Bicycle driving system and sensing ratchet wheel set thereof

Abstract

The invention provides a driving system of a bicycle. The driving system comprises a fluted disc, a chain, a flywheel and a sensing ratchet wheel set. And the flywheel is synchronously linked with the fluted disc through a chain. The sensing ratchet group is connected to the flywheel. The sensing ratchet wheel set comprises a ratchet wheel seat, a ratchet wheel shell, a bottom cover and a whole vehicle rotating speed sensor. The ratchet shell is rotatably arranged on the ratchet seat. The bottom cover is rotatably arranged at the end part of the ratchet wheel seat; and the whole vehicle rotating speed sensor is arranged between the ratchet wheel seat and the bottom cover. The whole vehicle rotating speed sensor is used for sensing the rotating speed of the ratchet wheel seat relative to the bottom cover. If the tooth ratio of the flywheel to the fluted disc is adjusted to be between 1 and 0.5, the number of pulse signals output by the whole vehicle rotating speed sensor is between 24 and 150 every time the fluted disc rotates by one circle.

Description

[0001] The present invention claims priority from U.S. patent application numbered 63 / 528067, filed on July 20, 2023, entitled “FreehubTorque Measuring Apparatus and Measuring Method thereof.” Technical Field

[0002] The invention relates to a bicycle sensing framework, and in particular to a driving system and a sensing ratchet assembly suitable for a bicycle. Background Art

[0003] As people's requirements for smart travel continue to increase, power-assisted bicycles are becoming more and more popular. At present, power-assisted bicycles with torque sensors need to rely on the coordination of pedaling frequency and pedaling direction to better control the start, power off and power size of the motor. Currently, the front drive module is usually subjected to torque sensing. However, the torque sensor currently used has a low sensitivity. The detection of the front drive module requires the active pedaling of pedestrians to be effective. The sudden deceleration caused by road conditions and the sharp increase in power assistance demand are easily not detected and cannot provide effective power assistance. Summary of the invention

[0004] The present invention provides a sensing ratchet assembly which can effectively improve the transmission sensitivity of the rear wheel and a bicycle equipped with the sensing ratchet assembly to solve the above problems.

[0005] Based on the above purpose, the present invention provides a bicycle driving system, which comprises: a toothed disc, which rotates with human input; a chain, which connects the toothed disc; a flywheel, which comprises a plurality of toothed plates coaxially stacked on a rear wheel shaft, and the flywheel is connected to the chain through one of the plurality of toothed plates, so that the flywheel is driven by the chain and linked to the toothed disc; and

[0006] A sensing ratchet assembly is axially connected to one side of the flywheel, and the sensing ratchet assembly includes: a ratchet seat; a ratchet shell rotatably disposed on the ratchet seat; a bottom cover rotatably disposed at the end of the ratchet seat; and a vehicle speed sensor disposed between the ratchet seat and the bottom cover, and the vehicle speed sensor is used to sense the speed of the ratchet seat relative to the bottom cover; wherein, when the gear ratio of the flywheel and the toothed disc is adjusted to between 1 and 0.5, when the toothed disc rotates one circle, the number of pulse signals output by the vehicle speed sensor is between 24 and 150.

[0007] Preferably, the vehicle speed sensor includes: a vehicle speed sensing element, fixed to the ratchet seat; and a vehicle speed sensing module, fixed to the bottom cover and opposite to the vehicle speed sensing element; wherein, when the ratchet seat rotates relative to the bottom cover, the vehicle speed sensing module senses the vehicle speed sensing element and outputs a plurality of first vehicle speed pulse signals and a plurality of second vehicle speed pulse signals, and a phase difference between the plurality of first vehicle speed pulse signals and the plurality of second vehicle speed pulse signals is 90 degrees.

[0008] Preferably, the vehicle speed sensing module includes a first vehicle speed sensor and a second vehicle speed sensor, the first vehicle speed sensor and the second vehicle speed sensor are arranged along a radial straight line of the vehicle speed sensing module, the vehicle speed sensing element includes a plurality of first vehicle speed target elements and a plurality of second vehicle speed target elements, the plurality of first vehicle speed target elements and the plurality of second vehicle speed target elements are arranged in two adjacent rings and staggered with each other, the first vehicle speed sensor senses the plurality of first vehicle speed target elements and outputs the plurality of first vehicle speed pulse signals, and the second vehicle speed sensor senses the plurality of second vehicle speed target elements and outputs the plurality of second vehicle speed pulse signals.

[0009] Preferably, the vehicle speed sensing module also includes a position sensor, the first vehicle speed sensor, the second vehicle speed sensor and the position sensor are arranged in a radial straight line along the vehicle speed sensing module, and the vehicle speed sensing element includes a position target element; when the gear rotates one circle, the position sensor senses the position target element and outputs a position pulse signal.

[0010] Preferably, the vehicle speed sensing module includes a first vehicle speed sensor and a second vehicle speed sensor, the first vehicle speed sensor and the second vehicle speed sensor are arranged at an arc angle of 90 degrees, the vehicle speed sensing element includes a plurality of vehicle speed target elements, the plurality of vehicle speed target elements are arranged in a ring, the first vehicle speed sensor senses the plurality of vehicle speed target elements and outputs the plurality of first vehicle speed pulse signals, and the second vehicle speed sensor senses the plurality of vehicle speed target elements and outputs the plurality of second vehicle speed pulse signals.

[0011] Preferably, the vehicle speed sensing module also includes a position sensor, the first vehicle speed sensor and the position sensor are arranged in a radial straight line along the vehicle speed sensing module, and the vehicle speed sensing element includes a position target element; when the gear rotates one circle, the position sensor senses the position target element and outputs a position pulse signal.

