JP4497117B2 - Rolling bearing - Google Patents

Description

  The present invention relates to a rolling bearing, and more particularly to a rolling bearing that is suitable for use as a bearing that supports a drive roll and a driven roll of a continuous casting machine.

  Conventionally, as a rolling bearing that has a large radial load capacity and that can be loaded with an axial load, there is a cylindrical roller bearing described in Japanese Utility Model Laid-Open No. 3-119613 (Patent Document 1). On both sides of the cylindrical raceway surfaces of the outer ring and the inner ring of this cylindrical roller bearing, flanges are formed so that the cylindrical roller cannot move in the axial direction with respect to both the outer ring and the inner ring. . That is, in this cylindrical roller bearing, the outer ring cannot move in the axial direction with respect to the inner ring.

  The cylindrical roller bearing is, for example, arranged between the housing and the shaft in an environment where the shaft on which the inner ring is fixed moves in the axial direction with respect to the housing on which the outer ring is fixed. An axial load generated due to the movement of the shaft in the axial direction is applied.

However, in the conventional cylindrical roller bearing described above, both the outer ring and the inner ring have flanges on both sides of the respective cylindrical raceway surfaces, so that the cylindrical roller bearing conveniently has as many as four flanges. Further, there is a problem in that wear of the flange portion is likely to occur due to the galling between the cylindrical roller and the flange portion, and the axial play tends to be large.
Japanese Utility Model Publication No. 3-119613 (FIG. 6)

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing having a long life and a large load capacity for radial load and capable of being loaded with an axial load.

In order to solve the above problems, the rolling bearing of the present invention is
An outer ring having an inner circumferential surface composed of a plurality of cylindrical surfaces and an annular groove between the plurality of cylindrical surfaces;
An inner ring whose outer peripheral surface is composed of a plurality of cylindrical surfaces and an annular groove between the plurality of cylindrical surfaces;
The outer peripheral surface is composed of a plurality of cylindrical surfaces and an annular groove between the plurality of cylindrical surfaces, and a rolling element disposed between the inner peripheral surface and the outer peripheral surface of the inner ring,
A plurality of first balls disposed between the annular groove of the outer ring and the annular groove of the rolling element;
It is characterized by comprising a plurality of second balls arranged between the annular groove of the rolling element and the annular groove of the inner ring.

  The inner peripheral surface is a portion of the inner peripheral surface of the outer ring that is not chamfered, and the outer peripheral surface of the inner ring is a portion of the outer peripheral surface of the inner ring that is not chamfered. Moreover, the said outer peripheral surface of the said rolling element shall be a part which is not chamfered among the outer peripheral surfaces of a rolling element.

  According to the present invention, for example, when the inner ring receives axial force, even if the inner ring tries to move in the axial direction over a certain distance with respect to the outer ring, the annular groove of the outer ring and the rolling element The first ball disposed between the annular groove and the contact angle with the outer ring and the rolling element (the angle between the direction in which the first ball receives a load and a plane perpendicular to the central axis of the rolling bearing) The second ball disposed between the annular groove of the rolling element and the annular groove of the inner ring is in contact with the rolling element and the inner ring (first angle). Since the contact between the ball 2 receiving the load and the angle formed by the plane perpendicular to the central axis of the rolling bearing is an acute angle, the inner ring does not move more than a certain distance with respect to the outer ring. Therefore, the axial load can be reliably applied.

  Further, according to the present invention, since the inner and outer rings do not have flanges, the axial dimension of the rolling element can be set larger than that of a conventional cylindrical roller bearing, and the rolling element has a large radial load. Therefore, the radial load that can be loaded is not reduced as compared with the conventional cylindrical roller bearing.

  In addition, according to the present invention, since the inner and outer rings do not have the flange, the wear of the flange due to the rolling elements, which is a major cause of the failure of the rolling bearing for supporting the axial load, hardly occurs, and the life of the rolling bearing is prolonged. can do.

  Further, the rolling bearing of one embodiment, at least one of the outer ring and the inner ring is composed of two members that are in contact with each other in the axial direction of the outer ring. It passes through the annular groove formed by the two members.

  According to the above embodiment, since the extended surfaces of the surfaces of the two members that contact each other pass through the annular groove formed by the two members, one of the two members is assembled and a ball (first And at least one of the second balls) in the annular groove, the other of the two members can be assembled. Therefore, the above balls (at least one of the first and second balls) can be easily incorporated.

