JPH08100832A - Vibration isolating device - Google Patents

Abstract

PURPOSE: To provide a vibration isolating device improving durability further without interfering with a constitutional member in the inside, by providing a stopper regulating a limit of level of the relative displacement between inner/outer cylinders by contact with a elastic unit fixed partly onto a circumference of the outer cylinder when generated vibration. CONSTITUTION: In a condition that an inner cylinder 3 of a vibration isolating device 1 is mounted on a vibration generating part and an outer cylinder 2 is mounted on a vibration receiving part, when vibration is received from the vibration generating part, an elastic unit 4 enveloping the inner cylinder 3 is deformed to function so as to damp vibration. In the case of increasing the relative displacement between the outer/inner cylinders 2, 3 by vibration from the vibration generating part to an excessive level of prescribed amount or more, in accordance with a direction of the upper/ lower displacement in the drawing, a lower surface of a portal frame 14 of a stopper 7 is brought into contact with a shock absorbing elastic unit 15 secured to a peripheral surface of the outer cylinder 2, or the elastic unit 4 enveloping an upper surface of the inner cylinder 3 is brought into contact with a shock absorbing elastic unit 6 fixed to an internal peripheral surface of the outer cylinder 2, so that the relative displacement is impeded by a wall surface of the outer cylinder 2 and regulated to a prescribed level or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device used for supporting a power source such as an automobile or an industrial machine, for example, an engine mount, a roll stopper, a bush or the like.

[0002]

2. Description of the Related Art Conventionally, a vibration isolator of this type generally has an outer cylinder connected to one of a vibration generator and a vibration receiver, and a vibration generator and a vibration receiver disposed inside the outer cylinder. Of the inner cylinder connected to the other of the outer cylinder and the vibration damping portion interposed between the outer cylinder and the inner cylinder, and the relative displacement between the outer cylinder and the inner cylinder is excessive when vibration occurs. A stopper is provided inside the anti-vibration device so as to prevent the above problem.

For example, in a conventional vibration damping device 100 shown in FIG. 3, an elastic member (rubber) 103 is arranged between an outer cylinder 101 and an inner cylinder 102, and the elastic members 103 are arranged above and below the elastic member 103. Voids 104, 105 are provided to facilitate deformation. Further, stoppers 10 made of an elastic body made of the same material are formed above and below the elastic member 103 with the gaps therebetween.
6 and 107 are provided. Furthermore, stopper-107
A liquid-filled type vibration isolator 108 is provided on the lower surface of the. When the vibration generating portion such as the engine is now connected to the inner cylinder 102 and the outer cylinder 101 is attached to the vibration receiving portion such as the vehicle body of the vehicle, the elastic member 103 surrounding the inner cylinder by the weight of the vibration generating portion. If the lower surface of the stopper comes into contact with the stopper 107 and further receives vibration, the stopper 107 is displaced by vibration. The stopper-107 cooperates with the liquid-filled type vibration damping means 108 to work to damp the vibration.
When the relative displacement between the inner cylinder and the outer cylinder becomes excessive, the stopper 107 abuts on the partition wall material 109 of the vibration isolating means 108 so that the both function as a unit, and the inner cylinder 102 and the elastic member. Excessive displacement of 103 upward and downward in FIG. 3 is suppressed.

The stopper 106 has an elastic body fixed to the inner wall of the outer cylinder 101, and restricts the excessive displacement deformation of the inner cylinder 102 and the elastic body 103 upward in FIG.

[0005]

However, the conventional stopper described above has the problems described below because the stopper is built inside the vibration isolator.

Since the stopper is arranged inside the apparatus and the inner cylinder portion collides with the stopper, the contact area of the stopper cannot be wide and the collision of the inner cylinder portion is alleviated. A large stress is generated in the elastic body (rubber) of the stopper, and the elastic body is easily fatigued early so that breakage such as cracking or peeling easily occurs. In particular, the stopper 107 in the conventional apparatus shown in FIG. 3 has a drawback that stress at both ends of the plate-shaped stopper increases and fatigue failure easily occurs.

