JP7004175B2 - Electric supercharger - Google Patents

Description

The present invention relates to an electric supercharger.

For example, as described in Patent Document 1, the housing of the electric supercharger is provided with an oil supply port and an oil passage communicating with the oil supply port. Further, the housing is provided with an introduction passage for guiding the lubricating oil supplied to the oil passage to the bearing and the coil end of the electric motor. The lubricating oil supplied from the oil supply port to the oil passage is guided to the bearing and the coil end by the introduction passage, and the bearing and the coil end are lubricated to be cooled.

U.S. Patent Application Publication No. 2014/0056726

However, if the oil passage or the introduction passage is clogged with foreign matter, the supply of lubricating oil to the bearing or the coil end is reduced, resulting in insufficient cooling of the bearing or the coil end.
An object of the present invention is to provide an electric supercharger capable of suppressing insufficient cooling due to clogging of foreign matter.

The electric supercharger for solving the above problems includes a housing, a rotating shaft rotatably supported by the housing via a bearing, and an impeller connected to one end side of the rotating shaft in the axial direction. An electric supercharger comprising an electric motor housed in the housing and rotating the rotating shaft, wherein the electric motor has coil ends protruding from both end faces of the stator core located in the axial direction of the rotating shaft. A detachable oil supply member is provided on the upper portion of the housing located above the electric motor and the bearing in the vertical direction, and the oil supply member is a mounting portion to the housing and is a lubricating oil. An oil distribution member on which a distribution flow path is formed, an oil supply pipe extending from the oil distribution member to a position facing the bearing, and communicating with the distribution flow path to supply lubricating oil to the bearing, and the distribution. It is provided with an oil supply path that communicates with the flow path and opens at a position overlapping the coil end in the radial direction of the rotating shaft, and the housing is formed with a through hole that penetrates the housing in the thickness direction. The gist is that the oil supply pipe is inserted through the through hole and the lubricating oil supplied from the opening of the oil supply path passes through the through hole and is supplied to the coil end. And.

According to this, when the oil supply member is attached to the upper part of the housing, the oil supply pipe is inserted through the through hole of the housing and extends to a position facing the bearing. Further, the lubricating oil in the distribution flow path is supplied to the coil end from the opening of the oil supply path through the through hole of the housing. Therefore, even if the oil supply member can be attached to and detached from the housing by providing a through hole in the housing, the lubricating oil of the oil supply member can be supplied to the bearing and the coil end, and the bearing and the coil end are supplied with the lubricating oil. Can be cooled.

Since the oil supply member is removable from the housing, even if the distribution flow path, oil supply path, or oil supply pipe of the oil distribution member is clogged with foreign matter, the oil supply member can be removed from the housing to remove the foreign matter. By removing the oil or replacing it with a new oil supply member, it is possible to prevent insufficient cooling of the bearing and coil end due to clogging of foreign matter.

Further, regarding the electric supercharger, the housing is provided as the through hole at a position overlapping the first through hole through which the oil supply pipe is inserted and the coil end in the radial direction of the rotation shaft, and the oil is provided. It may have a second through hole through which the lubricating oil supplied from the opening of the supply path passes.

According to this, the oil supply pipe can be guided to the position facing the bearing by inserting the oil supply pipe through the first through hole. Further, since the lubricating oil supplied from the opening of the oil supply path passes through the second through hole and is supplied to the coil end, the coil end is cooled by the lubricating oil.

Further, regarding the electric supercharger, the oil supply pipe is provided with a ejection hole facing the bearing and a supply flow path for communicating the distribution channel and the ejection hole, and the hole diameter of the ejection hole is 0.5 to. It is 1.5 mm, and the flow path cross-sectional area of the ejection hole may be smaller than the flow path cross-sectional area of the supply flow path.

