JP2002235754A - Two-split bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the hardness of the outer diametral surface of a fastening member of an inner race for brining a sealing member of a bearing box into slidable contact to prescribed high hardness at low cost in a constitution for brining the sealing member into slidable contact with the outer diametral surface so as to seal the inside of a two-split type self-aligning roller bearing. SOLUTION: In the two-split type self-aligning roller bearing in which an inner race 3 and an outer race 6 split into two parts in the vertical direction are assembled at the inside of the bearing box 1 split into two parts in the vertical direction, a roller 7 with a cage split into two parts in the vertical direction is interposed between the inner race 3 and the outer race 6, fastening races 8 and 8' split into two parts in the vertical direction are fitted into outer diameter surfaces of both end parts in the axial direction of the inner race 3, the bearing box 1 and each upper and lower split body of the fastening races 8 and 8' are integrally coupled by each fastening member, and sealing members 29 and 29 mounted at both end parts in the axial direction of the inner diametral surface of the bearing box 1 are brought into slidable contact with outer diametral surfaces 28 and 28 of the fastening races 8 and 8', hard chromium plating is applied to the outer diametral surfaces 28 of the fastening races 8 and 8' and the hardness is set to Hs 70 or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split bearing, and is applied to, for example, a self-aligning roller bearing for supporting a trunnion shaft of a converter in a steel manufacturing facility.

[0002]

2. Description of the Related Art A self-aligning roller bearing suitable for receiving a vibration or an impact load is used as a bearing portion of a trunnion shaft which supports a furnace body of a converter. In addition, the spherical roller bearings
In order to facilitate repair and replacement, a split type is often used.

[0003] In the split type spherical roller bearing, generally, an inner ring and an outer ring which are divided into upper and lower parts are assembled inside a bearing box which is divided into upper and lower parts. With the two-part caged rollers interposed, the upper and lower two-part tightening rings are fitted to the outer diameter surfaces of both ends in the axial direction of the inner ring, and the two-part tightening rings are connected to each other to form the inner ring. A structure in which the upper and lower divided bodies of the bearing box are integrally joined by a tightening member, and seal members attached to both axial ends of the inner diameter surface of the bearing box are slidably contacted with the outer diameter surface of the tightening wheel. It is. In order to provide alignment, the raceway surface of the outer ring is formed in a spherical surface centering on the bearing center, and the rollers are formed in a barrel shape along the spherical surface.

[0004]

The above-mentioned bearing has the following problems. Since the outer diameter surface of the fastening member needs to have a certain hardness or more to maintain the sealing characteristics by sliding contact with the sealing member, conventionally, the hardness of the base material itself is adjusted by a heat treatment technique such as high-frequency induction heating. However, this causes thermal deformation and increases costs. This bearing is often used on the fixed side, and it is preferable that there is no backlash (gap) in the axial direction. However, considering productivity and cost, considering the dimensional tolerance of each part, Axial play between the fixing members increases. Since the bolt hole and the bolt for fastening the vertically divided bearing box have play (gap), the upper and lower bearing boxes may be shifted in the radial direction or the axial direction and tightened. In addition, the split surface of the bearing housing and the split surface of the outer ring may be assembled so as to match each other. As described above, if the bearing housing is tightened while being shifted in the radial direction, the outer race is also shifted in the radial direction, and as a result, there is a problem in that a step is formed on the rolling surface of the outer race.

Accordingly, the present invention is to increase the hardness of the outer diameter surface of the tightening member without heat treatment, to reduce the play after assembly as much as possible, and to prevent the divided members of the upper and lower outer rings from shifting in the radial direction. The task is to

[0006]

In order to solve the above-mentioned problems, the present invention relates to a method of assembling a vertically divided inner ring and an outer ring into a vertically divided bearing housing, and mounting these inner and outer rings. A rolling element with a cage divided vertically into two parts is interposed between the outer ring and the outer ring, and a tightening ring divided into two parts vertically is fitted on the outer diameter surfaces of both ends in the axial direction of the inner ring, and the divided two parts are tightened. In a split bearing in which rings are connected to each other and the inner ring is tightened, and seal members mounted on both axial ends of the inner diameter surface of the bearing housing are slidably contacted with the outer diameter surface of the tightening ring, the outer diameter of the tightening ring A configuration in which a hard chrome plating layer was formed on the surface was adopted.

[0007] By forming the above hard chrome plating layer on the outer diameter surface of the tightening ring which is in sliding contact with the seal member, the hardness of the outer diameter surface becomes Hs70 or more. This hardness is Hs7
If it is less than 0, abrasion or galling occurs due to sliding contact with the seal member on the outer diameter surface, and further progress causes leakage of bearing lubrication oil, intrusion of foreign matter into the bearing, breakage of the seal portion, and peeling of the bearing. To reach.

