Dynamic pressure bearing and fan with same

Abstract

A dynamic pressure bearing is used for solving the problem that an existing dynamic pressure bearing generates abnormal noise. Comprising a bearing pack; and the rotating piece is provided with a rotating shaft, the rotating shaft is rotatably arranged in the bearing pack in a penetrating manner, one inner end surface of the rotating shaft is provided with a convex part, the rotating piece is provided with a thrust plate, and the thrust plate is combined with the convex part through a combination hole. The rotating shaft is provided with an annular concave part, and the annular concave part surrounds the protruding part. The utility model further provides a fan with the dynamic pressure bearing. Therefore, the thrust plate can stably and horizontally rotate so as to avoid generation of abnormal noise.

Description

Technical Field

[0001] This utility model relates to a motor part, particularly a hydrodynamic bearing inside a motor, and a fan having the hydrodynamic bearing. Background Technology

[0002] Please refer to Figure 1 The present invention is an existing hydrodynamic bearing 9, which has an oil-impregnated bearing 91, a rotating shaft 92 passing through the oil-impregnated bearing 91, and a protrusion 921 on one end face 92a of the rotating shaft 92. The protrusion 921 is coupled to a thrust plate 93. Furthermore, the thrust plate 93 has a connecting hole 931, through which the thrust plate 93 is coupled to the protrusion 921, so that the thrust plate 93 is axially aligned with the oil-impregnated bearing 91. Thus, when the rotating shaft 92 rotates, a hydrodynamic gap can be formed between the thrust plate 93 and the oil-impregnated bearing 91.

[0003] However, the connection between the protrusion 921 and the end face 92a usually forms a naturally formed, curved R-angle. When the mating hole 931 of the thrust plate 93 is installed on the protrusion 921, the curvature of the R-angle will interfere with the edge of the mating hole 931. That is, the edge of the mating hole 931 will touch the R-angle and slide due to the curvature of the R-angle. This makes it difficult to keep the thrust plate 93 horizontal when it is installed, which in turn causes abnormal noise when the shaft 92 drives the thrust plate 93 to rotate.

[0004] In view of this, there is indeed a need to improve the existing hydrodynamic bearings. Utility Model Content

[0005] To solve the above problems, the purpose of this utility model is to provide a hydrodynamic bearing and a fan having the hydrodynamic bearing, which allows the thrust plate to be installed horizontally on the shaft.

[0006] The directional terms or similar terms used throughout this utility model, such as "front", "back", "left", "right", "top", "bottom", "inner", "outer", "side", etc., are mainly for reference to the directions in the accompanying drawings. Each directional term or similar term is only used to assist in explaining and understanding the various embodiments of this utility model and is not intended to limit this utility model.

[0007] The use of the quantifiers “a” or “an” for the elements and components described throughout this utility model is merely for convenience and to provide the general meaning of the scope of this utility model; in this utility model, it should be interpreted as including one or at least one, and a single concept also includes multiple cases, unless it clearly means otherwise.

[0008] The terms “first,” “second,” … and “Nth” used throughout this utility model are mainly used to distinguish different elements or features (such as elements, directions, or steps), and do not indicate the maximum or minimum number of these elements or features possessed by a corresponding subject or method, nor do they limit the order of priority.

[0009] The terms "combination," "integration," or "assembly" used throughout this utility model mainly include those that allow for separation without damaging the components after connection, or those that make the components inseparable after connection. Those skilled in the art can choose the appropriate term based on the material of the components to be connected or the assembly requirements.

[0010] The present invention discloses a hydrodynamic bearing, comprising: a bearing assembly; and a rotating member having a rotating shaft rotatably mounted on the bearing assembly. The rotating shaft has a protrusion on an inner end face. The rotating member has a thrust plate, which is engaged with the protrusion through a connecting hole. The rotating shaft has an annular recess surrounding the protrusion.

[0011] Therefore, in the hydrodynamic bearing of this invention, the rotating shaft has an annular recess that surrounds the protrusion. Thus, when the thrust plate is axially assembled to the protrusion, the edge of the mating hole will not be interfered with, and the thrust plate can reliably abut against the inner end face. By forming a horizontal positioning through the inner end face, the thrust plate can be stably rotated horizontally to avoid generating abnormal noise.

