JP2013060954A - Single-joint cage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a single-joint cage which is excellent in handling performance and assembly workability and is capable of stably continuing to retain a plurality of rolling elements over a long period of time by vanishing strength discrepancy of mutual joint regions and by maintaining strength of a whole retainer along circumferential direction equally and simultaneously by maintaining dimensional precision of the mutual joint regions at molding constantly and is capable of intending to enhance loading capacity and to make cost required to assemble lower.SOLUTION: A joint section 10 jointing one portion of circumferential direction is formed on regions (joint regions 10a, 10b) extending between mutual pockets 2p adjoining each other along circumferential direction and is provided with engagement parts capable of engaging with each other on one side joint surface Sa and other side joint surface Sb which are formed by jointing the regions in central position of the circumferential direction between the mutual pockets and predetermined gaps are formed between the one side joint surface and the other side joint surface and between the mutual engagement parts in such a state that both of the engagement parts are engaged to each other.

Description

  The present invention relates to a one-piece split cage in which one circumferential portion is divided in a ring-shaped cage.

  Conventionally, for example, needle roller bearings (needle bearings) are known as bearings capable of improving load capacity by incorporating many rolling elements (rollers) while achieving compactness. The needle roller bearing is provided with a countermeasure for preventing fretting during rotation of the bearing. As an example of the countermeasure, a one-piece cage may be applied (see, for example, Patent Documents 1 and 2). ).

  For example, the one split cage 2 shown in FIG. 18 includes a pair of annular portions 4 and 6 arranged in an annular shape and facing each other, and continuously between the annular portions 4 and 6. And a plurality of column portions 8 that extend and are arranged at a predetermined interval (for example, at equal intervals) along the circumferential direction. In this case, a plurality of spaces are provided at predetermined intervals (for example, equal intervals) along the circumferential direction in a portion surrounded by each column portion 8 adjacent to the circumferential direction and the pair of annular portions 4 and 6. An area is formed, and the plurality of space areas are configured as a plurality of pockets 2p that hold the rolling elements (rollers) rotatably one by one. Thereby, a plurality of rolling elements (rollers) are held in the one split cage 2 at a predetermined interval (for example, equal intervals) along the circumferential direction.

  Here, in the one-piece cage 2, the rolling elements (rollers) held in the pockets 2 p are configured as elongated rollers having a small diameter and a length of 3 to 10 times the diameter. The split cage 2 is incorporated, for example, between the inner and outer rings while rotatably holding the rolling elements (rollers) one by one in each pocket 2p. (Roll) and revolve along the inner and outer rings. In addition, the whole split cage 2 is molded (for example, injection molded) with a resin (for example, a thermoplastic resin).

  Further, the split cage 2 is provided with a dividing portion 10 that divides one place in the circumferential direction along a direction transverse (orthogonal) to the circumferential direction. The dividing portion 10 is formed in a region (hereinafter referred to as a divided region 10a, 10b) extending between the pockets 2p adjacent to each other along the circumferential direction, and the divided region 10a, 10b is divided into two. The one-side divided surface Sa and the other-side divided surface Sb, which are configured as described above, are arranged to face each other along the circumferential direction. In this case, the pair of annular portions 4 and 6 extend in an annular shape from the one-side divided region 10a in which the one-side divided surface Sa is configured, and the other-side divided in which the other-side divided surface Sb is configured. It continues to the region 10b.

  Further, the one-side divided surface Sa is provided with a rectangular convex portion 12 that protrudes (extends) a part of the central portion thereof toward the other-side divided surface Sb. The other side dividing surface Sb is provided with a concave portion 14 into which the convex portion 12 can be engaged by engaging a part thereof into a rectangular shape. Thereby, for example, when the single split cage 2 is assembled between the inner and outer rings, the split surfaces Sa and Sb are displaced from each other (specifically, the one split holder that revolves between the inner and outer rings when the bearing rotates). The displacement of the container 2 in the direction along the rotation axis Z) is prevented.

  Further, in the one-piece cage described in Patent Document 2, a convex portion is provided on one divided surface of the divided surface of the cage, and a concave portion is provided on the other divided surface. There is disclosed one in which each end face is formed in a tapered shape so as not to be present.

JP 2008-261407 A Japanese Utility Model Publication No. 63-125221

  By the way, in the conventional one-piece split cage 2 described above, the thickness W1 of the one-side divided region 10a (specifically, the thickness W1 along the circumferential direction) is equal to the thickness W2 of the other-side divided region 10b ( Specifically, it is set smaller than the wall thickness W2) along the circumferential direction. In other words, the one side divided area 10a is set to be thinner than the other side divided area 10b, that is, the other side divided area 10b is set to be thicker than the one side divided area 10a.

  Here, focusing on the strength (rigidity) of the one-side divided region 10a and the other-side divided region 10b, the strength (rigidity) in the thin one-side divided region 10a is the strength (rigidity) in the thick-walled other-side divided region 10b. It is lower than In this case, two divided regions 10a and 10b having different thicknesses are formed in the divided portion 10 of the one-piece cage 2, thereby causing a difference in strength (rigidity) between the divided regions 10a and 10b. It becomes.

  Then, depending on the degree of the strength (rigidity) difference, it becomes difficult to maintain (secure) the entire strength (rigidity) of the entire split cage 2 along the circumferential direction. When a plurality of rolling elements (rollers) are held in the crack retainer 2, for example, the one-side divided region 10 a is deteriorated at an early stage due to an external force applied to a portion having low strength (rigidity), and each rolling element It becomes difficult to keep the (roller) stably over a long period of time, and as a result, the one-piece cage 2 may be deteriorated early.

  Further, when attention is paid to the thicknesses W1 and W2 of the one-side divided region 10a and the other-side divided region 10b, when the one-piece split cage 2 made of resin is injection-molded, the thin one-side divided region 10a and the thickness are reduced. Cooling unevenness (shrinkage) is likely to occur in the other side divided region 10b. Here, when the cooling unevenness (shrinkage nest) occurs in the two divided regions 10a and 10b, the dimensional accuracy between the one-side divided surface Sa and the other-side divided surface Sb is kept constant in the divided portion 10. This makes it difficult to arrange the divided surfaces Sa and Sb so as to face each other accurately.

  Then, depending on the degree of the cold unevenness (shrinking nest), it becomes difficult to maintain the one-break cage 2 in a preset contour shape (posture), and in this state, the one-break cage 2 has a plurality of When the rolling elements (rollers) are held, for example, it becomes difficult to stably hold a plurality of rolling elements (rollers) incorporated between the inner and outer rings over a long period of time. There is a risk that the crack retainer 2 will deteriorate early.

  Further, when attention is paid to the arrangement configuration of the one-side divided surface Sa and the other-side divided surface Sb that divides (divides) the divided regions 10a and 10b into two in the divided portion 10, the divided portion 10 (one-side and other-side divided surface Sa) is concerned. , Sb) is relatively deviated from the circumferential center position between the pockets 2p on both sides in the circumferential direction (specifically, the position in which the circumferential length between the pockets 2p on both sides in the circumferential direction is divided into two). It is provided at a (shifted) position.

  In other words, the divided portion 10 (one-side and other-side divided surfaces Sa, Sb) is provided at a position deviated (shifted) from a portion that coincides with the interval pitch along the circumferential direction of the plurality of pockets 2p. . From another perspective, the phase between the arrangement position of the divided portion 10 (one-side and other-side divided surfaces Sa, Sb) and the circumferential center position between the pockets 2p on both sides in the circumferential direction is along the circumferential direction. Are relatively displaced.

  In this case, for example, when the one split cage 2 is assembled at a predetermined location by an automatic assembling machine, it is necessary to set the assembling direction in advance. In this case, the assembly process takes time and effort, and the handling and assembling performance are lowered. Therefore, there is a certain limit to the cost reduction required for the assembly. In addition, when it incorporates ignoring an assembly direction, there is a possibility that the one-piece cage 2 itself may be damaged by the positioning pins used in the assembly process.

  Further, in the divided portion 10, the thickness of both the one-side divided region 10a where the one-side divided surface Sa is configured and the other-side divided region 10b where the other-side divided surface Sb is configured are the same thickness. For example, the thickness W1 of the one-side divided region 10a may be increased (enlarged) to the same extent as the thickness W2 of the other-side divided region 10b so that (W1 = W2). However, if this is done, the number of pockets 2p must be reduced accordingly. As a result, the number of rolling elements (rollers) incorporated decreases, and as a result, it becomes impossible to maintain and improve the load capacity of the one-break cage 2.

  Furthermore, in the one-piece cage of Patent Document 2, the tapered end surfaces of the concave portion and the convex portion have a component force in the axial direction with respect to a minute movement of the cage during operation (movement to prevent fretting). Since the sliding occurs, the cage may be worn or damaged.

  The present invention has been made to solve such a problem, and its purpose is to eliminate the difference in strength (rigidity) between the divided regions and to maintain the strength (rigidity) of the entire cage evenly in the circumferential direction. In addition, by maintaining a constant dimensional accuracy between the divided areas at the time of molding, it is possible to stably hold a plurality of rolling elements over a long period of time, which is required for improving load capacity and assembling. It is an object of the present invention to provide a one-piece cage that can be reduced in cost and excellent in handling and assembling.

