KR970001608B1 - Plastic retainer for bearing - Google Patents

Abstract

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Description

[Name of invention]

Plastic retainer for bearing

[Brief Description of Drawings]

1 is a perspective view of a retainer for a general ball bearing.

2 is a perspective view of a crown retainer for ball bearings.

3 is a perspective view of a retainer for angular ball bearings.

4 is a perspective view of a retainer for conical roller bearings.

5 is a perspective view of a retainer for spherical roller bearings.

6 is a perspective view of a retainer for cylindrical roller bearings.

7A is a schematic view of a roller device as a retainer for conical roller bearings.

7b is a schematic view of an air driven automatic roller assembly device.

8A shows Examples (1-1-a), (1-1-b), Comparative Examples (1-1-a), (1-1-b), (2-1-a), and (2- Fig. 1-b) is a graph showing the change in the annular tensile breaking load after the deterioration test (170 ° C) in the air for the retainer for conical roller bearings.

8B shows Examples (1-1-a), (1-1-b), Comparative Examples (1-1-a), (1-1-b), (2-1-a), and (2- A graph showing changes in the annular tensile elongation at break after deterioration test (170 ° C.) in the air for the roller bearing bearing 1-b).

9a shows Examples (1-2-a), (1-2-b), Comparative Examples (1-2-a), (1-2-b), (2-2-a), and (2- A graph showing the change in the annular tensile breaking load after deterioration test in oil (150 ° C.) performed for the holder for a conical roller bearing of 2-b).

9b shows Examples (1-2-a), (1-2-b), Comparative Examples (1-2-a), (1-2-b), (2-2-a), and (2- A graph showing the change in the annular tensile elongation at break after deterioration test (150 ° C.) in oil carried out in a holder for a conical roller bearing of 2-b).

10A shows Examples (1-1-a), (1-1-b), Comparative Examples (1-1-a), (1-1-b), (2-1-a), and (2- Fig. 1-b) is a graph showing the change in weight loss rate after the deterioration test (170 ° C) in the air for the retainer for conical roller bearings.

10b shows Examples (1-2-a), (1-2-b), Comparative Examples (1-2-a), (1-2-b), (2-2-a), and (2- A graph showing the change in weight increase rate after (150 ° C) deterioration test in oil carried out in the holder for a conical roller bearing of 2-b).

11 is a schematic view of a tool used for bearing assembly testing to a retainer for spherical roller bearings.

12 shows spherical rollers of Examples (2-2-a), (2-2-b), Comparative Examples (3-2-a), (4-2-a), and (4-2-b). Graph showing changes in the annular tensile breaking load after (150 ° C) deterioration test in bearing retainers.

13a shows spherical rollers of Examples (2-1-a), (2-1-b), Comparative Examples (3-1-a), (4-1-a), and (4-1-b). A graph showing the change in weight loss rate after an air (170 ° C) degradation test performed on bearing retainers.

13B shows the spherical rollers of Examples (2-2-a), (2-2-b), Comparative Examples (3-2-a), (4-2-a), and (4-2-b). Graph showing change in weight increase rate after (150 ° C) deterioration test in bearing retainer.

14 is a schematic view of a tool used for the automatic test of roller assembly to a retainer for cylindrical roller bearings.

15a shows the cylindrical roller bearings of Examples (3-2-a), (3-2-b), Comparative Examples (5-2-a), (6-2-a), and (6-2-b) Graph showing changes in annular tensile breaking load after (150 ° C) deterioration test in an oil retainer.

15B shows the cylindrical roller bearings of Examples (3-2-a), (3-2-b), Comparative Examples (5-2-a), (6-2-a), and (6-2-b). Graph showing the change in the elongation at break of the annulus tensile strain after (150 ° C) deterioration test in the oil retainer.

Figure 16a shows the cylindrical roller bearings of Examples (3-1-a), (3-1-b), Comparative Examples (5-1-a), (6-1-a), and (6-1-b). A graph showing the change in weight loss rate after an air (170 ° C) deterioration test performed on a solvent retainer.

16B shows the cylindrical roller bearings of Examples (3-2-a), (3-2-b), Comparative Examples (5-2-a), (6-2-a), and (6-2-b). It is a graph which shows the change of the weight increase rate after the 150 degreeC deterioration test in the oil holding machine.