[0012] The bearing assembly includes a bearing and a locating ring. The bearing has a shaft hole, and the locating ring has a through hole. The locating ring is axially engaged with the bearing so that the through hole aligns with the shaft hole. The rotating shaft passes through the shaft hole and the through hole. Thus, the locating ring can be used to engage with the inner wall of a sleeve, and the locating ring can be used to position the bearing within the sleeve.

[0013] The thrust plate abuts against the inner end face. In this way, the thrust plate can be positioned by the inner end face, so that the thrust plate can be stably perpendicular to the axis of the rotating shaft and thus achieve a horizontal effect.

[0014] The connecting hole and the protrusion are tightly fitted together. In this way, the connecting hole can stably connect to the protrusion.

[0015] The connecting hole and the protrusion are loosely fitted together, and then laser-welded to form a fixed connection between them. This allows the thrust plate to be easily and horizontally assembled onto the protrusion.

[0016] The hydrodynamic bearing of this invention may further include several hydrodynamic grooves located on a first surface and / or a second surface of the thrust plate, with the first surface and the second surface facing each other. In this way, the thrust plate and adjacent components can provide hydrodynamic support.

[0017] The inner peripheral wall of the connecting hole has a right-angled edge where it connects to the first surface of the thrust plate, and this edge is located in the annular recess. Thus, the edge can stably abut against the inner end face.

[0018] The annular recess is formed by an axial recess on the inner end face of the rotating shaft, and the annular recess is adjacent to the protrusion. In this way, when the thrust plate is axially assembled to the protrusion, the edge of the mating hole will not be interfered with, the thrust plate can reliably abut against the inner end face, and the inner end face enables the thrust plate to achieve a horizontal positioning effect.

[0019] Specifically, the annular recess extends radially at least 0.05 mm from the inner end face, and this radial extension does not exceed the radial distance from the edge of the engagement hole of the thrust plate to the dynamic pressure groove. Thus, the annular recess has an appropriate radial extension distance on the inner end face, does not obstruct the dynamic pressure support effect of the dynamic pressure groove, and allows the inner end face to provide a stable contact area for the thrust plate.

[0020] The annular recess is formed by radially recessing the protrusion and is adjacent to the inner end face. Thus, when the thrust plate is axially assembled to the protrusion, the edge of the mating hole can reliably abut against the inner end face, and the thrust plate achieves horizontal positioning through the inner end face.

[0021] The annular recess extends axially from the protrusion by at least 0.05 mm, and this axial extension does not exceed the thickness of the thrust plate. Thus, the annular recess has an appropriate axial extension distance from the protrusion, allowing the protrusion to have an area for radially stable contact with the thrust plate and providing better structural strength.

[0022] The fan of this utility model includes: a fan frame having a sleeve containing any of the aforementioned dynamic pressure bearings; a stator located on the outer periphery of the sleeve; and a fan wheel coupled to the rotating shaft of the dynamic pressure bearing. Thus, the thrust plate of the dynamic pressure bearing can rotate stably horizontally, effectively preventing abnormal noise during fan operation. Attached Figure Description

[0023] Figure 1 A diagram of an existing hydrodynamic bearing;

[0024] Figure 2 : An exploded perspective view of the first embodiment of this utility model;

[0025] Figure 3 : A combined diagram of the first embodiment of this utility model;

[0026] Figure 4 Enlarged view of a portion of the structure of the rotating shaft and thrust plate in the first embodiment of this utility model;

[0027] Figure 5 :like Figure 3 The enlarged view of the local structure at point A is shown below;

[0028] Figure 6 : A partial enlarged view of the structure of the second embodiment of this utility model;

[0029] Figure 7 : An exploded perspective view of the fan of this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1: Bearing assembly

