CN117002668A - Pedaling torsion sensing device of electric bicycle - Google Patents

Abstract

The pedal torque force sensing device of the electric bicycle is characterized in that a first external gear ring is combined in a shell and a second external gear ring is rotatably arranged, the second external gear ring is combined with a torsion element with a fixed tail end and a strain gauge on the surface, the first external gear ring and the second external gear ring are respectively meshed with a group of planet gears which are arranged on a planet carrier in a same way, a crankshaft is arranged between gears of the two groups of planet gears, the crankshaft is driven to the second external gear ring through one group of planet gears by the gears, and the other group of planet gears are linked to drive the output end of an output hollow tube to rotate; when the invention is used, the torsion sensor is arranged on the frame of the electric bicycle, and when the output end is connected with the fluted disc and has load, the torsion of the crankshaft can twist the torsion element, so that the strain gauge senses the torsion of the crankshaft which is trampled and rotated and is used as the basis of the output of electric auxiliary power.

Description

Pedaling torsion sensing device of electric bicycle

Technical Field

The present invention relates to a sensing device for a bicycle; and more particularly to a pedaling torque force sensing device for an electric bicycle.

Background

The existing electric bicycles are divided into electric bicycles with a central motor and electric bicycles with rear motors according to the positions of the motors. The electric bicycle with the motor in the middle is a bicycle with a motor transmission system arranged at the position of the bicycle frame corresponding to the five-way pipe, and the bicycle with the motor in the rear is a bicycle with a hub motor arranged at the axle center position of the rear wheel.

When the electric bicycle rides with motor auxiliary power, the auxiliary power output by the electric motor is determined by detecting the pedal torque. When detecting the pedal torque, a strain gauge is generally arranged on the fluted disc, the strain gauge senses the deformation of the fluted disc to obtain the torque of the pedal driving bicycle, but the position of the measured torque of the fluted disc is close to the tail end of the pedal power output transmission power, and the means for measuring the torque at the front end is lacking.

Disclosure of Invention

Therefore, the present invention is directed to a pedaling torque sensor for an electric bicycle, which senses the torque value of a crank shaft twisted by the pedal and provides a basis for the power auxiliary output of the electric bicycle.

The present invention provides a pedal torque sensor for an electric bicycle, comprising: a housing; a first external gear ring coupled within the housing; a torsion conductive assembly including a second external gear ring and a torsion member, wherein the second external gear ring is rotatably disposed in the housing, one end of the torsion member is coupled to the second external gear ring, and the other end of the torsion member is fixed relative to the housing; a strain gauge coupled to a surface of the torsion element; a planetary gear structure provided with a planetary carrier, wherein a plurality of first planetary gears are pivoted on the periphery of one side of the planetary carrier, a plurality of second planetary gears are pivoted on the periphery of the other side of the planetary carrier, the outer sides of the plurality of first planetary gears are meshed with the first outer gear ring, and the outer sides of the plurality of second planetary gears are meshed with the second outer gear ring; the transmission assembly comprises a crank shaft and an output hollow tube, the crank shaft penetrates through the torsion conduction sensing assembly and the center of the planetary gear structure, the crank shaft is provided with a driving sun gear, the driving sun gear is meshed with the inner sides of the plurality of second planetary gears, the output hollow tube is rotatably sleeved around the crank shaft, one end of the output hollow tube is provided with an output sun gear, the output sun gear is meshed with the inner sides of the plurality of first planetary gears, and the other end of the output hollow tube is provided with an output end for driving a fluted disc of the electric bicycle to rotate.

When the invention is used, the invention is arranged at the position of the frame of the electric bicycle corresponding to the five-way pipe, the crank and the pedal are combined at two ends of the crank shaft, and the output end of the output hollow pipe is connected with the fluted disc for driving the chain. When a rider of the electric bicycle steps on the two pedals to rotate the crank shaft, the driving sun gear drives the plurality of first planet gears to enable the planet carrier to rotate, the plurality of second planet gears are used for driving the output sun gear to enable the output hollow tube to rotate, and the output end drives the fluted disc and the chain to rotate.

