TW202206713A - Bearing system and motor including the same - Google Patents

Abstract

A bearing system and motor including the same are provided to improve the dynamic pressure of prior bearing system. The bearing system includes a shaft tube having a first opening and a second opening, a clapboard locating in the shaft tube, a bearing locating between the first opening and the clapboard, a cover locating between the second opening and the clapboard, and a rotating member having an outer protrusion connected to a shaft and located between the clapboard and the cover. The outer diameter of the outer protrusion is larger than the outer diameter of the bearing. The bearing system can form a dynamic pressure between the outer protrusion and the clapboard when the rotating member rotates.

Description

Bearing system and motor having the same

The present invention relates to a motor component, especially a bearing system and a motor having the bearing system.

Please refer to FIG. 1, which is a conventional fluid dynamic pressure bearing device 9. The conventional fluid dynamic pressure bearing device 9 has a sealing portion 91 located in an outer member 92, and a shaft portion 93 penetrates the sealing portion 91. The first end 931 of the shaft portion 93 is located in the outer member 92 , and the second end 932 of the shaft portion 93 protrudes out of the outer member 92 . A sleeve portion 94 is connected to the first end 931 of the shaft portion 93 to rotate with the shaft portion 93 ; wherein, the gap between the first surface 941 of the sleeve portion 94 and the sealing portion 91 is close to the shaft portion When the part 93 rotates, an oil film is formed, and the gap between the second surface 942 of the sleeve part 94 and the outer member 92 forms another oil film when it rotates, so that the dynamic pressure is generated by the oil film in the gap to reduce The friction between the components achieves the effect of reducing operating noise and vibration. An embodiment similar to the conventional hydrodynamic bearing device 9 has been disclosed in ROC Patent No. 202016443.

However, when the load is large, the above-mentioned conventional fluid dynamic pressure bearing device 9 may have insufficient dynamic pressure, so the above-mentioned conventional fluid dynamic pressure bearing device 9 cannot be applied to a motor with a relatively high load, so it is still There is a need for improvement.

In order to solve the above-mentioned problems, the purpose of the present invention is to provide a bearing system, which can still have sufficient dynamic pressure to support the rotating member under high load conditions, and can be suitable for motors with larger volumes or higher loads.

Another object of the present invention is to provide a bearing system that can improve the smoothness of circulation of lubricating oil.

Yet another object of the present invention is to provide a bearing system that prevents oil leakage.

Yet another object of the present invention is to provide a motor having the bearing system.

The directional or similar terms used throughout this disclosure, such as "front", "back", "left", "right", "top (top)", "bottom (bottom)", "inside", "outside" , "side surface", etc., mainly refer to the directions of the attached drawings, each directionality or its similar terms are only used to assist the description and understanding of the various embodiments of the present invention, and are not intended to limit the present invention.

The use of the quantifier "a" or "an" for the elements and components described throughout the present invention is only for convenience and provides a general meaning of the scope of the present invention; in the present invention, it should be construed as including one or at least one, and a single The concept of also includes the plural case unless it is obvious that it means otherwise.

Similar terms such as "combined", "combined" or "assembled" mentioned in the whole text of the present invention mainly include the components that can be separated without destroying the components after the connection, or the components can not be separated after being connected, which are common knowledge in the field. It can be selected according to the material of the components to be connected or the assembly requirements.

The bearing system of the present invention comprises: an axle tube with a first opening and a second opening; a partition plate located in the axle tube; a bearing located between the first opening and the partition plate, and the bearing has A bearing inner diameter and a bearing outer diameter; a cover plate located between the second opening and the partition plate; and a rotating member having a rotating shaft passing through the bearing and the partition plate, and an outer convex portion connecting the rotating shaft and Located between the partition plate and the cover plate, the outer convex portion has an outer diameter of the outer convex portion, the outer diameter of the outer convex portion is larger than the outer diameter of the bearing, and the outer convex portion can be formed between the partition plate during rotation A dynamic pressure gap.

The motor of the present invention comprises: a base; a bearing system as described above, the axle tube is combined with the base, the rotating shaft protrudes out of the first opening of the axle tube and is combined with a wheel hub, the wheel hub is combined with a magnetic member ; and a stator, which is arranged on the outer circumference of the shaft tube and is opposite to the magnetic piece.

Accordingly, in the bearing system of the present invention, by setting the outer convex portion of the rotating member to be wider than the bearing, the larger area of the outer convex portion can provide a larger dynamic pressure effect, so that the bearing system can be It can still have sufficient dynamic pressure to support the rotating part under high load conditions, so that it can be used in motors with larger volumes or higher loads, and ensure that the bearing system or motor is not prone to noise and vibration problems when operating. It has the effect of improving the quality of the bearing system or motor.

Wherein, the partition plate has a first surface and a second surface that are axially opposite to each other, the outer convex portion has a first end surface and a second end surface that are axially opposite to each other, and the first end surface of the outer convex portion can face the At least one of the second surface of the separator, the first end surface and the second surface may be provided with several dynamic pressure grooves. In this way, it has the effect of further enhancing the dynamic pressure effect generated when the bearing system operates.

The cover plate has an inner end surface and an outer end surface that are axially opposite to each other, the outer convex portion has a first end surface and a second end surface that are axially opposite to each other, and the second end surface of the outer convex portion can face the cover plate. At least one of the second end surface and the inner end surface can be provided with several dynamic pressure grooves. In this way, it has the effect of further enhancing the dynamic pressure effect generated when the bearing system operates.

Wherein, the plurality of dynamic pressure grooves may be disposed on the second end surface of the outer convex portion, and the cover plate may have a groove communicating with the plurality of dynamic pressure grooves on the second end surface. In this way, the groove can form an oil storage space, so that the lubricating oil can continuously and smoothly circulate in the plurality of dynamic pressure grooves on the second end surface, and has the effect of increasing the dynamic pressure.

Wherein, preferably, a plurality of dynamic pressure grooves are respectively provided on the first end surface and the second end surface of the outer convex portion. In this way, it has the functions of improving the dynamic pressure effect and the processing convenience of the dynamic pressure groove.

Wherein, the shaft passes through a through hole of the partition plate, the through hole has a through hole diameter, and the through hole diameter can be less than or equal to half of the sum of the outer diameter of the bearing and the inner diameter of the bearing. In this way, the perforation can be prevented from being too large, ensuring that the partition plate can have a sufficient area to generate a dynamic pressure sufficient to reach a predetermined ideal value between the baffle plate and the outer convex portion, and has the effect of increasing the dynamic pressure.

Wherein, the partition plate and the shaft tube can be integrally formed and connected, and an inner wall of the partition plate connected to the shaft tube can have an annular groove, and the annular groove can communicate with the dynamic pressure gap. In this way, the annular groove can be used to maintain the pressure gradient of the dynamic pressure between the protruding portion and the partition plate, thereby improving the rotational stability and motor performance under high load conditions.

Wherein, the baffle plate may not be integrally formed and connected with the shaft tube, the baffle plate has a first surface and a second surface opposite to the axial direction, and the first surface of the baffle plate can abut against the inner wall of the shaft tube. An abutting portion, the second surface of the partition plate may face the second opening, the partition plate may have an extension wall connected to the second surface, and the cover plate and the convex portion may be located in the extension wall. In this way, it has the effect of improving the convenience of assembly.

Wherein, a ring groove may be formed where the extension wall is connected to the second surface. In this way, the annular groove can be used to maintain the pressure gradient of the dynamic pressure between the protruding portion and the partition plate, thereby improving the rotational stability and motor performance under high load conditions.

Wherein, the protruding portion can be combined with the rotating shaft by laser welding. In this way, it has the effect of improving the bonding stability.

Wherein, the cover plate can be combined with the shaft tube by laser welding. In this way, it has the effect of improving the bonding stability.

The bearing system may further include a positioning ring, the positioning ring may abut the top surface of the bearing and combine with the shaft tube, the bearing may be located between the positioning ring and the partition plate, the rotating shaft may penetrate the positioning ring and protrude extends beyond the first opening. In this way, it has the effect of improving the positioning effect of the bearing.

Wherein, the positioning ring can be plated with a composite metal coating, and the positioning ring can be combined with the shaft tube by laser welding. In this way, it has the effect of improving the bonding stability.

Wherein, the rotating shaft can pass through a through hole of the positioning ring and a shaft hole of the bearing, and the through hole has a through hole width, and the through hole width can be larger than the inner diameter of the bearing. In this way, it can be ensured that the rotating shaft does not rub against the positioning ring, which has the effect of not affecting the rotational smoothness of the rotating shaft.

Wherein, the bearing may have a guide inclined surface connecting the shaft hole and the top surface, and the diameter of the through hole may be smaller than the diameter of the connection between the guide inclined surface and the top surface. In this way, the positioning ring can block the lubricating oil flowing out along the guiding inclined surface, and has the effect of preventing the leakage of the lubricating oil.

Wherein, the positioning ring may have an anti-leakage inclined surface, the anti-leakage inclined surface may be adjacent to the through hole and face the bearing, and an oil-breaking space may be formed between the anti-leakage inclined surface and the top surface of the bearing. In this way, when the lubricating oil flows to the top surface of the bearing along the guiding inclined surface, it can flow into the oil-cutting space continuously, and is not easy to flow out from the piercing opening of the positioning ring, which has the effect of preventing the leakage of lubricating oil.

Wherein, the stator has a minimum inner diameter of the stator, and the outer diameter of the outer convex portion may be larger than the minimum inner diameter of the stator. In this way, it has the effect of increasing the dynamic pressure and is suitable for motors with larger volumes or higher loads.

Wherein, the shaft tube may have a small diameter portion connected to a large diameter portion, an outer wall of the shaft tube may form a shoulder at the adjoining portion of the small diameter portion and the large diameter portion, and the stator may abut against the shoulder portion. In this way, it has the effect of improving the convenience of assembly.

Wherein, the shaft tube can be plated with a composite metal coating, and the shaft tube can be combined with the base by laser welding. In this way, it has the effect of improving the bonding stability.

In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the preferred embodiments of the present invention are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings:

Please refer to FIG. 2, which is the first embodiment of the bearing system R of the present invention, which includes a shaft tube 1, a partition plate 2, a bearing 3, a cover plate 4 and a rotating member 5. The partition plate 2 , the bearing 3 and the cover plate 4 are all located in the axle tube 1 , and a part of the rotating member 5 is located in the axle tube 1 and can rotate relative to the axle tube 1 .

The shaft tube 1 has a first opening 11 and a second opening 12 . The first opening 11 and the second opening 12 can be axially opposite to each other, so that the above-mentioned components can be loaded into the shaft tube 1 from both ends. The outside of the shaft tube 1 can be combined with components such as a base, a coil set or a circuit board, so the shape of the shaft tube 1 can be adjusted according to usage requirements. For example, but not limitation, the shaft tube 1 of this embodiment may have a small diameter portion 1a connected to a large diameter portion 1b, the small diameter portion 1a has a first chamber S1, and the large diameter portion 1b has a first chamber S1. The second chamber S2. The inner diameter of the small diameter portion 1a may be smaller than the inner diameter of the large diameter portion 1b, so that the second chamber S2 is wider than the first chamber S1; the outer diameter of the small diameter portion 1a is also smaller than the larger diameter The outer diameter of the diameter portion 1b enables the outer wall W1 of the shaft tube 1 to form a shoulder portion 13 where the small diameter portion 1a and the large diameter portion 1b adjoin.

Referring to Figures 2 and 3, the separator 2 is located in the shaft tube 1 , and the separator 2 can be integrally connected with the shaft tube 1 , or assembled and fixed at a predetermined position in the shaft tube 1 . The separator 2 may have a first surface 21 and a second surface 22 axially opposite to each other, the first surface 21 may face the first opening 11 of the shaft tube 1 , and the second surface 22 may face the shaft tube 1 of the second opening 12 . The partition 2 is substantially located at the adjoining position of the small diameter portion 1a and the large diameter portion 1b; that is, the first chamber S1 may be located between the first surface 21 and the first opening 11, the second The chamber S2 may be located between the second surface 22 and the second opening 12 . The separator 2 may have a through hole 23 having a through hole diameter D1 (marked in FIG. 4 ). The separator 2 may have an annular groove 24 located on the outer circumference of the second surface 22 ; when the separator 2 is integrally connected with the shaft tube 1 , the annular groove 24 may be positioned on the second face 22 to connect the shaft tube 1 Inner wall W2.

Referring to Figures 2 and 4, the bearing 3 can be inserted into the first chamber S1 through the first opening 11 of the shaft tube 1, so that the bearing 3 can be located between the first opening 11 and the partition 2 between. The bearing 3 has a top surface 31 facing the first opening 11 , and a bottom surface 32 abutting against the first surface 21 of the partition plate 2 . The bearing 3 has a shaft hole 33, so that the bearing 3 has a bearing inner diameter D2 and a bearing outer diameter D3. The shaft hole 33 of the bearing 3 is axially opposite to the through hole 23 of the partition plate 2; in this embodiment, the through hole diameter D1 can be selected to be slightly larger than the bearing inner diameter D2, and can be smaller than or equal to the bearing outer diameter D3 and The inner diameter D2 of the bearing is half of the sum, so that the perforation 23 of the partition plate 2 will not be too large.

Referring to Figures 3 and 4, the cover plate 4 can be inserted into the second chamber S2 through the second opening 12 of the shaft tube 1, so that the cover plate 4 can be located between the second opening 12 and the partition between plate 2. The cover plate 4 has an inner end surface 41 and an outer end surface 42 that are axially opposite to each other. The inner end surface 41 faces the second surface 22 of the partition plate 2 and maintains a predetermined distance from the second surface 22 ; the outer end surface 42 is It can be located at the second opening 12 , so that the bottom end of the cover plate 4 can be flush with the bottom end of the shaft tube 1 , or be slightly retracted into the bottom end of the shaft tube 1 . The cover plate 4 can be tightly fitted with the inner wall W2 of the shaft tube 1 , or preferably combined with the shaft tube 1 by laser welding around the circumference of the outer end surface 42 , so as to stably position the cover plate 4 . The cover plate 4 may further have a groove 43 facing the partition plate 2 , and the groove 43 is located substantially at the center of the inner end surface 41 so as to be axially opposite to the through hole 23 of the partition plate 2 .

Referring to Figures 2 and 4, the rotating member 5 has a rotating shaft 51 passing through the shaft hole 33 of the bearing 3 and the through hole 23 of the partition 2. One end of the rotating shaft 51 is located in the shaft tube 1, and the rotating shaft 51 The other end of the shaft protrudes out of the first opening 11 of the axle tube 1 and can be combined with a hub 52 , and the inner surface of the hub 52 is combined with a magnetic member 53 . In addition, the rotating member 5 also has an outer convex portion 54 connected to one end of the rotating shaft 51 inside the shaft tube 1 , so that the outer convex portion 54 can rotate synchronously with the rotating shaft 51 . The protruding portion 54 can be integrally formed and connected with the rotating shaft 51 , or can be assembled and fixed at a predetermined position on the rotating shaft 51 . Preferably, the protruding portion 54 can be combined with the rotating shaft 51 by laser welding. The protruding portion 54 is located between the partition plate 2 and the cover plate 4 , and the protruding portion 54 extends radially outward with the rotating shaft 51 as the center.

More specifically, please refer to FIGS. 3 and 4 , the protruding portion 54 has a first end face 541 and a second end face 542 that are axially opposite to each other, and the first end face 541 of the protruding portion 54 faces the spacer On the second surface 22 of the plate 2 , the second end surface 542 of the convex portion 54 faces the inner end surface 41 of the cover plate 4 . In addition, the outer convex portion 54 has an outer convex portion outer diameter D4, and the outer convex portion outer diameter D4 is larger than the bearing outer diameter D3, and the outer convex portion 54 can rotate with the rotating shaft 51 and the partition 2 . A dynamic pressure gap G is formed between them. Wherein, in order to further enhance the dynamic pressure effect generated by the operation of the bearing system R, at least one of the first end surface 541 of the outer convex portion 54 and the second surface 22 of the partition plate 2 can also be selected. There are several dynamic pressure grooves V; that is, the plurality of dynamic pressure grooves V can be set on the first end surface 541 of the outer convex portion 54 or the second surface 22 of the partition plate 2, and it is preferable to set them on the The first end surface 541 of the outer convex portion 54 is easy to process, or both of them may be provided with several dynamic pressure grooves V respectively. The type of the dynamic pressure groove V is not limited in the present invention, and can be, for example, a radial arc groove, or a herringbone groove as shown in the figure, which can be adjusted according to the needs of use.

On the other hand, in this embodiment, another dynamic pressure gap G can also be formed between the outer convex portion 54 and the cover plate 4 when the outer convex portion 54 rotates, so that the upper and lower ends of the outer convex portion 54 can generate dynamic pressure. The effect of pressure support. Similarly, at least one of the second end surface 542 of the outer convex portion 54 and the inner end surface 41 of the cover plate 4 may be provided with a plurality of dynamic pressure grooves V, and when only the plurality of dynamic pressure grooves V are provided. When it is installed in one of them, it is preferable to choose the second end surface 542 of the outer convex portion 54 for processing, but it is not limited thereto. In particular, when the second end surface 542 of the convex portion 54 has the plurality of dynamic pressure grooves V, the plurality of dynamic pressure grooves V on the second end surface 542 can be connected to the grooves 43 of the cover plate 4 Pass.

Please refer to Figures 2 and 4 again, the bearing system may further include a positioning ring 6, the positioning ring 6 can abut the top surface 31 of the bearing 3 and be combined with the shaft tube 1, so that the bearing 3 can be stably arranged between the positioning ring 6 and the partition 2 . In this embodiment, the positioning ring 6 can be loaded into the first chamber S1 through the first opening 11 of the shaft tube 1, and the surface of the positioning ring 6 can be plated with a composite metal coating such as nickel or tin, The positioning ring 6 can be stably combined with the inner wall W2 of the shaft tube 1 by laser welding. The positioning ring 6 further has a through hole 61 , and the through hole 61 is axially opposite to the shaft hole 33 of the bearing 3 for the shaft 51 to pass through.

Referring to Figures 4 and 5, when the above-mentioned bearing system R is applied to a motor, the outer wall W1 of the shaft tube 1 can be combined with a base 7 by the large diameter portion 1b; wherein, the shaft tube 1 The outer wall W1 can also be plated with a composite metal coating, so as to be firmly combined with the base 7 by laser welding. The motor further has a stator 8. The stator 8 can have a circuit board 81 and a coil set 82. The circuit board 81 can be assembled on the base 7 and located on the outer periphery of the large diameter portion 1b. The coil set 82 is It can abut against the shoulder 13 of the shaft tube 1 and is spaced apart from the magnetic member 53 of the rotating member 5 by a magnetic induction air gap, and both the first chamber S1 and the second chamber S2 of the shaft tube 1 are lubricated Oil.

In this way, when the stator 8 drives the rotating member 5 to rotate, the lubricating oil located in the dynamic pressure gap G between the convex portion 54 and the partition plate 2 and the lubricating oil located between the convex portion 54 and the cover plate 4 The lubricating oil in the dynamic pressure gap G can generate an oil film to reduce the friction torque of the convex portion 54 and maintain the dynamic pressure gap G by dynamic pressure to prevent the convex portion 54 from colliding with the partition plate 2 . Or the cover plate 4 and restraining the axial displacement of the rotating shaft 51 can keep the integral rotating member 5 rotating smoothly and stably.

In particular, since the outer diameter D4 of the outer convex portion of the rotating member 5 is larger than the outer diameter D3 of the bearing, the bearing system R of this embodiment may not be limited by the space of the first chamber S1, and the outer diameter D3 of the larger area is not limited. The convex portion 54 provides a larger dynamic pressure effect, so that the bearing system R can still have sufficient dynamic pressure to support the rotating member 5 under a high load state, so that it can be used in a motor with a larger volume or a higher load.

In addition, in this embodiment, the through hole 23 of the partition plate 2 is not too large to ensure that the partition plate 2 can have a sufficient area to generate a dynamic pressure sufficient to achieve a predetermined ideal value between the partition plate 2 and the convex portion 54 . In the embodiment in which the separator 2 has the annular groove 24 , the annular groove 24 can communicate with the dynamic pressure gap G to maintain the pressure gradient of the dynamic pressure between the convex portion 54 and the separator 2 , which helps to improve the rotational stability and motor performance under high load conditions. In addition, when the cover plate 4 has the groove 43, the groove 43 can also form an oil storage space, so that the lubricating oil can continuously and smoothly circulate in the plurality of dynamic pressure grooves V on the second end surface 542, It helps to improve the robustness of the oil film between the convex portion 54 and the cover plate 4 to increase the dynamic pressure.

Please refer to Figures 6 and 7, which are the second embodiment of the bearing system R and the motor of the present invention. In this embodiment, the inner wall W2 of the shaft tube 1 can be between the small diameter portion 1a and the large diameter portion 1a. An abutting portion 14 is formed at the adjoining portion of the portion 1b. The baffle 2 can be assembled and fixed into the shaft tube 1; that is, the baffle 2 can be inserted into the second chamber S2 through the second opening 12 of the shaft tube 1, and the baffle 2 can be assembled by the first One surface 21 abuts against the abutting portion 14 . The partition 2 may further have an extension wall 25 connected to the outer periphery of the second surface 22 , the extension wall 25 may extend toward the second opening 12 , and preferably the bottom end of the extension wall 25 may be connected to the shaft tube The bottom end of 1 is flush, so that even if the first surface 21 of the partition 2 is abutted by the bottom surface 32 of the bearing 3 , the partition 2 is not easily displaced. The cover plate 4 and the protruding portion 54 are both located in the extending wall 25 , and the annular groove 24 in this embodiment may be located where the extending wall 25 is connected to the second surface 22 .

Referring to Figures 6, 7, and 8, on the other hand, the bearing 3 of this embodiment may have a guide inclined surface 34 connected to the shaft hole 33 and the top surface 31, and the guide inclined surface 34 is connected to the top surface 31 There is a diameter and width D5. The through hole 61 of the positioning ring 6 has a through hole width D6. In this embodiment, the through hole width D6 can be selected to be larger than the bearing inner diameter D2, so that the rotating shaft 51 will not rub against the positioning ring 6, and the through hole diameter D6 can be selected to be larger than the bearing inner diameter D2. The width D6 is preferably smaller than the diameter D5 of the connection between the guide slope 34 and the top surface 31 , so that the positioning ring 6 can stop the lubricating oil flowing out along the guide slope 34 . In addition, the positioning ring 6 can have a leak-proof inclined surface 62, the leak-proof inclined surface 62 is adjacent to the through hole 61 and faces the bearing 3, so as to form a break between the leak-proof inclined surface 62 and the top surface 31 of the bearing 3 Oil space S3. In this way, when the lubricating oil flows to the top surface 31 of the bearing 3 along the guiding inclined surface 34 , it can flow into the oil-cutting space S3 continuously, and is not easy to flow out from the through hole 61 of the positioning ring 6 .

Please refer to FIG. 9, which is the third embodiment of the bearing system R and the motor of the present invention. In this embodiment, the outer diameter D4 of the outer convex portion of the rotating member 5 can be changed by changing the shape of the shaft tube 1. It is further expanded and can be larger than the stator minimum inner diameter D7 of the stator 8; for example, the stator minimum inner diameter D7 of this embodiment is the inner diameter of the coil set 82, but not limited to this, different types The state of the stator 8 may be different at the stator minimum inner diameter D7. In this way, the bearing system R of the present embodiment can further enhance the dynamic pressure effect generated by the larger area of the convex portion 54, so as to be suitable for a motor with a larger volume or a higher load.

To sum up, in the bearing system of the present invention, by setting the outer convex portion of the rotating member to be wider than the bearing, the larger area of the outer convex portion can provide a larger dynamic pressure effect, so that the bearing can be The system can still have sufficient dynamic pressure to support the rotating part under high load conditions, so that it can be used in motors with larger volumes or higher loads, and ensure that the bearing system or motor is not easy to generate noise and vibration during operation. It has the effect of improving the quality of the bearing system or motor.

Although the present invention has been disclosed by the above-mentioned preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications relative to the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the patent application attached hereto.

﹝this invention﹞ 1: Axle tube 1a: Small diameter section 1b: Large diameter part 11: The first opening 12: Second opening 13: Shoulder 14: Abutment 2: Partition 21: The first side 22: The second side 23: Perforation 24: Ring groove 25: Extension Wall 3: Bearing 31: Top surface 32: Underside 33: Shaft hole 34: Guide bevel 4: Cover 41: inner end face 42: Outer end face 43: Grooves 5: Turning parts 51: Spindle 52: Wheels 53: Magnetic parts 54: Outer convex part 541: First end face 542: Second end face 6: Positioning ring 61: Piercing 62: Leak-proof bevel 7: Pedestal 8: Stator 81: circuit board 82: Coil set D1: perforation aperture D2: Bearing inner diameter D3: Bearing outer diameter D4: Outer diameter of the outer convex part D5: diameter and width D6: wear diameter wide D7: Minimum inner diameter of stator G: Dynamic pressure clearance R: Bearing system S1: First containment room S2: The second chamber S3: oil cut space V: Dynamic pressure groove W1: outer wall W2: inner wall ﹝Accustomed ﹞ 9: Fluid dynamic pressure bearing device 91: Sealing part 92: Outer member 93: Shaft 931: First End 932: Second End 94: Sleeve 941: The first side 942: The second side

[FIG. 1] A diagram of a conventional fluid dynamic bearing device. [FIG. 2] An exploded perspective view of the bearing system according to the first embodiment of the present invention. [FIG. 3] An exploded perspective view of a part of the bearing system of the first embodiment of the present invention. [FIG. 4] A combined cross-sectional view of the motor according to the first embodiment of the present invention. [Fig. 5] As shown in Fig. 4, an enlarged view of a part of the structure at A. [FIG. 6] An exploded perspective view of the bearing system according to the second embodiment of the present invention. [FIG. 7] A combined cross-sectional view of a motor according to a second embodiment of the present invention. [Fig. 8] As shown in Fig. 7, an enlarged view of a part of the structure at B. [FIG. 9] A combined cross-sectional view of a motor according to a third embodiment of the present invention.

1: Axle tube

1a: Small diameter section

1b: Large diameter part

11: The first opening

12: Second opening

13: Shoulder

2: Partition

21: The first side

22: The second side

23: Perforation

24: Ring groove

3: Bearing

31: Top surface

32: Underside

33: Shaft hole

4: Cover

41: inner end face

42: Outer end face

43: Grooves

5: Turning parts

51: Spindle

52: Wheels

53: Magnetic parts

54: Outer convex part

541: First end face

542: Second end face

6: Positioning ring

61: Piercing

7: Pedestal

8: Stator

81: circuit board

82: Coil set

D1: perforation aperture

D2: Bearing inner diameter

D3: Bearing outer diameter

D4: Outer diameter of outer convex part

G: Dynamic pressure clearance

R: Bearing system

S1: First containment room

S2: The second chamber

V: Dynamic pressure groove

W1: outer wall

W2: inner wall

Claims (20)

