Sensor structure for a chainless bicycle

Abstract

Sensor structure of chainless transmission bicycle, five pass body is equipped with pedal axle, pedal axle is connected with spline sleeve, spline sleeve is equipped with five pass gear, the peripheral wall of spline sleeve is attached with strain gauge, the protection shell is inserted with circuit board female card sleeve, the inductor female circuit board is clamped between the circuit board female card sleeve and the protection shell, the pedal axle is equipped with circuit board male card sleeve, the inductor male circuit board is connected with the inductor male circuit board, the inductor male circuit board is connected with the magnet tooth ring, the inductor female circuit board is connected with the number of teeth inductor, the invariable signal data control electric power is obtained by adding torsion sensor mechanism and speed sensor mechanism in the axle transmission structure, the ratio control of the power of pedaling and electric power is realized, the goal of energy saving and prolonging the endurance is achieved, the riding comfort is improved, the torsion sensor mechanism can accurately sense the data signal of pedal torsion, the uphill effort can effectively supplement the driving energy, and the downhill is easy to supplement the driving energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power-assisted bicycles, more particularly to a sensor structure of a chainless drive bicycle. BACKGROUND

[0002] An electric power-assisted bicycle is a personal transportation tool that has the lightness and convenience of a power-assisted bicycle and can effectively alleviate the burden of the power-assisted bicycle when climbing uphill, against the wind, and carrying objects. The control technology of the electric power-assisted bicycle is closely related to the riding experience of the rider, so the control technology of the electric power-assisted bicycle has research and use value.

[0003] Most of the existing control technologies of electric power-assisted bicycles collect the torque value generated by the human pedaling through a rear hook claw sensor to realize the power output control of the driving device. However, the rear hook claw sensor is arranged at the rear end of the power-assisted bicycle, and the force of the human pedaling needs to be transmitted to the sensor through the crank, chain wheel and chain, so that too many links are involved, resulting in inaccurate sensing torque value and delayed testing, which leads to poor control accuracy and slow response speed of the power output of the driving device of the power-assisted bicycle, and reduces the riding experience of the rider.

[0004] The Chinese patent publication: a control method and system of a power-assisted bicycle, publication number: CN109421883, proposes to use the resistance value change of the strain gauge during the force receiving process of the pedal of the power-assisted bicycle to return a signal to the controller, so as to control the output of the power of the power-assisted bicycle. However, this method cannot accurately monitor the actual resistance of the wheel by monitoring the force receiving condition of the pedal, so the monitoring is not accurate. SUMMARY

[0005] The present application improves the prior art in view of the above-mentioned shortcomings, and provides a sensor structure of a chainless drive bicycle, and the technical scheme is as follows:

[0006] The sensor structure of a chainless bicycle includes a bottom bracket body 1, with a pedal axle 2 passing through the middle of the bottom bracket body 1. The pedal axle 2 is connected to a spline sleeve 4 via spline teeth 3. A bottom bracket gear 5 is fitted onto one end of the spline sleeve 4. The bottom bracket gear 5 and the spline sleeve 4 are connected via a spline sleeve ratchet 6. Strain gauges 7 are attached to the peripheral wall of the spline sleeve 4, and a protective shell 8 is fitted onto its outer side. A support bearing 9 is installed between one end of the protective shell 8 and the spline sleeve 4. The protective shell 8 is located in phase with the support bearing 9. A circuit board female sleeve 10 is inserted into one end of the pedal. A sensor female circuit board 11 is sandwiched between the circuit board female sleeve 10 and the protective shell 8. A circuit board male sleeve 12 is inserted between the sensor female circuit board 11 and the spline sleeve 4. A sensor male circuit board 13 is connected to one side of the circuit board male sleeve 12. A magnetic toothed ring 14 is connected to the sensor male circuit board 13 on one side of the sensor female circuit board 11. A tooth count sensor 15 is connected to the sensor female circuit board 11 corresponding to the magnetic toothed ring 14.

[0007] The bottom bracket body 1 includes a bottom bracket sleeve 16 and an end cap 17 connected to one end of the bottom bracket sleeve 16. A sealing ring 18 is connected between the bottom bracket sleeve 16 and the pedal axle 2, and between the end cap 17 and the pedal axle 2.

[0008] Furthermore, a movable bearing 20 is installed between the foot pedal central shaft 2 and the bottom bracket sleeve 16.

[0009] The inner side of the five-way gear 5 is provided with a five-way tooth internal ratchet 19, which meshes with the spline sleeve ratchet 6 through the five-way tooth internal ratchet 19, so that the five-way gear 5 and the spline sleeve 4 cooperate for transmission. The spline sleeve 4 and the foot pedal shaft 2 and the five-way gear 5 and the end cover 17 are both provided with movable bearings 20.