The invention has the effects that when the driving sun gear of the crank shaft drives the plurality of first planet gears to rotate, the torsion force born by the second external gear ring which is limited by the torsion element and does not rotate is transmitted to the torsion element to enable the torsion element to be in torsion deformation, and the strain gauge arranged on the surface of the torsion element is enabled to measure the torsion value of the crank shaft which is driven by foot, so that the torque value can be used as a judging basis for controlling the auxiliary power output of the electric motor.

Drawings

Fig. 1 is a perspective view of a first preferred embodiment of the present invention.

Fig. 2 is a perspective view of a first preferred embodiment of the present invention with the drive assembly and the second end cap separated.

Fig. 3A is an exploded view of a first preferred embodiment of the present invention.

Fig. 3B is an exploded view of the first preferred embodiment of the present invention at another angle.

Fig. 4 is a cross-sectional view taken along the direction 4-4 of fig. 1.

Fig. 5 is a perspective view of a first preferred embodiment of the present invention disposed on a bypass center motor system.

Fig. 6 is a side view of a first preferred embodiment of the present invention disposed on a bypass center motor system.

Fig. 7 is a sectional view in the direction 7-7 of fig. 6.

Fig. 8 is a cross-sectional view taken along the direction 8-8 of fig. 6.

Fig. 9 is a perspective view of a second preferred embodiment of the present invention disposed on a coaxial center motor system.

Fig. 10 is a side view of a second preferred embodiment of the present invention disposed on a coaxial center motor system.

Fig. 11A is an exploded view of the disassembly motor mount of the in-line center motor system of fig. 9.

Fig. 11B is an exploded view of the coaxial center motor system of fig. 9 with the motor mount removed from the motor mount at another angle.

Fig. 12 is a sectional view taken along the direction 12-12 of fig. 10.

Detailed Description

In order to more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. Referring to fig. 1 to 4, a pedaling torque sensor device 100 according to a first preferred embodiment of the present invention is used for being mounted on an electric bicycle for measuring the pedaling torque of the electric bicycle, wherein the pedaling torque sensor device 100 comprises a housing 10, a first outer gear 20, a torque transmission assembly 30, a strain gauge a, a planetary gear structure 40 and a transmission assembly 50, wherein:

the housing 10 has an assembly space 12 inside, and in the preferred embodiment the assembly space 12 is a horizontally-disposed cylindrical space.

The first external gear ring 20 is a torus with a plurality of teeth surrounded by an inner circumferential surface, the first external gear ring 20 is disposed in the assembly space 12 and combined in the housing 10, the first external gear ring 20 is fixed against rotation relative to the housing 10, in some embodiments, the first external gear ring 20 is fixed to the housing 10 in a concave-convex jogged structure therebetween, in other embodiments, the first external gear ring 20 is directly formed into a structure integral with the housing 10, or both are bonded or welded to achieve the purpose of fixing the first external gear ring 20 in the housing 10.

The torque transmission assembly 30 includes a second external gear ring 32 and a torsion member 34, the second external gear ring 32 is a ring body with a plurality of teeth surrounded by an inner circumferential surface, the second external gear ring 32 is juxtaposed left and right with the first external gear ring 20 and is concentrically disposed in the assembly space 12, the second external gear ring 32 is rotatably disposed in the housing 10 in comparison with the first external gear ring 20 which does not rotate relative to the housing 10, and the number of teeth of the first external gear ring 20 and the second external gear ring 32 is the same; the torsion member 34 has two ends and one end coupled to the second ring gear 32 and the other end fixed against rotation relative to the housing 10. The strain gauge a is bonded to the surface of the torsion member 34, and the strain gauge a is preferably disposed at a position where the torsion member 34 is most significantly deformed, such as the surface of the middle portion of the torsion member 34.

The planetary gear structure 40 is provided with a planet carrier 42, the planet carrier 42 is a hollow circular tubular frame body and spans the inner sides of the first outer gear ring 20 and the second outer gear ring 32, the planet carrier 42 has two sides and the circumference of one side is pivoted with a plurality of first planet gears 44 in a surrounding and interval arrangement, the outer sides of the plurality of first planet gears 44 are engaged with the first outer gear ring 20, the circumference of the other side of the planet carrier 42 is pivoted with a plurality of second planet gears 46 in a surrounding and interval arrangement, the outer sides of the plurality of second planet gears 46 are engaged with the second outer gear ring 32, the plurality of first planet gears 44 and the plurality of second planet gears 46 are pivoted with the same planet carrier 42 in a rotating or non-rotating structure at the same time, and in the preferred embodiment, the plurality of first planet gears 44 and the plurality of second planet gears 46 are the same number and the individual first planet gears 44 are coaxially or concentrically arranged with the second planet gears 46 and have the same tooth number.