A bearing system comprising: a shaft tube with a first opening and a second opening; a baffle, located in the shaft tube; a bearing, located between the first opening and the partition, the bearing has a bearing inner diameter and a bearing outer diameter; a cover plate located between the second opening and the partition; and A rotating member has a rotating shaft passing through the bearing and the partition plate, an outer convex portion is connected to the rotating shaft and is located between the partition plate and the cover plate, the outer convex portion has an outer diameter of the outer convex portion, and the outer convex portion The outer diameter is larger than the outer diameter of the bearing, and a dynamic pressure gap can be formed between the outer convex portion and the partition plate during rotation. The bearing system of claim 1, wherein the partition plate has a first surface and a second surface that are axially opposite to each other, the convex portion has a first end surface and a second end surface that are axially opposite to each other, and the convex portion has a first end surface and a second end surface that are axially opposite to each other. The first end face of the part faces the second face of the separator, and at least one of the first end face and the second face is provided with several dynamic pressure grooves. The bearing system as claimed in claim 1 or 2, wherein the cover plate has an inner end surface and an outer end surface that are axially opposite to each other, the outer convex portion has a first end surface and a second end surface that are axially opposite to each other, and the outer convex portion has an axially opposed first end surface and a second end surface. The second end face of the part faces the inner end face of the cover plate, and at least one of the second end face and the inner end face is provided with several dynamic pressure grooves. The bearing system of claim 3, wherein the plurality of dynamic pressure grooves are disposed on the second end surface of the outer convex portion, and the cover plate has a groove communicating with the plurality of dynamic pressure grooves on the second end surface. The bearing system of claim 1, wherein the partition plate has a first surface and a second surface that are axially opposed, the cover plate has an inner end surface and an outer end surface that are axially opposed, and the outer convex portion has a shaft To an opposite first end face and a second end face, the first end face of the outer convex portion faces the second face of the partition plate, the second end face of the outer convex portion faces the inner end face of the cover plate, and the outer convex portion faces the inner end face of the cover plate. The first end face and the second end face are respectively provided with several dynamic pressure grooves. The bearing system of claim 1, wherein the shaft passes through a through hole of the partition plate, the through hole has a through hole diameter, and the through hole diameter is less than or equal to half of the sum of the outer diameter of the bearing and the inner diameter of the bearing. The bearing system of claim 1, wherein the partition plate is integrally connected with the axle tube, and an inner wall of the partition plate connected to the axle tube has an annular groove, and the annular groove communicates with the dynamic pressure gap. The bearing system of claim 1, wherein the separator is not integrally formed and connected to the shaft tube, the separator has a first face and a second face that are axially opposite to each other, and the first face of the separator abuts An abutting portion of the inner wall of the shaft tube, the second surface of the partition plate faces the second opening, the partition plate has an extension wall connected to the second surface, the cover plate and the outer convex portion are located on the extension wall Inside. The bearing system of claim 8, wherein the extending wall has an annular groove connected to the second surface. The bearing system of claim 1, wherein the outer convex portion is combined with the rotating shaft by laser welding. The bearing system of claim 1, wherein the cover plate is laser welded to the axle tube. The bearing system of claim 1 further comprises a positioning ring, the positioning ring abuts against the top surface of the bearing and is combined with the shaft tube, the bearing is located between the positioning ring and the partition plate, the rotating shaft penetrates the positioning ring and protruding beyond the first opening. The bearing system of claim 12, wherein the locating ring is coated with a composite metal coating, and the locating ring is laser welded to the shaft tube. The bearing system of claim 12, wherein the rotating shaft penetrates a through hole of the positioning ring and a shaft hole of the bearing, the through hole has a through hole width, and the through hole width is larger than the inner diameter of the bearing. The bearing system of claim 14, wherein the bearing has a guide inclined surface connecting the shaft hole and the top surface, and the diameter of the through hole is smaller than the diameter of the connection between the guide inclined surface and the top surface. The bearing system of claim 14, wherein the locating ring has an anti-leakage inclined surface, the anti-leakage inclined surface is adjacent to the through hole and faces the bearing, and an oil-cut space is formed between the anti-leakage inclined surface and the top surface of the bearing. A motor comprising: a base; The bearing system of any one of claims 1 to 16, wherein the axle tube is combined with the base, the rotating shaft protrudes through the first opening of the axle tube and is combined with a hub, and the hub is combined with a magnetic member; and The stator is arranged on the outer circumference of the shaft tube and is opposite to the magnetic member. The motor of claim 17, wherein the stator has a minimum inner diameter of the stator, and the outer diameter of the outer protrusion is larger than the minimum inner diameter of the stator. The motor of claim 17, wherein the shaft tube has a small-diameter portion connected to a large-diameter portion, an outer wall of the shaft tube forms a shoulder where the small-diameter portion and the large-diameter portion abut, and the stator abuts against the large-diameter portion. shoulders. The motor of claim 17, wherein the shaft tube is plated with a composite metal coating, the shaft tube being laser welded to the base.

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