WO2022016698A1

WO2022016698A1 - Speed changing system having shape-change torsion sensing structure, and power-assisted bicycle

Info

Publication number: WO2022016698A1
Application number: PCT/CN2020/116662
Authority: WO
Inventors: 王培郁; 柯韦圣
Original assignee: 珠海市钧兴机电有限公司
Priority date: 2020-07-22
Filing date: 2020-09-22
Publication date: 2022-01-27
Also published as: CN213502778U

Abstract

A speed changing system having a shape-change torsion sensing structure, and a power-assisted bicycle. The speed changing system comprises a pedal through-shaft (1), a first gear (2), a second gear (3), a third gear (4), a deformable bracket (5), an electric motor, a controller and a housing (6), wherein the first gear (2) and the third gear (4) are arranged in the housing (6) and are sheathed over the pedal through shaft (1); the second gear (3) is in meshing connection with the first gear (2) and the third gear (4); and one end of the second gear (3) is rotatably mounted on the housing (6), and the other end thereof is mounted on the housing (6) via the deformable bracket (5). According to the speed changing system, detected strain value signals of the deformable bracket (5) are directly transmitted to the controller by means of a strain gauge (7) without any electronic component, which can greatly reduce the risk of faults, and can also simplify the structure and achieve a stable and reliable performance. In addition, the electric motor can be automatically controlled in real time to provide auxiliary power without manual operation, so as to achieve easier and more comfortable riding and improving the enjoyment of riding. The speed changing system has a simple structure, is easy to implement, and is beneficial for both the popularization and use thereof.

Description

A speed change system and a power-assisted bicycle with a deformable torsion sensing structure

technical field

The invention belongs to the technical field of power-assisted bicycles, and in particular relates to a speed change system and a power-assisted bicycle with a deformable torsion sensing structure.

Background technique

Power-assisted bicycles have the advantages of labor saving, large load and fast speed, and have quickly become the main tool for people to travel and transport for short distances. However, the applicant found that: the existing power-assisted bicycles on the market are all provided with a twist sleeve on the pedal shaft, and the central motor on the bicycle is controlled by detecting the torsional deformation of the twist sleeve, but the torsion of the twist sleeve is The deformation detection accuracy is low, which seriously affects the control of the central motor. For this reason, two PCB boards must be installed on the helper at the same time. The first PCB board is fixed on the twist sleeve. As the twist sleeve rotates, it receives the torque signal. The second PCB board is fixed on the housing of the central motor and is connected to the controller by wires. At the same time, the two PCB boards must be placed in parallel, and the communication is connected by wireless transmission. The transmission of power and signals sends the torsional deformation of the twist sleeve (the signal that feels the torque) detected by the first PCB board to the second PCB board to control the control of the central motor when the bicycle is riding. This kind of structure has high requirements on the assembly accuracy of the housing, and because of the large number of electronic components, the production and processing are difficult, and the detected torsional deformation signal of the twist sleeve is transmitted to the center motor through the first PCB board and the second PCB board. controller, and wireless transmission is used between the first PCB board and the second PCB board, which may easily lead to signal failure, thereby resulting in low product reliability.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the present invention provides a method to directly transmit the strain value signal detected by the deformed support to the controller through the strain gauge, without going through any electronic components, which can greatly reduce the risk of failure. , the structure can be simplified, the performance is stable and reliable, and the motor can be automatically controlled in real time to provide auxiliary power. The structure is simple and easy to implement. A power-assist bike with a shifting system.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A speed change system with a deformable torsion sensing structure, comprising a pedal through shaft, a first gear, a second gear, a third gear, a deformable bracket, a motor, a controller and a casing; wherein, the pedal through shaft The first gear and the third gear are arranged in the casing and are sleeved on the pedal shaft; the second gear is arranged in the casing In the body, it is meshed with the first gear and the third gear, and one end of the second gear is rotatably mounted on the casing, and the other end is mounted on the casing through a deformation bracket, the deformation bracket is on the output gear plate through the third gear. The gear is deformed when it transmits the reaction force to the first gear and the second gear; the deformation part of the deformation bracket is provided with a strain gauge, and the signal output end of the strain gauge is signal-connected with the controller arranged in the casing, and when the deformation is performed When the bracket is deformed, the strain value is transmitted to the controller; the controller is signal-connected to the motor arranged in the housing, and controls the motor to provide auxiliary power when receiving the deformation signal of the strain gauge.

Further, one end face of the second gear mounted on the deformation bracket is provided with a magnet), and a Hall element is provided inside the housing, and the Hall element faces the magnet to form a speed sensor together.

Further, the deformable bracket includes a bracket main body, the peripheral side of the bracket main body has two or more connecting arms that can be deformed by force, the two or more connecting arms are fixed on the shell, and the other end of the bracket main body is It is rotatably mounted on the bracket body, and the strain gauge is arranged on one of the connecting arms.

Further, the inner side of the bracket body has a mounting recess, and one end of the second gear is rotatably mounted in the mounting recess.

