JPS58113629A - Rolling bearing - Google Patents

Abstract

PURPOSE:To obtain durability, a load resistance and high lubrication by using both silver and lead as a solid lubricant in a vacuum rolling bearing in which a soft metal coating is applied on the rolling contact surface as a solid lubricant. CONSTITUTION:With regard to rolling elements 3 composed of steel balls or the like present between an inner and outer ring 1, 2, a silver coating film 4 is applied on the surface of some of said rolling elements 3 and a lead coating film 5 is applied on the other rolling elements 3 and both elements 3 are disposed alternately. The rate is determined due to the vacuum atmosphere to be used or an X-ray device, while the silver coating, which is excellent in a heat resistance, durability and a load resistance, and the lead coating, which is excellent in lubrication and lowers the bearing torque, are combined efficiently. Accordingly, the combination due to the use can give appropriate durability, load resistance and lubrication. Further, thesilver coating film may be applied on either one of the track surfaces of said inner and outer ring 1a, 2a and the lead coating film 5, on the other one.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller bearing, particularly an oil-free roller bearing suitable for use in a vacuum.

It is well known that a single solid lubricant is used in bearings used in vacuum or high-temperature environments where oil or grease cannot be used, and a single soft metal such as gold, silver, or lead is used as the solid lubricant. is used. (For example, Special Publication No. 53-2145
(Refer to Publication No. 9) Silver has a higher melting point than lead and is superior in heat resistance and load resistance, but it is harder than lead and therefore has inferior lubricity. Therefore, if heat resistance, durability, and load-bearing properties are important, silver is used, but this has a high bearing torque.
If lubricity and low torque are required, lead should not be used at the cost of sacrificing lubrication performance, heat resistance, durability, and load carrying capacity.

As mentioned above, silver and lead each have their advantages and disadvantages, and as a result of using all that can be used to achieve their respective purposes, production volumes are low and costs are high.

This invention skillfully utilizes the properties of silver and lead to improve heat resistance, durability, and load capacity in roller bearings used in vacuum environments, especially roller bearings that use soft metal as a solid lubricant. The purpose of this invention is to provide a bearing with rollers that has high performance, improved lubrication performance, and low torque, and is suitable for mass production.

To explain the example, 1st v! In J, some of the rolling elements 3, such as steel balls, interposed between the raceway surface 1a of the inner ring 1 and the raceway surface 2& of the outer ring 2 are coated with copper! !
X4 is applied, and a lead coating Sf is applied to the surface of the other rolling elements, and these are arranged alternately. Alternatively, as shown in FIG. 6, a rolling element 3A1kld without the coating 4.5 may be placed between the rolling elements 3 coated with the silver coating 4 and the lead coating 5t. This kind of copper cover II! 4. The ratio of the number of rolling elements coated with lead coating 5, that is, the number of incorporated elements, is preferably determined as appropriate depending on the vacuum atmosphere, high temperature, or X-ray equipment in which the bearing is used. Furthermore, the rolling elements are not limited to steel balls, but may also be of any shape such as cylindrical rollers, tapered rollers, spherical rollers, needle rollers, and others.

As a method for applying the silver coating 4 and lead coating 5 to the surface of the rolling element, any method such as coating, plating, or ion blating can be used. As shown in Figure 2, between silver and lead and the rolling element material covered with them,
One or more types of metal materials having higher solubility in each other between silver, lead and the rolling element material than the metal solubility between silver, ship and the rolling element material (for example, applying nickel coating to the surface of the rolling element, Copper coating is applied on top of that, part 1
It is preferable to interpose a coating such as a silver coating on one surface.

1.) The silver and lead coating @4.5 is the rolling element 3 as shown in Figure 2.
It is also possible to have a multi-layered structure in which a lead coating 4 is first applied to the surface of the outer ring 1, and then a lead coating 5 is applied to the surface thereof.As shown in FIG. Lead coating 5
A silver coating 4t may be applied to the raceway surface 2a of the outer ring 2, or vice versa, a silver coating may be applied to the inner ring side and a lead coating to the outer ring side. Either coating may be applied to either or both of the inner and outer ring raceway surfaces.

