CN114593137B - Pneumatic pressure bearing structure and motor with same - Google Patents
Pneumatic pressure bearing structure and motor with same Download PDFInfo
- Publication number
- CN114593137B CN114593137B CN202011472390.4A CN202011472390A CN114593137B CN 114593137 B CN114593137 B CN 114593137B CN 202011472390 A CN202011472390 A CN 202011472390A CN 114593137 B CN114593137 B CN 114593137B
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- groove
- dynamic pressure
- bearing
- end edge
- bearing structure
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- 238000009423 ventilation Methods 0.000 claims abstract description 62
- 230000002093 peripheral effect Effects 0.000 claims abstract description 35
- 125000006850 spacer group Chemical group 0.000 claims description 15
- 230000000694 effects Effects 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 description 15
- 238000006073 displacement reaction Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/045—Sliding-contact bearings for exclusively rotary movement for axial load only with grooves in the bearing surface to generate hydrodynamic pressure, e.g. spiral groove thrust bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0402—Bearings not otherwise provided for using magnetic or electric supporting means combined with other supporting means, e.g. hybrid bearings with both magnetic and fluid supporting means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/0408—Passive magnetic bearings
- F16C32/0423—Passive magnetic bearings with permanent magnets on both parts repelling each other
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sliding-Contact Bearings (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention provides a pneumatic bearing structure and a motor with the pneumatic bearing structure, which are used for solving the problem of poor dynamic pressure effect caused by insufficient air supply in the prior art. Comprising the following steps: a base having a shaft tube; a bearing coupled to the shaft tube; the rotor is provided with a rotating piece which is rotatably arranged on the bearing, the peripheral surface of the rotating piece is provided with at least one first dynamic pressure groove and at least one second dynamic pressure groove, the first dynamic pressure groove is not adjacent to the upper end edge and the lower end edge of the rotating piece, and the second dynamic pressure groove is adjacent to the upper end edge or the lower end edge of the rotating piece; wherein, the bearing or/and the shaft tube is provided with at least one ventilation groove, so that the external air flow is communicated with the ventilation groove and the at least one first dynamic pressure groove.
Description
Technical Field
The present invention relates to a motor component and a motor, and more particularly, to a pneumatic bearing structure and a motor having the same.
Background
In order to reduce wear and noise caused by rotation of the motor, pneumatic bearing structures have been widely used in motors. The conventional pneumatic bearing structure may have a bearing coupled to a shaft tube, the bearing may have an upper end portion and a lower end portion, a rotating member rotatably provided to the bearing, an outer circumferential surface of the rotating member having a plurality of dynamic pressure grooves adjacent to the upper end portion or the lower end portion; when the rotating member rotates relative to the bearing, external air flow can enter the plurality of dynamic pressure grooves from the upper end part and the lower end part, and an air pressure film is formed between the rotating member and the bearing, so that the rotating member is supported to rotate, and the rotating member is not in direct contact with the bearing in the rotating process.
In the above conventional pneumatic bearing structure, although the external air flow can enter the plurality of dynamic pressure grooves from the upper end portion and the lower end portion, most of the area between the upper end portion and the lower end portion of the rotating member is not provided with dynamic pressure grooves, so that the external air flow cannot supply air to the position between the upper end portion and the lower end portion, and the air supply is still insufficient, and therefore, enough dynamic pressure cannot be generated, and the dynamic pressure effect is poor.
In view of this, there is a need for improvement in the prior art pneumatic bearing structures.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a pneumatic bearing structure and a motor having the pneumatic bearing structure, which can improve dynamic pressure effect.
The invention provides a pneumatic bearing structure and a motor with the pneumatic bearing structure, which can improve air intake smoothness.
It is still another object of the present invention to provide a pneumatic bearing structure and a motor having the same that can improve the convenience of assembly.
It is still another object of the present invention to provide a pneumatic bearing structure and a motor having the same that can improve rotational stability.
Throughout this disclosure, directional or approximate terms, such as "front", "back", "left", "right", "upper (top)", "lower (bottom)", "inner", "outer", "side", etc., refer primarily to the direction of the drawings and are used merely to aid in the description and understanding of various embodiments of the present invention and are not intended to be limiting.
The use of the terms "a" or "an" for the components and members described throughout this disclosure is for convenience only and provides a general sense of the scope of the invention; it should be understood that the present invention includes one or at least one, and that the singular concept also includes the plural unless it is obvious that it is meant otherwise.
