TWI599150B - Motor and dynamic pressure plate thereof - Google Patents

Description

Motor and its dynamic pressure plate

The present invention relates to a motor, and more particularly to a motor provided with a dynamic pressure plate.

Referring to FIG. 1, a conventional motor 9 includes a sleeve 91 and a shaft 92. The shaft 92 extends into the sleeve 91, and a radial bearing portion is formed between the shaft 92 and the sleeve 91. Thereby, the shaft 92 can be formed to be rotatably coupled to the sleeve 91 such that the shaft 92 can be pivoted relative to the sleeve 91 when driven. An embodiment similar to the conventional motor 9 is disclosed in the patent publication "Spindle Motor and Assembly Method" of Chinese Patent No. 1249887.

One side of the sleeve 91 is provided with an axial thrust plate 911. One end of the shaft 92 is coupled to a thrust plate 921. The axial thrust plate 911 and the thrust plate 921 constitute the shaft 92 in the axial direction. Axial thrust bearing. In detail, a lubricating fluid such as oil may be filled between the axial thrust plate 911 and the thrust plate 921 to maintain a distance between the axial thrust plate 911 and the thrust plate 921 to reduce the friction of the shaft 92. Torque. However, the surface of the axial thrust plate 911 opposite to the thrust plate 921 is flat. When the shaft 92 is subjected to pressure or generates vibration during rotation, the axial thrust plate 911 and the thrust plate 921 are The thickness of the lubricating fluid layer between the two will be thinned, even in the case where the axial thrust plate 911 is in direct contact with the thrust plate 921. Accordingly, the frictional torque reduction of the shaft 92 is limited.

In view of this, the conventional motor 9 has a problem that the shaft 92 cannot be smoothly rotated, and there is still a need for improvement.

In order to solve the above problems, the present invention provides a motor and a dynamic pressure plate thereof. The surface of the dynamic pressure plate is provided with a plurality of dynamic pressure grooves to increase the effective thickness and supporting force of the lubricating fluid layer between the dynamic pressure plate and a thrust plate.

In order to achieve the foregoing object, the technical means used in the present invention comprises: a motor comprising: a base, a bearing sleeve, a bearing is disposed inside the bearing sleeve; and a rotor comprising a rotating shaft and a stop a push plate, the rotating shaft is coupled to the bearing, the thrust plate is disposed at one end of the rotating shaft; and a movable pressing plate is disposed on one side of the bearing sleeve, and the dynamic pressing plate faces the thrust plate, the thrust The plate is located between the bearing and the dynamic pressure plate. The dynamic pressure plate is provided with a plurality of dynamic pressure grooves on a surface of the thrust plate. The movable plate has a hole in the center thereof, and the dynamic pressure plate includes a surface facing the surface of the thrust plate. An inner contour and an outer contour, the inner contour covering the hole, the outer contour covering the inner contour, and the outer contour having a distance from an outer circumference of the dynamic pressure plate, the inner contour forming an area with the outer contour Each of the dynamic pressure grooves is disposed in the region; wherein the thrust plate has an outer circumference facing a bottom surface of the dynamic pressure plate, the outer circumference covering the outer contour in an axial direction of the rotation shaft.

A motor comprising: a base, a bearing sleeve, a bearing is disposed inside the bearing sleeve; a rotor comprising a rotating shaft and a thrust plate, the rotating shaft is coupled to the bearing, and the thrust plate is disposed on the bearing One end of the rotating shaft; and a movable pressing plate disposed on one side of the bearing sleeve, and the dynamic pressing plate faces the thrust plate, the thrust plate is located between the bearing and the dynamic pressure plate, and the dynamic pressure plate faces the The surface of one of the thrust plates is provided with a plurality of dynamic pressure grooves, and the center of the dynamic pressure plate is provided with a hole groove, and the surface of the dynamic pressure plate includes an inner contour and an outer contour facing the surface of the thrust plate, the inner contour covering the hole groove, The outer contour covers the inner contour, and the outer contour has a distance from the outer circumference of the dynamic pressure plate, and the inner contour and the outer contour form an area, and the dynamic pressure grooves are disposed in the area; The push plate has an inner periphery facing a bottom surface of the dynamic pressure plate, and the inner contour covers the inner circumference in an axial direction of the rotating shaft.

A motor comprising: a base having a bearing sleeve, the inside of the bearing sleeve a rotor is provided, the rotor includes a rotating shaft and a thrust plate, the rotating shaft is coupled to the bearing, the thrust plate is disposed at one end of the rotating shaft, and a movable pressing plate is disposed on the bearing sleeve a side of the movable plate facing the thrust plate, the thrust plate being located between the bearing and the dynamic pressure plate, wherein the dynamic pressure plate is provided with a plurality of dynamic pressure grooves on a surface of the thrust plate, and a center of the dynamic pressure plate is provided a hole groove, the dynamic pressure plate having an inner contour and an outer contour facing the surface of the thrust plate, the inner contour covering the hole, the outer contour covering the inner contour, and the outer contour and the outer circumference of the dynamic pressure plate have a spacing between the inner contour and the outer contour, wherein each dynamic pressure groove is disposed in the region; wherein each of the dynamic pressure grooves has two side edges, each of the dynamic pressure grooves including a first end portion And a second end portion, the two side edges are respectively connected to the first end portion and the second end portion, the first end portion is located at the inner contour, the second end portion is located at the outer contour, and the surface comprises a boundary The contour of the contour is a circle centered on the center of the dynamic plate The boundary contour is located between the inner contour and the outer contour, and the inner contour and the boundary contour form a first region, and the boundary contour and the outer contour form a second region, and the slot is formed Centering, at least one side edge of each of the dynamic pressure grooves forms an equiangular spiral in the section in the first area, and the section of the at least one side edge in the second area forms an involute line .

