Assisted bicycle middle shaft torque sensor and middle motor

Abstract

The utility model discloses a middle shaft torque sensor and a middle motor of a power-assisted bicycle, and belongs to the field of middle motors of power-assisted bicycles. The utility model relates to a torque sensor for a center shaft of a power-assisted bicycle, which comprises a shaft sleeve which is sleeved on the center shaft and is used for transmitting torque, a moving part which rotates together with the shaft sleeve, a static part which is oppositely attached to the moving part, and a torque deformation sheet which is arranged on the shaft sleeve and is used for sensing the magnitude of the torque borne by the shaft sleeve, the static part is arranged on the outer side of the shaft sleeve in a sleeving mode and coaxially installed on the moving part in a rotating mode to form an integral structural part, the shaft sleeve arranged on the middle shaft in a sleeving mode and the torque deformation piece on the shaft sleeve are used for sensing the torque borne by the shaft sleeve, and torque signals are processed and transmitted through coil chip sets of the moving part and the static part. The whole center shaft torque sensor is self-contained, compact in structure and convenient to install, can be installed and used on a large-diameter spline head center shaft, and meets the high-power and high-torque output requirements of a center motor.

Description

Technical Field

[0001] The utility model relates to a torque sensor, and more specifically to a central axis torque sensor and a central motor of a power-assisted bicycle. Background Art

[0002] A power-assisted bicycle is a new type of vehicle that uses an electric motor to assist riding. When riding on flat ground, the output power of the motor is very small, which makes people feel easy to ride and saves electricity. However, when going uphill, it can output a large torque to make climbing very effortless. In recent years, it has been loved by many consumers.

[0003] Torque sensors are a key component of power-assisted bicycles, adjusting the motor's output power based on the torque applied to the bicycle's bottom bracket. With increasing demand for assisted riding power on power-assisted bicycles, particularly in Europe and the United States, conventional square-head bottom brackets are no longer able to meet these high-power output requirements, and are being replaced by larger-diameter spline-head bottom brackets (i.e., ISIS bottom brackets). Because the bottom bracket tube size of a bicycle is relatively fixed, the mounting space for the bottom bracket torque sensor is further compressed as the bottom bracket diameter increases. Most torque sensors with existing structural designs struggle to fit within the bottom bracket tube.

[0004] In addition, most existing mid-axle torque sensors directly use strain gauges to detect torque signals, which are then wirelessly transmitted to the motor control module through induction coils. However, since the strain gauges themselves have very small deformation and lack signal amplification capabilities, the torque output signals under low torque conditions are intermittent and unstable.

[0005] Based on the above problems of the existing middle shaft torque sensor, it is necessary to design a middle shaft torque sensor that can be installed in a smaller installation space and has a more stable torque signal output to meet the installation requirements of the modified mid-mounted motor on the five-way structure of a high-power power-assisted bicycle. Summary of the Invention

[0006] 1. Technical problems to be solved by the utility model

[0007] One purpose of the present invention is to overcome the shortcomings of existing middle shaft torque sensors that are large in size and difficult to meet the installation space requirements of large-diameter spline head middle shafts, and to provide a middle shaft torque sensor for power-assisted bicycles and a mid-mounted motor. The technical solution of the present invention is adopted, and a shaft sleeve and a torque deformation sheet on the shaft sleeve are used to sense the torque applied to the shaft sleeve, and the torque signal is processed and transmitted through the coil chip group of the moving part and the stationary part. The moving part and the stationary part are combined to form an integral structural part. The entire middle shaft torque sensor is self-contained, compact in structure, and easy to install. It can be installed and used on a large-diameter spline head middle shaft, meeting the high-power and high-torque output requirements of the mid-mounted motor.

[0008] Another purpose of the present invention is to solve the problem of poor stability in the torque signal output of the existing central axis torque sensor. Coils for data transmission and power transmission and processing chips are provided in both the moving side coil chipset and the stationary side coil chipset. The modulation and demodulation of the chip are used to amplify and transmit the torque signal, which greatly improves the stability of the torque signal output and improves the accuracy and stability of the central motor control.

