JPH0512492Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> This invention relates to a solid lubricated ball bearing.

<Prior Art> Conventionally, there is a ball bearing shown in FIG. 3 (Japanese Utility Model Application No. 59-171221). This ball bearing 1 has a nut body 3 interposed with a plurality of balls 5, 5, etc., and a threaded portion 21 is screwed into the nut body 3. Inside the nut body 3, a circulation tube 6 is provided in a spiral shape. Then, due to the rotation of the shaft 2, the balls 5, 5... are moved into the groove 2 of the threaded part 21.
1a, and passes through the circulation tube 6 again to the groove 21a of the threaded portion 21.
, and circulates between the groove 21a and the circulation tube 6.

<Problems to be solved by the invention> However, in the conventional ball bearing described above, a solid lubricant is sealed in the circulation tube 6, and as shown in FIG. Since wear particles of the solid lubricant are collected in a plurality of recesses 7 provided in the inner wall 61 so as to protrude from the inside to the outside, the balls 5,
5... passes through the concave portion 7 of the circulation tube 6, a large amount of powder lubricant may be transferred to the balls 5, 5... at once, and the lubricant transferred to the balls 5, 5... There is a problem that the amount of the agent varies.

In addition, in the conventional ball bearing described above, the solid lubricant is sealed in the circulation tube 6 as described above, so when replacing or replenishing the solid lubricant, the entire circulation tube 6 must be replaced. Must. Therefore, there is a problem that maintenance costs become high.

Therefore, the purpose of this invention is to obtain good lubrication by constantly transferring an appropriate amount of lubricant to the balls passing through the circulation passage, and to also transfer only this solid lubricant when the solid lubricant wears out. The object of the present invention is to provide a replaceable solid lubricated ball bearing.

<Means for Solving the Problems> In order to achieve the above object, the solid lubrication type ball bearing of this invention has one of the parts of the circulation passage 11 that does not receive the load, as illustrated in FIG. An opening 12 is formed in the circulation passage 11, and a portion of the opening 12 of the circulation passage 11 is filled with the solid lubricant so that a mass consisting only of the solid lubricant 14 is exposed in the circulation passage. It is characterized in that the balls 15 are covered with the solid lubricant 14 from the outside so that the balls 15 are brought into contact with the solid lubricant 14.

<Function> The balls 15, 15, . . . circulating in the circulation passage 11 reach the opening 12. ball 15,
15 contact the solid lubricant 14 that covers the opening 12 and is exposed to the circulation passage 11 at the location of the opening 12 . The solid lubricant 14 is transferred to the outer surfaces of the balls 15, 15, . . . to form a lubricating film. In this way, the formation of a lubricating film on the balls 15, 1
5... and the solid lubricant 14 in the form of a lump, an appropriate amount of the solid lubricant 14 can be transferred to the outer surface of the balls 15, 15... At this time, since no load is applied to the balls 15, 15, . . ., the solid lubricant 14 wears out slowly, and wear particles are less likely to be produced. Also, the solid lubricant 14 is applied to the opening 12 of the circulation passage 11.
Since this portion is covered and fixed from the outside, the structure of the circulation tube that forms the part of the circulation passage 11 that does not receive the load is simplified, and the solid lubricant 14 can be easily attached. Further, when replacing the solid lubricant, it is sufficient to remove only the solid lubricant from the circulation tube and replace it, and the circulation tube itself can be used as is.

<Embodiment> FIG. 1 is a detailed view of a circulation passage which is a main part of a solid lubricated ball bearing according to an embodiment of this invention. This circulation passage 11 is used in the conventional ball bearing 1 shown in FIG. The circulation passage 11 is constituted by a circulation tube. In this circulation tube 11, openings 12, 12 are provided by cutting out two places on the wall surfaces facing each other in the vertical direction in the figure. A solid lubricant 14 that covers the outer periphery of the circulation tube 11 is fixed to the openings 12, 12 of the circulation tube 11. This solid lubricant 14 is a composite material that forms a mass consisting of a soft metal such as gold, silver, tin, etc. and a layered compound obtained by sintering molybdenum disulfide, tungsten disulfide, etc., and has a lubricating function. . A plurality of openings 12 and solid lubricants 14 of the circulation tube 11 are provided along the axial direction of the circulation tube 11 at regular intervals. No load is applied to the balls 15, 15, . . . within the circulation tube 11.