Detailed description of the invention

[Technical Field]

The present invention relates to plastic retainers for various rolling bearings used under harsh conditions.

In particular, in various rolling bearing retainers made of a straight chain polyphenylene sulfide resin composition which is excellent in heat resistance, resistance to oil, and resistance to chemical. It is about.

[Background]

Rolling bearings are generally classified into ball bearings and roller bearings according to the type of rolling elements, and each of them is classified into several types.

The ball bearing retainers are known from the general retainer of FIG. 1, the crown retainer of FIG. 2, the retainer for angular bearings of FIG. 3, the retainer for thrust bearings (not shown), and the like. On the other hand, the roller bearing retainer includes the retainer for the conical roller bearing of FIG. 4, the retainer for the spherical roller bearing of FIG. 5, the retainer for the cylindrical roller bearing of FIG. 6, the thrust bearing (not shown), and the thrust spherical surface. Type bearings (not shown) and the like are known.

Conventionally, as a material for plastic retainers, so-called engineering plastics such as polyamide (nylon), polyacetal, polybutylene terephthalate, and fluororesin, or singly or short fibers such as glass fiber or carbon fiber are mixed. It is used in the form of reinforced composite materials. Among these materials, polyamide resin is widely used as a material for plastic retainers because of good balance between material cost and performance, and excellent performance has been confirmed under moderate working environment conditions. However, the material deteriorates over time under continuous or intermittent contact with oils, oils, acids, and other chemicals to which an extreme pressure additive is added, and the performance required in the market. It can not be said to satisfy.

Recently, a plastic retainer material for bearings used in a high temperature environment over 150 ° C, such as polyethersulfone (PES), polyetherimide (PEI), polyamideimide (PAI), polyether ether ketone (PEEK), etc. So-called super-engineered plastic resins have been proposed (see, eg, Ball Bearing Journal, 227, 14, 1986). However, these materials are very expensive and are still widely used because they are excellent in heat resistance and chemical resistance but also have problems in terms of physical properties required as a retainer, for example, proper flexibility and fatigue resistance required during molding or assembly. not.

Another relatively inexpensive material that can be used in plastic retainers used under high temperature conditions is polyphenylene sulfide (PPS), which is very fragile and has problems in terms of mechanical properties for use as a retainer. That is, PPS resin is known as a crystalline thermoplastic resin which consists of alternating bonds of a benzene ring and sulfur. PPS resins that have been conventionally used are partially crosslinked or branched by introducing heat treatment at high temperatures or intentionally adding a crosslinking agent or branching agent in the manufacturing process (hereinafter referred to as branched PSS resin). That is, the conventional high molecular weight PPS resin is obtained by heat-treating a relatively low molecular weight PPS at high temperature in air or oxygen-containing gas for 1 to 24 hours, so that a crosslinking reaction occurs due to active end groups, resulting in branched chains or crosslinking moieties. Have. In addition, Japanese Patent Application Laid-Open No. 53-136100 discloses a method of using a trivalent or higher polyhalogen aromatic chemical as a crosslinking agent or a branching agent to obtain a branched PPS resin. Representative branched PPS resins include Ryton (trade name) commercially available from Philips Petroleum Inc., USA.

On the other hand, PPS resins (hereinafter referred to as straight chain PPS resins) in which molecular chains are grown to high molecular weight in a straight chain form at the polymerization stage have been recently developed (Japanese Patent Application Laid-Open No. 61-7332 and 61). -66720). This straight chain PPS resin is substantially free of branched chains, and is easily characterized by being tougher than branched PPS resins because of easy entanglement between molecular chains.

The PPS resin conventionally used as a molding material is a so-called branched PPS resin mainly containing many branched structures and partially crosslinked structures in molecular structure. Branched PPS resins are more fragile than straight-chain PPS resins and are therefore more fragile, which is why retainers for crowned ball bearings, retainers for conical roller bearings, and rolling, which require compulsory removal of strength during molding. In the case of large spherical, cylindrical roller bearing retainers, etc., the shape must be limited to a specific range. In addition, the retainer using the branched PPS resin has a problem that the engaging portion, the pillar portion, the ring portion, or the flange portion of the retainer is easily damaged in the bearing assembly step. These problems are all due to the inherent lack of flexibility that branched PPS resins have, and is the main reason that PPS resinous retainers are not yet commercially produced.