According to this, the lubricating oil introduced into the supply flow path of the oil supply pipe can be vigorously ejected to the bearing by the ejection hole, and the bearing can be satisfactorily lubricated.
Further, in the electric supercharger, the oil supply member is attached to the housing by fitting the oil distribution member into the fitting recess recessed from the outer surface of the housing, and the oil supply member is the oil distribution member. It may have an endless annular sealing member that surrounds the member.

According to this, one sealing member can collectively seal between the oil distribution member and the fitting recess. Therefore, even if the oil distribution member has a plurality of locations where lubricating oil flows, such as an oil supply pipe and an oil supply path, one seal member suppresses the leakage of lubricating oil from between the oil supply member and the fitting recess. can.

According to the present invention, insufficient cooling due to clogging of foreign matter can be suppressed.

Sectional drawing which shows the electric supercharger of embodiment. A partial plan view showing a state in which the oil supply member is removed. The perspective view which shows the oil supply member and the seal member. A partial cross-sectional view showing a state in which the oil supply member is removed. A partial plan view showing a state in which an oil supply member is attached. A partial cross-sectional view showing another example of an electric supercharger.

Hereinafter, an embodiment embodying the electric supercharger will be described with reference to FIGS. 1 to 5. The electric supercharger of the present embodiment is mounted in the engine room of an automobile and is used to compress and supply air as a fluid to the engine.

As shown in FIG. 1, the housing 11 of the electric supercharger 10 includes a cylindrical motor housing 12. Further, the housing 11 includes a disk-shaped first plate 13 connected to one end surface in the axial direction of the motor housing 12, and a disk-shaped second plate 14 connected to the other end surface in the axial direction of the motor housing 12. A cover 14a attached to the second plate 14 is provided. The housing 11 includes a compressor housing 15 connected to the side of the first plate 13 opposite to the motor housing 12. The motor housing 12, the first plate 13, the second plate 14, the cover 14a, and the compressor housing 15 are made of, for example, aluminum.

The first plate 13 includes a cylindrical first bearing portion 16. The second plate 14 is formed with a through hole 14h for bearings. A cylindrical second bearing case 17 is attached to the bearing through hole 14h. The cover 14a closes the opening on the side opposite to the motor housing 12 in the bearing through hole 14h.

The electric supercharger 10 includes a rotating shaft 20 rotatably supported by the housing 11. The rotating shaft 20 is inserted through the second bearing case 17, the motor housing 12, and the first plate 13. The rotating shaft 20 penetrates the first plate 13 and projects into the compressor housing 15. A shaft seal 13a is interposed between the rotating shaft 20 and the first plate 13.

In the present embodiment, the side of the rotary shaft 20 protruding into the compressor housing 15 corresponds to one end side in the axial direction of the rotary shaft 20, and the second bearing case 17 side of the rotary shaft 20 is the other end of the rotary shaft 20 in the axial direction. Corresponds to the side. An impeller 21 is connected to one end side of the rotating shaft 20 in the axial direction.

An electric motor 22 for rotating the rotating shaft 20 is housed in the motor housing 12. The electric motor 22 is housed in a motor chamber 121 which is a space surrounded by a motor housing 12, a first plate 13, and a second plate 14.

A discharge passage 54 for discharging the lubricating oil in the motor chamber 121 to the outside of the housing 11 is formed on the lower side of the motor housing 12 in the vertical direction. The lubricating oil discharged to the outside of the housing 11 through the discharge passage 54 is collected as engine oil in the oil pan of the engine.

The electric motor 22 includes a cylindrical stator 23 and a rotor 24 arranged inside the stator 23. A coil 25 is wound around the stator 23. The rotor 24 rotates integrally with the rotating shaft 20 by supplying an electric current to the coil 25.

The stator 23 includes a stator core 23a fixed to the inner peripheral surface of the motor housing 12, a first coil end 25e projecting from the end surface of the stator core 23a in the axial direction toward the impeller 21, and a second bearing case 17. It has a second coil end 25f protruding from the end face closer to it. The first coil end 25e and the second coil end 25f are a part of the coil 25.

