CN107685828B - Stepless speed change transmission device for electric bicycle - Google Patents
Stepless speed change transmission device for electric bicycle Download PDFInfo
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- CN107685828B CN107685828B CN201710846046.9A CN201710846046A CN107685828B CN 107685828 B CN107685828 B CN 107685828B CN 201710846046 A CN201710846046 A CN 201710846046A CN 107685828 B CN107685828 B CN 107685828B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
- B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
- B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M7/00—Motorcycles characterised by position of motor or engine
- B62M7/02—Motorcycles characterised by position of motor or engine with engine between front and rear wheels
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- Combustion & Propulsion (AREA)
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- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
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Abstract
A stepless speed change transmission device of an electric bicycle belongs to the technical field of electric bicycles and comprises a first motor, a second motor, a middle shaft and a planetary gear mechanism which is coaxially arranged with the middle shaft; planetary gear mechanism include sun gear, inside and outside ring gear, planet carrier and planetary gear, the sun gear pass through the clutch cover and establish epaxially, inside and outside ring gear be equipped with ring gear internal tooth and ring gear external tooth, planetary gear circumference equipartition on the planet carrier and respectively with sun gear, ring gear internal tooth meshing, first motor passes through gear engagement with the ring gear external tooth, planet carrier axial one side pass through gear engagement with the second motor, the axial opposite side is equipped with its fixed connection's output dental disc subassembly. The invention realizes stepless speed change output by adding the motor, and ensures the smoothness and continuity of speed change.
Description
Technical Field
The invention relates to a technology in the field of electric bicycles, in particular to a stepless speed change transmission device of an electric bicycle.
Background
The existing electric bicycle mid-set transmission in the market mostly adopts a gear transmission mechanism to connect a motor and a chain wheel, and the speed change function of a mid-set transmission system is realized by increasing the number of gears. The speed change system has high requirements on the strength and the service life of the gear, the production cost is high, and meanwhile, the condition of discontinuous speed change can occur during speed change.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the stepless speed change transmission device of the electric bicycle, which realizes stepless speed change output by adding the motor and ensures the smoothness, continuity and reliability of speed change.
The invention is realized by the following technical scheme:
the invention relates to a stepless speed change transmission device of an electric bicycle, which comprises a first motor, a second motor, a middle shaft and a planetary gear mechanism which is coaxially arranged with the middle shaft; planetary gear mechanism include sun gear, inside and outside ring gear, planet carrier and planetary gear, the sun gear pass through the clutch cover and establish epaxially, inside and outside ring gear be equipped with ring gear internal tooth and ring gear external tooth, planetary gear circumference equipartition on the planet carrier and respectively with sun gear, ring gear internal tooth meshing, first motor passes through gear engagement with the ring gear external tooth, planet carrier axial one side pass through gear engagement with the second motor, the axial opposite side is equipped with fixed connection's output dental disc subassembly with it.
The first motor is provided with a first output shaft, and a first output shaft gear is arranged on the first output shaft; the second motor is provided with a second output shaft, and a second output shaft gear is arranged on the second output shaft.
The planet support is sleeved with an inner gear ring and an outer gear ring at one axial side through a bearing, the planet support is provided with a planet support excircle gear, the second output shaft gear is meshed with the planet support excircle gear, the first output shaft gear is meshed with the gear ring outer teeth through a secondary gear, the secondary gear comprises a secondary first gear and a secondary second gear which are coaxially arranged, the secondary second gear is meshed with a first motor output shaft gear, and the secondary first gear is meshed with the gear ring outer teeth; correspondingly, the planetary gear is a single-stage gear.
The first output shaft gear is meshed with the outer teeth of the gear ring, the planet support is provided with a planet support excircle gear, and the second output shaft gear is meshed with the planet support excircle gear; correspondingly, the planet gear adopts a duplicate gear which comprises a first gear and a second gear which are coaxially arranged; the first gear is meshed with the sun gear, and the second gear is meshed with the inner teeth of the gear ring.
The stepless speed change transmission device of the electric bicycle is fixed on the frame connector, the frame connector and the frame are of an integrated structure, and a middle shaft of the stepless speed change transmission device is fixedly connected with the crank assembly at two ends.
