TW201813255A - Motor and dynamic pressure plate thereof - Google Patents

Abstract

A motor and a dynamic pressure plate thereof are disclosed for improving the rotating-smoothness of prior motor. This motor includes a base, a rotor and a dynamic pressure plate. The base has a bearing sleeve with a bearing inside. The rotor has a shaft and a thrust plate, with the shaft connects with the bearing and the thrust plate is set at one end of the shaft. The dynamic pressure plate is set by one side of the bearing sleeve, with the dynamic pressure plate faces to the thrust plate, with the thrust plate is located between the bearing and the dynamic pressure plate, with the dynamic pressure plate has some dynamic pressure grooves on a surface facing to the thrust plate.

Description

   Motor and its dynamic pressure plate   

The invention relates to a motor, in particular to a motor provided with a dynamic pressure plate.

Please refer to FIG. 1, which is a conventional motor 9 including 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 rotatably coupled to the sleeve 91, so that the shaft 92 can be pivoted relative to the sleeve 91 when being driven. An embodiment similar to the conventional motor 9 has been disclosed in the Chinese Patent No. 1249887 "Spindle Motor and Assembly Method" patent.

One side of the sleeve 91 is provided with an axial thrust plate 911, and one end of the shaft 92 is combined with a thrust plate 921. The axial thrust plate 911 and the thrust plate 921 form an axial direction to support the shaft 92. Axial thrust bearing section. In detail, a lubricating fluid such as oil can 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 opposite surfaces of the axial thrust plate 911 and the thrust plate 921 are flat. When the shaft 92 receives pressure or generates vibration during the rotation, the axial thrust plate 911 and the thrust plate 921 The thickness of the lubricating fluid layer in between will become thinner, and even the axial thrust plate 911 and the thrust plate 921 are in direct contact with each other. Accordingly, the reduction in the friction torque of the shaft 92 is limited.

In view of this, the conventional motor 9 has a problem that the shaft 92 cannot rotate smoothly, and it is still necessary to improve it.

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 of the invention, the technical means used in the present invention include: a motor including: a base provided with a bearing sleeve, the bearing sleeve is provided with a bearing inside; a rotor, the rotor includes a rotating shaft and a stop 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 dynamic pressure plate, the dynamic pressure plate is disposed on one side of the bearing sleeve, and the dynamic pressure plate faces the thrust plate, the thrust A plate is located between the bearing and the dynamic pressure plate, and a plurality of dynamic pressure grooves are provided on one surface of the dynamic pressure plate facing the thrust plate.

A hole slot is provided in the center of the dynamic pressure plate. Thereby, a receiving space for receiving a lubricating fluid is formed between the dynamic pressure plate and the bearing, and the hole groove communicates with the receiving space, so that the hole groove can serve as a lubricating fluid storage groove.

Wherein, one end of the rotating shaft provided with the thrust plate is adjacent to the hole groove. Accordingly, in addition to lubricating the thrust plate, the lubricating fluid contained in the accommodating space can also lubricate one end of the rotating shaft at the same time.

The surface of the dynamic pressure plate facing the thrust plate includes an inner contour and an outer contour, the inner contour covers the hole and the groove, the outer contour covers the inner contour, and the outer contour and the outer peripheral edge of the dynamic pressure plate have a An interval forms a region between the inner contour and the outer contour, and each of the dynamic pressure grooves is disposed in the region. Thereby, each of the dynamic pressure grooves does not communicate with the hole groove or the outer peripheral edge of the dynamic pressure plate.

The thrust plate has an outer peripheral edge facing one of the bottom plates of the dynamic pressure plate. The outer peripheral edge covers the outer contour in the axial direction of the rotating shaft, so that the dynamic pressure grooves do not extend outward along the radial direction of the rotating shaft. Exceed the thrust plate.

Wherein, the thrust plate has an inner peripheral edge facing one of the bottom plates of the dynamic pressure plate, and the inner contour covers the inner peripheral edge in the axial direction of the rotating shaft, so that the dynamic pressure grooves do not extend inward along the radial direction of the rotating shaft. Exceed the thrust plate.

Wherein, each of the dynamic pressure grooves has two side edges and is centered on the hole groove. Part or all of at least one side edge of each of the dynamic pressure grooves forms a spiral, and the spiral is equiangular. Spiral. By forming a spiral on 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. Each of the dynamic pressure grooves includes 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. One end is located on the inner contour, and the second end is located on the outer contour. Thereby, each of the dynamic pressure grooves extends from the inner contour to the outer contour.

