JPH09177797A - Shaft box structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the optimum lubricating condition in a normal condition, and to form an oil bath of sufficient size in a shaft box in an abnormal condition in which no oil air is fed. SOLUTION: A lubricating oil storage container 14 is fixed to an outer surface side of a covering plate 11 with its opening side being directed to the covering plate 11 side, and a space demarcated by the lubricating oil storage container 14 and the covering plate 11 is a lubricating oil storage part 15. A cylindrical hole 2A is communicated with the lubricating oil storage part 15 through a communication hole 16 formed in the covering plate 11. The height of the communication hole 16 is set according to the depth of an oil bath to be formed in the cylindrical port 2A. In addition, an oil discharge port 7 is formed in the lubricating oil storage container 14 to communicate the oil discharge port with an oil tank through a piping 8. The height of the oil discharge port 7 is above the height of the communication hole 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil supply device (oil-air lubrication system) for supplying lubricating oil to an object to be lubricated in a state of moving along the inner wall surface of a pipeline using compressed air (oil air). With regard to the bearing housing structure in which oil air is supplied from the engine, in particular, while obtaining the optimum lubrication condition under normal conditions, a sufficient oil bath is formed inside the housing to prevent seizure etc. It was done so.

[0002]

2. Description of the Related Art As a lubricating oil supply device for supplying an oil air, which is a mixture of lubricating oil and compressed air, to a lubrication object such as a bearing, for example, Japanese Patent Application Laid-Open No. 2-271197 previously proposed by the present applicant. Japanese Patent Application Laid-Open No. 2004-187242 discloses such a conventional technique, a main unit that supplies lubricating oil and compressed air, a mixer that mixes the lubricating oil and compressed air into an oil-air state, and a variety of oil-air types. The basic configuration is a distributor for distributing.

The bearing side, to which the oil air is supplied, is constructed as shown in FIG. 4, for example. That is, FIG. 4 is a cross-sectional view of a bearing unit 1 having a built-in bearing to which oil air is supplied. The bearing unit 1 is rotated by a rolling bearing 3 arranged in a cylindrical hole 2A of a shaft box 2 thereof. The shaft 4 is rotatably supported. Specifically, the inner ring 3a of the rolling bearing 3 is fitted onto the rotary shaft 4 while the outer ring 3b is press-fitted into the cylindrical hole 2A of the shaft box 2.

The outer ring 3b of the rolling bearing 3 is formed with a circumferential groove 3c continuous in the circumferential direction on the outer circumferential surface thereof, and a plurality of radially extending radial grooves communicating between the inner circumferential surface and the circumferential groove 3c. A through hole 3d is formed. On the other hand, an oil supply port 5 for supplying lubricating oil is formed on the upper surface of the shaft box 2, and a space between the oil supply port 5 and the circumferential groove 3c is formed through a through hole 5a formed in the shaft box 2. It is in communication. Then, oil air is supplied to the oil supply port 5 through a pipe 6 from a lubricating oil supply device (not shown).

Further, the shaft box 2 is formed with a drain port 7 for draining excess lubricating oil from the inside thereof, and a through hole 7a is provided between the drain port 7 and the cylindrical hole 2A. Communicate with each other. The oil drainage port 7 communicates with an oil tank (not shown) through a pipe 8 and thereby the cylindrical hole 2
The surplus lubricating oil in A is returned to the oil tank through the through hole 7a, the oil discharge port 7 and the pipe 8.

In the conventional axle box 2, the oil drainage port 7 and the through hole 7a are provided at a position slightly higher than the lowermost portion of the outer ring 3b of the bearing 3, whereby the cylindrical hole 2 is formed.
The oil bath 9 is formed in A. That is, the pipe 6, the oil supply port 5, together with the compressed air from the lubricating oil supply device
Bearing 3 through through hole 5a, circumferential groove 3c and through hole 3d
The lubricating oil supplied to the inside is returned to the oil tank through the through hole 7a, the oil discharge port 7 and the pipe 8 together with the compressed air after being used for lubricating the bearing 3, but a part of the lubricating oil is passed through the through hole 2A. It collects in the lower part of the and forms the oil bath 9.

