WO2014088059A1

WO2014088059A1 - Ball bearing cage, and cage and roller

Info

Publication number: WO2014088059A1
Application number: PCT/JP2013/082677
Authority: WO
Inventors: 近藤　豊
Original assignee: 日本精工株式会社
Priority date: 2012-12-06
Filing date: 2013-12-05
Publication date: 2014-06-12
Also published as: JP2016029285A

Abstract

In the present invention, a plurality of elastic deformation sections (17) that contract or elongate in the peripheral direction are provided along the peripheral direction. The elastic deformation sections (17) have a pair of elastic deformation pieces (17a) that have the same shape, and, with each end (15b) of an arced section (15a) that is neighboring in the peripheral direction as the base section, each extend inwards in the axial direction from each end (15b), the extending portions being linked in the peripheral direction. The elastic deformation sections (17a) are formed symmetrically with respect to the intermediate portion (C) in the axial direction.

Description

Cage and roller

The present invention relates to a radial roller (including needle) bearing cage made of synthetic resin, and an improvement of a cage and roller in which the roller is assembled to the cage.

A cage and roller 100 as shown in FIGS. 8 and 9 is incorporated in a portion to which a large radial load is applied among the rotation support portions of various mechanical devices. The cage-and-roller 100 includes a cylindrical outer ring raceway 103 provided on an inner peripheral surface of an outer diameter side member 102 such as a housing (or a gear, a roller, or an outer ring that rotates during use) that does not rotate during use. A plurality of rollers (needles) 106 are provided between the inner ring raceway 105 having a cylindrical surface provided on the outer peripheral surface of the shaft 104 such as a shaft (or a support shaft or an inner ring). The plurality of rollers 106 are provided so as to roll while being held by a cage 107.

Further, the cage 107 is entirely formed in a cylindrical shape by a synthetic resin material such as glass fiber reinforced plastic. Such a cage 107 is arranged between a pair of

rim portions

108 and 108 that are arranged concentrically with each other in an axial direction and are annular, and between the

rim portions

108 and 108. A plurality of

column portions

109, 109 provided in a state where they are provided. The portions surrounded by the four sides by the

column portions

109 and 109 adjacent to each other in the circumferential direction and the

rim portions

108 and 108 serve as

pockets

110 and 110 for holding the rollers 106 in a rollable manner.

Such assembling of the cage and roller 100 includes a case where the cage and roller 100 is assembled to the shaft 104 and then assembled to the outer diameter side member 102, a case where the cage and roller 100 is assembled to the outer diameter side member 102, and a case where the cage and roller 100 is assembled to the shaft 104. There is. At this time, the roller 106 may be assembled into the cage after the cage 107 is first assembled to the shaft 104 or the outer diameter side member 102. However, in this case, an outward flange whose outer diameter is larger than the inner diameter of the cage 107 at the portion between the end of the shaft 104 and the inner ring raceway 105 in the axial direction on the outer peripheral surface of the shaft 104. If there is an obstacle such as a buttocks, the obstacle becomes an obstacle and the cage 107 cannot be moved in the axial direction to the periphery of the inner ring raceway 105. Similarly, in the inner peripheral surface of the outer diameter side member 102, the inner diameter dimension is larger than the outer diameter dimension of the cage 107 at a portion between the end of the outer diameter side member 102 and the outer ring raceway 103 in the axial direction. If there is an obstacle such as a small inward flange-shaped buttocks, the obstacle becomes an obstacle and the cage 107 cannot be moved in the axial direction to the periphery of the outer ring raceway 103.

As a cage capable of eliminating such inconvenience, Patent Document 1 describes a cage having a discontinuous portion at one place in the circumferential direction. FIG. 10 shows a cage and roller 120 using a cage 121 having the same basic structure as the cage described in Patent Document 1. The retainer 121 is provided with a discontinuity 122 that is a discontinuous portion at one place in the circumferential direction. Further, the center portions in the width direction on both sides in the circumferential direction sandwiching the cut 122 are engaged with each other so as to be relatively displaceable in the circumferential direction without rattling. In the case of the cage 121 having such a configuration, the inner diameter dimension can be elastically expanded based on increasing the width of the cut 122 in the circumferential direction. For this reason, the obstacle can be overcome by elastically expanding the inner diameter in this way.

