TWI705190B - Bearing system - Google Patents

Abstract

A bearing system is provided to solve the problem where the conventional motor or fan has vibration and noise due to the collision of the rotating member. The bearing system includes a sleeve having a shaft hole intercommunicating the inner and outer areas of the sleeve, two bearings axially aligned with each other in the sleeve and forming an intermediate space therebetween, and a shaft extending through the two bearings and having a first end extending out of the shaft hole. The outer periphery of the shaft is provided with an outer protrusion located in the intermediate space. The outer protrusion can form a dynamic pressure gap with each of the bearings when the shaft is rotating.

Description

Bearing system

The present invention relates to a component of a motor or a fan, especially a bearing system that can be installed in the motor or the fan.

Please refer to FIG. 1, which is a conventional fan 9. The conventional fan 9 has a shaft holder 91, a bearing system 92, a rotor 93 and a stator 94. The bearing system 92 has a shaft barrel 921 assembled and combined with the shaft seat 91, an oil-impregnated bearing 922 is assembled inside the shaft barrel 921, a sealing plug 923 closes the bottom of the shaft barrel 921, and a wear pad 924 is provided on the sealing plug Within 923. The rotor 93 has a shaft 931 penetrating through the oil-impregnated bearing 922, the bottom end of the shaft 931 abuts the wear pad 924, the outer peripheral surface of the shaft 931 is combined with a clasp 932, the clasp 932 is located under the oil-impregnated bearing 922 A hub 933 is coupled to the top of the shaft 931, a plurality of fan blades 934 are connected to the outer circumference of the hub 933, and a magnetic member 935 is connected to the inner circumference of the hub 933. The stator 94 is coupled to the outer circumference of the shaft barrel 921 and diametrically opposed to the magnetic member 935 to drive the rotor 93 to rotate. An embodiment similar to the conventional fan 9 has been disclosed in the Republic of China Patent Publication No. M247713.

When the above-mentioned conventional fan 9 is operating, if the shaft 931 of the shaft 931 drifts upward, the buckle 932 can block the bottom end of the oil bearing 922 to limit the axial displacement of the shaft 931; however, The clasp 932 will repeatedly collide with the bottom end of the oil-impregnated bearing 922, causing the rotor 93 to rotate unstable due to vibration, and noise will also be generated.

In view of this, it is indeed necessary to improve the bearing system of the conventional fan.

In order to solve the above problems, the object of the present invention is to provide a bearing system that can limit the axial displacement of the rotating shaft and greatly reduce the impact of the rotating shaft on the axial end surface of the bearing.

The secondary objective of the present invention is to provide a bearing system whose bottom end of the rotating shaft can be maintained in the air without rubbing other components.

Another object of the present invention is to provide a bearing system that can produce a more even oil film between the shaft and the bearing.

Another object of the present invention is to provide a bearing system with better oil leakage prevention effect.

The directionality described in the full text of the present invention or its similar terms, such as "front", "rear", "left", "right", "up (top)", "down (bottom)", "inner", "outer" , "Side", etc., mainly refer to the directions of the attached drawings. The directional or similar terms are only used to help explain and understand the embodiments of the present invention, and are not used to limit the present invention.

The elements and components described in the full text of the present invention use the quantifiers "one" or "one" for convenience and to provide the general meaning of the scope of the present invention; the present invention should be interpreted as including one or at least one, and single The concept of also includes the plural, unless it clearly implies other meanings.

The approximate terms such as "combination", "combination" or "assembly" mentioned in the full text of the present invention mainly include the types that can be separated without destroying the components after being connected, or the components can not be separated after being connected, which are common knowledge in the field Those can be selected based on the materials of the components to be connected or assembly requirements.

The bearing system of the present invention includes: a bushing connected to the inner part of the bushing by a shaft hole The bushing has a ring wall connected to the outer part, and the sealing part is opposite to the shaft hole; two bearings are located in the bushing axially oppositely, and a space is formed between the two bearings; and The rotating shaft penetrates the two bearings and the first end passes through the shaft hole. The circumferential surface of the rotating shaft is connected with an outer convex portion located in the space, and the outer convex portion can communicate with each other when the rotating shaft rotates. A dynamic pressure gap is formed between the axial end surfaces of the bearing, the second end of the rotating shaft is located inside the bushing, the second end of the rotating shaft can be spaced from the bottom of the seal to maintain vacancy, and the inner surface of the bottom of the seal can be connected There is a protruding support part, which is farther away from the center position of the bottom part and closer to the ring wall, and can abut against the axial end surface of one of the aforementioned bearings.