[0012] Preferably, the sensing ratchet assembly further comprises a reverse speed sensor disposed between the ratchet seat and the ratchet housing, the reverse speed sensor being used to sense the speed of the ratchet housing relative to the ratchet seat, the reverse speed sensor comprising:

[0013] A reverse speed sensing element fixed to the ratchet housing; and

[0014] A reverse speed sensing module is fixed to the ratchet base and is opposite to the reverse speed sensing element;

[0015] When the ratchet housing rotates relative to the ratchet seat, the reverse speed sensing module senses the reverse speed sensing element and outputs a plurality of first reverse speed pulse signals and a plurality of second reverse speed pulse signals, and the phase difference between the plurality of first reverse speed pulse signals and the plurality of second reverse speed pulse signals is 90 degrees.

[0016] Preferably, the reverse speed sensing module includes a first reverse speed sensor and a second reverse speed sensor, the first reverse speed sensor and the second reverse speed sensor are arranged in an axial straight line along the reverse speed sensing module, the reverse speed sensing element includes a plurality of first reverse speed target elements and a plurality of second reverse speed target elements, the plurality of first reverse speed target elements and the plurality of second reverse speed target elements are arranged in two adjacent rings and staggered with each other, the first reverse speed sensor senses the plurality of first reverse speed target elements and outputs the plurality of first reverse speed pulse signals, and the second reverse speed sensor senses the plurality of second reverse speed target elements and outputs the plurality of second reverse speed pulse signals.

[0017] Preferably, the reverse speed sensing module also includes a position sensor, the first reverse speed sensor, the second reverse speed sensor and the position sensor are arranged in a straight line along the axial direction of the reverse speed sensing module, and the reverse speed sensing element includes a position target element; when the gear rotates one circle, the position sensor senses the position target element and outputs a position pulse signal.

[0018] Preferably, the reverse speed sensing module includes a first reverse speed sensor and a second reverse speed sensor, the first reverse speed sensor and the second reverse speed sensor are arranged at an arc angle of 90 degrees, the reverse speed sensing element includes a plurality of reverse speed target elements, the plurality of reverse speed target elements are arranged in a ring, the first reverse speed sensor senses the plurality of reverse speed target elements and outputs the plurality of first reverse speed pulse signals, and the second reverse speed sensor senses the plurality of reverse speed target elements and outputs the plurality of second reverse speed pulse signals.

[0019] Preferably, the reverse speed sensing module also includes a position sensor, the first reverse speed sensor and the position sensor are arranged in a straight line along the axial direction of the reverse speed sensing module, and the reverse speed sensing element includes a position target element; when the gear rotates one circle, the position sensor senses the position target element and outputs a position pulse signal.

[0020] Preferably, the sensing ratchet assembly further includes a processor and a torque force measurement module, wherein the torque force measurement module is used to measure the torque applied to the sensing ratchet assembly, and the processor obtains the pedaling power according to the torque.

[0021] Based on the above purpose, the present invention also provides a bicycle driving system, which comprises: a toothed disc, which rotates with human input; a chain, which connects the toothed disc; a flywheel, which comprises a plurality of toothed plates coaxially stacked on a rear wheel shaft, and the flywheel is connected to the chain through one of the plurality of toothed plates, so that the flywheel is driven by the chain and linked to the toothed disc; and

[0022] A sensing ratchet assembly is axially connected to one side of the flywheel, and the sensing ratchet assembly includes: a ratchet seat; a ratchet shell rotatably disposed on the ratchet seat; a bottom cover rotatably disposed on the end of the ratchet seat; and a vehicle speed sensor disposed between the ratchet seat and the bottom cover, and the vehicle speed sensor is used to sense the speed of the ratchet seat relative to the bottom cover; wherein the percentage of the gear ratio of the flywheel and the toothed disc and the number of pulse signals output by the vehicle speed sensor is between 0.33% and 4.17%.

[0023] Based on the above purpose, the present invention further provides a sensing ratchet assembly, which comprises: a ratchet seat; a ratchet shell rotatably disposed on the ratchet seat; a bottom cover rotatably disposed on an end of the ratchet seat; and

[0024] The vehicle speed sensor is arranged between the ratchet seat and the bottom cover. The vehicle speed sensor is used to sense the rotation speed of the ratchet seat relative to the bottom cover. The vehicle speed sensor includes: a vehicle speed sensing element fixed to the ratchet seat; and a vehicle speed sensing module fixed to the bottom cover and opposite to the vehicle speed sensing element; wherein, when the ratchet seat rotates relative to the bottom cover, the vehicle speed sensing module senses the vehicle speed sensing element and outputs a plurality of first vehicle speed pulse signals and a plurality of second vehicle speed pulse signals, and the phase difference between the plurality of first vehicle speed pulse signals and the plurality of second vehicle speed pulse signals is 90 degrees.

[0025] Preferably, when the ratchet seat rotates one circle relative to the bottom cover, the number of pulse signals output by the vehicle speed sensor is between 24 and 150.

[0026] In summary, the sensing ratchet assembly of the present invention is arranged on the flywheel of the rear transmission component. When the gear ratio of the flywheel to the toothed disc is between 1 and 0.5, and when the flywheel rotates one circle, the number of pulse signals output by the vehicle speed sensor is between 24 and 150. In this way, when the gear ratio is less than 1, the number of pulse signals output by the vehicle speed sensor can be effectively increased, thereby improving the rear wheel transmission sensitivity of the power-assisted bicycle. In one embodiment, the present invention can make the phase difference between the first vehicle speed pulse signal and the second vehicle speed pulse signal output by the vehicle speed sensing module be 90 degrees, so as to increase the number of pulse signals output by the vehicle speed sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. 1 is a schematic diagram of a power-assisted bicycle according to an embodiment of the present invention.

[0028] Figure 2 for Figure 1 Side view of the rear drive module in.

[0029] Figure 3 for Figure 2 Exploded view of the rear drive module.

[0030] Figure 4 for Figure 3 A stereoscopic image of the sensing ratchet assembly from another perspective.

