CN112049866A - Bearing housing and electric spindle - Google Patents

Abstract

The present application generally relates to the technical field of machine tools, and in particular, to a bearing seat and an electric spindle. At the second bearing installation place, the oil return oil passage is connected to the first bearing installation place and the second bearing installation place respectively, so as to facilitate the return of lubricating oil. Separate lubrication flow passages are designed for the first bearing and the second bearing to ensure Accurate lubrication parameters reduce the heat generated during the working process of the bearing and improve the service life of the bearing. The cooling flow channel includes a first flow channel located inside the bearing seat and a second flow channel opened on the outer peripheral side of the bearing seat. The first flow channel and The second flow channel is connected, the existing structural member for forming the cooling flow channel is cancelled, and the cooling flow channel is opened in the bearing seat, which reduces the occupation of space and reduces the outer diameter of the front end of the electric spindle.

Description

Bearing housing and electric spindle

technical field

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

Background technique

The motorized spindle has a transmission structure mode in which the built-in motor and the machine tool spindle are "integrated into one". The bearing is the core of the motorized spindle and its rotating support components. Its lubrication and cooling play a crucial role in the rotation accuracy, processing quality and service life of the spindle. The important role of oil-air lubrication is to mix lubricating oil with compressed air, send it to the fuel injection nozzle through the oil pipeline, and spray it to the bearing from the fuel injection nozzle. Or radial inflow, which increases the wall thickness of the entire sleeve, and reduces the wall thickness of the bearing seat connected to the sleeve at the front end of the main shaft. rigidity.

SUMMARY OF THE INVENTION

A series of concepts in simplified form have been introduced in the Summary section, which are described in further detail in the Detailed Description section. The content part of this application is not intended to attempt to limit the key features and necessary technical features of the claimed technical solution, much less an attempt to determine the protection scope of the claimed technical solution.

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

In order to realize the above-mentioned purpose of the invention, the application adopts the following technical solutions:

A bearing seat is installed on an electric spindle, and the bearing seat is provided with a first oil inlet oil circuit, a second oil inlet oil circuit, an oil return oil circuit and a cooling flow channel;

The first oil inlet oil passage is connected to the first bearing installation position of the bearing seat, the second oil inlet oil passage is connected to the second bearing installation position of the bearing seat, and the oil return oil passages are respectively connected to each other. to the first bearing installation and the second bearing installation to facilitate the return of lubricating oil;

The cooling flow channel includes a liquid inlet flow channel, a liquid outlet flow channel and a heat exchange flow channel opened on the outer peripheral side of the bearing seat, and the liquid inlet flow channel and the liquid outlet flow channel are respectively connected with the heat exchange flow channel. Road connection.

Further, in some embodiments of the present solution, the above-mentioned first oil inlet oil passage includes a first oil inlet section, a second oil inlet section and a third oil inlet section that are connected in sequence;

The first oil inlet section and the third oil inlet section extend along the radial direction of the bearing seat, the second oil inlet section extends along the axial direction of the bearing seat, and the third oil inlet section extends along the axial direction of the bearing seat. The oil outlet end faces the first bearing installation.

Further, in some embodiments of the present solution, the bearing seat is installed with a radially extending first fuel injection plug, the third oil inlet section is located in the first fuel injection plug, and the first fuel injection plug is installed. The oil plug is provided with a first oil injection hole communicating with the third oil inlet section.

Further, in some embodiments of this solution, a positioning member is provided at the outer end of the first fuel injection plug, and a mounting groove for matching with the positioning member is provided on the second flow channel on the peripheral side of the bearing seat.

Further, in some embodiments of this solution, the above-mentioned second oil inlet oil passage includes a fourth oil inlet section, a fifth oil inlet section and a sixth oil inlet section that are connected in sequence, and the fourth oil inlet section and all the The sixth oil inlet section extends along the radial direction of the bearing seat, the fifth oil inlet section extends along the axial direction of the bearing seat, and the oil outlet end of the sixth oil inlet section faces the second oil inlet section. bearing installation.

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

Further, in some embodiments of this solution, the heat exchange flow channel includes a plurality of annular grooves opened along the circumferential direction of the bearing seat, and a notch is opened between two adjacent annular grooves, so as to facilitate Coolant flows.

