CN209921540U - Electric bicycle moment measuring system based on strain gauge sensor - Google Patents

Abstract

The utility model discloses an electric bicycle moment measuring system based on a strain gauge sensor, which comprises a five-way main shaft, a sun gear component, a gear ring component and a planet carrier component; the combination of the sun wheel assembly, the gear ring assembly and the planet carrier assembly forms a planetary gear train taking the sun wheel assembly as the center; the utility model discloses a sun gear subassembly and torque sensor fixed connection, torque sensor detect the moment of torsion that the sun gear subassembly bore, and the sun gear subassembly is planetary gear train's central component, and the moment of torsion that this sun gear subassembly received comes from a plurality of planet wheels that are the even array of circumference, and then the moment of torsion that this sun gear subassembly bore is more steady for other positions, does not have the interference of moment of flexure power moreover, and the moment of torsion that detects this position is more accurate.

Description

Electric bicycle moment measuring system based on strain gauge sensor

Technical Field

The utility model belongs to the power-assisted bicycle field.

Background

On the electric power-assisted bicycle, the pedaling force of a rider is detected through a torque sensor, and then the output of a motor is controlled, so that the power-assisted effect is realized, for example, a strain gauge is pasted on a center shaft, an amplifying circuit is arranged and is connected with the outside through a slip ring and an electric brush, so that the strain gauge generates magnetic conduction change after being stressed, the inductance change of a coil group which is matched with the strain gauge and does not rotate with the strain gauge is caused, the inductance change or the coupling coefficient change is detected to be converted into corresponding electric quantity, and then corresponding torque is output; because the strain gauge is required to be installed on a rotating center shaft all the time, poor contact and unstable signal transmission are easy to occur in the connection mode of the slip ring and the electric brush, the center shaft in a rotating state has centrifugal force all the time, and in addition, in a bumpy road section, the strain gauge is easy to loosen and fall off, so that the phenomenon of inaccurate force measurement is caused.

Meanwhile, the five-way of the conventional power-assisted linear vehicle needs to be designed to be very long in order to realize the torque detection effect, so that the structure of the five-way middle shaft is unreasonable; and the existing strain gauge is attached to the outer wall of the main shaft, so that the elastic deformation on the outer wall of the main shaft is not large in the actual process, and the phenomenon of low detection precision is easily caused.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the not enough of existence among the prior art, the utility model provides an electric bicycle moment measuring system based on foil gage sensor that moment measuring is accurate, the reliability is high.

The technical scheme is as follows: in order to achieve the above object, the utility model discloses an electric bicycle moment of measurement system based on foil gage sensor, its characterized in that: the five-way spindle type planetary gear set comprises a five-way spindle, a sun gear assembly, a gear ring assembly and a planet carrier assembly; the combination of the sun wheel assembly, the gear ring assembly and the planet carrier assembly forms a planetary gear train taking the sun wheel assembly as the center;

the planet wheel support on the planet carrier assembly is in transmission connection with the five-way main shaft through a ratchet wheel, a pawl or a one-way bearing; the sun wheel assembly is fixedly connected with the torque sensor, and the torque sensor can detect the torque borne by the sun wheel assembly.

Furthermore, the sun wheel assembly comprises a sun wheel and a sensor fixing disc which are mutually and coaxially fixedly connected; the sun wheel is meshed with the planet wheels, and the inner ring of the sun wheel is in clearance fit with the outer wall of the five-way spindle; the torque sensor and the sensor fixing disc are detachably and fixedly installed.

Furthermore, the torque sensor comprises a connecting ring body, a plurality of flange holes are uniformly distributed on the connecting ring body in a circumferential array, and the flange holes are locked on locking holes at the end part of the sensor fixing disc through a plurality of flange locking bolts;

the outer side of the connecting ring body is integrally connected with a long rectangular force transmission arm, the length extension line of the force transmission arm passes through the circle center of the connecting ring body, one side of the middle part of the force transmission arm is pasted with a strain gauge, one side of the tail end of the force transmission arm, which is close to the strain gauge, is fixedly provided with a hemispheroid, and one side of the tail end of the force transmission arm, which is far away from the strain gauge, is integrally provided with a boss; the transmission arm is far away from one side of the strain gauge and is provided with a rectangular notch, and the rectangular notch is located at the middle position of the joint of the strain gauge, so that a local narrow section is formed at the middle position of the joint of the strain gauge.

