JP2002221230A - Rolling bearing for vacuum circuit-breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent locking of a rolling bearing caused by a lump of a peeled coating film at a contact of an inner ring, outer ring and rolling body. SOLUTION: The rolling bearing for a vacuum circuit-breaker comprises the inner ring 30, the outer ring 31 and the rolling body 33 interposed between the inner and outer rings, and also characterized in that molybdenum disulfide using an inorganic binder is coated 34 at least onto raceways 30a, 31a of the inner ring 30 and the outer ring 31, and/or onto the rolling body 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing which is used in a vacuum circuit breaker and performs oscillating motion.

[0002]

2. Description of the Related Art Conventionally, a vacuum circuit breaker that operates as a breaker when an overcurrent occurs in a substation or a factory has a shaft having an arm with a spring, an electrode, or an electromagnet, and swings during operation. Rolling bearings, for example, needle roller bearings, are used for the portions supporting the shaft and the attached link mechanism. Fluorine-based grease is used as a lubricant for the needle roller bearing. In recent years, demand for oil-less due to long-term maintenance-free has increased, and various oil-less bearings have been proposed.

Among them, there is known a needle roller bearing in which a needle lubricant transfer surface of an inner ring and an outer ring is coated with a solid lubricant made of molybdenum disulfide using an organic binder. Examples of the organic binder include synthetic resins such as an epoxy resin, a phenol resin, an acrylic resin, a polyphenylene sulfide, an alkyd resin, a polyimide, a polyamideimide, and a fluororesin. Since the coating film of molybdenum disulfide using the above-mentioned organic binder is an organic polymer, it has high adhesion to the inner ring and outer ring base materials and a high bonding property inside the coating film, and has excellent corrosion resistance and abrasion resistance. ing.

[0004]

The conventional rolling bearing for a vacuum circuit breaker described above is coated with a solid lubricant made of molybdenum disulfide using an organic binder, so that it has excellent corrosion resistance and wear resistance. Although there is no problem in this point, this property is a problem because the adhesion to the inner ring and the outer ring base material and the bonding property inside the coating film are high. That is, in the vacuum circuit breaker, when the overcurrent occurs, the bearing operates within a fixed small swing angle and the speed (acceleration) at the time of the operation is high, so that the bearing contacts the rolling element of the inner ring or the outer ring. Molybdenum disulfide at the location may come off at the contact part with the rolling element, but as described above, it does not come off easily from the inner ring and the outer ring due to high adhesion and bonding properties, and it remains at the contact part and eventually becomes large. There is a problem that the bearings are locked and locked.

Accordingly, an object of the present invention is to prevent the rolling bearing from being locked due to the solidification due to the peeling of the coating film on the inner ring and the outer ring.

[0006]

As a means for solving the above problems, a rolling bearing for a vacuum circuit breaker comprising an inner ring, an outer ring, and a rolling element interposed between the inner and outer rings, comprising: an inner ring; At least the raceway surface of the outer ring and / or the rolling element surface is coated with molybdenum disulfide using an inorganic binder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to FIGS. Figure 1
1 is a schematic view of a vacuum circuit breaker using a rolling bearing of the present invention. A cam lever 1 having a cam surface 1a formed at one end is swingably supported on a fixed shaft 2 via a needle roller bearing 3, and a joint 1b at the other end is pulled by a spring 4 so as to face the electromagnet 5. I have. In addition, a plate-like electrode 7 that exerts a force in the opening direction is provided in the current circuit 6. And this electrode 7
The both ends of the shaft 8 formed with the pressing lever 8a for pressing the current as the current circuit 6 against the force in the opening direction are formed by the needle rollers fitted into the housing 10 fixed to the fixing member 9. A cam plate 11 is provided on a swingable shaft 8 via a bearing 3. A cam plate 11 is provided on one end of the cam plate 11, and a cam surface 1 a of the cam lever 1 is provided on a pin 12 formed at one end of the cam plate 11. Are detachably engaged. Also,
The cam plate 11 is pulled by a spring 13 in a direction in which the pressing lever 8 a is separated from the electrode 7.

Therefore, in the vacuum circuit breaker shown in FIG. 1, when an overcurrent flows in the current circuit 6, the electromagnet 5 acts and the cam lever 1 overcomes the force of the spring 4 and is pulled toward the electromagnet 5, so that the cam of the cam lever 1 The surface 1a is the pin 12 of the cam plate 11
Get off. Then, the cam plate 11 is instantaneously pulled by the spring 13 to separate the pressing lever 8a from the electrode 7,
One end of the electrode 7 is opened from the current circuit 6, and the current is cut off. As described above, when an overcurrent flows in the vacuum circuit breaker, the current is instantaneously cut off, but thereafter, the state is returned to the initial state again. In the vacuum circuit breaker, the above operation is repeated. And a needle roller bearing 3 for supporting the shafts 2 and 8 above.
Means that the swinging is repeated at a small angle by repeating the current interruption and energization of the vacuum circuit breaker.

