JPH09100831A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform excellent bearing effect by preventing an uneven load to a bearing of a rotary shaft in a bearing device of the rotary shaft of a pump used for river and sea water service. SOLUTION: A bearing case 3 is fitted to a casing 1, a retainer 5 is held on an inner surface of the case 3 by elastic bodies 6, 7, 10, 13, and upper and lower elastic bodies 10, 13 are supported on the bearing case 3 through holding plates 11, 14 and bolts 12, 15. A ceramics bearing 4 is shrink fitted to the inner surface of the retainer 5 to rotatably support the rotary shaft 2. A stopper pin 8 is embedded in the case 3, its tip is inserted in an oblong locking hole 9 in the retainer 5 with a clearance, and the retainer 5 is movable in the radial direction and in the axial direction. Even when the rotary shaft 2 is inclined and unevenly loaded onto the bearing 4, the retainer 5 is moved by the elastic bodies 6, 7, 10, 13 to avoid the uneven load, and the wear of the bearing is prevented and excellent bearing effect is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device suitable for use as a bearing for a rotary shaft of a river water pump or a seawater pump.

[0002]

2. Description of the Related Art FIG. 8 is a vertical sectional view of a conventional bearing device configured to guide water to a bearing surface, and FIG. 9 is a YY sectional view thereof. In these figures, 101 is a casing, 1
Reference numeral 02 denotes a bearing case that is inserted into the inner circumference of the casing 101 and has one end fixed to the casing 101. Reference numeral 103 is a ceramic bearing fixed to the inner circumference of the bearing case 102 by shrink fitting, and the ceramic bearing 103 has a gap h.
And the rotary shaft 104 is inserted. Although not shown in the figure, an impeller is provided below the rotary shaft 104, and the impeller sucks and discharges the water W by the rotation of the rotary shaft 104.

[0003]

In the conventional bearing device described above, the rotary shaft 104 is flexed in the axial direction so that the end portion of the ceramic bearing 103 is partially contacted, or the bearing case 10 is used.
Bearing case 1 due to mounting error between 2 and casing 101
02 is inclined in the axial direction of the rotating shaft, and the ceramic bearing 103
There may be a case where the end of the shaft and the rotating shaft 104 are unbalanced. When this one-sided contact occurs, the ceramic bearing 103 has a high Young's modulus of the ceramic material and has the property of being less likely to be elastically deformed, so that the surface pressure, which is the load per unit area of the contact portion, increases, and the bearing sliding surface at that time. The temperature rises abnormally and the ceramic seizes.

As a result, the ceramic bearing 103 may be abraded or damaged. If the ceramic bearing 103 is worn or damaged in this way, the rotating shaft 104 cannot be normally supported, and there is a problem that the operation of the pump or the like is hindered.

[0005]

SUMMARY OF THE INVENTION In order to solve such a problem in a conventional bearing device, the present invention is arranged in a bearing case fixed in a casing, a ceramic bearing provided in the bearing case, and a ceramic bearing. In a bearing device equipped with a rotating shaft, a retainer pin fixed to the bearing case, a retainer with a ceramic bearing on the inner circumference and a hole for inserting the retainer pin on the outer circumference, and a retainer supported on the bearing case To provide a bearing device having an elastic body.

That is, the present invention comprises a bearing case fixed in a casing, a ceramic bearing integrally provided on the inner circumference of the bearing case, and a rotary shaft arranged on the inner circumference of the ceramic bearing. In the bearing device described above, a detent pin fixed to penetrate through the inner peripheral surface of the bearing case; provided between the inner periphery of the bearing case and the ceramic bearing, and the ceramic bearing is burnt on the inner periphery. And
A hole for inserting the tip of the rotation stop pin on the outer periphery, the outer shape of which is larger than the outer diameter of the pin, and the bottom surface of which is a long hole shape rotation stop having a predetermined gap with the tip of the pin. A retainer having a pin hole; and an elastic body interposed between the retainer and the bearing case on the outer circumference and both ends in the axial direction of the retainer to support the retainer on the bearing case. A characteristic bearing device is provided.

With the bearing device of the present invention having such a structure, the rotary shaft is tilted, and the bearing case is tilted in the axial direction due to an error in mounting or assembling, so that high surface pressure acts on the ceramic bearing. Even if one-sided contact occurs, the rotating shaft and ceramic bearing avoid one-sided contact by the elastic bodies installed on the outer periphery of the retainer that shrink-fits the ceramic bearing and both ends of the retainer. As the retainer moves like this, one-sided contact does not occur.

