JP2002115685A - Lubrication structure in fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily lubricate a section requiring lubrication in a chamber storing a gear mechanism without increasing a size of fluid machinery. SOLUTION: Lubricating oil Y is collected in a gear storage chamber 331 storing the gear mechanism consisting of gears 34, 35. A plurality of oil scraping-up grooves 46 are formed on an end face 341 on one side of the gear 34. The oil scraping-up groove 46 is extended in the radial direction from a side of the center of rotation of the gear 34. Lubricating oil Y is scraped up by rotation operation of the gear 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for moving a fluid transfer body based on the rotation of a plurality of rotating shafts, transferring a fluid by the operation of the fluid transfer body, and using a gear mechanism comprising a plurality of gears. The present invention relates to a lubricating structure in a fluid machine in which the rotating shaft is rotated in synchronization, the gear mechanism is housed in an oil storage chamber, and a part of the gear mechanism is immersed in stored lubricating oil.

[0002]

2. Description of the Related Art Roots pumps, which are a kind of vacuum pumps disclosed in Japanese Patent Application Laid-Open Nos. 2-157490 and 8-14172, rotate in a state where two adjacent rotors mesh with each other. Is done. Rotate while meshing 2
The rotation of the individual rotors transfers gas. One of the rotating shafts of the rotor obtains driving force from a motor, and the other rotating shaft obtains driving force from the one rotating shaft via a gear mechanism.

[0003] Lubricating oil is stored in a chamber accommodating the gear mechanism. The rotating shaft is rotatably supported by a radial bearing in a room accommodating the gear mechanism. The lubricating oil that lubricates the gear mechanism also lubricates the radial bearing.
For good lubrication of the radial bearing, measures are taken to rotate a member for scraping oil such as an oil ring disclosed in Japanese Patent Laid-Open Publication No. 3-89080 integrally with the rotating shaft. The oil ring that rotates integrally with the rotating shaft scrapes up the stored oil, and the scooped oil is used for lubrication of the radial bearing.

[0004]

However, the configuration in which an oil scraping member such as an oil ring is attached to the rotating shaft is described below.
Increase the space in the chamber that houses the gear mechanism. Such an increase in space increases the size of the vacuum pump.

An object of the present invention is to provide a lubricating structure capable of satisfactorily lubricating a portion requiring lubrication in a room accommodating a gear mechanism without increasing the size of a fluid machine.

[0006]

SUMMARY OF THE INVENTION For this purpose, the present invention provides a gear mechanism comprising a plurality of gears, which moves a fluid transfer body based on rotation of a plurality of rotating shafts, transfers fluid by the operation of the fluid transfer body. A plurality of the rotating shafts are used to rotate in synchronization, and the gear mechanism is accommodated in an oil storage chamber,
The invention of claim 1 is directed to a fluid machine in which a part of the gear mechanism is immersed in stored lubricating oil, and an oil scraper is integrally formed on an end face of at least one of the plurality of gears. did.

[0007] The oil scraping section provided on the rotating gear is immersed in the oil stored in the oil storage chamber, and scrapes the oil by rotation. The oil scooped up by the oil scooping section is used for lubrication of a portion requiring lubrication in the oil storage chamber. The configuration in which the oil scraping part is integrally formed on the end face of the gear,
Eliminates the need for more oil storage space.

[0008] In the invention of claim 2, in claim 1,
The oil scraping portion was a recess. The recess is convenient as an oil scraper. According to a third aspect of the present invention, in the second aspect, the recess is a groove extending in a radial direction of the gear.

[0009] Such a groove is suitable for efficiently scraping up the stored oil. According to a fourth aspect of the present invention, in the first aspect, the oil scraping portion is a convex portion. The convex portion is simple as an oil scraping portion.

[0010] According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the rotating shaft is rotatably supported by a bearing in the oil storage chamber. The end face of the gear provided was an end face on the side facing the bearing.

