JP2628674B2 - Plastic cage for bearing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a plastic cage for various rolling bearings used under severe conditions.

More specifically, the present invention relates to various types of cages for rolling bearings produced from a linear polyphenylene sulfide resin composition having excellent heat resistance, oil resistance, chemical resistance, and the like.

(Prior Art) Generally, rolling bearings are classified into ball bearings and roller bearings according to the types of rolling elements, and each of them is also classified into several types.

The ball bearing cage includes a general type cage shown in FIG. 1, a crown type cage shown in FIG. 2, and a ball bearing cage such as an angular ball bearing and a thrust ball bearing (not shown) shown in FIG. is there. On the other hand, the roller bearing retainer includes a conical roller bearing retainer in FIG. 4, a spherical roller bearing retainer in FIG. 5, a cylindrical roller bearing and a thrust roller bearing (not shown) in FIG. There are roller bearing retainers such as bearings (not shown).

Conventionally, so-called engineering plastics such as polyamide (nylon), polyacetal, polybutylene terephthalate, and fluororesin have been used as materials for plastic retainers, or reinforced by mixing short fibers such as glass fiber and carbon fiber. It has been used in the form of composite materials. Among these materials, polyamide is often used as a material for plastic cages because of its good balance between material cost and performance, and excellent performance has been confirmed under moderate environmental conditions. However, under conditions of continuous use at 120 ° C or higher, or under conditions of constant or intermittent contact with oils such as extreme pressure additive additive oils and chemicals such as acids, the material deteriorates over time, Does not meet the required performance.

In recent years, as plastic retainer materials for bearings used under high-temperature environment conditions exceeding 150 ° C, polyether sulfone (PES), polyetherimide (PEI), polyamideimide (PAI), polyetheretherketone ( So-called super-engineering plastic resins such as PEEK) have been proposed (for example, see Ball Bearing Journal, 227 , 14, 1986). However, these materials are very expensive and have excellent heat resistance and chemical resistance, but physical properties required for the cage, such as moderate flexibility and fatigue resistance required during molding and assembly. It still has problems in terms of sex and so on, so it has not yet been widely used.

Another relatively inexpensive material that can be used for plastic cages used under high temperature conditions is polyphenylene sulfide (PPS), which is extremely brittle,
There are problems with mechanical properties for use in cages. That is, the PPS resin is known as a crystalline thermoplastic resin composed of alternating bonds of benzene rings and sulfur. In the process of producing PPS resins which have been conventionally used, a partially crosslinked or branched structure is partially introduced by heat treatment at a high temperature or intentionally adding a crosslinking agent or a branching agent (hereinafter referred to as a branched structure). PPS resin). That is, conventional high molecular weight P
Since the PS resin is obtained by heat-treating PPS having a relatively low molecular weight in air or an oxygen-containing gas at a high temperature for 1 to 24 hours, a cross-linking reaction occurs due to an active terminal group and has a branched chain or a cross-linked portion. JP-A-53-136100 discloses a method for obtaining a branched PPS resin by using a trivalent or higher polyhaloaromatic compound as a crosslinking agent or a branching agent. A typical branched PPS resin is "Ryton (trade name)" which is commercially available from Philippe Petroleum Corporation of the United States.

On the other hand, a PPS resin in which a molecular chain is linearly grown to a high molecular weight in a polymerization step (hereinafter referred to as a linear PPS resin) has been recently developed (Japanese Patent Application Laid-Open Nos. 61-7332 and 61-7332). Showa 61
-66720). This linear PPS resin has substantially no branched chain, and is easily entangled between molecular chains, and thus has a feature that it has higher toughness than the branched PPS resin.

(Problems to solve the problems) PPS resins conventionally used as molding materials mainly contain many branched and partially crosslinked structures in the molecular structure.
This is a so-called branched PPS resin. Branched PPS resin is linear
It is fragile due to its low toughness compared to PPS resin, so it requires a relatively strong forcible removal during molding, so cages for crown-shaped ball bearings, cages for conical roller bearings, spherical surfaces with large roller holding,
In the case of a cage for a cylindrical roller bearing or the like, the shape must be limited to a specific range. Also, cages using branched PPS resin have the problem that claws, columns, rings, flanges, etc. of the cage are easily broken in the bearing assembly process. This is due to the inherent lack of flexibility that is the main reason that PPS resin cages are not currently commercially produced.
The present invention uses a linear PPS resin having greatly improved low toughness, which is a drawback of the conventional branched PPS resin, as a main component of the composition, so that it can be used under severe environmental conditions including high temperatures. It is intended to provide an elastic plastic retainer.

(Means for Solving the Problems) The present invention provides a method for manufacturing a cage by using a composition using a linear PPS resin in which a molecular chain is linearly grown to a high molecular weight in a polymerization stage as a matrix resin. The above problem has been solved.

The heat-resistant plastic retainer of the present invention is produced from a linear PPS resin composition and has excellent heat resistance, oil resistance, chemical resistance and high mechanical properties. By using linear PPS resin as a base, it is possible to obtain the snap fit required for the cage, and to use it for a long time under severe use conditions such as high temperature, high speed rotation condition, high load condition etc. We provide cages that can withstand.

The PPS resin constituting the matrix of the composition used in the plastic retainer of the present invention is described in JP-A-61-7 / 1986.
It is suitably manufactured by the methods disclosed in JP-A-332 and JP-A-61-66720. After polymerization, this PPS resin has not been subjected to heat treatment at high temperatures, and has not been added with a crosslinking agent or a branching agent.
When measured at 310 ° C. and a shear rate of 200 (sec) ⁻¹ , it is 700 poise or more. Such a linear PPS resin can be obtained from Kureha Chemical Industry Co., Ltd. as “Fortron KPS (trade name)”. The linear PPS resin is superior in mechanical properties such as toughness as described above to the branched PPS resin, and at the same molecular weight, the entanglement between molecular chains is larger than that of the branched PPS resin. Therefore, the toughness of the composition can be significantly improved. In addition, since the linear PPS resin has a small molding shrinkage, the dimensional accuracy of the molded product can be improved.

Depending on the type of cage, the cage is forcibly released from the mold at the final stage of injection molding, so-called "forcible removal", or the rolling element is inserted into the pocket of the cage during bearing assembly. When the fitting is performed, the periphery of the pocket or the flange is forcibly expanded. At this time, the so-called “assembly deformability” that the periphery of the pocket is not deformed or the flange is not damaged may be required.

On the other hand, in another type of cage, the rolling element is received on a wider surface so that the rolling element does not fall off so that the posture of the rolling element can be correctly maintained even when receiving a force from the rolling element generated during operation. In order to maintain the posture of the rolling element correctly, it may be necessary to secure a holding amount commonly known as a so-called “roller holding amount” that restricts more rolling elements in the pocket. This type of cage has a locking portion for incorporating and holding a rolling element in a pocket instead of reducing deformation of a flange or a column portion.