[Initiation of invention]

An object of the present invention is to provide a heat-resistant plastic retainer that can be used under harsh environmental conditions including high temperature by using a straight chain PPS resin that greatly improves low toughness, which is a drawback of the conventional branched PPS resin, as a main component of the composition. have.

The present invention solves the above problems by preparing a fat or oil with a composition using a straight chain PPS resin in which a molecular chain is grown to a high molecular weight in a straight chain in a polymerization step.

The heat resistant plastic retainer of the present invention is produced from a straight chain PPS resin composition, exhibits excellent heat resistance, oil resistance, chemical resistance, and has excellent mechanical properties. By using a straight chain PPS resin as a base, the snap fit property necessary for the retainer can be obtained, and a retainer that can withstand long-term use under severe use conditions such as high temperature, high speed rotation conditions, and high load conditions is provided. Doing.

The PPS resin constituting the matrix of the composition used for the plastic holder of the present invention is suitably produced by the methods disclosed in Japanese Patent Laid-Open Nos. 61-7332 and 61-66720. The PPS resin is not subjected to heat treatment at a high temperature after polymerization and no crosslinking agent or branching agent is added, but the melt viscosity at which the molecular weight is determined is measured at a shear rate of 200 (seconds) at 310 ° C. More than 700 poise. Such a straight chain PPS resin can be obtained as "Fortron KPS (trade name)" from Kureha Chemical Industry Co. Ltd. As described above, the straight chain PPS resin has superior mechanical properties such as composition compared to the branched PPS resin, and the entanglement between the molecular chains is significantly increased at the same molecular weight as compared to the branched PPS resin. It can be improved. In addition, since the straight chain PPS resin has a low molding shrinkage rate, the dimensional accuracy of the molded article can be improved.

The PPS resin composition of this invention can contain various fillers arbitrarily according to the objective.

Examples of the inorganic fillers include metal oxide powders such as alumina powder and silica powder; Carbide powders such as silicon carbide powder; Nitride powders such as silicon nitride powder; Graphite powder; Carbon black powder; Molybdenum sulfide powder; Tungsten sulfide powder; Glass fibers; Potassium titanate whisker; Silicon carbide fibers; Metal fibers, such as aluminum, copper, and iron, can be used.

Moreover, a phenol resin powder, a silicone resin powder, an aromatic polyamide (aramid) fiber, a fluororesin etc. can be used as an organic filler.

The filler is suitably added as necessary because it increases the rigidity of the retainer and improves the dimensional accuracy.

Glass fibers are used in straight chain PPS resin compositions as preferred fillers of the present invention.

As a glass fiber mix | blended with the straight chain | strand-shaped PPS resin composition used for the holding machine of this invention, arbitrary commercial items can be used, Preferably it is a short fiber with an average fiber length of 1-0.2 mm and an average fiber diameter of 20-5 micrometers. .

The glass fibers are added at 50 wt% or less, preferably 10 to 45 wt%, based on the total weight of the PPS resin composition. When the amount of glass fiber added exceeds 50% by weight, the deformation of the material becomes very small, which makes it difficult to remove the mold excessively during the retainer molding, and breaks the retainer during bearing assembly. When the amount of glass fiber added is less than 10% by weight, the reinforcing effect of the mechanical properties is small, and the heat resistance is also insufficient.

However, with respect to the retainer for the crown-shaped ball bearing and the retainer for the conical roller bearing, which require stronger mechanical strength, the amount of glass fiber added is 35% by weight or less, preferably 10-30% by weight, according to the experimental results described below. It can be seen that. The means for mix | blending the component of the resin composition used for manufacturing the fats and oils of this invention is not specifically limited. The components may be separately supplied to the melt mixer, or the components may be premixed in advance with a mixer such as a Henschell mixer or a ribbon brander and supplied to the melt mixer. As the melt mixer, any apparatus such as a single screw or twin screw extruder, a mixing roll, a pressure kneader, a Brabender blastograph, or the like can be used.

In addition, the resin composition used for manufacturing the retainer of the present invention may be appropriately added as necessary for the purpose of improving processing stability, surface properties, toughness, etc., coloring, antistatic, etc. within the range of not significantly reducing the effect of the present invention. Various stabilizers, fluidity improvers, surface modifiers, colorants, antistatic agents, various resins, fillers for reinforcing inorganic or organic materials, and the like may be appropriately added.

