JP2001082494A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve holding performance and lubricating performance and the like of a polymer including lubricant in a rolling bearing filled with polymer member including lubricant. SOLUTION: This bearing is provided with a outer ring 2 and inner ring 3, plural rolling elements 4 and a cage 5. In addition, a polymer member 6 including lubricant is filled in a space formed by the outer ring 2, inner ring 3, plural rolling elements 4 and the cage 5. In this case, the polymer including lubricant is filled to the position of the cage 5 along the direction of rotating axis C and then hardened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rolling bearing, and more particularly to a rolling bearing filled with a lubricant-containing polymer member.

[0002]

2. Description of the Related Art Generally, a space between an outer ring, an inner ring and a rolling element of a rolling bearing is provided for the purpose of improving lubrication.
May be filled with lubricating oil or grease. However, since these lubricating oils and greases are liquid or semi-solid substances, it is necessary to prevent them from scattering during rotation of the bearing. Therefore, it has been proposed to use a seal or sealing member. However, since the sealing member is difficult to use for a small special bearing, it is difficult to use the lubricating oil or the grease for the small special bearing. Thus, for example, as disclosed in Japanese Patent Publication No. 63-23239, it has been proposed to fill and solidify a lubricant-containing polymer member in a space between an outer ring, an inner ring and a rolling element of a bearing.

FIGS. 14 and 15 show rolling bearings filled with a lubricant-containing polymer member (hereinafter referred to as “polymer-filled bearings”).
That. ) Shows the conventional type. Here, FIGS. 14A and 15A are longitudinal sectional views of the polymer-filled bearings 70 and 80, and FIGS. 14B and 15B are side views thereof. The polymer-filled bearings 70 and 80 in the figure are so-called self-aligning roller bearings, and the rollers 73 and 83, which are rolling elements, can relatively rotate the outer rings 74 and 84 and the inner rings 75 and 85 in the support space. , And rollers 73,
83 are equally held by holders 76 and 86.
In this specification, the “support space” refers to a space between the outer ring and the inner ring.

[0004] Used lubricant-containing polymer members 71, 8
1 is preferably a lubricating composition in which grease is retained in polyethylene, or a lubricating composition in which lubricating oil or grease is contained in a thermosetting resin or a highly oil-absorbing polymer. FIG.
The difference between the polymer-filled bearing of FIG. 4 and the polymer-filled bearing of FIG. 15 is that, in the case of FIG. 14, the space filled with the lubricant-containing polymer member 71 is the entire support space, whereas FIG.
Is that the filling space extends to the roller end face.

[0005]

By the way, the polymer-filled bearings shown in FIGS.
There is a problem (3).

(1) Lubricant-containing polymer members 71, 81
Is relatively low in rigidity, so under high-speed rotation or under conditions of high centrifugal force, the lubricant-containing polymer member filled in portions without the retainers 76 and 86 (FIGS. 14A and 15A) part of P _e) is deformed by centrifugal force or the like in the middle. Then, in the vicinity of the rolling surfaces of the rollers 73 and 83 and the outer raceway, and in the vicinity of the rolling surfaces of the rollers 73 and 83 and the inner raceway, a wedge-shaped lubricant-containing polymer member formed in the circumferential direction (see FIG. 14 (b) and FIG. 15 (b), P _w
) May be caught between the roller rolling surface and the inner raceway and the outer raceway, and the lubricant-containing polymer members 71 and 81 may be damaged.

(2) When the polymer-filled bearings 70 and 80 are used, the roller surface, the outer raceway surface and the inner raceway surface come into contact with the filled lubricant-containing polymer members 71 and 81 to cause friction. The temperature of the polymer-filled bearings 70, 80 may increase. In particular, as in the polymer-filled bearing 70 of FIG. 14, the bearing-filled polymer member 71 is filled up to the bearing end surface, and the area where the outer ring-side raceway surface and the inner ring-side raceway surface come into contact with the lubricant-containing polymer member 71 is small. Wide,
Large friction may produce, also, extra friction since contact portions of the P _e in the case of polymer-filled bearing of Figure 15 may occur.