The electric supercharger 10 includes a first bearing 31 that rotatably supports a portion of the rotary shaft 20 near the impeller 21. The first bearing 31 is housed in the first bearing portion 16. A plurality of first bearings 31 are arranged between the first inner ring 31a fixed to the rotating shaft 20, the first outer ring 31b inserted into the first bearing portion 16, and the first inner ring 31a and the first outer ring 31b. It has a first bearing 31c.

The electric supercharger 10 includes a second bearing 32 that rotatably supports a portion of the rotary shaft 20 that is farther from the impeller 21 than the first bearing 31 in the axial direction of the rotary shaft 20. Therefore, the rotary shaft 20 is rotatably supported by the housing 11 via the first bearing 31 and the second bearing 32. The second bearing 32 is housed in the second bearing case 17 and is arranged at the end of the second bearing case 17 on the opposite side of the cover 14a in the axial direction of the rotating shaft 20.

A plurality of second bearings 32 are arranged between the second inner ring 32a fixed to the rotating shaft 20, the second outer ring 32b inserted into the second bearing case 17, and the second inner ring 32a and the second outer ring 32b. It has a second ball 32c.

In the second bearing case 17, a storage chamber 33 is provided between the second bearing 32 and the cover 14a in the axial direction of the rotating shaft 20. An annular washer 34 and a preload spring 35 are housed in the storage chamber 33. One end of the preload spring 35 is in contact with the cover 14a, and the other end of the preload spring 35 is in contact with the end surface of the second outer ring 32b of the second bearing 32 via the washer 34. The preload spring 35 is arranged between the cover 14a and the washer 34 in a state of being compressed in the axial direction of the rotating shaft 20. Therefore, the cover 14a holds the preload spring 35. Then, the preload spring 35 urges the second bearing 32 in the axial direction of the rotating shaft 20 by a force that tries to return to the original shape of the compressed preload spring 35.

The compressor housing 15 has a suction port 15a into which air (fresh air) is sucked, an impeller chamber 15b communicating with the suction port 15a and accommodating an impeller 21, and a discharge chamber in which air compressed by the impeller 21 is discharged. It has a diffuser flow path 15d that communicates the impeller chamber 15b and the discharge chamber 15c with the 15c.

Then, when the electric motor 22 is driven to rotate the rotation shaft 20, the impeller 21 rotates, and the centrifugal force of the rotating impeller 21 gives velocity energy to the air sucked from the suction port 15a. The air to which the velocity energy is given and becomes high speed is decelerated by the diffuser flow path 15d provided at the outlet of the impeller 21, and the velocity energy of the air is converted into the pressure energy. Then, the high-pressure air is discharged from the discharge chamber 15c and supplied to an engine (not shown).

A fitting recess 12c extending in the axial direction of the rotating shaft 20 is provided on the upper portion of the motor housing 12 in the vertical direction, and an oil supply member 40 described later is attached to the fitting recess 12c.

As shown in FIG. 1 or 2, the fitting recess 12c is partitioned inside a partition wall 18 projecting in an elongated annular shape from the outer surface of the motor housing 12. Further, on the upper portion of the motor housing 12, bosses 19 having the same height as the upper end of the partition wall 18 are provided on each long side side of the partition wall 18.

The bottom surface 12d of the fitting recess 12c has a flat surface shape. Of the inner side surfaces erected from the bottom surface 12d of the fitting recess 12c, one end surface 121c near the impeller 21 is located at a position where it vertically overlaps with the first bearing 31. Further, of the inner surface of the fitting recess 12c, the other end surface 122c near the second bearing case 17 is located at a position where it vertically overlaps with the second bearing 32.

A pair of first through holes 38 for communicating the inside of the fitting recess 12c and the inside of the motor housing 12 are provided in the upper part of the motor housing 12 which is the upper part of the housing 11. The pair of first through holes 38 are through holes that penetrate the motor housing 12 in the thickness direction, respectively. One of the first through holes 38 is arranged closer to one end surface 121c of the fitting recess 12c. One of the first through holes 38 is located at a position vertically overlapping the space in the motor chamber 121 between the first bearing portion 16 and the first coil end 25e in the axial direction of the rotating shaft 20. Have been placed.