In order to achieve such an object, the present invention is achieved by the following configurations.
(1) A plurality of annular portions that are arranged opposite each other in an annular shape, and a plurality of annular portions that extend continuously between the annular portions and that are arranged at predetermined intervals along the circumferential direction. A one-piece cage having a pillar part, a plurality of pockets formed at a predetermined interval along a circumferential direction, formed in a portion surrounded by a pair of annular parts and a plurality of pillar parts. The split cage is provided with a dividing portion that divides one circumferential direction along a direction crossing the circumferential direction, and the divided portions are adjacent to each other along the circumferential direction. The one side split surface and the other side split surface formed by dividing the region are formed in a region extending in between, and formed by dividing the region in the circumferential center position between these pockets. Arranged on the one side dividing surface and the other side dividing surface, respectively. Engageable engaging parts are provided, these engaging parts are arranged facing each other in the circumferential direction, and the engaging parts of both the one-side divided surface and the other-side divided surface are engaged with each other , A predetermined gap is formed between the one-side divided surface and the other-side divided surface and between the engaging portions.

(2) In the above (1), a plurality of one-side convex portions that protrude toward the other-side divided surface and concave portions between the one-side convex portions are recessed on the one-side divided surface as engaging portions. A concave portion on one side is provided, and a plurality of other concave portions that can be engaged with a plurality of convex portions on the other side as engaging portions on the other side split surface, and one side between the concave portions on the other side. In the state where the other side convex portion that protrudes toward the dividing surface and can be engaged with the one side concave portion is provided, and the engaging portions of both the one side dividing surface and the other side dividing surface are engaged with each other. A predetermined gap is formed between the one-side convex portion and the other-side concave portion, and between the one-side concave portion and the other-side convex portion, and the engagement in the direction along the circumferential direction in the gap. The gap between the joints is between the one side split surface and the other side split surface in the direction along the circumferential direction. It is set smaller than the gap.

(3) In the above (2), in a state where the engaging portions of both the one-side divided surface and the other-side divided surface are engaged with each other, the one-side divided surface and the other-side divided surface in the direction along the circumferential direction The gap between the engagement portions in the direction along the circumferential direction is a gap formed between the one side split surface and the other side split surface, and the one side convex portion and the other side concave portion. Is set so as to satisfy the relationship of A> B = C, where B is the gap formed between and B, and C is the gap formed between the one-side concave portion and the other-side convex portion.
(4) In the above (2) or (3), the gap between the engaging portions in the direction orthogonal to the circumferential direction in a state where both engaging portions of the one-side divided surface and the other-side divided surface are engaged with each other Satisfies the relationship D> E, where D is a gap formed between the one side convex portion and the other side concave portion, and E is a gap formed between the one side concave portion and the other side convex portion. Is set to
(5) In any one of the above (2) to (4), the one-side divided surface is formed with a diameter-enlarging restriction recess on the axially outer side of the plurality of one-side protrusions, and the other-side divided surface is On the axially outer side of the plurality of other-side recesses, diameter-enlargement restriction convex portions that can be engaged with the diameter-enlargement restriction recesses are formed, and the axial side surfaces of the diameter-enlargement restriction recesses and the diameter-enlargement restriction protrusions that face each other Are formed in a tapered shape so as to come into contact with each other when the divided portions expand in the circumferential direction.
(6) In the above (5), the gap in the direction orthogonal to the circumferential direction formed between the diameter expansion restricting recess and the diameter expansion restricting protrusion is between the one side recess and the other side protrusion. It is larger than the gap in the direction orthogonal to the circumferential direction.
(7) A plurality of annular portions that are arranged to face each other in an annular shape, and a plurality of annular portions that extend continuously between the annular portions and are arranged at predetermined intervals along the circumferential direction. A one-piece cage having a pillar part, a plurality of pockets formed at a predetermined interval along a circumferential direction, formed in a portion surrounded by a pair of annular parts and a plurality of pillar parts. The one split cage is provided with a dividing portion that divides one circumferential direction along a direction crossing the circumferential direction, and the pair of annular portions are arranged around the dividing portion. The thickness in the radial direction of the starting point portion shifted in phase by 180 ° with respect to the direction is formed thinner than the thickness in the radial direction in the vicinity of the divided portion.
(8) In the above (7), the pair of annular portions includes a thin portion and a thick portion having different thicknesses in the radial direction, and the thin portion is located at the starting portion, and the thick portion is located near the divided portion. The boundary between the thin portion and the thick portion is located on the pocket.
(9) In the above (7), the pair of annular portions includes a thin portion and a thick portion having different thicknesses in the radial direction, and the thin portion is located at the starting portion, and the thick portion is located in the vicinity of the divided portion. The boundary between the thin wall portion and the thick wall portion is located on the column portion.

  According to the present invention, the difference in strength (rigidity) between the divided regions is eliminated, the strength (rigidity) of the entire cage is maintained uniformly along the circumferential direction, and the dimensional accuracy between the divided regions during molding is kept constant. By maintaining it, it is possible to keep a plurality of rolling elements stably over a long period of time, and it is possible to improve the load capacity and reduce the cost required for assembling. It is possible to realize an excellent one-piece cage.

(a) is a perspective view which shows roughly the whole structure of the one split holder | retainer based on 1st Embodiment of this invention, (b) is a periphery structure around the division | segmentation part shown by the same figure (a) The top view which expands and shows, (c) is a top view which expands and shows the dimensional relationship of the clearance gap in the division | segmentation part shown by the same figure (a). Sectional drawing which follows the XX line | wire of FIG.1 (b) in the one split holder | retainer shown by Fig.1 (a). It is a figure which expands and partially shows the structure of the one split cage which concerns on the 1st modification of 1st Embodiment of this invention, (a) is along the YY line of FIG.1 (b). Sectional drawing, (b) is a sectional view showing another configuration example of the configuration shown in FIG. The top view which expands and shows partially the external appearance structure of the 1-break cage which concerns on the 2nd modification of 1st Embodiment of this invention. The top view which partially expands and shows the external appearance structure of the one crack holder which concerns on the 3rd modification of 1st Embodiment of this invention. (a) is a top view which expands and partially shows the external appearance structure of the 1-piece cage based on the 4th modification of 1st Embodiment of this invention, (b) is b of the same figure (a). Sectional drawing along line -b, (c) is a sectional view along line cc in FIG. (A) is a top view which partially enlarges and shows the external appearance structure of the one split cage which concerns on the 5th modification of 1st Embodiment of this invention, (b) is shown to the figure (a). The top view which expands and shows the dimensional relationship of the clearance gap in the performed division part. The top view which expands and shows partially the external appearance structure of the 1-break cage which concerns on the 6th modification of 1st Embodiment of this invention. The top view which expands and partially shows the external appearance structure of the 1-break cage which concerns on the 7th modification of 1st Embodiment of this invention. The top view which expands and shows partially the external appearance structure of the one crack holder which concerns on the 8th modification of 1st Embodiment of this invention. The top view which expands and shows partially the external appearance structure of the 1-break cage which concerns on the 9th modification of 1st Embodiment of this invention. The top view which expands and shows partially the external appearance structure of the 1-break cage which concerns on the 10th modification of 1st Embodiment of this invention. The perspective view which shows the whole structure of the radial roller bearing cage (one split cage) which concerns on 2nd Embodiment of this invention. The perspective view which shows the whole structure of the radial roller bearing cage (one split cage) which concerns on 3rd Embodiment of this invention. The perspective view which shows the whole structure of the radial roller bearing cage (one split cage) which concerns on 4th Embodiment of this invention. The perspective view which shows the whole structure of the radial roller bearing cage (one split cage) which concerns on 5th Embodiment of this invention. The perspective view which shows the whole structure of the radial roller bearing cage (one split cage) which concerns on 6th Embodiment of this invention. The perspective view which shows roughly the whole structure of the conventional one crack holder | retainer.

Hereinafter, a one-piece cage according to a first embodiment of the present invention will be described with reference to the accompanying drawings.
In addition, since this embodiment is an improvement of the one-crack retainer 2 shown in FIG. 15, only the improved part will be described below. In this case, with respect to the same configuration as the above-described one-break cage 2 (FIG. 15), the same reference numerals as those used for the configuration are attached to the drawings used in the present embodiment to explain the same. Is omitted.

  As shown in FIG. 1 and FIG. 2, in the one-piece cage 2 of the present embodiment, a dividing unit 10 that divides one place in the circumferential direction along a direction crossing (orthogonal) the circumferential direction. Is provided. The divided portion 10 is formed in a region extending between the pockets 2p adjacent to each other along the circumferential direction (that is, the divided regions 10a and 10b), and at the central position in the circumferential direction between the pockets 2p, the divided region 10a is formed. , 10b is divided into two, the one-side divided surface Sa and the other-side divided surface Sb are arranged facing each other in the circumferential direction.