Wherein, a part or all of at least one side edge of each of the dynamic pressure grooves forms an involute line that gradually extends from the first end portion toward the second end portion. By forming at least one side edge of each of the dynamic pressure grooves to form an involute line, it is possible to effectively reduce the friction torque when the rotary shaft rotates.

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 dynamic pressure groove can be gradually increased outward along the radial direction of the rotation axis, so that the dynamic pressure plate and the The lubricating fluid layer between the thrust plates can be uniformly stressed.

Wherein, the inner contour and the outer contour are each a circle with the center of the dynamic pressure plate as a circle center. 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 includes a boundary contour, the boundary contour is a circle with the center of the dynamic pressure plate as a circle, the boundary contour is located between the internal contour and the external contour, and the first contour is formed between the internal contour and the boundary contour. A second region is formed between the boundary contour and the outer contour, with the hole groove as the center, and at least one side edge of each of the dynamic pressure grooves in the first region forms an equiangular spiral Line, the section of the at least one side edge in the second region forms an involute line. By forming at least one edge of each of the dynamic pressure grooves into the shape described above, it is possible to effectively reduce the friction torque when the rotating shaft rotates.

Wherein, the inner contour has a first radius r _i relative to the center of the dynamic plate, the outer contour has a second radius r _o relative to the center of the dynamic plate, and the boundary contour may have a third radius r _m relative to one of the center of the dynamic plate. The expression is as follows: r _m = r _i + (r _o -r _i ) / K, where 1 <K <1.5, so as to ensure that the range of the first region is large enough that at least one side of each of the dynamic pressure grooves The section of the edge forming the equiangular spiral is long enough to appropriately allocate the ratio of the section of the at least one side of the edge forming the equiangular spiral to the section forming the involute to increase the effect of reducing the frictional torque of the rotating shaft.

Wherein, the angle of the equiangular spiral is 25 ° ~ 35 °, and the tangent angle of the involute line at the endpoint of the outer contour is 11 ° ~ 13 °, so as to reduce the effect of friction torque of the rotating shaft. More significant.

Among them, the number of the plurality of dynamic pressure grooves is 12-20, and preferably 16 so that the effect of reducing the friction torque of the rotating shaft is more significant.

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 more significant.

A positioning member may be provided inside the bearing sleeve, the positioning member is coupled to the inner peripheral wall of the bearing sleeve, and the positioning member abuts the bearing, thereby supporting the bearing, and then positioning the bearing on the bearing sleeve.

One side of the thrust plate is kept at a distance from the surface of the dynamic pressure plate, and the other side of the thrust plate is kept at a distance from the bearing or the positioning member, so that the rotating shaft can be freely pivoted unhindered. .

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

The dynamic pressure plate includes a plate and a base body combined with each other. The surface of the dynamic pressure plate facing the thrust plate is located on the plate, and the hardness of the base body is greater than the hardness of the plate. Therefore, by opening the plurality of dynamic pressure grooves on the plate with a smaller hardness, the processing difficulty of the plurality of dynamic pressure grooves can be reduced, and the seat body with a larger hardness can still maintain the rigidity of the dynamic plate.

The surface of the plate is etched or electroformed to form the dynamic pressure grooves. Thereby, the processing difficulty of the dynamic pressure grooves can be effectively reduced, and the forming accuracy of the dynamic pressure grooves 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 may be made of rubber or silicone. Thereby, the leakage of the lubricating fluid in the accommodating space between the dynamic pressure plate and the bottom cover can be prevented.

A dynamic pressure plate for a motor includes: a plate, one surface of which is provided with several dynamic pressure grooves formed by etching or electroforming; and a body whose hardness is greater than the hardness of the plate. One side of the plate facing away from the surface is bonded to the base. Thereby, the dynamic pressure plate can achieve the effects of reducing the processing difficulty of the several dynamic pressure grooves and maintaining the rigidity of the dynamic pressure plate.

The center of the plate is provided with a hole slot. Therefore, since the hardness of the plate is relatively small, the processing difficulty of the hole and groove can be effectively reduced.

The board is a flexible circuit board. Thereby, the surface of the plate can be formed into a plurality of dynamic pressure grooves by means of etching or electroforming.

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

Among them, the number of the plurality of dynamic pressure grooves is 12-20, and preferably 16, so that the effect of reducing the friction torque of a rotating shaft is more significant.