The other first through hole 38 is arranged near the other end surface 122c of the fitting recess 12c. The other first through hole 38 is located at a position vertically overlapping the space in the motor chamber 121 between the second bearing case 17 and the second coil end 25f in the axial direction of the rotating shaft 20. Have been placed.

Further, a pair of second through holes 39 for communicating the bottom surface 12d of the fitting recess 12c and the inner peripheral surface of the motor housing 12 are provided in the upper portion of the motor housing 12. The pair of second through holes 39 are through holes that penetrate the motor housing 12 in the thickness direction, respectively. The pair of second through holes 39 are arranged inside the pair of first through holes 38 in the axial direction of the rotating shaft 20 along the axial direction of the rotating shaft 20. The pair of first through holes 38 and the pair of second through holes 39 are arranged in a row in the axial direction of the rotating shaft 20.

One second through hole 39 is arranged closer to one first through hole 38. On the other hand, the second through hole 39 is arranged at a position overlapping the first coil end 25e in the vertical direction and in the radial direction of the rotating shaft 20, and is arranged above the first coil end 25e in the vertical direction. The other second through hole 39 is arranged at a position overlapping the second coil end 25f in the vertical direction and in the radial direction of the rotating shaft 20, and is arranged above the second coil end 25f in the vertical direction. The oil supply member 40 is fitted to the fitting recess 12c having the above configuration in a fitted state. The oil supply member 40 is a member for supplying lubricating oil to the first coil end 25e and the second coil end 25f, and the first bearing 31 and the second bearing 32.

As shown in FIG. 3 or 4, the oil supply member 40 has a rectangular block-shaped oil distribution member 41 and a pair of oil supply pipes 51 integrated with the oil distribution member 41. The oil distribution member 41 has a first end surface 41a on an end surface facing the bottom surface 12d of the fitting recess 12c, and has a second end surface 41b parallel to the first end surface 41a and exposed to the outside of the motor housing 12. .. The first end surface 41a and the second end surface 41b each have an elongated shape, and the oil distribution member 41 has an elongated block shape as a whole.

In the oil distribution member 41, the extending direction of the straight line connecting the first end surface 41a and the second end surface 41b at the shortest distance is defined as the thickness direction. Further, in the electric supercharger 10, the longitudinal direction of the oil distribution member 41 coincides with the axial direction of the rotary shaft 20. The oil distribution member 41 has a first side surface 41c connected to the first end surface 41a, and the first side surface 41c is a surface that intersects the first end surface 41a. Further, the oil distribution member 41 has a second side surface 41d connected to the second end surface 41b, and the second side surface 41d is a surface that intersects the second end surface 41b. The oil distribution member 41 has a stepped surface 41e connected to the first side surface 41c and the second side surface 41d.

The oil supply member 40 includes a seal member 42 made of a rubber ring mounted on the oil distribution member 41. The inner peripheral edge of the seal member 42 is in close contact with the first side surface 41c, and the upper end edge of the oil distribution member 41 is in close contact with the stepped surface 41e. The outer peripheral edge of the seal member 42 slightly protrudes outward from the second side surface 41d of the oil distribution member 41. Of the second side surface 41d of the oil distribution member 41, a pair of long side sides are provided with mounting bosses 48, respectively. Each mounting boss 48 is provided with a through hole 48a.

The oil distribution member 41 is provided with a supply port 43 for supplying lubricating oil to the oil distribution member 41. The supply port 43 protrudes in a cylindrical shape from the second end surface 41b, and the supply port 43 is connected to the lubricating oil supply pump P. Further, the oil distribution member 41 is provided with a distribution flow path 44. The distribution flow path 44 is formed by a drill from one end in the longitudinal direction of the oil distribution member 41, and one end in the longitudinal direction of the oil distribution member 41 is closed by the closing member 45. The distribution flow path 44 is formed by using a mold when the oil distribution member 41 is manufactured by casting. The supply port 43 described above communicates with the distribution flow path 44. The distribution flow path 44 extends almost all over the longitudinal direction of the oil distribution member 41.

