JP2013029149A - Rolling bearing with aligning function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing with an aligning function which has alignment performance by using an aligning ring and saves space, extends its life, receves a high load, and smoothly actuates the aligning function.SOLUTION: The rolling bearing with the aligning function for rotatably supporting a fixed member by applying the alignment performance to a rotation member, includes inner and outer rings, a plurality of rolling elements which are rollably arranged therebetween, and the aligning ring. The aligning ring has an inner surface fitted to a rotary shaft and a spherical outer peripheral surface. The inner surface of the inner ring is formed in a spherical shape to adhere tightly to the spherical outer peripheral surface of the aligning ring. A plural rows of load center lines of the rolling element approach to each other toward the center shaft of the bearing.

Description

  The present invention relates to a rolling bearing provided with a centering function.

  For example, a rolling bearing with a centering function as shown in a sectional view in FIG. 3 is generally used for a bearing that supports a shaft that requires a relatively large load and that requires alignment, such as a rolling mill roll bearing. A bearing is used. (Patent Document 1) In this rolling bearing with a centering function, two rows of raceway surfaces 12 a and 12 a are formed on the inner ring 12, and two rows of raceway surfaces 11 a and 11 a are provided on the inner peripheral surface of the outer ring 11. The outer peripheral surface of the outer ring 11 has a shape that forms part of a spherical surface. Between the inner ring 12 and the outer ring 11, a plurality of rollers 13 for rotating the outer ring and the inner ring relative to each other are disposed.

  Further, by providing a aligning ring 20 having a spherical inner peripheral surface so as to correspond to the spherical outer peripheral surface of the outer ring 11, the axial center of the aligning ring, the outer ring 11 and the inner ring 12 are provided. Thus, the inner ring 12 and the outer ring 11 can be inclined relative to the aligning ring 20.

JP 2003-343553 A

  However, in the rolling bearing with the aligning function as in Patent Document 1, a space for providing the aligning function on the outer ring outer diameter side is required, and there is a concern that the design of the pitch circle diameter of the rolling element is restricted. It was. In other words, there has been a limit to increasing the number of rolling elements by enlarging the pitch circle diameter of the rolling elements, in response to the problem of handling high loads required for recent bearings. Further, since the load center lines of the double row rolling elements are arranged so as to be separated from each other as they go to the bearing central axis, the inner ring can be enlarged for the purpose of improving the strength of the flange portion of the inner ring that receives the rolling elements. Inevitable, this was a major limitation in the downsizing of the bearing in the axial direction.

  The present invention has been made in view of such circumstances, and is a bearing that is aligned by an aligning ring, and is capable of handling a high load, while being space-saving and achieving a long life. The purpose is to provide a rolling bearing with a heart function.

  A first invention for solving the above problem is a rolling bearing with a centering function for rotating and supporting a rotating member with a centering property with respect to a fixed member, the inner ring and the outer ring, between them A plurality of rolling elements arranged in a double row and provided with a plurality of rolling elements and a centering ring. The centering ring has an inner peripheral surface fitted to the rotating shaft and a spherical outer periphery. In the rolling bearing with a centering function, the rolling elements provided in the double row are formed in a spherical shape in which the inner peripheral surface of the inner ring has a surface and is in close contact with the spherical outer peripheral surface of the aligning ring The load center lines are arranged so as to approach each other as they approach the central axis of the bearing.

  The second invention is such that the load center lines of the rolling elements in the double row intersect with each other on the bearing center axis, and the contact point between the aligning ring and the inner ring is located on the load center line. It is characterized by arranging rolling elements in

  According to the present invention, by arranging the aligning ring on the inner ring inner diameter side, the pitch circle diameter of the rolling elements is increased according to the required load capacity, and the number of rolling elements is increased, thereby requiring a high load. Can be supported. In addition, since the rolling elements are arranged so that the load center lines of the double row rolling elements intersect each other on the bearing center axis, the load applied to the rolling elements cancels each other by the double row rolling elements. Also, the reinforcement of the inner ring collar is not required, which can contribute to space saving of the bearing. Furthermore, since the rolling elements are arranged so that the contact point between the aligning ring and the inner ring is located on the load center line, smooth alignment is possible.

It is sectional drawing which shows the rolling bearing with the alignment function of embodiment of this invention. It is an inner ring exploded view of a rolling bearing with a centering function of an embodiment of the present invention. It is a figure which shows the conventional rolling bearing with a centering function.

Hereinafter, embodiments of the present invention will be described.
As shown in FIG. 1, the rolling bearing with the alignment function of the present embodiment includes an inner ring 2, an outer ring 1, a plurality of rolling elements 3 arranged in a double row between the inner ring 2 and the outer ring 1, and the inner ring. A centering ring 4 is provided on the inner diameter side.

  The aligning ring 4 is formed in a hollow cylindrical shape, and a rotary shaft 5 is fixed through the inner diameter side, and the outer diameter surface is formed in a convex spherical shape. The inner ring surface of the inner ring 2 is also formed in a concave spherical shape so as to correspond to the spherical outer diameter surface of the aligning ring 4 to enable a bearing aligning function.

  The center lines S1 and S2 of the loads received by the double row rolling elements 3 are provided so as to approach each other as the load center lines S1 and S2 move toward the bearing center axis L, and intersect each other on the bearing center axis. You may do it.

  The rolling elements 3 are arranged so that the contact points between the inner ring 2 and the aligning ring 4 are on the center lines S1 and S2 of the load applied to the rolling elements 3. By doing in this way, since the load transmission direction through the outer ring 1, the inner ring 2, and the aligning ring 4 coincides, smooth alignment becomes possible.

  Conventionally, the assembling of the aligning ring and the inner ring has been performed by inserting a slit in the aligning ring and pushing the inner ring while reducing the diameter of the aligning ring (not shown). However, in the present invention, as shown in FIG. 2, the inner ring 2 is composed of split members 2 a and 2 b that are bilaterally symmetrically divided. The inner ring 2 and the aligning ring 4 can be easily assembled by sliding and covering the divided members 2a and 2b and fixing the through holes 2c provided in the divided members 2a and 2b with bolts. .

  By adopting the structure as described above, it is possible to easily meet the high load demand of a rolling bearing with a centering function, contribute to space saving of the bearing, and contribute to smooth alignment. Further, the aligning ring can be easily assembled.

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Rolling element 4 Alignment ring 5 Rotating shaft 2a Dividing member 2b Dividing member

Claims (2)

  A rolling bearing with a centering function for rotating and supporting a rotating member with respect to a fixed member. The inner ring and the outer ring are arranged so as to roll freely between them, and are provided in double rows. A plurality of rolling elements and a centering ring, the centering ring has an inner peripheral surface fitted to the rotation shaft, a spherical outer peripheral surface, and an inner peripheral surface of the inner ring, In the rolling bearing with a centering function formed in a spherical shape in close contact with the spherical outer peripheral surface of the aligning ring, as the load center line of the rolling elements provided in the double row moves toward the center axis of the bearing. A rolling bearing with a centering function, wherein the rolling bearings are provided so as to approach each other.   The rolling elements are arranged so that the load center lines of the rolling elements in the double row intersect with each other on the bearing center axis, and the contact point between the aligning ring and the inner ring is located on the load center line. The rolling bearing with a centering function according to claim 1, wherein the rolling bearing has a centering function.

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