TW202037822A - Solid-lubricated rolling bearing - Google Patents

Abstract

A subject of the present invention is to provide a solid-lubricated rolling bearing capable of suppressing excessive wearing of solid lubricant and excessive transfer of solid lubricant to a rolling surface. A solid-lubricated rolling bearing 1 includes an inner ring 3, an outer ring 2, a plurality of rolling elements 4, at least one solid lubricant 7 located between adjacent rolling elements 4, and a cage 5 separating the rolling elements 4 in a circumferential direction, wherein the solid lubricant 7 located inside or outside of a pillar portion 5b of the cage 5 separating the rolling elements 4.

Description

Solid lubrication rolling bearings

The present invention relates to a rolling bearing equipped with a solid lubricant used in environments such as high temperature or vacuum.

Solid-lubricating rolling bearings are used under high-temperature atmospheres or vacuum atmospheres where grease or lubricant cannot be used as lubricants.

With regard to this kind of solid lubrication rolling bearing, the following solid lubrication rolling bearings are known in the past: without using a cage, a solid lubricant is arranged between adjacent rotating bodies, and the solid lubricant will slide with the rotating body or the track wheel. Therefore, the lubricant transfers and adheres to the counterpart parts or generates lubricant powder to lubricate the inside of the bearing (Patent Documents 1 and 2).

[Prior Technical Literature]

[Patent Literature]

Patent Document 1: Japanese Patent No. 6275433

Patent Document 2: Japanese Patent No. 3550689

However, any of the aforementioned conventional structures will deviate from the position of the rotating body in the circumferential direction due to the abrasion of the solid lubricant, so there is a possibility that the rotation and swing accuracy of the bearing will deteriorate. In addition, since the inertial force of the rotating body acts on the solid lubricant, the solid lubricant may be excessively worn and the life of the bearing may be shortened.

Therefore, the present invention provides a rolling bearing provided with a solid lubricant, even if the solid lubricant is worn, the deviation of the rotating body will not occur, and the interference force between the rotating body and the solid lubricant can be suppressed.

In order to solve the aforementioned problems, the present invention is in a rolling bearing having an inner ring, an outer ring, a plurality of rotating bodies, at least one solid lubricant between the rotating bodies, and a retainer that separates the rotating bodies in the circumferential direction. , The following structure is adopted: the solid lubricant is located inside or outside the column of the holder separating the rotating body.

With this structure, since the circumferential position of the rotating body is determined by the position of the pocket of the holder, even if the solid lubricant is worn, there will be no deviation of the rotating body, and the rotation and swing accuracy of the bearing will not be deterioration. Furthermore, the interference force between the rotating body and the solid lubricant is not generated by the rotating body, but by the inertial force of the solid lubricant with a small mass, so that the abrasion speed of the solid lubricant is reduced.

Furthermore, it is also configured such that when the solid lubricant is sandwiched by two adjacent rotating bodies with the solid lubricant interposed therebetween, there is a gap in the circumferential direction between the two rotating bodies and the column of the retainer located therebetween ; In this way, sufficient lubricant is supplied to the inside of the bearing at the beginning of operation. That is, by making the initial circumferential dimension of the solid lubricant larger than the circumferential dimension of the column of the retainer, In the early stage of operation, the inertial force of the rotating body acts on the solid lubricant, and the solid lubricant is actively worn. Then, when the solid lubricant wears and becomes smaller than the circumferential dimension of the column portion, it shifts to a stage where the interference force between the rotating body and the solid lubricant is suppressed.

In addition, by making the retainer to support and guide a part or all of the end faces of the solid lubricant, the end faces of the solid lubricant will not slide on peripheral parts such as the sealing plate, and the wear speed can be further reduced.

In addition, by making the width dimension of the solid lubricant to have a press-fitting and marginal structure relative to the retainer, the two can be sub-assembly, and the rationality of the assembly of the bearing can be improved.

Furthermore, it is also configured that the holder is a comb-shaped holder composed of a circular ring portion and a plurality of pillars extending in the axial direction from the circular ring portion, and the comb front end side of the pocket portion of the rotating body is made The size of the opening is smaller than the diameter of the rotating body; thereby, the positioning of the retainer in the axial direction is not dependent on the peripheral parts such as the sealing plate. That is, the shape of the pocket viewed from the diameter direction of the holder is made into a hip flask shape to accommodate the rotating body, and the rotating body is configured to restrict the movement of the holder in the axial direction.

In addition, by making the post of the holder a slit opening toward the front end of the comb, in the assembly of the bearing, the holder is inserted between the inner ring and the outer ring as it is press-fitted. In the case of the rotating body, it is easy to elastically deform the column, so in addition to improving the assembly of the bearing, it also suppresses the plastic deformation of the cage.

