TWI497880B - Motor and its motor bearing structure - Google Patents

Description

Motor and its motor bearing structure

The present invention relates to a motor and its motor bearing structure.

In order to maintain the stability of the rotating shaft, the conventional motor needs to support the rotating shaft by using a bearing structure. For example, the "cooling fan with dual bearings" disclosed in the Chinese Patent No. 439883 uses a ball bearing and an oil bearing to support the shaft of the impeller. However, although the bearing structure described above can provide a sufficient supporting area to support the rotating shaft, the frictional relationship between the bearing structure and the rotating shaft is not considered in the structural design, so that the bearing structure and the rotating shaft often have abnormal wear due to too large friction area. And generate noise, which in turn affects the stability of the shaft when it is rotated.

Therefore, it is necessary to provide an innovative and progressive motor and its motor bearing structure to solve the above problems.

The present invention provides a motor comprising: a base having a shaft tube; a motor bearing structure disposed in the shaft tube of the base, the motor bearing structure comprising at least two bearings, the at least two bearings comprising at least one oil bearing, the at least An oil-impregnated bearing has a shaft hole and an axial length L, the shaft hole includes at least one tapered portion and a supporting portion, the supporting portion communicates with the tapered portion, the supporting portion has a supporting length X, and the supporting length X satisfies Relational formula: L/15≦X≦2L/3; a rotating shaft is disposed through the shaft hole of the at least one oil bearing, the support portion of the shaft hole supports the rotating shaft; and the stator is disposed on the shaft tube of the base Outside.

The invention further provides a motor bearing structure comprising at least two bearings, the at least two The bearing includes at least one oil bearing, the at least one oil bearing has a shaft hole and an axial length L, the shaft hole includes at least one tapered portion and a supporting portion, the supporting portion communicates with the tapered portion, the supporting portion has a The support length X, which satisfies the relationship: L/15≦X≦2L/3.

The present invention ensures that the support area provided by the support portion of the at least one oil-impregnated bearing is sufficient to maintain the stability of the rotating shaft, and at the same time reduce the friction area of the rotating shaft and the supporting portion and prevent noise generation.

The embodiments of the present invention can be more clearly understood, and the objects, features, and advantages of the present invention will become more apparent. The details are as follows.

10‧‧‧ motor

11‧‧‧Base

111‧‧‧ shaft tube

12‧‧‧Motor bearing structure

12A‧‧‧bearings, oil-impregnated bearings

12B‧‧‧ bearing

120a‧‧‧ first end face

120b‧‧‧second end face

121‧‧‧Axis hole

122‧‧‧The tapered part, the first tapered part

122a‧‧‧first opening

122b‧‧‧second opening

123‧‧‧Second gradual

123a‧‧‧ third opening

123b‧‧‧fourth opening

124‧‧‧Support

13‧‧‧ shaft

14‧‧‧ Stator

15‧‧·wheels

D1‧‧‧Diameter of the first opening

D2‧‧‧ diameter of the second opening

D3‧‧‧Diameter of the third opening

D4‧‧‧ diameter of the fourth opening

HD‧‧‧Aperture of the support

L‧‧‧ axial length

X‧‧‧Support length

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing the structure of a motor bearing of the motor bearing structure of the present invention; and Fig. 3 is a cross-sectional view showing the structure of an oil bearing of the motor bearing structure of the present invention.

Referring to Figure 1, there is shown a cross-sectional view of the structure of the motor of the present invention. The motor 10 of the present invention includes a base 11, a motor bearing structure 12, a shaft 13 and a stator 14. The base 11 has a shaft tube 111.

Fig. 2 is a perspective view showing the structure of an oil bearing of the motor bearing structure of the present invention. Figure 3 is a cross-sectional view showing the structure of an oil bearing of the motor bearing structure of the present invention. Referring to FIG. 1 , FIG. 2 and FIG. 3 , the motor bearing structure 12 is disposed in the shaft tube 111 of the base 11 , and the stator 14 is disposed outside the shaft tube 111 of the base 11 . The motor bearing structure 12 includes at least two bearings 12A, 12B that include at least one oil bearing 12A, and the other bearing 12B can be a ball bearing or an oil bearing.

The at least one oil bearing 12A has a first end surface 120a, a second end surface 120b, a shaft hole 121 and an axial length L. The shaft hole 121 communicates with the first end surface 120a and the second End face 120b. The shaft hole 121 includes at least one tapered portion 122 and a supporting portion 124 that communicates with the tapered portion 122. In the embodiment, the shaft hole 121 includes a first tapered portion 122 , a second tapered portion 123 , and the supporting portion 124 .

The aperture of the first tapered portion 122 tapers from the first end surface 120a toward the support portion 124, and the first tapered portion 122 has a first opening 122a and a second opening 122b. The first opening 122a communicates with the first end surface 120a, and the second opening 122b communicates with the supporting portion 124. In this embodiment, the diameter D1 of the first opening 122a is larger than the diameter D2 of the second opening 122b, and the The diameter D2 of the second opening 122b is equal to the aperture HD of the support portion 124.

The second tapered portion 123 is opposite to the first tapered portion 122 . The first tapered portion 122 and the second tapered portion 123 are oppositely disposed on the upper and lower sides of the supporting portion 124 . The aperture of the second tapered portion 123 tapers from the second end surface 120b toward the support portion 124, and the second tapered portion 123 has a third opening 123a and a fourth opening 123b. The third opening 123a communicates with the second end surface 120b. The fourth opening 123b communicates with the support portion 124. In this embodiment, the diameter D4 of the fourth opening 123b is equal to the aperture HD of the support portion 124, and the third The diameter D3 of the opening 123a is equal to the diameter D1 of the first opening 122a of the first tapered portion 122. In addition, the length of the second tapered portion 123 may be different from the length of the first tapered portion 122.