The terms "coupled," "assembled," or "assembled" as used throughout this disclosure, generally include those that are separated without damaging the components after connection, or that are not separated after connection, and may be selected by one skilled in the art based on the materials or assembly requirements of the components to be connected.
The pneumatic bearing structure of the present invention comprises: a base having a shaft tube; a bearing coupled to the shaft tube; the rotor is provided with a rotating piece which is rotatably arranged on the bearing, the peripheral surface of the rotating piece is provided with at least one first dynamic pressure groove and at least one second dynamic pressure groove, the first dynamic pressure groove is not adjacent to the upper end edge and the lower end edge of the rotating piece, and the second dynamic pressure groove is adjacent to the upper end edge or the lower end edge of the rotating piece; wherein, the bearing or/and the shaft tube is provided with at least one ventilation groove, so that the external air flow is communicated with the ventilation groove and the at least one first dynamic pressure groove.
The motor of the invention comprises: a stator disposed around the shaft tube; and a pneumatic bearing structure as described above, the rotor having a permanent magnet pair located in the stator.
Therefore, the pneumatic bearing structure and the motor with the pneumatic bearing structure have at least one ventilation groove by utilizing the bearing or/and the shaft tube, and the ventilation groove can be communicated with the at least one first dynamic pressure groove and the outside; therefore, the external air flow can supply air to the first dynamic pressure groove arranged between the upper end edge and the lower end edge through the ventilation groove, and the external air flow can enter the second dynamic pressure groove through the upper end edge or the lower end edge, so that a uniform, stable and strong air pressure film can be formed between the rotating piece and the bearing, sufficient dynamic pressure can be provided, and the dynamic pressure effect can be improved.
Wherein, the outer peripheral surface of the rotating member may have a ring groove communicating with the first dynamic pressure groove, and the ventilation groove may communicate with the ring groove so as to supply air to the first dynamic pressure groove. Therefore, the structure is simple and convenient to manufacture, and external air flow can enter the first dynamic pressure groove through the annular groove, so that the air inlet smoothness is improved.
The ventilation groove can be concavely arranged on the outer circumferential surface of the bearing, and the ventilation groove can be aligned and communicated with the first dynamic pressure groove through a through hole of the bearing. Therefore, the structure is simple and convenient to manufacture, and external air flow can enter the first dynamic pressure groove through the outer peripheral surface of the bearing, so that the air inlet smoothness is improved.
The ventilation groove may penetrate through an inner circumferential surface and an outer circumferential surface of the bearing. Therefore, the structure is simple and convenient to manufacture, and external air flow can enter the first dynamic pressure groove through the inner peripheral surface and the outer peripheral surface of the bearing, so that the air inlet smoothness is improved.
The ventilation groove may be concavely provided on an inner circumferential surface of the bearing. Therefore, the structure is simple and convenient to manufacture, and external air flow can enter the first dynamic pressure groove through the inner peripheral surface of the bearing, so that the air inlet smoothness is improved.
The bearing may have a through hole penetrating the inner and outer peripheral surfaces of the bearing, and the inner peripheral surface of the shaft tube may have an air inlet channel, and the air inlet channel and the through hole may together form the air vent channel. Therefore, the structure is simple and convenient to manufacture, and external air flow can enter the first dynamic pressure groove through the air inlet channel and the through hole, so that the air inlet smoothness is improved.
One end of the ventilation groove can be positioned at one axial end of the bearing, and the other end of the ventilation groove can be communicated with the first dynamic pressure groove. Therefore, the structure is simple and convenient to manufacture, and external air flow can directly enter the ventilation ditch from one axial end part, so that the ventilation ditch has the effect of improving the smoothness of air intake.
The outer peripheral surface of the rotating member may have a ring groove communicated with the first dynamic pressure groove, two ends of the ventilation groove are respectively located at two axial ends of the bearing, and the bearing may have a through hole aligned with the ring groove and communicated with the ventilation groove. Therefore, the structure is simple and convenient to manufacture, and external air flow can enter the ventilation groove from the two axial end parts, so that the ventilation groove can provide more dynamic pressure for the first dynamic pressure groove, and the dynamic pressure effect is further improved.
The outer circumferential surface of the rotating member may have a ring groove communicated with the first dynamic pressure groove, the inner circumferential surface of the bearing may be concavely provided with a ring groove radially opposite to the ring groove of the rotor, and the ventilation groove may be communicated with the ring groove. Therefore, the structure is simple and convenient to manufacture, and external air flow can enter the first dynamic pressure groove from the ventilation groove, the annular groove and the annular groove in sequence, so that the air flow can enter more smoothly, and the air inlet smoothness is further improved.
