JP6357782B2 - Tapered roller bearing - Google Patents

Description

  The present invention relates to a tapered roller bearing suitably used for various industrial devices such as robot joints, and more particularly to a structure of a solid lubricant such as a lubricant-containing polymer filled in a bearing inner space of the tapered roller bearing.

  Conventionally, a lubricant-containing polymer-filled rolling bearing is known (see, for example, Patent Document 1). FIG. 4 is a view showing a lubricant-containing polymer-filled rolling bearing disclosed in Patent Document 1. As shown in FIG.

  As shown in FIG. 4, the lubricant-containing polymer-filled rolling bearing 130 is capable of rolling the inner ring 131 and the outer ring 132, a plurality of tapered rollers 133 interposed between the inner ring 131 and the outer ring 132, and the tapered rollers 133. And a retainer 134 that protrudes outward from the bearing 130 from the end surfaces of the inner ring 131 and the outer ring 132. In a bearing space formed by the inner ring 131, the outer ring 132, the tapered roller 133, and the cage 134, a lubricant-containing polymer 135 is filled and solidified.

JP 2000-192970 A

  However, in the conventional lubricant-containing polymer-filled rolling bearing 130 described above, the outer surface of the inner ring large collar is used as a mold dividing surface for molding the lubricant-containing polymer (hereinafter referred to as a solid lubricant) 135. Therefore, after molding, a thin burr of solid lubricant remains on the outer diameter surface of the inner ring large collar. As a result, there is a concern that the solid lubricant burrs may be caught in the bearing inner ring due to the sliding of the bearing and the sliding resistance of the bearing may increase.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a tapered roller bearing capable of suppressing burrs caused by molding of a solid lubricant and reducing the sliding resistance of the bearing. The purpose is to do.

Therefore, in order to solve the above problems, the present invention includes an outer ring having a rolling surface on an inner diameter surface, a rolling surface on the outer diameter surface, and a small ridge and a large ridge provided on both ends of the rolling surface. An inner ring provided, a plurality of tapered rollers interposed between the inner ring and the outer ring, and holding the tapered rollers in a rollable manner, and outward of the bearing from one end face of the inner ring or the outer ring. In the tapered roller bearing comprising: a cage protrudingly provided; and the inner ring, the outer ring, the tapered roller, and a solid lubricant filled in a bearing space formed by the cage, the solid lubricant Is a first surface that is flush with the side edge of the inner ring, a second surface that covers the entire outer diameter surface of the large collar, and the outer ring from a predetermined position on the tapered roller side relative to the first surface. A third surface facing toward the side, and the first surface and the third surface In that to form a stepped flange portion and said.

The second invention is such that a protective cover provided with a flange around the disc-shaped body is fitted to the bearing end face side so as to cover the inner ring large collar portion and the solid lubricant. Features.

  In addition, as a specific example of the solid lubricant, a raw material prepared by mixing a lubricant in the form of a single oil or a mixed oil with a synthetic resin selected from the group of polyolefin-based resins, the melting point of the synthetic resin or higher And plasticized by heating, and then cooled to solid form.

  The polyolefin resin is a group having basically the same chemical structure such as polyethylene, polypropylene, polybutylene, polymethylpentene and the like. As the lubricant, paraffinic hydrocarbon oil such as poly-α-olefin oil, naphthenic hydrocarbon oil, mineral oil, ether oil such as dialkyldiphenyl ether oil, ester oil such as phthalate ester, etc. Mixed. Various additives such as antioxidants, rust inhibitors, antiwear agents, antifoaming agents, and extreme pressure agents may be added in advance to the lubricating oil.

  According to the tapered roller bearing having the above-described configuration according to the present invention, generation of burrs of the solid lubricant can be suppressed. Therefore, the bearing inner ring can be prevented from biting the solid lubricant burrs, and the sliding resistance of the bearing can be reduced.

It is principal part sectional drawing which shows the rolling bearing which concerns on embodiment of this invention. It is principal part sectional drawing which shows the rolling bearing which concerns on the 2nd Embodiment of this invention. It is principal part sectional drawing which shows the rolling bearing which concerns on the 3rd Embodiment of this invention. It is principal part sectional drawing which shows the conventional rolling bearing.

  Hereinafter, first and second embodiments of tapered roller bearings according to the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of a main part showing a first embodiment of a tapered roller bearing of the present invention. As shown in FIG. 1, the tapered roller bearing 10 according to the first embodiment of the present invention includes an inner ring 11 and an outer ring 12, a plurality of tapered rollers 13 interposed between the inner ring 11 and the outer ring 12, and a tapered roller 13. And a retainer 14 provided so as to protrude outward from the end faces of the inner ring 11 and the outer ring 12. A bearing space formed by the inner ring 11, the outer ring 12, the tapered roller 13, and the cage 14 is filled and solidified with a solid lubricant 15 such as a lubricant-containing polymer, and each part of the bearing 10 is filled with the solid lubricant 15. Good lubricity of the raceway surface, rolling surface, collar surface, etc. is ensured.

