Pedal track adjusting mechanism of self-generating elliptical machine

Abstract

The utility model belongs to the technical field of elliptical machines, and particularly relates to a pedal track adjusting mechanism of a self-generating elliptical machine. A pedal track adjusting mechanism of a self-generating elliptical machine comprises a mechanical transmission module which comprises a transmission system linked with a pedal and a resistance system, the resistance system is mechanically connected with a generator, and the pedal drives the generator to generate electricity; the energy conversion module comprises an energy management device, the output end of the generator is connected with the energy management device, and the output end of the energy management device is connected with the storage battery and the push rod motor; the storage battery is connected with the energy management device through a bidirectional charging and discharging link; and the man-machine interaction module comprises a man-machine interaction input unit and a control system, and the control system controls the power supply proportion of the energy management device to the push rod motor and changes the working states of the resistance system and the push rod motor. The device has the advantages that high-efficiency energy conversion and dynamic distribution can be realized under the condition of self power generation, so that gradient adjustment is supported.

Description

Technical Field

[0001] This utility model belongs to the field of elliptical machine technology, and in particular relates to a pedal trajectory adjustment mechanism for a self-generating elliptical machine. Background Technology

[0002] The elliptical trainer is a comprehensive training machine, particularly suitable for beginners or those who are overweight or have a history of lower limb joint injuries. By adjusting the incline of the elliptical trainer's pedal path, users can simulate different exercise scenarios such as climbing, walking on flat ground, or going downhill, increasing the diversity and enjoyment of training. Adjusting the incline allows users to achieve a comprehensive workout for the lower limbs and core muscles, avoiding uneven muscle development caused by a single training mode. However, currently available elliptical trainers require an external power source to adjust the incline. Plug-in elliptical trainers need to be located near a power outlet, limiting installation space, and the power cord may affect the layout, restricting their use in environments without power. In cases of unstable power or power outages, the equipment may not function properly, impacting the user experience.

[0003] Self-generated electricity is already common in fitness equipment. Since the average person using an elliptical trainer outputs about 60W of electrical energy, this output is relatively small and can only be used for small screen displays or transmitting operation signals. Currently, there is no technology to use self-generated electricity to directly change the incline of the pedals during elliptical trainer use. Utility Model Content

[0004] To address the shortcomings of existing technologies, a pedal trajectory adjustment mechanism for an elliptical machine is provided that enables efficient energy conversion and dynamic distribution under self-generated power conditions, thereby supporting slope adjustment.

[0005] This utility model is achieved using the following technical solution: a pedal trajectory adjustment mechanism for a self-generating elliptical machine, comprising:

[0006] The mechanical transmission module includes a transmission system and a resistance system that are linked to the pedal. The resistance system is mechanically connected to the generator. The transmission system transmits the mechanical energy generated by the pedal during movement to the resistance system, which in turn drives the generator to generate electricity.

[0007] An energy conversion module includes an energy management device for regulating the distribution of electrical energy from a generator output to a battery and a push rod motor. The generator's output is connected to the energy management device, the energy management device's input receives the generator's real-time power output, and its outputs are connected to the battery and the push rod motor. The battery and energy management device are connected via a bidirectional charge-discharge link, which adapts to the difference between the battery's charge-discharge power and the generator's output power.

[0008] The human-computer interaction module includes a human-computer interaction input unit and a control system. The human-computer interaction input unit sends a slope adjustment command to the control system. The control system dynamically adjusts the power supply ratio of the energy management device to the push rod motor and changes the working state of the resistance system and the push rod motor according to the command.

[0009] The resistance system controls the resistance experienced by the user when pressing the pedal, and can be any existing magnetic damper. For example, it includes a permanent magnet array and an adjustable excitation coil. By changing the coil current, the magnetic field strength is adjusted, thereby controlling the user's pedal resistance and synchronously adjusting the generator load.

[0010] Among them, the energy management device is used to dynamically allocate electrical energy to the battery and push rod motor according to the real-time power generation and load demand. Its implementation methods include, but are not limited to, shunt regulators, power dividers or smart power routing chips.

