CN115276323A

CN115276323A - Single-bearing water-cooling hub motor

Info

Publication number: CN115276323A
Application number: CN202211178986.2A
Authority: CN
Inventors: 胡林旭; 刘雪波
Original assignee: Changsha Long Electrical Co ltd
Current assignee: Changsha Long Electrical Co ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2022-11-01
Anticipated expiration: 2042-09-27
Also published as: CN115276323B

Abstract

The invention discloses a single-bearing water-cooling hub motor, which particularly relates to the technical field of motors and comprises a hub outer frame, wherein a sealing cover is fixedly arranged at the top end of the hub outer frame in a sealing mode through bolts, and a hub electric machine part is arranged in the hub outer frame.

Description

Single-bearing water-cooling hub motor

Technical Field

The invention relates to the technical field of motors, in particular to a single-bearing water-cooling hub motor.

Background

The hub motor is designed by integrating a power system, a transmission system and a brake system of a vehicle. The working principle of the wheel hub motor is a permanent magnet synchronous motor, and the wheel hub motor refer to motors which are arranged on vehicles and have different positions;

because in-wheel motor, the motor is arranged in wheel hub, in order to prevent that the motor from receiving the damage, can seal the wheel hub and handle, when carrying out wheel hub braking and the high-speed use of motor like this, the temperature can improve greatly in the wheel hub, does not effectively dispel the heat, can cause the damage to the motor in the wheel hub to influence in-wheel motor's use, for this reason, we provide a single bearing water-cooling wheel hub motor and be used for solving above-mentioned problem.

Disclosure of Invention

The invention aims to provide a single-bearing water-cooling hub motor to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a single bearing water-cooling in-wheel motor, includes the wheel hub frame, the top of wheel hub frame has the closing cap through bolt seal fixed mounting, be equipped with wheel hub electric machine part in the wheel hub frame, be equipped with actuating mechanism between the inboard bottom of wheel hub electric machine part and wheel hub frame, be equipped with water-cooling mechanism in the wheel hub electric machine part.

Preferably, the in-wheel motor spare includes the motor frame, there is the motor lid on the top of motor frame through bolt fixed mounting, motor frame, motor lid axis department are equipped with the dead axle, the equal fixing clip in middle part of motor frame, motor lid is equipped with first bearing, the outside middle part fixing clip of motor lid is equipped with first seal ring, the outside middle part fixing clip of motor frame is equipped with the second seal ring, the dead axle is fixed to be pegged graft at two first bearing middle parts, the dead axle activity runs through first seal ring, second seal ring, the outside middle part of dead axle is equipped with stator module, the inboard of motor frame is equipped with the rotor subassembly that uses with the stator module cooperation.

Preferably, the bottom fixed mounting of motor lid has sealed snap ring, the sealed annular that corresponds with sealed snap ring is seted up on the top of motor frame, sealed snap ring activity joint is in the sealed annular that corresponds, be equipped with the joint sealant ring between sealed snap ring, the sealed annular.

Preferably, the middle fixing clamp of the outer wheel hub frame is provided with a second bearing, and the middle fixing clamp of the sealing cover is provided with a third bearing.

Preferably, the dead axle is fixedly inserted in the middle of the second bearing and the third bearing.

Preferably, the middle part of the fixed shaft is provided with a wire inlet groove.

Preferably, actuating mechanism includes interior ring gear and decides the frame, interior ring gear fixed joint is in the inboard bottom of wheel hub frame, the installation poling has been seted up at the middle part of deciding the frame, the outside bottom integrated into one piece of dead axle has and the installation that the installation poling corresponds is protruding, decide the frame through installation poling demountable installation on the installation is protruding, decide on the frame the fixing clip be equipped with about the installation poling be the three fourth bearing that annular array distributes, the equal fixing clip in middle part of fourth bearing is equipped with the auxiliary shaft, the equal coaxial fixed mounting in top of auxiliary shaft has planetary gear, it is three planetary gear's the outside all is connected with the inboard meshing of interior ring gear, the fixed cover in bottom outside of second seal ring is equipped with the well gear that uses with planetary gear cooperation, well gear is located three planetary gear intermediate position, well gear and a plurality of planetary gear meshing are connected.