Mounting holes 46 are provided in the first end faces 41a on both sides of the oil distribution member 41 in the longitudinal direction, and one end of each mounting hole 46 communicates with the distribution flow path 44 and the other end opens in the first end face 41a. An oil supply pipe 51 is inserted into each mounting hole 46, and each oil supply pipe 51 is integrated with an oil distribution member 41 in a state where the oil supply pipe 51 is inserted into each mounting hole 46. Therefore, the oil supply pipe 51 communicates with the distribution flow path 44. Then, the oil distribution member 41 distributes the lubricating oil to each oil supply pipe 51 by the distribution flow path 44.

The oil supply pipe 51 supplies the lubricating oil distributed by the distribution flow path 44 to the first bearing 31 or the second bearing 32. Each oil supply pipe 51 is tubular. The oil supply pipe 51 is provided with a supply flow path 51a extending in the axial direction inside the oil supply pipe 51. In the supply flow path 51a, one end in the axial direction near the oil distribution member 41 opens in the mounting hole 46, and the other end in the axial direction away from the oil distribution member 41 communicates with the ejection hole 51b. Therefore, the supply flow path 51a is a flow path for supplying the lubricating oil distributed to the oil supply pipe 51 to the ejection hole 51b.

The ejection hole 51b extends in the radial direction of the oil supply pipe 51. One end of the ejection hole 51b communicates with the supply flow path 51a, and the other end of the ejection hole 51b opens to the outer peripheral surface of the oil supply pipe 51 and opens toward the first bearing 31 or the second bearing 32. The flow path cross-sectional area of the ejection hole 51b is smaller than the flow path cross-sectional area of the supply flow path 51a. The hole diameter of the ejection hole 51b is 0.5 to 1.5 mm. The ejection hole 51b is a hole for supplying lubricating oil to the bearings 31 and 32 through the ejection hole 51b.

An oil supply path 47 is provided inside each mounting hole 46 in the longitudinal direction of the oil distribution member 41, and one end of each oil supply path 47 communicates with the distribution flow path 44 and the other end is on the first end surface 41a. Open. Each oil supply path 47 is a hole that penetrates the peripheral wall surrounding the distribution flow path 44 in the oil distribution member 41 in the thickness direction.

As shown in FIG. 1 or 5, in the oil supply member 40 having the above configuration, the first end surface 41a side of the oil distribution member 41 is fitted into the fitting recess 12c. A bolt 49 is inserted into the through hole 48a of each mounting boss 48 of the oil supply member 40, and the bolt 49 is screwed into the boss 19 of the motor housing 12. The oil supply member 40 is fixed to the motor housing 12 by screwing the bolt 49 to the boss 19.

The first end surface 41a is in contact with the bottom surface 12d of the fitting recess 12c. Further, the inner peripheral edge of the seal member 42 is in close contact with the first side surface 41c, and the upper end edge of the seal member 42 is in close contact with the stepped surface 41e. Further, the lower end edge of the seal member 42 is in close contact with the bottom surface 12d of the fitting recess 12c, and the outer peripheral edge of the seal member 42 is in close contact with the inner surface of the fitting recess 12c. Then, the sealing member 42 seals between the fitting recess 12c and the oil distribution member 41.