The structure in which the oil scraping portion is provided on the end face of the both ends of the gear which is closer to the bearing is optimal for good lubrication of the bearing. According to a sixth aspect of the present invention, in the fluid machine according to any one of the first to fifth aspects, the fluid machine arranges a plurality of the rotating shafts in parallel and arranges a rotor on each of the rotating shafts. A plurality of pump chambers accommodating a plurality of rotors meshed with each other on a rotating shaft that fit together and a plurality of pump chambers accommodating a plurality of rotors engaged with each other as a set, or a vacuum pump having a single pump chamber, which is adjacent to the oil storage chamber The lip seal is arranged at a position of the rotating shaft between the pump chamber and the oil storage chamber.

A lip seal for preventing oil from entering the pump chamber along the peripheral surface of the rotary shaft from the oil storage chamber is lubricated by the oil scraped up by the oil scraper.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is embodied in a roots pump will be described below with reference to FIGS.

As shown in FIG. 1, the multi-stage roots pump 11
A front housing 13 is joined to a front end of the rotor housing 12 of the first embodiment, and a closing body 36 is joined to the front housing 13. A rear housing 14 is joined to the rear end of the rotor housing 12. The rotor housing 12 includes a cylinder block 15 and a plurality of partition walls 1.
6 As shown in FIG. 2B, the cylinder block 15 includes a pair of block pieces 17 and 18, and the partition 16 includes a pair of wall pieces 161 and 162. As shown in FIG. 1, the space between the front housing 13 and the partition 16, the space between the adjacent partitions 16, and the space between the rear housing 14 and the partition 16 are each a pump chamber 3.
9, 40, 41, 42, 43.

A pair of rotating shafts 19, 20 are rotatably supported by the front housing 13 and the rear housing 14 via radial bearings 21, 37, 22, 38. The radial bearings 21 and 22 are lubricated by the sealed grease. Both rotating shafts 19 and 20 are arranged parallel to each other. The rotating shafts 19 and 20 are the partition 1
6 is passed.

A plurality of rotors 23, 24,
25, 26, 27 are integrally formed, and the same number of rotors 28, 29, 30, 31, 32 are integrally formed on the rotating shaft 20. The rotors 23 to 32 are
Are seen to be in the directions of the axes 191 and 201 of FIG. The thicknesses of the rotors 23, 24, 25, 26, and 27 are made smaller in this order.
Similarly, the thicknesses of 8, 29, 30, 31, and 32 also become smaller in this order. The rotors 23 and 28 are housed in the pump chamber 39 in a state of meshing with each other, and the rotors 24 and 29 are also housed in the pump chamber 40 in a state of meshing with each other. Hereinafter, similarly, the rotor 25,
30 is a pump chamber 41, rotors 26 and 31 are pump chambers 4
2, the rotors 27 and 32 are housed in a pump chamber 43, respectively.

The gear housing 3 is mounted on the rear housing 14.
3 are assembled. The rotating shafts 19 and 20 penetrate the rear housing 14 and protrude into a gear housing chamber 331 in the gear housing 33. The protruding ends of the rotating shafts 19 and 20 are engaged with gears 34 and 35, respectively. It is fixed. An electric motor M is mounted on the gear housing 33. The driving force of the electric motor M is
0 is transmitted to the rotating shaft 19 via an electric motor M, and the rotating shaft 19 is driven by an arrow R in FIGS. 2 (a), 2 (b) and 2 (c).
It is rotated in one direction. The rotating shaft 20 obtains a driving force from the electric motor M via the rotating shaft 19 and the gears 34 and 35, and the rotating shaft 20 is provided as indicated by an arrow R2 in FIGS. 2 (a), 2 (b) and 2 (c). , And rotates in the direction opposite to the rotation shaft 19. That is, the rotating shafts 19 and 20 are provided with gears 3 having the same number of teeth and the same diameter.
The gears are rotated synchronously by a gear mechanism composed of 4, 35.

