JP6275947B2 - Lubricating oil outflow suppression device, rotating machine, lubricating oil outflow suppressing method - Google Patents

Description

  The present invention relates to a technique for suppressing the outflow of lubricating oil used in a bearing to the outside.

  In an oil lubricated bearing used for a rotary machine, for example, a pump, the lubricant is scattered by the ball bearing, and the lubricant adheres to the outer periphery of the main shaft or the inner surface of the bearing cover. When the through-hole through which the main shaft passes is formed in the bearing cover, the adhering lubricating oil flows out from the gap between the through-hole of the bearing cover and the main shaft.

  In order to suppress the outflow of such lubricating oil, conventionally, a lip seal has been provided between the penetrating portion of the bearing cover and the main shaft. In the method using the lip seal, the main shaft slides while the lip seal and the main shaft are in contact with each other during the rotation of the main shaft. When the powder enters, the sliding part of the spindle wears out. When the degree of wear increases, the sealing performance deteriorates and the lubricating oil flows out to the outside. As a result, the spindle needs to be replaced.

JP-A-9-196186

  Instead of the lip seal, a labyrinth seal (for example, Patent Document 1 described above) can be used to suppress the outflow of the lubricating oil. For example, a groove called a labyrinth is provided in a through portion of the bearing cover, that is, a surface of the bearing cover that faces the outer surface of the main shaft. According to such a groove structure, the lubricating oil that has entered the gap between the main shaft and the bearing cover stays in the groove due to the surface tension of the lubricating oil and is guided downward along the groove. This groove is formed over almost the entire circumference of the penetrating part, and the bearing side surface of the bearing cover is replaced with the groove at the same depth as the groove, or more than the predetermined width at the bottom. If the notch part cut out at a deep depth is formed, the lubricating oil guided downward along the groove can be guided from the notch part to the oil reservoir. According to such a labyrinth seal, since the oil seal is performed in a state where the bearing cover and the main shaft are not in contact with each other, there is no problem like the lip seal described above.

  However, in the labyrinth seal described above, no groove is formed in the lowermost notch, and therefore the lubricating oil scattered in the notch tends to flow out to the atmosphere side. In addition, the depth of the grooves and the number of grooves are limited due to space restrictions and the like, and if the amount of scattered lubricant is large, there is a possibility that the outflow of the lubricant to the outside cannot be sufficiently suppressed only by the grooves. There is. Such a problem is not limited to the pump, but is common to various rotating machines that employ oil-lubricated bearings. For this reason, there is a need for a technique that can suitably suppress the outflow of the lubricating oil from the oil-lubricated bearing.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as, for example, the following forms.

A first aspect of the present invention is provided as a lubricating oil outflow suppression device for a rotary machine, comprising: a main shaft extending in the axial direction; and a bearing that rotatably supports the main shaft and that uses lubricating oil. Is done. This outflow suppression device is a bearing cover for covering one side of the bearing, and is provided along the circumferential direction on the outer periphery of the main shaft, with the bearing cover having a through hole for the main shaft penetrating in the axial direction. An oil draining ring comprising an oil draining ring provided between the bearing and the bearing cover. An oil relief groove surrounding the outside of the through hole is formed at a position on the inner surface of the bearing cover facing the bearing at least at a position above the center of the through hole.

  According to this lubricating oil outflow suppression device, the lubricating oil scattered from the bearing to the region outside the oil escape groove on the inner surface of the bearing cover is guided to the oil escape groove along the inner surface. Since the lubricating oil guided to the oil escape groove moves below the through hole along the oil escape groove due to gravity, the lubricating oil can be prevented from entering the through hole of the bearing cover. In addition, the oil draining ring blocks the lubricating oil scattered from the bearing toward the region around the main shaft on the inner surface of the bearing cover, that is, the region corresponding to the outer diameter of the oil draining ring. Intrusion into the through hole of the cover can be suppressed. In other words, in the region relatively close to the main shaft, the splashing of the lubricating oil is blocked by the oil drain ring, and in the region relatively far from the main shaft, the scattered lubricating oil is placed below the through hole by the oil relief groove. As a result, it is possible to extremely effectively prevent the lubricating oil from flowing out from the through hole of the bearing cover by combining these two actions.

