Radial thrust bearing

Abstract

The radial thrust bearing is provided with a plurality of radial rolling bodies, a radial retainer, a plurality of thrust rolling bodies, a thrust retainer, an outer ring and an inner ring. The outer ring is provided with through-holes extending from the outside to the raceway regions of the plurality of radial rolling elements. The radial retainer includes: a pair of annular portions disposed at a distance from each other in the axial direction; and a plurality of column sections which are arranged at intervals in the circumferential direction so as to form pockets for accommodating the radial rolling elements, and which are connected to the pair of annular sections. The outer diameter surface of the column part is provided with a groove part which extends in the axial direction and is recessed toward the inner diameter side. The groove portion has an opening at at least one end portion in the axial direction of the column portion.

Description

Technical Field

[0001] The present disclosure relates to a radial thrust bearing. This application claims priority based on Japanese application No. 2022-181893 filed on November 14, 2022, and all the contents described in the Japanese application are cited. Background Art

[0002] A thrust needle roller bearing is known, which includes a retainer for retaining a needle roller (for example, see Patent Document 1). In the retainer included in the thrust needle roller bearing disclosed in Patent Document 1, a convex portion or a concave portion that hinders the flow of lubricating oil is formed on the axial side of the column portion located between the pockets. In addition, a retainer for a double-row roller bearing is known (for example, see Patent Document 2). The retainer disclosed in Patent Document 2 has a single annular portion, a plurality of column portions extending from one side of the annular portion to one axial side, and a plurality of column portions extending from the other side of the annular portion to the other axial side.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-1026

[0006] Patent Document 2: Japanese Patent Application Publication No. 2019-65919 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] Recently, when it is necessary to bear a load in the radial direction and a load in the thrust direction, a radial thrust bearing that can bear both loads is used. Compared with the case where a radial roller bearing and a thrust roller bearing are used separately, such a radial thrust bearing is easy to miniaturize the bearing, so it is preferably used. Among them, a radial thrust bearing is sometimes used in a situation where a heat source such as a motor is close or in a situation where the bearing becomes hot due to high-speed rotation. In such a case, it is required to effectively cool the radial thrust bearing and make the rolling element roll smoothly.

[0009] Therefore, one of the objects of the present invention is to provide a radial thrust bearing capable of ensuring effective cooling and smooth rolling of rolling elements.

[0010] Means used to solve problems

[0011] The radial thrust bearing according to the present disclosure bears loads in the radial direction and loads in the thrust direction. The radial thrust bearing comprises: a plurality of radial rolling elements that bear loads in the radial direction; a radial retainer that retains a plurality of radial rolling elements; a plurality of thrust rolling elements that bear loads in the thrust direction; a thrust retainer that retains a plurality of thrust rolling elements; an outer ring having a first outer ring raceway surface that contacts the rolling surface of the radial rolling element; and an inner ring having a first inner ring raceway surface that contacts the rolling surface of the radial rolling element. The outer ring includes a second outer ring raceway surface that contacts the rolling surface of the thrust rolling element. The inner ring includes a second inner ring raceway surface that contacts the rolling surface of the thrust rolling element. A through hole from the outside to the raceway area of ​​the plurality of radial rolling elements is provided in the outer ring. The radial retainer comprises: a pair of annular portions that are spaced apart in the axial direction; and a plurality of columnar portions that are spaced apart in the circumferential direction to form pockets for accommodating the radial rolling elements and are connected to the pair of annular portions. A groove portion extending in the axial direction and recessed toward the inner diameter side is provided on the outer diameter surface of the column portion. The groove portion has an opening at at least one end portion in the axial direction of the column portion.

[0012] Effects of the Invention

[0013] According to the above-described radial thrust bearing, effective cooling and smooth rolling of the rolling elements can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic perspective view showing the appearance of a radial thrust bearing in Embodiment 1 of the present disclosure.

[0015] Figure 2 Observed from the axial direction Figure 1 A schematic top view of a radial thrust bearing is shown.

[0016] Figure 3 Viewed from the outer diameter side Figure 1 A schematic side view of a radial thrust bearing is shown.

[0017] Figure 4 Yes means Figure 1 A schematic cross-sectional view of a portion of a radial thrust bearing is shown.

[0018] Figure 5 yes Figure 1 Exploded view of a radial thrust bearing shown.

