1 to 5).

For example, in Patent Document 1, a bulging portion is formed by bulging a substantially center position of a single plate material by press molding, and an insertion hole is formed in a flat portion on both sides of the bulging portion of the plate material. A bracket for configuring the device is described. An insulator is attached to the bracket, and the insulator and the engine unit are connected by inserting a fastening bolt into the insertion hole of the bracket and screwing the bracket into the engine unit.
JP-A-10-297292 Japanese Patent No. 3864154 Japanese Patent Laid-Open No. 10-315789 JP 2000-266122 A JP-A-9-96328

  However, in the conventional vibration isolator, when the fastening bolt is inserted into the insertion hole of the bracket and screwed into the engine unit, the necessary rigidity cannot be ensured because stress concentrates around the insertion hole, and durability and vibration resistance There was a risk of performance degradation. Therefore, the present inventor has invented the vibration isolator 5 having the configuration shown in FIGS. 6 and 7 so as to eliminate the lack of rigidity around the insertion hole. Specifically, as shown in FIGS. 6 and 7, the vibration isolator 5 includes a vibration isolator body 10 that absorbs or attenuates vibrations, and a metal cylindrical shape in which the vibration isolator body 10 is fitted. The member 16 and the metal bracket 20 attached to the outer periphery of the cylindrical member 16 are provided. Here, a bulging portion 21 is formed at a substantially central portion in the lateral direction of the bracket 20, and insertion holes 23 are formed in the planar portions 22 on both sides of the bracket 20 with the bulging portion 21 interposed therebetween. And the reinforcement board 35 is welded and attached so that it may straddle the plane part 22 of the both sides of the bracket 20, and the rigidity of the penetration hole 23 periphery is improved.

  However, since the structure of the vibration isolator 5 requires a separate welding process for welding the reinforcing plate 35 and the manufacturing cost increases, the development of a vibration isolator capable of reducing the cost while ensuring the necessary rigidity has been developed. It was desired.

  The present invention has been made in view of such a point, and the object of the present invention is to provide a vibration isolator that improves the rigidity around the insertion hole of the bracket by devising the shape of the side wall of the bulging portion. It is to provide.

  In order to achieve the above-described object, in the present invention, the vicinity of the insertion hole in the side wall of the bulging portion of the bracket is bent along the bulging direction so as to function as a reinforcing rib.

  Specifically, the present invention is interposed between a power plant of an automobile and a vehicle body, supports the load of the power plant, absorbs or attenuates vibration from the power plant, and transmits vibration to the vehicle body. The following solution was taken for the anti-vibration device that suppresses noise.

That is, the invention of claim 1 includes an inner cylinder, an outer cylinder provided around the inner cylinder, and a rubber elastic body provided between the two cylinders and connecting the two cylinders to each other. A vibration isolator main body having,
A cylindrical member in which the vibration isolator main body is inserted;
It has a bulging portion in which a substantially central portion in the lateral direction of one plate material is bulged from one end side to the other end side in the vertical direction by press molding, and the bulging side end portion of the bulging portion is A bracket attached to the outer periphery of the tubular member,
Insertion holes are formed in the planar portions on both outer sides of the bulging portion in the plate material forming the bracket,
In the vicinity of the insertion hole in the side wall of the bulging portion, a bent portion that is bent along the bulging direction by press molding is formed.

  According to the first aspect of the present invention, since the bent portion bent along the bulging direction by press molding is formed in the vicinity of the insertion hole in the side wall of the bulging portion of the bracket, the bent portion functions as a reinforcing rib. In addition, the rigidity around the insertion hole where stress is most likely to be concentrated when the bracket is fastened with fastening bolts can be improved, and the durability and vibration resistance performance of the bracket are improved.

  In addition, the rigidity around the insertion hole of the bracket can be increased by only a very simple manufacturing process in which the side wall in the vicinity of the insertion hole of the bulging portion is bent by press molding. The necessary rigidity can be ensured without welding and attaching the reinforcing plate so as to straddle, which is advantageous in reducing the weight of the product and the manufacturing cost.

The invention of claim 2 is the invention according to claim 1,
The side wall of the bulging portion is formed in a substantially triangular shape that becomes narrower from the base end portion toward the bulging side end portion.

  According to the invention of claim 2, since the side wall of the bulging portion is formed in a substantially triangular shape that becomes narrower from the base end portion toward the bulging side end portion, the stress applied to the periphery of the insertion hole is increased. This is advantageous in reducing the concentration of stress by being dispersed on each side of the side wall.

