JP2004232752A - Rolling bearing and its retainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further inexpensively manufacture a rolling bearing which prevents the occurrence of dropping of a rolling body by making a split type retainer to be simply assembled. <P>SOLUTION: The retainer is provided with a first split body 11, in which a plurality of separators 14 are integrally projected from the side face of an annular retaining ring 13 and a recessed storage part 15 for storing the rolling body 7 between each separator 14 is formed, a second split body 12 having an annular closing ring 16 with the same diameter as that of the retaining ring 13, and a connection means 17 for coaxially connecting the second split body 12 to the first split body 11. At least one of the first and second split bodies 11, 12 is formed of a material having solid lubrication properties in the retainer for the rolling bearing. The connection means 17 is composed of a latch protrusion 18 which is formed at the tip part of the separator 14 so as to prevent from coming off by being caught by the closing ring 16 by pushing the tip part of the separator 14 into the closing ring 16 side. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing and its cage used in, for example, a semiconductor manufacturing apparatus.
[0002]
[Prior art]
In semiconductor manufacturing equipment, evaporation and scattering of lubricant from the bearings can cause fatal defects in semiconductor products, so liquid lubricants cannot be used for rolling bearings. It is common to use a rolling bearing having a cage formed of a solid lubricating material. However, solid lubricant materials have problems such as being brittle and easily cracked and easily deformed.
As such a cage having solid lubricity, an integrated type is usually used, and this integrated type of cage has pockets having openings smaller than the diameter of the rolling elements at equal intervals in the circumferential direction. It is made of a crown-shaped ring member, and the rolling elements are forcibly fitted into the pocket portions to maintain the spacing between the rolling elements (see Patent Document 1).
[0003]
On the other hand, there is also a split type as a cage having solid lubricity, and this split type cage includes a pair of split bodies having semicircular recesses at equal intervals in the circumferential direction. By rolling them together with a large number of rivets, the rolling elements are housed in a plurality of circular pockets formed by joining the semicircular recesses to each other, and the spacing between the rolling elements is maintained. (See Patent Document 2).
[0004]
[Patent Document 1]
JP 7-217662 A (2-3 columns)
[Patent Document 2]
JP-A-7-269572 (Claim 1)
[0005]
[Problems to be solved by the invention]
Among the conventional cages described above, in the integrated type, when the rolling element is forcibly fitted into the pocket portion of the cage, the opening portion of the pocket portion is left open due to plastic deformation, This may cause rolling elements to fall off.
On the other hand, in the case of the split type, there is no such inconvenience, but since many rivets are adopted as means for joining the split bodies, there is a lot of labor for assembling the cage, and in this respect manufacturing of rolling bearings There is a disadvantage that the cost becomes high. In addition, when the entire cage is formed of a material having solid lubricity, the cage may be broken when the rivet is tightened.
[0006]
In view of such a situation, an object of the present invention is to manufacture a rolling bearing in which a rolling element does not drop off at a lower cost so that a split cage can be easily assembled.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention takes the following technical means.
That is, the present invention provides a first divided body in which a plurality of separators are integrally projected from a side surface of an annular holding ring and a storage recess for storing a rolling element is formed between the separators; A rolling bearing comprising: a second divided body having an annular closing ring having the same diameter as the holding ring; and a connecting means for connecting the second divided body coaxially to the first divided body In the cage, the connecting means is constituted by a latching protrusion formed at the tip of the separator so as to be caught by the stopper ring by pushing the tip of the separator toward the closure ring. It is characterized by that.
[0008]
In this case, the latching protrusion formed on the leading end of the separator is hooked on the closing ring by pushing the leading end of the separator toward the closing ring, so that it is prevented from coming off. The first divided body and the second divided body can be connected with one touch only by pressing the stop protrusion toward the closing ring. For this reason, compared with the conventional case where the divided bodies are coupled with rivets, the divided bodies can be more easily coupled with each other, and the assembly work of the split type retainer becomes easier. Further, the cage is not cracked due to rivet tightening during assembly.
[0009]
More specifically, the latching projections having the above-described effects are provided on the body part integrally formed at the tip of the separator so as to be elastically deformable in the radial direction of the closing ring, and on the radially inner edge of the closing ring. A hook that is integrally formed at the front end of the body so as to be hooked, and a cam surface that is formed on the hook so as to be inclined inwardly toward the front end. Can be adopted.
