JP2003214440A - Roller bearing and chain with roller bearing built therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing capable of improving a rolling wear life and assembly workability by reducing leakage of a lubricant and intrusion of powder dust and by reducing rolling resistance due to produced powder of abrasion and intruded powder dust, and to provide a chain with the roller bearing built therein. <P>SOLUTION: A plurality of rollers 14 are disposed between a roller 15 and a bush 13; nearly ring-like retainers 18 made of a swelling material are respectively disposed at both ends of the roller 15; each retainer 18 has a first cylindrical part 18b and a second cylindrical part 18c; the cylindrical part 18b and the cylindrical part 18c are fitted between the roller 15 and the bush 13; grease is filled between the roller 15 and the bush 13; and thus this roller bearing is structured. This chain 11 is composed by incorporating the roller bearing between a pair of inner plates 12, 12. A plurality of pockets 18d are formed in the cylindrical part 18c, and annular spaces 31 and 32 are respectively formed between the cylindrical part 18c, and the roller 15 and the bush 13. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retainer having a substantially ring shape in which a plurality of rollers are arranged between an outer ring and an inner ring, and a plurality of pockets for guiding the rollers are formed in a cylindrical portion. A roller bearing and a roller which are arranged at both ends, respectively, in which the cylindrical portion of the cage is fitted between the outer ring and the inner ring, and a lubricant is filled between the outer ring and the inner ring. The present invention relates to a chain incorporating a bearing.

[0002]

2. Description of the Related Art The applicant of the present invention has arranged a plurality of rollers between an outer ring and an inner ring, and has a substantially ring-shaped cage in which a plurality of pockets for guiding the rollers are formed in a cylindrical portion. A roller bearing and a roller bearing, wherein the cylindrical portion of the cage is fitted between the outer ring and the inner ring, and a lubricant is filled between the outer ring and the inner ring. Japanese Patent Application No. 2001
It has been filed as No. 342283.

FIG. 7 is a sectional view showing an example of a chain incorporating the roller bearing according to this prior application. FIG. 8 shows a cage that constitutes the roller bearing of FIG. 7, where (A) is (B).
FIG. 6B is a sectional view taken along line ZZ in FIG.

A chain 1 incorporating the roller bearing shown in FIG. 7 has a plurality of rollers 4 arranged on the outer peripheral surface of a bush 3 whose both ends are connected to a pair of inner plates 2 and 2 and surrounds the plurality of rollers 4. And the roller 5 is installed. The roller 5 has a cylindrical shape whose inner and outer peripheral surfaces are straight. Further, a pair of outer plates 6, 6 are arranged outside the inner plate 2,
A pair of outer plates 6, 6 are connected by a pin 7 penetrating the bush 3. Grease is filled as a lubricant between the roller 5 and the bush 3.

The chain 1 is, as shown in FIG.
Substantially ring-shaped resin cages 8 are arranged at both ends of the roller 5, respectively. As shown in FIGS. 8 (A) and 8 (B), the retainer 8 is composed of a collar portion 8a and a cylindrical portion 8b. The collar portion 8a is in contact with the end surface of the roller 5, and the cylindrical portion 8b is fitted between the roller 5 and the bush 3. The cylindrical portion 8b has a pocket 8d of a predetermined depth in the axial direction.
Are formed in plural. As shown in FIG. 7, the pockets 8d hold and guide the ends of the rollers 4.

The roller 5 functions as the outer ring of the roller bearing, the plurality of rollers 4 function as the rolling elements of the roller bearing, and the bush 3 functions as the inner ring of the roller bearing. Therefore, the roller 5, the plurality of rollers 4, the bush 3, and the cage 8 form a roller bearing. In this chain 1, a roller bearing including a roller 5, a plurality of rollers 4, a bush 3 and a cage 8 is incorporated between a pair of inner plates 2 and 2.

[0007]

The chain 1 incorporating the roller bearing shown in FIG. 7 has the following problems.