[0031] Figure 5 for Figure 3 Exploded view of the sensing ratchet assembly in Figure 1.

[0032] Figure 6 for Figure 5 A stereoscopic view of the ratchet housing in FIG.

[0033] Figure 7 for Figure 5 A three-dimensional view of the ratchet seat in FIG.

[0034] Figure 8 for Figure 5 Top view of the vehicle speed sensor.

[0035] Fig. 9 for Figure 5 A three-dimensional view of the reverse speed sensor in FIG.

[0036] Fig.10 A schematic diagram of a pulse signal in digital form.

[0037] Fig.11 A schematic diagram of a pulse signal in analog form.

[0038] Fig.12 FIG. 4 is a top view of a vehicle speed sensor according to another embodiment of the present invention.

[0039] Fig.13 FIG. 4 is a perspective view of a reverse rotation speed sensor according to another embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0041] For the following embodiments of the present invention regarding power sensing of bicycles, please refer to Figures 1 to 11 , Figure 1 is a schematic diagram of a bicycle 1 according to an embodiment of the present invention, Figure 2 for Figure 1 A side view of the rear drive module 1a in FIG. Figure 3 for Figure 2 Exploded view of rear drive module 1a, Figure 4 for Figure 3 A stereoscopic view of the sensing ratchet assembly 24 at another viewing angle, Figure 5 for Figure 3 An exploded view of the sensing ratchet assembly 24 in FIG. Figure 6 for Figure 5 A three-dimensional view of the ratchet housing 242 in FIG. Figure 7 for Figure 5 A three-dimensional view of the ratchet seat 240, Figure 8 for Figure 5 A top view of the vehicle speed sensor 246 in FIG. Fig. 9 for Figure 5 A perspective view of the reverse speed sensor 248 in FIG. Fig.10 This is a schematic diagram of a pulse signal in digital form. Fig.11 A schematic diagram of a pulse signal in analog form.

[0042] like Figures 1 to 3As shown, the bicycle 1 includes a frame 10, a front wheel 12, a rear wheel 14, a rear drive module 1a and a front drive module 1b; the bicycle 1 also includes a battery (not shown) disposed in the frame 10 to provide power to the motor 14. In order to focus on the embodiment of the present invention, a few components are omitted for introduction. The frame 10 may have a broader definition here, for example, in addition to the rigid frame body straddling the front wheel 12 and the rear wheel 14, the frame 10 also includes a handlebar on the front side of the frame, a saddle, a front fork (not shown) connecting the handlebar / the front end of the frame / the front wheel, and a seat stay (not shown) and a chain stay (not shown) connecting the rear end of the frame and the rear wheel 14. The rear drive module 1a and the front drive module 1b constitute the drive system of the bicycle 1. The rear drive module 1a includes a motor 26 coaxially arranged with the rear wheel 14, a sensing ratchet assembly 24 and a flywheel 22; the front drive module 1b includes a pivotally connected toothed disc 16, a crank 18 and a chain 20. The front wheel 14 and the rear wheel 12 are rotatably arranged at the front and rear sides of the frame 10, respectively. The toothed disc 16 is rotatably arranged at the middle of the frame 10, and the toothed disc 16 rotates with human input. The crank 18 is synchronously linked with the toothed disc 16. In actual application, two cranks 18 with pedals (not shown) are respectively arranged on opposite sides of the toothed disc 16, and the two cranks 18 can be linked through a five-way bearing (not shown). The chain 20 is sleeved on the toothed disc 16 of the front drive module 1b and the flywheel 22 of the rear drive module 1a, so that the flywheel 22 is synchronously linked with the toothed disc 16 through the chain 20, thereby the front wheel 12 and the rear wheel 14 can also rotate simultaneously. However, according to the difference in the number of teeth on the flywheel 22 and the toothed disc 16, the front wheel 12 and the rear wheel 14 may have the same or different rotation speeds. The motor 26 of the rear drive module 1a has a rear wheel shaft 260 that passes through the sensing ratchet assembly 24 and the flywheel 22 in sequence, so that the sensing ratchet assembly 24 is connected between the flywheel 22 and the motor 26, and the motor 26, the sensing ratchet assembly 24 and the flywheel 22 are coaxial. The rear wheel shaft 260 of the motor 26 also passes through the rear wheel 14, so that the output force of the motor 26 can be directly applied to the rear wheel 14. In other words, the rear wheel 14, the motor 26, the sensing ratchet assembly 24 and the flywheel 22 are coaxially arranged. Rear Drive Module In addition, the flywheel 22 is composed of a plurality of coaxial tooth plates stacked together; a front / rear transmission kit (not shown) is usually provided on the chain 20 to allow the chain 20 to move and switch between different tooth plates of the flywheel 22, and to adjust the chain 20 to maintain a suitable tightness after the speed change.

[0043] The bicycle 1 can have two power sources: human power and electric power. The human power part is the pedaling force input by the user through the pedal / sprocket 16 of the front drive module 1b, and the electric power part is provided by the battery to drive the rear drive module 1a to apply the rotational force of the motor 26 to the rear wheel 14. In order to accurately grasp the changes in human power input and provide power input in a timely and appropriate amount, the bicycle 1 must be equipped with multiple sensing components to monitor the rotation data of the rear drive module 1a on the rear wheel 14 and the front drive module 1b on the pedal / sprocket 16 respectively.

[0044] Generally speaking, there are three situations when the gear ratio (or speed ratio) of the sprocket 16 and the flywheel 22 is configured with different numbers of teeth: (1) The gear ratio of the sprocket / flywheel is 1:1 (the number of teeth of the sprocket 16 is greater than the number of teeth of the flywheel 22), and the number of rotations per unit time (speed) of the rear drive module 1a and the front drive module 1b is the same. (2) When the gear ratio of the sprocket / flywheel is greater than 1, the number of rotations per unit time of the rear drive module 1a will be greater than the number of rotations per unit time of the front drive module 1b. (3) When the gear ratio of the sprocket / flywheel is less than 1, the number of rotations per unit time of the rear drive module 1a will be less than the number of rotations per unit time of the front drive module 1b.

