Dynamic pressure bearing and motor and fan device using same

Abstract

A dynamic pressure bearing and a motor and a fan device using the same are used for solving the problem that an existing dynamic pressure bearing is prone to generating noise or a bottom cover is abraded. The dynamic pressure bearing comprises a sleeve; the sleeve is sealed by a bottom cover; the bottom cover is provided with a base body arranged at the outer end; the inner end of the bottom cover is provided with a first protruding part and a peripheral concave part which is arranged on the periphery of the first protruding part in a surrounding mode, and the height of the first protruding part is larger than that of the peripheral concave part. The positioning piece is provided with a positioning hole; the bearing is provided with a shaft hole communicated with the positioning hole; a rotating shaft is rotatably arranged in the positioning hole and the shaft hole in a penetrating manner; and the movable pressing plate is arranged between the bottom cover and the positioning piece and is fixedly connected with the rotating shaft, and the movable pressing plate is aligned with the first protruding part in the axial direction. According to the utility model, the effect of reducing friction between the movable pressing plate and the bottom cover can be achieved.

Description

Technical Field

[0001] The utility model relates to a bearing structure, in particular to a dynamic pressure bearing and a motor and a fan device having the dynamic pressure bearing. Background Art

[0002] The existing hydrodynamic bearing generates a hydraulic support force through the interaction between a dynamic pressure plate inside a sleeve and the lubricating fluid. When a rotating shaft drives the dynamic pressure plate to rotate synchronously, the dynamic pressure plate preferably forms a floating state in the sleeve to reduce the friction between the adjacent components of the dynamic pressure plate, thereby improving the smoothness and stability of the rotating shaft during rotation and reducing the noise generated by friction.

[0003] However, since the hydraulic support force may be insufficient due to various circumstances, the dynamic pressure plate will easily collide with, contact with, and rub against adjacent components during rotation, thereby generating loud noise, and even causing the bottom cover under the sleeve to be penetrated due to friction loss, resulting in loss of lubricating fluid and damage to the dynamic pressure bearing.

[0004] In view of this, the existing hydrodynamic bearings still need to be improved. Utility Model Content

[0005] In order to solve the above problems, the purpose of the present invention is to provide a dynamic pressure bearing that can reduce the friction between the dynamic pressure plate and the bottom cover.

[0006] A second object of the present invention is to provide a dynamic pressure bearing that can reduce noise generated by friction between a dynamic pressure plate and adjacent components.

[0007] Another object of the present invention is to provide a hydrodynamic bearing that can maintain the sealing performance of the sleeve or reduce the possibility of the bottom cover being penetrated due to wear.

[0008] Another object of the present invention is to provide a motor that can achieve the above-mentioned purpose of the hydrodynamic bearing.

[0009] Another object of the present invention is to provide a fan device that can achieve the above-mentioned purpose of the hydrodynamic bearing.

[0010] The directions or their approximate terms described throughout the present invention, such as "front", "rear", "left", "right", "upper (top)", "lower (bottom)", "inner", "outer", "side", "end", "axial direction" and "radial direction", etc., are mainly referred to the directions in the accompanying drawings. Each direction or its approximate terms is only used to assist in explaining and understanding the various embodiments of the present invention and is not intended to limit the present invention.

[0011] The quantifiers “a” or “an” used in the elements and components described throughout the present invention are only for convenience of use and to provide a general meaning of the scope of the present invention; in the present invention, they should be interpreted as including one or at least one, and a single concept also includes multiple cases, unless it is obvious that it means otherwise.

[0012] Throughout the present invention, similar terms such as “combine,” “assemble,” “assemble,” and “set” mainly include forms in which components can be separated without damaging them after connection, or in which components cannot be separated after connection. Those skilled in the art can choose according to the materials of the components to be connected or the assembly requirements.

[0013] The cam is secured to a position 56° with respect to the first end of the sleeve and secured to a location where the cam is located, wherein the cam is secured to a location where the cam is located and wherein the cam is secured to a location where the cam is located.

[0014] The motor of the present invention has a hydrodynamic bearing as described above, and further includes a housing, a motor rotor, and a motor stator; the hydrodynamic bearing is disposed on the housing; the motor rotor is coupled to the rotating shaft of the hydrodynamic bearing; and the motor stator is disposed on the housing corresponding to the motor rotor.

