CN112049866A

CN112049866A - Bearing seat and electric spindle

Info

Publication number: CN112049866A
Application number: CN202010885738.6A
Authority: CN
Inventors: 邵启鹏; 耿继青; 何圳涛; 刘永连; 王攀
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2020-12-08

Abstract

The application relates to the technical field of machine tools in general, and particularly relates to a bearing seat and an electric main shaft, wherein a first oil inlet oil way is communicated to a first bearing mounting position of the bearing seat, a second oil inlet oil way is communicated to a second bearing mounting position of the bearing seat, oil return oil ways are respectively communicated to the first bearing mounting position and the second bearing mounting position, so that the backward flow of lubricating oil, design independent lubrication runner respectively to first bearing and second bearing, guarantee the accuracy of lubrication parameter, reduce the heat that produces in the bearing course of operation, the life of bearing has been improved, the cooling runner is including being located the inside first runner of bearing frame and seting up the second runner in the bearing frame periphery side, first runner and second runner intercommunication, the current structure that is used for forming the cooling runner has been cancelled, set up the cooling runner in the bearing frame, reduce the occupation of space, the external diameter size of electric main shaft front end has been reduced.

Description

Bearing seat and electric spindle

Technical Field

The application relates to the technical field of machine tools in general, and particularly relates to a bearing seat and an electric spindle.

Background

The electric main shaft has a transmission structure mode of 'combining two-in-one' of a built-in motor and a machine tool main shaft, a bearing is the core of the electric main shaft and a rotary supporting part thereof, lubrication and cooling of the electric main shaft play a vital role in the rotary precision, the processing quality and the service life of the main shaft, oil-gas lubrication is to mix lubricating oil and compressed air, the lubricating oil is sent to an oil nozzle through an oil conveying pipe and is sprayed out to the bearing from the oil nozzle, most of electric main shaft bearing cooling flow passage structures axially or radially flow in from the rear end of a main shaft sleeve, so that the wall thickness of the whole sleeve is increased, the wall thickness of a bearing seat connected with the sleeve at the front end of the main shaft is reduced, and the sleeve with the increased wall thickness not only occupies the.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to solve at least one of the above technical problems, a main object of the present application is to provide a bearing housing and an electric spindle.

In order to achieve the purpose of the invention, the following technical scheme is adopted in the application:

a bearing block is arranged on an electric main shaft, and is provided with a first oil inlet channel, a second oil inlet channel, an oil return channel and a cooling flow channel;

the first oil inlet oil path is communicated to a first bearing mounting position of the bearing seat, the second oil inlet oil path is communicated to a second bearing mounting position of the bearing seat, and the oil return oil path is respectively communicated to the first bearing mounting position and the second bearing mounting position so as to facilitate the backflow of lubricating oil;

the cooling flow channel comprises a liquid inlet flow channel, a liquid outlet flow channel and a heat exchange flow channel arranged on the periphery side of the bearing seat, and the liquid inlet flow channel and the liquid outlet flow channel are respectively communicated with the heat exchange flow channel.

Further, in some embodiments of the present disclosure, the first oil inlet passage includes a first oil inlet section, a second oil inlet section, and a third oil inlet section that are sequentially communicated;

the first oil inlet section and the third oil inlet section are arranged along the radial extension of the bearing seat, the second oil inlet section is arranged along the axial extension of the bearing seat, and the oil outlet end of the third oil inlet section faces to the first bearing installation position.

Further, in some embodiments of the present disclosure, the bearing seat is provided with a first oil injection plug extending radially, the third oil inlet section is located in the first oil injection plug, and the first oil injection plug is provided with a first oil injection hole communicated with the third oil inlet section.

Further, in some embodiments of the present disclosure, a positioning element is disposed at an outer end of the first oil plug, and a mounting groove for fitting with the positioning element is disposed in the second flow channel on the circumferential side of the bearing seat.