[0011] This solution uses a transmission system and generator linked to the pedals to allow the user to drive the generator to generate electricity while exercising. The generator's electrical energy flows into the battery and push rod motor through an energy management device. Since the pedal trajectory slope adjustment is not used continuously, the generator generates electricity continuously. When no slope adjustment is made, the battery can store electrical energy.

[0012] The control system in this scheme dynamically adjusts the power supply ratio of the energy management device to the push rod motor according to instructions. When the push rod motor needs to work, since the energy management device and the battery have a bidirectional charging and discharging link, the energy management device can supply electrical energy from the battery and generator to the push rod motor, thereby ensuring the normal operation of the push rod motor. This achieves efficient energy conversion and dynamic distribution under self-generated power conditions, thus supporting the slope adjustment of the elliptical machine.

[0013] Preferably, the speed ratio between the transmission system and the generator is 20:1 to 30:1, and the generator continuously outputs fluctuating power of 5W-30W when the pedal is in motion.

[0014] The speed ratio between the transmission system and the generator is 20:1 to 30:1. A larger speed ratio can increase the power of the generator and generate more electrical energy.

[0015] Preferably, the energy management device includes a boost circuit based on a boost topology to boost the voltage to the voltage required by the push rod motor and control the push rod motor to operate.

[0016] Preferably, the bidirectional charge-discharge link is a bidirectional DC-DC converter based on Buck-Boost topology.

[0017] A bidirectional DC-DC converter based on Buck-Boost topology can achieve voltage boost and control of battery charging and discharging states.

[0018] Preferably, the energy management device controls the charging and discharging state of the battery through a bidirectional DC-DC converter based on the difference between the real-time output power of the generator and the total power consumption of the system.

[0019] When the generator's output power exceeds the system's real-time power consumption, the excess energy is transferred to the battery for storage; when the generator's output power is less than the system's real-time power consumption, energy is drawn from the battery to make up the power shortfall and maintain the operation of the entire system. The total system power consumption difference includes the combined power consumption of the resistance system, control system, pushrod motor, and other power-consuming components.

[0020] Preferably, the push rod motor is equipped with a reduction gear set, and the reduction ratio of the reduction gear set is >3:1.

[0021] Setting the reduction ratio in the push rod motor to >3:1 makes the reduction ratio between the motor and the push rod large, which can reduce the push rod's working speed while maintaining the same thrust. Therefore, a small-power motor can be used, thereby reducing the rated current.

[0022] Preferably, a biofeedback module is also included, which is equipped with a sensor. The control system is equipped with a display screen, and the sensor transmits signals to the control system. The control system is configured to display the user motion parameters collected by the sensor on the display screen in real time.

[0023] The sensor is any sensor used in existing elliptical trainers, such as a heart rate sensor or cadence sensor, which detects the user's exercise data in real time.

[0024] Preferably, it also includes a support rail, a ground rail, and a foot pedal tube. The pedal is connected to the foot pedal tube and fixed on the support rail. The ground rail is placed flat on the ground. The support rail is hinged to the ground rail. The output end of the push rod motor acts on the support rail to change the angle between the support rail and the ground rail, thereby changing the angle between the foot pedal tube and the ground.

[0025] The angle between the support rail and the ground rail is adjusted by extending and retracting the output end of the push rod motor.

[0026] Preferably, one end of the support rail is hinged to the ground rail, and the other end of the support rail is hinged to the output end of the push rod motor.

[0027] By placing the hinge connection and the output end of the push rod motor at the two ends of the support rail, the lever arm is maximized, reducing the load on the push rod motor.

[0028] Compared with existing technologies, the beneficial effects of this utility model are: 1. By having a larger speed ratio between the transmission system and the generator, the power of the generator is increased, thereby generating more electrical energy. 2. The electrical energy of the generator flows into the battery and the push rod motor through the energy management device. Since the pedal trajectory slope adjustment is not continuously used, the generator continuously generates electricity. When no slope adjustment is made, the battery can store electrical energy. 3. The energy management device, in conjunction with the generator and battery, achieves dynamic voltage boost through the built-in voltage compensation circuit of the energy management device, thereby reaching the rated power of the push rod motor. 4. The reduction ratio in the push rod motor is set to >3:1, which makes the reduction ratio between the motor and the push rod large. This allows the push rod's working speed to be reduced while maintaining the same thrust, thus allowing the use of a smaller power motor and reducing the rated current. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the utility model;

[0030] Figure 2 This is the system schematic diagram.

