Motorized spindle machine body assembly, motorized spindle and machine tool

Abstract

The motorized spindle machine body assembly comprises a machine body outer sleeve, a stator installation seat, a first air bearing seat and a second air bearing seat, the machine body outer sleeve is provided with a machine body inner hole extending from the first end to the second end in the axial direction, and the stator installation seat is installed in the machine body inner hole through the first end of the machine body outer sleeve. The second air bearing seat is installed in the inner hole of the machine body through the second end of the machine body outer sleeve, the first air bearing seat is arranged in the inner hole of the machine body and clamped between the stator installation seat and the second air bearing seat, the first air bearing seat is provided with a first radial air bearing, and the second air bearing seat is provided with a second radial air bearing. A first thrust bearing assembly is arranged at the end, close to the second air bearing seat, of the first air bearing seat, and a second thrust bearing assembly is arranged at the end, close to the first air bearing seat, of the second air bearing seat. And the motorized spindle machine body assembly adopts an integrated clamping structure design, so that abnormal assembly of parts is reduced, and overall disassembly for dynamic balance is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the spindle field, in particular to a kind of electric spindle body assembly, electric spindle and machine tool. BACKGROUND

[0002] With the demand of economic development and technology soaring, more and more new technologies emerge in an endless stream, and the mechanical processing industry is also rising, especially the leading spindle industry technology innovation is very obvious. Due to the forming and machining of automobile optical mold and the increasing precision of high light industry, the electric spindle is forced to develop towards high speed and high precision. The existing electric spindle has congenital defects due to its structure, which makes it difficult to further improve the speed and precision. In addition, the stator and shaft core of the spindle will generate a lot of heat during high-speed rotation. How to effectively remove the heat is also a difficulty. SUMMARY

[0003] The utility model discloses a kind of electric spindle body assembly, electric spindle and machine tool, to at least solve one of the technical problems existing in prior art.

[0004] The utility model discloses the technical scheme for solving its technical problem is as follows:

[0005] First, an electric spindle body assembly, comprising a body sleeve, a stator mounting seat, a first air floating bearing seat and a second air floating bearing seat, the body sleeve is provided with a body bore extending from a first end to a second end in the axial direction, the stator mounting seat is mounted in the body bore by the first end of the body sleeve, the second air floating bearing seat is mounted in the body bore by the second end of the body sleeve, the first air floating bearing seat is arranged in the body bore and clamped between the stator mounting seat and the second air floating bearing seat, the first air floating bearing seat is provided with a first radial air floating bearing, the second air floating bearing seat is provided with a second radial air floating bearing, the first air floating bearing seat is provided with a first thrust bearing assembly at one end close to the second air floating bearing seat, and the second air floating bearing seat is provided with a second thrust bearing assembly at one end close to the first air floating bearing seat.

[0006] In combination with the first aspect, in some implementation modes of the first aspect, the stator mounting seat, the first air floating bearing seat and the second air floating bearing seat form an outer circumferential surface continuously extending in the axial direction inside the body bore, and the outer circumferential surface is attached to the inner wall of the body bore.

[0007] In combination with the first aspect and the above implementation modes, in some implementation modes of the first aspect, the outer circumferential surface of the stator mounting seat, the first air floating bearing seat and the second air floating bearing seat is provided with a cooling liquid groove continuously extending as a whole.

[0008] With reference to the first aspect and the above implementation manners, in some implementation manners of the first aspect, the cooling liquid groove comprises a spiral groove, the spiral groove comprises an inlet cooling liquid groove extending from the first end of the machine body cover to the second end, and a return cooling liquid groove extending from the second end of the machine body cover to the first end, the stator mounting base is provided with a cooling liquid inlet communicating with the inlet cooling liquid groove, and the stator mounting base is provided with a cooling liquid outlet communicating with the return cooling liquid groove, the first end of the first gas floating bearing seat has a first boss extending in the axial direction, the first gas floating bearing seat is provided with a first axial stepped surface outside the first boss, the stator mounting base has a first sleeve portion extending in the axial direction, the first sleeve portion is sleeved on the first boss, and an end portion of the first sleeve portion abuts against the first axial stepped surface, and the first gas floating bearing seat and the stator mounting base are provided with a first sealing ring.