Further, the stopper is apt to be disposed inside so that a complicated structure is likely to be formed, and the degree of freedom in designing the constituent members inside the vibration damping device for damping vibration is suppressed. In particular, in the case of the conventional vibration isolator in which the stopper is connected to the liquid-filled type vibration isolator, the stopper (107) comes into contact with the internal components of the vibration isolator such as the partition wall material. Therefore, in order to prevent damage to these constituent members, it is necessary to increase the strength of the constituent members, which is disadvantageous in terms of weight and cost.

Therefore, in view of the above circumstances, an object of the present invention is to provide a vibration damping device having a stopper which has improved durability and which does not interfere with the components inside the vibration damping device. Is.

[0009]

In order to achieve the above object, in the vibration isolator of the present invention, as described in claim 1, an outer cylinder connected to one of the vibration generating portion and the vibration receiving portion. And a vibration damping portion including an inner cylinder arranged inside the outer cylinder and connected to the other of the vibration generating portion and the vibration receiving portion, and a vibration damping portion interposed between the outer cylinder and the inner cylinder. A device, which is supported by a supporting member connected to the inner cylinder, is installed above the outer peripheral surface of the outer cylinder, and abuts on an elastic body attached to a part of the outer cylinder when vibration occurs. Accordingly, it is characterized in that it is provided with a stopper that regulates the limit of the magnitude of relative displacement between the inner cylinder and the outer cylinder. Furthermore,
As a more preferred application of the present invention, the support member is connected to both end portions of the inner cylinder, and an elastic body is attached to a side of the stopper that abuts an outer peripheral surface of the outer cylinder. The anti-vibration device described in.

[0010]

In the vibration isolator according to the present invention, the stopper for restricting the limit of the relative displacement between the inner cylinder and the outer cylinder when vibration is generated is arranged outside the outer cylinder. As described above, there is no possibility that the inner cylinder portion locally contacts the stopper made of the elastic body to cause early fatigue failure of the stopper. Further, since the contact area of the stopper can be set to be large, the contact force of the stopper is dispersed, the stress applied to the cushioning elastic body arranged at the portion where the stopper abuts is dispersed and relaxed, and the fatigue fracture of the elastic body is prevented. It can be prevented.
When the stopper is constructed as described in claim 2, the rigidity of the frame of the stopper is increased and the abutting force of the stopper is further alleviated to further improve the durability of the stopper. You can

Further, by setting the contact area of the stopper large, the stress applied to the outer cylinder wall supporting the large contact force from the stopper through the elastic body is also dispersed and relaxed at the same time. The degree of freedom in strength design is increased, and a wide range of outer cylinder materials can be selected.

Further, in the case of the vibration isolator including the liquid-filled type vibration isolator as in the conventional example, the stopper directly connected to the vibration isolator is removed and it is arranged outside the outer cylinder. The stopper does not interfere with the internal components of the vibration isolator such as the partition wall material. Therefore, the degree of freedom in designing the shape and structure of these internal constituent members is increased, and the need for increasing the strength of the constituent members is reduced. Make it easy to reduce costs.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view perpendicular to the axial direction of a vibration isolation device according to the present invention. The vibration isolator 1 includes a cylindrical outer cylinder 2, a cylindrical inner cylinder 3, and an elastic body 4 interposed between the outer cylinder 2 and the inner cylinder 3 and vulcanized and bonded thereto. A liquid-filled type vibration damping means 6 having a liquid chamber 5 formed by the elastic body 4 and the inner wall surface of the outer cylinder 2 and a stopper 7 supported by the inner cylinder 3 are mainly configured. There is. As shown in FIG. 1, a gap 8 for assisting the deformation of the elastic body 4 is provided between the upper surface of the elastic body 4 and the inner wall surface of the outer cylinder 2.