The transmission assembly 50 includes a crank shaft 52 and an output hollow tube 54, the middle portion of the crank shaft 52 passing through the center of the torque transmission assembly 30 and the planetary gear structure 40, specifically, the crank shaft 52 passing through the centers of the first and second ring gears 20 and 32 and the planet carrier 42 and between the plurality of first and second planet gears 44 and 46, the left and right ends of the crank shaft 52 passing out of the assembly space 12 of the housing 10. The crank shaft 52 has a driving sun gear 521, the driving sun gear 521 is fixed to the crank shaft 52 by spline structure, in other preferred embodiments the driving sun gear 521 may be integrally formed with the crank shaft 52; the drive sun gear 521 is meshed with the inner sides of the plurality of second planet gears 46.

The output hollow tube 54 is a tube body and is rotatably sleeved around the crank shaft 52, one end of the output hollow tube 54 extends into the assembly space 12 of the housing 10 and is provided with an output sun gear 541, the output sun gear 541 is meshed with the inner sides of the plurality of first planet gears 44, the other end of the output hollow tube 54 extending out of the housing 10 is provided with an output end 542, and the output end 542 is configured to drive a fluted disc of the electric bicycle to rotate; for example, in the preferred embodiment, the output end 542 is a one-way bearing seat and is surrounded by a one-way bearing 56, and the driving sun gear 521 and the output sun gear 541 are set to have the same number of teeth in order to make the rotational speed input by the crank shaft 52 equal to the rotational speed output by the hollow pipe 54, in response to the design that the first planetary gear 44 and the second planetary gear 46 have the same number of teeth and that the first external ring gear 20 and the second external ring gear 32 are set to have the same number of teeth.

In addition to the preferred embodiment, the first planetary gears 44 and the second planetary gears 46 are provided with the same number and number of teeth, the first external ring gear 20 and the second external ring gear 32 are provided with the same number of teeth, the output sun gear 541 and the driving sun gear 521 are provided with the same number of teeth, the first planetary gears 44 and the second planetary gears 46 may be provided with different numbers, for example, the number of three first planetary gears 44 and five second planetary gears 46 may be provided with the same or different axes or concentric/non-concentric arrangement of the respective first planetary gears 44 and second planetary gears 46, and the number of teeth of the same type of gears is not limited to the same, as long as the condition that the reduction ratio of the plurality of first planetary gears 44, the first external ring gear 20 and the output sun gear 541 and the reduction ratio of the plurality of second planetary gears 46, the second external ring gear 32 and the driving sun gear 521 are the same is satisfied, so that the rotational speed inputted from the crank shaft 52 may be equal to the rotational speed outputted from the hollow tube 54.

Referring to fig. 4 and 5-8, the pedaling torque sensor apparatus 100 according to the first preferred embodiment of the invention is installed in a side-by-side central motor system 200. The bypass type central motor system 200 is characterized in that a motor seat 70 is combined at a position of a bicycle frame 60 corresponding to a five-way pipe, an electric motor chamber 72 and a sensing device chamber 74 are respectively arranged at the front side and the rear side of the motor seat 70, the electric motor chamber 72 is provided with an electric motor 76, the electric motor 76 is provided with a controller for receiving data of the torque sensed by the strain gauge A in a signal manner, an output shaft of the electric motor 76 is connected with an electric output gear 762 through a speed reducing mechanism 761, and the power output by the electric motor 76 is in direct proportion to the torque sensed by the torsion element 34 by the strain gauge A.

