JP2004084708A - Vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration isolator (e.g., a member mount provided between a suspension member and a body frame or a suspension bush provided on a suspension mechanism) capable of reducing the weight or manufacturing cost without causing a trouble such as reduction in comfortableness in the vertical direction of a vehicle. <P>SOLUTION: This vibration isolator has an inner cylinder 1 and outer cylinder mutually connected through a rubber-like elastic body 3 interposed between them, and a pair of intermediate plates 4 and 5 buried in the elastic body 3 to be located across the inner cylinder 1. The intermediate plates 4 and 5 are formed in a corrugated shape in an axial view of the inner and outer cylinders 1 and 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, there is provided an anti-vibration device in which an inner cylinder and an outer cylinder are connected by a rubber-like elastic body interposed therebetween, and a pair of intermediate plates located on both sides of the inner cylinder are embedded in the rubber-like elastic body. Equipment related.
[0002]
[Prior art]
Examples of this type of vibration isolator include a member mount provided between a suspension member of an automobile and a vehicle body frame, and a suspension bush provided at a pivot portion of a suspension mechanism. By embedding the intermediate plate, the spring constant in the direction in which the two intermediate plates are arranged is increased.
[0003]
Then, the vibration isolator is mounted on the body frame or the like so that the direction in which the two intermediate plates are aligned is the width direction of the vehicle, thereby increasing the spring constant of the vibration isolator in the longitudinal direction of the vehicle and increasing the spring constant in the width direction of the vehicle. The aim is to improve the riding comfort and driving stability of automobiles.
[0004]
By the way, if the intermediate plate is formed of one thin metal plate in the above-described vibration isolator, the spring constant in the width direction of the vehicle cannot be increased to a desired height, and conversely, one thick metal plate can be used. When a metal plate is used, the spring constant can be increased, but the weight is increased, and the spring constant in the front-rear direction of the vehicle is easily increased. Further, in the structure in which the one thick metal plate is reduced so that the weight can be reduced, the range in which the spring constant can be increased is reduced, and the riding comfort and steering stability of the automobile are sufficiently improved. Can not.
[0005]
Conventionally, as shown in FIGS. 9 to 13, the intermediate plates 4 and 5 are formed by connecting a large first intermediate metal plate portion 20 having a circular arc shape and a pair of small circular arc-shaped first intermediate metal portions 20 sandwiching the central portion thereof. And two intermediate metal plates 21 and 22. 1 is an inner cylinder, 2 is an outer cylinder, 3 is a rubber-like elastic body, and 23 is a through hole formed in the first intermediate metal plate portion 20.
[0006]
[Problems to be solved by the invention]
According to the above-described conventional configuration, there is a problem in that the welding of the first intermediate metal plate portion 20 and the second intermediate metal plate portions 21 and 22 is expensive and the production cost is high.
[0007]
As a technique for solving this problem, there is a technique in which a central portion of an intermediate plate made of one metal plate is recessed in the radial direction of the inner and outer cylinders to form a recess [see Japanese Utility Model Laid-Open No. 6-76730]. According to this technique, since the rubber-like elastic body portion in the concave portion is restricted from the inner surface of the concave portion and cannot function as an elastic body, the spring constant can be increased, and the weight and weight can be reduced. The production cost can be reduced.
[0008]
However, in the above technique, the rubber-like elastic body portion in the concave portion is also restricted by the pair of upper and lower inner surfaces of the concave portion, and cannot function as an elastic body in the vertical direction, and has a spring constant in the vertical direction. And the ride quality is reduced. Therefore, a new measure for lowering the spring constant in the vertical direction is required.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent weight and manufacturing costs from being reduced without causing problems such as a decrease in ride comfort in the vertical direction of a vehicle. The point is to provide a vibration device.
[0010]
[Means for Solving the Problems]
In the structure of the invention according to claim 1, the inner cylinder and the outer cylinder are connected by a rubber-like elastic body interposed therebetween, and a pair of intermediate plates positioned so as to sandwich the inner cylinder are embedded in the rubber-like elastic body. In the vibration isolator described above, the pair of intermediate plates are formed in a wave shape when viewed from the axial direction of the inner and outer cylinders.