In view of such circumstances, a bearing retainer according to the present invention of the type in which a ball is held by two claw portions extending from a flange, wherein the mold is used when the mold is released during mold release in a manufacturing process.
The retainer for a crown type ball bearing as a typical example, in which the claw portion of the book is forcibly pulled out so as to be spread out, is relatively easily deformed when forcibly pulled out or when the ball is assembled. The content of the glass fiber is set to 10 to 20% by weight.

Further, according to the present invention, there is provided a bearing retainer of a type in which relatively thin flanges having different diameters are connected by two relatively thin pillars to hold a conical roller, and the mold is released when the mold is released in a manufacturing process. In the so-called cage for a conical roller bearing, which is forcibly removed while deforming the column portion relatively largely, glass fiber is contained so that it is relatively easily deformed when forcibly removing or assembling the rollers. Quantity 10
To 20% by weight. In a conical roller bearing retainer, the deformability when assembling the roller is more important than in a crown type bearing retainer.

On the other hand, at the time of mold release in the manufacturing process according to the present invention, the retainer is not greatly deformed, but the rolling element is received on a wider surface and the posture thereof is more strongly restrained, so that the rolling element can be rolled during operation. In a bearing retainer of the type that correctly controls the posture of the moving body, it is necessary to support a relatively large force from the rolling body generated during operation rather than the deformability, and therefore, with the intention of improving heat resistance and corrosion resistance The content of glass fiber is set to 20 to 40% by weight.

The PPS resin composition can contain various fillers in arbitrary amounts according to the purpose.

The filler is appropriately added as needed to increase the rigidity of the cage and to improve the dimensional accuracy.

The present invention relates to a bearing retainer using a linear PPS resin appropriately filled with glass fibers.

As the glass fiber to be mixed with the linear PPS resin composition used in the cage of the present invention, any commercially available product can be used, and preferably, the average fiber length is 1 to 0.2 mm, the average It is a short fiber having a fiber diameter of 20 to 5 μm.

Glass fiber is 0 to 50 based on the total weight of the PPS resin composition.
%, Preferably 10 to 20, or 20 to 40% by weight, depending on the type of bearing. If the added amount of glass fiber exceeds 50% by weight, the deformability of the material becomes extremely small, so that it becomes difficult to forcibly remove the cage at the time of molding the cage, and the cage is damaged at the time of assembling the bearing. If the glass fiber content is less than 10% by weight, the effect of reinforcing the mechanical properties is small, and the heat resistance is also insufficient.

In addition, as for the cage for the crown type ball bearing and the cage for the conical roller bearing which require higher mechanical strength, the addition amount of the glass fiber is 0 to 35% by weight, preferably 10 to It turns out that it is 20 weight%.

Means for blending the components of the resin composition used to manufacture the cage of the present invention is not particularly limited. Each component can be separately supplied to the melt mixer, or each component can be preliminarily mixed by a mixer such as a Henschel mixer or a ribbon blender and then supplied to the melt mixer. Any apparatus such as a short-screw or twin-screw extruder, a mixing roll, a pressure kneader, and a Brabender plastograph can be used as the melt mixer.

Incidentally, for the resin composition used in the production of the cage of the present invention, as long as the effects of the present invention are not significantly reduced.
For the purpose of improving processing stability, surface properties, toughness, coloring, antistatic, etc., appropriate amounts of various stabilizers, fluidity improvers, surface modifiers, coloring agents, antistatic agents, etc. resin,
An inorganic or organic reinforcing filler or the like may be added as appropriate.

(Example) Hereinafter, an example of the present invention will be described in detail, but the present invention is not limited thereto.

(Examples 1-1 and 1-2 and Comparative Examples 1-1, 2-1 and 1
-2, 2-2) Retainers for conical loco bearings were prepared using the compositions shown in Table 1 below, and various tests were performed.

For the production of the composition, "Fortron (registered trademark) KPS W214" manufactured by Kureha Chemical Industry Co., Ltd. was used as a linear PPS resin.
As a branched PPS resin, and “Topen (registered trademark) T4” manufactured by Topren Co., Ltd. as a heat-resistant nylon 6,6 resin, as “Ube Nylon (registered trademark) 2020” manufactured by Ube Industries, Ltd.
U ", and glass short fiber" FESS-015-0413 "(average fiber length 500 m, diameter 10 m) manufactured by Fuji Fiber Glass Co., Ltd. was used as the glass fiber. Using a Henschel Mixer FM-10B manufactured by Mitsui Miike Seisakusho, the composition shown in Table 1 was mixed, and a twin screw extruder (MODEL PCM manufactured by Ikegai Iron Works Co., Ltd.) was used.
After kneading by -30) and extruding into pellets, a cage for conical roller bearings was prepared using an injection molding machine (PROMAT 165/75) manufactured by Sumitomo Heavy Industries, Ltd. Using this cage, a heat deterioration test and an oil deterioration test were performed.

In the thermal deterioration test, the cage was placed in a hot air circulating thermostat at 170 ° C.
It was left for a predetermined time up to 00 hours. On the other hand, in the degradation test in oil, the cage was immersed in Mobil SHC629 (synthetic lubricating oil containing an extreme pressure additive) and allowed to stand in a hot air circulating thermostat at 150 ° C. for a predetermined period of up to 500 hours.

Take out the small diameter flange from the cage after the test,
Attach it to a push-pull stand (SVH-12) manufactured by Imada Manufacturing Co., Ltd. so that the gate part is positioned horizontally, conduct an annular tensile test at a tensile speed of 10 mm / min., And determine the breaking load and breaking elongation (based on the inner diameter). I asked. The weight change rate of the cage after deterioration was measured. Further, in order to test the assembling property of the rollers into the retainer, an assembling test was performed using an air-driven automatic roller assembling device manufactured by Nippon Seiko Co., Ltd.
As shown in FIGS. 7A and 7B, the air-driven roller assembling device used for the test, after equally distributing the rollers on the inner pocket surface of the retainer (FIG. 7A), inserting the inner ring, This device allows the entire roller to be instantaneously incorporated into the pocket portion of the retainer by pressing the large-diameter surface with air pressure. That is, in FIG. 7B, the cage 1 in which the frame 6 and the retainer support plate 7 are fixed on the base 5, the rollers are evenly arranged on the inner surface side pocket surface on the retainer support plate 7, and then the inner ring is lightly inserted. The punch 10 provided at the tip of a cylinder rod 9 extending from the air cylinder 8 fixed to the frame 6 is pressed against the large-diameter surface of the inner ring by the air pressure supplied to the cylinder 8. The roller is pressed against the pressing plate 11 and all the rollers are instantaneously incorporated into the pocket portion of the retainer 1. In this case, the cylinder moving speed was 0.2 m / sec, and the load was 60 kgf. In FIG. 7B, the retainer 1, the punch 10, and the inner ring 4 are shown in an axial sectional view.

