JP2021014887A - Lubrication oil storage mechanism - Google Patents

Abstract

To supply a lubrication oil to a lubrication surface when a rolling bearing starts rotation.SOLUTION: A lubrication oil storage mechanism 200 includes storage part bodies provided on an end surface 124 as seen in a rotation axis direction at a rotating body (a differential case 120) which is fixed to an inner ring part 142 of a rolling bearing 140 and rotates with the inner ring part 142 or in a circumferential direction on an end surface 142a as seen in the rotation axis direction at the inner ring part 142. The storage part body includes a bottom part 240 connected to the inner ring part 142 or the rotating body and extending to the outer side of the rolling bearing 140 in the rotation axis direction; and a wall part 250 erected from the bottom part 240 to the radial outer side of the inner ring part 142. A lubrication oil is stored in a space enclosed by the bottom part 240 and the wall part 250.SELECTED DRAWING: Figure 2

Description

The present invention relates to a lubricating oil storage mechanism.

The differential device mounted on the vehicle is a device that distributes the driving force of the engine to one driving wheel and the other driving wheel (for example, Patent Document 1). Lubricating oil is stored in the lower part of the housing that surrounds the differential device. The stored lubricating oil is scraped up by the rotation of the ring gears constituting the differential device and supplied to the rolling bearings of the differential device and each gear.

Japanese Unexamined Patent Publication No. 2008-82530

In the differential device, when the vehicle is stopped, the rotation of the ring gear is stopped, so that the supply of lubricating oil to the rolling bearing is stopped. Further, the lubricating oil flows down from the lubricating surface of the rolling bearing with the passage of time. Therefore, there is a case where there is no lubricating oil on the lubricating surface of the rolling bearing at the time of starting a vehicle that has been stopped for a long period of time.

Therefore, there is a demand for the development of a technique capable of supplying lubricating oil to the lubricating surface when the rolling bearing starts to rotate.

An object of the present invention is to provide a lubricating oil storage mechanism capable of supplying lubricating oil to a lubricating surface when a rolling bearing starts to rotate.

In order to solve the above problems, the lubricating oil storage mechanism of the present invention is fixed to the inner ring portion of the rolling bearing and rotates together with the inner ring portion at the end face in the rotation axis direction or the end face in the inner ring portion in the rotation axis direction. The storage unit main body is provided with a plurality of storage unit main bodies provided in the circumferential direction of the above, and the storage unit main body is connected to the inner ring portion or the rotating body main body and extends to the outside of the rolling bearing in the rotation axis direction, and the bottom portion to the inner ring portion. Lubricating oil is stored in a space surrounded by a bottom portion and a side portion having a side portion erected outward in the radial direction of the bearing.

Further, the storage portion main body may include a guide portion extending from the tip of the side portion to the outside of the rolling bearing in the rotation axis direction.

Further, it is provided on the outer ring portion of the rolling bearing and has a protruding portion protruding outward of the rolling bearing in the rotation axis direction, and the tip of the side portion of the storage portion main body or the tip of the guide portion is in the rotation axis direction rather than the protruding portion. It may be located on the outer side of the rolling bearing in.

Further, the rolling bearing is a tapered roller bearing, and the storage portion main body may be provided on the rotating body main body fixed to the small diameter side of the inner ring portion or the small diameter side of the inner ring portion.

According to the present invention, it is possible to supply lubricating oil to the lubricating surface when the rolling bearing starts to rotate.

It is a figure explaining the differential apparatus which concerns on embodiment. It is a vertical sectional view of the lubricating oil storage mechanism. It is an exploded perspective view of a storage unit. It is a front view of a storage unit. It is a vertical sectional view of a storage unit. It is a figure explaining the lubricating oil storage mechanism concerning the modification.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, and the like shown in the embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate description, and elements not directly related to the present invention are not shown. To do.

[Differential device 100]
FIG. 1 is a diagram illustrating a differential device 100 according to the present embodiment. In FIG. 1, for easy understanding, a vertical cross-sectional view of the housing 10, rolling bearings 130 and 140, and the lubricating oil storage mechanism 200 is shown, and an external view of the ring gear 110 and the differential case 120 is shown. Further, in the following figures including FIG. 1 of the present embodiment, the ± X axis (horizontal direction), the ± Y axis (horizontal direction), and the ± Z axis (vertical direction) that intersect vertically are defined as shown in the figure. There is.