Accordingly, in the bearing system of the present invention, when the convex part of the rotating shaft rotates, an oil film can be generated between the convex part and the two bearings due to dynamic pressure, which not only allows the rotating shaft to maintain smooth rotation, but also The two oil films suppress the axial displacement of the rotating shaft and prevent the convex part from colliding with the two bearings, so it can effectively reduce operating noise and vibration, and has the effect of improving the quality of the fan or motor equipped with the bearing system, and when the rotating shaft rotates It does not rub the bottom of the seal, has the functions of improving the smoothness of the rotation of the rotating shaft, reducing the operating noise and prolonging the service life of the bearing system. In addition, it can be formed with a simple structure so that the bearing and the bottom of the seal can be formed within the support part A space is provided for the second end of the rotating shaft to be vacated, which has the functions of easy manufacturing and assembly.

The bearing system of the present invention includes: a bushing connecting the inside and the outside of the bushing by a shaft hole; two bearings located inside the bushing axially oppositely, and a space is formed between the two bearings; and The rotating shaft penetrates the two bearings and the first end passes through the shaft hole. The circumferential surface of the rotating shaft is connected with an outer convex portion located in the space, and the outer convex portion can communicate with each other when the rotating shaft rotates. A dynamic pressure gap is formed between the axial end surfaces of the bearing, and the minimum radial width of the shaft hole can be greater than the inner diameter of the two bearings. In this way, it can be ensured that the rotating shaft does not collide with the end plate when rotating relative to the two bearings, and has the effect of improving the smoothness of the rotating shaft.

Wherein, the outer convex portion can be integrally connected to the circumferential surface of the rotating shaft, and from the circumferential surface Extends radially outward. In this way, the position of the convex portion on the circumferential surface of the rotating shaft can be kept constant, which can reduce the influence of assembly error or subsequent relative displacement on the effect of oil film formation, and has the function of improving the operation stability of the bearing system effect.

Wherein, the outer convex portion can be combined with the circumferential surface of the rotating shaft and extend radially outward from the circumferential surface. In this way, it has the effect of improving the convenience of manufacturing and assembly.

Wherein, the outer convex portion may be disk-shaped to completely enclose the circumferential surface of the rotating shaft. In this way, the oil film generated between the convex portion and each bearing can be more even, which has the effect of improving the smoothness of the rotation of the shaft.

Wherein, at least part of the shaft hole may be in a form of gradually expanding from bottom to top along the axial direction. In this way, the lubricating oil accidentally overflowing to the shaft hole will be less likely to continue to flow out to the outside, which has the effect of improving the oil leakage prevention effect.

Wherein, the bushing may have a ring wall integrally formed to connect to the bottom of the seal, the bottom of the seal closes the bottom of the ring, and the shaft hole is opposite to the bottom of the seal. In this way, the bottom end of the ring wall can be completely closed by the sealing bottom to effectively avoid leakage of lubricating oil inside the bushing.

Wherein, the bushing may have a ring wall combined with a sealing bottom, the sealing bottom being opposite to the shaft hole, and an anti-leak gasket contacting the inner wall of the ring wall and abutting the sealing bottom and one of the aforementioned bearings. In this way, it has the effect of improving the oil leakage prevention effect.

Wherein, the bushing may have a ring wall combined with an end plate, the shaft hole is arranged on the end plate, the end plate has a ring groove, and a leak-proof gasket is arranged on the ring groove and contacts the inner wall of the ring wall. In this way, the axial height required to be increased due to the installation of the anti-leak gasket can be reduced, and the oil leakage prevention effect can be improved.

The bearing system may further include a spacer ring located inside the bushing and abutting against the axial end surfaces of the two bearings, the spacer space is located within the inner ring surface of the spacer ring, the inner ring surface of the spacer ring and the shaft The convex parts are spaced apart to maintain non-contact. In this way, the interval space can be easily defined by the spacer ring, which has the effect of improving the convenience of assembly.

Wherein, the bushing has a ring wall connecting the bottom of the seal and an end plate, the shaft hole is provided on the end plate and opposite to the bottom of the seal, the end plate can abut one of the aforementioned bearings, and the other aforementioned bearing can abut the Bottom cover. In this way, even if the two bearings are not tightly combined with the inner wall of the ring wall, they can still be accurately positioned inside the bushing, so that the two bearings can be more easily manufactured due to a large tolerance range of machining errors.

