JP2016029285A - Cage, and cage-and-roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cage for a radial roller bearing, which can be diametrically enlarged or reduced without undergoing plastic deformation, and to provide a cage-and-roller.SOLUTION: The cage for the radial roller bearing is provided in which: a plurality of elastic deformation parts are provided for circumferentially contracting or elongating the cage; each elastic deformation part has a pair of same-shape elastic deformation pieces each of which has proximal ends being ends of circular portions circumferentially adjacent to each other and extends from each of the ends to axial inside and circumferentially connects the extended portions; and the elastic deformation part is formed in symmetry with respect to the axial intermediate. The cage-and-roller is also provided.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a radial roller (including a 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 rolled while being held by a cage 107 between a cylindrical surface-like inner ring raceway 105 provided on an outer peripheral surface of a shaft 104 such as a shaft (or a support shaft or an inner ring). Freely provided.

  Of these, the cage 107 is entirely formed of a synthetic resin material such as glass fiber reinforced plastic into a cylindrical shape. Such a cage 107 includes a pair of rim portions 108 and 108 which are arranged concentrically with each other in the axial direction and are annular, and are hung between the rim portions 108 and 108. A plurality of pillars 109, 109 provided in a handed state are provided. Then, the portions surrounded by four sides by the column portions 109 and 109 adjacent to each other in the circumferential direction and the rim portions 108 and 108 are used as pockets 110 and 110 for holding the rollers 106 in a freely rolling manner. Yes.

Such an assembly of the cage and roller 100 may be performed when the cage and roller 100 is assembled to the shaft 104 and then assembled to the outer diameter side member 102, or after being assembled to the outer shape side member 102 and then assembled to the shaft 104. . 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, the outer diameter of the outer peripheral surface of the shaft 104 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. If there is an obstacle such as an outward flange-shaped flange, 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, the inner diameter of the inner peripheral surface of the outer diameter side member 102 is 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 an inward flange-shaped flange that is smaller than the size, this obstacle becomes an obstacle and the cage 107 cannot be moved in the axial direction to the periphery of the outer ring raceway 105.

  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 can be elastically expanded based on the width of the cut 122 being expanded in the circumferential direction. For this reason, the obstacle can be overcome by elastically expanding the inner diameter in this way.

Japanese Utility Model Publication No. 01-077132

  However, in the case of the cage 121 provided with a 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 is reduced due to a handling error 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 furthermore, the openings of the pockets 123 and 123 are deformed, and the rollers retained 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 pillars connecting the pair of rim parts in the axial direction;
Each of the pair of rim portions is constituted by a plurality of arc-shaped portions,
A plurality of cuts are formed in the same direction in the circumferential direction in each rim portion between the end portions of the arc-shaped portions adjacent in the circumferential direction,
A plurality of elastic deformation portions that contract or extend in the circumferential direction are provided between the column portions adjacent in the circumferential direction where the cut is formed, and the elastic deformation portions are adjacent in the circumferential direction. With each end portion of the arc-shaped portion as a base end portion, each of these end portions extends inward in the axial direction, and has a pair of elastic deformation pieces that connect the extended portions in the circumferential direction,
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) Consists of a cage and multiple rollers,
The cage includes a pair of rim portions arranged coaxially with each other;
A plurality of pillars connecting the pair of rim parts in the axial direction;
Each of the pair of rim portions is constituted by a plurality of arc-shaped portions,
A plurality of cuts are formed in the same direction in the circumferential direction in each rim portion between the end portions of the arc-shaped portions adjacent in the circumferential direction,
A plurality of elastic deformation portions that contract or extend in the circumferential direction are provided between the column portions adjacent in the circumferential direction where the cut is formed, and the elastic deformation portions are adjacent in the circumferential direction. With each end portion of the arc-shaped portion as a base end portion, each of these end portions extends inward in the axial direction, and has a pair of elastic deformation pieces that connect the extended portions in the circumferential direction,
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.

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, for example, thin cylindrical members formed of 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, the polyamide resin is mixed with glass fiber or carbon fiber in an amount of 5 to 30% by mass and the flexural modulus is set to 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, 15 arranged coaxially with each other, and a plurality of column portions 16 that couple the pair of rim portions 15, 15 in the axial direction. The pair of rim portions 15 and 15 are each configured by a plurality (four in this embodiment) of arc-shaped portions 15a, and a plurality of rim portions 15 and 15 are provided between the end portions 15b and 15b of the arc-shaped portions 15a adjacent in the circumferential direction. A cut 15c is formed in each rim portion 15, 15 in the circumferential direction with the same phase. In addition, since the number of the rollers 12 will decrease when the number of the cuts 15c increases, the number of the cuts 15c is preferably 2-6.

  The retainer 13 is provided with a plurality of elastic deformation portions 17 that contract in the circumferential direction between the column portions 16 and 16 adjacent in the circumferential direction in which the cut 15c is formed.

  A rectangular space surrounded by four sides by the circumferential side surfaces of the pillars 16 and 16 adjacent in the circumferential direction and the inner surfaces of the pair of rim parts 15 and 15 facing each other without sandwiching the elastic deformation part 17. 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 formed on the inner end of the retainer 13 in the diameter direction, and the outer end is also formed on the outer end. The outer-diameter side locking projection 16b is formed over the entire length of each of the column parts 16 and 16, respectively.