[0045] If the design logic of the power device of a non-assisted bicycle is adopted, medium-speed and high-speed riding are the main requirements, that is, the design focus is on the situation where the tooth ratio of the sprocket / flywheel is greater than or equal to 1 in the above-mentioned items (1) and (2). At this time, the best location for the torque sensor is in the front drive module 1b, especially the coaxially rotating five-way bearing, pedal and sprocket, because the purpose of the torque sensor is only to provide human power output data for the rider's reference. At this time, the sensing component located in the front drive module 1b usually only needs to have a lower sensitivity to be used. On the other hand, when encountering climbing or rough roads, the speed of the bicycle 1 suddenly decreases, that is, the number of rotations of the rear wheel 14 and the rear drive module 1a decreases rapidly. If the sensing component installed in the front drive module 1b is relied on, or the torque sensor is set in the front drive module 1b, there is often not enough response time to discover the speed reduction problem and the sudden increase in the power demand. Therefore, the embodiment of the present invention is to set the sensing ratchet group 24 containing the sensing component in the rear drive module 1a. The problem is that if the general sensing components used in the front drive module 1b are directly installed on the rear wheel 14, the sensing sensitivity is too low, and simply increasing the sensitivity still cannot solve the torque detection problem of the rear wheel 14. Therefore, the sensing ratchet assembly 24 disclosed in the embodiment of the present invention needs to be further adjusted in design.

[0046] like Figures 4 to 9As shown, the sensing ratchet assembly 24 includes a ratchet seat 240, a ratchet housing 242, a bottom cover 244, a vehicle speed sensor 246, and a reverse speed sensor 248. The ratchet seat 240 is rotatably connected to the motor 26 along the axial direction and can rotate with the motor 26 and the rear wheel 14. The ratchet housing 242 is rotatably disposed on the ratchet seat 240, and the bottom cover 244 is rotatably disposed at the end of the ratchet seat 240. The vehicle speed sensor 246 is disposed between the ratchet seat 240 and the bottom cover 244. The vehicle speed sensor 246 is used to sense the speed of the ratchet seat 240 relative to the bottom cover 244 to obtain the speed (revolutions per minute, RPM) of the rear wheel 14 and thereby calculate the vehicle travel speed of the bicycle 1. Preferably, the reverse speed sensor 248 is disposed between the ratchet seat 240 and the ratchet housing 242. The reverse speed sensor 248 is used to sense the speed of the ratchet housing 242 relative to the ratchet base 240. The vehicle speed sensor 246 can be used in conjunction with the reverse speed sensor 248 to determine the forward and reverse rotation of the toothed disc 16 and the flywheel 22, and estimate the pedaling frequency of the toothed disc 16.

[0047] like Figure 7 As shown, the ratchet seat 240 includes a pawl matching portion 2400, a seat bearing joint 2402, a deformation sensing portion 2404, a tension limiting portion 2406, and a load connecting portion 2408. Preferably, the load connecting portion 2408, the tension limiting portion 2406, the deformation sensing portion 2404, the pawl matching portion 2400, and the seat bearing joint 2402 are integrally formed. At least three pawl mounting grooves 2410 are equidistantly formed on the surface of the pawl matching portion 2400.

[0048] like Figure 6 As shown, the ratchet housing 242 includes a housing body 2420 and a housing stopper 2422. The housing stopper 2422 is integrally formed and arranged at the end of the housing body 2420. When the ratchet housing 242 and the ratchet seat 240 are assembled, one side of the load connection portion 2408 is clearance-matched with the end of the housing stopper 2422, so that the tension stopper 2406 and the housing stopper 2422 cooperate with each other to achieve stoppering.

[0049] like Figure 5 and Figure 6As shown, a shell bearing joint 2424 is provided in the shell body 2420. A first bearing 28 is provided in the gap between the shell body 2420 and the seat bearing joint 2402 to achieve rotational connection. The first bearing 28 and the shell bearing joint 2424 in the shell body 2420 are in interference fit, and the first bearing 28 and the seat bearing joint 2402 are in interference fit. Through the above arrangement, the rotational fit between the ratchet shell 242 and the ratchet seat 240 can be achieved. In addition, a second bearing 30 is also provided in the shell body 2420. The second bearing 30 is located outside the seat bearing joint 2402. Specifically, the second bearing 30 and the inner wall of the shell body 2420 are in interference fit, and the second bearing 30 is used to connect the external shaft.

[0050] like Figures 5 to 7 As shown, a plurality of evenly distributed ratchet teeth 2426 are provided in the ratchet housing 242, and a housing stopper 2422, a fixing groove 2428, ratchet teeth 2426 and a housing bearing joint 2424 are sequentially provided on the inner side of the ratchet housing 242. A ratchet 250 matching the ratchet teeth 2426 is provided on the ratchet seat 240. At least three ratchet pawls 250 are provided, and the number thereof corresponds to the number of the ratchet mounting grooves 2410. The ratchet 250 is installed in the ratchet mounting grooves 2410 corresponding thereto. At least three ratchet pawls 250 can be fixedly connected by a ratchet wire spring (not shown in the figure). After assembly, the positions of the ratchet 250 and the ratchet teeth 2426 correspond to each other to achieve mutual engagement. Since the ratchet 250 and the ratchet teeth 2426 are one-way engaged, a one-way torque can be applied to the ratchet seat 240 through the ratchet housing 242. Further, when the ratchet housing 242 is stepped on in the forward direction to apply torque, the ratchet teeth 2426 and the ratchet 250 on the ratchet housing 242 apply unidirectional torque to the ratchet seat 240. At this time, the ratchet housing 242 and the ratchet seat 240 keep running synchronously, that is, the ratchet housing 242 and the ratchet seat 240 are relatively stationary. It should be noted that when the forward rotation speed of the ratchet seat 240 is too fast and the forward stepping speed is too slow, the ratchet housing 242 and the ratchet seat 240 will rotate relative to each other. When the ratchet housing 242 is stepped on in the reverse direction to rotate in the reverse direction, the ratchet housing 242 will also rotate relative to the ratchet seat 240. In this embodiment, the ratchet 250 and the ratchet teeth 2426 constitute a one-way clutch mechanism.

