JPH0635655U - Rolling bearing lubricator - Google Patents

Abstract

(57) [Summary] [Purpose] A small amount of lubricant can be supplied during operation to improve the lubrication life, prevent heat generation, and simplify processing. [Structure] A lubricant reservoir space 6 composed of a circumferential groove is provided on an inner diameter surface of the inner ring 2, and a through hole 7 is provided which opens from the space 6 to a raceway surface 2b of the inner ring 2. A pin 9 is press-fitted into the through hole 7, and a lubricant outflow passage 10 having a minute gap is formed on a fitting surface between the pin 9 and the through hole 7. The minute gaps are formed by surface roughness on the mating surfaces, minute grooves formed on the pin surface, and the like. The lubricant reservoir space 6 may be provided in the inner ring spacer adjacent to the inner ring 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rolling bearing lubrication device which naturally supplies a lubricant such as grease filled in a lubricant reservoir space with operation.

[0002]

[Prior art]

 Bearings used for high-speed rotating shafts such as machine tool spindles are operated by applying a small amount of grease near the raceway surface when using grease lubrication. This amount of grease is limited to a small amount in order to suppress heat generation of the bearing due to stirring resistance as much as possible. Therefore, it cannot be expected that the lubricating life will be extended.

As a measure for improving the lubrication life of grease lubrication, for example, a grease reservoir is provided in the cage or the inner ring spacer, and the grease or its base oil is naturally supplied from the pores to the raceway surface by the centrifugal force accompanying the rotation of the shaft. Things have been proposed.

[0004]

[Problems to be solved by the device]

 However, when it is made to flow out from the pores, it is difficult to obtain a sufficient effect of restricting the flow rate due to the processing limit of the pore diameter. Therefore, the effect of improving the lubricating life by supplying a small amount of lubricant cannot be satisfied.

An object of the present invention is to provide a rolling bearing lubrication device capable of supplying a small amount of lubricant, improving the lubrication life and preventing heat generation, and easy to process.

[0006]

[Means for Solving the Problems]

 According to another aspect of the present invention, there is provided a lubricant bearing space in an inner ring, a through hole is provided in the inner ring near a raceway surface of a rolling element, and a pin fitted into the through hole and the through hole are provided. A lubricant outflow passage with a minute gap is formed on the fitting surface with the hole. The minute gap is formed by the surface roughness of the mating surface, the minute groove provided on the pin surface, or the like. The rolling bearing lubrication device according to the invention of claim 2 is provided with a lubricant reservoir space in the inner ring spacer, and a through hole is opened from this space to the vicinity of the raceway surface of the rolling element, and the through hole is different from the case of claim 1. Similarly, pins are fitted together to form a lubricant outflow passage with a minute gap on the fitting surface.

[0007]

[Action]

 According to the constructions of claims 1 and 2, the lubricant or its components filled in the lubricant reservoir space is discharged from the lubricant outflow passage at the fitting surface of the pin and the through hole to cause the capillary phenomenon or the inner ring. It is naturally supplied to the raceway surface by the centrifugal force accompanying the rotation. As a result, the lubrication life is improved and the amount of initial lubricant applied to the raceways is reduced to prevent heat generation. The outflow rate can be adjusted by adjusting the surface roughness of the mating surface, the interference of the mating surface, or the small groove on the pin surface. Therefore, the outflow rate can be easily adjusted by simple processing, and the outflow rate can be minimized.

[0008]

【Example】

An embodiment of this invention will be described with reference to FIG. This embodiment is an example applied to a single-row cylindrical roller bearing, and corresponds to claim 1. In the bearing 1, a rolling element 5 held by a cage 4 is interposed between an inner ring 2 having a collar 2a and an outer ring 3 having no collar. Two lubricant reservoir spaces 6 consisting of circumferential grooves are formed on the inner diameter surface of the inner ring 2, and radial through holes 7 are formed at a plurality of circumferential positions from each lubricant reservoir space 6 to the raceway surface 2b. It is provided so as to penetrate through the polishing stoves 8 on both side edges. A straight shaft-shaped pin 9 is press-fitted into each through-hole 7, and a lubricant outflow passage 10 having a minute gap generated by surface roughness (for example, R _MAX 0.2 to 5 μm) is formed on the fitting surface thereof. There is. The pin 9 may be a pin having a stopper collar 9a as shown in FIG. 2A or a taper pin 9'of FIG. 2B. When the taper pin 9'is used, the through hole 7 is also tapered according to the pin 9 '.