FIGS. 8A and 8B show the specimens degraded in air (170 ° C.), and FIGS. 9A and 9B show the specimens degraded in oil (150 ° C.). The time-dependent changes in the ring tensile breaking elongation of the cage and the ring tensile breaking elongation evaluated on the basis of the inner diameter are shown.

In the case of deterioration in the air, Example 1-1-a (GF = 10% by weight) and Example 1-1-b (GF = 20% by weight) using a linear PPS resin composition and a branched Comparison between Comparative Example 1-1-a (GF = 10% by weight) and Comparative Example 1-1-b (GF = 20% by weight) using the PPS resin composition (FIG. 8) shows that the ring tension was obtained. Both the breaking load and the ring tensile elongation at break were measured for a cage made of a linear PPS resin composition (Example 1-1).
a, 1-1-b) are superior. The cage of the example maintains a sufficient level to be used as a cage in all the regions of each experiment, but the cage of the comparative example has a performance that cannot be already used as a cage before deterioration. Only have.

On the other hand, Comparative Example 2-1-a (GF = 10% by weight) and Comparative Example 2-1-b using a general-purpose nylon 6,6 resin composition
(GF = 20% by weight) is the value of Example 1-1 before the deterioration test.
-A, and shows higher levels of ring tensile breaking load and ring tensile elongation at break than those of the cages of Example 1-1-b (FIG. 8). In the cage of Comparative Example 2-1-a having a small content, after 300 hours, the cage deteriorates to a level that can no longer be used as a cage.

In the case of deterioration in oil (Figs. 9A and 9B), linear
Example 1-2-a (GF = 10% by weight) and Example 1-2-b (GF = 20% by weight) using a PPS resin composition and Comparative Example 1 using a branched PPS resin composition -2-a (GF = 10
Weight%) and Comparative Example 1-2-b (GF = 20% by weight), the ring tensile breaking load and the ring tensile breaking elongation were both linear cages made of linear PPS resin composition ( Example 1
-2-a and 1-2-b) are more excellent. The change in the breaking load and the breaking elongation rate due to the deterioration time in the examples and the comparative examples is very small, and there is no significant difference in the oil resistance. However, the cage of the example is a cage in all regions of each experiment. In contrast, the cage of the comparative example has a performance that cannot withstand the use as a cage before the deterioration test, while maintaining a level sufficient for use as a cage.

On the other hand, Comparative Example 2-2-a (GF = 10% by weight) and Comparative Example 2-2-b using a general-purpose nylon 6,6 resin composition
(GF = 20% by weight) is the value of Example 1-2 before the deterioration test.
-A, and shows a higher level of annular tensile breaking load and annular tensile elongation at break than the cage of 1-2-b, but decreases rapidly with deterioration time, and after 200 hours, it is no longer a cage. To a level that cannot be used.

FIG. 10A and FIG. 10B show the relationship between the weight change rate and the deterioration time measured for the cage deteriorated in air (170 ° C.) and oil (150 ° C.), respectively.

In the case of deterioration in air, mass loss occurs with time (FIG. 10A), but Example 1 using a linear PPS resin composition was used.
In the case of Comparative Examples 1-1-a and 1-1-b using -1-a, 1-1-b and the branched PPS resin composition, the weight loss rate was extremely small, and there was no significant difference between them. Although not observed and showing good heat resistance, Comparative Examples 2-1-a and 2-1-b using a general-purpose nylon 6,6 resin composition show a remarkable increase in the weight loss rate over time. This indicates that the heat resistance is extremely poor.

On the other hand, in the case of deterioration in oil, the weight increases due to oil penetration over time (Fig. 10B).
Examples 1-2-a and 1-2-b using the PS resin composition and Comparative Examples 1-2-a using the branched PPS resin composition,
In the case of Comparative Examples 2-2a and 2-2b using a general-purpose nylon 6,6 resin composition, the weight increase was extremely small and the oil resistance was excellent in 1-2-b. Shows a marked increase in weight over time, indicating that oil resistance is remarkably inferior.

The results of the roller assembly test are also shown in Table 1 as "roller assembly test success rate".

In Example 1-1-a and Example 1-1-b performed on the cage made of the linear PPS resin composition, Comparative Example 2-1 using the general-purpose nylon 6,6 resin composition cage was performed. -A
Comparative Example 1 performed on a cage made of a branched PPS resin composition, as in Comparative Example 2-1-b, in which the roller was able to be automatically incorporated without any abnormality at a success rate of 100%.
In the case of -1-a and Comparative Example 1-1-b, the flange portion of the retainer was damaged at the time of assembling, and automatic assembling of the rollers was impossible at all.

From the above results, the cage made of the linear PPS resin composition has sufficient performance as a cage under severe conditions such as a high-temperature air atmosphere and a high-temperature oil, as well as a normal use environment. On the other hand, conventional cages made of nylon 6,6 resin composition, which has been widely used in the past, have excellent performance under normal use environment, but deteriorate rapidly in high temperature atmosphere of 150 ° C or higher or high temperature oil, for example. However, it was confirmed that the required performance as a cage was lost in a short time, and that the cage made of the branched PPS resin composition did not already have the required performance as a cage at the time of molding.

Compositions of the proportions shown in Table 2 below (Examples 2-1 and 2-
2. A cage for a spherical roller bearing was prepared using Comparative Examples 3-1, 3-2, 4-1 and 4-2), and various tests were performed.

Linear PPS resin used in the manufacture of each composition, branched PPS
Resin, heat-resistant nylon 6,6 resin, short glass fiber, kneading extruder used for manufacturing pellets of each composition, injection molding machine used for manufacturing cage for spherical roller bearings, air and oil deterioration test specimens The method of preparation, the method of measuring the tensile strength and elongation of the ring performed on the deteriorated cage, and the like were all the same as in Example 1. The test for assembling the roller into the cage was conducted in Example 1.
As in the above, an air-driven automatic roller assembling device manufactured by Nippon Seiko Co., Ltd. (see Fig. 7B) was used. In this case, a special jig shown in Fig. 11 was used. Rollers were incorporated one by one. That is, the support 114 having a slope having the same angle α as the angle between the large-diameter flange surface of the retainer and the column has the same diameter and the same diameter as the small-diameter flange inner diameter of the retainer. A disk 115 having the same height as the height of the retainer is fixed, and the retainer is inserted so that the large-diameter flange surface of the retainer is in contact with the inclined surface of the support base 114. The retainer was fixed so as not to move using the holding plate 116 and the port 117 so as to be located directly above. Thereby, when assembling the rollers, the assembling pressure Pair can be applied perpendicular to the long axis of the rollers. Roller 113 is applied to the uppermost pocket, and punch 10 (see FIG. 7B) provided at the end of a cylinder rod extending from the air cylinder is pressed against roller 113 by air pressure supplied to the cylinder, and the roller is pressed into the pocket of the retainer. Incorporate in Thereafter, the above operation was repeated for the other pockets, and the rollers were assembled one by one, and finally the rollers were assembled in all the pockets. In this case, the cylinder moving speed was 0.2 m / sec, and the load was 60 kgf.

