JP6658053B2 - Synthetic resin cage for rolling bearings - Google Patents

Description

  The present invention relates to a synthetic resin cage for a rolling bearing, and more particularly, to a synthetic resin cage for a rolling bearing obtained by adding a reinforcing fiber material to a synthetic resin.

  Generally, a synthetic resin cage applied to a rolling bearing is manufactured by injection molding. Specifically, as shown in FIG. 15, an annular cavity 140 corresponding to a cage as a molded body is formed in a molding die, and is melted from a resin injection gate 150 provided at a peripheral portion of the cavity 140. The resin material (thermoplastic resin) is injected and cooled and solidified to manufacture a cage.

  The melted resin injected into the cavity 140 flows in the cavity 140 as two flows on both sides in the circumferential direction, merges again with the resin injection gate 150 at a position opposite to the radial direction, and is joined to each other. Thus, a weld 100W is formed. In general, since the resin cage molded by injection molding in this way is only one in which the melted resin is fused and integrated, uniform mixing of the melted resin does not occur, and the strength often decreases at a weld of 100 W. Are known.

  Further, in the case where a reinforcing fiber material such as glass fiber, carbon fiber, or metal fiber is added as a reinforcing material to the molten resin, the reinforcing fiber material is oriented perpendicular to the flow direction of the molten resin at 100 W of weld, so that the reinforcing effect is obtained. Does not appear. Further, in a portion other than the weld 100W, the reinforcing fiber material is oriented parallel to the flow direction of the molten resin, so that a difference in strength between the portion and the weld 100W increases.

  In the method for manufacturing a synthetic resin cage described in Patent Literature 1, a first resin reservoir communicating with an opening provided on an inner diameter side at a position corresponding to a weld position of a cavity, and a first resin reservoir adjacent to the first resin reservoir. A cage-forming resin composition is injection-molded using a cage-forming mold having a second resin reservoir communicating with an opening provided in the cavity. The distance between the opening of the second resin reservoir and the opening of the first resin reservoir is within the maximum width of the pocket of the cage, and the opening area of the second resin reservoir is the first resin reservoir. Is smaller than the opening area. As a result, a forced resin flow is caused in the vicinity of the weld, and the reinforcement effect of the weld is enhanced by controlling the fiber orientation.

  In the method of manufacturing a bearing resin cage of Patent Document 2, at least one first resin reservoir into which a molten resin flows, before the weld portion is formed in the cavity, at the periphery of the cavity, and the cavity. And at least one second resin reservoir into which the melted resin flows after the weld is formed therein. Thus, by appropriately setting the position where the first resin reservoir is provided, the position where the weld is generated is controlled, and the formation of the weld in the portion of the resin cage for bearings that requires sufficient strength is suppressed. I am trying to do it. The second resin reservoir into which the melted resin flows after the weld is formed disturbs the orientation of the reinforcing fibers in the weld, thereby improving the strength of the weld.

  In the manufacturing method of the bearing retainer described in Patent Document 3, in the cavity, a resin reservoir is provided at both circumferential sides of the weld position or at the weld position, and the molten resin is injection-molded. Thereby, the bonding strength of the weld surface is improved by orienting at least a part of the reinforcing fiber material located on the weld surface perpendicular to the weld surface.

JP 2010-266064 A JP 2012-236363 A JP 2012-219917 A

  In the manufacturing method described in Patent Literature 1, the first resin pool is provided in a portion coinciding with the weld position, so that the reinforcing fiber material is easily oriented perpendicular to the flow direction near the opening of the first resin pool. In addition, a sufficient reinforcing effect cannot be obtained.

  In the method for manufacturing a resin cage for a bearing described in Patent Literature 2, since the first and second resin reservoirs are provided in a region between the resin injection gates, the material cost of the molten resin increases. There is.

  In the manufacturing method described in Patent Literature 3, when resin pools are provided on both sides in the circumferential direction of the weld, the pressure gradient of the melted resin in the vicinity of the weld is reduced, so that the effect of forcibly causing the flow of the resin is reduced. Would. Further, when the resin pool is provided at the weld position, the reinforcing fiber material is easily oriented perpendicular to the flow direction in the vicinity of the opening of the resin pool, so that a sufficient reinforcing effect cannot be obtained.

