JP2006292097A - Cage for rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure rigidity and strength to centrifugal load in high-speed rotation. <P>SOLUTION: This cage for a rolling bearing comprises a pair of annular portions 20, 22 axially opposite to each other and a plurality of pillar portions 24 arranged between both annular portions at equal intervals in the circumferential direction and connecting both annular portions, and is constituted by two divisional bodies 28, 30 respectively comprising divisional parts of the annular portions and the pillar portions by axially dividing them from midway positions of the pillar portions. Connecting portions 241c, 241d, 242c, 242d mutually connected with each other in the radial direction are formed on an inner diameter-side of divisional faces of the divisional bodies, and both divisional bodies are connected by connecting the connecting portions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rolling bearing retainer (hereinafter referred to as a retainer) that retains rolling elements between an inner ring and an outer ring.

  Some cages such as ball bearings or roller bearings are made of resin for the purpose of weight reduction. In the case of a resin cage, the rigidity is inferior. Therefore, especially in the case of a cage made of resin that is long in the axial direction, it is easily deformed to the outer diameter side due to the action of a centrifugal load under high-speed rotation. In this case, when the condition of high temperature environment is added, it becomes easier to deform. The deformation of the cage deteriorates the bearing performance, for example, the contact surface between the cage and the rolling element is displaced from the normal position to increase the rotational torque.

  Among such resin cages, there are some which are divided cages for the purpose of assembling, mass production, and handling (see Patent Document 1 and the like). The cage of Patent Document 1 has a structure in which two cage halves (annular parts) are connected by pins and sockets, and the circumferential width of the connecting part (corresponding to the column part) becomes large, so that the rolling elements are stored. The number decreases. Further, in the cage of Patent Document 2, a pair of opposing claws are provided at equal intervals in the circumferential direction on one side surface of the annular cage body, and a ball holding pocket is formed between the pair of claws. An annular lid is connected to the pocket opening side, the rigidity and strength of the annular part at the connecting part position are reduced, and the centrifugal load is inferior. The cage of Patent Document 3 has a configuration in which the rigidity and strength of the annular portion are reduced.

  As described above, in the resin cage, it is necessary to consider the lack of rigidity and strength under high-speed rotation due to being made of resin, but in the case of the split type, it is necessary to secure the strength of the connecting portion. In production, the number of moving objects stored may be reduced, or the structure may be complicated, while maintaining the number of moving objects stored may reduce rigidity and strength. Have difficult challenges.

  In addition, it is conceivable that the cage is a split type in which only one of the two annular portions can be divided and the divided annular portion is connected to the tip portion of the column portion during assembly. However, there is a risk that the connecting part whose strength is structurally insufficient will be concentrated only on the one annular part, and the weight of the cage on both sides in the axial direction is difficult to be balanced due to the deviation of the connecting part, so This will leave the above-mentioned problems. In order to solve the above-mentioned problem, it is necessary to avoid an increase in the weight of the cage due to the incorporation of the connecting portion in order to suppress an increase in centrifugal load.

Furthermore, the above is not necessarily limited to resin cages, but is similarly derived from cages that may be deformed by centrifugal loads, such as copper alloy machined cages. This is a possible issue.
Japanese Examined Patent Publication No. 47-19123 Japanese Utility Model Publication No. 06-1848 JP 2003-343571 A

  The problem to be solved by the present invention is that the number of rolling elements accommodated does not decrease, the cage does not increase in weight, and is not easily deformed even when subjected to a centrifugal load during high-speed rotation, and the required rigidity and strength It is an object of the present invention to provide a cage capable of ensuring the above.

  A rolling bearing retainer according to the present invention includes a pair of annular portions facing in parallel in the axial direction and an annular portion extending between the annular portions in the axial direction and arranged at equal intervals in the circumferential direction. A rolling bearing retainer comprising a plurality of pillar portions integrated with the ring portion, and forming a pocket for retaining a rolling element in a space between the circumferential directions of the plurality of pillar portions. Are divided in the axial direction from the middle position of each part, and each of them is provided with an annular part and an axially divided part (column divided part) of the column part, and is superimposed in the radial direction on the inner diameter side of the end surface on the front end side of both column divided parts It is comprised from two division bodies provided with the connection part mutually connected.

  The cage for rolling bearings of the present invention is a cage that can be applied to all rolling bearings such as ball bearings and roller bearings, and is not limited to the material thereof.