A motor comprising: a base, a bearing sleeve, a bearing is disposed inside the bearing sleeve; a rotor comprising a rotating shaft and a thrust plate, the rotating shaft is coupled to the bearing, and the thrust plate is disposed on the bearing One end of the rotating shaft; and a movable pressing plate disposed on one side of the bearing sleeve, and the dynamic pressing plate faces the thrust plate, the thrust plate is located between the bearing and the dynamic pressure plate, and the dynamic pressure plate faces the One surface of the thrust plate is provided with a plurality of dynamic pressure grooves; wherein the dynamic pressure plate comprises a plate and a seat body coupled to each other, and the surface of the dynamic pressure plate facing the thrust plate is located on the plate, and the hardness of the seat body is greater than The hardness of the sheet.

Wherein, the center of the dynamic pressure plate is provided with a hole groove. Thereby, an accommodating space for accommodating the lubricating fluid is formed between the dynamic pressure plate and the bearing, and the hole communicates with the accommodating space, so that the hole can serve as a lubricating fluid storage tank.

Wherein, the rotating shaft is provided with one end of the thrust plate adjacent to the hole. Thereby, the lubricating fluid accommodated in the accommodating space can lubricate the one end of the rotating shaft in addition to lubricating the thrust plate.

Wherein, the dynamic pressure plate comprises an inner contour and an outer contour toward the surface of the thrust plate, the inner contour covering the hole, the outer contour covering the inner contour, and the outer contour and the outer circumference of the dynamic pressure plate have a The spacing, the inner contour and the outer contour form an area, and each of the dynamic pressure grooves is disposed in the area. Thereby, each of the dynamic pressure grooves does not communicate with the hole or the outer circumference of the dynamic pressure plate.

Wherein the thrust plate has an outer circumference facing a bottom surface of the dynamic pressure plate, the outer circumference covering the outer contour in the axial direction of the rotating shaft, so that the dynamic pressure grooves do not extend outward in the radial direction of the rotating shaft Beyond the thrust plate.

Wherein the thrust plate has an inner circumference facing a bottom surface of the dynamic pressure plate, the inner contour covering the inner circumference in the axial direction of the rotating shaft, so that the dynamic pressure grooves do not extend inwardly along the radial direction of the rotating shaft Beyond the thrust plate.

Each of the dynamic pressure grooves has two side edges, and a portion or all of at least one side edge of each of the dynamic pressure grooves is formed with a spiral line, and the spiral line is equiangular. Spiral. By forming the spiral line at least one side edge of each of the dynamic pressure grooves, it is possible to effectively reduce the friction torque when the rotating shaft rotates.

Each of the dynamic pressure grooves has two side edges, and each of the dynamic pressure grooves includes a first end portion and a second end portion, and the two side edges respectively connect the first end portion and the second end portion. One end is located in the inner contour and the second end is located in the outer contour. Thereby, each of the dynamic pressure grooves extends from the inner contour to the outer contour.

Wherein a partial section or all of at least one side edge of each of the dynamic pressure grooves forms an involute line extending from the first end portion toward the second end portion. By forming the involute line on at least one side edge of each of the dynamic pressure grooves, it is possible to effectively reduce the friction torque when the rotation shaft rotates.

Wherein, the distance between the two side edges is gradually increased from the first end portion toward the second end portion, so that the width of each of the dynamic pressure grooves can be gradually increased outward along the radial direction of the rotating shaft, so that the dynamic pressure plate and the The layer of lubricating fluid between the thrust plates is evenly stressed.

The inner contour and the outer contour are respectively circular shapes centered on the center of the dynamic pressure plate. Thereby, the first end portion and the second end portion of each of the dynamic pressure grooves are respectively located on an inner contour and an outer contour forming a concentric circle.

Wherein the surface comprises a boundary contour, the boundary contour is a circle centered on the center of the dynamic pressure plate, the boundary contour is located between the inner contour and the outer contour, and the inner contour and the boundary contour form a first a region, the boundary contour and the outer contour form a second region, and the at least one edge of each of the dynamic pressure grooves forms an equiangular snail in the segment in the first region a line, the section of the at least one edge in the second region forming an involute. By forming the above-described shape on at least one side edge of each of the dynamic pressure grooves, it is possible to effectively reduce the friction torque when the rotation shaft rotates.

Wherein, the inner contour has a first radius r _i with respect to the center of the dynamic pressure plate, and the outer contour has a second radius r _o with respect to the center of the dynamic pressure plate, and the boundary contour is opposite to a third radius r _{m of the} center of the dynamic pressure plate It is expressed as follows: r _m =r _i +(r _o -r _i )/K where 1<K<1.5, thereby ensuring that the range of the first region is sufficiently large to allow at least one side of each of the dynamic pressure grooves The section forming the equiangular spiral of the rim is sufficiently long to properly distribute the ratio of the section of the at least one edge forming the equiangular spiral to the section forming the involute line to enhance the effect of reducing the frictional torque of the shaft.

Wherein the angle of the isosceles spiral is 25°~35°, and the angle of tangent of the involute line at the end of the outer contour is 11°~13°, thereby reducing the friction torque of the rotating shaft More significant.

Wherein, the number of the plurality of dynamic pressure grooves is 12 to 20, and preferably 16, Therefore, the effect of reducing the friction torque of the rotating shaft is remarkable.

