An aerodynamic bearing and motor assembly

Abstract

The utility model discloses an air dynamic pressure bearing and motor assembly, air dynamic pressure bearing includes bearing seat and a plurality of foil, and bearing seat has the inner hole, and the foil includes the fixed end and the free end of being linked, a plurality of foil are sequentially arranged on the inner wall of bearing seat along the same circumferential direction of bearing seat, and the free end of each foil is overlapped on adjacent next foil, and a plurality of foil form the inscribed circle for the rotor shaft to pass through, and the diameter of inscribed circle is less than the diameter of rotor shaft, and is used for supporting rotor shaft. This air dynamic pressure bearing not only simplifies the structure, reduces the processing and assembly difficulty simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and in particular to an air dynamic pressure bearing and motor assembly. Background Technology

[0002] Existing air dynamic bearing technology, due to its superior performance, has been widely used in many fields such as high-speed motors, high-speed spindles, and engines, and has significantly improved the operating speed and working efficiency of equipment, becoming synonymous with "higher speed and higher efficiency".

[0003] Most existing air dynamic bearings adopt a multi-layer structure, typically including components such as bearing housing, gaskets, elastic sheets, and top foil, resulting in complex structure, high processing cost, and strict assembly precision requirements. Utility Model Content

[0004] The purpose of this invention is to provide an air dynamic bearing and motor assembly that not only simplifies the structure but also reduces the difficulty of processing and assembly.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An air dynamic bearing, comprising:

[0007] Bearing housing with an inner bore;

[0008] Multiple foils, each foil having a connected fixed end and a free end, are sequentially arranged on the inner wall of the bearing housing along the same circumferential direction. The free end of each foil overlaps the next adjacent foil. The multiple foils form an inscribed circle through which the rotor shaft passes, the diameter of which is smaller than the diameter of the rotor shaft, for supporting the rotor shaft.

[0009] In one embodiment, the free end of the foil in the pneumatic bearing is an arc surface, and the diameter of the free end of the foil is larger than the diameter of the inner hole of the bearing housing; or,

[0010] The free end of the foil is formed by connecting multiple arc-shaped surfaces in sequence; or,

[0011] The free end of the foil is a non-circular curved surface.

[0012] In one embodiment, the inner wall of the bearing housing of the pneumatic bearing is provided with a plurality of accommodating portions evenly arranged circumferentially, and each foil is fixedly connected to one of the accommodating portions at its fixed end.

[0013] In one embodiment, a connector is provided on the fixed end of the foil of the air dynamic bearing, the receiving part is a fixing groove, and the fixed end of the foil is fixed in the fixing groove by the connector.

[0014] In one embodiment, the connecting component of the pneumatic bearing is a round pin, a square pin, or a polygonal pin.

[0015] The fixing groove is a circular, square, or polygonal groove.

[0016] In one embodiment, the receiving portion of the pneumatic bearing is a slit extending axially along the bearing housing, and the fixed end of the foil extends into the receiving portion and is fixedly engaged with the receiving portion.

[0017] In one embodiment, the free end of the foil of the pneumatic bearing covers the fixed end of the next adjacent foil and overlaps at the middle of the free end of the next adjacent foil, forming a gap between the free end of the foil and the inner wall of the bearing housing.

[0018] In one embodiment, the bearing housing of the pneumatic bearing is provided with baffles at both ends along the axial direction, the baffles being used to limit the movement of multiple foils.

[0019] In one embodiment, the number of foils in the pneumatic bearing is 6-12; and / or,

[0020] The foil has a thickness of 0.05mm-1mm; and / or,

[0021] The foil is made of an elastic material.

[0022] A motor assembly, comprising:

[0023] Motor housing;

[0024] An air dynamic pressure bearing, wherein the bearing housing is fixed inside the motor housing;

[0025] Stator, which is fixed inside the motor housing;

[0026] The rotor shaft moves through the inner hole of the stator, and at least one end of the rotor shaft is provided with an aerodynamic bearing, and the end of the rotor shaft passes through the inscribed circle formed by the plurality of foils.

[0027] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0028] This application provides an air dynamic pressure bearing, which replaces the multi-layer elastic sheet structure of existing dynamic pressure bearings by setting multiple single-layer foil sheets to form an overlapping structure in the bearing housing. This not only improves the stability of the bearing in use, but also simplifies the structure, reduces the difficulty of processing and assembly, and reduces the cost of use.