Further, in some embodiments of this scheme, above-mentioned second oil feed oil circuit includes fourth oil feed section, fifth oil feed section and the sixth oil feed section that communicates in proper order, the fourth oil feed section with the sixth oil feed section is followed the radial extension setting of bearing frame, the fifth oil feed section is followed the axial extension of bearing frame, the oil outlet end orientation of sixth oil feed section the second bearing installation department.

Further, in some embodiments of the present disclosure, a second oil injection plug is installed on the bearing seat, the sixth oil inlet section is located in the second oil injection plug, and the second oil injection plug is provided with a second oil injection hole communicated with the sixth oil inlet section.

Further, in some embodiments of the present disclosure, the heat exchange flow channel includes a plurality of annular grooves formed along a circumferential direction of the bearing block, and a notch is formed between two adjacent annular grooves, so as to facilitate circulation of a cooling liquid.

Further, in some embodiments of the present disclosure, the bearing seat is provided with a first oil return groove, a second oil return groove, and a third oil return groove, which are used for communicating with the oil return path;

the first oil return groove is used for returning oil at the installation position of the first bearing, and the second oil return groove and the third oil return groove are respectively positioned at two opposite sides of the installation position of the second bearing and used for returning oil at the installation position of the second bearing.

An electric spindle is provided with the bearing seat.

Further, in some embodiments of the present disclosure, the electric spindle includes a rotating shaft, and a first bearing, a second bearing and a sealing element respectively sleeved on the rotating shaft;

the sealing member is located the front end department of bearing frame, just the sealing member orientation one side of first bearing is followed the circumference of pivot is extended and is provided with the arc concave surface, with the sealing member with form the oil pocket that converges between the first bearing, the radial direction of sealing member seted up respectively with converge the oil pocket and the oil return hole of oil return circuit intercommunication.

Further, in some embodiments of the present disclosure, the sealing element includes a first sealing portion and a second sealing portion detachably mounted on the first sealing portion, and the arc-shaped concave surface is opened on the second sealing portion.

Further, in some embodiments of the present disclosure, the electric spindle further includes a rotor stator assembly, a cooling jacket, and a spindle sleeve, the spindle sleeve is sleeved on an outer side of the rotor stator assembly, and the cooling jacket is disposed between the rotor stator assembly and the spindle sleeve.

Further, in some embodiments of the present disclosure, a first flow passage is formed in a side of the spindle sleeve facing the bearing seat, and the first flow passage is communicated with the cooling flow passage;

a second flow passage is formed in a gap between the cooling sleeve and the main shaft sleeve and is communicated with the first flow passage;

and a third flow channel is formed in one side, far away from the bearing seat, of the spindle sleeve and communicated with the second flow channel, and liquid outlets are formed in the third flow channel towards the radial direction and the axial direction of the spindle sleeve respectively.

According to the technical scheme, the bearing seat and the electric spindle have the advantages and positive effects that:

the bearing seat is provided with a first oil inlet oil way, a second oil inlet oil way, an oil return oil way and a cooling flow passage, the first oil inlet oil way is communicated to a first bearing mounting position of the bearing seat, the second oil inlet oil way is communicated to a second bearing mounting position of the bearing seat, the oil return oil way is respectively communicated to the first bearing mounting position and the second bearing mounting position, so that the backward flow of lubricating oil, design independent lubrication runner respectively to first bearing and second bearing, guarantee the accuracy of lubrication parameter, reduce the heat that produces in the bearing course of operation, the life of bearing has been improved, the cooling runner is including being located the inside first runner of bearing frame and seting up the second runner in the bearing frame periphery side, first runner and second runner intercommunication, the current structure that forms the cooling runner has been cancelled, set up the cooling runner in the bearing frame, reduce the occupation of space, the external diameter size of electric main shaft front end has been reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic perspective view of a bearing housing according to an exemplary embodiment.

Fig. 2 is a schematic perspective view illustrating a first oil plug (second oil plug) of a bearing housing according to an exemplary embodiment.