[0011]
According to a second aspect of the present invention, in the first aspect of the present invention, the intermediate plate is formed in a curved shape along the peripheral surface of the inner and outer cylinders, and the intermediate plate in a direction corresponding to a circumferential direction of the inner and outer cylinders. Are formed in a non-corrugated flat shape so as to extend to one end and the other end in the axial direction of the inner and outer cylinders from the corrugated portion.
[0012]
The structure of the invention according to claim 3 is that, in the structure of the invention according to claim 1 or 2, a member mount is provided between the suspension member and the vehicle body frame.
[0013]
The structure of the invention according to claim 4 is that, in the structure of the invention according to claim 1 or 2, the suspension bush provided in the suspension mechanism is configured.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
[First Embodiment]
FIGS. 1 to 3 show an automobile member mount (for a vibration damping device) that is mounted on a vehicle body frame and a suspension member below the vehicle body frame to reduce displacement input to the vehicle body and suppress vibration. (Equivalent).
[0016]
In this member mount, an inner cylinder 1 through which a bolt for attachment to a vehicle body frame (hereinafter, referred to as an “attachment bolt”) is inserted, and an outer cylinder 2 that is thinner and shorter than the inner cylinder 1 are interposed therebetween. A pair of intermediate plates 4 connected by an interposed rubber-like elastic body 3 (which is a vibration-proof base) and located at the center of the rubber-like elastic body 3 in the radial direction of the inner and outer cylinders 1 and 2 with the inner cylinder 1 interposed therebetween. , 5 are buried. As will be described later, the intermediate plates 4 and 5 are members for lowering the spring constant of the rubber-like elastic body 3 in the front-rear direction of the automobile and increasing the spring constant in the width direction (left-right direction on the paper).
[0017]
The structure of each part will be described. The outer cylinder 2 is divided into two parts in the radial direction to form a divided structure composed of a pair of divided outer cylinders 7 and 8, and the lower end of the outer cylinder flange 9 abuts against the lower surface of the suspension member. Is bent, and the outer cylindrical flange 9 supports a rubber-like elastic projection 12 connected to the rubber-like elastic body 3. At the upper end of the inner cylinder 1, an inner cylinder flange 6 that abuts against the mounting surface of the vehicle body frame is formed so as to protrude. Although not shown, a stopper fitting is attached to the lower end of the inner cylinder 1 and a rubber-like elastic projection 12 supported by the outer cylinder flange 9 is pressed against the stopper fitting.
[0018]
The two intermediate plates 4 and 5 are made of metal, and one of the intermediate plates 4 is arranged on one of the divided outer cylinders 7 side, and the other intermediate plate 5 is arranged on the other divided outer cylinder 8 side. As shown in FIGS. 4 and 5, each of the intermediate plates 4 and 5 is formed in a curved shape along the peripheral surface of the inner and outer cylinders 1 and 2 so that both end portions 10 of the inner and outer cylinders 1 and 2 in the axial direction are viewed. (The end portions 10 of the intermediate plates 4 and 5 in the directions corresponding to the circumferential directions of the inner and outer cylinders 1 and 2) are formed in a non-corrugated flat shape, and the top and bottom portions are formed in an arcuate wave shape between them. It is. The two end portions 10 of the intermediate plates 4 and 5 extend to one end and the other end in the axial direction of the inner and outer cylinders 1 and 2 than the corrugated portion 11 therebetween.
[0019]
As shown in FIG. 2, the member mount having the above structure has a vertical posture with the inner cylinder flange 6 side up and a lower posture with the outer cylinder flange 9 side, and a pair of intermediate plates 4 and 5 arranged in the width direction of the automobile. The outer cylinder 2 is press-fitted into the vertical collar of the suspension member from the upper end side of the outer cylinder 2, and is fixed to the vehicle body frame with the mounting bolt inserted through the inner cylinder 3.
[0020]
That is, in the above-described member mount, the spring constant in the direction in which the two intermediate plates 4 and 5 are arranged is increased by embedding the pair of intermediate plates 4 and 5 in the rubber-like elastic body 3, thereby increasing the spring force in the longitudinal direction of the automobile. By lowering the constant and increasing the spring constant in the width direction of the vehicle, the ride comfort and steering stability of the vehicle are improved. Further, the following effects can be obtained by configuring the intermediate plates 4 and 5 as described above.
