CN214366626U

CN214366626U - Fluid compression device

Info

Publication number: CN214366626U
Application number: CN202120363862.6U
Authority: CN
Inventors: M·雷帕奇
Original assignee: Mgf LLC
Current assignee: Mgf LLC
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2021-10-08
Anticipated expiration: 2031-02-08

Abstract

The utility model provides a fluid compression device. The fluid compression device comprises a power source capable of generating driving torque and a plurality of compression assemblies arranged in a shell, wherein each compression assembly is in transmission connection with the power source, so that the plurality of compression assemblies work to compress fluid under the action of the driving torque generated by the power source. The fluid compression device further comprises an axial flow fan, wherein the axial flow fan and the power source are located on two axial sides of the shell, and the axial flow fan enables airflow to flow through the shell and the power source from one axial side to the other axial side along the axial direction. Because this axial fan's fan efficiency is high and compact structure, utilize this axial fan to cool off effectively to fluid compression device's casing and power supply, make according to the utility model discloses a fluid compression device can continuous operation, and need not worry each part in the course of the work and break down because overheated.

Description

Fluid compression device

Technical Field

The present invention relates to the field of pressurizing a fluid such as air, and more particularly to a fluid compression device.

Background

Positive displacement compressors, also known as dry compressors, which do not require auxiliary lubrication are known. Such compressors generally comprise at least one compression assembly provided with at least one cylinder and a piston capable of reciprocating inside the cylinder. The reciprocating motion of the piston within the cylinder effects the suction, compression and delivery of a working fluid (e.g., air). During the operation of the compressor, not only a large amount of heat is generated during the above-described compression process, but also a large amount of heat is generated due to friction occurring between moving members and the operation of a power source (e.g., a motor).

In order to avoid undesirable malfunctioning of the compressor due to the heat generated during its operation, it is known to use at least one radial fan driven in rotation by the aforementioned power source, which is adapted to generate a cooling air flow. But the cooling of the compressor by the radial compression fan cannot provide enough cooling performance so that the duty ratio of the duty cycle of the compressor (defined as on-time/(on-time + off-time)) reaches 70% or more in the duty cycle in which the compressor is first compressed to achieve zero to maximum pressure or in the duty cycle in which the compressor is compressed again to achieve minimum to maximum pressure. In other existing compressors, fan systems are utilized that include radial and axial fans, but such fan systems are relatively large in axial size and relatively costly (requiring additional fans and their respective motors to be assembled to the main shaft).

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above-mentioned drawbacks of the prior art. An object of the utility model is to provide a fluid compression device, it can improve the cooling performance of compression assembly under the condition of the whole axial dimensions of not increase device.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme.

The utility model provides a following fluid compression device, fluid compression device includes:

a power source configured to generate a drive torque;

a housing formed with a receiving space therein and having an axial direction, a radial direction, and a circumferential direction;

a plurality of compression assemblies received within the receiving space and distributed along the circumferential direction, each compression assembly being drivingly coupled to the power source such that the plurality of compression assemblies operate to compress a fluid under the action of a drive torque generated by the power source; and

the axial flow fan and the power source are located on two axial sides of the shell, and the axial flow fan enables airflow to flow through the shell and the power source from one axial side to the other axial side along the axial direction.

Preferably, the power source has an output shaft extending through the housing in the axial direction, the output shaft being coupled to the axial fan in a rotationally fixed manner such that the power source can drive the axial fan; or

The fluid compression device further includes an additional power source independent of the power source, the additional power source being drivingly coupled to the axial fan such that the additional power source is capable of driving the axial fan.

More preferably, the fluid compression device further includes a shield assembly secured to the housing, the shield assembly surrounding and spaced apart from the axial fan.

More preferably, the guard assembly includes two grids and an annular portion, the two grids are respectively located at two axial side ends of the annular portion, the two grids are both fixed with the annular portion,

the two grills are positioned on two axial sides of the axial flow fan, and the annular part is positioned on the outer peripheral side of the axial flow fan, so that the two grills and the annular part surround the axial flow fan.

More preferably, the guard assembly further includes a plurality of flow guide plates fixed to the annular portion, each of the flow guide plates is formed in an arc plate shape extending along the circumferential direction, and each of the flow guide plates extends from an axial other-side end edge of the annular portion toward an axial other side while extending obliquely toward a radial inner side.

