JP2011202534A - Vacuum pump apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum pump apparatus that allows a scraped-up lubricating oil to reach a sliding element, even when a device for scraping up the lubricating oil is separated from the sliding element such as a bearing.SOLUTION: The vacuum pump apparatus includes a first rotor 26 which is stored in a rotor chamber R inside a housing and rotated when a drive shaft 28 is rotated, a timing gear which is stored in a gear chamber inside the housing and which includes drive gears attached to the drive shaft 28 and driven gears meshed with the drive gears, a second rotor 27 rotated when the driven shaft 29 having the driven gears is rotated, and a scraping-up body which is installed on the drive shaft 28 or the driven shaft 29 and which scrapes up the lubricating oil. The scraping-up body includes, on the drive side bearing 30 side, scraping-up pieces 50 and spattering restraining pieces 51 for restraining the spattering of the lubricating oil scraped up by the scraping pieces 50 radially outward of the scraping-up body.

Description

  The present invention relates to a vacuum pump, and more particularly to a vacuum pump provided with a scooping body that scoops up stored lubricating oil.

As a conventional technique, for example, there is a lubrication structure in a fluid machine disclosed in Patent Document 1.
In the fluid machine disclosed in Patent Document 1, a front housing is joined to the front end of the rotor housing, and a rear housing is joined to the rear end of the rotor housing. A pump chamber is formed in the rotor housing.
A pair of rotating shafts are rotatably supported by the front housing and the rear housing via radial bearings. Both rotating shafts are arranged parallel to each other.
A plurality of rotors are integrally formed on the rotating shaft, and the rotors are accommodated in the pump chamber in a state of being engaged with each other.

A gear housing is assembled to the rear housing.
The pair of rotating shafts penetrates the rear housing and protrudes into a gear housing chamber in the gear housing, and gears are fixedly attached to projecting end portions of the respective rotating shafts.
An electric motor is assembled in the gear housing, and the driving force of the electric motor is transmitted to one rotating shaft via a shaft joint.
The other rotating shaft obtains a driving force from the electric motor via one rotating shaft and a gear, and the other rotating shaft rotates in the opposite direction to the one rotating shaft. The pair of rotating shafts are rotated in synchronization by a gear mechanism including gears.

Lubricating oil is stored in a gear housing chamber that houses a gear mechanism including gears, and a lower portion of the gear is immersed therein.
A plurality of oil scooping grooves or oil scooping projections are formed on the end face of one gear.
The lubricating oil stored in the gear housing chamber is positively scraped by the oil scraping groove or the oil scraping convex portion along with the rotation of the gear, and the scraped lubricating oil is used for lubricating the gear and the radial bearing. Is done.

Moreover, as another prior art, the sealing mechanism of the vacuum pump lubricating oil disclosed by patent document 2 can be mentioned, for example.
In this type of vacuum pump, an intermediate casing is disposed between the bearing casing and the vacuum exhaust chamber casing. The interior of the bearing casing is a bearing chamber, and the interior of the intermediate casing is an intermediate chamber. The inside of the bearing casing is a vacuum exhaust chamber.
A bearing that supports one end of the rotating shaft is disposed inside the bearing casing, and the bearing is supported by the intermediate casing via a bearing case. An exhaust rotor fixed to the rotating shaft is disposed inside the vacuum exhaust chamber casing.
An oil ring is provided at the end of the rotating shaft in the bearing chamber, and lubricating oil is accommodated in the lower portion of the bearing casing.

Japanese Patent Application Laid-Open No. 2002-115685 Japanese Patent Laid-Open No. 3-89080

However, the fluid machine disclosed in Patent Document 1 and the vacuum pump disclosed in Patent Document 2 cannot positively scatter the lubricated oil in the direction of the rotational axis.
When the means for scooping up the lubricating oil and the sliding element such as the bearing are separated from each other in the direction of the rotation axis, there is a problem that the scrubbed lubricating oil does not reach the sliding element sufficiently.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to scrape even when the means for scraping the lubricating oil and the sliding element such as the bearing are separated. Another object of the present invention is to provide a vacuum pump in which lubricating oil can reach the sliding element.

  In order to solve the above-described problems, the present invention provides a drive shaft that rotates by receiving a driving force of a drive source, a first rotor that is housed in a rotor chamber formed in a housing and rotates together with the drive shaft, A timing gear composed of a drive gear provided in the drive shaft and a driven gear meshing with the drive gear, a driven shaft provided with the driven gear, and a driven shaft provided with the driven gear; A second rotor that rotates together with the driven shaft; a drive-side bearing that is provided between the rotor chamber and the gear chamber and horizontally supports the drive shaft with respect to the housing; and the rotor chamber and the gear chamber. A driven bearing for horizontally supporting the driven shaft with respect to the housing, and at least one of the drive shaft or the driven shaft, and lubricating oil stored in the gear chamber. A vacuum pump provided with a scraping body to be scraped up by the scraper, wherein the scraping body has a scraping piece on the drive side bearing side or the driven side bearing side, and the scraping body on a radially outer side of the scraping piece. And a scattering restricting piece for restricting scattering of the lubricating oil that is raised by the lifting piece to the radially outer side of the scraped body.

According to the present invention, when the vacuum pump is operated, the scraping body is rotated with the rotation of the drive shaft and the driven shaft, and the scraping piece scoops up the lubricating oil.
Centrifugal force acts on the scraped lubricant to cause the lubricant to splash outward in the radial direction of the scraped body, but the splash-regulating piece prevents the lubricant from splashing radially outward of the scraped body. The lubricant that regulates and further controls the scattering of the scraping body to the outside in the radial direction is made to follow the scattering restricting piece and the scraping piece by centrifugal force, and the drive side bearing side or the driven side bearing side in the direction of the rotation axis Scatter.
Since the lubricating oil is scattered to the drive side bearing side or the driven side bearing side in the direction of the rotation axis, even if the drive side bearing and the driven side bearing and the scraping body are separated in the direction of the rotation axis, the drive side bearing And it becomes easy to spread to the driven bearing.

  Further, the present invention provides the vacuum pump as described above, wherein the timing gear is disposed between at least one of the driving side bearing and the driven side bearing and the scraping body, and the scraping piece in the scraping body and The radial position of the scattering restricting piece may be located radially outside the outer peripheral edge of at least one of the drive gear and the driven gear facing the scraping body.

  In this case, the lubricating oil that has been scraped up by the scraping piece and whose scattering to the outside in the radial direction is restricted by the scattering restricting piece easily spreads over the timing gear to the driving side bearing and the driven side bearing.

  Further, in the vacuum pump according to the present invention, the scattering restricting piece includes a front edge facing the front side in the rotation direction, and the front edge extends from the front side in the rotation direction to the rear side with respect to the rotation axis. It may be inclined.

  In this case, when the scraping body rotates, the scraping piece and the scattering restricting piece come into contact with the stored lubricating oil, but the leading edge of the scattering restricting piece is inclined, so the leading edge is not inclined. The contact resistance between the scattering restriction piece and the lubricating oil is suppressed as compared with the above. By suppressing this contact resistance, it is possible to reduce the power loss and the load on the scattering restriction piece.