Here, the center position in the circumferential direction between the pockets 2p in which the dividing portions 10 (one side and the other side dividing surfaces Sa and Sb) are arranged will be described.
The circumferential center position is preferably set to a position where the circumferential length between the pockets 2p on both sides in the circumferential direction of the dividing portion 10 (one-side and other-side divided surfaces Sa, Sb) is divided into two. In other words, in a state where the rolling elements (rollers) 16 are held in the pockets 2p adjacent to the dividing portion 10 in the circumferential direction (FIG. 1 (b) and FIG. 2), the rolling elements are rotated from the rotation axis Z of the cage 2. It is preferable to set the circumferential center position of the dividing portion 10 so that the line connecting the rotation centers 16r of the (roller) 16 forms an equal angle θα along the circumferential direction.

  Further, in the one-piece cage 2 in which the rolling elements (rollers) 16 are held in the pockets 2p (FIGS. 1B and 2), each rolling element (roller) is rotated from the rotation axis Z of the cage 2. ) It is preferable that the line segments connecting the 16 rotation centers 16r form an equal angle θ along the circumferential direction. In this case, θα = θ may be set, or θα ≠ θ may be set.

  In any case, in the region (divided regions 10a and 10b) extending between the pockets 2p (rolling elements (rollers) 16) on both sides in the circumferential direction of the divided part 10, one side on which the one-side divided surface Sa is configured. The thickness W1 of the divided region 10a (specifically, the thickness W1 along the circumferential direction) and the thickness W2 of the other divided region 10b in which the other divided surface Sb is configured (specifically, the circumferential direction) Are set to the same thickness (W1 = W2) (FIG. 1B).

  Further, in the one-piece cage 2 in which the thicknesses of the divided regions 10a and 10b are set to be the same (W1 = W2), the divided portion 10 (one-side divided surface Sa and other-side divided surface Sb) Engaging portions that can be engaged with each other are provided, and these engaging portions are arranged to face each other in the circumferential direction. And in a state where both engaging portions of the one-side divided surface Sa and the other-side divided surface Sb are engaged with each other, between the one-side divided surface Sa and the other-side divided surface Sb and between the engaging portions. A predetermined gap is formed.

  More specifically, the one-side divided surface Sa has a plurality of (two as an example in the drawing) one-side convex portions 18 projecting toward the other-side divided surface Sb as engaging portions, There is provided a one-side recess 20 that is recessed between the side protrusions 18. On the other hand, a plurality of (as an example, two in FIG. 2) other side recesses 22 that can be engaged with a part of the plurality of one side projections 18 entering the other side dividing surface Sb. The other-side convex portion 24 is provided so as to protrude between the other-side concave portions 22 toward the one-side divided surface Sa and to be partly engaged with the one-side concave portion 20 and engageable therewith.

  That is, in this embodiment, the axial inner side surface 18s of the one-side convex portion 18 constitutes the axial side surface 20s of the one-side concave portion 20, and the axial inner side surface 22s of the other-side concave portion 22 is the axis of the other convex portion 24. The direction side surface 24s is constituted and formed along the circumferential direction in parallel with each other.

  In addition, about the shape of the convex parts 18 and 24 and the recessed parts 20 and 22, although rectangular shape was shown as an example in drawing, it is not limited to this. In short, for example, when the split cage 2 is assembled between the inner and outer rings, the split surfaces Sa and Sb are displaced from each other (specifically, the split cage 2 that revolves along the inner and outer rings when the bearing rotates). As long as the shape can prevent a shift in the direction along the rotation axis Z, for example, a triangular shape, an arc shape, or the like can be arbitrarily set. Further, the size and the number of the convex portions 18 and 24 and the concave portions 20 and 22 are set according to the size of the divided regions 10a and 10b, the purpose of use of the split cage 2 and the usage environment, for example. There is no particular limitation here.

  Here, in a state where the engaging portions of both the one-side divided surface Sa and the other-side divided surface Sb are engaged with each other, between the one-side convex portion 18 and the other-side concave portion 22 and between the one-side concave portion 20 and the other side. Predetermined gaps are respectively formed between the side convex portions 24. In this case, in the gap, the gap between the engaging portions in the direction along the circumferential direction is set smaller than the gap between the one-side divided surface Sa and the other-side divided surface Sb in the direction along the circumferential direction. Has been.

Specifically, in a state where both engaging portions are engaged with each other, the gap between the one-side divided surface Sa and the other-side divided surface Sb in the direction along the circumferential direction and the engagement in the direction along the circumferential direction The gap between the parts is
A gap formed between the one-side divided surface Sa and the other-side divided surface Sb is A,
A gap formed between the one side convex portion 18 and the other side concave portion 22 is B,
When the gap formed between the one side concave portion 20 and the other side convex portion 24 is C,
A> B = C
It is preferable to set so as to satisfy the following relationship (FIG. 1C).

  Note that the gap B and the gap C are not necessarily set to be the same (B = C). For example, the size of the divided areas 10a and 10b, the purpose of use and the usage environment of the split cage 2 Accordingly, the gap B can be made larger than the gap C (B> C), or conversely, the gap B can be made smaller than the gap C (B <C). However, in any case, the gap B and the gap C are preferably set smaller than the gap A.

In addition, regarding the gap between the engaging portions, it is preferable to consider not only the direction along the circumferential direction described above but also the direction orthogonal to the circumferential direction.
That is, in the state where the engaging portions of both the one-side divided surface Sa and the other-side divided surface Sb are engaged with each other, the gap between the engaging portions in the direction orthogonal to the circumferential direction is
A gap formed between the one side convex portion 18 and the other side concave portion 22 is D,
If the gap formed between the one side concave portion 20 and the other side convex portion 24 is E,
D> E
It is preferable to set so as to satisfy the following relationship (FIG. 1C).

  The positional relationship between the gap D and the gap E will be described. The gap D is, for example, the one-side convex portion 18 and the other side on the outside of the two one-side convex portions 18 (that is, close to the annular portions 4 and 6). It can be defined as a gap formed between the recess 22. On the other hand, the gap E may be defined as a gap formed between the one-side concave portion 20 and the other-side convex portion 24 on the outer side of the one-side concave portion 20 (that is, close to the annular portions 4 and 6). it can.

  As described above, according to the present embodiment, by setting the dividing portion 10 at the center position in the circumferential direction between the pockets 2p, the thickness W1 of the one-side divided region 10a in which the one-side divided surface Sa is configured, and the other side The thickness W2 of the other divided region 10b where the dividing surface Sb is configured can be set to the same thickness (W1 = W2).

  In this case, paying attention to the strength (rigidity) of the one-side divided region 10a and the other-side divided region 10b, by making the thicknesses of the divided regions 10a and 10b the same (W1 = W2), one side of the thickness W1 The strength (rigidity) in the divided region 10a and the strength (rigidity) in the other-side divided region 10b of the thickness W2 can be made the same (equal). That is, the strength (rigidity) difference between the divided regions 10a and 10b can be eliminated.

  According to this, the intensity | strength (rigidity) of the whole split cage 2 can be maintained (secured) uniformly along the circumferential direction. For this reason, for example, in a state where a plurality of rolling elements (rollers) are held in the single cage 2, even if an external force is applied during the rotation of the bearing, the external force is equally applied over the entire cage 2. Therefore, it is possible to maintain and improve the durability (fretting resistance) of the one-crack cage 2 and, as a result, to keep each rolling element (roller) stably over a long period of time. Can do.

  When attention is paid to the thicknesses W1 and W2 of the one-side divided region 10a and the other-side divided region 10b, when the one-piece split cage 2 is injection-molded, both the divided regions 10a and 10b are cooled unevenly. There is no such thing as a shrinkage nest. In this case, in the divided portion 10 after molding, the dimensional accuracy between the one-side divided surface Sa and the other-side divided surface Sb can be kept constant, and as a result, the divided surfaces Sa and Sb can be accurately set to each other. It can be arranged and configured to face the surface.

  According to this, the one-piece cage 2 can be maintained in a preset contour shape (posture). For this reason, for example, since a plurality of rolling elements (rollers) can be stably held with respect to the one split cage 2, the bearing can be stably rotated over a long period of time.

  Further, when attention is paid to the arrangement configuration of the one-side divided surface Sa and the other-side divided surface Sb that divides (divides) the divided regions 10a and 10b into two in the divided portion 10, the divided portion 10 (one-side and other-side divided surface Sa) is concerned. , Sb) can be provided at the circumferential center position between the pockets 2p on both sides in the circumferential direction (specifically, the circumferential length between the pockets 2p on both sides in the circumferential direction is divided into two).

  In this case, for example, when the one-piece cage 2 is assembled at a predetermined location by an automatic assembling machine, a process for setting the assembling direction in advance becomes unnecessary. According to this, since the efficiency of the assembly process can be improved, the handleability and the assemblability can be greatly improved. For this reason, the cost required for assembly can be greatly reduced.

  Further, according to the present embodiment, only the engaging portion of the dividing portion 10 can sufficiently cope with the prevention of deviation between the divided surfaces Sa and Sb when the one-piece cage 2 is assembled between the inner and outer rings. it can. In this case, the gap A configured between the one-side divided surface Sa and the other-side divided surface Sb can be arbitrarily set. According to this, for example, the gap A can be set to a size in which the positioning pin 26 (FIG. 1B) used in the assembly process can be inserted. Generation | occurrence | production of the malfunction that the split cage 2 itself will be damaged can be eliminated.

