JPH0739696Y2 - Center bearing support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a center bearing support, and more particularly to a center bearing support suitable for supporting a rotating shaft by utilizing the pressure of fluid.

[Conventional technology]

In vehicles such as automobiles, a center bearing support is used as a bearing support for rotatably supporting a propeller shaft.

This type of conventional center bearing support supports a propeller shaft support bearing with an inner ring, and an elastic body such as rubber is inserted around the inner ring and fixed to the vehicle body to rotatably support the propeller shaft. At the same time, the elastic body absorbs the vibration of the propeller shaft.

[Problems to be solved by the device]

However, the conventional center bearing support is
In order to suppress muffled sound at high speed, the spring constant of the elastic body is set low, so when the component of the vibration sound generated from the propeller shaft is in the low frequency region, this vibration component can be attenuated sufficiently. However, there was a problem that an abnormal noise was generated when the vehicle suddenly started.

An object of the present invention is to provide a bearing support that can obtain a sufficient damping characteristic for vibration in a low frequency range.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is a center bearing support for rotatably supporting a propeller shaft on the vehicle body side, and an annular bearing mounted on the peripheral surface of the propeller shaft and an outer peripheral side of the bearing. An annular outer ring that is located at a predetermined interval and that is connected to the vehicle body side via a bracket, and is mounted between the bearing and the outer ring and is a space that is hermetically sealed inside. And a rubber tube that forms a rubber tube that is attached to the peripheral surface of the rubber tube at predetermined intervals in the circumferential direction, and narrows the peripheral surface of the rubber tube to partition the interior of the cavity into a plurality of fluid chambers and adjoins each other. And a diaphragm ring that forms an orifice having a smaller diameter than the fluid chambers that communicate between the fluid chambers.

[Action]

According to the present invention, by adopting the above-mentioned means, when vibration including a vibration component in a low frequency region is generated from the rotary shaft due to the vibration of the rotary shaft, the fluid in each fluid chamber is transferred to another via the orifice according to the vibration. It moves to the side of the fluid chamber, and a characteristic of high damping is obtained with respect to vibration in the low frequency region.

Further, when the rotary shaft rapidly rotates, the fluid enclosed in the elastic body functions as a fluid spring, so that abnormal noise is prevented from being generated when the rotary shaft rapidly rotates.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a center bearing support according to the present invention, which is a propeller shaft as a rotating shaft.
A ring-shaped inner ring 6, a ring-shaped outer ring 12 located at a predetermined distance on the outer peripheral side of the inner ring 6, and a ring-shaped inner ring 6 are mounted between the inner ring 6 and the outer ring 12. A bearing 5 composed of a plurality of rolling elements such as a rope 11 is mounted, and the propeller shaft 10 is rotatably supported by the bearing 5.

A ring-shaped outer ring 13 that forms a constant space with the outer ring 12 is arranged around the inner ring 12, and one end of the outer ring 13 is fixed to the vehicle body via a bracket 14. .

Then, a substantially annular rubber tube 15 is inserted in the space formed between the outer ring 12 and the outer ring 13.

This rubber tube 15 has multiple fluid chambers 16A, 16B, 16C, 16
D, 16E, and a throttle ring 17 is inserted between the fluid chambers. The throttle ring 17 allows the fluid chambers 16A, 16B, 16
An orifice having a diameter smaller than that of each fluid chamber 16A, 16B, 16C, 16D, 16E is formed between C, 16D, 16E.

That is, as shown in FIG. 2, the rubber tube 15 is divided into a plurality of fluid chambers 16A to 16E by inserting a throttle ring 17 at an arbitrary position as shown by an arrow, and each of the fluid chambers 16A to 1E.
The 6Es are connected in a chain shape via an orifice to form a substantially annular elastic body.

Then, air is injected into the rubber tube 15 through the suction ports 18 or 19 provided in the fluid chambers 16A and 16E, and the suction port 1
8 and 19 are sealed by stoppers 20 and 21, respectively.

As a result, air is enclosed in the rubber tube 15 and the outer ring
12 is connected to the outer ring 13 via a rubber tube 15.

In the above structure, the propeller shaft 10 is rotatably supported by the bearing 5, and the driving force of the engine is smoothly transmitted to the axle via the propeller shaft 10.

