Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1997-05-08
1999-12-21
Knight, Anthony
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277549, 384484, C09K 310, F16J 1520, F16C 3378
Patent
active
060038764
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a sealing member such as a roller bearing seal, an oil seal or the like to be used in automotive components such as engines and related equipment, driving shafts, wheels, power steerings, etc., and household electrical appliance parts such as compressor rotary shafts etc., for instance, and to a sealed bearing having said sealing member.
BACKGROUND ART
As far as sealing members, such as roller bearing seals and oil seals, which are used in sealed bearings and the like to prevent the rotary shaft lubricating oil from leaking and for the like purposes are concerned, various contrivances have been made for their sealing property which is their primary function, and for maintaining its property. To roller bearing seals and oil seals for rotary shafts to be used in automotive components, household electrical appliance parts and the like, heat resistance enabling long-term service as well as durability and oil resistance at the surface of contact is essential in order that the sealing property may be maintained for a long time.
The roller bearing seals and oil seals which are used in the automotive engine and related equipment, e.g. the transmission, axles, etc., are generally maintained at 120 to 130.degree. C. while the automobiles are running. However, when the car stops because of a traffic congestion, for instance, the effect of air cooling diminishes, allowing the seal temperature to exceed 150.degree. C. at intervals. Therefore, heat resistance is an important requisite for assuring the mechanical strength. The water pump bearing seal, alternator bearing seal, wheel system seal, etc. are liable to be exposed to rain water (in some instances, salt water and muddy water), radiator water (LLC-containing water), etc., hence sufficient water resistance is essential.
In the case of bearing seals and oil seals to be used in the automotive transmission, transaxle, differentials and the like, not only functionally sufficient mechanical strength but also high heat resistance is required in order that they may serve the purpose continuously in the lubricating oil environment of 130 to 140.degree. C. at the maximum. Furthermore, a contrivance is required for preventing contaminants in the lubricating oil from entering the bearings and further for reducing seal lip abrasion due to the contaminants. Thus, in addition to said mechanical strength and heat resistance, good creep resistance (CS) is essential.
In the case of sealing members to be used in automotive power steerings and the like, still higher mechanical strength is essential for resisting the high internal pressure, in addition to the above-mentioned heat resistance.
In the case of bearing seals and oil seals to be used in the automotive crankshaft, cam shaft and the like, a low-aniline-point performance is essential for resisting the engine oil or fuel oil which has the property to swell rubber, in addition to the above-mentioned heat resistance.
In the case of the bearing seal or oil seal for the compressor as a component of the automotive air conditioner, household or office air conditioner, refrigerator or the like, those conventional machine oils for compressor use which are based on mineral oils are being switched over to a synthetic lubricating oil polyalkylene glycol (PAG), from the viewpoint of compatibility with a substitute fluorocarbon, which has recently been used as a heating medium in lieu of the fluorocarbon which tends to destroy the ozone layer. Thus, Japanese Kokai Publication Hei-3-160186 discloses a technology of improving compressors using PAG as the lubricating oil and Japanese Kokai Publication Hei-3-281688 discloses a technology of using PAG as a synthetic lubricating oil in the refrigerating machine. PAG may gasify (as a volatilized oil or a mist) during use. In that case, the gasified PAG and air come into simultaneous contact with the bearing seals or oil seals, so that it is essential that these have sufficient PAG resistance.
Meanwhile, nitrile rubbers (NBRs) having good oil re
REFERENCES:
patent: 3837660 (1974-09-01), Poggio
patent: 4167423 (1979-09-01), Williams
patent: 4988548 (1991-01-01), Takemura et al.
patent: 5171787 (1992-12-01), Zama et al.
patent: 5183613 (1993-02-01), Edwards
patent: 5208294 (1993-05-01), Brown
patent: 5282689 (1994-02-01), Imamura et al.
patent: 5383728 (1995-01-01), Micca et al.
patent: 5402858 (1995-04-01), Quantz et al.
patent: 5456327 (1995-10-01), Denton et al.
patent: 5565275 (1996-10-01), Schmidt et al.
patent: 5695198 (1997-12-01), Iwamoto et al.
Kuradome Shoji
Yamagishi Takahiro
Knight Anthony
Koyo Seiko Co. Ltd.
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