JP5584862B2 - Biaxial rotary pump and manufacturing method thereof - Google Patents

Description

  The present invention relates to a biaxial rotary pump that can be used as a compressor or a blower by using an exhaust side, for example, and a vacuum pump that can be used as a vacuum pump by using an intake side, and a manufacturing method thereof.

  Examples of the biaxial rotary pump include a claw pump, a roots pump, a screw pump, and a gear pump. As a specific example, a claw pump that exhausts air from both end faces of the cylinder 110 as shown in FIGS. 4 to 6 has been developed by the present applicant and has been filed as a patent application (Japanese Patent Application No. 2009-186891). Further, a claw pump that exhausts air from one end surface of the cylinder 210 shown in FIGS. 7 and 8 has been developed by the present applicant, and a patent application (Japanese Patent Application No. 2009-212878) has been filed.

The claw pump shown in FIGS. 4 to 6 will be described below as a control technique example of the present invention.
Reference numeral 110 denotes a cylinder, which forms a pump chamber 111 having a cross-sectional shape obtained by superimposing a part of two circles. 120A is one side plate portion, and is provided so as to block one end face of the cylinder 110. Reference numeral 120B denotes the other side plate portion, which is provided so as to close the other end face of the cylinder 110.

  In the cylinder 110, two rotating shafts 131 and 132 that are rotated at the same speed in opposite directions so as to be positioned in parallel are arranged. The two rotors are integrally fixed to each of the two rotating shafts 131 and 132, and have hook-shaped claw portions 139 formed so as to compress the sucked gas that is engaged with each other in a non-contact state. 130 </ b> A and 130 </ b> B are arranged in the cylinder 110.

  Reference numeral 140 denotes an electric motor (see FIG. 6) which is a configuration of the rotation drive device, and transmits power by the rotation shaft 131 and the rotation shaft 132 driven from the rotation shaft 131 through gears 137 and 137. Thus, the two rotors 130A and 130B are provided to be rotationally driven.

Reference numeral 121 denotes an intake port which communicates with a portion of the pump chamber where the gas in the cylinder 110 is not compressed. The intake port 121 is generally provided in the side plate portions 120A and 120B, but may be provided in the side peripheral wall 115 of the cylinder 110.
An exhaust port 122 is a pump chamber in which the gas in the cylinder 110 is compressed in both the one side plate part 120A and the other side plate part 120B so that the compressed gas is discharged from both sides through both end faces of the cylinder 110. The part is open.

Both side plate portions 120 </ b> A and 120 </ b> B are each provided with a peripheral wall portion 125 that continues from the partition wall portion 123 that covers the end surface of the cylinder 110 in the direction opposite to the cylinder 110. The peripheral wall portion 125 and the side peripheral wall 115 of the cylinder 110 are fixed so as to overlap with each other in the extension direction of the shaft, and the peripheral wall portion 125 opens laterally through an exhaust guide chamber 128 that guides compressed gas from the exhaust port 122. An exhaust connection port 129 is provided (see FIG. 4).
As shown in FIG. 6, reference numeral 180 denotes an exhaust connection case, which is connected to two discharge port connection ports 129 and 129 to join compressed air supplied from both sides and connect to an external pneumatic device. It has been. This exhaust connection case 180 is also provided as a muffler chamber.

An intake port 121 is provided in the partition wall portion 123 of both side plate portions 120 </ b> A and 120 </ b> B, and an intake connection port 127 that opens to an intake guide chamber 126 that guides intake gas to the intake port 121 is provided in the peripheral wall portion 125.
In addition, as shown in FIG. 6 , reference numeral 170 denotes an intake connection case, which is connected to two intake connection ports 127 and 127. The intake connection case 170 can collect intake air and is provided as a connection chamber connected to an external pneumatic device.

One bearing portion 135 provided outside the one side plate portion 120A and overlapped with the peripheral wall portion 125 and receiving one end side of the two rotary shafts 131 and 132, and outside the other side plate portion 120B The other bearing portion 136 is provided so as to overlap the peripheral wall portion 125 and receives the other end side of the two rotary shafts 131 and 132.
As described above, the rotors 130A and 130B have both-end support structures and the exhaust ports 122 and 122 are provided on both side surfaces of the pump chamber, so that an optimal exhaust area can be secured and the degree of freedom in design can be greatly improved.

