JPH028099Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to sliding bearings such as radial bearings that use ceramic materials or carbide materials as sliding members, which are used in rotating members such as pumps and fans. be.

[Prior art]

In conventional sliding bearings that use ceramic materials or carbide materials as sliding members (explained below using the example of radial bearings), the stationary sliding member is shrink-fitted to a metal shell, and the rotating sliding member is shrink-fitted to the main shaft. It is fixed with screws.

[Problem that the invention attempts to solve]

When such radial bearings are used under high-temperature conditions of, for example, 500°C or higher, the mechanical properties of the ceramics and cemented carbide themselves do not deteriorate;
The coefficient of linear expansion of ceramics and carbide materials is 1/3 to 1/6 of that of ordinary metal materials, so when used under high temperature conditions, the shrink fit of the stationary side sliding member with the metal shell loosens and cannot be fixed. Furthermore, there was a problem in that excessive stress was applied to the rotating sliding member, leading to damage. Therefore, it has conventionally been impossible to use such radial bearings at high temperatures of 500°C or higher.

The purpose of this invention is to eliminate these conventional drawbacks, and to provide a plain bearing that can be used even in high-temperature conditions of about 500°C to 1000°C, in a simple and inexpensive form. That is.

[Means to solve the problem]

The present invention provides a sliding bearing in which a stationary side sliding member provided on a bearing shell and a rotating side sliding member provided on a rotating shaft via a metal sleeve are made of ceramic material or carbide material. The number of divided pieces of the sliding member in the axial or circumferential direction is divided into a plurality of small pieces in both the axial direction and the circumferential direction, and each divided small piece is fixed to the bearing shell and the metal sleeve with a fixing means at intervals, respectively. Alternatively, the sliding bearing is characterized in that the rotating side and the stationary side have different sizes, and the stationary side sliding surface and the rotating side sliding surface are configured.

〔Example〕

To explain the present invention with reference to the embodiment of the radial bearing shown in FIGS. 1 to 3, the stationary side sliding member 10 provided in the bearing shell 2, which is a metal shell, has a part of the peripheral surface as shown in FIG. It is divided into a plurality of small pieces and fixed to the bearing shell 2 with fixing means, for example, a heat-resistant adhesive 12. Since the sliding member 10 is divided into small pieces, it is possible to prevent the bearing shell 2 from peeling off at high temperatures due to the difference in linear expansion coefficient between the ceramic or the carbide.

Further, a rotating side sliding member 13 provided on the rotating shaft 3
The metal sleeve 14 is also divided into a plurality of small pieces forming part of the circumferential surface, adhesively fixed to a metal sleeve 14 with a heat-resistant adhesive 12, and mounted on the rotating shaft 3.

These sliding members 10 and 13 are small pieces divided in the axial direction, circumferential direction, or both directions, and a plurality of these small pieces are arranged at a predetermined interval to form a sliding surface and have a heat dissipation effect. Consideration is given to improving the sliding characteristics of the bearing by making the number of divisions or size of the sliding member in the axial or circumferential direction different between the rotating side and the stationary side. Furthermore, the divided small pieces can be fixed at equal intervals, staggered, wavy, or along other reference lines, and the intervals can also be arbitrarily selected to have different sizes or to be connected. In these cases, this configuration is applied to both the stationary sliding member and the rotating sliding member, but it is also possible to use this configuration for at least one of them. In addition, it can be appropriately selected and adopted not only for radial shafts but also for thrust bearings and other sliding bearings with sliding surfaces. Further, when adhering the small pieces, it is also possible to form partition strips or recesses that protrude toward the object to be adhered, and to fit the small pieces therein and to fix the pieces.

The heat-resistant adhesive 12 is an inorganic adhesive mainly composed of ceramics, such as silica.
Composition mainly composed of alumina, viscosity 1000-4000
(cp/at25℃) If you use a high temperature adhesive with a linear expansion coefficient of 12×10 ^-6 (1/℃) and an adhesive strength of 80Kgf/cm ²
It does not deteriorate even under high temperature conditions of about 1000 degrees Celsius, and the sliding member is bonded to the rotating side or stationary side with a similar structure. Further, instead of the adhesive means used as the fixing means, it is also possible to fix with a holding member for fixing such as a metal frame or other supporting member.

In the figure, 4 is a blind flange, 5 is a case, 6 is a thrust receiving member, 7 is a housing, and 8 is a sleeve nut.

[Effect of idea]

In the present invention, the sliding member is divided into a plurality of small pieces in both the axial direction and the circumferential direction, and each divided small piece is fixed to the bearing shell and the metal sleeve with a fixing means at intervals. By configuring the stationary side sliding surface and the rotating side sliding surface by making the number of divisions or sizes of the sliding members in different directions on the rotating side and the stationary side, excessive stress on the rotating sliding part is avoided even during ultra-high-speed operation. This greatly improves the sliding properties of the bearing, and even under high-temperature conditions of 500°C to 1000°C, the shrink fit between the stationary side sliding member and the shell does not loosen, and the rotating side sliding member does not loosen. It has become possible to use the parts safely without damage, the durability has been significantly improved, the structure has been simple, and manufacturing has become inexpensive and simple.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the device in use, FIG. 2 is a partially enlarged longitudinal sectional view, and FIG. 3 is a sectional view taken along line AA in FIG. 2... Bearing shell, 3... Rotating shaft, 10... Stationary side sliding member, 12... Heat resistant adhesive, 13...
Rotating side sliding member, 14...metal sleeve.

Claims (1)

[Scope of utility model registration request] In a sliding bearing in which a stationary side sliding member provided on the bearing shell and a rotating side sliding member provided on the rotating shaft via a metal sleeve are made of ceramic material or carbide material, the sliding member is axially and circumferentially The divided pieces are divided into a plurality of pieces in both directions, and each divided piece is fixed to the bearing shell and the metal sleeve with a fixing means at intervals, so that the number or size of the sliding member in the axial direction or circumferential direction is determined. A sliding bearing characterized in that a rotating side and a stationary side are made different, and a stationary side sliding surface and a rotating side sliding surface are configured.