CN111473053A - Rotating shaft assembly and transmission system - Google Patents

Abstract

The invention relates to the field of installation and support of rotating shafts, and provides a rotating shaft assembly and a transmission system. The rotating shaft assembly comprises a supporting unit and a rotating shaft, the supporting unit comprises 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 is provided with a first liquid feeding structure and a second liquid feeding structure, the first liquid feeding structure is fixed with the rotating shaft, the second liquid feeding structure is fixed with the bearing seat, a first annular cavity which surrounds the rotating shaft for a circle is formed between the first liquid feeding structure and the second liquid feeding structure, the first liquid feeding structure is provided with a first liquid feeding channel, the second liquid feeding structure is provided with a second liquid feeding channel, and the first liquid feeding channel and the second liquid feeding channel are both communicated to the first annular cavity; the first liquid feeding channel is provided with a first liquid throwing section of which the liquid outlet faces the bearing, the first liquid throwing section is located at the front end of the first liquid feeding structure along the axial direction of the rotating shaft from the direction of the first liquid feeding structure to the bearing, and the first liquid throwing section inclines towards the radial outer side. The heat dissipation efficiency of the rotating shaft assembly is improved, and the rotating shaft is guaranteed to operate well.

Description

Rotating shaft assembly and transmission system

Technical Field

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

Background

The ball screw nut pair is easy to generate more heat when running at high speed, and the main heat generating sources of the ball screw nut pair comprise the matching position of the nut and the screw rod and the supporting position of the screw rod.

In order to reduce the temperature of the ball screw nut pair at the screw bearing position, a cooling structure is provided at the screw bearing position in the prior art, and the cooling liquid is conducted through the cooling structure.

Some prior art locate the cooling structure on the lead screw, form the passageway of carrying the coolant liquid through processing the cavity hole for the lead screw, however, the degree of difficulty of processing the passageway of carrying the coolant liquid on the lead screw is great to easily influence the structural strength of lead screw.

Other prior art techniques have cooling structures on the bearing blocks that support the lead screws, however, such bearings have poor cooling performance.

Disclosure of Invention

One of the objects of the present invention is to provide a rotary shaft assembly having excellent cooling effect.

In order to achieve the above object, the rotating shaft assembly provided by the present invention comprises a supporting unit and a rotating shaft, wherein the supporting unit comprises a bearing seat, the rotating shaft is supported on the bearing seat through a bearing, the bearing seat is provided with a cylinder cavity, and the bearing is positioned in the cylinder cavity; along the axial direction of the rotating shaft, at least one side of the bearing is provided with a first liquid feeding structure and a second liquid feeding structure, the first liquid feeding structure is fixed with the rotating shaft, the second liquid feeding structure is fixed with the bearing seat, a first annular cavity which surrounds the rotating shaft for a circle is formed between the first liquid feeding structure and the second liquid feeding structure, the first liquid feeding structure is provided with a first liquid feeding channel, the second liquid feeding structure is provided with a second liquid feeding channel, and the first liquid feeding channel and the second liquid feeding channel are both communicated to the first annular cavity; the first liquid feeding channel is provided with a first liquid throwing section of which the liquid outlet faces the bearing, the first liquid throwing section is located at the front end of the first liquid feeding structure along the axial direction of the rotating shaft from the direction of the first liquid feeding structure to the bearing, and the first liquid throwing section inclines towards the radial outer side.

Therefore, through the structural design of the rotating shaft assembly, the cooling liquid is supplied to the first upper liquid channel by externally connecting the second upper liquid channel with the cooling liquid, and the first upper liquid channel is provided with the first liquid throwing section, so that the cooling liquid is sprayed to the bearing from the first liquid throwing section under the action of the centrifugal force of the rotating shaft, the circulation rate of the cooling liquid in the cavity of the bearing seat barrel is favorably improved, the heat generated at the supporting position of the rotating shaft is favorably and quickly taken away, the heat dissipation efficiency of the rotating shaft assembly is favorably improved, and the rotating shaft is favorably ensured to run well; in addition, the hollow liquid feeding hole path does not need to be processed on the rotating shaft, so that the structural strength of the rotating shaft is favorably improved, and the processing difficulty of the liquid feeding channel is favorably reduced.