  The cage for a rolling bearing according to the present invention is not an unbalanced division / assembly configuration in which one divided body is only an annular portion, and two divided bodies are each provided with an annular portion and a column divided portion. Since it has a split / assembled configuration with one ring, when one split body has a ring structure, for example, a roller bearing retainer, when applied to a configuration with a long roller length, Only the column part of the divided body is formed long, and as a result, the rigidity and strength of the column part may be reduced. However, in the cage of the present invention, deformation is prevented by centrifugal load acting at high speed rotation by setting the division position. Therefore, it is possible to easily ensure a weight balance that is extremely important for this purpose. Also particularly important is that the position of the connecting portion can be balanced over the entire axial direction. Therefore, it becomes possible to effectively prevent deformation against a centrifugal load during high-speed rotation. Of course, since the connecting portions of the two divided bodies overlap in the radial direction, the anti-centrifugal load resistance is enhanced, and the axial connecting force can be secured.

  As described above, in the present invention, both of the divided bodies have an unprecedented structure in which not only the annular portion but also the column divided portion is provided, and the axial length of the column divided portion is set. Thus, in addition to suppressing the decrease in rigidity and strength of the column part, it is possible to set a balance between rigidity and strength in the axial direction and in the circumferential direction. That is, according to the present invention, for example, the length in the axial direction of the pillar dividing portion can be set longer every other circumferential direction or every plural number, and shorter every other circumferential direction or every other plural number. . With this setting, the position of the connecting part becomes a perspective equilibrium with respect to both annular parts alternately in the circumferential direction, and the position of the position where the centrifugal load changes due to fluctuations in the rotational speed during high-speed rotation and the position where the centrifugal load changes. It can be balanced over a long period of time with respect to movement, etc. (due to the position of rolling elements in the pocket, deformation, viscosity change such as lubricant, transition of environmental temperature, etc.).

  As described above, according to the present invention, the connection strength at the connecting portion of the column split portion in spite of the split type in response to the change in the strength of the centrifugal load, the change in the ambient temperature, and the environmental change in the mounting position of the rolling bearing. In addition, the rigidity and strength of the pillar part itself composed of both pillar split parts can be ensured. In particular, even if the cage material is made of a material such as a resin that is required to have rigidity and strength, the number of rolling elements can be maintained and the cage can be deformed without increasing the weight of the cage. It is difficult to provide a cage that can suppress an increase in torque.

  As one aspect of the present invention, the column division portion of one divided body is a combination of a long column division portion and a short column division portion arranged in the circumferential direction alternately arranged in the circumferential direction, and the column division portion of the other division body Is a combination of axially long column divided portions and short column divided portions arranged alternately in the circumferential direction, and one of the two connecting portions includes an engaging claw portion, and the other includes the engaging claw portion. A locking recess to be inserted, and a locking portion that is provided in the locking recess and locks in a state where the engaging claw overlaps in the radial direction and is prevented from coming off in the axial direction.

  As one aspect of the present invention, one divided body includes a first column dividing portion pair in which a long column dividing portion and a short column dividing portion are integrally arranged in one side in the circumferential direction in this order. The other divided body includes a second column divided portion pair in which a column divided portion which is short in the axial direction and a long column divided portion are integrally arranged in one side in the circumferential direction in this order. The 2nd pillar division part pair is mutually connected by the mutual connection part.

  According to this aspect, since the column split portions that are long in the axial direction in the circumferential direction are arranged in parallel, the rigidity and strength of the column portions can be improved.

  As one aspect of the present invention, a radially inward stepped portion is provided on the outer diameter side of the long column division portion, and the extension portion is formed by extending the outer diameter side of the short column division portion in the axial direction. Yes, the extension is superimposed on the step from the radial direction.

  According to this aspect, it is possible to receive a large centrifugal load due to the overlapping of the stepped portion and the extending portion, and it is possible to use the connecting portion as the circumferential positioning of both divided bodies.

  According to the present invention, it is possible to provide a cage having rigidity and strength that is less likely to be deformed with respect to a centrifugal load during high-speed rotation without reducing the number of rolling elements stored and without increasing the weight. it can.

  Hereinafter, a cage according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment 1)
1 is a cross-sectional view of a rolling bearing provided with the cage of Embodiment 1, FIG. 2 is a perspective view of the cage shown in FIG. 1, FIG. 3 is a perspective view of a divided body of the cage, and FIG. It is AA sectional view taken on the line of 2. FIG.