The rotor has a second magnetic element located in the shaft tube and radially opposite to the first magnetic element. Therefore, the rotating member can preferably maintain the idle rotation, and can inhibit the axial displacement of the rotating member, so that the rotating member has the effect of improving the rotation stability.
The rotor may have a second magnetic member located on the outer circumferential surface of the central shaft. Therefore, the structure is simple and convenient to assemble, and has the effect of improving the convenience of assembly.
Wherein, the central shaft and the expanding ring part can be integrally formed and connected. Therefore, the central shaft and the expanding ring part can be firmly combined, and the structure strength of the rotating part is improved.
The rotating member may have an expanded diameter ring portion, and the upper end edge and the lower end edge may form a lead angle. Therefore, the structure is simple and convenient to manufacture, and external air flow can easily enter the second dynamic pressure groove through the upper end edge or the lower end edge, so that the dynamic pressure effect is improved.
Wherein at least one axial end of the bearing may have a slit portion. Therefore, the gap part can be used for preventing air from being blocked, and has the effect of improving air intake smoothness.
The pneumatic bearing structure of the present invention may further comprise a retaining ring through which the rotating member may pass, the retaining ring being extendable into an anti-slip groove of the rotating member. Therefore, when the rotating member rotates, the axial displacement of the rotating member can be further limited, and the effect of preventing the rotating member from being separated from the bearing is achieved.
The pneumatic bearing structure of the present invention may further comprise a spacer coupled to the bearing, the spacer being positioned between an enlarged ring portion of the rotating member and the retaining ring. Therefore, the gasket can be used for pressing against the retaining ring, so that the position of the retaining ring can be fixed, and the retaining ring is prevented from being separated from the anti-falling groove.
The pneumatic bearing structure of the present invention may further include a retaining ring, the shaft tube may have a first magnetic member therein, the rotor may have a second magnetic member disposed in the shaft tube and radially opposite to the first magnetic member, the first magnetic member and the bearing abut against two ends of the retaining ring, respectively, and a through hole aperture of the retaining ring may be smaller than a maximum radial width of the rotating member. Therefore, when the rotating member rotates, the axial displacement of the rotating member can be further limited, and the effect of preventing the rotating member from being separated from the bearing is achieved.
The pneumatic bearing structure of the present invention may further comprise a spacer, and the second magnetic member and an expanded ring portion of the rotating member may abut against both ends of the spacer, respectively. Therefore, the gasket can be used for separating the second magnetic piece from the expanding ring part, so that the retaining ring can easily extend into the position between the second magnetic piece and the expanding ring part, and the assembling convenience is improved.
Drawings
Fig. 1: the first embodiment of the present invention incorporates an exploded perspective view of the stator;
Fig. 2: a partially exploded perspective view as shown in fig. 1;
Fig. 3: the first embodiment of the present invention incorporates a combined cross-sectional view of the stator;
Fig. 4: an exploded perspective view of a second embodiment of the present invention;
Fig. 5: the second embodiment of the invention incorporates a combined cross-sectional view of the stator;
fig. 6: the third embodiment of the present invention incorporates a combined cross-sectional view of the stator;
fig. 7: the fourth embodiment of the present invention incorporates a combined cross-sectional view of the stator;
Fig. 8: the fifth embodiment of the invention incorporates a combined cross-sectional view of the stator.
Description of the reference numerals
[ Present invention ]
1 Base
11 Substrate
111 Air inlet duct
12 Shaft tube
12A inner peripheral surface
13 First magnetic member
2 Bearing
2A inner peripheral surface
2B outer peripheral surface
2C axial end portion
21 Through hole
22 Annular groove
23 Slit portion
3 Rotor
3A rotating member
3B second magnetic member
3C housing
3D permanent magnet
30 Peripheral surface
31 Central axis
31A outer peripheral surface
32 Diameter-enlarging ring portion
32A, upper end edge
32B lower end edge
33A first dynamic pressure groove
33B second dynamic pressure groove
34 Ring groove
35 Anti-drop groove
4 Stator
5 Clasp ring
6 Gasket
D1 pore diameter
D2 maximum diameter width
And G, ventilation grooves.
Detailed Description
In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below:
Referring to fig. 1, a first embodiment of a pneumatic bearing structure according to the present invention includes a base 1, a bearing 2 and a rotor 3, wherein the bearing 2 is combined with the base 1, and the rotor 3 is rotatably disposed on the bearing 2.