Each of the dynamic pressure grooves has a depth of 20 to 30 μm in one axial direction, 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 more significant.

With the above-mentioned structure, the motor and the dynamic pressure plate of the embodiments of the present invention can be provided with a plurality of dynamic pressure grooves on the surface of the dynamic pressure plate, so that the lubricating fluid is filled in each of the dynamic pressure grooves. 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‧‧‧ opening

112‧‧‧Cover

12‧‧‧bearing

13‧‧‧ Positioning piece

14‧‧‧sealing ring

2‧‧‧ rotor

21‧‧‧ shaft

22‧‧‧thrust plate

221‧‧‧ outer periphery

222‧‧‧Inner periphery

3‧‧‧ dynamic pressure plate

3a‧‧‧ plates

3b‧‧‧ seat

31‧‧‧ surface

32‧‧‧Dynamic pressure ditch

321‧‧‧Side Margin

322‧‧‧first end

323‧‧‧second end

33‧‧‧hole slot

34‧‧‧ outer periphery

341‧‧‧concave

35‧‧‧Groove

S‧‧‧ accommodation space

C1‧‧‧ inside contour

C2‧‧‧Outline

C3‧‧‧ Boundary outline

R‧‧‧ area

R1‧‧‧First Zone

R2‧‧‧Second Zone

θ 1‧‧‧ angle

θ 2‧‧‧ angle

[Learning]

9‧‧‧ Motor

91‧‧‧ sleeve

911‧‧‧Axial thrust plate

92‧‧‧axis

921‧‧‧thrust plate

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

FIG. 2 is a schematic cross-sectional view of a combined structure according to the first embodiment of the present invention.

FIG. 3 is a schematic perspective view of a dynamic pressure plate according to the first embodiment of the present invention.

FIG. 4 is a schematic top view of a dynamic pressure plate according to the first embodiment of the present invention.

FIG. 5 is a diagram showing the relationship between the tangent angle of the segment of the dynamic pressure groove forming an involute line at the end point of the outer contour and the friction torque of the rotating shaft according to the first embodiment of the present invention.

FIG. 6 is a relationship diagram 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 relationship diagram between the depth of the dynamic pressure groove and the friction torque of the rotating shaft according to the first embodiment of the present invention.

FIG. 8 is a schematic view of a combined structural part where the positioning member of the base is placed outside the bearing according to the embodiment of the present invention.

FIG. 9 is an exploded view of the structure of a dynamic pressure plate according to the first embodiment of the present invention.

FIG. 10 is a schematic cross-sectional view of a combined structure according to a second embodiment of the present invention.

FIG. 11 is an exploded view of the structure of a dynamic pressure plate according to the second embodiment of the present invention.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments of the present invention in detail with the accompanying drawings as follows: Please refer to FIG. 2, The motor according to the first embodiment of the present invention includes a base 1, a rotor 2, and a dynamic pressure plate 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. The outer periphery of the bearing sleeve 11 can be used to combine components such as a housing, an iron 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 may be a dynamic pressure bearing. However, the bearing 12 may also be a structure of another type of bearing (for example, a copper bearing), which is not limited in the present invention. In addition, a positioning member 13 may be provided inside the bearing sleeve 11. The positioning member 13 may be a ring or a plurality of blocks. The positioning member 13 may be coupled to the inner peripheral wall of the bearing sleeve 11, and the positioning member 13 abuts. The bearing 12 is used to support 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 by means of a tight fit or being integrally provided 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 protrude into the bearing sleeve 11 through the opening 111, and the rotating shaft 21 is coupled to the bearing 12 so that the rotating shaft 21 can rotate relative to the bearing sleeve 11. Therefore, the rotor 2 is rotatably coupled to the base 1. The thrust plate 22 is disposed on one end of the rotating shaft 21. Wherein, the rotating shaft 21 and the thrust plate 22 can both be made of a metal material, so that the rotating shaft 21 and the thrust plate 22 can be combined by laser welding to improve the bonding strength of the rotating shaft 21 and the thrust plate 22.

