CN217227830U - Chain wheel speed changing device of middle-placed motor and middle-placed motor thereof - Google Patents

Abstract

The utility model relates to an in put chain wheel speed change gear of motor, characterized by: the speed-increasing mechanism comprises a planetary gear train speed-increasing output mechanism and a fixed gear train transition wheel speed-increasing output mechanism; the speed selection mechanism comprises a radial speed selection mechanism and an axial speed selection mechanism. Has the advantages that: has the advantages that: the middle motor of installation chain wheel speed change gear selects the pedal power of two kinds of speeds of output to the chain wheel through speed selection mechanism, provides the selection of more comfortable riding experience and speed for riding passerby. The speed increasing mechanism and the middle shaft are coaxially arranged, so that the overall structure of the middle motor is more compact.

Description

Chain wheel speed changing device of middle-placed motor and middle-placed motor thereof

Technical Field

The utility model belongs to the technical field of the motor, especially, relate to a put chain wheel speed change gear of motor and put motor in it.

Background

At present, a middle-mounted motor of a power-assisted bicycle is mainly mounted on a high-end bicycle model, and consumers have high requirements on the appearance, the performance, the riding comfort and the like of the bicycle. In order to improve the pedaling force required to be kept conveniently under different riding road conditions for a rider to ensure riding comfort, the current widely applied mode is to continuously improve the series of speed change flywheels installed on a rear wheel, such as 7-speed, 8-speed, 11-speed and the like. With the increase of the number of steps of the speed changer, the size of the speed changing mechanism is increased, the maintenance and the operation of the speed changer become troublesome, and the number of steps of external speed changing is not required to be too large due to the limitation of the integral structure space of the bicycle. Patent document No. CN 103171732B discloses a crank gear for a bicycle, comprising: a pedal shaft for mounting two pedals on a free end of the pedal shaft; a driven wheel for transmitting force to a wheel of the bicycle; a planetary gear set having a sun gear, a ring gear, at least one planet wheel and a planet carrier, wherein the planet carrier is fixed in a rotationally fixed manner to the pedal shaft; and a sensor arranged on the gear ring for determining the support torque of the gear ring. The patent document No. CN 102883946B discloses a transmission of an electric bicycle for detecting torque applied to a pedal shaft. The transmission device comprises: a pedal shaft on which torque acts; a driven shaft configured for connection to a driven device; a sensor shaft offset parallel to the pedal shaft; and a force sensor coupled to the sensor shaft. The transmission also includes a drive side sensor transmission and a driven side sensor transmission. The drive-side sensor drive connects the pedal shaft to the sensor shaft and the driven-side sensor drive connects the sensor shaft to the hollow shaft. The hollow shaft is provided for connection to a driven device, and the drive-side sensor transmission has a gear ratio that differs from the gear ratio of the driven-side sensor transmission. The technical solution of the above patent document is mainly used for detecting the moment applied to the pedal shaft. Patent publication No. CN112413067A discloses a put motor many grades of regulation speed change mechanism and put motor in, it relates to moped motor field. The key points of the technical scheme comprise a variable speed input assembly, a gear shifting execution assembly, a variable speed output assembly and a gear shifting adjusting assembly; the variable speed input assembly comprises a middle shaft input sleeve and a sliding sleeve, and the sliding sleeve and the middle shaft input sleeve are in circumferential linkage fit; the gear shifting execution assembly comprises a variable speed gear ring, a planet carrier, a multi-connected planet gear and N gear shifting sun gears, and the sliding sleeve can be in circumferential linkage fit with the variable speed gear ring; the variable speed output component comprises a variable speed output sleeve in one-way linkage fit with the planet carrier; the gear shifting adjusting assembly comprises a first sliding block which can stop N gear shifting sun gears in sequence. The invention can independently bear the pedal input to realize variable speed output, can simultaneously bear the pedal input and the motor power input to realize variable speed output, can realize variable speed adjustment of 1-2N +1 gear, and can bring smoother and labor-saving riding experience to riders. The technical scheme realizes the purpose of speed change. However, the speed change mechanism cannot be coaxial with the middle shaft, and in order to realize the speed change of the motor, only one set of speed change mechanism is designed to be connected with the middle motor, and the speed change mechanism needs to be arranged in parallel with the middle shaft when being arranged in the middle motor, so that a large space is occupied, the size of the middle motor is increased, and the miniaturization and the light weight of the motor are not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome not enough among the prior art, provide a put chain wheel speed change gear of motor in and put the motor in, can realize little chain wheel acceleration rate output, reduce the reduction ratio of motor output, can enough reduce the overall dimension and the volume of motor, can realize the pedal input variable speed output of manpower again, provide wideer speed governing scope for riding passerby, adapt to the different states of riding better.

The utility model discloses a realize above-mentioned purpose, realize through following technical scheme, a put chain wheel speed change gear of motor in, characterized by: comprises a middle shaft, a speed increasing mechanism, a speed selecting mechanism and a pedaling torque detecting 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, and then pedal power with two speeds is selectively output to a chain wheel through the speed selecting mechanism,

the speed increasing mechanism comprises a planetary gear train speed increasing output mechanism and a fixed gear train transition wheel speed increasing output mechanism;

the speed selection mechanism comprises a radial speed selection mechanism and an axial speed selection mechanism;

the pedaling torque detection mechanism detects the pedaling torque from relatively immovable parts in the speed increasing mechanism.