More preferably, the casing is formed with a plurality of protrusions distributed along the circumferential direction, each of the compression assemblies pressurizes the fluid in the protrusion, and the plurality of flow guide plates and the plurality of protrusions are alternately distributed in the circumferential direction in a staggered manner.

More preferably, the fluid compression device further includes a plurality of connecting members, each of the connecting members including a radial portion extending in the radial direction and an axial portion extending in the axial direction, the radial portion being fixed to the housing, and the axial portion being fixed to the shield assembly such that the shield assembly is fixed to the housing.

More preferably, the housing includes a housing main body and two flanges located at both axial ends of the housing main body, the two flanges being fixed to the housing main body such that the two flanges and the housing main body surround to form the housing space, and a central through hole through which an output shaft of the power source passes is formed in the center of the two flanges.

More preferably, the flange includes a central cylindrical portion and a flange portion extending radially outward from the central cylindrical portion, and a plurality of ribs are formed on both axial side surfaces of the flange portion, each of the ribs extending in the radial direction, and the plurality of ribs are radially distributed on both axial side surfaces.

More preferably, the fluid compression device further includes a bearing provided at the central through hole of the flange, the bearing being provided between the flange and the output shaft of the power source such that the output shaft is supported by the bearing in a rotatable manner with respect to the flange.

By adopting the technical scheme, the utility model provides a novel fluid compression device. The fluid compression device comprises a power source capable of generating driving torque and a plurality of compression assemblies arranged in a shell, wherein each compression assembly is in transmission connection with the power source, so that the plurality of compression assemblies work to compress fluid under the action of the driving torque generated by the power source. The fluid compression device further comprises an axial flow fan, wherein the axial flow fan and the power source are located on two axial sides of the shell, and the axial flow fan enables airflow to flow through the shell and the power source from one axial side to the other axial side along the axial direction.

Since the axial flow fan has a high fan efficiency and a compact structure, the axial flow fan effectively cools the casing and the power source of the fluid compression device, particularly reduces the temperatures of the rotating member and the sealing member, and also reduces the temperature of the stationary member that is overheated due to heat conduction. Furthermore, according to the present invention, the duty ratio of the duty cycle of the fluid compression device is effectively improved. In particular, compared to the situation where the duty cycle of the working cycle of the existing compressor is only able to reach 70% at the highest, the duty cycle of the working cycle of the fluid compression device according to the present invention can be increased to 100%. That is, the fluid compression device according to the present invention can be continuously operated without worrying about the malfunction of each component due to overheating during operation.

Drawings

Fig. 1A is a schematic perspective view showing a fluid compression device according to a first embodiment of the present invention.

Fig. 1B is an exploded schematic view illustrating the fluid compression device in fig. 1A.

Fig. 1C is a partially cross-sectional schematic view illustrating the fluid compression device of fig. 1A.

Fig. 2A is a schematic front view illustrating a flange of the fluid compression device in fig. 1A.

Fig. 2B is a side view schematic diagram illustrating a flange of the fluid compression device of fig. 1A.

Fig. 2C is a schematic rear view illustrating a flange of the fluid compression device in fig. 1A.

Fig. 3A is a schematic sectional view showing an axial flow fan of a fluid compression device according to a second embodiment of the present invention.

Fig. 3B is an exploded view schematically showing a shield assembly of a fluid compression apparatus according to a second embodiment of the present invention.

Description of the reference numerals

1 motor 11 motor casing 12 output shaft

2 case 21 case body 21p projecting portion 22 flange 22h central through hole 221 central cylindrical portion 222 flange 223 first rib 224 second rib

3 compression assembly 31 piston 32 bearing rod

4. 4 'axial fan 41 core 42, 42' blade 43 spindle 44 mounting

5. 5 'protective component 51, 51' first grid 52, 52 'annular portion 52p flow guide plate 53, 53' second grid

6 radial part 62 axial part of connecting piece 61

7 conveying assembly 71 conduit 72 quick-release quick-assembly joint 73 cover part

The bearing A is in the axial direction R and the radial direction C.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the invention, and is not intended to exhaust all possible ways of practicing the invention, nor is it intended to limit the scope of the invention.

