JP6368268B2 - Biaxial rotary pump and adjusting method thereof - Google Patents

Description

  In the present invention, the two rotors are rotated in the opposite direction at the same speed in a non-contact manner while maintaining a minute clearance, and the two rotors also maintain a minute clearance on the inner peripheral surface and inner end surface of the cylinder. Two rotating shafts including the rotor are supported by bearings so as to be rotated in a non-contact manner, and the bearing has one bearing side wall disposed on one end side of the rotor and the other end side of the rotor. Arranged on the other bearing side wall and arranged on a portion of the two rotating shafts extended in a cantilevered manner outside either the one bearing side wall or the other bearing side wall. The present invention relates to a biaxial rotary pump including a pair of meshing gears and an adjustment method thereof.

  Examples of the biaxial rotary pump include a claw pump, a roots pump, a screw pump, and a gear pump. For example, the present applicant discloses an exhaust structure and exhaust method of a claw pump that exhausts air from both end faces of a cylinder (see Patent Document 1).

  Further, the present applicant has disclosed a biaxial rotary pump capable of improving the relative centering accuracy of biaxial shaft centers and improving the pump performance by appropriately reducing the clearance, and a method for manufacturing the biaxial rotary pump. The two rotating shafts are received by one bearing side wall and the other bearing side wall so as to be rotated in a non-contact manner within the shaft, and transmit power from one rotating shaft to the other rotating shaft by a pair of gears. The bearing side wall portion, which is the bearing side wall portion on the power input side, is divided into two bearing holders to which the bearings for bearing the rotating shafts are fixed and the base portion of the bearing side wall portion. And two bearing holders are fixed to the base portion of the bearing side wall by a mounting structure that can be adjusted in a plane perpendicular to the two rotation axes (see Patent Document 2). That.

  Further, the present applicant has improved the relative centering accuracy of the biaxial shaft centers and appropriately reduced the clearance to improve the pump performance, and as a method for manufacturing the same, there are two rotors. Are rotated by one bearing side wall and the other bearing side wall so that the two rotating shafts are rotated in a non-contact manner in the cylinder, and power is supplied from one rotating shaft to the other rotating shaft by a pair of gears. The bearing holder part, to which the bearing receiving one end of one rotating shaft is fixed, can be adjusted in the plane perpendicular to the two rotating shafts with respect to the base part of the bearing side wall. And a structure in which one housing part is fixed by an attachment structure whose position is adjustable with respect to the other housing part (see Patent Document 3). There.

Further, in the embodiment of the biaxial rotary pump of the contrast technique shown in FIG. 5, one bearing side wall portion 11 which is a bearing side wall portion on the side to which power is input is provided by each bearing for bearing each rotary shaft 35, 36. It is divided into two fixed bearing holders 12A and 12B and a base body portion 11a of the bearing side wall, and the bearings are angular bearings 60A and 60B.
In the case of the angular bearings 60A and 60B, there is no play in the axial thrust direction, and therefore, the angular bearings 60A and 60B are fixed. Therefore, when the rotors 31 and 32 are heated and expanded by the pump operation, the direction is opposite to that of the angular bearings. The expanded rotors 31 and 32 protrude. For this reason, in comparison with the clearance (side clearance on one end side) between the rotor end faces 31a, 32a on the one bearing side wall 11 side and the inner end face 30a of the cylinder, it is on the other bearing side wall 21 side in advance. The clearance (side clearance on the other end side) between the rotor end surfaces 31b and 32b and the cylinder inner end surface 30b is set large.
For example, the ratio between the side clearance on one end side and the side clearance on the other end side is set to about 1: 5, and the side clearance on the other end side is large. The compressed or depressurized gas is likely to leak, resulting in a decrease in pump performance.