[0031] Reference numerals: 1. Ground rail; 2. Support rail; 3. Push rod motor; 4. Battery; 5. Pedal; 51. Foot pedal tube; 6. Transmission system; 7. Resistance system; 8. Generator; 9. Energy management device; 10. Control system; 11. Heart rate sensor; 12. Shuttle and buttons. Detailed Implementation

[0032] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 and Figure 2As shown, this embodiment discloses a pedal trajectory adjustment mechanism for a self-generating elliptical machine, including a ground rail 1 placed flat on the ground, a support rail 2 and a push rod motor 3 on the ground rail 1, the push rod motor having a thrust of 8200N. One end of the support rail 2 is hinged to the ground rail 1, and the other end of the support rail 2 is hinged to the output end of the push rod motor 3. The output end of the push rod motor 3 is a push rod, which pushes the support rail 2 to change the angle between the support rail 2 and the ground rail 1. The support rail 2 is provided with a foot pedal tube 51 and a pedal 5 for the user to step on, the pedal 5 being located at the end of the foot pedal tube 51. The push rod motor 3 is provided with a reduction gear set (not shown in the figure), the reduction gear set including a small gear connected to the rotor shaft of the motor and a large gear meshing with the small gear, the small gear having 11 teeth and the large gear having 44 teeth, making the reduction ratio of the reduction gear set 4:1. The elliptical trainer includes a mechanical transmission module, an energy conversion module, a human-computer interaction module, and a biofeedback module. The mechanical transmission module consists of a transmission system 6 and a resistance system 7 mounted on the ground track 1. The transmission system 6 includes a flywheel, and the other end of the foot pedal tube 51 is connected to the flywheel and can drive the flywheel to rotate. The flywheel is connected to the resistance system 7, and the connection can be made by means of gears, chains, belts, etc.

[0034] The resistance system 7 is a magnetic damping system, and it is mechanically connected to the generator 8. This mechanical connection can be a coaxial direct drive. When the user presses the pedal 5, the flywheel of the transmission system 6 rotates, ultimately driving the generator 8 to generate electricity. In this embodiment, the flywheel and the resistance system are connected by a synchronous belt, and the speed ratio between the transmission system 6 and the generator 8 is 26:1. The generator 8 continuously outputs fluctuating power of 5W-30W during pedal movement.

[0035] The energy conversion module includes an energy management device 9 for regulating the distribution of electrical energy from the generator 8 to the battery 4 and the push rod motor 3. The battery has a capacity of 6000-10000mA. The output of the generator 8 is connected to the energy management device 9, the input of the energy management device 9 receives the real-time power output of the generator 8, and the outputs are connected to the battery 4 and the push rod motor 3, respectively. The battery 4 and the energy management device 9 are connected via a bidirectional DC-DC converter (not shown in the figure) based on a Buck-Boost topology. The bidirectional DC-DC converter based on the Buck-Boost topology is used to adapt to the difference between the charging and discharging power of the battery 4 and the output power of the generator 8. When the push rod motor 3 needs to work, the energy management device 9 boosts the voltage to the voltage required by the push rod motor 3 through the boost circuit of the Boost topology, and controls the push rod motor 3 to work by outputting a PWM signal through the MCU.

[0036] The energy management device 9 may include a power divider and a boost circuit. The power divider is used to dynamically distribute the electrical energy output by the generator, and the boost circuit boosts the voltage to the operating voltage required by the push rod motor.

[0037] The energy management device 9 may include a boost circuit based on Boost topology and a shunt regulator to respectively boost the generator output voltage to the push rod motor operating voltage and achieve precise voltage control.

[0038] Among them, the energy management device 9 can also use the TI BQ25703A chip, which integrates the MPPT (maximum power point tracking) algorithm to optimize the generator output power in real time and through I 2 The C interface communicates with the control system to achieve dynamic allocation of the power supply ratio of the push rod motor.