The speed increasing mechanism comprises a left planet carrier, a right planet carrier, a planet wheel shaft, a planet wheel gear wheel, a planet wheel pinion, a gear ring, a high-speed sun wheel and a low-speed sun wheel, the planet wheel shaft is supported on the left planet carrier and the right planet carrier, the planet wheel gear wheel and the planet wheel pinion are in an integral duplex structure, the planet wheel gear wheel and the planet wheel pinion are in sliding connection with the planet wheel shaft, the planet wheel gear wheel is meshed with the gear ring, the planet wheel gear wheel is meshed with the high-speed sun wheel, the planet wheel pinion is meshed with the low-speed sun wheel, the high-speed sun wheel is supported on the middle shaft through a bearing, the low-speed sun wheel is supported on the high-speed sun wheel through a bearing, the right planet carrier is supported on the low-speed sun wheel through a planet carrier supporting bearing, the left planet carrier and the right planet carrier are in an integral structure through screw fixation, the planet carrier is an input member, and the sun wheel is a planet gear speed increasing output mechanism of an output member, the high-speed sun gear and the low-speed sun gear are connected with a speed selection mechanism.

The excircle of the gear ring is provided with a gear ring bulge, and the gear ring bulge is in contact with a pressure sensor fixed on the shell to form a pedal torque detection structure.

The speed increasing mechanism comprises a left side transition wheel support, a right side transition wheel support, a transition wheel shaft, a triple transition wheel input gear, a triple transition wheel output large gear, a triple transition wheel output small gear, a driving gear, a high-speed sun gear and a low-speed sun gear, wherein the transition wheel shaft is supported on the left side transition wheel support and the right side transition wheel support, the triple transition wheel input gear, the triple transition wheel output large gear and the triple transition wheel output small gear are connected with the transition wheel shaft in a sliding mode, the triple transition wheel input gear, the triple transition wheel output large gear and the triple transition wheel output small gear are in an integral triple structure, the triple transition wheel input gear is meshed with the driving gear, the driving gear is in key joint with the middle shaft, the triple transition wheel output large gear is meshed with the high-speed sun gear, the triple transition wheel output small gear is meshed with the low-speed sun gear, and the high-speed sun gear is supported on the middle shaft through a bearing, the low-speed sun gear is supported on the high-speed sun gear through a bearing, the right transition wheel support is supported on the low-speed sun gear through a transition wheel support right side supporting bearing, the left transition wheel support is supported on the middle shaft through a transition wheel support left side supporting bearing, the left and right transition wheel supports are of an integral structure through screw fixation, the driving wheel is an input part, the sun gear is a fixed gear train transition wheel speed-increasing output mechanism of an output part, and the high-speed sun gear and the low-speed sun gear are connected with a speed selection mechanism.

The left transition wheel bracket is in contact with a pressure sensor fixed on the shell to form a pedal torque detection structure.

The speed selection mechanism comprises a radial speed selection mechanism and an axial speed selection mechanism, the radial speed selection mechanism adopts a ratchet mechanism, the radial speed selection mechanism comprises an output sleeve and a gear control ring, the excircle of the output sleeve is provided with a low-speed selection jack, the inner circle of the output sleeve is provided with a high-speed selection jack, the back surface of the jack is clamped with a jack reset spring, the end surface of the output sleeve is provided with a positioning bulge, the positioning bulge is provided with a screw through hole, the gear control ring is in a stepped ring shape, the side wall of a small stepped ring is provided with a high-speed selection jack avoiding opening corresponding to the position of the high-speed selection jack, the end surface of a large stepped ring is provided with a positioning bulge avoiding opening corresponding to the position of the positioning bulge of the end surface of the output sleeve, the output sleeve is fixed with a motor input gear through a screw penetrated by the positioning bulge, the gear control ring is arranged between the output sleeve and the motor input gear, the gear control ring is provided with a gear control ring return spring on a positioning protrusion avoiding opening of a large stepped ring of the gear control ring, the low-speed selection jack is in contact with a ratchet of an inner ring of the low-speed sun gear, and the high-speed selection jack is in contact with a ratchet of an inner ring of the high-speed sun gear, so that the ratchet wheel type radial speed selection mechanism is formed.

Damping mechanism includes gear control spring and gear control motor, gear control spring shape is the opening form, and gear control spring clamps at the big cascade ring excircle of gear control ring, gear control spring's opening joint gear control motor square head, gear control motor square head and gear control motor output shaft key joint, the gear control spring other end passes through locating pin and motor casing pin joint, is equipped with the friction disc between the big cascade ring excircle of gear control spring and gear control ring.

The axial speed selection mechanism comprises an output sleeve, an output sleeve spline is arranged on the inner circle of the output sleeve, the output sleeve axially slides on a boss of an input gear of the motor, ratchets are arranged on two sides of the inner circle end surface of the output sleeve, high-speed and low-speed sun gear ratchets are axially distributed on the left side and the right side of the output sleeve, the output sleeve slides rightwards, and the output sleeve ratchets and the high-speed sun gear ratchets are meshed into a high-speed gear; the output sleeve slides leftwards, and the output sleeve ratchets and the low-speed sun wheel ratchets are meshed into a low-speed gear to form a sliding sleeve type axial speed selection mechanism.

