JP2005155745A - Vibration control bearing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control bearing unit capable of suppressing transmission of vibration without increasing time and labor and cost required in assembly by reduced number of parts even if a rotary body is a rotary device having large diameter. <P>SOLUTION: A flange part 2 provided on an outer ring 1 of a double row ball bearing is tightened and fixed on a fixed frame 11 of the rotary device by a bolt 12. By mounting a rubber-made vibration control member 4 like a flat ring around the bolt 12 so that it is provided between the fixed frame 11 and the flange part 2, transmission of vibration of the rotary body 13 supported by the double row ball bearing to the fixed frame 11 is suppressed without increasing time and labor and cost required in assembly by reduced number of parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vibration suppression bearing unit that suppresses vibration of a rotating device.

  In a rotating device that supports a large-diameter rotating body on a fixed frame such as a rotating device such as a CT scanner, a bearing unit having a flange portion that fixes either the inner ring or the outer ring of a rolling bearing to the fixed frame is a rotating body. It is used to support. If the fixed frame is not very rigid, such as a CT scanner rotating device, the vibration generated from the inside of the rolling bearing or the vibration caused by the natural vibration of the rotating body propagates to the fixed frame and the fixed frame Resonates and may adversely affect the body parts and performance.

  On the other hand, as a rolling bearing that suppresses the propagation of vibration of the rotating device, the rolling bearing and the bearing housing that fixes the rolling bearing to the rotating device, that is, the inner diameter surface and side surface of the inner ring and the outer diameter surface and side surface of the outer ring. There is a rolling bearing with a damper in which a damping member is interposed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2001-32849 (first page, FIG. 1-2)

  The above-described conventional rolling bearing with damper requires a vibration damping member to be interposed between the radial surface and the side surface of the inner ring or outer ring that abuts the bearing housing, so that it takes time to assemble the bearing and increases the number of parts. There is. In addition, when a large-diameter rotating body such as a CT scanner rotating device is supported and applied to a rolling bearing having a large bearing outer diameter of about 1 m, the damping member also has a large size. The molding cost and material cost increase, and the assembly of the bearing becomes more laborious.

  Accordingly, an object of the present invention is to provide a vibration-damping bearing unit capable of suppressing the propagation of vibration without increasing the labor and cost of assembling with a small number of parts even if the rotating body is a rotating device having a large diameter. Is to provide.

  In order to solve the above-described problems, a vibration-damping bearing unit according to the present invention includes a flange unit that fixes either an inner ring or an outer ring of a rolling bearing to a fixed frame, and the flange unit is bolted. A configuration was adopted in which a damping member was interposed between the flange part to be bolted and the fixed frame so as to be fixed to the fixed frame.

  That is, by fixing the flange portion for fixing to the fixed frame by bolting and interposing a vibration damping member between the bolted flange portion and the fixed frame, the labor and cost of assembling with a small number of parts can be achieved. It is now possible to suppress the propagation of vibrations inside the bearing and the rotating body to the fixed frame without increasing the torque.

  By interposing the damping member around the bolt tightening portion, the damping member can be made to have a very small size.

  Further, the vibration-damping bearing unit of the present invention is a bearing unit including a flange portion that fixes either an inner ring or an outer ring of a rolling bearing to a fixed frame, and the inner diameter of the inner ring on the side to be fixed to the flange portion. A configuration is also adopted in which a cylindrical portion for fitting the outer diameter surface of the surface or the outer ring is provided, and a damping member is interposed between the inner diameter surface of the inner ring to be fitted or the outer diameter surface of the outer ring.

  That is, a flange portion for fixing to the fixed frame is provided with a cylindrical portion that fits the inner diameter surface of the inner ring to be fixed or the outer diameter surface of the outer ring, and the inner diameter surface of the inner ring to be fitted to this cylindrical portion or By interposing a damping member between the outer ring and the outer diameter surface of the outer ring, it is possible to suppress propagation of the vibration in the bearing and the rotating body to the fixed frame.

  Each damping member described above may be formed of any one of rubber, a resin material, and a damping metal material.

  Furthermore, the vibration-damping bearing unit of the present invention employs a structure in which the flange portion is formed of a vibration-damping metal material in a bearing unit including a flange portion that fixes either the inner ring or the outer ring of the rolling bearing to the fixed frame. did.

  That is, by forming the flange portion for fixing to the fixed frame with a vibration-damping metal material, it is possible to suppress the propagation of the vibration inside the bearing and the rotating body to the fixed frame.

  As the damping metal material, gray cast iron or spheroidal graphite cast iron can be used.

  The vibration-damping bearing unit of the present invention is such that the flange portion for fixing to the fixed frame is bolted, and a damping member is interposed between the flange portion to be bolted and the fixed frame. Propagation of the vibration of the inside of the bearing and the rotating body to the fixed frame can be suppressed without increasing the labor and cost of assembly with a small number of parts. As the damping member, rubber, resin material, damping metal material, or the like can be used. Rubber is inexpensive and has the highest damping effect. Resin materials have the advantage of good moldability like rubber. Further, the damping metal material has the advantages of small tightening displacement and high strength.

  By interposing the vibration damping member around the bolted portion, the vibration damping member can be of a very small size.

  Further, the vibration-damping bearing unit of the present invention is provided with a cylindrical portion for fitting the inner diameter surface of the inner ring to be fixed or the outer diameter surface of the outer ring on the flange portion for fixing to the fixed frame. Since the damping member is interposed between the inner diameter surface of the inner ring to be fitted or the outer diameter surface of the outer ring, the inside of the bearing and the rotating body can be achieved with a small number of parts and without increasing the labor and cost of assembly. Propagation of vibration to the fixed frame can be suppressed.