A partition material 9 made of a resin material is arranged in the liquid chamber 5 of the liquid-filled type vibration damping means 5 so as to divide the liquid chamber 5 into a main liquid chamber 5A and a sub liquid chamber 5B. It is divided into Further, on the outer peripheral surface of the partition member 9, a limiting passage 10 is formed along the outer peripheral surface, which serves as a passage for the liquid, for almost one round. Further, both the outer peripheral portion of the diaphragm 11 arranged below the partition wall member 9 and sealing the open portion of the liquid chamber 5 and the lower end portion of the outer peripheral surface of the partition wall member 9 are covered with the outer cylinder 2 by the lid member 12. It is firmly fixed by crimping. Further, an air chamber 13 is provided between the diaphragm 11 and the lid member 12 so that the diaphragm 11 can be deformed.

The stopper 7 which is the main part of the present invention
As shown in FIG. 2, which is a side view of the vibration isolator 1 of the present embodiment, is supported on both axial ends of the inner cylinder 3 protruding from both axial ends of the outer cylinder 2 and is supported by the upper outer cylinder of FIG. 2, a gate-shaped frame 14 disposed above, and a cushioning elastic body (rubber) 15 attached to the upper surface of the outer peripheral surface of the outer cylinder 2 so as to face the lower surface of the gate-shaped frame 14. It is composed by.

Further, a cushioning elastic body (rubber) 16 is attached to the inner wall surface of the outer cylinder 2 facing the upper surface of the inner cylinder 3 through the elastic body 4 and the void portion 8, and a diagram of the inner cylinder 3 is shown. 1 It is a stopper that regulates the upward displacement.

Since the vibration isolator according to the present invention is configured as described above, when the relative displacement between the outer cylinder and the inner cylinder becomes excessively large when vibration is generated, the vibration of the outer cylinder relative to the outer cylinder in FIG. When the inner cylinder is excessively displaced downward, the lower surface of the gate-shaped frame 14 of the stopper 7 according to the present invention arranged outside the outer cylinder 2 is attached to the outer peripheral surface of the outer cylinder 2. Further, it comes into contact with the cushioning elastic body (rubber) 15 to stop the downward displacement. Further, when the inner cylinder is excessively displaced upward with respect to the outer cylinder, the elastic body 4 covering the upper surface of the inner cylinder 3 is attached to the inner wall surface of the outer cylinder 2 for the cushioning elastic body (rubber). ) 16 to stop the upward displacement.

Next, the operation of this embodiment will be described.
When the inner cylinder 3 of the vibration isolation device 1 is attached to a vibration generating portion such as an engine of a vehicle, and the outer cylinder 2 is attached to a vibration receiving portion such as a vehicle body, when vibration is received from the vibration generating portion, the inner cylinder The elastic body 4 enclosing 3 functions to deform and damp vibrations. At the same time, inside the liquid-filled type vibration damping means 6 connected to the elastic body 4, the main liquid chamber 5
A expands and contracts, the liquid in the liquid chamber 5 moves back and forth between the main liquid chamber 5A and the sub liquid chamber 5B through the restriction passage 10, and the diaphragm 1
A series of motions of deforming 1 occur, and the viscous resistance and pressure change of the liquid generated thereby function to attenuate the vibration.

When the relative displacement between the outer cylinder 2 and the inner cylinder 3 becomes excessively large by a predetermined amount or more due to the vibration from the vibration generating portion, the relative displacement according to the vertical displacement direction in FIG. ,
The lower surface of the gate-shaped frame 14 of the stopper 7 according to the present invention and the cushioning elastic body 15 fixed to the outer peripheral surface of the outer cylinder 2 come into contact with each other, or the elastic body that covers the upper surface of the inner cylinder 3. (Rubber)
4 and the cushioning elastic body 16 adhered to the inner wall surface of the outer cylinder 2 come into contact with each other, the relative displacement is blocked by the wall surface of the outer cylinder and is restricted to a predetermined size or less.

In the embodiment of the present invention, the abutment surface of the portal frame 14 according to the present invention, which serves as one stopper, that is, the lower surface of the portal frame 14 and the cushioning elastic body 15 opposed thereto. Since the area of the contact surface of can be freely expanded irrespective of the shape of the vibration isolator and the internal structure, the surface pressure of the contact surface can be sufficiently dispersed and reduced, and the cushioning elastic body (rubber) The durability can be improved.