[0029] The foils of this pneumatic bearing are made of arc surface, multi-segment arc surface or non-circular curved surface, which can improve the bearing load capacity and adaptive adjustment performance, suppress rotor yaw, reduce operating power consumption and noise, and extend the service life of bearing and motor components.

[0030] The foil of this pneumatic bearing and the receiving part of the bearing housing are fixedly fitted together by connectors and fixing grooves, respectively, to improve the fixing effect of the foil and thus improve the stability of the bearing. Attached Figure Description

[0031] Figure 1 This is a radial cross-sectional schematic diagram of the air dynamic bearing according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the foil of the air dynamic bearing according to an embodiment of the present invention;

[0033] Figure 3 This is a cross-sectional schematic diagram of the foil of the air dynamic bearing according to an embodiment of the present invention;

[0034] Figure 4 This is a radial cross-sectional schematic diagram of the bearing housing of the air dynamic pressure bearing according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the radial cross-section of the rotor shaft of the air dynamic pressure bearing according to an embodiment of the present invention after installation;

[0036] Figure 6 This is a partial cross-sectional schematic diagram of the rotor shaft of the air dynamic pressure bearing according to an embodiment of the present invention after installation.

[0037] In the figure: 1. Bearing housing; 2. Foil sheet; 3. Rotor shaft; 11. Receiving part; 21. Fixed end; 22. Free end; 23. Connecting piece; 221. First arc surface; 222. Second arc surface. Detailed Implementation

[0038] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0039] The terms used to describe position and direction in this utility model are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this utility model.

[0040] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected" and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] like Figure 1 As shown, an embodiment of this application provides an air dynamic bearing, including a bearing housing 1 and a plurality of foils 2.

[0044] The bearing housing 1 has an inner hole. The outer wall of the bearing housing 1 can be circular, square, polygonal, or other mounting structures, and the form is not limited. The inner hole of the bearing housing 1 is circular. A plurality of receiving portions 11 are evenly arranged circumferentially on the inner wall of the bearing housing 1. The number of receiving portions 11 is the same as the number of foils 2.

[0045] The foil 2 includes a fixed end 21 and a free end 22 connected together. The connection between the fixed end 21 and the free end 22 can be an L-shaped bend. Each foil 2 has its fixed end 21 fixedly connected to one of the receiving portions 11. The fixed end and the free end 21 of the foil 2 are made of elastic material, preferably a highly elastic material. The free end 22 can be an arc surface, a multi-segment arc surface, or a non-circular surface. The plurality of foils 2 are sequentially arranged on the inner wall of the bearing seat 1 along the same circumferential direction. The free end 22 of each foil 2 overlaps the next adjacent foil 2. The plurality of foils 2 form an inscribed circle through which the rotor shaft 3 passes. The diameter of the inscribed circle is smaller than the diameter of the rotor shaft 3, which is used to support the rotor shaft 3. The number of foils 2 can be set according to the size of the bearing sleeve and the support strength of the plurality of foils 2, for example, 6-12. The thickness of foil 2 can be set to 0.05mm-1mm, preferably 0.05mm, 0.06mm, 0.08mm or 1mm.

[0046] Specifically, eight foil pieces 2 can be sequentially installed along the same circumference of the inner wall of the bearing housing 1. The fixed ends 21 of the foil pieces 2 can be fixed to the receiving portion 11 of the bearing housing 1 by welding, pasting, riveting, screwing, etc. The free ends 22 of each foil piece 2 overlap the next adjacent foil piece 2, forming an irregular inscribed circle. Figure 5 As shown, when installing the rotor shaft 3, the inner circumscribed circle is enlarged by tooling or manual pressing. After the rotor shaft 3 is installed, the inner circumscribed circle is released, causing the free ends 22 of the eight foils 2 to elastically adhere to the rotor shaft 3, providing elastic support and maintaining damping. During operation, multiple foils 2 abut against the rotor shaft 3 and the bearing housing 1 to improve the stability of operation between the shaft and the bearing housing 1.