Wherein, the two opposite axial end surfaces of the two bearings may be respectively connected to a protruding portion, the protruding portions of the two bearings abut against each other, and the spacing space is located on the inner circumference of the two protruding portions. In this way, the aforementioned spacer ring can be omitted, so as to reduce the number of components to be assembled, which has the effects of improving assembly convenience and efficiency.

Wherein, the bushing has a ring wall, and the two bearings can be tightly combined with the inner wall of the ring wall. In this way, the aforementioned spacer ring can be omitted, thereby reducing the number of components to be assembled, and further simplifying the structure of the two bearings, which has the effect of reducing manufacturing and assembly costs.

Wherein, the axial height of the outer convex portion may be smaller than the axial height of the spacing space. In this way, it has the functions of improving the smoothness of the rotation of the rotating shaft.

Wherein, the outer diameter of the rotating shaft is preferably slightly smaller than the inner diameter of the two bearings. In this way, it has the functions of improving the smoothness of the rotation of the rotating shaft.

Wherein, the axial end surface of at least one of the aforementioned bearings may have a plurality of dynamic pressure grooves, and the plurality of dynamic pressure grooves are opposed to the axial surface of the convex portion to form the dynamic pressure gap. In this way, it has the effect of further improving the dynamic pressure effect generated by the bearing system during operation.

Wherein, at least one axial surface of the outer convex portion may have a plurality of dynamic pressure grooves, and the plurality of dynamic pressure grooves are opposed to the axial end surface of the bearing to form the dynamic pressure gap. In this way, it has the effect of further improving the dynamic pressure effect generated by the bearing system during operation.

〔this invention〕

1: bushing

11: Ring wall

12: bottom cover

121: inner surface

13: End plate

131: Ring groove

14: Shaft hole

15: Support

2: bearing

2a: First bearing

2b: second bearing

21: Axial end face

22: Outer peripheral surface

23: protrusion

24: Dynamic pressure groove

3: shaft

3a: first end

3b: second end

31: Circumferential surface

32: convex part

321: Axial surface

322: Dynamic Pressure Ditch

4: Spacer ring

41: inner ring surface

5: Fan frame

51: bottom plate

6: stator

7: Fan wheel

71: blade

8: Leak-proof gasket

D1: Outer diameter

D2: inner diameter

E: External

F: Internal

G: Dynamic pressure gap

H1, H2: axial height

M: opening

S: Space

W: minimum radial width

[Traditional]

9: Fan

91: Axle seat

92: bearing system

921: Shaft Tube

922: Oil Bearing

923: sealing plug

924: Wear pad

93: Rotor

931: Axle

932: clasp

933: Wheel Hub

934: fan blade

935: magnetic parts

94: stator

[Figure 1] A sectional structural diagram of a conventional fan.

[Figure 2] An exploded perspective view of the first embodiment of the present invention.

[Figure 3] A combined cross-sectional view of the first embodiment of the present invention.

[Figure 4] A sectional view of a fan with a bearing system according to the first embodiment of the invention.

[Figure 5] A combined cross-sectional view of the second embodiment of the present invention.

[Figure 6] A combined cross-sectional view of the third embodiment of the present invention.

[Figure 7] A partially cutaway perspective view of another aspect of the bearing of the present invention.

[Figure 8] A perspective view of another aspect of the shaft of the present invention.

In order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following is a detailed description of the preferred embodiments of the present invention with the accompanying drawings: Please refer to Figures 2 and 3 As shown, it is the first embodiment of the bearing system of the present invention, which includes a bushing 1, two bearings 2 and a rotating shaft 3. The two bearings 2 are located inside the bushing 1 and the rotating shaft 3 penetrates the two bearings 2 And one end protrudes out of the bush 1.