Of the pair of oil supply pipes 51 of the oil supply member 40, one of the oil supply pipes 51 is inserted into the first through hole 38 of the other. One of the oil supply pipes 51 that has passed through the first through hole 38 is arranged in the space in the motor chamber 121 between the first bearing portion 16 and the first coil end 25e in the axial direction of the rotating shaft 20. The ejection hole 51b faces the first bearing 31 along the axial direction of the rotating shaft 20. Further, the other oil supply pipe 51 is inserted into the other first through hole 38. The other oil supply pipe 51 that has passed through the other first through hole 38 is a space in the motor chamber 121 between the second bearing case 17 and the second coil end 25f in the axial direction of the rotating shaft 20. The ejection hole 51b faces the second bearing 32 along the axial direction of the rotating shaft 20.

The ejection hole 51b of one oil supply pipe 51 faces a part between the first inner ring 31a and the first outer ring 31b in the axial direction of the rotating shaft 20, and the ejection hole 51b of the other oil supply pipe 51 faces. Faces a part between the second inner ring 32a and the second outer ring 32b in the axial direction of the rotating shaft 20.

Of the pair of oil supply paths 47 of the oil supply member 40, one of the oil supply paths 47 is in the vertical direction (in the radial direction of the rotating shaft 20) with respect to the first coil end 25e via the second through hole 39 of the one. It is placed in a position that overlaps with. That is, one of the oil supply passages 47 is open at a position where one end communicates with the distribution flow path 44 and the other end overlaps with the first coil end 25e in the radial direction of the rotating shaft 20. Further, the other oil supply path 47 is arranged at a position overlapping the second coil end 25f via the other second through hole 39 in the vertical direction (diameter direction of the rotating shaft 20). That is, the other oil supply path 47 is open at a position where one end communicates with the distribution flow path 44 and the other end overlaps with the second coil end 25f in the radial direction of the rotating shaft 20.

Next, the operation of this embodiment will be described.
In the electric supercharger 10, lubricating oil is supplied to the distribution flow path 44 from the supply port 43 of the oil supply member 40, and the lubricating oil supplied to the distribution flow path 44 is distributed to both oil supply pipes 51. The lubricating oil in the distribution flow path 44 flows into the supply flow path 51a of the oil supply pipe 51 through one of the mounting holes 46. The lubricating oil that has flowed into the supply flow path 51a is ejected from the ejection hole 51b toward the space between the first inner ring 31a and the first outer ring 31b. At this time, since the flow path cross-sectional area of the ejection hole 51b is smaller than the flow path cross-sectional area of the supply flow path 51a, the lubricating oil is squeezed when passing through the ejection hole 51b, and the first inner ring 31a and the first outer ring are squeezed. It is ejected vigorously toward the area between 31b and 31b.

Similarly, the lubricating oil that has flowed into the supply flow path 51a of the other oil supply pipe 51 is ejected from the ejection hole 51b toward between the second inner ring 32a and the second outer ring 32b. At this time, since the flow path cross-sectional area of the ejection hole 51b is smaller than the flow path cross-sectional area of the supply flow path 51a, the lubricating oil is squeezed when passing through the ejection hole 51b, and the second inner ring 32a and the second outer ring. It is ejected vigorously toward the area between 32b and 32b.

Further, the lubricating oil in the distribution flow path 44 is supplied to the first coil end 25e from the opening of one oil supply passage 47 through the second through hole 39 of one, and is supplied to the first coil end 25e from the opening of the other oil supply passage 47 to the other. It is supplied to the second coil end 25f through the second through hole 39 of the above.

When replacing the oil supply member 40, each bolt 49 is screwed back from the boss 19 and the oil distribution member 41 is removed from the fitting recess 12c. Then, when each oil supply pipe 51 is pulled out from the first through hole 38 and pulled out from the inside of the motor housing 12, the oil supply member 40 can be removed from the motor housing 12.

According to the above embodiment, the following effects can be obtained.
(1) The oil supply member 40 is removable from the motor housing 12. Therefore, for example, when the distribution flow path 44 or the oil supply pipe 51 is clogged with foreign matter, the distribution flow path is removed by replacing the oil supply member 40 or removing the oil supply member 40 from the motor housing 12. It is possible to prevent the 44 and the oil supply pipe 51 from being clogged with foreign matter. Therefore, it is possible to suppress insufficient cooling of the first bearing 31, the second bearing 32, and the coil 25 due to the clogging of the distribution flow path 44 and the oil supply pipe 51 with foreign matter.