  As the second mode of the present invention, in the first mode, the outer peripheral end of the surface of the oil escape groove has an inclined surface that obliquely intersects the axis and faces the bearing. Also good. According to this form, it is possible to easily guide the lubricating oil scattered in the region outside the oil relief groove to the oil relief groove.

  As a third mode of the present invention, in the second mode, the angle at which the inclined surface facing the bearing side obliquely intersects the axis may be 30 ° or more and 75 ° or less. According to this aspect, the lubricating oil can be guided over a wide range while ensuring the inclination angle of the oil relief groove that can suitably guide the lubricating oil.

  As a fourth mode of the present invention, in any of the first to third modes, the inner peripheral end of the surface of the oil escape groove is a parallel surface formed parallel to the axis, or the axis It may have an inclined surface that crosses diagonally and faces away from the bearing. According to this configuration, the lubricating oil guided to the oil escape groove is less likely to enter the region inside the oil escape groove.

  As a fifth aspect of the present invention, in any one of the first to fourth aspects, a groove extending from the axis side toward the outer diameter side of the oil drain ring is formed on the bearing cover surface of the oil drain ring. A plurality may be formed along the circumferential direction. According to such a configuration, the groove of the oil drain ring functions in the same manner as the impeller of the pump. Therefore, even if the lubricant enters between the inner surface of the bearing cover and the oil drain ring, the lubricant does not generate centrifugal force. It becomes easy to discharge in the direction away from the main axis. As a result, the lubricating oil can be further suppressed from flowing out from the through hole of the bearing cover.

  As a sixth aspect of the present invention, in the fifth aspect, the groove of the oil draining ring may be open on the outer peripheral side and closed on the inner peripheral side. According to this configuration, it is possible to further suppress the lubricant oil adhering to the bearing cover side surface of the oil drain ring from entering the main shaft side, that is, the through hole side.

  As a seventh aspect of the present invention, in any one of the first to sixth aspects, the circumferentially outer end face in the orthogonal direction orthogonal to the axis of the oil draining ring and the top part on the inner peripheral side of the oil relief groove , They may be at the same position in the radial direction. According to this configuration, the oil drain ring blocks the scattered lubricant in the entire area inside the oil relief groove on the inner surface of the bearing cover, so that the lubricant enters the through hole of the bearing cover. This can be further suppressed.

As an eighth aspect of the present invention, in any one of the first to seventh aspects, a groove that forms a labyrinth seal is formed along the circumferential direction on the surface that forms the through hole of the bearing cover. Below the surface to be formed, a notch portion that is notched on the bearing side and that communicates with a groove constituting the labyrinth seal may be formed. According to such a configuration, even if the lubricating oil outflow suppression device allows a small amount of lubricating oil to enter the through hole, the lubricating oil is captured by the labyrinth seal, so that the lubricating oil flows out to the outside. This can be further suppressed.

  A ninth aspect of the present invention is provided as a rotating machine including a main shaft, a bearing, and the lubricating oil outflow suppression device according to any one of the first to eighth aspects. According to such a rotating machine, the same effects as those of the first to eighth embodiments can be obtained.

  According to a tenth aspect of the present invention, in a rotary machine including a main shaft that extends in the axial direction and a bearing that rotatably supports the main shaft and that uses lubricating oil, the outflow of the lubricating oil is suppressed. Provided as a method. This method is a bearing cover for covering one side of the bearing, and is formed from at least the center of the through hole at a portion facing the bearing on the inner surface of the bearing cover in which a through hole for the main shaft to penetrate in the axial direction is formed. Also, the oil escape groove that surrounds the outside of the through hole formed at the upper position causes the lubricating oil scattered on the outer portion of the bearing cover inner surface to be outside the outer groove of the bearing cover. An oil draining ring that is provided along the circumferential direction on the outer periphery of the main shaft, and that is provided between the bearing and the bearing cover. Thus, the lubricating oil is prevented from splashing to the inner portion, thereby suppressing the lubricating oil from flowing out from the through hole. According to this method, the same effect as that of the first embodiment is obtained.