[Examples of the Invention]

Hereinafter, the embodiments of the present invention will be described in detail, but the present invention is not limited thereto.

[Examples (1-1), (1-2) and Comparative Examples (1-1), (1-2), (2-1), (2-2)]

Next, the retainer for conical roller bearings was created using the composition of the ratio shown in Table 1, and various tests were done.

For the preparation of the composition, "Portron® KPS W214" manufactured by Kureha Chemical Industry Co., Ltd. as a straight chain PPS resin, and "Toprene® T4", which is a toprene product, as branched PPS resin, are manufactured. As a heat-resistant nylon 6,6 resin, "Ube nylon (registered trademark) 2020U" made by Ube Industries Co., Ltd., and glass plate fiber "FFSS-015-0413" made by Fuji Fiberglass as a glass fiber (average fiber length) 500um, diameter 10um) was used. Using Henschel Mixer FM-10B manufactured by Mitsui Miei Seisakusho, mixed in the composition shown in (Table 1), mixed extrusion and extruded using a twin screw extruder (MODEL PCM-30) manufactured by EIGA Tech Co., Ltd. After the pellets were made into pellets, a retainer for conical roller bearings was manufactured using an injection molding machine (PROMAT 165/75) manufactured by Shimitomo Jukai Co., Ltd. The deterioration test in oil and the oil deterioration test were implemented using this holder.

In the thermal degradation test, the holder was left in a hot air circulation constant temperature oven at 170 ° C. for a predetermined time up to 500 hours. On the other hand, the deterioration test in oil was immersed in a holding machine in the mobile SHC 629 (extreme pressure additive synthetic lubricating oil) and left for a predetermined time up to 500 hours in a hot air circulation constant temperature bath at 150 ° C.

The flange of the small diameter side is removed from the retainer after the test, and is mounted on the push pull stand (SVH-12) manufactured by Seisakusho Co., Ltd. so that the gate part is positioned in the horizontal direction, and the annular tensile test is performed at a tension speed of 10 mm / mim. The breaking load and the elongation at break (based on inner diameter) were calculated. Moreover, the weight change rate was measured about the holder after deterioration. Moreover, the assembly test was done using the air drive type automatic roller assembly apparatus by Nippon Seiko Co., Ltd. product in order to test the roller assembly property to a retainer. As shown in Figs. 7a and 7b, the air-driven roller assembly device used for the test was arranged on the inner side pocket surface of the retainer (Fig. 7a), and then the inner ring was inserted and the large diameter surface of the inner ring was inserted. It is a device which makes it possible to assemble all the rollers to the pocket part of a holder momentarily by pressing in air pressure. That is, in FIG. 7b, the frame 6 and the retainer support plate 7 are fixed on the base 5, the rollers are arranged on the inner diameter side pocket surface on the retainer support plate 7, and then the inner ring 4 is lightly lightened. Raise the inserted retainer 1, bring the pressing plate 11 to the large diameter surface of the inner ring 4, and end the linder rod 9 extending from the air cylinder 8 fixed to the frame 6; The punch 4 positioned is pressed against the press plate 11 by the air pressure supplied to the cylinder 8, and all the rollers are instantaneously assembled to the pocket of the holder 1 at the same time. In this case, the cylinder moving speed was 0.2 m / sec and the load was 60 kgf. In addition, in FIG. 7B, the holder 1 and the inner ring 4 are shown by axial sectional drawing.

8a and 8b, respectively, for samples deteriorated in air (170 ° C) and 9a and 9b, respectively, for samples deteriorated in oil (150 ° C), respectively. The change in the annular tensile fracture elongation and the elongation at break was evaluated over time.

Example (1-1-a) (GF = 10 wt%) and Example (1-1-b) (GF = 20 wt%) using a straight chain PPS resin composition in case of deterioration in air, Comparing Comparative Example (1-1-a) (GF = 10% by weight) and Comparative Example (1-1-b) (GF = 20% by weight) using the branched PPS resin composition, FIG. 8b), the annular tensile breaking load and the annular tensile breaking elongation are all superior to the retainers of the straight chain PPS resin composition physical properties (Examples 1-1 -a, 1-1-b). The retainer of the example is maintained at a level sufficient to be used as a retainer in all areas of each experiment, but the retainer of the comparative example has only insufficient performance for use as a retainer already in the state before deterioration.