The differential device 100 is provided in the vehicle and distributes the driving force (torque) of the engine to one driving wheel and the other driving wheel. As shown in FIG. 1, the differential device 100 is housed in the housing 10. Lubricating oil is stored in the lower portion 12 of the housing 10. The differential device 100 includes a ring gear 110, a differential case 120, and rolling bearings 130 and 140.

The ring gear 110 is rotatably fixed to the housing 10 via a rolling bearing 130. The ring gear 110 is meshed with a drive pinion gear (not shown), receives the driving force of the engine via the drive pinion gear, and rotates with the ± X-axis direction in FIG. 1 as the rotation axis.

The differential case 120 (rotating body body) is rotatably fixed to the housing 10 via a rolling bearing 140. The differential case 120 is connected to the ring gear 110 and rotates integrally with the ring gear 110 with the ± X-axis direction in FIG. 1 as the rotation axis. A pinion gear and a side gear (not shown) are provided inside the differential case 120. The rotation of the differential case 120 is transmitted to the drive shaft and the drive wheels via the pinion gear and the side gear.

The rolling bearings 130 and 140 are tapered roller bearings. The rolling bearing 130 includes an inner ring portion 132, an outer ring portion 134, and a rolling element 136. The inner ring portion 132 is connected to the ring gear 110. The outer ring portion 134 is connected to the housing 10. The rolling element 136 has a conical shape and is provided so as to be rollable between the inner ring portion 132 and the outer ring portion 134. In the present embodiment, in the rolling bearing 130, the large diameter side of the inner ring portion 132 (rolling body 136) is connected to the ring gear 110.

The rolling bearing 140 includes an inner ring portion 142, an outer ring portion 144, and a rolling element 146. The inner ring portion 142 is press-fitted into the differential case 120. The outer ring portion 144 is connected to the housing 10. The rolling element 146 has a conical shape and is rotatably provided between the inner ring portion 142 and the outer ring portion 144. In the present embodiment, in the rolling bearing 140, the large diameter side of the inner ring portion 142 (rolling body 146) is connected to the differential case 120.

In the differential device 100, the ring gear 110 rotates as the engine (transmission) rotates, so that the lubricating oil stored in the lower portion 12 of the housing 10 is scraped up. The scraped-up lubricating oil collides with a wall surface such as the upper portion 14 of the housing 10 and falls. In the dropping process, the lubricating oil is supplied to the pinion gear and the side gear provided in the differential case 120 through the opening 122 formed in the differential case 120. Further, the lubricating oil includes the lubricating surface of the rolling bearing 130 (between the inner ring portion 132 and the outer ring portion 134 and the rolling element 136) and the lubricating surface of the rolling bearing 140 (inner ring portion 142 and the outer ring portion 144, and the rolling element 146). Is supplied during).

However, when the vehicle stops, the rotation of the ring gear 110 stops. Therefore, the supply of the lubricating oil to the rolling bearings 130 and 140 is stopped, and the lubricating oil flows down from the lubricating surface to the lower portion 12 of the housing 10. Therefore, when the vehicle has been stopped for a long period of time, there may be no lubricating oil (no oil film is formed) on the lubricating surfaces of the rolling bearings 130 and 140. Then, the lubricating surface may be seized and the rolling bearings 130 and 140 may be damaged.

Therefore, conventionally, the hydrostatic surface of the lubricating oil (indicated by the broken line in FIG. 1) is set to the height H where the rolling bearings 130 and 140 are located so that the rolling bearings 130 and 140 are always immersed in the lubricating oil. It was composed. That is, the lower portion 12 of the housing 10 stores the lubricating oil up to the position where the rolling bearings 130 and 140 are immersed in the state where the vehicle is stopped (when the vehicle is stopped). However, in this conventional technique, there is a problem that the stirring load by the ring gear 110 becomes large and the fuel consumption deteriorates.

Therefore, in the present embodiment, the lubricating oil storage mechanism 200 is provided in the vicinity of the rolling bearings 130, 140 or the rolling bearings 130, 140. Hereinafter, the lubricating oil storage mechanism 200 provided in the rolling bearing 140 will be described. Since the lubricating oil storage mechanism 200 provided in the rolling bearing 130 is substantially the same as the lubricating oil storage mechanism 200 provided in the rolling bearing 140, the description thereof is omitted here.

