JPH09317763A - Sliding bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remarkable expansion of a preferable range of application by a method wherein a shock dampening characteristic of a shock absorbing material can be adjusted, a predetermined bearing performance is realized and held in a stable manner even against a variation of a loading condition or the like. SOLUTION: Shock absorbing material 2 such as rubber or the like for resiliently supporting a plurality of sliding pieces 1A of sliding member 1 of hard material such as ceramics or the like divided into some segments against an inner circumference of a cylindrical bearing housing 3 is comprised of a plurality of shock absorbing pieces 2A... in an axial direction and a circumferential direction. An adjusting mechanism comprised of female threaded holes 9... and adjustment operating pieces 10... threadably engaged with the female threaded holes is arranged at an outer diameter position of each of the shock absorbing pieces 2A... so as to enable their shock absorbing characteristic to be adjusted through increased or decreased compression force in a direction of diameter in respect to each of the shock absorbing pieces 2A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding bearing used for supporting a main shaft of various rotary machines such as a vertical shaft pump.

[0002]

2. Description of the Related Art In this type of sliding bearing, in order to prevent seizure of the sliding contact surface of the sliding member with the shaft during dry operation without lubrication, the sliding member is made of a hard material such as ceramics. Many are made of materials. As a slide bearing having a sliding member made of such a hard material, one generally known in the past is a sliding member 1 made of a hard material such as ceramics as shown in FIGS. 3 and 4. The cushioning material 2 made of rubber or the like is elastically held by a mold, and the cushioning material 2 is supported concentrically on the inner peripheral side of the cylindrical bearing housing 3, and the sliding member 1 and the cushioning material 2 are also provided. Annular pressing plate portion 4 that abuts on one axial end surface of the
Is integrally bent from one end of the bearing housing 3 in the axial direction, and an annular pressing plate 5 that comes into contact with the other end surfaces of the sliding member 1 and the cushioning member 2 in the axial direction is provided in the cylindrical bearing housing 3. It is fixed to the other end surface in the axial direction by bolting or the like, and the shock acting on the supported main shaft is absorbed by the cushioning material 2.

[0003]

In the conventional slide bearing having the above-mentioned structure, the cushioning characteristics of the cylindrical cushioning material 2, that is, the spring constant, the vibration damping coefficient, etc., are the characteristics of the rubber constituting the cushioning material 2. Since it is not possible to change or adjust the cushioning characteristics by adapting to load conditions etc., therefore, when used under conditions where the load etc. changes greatly, a sufficient cushioning function is exhibited. There is a problem that the suitable range of application of the sliding bearing itself is naturally restricted, such as that the cushioning material 2 does not elastically deteriorate in an early stage and cannot retain a predetermined bearing performance during long-term use. there were.

The present invention has been made in view of the above circumstances, and by making it possible to adjust the cushioning characteristics of the cushioning material, a predetermined bearing performance can be stably exhibited even with changes in load conditions and the like. It is also an object of the present invention to provide a plain bearing that can be held and greatly expand the suitable range of application.

[0005]

In order to achieve the above object, a slide bearing according to a first aspect of the present invention has a sliding member made of a hard material with a cushioning material interposed between them and an inner peripheral side of a cylindrical bearing housing. In the plain bearing supported by the above, the cushioning material is composed of a plurality of cushioning pieces at least in the circumferential direction, and the cushioning characteristics are adjusted at the radially outer positions of the cushioning pieces by increasing / decreasing the radial compression force. It is characterized by the provision of an adjustment mechanism that enables the adjustment.

According to the first aspect of the present invention having such a structure, the radial compression is performed on the plurality of cushioning pieces via the adjusting mechanism according to the load condition of the place where the slide bearing is used and the like. By increasing or decreasing the force, the cushioning characteristics of each cushioning piece can be adjusted as desired, and the cushioning characteristics can be adjusted by changing the material or size of each cushioning material, the number of installed pieces, etc. even after assembly. Is possible. As a result, it is possible to remarkably expand the suitable range of application of a type of sliding bearing, which is capable of stably exhibiting and maintaining a predetermined bearing performance even when the load condition or the like changes.

A slide bearing according to a second aspect of the present invention is the slide bearing according to the first aspect, wherein the sliding member comprises a plurality of sliding pieces divided into segments, Is provided corresponding to each of the plurality of segment-shaped sliding pieces, and according to the slide bearing having such a configuration, the cushioning characteristics of each of the sliding pieces divided into segments can be freely set. It is possible to make adjustments, to further improve the followability when applying a one-sided load, and to maintain a predetermined bearing performance stably even during long-term use under the operating condition of a one-sided load.

Further, by providing a plurality of the cushioning pieces and the adjusting mechanism not only in the circumferential direction but also in the axial direction as described in claim 3, the above-mentioned cushioning characteristics can be adjusted more delicately. Bearing performance can be further improved.

As a constituent material of the above-mentioned sliding member and a plurality of sliding pieces divided into segments, SiC and Si ₃ which are excellent in heat resistance and wear resistance from the viewpoint of preventing seizure during dry operation. Ceramics such as N ₄ are preferable, and rubber such as NBR is preferable as a constituent material of the buffer pieces.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical side view of a plain bearing according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1. In these figures, 1 is made of ceramics such as SiC or Si ₃ N _4. Hard sliding member, which is a plurality of sliding pieces 1 divided into segments in the circumferential direction.
A. Each of these sliding pieces 1A ... Is exposed to the plurality of bearing shells 6 divided into segments in the circumferential direction so that only the sliding contact surface 1a. The plurality of segment-shaped bearing pieces 8 ... Are formed in the circumferential direction by fitting and holding them.