  The present invention has been made in view of the above-described problem, and an object of the present invention is to provide a synthetic resin cage for a rolling bearing that can enhance the strength reinforcing effect at a weld portion.

The above object of the present invention is achieved by the following configurations.
(1) a substantially annular base, and a plurality of pillars arranged at a predetermined interval in a circumferential direction and projecting in an axial direction from one axial side surface of the base;
The same number of pockets as the pillars are defined by the opposing surfaces of the adjacent pillars and the one axial side surface of the base,
A synthetic resin cage for a rolling bearing in which a reinforcing fiber material is added to a synthetic resin,
In the weld portion formed in the retainer, the longitudinal direction of the reinforcing fiber material is oriented at an angle within 45 ° with respect to the circumferential direction ,
The bearing synthetic resin cage has a gate mark and a resin reservoir communicating portion mark,
The gate trace is arranged at a position corresponding to the pillar,
The resin reservoir communicating portion trace is provided on an outer peripheral surface of a first pillar portion counted in a circumferential direction from a position radially opposed to the gate trace, and a synthetic resin cage for a rolling bearing is provided . .
(2) a substantially annular base portion, and a plurality of pillar portions arranged at predetermined intervals in a circumferential direction and projecting in the axial direction from one axial side surface of the base portion;
The same number of pockets as the pillars are defined by the opposing surfaces of the adjacent pillars and the one axial side surface of the base,
A synthetic resin cage for a rolling bearing in which a reinforcing fiber material is added to a synthetic resin,
In a weld formed in the retainer, the longitudinal direction of the reinforcing fiber material is irregularly oriented ,
The bearing synthetic resin cage has a gate mark and a resin reservoir communicating portion mark,
The gate trace is arranged at a position corresponding to the pillar,
The resin reservoir communicating portion trace is provided on an outer peripheral surface of a first pillar portion counted in a circumferential direction from a position radially opposed to the gate trace, and a synthetic resin cage for a rolling bearing is provided . .
(3) The weld portion formed in the retainer is formed in an uneven shape such that a center portion thereof is shifted in a circumferential direction from a position of an outer surface of the weld portion, (1) or (2). A) a cage made of a synthetic resin for a rolling bearing according to a).
(4) The rolling bearing according to any one of (1) to (3) , wherein a cross-sectional area of the trace of the resin reservoir communication portion is set to be 1/4 or less of a cross-sectional area of the gate trace. Synthetic resin cage.
(5) The synthetic resin cage for a rolling bearing according to any one of (1) to (4) , which is a crown-shaped cage or a comb-shaped cage.

  According to the synthetic resin cage for a rolling bearing of the present invention, in the weld portion formed in the cage, the longitudinal direction of the reinforcing fiber material is oriented at an angle within 45 ° with respect to the circumferential direction. In addition, the reinforcing fiber material can enhance the effect of reinforcing the weld portion. Thereby, the strength of each part of the synthetic resin cage becomes uniform, and the durability and reliability of the synthetic resin cage are improved.

  According to another synthetic resin cage for a rolling bearing of the present invention, in the weld portion formed in the cage, the longitudinal direction of the reinforcing fiber material is irregularly oriented. Thereby, the effect of reinforcing the weld portion can be enhanced. Thereby, the strength of each part of the synthetic resin cage becomes uniform, and the durability and reliability of the synthetic resin cage are improved.

  Furthermore, since the weld portion formed in the retainer is formed in an uneven shape such that the center portion thereof is circumferentially shifted from the position of the outer surface of the weld portion, the contact area of the molten resin in the weld portion due to the unevenness is reduced. As a result, the joining strength of the weld portion can be improved.