In the present invention, "drive coupling" means a direct connection between two components or an indirect connection via a transmission mechanism, so that a driving torque can be transmitted between the two components.

In the present invention, "axial direction", "radial direction" and "circumferential direction" refer to the axial direction, radial direction and circumferential direction of the casing (casing main body) of the fluid compression device, respectively, unless otherwise specified; "one axial side" means the left side in fig. 1B and 1C, "the other axial side" means the right side in fig. 1B and 1C, "the radially outer side" means the side away from the center axis of the housing in the radial direction, and "the radially inner side" means the side close to the center axis of the housing in the radial direction.

The structure of a fluid compression device according to a first embodiment of the present invention will be first described below with reference to the drawings attached to the specification.

(Structure of fluid compression device according to first embodiment of the present invention)

As shown in fig. 1A to 1C, a fluid compression device according to a first embodiment of the present invention includes a motor 1, a housing 2, three compression assemblies 3, an axial fan 4, a shield assembly 5, and four connection members 6 assembled together, and is capable of introducing external air into the housing 2 and pressurizing the air through the compression assemblies 3 to obtain high-pressure air and introduce the high-pressure air into a predetermined container.

In the present embodiment, the motor 1 can generate a driving torque. The motor 1 includes a motor housing 11, a stator, a rotor, and an output shaft 12. The motor housing 11 is fixed to the housing 2. Both the stator and the rotor are housed in a motor housing 11, and the rotor is rotatable relative to the stator to generate a driving torque. The output shaft 12 is coupled to the rotor in a rotationally fixed manner, so that the drive torque from the rotor can be output to the outside of the electric machine 1 via the output shaft 12. The output shaft 12 is disposed coaxially with the housing 2. An output shaft 12 extends through the casing 2 in the axial direction a and to a position where the axial fan 4 is located, the output shaft 12 being coupled in a rotationally fixed manner with the axial fan 4, so that the electric motor 1 is able to drive the axial fan 4 while driving the compression assembly 3 in operation.

In the present embodiment, a housing space is formed inside the casing 2, and the three compression elements 3 and a part of the output shaft 12 are located in the housing space. Specifically, the housing 2 includes a housing main body 21 and two flanges 22 located at both axial ends of the housing main body 21.

The housing body 21 is located on one axial side of the motor 1, and is fixedly coupled to the motor housing 11 in a coaxial manner. The case main body 21 has a substantially cylindrical shape, and the case main body 21 is formed with three convex portions 21p that protrude toward the radial outside, the three convex portions 21p being evenly distributed in the circumferential direction C. Each of the projecting portions 21p is formed as a cylinder in which a piston 31 of the compression assembly 3 moves, and the piston 31 is capable of reciprocating inside the projecting portion 21p by the driving torque of the output shaft 12.

The two flanges 22 are fixed together with the housing main body 21 by, for example, interference fit so as to surround and form the above-described housing space. As shown in fig. 2A to 2C, each flange 22 has a circular ring shape, and a central through hole 22h through which the output shaft 12 of the motor 1 passes is formed in the center of each flange 22. Further, the flange 22 includes a central cylindrical portion 221 and a flange portion 222 extending radially outward from the central cylindrical portion 221, the central cylindrical portion 221 extending a predetermined length in the axial direction a, the flange portion 222 extending radially outward from the central cylindrical portion 221. The flange 22 further includes eight first ribs 223 formed at one side surface of the flange portion 222 and sixteen second ribs 224 formed at the other side surface of the flange portion 222. Each of the first ribs 223 extends from the central cylinder portion 221 to the outer peripheral portion of the flange portion 222 in the radial direction R and the first ribs 223 are evenly distributed in the circumferential direction C, so that the plurality of first ribs 223 form a radial layout on one side surface of the flange portion 222. The second ribs 224 extend from the central cylindrical portion 221 to the outer peripheral portion of the flange portion 222 in the radial direction R and the second ribs 224 are evenly distributed in the circumferential direction C, respectively, so that the plurality of second ribs 224 form a radial layout on the other side surface of the flange portion 222. In the present embodiment, the side surfaces of the two flanges 22 on which the second ribs 224 are formed are opposed to each other in the axial direction a.

