JP2013044374A - Tapered roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tapered roller bearing capable of surely preventing metal contact between a tapered roller 5 and an inner ring raceway surface 4 and between the tapered roller 5 and an outer ring raceway surface 3 in conveyance and in transport, and easily performing, without trouble, the removal work of a member for preventing metal contact between the tapered roller 5 and the inner ring raceway surface 4 and between the tapered roller 5 and the outer ring raceway surface 3 after transport even in the tapered roller bearing using a segment type cage 6.SOLUTION: Elastic string materials 11a-11h are circumferentially arranged between respective raceway surfaces 4, 3 of inner rings 2A, 2B and outer rings 3, and tapered rollers 5. The elastic string materials 11a-11h prevent contact between the respective raceway surfaces 4, 3 of the inner rings 2A, 2B and the outer rings 3, and the tapered rollers 5 in a state before use, and are extracted in use.

Description

  The present invention relates to a tapered roller bearing, and more particularly to prevention of damage to an inner ring raceway, an outer ring raceway, a rolling element and the like during transportation of the tapered roller bearing.

  Large tapered roller bearings used in large equipment such as mining machinery, construction machinery, papermaking machinery, wind power generators, etc., have a large mass, so when transported in an assembled state, the tapered rollers are placed on the inner ring raceway surface and outer ring raceway surface. It is known that, when an impact is received in a sandwiched state, indentations are generated at these contact portions, and fretting wear is generated by repeated vibration.

  In order to avoid the above problems, conventionally, segment-shaped cages in which inner rings, outer rings, and tapered rollers are assembled are separately packed and transported.

  However, when these parts are packaged and transported separately, it is necessary for the customer side to assemble these parts, which is troublesome and may lead to mistakes such as damage to the parts and misconfiguration.

  Patent Document 1 discloses a technique for fitting a damage-preventing separator between the inner and outer rings in order to solve the above-mentioned problem of indentation or fretting wear and to enable transportation with the bearing assembled.

JP 2006-90357 A

  As described above, even if a damage prevention separator is fitted between the inner and outer rings, the conical rollers and inner ring raceway surface, and the tapered rollers and outer ring raceway surface cannot avoid metal contact during transportation or transportation. And damage such as fretting wear may occur.

  In addition, when the cage is composed of a plurality of segment-type cages with tapered rollers built in, the segment-type cage unit is provided between the tapered rollers and the inner ring raceway surface, and between the tapered rollers and the outer ring raceway surface. In order to avoid the metal contact, a buffer sheet can be interposed between the tapered roller and the inner ring raceway surface, and between the tapered roller and the outer ring raceway surface.

  However, if a buffer sheet is interposed in units of segment-type cages, it is necessary to remove the buffer sheets while shifting them in the circumferential direction in units of cages when opening and using the packaging. There was a problem that it took time and effort.

  Therefore, the present invention reliably prevents metal contact between the tapered roller and the inner ring raceway surface, the tapered roller and the outer ring raceway surface during transportation and transportation, and also in the tapered roller bearing using the segment type cage, It is an object of the present invention to provide a tapered roller bearing capable of easily and easily removing a member for preventing metal contact between a tapered roller and an inner ring raceway surface and between a tapered roller and an outer ring raceway surface after transportation.

  In order to solve the above problems, a tapered roller bearing according to the present invention is a tapered roller bearing comprising an inner ring, an outer ring facing the inner ring, and a tapered roller interposed between the raceway surfaces of the inner ring and the outer ring. The elastic string material is disposed in the circumferential direction between each raceway surface of the outer ring and the tapered roller, and the elastic string material prevents contact between each raceway surface of the inner ring and the outer ring and the tapered roller in a state before use. It is designed to be pulled out during use.

  The material of the elastic string material is an elastic body such as nitrile rubber, nylon, polyurethane, etc. Even if the inner ring and the outer ring are fastened by a fastening member and deformed in the packed state before use, each raceway surface and tapered roller of the inner ring and the outer ring It is set to the cross-sectional diameter or thickness which has a clearance gap between them.

