CN215883967U

CN215883967U - Chain wheel three-stage speed change device of middle-placed motor and middle-placed motor thereof

Info

Publication number: CN215883967U
Application number: CN202121659234.9U
Authority: CN
Inventors: 严振华
Original assignee: Tianjin Disikebo Technology Development Co ltd
Current assignee: Tianjin Disikebo Technology Development Co ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2022-02-22
Anticipated expiration: 2031-07-21

Abstract

The utility model relates to a chain wheel three-stage speed change device of a middle-mounted motor, wherein a speed change output mechanism comprises an input sun gear, a duplex planet gear pinion, a planet gear shaft, a left planet carrier, a right planet carrier, a gear ring, an output sun gear and a shaft sleeve, the input sun gear is meshed with the duplex planet gear pinion, the duplex planet gear pinion is meshed with the gear ring, the duplex planet gear large gear is meshed with the output sun gear, the output sun gear is supported on the shaft sleeve, the outer ring of the output sun gear is supported on the planet carrier on the right side, the inner circle of the input sun gear is provided with a spline groove, and the left side and the right side of the spline groove of the input sun gear are respectively spliced with a torque sensor and spline teeth of the shaft sleeve to form a high-speed, medium-speed and low-speed output mechanism and are respectively connected with a speed selection mechanism. Has the advantages that: the utility model is further improved on the basis of the original design structure, and the three gears including high, middle and low gears are added, so that the overall miniaturization and light weight of the middle motor can be realized, and a wider speed change range can be provided for riders.

Description

Chain wheel three-stage speed change device of middle-placed motor and middle-placed motor thereof

Technical Field

The utility model belongs to the technical field of a middle-arranged motor of a bicycle, and particularly relates to a chain wheel three-stage speed changing device of the middle-arranged motor and the middle-arranged motor thereof.

Background

At present, a motor arranged in a booster bicycle mainly mounted on a high-end vehicle type can change speed on a transmission path from a motor rotor to a chain wheel basically, and the speed cannot be changed on a transmission path from a middle shaft to the chain wheel, namely a power transmission path of manpower treading, so that the speed change range is unchanged for a rider. Technical personnel of production enterprises who put the motor in all are trampling power transmission route output multistage variable speed through the manpower in research and development, and make its more miniaturized, lightweight put the motor in to satisfy the market demand. The applicant discloses a chain wheel speed changing device of a built-in motor and a built-in motor thereof with application number 202121375473.1, and the main structure of the chain wheel speed changing device is as follows: the speed-increasing mechanism comprises a middle shaft, a speed-increasing mechanism, a speed selection mechanism and a pedal torque detection mechanism, wherein the speed-increasing mechanism forms an output structure coaxial with the middle shaft through a high-speed sun gear supported on the middle shaft and a low-speed sun gear supported on the high-speed sun gear, pedal power with two speeds is selected and output to a chain wheel through the speed selection mechanism, and the speed-increasing mechanism comprises a planetary gear train speed-increasing output mechanism and a fixed gear train speed-increasing output mechanism through a transition wheel; the speed selection mechanism comprises a radial speed selection mechanism and an axial speed selection mechanism. The applicant further applies for a chain wheel speed changing device of a middle-placed motor and the middle-placed motor thereof by a patent document with the application number of 202110791588.7, and the chain wheel speed changing device comprises a middle shaft, a speed changing output mechanism and a speed selection mechanism, wherein the speed changing output mechanism is coaxial with the middle shaft, the speed changing output mechanism comprises a left side planet carrier, a right side planet carrier, a planet wheel shaft, a planet wheel, a gear ring and a sun wheel, the planet wheel is in sliding connection with the planet wheel shaft, the planet wheel is meshed with the gear ring, the planet wheel is meshed with the sun wheel, the sun wheel is supported on the middle shaft through a bearing, the outer ring of the sun wheel is supported on the right side planet carrier through a bearing, the right side planet carrier is provided with a right side planet carrier ratchet, the sun wheel is provided with a sun wheel ratchet, a planetary gear train speed increasing output mechanism for directly outputting the sun wheel at a high speed and the planet carrier is formed, and the speed changing output mechanism is connected with the speed selection mechanism. The applicant continuously develops the chain wheel speed changing device of the central motor to meet the upgrading requirement of the market.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the technology and provides the chain wheel three-stage speed change device of the middle-mounted motor and the middle-mounted motor thereof.

In order to achieve the purpose, the utility model adopts the following technical scheme: a chain wheel three-stage speed change device of a middle motor comprises a middle shaft, a speed change output mechanism and a speed selection mechanism, wherein the speed change output mechanism and the speed selection mechanism are coaxial with the middle shaft, and the speed change device is characterized in that: the variable speed output mechanism comprises an input sun gear, a big pinion and a pinion of a duplex planet gear, a planet gear shaft, a left planet carrier, a right planet carrier, a gear ring, an output sun gear and a shaft sleeve, the planet wheel shaft is supported on the left and right planet carriers, the duplex planet wheel big and small gears are connected with the planet wheel shaft in a sliding way, the input sun gear is meshed with a duplex planet gear pinion, the duplex planet gear pinion is meshed with a gear ring fixedly connected on the shell, a duplex planet gear bull gear is meshed with the output sun gear, the output sun gear is supported on the shaft sleeve through a sun gear supporting bearing, the outer ring of the output sun gear is supported on a right planet carrier through a right planet carrier supporting bearing, the left planet carrier and the right planet carrier are fixed through bolts to form an integral structure, and constitute planetary gear train high-speed, low-speed output mechanism of high-speed output of sun gear and planetary carrier output; the inner circle of the input sun wheel is provided with a spline groove, the spline groove on the left side of the input sun wheel is inserted with the spline tooth of the torque sensor, the spline groove on the right side of the input sun wheel is inserted with the spline tooth of the shaft sleeve, and the torque sensor, the input sun wheel and the shaft sleeve are inserted to form an integral structure and are in clearance fit with the middle shaft to form a shaft sleeve medium-speed output mechanism; the planetary gear train high-speed and low-speed output mechanism and the shaft sleeve medium-speed output mechanism are respectively connected with the speed selection mechanism.

A chain wheel three-stage speed change device of a middle motor comprises a middle shaft, a speed change output mechanism and a speed selection mechanism, wherein the speed change output mechanism and the speed selection mechanism are coaxial with the middle shaft, and the speed change device is characterized in that: the variable speed output mechanism comprises a medium speed output sun gear, a duplex planet gear large and small gear, a planet gear shaft, a left planet carrier, a right planet carrier, a gear ring, an output sun gear and a shaft sleeve, wherein the medium speed output sun gear is supported on a middle shaft through a medium speed output sun gear supporting bearing, a spline groove is formed in the inner circle of the medium speed output sun gear and is in plug-connection with spline teeth of the shaft sleeve, a spline groove is formed in the inner circle of the left planet carrier and is in plug-connection with the spline teeth of a torque sensor, the planet gear shaft is supported on the left and right planet carriers, the duplex planet gear large and small gear is in sliding connection with the planet gear shaft, the medium speed output sun gear is meshed with the duplex planet gear small gear, the duplex planet gear small gear is meshed with the gear ring fixedly connected on the shell, the duplex planet gear large gear is meshed with the output sun gear, and the output sun gear is supported on the shaft sleeve through a sun gear supporting bearing, the output sun gear is a medium and high speed output part respectively, so that a high, medium and low three-gear speed output mechanism of the sun gear speed increasing output and the planet carrier low speed synchronous output is formed, and the high, medium and low three-gear speed output mechanism is respectively connected with the speed selection mechanism.

The speed selection mechanism comprises an output sleeve and a gear control ring, a low-speed selection jack is arranged on the outer circle of the output sleeve, a high-speed selection jack is arranged on the inner circle of the output sleeve, a jack reset spring is clamped on the back surface of the jack, the low-speed selection jack is in contact with a right side planet carrier ratchet arranged on the circumference of the inner circle of a right side planet carrier, the high-speed selection jack is in contact with an output sun gear ratchet, a middle-speed selection jack groove is formed in the inner circle of a motor input gear, a middle-speed selection jack is arranged in the middle of the selection jack groove, the middle-speed selection jack is in contact with a shaft sleeve ratchet on a shaft sleeve, a positioning lug is arranged on the end surface of the output sleeve, a screw through hole is formed in the positioning lug, high-speed selection jack avoiding openings and middle-speed selection jack avoiding openings are alternately arranged on the gear control ring corresponding to the high-speed selection jack and the middle-speed selection jack, and a middle-speed friction ring is fixedly connected to the gear control ring, the middle-speed gear friction ring is connected with a high-speed gear friction ring in a sliding mode, a positioning lug is arranged at the position, corresponding to the end face of the output sleeve, of the bottom of the middle-speed gear friction ring, and is provided with a positioning lug avoiding opening, a high-speed gear friction ring protruding position is arranged at the position, corresponding to the high-speed gear friction ring protruding position, of the outer circumference of the middle-speed gear friction ring, the output sleeve is fixed with the motor input gear through a screw penetrating through the positioning lug, the gear control ring is arranged between the output sleeve and the motor input gear, a gear control ring reset spring is arranged on the positioning lug avoiding opening of the middle-speed gear friction ring, the middle-speed gear friction ring and the high-speed gear friction ring are respectively subjected to corner displacement through a damping corner mechanism, and a ratchet type middle gear and high gear speed selection mechanism is formed.

The damping corner mechanism comprises an intermediate-speed gear control spring, a high-speed gear control spring and a gear control motor, wherein the intermediate-speed gear control spring and the high-speed gear control spring are in an open shape, the high-speed gear control spring is clamped on the excircle of a high-speed gear friction ring, the intermediate-speed gear control spring is clamped on the excircle of a medium-speed gear friction ring, the open ends of the intermediate-speed gear control spring and the high-speed gear control spring are respectively in contact with a diamond-shaped head of the gear control motor, the closed ends of the intermediate-speed gear control spring and the high-speed gear control spring are in pin joint with a main shell of the middle-placed motor through positioning pins, and friction plates for damping the excircle of the intermediate-speed gear friction ring and the high-speed gear friction ring are arranged on the inner side of the intermediate-speed gear control spring and the high-speed gear control spring.

The gear control motor is characterized in that the number of the gear control motor diamond heads is two, the gear control motor diamond heads are in key joint with the output shaft of the gear control motor at an angle of 45 degrees, so that the gear control ring is divided into two sections of rotating angles, and high, medium and low speed selection is realized.

A middle motor provided with a chain wheel three-stage speed change device.

Has the advantages that: compared with the prior art, the chain wheel speed changing device of the middle motor is further improved on the basis of the original design structure, and is increased to three gears, namely a high gear, a middle gear and a low gear, so that the whole miniaturization and light weight of the middle motor can be realized, and a wider speed changing range and more comfortable riding experience can be provided for a rider.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the present invention;

FIG. 2 is a schematic perspective view of FIG. 1;

FIG. 3 is an exploded view of FIG. 1;

FIG. 4 is a schematic view of the torque sensor coupled to the sleeve;

FIG. 5 is a partial schematic view of the speed selection mechanism of FIG. 3;

FIG. 6 is a partially exploded view of the speed selection mechanism of FIG. 5;

FIG. 7 is a partial cross-sectional view of the speed selection mechanism;

FIG. 8 is a cross-sectional view of the speed selection mechanism;

FIG. 9 is a perspective view of the high gear operating condition;

FIG. 10 is a perspective view of the intermediate gear operating condition;

FIG. 11 is a schematic illustration of the partial positional relationship of the intermediate gear operating condition;

FIG. 12 is a schematic illustration of the low range operating condition;

FIG. 13 is a schematic illustration of the partial positional relationship of the low range operating condition;

FIG. 14 is a schematic view of the transmission principle in the high gear of embodiment 1;

FIG. 15 is a schematic view of the transmission principle in the middle speed gear of embodiment 1;

FIG. 16 is a schematic view of the transmission principle in a low-speed gear stage of embodiment 1;

FIG. 17 is a schematic structural view of embodiment 2 of the present invention;

FIG. 18 is a schematic view of the transmission principle of embodiment 2;

fig. 19 is a schematic structural view of a center-mounted motor adopting the structure of embodiment 1;

fig. 20 is an external view schematically showing a mid-motor adopting the structure of embodiment 1.

In the figure: 1. a middle shaft, 2, a torque sensor, 2-1, spline teeth, 3, an input sun gear, 3-1, spline grooves, 4, a duplex planet gear pinion, 4-1, a duplex planet gear bull gear, 5, a planet gear shaft, 6, a left planet carrier, 6-1, a right planet carrier, 6-2, a right planet carrier ratchet, 7, a gear ring, 8, an output sun gear, 8-1, an output sun gear ratchet, 9, a sun gear support bearing, 10, a right planet carrier support bearing, 11, a left planet carrier support bearing, 12, a shaft sleeve, 12-1, a shaft sleeve ratchet, 12-2, spline teeth, 13, an output sleeve, 13-1, a positioning lug, 14, a gear control ring, 14-1, a high-speed selection jack avoiding opening, 14-2, a medium-speed selection jack avoiding opening, 15, a medium-speed friction ring, 15-1, a positioning lug avoiding opening, 15-2, a high-speed gear friction ring protrusion avoiding opening, 16, a high-speed gear friction ring, 16-1, a high-speed gear friction ring protrusion, 17, a gear control ring return spring, 18, a medium-speed gear friction plate, 19, a high-speed gear friction plate, 20, a motor input gear, 20-1, a motor input gear boss, 20-2, a motor input gear groove, 20-3, a medium-speed selection jack groove, 20-4, a high-speed gear friction ring protrusion avoiding groove, 21, a motor input gear inner side support bearing, 22, a motor input gear outer side support bearing, 23, a medium-shaft support bearing, 24, a low-speed selection jack, 25, a medium-speed selection jack, 26, a high-speed selection jack, 27, a jack return spring, 28, a medium-speed gear control spring, 29, a high-speed gear control spring, 30. the gear control mechanism comprises a positioning pin 31, a gear control motor 31-1, a gear control motor diamond head 32, an output sleeve fixing screw 33, a chain wheel 34, a bolt 35, a shell 36, a medium-speed output sun gear 37, a medium-speed output sun gear supporting bearing 38 and a shaft sleeve supporting bearing.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Unless defined otherwise, 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 belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

In various embodiments of the present invention, for convenience in description and not in limitation, the term "coupled" as used in the specification and claims of the present application is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Example 1

With specific reference to the accompanying drawings 1-16, the embodiment provides a chain wheel three-stage speed change device of a mid-motor, which comprises a middle shaft 1, a speed change output mechanism and a speed selection mechanism, wherein the speed change output mechanism is coaxial with the middle shaft, the speed change output mechanism comprises an input sun gear 3, a duplex planet gear big gear, a pinion gear 4-1, 4, a planet gear shaft 5, a left planet carrier 6, a right planet carrier 6-1, a gear ring 7, an output sun gear 8 and a shaft sleeve 12, the planet gear shafts are supported on the left and right planet carriers, the duplex planet gear big gear and the pinion gear are in sliding connection with the planet gear shafts, the input sun gear is engaged with the duplex planet gear pinion gear, the duplex planet gear pinion gear is engaged with the gear ring fixedly connected on a shell 35, the duplex planet gear big gear is engaged with the output sun gear, the output sun gear is supported on the shaft sleeve through a sun gear supporting bearing 9, the outer ring of the output sun gear is supported on a right planet carrier through a right planet carrier supporting bearing 10, the left planet carrier is supported on the shell through a left planet carrier supporting bearing 11, the left planet carrier and the right planet carrier are fixed into an integral structure through bolts 34, and a planetary gear train high-speed and low-speed output mechanism for high-speed output of the sun gear and output of the planet carrier is formed; the inner circle of the input sun gear is provided with spline grooves 3-1, the left spline groove of the input sun gear is spliced with spline teeth 2-1 of the torque sensor, the right spline groove of the input sun gear is spliced with spline teeth 12-2 of the shaft sleeve, and the torque sensor, the input sun gear and the shaft sleeve are spliced to form an integral structure and are in clearance fit with the middle shaft to form a shaft sleeve medium-speed output mechanism; the planetary gear train high-speed and low-speed output mechanism and the shaft sleeve medium-speed output mechanism are respectively connected with the speed selection mechanism.

Example 2

The best technical scheme is that the chain wheel three-stage speed change device of the middle motor comprises a middle shaft 1, a speed change output mechanism and a speed selection mechanism, wherein the speed change output mechanism is coaxial with the middle shaft, the speed change output mechanism comprises a medium-speed output sun gear 36, a double planet gear big gear, small gears 4-1 and 4, a planet gear shaft 5, a left planet carrier 6, a right planet carrier 6-1, a gear ring 7, an output sun gear 8 and a shaft sleeve 12, the medium-speed output sun gear is supported on the middle shaft 1 through a medium-speed output sun gear supporting bearing 37, the inner circle of the medium-speed output sun gear is provided with spline grooves, the spline grooves are spliced with spline teeth of the shaft sleeve, the inner circle of the left planet carrier is provided with spline grooves, the spline grooves are spliced with spline teeth of a torque sensor 2, the planet gear shaft is supported on the left and right planet carriers, the double planet gear big gear and the small gear are in sliding connection with the planet gear shaft, the sun gear 36 is meshed with the double planet gear pinion 4, the double planet gear pinion is meshed with a gear ring fixedly connected to the shell, a large gear 4-1 of the double planet gear is meshed with the output sun gear 8, the output sun gear is supported on a shaft sleeve through a sun gear supporting bearing 9, the shaft sleeve is supported on a middle shaft through a shaft sleeve supporting bearing 38, the outer ring of the output sun gear is supported on a right planet carrier through a right planet carrier supporting bearing 10, the left planet carrier and the right planet carrier are fixed through bolts 34 to form an integral structure, the planet carrier is an input part, the two output sun gears are respectively a medium-speed output part and a high-speed output part, a high-speed output mechanism, a medium-speed output mechanism and a low-speed output mechanism of the sun gear are formed, and the high-speed output mechanism, the medium-speed output mechanism and the low-speed output mechanism are respectively connected with a speed selection mechanism.

The specific structure and three speed output states are described in detail below

As shown in fig. 1 and 14, a 3K transmission structure is adopted, one sun gear is an input member, the other sun gear is a high-speed output member, and the planet carrier is a low-speed output member. The pedal power of the middle shaft drives the input sun gear, the planet gear and the planet carrier to rotate through the torque sensor, the output sun gear parallel to the input sun gear is output at a high speed, and the transmission ratio is less than 1; the planet carrier outputs at a low speed, and the transmission ratio is greater than 1; the shaft sleeve keyed with the input sun gear is synchronously output with the middle shaft, and the transmission ratio is equal to 1. The pedal power is output at three speeds, namely high speed, medium speed and low speed, the output of the sun gear is high-speed-increasing output, the shaft sleeve is medium-speed synchronous output, and the planet carrier is low-speed-reducing output. The specific parameters are shown in table 1:

TABLE 1

Low gear reduction ratio:

in a low gear, the middle shaft rotates for one circle, and the chain wheel rotates for 0.38 circle, namely, the speed is reduced and output is realized;

high-gear reduction ratio:

when the gear is in a high gear, the middle shaft rotates for one circle, and the chain wheel rotates for 1.37 circles, namely, the output is accelerated;

in the middle gear, the middle shaft rotates for one circle, and the chain wheel also rotates for 1 circle, namely synchronous output.

When the middle shaft of the embodiment 1 rotates for one circle, the relative rotation circles of the high-gear chain wheel, the middle-gear chain wheel and the low-gear chain wheel are 1.37 circle, 1 circle and 0.38 circle respectively.

Example 2

The embodiment is the best chain wheel speed changing device of the middle-mounted motor.

As shown in fig. 17 and 18, a 3K transmission structure is adopted, the planet carrier is an input member, the middle-speed output sun gear is one of middle-speed output members, the other output sun gear is a high-speed output member, and the planet carrier is also used as a low-speed output member. The pedal power of the middle shaft drives the planet carrier, the planet wheel and the sun wheel to rotate through the torque sensor, the two sun wheels output middle and high speed respectively, and the transmission ratio is less than 1; the planet carrier outputs at low speed, and the transmission ratio is equal to 1. The pedal power is output at three speeds of high, medium and low, the sun gear is output at an increased speed, and the planet carrier is output at a low speed synchronously. The specific parameters are shown in table 3:

TABLE 3

When the output member is a medium-speed sun gear, the medium-speed gear reduction ratio is as follows:

when the gear is in a middle gear, the middle shaft rotates for one circle, and the chain wheel rotates for 2.6 circles, namely, the output is accelerated;

when the output member is a high-speed sun gear, the high-speed gear reduction ratio is as follows:

when the gear is in a high gear, the middle shaft rotates for one circle, and the chain wheel rotates for 3.6 circles, namely, the output is accelerated;

and in a low gear, the middle shaft rotates for one circle, and the chain wheel also rotates for 1 circle, namely synchronous output.

In the embodiment 2, when the middle shaft rotates for one circle, the relative rotation circles of the high-gear chain wheel, the middle-gear chain wheel and the low-gear chain wheel are respectively 3.6 circles, 2.6 circles and 1 circle.

Referring to the attached drawings 5-13 in detail, the speed selection mechanism adopts a ratchet mechanism, the speed selection mechanism comprises an output sleeve 13 and a gear control ring 14, a low-speed selection jack 24 is arranged on the outer circle of the output sleeve, a high-speed selection jack 26 is arranged on the inner circle of the output sleeve, a jack reset spring 27 is clamped on the back face of the jack, the low-speed selection jack is in contact with a right-side planet carrier ratchet 6-2 arranged on the circumference of the inner circle of a right-side planet carrier, the high-speed selection jack 26 is in contact with an output sun gear ratchet 8-1, a medium-speed selection jack groove is arranged on the inner circle of an input gear of a motor, a medium-speed selection jack 25 is arranged in the medium-speed selection jack groove, the medium-speed selection jack is in contact with a shaft sleeve ratchet 12-1 on a shaft sleeve, a positioning lug 13-1 is arranged on the end face of the output sleeve, a screw through hole is arranged on the positioning lug, and high-speed selection jack avoiding openings 14 are arranged on the gear control ring in a staggered mode corresponding to the positions of the high-speed selection jack and the medium-speed selection jack A middle gear control ring 15 is fixedly connected to the gear control ring, and a middle gear selection jack avoiding opening 14-2 is arranged on the gear control ring, the middle gear friction ring is connected with a high gear friction ring 16 in a sliding way, a positioning lug avoiding opening 15-1 is arranged at the position, corresponding to the positioning lug on the end surface of the output sleeve, on the bottom of the middle gear friction ring, a high-speed gear friction ring protrusion avoiding opening 15-2 is arranged on the outer circumference corresponding to the high-speed gear friction ring protrusion, the output sleeve is fixed with the motor input gear 20 through a bolt 32 penetrated by a positioning lug, the gear control ring is arranged between the output sleeve and the motor input gear, a gear control ring return spring 17 is arranged on a positioning lug avoiding opening of the middle gear friction ring, the middle gear friction ring and the high gear friction ring are respectively subjected to corner displacement through a damping corner mechanism to form a ratchet wheel type middle gear and high gear speed selection mechanism.

The preferred scheme of the utility model is that the damping corner mechanism comprises a medium-speed gear control spring 28, a high-speed gear control spring 29 and a gear control motor 31, wherein the medium-speed gear control spring and the high-speed gear control spring are in an open shape, the high-speed gear control spring is clamped on the excircle of a high-speed gear friction ring, the medium-speed gear control spring is clamped on the excircle of a medium-speed gear friction ring, the open ends of the medium-speed gear control spring and the high-speed gear control spring are respectively contacted with a diamond-shaped head 31-1 of the gear control motor, the closed ends of the medium-speed gear control spring and the high-speed gear control spring are in pin joint with a main shell of the medium-mounted motor through a positioning pin 30, and

friction plates

18 and 19 for damping the excircle of the medium-speed gear friction ring and the high-speed gear friction ring are arranged on the inner sides of the medium-speed gear control spring and the high-speed gear control spring. The gear control motor is characterized in that the number of the gear control motor diamond heads is two, the gear control motor diamond heads are in key joint with the output shaft of the gear control motor at an angle of 45 degrees, so that the gear control ring is divided into two sections of rotating angles, and high, medium and low speed selection is realized.

The damping corner mechanism adopts a band-type brake friction sheet type or caliper friction sheet type structure. The adoption of the brake friction plate type in the embodiment is disclosed in the patent documents (application numbers: 202121375473.1, 202110685353.X) of the prior application, and is not described in detail herein. The damping corner mechanism can adopt various forms of structures, and only the gear control ring of the ratchet wheel type speed selection mechanism is subjected to resistance so as to generate corner displacement. The damping corner mechanism is characterized in that two control springs, namely a middle-speed gear control spring 28 and a high-speed gear control spring 29 are adopted, and the opening or closing of the two control springs is controlled through a diamond-shaped head of a gear control motor, so that a gear control ring is divided into two sections of rotating angles, and the selection of high, middle and low speeds is realized. The speed selection switching action of the speed selection mechanism can be driven by a micro motor or manually driven by a wire pulling mode.

