Coaxial multi-speed transmission structure

Abstract

The utility model provides a coaxial multi-speed transmission structure, and belongs to the technical field of transmission equipment. A first speed output part of the coaxial multi-speed transmission structure is in transmission connection with an output shaft of a power output mechanism; the first planetary gear set is in transmission connection with the output shaft, and the second speed output part is installed on the first planetary gear set; the second planetary gear set is in transmission connection with the second speed output part, and the third speed output part is installed on the second planetary gear set. The first speed output part, the second speed output part and the third speed output part are designed to coaxially output different speeds, so that the size of the transmission structure is reduced, the installation space is reduced, and when different rotating speeds are needed, the speed can be adjusted according to actual conditions. The tool bit, the stirring head and other tools are installed on the first speed output part, the second speed output part or the third speed output part, the output direction does not need to be converted, operation is more convenient, transmission does not need to be changed in direction, and the transmission structure is simple, compact, low in noise and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to transmission equipment technical field, concretely relates to a coaxial multi-speed transmission structure. BACKGROUND

[0002] The planetary gear transmission is a kind of gear transmission structure, at least one gear and its axis of rotation around the fixed shaft, its structure mainly includes: sun gear, planetary gear and planetary carrier three parts.Most planetary gear transmissions adopt internal gear, and usually multiple planetary gears simultaneously transmit load, so that power is shunted, and thus has the advantages of compact structure, small volume and mass, large transmission ratio range, high transmission efficiency, stable operation, low noise, differential planetary gear transmission can also be used for the synthesis and decomposition of motion or for variable speed transmission, and thus is widely used in the fields of hoisting, transportation, engineering machinery, aerospace, precision medical instruments and the like as reduction, speed-up or variable speed gear transmission device.

[0003] However, the current planetary gear transmission can only output a single speed, cannot simultaneously realize coaxial multi-speed output, when multiple speeds need to be output, can only be output by engaging different transmission gears, and the output direction is converted to realize multi-speed output, so not only the complexity of the internal structure of the mechanism is increased, interference between each speed output structure can be caused, and due to the engagement of transmission gears of different speed outputs, the volume and cost of the mechanism are increased. CONTENT OF THE UTILITY MODEL

[0004] Therefore, in order to solve the problems in the prior art, the utility model provides a coaxial multi-speed transmission structure, and the technical problems to be solved are how to realize coaxial output of multiple speeds without converting the output direction, reduce the volume of transmission structure and reduce the cost.

[0005] The utility model solves the above-mentioned problems by the following technical means:

[0006] A coaxial multi-speed transmission structure, comprising:

[0007] A power output mechanism;

[0008] A first speed output mechanism, the first speed output mechanism includes a first speed output part, and the first speed output part is in transmission connection with the output shaft of the power output mechanism;

[0009] A second speed output mechanism, the second speed output mechanism includes a first planetary gear set and a second speed output part, the first planetary gear set is in transmission connection with the output shaft, and the second speed output part is installed on the first planetary gear set;

[0010] A third speed output mechanism, comprising a second planetary gear set and a third speed output part, the second planetary gear set being in transmission connection with the second speed output part, and the third speed output part being installed on the second planetary gear set;

[0011] The first speed output part, the second speed output part, the third speed output part and the output shaft are coaxially arranged.

