Oil guide and supercharger

Abstract

The oil guide (70) includes: a cylindrical portion (71); a first guide surface (73) that extends radially outward from the cylindrical portion (71); and a second guide surface (76) that is located radially outside the cylindrical portion (71) and extends in a direction intersecting with the outer peripheral surface (71a) of the cylindrical portion (71) and the first guide surface (73).

Description

Technical Field

[0001] The present disclosure relates to an oil guide and a supercharger. This application claims the benefit of priority based on Japanese Patent Application No. 2020-147394 filed on September 2, 2020, the content of which is incorporated herein by reference. Background Art

[0002] In various devices, bearings for axially supporting a shaft are used. For example, Patent Document 1 discloses a supercharger that includes a bearing for axially supporting a shaft. Lubricating oil is supplied to the bearing for a supercharger or the like.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent No. 5807436 Gazette Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] The lubricating oil supplied to the inside of the bearing scatters from the thrust bearing surface of the bearing as the shaft rotates. The lubricating oil scattered from the bearing is discharged from the oil drain port of the housing provided with the bearing. Here, if the oil drainage property of the lubricating oil deteriorates, the oil seal performance (i.e., the sealing performance at the sealing portion of the lubricating oil in the device) deteriorates. Therefore, it is desired to improve the oil drainage property.

[0008] An object of the present invention is to provide an oil guide and a supercharger capable of improving the oil drainage property.

[0009] Solutions to the Problems

[0010] To solve the above problems, the oil guide of the present invention includes: a cylindrical portion; a first guide surface that extends radially outward from the cylindrical portion; and a second guide surface that is located radially outside the cylindrical portion and extends in a direction intersecting the outer peripheral surface and the first guide surface of the cylindrical portion.

[0011] Alternatively, an inclined surface may be provided on one end side of the cylindrical portion, and the inclined surface inclines toward the side opposite to the first guide surface side as it advances radially outward, and the first guide surface and the inclined surface are connected to each other via the second guide surface.

[0012] Alternatively, the second guide surface may extend substantially parallel to the axial direction of the cylindrical portion.

[0013] Alternatively, the second guide surface may extend substantially parallel to the radial direction of the cylindrical portion.

[0014] Alternatively, the second guide surface may be inclined with respect to at least one of the axial direction and the radial direction of the cylindrical portion.

[0015] Alternatively, the two second guiding surfaces may be respectively disposed at different positions in the circumferential direction of the cylindrical portion.

[0016] To solve the above problems, the supercharger of the present disclosure includes the above-described oil guide.

[0017] Advantages of the Invention

[0018] According to the present disclosure, the oil drainage performance can be improved. Description of the Drawings

[0019] Figure 1 is a schematic cross-sectional view of the supercharger of the present embodiment.

[0020] Figure 2 is a drawing of the dotted line portion extracting Figure 1 thereof.

[0021] Figure 3 is a front view of the oil guide of the present embodiment viewed from the bearing side.

[0022] Figure 4 is a perspective view of the oil guide of the present embodiment viewed from the bearing side.

[0023] Figure 5 is a front view of the oil guide of the first modification viewed from the bearing side.

[0024] Figure 6 is a perspective view of the oil guide of the first modification viewed from the bearing side.

[0025] Figure 7 is a front view of the oil guide of the second modification viewed from the bearing side.

[0026] Figure 8 is a perspective view of the oil guide of the second modification viewed from the bearing side. Detailed Description of the Embodiment

[0027] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding, and do not limit the present disclosure except in the case of special description. Note that in this specification and the drawings, elements having substantially the same function and structure are denoted by the same reference numerals, and repeated descriptions of these elements are omitted, and illustrations of elements not directly related to the present disclosure are omitted.

[0028] Figure 1 is a schematic cross-sectional view of the supercharger C of the present embodiment. Hereinafter, Figure 1 the direction of the arrow L shown will be described as the left side of the supercharger C. The direction of the arrow R shown Figure 1 will be described as the right side of the supercharger C. As Figure 1As shown, the supercharger C includes a supercharger main body 1. The supercharger main body 1 includes a bearing housing 20. The turbine housing 3 is connected to the left side of the bearing housing 20 through a fastening mechanism 2. The compressor housing 5 is connected to the right side of the bearing housing 20 through fastening bolts 4. The bearing housing 20, the turbine housing 3, and the compressor housing 5 are integrated.

