TWI389429B - Motor - Google Patents

Description

motor

The present invention relates to a motor, and more particularly to a motor structure having a non-metallic shaft tube.

The conventional motors that are commonly available on the market can be roughly divided into a motor with a metal shaft tube and a motor with a plastic shaft tube. Among them, please refer to Figure 1, as stated in the Republic of China Bulletin No. 384947 The patent of the metal tube of a fan motor and its bearing structure discloses a motor crucible having a metal shaft tube. The conventional motor 7 has a metal shaft tube 71 coupled to a housing 72 and has a fixed sub-seat 73 tightly fitted to the outer peripheral wall of the metal shaft tube 71. In addition, a plurality of bearings are disposed in the metal shaft tube 71. 74. The plurality of bearings 74 are pivotally coupled to a rotor 75.

However, the conventional motor 7 is difficult in the processing steps of the metal shaft tube 71, and it is necessary to waste the extra manpower to assemble the metal shaft tube 71 to the housing 72, which causes inconvenience in assembly and relatively increases manufacturing. cost.

As shown in Fig. 2, a motor crucible having a plastic shaft tube is disclosed. The conventional motor 8 mainly includes a base 81, a stator 82 and a rotor 83. The base 81 has a plastic shaft tube 811, and a bearing 812 is disposed in the plastic shaft tube 811; the stator 82 is coupled to the outer circumferential surface of the plastic shaft tube 811; the rotor 83 rotatably couples the bearing 812; The stator 82 can drive the rotor 83 to rotate.

The plastic shaft tube 811 of the conventional motor 8 can be integrally injection molded. Therefore, compared with the motor 7 having the metal shaft tube 71 described above, it has the advantages of easy molding, convenient assembly, and reduced manufacturing cost; however, The motor 8 of the plastic shaft tube 811 can solve the related problems of the motor 7 having the metal shaft tube 71. However, in the actual assembly process, the plastic shaft tube 811 and the bearing 812 are generally combined with each other in a tight fit manner. If the bonding state between the plastic shaft tube 811 and the bearing 812 is too tight, the plastic shaft tube 811 will be excessively pressed against the bearing 812; at this time, since the motor 8 is not provided to prevent the deformation of the bearing 812. The structural design thus causes the bearing 812 to be easily subjected to excessive compression of the plastic shaft tube 811 to cause deformation, damage or center deviation, and the like, thereby reducing the service life of the motor 8.

In order to improve the related problems that may occur in the above-mentioned motor 8 having a plastic shaft tube, please refer to FIG. 3, which is a patent case of the improved structure of the DC fan bearing fixture of the Republic of China Announcement No. 519259; The motor 9 has a shaft seat 91, and the shaft seat 91 is provided with a hollow ring groove 911, so that the shaft seat 91 forms a double-layer structure composed of an inner ring 912 and an outer ring 913; thereby, the inner ring 912 can be A bearing 92 is coupled to the outer ring 913, and a certain sub-group 93 is disposed outside the outer ring 913, and a retaining ring 94 is disposed in the hollow ring groove 911 to support the outer ring 913 by the retaining ring 94 to prevent the shaft seat. The deformation is generated to prevent the shaft seat 91 from excessively pressing the bearing 92. However, the structural composition of the shaft seat 91 of the conventional motor 9 is too complicated, which in turn causes the formation of the shaft seat 91 to be more difficult, and there is still a need for improvement.

SUMMARY OF THE INVENTION The object of the present invention is to provide a motor for solving the problem that a non-metallic shaft tube of a conventional motor is easily over-compressed when assembled.

Another object of the present invention is to provide a motor that can effectively prevent a non-metallic shaft tube from excessively pressing a bearing by a simple structural design.