JP 2011-38476 A (first page) JP 2011-196247 A (first page) JP2011-196249A (first page)

The problem to be solved regarding the biaxial rotary pump and its adjustment method is to propose an appropriate method for adjusting the thrust direction (axial direction) clearance, which is the clearance between the end surface of the rotor and the end surface of the cylinder. There was not. If the clearance in the thrust direction cannot be adjusted, the balance of the clearance between the both end faces of the rotor and the inner end faces of both cylinders will be lost, and the pump performance will be reduced.
SUMMARY OF THE INVENTION An object of the present invention is to provide a biaxial rotary pump capable of improving pump performance by appropriately adjusting a clearance between an end face of a rotor and an inner end face of a cylinder, and an adjustment method thereof.

The present invention has the following configuration in order to achieve the above object.
According to one aspect of the biaxial rotary pump according to the present invention, the two rotors are rotated in the opposite direction at the same speed in a non-contact manner while maintaining a minute clearance, and the two rotors are connected to the inner peripheral surface of the cylinder. The two rotary shafts including the rotor are supported by a bearing so that the inner end surface can be rotated in a non-contact manner while maintaining a minute clearance, and the bearing is provided on one end side of the rotor. The bearing sidewall and the other bearing sidewall provided on the other end of the rotor are cantilevered outside either the one bearing sidewall or the other bearing sidewall. In the two-shaft rotary pump including a pair of gears arranged and meshed with the two rotary shafts, the bearing has play in the axial direction with respect to the positional relationship between the outer ring and the inner ring of the bearing. And mounting the bearing disposed on at least one of the one bearing side wall and the other bearing side wall with the outer end surface of the outer ring of the bearing in contact with the mounting shaft hole. A liner that is inserted between a bearing holder to be fixed and an edge of the mounting shaft hole, and that adjusts a clearance between an end surface of the rotor and an inner end surface of the cylinder ; and at least the pair of gears The liner used for mounting the bearing on either the one bearing side wall portion or the other bearing side wall portion on the side where the two rotating shafts are extended to have a thin sheet plate shape and a ring shape A notch provided so as not to form a closed ring, and the bearing retainer to attach the bearing. Wherein the constant bolts are cut containing the liner and a three bolt insertion holes to be inserted.

  Further, according to one embodiment of the biaxial rotary pump according to the present invention, the liner includes an edge of the bearing retainer and the mounting shaft hole in both the one bearing side wall and the other bearing side wall. The clearance between the end face of the rotor and the inner end face of the cylinder is adjusted.

  Further, according to one aspect of the biaxial rotary pump according to the present invention, the cylinder forming the pump chamber having a cross-sectional shape in which a part of two circles are overlapped with each other, and arranged in the cylinder and in non-contact with each other The claw pump may include the two rotors having the hook-shaped claw portions formed so as to compress the gas that is inhaled while being engaged.

  Further, according to one embodiment of the adjustment method of the biaxial rotary pump according to the present invention, the two rotors are rotated in the opposite direction at the same speed in a non-contact manner while maintaining a minute clearance, and the two rotors are Two rotating shafts including the rotor are supported by bearings so that the inner peripheral surface and the inner end surface of the cylinder are rotated in a non-contact manner while maintaining a minute clearance, and the bearings are disposed on one end side of the rotor. One bearing side wall provided and the other bearing side wall provided on the other end side of the rotor are arranged on the outer side of either the one bearing side wall or the other bearing side wall. A pair of gears arranged on and engaged with the two rotating shafts extended to be held, and the bearing has a play in the axial direction with respect to the positional relationship between the outer ring and the inner ring of the bearing. Concerning mounting of the bearing configured and disposed on at least one of the one bearing side wall and the other bearing side wall, the bearing is fixed to the mounting shaft hole by contacting the outer end surface of the outer ring of the bearing A biaxial rotary pump comprising a liner that is inserted between a bearing retainer to be mounted and an edge of the mounting shaft hole and that adjusts a clearance between an end surface of the rotor and an inner end surface of the cylinder. After the rotor is adjusted by adjusting the clearance between the two rotors so as to match the rotation angle in the rotation direction of the two rotors, the rotor is the clearance in the axial direction of the two rotation shafts using the liner. The clearance between the end face of the cylinder and the inner end face of the cylinder is adjusted.

