CN209833898U - Electric bicycle transmission system based on planetary gear train - Google Patents
Electric bicycle transmission system based on planetary gear train Download PDFInfo
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- CN209833898U CN209833898U CN201920436871.6U CN201920436871U CN209833898U CN 209833898 U CN209833898 U CN 209833898U CN 201920436871 U CN201920436871 U CN 201920436871U CN 209833898 U CN209833898 U CN 209833898U
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Abstract
The utility model discloses a utility model electric bicycle transmission system based on planetary gear train, which comprises a sun gear and a five-way main shaft which are fixedly installed; the sun wheel is sleeved outside the five-way main shaft, and the inner ring of the sun wheel is in clearance fit with the outer wall of the five-way main shaft; the planet wheel support is rotatably provided with a plurality of planet wheels, and the planet wheels are distributed along the axis of the planet wheel support in a circumferential array; the sun wheel is meshed with the planet wheels; the five-way transmission system has simple structure, adopts a planetary gear train structure, effectively reduces the axial size of the five-way position, has compact structure and can reduce the axial size of the five-way structure; but also has the advantages of small volume, small mass, large transmission power range, small operation noise, high efficiency, long service life and the like.
Description
Technical Field
The utility model belongs to the power-assisted bicycle field.
Background
In order to achieve a preset transmission ratio, the conventional transmission system of the power-assisted bicycle is large in axial length, so that equipment is overstaffed, the structure is not compact enough, and the transmission stability and the transmission efficiency are not high.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the deficiencies in the prior art, the utility model provides a compact structure, the high electric bicycle transmission system based on planetary gear train of transmission efficiency.
The technical scheme is as follows: in order to achieve the purpose, the utility model discloses an electric bicycle transmission system based on a planetary gear train, which comprises a sun gear and a five-way main shaft which are fixedly installed; the sun wheel is sleeved outside the five-way main shaft, and the inner ring of the sun wheel is in clearance fit with the outer wall of the five-way main shaft; the planet wheel support is rotatably provided with a plurality of planet wheels, and the planet wheels are distributed along the axis of the planet wheel support in a circumferential array; the sun wheel is meshed with the planet wheels; the inner ring of the planet wheel support is in transmission connection with the five-way spindle through a ratchet wheel and a pawl; the outer side of the planet wheel support also comprises an inner gear ring barrel, the inner ring of the inner gear ring barrel is provided with an inner gear ring, and the inner gear ring is in meshed connection with a plurality of planet wheels on the planet carrier assembly; the power device can drive the inner gear ring barrel to rotate.
Furthermore, the right end of the inner ring of the planet wheel support is in transmission connection with the five-way spindle through the ratchet wheel and the pawl; and a fifth bearing is further arranged on the left side of the ratchet wheel pawl in a rotating mode.
Furthermore, the outer ring of the right end of the planet wheel support is rotatably connected with the inner ring of the left end of the outer gear through a sixth bearing.
The inner ring at the right end of the outer gear is rotationally connected with the five-way main shaft through a seventh bearing; the power device comprises a motor, and an output gear of the motor is in transmission engagement with the outer gear; one side of the outer gear, which is far away from the inner gear ring cylinder body, is fixedly connected with an outer spline cylinder coaxially; the bicycle gearbox disc assembly is characterized by further comprising a bicycle gearbox disc assembly, and the outer spline cylinder is in transmission fit with the spline inner ring of the bicycle gearbox disc assembly through a spline.
Has the advantages that: the five-way transmission system has simple structure, adopts a planetary gear train structure, effectively reduces the axial size of the five-way position, has compact structure and can reduce the axial size of the five-way structure; but also has the advantages of small volume, small mass, large transmission power range, small operation noise, high efficiency, long service life and the like.