  The present invention is not limited to the above-described form, and can be realized as a bearing cover, an oil drain ring, or the like.

It is sectional drawing which shows schematic structure of the pump as one Example of this invention. It is sectional drawing which shows schematic structure of a lubricating oil outflow suppression apparatus. It is explanatory drawing which shows schematic structure of a bearing cover. It is explanatory drawing which shows schematic structure of an oil draining ring.

  A. Example:

  FIG. 1 is a cross-sectional view showing a schematic configuration of a pump 20 as an embodiment of the present invention. As shown in the figure, a pump 20 as an example of a rotating machine includes a main shaft 30, a bearing casing 40, bearings 51 and 52, and a lubricant oil outflow suppression device 80. In the bearing casing 40, the main shaft 30 is formed extending along the axis AL direction orthogonal to the vertical (gravity) direction, and an impeller 35 is fixed around the main shaft 30 at one end thereof. On the other end side of the main shaft 30, the main shaft 30 is cantilevered by bearings 51 and 52. An electric motor (not shown) is connected ahead of the bearing 52 on the other end side of the main shaft 30. With such a configuration, the main shaft 30 and the impeller 35 rotate about the axis AL as the rotation center axis.

  The bearings 51 and 52 are ball bearings that use lubricating oil. An oil reservoir 41 is formed by the bearing casing 40 between the bearing 51 and the bearing 52. In the present embodiment, the oil level OL in the oil reservoir 41 is maintained in the vicinity of the center of the ball when the balls constituting the bearings 51 and 52 are positioned at the lowest position.

The bearing casing 40 terminates at the position of the bearing 52 on the other end side of the main shaft 30, so that the outside of the bearing 52 (the side opposite to the bearing 51) is exposed from the bearing casing 40. One side of the bearing 52, that is, the exposed portion is covered with a bearing cover 60. In the present embodiment, the bearing cover 60 has a bottomed cylindrical cup shape. The end of the bearing cover 60 opposite to the bottom is formed in a flange shape, whereby the bearing cover 60 is attached to the bearing casing 40. A through hole 61 penetrating in the direction of the axis AL is formed at the bottom of the bearing cover 60. The main shaft 30 extends through the through hole 61 to the outside of the bearing cover 60.

  An oil drain ring 70 is provided between the bearing 52 and the bearing cover 60 on the outer periphery of the main shaft 30 along the circumferential direction. The bearing cover 60 and the oil draining ring 70 function as a lubricating oil outflow suppression device 80 that suppresses the lubricating oil scattered from the bearing 52 from flowing out to the outside (motor side) when the main shaft 30 rotates.

  FIG. 2 is a partially enlarged view of FIG. 1 showing a schematic configuration around the bearing 52 and the lubricating oil outflow suppression device 80. FIG. 3 shows a schematic configuration of the bearing cover 60. 3A is a cross-sectional view of the bearing cover 60 in the same cross section as FIG. 2, and FIG. 3B is an arrow view of the inner surface of the bearing cover 60 (the surface on the bearing 52 side). FIG. 4 shows a schematic configuration of the oil drain ring 70. 4A is a cross-sectional view of the oil drain ring 70 in the same cross section as FIG. 2, and FIG. 4B is an arrow view of the oil drain ring 70 viewed from the side where the bearing cover 60 is attached. is there.

  As shown in FIGS. 2 and 3, an oil relief groove 62 is formed in a portion of the inner surface of the bearing cover 60 that faces the bearing 52. In the present embodiment, the part is formed as a plane orthogonal to the axis AL. The oil escape groove 62 surrounds the outside of the through hole 61 and is formed in an annular shape. The oil escape groove 62 has a top part 62a that is an end point on the outer peripheral side of the groove, a top part 62b that is an end point on the inner peripheral side of the groove, and a bottom part 62c that is the deepest part of the groove. .