Japanese National Utility Model Publication No. 01-077132

However, in the case of the cage 121 provided with the discontinuity 122 that is a discontinuous portion at one place in the circumferential direction as in the technique of Patent Document 1, the width of the discontinuity 122 becomes circular due to a handling mistake during assembly work. There is a possibility of excessive spreading in the circumferential direction. Thus, when the width of the cut 122 is excessively widened in the circumferential direction, the cage 121 is plastically deformed, and further, the openings of the

pockets

123 and 123 are deformed, and the rollers are held in the

pockets

123 and 123. There is a possibility that troubles such as dropping of 124 and 124 to the outside occur.

The present invention has been made in view of the circumstances as described above, and an object of the present invention is to provide a radial roller bearing retainer that can be reduced in diameter and expanded without causing plastic deformation, and a cage and roller. It is to provide.

The above object of the present invention is achieved by the following configurations.
(1) a pair of rim portions arranged coaxially with each other;
A plurality of column portions connecting the pair of rim portions in the axial direction;
With
Each of the pair of rim portions is constituted by a plurality of arc-shaped portions,
Between each end portion of the arc-shaped portion adjacent in the circumferential direction, a plurality of cuts are formed in the same phase in the circumferential direction in each rim portion,
A plurality of elastic deformation portions that contract or extend in the circumferential direction are provided in the circumferential direction between the column portions adjacent in the circumferential direction in which the cut is formed,
The elastically deforming portion has each end portion of the arc-shaped portion adjacent in the circumferential direction as a base end portion and extends inward in the axial direction from each end portion, and the extended portion is in the circumferential direction. Having a pair of elastically deforming pieces to be connected at
The pair of elastic deformation pieces have the same shape,
The radial roller bearing retainer is characterized in that the elastically deforming portion is formed symmetrically with respect to the axially intermediate portion.
(2) The radial roller bearing holding according to (1), wherein a circumferential distance of the cut is smaller than a sum of circumferential distances between the adjacent column portion and the elastic deformation piece. vessel.
(3) It consists of a cage and multiple rollers.
The cage includes a pair of rim portions arranged coaxially with each other, and a plurality of column portions that connect the pair of rim portions in the axial direction,
Each of the pair of rim portions is constituted by a plurality of arc-shaped portions,
Between each end portion of the arc-shaped portion adjacent in the circumferential direction, a plurality of cuts are formed in the same phase in the circumferential direction in each rim portion,
A plurality of elastic deformation portions that contract or extend in the circumferential direction are provided in the circumferential direction between the column portions adjacent in the circumferential direction in which the cut is formed,
The elastically deforming portion has each end portion of the arc-shaped portion adjacent in the circumferential direction as a base end portion and extends inward in the axial direction from each end portion, and the extended portion is in the circumferential direction. Having a pair of elastically deforming pieces to be connected at
The pair of elastic deformation pieces have the same shape,
The cage-and-roller, wherein the elastically deforming portion is formed symmetrically with respect to the axially intermediate portion.
(4) The cage-and-roller according to (3), wherein a circumferential distance between the cuts is smaller than a sum of circumferential distances between the adjacent column part and the elastic deformation piece.

According to the radial roller bearing retainer and the cage-and-roller of the present invention, a plurality of elastically deforming portions that are contracted or extended in the circumferential direction are provided in the circumferential direction, and the elastically deforming portions are provided in the intermediate portion in the axial direction. The cage is symmetrically formed so that plastic deformation is prevented, it has sufficient strength against axial twisting, and can be reduced in diameter and expanded in the circumferential direction while ensuring a sufficient amount of deformation. Can be provided.

Sectional drawing of the rotation support part incorporating the cage and roller which concerns on embodiment of this invention. The figure which looked at the circumference direction part of the cage of Drawing 1 from the diameter direction outside FIG. 2 is an axial sectional view of the cage and roller of FIG. 1. The principal part enlarged plan view of FIG. The principal part expansion perspective view of FIG. The principal part enlarged view of the diameter-retained cage. The principal part enlarged view of the expanded cage. Sectional drawing of the rotation support part incorporating the cage and roller of a prior art. The figure which looked at the circumferential direction part of the cage of the prior art from the radial direction outer side. Sectional drawing which abbreviate | omits one part shape and shows the cage and roller using the holder | retainer which has a discontinuous part in one place of the circumferential direction.