Further, both ends of the second gear are respectively rotatably mounted on the housing and the bracket body through a first bearing and a second bearing, and the second bearing is arranged in the mounting recess.

Further, the bottom of the mounting recess is provided with a through hole penetrating the main body of the bracket, and the through hole faces the magnet.

Further, the mounting recess and the through hole are coaxial with the magnet and the second gear.

Further, the bracket body and the connecting arm are made of elastic recovery material and are an integrated structure.

Further, a third bearing is provided at one end of the pedal shaft passing through the casing, the other end passing through the output part of the motor and then extending out of the casing, and the output part is rotatably inside the casing through the fourth bearing.

A power-assisted bicycle includes a vehicle body, the vehicle body is provided with the speed change system with a deformable torsion sensing structure according to any one of claims 1 to 9, a battery pack provided on the vehicle body and a deformation The controller of the speed change system with the torque sensing structure is connected with the motor to supply driving electric energy; the output gear plate of the speed change system is drivingly connected with the rear wheels on the vehicle body.

The present invention mainly has the following beneficial effects:

The invention can not only greatly reduce the risk of failure, but also simplify the structure, and make the speed change system The performance is stable and reliable, and the motor is automatically controlled in real time to provide auxiliary power by detecting the deformation bracket, without manual manual operation, which makes riding easier and more comfortable, and also improves the riding pleasure, and the transmission system has a simple structure, It is easy to implement and is conducive to popularization and use.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of a transmission system with a deformed torsion sensing structure according to the present invention;

FIG. 2 is another structural schematic diagram of an embodiment of a transmission system with a deformation-type torsion sensing structure according to the present invention.

detailed description

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

As shown in Figures 1 and 2:

A speed change system with a deformed torsion sensing structure according to an embodiment of the present invention includes a pedal shaft 1, a first gear 2, a second gear 3, a third gear 4, a deformable bracket 5, and a motor (not shown in the figure). shown), the controller (not shown in the figure) and the housing 6. The pedal shaft 1 is rotatably passed through the inside of the casing 6, and both ends protrude out of the casing 6; the first gear 2 and the third gear 4 are arranged in the casing 6 and sleeved on the casing 6. on the pedal shaft 1; the second gear 3 is arranged in the housing 6 and is meshed with the first gear 2 and the third gear 3, and one end of the second gear 3 is rotatably mounted on the housing 6, The other end is installed on the casing 6 through the deformation bracket 5, and a strain gauge 7 is provided at the deformation of the deformation bracket 5, and the signal output end of the strain gauge 7 is connected with the signal of the controller arranged in the casing 6 (strain gauge). The signal output end of the chip 7 is preferably directly connected to the controller by means of a cable. ), the controller is connected to the motor signal arranged in the housing 6 .

Wherein, one end of the pedal shaft 1 is provided with a third bearing 11 through the casing 6, and the other end passes through the output part 8 of the motor and then extends out of the casing 6, and the output part 8 is connected to the pedal. A rotary oil seal 12 is provided between the through shafts 1, and the output part 8 is rotatably inside the housing 6 through a fourth bearing 13; the deformable bracket 5 includes a bracket main body 51, and the peripheral side of the bracket main body 51 has two receiving parts. A force-deformable connecting arm 52 (it may also have more than two connecting arms 52), the two connecting arms 52 are fixed on the housing 6 (for example, they can be fixed on the housing 6 by fasteners such as bolts 55), and The bracket main body 51 and the connecting arm 52 are made of elastic recovery material (such as aluminum alloy), which is an integrated structure; the other end of the bracket main body 51 is rotatably installed on the bracket main body 51, and the strain gauge 7 It is arranged on one of the connecting arms 52; the inner side of the bracket body 51 has a mounting recess 53, and one end of the second gear 3 is rotatably installed in the mounting recess 53. Specifically, the second gear 3 Both ends of the bracket are rotatably mounted on the housing 6 and the bracket main body 51 through the first bearing 31 and the second bearing 32 respectively, and the second bearing 32 is arranged in the mounting recess 53 .

When the speed change system with the deformable torque sensing structure of the present invention works, when the deformable bracket 5 is deformed when the output gear plate transmits the reaction force to the first gear 2 and the second gear 3 through the third gear 4, and then strain The signal output end of the sheet 7 is connected to the controller set in the casing 6 for signal connection, and when the deformation bracket 5 is deformed, the strain value is transmitted to the controller, and then the controller controls the motor after receiving the deformation signal of the strain gauge 7 Provide auxiliary power.

In this way, the speed change system with the deformation type torque sensing structure according to the present invention directly attaches the strain gauge to the easily deformable part of the deformation bracket 5 and transmits the signal directly to the controller without passing any electronic components in the middle. , which can not only greatly reduce the risk of failure, but also simplify the structure, so that the performance of the transmission system is stable and reliable, and by detecting the deformation bracket 5 to automatically control the motor in real time to provide auxiliary power, without manual manual operation, making riding easier , more comfortable, and also improve riding fun, the speed change system is simple in structure, easy to implement, and is conducive to popularization and use.

