CN219697434U

CN219697434U - In-wheel motor with internal speed change mechanism

Info

Publication number: CN219697434U
Application number: CN202320541620.0U
Authority: CN
Inventors: 温群峰
Original assignee: Suzhou Shengyi Motor Co ltd
Current assignee: Suzhou Shengyi Motor Co ltd
Priority date: 2023-03-20
Filing date: 2023-03-20
Publication date: 2023-09-15
Anticipated expiration: 2033-03-20

Abstract

The utility model discloses a hub motor with an internal speed change mechanism, which comprises a through shaft, a hub arranged on the through shaft, a movement positioned in the hub, a planetary reduction mechanism and an internal speed change mechanism, wherein the hub comprises a hub shell and a hub end cover fixed with the hub shell; the method is characterized in that: the hub is internally provided with an internal speed change mechanism, a planetary reduction mechanism and a core sequentially along the axial direction of a through shaft from a hub end cover, the through shaft is provided with a wiring duct which penetrates through a shell shaft hole and is communicated to the outside of the hub shell, and an outgoing cable of the core is led out to the outside of the hub shell through the wiring duct. Compared with the prior art, the utility model can improve the strength of the through shaft, reduce the processing difficulty of the axial duct, and is easier to produce and assemble, thereby ensuring the working reliability of the hub motor, saving the production cost and improving the production efficiency.

Description

In-wheel motor with internal speed change mechanism

Technical Field

The utility model relates to a hub motor with an internal speed change mechanism.

Background

Currently, there are hub motors on the market that integrate an internal gear (internal gear hub), and the axial configuration structure inside the hub is usually an internal gear, a movement and a planetary reduction mechanism that are sequentially arranged along a through shaft. The inner shift mechanism is typically disposed on one side of the hub end cover to facilitate connection and assembly thereof with the hub end cover, which is secured to the hub shell to form a hub. The hub end cover is provided with an end cover shaft hole, and the hub shell is provided with a shell shaft hole, so that two ends of the through shaft extend out respectively. The front part of the inner speed changing mechanism extends out of the axle hole of the end cover to fix the flywheel. The output end of the movement is a shaft sleeve connected with the rotor, a sun gear in the planetary reduction mechanism is fixed on the shaft sleeve, and the sun gear is meshed with an inner gear ring on the inner periphery of the hub shell through a plurality of planetary gears in the planetary reduction mechanism. The planetary reduction mechanism takes a clutch as a planetary carrier, a planetary shaft of each planetary gear is fixed on an outer ring of the clutch, and an inner ring of the clutch is fixed on a through shaft.

In order to avoid reducing the structural strength of the through shaft section supporting the internal speed change mechanism, the prior hub motor structure integrating the internal speed change mechanism generally does not have a wiring duct for leading out a core lead-out cable in the section. Moreover, in the industry standard for electric bicycle production, the through-shaft section for carrying the internal gear shifting mechanism is not allowed to be thickened, so that the strength cannot be improved by increasing the outer diameter of the through-shaft section. Therefore, the current practice is only to provide a wiring duct penetrating through the shaft hole of the housing on the through shaft section for supporting the planetary reduction mechanism so as to lead out the outgoing cable of the movement to the outside of the hub housing, however, the following problems exist in the structure:

because the routing duct needs to extend to the outside through the through shaft section where the planetary reduction mechanism is located, the travel is long, and for the routing duct with long travel, in order to reduce the processing difficulty of the routing duct with long travel on the through shaft, the operation efficiency is improved, the operation cost is reduced, and the axial duct processing mode of shaft end outgoing line is often adopted for processing, but not the oblique duct processing mode of shaft side outgoing line. However, there is a problem in that the axial duct further reduces the strength of the through shaft than the diagonal duct.

As the power of the hub motor is larger, the coils of the corresponding core stator part and the outgoing cables thereof also need to be thickened, and the aperture of the through shaft routing pore canal needs to be enlarged by thickening the outgoing cables, but the increase of the internal aperture obviously further leads to the reduction of the through shaft strength.

The known punching section is a through shaft section mainly used for supporting the planetary reduction mechanism, has high requirements on strength, and has high relevance on the supporting stability of the mechanism. Once the strength is reduced due to the enlarged internal aperture, the supporting stability of the through shaft to the planetary reduction mechanism, and even the whole hub and the internal mechanism thereof, is necessarily affected, and the working reliability and the service life of the hub motor are greatly reduced as soon as the service time is long.

