JP2004245392A - Pin type holder for rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pin type holder using a bush, having high strength, and capable of facilitating assembly and loosening dimensional precision of a member. <P>SOLUTION: In this pin type holder A, a first annular plate 4 and a second annular plate 3 arranged in parallel for each other using the same rotary shaft are mutually connected by a plurality of pins 1. The bush 8 is pressed in between an outer peripheral face in at least an end part on one side of each pin 1 and an inner peripheral face of a pin receive hole 6 of the first annular plate 4 in which the end part is inserted. Recessed and projecting parts deformable when pressing in are formed on an outer peripheral face of the bush 8. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a so-called pin-type cage provided in a roller bearing.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, cylindrical roller bearings and tapered roller bearings having a large load capacity have been used as rolling bearings used particularly in equipment having a large load load and vibration. In such a bearing, a pin-type cage having a structure in which a hole concentric with the rotation axis of the roller is provided in the roller and a pin is passed through the hole is used. An example of this conventional pin type cage will be described with reference to the drawings. In this conventional example, as shown in FIG. 6, the other end 11 of the pin 1 is fixed by screwing it into a screw hole 5 provided in the second annular plate 3 or the like. It is inserted into a pin receiving hole 6 of the first annular portion 4 provided at a position corresponding to the screw hole 5, and is fixed to the first annular portion 4 by a welding material 7. The diameter of the pin receiving hole 6 is the same as the outer diameter of the pin 1 (the outer diameter of the portion inserted into the pin receiving hole 6) or the inner diameter of the pin receiving hole 6 for adjusting the assembly. A minute gap X was provided between the pin 1 and the outer peripheral surface. Therefore, depending on the use conditions of the bearing, a stress such as a large bending moment acts on the pin 1, and stress concentrates on a welding portion between the pin 1 and the welding material 7 having a relatively low joining strength. Could occur. In order to solve this problem, as another conventional example, a bush is press-fitted between the inner peripheral surface of the pin receiving hole 6 of the first annular portion 4 and the outer peripheral surface of the pin 1 to reduce the minute gap X. A method has been adopted in which the stress is not applied to the welded portion by eliminating the stress (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 6-13381 (Page 1-2, Figure 5-6)
[0004]
[Problems to be solved by the invention]
In order to increase the strength of the retainer, it is effective to use a bush as described above. However, when using a bush, it is necessary to set an appropriate interference (press-fitting allowance) both between the pin and the bush and between the bush and the annular plate pin receiving hole. Extremely high dimensional accuracy is required for the outer diameter and inner diameter of the ring and the diameter of the pin receiving hole of the annular plate. However, since it is actually difficult to secure this dimensional accuracy, the bush may not be press-fitted, or even if press-fitting may be performed, the pressing force may become extremely large. Therefore, it is difficult to assemble the cage, and much labor is required.
[0005]
The present invention has been made in view of such a problem, and in a cage using a bush, it is possible to provide a pin-type cage that is easy to assemble, can reduce dimensional accuracy of members, and has higher strength. The purpose is to:
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a first annular plate and a second annular plate which are arranged in parallel to each other and have the same rotation axis, are connected by a plurality of pins, and at least one of the pins is provided. In a pin type retainer for a rolling bearing, in which a bush is press-fitted between an outer peripheral surface of an end portion and an inner peripheral surface of a pin receiving hole of an annular plate passing through the end portion, the outer peripheral surface of the bush is deformed during the press-fitting. A pin type retainer for a rolling bearing, wherein a possible uneven portion is formed. With this configuration, when the bush is press-fitted, the convex portion of the uneven portion provided on the outer peripheral surface of the bush can be crushed and escaped to the concave portion, so that the bush can be tightly fitted without requiring high dimensional accuracy. be able to. In addition, since the convex portion gets into the inner peripheral surface of the pin receiving hole, the bite effectively prevents the annular plate from coming off.
[0007]
The uneven portion is formed by a groove provided along a direction at an angle to the axial direction of the pin, and is formed by the outer peripheral surface and a side wall of the groove in an axial cross section of the bush. The edge angle, which is an angle, may be configured such that the edge angle on the outer side in the axial direction is more acute than the edge angle on the inner side in the axial direction. By doing so, the penetration of the edge of the groove in the direction in which the annular plate comes off acts more effectively as a resistance, so that the annular plate is more effectively prevented from coming off.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged sectional view of a portion of a pin 1 of a pin type retainer A according to the present embodiment, FIG. 2 is a side view of a bush 8, and FIG. 3 is a perspective view of the entire retainer A. As shown in FIG. 3, the retainer A includes a first annular plate 4 and a second annular plate 3 which are arranged in parallel to each other and have the same rotation axis, and are arranged to face each other at a distance L. It is configured to be connected by a plurality of pins 1 provided between the plates and provided at equal intervals in the circumferential direction.