  In the vacuum pump according to the present invention, the scraping piece includes a front base portion on the front side in the rotation direction and a rear end portion on the rear side in the rotation direction, and the scattering restriction piece faces the rear side in the rotation direction. And a position of the trailing edge in the rotational direction is set on the rear side of the rear end portion or the rear end portion in the rotational direction, and provided on the scraping body perpendicular to the rotational axis direction. The distance in the rotation axis direction from the surface to the rear end portion may be set to be equal to or less than the length in the rotation axis direction of the scattering restriction piece.

In this case, the position in the rotational direction of the trailing edge of the scattering restricting piece is set to the rear side in the rotational direction from the rear end or the rear end, and the rear end of the scraping piece from the reference surface of the scraping body The distance in the rotational axis direction to the portion is set to be equal to or less than the length of the scattering restricting piece in the rotational axis direction. For this reason, it is difficult for the lubricating oil thus scooped up to fly over the scattering restricting piece and to the outside in the radial direction of the scraped body.
As a result, it is possible to easily scatter more of the scraped lubricating oil to the drive side bearing side or the driven side bearing side in the direction of the rotation axis.

  In the vacuum pump according to the present invention, the scraping piece includes a front base portion on the front side in the rotation direction and a rear end portion on the rear side in the rotation direction, and the scattering restriction piece faces the rear side in the rotation direction. A distance in the direction of the rotation axis from the reference surface to the rear end is set to be equal to or less than a length in the direction of the rotation axis of the scattering restriction piece, and the position of the rear edge is You may set to the rotation direction back side rather than an edge part.

In this case, the distance in the rotation axis direction from the reference surface to the rear end is set to be equal to or less than the length in the rotation axis direction of the scattering restriction piece, and the trailing edge of the scattering restriction piece is a scraping piece. It is set on the rear side in the rotational direction with respect to the rear end of the. For this reason, even if the scraped lubricating oil moves to the rear side in the rotational direction of the rear end portion of the scraped piece, a part of the scattering restriction piece exists on the radially outer side of the lubricating oil immediately after the movement. .
As a result, the movement of the lubricating oil immediately after the movement to the radially outer side of the scraped body is restricted by the scattering restricting piece, and more of the scraped lubricating oil is driven side bearing side or driven side in the rotation axis direction. It can be made easy to scatter to the bearing side.

  In the vacuum pump according to the present invention, the scattering restricting piece may have a restricting surface facing a center side of the scraping body, and the restricting surface may be perpendicular to the reference surface. .

  In this case, the scraped lubricating oil moves along the regulating surface under the action of centrifugal force. The regulating surface that is perpendicular to the reference surface and faces the center side of the scraped body is parallel to the rotational axis direction, and the moving lubricant is driven side bearing side or driven side bearing side in the rotational axis direction. Can be more scattered.

  The present invention provides a vacuum pump in which the scraped-up lubricating oil can reach the sliding element even when the means for scraping the lubricating oil is separated from the sliding element such as a bearing. be able to.

It is a plane sectional view of the vacuum pump concerning a 1st embodiment of the present invention. It is an arrow line view of the AA line of FIG. It is a longitudinal cross-sectional view which shows the front gear chamber of a vacuum pump. It is a disassembled perspective view which shows the structure in the front gear chamber of a vacuum pump. It is a perspective view of an oil splasher. It is a principal part enlarged view of an oil splasher. It is a figure explaining the effect | action of an oil splasher, (a) is a principal part front view of a scattering control piece when scooping up lubricating oil, (b) is a BB arrow directional view in (a). is there. (A), (b) is the principal part side surface of the oil splasher of the vacuum pump which concerns on another embodiment.

(First embodiment)
Hereinafter, the vacuum pump according to the first embodiment will be described with reference to the drawings.
As shown in FIG. 1, the Roots-type vacuum pump 10 includes a housing serving as an outer shell.
The housing of the vacuum pump 10 includes a rotor housing 11, a front housing 12 joined to the front end of the rotor housing 11, a front gear housing 13 joined to the front end of the front housing 12, and a rear end of the rotor housing 11. The rear housing 14 is joined to the rear housing 14 and the rear gear housing 15 is joined to the rear end portion of the rear housing 14.
A first rotor 26 and a second rotor 27 that mesh with each other are accommodated in a space portion that forms the rotor chamber R in the rotor housing 11.
As shown in FIG. 2, a suction port 16 that sucks fluid into the housing is formed in the upper portion of the rotor housing 11, and a discharge port 17 that discharges fluid in the housing to the outside is formed in the lower portion of the rotor housing 11. Has been.

As shown in FIG. 1, the front housing 12 includes a pair of left and right shaft holes 18, 19, a drive side cylinder portion 20 that is coaxial with the shaft hole 18, and a driven side cylinder portion 21 that is coaxial with the shaft hole 19. Is formed. A space is formed around the drive side cylinder part 20 and the driven side cylinder part 21.
As shown in FIG. 1, the rear housing 14 is formed with a pair of left and right shaft holes 22, 23, a drive side cylinder portion 24 that is coaxial with the shaft hole 22, and a driven side cylinder portion 25 that is coaxial with the shaft hole 23. Has been. A space is formed around the driving side cylinder part 24 and the driven side cylinder part 25.

The drive shaft 28 passes through the first rotor 26 and is fixed to the first rotor 26.
The driven shaft 29 passes through the second rotor 27 and is fixed to the second rotor 27.
The drive shaft 28 and the driven shaft 29 are arranged so that the rotation axis P1 of the first rotor 26 and the rotation axis P2 of the second rotor 27 are parallel to each other.
A front portion of the drive shaft 28 is inserted into the shaft hole 18 of the front housing 12 and supported by the front housing 12 via a drive side bearing 30 and a bearing holder 31.
A rear portion of the drive shaft 28 is inserted into the shaft hole 22 of the rear housing 14 and supported by the rear housing 14 via a drive side bearing 32 and a bearing holder 33.

The front portion of the driven shaft 29 is inserted into the shaft hole 19 of the front housing 12 and is horizontally supported by the front housing 12 via a driven side bearing 34 and a bearing holder 35.
The rear portion of the driven shaft 29 is inserted into the shaft hole 23 of the rear housing 14 and is horizontally supported by the rear housing 14 via a driven side bearing 36 and a bearing holder 37.
That is, the first rotor 26 is horizontally supported by the housing in a dual-supported manner by the drive shaft 28 protruding from both ends. The second rotor 27 is pivotally supported horizontally on the housing by a driven shaft 29 projecting from both ends so as to be supported.