[0029] On the outer peripheral surface of the bearing housing 20, there is a protrusion 20a. The protrusion 20a is provided near the turbine housing 3. The protrusion 20a protrudes in the radial direction of the bearing housing 20. On the outer peripheral surface of the turbine housing 3, there is a protrusion 3a. The protrusion 3a is provided near the bearing housing 20. The protrusion 3a protrudes in the radial direction of the turbine housing 3. The bearing housing 20 and the turbine housing 3 are installed by belt-fastening the protrusions 20a and 3a through the fastening mechanism 2. The fastening mechanism 2 is, for example, a G-coupling that clamps the protrusions 20a and 3a.

[0030] The bearing housing 20 has a bearing wall portion 21. A bearing hole 21a is formed in the bearing wall portion 21. The bearing hole 21a penetrates in the left-right direction of the supercharger C. A bearing 30 is provided in the bearing hole 21a. Figure 1 It shows a semi-floating bearing as an example of the bearing 30. However, the bearing 30 can be other bearings as long as it has at least one thrust bearing surface. The shaft 6 is supported by the bearing 30 so as to rotate freely. A turbine impeller 7 is assembled at the left end portion of the shaft 6. The turbine impeller 7 is rotatably accommodated in the turbine housing 3. A compressor impeller 8 is assembled at the right end portion of the shaft 6. The compressor impeller 8 is rotatably accommodated in the compressor housing 5. A discharge port 22 for discharging the lubricating oil scattered from the bearing 30 is formed at the lower portion of the bearing housing 20.

[0031] An air inlet 9 is formed in the compressor housing 5. The air inlet 9 opens on the right side of the supercharger C. The air inlet 9 is connected to an air cleaner (not shown). A diffuser flow path 10 is formed by the opposing surfaces of the bearing housing 20 and the compressor housing 5. The diffuser flow path 10 is formed in a ring shape from the radially inner side of the shaft 6 toward the outer side. The diffuser flow path 10 communicates with the air inlet 9 via the compressor impeller 8 at the radially inner side.

[0032] A compressor scroll flow path 11 is provided in the compressor housing 5. The compressor scroll flow path 11 is in a ring shape. The compressor scroll flow path 11 is, for example, located on the radially outer side of the shaft 6 relative to the diffuser flow path 10. The compressor scroll flow path 11 communicates with an air inlet of an engine (not shown). The compressor scroll flow path 11 also communicates with the diffuser flow path 10.

[0033] If the compressor impeller 8 rotates, air is inhaled from the air inlet 9 into the compressor housing 5. The inhaled air is pressurized and accelerated while flowing between the blades of the compressor impeller 8. The pressurized and accelerated air is further pressurized in the diffuser flow path 10 and the compressor scroll flow path 11. The pressurized air is then guided to the air inlet of the engine.

[0034] An exhaust port 12 is formed in the turbine housing 3. The exhaust port 12 opens on the left side of the supercharger C. The exhaust port 12 is connected to an exhaust gas purification device (not shown). A flow path 13 and a turbine scroll flow path 14 are provided in the turbine housing 3. The turbine scroll flow path 14 is annular. The turbine scroll flow path 14 is located, for example, radially outside the flow path 13 with respect to the turbine impeller 7. The turbine scroll flow path 14 communicates with a gas inlet (not shown). The exhaust gas discharged from the exhaust manifold of the engine (not shown) is guided to the gas inlet. The turbine scroll flow path 14 also communicates with the turbine impeller 7 via the above-mentioned flow path 13.

[0035] The exhaust gas guided from the gas inlet to the turbine scroll flow path 14 is guided to the exhaust port 12 via the flow path 13 and the turbine impeller 7. The exhaust gas guided to the exhaust port 12 causes the turbine impeller 7 to rotate during its flow. The rotational force of the turbine impeller 7 is transmitted to the compressor impeller 8 via the shaft 6. As described above, the air is pressurized by the rotational force of the compressor impeller 8 and guided to the air inlet of the engine.

