JP2007218394A - Two-split bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a period of time for assembling a two-split bearing including: an inner race and an outer race split into two parts in the vertical direction; a roller with a cage interposed between the inner and outer races and split into two parts in the vertical direction; and other members incorporated between a shoulder of a shaft and a fixed member attached to a side of the shaft together with the inner race. <P>SOLUTION: A female screw 11 extending along the axial direction and a male thread 12 screwed into the female screw 11 are provided in a fastening race 8 on the side of the fixed member 9 which is incorporated between the shaft shoulder 2a and the fixed member 9 together with the inner race 3. By axially protruding the male thread 12 with respect to the female screw 11 in such a state that the inner race 3 and both the fastening races 8, 8' are incorporated between the shaft shoulder 2a and the fixed member 9, the width W1 of axial incorporation of the fastening race 8 on the side of the fixed member 9 is increased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a split bearing and is applied to, for example, a self-aligning roller bearing that supports a trunnion shaft of a converter in a steel production facility.

  A self-aligning roller bearing suitable for receiving vibration and impact load is used for the bearing portion of the trunnion shaft that supports the furnace body of the converter. The self-aligning roller bearing is often divided into two to facilitate repair and replacement.

  This split spherical roller bearing is generally divided into two vertically divided inner rings and outer rings, and the inner ring and the outer ring are divided into two vertically divided between the inner ring and the outer ring. Interposing a roller with a cage, fitting the upper and lower split rings on the outer diameter surfaces of the axial ends of the inner ring, connecting the two split rings and tightening the inner ring, The upper and lower divided bodies of the bearing box are integrally coupled by a tightening member, and seal members mounted on both axial ends of the inner diameter surface of the bearing box are in sliding contact with the outer diameter surface of the tightening ring. For example, Patent Document 1).

  In the above-mentioned Patent Document 1, in order to provide alignment, the raceway surface of the outer ring is formed into a spherical surface centered on the bearing center, and the roller is formed into a barrel shape along the spherical surface. The tightening ring tightens the inner ring by screwing the upper tightening ring and the lower tightening ring while being fitted to the inner ring. Therefore, a fastening ring is incorporated together with the inner ring between the shaft shoulder and the fixing member attached to the shaft side. In this state, the end of the corresponding tightening ring is located between the inner ring and the shaft shoulder, and between the inner ring and the fixing member, and the end of the tightening ring restricts the axial movement of the inner ring. It has become.

  The split bearings as described above are often used on the fixed side and it is preferable that there is no axial play (gap). However, considering productivity and cost, consider the dimensional tolerance of each part. Then, the axial backlash generated between the inner ring and the shaft shoulder and between the inner ring and the fixing member increases.

  Therefore, in the above-described split bearing of Patent Document 1, the shaft defined by the step portion with respect to the outer diameter surface of any one of the tightening rings assembled at both axial ends of the inner ring. A machining allowance portion having a predetermined width in the direction is provided. When such a machining allowance is provided, the axial distance between the shaft shoulder and the fixed member is measured before assembly of the bearing, and the machining allowance of the fastening ring is ground and dimensioned on site. Thus, the axial play can be reduced.

JP 2002-235754 A (refer to claim 3, paragraph number 0008, FIG. 2)

  However, in the above-mentioned split bearing of Patent Document 1, when the old bearing is removed and a new bearing is assembled after that, after measuring the axial distance between the shaft shoulder and the fixing member, the allowance for the clamping ring is removed on site. In order to grind parts, it was not possible to prepare a new bearing ring before removing the old bearing, and the construction period was long.

  In the above-mentioned Patent Document 1, since the outer diameter surface of the tightening ring is a sliding portion of the seal member provided in the bearing box, the work of fitting the lower tightening ring on the shaft shoulder side to the outer diameter surface of the lower inner ring is performed. In addition, it is necessary to carry out in a state where the shaft is largely floated upward so that the lower fastening ring and the seal member do not contact each other. For this reason, the work is complicated, and the gear mating portion provided at the shaft end is likely to come off, resulting in a prolonged construction period.

  Therefore, the subject of the present invention was attached to the inner ring and outer ring divided into two vertically, the rolling element with a cage divided into two vertically interposed between these inner and outer rings, and the shaft shoulder and the shaft side. It is to shorten the assembly period of the split bearing provided with a separate member incorporated together with the inner ring between the fixed member.

