CN114408083A - High-stability middle-placed motor adopting planetary reduction mechanism - Google Patents
High-stability middle-placed motor adopting planetary reduction mechanism Download PDFInfo
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- CN114408083A CN114408083A CN202210172435.9A CN202210172435A CN114408083A CN 114408083 A CN114408083 A CN 114408083A CN 202210172435 A CN202210172435 A CN 202210172435A CN 114408083 A CN114408083 A CN 114408083A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
- B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
- B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
- B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Mechanical Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention discloses a high-stability middle-mounted motor adopting a planetary reduction mechanism, which comprises a shell, a machine core, the planetary reduction mechanism and a chain wheel positioning sleeve, wherein the lower part of the shell penetrates through a middle shaft; the core shaft of the machine core is connected with a planetary reduction mechanism, the front end of a planet carrier of the planetary reduction mechanism is fixedly or integrally provided with a planetary output wheel, a pinion is coaxially arranged on the planetary output wheel, and the pinion is meshed with a gearwheel on a chain wheel positioning sleeve through a one-way clutch; the chain wheel positioning sleeve is sleeved on the middle shaft, and the front part of the chain wheel positioning sleeve extends out of the shell to fix the chain wheel; the sun gear is arranged on the cantilever shaft and meshed with a plurality of planet gears arranged in the planet carrier; the planet output wheel is provided with a central shaft which is coaxial with the core shaft, and the central shaft is assembled in the shell by an output wheel bearing. The invention has better operation stability, lower noise, higher working reliability and easy assembly.
Description
Technical Field
The invention relates to a high-stability middle-mounted motor adopting a planetary reduction mechanism.
Background
The existing electric bicycle usually adopts a middle-mounted motor as a power core component, a core shaft of a core mechanism consisting of a stator and a rotor transmits power to a middle shaft and a chain wheel fixed on the middle shaft through a speed reducing mechanism, and then the chain wheel drives a driving wheel of the electric bicycle to rotate and advance. And because the output power of the motor is controlled by identifying the pedaling force of the person when the electric bicycle is ridden, a torque sensing mechanism for detecting the pedaling force is also arranged in the middle-arranged motor, so that the running state of the bicycle is accurately controlled by matching with a controller.
At present, the requirements of the industry on the centrally-mounted motor not only have the characteristics of compact structure, small volume, high control precision and large output torque, but also put higher requirements on the running stability and the working reliability of an internal mechanism, particularly a speed reducing mechanism, and the assembly convenience of each mechanism part.
In the existing middle-placed motor in the market, a planetary speed reducing mechanism is adopted in the speed reducing mechanism in order to enhance the supporting stability of the speed reducing mechanism and the stress balance in the gear transmission process. In the structure of the middle motor, a core shaft of a machine core is directly connected with a planetary speed reducing mechanism and drives a planetary carrier to rotate, a planetary output wheel is fixed at the front end of the planetary carrier, a transmission gear is arranged on the planetary output wheel and is meshed with an output gear on a middle shaft, the output gear is arranged on the middle shaft through a one-way clutch, and a torque sensing mechanism is arranged on the middle shaft. For example, an intelligent centrally-mounted motor disclosed in CN112078715A is the above structure.
It should be said that although the existing centrally-mounted motor with the above structure is compact, the planetary reduction mechanism thereof also solves the problems of the single-stage gear reduction mechanism to a certain extent, but still has the following defects:
1) the core shaft of the machine core is designed to be through with a long shaft, the main body part of the planetary gear of the planetary reduction mechanism is arranged on the shaft through a bearing support frame, and the planetary output wheel is also arranged on the shaft through the bearing support frame, so that the load on the shaft is large.
In particular, the planetary output wheel needs to be provided with a gear to be meshed with the output gear on the middle shaft to transmit torque, so that the shaft section where the planetary output wheel is located is also subjected to gear transmission torque besides the weight of the planetary output wheel, and the load pressure is larger. As is well known, the movement is limited by the size of the rotor due to its own structure, and the spindle is mostly a thin shaft, so that it is practically difficult to bear the above-mentioned load in long-term use. The long operating time of the motor, the support intensity of its core axle will decline, and produce the deformation easily, lead to the degree of cooperation between the mechanism to reduce, can't further steady operation, the noise increase, operational reliability greatly reduced. When the motor is serious, the mandrel can be broken, and the middle motor is scrapped.