As described above, according to the present invention, even if the solid lubricant is abraded, there will be no deviation of the rotating body, so it is possible to provide a solid that does not deteriorate the accuracy of rotation and swing Lubricate the rolling bearings. In addition, since the interference force between the rotating body and the solid lubricant can be suppressed, it is possible to provide a long-life solid-lubricated rolling bearing that suppresses excessive wear of the solid lubricant.

1: Sealed deep groove ball bearings, bearings

2: outer ring

2a: Side track surface

3: inner ring

3a: Inside track surface

4: rotating body

5: retainer

5a: Ring part

5b: Column

5c: Bag part

5d: slit

6: Sealing plate

7: Solid lubricant

8: Ring plate

9: Open deep groove ball bearings, bearings

W: opening size

W1: width size

W2: width size

C: gap

D: diameter

Fig. 1 is a perspective view of an embodiment in which the present invention is applied to a sealed deep groove ball bearing and a part of it is removed.

Figure 2 is a perspective view of the retainer unit of the bearing of Figure 1;

Figure 3 is a partial cross-sectional view of the bearing of Figure 1 divided in the axial direction.

Figure 4 is a partial side view of the bearing of Figure 1.

Fig. 5 is a perspective view showing an embodiment to which the open-shaped deep groove ball bearing of the present invention is applied and a part is removed.

Fig. 6 is a perspective view of the single holder of Fig. 5.

Figure 7 is a radial cross-sectional view of the bearing of Figure 5;

Figure 8 is a diagram showing the assembly process of the bearing of Figure 5;

Fig. 9 is a perspective view of a single holder with U-shaped slits on the column of the holder of Fig. 6;

Hereinafter, the embodiments of the present invention will be described based on the drawings.

Figures 1 to 9 show an embodiment of applying the present invention to a sealed deep groove ball bearing.

Fig. 1 is a perspective view of a sealed deep groove ball bearing 1 to which the present invention is applied. For convenience, the outer ring 2 and the sealing plate 6 are shown with half of the front side of the paper removed.

The bearing 1 includes: an outer ring 2 with an outer raceway surface 2a on the inner peripheral surface, an inner ring 3 with an inner raceway surface 3a on the outer peripheral surface, a rotor 4, a solid lubricant 7 between the rotors 4, and The rotating body 4 is spaced in the circumferential direction of the retainer 5, and on the opposite side of the ring portion 5a of the retainer 5 in the axial direction, the ring plate 8 has the same shape as the aforementioned ring portion 5a, and is on both sides of the outer ring 2. A sealing plate 6 is fixed on the side.

The aforementioned sealing plate 6 has its outer diameter end press-fitted and fixed to the circumferential groove formed on the inner peripheral surface of the outer ring 2, and its inner diameter end is close to the outer peripheral surface of the inner ring 3 to form a non-contact seal. In addition, in bearings that are not used in a high-temperature environment, as for the sealing plate 6, a contact seal type in which the inner diameter end is slidably connected to the outer peripheral surface of the inner ring 3 can also be used.

The outer ring 2, the inner ring 3, the retainer 5, and the circular ring plate 8 are formed of a steel material, such as Asada loose iron stainless steel such as SUS440C. The rotating body 4 is formed of ceramics. For ceramics, for example, silicon nitride can be used. When the rotor 4 is not formed of ceramics, it is preferable to form a film made of a solid lubricating material such as graphite on the surface. The sealing plate 6 is formed of a steel material, and is preferably formed of austenitic stainless steel such as SUS304 with good corrosion resistance.

The retainer 5 is a comb-shaped retainer composed of a circular ring portion 5a and six column portions 5b extending in the axial direction from the outer diameter side of the circular ring portion 5a. The pocket portion 5c that accommodates the rotor 4 is formed in a substantially U-shape (a partially narrow pot shape) penetrating in the radial direction, and the outer diameter surface of the column portion 5b is formed as a partial cylindrical surface corresponding to the inner diameter surface of the outer ring 2 .

Here, the solid lubricant 7 is located inside the column portion 5b of the holder 5, so the arrangement of the rotating body 4 will not change due to the wear of the solid lubricant 7.

In addition, the holder 5 can also be constituted by the circular ring portion Sa and the six column portions 5b extending in the axial direction starting from the inner diameter side of the circular ring portion 5a. At this time, the inner diameter surface of the column portion 5b forms a partial cylinder corresponding to the outer diameter surface of the inner ring 3, and the solid lubricant 7 is located outside the column portion 5b of the retainer 5.

