JP2000266066A - Bearing lubrication and bearing lubricating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the rotational properties of the rotation side annular body supported by a bearing for oil-air lubrication and the sealing performance of a space to which oil-air is supplied. SOLUTION: This method of oil-air lubricating a bearing 1 disposed in facing annular space 4 between two ring bodies 2, 3 disposed on the inside and outside radially and concentrically seals the facing annular space 4 in which the bearing 1 is disposed using a non-contact seal 5, and forcedly suctions and discharges oil-air in the space 4 to the outside while oil-air is being supplied to the space 4 by means of required pressure. Use of the non-contact seal 5 permits the rotational resistance of the rotation side annular body 3 to be reduced, and forcible suctioning and discharging of the oil-air prevents the oil-air from leaking through the non-contact sealing part of the non-contact seal 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and a device for lubricating a bearing device with oil air. In addition, as the above-mentioned bearing device, for example, there is a bearing device used for a rotation support portion of a transport path for transporting rolled materials or food-related articles.

[0002]

2. Description of the Related Art A bearing device to be subjected to oil-air lubrication is interposed in opposed annular spaces of two annular members arranged concentrically inside and outside in the radial direction to support rotation of a rotating annular member.

[0003] In order to perform oil-air lubrication on such a bearing device, the bearing device is arranged by disposing a seal at an axial end open to the outside of the above-mentioned non-rotating side ring. Sealing the opposing annular space,
It is necessary to provide an oil supply path and an oil discharge path in the non-rotating side ring.

The bearing device is lubricated by supplying oil air from the oil supply path into the space, and then discharged to an external recovery tank through an oil discharge path.

[0005]

In the case where a non-contact type seal is used as a seal for sealing a space in which the bearing device is disposed, it is advantageous in reducing the rotational resistance of the rotating ring body. The sealing performance is inferior, for example, the oil air in the space is easily scattered outside from the non-contact sealing portion of the non-contact type seal.

On the other hand, when a contact-type seal is used as the above-mentioned seal, the sealability of the space is excellent.
Due to the sliding resistance of the contact-type seal, the rotational resistance of the rotating ring is likely to increase.

As described above, it is necessary to properly use the above-mentioned non-contact type seal and the contact type seal having both advantages and disadvantages in consideration of the place where the bearing device is used.
If the above-mentioned bearing device is used as a rotating support portion of a transport path for transporting rolled materials or food-related articles, in order to lubricate the bearing device with respect to the rolled material or food-related articles to be transported. However, it is necessary to use a contact-type seal with high hermeticity.However, there is a possibility that the transfer of articles may become difficult due to an increase in rotational resistance. is there.

In view of such circumstances, the present invention provides a method and an apparatus for improving the rotational characteristics of a rotating side ring body supported by a bearing device to be subjected to oil-air lubrication and the sealing performance of a space to which oil air is supplied. It is intended to be provided.

[0009]

According to a first aspect of the present invention, there is provided a bearing lubrication method, comprising: a bearing device disposed in an opposed annular space between two annular members disposed concentrically inside and outside in a radial direction. Lubricating with oil air, the opposed annular space in which the bearing device is disposed is sealed using a non-contact type seal, and while supplying the oil air to this space at a required pressure, the oil air in the space is forcibly externally applied. It is intended to be sucked and discharged.

[0010] The bearing lubricating apparatus according to the second aspect of the present invention comprises:
A bearing device disposed in an opposed annular space between two annular members arranged concentrically inside and outside in the radial direction is lubricated with oil air, and an axially open end of the bearing device in the opposed annular space. A non-contact type seal that seals the space, an oil supply element that supplies oil air to the space at a required pressure, and a suction element that forcibly sucks and discharges the oil air supplied to the space to the outside. Including.

The bearing lubrication device according to the invention of claim 3 is
The oil supply element according to claim 2 sends oil by compressed air.

A bearing lubricating device according to a fourth aspect of the present invention comprises:
The suction element according to claim 3 is an ejector pump that generates a suction force by generating a negative pressure by compressed air supplied from the oil supply element.

As described above, in the present invention, the rotation resistance is reduced by using a non-contact type seal as a seal for sealing the opposed annular space in which the bearing device is disposed. And, by making a forced suction form as an external discharge form of the oil air in the space,
Since the outside air is drawn into the space through the non-contact sealing portion of the non-contact type seal, oil air supplied into the space scatters outside from the non-contact sealing portion of the non-contact type seal as in the related art. In addition to this, the residence time of the oil air in the space is shortened and the stirring resistance of the bearing device due to the oil is reduced.