[0015] The fan device of the present invention has a hydrodynamic bearing as described herein, and further includes a housing, a fan rotor, and a motor stator; the hydrodynamic bearing is disposed on the housing; the fan rotor has a motor rotor and a plurality of fan blades extending outward from the motor rotor, the motor rotor being coupled to the rotating shaft of the hydrodynamic bearing; and the motor stator is disposed on the housing corresponding to the motor rotor.

[0016] Therefore, the dynamic pressure bearing, motor and fan device of the present invention can reduce the probability or contact area of the dynamic pressure plate contacting other parts of the bottom cover due to tilting during rotation by making the height of the first protrusion of the bottom cover greater than the height of other parts of the bottom cover, thereby achieving the effect of avoiding noise or reducing the noise volume.

[0017] The inner end of the bottom cover further comprises an inner circumferential recess and / or a second protrusion. In the case of the inner circumferential recess, it is located within the inner circumference of the first protrusion, and the height of the first protrusion is greater than the height of the inner circumferential recess. In the case of the second protrusion, the outer circumferential recess is located between the first and second protrusions, and the height of the first protrusion is greater than the height of the second protrusion. Thus, the provision of the inner circumferential recess provides ample space for storing lubricating fluid, thereby improving the smoothness of rotation of the rotating shaft and the dynamic pressure plate.

[0018] The positioning member defines a pair of surfaces on a surface of the dynamic pressure plate. The vertical distance between the pair of surfaces and the first protrusion of the bottom cover defines a dynamic pressure space height. The dynamic pressure plate has a thickness less than the dynamic pressure space height. This ensures that the dynamic pressure plate has sufficient space to generate a corresponding dynamic pressure effect with the lubricating fluid, thereby reducing friction during rotation of the rotating component and correspondingly improving rotational smoothness.

[0019] The dynamic pressure bearing also includes a spacer that abuts the bottom cover and the positioning member to create a dynamic pressure space. This ensures that the dynamic pressure plate has sufficient space to generate a corresponding dynamic pressure effect with the lubricating fluid, thereby reducing friction during rotation of the rotating component and correspondingly improving rotational smoothness. Furthermore, the spacer's simple structure simplifies the construction of other components, avoiding the more precise manufacturing tolerances required for more complex components, thereby helping to reduce manufacturing costs.

[0020] The dynamic pressure bearing further includes a supporting protrusion extending from one of the sleeve, the bottom cover, or the positioning member, and abutting between the bottom cover and the positioning member to form the dynamic pressure space height. This ensures that the dynamic pressure plate has sufficient space to generate a corresponding dynamic pressure effect with the lubricating fluid, thereby achieving the effects of reducing friction during rotation of the rotating component and correspondingly improving rotational smoothness. Furthermore, since the supporting protrusion is formed from existing components, the overall number of components can be reduced, which facilitates assembly.

[0021] The positioning member is aligned with a surface of the dynamic pressure plate, defining a corresponding alignment surface. The alignment recess is recessed from the alignment surface. The radial end of the dynamic pressure plate is axially aligned with the peripheral recess and / or the alignment recess. This reduces axial collision or friction at the radial end of the dynamic pressure plate.

[0022] The hydrodynamic bearing further includes a leak-proof ring, which is coupled to the sleeve to position the bearing between the positioning member and the leak-proof ring. The leak-proof ring has a through-hole and an inclined surface. The through-hole is used to allow the shaft to pass through. The inclined surface is formed on the lower edge of the leak-proof ring near the through-hole and gradually thickens from the through-hole toward the bearing. This prevents lubricant from leaking out of the leak-proof ring through the through-hole.

[0023] The dynamic pressure plate has a harderness greater than that of at least one of the positioning member and the first protrusion. This reduces friction noise between the dynamic pressure plate and adjacent components during rotation, and prevents wear of the dynamic pressure plate, maintaining smooth rotation over a long period of time.

[0024] The hardness of the dynamic pressure plate is equal to that of the base of the bottom cover, so that the base is not easily worn and the sealing performance of the sleeve can be maintained.

[0025] The dynamic pressure plate has an upper surface and a lower surface that oppose each other in an axial direction, and the dynamic pressure bearing further includes a coating layer formed on at least one of the upper surface of the dynamic pressure plate and a surface of the positioning member facing the dynamic pressure plate, and / or formed on at least one of the lower surface of the dynamic pressure plate and the first protruding surface of the first protruding portion. Thus, by providing the corresponding coating layer on at least one surface of the dynamic pressure plate or an adjacent component, noise generated by friction between the dynamic pressure plate and the adjacent component can be reduced.