  Moreover, according to one form of the adjustment method of the biaxial rotary pump which concerns on this invention, the said liner is made into the said bearing retainer in both the said one bearing side wall part and the said other bearing side wall part, and the said attachment shaft. The clearance between the end face of the rotor and the inner end face of the end face of the cylinder can be adjusted by inserting it between the edge of the hole.

  According to the biaxial rotary pump and the adjustment method thereof according to the present invention, it is particularly advantageous that the pump performance can be improved by appropriately adjusting the clearance in the thrust direction, which is the clearance between the end surface of the rotor and the inner end surface of the cylinder. There is an effect.

It is sectional drawing which shows the example of a form of the biaxial rotary pump which concerns on this invention. It is an expanded sectional view which shows the detail which concerns on the one bearing side wall part of the example of a form of FIG. It is an expanded sectional view which shows the detail which concerns on the other bearing side wall part of the example of a form of FIG. It is a top view which shows the form example of the liner which concerns on this invention. It is sectional drawing which shows the example of a form of the biaxial rotary pump used as a contrast technique.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a best mode embodiment of a biaxial rotary pump and an adjusting method thereof according to the present invention will be described in detail with reference to the accompanying drawings (FIGS. 1 to 4).
This biaxial rotary pump can be used as a compressor or blower by connecting the exhaust side to a pneumatic device, for example, and can be used as a vacuum pump by connecting the intake side to a pneumatic device. Moreover, it is not limited to air, It can utilize also as a rotary pump apparatus which sucks and exhausts about other gas.

  In the biaxial rotary pump according to the present invention shown in FIG. 1, the two rotors 31 and 32 are rotated at the same speed in opposite directions in a non-contact manner while maintaining a minute clearance. The two rotary shafts 35 and 36 including the rotors 31 and 32 are provided with bearings 15A, 15B, and 25A so that the inner peripheral surface 30c and the inner end surfaces 30a and 30b of the cylinder 30 are rotated in a non-contact manner while maintaining a minute clearance. , 25B, and the bearings 15A, 15B, 25A, and 25B are provided on one end side of the rotors 31 and 32, and on the other end side of the rotors 31 and 32. In this embodiment, the input shaft portion 3 is a portion where one of the rotating shafts 35 is extended to the outside of one of the bearing sidewall portions 11 and the power is connected. a is located, it is arranged in two sites of the rotary shaft 35, 36 which extend cantilevered outwardly of the other bearing side wall portion 21 comprises a pair of gears 39, 39 meshing.

  Further, in this embodiment, one housing part 10 having one bearing side wall part 11 that receives one end side of the two rotating shafts 35 and 36, and the one housing part 10 are provided as separate parts and are provided as two parts. And the other housing portion 20 having the other bearing side wall portion 21 that receives the other end side of the rotating shafts 35, 36, and from one rotating shaft 35 to the other rotating shaft 36 in the opposite direction by a pair of gears 39, 39. It is provided to rotate at the same speed.

  Further, in the present invention, the bearings 15A, 15B, 25A, 25B are constituted by those having play in the axial direction (thrust direction) with respect to the positional relationship between the outer rings 15c, 25c of the bearings and the inner rings 15e, 25e. The bearings 15A, 15B, 25A, and 25B according to the present embodiment are deep groove ball bearings and have play as play that allows movement in a minute range in the thrust direction.