If such an oil bath 9 is formed, for example, even if there is an abnormality in which new lubricating oil is not supplied into the shaft box 2 due to clogging of the pipe 6 or the pipe 8, for example, the bearing 3 Lubrication is possible, and there is an advantage that the frequency of equipment maintenance can be minimized.

[0008]

However, in the conventional axle box 2 as shown in FIG. 4, the oil bath 9 having a constant depth is always formed in the space in which the rolling bearing 3 is arranged. For equipment in which the rotary shaft 4 rotates at high speed, the oil bath 9
There is a problem in that the temperature of the rolling bearing 3 rises due to the stirring resistance of the lubricating oil that forms the. Therefore, it is desirable for the rolling bearing 3 used at high speed to have a small amount of the oil bath 9, but the height position of the oil discharge port 7 is set so that an extremely small amount of the oil bath 9 is formed. If this happens, there is a possibility that lubrication failure will occur in the event of an abnormal supply of the lubricating oil.

That is, in the conventional axle box 2 shown in FIG.
It was difficult to sufficiently satisfy both the requirement of suppressing the temperature rise of the rolling bearing 3 in the normal state and the requirement of obtaining a good lubrication state even in the abnormal time when the oil air is not supplied. The present invention has been made by paying attention to the unsolved problem of the conventional technique, and while obtaining the optimum lubrication state at the normal time, it can be sufficiently stored in the shaft box at the time of abnormality where oil air is not supplied. It is an object of the present invention to provide a shaft box structure in which a simple oil bath is formed and baking or the like can be prevented.

[0010]

In order to achieve the above-mentioned object, the present invention supplies the lubricating oil from a lubricating oil supply device that uses compressed air to move the lubricating oil along the inner wall surface of the pipeline. And a lubricating oil storage section is provided separately from the bearing space in which the bearing is arranged,
An oil supply port for supplying the lubricating oil into the bearing space, a communication hole for communicating between the bearing space and the lubricating oil storage unit, and for discharging the lubricating oil from the lubricating oil storage unit An oil drainage port is formed, and the height position of the communication hole is lower than the height position of the oil drainage port.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a first embodiment of the present invention, and is a cross-sectional view of a bearing unit 1 lubricated by oil air. First, the configuration will be described. The entire configuration of the oil-air lubrication system is disclosed in the above-mentioned publication previously proposed by the applicant, JP-A-6-201092 and the like previously proposed by the applicant. Therefore, detailed description thereof is omitted here.

That is, in this embodiment, the present invention is applied to a bearing unit 1 for rotatably supporting a rotary shaft 4 provided at both ends of a rolling roll 10 in a continuous casting machine. The shaft box 2 of the unit 1 is formed with a cylindrical hole 2A as a bearing space that communicates between both end surfaces of the unit 1. The rotary shaft 4 is inserted into the cylindrical hole 2A in a non-contact manner, and the tip of the rotary shaft 4 in the cylindrical hole 2A is inserted. The inner ring 3a of the rolling bearing 3 is externally fitted to the portion. The cylindrical hole 2A is a cylindrical hole whose axis is oriented in the left-right direction.

The cylindrical hole 2A has a large diameter portion 2a, a taper portion 2b, a small diameter portion 2c and an oil seal groove 2d, which are arranged in this order from the left end surface in FIG. 1, and the outer ring of the rolling bearing 3 is inside the large diameter portion 2a. 3b is fitted. It should be noted that one end surface of the outer ring 3b is in contact with the step portion between the large diameter portion 2a and the tapered portion 2b, and the other end surface is in contact with the end surface of the cylindrical portion 11a of the closing plate 11 fitted in the large diameter portion 2a. Thus, the rolling bearing 3 is positioned. The oil seal 12 is fitted in the oil seal groove 2d. However, in this embodiment, the tip of the lip that is in sliding contact with the rotating shaft 4 of the oil seal 12 is set to the cylindrical hole 2
Therefore, even when the pipe 8 is closed, the high-pressure air in the cylinder 2A escapes from the gap between the lip and the rotary shaft 4 to the outside through the cylindrical hole 2A.
The inside is kept from extremely high pressure.