[0026] The coating layer has a roughness smaller than that of the surface to which it is attached, thereby effectively reducing the noise generated by friction between the dynamic pressure plate and adjacent components.

[0027] The coating layer is made of at least one of electroless nickel, chemical nickel, Teflon, titanium nitride, chromium nitride, chromium carbon nitride, and zirconium oxide, thereby reducing noise generated by friction between the dynamic pressure plate and adjacent components. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 : An exploded perspective view of an embodiment of the hydrodynamic bearing of the present invention;

[0029] Figure 2 : A combined cross-sectional view of the utility model hydrodynamic bearing;

[0030] Figure 3 :like Figure 2 A magnified view of middle A;

[0031] Figure 4 : A cross-sectional view of an embodiment of the bottom cover of the present invention;

[0032] Figure 5: A cross-sectional view of another embodiment of the bottom cover of the present invention;

[0033] Figure 6 : A cross-sectional view of an embodiment of the present invention in which a supporting protrusion extends from a sleeve;

[0034] Figure 7 : A cross-sectional view of an embodiment of the present invention in which a supporting protrusion extends from the bottom cover;

[0035] Figure 8 : A cross-sectional view of an embodiment of the present invention in which a supporting protrusion extends from a positioning member;

[0036] Figure 9 :The utility model is as Figure 1 Exploded perspective view of the middle dynamic pressure plate and adjacent components;

[0037] Figure 10 :like Figure 2 The enlarged view of A in the middle is used to indicate where the coating layer can be set;

[0038] Figure 11 : An exploded perspective view of an embodiment of a fan device of the present invention;

[0039] Figure 12 : A cross-sectional view of the fan device of the present invention;

[0040] Figure 13 : A combined cross-sectional view of an embodiment of a motor of the present invention.

[0041] Description of reference numerals:

[0042] 1: Sleeve

[0043] 10:Through the channel

[0044] 10a: first end opening

[0045] 10b: second end opening

[0046] 2: Bottom cover

[0047] 20: Matrix

[0048] 21: first protrusion

[0049] 21f: first convex surface

[0050] 22: Peripheral concave portion

[0051] 22f: Peripheral concave surface

[0052] 23: Inner circumference recess

[0053] 23f: Inner circumferential concave surface

[0054] 24: Second protrusion

[0055] 24f: Second convex surface

[0056] 3: Positioning parts

[0057] 30: Positioning hole

[0058] 31: Counterplane

[0059] 32: Positioning recess

[0060] 4: Bearings

[0061] 40: shaft hole

[0062] 5: Shaft

[0063] 5a: Inner end face

[0064] 5b: outer end face

[0065] 51: protrusion

[0066] 6: Dynamic pressure plate

[0067] 6a: Upper surface

[0068] 6b: Lower surface

[0069] 6E: Radial end

[0070] 60: Mounting hole

[0071] 7: Spacer

[0072] 7A, 7B, 7C: Support convex parts

[0073] 8: Leak-proof ring

[0074] 80: hole

[0075] 81: Incline

[0076] B: Bearing assembly

[0077] C, C': Shell seat

[0078] F: coating layer

[0079] FB: Fan Blade

[0080] FR: Fan rotor

[0081] G: Dynamic pressure groove

[0082] H21: First protrusion height

[0083] H22: Peripheral depression height

[0084] H23: Inner circumference depression height

[0085] H24: Second protrusion height

[0086] Hm: dynamic pressure space height

[0087] L6: Length of dynamic pressure plate

[0088] L21: length of the first protrusion

[0089] MS,MS': Motor stator

[0090] MR, MR': motor rotor

[0091] PB: Hydrodynamic bearing

[0092] R: Rotating component

[0093] S: Sleeve assembly

[0094] T:Thickness

[0095] Y: axial direction. DETAILED DESCRIPTION

[0096] In order to make the above and other objects, features and advantages of the present invention more clearly understood, preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0097] Please refer to Figures 1 to 4 As shown, it is a first embodiment of the hydrodynamic bearing PB of the present invention, comprising a sleeve assembly S, a rotating assembly R and a bearing assembly B. The bearing assembly B is located inside the sleeve assembly S, and the rotating assembly R is rotatably coupled to the bearing assembly B.

[0098] The sleeve assembly S may include a sleeve 1 and a bottom cover 2. The sleeve 1 is a cylindrical body having a through passage 10 therein. In this embodiment, the through passage 10 of the sleeve 1 extends along an axial direction Y and has a first end opening 10a and a second end opening 10b opposite to each other.