The depth of each of the dynamic pressure grooves in the axial direction of the rotating shaft is 20 to 30 μm, and preferably 24 to 26 μm, so that the effect of reducing the friction torque of the rotating shaft is remarkable.

The bearing sleeve may be internally provided with a positioning member coupled to the inner peripheral wall of the bearing sleeve, and the positioning member abuts the bearing to support the bearing, thereby positioning the bearing on the bearing sleeve.

Wherein one side of the thrust plate is spaced from the surface of the dynamic pressure plate, and the other side of the thrust plate is spaced from the bearing or the positioning member, so that the rotating shaft can be freely pivoted without hindrance .

Wherein, the thrust plate and the rotating shaft are combined by laser welding to improve the bonding strength between the rotating shaft and the thrust plate.

The dynamic pressure plate comprises a plate and a seat body combined with each other, and the surface of the dynamic pressure plate facing the thrust plate is located on the plate, and the hardness of the seat body is greater than the hardness of the plate. Therefore, by opening the plurality of dynamic pressure grooves on the sheet having a small hardness, the processing difficulty of the plurality of dynamic pressure grooves can be reduced, and the seat body having a large hardness can still maintain sufficient rigidity of the dynamic pressure plate.

Wherein, the surface of the plate is etched or electroformed to form the plurality of dynamic pressure grooves. Thereby, the processing difficulty of the plurality of dynamic pressure grooves can be effectively reduced, and the forming precision of the dynamic pressure groove is improved.

The dynamic pressure plate is disposed on a bottom cover, and a sealing ring is disposed between the dynamic pressure plate and the bottom cover; the sealing ring can be made of rubber or silicone. Thereby, the lubricating fluid in the accommodating space can be prevented from leaking between the dynamic pressure plate and the bottom cover.

A dynamic pressure plate for a motor, comprising: a plate having a surface of one of the plurality of dynamic pressure grooves formed by etching or electroforming; and a body having a hardness greater than a hardness of the plate, The sheet is bonded to the seat body on one side of the surface. Thereby, the dynamic pressure plate can achieve the effect of reducing the processing difficulty of the plurality of dynamic pressure grooves and maintaining the rigidity of the dynamic pressure plate.

Wherein, the center of the plate is provided with a hole groove. Thereby, since the hardness of the plate is small, the processing difficulty of the hole groove can be effectively reduced.

Wherein, the plate is a flexible circuit board. Thereby, the surface of the sheet can be formed by etching or electroforming.

The seat body is a plate made of metal material. Therefore, the hardness of the seat body will be much larger than the hardness of the plate, so that the seat body can effectively maintain the rigidity of the dynamic pressure plate.

The number of the dynamic pressure grooves is 12-20, and preferably 16, so that the effect of reducing the friction torque of one shaft is remarkable.

The dynamic pressure groove has a depth in the axial direction of 20 to 30 μm, and preferably 24 to 26 μm. The axial direction is perpendicular to the surface, so that the effect of reducing the friction torque of a rotating shaft is remarkable.

According to the above configuration, the motor of the embodiment of the present invention and the dynamic pressure plate thereof are provided with a plurality of dynamic pressure grooves on the surface of the dynamic pressure plate, so that lubricating fluid is filled in each of the dynamic pressure grooves, and the dynamic pressure plate can be increased. The effective thickness and supporting force of the lubricating fluid layer between the push plates has the effect of reducing the friction torque of the rotating shaft.

〔this invention〕

1‧‧‧Base

11‧‧‧ bearing sleeve

111‧‧‧ openings

112‧‧‧ bottom cover

12‧‧‧ bearing

13‧‧‧ Positioning parts

14‧‧‧Seal ring

2‧‧‧Rotor

21‧‧‧ shaft

22‧‧‧ push plate

221‧‧‧ outer periphery

222‧‧‧ inner circumference

3‧‧‧dynamic plate

3a‧‧‧ plates

3b‧‧‧ body

31‧‧‧ surface

32‧‧‧ dynamic pressure ditch

321‧‧‧ side edge

322‧‧‧ first end

323‧‧‧second end

33‧‧‧ hole slot

34‧‧‧ outer periphery

341‧‧‧ recess

35‧‧‧ Groove

S‧‧‧ accommodating space

C1‧‧‧ inside contour

C2‧‧‧Outer contour

C3‧‧‧ boundary contour

R‧‧‧ area

R1‧‧‧ first area

R2‧‧‧ second area

θ 1‧‧‧ angle

θ 2‧‧‧ angle

[study]

9‧‧‧Motor

91‧‧‧Sleeve

911‧‧‧ axial thrust plate

92‧‧‧Axis

921‧‧‧ push plate

Figure 1: A cross-sectional view of a conventional motor.

Fig. 2 is a cross-sectional view showing the combined structure of the first embodiment of the present invention.

Fig. 3 is a perspective view showing the appearance of a movable platen according to a first embodiment of the present invention.

Fig. 4 is a top plan view showing a movable platen according to a first embodiment of the present invention.

Fig. 5 is a graph showing the relationship between the tangential angle of the section of the dynamic pressure groove forming the involute line of the first embodiment of the present invention at the end point of the outer contour and the frictional torque of the rotating shaft.

Fig. 6 is a graph showing the relationship between the number of dynamic pressure grooves and the friction torque of the rotating shaft in the first embodiment of the present invention.

Fig. 7 is a graph showing the relationship between the dynamic pressure groove depth and the friction torque of the rotating shaft in the first embodiment of the present invention.