The base 1 has a base plate 11 and a shaft tube 12, the shaft tube 12 is arranged on the base plate 11, the base plate 11 and the shaft tube 12 can be combined by plastic material integral injection molding; in this embodiment, the shaft tube 12 may be made of metal, so that the shaft tube 12 and the base plate 11 can be combined with each other by means of disassembly and assembly, and the structural strength of the shaft tube 12 is improved. The base 1 may be provided with a first magnetic member 13, the first magnetic member 13 may be located in the shaft tube 12 and away from the base plate 11, and the first magnetic member 13 may be formed in a ring shape.
Referring to fig. 2 and 3, the bearing 2 is disposed in the shaft tube 12, the bearing 2 may have an inner peripheral surface 2a and an outer peripheral surface 2b, the bearing 2 may be attached to the shaft tube 12 by the outer peripheral surface 2b, and the inner peripheral surface 2a and the outer peripheral surface 2b may be connected to two axial ends 2c. The bearing 2 may have a through hole 21, the through hole 21 penetrating through the inner circumferential surface 2a and the outer circumferential surface 2b, the through hole 21 being based on the principle that it does not communicate with the two axial end portions 2c, the position of the through hole 21 being not limited by the present invention; in the present embodiment, the through hole 21 is located at an intermediate position between the two axial end portions 2c.
Referring to fig. 2, the bearing 2 may further have a ring groove 22, the ring groove 22 is concavely disposed on the inner circumferential surface 2a of the bearing 2, and the ring groove 22 may be communicated with the through hole 21; the shape of the annular groove 22 is not limited in the present invention, for example: the annular groove 22 may be formed by a plurality of discontinuous grooves, and in this embodiment, the annular groove 22 is illustrated as forming a whole ring, the annular groove 22 may be located at an intermediate position between the two axial ends 2c, and a portion of the annular groove 22 may overlap the through hole 21. The bearing 2 has at least one slit portion 23, the slit portion 23 may be located closer to the axial end portion 2c of the base plate 11, and the slit portion 23 may be used to prevent air from being blocked.
Referring to fig. 2 and 3, it is specifically illustrated that the bearing 2 and/or the shaft tube 12 has at least one ventilation groove G, and the ventilation groove G is based on the principle of being capable of communicating with the outside, and the shape of the ventilation groove G is not limited, and the invention is not limited by the drawings disclosed in the embodiment; in this embodiment, the number of ventilation grooves G may be plural, the ventilation grooves G may be concavely disposed on the outer circumferential surface 2b of the bearing 2, one end of the ventilation groove G may be located adjacent to the axial end portion 2c of the substrate 11, the other end of the ventilation groove G may be located between the two axial end portions 2c, and the ventilation groove G may be in communication with the through hole 21 and the annular groove 22 of the bearing 2.
The rotor 3 has a rotating member 3a rotatably disposed in the bearing 2, the rotating member 3a may have a central shaft 31 and an expanded diameter ring portion 32, the expanded diameter ring portion 32 is connected to the outer peripheral surface 31a of the central shaft 31, the expanded diameter ring portion 32 may have an upper end edge 32a and a lower end edge 32b, and the shape of the upper end edge 32a and the lower end edge 32b is not limited in the present invention, and in the present embodiment, the upper end edge 32a and the lower end edge 32b are illustrated with a lead angle.
Referring to fig. 2, the rotating member 3a may have at least one first dynamic pressure groove 33a, the at least one first dynamic pressure groove 33a may be located on the outer peripheral surface 30 of the expanding ring portion 32, the at least one first dynamic pressure groove 33a is not adjacent to the upper edge (i.e., the upper end edge 32 a) and the lower edge (i.e., the lower end edge 32 b) of the installation surface of the first dynamic pressure groove 33a, the first dynamic pressure groove 33a may have a curved shape, the ventilation groove G may be communicated with the first dynamic pressure groove 33a via the through hole 21, so that the ventilation groove G may supply air to the first dynamic pressure groove 33a, and the through hole 21 may be directly aligned with the ring groove 34 or form a dislocation, which is not limited in the present invention; the through hole 21 and the ring groove 34 in this embodiment are aligned directly. In the present embodiment, the number of the first dynamic pressure grooves 33a may be plural to provide an appropriate dynamic pressure effect. The rotor 3a may have at least one second dynamic pressure groove 33b, the at least one second dynamic pressure groove 33b may be located on the outer circumferential surface 30 of the diameter-enlarging ring portion 32, and the second dynamic pressure groove 33b may abut against an upper edge (i.e., the upper end edge 32 a) or a lower edge (i.e., the lower end edge 32 b) of the installation surface of the second dynamic pressure groove 33b, so that the external air flow may enter the second dynamic pressure groove 33b through the upper end edge 32a or the lower end edge 32 b; in the present embodiment, the number of the second dynamic pressure grooves 33b is described in plural.