Preferably, the first hydrodynamic structure abuts against an inner ring of the bearing and/or the second hydrodynamic structure abuts against an outer ring of the bearing in the axial direction of the rotating shaft.

It is from top to bottom visible, go up liquid structure and second like this and go up liquid structure and provide axial positioning for the inner and outer lane of bearing respectively, be favorable to reducing the part quantity of pivot subassembly, be favorable to the simple structure of pivot subassembly.

In another preferred embodiment, the first annular chamber is formed by an annular groove formed in the outer peripheral wall of the first liquid-feeding structure.

Therefore, the processing difficulty of the first annular cavity is reduced.

Still another preferred scheme is that the first liquid feeding structure and the second liquid feeding structure are in clearance fit, a second annular cavity is formed between the first liquid feeding structure and the second liquid feeding structure, and the second annular cavity is located on the liquid leakage side of the first annular cavity.

Therefore, the bearing seat is beneficial to preventing external sundries from entering the cylinder cavity of the bearing seat and preventing the external sundries from influencing the operation of the bearing.

The further scheme is that the wall surface of the second annular cavity close to one side of the first annular cavity is a step surface.

Therefore, the capacity of the second annular cavity for retaining external sundries is further improved.

In another preferred embodiment, the rotating shaft is a screw shaft.

In a further preferred embodiment, the support unit further comprises a lower fluid structure, which is located on a side of the bearing facing away from the first upper fluid structure and the second upper fluid structure in the axial direction of the rotating shaft; the lower liquid structure is fixed with the bearing seat, the lower liquid structure is provided with a lower liquid channel, and the lower liquid channel is provided with a second liquid throwing section extending along the radial direction.

From top to bottom, be favorable to forming the passageway of coolant liquid circulation like this to the setting up of second liquid throwing section is favorable to the coolant liquid to flow out with higher speed in the barrel cavity of bearing frame, further is favorable to promoting the circulation rate of coolant liquid in the barrel cavity of bearing frame, further is favorable to the quick heat dissipation of pivot subassembly.

Still another preferred scheme is that the one end that is close to the bearing of first structure of getting liquid has the inclined end face towards the bearing, and the liquid outlet of first liquid throwing section is located the inclined end face, and the depth direction of first liquid throwing section is along the normal direction of inclined end face.

It is thus clear that the processing degree of difficulty of reducing first liquid throwing section is favorable to like this.

In another preferred scheme, the bearing seat comprises an outer seat and an inner seat, the inner seat is cylindrical, the outer seat is fixedly sleeved on the periphery of the inner seat, and the bearing is arranged in a cylindrical cavity of the inner seat; a first cooling channel is formed between the outer seat and the inner seat and is provided with a cooling liquid inlet and a cooling liquid outlet.

It is thus clear that like this through letting in the coolant liquid to first cooling channel, be favorable to cooling the bearing frame, further be favorable to the quick heat dissipation of pivot subassembly, further be favorable to the pivot operation smooth and easy.

The further proposal is that the cooling liquid inlet and the cooling liquid outlet are both arranged on the outer seat.

The further scheme is that the first cooling channel is arranged around the peripheral wall of the inner seat, and the first cooling channel spirally extends along the axial direction of the rotating shaft.

It is thus clear that, be favorable to guiding the coolant liquid sequence like this and flow, be favorable to the sequence to guide the coolant liquid to flow in and flow out first cooling channel, be favorable to avoiding high temperature coolant liquid to be detained in first cooling channel, further be favorable to bearing frame rapid cooling.

The further scheme is that sealing rings are arranged on two sides of the first cooling channel along the axial direction of the rotating shaft and are extruded between the outer seat and the inner seat.

As can be seen from the above, this is advantageous for avoiding leakage of the cooling liquid in the first cooling channel.