Fig. 8 is a cross-sectional view showing the combined structure of the positioning member of the base of the embodiment of the present invention placed outside the bearing.

Fig. 9 is a schematic exploded view showing the structure of a movable platen according to a first embodiment of the present invention.

Figure 10 is a cross-sectional view showing the combined structure of the second embodiment of the present invention.

Figure 11 is a schematic exploded view showing the structure of a movable platen according to a second embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; A motor according to a first embodiment of the present invention comprises a base 1, a rotor 2 and a movable platen 3. The rotor 2 is rotatably coupled to the base 1 , and the dynamic pressure plate 3 is disposed on the base 1 .

The base 1 includes a bearing sleeve 11 , and the outer circumference of the bearing sleeve 11 can be combined with a member such as a housing, a core or a circuit board. The bearing sleeve 11 is provided with an opening 111. A bearing 12 is disposed inside the bearing sleeve 11. In this embodiment, the bearing 12 can be a dynamic pressure bearing. However, the bearing 12 can also be a bearing of other types (for example, a copper bearing). The invention is not limited thereto. The locating member 13 can be a ring body or a plurality of blocks. The locating member 13 can be coupled to the inner peripheral wall of the bearing sleeve 11 and the positioning member 13 abuts. The bearing 12 is for supporting the bearing 12, and the bearing 12 is positioned on the bearing sleeve 11. However, the bearing 12 can also be positioned on the bearing sleeve 11 via a tight fit or integral with the bearing sleeve 11 , so the invention is not limited thereto.

The rotor 2 includes a rotating shaft 21 and a thrust plate 22. The rotating shaft 21 can be inserted into the bearing sleeve 11 from the opening 111, and the rotating shaft 21 is coupled to the bearing 12 to rotate the rotating shaft 21 relative to the bearing sleeve 11. Therefore, the rotor 2 is formed to be rotatably coupled to the base 1. The thrust plate 22 is disposed at one end of the rotating shaft 21. The rotating shaft 21 and the thrust plate 22 can be made of a metal material, so that the rotating shaft 21 and the thrust plate 22 can be combined by laser welding to enhance the bonding strength between the rotating shaft 21 and the thrust plate 22.

The dynamic pressure plate 3 is disposed on a side of the bearing sleeve 11 away from the opening 111. An accommodating space S is formed between the dynamic pressure plate 3 and the bearing 12. The thrust plate 22 of the rotor 2 is disposed in the accommodating space. In S, the thrust plate 22 is formed between the bearing 12 and the dynamic pressure plate 3, and the dynamic pressure plate 3 faces the thrust plate 22 of the rotor 2. The dynamic pressure plate 3 is provided with a plurality of dynamic pressure grooves 32 toward one surface 31 of the thrust plate 22.

With the above structure, when the motor of the first embodiment of the present invention is actually used, the accommodating space S between the dynamic pressure plate 3 and the bearing 12 can accommodate a lubricating fluid (for example, oil), so that the dynamic pressure plate 3 and A lubricating fluid layer (for example, an oil film) can be formed between the thrust plates 22, so that the dynamic pressure plate 3 and the thrust plate 22 can be kept at a distance to reduce the friction torque of the rotating shaft 21. Since the surface 31 of the dynamic pressure plate 3 is provided with a plurality of dynamic pressure grooves 32, the lubricating fluid will be filled in each of the dynamic pressure grooves 32 to increase the effective thickness and supporting force of the lubricating fluid layer. Therefore, when the rotating shaft 21 is subjected to pressure or generates vibration during the rotation, the lubricating fluid layer can be effectively prevented from being thinned to prevent the dynamic pressure plate 3 from directly contacting the thrust plate 22, so the first The motor of the embodiment can further reduce the friction torque of the rotating shaft 21.

According to the foregoing structure, the characteristics of the motor of each embodiment of the present invention are described in detail below and explained one by one. Referring to Figures 2 and 3, the center of the dynamic pressure plate 3 is provided with a hole 33, and the hole 33 communicates with the accommodating space. S, the hole 33 can be used as a lubricating fluid storage tank. The rotating shaft 21 is provided with one end of the thrust plate 22 adjacent to the hole 33, whereby the lubricating fluid accommodated in the accommodating space S can lubricate the thrust plate 22 at the same time. One end of the rotating shaft 21.

Referring to Figures 3 and 4, the surface 31 includes an inner contour C1 and an outer surface. a contour C2, the inner contour C1 covering the hole 33, the outer contour C2 covering the inner contour C1, and the outer contour C2 having a distance from the outer circumference of the dynamic pressure plate 3, the inner contour C1 and the outer contour C2 A region R is formed, and each of the dynamic pressure grooves 32 is disposed in the region R. Thereby, each of the dynamic pressure grooves 32 does not communicate with the hole 33 or the outer circumference of the dynamic pressure plate 3. Referring to FIG. 2 together, the thrust plate 22 has an outer peripheral edge 221 and an inner peripheral edge 222 facing a bottom surface of the dynamic pressure plate 3, and the outer peripheral edge 221 can cover the axial direction of the rotating shaft 21 The outer contour C2 is such that each of the dynamic pressure grooves 32 does not extend outward in the radial direction of the rotating shaft 21 beyond the thrust plate 22; in contrast, the inner contour C1 may cover the inner circumference 222 in the axial direction of the rotating shaft 21 Therefore, each of the dynamic pressure grooves 32 does not extend inward in the radial direction of the rotating shaft 21 beyond the thrust plate 22. In other words, each of the dynamic pressure grooves 32 can be located in the axial direction of the rotating shaft 21 within the range of the thrust plate 22, so that the plurality of dynamic pressure grooves 32 can surely avoid the between the dynamic pressure plate 3 and the thrust plate 22. The lubricating fluid layer is thinned to prevent direct contact of the dynamic pressure plate 3 with the thrust plate 22.