At the end surface of the shaft box 2 on the rolling roll 10 side, the oil seal 12 is prevented from falling off, and the oil seal 12 is caused by a relatively large foreign substance coming from the outside.
A circular protective plate 13 is fixed in order to prevent damage to the lip and the like. Then, similarly to the conventional configuration shown in FIG. 4, a peripheral groove 3c and a through hole 3d are formed in the outer ring 3b of the rolling bearing 3, and an oil supply port 5 for supplying lubricating oil is formed on the upper surface of the axle box 2. Is formed, and the oil supply port 5 and the peripheral groove 3c are communicated with each other through a through hole 5a formed in the shaft box 2, and oil air is supplied to the oil supply port 5 through a pipe 6 from a lubricating oil supply device (not shown). It is being supplied.

On the other hand, on the outer surface side (left side in FIG. 1) of the closing plate 11, a lubricating oil storage container 14 having a concave cross section is fixed with its opening side facing the closing plate 11 side. A space defined by 14 and the closing plate 11 serves as a lubricating oil storage unit 15. In this example, the lubricating oil storage unit 15 is
The circular space has the same diameter as the large diameter portion 2a of the cylindrical hole 2A.

The cylindrical hole 2A and the lubricating oil storage portion 15 communicate with each other through a communication hole 16 formed in the closing plate 11. However, the height position of the communication hole 16 is set according to the desired depth of the oil bath 9 formed in the cylindrical hole 2A. For example, in this embodiment, the roller 3e as the rolling element of the rolling bearing 3 when it reaches the lowest position.
However, the distance from the inner peripheral surface of the cylindrical portion 11a to the communication hole 16 is set to about the radius of the roller 3e so that it is immersed in the oil bath 9 for about half.

Further, the lubricating oil storage container 14 has a drain port 7
Is formed, and the oil discharge port 7 and an oil tank (not shown) communicate with each other via a pipe 8. The height position of the oil drain port 7 is higher than the height position of the communication hole 16. For example, in this embodiment, the drainage port 7 is formed at a position approximately 1/4 above the height of the lubricating oil storage portion 15. Next, the operation of the present embodiment will be described.

The oil air supplied from the lubricating oil supply device (not shown) to the oil supply port 5 passes through the through hole 5a and the circumferential groove 3 from there.
c, the lubrication surface of the rolling bearing 3 (the inner ring 3
a outer peripheral surface, outer ring 3b inner peripheral surface). The cylindrical hole 2A accommodating the rolling bearing 3 communicates with the oil tank 9 through the communication hole 16, the lubricating oil storage unit 15, the oil discharge port 7 and the pipe 8. Since the position is set as described above, the oil bath 9 having a desired depth is formed in the cylindrical hole 2A.

Then, oil air is constantly supplied from the lubricating oil supply device into the shaft box 2, and compressed air for conveying the oil air is passed through the communication hole 16, the lubricating oil storage unit 15, the oil discharge port 7 and the pipe 8. Since the exhaust air is exhausted, the excess lubricating oil in the cylindrical hole 2A is sent into the lubricating oil storage portion 15 with the movement of the compressed air, and is returned from there to the oil tank 9 through the oil discharge port 7 and the pipe 8. .

In this case, the cylindrical hole 2A and the lubricating oil storage section 15
And the compressed air flowing from the cylindrical hole 2A into the lubricating oil storage portion 15 are communicated with each other through the communication hole 16 formed at a position lower than the oil discharge port 7.
It will flow from the bottom to the top. Then, together with the compressed air, the lubricating oil storage unit 15 is discharged from the cylindrical hole 2A.
The lubricating oil that has flowed into the lubricating oil storage unit 15 flows upward so as to rise along the inner wall surface of the lubricating oil storage unit 15.
The oil sump 17 is formed inside. That is, by appropriately selecting the inner diameter of the communication hole 16, the flow velocity of the compressed air in the communication hole 16 can be made sufficiently high, so that the lubricating oil that has flowed into the lubricating oil storage portion 15 flows backward in the communication hole 16. Therefore, the oil sump 17 is formed along the inner wall surface of the lubricating oil storage portion 15. However, if the lubricating oil storage portion 15 is too narrow, the lubricating oil storage portion 1
Due to the flow of compressed air in 5, most of the lubricating oil is drained 7
It is desirable that the lubricating oil storage section 15 has a certain size because it may be discharged from the oil reservoir and the sufficient oil sump 17 may not be formed.