  The outer peripheral end of the surface of the oil relief groove 62 (surface forming the groove), that is, the periphery of the top 62a, is an inclined surface that faces the bearing 52 side and obliquely intersects the axis AL at an angle θ. have. In the present embodiment, the surface between the top portion 62a and the bottom portion 62c of the oil escape groove 62 is not limited to the end portion on the outer peripheral side, but extends from the top portion 62a to the bottom portion 62c at an angle θ with respect to the axis AL. In other words, it is formed so as to approach the axis AL as it goes from the top 62a to the bottom 62c. In this embodiment, the angle θ is a constant value from the top 62a to the bottom 62c. According to the shape of the oil relief groove 62, the outer side of the inner surface of the bearing cover 60 is outside the groove 62 at a position above (in the vertical direction) the center of the through hole 61 (position through which the axis AL passes). It is easy to guide the lubricating oil scattered on the side surface 63 to the oil escape groove 62, more specifically to the bottom 62c. Further, at a position below the center of the through hole 61, the lubricating oil in the oil release groove 62 can be easily guided to the outside of the oil release groove 62, that is, below the through hole 61.

  In order to guide the lubricating oil over a wide range while ensuring the inclination angle of the surface of the oil relief groove 62 that can guide the lubricating oil suitably, the angle θ should be 30 ° or more and 75 ° or less. desirable. In the present embodiment, the angle θ is 45 °. The angle θ may change depending on the position.

An end portion on the inner peripheral side of the surface of the oil escape groove 62, that is, the periphery of the top portion 62b is formed in parallel to the axis AL. In the present embodiment, the surface between the top portion 62b and the bottom portion 62c of the oil escape groove 62 is not limited to the end portion on the inner peripheral side, and is formed in parallel to the axis AL from the top portion 62b to the bottom portion 62c. Yes. According to the shape of the oil relief groove 62, the lubricating oil guided to the oil relief groove 62 is less likely to enter the inner side surface 64 inside the oil relief groove 62. However, the inner peripheral end of the surface of the oil relief groove 62 may be formed as an inclined surface that obliquely intersects the axis AL and faces the opposite side of the bearing 52. That is, the inner peripheral end of the surface of the oil escape groove 62 may be formed so as to approach the axis AL as it goes from the top 62b to the bottom 62c. Furthermore, the surface between the top part 62b and the bottom part 62c may be formed as an inclined surface facing the side opposite to the bearing 52 that obliquely intersects the axis AL from the top part 62b to the bottom part 62c. . These configurations also have the same effect as the configuration parallel to the axis AL described above.

  According to the oil release groove 62 described above, when the lubricating oil scattered on the outer side surface 63 outside the oil release groove 62 moves downward along the outer side surface 63 by gravity, the lubricating oil can be captured. The lubricating oil trapped in the oil release groove 62 moves below the through hole 61 along the annular oil release groove 62 by gravity and returns to the oil reservoir 41. Therefore, it is possible to suppress the lubricating oil scattered on the outer surface 63 from entering the through hole 61 of the bearing cover 60 and flowing out to the outside through the gap between the main shaft 30 and the surface forming the through hole 61 of the bearing cover 60. .

  As shown in FIG. 4, a through hole 74 having a diameter substantially the same as the diameter of the main shaft 30 is formed in the center portion of the oil drain ring 70. In this embodiment, the oil drain ring 70 is fixed to the main shaft 30 by passing the main shaft 30 through the through hole 74 and then screwing. For this reason, when the main shaft 30 rotates, the oil drain ring 70 rotates together with the main shaft 30.