Fig. 3 is a schematic cross-sectional view of a first oil plug (second oil plug) of a bearing housing according to an exemplary embodiment.

Fig. 4 is a schematic diagram illustrating a first oil inlet path structure of an electric spindle according to an exemplary embodiment.

Fig. 5 is a structural schematic diagram of a second oil inlet passage of the electric spindle according to an exemplary embodiment.

Fig. 6 is a schematic diagram illustrating an oil return path structure of an electric spindle according to an exemplary embodiment.

FIG. 7 is a schematic diagram illustrating a cooling flow path of an electric spindle according to an exemplary embodiment.

Fig. 8 is a schematic diagram illustrating a second seal portion of an electric spindle according to an exemplary embodiment.

Wherein the reference numerals are as follows:

100-a rotating shaft; 200-dust cap; 300-a bearing seat; 400-a rotor-stator assembly; 500-a seal; 600-a first bearing; 700-a second bearing; 800-bearing spacer ring; 900-a housing; 1000-cooling jacket; 1100-a spindle sleeve; 1200-front gland; 1300-rear end press cover; 1400-oil collecting spacer ring;

310-first oil inlet circuit; 320-a second oil inlet path; 330-oil return path; 340-a cooling flow channel; 350-a first oil spray plug; 360-a second oil spray plug; 370-a mounting groove;

311-a first oil inlet section; 312-a second oil intake section; 313-a third oil inlet section;

321-a fourth oil inlet section; 322-fifth oil intake section; 323-a sixth oil intake section;

341-liquid inlet flow channel; 342-a liquid outlet flow passage; 343-heat exchange flow channel;

343' 1-ring groove; 343' 2-notch;

351-a positioning member; 352-first injector hole;

381-a first oil return tank; 382-a second oil return groove; 383-a third oil return tank;

510-oil collecting cavity; 520-oil return hole; 530-a first seal; 540-a second seal;

541-an arc concave surface;

810-a first flow guiding hole; 820-a second diversion hole;

910-a first flow channel; 920-a second flow channel; 930-third flow path.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The scheme provides a bearing seat and an electric spindle, the bearing seat 300 is installed on a motor spindle, the bearing seat 300 can be matched with two bearings at the same time, the bearing seat 300 is provided with a first oil inlet oil path 310, a second oil inlet oil path 320, an oil return oil path 330 and a cooling flow path 340, the first oil inlet oil path 310 is communicated with a first bearing installation position of the bearing seat 300, the second oil inlet oil path 320 is communicated with a second bearing installation position of the bearing seat 300, the oil return oil path 330 is respectively communicated with the first bearing installation position and the second bearing installation position, the bearing seat 300 is respectively provided with independent lubricating flow paths aiming at the first bearing installation position and the second bearing installation position, the accuracy of lubricating parameters of the two bearings is ensured, the heat generated in the working process of the bearings is effectively reduced, the service lives of the bearings are prolonged, the cooling flow path 340 comprises a first flow path 910 positioned inside, the first flow passage 910 is communicated with the second flow passage 920, and after the bearing seat 300 in the scheme is installed on the motor spindle, the existing structural part for forming the cooling flow passage 340 can be eliminated, so that the occupied space is reduced, and the outer diameter size of the front end of the motor spindle is reduced.