) Because the mandrel adopts a long shaft design, the mandrel is matched with the planetary speed reducing mechanism and is also connected and matched with the planetary output wheel and the motor shell, special design and processing are needed, the existing modularized core cannot be used, and the mandrel of the existing modularized core cannot be directly matched with the planetary output wheel and the motor shell, so that the overall production and assembly process of the middle motor is complicated, the efficiency is greatly reduced, and the cost is increased.
In addition, put the motor in at present often need through at epaxial shaping shaft shoulder of axis to the axial positioning of axis, again with shell inner bearing and the mutual contact cooperation of deformation axle sleeve among the moment sensing mechanism realize, the structure is complicated, assembles loaded down with trivial details, needs urgently to improve.
Disclosure of Invention
The invention aims to: the utility model provides an adopt planetary reduction mechanism's put motor in high stability, its operating stability is better, and the noise is littleer, and operational reliability is higher to easily assemble, assembly efficiency is high.
The technical scheme of the invention is as follows: a high-stability mid-motor adopting a planetary reduction mechanism comprises a shell with a middle shaft penetrating through the lower part, and a machine core, the planetary reduction mechanism and a chain wheel positioning sleeve which are arranged in the shell; the core shaft of the machine core is connected with a planetary reduction mechanism, a planetary output wheel is fixed at the front end of a planetary frame of the planetary reduction mechanism or integrally arranged, a pinion is coaxially arranged on the planetary output wheel, and the pinion is meshed with a big gear sleeved on a toothed disc positioning sleeve through a one-way clutch; the chain wheel positioning sleeve is sleeved on the middle shaft, and the front part of the chain wheel positioning sleeve extends out of the shell to fix the chain wheel; the sun gear is arranged on the cantilever shaft and meshed with a plurality of planet gears arranged in the planet carrier; and the planet output wheel is provided with a central shaft which is coaxially arranged with the core shaft, and the central shaft is assembled in the shell through an output wheel bearing.
Furthermore, the planetary reduction mechanism comprises the sun gear, the plurality of planetary gears, the planet carrier and an inner gear ring, wherein the inner gear ring is fixed in the shell and positioned on the periphery of the planet carrier, and is meshed with each planetary gear; each planetary gear is positioned between the planetary carrier and the planetary output wheel, each planetary gear is assembled on the corresponding planetary shaft through a plurality of planetary bearings, and two ends of each planetary shaft are respectively fixed on the planetary carrier and the planetary output wheel.
Furthermore, the invention also comprises a torque sensing mechanism which comprises a deformation shaft sleeve fixed on the middle shaft and a signal output assembly electrically connected with a controller of the electric bicycle, wherein the deformation shaft sleeve is provided with a strain gauge electrically connected with the signal output assembly, and the front end of the deformation shaft sleeve is connected with the chain wheel positioning sleeve through a one-way ratchet mechanism.
Furthermore, the signal output assembly comprises an inner assembly and an outer assembly, wherein the inner assembly comprises an inner support sleeve fixed on the deformation shaft sleeve, and an inner PCB and an inner induction coil which are arranged on the inner support sleeve, and the inner PCB is electrically connected with the inner induction coil and the strain gauge; the outer assembly comprises an outer support sleeve which is fixed in the shell and positioned at the periphery of the inner support sleeve, an outer induction coil and an outer PCB which are arranged on the outer support sleeve, the outer induction coil is in induction fit with the inner induction coil, the outer induction coil is electrically connected with the outer PCB, and the outer PCB is connected with a lead-out wire which extends out of the shell and is connected with a controller of the electric bicycle.