As shown in FIG. 2 , one end face of the second gear 3 mounted on the deformable bracket 5 is provided with a magnet 9 . 54 is opposite to the magnet 9, and the mounting recess 53 and the through hole 54 are coaxial with the magnet 9 and the second gear 3; the inside of the housing 6 is provided with a Hall element 10, which is opposite to the Hall element 10. The magnets 9 together form a speed sensor. When the rider pedals, the pedal through shaft 1 rotates, which drives the first gear 2 to rotate, which in turn drives the second gear 3 to rotate. 1 speed, get the pedal speed (RPM) signal, and send it to the controller, so as to control the speed of the motor to ensure that the speed change is more stable and reliable.

The speed change system with the deformable torsion sensing structure of the present invention can be applied to a power-assisted bicycle, and the specific structure can be as follows: the power-assisted bicycle includes a vehicle body, and the vehicle body has any one of claims 1 to 9 on the vehicle body. The speed change system with the deformation type torsion sensing structure, the battery pack provided on the vehicle body is connected with the controller and the motor of the speed change system with the deformation type torque sensing structure to supply driving electric energy; the speed change system The output chainring is drivingly connected to the rear wheels on the vehicle body.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made, and these improvements and modifications may also be regarded as It is the protection scope of the present invention.

Claims

A speed change system with a deformable torque sensing structure, characterized in that it comprises a pedal through shaft (1), a first gear (2), a second gear (3), a third gear (4), a deformable bracket ( 5), a motor, a controller and a casing (6); wherein the pedal shaft (1) is rotatably passed through the interior of the casing (6), and both ends protrude out of the casing (6) ; the first gear (2) and the third gear (4) are arranged in the casing (6) and sleeved on the pedal shaft (1); the second gear (3) is arranged in the casing (6). 6) inside and meshingly connected with the first gear (2) and the third gear (3), and one end of the second gear (3) is rotatably mounted on the housing (6), and the other end passes through the deformation bracket (5) Installed on the housing (6), the deformation bracket (5) is deformed when the output toothed plate transmits the reaction force to the first gear (2) and the second gear (3) through the third gear (4); the A strain gauge (7) is provided at the deformation position of the deformation bracket (5), and the signal output end of the strain gauge (7) is signal-connected with a controller arranged in the housing (6), and generates a signal generated at the deformation bracket (5). During deformation, the strain value is transmitted to the controller; the controller is signal-connected to the motor arranged in the housing (6), and controls the motor to provide auxiliary power when receiving the deformation signal of the strain gauge (7).
The speed change system with a deformation-type torque sensing structure according to claim 1, characterized in that: a magnet (9) is provided on one end face of the second gear (3) mounted on the deformation bracket (5), and the casing The inside of the body (6) is provided with a Hall element (10), and the Hall element (10) faces the magnet (9), which together constitute a speed sensor.
The speed change system with a deformed torsion sensing structure according to claim 2, characterized in that: the deformable bracket (5) comprises a bracket body (51), and the peripheral side of the bracket body (51) has more than two receiving A force-deformable connecting arm (52), two or more of the connecting arms (52) are fixed on the housing (6), and the other end of the bracket body (51) is rotatably mounted on the bracket body (51) , the strain gauge (7) is arranged on one of the connecting arms (52).
The speed change system with a deformation torque sensing structure according to claim 3, characterized in that: the inner side of the bracket body (51) has a mounting recess (53), and one end of the second gear (3) is rotatable installed in the mounting recess (53).
The speed change system with a deformation-type torque sensing structure according to claim 4, characterized in that: the two ends of the second gear (3) are rotatable through the first bearing (31) and the second bearing (32) respectively. It is installed on the housing (6) and the bracket body (51), and the second bearing (32) is arranged in the installation recess (53).
The speed change system with a deformation-type torque sensing structure according to claim 4, characterized in that: the bottom of the mounting recess (53) is provided with a through hole (54) penetrating the bracket body (51), the through hole (54) against the magnet (9).
The speed change system with a deformed torsion sensing structure according to claim 6, characterized in that: the mounting recess (53), the through hole (54) are coaxial with the magnet (9) and the second gear (3) .
The speed change system with a deformable torsion sensing structure according to any one of claims 1-7, characterized in that: the bracket body (51) and the connecting arm (52) are made of elastic recovery material and are an integrated structure .
The speed change system with a deformable torsion sensing structure according to any one of claims 1-7, characterized in that a third bearing is provided where one end of the pedal shaft (1) passes through the housing (6). (11), the other end extends out of the casing (6) after passing through the output part (8) of the motor, and the output part (8) is rotatably inside the casing (6) through the fourth bearing (13).
A power-assisted bicycle, characterized in that: it includes a vehicle body, the vehicle body is provided with the speed change system with a deformable torque sensing structure according to any one of claims 1 to 9, and a battery is provided on the vehicle body. The group is conductively connected with the controller and the motor of the speed change system with the deformable torque sensing structure to supply driving electric energy; the output gear plate of the speed change system is drivingly connected with the rear wheels on the vehicle body.