[0099] The bottom cover 2 seals one end of the sleeve 1. Specifically, the bottom cover 2 is coupled to the sleeve 1 and closes the second end opening 10b, forming a dead-end passage within the sleeve 1 for accommodating the bearing assembly B and the rotating assembly R. Thus, by sealing the second end opening 10b of the sleeve 1 with the bottom cover 2, leakage of lubricating fluid within the sleeve 1 is prevented.

[0100] Specifically, the bottom cover 2 has an outer end and an inner end opposite to each other, the outer end being arranged in a direction away from the first end opening 10a / the end closed passage, and the inner end being arranged in a direction facing the first end opening 10a / the end closed passage. The bottom cover 2 has a base 20 arranged at the outer end. The inner end of the bottom cover 2 has a first protrusion 21 and a peripheral recessed portion 22 surrounding the outer periphery of the first protrusion 21. The first protrusion 21 is aligned with a dynamic pressure plate 6 of the rotating assembly R. Optionally, the inner periphery of the first protrusion 21 has an inner peripheral recessed portion 23 for storing lubricating liquid or providing a space for a portion of the rotating assembly R to extend into. Optionally, the outer periphery of the outer peripheral recess 22 includes a second protrusion 24, such that the outer periphery recess 22 is located between the first protrusion 21 and the second protrusion 24. By placing the second protrusion 24 on the outer periphery of the outer periphery recess 22, the space within the outer periphery recess 22 can be reduced, thereby reducing the amount of lubricating fluid used. The first protrusion 21 has a height greater than that of each of the outer periphery recess 22, the inner periphery recess 23, and the second protrusion 24. By configuring the first protrusion 21 to have the greatest height, the noise generated by friction during the rotation of the rotating assembly R can be reduced.

[0101] Optionally, as in the present invention Figures 1 to 5 In the example of FIG, the bottom cover 2 has the first protrusion 21, the outer peripheral recess 22, the inner peripheral recess 23, and the second protrusion 24. The first protrusion 21 is formed as an annular protrusion and may have a first protruding surface 21f and a first protruding height H21; the outer peripheral recess 22 is formed as an annular groove on the outer periphery of the first protrusion 21 and may have an outer peripheral concave surface 22f and an outer peripheral recess height H22; the inner peripheral recess 23 is formed on the inner periphery of the first protrusion 21 and may have an inner peripheral concave surface 23f and an inner peripheral recess height H23; the second protrusion 24 is an annular protrusion formed on the outer periphery of the outer peripheral recess 23 and may have a second protruding surface 24f and a second protruding height H24. The first protrusion height H21 is greater than the second protrusion height H24, and the second protrusion height H24 is greater than the outer periphery recess height H22 and the inner periphery recess height H23. The relationship between the outer periphery recess height H22 and the inner periphery recess height H23 can be adjusted according to actual conditions; Figure 4 As shown, the inner periphery recess height H23 is smaller than the outer periphery recess height H22; Figure 5 As shown, the inner peripheral recess height H23 is greater than the outer peripheral recess height H22; however, in other examples, the outer peripheral recess height H22 may be equal to the inner peripheral recess height H23.

[0102] Specifically, if Figure 4 、 Figure 5As shown, in terms of the material composition of the bottom cover 2, the bottom cover 2 can be composed of a first material and a second material, and the hardness of the first material is greater than the hardness of the second material. Figure 4 In the example shown, the portion of the bottom cover 2 extending from the outer end toward the inner end is formed of the first material; the portion of the bottom cover 2 extending from the inner end toward the outer end is formed of the second material. That is, the base 20 is made of the first material; the first protrusion 21, the outer peripheral recess 22, the inner peripheral recess 23, and the second protrusion 24 are made of the second material. Figure 5 In the example shown, the portion of the bottom cover 2 extending from the outer end toward the inner end is formed of the first material; a portion of the portion of the bottom cover 2 extending from the inner end toward the outer end is formed of the first material, and the remaining portion is formed of the second material; that is, the base 20 and the second protrusion 24 are of the first material; the first protrusion 21 and the outer peripheral recess 23 are of the second material; and the inner peripheral recess 22 is formed between the first and second materials. However, the present invention does not Figure 4 、 Figure 5 The examples shown are limited to the examples shown, and in particular, only those that meet the requirements of the first protrusion 21 being made of the second material are within the scope of protection of the present invention.