The dynamic pressure plate 3 is disposed on one side of the bearing sleeve 11 away from the opening 111. An accommodation 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 accommodation 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. A plurality of dynamic pressure grooves 32 are formed on a surface 31 of the dynamic pressure plate 3 facing 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 be used for accommodating a lubricating fluid (for example, oil), so that the dynamic pressure plate 3 and A lubricating fluid layer (eg, an oil film) can be formed between the thrust plates 22, so that the dynamic pressure plate 3 and the thrust plate 22 can maintain 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 receives 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 motors of the embodiments of the present invention are listed in detail below and explained one by one: Please refer to FIG. 2 and FIG. S, the hole groove 33 can be used as a lubricating fluid storage groove. One end of the rotating shaft 21 provided with the thrust plate 22 can be adjacent to the hole groove 33, thereby the lubrication fluid contained in the accommodating space S can not only lubricate the thrust plate 22, but also simultaneously. One end of the rotating shaft 21.

Please refer to Figs. 3 and 4, the surface 31 includes an inner contour C1 and an outer contour C2, the inner contour C1 covers the hole groove 33, the outer contour C2 covers the inner contour C1, and the outer contour C2 and An outer peripheral edge of the dynamic pressure plate 3 has a distance, and a region R is formed between the inner contour C1 and the outer contour C2. Each of the dynamic pressure grooves 32 is disposed in the region R. Accordingly, each of the dynamic pressure grooves 32 does not communicate with the hole groove 33 or the outer peripheral edge of the dynamic pressure plate 3. Among them, please refer to FIG. 2 together. The thrust plate 22 faces an outer peripheral edge 221 and an inner peripheral edge 222 toward one of the bottom plates of the dynamic pressure plate 3. The outer peripheral edge 221 can cover the axial direction of the rotating shaft 21. The outer contour C2, so that each of the dynamic pressure grooves 32 does not extend outward beyond the thrust plate 22 in the radial direction of the rotary shaft 21; relatively, the inner contour C1 may cover the inner peripheral edge 222 in the axial direction of the rotary shaft 21 So that each of the dynamic pressure grooves 32 does not extend inward beyond the thrust plate 22 in the radial direction of the rotating shaft 21. In other words, each of the dynamic pressure grooves 32 can be located within the range of the thrust plate 22 in the axial direction of the rotating shaft 21, so that the plurality of dynamic pressure grooves 32 can surely avoid the gap between the dynamic pressure plate 3 and the thrust plate 22. The lubricating fluid layer is thinned to prevent the dynamic pressure plate 3 from directly contacting the thrust plate 22.

Please refer to FIG. 3 and FIG. 4, each of the dynamic pressure grooves 32 has two side edges 321, and the hole groove 33 is the center. At least one side edge 321 of each of the dynamic pressure grooves 32 is partially or completely connected. Form a spiral or an involute. In detail, each of the dynamic pressure grooves 32 includes a first end portion 322 and a second end portion 323, and the two side edges 321 are respectively connected to the first end portion 322 and the second end portion 323, and the first end The portion 322 is located in the inner contour C1, and the second end portion 323 is located in the outer contour C2, so that each of the dynamic pressure grooves 32 extends from the inner contour C1 to the outer contour C2. In this embodiment, the inner contour C1 and the outer contour C2 are each a circle with the center of the dynamic pressure plate 3 as a circle. Therefore, the first end portion 322 and the second end portion 323 of each of the dynamic pressure grooves 32 are respectively It is located on the inner contour C1 and the outer contour C2 forming a concentric circle. A part or all of at least one side edge 321 of each of the dynamic pressure grooves 32 forms an equiangular spiral with the hole groove 33 as a center; or gradually formed from the first end portion 322 toward the second end portion 323. Stretch one to the involute line. 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. The boundary contour C3 is also a circle with the center of the dynamic pressure plate 3 as a circle. The boundary contour C3 is located between the inner contour C1 and the outer contour C2. The boundary contour C3 divides a 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, the second region R2 is formed between the boundary contour C3 and the outer contour C2, and the dynamic groove is centered on the hole groove 33. The section of at least one side edge 321 of 32 in the first region R1 forms an equiangular spiral, and the section of the at least one side edge 321 in the second region R2 forms an involute line. In other words, one section of at least one side edge 321 of each of the dynamic pressure grooves 32 forms an equiangular spiral with the hole groove 33 as the center, and the other section is formed by the first end portion 322 toward the The second end portion 323 extends one of the gradually extending lines. By forming at least one side edge 321 of each of the dynamic pressure grooves 32 into the shape described above, it is possible to effectively reduce the friction torque when the rotating shaft 21 rotates.

