JP2008095895A - Conical roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conical roller bearing with an extended life which hardly causes seizure. <P>SOLUTION: A first inner ring 5 includes a lubricant supply port 30 axially communicating with a space enclosed by a radial extension part 61 of a retainer 25 and a minor diameter end surface 90 of a conical roller 8, and opened to the outer circumferential surface of a small collar part 60. A second inner ring 6 includes a lubricant supply port 31 axially communicating with a space enclosed by a radial extension part 81 of a retainer 28 and a minor diameter end surface 91 of a conical roller 11, and opened to the outer circumferential surface of a small collar part 70. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tapered roller bearing, and more particularly to a tapered roller bearing suitable for use in a V roll of a rolling mill (a work roll disposed so that its axial direction is substantially parallel to the vertical direction).

  Conventional tapered roller bearings include those described in Japanese Patent Publication No. 61-12130 (Patent Document 1).

  This tapered roller bearing forms part of a work roll of a rolling mill. The tapered roller bearing has an inner ring, an outer ring, and a tapered roller. The outer ring has a conical track surface. The inner ring has a conical raceway surface, a small collar portion located on the small diameter side of the conical raceway surface, and a large collar portion located on the large diameter side of the conical raceway surface. A plurality of the tapered rollers are arranged between the conical raceway surface of the inner ring and the conical raceway surface of the outer ring with a predetermined interval in the circumferential direction while being held by a cage.

  The cage includes a conical main body and a radially extending portion. The main body has a pocket for accommodating the tapered rollers, and has an inner diameter that decreases toward the end surface of the inner ring in the axial direction of the small collar. On the other hand, the radially extending portion is continuous with the main body portion in the axial direction and extends substantially in the radial direction.

  The inner ring has a greasing hole. The said greasing hole is opening in the outer part of an axial direction rather than the said radial direction extension part of the holder | retainer in the outer peripheral surface of an inner ring.

In such a background, there is a demand for suppressing the seizure of the tapered roller bearing used for the work roll of the rolling mill and extending the life.
Japanese Examined Patent Publication No. 61-12130

  Accordingly, an object of the present invention is to provide a tapered roller bearing that is difficult to seize and has a long life.

In order to solve this problem, the tapered roller bearing of the present invention is
An inner ring having a conical raceway surface, a small collar portion located on the small diameter side of the conical raceway surface, and a large collar portion located on the large diameter side of the conical raceway surface;
An outer ring having a conical raceway surface;
A tapered roller disposed between the conical raceway surface of the inner ring and the conical raceway surface of the outer ring;
A conical main body having a pocket for accommodating the tapered rollers, and a cage having a radially extending portion that extends in the axial direction and extends in the axial direction to the main body;
The inner ring communicates with a space surrounded by the radially extending portion and the small-diameter end surface of the tapered roller in the axial direction, and has a lubricant supply hole that opens on the outer peripheral surface of the small flange portion. It is characterized by being.

  “Extends in a substantially radial direction” means a state in which at least a radially extending component is provided. Therefore, it may be extended in a state having an axially extending component.

  In the tapered roller bearing having the above-described conventional configuration, the inventor opens the grease supply hole in an outer portion of the inner ring in the axial direction than the radially extending portion of the cage. , The cage prevents oil from entering inward in the axial direction, and the oil contacts the rolling contact portion between the tapered roller rolling surface and the conical raceway surface, and the sliding contact portion between the tapered roller end surface and the flange surface. It has been found that it is difficult to supply to a conical orbital surface or a large ridge surface. In particular, when this tapered roller bearing is disposed in a V-roll of a rolling mill, the flow of oil to the rolling contact portion between the tapered roller rolling surface and the conical raceway surface, the oil tapered roller end surface and the flange surface It has been found that the effect of obstructing the cage that obstructs the flow to the sliding contact portion with the roller increases.

  According to the present invention, the inner ring communicates with a space surrounded by the radially extending portion and the small-diameter end surface of the tapered roller in the axial direction, and the lubricant opens to the outer peripheral surface of the small flange portion. Since it has a supply hole, the flow of the lubricant that has flowed out from the outer peripheral surface of the small flange portion to the sliding portion of the bearing is not obstructed by the cage, and flows out from the outer peripheral surface of the small flange portion. The lubricant (grease, lubricating oil) is applied to the rolling contact portion between the tapered roller rolling surface and the conical raceway surface, and the sliding contact portion between the tapered roller end surface and the saddle surface (conical raceway surface or large collar portion). Etc.) can be supplied smoothly and efficiently.