[0009] With reference to the first aspect and the above implementation manners, in some implementation manners of the first aspect, the first gas floating bearing seat and the second gas floating bearing seat are provided with honeycomb-shaped axial heat dissipation holes.

[0010] With reference to the first aspect and the above implementation manners, in some implementation manners of the first aspect, the second end of the first gas floating bearing seat has a second boss extending in the axial direction, the first gas floating bearing seat is provided with a second axial stepped surface outside the second boss, the second gas floating bearing seat has a second sleeve portion extending in the axial direction, the second sleeve portion is sleeved on the second boss, and an end portion of the second sleeve portion abuts against the second axial stepped surface, and the first gas floating bearing seat and the second gas floating bearing seat are provided with a second sealing ring.

[0011] With reference to the first aspect and the above implementation manners, in some implementation manners of the first aspect, the first gas floating bearing seat is provided with a first flange matched with an axial end surface of the first end of the machine body cover, the first flange is assembled on the first end of the machine body cover through a first fastener, the second gas floating bearing seat is provided with a second flange matched with an axial end surface of the second end of the machine body cover, and the second flange is assembled on the second end of the machine body cover through a second fastener.

[0012] With reference to the first aspect and the above implementation manners, in some implementation manners of the first aspect, the first thrust bearing assembly and the second thrust bearing assembly each comprise a first thrust bearing annular part and a second thrust bearing annular part, the first thrust bearing annular part and the second thrust bearing annular part form flush axial thrust surfaces, and a throttling gap for jetting thrust gas is formed between the first thrust bearing annular part and the second thrust bearing annular part at the axial thrust surfaces.

[0013] In a second aspect, an electrospindle comprises a spindle core and the electrospindle body assembly of any implementation of the first aspect, the spindle core is supported by the first radial air bearing and the second radial air bearing on the electrospindle body assembly, the spindle core is provided with a flying disc matched with the first thrust bearing assembly and the second thrust bearing assembly, the stator mounting seat is provided with a stator, and the spindle core is provided with a rotor matched with the stator.

[0014] In a second aspect, a machine tool comprises the electrospindle of any implementation of the second aspect.

[0015] One of the technical solutions has at least one of the following advantages or beneficial effects: in the technical solution of the utility model, the stator mounting seat and the second air bearing seat are respectively installed at two ends of the body sleeve, the first air bearing seat is clamped through the stator mounting seat and the second air bearing seat on both sides, the electrospindle body assembly adopts an integrated clamping structure design, abnormal assembly of parts is reduced, and overall disassembly is facilitated for dynamic balance. Meanwhile, the thrust bearing assembly is arranged between the first air bearing seat and the second air bearing seat, that is, a spindle core flying disc centering structure is formed, the spindle can obtain higher rigidity, the thrust bearing assembly is far away from the rotor position, the influence of thermal deformation on the spindle core is reduced, and the stability of the shafting is improved. The embodiment of the utility model improves the spindle rigidity and precision.

[0016] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0018] Figure 1 is an embodiment structure schematic view of the utility model electrospindle;

[0019] Figure 2 is an embodiment stator mounting seat, first air bearing seat and second air bearing seat cooperation structure schematic view of the utility model electrospindle body assembly;

[0020] Figure 3 is an embodiment structure schematic view of the utility model first air bearing seat;

[0021] Figure 4 is an embodiment structure schematic view of the utility model second air bearing seat. DETAILED DESCRIPTION

[0022] The detailed description of the embodiments of the present application will be described in this section, and the preferred embodiments of the present application are shown in the drawings. The drawings are used to supplement the description of the text part of the specification, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application. However, it cannot be understood as a limitation on the protection scope of the present application.

[0023] In the present application, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical scheme of the present application, and is not intended to indicate or imply that the technical features referred to must have a specific orientation, structure and operation in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0024] In the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "more than" and the like are not included in the number; "above", "below", "within" and the like are understood to include the number. In the description of the present application, if "first" and "second" are described, they are only used to distinguish technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.