As shown in FIG. 1 and FIG.
A passage 163 is formed in 6. As shown in FIG. 2B, an inlet 164 and an outlet 165 of the passage 163 are formed in the partition 16. Adjacent pump chamber 39,4
0, 41, 42, 43 communicate with each other via a passage 163.

As shown in FIG. 2A, the block 17
Is formed such that an inlet 171 communicates with the pump chamber 39. As shown in FIG.
Is formed so that a discharge port 181 communicates with the pump chamber 43. The gas introduced into the pump chamber 39 from the inlet 171 is transferred from the inlet 164 of the partition 16 via the passage 163 to the adjacent pump chamber 40 by the rotation of the rotors 23 and 28. Hereinafter, similarly, the gas flows in the order of decreasing volume of the pump chamber, that is, the pump chamber 4
The transport is performed in the order of 0, 41, 42, 43. Pump room 43
The gas transferred to the outside is discharged from the outlet 181 to the outside. The rotors 23 to 32 are fluid transfer bodies that transfer gas.

As shown in FIG. 1, a lubricating oil Y is accommodated in a gear accommodation chamber 331 for accommodating a gear mechanism composed of gears 34 and 35.
Are stored, and are immersed below the gear 34. Rotary shaft 19 between radial bearing 37 and pump chamber 43
Is provided with a lip seal 44. The lip seal 44 is provided between the gear housing chamber 331 serving as an oil storage chamber and the rotating shaft 1.
The lubricating oil is prevented from leaking to the pump chamber 43 side along the peripheral surface of No. 9. A lip seal 45 is disposed on the rotating shaft 20 between the radial bearing 38 and the pump chamber 43.
The lip seal 45 is provided between the gear housing chamber 331 and the rotating shaft 20.
To prevent the leakage of the lubricating oil to the pump chamber 43 side along the peripheral surface of.

As shown in FIGS. 3 and 4, one end face 341 of the gear 34 has a plurality of oil scraping grooves 46 formed therein. The oil scraping groove 46 extends in the radial direction from the rotation center side of the gear 34 and is immersed in the stored lubricating oil Y. The lubricating oil Y stored in the gear housing chamber 331 is actively scraped up by the oil scraping groove 46 with the rotation of the gear 34. The lubricating oil Y that has been lifted is the gears 34, 35,
Radial bearings 37, 38 and lip seals 44,
45 lubrication.

In the first embodiment, the following effects can be obtained. (1-1) The oil scraping groove 46 formed on the end face 341 of the gear 34 scrapes up the stored oil more efficiently than the toothed portion of the gear 34. The configuration in which the oil scraping groove 46 is integrally formed on the end face 341 of the gear 34 eliminates the need for a space for newly providing the oil scraping groove 46. Therefore, the configuration in which the oil scraping groove 46 is integrally formed on the end face 341 of the gear 34 eliminates the need to increase the space of the gear storage chamber 331 serving as the oil storage chamber.

(1-2) The number and depth of the oil scraping grooves 46 affect the efficiency of scraping the stored oil by the oil scraping grooves 46. The greater the number of oil scraping grooves 46, the higher the scraping efficiency, and the deeper the oil scraping grooves 46, the higher the scraping efficiency. The number and depth of the oil scraping grooves 46 can be selected within a range where the necessary strength of the gear 34 can be secured without increasing the thickness of the gear 34. The oil scraping groove 46 that can be formed integrally with the end face 341 of the gear 34 without increasing the thickness of the gear 34 is suitable as an oil scraping portion.

(1-3) A part of the lubricating oil Y that has entered the oil raking groove 46 is repelled upward from the gear 34 by centrifugal force. The oil scraping groove 46 having a shape extending in the radial direction of the gear 34 is suitable for efficiently scraping the stored oil.