A middle motor with a chain wheel speed changing device is provided.

Has the advantages that: compared with the prior art, the utility model discloses a chain wheel acceleration rate and variable speed mechanism provides more comfortable the experience of riding and wideer variable speed range for riding passerby. The speed increasing mechanism is coaxially arranged with the middle shaft; the pedal moment detection mechanism on the speed increasing mechanism detects the pedal moment from a part of the speed increasing mechanism which is not fixed relative to the main shell, so that the sensor can not participate in the movement of the crankset or the middle shaft, the crankset or the middle shaft can be kept still, the reliability of the sensor can be ensured, and the service life of the sensor can be prolonged; the utility model discloses a structural design makes and puts motor overall structure compacter in, makes it smaller and exquisite, light and more pleasing to the eye.

Drawings

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

FIG. 2 is a perspective cross-sectional view of FIG. 1;

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

FIG. 4 is an exploded view of the speed selection mechanism of FIG. 3;

FIG. 5 is a schematic view of a speed selection mechanism of embodiment 1;

FIG. 6 is a partial cross-sectional view of the speed selection mechanism of embodiment 1;

FIG. 7 is a schematic perspective view of the high-speed range operating state of embodiment 1;

FIG. 8 is a position diagram showing an operating state of a high gear in embodiment 1;

FIG. 9 is a perspective view showing a low-speed range operation state in accordance with embodiment 1;

FIG. 10 is a schematic positional view of a low-speed range operating state of embodiment 1;

fig. 11 is a schematic structural view of embodiment 2 of the present invention;

FIG. 12 is an exploded view of the speed selection mechanism of embodiment 2;

FIG. 13 is a schematic view of the speed selecting mechanism in high gear stage according to embodiment 2;

FIG. 14 is a schematic diagram showing the positional relationship in the low gear stage of the speed selecting mechanism of embodiment 2;

FIG. 15 is a perspective view of a range selection mechanism of embodiment 2;

fig. 16 is a schematic structural view of embodiment 3 of the present invention;

FIG. 17 is a schematic perspective view of embodiment 3;

FIG. 18 is a schematic structural view of example 4;

FIG. 19 is a schematic view of the transmission principle in the high gear stage of embodiment 1;

FIG. 20 is a schematic view of the transmission in the low gear stage of embodiment 1;

FIG. 21 is a schematic view of the transmission in the high gear stage of embodiment 3;

FIG. 22 is a schematic view of the transmission principle in the low gear stage of embodiment 3;

fig. 23 is a schematic structural view of a center-mounted motor adopting the structure of embodiment 1;

fig. 24 is an external view of a mid-motor using embodiments 1 to 4.

In the figure: 1. a right middle shaft, 1-1, a left middle shaft, 2, a left planet carrier, 2-1, a right planet carrier, 3, a planet wheel shaft, 4, a duplex planet wheel big gear, 4-1, a duplex planet wheel small gear, 5, a gear ring, 5-1, a gear ring bulge, 6, a high-speed sun wheel, 6-1, a high-speed sun wheel ratchet, 7, a high-speed sun wheel supporting bearing, 8, a low-speed sun wheel, 8-1, a low-speed sun wheel ratchet, 9, a low-speed sun wheel supporting bearing, 10, a planet carrier supporting bearing, 11, an output sleeve, 11-1, a positioning bulge, 11-2, an output sleeve ratchet, 11-3, an output sleeve spline, 12, a gear control ring, 12-1, a high-speed selection jack avoiding opening, 12-2, a positioning bulge avoiding opening, 13, a gear control ring reset spring, 14. friction plates, 15, a motor input gear, 15-1, a motor input gear groove, 15-2, a motor input gear boss, 16, a motor input gear inner side support bearing, 17, a chain wheel, 18, a motor input gear outer side support bearing, 19, a middle shaft support bearing, 20, a pressure sensor, 21, a speed sensor magnetic ring, 22, a speed sensor Hall, 23, a screw, 24, a low speed selection jack, 25, a high speed selection jack, 26, a jack reset spring, 27, a gear control spring, 28, a positioning pin, 29, a gear control motor, 29-1, a gear control motor square head, 29-2, a gear control motor screw, 30, a transition wheel bracket, 31, a transition wheel bracket left side support bearing, 31-1, a transition wheel bracket right side support bearing, 32, a transition wheel shaft, 33 and a triple transition wheel input gear, 33-1 parts of a triple transition wheel output large gear, 33-2 parts of a triple transition wheel output small gear, 34 parts of a driving gear, 35 parts of a main shell, 36 parts of a left end cover, 37 parts of a right end cover, 38 parts of a stator, 39 parts of a rotor, 40 parts of a motor gear head, 41 parts of a first-stage reduction large gear, 42 parts of a motor-side one-way clutch, 43 parts of a second-stage reduction small gear, 44 parts of a controller, 45 parts of an output sleeve fixing screw, 46 parts of a shifting fork.

