JP2537850Y2 - Center bearing support - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center bearing support and, more particularly, to a center bearing support capable of exhibiting excellent damping properties over a wide range of vibrations from low frequencies to high frequencies.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 5, as a center bearing support for vibration-proofing a propeller shaft in a vehicle such as an automobile, it is known. That is, this center bearing support positions the cylindrical outer ring 54 at a predetermined interval outside the cylindrical inner ring 55,
Between the outer ring 54 and the inner ring 55, the elastic member 51 is vulcanized and molded so that its cross section is substantially U-shaped,
55 are integrally connected.

[0003] A bearing (not shown) is provided on the inner ring 55 side of the center bearing support constructed as described above.
Attached to the propeller shaft (not shown) through
By mounting the outer ring 54 side on the vehicle body (not shown) side, the propeller shaft is supported for vibration isolation.

In general, a propeller shaft generates a wide range of vibrations from a low frequency (for example, vibration at the time of starting) to a high frequency (muffled sound, etc.), so that the propeller shaft can cope with all of these vibrations. It is required to set a high spring in a low frequency range and a low spring in a middle and high frequency range.

However, in the conventional center bearing support constructed as described above, the elastic member 51 has no degree of freedom, so that only one kind of spring constant can be set. The spring constant is set to be low to increase the damping property mainly for the medium-high frequency vibration, and mainly the bellows portion 52 of the elastic member 51 attenuates the medium-high frequency vibration. Here, damping of low-frequency vibration becomes a problem, and the bellows 52 of the elastic member 51 and the annular stopper 53 provided integrally therewith correspond to low-frequency vibration. However, this is not enough, and there is a problem that vibrations in a low frequency range cannot be completely attenuated.

The present invention solves the above-mentioned problems of the prior art, and can exhibit excellent damping properties over a wide range of vibrations from a low frequency range to a high frequency range. It is intended to provide bearing support.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an annular housing and a housing for the housing.
An outer ring fitted on the inner peripheral side and divided into two in the axial direction;
An inner ring provided at a predetermined interval on the inner peripheral side of the outer ring
And an elastic member connecting between the outer ring and the inner ring.
Wherein the elastic member comprises an inner periphery of each of the two outer rings.
Side and the outer circumference of the inner ring, and
Two annular bellows forming a closed annular cavity
Inside the cavity and on the inner peripheral side of the elastic member.
A topper portion, and the stopper portion is provided between the outer peripheral side and the space.
A predetermined gap is formed between the stopper portion and the surface.
Means forming an annular liquid chamber in which liquid is sealed between the inner ring and the inner ring
Is adopted. Further, a means in which a stopper plate is disposed on the outer peripheral side of the stopper portion is employed. Further, a means in which the liquid chamber is provided in an annular shape is employed. The liquid chamber is divided into a plurality of sections by a partition in the circumferential direction, and means for communicating the divided liquid chambers with orifices provided in each partition is adopted.

[0008]

[Function] This invention adopts the above-mentioned means,
When vibration with low frequency and large amplitude is input, the bellows
Large elastic deformation in and out of the direction. In this case, the bellows
Since a closed space is formed inside, the elastic part
An air spring element can be added to the damping properties of the material.
When the bellows deforms inward and outward in the radial direction, the stopper
The inner surface of the bellows abuts the outer periphery of the
It elastically deforms inward and outward in the radial direction following the low portion. And
When the stopper deforms radially in and out, pressure is applied to the liquid chamber.
The liquid moves in the liquid chamber following the deformation of the stopper
I do. And by the cooperation of these, vibration in this frequency range
Is attenuated. In addition, when vibration of small amplitude is input, the bellows part is elastically deformed in and out in the radial direction.
More input vibration is attenuated. In this case, the stopper
No external force is applied until the bellows is displaced.
Of the bellows is sufficient because the displacement of
By setting the number low in advance,
Vibration can be effectively attenuated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. FIGS. 1 and 2 show a first embodiment of a center bearing support according to the present invention. The center bearing support has a cylindrical inner ring 5 and a predetermined space outside the inner ring 5. The outer ring 4a and the outer ring 4a and the outer ring 4a and the outer ring 4a and the outer ring 4a and the outer ring 4b.

The elastic member 1 is made of an elastic material having a low spring constant. As shown in FIG. 2, the elastic member 1 has an annular stopper portion 3 and extends radially outward from both ends of the stopper portion 3. Annular bellows 2a, 2b
A stopper plate 6 is embedded on the outer peripheral side of the stopper portion 3 and an annular concave portion 7 is provided on the inner peripheral side to form an annular liquid chamber 8 between the stopper ring 3 and the inner ring 5.
Is filled with liquid.

The end portions of the bellows portions 2a and 2b stand outward in the axial direction, respectively, and the inner peripheral surfaces of the outer rings 4a and 4b are integrally connected to the standing portions. Also,
The inner ring 5 is press-fitted on the inner peripheral side of the elastic member 1.

When the center bearing support thus constructed is compressed in the axial direction and press-fitted into the cylindrical housing 9, as shown in FIG.
b of the bellows 2a, 2b
Is located on the outer peripheral side of the stopper portion 3.