[0009] 2. Technical solution

[0010] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is:

[0011] The utility model is a torque sensor for the central shaft of a power-assisted bicycle, comprising a sleeve for being mounted on the central shaft and transmitting torque, a moving part rotating together with the sleeve, a stationary part arranged in contact with the moving part, and a torque deformation piece arranged on the sleeve for sensing the magnitude of the torque applied to the sleeve, wherein:

[0012] The moving part is fixedly arranged on the shaft sleeve, and the stationary part is sleeved on the outside of the shaft sleeve and coaxially rotated and installed on the moving part to form an integral structural part. The moving part is provided with a moving side coil chipset, and the stationary part is provided with a stationary side coil chipset. The torque deformation sheet is electrically connected to the moving side coil chipset, and the stationary part has a lead wire electrically connected to the stationary side coil chipset.

[0013] Furthermore, the moving side coil chipset includes a moving side coil for data transmission and power transmission, and a signal operation chip for receiving and calculating the torque signal detected by the torque deformation plate, the moving side coil is electrically connected to the signal operation chip, and the torque deformation plate is electrically connected to the signal operation chip; the stationary side coil chipset includes a stationary side coil for data transmission and power transmission, and a signal amplification chip for amplifying the torque signal, and the stationary side coil is electrically connected to the signal amplification chip; data transmission and power transmission are performed between the moving side coil and the stationary side coil through the principle of wireless induction.

[0014] Furthermore, the moving part and the stationary part are interlocked and connected and can maintain relative rotation.

[0015] Furthermore, an inner wall of one end of the sleeve is provided with an inner spline for transmission connection with an outer spline on the central shaft.

[0016] Furthermore, an extension section for installing a one-way clutch is provided on the end of the sleeve away from the internal spline.

[0017] The utility model relates to a mid-mounted motor for a power-assisted bicycle. The mid-mounted motor for the power-assisted bicycle is equipped with the above-mentioned mid-mounted torque sensor for the power-assisted bicycle. A transmission gear is installed at one end of the mid-mounted motor via a bearing. A one-way clutch is provided between the transmission gear and the shaft sleeve. The transmission gear is connected to the power-assisted motor via an intermediate gear set. The lead-out wire of the stationary part is connected to the motor controller of the power-assisted motor.

[0018] Furthermore, the center shaft is a spline head center shaft.

[0019] Furthermore, the minimum outer diameter D of the central axis is 20-22 mm.

[0020] 3. Beneficial effects

[0021] Compared with the existing known technologies, the technical solution provided by the present invention has the following beneficial effects:

[0022] (1) The utility model relates to a torque sensor for the central shaft of an assisted bicycle, which comprises a sleeve for being mounted on the central shaft and transmitting torque, a moving part rotating together with the sleeve, a stationary part arranged in close contact with the moving part, and a torque deformation sheet arranged on the sleeve for sensing the magnitude of the torque applied to the sleeve. The moving part is fixedly mounted on the sleeve, and the stationary part is mounted on the outer side of the sleeve and coaxially rotated on the moving part to form an integral structural part. The sleeve mounted on the central shaft and the torque deformation sheet on the sleeve are used to sense the magnitude of the torque applied to the sleeve, and the coil chip group of the moving part and the stationary part is used to realize the processing and transmission of the torque signal. The entire central shaft torque sensor is self-contained, compact in structure, and easy to install. It can be installed and used on a central shaft with a large diameter spline head, meeting the high power and high torque output requirements of the central motor.

[0023] (2) The utility model relates to a power-assisted bicycle mid-axle torque sensor, wherein the moving side coil chipset includes a moving side coil for data transmission and power transmission, and a signal operation chip for receiving and operating the torque signal detected by the torque deformation plate; the stationary side coil chipset includes a stationary side coil for data transmission and power transmission, and a signal amplification chip for amplifying the torque signal. The modulation and demodulation of the chip are used to realize the amplification and transmission of the torque signal, thereby greatly improving the stability of the torque signal output and improving the accuracy and stability of the mid-mounted motor control;

[0024] (3) The utility model provides a power-assisted bicycle axle torque sensor, wherein the moving part and the stationary part are interlocked and connected and can maintain relative rotation, thereby ensuring the integrity and compactness of the moving part and the stationary part, facilitating overall installation and use, and reducing the probability of lowering the signal transmission stability due to installation errors and other reasons in the existing split installation structure, thereby further ensuring the transmission stability of the torque signal;

[0025] (4) The utility model is a torque sensor for the central shaft of a power-assisted bicycle. An inner spline is provided on the inner wall of one end of the sleeve for transmission connection with the outer spline on the central shaft. The spline structure is used to realize the transmission between the central shaft and the sleeve. The transmission is stable and reliable, the transmission torque is large, and the assembly is simple and convenient.

