JPH0530585U - Fluid filled anti-vibration support device - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress the outward bulging of the side wall of the rubber elastic body that constitutes the main fluid chamber during compression, to promote liquid movement, and to improve durability at the same time. [Structure] On the outer circumference of the inner cylinder 10, two side walls 12 of a rubber elastic body perpendicular to the cylinder axis, and between the side walls 12 are laterally extended laterally from both sides of the inner cylinder 10 and integrally bridged together. A tubular body 20 is formed by partitioning the partition wall 14 of the body into two spaces above and below the partition wall 14 that open to the outer periphery, and an incompressible fluid is sealed in this space portion to form the tubular body 20.
An outer cylinder 22 is fitted to the outer periphery of the main fluid chamber 16, the lower side of the fluid-filled space is defined as the main fluid chamber 16 and the upper side is defined as the sub-fluid chamber 18. In the enclosed vibration-damping support device, a connection band 26 of a rubber elastic body that integrally bridges between the both side walls 12 is provided in the main fluid chamber 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluid-filled anti-vibration support device for use in an automobile engine mount or the like.

[0002]

[Prior Art]

 The characteristics required for this type of fluid filled type vibration damping device are high damping at low frequency vibrations and low vibration transmissibility at high frequency vibrations. Regarding the damping property, the rubber elastic body that constitutes the side wall of the fluid chamber has to be made thin due to the rigidity, so the side wall is simply outside even when it must be compressed during vibration. There is a tendency that the volume does not change enough only by bulging in one direction. For this reason, Japanese Unexamined Patent Application Publication No. 1-164831 discloses a rigid restraint member which is hung between both side walls and restrains both side walls by the restraint member to suppress outward bulge during compression. Be done. This achieves its purpose, but if a restraint member that is different from such a rubber elastic body is hung between the side walls, the durability of the rubber elastic body that is in contact with it is reduced, It may cause cracks.

Therefore, the applicant of the present invention has developed a mass body that penetrates through the main fluid chamber (fluid chamber on the pressure receiving side) to integrally connect the side walls and bridges the inner and outer cylinders in the load direction. We have previously proposed Japanese Patent Application No. 2-133578 for the case where the attached rubber elastic column is provided. These stanchions suppress outward bulging of the side walls during compression, and also prevent sagging, which has been evaluated as a useful means for preventing bulging without damaging the side walls.

[0004]

[Problems to be solved by the device]

 However, in terms of suppressing the bulging of the side wall, this one is still lacking. This is because when the side wall is compressed due to the vibration load, this strut is naturally compressed, and the strut expands laterally within the range of Poisson's ratio (about 0.5), and the side wall is pushed out accordingly. Because there is. The present invention has been devised in view of such a point, and the point is that the member can be compressed by a vibration load by not providing a swelling suppression member corresponding to the support in the vibration load direction. It was designed so that it would not exist.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention has, on the outer circumference of the inner cylinder, two side walls of rubber elastic bodies perpendicular to the cylinder axis, and between these side walls integrally extending laterally from both sides of the inner cylinder. The same rubber elastic bulkhead that is bridged over the top and bottom of this bulkhead is fitted with a tubular body that separates two open spaces on the outer circumference, and an incompressible fluid is sealed in this space. An outer cylinder is fitted around the outer circumference of the cylindrical body, the lower side of this fluid-filled space is used as the main fluid chamber and the upper side is used as the sub-fluid chamber. In the apparatus, there is provided a fluid-filled anti-vibration support device in which a connection band of a rubber elastic body that integrally bridges the both side walls is provided in the main fluid chamber.

[0006]

[Action]