  According to the present invention, the fretting wear does not occur when the taper roller and the raceway surface are in direct metal contact with the elastic string material during transportation and transportation, and are subjected to repeated vibrations due to the buffering action of the elastic string material. Since it does not occur, damage to parts can be effectively prevented.

  In addition, when using a segment type cage that contains tapered rollers, it is not necessary to remove the segment type cage by removing the elastic string material from the end, so the work efficiency is extremely good. It is.

It is sectional drawing of the tapered roller bearing of Embodiment 1. It is sectional drawing which shows the state which has arrange | positioned elastic string material 11a, 11b to 2 A of inner rings. FIG. 3 is a cross-sectional view showing a state in which a tapered roller 5 and a cage 6 are arranged on the inner ring 2 </ b> A in the state of FIG. 2, and two elastic string materials 11 c and 11 d are arranged on the outer diameter surface of the tapered roller 5. FIG. 4 is a cross-sectional view showing a state where the outer ring 1 is dropped into the inner ring 2A of FIG. 3 from the upper surface side and the inner ring 2A and the outer ring 1 are fastened by the fastening jig 12. It is sectional drawing which shows the state which has arrange | positioned the elastic string material 11e and 11f to the inner ring | wheel 2B. FIG. 6 is a cross-sectional view showing a state in which the tapered roller 5 and the cage 6 are arranged on the inner ring 2 </ b> B in the state of FIG. 5, and two elastic string materials 11 g and 11 h are arranged on the outer diameter surface of the tapered roller 5. FIG. 7 is a cross-sectional view showing a state in which an inner ring 2A and an outer ring 1 fastened by a fastening jig 12 are reversed and dropped into an inner ring 2B incorporated in the state shown in FIG. 6 from the upper side. It is sectional drawing which shows the state which fastened two sets of inner ring | wheel 2A, 2B and the one outer ring | wheel 1 by the fastening jig | tool 12 in the state which located the inner ring | wheel 2B in the lower part side. It is the top view which looked at FIG. 8 from the direction of arrow Y. FIG. 9 is a plan view of FIG. 8 viewed from the direction of arrow Z. It is sectional drawing which shows the state which fastened two sets of inner ring | wheel 2A, 2B and the one outer ring | wheel 1 integrally with the fastening jig | tool 12 in the state which located the inner ring | wheel 2A in the lower part side. It is sectional drawing which shows the state which removed the fastening jig | tool 12 which fastens the inner ring | wheel 2A and the outer ring | wheel 1 from the state of FIG. The inner ring 2B and the outer ring 1 fastened by the fastening jig 12 are lifted from the state of FIG. 11, and elastic string materials 11c and 11d between the raceway surface 3 of the outer ring 1 and the tapered roller 5 of the inner ring 2A, and the raceway surface 4 of the inner ring 2A. It is sectional drawing which shows the state which pulled out 11a and 11b between the tapered rollers 5 sequentially. It is sectional drawing which shows the state which suspended the inner ring | wheel 2B and the outer ring | wheel 1 in the state which the inner ring | wheel 2B and the outer ring | wheel 1 were fastened by the fastening jig | tool 12 from the state of FIG. It is sectional drawing which shows the state which fastened the inner ring | wheel 2A and the outer ring | wheel 1 with the fastening jig | tool 12 from the state of FIG. 13, and reversed with the fastening state. It is sectional drawing which shows the state which removed the fastening member 12 of the inner ring | wheel 2B and the outer ring | wheel 1 from the state of FIG. With the inner ring 2A and the outer ring 1 being fastened from the state of FIG. 15, the inner ring 2A and the outer ring 1 are lifted upward, and elastic string materials 11g and 11h between the outer ring raceway surface 3 and the tapered roller 5 of the inner ring 2B, and the inner ring 2B It is sectional drawing which shows the state which pulled out the elastic string material 11e and 11f between the inner ring raceway surface 4 and the tapered roller 5. FIG. It is sectional drawing which shows the state which hung down the outer ring | wheel 1 and the inner ring | wheel 2A in the fastening state from the state of FIG. It is sectional drawing which shows the state which fastened the outer ring | wheel 1 and the inner ring | wheel 2B with the fastening jig | tool 12 from the state of FIG. 17, and removed all the elastic cord materials 11a-11h.