  Further, according to the present embodiment, the dividing portion 10 (one side and the other side dividing surfaces Sa and Sb) is arranged at the circumferential center position between the pockets 2p on both sides in the circumferential direction (between the pockets 2p on both sides in the circumferential direction). The circumferential length can be provided at a position divided into two). In this case, since it is not necessary to increase the divided regions 10a and 10b between the pockets 2p, the above-described engaging portion can be configured without reducing the number of pockets 2p. According to this, it becomes possible to maintain the present number of rolling elements (rollers) or to improve it, and as a result, it is possible to improve and maintain the load capacity of the one-break cage 2.

In addition, this invention is not limited to above-described embodiment, The technical thought which concerns on each following modification is also contained in the technical scope of this invention.
As a first modified example, a step is formed along the radial direction (a direction perpendicular to the rotation axis Z of the one split cage 2 that revolves between the inner and outer rings when the bearing rotates) in the engaging portion of the dividing portion 10. You may make it give. As an example, FIG. 3A shows a configuration in which a step in the radial direction is provided on the one-side concave portion 20 and the other-side convex portion 24 in the engaging portion.

  Here, as the radial step, the one-side concave portion 20 is formed with a protruding portion 20a in which a part (in the drawing, as an example, the inner diameter side) protrudes toward the other-side convex portion 24. The side convex portion 24 is formed with a concave portion 24a into which the protruding portion 20a partially enters and can be engaged with a part of the other convex portion 24 (in the drawing, as an example, the inner diameter side). .

In addition, since the shape and magnitude | size of the protrusion part 20a and the hollow part 24a are set according to the shape and magnitude | size of the one side recessed part 20 and the other side convex part 24, for example, it does not specifically limit here.
For example, as shown in FIG. 3B, a protruding portion 20 a may be formed at the center in the radial direction of the one-side concave portion 20, and a recess portion 24 a may be formed at the radial center of the other-side convex portion 24.

  As described above, according to the first modified example, the one-side divided surface Sa and the other-side divided surface Sb are provided by applying the radial step (FIGS. 3A and 3B) to the engaging portion of the divided portion 10. In the state in which both the engaging portions are engaged with each other (FIG. 1A), the protruding portion 20a and the recessed portion 24a are engaged in the radial direction, and therefore, one split is held via the divided portion 10. It is possible to prevent the vessel 2 from expanding in the radial direction and expanding (expanding).

  As a second modification, as shown in FIG. 4, the end surface 18t of the one-side convex portion 18 on the outer side of each one-side convex portion 18 (that is, close to the annular portions 4, 6) may be tapered. Good. Thereby, the strength (rigidity) of the root portion of each one-side convex portion 18 (specifically, the portion continuing from the end surface 18t to the one-side divided surface Sa) can be increased. As a result, the durability of the engaging portion of the divided portion 10 can be improved. In correspondence with the taper of the end surface 18t of the one side convex portion 18, the other side concave portion 22 into which the one side convex portion 18 enters and engages is also opposed to the end surface 18t described above, It is preferable to constitute the end face 22t having a taper.

  As shown in FIG. 5 as a third modified example, chamfers 4r, chamfers are formed at the corners (corners) that transition from the one-side divided surface Sa and the other-side divided surface Sb to the annular portions 4, 6 in the divided portion 10, respectively. 6r may be applied. Thereby, it becomes easy to insert the positioning pin 26 (FIG. 1B) used in the above-described assembly process into the gap A, and the efficiency of the assembly process can be further improved. In addition, although the shape of chamfer 4r, 6r was made into circular arc shape as an example in drawing, it is not limited to this, For example, it is good also as elliptical shape.

  As a fourth modified example, as shown in FIGS. 6A to 6C, the one-piece cage 2 may be provided with lubrication performance improving means. In this case, as an example of the lubricating performance improving means, a lubricant accommodating groove 28 extending along the pillar portion 8 is formed on the outer peripheral side of the plurality of pillar portions 8. In addition, tapered surfaces 4t and 6t that are continuous along the circumferential direction are formed on the outer peripheral sides of the annular portions 4 and 6, respectively, and on the inner peripheral sides of the annular portions 4 and 6, respectively. Step portions 4g and 6g that are recessed from other portions are formed.

  Here, the lubricant accommodating groove 28 may be formed in all of the plurality of pillar portions 8 or may be formed only in the arbitrarily selected pillar portion 8, but the lubrication accommodated in the lubricant accommodating groove 28. In order to spread the agent (for example, grease, oil) evenly over the entire split cage 2, it is preferable to form the same at regular intervals along the circumferential direction.

  The groove width, groove depth, and groove length of the lubricant accommodating groove 28 are not particularly limited here because they are set according to, for example, the size and shape of the column portion 8. Further, the sectional shape of the lubricant accommodating groove 28 is a trapezoidal shape close to a triangular shape as an example in the drawings, but is not limited thereto, and various shapes such as an arc shape and a rectangular shape are applied. be able to. In short, any shape that can accommodate a lubricant (for example, grease or oil) may be used.

  In addition, regarding the inclination angle of the tapered surfaces 4t, 6t and the depression amount and depression shape of the stepped portions 4g, 6g, for example, the usage environment and usage purpose of the one-piece cage 2, or the annular portion 4, Since it is set according to the size, shape, etc. of No. 6, there is no particular limitation here. In short, the inclination angle and step of the taper surfaces 4t and 6t so that the lubricant (eg, grease, oil) can be circulated efficiently with the revolution of the one-piece cage 2 during rotation of the bearing. What is necessary is just to set the hollow amount and the hollow shape of the parts 4g and 6g.

  As described above, according to the fourth modified example, the one-brass retainer 2 is provided with the lubricating performance improving means (lubricant accommodation groove 28, tapered surfaces 4t and 6t, stepped portions 4g and 6g). In combination with the effect of the first embodiment, the lubricant (for example, grease, oil) can be evenly distributed over the entire one-piece cage 2 and the one-piece cage 2 when the bearing is rotated. With this revolution, lubricant (for example, grease, oil) can be circulated efficiently.

  In the fifth modified example shown in FIG. 7, a plurality of diameter-enlargement regulating recesses 30 are formed on one side split surface 10 a on both outer sides in the axial direction of the plurality of one-side projections 18 provided as engaging portions. On the other side dividing surface 10b, on the both axial ends of the plurality of other side concave portions 22 provided as engaging portions, the diameter expansion regulating convex portions 32 that can be engaged with the diameter expansion regulating concave portions 30 are provided. Is formed.

  The axially inner side surface 30t of the diameter expansion restricting recess 30 constitutes the axially outer side surface 18t of the one side convex part 18, and the axial inner side surface 32t of the diameter increasing restricting convex part 32 is the axis of the other side concave part 22. A direction outer surface 22t is formed.

  The axially inner side surface 30t of the diameter-enlargement regulating concave portion 30 and the axially inner side surface 32t of the diameter-enlargement regulating convex portion 32 are formed in a tapered shape in parallel with each other, and the dividing portion 10 is expanded. Thus, when force is applied in the circumferential direction, it is possible to prevent the divided portions 10 from opening too much due to contact with each other. That is, the front end surface of the diameter expansion restricting convex portion 32 and the front end surface of the one side convex portion 18 constituting the axially inner side surface 30t of the diameter expansion restricting concave portion 30 overlap each other when viewed from the circumferential direction. .

Further, the distance between the axial inner side surface 30t of the diameter expansion restricting recess 30 and the axial inner side surface 32t of the diameter increasing restricting convex portion 32 is the same as that of the above embodiment, but the one side convex portion 18 and the other side concave portion 22 are. Is set as satisfying the relationship D> E. Further, the interval I between the axially outer side surface 30o of the diameter-enlarging restricting concave portion 30 and the axially outer side surface 32o of the diameter-enlarging restricting convex portion 32 is also set so as to satisfy the relationship I> E.
Furthermore, if the gap in the direction along the circumferential direction formed between the diameter expansion restricting recess 30 and the diameter expansion restricting convex portion 32 is J, it may be set so as to satisfy the relationship A> J. , A> B = C = J is preferably set so as to satisfy the relationship.

  Thereby, according to the 5th modification, while being able to suppress the division part 10 opening too much at the time of the assembly | attachment to the transmission etc. of the holder | retainer 2, it is guided by the one side recessed part 20 and the other side convex part 24 at the time of a driving | operation. It is possible to suppress wear and breakage of the cage 2.