[0012] In the coaxial multi-speed transmission structure, the power output mechanism serves as a power source to drive the output shaft to rotate. The first speed output part is in transmission connection with the output shaft, i.e., the first speed output part outputs the first speed. The first speed planetary gear set is in transmission connection with the output shaft of the power output mechanism. The rotational speed of the output shaft is reduced in the first speed planetary gear set to form the second speed. The second speed output part is installed on the first planetary gear set, i.e., the second speed output part outputs the second speed. The second speed planetary gear set is in transmission connection with the second speed output part. The second planetary gear set reduces the rotational speed of the second speed output part to form the second speed. The third speed output part is installed on the second planetary gear set, i.e., the third speed output part outputs the third speed. The first speed output part, the second speed output part, the third speed output part and the output shaft of the power output mechanism are coaxially arranged. That is, the coaxial multi-speed transmission structure outputs different speeds through the coaxial arrangement of the first speed output part, the second speed output part and the third speed output part. This not only reduces the size of the transmission structure and the installation space, but also allows the tool such as the cutter head or the stirring head to be installed on the first speed output part 21, the second speed output part 32 or the third speed output part 42 according to the actual situation when different rotational speeds are required. The output direction does not need to be converted, the operation is more convenient, the transmission does not need to change direction, the transmission structure is simple and compact, the noise is low, and the cost is low.

[0013] In the coaxial multi-speed transmission structure, the power output mechanism comprises a motor and an end cover. The output shaft of the motor is in transmission connection with the first speed output part through the end cover.

[0014] In the coaxial multi-speed transmission structure, the first planetary gear set comprises a first gear carrier, a first planet carrier and a plurality of first planetary gears. The first gear carrier is installed on the end cover of the power output mechanism. The inner side wall of the first gear carrier is provided with a first inner tooth. The output shaft is provided with a first sun gear tooth. The first planet carrier is gap-set outside the output shaft. The plurality of first planetary gears are installed on the first planet carrier and driven to rotate. The plurality of first planetary gears are located between the first sun gear tooth and the first inner tooth. Each first planetary gear is in meshing connection with the first sun gear tooth and the first inner tooth. The second speed output part is installed on the first planet carrier and rotates with the first planet carrier.

[0015] In the coaxial multi-speed transmission structure, the second planetary gear set comprises a second gear carrier, a second planet carrier and a plurality of second planetary gears, the second gear carrier is installed on the end cover of the power output mechanism, the inner side wall of the second gear carrier is provided with a second inner gear, the second speed output part is provided with a second sun gear tooth, the second planet carrier is sleeved outside the second speed output part, the plurality of second planetary gears are installed on the second planet carrier and driven to rotate, the plurality of second planet carriers are located between the second sun gear tooth and the second inner gear, each second planetary gear is respectively meshed with the second sun gear tooth and the second inner gear, and the third speed output part is installed on the second planet carrier and rotates with the second planet carrier.

[0016] In the coaxial multi-speed transmission structure, the first speed output part comprises a first connector, and the first connector is installed on the end of the output shaft.

[0017] In the coaxial multi-speed transmission structure, the second speed output part comprises a first connecting frame and a second connector, the lower end of the first connecting frame is installed on the first planet carrier and rotates with the first planet carrier, the outer circumferential surface of the first connecting frame is provided with the second sun gear tooth, and the second connector is installed on the upper end of the first connecting frame.

[0018] In the coaxial multi-speed transmission structure, the third speed output part comprises a second connecting frame and a third connector, the lower end of the second connecting frame is installed on the second planet carrier, and the third connector is installed on the upper end of the second connecting frame.

[0019] In the coaxial multi-speed transmission structure, the first connector, the second connector and the third connector are sequentially and gap-sleeved arranged from inside to outside, and the first connector, the second connector, the third connector and the output shaft are coaxially arranged.

[0020] In the coaxial multi-speed transmission structure, the second connector is externally sleeved with a first bearing, and the first bearing is installed on the second connecting frame.

[0021] In the coaxial multi-speed transmission structure, the second connecting frame is externally sleeved with a second bearing, and the second bearing is installed on the second gear carrier.