[0036] Figure 2 is a diagram of the dotted line portion that extracts Figure 1 As shown in Figure 2 an oil passage 23 is formed in the bearing housing 20. The oil passage 23 penetrates from the outside of the bearing housing 20 to the bearing hole 21a. Lubricating oil flows into the bearing hole 21a from the oil passage 23. An insertion hole 32 is formed in the main body portion 31 of the bearing 30. The insertion hole 32 penetrates along the axial direction of the shaft 6 (hereinafter, also simply referred to as the axial direction). The central axis CA of the bearing 30 extends in the left-right direction. The shaft 6 is inserted into the insertion hole 32. Two radial bearing surfaces 34, 35 are formed on the inner peripheral surface 33 of the insertion hole 32. The radial bearing surfaces 34, 35 are separated in the axial direction.

[0037] An oil hole 36 is formed in the main body portion 31 of the bearing 30. The oil hole 36 penetrates the main body portion 31 from the inner peripheral surface 33 to the outer peripheral surface 37. A part of the lubricating oil supplied to the bearing hole 21a flows into the inner peripheral surface 33 of the main body portion 31 through the oil hole 36. The flowing lubricating oil diffuses left and right in Figure 2 and is supplied to the gaps between the shaft 6 and the radial bearing surfaces 34, 35. Moreover, the shaft 6 is axially supported by the oil film pressure of the lubricating oil supplied to the gaps between the shaft 6 and the radial bearing surfaces 34, 35.

[0038] A through-hole 38 is formed in the main body portion 31 of the bearing 30. The through-hole 38 penetrates the main body portion 31 from the inner peripheral surface 33 to the outer peripheral surface 37. A pin hole 21b is formed in the bearing wall portion 21. The pin hole 21b is formed at a position opposed to the through-hole 38. The pin hole 21b penetrates the wall portion forming the bearing hole 21a. In Figure 2 , the positioning pin 50 is fitted into the pin hole 21b from the lower side. The front end of the positioning pin 50 is inserted into the through-hole 38 of the bearing 30. The rotation and axial movement of the bearing 30 are restricted by the positioning pin 50.

[0039] An oil retaining member 60 is mounted on the shaft 6. The oil retaining member 60 is arranged on the right side (compressor impeller 8 side) with respect to the main body portion 31 in Figure 2 . The oil retaining member 60 is an annular member. The oil retaining member 60 causes the lubricating oil flowing along the shaft 6 toward the compressor impeller 8 side to scatter radially outward. The oil retaining member 60 is used to suppress the leakage of the lubricating oil toward the compressor impeller 8 side. The left end face, i.e., the opposed face 61 of the oil retaining member 60 is axially opposed to the main body portion 31.

[0040] A large-diameter portion 6a is provided on the shaft 6. The large-diameter portion 6a is located on the left side (turbine impeller 7 side) with respect to the main body portion 31 in Figure 2 . The large-diameter portion 6a is axially opposed to the main body portion 31.

[0041] As described above, the axial movement of the main body portion 31 of the bearing 30 is restricted by the positioning pin 50. The main body portion 31 is axially clamped by the oil retaining member 60 and the large-diameter portion 6a. Lubricating oil is supplied to the gap between the main body portion 31 and the oil retaining member 60, and the gap between the main body portion 31 and the large-diameter portion 6a respectively. When the shaft 6 moves axially, the oil retaining member 60 or the large-diameter portion 6a is supported by the oil film pressure between them and the main body portion 31. The axially opposite end faces of the main body portion 31 in the bearing 30 become thrust bearing surfaces 41, 42. The thrust bearing surfaces 41, 42 bear the thrust load. The left thrust bearing surface 41 of the thrust bearing surfaces 41, 42 is opposed to the large-diameter portion 6a. The right thrust bearing surface 42 of the thrust bearing surfaces 41, 42 is opposed to the oil retaining member 60.

[0042] Damping portions 39, 40 are respectively formed on both axial end sides of the outer peripheral surface of the main body portion 31. The damping portions 39, 40 suppress the vibration of the shaft 6 by the oil film pressure of the lubricating oil supplied to the gap between the inner peripheral surface of the bearing hole 21a.