FIG. 12 shows the change over time of the ring tensile breaking load due to the deterioration of the cage for spherical roller bearings in oil (150 ° C.).

Example 2-2a using a linear PPS resin composition (G
F = 25% by weight) and Example 2-2-b (GF = 40% by weight)
And Comparative Example 3-2-a using a branched PPS resin composition
(GF = 25% by weight), the tensile strength at break in the ring was superior to the cage made of the linear PPS resin composition, and was sufficient to be used as a cage in the entire region of each experiment. The level is maintained. On the other hand, the cage of Comparative Example 3-2-a made of the branched PPS resin composition hardly changes with the lapse of time, similarly to the cage made of the linear PPS resin composition, and there is no problem in terms of oil resistance. The strength level has performance close to the limit for use as a retainer.

On the other hand, Comparative Example 4-2-a (GF = 25% by weight) and Comparative Example 4-2-b using a general-purpose nylon 6,6 resin composition
(GF = 40% by weight) in Examples 2-2-a and 2-2-b using the linear PPS resin composition before the deterioration test
Although it exhibits higher breaking strength than the cage of No. 5, it rapidly decreases with the deterioration time, and after 200 hours, it deteriorates to a performance level that can no longer be used as a cage.

FIG. 13 shows the change over time of the weight change rate measured for the cage for a spherical roller bearing aged in air (170 ° C.) and in oil (150 ° C.).

The rate of weight loss in the case of deterioration in air (FIG. 13A) is shown in Examples 2-1-a (GF = 25% by weight) and 2-1-b (GF = 40) using the linear PPS resin composition. % By weight) and Comparative Example 3-1-a (GF = 25% by weight) using the branched PPS resin composition, which is extremely small and shows good heat resistance. In addition, as can be seen from a comparison between Example 2-1-a and Comparative Example 3-1-a having the same glass fiber content, a linear PPS resin composition retainer and a branched PPS resin composition retainer were used. There is no significant difference in heat resistance between the vessels. On the other hand, Comparative Example 4-1-a using a general-purpose nylon 6,6 resin composition (GF = 2
5% by weight) and Comparative Example 4-1-b (GF = 40% by weight) show a sharp increase in the rate of weight loss over time, indicating extremely poor heat resistance.

On the other hand, the rate of weight increase due to deterioration in oil (FIG. 13B) was also confirmed by the results of Examples 2-2-a and 2-2 using the linear PPS resin composition.
-B, and Comparative Example 3- using the branched PPS resin composition
Comparative examples 4-2-a and 4-2 using a general-purpose nylon 6,6 resin composition, whereas the case of 2-a was extremely small and exhibited good oil resistance. In the case of b, the weight increased rapidly with the lapse of time, indicating that the oil resistance was extremely poor.

 The results of the roller incorporation test are also shown in Table 2.

Because the snap of the cage used for the experiment was relatively loose,
In this experiment, the built-in test was 100% successful for all the cages used.

The compositions (Examples 3-1 and 3-
2, Comparative Examples 5-1, 5-2, 6-1; A cage for a cylindrical roller bearing was prepared using 6-2), and various tests were performed.

Linear PPS resin used in the manufacture of each composition, branched PPS
Resin, heat-resistant nylon 6,6 resin, glass staple fiber, kneading extruder used for manufacturing pellets of each composition, injection molding machine used for manufacturing cage for cylindrical roller bearings, air and oil deterioration test specimens The preparation method and the like were all the same as in Example 1. For the measurement of the ring tensile strength and elongation performed on the deteriorated cage, take out the flange part including the weld from the cage as a test piece, and attach it to the push-pull stand so that the weld is located at the top in the vertical direction The procedure was exactly the same as in Example 1 except for the above. The test for assembling the rollers into the cage was the same as in Example 2 except that the special jig shown in FIG. 14 was used. That is, a groove having a rectangular cross section having the same curvature as the outer circumference of the cage and the same width as the thickness of the cage at the upper portion, and having a rectangular cross section having the same width as the pocket height of the cage at the center thereof. Support table with
The retainer 141 is inserted into the retainer support portion 144a of 144 so that an arbitrary pocket portion is positioned horizontally, and the roller 143 is applied to the pocket portion from the inner diameter side of the retainer 141. Next, the support 144
A punch 147 in which an arm 146 having an upper point 145a as a fulcrum fixed to the same frame as a fulcrum is fixed on the center line of the flange of the retainer 141, in a direction perpendicular to the flange surface, and at the midpoint of the arm, the above-mentioned roller 143 Set so that it touches. The jig set in this way is leveled at the position where the other end 148 of the arm contacts the punch 10 (see FIG. 7B) of the cylinder rod extending from the air cylinder of the air-driven automatic roller assembly device, and supplied to the cylinder. Air pressure (Pai
By applying pressure in r), the roller was incorporated into the pocket using the lever principle. Repeat the above operation for the other pockets one by one to install the rollers one by one,
Eventually, we integrated rollers in all pockets. In this case, the assembling speed was 0.2 m / sec, and the load was 60 kgf. The 14th
In the figure, the retainer 141 is shown in a sectional view.

FIGS. 15A and 15B show the time-dependent changes in the ring tensile breaking load measured for the cage for cylindrical roller bearings deteriorated in oil (150 ° C.) and the ring tensile breaking elongation evaluated based on the inner diameter, respectively. Was.

Example 3-2-a using linear PPS resin composition (G
F = 20% by weight) and Example 3-2-b (GF = 25% by weight)
And Comparative Example 5-2-a using a branched PPS resin composition (G
F = 20% by weight), both the ring tensile breaking load (Fig. 15A) and the ring tensile breaking elongation (Fig. 15B) are clearer for the cage made of the linear PPS resin composition. It is excellent, its change is small over the entire measurement range, and maintains a sufficient level that can be used as a cage, but in the case of a cage made of a branched PPS resin composition, it is a low level near the limit of use. It has only the performance of On the other hand, general-purpose nylon 6,6
In the case of Comparative Example 6-2-a (GF = 20% by weight) and Comparative Example 6-2-b (GF = 25% by weight) using the resin composition, the linear PPS was used before the deterioration test. Although it exhibits higher levels of breaking load and breaking elongation than the cage made of the resin composition, each of them suddenly decreases with deterioration time, and after 100 hours, it deteriorates to a level that can no longer be used as a cage.