Further, in some embodiments of this solution, the bearing housing is provided with a first oil return groove, a second oil return groove and a third oil return groove for communicating with the oil return oil circuit, respectively;

The first oil return groove is used for oil return at the installation of the first bearing, and the second oil return groove and the third oil return groove are respectively located on opposite sides of the installation of the second bearing and used for the Return oil at the second bearing installation.

An electric spindle is provided with the above bearing seat.

Further, in some embodiments of this solution, the above-mentioned electric spindle includes a rotating shaft and a first bearing, a second bearing and a sealing member respectively sleeved with the rotating shaft;

The sealing member is located at the front end of the bearing seat, and the side of the sealing member facing the first bearing is provided with an arc-shaped concave surface extending along the circumferential direction of the rotating shaft, so that the sealing member and the An oil collecting cavity is formed between the first bearings, and oil return holes respectively communicated with the oil collecting cavity and the oil return oil passage are opened in the radial direction of the sealing member.

Further, in some embodiments of this solution, the above-mentioned sealing member 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 in the second sealing portion .

Further, in some embodiments of this solution, the above-mentioned electric spindle further includes a rotor-stator assembly, a cooling jacket and a spindle sleeve, the spindle sleeve is sleeved on the outside of the rotor-stator assembly, and the cooling sleeve is disposed on the outer side of the rotor-stator assembly. between the rotor stator assembly and the main shaft sleeve.

Further, in some embodiments of this solution, a first flow channel is opened on the side of the main shaft sleeve facing the bearing seat, and the first flow channel is communicated with the cooling flow channel;

The gap between the cooling jacket and the main shaft sleeve forms a second flow channel, and the second flow channel communicates with the first flow channel;

The side of the spindle sleeve away from the bearing seat is provided with a third flow channel, the third flow channel communicates with the second flow channel, and the third flow channel faces the radial direction of the spindle sleeve And the axial direction is respectively provided with a liquid outlet.

As can be seen from the above technical solutions, the advantages and positive effects of the bearing seat and the motorized spindle of the present application are:

The bearing seat is provided with a first oil inlet oil passage, a second oil inlet oil passage, an oil return oil passage and a cooling flow passage. The first oil inlet oil passage is connected to the first bearing installation place of the bearing seat, and the second oil inlet oil passage Connected to the second bearing installation of the bearing seat, and the oil return oil circuit is connected to the first bearing installation and the second bearing installation respectively, so as to facilitate the return of lubricating oil. Independent lubrication is designed for the first bearing and the second bearing. The flow channel ensures the accuracy of the lubrication parameters, reduces the heat generated during the working process of the bearing, and improves the service life of the bearing. The cooling flow channel includes a first flow channel located inside the bearing seat and a second flow channel opened on the outer peripheral side of the bearing seat. The first flow channel is communicated with the second flow channel, the existing structural member forming the cooling flow channel is cancelled, and the cooling flow channel is opened in the bearing seat, which reduces the space occupation and the outer diameter of the front end of the electric spindle.

Description of 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 following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. In other words, on the premise of no creative labor, other drawings can also be obtained from these drawings.

FIG. 1 is a schematic three-dimensional structural diagram of a bearing seat according to an exemplary embodiment.

Fig. 2 is a schematic three-dimensional structural diagram of a first fuel injection plug (second fuel injection plug) of a bearing seat according to an exemplary embodiment.

3 is a schematic cross-sectional structural diagram of a first fuel injection plug (second fuel injection plug) of a bearing housing according to an exemplary embodiment.

FIG. 4 is a schematic structural diagram of a first oil inlet oil passage of an electric spindle according to an exemplary embodiment.

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

Fig. 6 is a schematic structural diagram of an oil return oil circuit of an electric spindle according to an exemplary embodiment.