Detailed Description

The following detailed description of the embodiments according to the present invention with reference to the preferred embodiments is as follows: referring to the drawings in detail, the embodiment provides a chain wheel speed changing device with a middle-mounted motor, which is characterized in that: the speed-increasing mechanism comprises a planetary gear train speed-increasing output mechanism and a fixed gear train transition wheel speed-increasing output mechanism; the speed selection mechanism comprises a radial speed selection mechanism and an axial speed selection mechanism; the pedaling torque detection mechanism detects the pedaling torque from relatively immovable parts in the speed increasing mechanism.

Example 1

Planetary gear train and radial speed selection

With specific reference to the attached drawings 1-2, in a preferred scheme of this embodiment, the speed increasing mechanism comprises a left side planet carrier 2, a right side planet carrier 2-1, a planet wheel shaft 3, a duplex planet wheel gear 4, a duplex planet wheel pinion 4-1, a gear ring 5, a high-speed sun gear 6 and a low-speed sun gear 8, the planet wheel shaft 3 is supported on the left side planet carrier and the right side planet carrier, the duplex planet wheel gear and the duplex planet wheel pinion are in an integral duplex structure, the duplex planet wheel gear and the duplex planet wheel pinion are in sliding connection with the planet wheel shaft, the planet wheel gear is meshed with the gear ring, the planet wheel gear is meshed with the high-speed sun gear, the planet wheel pinion is meshed with the low-speed sun gear, the high-speed sun gear is supported on a central shaft through a high-speed sun gear support bearing 7, the low-speed sun gear is supported on the high-speed sun gear through a low-speed sun gear support bearing 9, the right side planet carrier is supported on the low-speed sun gear through a planet carrier supporting bearing 10, the left side planet carrier and the right side planet carrier are fixed through screws 23 to form an integral structure, the planet carrier is an input part, the sun gear is a planetary gear train speed-increasing output mechanism of an output part, and the high-speed sun gear and the low-speed sun gear are connected with a speed selection mechanism. The excircle of the gear ring is provided with a gear ring bulge 5-1, and the gear ring bulge is in contact with a pressure sensor 20 fixed on the shell to form a pedal torque detection structure.

As shown in fig. 1 and fig. 19, a 2K-H transmission structure is adopted, a planet carrier is an input member, a sun gear is an output member, and the speed is increased for output. The middle shaft power drives the planet carrier and the duplex planet wheel to rotate, the big pinion and the small pinion of the duplex planet wheel are respectively meshed with the high-speed sun wheel and the low-speed sun wheel, the pedal power is output at two speeds, and the specific parameters are shown in the following table:

high-gear reduction ratio:

low gear reduction ratio:

as shown above, the gear ratio from the middle shaft to the crankset is that the gear ratio i is 0.315, the middle shaft rotates 1 cycle when the gear ratio i is 0.429, the crankset rotates 1/0.3714 when the gear ratio is high is 3.17 cycles, and the crankset rotates 1/0.429 when the gear ratio is low is 2.33 cycles, i.e., the step-up output.

When the middle shaft rotates, the high-speed sun wheel and the low-speed sun wheel rotate in the same direction at the same time, and the rotating speed of the high-speed sun wheel is always higher than that of the low-speed sun wheel.

In detail, as shown in the attached drawings 3-8, the radial speed selection mechanism adopts a ratchet mechanism, the radial speed selection mechanism comprises an output sleeve 11 and a gear control ring 12, the outer circle of the output sleeve is provided with a low-speed selection jack 24, the inner circle of the output sleeve is provided with a high-speed selection jack 25, the back surface of the jack is clamped with a jack reset spring 26, the end surface of the output sleeve is provided with a positioning bulge, the positioning bulge is provided with a screw through hole, the gear control ring is in a stepped ring shape, the side wall of a small stepped ring is provided with a high-speed selection jack avoiding opening 12-1 corresponding to the position of the high-speed selection jack, the end surface of a large stepped ring is provided with an output sleeve positioning bulge avoiding opening 12-2 corresponding to the position of the end surface of the output sleeve, the output sleeve 11 is fixed with a motor input gear 15 through a screw penetrating through the positioning bulge 11-1, a motor input gear groove 15-1 is mutually meshed with the output sleeve bulge, the output sleeve is connected with the motor input gear, the gear control ring is arranged between the output sleeve and the motor input gear and performs rotary displacement through a damping mechanism, a positioning protrusion avoiding opening of a large step ring of the gear control ring is provided with a gear control ring reset spring 13, the low-speed selection jack is in contact with a ratchet of an inner ring of the low-speed sun gear, and the high-speed selection jack is in contact with a ratchet of an inner ring of the high-speed sun gear to form the ratchet type radial speed selection mechanism. The damping mechanism comprises a gear control spring 27 and a gear control motor 29, the gear control spring is in an open shape, the gear control spring is clamped on the outer circle of a large stepped ring of the gear control ring, the open end of the gear control spring is clamped with a gear control motor square head 29-1, the gear control motor square head is in key joint with an output shaft of the gear control motor, the other end of the gear control spring is in pin joint with a middle motor shell through a gear control spring positioning pin 28, and a friction plate 14 is arranged between the gear control spring and the outer circle of the large stepped ring of the gear control ring.