Working principle and working process of speed selection mechanism

1. High-gear speed output: as shown in fig. 9, when the gear control motor diamond head of the damping corner mechanism supports both the middle and high gear control springs (at this time, the diamond head is defined as 0 °), the middle and high gear friction plates are separated from the middle and high gear friction rings, respectively, and when the gear control ring has no corner displacement, the gear control ring rotates clockwise to the position shown in fig. 9 under the action of the gear control ring return spring, and at this time, the middle and high speed selection jacks do not contact with the gear control ring, and both pass through the jack avoiding opening and are detected out. The high, medium and low speed selecting jacks are respectively contacted with the output sun gear ratchet, the shaft sleeve ratchet and the right side planet carrier ratchet under the action of the jack return spring. When the axis clockwise rotation, output sun gear, axle sleeve, planet carrier also clockwise rotation, the rotational speed is high to low being in proper order: output sun gear, axle sleeve, planet carrier. Because the rotating speed of the output sun wheel is highest, the output sun wheel ratchet drives the output sleeve to synchronously rotate through the high-speed selection jack, the rotating speed of the output sleeve exceeds the shaft sleeve and the planet carrier at the moment, and the middle-speed and low-speed selection jacks respectively slip with the shaft sleeve ratchet and the right planet carrier ratchet. The output sleeve drives the motor input gear and the toothed disc to rotate in a high-grade state;

2. mid-range speed output: as shown in fig. 10 and 11, after the gear control motor diamond head of the damping corner mechanism rotates clockwise by 45 degrees, the high-speed gear control spring falls down, and the low-speed gear control spring still keeps the spread state. Because the high-speed gear control spring falls down, the high-speed gear friction plate is contacted with the high-speed gear friction ring to generate damping, the high-speed gear friction ring generates rotary angle displacement, the size of the rotary angle displacement is determined by the width of a protrusion avoiding groove of the high-speed gear friction ring on a boss of an input gear of the motor, namely, the high-speed gear friction ring and the gear control ring in the high-speed gear friction ring rotate to the positions shown in the figure 11, at the moment, the middle-speed selection jack is not contacted with the gear control ring yet, penetrates through a jack avoiding opening to be detected, the high-speed selection jack is jacked up by gear control, and the high-speed selection jack is not detected. Only the middle-speed and low-speed selective jacks are respectively contacted with the shaft sleeve ratchet and the right planet carrier ratchet under the action of the jack return spring. When the axis clockwise rotation, output sun gear, axle sleeve, planet carrier also clockwise rotation, the rotational speed is high to low being in proper order: output sun gear, axle sleeve, planet carrier. The high-speed selection jack is jacked up and is not in contact with the output sun gear ratchet, the output sun gear idles, the rotating speed of the shaft sleeve is higher than that of the planet carrier, the shaft sleeve ratchet drives the output sleeve to synchronously rotate through the medium-speed selection jack, the rotating speed of the output sleeve exceeds that of the planet carrier at the moment, and the low-speed selection jack and the right planet carrier ratchet slip. The output sleeve drives the motor input gear and the toothed disc to rotate in a middle gear;

3. low gear speed output: as shown in fig. 12 and fig. 13, after the gear control motor diamond head of the damping rotation angle mechanism rotates clockwise by 45 degrees (the diamond head is defined as 90 degrees), the middle gear control spring also falls. The middle gear friction plate is contacted with the middle gear friction ring to generate damping, the middle gear friction ring further generates corner displacement, the size of the corner displacement is determined by the width of a protrusion avoiding opening of the high gear friction ring, namely, the middle gear friction ring drives the gear control ring to rotate to the position shown in figure 13, at the moment, the middle speed selection jack is also jacked up by the gear control ring, and the middle speed selection jack is not detected. Only the low-speed selection jack is contacted with the ratchet of the planet carrier on the right side under the action of the jack return spring. When the axis clockwise rotation, output sun gear, axle sleeve, planet carrier also clockwise rotation, the rotational speed is high to low being in proper order: output sun gear, axle sleeve, planet carrier. Because the high-speed and medium-speed selecting jacks are jacked up and are not in contact with the output sun gear ratchet and the shaft sleeve ratchet, the output sun gear and the shaft sleeve idle, and the planet carrier ratchet drives the output sleeve to synchronously rotate through the low-speed selecting jack. The output sleeve drives the motor input gear and the toothed disc to rotate in a low gear.

Table 2 shows the different working states of the key parts of the speed selection mechanism in the high, middle and low gears (each column in the table shows the working state from top to bottom)

TABLE 2

Referring to fig. 1 and 3 in detail, the present invention employs a common torque sensor, and the structure of the torque sensor belongs to a conventional structure and is not described again.

Example 3

Referring to fig. 19 and 20, a mid-motor with a chain wheel speed variator is shown.