  According to the rolling bearing of the present invention, the first ball arranged between the annular groove of the outer ring and the annular groove of the rolling element, even if the inner ring tries to move in the axial direction over a certain distance with respect to the outer ring, The outer ring and the rolling element make contact with an acute contact angle, and the second ball arranged between the annular groove of the rolling element and the annular groove of the inner ring has a contact angle with the rolling element and the inner ring. Since contact is made at an acute angle, the inner ring does not move in the axial direction over a certain distance with respect to the outer ring, and an axial load can be reliably applied.

  Further, according to the rolling bearing of the present invention, since the inner and outer rings have no flanges, the axial dimension of the rolling element can be set larger than that of the conventional cylindrical roller bearing, and the rolling element is large. Since the outer peripheral surface has a shape close to a cylindrical surface on which a radial load can be applied, the radial load that can be applied is not reduced as compared with a conventional cylindrical roller bearing.

  Further, according to the rolling bearing of the present invention, since the inner and outer rings do not have the flange, the abrasion of the rolling element, which is a major cause of the failure of the rolling bearing for supporting the axial load, hardly occurs. The lifetime can be extended.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view in the axial direction showing a rolling bearing according to an embodiment of the present invention in a state where no axial load is received.

  This rolling bearing is arranged on the outer peripheral surface of the fixed-side end of a continuous casting machine driven roll (hereinafter referred to as a driven roll) (not shown), and is axial due to the radial load of the slab and the expansion due to the thermal expansion of the driven roll. It is designed to load a load. As shown in FIG. 1, the rolling bearing includes an outer ring 1, an inner ring 2, a centering ring 4, a rolling element 5, a first ball 7, and a second ball 8. The outer ring 1 has a substantially spherical outer peripheral surface, and an inner peripheral surface including two cylindrical surfaces 11 and 12 having an equal inner diameter, and an annular groove 14 positioned between the two cylindrical surfaces 11 and 12. Have The axial length of the cylindrical surface 11 and the axial length of the cylindrical surface 12 are substantially the same. The annular groove 14 extends substantially in the circumferential direction of the outer ring 1.

  The inner ring 2 has an outer peripheral surface composed of two cylindrical surfaces 16 and 17 having the same outer diameter and an annular groove 18 positioned between the two cylindrical surfaces 16 and 17, while a cylindrical inner peripheral surface. have. The axial length of the cylindrical surface 16 and the axial length of the cylindrical surface 17 are substantially the same. The inner ring 2 is fitted and fixed to the outer peripheral surface of the end of the driven roll. The inner ring 2 includes a first inner ring 21 and a second inner ring 22 that are in contact with each other in the axial direction. The annular groove 18 spans the first inner ring 21 and the second inner ring 22 such that the bottom of the annular groove 18 is substantially positioned on the contact surface between the first inner ring 21 and the second inner ring 22. Is formed. Precisely, the extended surfaces of the surfaces of the first inner ring 21 and the second inner ring 22 that come into contact with each other pass through the annular groove 18 formed by the first inner ring 21 and the second inner ring 22. ing.

  The aligning ring 4 has a substantially spherical inner peripheral surface, and has a cylindrical outer peripheral surface. The inner peripheral surface of the aligning ring 4 is in contact with the outer peripheral surface of the outer ring 1. The outer peripheral surface of the aligning ring 4 is fitted and fixed to the inner peripheral surface of a bearing box (not shown) of the continuous casting machine.

  The rolling element 5 has a substantially bowl shape, and has a shape in which an annular groove runs in the circumferential direction at the axial center of the outer peripheral surface of the cylindrical roller. Specifically, the rolling element 5 has an outer peripheral surface composed of two cylindrical surfaces 24 and 25 having the same outer diameter and axial length, and an annular groove 26 positioned between the two cylindrical surfaces 24 and 25. Have. The rolling element 5 has an annular groove 26 between the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2 such that the annular groove 26 radially faces the annular groove 14 of the outer ring 1 and the annular groove 18 of the inner ring 2. Has been placed.

  The first ball 7 is disposed over the entire area in the circumferential direction between the annular groove 14 of the outer ring 1 and the annular groove 26 of the rolling element 5, and the second ball 8 is composed of the rolling element 5. The annular groove 26 and the annular groove 18 of the inner ring 2 are disposed over the entire area in the circumferential direction. In FIG. 1, the clearance between the annular groove 14 of the outer ring 1 and the first ball 7 and the gap between the annular groove 26 of the rolling element 5 and the second ball 8 are shown in order to facilitate understanding of the action. The clearance is indicated largely.