In addition, a bearing B for supporting the output shaft 12 is provided between the two flanges 22 and the output shaft 12. Due to the arrangement of the first rib 223 and the second rib 224, the material used for molding the two flanges 22 is increased, and the structural strength of the flange 22 serving as a bearing seat in a pressed area is improved. Moreover, by changing the machining error of the central through hole 22h of the flange 22, a good interference fit between the flange 22 serving as a bearing seat and the outer ring of the bearing B can be achieved, and the interference between the flange 22 and the outer ring of the bearing B can be improved. In addition, the bearing B may be inserted into the central through hole 22h of the flange 22 by performing a necessary heat treatment (preferably, with open flame). With the above-described configuration, even if the flange 22 serving as a bearing seat thermally expands during operation of the fluid compression device, interference between the outer race of the bearing B and the flange 22 can be ensured, and the same object can be achieved in other manners.

In the present embodiment, three compression assemblies 3 are accommodated in the casing 2 and uniformly distributed along the circumferential direction C, and each compression assembly 3 is in transmission connection with the motor 1, so that the plurality of compression assemblies 3 operate to suck air from the outside of the casing 2 into the bulge portion 21p, further compress the air, and then convey the pressurized air out of the bulge portion 21p under the action of the driving torque generated by the motor 1.

Specifically, each compression assembly 3 includes a piston 31 and a bearing rod 32. One end of the bearing pull rod 32 is mounted on the output shaft 12, the other end of the bearing pull rod 32 is mounted on the piston 31, the piston 31 is located in the protruding portion 21p in a sealing mode with the inner side wall of the protruding portion 21p, therefore, when the output shaft 12 rotates, the output shaft 12 drives the bearing pull rod 32 to move, the bearing pull rod 32 can drive the piston 31 to reciprocate in the protruding portion 21p, and therefore the working processes of air suction, compressed air and air conveying are achieved.

In this embodiment, the axial flow fan 4 and the motor 1 are located at two axial sides of the housing 2, the axial flow fan 4 is located at one axial side of the housing 2, the motor 1 is located at the other axial side of the housing 2, and the axial flow fan 4 enables airflow to flow through the housing 2 and the motor 1 from the one axial side to the other axial side along the axial direction a, so that cooling of components in the housing 2 and the motor 1 is realized.

Specifically, the axial flow fan 4 includes a core 41, blades 42, a spindle 43, and a mount 44. The core 41 is located at a central portion of the axial flow fan 4 for supporting the blades 42. The core 41 is drivingly coupled to the output shaft 12 in cooperation with the spindle 43 and the mounting 44. In the present embodiment, the number of the blades 42 is 11, each blade 42 extends radially outward from the core 41 in a predetermined curved shape, and all the blades 42 are uniformly distributed in the circumferential direction C. One axial end of the spindle 43 is fixed to the core 41 via a mounting member 44, and the other axial end of the spindle 43 is fixedly connected to the output shaft 12 by, for example, a coupling. In this way, the output shaft 12 is drivingly coupled to the axial fan 4.

Compared with the existing radial fan for the fluid compression device, the axial flow fan 4 has a larger diameter and a smaller axial size, and the axial flow fan 4 can generate axial suction airflow and axial output airflow and can improve the cooling effect on the fluid compression device. Each blade 42 has a particular angle of attack, angle of exit and camber so as to allow for a compromise between air pressure and velocity in the generated airflow to maximise the cooling effect of the fluid compression device.

In the present embodiment, the protection component 5 is fixed to the casing 2, and the protection component 5 integrally surrounds the axial flow fan 4 and is spaced apart from the axial flow fan 4, so as to prevent an operator or other objects from touching the axial flow fan 4 in work, so as to protect the operator and prevent the axial flow fan 4 from being damaged.

Specifically, the shield assembly 5 includes a first grill 51, a second grill 53, and a ring portion 52. The first grill 51 is located at one axial side end of the annular portion 52 and is formed integrally with the annular portion 52, and the second grill 53 is located at the other axial side end of the annular portion 52 and is fixedly attached to the annular portion 52 and the first grill 51 by a fixing member such as a bolt. In this way, when the shield assembly 5 is fixedly mounted to the casing 2 by the four connectors 6 and is mounted in place, the two

grills

51 and 52 are located at both axial sides of the axial flow fan 4, and the annular portion 52 is located at the outer circumferential side of the axial flow fan 4, so that the two

grills

51 and 52 and the annular portion 52 surround the axial flow fan 4.