The pedaling torque force sensing device 100 of the present invention is installed in the sensing device chamber 74, and both left and right ends of the crank shaft 52 extend out of the sensing device chamber 74 and are respectively combined with a crank 62, and the end of the crank 62 is combined with a pedal 621. The electric bicycle is provided with a fluted disc 64 between the crank 62 on the right side and the output end 542, the fluted disc 64 surrounds the crank shaft 52, the left side surface of the fluted disc 64 is concentrically combined with a circular outer bearing seat 641, the unidirectional bearing 56 is embedded and combined in the outer bearing seat 641, the outer circumferential surface of the outer bearing seat 641 forms a plurality of fluted disc driving teeth 642 in a surrounding manner, the electric motor 76 is connected with a speed reducing mechanism 761, the speed reducing mechanism 761 is transmitted to a unidirectional bearing 77, the outer ring of the unidirectional bearing 77 is combined with an electric output gear 762, the electric output gear 762 is meshed with the plurality of fluted disc driving teeth 642 on the surrounding side of the outer bearing seat 641, and under the situation that the electric output gear 762 is arranged on the outer ring of the unidirectional bearing 77, the electric motor 76 is not used for stepping, the rider is prevented from generating resistance due to hysteresis effect of the electric motor 76, and the rider is prevented from having to step on the situation that the rider is hard, and the experience is bad.

When the electric bicycle rider steps on the two pedals 621 to rotate the crank axle 52, the crank axle 52 and the driving sun gear 521 are driven to rotate, the driving sun gear 521 rotates the plurality of first planet gears 44 along the second external gear ring 32, the plurality of second planet gears 46 disposed on the same planet carrier 42 with the plurality of first planet gears 44 are driven to rotate with the plurality of first planet gears 44, so that the plurality of second planet gears 46 rotate along the first external gear ring 20 fixed relative to the housing 10, the output sun gear 541, the output hollow tube 54 and the output end 542 of the transmission assembly 50 are driven to rotate, and finally the one-way bearing 56 drives the fluted disc 64 to rotate through the external bearing seat 641.

In the process of treading the two pedals 621 to rotate the crank shaft 52 to drive the toothed disc 64 to rotate, since the reduction ratio of the first planetary gears 44, the first external gear ring 20 and the output sun gear 541 is the same as the reduction ratio of the second planetary gears 46, the second external gear ring 32 and the driving sun gear 521, the toothed disc 64 connected with the crank shaft 52 and the transmission assembly 50 rotates concentrically and at the same rotation speed and in the same direction, so that the setting of the electric bicycle when the two pedals 621 are treaded is consistent with that of the commercial bicycle, and the situation that the number of turns of the crank shaft 52 driven to rotate by the treading of the rider is inconsistent with that of the toothed disc 64 is avoided, and additional misunderstanding and bad impression are generated.

In the above-mentioned transmission process of stepping on the two pedals 621 to drive the toothed disc 64 by the pedaling torque sensing device 100, when the driving sun gear 521 of the crank shaft 52 drives the plurality of first planet gears 44 to rotate, the second outer gear ring 32 can rotate freely relative to the housing 10, but the second outer gear ring 32 has the torsion element 34 combined with the torsion element 34 fixed at the end thereof relative to the housing 10, so that the rotation of the second outer gear ring 32 is limited by the torsion element 34, and the torque of the plurality of first planet gears 44 driving the second outer gear ring 32 is transmitted to the torsion element 34, so that the torsion element 34 is deformed by the torque force, and the strain gauge a disposed on the surface of the torsion element 34 can sense and measure the torque value, so that the controller of the electric motor 76 determines whether the auxiliary power needs to be output.

When the controller of the electric motor 76 determines that the auxiliary power needs to be output, the electric output gear 762 is driven to drive the fluted disc 64 to rotate, and at this time, the fluted disc 64 can receive the power from the output hollow tube 54 for pedaling, and the auxiliary power of the electric motor 76 can be added, so that if the resistance increases when the rider of the electric bicycle steps on, that is, when the load of the crank shaft 52 and the output hollow tube 54 is lifted, the power output of the electric motor 76 can be increased through the torsion change measured by the strain gauge A, and the stepping on during riding is more labor-saving by the auxiliary power of the electric motor 76.