As shown in fig. 7 and 8, when the gear control spring is spread by the square head of the gear control motor, the friction plate is separated from the gear control ring, the gear control ring rotates clockwise to the position shown in fig. 8 under the action of the return spring of the gear control ring, at this time, the high-speed selection jack is not in contact with the gear control ring, and the high-speed selection jack and the low-speed selection jack are in contact with the high-speed sun gear ratchet and the low-speed sun gear ratchet respectively under the action of the return spring of the jack. When the middle shaft rotates clockwise, the high-speed sun wheel and the low-speed sun wheel also rotate clockwise, the high-speed sun wheel ratchet drives the output sleeve to rotate synchronously through the high-speed selection jack because the rotating speed of the high-speed sun wheel is higher than that of the low-speed sun wheel, and the low-speed selection jack and the low-speed sun wheel ratchet slip because the rotating speed of the output sleeve is higher than that of the low-speed sun wheel. The output sleeve drives the motor input gear and the toothed disc to rotate at a high position.

As shown in fig. 9 and 10, after the square head of the gear control motor rotates, when the gear control spring falls down, the friction plate contacts with the gear control ring, when the middle shaft rotates clockwise, the high-speed and low-speed sun gears, the output sleeve and the gear control ring also rotate clockwise, the gear control ring 12 rotates counterclockwise by a certain angle relative to the output sleeve under the action of the friction force of the friction plate and rotates to the position shown in fig. 10, at this time, the gear control ring jacks the high-speed selection jack outwards to be separated from the high-speed sun gear ratchet, and only the low-speed selection jack contacts with the low-speed sun gear ratchet. The low-speed sun gear ratchet drives the output sleeve to synchronously rotate through the low-speed selection jack, and the high-speed sun gear idles because the high-speed selection jack is jacked up. The output sleeve drives the motor input gear and the chain wheel to rotate at a low gear.

Transmission path of power: when the treading force is transmitted through the middle shaft → the planet carrier → the planet wheel → the sun wheel → the output sleeve → the input gear of the motor → the chain wheel. The process of detecting the pedaling torque: the gear ring has the trend of rotating in the same direction as the middle shaft, the pressure sensor blocks the gear ring bulge 5-1 to enable the gear ring not to rotate, the pressure sensor provides a rotation stopping torque for the gear ring, the linear relation is formed between the rotation stopping torque and the pedaling force, the torque signal is provided for the controller to serve as an input signal corresponding to the pedaling torque of a rider, the pedaling torque of the rider can be accurately measured, the riding state and the riding intention of the rider can be quickly read, the boosting power can be well matched, and the best boosting effect is achieved. The detent torque providing member may be a pressure sensor or a torque sensor.

Example 2

Planetary gear train and axial speed selection

As shown in fig. 11 to 15, the planetary gear train is the same as embodiment 1, and will not be described again. Only the axial speed selection mechanism structure will be described. The axial speed selection mechanism comprises an output sleeve, an output sleeve spline is arranged on the inner circle of the output sleeve, the output sleeve axially slides on a boss 15-2 of the motor input gear, ratchets are arranged on two sides of the inner circle end surface of the output sleeve, high-speed and low-speed sun gear ratchets are axially distributed on the left side and the right side of the output sleeve, the output sleeve slides rightwards, and the output sleeve ratchets and the high-speed sun gear ratchets are meshed into a high-speed gear; the output sleeve slides leftwards, and the output sleeve ratchets are meshed with the low-speed sun wheel ratchets to form a low-speed gear to form a sliding sleeve type axial speed selection mechanism.

As described above, as shown in fig. 11, embodiment 2 differs from embodiment 1 in the shift position selection structure. In the embodiment 1, the high-speed and low-speed sun wheel ratchets are radially distributed on the inner side and the outer side of the output sleeve, and the meshing of the high-speed selection jack is controlled to switch gears; in embodiment 2, the high-speed and low-speed sun gear ratchets are axially distributed on the left and right sides of the output sleeve, and the output sleeve is controlled to slide left and right to switch gears. The gear control motor screw drives the shifting fork to move axially to switch gears.

Example 3

Fixed gear train + radial speed selection

In detail, as shown in the attached drawings 16-17, the embodiment is a preferred scheme of another speed increasing mechanism structure, the speed increasing mechanism comprises a left side transition wheel support 30, a right side transition wheel support 30, a transition wheel shaft 30, a triple transition wheel input gear 33, a triple transition wheel output large gear 33-1, a triple transition wheel output small gear 33-2, a driving gear 34, a high-speed sun gear 6 and a low-speed sun gear 8, transition wheel shafts are supported on the left side transition wheel support and the right side transition wheel support, the transition wheel shafts are connected with a triple transition wheel input gear, a triple transition wheel output large gear and a triple transition wheel output small gear in a sliding manner, the triple transition wheel input gear, the triple transition wheel output large gear and the triple transition wheel output small gear are in an integral triple structure, the triple transition wheel input gear is meshed with the driving gear, the driving gear is in key joint with a middle shaft, the three-connection transition wheel output large gear is meshed with the high-speed sun gear, the three-connection transition wheel output small gear is meshed with the low-speed sun gear, the high-speed sun gear is supported on the middle shaft through a bearing, the low-speed sun gear is supported on the high-speed sun gear through a bearing, the right-side transition wheel support is supported on the low-speed sun gear through a transition wheel support right-side support bearing 31-1, the left-side transition wheel support is supported on the middle shaft through a transition wheel support left-side support bearing 31, the left-side transition wheel support and the right-side transition wheel support are fixed through screws 23 to form a fixed gear train transition wheel speed-increasing output mechanism with a driving wheel as an input part and a sun wheel as an output part, and the high-speed sun gear and the low-speed sun gear are connected with a speed selection mechanism. The left transition wheel bracket is in contact with a pressure sensor fixed on the shell to form a pedal torque detection structure.