Still another preferred scheme is that the cross-sectional area of the first liquid throwing section is smaller than the cross-sectional area of the other positions of the first upper liquid channel; the cross-sectional area of the first liquid throwing section is smaller than that of the second upper liquid channel.

Still another preferred scheme is that a liquid feeding one-way valve is arranged at a liquid inlet of the second liquid feeding channel, or a liquid feeding one-way valve is arranged on an external liquid path communicated with the second liquid feeding channel.

Therefore, the coolant in the first upper liquid channel is prevented from being thrown to the second upper liquid channel under the action of centrifugal force, and the coolant is prevented from flowing in the direction opposite to the upper liquid direction; and like this, coolant liquid in the liquid passageway on first gets rid of the liquid section through first gets rid of and gets rid of to the bearing after, can produce negative pressure suction at the liquid section of first getting rid of, and then gets up liquid passageway through the second through negative pressure suction and follow external liquid source suction coolant liquid, therefore need not external liquid source and provide pressure and just can realize coolant liquid fast circulation in the barrel cavity of bearing frame, just can realize the quick cooling to the rotating shaft subassembly, just can guarantee that the rotating shaft operates well.

The invention also aims to provide a transmission system with good cooling effect.

In order to achieve the purpose, the transmission system provided by the invention comprises a motor and the rotating shaft assembly, wherein the rotating shaft is in transmission connection with an output shaft of the motor.

Therefore, due to the adoption of the rotating shaft assembly, the supporting position of the rotating shaft is favorably and quickly cooled, and the rotating shaft can smoothly run.

Preferably, the bearing seat has a fixing portion, the fixing portion is fixedly connected with a casing of the motor, and the fixing portion has a second cooling channel.

Therefore, the heat of the motor is prevented from being conducted to the bearing seat through the fixing part and then conducted to the bearing, and the heat of the motor is prevented from influencing the operation of the rotating shaft.

Drawings

FIG. 1 is a block diagram of an embodiment of the transmission system of the present invention;

FIG. 2 is a partial cross-sectional view of the first upper fluid passage 41 and the axis of the lead screw 500 of an embodiment of the transmission system of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

FIG. 5 is a structural view of the first movable cover 4 in the rotary shaft assembly of the present invention;

FIG. 6 is a partial cross-sectional view of the subcooled liquid inlet 224, the coolant outlet and the axis of the lead screw 500 of the transmission system embodiment of the present invention;

FIG. 7 is an enlarged view of a portion of FIG. 6 at C;

fig. 8 is a structural view of the inner seat 22 in the rotary shaft assembly of the present invention;

fig. 9 is a sectional view of the fixed portion 211 of the rotary shaft assembly of the present invention taken in the direction X in the normal direction.

Detailed Description

Pivot subassembly and transmission system embodiment:

referring to fig. 1 to 5, the transmission system of the present embodiment includes a motor 200 and a rotating shaft assembly of the present embodiment, the motor 200 includes a casing 201 and an output shaft 202, the rotating shaft assembly includes a screw rod 500 and a supporting unit 100, 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 lock nut 8 and a second lock nut 6.

Referring to fig. 1, the screw 500 of the present embodiment is a rotating shaft, the support unit 100 includes two support units, the two support units are the support unit 100a and the support unit 100b, the support unit 100a and the support unit 100b are respectively supported at two ends X in the axial direction of the screw 500, the output shaft 202 of the motor 200 is fixedly connected to one end of the screw 500 supported by the support unit 100a through the coupling 400, the bearing seat 2 of the support unit 100a has a fixing portion 211, the bearing seat 2 of the support unit 100b has no fixing portion 211, the fixing portion 211 is fixedly connected to the housing 201 of the motor 200 through the screw 3, and the main body structures of the support unit 100a and the support unit 100b are the same.

Alternatively, in other embodiments of the present invention, the rotating shaft may be other than the screw 500.