[0019] Figure 6 Yes Figure 1 An enlarged view showing an enlarged representation of a portion of a radial thrust bearing is shown.

[0020] Figure 7 It means in Figure 6 The radial thrust bearing shown is a diagram in which an outer ring, which will be described later, is removed.

[0021] Figure 8 This is a three-dimensional view of the radial retainer.

[0022] Fig. 9 is Figure 8 An enlarged view of the area designated IX in the radial retainer is shown.

[0023] Fig.10 This is a diagram showing a portion of a radial thrust bearing with the outer ring removed, enlarged and viewed from the radial direction.

[0024] Fig.11 It is an enlarged cross-sectional view showing a part of the radial retainer.

[0025] Fig.12 This is a diagram showing a portion of the radial retainer as viewed from the outer diameter side. DETAILED DESCRIPTION

[0026] [Overview of Embodiments]

[0027] The radial thrust bearing disclosed in the present invention bears loads in the radial direction and loads in the thrust direction. The radial thrust bearing comprises: a plurality of radial rolling elements that bear loads in the radial direction; a radial retainer that retains a plurality of radial rolling elements; a plurality of thrust rolling elements that bear loads in the thrust direction; a thrust retainer that retains a plurality of thrust rolling elements; an outer ring having a first outer ring raceway surface that contacts the rolling surface of the radial rolling element; and an inner ring having a first inner ring raceway surface that contacts the rolling surface of the radial rolling element. The outer ring includes a second outer ring raceway surface that contacts the rolling surface of the thrust rolling element. The inner ring includes a second outer ring raceway surface that contacts the rolling surface of the thrust rolling element. A through hole from the outside to the raceway area of ​​the plurality of radial rolling elements is provided in the outer ring. The radial retainer comprises: a pair of annular portions that are spaced apart in the axial direction; and a plurality of columnar portions that are spaced apart in the circumferential direction to form pockets for accommodating the radial rolling elements and are connected to the pair of annular portions. A groove portion extending in the axial direction and recessed toward the inner diameter side is provided on the outer diameter surface of the column portion. The groove portion has an opening at at least one end portion in the axial direction of the column portion.

[0028] According to the radial thrust bearing involved in the present invention, since it includes a plurality of radial rolling elements that bear radial loads and a plurality of thrust rolling elements that bear thrust loads, it is possible to appropriately bear radial loads and thrust loads through one bearing. In this way, the bearing can be miniaturized. In addition, since it includes a radial retainer that holds the radial rolling elements and a thrust retainer that holds the thrust rolling elements, the posture of each rolling element can be stabilized during rolling.

[0029] Among them, regarding the radial thrust bearing, there are cases where it is used near a heat source, and the bearing itself becomes hot due to high-speed rotation. In such a case, in order to make the radial rolling elements and the thrust rolling elements roll stably, the bearing needs to be cooled. The outer ring included in the radial thrust roller bearing disclosed in the present invention is provided with a through hole from the outside to the raceway area of ​​the plurality of radial rolling elements, so that the through hole can be used to send a fluid lubricant such as oil gas and oil mist into the inside of the bearing. Therefore, the cooling of the inside of the bearing and the improvement of the lubrication performance can be achieved. Among them, a groove having an opening at at least one end of the axial direction of the column part is provided on the outer diameter surface of the column part of the radial retainer. The groove part extends in the axial direction and is recessed toward the inner diameter side. In this way, the lubricant that reaches the outer diameter surface of the radial retainer through the through hole can be supplied to the axial opening side by the groove part. According to the radial thrust bearing of this structure, by supplying lubricant by using the groove part, the inside of the bearing can be effectively cooled, and the lubrication performance of the supplied lubricant on the radial rolling elements and the thrust rolling elements can be improved. Therefore, according to the above-mentioned radial thrust bearing, effective cooling and smooth rolling of the rolling elements can be ensured.

[0030] In the above-mentioned radial thrust bearing, the wall surface constituting the groove portion may also include a curved surface that is arc-shaped when viewed in the axial direction. As a result, the lubricant supplied through the through hole is smoothly discharged from the groove portion in the axial direction, thereby reducing the possibility of the lubricant remaining in the groove portion. Therefore, more effective cooling and smoother rolling of the rolling element can be ensured.