[0051] like Figure 5 and Figure 8As shown, the vehicle speed sensor 246 includes a vehicle speed sensing element 2460 and a vehicle speed sensing module 2462. The vehicle speed sensing element 2460 is fixed to the ratchet seat 240. The vehicle speed sensing module 2462 is fixed to the bottom cover 244 and is opposite to the vehicle speed sensing element 2460. In this embodiment, the vehicle speed sensing module 2462 and the vehicle speed sensing element 2460 are arranged opposite to each other along the axial direction of the sensing ratchet assembly 24. When the crank 18 is stepped on in the forward direction, the ratchet seat 240 will rotate relative to the bottom cover 244. When the ratchet seat 240 rotates relative to the bottom cover 244, the vehicle speed sensing module 2462 will sense the vehicle speed sensing element 2460 and output a plurality of first vehicle speed pulse signals and a plurality of second vehicle speed pulse signals. In this embodiment, the phase difference between the plurality of first vehicle speed pulse signals and the plurality of second vehicle speed pulse signals is 90 degrees.

[0052] In this embodiment, the vehicle speed sensing module 2462 may include a first vehicle speed sensor 24620 and a second vehicle speed sensor 24622, wherein the first vehicle speed sensor 24620 and the second vehicle speed sensor 24622 are arranged in a radial straight line along the vehicle speed sensing module 2462. In addition, the vehicle speed sensing element 2460 may include a plurality of first vehicle speed target elements 24600 and a plurality of second vehicle speed target elements 24602, wherein the plurality of first vehicle speed target elements 24600 and the plurality of second vehicle speed target elements 24602 are arranged in two adjacent rings and are mutually staggered. When the ratchet seat 240 rotates relative to the bottom cover 244, the first vehicle speed sensor 24620 senses the plurality of first vehicle speed target elements 24600 and outputs a plurality of first vehicle speed pulse signals, and the second vehicle speed sensor 24622 senses the plurality of second vehicle speed target elements 24602 and outputs a plurality of second vehicle speed pulse signals. The first vehicle speed pulse signal and the second vehicle speed pulse signal can be used to obtain the speed of the rear wheel 14 and the vehicle speed of the bicycle 1. In a preferred embodiment, the vehicle speed sensing module 2462 may further include a position sensor 24624, wherein the first vehicle speed sensor 24620, the second vehicle speed sensor 24622 and the position sensor 24624 are arranged in a radial straight line along the vehicle speed sensing module 2462. In addition, the vehicle speed sensing element 2460 may further include a position target element 24604. When the gear plate 22 rotates one circle, the vehicle speed sensing element 2460 rotates one circle accordingly, and the position sensor 24624 senses the position target element 24604 and outputs a position pulse signal. The position pulse signal can be used to determine the absolute position of the rotating shaft.

[0053] In one embodiment, the first vehicle speed sensor 24620, the second vehicle speed sensor 24622 and the position sensor 24624 may be magnetic sensors, and the first vehicle speed target element 24600, the second vehicle speed target element 24602 and the position target element 24604 may be formed by magnetizing at corresponding positions. In another embodiment, the first vehicle speed sensor 24620, the second vehicle speed sensor 24622 and the position sensor 24624 may be optical sensors, and the first vehicle speed target element 24600, the second vehicle speed target element 24602 and the position target element 24604 may be formed by etching gratings at corresponding positions. In another embodiment, the first vehicle speed sensor 24620, the second vehicle speed sensor 24622 and the position sensor 24624 may be capacitive sensors, and the first vehicle speed target element 24600, the second vehicle speed target element 24602 and the position target element 24604 may be formed by laying metal wires at corresponding positions.

[0054] In one embodiment, the first vehicle speed pulse signal, the second vehicle speed pulse signal and the position pulse signal may be digital signals, such as Fig.10 In another embodiment, the first vehicle speed pulse signal, the second vehicle speed pulse signal and the position pulse signal may be analog signals, such as Fig.11 shown.

[0055] In this embodiment, when the gear ratio of the flywheel 22 and the toothed disc 16 is between 1 and 0.5, and when the toothed disc 22 rotates one circle, the vehicle speed sensing element 2460 rotates one circle accordingly, and the number of pulse signals output by the vehicle speed sensor 246 is between 24 and 150 (that is, when the ratchet seat 240 rotates one circle relative to the bottom cover 244, the number of pulse signals output by the vehicle speed sensor 246 is between 24 and 150). In other words, the percentage of the gear ratio and the number of pulse signals is between 0.33% and 4.17%. In this way, when the gear ratio is less than 1, the number of pulse signals output by the vehicle speed sensor 246 can be effectively increased, thereby improving the rear wheel transmission sensitivity of the bicycle 1.

[0056] like Figure 5 and Fig. 9As shown, the reverse speed sensor 248 may include a reverse speed sensing element 2480 and a reverse speed sensing module 2482. The reverse speed sensing element 2480 is fixed to the ratchet housing 242. The reverse speed sensing module 2482 is fixed to the ratchet seat 240 and is opposite to the reverse speed sensing element 2480. In this embodiment, the reverse speed sensing module 2482 and the reverse speed sensing element 2480 are arranged opposite to each other along the radial direction of the sensing ratchet assembly 24. When the crank 18 is stepped on in the reverse direction, the ratchet housing 242 rotates relative to the ratchet seat 240. When the ratchet housing 242 rotates relative to the ratchet seat 240, the reverse speed sensing module 2482 senses the reverse speed sensing element 2480 and outputs a plurality of first reverse speed pulse signals and a plurality of second reverse speed pulse signals. In this embodiment, the phase difference between the plurality of first reverse speed pulse signals and the plurality of second reverse speed pulse signals is 90 degrees.