[0008] With respect to one of the tightening rings assembled at both ends in the axial direction of the inner ring, an allowance portion having a predetermined width in the axial direction defined by a stepped portion is provided on the outer diameter surface of the tightening ring. Configuration can be adopted. When such a margin is provided, the width of the shaft on which the bearing is mounted is measured at the time of mounting the bearing, and the backlash in the axial direction can be reduced by on-site processing.

In this case, considering the ease of assembly, it is desirable that the amount of backlash be set to 0.5 mm or more and 1.0 mm or less. Specifically, the width A on the shaft on which the bearing is assembled is specifically described. The relationship between the inner ring width dimension W ″ and the calculated total dimension B of the tightening ring width dimensions W and W ′ is 0.5 m
Assume that m <AB <1.0 mm.

The above-mentioned in-situ processing is performed after the above-mentioned hard chrome plating is applied to the outer diameter surface. Does not cause cracking or peeling of the plated portion.

It is desirable that the angle between the divided surfaces of the outer race and the bearing housing be set to be more than 0 degree and 8 degrees or less. When this angle is larger than 0 degree, it is possible to prevent a relative radial displacement between the outer ring and the bearing housing. If it exceeds 8 degrees, when assembling the rolling element with cage,
Interference with the outer ring occurs, making assembly difficult.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The split type spherical roller bearing shown in FIGS. 1 to 4 includes a bearing housing 1, an inner ring 3 assembled inside the outer circumference of a shaft 2 inside the bearing housing 1, and a spherical raceway surface facing the double row raceway surfaces 4, 4. , A plurality of rows of rollers 7 with cages interposed between the inner ring 3 and the raceways 4, 5 of the outer ring 6, and tightening rings 8, 8 ′ assembled on the outer periphery of both ends in the axial direction of the inner ring 3. Consists of

As shown in FIG. 1, the bearing housing 1 is divided into two parts, an upper bearing housing 1a and a lower bearing housing 1b, at a dividing surface 9. Base 1 in lower bearing box 1b
1 are provided integrally. Upper bearing box 1a and lower bearing box 1
b is integrated by fastening bolts 13 at the fastening portions 12 on both sides.

The upper bearing box 1a and the lower bearing box 1b are shown in FIG.
As shown in (1), one end in the axial direction is open, and the lid member 1c is fixed to the open portion by bolts 14. Also,
Sealing portions 15 are provided at both axial ends of the bearing housing 1.

The above-mentioned inner ring 3 is divided into divided surfaces 16 (see FIG. 4).
Is divided into an upper inner ring 3a and a lower inner ring 3b. The upper inner race 3a and the lower inner race 3b are both provided with fitting portions 17, 17 (see FIG. 2) protruding in the axial direction at both ends thereof, and a fitting groove 18 provided on the outer diameter surface of each fitting portion 17. Can be

The outer ring 6 is divided into a split surface 19 (FIGS. 3 and 4).
) Is divided into an upper outer ring 6a and a lower outer ring 6b. The raceway surface 5 of the outer race 6 forms a spherical surface centering on the center of the bearing, and is capable of aligning.

The two rows of rollers with retainers 7 interposed between the inner ring 3 and the outer ring 6 are provided with rollers 7a with upper retainers and lower retainers 7a on the dividing surface 21 (see FIGS. 3 and 4). The roller is divided into rollers 7b. The rollers 23 held by the holder 22 (see FIG. 2) are formed in a barrel shape along the spherical raceway surface 5 of the outer ring 6.

The above-mentioned tightening wheel 8 is fitted around the small diameter portion of the shaft 2, and the other tightening wheel 8 ′ is fitted around the large diameter portion of the shaft 2, The portion fitted around has a width of W, W 'and has the function of a spacer.
Further, each of the tightening rings 8, 8 ′ is fitted into the fitting groove 18
And has an arm portion 24 fitted to the arm.

Each of the tightening wheels 8 and 8 ′ has an upper tightening wheel 8 a, 8 ′ a and a lower tightening wheel 8 b,
8′b. These upper tightening wheels 8a, 8 '
and a lower tightening wheel 8b, 8'b opposed thereto is provided with a tightening portion 26 (see FIG. 3) with a dividing surface 25 interposed therebetween, and is connected by a tightening bolt 27. The axial cross-sectional shape of the outer diameter surfaces 28, 28 of the tightening rings 8, 8 'is formed as a spherical surface having the same center as the raceway surface 5 of the outer ring 6,
The seal portions 15, 15 of the bearing housing 1 are opposed to the outer diameter surface 28 with a required clearance so that the centering action is not impaired.