The modulus and the number of teeth of the gears in the gear train speed-increasing output mechanism are the best embodiment. The motor volume should not be too big in guaranteeing to put, and can guarantee the utility model discloses a design advantage, the optional 0.5-2.0m of modulus of gear, the optional 18-72 teeth of number of teeth of high-speed sun gear, the optional 10-40 teeth of number of teeth of duplex planet wheel gear wheel.

As shown in fig. 16, a fixed gear train transition wheel transmission structure is adopted, a driving wheel is an input member, a sun wheel is an output member, and the speed is increased for output. The middle shaft power drives the driving wheel and the triple transition wheel input gear to rotate, the output big gear and the output small gear of the triple transition wheel are respectively meshed with the high-speed sun gear and the low-speed sun gear, the pedal power is output at two speeds, and the specific parameters are shown in the following table:

high-gear reduction ratio:

low gear reduction ratio:

as shown above, the gear ratio from the middle shaft to the crankset, i is 0.612 for the high gear and 0.915 for the low gear, respectively, the middle shaft rotates for 1 cycle, the crankset rotates for 1/0.612 for 1.63 cycles in the high gear, and the crankset rotates for 1/0.915 for 1.09 cycles in the low gear, i.e., the step-up output.

The speed selection mechanism of this embodiment is the same as the radial speed selection mechanism of embodiment 1.

The transmission path of the power and the process of detecting the treading torque of the embodiment are as follows:

when the treading force is transmitted through the middle shaft → the driving gear → the transition gear → the sun gear → the output sleeve → the motor input gear → the chain wheel. The transition wheel support has the trend of rotating in the same direction as the middle shaft, the pressure sensor blocks the transition wheel support to prevent the transition wheel support from rotating, the pressure sensor provides a rotation stopping torque for the transition wheel support at the moment, the rotation stopping torque and the treading force have a linear relation, a torque signal is provided for the controller to serve as an input signal corresponding to the treading torque of a rider, the treading torque of the rider can be accurately measured, the riding state and the riding intention of the rider can be read quickly, the boosting power can be well matched, and the best boosting effect is achieved. The transition wheel support of this embodiment makes fan-shaped or semi-circular purpose reduce overall structure's weight, and the triplex gear only sets up one set simultaneously, and if the mechanism needs the transition wheel support to set up to full circle and the triplex gear sets up 1-3 and organizes.

Example 4

The fixed gear train and the axial speed selection,

as shown in fig. 18, embodiment 4 differs from embodiment 3 in the gear position selecting structure, and specifically, the difference between embodiment 4 and embodiment 3 is the same as the difference between embodiment 2 and embodiment 1.

As shown in fig. 1, the planetary gear train speed-increasing output mechanism of embodiment 1 adopts a radial speed selection mechanism, i.e. high-speed and low-speed sun gear ratchets are radially distributed on the inner circle and the outer circle of an output sleeve, and the engagement of a high-speed selection jack is controlled to switch gears;

as shown in fig. 11, the planetary gear train speed-increasing output mechanism of embodiment 2 adopts an axial speed selection mechanism, that is, the ratchets of the high-speed sun gear and the low-speed sun gear are axially distributed on the left side and the right side of the output sleeve, and the output sleeve is controlled to slide left and right to switch gears.

As shown in fig. 16, the fixed gear train transition wheel speed-increasing output mechanism of embodiment 3 adopts a radial speed selection mechanism, i.e. high-speed and low-speed sun wheel ratchets are radially distributed on the inner circle and the outer circle of an output sleeve, and the engagement of a high-speed selection jack is controlled to switch gears;

as shown in fig. 18, the fixed gear train transition wheel speed increasing output mechanism of embodiment 4 adopts an axial speed selection mechanism, that is, the ratchets of the high-speed sun gear and the low-speed sun gear are axially distributed on the left side and the right side of the output sleeve, and the output sleeve is controlled to slide left and right to switch gears.

The module and the tooth number of the gear in the fixed gear train transition gear transmission structure of the embodiment are the best embodiment. The volume of the motor in the middle is not too large, and the design advantage of the utility model can be ensured, the modulus of the gear can be selected to be 0.5-2.0m, the tooth number of the high-speed sun gear can be selected to be 18-72 teeth, and the tooth number of the triple transition gear output gear wheel can be selected to be 10-40 teeth.

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.

Example 5

Referring to fig. 23-24, a central motor with a chain wheel speed variator is shown.

As shown in fig. 23, in the central motor of the chain wheel speed-increasing and variable speed mechanism according to embodiment 1, the motor power passes through the motor tooth head → the first-stage large reduction gear → the motor-side one-way clutch → the second-stage small reduction gear → 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: middle shaft → planet carrier → planet wheel → sun gear → output sleeve → motor input gear → toothed disc. (taking example 1 as an example)

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 mutual interference is avoided.

