JP2020122491A - Two-split holder and bearing comprising the same - Google Patents

Abstract

To provide a two-split holder for a bearing suitable to prevent rattling between holder bodies, with a simple constitution.SOLUTION: In a two-split holder for a bearing, each of circumferential end surfaces, which is the combined surface of each holder body, has a projecting end part that projects in a circumferential direction, the projecting end part is formed by a crimping process of crimping the circumferential end surface from the radial outside to the radial inside, and a one-side projecting end part projecting to one side in the circumferential direction in one of the holder bodies and the other-side projecting end part projecting to the other side in the circumferential direction in the other of the holder bodies are brought into contact with each other to be combined.SELECTED DRAWING: Figure 1

Description

The present invention relates to a split cage and a roller bearing including the split cage.

For example, as shown in FIG. 8, a roller bearing 100 that supports a rotating shaft 2 such as a camshaft or a crankshaft of an engine has a predetermined position in the axial direction due to a step portion being formed on the rotating shaft 2. It may not be possible to insert it into. In that case, for example, as shown in Patent Document 1, a roller bearing having two cages is adopted. The cage of Patent Document 1 is a combination of semicircular cage bodies (hereinafter referred to as cage bodies) cut in two in the circumferential direction, butted together at their end faces to form a cage.

When forming the retainer body, it is necessary to cut one annular member into two, but a machining allowance corresponding to the thickness of the cutter used for the cutting is required. Therefore, if the cut end faces of the retainer body are made to face each other and are combined in an annular shape, a gap is created between the end faces of the retainer body by the margin.

It may be possible to cut at a position displaced from the center of the annular member by the allowance in order to obtain a retainer body with a semicircular shape, but retain the remaining pieces separated from the retainer body with a semicircular shape. It cannot be used as a body. Therefore, two annular members are required to obtain the pair of cage bodies, which is a cost problem.

Therefore, for example, in Patent Document 2, a coating material having a predetermined thickness is applied to at least one of the opposing end faces in the circumferential direction of the pair of semicircular holding members divided into two. The coating material compensates for the decrease in the circumferential length due to the cutting allowance, thereby preventing the cage from rattling.

JP, 2013-2574, A Japanese Utility Model Publication No. 6-6746

In the configuration shown in Patent Document 2, since it is necessary to prepare a coating material for applying to the end surface of the semi-annular holding member and then apply the coating material, the material cost and the work cost increase. There is. Further, if the coating material adheres to the pillars or the like forming the pockets of the cage, there is a possibility that the pocket clearance may be reduced. If the masking work is performed to eliminate this problem, more labor is required, which further increases the cost of the roller bearing.

Therefore, an object of the present invention is to provide a suitable two-part cage for a roller bearing, which has an inexpensive structure and prevents rattling between cage bodies.

In order to solve the above-mentioned problems, in the present invention, a pair of semi-annular retainer bodies each having a split shape is combined in an annular shape, and the retainer body has a pocket for accommodating rollers. In the two-split cage provided with, each of the circumferential end surfaces that are the combined surfaces of the cage bodies has a projecting end portion that projects in the circumferential direction, and the projecting end portion is the circumferential end surface. Is formed by a caulking process for crimping from the outside in the radial direction to the inside in the radial direction, and one side projecting end portion protruding to one side in the circumferential direction of one of the cage bodies and the other cage body A two-way split cage is configured in which the other side projecting end portion projecting to the other side in the circumferential direction abuts and is combined.

In this way, after forming the projecting end portion on the circumferential end portion of the cage body, by combining a pair of semi-annular cage bodies in the circumferential direction, the size of the gap between the cage bodies can be increased. Can be made smaller than the size of the machining allowance due to cutting, and rattling between both holder bodies can be suppressed. For this reason, it is possible to prevent problems caused on the end surface and the column portion of the cage body due to the rattling.

Further, since the protruding end is formed by caulking, no additional member is required to form the protruding end. Therefore, the manufacturing cost can be suppressed.

In the above configuration, a gap is provided between the one retainer body and the other retainer body on the radially inner side of the region where the one-side protruding end portion and the other-side protruding end portion are in contact with each other. The gaps may be opposed to each other and may be a reservoir of lubricating oil.

Since the lubricating oil sump can be formed by simply abutting the protruding ends, no additional processing is required to form the lubricating oil sump. Therefore, the manufacturing cost can be suppressed.

Further, in a roller bearing including a plurality of rollers and a cage that holds the rollers, the cage may be a split cage according to each of the above configurations.