[0025] In the present application, unless otherwise specified, the words "set", "install", "connect" and the like should be broadly understood, for example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication or interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0026] Referring to Figure 1 , Figure 2The utility model discloses an electric spindle body assembly, including body outer cover 100, stator mounting seat 200, first gas bearing seat 300 and second gas bearing seat 400, body outer cover 100 is sleeve -shaped, and body outer cover 100 extends to second end 102 along the axial direction by first end 101, and body outer cover 100 is equipped with the body inner hole 103 of extending to second end 102 along the axial direction by first end 101, and stator mounting seat 200 is installed in body inner hole 103 by first end 101 of body outer cover 100, and stator mounting seat 200 can adopt the connection of screw thread, pin, screw etc. with body outer cover 100, and second gas bearing seat 400 is installed in body inner hole 103 by second end 102 of body outer cover 100, and second gas bearing seat 400 can adopt the connection of screw thread, pin, screw etc. with body outer cover 100, and first gas bearing seat 300 is set up in body inner hole 103 and is clamped between stator mounting seat 200 and second gas bearing seat 400, in other words, one end of first gas bearing seat 300 and stator mounting seat 200 abut, and the other end of first gas bearing seat 300 and second gas bearing seat 400 abut, and first gas bearing seat 300 is equipped with first radial gas bearing 301, and second gas bearing seat 400 is equipped with second radial gas bearing 401, and first gas bearing seat 300 is equipped with first thrust bearing assembly 302 in one end close to second gas bearing seat 400, and second gas bearing seat 400 is equipped with second thrust bearing assembly 401 in one end close to first gas bearing seat 300.

[0027] In combination Figure 1 、 Figure 2 The utility model discloses a technical scheme, and stator mounting seat 200 and second gas bearing seat 400 are installed at both ends of body outer cover 100 respectively, and first gas bearing seat 300 is clamped through stator mounting seat 200 and second gas bearing seat 400 on both sides, and the electric spindle body assembly adopts integrated clamping structure design, reduces the assembly anomaly of spare part, and is convenient to whole dismounting and carries out dynamic balance. Meanwhile, thrust bearing assembly is arranged between first gas bearing seat 300 and second gas bearing seat 400, that is, forms the structure of middle -positioning of shaft core flying disc, can make spindle obtain higher rigidity, makes thrust bearing assembly away from rotor position, reduces the influence of thermal deformation to shaft core, improves the stability of shafting. The utility model discloses an embodiment improves spindle rigidity, precision.

[0028] In some embodiments, referring to Figure 1 、 Figure 2The stator mounting seat 200, the first air floating bearing seat 300 and the second air floating bearing seat 400 form an outer side circumferential surface 500 extending continuously in the axial direction inside the inner hole 103 of the machine body, and the outer side circumferential surface 500 is attached to the inner wall of the inner hole 103 of the machine body. The outer side circumferential surface 500 of the stator mounting seat 200, the first air floating bearing seat 300 and the second air floating bearing seat 400 cooperates with the machine body sleeve 100 to form a stable overall structure, reduces the assembly abnormality of parts, and facilitates the overall disassembly for dynamic balance.

[0029] The spindle stator and the shaft core generate a large amount of heat during high-speed rotation, and how to effectively take away the heat is a difficulty. In some embodiments, see Figure 1 , Figure 2 , Figure 3 , Figure 4 The outer side circumferential surface 500 of the stator mounting seat 200, the first air floating bearing seat 300 and the second air floating bearing seat 400 is provided with a cooling liquid groove 501 extending continuously as a whole. In other words, the cooling liquid groove 501 of the outer side circumferential surface 500 of the stator mounting seat 200, the cooling liquid groove 501 of the outer side circumferential surface 500 of the first air floating bearing seat 300 and the cooling liquid groove 501 of the outer side circumferential surface 500 of the second air floating bearing seat 400 are connected in sequence to form a cooling liquid groove 501 extending continuously as a whole. The cooling liquid groove 501 cooperates with the outer side machine body sleeve 100 to form a continuously extending cooling channel. The cooling channel is in overall communication with the outer side circumferential surface 500 of the stator mounting seat 200, the first air floating bearing seat 300 and the second air floating bearing seat 400, ensuring maximum cooling area. This structure can maximize the heat of the spindle product and take it out of the shaft in time, reduce the influence of heat on the shaft core during high-speed operation, and ensure the safety of high-speed operation of the spindle.