The invention of claim 3 is the invention according to claim 1 or 2,
The side wall of the bulging portion is curved inwardly of the bulging portion and extends in the bulging direction.

  According to the invention of claim 3, since the side wall of the bulging portion is curved inwardly, the curved portion of the side wall functions as a reinforcing rib, so that the rigidity of the side wall of the bulging portion is increased. This is advantageous.

  As described above, according to the present invention, the bent portion that is bent along the bulging direction by press molding near the insertion hole in the side wall of the bulging portion of the bracket functions as a reinforcing rib. In this case, the rigidity around the insertion hole where stress is most likely to be concentrated can be increased, and the durability and vibration resistance of the bracket are improved. In addition, since it is possible to ensure the required rigidity simply by forming the bent portion, there is no need to perform a separate welding process such as welding and attaching a reinforcing plate across the flat portion of the bracket as in the past. This is advantageous in reducing the manufacturing cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  1 is a perspective view showing a configuration of a vibration isolator according to an embodiment of the present invention, FIG. 2 is a perspective view when the vibration isolator is viewed from another direction, FIG. 3 is a plan view, and FIG. 4 is a front view. FIG. 5 is a view taken in the direction of arrow A in FIG. As shown in FIGS. 1 to 5, the vibration isolator 1 is interposed between a power plant and a vehicle body (not shown) to support the load of the power plant and to vibrate vibration from the power plant. It is for absorbing or attenuating and suppressing vibration transmission to the vehicle body.

  Specifically, the vibration isolator 1 includes a vibration isolator body 10 that absorbs or attenuates vibration, a metallic cylindrical member 16 in which the vibration isolator body 10 is fitted, and an outer periphery of the cylindrical member 16. And two metal brackets 20 and 30 attached to each other. The vibration isolator 1 suspends a transmission-side end portion of a power plant mounted horizontally in an engine room, for example, so that the axis of the inner cylinder 11 is generally directed in the front-rear direction of the vehicle body. Has been placed.

  The cylindrical member 16 into which the vibration isolator main body 10 is press-fitted and fixed is attached to the outer periphery of the cylindrical member 16 by two metal brackets 20 and 30 integrally attached so as to extend outward in the cylindrical radial direction. On the other hand, the inner cylinder 11 is connected to a body frame (not shown) of the vehicle body, and the power plant on the vibration source side is attached to the inner cylinder 11 by mounting brackets (not shown) whose both ends in the cylinder axis direction are coupled by fastening bolts or the like. To be connected to. Specifically, the planar portion 22 of the bracket 20 and the vehicle body mounting surface 31 of the bracket 30 are substantially perpendicular to each other, and insertion holes 23 and 32 are provided in the planar portion 22 of the bracket 20 and the vehicle body mounting surface 31 of the bracket 30, respectively. The brackets 20 and 30 are connected to the vehicle body frame by inserting fastening bolts through the insertion holes 23 and 32 and screwing them into the vehicle body frame.

  The vibration isolator body 10 includes a hollow cylindrical metal inner cylinder 11 and a hollow cylindrical metal outer cylinder provided coaxially with the inner cylinder 11 on the outer periphery of the inner cylinder 11. 12 and a rubber elastic body 13 provided between the cylinders 11 and 12 and connecting the cylinders 11 and 12 to each other.

  The inner cylindrical body 11 is longer in the cylinder axial direction than the outer cylindrical body 12, and both ends in the cylindrical axial direction protrude from the outer cylindrical body 12. Rubber stoppers 14 are fitted on both ends of the inner cylinder 11 in the cylinder axis direction via rubber elastic bodies 13 on the outer periphery thereof.

  The stopper 14 has a substantially fan-shaped plate shape, and an inner cylinder insertion hole 14a through which the inner cylinder 11 is inserted is formed at the center in the cylinder radial direction. Each extends. The end portion on the arc side of the stopper 14 is thicker than the other portions, and the thick portion 14b is disposed so as to contact the mounting portion on the power plant side. Are formed respectively. Thereby, the relative movement of the cylinders 11 and 12 in the cylinder axis direction is restricted.

  The bracket 20 has a bulging portion 21 in which a substantially central portion in the horizontal direction of one plate material is bulged from one end side to the other end side in the vertical direction of the plate material by press molding. The exit end is integrally attached to the outer periphery of the tubular member 16. And the penetration hole 23 is formed in the plane part 22 of the both outer sides of the bulging part 21 in a board | plate material.