As shown in fig. 1 to 4, in this scheme, a first oil inlet path 310, a second oil inlet path 320, and an oil return path 330 are respectively disposed inside a bearing seat 300, the first oil inlet path 310 includes a first oil inlet section 311, a second oil inlet section 312, and a third oil inlet section 313 that are sequentially communicated, the first oil inlet section 311 and the third oil inlet section 313 extend along a radial direction of the bearing seat 300, an oil inlet of the first oil inlet section 311 is located on a peripheral side of a tail end of the bearing seat 300, the second oil inlet section 312 extends along an axial direction of the bearing seat 300, the bearing seat 300 is mounted with a first oil injection plug 350 that extends along the radial direction, the third oil inlet section 313 is located in the first oil injection plug 350, the first oil injection plug 350 is provided with a first oil injection hole 352 that is communicated with the third oil inlet section 313, and the first oil injection hole 352 faces a first bearing mounting location. As shown in fig. 5, the second oil inlet path 320 includes a fourth oil inlet section 321, a fifth oil inlet section 322, and a sixth oil inlet section 323, which are sequentially communicated, the fourth oil inlet section 321 and the sixth oil inlet section 323 are disposed along a radial extension of the bearing block 300, the fifth oil inlet section 322 extends along an axial direction of the bearing block 300, the bearing block 300 is mounted with a second oil injection plug 360 extending in the radial direction, the sixth oil inlet section 323 is located in the second oil injection plug 360, and the second oil injection plug 360 is provided with a second oil injection hole communicated with the sixth oil inlet section 323. As shown in fig. 1, the first oil spout plug 350 and the second oil spout plug 360 respectively extend from the radial direction of the bearing seat 300, in this solution, the first oil spout plug 350 has the same structure as the second oil spout plug 360, and the installation method is the same, therefore, only the structure introduction is performed on the first oil spout plug 350, referring to fig. 2-3, the outer end of the first oil spout plug 350 is provided with the positioning member 351, the outer end of the first oil spout plug 350 is the end located outside the bearing seat 300, the second flow channel 920 on the peripheral side of the bearing seat 300 is provided with the installation groove 370 for matching with the positioning member 351, the installation stability of the oil spout plug is ensured, and meanwhile, the problem that the oil-gas flow channel is arranged inside the cooling flow channel 340 is avoided. On the basis of the structure, a person skilled in the art can realize that the first oil spray plug 350 and the second oil spray plug 360 are respectively and fixedly connected with the bearing seat 300 in a threaded connection mode, and the positioning piece 351 is provided with a threaded hole, so that the design of the first oil spray plug 350 and the second oil spray plug 360 ensures the smoothness of an oil-gas channel, and the processing difficulty of the bearing seat 300 is reduced.

Referring to fig. 6, the oil return path 330 includes an extending arrangement along the radial direction of the bearing seat 300, a first oil return groove 381 is disposed on the inner wall surface of the bearing seat 300 near the first bearing installation location, a second oil return groove 382 and a third oil return groove 383 are respectively disposed on two axial sides of the second bearing installation location of the bearing seat 300, the first oil return groove 381, the second oil return groove 382 and the third oil return groove 383 are respectively communicated with the oil return path 330, so as to return oil at the first bearing installation location and the second bearing installation location, in this embodiment, the oil return path 330 includes a second oil return section which is radially extended and provided with a first oil return section and circumferentially extended, and an outlet section of the first oil return section is located on the periphery side of the bottom of the.

As shown in fig. 7, in this embodiment, the bearing housing 300 is further provided with a cooling flow channel 340, the cooling flow channel 340 includes a liquid inlet flow channel 341, a liquid outlet flow channel 342, and a heat exchange flow channel 343, as shown in fig. 1, the heat exchange flow channel 343 includes a plurality of annular grooves 343 '1 formed along the circumferential direction of the bearing housing 300, and a notch 343' 2 is formed between two adjacent annular grooves 343 '1, so as to facilitate the circulation of the cooling liquid, when the bearing housing is installed, the bearing housing 300 is installed with a hollow cylindrical housing 900, the inner wall of the housing 900 is in sealing fit with the bearing housing 300, and the annular grooves 343' 1 and the inner wall of the housing 900 form the heat exchange flow channel 343. The liquid inlet of the liquid inlet flow channel 341 is located on the periphery of the bottom of the bearing seat 300, the liquid outlet of the liquid outlet flow channel 342 is located on the end surface of the bottom of the bearing seat 300 so as to be communicated with the flow channel in the spindle sleeve 1100 of the electric spindle, the liquid inlet flow channel 341 is communicated with the annular groove 343 '1 close to the front end of the bearing seat 300, and the liquid outlet flow channel 342 is communicated with the annular groove 343' 1 close to the tail end of the bearing seat 300.

