Shaft assembly and transmission system

Abstract

The present invention relates to the field of installation and support of a rotating shaft, and provides a rotating shaft assembly and a transmission system. The rotating shaft assembly includes a support unit and a rotating shaft, the support unit includes a bearing seat, and the rotating shaft is supported on the bearing seat through a bearing; along the axial direction of the rotating shaft, at least one side of the bearing has a first upper liquid structure and a second upper liquid structure, the first upper liquid structure is fixed to the rotating shaft, and the second upper liquid structure is fixed to the bearing seat, a first annular cavity around the rotating shaft is formed between the first upper liquid structure and the second upper liquid structure, the first upper liquid structure has a first upper liquid channel, the second upper liquid structure has a second upper liquid channel, and the first upper liquid channel and the second upper liquid channel are both connected to the first annular cavity; the first upper liquid channel has a first liquid throwing section with a liquid outlet facing the bearing, and the first liquid throwing section is located at the front end of the first upper liquid structure, and the first liquid throwing section is inclined radially outward. It is beneficial to improve the heat dissipation efficiency of the rotating shaft assembly and ensure the good operation of the rotating shaft.

Description

Technical Field

[0001] The invention relates to the field of installation and support of rotating shafts, and in particular to a rotating shaft assembly and a transmission system. Background Art

[0002] The ball screw nut pair tends to generate a lot of heat when running at high speed. The main sources of heat generation of the ball screw nut pair include the matching position of the nut and the screw, and the supporting position of the screw.

[0003] In order to reduce the temperature of the ball screw nut pair at the screw support position, the prior art provides a cooling structure at the screw support position, and coolant is conducted through the cooling structure.

[0004] Some prior arts place a cooling structure on the screw rod and form a channel for conveying coolant by machining a hollow hole in the screw rod. However, machining the channel for conveying coolant on the screw rod is difficult and can easily affect the structural strength of the screw rod.

[0005] Some other prior arts place the cooling structure on the bearing seat supporting the screw rod, but the cooling effect of the bearing is poor. Summary of the invention

[0006] One of the objects of the present invention is to provide a shaft assembly with good cooling effect.

[0007] In order to achieve the above-mentioned purpose, the rotating shaft assembly provided by the present invention includes a supporting unit and a rotating shaft, the supporting unit includes a bearing seat, the rotating shaft is supported on the bearing seat by a bearing, the bearing seat has a cylindrical cavity, and the bearing is located in the cylindrical cavity; along the axial direction of the rotating shaft, at least one side of the bearing has a first upper liquid structure and a second upper liquid structure, the first upper liquid structure is fixed to the rotating shaft, and the second upper liquid structure is fixed to the bearing seat, and a first annular cavity surrounding the rotating shaft is formed between the first upper liquid structure and the second upper liquid structure, the first upper liquid structure has a first upper liquid channel, and the second upper liquid structure has a second upper liquid channel, and the first upper liquid channel and the second upper liquid channel are both connected to the first annular cavity; the first upper liquid channel has a first liquid throwing section with a liquid outlet facing the bearing, and the first liquid throwing section is located at the front end of the first upper liquid structure along the axial direction of the rotating shaft from the first upper liquid structure to the bearing, and the first liquid throwing section is inclined radially outward.

[0008] As can be seen from the above, the present invention supplies coolant to the first upper liquid channel through the structural design of the rotating shaft assembly by connecting the coolant externally to the second upper liquid channel. Since the first upper liquid channel has a first liquid-throwing section, under the action of the centrifugal force of the rotating shaft, the coolant is sprayed from the first liquid-throwing section toward the bearing, which is beneficial to increasing the circulation rate of the coolant in the bearing seat cylinder cavity, and is beneficial to quickly taking away the heat generated at the rotating shaft support position, which is beneficial to improving the heat dissipation efficiency of the rotating shaft assembly and ensuring the good operation of the rotating shaft. In addition, the present invention does not need to process a hollow upper liquid hole on the rotating shaft, which is beneficial to improving the structural strength of the rotating shaft and reducing the difficulty of processing the upper liquid channel.

[0009] A preferred solution is that, along the axial direction of the rotating shaft, the first upper liquid structure abuts against the inner ring of the bearing, and / or the second upper liquid structure abuts against the outer ring of the bearing.