On the other hand, Comparative Example (2-1-a) (GF = 10% by weight) and Comparative Example (2-1-b) (GF = 20% by weight) using the general-purpose nylon 6,6 resin composition were used at the time point before the deterioration test. Although the annular tensile breaking load and the annular tensile elongation at break are higher than those of the holders of Examples (1-1-a) and (1-1-b) (Figs. 8a and 8b), In addition, it is rapidly lowered, and especially in the holder of Comparative Example (2-1-a) having a low content of GF, it deteriorates to a level that can no longer be used as a holder after 300 hours.

Example (1-2-a) (GF = 10% by weight) and Example (1-2-b) using a straight chain PPS resin composition in case of deterioration in oil (Figs. 9a and 9b) ( GF = 20% by weight) and Comparative Example (GF = 10% by weight) using the branched PPS resin composition and Comparative Example (1-2-b) (GF = 20% by weight), respectively In both tensile elongation and elongation, the retainers (Examples 1-2-a, 1-2-b) of the straight chain PPS resin composition were better. In both the Examples and Comparative Examples, the change of the breaking load and the elongation at break due to the deterioration time is slight, and there is no remarkable difference in oil resistance, but the retainer of the Example is sufficient to be used as a retainer in all areas of each experiment. The retainer of the comparative example had only insufficient performance to be used as the retainer at the time point before the deterioration test.

On the other hand, Comparative Example (2-2-a) (GF = 10% by weight) and Comparative Example (2-2-b) (GF = 20% by weight) using the general-purpose nylon 6,6 resin composition were evaluated at the time point before the deterioration test. It shows a higher level of annular tensile breaking load and annular tensile breaking elongation than the retainers of Examples (1-2-a) and (1-2-b), which sharply decreases with deterioration time and after 200 hours Is further lowered to a level insufficient for use as a retainer.

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

In case of deterioration in air, it causes mass loss with time (Fig. 10a). Examples (1-1-a), (1-1-b) and branched PPS resins using a straight chain PPS resin composition In the case of the comparative examples (1-1-a) and (1-1-b) using the composition, the weight loss ratio is very small, and there is no noticeable difference between them, and it shows good heat resistance. The comparative example (2-1-a) (2-1-b) which used the 6 resin composition shows that the remarkable weight reduction rate increases with time, and shows that it is considerably inferior in heat resistance.

On the other hand, in the case of deterioration in oil, it causes mass increase with time (Fig. 10b), but in the case of Example (1-2-a) (1-2-b) using a straight chain PPS resin composition, It shows a small weight increase, which shows good oil resistance. However, in Comparative Example (2-2-a) (2-2-b) using a general-purpose nylon 6,6 resin composition, there is a remarkable increase in weight with time, indicating that oil resistance deteriorates.

The result of the roller assembly test was written together in (Table 1) as "roller assembly test success rate."

In Example (1-1-a) and Example (1-1-b) carried out on the straight chain PPS resin composition holder, Comparative Example (2-1-) using a universal nylon 6,6 resin composition holder Similar to a) and Comparative Example (2-1-b), while the automatic assembly of the rollers was possible without any abnormality at a success rate of 100%, Comparative Example (1-1-a) performed on the holder of the branched PPS resin composition. In the case of Comparative Example (1-1-b), the flange portion of the holder was broken at the time of assembly, and automatic assembly of the rollers was impossible at all.

From the above results, the retainer made of a straight chain PPS resin composition has a sufficient performance as a retainer even under severe conditions such as a high temperature air atmosphere and a high temperature oil, as well as a normal use environment. 6 Resin composition retainer has excellent performance in normal use environment, but it rapidly deteriorates in, for example, a high temperature air atmosphere or a high temperature oil of 150 ° C or more, and loses the required performance as a retainer within a short time. It was confirmed that the retainer did not already have the necessary performance as the retainer at the time of molding.

Next, the composition of the ratio shown to Table 2 [Example (2-1), (2-2), Comparative Example (3-1), (3-2), (4-1), (4- 2)] was used to fabricate a retainer for spherical roller bearings and to carry out various tests.

