JPH0663929U - Thrust bearing - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to prevent the outer peripheral side of the thrust bearing pad from being burned or scratched even if the thrust collar is tilted. [Structure] A thrust bearing pad is interposed between a thrust collar attached to a rotary shaft and a leveling device to support a thrust force generated on the rotary shaft. Set it low and configure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thrust bearing applied to a rotary shaft of a rotary machine.

[0002]

[Prior art]

 FIG. 3 is an explanatory view of a conventional tilting pad type thrust bearing used for a rotary shaft of a rotary machine. In the figure, the rotary shaft 1 and the thrust collar 1a are integrally provided, and the thrust bearing pad 2 supports the thrust force generated in the rotary shaft 1 through the thrust collar 1a. The thrust bearing pad 2 is housed in a bearing housing 4, and a leveling device 3 is provided between the bearing housing 4 and the thrust bearing pad 2 so that the thrust bearing pad 2 receives the thrust force uniformly. ing. Lubricating oil is interposed between the thrust collar 1a and the thrust bearing pad 2, and the thrust force generated on the rotary shaft 1 is indirectly supported via this lubricating oil.

In order to fully exert the function of such a tilting pad type thrust bearing, the thrust collar 1a is positioned at a right angle to the rotation center of the rotary shaft 1, and the thrust bearing pad 2 is also positioned at a right angle. Therefore, for example, a Mitchell type leveling device 3 capable of self-adjustment is used for that purpose. The back surface of the thrust bearing pad 2 presents a cylindrical surface or a vertical surface, so that the thrust bearing pad 2 makes line contact or point contact with the leveling device 3. The leveling device 3 and the bearing housing 4 are in surface contact with each other. When the thrust collar 1a is not located in parallel with the thrust bearing pad 2, a large thrust load acts on the specific thrust bearing pad 2 to cause deformation as shown by the dotted line, so that the load on each thrust bearing pad 2 is reduced. Can be uniform.

[0004]

[Problems to be solved by the device]

 However, in the conventional tilting pad type thrust bearing as described above, when the rotating shaft 1 is longer than the shaft diameter, the thrust collar 1a is deformed due to the deflection of the rotating shaft 1 due to its own weight. With respect to the thrust bearing pad 2, the load on the thrust bearing pad 2 becomes excessively unbalanced, and the outer peripheral side of a part of the thrust bearing pad 2 may be burned or damaged. Further, when the temperature difference around the bearing housing 4 changes significantly, the squareness between the rotary shaft 1 and the thrust collar 1a is greatly deviated, and the thrust collar 1a is partially hit. In either case, there is no problem if the leveling function of the leveling device 3 has a margin, but it is necessary to make the perpendicularity between the rotary shaft 1 and the thrust bearing tight.

[0005]

[Means for Solving the Problems]

 The thrust bearing according to the present invention is intended to solve the above problems.Thus, a thrust bearing pad is interposed between a thrust collar mounted on the rotary shaft and a leveling device to prevent the thrust force generated on the rotary shaft from being generated. In the supporting thrust bearing, the thrust bearing pad is characterized in that the outer peripheral side of the back surface, which is in contact with the leveling device, is provided low.

[0006]

[Action]

 That is, in the thrust bearing according to the present invention, the thrust bearing pad is interposed between the thrust collar attached to the rotary shaft and the leveling device, and the thrust bearing pad in the thrust bearing supporting the thrust force generated in the rotary shaft is Even if the thrust collar tilts, the thrust bearing pad is tilted along the tilt of the thrust collar due to the lower outer circumference of the thrust bearing pad. It is possible. In this case, only the thrust bearing pad that is heavily loaded with the tilt of the thrust color is tilted, and the other thrust bearing pads are not tilted and operate in the assembled state. Then, the outer peripheral side of the thrust bearing pad, which is inclined along the inclination of the thrust color, is parallel to the thrust collar without any one-sided contact and supports the thrust force generated on the rotating shaft.