Preferably, the water-cooling mechanism includes the circulating pipe, the circulating pipe is equipped with a plurality of vertical distributions, and is a plurality of integrated into one piece has a plurality of communicating pipes between the circulating pipe, and is a plurality of the circulating pipe is with a plurality of communicating pipe fixed joint in stator module, the inboard integrated into one piece of circulating pipe has first perpendicular pipe and the perpendicular pipe of second, first perpendicular pipe and the perpendicular pipe of second distribute about the dead axle symmetry, the looks remote site of first perpendicular pipe and the perpendicular pipe of second all extends into the dead axle in, the looks remote site of first perpendicular pipe and the perpendicular pipe of second all is connected with first pipe and second pipe perpendicularly, the fixed joint of first pipe and second pipe is in the dead axle, the one end that first perpendicular pipe was kept away from to first pipe all extends the one end of dead axle, the one end fixed mounting that first perpendicular pipe was kept away from to first pipe has first connector, the one end fixed mounting that the perpendicular pipe of second was kept away from to the second pipe has the second connector.

Preferably, a cooling cavity is formed between the hub outer frame and the inner side of the sealing cover and between the motor outer frame and the outer side of the motor cover.

Preferably, the bottom end of the first tube is integrally formed with a third tube, the bottom end of the third tube is integrally formed with a third vertical tube, the third tube and the third vertical tube are fixedly clamped in the fixed shaft, two ends of the third vertical tube extend out of the outer side of the fixed shaft, two ends of the third vertical tube extend to the bottom of the cooling cavity, the middle of the second tube is integrally formed with a fourth vertical tube, the fourth vertical tube is fixedly clamped in the fixed shaft, one end of the fourth vertical tube, which is far away from the second tube, extends out of the fixed shaft, and one end of the fourth vertical tube, which is far away from the second tube, extends to the top of the cooling cavity.

Compared with the prior art, the invention has the beneficial effects that:

1. by arranging the hub motor part and the driving mechanism, the stator component is used to be matched with the rotor component, the outer frame of the driving motor and the motor cover stably rotate on the outer side of the fixed shaft to drive the second seal ring to synchronously and stably rotate, so that the middle gear is driven to stably rotate, and the three planetary gears are synchronously driven to stably rotate on the fixed frame, so that the inner gear ring is driven to synchronously and stably rotate, and the outer frame of the hub is driven to synchronously and stably rotate;

2. through setting up wheel hub electric machine spare and actuating mechanism, water cooling mechanism, the cooperation uses the wheel hub frame, the closing cap, form the cooling chamber between the wheel hub frame, the closing cap inboard and the motor frame, the motor cap outside, open coolant liquid circulation pump mechanism, realize a plurality of circulating pipes, the continuous circulation of coolant liquid in the communicating pipe, carry out heat conduction formula heat dissipation to stator module through the coolant liquid that lasts the circulation, thereby carry out water-cooled heat conduction heat dissipation to the inside of wheel hub electric machine spare, prevent that the inside overheat of wheel hub electric machine spare from causing stator module, the rotor subassembly damages, influence the normal use of wheel hub electric machine spare, carry out the continuous circulation of coolant liquid in the cooling chamber in step, carry out heat conduction formula heat dissipation to the wheel hub outer frame inside and wheel hub electric machine spare exterior space through the coolant liquid that lasts the circulation, thereby carry out water-cooled heat conduction heat dissipation to the wheel hub outer frame inside and wheel hub electric machine spare exterior space in step, further prevent that the wheel hub electric machine spare from overheating from causing stator module, the rotor subassembly damages, influence the normal use of wheel hub electric machine spare and whole wheel hub.