Reference numeral 3 denotes a cylindrical bearing housing. The plurality of segment-shaped bearing pieces 8 ... Are arranged on the inner peripheral side of the bearing housing 3 so as to form a cylindrical shape, and the segment-shaped bearing pieces 8 ... An annular pressing plate portion 4 is integrally formed by bending from one axial end of the bearing housing 3 radially inward, and an annular pressing plate 5 fixed to the other axial end surface of the bearing housing 3 by bolting or the like. The bearing housing 3 is fixed and supported concentrically with the bearing housing 3 by being sandwiched and held from both sides in the axial direction.

Numeral 2 is a cushioning member made of rubber, two cushioning members 2A in the axial direction and a plurality of cushioning members 2A in the circumferential direction in each row.
Are interposed between the bearing shells 6 of the segment-shaped bearing pieces 8 and the bearing housing 3.
Internal threaded holes 9 ...
Are formed, and the adjusting operation pieces 10 screwed into the female screw holes 9 are moved forward and backward in the radial direction to increase or decrease the compressive force in the radial direction with respect to the buffer pieces 2A. The cushioning characteristics of the cushioning pieces 2A ... Can be adjusted. The female screw holes 9 ... And the adjusting operation piece 10
The adjusting mechanism is constituted by.

According to the plain bearing of the above construction, since the sliding pieces 1A of the sliding member 1 forming the sliding contact surface 1a with the shaft 7 are made of ceramics, they can be dry-operated without lubrication. Even if it does not cause seizure, the shaft 7
Even if a one-sided load is applied due to the inclination or bending of each segment-shaped bearing piece 8, the individual segment-shaped bearing pieces 8 ...
Since the cushioning pieces 2A ... Are absorbed, the bearing pieces are strong against a load per piece and always exhibit good bearing performance.

Further, according to the load condition of the place where the slide bearing is used, etc., the adjusting operation pieces 10 ... Constituting the adjusting mechanism are moved in the radial direction to compress the buffer pieces 1A. By increasing or decreasing the force, each buffer piece 1
It is possible to arbitrarily adjust the buffering characteristics of A ..., and the adjusting operation piece 10 ...
The material or size of each cushioning material 2A ...
It is possible to arbitrarily adjust the buffering characteristics by changing the number of installations or the like. As a result, the predetermined bearing performance can be stably exhibited and held even when the load conditions and the like change.

In the above embodiment, the sliding member 1 is divided into a plurality of sliding pieces 1A which are circumferentially divided into segments.
The configuration in which the plurality of segment-shaped bearing pieces 8 formed by fitting and holding a plurality of bearing shells 6 in a cylindrical shape are arranged has been described. The cylindrical sliding member 1 is a cylindrical bearing shell. It is also possible to apply the present invention to a plain bearing having a structure in which it is held by 6.

[0016]

As described above, according to the first aspect of the present invention, the radial direction with respect to the plurality of cushioning pieces is at least in the circumferential direction depending on the load condition of the place where the slide bearing is used. It is possible to adjust the cushioning characteristics of each cushioning piece by increasing / decreasing the compression force, and it is possible to adjust the cushioning characteristics by changing the material or size of each cushioning material, the number of installed pieces, etc. even after assembly. It is possible. Therefore, the predetermined bearing performance can be stably exhibited and maintained regardless of changes in the load conditions and the like. In other words, there is an effect that the suitable application range of a kind of slide bearing can be significantly expanded.

Further, according to the second aspect of the invention, it is possible to freely adjust the cushioning characteristics of each of the sliding pieces divided into segments, and to improve the follow-up performance when applying a one-sided load. The effect is further improved, and the predetermined bearing performance can be stably maintained even during long-term use under the operating condition of the load per piece.

Further, according to the third aspect of the present invention,
By providing a plurality of the cushioning pieces and the adjusting mechanism not only in the circumferential direction but also in the axial direction, it is possible to more finely adjust the above-mentioned cushioning characteristics and further improve the bearing performance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an embodiment of a slide bearing according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical sectional side view of a conventional slide bearing.

FIG. 4 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Sliding Member Made of Hard Material 1A Segmental Sliding Piece 2 Buffer Material 2A Buffer Piece 3 Bearing Housing 9 Female Screw Hole (Adjustment Mechanism Element) 10 Adjustment Operation Piece (Adjustment Mechanism Element)

Claims (3)

[Claims] 1. A slide bearing in which a sliding member made of a hard material is supported on the inner peripheral side of a cylindrical bearing housing via a cushioning material, wherein the cushioning material is composed of a plurality of cushioning pieces at least in the circumferential direction. In addition, the sliding bearing is characterized in that an adjusting mechanism capable of adjusting the cushioning characteristics by increasing / decreasing the compressive force in the radial direction is provided at the radially outer position of each cushioning piece. 2. The sliding member comprises a plurality of sliding pieces divided into segments, and the adjusting mechanism is provided corresponding to each of the plurality of segmented sliding pieces. Plain bearing. 3. The slide bearing according to claim 1, wherein a plurality of the buffer pieces and the adjusting mechanism are provided in the axial direction.