FIG. 16 shows the change over time of the weight change rate measured for the cylindrical roller bearing retainer deteriorated in air (170 ° C.) and oil (150 ° C.).

In both the weight loss rate in air deterioration (Fig. 16A) and the weight increase rate in oil deterioration (Fig. 16B),
Example 3-1-a using a linear PPS resin composition (GF
= 20% by weight), 3-1-b (GF = 25% by weight), 3-2-
a, 3-2-b, and Comparative Example 5-1-a (GF = 20% by weight) using a branched PPS resin composition; Although showing oil resistance, Comparative Example 6 using a general-purpose nylon 6,6 resin composition
In the case of 1-a (GF = 20% by weight), 6-1-b (GF = 25% by weight), 6-2-a and 6-2-b, the weight changes rapidly with the lapse of time and is extremely heat resistant. It shows that the properties and oil resistance are inferior.

 Table 3 also shows the results of the roller incorporation test.

Example 3 using a cage made of a linear PPS resin composition
1-a and Example 3-1-b, general-purpose nylon 6,6
Similar to Comparative Example 6-1-a and Comparative Example 6-1-b using a resin composition retainer, the success rate was 100%, and the roller could be automatically incorporated without any abnormality. PPS
In Comparative Example 5-1-a using the cage made of the resin composition, the flange portion of the cage was damaged at the time of assembling, and it was impossible to automatically assemble the rollers.

 Table 4 summarizes the above test results.

Table 4 shows FIGS. 8A, 8B, 9A, 9B, 10A,
FIG.10B, FIG.12, FIG.13A, FIG.13B, FIG.15A, FIG.15B
FIG. 16A, FIG. 16A, FIG. 16B, and the results of Tables 1 to 3 are summarized.

As shown in Table 4, the cage manufactured from the linear PPS resin composition was in air (170) regardless of whether it was a cage for a conical roller bearing, a cage for a spherical roller bearing, or a cage for a cylindrical roller bearing. ℃) and in the oil (150 ℃) after the deterioration test, the ring tensile breaking load, the ring tensile breaking elongation rate and the weight change rate are maintained throughout the entire test period, and the mounting test with the roller incorporated It was also confirmed that automatic assembling was possible without any problem as in the case of using a heat-resistant nylon 6,6 resin composition that has been widely used in the past. On the other hand, branched PPS
In the case of the cage manufactured from the resin composition, the heat resistance and oil resistance are good, but the cage is broken in the roller mounting test (except for the loose spherical roller bearing cage with a snap-in margin), as can be seen. Extremely fragile and retains tensile strength It does not meet the performance level that can be used as a container.

On the other hand, the cage manufactured from the heat-resistant nylon 6,6 resin composition has better performance than the cage made of the linear PPS resin composition at the time before the deterioration test, but with the elapse of time, the ring tensile breaking load. , The tensile elongation at break in any case decreases sharply, the weight greatly changes, the heat resistance and oil resistance are extremely poor, and after 100-200 hours, it will no longer be able to be used as a cage. Was confirmed.

Experimental Results The experimental results performed by the applicant will be described in detail below.

Test Example 1 Using a linear PPS resin “Fortron (registered trademark) KPS # 200” manufactured by Kureha Chemical Industry Co., Ltd., and using an injection molding machine IS-22P type manufactured by Toshiba Machine Co., Ltd. A cage for a crown type ball bearing shown in FIG. 2 having several eleven pocket inlet diameters of 6.35 mmφ was manufactured. A heat deterioration test and an oil deterioration test using this cage were performed.

The thermal degradation test was performed by placing the cage in a hot air circulating thermostat at 190 ° C.
It was left for a predetermined time up to 50 hours. On the other hand, the deterioration test in oil was performed by immersing the cage in mobile gear oil 629 (containing SP type extreme pressure additive oil) and leaving it in a hot air circulating thermostat at 150 ° C for 450 hours. Was.

Using the cage after the test as a sample, an annular tensile test was performed at a tensile speed of 8 mm / min. Using a push-pull stand SVH-12 manufactured by Imada Seisakusho, and the annular tensile breaking load and the annular tensile breaking elongation ( (Based on the inner diameter).

In order to test the incorporation of balls into the cage, a 9/32 inch steel ball (regular ball) and a 5/16 inch steel ball (regular ball) were used with an air-driven ball assembling device manufactured by Nippon Seiko Co., Ltd. A ball having a diameter one rank larger than the ball) was used to perform an assembling test. As shown in FIGS.17A and 17B, the pneumatic drive type embedding device used for the test was applied by placing the pocket inlet portion of the retainer on the evenly distributed steel balls and pressing the bottom surface of the retainer by air pressure. This is a device that enables all steel balls to be instantaneously incorporated into the pockets of the cage. That is, the frame 2 and the ball mounting fixture 3 are fixed on the base 1, and the retainer test product is held by the punch 4 provided at the tip of the cylinder rod 5 extending from the cylinder 6 fixed to the frame 2 as shown in the figure. And the steel ball 8 fixed to the ball arrangement fixture 3
Is pressed by the air pressure supplied to the cylinder 6 so that the steel balls 8 are held in the cage 7, and all the steel balls 8 are instantaneously incorporated into the pockets of the cage 7. The retainer 7 retains the steel ball 8 in the pocket while deforming as shown by a broken line in FIG. 17B.

In the heat degradation test in air, changes in weight and changes in appearance were also measured and observed.

Comparative Example 1-A Linear PP manufactured by Kureha Chemical Industry Co., Ltd. used in Test Example 1
Tests were conducted except that the cage was made using a branched PPS resin "Suster (trade name) No.160" manufactured by Tosoh Sastile Co., Ltd. instead of the S resin "Fortron KPS # 200". Exactly the same as Example 1.

After performing a heat deterioration test and an oil deterioration test on the cage of Comparative Example 1-A, an annular tension test was performed. In addition, the above-described ball assembling test was similarly performed.

Comparative Example 1-B The difference from Test Example 1 was exactly the same as Test Example 1 except that a linear PPS resin was used and nylon 6, 6 resin “Ube Nylon 2020U” manufactured by Ube Industries, Ltd. was used. is there.

For Comparative Example 1-B, the same test as in Test Example 1 was performed.

FIG. 18A shows the ring tensile elongation at break after the thermal heating test of Test Example 1 and Comparative Examples 1-A and 1-B, and FIG. 18B after the degradation test in oil.

Comparing the test example 1 using the linear PPS resin with the comparative example 1-A using the branched PPS resin, the case where the sample is left in the air (FIG. 18A) and the case where the sample is left in the oil (FIG. 18A) (Fig. 18B)
In both cases, a cage made of linear PPS resin (Test Example 1) is excellent. The cage of Test Example 1 was used in all areas of each experiment.
Maintains a sufficient level to be used as a cage,
The cage of Comparative Example 1-A already has a performance close to the limit for use as a cage before the test.

