JP2976385B2 - Liquid filled anti-vibration support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled anti-vibration support device suitable for use in a roll insulator for preventing longitudinal vibration of an engine from being transmitted to a vehicle body.

[0002]

2. Description of the Related Art Since a liquid-filled anti-vibration support device used for a roll insulator is used to prevent a large-amplitude vibration of a vehicle body due to sudden start or sudden braking, the anti-vibration support device has a high damping function. The significance of using a liquid-filled type is significant. Under such a concept, the present applicant has previously proposed a liquid-filled roll insulator as a “liquid-sealed elastic bush” (Japanese Patent Laid-Open No. 63-266239). It has been found that, by curving the side wall constituting the liquid chamber inward, a pump action that promotes liquid movement during vibration is promoted.

[0003]

However, in recent years, with the trend toward advanced vehicles such as low vibration and quietness, the problem of damping of a roll insulator against idling vibration of small amplitude has become a problem. . Under such a demand, the above-mentioned proposal cannot be said to be sufficient, and it has become necessary to further enhance the pump action for enhancing the damping function. The present invention solves such a problem, and, in summary, succeeds in further enhancing the pump action by devising the curvature of the side wall.

[0004]

To solve the above problems, the present invention takes the following measures. First, a rubber is formed on the outer periphery of the inner cylinder facing forward and backward, a partition wall extending from the inner cylinder to the left and right, and a side wall extending continuously from the inner cylinder to the inner cylinder at right angles to the inner cylinder continuously at the front and rear ends of the partition wall. In addition to mounting the elastic cylinder, an outer cylinder is attached to the outer periphery of the rubber elastic cylinder, and liquid is sealed in two spaces separated above and below the partition wall to form a liquid chamber. In the liquid filled vibration isolator, the front and rear side walls above and below the bulkhead in the central longitudinal section are connected to the peripheral part perpendicular to the inner cylinder formed on the inner cylinder side with a smooth curved surface and connected to the center. The liquid-filled vibration isolator is formed by projecting each other until the outer surface enters further inward than the inner surface of the peripheral portion and bending it into a substantially arc shape, and changing the radius of curvature of this curved portion between those above and below the partition. A support device is provided.

Next, on the outer periphery of the inner cylinder facing forward and backward, partition walls projecting from the inner cylinder to the left and right, and side walls extending continuously from the inner cylinder to the inner cylinder at right and left angles to the front and rear ends of the partition wall, respectively. In addition to mounting a rubber elastic cylinder consisting of the following, an outer cylinder is attached to the outer periphery of the rubber elastic cylinder, and liquid is sealed in two spaces separated above and below the partition wall to form a liquid chamber, and these liquids are formed. in the liquid communicable with the liquid filled vibration isolating device between chambers, contact the central vertical plane
Together takes the respective front and rear side walls that exists above and below the partition wall, to the central portion exterior surface connects with the cylinder and perpendicular to the peripheral portion and the smooth curved surface within which is formed on the inner tube side from entering the more inward than the peripheral portion inner surface Provided is a liquid-filled anti-vibration support device that is projected to bend into a substantially circular arc shape and that the thickness of the curved portion is changed between upper and lower partitions.

Further, on the outer periphery of the inner cylinder facing forward and backward, a partition wall extending from the inner cylinder to the left and right, and a side wall extending continuously from the inner cylinder to the inner cylinder at right angles to the front and rear ends of the partition wall, respectively. A rubber elastic cylinder made up of a rubber elastic cylinder, and an outer cylinder attached to the outer periphery of the rubber elastic cylinder, and a liquid filled in two spaces formed above and below the partition wall to form a liquid chamber. in the liquid communicable with the liquid filled vibration isolating device between, you in central longitudinal section
Together takes the respective front and rear side walls that exists above and below the partition wall, to the central portion exterior surface connects with the cylinder and perpendicular to the peripheral portion and the smooth curved surface within which is formed on the inner tube side from entering the more inward than the peripheral portion inner surface While projecting and bending it into a substantially arc shape, while changing the radius of curvature of this curved part with those above and below the partition,
An object of the present invention is to provide a liquid-filled anti-vibration support device in which the thickness of a larger radius of curvature is made smaller than the thickness of a smaller radius of curvature .

[0007]

By taking each of the above measures, it has been found that the loss angle in the idling vibration range increases as compared with the conventional one. This means that by taking such a measure, the rigidity of the liquid chamber will be different between the upper and lower liquid chambers, and as a result, the contraction and expansion of the liquid chamber will be facilitated, and the pump action will be enhanced. That is.

[0008]

FIG. 1 is a front view of a liquid-filled anti-vibration support device according to the present invention, FIG. 2 is a partially cutaway sectional view taken along the line AA of FIG.
FIG. 4 is a cross-sectional view (central vertical cross-sectional view ) of FIG.
The liquid-filled anti-vibration support device includes a partition wall 12 projecting left and right from the inner cylinder 10 around the outer circumference of the inner cylinder 10 placed forward and backward. A rubber elastic cylinder consisting of the inner cylinder 10 and two side walls 14 projecting circularly at right angles from the inner cylinder 10 continuously at the front and rear ends is integrally formed, and an outer cylinder 16 is provided around the outer periphery of the rubber elastic cylinder. It is fitted (press-fitted). As a result, a space is formed between the inner and outer cylinders 10 and 16 which is vertically separated with the partition wall 12 interposed therebetween.
If a liquid is sealed in this space when press-fitting 6, this space becomes a liquid-sealed liquid chamber 18. In the vicinity of the outer peripheral end of the side wall 14, a sleeve-shaped core 20 in which a portion where the liquid chamber 18 is located is cut out like a window is sealed and reinforced.

