JPH07103188A - Thrust bearing unit - Google Patents

Abstract

PURPOSE:To provide a thrust bearing unit where there is no fallout of a bearing from a cushioning material even if it is shifted in the vertical direction against an axial center and also no damage in contact with a bearing supporting member on the bearing circumference, by installing this cushioning material even in the vertical direction of the bearing in addition to the bearing loading direction (a direction parallel with the axial center). CONSTITUTION:In a fixed bearing 7 consisting of ceramics and a turning bearing composed of a thrust bearing, a cushioning material 4 or 8 is installed on all surfaces excepting each sliding surface of either of the fixed bearing 7 or turning bearing 3 or both bearings, or all surfaces excepting the sliding surface and an inner circumferential surface otherwise, and further a case 5 or 9 is installed at the outside of this cushioning material 4 or 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust bearing device, and more particularly to a ceramic thrust bearing device used in a wide range of rotary machines such as motors and pumps.

[0002]

2. Description of the Related Art Conventionally, a thrust bearing composed of a fixed bearing made of ceramics and a rotary bearing has been used. This type of thrust bearing is disclosed in JP-A-62-28580.
As shown in JP-A No. 4 and JP-A-62-288719, a cushioning material is interposed between the fixed bearing or the rotary bearing and the mating member.

FIG. 9 shows a thrust bearing device disclosed in Japanese Unexamined Patent Publication No. 62-288719. In FIG. 9, reference numeral 21 is a rotary shaft, and a shaft is provided at an intermediate position of the rotary shaft 21. The thrust collar 22 is fixed by a key 23 so as to form a right angle, and a rotary bearing 24 made of an annular ceramic is bonded to an axial end surface of the thrust collar 22.

On the other hand, an opening 26 through which the rotary shaft 21 penetrates is formed in the fixed member 25, an annular recess 27 is formed on the surface in contact with the rotary bearing 24, and a cushioning material 28 made of plate-shaped rubber is provided. A fixed bearing 29 made of ceramics is attached to the surface of the cushioning material 28 facing the rotary bearing 24.
Is glued. The surface where the rotary bearing 24 and the fixed bearing 29 are in sliding contact with each other is finished to be a smooth flat surface and is provided so as to be at a right angle to the rotary shaft 21, and the sliding bearing on either side of the rotary bearing 24 or the fixed bearing 29 is provided. A spiral groove for generating dynamic pressure is formed on the contact surface.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the thrust bearing device disclosed in Japanese Patent No. 285804 and Japanese Patent Laid-Open No. 62-288719, as is clear from FIG. 9, a cushioning material that acts only in the load direction is provided, and the cushioning material is the axis of the rotary shaft. No consideration is given to the direction perpendicular to the axis.If the bearing (rotary bearing or fixed bearing) moves in the direction perpendicular to the shaft core, the bearing may drop from the cushioning material or contact the bearing support member on the outer circumference of the bearing. There was a problem that it might be damaged due to damage.

The present invention has been made in view of the above-mentioned circumstances, and by providing the cushioning material not only in the bearing load direction (direction parallel to the shaft core) but also in the vertical direction of the bearing, the direction perpendicular to the shaft core is provided. An object of the present invention is to provide a thrust bearing device in which even if the bearing moves, the bearing does not drop from the cushioning material and does not come into contact with the bearing support member on the outer periphery of the bearing to be damaged.

[0007]

In order to achieve the above-mentioned object, the thrust bearing device of the present invention is a thrust bearing composed of a fixed bearing and a rotary bearing made of ceramics, and either one of the fixed bearing and the rotary bearing is used. Or, a cushioning material is provided on all surfaces except sliding surfaces of both bearings or all surfaces except sliding surfaces and inner peripheral surfaces, and a case is provided outside the cushioning materials. Is.

[0008]

According to the present invention having the above-described structure, since the cushioning material is provided on one or more surfaces of the fixed bearing and / or the rotary bearing other than the sliding surface of the bearing, the bearing is removed from the cushioning material. It is possible to avoid the risk of the outer circumference of the bearing coming into contact with the bearing support member and being damaged. Further, it is possible to effectively absorb an eccentric load applied to the bearing and prevent uneven contact of the sliding surface.