  This invention is applicable to any of single-row tapered roller bearings, combined tapered roller bearings (back-to-back, front-to-back), and double-row tapered roller bearings (inward; inner ring double row, outward: outer ring double row). In the following, an embodiment applied to a large double-row outward tapered roller bearing will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the tapered roller bearing according to the first embodiment includes one double row outer ring 1, two sets of inner rings 2 </ b> A and 2 </ b> B, and an inner ring 2 </ b> A facing the double row outer ring raceway surface 3 of the outer ring 1, The tapered roller 5 is interposed between the inner ring raceway surfaces 2B of the 2B, and the cage 6 holds the tapered roller 5 at a constant interval.

  The cage 6 is composed of a plurality of segments divided and arranged in an annular shape around the inner ring raceway surface 4. The divided segment type cage 6 is formed in a rectangular frame shape that is long in the circumferential direction, and a plurality of pockets are formed between the pillars provided in parallel between the long sides. Tapered roller 5 is accommodated.

  The inner rings 2A and 2B are formed with a large collar 8 on the large diameter side of the inner ring raceway surface 4 and a small collar 9 on the small diameter side, and the large collar 8 and the small collar 9 guide the rolling of the tapered roller 5. ing. The inner rings 2 </ b> A and 2 </ b> B are arranged so that the side of the gavel 9 faces each other via the spacer 10.

  Since the tapered roller bearing is large and has a large mass, the tapered roller 5 and the inner ring raceway surface 4 and the tapered roller 5 and the outer ring raceway surface 3 may be damaged by metal contact due to vibration during transportation or transportation. There is.

  For this reason, in this invention, the taper roller bearing is provided with the following packing means to prevent damage during transportation and transportation.

  The packing means of the tapered roller bearing to which this invention is applied is as follows.

  In the state before the outer ring 1 is assembled, first, as shown in FIG. 2, one inner ring 2A of the two sets of inner rings 2A and 2B is horizontally placed such that the large collar 8 is positioned on the lower surface side. Two elastic string materials 11a and 11b are arranged on the inner ring raceway surface 4 of the placed inner ring 2A along the inner ring raceway surface 4 along the entire circumference.

  The elastic string materials 11a and 11b are formed of an elastic material such as nitrile rubber, nylon, and polyurethane, and are formed in a ring shape or a string shape with an end portion cut off.

  As will be described later, the elastic string materials 11a and 11b can be obtained by deforming the outer ring 1 and the two sets of inner rings 2A and 2B by applying a fastening load by the fastening jig 12 and deforming the outer ring raceway surface 3 of the outer ring 1. In order to prevent the tapered rollers 5 and the inner ring raceway surfaces 4 of the inner rings 2A and 2B from coming into direct contact with the tapered rollers 5, the sectional diameter or thickness is formed to be at least 1 mm, and the sectional diameter or thickness is at least about 50% after deformation. I try to keep it. The cross-sectional shape of the elastic string materials 11a and 11b may be round, square or flat.

  Next, as shown in FIG. 3, the segment-shaped cage 6 in which the tapered rollers 5 are accommodated in the pockets is attached to the inner ring 2A in which the elastic string materials 11a and 11b are arranged, on the inner ring raceway surface 4 of the inner ring 2A. Two elastic string materials 11c and 11d are arranged on the outer diameter surface of the tapered roller 5 incorporated in the entire circumference and incorporated in the inner ring 2A.

  Then, as shown in FIG. 4, the outer ring 1 is dropped from the upper surface side, and the inner ring 2 </ b> A and the outer ring 1 are fastened by the fastening jig 12.

  The fastening jig 12 includes a fixing plate 14 that is fixed to the lower surface of the inner ring 2 </ b> A by a bolt 13, and a fastening bolt 15 that fastens the fixing plate 14 and the outer ring 1. The fastening bolt 15 is disposed so as to penetrate the outer ring 1, and a spacer 16 is disposed between the fixing plate 14 and the outer ring 1.