Technical effects
Compared with the prior art, the invention can realize variable speed output by adding the motor without adopting a complex speed changer in the traditional speed change mechanism, thereby ensuring the consistency and the reliability of variable speed.
Drawings
FIG. 1 is a sectional view of example 1;
FIG. 2 is a schematic view of the assembly of embodiment 1 on a bicycle frame;
FIG. 3 is an exploded view of FIG. 2;
FIG. 4 is an exploded view of example 1;
FIG. 5 is a schematic view of the main housing, the control unit and the motor of embodiment 1;
FIG. 6a is a first view of the internal structure of embodiment 1;
FIG. 6b is a second view of the internal structure of embodiment 1;
FIG. 7a is a first view of the planetary gear mechanism in embodiment 1;
FIG. 7b is a second view of the planetary gear mechanism in embodiment 1;
FIG. 8 is an exploded view of the planetary gear mechanism in embodiment 1;
FIG. 9 is the power variable transmission chain of embodiment 1;
FIG. 10 is a sectional view of embodiment 2;
FIG. 11a is a first view of the structure of the planetary gear mechanism and the motor in embodiment 2;
FIG. 11b is a second view of the planetary gear mechanism and motor structure in embodiment 2;
in the figure: the transmission device comprises a first end cover 1, a second end cover 2, a secondary gear 3, an inner gear ring and an outer gear ring 4, a main shell 5, a fixed screw seat 6, a sun gear 8, a middle shaft 9, a needle roller clutch 10, a planetary gear mechanism 11, a first motor 12, an output gear disc assembly 13, a locking ring 14, a second motor 15, a fourth positioning snap spring 16, a first positioning snap spring 17, a second positioning snap spring 18, a fourth screw 19, a fifth screw 20, a lead 21, a control unit 22, a third positioning snap spring 23, a sun gear washer 24, a fixed screw 25, a third screw 26, a secondary first gear 3A, a secondary second gear 3B, a gear ring inner tooth 4A, a gear ring outer tooth 4B, a planetary support 11A, a planetary gear 11B, a planetary gear washer 11C, a planetary gear shaft 11D, a third positioning snap spring 11E, a planetary support outer gear 11F, a planetary support outer spline 11G, a first gear 11H, a second gear 11J, a first output shaft 12A, a first output shaft gear 12B, a gear support 13A, a gear 13B, a crank shaft support 13B, a screw assembly 15, a screw assembly, a crank shaft assembly 15B, a transmission device frame assembly 100, a screw assembly 15 and a.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 2 and fig. 3, the present embodiment relates to a continuously variable transmission 100, the continuously variable transmission 100 is fastened to a frame connecting body 102 through a fixing screw seat 6 and a fixing screw 25, the frame connecting body 102 and a frame 101 are of an integral structure, the continuously variable transmission 100 is provided with a middle shaft 9, and two ends of the middle shaft 9 are fixedly connected to a crank assembly 103.
As shown in fig. 1, 4 and 5, the continuously variable transmission 100 includes: a first electric motor 12, a second electric motor 15, a main housing 5, a first end cap 1, a second end cap 2, an output disc assembly 13, a middle shaft 9, and a planetary gear mechanism 11 arranged coaxially with the middle shaft 9, wherein: the main casing body 5 is fixedly connected with the first end cover 1 and the second end cover 2 respectively, the first motor 12 and the second motor 15 are locked and fixed on the main casing body 5 through a fourth screw 19, a control unit 22 is installed on the main casing body 5, the control unit 22 is connected with a battery through a lead 21, and the control unit 22 is connected with the first motor 12 and the second motor 15 respectively to control power output.