  This rolling bearing absorbs the bending of the driven roll by tilting the outer ring 1 with respect to the aligning ring 4 when the driven roll is bent. Further, as will be described in detail later, the rolling bearing is adapted to load an axial load resulting from extension of the driven roll due to thermal expansion of the driven roll.

  FIG. 2 is a diagram showing a positional relationship among the rolling element 5, the first ball 7, and the second ball 8, and the rolling element 5, the first ball 7, and the second ball in a part of the rolling bearing. FIG. 8 is a view of FIG. FIG. 3 is a perspective view showing the positional relationship between the rolling elements 5 and the first balls 7 in a part of the rolling bearing.

  As shown in FIGS. 2 and 3, the first ball 7 disposed between the outer ring 1 and the rolling element 5 and the second ball 8 disposed between the rolling element 5 and the inner ring 2 are respectively It is in a state of being substantially in contact with both the first ball 7 or the second ball 8 located on both sides thereof. Further, the diameter of the first ball 7 is larger than the depth of the annular groove 14 of the outer ring 1, and the diameter of the second ball 8 is larger than the depth of the annular groove 18 of the inner ring 1. . From this, a part of the first ball 7 disposed between the outer ring 1 and the rolling element 5 is located outward in the radial direction of the rolling element 5, and the rolling element 5 and the inner ring 2 A part of the second ball 8 disposed therebetween is located outward in the radial direction of the inner ring 2.

  FIG. 4 is a schematic cross-sectional view in the axial direction showing the rolling bearing of the above-described embodiment in a state of receiving an axial load.

  FIG. 4 shows a case where the inner ring 2 receives an axial force indicated by an arrow A from the driven roll. When the inner ring 2 receives the above force and moves in the direction of arrow A, the axial distance between the overlapping portions of the annular groove 18 of the inner ring 2 and the annular groove 26 of the rolling element 5 decreases, and the annular groove 26 and the annular ring 26 The second ball 8 disposed between the groove 18 and the annular groove 26 and the annular groove 18 has a contact angle (a direction in which the second ball 8 receives a load and a plane perpendicular to the center axis of the rolling bearing). The contact angle is an acute angle. And the rolling element 5 moves to the moving direction of the inner ring | wheel 2, ie, the arrow A direction, via the 2nd ball | bowl 8 arrange | positioned between the annular groove 26 and the annular groove 18. FIG. As a result, the axial distance between the overlapping portions of the annular groove 14 of the outer ring 1 that cannot be moved in the axial direction and the annular groove 26 of the rolling element 5 is reduced, and the annular groove 14 and the annular groove 26 are reduced. Between the annular groove 14 and the annular groove 26 and the contact angle (the angle formed between the direction in which the first ball 7 receives a load and a plane perpendicular to the central axis of the rolling bearing). ) Makes an acute contact, and the rolling element 5 cannot move in the direction of arrow A. In this way, the outer ring 1 is interposed via the first ball 7 disposed between the annular groove 14 and the annular groove 26 and the second ball 8 disposed between the annular groove 26 and the annular groove 18. The movement of the inner ring 2 in the direction A with respect to is restricted within a certain distance. This rolling bearing is designed to apply an axial load by such a mechanism.

  According to the rolling bearing of the above embodiment, for example, when the inner ring 2 receives an axial force, even if the inner ring 2 tries to move in the axial direction over a certain distance with respect to the outer ring 1, The first ball 7 arranged between the rolling element 5 and the annular groove 26 makes contact with the outer ring 1 and the rolling element 5 such that the contact angle is an acute angle, and the annular groove 26 of the rolling element 5. Since the second ball 8 disposed between the annular ring 18 of the inner ring 2 makes contact with the rolling element 5 and the inner ring 2 such that the contact angle is an acute angle, the inner ring 2 is constant with respect to the outer ring 1. It does not move in the axial direction beyond the distance. Therefore, the axial load can be reliably applied.

  Further, according to the rolling bearing of the above embodiment, since the inner and outer rings 1 and 2 do not have flanges, the axial dimension of the rolling element 5 can be set larger than that of a conventional cylindrical roller bearing, and Since the rolling element 5 has an outer peripheral surface having a shape close to a cylindrical surface on which a large radial load can be applied, the radial load that can be applied is not reduced as compared with a conventional cylindrical roller bearing.

