JP2012159183A - Thrust bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust bearing which can be temporarily fixed to a shaft and a housing with a simple means without altering shapes of the bearing itself, the shaft, and the housing.SOLUTION: The thrust bearing has at least one raceway rings (outer diameter raceway ring 2, inner diameter raceway ring 4) having raceway surfaces (outer diameter side raceway surface 2s, inner diameter side raceway surface 4s) and a plurality of rolling bodies arranged along a peripheral direction to the raceway surfaces, the raceway rings have annular raceway plate part (outer diameter side flat plate part 2a, inner diameter side flat plate part 4a) where raceway surfaces are formed and cylinder parts (outer diameter side cylinder part 2b, inner diameter side cylinder part 4b) extending from the inner peripheral parts or the outer peripheral parts of the raceway flat plate part to the one side of an axial direction, the coatings 12 for arranging fastening margins s2 with the fitting surfaces 10s of the counter side members (the shaft, the housing or others) 10 temporarily fixing the thrust bearing by thrust fitting are applied in at least outer surfaces of the cylinder parts (for example, the inner peripheral surfaces 40b) of the outer peripheral surfaces of the raceway rings.

Description

  The present invention relates to a thrust bearing, and more particularly to a thrust bearing mainly used in automobile transmissions, air conditioner compressors, torque converters, and the like.

  Conventionally, various rolling bearings have been used to rotatably support a predetermined rotating shaft, and the bearing types of the rolling bearings can be roughly classified into radial bearings and thrust bearings depending on the direction of the load to be applied. Further, it can be classified as a ball bearing or a bearing according to the type of rolling element. For example, a thrust roller bearing is mounted on a rotating portion of an automobile transmission, an air conditioner compressor or a torque converter, and an axial axial load (thrust load) applied to the rotating portion is applied.

When such a thrust roller bearing (hereinafter also referred to as a thrust bearing or a bearing) is mounted on a transmission or the like, if the thrust bearing is temporarily fixed to a shaft or a housing, the posture of the bearing becomes stable during work, and Work in the process can be performed smoothly, and it is easy to improve work efficiency (workability).
However, conventionally, a special mechanism for temporarily fixing the thrust bearing to a shaft, a housing, or the like (for example, a locking mechanism including an engaging portion such as a protrusion and an engaged portion such as a groove) has not been provided. Even if the assembly process to the transmission continues after the assembly of the bearing itself, the thrust bearing cannot be easily temporarily fixed to the shaft, the housing, or the like. For this reason, in the next process such as the assembly process to the transmission, the attitude of the thrust bearing is not stable, which causes the workability to deteriorate.

Therefore, various measures for temporarily fixing the thrust bearing have been taken in order to stabilize the bearing posture in the assembly process to the transmission.
For example, as shown in FIG. 10, Patent Document 1 discloses a race ring (outer diameter raceway) arranged on the outer diameter side of two race rings (laces) 52 and 54 arranged to face each other so as to be relatively rotatable. One configuration of a thrust roller bearing is disclosed in which protrusions (snap protrusions) 56 are provided on the outer periphery of the ring 52 at a predetermined interval in the circumferential direction or continuously over the entire periphery. By providing such a protrusion, the protrusion can be engaged with a groove formed in the housing (for example, a notch in the casing of the transmission), and the bearing posture is stabilized.

Special table 2009-543990

  As represented by Patent Document 1, a protrusion (engagement portion) is provided on a bearing ring of a thrust bearing, and a groove (engaged portion) that can engage the protrusion is formed in a housing. In the mechanism, it is necessary to form these protrusions and grooves. However, it is not a measure to change the shape of the bearing and, in some cases, the shape of the shaft or the housing, but a simpler means, for example, means that can deal with a general shape without requiring processing of protrusions and grooves. Therefore, there is a demand for a measure that enables temporary fixing of the thrust bearing.