  In the sixth modified example shown in FIG. 8, the configuration in which the one-side divided surface 10 a and the other-side divided surface 10 b are prevented from shifting in the radial direction with respect to the one-piece cage 2 in the fifth modified example. Of the plurality of diameter expansion restriction convex portions 32, the inner diameter side of one of the diameter expansion restriction convex portions 32 is partially cut away to provide a step in the radial direction, and the other diameter expansion restriction convex portion 32. The outer diameter side is partially cut out to provide a radial step. And in the hollow part 32a formed in the diameter-enlarging restriction convex part 32 cut out on the inner diameter side, the inner diameter side of the adjacent one-side convex part 18 is extended into the diameter-enlargement restriction concave part 30, and the hollow part The projecting portion 18a projecting toward 32a is engaged, and the recess 32a formed in the diameter-enlarging regulating projecting portion 32 with the outer diameter side notched is outside the adjacent one-side projecting portion 18. The protruding part 18a that extends the diameter side into the recessed part 30 for restricting expansion and protrudes toward the recessed part 32a is engaged.

  In the sixth modification, the inner diameter side or the outer diameter side of the convex portion 32 for restricting expansion of diameter is partially cut out to give a step in the radial direction. However, in the seventh modification example shown in FIG. As described above, the inner diameter side or the outer diameter side of the diameter expansion restricting convex portion 32 may be cut out over the entire axial direction to provide a radial step. In this case, the protruding portion 18a formed on the one-side convex portion 18 can be formed larger than in the sixth modified example, and the one-side divided surface 10a and the other-side divided surface 10b are displaced in the radial direction. It is possible to secure a wider facing surface between the recessed portion 32a and the protruding portion 18a.

  In the eighth modification shown in FIG. 10, as a partial improvement of the one-crack retainer 2 according to the above-described first embodiment (specifically, the second modification shown in FIG. 4), The recessed portion 200 may be configured by partially denting the axially central portion of the other-side convex portion 24 (in other words, partially notching).

  Since the size of the hollow portion 200 is set according to the size of the other-side convex portion 24, it is not particularly limited here. Moreover, the shape of the hollow part 200 can be made into arbitrary shapes, such as trapezoid shape, rectangular shape, triangular shape, circular arc shape, for example. As an example, FIG. 10 shows a recessed portion 200 having a trapezoidal shape in a plan view. Then, on both sides of the trapezoidal recessed portion 200, a tapered surface 200s having a tapered shape toward the recessed direction. Thus, the strength (rigidity) of each other-side convex portion 24 remaining on both sides of the recessed portion 200 can be improved. The tapered surface 200s is not always necessary.

  In such a configuration, the circumferential protrusions F1 and F2 between the other convex portion 24 remaining on both sides of the recess 200 and the one concave portion 20, and the one convex portion 18 and the other concave portion 22 The circumferential gaps G1 and G2 are preferably set so as to satisfy the relationship of F1 = F2 and G1 = G2. At this time, the magnitude relationship between F1 (= F2) and G1 (= G2) may be set so as to satisfy the relationship of F1 (= F2)> G1 (= G2), or F1 (= F2) <G1 (= G2) may be set to be satisfied.

  As described above, according to the present modification, the depression 200 is formed in the other convex portion 24, so that the volume difference (thickness difference) with the other column portion 8 is reduced accordingly, It is possible to improve the moldability (molding accuracy) by suppressing the influence of “sink” and the like when forming the cage. Since other effects are the same as those in the first embodiment, the description thereof is omitted.

  Further, in the above-described embodiment and each modification, the single-row type one-break cage 2 has been described, but the technical idea of the present invention is also applied to a double-row type one-break cage. Can do. As a ninth modified example, FIG. 11 shows a central pillar 202 extending along the circumferential direction from the one-side divided region 10a to the other-side divided region 10b. 10 shows a double-row type single-break cage 2 in which the structure of the single-break cage 2 shown in FIG.

  In this case, it is preferable to configure a protruding portion 204 in which a portion of the central portion in the axial direction of the one-side concave portion 20 protrudes toward the central portion in the axial direction of the recessed portion 200. In such a configuration, the size of the protruding portion 204 is not particularly limited here because it is set according to the width of the recessed portion 200. Moreover, the shape of the protrusion part 204 can be made into arbitrary shapes, such as trapezoid shape, rectangular shape, triangular shape, circular arc shape, for example. As an example, FIG. 11 shows a protruding portion 204 having a trapezoidal shape in a plan view, and then, on both sides of the trapezoidal protruding portion 204, tapered surfaces 204s having a tapered shape toward the protruding direction are provided. Thus, it is possible to improve the strength (rigidity) of the double-row type single split cage 2. The tapered surface 204s is not always necessary.

  Moreover, it is preferable to set the configuration position of the protruding portion 204 at a position aligned in the circumferential direction along the central column portion 202. As a result, the strength (rigidity) of the double-row type one-crack retainer 2 can be further improved, and the balance of the one-crack retainer 2 can be maintained and improved.

  In such a configuration, the circumferential gap H between the protrusion 204 and the depression 200 is a circumferential gap F <b> 1 between the other projection 24 remaining on both sides of the depression 200 and the one depression 20. , F2 and the circumferential gap G1, G2 between the one-side convex portion 18 and the other-side concave portion 22 whichever is smaller (ie, matched). preferable. The circumferential gaps F1 and F2 and the circumferential gaps G1 and G2 are preferably set so as to satisfy the relationship of F1 = F2 and G1 = G2. At this time, the magnitude relationship between F1 (= F2) and G1 (= G2) may be set so as to satisfy the relationship of F1 (= F2)> G1 (= G2), or F1 (= F2) <G1 (= G2) may be set to be satisfied.

  As described above, according to the present modification, since the projecting portion 204 is configured, of the pair of pockets 2p adjacent to the projecting portion 204, the corner 2r is near the projecting portion 204 on the central column portion 202 side. Therefore, the strength (rigidity) of the double-row type one-crack cage 2 can be kept constant. In addition, since the other effect is the same as that of the one crack holder 2 shown by FIG. 10, the description is abbreviate | omitted.

  In FIG. 11, the protruding portion 204 is configured by partially protruding the axial central portion of the one-side recessed portion 20, but instead, a protruding portion in the reverse direction is formed by protruding a portion on the recessed portion 200 side. Alternatively, the protruding portion may protrude from both the one-side recess 20 and the recess 200.

  FIG. 12 shows, as a tenth modified example, a double-row type one-splitting cage 2 configured by projecting a projecting portion 204 from both the one-side recessed portion 20 and the recessed portion 200. In this case, the circumferential gap H between the protrusions 204 is the smaller one of the circumferential gaps F1 and F2 and the circumferential gaps G1 and G2 as in the case of the one-piece cage 2 shown in FIG. It may be set in accordance with the circumferential clearance of (i.e., matched).

  According to such a configuration, by configuring the protruding portion 204 from both the one-side recessed portion 20 and the recessed portion 200, among the pockets 2p adjacent to each protruding portion 204, on the central column portion 202 side, In addition, since the thickness near the corner 2r near each protrusion 204 can be sufficiently secured, the strength (rigidity) of the double-row type one-crack cage 2 can be maintained constant. In addition, since the other effect is the same as that of the one crack holder 2 shown by FIG. 10, the description is abbreviate | omitted.

  In addition, in the above-described embodiment and each modification, it is assumed that the one-piece cage 2 is entirely molded (for example, injection molded) with a resin (for example, a thermoplastic resin), Even if the one-crack retainer 2 is formed of an elastic material other than resin, the same effects can be realized by applying the same configuration as that of the above-described embodiment and each modification.

  Next, a radial roller bearing retainer according to another embodiment of the present invention will be described with reference to the accompanying drawings. In other embodiments to be described later, it is possible to easily and sufficiently expand the cracked portion while avoiding a decrease in strength and a decrease in the number of rollers retained, and it is possible to effectively prevent climbing on the inner member. For the purpose of providing a radial roller bearing cage (for example, a one-piece resin cage), a technical idea for realizing this purpose is shown.

  As a bearing in which the radial roller bearing retainer according to the present invention is incorporated, a bearing for pivotally supporting a rotating system in a power mechanism (for example, an automobile transmission) provided in a vehicle such as an automobile or a railway. However, the present invention is not limited to this.

  Such a bearing includes an outer member having a cylindrical outer raceway on an inner peripheral surface (for example, an outer ring or a housing that is maintained in a non-rotating state at all times, a gear or a roller that can rotate when used), and the outer A plurality of members that are incorporated so as to roll between an outer peripheral surface (inner track) of an inner member (for example, an inner ring or a shaft that can rotate when used) and an outer track disposed on the inner diameter side of the outer member. Radial rollers (for example, a plurality of needles) are provided. The size of the bearing, the presence / absence of the inner ring, the size (diameter and length) and the number of rollers, etc. can be arbitrarily set according to the use conditions and purpose of the bearing, and are particularly limited here. do not do.

  These rollers should prevent rolling resistance from increasing and seizing due to friction between the rollers when they roll between the tracks (outer track and inner track). The bearing holder is rotatably held in the pocket. Note that bearing lubrication (oil lubrication or grease lubrication) may be performed in order to more effectively prevent such an increase in rotational resistance or seizure.

  FIG. 13 shows the configuration of a radial roller bearing retainer (hereinafter, referred to as a single fracture retainer) 102 according to the second embodiment of the present invention. In the present embodiment, the one-piece cage 102 is made of a predetermined elastic material (for example, made of resin), and the whole (by rim portions 104a and 104b described later) is injected by injecting the elastic material into a mold. In addition, although it is assumed that the column part 106) is integrally formed (injection molding), it is not excluded to form by other known methods. Further, the molded product after injection molding may be separately subjected to cutting, grinding, or the like to form the one-break cage 102 as a finished product.

