JPS6318831Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bearing device for a horizontal rotating machine equipped with a thrust bearing, and in particular a bearing device with an improved oil supply path to effectively supply oil to the thrust bearing on the side that supports thrust force. Regarding.

In recent years, for example, as paper machines and the like have become larger, their drive motors have also become larger in capacity, and the amount of thrust resistance required from paper machines and the like on the motor rotor side is also increasing. This is true not only for electric motors but also for other horizontal rotating machines that are becoming larger in size.Therefore, there has been a strong demand for bearing devices that can withstand high speed rotation and high thrust loads. is the current situation.

For this reason, a bearing device to which a thrust force is applied alternately from both directions, for example, as shown in FIGS. 1 and 2, has thrust bearings 2a and 2b installed at both axial ends of a journal bearing 1, and these thrust bearings are connected to each other. Surrounding annular chambers 3a and 3b are respectively formed, and the oil supply circuit includes an oil supply passage 4 for supplying oil to the pressure receiving surface of the journal bearing 1, and a separate oil supply passage 4 for the thrust bearing into the chambers 3a and 3b. A mutually independent oil supply path 5a-oil supply hole 6a and 5b-6b for supplying oil are provided. (Utility Model Publication No. 55-1295) However, according to the above-described oil supply circuit configuration, the thrust bearing on the side to which no thrust force is applied is also supplied with oil, which wastes power and reduces the cost of the oil supply system. The problem is that it becomes complicated and requires a lot of effort and time to maintain.

An object of the present invention is to provide a bearing device for a horizontal rotating machine that has a simple automatic flow switching mechanism built into the journal bearing and can effectively supply oil only to the thrust bearing on the load side.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows a bearing device for a horizontal rotating machine, in which thrust rotating plates 8a and 8b are provided at a journal portion of a rotating shaft 7 with a predetermined axial distance L between them.

On the other hand, the journal bearing 1 that supports the rotating shaft 7 is supported by a bearing box 11.

Thrust bearings 2a and 2b are attached to both axial ends of the journal bearing 1 so as to face the thrust rotary plate 8 with a predetermined axial allowance.

Furthermore, annular oil reservoirs 12a and 12b are fitted into the outer peripheral axial ends of the journal bearing 1, respectively, and surround the space between the bearing 1 and the thrust rotary plate 8.
Therefore, these oil sump 12 and thrust rotating plate 8
As a result, annular chambers 3a and 3b surrounding the thrust bearing 2 are formed.

On the other hand, a separate oil supply device (not shown) and the pressure receiving surface of the journal bearing 1 are connected to the oil supply path 4 as shown in FIG.
In addition, an oil supply path 5 made of a single pipe reaches the outer circumference of the journal bearing 1. The oil supply passage 5 is bored inside the journal bearing 1 at its outer peripheral portion and communicates with the chambers 3a, 3b through oil supply holes 6a, 6b which branch into two directions.

Now, this journal bearing 1 has a hole 9 that penetrates in the axial direction and intersects with the oil supply holes 6a and 6b.
is drilled. This hole 9 is set to be slightly larger than the diameter of the oil supply hole 6.

An oil passage switching rod 10 having the same diameter is slidably inserted into this hole 9.

The length of this oil passage switching rod 10 is 0.5 to 0.8 mm from the distance L between the two thrust rotary plates 8a and 8b mentioned above.
It is slightly shorter in length and is preferably made of a relatively soft material such as copper or aluminum.

FIG. 4 shows an example of the oil passage switching rod 10, which has two small holes 10a, 10a in the middle in the axial direction.
is penetrated. The relationship between the pitch and size of the small holes 10a, 10a is determined by the allowance between the thrust bearing 2 and the thrust rotating plate 8, that is, the amount of axial movement of the rotating shaft 7.

To explain this in detail with reference to FIG. 5, the oil supply hole 6
Let the pitch at the intersection of a and 6b be P ₁ ,
If the allowance on one side of the rotating shaft is δ, the pitch P ₂ of the small hole 10a of the oil passage switching rod is P ₁ +δ. In this case, the diameter d of the small hole 10a and the oil supply hole 6a,
It is desirable that the diameter of 6b and the dimension of allowance δ match.

Next, the operation will be explained. FIG. 6 shows a state in which thrust force is applied from the left side. Therefore, the thrust rotating plate 8b and the thrust bearing 2b are in sliding contact.

Due to the movement of the rotating shaft 7, the oil passage switching rod 10 is pushed by the thrust rotary plate 8b and moves to the right by an allowance amount. Then, the oil supply hole 6a of the bearing 1 is closed by the oil passage switching rod 10, while the other oil supply hole 6b is closed.
Since the small hole 10a is located at that position, oil is supplied to the thrust bearing 2b side that communicates with the thrust bearing 2b and supports the thrust force as shown by the arrow.

Furthermore, when the thrust direction changes and the thrust force is applied from the right side, oil is supplied only to the thrust bearing 2a side that supports the thrust force by an operation opposite to the above operation.

In this way, depending on the direction of the thrust force, the switching rod 10 automatically operates to supply oil only to the thrust bearing on the side that supports the thrust force.

Therefore, since oil can be supplied only to the thrust load side, no power is wasted for oil feeding. Furthermore, since the oil supply circuit is simplified, maintenance of the oil supply system becomes easier.

As described above, according to the configuration of the present invention, the oil supply path is automatically switched according to the direction of the thrust force, and oil can be supplied only to the bearing that supports the thrust force.
This has the effect that the power for oil feeding can be used effectively and the oil supply circuit can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional bearing device, FIG. 2 is a cross-sectional view of FIG. 1, FIG. 3 is a vertical cross-sectional view of the lower half of a shaft device showing an embodiment of the present invention, and FIG. A perspective view of the oil passage switching rod, Fig. 5 is an explanatory diagram showing the dimensional relationship between the oil supply hole of the journal bearing and the oil passage switching rod, and Fig. 6 is a lower half vertical sectional view of the bearing device to explain the operation of the present invention. It is. 1... Journal bearing, 2... Thrust bearing,
6... Oil supply hole, 7... Rotating shaft, 8... Thrust rotating plate, 9... Hole, 10... Oil path switching rod, 10a...
...Small hole.

Claims (1)

[Scope of utility model registration request] Thrust bearings are provided at both ends of the journal bearing in the axial direction, facing the thrust rotation plate of the rotating shaft, and oil is supplied from a separately installed oil supply device to the thrust bearing through an oil supply hole drilled in the journal bearing. In the bearing device of horizontal rotating machine,
The oil supply holes are branched from the outer periphery of the journal bearing and opened on the thrust bearing side, and a hole is formed in the journal bearing that intersects with both oil supply holes and penetrates in the axial direction. One side of the thrust bearing supports a thrust force by slidingly inserting an oil passage switching rod having two small holes drilled in the pitch, and pushing the oil passage switching rod as the thrust rotating plate moves. 1. A bearing device for a horizontal rotating machine, characterized in that one oil supply hole is communicated with the other by a small hole, and other oil supply holes are closed.