Further describing the construction of the pedaling torque sensor apparatus 100 according to the first preferred embodiment of the present invention, referring to fig. 1 to 4, the housing 10 has a tubular body 14, and the tubular body 14 has a plurality of first keyways 141 on the right side and a plurality of second keyways 142 on the left side. The tubular body 14 is screwed with a first end cover 16 adjacent to the right end of the first key slot 141, a first through hole 161 is formed in the middle of the first end cover 16, a first bearing 162 is embedded in the first end cover 16, the tubular body 14 is screwed with a second end cover 18 adjacent to the left end of the second key slot 142, a second through hole 181 is formed in the middle of the second end cover 18, the right end of the crank shaft 52 penetrates out of the first through hole 161, the left end of the crank shaft 52 penetrates out of the second through hole 181, and a right part of the crank shaft 52 penetrates into the first bearing 162.

The outer peripheral surface of the first outer gear 20 has a plurality of first key seats 22, the first key seats 22 are opposite to the first key grooves 141, and a first key block 24 is embedded in the first key seats 22, so that the first outer gear 20 is combined and fixed in the housing 10 and cannot rotate. And in other preferred embodiments, the housing 10 may be provided with only a first key slot 141 for engaging a first key seat 22 provided on the first external gear ring 20 and a first key block 24 embedded in both, and the first external gear ring 20 may be fixedly combined in the housing 10.

The torsion member 34 includes a connecting ring 341, a fixing ring 342, and a neck 343 connected between the connecting ring 341 and the fixing ring 342, the connecting ring 341 being concentrically coupled to the second outer ring gear 32 at a circumference. In the preferred embodiment, a transmission gear 3411 is provided around the connecting ring 341, the transmission gear 3411 is coaxial with the second external gear ring 32 and the transmission gear 3411 is engaged with the second external gear ring 32 in full circle; in other preferred embodiments the periphery of the connecting ring 341 may be connected to the end edge of the second outer ring gear 32, such that the second outer ring gear 32 and the torsion member 34 are of unitary construction.

The outer peripheral surface of the fixed ring 342 has a plurality of second key seats 3421, the second key seats 3421 are opposite to the second key grooves 142 and are embedded with a second key block 3422 therebetween, thereby the fixed ring 342 is combined in the housing 10 and is fixed and unable to rotate relative to the housing 10; and in other preferred embodiments, the housing 10 may be provided with only a second key slot 142 for engaging a second key seat 3421 provided in the fixing ring 342 and a second key block 3422 embedded in both, and the fixing ring 342 may be integrally fixed in the housing 10 so as not to rotate. The inner side of the fixed ring 342 is provided with a bearing block 3423, the bearing block 3423 is embedded with a second bearing 3424, and the left part of the crank shaft 52 is penetrated through the second bearing 3424. The neck 343 is a tube, one end of the neck 343 is connected to the inner circumference of the connection ring 341, the other end is connected to the inner circumference of the fixing ring 342, and the strain gauge a is coupled to the surface of the neck 343.

In addition to the first preferred embodiment, the pedaling torque sensor 100 is configured in the side-axle central motor system 200, as shown in fig. 9 to 12, and may also be configured in the coaxial central motor system 300.

The pedaling torque sensing apparatus 100 in the second preferred embodiment also comprises a housing 10, a first external gear 20, a torque transmitting assembly 30, a strain gauge a, a planetary gear configuration 40, and a transmission assembly 50. The first external gear ring 20 is combined in the casing 10 and cannot rotate, the torsion conductive assembly 30 comprises a second external gear ring 32 and a torsion element 34, the second external gear ring 32 is concentric with the first external gear ring 20 and juxtaposed left and right, the second external gear ring 32 is rotatably arranged in the casing 10, and the torsion element 34 has two ends and one end is combined with the second external gear ring 32, and the other end is fixed and not rotated relative to the casing 10. The strain gauge a is bonded to the surface of the torsion member 34 and the preferred bonding location is the surface of the middle portion of the torsion member 34.

The planetary gear structure 40 is provided with a planetary carrier 42, the planetary carrier 42 is a hollow circular tubular frame body and spans the inner sides of the first outer gear ring 20 and the second outer gear ring 32, the planetary carrier 42 is provided with two sides, the periphery of one side is pivoted with a plurality of first planetary gears 44 in a surrounding and interval arrangement mode, the outer sides of the plurality of first planetary gears 44 are meshed with the first outer gear ring 20, the periphery of the other side of the planetary carrier 42 is pivoted with a plurality of second planetary gears 46 in a surrounding and interval arrangement mode, and the outer sides of the plurality of second planetary gears 46 are meshed with the second outer gear ring 32.