As shown in fig. 1, 7a, 7b and 8, the planetary gear mechanism 11 includes: planet carrier 11A, planetary gear 11B, planet gear axle 11D, inner and outer ring gear 4 and sun gear 8, wherein: the planet gear shafts 11D are circumferentially and uniformly distributed on the planet support 11A, the planet gears 11B are fixed on the planet gear shafts 11D through support bearings and are provided with planet gear gaskets 11C at two ends of the planet gear shafts 11D corresponding to the support bearings, the sun gear 8 is sleeved on the middle shaft 9 through a needle roller clutch 10 and is meshed with the planet gears 11B, the sun gear 8 is axially positioned through a third positioning snap spring 23 and a sun gear gasket 24, the planet support 11A is sleeved with an inner gear ring and an outer gear ring 4 at one axial side through a bearing, the inner gear ring and the outer gear ring 4 comprise an inner gear ring 4A and an outer gear ring 4B, the inner gear ring 4A is meshed with the planet gears 11B, the outer gear ring 4B is meshed with the first motor 12 through a gear, and the output chain wheel assembly 13 is fixed on the planet support 11A through outer splines 11G of the planet support and is locked and positioned through a locking ring 14.
As shown in fig. 1, fig. 6a and fig. 6B, the first motor 12 is provided with a first output shaft 12A, the first output shaft 12A is provided with a first output shaft gear 12B, the first output shaft gear 12B is in meshing transmission with the inner and outer gear rings 4 through a secondary gear 3, the secondary gear 3 includes a secondary first gear 3A and a secondary second gear 3B, the secondary first gear 3A is in meshing transmission with the outer teeth 4B of the gear rings, the secondary second gear 3B is in meshing transmission with the first output shaft gear 12B, and two ends of the secondary gear 3 are arranged on the first end cover 1 and the main housing 5 through bearings;
the second motor 15 is provided with a second output shaft 15A, the second output shaft 15A is provided with a second output shaft gear 15B, the second output shaft gear 15B is meshed with the planet carrier excircle gear 11F, and the planet carrier excircle gear 11F is positioned on the planet carrier 11A through a third positioning clamp spring 11E.
As shown in fig. 1, 3 and 4, the middle shaft 9 is sleeved with a first end cover 1 and a planet carrier 11A through a bearing, the planet carrier 11A is sleeved on the first end cover 1 through a bearing at one axial side and sleeved with a main housing 5 and a second end cover 2 through a bearing; the first end cover 1 is fixed on the main shell 5 through a third screw 26, the second end cover 2 is fixed on the main shell 5 through a fifth screw 20, and the main shell 5 fixing screw seat 6 and the fixing screw 25 are fixed on the frame 101.
As shown in fig. 1 and 4, the output disc assembly 13 includes: chain wheel support 13A, chain wheel 13B, chain lid 13C, screw seat 13D and first screw 13E, wherein: the chain wheel 13B is sleeved on the inner side of the excircle of the chain wheel support 13A, the chain cover 13C is sleeved on the outer side of the excircle of the chain wheel support 13A, the chain wheel 13B and the chain cover 13C are fastened through the screw base 13D and the first screw 13E, the chain wheel support 13A is provided with a chain wheel support internal spline 13F, the locking ring 14 is meshed with the chain wheel support internal spline 13F, and the output chain wheel assembly 13 is axially locked on the middle shaft 9 through the locking ring 14.