As shown in FIGS. 2 and 4, the oil drain ring 70 includes a first portion 71 extending along the axis AL direction, and a first portion 71 that protrudes in a flange shape from the outer surface of the first portion 71 outward in the radial direction. 2 parts 72. As shown in FIG. 2, the first portion 71 is formed so as to extend almost over the entire area between the bearing cover 60 and the bearing 52, leaving a slight gap between the first portion 71 and the inner surface 64 of the bearing cover 60. Yes. The end of the first portion 71 on the bearing 52 side in the direction of the axis AL is in contact with the inner ring of the bearing 52. According to this configuration, the lubricating oil scattered from the bearing 52 toward the main shaft 30 is blocked by the first portion 71 and is blown outward in the radial direction by the centrifugal force of the rotating first portion 71. For this reason, the lubricating oil adheres to the main shaft 30, and the lubricating oil moves along the main shaft 30 in the direction toward the bearing cover 60 and does not flow out to the outside.

  As shown in FIG. 2, the second portion 72 is formed at a position close to the inner surface 64 of the bearing cover 60, in other words, at the end portion on the bearing cover 60 side in the axis AL direction of the first portion 71. ing. The height of the oil drain ring 70 in the radial direction is a range in which the end surface 72a on the outer side in the circumferential direction of the second portion 72 is not in contact with the oil level OL. In this way, when the oil drain ring 70 rotates together with the main shaft 30, the second portion 72 does not come into contact with the oil level OL and the lubricating oil does not scatter.

  According to the oil draining ring 70 described above, the lubricating oil splashed toward the region corresponding to the outer diameter of the oil draining ring 70 (second portion 72), that is, the inner surface 64 is blocked by the oil draining ring 70. Therefore, the scattered lubricating oil can be prevented from landing on the inner surface 64. Accordingly, the lubricating oil lands on the inner side surface 64, the lubricating oil enters the through hole 61 of the bearing cover 60, and flows out to the outside through a gap between the main shaft 30 and the surface forming the through hole 61 of the bearing cover 60. Can be suppressed.

Furthermore, in the present embodiment, as shown in FIG. 2, the end surface 72a on the outer side in the circumferential direction of the oil draining ring 70 and the top portion 62b on the inner peripheral side of the oil relief groove 62 are at the same position in the radial direction. In other words, in the surface direction orthogonal to the axis AL, the entire area of the inner surface 64 inside the groove 62 is blocked by the oil drain ring 70 from scattering of the lubricating oil. This is combined with the fact that the lubricating oil scattered on the outer side surface 63 outside the oil escape groove 62 is prevented from entering the through hole 61 by the groove 62, and the effect of suppressing the outflow of the lubricating oil to the outside is remarkably increased. Make it big. Further, since the lubricating oil is less likely to enter the gap between the bearing cover 60 and the oil drain ring 70 as compared with the case where the top portion 62b is closer to the axis AL than the end surface 72a, the intrusion of the lubricating oil into the through hole 61 is suppressed. The However, the configuration in which the top portion 62b is closer to the axis AL than the end surface 72a is not excluded. Similarly, the configuration in which the end surface 72a is closer to the axis AL than the top 62b is not excluded.

  As shown in FIGS. 2 and 4, the surface of the second portion 72 of the oil drain ring 70 on the bearing cover 60 side (the surface facing the inner surface 64) is outside the oil drain ring 70 from the axis AL side. A groove 73 extending toward the radial side is formed. In the present embodiment, the groove 73 extends in the radial direction. A plurality of the grooves 73 are formed along the circumferential direction. FIG. 4B shows an example in which six grooves 73 are formed at equiangular intervals in the circumferential direction. Since the groove 73 is formed, the shape of the groove 73 performs the same function as the impeller of the pump when the oil draining ring 70 rotates together with the main shaft 30. Even if the lubricating oil enters between them, the lubricating oil is easily discharged in a direction away from the main shaft 30 (through hole 61) by centrifugal force. As a result, the lubricating oil can be further suppressed from flowing out from the through hole 61.

  Moreover, as shown in FIG. 4, the groove 73 formed in the oil drain ring 70 is open on the outer peripheral side and closed on the inner peripheral side. That is, the groove end 73 a that is the outer peripheral end of the groove 73 extends to the outer surface of the surface of the oil drain ring 70 on the bearing cover 60 side, and the groove end 73 b that is the inner peripheral end of the groove 73. Is terminated before reaching the through hole 74. According to this configuration, it is possible to further suppress the lubricating oil from entering the through hole 74 side, that is, the main shaft 30 side. In the present embodiment, the groove end 73b has a semicircular shape.