  In particular, when this tapered roller bearing is arranged in a V-roll of a rolling mill, when the end surface on the small collar portion side of the inner ring is positioned vertically above the end surface on the large collar side, the tapered roller bearing Since the central axis is parallel to the substantially vertical direction, the lubricant that has flowed out from the outer peripheral surface of the small collar portion automatically moves to the large collar side below the vertical direction by gravity. Therefore, the lubricant can be efficiently and automatically supplied to the small-diameter end surface of the tapered roller and the sliding surface of the large collar portion of the inner ring, thereby suppressing seizure of the sliding contact portion between the tapered roller end surface and the collar surface. The effect to do becomes large. Therefore, the lifetime of the tapered roller bearing can be extended.

  According to the tapered roller bearing of the present invention, the flow of the lubricant that has flowed out from the outer peripheral surface of the small flange portion to the sliding portion is not obstructed by the retainer, and therefore has flowed out from the outer peripheral surface of the small flange portion. Lubricant (grease, lubricating oil) is applied to the rolling contact portion between the tapered roller rolling surface and the conical raceway surface in the bearing, and the sliding contact portion between the tapered roller end surface and the saddle surface (cone raceway surface or large collar part). Surface and the like) can be supplied smoothly and efficiently.

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

  FIG. 1 is a sectional view in the axial direction of a tapered roller bearing according to an embodiment of the present invention.

  The tapered roller bearing forms a part of a V roll (work roll disposed so that the axial direction is substantially parallel to the substantially vertical direction) of the rolling mill. The tapered roller bearing is disposed between a roll neck (not shown) of a V roll and a cylindrical housing (not shown). The tapered roller bearing is in a state in which the central axis of the tapered roller bearing substantially coincides with the vertical direction in the movable state of the tapered roller bearing. In FIG. 1, an arrow A indicates the upper part in the vertical direction. In the following description, the case where the end portion on one side in the axial direction of the tapered roller bearing indicated by the arrow a in FIG. 1 is disposed above in the vertical direction will be described.

  The tapered roller bearing includes a first outer ring 1, a second outer ring 2, a third outer ring 3, a first inner ring 5, a second inner ring 6, a first tapered roller 8, a second tapered roller 9, a third tapered roller 10, A four tapered roller 11, a first sealing device 13, and a second sealing device 14 are provided.

  The first outer ring 1 has a second conical raceway surface 35 and a third conical raceway surface 36 which are two conical raceway surfaces adjacent in the axial direction, while the second outer ring 2 has one conical raceway surface. The third outer ring 3 has a fourth conical raceway surface 38 which is one conical raceway surface. An annular outer ring spacer 20 is disposed between the first outer ring 1 and the second outer ring 2 in the axial direction, and between the first outer ring 1 and the third outer ring 3 in the axial direction. An annular outer ring spacer 21 is arranged. The first to third outer rings 1, 2, and 3 are shrink fitted on the inner peripheral surface of a cylindrical housing (not shown).

  On the other hand, the first inner ring 5 has a fifth conical raceway surface 45 and a sixth conical raceway surface 46 which are two conical raceway surfaces adjacent in the axial direction, and the second inner ring 6 is adjacent to the axial direction 2. A seventh conical orbit surface 47 and an eighth conical orbit surface 48 are provided. An annular inner ring spacer 22 is arranged between the first inner ring 5 and the second inner ring 6 in the axial direction.

  The first tapered roller 8 is held by the first retainer 25 between the first conical raceway surface 37 of the second outer ring 2 and the fifth conical raceway surface 45 of the first inner ring 5. A plurality are arranged at predetermined intervals in the direction. The second tapered roller 9 is held by the second retainer 26 between the second conical raceway surface 35 of the first outer ring 1 and the sixth conical raceway surface 46 of the first inner ring 5. A plurality are arranged at predetermined intervals in the direction. The third tapered roller 10 is held by the third cage 27 between the third conical raceway surface 36 of the first outer ring 1 and the seventh conical raceway surface 47 of the second inner ring 6. A plurality are arranged at predetermined intervals in the direction. The fourth tapered roller 11 is held by the fourth cage 28 between the fourth conical raceway surface 38 of the third outer ring 3 and the eighth conical raceway surface 48 of the second inner ring 6. A plurality are arranged at predetermined intervals in the direction.

  The fifth conical track surface 45 of the first inner ring 5 is located on the outermost side on the other side in the axial direction. The outer diameter of the fifth conical track surface 45 decreases as it goes outward in the axial direction. The first inner ring 5 has a small flange portion 60 on the outer side in the axial direction of the fifth conical track surface 45, and a large flange portion 61 on the inner side in the axial direction of the fifth conical track surface 45.