It is a top view of the crown type cage concerning a 1st embodiment of the present invention. It is a figure which shows a mode that molten resin flows in the injection molding of a crown type cage. It is an image figure which shows the process in which a weld part is formed, (a) shows the state just before the front-end | tip of the flowing molten resin joins, (b) shows the state where the front-end | tip of the flowing molten resin has begun to join. (C) is a cross-sectional view showing a state in which one molten resin flows into the other molten resin to deform the weld portion, and (d) is a cross-sectional view showing a state in which the weld portion is solidified. (A) is an enlarged view which shows the orientation of the reinforcing fiber material in the weld part of the crown-shaped cage shown in FIG. 1, and (b) is a schematic view thereof. FIG. 5 is a plan view of a crown-shaped cage of a first comparative example formed by a molding die having no resin reservoir. (A) is an enlarged view showing the orientation of the reinforcing fiber material at the weld portion of the crown-shaped cage of the first comparative example shown in FIG. 5, and (b) is a schematic view thereof. It is a top view of the crown type cage concerning a 2nd embodiment. FIG. 9 is a plan view of a crown holder of a second comparative example formed by a molding die having no resin reservoir. It is a top view of a crown type cage concerning a 3rd embodiment. It is an X section enlarged view which shows the orientation of the reinforcing fiber material in the weld part of the crown type cage shown in FIG. It is a top view of the crown type cage of the 3rd comparative example formed of the molding die which does not have a resin pool. FIG. 12 is an enlarged view of a part XII showing an orientation of a reinforcing fiber material at a weld part of the crown-shaped cage of the third comparative example shown in FIG. 11. It is sectional drawing which shows the weld part of a modification. It is sectional drawing which shows the weld part of other modification. It is sectional drawing of the molding die used for manufacture of the conventional synthetic resin cage.

  Hereinafter, a synthetic resin cage for a rolling bearing according to each embodiment of the present invention will be described in detail with reference to the drawings.

(1st Embodiment)
As shown in FIG. 1, a synthetic resin cage 10 for a rolling bearing of the present embodiment (hereinafter, may be simply referred to as a cage) is a so-called crown-shaped cage, and has a substantially annular base 11. And a plurality of (three in the present embodiment, but not particularly limited to thirteen) pillar portions 20 protruding in the axial direction at predetermined intervals in the circumferential direction from one axial side surface 12 of the base portion 11. A plurality (13 in this embodiment) of which a rolling element (not shown) of the bearing is held by surfaces 22, 22 of a pair of adjacent pillars 20, 20 facing each other and one side surface 12 in the axial direction of the base 11. ) Pockets 30 are defined. That is, the number of the pillar portions 20 and the number of the pockets 30 are the same, and the pillar portions 20 are provided on both circumferential sides of each pocket 30.

  The synthetic resin cage 10 of the present embodiment includes a single gate 51 (so-called one-point gate) in an annular cavity (not shown) formed in a molding die via a substantially cylindrical sprue 55 and a runner 53. ), The molten resin G to which the reinforcing fiber material F is added is injected, and the resin is cooled and solidified.

  The gate 51 is arranged at a position corresponding to the pillar 20, that is, at a position overlapping the pillar 20 in the circumferential direction. In addition, the cavity is formed by dissolving the outer peripheral surface of the first columnar portion 20 (the columnar portion 20 adjacent to the pocket 30 in which the weld portion W is formed) counted in the circumferential direction from the position radially opposed to the gate 51. A resin reservoir 40 capable of storing the resin G is provided. Note that the position of the resin reservoir 40 may be set such that the circumferential distance L1 between the resin reservoir 40 and the weld portion W is set shorter than the circumferential distance L2 between the resin reservoir 40 and the gate 51. In particular, it is not limited to the first pillar portion 20. This makes it easy for the forcible flow of the molten resin G to occur in the weld portion W after the molten resin G has joined.

The cross-sectional area of the communicating portion 42 of the resin reservoir 40 (the cross-sectional area of the trace of the residual resin reservoir in the retainer 1) is） of the cross-sectional area of the gate 51 (the cross-sectional area of the trace of the gate remaining in the retainer 1). It is desirable to set the following. This is because, before the molten resin G joins, as shown in FIG. 2, the molten resin G does not flow into the resin reservoir 40, and after the molten resin G joins and the weld portion W is formed. Then, the flow of the melted resin G into the resin reservoir 40 starts, so that the effect of controlling the orientation of the reinforcing fiber material F by the forced flow of the melted resin G in the weld portion W is more reliably exhibited.