Drawings

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

FIG. 1 is a schematic view of the structure of the present invention.

FIG. 2 is a schematic view of the structure connection after the detachment of the present invention.

FIG. 3 is a schematic view of the structural connection between the hub motor and the driving mechanism of the present invention.

Fig. 4 is an enlarged view of the invention at a in fig. 3.

FIG. 5 is a schematic view of a part of the structural connection of the hub motor according to the present invention.

FIG. 6 is a schematic view of the structural connection between the hub motor and the water cooling mechanism according to the present invention.

Fig. 7 is an enlarged view of the invention at B in fig. 6.

Fig. 8 is an enlarged view of the invention at C in fig. 6.

Fig. 9 is a schematic plan view of the present invention.

In the figure: 1. a hub outer frame; 2. sealing the cover; 3. a hub motor member; 4. a drive mechanism; 5. a water cooling mechanism; 11. a second bearing; 21. a third bearing; 31. a motor outer frame; 32. a motor cover; 33. fixing a shaft; 331. a wire inlet groove; 34. a first bearing; 35. a first seal ring; 351. a second seal ring; 36. a stator assembly; 37. a rotor assembly; 321. sealing the snap ring; 322. sealing the ring groove; 323. sealing the rubber ring; 41. an inner gear ring; 42. fixing a frame; 421. installing a through groove; 422. mounting a boss; 43. a fourth bearing; 44. an auxiliary shaft; 45. a planetary gear; 46. a middle gear; 51. a circulation pipe; 52. a communicating pipe; 53. a first vertical tube; 54. a second vertical tube; 55. a first tube; 56. a second tube; 57. a third tube; 58. a third vertical pipe; 59. a fourth vertical tube; 510. a first connector; 511. a second connector; 101. and a cooling cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment is as follows: as shown in fig. 1 to 9, the invention provides a single-bearing water-cooling hub motor, which comprises a hub outer frame 1, wherein a sealing cover 2 is fixedly mounted at the top end of the hub outer frame 1 through bolts in a sealing manner, so that the hub outer frame 1 and the sealing cover 2 can be conveniently detached from each other, a hub electric part 3 is arranged in the hub outer frame 1, a driving mechanism 4 is arranged between the hub electric part 3 and the bottom of the inner side of the hub outer frame 1, and a water-cooling mechanism 5 is arranged in the hub electric part 3.

The hub motor part 3 comprises a motor outer frame 31, a motor cover 32 is fixedly mounted at the top end of the motor outer frame 31 through bolts, a sealing snap ring 321 is fixedly mounted at the bottom end of the motor cover 32, a sealing ring groove 322 corresponding to the sealing snap ring 321 is formed in the top end of the motor outer frame 31, the sealing snap ring 321 is movably clamped in the corresponding sealing ring groove 322, a sealing rubber ring 323 is arranged between the sealing snap ring 321 and the sealing ring groove 322, the sealing snap ring 321 is movably clamped in the corresponding sealing ring groove 322 through the arrangement of the sealing snap ring 321, the sealing ring groove 322 and the sealing rubber ring 323, the sealing mounting between the motor cover 32 and the motor outer frame 31 is carried out, and the disassembly between the motor cover 32 and the motor outer frame 31 is convenient;

the axial lines of the motor outer frame 31 and the motor cover 32 are provided with fixed shafts 33, the middle parts of the motor outer frame 31 and the motor cover 32 are fixedly clamped with first bearings 34, the middle part of the outer side of the motor cover 32 is fixedly clamped with first sealing rings 35, the middle part of the outer side of the motor outer frame 31 is fixedly clamped with second sealing rings 351, the fixed shafts 33 are fixedly inserted in the middle parts of the two first bearings 34, so that the motor outer frame 31 and the motor cover 32 can stably rotate on the outer side of the fixed shafts 33, the fixed shafts 33 movably penetrate through the first sealing rings 35 and the second sealing rings 351, the penetrating positions of the fixed shafts 33, the motor outer frame 31 and the motor cover 32 are sealed through the first sealing rings 35 and the second sealing rings 351, the middle parts of the outer sides of the fixed shafts 33 are provided with stator assemblies 36, the inner sides of the motor outer frame 31 are provided with rotor assemblies 37 matched with the stator assemblies 36, the middle parts of the fixed shafts 33 are provided with wire inlet slots 331, and the stator assemblies 37 are conveniently enter the motor outer frame 31 through the wire inlet slots 331, and are matched with the stator assemblies 37, and the stator assemblies 33, and the stator assemblies 32 to stably rotate.

The middle fixing clamp of the hub outer frame 1 is provided with a second bearing 11, and the middle fixing clamp of the seal cover 2 is provided with a third bearing 21; the fixed shaft 33 is fixedly inserted in the middle of the second bearing 11 and the third bearing 21, the fixed shaft 33 is fixedly inserted in the middle of the second bearing 11 and the third bearing 21 by arranging the second bearing 11 and the third bearing 21, and the hub outer frame 1 and the sealing cover 2 can stably rotate outside the fixed shaft 33.

The driving mechanism 4 includes an inner gear ring 41 and a fixed frame 42, the fixed joint of the inner gear ring 41 is at the inner bottom of the hub outer frame 1, an installation through groove 421 is provided at the middle part of the fixed frame 42, an installation convex 422 corresponding to the installation through groove 421 is formed at the outer bottom of the fixed shaft 33, the fixed frame 42 is detachably installed on the installation convex 422 through the installation through groove 421, the detachable fixed connection between the fixed frame 42 and the fixed shaft 33 is performed, the fixed joint on the fixed frame 42 is provided with three fourth bearings 43 distributed in an annular array manner with respect to the installation through groove 421, the middle parts of the fourth bearings 43 are respectively provided with an auxiliary shaft 44, the top ends of the auxiliary shafts 44 are respectively and coaxially and fixedly provided with a planetary gear 45, the planetary gear 45 can stably rotate on the fixed frame 42 by being provided with the fourth bearings 43, the outer sides of the planetary gear 45 are respectively engaged with the inner side of the inner gear ring 41, the outer side of the second sealed ring 351 is fixedly provided with a middle gear 46 used in cooperation with the planetary gear 45, the middle gear 46 is located at the middle position of the three planetary gear 45, the middle gear 46 is stably rotated on the fixed ring 351, the outer side of the fixed ring 351, and further, the synchronous rotating motor is stably driven by a motor, and the fixed ring 32, and the outer side of the fixed ring 32, thereby, and the outer frame is stably driven by the synchronous motor, and the synchronous motor is stably driven by the synchronous motor, and the fixed ring 32.

The water cooling mechanism 5 comprises a circulating pipe 51, a plurality of the circulating pipes 51 are vertically distributed, a plurality of communicating pipes 52 are integrally formed among the circulating pipes 51, the communicating pipes 52 communicate among the circulating pipes 51, the circulating pipes 51 and the communicating pipes 52 are fixedly clamped in the stator assembly 36, a first vertical pipe 53 and a second vertical pipe 54 are integrally formed inside the circulating pipe 51, the first vertical pipe 53 and the second vertical pipe 54 are symmetrically distributed about the fixed shaft 33, opposite ends of the first vertical pipe 53 and the second vertical pipe 54 extend into the fixed shaft 33, opposite ends of the first vertical pipe 53 and the second vertical pipe 54 are vertically connected with a first pipe 55 and a second pipe 56, the first pipe 55 and the second pipe 56 are fixedly clamped in the fixed shaft 33, and one ends of the first pipe 55 and the second pipe 56 far away from the first vertical pipe 53 extend out of one end of the fixed shaft 33, when the cooling liquid circulation pump mechanism is started, the cooling liquid is input into the first vertical pipe 53 through the output end, the first connector 510 and the first pipe 55, then enters the plurality of circulation pipes 51 and the communication pipe 52, then enters the second vertical pipe 54, and is input into the cooling liquid circulation pump mechanism through the second pipe 56 and the second connector 511, so that the continuous circulation of the cooling liquid in the plurality of circulation pipes 51 and the communication pipe 52 is realized, and the stator assembly 36 is subjected to heat conduction type heat dissipation through the continuously circulating cooling liquid, therefore, water-cooled heat conduction and heat dissipation are carried out inside the hub electric machine part 3, and the damage of the stator assembly 36 and the rotor assembly 37 caused by overheating inside the hub electric machine part 3 is prevented, so that the normal use of the hub electric machine part 3 is influenced.