The present embodiment further provides an electric spindle, which is equipped with the bearing seat 300, and with reference to fig. 4 to 7, the electric spindle includes a rotating shaft 100, a dust cap 200, a rotor-stator assembly 400, a sealing member 500, a first bearing 600, a second bearing 700, a bearing spacer ring 800, a housing 900, a cooling jacket 1000, a spindle sleeve 1100, a front end press cap 1200, a rear end press cap 1300, and an oil collection spacer ring 1400. The first bearing 600 and the second bearing 700 are respectively sleeved with the rotating shaft 100, after the bearing seat 300 is installed, the first bearing 600 is located at a first bearing installation position in the bearing seat 300, the second bearing 700 is located at a second bearing installation position in the bearing seat 300, the bearing spacer ring 800 is arranged between the first bearing 600 and the second bearing 700, the sealing element 500 is arranged at the front end of the bearing seat 300, the front end gland 1200 presses the sealing element 500, the dust cap 200 presses the front end gland 1200, the rotor-stator assembly 400 is sleeved on the rotating shaft 100, the cooling jacket 1000 is sleeved outside the rotor-stator assembly 400, the main shaft sleeve 1100 is sleeved outside the cooling jacket 1000, the main shaft sleeve 1100 is hermetically connected with the tail end of the bearing seat 300, one side of the main shaft sleeve 1100 facing the bearing seat 300 is provided with a first flow passage 910, the first flow passage 910 is communicated with the cooling flow passage 340, a gap between the cooling jacket 1000 and the main shaft sleeve 1100 forms a second flow passage 920, a third flow channel 930 is formed in one side of the spindle sleeve 1100, which is away from the bearing seat 300, the third flow channel 930 is communicated with the second flow channel 920, liquid outlets are respectively formed in the third flow channel 930 in the radial direction and the axial direction of the spindle sleeve 1100, a circulation hole is axially formed in the rear end gland 1300, and the circulation hole is communicated with the third flow channel 930, so that the cooling liquid can flow out of the electric spindle.

As shown in fig. 6, a first guide hole 810 is formed in the bearing spacer 800 corresponding to the bearing cavity of the first bearing 600, the first guide hole 810 is communicated with a first oil return groove 381 disposed near the first bearing 600, so that the lubricant gas of the first bearing 600 enters the oil return path 330 through the first guide hole 810 and the first oil return groove 381, a second guide hole 820 is formed in the bearing cavity of the bearing spacer 800 corresponding to the second bearing 700, the second guide hole 820 is communicated with a second oil return groove 382, a third oil return groove 383 is disposed on a side of the second bearing 700 facing away from the first bearing 600, an oil collection spacer 1400 is disposed at a position corresponding to the third oil return groove 383 of the electric spindle, an oil collection hole is formed in the bearing cavity of the oil collection spacer 1400 facing the second bearing 700, and the oil collection hole is communicated with the third oil return groove 383.

In this embodiment, one side of the second flow channel 920 in the axial direction is communicated with the first flow channel 910, the other side of the second flow channel 920 in the axial direction is communicated with the third flow channel 930, and an inlet end of the first flow channel 910 is located on an end surface of the main shaft sleeve 1100 for being attached to the end of the bearing seat 300, as shown in fig. 7, the first flow channel 910 is communicated with the liquid outlet flow channel 342.