The retainer supported by the elastic body is prevented from rotating by a retainer pin fixed to the bearing case. The retainer pin hole provided in the retainer is larger than the outer diameter of the retainer pin. Is large and has a long hole shape in the axial direction, the movement to avoid one-sided contact of the retainer is not restricted by the detent pin, and a predetermined gap is also formed in the radial direction between the pin tip and the detent hole bottom surface. As a result, the radial movement of the retainer is not restricted, and a good rotary shaft bearing action can be performed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a bearing device according to a first embodiment of the present invention, and FIG. 2 is an explanatory view showing a relative positional relationship between a retaining hole of a retainer and a pin in FIG.

In FIG. 1, a bearing case 3 is fixed to a casing 1, a retainer 5 is radially supported on the inner surface of the bearing case 3 by elastic members 6 and 7, and is made of rubber O in the axial direction. The upper and lower sides are held by elastic bodies 10, 13 composed of rings, square rings, etc.
13 is vertically supported by pressing plates 11 and 14, respectively. The holding plates 11, 14 are bolts 12,
It is fixed to the bearing case 3 by 15.

On the inner surface of the retainer 5, for example, Si ₃ N _{4 is used.}
The cylindrical ceramic bearing 4 such as
The rotary shaft 2 is supported, and water W passes through the gap between the rotary shaft 2 and the ceramic bearing 4 as in the conventional example. In order to prevent the ceramic bearing 4 and the retainer 5 from rotating together with the rotation of the rotary shaft 2, a retaining pin 8 is inserted and fixed in the bearing case 3, and a tip of the retaining pin 8 is machined and formed on the retainer 5. It is inserted with a gap in the hole 9.

FIG. 2 is a view showing the positional relationship between the rotation stop hole 9 and the rotation stop pin 8 formed in the retainer 5.
In (A), the detent pin 8 is located near the center of the detent hole 9 which is an elongated hole in the axial direction, and the retainer 5 is movable in the directions of arrows a and b so that the detent pin 8 can be moved. Therefore, the ceramic bearing 4 fixed to the inner surface can follow the movement of the rotary shaft 2 and no one-sided contact occurs.

In FIG. 2 (B), the detent pin 8 is left at one end of the detent hole 9 and has a detent action in the direction of the arrow b. The movement of the retainer 5 is not restricted in the a direction, and the ceramic bearing 4 has an elastic supporting function, so that a good bearing action is maintained.

In the bearing device having such a structure, even if the rotary shaft 2 is inclined and one-sided contact with the ceramic bearing 4 is performed, the ceramic bearing 4 together with the retainer 5 is provided with the elastic body 6 described above.
Since 7, 10, 13 are elastically supported, the position thereof is moved so that one-sided contact does not occur.

Further, since the detent pin 8 is also configured to have a gap in the detent hole 9 in the radial direction, the retainer 5 is provided.
The movement of is not regulated to prevent seizure of the bearing and maintain good bearing action.

FIG. 3 is a diagram for explaining the effect of the first embodiment described above, showing the relationship between the operating time T (Hr) and the bearing temperature t (° C.). In the figure, when the rotary shaft 2 hits the ceramic bearing 4 as shown by the dotted line in the prior art, abnormal heat is generated due to an increase in the surface pressure of the sliding surface, and the temperature rises sharply to above the seizure temperature Ts. The bearing 4 may be burned and damaged.

On the other hand, in the case of the present invention, as shown by the solid line, due to the effect of the elastic support of the bearing 4 and the retainer 5 and the rotation stop support structure which does not regulate the movement thereof, the temperature rise also slightly rises below the baking temperature. , Exhibiting good bearing action.

FIG. 4 is a vertical cross-sectional view of a bearing device according to a second embodiment of the present invention, and FIG. 5 is a view showing a relative positional relationship between the retainer hole of the retainer and the retainer pin 8. In these figures, the description of the portion having the same configuration as that of the first embodiment shown in FIG. 1 is omitted, but the retainer 15 is formed with a rotation stop hole 19 in a groove shape over the entire axial length of the retainer 15. However, there is no structure that restricts the rotation stop pin 8 in the axial direction, and the other structure is the same as the first embodiment shown in FIG.

FIG. 5 shows the state of formation of the detent hole 19 in the retainer 15 and the positional relationship of the detent pin 8. Since the retainer hole 19 is formed in the entire length in the axial direction in this manner, there is no fear of restricting the retainer 15 in the axial direction, and the first embodiment
In addition to the same operation and effect as the form, there is an effect that dimensional control is also facilitated.

FIG. 6 is a vertical cross-sectional view of a bearing device according to a third embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along the line XX of FIG. Show the relationship. In these figures, the first of the implementations shown in FIG.
Although the description of the parts having the same configurations as those of the embodiment is omitted, in the third embodiment of the present invention, the retainer 25 is not provided with a rotation stop hole on the outer periphery thereof, and the retainer 25 is provided with a rotation stop hole 29 at the upper end thereof.