In particular, according to the fourth aspect of the present invention, since the lubrication power of the oil supply element can be used as the suction power of the suction element, it is not necessary to separately prepare the power source of the suction element and the power source of the oil supply element.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a configuration diagram of a bearing lubrication device, and FIG. 2 is a cross-sectional view of the ejector pump in FIG.

In FIG. 1, reference numeral 1 denotes a bearing device to be lubricated. The bearing device 1 rotatably supports the rotating shaft 3 with respect to the inner periphery of the case 2, and is formed by combining one or more of various types of rolling bearings. The above-described rotating shaft 3 is, for example, both ends of a roller or the like provided in the article transport path.

The opposed annular space 4 between the case 2 in which the bearing device 1 is disposed and the rotating shaft 3 is sealed by labyrinth packings 5 and 5 as non-contact type seals. The labyrinth packings 5 and 5 are attached to both ends in the axial direction of the inner peripheral surface of the case 2 so as to face the outer peripheral surface of the rotating shaft 3 with a small gap therebetween.

The bearing device 1 in the sealed space 4 includes:
Cooling and lubrication are performed by oil air supplied from the outside. In order to supply the oil air to the space 4, an oil supply passage 6 is provided at a required position in the upper half of the case 2. In order to discharge the oil air supplied into the space 4 to the outside, an oil discharge passage 7 is provided at a required position in the lower half of the case 2. A bearing lubrication device (not shown) described below is attached to the oil supply passage 6 and the oil discharge passage 7.

The bearing lubrication device of this embodiment includes a lubrication unit 10 as a lubrication element, an ejector pump 20 as a suction element, and a recovery tank 30.

The oil supply unit 10 includes an oil supply source 11 for supplying oil, an air source 12 such as a compressor, an air pump, and an air cylinder for supplying compressed air, and a mixing block for mixing oil and compressed air and supplying the mixed air to the space 4. 13 for supplying oil air to the bearing device 1 in the sealed space 4. The oil air discharge portion of the mixing block 13 is provided at a required position in the upper half of the case 2 described above.
Is connected via a pipe 40.

The ejector pump 20 is generally well-known, and the inside of the space 4 is brought into a negative pressure state with the passage of compressed air supplied from the air source 12 of the refueling unit 10.
Forcibly discharge and discharge the oil air in the collection tank 30
To send to. The main passage 2 of the ejector pump 20
1 is connected to a discharge portion of the air source 12 of the refueling unit 10, and the low-pressure portion 22 is connected to the oil discharge passage 7 of the case 2 via pipes 41 and 42, respectively.

The recovery tank 30 stores the oil component of the oil air that has been forcibly sucked from the space 4 by the ejector pump 20.

Next, the lubrication mode of the bearing device 1 will be described. Oil introduced from oil supply source 11 and compressed air introduced from air source 12 (for example, 0.3 to 0.5 MPa)
Are mixed in the mixing block 13, and oil air (for example, 0.05 to 0.2 MPa) is supplied into the space 4 in which the bearing device 1 is provided via the pipe 40 and the oil supply path 6. This oil air cools and lubricates the bearing device 1.

At the same time, compressed air from the air source 12 is supplied to the main passage 21 of the ejector pump 20 via the pipe 41. With the passage of the compressed air, the low pressure of the ejector pump 20 is reduced. Since the section 22 is in a negative pressure state, the oil drain passage 7 and the pipe 4 communicating with the low pressure section 22 are formed.
The oil air in the space 4 is forcibly sucked and discharged through 2.

As described above, since the oil air in the space 4 is forcibly sucked and discharged, the space 4
The outside air is sucked into the space 4 through the non-contact sealing portions of the labyrinth packings 5, 5 for sealing the oil, so that the oil air supplied into the space 4 does not contact the labyrinth packings 5, 5. Spattering from the part to the outside is prevented.

As described above, since the labyrinth packings 5, 5 as non-contact type seals are used to seal the opposed annular space 4 in which the bearing device 1 is disposed, the sliding resistance of the seals, that is, the rotating shaft is used. 3 can reduce the rotational resistance. Further, since the oil air in the space 4 is forcibly sucked and discharged as described above, the outside of the oil air from the non-contact sealing portions of the labyrinth packings 5, 5 can be prevented from being scattered to the outside, and the sealing performance is improved. Can be enhanced. In addition, the staying time of the oil air in the space 4 can be shortened by the suction and discharge described above, so that the stirring resistance of the bearing device 1 due to the oil is reduced. This is advantageous in reducing the amount of light.