(1-4) The oil scraping groove 46 is formed on the end face 3 of the gear 34 facing the radial bearing 37 as a bearing.
41 are formed. The configuration in which the oil scooping groove 46 is formed on the end face 341 of the gear 34 facing the radial bearing 37 and the lip seal 44 is such that the scattering area of the lubricating oil scooped up by the oil scooping groove 46 is relieved by the radial bearing. 37, 38 and lip seal 4
Approach 4,45. The radial bearings 37, 38 and the lip seals 44, 45 are scraped up by the oil scraping groove 46, and the closer the splashed area of the splashed lubricating oil Y, the more the lubrication of the radial bearings 37, 38 and the lip seals 44, 45. Is performed well. Therefore, the configuration in which the oil scraping groove 46 is provided on the end face 341 of the both end faces of the gear 34 which is closer to the radial bearing 37 is constituted by the radial bearings 37 and 38 and the lip seals 44 and 4.
5 is optimal for good lubrication.

(1-5) In a vacuum pump, pump chambers 39 to
It is important to prevent the lubricating oil from entering the base 43. The lip seals 44 and 45 are configured so that the lubricating oil in the gear housing chamber 331 is
Although it is prevented from intruding into the pump chamber 39 along the peripheral surfaces of the nip seals 9 and 20, the oil intrusion prevention function deteriorates when the lip seals 44 and 45 deteriorate. Good lubrication of the lip seals 44, 45 is indispensable to delay the deterioration of the lip seals 44, 45. The action of the oil scraping groove 46 contributes to good lubrication of the lip seals 44, 45.

Next, a second embodiment shown in FIG. 5 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. A plurality of oil scraping protrusions 47 are integrally formed on the end surface 341 of the gear 34. The oil-raising convex portion 47 rakes up the stored oil, and the lubricating oil raked by the oil-raising convex portion 47 is used for lubrication of the gears 34 and 35, the radial bearings 37 and 38, and the lip seals 44 and 45. . The oil scraping protrusion 47 is simple as an oil scraping part.

Rear housing 14 and end face 34 of gear 34
1, there is a space, and the height of the oil scraping protrusion 47 is smaller than the distance between the rear housing 14 and the end surface 341. Rear housing 14 and end surface 34
The space between 1 and 2 is optimal as an installation place of the oil scraping projection 47 in that a new installation space for the oil scraping projection 47 is not required.

Next, a third embodiment shown in FIG. 6 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. A plurality of oil scraping holes 48 are formed in the end face 341 of the gear 34. The direction in which the oil scraping hole 48 is dug is perpendicular to the end face 341. The formation of such an oil scraping hole 48 is very simple. or,
By increasing the diameter of the oil scraping hole 48, the oil scraping efficiency can be improved.

Next, a fourth embodiment shown in FIG. 7 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. A plurality of oil scraping holes 49 are formed in the end face 341 of the gear 34. The oil scraping hole 49 is
Is dug down so as to incline in a direction opposite to the rotation direction R1 of FIG. That is, the hole 49 drilled from the end face 341 toward the other end face is inclined in the direction opposite to the rotation direction R1. The oil scraping hole 49 dug down so as to incline in the direction opposite to the rotation direction R1 of the gear 34 makes it easier to scoop up oil than the oil scraping hole 48 in the third embodiment. The oil scraping efficiency is higher than the oil scraping hole 48 in the third embodiment.

Next, a fifth embodiment shown in FIGS. 8A and 8B will be described. The same components as those in the first embodiment are denoted by the same reference numerals. A plurality of oil scraping grooves 50 are also formed on the front end face 342 side of the gear 34. Gear 34
The oil scraping grooves 46 and 50 are formed with inclinations opposite to each other with respect to the rotation direction. Both end surfaces 341 and 342
The configuration in which the oil scooping grooves 46 and 50 are formed further improves the oil scooping efficiency.