  And regarding attachment of bearing 15A, 15B, 25A, 25B distribute | arranged to at least one bearing side wall part 11 and 21 of one bearing side wall part 11 and the other bearing side wall part 21, of the outer ring | wheels 15c and 25c of the bearing Inserted between the bearing retainers 16A, 16B, 26A, 26B that abut against the outer end surfaces 15d, 25d and are fixed to the mounting shaft holes 12a, 22a, and the edge portions 12, 22 of the mounting shaft holes, the end surfaces of the rotor A liner 50 is provided to adjust the clearance between 31a, 31b, 32a, 32b and the inner end faces 30a, 30b of the cylinder. The liner 50 according to this embodiment is formed in a thin sheet plate shape in a ring shape, can be formed of a material such as a paper material or a metal material, and is configured such that the clearance can be adjusted by the thickness (FIG. 4). reference). The adjustment of the thickness can be easily performed by using a plurality of liners 50 superimposed on each other or using liners 50 having different thicknesses.

In this embodiment, as shown in FIGS. 2 and 3, the liner 50 includes the bearing retainers 16 </ b> A, 16 </ b> B, 26 </ b> A, 26 </ b> B and the mounting shaft on both the bearing side wall 11 and the other bearing side wall 21. Inserted between the edge portions 12 and 22 of the hole, the clearance between the rotor end faces 31a, 31b, 32a and 32b and the cylinder inner end faces 30a and 30b is adjusted.
The bearing retainers 16A, 16B, 26A, and 26B of the present embodiment are fixed to the edge portions 12 and 22 of the mounting shaft holes with bolts 18 with the liner 50 being sandwiched therebetween. More specifically, the inner diameter side portions of the bearing retainers 16A, 16B, 26A and 26B abut against the outer end faces 15d and 25d of the outer rings 15c and 25c of the bearing, and the outer diameter side of the bearing retainers 16A, 16B, 26A and 26B The bearing retainers 16A, 16B, 26A, and 26B are formed in a flat belt-like ring shape so that the portions are fixed to the edge portions 12 and 22 of the mounting shaft hole with the liner 50 interposed therebetween.
Further, the edge 12 of the mounting shaft hole of one bearing side wall 11 forms the mounting shaft hole 12a into which the rotation shafts 35 and 36 of the bearing holders 12A and 12B are inserted and into which the bearings 15A and 15B are fitted. The edge portion 22 of the mounting shaft hole of the other bearing side wall portion 21 is constituted by an edge portion, and forms the mounting shaft hole 22a into which the rotation shafts 35 and 36 are inserted and the bearings 25A and 25B are fitted. It is constituted by.

According to this, the clearance between the rotor end faces 31a, 31b, 32a, 32b and the cylinder inner end faces 30a, 30b can be adjusted appropriately, and the pump performance can be improved.
Further, by adjusting the both end sides of the rotors 31 and 32 using the liner 50, the clearance can be set more appropriately in a well-balanced manner, and the amount of leakage of gas compressed or reduced in the cylinder 30 can be further increased. The sealing performance can be improved so as to reduce the pump performance. That is, it is possible to increase the flow rate of the pump and increase the ultimate vacuum. Further, the bearing retainers 16A, 16B, 26A, and 26B can suppress a certain amount of thermal expansion in the thrust direction, and prevent the rotor end faces 31a, 31b, 32a, and 32b from contacting the cylinder inner end faces 30a and 30b. Yes, and the range of operating vacuum can be expanded.

Moreover, as shown in FIG. 4, the liner 50 used for at least the other bearing side wall portion 21 may be a cut-in liner 50A provided so as not to have a closed ring shape. In this embodiment, the bearing side wall on the side where the two rotary shafts 35 and 36 are extended so as to include the pair of gears 39 and 39 is the other side wall 21. In addition, 51 is a notch part and 52 is a bolt insertion hole.
Since the other bearing side wall portion 21 of the present embodiment is engaged with a pair of gears 39 and 39 arranged on the two rotating shafts 35 and 36 on the outside thereof, a closed ring-shaped liner 50 is used. However, the cut-in liner 50A can be inserted properly by bending it to be twisted, and the clearance can be adjusted easily.