(3) In the manufacturing process, when the lubricant-containing polymer members 71 and 81 are filled in the supporting space, the lubricant-containing polymer members 71 and 81 are first placed on a liquid or semi-solid, such as a gel. The entire support space is filled in an unfired state, such as in the form of a paste or a paste. After that, it is fired to increase the rigidity to some extent. However, since the filled lubricant-containing polymer members 71, 81 are present at least up to the roller end faces, the cages 76, 86 are fired during firing.
May not be held directly. Therefore, the retainers 76 and 86 cannot always be kept at proper positions.

Therefore, the object of the present invention is to provide
It is to solve the problem (3).

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an outer ring and an inner ring having the same rotation axis and facing each other, and a plurality of rolling elements rotatably accommodated between the outer ring and the inner ring. A moving body, and a retainer for holding the plurality of rolling bodies,
In the rolling bearing in which a lubricant-containing polymer member is filled in a space formed between the outer ring, the inner ring, the rolling elements, and the retainer, the lubricant-containing polymer member is disposed in a direction of the rotation axis. This is achieved by providing a rolling bearing characterized by being substantially filled and solidified to a position where the cage is present.

In the polymer-filled bearing of the present invention, since the lubricant-containing polymer member is filled only up to the position where the cage exists substantially in the direction of the rotation axis, the lubricant-containing polymer member is entirely filled with the cage. Therefore, deformation due to centrifugal force or the like is unlikely to occur. Therefore, breakage caused by deformation of the lubricant-containing polymer member is unlikely to occur. Further, since the lubricant-containing polymer member is filled only up to the position where the cage exists substantially in the direction of the rotation axis, there is an area in the support space where the lubricant-containing polymer member is not filled. Therefore, the contact area between the roller surface and the raceway surface and the lubricant-containing polymer member is reduced. As a result, the friction can be reduced, and the temperature rise of the bearing due to the friction can be reduced.

The polymer-filled bearing of the present invention is provided by using the following manufacturing method. That is, after the rolling bearing serving as the main body is assembled, the unsintered raw material of the lubricant-containing polymer member is filled in the support space of the rolling bearing, and thereafter, the retainer can be fitted to both surfaces of the rolling bearing and the inner surface of the retainer. Using a fixing element provided with a protruding portion for pressing the end face, the filled unfired raw material is pressed from both sides of the rolling bearing, and in that state, the unfired raw material is fired and fired. Thereafter, a manufacturing method is provided in which the fixing element is removed, and a portion of the fired lubricant-containing polymer member extending to an undesired space is optionally removed.

The advantages of this manufacturing method are as follows: (1) When the lubricant-containing polymer member is fired, the projecting portion of the fixing element presses and holds the end face of the cage from both sides, so that the cage can be properly positioned. That the baking can be performed while maintaining the temperature. (2) Since the fixing element pushes the lubricant-containing polymer member almost to the position of the end face of the cage, even if there is a portion to be removed after firing, the unnecessary portion of the lubricant-containing polymer member is relatively reduced, and the manufacturing cost is reduced. That can be reduced. It is.

The lubricant-containing polymer member used in the present invention may be a polymer selected from the group of poly-α-olefin polymers such as polyethylene, polypropylene, polybutylene, polymethylpentene and the like, and a lubricant such as poly-α-olefin oil as a lubricant. A mixture of paraffinic hydrocarbon oils, naphthenic hydrocarbon oils, mineral oils, ether oils such as dialkyldiphenyl ether oils, ester oils such as phthalate esters and trimellitate esters, alone or in the form of a mixed oil. Is preferably solidified by firing.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1A is a longitudinal sectional view of a rolling bearing according to a first embodiment of the present invention. The rolling bearing is a self-aligning roller bearing 1. As is well known, the self-aligning roller bearing 1 includes an outer ring 2 and an inner ring 3 facing each other with the same rotation axis C, and an outer ring 2 and an inner ring 3.
A plurality of rolling elements rotatably accommodated between the rollers, that is, rollers 4, and a retainer 5 for equally maintaining the plurality of rollers 4
And

As a characteristic configuration of the present invention, the lubricant-containing polymer member 6 is filled in the space up to both end surfaces of the retainer 5 in the direction of the rotation axis C. FIG. 1B is a part of a side view of the self-aligning roller bearing 1 shown in FIG. As is clear from the figure, the retainer 5 is exposed from the lubricant-containing polymer member 6.