The bushing 1 has a ring wall 11 connected to a bottom part 12 to close the bottom end of the ring wall 11 by the bottom part 12, and a space where the two bearings 2 can be arranged is formed in the inner F of the bushing 1. Wherein, the bottom seal 12 can be assembled and combined with the ring wall 11, for example, tightly coupled and laser welded at the joint; or preferably integrally formed to connect the ring wall 11, so that the bushing 1 is formed in a cup shape. The top end has an opening M, and the bottom end is completely closed to effectively prevent leakage of lubricating oil inside F of the bushing 1. In addition, the bushing 1 may be provided with an end plate 13 adjacent to the opening M. The end plate 13 is connected to the ring wall 11 and is axially opposite to the bottom part 12, so that the end plate 13 substantially closes the opening M. , And a shaft hole 14 penetrates through the end plate 13, so that the shaft hole 14 can communicate the inner F and the outer of the bushing 1 E, and for the shaft 3 to penetrate. In this embodiment, the end plate 13 can be joined to the inner wall of the ring wall 11 by its outer periphery, and the joining method is, for example, but not limited to, tight fitting, gluing or welding. In addition, preferably, at least part of the shaft hole 14 is in a shape that gradually expands from bottom to top along the axial direction, so that the lubricating oil accidentally overflowing to the shaft hole 14 is less likely to continue to flow out to the outside E.

The two bearings 2 are axially spaced apart in the interior F of the bush 1 to form a space S between the two bearings 2; the two bearings 2 can be selected as oil-impregnated bearings, for example. For ease of description, the aforementioned two bearings 2 are respectively referred to as a first bearing 2a and a second bearing 2b below. The first bearing 2a has two axial end surfaces 21 and an outer peripheral surface 22, and the second bearing 2b is the same. One of the axial end surfaces 21 of the first bearing 2a is axially opposite to one of the axial end surfaces 21 of the second bearing 2b.

The first bearing 2a and the second bearing 2b can be tightly coupled with the inner wall of the ring wall 11 by the outer peripheral surface 22 respectively. Or, as shown in the diagram of this embodiment, the first bearing 2a is directly or indirectly abutted against the bottom 12 of the bushing 1 from one of the axial end faces 21, and then a spacer ring 4 is inserted into the bushing. The inner part F of the sleeve 1 abuts the other axial end surface 21 of the first bearing 2a, and then makes the second bearing 2b abut the spacer ring 4 from one of the axial end surfaces 21, and finally combines the end plate 13 with the The ring wall 11 abuts the other axial end surface 21 of the second bearing 2b; in this way, even if the first bearing 2a and the second bearing 2b are not tightly coupled with the inner wall of the ring wall 11, they can still be accurately Located in the inner F of the bushing 1, the two bearings can be more easily manufactured due to the large tolerance range of machining errors. In addition, the inner ring surface 41 of the spacer ring 4 can form the spacer space S, and the spacer ring 4 defines the axial height of the spacing space S (that is, the distance between the first bearing 2a and the second bearing 2b relative to the axial end surface 21).

The rotating shaft 3 penetrates the first bearing 2 a and the second bearing 2 b, and the first end 3 a of the rotating shaft 3 passes through the shaft hole 14 on the end plate 13. Wherein, the outer diameter D1 of the rotating shaft 1 is preferably slightly smaller than the inner diameter D2 of the first bearing 2a and the second bearing 2b to improve the smoothness of the rotating shaft 1; in addition, the minimum radial width of the shaft hole 14 W is preferably greater than the first bearing 2a and the second bearing The inner diameter D2 of 2b is to ensure that the rotating shaft 3 does not collide with the end plate 13 when rotating relative to the first bearing 2a and the second bearing 2b.

On the other hand, the second end 3b of the rotating shaft 3 is located in the inner F of the bushing 1 and opposite to the bottom part 12 of the bushing 1; preferably, the second end 3b of the rotating shaft 3 can be opposite to the bottom part 12 The space is separated to maintain the air, so that when the rotating shaft 3 rotates, the bottom seal 12 will not be rubbed. Specifically, in this embodiment, the inner surface 121 of the bottom part 12 of the bushing 1 can be optionally connected with a protruding support portion 15, and the support part 15 may, for example, protrude from the inner surface of the bottom part 12 in a ring shape. 121, and can be farther away from the center position of the bottom part 12 and closer to the ring wall 11; in this way, the axial end face 21 of the first bearing 2a can abut the support part 15, so that the simple structure makes the A space may be formed within the supporting portion 15 between the first bearing 2a and the bottom portion 12 for the second end 3b of the rotating shaft 3 to be vacated.

