JP2015017690A - Raceway ring of thrust roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a raceway ring of a thrust roller bearing that can properly bear a thrust load.SOLUTION: A raceway ring (11) of a thrust roller bearing has a plate-like shape and is provided in the thrust roller bearing (31), and provided with a raceway surface (18) for rolling needle-like rollers (13) on a face (22) on one side in a plate thickness direction. The face (22) on the one side in the plate thickness direction is provided with a swollen part (23) which has its top surface curved and swollen to the side of a rolling surface (17) for the needle-like rollers (13), and a face (27) of the another side in the plate thickness direction is flat.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing ring for a thrust roller bearing (hereinafter sometimes simply referred to as a “race ring”), and in particular, a bearing for a thrust roller bearing used in an automobile transmission, a torque converter, and a car air conditioner compressor. It is about the wheel.

  For example, a thrust roller bearing that receives a thrust load is disposed at a location where a thrust load is applied in an automobile transmission, a torque converter, a car air conditioner compressor, or the like. The thrust roller bearing includes a bearing ring disposed in the rotation axis direction, a plurality of rollers that roll on the raceway surface of the bearing ring, and a cage that holds the plurality of rollers.

  As for the thrust roller bearing, Japanese Patent Application Laid-Open No. 2003-83333 (Patent Document 1), Japanese Patent No. 3628033 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2012-7709 (Patent Document 3) are known. ).

JP 2003-83333 A Japanese Patent No. 3628033 JP 2012-7709 A

  When a biased load is applied to the thrust roller bearing, the contact portion between the roller and the bearing ring, specifically, the corner portion formed between the rolling surface and the end surface of the roller, There is a possibility that a so-called edge load may occur at a contact portion between the raceway and the raceway surface. In addition, thrust roller bearings are required to reduce rotational torque when the bearing is in operation. One of the main factors generating this rotational torque is the difference in the peripheral speed between the inner and outer peripheral sides of the roller. There is a differential slip due to. This reduction of differential slip is also a problem to be overcome in the thrust roller bearing.

  According to Patent Document 1, the needle roller included in the thrust roller bearing is provided with a full crowning so as to reduce so-called differential slip. However, it is not preferable to provide full crowning on the needle rollers because this increases the cost.

  Further, according to Patent Document 2 and Patent Document 3, in the race of the thrust roller bearing, that is, in the raceway, the cross-sectional shape of the raceway surface is reduced in diameter for the purpose of suppressing the occurrence of edge load and reducing differential slip. It is assumed that the direction middle part is a convex arc shape that swells toward each roller. According to Patent Document 2 and Patent Document 3, a race formed of a plate-like member has a shape inflated into a convex arc shape so as to push a surface opposite to the raceway surface in a cross-sectional shape.

  However, the thrust roller bearings having the shapes shown in Patent Document 2 and Patent Document 3 may be insufficient in terms of bearing rigidity. That is, when the thrust roller bearing is installed in a housing or the like, there is a gap between the surface of the raceway opposite to the raceway surface and the housing to which the raceway is attached. Then, when a load is applied in the thrust direction, the race may be bent inappropriately. In such a situation, the thrust load cannot be properly received.

  An object of the present invention is to provide a bearing ring for a thrust roller bearing that can appropriately receive a thrust load.

  A bearing ring of a thrust roller bearing according to the present invention is provided in the thrust roller bearing and is a plate-shaped thrust roller bearing provided with a raceway surface that rolls the roller on one surface in the plate thickness direction. It is a raceway, and the surface on one side in the plate thickness direction is formed of a curved surface, and a bulging portion that bulges on the rolling surface side of the roller is provided. The other side is flat.

  According to such a configuration, in the raceway ring of the thrust roller bearing, the surface on one side in the plate thickness direction is configured with a curved surface, and the bulging portion that bulges toward the rolling surface side of the roller is provided. Is provided. Therefore, even when the roller rolling on the raceway surface, specifically, the roller rolling surface is not provided with a crowning, the occurrence of edge load is suppressed when an eccentric load is applied to the thrust roller bearing. be able to. In addition, the differential slip can be reduced. In this case, since the surface on the other side in the plate thickness direction is flat, the surface of the bearing ring opposite to the raceway surface and the bearing ring are attached to the housing to which the bearing ring of the thrust roller bearing is attached. There is no gap between the housing. Then, when a thrust load is applied to the thrust roller bearing, the race ring does not bend. Therefore, the thrust load can be appropriately received.

