JP2577909Y2 - 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 effectively used as a vibration-proof support for a propeller shaft of an automobile or the like.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, a center bearing support for vibration-proofing a propeller shaft of an automobile or the like is already known.

That is, this center bearing support has a cylindrical outer ring 22 located at a predetermined interval outside a cylindrical inner ring 21, and the outer ring 2.
A rubber-like elastic body 23 is vulcanized between the inner ring 2 and the inner ring 21 so that the cross-section becomes substantially U-shaped, and the two are integrally connected.

By mounting the inner ring 21 side of the center bearing support constructed as described above on a propeller shaft (not shown) via a bearing 30 and the outer ring 22 side on a vehicle body (not shown), the propeller shaft is mounted. It is designed to support vibration isolation.

In general, a propeller shaft generates a wide range of vibrations from a low frequency (for example, whirling vibration at the time of starting) to a high frequency (for example, muffled sound).
To be able to cope with all these vibrations,
There is a need for a center bearing support capable of setting a high spring in a low frequency range and a low spring in a high frequency range.

However, in the conventional center bearing support, since the shape of the rubber-like elastic body 23 has no degree of freedom, only one kind of spring constant can be set. By setting, the damping property against vibration in a high frequency range is mainly improved.

Therefore, damping of vibration in a low frequency range becomes a problem. In this case, an annular stopper portion 24 is formed integrally with the rubber-like elastic body 23 and the stopper portion 2 is formed.
4, it is possible to cope with whirling vibration in a low frequency region. However, the vibration in the low frequency region cannot be sufficiently attenuated by the stopper portion 24 alone, and the rubber-like elastic body 2
There was a problem that the displacement amount of No. 3 became large and the durability was remarkably reduced.

In order to solve the above-mentioned problem, as shown in FIG. 5, a cylindrical outer ring 32 is positioned outside a cylindrical inner ring 31 at a predetermined interval. The two members are integrally connected by a rubber-like elastic body 33 by vulcanization bonding or the like, and an annular stopper member 34 made of a metal or the like formed separately is attached to the rubber-like elastic body 33, and a spring in a low frequency range is mounted. Some of them are configured to increase the constant, but even in such a case, it was not possible to completely attenuate the vibration in the low frequency range.

The present invention solves the above-mentioned problems of the prior art. By making it possible to set a high spring in a low-frequency range and a low spring in a high-frequency range, the low-frequency range can be set. It is an object of the present invention to provide a center bearing support capable of exhibiting excellent damping properties over a wide range of vibrations from high to high frequencies.

[0010]

In order to solve the above-mentioned problems, the present invention relates to a method in which an outer ring is integrally connected to an outer peripheral side of an inner ring via a rubber-like elastic body, and the inner ring is connected to a bearing. A plurality of liquid chambers filled with liquid are formed in the rubber-like elastic body in the circumferential direction in a center bearing support in which the outer ring is mounted on the fixed body side on the rotating shaft side via the shaft. die together, in communication with each other between adjacent liquid chambers with an orifice, and the outer peripheral side of the liquid chamber to
Close the diaphragm with the inner surface of the diaphragm inside the liquid chamber.
Contact the liquid, and contact the outer surface of the diaphragm with the atmosphere.
This means employs a means configured to cause the above .

[0011]

According to the present invention, by adopting the above-mentioned means, the displacement of the rubber-like elastic body and the liquid filled in each liquid chamber in the rubber-like elastic body cause the orifice to vibrate in a low frequency range. Due to the flow resistance when moving, the whole can be made to have a high spring, and the vibration in the high frequency range is caused by the resonance with the liquid sealed in each liquid chamber and the fine vibration of the diaphragm following it As a result, the whole can be made to have a low spring, and therefore, excellent damping properties can be exhibited for a wide range of vibrations from low frequency to high frequency.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. 1 to 3 show an embodiment of a center bearing support according to the present invention. FIG. 1 is a schematic cross-sectional view showing the whole, viewed along line AA in FIG. FIG. 2 is a right side view showing the whole, and FIG. 3 is a left side view showing the whole.

That is, the center bearing support includes a cylindrical inner ring 1, a cylindrical outer ring 2 located at a predetermined interval on the outer peripheral side of the inner ring 1, and the inner ring 1. An annular rubber-like elastic body 3 provided between the outer ring 2 and integrally connected to the outer ring 2 by vulcanization bonding or the like; and rotating the inner ring 1 via a bearing 11 such as a propeller shaft (not shown). The outer ring 2 is mounted on a fixed body such as a vehicle body (not shown) on the shaft side.