Further, since the stopper according to the present invention is set outside the vibration isolator, the structure inside the vibration isolator is simplified and the degree of freedom in designing the constituent members is increased. For example, the shape of the elastic body 4 may be changed to increase its size to improve the damping effect, or the liquid chamber 5 of the liquid-filled type vibration damping means 6 may be enlarged to improve the damping effect of the means. You can

Further, unlike the conventional apparatus described in FIG. 3, since the stopper does not come into contact with the internal constituent members of the liquid-filled type vibration damping means 6, such as the partition wall material 9 and the limiting passage 10, these stoppers are not provided. It is not necessary to increase the strength of the members, and various lightweight and inexpensive materials such as resin materials can be selected and used. Furthermore, the cushioning elastic body 15 installed on the outer wall surface of the outer cylinder 2
Are completely isolated from the inner cylinder 3 and the elastic body 4 and do not interfere with each other, so that the material of the elastic body for cushioning can be freely selected and the function of the vibration isolator can be prevented without degrading the function of the vibration isolator. The durability can be improved.

In the above embodiment, the outer cylinder 2 is connected to the vehicle body side which is the vibration receiving portion, and the inner cylinder 3 is connected to the engine side which is the vibration generating portion. Also good. Further, in the above-mentioned embodiment, the purpose is to prevent the vibration of the engine mounted on the automobile.
For example, it can be applied to vibration proofing of various other machines such as engine mounts of automobiles and general industrial machines.

Further, the shapes and dimensions of the outer cylinder, the inner cylinder, the elastic body, the liquid-filled vibration isolator and the stopper are not limited to those in the above-mentioned embodiment, and for example, the liquid-filled liquid as described above is used. The stopper of the present invention can also be applied to a vibration isolator that does not have a built-in type vibration damping means inside the outer cylinder but simply has an outer cylinder, an inner cylinder, and an elastic body joined to both as main constituent elements.

[0025]

As described above, in the vibration isolator according to the present invention, the durability of the components of the vibration isolator is improved and at the same time, it is incorporated into the components inside the vibration isolator, especially inside the device. A stopper for each component of the liquid-filled type vibration damping device
Since there is no contact interference, the degree of freedom in designing the shape materials of these internal constituent members is increased, and the performance and weight reduction or cost reduction of the vibration isolator can be achieved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a vibration isolation device according to an embodiment of the present invention.

FIG. 2 is a side view of the vibration damping device according to the embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a conventional vibration damping device.

[Explanation of symbols]

 1 Vibration Isolator 2 Outer Cylinder 3 Inner Cylinder 4 Elastic Body 5 Liquid Chamber 5A Main Liquid Chamber 5B Sub Liquid Chamber 6 Liquid Filled Vibration Isolator 7 Stopper 8 Void 9 Partition Material 10 Restriction Passage 11 Diaphragm 12 Lid 13 Air Chamber 14 Gate Frame 15 Buffer Elastic Body (Rubber) 16 Buffer Elastic Body (Rubber) 100 Vibration Isolator 101 Outer Cylinder 102 Inner Cylinder 103 Elastic Body (Rubber) 104 Gap 105 Gap 106 Stopper 107 Stopper 108 Liquid Enclosed anti-vibration means 109 Partition material

Claims (2)

[Claims] 1. An outer cylinder connected to one of the vibration generator and the vibration receiver, an inner cylinder arranged inside the outer cylinder and connected to the other of the vibration generator and the vibration receiver, and the outer cylinder. A vibration damping device comprising a vibration damping portion interposed between a cylinder and the inner cylinder, the vibration damping device being installed above an outer peripheral surface of the outer cylinder supported by a support member connected to the inner cylinder. And a stopper for restricting a limit of relative displacement between the inner cylinder and the outer cylinder by contacting an elastic body attached to a part of a circumference of the outer cylinder. Anti-vibration device. 2. The method according to claim 1, wherein the support member is connected to both end portions of the inner cylinder, and an elastic body is attached to a side of the stopper that abuts an outer peripheral surface of the outer cylinder. Anti-vibration device.