124a and 124b are through holes, and are provided in the partition wall portion 123 so that the rotating shafts 131 and 132 are inserted (see FIG. 4). The bearings 135 and 136 are provided with bearings 134 and support the rotary shafts 131 and 132 (see FIG. 5). Further, an oil seal 161 is disposed on one bearing portion 135 (see FIG. 5).
Reference numeral 133 denotes a cooling vent, and a plurality of the side plate portions 120A and 120B are provided on the peripheral wall portions 125 and 125 so as to communicate with the inside of the side plate portions 120A and 120B.

  Gears 137 and 137 fixed to one end side of the two rotary shafts 131 and 132 are engaged with each other outside the one bearing portion 135 (see FIG. 5), and the two rotary shafts 131 are outside the other bearing portion 136. , 132 is connected to a rotating shaft 141 of an electric motor 140 which is an example of a rotation driving device (see FIG. 6). Reference numeral 150 denotes a coupling that connects the other end side 131 a of one rotating shaft 131 and the rotating shaft 141. Reference numeral 151 denotes a cooling fan, which is fixed to the coupling 150. Reference numeral 160 denotes an oil bath in which lubricating oil for the two gears 137 and 137 is enclosed.

Next, the claw pump shown in FIGS. 7 and 8 will be described below as an example of a control technique.
Reference numeral 210 denotes a cylinder. In the cylinder 210, two rotating shafts 221 and 222 rotated in the opposite direction at the same speed are arranged in parallel. And it is integrally fixed to each of the free end sides held by the cantilever of the two rotating shafts 221 and 222, and has a bowl shape so that the gas sucked can be compressed by engaging with each other in a non-contact state. Two rotors 220 </ b> A and 220 </ b> B formed with claw portions are arranged in the cylinder 210.

  The cylinder 210 includes a peripheral wall portion 212 of the cylinder, one side plate portion 211 that is a portion constituting one end face wall of the cylinder 210, and the other side plate that is a portion constituting the other end face wall of the cylinder 210. A portion 213, a suction port 214 (see FIG. 8) communicating with a portion of the pump chamber where the gas in the cylinder 210 is not compressed, and a portion of the pump chamber where the gas within the cylinder 210 is compressed in one side plate portion 211. And an exhaust port 215 provided to open.

  One end sides of the two rotary shafts 221 and 222 are inserted into a pair of through holes opened across the other side plate portion 213 and the one bearing portion 231 so as to be received by the bearings 234 and 234. Each bearing 234 is attached to a bearing mounting portion provided on one bearing portion 231 by a holding plate 235.

The intake port 214 is provided to be opened in the peripheral wall portion 212 of the cylinder (see FIG. 8). According to this, there is an advantage that the opening can be set sufficiently large and the connection port can be easily formed appropriately.
Note that the opening position of the intake port 214 is not limited to this, and may be provided on one side plate portion 211. That is, the position and shape of the pump chamber are not limited as long as they can communicate with the portion of the pump chamber that is the non-compression chamber.

Reference numeral 230 denotes a gear box, and a pair of gears 237 and 237 that are integrally fixed to the two rotating shafts 221 and 222 in the gear box 230 and are engaged with each other and rotated at the same speed in opposite directions. Is arranged.
The gear box 230 is provided on the side opposite to the cylinder peripheral wall 212 side of the other side plate portion 213, and the gear box peripheral wall 232 including the pair of gears 237 and 237, One bearing portion 231 which is a part constituting one end face wall and receiving two rotating shafts 221 and 222, and a part constituting the other end face wall of the gear box 230 and two rotating shafts 221 , 222, and the other bearing portion 233 that is a portion that receives the second portion 222.

  The other end sides of the two rotary shafts 221 and 222 are inserted into through holes opened in the other bearing portion 233 so as to be received by the bearings 238 and 238. Further, as shown in FIG. 7, oil leakage from the gear box 230 is prevented by an oil seal 236, a lid 239 that closes the through hole, and an O-ring 239a (see FIG. 8).

