Main shaft and machine tool

Abstract

The utility model provides a main shaft which comprises a shaft sleeve, a first bearing seat and a motor, the shaft sleeve is located outside the motor, the first bearing seat is arranged at one end of the shaft sleeve in the axial direction of the main shaft, and the main shaft is further provided with a first cooling flow channel located on the periphery of the shaft sleeve and a second cooling flow channel located on the periphery of the shaft sleeve. And a second cooling flow channel, the second cooling flow channel and the first cooling flow channel are mutually independent, and the second cooling flow channel is located on a heat conduction path from the motor to the first bearing seat. The utility model further provides a machine tool. According to the main shaft provided by the technical scheme, the first bearing seat located at one end of the shaft sleeve can be efficiently cooled, and the cooling efficiency of the bearing connected with the first bearing seat is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of processing equipment, in particular to a main shaft and a machine tool. Background Art

[0002] The high-speed electric spindle is a main drive system for machine tools that eliminates pulley transmission and gear transmission and is directly driven by a built-in motor. This main drive system shortens the length of the machine tool main drive chain to zero, achieving "zero transmission" of the machine tool. The negative impact of high-speed motors is that they easily generate heat, resulting in a large temperature rise in the motor itself and the front / rear bearings. Existing technical solutions attempt to provide cooling channels in the front and rear bearings of the electric spindle in addition to retaining the cooling channels for cooling the motor position (for example, Chinese patent application 202311571778.3). However, the above technical solution still has a poor cooling effect on the front and rear bearings.

[0003] Therefore, how to design a more efficient cooling system that can efficiently cool at least one of the front bearing and the rear bearing is an urgent problem to be solved. Utility Model Content

[0004] The utility model provides a main shaft and a machine tool, which can efficiently dissipate heat for a first bearing seat located at one end of a shaft sleeve, thereby improving the heat dissipation efficiency of a bearing connected to the first bearing seat.

[0005] The utility model provides a main shaft, comprising a shaft sleeve, a first bearing seat and a motor, wherein the shaft sleeve is located outside the motor, the first bearing seat is arranged at one end of the shaft sleeve along the axial direction of the main shaft, and the main shaft is further provided with:

[0006] a first cooling channel located on an outer circumference of the sleeve; and

[0007] The second cooling channel is independent of the first cooling channel, and the second cooling channel is located on a heat conduction path from the motor to the first bearing seat.

[0008] In some feasible embodiments, the main shaft also has a first cooling member, which is located in the sleeve and connected to the first bearing seat. A cooling groove is provided on the outer periphery of the first cooling member and / or the inner periphery of the sleeve corresponding to the first cooling member, and the cooling groove and the inner wall of the sleeve form a second cooling channel.

[0009] In some feasible embodiments, the motor includes a stator and a rotor, the stator is located on the outer periphery of the rotor, and the stator and rotor are both located in a shaft sleeve; in the axial direction of the main shaft, the first cooling member is located between the stator and the first bearing seat.

[0010] In some feasible embodiments, a second mounting portion is provided on the side of the first bearing seat facing the sleeve, the second mounting portion extends from the inner wall of the sleeve toward the interior of the sleeve, a limiting portion is radially protruded on the inner wall of the sleeve, the limiting portion is spaced apart from the second mounting portion, and the first cooling member is axially located between the second mounting portion and the limiting portion.

[0011] In some feasible embodiments, a first mounting portion is further provided on the side of the first bearing seat facing the sleeve, and the first mounting portion is radially located on the outside of the second mounting portion; in the axial direction, the first mounting portion is closer to the end of the main shaft on the side where the first bearing seat is located than the second mounting portion, and the first mounting portion abuts against the sleeve.

[0012] In some feasible embodiments, the main shaft also includes a second bearing seat and a third cooling channel. The second bearing seat is axially arranged at the other end of the sleeve. The third cooling channel is also independent of the first cooling channel, and the third cooling channel is located on the heat conduction path from the motor to the second bearing seat.

[0013] In some feasible embodiments, the spindle further includes a second cooling member, and the second cooling member is provided with a third cooling channel;

[0014] The second bearing seat is radially arranged in the shaft sleeve, the second cooling member is located in the second bearing seat, and / or the motor is axially located between the first cooling member and the second cooling member.

[0015] In some feasible embodiments, the main shaft also includes a connecting piece, and the second bearing seat is axially fixed to the other end of the sleeve through the connecting piece. The connecting piece includes an outer peripheral portion and an inner peripheral portion. The sleeve is connected to the outer peripheral portion, and the second bearing seat is connected to the inner peripheral portion.