[Lubricating oil storage mechanism 200]
FIG. 2 is a vertical sectional view of the lubricating oil storage mechanism 200. FIG. 3 is an exploded perspective view of the storage unit 210. In FIG. 3, the guide unit 270 is omitted for ease of understanding.

As shown in FIG. 2, the lubricating oil storage mechanism 200 includes a storage unit 210 and a protrusion 220. The storage unit 210 is connected (fixed) to the differential case 120 and rotates integrally with the differential case 120. The storage unit 210 includes a plurality of storage unit main bodies 300, which will be described later. The projecting portion 220 is provided on the outer ring portion 144 of the rolling bearing 140, and projects outward of the rolling bearing 140 in the rotation axis direction (+ X axis direction in FIG. 2, hereinafter simply referred to as “outward in the rotation axis direction”).

As shown in FIGS. 2 and 3, the storage unit 210 includes a fixed portion 230 (side portion), a plurality of bottom portions 240, a plurality of wall portions 250 (side portions), and a plurality of partition portions 260 (side portions). And a plurality of guide units 270.

The fixing portion 230 has a disk shape, and a circular opening 232 is formed in the center. The inner diameter of the fixed portion 230 (opening 232) is 126 or more of the inner diameter of the differential case 120. The outer diameter of the fixed portion 230 is larger than the inner diameter of the inner ring portion 142, and is substantially equal to the outer diameter of the inner ring portion 142 on the smaller diameter side. The fixed portion 230 is one of the end face 124, which is the end face in the rotation axis direction of the differential case 120 and is opposite to the end face to which the ring gear 110 is connected, and the end face 142a on the small diameter side of the inner ring portion 142 of the rolling bearing 140. Or fixed to both. In the present embodiment, the fixing portion 230 is fixed to the end surface 124 of the differential case 120 with screws 234.

The bottom portion 240 is a flat plate member that is connected (for example, welded) to the fixed portion 230 and extends outward in the rotation axis direction (in the + X axis direction in FIGS. 2 and 3). As shown in FIG. 3, in the present embodiment, six bottom portions 240 are continuously provided, and the six bottom portions 240 form a hexagonal cylinder 242. The hexagonal cylinder 242 is connected to the fixing portion 230 so that the central axis substantially coincides with the rotation axis.

The wall portion 250 is a flat plate member erected from the bottom portion 240 to the inner ring portion 142 in the radial direction (± Z-axis direction in FIGS. 2 and 3). As shown in FIG. 3, in the present embodiment, six wall portions 250 are provided in succession, and the six wall portions 250 are hexagons in which a hexagonal opening 252a is formed in the center of a hexagonal flat plate member. The plate 252 is formed.

The partition portion 260 partitions (divides) the space surrounded by the fixing portion 230, the hexagonal cylinder 242, and the hexagonal plate 252 into a plurality of spaces (six in the present embodiment). In the present embodiment, six partition portions 260 are provided. The partition portion 260 is a plate member erected in the vertical direction from the apex of the hexagonal cylinder 242. The width of the partition portion 260 (the length in the ± X-axis directions in FIGS. 2 and 3) is substantially equal to the width of the bottom portion 240 (the length of the hexagonal cylinder 242). The partition portion 260 is integrally molded with, for example, the bottom portion 240.

That is, the storage unit 210 includes six storage unit bodies 300 including one bottom 240, one wall 250, and two partition 260s. In other words, a plurality (six) of the storage unit main bodies 300 are provided in the circumferential direction of the end faces 142a in the rotation axis direction of the inner ring portion 142.

As shown in FIG. 2, the guide portion 270 is a member extending outward in the rotation axis direction from the tip of the wall portion 250. The tip of the guide portion 270 is located outward in the rotation axis direction with respect to the protruding portion 220.