  A structure integrally constituted by the cylinder 210 and the gear box 230 is divided between the one side plate portion 211 and the peripheral wall portion 212 of the cylinder, and the one bearing portion 231 and the other bearing. By being divided between the portion 233 and the end face wall portion (one side plate portion 211) on the exhaust port side, the intermediate body portion 240, and the gear-side body portion 250, a three-part structure is formed. . The intermediate body portion 240 and the gear-side body portion 250 are divided between one bearing portion 231 and the peripheral wall portion 232 of the gear box.

Reference numeral 260 denotes a rotation drive device (see FIG. 7), which transmits power through the rotation shaft 221 and the rotation shaft 222 driven from the rotation shaft 221 through gears 237 and 237, thereby providing two rotors 220A and 220B. Are driven to rotate.
For example, a rotating shaft of an electric motor that is an example of the rotation driving device 260 can be connected to the end 221a of the rotating shaft 221 outside the other bearing portion 233 via a coupling (see FIG. 7). . The centrifugal fan can be fixed coaxially to the coupling to form an air cooling structure. Further, the rotary drive device 60 is not limited to an electric motor, and other known drive devices can be used.

Reference numeral 252 denotes a bolt. As shown in FIG. 8, a plurality of bolts (six in the example of FIG. 8) are arranged so as to connect the intermediate main body 240 and the gear-side main body 250. The bolt 252 is inserted into a bolt hole 251 provided in the gear-side main body portion 250 and is provided so as to be screwed into a female screw portion provided in the intermediate main body portion 240.
256 is a pin, and as shown in FIG. 8, a plurality of pins (two in the example of FIG. 8) are arranged so as to align the intermediate main body 240 and the gear-side main body 250. The pin 256 can be aligned by being inserted into a pin hole 255 (see FIG. 8) provided in the gear-side main body 250 and a pin hole provided in the intermediate main body 240.

In the biaxial rotary pump including the claw pump described above, higher production accuracy is required so as to secure a minute clearance of a rotating device that rotates with a minute gap for improving performance. In order to increase the production accuracy, it is possible to increase the processing accuracy and make the assembly adjustment and measurement adjustment more precise.
Further, in order to ensure the clearance, it is an indispensable condition how the bearings are arranged and what precision is adopted. However, if a bearing with an excessively narrow gap is employed to ensure the clearance, an excessive load is applied to the bearing due to the influence of heat or rotation, leading to early damage.
In addition, in the claw pump as the above reference technique example, the other side plate portion precisely machined is included with respect to the one main body portion (housing portion) including one side plate portion precisely machined. The other body part (housing part) is structured to be assembled on the basis of parallel pins.

Since the single-shaft structure rotary pump has no influence on the inter-axis distance, there is no problem in position adjustment by fixing the side plate portion. However, in the biaxial structure, when the bearing is fixed directly to the side plate portion, the distance between the axes is affected, and the load is likely to increase on either of the biaxial bearings. According to this, the life of the bearing is shortened, which becomes a factor of increasing the energy consumption.
In addition, even if the processing accuracy of each part is increased in the biaxial rotary pump, the effects of the precision of each part such as pin precision, housing part including the opposite side plate part, bearing, and rotary shaft are combined. receive. Therefore, it is necessary to increase the internal clearance by increasing the internal clearance of the bearing so as not to apply a load to the bearing or to increase the internal clearance of the bearing based on the accuracy obtained by adding all the dimensional tolerances.
Furthermore, when the pin alignment position and the axial dimension of the main body are extended, the mechanical accuracy is deteriorated, and it is necessary to increase the internal clearance and the clearance dimension of the main body.
When the clearance dimension is increased in this manner, leakage of fluid such as air increases, which causes a decrease in pump performance.

On the other hand, as a prior art related to the centering of a rotating shaft having a single-shaft structure, a first bearing attached to one end surface of a motor case and an end lid for closing the opening on the opposite side of the one end surface are used. A small motor that has a motor shaft inserted through an attached second bearing, and has a bearing holder formed by press-fitting the second bearing, and the bearing holder is fitted in the center hole of the end cover. A small motor that can rotate with slip resistance and can be spot-fixed to the end cover at a position where the feed current is minimized by adjusting the rotation of the bearing holder during operation after motor assembly. And the manufacturing method is proposed (refer patent document 1).
According to this, there is an effect that the variation of the sliding loss due to the eccentricity or the inclination posture of the bearing can be reduced and the yield can be improved with respect to the rotating shaft having the uniaxial structure.

