JP2011185400A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device from which oil hardly leaks to the outside. <P>SOLUTION: First and second sealing devices 53, 54 are axially arranged in two lines with spaced from each other, on one side in an axial direction of a roll shaft 1. An air introduction hole, and an oil return passage 100 making a second chamber 98 between a first sealing device and a second sealing device communicate with a first chamber 97 in which a self-aligning roller bearing 3 is disposed, are formed in a member constituted of an axle box 2 and a spacer 80 fitted in the axle box 2 and fixed thereto. An opening on a first chamber 97 side of the oil return passage 100 is formed above lubricant 96. The air inlet hole is formed above the oil return passage 100. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rolling bearing device, and more particularly to a rolling bearing device suitable for use in a plummer block.

  Conventionally, as a rolling bearing device, there is one described in Japanese Utility Model Publication No. 63-198354 (Patent Document 1).

  The rolling bearing device includes a housing, a rotating shaft, a ball bearing, a first sealing device, and a second sealing device, and the ball bearing is disposed between the inner peripheral surface of the housing and the outer peripheral surface of the rotating shaft. ing. The rotating shaft extends in the horizontal direction. In a first chamber surrounded by the housing and the rotating shaft and in which the ball bearings are arranged, an oil tank exists below the rotating shaft, and oil is collected in the oil tank.

  The first sealing device and the second sealing device seal an opening on one side in the axial direction between the inner peripheral surface of the housing and the outer peripheral surface of the rotating shaft. Each of the first sealing device and the second sealing device is annular and is arranged in two rows in the axial direction. The first sealing device is located inward in the axial direction with respect to the second sealing device.

  The housing has an oil return passage inside thereof. Both of the two openings of the oil return passage are open on the inner peripheral surface of the housing.

  The oil return passage communicates between the housing, the rotary shaft, the second chamber surrounded by the first sealing device and the second sealing device, and the oil tank of the first chamber.

  This rolling bearing device makes effective use of oil by allowing oil that has passed through the first sealing device and entered the second chamber to return to the oil tank in the first chamber through the oil return passage. .

Japanese Utility Model Publication No. 63-198354

  The present inventor has found that in the rolling bearing device having the above-described conventional configuration, oil is likely to leak to the outside from the second outer sealing device in the axial direction.

  Accordingly, an object of the present invention is to provide a rolling bearing device in which oil does not easily leak to the outside.

In order to solve the above problems, the rolling bearing device of the present invention is
A housing having an inner peripheral surface;
A shaft member having an outer peripheral surface;
A rolling bearing having an outer ring fitted on the inner circumferential surface of the housing, an inner ring fitted on the outer circumferential surface of the shaft member, and a rolling element disposed between the outer ring and the inner ring; ,
A first sealing device for sealing between the housing and the shaft member on one axial side of the shaft member;
A second sealing device that seals between the housing and the shaft member on one side in the axial direction, and is positioned outward in the axial direction from the first sealing device;
A first chamber located on the opposite side of the first sealing device in the axial direction from the second sealing device between the housing and the shaft member;
A second chamber surrounded by the housing, the shaft member, the first sealing device, and the second sealing device;
A lubricating oil provided in a lubricating oil reservoir in the lower part of the first chamber,
The housing is
An oil return passage having one end opened above the lubricating oil on the inner surface of the first chamber and the other end opened on the inner surface of the second chamber;
An air conduction hole having one end opened above the opening of the oil return passage on the inner surface of the first chamber and the other end opened above the opening of the oil return passage on the inner surface of the second chamber. Have
A cross-sectional area of the air conduction hole is larger than a cross-sectional area of the oil return passage.

  The present inventor has found that the cause of oil leakage in the conventional rolling bearing is generated by the following mechanism.

  That is, when the temperature in the first room in which the rolling bearing is arranged rises due to heat generated in the rolling bearing or the like, the gas pressure in the first room rises accordingly. Then, the lubricating oil in the lubricating oil reservoir is pressed by the atmospheric pressure of the gas in the first chamber, and the water level of the lubricating oil is lowered. Then, due to this, the lubricating oil in the lubricating oil reservoir passes through the oil return passage and flows back toward the second chamber, and the amount of oil in the second chamber increases. As a result, the oil in the second chamber easily passes through the second outer sealing device in the axial direction and leaks to the outside.