The grease filled between the roller 5 (outer ring) and the bush 3 (inner ring) is a centrifugal force generated by the rotation of the roller (outer ring) 5, and the inner peripheral surface of the roller (outer ring) 5 and the cylinder of the cage 8. Grease gradually leaks from the gap between the outer peripheral surface of the portion 8b,
Rolling wear life is significantly reduced. In addition, the fact that grease easily leaks easily causes dust and the like to enter from the outside, resulting in a reduction in rolling wear life. In particular, the larger this gap, the stronger the tendency. FIG. 9 is a graph showing the relationship between the rolling wear life and the gap between the inner peripheral surface of the roller (outer ring) 5 and the outer peripheral surface of the cylindrical portion 8b of the cage 8. As shown in FIG. 9, when the gap is 0.9 mm, the rolling wear life is half or less compared to when the gap is about 0.2 mm.

Further, the grease leaked from the gap between the inner peripheral surface of the roller (outer ring) 5 and the outer peripheral surface of the cylindrical portion 8b of the cage 8 adheres to the roller (outer ring) 5 and other devices,
Usage environment deteriorates. In particular, in the food manufacturing field and the like, when water is splashed, grease leaks out, and there is a problem of contaminating food.

On the contrary, if the gap between the inner peripheral surface of the roller (outer ring) 5 and the outer peripheral surface of the cylindrical portion 8b of the retainer 8 is reduced, the retainability of the retainer 8 is deteriorated and the manufacturing precision is required. Therefore, the cost is increased.

When the gap between the inner peripheral surface of the roller (outer ring) 5 and the outer peripheral surface of the cylindrical portion 8b of the retainer 8 is small, dust or abrasion powder that has entered from the outside causes centrifugal rotation of the roller (outer ring) 5. The force easily collects on the inner peripheral side of the roller (outer ring) 5. Since there is no space in the chain 1 for letting out such dust and wear powder, the pocket 8 of the cage 8
The grease is scraped off by d and easily penetrates between the roller (rolling element) 4 and the roller (outer ring) 5 or between the roller (rolling element) 4 and the bush (inner ring) 3, resulting in rolling resistance and stability. I can not get the rotation I did. Further, since the cylindrical portion 8b of the cage 8 is easily deformed at the time of molding, it does not enter the inner peripheral surface of the roller (outer ring) 5 due to the deformation, or even if it enters, it strongly contacts the inner peripheral surface of the roller (outer ring) 5. Then, it slides and wears, and in the worst case, the roller 4 cannot be accurately guided.

Therefore, the present invention solves the above problems, reduces the leakage of lubricant and the intrusion of dust, reduces the rolling resistance due to the generated abrasion powder and the invaded dust, and the rolling wear life and assembly. It is an object of the present invention to provide a roller bearing and a chain incorporating the roller bearing, which can improve the property.

[0013]

In order to achieve the above object, a roller bearing of the invention according to claim 1 has a plurality of rollers arranged between an outer ring and an inner ring, and a plurality of pockets for guiding the rollers. Substantially ring-shaped retainers formed in a cylindrical portion are arranged at both ends of the outer ring, and the cylindrical portion of the retainer is fitted between the outer ring and the inner ring, and the outer ring and the inner ring are In the roller bearing configured by enclosing a lubricant between the first cylindrical part and the second cylindrical part, the second cylindrical part or the second cylindrical part and the first cylindrical part. The plurality of pockets are formed in a part of the portion, and the second pocket is formed.
The above problem is solved by forming an annular space between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the outer ring.

In the roller bearing of the invention according to claim 2, in addition to the structure according to claim 1, an annular space is formed between the inner peripheral surface of the second cylindrical portion and the outer peripheral surface of the inner ring. By doing so, the above problems can be further solved.

In the roller bearing of the invention according to claim 3, in addition to the structure according to claim 1 or claim 2, the cage is formed of a swellable material that swells with a liquid, and thus the problem is solved. To solve even more.

In a chain incorporating the roller bearing of the invention according to claim 4, a plurality of rollers are arranged between a roller functioning as an outer ring and a bush functioning as an inner ring, and a plurality of pockets for guiding the rollers are cylindrical. A substantially ring-shaped retainer formed on each end of the roller, the cylindrical portion of the retainer is fitted between the roller and the bush, and the roller and the bush are connected to each other. In a chain in which a lubricant is sealed between the roller bearings and the roller bearings are assembled between a pair of inner plates, the cylindrical portion includes a first cylindrical portion and a second cylindrical portion. Portion or the second cylindrical portion and a part of the first cylindrical portion, the plurality of pockets are formed, and an annular space is formed between the outer peripheral surface of the second cylindrical portion and the inner peripheral surface of the roller. By doing the above, It is intended to attain.