In addition, the existing hub motor integrating the internal speed change mechanism has the planetary reduction mechanism positioned at the innermost side of the hub shell, so that the assembly is inconvenient, and particularly, after the inner speed change mechanism on the inner side of the core and the hub end cover is assembled, the adjustment of the planetary reduction mechanism is very difficult.

It is well known that in the design and manufacture of hub motors, lubricating grease is required for the planetary reduction mechanism and the internal gear transmission of the internal speed change mechanism, and the internal magnetic steel of the rotor and the stator coil of the movement often need to be isolated from the lubricating grease. However, at present, the hub motor integrated with the internal speed change mechanism is affected by lubricating grease at two sides because the movement is clamped between the planetary speed reduction mechanism and the internal speed change mechanism, and the lubricating grease is difficult to effectively isolate.

Disclosure of Invention

The utility model aims at: the hub motor with the internal speed change mechanism has the advantages that compared with the prior art, the hub motor with the internal speed change mechanism can improve the strength of a through shaft, simultaneously reduces the processing difficulty of an axial duct, and is easier to produce and assemble, so that the working reliability of the hub motor is ensured, and meanwhile, the production cost is saved and the production efficiency is improved.

The technical scheme of the utility model is as follows: the hub comprises a hub shell and a hub end cover fixed with the hub shell, the inner speed changing mechanism is connected with the hub end cover, and an end cover shaft hole and a shell shaft hole for extending out of two ends of the through shaft are respectively arranged on the hub end cover and the hub shell; the method is characterized in that: the hub is internally provided with an internal speed change mechanism, a planetary reduction mechanism and a core sequentially along the axial direction of a through shaft from a hub end cover, the through shaft is provided with a wiring duct which penetrates through a shell shaft hole and is communicated to the outside of the hub shell, and an outgoing cable of the core is led out to the outside of the hub shell through the wiring duct.

Furthermore, in the utility model, a shell end bearing for supporting the through shaft is arranged in the shell shaft hole, the hub end cover is sleeved on the inner speed change mechanism, the front part of the inner speed change mechanism extends out of the end cover shaft hole to fix the flywheel, the end cover end bearing for supporting the inner speed change mechanism is arranged in the end cover shaft hole, and the inner speed change mechanism is assembled on the through shaft through a plurality of inner speed change mechanism bearings.

Further, in the utility model, the routing duct is an inclined duct intersecting with the axis of the through shaft, and the outlet of the inclined duct is positioned on the side of the through shaft.

The movement in the utility model can be an outer rotor structure of the inner stator, and can be an inner stator structure of the outer rotor.

Furthermore, in the utility model, the movement is an outer rotor inner stator structure, the stator is fixed on an annular stator bracket, the coil on the stator is connected with the lead-out wire cable, the annular stator bracket is fixed on the through shaft, the annular stator bracket is radially provided with a threading hole connected with the wiring duct along the movement, and the lead-out wire cable passes through the threading hole and then enters the wiring duct.

Further, the planetary reduction mechanism comprises a sun gear, a plurality of planetary gears, an inner gear ring and a clutch, wherein a shaft sleeve sleeved on the periphery of a through shaft is fixed on a rotor, the sun gear is fixed on the shaft sleeve, the planetary gears are distributed in a central symmetry mode relative to the sun gear, and the planetary gears are meshed with the sun gear and the inner gear ring at the same time; the rotor is mounted on the through shaft by means of a number of rotor bearings and the planetary gears are mounted on the respective planetary shafts by means of a number of planetary gear bearings, which planetary shafts are each fixed to the outer ring of the clutch, while the inner ring of the clutch is fixed to said through shaft.

More preferably, the planetary gear is a plastic gear, and the sun gear is a metal gear, so as to ensure that transmission friction noise between gears is reduced. The plastic for the actual production of the planetary gear can be any existing common material in the industry, such as POM (polyoxymethylene) plastic, PEEK (polyether ether ketone) plastic, nylon plastic such as PA66, PA46 and the like. The metal material of the sun gear is also any existing common material in the industry, such as alloy steel of 40Cr, 45 Cr, 20CrMnTi and the like, conventional copper alloy (such as brass) and aluminum alloy and the like, and the forming mode can be milling, forging, cold extrusion, profile drawing, powder metallurgy and the like.