Drawings
FIG. 1 is an integral assembly of the present five-way transmission system;
FIG. 2 is a schematic illustration of the disassembly of the five-way transmission system;
FIG. 3 is an explosion diagram of a planetary gear train;
FIG. 4 is a schematic view of a torque sensor structure;
FIG. 5 is a partial schematic view of the inside of a bottom bracket of the bicycle without a torque sensor;
fig. 6 is a schematic diagram of a structure for placing a torque sensor on the basis of fig. 5.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Introduction of a transmission system of the scheme: comprises a sun gear 10.2 and a five-way main shaft 11 which are fixedly arranged; the sun gear 10.2 is sleeved outside the five-way main shaft 11, and the inner ring of the sun gear 10.2 is in clearance fit with the outer wall of the five-way main shaft 11; the planet wheel support 12.3 is provided with a plurality of planet wheels 12.2 in a rotating mode, and the planet wheels 12.2 are distributed in a circumferential array mode along the axis of the planet wheel support 12.3; the sun wheel 10.2 is meshed with each planet wheel 12.2; the inner ring of the planet wheel support 12.3 is in transmission connection with the five-way spindle 11 through a ratchet wheel and a pawl 23; the outer side of the planet wheel support 12.3 further comprises an inner gear ring cylinder 13.2, an inner gear ring 13.1 is arranged on the inner ring of the inner gear ring cylinder 13.2, and the inner gear ring 13.1 is in meshed connection with a plurality of planet wheels 12.2 on the planet carrier assembly 12; the power device can drive the inner gear ring barrel body 13.2 to rotate; the right end of the inner ring of the planet wheel support 12.3 is in transmission connection with the five-way spindle 11 through the ratchet wheel pawl 23; the left side of the ratchet pawl 23 is also rotatably provided with a fifth bearing 26. The outer ring of the right end of the planet wheel support 12.3 is rotationally connected with the inner ring of the left end of the outer gear 13.4 through a sixth bearing 28. The five-way spindle is characterized by further comprising an outer gear 13.4, the inner gear ring barrel 13.2 and the outer gear 13.4 are coaxially and fixedly connected with each other, and the inner ring at the right end of the outer gear 13.4 is rotatably connected with the five-way spindle 11 through a seventh bearing 30; the power device comprises a motor, and an output gear of the motor is in transmission engagement with the outer gear 13.4; one side of the outer gear 13.4, which is far away from the inner gear ring barrel 13.2, is coaxially and fixedly connected with an outer spline barrel 13.3; the bicycle gearbox disc assembly 16 is further included, and the external spline barrel 13.3 is in transmission fit with a spline inner ring 16.1 of the bicycle gearbox disc assembly 16 through a spline; the five-way transmission system adopts a planetary gear train structure, effectively reduces the axial size of the five-way position, has compact structure and can reduce the axial size of the five-way structure; but also has the advantages of small volume, small mass, large transmission power range, small operation noise, high efficiency, long service life and the like.
In order to more clearly illustrate the technical effect of the scheme and the working process of the transmission system, the whole system introduction after the torque detection mechanism is added on the basis of the transmission system of the scheme is as follows:
the electric bicycle moment measuring system based on the strain gauge sensor as shown in fig. 1 to 6 comprises a five-way main shaft 11, a sun gear component 10, a gear ring component 13 and a planet carrier component 12; the combination of the sun gear component 10, the gear ring component 13 and the planet carrier component 12 forms a planetary gear train taking the sun gear component 10 as the center; the planetary gear train has compact structure and can reduce the axial size of the five-way structure; but also has the advantages of small volume, small mass, large transmission power range, small operation noise, high efficiency, long service life and the like; the planet wheel carrier 12.3 on the planet carrier assembly member 12 of the embodiment is in transmission connection with the five-way spindle 11 through a ratchet pawl 23 or a one-way bearing; the two ends of the five-way main shaft 11 of the embodiment are used for connecting a pedal crankshaft, when the five-way main shaft 11 of the bicycle driven by pedals for a bicycle user rotates reversely, the ratchet pawl 23 enables the five-way main shaft 11 and the planet wheel support 12.3 to be mutually separated, and the ratchet pawl 23 effectively prevents the reverse rotation of the five-way main shaft 11 from driving the planet wheel support 12.3;
the sun wheel assembly 10 is fixedly connected with the moment sensor 9, the moment sensor 9 can detect torque borne by the sun wheel assembly 10, the sun wheel assembly 10 is a central component of a planetary gear train, the torque borne by the sun wheel assembly 10 is from a plurality of planetary gears 12.2 which are circumferentially and uniformly arrayed, and therefore the torque borne by the sun wheel assembly 10 is more stable relative to other parts, interference of bending moment force is avoided, and the torque at the position is detected more accurately; the sun wheel component 10 of the embodiment comprises a sun wheel 10.2 and a sensor fixing disc 10.3 which are fixedly connected with each other coaxially; the sun wheel 10.2 is meshed with the planet wheels 12.2, and the inner ring of the sun wheel 10.2 is in clearance fit with the outer wall of the five-way main shaft 11; the torque sensor 9 and the sensor fixing disc 10.3 are detachably and fixedly arranged.