  As shown in FIG. 1, the inner ring 11 is provided with large flanges 11a and small flanges 11b at both ends of the rolling surface on which the tapered rollers 13 roll, and the side portion (the right side in FIG. 1) of the bearing 10 is the outer ring. The end face of the inner ring protrudes in the bearing axial direction with respect to the end face. The solid lubricant 15 is in close contact over the entire outer diameter surface 11c of the large collar 11a that forms part of the protruding portion of the inner ring. And the bearing axial direction edge part (bearing right side in FIG. 1) of the solid lubricant 15 has the inclined surface 15a as it goes to radial direction from the bearing inner ring side to the bearing outer ring side.

  The operation of this embodiment will be described. In the tapered roller bearing 10 of the present embodiment, since the solid lubricant 15 is formed over the entire outer diameter surface 11c of the inner ring large collar 11a, the mold surface at the time of molding the solid lubricant is directed outward of the bearing. It is necessary to set. Thereby, it is possible to prevent the occurrence of thin burr of the solid lubricant on the bearing inner region, particularly on the outer diameter surface of the inner ring collar. Further, the bearing inner ring can be prevented from biting the solid lubricant burrs, and the sliding resistance of the bearing can be reduced.

Next, 2nd Embodiment of the tapered roller bearing of this invention is described based on FIG.
FIG. 2 is a cross-sectional view of a main part showing a second embodiment of the tapered roller bearing of the present invention.

  As shown in FIG. 2, the tapered roller bearing 30 according to the second embodiment of the present invention has a flange portion at a part on the bearing axial end portion side of the solid lubricant 35 that is in close contact with the large outer diameter surface 31 a of the inner ring 31. 35a is formed so as to be flush with the inner ring side end (right side in FIG. 2). Other configurations and operations are the same as those in the first embodiment.

  By adopting this embodiment, it is possible to prevent the occurrence of burrs of the solid lubricant on the bearing inner region, particularly on the outer diameter surface of the inner ring collar. Further, the bearing inner ring can be prevented from biting the solid lubricant burrs, and the sliding resistance of the bearing can be reduced.

  Next, 3rd Embodiment of the tapered roller bearing of this invention is described based on FIG. FIG. 3 is a cross-sectional view of an essential part showing a third embodiment of the tapered roller bearing of the present invention.

  As shown in FIG. 3, the tapered roller bearing of the third embodiment of the present invention covers the large collar portion of the inner ring 31 and the solid lubricant 35 in a comprehensive manner with respect to the bearing of the second embodiment. In addition, a protective cover 20 provided with a flange 20b around the disc-shaped main body 20a is fitted to the bearing 10 from the bearing end face side (right side in FIG. 3).

  By adopting this embodiment, leakage of the lubricant to the outside of the bearing can be suppressed, and foreign matters from the outside of the bearing can be prevented. As a result, early deterioration of the bearing can be prevented, which can contribute to a longer life. Further, it goes without saying that the protective cover is effective even when applied to the first embodiment of the present invention instead of the present embodiment.

DESCRIPTION OF SYMBOLS 10 ... Tapered roller bearing 11 ... Inner ring 12 ... Outer ring 13 ... Tapered roller 14 ... Cage 15 ... Solid lubricant

Claims (2)

An outer ring having a rolling surface on the inner diameter surface, an inner ring having a rolling surface on the outer diameter surface and small and large ridges provided at both ends of the rolling surface, and an intermediate ring between the inner ring and the outer ring. A plurality of tapered rollers to be mounted, the tapered rollers to be rollable, and a cage provided to project outward from the end face of one of the inner ring and the outer ring, the inner ring, In a tapered roller bearing including an outer ring, the tapered roller, and a solid lubricant filled in a bearing space formed by the cage, the solid lubricant is flush with a side end portion of the inner ring. A first surface, a second surface that covers the entire outer diameter surface of the large bowl, and a third surface that faces the outer ring side from a predetermined position on the tapered roller side with respect to the first surface. JP that forms a stepped flange portion between the first surface and the third surface Tapered roller bearings to be. A disc-shaped main body and a protective cover provided with a flange around the main body are fitted on the bearing end surface side so as to cover the large bowl and the solid lubricant. The tapered roller bearing according to Item 1 .

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