[0009]
As shown in FIG. 1, each of the pins 1 has one end 12 and the first annular plate 4 welded to each other by a welding material 7. The other end 11 of the pin 1 is provided with a male screw portion 11a. The other end 11 is screwed into a screw hole 5 provided in the second annular portion 3 to form a second annular portion. It is fixed to the plate 3. The structure of the other end 11 is the same as the conventional example. As shown by a virtual line in FIG. 1, the cylindrical roller 9 is a hollow roller provided with a hole concentric with the rotation axis thereof. The retainer A is used to hold the hollow roller, and the pin 1 is inserted into the hole of the hollow roller to rotatably support the cylindrical roller 9 which is a hollow roller around an intermediate portion of the pin 1. .
[0010]
The first annular plate 4 is provided with a pin receiving hole 6 for holding one end 12 of a pin at a position facing the screw hole 5 of the second annular plate 3. It is inserted through the receiving hole 6. The bush 8 is press-fitted between the outer peripheral surface of the one end 12 of the pin 1 and the inner peripheral surface of the pin receiving hole 6 of the first annular plate 4 passing through the one end 12. That is, the bush 8 fits on the outer peripheral surface of the one end 12 of the pin 1 and also fits on the inner peripheral surface of the pin receiving hole 6 provided in the first annular plate 4. Further, the end face 12 a of the one end 12 of the pin 1, the axially outer end face 8 a of the bush 8, and the inner peripheral face 6 a of the pin receiving hole 6 toward the axial outside are welded by the welding material 7. . Therefore, the pin 1 is fixed by being fitted into the pin receiving hole 6 of the first annular plate 4 via the bush 8 and is also joined to the first annular plate 4 by welding.
[0011]
As shown in FIG. 2, the bush 8 has a cylindrical outer shape and a pipe shape in which an inner peripheral surface is formed by a hole concentric with the cylindrical shape. On the outer peripheral surface of the bush 8, there is provided a spiral groove 8 b in which the center axis of the spiral is the same as the axis of the bush 8. The spiral groove 8b extends along a direction whose longitudinal direction is not parallel to the axis, that is, along a direction having a predetermined angle α (see FIG. 2) with respect to the axis, and on the outer peripheral surface. Are provided at substantially equal pitches P. FIG. 4 is an enlarged cross-sectional view of the groove, and the cross-sectional shape of the groove is substantially triangular. Therefore, on the outer peripheral surface of the bush 8, an uneven portion is formed in which the groove portion 8b is a concave portion and the portion 8c other than the groove portion 8b is a convex portion. The boundary between the groove 8b and the protrusion 8c is an edge 8d which is an opening edge of the groove 8b.
[0012]
As shown in FIGS. 1 and 2, the bush outer fitting portion 12b of the one end portion 12 of the pin 1 where the bush 8 fits outside does not have a taper, and the generatrix is a column parallel to the axis. It has a shape. The inner and outer peripheral surfaces of the bush 8 have no taper shape corresponding to the shape of the bush outer fitting portion 12b, and the bush 8 has a cylindrical shape. Similarly, the pin receiving hole 6 of the first annular plate 4 is also a cylindrical hole without a taper corresponding to the shape of the outer peripheral surface of the bush 8.
[0013]
To manufacture the pin type retainer A of the present embodiment, first, the male screw portion 11a of the other end portion 11 of the pin 1 is screwed into the screw hole 5 of the second annular portion 3 and screwed. Then, the one end 12 of the pin 1 is inserted into the pin receiving hole 6 of the first annular portion 4 (see FIG. 1). Thereafter, the bush 8 is press-fitted between the inner peripheral surface of the pin receiving hole 6 and the outer peripheral surface of the one end 12 of the pin 1. Lastly, welding is performed, and the end surface 12a of the one end portion 12 of the pin 1, the end surface 8a of the bush 8 on the outside in the axial direction, and the inner periphery of the pin receiving hole 6 on the outside in the axial direction via the welding material 7. The surface 6a is fused and joined. In the present invention, the fixing method for fixing the other end portion 11 to the second annular portion 3 is not particularly limited. For example, the other end portion 11 may be fixed by welding or the same method as the one end portion 12. Further, it is preferable that the bush 8 be made of a metal material that can be welded to the pin 1 or the first annular body 4 because it can be firmly joined by welding.