[0103] like Figures 1 to 4 As shown, the bearing assembly B is arranged in the sleeve assembly S, in particular, in the through channel 10 / the end closed channel. The bearing assembly B can have a positioning member 3 and a bearing 4. The positioning member 3 is arranged in the sleeve 1 near the second end opening 10b. The bearing 4 can be combined with the positioning member 3 and arranged between the positioning member 3 and the first end opening 10a. The positioning member 3 and the bearing 4 are annular or cylindrical structures, and have a positioning hole 30 and an axial hole 40 that are interconnected in an axial extension direction, so that a rotating shaft 5 of the rotating assembly R can be rotatably passed through the positioning hole 30 and the axial hole 40. In an embodiment of the present utility model, as Figure 3 As shown, the positioning member 3 is close to and opposite to a surface of the dynamic pressure plate 6, which is defined as a pair of surfaces 31. The vertical distance between the pair of surfaces 31 and the first protrusion 21 of the bottom cover 2 defines a dynamic pressure space height Hm, which is used to provide sufficient space in the sleeve 1 for the dynamic pressure plate 6 to be rotatably arranged; in particular, the dynamic pressure plate 6 has a thickness T that is less than the dynamic pressure space height Hm.

[0104] like Figures 1 to 4As shown, the rotating assembly R includes a rotating shaft 5 and a dynamic pressure plate 6. The rotating shaft 5 is rotatably arranged in the positioning hole 30 of the positioning member 3 and the shaft hole 40 of the bearing 4. The rotating shaft 5 has an inner end face 5a and an outer end face 5b opposite to each other. The inner end face 5a is located inside the sleeve 1, and the outer end face 5b is located outside the sleeve 1. The dynamic pressure plate 6 is combined with the rotating shaft 5 to rotate synchronously, so that when the rotating shaft 5 rotates, the dynamic pressure plate 6 is driven to rotate synchronously. The present invention does not limit the manner in which the dynamic pressure plate 6 is combined with the rotating shaft 5; in a specific example, the rotating shaft 5 has a protrusion 51, in particular, protruding outward from the inner end face 5a, and the dynamic pressure plate 6 has a mounting hole 60. The rotating shaft 5 is fixed to the dynamic pressure plate 6 by being combined with the mounting hole 60 through the protrusion 51.

[0105] Specifically, if Figure 3 As shown, the dynamic pressure plate 6 is arranged between the bottom cover 2 and the positioning member 3, and in particular, the thickness T of the dynamic pressure plate 6 is smaller than the dynamic pressure space height Hm, so that when the rotating shaft 5 of the rotating component R and the dynamic pressure plate 6 rotate, the lubricating fluid in the sleeve assembly S can generate a corresponding dynamic pressure effect, so that the dynamic pressure plate 6 floats in the dynamic pressure space height Hm without contacting the bottom cover 2 and the positioning member 3, so as to reduce the friction of the rotating component R during rotation and correspondingly improve the smoothness of rotation.

[0106] Specifically, if Figure 3 As shown, the dynamic pressure plate 6 is positioned in alignment with the first protrusion 21 of the bottom cover 2 in the axial direction Y. Specifically, in a radial direction (perpendicular to the axial direction Y), the dynamic pressure plate 6 has a dynamic pressure plate length L6, and the first protrusion 21 has a first protrusion length L21, with the dynamic pressure plate length L6 being greater than the first protrusion length L21. Preferably, the portion of the dynamic pressure plate 6 that protrudes beyond the first protrusion 21 in the radial direction aligns with the peripheral recessed portion 22, which is shorter than the height of the first protrusion 21, in the axial direction Y. This reduces interference / collision between the dynamic pressure plate 6 and the bottom cover 2 when the dynamic pressure plate 6 tilts or shakes, particularly reducing interference between the dynamic pressure plate 6 and the bottom cover 2 in the area near its radial end 6E. Similarly, to reduce interference between the dynamic pressure plate 6 and the positioning member 3 due to tilting or shaking, the positioning member 3 is recessed from the alignment surface 31 to form an alignment recess 32, and preferably, the radial end 6E of the dynamic pressure plate 6 is aligned with the alignment recess 32 in the axial direction Y. In other words, the radial end 6E of the dynamic pressure plate 6 is axially aligned with the outer peripheral recess 22 and / or the alignment recess 32 to reduce the occurrence of collision or friction.