[0032] 11: Bearings

[0033] 11a: End face

[0034] 12: Shaft Hole

[0035] 13: Positioning ring

[0036] 13a: Through hole

[0037] 131: Lower surface

[0038] 2: Rotating component

[0039] 21: Shaft

[0040] 21a: Inner end face

[0041] 21b: Outer end face

[0042] 22: Protrusion

[0043] 23: Thrust plate

[0044] 23a: First surface

[0045] 23b: Second surface

[0046] 24: Connecting hole

[0047] 24a: Kongyuan

[0048] 25: Annular depression

[0049] 3: Fan

[0050] 31: Sector frame

[0051] 31a: Base

[0052] 31b: Top cover

[0053] 32: Stator

[0054] 33: Fan wheel

[0055] B: Hydrodynamic bearing

[0056] T: Sleeve

[0057] T1: Base Plate

[0058] T2: Ring Wall

[0059] T3: Leak-proof ring

[0060] T4: Abutment Block

[0061] G: Dynamic pressure trench

[0062] Q: Dynamic pressure clearance

[0063] D1: Radial extension distance

[0064] D2: Axial extension distance

[0065] H1: Radial distance

[0066] H2: Thickness

[0067] ﹝existing﹞

[0068] 9: Hydrodynamic bearing

[0069] 91: Oil-impregnated bearings

[0070] 92: Shaft

[0071] 92a: End face

[0072] 921: Protrusion

[0073] 93: Thrust plate

[0074] 931: Connecting Hole

[0075] R: Angle. Detailed Implementation

[0076] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments of this utility model are described below in detail with reference to the accompanying drawings; in addition, those symbols that are marked with the same symbols in different drawings are considered to be the same and their descriptions will be omitted.

[0077] Please refer to Figure 2 As shown, this is the first embodiment of the dynamic pressure bearing B of the present invention, which includes a bearing assembly 1 and a rotating member 2, the rotating member 2 being rotatably connected to the bearing assembly 1.

[0078] The bearing assembly 1 can be located within a sleeve T. The sleeve T can be used to position the bearing assembly 1 and to contain lubricating oil so that the lubricating oil can be supplied to the bearing assembly 1 for operation. The sleeve T can have components such as a base plate T1, a ring wall T2, and a leak-proof ring T3. One end of the ring wall T2 can be closed by the base plate T1, and the leak-proof ring T3 can be located at the opening at the other end of the ring wall T2. In this way, the interior of the sleeve T can be used for the positioning and installation of the bearing assembly 1, which is understood by those skilled in the art and will not be described in detail here.

[0079] The bearing assembly 1 may include a bearing 11 with two end faces 11a axially opposite each other. The bearing 11 has a shaft hole 12 penetrating the two end faces 11a. Preferably, the bearing assembly 1 may include a positioning ring 13 with a through hole 13a. The positioning ring 13 may be axially engaged with one end face 11a of the bearing 11, so that the through hole 13a aligns with the shaft hole 12. Further, the positioning ring 13 may be adjacent to the base plate T1, tightly fitted to the inner wall of the ring wall T2, and the leak-proof ring T3 may be tightly fitted to the opening of the sleeve T. The leak-proof ring T3 may abut against a shoulder of the bearing 11, and the positioning ring 13 and the leak-proof ring T3 may axially clamp the bearing 11 together. Thus, the positioning ring 13 can be used to position the bearing assembly 1 within the sleeve T. Alternatively, the base plate T1 of the sleeve T may have an abutment block T4 axially positioned opposite the bearing 11, the abutment block T4 may abut against the positioning ring 13, and the anti-leakage ring T3 may be tightly fitted into the opening of the sleeve T, so that the abutment block T4 and the anti-leakage ring T3 together clamp the bearing assembly 1 axially, so that the bearing assembly 1 can be positioned inside the sleeve T.

[0080] Please continue reading. Figure 2 , Figure 3 As shown, the rotating member 2 has a rotating shaft 21, which is rotatably inserted through the shaft hole 12 of the bearing 11. In another embodiment, the rotating shaft 21 is also rotatably inserted through the through hole 13a of the positioning ring 13. The rotating shaft 21 may have an inner end face 21a and an outer end face 21b, the outer end face 21b of which can be used to attach to, for example, a wheel hub. The rotating shaft 21 may have a protrusion 22 located on the inner end face 21a, the protrusion 22 of which can be attached to a thrust plate 23.

[0081] The thrust plate 23 may have a connecting hole 24, through which it is connected to the protrusion 22 of the rotating shaft 21. Preferably, the thrust plate 23 abuts against the inner end face 21a. Further, the thrust plate 23 may have a first surface 23a and a second surface 23b, with the first surface 23a abutting against the inner end face 21a. Thus, the thrust plate 23 can be positioned by the inner end face 21a, stably perpendicular to the axial direction of the rotating shaft 21 and forming a horizontal position. The connecting hole 24 may be tightly fitted to the protrusion 22, or, after a loose fit, the connecting hole 24 and the protrusion 22 may be laser-welded to the second surface 23b to form a fixed connection. In this way, the rotating shaft 21 can stably drive the thrust plate 23 to rotate together. It should be noted that the loose fit between the mating hole 24 and the protrusion 22 prevents the thrust plate 23 from bending accidentally when it is pressed tightly into the protrusion 22, or prevents uneven force from causing the thrust plate 23 to not be perpendicular to the axis of the rotating shaft 21 and become horizontal. Therefore, this loose fit facilitates the horizontal assembly of the thrust plate 23 onto the protrusion 22.