Particularly preferably, the fixing structure of the outer support sleeve in the shell adopts the following unique design:
the shell is formed by sequentially fastening and fixing a front end cover, a middle shell and a machine core sealing cover, the middle shell and the machine core sealing cover are fastened to form a machine core cavity for accommodating the machine core, and the middle shell and the front end cover are fastened to form a transmission cavity for accommodating the planetary reduction mechanism, the planetary output wheel, the pinion, the gearwheel, the one-way clutch and the chain wheel positioning sleeve; the lower part of the middle shell is integrally connected with a middle shaft assembling pipe, a front pipe orifice of the middle shaft assembling pipe is opposite to an end cover shaft hole arranged on a front end cover, and two ends of a middle shaft respectively extend out of a rear pipe orifice of the middle shaft assembling pipe and the end cover shaft hole; the chain wheel positioning sleeve extends out of the shaft hole of the end cover to fix the chain wheel; the outer support sleeve is inserted into the middle shaft assembly pipe from the front pipe orifice inwards for assembly and is matched with the inner periphery of the middle shaft assembly pipe for rotation stopping through a key groove structure; one end of the outer support sleeve, which faces the chain wheel positioning sleeve, is a rear end, the other end of the outer support sleeve is a front end, the periphery of the rear end of the outer support sleeve is used for fixing the outer induction coil, and a protective pressing sleeve used for protecting the outer induction coil is tightly sleeved on the periphery of the outer induction coil; a stopping step part abutting against the front end of the outer support sleeve is formed at the position, close to the rear pipe orifice, of the inner periphery of the middle shaft assembly pipe, a first hole snap spring is embedded at the position, close to the front pipe orifice, of the inner periphery of the middle shaft assembly pipe, and the first hole snap spring abuts against the end part of the protection pressing sleeve to match with the stopping step part to perform axial limiting on the outer support sleeve. The fixing structure for the outer supporting sleeve does not need to be fastened by screws as in the conventional technology, is more simple and convenient to assemble in a narrow space of the middle shaft assembling pipe, and can improve the assembling efficiency.
Furthermore, the outer PCB is provided with a pedal frequency measuring Hall sensor, and the middle shaft is fixed with a pedal frequency measuring magnetic ring matched with the pedal frequency measuring Hall sensor.
Particularly preferably, the following unique design is adopted for the axial positioning structure of the middle shaft in the middle shaft assembly pipe in the invention:
a middle shaft support bearing for supporting a middle shaft is arranged in the rear pipe orifice of the middle shaft assembling pipe, the outer side of the middle shaft support bearing is abutted against a circle of retaining edges formed on the inner periphery of the rear pipe orifice, and the inner side of the middle shaft support bearing is abutted against a second hole embedded on the inner periphery of the middle shaft assembling pipe through a clamp spring, so that the middle shaft support bearing is axially positioned; meanwhile, a middle shaft step part which is connected with the middle shaft support bearing outwards and abutted against the middle shaft support bearing is arranged on the middle shaft, and a shaft clamping spring is embedded on the middle shaft outside the middle shaft support bearing and abutted against the middle shaft support bearing inwards, so that the middle shaft is axially positioned.
Specifically, the central support bearing is preferably a deep groove ball bearing.
Furthermore, the middle shell is provided with a mandrel opening through which the mandrel passes, a front mandrel bearing is arranged in the mandrel opening to support the mandrel, and the tail end of the mandrel is assembled on the mandrel sealing cover through a rear mandrel bearing; the central shaft is assembled on the front end cover through an output wheel bearing; an outer sleeve bearing sleeved on the periphery of the chain wheel positioning sleeve is arranged in the shaft hole of the end cover, and the inner periphery of the chain wheel positioning sleeve is supported on the middle shaft through at least two inner sleeve bearings arranged side by side; and a large gear bearing for supporting the large gear is further arranged on the periphery of the chain wheel positioning sleeve.
Further preferably, the movement is of an outer stator inner rotor structure, and the mandrel is fixed with the rotor.
The actual working principle of the invention is as follows:
like the known technology, cranks are arranged at two ends of a middle shaft, pedals are arranged on the cranks, a chain wheel is connected with a driving wheel of the electric bicycle through a chain, and a one-way needle clutch is usually adopted as the one-way clutch.
When the movement works, namely in an auxiliary riding state, a person treads the middle shaft to enable the torque sensing mechanism to generate a sensing signal to the controller to drive the movement to run at a high speed. In this state, the rotation speed of the pedal central shaft is far less than that of the mandrel, so the one-way clutch is occluded, the pawl and the ratchet of the one-way ratchet mechanism are disengaged, and the mandrel drives the chain wheel positioning sleeve and the upper chain wheel thereof to rotate to output power through the meshing of the planetary speed reducing mechanism, the large gear and the small gear. Because of the releasing relation of the one-way ratchet mechanism, the chain wheel positioning sleeve is released from the middle shaft, the middle shaft is prevented from rotating along with the rotation, and the operation of the machine core cannot interfere with the operation of the middle shaft.