FIG. 2 is a longitudinal sectional view of a rolling bearing according to a second embodiment of the present invention. The rolling bearing is a double row cylindrical roller bearing 7. FIG. 3 is a longitudinal sectional view of a rolling bearing according to a third embodiment of the present invention. The rolling bearing is a double-row type ball bearing 10.
In both FIG. 2 and FIG. 3, the lubricant-containing polymer member 6 is filled in the space up to both end surfaces of the cage 9 or the cage 12.

As described above, in any of the first, second, and third embodiments, the lubricant-containing polymer member 6 is filled in the space up to both end surfaces of the retainers 5, 9, and 12. .
Therefore, any of these embodiments has the following advantages as compared with the conventional rolling bearing. (1) Since the lubricant-containing polymer member 6 is filled only up to the position where the retainers 5, 9, and 12 exist in the direction of the rotation axis C, the lubricant-containing polymer member 6 is It is in a state of being supported by 9, 12 and is unlikely to be deformed by centrifugal force or the like. Therefore, breakage caused by deformation of the lubricant-containing polymer member 6 is unlikely to occur. (2) By providing a region in which the lubricant-containing polymer member 6 is not filled (for example, a region outside the retainers 5, 9, 12 with respect to the direction of the rotation axis C) in the support space,
The contact area between the roller surface and the raceway surface and the lubricant-containing polymer member 6 is reduced, and the friction can be reduced. Therefore, the temperature rise of the bearing due to friction can be reduced. There is an advantage.

Next, the operation of filling the rolling bearing according to the present invention with the lubricant-containing polymer member will be described. After the assembly of the bearing body is completed, the unsintered lubricant-containing polymer member 6 is filled in the support space of the bearing body. At this point, the rigidity of the lubricant-containing polymer member 6 is low, and there is a problem if firing is performed in this state. Therefore, fixing elements, that is, molds 13a and 13b as shown in FIG. 4 are used. The rolling bearing shown in FIG. 4 is the cylindrical roller bearing 7 of FIG. In the figure, a cylindrical roller bearing 7 has a support space sealed by two mold frames 13a and 13b which are fixing elements of a roller and a cage. Further, the filled lubricant-containing polymer member 6 is provided with protrusions 14a,
14b, the lubricant-containing polymer member 6 is pushed to the position of the end face of the retainer 9 except for the portion D in the figure. Also, FIG.
It is also a sectional view of cut line BB shown in FIG.

Here, referring to FIG.
b will be described. FIG. 5A is a part of a side view of the cylindrical roller bearing 7 shown in FIGS. 5 (b) and 5 (c) are longitudinal sectional views of the same formwork, and FIG. 5 (b) is a sectional view taken along the line AA in FIG. 5 (a). The sectional shape of the molds 13a and 13b at the same position as the position where the rollers 8 exist,
On the other hand, FIG. 5C shows the cross section taken along the line BB of FIG. 5A, that is, the cross-sectional shape of the molds 13a and 13b at the same position as the position where the retainer 9 exists. FIG.
As is clear from FIG. 5B and FIG.
The protruding portions 14a and 14b of the a and 13b have a two-stage height H1.
And H2. In addition, each projection portion 14
The heights H1, H2 of the respective projecting portions 14a, 14b and the end surfaces of the projecting portions 14a, 14b so that the end surfaces 15a, 15b of the a, 14b match the end surfaces of the rollers existing at that position or the end surfaces of the cage. The shapes of 15a and 15b are selected.