[0082] Preferably, the first surface 23a of the thrust plate 23 and / or the lower surface 131 of the positioning ring 13 of the bearing assembly 1 may have several dynamic pressure grooves G, so that the thrust plate 23 can form a dynamic pressure gap Q with the bearing assembly 1, thereby providing dynamic pressure support. Furthermore, the several dynamic pressure grooves G may be located on the second surface 23b of the thrust plate 23, so that the thrust plate 23 can form dynamic pressure support with the base plate T1. In this embodiment, although the description focuses on the thrust plate 23 having the dynamic pressure grooves G, the several dynamic pressure grooves G may also be located, for example, on the inner surface of the shaft hole 12 and / or the outer surface of the rotating shaft 21, so that dynamic pressure support can be formed between the shaft hole 12 and the rotating shaft 21. In this case, the dynamic pressure grooves G may be omitted from the thrust plate 23, which can be selected and modified by those skilled in the art according to requirements, and is not limited to the drawings disclosed in this utility model.

[0083] Please continue reading. Figure 4 , Figure 5As shown, it is worth noting that the rotating shaft 21 has an annular recess 25. For example, the annular recess 25 can be an arc-shaped groove, a rectangular groove, or a groove of any geometric shape, and is not limited to the drawings disclosed in this embodiment. The annular recess 25 can surround the protrusion 22, that is, the annular recess 25 can be located at the connection between the protrusion 22 and the inner end face 21a, so that the annular recess 25 can at least be adjacent to a hole edge 24a located in the connecting hole 24. The hole edge 24a can be the place where the inner peripheral wall of the connecting hole 24 connects with the first surface 23a of the thrust plate 23. Preferably, the connection between the inner peripheral wall of the connecting hole 24 and the first surface 23a of the thrust plate 23 is at a right angle. For example, the annular recess 25 can be formed by an axial recess in the inner end face 21a of the rotating shaft 21, and the annular recess 25 can be adjacent to the protrusion 22. Thus, when the thrust plate 23 is axially assembled to the protrusion 22, the edge 24a of the mating hole 24 will not be interfered with, so that the thrust plate 23 can reliably abut against the inner end face 21a, and the thrust plate 23 can be horizontally positioned through the inner end face 21a.

[0084] In this embodiment, the annular recess 25 can extend radially from the protrusion 22, such that the annular recess 25 has a radial extension distance D1 at the inner end face 21a. This radial extension distance D1 can be at least greater than 0.05 mm. Furthermore, the radial extension distance D1 does not exceed a radial distance H1 from the hole edge 24a to the dynamic pressure groove G on the first surface 23a of the thrust plate 23. Thus, the annular recess 25 can have an appropriate radial extension distance D1 at the inner end face 21a, and the annular recess 25 will not obstruct the dynamic pressure support effect of the dynamic pressure groove G, and the inner end face 21a can have an area for the thrust plate 23 to form a stable contact area.

[0085] Please continue reading. Figure 6As shown, this is a second embodiment of the hydrodynamic bearing of this utility model. Compared with the first embodiment, the annular recess 25 can be formed by radially recessing the protrusion 22, so that the annular recess 25 can surround the protrusion 22. The annular recess 25 can be adjacent to the inner end face 21a, so that the annular recess 25 can at least be aligned with the edge 24a of the connecting hole 24. Thus, when the thrust plate 23 is axially assembled to the protrusion 22, the edge 24a of the connecting hole 24 can reliably abut against the inner end face 21a, and a horizontal positioning is formed by the inner end face 21a. Preferably, the annular recess 25 can extend axially from the inner end face 21a, such that the annular recess 25 has an axial extension distance D2 to the protrusion 22. The axial extension distance D2 can be at least greater than 0.05 mm, and the axial extension distance D2 does not exceed the thickness H2 of the thrust plate 23. In this way, the annular recess 25 can have an appropriate axial extension distance D2 to the protrusion 22, so that the protrusion 22 can have an area for the thrust plate 23 to radially stably abut against it, and so that the protrusion 22 can have better structural strength.