  Here, the description is returned to the bearing cover 60. As shown in FIGS. 2 and 3, at least one (here, two) grooves 65 are formed along the circumferential direction on the surface of the bearing cover 60 where the through hole 61 is formed. The groove 65 constitutes a labyrinth seal. In addition, a notch 66 is formed below the surface of the bearing cover 60 where the through hole 61 is formed. The groove 65 is formed in an annular shape except for the region where the notch 66 is formed, and communicates with the notch 66 at the lower end thereof. According to such a configuration, even if the configuration of the oil relief groove 62 and the oil drain ring 70 described above allows a small amount of the lubricant to enter the through hole 61, the lubricant oil is captured by the notch 66. Since the oil is returned to the oil reservoir 41 via the notch 66, the lubricating oil can be further prevented from flowing out.

  According to the pump 20 provided with the lubricating oil outflow suppression device 80 described above, the amount of lubricating oil entering the groove 65 constituting the labyrinth seal is significantly reduced. Further, the lubricating oil does not scatter in the notch 66. Therefore, the outflow of the lubricating oil can be significantly suppressed as compared with the configuration in which the outflow of the lubricating oil is suppressed only by the labyrinth seal. In a demonstration test using the lubricating oil outflow suppression device 80 combined with the labyrinth seal, it was confirmed that the lubricating oil did not flow out to the outside at all.

B. Variations:
B-1. Modification 1:
The oil release groove 62 is not necessarily formed in an annular shape. The oil escape groove 62 only needs to surround the outside of the through hole 61 at a position above the center of the through hole 61 in order to suppress the penetration of the lubricating oil into the through hole 61. For example, the oil escape groove 62 may have an inverted U shape or an arc shape that terminates below the center of the through hole 61. Even with such a shape, the lubricating oil is difficult to move in the direction opposite to the direction of gravity, that is, upward, so that the penetration of the lubricating oil into the through hole 61 can be suitably suppressed.

Moreover, the cross-sectional shape of the oil escape groove 62 is not limited to the above-described example, and may be various shapes. For example, the outer peripheral end and the inner peripheral end of the oil relief groove 62 may be cut in parallel to the axis AL up to the bottom surface formed as a plane orthogonal to the axis AL. . Alternatively, a plane parallel to the axis AL or a plane orthogonal to the axis AL may be partially formed in the middle between the top 62a and the bottom 62c. Alternatively, there may be an uneven shape in the middle between the top 62b and the bottom 62c.

B-2. Modification 2:
The oil relief groove 62 and the oil draining ring 70 described above exhibit a remarkable lubricating oil outflow suppressing effect by combining both of them, but only one of them can be used alone. For example, the above oil relief groove 62 and labyrinth seal may be combined. Even if it does in this way, compared with the case where the outflow of lubricating oil is suppressed only by the labyrinth seal, the lubricating oil outflow suppressing effect can be enhanced. In this case, the oil relief groove 62 is desirably provided in the vicinity of the through hole 61.

B-3. Modification 3:
The shape of the groove 73 of the oil drain ring 70 can be an arbitrary shape. For example, the groove end 73b may terminate in a rectangular shape. Alternatively, the groove end 73b may be opened in the same manner as the groove end 73a. Of course, the groove 73 may not be formed.

B-4. Modification 4:
The above-described configuration for suppressing the outflow of the lubricating oil is not limited to the pump 20 and can be applied to various rotating machines including a bearing using the lubricating oil, such as a compressor and a blower.

  The embodiments of the present invention have been described above based on some examples. However, the above-described embodiments of the present invention are for facilitating the understanding of the present invention and limit the present invention. It is not a thing. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. Moreover, in the range which can solve at least one part of the subject mentioned above, or the range which exhibits at least one part of an effect, the combination of each component described in the claim and the specification, or omission is possible. .