[0026] (5) The utility model relates to a torque sensor for the central shaft of a power-assisted bicycle. The end of the shaft sleeve away from the inner spline is provided with an extension section for mounting a one-way clutch. The one-way clutch is directly mounted on the shaft sleeve, which makes the structure simpler and more compact. The shaft sleeve of the integrated structure has high structural strength, thereby ensuring the service life of the central motor.

[0027] (6) The utility model relates to a mid-mounted motor for a power-assisted bicycle, wherein the mid-mounted torque sensor for the power-assisted bicycle is installed on the shaft, a transmission gear is installed at one end of the mid-mounted shaft through a bearing, a one-way clutch is provided between the transmission gear and the shaft sleeve, the transmission gear is connected to the power-assisted motor through an intermediate gear set, and the lead wire of the stationary part is connected to the motor controller of the power-assisted motor; the use of the mid-mounted torque sensor can make the structure of the mid-mounted motor more compact, reduce the overall weight of the mid-mounted motor, facilitate installation and use on the bottom bracket of the bicycle, and the torque signal transmission is stable, thereby ensuring the accuracy of the auxiliary work of the mid-mounted motor;

[0028] (7) The utility model provides a mid-mounted motor for a power-assisted bicycle, wherein the shaft is a splined head shaft, and the minimum outer diameter D of the shaft is 20 to 22 mm, thereby improving the output torque of the mid-mounted motor and meeting the modification needs of high-power power-assisted bicycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a plan view of the installation structure of a power-assisted bicycle middle shaft torque sensor on the middle shaft of the utility model;

[0030] Figure 2 This is a schematic diagram of the split structure of the middle shaft torque sensor and the middle shaft of a power-assisted bicycle of the present invention;

[0031] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure in the AA direction.

[0032] Explanation of the numbers in the schematic diagram:

[0033] 1. Torque sensor; 1-1. Bushing; 1-1a. Internal spline; 1-1b. Extension section; 1-2. Moving part; 1-2a. Moving-side coil; 1-2b. Signal processing chip; 1-3. Stationary part; 1-3a. Stationary-side coil; 1-3b. Signal amplification chip; 1-4. Torque deformation plate;

[0034] 2. Middle shaft; 2-1. External spline; 3. Transmission gear; 4. One-way clutch; 5. Bearing. DETAILED DESCRIPTION

[0035] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0036] [Example 1]

[0037] Combine Figures 1 to 3 As shown, a torque sensor for the middle shaft of a power-assisted bicycle in this embodiment includes a sleeve 1-1 for being mounted on the middle shaft 2 and transmitting torque, a moving part 1-2 rotating together with the sleeve 1-1, a stationary part 1-3 arranged in relative contact with the moving part 1-2, and a torque deformation piece 1-4 arranged on the sleeve 1-1 for sensing the magnitude of the torque applied to the sleeve 1-1. When riding, the torque generated by the middle shaft 2 is transmitted to the sleeve 1-1 and detected by the torque deformation piece 1-4. The torque signal detected by the torque deformation piece 1-4 is transmitted to the motor control system of the power-assisted bicycle through the moving part 1-2 and the stationary part 1-3, so as to provide riding assistance according to the magnitude of the torque. Unlike existing mid-axle torque sensors, the present embodiment of the power-assisted bicycle mid-axle torque sensor features a moving part 1-2 fixedly mounted on a sleeve 1-1, potentially integrated with the sleeve. A stationary part 1-3 is sleeved outside the sleeve 1-1 and coaxially rotates with the moving part 1-2, forming a single, integrated structure. The entire mid-axle torque sensor is self-contained, compact, and easy to install. During operation, the moving part 1-2 rotates with the sleeve 1-1, while the stationary part 1-3 remains relatively stationary. The sleeve 1-1, moving part 1-2, and stationary part 1-3 form a compact torque sensor body that can be installed on large-diameter splined mid-axles, meeting the high-power, high-torque output requirements of mid-mounted motors. The moving part 1-2 is provided with a moving side coil chipset, the stationary part 1-3 is provided with a stationary side coil chipset, the torque deformation piece 1-4 is electrically connected to the moving side coil chipset, and the stationary part 1-3 has a lead wire electrically connected to the stationary side coil chipset. The torque signal detected by the torque deformation piece 1-4 can be processed and transmitted through the coil chipsets of the moving part 1-2 and the stationary part 1-3, thereby ensuring the stability of the torque signal transmission.