[0022] Compared with the prior art, the coaxial multi-speed transmission structure has the following advantages:

[0023] The coaxial multi-speed transmission structure of the application, by designing the first speed output part, the second speed output part and the third speed output part into coaxial output of different speeds, not only reduces the volume of the transmission structure and the installation space, but also when different rotating speeds are needed, the tool such as the cutter head and the stirring head can be installed on the first speed output part, the second speed output part or the third speed output part according to the actual situation, without the need of converting the output direction, the operation is more convenient, the transmission does not need to change the direction, the transmission structure is simple, compact, low noise and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Fig. 1 is a structural schematic diagram of the coaxial multi-speed transmission structure of the application;

[0025] Figure 2 Fig. 2 is a sectional view of the coaxial multi-speed transmission structure of the application;

[0026] Figure 3 Fig. 3 is an enlarged view of A part in Fig. 1; Figure 2 Fig. 4 is an enlarged view of B part in Fig. 1;

[0027] Figure 4 Fig. 5 is an exploded view of the coaxial multi-speed transmission structure of the application. Figure 2

[0028] Figure 5

[0029] Wherein, the meaning of the reference signs is as follows:

[0030] 1, power output mechanism; 11, motor; 12, end cover; 13, output shaft; 131, first sun gear tooth; 2, first speed output mechanism; 21, first speed output part; 211, first connector; 3, second speed output mechanism; 31, first planetary gear set; 311, first gear carrier; 3111, first inner tooth; 312, first planet carrier; 313, first planetary gear; 32, second speed output part; 321, first connecting frame; 322, second connector; 3221, first bearing; 323, second sun gear tooth; 4, third speed output mechanism; 41, second planetary gear set; 411, second gear carrier; 4111, second inner tooth; 412, second planet carrier; 413, second planetary gear; 42, third speed output part; 421, second connecting frame; 4211, second bearing; 422, third connector. DETAILED DESCRIPTION

[0031] In order to better understand and implement, the technical solutions in the embodiments of the application will be clearly and completely described below in combination with the drawings in the embodiments of the application.

[0032] ​​Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0033] Planetary gear drives are gear transmission structures in which at least one gear and its axis rotate around a fixed axis. Their structure mainly consists of three parts: the sun gear, planet gears, and the planet carrier. Planetary gear drives mostly use internal meshing gears, and typically multiple planet gears transmit loads simultaneously, allowing power to be distributed and transmitted. Therefore, they have advantages such as compact structure, small size and weight, large transmission ratio range, high transmission efficiency, smooth operation, and low noise. Differential planetary gear drives can also be used for motion synthesis and decomposition or for speed change transmissions, and are therefore widely used in hoisting, transportation, construction machinery, aerospace, precision medical instruments, and other fields as speed reduction, speed increase, or speed change gear transmission devices.

[0034] However, current planetary gear transmissions can only output a single speed and cannot simultaneously achieve coaxial multi-speed output. When multiple speeds are required, multiple motors must be integrated to achieve this, which not only increases the size and weight of the mechanism but also increases costs. In view of this, this utility model provides a coaxial multi-speed transmission structure to achieve coaxial output of multiple speeds without integrating multiple motors, which can greatly reduce the size and weight of the mechanism and reduce costs.

[0035] like Figures 1-5 As shown, this coaxial multi-speed transmission structure includes a power output mechanism 1, a first speed output mechanism 2, a second speed output mechanism 3, and a third speed output mechanism 4. The first speed output mechanism 2 includes a first speed output section 21, which is drivenly connected to the output shaft 13 of the power output mechanism 1. The second speed output mechanism 3 includes a first planetary gear set 31 and a second speed output section 32, which is drivenly connected to the output shaft 13 and mounted on the first planetary gear set 31. The third speed output mechanism 4 includes a second planetary gear set 41 and a third speed output section 42, which is drivenly connected to the second speed output section 32 and mounted on the second planetary gear set 41. The first speed output section 21, the second speed output section 32, the third speed output section 42, and the output shaft 13 are coaxially arranged.