[0016] In some feasible embodiments, the second bearing seat is L-shaped, and the second bearing seat includes a bearing seat body and a protrusion, the protrusion is axially overlapped and fixedly connected to the inner circumference through a fastener, the outer ring of the bearing seat body is radially fitted with the inner circumference, and the inner ring of the bearing seat body is provided with a receiving groove, and the receiving groove is used to accommodate the second cooling member.

[0017] The utility model also provides a machine tool, comprising the above-mentioned main shaft.

[0018] The above-mentioned main shaft includes a sleeve, a first bearing seat and a motor, the sleeve is located outside the motor, and the first bearing seat is arranged at one end of the sleeve along the axial direction of the main shaft. It is characterized in that the main shaft is also provided with: a first cooling channel, the first cooling channel is located on the outer periphery of the sleeve; and a second cooling channel, the second cooling channel is independent of the first cooling channel, and the second cooling channel is located on the heat conduction path from the motor to the first bearing seat, and the first bearing seat located at one end of the sleeve is efficiently dissipated through the second cooling channel, thereby improving the heat dissipation efficiency of the first bearing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive efforts.

[0020] Figure 1 A schematic diagram of a main shaft provided in one embodiment of the present utility model.

[0021] Figure 2 This is an exploded schematic diagram of a shaft sleeve of a main shaft provided in one embodiment of the utility model.

[0022] Figure 3 for Figure 1 sectional view of .

[0023] Figure 4 for Figure 3 Schematic diagram of the first bearing seat.

[0024] Figure 5 for Figure 3 Schematic diagram of the second bearing seat.

[0025] Component Symbol Description

[0026] 100, sleeve; L1, first cooling channel; 110, sleeve body; 120, cylinder; 101, limiting portion; 200, first bearing seat; 210, first mounting portion; 220, second mounting portion; 300, first cooling member; L2, second cooling channel; 301, cooling groove; 400, second bearing seat; 401, receiving groove; 410, body; 402, first holding portion; 403, second holding portion; 420, protrusion; 500, second cooling member; L3, third cooling channel; 600, stator; 700, rotor; 800, connecting member; 810, outer periphery; 820, inner periphery; 1000, core shaft; 1100, first bearing; 1200, second bearing.

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0030] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0031] To provide a clearer and more accurate understanding of the present invention, the following detailed description is provided with reference to the accompanying drawings. The accompanying drawings illustrate exemplary embodiments of the present invention, with like reference numerals representing like elements. It should be understood that the scales shown in the accompanying drawings are not those of the actual implementation of the present invention. These scales are for illustrative purposes only and are not drawn to scale.

[0032] Please see Figure 1 and Figure 2 Some embodiments of the first aspect of the present invention provide a main shaft. The main shaft includes a sleeve 100, a first bearing seat 200 and a motor. Figure 1 As shown, the sleeve 100 is used for installing the first bearing seat 200, and the first bearing seat 200 is arranged at one end of the sleeve 100 along the axial direction of the main shaft.

[0033] Specifically, the sleeve 100 is cylindrical, which can increase the accommodation space inside the sleeve 100 and enable the sleeve 100 to accommodate more components.

[0034] Please continue to see Figure 1 and Figure 2 The sleeve 100 is located outside the motor, and the main shaft is also provided with a first cooling channel L1 and a second cooling channel L2. The first cooling channel L1 is located on the outer periphery of the sleeve 100, and the second cooling channel L2 is independent of the first cooling channel L1. The second cooling channel L2 is located on the heat conduction path from the motor to the first bearing seat 200.

[0035] Although the traditional spindle unit also takes into account the cooling of the front bearing / rear bearing in addition to the motor, the cooling channel for the front bearing / rear bearing is connected to the cooling channel for the motor, or the coolant cools the front bearing / rear bearing after cooling the bushing, so the temperature of the coolant has increased significantly when it flows to the front bearing / rear bearing, so the cooling effect on the front bearing / rear bearing is unsatisfactory.

[0036] To this end, the spindle in the first embodiment of the present invention is designed to have the second cooling channel L2 independent of the first cooling channel L1, so that the spindle does not use the coolant already used to cool the motor to cool the front / rear bearing parts, thereby increasing the temperature difference between the coolant and the front / rear bearing components to ensure cooling efficiency. The second cooling channel L2 is located on the heat conduction path from the motor to the first bearing seat 200. Before the heat generated by the motor is conducted to the first bearing seat 200, the coolant in the second cooling channel L2 first cools the first bearing seat 200 and removes a large amount of heat, thereby improving the cooling effect on the front / rear bearing components.