  On the other hand, the eighth conical track surface 48 of the second inner ring 6 is located on the outermost side on one side in the axial direction. The outer diameter of the eighth conical orbital surface 48 decreases as it goes outward in the axial direction. The second inner ring 6 has a small flange portion 70 on the outer side in the axial direction of the eighth conical track surface 48, and a large flange portion 71 on the inner side in the axial direction of the eighth conical track surface 48.

  The first cage 25 is located on the outermost side on the other side in the axial direction. The first cage 25 includes a conical main body 50 and a radially extending portion 51. The inner diameter of the main body 50 decreases as it goes outward in the axial direction. The radially extending portion 51 is connected to the main body portion 50. The radially extending portion 51 is located on the other side in the axial direction of the main body portion 50 and extends substantially in the radial direction.

  On the other hand, the fourth cage 28 is located on the outermost side on the one side in the axial direction. The fourth cage 28 includes a conical main body 80 and a radially extending portion 81. The inner diameter of the main body 80 decreases as it goes outward in the axial direction. The radial extending portion 81 is connected to the main body portion 80. The radially extending portion 81 is located on the one side in the axial direction of the main body portion 80 and extends substantially in the radial direction.

  The first inner ring 5 has a first lubricant supply hole 30 for supplying grease as an example of a lubricant into the tapered roller bearing. The first lubricant supply hole 30 extends in the radial direction and communicates between the inner peripheral surface of the first inner ring 5 and the outer peripheral surface of the first inner ring 5. On the outer peripheral side of the first inner ring 5, the first lubricant supply hole 30 has a radially extending portion 51 in the axial direction and a small-diameter end surface of the tapered roller 8 located on the outermost side on the other side in the axial direction. It communicates with the space surrounded by 90. The first lubricant supply hole 30 is open to the outer peripheral surface of the small collar portion 60. A plurality of the first lubricant supply holes 30 are formed in the first inner ring 5 at a predetermined interval in the circumferential direction.

  The second inner ring 6 has a second lubricant supply hole 31 for supplying grease into the tapered roller bearing. The second lubricant supply hole 31 extends in the radial direction and communicates between the inner peripheral surface of the second inner ring 6 and the outer peripheral surface of the second inner ring 6. On the outer peripheral side of the second inner ring 6, the second lubricant supply hole 31 includes a radially extending portion 81 in the axial direction and a small-diameter end surface of the tapered roller 11 located on the outermost side on the one side in the axial direction. It communicates with the space surrounded by 91. The second lubricant supply hole 31 opens on the outer peripheral surface of the small collar portion 70. A plurality of the second lubricant supply holes 31 are formed in the second inner ring 6 at a predetermined interval in the circumferential direction.

  The inner ring spacer 22 has a third lubricant supply hole 85 for supplying grease into the tapered roller bearing. The third lubricant supply hole 85 extends in the radial direction and communicates between the inner peripheral surface of the inner ring spacer 22 and the outer peripheral surface of the inner ring spacer 22.

  Although not described in detail, a lubricant supply passage (not shown) is formed in the roll neck to which the first inner ring 5 and the second inner ring 6 are fitted. In the state in which the end portion on one side in the axial direction of the tapered roller bearing indicated by the arrow a in FIG. 1 is disposed above the vertical direction, the first lubricant supply hole 30 communicates with the lubricant supply passage. On the other hand, the second lubricant supply hole 31 and the third lubricant supply hole 85 communicate with the lubricant supply groove. In this case, grease is supplied into the tapered roller bearing through the lubricant supply passage and the second lubricant supply hole 31, and the grease is conical through the lubricant supply passage and the third lubricant supply hole 85. It is supplied into the roller bearing. Thus, grease is supplied into the tapered roller bearing to lubricate the sliding portion of the tapered roller bearing.

  According to the tapered roller bearing of the above embodiment, the second inner ring 6 communicates with the space surrounded by the radially extending portion 81 and the small diameter end surface 91 of the tapered roller 11 in the axial direction, and Since the second lubricant supply hole 31 opened on the outer peripheral surface is provided, the grease flowing out from the outer peripheral surface of the gavel portion 70 to the sliding portion is not obstructed by the cage 28. The grease that has flowed out from the outer peripheral surface of the small flange portion 70 is the rolling contact portion between the tapered roller rolling surface and the conical raceway surface in the tapered roller bearing, and the sliding contact portion between the tapered roller end surface and the saddle surface (conical raceway surface). And can be supplied smoothly and efficiently.