Referring to fig. 2, the bearing seat 2 includes an inner seat 22 and an outer seat 21, the outer seat 21 is fixedly sleeved on the circumferential 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, and the screw rod 500 is supported on the inner wall of the cylindrical cavity 223 of the inner seat 22 through the bearing 1.

Referring to fig. 2, the first locking nut 8 and the second locking nut 6 are respectively in threaded connection with the screw rod 500, and the first fixed end cap 5 is fixedly connected with the inner seat 22 through a screw.

Referring to fig. 2, along the axial direction X of the screw rod 500, one end of the inner seat 22 has a positioning ring 222 protruding inward in the radial direction, the positioning ring 222, the outer ring of the bearing 1 and the first fixing end cap 5 are sequentially abutted, and the first locking nut 8, the second moving end cap 7, the inner ring of the bearing 1, the first moving end cap 4 and the second locking nut 6 are sequentially abutted and fixed.

Referring to fig. 3 and 5, a first annular cavity 42 surrounding the screw rod 500 is formed between the first movable end cap 4 and the first fixed end cap 5, and specifically, the first annular cavity 42 is formed by an annular groove formed on the outer peripheral wall of the first movable end cap 4.

Referring to fig. 3, the first movable end cap 4 of the present embodiment is a first liquid feeding structure, the first movable end cap 4 has a first liquid feeding channel 41, the first liquid feeding channel 41 includes a first radial section 411, a first axial section 412 and a first liquid throwing section 413 which are sequentially connected, the first radial section 411 is directly connected to the first annular cavity 42, the first liquid throwing section 413 is located at the front end of the first movable end cap 4 along the axial direction X of the screw rod 500, the first liquid throwing section 413 is inclined toward the radial outer side, and a liquid outlet of the first liquid throwing section 413 faces the bearing 1.

Referring to fig. 3, the first fixing end cap 5 of the present embodiment is a second liquid feeding structure, the first fixing end cap 5 has a second liquid feeding channel 51, the second liquid feeding channel 51 includes a second radial segment 511, a second axial segment 512 and a third radial segment 513 sequentially connected, the second radial segment 511 is connected to the outside of the first fixing end cap 5, and the third radial segment 513 is connected to the first annular cavity 42.

Alternatively, in other embodiments of the present invention, the first fluid application structure may be formed integrally with the screw rod 1, and the second fluid application structure may be formed integrally with the inner seat 22, which is not favorable for machining the first fluid application channel 41 on the first fluid application structure, and is also favorable for machining the second fluid application channel 51 on the second fluid application structure, so that the first fluid application structure is preferably disposed separately from the screw rod 500, and the second fluid application structure is preferably disposed separately from the inner seat 22.

Alternatively, in other embodiments of the invention, the axial positioning of the bearing 1 can be achieved by other structures, the first and second hydraulic structures being used only for introducing the cooling fluid into the cylinder chamber 223 of the inner seat 22.

Alternatively, in other embodiments of the present invention, the inner ring of the bearing 1 is in interference fit with the screw rod 500, the outer ring of the bearing 1 is in interference fit with the inner seat 22, and when the bearing 1 is not subjected to axial load, and the bearing 1 does not need to be axially limited, the first movable end cap 4 and the first fixed end cap 5 may not have the effect of axially limiting the position of the bearing 1.

Of course, the cooling fluid introduced into the cylindrical cavity 223 of the inner seat 22 preferably also has a lubricating function.

Referring to fig. 4, the positioning ring 222 is of a liquid discharging structure, the positioning ring 222 has a liquid discharging passage 2221, the liquid discharging passage 2221 includes a third axial section 22211 and a fourth radial section 22212 which are sequentially communicated, the third axial section 22211 of the present embodiment is a second liquid throwing section, the third axial section 22211 is communicated with the cylinder cavity 223 of the inner seat 22, and the fourth radial section 22212 is communicated with the axial outside of the inner seat 22.

Alternatively, in other embodiments of the present invention, the liquid draining structure may be disposed separately from the inner seat 22, and the liquid draining structure is fixedly connected to the inner seat 22, which also achieves the object of the present invention.