  The present invention has been made in order to solve such a problem, and the object thereof is to change the shape of the counterpart by simple means without changing the shape of the bearing itself and the counterpart member (for example, a shaft or a housing). An object of the present invention is to provide a thrust bearing that can be temporarily fixed to a side member.

  In order to achieve such an object, a thrust bearing according to the present invention includes at least one bearing ring having a raceway surface, and a plurality of rolling elements arranged along the circumferential direction with respect to the raceway surface. The raceway ring has an annular raceway flat plate portion formed with a raceway surface, and a cylindrical portion extending from the inner peripheral edge portion of the raceway flat plate portion or the outer peripheral edge portion to one side in the axial direction, Of the outer surface of the raceway, at least the outer surface of the cylindrical portion has a coating for providing an interference between the thrust bearing and a mating surface of a mating member that temporarily fixes the thrust bearing by fitting. It has been subjected.

In this case, the coating can be applied by applying a paint. For example, as the paint, either one or both of a solid lubricant and a solid rust preventive agent may be attached and coated.
The coating can also be applied by attaching an elastic material.

These coatings can be applied to any range, form, and site as long as the thrust bearing can be temporarily fixed by press-fitting with a predetermined interference between the mating surface of the mating member. It does not matter.
For example, the coating may be applied to at least the entire outer surface of the cylindrical portion of the outer surface of the race, or may be applied to at least a part of the outer surface of the cylindrical portion. Good.
In addition, when it is set as the structure given to at least one part of the outer surface of the said cylindrical part among the outer surfaces of the said ring, for example, the said coating continues continuously over the perimeter of the outer surface of the said cylindrical part. The structure which gave may be sufficient and the structure given to the outer surface of the said cylindrical part at predetermined intervals with respect to the circumferential direction may be sufficient.

  Further, the coating may be configured such that the interference is substantially constant with respect to the press-fitting direction of the bearing, or the coating is applied so that the interference increases toward the press-fitting direction of the bearing. Also good.

  According to the present invention, the thrust bearing can be temporarily fixed to the mating member by simple means without changing the shapes of the bearing itself and the mating member (for example, a shaft or a housing). Specifically, the peripheral surface of the race (race) set to the same inner diameter or outer diameter as before is coated with a paint such as solid lubricant or solid rust preventive, or an elastic material such as resin or rubber. As a result, the thrust bearing can be temporarily fixed with an interference between the shaft and the housing. As a result, it is possible to stabilize the bearing posture in the assembly process to the transmission, and to improve the workability.