[0043] An oil guide 70 is provided on the right side with respect to the thrust bearing surface 42 of the bearing 30. The oil guide 70 is an annular member. The oil guide 70 and the bearing 30 are arranged coaxially. The oil guide 70 covers the outer peripheral edge of the left end portion of the oil retaining member 60 (i.e., the portion forming the opposed surface 61). The oil retaining member 60 can rotate relative to the oil guide 70. The oil guide 70 is mounted on the sealing plate 80. The sealing plate 80 blocks the space between the outer peripheral surface of the oil retaining member 60 and the inner wall surface of the bearing housing 20, suppressing the leakage of lubricating oil from the space inside the bearing housing 20 to the space inside the compressor housing 5. The lubricating oil scattered from the thrust bearing surface 42 of the bearing 30 is blocked by the oil guide 70 and guided to the discharge port 22 at the lower part of the bearing housing 20 (refer to Figure 1 ). Thus, the leakage of lubricating oil to the compressor impeller 8 side can be suppressed more effectively.

[0044] Hereinafter, based on Figure 2 , with reference to Figure 3 and Figure 4 , the details of the oil guide 70 will be described. Figure 3 FIG. Figure 4 is a front view of the oil guide 70 of the present embodiment as viewed from the bearing 30 side. Figure 2 , Figure 3 and Figure 4 , the flow of the lubricating oil scattered from the thrust bearing surface 42 of the bearing 30 is indicated by arrows F1, F2, F3, F4, F5, F6.

[0045] As shown in Figures 2 to 4 , the oil guide 70 has a cylindrical portion 71, a flat portion 72, a first guide surface 73, an inclined surface 74, and second guide surfaces 75, 76. The oil guide 70 is integrally formed by stamping, for example. However, the oil guide 70 may also be formed by joining a plurality of components.

[0046] The cylindrical portion 71 and the bearing 30 are arranged coaxially. The flat portion 72 extends radially inward from the left end portion of the cylindrical portion 71. The flat portion 72 covers the outer peripheral edge of the left end portion of the oil retaining member 60 (i.e., the portion forming the opposed surface 61).

[0047] The first guide surface 73 extends radially outward from the cylindrical portion 71 (specifically, the outer peripheral edge on the right end side). The first guide surface 73 is formed along the circumferential direction of the cylindrical portion 71. Claw portions 73a protruding radially outward of the cylindrical portion 71 are provided on the first guide surface 73. In the example of Figure 3 , three claw portions 73a are provided at intervals in the circumferential direction of the cylindrical portion 71. The claw portions 73a are mounted on the sealing plate 80 by press-fitting, for example.

[0048] However, the claw portion 73a can also be mounted on the bearing housing 20 via a component other than the seal plate 80. The claw portion 73a can also be directly mounted on the bearing housing 20. The portion of the oil guide 70 other than the claw portion 73a can also be mounted on the seal plate 80, a component other than the seal plate 80 mounted on the bearing housing 20, or the bearing housing 20. In this case, the claw portion 73a can be omitted from the structure of the bearing housing 20. Additionally, the oil guide 70 can also be integrally formed with the bearing housing 20.

[0049] The inclined surface 74 is provided on one end side of the cylindrical portion 71 (specifically, the lower part of the left end portion). The inclined surface 74 inclines towards the Figure 2 left side in (i.e., the side opposite to the first guide surface 73 side) as it advances towards the radially outer side of the cylindrical portion 71.

[0050] As Figure 2 shown by the arrow F1 in, a part of the lubricating oil scattered from the thrust bearing surface 42 of the bearing 30 is guided along the outer surface of the cylindrical portion 71 to the first guide surface 73. The lubricating oil guided to the first guide surface 73 is as Figure 3 and Figure 4 shown by the arrow F4 in, and is guided circumferentially along the first guide surface 73. The flow of the lubricating oil along the first guide surface 73 (i.e., the flow represented by the arrow F4) is referred to as the internal flow. The direction of the internal flow shown by the arrow F4 is consistent with the rotation direction of the shaft 6. That is, the arrow F4 represents the internal flow when the shaft 6 rotates clockwise in Figure 3 .