In the riding or sliding process of a person, the machine core is in a speed reduction or non-working state, the rotating speed of the person pedaling the central shaft is higher than that of the central shaft, so that the inner ring and the outer ring of the one-way clutch are disengaged, and the one-way ratchet mechanism is engaged, so that the pedaling force of the person pedaling can be transmitted to the chain wheel positioning sleeve and the chain wheel thereof through the central shaft, the deformation shaft sleeve and the engaged one-way ratchet mechanism, and the electric bicycle is driven to move by the output power of the chain wheel. Because the inner and outer rings of the one-way clutch are disengaged, the rotation of the central shaft cannot cause interference to the rotation of the mandrel.
The invention has the advantages that:
1. the mandrel in the invention does not adopt a long shaft through design like the prior art, the front part of the mandrel extends into the planet carrier to form a cantilever shaft which is only used for supporting the planet carrier, and the planet output wheel is supported and assembled on the shell through a special output wheel bearing. Because the load pressure of the mandrel is reduced, the conditions of strength reduction and deformation after long-term work of the mandrel can be effectively prevented, the instability of the internal mechanism of the middle motor after long-term operation is eliminated, the operation noise is reduced, and the work reliability is greatly improved.
The mandrel of the core in the invention does not need to be connected and assembled with the planet output wheel and the shell, so that special design and processing are not needed, and the core can completely adopt the existing modularized core during corresponding actual production, thereby saving the production cost, simplifying the assembly process and greatly improving the production and assembly efficiency of the mid-set motor.
In a further scheme of the invention, the planet output wheel is matched with the planet carrier to fix two ends of the planet shaft, and then the planet gear is assembled.
The fixing structure of the outer support sleeve in the shell is simple in design, the outer support sleeve is not required to be fastened to the shell by means of screws as in the conventional technology, the outer support sleeve is quite convenient to assemble, and the fixing structure is particularly suitable for being operated in a narrow space of a middle shaft assembling pipe, so that the assembling efficiency is improved.
The axial positioning structure of the middle shaft in the middle shaft assembly pipe is simple in design, the axial positioning structure is not required to be completed by forming a plurality of shaft shoulders on the middle shaft and assembling the shaft shoulders with the deformed shaft sleeve like the conventional technology, but the axial positioning structure can be realized only by using one middle shaft support bearing, the clamp springs for the two side holes of the middle shaft support bearing and one step part formed on the middle shaft, the positioning structure is extremely simple in assembly, the complex processing of the middle shaft is reduced, the production cost can be saved, and the assembly efficiency is improved.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a front cross-sectional view of one embodiment of the present invention.
Wherein: 1. a housing; 1a, a front end cover; 1b, a middle shell; 1c, a machine core sealing cover; 2. a middle shaft; 2a, a middle shaft step part; 3. a movement; 3a, a mandrel; 3b, a stator; 3c, a rotor; 4. a chain wheel positioning sleeve; 5. a planet carrier; 6. a planetary output wheel; 7. a pinion gear; 8. a one-way clutch; 9. a bull gear; 10. a chain wheel; 11. a planet carrier bearing; 12. a sun gear; 13. a planetary gear; 14. a central shaft; 15. an output wheel bearing; 16. an inner gear ring; 17. a planetary bearing; 18. a planet shaft; 19. a deformable shaft sleeve; 20. a one-way ratchet mechanism; 21. an inner support sleeve; 22. an outer support sleeve; 23. a middle shaft mounting pipe; 23a, a stop step part; 23b, blocking edges; 24. an end cover shaft hole; 25. protecting the pressing sleeve; 26. the clamp spring is used for the first hole; 27. a step frequency measuring magnetic ring; 28. the middle shaft supports the bearing; 29. the clamp spring is used for the second hole; 30. a clamp spring for the shaft; 31. a front spindle bearing; 32. a rear spindle bearing; 33. sleeving an outer bearing; 34. a sleeve inner bearing; 35. and a bull gear bearing.