[0010] As can be seen from the above, the first upper liquid structure and the second upper liquid structure provide axial positioning for the inner and outer rings of the bearing respectively, which is beneficial to reducing the number of parts of the shaft assembly and facilitating the simplification of the structure of the shaft assembly.

[0011] Another preferred solution is that the first annular cavity is formed by an annular groove opened on the outer peripheral wall of the first upper liquid structure.

[0012] As can be seen from the above, this is helpful to reduce the difficulty of machining the first ring cavity.

[0013] Another preferred solution is that the first upper liquid structure and the second upper liquid structure are gap-matched, a second annular cavity is formed between the first upper liquid structure and the second upper liquid structure, and the second annular cavity is located on the liquid leakage side of the first annular cavity.

[0014] As can be seen from the above, this helps to prevent external debris from entering the barrel cavity of the bearing seat and prevent external debris from affecting the operation of the bearing.

[0015] A further solution is that the wall surface of the second annular cavity on the side close to the first annular cavity is a step surface.

[0016] As can be seen from the above, this is further conducive to improving the ability of the second annular cavity to retain external debris.

[0017] Another preferred solution is that the rotating shaft is a screw shaft.

[0018] Another preferred solution is that the supporting unit also includes a lower liquid structure, which is located on the side of the bearing away from the first upper liquid structure and the second upper liquid structure along the axial direction of the rotating shaft; the lower liquid structure is fixed to the bearing seat, and the lower liquid structure has a lower liquid channel, and the lower liquid channel has a second liquid throwing section extending radially.

[0019] As can be seen from the above, this is conducive to forming a channel for the circulation of the coolant, and the setting of the second liquid-throwing section is conducive to accelerating the outflow of the coolant from the cylindrical cavity of the bearing seat, which is further conducive to increasing the circulation rate of the coolant in the cylindrical cavity of the bearing seat, and further conducive to rapid heat dissipation of the shaft assembly.

[0020] Another preferred solution is that the end of the first liquid upper structure close to the bearing has an inclined end surface facing the bearing, the liquid outlet of the first liquid throwing section is located on the inclined end surface, and the depth direction of the first liquid throwing section is along the normal direction of the inclined end surface.

[0021] As can be seen from the above, this is conducive to reducing the processing difficulty of the first liquid-spinning section.

[0022] Another preferred solution is that the bearing seat includes an outer seat and an inner seat, the inner seat is cylindrical, the outer seat is fixedly sleeved on the outer periphery of the inner seat, and the bearing is arranged in the cylindrical cavity of the inner seat; a first cooling channel is formed between the outer seat and the inner seat, and the first cooling channel has a coolant inlet and a coolant outlet.

[0023] As can be seen from the above, by introducing coolant into the first cooling channel, it is beneficial to cool the bearing seat, further beneficial to the rapid heat dissipation of the shaft assembly, and further beneficial to the smooth operation of the shaft.

[0024] A further solution is that the coolant inlet and the coolant outlet are both arranged on the outer seat.

[0025] A further solution is that the first cooling channel is arranged around the outer peripheral wall of the inner seat, and the first cooling channel extends in an axial direction of the rotating shaft in a spiral.

[0026] As can be seen from the above, this is conducive to guiding the coolant to flow sequentially, to guiding the coolant to flow into and out of the first cooling channel in sequence, to avoiding high-temperature coolant from being retained in the first cooling channel, and further to facilitating rapid cooling of the bearing seat.

[0027] A further solution is that along the axial direction of the rotating shaft, both sides of the first cooling channel are provided with sealing rings, and the sealing rings are squeezed between the outer seat and the inner seat.

[0028] As can be seen from the above, this is helpful to avoid leakage of the coolant in the first cooling channel.

[0029] Another preferred solution is that the cross-sectional area of ​​the first liquid-spinning section is smaller than the cross-sectional area of ​​other positions of the first upper liquid channel; and the cross-sectional area of ​​the first liquid-spinning section is smaller than the cross-sectional area of ​​the second upper liquid channel.

[0030] Another preferred solution is that an upper liquid one-way valve is provided at the liquid inlet of the second upper liquid channel, or an upper liquid one-way valve is provided on the external liquid path communicating with the second upper liquid channel.