In order to achieve the above object, according to the present invention, at least one member of the inner ring and the separate member is provided with a female screw oriented in the axial direction and a male screw screwed to the female screw, and the inner ring and the separate member are provided. The male screw is protruded to one side in the axial direction with respect to the female screw in a state in which the member is assembled between the shaft shoulder and the fixing member, whereby the axial incorporation width of the one member is increased. Adopted.
Here, “axially built-in width” means an axial length occupied by the one member (including the female screw and the male screw) between the shaft shoulder and the fixing member.

  According to the above configuration, in the state where the axially integrated width of the one member is smaller than the maximum, it is assembled between the shaft shoulder and the fixing member, and then the male screw is protruded so that the male screw protrudes. Axial backlash generated between each of the shaft shoulder, the fixing member, the inner ring, and the separate member can be adjusted by increasing the axial incorporation width. Therefore, this invention can shorten the assembly period of a split bearing compared with the case where an attachment member is ground on-site.

  Specifically, the separate member is composed of a vertically divided clamping ring that is fitted to the outer diameter surfaces of both axial ends of the inner ring, and faces the fixing member on the fixing ring on the fixing member side. A configuration provided with the male screw and the male screw can be employed.

  Further, according to the configuration of the present invention, since the width of one member in the axial direction is increased, the side surface on the shaft shoulder side of the inner ring can be displaced to the shaft shoulder side using the propulsive force of the male screw. By utilizing this, the assembly period can be further shortened.

  For example, the outer ring, the inner ring, and the separate member are incorporated in a bearing box that is divided into two parts in the vertical direction, and the outer diameter surface of the tightening ring on the shaft shoulder side is provided on the shaft shoulder side seal member provided on the bearing box. When the male screw is protruded in an assembled state in which the shaft shoulder side tightening ring is separated from the fixing member side with respect to the seal member, the shaft shoulder side tightening ring is moved to the shaft shoulder side. If the structure is adopted in which the sliding part moves and contacts the sealing member, the sealing member and the sliding part can be formed by incorporating a fastening ring on the shaft shoulder side without causing the shaft to float upward, and then projecting the male screw. Can be brought into contact with each other, the work is simplified, and the assembly period can be further shortened.

Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the split bearing according to the first embodiment includes a bearing box 1, an inner ring 3 assembled on the outer periphery of the shaft 2, and a spherical raceway facing the double-row raceway surfaces 4 and 4. An outer ring 6 having a surface 5, a double row roller 7 with a cage interposed between the inner ring 3 and the raceway surfaces 4 and 5 of the outer ring 6, and a tightening ring 8 fitted to the outer periphery of both end portions in the axial direction of the inner ring 3. , 8 'and a self-aligning roller bearing.

  The bearing box 1 is divided into two divided bodies of an upper bearing box and a lower bearing box, and both parts are combined and integrated by fastening bolts.

  One end portion of the bearing box 1 in the axial direction is opened, and the lid member 1a is fixed to the open portion by a bolt. Further, seal members 1b and 1b are provided at both ends of the bearing housing 1 in the axial direction.

  The inner ring 3 is divided into an upper inner ring and a lower inner ring, and both inner rings are provided with fitting portions 3a and 3a projecting in the axial direction at both ends, and each fitting portion 3a. A fitting groove 3b is provided on the outer diameter surface.

  The outer ring 6 is divided into an upper outer ring and a lower outer ring. The raceway surface 5 of the outer ring 6 has a spherical surface centered on the center of the bearing and can be aligned.

  The two rows of rollers with cages 7 interposed between the inner ring 3 and the outer ring 6 are divided into rollers with upper cages and rollers with lower cages.

  The one fastening ring 8 is fitted to the fixed member 9 side of the shaft 2, and the other fastening ring 8 ′ is fitted to the shaft shoulder 2 a of the shaft 2, and is fitted around these shafts 2. The part has the function of a spacer. Each fastening ring 8, 8 ′ has an arm portion 8 a fitted in the fitting groove 3 b of the inner ring 3.

  Each of the clamping rings 8, 8 'is divided into an upper clamping ring and a lower clamping ring, and both the clamping rings are connected by a clamping bolt 8b. The cross-sectional shape in the axial direction of the outer diameter surface 8c of each of the tightening rings 8 and 8 'is formed as a spherical surface having the same center as the raceway surface 5 of the outer ring 6, and the seal retainer 1c has a required clearance between the outer diameter surface 8c. And facing each other so as not to impair the aligning action.