The motor of the present invention includes at least a base, a subset and a rotor. The base is provided with a non-metallic shaft tube having a pair of outer peripheral walls and an inner peripheral wall, and an opening is formed at one end of the non-metallic shaft tube, and at least one bearing is disposed in the non-metallic shaft tube. The bearing is provided with a shaft hole, and the inner peripheral wall of the non-metallic shaft tube and the outer peripheral surface of the bearing have a plurality of tight fitting portions, and in the circumferential range of the non-metallic shaft tube, each of the tight fitting portions has an adjusting gap The stator assembly is coupled to the base; the rotor has a central shaft that engages the shaft bore of the at least one bearing.

Another motor of the present invention includes at least a base, a subset and a rotor. The base is provided with a non-metallic shaft tube having a pair of outer peripheral walls and an inner peripheral wall, and an opening is formed at one end of the non-metallic shaft tube, and at least one bearing is disposed in the non-metallic shaft tube. The bearing is provided with a shaft hole; the stator assembly is coupled to the base; the rotor has a central shaft, the central shaft is coupled with the shaft hole of the at least one bearing, and the central shaft is formed between the shaft shaft and the hole wall of the bearing shaft hole A buffer gap.

The above and other objects, features, and advantages of the present invention will become more apparent from the description of the appended claims. The motor of the first embodiment of the present invention comprises at least a base 1, a certain subset 2 and a rotor 3. The base 1 can be coupled to the stator set 2 and the rotor 3; the stator set 2 is used to drive the rotor 3 to rotate.

The base 1 is provided with a non-metallic shaft tube 11. The non-metallic shaft tube 11 is preferably a plastic shaft tube. The non-metallic shaft tube 11 has a pair of outer peripheral walls 111 and an inner peripheral wall 112, and the non-metallic shaft tube 11 is One end forms an opening 113. In addition, the non-metallic shaft tube 11 is provided with at least one bearing 12 through which the at least one bearing 12 can be coupled to the inner peripheral wall 112 of the non-metallic shaft tube 11, as shown in the illustrated embodiment, the number of the bearing 12 is revealed. There is one, and the bearing 12 is provided with a shaft hole 121.

More specifically, as shown in FIG. 5, the inner peripheral wall 112 of the non-metallic shaft tube 11 and the outer peripheral surface of the bearing 12 have a plurality of tight fitting portions 13 thereby making the non-metallic shaft tube 11 and the bearing 12 can be in a tight fit state; in addition, in the circumferential range of the non-metallic shaft tube 11, each of the tight fitting portions 13 has an adjustment gap 14 therebetween.

The stator assembly 2 is coupled to the base 1, and the stator assembly 2 has an assembly hole 21 through which the non-metallic shaft tube 11 can pass. In addition, in the embodiment, the stator set 2 is used to drive the rotor 3 to rotate, and therefore, the stator set 2 can be composed of components such as a silicon steel sheet, a coil or an insulating sleeve (not labeled).

The rotor 3 includes a hub 31 and a permanent magnet 32. The hub 31 is provided with a central shaft 311 rotatably coupled to the shaft hole 121 of the bearing 12; the permanent magnet 32 is an annular body coupled to the inner peripheral wall of the hub 31, and the permanent magnet 32 is There is an air gap between the stator sets 2.

When the motor of the present invention is in actual use, the stator set 2 can generate an alternating magnetic field and interact with the permanent magnet 32 through the air gap, thereby driving the rotor 3 to pivot the central shaft 311 and the shaft hole 121. Rotate for the center.

The main feature of the motor of the present invention is that the bearing 12 can be coupled to the inside of the non-metallic shaft tube 11 in a tight fit by using the plurality of tight fitting portions 13 formed between the non-metallic shaft tube 11 and the bearing 12 Effectively positioning the bearing 12 to achieve a better central positioning effect of the bearing 12 and the central shaft 311; more importantly, since the adjusting gaps 14 are respectively provided between the tight fitting portions 13, even the bearing 12 The non-metallic shaft tube 11 is in a tight fit state, but the adjustment gap 14 can still prevent the non-metallic shaft tube 11 from excessively pressing the bearing 12, thereby effectively avoiding problems such as deformation, damage or center deviation of the bearing 12. Furthermore, when the non-metallic shaft tube 11 is deformed by thermal expansion and contraction, the cushioning action of the adjustment gap 14 can also be utilized to prevent the non-metallic shaft tube 11 from excessively pressing the bearing 12. In general, the adjustment gap 14 is formed between each of the tight fitting portions 13 of the present invention, and the non-metallic shaft tube 11 functions as an elastic deformation space.