Hereinafter, a radial roller bearing retainer and a cage and roller according to each embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a cross-sectional view of a rotation support portion incorporating a cage and roller 10 according to an embodiment of the present invention. The cage and roller 10 includes a cage 13 and a plurality of rollers 12.

The plurality of rollers 12 are thin cylindrical members formed of, for example, high carbon chromium bearing steel, and thin rollers are also called needle rollers or needles.

The cage 13 is made of a resin, such as an aromatic polyamide (aromatic PA), polyamide 46, polyamide 6, polyamide 66, or other polyamide (nylon resin), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyacetal. (POM), fluorine resins such as polytetrafluoroethylene (PTFE), and the like can be used. Moreover, what mixed reinforcing agents, such as glass fiber and carbon fiber, with these resin can also be used conveniently. More preferably, polyamide resin is mixed with glass fiber or carbon fiber in an amount of 5 to 30% by mass, and the flexural modulus is 2000 to 5000 MPa. Within this range, the deformable portion can be more suitably deformed and have the necessary rigidity.

As shown in FIG. 2, the retainer 13 includes a pair of

rim portions

15 and 15 arranged coaxially with each other, and a plurality of column portions 16 that connect the pair of

rim portions

15 and 15 in the axial direction. The pair of

rim portions

15 and 15 are respectively configured by a plurality (four in this embodiment) of arc-shaped portions 15a. Between the

end portions

15b and 15b of the arc-shaped portion 15a adjacent to each other in the circumferential direction, a plurality of cuts 15c are formed in the

rim portions

15 and 15 with the same phase in the circumferential direction. As the number of cuts 15c increases, the number of rollers 12 decreases, so the number of cuts 15c is preferably 2-6.

And the elastic deformation part 17 which shrinks | retains the holder | retainer 13 (cut 15c) to the circumferential direction between the

pillar parts

16 and 16 adjacent to the holder 13 in the circumferential direction in which the cut 15c is formed is a circumferential direction. Are provided in plurality.

A rectangular space that is surrounded by four sides by the circumferential side surfaces of the

column parts

16 and 16 that are adjacent to each other in the circumferential direction without sandwiching the elastic deformation part 17 and the inner side surfaces of the pair of

rim parts

15 and 15 that face each other. The portions are

pockets

14 and 14, respectively. As shown in FIG. 3, on both sides in the circumferential direction of the

pillars

16 and 16, an inner diameter side locking projection 16a is provided at the inner end of the cage 13 in the diameter direction, and an outer end is also provided at the outer end. A radial side locking projection 16b is formed over the entire length of each of the

pillars

16 and 16, respectively.

In order to rollably incorporate the roller 12 into the cage 13, the roller 12 is inserted into each

pocket

14, 14 from the inner diameter side or the outer diameter side of the cage 13. At the time of this insertion work, the

column portions

16 and 16 partitioning both sides in the circumferential direction of the

pockets

14 and 14 and the inner diameter side locking projections 16a formed on the side surfaces of the

column portions

16 and 16, Each roller 12 is pushed into each of the

pockets

14 and 14 while elastically deforming the radial side locking projection 16b. Since the width Wp extending in the circumferential direction of each

pocket

14, 14 at the part removed from each locking

projection

16 a, 16 b is larger than the outer diameter φDk of each roller 12 (Wp> φDk), In the state where the rollers 12 are held, the rollers 12 can roll with a light force in the pockets 14. In addition, the distance Wi between the distal end edges of the pair of inner diameter

side locking projections

16a, 16a existing in the inner diameter side opening portions of the

pockets

14, 14 in a free state and the pair of outer surfaces existing in the outer diameter side opening portions. The distance Wo in the free state between the front end edges of the radial

side locking projections

16b, 16b is smaller than the outer diameter φDk of each roller 12 (φDk <Wi, φDk <Wo). Therefore, the rollers 12 held in the

pockets

14 and 14 do not inadvertently fall out of the

pockets

14 and 14.

Further, as shown in FIG. 1, the thickness T of the cage 13 is smaller than the outer diameter φDk of each roller 12 (T <φDk). Therefore, a part of each roller 12 protrudes from the outer peripheral surface and inner peripheral surface of the retainer 13 in a state where the rollers 12 are held in the

pockets

14 and 14. In the state in which the cage and roller 10 is incorporated in the rotation support portion of various mechanical devices, the outer diameter having a thickness of δo is provided between the inner peripheral surface of the outer diameter side member 2 and the outer peripheral surfaces of the

rim portions

15 and 15. A side annular gap is formed between the outer peripheral surface of the shaft 4 and the inner peripheral surface of each

rim portion

15, 15 with an inner diameter side annular gap having a thickness of δi over the entire circumference.