In more detail, as shown in FIG. 3, the inner contour C1 has a first radius r _i relative to the center of the dynamic pressure plate 3, and the outer contour C2 has a second radius r _o relative to the center of the dynamic pressure plate 3. The third radius r _{m of the} boundary contour C3 with respect to one of the centers 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 making the third radius r _{m of} the boundary contour C3 conform to the above formula (1), it can be 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 long enough to appropriately allocate the ratio of the section where the at least one side edge 321 forms an equilateral spiral to the section which forms an involute line, so as to improve the effect of reducing the friction torque of the rotating shaft 21.

Among them, in addition to the ratio of the section where at least one side edge 321 of each of the dynamic pressure grooves 32 forms an equilateral spiral and the section which forms an involute, the shape of the equiangular spiral and the involute also affects The effect of the plurality of dynamic pressure grooves 32 on reducing the friction torque of the rotating shaft 21. Please refer to FIG. 5 together. The tangent angle θ 2 of the involute line at the end point of the outer contour C2 is 11 ° to 13 °, and the angle θ 1 of the equiangular spiral is set to 25 °. At ~ 35 °, the effect of reducing the friction torque of the rotating shaft 21 is most significant.

In addition, the number and depth of the plurality of dynamic pressure grooves 32 will directly affect the thickness of the lubricating fluid layer between the dynamic pressure plate 3 and the thrust plate 22, so it will also affect the plurality of dynamic pressure grooves 32 to reduce the rotation shaft. 21 friction torque effect. Please refer 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 significant. 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 significant. Accordingly, the depth of each of the dynamic pressure grooves 32 is preferably 20 to 30 μm, and more preferably 24 to 26 μm.

Please refer to FIG. 2. In this 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. Therefore, the two sides of the thrust plate 22 are respectively Toward the positioning member 13 and the surface 31 of the dynamic pressure plate 3. However, referring to FIG. 8, in some embodiments of the present invention, the positioning member 13 may be disposed outside the bearing 12 in the radial direction of the rotating shaft 21, so one side of the thrust plate 22 may face the same at the same time. The bearing 12 and the positioning member 13 are not limited thereto. Among them, since the accommodating space S between the dynamic pressure plate 3 and the bearing 12 can be used for accommodating the lubricating fluid, one side of the thrust plate 22 can be maintained at a distance from the surface 31 of the dynamic pressure plate 3, and the thrust The other side of the plate 22 can maintain a distance from the bearing 12 or the positioning member 13, so that the rotating shaft 21 can freely pivot.

Referring to FIG. 2, in this embodiment, a bottom cover 112 is provided on one side of the bearing sleeve 11 away from the opening 111, and the bottom cover 112 closes one side of the bearing sleeve 11 away from the opening 111, so that It forms closed. The dynamic pressure plate 3 may be disposed on the bottom cover 112 so that it is formed on one 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 preferably smaller than the thickness of the bottom cover 112, so that the overall axial height of the motor of the first embodiment is not easily affected by the installation 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 process the dynamic pressure grooves 32 on the surface 31 of the dynamic pressure plate 3. For this reason, please refer to FIG. 9. In this embodiment, the dynamic pressure plate 3 includes a plate 3 a and a base 3 b combined with each other. The surface 31 of the dynamic pressure plate 3 facing the thrust plate 22 is located on the plate. The hardness of the sheet 3a and the seat 3b is greater than the hardness of the plate 3a. Therefore, by opening the plurality of dynamic pressure grooves 32 on the plate 3a having a relatively small hardness, the processing difficulty of the plurality of dynamic pressure grooves 32 can be reduced. However, the plate 3a is combined with a seat having a relatively high hardness. 3b, the dynamic pressure plate 3 can still maintain sufficient rigidity. In addition, a through hole or a blind hole communicating with the surface 31 can be set as the hole groove 33 in the center of the plate 3a. Since the hardness of the plate 3a is small, the processing difficulty of the hole groove 33 can be effectively reduced. .

In detail, the plate 3a of the dynamic pressure plate 3 may be a flexible circuit board. Therefore, the surface 31 of the plate 3a may 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 a copper foil, so the copper foil may be etched to form the dynamic pressure grooves 32. 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 grooves 32. Accuracy. The base 3b may be a plate made of a metal material (for example, a stainless steel plate or an aluminum plate), whereby the hardness of the base 3b will be much greater than the hardness of the plate 3a, so that the base 3b can effectively maintain the base. The rigidity of the dynamic pressure plate 3. The base 3b may be provided with a groove 35 for accommodating the plate 3a, thereby improving the bonding strength between the plate 3a and the base 3b. However, please refer to Figs. 10 and 11 for the motor according to the second embodiment of the present invention. The base 3b does not need to be grooved, and the plate 3a can be fixed to the base by welding or bonding. 3b, so the present invention is not limited to this.