[0009]

Embodiments of the thrust bearing device according to the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a thrust bearing device of the present invention. In FIG. 1, reference numeral 1 is a rotary shaft, and the rotary shaft 1 has a thrust disk 2 and a key 3
Is fixed by. A rotary bearing 3 made of ceramics is held on the thrust disk 2. The rotary bearing 3 is provided with a cushioning material 4 made of an elastic material on the surfaces other than the sliding surface of the rotary bearing 3, and a case 5 is provided outside the cushioning material 4.

On the other hand, a fixed bearing 7 is fixed to the fixed member 6. The fixed bearing 7 is provided with a cushioning material 8 on the surfaces other than the sliding surface of the fixed bearing 7, and a case 9 is provided outside the cushioning material 8. In FIG. 1, the example in which the cushioning material is not provided on the inner peripheral side has been described, but the cushioning material may be provided on the inner peripheral side.

FIG. 2 is a detailed view of the fixed bearing or the rotary bearing shown in FIG. 1, FIG. 2 (a) is a longitudinal sectional view, and FIG. 2 (b) is a side view. As is apparent from FIG. 2, the rotary bearing 3 or the fixed bearing 7 is covered with the cushioning material 4 (or 8) except for the sliding surface, and the case 5 is further provided outside the cushioning material 4 (or 8).
(Or 9) is provided.

FIG. 3 is a diagram showing a second embodiment of the thrust bearing device. In this embodiment, a recess 11 is formed in the rotary bearing 3 or the fixed bearing 7, and the case 5 (or 9) is formed.
A protrusion 12 that engages with the recess 11 is formed on the. The hollow 11 and the projection 12 prevent the rotary bearing 3 or the fixed bearing 7 from rotating. Other configurations are similar to those of the embodiment shown in FIG.

FIG. 4 is a diagram showing a third embodiment of the thrust bearing device. In this embodiment, a screw 13 is formed on the outer peripheral portion of the case 5 (or 9) of the rotary bearing 3 or the fixed bearing 7. There is. The bearing is adapted to be attached to the mating member by screws 13. Other configurations are similar to those of the embodiment shown in FIG.

FIG. 5 is a view showing a fourth embodiment of the thrust bearing device. In this embodiment, a flange 14 is formed on the case 5 (or 9) of the rotary bearing 3 or the fixed bearing 7, and this flange is formed. Hole for inserting flat head screw into 14
a is formed. Then, the bearing can be attached to the mating member by inserting a screw into the hole 14a and screwing the screw into the mating member. Other configurations are similar to those of the embodiment shown in FIG.

FIG. 6 is a view showing a fifth embodiment of the thrust bearing device. In this embodiment, only the flange 14 is formed on the case 5 (or 9) of the rotary bearing 3 or the fixed bearing 7. The bearing can be attached to the counterpart member by welding or bonding using the flange 14. Further, the outer peripheral portion of the case 5 (or 9) can be attached by press-fitting it into a mating member. Other configurations are similar to those of the embodiment shown in FIG.

FIG. 7 is a view showing a sixth embodiment of the thrust bearing device. In this embodiment, the thrust bearing device shown in FIG. 3 is formed with a spiral groove 15 for generating dynamic pressure on the sliding surface. It is a thing. Other configurations are similar to those of the embodiment shown in FIG. 2 to 7, the example in which the cushioning material is not provided on the inner peripheral side has been described, but the cushioning material may be provided on the inner peripheral side.

Next, an embodiment in which the thrust bearing shown in FIGS. 2 to 7 is installed in a multistage spiral pump will be described with reference to FIG. FIG. 8 is a cross-sectional view showing the overall structure of the multistage spiral pump of the present invention. In FIG. 8, reference numeral 31 is a casing, and this casing 31 is a suction port 32 and a discharge port 3.
It is equipped with 3. The inner casings 38 are connected in a multi-stage manner (three stages in the embodiment) in the casings 31, and the first-stage impellers 34, 2 are provided in the respective inner casings 38.
The third-stage impeller 35 and the third-stage impeller 36 are housed, respectively.