JP 2005-117770 A (first page)

The problem to be solved regarding the biaxial rotary pump and its manufacturing method is that many parts are different from the case of the single axial rotary pump, such as when the structure is assembled on the basis of parallel pins as in the control technology example. Tolerance is added and accuracy tends to decrease. According to this, it is necessary to increase the clearance between the rotors or between the rotor and the cylinder inner surface, and the pump performance is reduced.
Therefore, an object of the present invention is to improve the relative centering accuracy of the biaxial shaft centers, and appropriately reduce the clearance between the rotors or between the rotor and the cylinder inner surface to appropriately improve the pump performance. It is in providing a rotary pump and its manufacturing method.

The present invention has the following configuration in order to achieve the above object.
According to an embodiment of the biaxial rotary pump according to the present invention, the two rotors are rotated in a non-contact manner while maintaining a minute clearance, and the two rotors are also maintained in a minute clearance on the inner surface of the cylinder. One housing part having one bearing side wall part for receiving one end side of the two rotating shafts provided with the rotor so as to be rotated in contact with each other, and the one receiving the other end side of the two rotating shafts And the other housing portion having the other bearing side wall portion provided as a separate part, so as to rotate from one rotating shaft to the other rotating shaft in the opposite direction at the same speed by a pair of gears. In the biaxial rotary pump for transmitting power, the one bearing side wall is provided as a wall on one end opposite to the side fixed to the other housing, and the other Housing part, said other bearing side wall, the side wall portion that forms the cylinder is constructed by integrally molded, the bearing side wall of the one is, each bearing for receiving the one end of the rotary shafts Each bearing holder portion is configured to be divided into a base portion of the bearing side wall portion, and each bearing holder portion is in a plane perpendicular to the two rotation axes with respect to the base portion of the bearing side wall portion. In order to be able to fix the position within a predetermined range, the base portion of the bearing side wall portion is fitted into each step portion formed by being dug larger than the bearing holder portion.

Moreover, according to one form of the biaxial rotary pump concerning this invention, it was between the one bearing side wall part and the other bearing side wall part, and was provided by the said side peripheral wall part of the said other housing part. The two rotors are arranged in a cylinder, and the pair of gears for transmitting power is arranged on the outer side of the other bearing side wall portion opposite to the one housing portion side. It can be.
Further, according to one aspect of the biaxial rotary pump according to the present invention, the pair of gears for transmitting power is arranged between the one bearing side wall and the other bearing side wall, and the other bearing The two rotors are disposed in the cylinder provided by the side peripheral wall portion of the other housing portion on the side opposite to the one housing portion side of the side wall portion. Can do.

  Further, according to one embodiment 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 so as not to contact 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 method for manufacturing the biaxial rotary pump according to the present invention, the two rotors are rotated in a non-contact manner while maintaining a minute clearance, and the two rotors are also minutely formed on the inner surface of the cylinder. One housing part having one bearing side wall part for receiving one end side of two rotating shafts each provided with the rotor so as to be rotated in a non-contact manner while maintaining a clearance, and the other end of the two rotating shafts And the other housing part having the other bearing side wall provided as a separate part from the one housing part receiving the side, and the same speed in the opposite direction by a pair of gears from one rotating shaft to the other rotating shaft The one side wall is provided as a wall on one end opposite to the side fixed to the other housing, and the other housing is provided. Grayed section, said other bearing side wall, the side wall portion that forms the cylinder is constructed by integrally molded, the bearing side wall of the one is, each bearing for receiving the one end of the rotary shafts Each bearing holder portion is configured to be divided into a base portion of the bearing side wall portion, and each bearing holder portion is in a plane perpendicular to the two rotation axes with respect to the base portion of the bearing side wall portion. A biaxial rotary pump fitted in each step portion formed by being dug larger than each bearing holder portion in the base portion of the bearing side wall so that the position can be adjusted within a predetermined range of The two bearing holder portions and the base portion of the bearing side wall are assembled so as to be position-adjustable, and the one rotation is transmitted by transmitting a driving force to the one rotating shaft. The rotated the other rotary shaft simultaneously securing the two bearing holder portion in a state in which a positional relationship that they are properly rotated in the base portion of the bearing side wall and.
Moreover, according to one form of the manufacturing method of the biaxial rotary pump concerning this invention, rotation prescribed | regulated by making the end surface of the said rotor contact | abut to the inner end surface of the said cylinder provided in the said other housing part. It can be characterized by assembling on the basis of the axis of the shaft.