  Referring to these drawings, a rolling bearing 10 is a deep groove type ball bearing, and includes an outer ring 12, an inner ring 14, and a plurality of rolling elements (balls) 16 interposed between the outer ring 12 and the inner ring 14. And a split type retainer 18 that holds the plurality of rolling elements 16 in a freely rollable manner. The cage 18 is made of resin, and in an assembled state, the first and second annular portions 20 and 22 that face each other in the axial direction, and a plurality of the annular portions 20 and 22 that are arranged at equal intervals in the circumferential direction. The holes 24 between the two annular portions 20 and 22 and the column portion 24 are pockets 26 for holding rolling elements. The rolling element 16 is held in the pocket 26 by annular portions 20 and 22 on both sides in the axial direction and column portions 24 on both sides in the circumferential direction.

  The cage 18 includes two divided bodies 28 and 30 that are divided in the axial direction from the middle position of the column portion 24. The first divided body 28 includes an annular portion 20 and a column portion (hereinafter referred to as a column divided portion) 241 that extends from the divided position where the column portion 24 is divided in the axial direction to the one side in the axial direction and has a substantially rectangular cross-sectional outer shape. With. The front end surface of the column dividing portion 241 becomes a dividing surface. Each of the column division portions 241 has a different length in the axial direction alternately in the circumferential direction. In other words, the column dividing portion 241 includes a column dividing portion having a long axial length every other circumferential direction (hereinafter referred to as a long column dividing portion) 241a and a column having a short axial length every other circumferential direction. It is set as the division part (henceforth a short pillar division part) 241b. The long column division portion 241a and the short column division portion 241b are provided with connecting portions 241c and 241d on the inner diameter side of the front end surface.

  The second divided body 30 includes an annular portion 22 and a column division portion 242 that extends from the division position divided in the axial direction of the column portion 24 to the other side in the axial direction and has a substantially rectangular cross-sectional outer shape. The front end surface of the column division part 242 becomes a division surface. As with the column division portion 241, the column division portions 242 also have different lengths in the axial direction alternately in the circumferential direction. In other words, the column dividing portions 242 are formed as long column dividing portions 242a every other circumferential direction and short column dividing portions 242b every other circumferential direction. The long column division portion 242a and the short column division portion 242b are provided with connecting portions 242c and 242d on the inner diameter side of the front end surface.

  The connecting portions 241c and 242c of the respective long column division portions 241a and 242a are smaller in cross-sectional dimension than the long column division portions 241a and 242a from the inner diameter side of the end surface on the front end side (small in both radial and circumferential directions). ), And a radially outwardly engaging claw portion c2 that is elastically deformable and rises radially outward from the outer diameter surface of the axial end portion of the barrel portion c1. Is provided. The outer diameter surface of the engaging claw c2 is a cam surface c3 that is a slope that descends radially inward toward the tip end in the axial direction.

  The connecting portions 241d and 242d of the respective short column division portions 241b and 242b are axially extended from the inner diameter side of the inner side surface of the short column division portions 241b and 242b to the inner diameter side of the outer side surface of the annular portions 20 and 22. It has a locking recess d1 that is cut out. The locking recess d1 includes a locking part d2 having a substantially semicircular or semi-elliptical or parabolic cross section that falls radially inward from an inner bottom surface facing inward in the radial direction. When the engaging claw portions c2 of the coupling portions 241c and 242c of the long column division portions 241a and 242a are inserted into the locking recesses d1 of the coupling portions 241d and 242d of the short column division portions 241b and 242b, the cam surface c3 hits the front surface of the locking portion d2 in the locking recess d1. Due to this contact, the engaging claw portion c2 elastically deforms radially inward to overcome the locking portion d2, and when it gets over, it is elastically restored and locked to the back side of the locking portion d2. The stopper part d2 is connected to the stopper part d2 so as to prevent it from coming off in the axial direction and overlapping from the radial direction.

  In the above-described configuration, the first and second divided bodies 28 and 30 include the engaging claw portions c2 of the connecting portions 241c and 242c of the long column divided portions 241a and 242a and the connecting portions 241d of the short column divided portions 241b and 242b. , 242d of the respective locking recesses d1 are connected to each other in the axial direction so that the end surfaces of the column split parts 241 and 242 are abutted in the axial direction and locked and connected.

  In the cage 18 of the first embodiment described above, each of the connecting portions 241c of the long column dividing portion 241a of the first divided body 28 and each of the connecting portions 242d of the short column dividing portion 242b of the second divided body 30 are mutually connected. Further, by connecting the connecting portions 241d of the short column dividing portions 241b of the first divided body 28 and the connecting portions 242c of the long column dividing portions 242a of the second divided body 30, respectively, both the divided bodies 28 are connected. , 30 can be connected.

  In this case, since the long column division parts 241a and 242a of the first division bodies 28 and 30 are provided alternately in the circumferential direction, the rigidity of the column part 24 is maintained even if the axial length of the cage 18 is increased. , Strength does not decrease.