Advantageous Effects of Invention According to the present invention, it is possible to provide a suitable two-part cage for a roller bearing, which has an inexpensive structure and prevents rattling between cage bodies.

Sectional drawing which shows the usage example of the roller bearing which concerns on this invention. Side view of the split cage shown in FIG. Side view showing a state in which the annular member is cut Sectional drawing which follows the IV-IV line in FIG. Sectional drawing which follows the VV line in FIG. It is a side view which shows the principal part of the split cage shown in FIG. 2, (a) before formation of a protrusion end, (b) after formation of a protrusion end. It is a side view which shows the modification of the principal part of the split cage shown in FIG. 2, (a) before formation of a protrusion end, (b) after formation of a protrusion end. Side view showing an example of a state in which a roller bearing is attached to a rotating shaft

A usage example of the roller bearing 1 according to the present invention is shown in FIG. In the following description, a direction parallel to the rotation axis of the roller bearing 1 is referred to as an axial direction, a direction orthogonal to the rotation axis is referred to as a radial direction, and a direction along an arc centered on the rotation axis is referred to as a circumferential direction. Further, in each of the following drawings, the upper and lower sides are defined as shown.

The roller bearing 1 includes a split cage 5, rollers 6, and a split outer ring 7. The roller bearing 1 may be a roller bearing with a cage that does not have the split outer ring 7. The split holder 5 is provided in the housing 3 in which the upper housing 3a and the lower housing 3b are integrated by bolts 4.

An embodiment of the split holder 5 according to the present invention will be described with reference to FIGS. 2 to 6. As shown in FIGS. 3 and 4, the halved cage 5 has a pair of semi-annular cage bodies 11 and 11 that are halved by cutting a circular annular member with a cutter. It has a configuration in which end faces of the split portion are opposed to each other and are combined in an annular shape.

In the state where the annular member remains cut, when the end faces of the pair of cage bodies 11, 11 are made to face each other into an annular shape, a gap g ₀ (corresponding to the wall thickness of the cutter is provided between the end faces. (See FIG. 3) has occurred. Therefore, as shown in FIGS. 2 and 5, after cutting the annular member, a projecting end portion 14 projecting in the circumferential direction is provided on the circumferential end surface 11a which is a combined surface of the cage body 11. The projecting end portions 14 are butted against the projecting end portions 14 of the pair of other cage bodies 11. With this configuration, when the pair of cage bodies 11, 11 are combined into an annular shape, the circumferential gap between the cage bodies 11, 11 is eliminated, and rattling between the cage bodies 11, 11 is prevented. Can be suppressed. For this reason, it is possible to prevent problems that may occur on the end surface of the cage body 11 or the column portion 9.

As shown in FIG. 6A, the protruding end portion 14 is located on the outer radial side of the radial center of the circumferential end portion of the retainer body 11 in the radial direction of the retainer body 11 (see FIG. 6A). 6 (b) in which the outer diameter side is projected outward in the circumferential direction of the cage body 11, as shown in FIG. 6B. Formed by.

Further, when the annular member is cut by a cutter, a burr-shaped edge is formed on the cut surface, which may hinder the oil film formation of the housing 3. For this reason, normally, after cutting the annular member, a chamfering step for removing the edge formed on the cut surface is essential. On the other hand, by performing the caulking process for forming the protruding end portion 14 as described above, the edge is removed at the same time when the protruding end portion 14 is formed, and the chamfering process becomes unnecessary, which increases the work cost. Can be suppressed.

The retainer body 11 has a plurality of pockets 8 for accommodating the rollers 6 and a column portion 9 provided between the adjacent pockets 8. The pocket 8 is formed with a drop-out preventing portion (not shown) so that the roller 6 does not drop inward in the radial direction of the bearing. In the case where the roller bearing 1 is a roller bearing with a retainer that does not include the split outer ring 7, a fall prevention portion may be provided also on the radially outer side of the pocket 8. It should be noted that the drop-out prevention portion may not be provided.

As shown in FIG. 1, the split outer ring 7 has a cylindrical outer shape by abutting the respective circumferential ends of the upper outer ring 7a and the lower outer ring 7b. Positioning projections 12 are formed on the upper outer ring 7a and the lower outer ring 7b so as to project radially outward. The positioning protrusion 12 is inserted into positioning holes 13 formed in the upper housing 3a and the lower housing 3b, respectively. This prevents the split outer ring 7 from rotating with respect to the housing 3. A rotary shaft 2 is inserted into the inner circumference of the roller bearing 1 so as to be rotatable around the shaft.