Therefore, the balls 15, 15... pass through the circulation tube 11 and enter the opening 12,
12, the balls 15, 15... contact the solid lubricant 14, and the solid lubricant 14 contacts the balls 15, 1.
5... and forms a lubricating film on the outer surface. In this way, the lubricant transferred to the outer surface of the balls 15, 15... is the solid lubricant 14 that forms a mass.
Since it is transferred from the source, the appropriate amount is always transferred, and there is no variation in the amount transferred. In this way, the balls 15, 15, on which a lubricating film has been formed, pass through the circulation tube 11 to the threaded portion 21 of the shaft 2.
The shaft 2 and the nut body 3 roll through the groove passage 21a of the
It also provides lubrication between the

As described above, since the solid lubricant 14 is fixed to the outside of the circulation tube 11, the solid lubricant 14 can be easily attached. Also, the balls 15, 15... contact the solid lubricant 14 forming a mass, and the solid lubricant 14 is transferred to the ball 1.
Since the solid lubricant 14 is transferred to the outer surfaces of the balls 15, 15..., an appropriate amount of the solid lubricant 14 can always be transferred to the balls 15, 15.... Further, since the balls 15, 15, . . . contact the solid lubricant 14 in an unloaded state, the solid lubricant 14 does not wear out quickly.

FIG. 2 shows another embodiment. This embodiment is a solid lubricated ball bearing 20 in which the shaft 21 moves in the thrust direction. The ball 1 is inserted into the circulation passage 24 between the shaft 21 and the nut body 22.
5, 15... are not in contact with the shaft 21 and do not receive any load. A solid lubricant 25 is arranged to cover the balls 15, 15, . . . from the outside so that an appropriate amount of the lubricant is transferred.

<Effects of the invention> As is clear from the above explanation, according to this invention, an opening is formed in a part of the circulation passage that does not receive the load, and this opening is filled with solid lubricant only. The ball is covered with the solid lubricant from the outside so that the mass is exposed in the circulation passage, and the ball is in contact with the solid lubricant, so that an appropriate amount of solid lubricant is always applied to the outside of the ball. It can be transferred to the surface to form a lubricating film. Moreover, since the balls come into contact with the solid lubricant under no load, the rate of wear of the solid lubricant is slow and lubricant can be supplied for a long period of time. moreover,
Since the solid lubricant does not contain any metal such as a metal core, there is no risk of damaging the balls even if the solid lubricant wears out to some extent.

Further, according to this invention, since the solid lubricant is fixed outside the opening, the solid lubricant can be easily attached. Furthermore, when replacing the solid lubricant, it is only necessary to replace the solid lubricant hole, which is advantageous in terms of maintenance.

[Brief explanation of the drawing]

Fig. 1 is a detailed sectional view showing the main part of one embodiment of this invention, Fig. 2 is a sectional view showing another embodiment, and Fig. 3 is a sectional view showing the main part of one embodiment of this invention.
The figure is a partial sectional view showing a conventional example, and FIG. 4 is an external view of a conventional circulation tube. 2...Shaft, 3...Nut body, 11, 24...
Circulation passage, 12...opening, 1
4, 25...Solid lubricant, 15...Ball.

Claims (1)

[Claims for Utility Model Registration] In a ball bearing equipped with a circulation passage for circulating balls, an opening is formed in a part of the circulation passage that does not receive the load, and the circulation passage The opening portion of the circulation passage is covered with the solid lubricant from the outside so that a mass made only of the solid lubricant is exposed in the circulation passage, and the balls are brought into contact with the solid lubricant. A solid lubricated ball bearing characterized by: