TW201837320A - Fan device and bearing assembly thereof - Google Patents

Abstract

The present invention provides a fan device and a bearing assembly thereof. The bearing assembly includes a bearing structure, a shaft structure and a flexible surrounding structure. The bearing structure has a bearing body and a through hole passing through the bearing body, and the through hole has a first receiving space. The shaft structure has a shaft body, and the shaft body passes through the through hole and partially received inside the through hole. The flexible surrounding structure is received inside the first receiving space and is abutted between the bearing body and the shaft body. Therefore, the flexible surrounding structure can be restricted by the first receiving space and surroundingly abutted against the shaft body so as to effectively support the shaft body and prevent lubricants from leaking from between the bearing body and the shaft body, so that the present invention is oil-leak proof and dustproof.

Description

   Fan device and bearing assembly thereof   

The invention relates to a fan device and a bearing assembly thereof, and in particular, to a fan device and a bearing assembly using an embedded flexible surrounding structure.

In the prior art, the cooling fan is one of the main components in the cooling module. In recent years, in order to cope with the trend of miniaturization, thinness, and increasing processor operating power for information products such as notebook computers and tablet computers, the cooling module must also be miniaturized, thinned, and simultaneously required. Considering the development of the direction of improving heat dissipation efficiency. Therefore, the fan used in the heat dissipation module must also have the advantages of specific volume reduction, reduced thickness, and increased fan speed. In order to meet the needs of fan miniaturization, thinness and high speed, at present, quite a lot of cooling fans have been changed to adopt dynamic pressure bearing design to replace traditional bearings.

The technical problem to be solved by the present invention is to provide a fan device using an embedded flexible surrounding structure and a bearing assembly thereof for the disadvantages of the prior art.

In order to solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a bearing assembly, which includes a bearing structure, a shaft center structure and a flexible surrounding structure. The bearing structure has a bearing body and a through hole penetrating through the bearing body, wherein the through hole has a first receiving space. The shaft center structure has a shaft center body, wherein the shaft center body penetrates the through hole and is partially accommodated in the through hole. The flexible surrounding structure is accommodated in the first accommodation space and is abutted between the bearing body and the shaft body.

Furthermore, the through hole has a second accommodation space and a third accommodation space, and the first accommodation space is communicated between the second accommodation space and the third accommodation space. Wherein, the first accommodation space has a first diameter, the second accommodation space has a second diameter, the third accommodation space has a third diameter, and The first diameter is larger than the second diameter of the second accommodation space, and the second diameter of the second accommodation space is larger than the third diameter of the third accommodation space.

Furthermore, the bearing body has an axial center inlet and an axial center outlet, and the through hole has a second accommodation space, a third accommodation space, a fourth accommodation space, and a fifth accommodation. Space, the second accommodation space is communicated between the axis entrance and the first accommodation space, and the third accommodation space is communicated between the first accommodation space and the fourth accommodation space Space, the fourth accommodation space communicates with the third accommodation space and the fifth accommodation space, and the fifth accommodation space communicates with the axis exit and the fourth accommodation space Between, wherein the first accommodation space has a first diameter, the second accommodation space has a second diameter, the third accommodation space has a third diameter, and the fourth accommodation The space has a fourth diameter, and the fifth receiving space has a fifth diameter, the first diameter is larger than the second diameter, the second diameter is larger than the third diameter, and the third diameter is equal to The fifth diameter, and the third diameter and the fifth diameter are both smaller than the fourth diameter Diameter.

Further, the shaft body has a first partial section, a second partial section, a third partial section, a fourth partial section, a fifth partial section, and a sixth partial section. And a seventh partial section, the first partial section is accommodated in the first accommodating space and is surrounded and abutted by the flexible surrounding structure, and the second partial section is connected to the One end of the first partial section is accommodated in the second accommodating space, and the third partial section is connected to the other end of the first partial section and is accommodated in the third accommodating space The fourth partial section is connected to the third partial section and accommodated in the fourth accommodating space, and the fifth partial section is connected to the fourth partial section and accommodated in In the fifth accommodating space, the sixth partial section is connected to the second partial section and is exposed outside the bearing body, and the seventh partial section is connected to the fifth section. And exposed on the outside of the bearing body.

Further, the bearing body has a first surrounding inner surface located in the first accommodation space, a second surrounding inner surface located in the second accommodation space, and a second A third surrounding inner surface in the three containing spaces, a fourth surrounding inner surface in the fourth containing space, and a fifth surrounding inner surface in the fifth containing space. The distance between the first surrounding inner surface and the second surrounding inner surface is greater than a cross-sectional radius before the flexible surrounding structure is compressed, and the first surrounding inner surface and the third surrounding inner surface The interval between the surrounding inner surfaces is smaller than a cross-sectional diameter before the flexible surrounding structure is compressed, wherein the bearing body has a plurality of first grooves, and the plurality of first grooves are disposed at The third surrounding inner surface, wherein the bearing body has a plurality of second grooves, and the plurality of second grooves are provided on the fifth surrounding inner surface.

In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a bearing assembly, which includes a bearing structure, an axial center structure, and a flexible surrounding structure. The bearing structure has a bearing body and a through-hole penetrating through the bearing body, wherein the bearing body has a step-like surrounding groove which is disposed in the through-hole in a surrounding manner. The shaft center structure has a shaft center body passing through the through hole. The flexible surrounding structure is embedded in the stepped surrounding groove and is abutted between the bearing body and the shaft body.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a fan device, which includes: a bearing assembly and a cooling fan. The bearing assembly includes a bearing structure, a shaft center structure, and a flexible surrounding structure. The bearing structure has a bearing body and a through hole penetrating through the bearing body, wherein the through hole has a first receiving space. The shaft center structure has a shaft center body, wherein the shaft center body penetrates the through hole and is partially accommodated in the through hole. The flexible surrounding structure is accommodated in the first accommodation space and is abutted between the bearing body and the shaft center body. The cooling fan is sleeved on the shaft body.

The beneficial effect of the present invention is that when the axial center body penetrates the through hole and is partially accommodated in the through hole, the flexible surrounding structure can pass through the space of the first accommodation space (or the step-like surrounding groove). Limit and surround the first part of the shaft body, so that the shaft body can be effectively supported, and the lubricant can be prevented from leaking between the bearing body and the shaft body to prevent leakage. The dual effect of oil and dust.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description, and are not intended to limit the present invention.

Z‧‧‧Fan unit

F‧‧‧cooling fan

S‧‧‧bearing assembly

1‧‧‧bearing structure

10‧‧‧bearing body

100‧‧‧step difference surrounding groove

101‧‧‧first groove

102‧‧‧Second Groove

100A‧‧‧Axis entrance

100B‧‧‧Axis exit

1001‧‧‧First surrounding inner surface

1002‧‧‧Second surrounding inner surface

1003‧‧‧ Third inner surface

1004‧‧‧ Fourth surrounding inner surface

1005‧‧‧ Fifth surrounding inner surface

11‧‧‧through hole

111‧‧‧First accommodation space

112‧‧‧Second accommodation space

113‧‧‧Third accommodation space

114‧‧‧Fourth accommodation space

115‧‧‧Fifth accommodation space

D1‧‧‧first diameter

D2‧‧‧Second diameter

D3‧‧‧ third diameter

D4‧‧‧ Fourth diameter

D5‧‧‧ fifth diameter

2‧‧‧ axis structure

20‧‧‧Axis body

201‧‧‧ Part I

202‧‧‧ Section II

203‧‧‧ Section III

204‧‧‧ Section IV

205‧‧‧Part 5 Section

206‧‧‧Part VI

207‧‧‧Part 7 Section

3‧‧‧ Flexible around structure

r‧‧‧ cross section radius

d‧‧‧section diameter

H1‧‧‧First Pitch

H2‧‧‧Second Pitch

FIG. 1 is an exploded perspective view of a bearing assembly according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along a line II-II in FIG. 1.

FIG. 3 is a schematic three-dimensional assembly diagram of a bearing assembly according to an embodiment of the present invention.

4 is a schematic cross-sectional view taken along a line IV-IV in FIG. 3.

5 is a schematic partial cross-sectional view of a bearing structure and a flexible surrounding structure of a bearing assembly provided in one embodiment of the present invention.

6 is a schematic cross-sectional view of a second bearing structure of a bearing assembly according to an embodiment of the present invention.

7 is a schematic cross-sectional view of a third bearing structure of a bearing assembly according to an embodiment of the present invention.

8 is a schematic cross-sectional view of a fourth bearing structure of a bearing assembly according to an embodiment of the present invention.

FIG. 9 is a schematic cross-sectional view of a fan device according to another embodiment of the present invention.

The following is a description of specific embodiments of the “fan device and its bearing assembly” disclosed in the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention may be implemented or applied through other different specific embodiments, and various details in this specification may also be based on different viewpoints and applications, and various modifications and changes may be made without departing from the spirit of the present invention. In addition, the drawings of the present invention are merely a schematic illustration, and are not drawn according to actual dimensions, and are stated in advance. The following embodiments will further describe the related technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

Please refer to FIG. 1 to FIG. 4. One embodiment of the present invention provides a bearing assembly S, which includes a bearing structure 1, an axial center structure 2, and a flexible surrounding structure 3. For example, the bearing assembly S may be a dynamic pressure bearing assembly, and the flexible surrounding structure 3 may be an embedded flexible surrounding structure.

First, as shown in FIGS. 1 and 2, the bearing structure 1 has a bearing body 10 and a through hole 11 penetrating the bearing body 10. In addition, the through hole 11 has a first accommodation space 111, a second accommodation space 112, a third accommodation space 113, a fourth accommodation space 114, and a fifth accommodation space 115, and the first accommodation The accommodation space 111 is connected between the second accommodation space 112 and the third accommodation space 113. Furthermore, the bearing body 10 has a shaft center inlet 100A and a shaft center outlet 100B. The second accommodation space 112 is communicated between the axis entrance 100A and the first accommodation space 111, and the third accommodation space 113 is communicated with the first accommodation space 111 and the fourth accommodation space 114. The fourth accommodation space 114 is communicated with the third accommodation space 113 and the fifth accommodation space 115, and the fifth accommodation space 115 is communicated between the shaft outlet 100B and the fourth accommodation space 114. That is, the second accommodation space 112, the first accommodation space 111, the third accommodation space 113, the fourth accommodation space 114, and the fifth accommodation space 115 will be sequentially connected.

As mentioned above, the first receiving space 111 has a first diameter D1, the second receiving space 112 has a second diameter D2, the third receiving space 113 has a third diameter D3, and the fourth receiving space 114 The fourth receiving space 115 has a fourth diameter D4. Furthermore, the first diameter D1 of the first accommodation space 111 is larger than the second diameter D2 of the second accommodation space 112, and the second diameter D2 of the second accommodation space 112 is larger than the third accommodation space 113. The third diameter D3. The third diameter D3 of the third accommodation space 113 is substantially equal to the fifth diameter D5 of the fifth accommodation space 115, and the third diameter D3 of the third accommodation space 113 and the fifth diameter of the fifth accommodation space 115 D5 is all smaller than the fourth diameter D4 of the fourth accommodation space 114, so that a surrounding oil storage tank can be additionally provided in the fourth accommodation space 114.

Furthermore, as shown in FIGS. 2 to 4, the shaft center structure 2 has a shaft center body 20, and the shaft center body 20 passes through the through hole 11 and is partially accommodated in the through hole 11. In addition, the flexible surrounding structure 3 is accommodated in the first accommodating space 111 and is abutted (abutted or compressed) between the bearing body 10 and the shaft body 20. That is, the bearing body 10 has a stepped surrounding groove 100 provided in the through hole 11 in a surrounding manner, and the flexible surrounding structure 3 is embedded in the stepped surrounding groove 100 and is abutted against it. Between the bearing body 10 and the shaft center body 20. For example, the flexible surrounding structure 3 may be an O-ring or any elastic ring.

As mentioned above, the shaft body 20 has a first partial section 201, a second partial section 202, a third partial section 203, a fourth partial section 204, a fifth partial section 205, and a A sixth partial section 206 and a seventh partial section 207. Furthermore, the first partial section 201 is accommodated in the first accommodation space 111 and is surrounded and abutted by the flexible surrounding structure 3 so that the flexible surrounding structure 3 can pass through the first accommodation space 111. The space (or the step-like surrounding groove 100) is abutted on the first partial section 201 of the shaft body 20 in a limited manner. In addition, the second partial section 202 is connected to one end of the first partial section 201 and is accommodated in the second accommodation space 112, and the third partial section 203 is connected to the other end of the first partial section 201 and accommodated in Within the third accommodation space 113. In addition, the fourth partial section 204 is connected to the third partial section 203 and is accommodated in the fourth accommodation space 114, and the fifth partial section 205 is connected to the fourth partial section 204 and accommodated in the fifth container Inside the space 115. Furthermore, the sixth partial section 206 is connected to the second partial section 202 and is exposed outside the bearing body 10, and the seventh partial section 207 is connected to the fifth partial section 205 and is exposed outside the bearing body 10.

It is worth mentioning that, as shown in FIGS. 2, 4 and 5, the bearing body 10 has a first surrounding inner surface 1001 located in the first accommodation space 111, and a bearing body 10 located in the second accommodation space 112. A second surrounding inner surface 1002, a third surrounding inner surface 1003 located in the third accommodation space 113, a fourth surrounding inner surface 1004 located in the fourth accommodation space 114, and a fifth accommodation The fifth surrounding inner surface 1005 in the space 115. Furthermore, the first distance H1 between the first surrounding inner surface 1001 and the second surrounding inner surface 1002 will be greater than a cross-sectional radius r before the flexible surrounding structure 3 is compressed, and the first surrounding inner The second distance H2 between the surface 1001 and the third surrounding inner surface 1003 will be smaller than a cross-sectional diameter d before the flexible surrounding structure 3 is compressed.

For example, both the third surrounding inner surface 1003 and the fifth surrounding inner surface 1005 may be groove-free surfaces. In addition, the second diameter D2 of the second accommodating space 112 may be gradually reduced from the axial center entrance 100A toward the first accommodating space 111, so that the second surrounding inner surface 1002 may also be a tapered surface having an inclined surface. This facilitates embedding the flexible surrounding structure 3 in the step-like surrounding groove 100.

Therefore, in accordance with FIG. 2, FIG. 4, and FIG. 5, since the first distance H1 between the first surrounding inner surface 1001 and the second surrounding inner surface 1002 will be larger than that before the flexible surrounding structure 3 is compressed. The cross-sectional radius r, so when the flexible surrounding structure 3 is placed in the first containing space 111 (or in the step-like surrounding groove 100), the flexible surrounding structure 3 will not easily leave the first containing space 111. (Or stepped surrounding groove 100). In addition, since the second distance H2 between the first surrounding inner surface 1001 and the third surrounding inner surface 1003 will be smaller than the cross-sectional diameter d before the flexible surrounding structure 3 is compressed, when the shaft body 20 penetrates the through hole 11 and partially accommodated in the through hole 11, the flexible surrounding structure 3 can be closely abutted against the axis through the space limit of the first accommodation space 111 (or the step-like surrounding groove 100). The first partial section 201 of the main body 20 enables the shaft main body 20 to obtain an effective supporting effect, and prevents lubricant from leaking between the bearing body 10 and the shaft main body 20, thereby preventing oil leakage and dust. Double effect.

It is worth mentioning that, as shown in FIG. 2 and FIG. 4, since the flexible surrounding structure 3 is accommodated in the first accommodation space 111 (or embedded in the step-like surrounding groove 100), The present invention does not need to additionally set another O-ring on the sixth partial section 206, thereby increasing the use space of the surrounding area of the sixth partial section 206, which can effectively reduce the fan device Z and The overall thickness of its bearing assembly S.

For example, FIG. 6 is a schematic cross-sectional view of a second bearing structure of a bearing assembly according to an embodiment of the present invention. As shown in FIG. 6, the bearing body 10 has a plurality of first grooves 101, and the plurality of first grooves 101 are provided on the third surrounding inner surface 1003. In addition, the bearing body 10 has a plurality of second grooves 102, and the plurality of second grooves 102 are provided on the fifth surrounding inner surface 1005. It should be noted that the first groove 101 and the second groove 102 may be herringbone grooves or grooves of any shape, but the present invention is not limited thereto.

For example, FIG. 7 is a schematic cross-sectional view of a third bearing structure of a bearing assembly provided by one embodiment of the present invention. As shown in FIG. 7, the bearing body 10 may use only a plurality of first grooves 101 and omit the use of a plurality of second grooves 102, so the fifth surrounding inner surface 1005 may be a surface without grooves.

For example, FIG. 8 is a schematic cross-sectional view of a fourth bearing structure of a bearing assembly according to an embodiment of the present invention. As shown in FIG. 8, the bearing body 10 may use only the plurality of second grooves 102 and omit the use of the plurality of first grooves 101. Therefore, the third surrounding inner surface 1003 may be a surface without grooves.