Furthermore, the seat body 3b includes an outer peripheral edge 34, which can abut against the inner peripheral wall of the bearing sleeve 11. The seat body 3b is provided with a recess 341 on the outer periphery, and the recess 341 can be on the dynamic pressure plate. During the assembly process of 3, the nozzle is extended into the accommodating space S to facilitate the injection of the lubricating fluid. In addition, the concave portion 341 can also be combined with 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 further include a seal ring 14 between the dynamic pressure plate 3 and the bottom cover 112. The seal ring 14 may be made of a material having good elasticity such as rubber or silicone. As a result, the sealing ring 14 can increase the closeness between the dynamic pressure plate 3 and the bottom cover 112 to prevent the lubricating fluid in the accommodation space S from leaking between the dynamic pressure plate 3 and the bottom cover 112.

In summary, the motor and the dynamic pressure plate 3 of the embodiments of the present invention can increase the number of the dynamic pressure grooves 32 by providing a plurality of dynamic pressure grooves 32 on the surface 31 of the dynamic pressure plate 3. The effective thickness and supporting force of the lubricating fluid layer between the dynamic pressure plate 3 and the thrust plate 22. According to this, when the shaft 92 of the conventional motor 9 receives pressure or generates vibration during the rotation, the thickness of the lubricating fluid layer between the axial thrust plate 911 and the thrust plate 921 will become thinner, or even produce A situation where 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 becoming thin, so as to prevent the dynamic pressure plate 3 from directly contacting the thrust plate 22, and indeed 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 body 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 grooves 32 reduce the processing difficulty of the dynamic pressure grooves 32 and maintain the rigidity of the dynamic pressure plate 3.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications to the above embodiments without departing from the spirit and scope of the present invention. The technical scope protected by the invention, so the scope of protection of the present invention shall be determined by the scope of the appended patent application.

Claims (37)