According to a fifth aspect of the present invention, in addition to the structure of the fourth aspect, a chain incorporating the roller bearing has an annular shape between the inner peripheral surface of the second cylindrical portion and the outer peripheral surface of the bush. By forming the space of, the above-mentioned problems are further solved.

In a chain incorporating the roller bearing of the invention according to claim 6, a plurality of rollers are arranged between a roller functioning as an outer ring and a pin functioning as an inner ring, and a plurality of pockets for guiding the rollers have a cylindrical portion. A substantially ring-shaped retainer formed on each of the rollers is arranged at both ends of the roller, and the cylindrical portion of the retainer is fitted between the roller and the pin, and lubricated between the roller and the pin. In a chain in which an agent is enclosed to form a roller bearing, and the roller bearing is incorporated between a pair of inner plates, the cylindrical portion includes a first cylindrical portion and a second cylindrical portion, and the second cylindrical portion or the second cylindrical portion The plurality of pockets are formed in a part of the second cylindrical portion and the first cylindrical portion, and an annular space is formed between the outer peripheral surface of the second cylindrical portion and the inner peripheral surface of the roller. ,
The above problems are solved.

According to a seventh aspect of the present invention, in addition to the structure of the sixth aspect, the chain incorporating the roller bearing has an annular shape between the inner peripheral surface of the second cylindrical portion and the outer peripheral surface of the pin. By forming the space of, the above-mentioned problems are further solved.

In the chain incorporating the roller bearing of the invention according to claim 8, in addition to the structure according to any one of claims 4 to 7, the cage is formed of a swelling material that swells with a liquid. By doing so, the above problems can be further solved.

[0021]

Since the roller bearing and the chain incorporating the roller bearing of the present invention have the above-mentioned structure, they have the following unique effects of the present invention.

Since the cage is made of a swelling material that swells with a liquid, it is possible to form the cage in advance to have a size smaller than a predetermined size, that is, before assembly.
A sufficient clearance can be secured between the inner peripheral surface of the roller (outer ring) and the outer peripheral surface of the first cylindrical portion, and the clearance between the outer peripheral surface of the bush (inner ring) and the inner peripheral surface of the first cylindrical portion, which improves the assemblability. . After the cage is assembled, the cage absorbs liquid and swells, the outer diameter of the first cylindrical portion increases, the inner diameter decreases, and the inner peripheral surface of the roller (outer ring) and the first cylindrical portion age-wise. The gap between the outer peripheral surfaces of and the outer peripheral surface of the bush (inner ring) and the inner peripheral surface of the first cylindrical portion decrease. Therefore, the leakage of the lubricant from these gaps can be reduced, and the intrusion of dust from the outside can be suppressed. Furthermore, the cage is a roller (outer ring) or bush (inner ring).
The self-lubricating property is improved even when sliding with and it rotates more smoothly. Moreover, even if the cage swells and the first cylindrical portion comes into contact with the roller (outer ring) or bush (inner ring) and slides, the force of expansion of the cage is very small and the sliding resistance force is very small. Since it is very small, it does not hinder the rotation of the roller (outer ring). In this case, the leakage of lubricant and the intrusion of dust can be further suppressed.