  According to the biaxial rotary pump and the manufacturing method thereof according to the present invention, the relative centering accuracy of the biaxial shaft centers is improved, and the clearance between the rotors and between the rotor and the cylinder inner surface is appropriately reduced. As a result, the pump performance can be improved.

It is sectional drawing which shows the example of a form of the biaxial rotary pump which concerns on this invention. It is a perspective view of the pump unit with which the example of FIG. 1 was mounted | worn. It is sectional drawing which shows the other example of a biaxial rotary pump which concerns on this invention. It is a disassembled perspective view which shows the example of a contrast technique of a biaxial rotary pump. FIG. 5 is a cross-sectional view of the control technique example of FIG. 4. It is a top view of the pump unit with which the control technique example of FIG. 4 was mounted | worn. It is sectional drawing which shows the other contrast technique example of a biaxial rotary pump. FIG. 8 is an exploded perspective view of the control technique example of FIG. 7.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a best mode example of a biaxial rotary pump and a manufacturing method thereof according to the present invention will be described in detail with reference to the accompanying drawings (FIGS. 1 to 3).
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.

  The embodiment of the biaxial rotary pump shown in FIG. 1 supports the rotary shafts 31 and 32 provided with the rotors 30A and 30B on both sides of the rotors 30A and 30B. On the other hand, in the embodiment of the biaxial rotary pump shown in FIG. 3, the rotary shafts 71 and 72 provided with the rotors 70A and 70B are supported on one side of the rotors 70A and 70B.

Each of the biaxial rotary pumps shown in FIGS. 1 and 3 has the following configuration. In addition to the code | symbol of the form example of FIG. 1, the code | symbol of the form example of FIG.
In any of the biaxial rotary pumps, the two rotors 30A and 30B (70A and 70B) are rotated in a non-contact manner while maintaining a minute clearance, and the two rotors 30A and 30B (70A and 70B) are rotated by the cylinder 25 (65 ) On one end side of the two rotary shafts 31 and 32 (71 and 72) provided with the rotors 30A and 30B (70A and 70B) respectively so that the inner surface of the rotor 30A and 30B can be rotated in a non-contact manner. One housing part 10 (50) having one bearing side wall part 11 (51) to be received and one housing part 10 (50) receiving the other end side of the two rotary shafts 31, 32 (71, 72) And the other housing portion 20 (60) having the other bearing side wall portion 21 (61) provided as a separate part, from one rotating shaft 31 (71) to the other rotating shaft 32 (72). It is provided so as to rotate at the same speed in opposite directions by a pair of gears 33, 33 (73, 73).

  And one bearing side wall part 11 (51) which is a bearing side wall part by which the motive power is input receives each bearing 15a, 15b (55a, 55b) which receives the one end side of each rotating shaft 31, 32 (71, 72). ) Are divided into two bearing holder portions 18a and 18b (58a and 58b) fixed to the base portion 11a (51a) of the bearing side wall, and two bearing holder portions 18a and 18b (58a and 58b) are formed. ) Is fixed to the base portion 11a (51a) of the bearing side wall portion by a mounting structure whose position can be adjusted in a plane orthogonal to the two rotation shafts 31, 32 (71, 72).

  In the mounting structure of these embodiment examples, the bearing holder portion 18a, the bearing holder portions 18a, 18b (58a, 58b) are fitted to one bearing side wall portion 11 (51) so that the position of the bearing holder portions 18a, 18b (58a, 58b) can be adjusted within a predetermined range. A step portion formed by being dug larger than 18b (58a, 58b) is formed. Further, as means for fixing the bearing holder portions 18a and 18b (58a and 58b) to the base portion 11a (51a) of the bearing side wall portion, a fastening bolt 19 (not shown in FIG. 3) is used.