A lubricant 11 is filled in each lubricant reservoir space 6. As the lubricant 11, in addition to general semi-solid or solid grease, liquid grease, plastic grease, oil-containing resin, woven cloth containing felt, felt, or the like can be used. Plastic grease is a composition in which a mixture of a resin such as ultra-high-molecular-weight polyethylene or ultra-high-molecular-weight polyolefin and grease is heated and melted and then solidified by cooling, and oil gradually exudates has been developed. . The inner race 2 and the outer race 3 of the bearing 1 are coated with a small amount of a lubricant such as grease on the raceways 2b and 3b.

According to this configuration, the lubricant 11 or its components filled in the lubricant reservoir space 6 is not liable to cause the capillary phenomenon and the phenomenon from the lubricant outflow passage 10 formed at the fitting surface of the pin 9 and the through hole 7. Centrifugal force caused by the rotation of the inner ring 2 flows out to the polishing steal 8, and lubricates the raceway surface 2b and the sliding contact surface 2c between the rolling element 5 and the collar 2a. When the lubricant 11 is a semi-solid grease, the grease base oil is mainly separated from the thickener and flows out.

As described above, not only the lubricant applied to the raceways 2b and 3b in advance, but also the lubricant 11 or its components filled in the lubricant reservoir space 6 is gradually supplied to the raceways 2b during operation. Therefore, the lubrication life of the bearing 1 is improved. Therefore, it is possible to reduce the amount of grease previously applied to the raceway surfaces 2b and 3b, and to reduce heat generation due to stirring resistance. Further, since the lubricant outflow passage 10 is formed with a minute gap due to the surface roughness of the fitting surface, unlike the case where the through hole itself is simply used as the lubricant outflow passage, the flow rate is restricted within the processing limit. The effect is not limited, and a small amount can be supplied with easy processing.

The amount of outflow from the lubricant outflow passage 10 can be adjusted by the surface roughness of the fitting surface of the pin 9 and the through hole 7 or the fitting interference. Further, as shown in FIGS. 3 (A) and 3 (B), it is possible to increase the flow rate by providing minute axial grooves 9c and spiral grooves 9d on the surface of the pin 9.

FIG. 4 shows an embodiment corresponding to claim 2. This embodiment is an example applied to a single-row angular contact ball bearing 21. In this example, the inner ring 22 has a narrow width where the non-load side portion is omitted, and the lubricant reservoir space 24 formed of a circumferential groove is provided in the inner ring spacer 23 arranged in the omitted portion. In the lubricant reservoir space 24, a through hole 26 is provided near the raceway surface 22a of the inner ring 22, and a pin 27 is fitted therein. In the figure, 25 is a rolling element, 28 is an outer ring, 29 is a housing, and 30 is a shaft. Also in the case of such a configuration, the effect of improving the lubrication life by the minute supply of the lubricant can be obtained as in the case of the above-described embodiment.

In each of the above-described embodiments, the lubricant reservoir spaces 6 and 24 are formed by the circumferential groove, but the lubricant reservoir spaces 6 and 24 are locally provided at a plurality of locations in the circumferential direction. It's good.

[0015]

[Effect of device]

 The rolling bearing lubrication device of the present invention has a through hole penetrating from the lubricant reservoir space provided in the inner ring or the inner ring spacer to the vicinity of the raceway surface of the inner ring, and the fitting surface of the pin fitted in this through hole is formed. Since the lubricant outflow passage with a minute gap is formed, the lubricant can be stably supplied in a minute amount, the lubrication life can be improved and heat generation can be prevented, and the processing is simple.

[Brief description of drawings]

FIG. 1A is a sectional view of an embodiment of the present invention, and FIG.
FIG. 4 is a partially enlarged cross-sectional view thereof.

2A and 2B are side views of modified examples of the pins.

3A and 3B are side views of other modified examples of the pins.

FIG. 4 is a sectional view of another embodiment of the present invention.

[Explanation of symbols]

2 ... inner ring, 2b ... raceway surface, 3 ... outer ring, 5 ... rolling element, 6 ...
Lubricant storage space, 7 ... Through hole, 9 ... Pin, 10 ... Lubricant outflow passage, 11 ... Lubricant, 23 ... Inner ring spacer, 26 ... Through hole, 27 ... Pin

Claims (2)

[Scope of utility model registration request] 1. A lubricant reservoir space is provided in an inner ring, a through hole is provided from this space near the raceway surface of the inner ring, and a minute gap is formed in a fitting surface between a pin fitted in the through hole and the through hole. Rolling bearing lubrication device with a lubricant outflow passage. 2. A lubricant reservoir space is provided in the inner ring spacer, a through hole is provided from this space to the vicinity of the raceway surface of the inner ring, and a minute hole is formed on the fitting surface between the pin fitted into the through hole and the through hole. Rolling bearing lubrication device with a lubricant outflow passage in a gap.