  Next, as shown in FIG. 5, the other inner ring 2B of the two sets of inner rings 2A and 2B is horizontally placed such that the large collar 8 is located on the lower surface side, and the inner ring raceway of the horizontally placed inner ring 2B. Two elastic string materials 11 e and 11 f are arranged on the surface 4 along the inner ring raceway surface 4 on the entire circumference.

  Next, as shown in FIG. 6, the segment-shaped cage 6 in which the tapered rollers 5 are accommodated in the pockets is attached to the inner ring 2B in which the elastic string materials 11e and 11f are arranged, and the entire inner ring raceway surface 4 of the inner ring 2B. Two elastic string materials 11g and 11h are arranged on the outer diameter surface of the tapered roller 5 incorporated in the circumference and incorporated in the inner ring 2B.

  Then, the inner ring 2A and the outer ring 1 fastened by the fastening jig 12 are reversed as shown in FIG. 7, and dropped into the inner ring 2B assembled in the state shown in FIG. 6 from the upper side.

  Thereafter, when the inner ring 2B and the outer ring 1 are fastened by the fastening jig 12, the two sets of inner rings 2A and 2B and one outer ring 1 are integrated with each other in a state where the inner ring 2B is positioned on the lower side as shown in FIG. In the fastened state, the tapered roller 5 and the inner ring raceway surface 4, and the tapered roller 5 and the outer ring raceway surface 3 are not in direct metal contact with the elastic cord material 11a to 11h, and the elastic cord material 11a to 11h. Due to the buffering action, fretting wear does not occur even when it is repeatedly subjected to vibration during transportation and transportation, so that damage to parts can be effectively prevented.

  As shown in FIGS. 9A and 9B, the fastening jigs 12 for fastening the inner rings 2A, 2B and the outer ring 1 are provided equally at three locations on the inner ring 2A side and the inner ring 2B side. 9A is a view as viewed from the Y direction of FIG. 8 in a state of being fastened as shown in FIG. 8, and FIG. 9B is a view as viewed from the Z direction of FIG. 8, and shows the inner ring 2A side and the inner ring 2B side. Thus, the fastening jig 12 is provided by being shifted by 60 degrees.

  Next, when the consumer opens and uses the tapered roller bearing that is fastened and packed by the fastening jig 12 as described above, the tapered roller 5 and the inner ring raceway surface 4, And the elastic string materials 11a-11h arrange | positioned between the tapered roller 5 and the outer ring raceway surface 3 are pulled out.

  By pulling out the elastic string materials 11a to 11h, a tapered roller bearing in an assembled state can be obtained. Thus, assembling on the consumer side can be saved as in the case where each part is individually packed and transported and transported. At the same time, it is possible to prevent mistakes such as damage to parts and wrong assembly during assembly.

  In the above embodiment, two elastic string materials 11a to 11h are arranged for each raceway surface. However, two or more elastic string materials may be used, and metal contact between the raceway surface and the tapered roller 5 can be prevented. If you can, just one.

  Hereinafter, the procedure for pulling out the elastic string materials 11a to 11h will be described from the state in which the inner ring 2A is on the lower side in the fastened state as shown in FIG.

  First, as shown in FIG. 11, the fastening jig 12 for fastening the inner ring 2A and the outer ring 1 is removed.

  In the state shown in FIG. 11, the inner ring 2 </ b> B and the outer ring 1 are fastened by the fastening jig 12. From this state, as shown in FIG. 12, the inner ring 2 </ b> B and the outer ring 1 fastened by the fastening jig 12. Are lifted upward by several millimeters, and elastic string materials 11c and 11d between the raceway surface 3 of the outer ring 1 and the tapered roller 5 of the inner ring 2A, and 11a and 11b between the raceway surface 4 of the inner ring 2A and the tapered roller 5 are sequentially pulled out. .

  The elastic string materials 11a to 11d are pulled out from the end when the elastic string materials 11a to 11d are in the shape of a string with an end, and if the elastic string materials 11a to 11d are in a ring shape, the elastic string material 11a to 11d is one of the ring shapes. By cutting the place, draw it into a string shape.