[0010] An oil seal ring 24 is installed between the spline sleeve 4 and the protective shell 8 at one end of the support bearing 9.

[0011] Furthermore, the foot pedal central shaft 2 is equipped with a buckle 25 at the movable bearing 20 to limit the movable bearing.

[0012] The circuit board mother sleeve 10 has a stepped structure, with its inner side connected to the outer periphery and having a wire outlet hole 21.

[0013] The circuit board mother sleeve 10 is located at the opposite end of the sensor mother circuit board 11 and is provided with a sealing ring 18 and a cover 22 in sequence from the inside to the outside.

[0014] The foot pedal central shaft 2 is located at one end of the circuit board female sleeve 10 and is fastened with a limiting buckle 23 to prevent the circuit board female sleeve 10 from moving.

[0015] The inductor female circuit board 11 and the inductor male circuit board 13 are both Hall inductors.

[0016] Compared with the prior art, the application has the beneficial effects that: the application adds a torsion sensor mechanism and a speed sensor mechanism in the middle shaft transmission structure to obtain variable signal data to control electric power assistance, realizes proportional control of the pedaling force and the electric power assistance, achieves the goal of energy saving and prolonging the endurance, improves the riding comfort, and makes the torsion sensor mechanism can accurately sense the data signal of the pedal torsion force, effectively supplements the driving energy when uphill, and reduces the driving energy when downhill. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced as follows:

[0018] Figure 1 is a perspective view of the application;

[0019] Figure 2 is a left view of the application;

[0020] Figure 3 is an A-A sectional view of Figure 2 ; is a partial enlarged view of

[0021] Figure 4 is a partial enlarged view of Figure 3 ; is an internal structure view of the speed sensor mechanism;

[0022] Figure 5 ; is an exploded structure view of the application;

[0023] Figure 6 ; is an exploded structure view of the application;

[0024] Comprise: 1, five-way body; 2, pedal middle shaft; 3, spline tooth; 4, spline sleeve; 5, five-way gear; 6, spline sleeve ratchet; 7, strain gauge; 8, protective shell; 9, support bearing; 10, female card sleeve of circuit board; 11, inductor female circuit board; 12, male card sleeve of circuit board; 13, inductor male circuit board; 14, magnet tooth ring; 15, tooth number inductor; 16, five-way outer sleeve; 17, end cover; 18, sealing ring; 19, five-way tooth inner ratchet; 20, movable bearing; 21, wire hole; 22, cover; 23, limit buckle; 24, oil seal ring; 25, buckle. IMPLEMENTATION

[0025] With reference to the accompanying drawings: the technical solutions in the embodiments of the present application will be apparently and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0026] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings, and the details are as follows:

[0027] The sensor structure of the chainless drive bicycle comprises a five-way body 1, a pedal middle shaft 2 is arranged in the middle of the five-way body 1, the pedal middle shaft 2 is connected with a spline sleeve 4 through spline teeth 3, one end of the spline sleeve 4 is sleeved with a five-way gear 5, the five-way gear 5 is connected with the spline sleeve 4 through spline sleeve ratchet teeth 6, the peripheral wall of the spline sleeve 4 is attached with a strain gauge 7, an outer protective shell 8 is sleeved, a support bearing 9 is arranged between one end of the protective shell 8 and the spline sleeve 4, a circuit board female adapter sleeve 10 is inserted into the end of the protective shell 8 opposite to the support bearing 9, a sensor female circuit board 11 is clamped between the circuit board female adapter sleeve 10 and the protective shell 8, a circuit board male adapter sleeve 12 is arranged between the pedal middle shaft 2 and the spline sleeve 4, a sensor male circuit board 13 is connected to one side of the circuit board male adapter sleeve 12, a magnet tooth ring 14 is connected to one side of the sensor female circuit board 11, and a tooth number sensor 15 is connected to the sensor female circuit board 11 corresponding to the magnet tooth ring 14.

