JP2003013966A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing capable of supplying a sufficient amount of lubricating oil between a roller and a rolled surface of the roller. SOLUTION: Minimum dimensions dA and dB of respective gaps 15 and 16 formed among a pillar portion 14a of a retainer, a shaft 11, and an outer ring 12 are set at 0.1 mm or more so as to secure a passage of lubricating oil among the pillar portion 14a, shaft 11, and outer ring 12.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a transmission for an automobile,
The present invention relates to a roller bearing used for general industrial equipment, electrical equipment, etc.

[0002]

2. Description of the Related Art A / T (automatic transmission),
In an automotive transmission such as M / T (manual transmission), a radial roller bearing as shown in FIG. 4 or 5 is used as a bearing for supporting an input shaft connected to an output shaft of an engine, for example. . This radial roller bearing comprises an outer ring 12 provided on the outer periphery of a shaft 11 to be supported, and a plurality of rollers 1 arranged between the outer ring 12 and the shaft 11.
3 and a cylindrical cage 14 for holding these rollers 13 at substantially equal intervals along the circumferential direction of the outer ring 12, and a lubricating oil is provided between the shaft 11 and 13 and the outer ring 12 and 13. Is formed of an oil film (not shown).

In such a radial roller bearing, the shaft 11
Since the oil film formed between the place 13 and the outer ring 12 and the place 13 causes the oil film to run out, seizure easily occurs.
Lubricating oil is supplied from the gaps formed between the shaft 11 and the cage 14 and between the outer ring 12 and the cage 14 to prevent the oil film from running out.

[0004]

However, in the conventional radial roller bearing shown in FIGS. 4 and 5, the minimum size of the annular clearance formed on the inner diameter side of the cage 14 is, for example, 0.05 mm. The lubricating oil was throttled at this portion, and it was difficult to supply a sufficient amount of lubricating oil between the shaft 11 and the shaft 13. In particular, the above problem becomes remarkable when an oil with a small amount of lubricating oil and poor lubricity is used, such as a roller bearing used in a compressor for a car air conditioner. Moreover, the same problem may occur in the thrust roller bearing.

The present invention has been made in view of these problems, and provides a roller bearing capable of supplying a sufficient amount of lubricating oil between a roller and a rolling surface on which the roller rolls. The purpose is to provide.

[0006]

In order to achieve the above object, the invention according to claim 1 is an outer ring provided on the outer periphery of a shaft to be supported, and is arranged between the outer ring and the shaft. A roller bearing having a plurality of rollers and a cage having a pillar between pockets for holding the rollers, the roller bearing being formed between the shaft and the pillar and / or the outer ring and the pillar. The minimum dimension of the formed gap is 0.1 mm or more.

As described above, the minimum size of the gap formed between the shaft and the pillar portion and / or the outer ring and the pillar portion is 0.1 mm.
With the above, a lubricating oil flow path is secured between the shaft and the pillar portion and / or the outer ring and the pillar portion, so that a sufficient amount of lubricating oil is supplied between the shaft portion and / or the outer ring portion. be able to. The invention according to claim 2 is a ring-shaped cage having a pair of thrust traces facing each other, a plurality of rollers arranged between these thrust traces, and a column portion between boquettes holding these rollers. In the roller bearing including, the minimum dimension of the gap formed between the thrust trace and the column portion is 0.1 mm or more.

As described above, when the minimum size of the gap formed between the thrust trace and the pillar portion is set to 0.1 mm or more, the flow path of the lubricating oil is secured between the pillar portion and the thrust trace. Therefore, it is possible to supply a sufficient amount of lubricating oil between the thrust race and the place.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. A cross-sectional view of the radial roller bearing according to the first embodiment of the present invention is shown in FIG. As shown in the figure, the radial roller bearing according to the present embodiment has an outer ring 12 provided on the outer periphery of a shaft 11 to be supported and an outer ring 1
2, a plurality of rollers 13 arranged between the shaft 2 and the shaft 11, and a cylindrical cage 14 for holding the rollers 13 at substantially equal intervals along the circumferential direction of the outer ring 12. There is.