[0036] In the coaxial multi-speed transmission structure, the power output mechanism 1 serves as a power source to drive the output shaft 13 to rotate. The first speed output part 21 is in transmission connection with the output shaft 13, that is, the first speed output part 21 outputs the first speed. The first planetary gear set 31 is in transmission connection with the output shaft 13 of the power output mechanism 1. The rotating speed of the output shaft 13 is reduced in the first planetary gear set 31 to form the second speed. The second speed output part 32 is installed on the first planetary gear set 31, that is, the second speed output part 32 outputs the second speed. The second planetary gear set 41 is in transmission connection with the second speed output part 32. The second planetary gear set 41 reduces the rotating speed of the second speed output part 32 to form the third speed. The third speed output part 42 is installed on the second planetary gear set 41, that is, the third speed output part 42 outputs the third speed. The first speed output part 21, the second speed output part 32, the third speed output part 42 and the output shaft 13 of the power output mechanism 1 are coaxially arranged. That is, the coaxial multi-speed transmission structure outputs different speeds through the first speed output part 21, the second speed output part 32 and the third speed output part 42. The volume of the transmission structure is reduced, and the installation space is reduced. When different rotating speeds are needed, the tool such as the cutter head or the stirring head can be installed on the first speed output part 21, the second speed output part 32 or the third speed output part 42 according to the actual situation. The output direction does not need to be converted, the operation is more convenient, the transmission does not need to change the direction, the transmission structure is simple and compact, the noise is low, and the cost is low.

[0037] As Figure 1 and 2As shown, it can be understood that the first speed output by the first speed output unit 21 is directly output by the power output mechanism 1, and its speed is the fastest; the second speed output by the second speed output unit 32 is slower than the first speed after being reduced by the first planetary gear set 31; the third speed output by the third speed output unit is slower than the second speed after being reduced by the second planetary gear set 41. In other words, the first speed output by the first speed output unit 21, located at the very center, is the fastest, corresponding to the second hand on a clock; the second speed output by the second speed output unit 32, located in the middle, is slower than the first speed, corresponding to the minute hand on a clock; and the third speed output by the third speed output unit 42, located on the outermost side, is slower than the second speed, corresponding to the hour hand on a clock. The first speed output unit 21, the second speed output unit 32, and the third speed output unit 42 of this coaxial multi-speed transmission structure rotate coaxially clockwise, with speeds divided into three levels: fast, slow, medium, and slow, corresponding to the seconds, minutes, and hours on a clock. In practical applications, the first speed output unit 21, the second speed output unit 32, and the third speed output unit 42 can be marked with the second hand, minute hand, and hour hand, respectively, making it clear to the user that the first speed output unit 21 has the fastest rotation speed, the second speed output unit 32 has a medium rotation speed, and the third speed output unit 42 has the slowest rotation speed. In actual use, for different items, the blade, stirring head, or other utensils can be installed on the first speed output unit 21, the second speed output unit 32, or the third speed output unit 42 to stir or crush different items, greatly improving the applicability of this coaxial multi-speed transmission mechanism.

[0038] like Figure 5 As shown, in this embodiment, the power output mechanism 1 includes a motor 11 and an end cover 12. The end cover 12 is the end cover of the motor 11 and is fixedly connected to the housing of the motor 11. The output shaft 13 of the motor 11 passes through the end cover 12 and extends out of the end cover 12. The output end of the motor 11 is drivenly connected to the output shaft 13. The end cover 12 is installed on the output end of the motor 11, and the output shaft 13 passes through the end cover 11 and is drivenly connected to the first speed output part 21. As one embodiment, the motor 11 is a brushless motor. Brushless motors can achieve stepless speed regulation, so that the speed of the output shaft 13 can be arbitrarily adjusted within the power range, improving the applicability of the coaxial multi-speed transmission mechanism.