  Further, since the connecting portions 241c, 241d, 242c, and 242d are equal to or smaller than the cross-sectional dimensions of the column dividing portions 241, 242, the cross-sectional dimensions of the column dividing portions 241, 242 are not provided even if the connecting portions 241c, 241d, 242c, 242d are provided. Since the width does not increase, the circumferential width of the pocket 26 can be maintained, and as a result, the number of the rolling elements 16 stored does not decrease.

  Further, the connecting portions 241c and 242c are composed of a body portion c1 and an engaging claw portion c2, and these connecting portions 241c and 242c are accommodated in the locking recesses d1 of the connecting portions 241d and 242d. The dimensions do not increase and the weight of the cage 18 does not increase.

  In particular, in the cage 18 of the first embodiment, since both the divided bodies 28 and 30 have the same shape, the divided bodies 28 and 30 can be manufactured with one type of mold, and the manufacturing cost is greatly reduced. can do.

(Embodiment 2)
FIG. 5 relates to the cage of the second embodiment, FIG. 5 (a) is a partial perspective view of one divided body 28, FIG. 5 (b) is a partial perspective view of the other divided body 30, and FIG. FIG. 4 is a partial perspective view of a cage in which both divided bodies 28 and 30 are connected. In these drawings, parts corresponding to those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description of the parts related to the same reference numerals is omitted.

  With reference to FIG. 5A to FIG. 5C, a stepped portion 40 that falls radially inward is provided on the outer diameter surface of the long column division portion 241 a of the first division body 28. On the other hand, the height of the stepped portion 40, that is, the thickness of the short column divided portion 242b of the second divided body 30 corresponding to the thickness reduced by providing the stepped portion 40 in the long column divided portion 241a. An extension 44 extending in the axial direction with a thickness corresponding to the above is provided. And the long column division part 241a and the short column division part 242b are faced | matched by the axial direction so that the extension part 44 may overlap on the step part 40. FIG. Accordingly, the centrifugal load acting on the long column division portion 241a of the first division body 28 can be received by the extension portion 44 of the short column division portion 242b of the second division body 30.

  Similarly to the first divided body 28, a step 46 and an extension 42 are provided on the long column division 242 a of the second division 30 and the short column division 241 b of the first division 28, respectively. 46, the extension 42 is engaged in the radial direction so that the centrifugal load acting on the long column division 242a of the second divided body 30 can be received by the extension 42 of the short column division 241b of the first divided body 28. Like that.

  With the above configuration, since both the divided bodies 28 and 30 can receive the centrifugal load by the extension portions 44 and 42 on the other side, the deformation due to the centrifugal load can be more effectively suppressed or prevented, and the connection in this case The portions 241c, 241d, 242c, and 242d can be used for circumferential positioning by restricting the circumferential displacement of the two divided bodies 28 and 30.

(Embodiment 3)
6 is a partial perspective view of the cage of the third embodiment, FIG. 7 is a partial perspective view of a divided body of the cage, FIG. 8 is a cross-sectional view taken along the line BB of FIG. 6, and FIG. It is CC sectional view taken on the line. In these drawings, parts corresponding to those in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description of parts corresponding to the same reference numerals is omitted. In the cage according to the third embodiment, the first divided body 28 is a first pillar divided portion pair 25a in which a long column divided portion 241a and a short column divided portion 241b are adjacently arranged in the circumferential direction. In the second divided body 30, a long column division portion 242a and a short column division portion 242b are second column division portion pairs 25b arranged adjacently in the circumferential direction. In the first column dividing portion pair 25a of the first divided body 28, the long column dividing portion 241a and the short column dividing portion 241b are arranged in parallel in this order in one circumferential direction, and the second column dividing portion of the second divided body 30 is arranged. In the pair 25b, a short column division portion 242b and a long column division portion 242a are arranged in parallel in this order on one side in the circumferential direction. The inner side surfaces of the long column division portions 241c and 242c are used as the partial side walls of the recesses d1 of the connecting portions 241d and 242d of the short column division portions 241b and 242b, respectively. The long column division parts 241a and 242a and the short column division parts 241b and 242b are provided with a connection part similar to that of the first embodiment.

  At the time of assembly, the first divided body 28 and the second divided body 30 are arranged opposite to each other in the axial direction, and the respective connecting portions are interconnected to connect the divided bodies 28 and 30 to assemble the cage.

  In the cage of the third embodiment described above, since the long column division parts 241a and 242a of the first divided body 28 and the second divided body 30 are adjacent to each other in the circumferential direction, the rigidity and strength of the column parts are improved. .