[0031] In the above-mentioned radial thrust bearing, the groove portion may have an opening only at one end portion of the column portion in the axial direction. Thus, when a heat source is arranged on one side in the axial direction, the opening of the groove portion can be arranged on the side where the heat source is arranged, thereby actively supplying lubricant to the heat source side. Therefore, more effective cooling can be achieved.

[0032] In the above-mentioned radial thrust bearing, the wall surface constituting the other axial side of the groove portion may also include a portion of the spherical surface. Thus, the possibility of lubricant remaining in the groove portion can be reduced on the closed area side of the groove portion. Therefore, more effective cooling and smoother rolling of the rolling element can be ensured.

[0033] In the radial thrust bearing, the column portion may have a protruding area protruding toward the side where the pocket is arranged on the outer diameter side and the inner diameter side of the pair of annular portions. Thus, the rolling element accommodated in the pocket can be prevented from falling out by the protruding area.

[0034] In the above-mentioned radial thrust bearing, a plurality of through holes may be provided at intervals in the circumferential direction, and may be provided so as to have an opening on the outer diameter surface of the outer ring. Thus, lubricant can be supplied from the through holes and discharged from the through holes. Therefore, more effective cooling can be performed.

[0035] In the above-mentioned radial thrust bearing, the wall surface constituting the through hole can also be arranged straight in the radial direction. Thus, the resistance when the lubricant is supplied into the bearing can be reduced. Therefore, the lubricant can be smoothly supplied from the outside to the raceway area of ​​the radial rolling element.

[0036] In the above radial thrust bearing, the wall surface constituting the through hole may be tapered so that the outer diameter surface side becomes larger. Thus, the lubricant can be supplied into the groove portion with good momentum, and the lubricant can be supplied to the inside of the bearing quickly.

[0037] In the above-mentioned radial thrust roller bearing, the plurality of thrust rolling elements may also be arranged in double rows in the axial direction at both ends of the radial rolling element. A pair of thrust retainers may also be provided to retain the plurality of thrust rolling elements arranged in double rows. Thus, the plurality of thrust rolling elements arranged in double rows can bear a greater thrust load. Therefore, the load bearing capacity in the thrust direction can be increased.

[0038] [Specific example of embodiment]

[0039] Next, an example of a specific embodiment of the radial thrust bearing disclosed in the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and their description will not be repeated.

[0040] (Implementation Method 1)

[0041] First, Embodiment 1 which is an embodiment of the present disclosure will be described. Figure 1 It is a schematic perspective view showing the appearance of a radial thrust bearing in Embodiment 1 of the present disclosure. Figure 2 Observed from the axial direction Figure 1 A schematic top view of a radial thrust bearing is shown. Figure 2 It is from Figure 1 The figure is viewed in the opposite direction of the arrow Z. Figure 1 In the figures shown below, the Z direction indicates the axial direction. That is, although not shown in the figure, the shaft supported by the radial thrust bearing extends in the Z direction. The X direction and the Y direction indicate the radial direction from the center of the radial thrust bearing when viewed from the axial direction. The X direction is a direction orthogonal to the Y direction on a plane perpendicular to the axial direction. Figure 3 Viewed from the outer diameter side Figure 1 A schematic side view of a radial thrust bearing is shown. Figure 4 Yes means Figure 1 A schematic cross-sectional view of a portion of a radial thrust bearing is shown. Figure 4 This is a cross-sectional view when cut along the XZ plane. Figure 5 yes Figure 1 Exploded view of a radial thrust bearing shown. Figure 6 Yes Figure 1 An enlarged view showing an enlarged representation of a portion of a radial thrust bearing is shown. Figure 7 It means in Figure 6 The radial thrust bearing shown is a diagram in which an outer ring, which will be described later, is removed.

[0042] Reference Figure 1 to Figure 7 The radial thrust bearing 11 according to the first embodiment of the present disclosure is a bearing capable of bearing both radial load and thrust load. The radial thrust bearing 11 includes an outer ring 12, an inner ring 13, a plurality of radial rollers 14 as a plurality of radial rolling elements bearing radial load, a plurality of thrust rollers 15 as a plurality of thrust rolling elements bearing thrust load, a plurality of thrust rollers 16 as a plurality of thrust rolling elements bearing thrust load, a radial retainer 17 for holding the plurality of radial rollers 14, a thrust retainer 18 for holding the plurality of thrust rollers 15, and a thrust retainer 19 for holding the plurality of thrust rollers 16. In addition, the radial rollers 14, the thrust rollers 15, and the thrust rollers 16 may all be rollers of the same shape. That is, the radial rollers 14, the thrust rollers 15, and the thrust rollers 16 are classified according to the positions where the rollers are arranged.

