JP3688794B2 - Manufacturing method of solid lubricant sealed bearing - Google Patents

Description

【００１６】
【発明の効果】
この発明によれば、潤滑油に、高分子量ポリオレフィン粉末又は超高分子量ポリオレフィン粉末を混合したものを半固形状態で軸受内に注入し、その後加熱固化したので、固化前の潤滑剤を容易に軸受内に保持できるようになり、また注入された半固形状の潤滑剤は、軸受より漏れないので、製造工程を簡略化でき、注入作業も容易になる。また、上記混合物はグリース状なので、軸受内に種々の形状で注入できる利点もある。
【図面の簡単な説明】
【図１】（ａ）実施例で製造した固形潤滑剤封入軸受の平面図
（ｂ）（ａ）の一部拡大断面図
【図２】（ａ）実施例で製造した他の固形潤滑剤封入軸受の平面図
（ｂ）（ａ）の一部拡大断面図
【符号の説明】
１ 内輪
２ 外輪
３ 保持器
４ リベット
５ 固形潤滑剤
６ 転動体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a solid lubricant sealed bearing in which a solid lubricant is sealed in a bearing such as a rolling bearing.
[0002]
[Prior art]
Conventionally, as solid lubricants made of lubricating oil and polyethylene used for bearings, US Pat. No. 3,541,011, US Pat. No. 3,547,819, US Pat. No. 3,729,415, etc. Is disclosed.
[0003]
[Problems to be solved by the invention]
However, since the lubricant using polyethylene powder as the lubricating oil is a solid-liquid mixture at the mixing stage, it leaks from the bearing in the manufacturing process of injecting the lubricant into the bearing. There is a problem that the manufacturing process becomes complicated.
[0004]
Accordingly, an object of the present invention is to solve the above-described problems and provide a manufacturing method in which a lubricant before solidification can be easily held in a bearing in a manufacturing method of a bearing in which a solid lubricant is enclosed.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a mixture of lubricating oil and high molecular weight polyolefin powder or ultrahigh molecular weight polyolefin powder is heated to 90 to 120 ° C. to be semi-solid, and this is injected into the bearing. In this state, a method for producing a solid lubricant-enclosed bearing is adopted, in which the polymer is heated to a temperature equal to or higher than the gel point of the high molecular weight polyolefin or ultrahigh molecular weight polyolefin, and then cooled and solidified.
[0006]
A mixture of high molecular weight polyolefin powder or ultrahigh molecular weight polyolefin powder mixed with lubricating oil was heated to 90 to 120 ° C., so that this mixture became grease-like and easy to inject into the bearing. Less leaks.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
The high molecular weight polyolefin powder or ultrahigh molecular weight polyolefin powder in the present invention may be a powder comprising a high molecular weight body or ultrahigh molecular weight body of polyethylene, polypropylene, or polybutene, or a high molecular weight body or ultrahigh molecular weight body of these copolymers. . The weight average molecular weight measured by the viscosity method is 1 × 10 ⁵ to 1 × 10 ^{6 for} the high molecular weight material, and 1 × 10 ^{6 to} 5 × 10 ⁶ for the ultra high molecular weight material. A polyolefin having such a weight average molecular weight is excellent in rigidity and oil retention, and hardly flows even when heated to a high temperature. As a commercial product of such ultra-high molecular weight polyolefin powder, Miteron Petrochemical Co., Ltd. Miperon can be used.
[0008]
In addition, various lubricating oils can be used as the lubricating oil in the present invention, for example, mineral oil, synthetic hydrocarbon oil, polyalkyl glycol oil, diester oil, polyol ester oil, phosphate ester oil, polyphenyl ether oil. Etc.
[0009]
The blending ratio of the high molecular weight polyolefin powder or the ultrahigh molecular weight polyolefin powder in the solid lubricant in the present invention is not particularly limited, but is preferably 95 to 5% by weight, and the solid lubricant composition is within this range. The amount of oil can be increased or decreased in accordance with the required degree of oil separation, tenacity and hardness. However, as the amount of the high molecular weight polyolefin or the ultra high molecular weight polyolefin increases, the hardness of the gel after being heated to a temperature equal to or higher than the gel point and then cooled and solidified increases.
[0010]
In the method for producing a solid lubricant injection bearing according to the present invention, the lubricating oil and the high molecular weight polyolefin powder or ultrahigh molecular weight polyolefin powder are mixed to form a solid-liquid suspension, and heated to 90 to 120 ° C. in this state. . By this heating, the lubricating oil is subjected to a thickening action of the polyolefin powder, and the above mixture becomes a semi-solid state, that is, a grease state.
[0011]
Next, the mixture is poured into the bearing while maintaining a grease state while maintaining the temperature at 90 to 120 ° C. For example, as shown in FIGS. 1 (a) and 1 (b), the injection method is such that a cage 3 composed of two strips is overlapped and fixed between rivets 4 between an inner ring 1 and an outer ring 2 of the bearing. As shown in FIGS. 2A and 2B, the entire portion between the inner ring 1 and the outer ring 2 of the bearing is filled in a so-called full pack shape. Things can be raised.
[0012]
When the grease-like mixture is injected, the mixture is semi-solid and does not flow out of the bearing without a sealing device. Therefore, the entire bearing in this state is heated to a temperature equal to or higher than the temperature at which the high molecular weight polyolefin powder or the ultrahigh molecular weight polyolefin powder causes gelation, and then cooled and solidified to solidify the grease-like material. Thus, a solid lubricant encapsulated bearing is manufactured.
[0013]
【Example】
[Examples 1-7]
Using ultra-high molecular weight polyolefin (weight average molecular weight 2 million, manufactured by Mitsui Petrochemical Co., Ltd .: Mipperon) and each lubricating oil listed in Table 1 as raw materials, they were mixed at room temperature at the blending ratio (% by weight) shown in Table 1, and then Heated to 100 ° C. with continued mixing. After the mixture became grease-like, it was poured into a radial ball bearing (NTN Corp .: 6204) in a spot pack shape shown in FIG. 1 or a full pack shape shown in FIG. Then, the bearing which heated to 170 degreeC and cooled and solidified the mixture was manufactured.
[0014]
[Comparative Examples 1-6]
Radial ball bearings by mixing ultra-high molecular weight polyolefin (weight average molecular weight 2 million, manufactured by Mitsui Petrochemical Co., Ltd .: Mipperon) and each lubricating oil listed in Table 1 at the blending ratio (% by weight) shown in Table 1. (NTN Co., Ltd .: 6204) tried to be injected into the spot pack shape shown in FIG. 1 or the full pack shape shown in FIG. However, the mixture leaked and could not be injected into the bearing, and a bearing into which a solid lubricant was injected could not be manufactured.
[0015]
[Table 1]