[0107] It should be noted that the dynamic pressure plate 6 is harder than the first protrusion 21 and the positioning member 3. This reduces the noise generated by contact friction when the dynamic pressure plate 6 contacts the bottom cover 2 or the positioning member 3 due to an imbalance in the forces acting between the dynamic pressure plate 6 and the lubricating fluid. Preferably, the dynamic pressure plate 6 can be made of steel, and the first protrusion 21 and the positioning member 3 can be made of copper or aluminum. However, it should be noted that the present invention is not limited to the materials listed above. It should also be noted that since the bottom cover 2 is composed of two materials of different hardness, in particular, at least the base 20 is made of a first material with a higher hardness, and at least the first protrusion 21 is made of a second material with a lower hardness; on the one hand, in addition to being able to achieve the effect of reducing noise by having the first protrusion 21 with a lower hardness contact with the dynamic pressure plate 6; on the other hand, by having the base 20 with a higher hardness, even if the first protrusion 21 is exhausted and penetrated in an axial direction Y due to friction, the hardness of the base 20 can be similar to or equal to the hardness of the dynamic pressure plate 6, so that the base 20 is not easily worn to maintain the sealing of the sleeve 1; or the hardness of the base 20 can be greater than the hardness of the first protrusion 21 to improve the wear resistance and support of the base 20.

[0108] In particular, in order to further enhance the dynamic pressure effect, the dynamic pressure bearing PB of the present invention may further include a plurality of dynamic pressure grooves G. The plurality of dynamic pressure grooves G may be located on at least one of a surface of the first protrusion 21 of the sleeve 1 facing the dynamic pressure plate 6 and a lower surface 6b of the dynamic pressure plate 6, and / or may be located on at least one of the alignment surface 31 of the positioning member 3 and an upper surface 6a of the dynamic pressure plate 6. In the illustrated examples of the present invention, although the upper surface 6a and the lower surface 6b of the dynamic pressure plate 6 are provided with a plurality of dynamic pressure grooves G aligned with each other in the axial direction Y, the positions of the dynamic pressure grooves G, whether they are aligned or offset, and the shapes of the dynamic pressure grooves G may be selected and changed as needed, and are not limited to the drawings disclosed in the present invention.

[0109] It should be noted that, in order to form the dynamic pressure space height Hm, in the illustrated example of the present invention, the dynamic pressure bearing PB may further include a spacer 7 abutting between the bottom cover 2 and the positioning member 3 to maintain the dynamic pressure space height Hm; in particular, the spacer 7 is an annular body. The spacer 7 is preferably located in the axial direction Y, aligned with the outer peripheral recessed portion 22 (especially in the case where the second protruding portion 24 is not present) or the second protruding portion 24, and more preferably aligned with the second protruding portion 24. Alternatively, as Figure 6 As shown, the spacer 7 can be a supporting protrusion 7A extending inwardly from the sleeve 1 in the radial direction. Alternatively, as Figure 7As shown, the spacer 7 can be a supporting protrusion 7B extending from the inner end of the bottom cover 2 toward the outer end; in this example, the peripheral recessed portion 22 is provided between the supporting protrusion 7B and the first protrusion 21; in particular, the height of the supporting protrusion 7B is greater than the height of the first protrusion 21. Alternatively, as Figure 8 As shown, the spacer 7 can be a supporting protrusion 7C extending from the positioning member 3 toward the bottom cover 2; specifically, the supporting protrusion 7C protrudes from a position adjacent to the outer periphery of the positioning member 3. However, the present invention is not limited to the above-described method for forming the dynamic pressure space height Hm. Specifically, when using a separate spacer 7 as shown in the present invention, its simple structure simplifies the construction of other components (such as the supporting protrusions 7A, 7B, or 7C formed on the sleeve 1, bottom cover 2, or positioning member 3). This avoids the need for more precise manufacturing tolerances for more complex components, thereby helping to reduce manufacturing costs.

[0110] The hydrodynamic bearing PB of the present invention may further include a leak-proof ring 8 , which is coupled to the sleeve 1 to position the bearing 4 between the positioning member 3 and the leak-proof ring 8 , thereby preventing the lubricant from leaking out. The leak-proof ring 8 has a through-hole 80 for the shaft 5 to pass through. The leak-proof ring 8 may have a sloped surface 81 formed on the lower edge of the leak-proof ring 8 near the through-hole 80 , gradually thickening from the through-hole 80 toward the bearing 2 to prevent the lubricant from leaking out of the through-hole 80 of the leak-proof ring 8 .