The torque sensor 9 comprises a connecting ring body 9.7, a plurality of flange holes 96 are uniformly distributed on the connecting ring body 9.7 in a circumferential array, and the flange holes 96 are locked on locking holes 10.1 at the end part of the sensor fixing disc 10.3 through a plurality of flange locking bolts 8; fixation of the sun gear assembly 10 is achieved.
The outer side of the connecting ring body 9.7 is integrally connected with a long rectangular force transmission arm 9.5, the length extension line of the force transmission arm 9.5 passes through the circle center of the connecting ring body 9.7, a strain gauge 9.4 is attached to one side of the middle part of the force transmission arm 9.5, the force transmission arm 9.5 is slightly deformed by the bending moment to cause the change of the bridge resistance of the strain gauge 9.4, and the change of the strain bridge resistance is converted into the change of an electric signal to realize moment measurement; the torque sensor 9 converts the torque borne by the sun wheel assembly 10 into a bending moment of the static transmission arm 9.5, and then the strain gauge 9.4 can calculate the torque borne by the sun wheel assembly 10 through the bending moment borne by the transmission arm 9.5 by detecting the strain on the transmission arm 9.5;
a hemisphere 9.2 is fixedly arranged on one side, close to the strain gage 9.4, of the tail end of the force transmission arm 9.5, the hemisphere 9.2 is made of hard alloy, and a boss 9.1 is integrally arranged on one side, far away from the strain gage 9.4, of the tail end of the force transmission arm 9.5; a rectangular notch 9.3 is formed in one side, far away from the strain gauge 9.4, of the transmission arm 9.5, and the rectangular notch 9.3 is located in the middle of the joint of the strain gauge 9.4, so that a local narrow section 093 is formed in the middle of the joint of the strain gauge 9.4; the local narrow section 093 can form relatively large strain amount, so that the detection precision of the strain gauge 9.4 can be improved;
the bicycle five-way box body 2 and the box body end cover 14 are also included; the box body end cover 14 is locked on the box closing end face of the bicycle five-way box body 2 through a plurality of end cover locking bolts 17; a sealing gasket 5 is arranged between the five-way box body 2 and the box body end cover 14 of the bicycle of the embodiment; the combination of the bicycle five-way box body 2 and the box body end cover 14 forms a box body combining structure; the five-way main shaft 11, the sun gear component 10, the gear ring component 13, the planet carrier component 12 and the torque sensor 9 are all positioned on the inner side of the box combination structure; one end of the five-way main shaft 11 is rotatably connected with a bearing hole 4 on the bicycle five-way box body 2 through a first bearing 3; a circular connecting ring body accommodating groove 22 is formed in the inner side of the bicycle five-way box body 2, the connecting ring body accommodating groove 22 and the bearing hole 4 are coaxially arranged, and the inner diameter of the connecting ring body accommodating groove 22 is larger than the outer diameter of the connecting ring body 9.7; a rectangular force transmission arm accommodating groove 18 is further formed in the inner side of the bicycle five-way box body 2, and one end of the force transmission arm accommodating groove 18 is communicated with the ring body accommodating groove 22; the width of the force transmission arm accommodating groove 18 is larger than the arm width of the force transmission arm 9.5; a first hard boss 21 and a second hard boss 020 are respectively and integrally arranged on two side walls of one end, far away from the ring body accommodating groove 22, of the force transmission arm accommodating groove 18; an elastic rubber pad 20 is fixedly bonded on the second hard boss 020; the connecting ring body 9.7 and the force transmission arm 9.5 are respectively arranged in the ring body accommodating groove 22 and the force transmission arm accommodating groove 18, the boss 9.1 on the force transmission arm 9.5 is elastically pressed against the elastic rubber pad 20, and the spherical surface of the hemisphere 9.2 is in rigid contact with the end surface of the first hard boss 21; the elastic extrusion force on the elastic rubber pad 20 ensures that the spherical surface of the hemisphere 9.2 and the end surface of the first hard boss 21 are always in a rigid contact state; the contact part of the spherical surface of the hemisphere 9.2 and the end surface of the first hard boss 21 is a stress point at the tail end of the force transmission arm 9.5, the stress point is point contact, the position precision of the stress point is high, the moment length of the force transmission arm 9.5 is always in a constant state, and the torque detection precision is improved.