[0038] Reference Figure 3As shown, in this embodiment, the moving-side coil chipset includes a moving-side coil 1-2a for data transmission and power transfer, and a signal calculation chip 1-2b for receiving and calculating the torque signal detected by the torque deformation plate 1-4. The moving-side coil 1-2a is electrically connected to the signal calculation chip 1-2b, and the torque deformation plate 1-4 is electrically connected to the signal calculation chip 1-2b. The stationary-side coil chipset includes a stationary-side coil 1-3a for data transmission and power transfer, and a signal amplification chip 1-3b for amplifying the torque signal. The stationary-side coil 1-3a is electrically connected to the signal amplification chip 1-3b. Data transmission and power transfer between the moving-side coil 1-2a and the stationary-side coil 1-3a are performed using wireless induction principles. By providing the signal calculation chip 1-2b and the signal amplification chip 1-3b, the torque signal is amplified and transmitted using chip modulation and demodulation, significantly improving the stability of the torque signal output and enhancing the accuracy and stability of the mid-mounted motor control.

[0039] like Figure 2 and Figure 3 As shown, in this embodiment, the moving part 1-2 and the stationary part 1-3 are interlocked and connected and can maintain relative rotation, which ensures the integrity and compactness of the moving part 1-2 and the stationary part 1-3, facilitates the overall installation and use, reduces the probability of reducing the signal transmission stability due to installation errors and other reasons in the existing split installation structure, and further ensures the transmission stability of the torque signal.

[0040] In this embodiment, preferably, an internal spline 1-1a is provided on the inner wall of one end of the sleeve 1-1 for transmission connection with the external spline 2-1 on the central shaft 2. This spline structure achieves transmission between the central shaft 2 and the sleeve 1-1, resulting in stable and reliable transmission, high transmission torque, and simple and convenient assembly. Furthermore, an extension 1-1b is provided on the end of the sleeve 1-1, distal from the internal spline 1-1a, for mounting a one-way clutch 4. The one-way clutch 4 can be a one-way ratchet clutch, with a transmission gear 3 mounted outside the one-way clutch 4. The extension 1-1b is integrally formed with the sleeve 1-1. During normal riding, the central shaft 2 drives the sleeve 1-1 to rotate together, at which point the one-way clutch 4 couples the extension 1-1b with the transmission gear 3, thereby driving the transmission gear 3 to rotate together. During motor-assisted riding, the motor directly drives the transmission gear 3 to rotate, at which point the reverse rotation of the sleeve 1-1 and the transmission gear 3 is decoupled by the one-way clutch 4, achieving a riding-assisting effect.

[0041] [Example 2]

[0042] This embodiment relates to a mid-mounted motor for a power-assisted bicycle. The torque sensor 1 of the aforementioned embodiment 1 is mounted on the central shaft 2 of the mid-mounted motor. A transmission gear 3 is mounted on one end of the central shaft 2 via a bearing 5. A one-way clutch 4 is provided between the transmission gear 3 and the shaft sleeve 1-1. The transmission gear 3 is connected to the power-assisted motor via an intermediate gear set. The lead wires of the stationary member 1-3 are connected to the motor controller of the power-assisted motor. The use of the aforementioned mid-shaft torque sensor can make the mid-mounted motor more compact, reduce its overall weight, and facilitate installation and use on the bicycle's bottom bracket. The torque signal transmission is stable, ensuring the accuracy of the mid-mounted motor's assisted operation.

[0043] In this embodiment, the center axle 2 is a splined center axle with external splines at both ends for connecting to the pedal arms. Furthermore, the minimum outer diameter D of the center axle 2 is 20-22 mm, which increases the output torque of the mid-mounted motor and meets the needs of high-power power-assisted bicycle modifications.