Furthermore, it is also effective to make the coating on either or both of the inner and outer ring raceway surfaces to have a multilayer structure in which lead is layered on top of silver.
As shown in the figure, both the inner and outer ring raceways [11 & 12 &
A silver coating 4 that is continuous in the circumferential direction is applied to one part, and a lead coating 5 that is continuous in the circumferential direction is applied to the other part, and between the two coatings or on both sides. , a raceway surface (not shown) to which the bearing material forming the inner and outer rings is exposed may be formed, as shown in FIG.
Copper coating @4 and lead coating 5 may be applied alternately in the circumferential direction0
The ratio of the copper coating 4 and the lead coating 5 to the raceway surface area can be appropriately determined depending on the location, atmosphere, etc. where the bearing O is used, as described above.

As described above, this invention provides both a silver coating and a lead coating on one or both of the rolling element surface and raceway surface, that is, at least one of the roller contact surfaces between the rolling element and the inner and outer rings.・As the rollers rotate in the bearing, silver and lead simultaneously act as a body temperature lubricant. As mentioned above, silver has excellent heat resistance, durability, and load-bearing properties, and it is superior to lead II.
'1lII Since it has excellent lubricity and has the effect of lowering bearing torque, silver compensates for the heat resistance, durability, and load resistance that lead lacks, and prevents early peeling and wear of lead. Guarantees insufficient lubricity and reduces bearing torque.

Therefore, by skillfully combining the silver coating and the lead coating and determining their usage ratio, it is possible to provide an oil-free rolling bearing with excellent durability, load carrying capacity, and lubricity depending on the application. Its mass production is possible and costs can be reduced.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the main part of the embodiment, Figures 2, 3, and 4.
The figures are longitudinal sectional views of main parts of other embodiments, Fig. 5, and Fig. 6, respectively.
Each figure is a horizontal 11T view showing the main parts of other embodiments. l... Inner ring, 2... Outer ring, 1m, 2m... Raceway surface, 3゜3mm... Rolling element, 4... Silver coating, 5... Lead coating Figure 1 Figure 2 Figure 3 Figure 5

Claims (1)

[Scope of Claims] (1) A bearing having nine vacuum rollers in which at least one of the contact surfaces of the rollers is coated with a soft metal coating as a solid lubricant, wherein both silver and lead are used as the solid lubricant. (2) A roller bearing characterized by using a soft metal sheath.
Scope of patent claim (rolling bearing described in 11 (3) Patent incorporating rolling elements coated with silver and rolling elements coated with lead in an appropriate arrangement) in which the contact surface is the surface of the rolling element Claim (1) or Fi (rolling bearing described in 21) (
4) The rollers described in claim 11 or (2) are bearings in which a silver coating and a lead coating are layered on the surface of the rolling element (5) The rolling element is coated with a soft metal coating, and the coating is coated with the coating. Claims that incorporate rolling elements that are not provided in an appropriate arrangement (
The rolling bearing (6) according to any one of Items 11 to (4), wherein the ratio of the number of rolling elements coated with a soft metal coating to the number of rolling elements not coated with the coating is appropriately determined ( 5)
A rolling bearing (8) according to claim (1), in which the rollers described above are a multi-roller bearing (7) and the rollers coated with a soft metal have a contact surface as at least one of the raceway surfaces of rolling elements provided on the inner and outer rings. A rolling bearing (9) according to claim 11 or (7) in which one of the inner ring raceway surface and the outer ring raceway surface is coated with silver and the other is coated with lead. Claim +11 in which the coating is applied in an overlapping manner, or (the rollers described in force are P-bearing a, a silver coating is applied to a part of the raceway surface on which the soft metal coating is applied,
Claim (1) or (
7) Bearing with multiple rollers as described I A rolling bearing with a soft metal coating and a nine-track bearing with an appropriately determined ratio of the raceway surface portion on which a silver coating is applied and the raceway surface area on which a lead coating is applied. A roller bearing according to any one of claims (7) to (2) having a surface portion and a raceway surface portion not coated with the coating (2) any one of a rolling element surface and a raceway surface. Patent claim IH1 (the roller described in 11) has a silver coating on one side and a lead coating on the other. ) The rolling bearing described in Claim (2) or α