Subsequently, a mode of storing the lubricating oil by the lubricating oil storage mechanism 200 will be described. FIG. 4 is a front view of the storage unit 210. FIG. 5 is a vertical sectional view of the storage unit 210. Further, in FIGS. 4 (a) and 4 (b), the lubricating oil is shown by cross-hatching. In FIGS. 4 (a) and 4 (b), the bottom portion 240 is shown by a black fill and the wall portion 250 is shown by a broken line for easy understanding. Further, in FIGS. 4 (a) and 4 (b), the guide portion 270 is omitted. Further, in FIG. 5, the lubricating oil is shown in black.

As described above, the storage unit 210 rotates integrally with the differential case 120. When the rotation of the differential case 120 is stopped due to the stop of the vehicle, the rotation of the storage unit 210 is also stopped accordingly. As shown in FIGS. 4A and 4B, at least one of the plurality of bottoms 240 constituting the storage unit 210 is in the vertical direction regardless of the angle (FIG. 4). It extends in the direction intersecting (a) and the ± Z-axis direction in FIG. 4 (b).

Therefore, when the vehicle is stopped, the lubricating oil that falls from the upper portion 14 of the housing 10 and the lubricating oil that has flowed down from the lubricating surface of the rolling bearing 140 are the spaces partitioned by the bottom portion 240, the wall portion 250, and the partition portion 260. It will be stored in (the space surrounded by the broken line in FIGS. 4 (a) and 4 (b)). That is, since the storage unit 210 does not rotate while the vehicle is stopped, at least one of the plurality of storage unit main bodies 300 can continue to store the lubricating oil.

Then, when the vehicle is started, the driving force of the engine is transmitted to the ring gear 110 and the ring gear 110 rotates, the differential case 120 rotates, and the storage unit 210 rotates accordingly.

Then, as shown in FIG. 5A, the lubricating oil stored in the storage unit main body 300 is subjected to centrifugal force to the outer diameter of the inner ring portion 142 (in FIG. 5A, the ± Z-axis direction and the ± Y-axis). Move in the direction). Then, as shown by an arrow in FIG. 5A, the lubricating oil is guided to the lubricating surface of the rolling bearing 140 after colliding with the protruding portion 220. Further, as shown by the arrow in FIG. 5B, the lubricating oil that has not been moved by the centrifugal force falls to the protruding portion 220 due to the weight (gravity) of the lubricating oil and then is guided to the lubricating surface of the rolling bearing 140. Will be lubricated.

In this way, the lubricating oil storage mechanism 200 can supply the lubricating oil to the rolling bearing 140 as the vehicle starts. Then, while the vehicle is being driven (wheels are rotated), centrifugal force is applied to the lubricating oil storage mechanism 200, so that the lubricating oil is not stored.

As described above, the lubricating oil storage mechanism 200 of the present embodiment can store the lubricating oil when the vehicle is stopped. Further, the lubricating oil storage mechanism 200 can supply the stored lubricating oil to the lubricating surface of the rolling bearing 140 when the vehicle is started. That is, the lubricating oil storage mechanism 200 can supply the lubricating oil to the lubricating surface when the rolling bearing 140 starts to rotate. As a result, the lubricating oil storage mechanism 200 can prevent seizure of the lubricating surface and prevent damage to the rolling bearing 140.

Further, the lubricating oil storage mechanism 200 can supply the stored lubricating oil to the lubricating surface of the rolling bearing 140 by rotating the differential case 120 (ring gear 110) without providing a dedicated drive mechanism (actuator or the like). Therefore, the lubricating oil storage mechanism 200 can supply the lubricating oil at low cost.

Further, since the lubricating oil storage mechanism 200 can supply the lubricating oil to the lubricating surface when the rolling bearing 140 starts to rotate, the static oil surface of the lubricating oil is set to the conventional technique (the rolling bearings 130 and 140 are positioned). It is possible to make the height lower than H). As a result, the lubricating oil storage mechanism 200 can reduce the stirring load by the ring gear 110 of the differential device 100, and can suppress the deterioration of fuel efficiency.

Further, the lubricating oil storage mechanism 200 can efficiently store (recover) the lubricating oil that has fallen from the wall surface such as the upper portion 14 of the housing 10 in the storage unit main body 300 by providing the guide unit 270.

Further, the lubricating oil storage mechanism 200 is provided with the protruding portion 220, so that the lubricating oil stored in the storage portion main body 300 can be efficiently supplied to the lubricating surface of the rolling bearing 140.