In this embodiment, four connectors 6 are used to fixedly connect the shielding assembly 5 and the housing 2 together. Each of the connecting members 6 includes a radial portion 61 and an axial portion 62 formed integrally, the radial portion 61 extending in the radial direction R, the axial portion 62 extending in the axial direction a, and the axial portion 62 extending from a radially inner end of the radial portion 61 toward one axial side. The radial outer end of the radial portion 61 is fixed to the housing 2, and one axial end of the axial portion 62 is fixed to the second grid 62, so as to achieve the fixed connection of the housing 2 and the shielding assembly 5.

In the present embodiment, the transport unit 7 is used to transport the air pressurized by the compression unit 3 in the projection 21p to a predetermined container. Specifically, the delivery assembly 7 includes a plurality of conduits 71 (e.g., teflon coated hoses that are externally wrapped with stainless steel, which also employs stainless steel attachment structures at both ends), three quick release quick disconnects 72, and three cover portions 73. The three quick release quick-mounts 72 include a two-way and two-way, the cover portions 73 are used for closing the openings formed by the projections 21p and communicated with the outside, and the input ends of the three quick-release quick-mounts 72 are communicated with the inside of the corresponding projections 21p through the cover portions 73. Conduits 71 are connected between the two-way and one-way and between one-way and the other-way. Also connected to the output end of the other tee is a conduit 71, which conduit 71 communicates with a predetermined container, so that pressurized air from within the three projections 21p can be delivered into the container via the delivery assembly 7. In this way, since the conveying assembly 7 adopts the above structure, the conveying assembly 7 is easy to perform maintenance and replacement work, and the conveying assembly 7 can normally work in a high-temperature environment and has corrosion resistance.

The following describes a structure of a fluid compression device according to a second embodiment of the present invention.

(Structure of fluid compression device according to second embodiment of the present invention)

The structure of the fluid compression device according to the second embodiment of the present invention is substantially the same as the structure of the fluid compression device according to the first embodiment of the present invention. The following mainly explains the difference between the two.

In the present embodiment, the shape of the blades 42 'of the axial flow fan 4' is slightly different from the shape of the blades 42 of the axial flow fan 4 of the fluid compression device according to the first embodiment, but the same cooling effect can be produced. Also, in contrast, in the present embodiment, the axial flow fan 4' has a smaller axial dimension (the axial dimension can be reduced to less than 30 mm).

In the present embodiment, the shielding member 5 'includes a first grill 51', a ring portion 52 ', a second grill 53', and a flow guide plate 52 p. Unlike the first embodiment, the annular portion 52' is not of a grid configuration, but is a plate that extends continuously in the circumferential direction C; the first grill 51 'and the annular portion 52' are not integrally formed, and the annular portion 52 'and the second grill 53' may be integrally formed or assembled together. The center of the first grid 51 ' is a detachable portion, and the first grid 51 ' is fixed to the annular portion 52 ' by snap-fitting.

In addition, the annular portion 52 ' extends axially to the other side with respect to the second flange 53 ' by a dimension to guide the airflow generated by the axial fan 4 '. The plurality of flow guide plates 52p are fixed to the annular portion 52', each flow guide plate 52p is formed in an arc-plate shape extending along the circumferential direction C, and each flow guide plate 52p extends from the end edge on the other axial side of the annular portion 52 toward the other axial side while extending obliquely toward the radially inner side, thereby deflecting a part of the airflow flowing toward the other axial side from the axial flow fan 4 toward the radially inner side.

To sum up, the utility model provides a novel fluid compression device, it can last work and need not worry that produced heat leads to each part to break down. The fluid compression device according to the present invention is not limited to the examples of the above embodiments, and the following supplementary explanation is made.

(i) Although the fluid compression device according to the present invention employs the new axial flow fan 4, 4' as a cooling system, the axial dimension of the entire fluid compression device is substantially the same as that of the existing fluid compression device, and thus can be assembled and used without hindrance from other existing accessories, without the need to develop a new accessory.

(ii) Although the motor 1 is employed as the power source in the above embodiment, the present invention is not limited thereto. Any device capable of providing a driving torque may be employed as the power source.