The transmission assembly 50 includes a crank shaft 52 and an output hollow tube 54, the middle portion of the crank shaft 52 passing through the center of the torque transmission assembly 30 and the planetary gear structure 40, the left and right ends of the crank shaft 52 passing out of the housing 10, the crank shaft 52 having a driving sun gear 521, the driving sun gear 521 being meshed with the inner sides of the plurality of second planetary gears 46. The output hollow tube 54 is a tube body and partially penetrates the housing 10, the output hollow tube 54 is rotatably sleeved around the crank shaft 52, one end of the output hollow tube 54 has an output sun gear 541, the output sun gear 541 is meshed with the inner sides of the plurality of first planet gears 44, the other end of the output hollow tube 54 extending out of the housing 10 has an output end 542, and the output end 542 is configured to drive a fluted disc of the electric bicycle to rotate.

When the pedaling torque sensing apparatus 100 of the second preferred embodiment of the present invention is used, it is installed in the in-line type central motor system 300. The coaxial central motor system 300 has a motor seat 70, a mounting chamber 78 is provided in the motor seat 70, the pedaling torque force sensing device 100 is mounted and fixed in the mounting chamber 78, the left and right ends of the crank shaft 52 extend out of the mounting chamber 78 and are respectively combined with a crank 62, and the end of the crank 62 is combined with a pedal 621. A toothed disc 64 is provided between the right hand crank 62 and the output 542, the toothed disc 64 surrounding the crankshaft 52, the output 542 of the output hollow tube 54 being concentrically connected to the toothed disc 64.

The first external gear ring 20, the torque transmission assembly 30 and the planetary gear structure 40 are all mounted on the left side of the housing 10, the coaxial central motor system 300 is provided with an electric motor 76 in the middle of the housing 10, the electric motor 76 is provided with a controller for receiving the data of the torque sensed by the strain gauge a in a signal manner and comprises a stator 763 and a rotor 764, and a motor output shaft 765 is rotatably sleeved around the output hollow tube 54 in accordance with the position of the rotor 764. The stator 763 is circumferentially fixed around the inside of the housing 10, the rotor 764 is located inside the stator 763 and is combined with the motor output shaft 765, the right end of the motor output shaft 765 is connected with a speed reducing mechanism 761, the right end of the speed reducing mechanism 761 is provided with a speed reducing output end 766, the speed reducing output end 766 is concentrically connected with the fluted disc 64, and the power output by the electric motor 76 is directly proportional to the torque force born by the torsion element 34 sensed by the strain gauge a.

When the electric bicycle rider steps on the two pedals 621 to rotate the crank axle 52, the crank axle 52 and the driving sun gear 521 are driven to rotate, the rotation of the driving sun gear 521 drives the plurality of first planet gears 44 to rotate along the second external gear ring 32, the plurality of second planet gears 46, which are arranged on the same planet carrier 42 as the plurality of first planet gears 44, and the plurality of first planet gears 44 are driven to rotate along the first external gear ring 20 fixed relative to the housing 10, so that the output hollow tube 54 with the output sun gear 541 is driven to rotate, and finally the output end 542 drives the fluted disc 64 to rotate.

In the transmission process of the pedaling torque sensor 100 driving the toothed disc 64 by the two pedals 621, the second external gear ring 32 is limited by the torsion element 34 and cannot rotate freely, at this time, the torque of the first planetary gears 44 driving the second external gear ring 32 to rotate is transmitted to the torsion element 34, so that the torsion element 34 is deformed by the torque force, the strain gauge a disposed on the surface of the torsion element 34 measures the torque value, and the controller of the electric motor 76 determines whether the auxiliary power needs to be output. When the controller of the electric motor 76 determines that the auxiliary power needs to be output, the rotor 764 is driven to rotate the toothed disc 64 through the motor output shaft 765 and the speed reducing mechanism 761, and the toothed disc 64 may receive the power of stepping on the foot from the output hollow tube 54, and may also add the auxiliary power of the electric motor 76, so that stepping on the foot during riding is more labor-saving by the auxiliary power of the electric motor 76.