The liquid sealed in each liquid chamber 18 is configured to be able to communicate with each other. That is, a passage groove 22 is formed in the outer periphery of the partition wall 12 in the circumferential direction so that the liquid sealed in each liquid chamber 18 can flow through the passage groove 22.
A hole 2 communicating with the liquid chamber 18 is provided above one liquid chamber 18.
4 is formed, and a semicircular orifice ring 28 formed on the outer periphery of a flow groove 26 communicating with the hole 24 and continuous with the passage groove 22 is covered. This allows
When a relative displacement occurs between the inner cylinder 10 and the outer cylinder 16 and one of the liquid chambers 18 contracts and the other liquid chamber 18 expands, the liquid sealed in the contracted liquid chamber 18 passes through the hole 24. It reaches the expansion-side liquid chamber 18 through the groove 26 and the passage groove 22.

The upper and lower side walls 14 of the partition wall 12, that is, the side walls 14 of each liquid chamber 18 are substantially circular in shape by projecting toward the other side until the innermost portions thereof are almost in contact with each other so as to reduce the volume of the liquid chamber 18. In addition to this, the radius of curvature of the side wall 14 is set to be larger in either the upper or lower direction (see FIG. 1). The vibration applied to the liquid filling vibration isolator is input from the top to the bottom with respect to the inner cylinder 10 in the state of FIG. 1. In such a case, the curvature of the side wall 14 of the upper liquid chamber 18 is reduced . It is usual to reduce the radius of curvature and increase it below. However, the same effect is obtained even if the direction is reversed. The large curvature in this case refers to the radius of curvature, and includes not only the amount of inward intrusion but also a large curved area.
Further, the curvature of the side wall 14 is three-dimensionally curved by connecting all the portions where the curvature intersects the straight portions of the side wall 14 with a smooth curved surface (see FIGS. 1 to 3). In this case, at least a peripheral portion which is a straight portion perpendicular to the inner cylinder 10 is present around the curved inner cylinder 10 side, and the peripheral portion and the curved portion are connected by a smooth curved surface (see FIG. 3). Then, the outer surface of the central portion of the curved side wall 14 is protruded inward from the inner surface of the peripheral portion (see FIG. 3).

It has been found that the use of the liquid-filled anti-vibration support device having such a configuration as a roll insulator greatly attenuates the vehicle body natural vibration during idling. FIG. 5 is a characteristic showing the relationship between the frequency (Hz) and the loss angle (δ) when the peak of the loss angle is tuned to around 25 Hz (in the case of a four-cylinder engine) which is the natural frequency of the vehicle body when idling. In this frequency range, it was found that the peak of the loss angle of the product of the present invention was higher than that of the conventional product in which the magnitude of the curve was the same in the vertical direction.

Next, when the thickness of the portion where the side wall 14 is curved is changed up and down, it has been found that in this case as well, a high damping property is exhibited. FIG. 6 shows the characteristics indicating this. It was found that the loss angle of the product of the present invention had a higher peak in the idling vibration region than that of the conventional product. In this case, either the thicker or the thinner in the vibration input direction may be brought to the input side.

Further, when the radius of curvature of the curvature is changed and the thickness is changed, it has been found that the peak of the loss angle is further increased. FIG. 7 shows the characteristics indicating this, and it was found that the peak of the loss angle increased synergistically with the previous two examples. In this case, the wall thickness in this case is required to be thinner on the side having a larger curvature radius of curvature.

FIGS. 5 to 7 also show the characteristics of the absolute spring constant (K) with respect to the frequency. However, in the case of the liquid-filled type, the absolute spring constant sharply drops immediately before the loss angle reaches its peak. It is known that if the peak of the loss angle is increased, the decrease of the absolute spring constant is correspondingly increased, and accordingly, there is an effect that the vibration isolation property is improved.

FIG. 8 is a vertical sectional view of a liquid-filled anti-vibration support device equipped with a stopper 30 for restricting excessive displacement of the inner cylinder 10,
FIG. 9 is a front view of the stopper. The stopper 30 has a mounting hole 32 formed at the center and an overhang 34 formed above and below. The mounting hole 3 is formed by using two stoppers 30.
2 is fitted and attached to both ends of the inner cylinder 10 outside the side wall 14. The stopper 30 is also made of a rubber elastic body in which a core metal 36 and the like are sealed. As a result, when the inner cylinder 10 is displaced to a certain degree or more, the tip of the protruding portion 34 hits the outer cylinder 16 and further displacement is restricted.