[0010]
And when adopting such a latching projection, if a housing recess is formed in which the barrel portion fits in a position corresponding to the trunk portion on the radially inner edge of the closing ring, the barrel portion of each latching projection is formed. When the latching hook of the latching projection is hooked on the closing ring in the state of being housed in the storage groove, the second divided body moves relative to the first divided body in the circumferential direction, and the latching hook is unexpectedly detached. In this respect, it is possible to improve the durability of the rolling bearing.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a cross-sectional view of a solid lubrication type rolling bearing 2 having a cage 1 according to the present invention, and this bearing 2 requires a clean environment such as a disk rotating part and a conveying part of a semiconductor manufacturing apparatus. It is used for the site to do.
As shown in FIG. 2, the rolling bearing 2 of the present embodiment is fitted to the outer ring 4 having the inner race 3 on the inner peripheral surface, the inner ring 6 having the outer race 5 on the outer peripheral surface, and the inner race 3 and the outer race 5. A plurality of rolling elements 7 which are in rolling contact with the outer ring 4 and the inner ring 6 in a state of being inserted, and a retainer 1 for holding the circumferential interval between the respective rolling elements 7 are provided.
[0012]
Among these, the inner race 3 and the outer race 5 are formed of groove portions having a cross-sectional shape curved with substantially the same curvature as the spherical rolling elements 7, and the rolling elements 7 are fitted into the races 3 and 5, respectively. And the relative movement of the inner ring 6 in the axial direction (left-right direction in FIG. 2) are restricted. In addition, the rolling element 7 consists of spherical bodies, such as a steel ball or a ceramic ball. Although not shown, a solid lubricating film made of tetrafluoroethylene resin, graphite, molybdenum disulfide, tungsten disulfide, or the like is formed on the surfaces of both races 3, 5 and rolling elements 7, Thus, the lubricating action between the outer ring 4 and the inner ring 6 and the rolling element 7 is maintained for a long period of time.
[0013]
On the other hand, the cage 1 of the present embodiment is a split type composed of a pair of front and back first divided bodies 11 and second divided bodies 12 that are divided in the axial direction. And a synthetic resin containing a solid lubricating material such as tetrafluoroethylene resin, graphite, molybdenum disulfide, and tungsten disulfide. Note that only one of the divided bodies 11 and 12 may be given solid lubricity. As shown in FIG. 1, among the divided bodies 11 and 12, the first divided body 11 includes an annular holding ring 13 and a plurality of quadrangular prisms that are integrally projected from the side surface of the holding ring 13. A separator 14 is provided, and a storage recess 15 for storing the rolling element 7 is formed between the separators 14.
[0014]
On the other hand, the second divided body 12 is composed of only an annular closing ring 16 having the same diameter as the holding ring 13, and the separator 14 is not projected from the closing ring 16. The cage 1 of the present embodiment includes a connecting means 17 for connecting the second divided body 12 to the first divided body 11 coaxially, and the connecting means 17 projects from the tip of each separator 14. It consists of the latching protrusion 18 made.
[0015]
And the latching protrusion 18 of this embodiment is latched by the trunk | drum 19 integrally formed in the front-end | tip of the separator 14 so that it can be elastically deformed to the radial direction of the closure ring 16, and the radial inner edge of the closure ring 16. A latching hook 20 that is integrally formed at the distal end of the body portion 19 and a cam surface 21 that is formed on the latching hook 20 so as to incline radially inward toward the distal end side are provided.
[0016]
Therefore, when the two divided bodies 11 and 12 are joined to each other so that the leading end of the separator 14 is pushed toward the closing ring 16 side, the cam surface 21 of the latching protrusion 18 comes into contact with the radially inner edge of the closing ring 16. Then, the body portion 19 of the latching protrusion 18 is elastically deformed radially inward, and thereafter, when the cam surface 21 is terminated, the body portion 19 is restored and deformed outwardly of the diameter, whereby the hook 20 of the latching protrusion 18 is closed. It is hooked by the inner diameter edge of 16 and is prevented from coming off.
[0017]
As described above, according to the cage 1 according to the present embodiment, the first divided body 11 and the second divided body 12 can be connected with one touch only by pressing each latching protrusion 18 toward the closing ring 16. Therefore, the divided bodies 11 and 12 can be more easily coupled to each other than in the conventional case where the divided bodies are coupled by rivets, and the assembly work of the split type retainer 1 can be performed more easily. It can be carried out.
[0018]
Further, in the present embodiment, the storage groove portion 22 having a radial depth equal to or greater than the radial cross-sectional height of the body portion 19 at the circumferentially equidistant position corresponding to each body portion 19 at the radially inner edge of the closing ring 16. The hooks 20 of the latching protrusions 18 are hooked on the closing ring 16 in a state where the body portions 19 are housed in the housing groove portions 22, respectively. For this reason, after the latching protrusion 18 is fitted and the two divided bodies 11 and 12 are joined, the second divided body 12 does not move relative to the first divided body 11 in the circumferential direction. It is possible to prevent the stop hook 20 from being unexpectedly detached from the closing ring 16 in advance.