[0014]
According to the retainer A of this embodiment, since the uneven portion is provided on the outer surface of the bush 8, when the bush 8 is press-fitted, the convex portion of the bush 8 can be crushed and escape to the concave portion. Therefore, the bush 8 can be smoothly pressed in even when the dimensional accuracy is relatively low as compared with the case where the uneven portion is not provided. Therefore, the use of the bush 8 facilitates the production process of the high-strength pin-type cage, improves the productivity, and reduces the production cost.
[0015]
Also, in order to improve the strength of the retainer by press-fitting the bush 8, an appropriate press-in allowance (interference) is provided on the outer diameter and the inner diameter of the bush 8, and the bush 8 is attached to the one end 12 of the pin 1. It is necessary to fit the outer peripheral surface to the outer periphery with an appropriate pressure and to fit the inner peripheral surface of the pin receiving hole 6 provided in the first annular plate 4 with the appropriate pressure. For this purpose, the inner and outer diameters of the bush 8, the roundness and eccentricity of the cross section of the inner and outer peripheral surfaces of the bush 8, the outer diameter and the roundness and eccentricity of the cross section of the pin 1, and also the pin receiving hole A high degree of dimensional accuracy is required for the inner diameter and roundness of the cross section of No. 6. Therefore, even if there is a slight deviation in dimensional accuracy, they act synergistically and become apparent, making it impossible to press-fit the bush 8, the pressing force at the time of press-fitting becomes excessive, or a gap is formed. Resulting in. According to the present invention, since the convex portion of the bush 8 can be crushed and escape to the concave portion, the error can be absorbed even if the dimensional accuracy is relatively low, and the burden of the dimensional accuracy of each member as described above can be reduced. The bush 8 can be tightly fitted without requiring high dimensional accuracy. Accordingly, stress such as a bending moment applied to the pin 1 does not concentrate on the welded portion, and the stress can be dispersed at the contact portion between the bush 8 and the pin 1, so that the strength of the retainer A can be improved. In addition, since the convex portion gets into the inner peripheral surface of the pin receiving hole, the bite effectively prevents the annular plate from coming off.
[0016]
As described above, the bush outer fitting portion 12b on which the bush 8 is externally fitted on the outer peripheral surface of the end of the pin 1 has a cylindrical shape whose generatrix is parallel to the axis. In the case of such a shape, the bush comes off in the axial direction outward as compared with the case where the bush outer fitting portion 12b is formed in a tapered shape (a tapered shape in which the diameter is reduced toward the end of the pin 1). Since there is no taper that makes the bushing easier, the bush is less likely to come off in the axial direction.
[0017]
The uneven portion on the outer peripheral surface of the bush used in the present invention is not limited to the case where the uneven portion is formed by providing a spiral groove as in the embodiment, and has an uneven portion which can be deformed at the time of press-fitting the bush. Just do it. In this case, the depth of the concave portion, that is, the depth from the uppermost point of the convex portion to the lowermost point of the concave portion is determined by the depth of the concave and convex portions on the outer peripheral surface of the conventional bush, that is, the conventional bush 8 which has been cut. It is necessary to make it deeper than the depth of the unevenness of the cut surface. For example, if the outer peripheral surface of the bush 8 has a deeper unevenness (rough surface roughness) than the cut surface of the conventional product, for example, the uneven surface is provided by shot peening, even if the uneven surface is fine, Good.
[0018]
It is preferable to provide an annular groove on the outer peripheral surface of the bush as a method of providing the uneven portion, since the work of providing the uneven portion is relatively easy. Further, when the spiral groove is provided as in the present embodiment, the formation of the groove is further facilitated, and the manufacture of the bush 8 is further facilitated. As a processing method of the groove portion, cutting is preferable because processing is simple.
[0019]
In the case of forming the unevenness by the groove, an angle (an angle in an image projected on a plane parallel to the axis) between the axial direction of the pin 1 (the direction of the axis of the bush 8) and the longitudinal direction of the groove is α (see FIG. 2). Preferably, it is not 0 degrees. That is, it is preferable that the groove is provided not parallel to the axial direction of the pin 1 but at an angle. In this way, when the first annular plate 4 is to be pulled out in the axial direction, the edge 8 d of the groove 8 b is more effectively inserted into the inner peripheral surface of the pin receiving hole 6 of the first annular plate 4, and the removal resistance is reduced. Therefore, the detachment can be effectively prevented. In order to further enhance the physical locking effect of the edge 8d, it is preferable that the angle β (see FIG. 4) formed by both sides of the groove cross-sectional profile in the groove 8b having a substantially triangular cross-section is, for example, about 60 degrees. If this angle is too small, the groove width W becomes too small, and the space for digging is reduced, so that the drag due to digging may decrease. If this angle is too large, the edge angles θ1 and θ2 Becomes an obtuse angle, and the penetration tends to be reduced.