[0028] When the pedal is pedaled, the pedal middle shaft 2, the circuit board male adapter sleeve 12, the sensor male circuit board 13, the magnet tooth ring 14, the spline sleeve 4, the spline teeth 3, the limiting buckle 23 and the strain gauge 7 rotate, the torque sensor mechanism senses the pedal torque, when the pedal applies force to the pedal middle shaft 2, the pedal middle shaft 2 transmits power to the spline sleeve 4 through the spline combination of the spline teeth 3 and the spline sleeve 4, a spline sleeve ratchet tooth 6 is installed at the right end of the spline sleeve 4, and the power drives the five-way gear 5 to rotate through the five-way tooth inner ratchet meshing of the spline sleeve ratchet tooth 6 and the five-way gear 5. The five-way gear 5 outputs power to the rear wheel (not shown in the figure) through two groups of bevel gears. The outer circle of the spline sleeve 4 is attached with a strain gauge 7, when the spline sleeve 4 is subjected to force, it will produce extremely small torque deformation on the strain gauge 7, through the small deformation signal of the strain gauge 7, a signal collector for collecting the small deformation signal of the strain gauge 7 is installed at the left end of the spline sleeve 4, and the torque size during pedaling can be obtained through operation, so as to control the torque output of the driving motor through the torque size signal (the spline sleeve 4 has a certain deformation ability, it is a steel part, and the spline sleeve 4 is in a rotating state when pedaling.

[0029] Speed ​​sensor mechanism: When the pedal is pressed, the pedal shaft 2 rotates on the pedal shaft 2. The circuit board male sleeve 12 rotates, and the sensor male circuit board 13 moves with it. The magnetic tooth ring 14 moves with it. The sensor female circuit board 11 is fixed in the protective shell 8 by the circuit board female sleeve 10 and does not rotate. The rotation of the magnetic tooth ring 14 and the tooth count sensor 15 mutually detect the number of teeth. The tooth count sensor 15 senses the magnetic tooth ring 14 to obtain a signal. This invention is to detect the number of magnetic teeth and output a signal to control the speed.

[0030] The bottom bracket body 1 includes a bottom bracket sleeve 16 and an end cap 17 connected to one end of the bottom bracket sleeve 16. A sealing ring 18 is connected between the bottom bracket sleeve 16 and the pedal shaft 2, and between the end cap 17 and the pedal shaft 2. A movable bearing 20 is installed between the pedal shaft 2 and the bottom bracket sleeve 16.

[0031] The inner side of the five-way gear 5 is provided with a five-way tooth internal ratchet 19, which meshes with the spline sleeve ratchet 6 through the five-way tooth internal ratchet 19, so that the five-way gear 5 and the spline sleeve 4 cooperate for transmission. Movable bearings 20 are provided between the spline sleeve 4 and the foot pedal shaft 2, and between the five-way gear 5 and the end cover 17. An oil seal ring 24 is installed at one end of the support bearing 9 between the spline sleeve 4 and the protective shell 8. A buckle 25 is installed at the movable bearing 20 of the foot pedal shaft 2 to limit the movable bearing. The foot pedal shaft 2 is located at one end of the circuit board female retainer 10. The end is fastened with a limiting buckle 23 to prevent the female circuit board sleeve 10 from moving. The limiting buckle 23 is rigid and has high strength to hold the cover 22. There is also a limiting buckle on the left side. The buckle 25 is pushed into the foot pedal shaft 2 to limit the movable bearing 20. The oil seal ring 24 is fitted inside the protective shell 8 to seal the area from the left outer side of the spline sleeve 4 to the inner cavity of the protective shell 8. It protects against corrosion of electronic components, including the strain gauge 7. The limiting buckle 23 limits the male circuit board sleeve 12 and has an oil-proof function. The male circuit board sleeve 12 itself has the function of preventing oil leakage to the left.

[0032] The circuit board mother sleeve 10 has a stepped structure, with its inner side connected to the outer periphery and having a wire outlet hole 21. The circuit board mother sleeve 10 is located at the opposite end of the sensor mother circuit board 11 and is provided with a sealing ring 18 and a cover 22 from the inside to the outside.

[0033] Both the mother circuit board 11 and the male circuit board 13 of the sensor use Hall effect sensors.

[0034] This invention acquires variable signal data to control electric assist by adding a torque sensor mechanism and a speed sensor mechanism to the central shaft transmission structure. This achieves proportional control of pedaling force and electric assist, thereby achieving the goal of energy saving and extending range, improving riding comfort, and enabling the torque sensor mechanism to accurately sense the data signal of pedaling torque. When riding uphill, it can effectively supplement more driving energy, and when riding downhill, it can easily supplement less driving energy.

[0035] Torque transmission shaft principle: electric power-assisted bicycle chain-free torque transmission shaft, the main components inside are composed of shaft, shaft sleeve, gear, sensor, signal wireless transmission and torque signal processing circuit. The torque signal collected on the shaft sleeve and the power supply use double coil wireless power supply and wireless transmission torque signal, electromagnetic coupling resonance type wireless transmission mode, so that the dynamic torque signal of the middle shaft becomes the static torque signal outside the middle shaft, which is convenient for wired transmission and processing. When riding, human power is transmitted to the middle shaft through the crank, the spline on the middle shaft is connected with the shaft sleeve, the shaft sleeve is connected with the gear through the spline, the gear transmits human power to the rear wheel of the bicycle, and the sensor installed on the shaft sleeve generates corresponding torque electric signal. The torque signal is processed by a microcomputer and transmitted to the receiving circuit outside the middle shaft through wireless transmission. The receiving circuit processes the signal and outputs it to the motor controller to control the size of the motor output power, realize the proportional control of the pedaling force and electric power-assisted force, achieve the goal of energy saving and prolonging the endurance, and improve the riding comfort.