As shown in fig. 19, in the middle-mounted motor of the chain wheel transmission according to embodiment 1, the motor power passes through the motor tooth head → the first-stage reduction gear wheel → the motor-side one-way clutch → the second-stage reduction pinion → the motor input gear → the chain wheel.

When the bicycle is ridden with the assistance, the bicycle is driven by manpower and motor power together, namely, two paths of power transmission paths of the manpower and the motor power exist. The power transmission path of the motor is as follows: rotor → motor tooth head → first-stage reduction big gear → motor side one-way clutch → second-stage reduction small gear → motor input gear → chain wheel.

Manpower power transmission path:

in the high gear: middle shaft → torque sensor → input sun gear → planet wheel → output sun gear → output sleeve → motor input gear → chain wheel.

In the middle gear stage: middle shaft → torque sensor → input sun gear → shaft sleeve → output sleeve → motor input gear → chain wheel 33.

At the time of low gear: middle shaft → torque sensor → input sun gear → planet wheel → planet carrier → output sleeve → motor input gear → chain wheel.

When the bicycle is ridden by pure manpower, the motor input gear drives the second-stage reduction pinion to rotate, and the motor rotor and the first-stage reduction gearwheel are in a static state, so that the second-stage reduction pinion and the motor-side one-way clutch slip, the motor rotor cannot be driven to rotate, and the motor rotor cannot be interfered with each other.

When the bicycle is ridden by pure electric power, the middle shaft, the planet carrier, the planet wheel, the sun wheel and the shaft sleeve are in a static state, the input gear of the motor and the output sleeve rotate synchronously, the high-speed jack, the middle-speed jack and the low-speed jack which rotate synchronously with the output sleeve exceed the corresponding ratchets, the ratchets slip, and the main shaft cannot be driven to rotate and do not interfere with each other.

When the reverse is driven by manpower, the chain wheel becomes a driving part, and although the speed change mechanism has three speed transmission ratios, the selection states of three speed transmission paths of the speed selection mechanism can not generate the problem of mutual interference. The specific principle is as follows: if the speed selection mechanism is in a high-speed gear, the high-speed, medium-speed and low-speed selection jacks are respectively meshed with the sun gear ratchet, the shaft sleeve ratchet and the right side planet carrier ratchet, and because the two sun gears are in accelerated output and the rotating speed is higher than that of the planet carrier, the low-speed selection jacks drive the planet carrier to synchronously rotate, and the output sun gear ratchet and the shaft sleeve ratchet slip at the moment, a transmission path is still kept; if the speed selection mechanism is in the middle gear or the low gear, the input gear of the motor rotates reversely at the moment, and drives the friction ring and the gear control ring 14 to rotate reversely, so that the gear control ring is forced to overcome the friction force to reset, and the speed selection mechanism is in the high-speed gear state, so that a transmission path is still maintained, and the three speed transmission paths can not interfere with each other.

The speed change mechanism of the utility model is mainly characterized in that: the speed change mechanism forms an output structure coaxial with the middle shaft through an input sun gear supported on the middle shaft, a shaft sleeve and an output sun gear supported on the shaft sleeve, and then pedal power with three speeds is selectively output to the chain wheel through the speed selection mechanism, and the three speeds can be switched.

The utility model participates in the operation of the middle motor, and the function analysis of the utility model is as follows:

after the bicycle takes part in the work of the middle-mounted motor, the power of the pedal can be switched among high speed, medium speed and low speed according to the riding requirement, so that the bicycle has a wider speed regulation range, stronger adaptability and more comfortable riding.

The above detailed description of the chain wheel three-stage transmission with the built-in motor and the built-in motor thereof with reference to the embodiments is illustrative and not restrictive, and several embodiments can be enumerated according to the limited scope, so that changes and modifications without departing from the general concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A chain wheel three-stage speed change device of a middle motor comprises a middle shaft, a speed change output mechanism and a speed selection mechanism, wherein the speed change output mechanism and the speed selection mechanism are coaxial with the middle shaft, and the speed change device is characterized in that: the variable speed output mechanism comprises an input sun gear, a big pinion and a pinion of a duplex planet gear, a planet gear shaft, a left planet carrier, a right planet carrier, a gear ring, an output sun gear and a shaft sleeve, the planet wheel shaft is supported on the left and right planet carriers, the duplex planet wheel big and small gears are connected with the planet wheel shaft in a sliding way, the input sun gear is meshed with a duplex planet gear pinion, the duplex planet gear pinion is meshed with a gear ring fixedly connected on the shell, a duplex planet gear bull gear is meshed with the output sun gear, the output sun gear is supported on the shaft sleeve through a sun gear supporting bearing, the outer ring of the output sun gear is supported on a right planet carrier through a right planet carrier supporting bearing, the left planet carrier and the right planet carrier are fixed through bolts to form an integral structure, and constitute planetary gear train high-speed, low-speed output mechanism of high-speed output of sun gear and planetary carrier output; the inner circle of the input sun wheel is provided with a spline groove, the spline groove on the left side of the input sun wheel is inserted with the spline tooth of the torque sensor, the spline groove on the right side of the input sun wheel is inserted with the spline tooth of the shaft sleeve, and the torque sensor, the input sun wheel and the shaft sleeve are inserted to form an integral structure and are in clearance fit with the middle shaft to form a shaft sleeve medium-speed output mechanism; the planetary gear train high-speed and low-speed output mechanism and the shaft sleeve medium-speed output mechanism are respectively connected with the speed selection mechanism.