To further illustrate the construction of the pedaling torque force sensing apparatus 100 according to the second preferred embodiment of the present invention, please refer to fig. 9 to 12, the housing 10 is a circular and laterally disposed tube, the inner circumferential surface of the housing 10 has a plurality of lateral grooves 11, the lateral grooves 11 are long grooves extending in parallel to the axial direction of the crank shaft 52, an inner ring 13 having an inner diameter smaller than that of other portions of the housing 10 is formed at the left end of the housing 10, and the inner circumferential surface of the inner ring 13 has a plurality of clamping blocks 131; the outer circumferential surface of the first outer ring gear 20 has a plurality of protruding blocks 21, and the plurality of protruding blocks 21 are embedded in the plurality of transverse grooves 11, so that the first outer ring gear 20 is fixed and unable to rotate relative to the housing 10.

The torsion member 34 is identical to that described in the first preferred embodiment and includes a connecting ring 341, a securing ring 342, and a neck 343 connected between the connecting ring 341 and the securing ring 342. The connecting ring 341 has a driving gear 3411 around it, the driving gear 3411 is coaxial with the second outer gear ring 32 and the driving gear 3411 engages with the second outer gear ring 32 in a complete circle, the fixing ring 342 is located inside the inner ring 13 and has a plurality of recesses 3425 on the outer circumferential surface, the plurality of clamping blocks 131 are embedded in the plurality of recesses 3425, the fixing ring 342 is combined with the casing 10 to be unable to rotate, the neck 343 is a tube body, one end of the neck 343 is connected with the inner circumferential edge of the connecting ring 341, the other end of the neck 343 is connected with the inner circumferential edge of the fixing ring 342, and the strain gauge a is combined with the surface of the neck 343.

In addition to the above-mentioned configuration in which the plurality of lateral grooves 11 of the housing 10 are engaged with the plurality of protrusions 21 of the first external gear ring 20, only one lateral groove 11 may be engaged with the protrusions 21, so that the first external gear ring 20 is coupled to the housing 10 so as not to rotate. In addition, the engagement between the latch 131 of the housing 10 and the recess 3425 of the fixing ring 342 may be a concave-convex engagement between one latch 131 and one fixing ring 342, and the fixing ring 342 of the torsion element 34 may be fixed to the inner ring 13 of the housing 10.

The above description is only of the preferred embodiments of the present invention, and all equivalent changes in the specification and claims should be construed to be included in the scope of the present invention.

Description of the reference numerals

[ invention ]

100: pedal torque force sensing device

200: bypass type central motor system

300: coaxial central motor system

10: outer casing

11: transverse ditch

12: assembly space

13: inner ring

131: clamping block

14: tubular body

141: first key groove

142: second key groove

16: first end cap

161: first perforation

162: first bearing

18: second end cap

181: second perforation

20: first outer gear ring

21: bump block

22: first key seat

24: first key block

30: torsion conductive assembly

32: second external gear ring

34: torsion element

341: connecting ring

3411: transmission gear

342: fixing ring

3421: second key seat

3422: second key block

3423: bearing pedestal

3424: second bearing

3425: concave part

343: neck portion

40: planetary gear structure

42: planet carrier

44: first planetary gear

46: second planetary gear

50: transmission assembly

52: crank axle

521: driving sun gear

54: output hollow tube

541: output sun gear

542: an output terminal

56: unidirectional bearing

60: bicycle frame

62: crank arm

621: pedal plate

64: fluted disc

641: outer bearing seat

642: fluted disc driving tooth

70: motor seat

72: electric motor chamber

74: sensing device chamber

76: electric motor

761: speed reducing mechanism

762: electric output gear

763: stator

764: rotor

765: motor output shaft

766: deceleration output end

77: unidirectional bearing

78: mounting room

A: strain gauge

Claims (10)