[0051] As Figure 2 shown by the arrow F2 in, a part of the lubricating oil scattered from the thrust bearing surface 42 of the bearing 30 is conveyed downward along the inclined surface 74. The lubricating oil conveyed downward along the inclined surface 74 is guided to the discharge port 22 at the lower part of the bearing housing 20 (refer to Figure 1 ).

[0052] Here, as Figure 2 shown by the arrow F3 in, a part of the lubricating oil scattered from the thrust bearing surface 42 of the bearing 30 is discharged towards the compressor impeller 8 through the gap between the oil baffle member 60 and the cylindrical portion 71. The lubricating oil that has passed through the gap between the oil baffle member 60 and the cylindrical portion 71 scatters radially outward as the oil baffle member 60 rotates. The flow of the lubricating oil that scatters radially after passing through the gap between the oil baffle member 60 and the cylindrical portion 71 (i.e., the flow represented by the arrow F3) is referred to as the external flow.

[0053] In Figure 3 and Figure 4 , the internal flow represented by the arrow F4 and in Figure 2The outflow indicated by arrow F3 in the figure merges near the lower part of the oil guide 70 and may interfere with each other. The interference between the inflow and the outflow reduces the oil dischargeability of the lubricating oil and is a major cause of deterioration of the oil seal performance. In the oil guide 70 of this embodiment, the interference between the inflow and the outflow can be suppressed by providing the second guide surfaces 75 and 76.

[0054] like Figure 3 and Figure 4 As shown, the second guide surfaces 75 and 76 are located radially outside the cylindrical portion 71. The second guide surfaces 75 and 76 extend in a direction intersecting the outer peripheral surface 71a of the cylindrical portion 71 and the first guide surface 73. The second guide surfaces 75 and 76 are connected to the outer peripheral surface 71a of the cylindrical portion 71 and the first guide surface 73.

[0055] The second guide surfaces 75 and 76 are formed between the first guide surface 73 and the inclined surface 74. That is, the first guide surface 73 and the inclined surface 74 are connected to each other via the second guide surfaces 75 and 76. The second guide surface 75 is formed between the first guide surface 73 and the inclined surface 74. Figure 3 The second guide surface 76 is formed between the first guide surface 73 and the inclined surface 74. Figure 3 Thus, the two second guide surfaces 75 and 76 are respectively arranged at different positions in the circumferential direction of the cylindrical portion 71. In addition, the two second guide surfaces 75 and 76 are arranged at Figure 3 The position of the left-right symmetry (i.e., the position of the symmetry with respect to the vertical axis) in the middle, but it can also be arranged at Figure 3 In addition, one of the two second guide surfaces 75 and 76 may be omitted from the structure of the oil guide 70. That is, the number of the second guide surface may be one.

[0056] In the present embodiment, the second guide surfaces 75 and 76 extend approximately parallel to the axial direction of the cylindrical portion 71 and approximately parallel to the radial direction of the cylindrical portion 71. However, the second guide surfaces 75 and 76 are slightly inclined relative to the axial direction of the cylindrical portion 71. The second guide surfaces 75 and 76 are slightly inclined in such a manner that the bearing 30 side is lower than the first guide surface 73 side. The second guide surfaces 75 and 76 are inclined in such a manner that the radial outer side is lower than the radial inner side. The second guide surfaces 75 and 76 are located below the center position of the shaft 6. However, the second guide surfaces 75 and 76 may also be located above the center position of the shaft 6, but from the viewpoint of suppressing interference between the internal flow and the external flow, it is preferably located below the center position of the shaft 6. The second guide surfaces 75 and 76 are located above the inclined surface 74.

[0057] As described above, the internal flow indicated by the arrow F4 is the flow of lubricating oil along the first guide surface 73. Here, the second guide surfaces 75 and 76 are located on the path of the internal flow and extend in a direction intersecting the flow direction of the internal flow. Therefore, the lubricating oil transported by the internal flow collides with either the second guide surface 75 or the second guide surface 76. Moreover, the flow direction of the lubricating oil changes. In Figure 3 and Figure 4 example, the lubricating oil transported by the internal flow indicated by the arrow F4 collides with the second guide surface 76. In addition, when the shaft 6 rotates counterclockwise in Figure 3 , since the flow direction of the internal flow is opposite to the direction of the arrow F4, the lubricating oil transported by the internal flow collides with the second guide surface 75.