In order to rollably incorporate the roller 12 into the cage 13, the roller 12 is inserted into the pockets 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, The rollers 12 are pushed into the pockets 14 and 14 while elastically deforming the radial side locking projections 16b. The width Wp of each of the pockets 14 and 14 in the circumferential direction at the portion removed from the locking projections 16a and 16b is the outer diameter φDk of the rollers 12.
(Wp> φDk), the rollers 12 can roll with a small force in the pockets 14 while the rollers 12 are held in the pockets 14. In addition, the interval Wi between the tip edges of the pair of inner diameter side locking projections 16a, 16a existing in the inner diameter side opening of each of the pockets 14, 14 in the free state, and 1 existing in the outer diameter side opening. The distance Wo in the free state between the tip edges of the pair of outer diameter side locking projections 16b, 16b is the outer diameter φDk of each roller 12 respectively.
(ΦDk <Wi, φDk <Wo). Therefore, the rollers 12 held in the pockets 14 and 14 are not inadvertently dropped from the pockets 14 and 14.

  Further, the thickness T of the cage 13 is smaller than the outer diameter φDk of each roller 12 (T <φDk). Therefore, in a state where these rollers 12 are held in the pockets 14, 14, a part of the rollers 12 protrudes from the outer peripheral surface and the inner peripheral surface of the cage 13. In a state where the cage and roller 10 is incorporated in the rotation support portion of various mechanical devices, an outer 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. Similarly, an inner diameter side annular gap having a thickness of δi is formed between the outer peripheral surface of the shaft 4 and the inner peripheral surface of each of the rim portions 15, 15.

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

  The elastically deformable portion 17 extends inward in the axial direction from each of the end portions 15b with the end portions 15b, 15b of the arc-shaped portions 15a, 15a adjacent in the circumferential direction as base end portions. It has a pair of elastic deformation pieces 17a and 17a which connect the done part in the circumference direction. The pair of elastic deformation pieces 17a and 17a have the same shape, and the elastic deformation portion 17 is formed symmetrically with respect to the central portion C in the axial direction.

  As shown in an enlarged view in FIG. 4, the elastic deformation piece 17a is composed of a plurality of arcs 17a1, 17a2, and 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 retainer 13 having the outer diameter φD1 can reduce the diameter to the outer diameter φD2 by narrowing the circumferential distance L1 of the cut 15c by deforming the elastic deformation portion 17. Here, the relationship between the diameter of the cage 15 and the total sum of the circumferential distances L1 of the cuts 15c is approximately expressed by the following equation.
π · φD1-L1 × (number of cuts) = π · φD2

  The movable range, that is, the deformation amount of the elastic deformation piece 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, L2.

  Moreover, as shown in FIG. 7, the retainer 13 can expand the diameter L1 of the cut 15c in the circumferential direction by deforming the elastic deformation portion 17, thereby expanding the diameter. Here, when the diameter of the cage 13 is expanded, the spring force of the elastic deformable piece 17a becomes resistance, so that it is possible to prevent the diameter from being inadvertently excessively expanded due to a handling mistake during assembly work. .

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

  In addition, the pair of rim portions 15, 15 is configured by a plurality of arc-shaped portions 15 a, and the pair of rim portions 15, 15 includes a plurality of cuts between end portions of the arc-shaped portions 15 a adjacent in the circumferential direction. 15c are formed in the same direction in the circumferential direction, and the elastic deformation portion 17 extends inward in the axial direction from each end portion 15b of the adjacent arc-shaped portion 15a, and the extended portion is extended in the circumferential direction. It has a pair of elastic deformation pieces 17a, 17a to be connected. 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. .

  In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

  As described above, according to the cage and the cage and roller of the present invention, a plurality of elastically deforming portions that are contracted or expanded 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. Therefore, it can be suitably used as a radial roller bearing retainer and a 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 (2)

A pair of rim portions arranged coaxially with each other;
A plurality of pillars connecting the pair of rim parts in the axial direction;
Each of the pair of rim portions is constituted by a plurality of arc-shaped portions,
A plurality of cuts are formed in the same direction in the circumferential direction in each rim portion between the end portions of the arc-shaped portions adjacent in the circumferential direction,
A plurality of elastic deformation portions that contract or extend in the circumferential direction are provided between the column portions adjacent in the circumferential direction in which the cut is formed, and the elastic deformation portions are adjacent in the circumferential direction. With each end portion of the arc-shaped portion as a base end portion, each of these end portions extends inward in the axial direction, and has a pair of elastic deformation pieces that connect the extended portions in the circumferential direction,
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. It consists of a cage and multiple rollers,
The cage includes a pair of rim portions arranged coaxially with each other;
A plurality of pillars connecting the pair of rim parts in the axial direction;
Each of the pair of rim portions is constituted by a plurality of arc-shaped portions,
A plurality of cuts are formed in the same direction in the circumferential direction in each rim portion between the end portions of the arc-shaped portions adjacent in the circumferential direction,
A plurality of elastic deformation portions that contract or extend in the circumferential direction are provided between the column portions adjacent in the circumferential direction in which the cut is formed, and the elastic deformation portions are adjacent in the circumferential direction. With each end portion of the arc-shaped portion as a base end portion, each of these end portions extends inward in the axial direction, and has a pair of elastic deformation pieces that connect the extended portions in the circumferential direction,
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.

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