Referring to fig. 1 and 3, the rotating member 3a may have a ring groove 34, and the ring groove 34 may be located on the outer peripheral surface 30 of the expanding ring portion 32; the shape of the ring groove 34 is not limited in the present invention, for example: the ring groove 34 may be formed of a plurality of discrete grooves, and in this embodiment, the ring groove 34 forms an entire ring for illustration. The ring groove 34 may be diametrically opposed to the ring groove 22 of the bearing 2, the ring groove 34 may communicate with the first dynamic pressure groove 33a, and the vent groove G may communicate with the ring groove 34 to supply air to the first dynamic pressure groove 33 a. The rotating member 3a may have a drop-off preventing groove 35, and the drop-off preventing groove 35 may be located adjacent to the base plate 11 and on the central shaft 31.
In addition, the rotor 3 may have a second magnetic member 3b, the second magnetic member 3b is located in the shaft tube 12, the second magnetic member 3b may be formed in a ring shape, the second magnetic member 3b may preferably be attached to the outer circumferential surface 31a of the central shaft 31, the second magnetic member 3b may rotate along with the rotating member 3a, and the second magnetic member 3b may be radially opposite to the first magnetic member 13 located in the base 1; by means of the second magnetic member 3b and the first magnetic member 13 being magnetically opposite to each other, a magnetic center is formed, so that the rotating member 3a can be pulled back by the magnetic center and rotated while maintaining the same position when being deviated.
Referring to fig. 3, a motor with the pneumatic bearing structure of the above embodiment includes a stator 4, where the stator 4 is combined with the base 1 to be disposed around the shaft tube 12, and the stator 4 may be of various structural designs capable of driving the rotor 3 to rotate. In this embodiment, the stator 4 may be optionally sleeved on the outer peripheral surface of the shaft tube 12.
In detail, the rotor 3 may have a housing 3c connected to the central shaft 31, and the present invention is not limited to the structure and manner of connecting the housing 3c and the housing 3c to the central shaft 31. For example, the housing 3c may be injection-coated to the central shaft 31, or may be tightly fitted to the central shaft 31 by laser welding. In this embodiment, the housing 3c can be tightly combined with the central shaft 31, so that the housing 3c and the central shaft 31 can be firmly combined. The rotor 3 may further have a permanent magnet 3d coupled to an inner circumferential surface of the housing 3c, and the permanent magnet 3d may be, for example, a magnetic ring or composed of a plurality of magnetic blocks, which is not limited in the present invention. The permanent magnet 3d is located at the stator 4, and an air gap may be formed between the permanent magnet 3d and the stator 4.
The pneumatic bearing structure of the present invention may further comprise a retaining ring 5, the central shaft 31 of the rotating member 3a may penetrate through the retaining ring 5, and the retaining ring 5 may extend into the anti-falling groove 35 of the rotating member 3 a; in this way, when the rotating member 3a rotates, the axial displacement of the rotating member 3a can be further limited, so as to avoid the rotating member 3a from disengaging from the bearing 2.
The pneumatic bearing structure of the present invention may further comprise a spacer 6 coupled to the bearing 2, the spacer 6 being located between an expanded diameter ring portion 32 of the rotating member 3a and the retaining ring 5, the spacer 6 being configured to press against the retaining ring 5, thereby fixing the position of the retaining ring 5.
In the pneumatic bearing structure of the present embodiment, when the rotating member 3a rotates, the external air flow can enter the ring groove 34 through the plurality of ventilation grooves G, so that the plurality of ventilation grooves G can supply air to the first dynamic pressure groove 33a located between the upper end edge 32a and the lower end edge 32b, and the external air flow can enter the second dynamic pressure groove 33b through the upper end edge 32a or the lower end edge 32b, so that a uniform, stable and strong air pressure film can be formed between the rotating member 3a and the bearing 2 to provide sufficient dynamic pressure, which can have the effect of improving dynamic pressure effect, so that the rotating member 3a can maintain smooth rotation. Furthermore, since the second magnetic member 3b of the rotor 3 is radially opposite to the first magnetic member 13 located at the base 1; in this way, the rotor 3a preferably remains idle, while also suppressing axial displacement of the rotor 3 a.