Further, in any of the embodiments shown in FIGS. 1 and 3, a cylinder 25 (65) that forms a pump chamber having a cross-sectional shape in which a part of two circles are overlapped, and the cylinder 25 (65) The claw pump is provided with two rotors 30A and 30B (70A and 70B) each having a hook-shaped claw portion formed so as to compress the gas sucked by being in contact with each other in a non-contact state.
Note that the structure of the claw pump has already been described based on FIGS. 4 to 8 as an example of the control technique in the background art column, and thus the description thereof is omitted here.
Moreover, this invention is applicable not only to such a claw pump but other biaxial rotary pumps, such as a Roots pump and a screw pump, for example.

In the embodiment shown in FIG. 1, two rotors 30 </ b> A and 30 </ b> B are arranged between the bearing side wall portions 11 and 21, and a pair of gears 33 and 33 that transmit power are arranged outside the other bearing side wall portion 21. Has been.
According to this, the configuration of the present invention can be suitably applied to a claw pump that exhausts air from the side walls at both ends of the cylinder 25.

Further, the embodiment shown in FIG. 1 has the following configuration.
One housing part 10 is formed by integrally molding one bearing side wall part 11, side peripheral wall part 12 and one end wall part 13 of the cylinder, and a portion surrounded by these wall parts is It is a space 16 for intake and exhaust passages.
The other housing part 20 is formed by integrally molding the other bearing side wall part 21, the side peripheral wall part 22, and the other end wall part 23 of the cylinder, and the part surrounded by these wall parts is It is a space 26 for intake and exhaust passages.
One housing part 10 is fixed to the other housing part 20 by fastening bolts 29.

The cylinder 25 is surrounded by one end wall portion 13 of the cylinder provided on the other end side of the one housing portion 10, the side peripheral wall portion 22 of the other housing portion 20, and the other end wall portion 23 of the cylinder. Is formed.
The inner end surface 23a of the cylinder serves as a reference surface for centering the rotary shafts 31 and 32 by bringing the end surfaces of the rotors 30A and 30B into contact with each other during assembly.

Two bearings 24 a and 24 b are fixed to the other bearing side wall 21, and the other end side of one rotating shaft 31 is supported by the bearing 24 a, and the other end side of the other rotating shaft 32 is supported by the bearing 24 b. ing.
Reference numeral 28 denotes an oil seal that seals oil from leaking from the gear chamber 45 formed by the oil bath 40.
Reference numeral 31a denotes a connecting portion of the rotating shaft 31, and extends so as to be connected to a rotating shaft on the driving source side such as an electric motor 47 (see FIG. 2) via a coupling 46.
FIG. 2 illustrates a pump unit including a biaxial rotary pump having the above configuration, and an electric motor 47 is fixed by a motor joint 48. Reference numeral 41 denotes an intake case, which branches into and communicates with intake ports formed at both ends of the cylinder 25. Reference numeral 42 denotes an exhaust case, which also functions as a muffler.

In the embodiment shown in FIG. 3, a pair of gears 73 and 73 that transmit power are arranged between the bearing side wall portions 51 and 61, and two rotors 70 </ b> A and 70 </ b> B are arranged outside the other bearing side wall portion 61. Has been.
According to this, the configuration of the present invention can be suitably applied to a claw pump that exhausts air from one side wall of the cylinder 25.

Further, the embodiment shown in FIG. 3 has the following configuration.
One housing part 50 is formed by integrally molding one bearing side wall part 51 and side peripheral wall part 52.
The other housing part 60 is configured by integrally molding the other bearing side wall part 61 and the side peripheral wall part 62.
One housing part 50 is fixed to the other housing part 60 by fastening bolts 69.

A portion surrounded by the one bearing side wall 51, the side peripheral wall 52, and the other bearing side wall 61 is a gear chamber 56, in which a pair of gears 73 and 73 are accommodated.
The other bearing side wall 61 serves as one end wall of the cylinder, and a cylinder 65 is formed by being surrounded by the other bearing side wall 61, the side peripheral wall 62, and the side plate 80.
The inner end surface 63 of the cylinder serves as a reference surface for centering the rotary shafts 71 and 72 by bringing the end surfaces of the rotors 70A and 70B into contact with each other during assembly.