Further, an annular space is formed between the inner peripheral surface of the roller (outer ring) and the outer peripheral surface of the second cylindrical portion of the cage, and the outer peripheral surface of the bush (inner ring) or pin (inner ring) and the cage. Second
Since an annular space is formed between the inner peripheral surfaces of the cylindrical part, abrasion powder and lubricant that have moved to the inner peripheral surface of the roller (outer ring) by centrifugal force will not be scraped off by the cage pocket. , Accumulates in the annular space and is less likely to enter the rolling surface of the roller. Furthermore, dust that has entered from the outside also accumulates in the annular space, making it difficult for the dust to enter the rolling surfaces of the rollers. Thereby, smooth rotation of the roller (outer ring) and leakage of the lubricant can be suppressed. Further, since an annular space is formed between the outer peripheral surface of the bush (inner ring) or the pin (inner ring) and the inner peripheral surface of the second cylindrical portion of the cage, the lubricant is stored in this annular space, It is possible to further suppress the leakage of the lubricant.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A chain incorporating a roller bearing according to a first embodiment of the present invention will be described with reference to FIGS. 1 is a sectional view of a chain incorporating a roller bearing according to a first embodiment of the present invention. FIG. 2 shows a cage constituting the roller bearing of FIG. 1, (A) is a sectional view taken along line XX in (B), and (B) is a front view.

In the chain 11 incorporating the roller bearing shown in FIG. 1, a plurality of rollers 14 are arranged on the outer peripheral surface of a bush 13 whose both ends are connected to a pair of inner plates 12, 12.
A roller 15 is mounted so as to surround the plurality of rollers 14.
The roller 15 has a cylindrical shape whose inner and outer peripheral surfaces are straight. Further, a pair of outer plates 16, 16 are arranged outside the inner plate 12, and the pair of outer plates 16, 16 are connected by a pin 17 penetrating the bush 13. Grease is filled as a lubricant between the roller 15 and the bush 13.

Further, in the chain 11, as shown in FIG. 1, substantially ring-shaped holders 18 are arranged at both ends of the roller 15, respectively. As shown in FIGS. 2A and 2B, the retainer 18 includes a collar portion 18a and a first cylindrical portion 18b.
And the second cylindrical portion 18c. First cylindrical part 1
A step is formed between 8b and the second cylindrical portion 18c.
That is, the outer diameter of the second cylindrical portion 18c is equal to the first cylindrical portion 18b.
And the inner diameter of the second cylindrical portion 18c is larger than the inner diameter of the first cylindrical portion 18b. The collar portion 18a contacts the end surface of the roller 15, and the first cylindrical portion 18b and the second cylindrical portion 18c are fitted between the roller 15 and the bush 13. A plurality of pockets 18d having a predetermined depth are formed in the second cylindrical portion 18c in the axial direction. Then, as shown in FIG. 1, each pocket 18d holds and guides the end of each roller 14.

Further, cages 18 are arranged at both ends of the roller 15, and the first cylindrical portion 18b and the second cylindrical portion 18 are provided.
When c is fitted between the roller 15 and the bush 13, an annular space 31 is formed between the inner peripheral surface of the roller 15 and the outer peripheral surface of the second cylindrical portion 18c, and the outer peripheral surface of the bush 13 and An annular space 32 is formed between the inner peripheral surfaces of the two cylindrical portions 18c.

The holder 18 is made of a swelling material that swells with liquid. Specifically, the retainer 18
Is formed of a polyamide resin (for example, nylon 66 or the like). The cage 18 absorbs the oil component of the grease enclosed as a lubricant and swells. The cage 18 is made of polyamide resin (for example, nylon 6).
It is also possible to use a resin such as 6 as a base material resin and a polyamide resin (for example, nylon 66) to which an oil absorbing agent is added. In this case, the effect of absorbing the oil content of the grease and swelling can be further expected. As the base material resin, acrylonitrile-butadiene-styrene resin, polyvinyl chloride, polyacetal, etc. can be used in addition to the polyamide resin (eg, nylon 66). As the oil absorbing agent, a crosslinked copolymer such as polynorbornene, alkylstyrene, alkyl (meth) acrylate, hydroxyalkyl (meth) acrylate is used.

Further, the retainer 18 can be made by adding a water absorbing agent to the base material resin. As the water absorbing agent, a synthetic polymer type, that is, a polyacrylic acid type, a polyvinyl alcohol type, a polyoxyethylene type, or a polyacrylamide type can be used, and in addition, a starch type or a cellulose type water absorbing agent can be used. In addition, the retainer 18
Can be used by adding an oil absorbing agent and a water absorbing agent to the base material resin.