A front gear housing 13 is joined to the front end portion of the front housing 12, and the front gear housing 13 forms a front gear chamber 38 as a gear chamber together with the front housing 12.
A front portion of the drive shaft 28 passes through the front housing 12, and a front drive gear 39 is fixed to the drive shaft 28 in the front gear housing 13.
A front portion of the driven shaft 29 passes through the front housing 12, and a front driven gear 40 is fixed to the driven shaft 29 in the front gear housing 13.
The front drive gear 39 and the front driven gear 40 constitute a timing gear on the front gear chamber 38 side of the vacuum pump 10.
Due to the meshing of the front drive gear 39 and the front driven gear 40, the rotation of the drive shaft 28 is transmitted to the driven shaft 29 via the front drive gear 39 and the front driven gear 40, and the first rotor 26 and the second rotor 27 are relative to each other. It is rotated.

A rear gear housing 15 is joined to the rear end portion of the rear housing 14, and the rear gear housing 15 forms a rear gear chamber 41 as a gear chamber together with the rear housing 14.
A rear portion of the drive shaft 28 passes through the rear housing 14, and a rear drive gear 42 is fixed to the drive shaft 28 in the rear gear housing 15.
A rear portion of the driven shaft 29 passes through the rear housing 14, and a rear driven gear 43 is fixed to the driven shaft 29 in the rear gear housing 15.
An electric motor 44 as a drive source is disposed behind the rear gear housing 15, and an output shaft 45 of the electric motor 44 is connected to the rear end of the drive shaft 28 via a shaft coupling 46.
The rear drive gear 42 and the rear driven gear 43 constitute a timing gear on the rear gear chamber 41 side of the vacuum pump 10.
The drive shaft 28 rotates in response to the driving force of the electric motor 44, and the rotation of the drive shaft 28 is driven via the rear drive gear 42 and the rear driven gear 43 due to the engagement of the rear drive gear 42 and the rear driven gear 43. 29, the first rotor 26 and the second rotor 27 are relatively rotated.
The timing gear of the rear gear chamber 41 functions to transmit most of the rotational force of the drive shaft 28 to the driven shaft 29, and the timing gear of the front gear chamber 38 transmits the rotational force of the drive shaft 28 to the driven shaft 29. The main purpose is to suppress twisting of the drive shaft 28 or the driven shaft 29 that tends to occur during high-load operation of the vacuum pump 10.

Next, the first rotor 26 and the second rotor 27 will be described.
As shown in FIG. 2, the first rotor 26 and the second rotor 27 are formed in a bowl shape when viewed from the directions of the rotation axes P1 and P2.
Two bulging portions 26B that bulge in the radial direction of the first rotor 26 are formed in opposite directions, and two depressed portions 26C that are depressed in the radial direction are formed in opposite directions.
The bulging portion 26B and the depressed portion 26C are arranged at equal intervals in the circumferential direction.
The second rotor 27 is also formed with a bulging portion 27B and a depressed portion 27C similar to the first rotor 26.
As each of the first rotor 26 and the second rotor 27 rotates, one bulge portion is disposed so as to engage with the other depressed portion.
In FIG. 2, the bulging portion 26 </ b> B of the first rotor 26 is engaged with the depressed portion 27 </ b> C of the second rotor 27.

In the vacuum pump 10 of this embodiment, lubricating oil is stored in the front gear chamber 38 and the rear gear chamber 41.
Sliding elements such as the timing gear and the bearings 30, 32, 34, and 36 are lubricated by the supply of lubricating oil, but the front gear chamber 38 and the rear gear chamber 41 scrape up the accumulated lubricating oil. An oil splasher 47 as a body is accommodated.
Since the oil splashers 47 provided in the front gear chamber 38 and the rear gear chamber 41 have the same structure, the oil splasher 47 in the front gear chamber 38 will be described, and the description of the structure of the oil splasher 47 in the rear gear chamber 41 will be omitted. .

As shown in FIGS. 1, 3, and 4, the oil splasher 47 accommodated in the front gear chamber 38 is fixed to the front end portion of the drive shaft 28.
The oil splasher 47 is manufactured by punching and bending a metal plate.
As shown in FIG. 5, the oil splasher 47 includes a plate-shaped main body portion 48, a plurality of scraping pieces 50 that scrape up the lubricating oil, and the lubricant splashed up to the radially outward direction of the oil splasher 47. A plurality of scattering restricting pieces 51 for restricting scattering.

As shown in FIG. 5, a through hole 49 is formed at the center of the main body 48. As shown in FIGS. 3 and 4, the oil splasher 47 is fixed to the front end of the drive shaft 28 via a fixing bolt 53 inserted through the through hole 49.
As shown in FIGS. 3 and 5, the plate surface H of the main body 48 is perpendicular to the direction of the rotational axis P <b> 1 of the drive shaft 28, and corresponds to a reference plane perpendicular to the direction of the rotational axis P <b> 1.
The scraping piece 50 is provided on the drive side bearing 30 side with respect to the plate surface H of the main body 48 by bending near the outer peripheral edge of the main body 48.
In this embodiment, eight scraping pieces 50 are arranged in the vicinity of the outer peripheral edge of the main body 48 so as to be equally spaced from each other in the rotation direction of the oil splasher 47.
The radial position of the scraping piece 50 and the scattering restricting piece 51 in the oil splasher 47 of the front gear chamber 38 is located radially outside the outer peripheral edge of the front drive gear 39 facing the oil splasher 47. .
Further, since the scraping piece 50 is provided on the timing gear side, it can be said that the scraping piece 50 is provided on the bearing side (drive side bearing 30) in the oil splasher 47.

As shown in FIGS. 5 and 6, the scraping piece 50 has an inclination angle α of 45 degrees with respect to the plate surface H of the main body 48.
Therefore, as shown in FIG. 6, the front base portion 50A of the scraping piece 50 is located on the front side in the rotational direction, and the rear end portion 50B of the scraping piece 50 is located on the rear side in the rotational direction.
The front base portion 50A is located on the side of the plate surface H, which is a reference surface, and the rear end portion 50B is present at a position farther from the plate surface H than the front base portion 50A.
A scraping surface 50C is formed between the front base portion 50A and the rear end portion 50B, and the scraping surface 50C is a plane provided from the front side in the rotational direction to the rear side in the rotational direction.
The inclination angle α of the scooping surface 50C is set so that the scooping direction of the lubricating oil scooped up when the vacuum pump 10 is operated at high speed (for example, the rotor rotational speed is about 7000 rpm) is appropriate. .
That is, in the scraping piece 50, the inclination angle α of the scraping surface 50C is set so as to realize an appropriate scraping direction of the lubricating oil according to a specific operation state of the vacuum pump 10.
The appropriate direction of scraping of the lubricating oil here means the direction of scraping of the lubricating oil that is easily fed to the driving side bearing 30 and the driven side bearing 34 by the lubricating oil scraped up by the oil splasher 47. ing.