Referring to Figures 4 and 5 again, the motor of the present invention may further comprise at least one accessory structural feature or a combination thereof as described below, to further improve the function of the motor of the present invention. The non-metallic shaft tube 11 has an outer diameter (D1) in the radial direction, and the minimum aperture of the assembly hole 21 of the stator assembly 2 may be slightly smaller than the outer diameter of the non-metallic shaft tube 11 ( D1), the ratio of the minimum aperture of the assembly hole 21 to the outer diameter (D1) of the non-metallic shaft tube 11 is preferably defined as 0.96 to 0.999; thereby, when the stator assembly 2 is assembled by the assembly hole 21 When the non-metallic shaft tube 11 is outside the peripheral wall 111, the stator assembly 2 can be coupled to the non-metallic shaft tube 11 in a tight fit manner, so that the joint stability between the stator assembly 2 and the non-metallic shaft tube 11 is better. Furthermore, even if the bonding state between the stator assembly 2 and the non-metallic shaft tube 11 is too tight, the design of the adjustment gap 14 can cause the non-metallic shaft tube 11 to be deformed by the stator assembly 2 to cause deformation. The bearing 13 is not excessively pressed; therefore, when the stator assembly 2 and the non-metallic shaft tube 11 are in a tight fit state, the adjustment gaps 14 are respectively formed between the tight fitting portions 13, and the non-metal is also available. The shaft tube 11 functions as an elastic deformation space.

Preferably, the adjustment gap 14 extends axially between the inner peripheral wall 112 of the non-metallic shaft tube 11 and the outer peripheral surface of the bearing 12, and when the stator assembly 2 and the non-metallic shaft tube 11 are in a tight fit state, As shown in FIG. 4, the assembly surface 21 of the stator assembly 2 has an axial height (H) on the contact surface of the non-metallic shaft tube, whereby the axial extension of the adjustment gap 14 can be The axial height (H) corresponds radially. Therefore, the non-metallic shaft tube 11 is pressed by the stator group 2 to be deformed, and the adjustment gap 14 can be more easily utilized as the elastic deformation space.

The other end of the non-metallic shaft tube 11 can form a closing portion 114. The closing portion 114 can be coupled to the inside of the other end of the non-metallic shaft tube 11 by a support member 15 as shown to form the closing portion 114. Alternatively, the base portion 1 can be directly formed by an integral injection molding method. The other end of the metal shaft tube 11 forms a blind hole portion (not shown), and the blind hole portion is the closed portion 114. Thereby, the closing portion 114 can provide effects such as dustproofing, and when the bonding state between the stator assembly 2 and the non-metallic shaft tube 11 is too close, the closing portion 114 can ensure the other end of the non-metallic shaft tube 11 The amount of deformation is not too large.

The side surface of the closing portion 114 located inside the non-metallic shaft tube 11 may be a flat surface. Thereby, the center shaft 311 can be more easily positioned during assembly and ensures that the verticality of the center shaft 311 after assembly is better.

The non-metallic shaft tube 11 has an inner diameter (D2) in the radial direction, and the inner diameter (D2) refers to the distance between any two relatively tight fitting portions 13, the inner diameter (D2) and The ratio of the maximum outer diameter of the bearing 12 is preferably defined as 0.96 to 0.999, so that the plurality of tight fitting portions 13 can be formed between the non-metallic shaft tube 11 and the bearing 12; thereby, the minimum of the assembly hole 21 When the ratio of the aperture to the outer diameter (D1) of the non-metallic shaft tube 11 is defined as 0.96 to 0.999, the stator group 2, the non-metallic shaft tube 11 and the bearing 12 can be preferably in a tight fit relationship with each other. It is also effective to prevent the non-metallic shaft tube 11 from excessively pressing the bearing 12.