A cooling cavity 101 is formed between the inner sides of the hub outer frame 1 and the sealing cover 2 and between the outer sides of the motor outer frame 31 and the motor cover 32, and due to the sealing between the hub outer frame 1 and the sealing cover 2 and the sealing between the motor outer frame 31 and the motor cover 32, the cooling cavity 101 is formed between the inner sides of the hub outer frame 1 and the sealing cover 2 and between the outer sides of the motor outer frame 31 and the motor cover 32; a third pipe 57 is integrally formed at the bottom end of the first pipe 55, a third vertical pipe 58 is integrally formed at the bottom end of the third pipe 57, the third pipe 57 and the third vertical pipe 58 are fixedly clamped in the fixed shaft 33, both ends of the third vertical pipe 58 extend out of the fixed shaft 33, both ends of the third vertical pipe 58 extend to the bottom of the cooling cavity 101, a fourth vertical pipe 59 is integrally formed at the middle of the second pipe 56, the fourth vertical pipe 59 is fixedly clamped in the fixed shaft 33, one end of the fourth vertical pipe 59 far away from the second pipe 56 extends out of the fixed shaft 33, one end of the fourth vertical pipe 59 far away from the second pipe 56 extends to the top of the cooling cavity 101, a part of the cooling liquid entering the second vertical pipe 54 is also discharged into both ends of the third pipe 57 and the third vertical pipe 58 into the bottom of the cooling cavity 101, then the whole cooling cavity 101 is filled with the cooling liquid, and enters the second vertical pipe 56 through the fourth vertical pipe 59 at the top of the cooling cavity 101 into the second vertical pipe 56, and then discharged into the bottom of the cooling cavity 101 into the cooling cavity 56, so as to prevent the electric cooling liquid circulation of the cooling liquid and the hub cooling liquid 3, and the hub external heat dissipation mechanism 3, thereby preventing the hub from being damaged by the hub external heat dissipation mechanism 1 and the hub.

The working principle is as follows: when the wheel hub motor part is used, the wheel hub outer frame 1, the wheel hub motor part 3, the driving mechanism 4 and the sealing cover 2 are assembled, because the wheel hub outer frame 1 and the sealing cover 2 are sealed, and the motor outer frame 31 and the motor cover 32 are sealed, a cooling cavity 101 is formed between the inner sides of the wheel hub outer frame 1 and the sealing cover 2 and between the outer sides of the motor outer frame 31 and the motor cover 32, two end parts of a fixed shaft 33 in the wheel hub motor part 3 are fixed, and the first connector 510 and the second connector 511 are respectively connected with the output end and the input end of a cooling liquid circulating pump mechanism;

then, the whole water-cooled hub motor is used, the stator assembly 36 is used, the rotor assembly 37 is matched, the motor outer frame 31 and the motor cover 32 are driven to stably rotate on the outer side of the fixed shaft 33, the second sealing ring 351 is driven to synchronously and stably rotate, the middle gear 46 is driven to stably rotate, the three planet gears 45 are further synchronously driven to stably rotate on the fixed frame 42, the inner gear ring 41 is driven to synchronously and stably rotate, the hub outer frame 1 on the outer side is further driven to synchronously and stably rotate, after the water-cooled hub motor is used for a long time, the temperature of the hub motor part 3 is increased due to the sealing between the hub outer frame 1 and the sealing cover 2, and the temperature of the inner space of the hub outer frame 1 is increased;