Accordingly, by firing the lubricant-containing polymer member 6 using the molds 13a and 13b, the rollers 8 and the retainer 9 are fixed and immovably held during firing. In other words, the lubricant-containing polymer member 6 can be fired while the rollers 8 and the retainer 9 are arranged at appropriate positions. In addition, a necessary portion of the lubricant-containing polymer member 6 is solidified into an inappropriate shape. Can be prevented.

When the firing is completed, the molds 13, 13 of FIG.
b is removed, and an unnecessary part of the solidified lubricant-containing polymer member 6, for example, a part D in FIG.
A polymer filled bearing as shown in FIG. 2 is completed. This method is also applicable to the operation related to the ball bearing 10 in FIG. That is, the ball 11 and the retainer 12 can be maintained at appropriate positions.

FIG. 6 shows the operation of filling and solidifying the lubricant-containing polymer member 6 into the self-aligning roller bearing 1 of FIG. FIG. 7 also shows the mold 16 shown in FIG.
It is a detailed view of a and 16b. The description of FIG. 7 is similar to that of FIG. Also in this case, the molds 16a, 1
Needless to say, the roller 4 and the retainer 5 can be held at appropriate positions by 6b. However, as in the case of the above-described ball bearing 8, the gap between the form, the rolling element, and the retainer is larger than that in the case of the cylindrical roller bearing.
Unnecessary portions of the lubricant-containing polymer member 6 that must be removed after firing are relatively large. However, in the case of filling and solidifying the lubricant-containing polymer member 6 with respect to the spherical roller bearing 1, a further solidifying method is conceivable. The method will be described below.

FIG. 8 shows the operation of filling the roller-containing polymer member into the self-aligning roller bearing 1 using the frames 17a and 17b. The frames 17a and 17b are in contact with the portions having the same role as the projecting portions 14a and 14b of the molds 13a and 13b shown in FIG. It has fixing portions 18a and 18b for fixing and holding the retainer 5. The fixing portions 18a and 18b have spherical portions 19a and 19b that come into contact with the inner surface 20 of the outer ring 2, and are formed so as to be compatible with the end faces of the rollers 4 or the retainers 5 at the positions where they are arranged. In addition, the frames 17a, 17b are
As shown in FIG. 8 (b), it is not an integral member as in FIG. 3b, but is a member that can be individually attached and detached.

FIG. 8 shows that the frames 17a, 17a,
FIG. 9 shows a state in which the frames 17a and 17b are assembled to the self-aligning roller bearing 1 with reference to FIG. However, in FIG. 9, the lubricant-containing polymer member is actually already filled, but is omitted in the figure.

First, as shown in FIG. 9A, the outer ring 2 is tilted to the same position as the end face of the cage. Next, FIG.
One frame 17b is assembled as shown in FIG. This time, as shown in FIG. 9C, the outer ring 2 is tilted in the opposite direction, and the other frame 17a is assembled. Then, the outer ring 2 is returned to the proper position again, and a state as shown in FIG. 8 is obtained. When the lubricant-containing polymer member of the spherical roller bearing is filled and fired by using this method, the unnecessary portion of the lubricant-containing polymer member that has to be removed after the firing is smaller than in the case of the method of FIG. Become.

Next, a fourth embodiment of the present invention will be described.
FIG. 10A is a longitudinal sectional view of a self-aligning roller bearing 30 according to a fourth embodiment of the present invention, and FIG. 10B is an EE cross-sectional view of the self-aligning roller bearing 30. The configuration of the self-aligning roller bearing 30 is substantially the same as that of the first embodiment. However, if the method of filling and solidifying the lubricant-containing polymer member by the method shown in FIGS. Since workability cannot be obtained, in the present embodiment, the disadvantages of the work shown in FIGS. 8 and 9 are improved by making the formwork simple.