When the transmission system operates, the motor 200 drives the screw rod 500 to rotate, the cooling liquid enters the cylinder 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 cylinder cavity 223 of the inner seat 22 through the lower liquid channel 2221 to take away heat generated by the support unit 100 and the screw rod 1; because the first upper fluid channel 41 of the present embodiment has the first fluid-throwing segment 413, when the screw rod 500 rotates, the cooling fluid in the first upper fluid channel 41 can be sprayed to the bearing 1 at a high speed under the action of centrifugal force, which is beneficial to increasing the flow rate of the cooling fluid in the cylinder cavity 223 of the inner seat 22 and being beneficial to the cooling fluid to quickly take away the heat at the supporting position of the screw rod 500; moreover, since the draining passage 2221 is disposed on the positioning ring 222, the cooling liquid can be thrown out of the cylindrical cavity 223 of the inner seat 22 through the draining passage 2221 under the action of centrifugal force, which is further beneficial to increasing the circulation rate of the cooling liquid in the cylindrical cavity 223 of the inner seat 22, and further beneficial to rapidly taking away the heat at the supporting position of the screw rod 500 by the cooling liquid, thereby being beneficial to ensuring that the running state of the screw rod 500 is good.

Alternatively, in other embodiments of the present invention, the draining structure may be provided with only the draining passage 2221 radially penetrating the bearing housing 2, which also achieves the object of the present invention.

Preferably, a liquid feeding check valve (not shown) is arranged at the liquid inlet of the second liquid feeding channel 51, so that the coolant in the first liquid feeding channel 41 is prevented from being thrown to the second liquid feeding channel 51 under the action of centrifugal force, and the coolant is prevented from flowing in the direction opposite to the liquid feeding direction; in addition, after the coolant in the first upper fluid channel 41 is thrown to the bearing 1 through the first fluid throwing section 413, negative pressure suction can be generated in the first fluid throwing section 413, and then the coolant is sucked from an external fluid source through the second upper fluid channel 51 through the negative pressure suction, so that the coolant can rapidly circulate in the barrel cavity 223 of the inner seat 22 without the pressure provided by the external fluid source, the support of the screw rod 500 can be rapidly cooled, and the good operation of the screw rod 500 can be ensured.

Alternatively, in other embodiments of the present invention, the upper fluid check valve may be disposed on an external fluid path communicating with the second upper fluid passage 51, which also achieves the object of the present invention.

Preferably, referring to fig. 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, so as to further facilitate the accelerated throwing of the cooling liquid through the first liquid throwing section 413, and further facilitate the increase of the circulation rate of the cooling liquid in the barrel cavity of the inner seat 22.

Preferably, referring to fig. 3, one end of the first movable end cover 4 close to the bearing 1 has an inclined end surface 44 facing the bearing 1, and the liquid outlet of the first liquid throwing segment 413 is located on the inclined end surface 44. Therefore, the first liquid throwing section 413 can be machined in a drilling mode, and the machining difficulty of the first liquid throwing section 413 can be reduced; more preferably, the depth direction of the first slinger segment 413 is normal to said inclined end face 44.

Referring to fig. 3, the outer peripheral wall surface of the first movable end cap 4 is a cylindrical surface, the inner peripheral wall surface of the first fixed end cap 5 is a cylindrical surface, the first annular cavity 42 is formed between the outer peripheral wall surface of the first movable end cap 4 and the inner peripheral wall surface of the first fixed end cap 5, and a gap is formed between the outer peripheral wall surface of the first movable end cap 4 and the inner peripheral wall surface of the first fixed end cap 5, so as to prevent the first movable end cap 4 and the first fixed end cap 5 from being rubbed to affect the operation performance of the screw rod 500, preferably, a second annular cavity 43 surrounding the first movable end cap 4 is further provided between the outer peripheral wall surface of the first movable end cap 4 and the inner peripheral wall surface of the first fixed end cap 5, the second annular cavity 43 is located on a side of the first annular cavity 42 facing away from the bearing 1 along the axial direction X of the screw rod 500, and a wall surface of the second annular cavity 43 near the bearing 1 side is a stepped surface, so that when external impurities intrude, can be accommodated in the second annular cavity 43, which is beneficial to preventing external impurities from invading into the cylindrical cavity 223 of the inner seat 22, preventing the external impurities from influencing the operation of the bearing 1, and being beneficial to ensuring the smooth operation of the screw rod 500.

