JP3126352B2 - Plain bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention has been formed by the lubricating composition mainly composed of Po Li polyphenylene sulfide resin synovial
It relates to bearings .

[0002]

2. Description of the Related Art In recent years, as the field of application of synthetic resin plain bearings has expanded, heat-resistant synthetic resin bearings that exhibit good friction and wear characteristics under bearing operating conditions, especially in a high-temperature atmosphere, have become stronger. It has come to be desired.

[0003] Also, inexpensive aluminum alloy A5056 and the like are used as a mating material of the bearing, and the characteristics of the bearing are required so as not to damage the mating material during use.

[0004] Conventionally, polyphenylene sulfide (P) has been used as a thermoplastic synthetic resin having good heat resistance and excellent mechanical strength.
It is well known that a resin is used.

However, since the PPS resin has poor self-lubricating properties, when used as a material for a portion requiring lubricating properties, it is necessary to separately impart lubricity by adding a lubricant or the like.

Therefore, such PPS resins include, for example, graphite, ethylene tetrafluoride resin, lubricating oil, metal oxide,
Composite materials to which an aromatic polyamide resin or the like has been added have been developed.

However, such composite materials are far from satisfactory in that they exhibit good friction and wear properties under high temperature and high load conditions. In addition, a composite material in which PPS resin is added with a synthetic resin powder having higher heat resistance than ethylene tetrafluoride resin and PPS resin has been developed. However, when the mating material is a hard material, it exhibits good friction and wear characteristics. However, when the partner material is an aluminum alloy, the partner material is damaged.

On the other hand, a composite material containing carbon fiber shows good friction and wear characteristics at an early stage, but damages the mating material even if the mating material is hard, and the friction and wear characteristics deteriorate rapidly with the damage.

[0009]

As described above, in the prior art, it is formed of a heat-resistant material having good lubricating properties.
There is a problem that it is not possible to cope with the demands of the public because there is no used plain bearing, and it has been a problem to solve this.

[0010]

In order to solve the above-mentioned problems, the present invention relates to a polyphenylene sulfide (PP)
S) Resin as a main component, 5 to 40 ethylene tetrafluoride resin
5% by weight of talc 5 with a scale of 0.1 to 100 μm
The present invention employs a means of forming a soft material formed of a resin composition containing 30% by weight of a resin composition as a sliding bearing for supporting a rotating shaft . The details are described below.

First, the PPS resin of the present invention has the general formula

[0012]

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A synthetic resin represented by the formula: Where -Ph-

[0014]

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Wherein Q is a halogen of F, Cl or Br or CH ₃ , and m represents an integer of 1 to 4. Of these, the most typical ones are

[0016]

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Which is commercially available from Philips Petroleum Corp. under the trademark "Ryton" and its production method is disclosed in US Pat. No. 3,354,129 (corresponding to Japanese Patent Publication No. 45-3368). according to it,
Ryton is 160 to 25 in N-methylpyrrolidone solvent.
It is produced by reacting p-dichlorobenzene with sodium disulfide at 0 ° C. under pressurized conditions, and has various degrees of polymerization from a resin having no cross-linking to a resin having partial cross-linking. Since the product can be freely produced through a post-heat treatment step, it is possible to arbitrarily select and use a product having an appropriate melt viscosity characteristic for a target solvent blend. In addition, a linear one without a crosslinked structure can be used.

In the present invention, the fluororesin may be ethylene tetrafluoride resin, ethylene-tetrafluoroethylene copolymer, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, Trichlorofluoroethylene and the like can be mentioned, and particularly preferred is tetrafluoroethylene resin.

The ethylene tetrafluoride resin is a polymer of ethylene tetrafluoride, and even if it is a powder for molding,
Further, it may be a fine powder for a so-called solid lubricant,
For example, Mitsui Dupont Fluorochemicals: Teflon
7J, TLP-10, manufactured by Asahi Glass Co., Ltd .: Fluon G163, manufactured by Daikin Industries, Ltd .: Polyflon M15, Lubron L5, and the like.

Further, talc in the present invention is a hydrous silicate of magnesium, preferably from scales flake. These particles have a particle size of 0.1 to 100 μm, preferably 0.5 to 60 μm.

In the present invention, the reason for limiting the amount of the fluororesin to 5 to 40% by weight is that if the amount is less than 5% by weight, the lubricating properties are poor, and if it exceeds 40% by weight, the moldability is remarkably deteriorated. is there. In addition, the amount of talc is 5 to 3
The reason for limiting the amount to 0% by weight is that the lubricating properties are poor outside this range and extremely weak when the amount exceeds 30% by weight.

Here, the method of mixing the additives having a fixed mixing ratio is not particularly limited, and a method generally used widely, for example, a resin as a main component and other various raw materials are individually Or Henschel mixer,
After appropriate dry mixing with a mixer such as a ball mill or tumbler mixer, supply it to an injection molding machine or melt extrusion molding machine with good melt mixing properties, or melt it in advance with a hot roll, kneader, Banbury mixer, melt extruder, etc. A method such as mixing may be used.