[0057] In this embodiment, the reverse speed sensing module 2482 may include a first reverse speed sensor 24820 and a second reverse speed sensor 24822, wherein the first reverse speed sensor 24820 and the second reverse speed sensor 24822 are arranged in a straight line along the axial direction of the reverse speed sensing module 2482. In addition, the reverse speed sensing element 2480 includes a plurality of first reverse speed target elements 24800 and a plurality of second reverse speed target elements 24802, wherein the plurality of first reverse speed target elements 24800 and the plurality of second reverse speed target elements 24802 are arranged in two adjacent rings and are mutually staggered. When the ratchet housing 242 rotates relative to the ratchet seat 240, the first reverse speed sensor 24820 senses the plurality of first reverse speed target elements 24800 and outputs a plurality of first reverse speed pulse signals, and the second reverse speed sensor 24822 senses the plurality of second reverse speed target elements 24802 and outputs a plurality of second reverse speed pulse signals. The first reverse speed pulse signal and the second reverse speed pulse signal can be used in conjunction with the first vehicle speed pulse signal and the second vehicle speed pulse signal to determine the forward and reverse rotation of the sprocket 16 and the flywheel 22, and estimate the pedaling frequency of the sprocket 16. In this embodiment, the reverse speed sensing module 2482 may further include a position sensor 24824, wherein the first reverse speed sensor 24820, the second reverse speed sensor 24822 and the position sensor 24824 are arranged in a straight line along the axial direction of the reverse speed sensing module 2482. In addition, the reverse speed sensing element 2480 may further include a position target element 24804. When the sprocket 22 rotates one circle, the vehicle speed sensing element 2460 rotates one circle accordingly, and the position sensor 24824 senses the position target element 24804 and outputs a position pulse signal. The position pulse signal can be used to determine the absolute position of the rotating shaft.

[0058] In one embodiment, the first reverse speed sensor 24820, the second reverse speed sensor 24822, and the position sensor 24824 may be magnetic sensors, and the first reverse speed target element 24800, the second reverse speed target element 24802, and the position target element 24804 may be formed by magnetizing at corresponding positions. In another embodiment, the first reverse speed sensor 24820, the second reverse speed sensor 24822, and the position sensor 24824 may be optical sensors, and the first reverse speed target element 24800, the second reverse speed target element 24802, and the position target element 24804 may be formed by etching gratings at corresponding positions. In another embodiment, the first reverse speed sensor 24820, the second reverse speed sensor 24822 and the position sensor 24824 may be capacitive sensors, and the first reverse speed target element 24800, the second reverse speed target element 24802 and the position target element 24804 may be formed by laying metal wires at corresponding positions.

[0059] In one embodiment, the first reverse speed pulse signal, the second reverse speed pulse signal and the position pulse signal can be digital signals. In another embodiment, the first reverse speed pulse signal, the second reverse speed pulse signal and the position pulse signal can be analog signals.

[0060] like Figure 8 and Fig. 9 As shown, the sensing ratchet assembly 24 may further include a processor 252 and a torque force measurement module 254, wherein the processor 252 may be disposed in the vehicle speed sensing module 2462, and the torque force measurement module 254 may be disposed in the reverse speed sensing module 2482. The torque force measurement module 254 is used to measure the torque applied to the sensing ratchet assembly 24, so that the processor 252 can obtain the pedaling power according to the torque. Further, the torque force measurement module 254 may be disposed on the ratchet seat 240 along with the reverse speed sensing module 2482. The torque force measurement module 254 is used to sense the magnitude of the external force distortion deformation to obtain the distortion deformation signal applied by the external force. The torque force measurement module 254 can be fixed on the surface of the deformation sensing part 2404. The external force applies torque to the ratchet housing 242 through the flywheel 22, and the torque is applied to the load connection part 2408 through the mutual cooperation between the ratchet teeth 2426 and the ratchet 250 through the deformation sensing part 2404. In the above process, the torque force measurement module 254 will produce a deformation corresponding to the torque magnitude to obtain the signal of the distortion deformation applied by the external force. The processor 252 can control the motor 26 according to the signal size of the distortion deformation applied by the external force to achieve the corresponding torque and speed regulation. The torque force measurement module 254 can measure the torque through the strain gauge. Then, the processor 252 can multiply the torque by the rear wheel speed to obtain the pedaling power.

[0061] See also Fig.12 , Fig.12FIG. 2 is a top view of a vehicle speed sensor 246 ′ according to another embodiment of the present invention.

[0062] like Fig.12 As shown, the vehicle speed sensing module 2462 of the vehicle speed sensor 246' includes a first vehicle speed sensor 24620, a second vehicle speed sensor 24622 and a position sensor 24624, wherein the first vehicle speed sensor 24620 and the second vehicle speed sensor 24622 are arranged at an arc angle of 90 degrees, and the first vehicle speed sensor 24620 and the position sensor 24624 are arranged along the radial straight line of the vehicle speed sensing module 2462. In addition, the vehicle speed sensing element 2460 of the vehicle speed sensor 246' includes a plurality of vehicle speed target elements 24606 and a position target element 24604, wherein the plurality of vehicle speed target elements 24606 are arranged in a ring.