  The biaxial rotary pump shown in FIG. 1 is arranged in a cylinder 30 that forms a pump chamber having a cross-sectional shape in which a part of two circles are overlapped, and meshes in a non-contact state with each other. The claw pump is provided with two rotors 31 and 32 each having a hook-shaped claw portion formed so that the sucked gas can be compressed, and exhausts from the side walls at both ends of the cylinder 30. The present invention is not limited to such a claw pump but can be applied to other biaxial rotary pumps such as a roots pump and a screw pump.

Next, another configuration of the present embodiment will be briefly described.
In this embodiment, as shown in FIG. 1 and FIG. 2, each bearing 15 </ b> A, which is one of the bearing side walls 11 on the side where power is input, receives one end side of each rotating shaft 35, 36. 15B is divided into two bearing holders 12A and 12B and a base portion 11a of the bearing side wall, and the two bearing holders 12A and 12B are rotated two times with respect to the base portion 11a of the bearing side wall. It is fixed by a mounting structure whose position can be adjusted in a plane orthogonal to the shafts 35 and 36.

  Further, in the mounting structure of this embodiment, as shown in FIGS. 1 and 2, the bearing holders 12 </ b> A and 12 </ b> B can be adjusted within a predetermined range on the base body portion 11 a of the bearing side wall portion of one bearing side wall portion 11. A stepped portion formed by being dug larger than the bearing holders 12A and 12B is formed so as to fit. Further, fastening bolts (not shown) are used as means for fixing the bearing holders 12A and 12B to the base portion 11a of the bearing side wall.

Further, one housing part 10 is formed by integrally molding one bearing side wall part 11, side peripheral wall part 13, and one end wall part 14 of the cylinder, and a part surrounded by these wall parts. However, the space 17 for the intake / exhaust passage is provided.
The other housing part 20 is configured by integrally molding the other bearing side wall part 21, the side peripheral wall part 23, and the other end wall part 24 of the cylinder, and a portion surrounded by these wall parts is It is a space 27 for intake and exhaust passages.
One housing part 10 is fixed to the other housing part 20 by fastening bolts 28.

The cylinder 30 is surrounded by one end wall portion 14 of the cylinder provided on the other end side of the one housing portion 10, the side peripheral wall portion 23 of the other housing portion 20, and the other end wall portion 24 of the cylinder. Is formed.
The inner end surface 30b of the cylinder is used as a reference surface for centering the rotary shafts 35 and 36 by bringing the end surfaces 31b and 32b of the rotor into contact with each other during assembly.

  Two bearings 25A and 25B are fixed to the other bearing side wall 21. The other end of one rotating shaft 35 is supported by the bearing 25A, and the other end of the other rotating shaft 36 is supported by the bearing 25B. ing.

Further, as shown in FIG. 1, reference numeral 40 denotes a gear box, which is fixed to the other housing portion 20 by fastening bolts 29.
Further, as shown in FIGS. 1 and 3, reference numeral 41 denotes an oil swing-off structure. It is arranged outside the disc spring 42. The bearings 25A and 25B are disposed outside the oil swinging structures 41 and 41 so as to be fitted in the mounting shaft holes 22a.
Reference numeral 43 denotes an oil seal that seals oil from leaking out of the gear chamber 45 formed by the oil bath type gear box 40.
Reference numeral 35a denotes an input shaft portion of the rotating shaft, which extends so as to be connected to a rotating shaft on the driving source side such as an electric motor (not shown) through a coupling.