[0043] A plurality of thrust rollers 15 and a plurality of thrust rollers 16 are arranged in double rows at intervals in the axial direction. In the present embodiment, a plurality of thrust rollers 15 and a plurality of thrust rollers 16 are arranged in double rows in the axial direction at both ends of the radial roller 14. The thrust retainer 18 and the thrust retainer 19 are arranged in a pair, respectively retaining the thrust rollers 15 and the thrust rollers 16 arranged in double rows. The radial thrust bearing 11 of such a structure can withstand a greater thrust load by the plurality of thrust rollers 15 and the plurality of thrust rollers 16 arranged in double rows. Therefore, the load bearing capacity in the thrust direction can be increased. Such a radial thrust bearing 11 is suitable for use as a rotary bearing, for example.

[0044] The outer ring 12 is a disk-shaped device having a hole extending in the axial direction at the center of the radial direction. The inner diameter surface of the outer ring 12 is a first outer ring raceway surface 31 that contacts the rolling surface 21 of the radial roller 14. That is, the outer ring 12 has a first outer ring raceway surface 31 that contacts the rolling surface 21 of the radial roller 14. On the outer ring 12, a plurality of mounting holes 32 extending in the axial direction are provided at intervals in the circumferential direction. That is, the mounting holes 32 extend from the end surface 33 on one side of the axial direction of the outer ring 12 to the end surface 34 on the other side. These mounting holes 32 are circular holes and are used for mounting the outer ring 12 to other components.

[0045] The outer ring 12 is provided with through holes 35 from the outside to the raceway area of ​​the plurality of radial rollers 14. A plurality of through holes 35 are provided at intervals in the circumferential direction. The through holes 35 are also called grease supply holes, and the through holes 35 are provided so as to have an opening on the outer diameter surface 36 of the outer ring 12. The through holes 35 are provided through the radial direction. The wall surface constituting the through holes 35 is provided straightly in the radial direction. The plurality of through holes 35 are provided so as to be offset from the mounting holes 32 in the circumferential direction. That is, when viewed from the axial direction, the position where the mounting holes 32 are provided is offset from the position where the through holes 35 are provided in the circumferential direction. The through holes 35 are also in the shape of circular holes. The diameter of the through holes 35 is configured to be smaller than the diameter of the mounting holes 32. These through holes 35 are used to supply lubricants such as oil gas and oil mist into the bearing or discharge them out of the bearing in order to cool the radial thrust bearing 11 and provide lubricity. The ratio of the through holes 35 for supplying oil and gas to the through holes 35 for exhausting oil and gas among the plurality of through holes 35 is arbitrarily adjusted according to cooling performance, lubrication performance, the amount of heat generated from the heat source, and the like.

[0046] The outer ring 12 includes a second outer ring raceway surface 37 in contact with the rolling surface 22 of the thrust roller 15. The outer ring 12 includes a second outer ring raceway surface 38 in contact with the rolling surface 23 of the thrust roller 16. The second outer ring raceway surface 37 and the second outer ring raceway surface 38 are arranged at a distance in the axial direction.

[0047] The inner ring 13 is formed by combining two raceways 41 and 42. The first raceway 41 and the second raceway 42 are both disc-shaped and have holes 48 and 49 penetrating in the axial direction at the center of the radial direction. The first raceway 41 and the second raceway 42 are combined in contact with each other in the axial direction. The radial thrust bearing 11 supports the shaft (not shown) of the holes 48 and 49 arranged on the inner diameter side of the inner ring 13. A part of the outer diameter surface of the first raceway 41 becomes the first inner ring raceway surface 43 that contacts the rolling surface 21 of the radial roller 14. That is, the inner ring 13 has the first inner ring raceway surface 43 that contacts the rolling surface 21 of the radial roller 14. The radial space between the first outer ring raceway surface 31 and the first inner ring raceway surface 43 becomes a raceway area for a plurality of radial rollers 14 to roll.