Note that the present invention is not limited to only those described in the above embodiment, and various applications and modifications are conceivable.

(1) In the above embodiment, the ejector pump 20 is used as the suction element, but a vacuum pump or the like can be used.

(2) In the above embodiment, the labyrinth packings 5, 5 are provided on both sides in the axial direction of the bearing device 1, but both ends of the rotating shaft 53 are provided in the case 52 as shown in FIG. It is also possible to adopt an embodiment in which the space 54 on one side of the case 52 is a sealed space and the labyrinth packing 5 is provided only on the other side, supported by the bearing device 1.

(3) In the above-described embodiment, the form in which the bearing device 1 for rotatably supporting the rotating shaft 3 on the case 2 is exemplified, but the outer ring (2) is replaced with the inner ring (3).
The bearing device 1 that is rotatably supported on the bearing device 1 may be lubricated. In that case, it is preferable to provide an oil supply passage for the non-rotating side ring. FIG. 4 shows a specific example of such an embodiment. Fixed shaft 6 fixed to cases 62 and 63
The roller 69 is rotatably connected to the roller 4 via the bearing devices 61, 61.
And a labyrinth seal 6 for sealing an annular space between the roller 69 and the fixed shaft 64 is provided at both ends of the roller 69.
5,65 are provided. An oil supply passage 66 is formed inside the case 63 and the fixed shaft 64, and an oil discharge passage 67 is formed inside the case 63 and the fixed shaft 64. As in the above-described embodiment, the oil air supplied from the oil supply passage 66 is supplied to the annular space 71, the sealing devices 61, 61, and the space 7.
After passing through 4, 74, the oil is discharged from the oil discharge passage 67. Note that the present embodiment is used for a transport device that transports an article using the rollers 69 and the like.

[0032]

According to the first to fourth aspects of the present invention, the sealing performance of the space in which the bearing device to be lubricated is disposed is improved, and the rotational resistance of the rotating side ring body supported by the bearing device to be lubricated is improved. Can be reduced. In this way, it is possible to eliminate the adverse effects that can occur when lubricating the bearing device with oil air.

In particular, when the ejector pump is used as the suction element as in the invention of claim 4, the oil supply power of the oil supply element can be used as the suction power, so that the power source of the suction element and the power source of the oil supply element are separately provided. It is possible to contribute to the reduction of equipment costs, for example, by eliminating the need for preparation.

As described above, according to the present invention, it is possible to improve the operating performance of the bearing device by eliminating the external leakage of the oil air that lubricates the bearing device, so that the bearing device to be lubricated is required to have high cleanliness. This is suitable for use in such places.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a bearing lubrication device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the ejector pump of FIG. 1;

FIG. 3 is a configuration diagram of a bearing lubrication device according to Embodiment 2 of the present invention.

FIG. 4 is a configuration diagram of a bearing lubrication device according to Embodiment 3 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing device 2 Case 3 Rotating shaft 4 Space 5 Labyrinth packing as non-contact type seal 6 Oil supply path of case 1 7 Oil discharge path of case 1 10 Oil supply unit as oil supply element 20 Ejector pump as suction element 30 Recovery tank

Claims (4)

[Claims] 1. A method of lubricating a bearing device disposed in an opposed annular space between two annular members disposed concentrically inside and outside in a radial direction with oil air, wherein the bearing device is disposed. The opposed annular space is sealed using a non-contact type seal, and while the oil air is supplied to this space at a required pressure, the oil air in the space is forcibly sucked and discharged to the outside.
A bearing lubrication method characterized by the above-mentioned. 2. A device for lubricating a bearing device disposed in an opposed annular space between two annular members disposed concentrically inside and outside in a radial direction with oil air, wherein the bearing device is provided in the opposed annular space. A non-contact type seal disposed at the axially open end of the space for sealing the space, an oil supply element for supplying oil air to the space at a required pressure, and forcibly supplying the oil air supplied to the space to the outside. A bearing lubrication device, comprising: a suction element for sucking and discharging. 3. The bearing lubrication device according to claim 2, wherein the oil supply element sends oil by compressed air.
A bearing lubrication device characterized by the above-mentioned. 4. The bearing lubrication device according to claim 3, wherein the suction element is an ejector pump that generates a suction force by generating a negative pressure by compressed air supplied from the oil supply element. Bearing lubrication device.