On the other hand, Comparative Example 1 using general-purpose nylon 6,6 resin
-B shows an annular tensile elongation at break almost equal to that of the cage of the test example 1 in the untreated state before the test, but the deterioration became severe with the lapse of the test time, and in the air for 250 hours, The elongation at break after 50 hours in oil is below the service limit.

 Table 5 shows the results of the ball assembling test.

In Test Example 1 using a linear PPS resin cage, similarly to Comparative Example 1-B using a general-purpose nylon 6, 6 resin cage, a 9 / 32-inch ball that is a regular sphere was also used. In the case of a 5/16 inch ball, which is one size larger, both had a 100% success rate. However, in the case of Comparative Example 1-A using a branched PPS resin cage, the success rate was 60% for a 9/32 inch ball, and the nail portion was broken, and for a 5/16 inch ball, The ball could not be incorporated at all, and the cage was damaged and scattered.

Next, Table 6 shows the results of observation of changes in weight retention and appearance as indicators of the degree of thermal decomposition of the cage when each cage was left in the air at 190 ° C.

In the cages of Test Example 1 and Comparative Example 1-A, neither change in weight nor change in appearance was observed after 450 hours, indicating that the PPS resin cage has excellent heat resistance. Comparative Example 1-B
The cage had a decrease in weight over time, and fine cracks occurred on the surface of the cage. Cracks become apparent over time.

From the above results, the linear PPS resinous retainer of Test Example 1 has the same performance as the comparatively widely used nylon 6, 6 resin retainer of Comparative Example 1-B under the normal use environment. It has been found that the steel cage can withstand use even in a severe environment such as a high-temperature atmosphere or a high-temperature oil where the cage made of nylon 6, 6 resin cannot be used.

Next, the performance of the cage manufactured from the composition comprising the linear PPS resin and the glass fiber was tested.

Test Example 2 A retainer was manufactured from a composition comprising 80% by weight of linear PPS resin and 20% by weight of glass fiber, and the same test as in Test Example 1 was performed.

The linear PPS resin is “Fortron KPS # 200” manufactured by Kureha Chemical Industry Co., Ltd. The glass fiber is short glass fiber “FESS-015-0413” manufactured by Fuji Fiber Glass Co., Ltd. The average fiber length is 500 μm and the diameter is 10 μm. It was used. 80% by weight of linear PPS resin and 20% by weight of short glass fiber are kneaded and extruded with a twin screw extruder (MODEL PCM-30) manufactured by Ikegai Iron Works Co., Ltd. to form pellets, and then manufactured by Toshiba Machine Co., Ltd. A cage for a crown type ball bearing shown in FIG. 2 was produced in the same manner as in Test Example 1 using an injection molding machine IS-22P.

Using the obtained cage, a heat deterioration test and a ring tension test were performed after the oil deterioration test in the same manner as in Test Example 1, and changes in weight and appearance of the heat deterioration test were also observed.

Comparative Example 2-A Instead of the linear PPS resin of Test Example 2, a branched PPS resin “SUSTELL No. 160” manufactured by Tosoh Sastile Co., Ltd. 8
A composition was prepared from 0% by weight and 20% by weight of glass short fibers, and the cage for a crown type ball bearing shown in FIG. The same test as in Test Example 2 was performed using the molded cage.

Comparative Example 2-B In place of the linear PPS resin of Test Example 2, Ube Industries, Ltd.
Nylon 6,6 resin "Ube Nylon 2020U" 80% by weight
Then, a composition was prepared from the glass fiber and 20% by weight of the glass fiber, and a cage for a crown type ball bearing shown in FIG.
The same test as in Test Example 2 was performed using the molded cage.

FIG. 19A shows the change over time in the ring tensile breaking load when left in air at 190 ° C., and FIG. 19B shows the change over time in the ring tensile breaking load when left in oil at 150 ° C.

The cage of Test Example 2 using the linear PPS resin composition showed excellent results under any conditions as compared with the cage of Comparative Example 2-A using the branched PPS resin composition, and PPS
The cage of the resin composition showed performance exceeding the strength required for the cage under all the experimental conditions. The cage of Comparative Example 2-A using the branched PPS resin composition does not satisfy the performance required for the cage even at the tensile breaking load value before the test.

The cage of Comparative Example 2-B using the nylon 6,6 resin composition shows a higher value in the annular tensile load before the test than the cage of Test Example 2 using the linear PPS resin composition. Degraded severely with the lapse of test time, 200 in air
In 50 hours in oil, it reaches an unusable level.

Table 7 shows the results of weight retention and appearance change when left in the air at 190 ° C.

The cages of Test Example 2 and Comparative Example 2-A using the PPS resin composition show no significant change in weight and appearance, and show excellent heat resistance. The weight of the cage of Comparative Example 2-B made of nylon 6,6 resin composition decreases with the passage of time, and the glass fibers are prominently raised on the surface of the cage. This indicates that the cage is severely deteriorated.

Next, a test was performed on a composition containing 10% by weight of glass fibers.

Test Example 3 Linear PPS resin “FORTRON K” manufactured by Kureha Chemical Industry Co., Ltd.
A cage for a crowned ball bearing was formed from a composition comprising 90% by weight of PS # 200 and 10% by weight of glass short fiber "FESS-015-0413" manufactured by Fuji Fiber Glass Co., Ltd. in the same manner as in Test Example 2. ,
The same test as in Test Example 2 was performed.

Comparative Example 3 A cage similar to that of Test Example 3 was produced using a nylon resin “Ube Nylon 2020U” manufactured by Ube Industries, Ltd. instead of the linear PPS resin of Test Example 3. Therefore, the cage of Comparative Example 3 was composed of 90% by weight of nylon 6, 6 and 10% of short glass fiber.
% By weight.

For the cage of Comparative Example 3, the same experiment as that of the cage of Test Example 3 was performed.

The ring tensile strength and elongation when left in air at 190 ° C. are shown in FIGS. 20A and 20B, respectively, and the ring tensile strength and elongation when left in oil at 150 ° C. are shown in FIGS. 21A and 21B, respectively. Shown in the figure.

The cage of Comparative Example 3 using a nylon resin was in the air,
Both the elongation and the strength before the in-oil test are slightly larger than those of Test Example 3 using the linear PPS resin composition, but the relationship between the two is reversed as the treatment time in the air and in the oil becomes longer. In the case of the nylon cage of Comparative Example 3, at 190 ° C. in air for 200 hours and at 150 ° C. in oil for 50 hours, both the tensile breaking load and the tensile breaking elongation fall below the required levels for the cage. The cage of Test Example 3 has sufficient performance in the entire test area.