It is worth mentioning that, in conjunction with FIG. 4 and FIG. 9, another embodiment of the present invention provides a fan device Z, which includes: a bearing assembly S and a cooling fan F. As shown in FIG. 4, as in the previous description, the bearing assembly S includes a bearing structure 1, an axial center structure 2, and a flexible surrounding structure 3. In addition, as shown in FIG. 9, the cooling fan F is sleeved on an end of the shaft body 20, and the type of the cooling fan F is not limited.

The beneficial effect of the present invention is that when the axis body 20 penetrates the through hole 11 and is partially accommodated in the through hole 11, the flexible surrounding structure 3 can pass through the first accommodation space 111 (or a stepped surrounding shape). The space of the groove 100) is limited to closely abut the first partial section 201 of the shaft body 20, so that the shaft body 20 can obtain an effective support effect, and the lubricant from the bearing body 10 and the shaft body can be avoided. Leaked between 20, to achieve the dual effects of oil leakage and dust.

Furthermore, since the flexible surrounding structure 3 is accommodated in the first accommodation space 111 (or embedded in the step-like surrounding groove 100), the present invention does not need to set an additional O The profile ring is on the sixth partial section 206, so as to increase the use space of the surrounding area of the sixth partial section 206, so that the overall thickness of the fan device Z and the bearing assembly S of the present invention can be effectively reduced.

The contents disclosed above are only the preferred and feasible embodiments of the present invention, and therefore do not limit the scope of patent application of the present invention. Therefore, any equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. Within the scope of the patent.

Claims (10)