[0031] As can be seen from the above, this is conducive to preventing the coolant in the first upper liquid channel from being thrown toward the second upper liquid channel under the action of centrifugal force, and preventing the coolant from flowing in the opposite direction of the upper liquid direction; and, in this way, after the coolant in the first upper liquid channel is thrown toward the bearing through the first throwing section, it can generate negative pressure suction in the first throwing section, and then the coolant is drawn from the external liquid source through the second upper liquid channel through the negative pressure suction. Therefore, without the need for an external liquid source to provide pressure, the coolant can be quickly circulated in the barrel cavity of the bearing seat, thereby achieving rapid cooling of the rotating shaft assembly and ensuring good operation of the rotating shaft.

[0032] A second object of the present invention is to provide a transmission system with good cooling effect.

[0033] In order to achieve the above-mentioned purpose, the transmission system provided by the present invention includes a motor and the aforementioned rotating shaft assembly, and the rotating shaft is drivingly connected to the output shaft of the motor.

[0034] As can be seen from the above, the use of the aforementioned shaft assembly is conducive to rapid heat dissipation at the shaft support, which helps to ensure smooth operation of the shaft.

[0035] A preferred solution is that the bearing seat has a fixing portion, the fixing portion is fixedly connected to the housing of the motor, and the fixing portion has a second cooling channel.

[0036] As can be seen from the above, this helps to prevent the heat of the motor from being transferred to the bearing seat through the fixing part and then transferred to the bearing, thereby preventing the heat of the motor from affecting the operation of the shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a structural diagram of an embodiment of a transmission system of the present invention;

[0038] Figure 2 It is a partial cross-sectional view of the transmission system embodiment of the present invention through the first upper liquid channel 41 and the axis of the screw rod 500;

[0039] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0040] Figure 4 yes Figure 2 A partial enlarged view of point B in the middle;

[0041] Figure 5 It is a structural diagram of the first moving end cover 4 in the rotating shaft assembly of the present invention;

[0042] Figure 6 It is a partial cross-sectional view of the supercooling liquid inlet 224, the cooling liquid outlet and the axis of the screw rod 500 of the transmission system embodiment of the present invention;

[0043] Figure 7 yes Figure 6A partial enlarged view of point C in the middle;

[0044] Figure 8 It is a structural diagram of the inner seat 22 in the rotating shaft assembly of the present invention;

[0045] Fig. 9 It is a cross-sectional view along the normal direction X of the fixing portion 211 in the shaft assembly of the present invention. DETAILED DESCRIPTION

[0046] Rotating shaft assembly and transmission system embodiment:

[0047] Please refer to Figures 1 to 5 The transmission system of this embodiment includes a motor 200 and a rotating shaft assembly of this embodiment, the motor 200 includes a housing 201 and an output shaft 202, the rotating shaft assembly includes a screw 500 and a supporting unit 100, and the supporting unit 100 includes a bearing 1, a bearing seat 2, a first movable end cover 4, a first fixed end cover 5, a second movable end cover 7, a first locking nut 8 and a second locking nut 6.

[0048] Please refer to Figure 1 In this embodiment, the screw rod 500 is a rotating shaft, and the supporting unit 100 has two, which are the supporting unit 100a and the supporting unit 100b. The supporting unit 100a and the supporting unit 100b are respectively supported at the two ends of the axial direction X of the screw rod 500, and the output shaft 202 of the motor 200 is fixedly connected to the end of the screw rod 500 supported by the supporting unit 100a through a coupling 400. The bearing seat 2 of the supporting unit 100a has a fixing portion 211, and the bearing seat 2 of the supporting unit 100b has no fixing portion 211. The fixing portion 211 is fixedly connected to the housing 201 of the motor 200 by screws 3, and the main structure of the supporting unit 100a is the same as that of the supporting unit 100b.

[0049] Alternatively, in other embodiments of the present invention, the rotating shaft may also be another rotating shaft besides the screw rod 500 .