  Thereafter, the inner ring 2B and the outer ring 1 are suspended while the inner ring 2B and the outer ring 1 are fastened by the fastening jig 12 as shown in FIG. 13, and the inner ring 2A and the outer ring 1 are fastened as shown in FIG. Fastened by the jig 12 and reversed in the fastened state. In this state, the inner ring 2B is located on the lower surface side.

  Next, as shown in FIG. 15, the fastening members 12 of the inner ring 2B and the outer ring 1 are removed.

  Thereafter, as shown in FIG. 16, the inner ring 2A and the outer ring 1 are kept fastened while the inner ring 2A and the outer ring 1 are lifted upward by several millimeters, and an elastic string material between the outer ring raceway surface 3 of the inner ring 2B and the tapered roller 5 is used. 11g and 11h, and elastic string materials 11e and 11f between the inner ring raceway surface 4 of the inner ring 2B and the tapered rollers 5 are sequentially pulled out.

  Thereafter, as shown in FIG. 17, the outer ring 1 and the inner ring 2A are suspended while being fastened.

  Then, as shown in FIG. 18, the outer ring 1 and the inner ring 2 </ b> B are fastened by the fastening jig 12, whereby all the removal work of the elastic cord materials 11 a to 11 h is completed.

  Thereafter, the tapered roller bearing from which all of the elastic string materials 11a to 11h have been removed is assembled according to the convenience of the mating member to be used.

  As described above, according to the present invention, since the elastic string materials 11a to 11h can be pulled out from the end portion, the segment-shaped cage 6 in which the tapered rollers 5 are housed is sequentially removed, so that the transport / transport can be performed. At this time, it is not necessary to remove the buffer sheets laid between the raceway surfaces of the inner ring and the outer ring and the tapered rollers, and the working efficiency is extremely good.

DESCRIPTION OF SYMBOLS 1 Outer ring 2A, 2B Inner ring 3 Outer ring raceway surface 4 Inner ring raceway surface 5 Tapered roller 6 Cage 8 Large bush 9 Small rod 10 Spacer 11a-11h Elastic string material 12 Fastening jig 13 Bolt 14 Fixing plate 15 Fastening bolt 16 Spacer

Claims (10)

  In a tapered roller bearing comprising an inner ring, an outer ring facing the inner ring, and a tapered roller interposed on each raceway surface of the inner ring and the outer ring, an elastic string material is circumferentially disposed between each raceway surface of the inner ring and the outer ring and the tapered roller. A tapered roller bearing, wherein the elastic string material is pulled out during use, preventing contact between each raceway surface of the inner ring and outer ring and the tapered roller in a state before use.   The tapered roller bearing according to claim 1, wherein the cage includes a plurality of segments in which tapered rollers are incorporated.   The tapered roller bearing according to claim 1 or 2, wherein the elastic string material is arranged over the entire circumference of each raceway surface of the inner ring and the outer ring.   The tapered roller bearing according to claim 3, wherein the elastic string material is formed in a ring shape.   The tapered roller bearing according to any one of claims 1 to 4, wherein a plurality of elastic string materials are arranged on each raceway surface of the inner ring and the outer ring.   The tapered roller bearing according to any one of claims 1 to 5, wherein the elastic string material has a round, square, or flat cross-sectional shape and a cross-sectional diameter or thickness of at least 1 mm.   The tapered roller bearing according to any one of claims 1 to 6, wherein the elastic string material is an elastic body such as nitrile rubber, nylon, or polyurethane.   The elastic string material has a gap between each raceway surface of the inner ring and the outer ring and the tapered roller even when the elastic ring material is deformed in a packing state before use in which the inner ring and the outer ring are fastened by the fastening member. Tapered roller bearings described in 1.   The elastic string material is made of an elastic body that retains at least 50% of the cross-sectional diameter or thickness before fastening in a packed state before use in which the inner ring and the outer ring are fastened by a fastening member. Tapered roller bearings.   The tapered roller bearing according to any one of claims 1 to 9, wherein the tapered roller bearing is used for a large-sized device such as a mining machine, a construction machine, a papermaking machine, or a wind power generator.

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