at this time, a cooling liquid circulating pump mechanism is started, cooling liquid is input into the first vertical pipe 53 through the output end, the first connecting joint 510 and the first pipe 55, then enters the plurality of circulating pipes 51 and the communicating pipe 52, then enters the second vertical pipe 54, and is input into the cooling liquid circulating pump mechanism through the second pipe 56 and the second connecting joint 511, so that continuous circulation of the cooling liquid in the plurality of circulating pipes 51 and the communicating pipe 52 is realized, heat conduction type heat dissipation is performed on the stator assembly 36 through the continuously circulating cooling liquid, water-cooled heat conduction heat dissipation is performed on the interior of the hub electric machine part 3, and the damage of the stator assembly 36 and the rotor assembly 37 caused by overheating of the interior of the hub electric machine part 3 is prevented, and the normal use of the hub electric machine part 3 is influenced;

meanwhile, a part of the cooling liquid entering the second vertical pipe 54 is discharged into the bottom of the cooling cavity 101 through the third pipe 57 and the two end parts of the third vertical pipe 58, and then, the cooling liquid is filled in the whole cooling cavity 101 and enters the second pipe 56 through the fourth vertical pipe 59 on the top of the cooling cavity 101, so that the continuous circulation of the cooling liquid in the cooling cavity 101 is synchronously performed, and the heat conduction type heat dissipation is performed on the inner space of the hub outer frame 1 and the outer space of the hub electric parts 3 through the continuously circulated cooling liquid, so that the water-cooled heat conduction heat dissipation is synchronously performed on the inner space of the hub outer frame 1 and the outer space of the hub electric parts 3, and further, the damage of the stator assembly 36 and the rotor assembly 37 caused by the overheating of the hub electric parts 3 is prevented, and the normal use of the hub electric parts 3 and the whole hub is influenced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a single bearing water-cooling in-wheel motor, includes wheel hub frame (1), its characterized in that: the top of wheel hub frame (1) has closing cap (2) through bolt seal fixed mounting, be equipped with wheel hub electric machine part (3) in the wheel hub frame (1), be equipped with actuating mechanism (4) between the inboard bottom of wheel hub electric machine part (3) and wheel hub frame (1), be equipped with water cooling mechanism (5) in the wheel hub electric machine part (3).

2. The single-bearing water-cooled hub motor according to claim 1, characterized in that: the wheel hub electric machine part (3) comprises a motor outer frame (31), a motor cover (32) is installed on the top end of the motor outer frame (31) through bolt fixing, a fixed shaft (33) is arranged at the axis of the motor outer frame (31) and the motor cover (32), first bearings (34) are arranged on the middle fixing clamps of the motor outer frame (31) and the motor cover (32), a first seal ring (35) is arranged on the outer middle fixing clamp of the motor cover (32), a second seal ring (351) is arranged on the outer middle fixing clamp of the motor outer frame (31), the fixed shaft (33) is fixedly inserted in the middle of the two first bearings (34), the fixed shaft (33) movably penetrates through the first seal ring (35) and the second seal ring (351), a stator assembly (36) is arranged in the middle of the outer side of the fixed shaft (33), and a rotor assembly (37) matched with the stator assembly (36) for use is arranged on the inner side of the motor outer frame (31).

3. The single-bearing water-cooled hub motor as claimed in claim 2, wherein: the bottom fixed mounting of motor lid (32) has sealed snap ring (321), sealed annular (322) that correspond with sealed snap ring (321) have been seted up on the top of motor frame (31), sealed snap ring (321) activity joint is in sealed annular (322) that correspond, be equipped with between sealed snap ring (321), sealed annular (322) and seal gluey ring (323).

4. The single-bearing water-cooled hub motor as claimed in claim 2, wherein: the middle fixing clamp of the hub outer frame (1) is provided with a second bearing (11), and the middle fixing clamp of the sealing cover (2) is provided with a third bearing (21).