On the radially outer side of the scraping piece 50, a plate-like scattering restriction piece 51 is formed along the rotational direction by bending.
The scattering restricting piece 51 formed on the radially outer side of the scraping piece 50 suppresses scattering of the oil splasher 47 to the radially outer side due to the centrifugal force of the lubricating oil scraped up by the scraping piece 50.
As shown in FIG. 6, the scattering restricting piece 51 has a front edge 51A facing the front side in the rotational direction, and the front edge 51A is inclined with respect to the rotational axis P1 from the front side in the rotational direction to the rear side. .
Since the front edge 51A of the scattering restricting piece 51 is inclined with respect to the rotation axis P1 from the front side to the rear side in the rotation direction, the oil splasher 47 rotates, and the scattering restricting piece 51 becomes the lubricating oil. The contact resistance between the scattering restricting piece 51 and the lubricating oil when entering is reduced.
In particular, the contact resistance at the time of contact between the scattering restriction piece 51 and the lubricating oil is greatly reduced as compared with the case where the front edge 51A is not inclined toward the rear side in the rotation direction with respect to the rotation axis P1.
An edge 51B of the scattering restricting piece 51 on the side of the rotational axis P1 is parallel to the plate surface H and faces the timing gear side.
The scattering restricting piece 51 includes a rear edge 51C that faces the rear side in the rotation direction, and the rear edge 51C is perpendicular to the plate surface H that is a reference surface.
The scattering restricting piece 51 includes a restricting surface 52 that is perpendicular to the plate surface H of the main body 48 and is formed along the rotational direction and faces the center side of the oil splasher 47.
The restricting surface 52 restricts the scattering of the lubricating oil scooped up by the scraping piece 50 to the radially outer side of the oil splasher 47.
The restricting surface 52 is a surface parallel to the direction of the rotational axis P1 and has a guide function for guiding lubricating oil that receives centrifugal force to the drive-side bearing 30 side of the rotational axis P1.
Further, the regulating surface 52 contributes to the improvement of the lubricating oil scooping capability in cooperation with the scraping piece 50 when the lubricating oil is scraped up.

The positional relationship shown in FIG. 6 exists between the scattering restriction piece 51 and the scraping piece 50.
In this embodiment, the distance X1 in the direction of the rotation axis P1 of the scraping piece 50 (the distance in the direction of the rotation axis P1 from the plate surface H to the rear end 50B) X1 is the distance in the direction of the rotation axis P1 of the scattering restriction piece 51. The length (the length in the direction of the rotational axis P1 from the plate surface H to the edge 51B) is set to be smaller than X2.
Since the distance X1 is set to be smaller than the length X2, the scraping piece 50 that is equal to or less than the length of the scattering restricting piece 51 in the direction of the rotation axis P1 is greater than the edge 51B of the scattering restricting piece 51 on the plate surface H. Located on the side.
For this reason, even if a centrifugal force acts on the lubricating oil picked up by the scraping piece 50, the lubricating oil receiving the centrifugal force gets over the scattering restricting piece 51 and hardly scatters outward in the radial direction of the oil splasher 47. .
The distance X1 only needs to be set to be equal to or shorter than the length of the scattering restricting piece 51 in the direction of the rotation axis P1 (X1 ≦ X2).

In this embodiment, as shown in FIG. 6, the trailing edge 51 </ b> C of the scattering restriction piece 51 is located on the rear side in the rotational direction from the rear end portion 50 </ b> B of the scraping piece 50.
That is, the distance Y in the rotational direction between the trailing edge 51C of the scattering restricting piece 51 and the rear end 50B of the scraping piece 50 is set.
Since the trailing edge 51C of the scattering restricting piece 51 is located on the rear side in the rotational direction from the rear end portion 50B of the scraping piece 50, the scattering restricting piece 51 is located on the rear side in the rotational direction from the rear end portion 50B of the scraping piece 50. Some will exist.
For this reason, even if the lubricating oil scooped up by the scraping piece 50 moves to the rear side in the rotational direction of the rear end portion 50B of the scraping piece 50, the splash-regulating piece is placed on the radially outer side of the lubricating oil immediately after the movement. 51 is present, and the movement of the lubricating oil immediately after the oil splasher 47 moves radially outward is restricted by the scattering restriction piece 51.
The distance Y in the rotational direction between the trailing edge 51C of the scattering restricting piece 51 and the rear end portion 50B of the scraping piece 50 only needs to satisfy Y> 0.
Incidentally, in this embodiment, the positional relationship of the scattering restricting piece 51 is X1 <X2 and Y> 0, but it may be a scattering restricting piece where X1 <X2 and Y = 0.
In the case of X1 <X2 and Y = 0, the scattering restriction piece, even if centrifugal force acts on the lubricating oil scraped up by the scraping piece 50, the lubricating oil that receives the centrifugal force gets over the scattering restriction piece. Although the oil splasher 47 functions to make it difficult to scatter to the outside in the radial direction, the regulation of scattering of the lubricating oil that has moved to the rear side in the rotational direction of the rear end portion 50B of the scraping piece 50 is not restricted.

By the way, in this embodiment, the lubricating oil that has been scraped up by the oil splasher 47 and reaches the vicinity of the driving side cylinder portion 20 and the driven side cylinder portion 21 of the front housing 12 is supplied to the driving side bearing 30 and the driven side bearing 34. Ingenuity to make it easy.
The driving side cylinder portion 20 of the front housing 12 includes a portion corresponding to the upper side of the driving side bearing 30, and the driven side cylinder portion 21 of the front housing 12 includes a portion corresponding to the upper side of the driven side bearing 34.
As shown in FIGS. 3 and 4, a drive-side groove 54 that is inclined with respect to the direction of the rotation axis P <b> 1 is formed on the upper surface of the drive-side cylinder 20.
The drive-side groove portion 54 is a groove having a height difference in the direction of the rotation axis P <b> 1 and is a groove whose height decreases toward the front end of the front housing 12.
A drive-side through hole 55 communicating with the shaft hole 18 is formed near the front end of the drive-side groove 54.
The driving side groove portion 54 corresponds to a part of the lubricating oil guide mechanism and guides the lubricating oil scraped up by the oil splasher 47 and reaching the vicinity of the driving side cylindrical portion 20 to the driving side through hole 55.
The driving side through hole 55 is a hole for supplying the lubricating oil guided by the driving side groove portion 54 to the shaft hole 18 to lubricate the driving side bearing 30.
On the other hand, as shown in FIG. 4, the bearing holder 31 is formed with a communication hole 56 that communicates with the drive side through hole 55. The lubricating oil can reach the driving side bearing 30 through the driving side through hole 55 and the communication hole 56.

Further, as shown in FIG. 4, the driven side cylindrical portion 21 is also formed with a driven side groove portion 57 and a driven side through hole 58 similar to the driving side groove portion 54 and the driving side through hole 55 of the driving side cylindrical portion 20. The bearing holder 35 is also formed with a communication hole 59 that communicates with the driven side through hole 58.
The driven side groove portion 57 corresponds to a part of the lubricating oil guide mechanism and guides the lubricating oil scraped up by the oil splasher 47 and reaching the vicinity of the driven side cylindrical portion 21 to the driven side through hole 58.
Lubricating oil can be supplied to the shaft hole 19 through the driven side groove portion 57 of the driven side cylindrical portion 21, the driven side through hole 58, and the communication hole 59 of the bearing holder 35, so that the driven side bearing 34 can be lubricated.