  The tapered roller bearing is disposed on the V-roll of the rolling mill, the central axis of the tapered roller bearing is parallel to the substantially vertical direction, and the end surface of the second inner ring 6 on the side of the small flange portion 70. Is located above the vertical direction, the grease that has flowed out from the outer peripheral surface of the gavel portion 70 automatically moves downward in the vertical direction due to gravity. Therefore, the grease can be efficiently and automatically supplied to the small diameter end surface 91 of the tapered roller 11 and the flange surface of the large flange portion 71 of the second inner ring 6, and the sliding contact portion between the tapered roller end surface and the flange surface is baked. Sticking can be suppressed. Therefore, the lifetime of the tapered roller bearing can be extended.

  Specifically, in the tapered roller bearing, when grease is supplied from the second lubricant supply hole 31, the grease is mainly used for the small diameter end surface of the fourth tapered roller 11, the eighth conical raceway surface 48, and the eighth cone of the large collar portion 71. The grease supplied to the flange surface on the raceway surface 48 side is changed by the rolling of the fourth tapered roller 11 with respect to the second inner ring 6 and the rolling of the fourth tapered roller 11 with respect to the third outer ring 3. The rolling contact portion between the rolling surface of the tapered roller 11 and the eighth conical raceway surface 48 of the second inner ring 6, and the rolling surface of the fourth tapered roller 11 and the fourth conical raceway surface 38 of the third outer ring 3. Rolling contact portion, sliding contact portion between the small diameter end surface of the fourth tapered roller 11 and the flange surface of the small flange portion 70 of the second inner ring 6, large diameter end surface of the fourth tapered roller 11 and the second inner ring 6 Supplied to the sliding contact portion between the large collar portion 71 and the collar surface, and exerts a lubricating action. The grease supplied to the rolling contact portion and the sliding contact portion is scraped off by the rolling of the fourth tapered roller 11, and the large diameter end surface of the third tapered roller 10, the third conical track surface of the first outer ring 1, and the like. And is supplied to the rolling contact portion and the sliding contact portion of the third tapered roller 10 by the rolling of the third tapered roller 10, exerts a lubricating action, is further scraped off, and further rolls into contact with the tapered roller bearing below vertically. And the sliding contact portion.

  Further, according to the tapered roller bearing of the above embodiment, the first lubricant supply hole 30 and the second lubricant supply hole 31 are substantially plane-symmetric with respect to the vertical bisector of the central axis of the tapered roller bearing. Therefore, when the second inner ring 6 of the tapered roller bearing is arranged vertically above the first inner ring 5 as in the present embodiment, the second and third lubricant supply holes 31 and 85 are formed. When the first inner ring 5 of the tapered roller bearing is disposed vertically above the second inner ring 6, the first and third lubricant supply holes 30 and 85 can be provided. Thus, grease can be supplied into the tapered roller bearing.

  In the tapered roller bearing, both ends of the tapered roller bearing are surrounded by the radially extending portions 51 and 81 of the cages 25 and 28 and the small diameter end surfaces 90 and 91 of the tapered rollers 8 and 11 in the axial direction. Lubricant supply holes 30 and 31 that open to the space are formed, but in the present invention, the radial extension portion of the cage and the small diameter of the tapered roller in the axial direction are provided only at one axial end portion of the tapered roller bearing. A lubricant supply hole that opens in a space surrounded by the end surface may be formed. When a tapered roller bearing in which a lubricant supply hole is formed only at one end of the tapered roller bearing is disposed on the V-roll, the lubricant supply hole is formed at one end where the lubricant supply hole is formed. Needless to say, it is arranged vertically above the other end.

  In the above embodiment, the first sealing device 13 is provided on the other side in the axial direction and the second sealing device 14 is provided on one side in the axial direction. However, the sealing device may be provided only on one side in the axial direction or only on the other side in the axial direction. There is no need for a sealing device.

It is sectional drawing of the axial direction of the tapered roller bearing of one Embodiment of this invention.

Explanation of symbols

5 First Inner Ring 6 Second Inner Ring 8,11 Tapered Roller 25,28 Cage 30 First Lubricant Supply Hole 31 Second Lubricant Supply Hole 60,70 Gauge 50,80 Main Body 51,81 Radial Extension 90,91 Small diameter end face of tapered roller

Claims (1)

An inner ring having a conical raceway surface, a small collar portion located on the small diameter side of the conical raceway surface, and a large collar portion located on the large diameter side of the conical raceway surface;
An outer ring having a conical raceway surface;
A tapered roller disposed between the conical raceway surface of the inner ring and the conical raceway surface of the outer ring;
A conical main body having a pocket for accommodating the tapered rollers, and a cage having a radially extending portion that extends in the axial direction and extends in the axial direction to the main body;
The inner ring communicates with a space surrounded by the radially extending portion and the small-diameter end surface of the tapered roller in the axial direction, and has a lubricant supply hole that opens on the outer peripheral surface of the small flange portion. A tapered roller bearing.

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