[0048] The first raceway ring 41 includes a second inner raceway surface 44 in contact with the rolling surface 22 of the thrust roller 15. The first raceway ring 42 includes a second inner raceway surface 45 in contact with the rolling surface 23 of the thrust roller 16. The second inner raceway surface 44 and the second inner raceway surface 45 are arranged to be opposite to each other in the axial direction. The axial space between the second outer raceway surface 37 and the second inner raceway surface 44 becomes the raceway area where the plurality of thrust rollers 15 roll. The axial space between the second outer raceway surface 38 and the second inner raceway surface 45 becomes the raceway area where the plurality of thrust rollers 16 roll.

[0049] The first raceway ring 41 is provided with a connection hole 46 that penetrates in the axial direction. A plurality of connection holes 46 are provided at intervals in the circumferential direction. The connection hole 46 is provided at a position closer to the inner diameter side than the second inner ring raceway surface 44. The second raceway ring 42 is provided with a connection hole 47 that penetrates in the axial direction. A plurality of connection holes 47 are provided at intervals in the circumferential direction. The connection hole 47 is provided at a position closer to the inner diameter side than the second inner ring raceway surface 45. The circumferential intervals of the connection holes 47 are the same as the circumferential intervals of the connection holes 46. The first raceway ring 41 and the second raceway ring 42 can be connected by bolts using the connection holes 46 and the connection holes 47.

[0050] The thrust retainer 18 for holding a plurality of thrust rollers 15 is arranged between the second outer ring raceway surface 37 and the second inner ring raceway surface 44. The thrust retainer 18 is in the shape of a disk, and pockets for holding a plurality of thrust rollers 15 are provided at intervals in the circumferential direction. The thrust retainer 19 for holding a plurality of thrust rollers 16 is arranged between the second outer ring raceway surface 38 and the second inner ring raceway surface 45. The thrust retainer 19 is in the shape of a disk, and pockets for holding a plurality of thrust rollers 16 are provided at intervals in the circumferential direction.

[0051] Next, the structure of the radial retainer 17 will be described. Figure 8 1 is a perspective view of the radial retainer 17. Figure 8 In the figure, the radial rollers 14 are also shown. Fig. 9 is Figure 8 An enlarged view of the area denoted by IX in the radial retainer 17 is shown. Fig.10 This is a diagram showing a portion of the radial thrust roller bearing 11 in an enlarged manner from the radial direction with the outer ring removed. Fig.11 It is an enlarged cross-sectional view showing a part of the radial retainer 17 . Fig.11 This is a cross-sectional view when cut along the XY plane. Fig.12 This is a diagram showing a portion of the radial retainer 17 as viewed from the outer diameter side.

[0052] Refer to Figure 8 to Figure 12, the radial retainer 17 retains a plurality of radial rollers 14. The radial retainer 17 includes an annular portion 51, an annular portion 52 and a plurality of columnar portions 53 which are arranged at intervals in the axial direction. The annular portion 51 and the annular portion 52 are provided as a pair. The plurality of columnar portions 53 are respectively shaped to extend in the axial direction and are connected to the pair of annular portions 51 and the annular portion 52. The plurality of columnar portions 53 are respectively arranged at intervals in the circumferential direction to form pockets 54 for accommodating the radial rollers 14. One radial roller 14 is accommodated in each pocket 54. The columnar portion 53 has a protruding area 55 and a protruding area 56 which protrude toward the side where the pocket 54 is arranged on the outer diameter side and the inner diameter side of the pair of annular portions 51 and the annular portion 52. The protruding areas 55 and the protruding areas 56 can prevent the radial rollers 14 accommodated in the pockets 54 from falling out. Furthermore, the radial roller 14 is accommodated in the pocket 54 by elastically deforming any one of the protruding regions 55 and 56 to be pressed in the radial direction.

[0053] Among them, a groove portion 61 extending in the axial direction and recessed toward the inner diameter side is provided on the outer diameter surface 57 of the column portion 53. The groove portion 61 is provided in each column portion 53. The groove portion 61 has an opening 62 at at least one end of the axial direction of the column portion 53. In the present embodiment, the groove portion 61 has an opening 62 only at one end of the axial direction of the column portion 53. The wall surface 63 constituting the groove portion 61 includes an arc-shaped curved surface when viewed in the axial direction. In the present embodiment, the wall surface 63 constituting the groove portion 61 is a semicircular curved surface when viewed in the axial direction. In addition, the wall surface 64 constituting the other axial side of the groove portion 61 includes a part of a spherical surface. In the present embodiment, the wall surface 64 constituting the other axial side of the groove portion 61 is a part of a spherical surface. In addition, the circumferential width of the groove portion 61, the radial depth, the position of the closed groove portion 61, etc. can be set arbitrarily.