(2) Since the oil supply member 40 is separate from the motor housing 12, the oil distribution member 41 can be microfabricated to form the distribution flow path 44, the mounting hole 46, and the oil supply path 47. For example, the distribution flow path 44, the mounting hole 46, and the oil supply path 47 can be easily formed as compared with the case where the motor housing 12 is microfabricated.

(3) The motor housing 12 is provided with a first through hole 38, and an oil supply pipe 51 is inserted through the first through hole 38. The first through hole 38 opens toward the space in the motor chamber 121 between the bearings 31 and 32 and the coil ends 25e and 25f in the axial direction of the rotating shaft 20. Therefore, by inserting the oil supply pipe 51 into the first through hole 38, the oil supply pipe 51 can be guided to a position facing the bearings 31 and 32, respectively.

(4) The motor housing 12 is provided with a second through hole 39, through which the oil supply path 47 of the oil supply member 40 communicates. Then, the lubricating oil supplied from the opening of the oil supply path 47 passes through the second through hole 39 and is supplied to the first coil end 25e or the second coil end 25f. Therefore, the lubricating oil supplied from the oil supply path 47 can be supplied to the first coil end 25e or the second coil end 25f through the second through hole 39, and the respective coil ends 25e and 25f are lubricated to suppress insufficient cooling. can.

(5) The hole diameter of the ejection hole 51b is 0.5 to 1.5 mm, and the flow path cross-sectional area of the ejection hole 51b is smaller than the flow path cross-sectional area of the supply flow path 51a. Therefore, the lubricating oil of the supply flow path 51a can be vigorously ejected to the first bearing 31 and the second bearing 32 by the ejection hole 51b, and the first bearing 31 and the second bearing 32 can be satisfactorily lubricated.

(6) The oil supply member 40 includes an endless annular seal member 42 that surrounds the first side surface 41c of the oil distribution member 41. A single sealing member 42 can collectively seal between the oil distribution member 41 and the fitting recess 12c. Therefore, even if the oil supply member 40 has a plurality of locations where the lubricating oil flows, such as an attachment portion of the oil supply pipe 51 and an oil supply passage 47, one seal member 42 provides the oil distribution member 41 and the fitting recess 12c. It is possible to prevent the lubricating oil from leaking from between. Further, as compared with the case where the sealing members are provided at the attachment points of the pair of oil supply pipes 51 and the positions surrounding the oil supply passage 47 in the oil distribution member 41, the number of parts of the oil supply member 40 can be reduced and the number of parts of the oil supply member 40 can be reduced. The supply member 40 can be easily manufactured.

(7) The oil supply member 40 integrally includes a pair of oil supply pipes 51 and a pair of oil supply passages 47. Then, simply by attaching the oil supply member 40 to the motor housing 12, the supply configuration of the lubricating oil to the first bearing 31 and the second bearing 32 and the supply of the lubricating oil to the first coil end 25e and the second coil end 25f are performed. The composition can be completed. Therefore, when the motor housing 12 is processed to form a lubricating oil supply configuration for the first bearing 31 and the second bearing 32 and a lubricating oil supply configuration for the first coil end 25e and the second coil end 25f. Compared with this, the configuration of the electric supercharger 10 can be simplified.

The above embodiment may be changed as follows.
○ The sealing member 42 may be changed to a liquid gasket or the like as long as it can seal between the fitting recess 12c and the oil distribution member 41.

○ The hole diameter of the ejection hole 51b of the oil supply pipe 51 may be larger than 1.5 mm.
The cross-sectional area of the flow path of the ejection hole 51b of the oil supply pipe 51 may be the same as the cross-sectional area of the flow path of the supply flow path 51a.