As shown in fig. 9, in operation, the present embodiment realizes transmission and speed change by the following means:
1) The middle shaft 9As input ends, the first motor 12 and the second motor 15 do not output power, and the inner gear ring 4 and the outer gear ring 4 are fixed; the power input by the crank assembly 103 is transmitted to the sun gear 8 through the needle roller clutch 10 to drive the planetary gear 11B to operate, the planetary gear 11B drives the planetary support 11A to operate around the middle shaft 9 through the planetary gear shaft 11D, the planetary support 11A outputs the power to the output chain wheel assembly 13 through the planetary support external spline 11G, and the chain wheel 13B rotates to drive the bicycle to move forwards through a chain; in this case the transmission ratio i 1 ＝(1+Z b /Z a ) Wherein: z b Number of teeth of internal teeth 4A of gear ring, Z a The number of teeth of the sun gear 8; the speed-reducing moment-increasing transmission process is suitable for a rider to pedal on a flat road;
2) The first motor 12 is used as an input end, and the middle shaft 9 and the second motor 15 do not output power; the input power is transmitted to the inner gear ring 4 and the outer gear ring 4 through the first output shaft gear 12B and the secondary gear 3, the inner gear ring 4 and the outer gear ring 4 rotate, the planet gear 11B is meshed with the inner gear 4A of the gear ring, the sun gear 8 is clutched with the middle shaft 9 through the needle roller clutch 10, the planet gear 11B drives the planet support 11A to rotate around the middle shaft 9 through the planet gear shaft 11D, the planet support 11A outputs the power to the output chain wheel assembly 13 through the planet support external spline 11G, the chain wheel 13B rotates, and the bicycle is driven to move forwards through the chain; in this case the transmission ratio i 2 ＝(Z d /Z e )×(Z f /Z g )×(1+Z a /Z b ) Wherein: z d Number of teeth, Z, of external teeth 4B of ring gear e Number of teeth, Z, of the second-stage first gear 3A f Number of teeth of second gear 3B of two stages, Z g The number of teeth of the first output shaft gear 12B is the transmission process of speed reduction and torque increase, and the electric bicycle is suitable for a rider to electrically ride on a flat road and a climbing slope;
3) The second motor 15 is used as an input end, the middle shaft 9 and the first motor 12 do not output power, and the inner gear ring 4 and the outer gear ring 4 are fixed; the input power drives the planet support 11A to run around the middle shaft 9 through the second output shaft gear 15B, the sun gear 8 is clutched with the middle shaft 9 through the needle roller clutch 10, and the planet support 11A transmits the power through the planet support external spline 11GThe bicycle is output to the output chain wheel component 13, the chain wheel 13B rotates, and the bicycle is driven to move forwards through a chain; in this case the transmission ratio i 3 ＝Z h /Z i Wherein: z h Number of teeth, Z, of external gear 11F of planet carrier i The number of teeth of the second output shaft gear 15B; the electric bicycle is a transmission process of speed reduction and torque increase, and is suitable for a rider to electrically ride on a flat road and climb a slope;
4) The middle shaft 9 is used as an input end, the first motor 12 is used as an auxiliary input end, and the second motor 15 does not output power; the power input by the middle shaft 9 is transmitted to the sun gear 8 through the needle roller clutch 10 to drive the planetary gear 11B to operate, the planetary gear 11B drives the planetary support 11A to operate around the middle shaft 9 through the planetary gear shaft 11D, and the planetary support 11A outputs the power to the output chain wheel assembly 13 through the planetary support external spline 11G; meanwhile, the power is transmitted to the inner gear ring 4 and the outer gear ring 4 through the first output shaft gear 12B and the secondary gear 3, the inner gear ring 4 and the outer gear ring 4 rotate, the planetary gear 11B is meshed with inner teeth 4A of the gear rings, the planetary gear 11B drives the planetary support 11A to move around the central shaft 9 through the planetary gear shaft 11D, and the planetary support 11A outputs the power to the output chain wheel assembly 13 through the planetary support external spline 11G; the chain wheel 13B rotates along with the bicycle, and the bicycle is driven to move forwards through a chain; at this time, the output power is the sum of the power generated by the rider during pedaling and the power generated by the first motor 12, the two powers are in a linear change relationship, and the control unit 22 adjusts the power output by the first motor 12 according to the power change generated by the rider during pedaling so as to generate the stepless speed change output power during the riding process; the first motor 12 is used for assisting in outputting, and the speed change consistency, comfort and labor saving of the rider during power-assisted riding are ensured;
5) The middle shaft 9 is used as an input end, and the first motor 12 and the second motor 15 are used as auxiliary inputs; the power input by the middle shaft 9 is transmitted to the sun gear 8 through the needle roller clutch 10 to drive the planetary gear 11B to operate, the planetary gear 11B drives the planetary support 11A to operate around the middle shaft 9 through the planetary gear shaft 11D, and the planetary support 11A outputs the power to the output chain wheel assembly 13 through the planetary support external spline 11G; meanwhile, the power is transmitted to the inner gear ring 4 and the outer gear ring 4 through the first output shaft gear 12B and the secondary gear 3, the inner gear ring 4 and the outer gear ring 4 rotate, the planetary gear 11B is meshed with inner teeth 4A of the gear rings, the planetary gear 11B drives the planetary support 11A to move around the central shaft 9 through the planetary gear shaft 11D, and the planetary support 11A outputs the power to the output chain wheel assembly 13 through the planetary support external spline 11G; the power input by the second motor 15 drives the planet carrier 11A to run around the middle shaft 9 through the second output shaft gear 15B, and the planet carrier 11A outputs the power to the output chain wheel assembly 13 through the planet carrier external spline 11G; the chain wheel 13B rotates to drive the bicycle to move forward through a chain; at this time, the output power is the sum of the power generated by the foot-operated riding of the rider, the power generated by the first motor 12 and the power generated by the second motor 15, the three powers are in a linear change relationship, and according to the power change generated by the foot-operated riding of the rider, the control unit 22 adjusts the power output by the first motor 12 and the power output by the second motor 15, so as to generate the stepless speed change output power in the riding process; the bicycle is a transmission process for reducing speed and increasing torque, is suitable for riding on a flat road and climbing, particularly riding on a steep slope, and ensures the speed change continuity, comfort and labor saving of a rider during power-assisted riding.