The above oil absorbing agent or water absorbing agent is used by being contained in an amount of 0.01 to 50 wt% with respect to the base material resin.
If it is less than 0.01 wt%, swelling property cannot be obtained and
If it exceeds wt%, it exceeds the limit of shaping as a molded product.
The oil absorbing agent or water absorbing agent is 1
It is preferably contained in an amount of ˜5 wt%. This is because in this range, a remarkable swelling property as a cage can be obtained.

Further, the cage 18 is formed smaller than a predetermined size in advance, that is, before assembly, in consideration of swelling due to the oil component of the grease enclosed as a lubricant.

The roller 15 functions as the outer ring of the roller bearing, the plurality of rollers 14 function as the rolling elements of the roller bearing, and the bush 13 functions as the inner ring of the roller bearing. Therefore, the roller 15, the plurality of rollers 14, the bush 13, and the cage 18 form a roller bearing. In this chain 11, a roller bearing composed of a roller 15, a plurality of rollers 14, a bush 13 and a cage 18 is incorporated between a pair of inner plates 12, 12.

Next, the operation of the chain 11 will be described. Since the cage 18 is formed in advance smaller than a predetermined size, that is, before assembly, the roller (outer ring) 15
It is possible to sufficiently secure the gap between the inner peripheral surface of the first cylindrical portion 18b and the outer peripheral surface of the first cylindrical portion 18b and the outer peripheral surface of the bush (inner ring) 13 and the inner peripheral surface of the first cylindrical portion 18b, and the assemblability is significantly improved. To do. After the retainer 18 is assembled, the retainer 18 absorbs the oil component of the grease and swells, and the outer diameter of the first cylindrical portion 18b increases,
The inner diameter becomes smaller, and the gap between the inner peripheral surface of the roller (outer ring) 15 and the outer peripheral surface of the first cylindrical portion 18b and the outer peripheral surface of the bush (inner ring) 13 and the inner peripheral surface of the first cylindrical portion 18b age-wise. The gap is reduced. Polyamide resin, such as nylon 66, expands about 0.5% in about 100 days. For this reason,
Since the retainer 18 absorbs the grease oil at the time of actual use after manufacturing, the gap between the inner peripheral surface of the roller (outer ring) 15 and the outer peripheral surface of the first cylindrical portion 18b and the bush (inner ring). The gap between the outer peripheral surface of 13 and the inner peripheral surface of the first cylindrical portion 18b is small. Therefore, the leakage of grease from these gaps is reduced, and the intrusion of dust from the outside can be suppressed. Further, the cage 18 is a roller (outer ring) 1
5 and the bush (inner ring) 13 also slide, the self-lubricating property is improved, and the motor rotates more smoothly. Further, even if the cage 18 swells and the first cylindrical portion 18b comes into contact with the roller (outer ring) 15 and the bush (inner ring) 13 and slides, the force of expansion of the cage 18 is extremely small, and Since the dynamic resistance is very small, there is no great obstacle to the rotation of the roller (outer ring) 15. In this case, grease leakage and dust infiltration can be further suppressed.

An annular space 3 is provided between the inner peripheral surface of the roller (outer ring) 15 and the outer peripheral surface of the second cylindrical portion 18c of the retainer 18.
1, the outer peripheral surface of the bush (inner ring) 13 and the cage 1 are formed.
Since the annular space 32 is formed between the inner peripheral surfaces of the second cylindrical portion 18c of No. 8, the abrasion powder and the grease moved to the inner peripheral surface of the roller (outer ring) 15 by the centrifugal force are retained in the pockets of the cage 18. It is not scraped off by 18 d, is deposited in the annular space 31 and is less likely to enter the rolling surface of the roller 14. Furthermore, dust that has entered from the outside is also used as the annular space 31.
It is accumulated inside and is less likely to enter the rolling surface of the roller 14. As a result, smooth rotation of the roller (outer ring) 15 and leakage of grease can be suppressed. Also, bush (inner ring)
Since the annular space 32 is formed between the outer peripheral surface of 13 and the inner peripheral surface of the second cylindrical portion 18c of the retainer 18, grease is stored in the annular space 32 and further grease leakage is suppressed. be able to.