[0050] Please refer to Figure 2 The bearing seat 2 includes an inner seat 22 and an outer seat 21. The outer seat 21 is fixedly sleeved on the outer peripheral wall of the inner seat 22. The inner seat 22 is cylindrical. The bearing 1 is located in the cylindrical cavity 223 of the inner seat 22. The screw rod 500 passes through the inner ring of the bearing 1. The screw rod 500 is supported on the inner wall of the cylindrical cavity 223 of the inner seat 22 through the bearing 1.

[0051] Please refer to Figure 2 The first locking nut 8 and the second locking nut 6 are respectively threadedly connected to the screw rod 500, and the first fixed end cover 5 is fixedly connected to the inner seat 22 by screws.

[0052] Please refer to Figure 2Along the axial direction X of the screw rod 500, one end of the inner seat 22 has a positioning ring 222 protruding radially inward, the positioning ring 222, the outer ring of the bearing 1 and the first fixed end cover 5 are abutted in sequence, and the first locking nut 8, the second movable end cover 7, the inner ring of the bearing 1, the first movable end cover 4 and the second locking nut 6 are abutted and fixed in sequence.

[0053] Please refer to Figure 3 and Figure 5 A first annular cavity 42 is formed between the first movable end cover 4 and the first fixed end cover 5 around the screw rod 500 . Specifically, the first annular cavity 42 is formed by an annular groove opened on the outer peripheral wall of the first movable end cover 4 .

[0054] Please refer to Figure 3 In this embodiment, the first movable end cover 4 is a first upper liquid structure. The first movable end cover 4 has a first upper liquid channel 41. The first upper liquid channel 41 includes a first radial section 411, a first axial section 412 and a first liquid-spinning section 413 which are connected in sequence. The first radial section 411 is directly connected to the first annular cavity 42, and points from the first movable end cover 4 to the direction of the bearing 1 along the axial direction X of the screw rod 500. The first liquid-spinning section 413 is located at the front end of the first movable end cover 4, and the first liquid-spinning section 413 is inclined radially outward, and the liquid outlet of the first liquid-spinning section 413 faces the bearing 1.

[0055] Please refer to Figure 3 In this embodiment, the first fixed end cover 5 is a second upper liquid structure. The first fixed end cover 5 has a second upper liquid channel 51. The second upper liquid channel 51 includes a second radial section 511, a second axial section 512 and a third radial section 513 which are connected in sequence. The second radial section 511 is connected to the outside of the first fixed end cover 5, and the third radial section 513 is connected to the first annular cavity 42.

[0056] Optionally, in other embodiments of the present invention, the first upper liquid structure can also be integrally formed with the screw rod 1, and similarly, the second upper liquid structure can also be integrally formed with the inner seat 22. Of course, this is not conducive to processing the first upper liquid channel 41 on the first upper liquid structure, nor is it conducive to processing the second upper liquid channel 51 on the second upper liquid structure. Therefore, it is preferred that the first upper liquid structure and the screw rod 500 are separately arranged, and it is preferred that the second upper liquid structure and the inner seat 22 are separately arranged.

[0057] Alternatively, in other embodiments of the present invention, the axial positioning of the bearing 1 may also be achieved by using other structures, and the first liquid supply structure and the second liquid supply structure are only used to introduce coolant into the cylindrical cavity 223 of the inner seat 22 .

[0058] Optionally, in other embodiments of the present invention, the inner ring of the bearing 1 has an interference fit with the screw 500, and the outer ring of the bearing 1 has an interference fit with the inner seat 22, and when the bearing 1 is not subjected to axial load, the bearing 1 does not need to be axially limited, and the first movable end cover 4 and the first fixed end cover 5 may not have the function of axially limiting the bearing 1.

[0059] Of course, the coolant introduced into the cylindrical cavity 223 of the inner seat 22 preferably also has a lubricating function.

[0060] Please refer to Figure 4 The positioning ring 222 is a lower liquid structure, and the positioning ring 222 has a lower liquid channel 2221. The lower liquid channel 2221 includes a fourth radial segment 22211 and a third axial segment 22212 that are connected in sequence. The fourth radial segment 22211 of this embodiment is a second liquid-throwing segment. The fourth radial segment 22211 is connected to the cylindrical cavity 223 of the inner seat 22, and the third axial segment 22212 is connected to the axial outer side of the inner seat 22.

[0061] Alternatively, in other embodiments of the present invention, the lower liquid structure may also be provided separately from the inner seat 22, and the lower liquid structure is fixedly connected to the inner seat 22, which can also achieve the purpose of the invention.

