Pedal frequency sensing device and electric moped

Abstract

The utility model belongs to the technical field of electric mopeds, and discloses a pedaling frequency sensing device and an electric moped.The pedaling frequency sensing device comprises a sensing module and a rotating disc, the sensing module comprises a Hall effect sensor and a fixing support, the Hall effect sensor is installed on the fixing support, and the fixing support is used for being connected with a shell of a middle motor; the Hall effect sensor is used for being electrically connected with a control panel of the middle motor, a plurality of magnets distributed in the circumferential direction of the rotating disc at intervals are arranged on the rotating disc, and a middle shaft of the middle motor is sleeved with the rotating disc. The pedaling frequency sensing device is convenient to install, good in installation stability and high in pedaling frequency detection precision.

Description

Technical Field

[0001] The utility model relates to the technical field of electric assist bicycles, in particular to a cadence sensing device and an electric assist bicycle. Background Art

[0002] In an electric assist bicycle (E-BIKE), the cadence sensor configured in the mid-drive motor is a key component. It is responsible for monitoring the frequency at which the rider pedals the foot pedal and adjusting the assistance provided by the motor accordingly. Common cadence sensors use Hall effect sensors, which determine the cadence by detecting the magnetic field changes generated by the rotation of a magnet installed on the pedal crank or chainring. When the magnet rotates past the sensor as the foot pedal rotates, an electrical signal is generated, and the sensor calculates the cadence based on this. The electric assist bicycle can then achieve more intelligent assistance adjustment according to the cadence. For example, when the rider's cadence increases, indicating a need for more power to accelerate, the assistance provided by the motor will also increase accordingly; conversely, if the cadence slows down, the assistance will also decrease to maintain a natural and smooth ride.

[0003] In the prior art, the magnet is directly installed on the pedal crank or chainring, which is not convenient for installation. Moreover, due to limited installation space, the number of magnets cannot be too many. With fewer magnets, the magnetic field changes generated during rotation are relatively small, which is not conducive to the Hall effect sensor to sense, thus reducing the cadence detection accuracy. In the prior art, the Hall sensor is installed on the frame, and its stability is not high, which also reduces the cadence detection accuracy. Summary of the Utility Model

[0004] The first object of the utility model is to provide a cadence sensing device, which is relatively convenient to install, has good installation stability, and high cadence detection accuracy.

[0005] The second object of the utility model is to propose an electric assist bicycle, which has high cadence detection accuracy. By precisely matching the rider's cadence and force, the electric assist bicycle can use battery energy more efficiently and extend the battery life.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The utility model discloses a cadence sensing device, including: an induction module, the induction module includes a Hall effect sensor and a fixed bracket, the Hall effect sensor is installed on the fixed bracket, the fixed bracket is used to be connected to the outer shell of the mid-drive motor, and the Hall effect sensor is used to be electrically connected to the control board of the mid-drive motor; a rotating disk, on which a plurality of magnets are arranged at intervals along its circumferential direction, and the rotating disk is sleeved on the central shaft of the mid-drive motor.

[0008] In some embodiments, at least one connection hole is provided on the fixing bracket, and a connecting member passes through the connection hole and is connected to the housing to fix the fixing bracket to the housing.

[0009] In some embodiments, an avoidance notch is provided on the fixing bracket, and the avoidance notch is used to avoid the connecting ear of the housing.

[0010] In some embodiments, the Hall effect sensor includes a Hall element and a signal wire harness. One end of the signal wire harness is connected to the Hall element, and the other end has a plug terminal, and the plug terminal is plugged and connected to the socket on the control board; the Hall element is plugged into the fixing hole on the fixing bracket.

[0011] In some embodiments, a plurality of mounting grooves are provided on the rotating disk at intervals along its circumferential direction, and the plurality of mounting grooves are arranged in one-to-one correspondence with the plurality of magnets.

[0012] In some specific embodiments, glue is filled in the mounting groove to fix the magnet in the mounting groove.