An assembly method and a clearance adjustment method for the biaxial rotary pump having the above configuration will be described below.
The rotors 31 and 32 are press-fitted into a pair of shaft holes provided in the other housing part 20, and the other ends of the rotary shafts 35 and 36 into which the sleeves 37 and 37 are inserted are inserted. Next, the oil seal 43, the disc spring 42, and the oil swing-off structure 41 are set on the other bearing side wall portion 21 of the other housing portion 20 while being fitted on the rotary shafts 35 and 36. Then, bearings 25A and 25B are press-fitted into the other end sides of the rotary shafts 35 and 36, respectively. Further, after adjusting the clearance between the drive rotor (rotor 31) and the driven rotor (rotor 32), gears 39, 39 are attached to the rotary shafts 35, 36 to adjust the rotation angles of the rotors 31, 32. The assembly is performed with reference to the axis of the rotary shafts 35 and 36 defined by bringing the rotor end faces 31b and 32b into contact with the inner end face 30b of the cylinder.

Next, the bearings 15A and 15B are press-fitted into one side of the rotary shafts 35 and 36 in a state where the two bearing holders 12A and 12B and the base portion 11a of the bearing side wall are assembled so as to be position-adjustable. By transmitting the driving force to the rotating shaft 35, the one rotating shaft 35 and the other rotating shaft 36 are simultaneously rotated, and the two bearing holders 12A and 12B are held in a state where both are properly rotated. It fixes to the base | substrate part 11a of a bearing side wall part.
By rotating the rotary shafts 35 and 36 in this manner, the positions of the bearings 15A and 15B are automatically adjusted so that the rotary shafts 35 and 36 can be smoothly rotated, and the centering operation is automatically performed.

  In other words, the bearings 15A and 15B can be properly positioned with reference to the shaft (rotating shafts 35 and 36), and in this state, the bearing holders 12A and 12B are fixed to the base portion 11a of the bearing side wall portion while maintaining the shaft reference. it can. By assembling in this way, the radial clearance that is the centering of the two rotating shafts 35 and 36 can be appropriately set.

  According to this, since the relative centering accuracy of the shaft centers of the two rotary shafts 35 and 36 can be improved, between the rotors 31 and 32 or between the rotors 31 and 32 and the inner peripheral surface 30c of the cylinder. The clearance can be appropriately reduced, and as a result, the pump performance can be improved. Further, since the bearings 15A and 15B can be arranged on the basis of the shafts (rotating shafts 35 and 36), it is possible to prevent the load from being applied to the bearings 15A and 15B and to extend their life.

And according to this invention, the side clearance which is a clearance of an axial direction (thrust direction) is adjusted with the liner 50 about the both ends of the rotors 31 and 32. FIG.
That is, after assembling by adjusting the clearance between the two rotors 31 and 32 so as to match the rotation angle in the rotation direction of the two rotors 31 and 32, the two rotation shafts 35, The clearance between the rotor end faces 31a, 31b, 32a, and 32b and the cylinder inner end faces 30a and 30b, which are clearances in the axial direction of 36, is adjusted.

Further, the adjustment of the side clearance on the side of the gears 39, 39 can be performed without removing the gears 39, 39 by using the cut-in liner 50A. That is, by making a cut in the liner 50, the side clearance can be easily adjusted even in a rotary pump having a pair of gears 39, 39 for transmitting biaxial power.
Then, along with the adjustment of the side clearance, by fixing the bearing retainers 16A, 16B, 26A, and 26B, the movement in the thrust direction can be limited.
It should be noted that when the side clearance can be adjusted only on one end side of the rotors 31 and 32, it is needless to say that adjustment on both end sides is not required.

According to this, the clearance (side clearance) between the rotor end faces 31a, 31b, 32a, 32b and the cylinder inner end faces 30a, 30b in the two-shaft rotor dual-support pump can be adjusted evenly on both sides. The pump performance can be improved.
That is, the rotor end faces 31a, 31b, 32a, 32b and the inner end face of the cylinder due to thermal expansion in the thrust direction due to the side clearance adjustment on both ends of the rotors 31, 32 and the action of the bearing retainers 16A, 16B, 26A, 26B. Contact with 30a, 30b can be suppressed, pump lock and oil leakage can be prevented, and operation at a higher degree of vacuum than before can be performed.