Referring to FIGS. 3 and 4, each of the dynamic pressure grooves 32 has two side edges 321 and a portion or all of the at least one side edge 321 of each of the dynamic pressure grooves 32 is centered on the hole 33. Form a spiral or a gradually extending line. In detail, each of the dynamic pressure grooves 32 includes a first end portion 322 and a second end portion 323. The two side edges 321 are respectively connected to the first end portion 322 and the second end portion 323. The portion 322 is located at the inner contour C1, and the second end portion 323 is located at the outer contour C2 such that each of the dynamic pressure grooves 32 extends from the inner contour C1 to the outer contour C2. In the embodiment, the inner contour C1 and the outer contour C2 are respectively circular with the center of the dynamic pressure plate 3 as a center. Therefore, the first end portion 322 and the second end portion 323 of each of the dynamic pressure grooves 32 are respectively Located on the inner contour C1 and the outer contour C2 forming concentric circles. A partial section or all of at least one side edge 321 of each of the dynamic pressure grooves 32 forms an equiangular spiral centered on the hole 33; or is formed by the first end portion 322 toward the second end portion 323 Stretch one of the lines. In addition, the distance between the two side edges 321 can be gradually increased from the first end portion 322 toward the second end portion 323, so that the lubricating fluid layer between the dynamic pressure plate 3 and the thrust plate 22 can be uniformly stressed.

In this embodiment, the surface 31 includes a boundary contour C3, which is also a circle centered on the center of the dynamic pressure plate 3, and the boundary contour C3 is located between the inner contour C1 and the outer contour C2. The boundary contour C3 divides the region R between the inner contour C1 and the outer contour C2 into a first region R1 and a second region R2. The first region R1 is formed between the inner contour C1 and the boundary contour C3, and the second region R2 is formed between the boundary contour C3 and the outer contour C2, and the dynamic pressure groove is centered on the hole 33 The section of at least one side edge 321 of the 32 in the first region R1 forms an equiangular spiral, and the section of the at least one edge 321 in the second region R2 forms an involute. In other words, a section of at least one edge 321 of each of the dynamic pressure grooves 32 forms an equiangular spiral centered on the hole 33, and another section is formed by the first end 322. The second end portion 323 is gradually extended by one of the involute lines. By forming at least one side edge 321 of each of the dynamic pressure grooves 32 in the above-described shape, it is possible to effectively reduce the friction torque when the rotary shaft 21 rotates.

More specifically, referring to FIG. 3, the inner contour C1 has a first radius r _i with respect to the center of the dynamic pressure plate 3, and the outer contour C2 has a second radius r _o with respect to the center of the dynamic pressure plate 3, The third radius r _{m of the} boundary contour C3 with respect to the center of the dynamic pressure plate 3 can be expressed by the following formula (1): r _m = r _i + (r _{o -} r _i ) / K (1)

Among them, 1 < K < 1.5.

By conforming the third radius r _{m of} the boundary contour C3 to the above formula (1), it is ensured that the range of the first region R1 is sufficiently large, so that at least one edge 321 of each of the dynamic pressure grooves 32 forms an equiangular spiral. The section is sufficiently long to properly distribute the ratio of the section of the at least one edge 321 forming the equiangular spiral to the section forming the involute line to enhance the effect of reducing the frictional torque of the shaft 21.

The shape of the equiangular spiral and the involute line is affected, in addition to the ratio of the section of the equipotential spiral forming the at least one edge 321 of each of the dynamic pressure grooves 32 to the section forming the involute line. The plurality of dynamic pressure grooves 32 reduce the effect of the friction torque of the rotating shaft 21. Please refer to section 5 together. As shown in the figure, the tangential angle θ 2 of the extension line at the end point of the outer contour C2 is 11° to 13°, and the angle θ 1 of the isosceles spiral is set to 25° to 35°, which is lowered. The effect of the friction torque of the shaft 21 is most remarkable.

In addition, the number and depth of the plurality of dynamic pressure grooves 32 directly affect the thickness of the lubricating fluid layer between the dynamic pressure plate 3 and the thrust plate 22, and thus also affect the plurality of dynamic pressure grooves 32 to lower the rotating shaft. 21 friction torque effect. Referring to Fig. 6, when the number of the plurality of dynamic pressure grooves 32 is 16, the effect of reducing the friction torque of the rotating shaft 21 is most remarkable. Accordingly, the number of the plurality of dynamic pressure grooves 32 is preferably 12 to 20, and more preferably 16. On the other hand, referring to Fig. 7, when the depth of each of the dynamic pressure grooves 32 is 24 to 26 μm, the effect of reducing the friction torque of the rotating shaft 21 is most remarkable. Accordingly, the depth of each of the dynamic pressure grooves 32 is preferably 20 to 30 μm, and more preferably 24 to 26 μm.