It is a figure showing the configuration of a thrust bearing according to an embodiment of the present invention, wherein (a) is the entire inner peripheral surface (all peripheral surfaces) of the inner diameter side cylindrical portion with respect to the press-fitting direction of the bearing. A longitudinal sectional view of the inner diameter raceway ring coated so that the interference is substantially constant, (b) is a plan view of FIG. A plan view of an inner diameter raceway ring in which the same plurality of coatings are applied to the inner peripheral surface of the inner diameter side cylindrical portion at predetermined intervals in the circumferential direction so that the interference in the press-fitting direction of the bearing is substantially constant. is there. FIG. 7 is a diagram showing an inner diameter raceway ring in which a plurality of coatings that are continuous over the entire inner circumferential surface of the inner diameter side cylindrical portion are provided at substantially equal intervals from one side to the other side in the axial direction; FIG. 4 is a longitudinal sectional view showing a state before the bearing is press-fitted (pressed) into the counterpart member, and FIG. 4B is a longitudinal sectional view showing a state after the bearing is press-fitted (pressed) into the counterpart member. It is a figure showing an inner diameter bearing ring coated so that the interference increases as it goes in the press-fitting direction of the bearing, (a) is a longitudinal sectional view of the inner diameter bearing ring in which the entire coating is tapered, b) is a longitudinal sectional view of an inner ring raceway in which only a part of the coating is tapered. It is a figure which shows the internal diameter raceway ring coated over the wide range from the internal diameter side cylindrical part, Comprising: (a) is all the outer surfaces of an internal diameter raceway ring (the inner peripheral surface of an internal diameter side cylindrical part, an internal diameter side plane part) (B) is a coating of the inner peripheral surface of the inner diameter side cylindrical portion and the outer bent surface of the bent portion. It is a longitudinal cross-sectional view of the internal diameter bearing ring which gave. It is a longitudinal cross-sectional view of the internal diameter race ring which coated the outer peripheral surface of the internal diameter side cylindrical part. It is a figure which shows the outline | summary of the procedure which coats only the inner peripheral surface of an internal diameter side cylindrical part, (a) is a longitudinal cross-sectional view of the internal diameter raceway ring before applying a coating, (b) is an internal diameter side. A longitudinal sectional view of the inner diameter raceway in a state where masking is performed on the outer surface, the inner surface, and the end face except for the inner peripheral surface of the cylindrical portion, and FIG. It is a longitudinal cross-sectional view of the internal diameter bearing ring of the state made to adhere by apply | coating a coating material to the internal peripheral surface of a part. It is a figure which shows the state of the coating in the case of temporarily fixing the thrust bearing which coated the inner peripheral surface of the internal diameter side cylindrical part with respect to the other party member, (a) FIG. 5B is a diagram showing a state in which the thrust bearing and the counterpart member are arranged at predetermined positions; FIG. 5B is a diagram illustrating a state in which the thrust bearing and the counterpart member are relatively press-fitted (pressed) with a solid lubricant or a solid rust inhibitor. It is a figure which shows the state from which the part corresponded to the interference of the applied coating was shaved and peeled off from the fitting part. It is a figure which shows the clearance gap (clearance) of the internal peripheral surface of the internal diameter side cylindrical part and the fitting surface of the other party member in the state before coating. It is a longitudinal cross-sectional view which shows the structure of the conventional thrust bearing.

  Hereinafter, a thrust bearing (hereinafter also simply referred to as a bearing) of the present invention will be described with reference to the accompanying drawings. The thrust bearing according to the present invention is mounted mainly on a rotating part of an automobile transmission, an air conditioner compressor, a torque converter, or the like, and is used to apply an axial axial load (thrust load) applied to the rotating part. The case is assumed as an example, but the application is not limited to this. At that time, the bearing should be lubricated to reduce friction and wear, prevent seizure, or extend the fatigue life of the parts where the races and rolling elements (rollers and balls) and cages contact each other. (Grease lubrication, oil lubrication, etc.) is preferable.

  FIG. 1 shows the configuration of a thrust bearing according to an embodiment of the present invention. Such a bearing includes at least one bearing ring having a raceway surface and a plurality of rolling elements (rollers and balls) arranged along the circumferential direction with respect to the raceway surface. In this case, if at least one bearing ring is provided, a bearing can be formed. In this embodiment, however, the two bearing rings 2 and 4 can be rotated relative to each other as shown in FIG. It is assumed that the bearings are arranged opposite to each other. However, it is also possible to omit one of the two race rings 2 and 4 and to have a bearing configuration having only one race ring. Thus, when it is set as the bearing structure of one bearing ring, a raceway surface should just be formed in the other party member (for example, a shaft, a housing, etc.) so that the raceway surface of the said bearing ring can be opposed.

Of the two race rings, a race ring (hereinafter referred to as an outer diameter race ring) 2 disposed on one side in the axial direction (for example, the upper side in FIG. 1A) is a race surface (same as the outer diameter side). An annular track flat plate portion (referred to as an outer diameter side plane portion) 2a in which 2s is formed, and the other side in the axial direction from the outer peripheral edge portion of the outer diameter side plane portion 2a (for example, FIG. 1 (a) lower side) has an outer diameter side cylindrical portion 2b extending at a substantially right angle.
On the other hand, of the two race rings, a race ring (hereinafter referred to as an inner race ring) 4 arranged on the other side in the axial direction (for example, the lower side of FIG. An annular raceway flat plate portion (referred to as the inner diameter side plane portion) 4a formed with 4s, and one axial side from the inner peripheral edge portion of the inner diameter side plane portion 4a (as an example, It has an inner diameter side cylindrical portion 4b extending substantially at right angles to the upper side of FIG.