  Examples of the resin material of the cage 10 include polyamide resins such as nylon 46 and nylon 66, polybutylene terephthalate, polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyether nitrile (PEN), and polyethylene terephthalate ( A resin composition obtained by adding 10 to 50 wt% of a reinforcing fiber material F (for example, glass fiber or carbon fiber) to a synthetic resin such as PET (PET) is used.

  Referring to FIGS. 2 and 3 as well, molten resin G containing reinforcing fiber material F injected into the cavity from gate 51 is divided into two sides in the circumferential direction and flows, and the molten resins on both sides approach each other (FIG. a)), the pillar portion 20 provided with the gate 51 and the bottom portion of the pocket 30 radially opposed to each other are joined to each other to form a weld portion W (FIG. 3B). After the molten resin G joins to form a weld W, the molten resin G flows into the resin reservoir 40. For this reason, a pressure gradient of the molten resin G is generated between the weld portion W and the resin reservoir 40, and the molten resin G is forced to flow toward the resin reservoir 40 due to the pressure gradient (FIG. 3C). ). Then, in the weld portion W, the central portion of one resin is cooled and solidified in a state where it enters the other resin, and the synthetic resin cage 10 is formed. Therefore, as shown in FIG. 3D, the weld portion W is formed in an uneven shape such that the central portion thereof is shifted in the circumferential direction from the position of the outer surface Wa of the weld portion W. Further, the uneven shape of the weld portion W is formed by a plurality of arcs in the cross-sectional shape.

  The forced flow of the melted resin G in the weld W controls the orientation of the reinforcing fiber material F in the weld W. That is, as shown in FIG. 4, in the weld portion W (specifically, at least in the circumferential direction area where the weld portion W exists), the longitudinal direction of the reinforcing fiber material F is 45 degrees with respect to the circumferential direction. The reinforcing fiber material F effectively enhances the strength of the weld portion W. Thereby, the durability and reliability of the synthetic resin cage 10 are improved.

  Particularly, in the present embodiment, since the weld portion W is provided at the bottom of the thin pocket 30 (the portion of the base portion 11 where the pillar portion 20 is not located), the reinforcing fiber material F is oriented as described above. In addition, durability and reliability of the pocket 30 provided with the weld portion W are improved.

  In the present embodiment, when the proportion of the reinforcing fiber material F oriented at an angle α of 45 ° or less with respect to the circumferential direction in the weld portion is 50% or more, sufficient strength in the weld portion W is obtained. Obtainable.

  FIG. 5 is a plan view of a synthetic resin cage 10A of a first comparative example for comparison with the synthetic resin cage 10 of the first embodiment. In the synthetic resin cage 10A of the first comparative example, a molten resin G containing a reinforcing fiber material F is injected from one gate 51 into a cavity having no resin reservoir. In this case, the weld portion W is formed along the radial direction at the bottom of the pocket 30 radially facing the pillar portion 20 provided with the gate 51. Then, as shown in FIG. 6, the longitudinal direction of the reinforcing fiber material F in the weld portion W is oriented at an angle β larger than 45 ° with respect to the circumferential direction, that is, along the radial direction of the weld portion W. The ratio of the reinforcing fiber material F to be used increases, the reinforcing effect of the weld portion W is small, and the strength is lower than that of the portion other than the weld portion W.

  As described above, according to the synthetic resin cage 10 of the present embodiment, in the weld portion W formed in the cage 10, the longitudinal direction of the reinforcing fiber material F is set at 45 degrees with respect to the circumferential direction. Since it is oriented at an angle α within °, the reinforcing effect of the weld portion W can be enhanced. Thereby, the strength of each part of the synthetic resin cage 10 becomes uniform, and the durability and reliability of the synthetic resin cage 10 can be improved.