In addition, in addition to the solution of driving the axial fans 4, 4 ' by means of the electric motor 1 driving the compression assembly 3, the fluid compression device may also comprise an additional electric motor generating a driving torque independently of the electric motor 1, which is drivingly coupled to the axial fans 4, 4 ' so that the additional electric motor can drive the axial fans 4, 4 '. In this way, the fluid compression device can be cooled by the axial fans 4, 4' regardless of whether the compression element 3 of the fluid compression device is in operation.

(iii) Although the number of the blades 42, 42 ' of the axial flow fan 4, 4 ' is 11 as described in the above embodiment, this is a preferable solution in consideration of both the shape of the blades 42, 42 ' (chord average angle of the blades 42, 42 ') and the available space in which the blades 42, 42 ' can be disposed. In fact, other numbers of vanes 42, 42' may be provided as desired.

(iv) Although not specifically described in the above embodiment, it is to be understood that the plurality of flow guide plates 52p and the plurality of protrusions 21p are alternately distributed in the circumferential direction C in a staggered manner. In this way, the portion of the air flow deflected by the plurality of flow guide plates 52p can more effectively cool the portion of the case body 21 of the case 2 where the projection 21p is not formed, and the air flow not deflected by the flow guide plates 52p can directly act on the projection 21p to cool the projection 21 p.

(v) It will be appreciated that in accordance with the present invention, which can be used with a dual head fluid compression device, the dual head fluid compression device can include two axially oppositely disposed fluid compression devices of the present invention, which can share a power source. Specifically, in the double-headed fluid compression device, the power source is disposed at the center position, the two housings formed with the projections are disposed at both sides of the power source, and the two axial flow fans are disposed at the outermost sides. Thus, the air flows of the two axial fans 4 of the double-ended fluid compression device can generate air flows in opposite directions, and can also generate convection.

Claims

1. A fluid compression device, comprising:

a power source configured to generate a drive torque;

2. The fluid compression device of claim 1,

the power source having an output shaft extending through the housing in the axial direction, the output shaft being torsionally coupled with the axial fan such that the power source is capable of driving the axial fan; or

3. The fluid compression device of claim 1 or 2 further comprising a shield assembly secured to the housing, the shield assembly surrounding and spaced apart from the axial fan.

4. A fluid compression device as claimed in claim 3 in which the guard assembly comprises two grates and an annular portion, the two grates being located at respective axial ends of the annular portion, the two grates being secured together with the annular portion,

5. The fluid compression device of claim 4, wherein the shield assembly further includes a plurality of flow-guiding plates fixed to the annular portion, each of the flow-guiding plates being formed into an arc-plate shape extending along the circumferential direction, each of the flow-guiding plates extending from an axially other-side end edge of the annular portion toward an axially other side while extending obliquely toward a radially inner side.

6. The fluid compression device of claim 5, wherein the housing is formed with a plurality of lobes distributed along the circumferential direction, each compression assembly pressurizes the fluid within the lobes, and the plurality of flow guide plates alternate with the plurality of lobes in the circumferential direction in a staggered manner.

7. The fluid compression device of claim 3, further comprising a plurality of connectors, each connector comprising a radial portion extending in the radial direction and an axial portion extending in the axial direction, the radial portion being secured to the housing and the axial portion being secured to the shield assembly such that the shield assembly is secured to the housing.

8. The fluid compression device as claimed in claim 1 or 2, wherein the housing includes a housing main body and two flanges at both axial ends of the housing main body, the two flanges being fixed to the housing main body so that the two flanges and the housing main body surround to form the housing space, the two flanges having a central through hole formed at a center thereof through which an output shaft of the power source passes.

9. The fluid compression device as claimed in claim 8, wherein the flange includes a central cylindrical portion and a flange portion extending radially outward from the central cylindrical portion, and wherein a plurality of ribs are formed on both axial side surfaces of the flange portion, each of the ribs extending in the radial direction, and the plurality of ribs are radially distributed on both axial side surfaces.

10. The fluid compression device of claim 8, further comprising a bearing disposed in the central throughbore of the flange, the bearing disposed between the flange and the output shaft of the power source such that the output shaft is rotatably supported by the bearing relative to the flange.