The circumferential surface 31 of the rotating shaft 3 is connected to an outer convex portion 32. The outer convex portion 32 is generally arranged in the space S extending radially outward from the circumferential surface 31, so that the outer convex portion 32 has two The axial surface 321, and the two axial surfaces 321 respectively face the first bearing 2a and the second bearing 2b. The present invention does not limit the shape of the convex portion 32. The axial height H1 of the convex portion 32 is smaller than the axial height H2 of the spacing space S, and the convex portion 32 can be made to be convex during the rotation of the rotating shaft 3. It is a principle that a dynamic pressure gap G can be formed between the portion 32 and the two bearings 2 respectively; in this embodiment, the outer convex portion 32 can be selected to be a disc shape to completely enclose the circumferential surface 31 of the rotating shaft 3. It is worth mentioning that in the embodiment with the aforementioned spacer ring 4, the outer convex portion 32 should be spaced apart from the inner ring surface 41 of the spacer ring 4 to maintain non-contact, so as to avoid affecting the smoothness of the rotation of the shaft 3. In addition, the convex portion 32 may be integrally formed to connect to the circumferential surface 31 of the rotating shaft 3 (as shown in Figures 5 and 6), or may be connected to the ring of the rotating shaft 3 by means of laser welding or tight fitting. The peripheral surface 31 is not limited by the present invention.

Please refer to Figures 3 and 4. According to the aforementioned structure, in a fan with the bearing system (the figure takes a centrifugal fan as an example), the bushing 1 can be combined with a bottom of a fan frame 5. The plate 51 and the stator 6 are arranged on the outer circumference of the bush 1, and a fan wheel 7 including several blades 71 is coupled to the first end 3 a of the rotating shaft 3. When the fan is operating, the stator 6 can drive the fan wheel 7 to rotate, thereby linking the rotating shaft 3 to rotate relative to the first bearing 2a and the second bearing 2b. During the rotation of the shaft 3, the lubricating oil located in the dynamic pressure gap G between the convex portion 32 and the first bearing 2a can generate an oil film, which is located between the convex portion 32 and the second bearing 2b The lubricating oil in the dynamic pressure gap G can generate another oil film, so that the rotating shaft 3 can maintain smooth rotation, and the two oil films prevent the convex portion 32 from colliding with the first bearing 2a or the second bearing 2b. When the bearing system of this embodiment is in operation, it is not prone to noise and vibration caused by impacting the first bearing 2a or the second bearing 2b. In addition, the dynamic pressure generated between the convex portion 32 and the first bearing 2a, as well as the dynamic pressure generated between the convex portion 32 and the second bearing 2b, can restrain the shaft 3 from generating an axial direction. The effect of displacement.

Please refer to Figure 5, which is the second embodiment of the bearing system of the present invention. In this embodiment, the end plate 13 can be integrally formed to connect the ring wall 11, so that the opening M of the bushing 1 is formed at the bottom end and is axially opposite to the shaft hole 14; in the first bearing 2a, the After the second bearing 2b and the rotating shaft 3 are placed in the inner F of the bushing 1, the opening M is closed by the bottom seal 12 to prevent the lubricating oil in the inner F of the bushing 1 from leaking. In addition, the supporting portion 15 of this embodiment may be integrally connected to the inner surface 121 of the bottom part 12, so that the supporting portion 15 abuts the first bearing 2a while closing the opening M.

On the other hand, the first bearing 2a and the second bearing 2b of this embodiment can be respectively connected with a protruding portion 23 on the two opposite axial end faces 21, and the first bearing 2a and the second bearing 2b are in the bushing The interior F of 1 is positioned so that the two protrusions 23 abut against each other, so that the spacing space S can be formed on the inner circumference of the two protrusions 23. In this way, the aforementioned spacer ring 4 (marked in Fig. 3) can be omitted in the bearing system of this embodiment, so as to simplify the number of components to be assembled. The present invention also does not limit the shape of the protruding portion 23; in this embodiment, the protruding portion 23 can protrude from the axial end surface 21 in a ring shape, so that the protruding portion 23 is easier Be processed into shape. In other embodiments, also It is possible that only one of the first bearing 2a or the second bearing 2b has the protruding portion 23, based on the principle that the spacing space S can be formed stably.

Please refer to Figure 6, which is the third embodiment of the bearing system of the present invention. In this embodiment, the first bearing 2a and the second bearing 2b of this embodiment can be tightly coupled to the inner wall of the ring wall 11, and the aforementioned spacer ring 4 (marked in Figure 3) can also be omitted, and The structure of the first bearing 2a and the second bearing 2b is further simplified.