[0058] As Figure 3 and Figure 4 shown by the arrow F5, the lubricating oil that collides with the second guide surface 76 is guided by the second guide surface 76 to the radially outer side of the cylindrical portion 71 and scattered. Thereby, it is possible to suppress the lubricating oil from being transported along the direction of the internal flow to the vicinity of the lower part of the oil guide 70. Therefore, it is possible to suppress the internal flow and the external flow from merging and interfering with each other in the vicinity of the lower part of the oil guide 70. Therefore, the oil drainage property of the lubricating oil is improved, and further the oil seal performance is improved.

[0059] As Figure 3 and Figure 4 shown by the arrow F6, a part of the lubricating oil that collides with the second guide surface 76 is also guided by the second guide surface 76 to the bearing 30 side in the axial direction of the cylindrical portion 71 and scattered. The lubricating oil scattered in the axial direction of the cylindrical portion 71 by the second guide surface 76 is transported downward along the inclined surface 74. Thereby, the oil drainage property is further improved. In particular, in the oil guide 70, the first guide surface 73 and the inclined surface 74 are connected to each other via the second guide surface 76. Therefore, the lubricating oil scattered in the axial direction of the cylindrical portion 71 by the second guide surface 76 is easily guided to the inclined surface 74.

[0060] In the oil guide 70, the two second guide surfaces 75 and 76 are respectively provided at different positions in the circumferential direction of the cylindrical portion 71. Thereby, regardless of the rotation direction of the shaft 6, the lubricating oil transported by the internal flow collides with either the second guide surface 75 or the second guide surface 76. Therefore, regardless of the rotation direction of the shaft 6, it is possible to suppress the internal flow and the external flow from merging and interfering with each other in the vicinity of the lower part of the oil guide 70.

[0061] In the above, an example in which the second guide surfaces 75 and 76 extend substantially parallel to the axial direction of the cylindrical portion 71 and substantially parallel to the radial direction of the cylindrical portion 71 has been described. However, the extending direction of the second guide surfaces 75 and 76 is not limited to the above example. Hereinafter, referring to Figure 5 , Figure 6, Figure 7 and Figure 8 A first modified example and a second modified example in which the extending directions of the second guiding surfaces 75 and 76 are different from those in the above example will be described.

[0062] Figure 5 Fig. is a front view of the oil deflector 170 of the first modified example as viewed from the bearing 30 side. Figure 6 Fig. is a perspective view of the oil deflector 170 of the first modified example as viewed from the bearing 30 side. As Figure 5 and Figure 6 shown, the oil deflector 170 has a cylindrical portion 171, a flat portion 172, a first guiding surface 173, an inclined surface 174, and second guiding surfaces 175 and 176. The structures of the cylindrical portion 171, the flat portion 172, the first guiding surface 173, and the inclined surface 174 are the same as those of the cylindrical portion 71, the flat portion 72, the first guiding surface 73, and the inclined surface 74 of the oil deflector 70, and thus the description thereof is omitted. In addition, the oil deflector 170 can be mounted on the sealing plate 80 using the claw portion 173a provided on the first guiding surface 173.

[0063] The second guiding surfaces 175 and 176 are located on the radially outer side of the cylindrical portion 171, similarly to the second guiding surfaces 75 and 76 of the oil deflector 70. Further, the second guiding surfaces 175 and 176 extend in a direction intersecting with the outer peripheral surface 171a of the cylindrical portion 171 and the first guiding surface 173. Further, the second guiding surfaces 175 and 176 are connected to the outer peripheral surface 171a of the cylindrical portion 171 and the first guiding surface 173. Further, the second guiding surfaces 175 and 176 are formed over the region between the first guiding surface 173 and the inclined surface 174.