  Each sealing member 1b closes the above-mentioned gap, and is in sliding contact with the outer diameter surface 8c of the fastening rings 8, 8 '.

  Between the shaft shoulder 2 a and the width surface 9 a on the other axial side of the fixing member 9, fastening rings 8 and 8 ′ fitted to the inner ring 3 are assembled.

  The fastening ring 8 on the fixing member 9 side is provided with a female screw 11 provided in a direction along the axial direction and a male screw 12 that is screwed to the female screw 11. The female screw 11 includes a hole 11a formed in the axial width surface of the tightening ring 8, and a stationary nut 11b fixed to the width surface. The male screw 12 is composed of a bolt, and in a screwed state, the head protrudes from the fastening ring 8 toward the fixing member 9 and faces the width surface 9 a of the fixing member 9. In other words, in the first embodiment, the axial direction built-in width W1 that is the axial length occupied by the fastening ring 8 on the fixing member 9 side between the shaft shoulder and the fixing member is the tip of the head of the male screw 12. To the flat surface 8d fitted to the width surface of the inner ring 3 on the fixing member side.

  When the inner ring 3 and the clamping rings 8 and 8 ′ are assembled between the shaft shoulder 2 a and the fixing member 9, the inner ring 3 and the clamping rings 8 and 8 ′ are movable in the axial direction with respect to the shaft 2. It is in a temporarily tightened state that fits. Specifically, as shown in FIG. 2, the inner ring 3 and the fastening rings 8, 8 ′ are fitted and integrated by connecting the fastening rings 8, 8 ′ with the fastening bolts 8 b, and the inner ring 3 is loosely fitted to the shaft 2. Then, the fastening ring 8 'on the side of the shaft shoulder 2a is brought into a state of facing the shaft shoulder 2a.

In this temporarily tightened state, the fixing member 9 is fixed to the small diameter portion of the shaft 2 with a set screw so that the head of the male screw 12 faces the width surface 9a. At this time, the male screw 12 is screwed to have a protrusion w on the fixing member 9 side. Further, the fastening ring 8 'on the shaft shoulder 2a side is provided so as to be in an assembled state separated from the fixing member 9 side with respect to the seal member 1b on the shaft shoulder 2a side. That is, the axial distance L between the shaft shoulder 2a and the fixing member 9 is the axial mounting width W1 of the fastening ring 8 on the fixing member 9 side, the axial mounting width W2 of the inner ring 3, and the axial shoulder 2a side. It is provided larger than the total dimension value of the clamping wheel 8 ′ and the axial mounting width W3, and due to this difference, the outer diameter surface 8c of the clamping wheel 8 ′ on the shaft shoulder 2a side and the seal on the shaft shoulder 2a side during mounting. The member 1b can be brought into a non-contact state.
If the male screw 12 has a screw allowance for the female screw 11 at the time of assembling, the male screw 12 is screwed into the female screw 11, thereby reducing the axial assembling width W1 of the fastening ring 8 on the fixing member 9 side. This is convenient when it is desired to change the mounting position of the fixing member 9.

  In the temporarily tightened state of FIG. 2, the head of the male screw 12 is exposed to the outside of the bearing housing 1 with the lid member 1a (see FIG. 1) removed, and can be rotated with a screwdriver. As a result, when the female screw 11 is protruded toward the fixing member 9 side, the head portion of the male screw 12 presses the width surface 9a of the fixing member 9 by the propulsive force, and the inner ring 3 in the temporarily tightened state receiving the repulsive force, both The clamping rings 8, 8 'are pushed and moved toward the shaft shoulder 2a. That is, when the male screw 12 is protruded in the axial direction with respect to the female screw 11, the axial incorporation width W1 of the fastening ring 8 on the fixing member 9 side is increased.

  Here, the protrusion allowance w is a length that can be fed until the fastening ring 8 'on the side of the shaft shoulder 2a contacts the shaft shoulder 2a as shown in FIG. For this reason, when the male screw 12 is protruded toward the fixing member 9 with respect to the female screw 11, the fastening ring 8 'on the shaft shoulder 2a side is brought into contact with the shaft shoulder 2a. The seal member 1b on the shoulder 2a side is brought into contact. The inner ring 3 and the tightening rings 8 and 8 ′ are positioned in the axial direction with respect to the shaft 2 by the contact between the shaft shoulder 2 a and the tightening ring 8 ′ on the side of the shaft shoulder 2 a, the male screw 12 and the fixing member 9.