[0037] It is not difficult to understand that the first cooling channel L1, the second cooling channel L2 and the third cooling channel L3 to be mentioned below in the embodiment of the present application can use special cooling elements to provide channels for the flow of coolant, or can use multiple existing other elements or special cooling elements and existing elements to jointly enclose and define a space for the flow of coolant as a channel.

[0038] Please see Figure 3 and Figure 4, the first cooling member 300 is provided with a second cooling channel L2 which is independent of the first cooling channel L1. Specifically, the input port of the first cooling channel L1 is connected to the coolant source, and the input port of the second cooling channel L2 is also connected to the same coolant source, so that the first cooling channel L1 and the second cooling channel L2 each have a corresponding input port. The coolant in the second cooling channel L2 is discharged to the coolant recovery tank through the output port, so that the sleeve 100 and the first cooling member 300 can both be connected to the coolant source, so that the temperature of the coolant entering the first cooling channel L1 and the second cooling channel L2 is the initial temperature, thereby improving the cooling efficiency of the sleeve 100 and the first bearing seat 200. It can be understood that the first cooling channel L1 and the second cooling channel L2 can also be provided with a coolant source.

[0039] The first cooling channel L1 is mainly used to cool the source of heat generation, namely the motor. Figures 1 to 4 In order to facilitate the formation of the first cooling channel L1, in some embodiments, the sleeve 100 includes a sleeve 110 and a cylinder 120 sleeved on the outer periphery of the sleeve 110, and a first cooling channel L1 is provided between the sleeve 110 and the cylinder 120. The first cooling channel L1 can be spiral. For example, a cooling channel is provided on the outer peripheral wall of the sleeve 110 and / or on the inner peripheral wall of the cylinder 120. When a larger coolant flow rate is required, cooling channels can be provided on both the outer peripheral wall of the sleeve 110 and the inner peripheral wall of the cylinder 120, so that the cross-sectional size of the cooling channel is the largest, more coolant can flow per unit time, and the cooling efficiency of the sleeve 100 is improved.

[0040] Please see Figure 3 and Figure 4 To facilitate heat dissipation from the first bearing seat 200, it is positioned at one end of the sleeve 100 along the main shaft's axial direction. The sleeve 100 maximizes contact area with components located within the sleeve 100 and close to the inner circumferential wall, resulting in optimal heat dissipation. However, the sleeve 100's cooling effect on the first bearing seat 200 at one end of the sleeve 100 and the second bearing seat 400 at the other end is moderate.

[0041] In some embodiments, the spindle further comprises a first cooling member 300, which is located within the sleeve 100 and is connected to the first bearing seat 200. The first cooling member 300 cools the first bearing seat 200 and is located near one end of the sleeve 100. The first cooling member 300 is connected to the first bearing seat 200 to facilitate heat conduction between the first cooling member 300 and the first bearing seat 200. This allows the first cooling member 300 to remove heat generated by the first bearing seat 200 and the bearings mounted therein, thereby maintaining the bearings within the first bearing seat 200 at a suitable temperature, reducing the possibility of deformation of the bearings within the first bearing seat 200 due to high temperatures, and improving machining accuracy even when the spindle rotates at high speed for extended periods of time.

[0042] Please see Figure 4 In order to facilitate the formation of the second cooling channel L2 between the first cooling member 300 and the sleeve 100 and to facilitate the reduction of the temperature of the first cooling member 300 itself, a cooling groove 301 is provided on the outer periphery of the first cooling member 300 and / or the inner periphery of the sleeve 100 corresponding to the first cooling member 300. For example, a cooling groove 301 is provided on the outer periphery of the first cooling member 300 and / or the sleeve body 110 corresponding to the inner periphery of the first cooling member 300, thereby facilitating the processing of the cooling groove 301. The cooling groove 301 and the inner wall of the sleeve 100 enclose the second cooling channel L2. The cooling groove 301 is spiral-shaped, which can increase the total length of the cooling groove 301, thereby allowing the cooling groove 301 to accommodate more coolant and improve the cooling effect of the second cooling channel L2.