As shown in FIG. 2, the needle roller bearing 3 has an inner ring 30, an outer ring 31, and a needle roller 33 interposed between the inner and outer rings 30, 31 and held by a retainer 32. are doing. The entire surface of the inner ring 30 and the outer ring 31 is coated with a solid lubricant made of molybdenum disulfide using an inorganic binder. As the solid lubricant, for example, trade name “Defric Coat 405” (trade name)
Kawamura Laboratory). In addition, examples of the inorganic binder include silicate, phosphate, borax, and the like.
Inner ring 3 compared to those using conventional organic binders
0 and the degree of adhesion of the outer ring 31 to the base material and the coating 3
4 The bondability inside the coating can be reduced. Furthermore, abrasion resistance and corrosion resistance can be maintained, and no outgassing occurs in a vacuum.

The coating 34 is applied to the entire surface of the inner ring 30 and the outer ring 31.
Is advantageous in terms of corrosion resistance when it is formed from bearing steel, but when it is not necessary to consider corrosion resistance so much, at least the raceway surfaces 30a and 31a have a coating 3 on them.
4 can be applied. When the inner race 30 and the outer race 31 are made of stainless steel such as SUS440C, for example, the raceway surface 3 of the inner race 30 and the outer race 31 has corrosion resistance.
Coating 34 may be applied to 0a and 31a, but coating 34 may be applied to all surfaces of inner ring 30 and outer ring 31 in order to further improve corrosion resistance. Furthermore, when the inner ring 30 and the outer ring 31 are made of bearing steel, the coating 34 of molybdenum disulfide can be easily performed by performing a base treatment by a phosphate treatment. The retainer 32 may be made of carbon steel or stainless steel. In the case of carbon steel, if nitrocarburizing treatment is performed, corrosion resistance and wear resistance are improved.

The needle roller bearing 3 has the above configuration,
The bearing 3 oscillates with the operation of the vacuum circuit breaker. By forming the coating 34 of molybdenum disulfide using an inorganic binder, the adhesion of the coating 34 to the inner ring 30 and the outer ring 31 and the coating 34 are obtained.
The needle rollers 33
Even if the coating 34 may come off at the contact portion with the needle roller bearing 3, the coating is not easily removed from the contact portion and the coating does not clump at the contact portion.
No rocking lock occurs.

In the embodiment, the needle roller bearing 3 has been described. However, the present invention is also applicable to a roller bearing such as a cylindrical roller bearing or a ball bearing such as a deep groove ball bearing or an angular ball bearing.

The coating 34 is applied to at least the raceway surfaces of the inner race 30 and the outer race 31, but may be further applied to the rolling elements (in the embodiment, the needle rollers 33). In the case where the coating 34 is applied to the rolling element surface, the coating 34 on the inner ring 30 and the outer ring 31 may be omitted if necessary.

[0014]

As described above, according to the present invention, there is provided a rolling bearing for a vacuum circuit breaker having an inner ring, an outer ring, and a rolling element interposed between the inner and outer rings, wherein at least raceway surfaces of the inner ring and the outer ring are provided. And / or the rolling element surface is coated with molybdenum disulfide using an inorganic binder, so that even if the coating may be peeled off at the contact portion between the raceway surfaces of the inner ring and the outer ring and the rolling element, Since the film is not removed from the contact portion and the film does not clump at the contact portion, the rocking of the rolling bearing does not occur.

[Brief description of the drawings]

FIG. 1 is a schematic view of a vacuum circuit breaker of the present invention.

FIG. 2 is a sectional view of a rolling bearing in the vacuum circuit breaker of the present invention.

[Explanation of symbols]

 3 Needle Roller Bearing 30 Inner Ring 31 Outer Ring 32 Cage 33 Needle Roller 34 Coating

Claims (1)

[Claims] 1. A rolling bearing comprising an inner ring, an outer ring, and a rolling element interposed between the inner and outer rings, wherein an inorganic binder is provided on at least the raceway surfaces of the inner ring and the outer ring, and / or on the rolling element surface. A rolling bearing for a vacuum circuit breaker, characterized by being coated with molybdenum disulfide.