    A motor includes: a base provided with a bearing sleeve, the bearing sleeve is provided with a bearing inside; a rotor including a rotating shaft and a thrust plate, the rotating shaft is combined with the bearing, and the thrust plate is disposed on One end of the rotating shaft; and a dynamic pressure plate, which is disposed on one side of the bearing sleeve, and the dynamic pressure 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 There are several dynamic pressure grooves on one surface of the thrust plate.         The motor according to item 1 of the scope of the patent application, wherein the center of the dynamic pressure plate is provided with a hole slot.         The motor according to item 2 of the scope of patent application, wherein one end of the rotating shaft provided with the thrust plate is adjacent to the slot.         The motor according to item 2 of the scope of patent application, wherein the surface of the dynamic pressure plate facing the thrust plate includes an inner contour and an outer contour, the inner contour covers the hole and the groove, the outer contour covers the inner contour, and the An outer contour has a distance from an outer peripheral edge of the dynamic pressure plate, and a region is formed between the inner contour and the outer contour, and each of the dynamic pressure grooves is disposed in the region.         The motor according to item 4 of the scope of patent application, wherein the thrust plate has an outer periphery facing a bottom face of the dynamic pressure plate, and the outer periphery covers the outer contour in the axial direction of the rotating shaft.         The motor according to item 4 of the patent application, wherein the thrust plate has an inner peripheral edge facing a bottom face of the dynamic pressure plate, and the inner contour covers the inner peripheral edge in the axial direction of the rotating shaft.         The motor according to item 2 of the scope of patent application, wherein each of the dynamic pressure grooves has two side edges, and the hole groove is the center, and a part or all of at least one side edge of each of the dynamic pressure grooves forms one Spiral.         The motor according to item 7 of the patent application scope, wherein the spiral is an equiangular spiral.         The motor according to item 4 of the scope of patent application, wherein each of the dynamic pressure grooves has two side edges, each of the dynamic pressure grooves includes a first end portion and a second end portion, and the two side edges are respectively connected to the first end portion. An end portion and the second end portion, the first end portion is located in the inner contour, and the second end portion is located in the outer contour.         The motor with a thrust bearing according to item 9 of the scope of the patent application, wherein at least a part of or at least one side edge of each of the dynamic pressure grooves is formed as one of gradually extending from the first end portion toward the second end portion. Gradually extending.         According to the motor of claim 9, the distance between the two side edges is gradually increased from the first end portion toward the second end portion.         The motor according to item 9 in the scope of the patent application, wherein the inner contour and the outer contour are respectively circles with a center of the dynamic pressure plate as a circle.         According to the motor of claim 12, wherein the surface includes a boundary contour, the boundary contour is a circle with the center of the dynamic pressure plate as a circle, and the boundary contour is located between the inner contour and the outer contour. A first region is formed between the contour and the boundary contour, a second region is formed between the boundary contour and the outer contour, and the hole groove is the center. At least one side edge of each dynamic pressure groove is on the first The sections in the area form an equiangular spiral, and the sections of the at least one side edge in the second area form an involute line.     The motor according to item 13 of the patent application, wherein the inner contour has a first radius r _i relative to the center of the dynamic plate, the outer contour has a second radius r _o relative to the center of the dynamic plate, and the boundary contour is relative to the One of the third radii r _{m at the} center of the movable platen can be expressed as follows: r _m = r _i + (r _o -r _i ) / K where 1 <K <1.5.     The motor according to item 13 of the scope of patent application, wherein the angle of the equiangular spiral is 25 ° ~ 35 °.         The motor according to item 13 of the scope of patent application, wherein a tangent angle of the involute line to an end point of the outer contour is 11 ° to 13 °.         The motor according to any one of claims 1 to 16, in which the number of the dynamic pressure grooves is 12-20.         The motor according to item 17 of the scope of patent application, wherein the number of the plurality of dynamic pressure grooves is 16.         The motor according to any one of claims 1 to 16, in which the depth of each of the dynamic pressure grooves in the axial direction of the rotating shaft is 20 to 30 μm.         According to the motor described in claim 19, wherein the depth of each of the dynamic pressure grooves in the axial direction of the rotating shaft is 24-26 μm.         The motor according to any one of claims 1 to 16, wherein a positioning member may be provided inside the bearing sleeve, the positioning member is coupled to the inner peripheral wall of the bearing sleeve, and the positioning member abuts the bearing.         According to the motor of claim 21, one side of the thrust plate maintains a distance from the surface of the dynamic pressure plate, and the other side of the thrust plate maintains a distance from the bearing or the positioning member.         The motor according to any one of claims 1 to 16, wherein the thrust plate and the rotating shaft are combined by laser welding.         The motor according to any one of claims 1 to 16, wherein the dynamic pressure plate includes a plate and a base body combined with each other, and a surface of the dynamic pressure plate facing the thrust plate is located on the plate body and the base body. The hardness is greater than the hardness of the plate.         According to the motor of claim 24, wherein the surface of the plate is etched or electroformed to form the plurality of dynamic pressure grooves.         The motor according to item 24 of the scope of patent application, wherein the plate is a flexible circuit board.         The motor according to item 24 of the scope of patent application, wherein the seat is a plate body made of a metal material.         The motor according to any one of claims 1 to 16, 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.         The motor according to any one of claim 28, wherein the seal ring is made of rubber or silicone.         A dynamic pressure plate for a motor includes: a plate, one surface of which is provided with several dynamic pressure grooves formed by etching or electroforming; and a body whose hardness is greater than the hardness of the plate. One side of the plate facing away from the surface is bonded to the base.         According to the dynamic pressure plate of the motor according to item 30 of the scope of patent application, wherein the plate is provided with a hole slot in the center.         The dynamic pressure plate of the motor according to item 30 of the patent application scope, wherein the plate is a flexible circuit board.         According to the dynamic pressure plate of the motor according to item 30 of the patent application scope, wherein the seat is a plate body made of metal material.         For example, the number of dynamic pressure grooves of the motor is 12 to 20, as described in the patent application scope No. 30, 31, 32 or 33.         According to the dynamic pressure plate of the motor according to item 34 of the scope of patent application, the number of the plurality of dynamic pressure grooves is 16.         For example, the dynamic pressure plate of the motor according to item 30, 31, 32, or 33 of the patent application scope, wherein each of the dynamic pressure grooves has a depth of 20-30 μm in one axial direction, and the axial direction is perpendicular to the surface.         According to the dynamic pressure plate of the motor according to item 36 of the scope of patent application, wherein the depth of each of the dynamic pressure grooves in the axial direction is 24-26 μm.