[Modification example]
FIG. 6 is a diagram illustrating a lubricating oil storage mechanism according to a modified example. FIG. 6A is a diagram illustrating the lubricating oil storage mechanism 400 according to the first modification. FIG. 6B is a diagram for explaining the lubricating oil storage mechanism 500 according to the second modification. FIG. 6C is a diagram illustrating the lubricating oil storage mechanism 600 according to the third modification. In FIG. 6A, the lubricating oil is shown in black.

[First modification]
As shown in FIG. 6A, the lubricating oil storage mechanism 400 according to the first modification includes a storage unit 410 and a protrusion 220. The storage unit 410 includes a fixing portion 430, a plurality of bottom portions 240, a plurality of wall portions 250, a plurality of partition portions 260, and a plurality of guide portions 270. The components substantially the same as the storage unit 210 are designated by the same reference numerals and the description thereof will be omitted.

The fixing portion 430 has a disk shape, and a circular opening is formed in the center. The inner diameter of the fixing portion 430 is smaller than the inner diameter 126 of the differential case 120. The outer diameter of the fixed portion 430 is larger than the inner diameter 126 of the differential case 120 and smaller than the inner diameter of the inner ring portion 142. The fixing portion 430 is fitted into the groove 126a formed in the inner diameter 126 of the differential case 120.

The bottom portion 240 is connected to the fixed portion 430 and extends outward in the rotation axis direction (in the direction of the + X axis in FIG. 6A). Therefore, the bottom 240 of the lubricating oil storage mechanism 400 is longer in the rotation axis direction than the bottom 240 of the lubricating oil storage mechanism 200. Further, a space is formed between the bottom 240 of the lubricating oil storage mechanism 400 and the inner diameter 126 of the differential case 120, and the lubricating oil can be stored in this space as well.

As described above, the lubricating oil storage mechanism 400 of the first modification can store a large amount of lubricating oil as compared with the lubricating oil storage mechanism 200.

[Second variant]
As shown in FIG. 6B, the lubricating oil storage mechanism 500 according to the second modification includes a storage unit 210 and a protrusion 520. The components substantially the same as the storage unit 210 are designated by the same reference numerals and the description thereof will be omitted.

The protruding portion 520 includes a main body 522, a protruding portion 524, and a tapered portion 526. The main body 522 is provided on the outer ring portion 144 of the rolling bearing 140, and projects outward in the rotation axis direction (in the middle of FIG. 6B + X-axis direction). The protruding portion 524 projects inward in the radial direction of the outer ring portion 144 from the tip of the main body 522. The tip of the protrusion 524 is separated from the inner ring 142 (storage unit 210). The tapered portion 526 is continuous from the base end of the protruding portion 524 to the inner diameter side of the outer ring portion 144, and is inclined outward in the radial direction from the protruding portion 524 toward the outer ring portion 144.

As described above, since the lubricating oil storage mechanism 500 of the second modification includes the protruding portion 520 (protruding portion 524), the lubricating oil moved by the centrifugal force is moved to the lubricating surface side of the rolling bearing 140. Can be done. This makes it possible to suppress the movement of the lubricating oil to the outside of the rolling bearing 140. Further, since the lubricating oil storage mechanism 500 includes the tapered portion 526, the lubricating oil can be smoothly supplied to the lubricating surface of the rolling bearing 140.

[Third variant]
As shown in FIG. 6C, the lubricating oil storage mechanism 600 according to the third modification includes a storage unit 610 and a protrusion 220. The storage unit 610 includes a fixing portion 230, a plurality of bottom portions 640, a plurality of wall portions 250, a plurality of partition portions 260, and a plurality of guide portions 270. The components substantially the same as the storage unit 210 are designated by the same reference numerals and the description thereof will be omitted.

The bottom portion 640 is recessed (curved) inward in the radial direction (in the ± Z axis direction in FIG. 6C). As a result, the lubricating oil storage mechanism 600 according to the third modification can store a large amount of lubricating oil as compared with the lubricating oil storage mechanism 200.

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Will be done.