[0047] In the above structure, by setting multiple single-layer foils 2 in the bearing housing 1 to form an overlapping structure, instead of the multi-layer elastic sheet structure of the hydrodynamic bearing in the prior art, the stability of the bearing is not only improved, but the structure is also simplified, reducing the difficulty of processing and assembly, and reducing the cost of use.

[0048] like Figure 1 As shown, in one embodiment, the free end 22 of the foil 2 is an arc surface, and the diameter of the free end 22 of the foil 2 is larger than the diameter of the inner hole of the bearing seat 1. When subjected to pressure from the rotor shaft 3, the arc surface is pressed against the rotor shaft 3. This arrangement provides elastic support for the rotor shaft 3 and maintains damping on the rotor shaft 3.

[0049] like Figure 2 and Figure 6As shown, in one embodiment, the free end 22 of the foil 2 is formed by connecting multiple arc surfaces in sequence. These arc surfaces may include a first arc surface 221 and a second arc surface 222, wherein the first arc surface 221 is close to the fixed end 21 of the foil 2. When the rotor shaft 3 is installed within the inscribed circle formed by the multiple foils 2, the first arc surface 221 and the rotor shaft 3 do not contact each other, forming a wedge-shaped gap, while at least a portion of the second arc surface 222 adheres tightly to the rotor shaft 3. As the rotor shaft 3 rotates, gas enters the wedge-shaped gap region, creating a dynamic pressure effect, thus achieving high speed and stable load bearing.

[0050] like Figure 3 As shown, in one embodiment, the free end 22 of the foil 2 is a non-circular curved surface. During installation on the rotor shaft 3, it partially adheres to the rotor shaft 3, while the remainder forms a wedge-shaped gap with the rotor shaft 3. The rotation of the rotor shaft 3 forms an air-floating surface, achieving stable air-floating support during rotation.

[0051] like Figures 2-4 As shown, in one embodiment, a connector 23 is provided on the fixed end 21 of the foil 2. The connector 23 is a circular pin, a square pin, or a polygonal pin. The receiving portion 11 is a fixing groove, which is formed by a radial groove along the bearing seat 1 and can extend axially along the bearing seat 1. The fixing groove is a circular, square, or polygonal groove. The fixed end 21 of the foil 2 is fixed in the fixing groove by the connector 23. This arrangement improves the connection strength between the fixed end 21 and the receiving portion 11. When the rotor shaft 3 rotates at high speed, the fixed end 21 of the foil 2 will not come out of the fixing groove and move its position due to the restriction of the fixing groove, thereby allowing the multiple foils 2 to stably support the rotor shaft 3.

[0052] In one embodiment, the receiving portion 11 is a slit (not shown) extending axially along the bearing seat 1, and the fixed end 21 of the foil 2 extends into the receiving portion 11 and is fixedly engaged with it. The fixed end 21 of the foil 2 can be folded in half. Since the fixed end 21 is made of elastic material, the folded fixed end 21 extends into the slit and abuts against it, thus achieving a fixing effect. Alternatively, the fixed end 21 can be directly inserted into the slit and fixedly engaged with it to limit the position of the foil 2. This arrangement not only further simplifies the connection structure but also saves material costs, and the foil 2 will not rotate with the shaft when the bearing rotates.

[0053] like Figure 1As shown, in one embodiment, the free end 22 of the foil 2 covers the fixed end 21 of the next adjacent foil 2 and overlaps at the middle of the free end 22 of the next adjacent foil 2. The free ends 22 of each foil 2 have the same shape, and multiple receiving portions 11 are evenly distributed in the inner hole of the bearing seat 1. A gap is formed between the free end 22 of the foil 2 and the inner wall of the bearing seat 1. This arrangement improves the stability of the overlap between the foils 2, and further improves the stability and impact resistance of the bearing during operation.

[0054] In one embodiment, baffles (not shown) are provided at both ends of the bearing housing 1 along the axial direction. The baffles are used to limit the position of multiple foils 2 at both ends of the bearing housing 1 along the axial direction, preventing the foils 2 from moving in the axial direction of the bearing housing 1. The baffles can be configured as circular structures with a diameter larger than that of the rotor shaft 3. The two baffles are respectively welded and fixed at both ends of the bearing housing 1 along the axial direction and located at both ends of the multiple foils 2 along the axial direction, which can effectively prevent the multiple foils 2 from moving axially.