When the self-aligning roller bearing 30 is filled with the unsintered lubricant-containing polymer member 6 and solidified, the spherical roller bearing 30 shown in FIG.
Formwork 37 not individually divided as shown in FIG.
a and 37b are used. That is, the formwork 37a, 37b
Are thin supporting portions 39a,
39b are formed, and the support portions 39a, 39b
Then, the retainer 35 is pressed from the left and right directions in the drawing, and the unfired lubricant-containing polymer member 6 is fired in this state. In this embodiment, since the supporting portions 39a and 39b of the retainer 35 are thin, the lubricant-containing polymer member 6 slightly remains in the lateral direction with respect to the direction of the rotation axis C from the retainer 35. After the firing is completed and the molds 37a and 37b are removed, unnecessary portions (such as the vicinity of the brim) remaining in the solidified lubricant-containing polymer member 6 are not removed. That is, the removal step is omitted to improve workability.

Next, a fifth embodiment of the present invention will be described.
FIG. 11A is a longitudinal sectional view of a double row cylindrical roller bearing 40 according to a fifth embodiment of the present invention, and FIG. 11B is a sectional view of the cylindrical roller bearing 40 taken along line FF. This cylindrical roller bearing 4
0 is almost the same as that of the second embodiment, but similarly to the above-described fourth embodiment, the thin supporting portions 49a, 49a, 48b formed on the projecting portions 48a, 48b of the mold frames 47a, 47b.
Since the unsintered lubricant-containing polymer member 6 is baked while supporting the retainer 45 with 49b, the lubricant-containing polymer member 6 slightly remains in the left-right direction with respect to the direction of the rotation axis C from the retainer 45. become. Also in the present embodiment, after the firing is completed and the molds 47a and 47b are removed, unnecessary portions (such as the vicinity of the brim) in the lubricant-containing polymer member 6 are not removed.

Next, a sixth embodiment of the present invention will be described. FIG. 12A is a longitudinal sectional view of a cylindrical roller bearing 50 according to a sixth embodiment of the present invention, and FIG.
GG sectional view of FIG. A characteristic configuration of the cylindrical roller bearing 50 is that rims 55a and 55b, which are end faces of a retainer 55 for equally disposing and holding the rollers 54, protrude from the rollers 6 in the direction of the rotation axis C. The lubricant-containing polymer member 6 is filled in the space up to the rims 55a and 55b of the retainer 55 in the direction of the rotation axis C.

FIG. 13 shows the cylindrical roller bearing 5 shown in FIG.
0 indicates the preferred filling position of the lubricant containing polymer member. Here, FIG. 13 corresponds to the portion surrounded by H in FIG. As shown in FIG. 13, the lubricant-containing polymer member 6 is filled only in the vicinity of the rims 55a and 55b of the retainer 55, and is not filled in other portions.
That is, unlike the configuration shown in FIG. 12, the rollers 54 can be held by the mold during firing.

The present invention is not limited to the above-described embodiment, but can be appropriately modified and improved. For example, it goes without saying that the present invention is not limited to the rolling bearing shown in the above-described embodiment, but can be applied to other rolling bearings. When the bearing is a combination bearing (separable double row bearing), it is preferable to combine the bearings after implementing the present invention for each rolling portion.

[0033]

As described above, according to the present invention, there is provided a rolling bearing characterized in that a lubricant-containing polymer member is filled and solidified to a position where a retainer exists substantially in the direction of the rotation axis of the bearing. Provided. In the rolling bearing, since the lubricant-containing polymer member is all supported by the retainer, it is unlikely to be deformed by centrifugal force or the like. Therefore, breakage caused by deformation of the lubricant-containing polymer member is unlikely to occur.

Further, by providing a region in the space not filled with the lubricant-containing polymer member, the contact area between the roller surface and the raceway surface and the lubricant-containing polymer member is reduced,
Friction can be reduced. Therefore, the temperature rise of the bearing due to friction can be reduced.

Further, in the rolling bearing of the present invention, by using the fixing element, it is possible to solidify the lubricant-containing polymer member in the rolling bearing while fixing and holding the cage. Is always placed in the proper position.

[Brief description of the drawings]

FIG. 1 is a part of a self-aligning roller bearing according to a first embodiment of the present invention, in which (a) is a longitudinal sectional view and (b) is a side view.

FIG. 2 is a part of a double row cylindrical roller bearing according to a second embodiment of the present invention.