In this embodiment, the inner peripheral wall surface of the first stationary cover 5 and the outer peripheral wall surface of the first movable cover are combined surfaces, and, alternatively, in other embodiments of the present invention, the bonding surface of the first liquid applying structure and the second liquid applying structure may not be a main surface, for example, the combination surface of the first liquid applying structure and the second liquid applying structure can be an end surface which is normal along the axial direction X of the screw rod 500, or the joint surface of the first liquid feeding structure and the second liquid feeding structure may be a conical surface, of course, in this case, the second annular cavity 43 is not necessarily located on the side of the first annular cavity 42 facing away from the bearing 1 in 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, that is, the side where the cooling liquid leaks when the cooling liquid 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 chamber 42 in this embodiment is the side facing away from the bearing 1 in the direction X.

Referring to fig. 6 to 8, preferably, the outer circumferential wall of the inner seat 22 is provided with a spiral groove forming a first cooling channel 221 between the outer seat 21 and the inner seat 22, and the outer seat 21 has a cooling fluid inlet 224 and a cooling fluid outlet 225 penetrating to the first cooling channel 221 in a radial direction. The cooling liquid is introduced into the first cooling channel 221 through the cooling liquid inlet 224 and the cooling liquid outlet 225, and the cooling liquid flows through the first cooling channel 221, so that the heat of the bearing seat 2 can be taken away, and the screw rod 500 can be ensured to operate well.

Preferably, the first cooling channel 221 has a sealing ring 9 on both sides in the axial direction X of the screw 500, the sealing ring 9 being compressed between the outer seat 21 and the inner seat 22. This is advantageous in preventing the coolant from leaking from the first cooling passage 221.

Alternatively, in other embodiments of the present invention, the spiral groove may be opened on the inner circumferential wall of the outer seat 21, but it is preferable to open the spiral groove on the outer circumferential wall of the inner seat 22, which is favorable for reducing the difficulty of processing the spiral groove.

Alternatively, in other embodiments of the present invention, the first cooling channel 221 may be formed by channels with other shapes, such as a grid-shaped channel formed by interweaving two types of channels in the circumferential direction and the axial direction, and the spiral groove is favorable for guiding the cooling liquid to flow in sequence, is favorable for guiding the cooling liquid to flow into and flow out of the first cooling channel 221 in sequence, is favorable for avoiding the high-temperature cooling liquid to be retained in the first cooling channel 221, and is further favorable for cooling the bearing seat 2 quickly.

Specifically, referring to fig. 9, the fixing portion 211 is located on the outer seat 21, the fixing portion 211 has a second cooling channel 2111, and the second cooling channel 2111 has an inlet and an outlet corresponding thereto. This is favorable to avoiding the heat of motor 200 to conduct to bearing frame 2 through fixed part 211, then conducts to bearing 1 department, is favorable to avoiding the operation that the heat of motor 200 influences lead screw 500.

Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, rather than limitations, and that many variations and modifications of the invention are possible to those skilled in the art, without departing from the spirit and scope of the invention.