  The one-break cage 102 includes a pair of annular portions 104a and 104b (hereinafter referred to as rim portions) and a plurality of column portions 106. It is divided along the crossing (orthogonal) direction. In the divided regions, the pair of rim portions 104a and 104b each form a discontinuous ring shape (substantially C-shaped) having the missing portions 108a and 108b, and the missing portions of the rim portions 104a and 104b. In a state in which 108a and 108b have the same phase with respect to the circumferential direction (the positions of the defect portions 108a and 108b in the circumferential direction match), concentrically oppose each other with respect to the axial direction. Has been placed. That is, the one-crack cage 102 has a substantially cylindrical outer appearance having one divided portion 120 (hereinafter referred to as a crack portion) in the circumferential direction (so-called one-crack cage structure). In addition, what is necessary is just to set arbitrarily the radial dimension of the rim | limb part 104a and the rim | limb part 104b, and the opposing space | interval with respect to an axial direction according to the size of a bearing, etc.

  The plurality of column portions 106 are rollers (not shown) that connect the pair of rim portions 104a and 104b in the axial direction and separate the region between the rim portions 104a and 104b in the circumferential direction of the rim portions 104a and 104b. A pocket 110 for inserting and holding (needle) is formed. That is, one pocket 110 is formed in a space surrounded by two column portions 106 adjacent to each other in the circumferential direction and the pair of rim portions 104a and 104b. As a result, the split cage 102 has a structure in which the column portions 106 and the pockets 110 are alternately arranged in the circumferential direction. However, the rims separated by two column portions 106 (hereinafter referred to as the defect portion proximity column portions 162 and 164) arranged close to both sides in the circumferential direction with respect to the defect portions 108 a and 108 b of the rim portions 104 a and 104 b. A cracked portion (divided portion) 120 exists in the region between the portions 104a and 104b, and the pocket 110 is not formed. Therefore, the one-break cage 102 has a structure in which the rollers are missing only in such a region (that is, the cracked portion 120), that is, one roller is inserted into each pocket 110 except for the region, and these rollers are rotated. The structure is arranged at equal intervals (uniform pitch) with respect to the direction.

  The size of the pocket 110 formed by the column portion 106 may be set so that the roller can be rotatably held in the pocket 110 according to the diameter and length of the roller. In other words, the number of the column portions 106) may be arbitrarily set according to the capacity of the cage 102 (the number of rollers to be held). In addition, the form of the pocket surface (the contact surface with the peripheral surface of the roller) (in other words, the surface shape of the circumferentially facing surface of the adjacent column portion 106) is a concave curved surface (for example, the periphery of the roller). A concave curved surface having a slightly smaller curvature than the surface). The peripheral edge of the pocket 110 may be provided with a protruding portion (for example, a claw-like protrusion for gripping the roller) that narrows the pocket opening so that the roller inserted into the pocket 110 is held so as not to fall off. Is possible.

  As described above, a structure in which the missing portions 108a and 108b are formed in each of the pair of rim portions 104a and 104b, and the cage 102 has one crack portion 120 in the circumferential direction (so-called one-break cage). In the direction in which the cracked portion 120 is expanded with respect to the single crack retainer 102, or another way of grasping, both end surfaces in the circumferential direction of the rim portions 104a and 104b (defect portions 108a and 108b). When a force is applied in the direction in which the opposing surfaces are separated from each other, the entire split cage 102 is elastically deformed. As a result, it is possible to expand the cracked portion 120 (the missing portions 108a and 108b), that is, to enlarge the diameter of the one-crack retainer 102 (endally, the rim portions 104a and 104b). Further, from this state, if the cracked portion 120 is contracted in a different direction, the force is applied in a direction in which both circumferential end surfaces (opposing surfaces of the defective portions 108a and 108b) of the rim portions 104a and 104b are brought close to each other. When applied, the entire one-piece cage 102 is elastically deformed to the original state before the crack 120 is expanded. As a result, the cracked portion 120 (the missing portions 108a and 108b) can be returned to the original state, that is, the one-crack retainer 102 (in the end, the rim portions 104a and 104b) can be reduced in diameter. It is possible to return to the diameter dimension (diameter dimension before expansion). In addition, without applying a force in the direction of reducing the cracked portion 120 to the one-cracked cage 102, the force of the one-cracked cage 102 itself by releasing the force applied in the direction of expanding the cracked portion 120 is released. Only one elastic restoring force, or while applying a force in the shrinking direction to the elastic restoring force, reduce the diameter of the one-piece cage 102 and return it to the original diameter (the diameter before the expansion). A simple cage configuration can also be envisaged.

  Thereby, the diameter dimension of the one-piece cage 102 can be freely expanded / contracted, and it becomes possible to cope with the assembly of the bearing to the rotating shaft having the stepped portion and the flange portion of various sizes. After the bearing is assembled to the rotating shaft, the cracked portion 120 (defect portion 108a, 108b) of the one-crack retainer 102 is expanded again, and the one-crack retainer 102 is dropped or displaced. It is necessary to prevent this, and the one-break cage 102 is provided with a locking mechanism for preventing such a situation. That is, the locking mechanism prevents the deficient portions 108a and 108b from expanding (or re-expanding in the end), thereby maintaining the pair of rim portions 104a and 104b at a constant diameter, and holding the one-break cage 102. It is possible to keep a constant diameter dimension.

  FIG. 13 exemplifies the configuration of a one-piece cage 102 provided with an engaging portion composed of a convex portion 112a and a concave portion 112b fitted together as a locking mechanism. In this case, the convex portion 112a is formed in one divided region (for example, the defective portion adjacent column portion 162) of the defective portion adjacent column portions 162 and 164 that are adjacent to each other in the circumferential direction with the crack portion 120 interposed therebetween and are opposed to each other. The other side divided region (the same, the missing portion proximity column portion 164) is provided with a recess 112b. The convex portion 112a protrudes in a circumferential direction with a predetermined shape and size (length) from the surface of the defective portion adjacent column portion 162 facing the defective portion adjacent column portion 164, and the concave portion 112b fits the convex portion 112a. In order to make it possible, a portion of the defect portion proximity column portion 164 facing the defect portion proximity column portion 162 is cut out from the inner diameter side to the outer diameter side with a predetermined shape and size (depth in the circumferential direction). Yes. In addition, as long as the convex part 112a and the recessed part 112b can be mutually fitted, those shapes and magnitude | sizes (length and depth) etc. are not specifically limited, The material and magnitude | size ( What is necessary is just to set arbitrarily according to a diameter dimension, a width | variety, etc. Moreover, if the said locking mechanism can suppress the re-expansion of the crack part 120 (deletion | deletion part 108a, 108b) of the one-crack retainer 102, the convex part 112a and the recessed part 112b which can be mutually fitted will be used. It is not limited to such a mechanism, and can be appropriately changed to various known mechanisms.

  In the present embodiment, the pair of rim portions 104a and 104b has thin-wall portions 142a and 142b whose inner peripheral portions are larger in diameter than the inner peripheral portion of the column portion 106 and thinner in the radial direction, and the thin-wall portions. It has thicker portions 144a and 144b that are smaller in diameter than the portions 142a and 142b and are thicker in the radial direction. Of the inner peripheral portions of the pair of rim portions 104a and 104b, a portion located on the opposite side of the defect portions 108a and 108b with respect to the center, in other words, 180 degrees from the defect portions 108a and 108b in the circumferential direction. Thin portions 142a and 142b are disposed at portions whose phases are shifted by [deg.] (Portions indicated by 140a and 140b in FIG. 13, hereinafter referred to as starting point portions 140a and 140b). Thus, by arranging the thin wall portions 142a, 142b and the thick wall portions 144a, 144b on the inner peripheral portions of the pair of rim portions 104a, 104b, the direction in which the crack portion 120 is expanded with respect to the cage 102 (each rim When a force is applied to the circumferential end surfaces of the portions 104a and 104b (the direction in which the facing portions of the missing portions 108a and 108b are separated from each other), the thin portions 142a and 142b are more elastic than the thick portions 144a and 144b. It can be deformed, and the entire one-piece cage 102 can be easily elastically deformed. Thereby, the crack part 120 (defect part 108a, 108b) can be expanded easily, ie, the diameter of the one crack holder | retainer 102 can be expanded easily.