Example 2
As shown in fig. 10, 11a and 11b, the present embodiment includes: the planetary gear mechanism 11 is coaxially arranged with the middle shaft 9, the planetary gear mechanism 11 is provided with a sun gear 8, an inner gear ring and an outer gear ring 4, a planet support 11A and a planetary gear 11B, the sun gear 8 is sleeved on the middle shaft 9 through a needle roller clutch 10, and the inner gear ring and the outer gear ring 4 are provided with inner gear ring teeth 4A and outer gear ring teeth 4B; the planet gears 11B are uniformly distributed on the planet support 11A in the circumferential direction, the planet gears 11B are duplicate gears, a first gear 11H in the duplicate gears is meshed with the sun gear 8, and a second gear 11J in the duplicate gears is meshed with the internal teeth 4A of the gear ring; the first motor 12 is meshed with the gear ring outer teeth 4B through a gear, one axial side of the planetary gear mechanism 11 is meshed with the second motor 15 through a gear, and the other axial side of the planetary gear mechanism is provided with an output chain wheel assembly 13 fixedly connected with the second motor; the output chain wheel assembly 13 is mounted on the planetary gear mechanism 11 through splines and is locked and positioned through a locking ring 14.
The middle shaft 9 is sleeved with a first end cover 1 through a bearing, the planetary gear mechanism 11 is sleeved with a second end cover 2 through a bearing, and the first end cover 1 and the second end cover 2 are connected to form a shell; the first motor 1, the second motor 2 and the planetary gear mechanism 11 are all arranged in the shell.
The first end cover 1 is provided with a support bearing of the inner gear ring 4 and the outer gear ring 4 at the inner side, and the first motor 12 and the second motor 15 are locked and fixed on the second end cover 2 through screws; the first motor 12 is provided with a first output shaft 12A, the first output shaft 12A is provided with a first output shaft gear 12B, and the first output shaft gear 12B is meshed with the gear ring external teeth 4B; the second motor 15 is provided with a second output shaft 15A, the second output shaft 15A is provided with a second output shaft gear 15B and a second output shaft gear clutch 15C, and the second output shaft gear 15B is sleeved on the second output shaft 15A through the second output shaft gear clutch 15C and fixed through a second positioning clamp spring 18.
The planetary gear mechanism 11 is sleeved on the middle shaft 9 through a supporting bearing; the planetary gear mechanism 11 is provided with a planet support excircle gear 11F which is meshed with a second output shaft gear 15B; planetary gear mechanism 11 be equipped with the planet gear axle 11D of axial equipartition, planet gear 11B establish on planet gear axle 11D through the support bearing cover and fix at axial positioning through first location jump ring 17.