As shown in FIG. 2, in the embodiment, the positioning member 13 is disposed between the bearing 12 and the thrust plate 22 in the axial direction of the rotating shaft 21, and therefore, the thrust plate 22 is respectively disposed on the two sides. The positioning member 13 and the surface 31 of the dynamic pressure plate 3 are faced. For example, in the embodiment of the present invention, the positioning member 13 can be disposed outside the bearing 12 in the radial direction of the rotating shaft 21, so that one side of the thrust plate 22 can face the same at the same time. The bearing 12 and the positioning member 13 are not limited thereto. Wherein, the accommodating space S between the dynamic pressure plate 3 and the bearing 12 can accommodate the lubricating fluid, so that one side of the thrust plate 22 can maintain a distance from the surface 31 of the dynamic pressure plate 3, the thrust The other side of the plate 22 is spaced from the bearing 12 or the positioning member 13 so that the shaft 21 can be freely pivoted without hindrance.

As shown in FIG. 2 , in the embodiment, a cover 112 is disposed on a side of the bearing sleeve 11 away from the opening 111 , and the bottom cover 112 closes a side of the bearing sleeve 11 away from the opening 111 , so that It forms a closed. The dynamic pressure plate 3 may be disposed on the bottom cover 112 such that it is formed on a side of the bearing sleeve 11 away from the opening 111.

It is worth noting that the thickness of the dynamic pressure plate 3 in the axial direction of the rotating shaft 21 is relatively Preferably, the thickness of the bottom cover 112 is smaller than that, so that the overall axial height of the motor of the first embodiment is not easily affected by the provision of the dynamic pressure plate 3. However, the dynamic pressure plate 3 must be provided with a plurality of dynamic pressure grooves 32. If the thickness of the dynamic pressure plate 3 is to be reduced, it may be difficult to form the plurality of dynamic pressure grooves 32 on the surface 31 of the dynamic pressure plate 3. To this end, as shown in FIG. 9, in the present embodiment, the dynamic pressure plate 3 includes a plate 3a and a seat 3b which are coupled to each other. The surface of the dynamic plate 3 facing the thrust plate 22 is located on the plate. In the sheet 3a, the hardness of the seat 3b is greater than the hardness of the sheet 3a. Therefore, by opening the plurality of dynamic pressure grooves 32 on the sheet 3a having a small hardness, the processing difficulty of the plurality of dynamic pressure grooves 32 can be reduced, but the sheet 3a is bonded to the seat having a higher hardness. 3b, so the dynamic pressure plate 3 can still maintain sufficient rigidity. Furthermore, the center of the plate 3a can be formed with a uniform hole or a blind hole connecting the surface 31 as the hole 33. Since the hardness of the plate 3a is small, the processing difficulty of the hole 33 can be effectively reduced. .

In detail, the plate 3a of the dynamic pressure plate 3 can be a flexible circuit board. Therefore, the surface 31 of the plate 3a can be formed by etching (for example, chemical etching or laser etching) or electroforming. Dynamic pressure groove 32. For example, the plate 3a may be a flexible circuit board, and the surface of the flexible circuit board may be provided with copper foil, so that the plurality of dynamic pressure grooves 32 may be formed by etching the copper foil. Thereby, the processing difficulty of the plurality of dynamic pressure grooves 32 can be effectively reduced, and the etching or electroforming process can easily control the width and depth of each of the dynamic pressure grooves 32 to improve the forming of the dynamic pressure groove 32. Accuracy. The seat body 3b may be a plate body made of a metal material (for example, a stainless steel plate or an aluminum plate), whereby the hardness of the seat body 3b will be much larger than the hardness of the plate piece 3a, so that the seat body 3b can effectively maintain the plate body 3b. The rigidity of the movable platen 3. The seat body 3b can be provided with a recess 35 for receiving the panel 3a, thereby enhancing the bonding strength of the panel 3a and the base 3b. For the motor of the second embodiment of the present invention, the seat 3b does not need to be recessed, and the plate 3a can be fixed to the base by welding or bonding. 3b, the invention is not limited thereto.

Furthermore, the seat body 3b includes an outer peripheral edge 34, and the outer peripheral edge 34 can To abut the inner peripheral wall of the bearing sleeve 11, the seat body 3b is provided with a recess 341 on the outer circumference, and the recess 341 can be inserted into the accommodating space S during the assembly process of the dynamic pressure plate 3 to facilitate injection lubrication. fluid. In addition, the recess 341 can also be coupled to the bearing sleeve 11 to fix the position of the dynamic pressure plate 3, thereby preventing the dynamic pressure plate 3 from rotating relative to the bearing sleeve 11.

In addition, in the second embodiment, the base 1 may be further provided with a sealing ring 14 between the dynamic pressure plate 3 and the bottom cover 112. The sealing ring 14 may be made of a material having good elasticity such as rubber or silicone. The sealing ring 14 can increase the adhesion between the dynamic pressure plate 3 and the bottom cover 112 to prevent the lubricating fluid in the accommodating space S from leaking between the dynamic pressure plate 3 and the bottom cover 112.

In summary, the motor of the embodiment of the present invention and the dynamic pressure plate 3 thereof are provided with a plurality of dynamic pressure grooves 32 on the surface 31 of the dynamic pressure plate 3, so that lubricating fluid is filled in each of the dynamic pressure grooves 32, which can be increased. The effective thickness and supporting force of the lubricating fluid layer between the movable platen 3 and the thrust plate 22. Accordingly, the thickness of the lubricating fluid layer between the axial thrust plate 911 and the thrust plate 921 will be thinner or even thinner than when the shaft 92 of the conventional motor 9 is subjected to pressure or generates vibration during the rotation. The axial thrust plate 911 is in direct contact with the thrust plate 921. The motor of each embodiment of the present invention can effectively prevent the lubricating fluid layer from being thinned to prevent the dynamic pressure plate 3 from directly contacting the thrust plate 22, and has the effect of reducing the friction torque of the rotating shaft 21.