[0039] The human-machine interface module includes a human-machine interface input unit and a control system 10. The human-machine interface input unit consists of a shuttle and buttons 12. The shuttle and buttons 12 allow the user to input commands to the control system 10, sending slope adjustment commands to activate the push rod motor 3, or sending resistance adjustment commands to change the resistance of the resistance system 7. The control system 10 dynamically adjusts the power supply ratio of the energy management device 9 to the push rod motor 3 according to the commands. When the push rod motor 3 needs to operate, it can instantly receive more electrical energy to meet its instantaneous power requirements.

[0040] The biofeedback module is equipped with a heart rate sensor 11 and a cadence sensor (not shown in the figure). The control system 10 is equipped with a display screen. The heart rate sensor 11 and the cadence sensor transmit signals to the control system 10. The control system 10 is configured to display the user's motion parameters collected by the sensors on the display screen in real time.

[0041] The energy management device 9 controls the charging and discharging state of the battery through a bidirectional DC-DC converter based on the difference between the real-time output power of the generator 8 and the total power consumption of the system. The total power consumption of the system includes the combined power consumption of the resistance system 7, heart rate sensor 11, cadence sensor, control system 10, push rod motor 3, and display screen.

Claims

1. A pedal trajectory adjustment mechanism for a self-generating elliptical trainer, characterized in that, include: The mechanical transmission module includes a transmission system and a resistance system that are linked to the pedal. The resistance system is mechanically connected to the generator. The transmission system transmits the mechanical energy generated by the pedal during movement to the resistance system, which in turn drives the generator to generate electricity. An energy conversion module includes an energy management device for regulating the distribution of electrical energy from a generator output to a battery and a push rod motor. The generator's output is connected to the energy management device, the energy management device's input receives the generator's real-time power output, and its outputs are connected to the battery and the push rod motor. The battery and energy management device are connected via a bidirectional charge-discharge link, which adapts to the difference between the battery's charge-discharge power and the generator's output power. The human-computer interaction module includes a human-computer interaction input unit and a control system. The human-computer interaction input unit sends a slope adjustment command to the control system. The control system dynamically adjusts the power supply ratio of the energy management device to the push rod motor according to the command, and changes the working state of the resistance system and the push rod motor. The energy management device includes a boost circuit based on a boost topology to boost the voltage to the voltage required by the push rod motor and control the push rod motor to work. The bidirectional charge-discharge link is a bidirectional DC-DC converter based on Buck-Boost topology.

2. The pedal trajectory adjustment mechanism of the self-generating elliptical machine according to claim 1, characterized in that: The speed ratio between the transmission system and the generator is 20:1 to 30:1, and the generator continuously outputs fluctuating power of 5W-30W when the pedal is in motion.

3. The pedal trajectory adjustment mechanism of the self-generating elliptical machine according to claim 1, characterized in that: The energy management device controls the charging and discharging state of the battery through a bidirectional DC-DC converter based on the difference between the real-time output power of the generator and the total power consumption of the system.

4. The pedal trajectory adjustment mechanism of the self-generating elliptical machine according to claim 1, characterized in that: The push rod motor is equipped with a reduction gear set, and the reduction ratio of the reduction gear set is >3:

1.

5. The pedal trajectory adjustment mechanism of the self-generating elliptical machine according to claim 1, characterized in that: It also includes a biofeedback module, which is equipped with a sensor. The control system is equipped with a display screen. The sensor transmits signals to the control system, and the control system is configured to display the user's motion parameters collected by the sensor on the display screen in real time.

6. The pedal trajectory adjustment mechanism of the self-generating elliptical machine according to claim 1, characterized in that: It also includes a support rail, a ground rail, and a foot pedal tube. The pedal is connected to the foot pedal tube and fixed on the support rail. The ground rail is placed flat on the ground. The support rail is hinged to the ground rail. The output end of the push rod motor acts on the support rail to change the angle between the support rail and the ground rail, thereby changing the angle between the foot pedal tube and the ground.

7. The pedal trajectory adjustment mechanism of the self-generating elliptical machine according to claim 6, characterized in that: One end of the support rail is hinged to the ground rail, and the other end of the support rail is hinged to the output end of the push rod motor.

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