When the embodiment works, the transmission is realized and the speed change is carried out through the following modes:
1) The middle shaft 9 is used as an input end, the first motor 12 and the second motor 15 do not output power, and the inner gear ring 4, the outer gear ring 4 and the first output shaft gear 12B are fixedly meshed; the input power is transmitted to the planetary gear 11B through the needle roller clutch 10 and the sun gear 8 to drive the planetary gear mechanism 11 to rotate around the middle shaft 9, and the output chain wheel assembly 13 rotates along with the rotation of the planetary gear mechanism to drive the electric bicycle to move forwards; at this time, the planetary gear mechanism 11 is engaged with the second output shaft gear 15B, and the second output shaft gear 15B is clutched with the second motor 15 through the second output shaft gear clutch 15C;
2) The first motor 12 is used as an input end, and the middle shaft 9 and the second motor 15 do not output power; the input power is transmitted to the planetary gear 11B through the first output shaft gear 12A and the inner and outer gear rings 4, the sun gear 8 is clutched with the middle shaft 9 through the needle roller clutch 10, the planetary gear mechanism 11 is driven by the planetary gear 11B to rotate around the middle shaft 9, and the output chain wheel assembly 13 rotates along with the rotation of the planetary gear mechanism to drive the electric bicycle to move forwards; at this time, the planetary gear mechanism 11 is engaged with the second output shaft gear 15B, and the second output shaft gear 15B is clutched with the second motor 15 through the second output shaft gear clutch 15C;
3) The second motor 15 is used as an input end, the middle shaft 9 and the first motor 12 do not output power, and the inner gear ring 4, the outer gear ring 4 and the first output shaft gear 12B are fixedly meshed; the input power is transmitted to the planetary gear mechanism 11 through the second output shaft gear clutch 15C and the second output shaft gear 15B, the planetary gear mechanism 11 rotates around the middle shaft 9, and the output chain wheel assembly 13 rotates along with the planetary gear mechanism to drive the electric bicycle to move forwards; at the moment, the sun gear 8 is clutched with the middle shaft 9 through the needle roller clutch 10;
4) The middle shaft 9 is used as an input end, the first motor 12 outputs power, and the second motor 15 does not output power; the power input by the middle shaft 9 is transmitted to the planetary gear 11B through the needle roller clutch 10 and the sun gear 8; the power input by the first motor 12 is transmitted to the planetary gear 11B through the first output shaft gear 12A and the inner and outer gear rings 4; the planetary gear mechanism 11 is driven by the planetary gear 11B to rotate around the central shaft 9, and the output chain wheel assembly 13 rotates along with the planetary gear mechanism to drive the electric bicycle to advance; at this time, the output power is the sum of the power generated by the rider during pedaling and the power generated by the first motor 12, the two powers are in a linear change relationship, and the control unit 22 adjusts the power output by the first motor 12 according to the power change generated by the rider during pedaling so as to generate the stepless speed change output power during the riding process; the speed-reducing moment-increasing transmission process is suitable for assisting a rider to ride on a flat road and on a climbing slope, and particularly in climbing riding, the first motor 12 assists in outputting, so that the speed change consistency, comfort and labor saving of the rider during assisting riding are ensured;
5) The middle shaft 9 is used as an input end, and the first motor 12 and the second motor 15 output power; the power input by the middle shaft 9 is transmitted to the planetary gear 11B through the needle roller clutch 10 and the sun gear 8; the power input by the first motor 12 is transmitted to the planetary gear 11B through the first output shaft gear 12A and the inner and outer gear rings 4; the power input by the second motor 15 is transmitted to the planetary gear mechanism 11 through the second output shaft gear clutch 15C and the second output shaft gear 15B; the planetary gear mechanism 11 rotates around the central shaft 9, and the output chain wheel assembly 13 rotates along with the planetary gear mechanism to drive the electric bicycle to advance; at this time, the output power is the sum of the power generated by the foot-operated riding of the rider, the power generated by the first motor 12 and the power generated by the second motor 15, the three powers are in a linear change relationship, and according to the power change generated by the foot-operated riding of the rider, the control unit 22 adjusts the power output by the first motor 12 and the power output by the second motor 15, so as to generate the stepless speed change output power in the riding process; the bicycle is a transmission process of reducing speed and increasing torque, is suitable for riding on a flat road and climbing, particularly riding on a steep slope, and ensures the speed change continuity, comfort and labor saving of a rider during power-assisted riding.