Straight chain PPS resins, branched PPS resins, heat resistant nylon 6,6 resins, short glass fibers used in the preparation of each composition; Twin screw extruders used for the production of ferrets of the respective compositions; Injection molding machines used for the production of retainers for spherical roller bearings; Preparation of deterioration test specimens in air and in oil; The measurement method of the cyclic tensile elongation performed for the deteriorated retainer was the same as in Example (1). The roller assembly test to the retainer was carried out in the same manner as in Example (1), using an air-driven automatic roller assembly device (see FIG. 7B) manufactured by Nippon Seiko Co., Ltd., in which case the special shown in FIG. Using a tool, rollers were assembled one by one in the pocket of the holder. That is, a disc having a diameter equal to the inner diameter of the small diameter flange of the retainer and a height equal to the height of the retainer on the support 114 having an inclined surface having an angle a equal to the angle formed by the large diameter flange face of the retainer and the stopper. Fix the 115 and insert the retainer so that the large diameter flange face of the retainer is in contact with the inclined surface of the support 114, and the pressing plate 116 and the bolt 117 so that any pocket is located directly above it. The holder was fixed so as not to move. Thereby, the assembly pressure can be loaded perpendicularly to the long axis of the roller in the roller assembly. A punch 10 (see also part 7b) fixed at the end of the cylinder rod extending from the air cylinder by placing the ruler 13 in the top pocket is pressed against the roller 113 by the air pressure supplied to the cylinder, and the roller is held. Assemble in your pocket. Hereinafter, the said operation was repeated also about another pocket in order, and the roller was assembled one by one, and finally the roller was 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 time course change of the circular tensile breaking load with deterioration in oil (150 ° C.) of a retainer for spherical roller bearings.

Example (2-2-a) (GF = 25% by weight) and Example (2-2-b) (GF = 40% by weight) using the straight chain PPS resin composition compared with the branched PPS resin composition Comparing the example (3-2-a) (GF = 25% by weight), the annular tensile strength at break is better in the retainer made of straight chain PPS resin composition, and is suitable for use as a retainer in all areas of each experiment. It is maintained at a sufficient level. At the same time, the holder of Comparative Example (3-2-a) of the branched PPS resin composition has little change with time as in the case of the holder of the straight chain PPS resin composition, and has no problem in terms of oil resistance, but maintains the strength level. It has only performance close to the limit to endure its use as a machine.

On the other hand, Comparative Example (4-2-a) (GF = 25% by weight) and Comparative Example (4-2-b) (GF = 40% by weight) using the general-purpose nylon 6,6 resin composition were obtained before the deterioration test. At this point of time, the fracture strength was higher than that of the holders of Examples (2-2-a) and (2-2-b) using a straight chain PPS resin composition, but rapidly decreased with deterioration time. It further degrades to a performance level that is insufficient for use as a retainer.

FIG. 13 shows the time course of the weight change rate measured for the retainer for spherical roller bearings deteriorated in air (170 ° C.) and oil (150 ° C.).

The weight loss rate (Fig. 13a) in the case of deterioration in air is shown in Example (2-1-a) (GF = 25% by weight), (2-1-a) (GF = 40) using a straight chain PPS resin composition. Weight%) and Comparative Example (3-1-a) (GF = 25% by weight) using the branched PPS resin composition are very small and show good heat resistance. Further, as can be seen from the comparison between Example (2-1-a) and Comparative Example (3-1-a) in which the glass fiber content rates are equivalent, between the straight chain PPS resin composition holder and the branched PPS resin composition holder Notable differences in heat resistance are not recognized. On the other hand, in the case of the comparative example (4-1-a) (GF = 25 weight%) and the comparative example (4-1-b) (GF = 40 weight%) using the general-purpose nylon 6,6 resin composition, time progresses In addition, there is a sharp increase in the rate of weight loss, which shows that the heat resistance is significantly inferior. On the other hand, the weight increase rate (degree 13b) due to deterioration in oil is also used in Examples (2-2-a), (2-2-b) using straight chain PPS resin compositions, and branched PPS resin compositions. In the case of the comparative example (3-2-a), it is very small, Comparative example (4-2-a) using the general-purpose nylon 6,6 resin composition, and (4-2-) compared with these being showing favorable oil resistance. In the case of b), it shows a rapid weight increase with time, and shows that oil resistance is remarkably inferior.

The result of the roller assembly test was written together to (Table 2).