[0044] This utility model relates to a power-assisted bicycle mid-axle torque sensor and mid-mounted motor. It utilizes a sleeve mounted on the mid-axle and a torque-deformation plate mounted on the sleeve to sense the torque applied to the sleeve. The torque signal is processed and transmitted via coil chipsets in the moving and stationary components. The moving and stationary components form a single, integrated structure. The entire mid-axle torque sensor is compact and easy to install. It can be installed and used on a large-diameter splined mid-axle, meeting the high-power, high-torque output requirements of the mid-mounted motor. Furthermore, coils and processing chips for data transmission and power transfer are incorporated into both the moving and stationary coil chipsets. The chips utilize modulation and demodulation to amplify and transmit the torque signal, significantly improving the stability of the torque signal output and the accuracy and stability of the mid-mounted motor control.

[0045] The above schematically describes the present invention and its embodiments, which is not intended to be limiting. The accompanying drawings illustrate only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the spirit of the present invention, uninventively designs structures and embodiments similar to this technical solution, they shall fall within the scope of protection of the present invention.

Claims

1. A torque sensor for a power-assisted bicycle axle, comprising a sleeve (1-1) for being sleeved on a axle (2) and transmitting torque, a moving part (1-2) rotating together with the sleeve (1-1), a stationary part (1-3) arranged in close contact with the moving part (1-2), and a torque deformation sheet (1-4) arranged on the sleeve (1-1) for sensing the magnitude of the torque applied to the sleeve (1-1), characterized in that: The moving part (1-2) is fixedly arranged on the shaft sleeve (1-1), and the stationary part (1-3) is sleeved on the outside of the shaft sleeve (1-1) and coaxially rotatably mounted on the moving part (1-2) to form an integral structural part. The moving part (1-2) is provided with a moving side coil chip group, and the stationary part (1-3) is provided with a stationary side coil chip group. The moment deformation sheet (1-4) is electrically connected to the moving side coil chip group, and the stationary part (1-3) has a lead wire electrically connected to the stationary side coil chip group.

2. The power-assisted bicycle bottom shaft torque sensor according to claim 1, characterized in that: The moving side coil chipset comprises a moving side coil (1-2a) for data transmission and power transmission, and a signal operation chip (1-2b) for receiving and operating a torque signal detected by a torque deformation sheet (1-4), wherein the moving side coil (1-2a) is electrically connected to the signal operation chip (1-2b), and the torque deformation sheet (1-4) is electrically connected to the signal operation chip (1-2b); the stationary side coil chipset comprises a stationary side coil (1-3a) for data transmission and power transmission, and a signal amplification chip (1-3b) for amplifying the torque signal, wherein the stationary side coil (1-3a) is electrically connected to the signal amplification chip (1-3b); data transmission and power transmission are performed between the moving side coil (1-2a) and the stationary side coil (1-3a) through the principle of wireless induction.

3. The power-assisted bicycle bottom shaft torque sensor according to claim 1, characterized in that: The moving part (1-2) and the stationary part (1-3) are mutually buckled and connected and can maintain relative rotation.

4. The power-assisted bicycle bottom shaft torque sensor according to claim 1, 2 or 3, characterized in that: An inner spline (1-1a) for transmission connection with an outer spline (2-1) on the central shaft (2) is provided on the inner wall of one end of the shaft sleeve (1-1).

5. The power-assisted bicycle bottom shaft torque sensor according to claim 4, characterized in that: An extension section (1-1b) for mounting a one-way clutch (4) is also provided on the end of the shaft sleeve (1-1) away from the internal spline (1-1a).

6. A mid-mounted motor for a power-assisted bicycle, characterized in that: The central shaft (2) of the central motor of the power-assisted bicycle is equipped with a central shaft torque sensor according to any one of claims 1 to 5; a transmission gear (3) is mounted on one end of the central shaft (2) via a bearing (5); a one-way clutch (4) is provided between the transmission gear (3) and the shaft sleeve (1-1); the transmission gear (3) is connected to the power-assisted motor via an intermediate gear set; and a lead wire of the stationary part (1-3) is connected to a motor controller of the power-assisted motor.

7. The mid-mounted motor for power-assisted bicycle according to claim 6, characterized in that: The center shaft (2) is a spline head center shaft.

8. The mid-mounted motor for power-assisted bicycle according to claim 7, characterized in that: The minimum outer diameter D of the central shaft (2) is 20-22 mm.

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