[0016]

As described above, since the present invention has the above-described structure, it promotes the pump action for promoting the liquid movement between the liquid chambers, and raises the peak of the loss angle in the idling vibration region to thereby achieve high damping. Demonstrate. At the same time, the absolute spring constant immediately before the loss angle reaches its peak is reduced, and the vibration isolation is improved. Furthermore, if the peak of the loss angle becomes higher, the skirt portion of the peak will inevitably become higher, so that the rising range of the loss angle spreads to the low frequency range, and the damping effect is also provided for shock vibration around 5 Hz due to sudden acceleration / deceleration. Demonstrate.

[Brief description of the drawings]

FIG. 1 is a front view of a liquid-filled anti-vibration support device according to an embodiment of the present invention.

FIG. 2 is a partial sectional view taken along the line AA of FIG. 1 showing the embodiment of the present invention.

FIG. 3 is a sectional view taken along the line BB of FIG. 1 showing the embodiment of the present invention.

FIG. 4 is a cross-sectional view of the embodiment of the present invention taken along the line CC of FIG. 3;

FIG. 5 shows the characteristics of the liquid-filled anti-vibration support device according to the embodiment of the present invention.

FIG. 6 shows the characteristics of the liquid-filled anti-vibration support device according to the embodiment of the present invention.

FIG. 7 shows characteristics of a liquid-filled vibration-proof supporting device showing an embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of a liquid-filled anti-vibration support device equipped with a stopper according to an embodiment of the present invention.

FIG. 9 is a front view of a stopper according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Inner cylinder 12 Partition wall 14 Side wall 15 Straight part of side wall 16 Outer cylinder 18 Liquid chamber 9-

Claims (3)

(57) [Claims] 1. A partition wall (12) projecting left and right from the inner cylinder (10) on an outer periphery of the inner cylinder (10) facing forward and backward, and an inner cylinder (continuously extending from front and rear ends of the partition wall (12), respectively). A rubber elastic cylinder comprising an inner cylinder (10) and a side wall (14) projecting in a circular shape at right angles from the inner cylinder (10) is stretched, and an outer cylinder (16) is mounted on the outer periphery of the rubber elastic cylinder, and the partition wall ( addition to the liquid chamber (18) by sealing liquid into two spaces which are隔成above and below the 12), in the liquid liquid filled vibration isolating device capable communicating between these liquid chambers (18), a central longitudinal Partitions on the surface (12)
Each of the front and rear side walls (14) above and below the inner cylinder (1).
The inner tube (10) formed on the 0) side is connected to a peripheral portion perpendicular to the inner tube by a smooth curved surface, and is projected to each other until the outer surface of the central portion enters further inward than the inner surface of the peripheral portion to be curved in a substantially arc shape. A liquid-filled anti-vibration support device in which the radius of curvature of the curved portion is changed between that above and below the partition (12). 2. A partition wall (12) projecting left and right from the inner cylinder (10) on the outer periphery of the inner cylinder (10) facing forward and backward, and an inner cylinder (continuously extending from the front and rear ends of the partition wall (12)). A rubber elastic cylinder comprising an inner cylinder (10) and a side wall (14) projecting in a circular shape at right angles from the inner cylinder (10) is stretched, and an outer cylinder (16) is mounted on the outer periphery of the rubber elastic cylinder, and the partition wall ( addition to the liquid chamber (18) by sealing liquid into two spaces which are隔成above and below the 12), in the liquid liquid filled vibration isolating device capable communicating between these liquid chambers (18), a central longitudinal Partitions on the surface (12)
Each of the front and rear side walls (14) above and below the inner cylinder (1).
The inner tube (10) formed on the 0) side is connected to a peripheral portion perpendicular to the inner tube by a smooth curved surface, and is projected to each other until the outer surface of the central portion enters further inward than the inner surface of the peripheral portion to be curved in a substantially arc shape. A liquid-filled anti-vibration support device in which the thickness of the curved portion is changed between the upper and lower portions of the partition (12). 3. A partition wall (12) projecting left and right from the inner cylinder (10) on the outer periphery of the inner cylinder (10) facing forward and rearward, and the inner cylinder (12) being continuously connected to front and rear ends of the partition wall (12). A rubber elastic cylinder comprising an inner cylinder (10) and a side wall (14) projecting in a circular shape at right angles from the inner cylinder (10) is stretched, and an outer cylinder (16) is mounted on the outer periphery of the rubber elastic cylinder, and the partition wall ( addition to the liquid chamber (18) by sealing liquid into two spaces which are隔成above and below the 12), in the liquid liquid filled vibration isolating device capable communicating between these liquid chambers (18), a central longitudinal Partitions on the surface (12)
Each of the front and rear side walls (14) above and below the inner cylinder (1).
The inner tube (10) formed on the 0) side is connected to a peripheral portion perpendicular to the inner tube by a smooth curved surface, and is projected to each other until the outer surface of the central portion enters further inward than the inner surface of the peripheral portion to be curved in a substantially arc shape. A liquid-filled anti-vibration support device in which the radius of curvature of the curved portion is changed between the upper and lower portions of the partition wall (12), while the thickness of the larger radius of curvature is made smaller than that of the smaller one.