Further, the method of molding the composition of the present invention is not particularly limited, but may be a conventional method such as compression molding, extrusion molding, injection molding, or the like. Is crushed by a jet mill, a freeze crusher, or the like, and is classified into a desired particle size, or is not classified, and is subjected to fluid immersion coating using the obtained powder.
It is also possible to perform electrostatic powder coating or the like. Further, it is also possible to disperse the obtained powder in a solvent and perform spray coating or dip coating.

Various additives may be added to the lubricating composition containing the PPS resin of the present invention as a main component within a range that does not deteriorate the lubricating properties. In addition, in order to further improve lubricity, various wear resistance improvers may be blended.

Preferred examples of such abrasion resistance improver include, but are not limited to, aromatic polyamide fibers, graphite, aromatic polyester resins and the like.

[0026]

The sliding bearing made of the composition of the present invention described above forms a good transition film on a mating material even in a high-temperature atmosphere by using a fluororesin and talc as essential components. Even if the material is an aluminum alloy, it shows good lubrication properties without being damaged.

[0027]

EXAMPLES First, the raw materials used in the examples and comparative examples are collectively shown as follows. The mixing ratio of each component is all% by weight.

PPS resin (manufactured by Tosoh Steel Co., Ltd .:
PPS # 160) PPS resin (Kureha Chemical Co., Ltd .: KPS-W205) Talc A (Matsumura Sangyo Co., Ltd .: Crown Talc PP, scale) Talc B (Fuji Talc Kogyo Co., Ltd .: Talc RF-B, fibrous) Fluorinated ethylene resin A (manufactured by Mitsui DuPont Fluorochemicals: Teflon 7J) Tetrafluoroethylene resin B (manufactured by Kitamura: KT300M, calcined powder) Aromatic polyester resin (manufactured by Sumitomo Chemical Co., Ltd .: Econol E101M) Carbon black ( Lion Corporation: Ketchen EC-
X) Graphite (Nippon Graphite, ACP).

Examples 1-3 : Various raw materials were blended at the ratios shown in Table 1. In molding the composition, first, the raw materials are thoroughly mixed with a Henschel mixer, supplied to a twin-screw extruder, and extruded under a melt mixing condition of a cylinder temperature of 300 ° C. and a rotation speed of 100 revolutions per minute, and granulated. Resin temperature 310 ° C., the pellets
A ring-shaped test piece having an outer diameter of 35 mm, an inner diameter of 25 mm, and a width of 6 mm was molded under injection molding conditions of an injection pressure of 800 kg / cm ² and a mold temperature of 140 ° C., and using this test piece, a high-temperature radial friction and wear test described below was performed. Was performed.

<High temperature radial friction and wear test>
An aluminum alloy (A5056) cylindrical mating member is fitted on the outer periphery of a coaxial shaft on a rotating shaft driven in an atmosphere of 200 ° C. Against a pressure of 2.7 kgf / cm ² , a torque meter is attached to the rotating shaft, and after continuous rotation for 168 hours so that the peripheral speed is 3 m / min, the wear amount (mg) of the test piece, Measure the torque (kgf · cm) of the rotating shaft,
And the damage degree of the partner material was observed. The degree of damage was represented by a three-point scale of not damaging (marked with ○), slightly damaged (marked with △), or damaged (marked with ×). The results obtained are summarized in Table 2.

[0031]

[Table 1]

[0032]

[Table 2]

Comparative Examples 1 to 6 : Specimens were prepared in exactly the same manner as in Example 1 except that the raw materials were blended in the proportions shown in Table 1, and various characteristics were obtained. It was also described in.

From the results shown in Table 2, in Comparative Examples 1 to 5, the amount of wear and the rotational torque were all large.
In Comparative Examples 1, 2, and 5, damage to the mating member was large.
On the other hand, in Examples 1 to 4, it was clarified that both the wear amount and the rotation torque were small, and that the aluminum alloy as the mating material was not damaged.

[0035]

As described above, the resin composition of the present invention
Sliding bearing comprising a molded body of the object has an excellent wear resistance even in soft material partner such as an aluminum alloy, and since no damage to the mating member, Te <br/> a sliding bearing agnostic counterpart material Can be used.

Further, since the heat resistance of the PPS resin is utilized, it can be said that the PPS resin is suitable for applications requiring wear resistance against a soft material under high temperature conditions.

Also, the sliding made of the resin composition of the present invention
Since the bearing can be easily formed by injection molding, it can be said that the significance of the present invention is extremely large.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI C10N 30:00 30:06 40:02 50:08 (58) Investigated field (Int.Cl. ⁷ , DB name) C10M 107 / 38 C10M 107/46 C10M 125/26 C10N 10:04 C10N 30:06 C10N 40:02 C10N 50:08

Claims (2)

(57) [Claims] 1. A scaly composition comprising a polyphenylene sulfide resin as a main component and 5 to 40% by weight of an ethylene tetrafluoride resin.
A soft resin molded article of a resin composition to which 5 to 30% by weight of talc having a particle size of 0.1 to 100 μm is added as an essential component
Bearings for supporting the rotating shaft of materials . 2. The sliding bearing for supporting a rotating shaft of a soft material according to claim 1, wherein the soft material is an aluminum alloy.