[0062] When the transmission system is running, the motor 200 drives the screw 500 to rotate, and the coolant enters the barrel cavity 223 of the inner seat 22 through the second upper liquid channel 51, the first annular cavity 42 and the first upper liquid channel 41 to cool and lubricate the bearing 1, and then flows out of the barrel cavity 223 of the inner seat 22 through the lower liquid channel 2221 to take away the heat generated by the support unit 100 and the screw 1; the first upper liquid channel 41 of this embodiment has a first liquid-throwing section 413, so when the screw 500 rotates, the coolant in the first upper liquid channel 41 can be cooled at a higher temperature under the action of centrifugal force. The coolant is sprayed toward the bearing 1 at a high speed, which is beneficial to speed up the flow rate of the coolant in the barrel cavity 223 of the inner seat 22, and is beneficial to the coolant to quickly take away the heat at the support of the screw rod 500; and, since the lower liquid channel 2221 is arranged on the positioning ring 222, the coolant can also be thrown out of the barrel cavity 223 of the inner seat 22 through the lower liquid channel 2221 under the action of centrifugal force, which is further beneficial to speed up the circulation rate of the coolant in the barrel cavity 223 of the inner seat 22, and is further beneficial to the coolant to quickly take away the heat at the support of the screw rod 500, which is beneficial to ensure that the screw rod 500 is in good operating condition.

[0063] Alternatively, in other embodiments of the present invention, the lower liquid structure may also only be provided with a lower liquid channel 2221 that radially penetrates the bearing seat 2, which can also achieve the purpose of the invention.

[0064] Preferably, an upper liquid one-way valve (not shown in the figure) is provided at the liquid inlet of the second upper liquid channel 51, which is beneficial to prevent the coolant in the first upper liquid channel 41 from being thrown toward the second upper liquid channel 51 under the action of centrifugal force, and to prevent the coolant from flowing in the opposite direction of the upper liquid direction; and, in this way, after the coolant in the first upper liquid channel 41 is thrown toward the bearing 1 through the first throwing section 413, a negative pressure suction force can be generated in the first throwing section 413, and then the coolant is sucked from the external liquid source through the second upper liquid channel 51 through the negative pressure suction force. Therefore, without the need for an external liquid source to provide pressure, the coolant can be quickly circulated in the barrel cavity 223 of the inner seat 22, thereby achieving rapid cooling of the support of the screw rod 500 and ensuring that the screw rod 500 operates well.

[0065] Alternatively, in other embodiments of the present invention, the upper liquid one-way valve may also be disposed on an external liquid path connected to the second upper liquid channel 51, which can also achieve the purpose of the invention.

[0066] Preferably, please refer to Figure 3 The cross-sectional area of ​​the first liquid-throwing section 413 is smaller than the cross-sectional area of ​​other sections of the first upper liquid channel 41, and the cross-sectional area of ​​the first liquid-throwing section 413 is smaller than the cross-sectional area of ​​the second upper liquid channel 51, which is further beneficial for accelerating the coolant to be thrown out through the first liquid-throwing section 413, and further beneficial for improving the circulation rate of the coolant in the cylinder cavity of the inner seat 22.

[0067] Preferably, please refer to Figure 3 The end of the first movable end cover 4 close to the bearing 1 has an oblique end surface 44 facing the bearing 1, and the liquid outlet of the first liquid-spinning section 413 is located on the oblique end surface 44. This is conducive to machining the first liquid-spinning section 413 by drilling, which is conducive to reducing the machining difficulty of the first liquid-spinning section 413; more preferably, the depth direction of the first liquid-spinning section 413 is along the normal direction of the oblique end surface 44.