Furthermore, the bicycle five-way box also comprises a bicycle five-way box body and a box body end cover; the box body end cover is locked on the box assembling end surface of the bicycle five-way box body through a plurality of end cover locking bolts; a sealing gasket is arranged between the bicycle five-way box body and the box body end cover; the combination of the bicycle five-way box body and the box body end cover forms a combined box body structure; the five-way main shaft, the sun wheel assembly, the gear ring assembly, the planet carrier assembly and the torque sensor are all positioned on the inner side of the box combining body structure; one end of the five-way main shaft is rotatably connected with a bearing hole on the bicycle five-way box body through a first bearing; a circular connecting ring body accommodating groove is formed in the inner side of the bicycle five-way box body, the connecting ring body accommodating groove and the bearing hole are coaxially arranged, and the inner diameter of the connecting ring body accommodating groove is larger than the outer diameter of the connecting ring body; the inner side of the bicycle five-way box body is also provided with a rectangular force transmission arm accommodating groove, and one end of the force transmission arm accommodating groove is communicated with the ring body accommodating groove; the groove width of the transmission arm accommodating groove is larger than the arm width of the transmission arm; two side walls of one end of the transmission arm accommodating groove, which is far away from the ring body accommodating groove, are respectively and integrally provided with a first hard boss and a second hard boss; an elastic rubber pad is fixedly bonded on the second hard boss; the connecting ring body and the force transmission arm are respectively arranged in the ring body accommodating groove and the force transmission arm accommodating groove, the boss on the force transmission arm elastically pushes against the elastic rubber pad, and the spherical surface of the hemisphere is in rigid contact with the end surface of the first hard boss.

The right end outer ring of the planet wheel support is rotationally connected with the left end inner ring of the outer gear through a sixth bearing; the right end inner ring of the outer gear is rotatably connected with the five-way main shaft through a seventh bearing, and the right end outer ring of the outer gear is rotatably connected with a bearing hole in the box body end cover through an eighth bearing.

Furthermore, the gear ring component comprises an inner gear ring cylinder body and an outer gear which are fixedly connected with each other coaxially; an inner ring is arranged on the inner ring of the inner ring gear barrel and is in meshed connection with a plurality of planet gears on the planet carrier assembly.

Further, the device also comprises a motor, and an output gear of the motor is in transmission engagement with the external gear.

Further, an external spline cylinder is fixedly connected with one side of the external gear, which is far away from the internal gear ring 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.

Further, the planet carrier subassembly includes planet wheel support and a plurality of planet wheel, and is a plurality of the planet wheel is all rotated and is installed on the planet wheel support, and is a plurality of the planet wheel is the circumference array along planet wheel support axis and distributes.

Further, the inner ring of the connecting ring body of the torque sensor is rotationally connected with the five-way spindle through a second bearing; the inner ring of the sensor fixing disc is rotationally connected with the five-way main shaft through a third bearing; the left end of the inner ring of the planet wheel support is rotationally connected with the outer ring of the sensor fixing disc through a fourth bearing; 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; a fifth bearing is further rotatably arranged on the left side of the ratchet pawl;

furthermore, a Hall magnetic steel ring is fixedly sleeved on the five-way main shaft and synchronously rotates along with the five-way main shaft, and the Hall magnetic steel ring is clamped between the first bearing and the inner ring of the second bearing; a Hall sensor is fixedly arranged at the left end of the connecting ring body; the Hall magnetic steel ring corresponds to the Hall sensor.

Has the advantages that: the utility model adopts the sun wheel component and the torque sensor to be fixedly connected, the torque sensor detects the torque born by the sun wheel component, the sun wheel component is the central component of the planetary gear train, the torque born by the sun wheel component comes from a plurality of planet gears which are in a circumference uniform array, and the torque born by the sun wheel component is more stable relative to other parts, and the interference of bending moment force is avoided, so that the torque detected at the position is more accurate; the torque born by the sun wheel is positively correlated with the pedaling force of a user, so that the torque born by the sun wheel can be used for judging the pedaling force of the user, the torque born by the sun wheel is converted into the bending moment of the static transmission arm by the torque sensor, the torque born by the sun wheel can be calculated by the strain gauge through detecting the strain on the transmission arm through the bending moment born by the transmission arm, the torque born by the sun wheel is further used for judging the pedaling force of the user, in order to simulate the power assisting effect of a bicycle, when the pedaling force is detected by the torque sensor to be larger, the situation that the user pedals the bicycle with force is indicated to be accelerated is shown, at the moment, the motor is controlled to improve the output power, the power transmitted by the output gear of the motor is increased, and the power assisting effect of the bicycle is further achieved.

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.