[0007]

1 is an explanatory view of a tilting pad type thrust bearing according to an embodiment of the present invention, and FIG. 2 is an explanatory view of a tilting pad type thrust bearing according to another embodiment of the present invention. . In FIG. 1, a tilting pad type thrust bearing according to the present embodiment is used for a rotary shaft of a rotary machine. Reference numeral 1 in the drawing is a rotary shaft, 1a is a thrust collar, and 2 is a tilting type. Thrust bearing pads, 3 is a leveling device, and 4 is a bearing housing. The rotary shaft 1 and the thrust collar 1a are integrally provided, and the thrust bearing pad 2 supports the thrust force generated in the rotary shaft 1 via the thrust collar 1a. The thrust bearing pad 2 is housed in a bearing housing 4, and a leveling device 3 is provided between the bearing housing 4 and the thrust bearing pad 2 so that the thrust bearing pad 2 receives a uniform thrust force. ing. Lubricating oil is interposed between the thrust collar 1a and the thrust bearing pad 2, and the thrust force generated on the rotary shaft 1 is indirectly supported via this lubricating oil.

In order to fully exert the function of such a tilting pad type thrust bearing, the thrust collar 1a is positioned at a right angle to the rotation center of the rotary shaft 1, and the thrust bearing pad 2 is also positioned at a right angle. The Mitchell type leveling device 3 capable of self-adjustment is used for this purpose. The back surface of the thrust bearing pad 2 has a cylindrical surface or a circular surface, and thus the thrust bearing pad 2 makes line contact or point contact with the leveling device 3. The leveling device 3 and the bearing housing 4 are in surface contact with each other.

Further, in the tilting pad type thrust bearing, in order to prevent uneven contact of the thrust bearing pad 2, the outer peripheral side of the rear surface of the thrust bearing pad 2 having a cylindrical surface as shown in FIG. A spherical relief portion 5 is provided in the radial direction, and the radial length b of the relief portion 5 is a with respect to the remaining radial length a as shown in FIG. > B. The escape portion 5 has the best spherical shape, but may have a cylindrical surface or a conical surface shape, or may have a notch. By forming the thrust bearing pad 2 in this way, when the thrust bearing pad 2 is subjected to a one-sided load, the thrust bearing pad 2 is provided with a relief portion 5 as shown in FIG. The other thrust bearing pad 2 keeps parallel to the surface of the thrust collar 1a within the function of the leveling device 3.

Instead of the spherical relief portion 5 on the back surface of the thrust bearing pad 2, a partial chamfer 6 may be provided as shown in FIG. That is, a chamfer 6 is provided on the outer peripheral side of the back surface of the thrust bearing pad 2 forming a cylindrical surface, and by making such a chamfer 6, the thrust bearing pad 2 can be easily tilted. Also in this case, the length of the chamfer 6 is less than 50% of the length in the radial direction. As a result, the same effects as those of the tilting pad type thrust bearing according to the above-described embodiment can be obtained.

In the conventional tilting pad type thrust bearing, when the rotating shaft 1 is longer than the shaft diameter, the thrust collar 1 a is deformed relative to the bearing housing 4 due to the bending of the rotating shaft 1 due to its own weight. Since the thrust bearing pad 2 is excessively unbalanced due to a large inclination, the outer peripheral side of a part of the thrust bearing pad 2 may be burned or damaged. Further, when the temperature difference around the bearing housing 4 changes greatly, the squareness between the rotary shaft 1 and the thrust collar 1a is greatly deviated, and the thrust collar 1a is unevenly contacted. However, the tilting according to the above-described embodiment is performed. In the pad type thrust bearing, the thrust bearing pad 2 is provided only on the outer peripheral side of the back surface of the thrust bearing pad 2 with a relief portion 5 which does not exceed 50% of the radial length (pad width), or by chamfering 6. 2 makes it possible to easily incline along the inclination of the thrust collar 1a, and only the thrust bearing pad 2 that is heavily loaded with the inclination of the thrust color 1a due to the inclination of the rotating shaft 1 inclines on the opposite side. Since the thrust bearing pad 2 of No. 2 operates without being tilted, it does not rotate, so the outer circumference of the thrust bearing pad 2 is subject to a large one-sided load. It is possible to support the thrust force generated on the rotary shaft 1 in parallel with the thrust collar 1a without wasting, and to prevent the thrust bearing pad 2 from being burned or scratched. It is easy to perform quality control during assembly, for example, the allowable value of the relative inclination of 1a can be increased. The thrust bearing pad 2 and the leveling device 3 are in line contact as before, and the allowable bearing load is the same as that of the conventional tilting pad type thrust bearing. It prevents the one-sided contact.