[0020]
FIG. 5 is a modification of the above embodiment, and differs from the above embodiment only in the cross-sectional shape of the groove 8b. Here, the triangle in the cross-sectional shape of the groove 8b is not an isosceles triangle as in the embodiment shown in FIG. 4, but two sides including the oblique sides of a substantially right triangle form the cross-sectional shape of the groove. Therefore, the edge angle, which is the cross-sectional angle between the outer peripheral surface of the bush 8 and the groove 8b, is sharper at the edge angle θ1 on the outer side in the axial direction than the edge angle θ2 on the inner side in the axial direction. When the first annular plate 4 is to be pulled out in the axial direction, the edge 8d1 on the axially outer side is not the edge 8d2 on the inner side in the axial direction, but the edge 8d1 on the outer side in the axial direction. Increases the physical locking effect. Therefore, by making the edge angle θ1 on the outer side in the axial direction more acute angle than the edge angle θ2 on the inner side in the axial direction, it is possible to further enhance the detachment prevention effect.
[0021]
In this case, the edge angle θ1 on the outer side in the axial direction is preferably set to, for example, an angle in the vicinity of about 90 degrees. If the edge angle θ1 is large, the effect of the acute angle decreases, and if the edge angle θ1 is small, machining of the groove tends to be difficult, and the edge tends to be chipped. In addition, the cross-sectional shape of the groove may be, for example, a substantially rectangular square groove or the like, instead of being substantially triangular. In this case, the edge angle θ2 on the axially inner side and the edge angle θ1 on the axially outer side may be used. In any case, the angle can be relatively acute, such as about 90 degrees.
[0022]
In addition, as described above, the convex portion can be crushed by the concave / convex portion to escape to the concave portion, and an effect such as relaxation of dimensional accuracy can be obtained. However, in order to further enhance this effect, the relative position of the concave portion and the convex portion is required. It is preferable to consider the proportion. From this viewpoint, when a groove is provided on the surface of the bush, the groove width W and pitch P (see FIG. 4) can be appropriately selected according to interference.
[0023]
【The invention's effect】
As described above, according to the present invention, in a cage using a bush, it is possible to provide a pin-type cage that is easy to assemble, can reduce dimensional accuracy of members, and has higher strength.
[Brief description of the drawings]
FIG. 1 is an enlarged sectional view of a pin portion of a pin type retainer according to an embodiment of the present invention.
FIG. 2 is a partially cutaway view of a bush in the pin type cage according to the embodiment of the present invention.
FIG. 3 is a perspective view of a pin type retainer according to the embodiment of the present invention.
FIG. 4 is a sectional view of a groove of the bush of FIG. 2;
FIG. 5 is a cross-sectional view of a groove of a bush in a pin type retainer according to another embodiment of the present invention.
FIG. 6 is an enlarged sectional view of a pin portion of a conventional pin type cage.
[Explanation of symbols]
1 Pin 11 Other end 11a of pin 11 Male thread 12 One end 12a of pin 12b End face 12b Bush outer fitting part 3 Second annular plate 4 First annular plate 5 Screw hole 6 Pin receiving hole 6a Inner peripheral surface toward axially outward Reference Signs List 8 bush 8a axially outer end face 8b of bush groove 8c convex portion 8d edge 8d1 axially outward edge 8d2 axially inward edge 9 virtual line P of cylindrical roller P pitch W groove width α bush axis The angle between the two sides of the groove. The angle θ1 between the two sides of the groove. The edge angle θ2 on the outer side in the axial direction.

Claims (2)

The first annular plate and the second annular plate, which are arranged in parallel with each other and have the same rotation axis, are connected by a plurality of pins, and the outer peripheral surface of at least one end of each pin and this end are inserted. In the pin type retainer for a rolling bearing, in which a bush is press-fitted between the pin plate and the inner peripheral surface of the pin receiving hole of the annular plate,
A pin type retainer for a rolling bearing, wherein an uneven portion which is deformable at the time of the press-fitting is formed on an outer peripheral surface of the bush. The uneven portion is formed by a groove provided along a direction at an angle to the axial direction of the pin, and at an angle formed by the outer peripheral surface and a side wall of the groove in an axial cross section of the bush. The pin type cage for a rolling bearing according to claim 1, wherein the certain edge angle is such that an edge angle on an axially outer side is more acute than an edge angle on an axially inner side.

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