JP2003083325A - Squeeze film damper bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a squeeze film damper bearing capable of preventing a shortage of an oil film. SOLUTION: This squeeze film damper bearing 10 is constituted so that an annular support ring 11 is installed outside an outer race 2A of a rolling bearing 2 externally inserted and arranged on a shaft 1, a thin annular hydraulic fluid space 13 having the shaft directional both ends blocked up by a seal ring 12 is formed between the outer race and this support ring 11, partial annular passages 21 dividedly formed in a plurality in the peripheral direction are formed between the space and an outside support part 3 of the support ring 11, the hydraulic fluid space 13 and the respective partial annular passages 21 are connected via a radial directional supply hole 14, and a hydraulic fluid supplied to a supply annular passage 20 is supplied to the hydraulic fluid space 13 via the supply hole 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supplies a working fluid to a thin annular working fluid space which is continuously formed in the circumferential direction between a bearing member and a supporting member which supports the outer circumference of the bearing member. The present invention relates to a squeeze film damper bearing that suppresses vibration in a direction.

[0002]

2. Description of the Related Art A squeeze film damper bearing used in a rotating portion of a high-speed machine such as an aviation engine has a longitudinal sectional view shown in FIG. 3A and a conceptual transverse sectional view as an example thereof. Further, a bearing member (rolling bearing 2 ') externally fitted to the rotary shaft 1'and a supporting member 3' for supporting the outer circumference thereof.
A support ring 11 'is interposed between the rolling bearing 2'and the support ring 11', and a thin annular working fluid space 13 'continuous in the circumferential direction is closed between the rolling bearing 2'and the support ring 11' by seals 12 '. And the working fluid space 13 'and the annular supply space 20' formed outside the support ring 11 'are provided through a plurality of supply holes 14' circumferentially arranged at a predetermined interval. It is configured to be connected to supply working oil as working fluid from the supply space 20 'to the working fluid space 13' through the supply hole 14 '.
A damping effect is provided by the oil film pressure generated in the working oil (oil film) in the working fluid space 13 'due to the shaft vibration during rotation.

In the supply space 20 ', a supply path 22' is formed at a lower position, and hydraulic oil is supplied from an oil supply pump (not shown) through the supply path 22 '. There is.

[0004]

However, in the squeeze film damper bearing having the conventional structure as described above, when the shaft vibration becomes large, air penetrates the seal into the working fluid space on the anti-eccentric side, which becomes negative pressure, and enters the working fluid space. There is a problem that an oil film breakage occurs, the oil film breakage spreads over the entire circumference, and the damping force disappears.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a squeeze film damper bearing capable of preventing oil film breakage.

[0006]

A squeeze film damper bearing of the present invention which achieves the above object is a thin annular working fluid formed continuously in the circumferential direction between a bearing member and a support member supporting the outer periphery thereof. Working fluid is supplied to the space,
In a squeeze film damper bearing that suppresses radial vibration of the bearing member, a plurality of supply spaces that are divided in the circumferential direction are formed on the outer peripheral side of the working fluid space, and the respective supply spaces and the working fluid space are It is characterized in that it is configured to include a supply path that is connected via a supply hole and that supplies a working fluid to each of the supply spaces independently.

Further, a plurality of the supply holes are formed in the axial direction.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a vertical sectional view of a squeeze film damper bearing according to the present invention, and FIG. 2 is a conceptual horizontal sectional view.

The illustrated squeeze film damper bearing 10
Is equipped with an annular support ring 11 on the outer side of an outer ring 2A of a rolling bearing 2 as a bearing member externally installed on the shaft 1 and sealed with seal rings 12 at both axial ends between the support ring 11 and the support ring 11. A thin annular working fluid space 13 is formed as a working fluid space, and a supply ring passage 20 formed between the working fluid space 13 and the support portion 3 outside the support ring 11 is arranged in a radial direction. It is configured to be connected via the supply hole 14, and the working oil supplied to the supply circuit 20 is supplied to the working fluid space 13 via the supply hole 14.

Here, as shown in FIG. 2, the supply passage 20 is not connected to the entire circumference in the circumferential direction, but is divided into a plurality (six in the figure) of partial circulation passages 21 as a supply space. Each of the divided partial circulation paths 21 and the hydraulic oil space 13 are connected by a plurality of supply holes 14.