(Embodiment 4)
FIG. 10 is a partial perspective view of the cage of the fourth embodiment, and FIG. 11 is a partial perspective view of both divided bodies of the cage of FIG. In these drawings, parts corresponding to those in FIGS. 1 to 9 are denoted by the same reference numerals, and detailed description of parts corresponding to the same reference numerals is omitted.

  In the fourth embodiment, similar to the cage of the third embodiment, the first pillar divided portion pair 25a is provided on the first divided body 28 side, and the second pillar divided portion pair 25b is provided on the second divided body 30 side. Prepare. In the fourth embodiment, in the same manner as in the second embodiment, each of the long column division portion 241a of the first divided body 28 and the long column division portion 242a of the second divided body 30 is provided with radial step portions 40, 46, and extending portions 42 and 44 extending in the axial direction are provided on each of the short column division portion 241b of the first divided body 28 and the short column division portion 242b of the second divided body 30, and these step portions 40 and 46 are provided. The extension portions 44 and 42 are engaged with each other in the radial direction, and the extension portions 44 and 42 receive a centrifugal load.

  With the above configuration, in Embodiment 4, since the long column divided portions 241a and 242a of the first divided body 28 and the second divided body 30 are adjacent to each other in the circumferential direction, the rigidity and strength of the column portions are improved. In addition, since the divided bodies 28 and 30 are supported by the extension portions 44 and 42 on the opposite side, the deformation due to the centrifugal load can be more effectively suppressed or prevented. Due to the connecting portions 241c, 241d, 242c, and 242d, the circumferential displacement of both the split bodies 28 and 30 is more strongly regulated and positioned in the circumferential direction.

FIG. 3 is a cross-sectional view of a rolling bearing provided with the cage according to the first embodiment. It is a perspective view of the holder | retainer shown in FIG. It is a perspective view of the division body of the holder. It is the sectional view on the AA line of FIG. (A) Partial perspective view of the first divided body of the cage of the second embodiment, (b) Partial perspective view of the second divided body, (c) Assembling the first divided body and the second divided body by connecting them. FIG. It is a fragmentary perspective view of the holder | retainer of Embodiment 3. It is a fragmentary perspective view of the division body of the holder | retainer of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is a fragmentary perspective view of the holder | retainer of Embodiment 4. It is a fragmentary perspective view of both the division bodies of the holder | retainer of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rolling bearing 18 Cage 20 Ring part 22 Ring part 24 Column part 241a Long column division part 241b Short column division part 241c Connection part 241d Connection part 242a Long column division part 242b Short column division part 242c Connection part 242d Connection part 28 1st division body 30 2nd division body

Claims (4)

A pair of annular parts facing in parallel in the axial direction and a plurality of pillars extending between the annular parts in the axial direction and arranged at equal intervals in the circumferential direction and integrated with both annular parts A rolling bearing retainer that constitutes a pocket that holds a rolling element in a hole between circumferential directions of a plurality of column parts,
The cage is divided in the axial direction from the midway position of the column part, each comprising an annular part and an axially divided part (column split part) of the column part, and the inner diameter side of the end surface on the front end side of both column split parts A cage for a rolling bearing, characterized in that the cage is composed of two divided bodies each having a connecting portion that is overlapped in the radial direction and connected to each other.   It is a combination of an axially long column division part and a short column division part in which the column division parts of one division are alternately arranged in the circumferential direction, and the column division parts of the other division are arranged alternately in the circumferential direction. A combination of an axially long column dividing portion and a short column dividing portion, and one of the connecting portions includes an engaging claw portion, and the other is a locking recess into which the engaging claw portion is inserted. The rolling device according to claim 1, further comprising: a locking portion provided in the locking recess and locking in a state where the engaging claw portion overlaps in a radial direction and is prevented from coming off in an axial direction. Bearing cage.   One divided body includes a first column divided portion pair in which a long column divided portion and a short column divided portion are integrally arranged in one circumferential direction in this order, and the other divided portion is axially Each of the first and second column splitting portions is provided with a second column splitting portion pair in which a short column splitting portion and a long column splitting portion are integrally arranged side by side in this order. The cage for rolling bearings according to claim 2, wherein the cages are connected to each other at the connecting portions.   A radially inward step portion is provided on the outer diameter side of the long column division portion, and an extension portion is formed by extending the outer diameter side of the short column division portion in the axial direction, and the extension portion is formed on the step portion. The rolling bearing retainer according to claim 2 or 3, wherein the bearings are superposed in a radial direction.

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