In the present embodiment, the inner diameter side locking projection 16a and the outer diameter side locking projection 16b are formed over the entire length of each of the

column portions

16 and 16, respectively, but only in a range narrower than the total length. It may be provided or may be divided into a plurality of parts.

As shown in FIG. 2, the elastically deformable portion 17 extends inward in the axial direction from each end portion 15b with the

end portions

15b and 15b of the arc-shaped

portions

15a and 15a adjacent in the circumferential direction as base end portions. It has a pair of

elastic deformation pieces

17a and 17a that extend and connect the extended portions in the circumferential direction. The pair of

elastic deformation pieces

17 a and 17 a have the same shape, and the elastic deformation portion 17 is formed symmetrically with respect to the axial intermediate portion C of the cage 13.

As shown in FIG. 4 in an enlarged manner, the elastic deformation piece 17a is composed of a plurality of arcs 17a1, 17a2, 17a3 each having a radius of curvature R1 to R3. However, the elastic deformation piece 17a may be configured by a single arc.

Further, the axial width w1 of each end portion 15b of the arcuate portion 15a serving as the base end portion of the elastic deformation portion 17 is equal to or greater than the axial width w2 of the arcuate portion 15a in consideration of the strength of the base end portion. Preferably there is. Further, it is preferable that the curvature of the arc surface formed on the inner side surface in the axial direction of the base end portion is large (the curvature radius r is small).

Further, as shown in FIG. 5, the radial thickness h of the elastic deformation piece 17a is set to be thicker than the width w3 of the elastic deformation piece 17a. Can be suppressed.

As shown in FIG. 6, the cage 13 having the outer diameter φD1 deforms the elastic deformation portion 17, thereby narrowing the circumferential distance L1 (see FIG. 2) of the cut 15c and reducing the diameter to the outer diameter φD2. Can do. Here, the relationship between the outer diameters φD1 and φD2 of the cage 13 and the total sum of the circumferential distances L1 of the plurality of cuts 15c is approximately expressed by the following equation.
π · φD1-L1 × (number of cuts) = π · φD2

The movable range, that is, the amount of deformation of the elastic deformation piece 17a can be arbitrarily set by the axial distance L3 between the pair of

elastic deformation pieces

17a and 17a and the circumferential distance L1 of the cut 15c. However, the circumferential distance L1 of the cut 15c before elastic deformation is such that the column 16 and the elastic deformation piece 17a before the elastic deformation do not contact each other before the cut 15c disappears. It is set smaller than the sum of the circumferential distances L2 and L2 (L1 <2 × L2).

Further, as shown in FIG. 7, the cage 13 can expand the diameter L1 of the cut 15c by expanding the circumferential distance L1 by deforming the elastic deformation portion 17. Here, when the diameter of the cage 13 is expanded, the spring force of the elastic deformation piece 17a becomes resistance, and therefore it is possible to prevent the diameter from being unintentionally excessively expanded due to a handling mistake during assembly work. .

As described above, according to the cage and roller 10 of the present embodiment, the cage 13 is provided with a plurality of elastic deformation portions 17 in the circumferential direction that are contracted or expanded in the circumferential direction. 17 is formed symmetrically with respect to the axial intermediate portion C, so that plastic deformation is prevented, it has sufficient strength against axial twisting, and a sufficient amount of deformation is secured. A cage 13 that can be reduced in diameter and expanded in the circumferential direction can be provided. Further, the elastic deformation portion 17 allows the roller 12 to move moderately and prevents fretting.

Further, the pair of

rim portions

15 and 15 are configured by a plurality of arc-shaped portions 15a, and the pair of

rim portions

15 and 15 includes a plurality of

rim portions

15 and 15 between a plurality of end portions 15b of the arc-shaped portions 15a adjacent in the circumferential direction. The cuts 15c are formed in the same phase in the circumferential direction, and the elastic deformation portions 17 extend inward in the axial direction from the respective end portions 15b of the adjacent arc-shaped portions 15a, and the extended portions are arranged in the circumferential direction. Has a pair of elastically

deformable pieces

17a, 17a connected to each other. Thereby, the elastic deformation part 17 symmetrical with respect to the axial direction intermediate part C can be formed.