In the illustrated structural example, the connection holes 14 are formed at two positions at predetermined intervals in the circumferential direction, and at three positions in the axial direction, respectively, for a total of six connection holes 14, in total. That is, the partial circulation passage 21 and the hydraulic fluid space 13 are 36 in total.
They are connected by book connecting holes 14.

A supply passage 22 is connected to each of the partial circulation passages 21, and hydraulic oil whose pressure is adjusted is supplied from an oil supply pump (not shown) through the supply passage 22. There is.

In the squeeze film damper bearing 10 constructed as described above, hydraulic oil of a predetermined pressure is supplied to each partial circulation passage 21 through the supply passage 22, and the hydraulic oil is supplied from each partial circulation passage 21 to the supply hole 14. And flows into the hydraulic oil space 13 to generate a damping effect.

With such a configuration, the hydraulic oil is supplied to the hydraulic oil space 13 independently from the partial circulation passages 21 divided in the circumferential direction, so that the interval is widened by the vibration of the shaft 1 when the shaft 1 rotates. The hydraulic oil is rapidly supplied to the portion where the negative pressure is generated, so that it is possible to prevent the damping force from being lost due to the oil film shortage, and to quickly recover even if the oil film shortage occurs.

Further, since a plurality of supply holes 14 connecting the partial circulation passage 21 and the hydraulic oil space 13 are provided in the axial direction,
Since the supply of hydraulic oil in the axial direction is performed quickly and smoothly,
The hydraulic oil can be supplied according to the change in the hydraulic pressure in the axial direction, and the oil film in the axial direction can be prevented from running out.

Further, the supply pressure of the hydraulic oil to each of the partial circulation paths can be adjusted and changed in accordance with the pressure change of the hydraulic oil space (the pressure is increased when the pressure of the corresponding hydraulic oil space becomes a negative pressure). With this configuration, it is possible to further prevent the oil film from running out.

Incidentally, the division of the partial circulation path and the number and arrangement of the supply holes are not limited to the above-mentioned constitutional example, but can be appropriately changed.

[0019]

As described above, according to the squeeze film damper bearing of the present invention, a plurality of circumferentially divided supply spaces are formed on the outer peripheral side of the working fluid space.
The supply space and the working fluid space are connected to each other through the supply holes, and each supply space is provided with a supply path for independently supplying the working fluid. Since the working fluid is supplied independently from the supply space divided in the circumferential direction, the working fluid can be quickly supplied to the part where the gap is widened due to the shaft vibration during the rotation of the shaft and the pressure becomes negative. It is possible to prevent the damping force from being lost due to the oil film shortage, and to recover quickly even if the oil film shortage occurs.

Further, since the plurality of supply holes are formed in the axial direction, the supply of the working fluid in the axial direction is performed quickly and smoothly, and the working oil is supplied in accordance with the change in the hydraulic pressure in the axial direction. It is possible to prevent the oil film from running out in the axial direction.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a squeeze film damper bearing according to the present invention.

FIG. 2 is a conceptual cross-sectional view thereof.

3A and 3B show a squeeze film damper bearing as a conventional example, in which FIG. 3A is a vertical sectional view and FIG. 3B is a conceptual horizontal sectional view.

[Explanation of symbols]

1 axis 2 Rolling bearing (bearing member) 10 Squeeze film damper bearing 13 Working oil space (working fluid space) 14 Supply hole 20 Supply circuit 21 Partial circuit (supply space) 22 Supply route

Claims (2)

[Claims] 1. A working fluid is supplied to a thin annular working fluid space formed continuously in the circumferential direction between a bearing member and a support member supporting the outer periphery of the bearing member to suppress radial vibration of the bearing member. In the squeeze film damper bearing, a supply space divided into a plurality in the circumferential direction is formed on the outer peripheral side of the working fluid space, and each supply space and the working fluid space are connected via a supply hole, A squeeze film damper bearing, characterized in that it is provided with a supply path for supplying a working fluid to each of the supply spaces independently. 2. The squeeze film damper bearing according to claim 1, wherein a plurality of the supply holes are formed in the axial direction.