The outer ring at the right end of the planet wheel support 12.3 is rotationally connected with the inner ring at the left end of the outer gear 13.4 through a sixth bearing 28; the right end inner ring of the external gear 13.4 is rotatably connected with the five-way main shaft 11 through a seventh bearing 30, and the right end outer ring of the external gear 13.4 is rotatably connected with a bearing hole in the box body end cover 14 through an eighth bearing 27.
The gear ring component 13 comprises an inner gear ring barrel 13.2 and an outer gear 13.4 which are fixedly connected with each other coaxially; an inner ring of the inner ring gear barrel 13.2 is provided with an inner ring gear 13.1, and the inner ring gear 13.1 is in meshed connection with a plurality of planet gears 12.2 on the planet carrier component 12; the motor is further included, and an output gear of the motor is in transmission meshing connection with the outer gear 13.4.
One side of the outer gear 13.4, which is far away from the inner gear ring barrel 13.2, is coaxially and fixedly connected with an outer spline barrel 13.3; the bicycle gearbox disc assembly 16 is further included, and the external spline barrel 13.3 is in transmission fit with a spline inner ring 16.1 of the bicycle gearbox disc assembly 16 through a spline; planet carrier assembly 12 of this embodiment includes planet wheel carrier 12.3 and a plurality of planet wheel 12.2, and is a plurality of planet wheel 12.2 is all rotated and is installed on planet wheel carrier 12.3, and is a plurality of planet wheel 12.2 is the circumference array along planet wheel carrier 12.3 axis and distributes.
In addition, the inner ring of the connection ring body 9.7 of the torque sensor 9 of the embodiment is rotationally connected with the five-way main shaft 11 through a second bearing 24; the inner ring of the sensor fixing disc 10.3 is rotationally connected with the five-way spindle 11 through a third bearing 25; the left end of the inner ring of the planet wheel support 12.3 is rotationally connected with the outer ring of the sensor fixing disc 10.3 through a fourth bearing 31; the right end of the inner ring of the planet wheel support 12.3 is in transmission connection with the five-way spindle 11 through the ratchet wheel pawl 23; a fifth bearing 26 is further rotatably arranged on the left side of the ratchet pawl 23;
the five-way main shaft 11 is also fixedly sleeved with a Hall magnetic steel ring 29, the Hall magnetic steel ring 29 synchronously rotates along with the five-way main shaft 11, and the Hall magnetic steel ring 29 is clamped between the inner rings of the first bearing 3 and the second bearing 24; a Hall sensor 7 is fixedly arranged at the left end of the connecting ring body 9.7; the Hall magnetic steel ring 29 corresponds to the Hall sensor 7; the principle is that the peripheral magnetic field changes twice when the Hall magnet steel ring 29 rotates for one circle, so that the Hall potential in the Hall sensor 7 correspondingly changes with the same frequency, the output potential is amplified by the amplifying circuit, and the rotating speed of the rotating mechanism can be measured by the counting circuit; when the bicycle is in a downhill constant-speed state with higher speed, the Hall sensor 7 can identify that the rotating speed of the middle shaft is too high, so that the power-assisted state of the motor can be stopped, and the overspeed of the bicycle is effectively avoided.