  In this case, both the outer diameter raceway ring 2 and the inner diameter raceway ring 4 are processed by pressing a thin plate material (for example, a plate thickness of about 0.5 mm to 1.0 mm) (for example, pressing or bending). It is molded so as to form a substantially L-shape. The outer diameter raceway ring 2 and the inner diameter raceway ring 4 are configured such that the outer diameter side plane portion 2a and the inner diameter side plane portion 4a, more specifically, the outer diameter side raceway surface 2s and the inner diameter side raceway surface 4s face each other. The outer diameter side cylindrical portion 2b is disposed on the outer diameter side (left side in FIG. 1A), and the inner diameter side cylindrical portion 4b is disposed on the inner diameter side (same as the right side), and is assembled so as to form a substantially rectangular shape in cross section. (FIG. 1 (a)). That is, the guide portion (outer diameter side cylindrical portion 2b) of the outer diameter raceway ring 2 is positioned on the outer diameter side (left side in FIG. 1A), and the guide portion of the inner diameter raceway ring 4 (inner diameter side cylindrical portion 4b). ) Is assumed to be on the inner diameter side (right side in the figure).

  Rolling elements (not shown) include rollers (needles with a roller length larger than the diameter (needle rollers) depending on the load capacity of the axial load required according to the purpose and mode of use of the thrust bearing. ) Or balls. At that time, the size (diameter) of rolling elements (rollers and balls), the number of assembly (number of arrangements), and the like can be arbitrarily set. In any case, the rolling elements are opposed to each other between the raceway surfaces 2s and 4s so that the outer peripheral surface (rolling surface) is brought into contact with the outer diameter side raceway surface 2s and the inner diameter side raceway surface 4s. What is necessary is just to arrange | position to a space (henceforth rolling space) by the predetermined space | interval (for example, equal intervals) along the circumferential direction (single row arrangement | positioning which makes single pitch circle diameter (PCD: Pitch Circle Diameter)). However, with respect to the rolling space between the outer diameter side raceway surface 2s and the inner diameter side raceway surface 4s, a plurality of rolling elements arranged on the same radiation (on the same phase with respect to the circumferential direction) are arranged along the circumferential direction. Bearing configurations arranged at a predetermined interval (for example, equal intervals) (that is, a double-row arrangement with different PCDs (for example, two-row arrangement with two PCDs)), and a plurality of rolling elements are arbitrarily scattered. It is also possible to assume a bearing configuration.

Note that the configurations of the outer diameter raceway ring 2 and the inner diameter raceway ring 4, for example, the radial width of the outer diameter side plane portion 2 a and the inner diameter side plane portion 4 a, and the axial direction of the outer diameter side cylindrical portion 2 b and the inner diameter side cylindrical portion 4 b. The length may be set according to the size and number of rolling elements (rollers and balls) arranged in the rolling space. Further, the extension angle of the outer diameter side cylindrical portion 2b with respect to the outer diameter side plane portion 2a and the extension angle of the inner diameter side cylindrical portion 4b with respect to the inner diameter side plane portion 4a are not particularly limited.
Further, the rolling elements (rollers and balls) may be disposed in the rolling space in a state of being rotatably held in a pocket formed in an annular cage (not shown). As a result, the rolling elements can roll in the rolling space without their rolling surfaces contacting each other, and as a result, the rolling elements come into contact with each other to generate friction. An increase in rotational resistance and seizure can be prevented.