In addition, both the sealing bottom 12 and the end plate 13 can be connected to the ring wall 11 in an assembling manner, instead of being integrally formed with the ring wall 11. Therefore, the sealing bottom 12 and the end plate 13 can preferably be further connected. An anti-leak gasket 8 is provided respectively to avoid leakage of lubricating oil inside F of the bush 1. In detail, the leak-proof gasket 8 matched with the bottom seal 12 can contact the inner wall of the ring wall 11, and one end abuts the first bearing 2a, and the other end abuts the bottom seal 12 or protrudes from the The support part 15 of the inner surface 121 of the bottom part 12. The end plate 13 can be provided with a ring groove 131 facing the second bearing 2b, so that the leak-proof washer 8 matched with the end plate 13 can be arranged in the ring groove 131 and contact the inner wall of the ring wall 11, thereby reducing The axial height required to increase the anti-leak gasket 8 is provided. It is worth noting that the leak-proof gasket 8 is not limited to be used in this embodiment, and any embodiment in which the bottom part 12 or the end plate 13 is not integrally connected with the ring wall 11 can be applied.

Please refer to Figures 7 and 8, in order to further enhance the dynamic pressure effect generated by the bearing system of the present invention during operation, each of the above-mentioned embodiments can choose to have at least one bearing 2 on the axial end face 21 with several dynamic pressures. Press groove 24, and make the plurality of dynamic pressure grooves 24 oppose the axial surface 321 of the outer convex portion 32 to form the dynamic pressure gap G (marked in Fig. 6); or select the outer convex portion 32 At least one axial surface 321 is provided with a plurality of dynamic pressure grooves 322, and the plurality of dynamic pressure grooves 322 are opposed to the axial end surface 21 of the bearing 2 to form the dynamic pressure gap G; or alternatively, the bearing 2 is provided with several The dynamic pressure groove 24 and the outer convex portion 32 are also provided with a plurality of dynamic pressure grooves 322, and the plurality of dynamic pressure grooves 24 are opposed to the plurality of dynamic pressure grooves 322.

In detail, the plurality of dynamic pressure grooves 24 of the bearing 2 may be radially distributed on the axial end surface 21, and each of the dynamic pressure grooves 24 may have a curved arc shape, preferably connecting the inner and outer circumferences of the bearing 2. Make the circulation of lubricating oil smoother to produce better dynamic pressure effect. Similarly, the plurality of dynamic pressure grooves 322 provided on the outer convex portion 32 may also be radially distributed on the axial surface 321, and each of the dynamic pressure grooves 322 may be curved and preferably connected to the outer convex portion. When the two axial surfaces 321 of the convex portion 32 are provided with a plurality of dynamic pressure grooves 322, the plurality of dynamic pressure grooves 322 at the upper end can be axially opposed to the plurality of dynamic pressure grooves 322 at the lower end. Dislocation is not limited by the present invention.

To sum up, in the bearing system of the present invention, when the convex part of the rotating shaft rotates, an oil film can be generated between the convex part and the two bearings due to dynamic pressure, which not only allows the rotating shaft to maintain smooth rotation, but also The two oil films can restrain the axial displacement of the rotating shaft and prevent the convex part from colliding with the two bearings, so the operation noise and vibration can be effectively reduced, and the quality of the fan or motor equipped with the bearing system can be improved.

It is worth mentioning that the bearing system of the present invention can also be assembled in advance, so that the bushing can be quickly assembled to the housing of the fan or motor, and the shaft is combined with the rotor of the fan or motor to enhance the assembly of the fan. Or the efficiency of the motor.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art without departing from the spirit and scope of the present invention may make various changes and modifications relative to the above-mentioned embodiments. The technical scope of the invention is protected. Therefore, the scope of protection of the invention shall be subject to the scope of the attached patent application.