Next, the operation of the center bearing support shown in the first embodiment will be described. First, when the vibration from the propeller shaft has a low frequency and a large amplitude, the vibration causes the bellows portions 2a and 2b of the elastic member 1 to be largely elastically deformed inward and outward, respectively, and the stopper portion 3 applies a bellows to its outer peripheral surface. When the stoppers 3 are brought into contact with the inner peripheral surfaces of the parts 2a and 2b, they are elastically deformed radially inward and outward. Due to the deformation of the stopper 3, pressure is applied to the liquid chamber 8 inside the stopper 3, and Fluid moves.

As described above, when low-frequency, large-amplitude vibration is input, the elastic deformation of the bellows portions 2a and 2b of the elastic member 1, the elastic deformation of the stopper portion 3, and the viscosity of the fluid inside the liquid chamber 8 due to the movement of the fluid. The resistance can attenuate low frequency, large amplitude vibrations. In this case, the bellows parts 2a, 2b
Has a closed annular space inside,
Adding an air spring element to the damping characteristics of the elastic member 1
And effectively reduce the vibration in this frequency range.
It can be attenuated.

On the other hand, when the vibration from the propeller shaft has a small amplitude at a medium to high frequency, the bellows 2a, 2b,
This vibration can be attenuated by b being elastically deformed inward and outward in the radial direction. In this case, no external force acts until the stopper portion 3 is displaced, and the bellows portions 2a, 2b of the elastic member 1 are not applied. Since only the displacement of the elastic member 1 can sufficiently cope with the vibration, by setting the spring constant of the elastic member 1 low in advance, it is possible to effectively attenuate the vibration in the mid-high frequency range, and to reliably generate the booming noise and the like. Can be blocked.

Further, since the stopper plate 6 is buried on the outer peripheral side of the stopper portion 3, the effect as a dynamic damper can be exhibited, and the setting is made so as to exert the effect as a dynamic damper at a predetermined frequency. Thereby, vibration of a predetermined frequency can be attenuated. Further, when the bellows portion is provided in one place, it is necessary to use an elastic material having a high spring constant, and it is not possible to effectively attenuate the vibration in the middle and high frequency range. By providing them at two locations, an elastic material having a low spring constant can be used.

FIGS. 3 and 4 show a second embodiment of the center bearing support according to the present invention. The center bearing support has a cylindrical inner ring 25 and a predetermined outside of the inner ring 25. , Two cylindrical outer rings 24a, 24b positioned at an interval of the inner ring 25 and the outer ring 24.
a and an elastic member 21 that forms an annular shape and connects the first member 24a and the second member 24b.

The elastic member 21 is made of an elastic material having a low spring constant, and has an annular stopper 23 and annular bellows 22a extending radially outward from both ends of the stopper 23, respectively. 22b. A stopper plate 26 is buried on the outer peripheral side of the stopper portion 23, and an annular concave portion 27 is provided on the inner peripheral side to form an annular liquid chamber 28 with the inner ring 25. Is filled with liquid. The liquid chamber 28
Is divided into a plurality in the circumferential direction by partitions 30, and each partition 3
The liquid chambers divided by the orifices 31 provided at 0 communicate with each other.

The inner peripheral surfaces of the outer rings 24a, 24b are integrally connected to the tips of the bellows portions 22a, 22b. The inner ring 2 is provided on the inner peripheral side of the elastic member 21.
5 is press-fitted, and the center bearing support thus configured is press-fitted into the cylindrical housing 29.

Next, the operation of the center bearing support shown in the second embodiment will be described. First, when the vibration from the propeller shaft has a low frequency and a large amplitude, the vibration causes the bellows portions 22a and 22b of the elastic member to be largely elastically deformed inward and outward in the radial direction.
3 is elastically deformed radially inward and outward by bringing its outer peripheral surface into contact with the inner peripheral surfaces of the bellows portions 22a and 22b. Due to the deformation of the stopper portion 23, pressure is applied to the liquid chamber 28 inside the stopper portion 23. In operation, the fluid inside the liquid chamber 28 moves through the orifice 31.

As described above, when low-frequency, large-amplitude vibration is input, the elastic deformation of the bellows portions 22a and 22b of the elastic member 21, the elastic deformation of the stopper portion 23, and the viscosity due to the movement of the liquid inside the liquid chamber 28. The resistance can attenuate low frequency, large amplitude vibrations. In this case, the bellows part 2
2a, 22b have a closed annular space inside
The elastic member 21 has an air spring-like damping characteristic.
Element can be added, this frequency range
The vibration can be effectively attenuated.

On the other hand, when the vibration from the propeller shaft has a small amplitude at middle and high frequencies, the bellows 22 of the elastic member 21
This vibration can be attenuated by the elastic deformation of the a and 22b in and out in the radial direction. In this case, no external force is applied until the stopper 23 is displaced, and the bellows 22a of the elastic member 21 is not affected. , 22b alone can sufficiently cope with it, and by setting the spring constant of the elastic member 21 low in advance, it is possible to effectively attenuate vibrations in the mid-high frequency range, and to reduce the occurrence of booming noise and the like. It can be reliably prevented.

