JP3696580B2 - Vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, an inner cylinder and an outer cylinder are connected by a rubber-like elastic body interposed between them, and a pair of intermediate plates located between the inner cylinder are embedded in the rubber-like elastic body. Relates to the device.
[0002]
[Prior art]
As an example of this type of vibration isolator, there are a member mount provided between a suspension member of an automobile and a vehicle body frame, and a suspension bush provided in a pivot portion of the suspension mechanism. In these vibration isolators, a pair of rubber elastic bodies are provided. By embedding the intermediate plate, the spring constant in the direction in which both intermediate plates are arranged is increased.
[0003]
A vibration isolator is attached to the vehicle body frame or the like so that the direction in which both intermediate plates are aligned is in the width direction of the automobile, thereby lowering the spring constant of the vibration isolator in the longitudinal direction of the automobile and increasing in the width direction of the automobile. In order to improve the ride comfort and handling stability of the car.
[0004]
By the way, if the intermediate plate is composed of a single thin metal plate in the above vibration isolator, the spring constant in the width direction of the automobile cannot be increased to a desired height. If it is made of a metal plate, the spring constant can be increased, but the weight is increased, and the spring constant in the front-rear direction of the automobile is easily increased. In addition, in the structure in which the single 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 ride comfort and handling stability of the automobile are sufficiently improved. I can't.
[0005]
Therefore, conventionally, as shown in FIGS. 9 to 13, the intermediate plates 4 and 5 are paired with a pair of small arc-shaped first metal plates 20, which are welded and fixed so as to sandwich the central portion of the first intermediate metal plate portion 20 having a large arc shape. 2 intermediate metal plate portions 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 that the welding of the first intermediate metal plate portion 20 and the second intermediate metal plate portions 21 and 22 is costly and the manufacturing cost is increased.
[0007]
As a technique for solving this problem, there is a technique in which a central portion of an intermediate plate made of a single metal plate is recessed in the radial direction of the inner and outer cylinders to form a recess [see Japanese Utility Model Publication No. 6-76730]. According to this technique, since the rubber-like elastic body portion in the recess is restrained from the inner surface of the recess and cannot function as an elastic body, the spring constant can be increased, and the weight can be reduced. Production costs can be reduced.
[0008]
However, in the above technique, the rubber-like elastic body portion in the concave portion is also restrained 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 the spring constant in the vertical direction. The ride becomes higher and the ride comfort is lowered. Therefore, a new measure to lower 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 reduction and manufacturing cost reduction without causing problems such as a decrease in ride comfort in the vertical direction of the vehicle. The point is to provide a vibration device.
[0010]
[Means for Solving the Problems]
The structure of the invention according to claim 1 is:
The inner cylinder and the outer cylinder are connected by a rubber-like elastic body interposed therebetween, and a pair of intermediate plates located between the inner cylinder are embedded in the rubber-like elastic body portion connecting the inner cylinder and the outer cylinder. Anti-vibration device
Forming the pair of intermediate plates 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 circumferential surface of the inner and outer cylinders, and both end portions 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. The inner and outer cylinders are extended to one end side and the other end side in the axial direction.
[0012]
The structure of the invention according to claim 2 is the structure of the invention according to claim 1 ,
Lies in that is configured to a member mount provided between the suspension members and the body frame.
[0013]
The configuration of the invention according to claim 3, in the configuration of the invention according to claim 1,
The suspension bush is provided in the suspension mechanism.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
[First embodiment]
1 to 3, a member mount for an automobile that reduces vibration input and suppresses vibration in a state where it is assembled to a vehicle body frame and a suspension member below the vehicle body frame. Equivalent).
[0016]
This member mount includes an inner cylinder 1 through which a bolt for mounting to a vehicle body frame (hereinafter referred to as “mounting bolt”) is inserted, and an outer cylinder 2 that is thinner and shorter than the inner cylinder 1 between them. A pair of intermediate plates 4 which are connected by an interposed rubber-like elastic body 3 (which is an anti-vibration base) and are located with the inner cylinder 1 sandwiched between the inner and outer cylinders 1 and 2 in the radial direction at the center of the rubber-like elastic body 3. , 5 are embedded. As will be described later, the intermediate plates 4 and 5 are members for increasing the spring constant of the rubber-like elastic body 3 in the front-rear direction of the automobile and in the width direction (left-right direction on the paper surface).