[0086] Please refer to Figure 7 As shown, the dynamic pressure bearing B of this utility model, after being combined with the sleeve T, can be installed on a fan 3. The fan 3 may have a fan frame 31, the fan frame 31 may have a base 31a and a top cover 31b, and the sleeve T may be located on the base 31a. Furthermore, the outer periphery of the sleeve T may have a stator 32, and the outer end face 21b of the rotating shaft 21 of the dynamic pressure bearing B may be combined with a fan wheel 33, and the stator 32 may drive the fan wheel 33 to rotate.

[0087] In summary, the dynamic pressure bearing and the fan with the dynamic pressure bearing of this utility model have an annular recess on the rotating shaft. The annular recess surrounds the protrusion, so that the annular recess can at least align with the edge of the connecting hole. Therefore, when the thrust plate is axially assembled to the protrusion, the edge of the connecting hole will not be interfered with, and the thrust plate can reliably abut against the inner end face. The inner end face can form a horizontal positioning, which can achieve stable horizontal rotation of the thrust plate and avoid the generation of abnormal noise.

[0088] Although the present invention has been disclosed using the above preferred embodiments, it is not intended to limit the present invention. Any modifications and alterations made by those skilled in the art to the above embodiments without departing from the spirit and scope of the present invention shall still fall within the technical scope protected by the present invention. Therefore, the protection scope of the present invention shall include all changes within the meaning and equivalent scope of the appended claims. Furthermore, when the above embodiments can be combined, the present invention includes any combination of embodiments.

Claims

1. A hydrodynamic bearing, characterized in that, include: A bearing assembly; and A rotating component has a shaft rotatably mounted on the bearing assembly, an inner end face of the shaft having a protrusion, the rotating component having a thrust plate engaged with the protrusion through a connecting hole, and the shaft having an annular recess surrounding the protrusion.

2. The hydrodynamic bearing as described in claim 1, characterized in that, The bearing assembly has a bearing and a locating ring. The bearing has a shaft hole and the locating ring has a through hole. The locating ring is axially connected to the bearing so that the through hole is located in the shaft hole. The rotating shaft passes through the shaft hole and the through hole.

3. The hydrodynamic bearing as described in claim 1, characterized in that, The thrust plate abuts against the inner end face.

4. The hydrodynamic bearing as described in claim 1, characterized in that, The connecting hole and the protrusion are tightly fitted together.

5. The hydrodynamic bearing as described in claim 1, characterized in that, The connecting hole and the protrusion are loosely fitted together, and the connecting hole and the protrusion are fixedly connected by laser welding.

6. The hydrodynamic bearing as described in any one of claims 1 to 5, characterized in that, It also includes several dynamic pressure grooves located on a first surface and / or a second surface of the thrust plate, the first surface being opposite to the second surface.

7. The hydrodynamic bearing as described in claim 6, characterized in that, The inner peripheral wall of the connecting hole has a right-angled edge where it connects with the first surface of the thrust plate, and the edge is located in the annular recess.

8. The hydrodynamic bearing as described in claim 6, characterized in that, The annular recess is formed by an axial recess on the inner end face of the rotating shaft, and the annular recess is adjacent to the protrusion.

9. The hydrodynamic bearing as described in claim 8, characterized in that, The annular recess extends radially at a distance greater than 0.05 mm from the inner end face, and the radial extension distance does not exceed the radial distance from the edge of the connecting hole of the thrust plate to the dynamic pressure groove.

10. The hydrodynamic bearing as described in claim 1, characterized in that, The annular recess is formed by radially recessing the protrusion, and the annular recess is adjacent to the inner end face.

11. The hydrodynamic bearing as described in claim 10, characterized in that, The annular recess extends axially from the protrusion by at least 0.05 mm, and the axial extension does not exceed the thickness of the thrust plate.

12. A fan, characterized in that, include: A sector frame having a sleeve containing a hydrodynamic bearing as described in any one of claims 1 to 11; A stator is located on the outer periphery of the sleeve; A fan wheel is attached to the shaft of the hydrodynamic bearing.

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