Claims (16)

1. The rotating shaft assembly comprises a rotating shaft and a supporting unit, the supporting unit comprises a bearing seat, the rotating shaft is supported on the bearing seat through a bearing, the bearing seat is provided with a barrel cavity, and the bearing is positioned in the barrel cavity;

the method is characterized in that:

along the axial direction of the rotating shaft, at least one side of the bearing is provided with a first liquid feeding structure and a second liquid feeding structure, the first liquid feeding structure is fixed with the rotating shaft, the second liquid feeding structure is fixed with the bearing seat, a first annular cavity surrounding the rotating shaft for one circle is formed between the first liquid feeding structure and the second liquid feeding structure, the first liquid feeding structure is provided with a first liquid feeding channel, the second liquid feeding structure is provided with a second liquid feeding channel, and the first liquid feeding channel and the second liquid feeding channel are both communicated to the first annular cavity;

the first upper liquid channel is provided with a liquid outlet facing a first liquid throwing section of the bearing, the first upper liquid structure points to the direction of the bearing along the axial direction of the rotating shaft, the first liquid throwing section is located at the front end of the first upper liquid structure, and the first liquid throwing section inclines towards the radial outer side.

2. The spindle assembly of claim 1, wherein:

along the axial direction of the rotating shaft, the first liquid feeding structure is abutted with the inner ring of the bearing, and/or the second liquid feeding structure is abutted with the outer ring of the bearing.

3. The spindle assembly of claim 1, wherein:

the first annular cavity is formed by an annular groove formed in the outer peripheral wall of the first liquid feeding structure.

4. The spindle assembly of claim 1, wherein:

the first liquid feeding structure and the second liquid feeding structure are in clearance fit, a second annular cavity is formed between the first liquid feeding structure and the second liquid feeding structure, and the second annular cavity is located on the liquid leakage side of the first annular cavity.

5. The spindle assembly of claim 4, wherein:

the wall surface of the second annular cavity close to one side of the first annular cavity is a step surface.

6. The spindle assembly of claim 1, wherein:

the rotating shaft is a screw rod shaft.

7. The spindle assembly of claim 1, wherein:

the supporting unit further comprises a lower liquid structure, and the lower liquid structure is positioned on one side of the bearing, which is far 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 with the bearing seat, the lower liquid structure is provided with a lower liquid channel, and the lower liquid channel is provided with a second liquid throwing section extending along the radial direction.

8. The spindle assembly of claim 1, wherein:

one end of the first upper liquid structure, which is close to the bearing, is provided with an inclined end face facing the bearing, a liquid outlet of the first liquid throwing section is positioned on the inclined end face, and the depth direction of the first liquid throwing section is along the normal direction of the inclined end face.

9. A spindle assembly according to any one of claims 1 to 8, wherein:

the bearing seat comprises an outer seat and an inner seat, the inner seat is cylindrical, the outer seat is fixedly sleeved on the periphery of the inner seat, and the bearing is arranged in a cylinder cavity of the inner seat;

a first cooling channel is formed between the outer seat and the inner seat and is provided with a cooling liquid inlet and a cooling liquid outlet.

10. The spindle assembly of claim 9, wherein:

the cooling liquid inlet and the cooling liquid outlet are both arranged on the outer seat.

11. The spindle assembly of claim 9, wherein:

the first cooling channel is arranged around the peripheral wall of the inner seat, and the first cooling channel extends spirally along the axial direction of the rotating shaft.

12. The spindle assembly of claim 9, wherein:

and sealing rings are arranged on two sides of the first cooling channel along the axial direction of the rotating shaft and are extruded between the outer seat and the inner seat.

13. A spindle assembly according to any one of claims 1 to 8, wherein:

the cross sectional area of the first liquid throwing section is smaller than that of other positions of the first upper liquid channel;

the cross-sectional area of the first liquid throwing section is smaller than that of the second upper liquid channel.

14. A spindle assembly according to any one of claims 1 to 8, wherein:

and a liquid feeding one-way valve is arranged at the liquid inlet of the second liquid feeding channel, or a liquid feeding one-way valve is arranged on an external liquid path communicated with the second liquid feeding channel.

15. Transmission system, including the motor, its characterized in that:

a spindle assembly as claimed in any one of claims 1 to 14, the spindle being in driving connection with an output shaft of the motor.

16. The transmission system of claim 15, wherein:

the bearing seat is provided with a fixing part, the fixing part is fixedly connected with a shell of the motor, and the fixing part is provided with a second cooling channel.

Images