[0039] like Figure 2 and Figure 5As shown, in the embodiment, the first planetary gear set 31 comprises a first gear carrier 311, a first planet carrier 312 and a plurality of first planetary gears 313. The first gear carrier 311 is mounted on the end cover 12, and the first gear carrier 311 is a first inner ring gear. The inner side wall of the first gear carrier 311 is provided with a first inner tooth 3111, the output shaft 13 is provided with a first sun gear tooth 131, the first planet carrier 312 is gap-set on the output shaft 13, the plurality of first planetary gears 313 are mounted on the first planet carrier 312 and driven to rotate, all the first planetary gears 313 are located between the first sun gear tooth 131 and the first inner tooth 3111, each of the first planetary gears 313 is respectively engaged with the first sun gear tooth 131 and the first inner tooth 3111, the first sun gear tooth 131 drives all the first planetary gears 313 to rotate around the first sun gear tooth 131, and all the first planetary gears 313 rotate around the first sun gear tooth 131 to drive the first planet carrier 312 to rotate. The second speed output part 32 is mounted on the first planet carrier 312 to realize the output of the second speed. In this structure, the outer circumferential surface of the output shaft 13 is directly machined with the first sun gear tooth 131, the first planet carrier 312 and the gap-set on the output shaft 13, avoiding the interference between the rotation of the first planet carrier 312 and the rotation of the output shaft 13, that is, realizing the isolation of the first speed output and the second speed output; the rotation shafts of the plurality of first planetary gears 313 are fixedly mounted on the first planet carrier 312, and the two sides of all the first planetary gears 313 are respectively engaged with the first sun gear tooth 131 and the first inner tooth 3111, thereby realizing the rotation and revolution of the first planetary gears 313.

[0040] The motor 11 drives the output shaft 13 to rotate, and the first sun gear tooth 131 outside the output shaft 13 drives all the first planetary gears 313 to rotate along the first inner tooth 3111 on the first gear carrier 311, that is, all the first planetary gears 313 revolve around the first sun gear tooth 131 while rotating, the first planetary gears 313 drive the first planet carrier 312 to rotate, thereby realizing the rotation of the second speed output part 32; the rotation speed of the output shaft 13 is reduced through the first planetary gear set 31, the first planet carrier 312 rotates at the second speed, and the second speed output part 32 is mounted on the first planet carrier 312, that is, the second speed output part 32 outputs the second speed, at this time, the rotation speed of the second speed is less than the first rotation speed of the output shaft 13. Since the second speed output part 32 is coaxial with the output shaft 13, the second speed output part 32 is a hollow shaft, and the output shaft 13 is gap-set in the second speed output part 32, avoiding the interference between the second speed and the first rotation speed.

[0041] As an embodiment, the first sun gear tooth 131, the first inner gear tooth 3111 and the outer tooth of the first planetary gear 313 are all helical teeth, which are in meshing transmission. The helical tooth line speed is relatively small compared with the straight tooth, the noise is low, and the coincidence coefficient is high. This makes the helical gear run more smoothly, with lower noise and stronger carrying capacity under high speed and heavy load conditions. The number of the first planetary gear 313 can be 2-4, preferably, the number of the first planetary gear 313 is 3, which is triangularly supported by the first planetary carrier 312. Not only the transmission is more stable, but also the space between the first sun gear tooth 131 and the first inner gear tooth 3111 can be used most effectively, so that the most first planetary gears 313 can be installed in a certain space.

[0042] As shown in Figure 2 and Figure 4 In this embodiment, the second planetary gear set 41 includes a second gear carrier 411, a second planetary carrier 412 and a plurality of second planetary gears 413. The second gear carrier 411 is installed on the end cover 12. The second gear carrier 411 is a second inner gear. The first gear carrier 311, the first planetary carrier 312 and a plurality of first planetary gears 313 are all installed in the second inner gear. The first gear carrier 311 is installed at the bottom of the inner side wall of the second inner gear. The inner side wall of the second inner gear is provided with a second inner gear tooth 4111. The second speed output part 32 is provided with a second sun gear tooth 323 corresponding to the circumferential surface of the second inner gear tooth 4111. The second planetary carrier 412 is gap-set on the second speed output part 32. The rotating shafts of the plurality of second planetary gears 413 are fixedly installed on the second planetary carrier 412 and drive the second planetary carrier 412 to rotate. All the second planetary gears 413 are located between the second sun gear tooth 323 and the second inner gear tooth 4111. All the second planetary gears 413 are respectively in meshing transmission with the second sun gear tooth 323 and the second inner gear tooth 4111. The second sun gear tooth 323 drives all the second planetary gears 413 to revolve around the second sun gear tooth 323 and in turn drives the second planetary carrier 412 to rotate. The third speed output part 42 is installed on the second planetary carrier 412 to realize the output of the third speed. Since the second speed output part 32 and the third speed output part 42 are coaxial, the third speed output part 42 is provided with a containing cavity, and the second speed output part 32 is gap-set in the containing cavity.