The concrete transmission process of the scheme is as follows:
a user drives the five-way main shaft 11 to rotate by pedaling, at the moment, the rotation of the five-way main shaft 11 drives the whole planet wheel support 12.3 to rotate along the axis of the five-way main shaft 11 through the ratchet wheel pawl 23, under the transmission of a planet wheel system, the inner gear ring barrel 13.2 and the outer gear 13.4 start to rotate, so that the bicycle disc assembly 16 is driven to rotate, and the disc assembly 16 drives the rear wheel to rotate through a transmission chain; in the transmission process, the sun wheel 10.2 is still all the time, and the torque borne by the sun wheel 10.2 at the moment comes from a plurality of planet wheels 12.2 which are uniformly arrayed in the circumference; the torque born by the sun wheel 10.2 is positively correlated with the pedaling force of a user, so that the torque born by the sun wheel 10.2 can be used for judging the pedaling force of the user, the torque born by the sun wheel assembly 10 is converted into the bending moment of the static transmission arm 9.5 by the torque sensor 9, and then the strain gauge 9.4 can calculate the torque born by the sun wheel assembly 10 through the bending moment born by the transmission arm 9.5 by detecting the strain quantity on the transmission arm 9.5, so as to judge the pedaling force of the user.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. Electric bicycle transmission system based on planetary gear train, its characterized in that: comprises a sun gear (10.2) and a five-way main shaft (11) which are fixedly arranged; the sun gear (10.2) is sleeved on the outer side of the five-way main shaft (11), and the inner ring of the sun gear (10.2) is in clearance fit with the outer wall of the five-way main shaft (11); the planet wheel support (12.3) is provided with a plurality of planet wheels (12.2) in a rotating mode, and the planet wheels (12.2) are distributed in a circumferential array mode along the axis of the planet wheel support (12.3); the sun wheel (10.2) is meshed with each planet wheel (12.2); the inner ring of the planet wheel support (12.3) is in transmission connection with the five-way spindle (11) through a ratchet wheel and a pawl (23); the outer side of the planet wheel support (12.3) further comprises an inner gear ring cylinder (13.2), an inner gear ring (13.1) is arranged on the inner ring of the inner gear ring cylinder (13.2), and the inner gear ring (13.1) is in meshed connection with a plurality of planet wheels (12.2) on the planet wheel support (12); the power device can drive the inner gear ring barrel (13.2) to rotate.
2. The planetary gear train-based electric bicycle transmission system according to claim 1, wherein: the right end of the inner ring of the planet wheel support (12.3) is in transmission connection with the five-way spindle (11) through the ratchet wheel pawl (23); the left side of the ratchet pawl (23) is also rotatably provided with a fifth bearing (26).
3. The planetary gear train-based electric bicycle transmission system according to claim 1, wherein: the outer ring of the right end of the planet wheel support (12.3) is rotationally connected with the inner ring of the left end of the outer gear (13.4) through a sixth bearing (28).
4. The planetary gear train-based electric bicycle transmission system according to claim 2, wherein: the five-way spindle is characterized by further comprising an outer gear (13.4), the inner gear ring barrel (13.2) and the outer gear (13.4) are coaxially and fixedly connected, and the inner ring at the right end of the outer gear (13.4) is rotatably connected with the five-way spindle (11) through a seventh bearing (30); the power device comprises a motor, and an output gear of the motor is in transmission engagement with the outer gear (13.4); one side of the outer gear (13.4) far away from the inner gear ring cylinder body (13.2) is coaxially and fixedly connected with an outer spline cylinder (13.3); the bicycle disc assembly is characterized by further comprising a bicycle disc assembly (16), and the outer spline cylinder (13.3) is in transmission fit with a spline inner ring (16.1) of the bicycle disc assembly (16) through a spline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920436871.6U CN209833898U (en) | 2019-04-02 | 2019-04-02 | Electric bicycle transmission system based on planetary gear train |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920436871.6U CN209833898U (en) | 2019-04-02 | 2019-04-02 | Electric bicycle transmission system based on planetary gear train |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209833898U true CN209833898U (en) | 2019-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920436871.6U Active CN209833898U (en) | 2019-04-02 | 2019-04-02 | Electric bicycle transmission system based on planetary gear train |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209833898U (en) |
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2019
- 2019-04-02 CN CN201920436871.6U patent/CN209833898U/en active Active
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