Further, since the stopper plate 26 is buried on the outer peripheral side of the stopper portion 23, the effect as a dynamic damper can be exerted. Thereby, vibration of a predetermined frequency can be attenuated. Furthermore, when the bellows part is provided in one place, it is necessary to use an elastic material having a high spring constant,
Although vibration in the mid-high frequency range cannot be attenuated effectively, the provision of the bellows portions 22a and 22b at two places makes it possible to use an elastic material having a low spring constant. In each of the above embodiments, the liquid chamber is
It is formed between the topper part and the inner ring, and the outside of the bellows part is
The outer ring to which the peripheral side is connected is fitted to the inner peripheral side of the housing.
So that the bellows part
Metal fitting can be performed on the inner peripheral side of the jing. But
Therefore, the mating force can be increased,
Can be used. In addition,
In the embodiment, a liquid chamber is formed between the stopper and the inner ring.
The outer circumference of the bellows is connected to the inner circumference of the outer ring.
Makes it easier to release from the mold and increases production efficiency
Things.

[0024]

Advantages of the Invention The present invention has the following effects by being configured as described above. When the vibration in a low frequency, large amplitude is input, the elastic deformation of the bellows portion of the elastic member, the elastic deformation and the liquid chamber of the stopper portion by cooperation of viscous drag fluid moves, vibration inputs
The movement can be damped. In this case,
Since a closed space is formed inside the
Adding an air spring element to the damping characteristics of the elastic member
And effectively reduce the vibration in this frequency range.
It can be attenuated. In addition, when low-frequency, medium-frequency vibration is input , the input vibration is reduced by the elastic deformation of the bellows portion of the elastic member in and out in the radial direction.
Can fade. In this case, the stopper portion is displaced
Since no external force is applied to the bellows,
By previously lowered set the number, vibration of the frequency range
The movement can be effectively attenuated . But
Effectively covers a wide range of vibrations from low to high frequencies
Can be attenuated. The stopper plate is embedded in the stopper.
And the stopper can act as an inertial mass.
Runode, as a dynamic da lymph at a predetermined frequency range
It will be able to demonstrate its function. The liquid chamber is divided into multiple parts by partitions, and adjacent to each partition
The orifice that communicates between the liquid chambers
It can also be entered by viscous drag as liquid passes through the orifice
The vibration to be applied can be attenuated. But
I, effectively a wide range of vibration from low frequency to high frequency
It will be able to attenuate. A liquid chamber is formed between the stopper and the inner ring,
The outer ring that connects the outer peripheral side of the bellows
Because fitted to the peripheral side, the bellows part, through the outer ring Howe
Metal fitting can be performed on the inner peripheral side of the jing. But
Therefore , the mating force can be increased,
Can be used. A liquid chamber is formed between the stopper and the inner ring.
Is connected to the inner circumference of the outer ring .
Can be easily separated. Therefore, the production efficiency increases
Things.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of a center bearing support according to the present invention.

FIG. 2 is a schematic sectional view showing a state before press-fitting into a housing in the first embodiment of the center bearing support according to the present invention.

FIG. 3 is a schematic sectional view showing a second embodiment of the center bearing support according to the present invention.

FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 is a schematic sectional view showing a conventional center bearing support.

[Explanation of symbols]

 1, 21, 51 ... elastic members 2a, 2b, 22a, 22b, 52 ... bellows 3, 23, 53 ... stoppers 4a, 4b, 24a, 24b, 54 ... outer rings 5, 25, 55 ... ... Inner ring 6, 26 ... Stopper plate 7, 27 ... Depression 8, 28 ... Liquid chamber 9, 29 ... Housing 30 ... Partition wall 31 ... Orifice

Claims (4)

(57) [Scope of request for utility model registration] 1. An annular housing and an inner portion of the housing.
An outer ring fitted on the circumferential side and divided into two in the axial direction;
An inner ring provided at a predetermined interval on the inner peripheral side of the outer ring,
An elastic member connecting the outer ring and the inner ring.
The elastic member is provided on the inner peripheral side of each of the two outer rings.
And is connected to the outer circumference of the inner ring and sealed inside.
With two annular bellows forming a closed annular cavity
In the space, a strike is provided on the inner peripheral side of the elastic member.
A stopper portion, and the stopper portion has an outer peripheral side and an inner surface of the cavity.
A predetermined gap is formed between the stopper portion and the inner portion.
A center bearing support characterized by forming an annular liquid chamber filled with liquid between the ring and the ring . 2. The center bearing support according to claim 1, wherein a stopper plate is provided on an outer peripheral side of said stopper portion. 3. The center bearing support according to claim 1, wherein the liquid chamber is provided in an annular shape. 4. The center bearing support according to claim 1, wherein the liquid chamber is divided into a plurality of parts by a partition in a circumferential direction, and the divided liquid chambers are communicated by orifices provided in each partition.