Detailed Description
Example (b): the following description will be made with reference to fig. 1 for a specific embodiment of the high-stability mid-motor using a planetary reduction mechanism according to the present invention:
the invention provides a high-stability middle-mounted motor adopting a planetary reduction mechanism, which is provided with a shell 1 with a middle shaft 2 penetrating through the lower part, a machine core 3 arranged in the shell 1, the planetary reduction mechanism, a torque sensing mechanism and a toothed disc positioning sleeve 4, as in the prior art. In this embodiment, the movement 3 is an outer stator 3b and an inner rotor 3c, and the spindle 3a and the rotor 3c are fixed. The spindle 3a is connected with a planetary reduction mechanism. The planetary reduction mechanism is composed of a sun gear 12, three planetary gears 13 which are distributed around the sun gear 12 at equal angles, a planet carrier 5 and an inner gear ring 16, wherein the front end of the planet carrier 5 is fixed with a planetary output wheel 6 through screws. A pinion 7 coaxially arranged is formed at the front end of the planetary output wheel 6, and the pinion 7 is meshed with a gearwheel 9 sleeved on the chain wheel positioning sleeve 4 through a one-way clutch 8; the chain wheel positioning sleeve 4 is sleeved on the middle shaft 2, the front part of the chain wheel positioning sleeve extends out of the shell 1 to fix the chain wheel 10, and the chain wheel 10 is connected with a driving wheel of the electric bicycle through a chain.
An inner gear ring 16 in the planetary reduction mechanism is fixed in the shell 1 and positioned on the periphery of the planet carrier 5, and the inner gear ring 16 is meshed with each planetary gear 13; each planet gear 13 is located between the planet carrier 5 and the planet output wheel 6, and each planet gear 13 is mounted on a respective planet shaft 18 by means of two planet bearings 17, while each planet shaft 18 is fixed at both ends to the planet carrier 5 and the planet output wheel 6, respectively.
The core improvement of the invention is that the planet carrier 5 is supported and arranged on the mandrel 3a through the planet carrier bearing 11, the front part of the mandrel 3a extends into the planet carrier 5 to form a cantilever shaft, and the sun gear 12 arranged on the cantilever shaft is meshed with each planet gear 13 arranged in the planet carrier 5; and the front end of the planetary output wheel 6 is formed with a central shaft 14 coaxially arranged with the core shaft 3a, and the central shaft 14 is assembled in the housing 1 through an output wheel bearing 15.
Further referring to fig. 1, the housing 1 in this embodiment is formed by sequentially fastening and fixing a front end cover 1a, a middle case 1b and a movement cover 1c, the middle case 1b and the movement cover 1c are fastened to form a movement chamber for accommodating the movement 3, a spindle opening through which the spindle 3a passes is formed in the middle case 1b, a front spindle bearing 31 is arranged in the spindle opening to support the spindle 3a, and the end of the spindle 3a is assembled on the movement cover 1c through a rear spindle bearing 32.
The middle shell 1b and the front end cover 1a are buckled to form a transmission chamber for accommodating the planetary reduction mechanism, the planetary output wheel 6, the pinion 7, the bull gear 9, the one-way clutch 8 and the chain wheel positioning sleeve 4; a middle shaft assembling pipe 23 is integrally connected to the lower part of the middle shell 1b, a front nozzle of the middle shaft assembling pipe 23 is opposite to an end cover shaft hole 24 arranged on the front end cover 1a, and two ends of the middle shaft 2 respectively extend out of a rear nozzle of the middle shaft assembling pipe 23 and the end cover shaft hole 24 to fix a crank (not marked in the figure); the crankset locating sleeve 4 extends out of the end cover shaft hole 24 to fix the crankset 10. Specifically, as shown in fig. 1, an outer sleeve bearing 33 sleeved on the outer periphery of the chain wheel positioning sleeve 4 is arranged in the end cover shaft hole 24, and the inner periphery of the chain wheel positioning sleeve 4 is supported on the middle shaft 2 through two inner sleeve bearings 34 arranged side by side; and a bull gear bearing 35 for supporting the bull gear 9 is further arranged on the periphery of the chain wheel positioning sleeve 4. The central shaft 14 of the planetary output wheel 6 is mounted on the front end cover 1a via an output wheel bearing 15.
As shown in fig. 1, the torque sensing mechanism in this embodiment is composed of a deformable sleeve 19 fixed on the bottom bracket 2 and a signal output assembly electrically connected to a controller of the electric bicycle, wherein a strain gauge electrically connected to the signal output assembly is disposed on the deformable sleeve 19, and the front end of the deformable sleeve 19 is connected to the chain wheel positioning sleeve 4 through a one-way ratchet mechanism 20. The signal output assembly consists of an inner assembly and an outer assembly, wherein the inner assembly consists of an inner support sleeve 21 fixed on the deformation shaft sleeve 19, and an inner PCB (not shown in the figure) and an inner induction coil (not shown in the figure) which are arranged on the inner support sleeve 21, and the inner PCB is electrically connected with the inner induction coil and the strain gauge; the outer assembly is composed of an outer support sleeve 22 fixed in the shell 1 and positioned at the periphery of the inner support sleeve 21, an outer induction coil (not shown in the figure) arranged on the outer support sleeve 22 and an outer PCB (not shown in the figure), the outer induction coil is in induction fit with the inner induction coil and is electrically connected with the outer PCB, and the outer PCB is connected with a lead-out wire which extends out of the shell 1 and is connected with a controller of the electric bicycle. The outer PCB is also provided with a pedal frequency measuring Hall sensor (not shown in the figure), and the middle shaft 2 is fixed with a pedal frequency measuring magnetic ring 27 matched with the pedal frequency measuring Hall sensor.
The invention adopts the following unique design for the fixing structure of the outer supporting sleeve 22 in the shell 1:
as shown in fig. 1, the outer support sleeve 22 is inserted into the middle shaft mounting pipe 23 from the front pipe opening and is fitted, and is engaged with the inner periphery of the middle shaft mounting pipe 23 by a key groove structure to stop rotation; one end of the outer supporting sleeve 22 facing the chain wheel positioning sleeve 4 is a rear end, the other end is a front end, the periphery of the rear end is used for fixing the outer induction coil, and a protective pressing sleeve 25 used for protecting the outer induction coil is tightly sleeved on the periphery of the outer induction coil; a stopping step part 23a abutting against the front end of the outer support sleeve 22 is formed on the inner periphery of the middle shaft assembling pipe 23 close to the rear pipe orifice, and a first hole snap spring 26 is embedded on the inner periphery of the middle shaft assembling pipe 23 close to the front pipe orifice and abuts against the end part of the protective pressing sleeve 25 so as to cooperate with the stopping step part 23a to axially limit the outer support sleeve 22.
The axial positioning structure of the middle shaft 2 in the middle shaft assembling pipe 23 adopts the following unique design:
a middle shaft supporting bearing 28 for supporting the middle shaft 2 is arranged in the rear pipe orifice of the middle shaft assembling pipe 23, the outer side of the middle shaft supporting bearing 28 is abutted against a circle of blocking edge 23b formed on the inner periphery of the rear pipe orifice, and the inner side of the middle shaft supporting bearing 28 is abutted against a second hole embedded on the inner periphery of the middle shaft assembling pipe 23 by using a snap spring 29, so that the middle shaft supporting bearing 28 is axially positioned; meanwhile, the middle shaft 2 is provided with a middle shaft step part 2a which is outwards abutted against the middle shaft support bearing 28, and the middle shaft 2 at the outer side of the middle shaft support bearing 28 is embedded with a shaft snap spring 30 which is inwards abutted against the middle shaft support bearing 28, so that the middle shaft 2 is axially positioned. And the mid-shaft support bearing 28 is a deep groove ball bearing.
It should be understood that the above-mentioned embodiments are only illustrative of the technical concepts and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All modifications made according to the spirit of the main technical scheme of the invention are covered in the protection scope of the invention.