  On the other hand, according to the present invention, one end of the oil return passage of the housing on the first chamber side opens above the lubricating oil on the inner surface of the first chamber. Regardless, the lubricating oil hardly flows back from the first chamber to the second chamber through the oil return passage. Therefore, even if the pressure in the first chamber rises, the amount of the lubricating oil in the second chamber hardly increases, and leakage of the lubricating oil based on the rise in the pressure in the first chamber does not occur. . Therefore, the amount of lubricating oil that leaks to the outside can be reduced.

  Further, according to the present invention, one end of the housing opens above the opening of the oil return passage on the inner surface of the first chamber, and the other end of the housing opens on the inner surface of the second chamber. Since the air conduction hole that opens upward is provided, the air pressure in the first chamber can always be substantially the same as the air pressure in the second chamber. Therefore, the lubricating oil in the first chamber does not move to the second chamber via the oil return passage due to the pressure in the first chamber being higher than the pressure in the second chamber, and the second chamber The flow of oil that moves from the first chamber to the first chamber via the oil return passage is hardly obstructed. Therefore, the amount of lubricating oil that leaks to the outside can be further reduced.

  Further, according to the present invention, since the cross-sectional area of the air conduction hole is larger than the cross-sectional area of the oil return passage, the air conduction hole is not easily clogged with foreign matters such as lubricating oil. Therefore, it can be suppressed that the air conduction hole does not perform the pressure adjustment effect due to the clogging of foreign matter.

In one embodiment,
The length of the air conduction hole in the extending direction is shorter than the length of the oil return passage in the extending direction.

  According to the embodiment, since the length of the air conduction hole in the extending direction is shorter than the length of the oil return passage in the extending direction, the air conduction hole is not easily clogged with foreign matter. Therefore, it can be further suppressed that the air conduction hole does not perform the pressure adjustment effect due to the clogging of foreign matter.

  According to the rolling bearing device of the present invention, the one end on the first chamber side of the oil return passage of the housing is opened above the lubricating oil on the inner surface of the first chamber. Regardless, the lubricating oil hardly flows back from the first chamber to the second chamber via the oil return passage, and the amount of lubricating oil in the second chamber increases even if the pressure in the first chamber rises. Absent. Therefore, there is no leakage to the outside of the lubricating oil based on the increase in the pressure in the first chamber, and the amount of the lubricating oil that leaks to the outside can be reduced.

  According to the rolling bearing device of the present invention, one end of the housing opens above the opening of the oil return passage on the inner surface of the first chamber, while the other end of the housing opens on the inner surface of the second chamber. Since the air conduction hole that opens upward is provided, the air pressure in the first chamber can always be substantially the same as the air pressure in the second chamber. Therefore, even if the temperature in the first chamber rises, the lubricating oil in the first chamber does not move to the second chamber via the oil return passage, and the first chamber passes from the second chamber via the oil return passage. The flow of oil moving to the chamber is not hindered. Therefore, the amount of lubricating oil that leaks to the outside can be further reduced.

  Further, according to the rolling bearing device of the present invention, since the cross-sectional area of the air conduction hole is larger than the cross-sectional area of the oil return passage, the air conduction hole is hardly clogged with foreign matter. Therefore, it can be suppressed that the air conduction hole does not perform the atmospheric pressure adjustment effect due to the clogging of foreign matter.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view in the axial direction of a plummer block for explaining an outline of the plummer block that is an embodiment of the rolling bearing device of the invention. It is a partial expanded sectional view of the periphery of the 2nd sealing part in a plummer block. It is a partial front view which shows a part of front of the said plummer block.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view in the axial direction of a plummer block for explaining the outline of the plummer block which is an embodiment of the rolling bearing device of the present invention.

  This plummer block includes a rotating shaft 1 as a shaft member, a shaft box 2, a self-aligning roller bearing 3 as an example of a rolling bearing disposed in the shaft box 2, a first sealing portion 4, and a second sealing portion. And a sealing portion 5.

  The rotating shaft 1 is used in a tunnel blower. The axle box 2 includes an upper axle box division body 21 and a lower axle box division body 22. The upper shaft box divided body 21 and the lower shaft box divided body 22 are coupled and integrated with a bolt (not shown). The axle box 2 has a cylindrical inner peripheral surface 24 and an oil supply hole 25 that opens to the cylindrical inner peripheral surface 24. The oil supply hole 25 is formed in the upper shaft box split body 21 and extends in a substantially vertical direction. The oil supply hole 25 is closed by a stopper 30 when oil is not supplied.

  The self-aligning roller bearing 3 includes an outer ring 31, an inner ring 32, a plurality of barrel-shaped first convex rollers 33, a plurality of barrel-shaped second convex rollers 34, and an adapter sleeve 37.