[0043] In the above structure, the bottom of the second speed output part 32 is fixedly connected with the first planetary carrier 312 and rotates with the first planetary carrier 312, the outer circumferential surface of the middle part of the second speed output part 32 corresponding to the second internal gear 4111 is provided with the second sun gear tooth 323, the second planetary carrier 412 is gap-set on the second speed output part 32 to avoid the rotational interference between the second planetary carrier 412 and the second speed output part 32. The rotating shafts of the second planetary gears 413 are fixedly installed on the second planetary carrier 412, all the second planetary gears 413 are located between the second sun gear tooth 323 and the second internal gear 4111, and all the second planetary gears 413 are engaged with the second sun gear tooth 323 and the second internal gear 4111. The rotating first planetary carrier 312 drives the second planetary gears 413 to revolve around the second sun gear tooth 323 while revolving around the sun in the second internal gear 4111 on the second gear carrier 411, and the second planetary gears 413 are decelerated by the second planetary gear set 41. The third speed output part 42 is installed on the second planetary carrier 412, that is, the third speed output part 42 outputs the third speed.

[0044] As an embodiment, the second sun gear tooth 323, the second internal gear 4111 and the external tooth of the second planetary gear 413 are all straight teeth, the transmission range is large, and the processing is easy and the cost is low. The number of the second planetary gears 413 can be 2-4, preferably, the number of the second planetary gears 413 is 3, the second planetary carrier 412 is triangularly supported, the transmission is more stable, and the space between the second sun gear tooth 323 and the second internal gear 4111 can be most effectively utilized, so that the most second planetary gears 413 can be installed in a certain space.

[0045] As shown in Figure 2 and 5 , in the embodiment, the first speed output part 21 comprises a first connector 211 installed on the end of the output shaft 13. In the structure, the end of the output shaft 13 passes through the first planetary carrier 312 and the second speed output part 32 in sequence and is in transmission connection with the first connector 211. The first speed output part 21 outputs the first speed, the first connector 211 is installed on the output shaft 13, the inner side wall of the first connector 211 is provided with internal teeth that can be in transmission connection with external stirring tool bits and the like, the assembly of the stirring tool bits and the like with external teeth is facilitated, and the external tool is driven to rotate at the first speed. The first speed is the fastest, and the first speed can be 10000 RPM, which can be used in devices such as soybean milk machines and wall crushing machines that require high-speed rotation.

[0046] As shown in Figure 2 and 5As shown, in the embodiment, the second speed output part 32 comprises a first connecting frame 321 and a second connector 322, the bottom of the first connecting frame 321 is mounted on the first planetary carrier 312 and rotates with the first planetary carrier 312, the outer peripheral wall of the middle part of the first connecting frame 321 is provided with a second sun gear tooth 323, and the second connector 322 is mounted on the upper end of the first connecting frame 321. The first connecting frame 321 is a shaft, and the middle part of the first connecting frame 321 is a hollow cavity, the output shaft 13 is arranged in the cavity of the first connecting frame 321, the second connector 322 has a receiving space, the end of the output shaft 13 is arranged in the receiving space of the second connector 322, the first connector 211 is connected with the end of the output shaft 13, and the first connector 211 is also arranged in the receiving space of the second connector 322, so that the first connector 211 and the second connector 322 are coaxial.