  A bent portion 24a is formed in the vicinity of the insertion hole 23 in the side wall 24 of the bulging portion 21 of the bracket 20 by bending along the bulging direction by press molding. If such a bent portion 24a is formed in the vicinity of the insertion hole 23, the bent portion 24a functions as a reinforcing rib. Therefore, when the bracket 20 is fastened with a fastening bolt, the rigidity around the insertion hole 23 where stress is most likely to concentrate. And the durability and vibration resistance performance of the bracket 20 are improved. Further, since the rigidity around the insertion hole 23 of the bracket 20 can be easily increased simply by bending the side wall 24 in the vicinity of the insertion hole 23 of the bulging portion 21 by press molding, The necessary rigidity can be ensured without welding and attaching the reinforcing plate so as to straddle, which is advantageous in reducing the weight of the product and the manufacturing cost.

  Further, the side wall 24 of the bulging portion 21 is formed in a substantially triangular shape that becomes narrower from the base end portion toward the bulging side end portion. If the side wall 24 has such a shape, the stress applied to the periphery of the insertion hole 23 is distributed to each side of the side wall 24 of the bulging portion 21, which is advantageous in reducing the concentration of stress. The shape of the side wall 24 is not limited to a triangular shape, and may be any shape as long as necessary rigidity can be ensured.

  Further, the base end side edge portion of the side wall 24 of the bulging portion 21 corresponds to the shape of the bolt head so as not to interfere with the bolt head when a fastening bolt is inserted into the insertion hole 23. 21 is curved inward. In this way, by curving the base end side edge portion of the side wall 24 of the bulging portion 21, the entire side wall 24 is curved inwardly into the bulging portion 21 so as to extend in the bulging direction. By making the side wall 24 into such a shape, the curved portion of the side wall 24 functions as a reinforcing rib, which is advantageous in increasing the rigidity of the side wall 24 of the bulging portion 21.

  As described above, according to the vibration isolator 1 according to the present embodiment, since the bent portion 24a is formed in the vicinity of the insertion hole 23 of the side wall 24 of the bulged portion 21, the bent portion 24a functions as a reinforcing rib. When the bracket 20 is fastened with a fastening bolt, the rigidity around the insertion hole 23 where stress is most likely to concentrate can be increased, and the durability and vibration resistance performance of the bracket 20 are improved. Further, since the rigidity around the insertion hole 23 of the bracket 20 can be increased only by a very simple manufacturing process of bending the side wall 24 in the vicinity of the insertion hole 23 of the bulging portion 21 by press molding, The required rigidity can be ensured without welding and attaching the reinforcing plate so as to straddle the flat portion of the bracket 20, which is advantageous in reducing the weight of the product and the manufacturing cost.

  As described above, the present invention has a highly practical effect that it is possible to provide a vibration isolator that improves the rigidity around the insertion hole of the bracket by devising the shape of the side wall of the bulging portion. Since it is obtained, it is extremely useful and has high industrial applicability.

It is a perspective view which shows the structure of the vibration isolator which concerns on embodiment of this invention. It is a perspective view when the vibration isolator which concerns on this embodiment is seen from another direction. It is a top view which shows the structure of the vibration isolator which concerns on this embodiment. It is a front view which shows the structure of the vibration isolator which concerns on this embodiment. It is A arrow directional view in FIG. It is a perspective view which shows the structure of the conventional vibration isolator. It is a perspective view when the conventional vibration isolator is seen from another direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-vibration apparatus 10 Anti-vibration apparatus main body 11 Inner cylinder 12 Outer cylinder 13 Rubber elastic body 16 Cylindrical member 20 Bracket 21 Bulging part 22 Plane part 23 Insertion hole 24 Side wall 24a Bending part

Claims (3)

A vibration isolator main body having an inner cylinder, an outer cylinder provided around the inner cylinder, and a rubber elastic body provided between the two cylinders and connecting the two cylinders to each other;
A cylindrical member in which the vibration isolator main body is inserted;
It has a bulging portion in which a substantially central portion in the lateral direction of one plate material is bulged from one end side to the other end side in the vertical direction by press molding, and the bulging side end portion of the bulging portion is A bracket attached to the outer periphery of the tubular member,
Insertion holes are formed in the planar portions on both outer sides of the bulging portion in the plate material forming the bracket,
A vibration isolator, wherein a bent portion is formed in the vicinity of the insertion hole in the side wall of the bulging portion, along the bulging direction by press molding. In claim 1,
The side wall of the said bulging part is formed in the substantially triangular shape which becomes narrow as it goes to a bulging side edge part from a base end part, The vibration isolator characterized by the above-mentioned. In claim 1 or 2,
The anti-vibration device according to claim 1, wherein a side wall of the bulging portion is curved inwardly of the bulging portion and extends in the bulging direction.

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