The cage 14 has a pillar portion 14a between pockets for holding the rollers 13, and the pillar portion 14a and the shaft 11 are provided.
The gaps 15 and 16 formed between the outer ring 12 and the outer ring 12 have minimum dimensions d _A and d _B of 0.1 mm or more. The minimum dimensions d _A and d _B of the gaps 15 and 16 formed between the column portion 14a and the shaft 11 and the outer ring 12 are 0 mm, 0.
02mm, 0.05mm, 0.07mm, 0.10m
Table 1 shows the results of evaluation of seizure property of each radial roller bearing when m, 0.15 mm and 0.20 mm.

[0011]

[Table 1]

Here, the test bearing has an inner diameter of 15 m.
m, outer diameter 22 mm, width 15 mm, using a radial needle roller bearing, rotate the test bearing under the conditions of oil supply: 0.1 cc / min, radial load: 500 N, rotation speed: 5000 min ^-1 to make a test bearing. The time until the image sticking occurred was measured and evaluated. As is clear from Table 1, the gap 1 formed between the column portion 14a and the shaft 11 and the outer ring 12
When the minimum dimensions d _A and d _{B of} 5, 16 were 0.07 mm, seizure occurred on the test bearing within 10 to 15 minutes after rotating the test bearing, but the column portion 14a, the shaft 11 and the outer ring 12 When the minimum dimensions d _A and d _{B of the} gaps 15 and 16 formed between and are 0.1 mm or more, the test bearing is rotated and then 6
It can be seen that seizure does not occur on the test bearing even after 0 minutes.

Therefore, when the minimum dimensions d _A and d _B of the gaps 15 and 16 formed between the column portion 14a and the shaft 11 and the outer ring 12 are set to 0.1 mm or more, the column portion 14a and the shaft 1 are formed.
Since a flow path for lubricating oil is secured between the shaft 1 and the outer ring 12, a sufficient amount of lubricating oil can be supplied between the shaft 11 and the outer ring 12 and the outer ring 12 and the outer ring 12 to prevent the radial roller bearing from burning The stickiness can be improved.

Although the welding type cage is used in the above-described first embodiment, the present invention is not limited to this. For example, a punching cage by a press, a scraping cage, or the like may be used. The effect of is obtained. Further, in the first embodiment described above, the present invention is applied to the shell type radial roller bearing in which the outer ring 12 is formed by pressing,
For example, the present invention can be applied to a solid type radial roller bearing in which the outer ring 12 is formed by scraping.

Further, in the above-described first embodiment, the pillar portion 1
4a and the gap 1 formed between the shaft 11 and the outer ring 12
5,16 minimum dimension d _A of, although the d _B than 0.1 mm, the same effect is obtained even if the minimum dimension of one of the gaps among the gaps 15 and 16 above 0.1 mm. Further, although the case where the present invention is applied to the radial roller bearing of the type having no inner ring has been described in the above-described first embodiment, it is needless to say that the present invention can also be applied to the radial roller bearing of the type having an inner ring. .

Next, FIG. 2 shows a partial sectional view of a thrust roller bearing according to a second embodiment of the present invention. As shown in the figure, a thrust roller bearing according to a second embodiment of the present invention includes a pair of thrust traces 21 facing each other and a plurality of rollers 2 arranged between these thrust traces 21.
2 and an annular cage 23 that holds these rollers 22 at substantially equal intervals along the circumferential direction of the thrust trace 21.

The cage 23 has a pillar portion 23a between pockets for holding the rollers 22, and the gaps 24 and 25 formed between the pillar portion 23a and the thrust trace 21 have a minimum dimension d _C. , D _D is 0.1 mm or more. The minimum dimensions d _C and d _D of the gaps 24 and 25 formed between the column portion 23a and the thrust trace 21 are 0 mm, 0.
02mm, 0.05mm, 0.07mm, 0.10m
Table 2 shows the results of evaluation of seizure property of each thrust roller bearing when m, 0.15 mm and 0.20 mm.