  In addition, the weld portion W formed in the synthetic resin cage 10 is formed in an uneven shape such that the center portion thereof is shifted in the circumferential direction from the position of the outer surface Wa of the weld portion W. The contact area of the molten resin at W increases, and the joining strength of weld portion W can be improved.

(2nd Embodiment)
Next, a synthetic resin cage for a rolling bearing according to a second embodiment of the present invention will be described with reference to FIGS. 7 and 8. In addition, about the same or equivalent part as 1st Embodiment, the same code | symbol is attached | subjected to drawing and the description is abbreviate | omitted or simplified.

  As shown in FIG. 7, the synthetic resin cage 10B of this embodiment includes three cylindrical sprues 55 and runners 53 in an annular cavity (not shown) formed in a molding die. The molten resin G to which the reinforcing fiber material F is added is injected from a gate 51 (a so-called three-point gate method), and is formed by cooling and solidifying.

  The three gates 51 are arranged such that the number of pockets 30 arranged between the gates 51 is equal to each other (five in the embodiment shown in the figure). The three gates 51 are provided at the center of the pillar portion 20 in the circumferential direction, respectively. Further, at the center in the circumferential direction of the second pillar portion 20 clockwise from the pillar portion 20 provided with the gate 51, a resin reservoir 40 capable of storing the molten resin G is provided.

  The melted resin G injected into the cavity from the three gates 51 joins in the pocket 30 located at the center in the circumferential direction of the adjacent gates 51 to form a weld W. The resin pool 40 is provided at the center in the circumferential direction of one of the pillars 20 defining the pocket 30 in which the weld W is formed. Therefore, the position where the weld W is formed and the position where the resin pool 40 is arranged are shifted in the circumferential direction. Then, a pressure gradient is generated between the weld portion W and the resin reservoir 40, and a forced flow of the molten resin G from the weld portion W toward the resin reservoir 40 occurs.

Thereby, the orientation of the reinforcing fiber material F in the weld portion W is controlled, and the longitudinal direction of the reinforcing fiber material F is 45 ° with respect to the circumferential direction, similarly to the one shown in FIG. 3 of the first embodiment. At an angle α within. Thereby, the durability and reliability of the synthetic resin cage 10 are improved. Moreover, since the disordered region of the reinforcing fiber material F in the weld portion W moves to a portion having a large cross-sectional area, the strength of the weld portion W is further improved.
Further, similarly to the first embodiment, the weld portion W is formed in an uneven shape such that the center portion is displaced in the circumferential direction from the position of the outer surface Wa of the weld portion W.

  FIG. 8 is a plan view of a synthetic resin cage 10C of a second comparative example for comparison with the synthetic resin cage 10B of the second embodiment. In the synthetic resin cage 10C of the second comparative example, the reinforcing fiber material F is included in the cavity having no resin reservoir from the three gates 51 arranged similarly to the synthetic resin cage 10B of the second embodiment. The molten resin G is formed by injection. In this case, the weld portion W is formed at the bottom of the pocket 30 located at the center in the circumferential direction of the adjacent gate 51. Then, similarly to the one shown in FIG. 10 of the first embodiment, the longitudinal direction of the reinforcing fiber material F in the weld portion W is along the angle β larger than 45 ° with respect to the circumferential direction, that is, along the radial direction. Thus, the reinforcing effect of the reinforcing fiber material F on the weld portion W is small, and the strength is lower than that of the portion other than the weld portion W.

As described above, according to the synthetic resin cage 10B of the present embodiment, in the weld portion W, the longitudinal direction of the reinforcing fiber material F is oriented at an angle α within 45 ° with respect to the circumferential direction. Therefore, the reinforcing effect of the weld portion W can be enhanced, the strength of each part of the synthetic resin cage 10B becomes uniform, and the durability and reliability of the synthetic resin cage 10B can be improved.
Other configurations and operational effects are the same as those in the first embodiment.

(Third embodiment)
Next, a third embodiment of a synthetic resin cage for a rolling bearing according to the present invention will be described with reference to FIGS. In addition, about the same or equivalent part as 1st Embodiment, the same code | symbol is attached | subjected to drawing and the description is abbreviate | omitted or simplified.