[0016]
【The invention's effect】
According to the present invention, a mixture of high-molecular-weight polyolefin powder or ultra-high-molecular-weight polyolefin powder mixed with lubricating oil is injected into the bearing in a semi-solid state and then heated and solidified. The semi-solid lubricant that has been injected can be prevented from leaking from the bearing, so that the manufacturing process can be simplified and the injection operation can be facilitated. Further, since the mixture is in the form of grease, there is an advantage that it can be injected into the bearing in various shapes.
[Brief description of the drawings]
1A is a plan view of a solid lubricant encapsulated bearing manufactured in an embodiment. FIG. 1B is a partially enlarged cross-sectional view of FIG. 2A. FIG. 2A is another solid lubricant encapsulated in an embodiment. Plan view of bearing (b) Partial enlarged sectional view of (a) [Explanation of symbols]
1 Inner ring 2 Outer ring 3 Cage 4 Rivet 5 Solid lubricant 6 Rolling element

Claims (1)

Lubricating oil and semi by heating a mixture of polyolefin powder of polyolefin powder or a weight average molecular weight of weight average molecular weight of 1 × 10 ⁵ ~1 × 10 ⁶ is 1 × 10 ⁶ ~5 × 10 ⁶ to 90 to 120 ° C. solid was Joka, which was injected into the bearing without a sealing device, then the entire bearing, polyolefin or weight-average molecular weight of weight average molecular weight of above 1 × 10 ⁵ to 1 × 10 ⁶ of 1 × 10 ^A method for producing a solid lubricant-enclosed bearing comprising heating to a temperature equal to or higher than the gelling point of ^{6 to} 5 × 10 ⁶ polyolefin, followed by cooling and solidification.

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