[0047] In the above structure, the second connector 322 can connect the tool bit of the external juicer, and drive the external tool bit to rotate at the second speed. The outer peripheral surface of the second connector 322 is provided with external teeth, which facilitates the assembly and installation of tools such as tool bits with internal teeth. The second speed can reach 1250 RPM, which can be used in small household appliances such as blenders or juicers, which can quickly crush food materials and are suitable for making fruit puree, milkshake and the like.

[0048] In the above structure, Figure 2 and 5 As shown, in the embodiment, the third speed output part 42 comprises a second connecting frame 421 and a third connector 422, the bottom of the second connecting frame 421 is mounted on the second planetary carrier 412, and the third connector 422 is mounted on the upper end of the second connecting frame 421. The second connecting frame 421 has a cavity, the first connecting frame 321 passes through the second connecting frame 421 and is connected with the second connector 322, the third connector 422 has a receiving space, the second connector 322 is located in the receiving space of the third connector 422, and finally the first connector 211, the second connector 322 and the third connector 422 are coaxially arranged.

[0049] In the above structure, the third connector 422 can connect external tools such as mixers, and the inner side wall of the third connector 422 is provided with connecting teeth, which facilitates the connection of tools such as mixers with external teeth. Drive the external device to rotate at the third speed. The third speed can be 193 RPM, which can be used in a chef machine and is suitable for kneading dough or beating eggs and the like.

[0050] As shown, Figure 1 and 2As shown, in the embodiment, the first connector 211, the second connector 322 and the third connector 422 are arranged in sequence from inside to outside with a gap coaxially sleeved, so that the first connector 211, the second connector 322 and the third connector 422 occupy the smallest space and realize high integration.

[0051] As shown in the embodiment, the first bearing 3221 is sleeved outside the second connector 322, the first bearing 3221 is installed on the second connecting frame 421, and the second connecting frame 421 cannot be driven when the second connector 322 rotates, but the second connecting frame 421 can support the second connector 322, so that the rotation of the second connector 322 is more stable and smooth. Figure 2 and 5 As shown in the embodiment, the first bearing 3221 is sleeved outside the second connector 322, the first bearing 3221 is installed on the second connecting frame 421, and the second connecting frame 421 cannot be driven when the second connector 322 rotates, but the second connecting frame 421 can support the second connector 322, so that the rotation of the second connector 322 is more stable and smooth. The second bearing 4211 is sleeved outside the second connecting frame 421, the second bearing 4211 is installed on the second gear frame 411, and the second gear frame 411 can support the second connecting frame 421, so that the rotation of the second connecting frame 421 is more stable and smooth. In this structure, the first bearing 3221 and the second bearing 4211 make the rotation of the second connector 322 and the second connecting frame 421 more smooth and stable, and since the second connecting frame 421 drives the third connector 422 to rotate, the rotation of the second connector 322 and the third connector 422 is more stable and smooth, thereby ensuring that the coaxial multi-speed transmission mechanism operates stably and smoothly and improving the user's experience.

[0052] The technical means disclosed in the utility model scheme is not only limited to the technical means disclosed in the above-mentioned embodiment, but also includes the technical scheme composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principle of the utility model, some improvements and refinements can be made, and these improvements and refinements are also considered as the protection scope of the utility model.