More preferably, the number of the planetary gears is 3 or more.

It should be noted that the internal gear shifting mechanism (i.e., the internal shift drum) according to the present utility model is of prior art, and its internal structure or constitution is not modified by the present utility model with reference to the known structure or the disclosed solution in the present industry.

The utility model has the advantages that:

1. the travel channel in the through shaft is directly led out of the hub shell from the core end through the shell shaft hole, and compared with the prior art, the travel of the travel channel is shorter, and the processing mode of the inclined channel is facilitated, so that the strength of the through shaft in which the travel channel is positioned can be improved, the processing difficulty of the travel channel on the through shaft can be greatly reduced, the working reliability of the hub motor is ensured, the production cost of the hub motor is saved, and the production efficiency of the hub motor is improved.

2. The utility model adjusts and optimizes the positions of the movement, the planetary reduction mechanism and the internal speed change mechanism in the axial direction in the hub, so that the through shaft section where the wiring duct is positioned does not need to support any internal mechanism of the hub, compared with the prior art, the strength requirement of the original through shaft section is greatly reduced, the association of the strength requirement and the supporting stability of the internal mechanism of the hub is eliminated, and the processing of the wiring duct in the through shaft section is conveniently implemented without excessively considering the strength problem. On the other hand, the punching requirement in the through shaft section of the planetary reduction mechanism is eliminated, so that the problem of strength reduction of the through shaft section is avoided, the integral strength of the through shaft is improved, and the integral working reliability and the service life of the hub motor are further ensured.

3. The outlet of the wiring duct is positioned on the side of the through shaft, so that the situation that the end part of the through shaft of the hub motor damages the outgoing cable in a grounding manner when the electric bicycle is toppled over can be avoided, and the outgoing cable is better protected.

4. Compared with the prior art, the structure design of the utility model has the advantages that the position of the planetary reduction mechanism in the hub shell is moved to the outer side of the movement, so that the assembly of the planetary reduction mechanism is facilitated, and the planetary reduction mechanism can be adjusted by only removing the hub end cover even if the movement is assembled, and the operation is more simple and convenient than the original operation.

5. Compared with the prior art, the structure design of the utility model has the advantages that the planetary reduction mechanism and the inner speed change mechanism are arranged on the outer side of the rotor of the movement, and gear lubricating grease in the planetary reduction mechanism and the inner speed change mechanism can be isolated through the rotor, so that the interior of the movement is more effectively protected from being polluted by the lubricating grease.

Drawings

The utility model is further described below with reference to the accompanying drawings and examples:

fig. 1 is a cross-sectional view of the structure of the present utility model.

Wherein: 1. a through shaft; 2. a movement; 201. a rotor; 202. a stator; 202a, a coil; 203. a rotor bearing; 3. a planetary reduction mechanism; 301. a sun gear; 302. a planetary gear; 303. an inner gear ring; 304. a clutch; 305. a planetary gear bearing; 306. a planetary shaft; 4. an internal gear shifting mechanism; 5. a hub shell; 501. a housing shaft hole; 6. a hub end cap; 601. an end cover shaft hole; 7. a wiring duct; 8. leading out the cable; 9. a housing end bearing; 10. a flywheel; 11. an end cap end bearing; 12. an inner variator bearing; 13. an annular stator support; 13a, threading holes; 14. a shaft sleeve.

Detailed Description

Examples: the following describes a specific embodiment of the in-wheel motor with an internal gear shift mechanism according to the present utility model with reference to fig. 1, as follows:

the hub motor with the internal speed change mechanism comprises a through shaft 1, a hub arranged on the through shaft 1, a movement 2 positioned in the hub, a planetary reduction mechanism 3 and an internal speed change mechanism 4, wherein the hub consists of a hub shell 5 and a hub end cover 6 fixed with the hub shell 5, the internal speed change mechanism 4 is connected with the hub end cover 6, and the hub end cover 6 and the hub shell 5 are respectively provided with an end cover shaft hole 601 and a shell shaft hole 501 for extending out of two ends of the through shaft 1. The utility model has the core improvement that: the inner speed change mechanism 4, the planetary reduction mechanism 3 and the movement 2 are assembled in sequence along the axial direction of the through shaft 1 from the hub end cover 6 in the hub, a wiring duct 7 which penetrates through the shell shaft hole 501 and is communicated to the outside of the hub shell 5 is arranged at the position of the through shaft 1 from the movement 2, and an outgoing cable 8 of the movement 2 is led out to the outside of the hub shell 5 through the wiring duct 7.