These thin wall portions 142a, 142b and thick wall portions 144a, 144b are at least as long as the thin wall portions 142a, 142b are arranged at the starting portions 140a, 140b of the pair of rim portions 104a, 104b. The arrangement interval is not particularly limited and can be arbitrarily set.
For example, FIG. 13 shows a configuration of the cage 102 in which three thin portions 142a and 142b and three thick portions 144a and 144b are arranged. In this case, the thin-walled portions 142a and 142b positioned at the starting point portions 140a and 140b (hereinafter referred to as the starting-point thin-walled portions 142a and 142b for convenience) are arranged one by one at approximately equal intervals on both sides in the circumferential direction. The thick portions 144a and 144b are arranged one by one between the thin portions 142a and 142b adjacent in the circumferential direction. That is, three thin wall portions 142a and 142b and three thick wall portions 144a and 144b are alternately arranged in the circumferential direction with respect to the inner circumferential portion of each rim portion 104a and 104b, and the thin wall portions 142a and 142b adjacent to each other in the circumferential direction. Steps 146a and 146b are formed at the boundaries between the thick portions 144a and 144b. Further, the thin portions 142a and 142b (start thin portions 142a and 142b) are disposed in the vicinity of the starting portions 140a and 140b, and the thick portions 144a and 144b (hereinafter referred to as the defective portions for convenience). Near the thick portion 144a, 144b).

  Further, the three thin portions 142a (starting thin portion 142a) of the rim portion 104a and the three thin portions 142b (starting thin portion 142b) of the rim portion 104b are arranged with the same phase in the circumferential direction. The three thick portions 144a of the rim portion 104a (thick portion near the defect portion 144a) and the three thick portions 144b of the rim portion 104b (thick portion near the defect portion 144b) are also arranged in the circumferential direction. In contrast, both are arranged in the same phase. That is, the thin portion 142a (starting thin portion 142a) and the thick portion 144a (defect portion vicinity thick portion 144a), the thin portion 142b (starting point thin portion 142b) and the thick portion 144b (deletion portion vicinity thick portion 144b). Is arranged symmetrically in the circumferential direction at both rim portions 104a, 104b.

These thin-walled portions 142a and 142b (starting thin-walled portions 142a and 142b) and thick-walled portions 144a and 144b (near-walled portion thick-walled portions 144a and 144b) are composed of a plurality of column portions 106 and pockets 110 (in other words, rollers). The rims 104a and 104b are arranged in the inner peripheral region of the rims 104a and 104b. It is positioned on the pocket 110 rather than on 106. At that time, the thin-walled portions 142a and 142b (starting thin-walled portions 142a and 142b) are continuous with a constant diameter (same diameter) across the plurality of pillars 106 and pockets 110 (in other words, rollers). The thick wall portions 144a and 144b (defect portion vicinity thick wall portions 144a and 144b) also extend over a plurality of column portions 106 and pockets 110 (in other words, rollers) with a constant diameter dimension (the same diameter). Dimension). That is, the thin wall portions 142a and 142b (starting thin wall portions 142a and 142b) and the thick wall portions 144a and 144b (defect portion vicinity thick wall portions 144a and 144b) have a constant thickness in the radial direction, respectively. The thin portions 142a and 142b (starting thin portions 142a and 142b) are thinner in the radial direction than the thick portions 144a and 144b (thick portions near the missing portions 144a and 144b). Continuously over the predetermined area.
Note that the starting thin portions 142a and 142b are positioned so that their circumferential intermediate portions substantially coincide with the starting portions 140a and 140b. Further, the thick portions 144a and 144b in the vicinity of the defect portion are in a state of being divided into two at the defect portions 108a and 108b, but when these are regarded as one as a series, they are continuous over the predetermined region. Will be.

  As described above, in this embodiment, the thin portions 142a and 142b (starting thin portions 142a and 142b) are continuously arranged across the plurality of column portions 106 and the pockets 110 (in other words, rollers). When the crack 120 is expanded, the stress of the force applied to the single crack retainer 102 is dispersed and acted on the entire thin portions 142a, 142b (particularly, the entire starting thin portions 142a, 142b), This can be mitigated. Accordingly, it is possible to effectively avoid the stress from acting on a specific portion of the rim portions 104a and 104b and the column portion 106 which is limited.

  Further, thin portions 142a and 142b and thick portions 144a and 144b are alternately arranged on the inner peripheral portions of the rim portions 104a and 104b, and a step is formed at the boundary between the adjacent thin portions 142a and 142b and the thick portions 144a and 144b. By forming 146a and 146b, it is possible to prevent the wall thickness in the radial direction of the inner peripheral portions of the rim portions 104a and 104b from becoming uniform over the entire circumference, and to change the thickness. Therefore, for example, even when the inner track is recessed in the outer peripheral surface of an inner member (such as an inner ring or a shaft that can be rotated during use) and the one-piece cage 102 serves as an end surface guide, 144a and 144b can be caused to interfere along the edge of the recessed inner raceway, and it is possible to effectively prevent the one-piece cage 102 from riding on the outer peripheral surface of the inner member. . As a result, it is possible to configure the one-piece cage 102 and eventually the bearing without being limited by the configuration around the bearing.

  Furthermore, the thin wall portions 142a and 142b and the thick wall portions 144a and 144b are disposed on the rim portions 104a and 104b, and do not particularly affect the configuration of the column portion 106. For this reason, it becomes possible to make the pillar part 106 thinner. That is, when the same number of rollers are held in the single crack retainer 102 having the same diameter, the column portion 106 becomes thinner as the roller diameter increases, but even in this case, it is difficult to expand the crack portion 120. In other words (in other words, it is difficult to increase the diameter of the single cage 102). Therefore, the roller diameter can be increased without reducing the number of rollers held in the one-piece cage 102, and the load capacity of the bearing can be improved.

As described above, these thin wall portions 142a and 142b and thick wall portions 144a and 144b are at least provided that the thin wall portions 142a and 142b are arranged at the starting points 140a and 140b of the pair of rim portions 104a and 104b. The size, shape, number, and arrangement interval can be arbitrarily set, and the configuration of the thin portions 142a and 142b and the thick portions 144a and 144b is not limited to this embodiment (FIG. 13).
For example, as in the third embodiment of the present invention shown in FIG. 14, the thin wall portions 142a and 142b and the thick wall portions 144a and 144b may be arranged one by one, or the fourth embodiment of the present invention shown in FIG. As in the embodiment, a configuration in which ten thin-walled portions 142a and 142b and ten thick-walled portions 144a and 144b are arranged may be used.

  In the third embodiment, as shown in FIG. 14, one thin part 142a, 142b is arranged on the starting point part 140a, 140b side, and one thick part 144a, 144b is arranged on the defective part 108a, 108b side. The parts 142a and 142b are arranged continuously. In other words, only the thin-walled portions 142a and 142b and the thick-walled portions 144a and 144b in the vicinity of the missing portion are symmetrically arranged in the circumferential direction of both the rim portions 104a and 104b on the inner peripheral portions of the pair of rim portions 104a and 104b. In addition, steps 146a and 146b are formed at the boundary between the starting thin portions 142a and 142b and the defective portions near thick portions 144a and 144b. At that time, the steps 146a and 146b are positioned on the pocket 110 instead of on the pillar portion 106 in the rim portions 104a and 104b.

  Further, in the fourth embodiment, as shown in FIG. 15, a total of ten thin portions 142a including the starting thin portions 142a and 142b at substantially equal intervals from the starting thin portions 142a and 142b to both sides in the circumferential direction. 142b, and 10 thick portions 144a, 144b are disposed between the thin portions 142a, 142b adjacent in the circumferential direction, including the thick portions 144a, 144b in the vicinity of the defective portion. In this case, the thin portions 142 a and 142 b (starting thin portions 142 a and 142 b) are continuous with a constant diameter (same diameter) across one pocket 110 (in other words, a roller) and the two pillars 106. In the pair of rim portions 104a and 104b, pockets 110 (rollers) adjacent to each other on both sides in the circumferential direction are disposed so as to be skipped one by one. In other words, the boundaries (that is, the steps 146a and 146b) between the thin portions 142a and 142b (starting thin portions 142a and 142b) and the thick portions 144a and 144b (thick portions 144a and 144b in the vicinity of the defect portion) are formed by a pair of rims. The portions 104a and 104b are positioned at portions where the column portions 106 are connected (on the column portions 106 in the rim portions 104a and 104b).

  In this way, the boundaries (steps 146a and 146b) between the thin portions 142a and 142b (starting thin portions 142a and 142b) and the thick portions 144a and 144b (thick portions 144a and 144b in the vicinity of the defect portion) are formed at the rim portions 104a and 104b. By positioning on the pillar portion 106 instead of on the pocket 110, the entire one-piece cage 102, that is, the rim portions 104a and 104b (thin portions 142a and 142b and thick portions 144a and 144b) and the pillar portion 106 are integrated. When the injection molding is performed, the mating surface of the mold is positioned on the cross section of the column portion 106, so that the boundary (step difference) as in the second embodiment (FIG. 13) or the third embodiment (FIG. 14). 146a, 146b) can suppress the influence of burrs generated during molding compared to the case where the rim portions 104a, 104b are positioned on the pockets 110. Kill.

In the second embodiment (FIG. 13) and the third embodiment (FIG. 14) described above, the boundaries (steps 146a and 146b) are positioned not on the pockets 110 in the rim portions 104a and 104b but on the pillar portions 106. It is also possible to adopt a configuration.
As an example, FIG. 16 shows, as in the above-described second embodiment (FIG. 13), in a one-cracked cage 102 in which three thin portions 142a and 142b and three thick portions 144a and 144b are arranged. A configuration in which the boundaries (steps 146a and 146b) are positioned not on the pockets 110 in the rim portions 104a and 104b but on the pillar portion 106 is shown as a fifth embodiment of the present invention.