[0030] The cooling liquid groove 501 can be arranged in the outer side circumferential surface 500 of the stator mounting seat 200, the first air floating bearing seat 300 and the second air floating bearing seat 400 in the shape of U or spiral, etc. In some embodiments, see Figure 2The cooling liquid tank 501 comprises a spiral groove spirally winding along the outer circumferential surface 500 of the stator mounting base 200, the first air floating bearing seat 300 and the second air floating bearing seat 400, and being in overall communication. The spiral groove comprises a liquid inlet cooling liquid tank and a liquid return cooling liquid tank. The liquid inlet cooling liquid tank extends from the first end 101 to the second end 102 of the machine body jacket 100, and the liquid return cooling liquid tank extends from the second end 102 to the first end 101 of the machine body jacket 100. The stator mounting base 200 is provided with a cooling liquid inlet 201 in communication with the liquid inlet cooling liquid tank, and is provided with a cooling liquid outlet 202 in communication with the liquid return cooling liquid tank. During operation, the cooling liquid enters through the cooling liquid inlet 201, flows through the liquid inlet cooling liquid tank and the liquid return cooling liquid tank, and then flows out through the cooling liquid outlet, thereby timely taking out the heat of the main shaft product outside the shaft, reducing the influence of heat on the high-speed operation of the shaft core assembly, and ensuring the safety of the high-speed operation of the main shaft.

[0031] In some embodiments, referring to Figure 1 The first end of the first air floating bearing seat 300 has a first boss 303 extending in the axial direction, and the first air floating bearing seat 300 is provided with a first axial stepped surface 304 outside the first boss 303. The stator mounting base 200 has a first sleeve portion 203 extending in the axial direction, the first sleeve portion 203 is sleeved on the first boss 303, and the end portion of the first sleeve portion 203 abuts against the first axial stepped surface 304. A first sealing ring is arranged between the first air floating bearing seat 300 and the stator mounting base 200. The first air floating bearing seat 300 and the stator mounting base 200 are connected in a radial sleeve connection and axial abutment manner, thereby fully ensuring the assembly precision between the first air floating bearing seat 300 and the stator mounting base 200. Meanwhile, the first sealing ring is used to ensure the sealing between the first air floating bearing seat 300 and the stator mounting base 200, thereby avoiding the leakage of cooling liquid between the first air floating bearing seat 300 and the stator mounting base 200.

[0032] In some embodiments, referring to Figure 1The second end of the first gas bearing seat 300 has a second boss 305 extending in the axial direction, the first gas bearing seat 300 is provided with a second axial stepped surface 306 outside the second boss 305, the second gas bearing seat 400 has a second sleeve part 402 extending in the axial direction, the second sleeve part 402 is sleeved on the second boss 305, and the end of the second sleeve part 402 abuts against the second axial stepped surface 306. The second gas bearing seat 400 is connected to the first gas bearing seat 300 in a radial sleeving and axial abutting manner, so that the assembly precision between the first gas bearing seat 300 and the second gas bearing seat 400 is fully ensured. Meanwhile, the sealing between the first gas bearing seat 300 and the second gas bearing seat 400 is ensured by means of the second sealing ring, so that the cooling liquid is prevented from leaking between the first gas bearing seat 300 and the second gas bearing seat 400.

[0033] In some embodiments, referring to Figure 3 、 Figure 4 The first gas bearing seat 300 and the second gas bearing seat 400 are provided with honeycomb-shaped axial heat dissipation holes 307 and 403, so that the heat dissipation area is further increased, the influence of heat on the high-speed operation of the shaft core assembly is further reduced, and the safety of the high-speed operation of the main shaft is ensured.