[0054] According to the radial thrust bearing 11 of such a structure, since it includes a plurality of radial rollers 14 that bear radial loads, and a plurality of thrust rollers 15 and a plurality of thrust rollers 16 that bear thrust loads, it is possible to use one bearing to appropriately bear radial loads and thrust loads. In this way, the bearing can be miniaturized. In addition, since it includes a radial retainer 17 that holds the radial rollers 14, a thrust retainer 18 that holds the thrust rollers 15, and a thrust retainer 19 that holds the thrust rollers 16, the posture of each roller can be stabilized during rolling.

[0055] Among them, regarding the radial thrust bearing 11, there are cases where it is used near a heat source, or the bearing itself becomes hot due to high-speed rotation. In such a case, in order to make the radial rollers 14, the thrust rollers 15, and the thrust rollers 16 roll stably, the bearing needs to be cooled. The outer ring 12 included in the radial thrust bearing 11 of the present disclosure is provided with a through hole 35 from the outside to the raceway area of ​​the plurality of radial rollers 14, so that the through hole 35 can be used to send a fluid lubricant such as oil gas and oil mist into the inside of the bearing. Therefore, the cooling of the inside of the bearing and the improvement of the lubrication performance can be achieved. Among them, the outer diameter surface 57 of the column 53 of the radial retainer 17 is provided with a groove portion 61 having an opening 62 at the end of one axial side of the column 53. The groove portion 61 extends in the axial direction and is recessed toward the inner diameter side. In this way, the lubricant that reaches the outer diameter surface 57 of the radial retainer 17 through the through hole 35 can be supplied to the axial opening 62 side by the groove portion 61. In this embodiment, particularly referring to Fig.10 , the lubricant can be actively supplied to the second raceway 42 side as shown by arrow 24. In addition, on the closed side, that is, the first raceway 41 side, the lubricant is retained as shown by arrow 25, and the lubricant is gradually supplied to the outer diameter side as shown by the dotted arrow 26. According to the radial thrust bearing 11 of such a structure, by supplying the lubricant using the groove portion 61, the inside of the bearing can be effectively cooled, and the lubricating performance of the supplied lubricant on the radial rollers 14, the thrust rollers 15, and the thrust rollers 16 can be improved. Therefore, according to the above-mentioned radial thrust bearing 11, effective cooling and smooth rolling of the rollers can be ensured.

[0056] In the present embodiment, the wall surface 63 constituting the groove portion 61 includes an arc-shaped curved surface when viewed in the axial direction. Therefore, the lubricant supplied through the through hole 35 is smoothly discharged from the groove portion 61 in the axial direction, thereby reducing the possibility of the lubricant remaining in the groove portion 61. Therefore, more effective cooling and smoother rolling of the roller can be ensured.

[0057] In the present embodiment, the groove 61 has an opening 62 only at one end portion in the axial direction of the column 53. Therefore, when a heat source is arranged on one side in the axial direction, the opening 62 of the groove 61 can be arranged on the side where the heat source is arranged, so that the lubricant can be actively supplied to the heat source agent side. Therefore, more effective cooling can be achieved.

[0058] In this embodiment, the wall surface 64 constituting the other axial side of the groove portion 61 includes a part of a spherical surface. Therefore, the possibility of lubricant remaining in the groove portion 61 can be reduced on the closed region side of the groove portion 61. Therefore, more effective cooling and smoother rolling of the roller can be ensured.

[0059] In this embodiment, the wall surface constituting the through hole 35 is arranged straight in the radial direction. Therefore, the resistance when the lubricant is supplied into the bearing can be reduced. Therefore, the lubricant can be smoothly supplied from the outside to the raceway region of the radial roller 14.

[0060] (Other embodiments)

[0061] In addition, in the above-mentioned embodiment, the groove portion may also be configured to have openings at both ends of the column portion in the axial direction. Thus, lubricant can be supplied to both ends of the column portion in the axial direction. Therefore, it is easy to supply lubricant to the entire interior of the bearing, thereby improving cooling and lubrication performance. Such a structure is suitable, for example, for a case where a heat source is not configured only on either side of the axial direction.