Referring to Figures 6 and 7, a motor according to a second embodiment of the present invention is disclosed. The motor of the present embodiment differs from the motor disclosed in the first embodiment only in the hole of the shaft hole 121 of the bearing 12. A buffer gap 4 is formed between the wall and the outer peripheral surface of the central shaft 311 of the rotor 3; for example, the ratio of the diameter of the shaft hole 121 of the bearing 12 to the outer diameter of the central shaft 311 is preferably defined as 1.001~ 1.03, to form the buffer gap 4; thereby, when the non-metallic shaft tube 11 excessively presses the bearing 12, the bearing 12 can utilize the buffer gap 4 as a buffer deformation space, and the bearing 12 can be prevented from being deformed and damaged. Or many problems such as center deviation. In addition, the buffer gap 4 preferably extends axially between the hole wall of the shaft hole 121 of the bearing 12 and the outer circumferential surface of the central axis 311 of the rotor 3, when the stator assembly 2 and the non-metallic shaft tube 11 are tight. In the mating state, as shown in FIGS. 6 and 7, the contact surface of the assembly hole 21 of the stator assembly 2 and the non-metallic shaft tube 11 have an axial height (H), whereby the buffer gap The axial extent of 4 may correspond radially to the axial height (H). Therefore, the non-metallic shaft tube 11 is pressed by the stator group 2 to deform the portion, and the buffer gap 4 can be more easily utilized as the elastic deformation space.

More specifically, as shown in FIG. 6, the hole wall of the shaft hole 121 of the bearing 12 may form a groove 122 to form the buffer gap 4 by the groove 122; or, as shown in FIG. 7, The outer peripheral surface of the center shaft 311 may be formed with a notch 311a which is aligned with the bearing 12 so as to form the buffer gap 4 by the notch 311a.

Further, the motor of the second embodiment of the present invention is also applicable to the various subsidiary structural features described above. In addition, the buffer gap 4 formed by the motor of the second embodiment of the present invention is preferably designed in combination with the tight fitting portion 13 and the adjusting gap 14 of the first embodiment of the present invention, so that the motor of the second embodiment is compared. The motor of the first embodiment can more effectively prevent the non-metallic shaft tube 11 from excessively pressing the bearing 12 to cause deformation, damage or center deviation; or the motor of the second embodiment of the present invention can also omit the tight fit. The structure of the portion 13 and the adjustment gap 14 is designed to achieve the same effect using only the buffer gap 4.

The motors of the first and second embodiments of the present invention are further applicable to a cooling fan structure such as a blower type cooling fan or an axial flow type cooling fan. Referring to FIG. 8, it is disclosed that the motor of the present invention is applied to an axial flow type cooling fan (taking the motor of the first embodiment as an example); wherein the base 1 can directly be connected by a plurality of connecting members 51 (such as ribs or static). A frame 5 is externally connected to form a frame structure having an air inlet 52 and an air outlet 53. In addition, the hub 31 of the rotor 3 can radially extend a plurality of blades 312. Therefore, the cooling fan can be installed on various electronic devices or electronic instruments. When the rotor 3 is rotated, the blade 312 can introduce an external airflow from the air inlet 52, and the airflow is derived from the air outlet 53. Go to a heat source location to achieve the desired heat dissipation.