Next, the test results using the conical roller bearing cage will be described.

Test Example 4 Linear PPS resin “FORTRON K” manufactured by Kureha Chemical Industry Co., Ltd.
Using a pellet of PS # 200, an injection molding machine IS-22P manufactured by Toshiba Machine Co., Ltd. was used to form a conical roller bearing retainer having 19 pockets as shown in FIG. Using the above-described air-driven roller assembling device manufactured by Nippon Seiko Co., Ltd., an experiment of assembling the rollers into the retainer at a cylinder speed of 0.13 m / sec. Was performed.

Comparative Example 4 In place of the linear PPS resin of Test Example 4, a cage similar to that of Test Example 4 was molded by using a branched PPS resin “Topren T4 (trade name)” manufactured by Topren Corporation. A similar test was performed.

Test Example 5 Linear PPS resin “FORTRON K” manufactured by Kureha Chemical Industry Co., Ltd.
Test Example 2 90% by weight of PS # 200 and 10% by weight of short glass fiber “FESS-015-0423” manufactured by Fuji Fiber Glass Co., Ltd.
The same conical roller bearing retainer as in Test Example 4 was molded from the pellets obtained by kneading and extruding in the same manner as in Test Example 4, and the same roller automatic assembling test as in Test Example 4 was performed.

Comparative Example 5 In place of the straight-chain PPS resin of Test Example 5, a cage for a conical roller bearing was molded using a branched PPS resin “Topren T4” manufactured by Topren Co., Ltd. Was tested.

Table 8 shows the results of the roller assembling tests of Test Examples 4 and 5, and Comparative Examples 4 and 5.

As is clear from Table 8, even if the cage made of the linear PPS resin composition contains 10% by weight of glass fiber, there is no problem in the automatic assembling of the rollers. Even unreinforced products are 100% damaged.

As described above, it can be seen that the cage using the linear PPS resin composition is very advantageous in practice.

The above test results are summarized in Table 9 and FIGS. 22 to 26.

Table 9 shows FIGS. 18A, 18B, 19A, 19B, and 20A.
FIG. 20, FIG. 20B, FIG. 21A, FIG. 21B, and the results of Tables 5-8 are summarized.

Table 9 shows that the crown cage for ball bearings manufactured from the linear PPS resin composition has tensile elongation at break, tensile load at break, weight retention, and tensile break after heat resistance test in oil. In tests of elongation, tensile breaking load, etc., sufficient performance is shown after a lapse of a predetermined time, and a mounting test is as satisfactory as that using a conventional nylon resin.

On the other hand, in a mounting test performed using a cage for a conical roller bearing, a cage using a linear PPS resin composition showed satisfactory results.

From FIG. 22 to FIG. 26, the tensile elongation at break is plotted against the amount of glass fiber after a heat resistance test at 190 ° C. in air and 150 ° C. in oil for 250 hours (FIGS. 22 and 23), FIG. 24 and FIG. 25 are plots of the tensile breaking load against glass fiber, and plots the weight retention in a heat resistance test at 250 ° C. in air at 190 ° C. with respect to the amount of glass fiber (FIG. 24). Figure 26).

As can be seen from FIGS. 22 to 26, as the amount of glass fiber increases, the elongation at break decreases, but the thermal degradation performance improves. Also, from FIG. 26, it can be seen that the cage made of the linear PPS resin composition has a sufficient weight retention after the test, and has no practical problem.

As described above, it can be said that the cage made of the linear PPS resin composition of the present invention is a high-performance cage that can sufficiently withstand use under severe use conditions such as high-temperature atmosphere or high-temperature oil.

As described above, the conical roller bearing cage and the cylindrical roller bearing cage which are considered to be the most disadvantageous for the mounting test from the shape were tested as examples, but when other cages were manufactured with a linear PPS resin composition. It is evident from the above examples that the present invention also shows sufficient performance. Therefore, the cage of the present invention is a cage for a general ball bearing shown in FIG. 1 in addition to the cage for a conical roller bearing, the cage for a spherical roller bearing, and the cage for a cylindrical roller bearing shown in the embodiment. , A cage for an angular ball bearing, a cage for a needle bearing, a cage for a roller clutch and the like shown in FIG.

(Effects of the Invention) As described above, the present invention provides a matrix resin serving as a base of a composition used for manufacturing a retainer in any of the constitutions of the claims as tough, heat and oil resistant (chemical).
Uses a linear PPS resin with excellent durability, so it can withstand long-term use under severe environmental conditions (high-temperature atmosphere, contact with oil and chemicals, high-speed rotation, high-load conditions, etc.) Vessel can be provided. In addition, the cage of the present invention has a snap-fit property required at the time of manufacturing the cage and assembling the bearing, and also has sufficient other mechanical performances.

[Brief description of the drawings]