[0036] Among them: the working principle of torque sensor is that the sensor can sense the physical change of torque and convert it into a signal that can be output and understood, so as to measure the size of torque. Its components are roughly: magnetic detector, torsion shaft, shell and drum. Torque sensor uses phase difference concept, magneto-electric conversion principle and digital display measurement method in the working process. The excellent installation position of torque sensor makes it have excellent bearing capacity, whether it is for bearing pressure or measuring torque, it has outstanding effect. When the middle shaft is subjected to force, it will produce very fine torsional deformation, and by measuring some fine deformation signals on the surface of the middle shaft, the torque size when pedaling can be obtained, so the measurement accuracy is very high.

[0037] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and deformations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. Sensor structure of a chainless bicycle, comprising a five-way body (1) having a pedal shaft (2) passing through the middle part of said five-way body (1), characterized in that, The pedal shaft (2) is connected with a spline sleeve (4) through spline teeth (3), one end of the spline sleeve (4) is sleeved with a five-way gear (5), the five-way gear (5) and the spline sleeve (4) are connected through spline sleeve ratchet teeth (6), the peripheral wall of the spline sleeve (4) is attached with a strain gauge (7), the outside is sleeved with a protective shell (8), and a support bearing (9) is arranged between one end of the protective shell (8) and the spline sleeve (4), a circuit board female card sleeve (10) is inserted into the opposite end of the support bearing (9) of the protective shell (8), a sensor female circuit board (11) is clamped between the circuit board female card sleeve (10) and the protective shell (8), a circuit board male card sleeve (12) is arranged between the pedal shaft (2) and the spline sleeve (4), one side of the circuit board male card sleeve (12) is connected with a sensor male circuit board (13), the sensor male circuit board (13) on one side of the sensor female circuit board (11) is connected with a magnet tooth ring (14), the sensor female circuit board (11) is connected with a tooth number sensor (15) corresponding to the magnet tooth ring (14), and the pedal shaft (2) is buckled at one end of the circuit board female card sleeve (10) to prevent the circuit board female card sleeve (10) from moving.

2. The sensor structure of a chainless bicycle according to claim 1, characterized in that, The five-way body (1) comprises a five-way outer sleeve (16) and an end cover (17) connected to one end of the five-way outer sleeve (16), and a sealing ring (18) is arranged between the five-way outer sleeve (16) and the pedal shaft (2) and between the end cover (17) and the pedal shaft (2).

3. The sensor structure of a chainless bicycle according to claim 2, characterized in that, The pedal shaft (2) and the five-way outer sleeve (16) are provided with a movable bearing (20).

4. The sensor structure of a chainless bicycle according to claim 1, characterized in that, The inner side of the five-way gear (5) is provided with five-way tooth inner ratchet (19), and the five-way tooth inner ratchet (19) is engaged with the spline sleeve ratchet teeth (6), so that the five-way gear (5) and the spline sleeve (4) are cooperatively driven, and movable bearings (20) are arranged between the spline sleeve (4) and the pedal shaft (2) and between the five-way gear (5) and the end cover (17).

5. The sensor structure of a chainless bicycle according to claim 1 or 4, characterized in that, An oil seal ring (24) is arranged at one end of the support bearing (9) between the spline sleeve (4) and the protective shell (8).

6. The sensor structure of a chainless bicycle according to claim 4, characterized in that, A buckle (25) is arranged at the movable bearing (20) of the pedal shaft (2) to limit the movable bearing.

7. The sensor structure of a chainless bicycle according to claim 1, characterized in that, The circuit board female card sleeve (10) is a stepped structure, and a wire outlet hole (21) is formed in the inner side and the outer periphery in communication.

8. The sensor structure of a chainless bicycle according to claim 1 or 7, characterized in that, From inside to outside, a sealing ring (18) and a cover (22) are arranged in sequence at the opposite end of the sensor female circuit board (11) of the circuit board female card sleeve (10).

9. The sensor structure of a chainless bicycle according to claim 1, characterized in that, The sensor female circuit board (11) and the sensor male circuit board (13) both adopt a Hall sensor.

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