1. A pedaling torque sensing apparatus of an electric bicycle, comprising:

a housing;

a first external gear ring coupled within the housing;

a torsion conductive assembly including a second external gear ring and a torsion member, wherein the second external gear ring is rotatably disposed in the housing, one end of the torsion member is coupled to the second external gear ring, and the other end of the torsion member is fixed relative to the housing;

a strain gauge coupled to a surface of the torsion element;

a planetary gear structure provided with a planetary carrier, wherein a plurality of first planetary gears are pivoted on the periphery of one side of the planetary carrier, a plurality of second planetary gears are pivoted on the periphery of the other side of the planetary carrier, the outer sides of the plurality of first planetary gears are meshed with the first outer gear ring, and the outer sides of the plurality of second planetary gears are meshed with the second outer gear ring; and

the transmission assembly comprises a crank shaft and an output hollow tube, the crank shaft penetrates through the torsion conduction sensing assembly and the center of the planetary gear structure, the crank shaft is provided with a driving sun gear, the driving sun gear is meshed with the inner sides of the plurality of second planetary gears, the output hollow tube is rotatably sleeved around the crank shaft, one end of the output hollow tube is provided with an output sun gear, the output sun gear is meshed with the inner sides of the plurality of first planetary gears, and the other end of the output hollow tube is provided with an output end for driving a fluted disc of the electric bicycle to rotate.

2. The pedaling torque sensing apparatus of an electric bicycle according to claim 1, wherein said torsion member comprises a connecting ring, a fixing ring and a neck portion connected between said connecting ring and said fixing ring, said connecting ring being concentrically coupled to said second external gear ring, said fixing ring being fixed with respect to said housing; the strain gauge is bonded to a surface of the neck.

3. The pedaling torque sensing apparatus of an electric bicycle according to claim 2, wherein a transmission gear is provided around said connection ring, said transmission gear being coaxial with said second external gear ring and said transmission gear engaging said second external gear ring throughout a full turn.

4. The pedaling torque sensing apparatus of an electric bicycle according to claim 3, wherein said neck is a tube and one end thereof is connected to an inner circumference of said connection ring and the other end thereof is connected to an inner circumference of said fixing ring, said fixing ring being incorporated in said housing.

5. The pedaling torque sensing apparatus of an electric bicycle according to claim 2, wherein said housing has a tubular body having at least one first key groove on one side of an inner circumferential surface thereof and at least one second key groove on the other side thereof, an outer circumferential surface of said first outer ring gear having at least one first key seat opposite to said first key groove and having a first key block embedded therein, and an outer circumferential surface of said fixing ring having at least one second key seat opposite to said second key groove and having a second key block embedded therein.

6. The pedaling torque sensing apparatus of an electric bicycle according to claim 5, wherein an end of said tubular body adjacent to said first keyway is threaded with a first end cap having a first through hole and embedded with a first bearing therein, said crank axle passing through said first through hole and being disposed through said first bearing; the tubular body is threaded with a second end cap adjacent the other end of the second keyway, the second end cap having a second bore through which the crank axle passes.

7. The pedaling torque sensing apparatus of an electric bicycle of claim 6, wherein an inner side of said fixing ring has a bearing seat, said bearing seat is embedded with a second bearing, and said crank axle is inserted through said second bearing.

8. The pedaling torque force sensing apparatus of an electric bicycle according to claim 2, wherein said housing is a tube body and has at least one lateral groove on an inner peripheral surface, said lateral groove being a long groove extending in a direction parallel to an axial direction of said crank shaft, an outer peripheral surface of said first outer ring gear having at least one protrusion, said protrusion being fitted in said lateral groove to be fixed; the end part of the fixing ring, which is matched with the shell, forms an inner ring with the inner diameter smaller than the inner diameter of other parts of the shell, the inner circumferential surface of the inner ring is provided with at least one clamping block, the outer circumferential surface of the fixing ring is provided with at least one concave part, and the clamping block is embedded into the concave part to fix the fixing ring.

9. The pedaling torque sensing apparatus of an electric bicycle of any one of claims 1-8, wherein said output end is a one-way bearing housing provided with a one-way bearing.

10. The pedaling torque sensing apparatus of an electric bicycle according to any one of claims 1 to 8, wherein a reduction ratio of the plurality of first planetary gears, the first external ring gear, and the output sun gear is the same as a reduction ratio of the plurality of second planetary gears, the second external ring gear, and the drive sun gear.