[0013] In some embodiments, the rotating disk includes a metal bushing and an insulating outer disk. The metal bushing passes through the insulating outer disk, and the magnet is mounted on the insulating outer disk, and the metal bushing is sleeved on the central shaft.

[0014] In some embodiments, a keyway is provided on the metal bushing, and the metal bushing is connected to the central shaft through a connecting key fitted in the keyway.

[0015] In some specific embodiments, the pedal frequency sensing device further includes two snap rings, both of the two snap rings are clamped on the central shaft, and the two snap rings respectively abut against both ends of the metal bushing along its axial direction.

[0016] The present utility model also discloses an electric assist bicycle, which includes a vehicle body, a mid-drive motor and the pedal frequency sensing device described above. The vehicle body has pedals, the central shaft of the mid-drive motor is connected to the pedals, and the pedal frequency sensing device is used to detect the pedal frequency of the pedals.

[0017] Advantages of the cadence sensing device of the present utility model: The Hall effect sensor is fixed on the fixed bracket, and the fixed bracket is fixed on the outer shell of the mid-drive motor. The surface of the outer shell of the mid-drive motor has sufficient installation and operation space, which can not only ensure the convenience of installing the sensing module, but also ensure that the Hall effect sensor is stably installed on the electric assist vehicle, thus being beneficial to improving the cadence detection accuracy. At the same time, since multiple magnets are installed on the rotating disk, and the rotating disk is sleeved on the central shaft of the mid-drive motor, during the actual installation process, first install multiple magnets on the rotating disk, and then install the rotating disk on the central shaft of the mid-drive motor. The installation is very convenient, and the multiple magnets provided are beneficial to the Hall effect sensor to detect the magnetic field, thereby improving the cadence detection accuracy.

[0018] Advantages of the electric assist vehicle of the present utility model: Due to having the cadence sensing device described above, the sensing module of the cadence sensing device is installed on the outer shell of the mid-drive motor, and the rotating disk with multiple magnets installed is installed on the central shaft of the mid-drive motor. It can not only be conveniently installed, but also the multiple magnets provided are beneficial to the Hall effect sensor to detect the magnetic field, improving the cadence detection accuracy. By precisely matching the rider's cadence and strength, this electric assist vehicle can use the battery energy more efficiently and extend the cruising range.

[0019] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic installation structure diagram of the cadence sensing device and the mid-drive motor according to an embodiment of the present utility model;

[0021] Figure 2 is a partial schematic diagram of the installation structure of the cadence sensing device and the mid-drive motor according to an embodiment of the present utility model;

[0022] Figure 3 is an exploded structure diagram of the installation structure of the cadence sensing device and the mid-drive motor according to an embodiment of the present utility model;

[0023] Figure 4 is Figure 3 a partial enlarged schematic diagram of the structure shown;

[0024] Figure 5 is an exploded structure diagram of the rotating disk and the central shaft according to an embodiment of the present utility model.

[0025] Reference numerals:

[0026] 100, sensing module; 110, Hall effect sensor; 111, Hall element; 112, signal wire harness; 1121, plug-in terminal; 120, fixed bracket; 121, avoidance notch;

[0027] 200, Rotary Disk; 210, Metal Bush; 211, Keyway; 220, Insulating Outer Disk; 221, Mounting Groove;

[0028] 300, Magnet; 400, Connector; 500, Connecting Key; 600, Snap Ring;

[0029] 700, Outer Shell; 710, Bottom Shell; 720, Cover Shell; 701, Positioning Boss; 702, Connecting Ear;

[0030] 800, Control Board; 900, Central Axis; 910, Card Slot. Detailed Embodiment

[0031] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0032] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal height than the second feature.