The oil sump 17 formed in the lubricating oil storage portion 15 is not agitated even when the rolling bearing 3 rotates at high speed, so that the oil sump 17 allows the rolling bearing 3 to rotate.
There is no problem that the temperature rises. On the other hand, when oil air is not supplied into the shaft box 2 due to, for example, the pipe 6 or the pipe 8 being blocked, the flow of compressed air passing through the communication hole 16 naturally stops, so that the oil sump 17 is supported. Lost power. Then the oil sump 1
7 collapses due to its own weight, and the lubricating oil forming the oil sump 17 flows backward in the communication hole 16 and flows into the cylindrical hole 2A, increasing the oil bath 9.

As a result, the rolling bearing 3 is lubricated by the oil bath 9 having an increased capacity, so that good lubrication is performed even in the abnormal time when new lubricating oil is not supplied, and when the abnormality occurs, It is possible to avoid that the rolling bearing 3 is immediately burned. Therefore, the frequency of maintenance can be minimized, so even if it is applied to a continuous casting machine that has many guide rolls, pinch rolls, etc. and may reach several hundred lubrication points, It is possible to avoid enormous effort and cost.

As described above, in the present embodiment, the depth of the oil bath 9 in the normal state can be suppressed to the necessary minimum, so that the stirring resistance is minimized to raise the temperature of the rolling bearing 3. This can be avoided, and at the time of abnormality where oil air is not supplied, a sufficient amount of the oil bath 9 can be formed to prevent seizure of the rolling bearing 3. In other words, it is possible to sufficiently satisfy both of the two contradictory requirements that were conventionally required.

FIG. 2 is a view showing a second embodiment of the present invention, which is also similar to the first embodiment, in which the rotary shafts 4 provided at both ends of the rolling roll 10 are rotatable. The present invention is applied to the bearing unit 1 that is supported by the.
The same members and portions as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. That is, in the present embodiment, the height position of the communication hole 16 is set to the same height as the inner peripheral surface of the cylindrical portion 11a of the closing plate 11, so that the oil bath 9 is not formed during normal operation. I have to. That is, in the normal state, the rolling bearing 3 is lubricated by the fresh and necessary minimum oil air which is constantly supplied, and in the abnormal state, as in the first embodiment,
The rolling bearing 3 is lubricated by an oil bath formed by the collapse of the oil sump 17.

Therefore, as in the first embodiment,
Both of the two contradictory requirements, which have hitherto been contradictory, can be sufficiently satisfied, and the oil bath 9 is not normally formed, which is particularly useful for the bearing unit 1 used at high speed rotation. The size of the oil bath 9 can be adjusted by selecting the height position of the communication hole 16. For example, as in the second embodiment, the cylindrical portion 1 can be adjusted.
If the communication hole 16 is formed close to the inner peripheral surface of 1a,
Since the height position of the communication hole 16 can be changed and the size of the oil bath 9 to be formed can be adjusted only by selecting the mounting angle of the closing plate 11 with respect to the cylindrical hole 2A, the bearings having different rotational speeds can be used. There is an advantage that the closing plate 11 can be shared by the units 1 and the cost can be reduced.

FIG. 3 is a view showing a third embodiment of the present invention, which is also the same as the first embodiment, in which the rotary shafts 4 provided at both ends of the rolling roll 10 are rotatable. The present invention is applied to the bearing unit 1 that is supported by the.
The same members and portions as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. That is, in the present embodiment, unlike the first and second embodiments, the lubricating oil storage section 15 is not provided integrally with the axle box 2, but a box separate from the axle box 2. Type lubricating oil storage container 1
4 is provided, and the inside thereof is used as the lubricating oil storage unit 15.