Claims

1. A coaxial multi-speed transmission structure, characterized by, The utility model relates to a power output mechanism (1); First speed output mechanism (2), first speed output mechanism (2) includes first speed output part (21), and first speed output part (21) is transmissionally connected with the output shaft (13) of power output mechanism (1); Second speed output mechanism (3), second speed output mechanism (3) includes first planetary gear set (31) and second speed output part (32), first planetary gear set (31) is transmissionally connected with the output shaft (13), and second speed output part (32) is installed on first planetary gear set (31); Third speed output mechanism (4), third speed output mechanism (4) includes second planetary gear set (41) and third speed output part (42), second planetary gear set (41) is transmissionally connected with second speed output part (32), and third speed output part (42) is installed on second planetary gear set (41); First speed output part (21), second speed output part (32), third speed output part (42) and output shaft (13) are coaxially arranged. Power output mechanism (1) includes motor (11) and end cover (12), the output end of motor (11) is transmissionally connected with output shaft (13), end cover (12) is installed on motor (11), and output shaft (13) passes through end cover (12) and is transmissionally connected with first speed output part (21).

2. The concentric multi-speed transmission structure according to claim 1, characterized in that, First planetary gear set (31) includes first gear carrier (311), first planet carrier (312) and a plurality of first planetary gears (313), first gear carrier (311) is installed on the end cover (12) of power output mechanism (1), the inner side wall of first gear carrier (311) is provided with first internal gear (3111), the first sun gear tooth (131) is arranged on the output shaft (13), first planet carrier (312) is gaply sleeved on the outside of output shaft (13), a plurality of first planetary gears (313) are installed on first planet carrier (312) and drive it to rotate, a plurality of first planetary gears (313) are located between first sun gear tooth (131) and first internal gear (3111), each first planetary gear (313) is respectively engaged with first sun gear tooth (131) and first internal gear (3111), and second speed output part (32) is installed on first planet carrier (312) and rotates with it.

3. The coaxial multi-speed transmission structure according to claim 1 or 2, characterized in that, ​ 4. The coaxial multi-speed transmission structure according to claim 3, characterized in that, The second planetary gear set (41) comprises a second gear carrier (411), a second planet carrier (412) and a plurality of second planetary gears (413), the second gear carrier (411) is mounted on the end cover (12) of the power output mechanism (1), the inner side wall of the second gear carrier (411) is provided with a second inner gear (4111), the second speed output portion (32) is provided with a second sun gear tooth (323), the second planet carrier (412) is gap-set outside the second speed output portion (32), a plurality of second planetary gears (413) are mounted on the second planet carrier (412) and drive it to rotate, a plurality of second planet carriers (412) are located between the second sun gear tooth (323) and the second inner gear (4111), each second planetary gear (413) is respectively engaged with the second sun gear tooth (323) and the second inner gear (4111), and the third speed output portion (42) is mounted on the second planet carrier (412) and rotates with it.

5. The coaxial multi-speed transmission structure according to claim 4, characterized in that, The first speed output portion (21) comprises a first connector (211), and the first connector (211) is mounted on the end of the output shaft (13).

6. The concentric multi-speed transmission structure according to claim 5, wherein The second speed output portion (32) comprises a first connecting frame (321) and a second connector (322), the lower end of the first connecting frame (321) is mounted on the first planet carrier (312) and rotates with it, the outer circumferential surface of the first connecting frame (321) is provided with the second sun gear tooth (323), and the second connector (322) is mounted on the upper end of the first connecting frame (321).

7. The concentric multi-speed transmission structure according to claim 6, wherein The third speed output portion (42) comprises a second connecting frame (421) and a third connector (422), the lower end of the second connecting frame (421) is mounted on the second planet carrier (412), and the third connector (422) is mounted on the upper end of the second connecting frame (421).

8. The concentric multi-speed transmission structure according to claim 7, wherein The first connector (211), the second connector (322) and the third connector (422) are sequentially gap-set from inside to outside, and the first connector (211), the second connector (322), the third connector (422) and the output shaft (13) are coaxially arranged.

9. The concentric multi-speed transmission structure according to claim 7, wherein The second connector (322) is externally sleeved with a first bearing (3221), and the first bearing (3221) is mounted on the second connecting frame (421).

10. The concentric multi-speed transmission structure according to claim 7 or 9, characterized by The second connecting frame (421) is externally sleeved with a second bearing (4211), and the second bearing (4211) is mounted on the second gear carrier (411).

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