 By taking the above means, that is, since the connecting band of the rubber elastic body that integrally bridges the both side walls is provided independently in the main fluid chamber without connecting to the partition wall, the load is applied. When the inner cylinder (partition wall) and the outer cylinder come close to each other, the force is not directly applied to the connecting band. Therefore, no force is generated to deform the connecting band, and the connecting band acts only to prevent the side wall from expanding outward.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of a fluid-sealed vibration isolation support device according to the present invention, FIG. 2 is a vertical cross-sectional view, and FIG. 3 is a front view. In addition, two side walls 12 of a rubber elastic body provided with a space therebetween, and a partition wall 14 of the same rubber elastic body which is laterally extended from both sides of the inner cylinder 10 in a wing shape to be integrally bridged between the side walls 12. Then, the cylindrical body 20 that separates the two spaces 16 and 18 that are open to the outer circumference above and below this partition is eccentrically mounted upward (in the direction in which the load is applied) and is stretched. Then, an incompressible fluid is sealed in the spaces 16 and 18, an outer cylinder 22 is fitted around the outer periphery of the cylindrical body 20, and the lower side of the fluid sealed spaces 16 and 18 is the main fluid chamber 16 and the upper side. The thing is made into the sub-fluid chamber 18. At the lower end of the main fluid chamber 16, that is, the lower end of the cylindrical body 20, a rubber elastic bridge 24 that integrally bridges between the side walls 12 is left as is the case with the partition wall.

According to the present invention, in the main fluid chamber 16 described above, a connecting band 26 made of a rubber elastic body for integrally bridging the both side walls 12 is provided without communicating with the partition wall 14. In the case where the above-mentioned bridge zone 24 is provided, the bridge zone 24 may be directly used as the connecting zone 26. At this time, since the connecting band 26 does not communicate with the partition wall 14, the connecting band 26 is laterally (laterally) from the outer circumference of the tubular band 20 to the vicinity of the outer circumference of the other end between the partition wall 14 and the bridge band 24. A recessed portion that is recessed is formed, and this recessed portion serves as the main fluid chamber 16.

FIG. 4 is a cross-sectional view showing another embodiment. In this example, another bridge zone 28 that bridges between the both side walls 12 is formed in the above-mentioned recessed portion, similarly to the bridge zone 24. Is formed in a peninsular shape from the outer periphery of the other end of the cylindrical body 20 (bottom of the recess), which also serves as the connecting band 26. Therefore, the main fluid chamber 16 is divided with the bridge zone 28 in between, and a plurality of connecting zones 26 are also formed.

FIG. 5 is also a transverse cross-sectional view showing another embodiment. In this embodiment, the bottom of the recessed portion is a penetrating portion that penetrates to the outer periphery of the cylindrical body 20, and this is used as the main fluid chamber 16 This is what I did. The connecting band 26 is provided in the penetrating portion in the shape of an isolated island. In this example, only one connecting band 26 is provided, but a plurality of connecting bands 26 may be provided as in the previous example.

In addition to the above, a through hole 30 penetrating between the side walls 12 is provided on the sub-fluid chamber 18 side of the partition wall 14 in order to enhance durability, and the cylindrical body 20 is provided in the central outer peripheral portion of the remaining portion. A main mass portion 32 of a rubber elastic body extending to the outer circumference is formed on both sides thereof, and a thinly curved diaphragm portion 34 is formed on the side of the main fluid chamber 16 for facilitating fluid movement. Therefore, the bottom portion of the sub-fluid chamber 18 is formed by the diaphragm portion 34, and is divided into the left and right portions by the main mass portion 32. Further, a ring-shaped reinforcing member 36 is embedded in the outer peripheral side of the cylindrical body 20 by cutting out the respective fluid chambers 16 and 18.

Next, the above-mentioned main fluid chamber 16 and the sub-fluid chamber 18 are communicated with each other by the orifice structure 38, and if the volumes of both fluid chambers 16 and 18 change due to vibration, the movement of the fluid occurs accordingly. It is like this. FIG. 6 is a developed plan view of the cylinder body 20 showing the orifice structure 38 in the case where the main fluid chamber 16 is formed by a recessed portion which is recessed from the outer periphery of the cylinder body 20. The orifice passage 40 that passes through the bottom side of the cylinder to reach the opening is integrally formed on the outer periphery of the cylindrical body 20. At this time, if the orifice passage 40 is formed in a zigzag shape to increase the passage length, the damping property is improved. Further, the sub-fluid chambers 18 are also connected to each other by forming an orifice passage 42 on the outer circumference of the main mass portion 32.

When the main fluid chamber 16 is used as a penetrating portion, the orifice structure 38 cannot take the above-mentioned means. Therefore, a separate orifice ring 46 having an orifice passage 44 formed on the outer circumference as shown in FIG. 7 is fitted to the outer circumference of the slave fluid chamber 18. In this case, since the two sub-fluid chambers 18 are not communicated with each other, the orifice passage 44 is formed with the communication hole 48 communicating with each sub-fluid chamber 18. Further, also in this case, if the orifice passage 44 is formed in a zigzag shape, the passage length becomes long.