[0055] like Figure 5 As shown, an embodiment of this application also provides a motor assembly, including a motor housing (not shown), an aerodynamic bearing, a stator (not shown), and a rotor shaft 3. The bearing housing 1 is fixed inside the motor housing and can be secured within the motor housing by fasteners. The stator is fixed inside the motor housing and can be secured within the motor housing by fasteners. The rotor shaft 3 movably passes through the inner hole of the stator. At least one end of the rotor shaft 3 is provided with one of the aerodynamic bearings, and the end of the rotor shaft 3 passes through the inscribed circle formed by the plurality of foils 2.

[0056] In one embodiment, the motor assembly includes two pneumatic bearings, namely a front pneumatic bearing and a rear pneumatic bearing, the front pneumatic bearing being disposed at one end of the rotor shaft 3 and the rear pneumatic bearing being disposed at the opposite end of the rotor shaft 3.

[0057] The motor assembly achieves non-contact support by forming a dynamic pressure air film in the air dynamic pressure bearing through the high-speed rotation of the rotor shaft 3. The rotor shaft 3 rotates stably through the inner circle of the foil 2, which can significantly reduce friction and wear, improve operational stability and accuracy, extend the service life of the motor and reduce noise and energy consumption.

[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. An air dynamic bearing, characterized in that, include: Bearing housing (1), having an inner hole; Multiple foils (2) are provided, each foil (2) having a fixed end (21) and a free end (22) connected together. The multiple foils (2) are arranged sequentially on the inner wall of the bearing housing (1) along the same circumferential direction. The free end (22) of each foil (2) overlaps the next adjacent foil (2). The multiple foils (2) form an inscribed circle through which the rotor shaft (3) passes. The diameter of the inscribed circle is smaller than the diameter of the rotor shaft (3) and is used to support the rotor shaft (3).

2. The air dynamic bearing as described in claim 1, characterized in that, The free end (22) of the foil (2) is an arc surface, and the diameter of the free end (22) of the foil (2) is larger than the diameter of the inner hole of the bearing seat (1); or, The free end (22) of the foil (2) is formed by connecting multiple arc surfaces in sequence; or, The free end (22) of the foil (2) is a non-circular curved surface.

3. The air dynamic bearing as described in claim 1, characterized in that, The inner wall of the bearing seat (1) is uniformly provided with a plurality of receiving portions (11) along the circumferential direction, and the fixed end (21) of each foil (2) is fixedly connected to one of the receiving portions (11).

4. The air dynamic bearing as described in claim 3, characterized in that, A connector (23) is provided on the fixed end (21) of the foil (2), and the receiving part (11) is a fixing groove. The fixed end (21) of the foil (2) is fixed in the fixing groove by the connector (23).

5. The air dynamic bearing as described in claim 4, characterized in that, The connector (23) is a round pin, a square pin, or a polygonal pin; The fixing groove is a circular, square, or polygonal groove.

6. The air dynamic bearing as described in claim 3, characterized in that, The receiving portion (11) is a slit extending axially along the bearing seat (1), and the fixed end (21) of the foil (2) extends into the receiving portion (11) and is fixedly engaged with the receiving portion (11).

7. The air dynamic bearing as described in claim 3, characterized in that, The free end (22) of the foil (2) covers the fixed end (21) of the next adjacent foil (2) and overlaps the middle of the free end (22) of the next adjacent foil (2), forming a gap between the free end (22) of the foil (2) and the inner wall of the bearing seat (1).

8. The air dynamic bearing as described in claim 1, characterized in that, The bearing housing (1) is provided with baffles at both ends along the axial direction, and the baffles are used to limit the movement of multiple foils (2).

9. The air dynamic bearing as claimed in claim 1, characterized in that, The number of foils (2) is 6-12; and / or, The foil (2) has a thickness of 0.05 mm to 1 mm; and / or, The foil (2) is made of an elastic material.

10. A motor assembly, characterized in that, include: Motor housing; The air dynamic bearing as described in any one of claims 1-9, wherein the bearing housing (1) is fixed inside the motor housing; Stator, which is fixed inside the motor housing; The rotor shaft (3) moves through the inner hole of the stator, and at least one end of the rotor shaft (3) is provided with an air dynamic bearing, and the end of the rotor shaft (3) passes through the inscribed circle formed by the plurality of foils (2).

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