  In addition, on one surface in the plate thickness direction, the first flat portion, which is located on the inner diameter side of the bulging portion and the surface is flat, and the outer diameter side of the bulging portion, the surface is You may comprise so that the 2nd flat part which is flat may be provided.

  Moreover, you may comprise so that the bulging part may be connected smoothly with the 1st flat part and the 2nd flat part.

  Moreover, when cut | disconnected in the plane along a plate | board thickness direction, you may comprise a bulging part so that a cross-sectional arc shape may be sufficient.

  Moreover, you may comprise a bulging part so that it may be a crowning shape.

  Moreover, you may comprise so that the collar part extended in a plate | board thickness direction from at least any one side of an outer diameter side edge part and an inner diameter side edge part may be provided.

  According to such a configuration, in the raceway ring of the thrust roller bearing, the surface on one side in the plate thickness direction is configured with a curved surface, and the bulging portion that bulges toward the rolling surface side of the roller is provided. Is provided. Therefore, even when the roller rolling on the raceway surface, specifically, the roller rolling surface is not provided with a crowning, the occurrence of edge load is suppressed when an eccentric load is applied to the thrust roller bearing. be able to. In addition, the differential slip can be reduced. In this case, since the surface on the other side in the plate thickness direction is flat, the surface of the bearing ring opposite to the raceway surface and the bearing ring are attached to the housing to which the bearing ring of the thrust roller bearing is attached. There is no gap between the housing. Then, when a thrust load is applied to the thrust roller bearing, the race ring does not bend. Therefore, the thrust load can be appropriately received.

It is a figure which shows the bearing ring of the thrust roller bearing which concerns on one Embodiment of this invention. It is sectional drawing which shows a part of raceway ring of the thrust roller bearing shown in FIG. It is an expanded sectional view which shows a part of thrust roller bearing provided with the bearing ring of the thrust roller bearing shown in FIG. It is sectional drawing of the bearing ring of the thrust roller bearing which concerns on other embodiment of this invention. It is sectional drawing of the bearing ring of the thrust roller bearing which concerns on other embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a raceway ring 11 of a thrust roller bearing according to an embodiment of the present invention. FIG. 1 is a view of the race 11 as seen from the axial direction of a rotating shaft (not shown) supported by a thrust roller bearing. FIG. 2 is a cross-sectional view showing a part of the bearing ring 11 of the thrust roller bearing shown in FIG. FIG. 2 is a case of cutting along a section indicated by II-II in FIG. In FIG. 2, the rotation axis 12 of the rotation shaft supported by the thrust roller bearing is indicated by a one-dot chain line. FIG. 3 is an enlarged cross-sectional view showing a part of the thrust roller bearing including the bearing ring 11 of the thrust roller bearing shown in FIG. FIG. 3 is an enlarged cross-sectional view of a region indicated by III in FIG. From the viewpoint of easy understanding, FIG. 3 illustrates the needle roller 13 provided in the thrust roller bearing and a part of the cage 14 that holds the needle roller 13. Further, the front and back direction of the paper surface in FIG. 1 and the vertical direction of the paper surface in FIG. 2 become the rotation axis direction of the thrust roller bearing. Further, the horizontal direction in FIG. 2 is the radial direction. Incidentally, ease aspects of understanding, the upper side indicated by the arrow A ₁ in FIG. 2, and FIG. 3, the upper axial direction. Moreover, illustration of a part of hatching of the member is omitted.

  With reference to FIGS. 1-3, the structure of the bearing ring 11 of the thrust roller bearing which concerns on one Embodiment of this invention is demonstrated. A raceway ring 11 of a thrust roller bearing according to an embodiment of the present invention has a disc shape, and a through hole 21 is provided in a central region thereof so as to pass straight through in the thickness direction. In the raceway ring 11, the surface 22 on one side in the plate thickness direction becomes the raceway surface. The track ring 11 has a configuration that does not have so-called wrinkles.

  Here, in the raceway ring 11, the surface 22 on one side in the plate thickness direction has a curved surface, and a bulging portion 23 that bulges toward the rolling surface 17 of the needle roller 13. Is provided. The bulging portion 23 is provided at the center in the radial direction on one surface 22 in the plate thickness direction that constitutes the raceway surface of the raceway ring 11. Moreover, when cut | disconnected by the plane in alignment with a plate | board thickness direction, the bulging part 23 is comprised so that a cross-section circular arc shape. Specifically, the bulging portion 23 is formed so that its surface forms a crowning shape. In this case, the bulging portion 23 is provided so that the radial central portion 24 protrudes most.