[0043] See also Figure 3 as well as Figure 4 In some embodiments, the motor includes a stator 600 and a rotor 700, the stator 600 is located on the outer periphery of the rotor 700, and both the stator 600 and the rotor 700 are located in the sleeve 100. In the axial direction of the main shaft, the first cooling member 300 is located between the stator 600 and the first bearing seat 200. In other words, when viewed along the axial direction of the main shaft, the first cooling member 300 is located between the stator 600 and the first bearing seat 200. When heat is conducted outward from the motor through the shaft core along the axial direction of the main shaft, it needs to pass through the first cooling member 300 before reaching the position of the first bearing seat 200. At this time, the cooling liquid flowing in the second cooling channel L2 can take away a large amount of heat before the heat is transferred to the first bearing seat 200.

[0044] Please see Figure 4In some embodiments, to ensure that the sleeve 100 maintains a sealing effect after the first bearing seat 200 is installed, and to prevent external dust and cutting fluid from entering the first bearing seat 200, a second mounting portion 220 is provided on the side of the first bearing seat 200 facing the sleeve 100. The second mounting portion 220 extends from the inner wall of the sleeve 100 toward the interior of the sleeve 100. A limiting portion 101 is radially protruded from the inner wall of the sleeve 100. The limiting portion 101 is spaced apart from the second mounting portion 220. The first cooling member 300 is axially located between the second mounting portion 220 and the limiting portion 101. The first cooling member 300 is axially located between the second mounting portion 220 and the limiting portion 101, thereby providing installation space for the first cooling member 300.

[0045] Specifically, a stopper 101 is protruded from the inner wall of the sleeve 110. The first cooling member 300 is annular, and the cooling groove 301 is provided only on the outer periphery of the first cooling member 300. This ensures that the first cooling member 300 is provided with a sufficiently long cooling groove 301 without reducing the thickness of the peripheral wall of the sleeve 100, thereby ensuring the rigidity of the sleeve 100. The cooling groove 301 can be spiral in shape to facilitate securing the first cooling member 300 to the sleeve 100.

[0046] Furthermore, in some embodiments, a first mounting portion 210 is further provided on the side of the first bearing seat 200 facing the sleeve 100, and the first mounting portion 210 is radially located on the outside of the second mounting portion 220; in the axial direction of the main shaft, the first mounting portion 210 is closer to the end of the main shaft on the side where the first bearing seat 200 is located than the second mounting portion 220, and the first mounting portion 210 abuts against the sleeve 100. An accommodating space for accommodating the first bearing 1100 is provided on the inner side of the end of the first mounting portion 210 facing away from the first cooling member 300. Figure 4 As shown, the first mounting portion 210 is closer to the end of the main shaft on the side where the first bearing seat 200 is located than the second mounting portion 220. This makes the sleeve body 110 of the sleeve 100 longer than the cooling groove 301 in the axial direction of the main shaft. As a result, the cooling groove 301 is completely enclosed by the sleeve body 110 along its length. The second cooling channel L2 is effectively enclosed, reducing the possibility of coolant leakage.

[0047] Please see Figure 3 and 5In some embodiments, to facilitate cooling of the second bearing seat 400 located at the other end of the sleeve 100, the main shaft further includes a second bearing seat 400 and a third cooling channel L3. The second bearing seat 400 is axially disposed at the other end of the sleeve 100. The third cooling channel L3 is also independent of the first cooling channel L1 and is located on the heat conduction path from the motor to the second bearing seat 400. Similarly, before the heat generated by the motor is transferred to the second bearing seat 400, the coolant in the third cooling channel L3 first cools the second bearing seat 400, removing a large amount of heat, thereby improving the cooling effect on the related bearing components on the second bearing seat 400.

[0048] Furthermore, in some embodiments, the second cooling member 500 is connected to the second bearing seat 400 to enable heat conduction between the second cooling member 500 and the second bearing seat 400 .

[0049] Please see Figure 3 In some embodiments, in order to prevent the heat generated by the motor from being quickly transferred to the first bearing 1100 or the second bearing 1200, thereby preventing the first bearing 1100 or the second bearing 1200 from being thermally deformed due to excessive heat and affecting the precision of the spindle, the spindle further includes a core shaft 1000, and the core shaft 1000 and the motor are both disposed within the sleeve 100. The motor is disposed between the core shaft 1000 and the sleeve 100, and is transmission-connected to the core shaft 100. The first cooling member 300 is axially disposed between the motor and the first bearing seat 200, and the second cooling member 500 is axially disposed between the motor and the second bearing seat 400 or between the two bearings within the second bearing seat 400.