The chain 11 has the following effects. Between the second cylindrical portion 18c of the retainer 18 and the roller (outer ring) 15, and the second cylindrical portion 18c of the retainer 18.
Since the annular spaces 31 and 32 are formed between the bush and the bush (inner ring) 13, the grease leakage is reduced, the grease can be retained for a long time, and the generated abrasion powder enters the rolling surface of the roller 14 again. Since this is difficult, the rolling wear life is improved and the rotation of the roller (outer ring) 15 is stabilized. Further, at the time of assembling the retainer 18, a gap between the first cylindrical portion 18b of the retainer 18 and the roller (outer ring) 15, and the first cylindrical portion 18b of the retainer 18.
Since a gap between the bush and the inner ring 13 is secured,
Assemblability is improved. Further, the swelling of the cage 18 reduces the gap between the first cylindrical portion 18b of the cage 18 and the roller (outer ring) 15 and the gap between the first cylindrical portion 18b of the cage 18 and the bush (inner ring) 13. , Improved dust resistance,
Grease is less likely to leak, and greasing is unnecessary, making maintenance free.

Next, a modified example of the cage 18 shown in FIG. 2 will be described. 3 shows a modified example of the cage 18 shown in FIG. 2, (A) is a sectional view taken along line XX in (B), and (B) is a front view.

The cage 18 'shown in FIG. 3 is different from the cage 18 shown in FIG. 2 only in the form of formation of the plurality of pockets 18'd. That is, while a plurality of pockets 18d of the cage 18 shown in FIG. 2 are formed only in the second cylindrical portion 18c at a predetermined depth in the axial direction, pockets 18 'of the cage 18' shown in FIG. 3 are formed. A plurality of d's are formed in a predetermined depth in the axial direction over a part of the second cylindrical portion 18c and the first cylindrical portion 18b, and other configurations are similar to those of the cage 18 shown in FIG. Then, the operation of the cage 18 'shown in FIG.
The effect is almost the same as that of the cage 18 shown in FIG.

Next, a chain incorporating the roller bearing according to the second embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a sectional view of a chain incorporating a roller bearing according to a second embodiment of the present invention. FIG. 5 shows a cage constituting the roller bearing of FIG. 4, (A) is a sectional view taken along line YY in (B), and (B) is a front view.

The chain 21 incorporating the roller bearing shown in FIG. 4 differs from the roller chain 11 shown in FIG. 1 only in that the bush 13 is not used (bushless chain). That is, in the chain 21 shown in FIG. 4, the pair of outer plates 26, 26 are connected to both ends of the pin 27 into which the pair of inner plates 22, 22 are fitted, and the plurality of rollers 24 are provided on the outer peripheral surface of the pin 27. The rollers 25 are arranged so as to surround the plurality of rollers 24. The roller 25 has a cylindrical shape whose inner and outer peripheral surfaces are straight. Grease is filled as a lubricant between the roller 25 and the pin 27.

Further, in the chain 21, as shown in FIG. 4, substantially ring-shaped holders 28 are arranged at both ends of the roller 25, respectively. As shown in FIGS. 5A and 5B, the retainer 28 includes a collar portion 28a and a first cylindrical portion 28b.
And the second cylindrical portion 28c. First cylindrical portion 2
A step is formed between 8b and the second cylindrical portion 28c.
That is, the outer diameter of the second cylindrical portion 28c is the same as the first cylindrical portion 28b.
And the inner diameter of the second cylindrical portion 28c is larger than the inner diameter of the first cylindrical portion 28b. The collar portion 28a contacts the end surface of the roller 25, and the first cylindrical portion 28b and the second cylindrical portion 28c are fitted between the roller 25 and the pin 27. A plurality of pockets 28d having a predetermined depth are formed in the second cylindrical portion 28c in the axial direction. Then, as shown in FIG. 4, each pocket 28d holds and guides the end portion of each roller 24.

Further, cages 28 are arranged at both ends of the roller 25, and the first cylindrical portion 28b and the second cylindrical portion 28 are arranged.
When c is fitted between the roller 25 and the pin 27, an annular space 41 is formed between the inner peripheral surface of the roller 25 and the outer peripheral surface of the second cylindrical portion 28c, and the outer peripheral surface of the pin 27 and the An annular space 42 is formed between the inner peripheral surfaces of the two cylindrical portions 28c.