On the inner diameter side of the bulging portion 23, a first flat portion 25 having a flat surface is provided. Further, a second flat portion 26 having a flat surface is also provided on the outer diameter side of the bulging portion 23. The bulging portion 23 is formed so as to be smoothly connected to the first flat portion 25 and the second flat portion 26. The maximum protruding amount of the bulging portion 23, that is, the length in the plate thickness direction from the surface of the first and second flat portions 25 and 26 to the central portion 24 in the radial direction of the bulging portion is shown in FIG. of it represented by the length _{L 1.} In FIG. 1, for easy understanding, the boundary between the bulging portion 23 and the first flat portion 25 and the boundary between the bulging portion 23 and the second flat portion 26 are indicated by dotted lines. Yes.

  Here, the surface 27 on the other side in the plate thickness direction of the race 11 is flat. That is, the other surface 27 side in the thickness direction is all flat in the region where the first flat portion 25, the bulging portion 23, and the second flat portion 26 are provided.

  For such a race 11, for example, a flat plate member having the same thickness is prepared, and only the bulging portion 23 is left, and the first flat portion 25 and the second flat portion are left. 26 may be formed by cutting in the plate thickness direction, or a flat plate member having the same plate thickness is prepared, and the bulging portion 23 is formed in the central region in the radial direction. You may decide to form so that it may be piled up.

  Next, the structure of the thrust roller bearing 31 provided with such a bearing ring 11 is demonstrated. The thrust roller bearing 31 includes first and second two race rings 11 and 15 having the configuration shown in FIGS. 1 and 2 and a plurality of needle rollers 13 that roll on the raceway surface of the race ring 11. And a retainer 14 that holds the plurality of needle rollers 13. The first track ring 11 is arranged so that the bulging direction of the bulging portion 23 faces upward in the axial direction. On the other hand, the second bearing ring 15 is arranged so that the bulging direction of the bulging portion 28 faces downward in the axial direction. That is, in the first and second track rings 11 and 15, the bulging portions 23 and 28 are arranged to face each other. Further, the surface 27 on the other side of the first race 11 is flat and is disposed so as to face the upper side in the axial direction. Here, the first track ring 11 is installed on the upper side of the housing 32 arranged on the lower side in the axial direction. In this case, the surface 33 located on the upper side in the axial direction of the housing 32 is flat. Therefore, there is no gap between the surface 27 on the other side of the first race 11 and the surface 33 located on the upper side in the axial direction of the housing 32. The second race 15 is installed below the housing 34 arranged on the upper side in the axial direction. In this case, the surface 35 located on the lower side in the axial direction of the housing 34 is flat. Therefore, there is no gap between the surface 29 on the other side of the second race 15 and the surface 35 positioned on the upper side in the axial direction of the housing 34.

The cage 14 holds the needle rollers 13 so as to be accommodated in pockets 16 provided at intervals in the circumferential direction. The needle roller 13 is not provided with a crowning. That is, in the direction of the rotation axis of the needle roller 13 shown by an arrow A ₂ or the opposite direction in FIG. 3, the rolling surface 17 of the needle rollers 13 in the cross section shown in FIG. 3, a shape extending straight in the left-right is there. The arrow A ₂ indicates the outer diameter direction of the thrust roller bearing 31. The shape of the cage 14 is substantially W-shaped in the cross section shown in FIG.

  For the thrust roller bearing 31 provided with such bearing rings 11 and 15, the needle roller 13 accommodated in the pocket 16 during the operation of the bearing is the first bearing ring 11 located on the lower side in the axial direction. It rolls on the raceway surface 18 and the raceway surface 19 of the second race ring 15 positioned on the upper side in the axial direction. In this case, specifically, it rolls on the bulging portion 23 provided on the first race ring 11 and the bulge portion 28 provided on the second race ring 15. In addition, each needle roller 13 accommodated in the pocket 16 performs a revolving motion while performing a rotation motion. In addition, the cage 14 rotates around the rotation axis 12.