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

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

Among them, the reference numerals are described as follows:

100-shaft; 200-dust cover; 300-bearing seat; 400-rotor stator assembly; 500-seal; 600-first bearing; 700-second bearing; 800-bearing spacer; 900-shell; 1000 -Cooling jacket; 1100-spindle sleeve; 1200-front gland; 1300-rear gland; 1400-oil collecting spacer;

310-first oil inlet; 320-second inlet; 330-return oil; 340-cooling channel; 350-first injection plug; 360-second injection plug; 370-installation groove;

311 - the first oil inlet section; 312 - the second oil inlet section; 313 - the third oil inlet section;

321 - the fourth oil inlet section; 322 - the fifth oil inlet section; 323 - the sixth oil inlet section;

341-inlet flow channel; 342-outlet flow channel; 343-heat exchange flow channel;

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

351-positioning piece; 352-first fuel injection hole;

381- the first oil return tank; 382- the second oil return tank; 383- the third oil return tank;

510 - oil collecting chamber; 520 - oil return hole; 530 - first sealing part; 540 - second sealing part;

541 - Arc concave;

810 - the first guide hole; 820 - the second guide hole;

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

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

This solution provides a bearing seat and an electric spindle. The bearing seat 300 is installed on the 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 passage 310, a second oil inlet oil passage 320, The oil return oil passage 330 and the cooling flow passage 340, the first oil inlet oil passage 310 is connected to the first bearing installation place of the bearing seat 300, the second oil inlet oil passage 320 is connected to the second bearing installation place of the bearing seat 300, The oil passage 330 is respectively connected to the first bearing installation place and the second bearing installation place, and the bearing seat 300 is designed with independent lubricating flow passages for the first bearing installation place and the second bearing installation place respectively, so as to ensure the accuracy of the lubrication parameters of the two bearings. , effectively reduce the heat generated during the working process of the bearing and improve the service life of the bearing. The cooling flow channel 340 includes a first flow channel 910 located inside the bearing seat 300 and a second flow channel 920 opened on the outer peripheral side of the bearing seat 300. The first flow channel 910 is communicated with the second flow channel 920. After the bearing seat 300 in this solution is installed on the motor spindle, the existing structural member used to form the cooling flow channel 340 can be eliminated, the space occupation is reduced, and the outer diameter of the front end of the motor spindle can be reduced. .

1-4, in this solution, the first oil inlet oil passage 310, the second oil inlet oil passage 320, and the oil return oil passage 330 are respectively arranged inside the bearing seat 300, and the first oil inlet oil passage 310 includes sequentially The first oil inlet section 311 , the second oil inlet section 312 and the third oil inlet section 313 communicate with each other. The first oil inlet section 311 and the third oil inlet section 313 extend along the radial direction of the bearing seat 300 . The oil inlet of the section 311 is located on the peripheral side of the end of the bearing seat 300, the second oil inlet section 312 extends along the axial direction of the bearing seat 300, the bearing seat 300 is installed with a radially extending first fuel injection plug 350, and the third oil inlet The segment 313 is located in the first fuel injection plug 350 , and the first fuel injection plug 350 is provided with a first fuel injection hole 352 communicating with the third fuel inlet segment 313 , and the first fuel injection hole 352 faces the first bearing installation place. As shown in FIG. 5 , the second oil inlet passage 320 includes a fourth oil inlet section 321 , a fifth oil inlet section 322 and a sixth oil inlet section 323 , a fourth oil inlet section 321 and a sixth oil inlet section that are connected in sequence. 323 extends along the radial direction of the bearing seat 300, the fifth oil inlet section 322 extends along the axial direction of the bearing seat 300, the bearing seat 300 is installed with a radially extending second fuel injection plug 360, and the sixth oil inlet section 323 is located in the Inside the second fuel injection plug 360, and the second fuel injection plug 360 is provided with a second fuel injection hole that communicates with the sixth oil inlet section 323. In this embodiment, the first fuel injection hole 352 and the second fuel injection hole are respectively located at The centerlines of the electro-spindle are on a section at a distance of 30°. As shown in FIG. 1 , the first fuel injection plug 350 and the second fuel injection plug 360 protrude from the radial direction of the bearing seat 300 respectively. In this solution, the first fuel injection plug 350 and the second fuel injection plug 360 have the same structure and are installed. The method is the same. Therefore, only the structure of the first fuel injection plug 350 will be introduced. Referring to FIG. 2-3, the outer end of the first fuel injection plug 350 is provided with a positioning member 351, and the outer end of the first fuel injection plug 350 is located at the outer end of the first fuel injection plug 350. At the outer end of the bearing seat 300, the second flow channel 920 on the peripheral side of the bearing seat 300 is provided with a mounting groove 370 for matching with the positioning member 351, which ensures the stability of the installation of the fuel injection plug and prevents the oil flow channel from being placed in the second flow channel 920. Problems inside the cooling runner 340 . On the basis of the above structure, those skilled in the art can realize the fixed connection of the first fuel injection plug 350 and the second fuel injection plug 360 with the bearing seat 300 by means of threaded connection, and the positioning member 351 is provided with threaded holes, The design of the first fuel injection plug 350 and the second fuel injection plug 360 ensures smooth oil and gas passages, and reduces the difficulty of machining the bearing seat 300 .