  In the present embodiment, at least the outer surface of the raceway (outer diameter raceway ring 2 or inner diameter raceway ring 4) or the outer surface of the cylindrical part (the outer peripheral surface 20b of the outer diameter side cylindrical part 2b or the inner diameter side cylindrical part 4b). The inner peripheral surface 40b) is provided with a coating for providing an interference between the mating surface 10s of a mating member (for example, shaft or housing) 10 for temporarily fixing the thrust bearing by press fitting. It has been subjected. The outer surface is the surface of the bearing ring (outer diameter bearing ring 2 and inner diameter bearing ring 4) that is exposed to the outside rather than the inside of the bearing when the bearing ring is assembled as a bearing. The surface to be used is generally called. FIG. 1 illustrates a configuration of a bearing in which a predetermined coating 12 is applied only to the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b. In this case, the coating 12 extends over the entire inner circumferential surface 40b (the entire circumferential surface) (FIG. 1B) in the bearing press-fitting direction (the direction from bottom to top in FIG. 1A). On the other hand, the interference is substantially constant, in other words, it is applied with a substantially constant thickness (coating thickness) from one side in the axial direction to the other side (from the upper side to the lower side in the figure). In FIG. 1, for convenience, the thickness of the coating 12 (coating thickness) is exaggerated (the same applies to each of FIGS. 2 to 8), but the actual coating thickness is about 200 μm at the maximum. You only have to set it. At this time, the clearance (clearance, dimension s1 shown in FIG. 9) between the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b and the fitting surface 10s of the counterpart member 10 before applying the coating 12 is 100 to 150 μm. The case where it is set to about is assumed. That is, by applying the coating 12, the inner circumferential surface 40b of the inner diameter side cylindrical portion 4b has an interference of about 50 to 100 μm (dimension s2 shown in FIG. 8B) between the fitting surface 10s. Can be made.

The coating 12 can be applied with an arbitrary material, but in the present embodiment, the coating 12 is a solid lubricant or a solid rust preventive agent, specifically, either a solid lubricant or a solid rust preventive agent. One or both of them are assumed to be applied by attaching them to the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b or by applying an elastic material such as resin or rubber to the inner peripheral surface 40b. is doing.
In this manner, by applying the coating 12 to the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b, the inner peripheral surface 40b and the mating surface 10s of the mating member 10 have a predetermined interference ( In a wrapped state). In other words, the thrust bearing can be temporarily fixed to the counterpart member 10.

When the thrust bearing having the coating 12 applied to the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b is temporarily fixed to the counterpart member 10, for example, it may be performed as shown in FIG.
In this case, the thrust is set so that the continuous portion 4c of the inner diameter side plane portion 4a and the inner diameter side cylindrical portion 4b of the inner diameter raceway ring 4 is positioned on one side (upper side in FIG. 8) in the axial direction with respect to the counterpart member 10. The bearing and the mating member 10 are arranged ((a) in the figure). From this state, the thrust bearing and the mating member 10 are approached in the axial direction until the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b and the mating surface 10s of the mating member 10 are fitted via the coating 12. Then, the thrust bearing and the counterpart member 10 are relatively press-fitted (pressed) (FIG. 8B). At that time, when the coating 12 is applied with a solid lubricant or a solid rust preventive agent, a portion corresponding to the interference s2 of the coating 12 is scraped, and the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b and the mating member 10 From the fitting portion with the fitting surface 10s (see FIG. 8B). That is, the inner peripheral surface 40b and the fitting surface 10s are fitted in a state where the coating 12 is interposed in the clearance (clearance) s1 between the inner peripheral surface 40b and the fitting surface 10s. On the other hand, when the coating 12 is made of an elastic material such as resin or rubber, the inner peripheral surface 40b and the fitting surface are in a state where the portion corresponding to the interference s2 of the coating 12 is elastically deformed (expanded deformation). 10s will be fitted.