FIG. 3 is a part of a double-row ball bearing according to a third embodiment of the present invention.

FIG. 4 shows an operation of filling and solidifying a lubricant-containing polymer member into the roller bearing of FIG. 2;

FIG. 5 is an explanatory view of a mold used for the operation of FIG. 4;
(A) is a side view of the bearing to which the mold is assembled, (b) is a sectional view of the mold at the same position as the rollers, and (c) is a sectional view of the mold at the same position as the cage.

FIG. 6 shows an operation of filling and solidifying a lubricant-containing polymer member into the spherical roller bearing of FIG.

FIG. 7 is an explanatory view of a mold used for the operation in FIG. 6;
(A) is a side view of the bearing to which the mold is assembled, (b) is a sectional view of the mold at the same position as the rollers, and (c) is a sectional view of the mold at the same position as the cage.

FIGS. 8A and 8B are explanatory views of a work of filling and solidifying a lubricant-containing polymer member into the self-aligning roller bearing of FIG. 1 and a top used in the work; FIG. 8A is a longitudinal sectional view, and FIG. FIG.

9A and 9B are explanatory diagrams of a work of assembling the spinning top to the self-aligning bearing, wherein FIG. 9A is a work of tilting the outer race, FIG. 9B is a work of assembling the spine, and FIG. is there.

10A is a longitudinal sectional view of a self-aligning roller bearing 30 according to a fourth embodiment of the present invention, and FIG. 10B is an EE cross-sectional view of the self-aligning roller bearing 30. .

11A is a longitudinal sectional view of a cylindrical roller bearing 40 according to a fifth embodiment of the present invention, and FIG. 11B is a sectional view of the cylindrical roller bearing 40 taken along line FF.

12A is a longitudinal sectional view of a cylindrical roller bearing 50 according to a sixth embodiment of the present invention, and FIG. 12B is a sectional view of the cylindrical roller bearing 50 taken along line GG.

FIG. 13 is a diagram corresponding to a portion surrounded by H in FIG. 12;

FIG. 14 is a conventional self-aligning bearing filled with a lubricant-containing polymer member, where (a) is a longitudinal sectional view and (b)
Is a side view thereof.

FIG. 15 is a conventional self-aligning bearing filled with a lubricant-containing polymer member, where (a) is a longitudinal sectional view and (b)
Is a side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Self-aligning roller bearing 2 Outer ring 3 Inner ring 4 Roller 5 Cage 6 Lubricant-containing polymer member 7 Double row cylindrical roller bearing 8 Roller 9 Cage 10 Double row ball bearing 11 Ball 12 Cage 13a, 13b Formwork 14a , 14b Projection part 15a, 15b End face of projection part 16a, 16b Formwork 17a, 17b Top 18a, 18b Fixing part 19a, 19b Spherical part 20 Inner surface of outer race 30 Self-aligning roller bearing 35 Retainer 37a, 37b Formwork 40 cylinder Roller bearing 45 Cage 47a, 47b Formwork 50 Cylindrical roller bearing 55 Cage AA Cross section at same position as rolling element BB Cross section at same position as cage C Rotation axis D Unnecessary portion of lubricant-containing polymer member

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C10M 107/02 C10M 107/02 109/00 109/00 143/00 143/00 // C10N 40:02 50 : 08 70:00 F term (reference) 3J101 AA02 AA13 AA15 AA24 AA25 AA32 AA42 AA43 AA52 AA54 AA62 CA12 EA53 FA32 4H104 BA02A BA07A BB08A BB33A CA01A CA01C DA02A JA01 PA01 QA23 RA03

Claims (1)

[Claims] An outer ring and an inner ring facing each other with the same rotation axis, a plurality of rolling elements rotatably housed between the outer ring and the inner ring, and holding the plurality of rolling elements. A rolling bearing in which a lubricant-containing polymer member is filled in a space formed between the outer ring, the inner ring, the rolling element, and the cage, wherein the lubricant-containing polymer member includes: A rolling bearing characterized by being filled and solidified substantially up to a position where the cage exists in the direction of the rotation axis.