Further, in this embodiment, the lubricating oil in the vicinity of the driving side cylindrical portion 20 and the driven side cylindrical portion 21 above the driving side bearing 30 and the driven side bearing 34 provided between the rotor chamber R and the front gear chamber 38. Is attached to the front housing 12.
The oil plate 60 constitutes a lubricating oil guide mechanism together with the driving side groove portion 54 and the driven side groove portion 57.
The oil plate 60 collects the lubricating oil above the driving side bearing 30 and the driven side bearing 34 in the front gear chamber 38 and distributes the collected lubricating oil to the driving side through hole 55 and the driven side through hole 58. It corresponds to an oil distribution member.
The oil plate 60 is formed by punching and bending a metal plate.
The oil plate 60 includes a front inclined portion 61 and a rear inclined portion 62 that are inclined in the direction of the rotational axis P1 (P2), and the rear inclined portion 62 has inclined side portions 63 formed on both sides.
The rear inclined portion 62 is inclined so that the lubricating oil flows from the front housing 12 side to the timing gear side in the direction of the rotational axis P1 (P2), and the front inclined portion 61 is timingd by the lubricating oil at the rotational axis P1 (P2). It is inclined to flow from the gear side to the front housing 12 side. The inclined side portions 63 on both sides are inclined so as to make it easier to collect the lubricating oil from both sides near the center.

When the oil plate 60 is attached to the front housing 12, the front inclined portion 61 and the rear inclined portion 62 are inclined forward and backward, and the connecting portion 64 of the front inclined portion 61 and the rear inclined portion 62 is the first. Lower position.
The oil plate 60 has a structure that guides the lubricating oil to the vicinity of the connecting portion 64 of the front inclined portion 61 and the rear inclined portion 62, distributes the oil from the vicinity of the connecting portion 64 to the left and right, and flows downward.
The oil plate 60 is fixed to the front housing 12 so that the driving side through hole 55 is located below one side of the connecting portion 64 and the driving side through hole 55 is located below the other side of the connecting portion 64. ing.

In the same manner as the front housing 12, the rear housing 14 is also scraped up by the oil splasher 47, and the lubricating oil that has reached the vicinity of the drive side cylinder portion 24 and the driven side cylinder portion 25 is driven to the drive side bearing 32 and the driven side bearing 36. It has been devised to make it easy to supply.
A drive side through hole (not shown) and a drive side groove (not shown) constituting a part of the lubricant guide mechanism are formed in the drive side cylindrical portion 24 of the rear housing 14. The bearing holder 33 is formed with a communication hole (not shown) that communicates with the driving side through hole of the driving side cylinder portion 24.
Further, the driven side cylindrical portion 25 is formed with a driven side through hole and a driven side groove portion (not shown) that constitutes a part of the lubricant guide mechanism. The bearing holder 37 is formed with a communication hole (not shown) that communicates with the driven side through hole of the driven side cylinder portion 25.
Furthermore, an oil plate having the same structure as the oil plate 60 is also installed in the rear housing 14. This oil plate, together with the driving side groove of the driving side cylinder 24 and the driven side groove of the driven cylinder 25, constitutes a lubricating oil guide mechanism and corresponds to a lubricating oil distribution member.

Next, the operation of the vacuum pump 10 will be described.
When the drive shaft 28 is rotated by the rotation of the electric motor 44, the rotation of the drive shaft 28 is transmitted to the driven shaft 29 due to the engagement of the timing gears provided in the front gear chamber 38 and the rear gear chamber 41, and the first rotor 26 and the second rotor 26. The rotor 27 is relatively rotated.
When the first rotor 26 and the second rotor 27 are rotated relative to each other, the fluid is introduced from the suction port 16 into the rotor chamber R, and the fluid in the rotor chamber R is discharged from the discharge port 17.

In a state where the vacuum pump 10 is operated, the oil splasher 47 provided in the front gear chamber 38 and the rear gear chamber 41 rotates as the drive shaft 28 and the driven shaft 29 rotate.
The rotation of the oil splasher 47 in the front gear chamber 38 will be described. The lubricating oil stored in the front gear chamber 38 is scraped up by the rotating oil splasher 47.
As shown in FIG. 3, the oil level of the stored lubricating oil L is in a position where it touches the lower end of the front drive gear 39.
The lower end of the outer peripheral edge of the oil splasher 47 is in the lubricating oil L, and the scraping piece 50 and the splash restricting piece 51 of the oil splasher 47 reach the lowest position when the oil splasher 47 is rotated. Soaked in.

As shown in FIG. 7A, the rotation of the oil splasher 47 causes the outer peripheral edge of the rotating oil splasher 47 to form a rotation circle, and the scraping piece 50 is tangent to the rotation circle of the oil splasher 47. The lubricating oil L is scraped up in the direction. In FIG. 7A, the tangential direction of the rotating circle is indicated by an arrow S.
When the vacuum pump 10 is operated at high speed (for example, the rotational speed of the rotor is about 7000 revolutions per minute), the scattering direction of the lubricating oil scooped up by the scraping piece 50 having the inclination angle α of 45 degrees is appropriate.
In FIG. 7A, the scraping piece 50 and the scattering restricting piece 51 in a state immediately before the scraping piece 50 comes out from the liquid surface of the lubricating oil L are indicated by a two-dot chain line.
Further, the scraping piece 50 and the scattering restricting piece 51 in a state after the scraping piece 50 comes out from the liquid surface of the lubricating oil L are indicated by solid lines. FIG.7 (b) is a BB arrow directional view of Fig.7 (a).
In FIG. 7A and FIG. 7B, the lubricating oil L that has been scraped up by the scraping piece 50 and the scattering restricting piece 51 and remains on the scraping piece 50 is schematically shown for convenience of explanation. ing.

Since there is contact resistance between the scraping piece 50 and the scattering restricting piece 51 and the lubricating oil L, the scraping piece 50 scoops up the lubricating oil L when it comes out of the liquid surface of the stored lubricating oil L. The scattering restricting piece 51 cooperates with the scraping piece 50 to improve the ability to scrape the lubricating oil L.
When the oil splasher 47 rotates, the scraping piece 50 and the scattering restricting piece 51 come into contact with the stored lubricating oil L, but the front edge 51A of the scattering restricting piece 51 is inclined, so the front edge is inclined. The contact resistance between the scattering restricting piece 51 and the lubricating oil L is suppressed as compared with the case where it is not. By suppressing this contact resistance, power loss and load on the oil splasher 47 are reduced.

Immediately after the scraping piece 50 comes out of the liquid surface of the lubricating oil L, the lubricating oil L remains on the scraping piece 50 and the scattering restricting piece 51.
Centrifugal force accompanying the rotation of the oil splasher 47 acts on the lubricating oil L remaining on the scraping piece 50 and the scattering restricting piece 51.
The centrifugal force tries to scatter the lubricating oil L remaining on the scraping piece 50 to the outside in the radial direction of the oil splasher 47, but the scattering regulating piece 51 scatters the lubricating oil L to the outside in the radial direction of the oil splasher 47. To regulate.
In particular, as shown in FIGS. 6 and 7B, since the distance X1 is set to be equal to or less than the length X2, the scraped-up lubricating oil L gets over the scattering restriction piece 51 and the oil splasher 47 Difficult to scatter radially outward.