[0062] In addition, in the above-mentioned embodiment, the wall surface constituting the through hole is arranged straight in the radial direction, but the present invention is not limited thereto. For example, the wall surface constituting the through hole may be arranged in a tapered shape so that the outer diameter side becomes larger. Thus, the lubricant can be supplied into the groove portion with good momentum, and the lubricant can be supplied to the inside of the bearing quickly.

[0063] Furthermore, in the above-described embodiment, the plurality of thrust rollers are arranged in double rows, but the present invention is not limited thereto, and the plurality of thrust rollers may be arranged in a single row.

[0064] In addition, in the above-mentioned embodiment, rollers are used as rolling elements, but the present invention is not limited to this, and balls may be used as rolling elements.

[0065] It should be understood that the embodiments disclosed this time are illustrative in all aspects and are not restrictive in any aspect. The scope of the present invention is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0066] Description of Reference Numerals

[0067] 11 radial thrust bearing, 12 outer ring, 13 inner ring, 14 radial roller, 15, 16 thrust roller, 17 radial retainer, 18, 19 thrust retainer, 21, 22, 23 rolling surface, 24, 25, 26 arrow, 31 first outer ring raceway surface, 32 mounting hole, 33, 34 end surface, 35 through hole, 36, 57 outer diameter surface, 37, 38 second outer ring raceway surface, 41 raceway ring (first raceway ring), 42 raceway ring (second raceway ring), 43 first inner ring raceway surface, 44, 45 second inner ring raceway surface, 46, 47 connecting hole, 48, 49 hole, 51, 52 annular portion, 53 column portion, 54 pocket hole, 55, 56 protruding area, 61 groove portion, 62 opening, 63, 64 wall surface.

Claims

1. A radial thrust bearing, bearing radial loads and thrust loads, wherein: have: Multiple radial rolling elements carry radial loads; A radial retainer, retaining a plurality of the radial rolling elements; Multiple thrust rolling elements carry the load in the thrust direction; A thrust retainer, retaining a plurality of the thrust rolling elements; an outer ring having a first outer ring raceway surface in contact with a rolling surface of the radial rolling element; and an inner ring having a first inner ring raceway surface in contact with the rolling surface of the radial rolling element, The outer ring includes a second outer ring raceway surface in contact with the rolling surface of the thrust rolling element, The inner ring includes a second inner ring raceway surface in contact with the rolling surface of the thrust rolling element, The outer ring is provided with a through hole extending from the outside to the raceway area of ​​the plurality of radial rolling elements. The radial retainer comprises: a pair of annular portions arranged at a distance from each other in the axial direction; and A plurality of columnar portions are arranged at intervals in the circumferential direction to form pockets for accommodating the radial rolling elements and are connected to the pair of annular portions. A groove portion extending in the axial direction and recessed toward the inner diameter side is provided on the outer diameter surface of the column portion. The groove portion has an opening at at least one end portion of the column portion in the axial direction.

2. The radial thrust bearing according to claim 1, wherein: The wall surface constituting the groove portion includes a curved surface that is arc-shaped when viewed in the axial direction.

3. The radial thrust bearing according to claim 1 or 2, wherein: The groove portion has an opening only at one end portion of the column portion in the axial direction.

4. The radial thrust bearing according to claim 3, wherein: The wall surface constituting the groove portion on the other axial side includes a portion of a spherical surface.

5. The radial thrust bearing according to claim 1 or 2, wherein: The column portion has a protruding area protruding toward a side where the pocket is arranged, on an outer diameter side and an inner diameter side of the pair of annular portions.

6. The radial thrust bearing according to claim 1 or 2, wherein: A plurality of the through holes are provided at intervals in the circumferential direction, and are provided so as to have an opening on the outer diameter surface of the outer ring.

7. The radial thrust bearing according to claim 1 or 2, wherein: The wall surface constituting the through hole is arranged straight in the radial direction.

8. The radial thrust bearing according to claim 1 or 2, wherein: The wall surface constituting the through hole is tapered so that the outer diameter surface side becomes larger.

9. The radial thrust bearing according to claim 1 or 2, wherein: The plurality of thrust rolling elements are arranged in double rows in the axial direction at both axial ends of the radial rolling element. The thrust retainers are provided in pair for retaining a plurality of the thrust rolling elements arranged in double rows.

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