  As described above, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

DESCRIPTION OF SYMBOLS 10 One housing part 11 One bearing side wall part 11a Base part of bearing side wall part 12 Edge part of mounting shaft hole 12a Mounting shaft hole 12A Bearing holder 12B Bearing holder 13 Side peripheral wall part 14 One end wall part 15A of a cylinder Bearing 15B Bearing 15c Outer ring 15d Outer ring outer end face 15e Inner ring 16A Bearing retainer 16B Bearing retainer 17 Space for intake / exhaust passage 18 Bolt 20 The other housing portion 21 The other bearing side wall portion 22 The edge portion of the mounting shaft hole 22a The mounting shaft Hole 23 Side peripheral wall portion 24 Other end wall portion of cylinder 25A Bearing 25B Bearing 25c Outer ring 25d Outer end surface of outer ring 25e Inner ring 26A Bearing retainer 26B Bearing retainer 27 Space for intake / exhaust passage 28 Fastening bolt 29 Fastening bolt 29 G 30 Cylinder 30a Cylinder inner end surface 30b Cylinder inner end surface 30c Cylinder inner peripheral surface 31 Rotor 31a Rotor end surface 31b Rotor end surface 31c Rotor peripheral surface 32 Rotor 32a Rotor end surface 32b Rotor end surface 32c Rotor peripheral surface 35 Rotating shaft 35a Input shaft portion 36 Rotating shaft 37 Sleeve 39 Gear 40 Gear box 41 Oil swing-off structure 42 Disc spring 43 Oil seal 45 Gear chamber 50 Liner 50A Cut-in liner 51 Cut portion 52 Bolt insertion hole 60A Angular bearing 60B Angular bearing bearing

Claims (3)

The two rotors are rotated in the opposite direction at the same speed in a non-contacting manner while maintaining a minute clearance, and the two rotors are rotated in a non-contacting manner while maintaining a minute clearance on the inner peripheral surface and inner end surface of the cylinder. As described above, the two rotary shafts including the rotor are supported by bearings, and the bearings are provided on one bearing side wall provided on one end side of the rotor and on the other end side of the rotor. A pair of two shafts which are arranged on the other bearing side wall and are cantilevered on the outer side of either the one bearing side wall or the other bearing side wall. In a biaxial rotary pump with gears,
The bearing is constituted by one having play in an axial direction with respect to a positional relationship between an outer ring and an inner ring of the bearing;
With respect to mounting of the bearing disposed on at least one of the one bearing side wall and the other bearing side wall, a bearing retainer that abuts the outer end surface of the outer ring of the bearing and fixes the bearing to the mounting shaft hole. And a liner that is inserted between an edge of the mounting shaft hole and adjusts a clearance between an end surface of the rotor and an inner end surface of the cylinder ,
At least the liner used for mounting the bearing on either the one bearing side wall or the other bearing side wall on the side where the two rotation shafts are extended to include the pair of gears is thin. One notch portion provided in a ring shape with a sheet plate shape so as not to be a closed ring shape, and three bolt insertion holes through which bolts for fixing the bearing retainer so as to attach the bearing are inserted A biaxial rotary pump characterized by being a notched liner comprising   The liner is inserted between the bearing retainer and the edge of the mounting shaft hole in both the one bearing side wall and the other bearing side wall, and the end face of the rotor and the inside of the cylinder The biaxial rotary pump according to claim 1, wherein a clearance between the end face and the end face is adjusted. The cylinder forming a pump chamber having a cross-sectional shape in which a part of two circles are overlapped with each other, and a bowl-shaped claw arranged in the cylinder so as to be able to compress inhaled gas that is engaged with each other in a non-contact state The biaxial rotary pump according to claim 1 or 2 , wherein the pump is a claw pump including the two rotors formed with a portion.

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