Lubricating oil whose scattering to the outer side in the radial direction of the oil splasher 47 is subjected to centrifugal force, and therefore in the direction of the rotational axis P1 along the regulating surface 52 formed perpendicular to the plate surface H. It moves to the timing gear side (left side of FIG. 7B) and scatters from the end edge 51B and the rear edge 51C of the scatter regulation piece 51.
In addition to centrifugal force, inertial force in the tangential direction in the rotational direction acts on the lubricating oil scattered from the end edge 51B and the rear edge 51C of the scattering restriction piece 51.
Further, the rotation of the oil splasher 47 generates a force component in the direction of the rotational axis P1 in the lubricating oil on the scraping surface 50C. The lubricating oil is combined on the timing gear side in the direction of the rotational axis P1 by the combination of these forces. And it scatters in the tangential direction.
Since the scraped lubricating oil L is scattered toward the timing gear in the direction of the rotation axis P1, the driving side cylinder 20 and the driven side cylinder 21 of the front housing 12 exceed the timing gear in the direction of the rotation axis P1. Lubricating oil spreads around.

Along with the rotation of the oil splasher 47, a part of the lubricating oil L remaining on the scraping piece 50 and the scattering restricting piece 51 moves from the rear end portion 50B of the scraping piece 50 to the rear side in the rotation direction.
In this case, the position in the rotational direction of the trailing edge 51C of the scattering restricting piece 51 is set on the rear side in the rotational direction with respect to the rear end portion 50B of the scraping piece 50. Even if the rear end 50B of the scraping piece 50 moves to the rear side in the rotation direction, a part of the scattering restriction piece 51 exists on the radially outer side of the lubricating oil L immediately after the movement.
For this reason, the movement of the lubricating oil to the radially outer side of the oil splasher 47 is restricted by the scattering restricting piece 51, and more of the scraped lubricating oil L is scattered to the driving side bearing 30 side in the direction of the rotation axis P1. It becomes easy to let.

Of the lubricant oil that has been scraped, the lubricant that does not move toward the rotation axis P <b> 1 collides with the inner wall of the front gear housing 13.
Then, a part of the lubricating oil directed toward the rotational axis P1 and a part of the lubricating oil colliding with the inner wall of the front gear housing 13 cross the timing gear, and the driving side cylinder part 20 and the driven side cylinder part of the front housing 12 Reach around 21.

Of the lubricating oil that has reached the periphery of the driving side cylinder part 20 and the driven side cylinder part 21 of the front housing 12, the lubricating oil guided by the driving side groove part 54 of the driving side cylinder part 20 is communicated with the driving side through hole 55 and the communication. The drive side bearing 30 is reached through the hole 56.
Further, the lubricating oil guided by the driven side groove portion 57 of the driven side cylindrical portion 21 reaches the driven side bearing 34 through the driven side through hole 58 of the driven side cylindrical portion 21 and the communication hole 59 of the bearing holder 35.
The lubricating oil collected by the oil plate 60 is distributed to the driving side through hole 55 of the driving side cylinder part 20 and the driven side through hole 58 of the driven side cylinder part 21.
By the distribution of the lubricating oil by the oil plate 60, the driving side bearing 30 and the driven side bearing 34 that receive the supply of the lubricating oil can always receive the supply of the lubricating oil during operation, and maintain a good lubricating state. Then, the drive side bearing 30 and the driven side bearing 34 are cooled by the lubricating oil.

Also in the rear gear chamber 41, the lubricating oil is scraped up by the oil splasher 47 fixed to the driven shaft 29, and the lubricating oil is scattered to the driven bearing 36 side in the direction of the rotational axis P2.
Further, the drive side groove portion of the drive side cylinder portion 24 of the rear housing 14, the driven side groove portion of the driven side cylinder portion 25, the drive side through hole, the driven side through hole, and the communication holes of the bearing holders 33 and 37, Then, the lubricating oil is supplied to the drive side bearing 32 and the driven side bearing 36.
Further, the lubricating oil collected by an oil plate (not shown) installed in the rear gear chamber 41 is distributed to each through hole.

This embodiment has the following effects.
(1) Since the splash restricting piece 51 is formed on the outer side in the radial direction of the scraping piece 50 in the oil splasher 47 in the front gear chamber 38, the lubricating oil L scraped up by the scraping piece 50 is scattered. 51, the oil splasher 47 is hardly scattered to the outside in the radial direction, and is easily scattered to the drive side bearing 30 side and the driven side bearing 34 side in the direction of the rotation axis P1. Since the lubricating oil L is likely to be scattered to the driving side bearing 30 side and the driven side bearing 34 side in the direction of the rotation axis P1, the lubricating oil is easily collected in the driving side groove portion 54, the driven side groove portion 57 and the oil plate 60. The supply of the lubricating oil to the driving side bearing 30 and the driven side bearing 34 becomes more reliable. Also, the oil splasher 47 in the rear gear chamber 41 has substantially the same effect as the oil splasher 47 in the front gear chamber 38.
(2) When the oil splasher 47 rotates, the scraping piece 50 and the scattering restricting piece 51 come into contact with the stored lubricating oil L, but the front edge 51A of the scattering restricting piece 51 is inclined. The contact resistance with the lubricating oil L is suppressed as compared with the case where is not inclined. By suppressing the contact resistance, the power loss can be reduced and the load on the oil splasher 47 can be reduced.
(3) Since the distance X1 is set to be equal to or less than the length X2, it is difficult for the scraped-up lubricating oil L to get over the scattering restricting piece 51 and to scatter radially outward of the oil splasher 47. As a result, it is possible to easily scatter more of the scraped lubricating oil L to the drive side bearing 30 side in the direction of the rotational axis P1 or the driven side bearing 36 in the direction of the rotational axis P2.
(4) Since the position in the rotational direction of the trailing edge 51C of the scattering restricting piece 51 is set to the rear side in the rotational direction from the rear end portion 50B of the scraping piece 50, the scraped lubricating oil L is Even if the rear end portion 50B of the scraping piece 50 moves to the rear side in the rotational direction, a part of the scattering restriction piece exists on the radially outer side of the lubricating oil L immediately after the movement. For this reason, the movement of the lubricating oil L immediately after the oil splasher 47 moves radially outward is restricted by the scattering restricting piece 51, and more of the scraped up lubricating oil L is transferred to the timing gear side in the direction of the rotation axis P1. Can be easily scattered.
(5) The lubricating oil L that has been scraped is subjected to the action of centrifugal force and moves along a regulating surface 52 formed on a surface perpendicular to the plate surface H. The regulating surface 52 is parallel to the direction of the rotational axis P1, and the moving lubricating oil can be scattered from the drive side bearing 30 side in the direction of the rotational axis P1 or the driven side bearing 36 in the direction of the rotational axis P2.