It is to be emphasized that: the transmission system in the above embodiments can be applied to variable speed transmission in other fields besides the field of bicycles; the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (8)
1. A stepless speed change transmission device of an electric bicycle is characterized by comprising a first motor, a second motor, a middle shaft and a planetary gear mechanism which is coaxially arranged with the middle shaft; the planetary gear mechanism comprises a sun gear, inner and outer gear rings, a planetary support and a planetary gear, wherein the sun gear is sleeved on the middle shaft through a clutch, the inner and outer gear rings are provided with inner gear ring teeth and outer gear ring teeth, the planetary gear is uniformly distributed on the planetary support in the circumferential direction and is respectively meshed with the sun gear and the inner gear ring teeth, the first motor is meshed with the outer gear ring teeth through a gear, one axial side of the planetary support is meshed with the second motor through the gear, and the other axial side of the planetary support is provided with an output gear disc assembly fixedly connected with the second motor;
the first motor is provided with a first output shaft, and a first output shaft gear is arranged on the first output shaft; the second motor is provided with a second output shaft, and a second output shaft gear is arranged on the second output shaft;
the planet support is provided with a planet support excircle gear, and the second output shaft gear is meshed with the planet support excircle gear.
2. The stepless speed change transmission device of the electric bicycle as claimed in claim 1, wherein the planet carrier is sleeved with an inner gear ring and an outer gear ring at one axial side through a bearing, the first output shaft gear is meshed with the outer teeth of the gear ring through a secondary gear, the secondary gear comprises a secondary first gear and a secondary second gear which are coaxially arranged, the secondary second gear is meshed with the first motor output shaft gear, and the secondary first gear is meshed with the outer teeth of the gear ring; correspondingly, the planetary gear is a single-stage gear.
3. The stepless speed change transmission device for the electric bicycle as claimed in claim 2, wherein the middle shaft is sleeved with a first end cover and a planet carrier through a bearing, and the planet carrier is sleeved with a main shell and a second end cover through a bearing; the first end cover is fixed on the main shell, the second end cover is fixed on the main shell, and the main shell is fixed on the frame.
4. The stepless speed change transmission device of the electric bicycle as claimed in claim 3, wherein a control unit is mounted on the main housing, and the control unit is respectively connected with the first motor and the second motor to control the power output.
5. The infinitely variable transmission of an electric bicycle according to claim 1, wherein the first output shaft gear is engaged with external teeth of the ring gear; correspondingly, the planet gear adopts a duplicate gear which comprises a first gear and a second gear which are coaxially arranged; the first gear is meshed with the sun gear, and the second gear is meshed with the inner teeth of the gear ring.
6. The stepless speed change transmission device of the electric bicycle as claimed in claim 5, wherein the middle shaft is sleeved with a first end cover through a bearing, the planetary gear mechanism is sleeved with a second end cover through a bearing, and the first end cover and the second end cover are connected to form a shell; the first motor, the second motor and the planetary gear mechanism are all arranged in the shell.
7. The stepless speed change transmission device for the electric bicycle as claimed in claim 6, wherein the first end cap is provided with a supporting bearing of the inner and outer gear rings at the inner side, and the first motor and the second motor are fixed on the second end cap.
8. The stepless speed change transmission device for the electric bicycle as claimed in claim 3 or 6, wherein the crank components are fixed at two ends of the middle shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710846046.9A CN107685828B (en) | 2017-09-19 | 2017-09-19 | Stepless speed change transmission device for electric bicycle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710846046.9A CN107685828B (en) | 2017-09-19 | 2017-09-19 | Stepless speed change transmission device for electric bicycle |
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| CN107685828A CN107685828A (en) | 2018-02-13 |
| CN107685828B true CN107685828B (en) | 2023-03-24 |
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| CN201710846046.9A Active CN107685828B (en) | 2017-09-19 | 2017-09-19 | Stepless speed change transmission device for electric bicycle |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108488334A (en) * | 2018-05-30 | 2018-09-04 | 唐山百盛机械设备有限公司 | A kind of double dynamical zero passage speed changer |
| CN110843995B (en) * | 2019-10-29 | 2023-07-21 | 东莞新富勤运动用品有限公司 | Shift assembly for bicycle |
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