[0021]
[A] Since the intermediate plates 4 and 5 are formed in a waveform in the axial direction of the inner and outer cylinders 1 and 2, a rubber-like elastic body portion in each concave portion corresponding to each wave of the intermediate plate 4 is formed. Can be restrained, for example, more strongly than a structure in which the rubber-like elastic body portion is restrained by one non-waveform recess having the same size as the waveform portion (that is, one recess having the total size of each wave). The rubber-like elastic body portion can be restrained. As a result, it is possible to increase the spring constant (spring constant in the width direction of the vehicle) of the rubber-like elastic body 3 to the same extent as the structure in which the metal plate having the same size as the corrugated portion is provided.
[0022]
[B] As a means for increasing the spring constant of the rubber-like elastic body 3, there is no need to take a means of welding a plurality of metal plates and embedding the rubber-like elastic body 3 as in the prior art. It can be unnecessary. In addition, the intermediate plates 4 and 5 can be formed by pressing, so that the intermediate plates 4 and 5 can be manufactured at a low cost, and the intermediate plates 4 and 5 are lighter than a structure in which a plurality of metal plates are welded and fixed to form the intermediate plate. Can be
[0023]
[C] Since the rubber-like elastic body is not restrained in the axial direction (up-down direction) of the inner and outer cylinders 1 and 2, the spring constant of the rubber-like elastic body 3 increases in the axial direction of the inner and outer cylinders 1 and 2. Can be suppressed, and a decrease in ride comfort of the vehicle can be prevented.
[0024]
[D] When manufacturing the member mount having the above structure, the inner and outer cylinders 1 and 2 are attached to the lower mold, and the lower portions of both ends 10 of the intermediate plates 4 and 5 are fitted into fitting holes formed in the lower mold. The lower end side of the corrugated portion 11 is placed on the receiving surface of the lower mold, and the fitting holes formed in the upper mold are fitted into the upper portions of both ends 10 of the intermediate plates 4 and 5. In this state, the rubber-like elastic body can be vulcanized and bonded.
[0025]
In this manufacturing process, what is placed on the receiving surface of the lower mold is the corrugated portion 11 of the intermediate plates 4 and 5, and since the corrugated portion 11 is curved along the inner and outer cylinders 1 and 2, The sitting of the intermediate plates 4 and 5 with respect to the receiving surface of the mold is improved, and the posture of the intermediate plates 4 and 5 can be stabilized. As a result, the fitting holes on the upper mold side can be smoothly fitted to the upper portions of both ends 10 of the intermediate plates 4 and 5, and the posture of the intermediate plates 4 and 5 is corrected before the upper mold is covered. You don't have to.
[0026]
[E] Since both end portions 10 of the intermediate plates 4 and 5 are formed in a non-corrugated flat shape, the fitting holes of the upper and lower dies for the intermediate plates 4 and 5 do not need to be formed in a corrugated shape. Modification of the mold to make the hole corrugated can be eliminated.
[0027]
[Second embodiment]
FIGS. 6 to 8 show a vertical suspension bush (corresponding to an anti-vibration device) provided between the lower arm of the automobile and the vehicle body frame constituting the suspension mechanism so that the axis of the vehicle extends vertically.
[0028]
In this suspension bush, an inner cylinder 1 through which a mounting bolt is inserted and an outer cylinder 2 which is thinner and shorter than the inner cylinder 1 are connected by a rubber-like elastic body 3 (a vibration-proof base) interposed therebetween. Then, a pair of intermediate plates 4 and 5, which sandwich the inner cylinder 1, are embedded in the center of the rubber-like elastic body 3 in the radial direction of the inner and outer cylinders 1 and 2, and a hole is formed in the rubber-like elastic body 3. It is configured. Reference numeral 15 denotes a space that penetrates the inner and outer cylinders 1 and 2 in the axial direction, and 14 denotes a stopper that regulates excessive relative displacement between the inner cylinder 1 and the outer cylinder 2. The stopper 14 is made of a rubber-like elastic body.
[0029]
As will be described later, the intermediate plates 4 and 5 are members for setting the spring constant of the rubber-like elastic body 3 low in the front-rear direction of the automobile and high in the width direction (left-right direction on the paper).