[0068] Please refer to Figure 3The outer peripheral wall surface of the first movable end cover 4 is a cylindrical surface, and the inner peripheral wall surface of the first fixed end cover 5 is a cylindrical surface. The first annular cavity 42 is formed between the outer peripheral wall surface of the first movable end cover 4 and the inner peripheral wall surface of the first fixed end cover 5. There is a gap between the outer peripheral wall surface of the first movable end cover 4 and the inner peripheral wall surface of the first fixed end cover 5. This is conducive to avoiding the friction between the first movable end cover 4 and the first fixed end cover 5 to affect the running performance of the screw 500. Preferably, there is also a gap around the outer peripheral wall surface of the first movable end cover 4 and the inner peripheral wall surface of the first fixed end cover 5. The second annular cavity 43 around the movable end cover 4 is along the axial direction X of the screw rod 500. The second annular cavity 43 is located on the side of the first annular cavity 42 that is away from the bearing 1, and the wall surface of the second annular cavity 43 close to the bearing 1 is a step surface. In this way, when external debris invades between the first movable end cover 4 and the first fixed end cover 5, it can be accommodated in the second annular cavity 43, which is beneficial to prevent external debris from invading the barrel cavity 223 of the inner seat 22, preventing external debris from affecting the operation of the bearing 1, and ensuring the smooth operation of the screw rod 500.

[0069] In the present embodiment, the inner circumferential wall surface of the first fixed end cover 5 and the outer circumferential wall surface of the first movable end cover are the bonding surfaces. Optionally, in other embodiments of the present invention, the bonding surface between the first upper liquid structure and the second upper liquid structure may not be the main surface. For example, the bonding surface between the first upper liquid structure and the second upper liquid structure may be the end surface normal to the axial direction X of the screw rod 500, or the bonding surface between the first upper liquid structure and the second upper liquid structure may also be a conical surface. Of course, at this time, the second annular cavity 43 is not necessarily located on the side of the first annular cavity 42 that is away from the bearing 1 along the axial direction X, as long as the second annular cavity 43 is located on the liquid leakage side of the first annular cavity 42. The so-called liquid leakage side is the side where the coolant in the first annular cavity 42 leaks along the gap between the first movable end cover 4 and the first fixed end cover 5. For example, the liquid leakage side of the first annular cavity 42 in the present embodiment is the side away from the bearing 1 along the direction X.

[0070] Please refer to Figures 6 to 8 Preferably, a spiral groove is provided on the outer peripheral wall of the inner seat 22, and the spiral groove forms a first cooling channel 221 between the outer seat 21 and the inner seat 22. The outer seat 21 has a coolant inlet 224 and a coolant outlet 225 radially penetrating the first cooling channel 221. The coolant is introduced into the first cooling channel 221 through the coolant inlet 224 and the coolant outlet 225. The coolant flowing through the first cooling channel 221 is conducive to taking away the heat of the bearing seat 2, and further conducive to ensuring that the screw 500 operates well.

[0071] Preferably, along the axial direction X of the screw rod 500 , both sides of the first cooling channel 221 are provided with sealing rings 9 , and the sealing rings 9 are squeezed between the outer seat 21 and the inner seat 22 . This is conducive to preventing the coolant from leaking from the first cooling channel 221 .

[0072] Optionally, in other embodiments of the present invention, the spiral groove may also be formed on the inner circumferential wall of the outer seat 21. Of course, it is preferred to form the spiral groove on the outer circumferential wall of the inner seat 22, which helps to reduce the difficulty of processing the spiral groove.

[0073] Optionally, in other embodiments of the present invention, the first cooling channel 221 may also be formed by grooves of other shapes, such as a grid-like groove formed by interweaving circumferential and axial grooves. Of course, the spiral groove is beneficial to guiding the coolant to flow sequentially, and is beneficial to sequentially guiding the coolant to flow into and out of the first cooling channel 221, which is beneficial to avoiding high-temperature coolant from being retained in the first cooling channel 221, and further beneficial to the rapid cooling of the bearing seat 2.

[0074] For details, please refer to Fig. 9 The fixing part 211 is located on the outer seat 21, and the fixing part 211 has a second cooling channel 2111, and the second cooling channel 2111 has its corresponding inlet and outlet. This helps to prevent the heat of the motor 200 from being transferred to the bearing seat 2 through the fixing part 211, and then transferred to the bearing 1, which helps to prevent the heat of the motor 200 from affecting the operation of the screw 500.