[0034] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] The present utility model discloses a cadence sensing device. Referring to Figure 1 - Figure 2 as shown, the cadence sensing device includes a sensing module 100 and a rotating disk 200. The sensing module 100 includes a Hall effect sensor 110 and a fixing bracket 120. The Hall effect sensor 110 is installed on the fixing bracket 120. The fixing bracket 120 is used to be connected to the housing 700 of the mid-drive motor. The Hall effect sensor 110 is used to be electrically connected to the control board 800 of the mid-drive motor. A plurality of magnets 300 are arranged on the rotating disk 200 at intervals along its circumferential direction. The rotating disk 200 is sleeved on the central shaft 900 of the mid-drive motor. It can be understood that the Hall effect sensor 110 is fixed on the fixing bracket 120, and the fixing bracket 120 is fixed on the housing 700 of the mid-drive motor. The surface of the housing 700 of the mid-drive motor has sufficient installation and operation space, which can not only ensure the convenience of installing the sensing module 100, but also ensure that the Hall effect sensor 110 is stably installed on the electric assist vehicle, thus being beneficial to improving the cadence detection accuracy. At the same time, since a plurality of magnets 300 are installed on the rotating disk 200 and the rotating disk 200 is sleeved on the central shaft 900 of the mid-drive motor, in the actual installation process, first install the plurality of magnets 300 on the rotating disk 200, and then install the rotating disk 200 on the central shaft 900 of the mid-drive motor. The installation is very convenient, and the plurality of magnets 300 arranged are beneficial to the Hall effect sensor 110 to detect the magnetic field, thus improving the cadence detection accuracy.

[0036] Referring to Figure 3 - Figure 4 as shown, two connection holes are provided on the fixing bracket 120. The connecting member 400 passes through the connection holes and is connected to the housing 700 to fix the fixing bracket 120 to the housing 700. Two positioning bosses 701 protrude from the edge of the housing 700, and the positioning bosses 701 are connected to the connecting member 400. Connecting the fixing bracket 120 and the housing 700 through the connecting member 400 can achieve a stable and reliable connection of the fixing bracket 120, and the positioning and installation accuracy is relatively high. In other embodiments of the present utility model, the number of connection holes on the fixing bracket 120 can also be one, three, four or more, which can be specifically selected according to actual needs and is not limited to the above description. In addition, in this embodiment, the connecting member 400 is a screw. In other embodiments of the present utility model, the connecting member 400 can also be other connection structural members such as a fixing pin.

[0037] It should be added that in other embodiments of the present utility model, the fixing bracket 120 can also be connected to the housing 700 by other connection methods such as welding, bonding, snap connection, etc., and is not limited to the foregoing limitations.

[0038] Reference Figure 3 - Figure 4 As shown, the fixing bracket 120 is provided with an avoidance notch 121 for avoiding the connection ear 702 of the housing 700. It can be understood that the housing 700 generally includes a bottom shell 710 and a cover shell 720, and connection ears 702 are provided on both the bottom shell 710 and the cover shell 720. The bottom shell 710 and the cover shell 720 are connected by connection bolts passing through the connection ears 702. The avoidance notch 121 is provided on the fixing bracket 120 to avoid the connection bolts on the connection ears 702, prevent interference between the connection bolts and the fixing bracket 120, and ensure that the induction module 100 can be stably and conveniently installed on the housing 700.

[0039] Optionally, the fixing bracket 120 is a two-sided flat plate structure, which is convenient for processing and manufacturing and reduces the manufacturing cost of the fixing bracket 120. Of course, in other embodiments of the present utility model, the shape of the fixing bracket 120 can be selected according to actual needs and is not limited to the plate-like structure.

[0040] Reference Figure 3 - Figure 4 As shown, the Hall effect sensor 110 includes a Hall element 111 and a signal wire harness 112. One end of the signal wire harness 112 is connected to the Hall element 111, and the other end has a plug terminal 1121, which is plugged into the socket on the control board 800; the Hall element 111 is plugged into the fixing hole on the fixing bracket 120. It can be understood that one end of the signal wire harness 112 is connected to the Hall element 111, and the other end has a plug terminal 1121. After the plug terminal 1121 is inserted into the socket on the control board 800, the signal sensed by the Hall element 111 can be transmitted to the control board 800 in real time, so as to realize that the control board 800 collects the signal of the rotating disk 200 of the central shaft 900 in real time, thereby calculating the pedaling frequency signal of the human foot acting on the central shaft 900, facilitating the control board 800 to input different assist currents into the mid-drive motor and realizing the control of the assist power of the mid-drive motor. At the same time, the Hall element 111 passes through the fixing hole on the fixing bracket 120 for positioning and is connected to the fixing bracket 120 by screws, ensuring the installation stability of the Hall element 111 while facilitating the connection between the Hall element 111 and the fixing bracket 120.