[0030]
Both the intermediate plates 4 are made of metal and have the same shape as the intermediate plate 4 of the first embodiment shown in FIGS. To be repeated, as shown in FIGS. 4 and 5, each of the intermediate plates 4 and 5 is formed in a curved shape along the peripheral surface of the inner and outer cylinders 1 and 2 and both ends of the inner and outer cylinders 1 and 2 as viewed in the axial direction. The portions 10 (both ends 10 of the intermediate plates 4 and 5 in the directions corresponding to the circumferential directions of the inner and outer cylinders 1 and 2) are formed in a non-corrugated flat shape, and the top and the bottom are formed into a corrugated arc shape between them. It is formed. The two end portions 10 of the intermediate plates 4 and 5 extend to one end and the other end in the axial direction of the inner and outer cylinders 1 and 2 than the corrugated portion 11 therebetween.
[0031]
The suspension bush having the above structure is press-fitted into a hole on the lower arm side so that the pair of intermediate plates 4 and 5 are aligned in the width direction of the vehicle, and is fixed to the vehicle body frame with mounting bolts inserted through the inner cylinder 3. Is done.
[0032]
In other words, in the above suspension bush, by embedding the pair of intermediate plates 4 and 5 in the rubber-like elastic body 3, the spring constant in the direction in which the two intermediate plates 4 and 5 are arranged is increased. By lowering the constant and increasing the spring constant in the width direction of the vehicle, the riding comfort and steering stability of the vehicle are improved. Further, by configuring the intermediate plates 4 and 5 as described above, the same operation as [A] to [E] of [First Embodiment] can be achieved.
[0033]
[Another embodiment]
The corrugated portion 11 of the intermediate plate 4 is not limited to a corrugated waveform at the top and bottom, but may be formed in a square or triangular wave shape.
[0034]
【The invention's effect】
According to the configuration of the first aspect, the above operations [A] to [C] can reduce the weight and the production cost without causing a problem such as a decrease in ride comfort in the vertical direction of the vehicle. It is possible to provide an anti-vibration device that can be used.
[0035]
According to the configuration of the second aspect, the above operations [A], [D], and [E] can simplify the manufacturing operation, and can eliminate the need for remodeling the mold to make the fitting hole corrugated. As a result, the production cost could be further reduced.
[0036]
According to the configuration of claim 3, it is possible to provide a member mount capable of obtaining the same effect as that of claim 1 or 2, and according to the configuration of claim 4, the same effect as that of claim 1 or 2. Can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of a member mount. FIG. 2 is a vertical front view of a member mount. FIG. 3 is a bottom view of a member mount. FIG. 4 is a plan view of an intermediate plate. FIG. 5 is a rear view of an intermediate plate. FIG. 7 is a sectional view taken along line AA of FIG. 6 FIG. 8 is a sectional view taken along line BB of FIG. 7 FIG. 9 is a plan view of a conventional member mount FIG. Front view [FIG. 11] Bottom view of conventional member mount [FIG. 12] Plan view of conventional intermediate plate [FIG. 13] Rear view of conventional intermediate plate [Description of reference numerals]
DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Rubber-like elastic bodies 4, 5 Intermediate plate 10 Both ends 11 of an intermediate plate Corrugated part

Claims (4)

A vibration isolator in which an inner cylinder and an outer cylinder are connected by a rubber-like elastic body interposed therebetween, and a pair of intermediate plates positioned so as to sandwich the inner cylinder is embedded in the rubber-like elastic body. ,
An anti-vibration device in which the pair of intermediate plates are formed in a wave shape when viewed in the axial direction of the inner and outer cylinders. The intermediate plate is formed in a curved shape along the peripheral surface of the inner and outer cylinders, and both ends of the intermediate plate in a direction corresponding to the circumferential direction of the inner and outer cylinders are formed in a non-corrugated flat shape, and the 2. The vibration isolator according to claim 1, wherein the inner and outer cylinders extend to one end and the other end in the axial direction. The vibration isolator according to claim 1 or 2, wherein the vibration isolator is configured as a member mount provided between the suspension member and the body frame. The anti-vibration device according to claim 1 or 2, wherein the anti-vibration device is configured as a suspension bush provided in the suspension mechanism.

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