The whirl-stop pin 28 is inserted into and fixed to the upper end of the bearing case 23, and a hole is made in the elastic body 10 such as a rubber square ring. It is configured to have a gap with the bottom of the hole 29. Non-rotating hole 2
9 has a long hole shape in the radial direction from the center of the shaft, so that the retainer 25 is not restricted in the radial direction by the locking pin 28. With such a configuration, a bearing device is provided that has the same operation and effect as those of the first embodiment shown in FIG. 1 and that is easy to assemble and manage without any one-sided contact.

According to the first to third embodiments described above, even when the ceramic bearing 4 is subjected to one-sided contact such that high surface pressure acts, the outer peripheral portion and both end portions of the retainer 5 or 15 or 25. The elastic bodies 6, 7, 10 and 13 provided in the flexure allow the rotating shaft 2 and the ceramic bearing 4 to avoid one-sided contact, so that one-sided contact does not occur. Elastic bodies 6, 7, 10 and 13
The retainer 5 or 15 or 25 supported by the rotation stopper pin 8 is fixed to the bearing case 3 in the first and second embodiments, or the bearing case 2 in the third embodiment.
This is performed by the rotation stop pin 28 fixed to the upper end of the retainer 3, but in the first and second embodiments, the pin 8 and the rotation stop holes 9 and 19 are elongated holes in the axial direction.
Is not restrained by the pin 8 and a gap is formed between the tip of the pin 8 and the bottoms of the rotation stopping holes 9 and 19 in the radial direction.
In addition, in the third embodiment, the detent hole 28 has a long hole shape in the radial direction, and a gap is formed between the detent pin 28 and the detent hole 29 in the axial direction. Therefore, it is not restricted, and a good rotation shaft support action is achieved.

[0023]

As described above in detail, the present invention is a bearing provided with a bearing case fixed in a casing, a ceramic bearing provided in the bearing case, and a rotary shaft arranged in the ceramic bearing. In the device, a bearing provided with a detent pin fixed to the bearing case, a retainer having a ceramic bearing shrink-fitted on the inner periphery and a detent pin insertion hole provided on the outer periphery, and an elastic body for supporting the retainer in the bearing case. Due to the device configuration, the ceramic bearings are elastically supported by the elastic bodies installed on the outer periphery and both ends of the retainer, and the rotation stopper does not impair the followability of the retainer's rotation axis movement, so one-sided contact is possible. It does not occur and seizure due to high surface pressure does not occur, and a good bearing action is performed.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a bearing device according to a first embodiment of the present invention.

2A and 2B are diagrams showing an arrangement relationship between a detent hole formed in a retainer and a detent pin in FIG. 1, where FIG. 2A is a state in which the pin is at a center position, and FIG. 2B is a detent action in a radial direction. Shows the state of presenting.

FIG. 3 is a graph showing the effect of the present invention and is a diagram showing the relationship between operating time and bearing temperature.

FIG. 4 is a vertical cross-sectional view of a bearing device according to a second embodiment of the invention.

5 is a diagram showing a positional relationship between a rotation stop hole and a rotation stop pin in FIG.

FIG. 6 is a vertical cross-sectional view of a bearing device according to a third embodiment of the invention.

7 is a cross-sectional view taken along line XX in FIG.

FIG. 8 is a vertical cross-sectional view of a conventional bearing device.

9 is a sectional view taken along line YY in FIG.

[Explanation of symbols]

 1 Casing 2 Rotating shaft 3,23 Bearing case 4 Ceramic bearing 5,15,25 Retainer 6,7,10,13 Elastic body 8,28 Rotation stop pin 9,19,29 Rotation stop hole 11,14 Holding plate

Claims (1)

[Claims] 1. A bearing case fixed in a casing,
In a bearing device comprising a ceramic bearing integrally provided on the inner circumference of the bearing case and a rotating shaft arranged on the inner circumference of the ceramic bearing, the bearing device is fixed by penetrating the inner circumferential surface of the bearing case. An anti-rotation pin; provided between the inner circumference of the bearing case and the ceramic bearing, the ceramic bearing is shrink-fit on the inner circumference, and a hole for inserting the tip of the anti-rotation pin is provided on the outer circumference. And a retainer having an elongated hole-shaped hole for a rotation-stopping pin, the outer shape of which is larger than the outer diameter of the pin, and the bottom surface of which has a predetermined gap with the pin tip; the retainer and the bearing. A bearing device, comprising: an elastic body interposed between the case and the outer periphery of the retainer and at both ends in the axial direction to support the retainer on the bearing case.