[0050] In some embodiments, the main shaft further includes a second cooling member 500 , and a third cooling channel L3 is provided on the second cooling member 500 .

[0051] Further, see Figure 3 and 5 The second bearing seat 400 is radially arranged inside the shaft sleeve 100, and the second cooling member 500 is located inside the second bearing seat 400. Specifically, a first clamping portion 402 and a second clamping portion 403 are respectively provided at both ends of the inner wall of the second bearing seat 400 along the axial direction. The first clamping portion 402 and the second clamping portion 403 are used to accommodate two second bearings 1200 and a second cooling member 500. The second cooling member 500 is located between the two second bearings 1200, thereby facilitating the installation of the second cooling member 500 and the two second bearings 1200.

[0052] like Figure 3As shown, the motor includes a stator 600 and a rotor 700. It can be understood that the stator 600 is located on the outer periphery of the rotor 700, and both the stator 600 and the rotor 700 are located in the sleeve 100. In the axial direction of the main shaft, the first cooling member 300 is located between the stator 600 and the first bearing seat 200. The main shaft can be an electric main shaft, and the first bearing seat 200 and the second bearing seat 400 in the electric main shaft generate more heat, so the first cooling member 300 is more needed to cool the first bearing seat 200, and the second cooling member 500 is more needed to cool the second bearing seat 400. The stator 600 can rotate relative to the stator 600, the sleeve 100, the first cooling member 300 and the second cooling member 500.

[0053] Furthermore, in some embodiments, the stator 600 and the rotor 700 are axially located between the first cooling member 300 and the second cooling member 500 .

[0054] Please see Figure 5 In some embodiments, to facilitate the installation of the second bearing seat 400 on the sleeve 100, the main shaft further includes a connector 800. The second bearing seat 400 is axially fixed to the other end of the sleeve 100 via the connector 800. The connector 800 includes an outer peripheral portion 810 and an inner peripheral portion 820. The sleeve 100 is connected to the outer peripheral portion 810, and the second bearing seat 400 is connected to the inner peripheral portion 820. The provision of the connector 800 allows the second bearing seat 400 to be radially disposed deeper within the sleeve 100, while ensuring the connection strength between the second bearing seat 400 and the sleeve 100. Specifically, the second bearing seat 400 and the inner peripheral portion 820 are axially stacked, with the outer peripheral portion 810 being annular and the inner peripheral portion 820 also being annular.

[0055] Furthermore, in some embodiments, the second bearing seat 400 is L-shaped, including a bearing seat body 410 and a protrusion 420, and the protrusion 420 is axially overlapped and fixedly connected to the inner circumference 820 through a fastener. By providing the protrusion 420, the second bearing seat 400 can be better fixedly connected to the connecting member 800. The bearing seat body 410 is used to accommodate two second bearings 1200 and a second cooling member 500. The outer ring of the bearing seat body 410 is radially fitted with the inner circumference 820, and the inner ring of the bearing seat body 410 is provided with a receiving groove 401, and the receiving groove 401 is used to accommodate the second cooling member 500. As Figure 5 As shown, the bearing seat body 410 is annular, and the protrusion 420 is also annular.

[0056] Please see Figure 5In some embodiments, to improve the cooling efficiency of the second bearing seat 400, the main shaft further includes a second bearing seat 400 and a third cooling channel L3. The second bearing seat 400 is axially disposed at the other end of the sleeve 100. The third cooling channel L3 is also independent of the first cooling channel L1 and is located on the heat conduction path from the motor to the second bearing seat 400. Similarly, before the heat generated by the motor is transferred to the second bearing seat 400, the coolant in the third cooling channel L3 first cools the second bearing seat 400, removing a large amount of heat, thereby improving the cooling effect on the related bearing components on the second bearing seat 400.

[0057] Furthermore, in some embodiments, the main shaft further includes a second cooling member 500, which is provided with a third cooling channel L3. The second bearing seat 400 is radially disposed within the sleeve 100, with the second cooling member 500 located within the second bearing seat 400. Furthermore, the motor is axially located between the first cooling member 300 and the second cooling member 500. The sleeve 100 is provided with a first cooling channel L1 on its outer periphery. The third cooling channel L3 is independent of the first cooling channel L1, allowing the third cooling channel L3 to be connected in parallel with the first cooling channel L1. The initial temperature of the coolant flowing into the third cooling channel L3 and the first cooling channel L1 is the same, ensuring that the second cooling member 500 effectively cools the second bearing seat 400.