As shown in fig. 1, the routing duct 7 in this embodiment is an oblique duct intersecting with the axis of the through shaft 1, and its outlet is located on the side of the through shaft 1.

Still as shown in fig. 1, in this embodiment, the housing shaft hole 501 is internally provided with a housing end bearing 9 for supporting the through shaft 1, the hub end cover 6 is sleeved on the inner speed changing mechanism 4, the front part of the inner speed changing mechanism 4 extends out of the end cover shaft hole 601 to fix the flywheel 10, the end cover shaft hole 601 is internally provided with an end cover end bearing 11 for supporting the inner speed changing mechanism 4, and the inner speed changing mechanism 4 is internally assembled on the through shaft 1 through two inner speed changing mechanism bearings 12.

In this embodiment, the movement 2 is an outer rotor inner stator structure, the stator 202 is fixed on the annular stator support 13, the coil 202a on the stator 202 is connected with the outgoing cable 8, the annular stator support 13 is fixed on the through shaft 1, the annular stator support 13 is radially provided with a threading hole 13a connected with the routing duct 7 along the movement 2, and the outgoing cable 8 passes through the threading hole 13a and then enters the routing duct 7.

The planetary reduction mechanism 3 in this embodiment is configured as follows: sun gear 301, three planetary gears 302, inner gear ring 303, clutch 304, planetary gear bearing 305 and planetary shaft 306, the rotor 201 is fixed with shaft sleeve 14 which is sleeved on the periphery of through shaft 1, sun gear 301 is fixed on this shaft sleeve 14, three planetary gears 302 are distributed in central symmetry about sun gear 301, and planetary gears 302 are meshed with sun gear 301 and inner gear ring 303 at the same time; the rotor 201 is mounted on the through shaft 1 by means of two rotor bearings 203, while the planetary gears 302 are mounted on the respective planetary shafts 306 by means of a planetary gear bearing 305, these planetary shafts 306 being each fixed to the outer ring of the clutch 304, while the inner ring of the clutch 304 is fixed to said through shaft 1.

The planetary gear 302 is a plastic gear, the plastic for actual production is nylon plastic PA66 commonly used at present, the sun gear 301 is a metal gear, the planetary gear is manufactured by adopting 40Cr alloy steel commonly used in industry through a powder metallurgy process, and the plastic gear is meshed with the metal gear, so that noise can be reduced.

The wiring duct 7 in the through shaft 1 in the above embodiment is led out from the end of the movement 2 to the outside of the hub shell 5 through the shell shaft hole 501, which is shorter in travel compared with the prior art, and is beneficial to adopting the processing mode of the oblique duct, so that the strength of the through shaft 1 where the through shaft is located can be improved, and the processing difficulty of the through shaft 1 can be greatly reduced, thereby ensuring the working reliability of the hub motor, saving the production cost and improving the production efficiency of the hub motor.

In addition, the positions of the movement 2, the planetary reduction mechanism 3 and the internal speed change mechanism 4 in the hub in the axial direction are adjusted and optimized, so that the section of the through shaft 1 where the wiring duct 7 is positioned does not need to support any hub internal mechanism, compared with the prior art, the strength requirement of the section of the through shaft 1 is greatly reduced, the association of the section of the through shaft 1 with the support stability of the hub internal mechanism is eliminated, and the processing of the wiring duct 7 in the section of the through shaft 1 is conveniently implemented without excessively considering the strength problem. On the other hand, the punching requirement in the section of the through shaft 1, which is originally required to be assembled with the planetary reduction mechanism 3, is removed, so that the problem of strength reduction of the section of the through shaft 1 is avoided, the integral strength of the through shaft 1 is improved, and the integral working reliability and the service life of the hub motor are further ensured.

In addition, because the outlet of the wiring duct 7 is located on the side of the through shaft 1 in the above embodiment, when the electric bicycle is toppled over, the end part of the through shaft 1 of the hub motor is prevented from damaging the outgoing cable 8 by the ground pressure, and the outgoing cable 8 is better protected.

And the structural design of this embodiment compares prior art, and it moves the position of planetary reduction gears 3 in hub shell 5 to the outside of core 2, and is more favorable to its assembly like this, even though core 2 has assembled, also only need pull down hub end cover 6 and just can adjust planetary reduction gears 3, and the operation is more simple and convenient than original.