Further, the vibration of the propeller shaft 10 is absorbed by the tube 15, and the vibration of the propeller shaft 10 is suppressed from being transmitted to the vehicle body.

Further, when the propeller shaft 10 vibrates at a frequency in a low frequency region, the air in each of the fluid chambers 16A to 16E moves to the adjacent fluid chamber side via the orifice according to the vibration, so that the rubber tube 15 moves to the low frequency region. It exhibits a high damping characteristic with respect to the vibration in the region, and can sufficiently absorb the vibration component in the low frequency region.

Further, when the vehicle suddenly starts and the propeller shaft 10 suddenly rotates, the air in each of the fluid chambers 16A to 16E functions as an air spring, so that it is possible to prevent abnormal noise (tapping sound) from being generated at the time of sudden start. You can

In the above-mentioned embodiment, if the hardness of the rubber tube 15 is lowered, it is possible to have a function as a low dynamic spring.

In addition, when the diaphragm ring 17 is inserted into the rubber tube 15, the diaphragm ring 17 can be easily inserted and formed by forming a portion into which the diaphragm ring 17 is inserted thinner than other portions. The orifice can be easily formed.

Further, in the above-described embodiment, it is possible to fill the tube 15 with a liquid instead of air.

[Effect of device]

The present invention relates to a center bearing support that rotatably supports a propeller shaft on the vehicle body side, and an annular bearing mounted on the circumferential surface of the propeller shaft and a predetermined distance on the outer peripheral side of the bearing. In addition, an annular outer ring that is connected to the vehicle body side via a bracket, a rubber tube that is mounted between the bearing and the outer ring, and that forms a sealed void inside, The rubber tube is attached to the circumferential surface at predetermined intervals in the circumferential direction, the circumferential surface of the rubber tube is narrowed to partition the inside of the void into a plurality of fluid chambers, and the adjacent fluid chambers communicate with each other. When the propeller shaft vibrates in the low frequency range, it has a structure that includes a throttle ring that forms an orifice with a diameter smaller than that of the fluid chamber. Between the ring and the ring, there is relative displacement inside and outside in the radial direction through the rubber tube, and at this time the internal pressure of each fluid chamber of the rubber tube changes, so that fluid moves between adjacent fluid chambers through the orifices. However, by utilizing the flow resistance at this time, it is possible to damp vibrations in this frequency range. Further, since the orifice has a predetermined diameter set by the diaphragm ring attached to the peripheral surface of the rubber tube, even if pressure is applied by the input vibration, it is not possible to expand the diameter beyond the diameter of the diaphragm ring. Since the diameter does not change, a constant orifice effect (damping effect) can be obtained. Furthermore, the vibration generated when the propeller shaft rapidly rotates is absorbed by the rubber tube acting as an air spring. Therefore, it is possible to satisfy both the high attenuation in the low frequency range and the prevention of the abnormal noise at the time of sudden start.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a view for explaining a method of inserting a diaphragm ring into a rubber tube. 5 …… Bearing, 6 …… Inner ring, 10 …… Propeller shaft 11 …… Race ball 12 …… Outer ring 13 …… Outer ring 14 …… Bracket 15 …… Rubber tube 16A, 16B, 16C, 16D, 16E… … Fluid chamber 17… Ring for throttling

Claims (1)

[Scope of utility model registration request] 1. A center bearing support for rotatably supporting a propeller shaft (10) on the vehicle body side, which comprises an annular bearing (5) mounted on the peripheral surface of the propeller shaft (10), and the bearing ( 5) An annular outer ring (13), which is located on the outer peripheral side at a predetermined interval and is connected to the vehicle body side via a bracket (14), and the bearing (5).
A rubber tube (15) that is mounted between the outer ring (13) and the outer ring (13) and forms a sealed space inside, and a predetermined direction in the circumferential direction on the peripheral surface of the rubber tube (15). It is installed at intervals, and the inner surface of the rubber tube (15) is narrowed down to create a plurality of fluid chambers (16A, 16B, 16C, 16D, 16
E) and adjacent fluid chambers (16A, 16B)
(16B, 16C) (16C, 16D) (16D, 16E) A throttle ring (17, 17 ...) that forms an orifice with a smaller diameter than the fluid chambers (16A, 16B, 16C, 16D, 16E) that communicate with each other. ...) Center bearing support characterized by including and.