Claims (10)
1. A high-stability mid-motor adopting a planetary reduction mechanism comprises a shell (1) with a middle shaft (2) penetrating through the lower part, a machine core (3) arranged in the shell (1), the planetary reduction mechanism and a chain wheel positioning sleeve (4); a core shaft (3 a) of the machine core (3) is connected with a planetary reduction mechanism, a planetary output wheel (6) is fixed at the front end of a planetary frame (5) of the planetary reduction mechanism or integrally arranged, a pinion (7) is coaxially arranged on the planetary output wheel (6), and the pinion (7) is meshed with a large gear (9) which is sleeved on a toothed disc positioning sleeve (4) through a one-way clutch (8); the chain wheel positioning sleeve (4) is sleeved on the middle shaft (2), and the front part of the chain wheel positioning sleeve extends out of the shell (1) to fix the chain wheel (10); the sun gear is characterized in that the planet carrier (5) is supported and arranged on the mandrel (3 a) through a planet carrier bearing (11), the front part of the mandrel (3 a) extends into the planet carrier (5) to form a cantilever shaft, and a sun gear (12) arranged on the cantilever shaft is meshed with a plurality of planet gears (13) arranged in the planet carrier (5); the planetary output wheel (6) is provided with a central shaft (14) coaxially arranged with the mandrel (3 a), and the central shaft (14) is assembled in the shell (1) through an output wheel bearing (15).
2. The mid-motor with high stability and adopting the planetary reduction mechanism according to claim 1 is characterized in that the planetary reduction mechanism comprises the sun gear (12), the plurality of planetary gears (13), the planet carrier (5) and an inner gear ring (16), the inner gear ring (16) is fixed in the shell (1) and is positioned at the periphery of the planet carrier (5), and the inner gear ring (16) is meshed with each planetary gear (13); each planetary gear (13) is positioned between the planet carrier (5) and the planetary output wheel (6), each planetary gear (13) is assembled on a corresponding planetary shaft (18) through a plurality of planetary bearings (17), and two ends of each planetary shaft (18) are respectively fixed on the planet carrier (5) and the planetary output wheel (6).
3. The mid-motor with high stability and adopting the planetary reduction mechanism according to claim 1 is characterized by further comprising a torque sensing mechanism, wherein the torque sensing mechanism comprises a deformation shaft sleeve (19) fixed on the middle shaft (2) and a signal output assembly electrically connected with a controller of the electric bicycle, a strain gauge electrically connected with the signal output assembly is arranged on the deformation shaft sleeve (19), and meanwhile, the front end of the deformation shaft sleeve (19) is connected with the chain wheel positioning sleeve (4) through a one-way ratchet mechanism (20).
4. The mid-motor with high stability and adopting the planetary reduction mechanism according to claim 3 is characterized in that the signal output assembly comprises an inner assembly and an outer assembly, wherein the inner assembly comprises an inner supporting sleeve (21) fixed on the deformation shaft sleeve (19) and an inner PCB board and an inner induction coil which are arranged on the inner supporting sleeve (21), and the inner PCB board is electrically connected with the inner induction coil and the strain gauge; the outer assembly comprises an outer support sleeve (22) which is fixed in the shell (1) and positioned at the periphery of the inner support sleeve (21), an outer induction coil and an outer PCB which are arranged on the outer support sleeve (22), the outer induction coil is in induction fit with the inner induction coil, the outer induction coil is electrically connected with the outer PCB, and an outgoing line connected to the outer PCB extends out of the shell (1) to be connected with a controller of the electric bicycle.
5. The high-stability centrally-mounted motor adopting a planetary reduction mechanism according to claim 4 is characterized in that the shell (1) is formed by sequentially fastening and fixing a front end cover (1 a), a middle shell (1 b) and a machine core sealing cover (1 c), the middle shell (1 b) and the machine core sealing cover (1 c) are fastened to form a machine core chamber for accommodating the machine core (3), and the middle shell (1 b) and the front end cover (1 a) are fastened to form a transmission chamber for accommodating the planetary reduction mechanism, a planetary output wheel (6), a pinion (7), a bull gear (9), a one-way clutch (8) and a chain wheel positioning sleeve (4); a middle shaft assembling pipe (23) is integrally connected with the lower part of the middle shell (1 b), the front pipe orifice of the middle shaft assembling pipe (23) is opposite to an end cover shaft hole (24) arranged on the front end cover (1 a), and two ends of the middle shaft (2) respectively extend out of the rear pipe orifice of the middle shaft assembling pipe (23) and the end cover shaft hole (24); the chain wheel positioning sleeve (4) extends out of the end cover shaft hole (24) to fix the chain wheel (10); the outer support sleeve (22) is inserted into the middle shaft assembly pipe (23) from a front pipe opening to be assembled, and is matched with the inner periphery of the middle shaft assembly pipe (23) through a key groove structure to stop rotating; one end of the outer supporting sleeve (22) facing the chain wheel positioning sleeve (4) is a rear end, the other end of the outer supporting sleeve is a front end, the periphery of the rear end of the outer supporting sleeve is used for fixing the outer induction coil, and a protective pressing sleeve (25) used for protecting the outer induction coil is tightly sleeved on the periphery of the outer induction coil; a stopping step part (23 a) which is abutted against the front end of the outer support sleeve (22) is formed on the inner periphery of the middle shaft assembling pipe (23) close to the rear pipe orifice, a first hole snap spring (26) is embedded on the inner periphery of the middle shaft assembling pipe (23) close to the front pipe orifice, and the first hole snap spring (26) is abutted against the end part of the protective pressing sleeve (25) to match with the stopping step part (23 a) to carry out axial limit on the outer support sleeve (22).