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 assembly 10, a gear ring assembly 13 and a planet carrier assembly 12; the combination of the sun wheel component 10, the gear ring component 13 and the planet carrier component 12 forms a planetary gear train taking the sun wheel 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 a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims (10)

1. The utility model provides an electric bicycle moment measuring system based on foil gage sensor which characterized in that: the five-way planetary gear transmission mechanism 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 wheel component (10), the gear ring component (13) and the planet carrier component (12) forms a planetary gear train taking the sun wheel component (10) as the center;

a planet wheel support (12.3) on the planet carrier assembly (12) is in transmission connection with the five-way spindle (11) through a ratchet wheel pawl (23) or a one-way bearing; the solar energy and wind power combined device is characterized by further comprising a fixedly-mounted torque sensor (9), the sun wheel assembly (10) is fixedly connected with the torque sensor (9), and the torque sensor (9) can detect torque borne by the sun wheel assembly (10).

2. The strain gage sensor-based torque measurement system for an electric bicycle according to claim 1, wherein: the sun wheel assembly (10) comprises a sun wheel (10.2) and a sensor fixing disc (10.3) which are coaxially and fixedly connected with each other; 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 spindle (11); the torque sensor (9) and the sensor fixing disc (10.3) are detachably and fixedly arranged.

3. The electric bicycle moment measuring system based on the strain gage sensor as claimed in claim 2, wherein: 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);

the outer side of the connecting ring body (9.7) is integrally connected with a long rectangular transmission arm (9.5), a length extension line of the transmission arm (9.5) passes through the circle center of the connecting ring body (9.7), one side of the middle of the transmission arm (9.5) is attached with a strain gauge (9.4), one side, close to the strain gauge (9.4), of the tail end of the transmission arm (9.5) is fixedly provided with a hemispheroid (9.2), and one side, far away from the strain gauge (9.4), of the tail end of the transmission arm (9.5) is integrally provided with a boss (9.1); keep away from transmission arm (9.5) foil gage (9.4) one side is provided with rectangle scarce groove (9.3), rectangle scarce groove (9.3) are located the middle part position of the laminating department of foil gage (9.4), make the middle part position of foil gage (9.4) laminating department form local narrow section (093).

4. The electric bicycle moment measuring system based on the strain gage sensor as claimed in claim 3, wherein: the bicycle five-way box body comprises a bicycle five-way box body (2) and a box body end cover (14); the box body end cover (14) is locked on the box closing end surface 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 bicycle five-way box body (2) and the box body end cover (14); 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 combining body 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), a boss (9.1) on the force transmission arm (9.5) is elastically pressed on 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 right end outer ring of the planet wheel support (12.3) is rotationally connected with the left end inner ring 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).

5. The electric bicycle moment measuring system based on the strain gage sensor as claimed in claim 4, wherein: the gear ring component (13) comprises an inner gear ring cylinder (13.2) and an outer gear (13.4) which are fixedly connected with each other coaxially; an inner ring (13.1) is arranged on an inner ring of the inner ring gear barrel (13.2), and the inner ring gear (13.1) is in meshed connection with a plurality of planet gears (12.2) on the planet carrier assembly (12).

6. The electric bicycle moment measuring system based on the strain gage sensor as claimed in claim 5, wherein: the motor is further included, and an output gear of the motor is in transmission meshing connection with the external gear (13.4).

7. The strain gage sensor-based torque measurement system for an electric bicycle according to claim 6, wherein: 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.

8. The strain gage sensor-based torque measurement system for an electric bicycle according to claim 7, wherein: planet carrier assembly (12) include planet wheel support (12.3) and a plurality of planet wheel (12.2), and is a plurality of planet wheel (12.2) are all rotated and are installed on planet wheel support (12.3), and are a plurality of planet wheel (12.2) are circumference array along planet wheel support (12.3) axis and distribute.

9. The strain gage sensor-based torque measurement system for an electric bicycle according to claim 8, wherein: the inner ring of a connecting ring body (9.7) of the torque sensor (9) 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 fixed 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); the left side of the ratchet pawl (23) is also rotatably provided with a fifth bearing (26).

10. The strain gage sensor-based torque measurement system for an electric bicycle according to claim 9, wherein: the five-way spindle (11) is further fixedly sleeved with a Hall magnetic steel ring (29), the Hall magnetic steel ring (29) synchronously rotates along with the five-way spindle (11), and the Hall magnetic steel ring (29) is clamped between the first bearing (3) and the inner ring of 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) and the Hall sensor (7) correspond to each other.

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