5. The single-bearing water-cooled hub motor as claimed in claim 4, wherein: the fixed shaft (33) is fixedly inserted in the middle of the second bearing (11) and the third bearing (21).

6. The single-bearing water-cooled hub motor as claimed in claim 2, wherein: the middle part of the fixed shaft (33) is provided with a wire inlet groove (331).

7. The single-bearing water-cooled hub motor as claimed in claim 2, wherein: actuating mechanism (4) are including interior ring gear (41) and decide frame (42), the inboard bottom of interior ring gear (41) fixed joint at wheel hub frame (1), the middle part of deciding frame (42) has been seted up installation poling groove (421), the outside bottom integrated into one piece of dead axle (33) has the installation protruding (422) that corresponds with installation poling groove (421), decide frame (42) through installation poling groove (421) demountable installation on installation protruding (422), it is equipped with about installation poling groove (421) three fourth bearing (43) that are the annular array and distribute to decide frame (42) on the fixed joint, the equal fixing clip in middle part of fourth bearing (43) is equipped with auxiliary shaft (44), the equal coaxial fixed mounting in top of auxiliary shaft (44) has planetary gear (45), three the outside of planetary gear (45) all is connected with the inboard meshing of interior ring gear (41), the fixed cover in the bottom outside of second seal ring (351) is equipped with planetary gear (45) cooperation use well gear (46), planetary gear (46) are located three well gear (46) and many planetary gear (46) meshing.

8. The single-bearing water-cooled hub motor as claimed in claim 2, wherein: the water cooling mechanism (5) comprises a plurality of circulating pipes (51), the circulating pipes (51) are vertically distributed, a plurality of communicating pipes (52) are integrally formed among the circulating pipes (51), the plurality of circulating pipes (51) and the plurality of communicating pipes (52) are fixedly clamped in the stator assembly (36), a first vertical pipe (53) and a second vertical pipe (54) are integrally formed inside the circulation pipe (51), the first vertical pipe (53) and the second vertical pipe (54) are symmetrically distributed around the fixed shaft (33), the opposite ends of the first vertical pipe (53) and the second vertical pipe (54) each extend into the fixed shaft (33), opposite ends of the first vertical pipe (53) and the second vertical pipe (54) are vertically connected with a first pipe (55) and a second pipe (56), the first pipe (55) and the second pipe (56) are fixedly clamped in the fixed shaft (33), one end of the first pipe (55) and one end of the second pipe (56) far away from the first vertical pipe (53) extend out of one end of the fixed shaft (33), one end part of the first pipe (55) far away from the first vertical pipe (53) is fixedly provided with a first connecting head (510), and a second connector (511) is fixedly arranged at one end part of the second pipe (56) far away from the second vertical pipe (54).

9. The single-bearing water-cooled hub motor of claim 8, wherein: and a cooling cavity (101) is formed between the inner sides of the hub outer frame (1) and the sealing cover (2) and the outer sides of the motor outer frame (31) and the motor cover (32).

10. The single-bearing water-cooled hub motor of claim 9, wherein: the bottom end of the first pipe (55) is integrally formed with a third pipe (57), the bottom end of the third pipe (57) is integrally formed with a third vertical pipe (58), the third pipe (57) and the third vertical pipe (58) are fixedly clamped in the fixed shaft (33), two ends of the third vertical pipe (58) extend out of the fixed shaft (33), two ends of the third vertical pipe (58) extend to the bottom of the cooling cavity (101), the middle of the second pipe (56) is integrally formed with a fourth vertical pipe (59), the fourth vertical pipe (59) is fixedly clamped in the fixed shaft (33), one end, far away from the second pipe (56), of the fourth vertical pipe (59) extends out of the fixed shaft (33), and one end, far away from the second pipe (56), of the fourth vertical pipe (59) extends to the top of the cooling cavity (101).