In any case, the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b and the mating surface 10s of the mating member 10 are fitted via the coating 12, and as a result, the thrust bearing is attached to the mating member 10. On the other hand, it can be temporarily fixed.
When the coating 12 is applied with a solid lubricant or a solid rust preventive agent, the coating 12 interposed between the inner peripheral surface 40b and the fitting surface 10s is peeled off (scraped) at the time of initial movement, and oil (oil) is used during normal operation. As a result, the coating 12 is melted, and the clearance (clearance) between the inner peripheral surface 40b and the fitting surface 10s is converged to a set value (for example, about 100 to 150 μm), that is, an optimum guide clearance can be secured. . Furthermore, if the coating 12 is applied with a solid lubricant, it is possible to effectively contribute to the initial lubrication.

Here, in the present embodiment, it is assumed as an example that the predetermined coating 12 is applied to only the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b (FIG. 1). If it is possible to have a predetermined interference (for example, about 50 to 100 μm) between the side member (for example, shaft or housing) and temporarily fix it by press fitting, coating The range, part, member, method, coating form, and the like to be applied are not particularly limited, and may be arbitrarily set according to the size of the thrust bearing, the material of the coating, and the like.
For example, as shown in FIGS. 2 and 3, the coating 12 may be applied not to the entire inner peripheral surface 40b of the inner diameter side cylindrical portion 4b but to a part thereof.
FIG. 2 shows a configuration example in which a plurality of coatings 12 are applied to the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b at predetermined intervals in the circumferential direction. In this case, the entire inner peripheral surface 40b is equally divided into approximately six peripheral surface regions with respect to the peripheral direction, and is arranged at substantially equal intervals (substantially 120 ° phase difference) in the peripheral direction of these peripheral surface regions. Three, all from one side of the axial direction to the other side (corresponding to the upper side to the lower side of Fig. 1 (a)), with a substantially constant thickness (coating thickness (or another way of interference)) The same coating 12 is applied.

3A shows a plurality of coatings 12 that are continuous over the entire circumference of the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b from one side in the axial direction to the other side (from the upper side to the lower side in the figure). ) Shows a configuration example performed at substantially equal intervals. In this case, the entire inner peripheral surface 40b is equally divided into approximately seven peripheral surface regions arranged in parallel from one side of the axial direction to the other side, and aligned in the axial direction of these peripheral surface regions at substantially equal intervals. The same coating 12 is applied to all four with a substantially constant thickness (coating thickness (or, if another way of thinking, interference)). That is, the four coatings 12 that are continuous over the entire circumference of the inner peripheral surface 40b are applied at equal intervals in the axial direction.
By adopting such a configuration, for example, when each coating 12 is applied with a solid lubricant or a solid rust preventive agent, when the thrust bearing and the counterpart member 10 are relatively press-fitted (pressed), the respective coatings Although the portion corresponding to the interference s2 of 12 is scraped (see FIG. 8B), the scraped portion enters between the adjacent coatings 12 in the axial direction (bearing press-fitting direction) (FIG. 3B). reference). For this reason, the amount of the coating 12 that peels off from the fitting portion between the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b and the fitting surface 10s of the mating member 10 is reduced, and the coating that dissolves with oil during normal operation. The amount of 12 can be reduced. Further, when the coating 12 is made of an elastic material such as resin or rubber, the portion corresponding to the interference s2 of the coating 12 is elastically deformed (expanded deformation), but the elastically deformed portion is axially deformed. Since it enters between the adjacent coatings 12, it becomes easier to relatively press-fit (press) the thrust bearing and the counterpart member 10 together.

Moreover, in the structure shown in FIGS. 1 to 3 described above, the structure of the coating 12 is applied with a substantially constant thickness (coating thickness). Although shown, the coating thickness (interference) may not be constant. For example, as shown in FIG. 4, the coating 12 is squeezed as it goes in the press-fitting direction of the bearing (the direction in which the bearing is press-fitted (pressed) against the mating member 10, the direction from the bottom to the top in the figure). It may be applied to increase the margin (in short, to increase the coating thickness). In FIG. 4 (a), the interference is gradually increased as the entire coating 12 is moved in the press-fitting direction of the bearing, in other words, the coating 12 is gradually inclined toward the inner side from the outer side of the bearing. A configuration example in which the coating 12 is tapered is shown. On the other hand, in FIG. 4 (b), the coating 12 is such that, in the entire coating 12, only the outer peripheral edge of the bearing is gradually creased toward the inside (the coating 12 is inclined). The example of a structure which gave only one part to the taper shape is shown.
By forming the coating 12 in such a tapered shape, when the thrust bearing and the counterpart member 10 are relatively press-fitted (pressed) (see FIG. 8B), the mating surface 10s of the counterpart member 10 is obtained. Can be smoothly guided along the taper portion of the coating 12, and press-fitting (pressing) is further facilitated.