  Therefore, according to the first embodiment, the outer ring surface of the clamping ring 8 'on the side of the shaft shoulder 2a is left in a state where the inner ring 3 and both clamping rings 8, 8' are temporarily tightened without floating the shaft 2 upward. 8c can be positioned above the seal 1b. In addition, you may make it perform said assembly in the state which removed the upper part of the bearing box 1. FIG.

  In this invention, the said internal thread and the said external thread can also be provided in an inner ring | wheel. As an example, FIG. 3 shows a second embodiment of the present invention. In the following, only the configuration different from the first embodiment will be described.

  In the second embodiment shown in FIG. 3, a female screw 22 is provided which includes a hole 22 a formed in the width surface of the inner ring 21 on the fixing member 9 side and a stationary nut 22 b fixed to the width surface.

  The clamping ring 24 is provided so as not to protrude in the axial direction from the outer diameter surface of the inner ring 21 so as not to interfere with the male thread 23 screwed on the female thread 22. 'Is also provided in the same way.

  As another member that is integrally positioned with the inner ring 21 and is positioned in the axial direction, the positioning ring is divided into two parts, which are fitted into the shaft 2 between the inner ring 21 and the fixing member 9, and the inner ring 21 and the shaft shoulder 2a. 25 and 25 'are provided.

  Accordingly, in the second embodiment, the axially built-in width W2 of the inner ring 3 is the axial length from the width surface on the shaft shoulder 2a side to the tip of the male screw 23. Further, the male screw 23 pushes the fixing member 9 through the positioning wheel 25 during the above rotation operation. The outer diameter surfaces of the positioning wheels 25, 25 'are the sliding portions of the seal member 1b.

  In the present invention, the circumferential direction arrangement of the female screw and the male screw can be determined as appropriate, and the circumferential direction equality is good for obtaining a stable movement. Further, the number of arrangement is not particularly limited. Although not particularly shown, both the inner ring, the tightening member, and the positioning ring can be provided with a female screw and a male screw as in the above embodiment. Further, a female screw and a male screw facing the inner ring can be provided on the tightening member and the positioning ring. Further, the female screw can be passed through another member so that the male screw protrudes from the fixed member side toward the inner ring side.

Sectional drawing of the principal part in the state where the split bearing according to the first embodiment is positioned in the axial direction Sectional drawing of the principal part of the state in which the split bearing according to the first embodiment is temporarily fastened to the shaft Sectional drawing of the principal part in the state where the split bearing according to the second embodiment is positioned in the axial direction

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing housing 1b Seal member 2 Shaft 2a Shaft shoulder 3, 21 Inner ring 6 Outer ring 7 Rolling body 8, 8 ', 24, 24' with cage Clamping ring (separate member)
8c Outer diameter surface 9 Fixing member 11, 22 Female thread 12, 23 Male thread 25, 25 'Positioning wheel (separate member)
W1, W2, W3 Axial installation width

Claims (3)

The inner ring and the inner ring are divided between an inner ring and an outer ring that are divided into two parts vertically, a rolling element with a cage that is divided into two parts between the inner and outer rings, and a fixed member attached to the shaft shoulder and the shaft side. In a split bearing with a separate member incorporated together,
At least one member of the inner ring and the separate member is provided with a female screw oriented in the axial direction and a male screw screwed to the female screw, and the inner ring and the separate member are between the shaft shoulder and the fixing member. When the male screw is protruded in the axial direction with respect to the female screw in a state of being incorporated into the female screw, the axially incorporated width of the one member is increased.   The separate member is composed of an upper and lower split ring that is fitted to the outer diameter surfaces of both ends of the inner ring in the axial direction, and the internal thread and the external thread that face the fixed member on the fixed ring on the fixed member side The split bearing according to claim 1, wherein:   The outer ring, the inner ring, and the separate member are incorporated in a bearing box that is divided into two vertically, and the outer diameter surface of the tightening ring on the shaft shoulder side is slid onto the seal member on the shaft shoulder side provided in the bearing box. When the male screw is protruded in the assembled state in which the shaft shoulder side tightening ring is separated from the fixing member side with respect to the seal member, the shaft shoulder side tightening ring moves to the shaft shoulder side. The split bearing according to claim 2, wherein the sliding portion comes into contact with the seal member.

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