  The outer ring 31 is fitted and fixed to the cylindrical inner peripheral surface 24. An adapter sleeve 37 is externally fitted and fixed to the outer peripheral surface of the rotating shaft 1. The adapter sleeve 37 has a cylindrical inner peripheral surface and a tapered outer peripheral surface, and the cylindrical inner peripheral surface is externally fitted and fixed to the cylindrical outer peripheral surface of the rotating shaft 1. The inner ring 32 has a tapered inner peripheral surface 38, and the tapered inner peripheral surface 38 is externally fitted and fixed to the tapered outer peripheral surface of the adapter sleeve 37.

  The plurality of first convex rollers 33 are held by a cage between the spherical raceway of the outer ring 31 and the raceway of the groove radius having substantially the same radius as the spherical raceway of the outer ring 31 of the inner ring 32. Thus, they are arranged in a state of being spaced apart from each other in the circumferential direction. In the plurality of first convex rollers 33, the radius of the outer diameter surface in the cross section including the axial center is substantially the same as the radius of the spherical raceway of the outer ring 31. The plurality of second convex rollers 34 are held by a cage between the spherical raceway of the outer ring 31 and a raceway having a radius that is substantially the same as the radius of the spherical raceway of the outer ring 31 of the inner ring 32. In such a state, they are arranged in a circumferentially spaced state. In the plurality of second convex rollers 34, the radius of the outer diameter surface in the cross section including the axial center is substantially the same as the radius of the spherical raceway of the outer ring 31. The second convex roller 34 is located at an interval in the axial direction with respect to the first convex roller 33.

  The self-aligning roller bearing 3 automatically adjusts the large deflection and misalignment of the rotating shaft 1 and the housing 2 by aligning. In addition, the self-aligning roller bearing facilitates attachment to and removal from the rotary shaft 1 by introducing an adapter sleeve 37.

  The first sealing portion 4 seals between the axle box 2 and the rotary shaft 1 on one side in the axial direction of the plummer block, while the second sealing portion 5 is the other side in the axial direction of the plummer block. On the side, the space between the axle box 2 and the rotary shaft 1 is sealed.

  The first sealing part 4 has a first sealing device 50 and a second sealing device 51, and each of the first sealing device 50 and the second sealing device 51 is between the shaft box 2 and the rotary shaft 1. Sealed. The first sealing device 50 is disposed at an interval in the axial direction with respect to the second sealing device 51. The first sealing device 50 is located more inward in the axial direction than the second sealing device 51.

  The second sealing portion 5 includes a first sealing device 53 and a second sealing device 54, and each of the first sealing device 53 and the second sealing device 54 is provided between the shaft box 2 and the rotary shaft 1. Sealed. The first sealing device 53 is disposed at an interval in the axial direction with respect to the second sealing device 54. The first sealing device 53 is located more inward in the axial direction than the second sealing device 54.

  In FIG. 1, reference numeral 60 indicates the liquid level of the lubricating oil existing in the plummer block. In the plummer block, there is a lubricating oil reservoir in a region below the liquid level 60, and the lubricating oil reservoir is filled with lubricating oil.

  FIG. 2 is an enlarged sectional view in the axial direction showing an end portion of the lower shaft box division body 22 on the second sealing portion 5 side.

  As shown in FIG. 2, each of the 1st sealing device 53 and the 2nd sealing device 54 which comprises the 2nd sealing part 5 has a cyclic | annular main-body part and a garter spring.

  As shown in FIG. 2, each of the annular main bodies is made of an elastic body bent in a cross-sectional shape, and the outer peripheral surface of the elastic body is fitted and fixed to the inner peripheral surface of the axle box 2. On the other hand, the inner peripheral surface of the elastic body slides on the outer peripheral surface of the rotating shaft 1. Each garter spring urges the lip portion of the elastic body in sliding contact with the rotating shaft 1 inward in the radial direction.

  As shown in FIG. 2, an annular spacer 80 is fitted and fixed to the inner peripheral surface of the axle box 2. The spacer 80 is disposed between the first sealing device 53 and the second sealing device 54. The spacer 80 plays a role of setting a predetermined distance between the first sealing device 53 and the second sealing device 54 in the axial direction. The spacer 80 has a through hole 88 penetrating in the radial direction. One end in the radial direction of the through hole 88 communicates with the space between the first sealing device 53 and the second sealing device 54.