1 is a perspective view of a cage for a general ball bearing, FIG. 2 is a perspective view of a crown type cage for a ball bearing, FIG. 3 is a perspective view of a cage for an angular ball bearing, and FIG. 4 is a conical roller bearing. FIG. 5 is a perspective view of a cage for a spherical roller bearing, FIG. 6 is a perspective view of a cage for a cylindrical roller bearing, and FIG. FIG. 7B is a schematic view of an air-driven automatic roller assembling apparatus, and FIG.
-1-b, Comparative Examples 1-1-a, 1-1-b, 2-1
FIGS. 8A and 8B are graphs showing the change in the ring tensile breaking load after the in-air (170 ° C.) thermal deterioration test performed on the cages for the conical roller bearings of FIGS. a, 1
-1-b, Comparative Examples 1-1-a, 1-1-b, 2-1
FIGS. 9A and 9A are graphs showing changes in the elongation at break in annular tension after the in-air (170 ° C.) thermal deterioration test performed on the cages for the conical roller bearings of FIGS. -A,
1-2-b, Comparative Examples 1-2-a, 1-2-b, 2-2
FIGS. 9A and 9B are graphs showing the change in the ring tensile breaking load after the in-oil (150 ° C.) deterioration test performed on the cages for the conical roller bearings of FIGS. , 1-2
-B, Comparative Examples 1-2-a, 1-2-b, 2-2-a, 2
FIG. 10A is a graph showing the change in the ring elongation at break elongation after the in-oil (150 ° C.) deterioration test performed on the cage for the conical roller bearing of FIG. -1-
b, Comparative Examples 1-1-a, 1-1-b, 2-1-a, 2-
FIG. 10B is a graph showing the change in the weight loss rate after the deterioration test in air (170 ° C.) performed on the cage for the conical roller bearing of 1-b, and FIG. 10B is a graph showing Examples 1-2-a and 1-2-b. Of the weight increase rate after the in-oil (150 ° C.) deterioration test performed on the cages for the conical roller bearings of Comparative Examples 1-2-a, 1-2-b, 2-2-a and 2-2-b. FIG. 11 is a graph showing the change, FIG. 11 is a schematic view of a jig used for a roller assembling test into a cage for a spherical roller bearing, and FIG. 12 is Examples 2-2-a, 2-2-b,
The graph which shows the change of the annular tensile breaking load after the in-oil (150 degreeC) deterioration test implemented about the cage for spherical roller bearings of Comparative Examples 3-2-a, 4-2-a, and 4-2-b. , 13A
The figure shows Examples 2-1-a and 2-1-b, Comparative Example 3-1.
FIGS. 13B and 13B are graphs showing the change in the weight loss rate after the in-air (170 ° C.) deterioration test performed on the cages for spherical roller bearings a, 4-1-a, and 4-1-b. -2-
a, 2-2-b, Comparative Examples 3-2-a, 4-2-a, 4-
FIG. 14 is a graph showing the change in the rate of weight increase after an in-oil (150 ° C.) deterioration test performed on the cage for 2-b spherical roller bearings, and FIG. 14 shows a test for automatically installing the rollers in the cage for cylindrical roller bearings. FIG. 15A is a schematic view of the jig used, and FIG.
-A, 3-2-b, Comparative Examples 5-2-a, 6-2-a, 6
FIG. 15B is a graph showing the change in ring tensile breaking load after the in-oil (150 ° C.) deterioration test performed on the cage for cylindrical roller bearings of FIG. 2-
b, Changes in the ring tensile elongation at break after the in-oil (150 ° C.) deterioration test performed on the cages for the cylindrical roller bearings of Comparative Examples 5-2-a, 6-2-a, and 6-2-b. Graph diagram,
FIG. 16A shows Examples 3-1-a and 3-1-b, Comparative Example 5-
FIG. 16B is a graph showing the change in the weight loss rate after the in-air (170 ° C.) deterioration test performed on the cages for the cylindrical roller bearings 1-a, 6-1-a, and 6-1-b. Example 3-2
-A, 3-2-b, Comparative Examples 5-2-a, 6-2-a, 6
It is a graph which shows the change of the weight increase rate after the in-oil (150 degreeC) deterioration test implemented about the cage for cylindrical roller bearings of -2-b. 17A is a schematic view of an air-driven ball assembling device, FIG. 17B is a partial cross-sectional view of FIG. 17A, and heat in the air of Test Example 1, Comparative Example 1-A, and Comparative Example 1-B of FIG. 18A. FIG. 18B is a graph showing the ring tensile elongation at break after the deterioration test, and FIG. 18B is a graph showing the ring tensile test results after heat degradation in oil of Test Example 1, Comparative Example 1-A, and Comparative Example 1-B; FIG. 19A shows Test Example 2,
FIG. 19B is a graph showing the tensile elongation at break after the heat degradation test in air of Comparative Example 2-A and Comparative Example 2-B, and FIG. 19B is a graph of Comparative Example 2-A, Comparative Example 2-A and Comparative Example 2-B. FIG. 20A is a graph showing the ring tensile elongation at break after deterioration test in oil, and FIG. 20A shows the ring tensile break load after the heat deterioration test in air of Test Example 3, Comparative Example 3-A, and Comparative Example 3-B. FIG. 20B is a graph showing the ring tensile elongation at break after deterioration in air of Test Example 3, Comparative Example 3-A and Comparative Example 3-B, and FIG. 21A is Test Example 3 and Comparative Example. FIG. 21B is a graph showing the ring tensile strength after the thermal degradation test in oil of 3-A and Comparative Example 3-B, and FIG. 21B is Test Example 3 and Comparative Example 3;
-A, a graph showing the ring tensile elongation after the oil degradation test of Comparative Example 3-B, and FIG. 22 is a graph plotting the tensile elongation at break 250 hours after the heat degradation test in air against the amount of glass fiber. FIG. 23 is a graph in which the tensile elongation at break 250 hours after the thermal degradation test in oil is plotted against the amount of glass fiber, and FIG.
Figure is a graph plotting the tensile breaking load after 250 hours of thermal degradation test in air against the amount of glass fiber, and FIG. 25 is a graph plotting the tensile breaking load after 250 hours of thermal degradation test in oil against the amount of glass fiber, FIG. 26 is a graph in which the weight retention during the thermal degradation test is plotted against the amount of glass fiber.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-254663 (JP, A) JP-A-61-6720 (JP, A) JP-A-61-7332 (JP, A) JP-A-1- 120423 (JP, A) JP-A-63-175065 (JP, A)

Claims (9)

(57) [Claims] (1) A melt temperature of 310 ° C. and a shear rate of 200 / sec.
A plastic retainer comprising a composition containing glass fibers in a linear polyphenylene sulfide resin having a high molecular weight of 0 poise or more, comprising: an annular flange portion; and two extending from the annular flange portion so as to be separated from each other. A bearing retainer having a pocket portion for holding a ball with a pawl, wherein a minimum dimension of a separation interval between the two pawls is smaller than a diameter of the ball. Plastic retainer with 10-20% by weight. 2. A melt temperature of 310 ° C. and a shear rate of 200 / sec.
In a plastic retainer made of a composition containing glass fibers in a linear polyphenylene sulfide resin having a high molecular weight of 0 poise or more, an annular flange having a different diameter, and a column connecting the annular flange in the axial direction are provided. A conical roller bearing retainer having a pocket portion for holding an enclosed conical roller, wherein the conical roller is incorporated so as not to fall off between the pocket portion and an inner raceway surface and a flange surface of the conical roller bearing. A plastic retainer, wherein the content of the glass fiber is 10 to 20% by weight. 3. A melt temperature of 310 ° C. and a shear rate of 200 / sec.
A plastic retainer made of a composition containing glass fibers in a linear polyphenylene sulfide resin having a high molecular weight of 0 or more, and a rolling element surrounded by a plurality of annular flanges and a column connecting the annular flanges A bearing retainer having a pocket portion for holding the glass fiber, wherein the pocket portion has a locking portion for preventing the rolling element from falling off in either the radial direction or the axial direction, and reduces the content of the glass fiber. Plastic retainer with 20-40% by weight. 4. The plastic retainer according to claim 3, wherein said retainer is a retainer for a ball bearing. 5. The plastic cage according to claim 3, wherein said cage is a cage for an angular ball bearing. 6. A plastic cage according to claim 3, wherein said cage is a cage for a spherical roller bearing. 7. The plastic cage according to claim 3, wherein said cage is a cage for a cylindrical roller bearing. 8. The plastic retainer according to claim 3, wherein said retainer is a retainer for a needle roller bearing. 9. A plastic retainer according to claim 3, wherein said retainer is a retainer for a roller clutch.