[0034] In some embodiments, referring to Figure 1 The first gas bearing seat 300 is provided with a first flange 308 matched with the axial end surface of the first end of the body sleeve 100, the first flange 308 is located outside the body bore 103, the first flange 308 is assembled to the first end of the body sleeve 100 through a first fastener 309, and the first fastener 309 can be a screw, a bolt or the like. Similarly, the second gas bearing seat 400 is provided with a second flange 404 matched with the axial end surface of the second end of the body sleeve 100, the second flange 404 is located outside the body bore 103, the second flange 404 is assembled to the second end of the body sleeve 100 through a second fastener 405, and the second fastener can be a screw, a bolt or the like. In this embodiment, the first fastener 309 and the second fastener 405 are locked in the axial direction, so that the stator mounting seat 200, the first gas bearing seat 300 and the second gas bearing seat 400 can be integrally clamped in the body sleeve 100.

[0035] The first thrust bearing assembly 302 and the second thrust bearing assembly 401 are used for cooperating with the flying disc of the shaft core, so that a high-pressure gas film is also formed between the position of the flying disc and the thrust bearing assembly.

[0036] In some embodiments, referring to Figure 1The first thrust bearing assembly 302 and the second thrust bearing assembly 401 each comprise a first thrust bearing ring part 310, 406 and a second thrust bearing ring part 311, 407, the first thrust bearing ring part 310, 406 and the second thrust bearing ring part 311, 407 form flush axial thrust faces, and a throttle gap 312, 408 for jetting of thrust gas is formed between the first thrust bearing ring part 310, 406 and the second thrust bearing ring part 311, 407 at the axial thrust face, in the embodiment, the throttle gap for jetting of thrust gas is formed by the matching gap between the first thrust bearing ring part and the second thrust bearing ring part, the structure is simpler, it is not necessary to provide axial damping holes on the first thrust bearing assembly 302 and the second thrust bearing assembly 401, and the throttle gap can continuously extend in the circumferential direction, and better high-pressure gas film can be obtained.

[0037] The high-pressure air passes through the airflow channel of the machine body assembly, enters the damping plugs of the first radial air floating bearing 301 and the second radial air floating bearing 401, the damping plugs are micro-hole throttles, and the hole diameters are consistent, the high-pressure air diffuses to the four directions after passing through the micro-holes, so that a layer of high-pressure gas film is formed between the shaft core and the first radial air floating bearing 301 and the second radial air floating bearing 401, and a layer of high-pressure gas film is also formed between the flying disc position of the shaft core and the thrust bearing assembly, and the high-pressure gas films existing between the first radial air floating bearing 301, the second radial air floating bearing 401, the thrust bearing assembly and the shaft core support the shaft core to be contactlessly suspended, and ensure that the shaft core has certain load capacity and rigidity.

[0038] The embodiment of the utility model further provides an electric spindle, including shaft core 600 and the electric spindle machine body assembly in any one embodiment above, the shaft core 600 is supported in the electric spindle machine body assembly through the first radial air floating bearing 301 and the second radial air floating bearing 401, the shaft core 600 is equipped with the flying disc 601 that cooperates with the first thrust bearing assembly 302 and the second thrust bearing assembly 401, the stator mounting seat 200 is equipped with the stator 204, and the shaft core 600 is equipped with the rotor 602 that cooperates with the stator 204. The rotor 602 is fixed at the tail end of the shaft core 600, and the stator 204 forms a motor, for example, in some embodiments, the motor adopts a toothless slot permanent magnet synchronous motor, and the whole shaft core 600 is driven to rotate at high speed through the control of the driver.

[0039] In some embodiments, referring to Figure 1The electric spindle is provided with a cover plate 700 at the end of the electric spindle body assembly, and a small gap 701 is left between the cover plate 700 and the front end of the shaft core 600, gas in the system can flow to the outside through the gap, and the gap also plays a gas sealing role, prevents dust from entering the inside of the spindle during machining, prolongs the service life of the spindle, and can also blow away the workpiece surface residues, improving the surface machining effect.