  Here, according to such a configuration, in the raceway rings 11 and 15 of the thrust roller bearing, the surface 22 is configured by a curved surface on the surface 22 on one side in the plate thickness direction. The bulging parts 23 and 28 which bulge to the surface 17 side are provided. Therefore, the needle roller 13 that rolls on the raceway surfaces 18 and 19, specifically, even if no crowning is provided on the rolling surface 17 of the needle roller 13, an eccentric load is applied to the thrust roller bearing 31. In some cases, the occurrence of edge loading can be suppressed. In addition, the differential slip can be reduced. In this case, since the surfaces 27 and 29 on the other side in the plate thickness direction are flat, the raceway among the raceways 11 and 15 between the housings 32 and 34 to which the raceway rings 11 and 15 of the thrust roller bearing are attached. There are no gaps between the surfaces 27 and 29 opposite to the surfaces 18 and 19 and the housings 32 and 34 to which the bearing rings 11 and 15 are attached. Then, when a thrust load is applied to the thrust roller bearing 31, the races 11 and 15 do not bend. Therefore, the thrust load can be appropriately received.

  In this case, the surface 22 on one side in the plate thickness direction is positioned on the inner diameter side of the bulging portion 23, and the first flat portion 25 whose surface is flat and the outer diameter side of the bulging portion 23. Since the second flat portion 26 having a flat surface is provided, the bulging portion 23 can be appropriately formed over the region where the needle roller 13 rolls.

  Further, in this case, since the bulging portion 23 is smoothly connected to the first flat portion 25 and the second flat portion 26, the occurrence of edge load can be further reduced.

  In addition, the form shown below may be sufficient. FIG. 4 is a cross-sectional view showing a part of a bearing ring of a thrust roller bearing according to another embodiment of the present invention. FIG. 4 corresponds to the cross section shown in FIG.

  Referring to FIG. 4, a bearing ring 41 of a thrust roller bearing according to another embodiment of the present invention has a disk shape, and a through hole 42 that passes straight through in the thickness direction is provided in the center region. ing. In the raceway ring 41, a surface 43 on one side in the plate thickness direction becomes a raceway surface. This race ring 41 is configured to include a flange 44 extending in the plate thickness direction at the inner diameter side end.

  The surface 43 of the raceway ring 41 on one side in the plate thickness direction has a curved surface and is provided with a bulging portion 45 that bulges toward the rolling surface side of the needle roller. Yes. The bulging portion 45 is provided at the center in the radial direction on one surface 43 in the plate thickness direction that constitutes the raceway surface of the raceway ring 41. Moreover, when cut | disconnected by the plane in alignment with a plate | board thickness direction, the bulging part 45 is comprised so that a cross-section arc shape. Specifically, the bulging portion 45 is formed so that its surface forms a crowning shape. The bulging portion 45 is provided such that the central portion 46 in the radial direction protrudes most.

  A first flat portion 47 having a flat surface is provided on the inner diameter side of the bulging portion 45. A second flat portion 48 having a flat surface is also provided on the outer diameter side of the bulging portion 45. The bulging portion 45 is formed so as to be smoothly connected to the first flat portion 47 and the second flat portion 48.

  Further, the other surface 49 in the plate thickness direction of the track ring 41 is flat. That is, the other surface 49 side in the thickness direction is all flat in the region where the first flat portion 47, the bulging portion 45, and the second flat portion 48 are provided. You may decide to comprise in this way.

  Moreover, the form shown below may be sufficient. FIG. 5 is a cross-sectional view showing a part of a bearing ring of a thrust roller bearing according to still another embodiment of the present invention. FIG. 5 corresponds to the cross section shown in FIGS.

  Referring to FIG. 5, a bearing ring 51 of a thrust roller bearing according to still another embodiment of the present invention has a disc shape, and a through hole 52 that penetrates straight in the thickness direction is provided in the center region. It has been. In the raceway ring 51, a surface 53 on one side in the thickness direction is a raceway surface. The race 51 has a configuration including a flange 54 extending in the thickness direction at the outer diameter side end.

  The surface 53 of the raceway ring 51 on one side in the plate thickness direction has a curved surface and is provided with a bulging portion 55 that bulges toward the rolling surface side of the needle roller. Yes. The bulging portion 55 is provided at the center in the radial direction on one surface 53 in the plate thickness direction that constitutes the raceway surface of the race 51. Moreover, when cut | disconnected by the plane along a plate | board thickness direction, the bulging part 55 is comprised so that a cross-section arc shape. Specifically, the bulging portion 55 is formed such that the surface thereof forms a crowning shape. The bulging portion 55 is provided so that the radial central portion 56 protrudes most.