[0111] In addition, please refer to Figures 9 and 10 In order to avoid or reduce the noise generated by collision or friction between the dynamic pressure plate 6 and the adjacent first protrusion 21 or the positioning member 3 during the rotation process due to various factors, a coating layer F can be formed on the surface of the dynamic pressure plate 6, the first protrusion 21 or the positioning member 3 to reduce the noise during the rotation of the rotating component R. Specifically, the coating layer F can be formed on at least one of the upper surface 6a of the dynamic pressure plate 6 and the alignment surface 31 of the positioning member 3, and / or can be formed on at least one of the lower surface 6b of the dynamic pressure plate 6 and the first protrusion surface 21f. Figure 10 The thick black dashed lines shown indicate the locations where each coating layer F is formed. The coating layer F can be composed, for example, of a polymer material. Preferably, the coating layer F has a roughness less than that of the surface to which it is attached. The coating layer F's improved smoothness (less roughness) can effectively reduce noise generated during the rotation of the rotating component R. Alternatively, the coating layer F can be made of materials such as electroless nickel, chemical nickel, Teflon, titanium nitride (TiN), chromium nitride (CrN), chromium carbon nitride (TiCN), or zirconium oxide (ZrN).

[0112] Please refer to Figures 11 and 12 FIG. 1 shows a preferred embodiment of a fan device according to the present invention, comprising a housing C, the aforementioned hydrodynamic bearing PB, a fan rotor FR, and a motor stator MS. The hydrodynamic bearing PB is mounted on the housing C. The fan rotor FR comprises a motor rotor MR and a plurality of blades FB extending outward from the motor rotor MR. The motor rotor MR is coupled to the rotating shaft 5 of the hydrodynamic bearing PB. The motor stator MS is mounted on the housing C in correspondence with the motor rotor MR, driving the fan rotor FR through electromagnetic conversion by the motor stator MS.

[0113] Please refer to Figure 13 FIG. 1 shows a preferred embodiment of the motor of the present invention, comprising a housing C', the aforementioned hydrodynamic bearing PB, a motor rotor MR', and a motor stator MS'. The hydrodynamic bearing PB is mounted on the housing C'. The motor rotor MR' is coupled to the rotating shaft 5 of the hydrodynamic bearing PB. The motor stator MS' is mounted on the housing C' in correspondence with the motor rotor MR', driving the motor rotor MR' to rotate through electromagnetic conversion generated by the motor stator MS'.

[0114] It should be noted that in the examples shown in the drawings of the present invention, in particular Figures 11 to 13 Although the motor rotors MR, MR' and the motor stators MS, MS' are arranged as an outer rotor and an inner stator, the present invention is not limited thereto.

[0115] In summary, the hydrodynamic bearing, motor, and fan device of the present invention, by having the first protrusion of the bottom cover, which contacts the dynamic pressure plate, be greater in height than the rest of the bottom cover, can reduce the probability or area of contact between the dynamic pressure plate and other parts of the bottom cover due to tilting during rotation, thereby avoiding noise or reducing the volume of the noise. Furthermore, by having the dynamic pressure plate have a greater hardness than that of its adjacent components (i.e., the first protrusion of the bottom plate and the positioning member), the noise caused by friction between the dynamic pressure plate and the adjacent components during rotation can be reduced, ensuring that the dynamic pressure plate is less susceptible to wear and maintains smooth rotation over a long period of time. Furthermore, by having the bottom cover comprised of two materials of different hardness, the first protrusion having a lower hardness contacts the dynamic pressure plate, thereby reducing noise. Furthermore, by having a higher hardness base, even if the first protrusion is worn out in an axial direction due to friction, the base can still maintain the sealing of the sleeve and reduce the possibility of penetration due to wear. In addition, by providing a coating layer (preferably with low roughness / high smoothness) on at least one surface of the dynamic pressure plate or the adjacent component, the noise generated by the friction between the dynamic pressure plate and the adjacent component can be reduced.