[0064] Here, in the first modified example, the second guiding surfaces 175 and 176 extend substantially parallel to the radial direction of the cylindrical portion 171, similarly to the second guiding surfaces 75 and 76 of the oil deflector 70. On the other hand, the second guiding surfaces 175 and 176 are different from the second guiding surfaces 75 and 76 of the oil deflector 70, and are inclined more greatly with respect to the axial direction of the cylindrical portion 171. The second guiding surfaces 175 and 176 are inclined more greatly such that the bearing 30 side is lower than the first guiding surface 173 side. The second guiding surfaces 175 and 176 are inclined such that the radially outer side is lower than the radially inner side. The second guiding surfaces 175 and 176 are located below the center position of the shaft 6. The vertical positions of the ends on the bearing 30 side of the second guiding surfaces 175 and 176 are substantially the same as the vertical position of the upper end of the inclined surface 174.

[0065] In the oil deflector 170 of the first modified example, similarly to the oil deflector 70, as Figure 5 and Figure 6As shown by arrow F4, an internal flow is formed by the first guiding surface 173. The lubricating oil conveyed through the internal flow collides with the second guiding surface 176. Moreover, as Figure 5 and Figure 6 shown by arrow F5, the lubricating oil colliding with the second guiding surface 176 is guided by the second guiding surface 176 to the radially outer side of the cylindrical portion 171 and scattered. Thereby, the oil drainage property of the lubricating oil is improved.

[0066] As Figure 5 and Figure 6 in the oil guide 170 shown, the second guiding surfaces 175 and 176 may also be inclined greatly with respect to the axial direction of the cylindrical portion 171. However, in the above-described oil guide 70, the second guiding surfaces 75 and 76 extend substantially parallel to the axial direction of the cylindrical portion 71. Thereby, a part of the lubricating oil colliding with the second guiding surfaces 75 and 76 also easily scatters to the bearing 30 side in the axial direction of the cylindrical portion 71 through the second guiding surface 76. Therefore, the oil drainage property is further improved.

[0067] Figure 7 is a front view of the oil guide 270 of the second modification as viewed from the bearing 30 side. Figure 8 is a perspective view of the oil guide 270 of the second modification as viewed from the bearing 30 side. As Figure 7 and Figure 8 shown, the oil guide 270 has a cylindrical portion 271, a flat portion 272, a first guiding surface 273, an inclined surface 274, and second guiding surfaces 275 and 276. The structures of the cylindrical portion 271, the flat portion 272, the first guiding surface 273, and the inclined surface 274 are the same as those of the cylindrical portion 71, the flat portion 72, the first guiding surface 73, and the inclined surface 74 of the oil guide 70, and thus the description thereof is omitted. In addition, the oil guide 270 can be mounted on the sealing plate 80 using the claw portion 273a provided on the first guiding surface 273.

[0068] The second guiding surfaces 275 and 276 are located on the radially outer side of the cylindrical portion 271, similarly to the second guiding surfaces 75 and 76 of the oil guide 70. Further, the second guiding surfaces 275 and 276 extend in a direction intersecting with the outer peripheral surface 271a of the cylindrical portion 271 and the first guiding surface 273. Further, the second guiding surfaces 275 and 276 are connected to the outer peripheral surface 271a of the cylindrical portion 271 and the first guiding surface 273. Further, the second guiding surfaces 275 and 276 are formed over between the first guiding surface 273 and the inclined surface 274.

[0069] Here, in the second modified example, the second guide surfaces 275 and 276 extend substantially parallel to the axial direction of the cylindrical portion 271, similarly to the second guide surfaces 75 and 76 of the oil guide 70. On the other hand, the second guide surfaces 275 and 276 are different from the second guide surfaces 75 and 76 of the oil guide 70 and are inclined relatively largely with respect to the radial direction of the cylindrical portion 271. The second guide surfaces 275 and 276 extend along the vertical direction. The second guide surfaces 275 and 276 extend downward from the outer peripheral surface 271a of the cylindrical portion 271. The second guide surfaces 275 and 276 are inclined such that the bearing 30 side is closer to the central axis CA of the bearing 30 than the first guide surface 73 side. The second guide surfaces 275 and 276 are located below the central position of the shaft 6. The central position in the vertical direction of the second guide surfaces 275 and 276 is located below the upper end portion of the inclined surface 274 and above the lower end portion of the inclined surface 274.