[0041] Reference Figure 5As shown, a plurality of mounting grooves 221 are provided on the rotating disk 200 at intervals along its circumferential direction, and the plurality of mounting grooves 221 are arranged in one-to-one correspondence with the plurality of magnets 300. It can be understood that mounting the magnet 300 in the mounting groove 221 can ensure the mounting stability of the magnet 300, thereby avoiding the phenomenon that the magnet 300 flies out from the rotation and reducing the accuracy of the cadence test.

[0042] Optionally, the mounting groove 221 is filled with glue to fix the magnet 300 in the mounting groove 221. It can be understood that during the actual installation process, the magnet 300 is correspondingly mounted in the mounting groove 221, and the two are fixed by pressing. Anaerobic glue can be injected into the mounting groove 221 to prevent the magnet 300 from loosening.

[0043] Optionally, the magnet 300 is made of a magnetic steel, which can reduce the manufacturing cost. Of course, in other embodiments of the present invention, the magnet 300 can also be selected from other magnetic components. It should be added that in the embodiments of the present invention, the number, shape, size, and type of the magnet 300 can be selected according to actual detection needs and manufacturing cost considerations.

[0044] Reference Figure 5 As shown, the rotating disk 200 includes a metal bushing 210 and an insulating outer disk 220. The metal bushing 210 passes through the insulating outer disk 220, and the magnet 300 is mounted on the insulating outer disk 220. The metal bushing 210 is sleeved on the central shaft 900. It can be understood that the rotating disk 200 is composed of a metal bushing 210 in the middle and an insulating outer disk 220 on the outside. The metal bushing 210 in the middle is mounted on the central shaft 900 of the central motor to ensure reliable axial positioning. The insulating outer disk 220 is convenient for integral injection molding of the mold, with low processing and manufacturing costs and good stability.

[0045] Optionally, the metal bushing 210 is an aluminum bushing, and the insulating outer disk 220 is a nylon disk. Thus, it is beneficial to reduce the manufacturing cost of the rotating disk 200, thereby reducing the manufacturing cost of the entire cadence sensing device. In other embodiments of the present invention, the metal bushing 210 and the insulating outer disk 220 can also be made of other materials according to actual needs, not limited to the above limitations.

[0046] Optionally, a keyway 211 is provided on the metal bushing 210, and the metal bushing 210 is connected to the central shaft 900 through a connection key 500 fitted in the keyway 211. The connection between the central shaft 900 and the metal bushing 210 is realized through the connection key 500, which can not only facilitate assembly but also prevent the metal bushing 210 from rotating relative to the central shaft 900, thus being beneficial to ensuring the cadence detection accuracy.

[0047] Optionally, the pedal frequency sensing device further includes two circlips 600. Both of the two circlips 600 are snap-fitted into the slot 910 of the bottom bracket 900, and the two circlips 600 respectively abut against the two ends of the metal bushing 210 along its axial direction. It can be understood that the movement of the metal bushing 210 along the axial direction of the bottom bracket 900 is restricted by the two circlips 600 installed on the bottom bracket 900, avoiding the axial play of the rotating disc 200 along the bottom bracket 900 during the actual working process, which is beneficial to ensuring the pedal frequency detection accuracy. In other embodiments of the present invention, the specific material and model of the circlip 600 can be selected according to actual needs.

[0048] It should be additionally noted that, in other embodiments of the present invention, the rotating disc 200 can be directly welded to the bottom bracket 900 or installed on the bottom bracket 900 by interference fit. That is to say, in other embodiments of the present invention, the connection manner between the rotating disc 200 and the bottom bracket 900 can be adjusted according to actual needs and is not limited to the above-mentioned limitations.