Specifically, a through hole 11b formed in the closing plate 11 for closing the cylindrical hole 2A of the shaft box 2 and a through hole 14a formed in the lubricating oil storage container 14 are connected to each other through a pipe 18. I am letting you. However, the through hole 11b is formed in the cylindrical portion 1
It is formed at the lowest position in the cylindrical hole 2A close to the inner peripheral surface of 1a, the height position of the through hole 14a is higher than the height position of the through hole 11b, and the height position of the oil drain port 7 penetrates. Hole 14a
It is higher than the height position. The through hole 11b
The height positions of 14a and 14a may be the same, or the sump 1
When the capacity of 7 is sufficient, the height position of the through hole 14a may be lower than the height position of the through hole 11b, but even in that case, the height position of the oil drainage port 7 is higher than that of the through hole 11b. It must be higher than the position.

Even in the case of such a configuration, in a normal state,
The rolling bearing 3 is lubricated by the fresh and minimum necessary oil air that is constantly supplied, and when the abnormality occurs, the rolling bearing 3 is lubricated by the oil bath formed by the collapse of the oil reservoir 17. Similar to the first or second embodiment, it is possible to sufficiently satisfy both of the two contradictory requirements in the related art.

In the present embodiment, the axle box 2
There is an advantage that it can be applied even when there is no room to form the lubricating oil storage portion 15 therein. Further, when applied to existing equipment, there is an advantage that the application is easy. Here, in the third embodiment,
The through hole 11b, the pipe 18 and the through hole 14a form a communication hole in the present invention.

In the structure of the third embodiment, the lubricating oil storage container 14 can be omitted if the portion of the pipe 18 facing upward with the end on the shaft box 2 side facing downward is sufficiently long. The inside of 18 can be used substantially as a lubricating oil storage unit, which is more advantageous in terms of cost. In this case, for example, if the pipe 18 is formed in a spiral shape, the space for disposing the pipe 18 can be reduced, and therefore the advantage at the application site is great.

Although not particularly shown, the above first to third
In the embodiment of the present invention, if a device for monitoring the operating state of the mixer of the oil-air lubrication system is provided and an abnormal state in which only compressed air is supplied into the axle box 2 is detected, lubrication failure will occur. Can be avoided more reliably. That is, according to the first to third embodiments, even if the compressed air and the lubricating oil are not supplied to the shaft box 2 due to the clogging of the pipes 6 and 8, the rolling bearing 3 is immediately stopped. Although there will be no situation such as seizure, a large amount of oil bath will not be formed in the abnormal case in which only compressed air is supplied to the axle box 2, so there is a possibility of poor lubrication. Therefore, if the abnormality that is constantly monitored is limited to only the latter, it is possible to reduce the possibility of occurrence of lubrication failure while minimizing the trouble of abnormality monitoring.

[0032]

As described above, according to the present invention,
A lubricating oil storage section is provided separately from the bearing space, an oil supply port for supplying the lubricating oil into the bearing space, a communication hole communicating between the bearing space and the lubricating oil storage section, and a lubricating oil storage section. A drain port for draining the lubricating oil is formed from the above, and the height position of the communication hole is set lower than the height position of the drain port. Therefore, it is possible to prevent the bearing from immediately seizing when an abnormality occurs while suppressing the temperature rise of the bearing in the normal state.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional configuration.

[Explanation of symbols]

 1 Bearing Unit 2 Shaft Box 2A Cylindrical Hole (Bearing Space) 3 Rolling Bearing 4 Rotating Shaft 5 Lubrication Port 6 Piping 7 Drain Port 8 Piping 9 Oil Bath 11 Closure Plate 11b Through Hole (Communication Hole) 14 Lubricating Oil Storage Container 14a Through Hole (communication hole) 15 Lubricating oil storage 16 Communication hole 17 Oil sump 18 Piping (communication hole)

Claims (1)

[Claims] 1. A shaft box structure of a bearing to which the lubricating oil is supplied from a lubricating oil supply device for moving the lubricating oil along the inner wall surface of a pipe line by using compressed air, wherein the bearing is provided. The lubricating oil storage section is provided separately from the bearing space
An oil supply port for supplying the lubricating oil into the bearing space, a communication hole for communicating between the bearing space and the lubricating oil storage unit, and for discharging the lubricating oil from the lubricating oil storage unit An oil drainage port is formed, and a height position of the communication hole is lower than a height position of the oil drainage port.