The support portion 124 is located between the first tapered portion 122 and the second tapered portion 123, and the support portion 124 has a single aperture HD and a support length X. In the present embodiment, the support length X satisfies the relationship: L/15≦X≦2L/3, and preferably, the axial length L is 1 to 6 mm.

The shaft 13 is disposed through the shaft hole 121 of the at least one oil bearing 12A, and the support portion 124 of the shaft hole 121 supports the shaft 13 . In the present embodiment, one end of the rotating shaft 13 is connected to a hub 15. Alternatively, in another embodiment, one end of the rotating shaft 13 can be connected to an impeller (not shown).

The present invention controls the support length X of the support portion 124 to be in the range of L/15≦X≦2L/3, thereby ensuring that the support area provided by the support portion 124 is sufficient to maintain the stability of the rotary shaft 13, and At the same time, the friction area of the rotating shaft 13 and the supporting portion 124 is reduced and noise is prevented, thereby preventing the friction problem from affecting the stability when the rotating shaft rotates.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the scope of the present invention. The scope of the invention should be as set forth in the appended claims.

12A‧‧‧oil bearing

120a‧‧‧ first end face

120b‧‧‧second end face

121‧‧‧Axis hole

122‧‧‧First contraction

122a‧‧‧first opening

122b‧‧‧second opening

123‧‧‧Second gradual

123a‧‧‧ third opening

123b‧‧‧fourth opening

124‧‧‧Support

D1‧‧‧Diameter of the first opening

D2‧‧‧ diameter of the second opening

D3‧‧‧Diameter of the third opening

D4‧‧‧ diameter of the fourth opening

HD‧‧‧Aperture of the support

L‧‧‧ axial length

X‧‧‧Support length

Claims (16)

A motor includes: a base having a shaft tube; a motor bearing structure disposed in the shaft tube of the base, the motor bearing structure including at least two bearings, the at least two bearings including at least one oil bearing, the at least one oil bearing The utility model has a shaft hole and an axial length L. The shaft hole includes at least one tapered portion and a supporting portion. The supporting portion communicates with the tapered portion. The supporting portion has a supporting length X, and the supporting length X satisfies the relationship: L/15≦X≦2L/3; a rotating shaft is disposed through the shaft hole of the at least one oil bearing, the supporting portion of the shaft hole supports the rotating shaft; and the stator is disposed outside the shaft tube of the base. The motor of claim 1, wherein the shaft hole comprises a first tapered portion and a second tapered portion, the second tapered portion is located relative to the first tapered portion, the supporting portion is located at the first tapered portion Between the portion and the second tapered portion. The motor of claim 2, wherein the at least one oil bearing further has a first end surface and a second end surface, the shaft hole communicating with the first end surface and the second end surface, the aperture of the first tapered portion is from the The first end surface is tapered toward the support portion, and the aperture of the second tapered portion is tapered from the second end surface toward the support portion. The motor of claim 3, wherein the first tapered portion has a first opening and a second opening, the first opening communicates with the first end surface, the second opening communicates with the supporting portion, and the diameter of the second opening It is equal to the aperture of the support. The motor of claim 4, The second tapered portion has a third opening and a fourth opening. The third opening communicates with the second end surface. The fourth opening communicates with the supporting portion. The diameter of the fourth opening is equal to the diameter of the supporting portion. The motor of claim 5, wherein the diameter of the third opening of the second tapered portion is equal to the diameter of the first opening of the first tapered portion. The motor of claim 1, wherein the support has a single aperture. The motor of claim 1, wherein the at least one oil bearing has an axial length L of 1 to 6 mm. A motor bearing structure comprising at least two bearings, the at least two bearings comprising at least one oil bearing, the at least one oil bearing has a shaft hole and an axial length L, the shaft hole comprising at least one tapered portion and a supporting portion, The support portion communicates with the tapered portion, and the support portion has a support length X that satisfies the relationship: L/15≦X≦2L/3. The motor bearing structure of claim 9, wherein the shaft hole comprises a first tapered portion and a second tapered portion, the second tapered portion is opposite to the first tapered portion, the supporting portion is located at the first portion Between the tapered portion and the second tapered portion. The motor bearing structure of claim 10, wherein the at least one oil bearing further has a first end surface and a second end surface, the shaft hole communicating with the first end surface and the second end surface, and the aperture of the first tapered portion The first end surface is tapered toward the support portion, and the aperture of the second tapered portion is tapered from the second end surface toward the support portion. The motor bearing structure of claim 11, wherein the first tapered portion has a first opening and a second opening, the first opening The port communicates with the first end surface, and the second opening communicates with the support portion, and the diameter of the second opening is equal to the aperture of the support portion. The motor bearing structure of claim 12, wherein the second tapered portion has a third opening and a fourth opening, the third opening communicates with the second end surface, the fourth opening communicates with the supporting portion, the fourth opening The diameter is equal to the aperture of the support. The motor bearing structure of claim 13, wherein the diameter of the third opening of the second tapered portion is equal to the diameter of the first opening of the first tapered portion. The motor bearing structure of claim 9, wherein the support has a single aperture. The motor bearing structure of claim 9, wherein the at least one oil bearing has an axial length L of 1 to 6 mm.