[0063] Figure 5 The vehicle speed sensor 246 shown can Fig.12 The vehicle speed sensor 246' shown is replaced. When the ratchet seat 240 rotates relative to the bottom cover 244, the first vehicle speed sensor 24620 will sense multiple vehicle speed target elements 24606 and output multiple first vehicle speed pulse signals, and the second vehicle speed sensor 24622 will sense multiple vehicle speed target elements 24606 and output multiple second vehicle speed pulse signals. In addition, when the gear plate 22 rotates one circle, the vehicle speed sensing element 2460 rotates one circle accordingly, and the position sensor 24624 will sense the position target element 24604 and output a position pulse signal. It should be noted that the functions of the first vehicle speed pulse signal, the second vehicle speed pulse signal and the position pulse signal are as described above and will not be repeated here.

[0064] See also Fig.13 , Fig.13 FIG. 2 is a perspective view of a reverse rotation speed sensor 248 ′ according to another embodiment of the present invention.

[0065] like Fig.13 As shown, the reverse speed sensing module 2482 of the reverse speed sensor 248' includes a first reverse speed sensor 24820, a second reverse speed sensor 24822, and a position sensor 24824, wherein the first reverse speed sensor 24820 and the second reverse speed sensor 24822 are arranged at an arc angle of 90 degrees, and the first reverse speed sensor 24820 and the position sensor 24824 are arranged in a straight line along the axial direction of the reverse speed sensing module 2482. In addition, the reverse speed sensing element 2480 of the reverse speed sensor 248' includes a plurality of reverse speed target elements 24806 and a position target element 24804, wherein the plurality of reverse speed target elements 24806 are arranged in a ring shape.

[0066] Figure 5 The reverse speed sensor 248 shown may Fig.13 The reverse speed sensor 248' shown in the figure is replaced. When the ratchet housing 242 rotates relative to the ratchet seat 240, the first reverse speed sensor 24820 will sense the multiple reverse speed target elements 24806 and output multiple first reverse speed pulse signals, and the second reverse speed sensor 24822 will sense the multiple reverse speed target elements 24806 and output multiple second reverse speed pulse signals. In addition, when the toothed disc 22 rotates one circle, the vehicle speed sensing element 2460 rotates one circle accordingly, and the position sensor 24824 will sense the position target element 24804 and output a position pulse signal. It should be noted that the functions of the first reverse speed pulse signal, the second reverse speed pulse signal and the position pulse signal are as described above and will not be repeated here.

[0067] In summary, the sensing ratchet assembly of the present invention is arranged on the flywheel of the rear transmission component. When the gear ratio of the flywheel and the toothed disc is between 1 and 0.5, and when the toothed disc 22 rotates one circle, the number of pulse signals output by the vehicle speed sensor is between 24 and 150. In this way, when the gear ratio is less than 1, the number of pulse signals output by the vehicle speed sensor can be effectively increased, thereby optimizing the rear wheel transmission sensitivity of the power-assisted bicycle. In one embodiment, the present invention can make the phase difference between the first vehicle speed pulse signal and the second vehicle speed pulse signal output by the vehicle speed sensing module be 90 degrees, so as to adjust the pulse signal output by the vehicle speed sensor to the most appropriate number. In addition, although the bicycle of the aforementioned embodiment is provided with an electric power source and a motor, the drive system and sensing ratchet assembly of the present case can also be applied to general bicycles without auxiliary power.

[0068] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A bicycle drive system, characterized in that: Include: The toothed disc rotates with human input; A chain connecting the toothed discs; A flywheel, comprising a plurality of gears coaxially stacked on the rear wheel shaft, the flywheel being connected to the chain via one of the plurality of gears, so that the flywheel is driven by the chain and linked to the sprocket; and A sensing ratchet assembly is axially connected to one side of the flywheel, and the sensing ratchet assembly comprises: Ratchet seat; A ratchet housing is rotatably disposed on the ratchet seat; A bottom cover rotatably disposed on an end of the ratchet seat; and A vehicle speed sensor is disposed between the ratchet base and the bottom cover, and is used to sense the speed of the ratchet base relative to the bottom cover; When the gear ratio of the flywheel to the sprocket is adjusted to between 1 and 0.5, the number of pulse signals output by the vehicle speed sensor is between 24 and 150 when the sprocket rotates one circle.

2. The bicycle drive system according to claim 1, characterized in that: The vehicle speed sensor includes: A vehicle speed sensing element is fixed to the ratchet seat; and A vehicle speed sensing module is fixed to the bottom cover and is opposite to the vehicle speed sensing element; When the ratchet seat rotates relative to the bottom cover, the vehicle speed sensing module senses the vehicle speed sensing element and outputs multiple first vehicle speed pulse signals and multiple second vehicle speed pulse signals. The phase difference between the multiple first vehicle speed pulse signals and the multiple second vehicle speed pulse signals is 90 degrees.

3. The bicycle drive system according to claim 2, characterized in that: The vehicle speed sensing module includes a first vehicle speed sensor and a second vehicle speed sensor. The first vehicle speed sensor and the second vehicle speed sensor are arranged in a radial straight line along the vehicle speed sensing module. The vehicle speed sensing element includes a plurality of first vehicle speed target elements and a plurality of second vehicle speed target elements. The plurality of first vehicle speed target elements and the plurality of second vehicle speed target elements are arranged in two adjacent rings and are staggered with each other. The first vehicle speed sensor senses the plurality of first vehicle speed target elements and outputs the plurality of first vehicle speed pulse signals. The second vehicle speed sensor senses the plurality of second vehicle speed target elements and outputs the plurality of second vehicle speed pulse signals.

4. The bicycle drive system according to claim 3, characterized in that: The vehicle speed sensing module also includes a position sensor. The first vehicle speed sensor, the second vehicle speed sensor and the position sensor are arranged in a radial straight line along the vehicle speed sensing module. The vehicle speed sensing element includes a position target element. When the gear wheel rotates one circle, the position sensor senses the position target element and outputs a position pulse signal.