Two bearings 64a and 64b are fixed to the other bearing side wall 61. The other end side of one rotating shaft 71 is supported by the bearing 64a, and the other end side of the other rotating shaft 72 is supported by the bearing 64b. ing.
Reference numeral 68 denotes an oil seal that seals the oil chamber 56 so that oil does not leak.
Reference numeral 71a denotes a connecting portion of the rotating shaft 71, and extends so as to be connected to a rotating shaft on the driving source side such as an electric motor through a coupling.

Next, the manufacturing method of the biaxial rotary pump provided with the above structure is demonstrated below.
1 and FIG. 3, both the two-shaft rotary pumps are assembled so that the positions of the two bearing holder portions 18a, 18b (58a, 58b) and the base portion 11a (51a) of the bearing side wall portion can be adjusted. When the driving force is transmitted to the rotating shaft 31 (71) of the first rotating shaft 31 (71) and the rotating shaft 32 (72) of the other rotating at the same time, the two are properly positioned. The two bearing holder portions 18a and 18b (58a and 58b) are fixed to the base portion 11a (51a) of the bearing side wall.
By assembling in this way, the two rotating shafts 31 and 32 (71 and 72) can be properly centered.

  Further, a rotation shaft defined by bringing the end faces of the rotors 30A, 30B (70A, 70B) into contact with the inner end face 23a (63) of the cylinder 25 (65) provided in the other housing portion 20 (60). By assembling on the basis of the axial center of 31 and 32 (71, 72), it can assemble appropriately on the basis of the rotating shaft 31, 32 (71, 72).

Furthermore, an assembly procedure will be described.
The rotating shafts 31, 32 (71, 72) are inserted into the bearings 24a, 24b (64a, 64b) on one side (the other end side), and the respective parts are assembled. At this time, the clearance of each part is adjusted with reference to the end surfaces of the rotors 30A and 30B (70A and 70B) and the inner end surface 23a (63) of the cylinder.
Then, when the bearings 15a and 15b (55a and 55b) on the opposite side are attached, the bearing holder portions 18a and 18b (58a and 58b) are set in a free state in which the position can be adjusted.
By rotating the rotating shaft 31 (71) in this state, the rotating shaft 32 (72) is driven to rotate. By rotating the rotary shafts 31 and 32 (71 and 72) in this way, the bearings 15a and 15b (55a and 55b) are automatically set in a state where both the rotary shafts 31 and 32 (71 and 72) can smoothly rotate. The centering operation is automatically performed.
Accordingly, the bearings 15a and 15b (55a and 55b) can be appropriately positioned on the basis of the shaft (the rotary shafts 31 and 32 (71 and 72)), and in this state, the bearing holder portions 18a and 18b (58a and 58b). ) Is fixed to the base portion 11a (51a) of the bearing side wall portion with the shaft as a reference.

According to the present invention, the relative centering accuracy of the two shaft centers can be improved, and therefore the clearance between the rotors or between the rotor and the cylinder inner surface can be appropriately reduced, resulting in pump performance. Can be improved.
And since a bearing can be arrange | positioned on the basis of a shaft (rotation axis), it becomes difficult to apply an unbalanced load to a bearing, and the lifetime can be extended.
In addition, when a clearance equivalent to the assembly based on the pin standard is secured, the effect on the clearance is small even if the bearing load distribution is away from the action point, so that the performance can be improved.
Furthermore, it is not necessary to use a pin as described in the control technique example, and it is not necessary to ensure the accuracy of the pin, and the precision processing is not necessary, so that the manufacturing efficiency can be improved and the cost can be reduced.