  The lower shaft box division 22 has a through hole 85. The through hole 85 has an axially extending portion 90 and a radially extending portion 91. The axially extending portion 90 extends substantially in the axial direction of the axle box 2. The axially extending portion 90 is located above the liquid level 60 of the lubricating oil 96. The axially outward end of the axially extending portion 90 is sealed, while the axially inward end of the axially extending portion 90 is provided with the self-aligning roller bearing 3. The first chamber 97 is open.

  On the other hand, the radial extending portion 91 extends in the radial direction of the axle box 2. One end of the radially extending portion 91 in the radial direction communicates with the axially extending portion 90, while one radially inner end of the radially extending portion 91 penetrates the spacer 80. It communicates with the hole 88. The through hole 85 of the lower shaft box divided body 22 and the through hole 88 of the spacer 80 constitute an oil return passage 100.

  As described above, the chamber in which the self-aligning roller bearing 3, which is a sealed chamber located on the side opposite to the second sealing device 54 side in the axial direction of the first sealed chamber 53, is disposed in the first sealed chamber 53. A chamber 97 is formed. The chamber surrounded by the rotary shaft 1, the first sealing device 53, the second sealing device 54, and the spacer 80 constitutes a second chamber 98.

  FIG. 3 is a partial front view showing a part of the front of the plummer block.

  As shown in FIG. 3, the axle box 2 has an air conduction hole 99 in addition to the oil return passage 100 therein. The cross-sectional area of the air conduction hole 99 is larger than the cross-sectional area of the oil return passage 100. The air conduction hole 99 is located above the oil return passage 100 in the vertical direction. Although not shown, the air conduction hole 99 communicates the first chamber 97 and the second chamber 98. The length of the air conduction hole 99 in the extending direction is shorter than the length of the oil return passage 100 in the extending direction.

  Although not described in detail, the structure around the first sealing device 4 (see FIG. 1) is the same as the structure around the second sealing device 5 shown in FIG. The structure of the oil return passage around the first sealing device 5 and the structure of the air conduction hole will be omitted in the description of the periphery of the second sealing device 5. The axle box 2, the spacer 80, and the spacer 81 (see FIG. 1) constitute a housing. Although not shown, it is a matter of course that the spacer 81 has a through hole penetrating in the radial direction constituting a part of the oil return passage.

  According to the plummer block of the above embodiment, the first chamber 97 side end of the oil return passage 100 of the housing is open above the lubricating oil 96 on the inner surface of the first chamber 97. Regardless of the internal pressure, the lubricating oil 96 hardly flows back from the first chamber 97 to the second chamber 98 via the oil return passage 100. Accordingly, the amount of the lubricating oil 96 in the second chamber 98 does not increase even if the pressure in the first chamber 97 rises, and leaks to the outside of the lubricating oil 96 based on the rise in the pressure in the first chamber 97. Will not occur. Therefore, the amount of the lubricating oil 96 that leaks to the outside can be reduced.

  Further, according to the plummer block of the above embodiment, one end of the housing opens above the opening of the oil return passage 100 on the inner surface of the first chamber 97, while the other end of the housing opens on the inner surface of the second chamber 98. Since the air conduction hole 99 opened above the opening of the return passage 100 is provided, the atmospheric pressure in the first chamber 97 can be made substantially the same as the atmospheric pressure in the second chamber 98. Therefore, the lubricating oil in the first chamber 97 does not move to the second chamber 98 via the oil return passage 100 due to the pressure in the first chamber 97 being higher than the pressure in the second chamber 98. Further, the flow of oil that moves from the second chamber 98 to the first chamber 97 via the oil return passage 100 is not obstructed. Therefore, the amount of the lubricating oil 96 that leaks to the outside can be further reduced.

  Further, according to the plummer block of the above embodiment, since the cross-sectional area of the air conduction hole 99 is larger than the cross-sectional area of the oil return passage 100, the air conduction hole 99 is not easily clogged with the lubricating oil 96 or foreign matter. Therefore, it can be suppressed that the air conduction hole 99 does not perform the pressure adjustment effect due to clogging of foreign matters such as lubricating oil.

  Further, according to the plummer block of the above embodiment, since the length of the air conduction hole 99 in the extending direction is shorter than the length of the oil return passage 100 in the extending direction, the air conduction hole 99 is not easily clogged with foreign substances. Therefore, it can be further suppressed that the air conduction hole 99 does not perform the pressure adjustment effect due to the clogging of foreign matter.