Furthermore, the dynamic pressure plate of the motor of each embodiment of the present invention may include a plate 3a and a seat 3b having a hardness greater than that of the plate 3a. The surface 31 of the plate 3a may be formed by etching or electroforming. The dynamic pressure groove 32 is configured to reduce the processing difficulty of the plurality of dynamic pressure grooves 32 and maintain the rigidity of the dynamic pressure plate 3.

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.

1‧‧‧Base

11‧‧‧ bearing sleeve

111‧‧‧ openings

112‧‧‧ bottom cover

12‧‧‧ bearing

13‧‧‧ Positioning parts

2‧‧‧Rotor

21‧‧‧ shaft

22‧‧‧ push plate

221‧‧‧ outer periphery

222‧‧‧ inner circumference

3‧‧‧dynamic plate

31‧‧‧ surface

32‧‧‧ dynamic pressure ditch

33‧‧‧ hole slot

S‧‧‧ accommodating space

Claims (37)

A motor comprising: a base, a bearing sleeve, a bearing is disposed inside the bearing sleeve; a rotor comprising a rotating shaft and a thrust plate, the rotating shaft is coupled to the bearing, and the thrust plate is disposed on the bearing One end of the rotating shaft; and a movable pressing plate disposed on one side of the bearing sleeve, and the dynamic pressing plate faces the thrust plate, the thrust plate is located between the bearing and the dynamic pressure plate, and the dynamic pressure plate faces the The surface of one of the thrust plates is provided with a plurality of dynamic pressure grooves, and the center of the dynamic pressure plate is provided with a hole groove, and the surface of the dynamic pressure plate includes an inner contour and an outer contour facing the surface of the thrust plate, the inner contour covering the hole groove, The outer contour covers the inner contour, and the outer contour has a distance from the outer circumference of the dynamic pressure plate, and the inner contour and the outer contour form an area, and the dynamic pressure grooves are disposed in the area; The push plate has an outer periphery facing a bottom surface of the dynamic pressure plate, the outer circumference covering the outer contour in the axial direction of the rotating shaft. A motor comprising: a base, a bearing sleeve, a bearing is disposed inside the bearing sleeve; a rotor comprising a rotating shaft and a thrust plate, the rotating shaft is coupled to the bearing, and the thrust plate is disposed on the bearing One end of the rotating shaft; and a movable pressing plate disposed on one side of the bearing sleeve, and the dynamic pressing plate faces the thrust plate, the thrust plate is located between the bearing and the dynamic pressure plate, and the dynamic pressure plate faces the The surface of one of the thrust plates is provided with a plurality of dynamic pressure grooves, and the center of the dynamic pressure plate is provided with a hole groove, and the surface of the dynamic pressure plate includes an inner contour and an outer contour facing the surface of the thrust plate, the inner contour covering the hole groove, The outer contour covers the inner contour, and the outer contour has a distance from the outer circumference of the dynamic pressure plate, and the inner contour and the outer contour form an area, and the dynamic pressure grooves are disposed in the area; The push plate has an inner periphery facing a bottom surface of the dynamic pressure plate, and the inner contour covers the inner circumference in an axial direction of the rotating shaft. A motor comprising: a base, a bearing sleeve, a bearing is disposed inside the bearing sleeve; a rotor comprising a rotating shaft and a thrust plate, the rotating shaft is coupled to the bearing, and the thrust plate is disposed on the bearing One end of the rotating shaft; and a movable pressing plate disposed on one side of the bearing sleeve, and the dynamic pressing plate faces the thrust plate, the thrust plate is located between the bearing and the dynamic pressure plate, and the dynamic pressure plate faces the The surface of one of the thrust plates is provided with a plurality of dynamic pressure grooves, and the center of the dynamic pressure plate is provided with a hole groove, and the surface of the dynamic pressure plate includes an inner contour and an outer contour facing the surface of the thrust plate, the inner contour covering the hole groove, The outer contour covers the inner contour, and the outer contour has a distance from the outer circumference of the dynamic pressure plate, and the inner contour forms an area with the outer contour, and each dynamic pressure groove is disposed in the area; The dynamic pressure groove has two side edges, each of the dynamic pressure grooves includes a first end portion and a second end portion, the two side edges respectively connecting the first end portion and the second end portion, the first end portion being located The inner contour, the second end is located at the outer contour, the table The boundary contour is a circle centered on the center of the dynamic pressure plate, and the boundary contour is located between the inner contour and the outer contour, and the inner contour and the boundary contour form a first region, the boundary Between the contour and the outer contour, a second region is formed, and at least one side edge of each of the dynamic pressure grooves is formed in the first region to form an equiangular spiral. The section of one side edge in the second zone forms an involute line. A motor comprising: a base, a bearing sleeve, a bearing is disposed inside the bearing sleeve; a rotor comprising a rotating shaft and a thrust plate, the rotating shaft is coupled to the bearing, and the thrust plate is disposed on the bearing One end of the rotating shaft; and a movable pressing plate disposed on one side of the bearing sleeve, and the dynamic pressing plate faces the thrust plate, the thrust plate is located between the bearing and the dynamic pressure plate, and the dynamic pressure plate faces the One surface of the thrust plate is provided with a plurality of dynamic pressure grooves; The dynamic pressure plate comprises a plate and a seat body combined with each other, and the surface of the dynamic pressure plate facing the thrust plate is located on the plate, and the hardness of the seat body is greater than the hardness of the plate. The motor of claim 1, 2, 3 or 4, wherein the rotating shaft is provided with one end of the thrust plate adjacent to the hole. The