[0018]

[Table 2]

Here, the test bearing has an inner diameter of 30 m.
m, outer diameter 50 mm, height 5 mm, using a thrust needle roller bearing, the test bearing was rotated under the conditions of supply oil amount: 0.1 cc / min, radial load: 2000 N, rotation speed: 5000 min ^−1. It was evaluated by measuring the time until seizure occurred on the. As is clear from Table 2, when the minimum dimensions d _C and d _{D of the} gaps 24 and 25 formed between the column portion 23a and the thrust trace 21 are 0.07 mm, after rotating the test bearing, 13 Although seizure occurred on the test bearing in about 15 minutes, the pillar portion 23a and the thrust trace 21
The minimum dimensions d _C , d _{D of the} gaps 24, 25 formed between
When 0.1 mm or more, it is found that seizure does not occur in the test bearing even after 60 minutes have passed since the test bearing was rotated.

Therefore, when the minimum dimension of the gaps 24, 25 formed between the thrust trace 21 and the column portion 23a of the cage 23 is set to 0.1 mm or more, the column portion 23a of the cage 23 and the thrust trace 21 are separated from each other. Since the flow path of the lubricating oil is secured between the two, it is possible to supply a sufficient amount of the lubricating oil between the thrust traces 21 and 22. In the second embodiment described above, the thrust trace 21 and the cage 2 are
Both the gaps 24 and 2 formed between the three pillars 23a
Although the minimum size of 5 is set to 0.1 mm or more, the same effect can be obtained even if the minimum size of one of the gaps is set to 0.1 mm or more. Further, the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be applied to a thrust roller bearing having a cage shape as shown in FIG.

[0021]

As described above, according to the roller bearing of the first aspect of the invention, the flow path of the lubricating oil is secured between the column portion of the cage and the shaft, so that A sufficient amount of lubricating oil can be supplied between them, and seizure resistance can be improved. According to the roller bearing of the second aspect of the present invention, since the flow path of the lubricating oil is secured between the pillar portion of the cage and the thrust trace, a sufficient amount of lubricating oil is provided between the thrust bearing and the thrust trace. It can be supplied, and seizure resistance can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a radial roller bearing according to a first embodiment of the present invention.

FIG. 2 is a partial sectional view of a thrust roller bearing according to a second embodiment of the present invention.

FIG. 3 is a partial sectional view of a thrust roller bearing according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional radial roller bearing.

FIG. 5 is a partial cross-sectional view of a conventional thrust roller bearing.

[Explanation of symbols]

11 axes 12 outer ring Around 13 14 cage 14a Pillar 15, 16 gap 21 Thrust Race Around 22 23 Cage 23a Pillar 24,25 gap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiro Nomura             1-6-3 Osaki, Shinagawa-ku, Tokyo Nihonsei             Within Kou Co., Ltd. F term (reference) 3J101 AA13 AA32 AA42 AA52 AA62                       AA72 BA34 BA35 BA37 BA44                       BA45 CA01 DA09 DA11 DA16                       EA01 FA32 GA01 GA11 GA24

Claims (2)

[Claims] 1. An outer ring provided on the outer circumference of a shaft to be supported, a plurality of rollers arranged between the outer ring and the shaft, and a column portion between pockets for holding these rollers. A roller bearing including a cage, wherein the minimum dimension of a gap formed between the shaft and the column portion and / or the outer ring and the column portion is 0.1 mm or more. . 2. A pair of thrust traces facing each other, and a plurality of rollers arranged between these thrust traces,
In a roller bearing provided with an annular cage having a column portion between boquettes for holding these rollers, a minimum size of a gap formed between the thrust trace and the column portion is 0.1 mm or more. A roller bearing characterized in that