    A bearing assembly includes: a bearing structure, the bearing structure having a bearing body and a through hole penetrating through the bearing body, wherein the through hole has a first accommodation space; The axial center structure has an axial center body, wherein the axial center body penetrates the through hole and is partially accommodated in the through hole; and a flexible surrounding structure, the flexible surrounding structure contains It is placed in the first accommodation space and is abutted between the bearing body and the shaft center body.         The bearing assembly according to claim 1, wherein the through hole has a second accommodation space and a third accommodation space, and the first accommodation space is communicated with the second accommodation space and the Between the third accommodation space, wherein the first accommodation space has a first diameter, the second accommodation space has a second diameter, and the third accommodation space has a third diameter, The first diameter of the first accommodation space is larger than the second diameter of the second accommodation space, and the second diameter of the second accommodation space is larger than the third accommodation space The third diameter.         The bearing assembly according to claim 1, wherein the bearing body has an axial inlet and an axial outlet, and the through hole has a second accommodation space, a third accommodation space, and a fourth accommodation. A storage space and a fifth accommodation space, the second accommodation space is communicated between the axis entrance and the first accommodation space, and the third accommodation space is communicated with the first accommodation space Space and the fourth accommodation space, the fourth accommodation space is communicated with the third accommodation space and the fifth accommodation space, and the fifth accommodation space is communicated with the axis exit And the fourth accommodation space, wherein the first accommodation space has a first diameter, the second accommodation space has a second diameter, and the third accommodation space has a third Diameter, the fourth receiving space has a fourth diameter, the fifth receiving space has a fifth diameter, the first diameter is larger than the second diameter, and the second diameter is larger than the third diameter Diameter, the third diameter is equal to the fifth diameter, and the third diameter is equal to the first diameter A diameter smaller than the fourth diameter.         The bearing assembly according to claim 1, wherein the shaft body has a first partial section, a second partial section, a third partial section, a fourth partial section, and a fifth partial section. Segment, a sixth partial segment, and a seventh partial segment, the first partial segment is accommodated in the first accommodation space and is surrounded and abutted by the flexible surrounding structure, the The second partial section is connected to one end of the first partial section and accommodated in the second accommodation space, and the third partial section is connected to the other end of the first partial section and accommodated in In the third accommodating space, the fourth partial section is connected to the third partial section and is accommodated in the fourth accommodating space, and the fifth partial section is connected to the first accommodating space. A four-part section is accommodated in the fifth accommodating space, the sixth part section is connected to the second part section and is exposed outside the bearing body, and the seventh part section A segment is connected to the fifth partial section and is exposed outside the bearing body.         The bearing assembly according to claim 1, wherein the bearing body has a first surrounding inner surface located in the first accommodation space, and a second surrounding shape located in the second accommodation space. An inner surface, a third surrounding inner surface located in the third accommodation space, a fourth surrounding inner surface located in the fourth accommodation space, and an inner surface located in the fifth accommodation space A fifth surrounding inner surface, a distance between the first surrounding inner surface and the second surrounding inner surface being greater than a cross-sectional radius before the flexible surrounding structure is compressed, and the first surrounding The distance between the inner surface of the shape and the third inner surface of the shape is smaller than a cross-sectional diameter before the flexible surrounding structure is compressed, wherein the bearing body has a plurality of first grooves, and a plurality of The first groove is provided on the third surrounding inner surface, wherein the bearing body has a plurality of second grooves, and the plurality of second grooves are provided on the fifth surrounding inner surface. on.         A bearing assembly includes: a bearing structure, the bearing structure having a bearing body and a through hole penetrating through the bearing body, wherein the bearing body has a stepped type arranged in a surrounding manner in the through hole; A surrounding groove; an axis structure having an axis body passing through the through hole; and a flexible surrounding structure embedded in the stepped type The surrounding groove is tightly abutted between the bearing body and the shaft center body.         A fan device includes a bearing assembly including a bearing structure, the bearing structure having a bearing body and a through hole penetrating the bearing body, wherein the through hole has a first An accommodation space; an axis structure having an axis body, wherein the axis body penetrates the through hole and is partially accommodated in the through hole; and a flexible surrounding A structure in which the flexibility is housed in the first accommodating space around the structure and is abutted between the bearing body and the shaft body; and a cooling fan, the cooling fan is sleeved on The shaft center body.         The fan device according to claim 7, wherein the bearing body has a shaft inlet and a shaft outlet, and the through hole has a second accommodation space, a third accommodation space, and a fourth accommodation. A storage space and a fifth accommodation space, the second accommodation space is communicated between the axis entrance and the first accommodation space, and the third accommodation space is communicated with the first accommodation space Space and the fourth accommodation space, the fourth accommodation space is communicated with the third accommodation space and the fifth accommodation space, and the fifth accommodation space is communicated with the axis exit And the fourth accommodation space, wherein the first accommodation space has a first diameter, the second accommodation space has a second diameter, and the third accommodation space has a third Diameter, the fourth receiving space has a fourth diameter, the fifth receiving space has a fifth diameter, the first diameter is larger than the second diameter, and the second diameter is larger than the third diameter Diameter, the third diameter is equal to the fifth diameter, and the third diameter is equal to the first diameter A diameter smaller than the fourth diameter.         The fan device according to claim 7, wherein the shaft body has a first partial section, a second partial section, a third partial section, a fourth partial section, and a fifth partial section. Segment, a sixth partial segment, and a seventh partial segment, the first partial segment is accommodated in the first accommodation space and is surrounded and abutted by the flexible surrounding structure, the The second partial section is connected to one end of the first partial section and accommodated in the second accommodation space, and the third partial section is connected to the other end of the first partial section and accommodated in In the third accommodating space, the fourth partial section is connected to the third partial section and is accommodated in the fourth accommodating space, and the fifth partial section is connected to the first accommodating space. A four-part section is accommodated in the fifth accommodating space, the sixth part section is connected to the second part section and is exposed outside the bearing body, and the seventh part section A segment is connected to the fifth partial section and is exposed outside the bearing body.         The fan device according to claim 7, wherein the bearing body has a first surrounding inner surface located in the first accommodation space, and a second surrounding shape located in the second accommodation space. An inner surface, a third surrounding inner surface located in the third accommodation space, a fourth surrounding inner surface located in the fourth accommodation space, and an inner surface located in the fifth accommodation space A fifth surrounding inner surface, a distance between the first surrounding inner surface and the second surrounding inner surface being greater than a cross-sectional radius before the flexible surrounding structure is compressed, and the first surrounding The distance between the inner surface of the shape and the third inner surface of the shape is smaller than a cross-sectional diameter before the flexible surrounding structure is compressed, wherein the bearing body has a plurality of first grooves, and a plurality of The first groove is provided on the third surrounding inner surface, wherein the bearing body has a plurality of second grooves, and the plurality of second grooves are provided on the fifth surrounding inner surface. on.