The solid lubricant 7 is composed of a solid lubricant material such as graphite, tungsten disulfide, or molybdenum disulfide, and is formed in a plate shape that is curved along the shape of the track wheel,

3 is a partial cross-sectional view of the bearing 1 of FIG. 1 divided in the axial direction, and shows a state in which the solid lubricant 7 is clamped by two adjacent rotating bodies 4 with the solid lubricant 7 interposed therebetween. At this time, it is as follows: between the two rotating bodies 4 and the column part 5b of the holder 5 located therebetween, there is a gap C in the circumferential direction, and the rotating body 4 interacts with the solid lubricant 7 more actively than the column part 5b. The composition of contact.

Fig. 4 is a side view of the bearing 1 in Fig. 1. For convenience, the sealing plate 6 and the ring plate 8 in front of the paper are omitted, and a part of the rotating body 4 is shown in broken lines. Here, the opening size W of the pocket portion 5c of the rotor 4 of the accommodating holder 5 is smaller than the diameter D of the rotor 4, and the shape of the pocket portion 5c when viewed from the radial direction is a partially narrow pot shape.

Next, FIG. 5 is a perspective view of the open-shaped deep groove ball bearing 9 to which the present invention is applied. For convenience, the outer ring 2 is shown with half of the front side of the paper removed. The parts that are common to the embodiments shown in FIGS. 1 to 4 are given the same reference numerals, and the description is omitted as appropriate.

The bearing 9 has, like the bearing 1, an outer ring 2 and an inner ring 3 made of stainless steel, a rotor 4 made of ceramics, a solid lubricant 7 composed of a graphite-based solid lubricating material located between the rotors 4, And a retainer 5 made of stainless steel that separates the rotor 4 in the circumferential direction.

Fig. 6 is a perspective view of the retainer 5 alone of the bearing 9 of Fig. 5, and has a shape in which the column portion 5b of the retainer 5 of Fig. 2 is extended and the front end is bent inward.

FIG. 7 is a radial cross-sectional view of the bearing 9 of FIG. 5, which is configured such that the cross-sectional shape of the column portion 5b of the retainer 5 is formed in a U shape, and supports and guides a part of the two end surfaces of the solid lubricant 7. In addition, it is also configured that the width dimension W1 of the solid lubricant 7 is only slightly larger than the width dimension W2 of the U shape of the cage 5, and the solid lubricant 7 can be pressed into the cage 5. In addition, the press-fitting and retaining edge will bear the interference force from the rotating body 4 generated by the rotation of the bearing 9 and abrasion and abrasion, so that the solid lubricant 7 can also be in the circumferential direction on the inner side of the column 5b of the retainer 5 Swimming.

Fig. 8 is a diagram showing the assembly process of the bearing 9 in Fig. 5, and the retainer 5 and the solid lubricant 7 which are subassembly are inserted toward the rotating body 4 arranged between the outer ring 2 and the inner ring 3 Time map. The holder 5 grasps the rotor 4 according to the lead-in chamfer provided in the opening of the pocket 5c, and while elastically deforming the opening size W, it is inserted in the axial direction.

Fig. 9 is a partial modification of the retainer 5 of the bearing 9 of Fig. 5, and a U-shaped slit 5d that opens toward the front end of the comb is provided in the column portion 5b.

In addition, the present invention is not limited to ball bearings, but can also be applied to roller bearings. Furthermore, the material or shape of the component parts is not limited to the above. In addition to stainless steel or bearing steel balls, tungsten disulfide or molybdenum disulfide solid lubricants, cylindrical members can also be used The mechanism holder formed by turning processing.

1: Sealed deep groove ball bearings, bearings

2: outer ring

2a: Outer track surface

3: inner ring

4: rotating body

5: retainer

5b: Column

5c: Bag part

6: Sealing plate

7: Solid lubricant

8: Ring plate

Claims (6)

A solid-lubricating rolling bearing has an inner ring, an outer ring, a plurality of rotating bodies, at least one solid lubricant between the rotating bodies, and a retainer that separates the rotating bodies in the circumferential direction, wherein the solid lubricant is positioned On the inside or outside of the column of the holder that separates the rotating body. The solid-lubricated rolling bearing according to claim 1, wherein when the solid lubricant is clamped by two rotating bodies adjacent to each other via the solid lubricant, the two rotating bodies and the column part of the cage located between There is a circumferential gap between them. The solid lubrication rolling bearing according to claim 1 or 2, wherein the retainer supports and guides a part or all of the two end surfaces of the solid lubricant. The solid lubrication rolling bearing according to claim 3, wherein the width dimension of the solid lubricant has a press-in margin with respect to the cage. The solid-lubricating rolling bearing according to claim 1 or 2, wherein the cage is a comb-shaped cage composed of a circular ring portion and a plurality of column portions extending in the axial direction from the circular ring portion, and contains a rotating body The opening size of the front end of the comb in the pocket is smaller than the diameter of the rotating body. The solid-lubricating rolling bearing according to claim 5, wherein the column of the retainer has a slit that opens toward the front end of the comb.

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