  In the plummer block of the above embodiment, the rolling bearing is a self-aligning roller bearing in which the convex rollers 33 and 34 are arranged in two rows in the axial direction. However, in the rolling bearing device of the present invention, The rolling bearing may be a rolling bearing having rolling elements other than convex rollers such as balls, cylindrical rollers, and tapered rollers. In the rolling bearing device of the present invention, the rolling bearings may have rolling elements arranged in a single row or in two or more rows. In the rolling bearing device of the present invention, the rolling bearing may not be an adapter sleeve and may be a rolling bearing having a centering function, or may be a rolling bearing having a centering ring. . In short, the rolling bearing device of the present invention may have any rolling bearing.

  In the plummer block of the above embodiment, as shown in FIG. 2, the oil return passage has a substantially T-shaped cross section. However, in the rolling bearing device of the present invention, the oil return passage has any shape. It may be a shape. In short, the oil return passage only needs to have one end opened above the lubricating oil on the inner surface of the first chamber and the other end opened on the inner surface of the second chamber.

  Further, in the plummer block of the above-described embodiment, both the first sealing device 53 and the second sealing device 64 are sealing devices that do not have a cored bar portion. However, in the present invention, the first sealing device and the second sealing device are the same. At least one of the sealing devices may be a sealing device having a cored bar portion.

  Further, in the plummer block of the above embodiment, the length in the extending direction of the air conduction hole 99 is shorter than the length in the extending direction of the oil return passage 100. In the rolling bearing device of the present invention, The length in the extending direction of the air conduction hole may be the same as the length in the extending direction of the oil return passage, and the length in the extending direction of the air conduction hole is the extension direction of the oil return passage. It may be longer than the length of.

  Further, in the plummer block of the above embodiment, only one oil return passage and only one air conduction hole existed in each of one end and the other end in the axial direction. In this rolling bearing device, two or more oil return passages may exist at one end and the other end in the axial direction, and two or more air conduction holes may exist. When at least one of the oil return passage and the air conduction hole is present in two or more, the cross section is the largest in the one or more oil return passages among the one or more air conduction holes. It is a prerequisite that at least one air conduction hole having a cross section larger than that in the oil return passage must be present.

  In the above embodiment, the rolling bearing device is a plummer block. However, in this invention, the rolling bearing device may be a rolling bearing device other than the plummer block, such as an oil bath lubricated rolling bearing device of a rotating electrical machine. good. In short, the rolling bearing device of the present invention is any device as long as it has a shaft member, a housing, and a rolling bearing and has a specified oil return passage and a specified air conduction hole. good.

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Shaft box 3 Spherical roller bearing 4 1st sealing part 5 2nd sealing part 21 Upper shaft box division body 22 Lower shaft box division | segmentation pair 31 Outer ring 32 Inner ring 33 1st convex roller 34 2nd convex roller 53 1st 1 sealing device 54 second sealing device 80, 81 spacer 85 through hole in lower shaft box divided body 88 through hole in spacer 96 lubricating oil 97 first chamber 98 second chamber 99 air conduction hole 100 oil return passage

Claims (2)

A housing having an inner peripheral surface;
A shaft member having an outer peripheral surface;
A rolling bearing having an outer ring fitted on the inner circumferential surface of the housing, an inner ring fitted on the outer circumferential surface of the shaft member, and a rolling element disposed between the outer ring and the inner ring; ,
A first sealing device for sealing between the housing and the shaft member on one axial side of the shaft member;
A second sealing device that seals between the housing and the shaft member on one side in the axial direction, and is positioned outward in the axial direction from the first sealing device;
A first chamber located on the opposite side of the first sealing device in the axial direction from the second sealing device between the housing and the shaft member;
A second chamber surrounded by the housing, the shaft member, the first sealing device, and the second sealing device;
A lubricating oil provided in a lubricating oil reservoir in the lower part of the first chamber,
The housing is
An oil return passage having one end opened above the lubricating oil on the inner surface of the first chamber and the other end opened on the inner surface of the second chamber;
An air conduction hole having one end opened above the opening of the oil return passage on the inner surface of the first chamber and the other end opened above the opening of the oil return passage on the inner surface of the second chamber. Have
The rolling bearing device according to claim 1, wherein a cross-sectional area of the air conduction hole is larger than a cross-sectional area of the oil return passage. The rolling bearing device according to claim 1,
The rolling bearing device according to claim 1, wherein the length of the air conduction hole in the extending direction is shorter than the length of the oil return passage in the extending direction.

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