[0012]

[Effect of device]

 The thrust bearing according to the present invention is configured as described above, and even if the thrust collar is tilted, the outer peripheral side of the thrust bearing pad tilted along the tilt of the thrust collar rotates parallel to the thrust collar without uneven contact. It supports the thrust force generated on the shaft, so the outer peripheral side of the thrust bearing pad will not be burned or scratched.

[Submission date] April 30, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

In the conventional tilting pad type thrust bearing, when the rotating shaft 1 is longer than the shaft diameter, the thrust collar 1 a is deformed relative to the bearing housing 4 due to the bending of the rotating shaft 1 due to its own weight. Since the thrust bearing pad 2 is excessively unbalanced due to a large inclination, the outer peripheral side of a part of the thrust bearing pad 2 may be burned or damaged. Further, when the temperature difference around the bearing housing 4 changes greatly, the squareness between the rotary shaft 1 and the thrust collar 1a is greatly deviated, and the thrust collar 1a is unevenly contacted. However, the tilting according to the above-described embodiment is performed. In the pad type thrust bearing, the thrust bearing pad 2 is provided only on the outer peripheral side of the back surface of the thrust bearing pad 2 with a relief portion 5 which does not exceed 50% of the radial length (pad width), or by chamfering 6. 2 can be easily tilted along the tilt of the thrust collar 1a, and only the thrust bearing pad 2 that is heavily loaded with the tilt of the thrust color 1a due to the tilt of the rotary shaft 1 operates tilted . Therefore, the outer peripheral side of the thrust bearing pad 2 which receives a large one-sided load is not one-sided, and is parallel to the thrust collar 1a. With a scan last force generated on the rotary shaft 1 can be supported without waste, is prevented and seizure or scratching of the thrust bearing pad 2, that the relative tilt allowance of the thrust collar 1a to greatly it can. Since the thrust bearing pad 2 and the leveling device 3 are in line contact with each other, the quality control during assembly is easy, and the allowable bearing load is the same as that of the conventional tilting pad type thrust bearing. One-sided contact is prevented while providing the advantages of a cylindrical pad or a drooping pad.

[Brief description of drawings]

1A is a sectional view of a tilting pad type thrust bearing according to an embodiment of the present invention, FIG. 1B is a perspective view of the thrust bearing pad, and FIG. FIG.

FIG. 2 is a perspective view of a thrust bearing pad of a tilting pad type thrust bearing according to another embodiment of the present invention.

3 (a) is a sectional view of a conventional tilting pad type thrust bearing, FIG. 3 (b) is a perspective view of the thrust bearing pad, and FIG. 3 (c) is an explanatory view of its action.

[Explanation of symbols]

 1 Rotating shaft 1a Thrust collar 2 Tilting type thrust bearing pad 3 Leveling device 4 Bearing housing 5 Relief part 6 Chamfer

Claims (1)

[Scope of utility model registration request] 1. A thrust bearing for supporting a thrust force generated on the rotary shaft, wherein a thrust bearing pad is interposed between a thrust collar attached to the rotary shaft and the leveling device, wherein the thrust bearing pad is provided with the leveling device. A thrust bearing characterized in that the outer peripheral side of the back surface which comes into contact is provided low.