  As described above, according to the one-crack cage 102 according to the second to fifth embodiments (FIGS. 13 to 16) described above, the crack portion is avoided while avoiding a decrease in strength and a decrease in the number of rollers retained. 120 can be easily and sufficiently expanded, and it is possible to effectively prevent the inner member (such as an inner ring or a shaft that can be rotated during use) from riding on the outer peripheral surface.

  In the second to fifth embodiments (FIGS. 13 to 16) described above, the thin portions 142a and 142b (starting thin portions 142a and 142b) and the thick portions 144a and 144b (defects) that are adjacent to each other in the circumferential direction. Steps 146a and 146b are formed at the boundaries between the thick wall portions 144a and 144b), and the thin wall portions 142a and 142b and the thick wall portions 144a and 144b are circumferentially arranged with respect to the inner peripheral portions of the pair of rim portions 104a and 104b. Although they are arranged alternately in the direction, the thin portions 142a and 142b (starting thin portions 142a and 142b) and the thick portions 144a and 144b (thickness in the vicinity of the defect portion) are formed without forming the steps 146a and 146b at the boundaries. It is also possible to assume that the parts 144a and 144b) are continuous.

As described above, the sixth embodiment of the present invention has a configuration in which the thin-walled portions 142a and 142b (starting thin-walled portions 142a and 142b) and the thick-walled portions 144a and 144b (thick portions 144a and 144b in the vicinity of the defect portions) are continuously formed without any step. A form is shown in FIG.
In the present embodiment, the thin wall portions 142a, 142b and the thick wall portions 144a, 144b are gradually reduced in inner diameter from the thinnest portion of the thin wall portions 142a, 142b, and the thickest portions 144a, 144b are thickest. It continues without a step until it reaches the part (FIGS. 17A and 17B). As described above, the thin portions 142a and 142b (starting thin portions 142a and 142b) and the thick portions 144a and 144b (the defective portions adjacent thick portions 144a and 144b) are continuously provided without any step, so that the rim portions 104a and 104b are defective. The center C1 of the virtual inner circumference circle formed by connecting the portions 108a and 108b and the center C2 of the virtual outer circumference circle are shifted, that is, both the circles are decentered (FIG. 17B). In such a configuration of the cage 102, the thinnest portion, which is the portion where the thin portions 142a, 142b are thinnest in the radial direction, corresponds to the starting thin portions 142a, 142b, and the thick portions 144a, 142b, The thickest part, where 144b is the thickest part in the radial direction, corresponds to the thick part 144a, 144b in the vicinity of the defect part.

  In the present embodiment, steps 146a and 146b (FIGS. 13 to 16) are not formed at the boundary between the adjacent thin wall portions 142a and 142b and the thick wall portions 144a and 144b on the inner peripheral portions of the rim portions 104a and 104b. It is possible to prevent the rim portions 104a and 104b from being uniform in thickness in the radial direction of the inner peripheral portion over the entire circumference, and to change the thickness. Therefore, for example, even when the inner track is recessed in the outer peripheral surface of the inner member (such as an inner ring or a shaft that can be rotated during use) and the one-piece cage 2 serves as an end face guide, the starting thin portion Any region of the inner peripheral portion of the rim portion 104a, 104b from the 142a, 142b to the thick portion 144a, 144b in the vicinity of the defect portion can be made to interfere along the edge of the recessed inner track. It is possible to effectively prevent the split cage 102 from riding on the outer peripheral surface of the inner member. As a result, as in the second to fifth embodiments (FIGS. 13 to 16) described above, the one-piece cage 102 and eventually the bearing can be configured without being limited by the configuration around the bearing. It becomes possible.

Note that the present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like. The above-described embodiment and each modification are applied in combination within a feasible range. be able to.
For example, the one-piece cage in the second to sixth embodiments may have a structure having the divided portions described in the first embodiment, and the double row type 1 described in FIGS. 11 and 12. It can also be applied to a split cage.

2 Split cage 2p Pockets 4 and 6 Ring portion 8 Column portion 10 Split portion 10a One side split region 10b The other side split region 30 Diameter expansion restriction concave portion 32 Diameter expansion restriction convex portion Sa One side division surface Sb The other Side split surface

Claims (9)

A pair of annular parts arranged in an annular shape and facing each other;
A plurality of pillars extending continuously between the annular parts and arranged at predetermined intervals along the circumferential direction;
A one-branch retainer formed with a plurality of pockets formed at a predetermined interval along the circumferential direction, formed in a portion surrounded by a pair of annular portions and a plurality of pillar portions,
The one split cage is provided with a dividing portion that divides one place in the circumferential direction along a direction crossing the circumferential direction,
The divided portion is formed in a region extending between adjacent pockets along the circumferential direction, and the one-side divided surface and the other formed by dividing the region at the circumferential center position between the pockets. The side dividing surface is disposed facing the circumferential direction,
The one side split surface and the other side split surface are each provided with engaging portions that can be engaged with each other, and these engaging portions are arranged facing each other in the circumferential direction,
In a state where the engaging portions of both the one-side divided surface and the other-side divided surface are engaged with each other, there is a predetermined gap between the one-side divided surface and the other-side divided surface and between the engaging portions. A one-break cage characterized in that it is constructed. The one-side divided surface is provided with a plurality of one-side convex portions that protrude toward the other-side divided surface and one-side concave portions that are recessed between the one-side convex portions as engaging portions. With
The other-side split surface has a plurality of other-side concave portions that can be engaged with a plurality of one-side convex portions as an engaging portion, and projects between the other-side concave portions toward the one-side split surface, and one side A convex portion on the other side engageable with the concave portion is provided,
In a state where the engaging portions of both the one side dividing surface and the other side dividing surface are engaged with each other, between the one side convex portion and the other side concave portion and between the one side concave portion and the other side convex portion. , Respectively, a predetermined gap is configured,
In the gap, the gap between the engaging portions in the direction along the circumferential direction is set to be smaller than the gap between the one side divided surface and the other side divided surface in the direction along the circumferential direction. The one-piece cage according to claim 1. In a state where the engaging portions of both the one-side divided surface and the other-side divided surface are engaged with each other, the gap between the one-side divided surface and the other-side divided surface in the direction along the circumferential direction, and along the circumferential direction The gap between the engaging portions in the direction is
A gap formed between the one-side divided surface and the other-side divided surface is A,
A gap formed between the one side convex portion and the other side concave portion is B,
When the gap formed between the one side concave portion and the other side convex portion is C,
A> B = C
The one-break cage according to claim 2, which is set so as to satisfy the following relationship. In a state where the engaging portions of both the one-side divided surface and the other-side divided surface are engaged with each other, the gap between the engaging portions in the direction orthogonal to the circumferential direction is
A gap formed between the one side convex portion and the other side concave portion is D,
If the gap formed between the one side concave portion and the other side convex portion is E,
D> E
The one-splitting cage according to claim 2 or 3, characterized in that it is set so as to satisfy the following relationship. The one-side divided surface is formed with a diameter-enlarging restriction recess on the axially outer side of the plurality of one-side protrusions,
On the other side split surface, on the outer side in the axial direction of the plurality of other side recesses, a diameter expansion restricting convex portion that can be engaged with the diameter expansion restricting recess is formed,
The opposite axial side surfaces of the diameter-enlarging restriction recess and the diameter-enlargement restriction convex part are formed in a tapered shape so as to come into contact with each other when the divided part is expanded in the circumferential direction. The one-splitting cage according to any one of claims 2 to 4.   The gap in the direction orthogonal to the circumferential direction formed between the diameter-enlargement regulating concave portion and the diameter-enlargement regulating convex portion is a circumferential direction configured between the one-side concave portion and the other-side convex portion. The one-piece cage according to claim 5, wherein the one-piece cage is larger than a gap in a direction perpendicular to the gap. A pair of annular parts arranged in an annular shape and facing each other;
A plurality of pillars extending continuously between the annular parts and arranged at predetermined intervals along the circumferential direction;
A one-branch retainer formed with a plurality of pockets formed at a predetermined interval along the circumferential direction, formed in a portion surrounded by a pair of annular portions and a plurality of pillar portions,
The one split cage is provided with a dividing portion that divides one place in the circumferential direction along a direction crossing the circumferential direction,
The pair of annular portions are formed such that the radial thickness of the starting portion whose phase is shifted by 180 ° with respect to the circumferential direction from the divided portion is thinner than the radial thickness in the vicinity of the divided portion. A one-piece cage, characterized in that The pair of annular parts includes a thin part and a thick part having different thicknesses in the radial direction, the thin part is located at the starting part, and the thick part is located in the vicinity of the divided part,
The one-crack retainer according to claim 7, wherein a boundary between the thin portion and the thick portion is located on the pocket. The pair of annular parts includes a thin part and a thick part having different thicknesses in the radial direction, the thin part is located at the starting part, and the thick part is located in the vicinity of the divided part,
The single crack retainer according to claim 7, wherein a boundary between the thin portion and the thick portion is located on the column portion.

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