  Also, in the configurations shown in FIGS. 1 to 4 described above, the configuration example in which the coating 12 is applied only to the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b in the outer surface of the bearing ring (the inner diameter raceway ring 4). However, if the coating 12 is applied to at least the inner peripheral surface 40b (that is, the surface portion fitted to the fitting surface 10s of the mating member 10), the coating 12 is wider than the inner diameter side cylindrical portion 4b. It may be applied over. For example, as shown in FIG. 5A, in addition to the entire outer surface of the inner diameter raceway ring 4, that is, the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b, Side surface) 40a and the outer bent surface 40c of the continuous portion (bent portion) 4c of the inner diameter side plane portion 4a and the inner diameter side cylindrical portion 4b may be coated. Alternatively, as shown in FIG. 5B, the coating 12 may be applied to the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b and the outer bent surface 40c of the continuous portion 4c among the outer surfaces of the inner diameter raceway ring 4. Good.

  In each of the configurations shown in FIGS. 1 to 5 described above, the guide portion of the raceway ring (inner diameter raceway ring) 4 is positioned on the inner diameter side, that is, the inner diameter side cylindrical portion 4b is replaced with the inner diameter side flat portion 4a. Although it is assumed that the shaft extends from the inner peripheral edge to one side in the axial direction (the upper side in FIG. 1A), as shown in FIG. The structure in which the guide portion is positioned on the outer diameter side, that is, the cylindrical portion (corresponding to the inner diameter side cylindrical portion 4b) is arranged on the one side in the axial direction (same as the inner diameter side flat portion 4a). A configuration extending upward) in the figure can be assumed. In this case, the coating 12 may be similarly applied to a predetermined portion of the outer surface of the raceway ring 4 on the outer surface including at least the outer peripheral surface 42b of the cylindrical portion 4b in the range and form as described above ( 1 to 5).

  Further, in each of the configurations shown in FIGS. 1 to 6 described above, the coating 12 is applied only to the outer surface (the inner peripheral surface 40b, the outer flat surface 40a, the outer bent surface 40c, etc.) of the inner diameter raceway ring 4 among the raceways. For example, when the counterpart member 10 for temporarily fixing the thrust bearing has a cylindrical shape, at least the outer diameter side cylindrical portion 2b of the outer surface of the outer diameter raceway ring 2 is shown. It is also possible to apply the coating 12 to a predetermined part in the same manner in the range and form as described above on the outer surface including the outer peripheral surface 20b (see FIGS. 1 to 6).