[0075] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A shaft assembly, comprising a shaft and a support unit, wherein the support unit comprises a bearing seat, the shaft is supported on the bearing seat through a bearing, the bearing seat has a barrel cavity, and the bearing is located in the barrel cavity; Features: Along the axial direction of the rotating shaft, at least one side of the bearing has a first upper liquid structure and a second upper liquid structure, the first upper liquid structure is fixed to the rotating shaft, the second upper liquid structure is fixed to the bearing seat, a first annular cavity surrounding the rotating shaft is formed between the first upper liquid structure and the second upper liquid structure, the first upper liquid structure has a first upper liquid channel, the second upper liquid structure has a second upper liquid channel, and the first upper liquid channel and the second upper liquid channel are both connected to the first annular cavity; The first upper liquid channel has a first liquid-throwing section with a liquid outlet facing the bearing, and the direction from the first upper liquid structure to the bearing is axially directed from the first upper liquid structure. The first liquid-throwing section is located at the front end of the first upper liquid structure, and the first liquid-throwing section is inclined radially outward. The first upper liquid structure and the second upper liquid structure are gap-matched, a second annular cavity for accommodating external intrusions is formed between the first upper liquid structure and the second upper liquid structure, and the second annular cavity is located on the liquid leakage side of the first annular cavity; The wall surface of the second annular cavity close to the first annular cavity is a step surface.

2. The shaft assembly according to claim 1, characterized in that: Along the axial direction of the rotating shaft, the first upper liquid structure abuts against the inner ring of the bearing, and / or the second upper liquid structure abuts against the outer ring of the bearing.

3. The shaft assembly according to claim 1, characterized in that: The first annular cavity is formed by an annular groove formed on the outer peripheral wall of the first upper liquid structure.

4. The shaft assembly according to claim 1, characterized in that: The rotating shaft is a screw shaft.

5. The shaft assembly according to claim 1, characterized in that: The support unit further comprises a lower liquid structure, which is located on a side of the bearing away from the first upper liquid structure and the second upper liquid structure along the axial direction of the rotating shaft; The lower liquid structure is fixed to the bearing seat, and the lower liquid structure has a lower liquid channel, and the lower liquid channel has a second liquid throwing section extending in the radial direction.

6. The shaft assembly according to claim 1, characterized in that: The end of the first liquid-uploading structure close to the bearing has an inclined end surface facing the bearing, the liquid outlet of the first liquid-throwing section is located on the inclined end surface, and the depth direction of the first liquid-throwing section is along the normal direction of the inclined end surface.

7. The shaft assembly according to any one of claims 1 to 6, characterized in that: The bearing seat comprises an outer seat and an inner seat, the inner seat is cylindrical, the outer seat is fixedly sleeved on the outer periphery of the inner seat, and the bearing is arranged in the cylindrical cavity of the inner seat; A first cooling channel is formed between the outer seat and the inner seat, and the first cooling channel has a cooling liquid inlet and a cooling liquid outlet.

8. The shaft assembly according to claim 7, characterized in that: The cooling liquid inlet and the cooling liquid outlet are both arranged on the outer seat.

9. The shaft assembly according to claim 7, characterized in that: The first cooling channel is arranged around the outer peripheral wall of the inner seat, and the first cooling channel extends spirally along the axial direction of the rotating shaft.

10. The shaft assembly according to claim 7, characterized in that: Along the axial direction of the rotating shaft, both sides of the first cooling channel are provided with sealing rings, and the sealing rings are squeezed between the outer seat and the inner seat.

11. The shaft assembly according to any one of claims 1 to 6, characterized in that: The cross-sectional area of ​​the first liquid-throwing section is smaller than the cross-sectional area of ​​other positions of the first upper liquid channel; The cross-sectional area of ​​the first liquid-spinning section is smaller than the cross-sectional area of ​​the second upper liquid channel.

12. The shaft assembly according to any one of claims 1 to 6, characterized in that: An upper liquid one-way valve is provided at the liquid inlet of the second upper liquid channel, or an upper liquid one-way valve is provided on the external liquid path communicated with the second upper liquid channel.

13. A transmission system, including a motor, characterized in that: It also includes a rotating shaft assembly as described in any one of claims 1 to 12, wherein the rotating shaft is drivingly connected to the output shaft of the motor.

14. The transmission system according to claim 13, characterized in that: The bearing seat has a fixing portion, the fixing portion is fixedly connected to the housing of the motor, and the fixing portion has a second cooling channel.

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