Further, the retainer 28 is made of a swelling material which is swollen by a liquid, like the retainer 18 in the first embodiment of the present invention. The specific material used for the cage 28 is the same as that of the cage 18 described above, and thus the description thereof is omitted.

The roller 25 functions as the outer ring of the roller bearing, the plurality of rollers 24 function as the rolling elements of the roller bearing, and the pin 27 functions as the inner ring of the roller bearing. Therefore, the roller 25, the plurality of rollers 24, the pin 27, and the retainer 28 form a roller bearing. This chain 21
In FIG. 3, a roller bearing including a roller 25, a plurality of rollers 24, a pin 27, and a cage 28 is incorporated between the pair of inner plates 22, 22.

Since the action and effect of this chain 21 are the same as those of the chain 11 described above, the description thereof will be omitted.

Next, a modified example of the cage 28 shown in FIG. 5 will be described. FIG. 6 shows a modified example of the cage 28 shown in FIG. 5, (A) is a sectional view taken along line XX in (B), and (B) is a front view.

The cage 28 'shown in FIG. 6 is different from the cage 28 shown in FIG. 5 only in the form of formation of the plurality of pockets 28'd. That is, while a plurality of pockets 28d of the cage 28 shown in FIG. 5 are formed in the second cylindrical portion 28c only with a predetermined depth in the axial direction, pockets 28 'of the cage 28' shown in FIG. 6 are formed. A plurality of d's are formed in a predetermined depth in the axial direction over a part of the second cylindrical portion 28c and the first cylindrical portion 28b, and other configurations are similar to those of the cage 28 shown in FIG. Then, the action of the cage 28 'shown in FIG.
The effect is substantially the same as that of the cage 28 shown in FIG.

In the chain according to each of the above-described embodiments of the present invention, the cage swells due to the oil content of the enclosed grease, but the present invention is not limited to this. The cage may be made of a swellable material that swells with a liquid. Further, by forming the cage with a swelling material that swells with a liquid, the cage can be swollen in the same manner even in moisture in the air or in an oil or water atmosphere. Furthermore, a bearing incorporating the cage However, when used in a liquid atmosphere such as alcohol, the cage can be swollen in the same manner.

[0048]

Since the roller bearing of the present invention and the chain incorporating the roller bearing have the above-described device structure, the following effects peculiar to the present invention are exhibited.

According to the invention described in claims 1, 2, 4, 5, 6, and 7, the following effects are obtained. An annular space is formed between the second cylindrical portion of the cage and the roller (outer ring), or between the second cylindrical portion of the cage and the bush (inner ring) or the pin (inner ring). Leakage is reduced, the lubricant can be held for a long time, and the generated abrasion powder is unlikely to enter the rolling surface of the roller again, so the rolling wear life is improved and the rotation of the roller (outer ring) is stabilized.

According to the inventions described in claims 3 and 8, the following effects are exhibited in addition to the effects exhibited by the inventions described in claims 1, 2, 4, 5, 6, and 7. At the time of assembling the cage, a gap between the first cylindrical portion of the cage and the roller (outer ring) and a gap between the first cylindrical portion and the bush (inner ring) or the pin (inner ring) are secured, so that the assemblability is improved. improves. In addition, the swelling of the cage reduces the clearance between the first cylindrical portion of the cage and the roller (outer ring), and the clearance between the first cylindrical portion of the cage and the bush (inner ring) or bush (inner ring). The dust property is improved, the lubricant does not leak easily, greasing or lubrication is not required, and maintenance is free.

[Brief description of drawings]

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

FIG. 2 shows a cage that constitutes the roller bearing of FIG. 1, and (A) is a sectional view taken along line XX in (B),
(B) is a front view.

FIG. 3 shows a modified example of the cage shown in FIG.
(A) is the XX sectional view taken on the line in (B), (B)
Is a front view.

FIG. 4 is a sectional view of a chain incorporating a roller bearing according to a second embodiment of the present invention.