6. The mid-motor with high stability and adopting the planetary reduction mechanism as claimed in claim 4, wherein the outer PCB is provided with a pedal frequency measuring Hall sensor, and the middle shaft (2) is fixed with a pedal frequency measuring magnetic ring (27) matched with the pedal frequency measuring Hall sensor.
7. The mid-motor with high stability and employing the planetary reduction mechanism according to claim 5, wherein the rear nozzle of the central shaft assembly pipe (23) is provided with a central shaft support bearing (28) for supporting the central shaft (2), the outer side of the central shaft support bearing (28) abuts against a ring of retaining edge (23 b) formed on the inner periphery of the rear nozzle, and the inner side of the central shaft support bearing (28) abuts against a second hole formed on the inner periphery of the central shaft assembly pipe (23) by a snap spring (29), so that the central shaft support bearing (28) is axially positioned; meanwhile, a middle shaft step part (2 a) which is connected outwards and abuts against a middle shaft support bearing (28) is arranged on the middle shaft (2), a shaft clamp spring (30) is embedded on the middle shaft (2) at the outer side of the middle shaft support bearing (28) and connected inwards and abuts against the middle shaft support bearing (28), and therefore the middle shaft (2) is axially positioned.
8. The mid-motor with high stability employing the planetary reduction mechanism according to claim 7, wherein the mid-shaft support bearing (28) is a deep groove ball bearing.
9. The mid-motor with high stability and adopting the planetary reduction mechanism according to claim 5 is characterized in that the middle shell (1 b) is provided with a mandrel opening for the mandrel (3 a) to pass through, a front mandrel bearing (31) is arranged in the mandrel opening to support the mandrel (3 a), and the tail end of the mandrel (3 a) is assembled on the core cover (1 c) through a rear mandrel bearing (32); the central shaft (14) is assembled on the front end cover (1 a) through an output wheel bearing (15); an outer sleeve bearing (33) sleeved on the periphery of the chain wheel positioning sleeve (4) is arranged in the end cover shaft hole (24), and meanwhile, the inner periphery of the chain wheel positioning sleeve (4) is supported on the middle shaft (2) through at least two inner sleeve bearings (34) arranged side by side; and a large gear bearing (35) for supporting the large gear (9) is further arranged on the periphery of the chain wheel positioning sleeve (4).
10. The mid-motor with high stability and adopting the planetary reduction mechanism according to claim 1 is characterized in that the movement (3) is of an outer stator (3 b) and inner rotor (3 c) structure, and the mandrel (3 a) is fixed with the rotor (3 c).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210172435.9A CN114408083A (en) | 2022-02-24 | 2022-02-24 | High-stability middle-placed motor adopting planetary reduction mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210172435.9A CN114408083A (en) | 2022-02-24 | 2022-02-24 | High-stability middle-placed motor adopting planetary reduction mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN114408083A true CN114408083A (en) | 2022-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210172435.9A Pending CN114408083A (en) | 2022-02-24 | 2022-02-24 | High-stability middle-placed motor adopting planetary reduction mechanism |
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| Country | Link |
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| CN (1) | CN114408083A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115042908A (en) * | 2022-07-29 | 2022-09-13 | 广东威灵电机制造有限公司 | Mid-set motor and electric bicycle |
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2022
- 2022-02-24 CN CN202210172435.9A patent/CN114408083A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115042908A (en) * | 2022-07-29 | 2022-09-13 | 广东威灵电机制造有限公司 | Mid-set motor and electric bicycle |
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