Since the perching values of the retainers used in the experiments were relatively loose, the assembly test was 100% successful for all the retainers used in this experiment.

The composition of the ratio shown to the following Table 3 [(Examples (3-1), (3-2), Comparative Example (5-1), (5-2), (6-1), (6- 2)] was used to manufacture a cylindrical roller bearing retainer and various tests were performed.

Straight chain PPS resin, branched PPS resin, heat resistant nylon 6,6 resin, short glass fiber, biaxial extruder used for the production of the ferret of each composition; Injection molding machines used for the production of retainers for spherical roller bearings; The preparation method of the deterioration test piece in air, oil, etc. were all the same as Example (1). For the measurement of the annular tensile elongation performed on the deteriorated retainer, the flange portion including the weld was removed from the retainer as a test piece, and the welded portion was mounted on the push-pull stand so that the welded portion was positioned in the upper vertical direction. It was exactly the same as in Example (1). The roller assembly test to the retainer was the same as in Example (2) except that a special tool was used as shown in FIG. That is, a support having a recess with a square cross section having the same curvature as the upper and the outer circumference of the retainer, and a width equal to the retainer thickness, and having a groove having a square cross section having a width equal to the pocket height of the retainer at the center thereof ( The holder 141 is inserted into the holder support 144a of the holder 144 so as to be positioned horizontally, and the roller 143 is carried on the pocket part at the inner diameter side of the holder 141. Next, the arm 146 having the upper portion 145a of the support 145 fixed to the same frame as the support 144 is positioned above the center line of the flange of the retainer 141, perpendicular to the flange surface, The punch 147 fixed in the middle of the arm is fixed to contact the roller 143 described above. The tool fixed in this way is installed at a position where the other end 148 of the arm is in contact with the cylinder rod end punch 10 (see also part 7b) that extends from the air cylinder of the air-driven automatic roller assembly device and is supplied to the cylinder. The roller was assembled in the pocket using the principle of the lever by pressurizing by air pressure. Hereinafter, the above operation was repeated with respect to the other pockets in order to assemble the rollers one by one, and finally the rollers were assembled in all the pockets. In this case, the assembly speed was 0.2 m / sec, and the load was 60 kgf. In addition, the retainer 141 is shown in cross section.

15A and 15B show the annular tensile breaking load measured for the cylindrical roller bearing retainer deteriorated in oil (150 ° C.) and the change in the lapse of the annular tensile breaking elongation evaluated on the basis of the inner diameter, respectively.

Example (3-2-a) (GF = 20% by weight) and Example (3-2-b) (GF = 25% by weight) using the straight chain PPS resin composition, and the branched PPS resin composition Compared with Comparative Example (5-2-a) (GF = 20% by weight), the annular tensile breaking load (Fig. 15a) and the annular tensile breaking elongation (Fig. 15b) were both straight chain holders made of PPS resin composition. This is clearly excellent, the change is small over the whole area of the measurement, and the holder of the branched PPS resin composition has only a low level of performance close to the use limit. On the other hand, in the case of the comparative example (6-2-a) (GF = 20 weight%) and the comparative example (6-2-b) (GF = 25 weight%) using the general-purpose nylon 6,6 resin composition, a deterioration test At the previous point, it showed higher breaking load and elongation at break than retainer made of straight chain PPS resin composition. However, all of them decreased rapidly with deterioration time and deteriorated to the unusable level after 100 hours. . FIG. 16 shows the time course change in the weight change rate measured for the cylindrical roller bearing retainer deteriorated in air (170 ° C.) and oil (150 ° C.).

Example (3-1-a) using a straight chain PPS resin composition in any of the weight loss rate (degree 16a) in deterioration in air and the weight increase rate (degree 16b) in deterioration in oil (GF = 20 wt%), (3-1-b), (GF = 25 wt%), (3-2-a), (3-2-b) and Comparative Example using a branched PPS resin composition (5-1 In the case of -a) (GF = 20% by weight) and (5-2-a), it is very small, and shows good heat resistance and oil resistance. A comparative example using a general-purpose nylon 6,6 resin composition (6-1- a) In the case of (GF = 20% by weight), (6-1-b) (GF = 25% by weight), (6-2-a) and (6-2-b), the weight changes rapidly with time It shows that the heat resistance and oil resistance are inferior.