The seal member may be provided at a position surrounding each of the pair of oil supply pipes 51 on the first end surface 41a of the oil distribution member 41 and at a position surrounding each of the pair of oil supply paths 47 on the first end surface 41a.

○ The seal member is a position surrounding one oil supply pipe 51 and an oil supply path 47 on the first end surface 41a of the oil distribution member 41 and a position surrounding the other oil supply pipe 51 and the oil supply path 47 on the first end surface 41a. It may be provided in.

○ As shown in FIG. 6, the through holes 52 provided in the motor housing 12 may be provided one by one on both ends in the axial direction of the rotating shaft 20. Then, one oil supply pipe 51 is inserted into the through hole 52 on one end side in the axial direction of the rotary shaft 20, and the lubricating oil supplied from the opening of the one oil supply path 47 is passed through the through hole 52. It may be supplied to the first coil end 25e. Further, the other oil supply pipe 51 is inserted into the through hole 52 on the other end side in the axial direction of the rotary shaft 20, and the lubricating oil supplied from the opening of the other oil supply path 47 is passed through the through hole 52. It may be supplied to the second coil end 25f.

○ The number of through holes provided in the motor housing 12 may be one. Then, a pair of oil supply pipes 51 may be inserted into one through hole to supply lubricating oil to each coil end from the opening of each oil supply path 47.

10 ... Electric supercharger, 11 ... Housing, 12c ... Fitting recess, 20 ... Rotating shaft, 21 ... Impeller, 22 ... Electric motor, 23a ... Stator core, 25e ... First coil end, 25f ... Second coil end, 31 ... 1st bearing, 32 ... 2nd bearing, 38 ... 1st through hole, 39 ... 2nd through hole, 40 ... oil supply member, 41 ... oil distribution member, 42 ... seal member, 44 ... distribution flow path, 47 ... Oil supply path, 51 ... oil supply pipe, 51a ... supply flow path, 51b ... ejection hole, 52 ... through hole.

Claims (4)

With the housing
A rotating shaft rotatably supported by the housing via bearings,
An impeller connected to one end side of the rotating shaft in the axial direction,
An electric motor that is housed in the housing and rotates the rotation shaft is provided.
The electric motor is an electric supercharger having coil ends protruding from both end faces of the stator core located in the axial direction of the rotating shaft.
A detachable oil supply member is provided on the upper part of the housing located above the electric motor and the bearing in the vertical direction.
The oil supply member is an oil distribution member that is an attachment portion to the housing and has a lubricating oil distribution flow path formed therein.
An oil supply pipe that extends from the oil distribution member to a position facing the bearing and communicates with the distribution flow path to supply lubricating oil to the bearing.
It is provided with an oil supply path that communicates with the distribution flow path and opens at a position overlapping the coil end in the radial direction of the rotating shaft.
The housing is formed with a through hole penetrating the housing in the thickness direction, the oil supply pipe is inserted through the through hole, and the lubricating oil supplied from the opening of the oil supply path is provided. An electric supercharger characterized in that it passes through the through hole and is supplied to the coil end. The housing is provided as the through hole at a position overlapping the first through hole through which the oil supply pipe is inserted and the coil end in the radial direction of the rotation shaft, and is supplied from the opening of the oil supply path. The electric supercharger according to claim 1, which has a second through hole through which the lubricating oil passes. The oil supply pipe includes an ejection hole facing the bearing, a supply channel for communicating the distribution flow path and the ejection hole, and the hole diameter of the ejection hole is 0.5 to 1.5 mm, and the ejection hole has a hole diameter of 0.5 to 1.5 mm. The electric supercharger according to claim 1 or 2, wherein the flow path cross-sectional area of the hole is smaller than the flow path cross-sectional area of the supply flow path. By fitting the oil distribution member into the fitting recess recessed from the outer surface of the housing, the oil supply member is attached to the housing, and the oil supply member is an endless annular seal member surrounding the oil distribution member. The electric supercharger according to any one of claims 1 to 3.

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