[0116] Although the present invention has been disclosed using the preferred embodiments described above, they are not intended to limit the present invention. Any person skilled in the art may make various changes and modifications to the above embodiments without departing from the spirit and scope of the present invention, and these changes and modifications still fall within the technical scope protected by the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A dynamic pressure bearing, characterized in that: include: A sleeve having a through passage, the through passage having a first end opening and a second end opening opposite to each other; a bottom cover, closing the second end opening of the sleeve; the bottom cover having an outer end and an inner end opposite to each other; the bottom cover having a base disposed at the outer end; the inner end of the bottom cover having a first protrusion and a peripheral recessed portion circumferentially disposed around the outer periphery of the first protrusion, the first protrusion being greater than the peripheral recessed portion; a positioning member, disposed in the sleeve near the second end opening, and having a positioning hole; a bearing, disposed between the positioning member and the first end opening, and having an axial hole communicating with the positioning hole; a rotating shaft rotatably inserted into the positioning hole and the shaft hole; and A dynamic pressure plate is arranged between the bottom cover and the positioning member and is fixedly connected to the rotating shaft. The dynamic pressure plate is aligned with the first protrusion in an axial direction.

2. The dynamic pressure bearing according to claim 1, wherein: The inner end of the bottom cover further has an inner peripheral recessed portion and / or a second protruding portion; in the case of having the inner peripheral recessed portion, the inner peripheral recessed portion is arranged at the inner periphery of the first protruding portion, and the height of the first protruding portion is greater than the height of the inner peripheral recessed portion; in the case of having the second protruding portion, the outer peripheral recessed portion is arranged between the first protruding portion and the second protruding portion, and the height of the first protruding portion is greater than the height of the second protruding portion.

3. The dynamic pressure bearing according to claim 1 or 2, wherein: The positioning member is defined as a positioning surface on a surface of the dynamic pressure plate, the vertical distance between the positioning surface and the first protrusion of the bottom cover defines a dynamic pressure space height, and the dynamic pressure plate has a thickness smaller than the dynamic pressure space height.

4. The dynamic pressure bearing according to claim 3, wherein: A spacer is also provided, and the spacer is abutted between the bottom cover and the positioning member to form the height of the dynamic pressure space.

5. The dynamic pressure bearing according to claim 3, wherein: The invention also has a supporting protrusion, which is extended from the sleeve, the bottom cover or one of the positioning members and abuts between the bottom cover and the positioning member to form the height of the dynamic pressure space.

6. The dynamic pressure bearing according to claim 1 or 2, wherein: A surface of the positioning member aligned with the dynamic pressure plate is defined as an alignment surface, an alignment recess is recessed from the alignment surface, and the radial end of the dynamic pressure plate is axially aligned with the peripheral recess and / or the alignment recess.

7. The dynamic pressure bearing according to claim 1 or 2, wherein: It also includes a leak-proof ring, which is combined with the sleeve so that the bearing is located between the positioning member and the leak-proof ring, and the leak-proof ring has a through-hole and an inclined surface. The through-hole is used for the rotating shaft to pass through. The inclined surface is formed on the lower edge wall of the leak-proof ring close to the through-hole and gradually thickens from the through-hole toward the bearing.

8. The dynamic pressure bearing according to claim 1 or 2, wherein: The dynamic pressure plate has a hardness greater than that of at least one of the positioning member and the first protrusion.

9. The dynamic pressure bearing according to claim 8, wherein: The hardness of the dynamic pressure plate is equal to the hardness of the base of the bottom cover.

10. The dynamic pressure bearing according to claim 1 or 2, wherein: The dynamic pressure plate has an upper surface and a lower surface opposite to each other in an axial direction, and the dynamic pressure bearing further has a coating layer formed on at least one of the upper surface of the dynamic pressure plate and a surface of the positioning member facing the dynamic pressure plate, and / or formed on at least one of the lower surface of the dynamic pressure plate and the first protruding surface of the first protrusion.

11. The dynamic pressure bearing according to claim 10, wherein: The coating layer has a roughness smaller than that of the surface to which it is attached.

12. A motor comprising the dynamic pressure bearing according to any one of claims 1 to 11, wherein: It also includes a housing, a motor rotor and a motor stator; the hydrodynamic bearing is arranged on the housing; the motor rotor is combined with the rotating shaft of the hydrodynamic bearing; the motor stator is arranged on the housing corresponding to the motor rotor.

13. A fan device comprising the dynamic pressure bearing according to any one of claims 1 to 11, wherein: It also includes a housing, a fan rotor and a motor stator; the hydrodynamic bearing is arranged on the housing; the fan rotor has a motor rotor and a plurality of fan blades extending outward from the motor rotor, and the motor rotor is combined with the rotating shaft of the hydrodynamic bearing; the motor stator is arranged on the housing corresponding to the motor rotor.

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