[0049] The present invention also discloses an electric assist bicycle, which includes a vehicle body, a mid-drive motor and the foregoing pedal frequency sensing device. The vehicle body has pedals, the bottom bracket 900 of the mid-drive motor is connected to the pedals, and the pedal frequency sensing device is used to detect the pedal frequency of the pedals. Due to the foregoing pedal frequency sensing device, the sensing module 100 of the pedal frequency sensing device is installed on the outer shell 700 of the mid-drive motor, and the rotating disc 200 installed with a plurality of magnets 300 is installed on the bottom bracket 900 of the mid-drive motor. It is not only convenient for installation, but also the plurality of magnets 300 provided are beneficial to the detection of the magnetic field by the Hall effect sensor 110, improving the pedal frequency detection accuracy. By precisely matching the pedal frequency and force of the rider, the electric assist bicycle can use the battery energy more efficiently and extend the battery life.

[0050] In the description of this specification, the descriptions referring to the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0051] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A cadence sensing device, characterized in that, Comprising: An induction module (100), the induction module (100) includes a Hall effect sensor (110) and a fixing bracket (120), the Hall effect sensor (110) is installed on the fixing bracket (120), and the fixing bracket (120) is used to connect to the housing (700) of the mid-drive motor, and the Hall effect sensor (110) is used to be electrically connected to the control board (800) of the mid-drive motor; A rotating disk (200), on which a plurality of magnets (300) are arranged at intervals along its circumference, and the rotating disk (200) is sleeved on the central shaft (900) of the mid-drive motor.

2. The pedal frequency sensing device according to claim 1, wherein At least one connecting hole is provided on the fixing bracket (120), and a connecting member (400) passes through the connecting hole and is connected to the housing (700) to fix the fixing bracket (120) to the housing (700).

3. The pedal frequency sensing device according to claim 1, wherein An avoidance notch (121) is provided on the fixing bracket (120), and the avoidance notch (121) is used to avoid the connecting ear (702) of the housing (700).

4. The cadence sensing device according to claim 1, wherein The Hall effect sensor (110) includes a Hall element (111) and a signal wire harness (112), one end of the signal wire harness (112) is connected to the Hall element (111), and the other end has a plug terminal (1121), and the plug terminal (1121) is plugged and connected to the socket on the control board (800); the Hall element (111) is plugged into the fixing hole on the fixing bracket (120).

5. The pedal frequency sensing device according to claim 1, characterized in that A plurality of mounting grooves (221) are provided on the rotating disk (200) at intervals along its circumference, and the plurality of mounting grooves (221) are arranged in one-to-one correspondence with the plurality of magnets (300).

6. The pedal cadence sensing device according to claim 5, wherein The mounting groove (221) is filled with glue to fix the magnet (300) in the mounting groove (221).

7. The cadence sensing device according to any one of claims 1-6, characterized in that The rotating disk (200) includes a metal bushing (210) and an insulating outer disk (220), the metal bushing (210) passes through the insulating outer disk (220), and the magnet (300) is installed on the insulating outer disk (220), and the metal bushing (210) is sleeved on the central shaft (900).

8. The cadence sensing device according to claim 7, wherein A keyway (211) is provided on the metal bushing (210), and the metal bushing (210) is connected to the central shaft (900) through a connection key (500) fitted in the keyway (211).

9. The cadence sensing device according to claim 7, wherein The pedal frequency sensing device further includes two snap rings (600), both of the two snap rings (600) are snap-fitted on the central shaft (900), and the two snap rings (600) respectively abut against both ends of the metal bushing (210) along its axial direction.

10. An electric assist vehicle, characterized in that, Comprising a vehicle body, a mid-drive motor and the pedal frequency sensing device according to any one of claims 1-9, the vehicle body has a pedal, the central shaft (900) of the mid-drive motor is connected to the pedal, and the pedal frequency sensing device is used to detect the pedal frequency.

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