JPS6324301Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a bearing device, and in particular provides a simple structure to reliably prevent lubricating oil leakage caused by a joint located near a bearing. The present invention relates to a bearing device.

[Technical background of the invention and its problems]

As a bearing device, a bearing part 1 is used as shown in FIG.
It is known to have a joint part 3 on the rotating shaft 2 near the rotary shaft 2. In the figure, 4 is a load device such as a compressor, and both ends of a rotating shaft 2 extending from both ends of the load device 4 are rotatably supported by oil-lubricated bearings 1. There is. The bearing part 1 is the second
As shown in the figure, it has a labyrinth packing 5 for preventing lubricating oil leakage. Further, a rotational drive means is connected to one end of the rotating shaft 2 extending from the bearing portion 1 via a flange joint serving as a joint portion 3 .

However, in the above-mentioned bearing device, the gap 6 between the bearing part 1 and the joint part 3 becomes negative pressure due to the air agitation effect caused by the rotation of the joint part 3 having unevenness such as the bolt 7. There was a problem that lubricating oil leaked from the bearing part 1. For this reason, conventionally, a windbreak plate 8 was provided outside the labyrinth packing 5 as shown in FIG. 2 to prevent the influence of turbulence.
Since the entire cavity 6 becomes a turbulent negative pressure region 9, the effect of preventing oil leakage by the windbreak plate 8 could not be expected to be that great.

[Purpose of invention]

Therefore, the present invention was devised to eliminate the above-mentioned drawbacks of the conventional technology, and its purpose is to easily create a bearing device that can reliably prevent lubricant oil leakage from the bearing caused by the rotation of the joint. The goal is to provide a unique structure.

[Summary of the idea]

In order to achieve the above object, the present invention provides a bearing device having a joint part that forms a turbulent negative pressure area on the rotating shaft near the bearing part, and provides a partition between the bearing part and the joint part. The present invention is characterized in that a partition plate is provided to partition the turbulent negative pressure region, and an air introduction portion for introducing air from the bearing portion to the turbulent negative pressure region is formed on the partition plate.

[Embodiment of the invention] A preferred embodiment of the invention will be described below in detail with reference to the accompanying drawings.

In FIG. 3 showing the first embodiment of the present invention, 1
is a bearing part, 2 is a rotating shaft rotatably supported by the bearing part 1, and the bearing part 1 has a labyrinth packing 5 for sealing between it and the rotating shaft 2, and the influence of turbulence on the outside thereof. A windbreak plate 8 is provided to prevent this. Note that the windbreak plate 8 does not necessarily need to be provided.

A flange joint portion 3 close to the bearing portion 1 is provided at the end of the rotating shaft 2 . This joint part 3 has an annular groove 1 open to the bearing part side at the peripheral edge of the flange.
0, and bolts 7 are arranged within this groove 10 at appropriate intervals.

A partition plate 11 is provided between the bearing part 1 and the joint part 3 to partition them and to define a turbulent negative pressure region 9 formed between them.
This partition plate 11 is formed with an air introduction section 12 for introducing air into the turbulent negative pressure region 9 from the bearing section side. Specifically, the partition plate 11 is connected to the rotating shaft 2.
Consisting of an annular flat plate surrounding the outer peripheral edge 11
A is formed to extend outward from the turbulent negative pressure region 9 and is bent to form an air introduction section 12 at an angle toward the joint section 3 . Further, the partition plate 11 is attached to the bearing part 1 via a bracket 13 so as to be located approximately in the middle between the bearing part 1 and the joint part 3. Note that there is a minute gap 14 between the inner peripheral edge of the partition plate 11 and the rotating shaft 2 to allow rotation of the rotating shaft 2.
is provided.

Next, the operation of the above embodiment will be described.

When the rotating shaft 2 rotates, the partition plate 11 and the joint part 3
A negative pressure is generated in the turbulent negative pressure region 9 defined by the partition plate 11 and the rotating shaft 2, and attempts to draw air from the partition plate 11 toward the bearing section through the gap 14 between the partition plate 11 and the rotating shaft 2. However, the outer peripheral edge 11a of the partition plate 11 has an air introduction part 12 which is bent toward the joint part to enlarge the opening area between the partition plate 11 and the bearing part 1.
is formed, so that air from the air introduction section 12 is smoothly introduced into the turbulent negative pressure region 9. Therefore, since no negative pressure is generated in the gap 15 between the bearing part 1 and the partition plate 11, the lubricating oil in the bearing part does not leak from the labyrinth packing 5.

FIG. 4 shows a second embodiment of the invention.

As shown in the figure, a partition plate 11 consisting of an annular flat plate is attached to the bearing portion 1 side via a bracket 13 at a substantially intermediate portion between the bearing portion 1 and the joint portion 3 on the rotating shaft 2. In this embodiment, air inlet holes 16 are formed at appropriate intervals in the circumferential direction on the partition plate 11 as air inlet portions 12. Therefore, air enters the turbulent negative pressure region 9 through the air inlet holes 16 without passing through the gap 14 between the partition plate 11 and the rotating shaft 2.
Since air is supplied directly to the turbulent negative pressure area 9 from
The gap 15 between the bearing portion 1 and the partition plate 11 does not become negative pressure.

In order to reduce the turbulent negative pressure phenomenon in the turbulent negative pressure region 9, an elastic cap 17 may be fitted to cover the annular groove 10 of the flange as shown in FIGS. 5 and 6. good. In this case, the side wall 10a of the annular groove 10 may be formed to be inclined so that the inlet side is located radially inward so that the cap 17 will not come off due to centrifugal force.

[Effect of idea]

In summary, the present invention exhibits the following excellent effects.

(1) The turbulent negative pressure area is separated from the bearing side by a partition plate, and air is actively introduced into the turbulent negative pressure area from the air introduction part, so the bearing side is free from turbulent negative pressure. Therefore, leakage of lubricating oil from the bearing portion can be reliably prevented.

(2) Since it has a simple structure that only requires a partition plate, it can be easily manufactured at low cost and can be easily adopted in existing bearing devices.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the general structure of a bearing device;
Fig. 2 is an enlarged sectional view of section A in Fig. 1, Fig. 3 is a partial sectional view showing the first embodiment of the invention, Fig. 4 is a partial sectional view showing the second embodiment of the invention, and Fig. 5. 6 is a perspective view of the joint portion, and FIG. 6 is a sectional view thereof. In the figure, 1 is a bearing part, 2 is a rotating shaft, 3 is a joint part,
9 is a turbulent negative pressure region, 11 is a partition plate, and 12 is an air introduction section.

Claims (1)

[Scope of utility model registration request] In a bearing device having a joint part that forms a turbulent negative pressure area on a rotating shaft near the bearing part, a partition plate that partitions the bearing part and the joint part and partitions the turbulent negative pressure area. 1. A bearing device characterized in that the partition plate is provided with an air introduction portion for introducing air from the bearing portion side into the turbulent negative pressure region.