[0040] Embodiments of the utility model also provide a machine tool, including the electric spindle in any one of above embodiment.

[0041] In the description of the present specification, the description of the terms "example", "embodiment" or "some embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] Of course, the present application is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An electrospindle body assembly, characterized by, The machine body cover, the stator mounting seat, the first gas bearing seat and the second gas bearing seat, the machine body cover is equipped with the machine body hole extending from the first end to the second end in the axial direction, the stator mounting seat is installed in the machine body hole by the first end of the machine body cover, the second gas bearing seat is installed in the machine body hole by the second end of the machine body cover, the first gas bearing seat is arranged in the machine body hole and is clamped between the stator mounting seat and the second gas bearing seat, the first gas bearing seat is equipped with the first radial gas bearing, the second gas bearing seat is equipped with the second radial gas bearing, the first gas bearing seat is equipped with the first thrust bearing assembly at one end close to the second gas bearing seat, and the second gas bearing seat is equipped with the second thrust bearing assembly at one end close to the first gas bearing seat.

2. The electrospindle body assembly according to claim 1, characterized in that, The stator mounting seat, the first gas bearing seat and the second gas bearing seat form the outer circumferential surface extending continuously in the axial direction inside the machine body hole, and the outer circumferential surface is attached to the inner wall of the machine body hole.

3. The electrospindle body assembly according to claim 2, characterized in that, The outer circumferential surface of the stator mounting seat, the first gas bearing seat and the second gas bearing seat is equipped with the cooling liquid groove extending continuously as a whole.

4. The electrospindle body assembly according to claim 3, characterized in that, The cooling liquid groove includes the spiral groove, the spiral groove includes the inlet cooling liquid groove and the return cooling liquid groove, the inlet cooling liquid groove extends from the first end to the second end of the machine body cover, the return cooling liquid groove extends from the second end to the first end of the machine body cover, the stator mounting seat is equipped with the cooling liquid inlet communicated with the inlet cooling liquid groove, and the stator mounting seat is equipped with the cooling liquid outlet communicated with the return cooling liquid groove.

5. The electric spindle body assembly of claim 1, wherein, The first end of the first gas bearing seat has the first boss extending in the axial direction, the first gas bearing seat is equipped with the first axial stepped surface outside the first boss, the stator mounting seat has the first sleeve part extending in the axial direction, the first sleeve part is sleeved on the first boss, the end of the first sleeve part abuts against the first axial stepped surface, the first gas bearing seat and the stator mounting seat are equipped with the first sealing ring, the second end of the first gas bearing seat has the second boss extending in the axial direction, the first gas bearing seat is equipped with the second axial stepped surface outside the second boss, the second gas bearing seat has the second sleeve part extending in the axial direction, the second sleeve part is sleeved on the second boss, and the end of the second sleeve part abuts against the second axial stepped surface.

6. The electric spindle body assembly of claim 1, wherein, The first gas bearing seat and the second gas bearing seat are equipped with the honeycomb-shaped axial heat dissipation hole.

7. The electric-spindle body assembly according to claim 1, characterized in that, The first gas bearing seat is equipped with the first flange flange matched with the axial end surface of the first end of the machine body cover, the first flange flange is assembled on the first end of the machine body cover through the first fastener, and the second gas bearing seat is equipped with the second flange flange matched with the axial end surface of the second end of the machine body cover.

8. The electric spindle body assembly of claim 1, wherein, The first and second thrust bearing assemblies each include a first thrust bearing ring member and a second thrust bearing ring member that form a flush axial thrust face between them with a restriction slot for ejection of a thrust gas flow at the axial thrust face.

9. An electric spindle, characterized by The electric spindle includes a shaft core supported by the first and second radial gas bearing assemblies, the shaft core being provided with a flying disc cooperating with the first and second thrust bearing assemblies, the stator mounting seat being provided with a stator, and the shaft core being provided with a rotor cooperating with the stator.

10. A machine tool, characterized by The electric spindle includes the electric spindle body assembly of any one of claims 1-8.

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