(6) The timing gear is disposed between the drive-side bearing 30 and the oil splasher 47, and the radial position of the scraping piece 50 and the scattering restricting piece 51 in the oil splasher 47 faces the oil splasher 47. The front drive gear 39 is located radially outside the outer peripheral edge. For this reason, the lubricating oil that has been scraped up by the scraping piece 50 and whose splashing to the outside in the radial direction is regulated by the scattering regulating piece 51 is likely to reach the drive side bearing 30 and the driven side bearing 34 beyond the timing gear.
(7) The lubricating oil moved up above the drive-side bearing 30 and the driven-side bearing 34 in the front housing 12 by scooping up the lubricating oil by the oil splasher 47 is guided by the oil plate 60 to be It reaches the driving side through hole 55 and the driven side through hole 58 of the driven side cylinder portion 21. Lubricating oil is introduced from the driving side through hole 55 to the driving side bearing 30 and is introduced from the driven side through hole 58 to the driven side bearing 34. Lubricating oil that has moved above the driving side bearing 30 and the driven side bearing 34 in the front housing 12 can be supplied to the driving side bearing 30 and the driven side bearing 34. In addition, the oil plate in the rear gear chamber 41 has substantially the same effect as the oil plate 60 in the front gear chamber 38.

(8) Since the radial position of the scraping piece 50 in the oil splasher 47 of the front gear chamber 38 is located radially outside the outer peripheral edge of the front drive gear 39 facing the oil splasher 47, The lubricating oil scraped up by the pieces 50 is scattered around the outer peripheral edge of the front drive gear 39, and the front end face of the front drive gear 39 is difficult to get the lubricant. Therefore, the front drive gear 39 does not excessively receive the lubricating oil scraped up by the oil splasher 47, and can suppress power loss in the timing gear due to excessively exposing the lubricating oil. The oil splasher 47 in the rear gear chamber 41 has substantially the same effect as the oil splasher 47 in the front gear chamber 38.
(9) By the distribution of the lubricating oil by the oil plate 60, the driving side bearing 30 and the driven side bearing 34 that receive the supply of the lubricating oil can always receive the supply of the lubricating oil during operation and maintain a good lubricating state. In addition, the drive side bearing 30 and the driven side bearing 34 can be cooled by lubricating oil.
(10) Since the oil splasher 47 can be manufactured by punching and bending a metal plate, the oil splasher 47 can be easily manufactured and the manufacturing cost can be reduced.

  In this embodiment, the inclination angle α with respect to the plate surface H of the scraping piece 50 in the oil splasher 47 is 45 degrees, but the inclination angle α of the scraping piece 50 is not limited to 45 degrees. For example, the inclination angle α of the scraping piece 50 with respect to the plate surface H may be 60 degrees or 90 degrees depending on the operating conditions of the vacuum pump 10.

(Second Embodiment)
Next, a vacuum pump according to the second embodiment will be described.
In the vacuum pump according to the second embodiment, the configuration of the scattering restriction piece is different from that of the first embodiment.
Moreover, about the element which is common in 1st Embodiment, description of 1st Embodiment is used and a code | symbol is used in common.

Fig.8 (a) has shown the scattering control piece which concerns on 2nd Embodiment.
On the outer peripheral edge side of the scraping piece 50, a plate-like scattering restriction piece 71 is formed by bending.
The scattering restricting piece 71 has a front edge 71A on the front side in the rotational direction, and the front edge 71A does not incline toward the rear in the rotational direction and is perpendicular to the plate surface H.
The end edge 71B on the rotation axis P1 direction side is directed to the drive side bearing 30 side.
The scattering restricting piece 71 includes a rear edge 71C on the rear side in the rotation direction, and the rear edge 71C is not inclined but is perpendicular to the plate surface H.
The scattering restricting piece 71 includes a restricting surface 72 that is formed at a right angle to the plate surface H of the main body 48 and faces the center side of the oil splasher 47.
The restricting surface 72 restricts the scattering of the lubricating oil L scraped up to the radially outer side of the oil splasher 47.
Since the front edge 71A is not inclined, the scattering restricting piece 71 has a rectangular shape.
The regulating surface 72 is a surface parallel to the direction of the rotation axis P1 and has a guide function for guiding the lubricating oil that receives centrifugal force to the timing gear side of the rotation axis P1.
Although the positional relationship shown in FIG. 8A exists between the scattering restriction piece 71 and the scraping piece 50, the position between the scattering restriction piece 51 and the scraping piece 50 in the first embodiment. Same as relationship.

  In this embodiment, the contact resistance at the time of contact between the scattering restricting piece 71 and the lubricating oil increases as compared with the scattering restricting piece 51 of the first embodiment, but the area of the restricting surface 72 is the first embodiment. It increases more than the case of. For this reason, the ability to restrict the scattering of the lubricating oil to the radially outer side of the oil splasher 47 by the restricting surface 72 is improved, and more lubricating oil can be easily scattered to the drive side bearing 30 side in the direction of the rotation axis P1. can do.

(Third embodiment)
Next, a vacuum pump according to a third embodiment will be described.
In the vacuum pump according to the third embodiment, the configuration of the scattering restriction piece is different from that of the first embodiment.
Moreover, about the element which is common in 1st Embodiment, description of 1st Embodiment is used and a code | symbol is used in common.

FIG.8 (b) has shown the scattering control piece which concerns on 3rd Embodiment.
On the outer peripheral edge side of the scraping piece 50, a plate-like scattering restricting piece 81 is formed by bending.
The scattering restricting piece 81 has an arc end 82 from the front side in the rotational direction to the rear side in the rotational direction.
Since the scattering restricting piece 81 has the arc end 82, the scattering restricting piece 81 has a semicircular shape that bulges from the plate surface H toward the timing gear in the direction of the rotation axis P1.
Thereby, in the scattering control piece 81, it is possible to reduce the contact resistance between the scattering control piece 81 and the lubricating oil to the same extent as that of the scattering control piece 51 of the first embodiment.
The arc end 82 has a front edge 82A that is the front side in the rotation direction, an end edge 82B that is most bulged in the direction of the rotation axis P1, and a rear edge 82C that is the rear side in the rotation direction.
However, there is no clear boundary between the front edge 82A, the end edge 82B, and the rear edge 82C.
The scattering restricting piece 81 includes a restricting surface 83 that is formed at a right angle to the plate surface H of the main body 48 and faces the center side of the oil splasher 47.
The restricting surface 83 restricts the scattering of the lubricating oil L to the radially outer side of the oil splasher 47.
The regulating surface 83 is a surface parallel to the direction of the rotational axis P1 and has a guide function for guiding the lubricating oil that receives centrifugal force to the drive-side bearing 30 side of the rotational axis P1.
The positional relationship shown in FIG. 8B exists between the scattering restriction piece 81 and the scraping piece 50.