In this scheme, in order to ensure that the electric spindle has a better oil backflow effect in both vertical and horizontal installation modes, an arc-shaped concave surface 541 is formed on one side of the sealing element 500 facing the first bearing 600 along the circumferential direction of the rotating shaft 100 in an extending manner, so as to form an oil collecting cavity 510 between the sealing element 500 and the first bearing 600, the oil collecting cavity 510 faces the bearing cavity of the first bearing 600, oil return holes 520 respectively communicated with the oil collecting cavity 510 and the oil return path 330 are formed in the radial direction of the sealing element 500, and the oil return holes 520 extend in the radial direction of the rotating shaft 100, as shown in fig. 6, when the electric spindle is installed horizontally, the oil can be respectively discharged from the front end side and the tail end side of the bearing seat 300, and when the electric spindle is installed vertically, the oil can be discharged from the oil return holes 520, so. In this embodiment, the sealing member 500 includes a first sealing portion 530 and a second sealing portion 540, the first sealing portion 530 can be detachably connected to the second sealing portion 540 by a screw connection, as shown in fig. 8, and the arc-shaped concave surface 541 is opened at the second sealing portion 540.

In summary, the present disclosure provides a bearing housing and an electric spindle, a first oil inlet passage 310 is connected to a first bearing installation location of the bearing housing 300, a second oil inlet passage 320 is connected to a second bearing installation location of the bearing housing 300, an oil return passage 330 is respectively connected to the first bearing installation location and the second bearing installation location, the bearing housing 300 is respectively provided with an independent lubrication passage for the first bearing installation location and the second bearing installation location, so as to ensure accuracy of lubrication parameters of two bearings, effectively reduce heat generated during a bearing working process, and improve a service life of the bearing, the cooling passage 340 includes a first passage 910 located inside the bearing housing 300 and a second passage 920 located at an outer peripheral side of the bearing housing 300, the first passage 910 is communicated with the second passage 920, after the bearing housing 300 in the present disclosure is installed on a motor spindle, an existing structural component for forming the cooling passage 340 can be eliminated, and occupation of a space is reduced, the outer diameter size of the front end of the electric spindle is reduced, one side of the sealing element 500 facing the first bearing 600 is provided with an arc-shaped concave surface 541 along the circumferential extension of the rotating shaft 100, an oil collecting cavity 510 is formed between the sealing element 500 and the first bearing 600, the oil collecting cavity 510 faces the bearing cavity of the first bearing 600, the sealing element 500 is radially provided with oil return holes 520 respectively communicated with the oil collecting cavity 510 and the oil return path 330, lubricating oil can be discharged from the front end side and the tail end side of the bearing seat 300 respectively, a double-oil-discharge structure is realized, and the electric spindle is ensured to have a better lubricating oil backflow effect under vertical and horizontal installation forms.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bearing pedestal (300) is arranged on an electric spindle, and is characterized in that the bearing pedestal (300) is provided with a first oil inlet channel (310), a second oil inlet channel (320), an oil return channel (330) and a cooling flow channel (340);

the first oil inlet oil path (310) is communicated to a first bearing mounting position of the bearing seat (300), the second oil inlet oil path (320) is communicated to a second bearing mounting position of the bearing seat (300), and the oil return oil path (330) is respectively communicated to the first bearing mounting position and the second bearing mounting position so as to facilitate backflow of lubricating oil;

the cooling flow channel (340) comprises a liquid inlet flow channel (341), a liquid outlet flow channel (342) and a heat exchange flow channel (343) arranged on the outer periphery of the bearing seat (300), and the liquid inlet flow channel (341) and the liquid outlet flow channel (342) are respectively communicated with the heat exchange flow channel (343).

2. The bearing pedestal (300) according to claim 1, wherein the first oil inlet path (310) comprises a first oil inlet section (311), a second oil inlet section (312) and a third oil inlet section (313) which are communicated in sequence;

first oil feed section (311) with third oil feed section (313) are followed the radial extension setting of bearing frame (300), second oil feed section (312) are followed the axial extension of bearing frame (300), the end orientation of producing oil of third oil feed section (313) first bearing installation department.