  A first flat part 57 having a flat surface is provided on the inner diameter side of the bulging part 55. Further, a second flat portion 58 having a flat surface is also provided on the outer diameter side of the bulging portion 55. The bulging portion 55 is formed so as to be smoothly connected to the first flat portion 57 and the second flat portion 58.

  Further, the other surface 59 in the plate thickness direction of the race 51 is flat. That is, the other surface 59 side in the thickness direction is all flat in the region where the first flat portion 57, the bulging portion 55, and the second flat portion 58 are provided. You may decide to comprise in this way.

  As described above, according to the configuration of the bearing ring of such a thrust roller bearing, a thrust load can be appropriately received.

  In the above embodiment, the first flat portion is provided on the inner diameter side of the bulging portion, and the second flat portion is provided on the outer diameter side of the bulging portion. Either one of the first flat portion and the second flat portion may be omitted, or both may be omitted. That is, you may comprise so that the surface of the one side of a plate | board thickness direction may become the shape which has taken out entirely over radial direction.

  In the above embodiment, the first flat portion, the bulging portion, and the second flat portion are respectively prepared for the method of manufacturing the raceway, and are joined and joined together in the radial direction. You may make it manufacture the bearing ring of the structure which carried out.

  In the above-described embodiment, the collar portion of the race ring may be provided on both the inner diameter side and the outer diameter side. Of course, the shape of the collar portion may be provided so as to incline at an acute angle on the outer diameter side or the inner diameter side, or may be a shape formed by bending a plurality of times.

  In the above-described embodiment, the bulging portion is configured to form a crowning shape. Of course, the crowning shape includes a partial crowning shape and a full crowning shape.

  In the case where the crowning shape is provided, the radial position where the crowning shape is provided may be provided so that the so-called center of the bulging portion coincides with the PCD (Pitch Circle Diameter) of the roller. The length in the radial direction from the center of the bulging part to the flat part located on the inner diameter side is equal to the length in the radial direction from the center of the bulging part to the flat part located on the outer diameter side. May be. By doing so, since the slip ratio is averaged over the entire contact length region of the roller, it is possible to expect an extension of the peeling life of the bearing ring and the roller.

  In the above embodiment, needle rollers are used as the rollers. However, the present invention is not limited thereto, and other rollers such as rod rollers may be used. Further, the shape of the cage is not limited to the above-described form, and for example, a cage that is not bent in the plate thickness direction or a so-called box-shaped cage can be adopted.

  In the above embodiment, the two race rings arranged in the vertical direction of the thrust roller bearing have been adopted as the race rings having the shapes shown in FIGS. 1 and 2, respectively. It is good also as employ | adopting only at least any one.

  Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The thrust ring of the thrust roller bearing according to the present invention is effectively used when it is required to appropriately receive a thrust load.

  11, 15, 41, 51 raceway ring, 12 rotation axis, 13 needle roller, 14 cage, 31 thrust roller bearing, 16 pocket, 17 rolling surface, 18, 19 raceway surface, 21, 42, 52 through hole, 22, 27, 29, 33, 35, 43, 49, 53, 59, surface, 23, 28, 45, 55 bulging part, 24, 46, 56 central part, 25, 26, 47, 48, 57, 58 Flat part, 32, 34 housing, 44, 54 collar.

Claims (6)

A thrust roller bearing is provided in a thrust roller bearing, is a plate, and has a raceway surface provided with a raceway surface that rolls the roller on one surface in the plate thickness direction.
The surface of the one side in the plate thickness direction is configured with a curved surface, and a bulging portion that bulges to the rolling surface side of the roller is provided,
The surface of the other side in the plate thickness direction is flat, a bearing ring of a thrust roller bearing. The one side surface in the plate thickness direction is located on the inner diameter side of the bulging portion, the first flat portion whose surface is flat, and the outer diameter side of the bulging portion, its surface The thrust ring of the thrust roller bearing according to claim 1, wherein a second flat portion is provided. The thrust roller bearing raceway ring according to claim 2, wherein the bulging portion is smoothly connected to the first flat portion and the second flat portion. The thrust ring of the thrust roller bearing according to any one of claims 1 to 3, wherein the bulging portion has a circular arc cross section when cut along a plane along the plate thickness direction. The thrust ring of the thrust roller bearing according to any one of claims 1 to 4, wherein the bulging portion has a crowning shape. The bearing ring for a thrust roller bearing according to any one of claims 1 to 5, further comprising a flange portion extending in at least one of the outer diameter side end portion and the inner diameter side end portion in the thickness direction.

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