The result of the roller assembly test was written together to (Table 3).

In Example (3-1-a) and Example (3-1-b) using a straight chain PPS resin composition holder, Comparative Example (6-1-a) using a universal nylon 6,6 resin composition holder ) And Comparative Example (6-1-b), 100% success rate, no abnormality and automatic assembly of the roller was possible, whereas in Comparative Example (5-1-a) using a retainer made of branched PPS resin composition, At the time, the flange portion of the retainer was broken, and automatic assembly of the rollers was impossible at all.

The above test results are summarized in (Table 4). Table 4 shows FIGS. 8A, 8B, 9A, 9B, 10A, 10B, 12, 13A, 13B, 15A, 15B, and 15B. The result of FIG. 16A, FIG. 16B, and Table 1-Table 3 is synthesize | combined.

Retainers made of straight chain PPS resin compositions in Table 4 are in air (170˚C) and oil, regardless of whether they are retainers for conical roller bearings, retainers for spherical roller bearings, retainers for cylindrical roller bearings. The heat-resistant nylon 6, which is generally used in the mounting test of roller assembly, maintains a sufficient retainer titration throughout the entire test period, together with the annular tensile breaking load, the annular tensile breaking elongation rate, and the weight change rate after the deterioration test at (150 ° C). It was confirmed that automatic granulation was possible without a problem similarly to using a, 6 resin composition. On the other hand, in the case of the retainer made of the branched PPS resin composition, the heat resistance and oil resistance are good, but as shown by the fact that the breaker breakage occurs in the mounting test of the roller (except for the spherical roller bearing retainer having a loose perching value). It is fragile and the annular tensile elongation properties do not meet the level of performance used as retainer.

On the other hand, a retainer made of a heat-resistant nylon 6,6 resin composition has a superior performance than a straight chain PPS resin composition retainer at a point before the deterioration test. It was confirmed that the elongation rate was lowered and the weight was greatly changed, and the heat resistance and oil resistance were inferior, and after 100 to 200 hours, it was no longer subjected to deterioration exceeding the limit that can be used as a retainer.

As mentioned above, it can be said that the retainer which is the chain | strand-shaped PPS resin composition of this invention is a high performance retainer which can fully endure use even in severe use conditions, such as high temperature atmosphere and high temperature oil.

As mentioned above, although the retainer for conical roller bearings and the retainer for cylindrical roller bearings which were considered the most disadvantageous about the mounting test to a shape were tested as an Example, sufficient performance is also sufficient even when another retainer is manufactured with a straight chain PPS resin composition. It is clear from the above examples that the Therefore, the retainer of the present invention is a retainer for conical roller bearings, a retainer for spherical roller bearings, a retainer for cylindrical roller bearings, and a retainer for general ball bearings shown in FIG. The same applies to other retainers such as a retainer for crown-type ball bearings and a roller clutch retainer shown.

[Industry availability]

As described above, the present invention uses a straight chain PPS resin having excellent toughness, heat resistance, and oil resistance (chemical) resistance as a matrix resin as a base of the composition used for manufacturing a retainer in any of the configurations of the claims. It is possible to provide a retainer that can withstand long-term use in a high temperature atmosphere, in contact with oil or chemicals, in high-speed rotation conditions, or under high load conditions. Moreover, the retainer of this invention has the snap fit property required at the time of manufacture of a retainer, or a bearing assembly, and is fully equipped with other mechanical performance.

Claims (3)

It contains a straight chain polyphenylene sulfide resin having a melt viscosity of 700 poise or more when measured at 310 ° C at a shearing rate of 200 sec ¹ and a glass fiber in an amount of 0 to 45% by weight. A plastic retainer of a rolling element made of a straight chain polyphenylene sulfide resin, characterized in that. 2. The straight-chain polyphenylene sulfide according to claim 1, which is formed to be used as one of the conical roller bearing (F84) and the crown-shaped ball bearing (F92), and the glass fiber amount of the composition is 10 to 30% by weight. Plastic retainers for rolling elements made of resin. The method according to claim 1, wherein the spherical roller bearings (F85), cylindrical roller bearings (F86), needle bearings, roller clutches, and ball bearings are formed so as to be used, and the glass fiber amount of the composition is 10 to 45% by weight. A plastic retainer of rolling elements made of a straight chain polyphenylene sulfide resin.

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