3. The bearing housing (300) of claim 2, wherein the bearing housing (300) is provided with a first radially extending oil spray plug (350), the third oil inlet section (313) is located in the first oil spray plug (350), and the first oil spray plug (350) is provided with a first oil spray hole (352) communicated with the third oil inlet section (313).

4. The bearing seat (300) according to claim 3, wherein a positioning member (351) is disposed at an outer end of the first oil spray plug (350), and a mounting groove (370) for being matched with the positioning member (351) is formed in a second flow passage (920) on the peripheral side of the bearing seat (300).

5. The bearing seat (300) according to claim 1, wherein the second oil inlet passage (320) comprises a fourth oil inlet section (321), a fifth oil inlet section (322) and a sixth oil inlet section (323) which are sequentially communicated, the fourth oil inlet section (321) and the sixth oil inlet section (323) are arranged along the radial extension of the bearing seat (300), the fifth oil inlet section (322) extends along the axial direction of the bearing seat (300), and the oil outlet end of the sixth oil inlet section (323) faces the second bearing installation position.

6. The bearing seat (300) according to claim 5, wherein a second oil injection plug (360) is installed on the bearing seat (300), the sixth oil inlet section (323) is located in the second oil injection plug (360), and the second oil injection plug (360) is provided with a second oil injection hole communicated with the sixth oil inlet section (323).

7. The bearing housing (300) according to claim 1, wherein the heat exchange flow channel (343) comprises a plurality of annular grooves (343 ' 1) formed along the circumferential direction of the bearing housing (300), and a notch (343 ' 2) is formed between two adjacent annular grooves (343 ' 1) to facilitate the circulation of the cooling fluid.

8. The bearing seat (300) according to claim 1, wherein the bearing seat (300) is provided with a first oil return groove (381), a second oil return groove (382) and a third oil return groove (383) which are respectively communicated with the oil return path (330);

the first oil return groove (381) is used for returning oil at the first bearing installation position, and the second oil return groove (382) and the third oil return groove (383) are respectively located on two opposite sides of the second bearing installation position and used for returning oil at the second bearing installation position.

9. An electric spindle, characterized in that a bearing housing (300) according to any of claims 1-8 is mounted.

10. The electric spindle according to claim 9, characterized in that the electric spindle comprises a rotating shaft (100) and a first bearing (600), a second bearing (700) and a sealing member (500) which are respectively sleeved with the rotating shaft (100);

the sealing member (500) is located the front end of bearing frame (300) holds, just sealing member (500) orientation one side of first bearing (600) is followed the circumference extension of pivot (100) is provided with arc concave surface (541), with sealing member (500) with form oil collecting cavity (510) between first bearing (600), the radial direction of sealing member (500) seted up respectively with oil collecting cavity (510) and oil return way (330) intercommunication oil return hole (520).

11. Electric spindle according to claim 10, characterized in that the seal (500) comprises a first seal portion (530) and a second seal portion (540) detachably mounted to the first seal portion (530), the curved concave surface (541) opening into the second seal portion (540).

12. The electric spindle according to claim 9, further comprising a rotor-stator assembly (400), a cooling jacket (1000), and a spindle sleeve (1100), wherein the spindle sleeve (1100) is sleeved outside the rotor-stator assembly (400), and the cooling jacket (1000) is disposed between the rotor-stator assembly (400) and the spindle sleeve (1100).

13. The electric spindle of claim 12, wherein a first flow channel (910) opens out on a side of the spindle sleeve (1100) facing the bearing housing (300), the first flow channel (910) communicating with the cooling flow channel (340);

a second flow passage (920) is formed in a gap between the cooling jacket (1000) and the main shaft sleeve (1100), and the second flow passage (920) is communicated with the first flow passage (910);

a third flow channel (930) is formed in one side, away from the bearing seat (300), of the spindle sleeve (1100), the third flow channel (930) is communicated with the second flow channel (920), and liquid outlets are formed in the third flow channel (930) towards the radial direction and the axial direction of the spindle sleeve (1100) respectively.