In any range, part, or member, whatever form of coating 12 is applied, the coating 12 can be a coating material (such as a paint such as a solid lubricant or a solid rust inhibitor, or an elastic material such as resin or rubber). ) May be applied to the outer surface of the bearing ring (as an example, the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b of the inner diameter raceway ring 4) by, for example, spraying, coating, pasting, injection, or the like. At that time, for example, when the coating material is applied by applying the above-described coating material, a predetermined masking is performed on a portion where the coating 12 does not need to be applied (such as an inner surface and an end surface of the race). The coating 12 may be applied only to the outer surface of the raceway.
FIG. 7 shows an example of an outline of a procedure in the case where the coating 12 is applied only to the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b among the outer surfaces of the inner diameter raceway ring 4. In this case, the outer surface (outer flat surface 40a and outer bent surface) excluding the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b with respect to the inner diameter raceway ring 4 before the coating 12 is applied (the state shown in FIG. 7A). 40c), the inner surface (inner plane of the inner diameter side plane portion 4a, the outer peripheral surface of the inner diameter side cylinder portion 4b), and the end surface (end surface of the inner diameter side plane portion 4a, end surface of the inner diameter side cylinder portion 4b) Masking is performed by the masking material 14 (state shown in FIG. 7B). And it adheres by apply | coating the above coating materials to the internal peripheral surface 40b of the internal diameter side cylindrical part 4b with respect to the internal diameter raceway ring 4 of the state which performed such masking (state shown in FIG.7 (c)). Thereby, this coating material can be made to adhere only to the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b to which the coating 12 needs to be applied. The masking material 14 may be removed after the coating 12 is fixed. In addition, when coating 12 is applied to a plurality of ranges or parts, the same coating material may be attached to all, or different coating materials (for example, solid lubricant and resin, etc.) are attached to any range or part. You may let them. In that case, all the forms of the coating 12 may be the same or different.

  As described above, according to the thrust bearing according to the present embodiment, without changing the shape of the bearing itself and the counterpart member 10 such as the shaft and the housing, the bearing ring set to the conventional inner diameter dimension or outer diameter dimension is used. The peripheral surface portion (for example, the inner peripheral surface 40b of the inner diameter side cylindrical portion 4b of the inner diameter raceway ring 4) is coated with a coating 12 such as a solid lubricant, a solid rust preventive, or an elastic material such as resin or rubber. By means of simple means, the mating member 10 can be temporarily fixed with an interference. As a result, it is possible to stabilize the bearing posture in the assembly process to the transmission, and to improve the workability.

2 Outer diameter raceway 2a Outer diameter side flat surface portion 2b Outer diameter side cylindrical portion 2s Outer diameter side raceway surface 4 Inner diameter raceway ring 4a Inner diameter side flat surface portion 4b Inner diameter side raceway surface 4s Inner diameter side raceway surface 10 Mating side member 10s Mating side member Mating surface 12 Coating 40b Inner peripheral surface s2 inner diameter side interference

Claims (10)

A thrust bearing comprising at least one bearing ring having a raceway surface and a plurality of rolling elements arranged along the circumferential direction with respect to the raceway surface,
The raceway ring has an annular raceway plate portion in which a raceway surface is formed, and an inner peripheral edge portion of the raceway flat plate portion, or a cylindrical portion extending from the outer peripheral edge portion to one side in the axial direction,
Of the outer surface of the raceway, at least the outer surface of the cylindrical portion has a coating for providing an interference between the thrust bearing and a mating surface of a mating member that temporarily fixes the thrust bearing by fitting. A thrust bearing characterized by being provided.   The thrust bearing according to claim 1, wherein the coating is applied by applying paint.   The thrust bearing according to claim 2, wherein a coating is applied by adhering either one or both of a solid lubricant and a solid rust preventive agent as the paint.   The thrust bearing according to claim 1, wherein the coating is applied by attaching an elastic material.   The thrust bearing according to any one of claims 1 to 4, wherein the coating is applied to at least the entire outer surface of the cylindrical portion of the outer surface of the raceway ring.   The thrust bearing according to any one of claims 1 to 4, wherein the coating is applied to at least a part of the outer surface of the cylindrical portion of the outer surface of the raceway ring.   The thrust bearing according to claim 6, wherein the coating is continuously applied over the entire circumference of the outer surface of the cylindrical portion.   The thrust bearing according to claim 6, wherein a plurality of the coatings are provided on the outer surface of the cylindrical portion at a predetermined interval in the circumferential direction.   The thrust bearing according to any one of claims 1 to 8, wherein the coating is applied so that the interference is substantially constant with respect to a press-fitting direction of the bearing.   The thrust bearing according to any one of claims 1 to 8, wherein the coating is applied so that the interference increases as it goes in a press-fitting direction of the bearing.

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