Referring to fig. 4 and 5, in a second embodiment of the pneumatic bearing structure of the present invention, the ventilation groove G may penetrate through the inner circumferential surface 2a and the outer circumferential surface 2b of the bearing 2, and one end of the ventilation groove G may be located at the axial end 2c of the substrate 11, so that the structure is simple and easy to manufacture, and has the effect of reducing the manufacturing cost. And the external air flow can directly enter the ring groove 34 from the axial end 2c adjacent to the base plate 11 through the plurality of ventilation grooves G, so that the plurality of ventilation grooves G can easily supply air to the first dynamic pressure groove 33a arranged between the upper end edge 32a and the lower end edge 32b, and a uniform, stable and strong air pressure film can be formed between the rotating member 3a and the bearing 2, so as to provide enough dynamic pressure and have the function of improving dynamic pressure effect.
In addition, the retaining ring 5 may be coupled to the outer circumferential surface of the anti-release groove 35, and the spacer 6 is coupled to the bearing 2 and located between the enlarged diameter ring portion 32 and the retaining ring 5; thus, when the rotating member 3a rotates, the retaining ring 5 can limit the axial displacement of the rotating member 3a, so as to prevent the rotating member 3a from disengaging from the bearing 2.
Referring to fig. 6, which shows a third embodiment of the pneumatic bearing structure of the present invention, the ventilation groove G may be concavely disposed on the inner circumferential surface 2a of the bearing 2, and one end of the ventilation groove G may be located at the axial end 2c of the substrate 11, so that the structure is simple and convenient to manufacture, and has the effect of reducing the manufacturing cost. And the external air flow can directly enter the ring groove 34 from the axial end 2c adjacent to the base plate 11 through the plurality of ventilation grooves G, so that the plurality of ventilation grooves G can easily supply air to the first dynamic pressure groove 33a arranged between the upper end edge 32a and the lower end edge 32b, and a uniform, stable and strong air pressure film can be formed between the rotating member 3a and the bearing 2, so as to provide enough dynamic pressure and have the function of improving dynamic pressure effect.
The first magnetic element 13 and the second magnetic element 3b are located adjacent to the base plate 11, the second magnetic element 3b may be located between the expanding ring portion 32 and the retaining ring 5, and the second magnetic element 3b may be radially opposite to the first magnetic element 13 located on the base 1; by means of the second magnetic member 3b and the first magnetic member 13 being magnetically opposite to each other, a magnetic center is formed, so that the rotating member 3a can be pulled back by the magnetic center and rotated while maintaining the same position when being deviated.
Referring to fig. 7, which shows a fourth embodiment of the pneumatic bearing structure of the present invention, two ends of the ventilation groove G may be located at two axial ends 2c of the bearing 2, and external air flow may enter the ring groove 34 from the two axial ends 2c through the ventilation grooves G, so that the ventilation grooves G may provide more dynamic pressure to the first dynamic pressure groove 33a located between the upper end edge 32a and the lower end edge 32b, and a uniform, stable and strong air pressure film may be formed between the rotating member 3a and the bearing 2, thereby further improving the dynamic pressure effect.
In addition, the retaining ring 5 may be located at one end far away from the base plate 11, and the first magnetic member 13 and the bearing 2 respectively abut against two ends of the retaining ring 5, the spacer 6 may be located at the periphery of the central shaft 31 and radially opposite to the retaining ring 5, and the second magnetic member 3b and the expanding ring portion 32 may respectively abut against two ends of the spacer 6, the spacer 6 may be used to separate the second magnetic member 3b from the expanding ring portion 32, so that the retaining ring 5 may easily extend into a portion between the second magnetic member 3b and the expanding ring portion 32, and an aperture D1 of a through hole 51 of the retaining ring 5 may be preferably smaller than a maximum diameter D2 of the rotating member 3 a; in this way, when the rotating member 3a rotates, the axial displacement of the rotating member 3a can be further limited, so as to avoid the rotating member 3a from disengaging from the bearing 2.