As shown in FIG. 8B, the distance X1 in the rotation axis P1 direction of the scraping piece 50 (the distance in the rotation axis P1 direction from the plate surface H to the rear end 50B) X1 is the rotation in the scattering restriction piece 81. The length in the direction of the axis P1 (the length in the direction of the rotation axis P1 from the plate surface H to the end edge 82B) X2 is set.
The distance X1 should just be set to the length X2 or less of the scattering restricting piece 81 in the direction of the rotation axis P1 (X1 ≦ X2).
A distance Y in the rotational direction between the trailing edge 82C of the scattering restricting piece 81 and the rear end 50B of the scraping piece 50 is set.
The distance Y in the rotational direction between the trailing edge 82C of the scattering restricting piece 81 and the rear end portion 50B of the scraping piece 50 may satisfy Y> 0.
In this embodiment, the contact resistance between the scattering restricting piece 81 and the lubricating oil L can be expected to be the same as that of the scattering restricting piece 51 of the first embodiment, and the scattering restricting piece 81 has a diameter due to the restricting surface 52. It is possible to regulate the scattering of the lubricating oil to the outside in the direction.

Note that the vacuum pump according to the above-described embodiment shows one embodiment of the present invention, and the present invention is not limited to the above-described embodiment, and is within the scope of the gist of the invention as described below. Various changes can be made.
In the first to third embodiments described above, the number of the scattering restriction pieces and the scraping pieces is eight, but the number of the scattering restriction pieces and the scraping pieces is not limited to this. For example, the scattering restriction pieces The number of scraping pieces may be four or ten.
The shape of the scattering restricting piece is not limited to the shape shown in the first to third embodiments, and the scattering restricting piece restricts the scattering of the lubricating oil radially outward and has a rotational axis. If it has a function of facilitating the scattering of the lubricating oil to the bearing side in the direction, the shape is free. For example, it may be a triangular or parallelogram scattering restriction piece.
In the first embodiment, the front end portion of the scattering restricting piece is linearly inclined forward and backward in the rotational direction, and in the third embodiment, the scattering restricting piece has a circular arc end. Although the contact resistance between the regulating piece and the lubricating oil is reduced, the configuration for reducing the contact resistance is not limited to the linearly inclined front end portion or arc end. For example, the front end portion of the scattering restriction piece may be a front end portion including a free curve or a plurality of straight lines.
In the first to third embodiments described above, one oil splasher as a scraping body is provided on either the drive shaft or the driven shaft in the gear chamber, but the oil splash is provided on the drive shaft and the driven shaft. These may be provided so as not to interfere with each other.
In the above first to third embodiments, the oil splasher as the scraping body is a single member formed by punching and bending a metal plate. The raising piece or the second scraping piece may be detachable as a separate member from the main body of the oil splasher. Further, for example, the scraped body may be formed by bonding or connecting a plurality of metal plates.
○ In the above first to third embodiments, the scattering restriction piece provided in the oil splasher as the scraping body has a flat surface, but the scattering restriction piece may not be a flat surface, for example, Irregularities may exist in the scattering restriction piece, and the scattering restriction piece may include a curved surface or a bent surface. In the above embodiment, the scattering restriction piece is formed so as to be perpendicular to the reference plane. However, the scattering restriction piece is not limited to being perpendicular to the reference plane.
In the above first to third embodiments, the drive side groove and the driven side groove constituting the lubricant guide mechanism are provided in the housing, but the drive side groove and the driven side groove are not provided in the housing. The lubricating oil may be introduced into each through hole using the oil plate of the embodiment or the connecting portion of the second embodiment as a lubricating oil guide mechanism. In this case, processing for forming the groove in the housing is not necessary.
In the above first to third embodiments, a roots type vacuum pump as a vacuum pump has been described. However, the present invention is not limited to a roots type vacuum pump, and may be other types such as a screw type vacuum pump. It is also possible to apply to a vacuum pump.

DESCRIPTION OF SYMBOLS 10 Vacuum pump 11 Rotor housing 12, 72 Front housing 14 Rear housing 26 1st rotor 27 2nd rotor 28 Drive shaft 29 Drive shaft 30, 32 Drive side bearing 34, 36 Drive side bearing 38 Front gear chamber 39 Front drive gear 40 Front Driven gear 41 Rear gear chamber 42 Rear drive gear 43 Rear driven gear 44 Electric motor (as drive source)
47 Oil splasher (as scraper)
48 Main body 50 Scraping piece 50A Front base part 50B Rear end parts 51, 71, 81 Scatter restricting pieces 51A, 71A Front edges 51B, 71B End edges 51C, 71C Rear edges 52, 72, 83 Restricting surface L Lubricating oils P1, P2 Rotation axis R Rotor chamber H Plate surface (as reference surface)

Claims (6)

A drive shaft that rotates in response to the drive force of the drive source;
A first rotor housed in a rotor chamber formed in the housing and rotated together with the drive shaft;
A timing gear that is housed in a gear chamber in the housing and includes a drive gear provided on the drive shaft and a driven gear meshing with the drive gear;
A driven shaft provided with the driven gear;
A second rotor housed in the rotor chamber and rotating with the driven shaft;
A drive-side bearing provided between the rotor chamber and the gear chamber and supporting the drive shaft horizontally with respect to the housing;
A driven-side bearing provided between the rotor chamber and the gear chamber and supporting the driven shaft horizontally with respect to the housing;
A vacuum pump provided on at least one of the drive shaft and the driven shaft, and a scooping body that scoops up the lubricating oil stored in the gear chamber by rotation;
The scraping body is a scraping piece on the driving side bearing side or the driven side bearing side,
A vacuum pump comprising: a scattering regulating piece that regulates scattering of the lubricating oil scooped up by the scraping piece to the radially outer side of the scraping body on a radially outer side of the scraping piece. The timing gear is disposed between at least one of the drive-side bearing and the driven-side bearing and the scraping body;
The radial position of the scraping piece and the scattering restricting piece in the scraping body is located radially outside the outer peripheral edge of at least one of the drive gear and the driven gear facing the scraping body. The vacuum pump according to claim 1. The scattering restriction piece includes a front edge facing the front side in the rotation direction,
The vacuum pump according to claim 1, wherein the front edge is inclined with respect to the rotation axis from the front side to the rear side in the rotation direction. The scraping piece includes a front base portion on the front side in the rotational direction and a rear end portion on the rear side in the rotational direction,
The scattering restriction piece includes a rear edge facing the rear side in the rotation direction,
The position of the trailing edge in the rotational direction is set on the rear side in the rotational direction from the rear end or the rear end,
The distance in the rotation axis direction from the reference surface provided on the scraping body perpendicular to the rotation axis direction to the rear end is set to be equal to or less than the length in the rotation axis direction of the scattering restriction piece. The vacuum pump as described in any one of Claims 1-3 characterized by these. The scraping piece includes a front base portion on the front side in the rotational direction and a rear end portion on the rear side in the rotational direction,
The scattering restriction piece includes a rear edge facing the rear side in the rotation direction,
The distance in the rotational axis direction from the reference surface to the rear end is set to be equal to or less than the length in the rotational axis direction of the scattering restriction piece,
The vacuum pump according to claim 4, wherein the position of the trailing edge is set on the rear side in the rotational direction with respect to the rear end portion.   The vacuum pump according to claim 5, wherein the scattering restricting piece has a restricting surface facing a center side of the scraping body, and the restricting surface is perpendicular to the reference surface.

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