It can be seen that the motor of the present invention can be designed by the simple design of at least one of the adjustment gap 14 and the buffer gap 4, and the non-metallic shaft tube 11 can be used as an elastic deformation space to effectively solve the problem of the motor. When assembled, the non-metallic shaft tube 11 easily overstresses the bearing 12 to ensure that the bearing 12 does not cause deformation, damage or center deviation, and the assembly convenience can be improved; thereby, the lifting can be improved. Motor life, reduce rotation noise and improve product quality.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

[this invention]

1. . . Pedestal

11. . . Non-metallic shaft tube

111. . . Peripheral wall

112. . . Inner peripheral wall

113. . . Opening

114. . . Closed part

12. . . Bearing

121. . . Shaft hole

122. . . Groove

13. . . Tight fit

14. . . Adjustment gap

15. . . supporting item

2. . . Stator group

twenty one. . . Assembly hole

3. . . Rotor

31. . . Wheel hub

311. . . The central axis

311a. . . Missing slot

312. . . blade

32. . . permanent magnet

4. . . Buffer gap

5. . . framework

51. . . Connector

52. . . Air inlet

53. . . Air outlet

[知知]

7. . . motor

71. . . Metal shaft tube

72. . . Shell

73. . . Stator seat

74. . . Bearing

75. . . Rotor

8. . . motor

81. . . Pedestal

811. . . Shaft tube

812. . . Bearing

82. . . stator

83. . . Rotor

9. . . motor

91. . . Shaft seat

911. . . Hollow ring groove

912. . . Inner ring

913. . . Outer ring

92. . . Bearing

93. . . Stator group

94. . . Stop ring

Fig. 1 is a cross-sectional view showing a combination of a motor having a metal shaft tube.

Fig. 2 is a cross-sectional view showing a combination of a motor having a plastic shaft tube.

Figure 3: A cross-sectional view of another conventional motor.

Fig. 4 is a sectional view showing the combination of the motor of the first embodiment of the present invention.

Fig. 5 is a plan sectional view showing the motor of the first embodiment of the present invention.

Figure 6 is a sectional view (1) of the combination of the motor of the second embodiment of the present invention.

Figure 7 is a sectional view (II) of the combination of the motor of the second embodiment of the present invention.

Fig. 8 is a sectional view showing the combination of the motor of the present invention as a heat radiating fan.

11. . . Non-metallic shaft tube

111. . . Peripheral wall

112. . . Inner peripheral wall

12. . . Bearing

121. . . Shaft hole

13. . . Tight fit

14. . . Adjustment gap

311. . . The central axis

Claims (19)

