JPH0332830Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention can be used satisfactorily even under severe usage conditions, for example, as support bearings for rolls in a plating tank installed in a continuous galvanizing line. The present invention relates to a self-aligning rolling bearing unit that can be used in such applications and has excellent heat resistance, corrosion resistance, and wear resistance, and can easily follow the deflection of a shaft.

[Prior Art] Conventionally known self-aligning rolling bearings have been made of bearing steel or stainless steel, so they are not sufficiently heat resistant and corrosion resistant, and they are also susceptible to oil,
When used in places where lubricating oils such as grease cannot be used, there are various problems that must be solved.

One way to solve these drawbacks and problems is to make the entire rolling bearing unit, including the housing, from ceramic.
Making the entire unit out of ceramic is extremely disadvantageous in terms of cost.

[Problems to be solved by the invention] This invention has excellent heat resistance, corrosion resistance, and wear resistance.
Another object of the present invention is to provide a self-aligning rolling bearing unit that does not necessarily require the use of special lubricating oil and is advantageous in terms of cost.

[Means for solving the problem] As stated in the first claim of the utility model registration, this invention is based on a method in which only the rolling bearing used in the bearing unit is made of ceramic, and the bearing is held. The sleeve and the housing holding the sleeve in a self-aligning manner are made of well-known materials (e.g. stainless steel), and at the same time the outer surfaces (exposed surfaces) of the sleeve and housing, including their mutually aligning surfaces, are A ceramic layer is formed by thermal spraying of ceramic.

[Function] Thus, in the self-aligning rolling bearing unit of this invention, regardless of the operating conditions, all the outer surfaces exposed to the surrounding atmosphere in which the unit is placed, including the alignment surface, are made of ceramic. Since it is covered and completely guarded, it has excellent heat resistance, corrosion resistance, and wear resistance, and has sufficient durability without using lubricating oil such as grease or oil.

[Example] Next, a typical example of the self-aligning rolling bearing unit of this invention shown in FIG. 1 will be described. 1 is a cylindrical roller bearing with an outer ring collar, which is one of the rolling bearings; 2 3 is a sleeve that holds the bearing 1 fixedly, and 3 is a housing that holds the sleeve in a centered manner.

The bearing 1 is entirely made of ceramic and consists of a cylindrical inner ring 11, an outer ring 12 with double flanges, and cylindrical rollers 4 arranged between the raceway surfaces of the two rings (a cage is used as necessary). ) The outer ring 12 may have an integrated flange, but in this embodiment, considering workability, cost, etc., the flange 121, 122 is formed on a flange ring formed separately from the raceway side ring. It is formed by twisting.

a sleeve 2 that holds the bearing 1 fixedly;
The outer circumferential surface of the sleeve is formed by a convex circular arc surface, and on both ends there are donut-shaped ring member flanges 21 and 22 formed separately from the sleeve body.
are integrally fixed via bolts, thereby positioning the bearing 1 in the axial direction.

The sleeve 2 has a ceramic layer 5 (the part shown in the drawing) formed by thermal spraying of ceramic on the entire outer surface (the entire exposed surface) including the convex arcuate surface.

The housing 3 includes the sleeve 2 in the drawing.
The sleeve 2 has a concave arcuate surface corresponding to the convex arcuate surface of the sleeve 2 so that it can slide along the convex arcuate surface of the sleeve 2, and its outer peripheral surface is hexagonal (not shown). (This external shape is appropriately determined in relation to the mating member to which the housing is fixed.) The housing 3 is coated with a ceramic layer by thermal spraying over the entire surface including the concave arc surface. 6 (portion indicated by ) is formed.

The thus formed rolling bearing 1, sleeve 2, and housing 3 are assembled in the mutual relationship shown in FIG. 1 to constitute the self-aligning rolling bearing unit of this invention.

[Effects of the invention] The self-aligning rolling bearing unit of this invention has the following effects:
Because of the above structure, even though the entire unit is not made of ceramic, it has excellent heat resistance, corrosion resistance, and wear resistance, and even when lubricating oil such as grease or oil is not used. It functions effectively and is suitable for mass production at low cost.

In particular, when the bearing unit of this invention is used as a roll bearing in a plating tank in a continuous lead plating line, the zinc in the tank will continuously adhere to the bearing unit and the support that supports the bearing unit. Since the removal of the bearing unit is not obstructed, it is easy to remove the bearing unit when replacing it, and work efficiency is improved.

In the embodiment, the sleeve collars 21 and 22 are formed by separate rings, but one collar may be formed integrally with the main body, and the other collar may be formed by a separate ring. Furthermore, although the ceramic layer of the sleeve 2 is formed on the outer surface except for the inner surface that is in contact with the outer ring 12 of the bearing, it may be formed on the entire surface.

Further, the type and detailed structure of the bearing are not limited to those in the embodiments, but may be modified as necessary.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of the self-aligning rolling bearing unit of this invention. In the symbols of the embodiments, 1 is a rolling bearing, 2 is a sleeve, 3 is a housing, 4 is a cylindrical roller bearing, 5, 6
is a ceramic layer.

Claims (1)

[Claims for Utility Model Registration] (1) The outer circumferential surface of a sleeve with double flanges that fixedly holds the rolling bearing has a convex arcuate surface, and the inner circumferential surface of the housing that holds the sleeve has the convex shape. In the self-aligning rolling bearing unit, the rolling bearing unit has a concave circular arc surface corresponding to the circular arc surface, and is assembled so as to be aligned between the two circular arc surfaces, wherein the rolling bearing is made of ceramic;
A self-aligning rolling bearing unit further comprising a ceramic layer formed by thermal spraying of ceramic on at least the exposed outer surface of the sleeve and the entire surface of the housing. (2) The self-aligning rolling bearing unit according to claim 1 of the utility model registration, wherein both ribs of the sleeve are donut-shaped rings. (3) The self-aligning rolling bearing unit according to claim 1 of the utility model registration claim, wherein one of the two flanges of the sleeve is integrally formed with the sleeve, and the other rib is a donut-shaped ring.