As shown in FIG. 6 , the oil return oil passage 330 includes extending along the radial direction of the bearing seat 300 , the inner wall surface of the bearing seat 300 is provided with a first oil return groove 381 near the installation of the first bearing, and the bearing seat 300 is installed on the second bearing. A second oil return groove 382 and a third oil return groove 383 are respectively provided on both sides of the shaft in the axial direction. The oil is returned at the bearing installation place and the second bearing installation place. In this embodiment, the oil return oil circuit 330 includes a radially extending first oil return section and a circumferentially extending second oil return section. The outlet section is located on the bottom peripheral side of the bearing housing 300 .

As shown in FIG. 7 , in this solution, the bearing seat 300 is further provided with a cooling channel 340 . The cooling channel 340 includes a liquid inlet channel 341 , a liquid outlet channel 342 and a heat exchange channel 343 . The hot runner 343 includes a plurality of annular grooves 343'1 opened along the circumferential direction of the bearing seat 300, and a notch 343'2 is opened between two adjacent annular grooves 343'1 to facilitate the circulation of the cooling liquid. During installation, the bearing seat 300 is installed with a hollow cylindrical shell 900, the inner wall of the shell 900 is sealed with the bearing seat 300, and the annular groove 343'1 and the inner wall of the shell 900 form a heat exchange channel 343. Under the understanding of those skilled in the art, The structure of the heat exchange flow channel 343 in this embodiment may also be a spiral structure or a reciprocating folded structure. The liquid inlet of the liquid inlet channel 341 is located on the peripheral side of the bottom of the bearing seat 300, and the liquid outlet of the liquid outlet channel 342 is located on the bottom end face of the bearing seat 300, so as to communicate with the inner flow channel of the main shaft sleeve 1100 of the electric spindle, The liquid inlet channel 341 communicates with the annular groove 343 ′ 1 near the front end of the bearing seat 300 , and the liquid outlet channel 342 communicates with the annular groove 343 ′ 1 near the end of the bearing seat 300 .

This embodiment also provides an electric spindle, which is installed with the above-mentioned bearing seat 300 . Referring to FIGS. 4-7 , the electric spindle includes a rotating shaft 100 , a dust cover 200 , a rotor-stator assembly 400 , a seal 500 , a first bearing 600 , a second Bearing 700 , bearing spacer 800 , housing 900 , cooling jacket 1000 , main shaft sleeve 1100 , front end gland 1200 , rear end gland 1300 and oil collecting spacer 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 in the bearing seat 300 where the first bearing is installed, and the second bearing 700 is located in the bearing seat 300. The second bearing is installed in The bearing spacer 800 is arranged between the first bearing 600 and the second bearing 700, the sealing member 500 is arranged at the front end of the bearing seat 300, the front end gland 1200 glands the sealing member 500, and the dust cover 200 glands the front end gland. 1200, the rotor-stator assembly 400 is sleeved on the rotating shaft 100, the cooling jacket 1000 is sleeved with the outer side of the rotor-stator assembly 400, the outer side of the cooling jacket 1000 is sleeved with the main shaft sleeve 1100, and the main shaft sleeve 1100 is sealed with the end of the bearing seat 300. The side of the spindle sleeve 1100 facing the bearing seat 300 is provided with a first flow channel 910 , the first flow channel 910 communicates with the cooling flow channel 340 , and the gap between the cooling jacket 1000 and the spindle sleeve 1100 forms a second flow channel 920 . The flow channel 920 communicates with the first flow channel 910 , a third flow channel 930 is opened on the side of the spindle sleeve 1100 away from the bearing seat 300 , the third flow channel 930 communicates with the second flow channel 920 , and the third flow channel 930 faces the spindle sleeve The radial and axial directions of the 1100 are respectively provided with liquid outlets, and the rear end gland 1300 is provided with a flow hole in the axial direction.