  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 Side peripheral wall part 13 One end wall part of a cylinder 15a Bearing 15b Bearing 18a Bearing holder part 18b Bearing holder part 20 The other housing part 21 The other housing part 21 Bearing side wall portion 22 Side peripheral wall portion 23 Other end wall portion of the cylinder 23a Inner end surface of the cylinder 24a Bearing 24b Bearing 25 Cylinder 30A Rotor 30B Rotor 31 Rotating shaft 32 Rotating shaft 33 Gear 40 Oil bath 45 Gear chamber 50 One housing portion 51 One bearing side wall portion 51a Base portion of bearing side wall portion 52 Side peripheral wall portion 55a Bearing 55b Bearing 56 Gear chamber 58a Bearing holder portion 58b Bearing holder portion 60 The other housing portion 61 Square inner end face 64a bearing 64b bearing 65 cylinders 70A rotor 70B rotor 71 rotates shaft 72 rotary shaft 73 gear bearing sidewall portion 62 side wall portion 63 cylinder

Claims (6)

The rotors are respectively provided such that the two rotors are rotated in a non-contact manner with a minute clearance and the two rotors are also rotated in a non-contact manner with a minute clearance on the inner surface of the cylinder. One housing portion having one bearing side wall portion that receives one end side of the two rotating shafts, and the other bearing side wall provided as a separate part from the one housing portion receiving the other end side of the two rotating shafts A biaxial rotary pump that transmits power so as to rotate at the same speed in the opposite direction by a pair of gears from one rotary shaft to the other rotary shaft,
The one bearing sidewall portions to the side that is fixed to the housing portion of the other is provided as a wall portion at the opposite end side, said other housing part, said other bearing side wall portion to form said cylinder The side peripheral wall portion is integrally formed, and the one bearing side wall portion includes a bearing holder portion to which each bearing that receives one end side of each rotating shaft is fixed, and a base portion of the bearing side wall portion. The bearing side wall is configured to be divided and fixed to the base portion of the bearing side wall portion so as to be adjustable in a predetermined range within a plane orthogonal to the two rotation axes. A biaxial rotary pump characterized in that it is fitted in each step portion formed by being dug into the base portion of the portion larger than each bearing holder portion. The two rotors are arranged in the cylinder provided by the side peripheral wall portion of the other housing portion between the one bearing side wall portion and the other bearing side wall portion, and the other bearing side wall. 2. The biaxial rotary pump according to claim 1, wherein the pair of gears for transmitting power is arranged on an outer side of the portion opposite to the one housing portion side . The pair of gears for transmitting power is arranged between the one bearing side wall and the other bearing side wall, and is opposite to the one housing part side of the other bearing side wall, The two-shaft rotary pump according to claim 1, wherein the two rotors are arranged in the cylinder provided by the side peripheral wall portion of the other housing portion .   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, 2 or 3, wherein the pump is a claw pump comprising the two rotors formed with a portion. The rotors are respectively provided such that the two rotors are rotated in a non-contact manner with a minute clearance and the two rotors are also rotated in a non-contact manner with a minute clearance on the inner surface of the cylinder. One housing portion having one bearing side wall portion that receives one end side of the two rotating shafts, and the other bearing side wall provided as a separate part from the one housing portion receiving the other end side of the two rotating shafts The other housing part, and transmits power from one rotary shaft to the other rotary shaft so as to rotate at the same speed in the opposite direction by a pair of gears. the side to be fixed to the housing portion is provided as a wall portion at the opposite end side, said other housing part, said other bearing side wall, the side wall forming the cylinder It is constituted by integrally molded, the bearing side wall of the one is, and the bearing holder portion each bearing is fixed to receive one end of each rotary shaft, is divided into a base portion of the bearing side wall portion The base of the bearing side wall is configured such that each bearing holder part can be fixed to the base part of the bearing side wall so that the position can be adjusted within a predetermined range in a plane perpendicular to the two rotation axes. About the biaxial rotary pump fitted in each step formed by digging one size larger than each bearing holder part in the part,
The two bearing holder parts and the base part of the bearing side wall are assembled so as to be position-adjustable, and by transmitting a driving force to the one rotating shaft, the one rotating shaft and the other rotating shaft are simultaneously connected. A method for manufacturing a biaxial rotary pump, wherein the two bearing holder portions are fixed to a base portion of the bearing side wall portion in a state in which the two bearing holder portions are rotated and properly positioned.   6. The assembly according to claim 5, wherein assembly is performed on the basis of an axis of a rotating shaft defined by bringing an end face of the rotor into contact with an inner end face of the cylinder provided in the other housing portion. Manufacturing method of shaft rotary pump.

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