A motor comprising: a base, a non-metallic shaft tube having a relatively outer peripheral wall and an inner peripheral wall, and an opening formed at one end of the non-metallic shaft tube, the non-metallic shaft tube being disposed at least a bearing, the at least one bearing is provided with a shaft hole, and the inner peripheral wall of the non-metallic shaft tube and the outer peripheral surface of the bearing have a plurality of tight fitting portions, and in the circumferential range of the non-metallic shaft tube, each of the tight fitting portions Each has an adjustment gap; a certain subgroup is coupled to the base; and a rotor having a central shaft coupled to the shaft hole of the at least one bearing, wherein the non-metallic shaft tube has an inner portion in the radial direction The diameter of the tube, the ratio of the inner diameter to the maximum outer diameter of the bearing is defined as 0.96 to 0.999 to form the plurality of tight fitting portions. The motor of claim 1, wherein a gap is formed between a hole wall of the shaft hole of the bearing and a central axis of the rotor. The motor of claim 2, wherein the hole wall of the shaft hole of the bearing forms a groove, and the groove forms the buffer gap. The motor according to claim 2, wherein the outer peripheral surface of the central shaft forms a notch, and the missing groove forms the buffer gap. The motor of claim 2, wherein a ratio of an aperture of the shaft hole of the bearing to an outer diameter of the central shaft is defined as 1.001 to 1.03 to form the buffer gap. The motor of claim 1, 2, 3, 4 or 5, wherein the non-metallic shaft tube has an outer diameter in a radial direction, the stator assembly has an assembly hole, and the assembly hole is coupled to the non-metal The outer peripheral wall of the shaft tube, and the smallest hole diameter of the assembly hole is smaller than the outer diameter of the non-metallic shaft tube. The motor of claim 6, wherein the adjustment gap extends axially between the inner peripheral wall of the non-metallic shaft tube and the outer peripheral surface of the bearing, and the assembly hole of the stator assembly and the non-metallic shaft tube are tight The mating contact surface has an axial height, and the axial extent of the adjustment gap corresponds radially to the axial height. The motor of claim 6, wherein a ratio of a minimum aperture of the assembled hole of the stator set to a diameter other than the non-metallic shaft tube is defined as 0.96 to 0.999. The motor of claim 1, 2, 3, 4 or 5, wherein the other end of the non-metallic shaft tube forms a closed portion. The motor of claim 9, wherein the other end of the non-metallic shaft tube forms a blind hole portion, and the blind hole portion is the closed portion. The motor of claim 9, wherein the other end of the non-metallic shaft tube is internally coupled with a support member to form the closure portion. The motor of claim 9, wherein the closing portion is located on a side surface of the interior of the non-metallic shaft tube. The motor of claim 1, 2, 3, 4 or 5, wherein the base is connected to a frame by a plurality of connecting members to form a fan frame structure having an air inlet and an air outlet. The rotor extends radially through a plurality of blades. A motor comprising: a base, a non-metallic shaft tube having at least one bearing therein, the at least one bearing being provided with a shaft hole; a certain subset being coupled to the base; and a rotor Having a central shaft, the central shaft is coupled with the shaft hole of the at least one bearing, and a buffer gap is formed between the outer peripheral surface of the central shaft and the hole wall of the shaft hole of the bearing, and the hole wall of the shaft hole of the bearing forms a concave a groove that forms the buffer gap. The motor of claim 14, wherein the buffer gap extends axially between a hole wall of the shaft hole of the bearing and an outer circumferential surface of the central axis of the rotor, the stator set and the non-metallic shaft pipe system In the tight fit, the contact surface of the stator assembly and the non-metallic shaft tube has an axial height, and the axial extension of the buffer gap corresponds to the axial height. A motor comprising: a base, a non-metallic shaft tube having at least one bearing therein, the at least one bearing being provided with a shaft hole; a certain subset being coupled to the base; and a rotor Having a central shaft, the central shaft is coupled with the shaft hole of the at least one bearing, and a buffer gap is formed between the outer peripheral surface of the central shaft and the hole wall of the shaft hole of the bearing, and the outer peripheral surface of the central shaft forms a slot. The missing groove forms the buffer gap. The motor of claim 16, wherein the buffer gap extends axially between a hole wall of the shaft hole of the bearing and an outer peripheral surface of the central axis of the rotor, the stator set and the non-metallic shaft pipe system Tight fit, The contact surface of the stator assembly and the non-metallic shaft tube has an axial height, and the axial extension of the buffer gap corresponds to the axial height. A motor comprising: a base, a non-metallic shaft tube having at least one bearing therein, the at least one bearing being provided with a shaft hole; a certain subset being coupled to the base; and a rotor Having a central shaft, the central shaft is coupled with the shaft hole of the at least one bearing, and a buffer gap is formed between the outer peripheral surface of the central shaft and the hole wall of the shaft hole of the bearing, and the hole wall of the shaft hole of the bearing forms a concave The groove forms the buffer gap, and the ratio of the diameter of the shaft hole of the bearing to the outer diameter of the central axis is defined as 1.001~1.03 to form the buffer gap. The motor of claim 18, wherein the buffer gap extends axially between a hole wall of the shaft hole of the bearing and an outer circumferential surface of the central axis of the rotor, the stator set and the non-metallic shaft pipe system In the tight fit, the contact surface of the stator assembly and the non-metallic shaft tube has an axial height, and the axial extension of the buffer gap corresponds to the axial height.