  Furthermore, since the vibration-damping bearing unit of the present invention is also formed of a vibration-damping metal material with the flange portion for fixing to the fixed frame, the inside of the bearing and the rotation can be performed without increasing the number of parts and the trouble of assembly. Propagation of body vibration to the fixed frame can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment. This vibration-damping bearing unit is used in a CT scanner rotating device, and a flange portion 2 provided on an outer ring 1 of a double row ball bearing is fastened and fixed to a fixed frame 11 of the rotating device with a bolt 12 to form a double row. A rotating body 13 of a rotating device is attached to the inner ring 3 a outside the ball bearing with a bolt 14, and a heavy equipment 15 for photographing or the like is attached to the inner diameter surface of the rotating body 13. The weight device 15 causes an unbalanced load on the rotating body 13 and causes the rotating body 13 and the double row ball bearing to vibrate.

  Between the fixed frame 11 and the flange portion 2, a flat ring-shaped rubber damping member 4 is mounted around the bolt 12, and vibrations of the rotating body 13 and the double row ball bearing propagate to the fixed frame 11. It is designed to suppress this. The inner ring 3b on the inner side of the double row ball bearing is fitted to a step inner diameter surface provided on the outer inner ring 3a and is prevented from coming off by a pressing plate 5, and is arranged between the inner rings 3a, 3b and the outer ring 1. The double-row balls 6 thus held are held by a cage 7.

  An accelerometer was attached to the fixed frame 11 of the rotating device of the CT scanner described above, and the vibration in the plate surface direction of the fixed frame 11 when the rotation number of the rotating body 13 was changed was measured. As a comparative example, vibration was measured when the damping member 4 was not interposed between the fixed frame 11 and the flange portion 2.

  FIG. 2 shows a vibration measurement result in the plate surface direction of the fixed frame 11. In the example in which the damping member 4 is interposed, the vibration value is reduced to about half that in the comparative example, and it can be seen that the effect of preventing the propagation of vibration to the fixed frame 11 is great.

  FIG. 3 shows a second embodiment. In this vibration-damping bearing unit, the flange portion 2 of the bearing support member 8 is fastened and fixed to the fixed frame 11 of the rotating device with the bolts 12, and the double row ball bearing is divided into two in the cylindrical portion 8 a provided on the bearing support member 8. An inner ring 3 is fitted and a rotating body 13 of a rotating device is attached to the integrated outer ring 1 with bolts 14, and the fixed frame 11 and the flange portion 2 are disposed in the same manner as in the first embodiment. A flat ring-shaped rubber damping member 4 is mounted around the bolt 12 so as to be interposed therebetween. In this embodiment, the heavy equipment 15 is attached to the outer diameter surface of the rotating body 13, and the double row balls 6 arranged between the inner rings 3 and the outer rings 1 that are prevented from coming off by the pressing plate 5 are held. It is held by the vessel 7.

  FIG. 4 shows a third embodiment. This vibration suppression bearing unit has the same basic configuration as that of the second embodiment, and the vibration suppression member 4 that suppresses the propagation of vibration to the fixed frame 11 includes the cylindrical portion 8a of the bearing support member 8. The difference is that the inner rings 3 are mounted so as to be interposed between the inner diameter surfaces of the inner rings 3. The damping member 4 is formed of a cylindrical resin material.

  FIG. 5 shows a fourth embodiment. The basic structure of this vibration damping bearing unit is the same as that of the second embodiment. Instead of mounting the vibration damping member 4, the bearing support member 8 is formed of gray cast iron, which is a vibration damping metal material. Is different.

  In each embodiment described above, the bearing portion of the vibration suppression bearing unit is a ball bearing. However, the bearing portion of the vibration suppression bearing unit according to the present invention may be a rolling bearing, and the bearing portion is a roller bearing, a tapered roller bearing, or the like. It can also be applied to those.

Partially omitted vertical sectional view showing the vibration-damping bearing unit of the first embodiment The graph which shows the result of having measured the vibration suppression characteristic of the damping bearing unit of FIG. Partially omitted vertical sectional view showing the vibration-damping bearing unit of the second embodiment Partially omitted vertical sectional view showing the vibration-damping bearing unit of the third embodiment Partially omitted vertical sectional view showing the vibration-damping bearing unit of the fourth embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Flange part 3, 3a, 3b Inner ring 4 Damping member 5 Holding plate 6 Ball 7 Cage 8 Bearing support member 8a Tube part 11 Fixing frame 12 Bolt 13 Rotating body 14 Bolt 15 Heavy equipment

Claims (6)

  In a bearing unit having a flange portion for fixing either one of an inner ring or an outer ring of a rolling bearing to a fixed frame, the flange portion is fixed to the fixed frame by bolting, and the bolted flange portion and the fixed frame Damping bearing unit characterized in that a damping member is interposed between   The vibration damping bearing unit according to claim 1, wherein the vibration damping member is interposed around the bolt fastening portion.   In a bearing unit including a flange portion that fixes either an inner ring or an outer ring of a rolling bearing to a fixed frame, the inner diameter surface of the inner ring on the fixed side or the outer diameter surface of the outer ring is fitted to the flange portion. A vibration-damping bearing unit comprising a tube portion, and a vibration-damping member interposed between the tube portion and an inner diameter surface of an inner ring to be fitted or an outer diameter surface of an outer ring.   The vibration damping bearing unit according to any one of claims 1 to 3, wherein the vibration damping member is formed of any one of rubber, a resin material, and a vibration damping metal material.   A vibration-damping bearing unit comprising a flange portion for fixing either one of an inner ring or an outer ring of a rolling bearing to a fixed frame, wherein the flange portion is formed of a vibration-damping metal material.   The vibration-damping bearing unit according to claim 5, wherein the vibration-damping metal material is gray cast iron or spheroidal graphite cast iron.

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