A plurality of cavities 4 penetrating in the axial direction are formed in the rubber-like elastic body 3 at predetermined intervals in the circumferential direction, and a space between adjacent cavities 4 is formed. Is formed with a concave portion 5 whose outer peripheral side is open, and the opening of the concave portion 5 is closed by a thin plate-shaped diaphragm 6, and a liquid chamber 7 in which a liquid 8 is sealed is formed inside. The adjacent liquid chambers 7, 7 communicate with each other via an orifice 9 provided on the outer peripheral surface of the rubber-like elastic body 3, and the inner peripheral surface of the diaphragm 6 is sealed in the liquid chamber 7. The outer peripheral surface side comes into contact with the atmosphere through an air hole 10 formed in the outer ring 2.

The inner ring 1 side of the center bearing support constructed as described above is mounted on a propeller shaft, which is a rotating body (not shown), through a bearing 11 inside the center bearing support, and the outer ring 2 side is not fixed. When mounted on the vehicle body side and a low-frequency large amplitude (whirl vibration at the time of starting, etc.) is input from the propeller shaft side, the vibration causes the rubber-like elastic body 3 to largely elastically deform radially in and out. The liquids 8 in the liquid chamber 7 move with each other through the orifices 9.

That is, the vibration of the liquid 7 when the liquid 7 moves through the orifice 9 due to the displacement of the rubber-like elastic body 3 cannot cope with the vibration of the low-frequency large-amplitude only by the displacement of the rubber-like elastic body 3. By adding the resistance, the vibration in the low frequency range is attenuated with the whole being in a high spring state. Reference numeral 12 denotes a dustproof cover for the bearing 11.

On the other hand, when high-frequency, small-amplitude vibrations (muffled sound, etc.) are input from the propeller shaft side, the vibrations cause the liquids 8 sealed in the respective liquid chambers 7 to resonate. When the diaphragm 6 closing the outer peripheral side vibrates slightly, the vibration in a high frequency range is attenuated in a state where the whole is in a low spring state.

As described above, in the center bearing support according to the present embodiment, the displacement of the rubber-like elastic body 3 and the movement of the liquid 8 in each liquid chamber 7 through the orifice 9 in the low frequency range. Due to the flow resistance, the whole can be made to have a high spring, and in the high frequency region, the whole can be made to have a low spring by resonance with the liquid 8 in each liquid chamber 7 and fine vibration of the diaphragm 6 following the resonance. Therefore, excellent damping properties can be exhibited for vibrations in a wide range from low frequency to high frequency.

[0019]

According to the present invention, the elastic deformation of the rubber-like elastic body in the low frequency range is achieved by the above-described structure.
Due to the flow resistance when the liquid in each liquid chamber moves through the orifice, a high damping force can be obtained because the whole can be made to have a high spring, and in the high frequency range, each liquid chamber can be filled. The resonated liquid resonates, and the diaphragm that closes the outer peripheral side of the liquid chamber is deformed in response to the micro-vibration following the resonance, so that the whole can be made to have a low spring, so that a large damping force is obtained. Therefore, the present invention has an excellent effect that vibration in a wide range from low frequency to high frequency can be reliably attenuated.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of a center bearing support according to the present invention, and is a cross-sectional view taken along line AA of FIG.

FIG. 2 is a right side view of the one shown in FIG.

FIG. 3 is a left side view of the one shown in FIG. 1;

FIG. 4 is a schematic sectional view showing an example of a conventional center bearing support.

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

[Explanation of symbols]

 1, 21, 31 ... inner ring 2, 22, 32 ... outer ring 3, 23, 33 ... rubber-like elastic body 4 ... void 5 ... liquid chamber 6 ... diaphragm 7 ... liquid 8 ... Orifice 9 Air hole 10, 30, 40 Bearing 11 Cover 24 Stopper part 34 Stopper member

Claims (1)

(57) [Scope of request for utility model registration] 1. An outer ring (2) is integrally connected to an outer peripheral side of an inner ring (1) via a rubber-like elastic body (3), and the inner ring (1) is rotated via a bearing (11). A liquid chamber (7) in which a liquid (8) is sealed in the rubber-like elastic body (3) in a center bearing support in which the outer ring (2) is mounted on the fixed body side on the shaft side. ) with a plurality of formed toward the circumferential direction, the adjacent liquid chambers between (7) (7) in communication with each other by an orifice (9), or
First, the outer peripheral side of the liquid chamber (7) is closed with a diaphragm (6).
Block the inner surface of the diaphragm (6) in the liquid chamber (7).
Contact the liquid and expose the outside of the diaphragm (6) to the atmosphere
A center bearing support that is configured to contact .