[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 an outer cylinder flange 9 abutted against the lower surface of the suspension member at the lower end thereof. Is bent, and a rubber-like elastic projection 12 connected to the rubber-like elastic body 3 is supported on the outer cylinder flange 9. Further, an inner cylinder flange 6 is formed on the upper end portion of the inner cylinder 1 so as to abut against the mounting surface of the body frame. Although not shown, a stopper fitting is attached to the lower end portion 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]
Both the intermediate plates 4 and 5 are made of metal, and one of the intermediate plates 4 is arranged on one divided outer cylinder 7 side, and the other intermediate plate 5 is arranged on the other divided outer cylinder 8 side. 4 and 5, the intermediate plates 4 and 5 are formed in a curved shape along the peripheral surfaces of the inner and outer tubes 1 and 2, and both end portions 10 in the axial direction of the inner and outer tubes 1 and 2 are viewed. (Both ends 10 of the intermediate plates 4 and 5 in the direction corresponding to the circumferential direction of the inner and outer cylinders 1 and 2) are formed in a non-corrugated flat shape, and the top and bottom are formed in a wave shape with an arc between them. It is. The both end portions 10 of the intermediate plates 4 and 5 are extended to one end side and the other end side in the axial direction of the inner and outer cylinders 1 and 2 rather than the corrugated portion 11 between them.
[0019]
As shown in FIG. 2, the member mount having the above structure has a vertical posture in which the inner cylinder flange 6 side is on the upper side and the outer cylinder flange 9 side is on the lower side, and the pair of intermediate plates 4 and 5 are arranged in the width direction of the automobile. In order to be in a state, it 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 mounting bolts inserted into the inner cylinder 3.
[0020]
That is, in the above-described member mount, 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 both the intermediate plates 4 and 5 are arranged is increased, and thereby the spring is moved in the longitudinal direction of the automobile. The constant is lowered and the spring constant is increased in the width direction of the vehicle to improve the ride comfort and handling stability of the vehicle. Furthermore, the following effect | action can be show | played by having comprised the said intermediate | middle plates 4 and 5 as mentioned above.
[0021]
[A] Since the intermediate plates 4 and 5 are formed in a waveform when viewed from the axial direction of the inner and outer cylinders 1 and 2, the rubber-like elastic body portion in the recess is provided for each recess corresponding to each wave of the intermediate plate 4. For example, one non-corrugated recess having the same size as the corrugated portion (that is, one recess having a total size of each wave) is more rigid than a structure in which the rubber-like elastic body portion is constrained. The rubber-like elastic body portion can be restrained. As a result, the spring constant of the rubber-like elastic body 3 (the spring constant in the width direction of the automobile) can be increased to the same extent as in the structure in which the metal plate portion 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, it is not necessary to take a means of welding a plurality of metal plates and embedding them in the rubber-like elastic body 3 as in the prior art. It can be made unnecessary. The intermediate plates 4 and 5 can be formed by pressing, can be manufactured at 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 (vertical direction) of the inner and outer cylinders 1 and 2, the spring constant of the rubber-like elastic body 3 is increased in the axial direction of the inner and outer cylinders 1 and 2. Can be suppressed, and the ride comfort of the automobile can be prevented from being lowered.
[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 end portions 10 of the intermediate plates 4 and 5 are fitted into the 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 to the upper portions of the both end portions 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, the corrugated portion 11 of the intermediate plates 4 and 5 is placed on the receiving surface of the lower mold, and 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. Thereby, the fitting hole on the upper mold side can be smoothly fitted to the upper part of the both end portions 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 do n’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 upper and lower mold fitting holes for the intermediate plates 4 and 5 do not have to be formed in a corrugated shape. It is possible to eliminate the need for mold remodeling for corrugated holes.
[0027]
[Second Embodiment]
FIG. 6 to FIG. 8 show a vertically installed suspension bush (corresponding to a vibration isolator) provided between the lower arm of the automobile constituting the suspension mechanism and the vehicle body frame in a posture along the vertical direction.