  9 and 10 are a plan view of the synthetic resin cage of the third embodiment and an enlarged view of the X part of FIG. 9 showing the orientation of the reinforcing fiber material at the weld.

  As shown in FIG. 9, the synthetic resin cage 10D of the present embodiment is a so-called comb-shaped cage, and a predetermined shape is provided in the circumferential direction from a substantially annular base 11A and one axial side surface 12A of the base 11A. A plurality of (in the present embodiment, 26) pillar portions 20A protruding in the axial direction at intervals, and mutually facing surfaces 22A, 22A of a pair of adjacent pillar portions 20A, 20A, and one axial end of the base 11A. The side surface 12A defines a plurality (26 in the present embodiment) of pockets 30A that hold rolling elements (not shown) of the bearing. That is, the number of the pillar portions 20A and the number of the pockets 30A are the same, and the pillar portions 20A are provided on both circumferential sides of each pocket 30A.

  A gate 51 is provided on each of the thirteen pillar portions 20A, which is half of the 26 pillar portions 20A. Of the thirteen gates 51, one gate 51 is a large-diameter gate 51a having the largest cross-sectional area opened to the cavity, and the other gates 51 are a medium-diameter gate 51b having a medium cross-sectional area, The small-diameter gate 51c has the smallest cross-sectional area, and the medium-diameter gate 51b and the small-diameter gate 51c are alternately arranged in the circumferential direction. Further, of the plurality of pillar portions 20A where the gate 51 is not provided, a resin reservoir 40 capable of storing the melted resin is provided in the pillar portion 20A which is radially opposed to the pillar portion 20A where the large-diameter gate 51a is provided. ing. The cross-sectional area of the communicating portion 42 of the resin reservoir 40 is set smaller than the cross-sectional area of the small-diameter gate 51c.

  According to such a synthetic resin retainer 10D, the pressure in the cavity decreases from the large-diameter gate 51a toward the resin reservoir 40, a pressure gradient is generated in the cavity, and the pressure increases from the large-diameter gate 51a. Then, the flow of the melted resin G occurs toward the resin reservoir 40 having a low pressure. By the flow of the molten resin G, the orientation of the reinforcing fiber material F, which was once oriented perpendicularly (radially) to the flow direction (circumferential direction) at the time of the merged molten resin G, is controlled, and as shown in FIG. The longitudinal direction of the reinforcing fiber material F is irregularly oriented, and the number of the reinforcing fiber material F oriented in the radial direction or the axial direction is reduced, and a decrease in the strength of the weld portion W can be suppressed.

  Furthermore, in the present embodiment, in some welds W, the forced flow of the molten resin G occurs in the direction in which the cross-sectional area of the flow path increases toward the resin reservoir 40. Therefore, similarly to FIG. 3 (d), the weld portion W is formed in an uneven shape such that the center thereof is shifted in the circumferential direction from the position of the outer surface Wa of the weld portion W. , The contact area of the molten resin increases, and the joining strength of the weld portion W can be improved.

  FIG. 11 is a plan view of a synthetic resin cage 10E of a third comparative example for comparison with the synthetic resin cage 10D of the third embodiment. In the synthetic resin retainer 10E of the third comparative example, the reinforcing fibers are formed from thirteen gates 51, each having a uniform cross-sectional area, that are opened to every other column 20A in a cavity having no resin reservoir. The molten resin G containing the material F is injected and formed. In this case, the weld portion W is formed in the pillar portion 20A located at the center in the circumferential direction of the adjacent gate 51. Then, as shown in FIG. 12, the longitudinal direction of the reinforcing fiber material F in the weld portion W is often oriented in the radial direction or the axial direction, and the reinforcement of the weld portion W by the reinforcing fiber material F is increased. The effect is small, and the strength is lower than that of the portion other than the weld portion W.

As described above, according to the synthetic resin cage 10D of the present embodiment, in the weld portion W formed in the synthetic resin cage 10D, the longitudinal direction of the reinforcing fiber material F is irregularly oriented. Therefore, the reinforcing effect of the weld portion W can be enhanced by the reinforcing fiber material F.
Other configurations and operational effects are the same as those in the first embodiment.

