JPH0694034A - Bearing device - Google Patents

Abstract

PURPOSE:To realize high reliability with a dry friction condition and a boundary lubrication condition, due to the oil film pressure shortage in a bearing part, prevented in rotation-starting a rotation shaft in a bearing device used for various kinds of rotational equipment. CONSTITUTION:A movement member 7, movable to a first space 6 located in the radial direction of a rotation member 1, is provided in the inside of the rotation member 1, and also an elastic member 9 is provided between the rotation member 1 and the movement member 7. The pressure of the fluid 5 in a tiny gap 3 is increased to evade a dry friction condition or a boundary lubrication condition in which the rotation member 1 and a housing 2 are directly contacted in rotation-starting the rotation member 1 by communicating between the first space 6 and the tiny gap 3 by a first passage 8, obtaining a bearing device having high reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device to which a fluid is applied.

[0002]

2. Description of the Related Art In recent years, fluid bearings have been widely used mainly for rotating equipment.

A conventional bearing device will be described below.
FIG. 8 shows a sectional view of a conventional bearing device. Figure 8
In the above, 1 is a rotating member. 2 is a housing, 3 is a minute gap, 4 is a second passage, and 5 is a fluid.

The operation of the bearing device constructed as above will be described below. First, the fluid 5 is supplied to the minute gap 3 through the second passage 4. Rotating member 1
When is rotated, a dynamic pressure is generated by the fluid 5 in the minute gap 3 and a gap is maintained between the housing 2 and the rotating member 1.

[0005]

However, in the above-mentioned conventional structure, when the rotary member 1 is started to rotate, the dynamic pressure of the fluid 5 in the minute gap 3 is almost zero, and the rotary member 1 or the housing is not generated. In some cases, the load applied to the rotor 2 may be overcome and a gap may not be maintained between the rotating member 1 and the housing 2, resulting in dry friction or boundary lubrication in which the rotating member 1 and the housing 2 are in direct contact with each other. Also, there is a problem that the life of the housing 2 is significantly reduced.

The present invention solves the above-mentioned conventional problems, and provides a bearing device capable of increasing the pressure of fluid existing in a minute gap during rotation start of the rotating member to maintain the gap between the rotating member and the housing. The purpose is to do.

[0007]

In order to achieve this object, a bearing device of the present invention is provided in a rotating member, a housing, a minute gap between the rotating member and the housing, and inside the rotating member. A first space; a moving member housed in the first space and movable in the radial direction of the rotating member; a second space existing when the moving member moves in the radial direction of the rotating member; and a first space And a first passage communicating with the minute gap,
An elastic member is provided between the rotating member and the moving member inside the first space, and the second passage provided in both the rotating member and the housing or both the rotating member and the housing for supplying fluid to the minute gap. It has the configuration of.

[0008]

With this structure, when the rotary member is started to rotate, the moving member housed inside the rotary member moves in the radial direction of the rotary member by the centrifugal force. At this time, the volume of the first space communicating with the minute gap decreases and the pressure of the fluid contained therein rises, so that the pressure of the fluid inside the minute gap also rises. Therefore, the pressure of the fluid inside the minute gap opposes the load applied to the rotating member or the housing, and the gap between the rotating member and the housing can be maintained.

[0009]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

1 to 4 are sectional views of a bearing device showing a first embodiment of the present invention, 6 is a first space, 7 is a moving member, 8 is a first passage, and 9 is an elastic member. , 11 is the second space.

The operation of the bearing device configured as described above will be described with reference to FIGS. First, when the rotating member 1 starts to rotate, the moving member 7 provided inside the rotating member 1 moves inside the first space 6 in the radial direction of the rotating member 1 due to a centrifugal force. At this time, the volume of the first space 6 decreases and the pressure of the fluid 5 contained therein increases. Therefore, the pressure of the fluid 5 inside the minute gap 3 communicating with the first space 6 and the first passage 8 also increases. Therefore, since the pressure of the fluid 5 in the minute gap 3 opposes the load applied to the rotating member 1 or the housing 2, a gap can be maintained between the rotating member 1 and the housing 2.

As described above, according to this embodiment, the first space 6 is provided inside the rotating member 1, and the moving member 7 which is movable in the radial direction of the rotating member 1 is provided inside the first space 6 so as to rotate with the moving member 7. By providing the elastic member 9 between the rotary member 1 and the member 1, the pressure of the fluid 5 inside the minute gap 3 is increased when the rotary member 1 starts to rotate, and a direct gap is maintained between the rotary member 1 and the housing 2. Due to this, dry friction and boundary lubrication can be prevented.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. 5 to 7 are sectional views of a bearing device showing a second embodiment of the present invention. 5 to 7, 10 is a seal member. 1 to 4 is different in that the moving member 7 or the rotating member 1 or both the moving member 7 and the rotating member 1 are provided with a seal member 10 on the contact surface between the moving member 7 and the rotating member 1. .

The operation of the bearing device constructed as above will be described below. First, when the rotating member 1 is started to rotate, the moving member 7 moves in the radial direction of the rotating member 1. At this time, the sealing member 10 prevents the fluid 5 in the first space 6 whose volume has decreased and pressure has risen from leaking to the second space 11 at this time.

As described above, by providing the seal member 10 on the rotating member 1 and / or the moving member 7 at the contact surface between the rotating member 1 and the moving member 7, the moving member is activated when the rotating member 1 is started to rotate. It is possible to prevent the fluid 5 from leaking between the first space 6 and the second space 11 separated by 7.

In the first embodiment, the first space 6
The moving member 7 and the first passage 8 are provided at four locations in the radial direction of the rotating member 1, but may be provided at three locations or less or at five locations or more.

[0017]

As described above, according to the present invention, the rotating member, the housing, the minute gap between the rotating member and the housing, the first space provided inside the rotating member, and the first space. A movable member housed in the movable member that is movable in the radial direction of the rotating member, a second space that exists when the moving member moves in the radial direction of the rotating member, and a first space that communicates the first space with the minute gap. An elastic member is provided between the rotating member and the housing, or a second passage provided in both the rotating member or the housing or the rotating member / housing for supplying fluid to the minute gap, and the rotating member and the moving member inside the first space. It is possible to realize an excellent bearing device with high reliability by increasing the oil film pressure due to the fluid at the time of rotation start of the rotating member and preventing the dry friction state or boundary lubrication state due to the direct contact between the rotating member and the housing. It is intended.

[Brief description of drawings]

FIG. 1 is a sectional view of a bearing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the bearing device according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a bearing device according to a first embodiment of the present invention.

FIG. 4 is a sectional view of the bearing device according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a bearing device according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a bearing device according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a bearing device according to a second embodiment of the present invention.

FIG. 8 is a sectional view of a conventional bearing device.

[Explanation of symbols]

 1 Rotating Member 6 First Space 7 Moving Member 9 Elastic Member 10 Sealing Member 11 Second Space

Claims (2)

[Claims] 1. A rotating member, a housing, a minute gap between the rotating member and the housing, a first space provided inside the rotating member, and a first space housed in the first space. A moving member that is movable in the radial direction of the rotating member, a second space that exists when the moving member moves in the radial direction of the rotating member, and a first space that communicates the first space and the minute gap. Of the rotary member, the housing, or both the rotary member and the housing for supplying fluid to the minute gap, and the inside of the rotary member and the first space. A bearing device comprising an elastic member between the moving member and the moving member. 2. The bearing device according to claim 1, wherein a seal member is provided on the moving member, the rotating member, or both the moving member and the rotating member at a contact surface between the moving member and the rotating member. .