[0028]
This suspension bush connects 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 by a rubber-like elastic body 3 (which is a vibration-isolating base) interposed therebetween. Then, a pair of intermediate plates 4 and 5 located between the inner cylinder 1 is embedded in the central portion 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. Configured. Reference numeral 15 denotes a space that penetrates the inner and outer cylinders 1 and 2 in the axial direction, and reference numeral 14 denotes a stopper that restricts 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 surface).
[0030]
Both 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 repeat, as shown in FIGS. 4 and 5, the intermediate plates 4 and 5 are formed in a curved shape along the peripheral surfaces of the inner and outer cylinders 1 and 2, and both ends of the inner and outer cylinders 1 and 2 when viewed in the axial direction. The portion 10 (both end portions 10 of the intermediate plates 4 and 5 in the direction corresponding to the circumferential direction of the inner and outer cylinders 1 and 2) is formed into a non-corrugated flat shape, and the top portion and the bottom portion are formed in an arc shape between them. It is formed. The both end portions 10 of the intermediate plates 4 and 5 are extended to one end side and the other end side in the axial direction of the inner and outer cylinders 1 and 2 rather than the corrugated portion 11 between them.
[0031]
The suspension bush having the above structure is fixedly attached to the vehicle body frame with a mounting bolt that is press-fitted into the hole on the lower arm side so that the pair of intermediate plates 4 and 5 are aligned in the width direction of the automobile, and is inserted into the inner cylinder 3. Is done.
[0032]
In other words, in the suspension bush described above, the pair of intermediate plates 4 and 5 are embedded in the rubber-like elastic body 3, thereby increasing the spring constant in the direction in which both the intermediate plates 4 and 5 are arranged, and thereby the spring in the longitudinal direction of the automobile. The constant is low, and the spring constant is increased in the width direction of the vehicle to improve the ride comfort and handling stability of the vehicle. Further, by configuring the intermediate plates 4 and 5 as described above, the same operations as [A] to [E] in [First Embodiment] can be achieved.
[0033]
[Another embodiment]
The corrugated portion 11 of the intermediate plate 4 is not limited to the corrugated shape at the top and bottom, and 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 actions [A] to [C] can reduce the weight and the manufacturing cost without causing problems such as a decrease in riding comfort in the vertical direction of the vehicle. It was possible to provide an anti-vibration device.
[0035]
According to the configuration of the first aspect, the manufacturing operation can be simplified by the above actions [A], [D], and [E], and it is not necessary to modify the mold for making the fitting hole corrugated. As a result, the production cost could be further reduced.
[0036]
According to the second aspect, it is possible to provide a member mount can provide the same effect as claim 1, according to the configuration of claim 3, to obtain the same effect as claim 1 A suspension bush that can be provided has been provided.
[Brief description of the drawings]
[Fig. 1] Plan view of member mount [Fig. 2] Front view of member mount longitudinally [Fig. 3] Bottom view of member mount [Fig. 4] Plan view of intermediate plate [Fig. 5] Rear view of intermediate plate [Fig. FIG. 7 is a sectional view taken along the line AA in FIG. 6. FIG. 8 is a sectional view taken along the line BB in FIG. 7. FIG. 9 is a plan view of the conventional member mount. 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 [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Rubber-like elastic bodies 4, 5 Intermediate board 10 Both ends 11 of an intermediate board Corrugated part

Claims (3)

The inner cylinder and the outer cylinder are connected by a rubber-like elastic body interposed therebetween, and a pair of intermediate plates located between the inner cylinder are embedded in the rubber-like elastic body portion connecting the inner cylinder and the outer cylinder. Anti-vibration device
Forming the pair of intermediate plates 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 circumferential surface of the inner and outer cylinders, and both end portions 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. A vibration isolator extending to one end side and the other end side in the axial direction of the inner and outer cylinders . The vibration isolator according to claim 1 , wherein the vibration isolator is configured as a member mount provided between the suspension member and the vehicle body frame. 2. The vibration isolator according to claim 1 , wherein the vibration isolator is constituted by a suspension bush provided in the suspension mechanism.

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