In this embodiment, the protruding end portions 14, 14 formed on the pair of cage bodies 11, 11 are in contact with each other, but a structure having a gap between both protruding end portions 14, 14 is also acceptable. To be done. Also in this case, the circumferential gap between the pair of cage bodies 11, 11 can be narrowed as compared with the case where the projecting end portion 14 is not formed (see FIG. 3 ), so that both cage bodies 11, 11 can be closed. This is because the effect of reducing rattling is exhibited.

The amount of protrusion of the protruding end portion 14 is not particularly limited, but the amount of protrusion of the halved cage 5 formed by the cage bodies 11, 11 abutted in the circumferential direction does not deviate from a perfect circle. The range must be specified.

A pair of cage bodies 11 are opposed to each other with a gap 15 provided on the inner side in the radial direction of the region where the pair of projecting end portions 14, 14 are in contact with each other. The gap 15 is a lubricating oil reservoir 15 extending in the radial direction. Specifically, at the abutting portions of the projecting end portions 14 and 14 formed on the pair of cage bodies 11 and 11, respectively, a groove-like lubricating oil reservoir 15 extending in the radial direction is formed so as to be adjacent to the abutting portions. Has been formed.

By doing so, the lubricating oil that moves radially outward by the centrifugal force that accompanies the rotation of the split cage 5 enters the lubricating oil sump 15, and the lubricating oil retained in this lubricating oil sump 15 is used as a bearing component. Can be stably supplied to. In addition, since the lubricating oil sump 15 is simply formed by abutting the protruding end portions 14, the additional processing for forming the lubricating oil sump 15 is not required. Therefore, the manufacturing cost can be suppressed.

A modification of the split holder 5 according to the present invention is shown in FIG. In the two-divided cage 5 shown in FIG. 2, the projecting end portion 14 is formed on the outer diameter side with respect to the radial center of the circumferential end portion of the cage body 11. In the container 5, the protruding end portion 14 is formed on the inner diameter side with respect to the radial center of the circumferential end portion of the retainer body 11. Even in this case, the protruding end portions 14 come into contact with each other in the circumferential direction to eliminate the circumferential gap between the cage bodies 11 and 11, thereby suppressing the rattling between the cage bodies 11 and 11. it can. Similar to the above, a configuration having a gap between the projecting end portions 14 and 14 is also allowed.

In this modification, a lubricant oil reservoir 15 extending in the radial direction is formed on the outer diameter side of the projecting end portion 14. Even in this case, since a predetermined amount of lubricating oil can be retained in the lubricating oil sump 15, the lubricating oil can be stably supplied to the bearing component parts.

The roller bearing 1 and the two-split cage 5 shown in the above embodiment are merely examples, and have a simple structure to reduce the gap between the end faces of the cage body 11 to suppress rattling. As long as the problem of the invention can be solved, it is permissible to appropriately change the shape of the protruding end portion 14, the shape, the number, the arrangement, etc. of the pocket 8 and the pillar portion 9 of the retainer body 11.

For example, in the above, the projecting end portions 14 are formed at the respective end portions of the pair of cage bodies 11, 11, but only the end portion of one cage body 11 of the pair of cage bodies 11, 11. The protruding end portion 14 may be formed. Further, in the above, the protruding end portion 14 is formed by crimping the end portion of the retainer body 11, but the protruding end portion 14 which is a separate member is fixed to the end portion of the retainer body 11. Can also Further, in the above description, the configuration in which the split holder 5 is divided into two has been shown, but the number of divisions may be changed in some cases.

1 Roller Bearing 5 2 Split Cage 6 Roller 8 Pocket 9 Column 10 Ring Member 11 Cage 14 Protruding End 15 Gap (Lubricant Oil Reservoir)

Claims (3)

It is configured by combining a pair of semi-annular retainer bodies each having a split shape in an annular shape,
In the split cage, wherein the cage body is provided with a pocket for accommodating rollers,
Each of the circumferential end surfaces, which is a combined surface of the respective cage bodies, has a projecting end portion that projects in the circumferential direction,
The projecting end portion is formed by crimping the circumferential end surface from the radial outside to the radial inside,
One of the retainer bodies, which protrudes to one side in the circumferential direction, and the other projecting end portion of the other retainer body, which projects to the other side in the circumferential direction, are brought into contact with each other to be combined. It is a split cage. On the radially inner side of the region where the one side protruding end portion and the other side protruding end portion are in contact with each other, the one retainer body and the other retainer body are opposed to each other with a gap provided,
The split cage according to claim 1, wherein the gap is a reservoir of lubricating oil. Multiple times,
A cage for holding the rollers,
The roller bearing, wherein the cage is the split cage according to claim 1.

Images