Note that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like can be made as appropriate.
For example, the synthetic resin cage 10 may be either a crown cage or a comb cage, and has the same effect. Further, the number of gates 51, the number of pockets 30, and the number of resin reservoirs 40 are not limited to the numbers shown in the drawing. Further, the position of the weld may be the bottom of the pocket 30 or the column 20 and is arbitrary.

  In addition, the synthetic resin cage 10 of the present invention is suitable for rolling bearings since it has little strength reduction and excellent durability. That is, such a rolling bearing has an inner ring, an outer ring, a plurality of rolling elements provided between the inner ring and the outer ring, and a rolling element that is rotatably held in a pocket, and has excellent durability. , It is possible to satisfy demands such as high-speed rotation and high load.

  FIG. 13 is a cross-sectional view showing a weld portion of a modified example of the synthetic resin cage. The central portion of the weld portion W may be formed in a plurality of uneven shapes and formed in a complicated manner. Thereby, the contact area of the molten resin in weld portion W is increased, and the bonding strength can be further increased.

  FIG. 14 is a cross-sectional view showing a weld portion of another modified example of the synthetic resin cage. In the case where the weld portion W is provided at the bottom of the pocket 30, the circumferential length L of the weld portion W is thin. By being formed longer than the thickness t (the length in the radial direction) or the length in the axial direction, the contact area of the molten resin increases, and the joining strength can be further increased.

10, 10B, 10D Retainer made of synthetic resin for rolling bearing 11, 11A Base 12, 12A One axial side surface 20, 20A Column 22, 22A Opposing surface 30, 30A Pocket F Reinforcement fiber material W Weld

Claims (5)

A substantially annular base, and a plurality of pillars arranged at predetermined intervals in the circumferential direction and projecting in the axial direction from one side surface in the axial direction of the base,
The same number of pockets as the pillars are defined by the opposing surfaces of the adjacent pillars and the one axial side surface of the base,
A synthetic resin cage for a rolling bearing in which a reinforcing fiber material is added to a synthetic resin,
In the weld portion formed in the retainer, the longitudinal direction of the reinforcing fiber material is oriented at an angle within 45 ° with respect to the circumferential direction ,
The bearing synthetic resin cage has a gate mark and a resin reservoir communicating portion mark,
The gate trace is arranged at a position corresponding to the pillar,
The resin reservoir communicating portion trace is provided on an outer peripheral surface of a first pillar portion counted in a circumferential direction from a position radially opposed to the gate trace, and a synthetic resin cage for a rolling bearing is provided . . A substantially annular base, and a plurality of pillars arranged at predetermined intervals in the circumferential direction and projecting in the axial direction from one side surface in the axial direction of the base,
The same number of pockets as the pillars are defined by the opposing surfaces of the adjacent pillars and the one axial side surface of the base,
A synthetic resin cage for a rolling bearing in which a reinforcing fiber material is added to a synthetic resin,
In a weld formed in the retainer, the longitudinal direction of the reinforcing fiber material is irregularly oriented ,
The bearing synthetic resin cage has a gate mark and a resin reservoir communicating portion mark,
The gate trace is arranged at a position corresponding to the pillar,
The resin reservoir communicating portion trace is provided on an outer peripheral surface of a first pillar portion counted in a circumferential direction from a position radially opposed to the gate trace, and a synthetic resin cage for a rolling bearing is provided . .   The rolling part according to claim 1, wherein the weld part formed in the retainer is formed in a concavo-convex shape such that a central part thereof is shifted in a circumferential direction from a position of an outer surface of the weld part. 4. Synthetic resin cage for bearings. Sectional area of the resin reservoir communicating portion ruins, rolling bearing made of synthetic resin according to any one of claims 1 to 3, characterized in that it is set to 1/4 or less of the cross-sectional area of the gate mark Retainer. The synthetic resin cage for a rolling bearing according to any one of claims 1 to 4 , wherein the cage is a crown cage or a comb cage.