When the bicycle is ridden by pure electric power, the middle shaft, the planet carrier, the planet wheel and the sun wheel are in a static state, the input gear of the motor and the output sleeve rotate synchronously, the jack on the output sleeve slips with the ratchet of the sun wheel, and the main shaft cannot be driven to rotate and do not interfere with each other.

When the reverse vehicle is pushed by manpower, the chain wheel becomes a driving part, although the speed increasing mechanism has two speed transmission ratios, the selection states of two speed transmission paths of the radial 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 and low-speed selection jacks are respectively meshed with the high-speed and low-speed sun wheel ratchets, and because the speed increasing ratio of the high-speed sun wheel is high, the rotating speed is higher than that of the low-speed sun wheel, namely, the low-speed selection jacks drive the low-speed sun wheel to synchronously rotate, and at the moment, the high-speed sun wheel slips, so that a transmission path is still maintained; if when the speed selection mechanism is in the low-speed gear, the motor input gear rotates reversely at the moment, and simultaneously drives the gear control ring 12 to rotate reversely, the gear control ring is forced to overcome the friction force to reset, so that the speed selection mechanism is in the high-speed gear state, a transmission path is still maintained, and the mutual interference of the two speed transmission paths is avoided.

In the traditional middle-placed motor, the reduction ratio between a motor rotor and a toothed disc is designed according to the target of 60-70rpm of the output rotating speed of the toothed disc during design, the optimal range of the reduction ratio is approximately 25-30 according to experience, and a two-stage or three-stage reduction design is generally adopted. Under the conventional condition, the pedaling speed of a power-assisted bicycle rider is kept at 60-70rpm, the number of teeth of a chain wheel is 42-48, and the riding speed is 15-25Km/h, so that the riding requirement of most riders can be met. The utility model discloses an acceleration mechanism's key feature is: 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, and then pedal power with two speeds is selectively output to the chain wheel through the speed selecting mechanism, and the two speeds can be switched.

Taking the structure of the embodiment 1 as an example, when the speed increasing ratio from the middle shaft of the pedal of the rider to the chain wheel is approximately 1:2 or 1:3 (the pedal drives the middle shaft to be active), the rotating speed of the chain wheel is about 2-3 times of the rotating speed of the middle shaft, and the same riding speed can be ensured as long as 14-18 teeth are designed on the number of the chain wheel teeth.

The utility model discloses put motor work in participating in, the effect analysis of its performance:

according to the rotating speed and the reduction ratio of the conventional power-assisted bicycle: the pedal rotating speed of the rider is 60rpm, the number of teeth of the chain wheel is 42-48, the chain wheel drives the flywheel through a chain, and the rotating speed transmitted to the rear wheel is 180 rpm; the reduction ratio of the middle motor is set to be 30, the rotating speed of the output gear of the motor is 1800rpm, and the volume of the middle motor is large due to the transmission ratio;

the utility model discloses participate in the centrally-mounted motor work back to the speed increasing ratio of pedal axis to chain wheel is 1:3, then the pedal rotational speed of riding passerby still is 60rpm, and the chain wheel rotational speed then is 180rpm, and the number of teeth of chain wheel only needs 14-18 teeth, and the chain wheel passes through the chain and drives the flywheel, and the rotational speed of transmitting to the rear wheel keeps unchanged for 180rpm, if the rotational speed of motor output gear still is 1800rpm, the speed reducing ratio of centrally-mounted motor can sharply reduce to 10, because the utility model discloses a participation, the gear of centrally-mounted motor then can reduce, greatly simplifies the speed reducing structure of motor side, can make the whole size miniaturization of motor; more importantly, the utility model discloses a structure can switch between two kinds of speed ratios, and pedal power take off can have wideer speed governing scope according to the demand of riding, and adaptability is stronger, and it is more comfortable to ride.

The above detailed description of the chain wheel transmission device 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 (9)

1. A chain wheel speed changing device of a middle-placed motor is characterized in that: comprises a middle shaft, a speed increasing mechanism, a speed selecting mechanism and a pedaling torque detecting 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, and then pedal power with two speeds is selectively output to a chain wheel through the speed selecting mechanism,

the speed increasing mechanism comprises a planetary gear train speed increasing output mechanism and a fixed gear train transition wheel speed increasing output mechanism;

the speed selection mechanism comprises a radial speed selection mechanism and an axial speed selection mechanism;

the pedal moment detection mechanism detects pedal moment from a part which is fixed relative to the main shell in the speed increasing mechanism.

2. The apparatus of claim 1, wherein the chain wheel speed changing device comprises: the speed increasing mechanism comprises a left planet carrier, a right planet carrier, a planet wheel shaft, a planet wheel gear wheel, a planet wheel pinion, a gear ring, a high-speed sun wheel and a low-speed sun wheel, the planet wheel shaft is supported on the left planet carrier and the right planet carrier, the planet wheel gear wheel and the planet wheel pinion are in an integral duplex structure, the planet wheel gear wheel and the planet wheel pinion are in sliding connection with the planet wheel shaft, the planet wheel gear wheel is meshed with the gear ring, the planet wheel gear wheel is meshed with the high-speed sun wheel, the planet wheel pinion is meshed with the low-speed sun wheel, the high-speed sun wheel is supported on the middle shaft through a bearing, the low-speed sun wheel is supported on the high-speed sun wheel through a bearing, the right planet carrier is supported on the low-speed sun wheel through a planet carrier supporting bearing, the left planet carrier and the right planet carrier are in an integral structure through screw fixation, the planet carrier is an input member, and the sun wheel is a planet gear system speed increasing output mechanism of an output member, the high-speed sun gear and the low-speed sun gear are connected with a speed selection mechanism.