And the structural design of this embodiment is compared with the prior art, and it is arranged the planetary reduction mechanism 3 and the internal gear shifting mechanism 4 outside the rotor 201 of the movement 2, can keep apart the gear lubricating grease in the planetary reduction mechanism 3 and the internal gear shifting mechanism 4 through the rotor 201, thereby more effectively protecting the inside of the movement 2 from the pollution of lubricating grease.

The above embodiments are merely for illustrating the technical concept and features of the present utility model, and are not intended to limit the scope of the present utility model to those skilled in the art to understand the present utility model and implement the same. All modifications made according to the spirit of the main technical proposal of the utility model should be covered in the protection scope of the utility model.

Claims

1. The hub comprises a through shaft (1), a hub arranged on the through shaft (1), a movement (2) positioned in the hub, a planetary reduction mechanism (3) and an inner speed change mechanism (4), wherein the hub comprises a hub shell (5) and a hub end cover (6) fixed with the hub shell (5), the inner speed change mechanism (4) is connected with the hub end cover (6), and the hub end cover (6) and the hub shell (5) are respectively provided with an end cover shaft hole (601) and a shell shaft hole (501) which are used for extending out of two ends of the through shaft (1); the method is characterized in that: the hub is internally provided with an inner speed change mechanism (4), a planetary reduction mechanism (3) and a movement (2) along the axial direction of a through shaft (1) from a hub end cover (6) in sequence, the through shaft (1) is provided with a wiring duct (7) which penetrates through a shell shaft hole (501) and is communicated to the outside of a hub shell (5) from the position of the movement (2), and an outgoing cable (8) of the movement (2) is led out to the outside of the hub shell (5) through the wiring duct (7).

2. The hub motor with the internal gear shifting mechanism according to claim 1, characterized in that a shell end bearing (9) for supporting the through shaft (1) is installed in the shell shaft hole (501), the hub end cover (6) is sleeved on the internal gear shifting mechanism (4), the front part of the internal gear shifting mechanism (4) extends out of the end cover shaft hole (601) to fix the flywheel (10), an end cover end bearing (11) for supporting the internal gear shifting mechanism (4) is installed in the end cover shaft hole (601), and the inside of the internal gear shifting mechanism (4) is assembled on the through shaft (1) through a plurality of internal gear shifting mechanism bearings (12).

3. The hub motor with an internal speed change mechanism according to claim 1, wherein the wiring duct (7) is an inclined duct intersecting with the axis of the through shaft (1), and the outlet thereof is located on the side of the through shaft (1).

4. The hub motor with the internal speed change mechanism according to claim 1, wherein the movement (2) is an external rotor internal stator structure, the stator (202) is fixed on the annular stator support (13), the coil (202 a) on the stator (202) is connected with the outgoing cable (8), the annular stator support (13) is fixed on the through shaft (1), the threading hole (13 a) connected with the routing channel (7) is radially arranged on the annular stator support (13) along the movement (2), and the outgoing cable (8) passes through the threading hole (13 a) and then enters the routing channel (7).

5. The hub motor with an internal gear change mechanism according to claim 4, wherein the planetary reduction mechanism (3) comprises a sun gear (301), a plurality of planetary gears (302), an inner gear ring (303) and a clutch (304), a shaft sleeve (14) sleeved on the periphery of the through shaft (1) is fixed on the rotor (201), the sun gear (301) is fixed on the shaft sleeve (14), the planetary gears (302) are distributed in a central symmetry manner with respect to the sun gear (301), and the planetary gears (302) are meshed with the sun gear (301) and the inner gear ring (303) at the same time; the rotor (201) is mounted on the through shaft (1) by means of a number of rotor bearings (203), and the planetary gears (302) are mounted on the respective planetary shafts (306) by means of a number of planetary gear bearings (305), which planetary shafts (306) are each fixed to the outer ring of the clutch (304), while the inner ring of the clutch (304) is fixed to said through shaft (1).

6. The in-wheel motor with an internal gear change mechanism according to claim 5, characterized in that the planetary gear (302) is a plastic gear and the sun gear (301) is a metal gear.

7. The in-wheel motor with an internal gear change mechanism according to claim 5, characterized in that the number of the planetary gears (302) is 3 or more.