[0070] In the oil guide 270 of the second modified example, similarly to the oil guide 70, as Figure 7 and Figure 8 shown by the arrow F4 in, an internal flow is formed by the first guide surface 273. The lubricating oil conveyed by the internal flow collides with the second guide surface 276. Moreover, as Figure 7 and Figure 8 shown by the arrow F5 in, the lubricating oil that collides with the second guide surface 276 is guided by the second guide surface 276 to the radially outer side of the cylindrical portion 271 and scattered. Thereby, the oil drainage property of the lubricating oil is improved.

[0071] As Figure 7 and Figure 8 in the oil guide 270 shown, the second guide surfaces 275 and 276 may also be inclined relatively largely with respect to the radial direction of the cylindrical portion 271. However, in the above-described oil guide 70, the second guide surfaces 75 and 76 extend substantially parallel to the radial direction of the cylindrical portion 71. Therefore, the scattering direction of the lubricating oil that collides with the second guide surface 76 and is scattered to the radially outer side of the cylindrical portion 71 is more likely to be along the radial direction of the cylindrical portion 71. Thus, the oil drainage property is further improved.

[0072] As described above, the embodiments of the present disclosure have been described with reference to the drawings, but the present disclosure is of course not limited to these embodiments. As long as those skilled in the art can obviously conceive various modification examples or correction examples within the scope described in the claims, these modification examples or correction examples also of course belong to the technical scope of the present disclosure.

[0073] In the above, an example in which the oil guides 70, 170, and 270 are mounted on the supercharger C has been described. However, the device on which the oil guides 70, 170, and 270 are mounted may also be a device other than the supercharger C, as long as the device includes a bearing having a thrust bearing surface.

[0074] In the above, an example in which the second guide surfaces 75 and 76 are connected to the outer peripheral surface 71a of the cylindrical portion 71, the first guide surface 73, and the inclined surface 74 has been described. However, the second guide surfaces 75 and 76 may also be separated from at least one of the outer peripheral surface 71a of the cylindrical portion 71, the first guide surface 73, and the inclined surface 74. Similarly, the second guide surfaces 175 and 176 may also be separated from at least one of the outer peripheral surface 171a of the cylindrical portion 171, the first guide surface 173, and the inclined surface 174. Similarly, the second guide surfaces 275 and 276 may also be separated from at least one of the outer peripheral surface 271a of the cylindrical portion 271, the first guide surface 273, and the inclined surface 274.

[0075] Reference Signs

[0076] 70: Oil guide; 71: Cylindrical portion; 71a: Outer peripheral surface; 72: Flat portion; 73: First guide surface; 74: Inclined surface; 75: Second guide surface; 76: Second guide surface; 170: Oil guide; 171: Cylindrical portion; 171a: Outer peripheral surface; 172: Flat portion; 173: First guide surface; 174: Inclined surface; 175: Second guide surface; 176: Second guide surface; 270: Oil guide; 271: Cylindrical portion; 271a: Outer peripheral surface; 272: Flat portion; 273: First guide surface; 274: Inclined surface; 275: Second guide surface; 276: Second guide surface; C: Supercharger.

Claims

1. An oil guide, characterized in that, Comprising: A cylindrical portion; A first guiding surface that extends radially outward from the cylindrical portion; and A second guiding surface that is located radially outside the cylindrical portion and extends in a direction intersecting the outer peripheral surface of the cylindrical portion and the first guiding surface, An inclined surface is provided on one end side of the cylindrical portion, and this inclined surface inclines toward the side opposite to the first guiding surface side as it advances radially outward, The first guiding surface and the inclined surface are not directly connected but are connected to each other via the second guiding surface.

2. The oil guide according to claim 1, wherein The second guiding surface extends substantially parallel to the axial direction of the cylindrical portion.

3. The oil guide according to claim 1 or 2, wherein The second guiding surface extends substantially parallel to the radial direction of the cylindrical portion.

4. The oil guide according to claim 1, wherein The second guiding surface inclines with respect to at least one of the axial direction and the radial direction of the cylindrical portion.

5. The oil guide according to claim 1 or 2, wherein The two second guiding surfaces are respectively provided at different positions in the circumferential direction of the cylindrical portion.

6. A supercharger, wherein It comprises the oil guide according to any one of claims 1 to 5.

Images