[0014]

[Effect of the device]

 The anti-vibration support device configured as described above supports an automobile engine. In this case, the outer cylinder is fixed to the frame, and the weight of the engine is applied to the inner cylinder from the anti-eccentric direction. Install with. As a result, the vibration generated from the engine can be blocked from being transmitted to the chassis and the generated vibration can be damped. In this case, the following effects can be expected. That is, by providing a connecting band in the main fluid chamber that does not communicate with the partition wall and bridges between both side walls, outward deformation of the side wall is suppressed when a load is applied to the inner cylinder, and the main cylinder The amount of fluid movement increases. Vibration energy is consumed by the sufficient fluid movement in this way, and the damping effect is increased. FIG. 8 shows the loss factor (tan δ) -frequency characteristic in the vertical direction perpendicular to the cylinder axis. As is clear from this, the loss factor is not provided, the rubber elastic column is provided, and the above-mentioned connecting band. It can be seen that the height is higher in the order of those provided with (the product of the present invention), which is comparable to that provided with the metal restraining member. On the other hand, the durability of the device of the present invention is far superior to that of the device provided with the restraint member, and the life is improved by 50 to 100%.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fluid filled vibration damping support device.

FIG. 2 is a vertical cross-sectional view of a fluid filled vibration damping support device.

FIG. 3 is a front view of a fluid-filled anti-vibration support device.

FIG. 4 is a cross-sectional view of another embodiment of the fluid filled vibration damping support device.

FIG. 5 is a cross-sectional view of another embodiment of the fluid filled vibration damping support device.

FIG. 6 is a developed plan view of a cylinder showing an orifice structure.

FIG. 7 is a plan view of an orifice ring.

FIG. 8 is a vertical loss factor (tan δ) -frequency characteristic.

[Explanation of symbols]

 10 Inner Cylinder 12 Side Wall 14 Partition Wall 16 Main Fluid Chamber 18 Secondary Fluid Chamber 20 Cylindrical Body 22 Outer Cylinder 24 Bridge Zone 26 Connection Zone 28 Bridge Zone 38 Orifice Structure

Claims (6)

[Scope of utility model registration request] 1. Side walls of two rubber elastic bodies that are perpendicular to the cylinder axis on the outer circumference of the inner cylinder, and between the side walls of the same rubber elastic body that extend laterally from both sides of the inner cylinder and are integrally bridged. A partition body is provided with a tubular body that separates two space portions open to the outer circumference above and below the partition wall, and an incompressible fluid is sealed in this space portion to fit an outer cylinder on the outer circumference of the tubular body. In the fluid-filled anti-vibration support device in which the lower side of the fluid-filled space is a main fluid chamber and the upper side is a sub-fluid chamber, and the main-sub fluid chambers are connected by an orifice structure, A fluid-filled anti-vibration support device provided with a connecting band of a rubber elastic body that integrally bridges between walls. 2. The main fluid chamber is recessed in the left and right direction from the outer periphery of the cylindrical body along the partition wall, leaving a bridge band of a rubber elastic body that integrally bridges between both side walls at the lower end of the cylindrical body like the partition wall. The fluid-filled anti-vibration support device according to claim 1, wherein the bridge-shaped band is a connecting band. 3. The fluid filled vibration damping support device according to claim 2, wherein another bridging band similar to the bridging band is left in a peninsular shape in the concave portion, and a plurality of coupling bands are formed. 4. The fluid-filled antivibration support according to claim 2, wherein the orifice structure is constituted by an orifice passage formed integrally with the outer periphery of the cylindrical body through the bottom side of the recessed portion to the opening. apparatus. 5. The main fluid chamber penetrates from the outer periphery of the tubular body in the left-right direction along the partition wall, leaving a bridge band of a rubber elastic body that integrally bridges between both side walls at the lower end of the tubular body, like the partition wall. The fluid-filled anti-vibration support device according to claim 1, wherein the connection band is formed in an island shape in the penetrating portion. 6. The fluid-filled anti-vibration support device according to claim 5, wherein the orifice structure is constructed by fitting an orifice ring having an orifice passage formed on the outer periphery of the secondary fluid chamber.