Referring to fig. 8, which shows a fifth embodiment of the pneumatic bearing structure of the present invention, the inner circumferential surface 12a of the shaft tube 12 may have an air inlet 111, one end of the air inlet 111 may be adjacent to the substrate 11, the other end of the air inlet 111 may be aligned with the through hole 21 of the bearing 2, and the air inlet 111 and the through hole 21 may together form the air vent G, so that the structure is simple and easy to manufacture, and has the effect of reducing manufacturing cost. And the external air flow can enter the ring groove 34 from the air inlet channel 111 and the through hole 21, so that the plurality of ventilation grooves G can supply air to the first dynamic pressure groove 33a arranged between the upper end edge 32a and the lower end edge 32b, and a uniform, stable and strong air pressure film can be formed between the rotating member 3a and the bearing 2, so as to provide enough dynamic pressure and have the effect of improving dynamic pressure effect.
In addition, in the present embodiment, the central shaft 31 and the expanding ring portion 32 may be integrally formed and connected, so as to improve the structural strength of the rotating member 3 a.
In summary, according to the pneumatic bearing structure and the motor having the pneumatic bearing structure of the present invention, the bearing or/and the shaft tube has at least one ventilation groove, and the ventilation groove can be communicated with the at least one first dynamic pressure groove and the outside; therefore, the external air flow can supply air to the first dynamic pressure groove arranged between the upper end edge and the lower end edge through the ventilation groove, and the external air flow can enter the second dynamic pressure groove through the upper end edge or the lower end edge, so that a uniform, stable and strong air pressure film can be formed between the rotating piece and the bearing, sufficient dynamic pressure can be provided, and the dynamic pressure effect can be improved.
Claims (18)
1. A pneumatic bearing structure comprising:
A base having a shaft tube;
A bearing coupled to the shaft tube; and
The rotor is provided with a rotating piece which is rotatably arranged on the bearing, the peripheral surface of the rotating piece is provided with at least one first dynamic pressure groove and at least one second dynamic pressure groove, the first dynamic pressure groove is not adjacent to the upper end edge and the lower end edge of the rotating piece, and the second dynamic pressure groove is adjacent to the upper end edge or the lower end edge of the rotating piece;
The bearing or/and the shaft tube is provided with at least one ventilation groove, the at least one ventilation groove is concavely arranged on the outer circumferential surface of the bearing, and the ventilation groove is aligned by a through hole of the bearing and communicated with the first dynamic pressure groove, so that the external air flow is communicated with the ventilation groove and the at least one first dynamic pressure groove.
2. The pneumatic bearing structure of claim 1, wherein the outer circumferential surface of the rotating member has a ring groove communicating with the first dynamic pressure groove, and the ventilation groove communicates with the ring groove to supply air to the first dynamic pressure groove.
3. The pneumatic bearing structure of claim 1, wherein the at least one vent groove is recessed in an inner peripheral surface of the bearing.
4. The pneumatic bearing structure of claim 1, wherein the through hole penetrates through the inner peripheral surface and the outer peripheral surface of the bearing, and the inner peripheral surface of the shaft tube has an air inlet channel, and the air inlet channel and the through hole together form the at least one ventilation channel.
5. The pneumatic bearing structure of claim 1, wherein one end of the at least one vent groove is located at one of the axial ends of the bearing, and the other end of the at least one vent groove communicates with the first dynamic pressure groove.
6. The pneumatic bearing structure of claim 1, wherein the outer peripheral surface of the rotating member has a ring groove communicating with the first dynamic pressure groove, both ends of the at least one ventilation groove are respectively located at both axial ends of the bearing, and the bearing has a through hole aligning with the ring groove and communicating with the at least one ventilation groove.
7. The pneumatic bearing structure of claim 1, wherein the outer circumferential surface of the rotating member has a circumferential groove communicating with the first dynamic pressure groove, the inner circumferential surface of the bearing is concavely provided with a circumferential groove radially opposite to the circumferential groove of the rotor, and the at least one ventilation groove communicates with the circumferential groove.
8. The pneumatic bearing structure of claim 1 wherein the shaft tube has a first magnetic member therein and the rotor has a second magnetic member located within the shaft tube and radially opposite the first magnetic member.
9. The pneumatic bearing structure of claim 1, wherein the rotating member has a central shaft and an enlarged diameter ring portion connected to an outer peripheral surface of the central shaft, the first dynamic pressure groove is located in the enlarged diameter ring portion, and the rotor has a second magnetic member located on the outer peripheral surface of the central shaft.
10. The pneumatic bearing structure of claim 9, wherein the central shaft is integrally formed with the enlarged diameter ring portion.
11. The pneumatic bearing structure of claim 1, wherein the rotating member has an enlarged diameter ring portion, the upper end edge and the lower end edge being located at the enlarged diameter ring portion, the upper end edge and the lower end edge forming the lead angle.