5 shows a cage constituting the roller bearing of FIG. 4, (A) being a sectional view taken along line YY in (B), FIG.
(B) is a front view.

FIG. 6 shows a modified example of the cage shown in FIG.
(A) is a YY line sectional view in (B), (B)
Is a front view.

FIG. 7 is a sectional view showing an example of a chain incorporating a roller bearing according to the prior application.

8 shows a cage constituting the roller bearing of FIG. 7, (A) being a sectional view taken along line ZZ in (B), FIG.
(B) is a front view.

FIG. 9 is a graph showing the relationship between the rolling wear life and the gap between the inner peripheral surface of the roller (outer ring) and the outer peripheral surface of the cylindrical portion of the cage.

[Explanation of symbols]

11,21 ... Chain 12, 22 ... Inner plate 13 ... Bush (inner ring) 14, 24 ... 15, 25 ... Roller (outer ring) 16, 26 ... Outer plate 17-pin 27-pin (inner ring) 18, 18 ', 28, 28' ... Retainer 18a, 28a ... collar part 18b, 28b ... the first cylindrical portion 18c, 28c ... second cylindrical portion 18d, 18'd, 28d, 28'd ... pocket 31, 41 ... annular space 32, 42 ... annular space

Claims (8)

[Claims] 1. A plurality of rollers are arranged between an outer ring and an inner ring, and substantially ring-shaped cages each having a plurality of pockets for guiding the rollers formed in a cylindrical portion are arranged at both ends of the outer ring, respectively. A roller bearing configured such that the cylindrical portion of the cage is fitted between the outer ring and the inner ring, and a lubricant is sealed between the outer ring and the inner ring, wherein the cylindrical portion is the first It is composed of a cylindrical portion and a second cylindrical portion, and the plurality of pockets are formed in a part of the second cylindrical portion or the second cylindrical portion and the first cylindrical portion, and the outer peripheral surface of the second cylindrical portion and the A roller bearing, wherein an annular space is formed between the outer ring and the inner circumferential surface of the outer ring. 2. The roller bearing according to claim 1, wherein an annular space is formed between the inner peripheral surface of the second cylindrical portion and the outer peripheral surface of the inner ring. 3. The roller bearing according to claim 1, wherein the cage is made of a swelling material that swells with a liquid. 4. A substantially ring-shaped cage, wherein a plurality of rollers are arranged between a roller functioning as an outer ring and a bush functioning as an inner ring, and a plurality of pockets for guiding the rollers are formed in a cylindrical portion. The roller bearings are arranged at both ends of the roller, the cylindrical portion of the cage is fitted between the roller and the bush, and a lubricant is filled between the roller and the bush to form a roller bearing. In the chain in which the roller bearing is assembled between a pair of inner plates, the cylindrical portion is composed of a first cylindrical portion and a second cylindrical portion, and the second cylindrical portion or the second cylindrical portion and the first cylindrical portion. A plurality of pockets are formed in a part of the chain, and an annular space is formed between the outer peripheral surface of the second cylindrical portion and the inner peripheral surface of the roller. 5. The chain according to claim 4, wherein an annular space is formed between the inner peripheral surface of the second cylindrical portion and the outer peripheral surface of the bush. 6. A substantially ring-shaped retainer in which a plurality of rollers are arranged between a roller functioning as an outer ring and a pin functioning as an inner ring, and a plurality of pockets for guiding the rollers are formed in a cylindrical portion. Of the cage, the cylindrical portion of the cage is fitted between the roller and the pin, and a lubricant is sealed between the roller and the pin to form a roller bearing. In a chain in which a bearing is assembled between a pair of inner plates, the cylindrical part is composed of a first cylindrical part and a second cylindrical part, and the second cylindrical part or the second cylindrical part and a part of the first cylindrical part. The plurality of pockets are formed in the chain, and an annular space is formed between the outer peripheral surface of the second cylindrical portion and the inner peripheral surface of the roller. 7. The chain according to claim 6, wherein an annular space is formed between the inner peripheral surface of the second cylindrical portion and the outer peripheral surface of the pin. 8. The chain according to claim 4, wherein the retainer is made of a swelling material that swells with a liquid.