3. The apparatus of claim 2, wherein the chain wheel transmission device comprises: the excircle of the gear ring is provided with a gear ring bulge, and the gear ring bulge is in contact with a pressure sensor fixed on the shell to form a pedal torque detection structure.

4. The apparatus of claim 1, wherein the chain wheel speed changing device comprises: the speed increasing mechanism comprises a left side transition wheel support, a right side transition wheel support, a transition wheel shaft, a triple transition wheel input gear, a triple transition wheel output large gear, a triple transition wheel output small gear, a driving gear, a high-speed sun gear and a low-speed sun gear, wherein the transition wheel shaft is supported on the left side transition wheel support and the right side transition wheel support, the triple transition wheel input gear, the triple transition wheel output large gear and the triple transition wheel output small gear are connected with the transition wheel shaft in a sliding mode, the triple transition wheel input gear, the triple transition wheel output large gear and the triple transition wheel output small gear are in an integral triple structure, the triple transition wheel input gear is meshed with the driving gear, the driving gear is in key joint with the middle shaft, the triple transition wheel output large gear is meshed with the high-speed sun gear, the triple transition wheel output small gear is meshed with the low-speed sun gear, and the high-speed sun gear is supported on the middle shaft through a bearing, the low-speed sun gear is supported on the high-speed sun gear through a bearing, the right transition wheel support is supported on the low-speed sun gear through a transition wheel support right side supporting bearing, the left transition wheel support is supported on the middle shaft through a transition wheel support left side supporting bearing, the left and right transition wheel supports are of an integral structure through screw fixation, the driving wheel is an input part, the sun gear is a fixed gear train transition wheel speed-increasing output mechanism of an output part, and the high-speed sun gear and the low-speed sun gear are connected with a speed selection mechanism.

5. The apparatus of claim 4, wherein the chain wheel transmission device comprises: the left transition wheel bracket is in contact with a pressure sensor fixed on the shell to form a pedal torque detection structure.

6. The apparatus of claim 2 or 4, wherein: the speed selection mechanism is a radial speed selection mechanism which adopts a ratchet mechanism and comprises an output sleeve and a gear control ring, the excircle of the output sleeve is provided with a low-speed selection jack, the inner circle of the output sleeve is provided with a high-speed selection jack, the back of the jack is clamped with a jack reset spring, the end face of the output sleeve is provided with a positioning bulge, the positioning bulge is provided with a screw through hole, the gear control ring is in a stepped ring shape, the side wall of a small stepped ring is provided with a high-speed selection jack avoiding opening corresponding to the position of the high-speed selection jack, the end face of a large stepped ring is provided with a positioning bulge avoiding opening corresponding to the position of the positioning bulge of the end face of the output sleeve, the output sleeve is fixed with a motor input gear through a screw penetrated by the positioning bulge, the gear control ring is arranged between the output sleeve and the motor input gear and is in rotary displacement through a damping mechanism, the positioning bulge avoiding opening of the large stepped ring of the gear control ring is provided with a gear control ring reset spring, the low-speed selection jack is in contact with the ratchet of the inner ring of the low-speed sun wheel, and the high-speed selection jack is in contact with the ratchet of the inner ring of the high-speed sun wheel, so that the ratchet wheel type radial speed selection mechanism is formed.

7. The apparatus of claim 6, wherein the chain wheel speed changing device comprises: damping mechanism includes gear control spring and gear control motor, gear control spring shape is the opening form, and gear control spring clamps at the big cascade ring excircle of gear control ring, gear control spring's opening joint gear control motor square head, gear control motor square head and gear control motor output shaft key joint, the gear control spring other end passes through locating pin and motor casing pin joint, is equipped with the friction disc between the big cascade ring excircle of gear control spring and gear control ring.

8. The apparatus of claim 2 or 4, wherein: the speed selection mechanism is an axial speed selection mechanism, the axial speed selection mechanism comprises an output sleeve, an output sleeve spline is arranged on the inner circle of the output sleeve, the output sleeve axially slides on a boss of an input gear of the motor, ratchets are arranged on two sides of the end face of the inner circle of the output sleeve, the high-speed and low-speed sun gear ratchets are axially distributed on the left side and the right side of the output sleeve, the output sleeve slides rightwards, and the output sleeve ratchets and the high-speed sun gear ratchets are meshed into a high-speed gear; the output sleeve slides leftwards, and the output sleeve ratchets and the low-speed sun wheel ratchets are meshed into a low-speed gear to form a sliding sleeve type axial speed selection mechanism.

9. A middle motor is characterized in that: comprising a centrally located motor fitted with a chain wheel transmission according to any of claims 1 to 8.

Images