12. The pneumatic bearing structure of claim 1, wherein at least one axial end of the bearing has a slit portion.
13. The pneumatic bearing structure of claim 1, further comprising a retaining ring through which the rotating member extends, the retaining ring extending into an anti-slip groove of the rotating member.
14. The pneumatic bearing assembly of claim 13, further comprising a spacer coupled to the bearing, the spacer being positioned between an enlarged diameter ring portion of the rotating member and the retaining ring.
15. The pneumatic bearing assembly of claim 1, further comprising a retaining ring having a first magnetic member disposed within the shaft tube, the rotor having a second magnetic member disposed within the shaft tube and radially opposite the first magnetic member, the first magnetic member and the bearing respectively abutting opposite ends of the retaining ring, a through hole aperture of the retaining ring being smaller than the maximum radial width of the rotating member.
16. The pneumatic bearing structure of claim 15, further comprising a spacer, wherein the second magnetic member and an enlarged ring portion of the rotating member abut against respective ends of the spacer.
17. A pneumatic bearing structure comprising:
A base having a shaft tube;
A bearing coupled to the shaft tube; and
The rotor is provided with a rotating piece which is rotatably arranged on the bearing, the peripheral surface of the rotating piece is provided with at least one first dynamic pressure groove and at least one second dynamic pressure groove, the first dynamic pressure groove is not adjacent to the upper end edge and the lower end edge of the rotating piece, and the second dynamic pressure groove is adjacent to the upper end edge or the lower end edge of the rotating piece;
The bearing or/and the shaft tube is provided with at least one ventilation groove, and the at least one ventilation groove penetrates through the inner peripheral surface and the outer peripheral surface of the bearing, so that the external air flow is communicated with the at least one ventilation groove and the at least one first dynamic pressure groove.
18. A motor, comprising:
a stator disposed around the shaft tube; and
A pneumatic bearing structure as claimed in any one of claims 1 to 17, the rotor having a permanent magnet pair located at the stator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW109142904A TWI769608B (en) | 2020-12-04 | 2020-12-04 | Pneumatic pressure bearing structure and motor thereof |
| TW109142904 | 2020-12-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114593137A CN114593137A (en) | 2022-06-07 |
| CN114593137B true CN114593137B (en) | 2024-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011472390.4A Active CN114593137B (en) | 2020-12-04 | 2020-12-15 | Pneumatic pressure bearing structure and motor with same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114593137B (en) |
| TW (1) | TWI769608B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63142422U (en) * | 1987-03-11 | 1988-09-20 | ||
| JP2002266851A (en) * | 2001-03-09 | 2002-09-18 | Ricoh Co Ltd | High speed rotating unit |
| JP2009180294A (en) * | 2008-01-30 | 2009-08-13 | Mitsumi Electric Co Ltd | Dynamic pressure bearing motor |
| CN111749978A (en) * | 2019-03-29 | 2020-10-09 | 日本电产株式会社 | Gas dynamic pressure bearing, motor, and blower |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5890055U (en) * | 1981-12-11 | 1983-06-18 | 株式会社東芝 | brushless electric motor |
| JPS63142422A (en) * | 1986-12-05 | 1988-06-14 | Hitachi Ltd | Method for extracting frequency appearing character string |
| JPS6479416A (en) * | 1987-09-18 | 1989-03-24 | Nippon Denso Co | Hydrostatic bearing device |
| JPH11190825A (en) * | 1997-12-26 | 1999-07-13 | Fuji Xerox Co Ltd | Optical deflecting device |
| JP4127035B2 (en) * | 2002-12-02 | 2008-07-30 | 松下電器産業株式会社 | Hydrodynamic bearing device and disk recording device |
-
2020
- 2020-12-04 TW TW109142904A patent/TWI769608B/en active
- 2020-12-15 CN CN202011472390.4A patent/CN114593137B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63142422U (en) * | 1987-03-11 | 1988-09-20 | ||
| JP2002266851A (en) * | 2001-03-09 | 2002-09-18 | Ricoh Co Ltd | High speed rotating unit |
| JP2009180294A (en) * | 2008-01-30 | 2009-08-13 | Mitsumi Electric Co Ltd | Dynamic pressure bearing motor |
| CN111749978A (en) * | 2019-03-29 | 2020-10-09 | 日本电产株式会社 | Gas dynamic pressure bearing, motor, and blower |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI769608B (en) | 2022-07-01 |
| CN114593137A (en) | 2022-06-07 |
| TW202223256A (en) | 2022-06-16 |
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