5. The bicycle drive system according to claim 2, wherein: The vehicle speed sensing module includes a first vehicle speed sensor and a second vehicle speed sensor. The first vehicle speed sensor and the second vehicle speed sensor are arranged at an arc angle of 90 degrees. The vehicle speed sensing element includes a plurality of vehicle speed target elements. The plurality of vehicle speed target elements are arranged in a ring. The first vehicle speed sensor senses the plurality of vehicle speed target elements and outputs the plurality of first vehicle speed pulse signals. The second vehicle speed sensor senses the plurality of vehicle speed target elements and outputs the plurality of second vehicle speed pulse signals.

6. The bicycle drive system according to claim 5, characterized in that: The vehicle speed sensing module also includes a position sensor. The first vehicle speed sensor and the position sensor are arranged in a radial straight line along the vehicle speed sensing module. The vehicle speed sensing element includes a position target element. When the gear wheel rotates one circle, the position sensor senses the position target element and outputs a position pulse signal.

7. The bicycle drive system according to claim 1, wherein: The sensing ratchet assembly further includes a reverse speed sensor, which is disposed between the ratchet seat and the ratchet shell. The reverse speed sensor is used to sense the speed of the ratchet shell relative to the ratchet seat. The reverse speed sensor includes: A reverse speed sensing element fixed to the ratchet housing; and A reverse speed sensing module is fixed to the ratchet base and is opposite to the reverse speed sensing element; When the ratchet housing rotates relative to the ratchet seat, the reverse speed sensing module senses the reverse speed sensing element and outputs a plurality of first reverse speed pulse signals and a plurality of second reverse speed pulse signals, and the phase difference between the plurality of first reverse speed pulse signals and the plurality of second reverse speed pulse signals is 90 degrees.

8. The bicycle drive system according to claim 7, wherein: The reverse rotation speed sensing module includes a first reverse rotation speed sensor and a second reverse rotation speed sensor, the first reverse rotation speed sensor and the second reverse rotation speed sensor are arranged in a straight line along the axial direction of the reverse rotation speed sensing module, the reverse rotation speed sensing element includes a plurality of first reverse rotation speed target elements and a plurality of second reverse rotation speed target elements, the plurality of first reverse rotation speed target elements and the plurality of second reverse rotation speed target elements are arranged in two adjacent rings and are staggered with each other, the first reverse rotation speed sensor senses the plurality of first reverse rotation speed target elements and outputs the plurality of first reverse rotation speed pulse signals, and the second reverse rotation speed sensor senses the plurality of second reverse rotation speed target elements and outputs the plurality of second reverse rotation speed pulse signals.

9. The bicycle drive system according to claim 8, wherein: The reverse speed sensing module also includes a position sensor. The first reverse speed sensor, the second reverse speed sensor and the position sensor are arranged in a straight line along the axial direction of the reverse speed sensing module. The reverse speed sensing element includes a position target element. When the gear rotates one circle, the position sensor senses the position target element and outputs a position pulse signal.

10. The bicycle drive system according to claim 7, wherein: The reverse speed sensing module includes a first reverse speed sensor and a second reverse speed sensor, the first reverse speed sensor and the second reverse speed sensor are arranged at an arc angle of 90 degrees, the reverse speed sensing element includes a plurality of reverse speed target elements, the plurality of reverse speed target elements are arranged in a ring, the first reverse speed sensor senses the plurality of reverse speed target elements and outputs the plurality of first reverse speed pulse signals, the second reverse speed sensor senses the plurality of reverse speed target elements and outputs the plurality of second reverse speed pulse signals.

11. The bicycle drive system according to claim 10, wherein: The reverse speed sensing module also includes a position sensor. The first reverse speed sensor and the position sensor are arranged in a straight line along the axial direction of the reverse speed sensing module. The reverse speed sensing element includes a position target element. When the gear rotates one circle, the position sensor senses the position target element and outputs a position pulse signal.

12. The bicycle drive system according to claim 1, wherein: The sensing ratchet assembly further comprises a processor and a torque force measurement module, wherein the torque force measurement module is used to measure the torque applied to the sensing ratchet assembly, and the processor obtains the pedaling power according to the torque.

13. A bicycle drive system, characterized in that: Include: The toothed disc rotates with human input; A chain connecting the toothed discs; A flywheel, comprising a plurality of gears coaxially stacked on the rear wheel shaft, the flywheel being connected to the chain via one of the plurality of gears, so that the flywheel is driven by the chain and linked to the sprocket; and A sensing ratchet assembly is axially connected to one side of the flywheel, and the sensing ratchet assembly comprises: Ratchet seat; A ratchet housing is rotatably disposed on the ratchet seat; A bottom cover rotatably disposed on an end of the ratchet seat; and A vehicle speed sensor is disposed between the ratchet base and the bottom cover, and is used to sense the speed of the ratchet base relative to the bottom cover; The percentage of the gear ratio between the flywheel and the gear plate and the number of pulse signals output by the vehicle speed sensor is between 0.33% and 4.17%.

14. A sensing ratchet assembly, characterized in that: Include: Ratchet seat; A ratchet housing is rotatably disposed on the ratchet seat; A bottom cover rotatably disposed on an end of the ratchet seat; and The vehicle speed sensor is disposed between the ratchet base and the bottom cover. The vehicle speed sensor is used to sense the speed of the ratchet base relative to the bottom cover. The vehicle speed sensor includes: A vehicle speed sensing element is fixed to the ratchet seat; and A vehicle speed sensing module is fixed to the bottom cover and is opposite to the vehicle speed sensing element; When the ratchet seat rotates relative to the bottom cover, the vehicle speed sensing module senses the vehicle speed sensing element and outputs multiple first vehicle speed pulse signals and multiple second vehicle speed pulse signals. The phase difference between the multiple first vehicle speed pulse signals and the multiple second vehicle speed pulse signals is 90 degrees.

15. The sensing ratchet assembly according to claim 14, characterized in that: When the ratchet seat rotates one circle relative to the bottom cover, the number of pulse signals output by the vehicle speed sensor is between 24 and 150.

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