DESCRIPTION OF SYMBOLS 20 ... Pump 30 ... Main shaft 35 ... Impeller 40 ... Bearing casing 41 ... Oil sump 51, 52 ... Bearing 60 ... Bearing cover 61 ... Through-hole 62 ... Oil relief groove 62a, 62b ... Top part 62c ... Bottom part 63 ... Outer surface 64 ... Inner side surface 65 ... groove 66 ... notch 70 ... oil drain ring 71 ... first part 72 ... second part 72a ... end face 73 ... groove 73a, 73b ... groove end 74 ... through hole 80 ... lubricating oil outflow suppression device AL ... Axis OL ... Oil level

Claims (6)

A lubricating oil outflow suppression device for a rotary machine, comprising: a main shaft extending in the axial direction; and a bearing that rotatably supports the main shaft, the bearing using lubricating oil,
A bearing cover for covering one side of the bearing, the bearing cover having a through hole for the main shaft to penetrate in the axial direction;
An oil draining ring provided along the circumferential direction on the outer periphery of the main shaft, the oil draining ring provided between the bearing and the bearing cover,
An oil relief groove that surrounds the outside of the through hole is formed at a position at least above the center of the through hole in a portion facing the bearing on the inner surface of the bearing cover,
The oil draining ring includes a first part, and a second part provided at an end of the first part on the bearing cover side and projecting radially outward from an outer surface of the first part. Have
The end surface on the outer side in the circumferential direction of the oil draining ring and the top portion on the inner circumferential side of the oil relief groove are at the same position in the radial direction,
The end portion on the bearing side of the oil draining ring is in contact with the inner ring of the bearing,
Lubricant spill suppression device. The lubricating oil spill suppression device according to claim 1,
An end portion on the outer peripheral side of the surface of the oil relief groove has an inclined surface that obliquely intersects with the axis and faces the bearing. The lubricating oil outflow suppression device according to claim 1 or 2,
An end on the inner peripheral side of the surface of the oil relief groove is a parallel surface formed parallel to the axis, or an inclination facing the side opposite to the bearing that obliquely intersects the axis. Lubricant spill suppression device having a surface. The lubricating oil outflow suppression device according to any one of claims 1 to 3,
A lubricating oil outflow suppression device, wherein a plurality of grooves extending from the axis side toward the outer diameter side of the oil drain ring are formed along a circumferential direction on a surface of the bearing cover of the oil drain ring. The rotary machine provided with the said main axis | shaft, the said bearing, and the lubricating oil outflow suppression apparatus as described in any one of Claims 1 thru | or 4 . In a rotary machine comprising a main shaft extending in the axial direction and a bearing that rotatably supports the main shaft and using the lubricating oil, a method for suppressing the outflow of the lubricating oil,
A bearing cover for covering one side of the bearing, wherein at least the center of the through hole in a portion facing the bearing on the inner surface of the bearing cover in which a through hole for allowing the main shaft to penetrate in the axial direction is formed The lubricating oil splashed to the outer part of the inner surface of the bearing cover, which is outside the oil escaping groove, is transferred to the inner surface by the oil escaping groove that surrounds the outer side of the through hole. The inner surface of the bearing cover is prevented from entering the inner portion of the oil relief groove,
An oil draining ring provided on the outer periphery of the main shaft along the circumferential direction, provided between the bearing and the bearing cover, and a first part and the bearing of the first part A second portion that is provided at an end on the cover side and protrudes radially outward from the outer surface of the first portion, and an end surface on the outer side in the circumferential direction of the oil draining ring is the oil relief groove. The lubricating oil is placed in the inner portion by an oil draining ring that is at the same position in the radial direction as the top of the inner peripheral side of the oil draining ring and an end on the bearing side of the oil draining ring is in contact with the inner ring of the bearing By suppressing the scattering of
A method of suppressing the outflow of the lubricating oil that suppresses the outflow of the lubricating oil from the through hole.

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