In the above embodiment, the lubricating oil storage mechanism 200 includes six bottoms 240 (six bottoms 240 form a hexagonal cylinder 242) as an example. That is, the configuration in which the lubricating oil storage mechanism 200 includes six storage unit main bodies 300 is given as an example. However, the number of the storage unit main body 300 is not limited as long as it is provided in the circumferential direction of the end face 124 in the rotation axis direction in the differential case 120 or the end face 142a in the rotation axis direction in the inner ring portion 142 of the rolling bearing 140. For example, the lubricating oil storage mechanism 200 may include eight storage unit main bodies 300. In this case, eight bottoms 240 may be provided, and the eight bottoms 240 may form an octagonal cylinder.

Further, in the above embodiment, the case where the outer diameter of the fixed portion 230 is substantially equal to the outer diameter of the inner ring portion 142 has been given as an example. However, the outer diameter of the fixed portion 230 may be smaller than the outer diameter of the inner ring portion 142.

Further, in the above embodiment, a case where a plurality of storage unit main bodies 300 are provided in the circumferential direction of the end surface 142a in the rotation axis direction of the inner ring portion 142 has been described as an example. However, a plurality of storage unit main bodies 300 may be provided in the circumferential direction of the end face 124 in the rotation axis direction in the differential case 120.

Further, in the above embodiment, the configuration in which the storage unit main body 300 includes the guide unit 270 is given as an example. However, the guide unit 270 is not an essential configuration. When the guide portion 270 is not provided, the tip of the wall portion 250 of the storage portion main body 300 may be located outside the protrusion 220 in the rotation axis direction. As a result, the lubricating oil that has fallen from the upper portion 14 of the housing 10 can be efficiently stored (recovered) in the storage unit main body 300.

Further, in the above embodiment, the configuration in which the storage unit main body 300 is provided in the differential case 120 fixed to the small diameter side of the inner ring portion 142 of the rolling bearing 140 has been described as an example. However, the storage portion main body 300 may be provided on the small diameter side of the inner ring portion 142 of the rolling bearing 140. Further, the storage portion main body 300 may be provided in the differential case 120 fixed to the large diameter side of the inner ring portion 142 of the rolling bearing 140 or the large diameter side of the inner ring portion 142.

Further, in the above embodiment, the case where the rolling bearings 130 and 140 are tapered roller bearings has been given as an example. However, the rolling bearings 130 and 140 may be other rolling bearings including an inner ring portion, an outer ring portion, and a rolling element provided between the inner ring portion and the outer ring portion. The rolling bearings 130 and 140 may be, for example, ball bearings, roller bearings, needle bearings, and spherical roller bearings.

Further, in the above embodiment, the differential case 120 is taken as an example as a rotating body main body fixed to the inner ring portion 142 of the rolling bearing 140 and rotating together with the inner ring portion 142. However, the rotating body itself is not limited.

The present invention can be used for a lubricating oil storage mechanism.

200, 400, 500, 600 Lubricating oil storage mechanism 220, 520 Protrusions 240, 640 Bottom 250 Wall (side)
260 partition (side)
270 Guide part 300 Storage part main body

Claims (4)

It is provided with a plurality of storage unit main bodies provided in the circumferential direction of the end face in the rotation axis direction of the rotating body main body fixed to the inner ring portion of the rolling bearing and rotating together with the inner ring portion, or the end face in the rotation axis direction of the inner ring portion.
The main body of the storage unit
A bottom portion connected to the inner ring portion or the rotating body main body and extending outward of the rolling bearing in the rotation axis direction.
A side portion erected radially outward from the bottom portion and the inner ring portion, and
Have,
A lubricating oil storage mechanism in which lubricating oil is stored in a space surrounded by the bottom portion and the side portion. The lubricating oil storage mechanism according to claim 1, wherein the storage unit main body includes a guide portion extending from the tip of the side portion to the outside of the rolling bearing in the direction of the rotation axis. It is provided on the outer ring portion of the rolling bearing, and includes a protruding portion protruding outward of the rolling bearing in the direction of the rotation axis.
The lubricating oil storage mechanism according to claim 1 or 2, wherein the tip of the side portion or the tip of the guide portion of the storage portion main body is located outside the rolling bearing in the rotation axis direction with respect to the protruding portion. The rolling bearing is a tapered roller bearing.
The lubricating oil storage mechanism according to any one of claims 1 to 3, wherein the storage unit main body is provided on the rotating body main body fixed to the small diameter side of the inner ring portion or the small diameter side of the inner ring portion.

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