  Further, according to the rolling bearing of the above embodiment, since the inner and outer rings 1 and 2 do not have the flange, wear of the flange due to the rolling element 5 which is a major cause of the failure of the rolling bearing for supporting the axial load occurs. It is difficult to extend the life of the rolling bearing.

  Further, according to the rolling bearing of the above embodiment, the inner ring 2 is composed of the first inner ring 21 and the second inner ring 22, and the contact surface between the first inner ring 21 and the second inner ring 22 is extended. Since the surface passes through the annular groove 18 of the inner ring 2, after assembling one of the first inner ring 21 and the second inner ring 22 and accommodating the second ball 8 in the annular groove 18, The other of the first inner ring 21 and the second inner ring 22 can be assembled. Therefore, the second ball 8 can be easily incorporated.

  In the rolling bearing of the above embodiment, the outer peripheral surface of the outer ring 1 has a spherical shape and has the aligning ring 4 on the outer side in the radial direction of the outer ring 1, but in this invention, the outer peripheral surface of the outer ring is cylindrical. The shape does not have to have a centering ring. In this case, the outer ring may be formed of two members that are in contact with each other in the axial direction, and an annular groove may be formed on the extended surface of the contact surface of the two members. The ball may be easily incorporated into a predetermined position.

  Moreover, in the rolling bearing of the said embodiment, all the 1st balls 7 substantially contact with the two 1st balls 7 of the both sides, and all the 2nd balls 8 are the two of the both sides. Although it has come to come into substantial contact with the second ball 8, in the present invention, it is not necessary for all balls to be in contact with the two balls on both sides thereof. That is, the first ball is arranged between the groove of the outer ring and the groove of the rolling element in the number (plural) according to the specification, and the second ball is the groove of the rolling element and the groove of the inner ring. The number (plural) according to the specification may be arranged between the two.

  In the rolling bearing of the above embodiment, each of the inner and outer rings and the rolling elements 1, 2, 5 has two cylindrical surfaces 11, 12, 16, 17, 24, 25 and one annular groove 14, 18, 26. However, in this invention, the inner and outer rings and the rolling element have three or more cylindrical surfaces and two or more annular grooves positioned between the three or more cylindrical surfaces. May be.

  In the rolling bearing of the above embodiment, as shown in FIG. 1, the cross-sectional shapes of the inner and outer rings and the grooves 14, 18 and 26 of the rolling elements 1, 2 and 5 are semicircular, The cross-sectional shape of the rolling element may be a shape other than a semicircular shape such as a semi-elliptical shape or a dish shape.

It is a schematic cross section of the axial direction which shows the rolling bearing of one Embodiment of this invention of the state which has not received the axial load. It is the figure which looked at the rolling element, the 1st ball, and the 2nd ball from the axial direction. It is a perspective view which shows the positional relationship of a rolling element and a 1st ball. It is a schematic cross section of the axial direction which shows the rolling bearing of the said embodiment of the state which has received the axial load.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 4 Centering ring 5 Rolling element 7 First ball 8 Second ball 11, 12, 16, 17, 24, 25 Cylindrical surface 14, 18, 26 Annular groove 21 First inner ring 22 Second Inner ring

Claims (2)

An outer ring having an inner circumferential surface composed of a plurality of cylindrical surfaces and an annular groove between the plurality of cylindrical surfaces;
An inner ring whose outer peripheral surface is composed of a plurality of cylindrical surfaces and an annular groove between the plurality of cylindrical surfaces;
The outer peripheral surface is composed of a plurality of cylindrical surfaces and an annular groove between the plurality of cylindrical surfaces, and a rolling element disposed between the inner peripheral surface and the outer peripheral surface of the inner ring,
A plurality of first balls disposed between the annular groove of the outer ring and the annular groove of the rolling element;
A rolling bearing, comprising: a plurality of second balls arranged between the annular groove of the rolling element and the annular groove of the inner ring. The rolling bearing according to claim 1,
At least one of the outer ring and the inner ring is composed of two members that abut in the axial direction of the outer ring,
The rolling bearing according to claim 1, wherein an extended surface of the surfaces of the two members contacting each other passes through the annular groove formed by the two members.

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