The first-stage impeller 34 is integrally fixed to the main shaft 37, and the second-stage impeller 35 and the third-stage impeller 36 are fixed to the main shaft 37 by a key or the like.
The rotary shafts 5 and 36 are rotated integrally with the main shaft 37 by transmitting the rotational force from the main shaft 37, but are configured to be movable on the main shaft 37 in the horizontal direction (axial direction).

A thrust bearing 39 having a dynamic pressure generating groove is installed at the suction port of each impeller 34, 35, 36. The thrust bearing 39 is composed of a fixed bearing 7 made of ceramics fixed to an inner casing 38 accommodating the impellers of each stage, and a ceramics installed facing the fixed bearing 7 and integrally fixed to each impeller. The rotary bearing 3 is provided. Cushioning material 4 (or 8) and case 5
The configuration of (or 9) is the same as that of the embodiment shown in FIGS.

[0020]

As described above, according to the present invention, since the cushioning material is provided on one or more surfaces other than the sliding surface of one or both of the fixed bearing and the rotary bearing, the bearing has a cushioning material. It is possible to avoid the risk of the outer periphery of the bearing coming into contact with the bearing support member and being damaged without falling off from the bearing support member.
Further, it is possible to effectively absorb an eccentric load applied to the bearing and prevent uneven contact of the sliding surface.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the overall configuration of a thrust bearing device according to the present invention.

2A and 2B are views showing a first embodiment of a thrust bearing device according to the present invention, FIG. 2A being a longitudinal sectional view and FIG. 2B being a side view.

FIG. 3 is a view showing a second embodiment of the thrust bearing device according to the present invention, FIG. 3 (a) is a longitudinal sectional view and FIG. 3 (b) is a side view.

FIG. 4 is a view showing a third embodiment of the thrust bearing device according to the present invention, FIG. 4 (a) is a vertical sectional view and FIG. 4 (b) is a side view.

5A and 5B are views showing a fourth embodiment of the thrust bearing device according to the present invention, FIG. 5A being a longitudinal sectional view and FIG. 5B being a side view.

FIG. 6 is a view showing a fifth embodiment of the thrust bearing device according to the present invention, FIG. 6 (a) is a vertical sectional view and FIG. 6 (b) is a side view.

FIG. 7 is a view showing a sixth embodiment of the thrust bearing device according to the present invention, FIG. 7 (a) is a longitudinal sectional view and FIG. 7 (b) is a side view.

FIG. 8 is a vertical cross-sectional view of a multistage spiral pump equipped with the thrust bearing device according to the present invention.

FIG. 9 is a vertical sectional view of a conventional thrust bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotating shaft 2 thrust disk 3 rotating bearing 4 cushioning material 5 case 6 fixed side member 7 fixed bearing 8 cushioning material 9 case 11 recess 12 protrusion 13 screw 14 flange 15 spiral groove

Claims (7)

[Claims] 1. In a thrust bearing composed of a fixed bearing and a rotary bearing made of ceramics, one or both of the fixed bearing and the rotary bearing, or all surfaces or sliding surfaces other than the sliding surfaces of the bearings, and A thrust bearing device characterized in that a cushioning material is provided on all surfaces except the inner peripheral surface, and a case is provided on the outer side of the cushioning material. 2. In a thrust bearing composed of a fixed bearing and a rotary bearing made of ceramics, one or both of the fixed bearing and the rotary bearing, or all surfaces or sliding surfaces other than the sliding surface of the bearing, A thrust bearing device characterized in that a cushioning material is provided on all surfaces except an inner peripheral surface, and a case having a projection or a recess for preventing rotation of the bearing is provided outside the cushioning material. 3. The thrust bearing device according to claim 1, wherein a screw is provided on an outer peripheral portion of the case so as to be attachable to a mating member. 4. The thrust bearing device according to claim 1, wherein the case is provided with a flange so that it can be attached to a counterpart member with a screw or a rivet. 5. The thrust bearing device according to claim 1, wherein the case can be attached to a counterpart member by welding or adhesion. 6. The thrust bearing device according to claim 1, wherein the case is attachable to a mating member by press fitting. 7. The thrust bearing device according to claim 1, wherein either one of the fixed bearing and the rotary bearing is provided with a groove for generating a dynamic pressure.