[0019]
The above-described embodiments are all illustrative and not restrictive. The scope of the present invention is defined by the claims, and all modifications within the scope equivalent to the configurations described therein are also included in the present invention.
For example, in the illustrated embodiment, the second divided body 12 is constituted only by the closing ring 16, and the latching protrusion 18 of the first divided body 11 is hooked on the radially inner edge of the closing ring 16. A separator may also be formed on the two-divided body 12, and the latching protrusion 18 of the first divided body 11 may be connected to the separator.
[0020]
In addition, as shown in FIG. 3, the second divided body 12 has the same shape and dimensions as the first divided body 11 by forming the separator 14 with the latching protrusions 18 on the closing ring 16 of the second divided body 12. The cage 1 may be assembled by connecting both the divided bodies 11 and 12 so that the separators 14 are alternately arranged in the circumferential direction. In this case, since the 1st division body 11 and the 2nd division body 12 can be comprised with the same member, the number of parts can decrease and manufacturing cost can be reduced more. In the modification shown in FIG. 3, the storage recess 22 is formed on the inner diameter edge of the holding ring 13 and the closing ring 16. However, the storage recess 22 may be omitted.
[0021]
On the other hand, in the modified example shown in FIG. 3, since the two rolling elements 7 and 7 are accommodated between the separators 14 and 14 in the same direction, the ball split ribs 23 swell on the opposing inner surfaces of the holding ring 13 and the closing ring 16. Thus, the two rolling elements 7, 7 are naturally distributed in the circumferential direction when the cage 1 is assembled. The top surface of the cleave rib 23 is formed in the same shape as the tip edge of the separator 14, and when the first and second divided bodies 11, 12 are connected to each other, the tip edge of each separator 14 becomes the cleave rib 23. It is designed to be joined to the top surface of the plate.
[0022]
【The invention's effect】
As described above, according to the present invention, the split type cage can be assembled more simply than before, so that it is possible to manufacture a rolling bearing at which the rolling elements do not fall off at a lower cost.
[Brief description of the drawings]
FIG. 1 is an assembled perspective view showing a coupling operation of a cage.
FIG. 2 is a cross-sectional view of a solid lubrication type rolling bearing.
FIG. 3 is an assembled perspective view showing a modified example of the cage.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cage 2 Rolling bearing 3 Inner race 4 Outer ring 5 Outer race 6 Inner ring 7 Rolling body 11 First divided body 12 Second divided body 13 Holding ring 14 Separator 15 Storage recess 16 Closure ring 17 Connecting means 18 Locking protrusion 19 Trunk part 20 Latch hook 21 Cam surface 22 Storage recess

Claims (4)

A plurality of separators (14) project integrally from the side surface of the annular holding ring (13), and a storage recess (15) for storing the rolling element (7) is formed between the separators (14). The first divided body (11), the second divided body (12) having an annular closing ring (16) having the same diameter as the retaining ring (13), and the second divided body (12) Connecting means (17) for connecting to the first divided body (11) coaxially, and at least one of the first and second divided bodies (11, 12) is a solid lubricating material In the rolling bearing cage formed by
The connecting means (17) is configured such that the tip of the separator (14) is prevented from being pulled out by being caught by the closing ring (16) by pushing the tip of the separator (14) toward the closing ring (16). A cage for a rolling bearing, characterized in that it comprises a latching protrusion (18) formed on the portion. The latching protrusion (18) includes a body (19) integrally formed at the tip of the separator (14) so as to be elastically deformable in the radial direction of the closing ring (16), and the diameter of the closing ring (16). A hook hook (20) integrally formed at the tip of the body (19) so as to be hookable on the inner edge, and the hook hook (20) so as to incline radially inward toward the tip side. The rolling bearing retainer according to claim 1, further comprising a cam surface (21) formed on the bearing. The holding for a rolling bearing according to claim 2, wherein a housing recess (22) into which the body (19) is just fitted is formed at a position corresponding to the body (19) at the inner diameter edge of the closing ring (16). vessel. The outer race (4) having the inner race (3) on the inner peripheral surface, the inner race (6) having the outer race (5) on the outer peripheral surface, and the inner race (3) and the outer race (5) And a plurality of rolling elements (7) that are movably in contact with the outer ring (4) and the inner ring (6), and a cage (1) for maintaining the circumferential interval between the rolling elements (7). In the rolling bearing provided,
A rolling bearing according to claim 1, wherein the cage (1) comprises the cage according to claim 1.

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