As shown in FIG. 6 , the bearing spacer 800 is provided with a first guide hole 810 corresponding to the bearing chamber of the first bearing 600 . The lubricating oil of the bearing 600 enters the oil return oil passage 330 through the first guide hole 810 and the first oil return groove 381 . The bearing spacer 800 is provided with a second guide hole 820 corresponding to the bearing chamber of the second bearing 700 . The flow hole 820 communicates with the second oil return groove 382 , the third oil return groove 383 is located on the side of the second bearing 700 that faces away from the first bearing 600 , and the electric spindle is provided with an oil collecting spacer 1400 corresponding to the third oil return groove 383 to collect oil. The spacer ring 1400 is provided with an oil collecting hole facing the bearing chamber of the second bearing 700 , and the oil collecting hole communicates with the third oil return groove 383 .

In this embodiment, the second flow channel 920 is located on one side in the axial direction and communicates with the first flow channel 910 , the second flow channel 920 is located on the other side in the axial direction and communicates with the third flow channel 930 . The inlet end is located on the end surface of the main shaft sleeve 1100 that is used to fit and connect with the end of the bearing seat 300 . As shown in FIG. 7 , the first flow channel 910 communicates with the liquid outlet flow channel 342 .

In this solution, in order to ensure that the electric spindle has a good lubricating oil return effect in the vertical and horizontal installation forms, the side of the sealing member 500 facing the first bearing 600 is provided with an arc-shaped concave surface extending along the circumferential direction of the rotating shaft 100 541, to form an oil collecting chamber 510 between the seal 500 and the first bearing 600, the oil collecting chamber 510 faces the bearing chamber of the first bearing 600, and the seal 500 is provided with oil collecting chambers 510 and 510 in the radial direction of the seal 500 respectively. The oil return hole 520 is communicated with the oil return oil passage 330. The oil return hole 520 is extended in the radial direction of the rotating shaft 100. As shown in FIG. The front end side and the end side are discharged. When the electric spindle is installed vertically, the lubricating oil can be discharged from the oil return hole 520 to ensure the oil return effect. 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 means of screw connection. As shown in FIG. 8, the arc-shaped concave surface 541 is opened in the second sealing portion 540 .

In summary, this solution provides a bearing seat and an electric spindle, the first oil inlet oil passage 310 is connected to the first bearing installation of the bearing seat 300 , and the second oil inlet oil passage 320 is connected to the second bearing installation of the bearing seat 300 The oil return oil passage 330 is respectively connected to the first bearing installation place and the second bearing installation place, and the bearing seat 300 is designed with independent lubricating flow passages for the first bearing installation place and the second bearing installation place respectively, so as to ensure the lubrication of the two bearings. Accurate parameters can effectively reduce the heat generated during the working process of the bearing and improve the service life of the bearing. The cooling flow channel 340 includes a first flow channel 910 located inside the bearing seat 300 and a second flow channel 920 opened on the outer peripheral side of the bearing seat 300. The first flow channel 910 is communicated with the second flow channel 920. After the bearing seat 300 in this solution is installed on the motor spindle, the existing structural components for forming the cooling flow channel 340 can be eliminated, the space occupation is reduced, and the front end of the motor spindle is reduced. Outer diameter, the side of the seal 500 facing the first bearing 600 is provided with an arc-shaped concave surface 541 extending along the circumferential direction of the rotating shaft 100, and an oil collecting cavity 510 is formed between the seal 500 and the first bearing 600, and the oil collecting cavity 510 faces the bearing chamber of the first bearing 600 , and the seal 500 is radially provided with oil return holes 520 respectively communicating with the oil collecting chamber 510 and the oil return oil passage 330 . And the end side discharge to realize the double oil discharge structure, which ensures that the motorized spindle has a good lubricating oil return effect in the vertical and horizontal installation forms.

It should be noted that, in this document, relational terms such as "first" and "second" etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement 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 implemented in 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 claimed herein.

Claims (13)

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.

Images