A seal member 29 for closing the above gap,
Reference numeral 29 is attached to each seal portion 15 and slidably contacts the outer diameter surface 28. As shown in FIG. 5, a hard chrome plating layer 30 is formed on the outer diameter surface 28, and the portion of the plating layer 30 serves as a sliding contact surface of the seal member 29. The hardness of the outer diameter surface 28 of the hard chrome plating layer 30 is Hs7.
0-85 are obtained.

A margin 32 having a step 31 (see FIG. 5) is formed at the outer end of the outer diameter surface 28 of the tightening wheel 8.

In FIG. 2, the axial width from the step portion 34 of the shaft 2 to the fixing member 33 is indicated by A, and the inner ring width W ″.
And the calculated total dimension of the tightening ring width dimensions W and W '(= W
+ W ′ + W ″) is indicated by B, and the amount of play (gap) in the axial direction is indicated by a, and there is a relationship of a = AB. This play a is 0.5 mm <
a <1.0 mm is selected. Therefore, 0.5 mm <A
The end face having the width W of the tightening wheel 8 is subjected to on-site alignment processing so as to satisfy the relationship of −B <1.0 mm. Thereby, it is possible to set to have a predetermined play amount a.

In the above-mentioned in-situ processing, the end face to be processed is separated from the portion of the plating layer 30 by the width A of the allowance 32, so that it is not necessary to peel off the plating or generate a crack during the processing. Can be

As shown in FIG. 3, by setting the angle θ of the divided surface 19 of the outer ring 6 with respect to the divided surface 9 of the bearing box 1 to be larger than 0 degree, the upper bearing box 1a and the upper outer ring 6a , Is prevented from shifting in the radial direction as a unit. The upper limit of the angle θ is limited to an angle (8 degrees) at which the roller with cage 7 can be assembled.

[0025]

As described above, the split bearing according to the present invention can be provided with the required hardness by applying hard chrome plating to the outer diameter surface of the tightening ring which is in sliding contact with the seal member. Good sealing performance can be maintained at low cost over a long period of time. In addition, it is possible to easily realize the minimum play required by the on-site processing. Further, by shifting the position of the split surface of the outer ring by a predetermined angle with respect to the split surface of the bearing housing, it is possible to prevent the upper outer ring from shifting in the radial direction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a use state of an embodiment.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 2;

FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a partially enlarged cross-sectional view of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing case 1a Upper bearing case 1b Lower bearing case 2 Shaft 3 Inner ring 3a Upper inner ring 3b Lower inner ring 4 Track surface 5 Track surface 6 Outer ring 6a Upper outer ring 6b Lower outer ring 7 Roller with cage 7a Roller with upper cage 7b Lower cage Attachment roller 8, 8 'Tightening ring 9 Dividing surface 11 Base 12 Tightening portion 13 Internal tightening bolt 14 Bolt 15 Sealing portion 16 Dividing surface 17 Fitting portion 18 Fitting groove 19 Dividing surface 21 Dividing surface 22 Cage 23 Roller 24 Arm Part 25 Dividing surface 26 Tightening part 27 Tightening bolt 28 Outer diameter surface 29 Seal member 30 Hard chrome plating layer 31 Step part 32 Removal allowance 33 Fixing member

Continued on the front page F term (reference) 3J012 AB03 BB02 CB10 DB02 FB12 3J016 AA05 BB12 CA07 3J101 AA15 AA43 AA52 AA62 BA52 FA42 GA34

Claims (5)

[Claims] An inner ring and an outer ring which are vertically divided into two parts are assembled inside a bearing box which is divided into two parts vertically, and a rolling element with a cage which is vertically divided into two parts is interposed between the inner ring and the outer ring. Interposed, the upper and lower two-part tightening rings are fitted to the outer diameter surfaces of both ends in the axial direction of the inner ring, the two-part tightening rings are connected to each other to tighten the inner ring, and the upper and lower parts of the bearing box In a split bearing, the divided bodies are integrally joined by a tightening member, and seal members attached to both axial ends of the inner diameter surface of the bearing box are slidably contacted with the outer diameter surface of the tightening ring. Split bearing characterized by forming a hard chrome plating layer on the surface. 2. One of the tightening rings assembled at both axial ends of the inner ring is provided with an allowance portion having a predetermined width in the axial direction defined by a step on the outer diameter surface thereof. The split bearing according to claim 1, wherein: 3. A width A of a bearing assembly portion on a shaft on which the bearing is mounted, a width W ″ of a bearing inner ring, a width W ′ of each tightening ring, and a total dimension B of W (= W + W ′ + W ′). The split bearing according to claim 1 or 2, wherein the relationship of (1) is 0.5 mm <AB <1.0 mm. 4. The split bearing according to claim 1, wherein an angle between each of the divided surfaces of the outer ring and the bearing box is more than 0 ° and 8 ° or less. 5. The split bearing according to claim 1, wherein said bearing is a self-aligning roller bearing.