In the present invention, the following embodiments are also possible. (1) A configuration in which a part of each of the gears 34 and 35 is immersed in the stored oil, and both gears 34 and 35 are provided with an oil scraper. (2) The present invention is applied to a vacuum pump having three or more rotating shafts. (3) The present invention is applied to a fluid machine other than the vacuum pump.

[0033]

As described above in detail, according to the present invention, since the oil scraping portion is integrally formed on the end face of at least one of the plurality of gears, the gear mechanism can be provided without increasing the size of the fluid machine. An excellent effect is obtained in that the lubrication-required portions in the room to be accommodated can be satisfactorily lubricated.

[Brief description of the drawings]

FIG. 1 shows a multi-stage roots pump 11 according to a first embodiment.
FIG.

FIG. 2A is a sectional view taken along line AA of FIG. (B) is FIG.
BB sectional drawing of FIG. (C) is a sectional view taken along line CC of FIG. 1.

FIG. 3 is a sectional view taken along line DD of FIG. 1;

FIG. 4 is a perspective view of a main part.

FIG. 5 is a perspective view of a main part showing a second embodiment.

FIG. 6 is an essential part perspective view showing a third embodiment.

FIG. 7 is a rear view of an essential part showing a fourth embodiment.

FIG. 8 shows the fifth embodiment, and (a) is a rear view of a main part. (B) is a principal part front view.

[Explanation of symbols]

11 Multi-stage roots pump which is a vacuum pump. 19, 20
…Axis of rotation. 23, 24, 25, 26, 27, 28, 2
9,30,31,32 ... rotors which are fluid transfer bodies. 33
1 ... Gear storage chamber that serves as an oil storage chamber. 34, 35 ... gears constituting a gear mechanism. 341 ... End face. 37, 38: Radial bearings that serve as bearings. 44, 45 ... lip seal.
46, 50: Oil scraping grooves which are oil scraping parts. 47 ...
The oil-raising convex part which is the oil-raising part. 48, 49 ... oil scraping holes which are oil scraping parts.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16H 57/02 304 F16H 57/02 304D 57/04 57/04 N Q F16N 7/18 F16N 7/18 F Terms (reference) 3H003 AA05 AB07 AC04 BC01 BD04 CA01 3H029 AA06 AA09 AA18 AB06 BB01 CC08 CC19 CC32 3J063 AA40 BA11 BB03 CA01 CB13 CD02 XD03 XD16 XD33 XD62 XD71 XD73 XE15

Claims (6)

[Claims] A fluid transfer body is moved based on the rotation of a plurality of rotating shafts, fluid is transferred by the operation of the fluid transferring body, and the plurality of rotating shafts are synchronized using a gear mechanism including a plurality of gears. In the fluid machine in which the gear mechanism is accommodated in the oil storage chamber and a part of the gear mechanism is immersed in the stored lubricating oil, the end face of at least one of the plurality of gears is A lubrication structure in a fluid machine with an integrated oil scraper. 2. The lubricating structure according to claim 1, wherein the oil scraping portion is a concave portion. 3. The lubricating structure according to claim 2, wherein the recess is a groove extending in a radial direction of the gear. 4. The lubricating structure in a fluid machine according to claim 1, wherein said oil scraping portion is a convex portion. 5. The rotating shaft is rotatably supported by a bearing in the oil storage chamber, and an end face of the gear provided with the oil scraping portion is an end face on a side facing the bearing. A lubrication structure for a fluid machine according to any one of claims 1 to 4. 6. The fluid machine, wherein a plurality of the rotating shafts are arranged in parallel, and a rotor is arranged on each of the rotating shafts.
A plurality of pump chambers accommodating the rotors on the adjacent rotating shafts and accommodating a plurality of rotors engaged with each other as one set, or a vacuum pump including a single pump chamber, wherein the oil storage chamber The lubricating structure for a fluid machine according to any one of claims 1 to 5, wherein a lip seal is disposed at a position of a rotating shaft between an adjacent pump chamber and the oil storage chamber.