1: bushing

11: Ring wall

12: bottom cover

121: inner surface

13: End plate

14: Shaft hole

15: Support

2: bearing

2a: First bearing

2b: second bearing

21: Axial end face

22: Outer peripheral surface

3: shaft

3a: first end

3b: second end

31: Circumferential surface

32: convex part

4: Spacer ring

41: inner ring surface

D1: Outer diameter

D2: inner diameter

E: External

F: Internal

G: Dynamic pressure gap

H1, H2: axial height

M: opening

S: Space

W: minimum radial width

Claims (17)

A bearing system includes: a bushing connecting the inside and the outside of the bushing by a shaft hole; the bushing has a ring wall connecting a bottom part opposite to the shaft hole; and two bearings, which are located axially oppositely Inside the bushing, a space is formed between the two bearings; and a rotating shaft that penetrates the two bearings and the first end passes through the shaft hole. The circumferential surface of the rotating shaft is connected to an outer convex portion, and the outer convex portion Located in the space, the outer convex portion can form a dynamic pressure gap between the shaft and the axial end surface of each bearing when the shaft rotates, the second end of the shaft is located inside the bush, and the second end of the shaft is connected to The bottom of the seal is spaced apart to maintain the air, the inner surface of the bottom of the seal is connected with a protruding support part, the support part is farther from the center of the bottom of the seal and closer to the ring wall, the support part abuts one of the aforementioned bearings的axial end face. Such as the bearing system of claim 1, wherein the convex portion is integrally connected with the circumferential surface of the rotating shaft, and extends radially outward from the circumferential surface. The bearing system of claim 1, wherein the outer convex portion is coupled to the circumferential surface of the rotating shaft and extends radially outward from the circumferential surface. Such as the bearing system of claim 1, wherein the outer convex portion is disk-shaped to completely enclose the circumferential surface of the rotating shaft. Such as the bearing system of claim 1, wherein the bushing has a ring wall integrally formed to connect to a bottom, the sealing bottom closes the bottom end of the ring wall, and the shaft hole is opposite to the sealing bottom. The bearing system of claim 1, wherein the bushing has a ring wall combined with a sealing bottom, the sealing bottom is opposite to the shaft hole, and a leak-proof gasket contacts the inner wall of the ring wall and abuts the sealing bottom and one of the sealing bottoms. The aforementioned bearing. Such as the bearing system of claim 1, wherein the bushing has a ring wall and one end A plate, the shaft hole is arranged on the end plate, the end plate is provided with a ring groove, and a leak-proof gasket is arranged on the ring groove and contacts the inner wall of the ring wall. For example, the bearing system of claim 1, further comprising a spacer ring located inside the bush and abutting the axial end faces of the two bearings, the spacer space is located within the inner ring surface of the spacer ring, and the inner ring surface of the spacer ring It is spaced from the outer convex part of the rotating shaft to maintain no contact. Such as the bearing system of claim 8, wherein the bushing has a ring wall connecting a bottom and an end plate, the shaft hole is provided on the end plate and is opposite to the bottom of the seal, the end plate abuts against one of the aforementioned bearings, and An aforementioned bearing abuts the bottom of the seal. Such as the bearing system of claim 1, wherein the two opposite axial end faces of the two bearings are respectively connected to a protruding part, the protruding parts of the two bearings abut against each other, and the spacing space is located on the inner circumference of the two protruding parts. The bearing system of claim 1, wherein the bushing has an annular wall, and the two bearings are tightly coupled with the inner wall of the annular wall. Such as the bearing system of claim 1, wherein the axial height of the convex portion is smaller than the axial height of the space. Such as the bearing system of claim 1, wherein the outer diameter of the rotating shaft is smaller than the inner diameter of the two bearings. A bearing system includes: a bushing connecting the inside and the outside of the bushing by a shaft hole; two bearings located inside the bushing axially oppositely, and a space is formed between the two bearings; and a rotating shaft, The shaft hole penetrates through the two bearings and the first end passes through it. The circumferential surface of the rotating shaft is connected to an outer convex portion located in the space. The outer convex portion can interact with each bearing when the rotating shaft rotates. A dynamic pressure gap is formed between the axial end faces of the shaft, and the minimum radial width of the shaft hole is greater than the inner path. For example, the bearing system of claim 14, wherein at least part of the shaft hole is in the form of gradually expanding from bottom to top in the axial direction. The bearing system of any one of claims 1 to 15, wherein the axial end surface of at least one of the aforementioned bearings has a plurality of dynamic pressure grooves, and the plurality of dynamic pressure grooves are opposed to the axial surface of the convex portion to form the Dynamic pressure gap. The bearing system of any one of claims 1 to 15, wherein at least one axial surface of the convex portion has a plurality of dynamic pressure grooves, and the plurality of dynamic pressure grooves are opposed to the axial end surface of the bearing to form the Dynamic pressure gap.

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