[0058] Some embodiments of the second aspect of the present invention further provide a machine tool. The machine tool includes the above-mentioned spindle. It is not difficult to understand that the machine tool can be a vertical machine tool, a horizontal machine tool, or a lathe.

[0059] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

[0060] The above examples are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. A main shaft, comprising a sleeve (100), a first bearing seat (200) and a motor, wherein the sleeve (100) is located outside the motor, and the first bearing seat (200) is arranged at one end of the sleeve (100) along the axial direction of the main shaft, characterized in that: The main shaft is also provided with: a first cooling channel (L1), the first cooling channel (L1) being located on the outer periphery of the sleeve (100); and A second cooling channel (L2), the second cooling channel (L2) and the first cooling channel (L1) are independent of each other, and the second cooling channel (L2) is located on a heat conduction path from the motor to the first bearing seat (200).

2. The spindle according to claim 1, wherein: The main shaft also has a first cooling member (300), the first cooling member (300) is located in the sleeve (100), the first cooling member (300) is connected to the first bearing seat (200), the outer periphery of the first cooling member (300) and / or the sleeve (100) are provided with a cooling groove (301) corresponding to the inner periphery of the first cooling member (300), and the cooling groove (301) and the inner wall of the sleeve (100) are enclosed to form a second cooling channel (L2).

3. The spindle according to claim 2, wherein: The motor comprises a stator (600) and a rotor (700), wherein the stator (600) is located on the outer periphery of the rotor (700), and both the stator (600) and the rotor (700) are located in a shaft sleeve (100); in the axial direction of the main shaft, the first cooling member (300) is located between the stator (600) and the first bearing seat (200).

4. The spindle according to claim 2, wherein: A second mounting portion (220) is provided on the side of the first bearing seat (200) facing the sleeve (100), and the second mounting portion (220) extends from the inner wall of the sleeve (100) toward the interior of the sleeve (100). A limiting portion (101) is provided on the inner wall of the sleeve (100) along the radial direction, and the limiting portion (101) is spaced apart from the second mounting portion (220). The first cooling member (300) is axially located between the second mounting portion (220) and the limiting portion (101).

5. The spindle according to claim 4, wherein: A first mounting portion (210) is further provided on the side of the first bearing seat (200) facing the shaft sleeve (100), and the first mounting portion (210) is radially located outside the second mounting portion (220); in the axial direction of the main shaft, the first mounting portion (210) is closer to the end of the main shaft on the side where the first bearing seat (200) is located than the second mounting portion (220), and the first mounting portion (210) abuts against the shaft sleeve (100).

6. The spindle according to any one of claims 1 to 5, characterized in that: The main shaft further includes a second bearing seat (400) and a third cooling channel (L3). The second bearing seat (400) is axially arranged at the other end of the sleeve (100). The third cooling channel (L3) is also independent of the first cooling channel (L1), and the third cooling channel (L3) is located on a heat conduction path from the motor to the second bearing seat (400).

7. The spindle according to claim 6, wherein: The main shaft further comprises a second cooling member (500), and the second cooling member (500) is provided with a third cooling channel (L3); The second bearing seat (400) is radially arranged in the sleeve (100), the second cooling member (500) is located in the second bearing seat (400), and / or the motor is axially located between the first cooling member (300) and the second cooling member (500).

8. The spindle according to claim 7, wherein: The main shaft also includes a connecting piece (800), and the second bearing seat (400) is fixed to the other end of the sleeve (100) in the axial direction through the connecting piece (800), and the connecting piece (800) includes an outer peripheral portion (810) and an inner peripheral portion (820), the sleeve (100) is connected to the outer peripheral portion (810), and the second bearing seat (400) is connected to the inner peripheral portion (820).

9. The spindle according to claim 8, wherein: The second bearing seat (400) is L-shaped, and the second bearing seat (400) includes a bearing seat body (410) and a protrusion (420), the protrusion (420) is axially overlapped and fixedly connected with the inner circumference (820) through a fastener, the outer ring of the bearing seat body (410) is radially fitted with the inner circumference (820), and the inner ring of the bearing seat body (410) is provided with a receiving groove (401), and the receiving groove (401) is used to accommodate the second cooling member (500).

10. A machine tool, characterized in that: Comprising the main shaft according to any one of claims 1-9.

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