2. A chain wheel three-stage speed change device of a middle motor comprises a middle shaft, a speed change output mechanism and a speed selection mechanism, wherein the speed change output mechanism and the speed selection mechanism are coaxial with the middle shaft, and the speed change device is characterized in that: the variable speed output mechanism comprises a medium speed output sun gear, a duplex planet gear large and small gear, a planet gear shaft, a left planet carrier, a right planet carrier, a gear ring, an output sun gear and a shaft sleeve, wherein the medium speed output sun gear is supported on a middle shaft through a medium speed output sun gear supporting bearing, a spline groove is formed in the inner circle of the medium speed output sun gear and is in plug-connection with spline teeth of the shaft sleeve, a spline groove is formed in the inner circle of the left planet carrier and is in plug-connection with the spline teeth of a torque sensor, the planet gear shaft is supported on the left and right planet carriers, the duplex planet gear large and small gear is in sliding connection with the planet gear shaft, the medium speed output sun gear is meshed with the duplex planet gear small gear, the duplex planet gear small gear is meshed with the gear ring fixedly connected on the shell, the duplex planet gear large gear is meshed with the output sun gear, and the output sun gear is supported on the shaft sleeve through a sun gear supporting bearing, the output sun gear is a medium and high speed output part respectively, so that a high, medium and low three-gear speed output mechanism of the sun gear speed increasing output and the planet carrier low speed synchronous output is formed, and the high, medium and low three-gear speed output mechanism is respectively connected with the speed selection mechanism.

3. The chain wheel three-stage speed changing device of the centrally installed motor according to claim 1 or 2, wherein: the speed selection mechanism comprises an output sleeve and a gear control ring, a low-speed selection jack is arranged on the outer circle of the output sleeve, a high-speed selection jack is arranged on the inner circle of the output sleeve, a jack reset spring is clamped on the back surface of the jack, the low-speed selection jack is in contact with a right side planet carrier ratchet arranged on the circumference of the inner circle of a right side planet carrier, the high-speed selection jack is in contact with an output sun gear ratchet, a middle-speed selection jack groove is formed in the inner circle of a motor input gear, a middle-speed selection jack is arranged in the middle of the selection jack groove, the middle-speed selection jack is in contact with a shaft sleeve ratchet on a shaft sleeve, a positioning lug is arranged on the end surface of the output sleeve, a screw through hole is formed in the positioning lug, high-speed selection jack avoiding openings and middle-speed selection jack avoiding openings are alternately arranged on the gear control ring corresponding to the high-speed selection jack and the middle-speed selection jack, and a middle-speed friction ring is fixedly connected to the gear control ring, the middle-speed gear friction ring is connected with a high-speed gear friction ring in a sliding mode, a positioning lug is arranged at the position, corresponding to the end face of the output sleeve, of the bottom of the middle-speed gear friction ring, and is provided with a positioning lug avoiding opening, a high-speed gear friction ring protruding position is arranged at the position, corresponding to the high-speed gear friction ring protruding position, of the outer circumference of the middle-speed gear friction ring, the output sleeve is fixed with the motor input gear through a screw penetrating through the positioning lug, the gear control ring is arranged between the output sleeve and the motor input gear, a gear control ring reset spring is arranged on the positioning lug avoiding opening of the middle-speed gear friction ring, the middle-speed gear friction ring and the high-speed gear friction ring are respectively subjected to corner displacement through a damping corner mechanism, and a ratchet type middle gear and high gear speed selection mechanism is formed.

4. The chain wheel three-stage speed changing device of the built-in motor of claim 3, wherein: the damping corner mechanism comprises an intermediate-speed gear control spring, a high-speed gear control spring and a gear control motor, wherein the intermediate-speed gear control spring and the high-speed gear control spring are in an open shape, the high-speed gear control spring is clamped on the excircle of a high-speed gear friction ring, the intermediate-speed gear control spring is clamped on the excircle of a medium-speed gear friction ring, the open ends of the intermediate-speed gear control spring and the high-speed gear control spring are respectively in contact with a diamond-shaped head of the gear control motor, the closed ends of the intermediate-speed gear control spring and the high-speed gear control spring are in pin joint with a main shell of the middle-placed motor through positioning pins, and friction plates for damping the excircle of the intermediate-speed gear friction ring and the high-speed gear friction ring are arranged on the inner side of the intermediate-speed gear control spring and the high-speed gear control spring.

5. The three-stage speed changing device for the chain wheel of the centrally installed motor as claimed in claim 4, wherein: the gear control motor comprises two diamond heads, wherein the two diamond heads are in key joint with an output shaft of the gear control motor at an angle of 45 degrees, so that a gear control ring is divided into two sections of rotating angles, and high, medium and low speed selection is realized.

6. A middle motor is characterized in that: comprising a three-stage transmission incorporating a chain wheel as claimed in any one of claims 1 to 5.