motor of claim 1, wherein the thrust plate has an inner circumference facing a bottom surface of the dynamic pressure plate, the inner contour covering the inner circumference in an axial direction of the rotation shaft. The motor of claim 1, 2, 3 or 4, wherein each of the dynamic pressure grooves has two side edges, and a partial portion of each of the dynamic pressure grooves is centered on the hole groove Segments or all form a spiral. The motor of claim 7, wherein the spiral is an equiangular spiral. The motor of claim 1, wherein the dynamic pressure groove has two side edges, and each of the dynamic pressure grooves comprises a first end portion and a second end portion, wherein the two side edges respectively The first end portion and the second end portion are connected, the first end portion is located at the inner contour, and the second end portion is located at the outer contour. A motor having a thrust bearing according to claim 9, wherein a partial section or all of at least one side edge of each of the dynamic pressure grooves is formed to gradually extend from the first end toward the second end Incremental line. A motor having a thrust bearing according to claim 3, wherein a partial section or all of at least one side edge of each of the dynamic pressure grooves is formed to gradually extend from the first end toward the second end Incremental line. The motor of claim 9, wherein the distance between the two side edges is gradually increased from the first end toward the second end. The motor of claim 3, wherein the distance between the two side edges is gradually increased from the first end toward the second end. The motor of claim 9, wherein the inner contour and the outer contour are respectively The center of the dynamic pressure plate is a circular circle center. The motor of claim 14, wherein the surface comprises a boundary contour, the boundary contour is a circle centered on a center of the dynamic pressure plate, the boundary contour being located between the inner contour and the outer contour, wherein the boundary contour is located between the inner contour and the outer contour Forming a first region between the contour and the boundary contour, the boundary contour and the outer contour form a second region, and the at least one edge of each of the dynamic pressure grooves is at the first The segments in the region form an equiangular spiral, and the segments of the at least one edge in the second region form an involute. The motor of claim 15 wherein the inner contour has a first radius r _i relative to the center of the dynamic pressure plate, the outer contour having a second radius r _o relative to the center of the dynamic pressure plate, the boundary contour being opposite to the The third radius r _m of one of the centers of the dynamic platens can be expressed as follows: r _m = r _i + (r _{o -} r _i ) / K where 1 < K < 1.5. The motor of claim 3, wherein the inner contour has a first radius r _i relative to the center of the dynamic pressure plate, the outer contour having a second radius r _o relative to the center of the dynamic pressure plate, the boundary contour being opposite to the The third radius r _m of one of the centers of the dynamic platens can be expressed as follows: r _m = r _i + (r _{o -} r _i ) / K where 1 < K < 1.5. The motor of claim 16, wherein the angle of the equiangular spiral is 25° to 35°. The motor of claim 17, wherein the angle of the equiangular spiral is 25° to 35°. The motor of claim 16, wherein the inflection line has a tangent angle of 11° to 13° at an end point of the outer contour. The motor of claim 17, wherein the inflection line has a tangent angle of 11 to 13 degrees at an end point of the outer contour. The motor of any one of claims 1 to 4, wherein the number of the plurality of dynamic pressure grooves is 12 to 20. The motor of claim 22, wherein the number of the plurality of dynamic pressure grooves is 16. The motor according to any one of claims 1 to 4, wherein each of the dynamic pressure grooves has a depth in the axial direction of the rotating shaft of 20 to 30 μm. The motor of claim 24, wherein each of the dynamic pressure grooves has a depth in the axial direction of the rotating shaft of 24 to 26 μm. The motor of any one of claims 1 to 4, wherein the bearing sleeve is internally provided with a positioning member coupled to the inner peripheral wall of the bearing sleeve, and the positioning member abuts the bearing. The motor of claim 26, wherein one side of the thrust plate is spaced from a surface of the dynamic pressure plate, and the other side of the thrust plate is spaced apart from the bearing or the positioning member. The motor of any one of claims 1 to 3, wherein the dynamic pressure plate comprises a plate and a seat body coupled to each other, and the dynamic pressure plate is located on the surface of the thrust plate at the surface of the plate. The hardness is greater than the hardness of the sheet. The motor of any one of claims 1 to 4, wherein the dynamic pressure plate is disposed on a bottom cover, and a seal ring is disposed between the dynamic pressure plate and the bottom cover. A dynamic pressure plate for a motor, comprising: a plate having a surface of one of the plurality of dynamic pressure grooves formed by etching or electroforming; and a body having a hardness greater than a hardness of the plate, The sheet is bonded to the seat body on one side of the surface. The dynamic pressure plate of the motor according to claim 30, wherein the plate has a hole in the center of the plate. The dynamic pressure plate of the motor according to claim 30, wherein the plate is a soft electric Road board. The movable plate of the motor according to claim 30, wherein the seat body is a plate made of a metal material. The dynamic pressure plate of the motor according to claim 30, 31, 32 or 33, wherein the number of the plurality of dynamic pressure grooves is 12-20. The dynamic pressure plate of the motor according to claim 34, wherein the number of the plurality of dynamic pressure grooves is 16. The dynamic pressure plate of the motor of claim 30, 31, 32 or 33, wherein each of the dynamic pressure grooves has a depth in the axial direction of 20 to 30 μm, and the axial direction is perpendicular to the surface. The dynamic pressure plate of the motor according to claim 36, wherein each of the dynamic pressure grooves has a depth of 24 to 26 μm in the axial direction.