Further, the elastic deformation portion 17 is formed between the

column portions

16 and 16 adjacent in the circumferential direction, and the circumferential distance L1 of the cut 15c is the circumferential direction between the adjacent column portion 16 and the elastic deformation piece 17a. Since the distance L2 is smaller than the sum of the distances L2, the column part 16 and the elastic deformation piece 17a do not contact each other before the cut 15c disappears when contracted in the circumferential direction, and a sufficient amount of deformation can be ensured. .

Note that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like can be made as appropriate.

This application is based on Japanese Patent Application No. 2012-267376 filed on Dec. 6, 2012, the contents of which are incorporated herein by reference.

As described above, according to the cage and the cage and roller of the present invention, a plurality of elastically deforming portions are provided in the circumferential direction to contract or extend the cage in the circumferential direction, and the elastically deforming portions are axially arranged. It is formed symmetrically with respect to the middle part. As a result, it is possible to provide a cage that is prevented from plastic deformation, has sufficient strength against axial twisting, and can be reduced in diameter and expanded in the circumferential direction while ensuring a sufficient amount of deformation. Therefore, it can be suitably used as a radial roller bearing retainer and cage and roller used in the rotation support portion of various mechanical devices.

DESCRIPTION OF SYMBOLS 10 Cage and roller 12 Roller 13 Cage 14 Pocket 15 Rim part 15a Arc-shaped part 15b End part 15c Cut 16 Column part 16a Inner diameter side locking protrusion 16b Outer diameter side locking protrusion 17 Elastic deformation part 17a Elastic deformation piece 100 Cage and roller 102 Outer diameter side member 103 Outer ring raceway 104 Shaft 105 Inner ring raceway 106 Roller 107 Cage 108 Rim part 109 Pillar part 110 Pocket 120 Cage and roller 121 Cage 122 Cut 123 Pocket 124 Roller

Claims

A pair of rim portions arranged coaxially with each other;
A plurality of column portions connecting the pair of rim portions in the axial direction;
With
Each of the pair of rim portions is constituted by a plurality of arc-shaped portions,
Between each end portion of the arc-shaped portion adjacent in the circumferential direction, a plurality of cuts are formed in the same phase in the circumferential direction in each rim portion,
A plurality of elastic deformation portions that contract or extend in the circumferential direction are provided in the circumferential direction between the column portions adjacent in the circumferential direction in which the cut is formed,
The elastically deforming portion has each end portion of the arc-shaped portion adjacent in the circumferential direction as a base end portion and extends inward in the axial direction from each end portion, and the extended portion is in the circumferential direction. Having a pair of elastically deforming pieces to be connected at
The pair of elastic deformation pieces have the same shape,
The radial roller bearing retainer is characterized in that the elastically deforming portion is formed symmetrically with respect to the axially intermediate portion.
The radial roller bearing retainer according to claim 1, wherein the circumferential distance of the cut is smaller than the sum of the circumferential distances between the adjacent column portion and the elastic deformation piece.
It consists of a cage and multiple rollers,
The cage includes a pair of rim portions arranged coaxially with each other, and a plurality of column portions that connect the pair of rim portions in the axial direction,
Each of the pair of rim portions is constituted by a plurality of arc-shaped portions,
Between each end portion of the arc-shaped portion adjacent in the circumferential direction, a plurality of cuts are formed in the same phase in the circumferential direction in each rim portion,
A plurality of elastic deformation portions that contract or extend in the circumferential direction are provided in the circumferential direction between the column portions adjacent in the circumferential direction in which the cut is formed,
The elastically deforming portion has each end portion of the arc-shaped portion adjacent in the circumferential direction as a base end portion and extends inward in the axial direction from each end portion, and the extended portion is in the circumferential direction. Having a pair of elastically deforming pieces to be connected at
The pair of elastic deformation pieces have the same shape,
The cage-and-roller, wherein the elastically deforming portion is formed symmetrically with respect to the axially intermediate portion.
The cage-and-roller according to claim 3, wherein the circumferential distance of the cut is smaller than the sum of the circumferential distances between the adjacent column portion and the elastic deformation piece.