Two-axis speed-regulating mid-mounted motor

Abstract

The present invention discloses a two-axis speed-adjustable mid-mounted motor, including a housing. A pedal shaft is rotatably connected to the left side inside the housing. One end of the pedal shaft is fixed with a manual driving wheel. A transmission input end is rotatably connected to the right side inside the housing. One end of the transmission input end is fixed with a speed-adjusting rod, and the speed-adjusting rod extends to the outside of the housing. For this two-axis speed-adjustable mid-mounted motor, in the transmission principle of a pedal-assisted electric bicycle equipped with a mid-mounted motor, by integrating the speed-changing function into the mid-mounted motor itself, different speed-changing gears can be available when the mid-mounted motor outputs, meeting the needs of riders and giving riders more choices. During the design process, the transmission is not simply installed in the mid-mounted motor housing. At the same time, the two-way clutch function of the mid-mounted motor to ensure that the motor and the manual part do not interfere with each other is rearranged, making the overall structure more reasonable and the space more compact.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and particularly relates to a two-axis speed-regulating mid-mounted motor. Background Art

[0002] As a green means of transportation, assisted electric bicycles have been vigorously developed internationally in the past decade and have formed a huge industry. The motors of assisted electric bicycles are generally divided into front hub motors, rear hub motors and mid-mounted motors according to their installation positions. Due to its beautiful structure and relatively small impact on the center of gravity of the whole vehicle, the mid-mounted motor has achieved quite great success in the assisted electric bicycle industry compared with the front and rear hub motors.

[0003] In order to meet the needs of different road conditions, assisted electric bicycles have different gears, which are mainly reflected in that at the same pedal speed, the assisted electric bicycle can travel at high speed and low speed. Traveling at low speed is more labor-saving than at high speed. For example, when climbing a slope or starting, the low-speed gear is mainly used, which is more labor-saving; on flat roads, the high-speed gear is used.

[0004] An ordinary bicycle adjusts the speed by running the chain on chainrings with different numbers of teeth in the bottom bracket chainring set and the rear wheel chainring set. Usually, 3 chainrings are selected for the bottom bracket chainring set and 7 chainrings for the rear wheel chainring set, with a total of 21-speed variable speed. The speed change range is from the largest number of teeth of the bottom bracket chainring divided by the smallest number of teeth of the rear wheel chainring to the smallest number of teeth of the bottom bracket chainring divided by the largest number of teeth of the rear wheel chainring. However, such a speed regulation method has the risk of chain dropping. For higher-end bicycles, an expensive internal transmission is selected for the rear wheel. The mainstream ones have 5-speed variable speed, 7-speed variable speed, and 8-speed variable speed. In this way, the chain only uses one chainring at the rear wheel, reducing the risk of chain dropping at the rear wheel. However, the common method for the bottom bracket is still to use a chainring set to complete the speed change. The total number of gears is the number of chainrings in the bottom bracket chainring set multiplied by the number of speed change gears at the rear wheel. The speed change range is from the largest number of teeth of the bottom bracket chainring divided by the number of teeth of the rear wheel chainring multiplied by the fastest reduction ratio of the internal transmission to the smallest number of teeth of the bottom bracket chainring divided by the number of teeth of the rear wheel chainring multiplied by the slowest reduction ratio of the internal transmission. Summary of the Invention

[0005] The purpose of the present invention is to provide a two-axis speed-regulating mid-mounted motor to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: a two-axis speed-regulating mid-mounted motor, including a housing. A pedal shaft is rotatably connected to the left side inside the housing. One end of the pedal shaft is fixed with a manual driving wheel. A transmission input end is rotatably connected to the right side inside the housing. One end of the transmission input end is fixed with a speed-regulating rod, and the speed-regulating rod extends outside the housing. A one-way clutch is arranged on the outer side wall of the transmission input end, and a manual driven wheel and an electric driven wheel are respectively fixed on the one-way clutch. The other end of the transmission input end is connected to a transmission. The output end of the transmission is fixed with a speed-changing output wheel. One end of the transmission is provided with a speed-changing output end, and the speed-changing output end extends outside the housing. The other end of the pedal shaft is fixed with an output wheel. The middle of the pedal shaft is fixed with a motor rotor. A motor stator is rotatably connected to the outside of the motor rotor. A reduction system output wheel is also fixed on the pedal shaft.

[0007] Preferably, the manual driving wheel and the manual driven wheel are in meshing transmission connection with each other.

[0008] Preferably, the electric driven wheel and the reduction system output wheel are in meshing transmission connection with each other.

[0009] Preferably, the speed-changing output wheel and the output wheel are in meshing transmission connection with each other.

[0010] Preferably, the motor stator is fixedly connected to the inner side wall of the housing, and the reduction system output wheel is located between the manual driving wheel and the motor stator.

[0011] The technical effects and advantages of the present invention: For this two-axis speed-regulating mid-mounted motor, which configures the transmission principle of a pedal-assisted electric bicycle with a mid-mounted motor. By integrating the speed-changing function into the mid-mounted motor itself, different speed-changing gears can be available when the mid-mounted motor outputs, meeting the needs of riders and giving riders more choices. During the design process, it is not simply installing a transmission into the mid-mounted motor housing. At the same time, the two-way clutch function of the mid-mounted motor to ensure that the motor and the manual part do not interfere with each other is rearranged, making the overall structure more reasonable and the space more compact. Description of the Drawings

[0012] Figure 1 It is a structural sectional view of the present invention.

[0013] In the figure: 1, housing; 2, pedal shaft; 3, manual driving wheel; 4, manual driven wheel; 5, one-way clutch; 6, speed-regulating rod; 7, transmission input end; 8, electric driven wheel; 9, speed-changing output wheel; 10, transmission; 11, speed-changing output end; 12, output wheel; 13, motor rotor; 14, motor stator; 15, reduction system output wheel. Detailed Embodiments

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] The present invention provides Figure 1 The two-shaft speed-regulating mid-mounted motor shown comprises a housing 1, wherein the left side of the housing 1 is rotatably connected with a pedal shaft 2, one end of the pedal shaft 2 is fixed with a human-powered driving wheel 3, specifically, the human-powered driving wheel 3 and the human-powered driven wheel 4 are in meshing transmission connection with each other, the right side of the housing 1 is rotatably connected with a gearbox input end 7, one end of the gearbox input end 7 is fixed with a speed regulating rod 6, and the speed regulating rod 6 extends to the outside of the housing 1, a one-way clutch 5 is arranged on the outer side wall of the gearbox input end 7, and a human-powered driven wheel 4 and an electric driven wheel 8 are respectively fixed on the one-way clutch 5, and manpower is input from the pedal shaft 2, and is transmitted to the gearbox 10 through the meshing transmission of the human-powered driving wheel 3 and the human-powered driven wheel 4 through the one-way clutch 5;

[0016] The other end of the gearbox input end 7 is connected to a gearbox 10, and a speed-changing output wheel 9 is fixed to the output end of the gearbox 10. A speed-changing output end 11 is provided at one end of the gearbox 10, and the speed-changing output end 11 extends to the outside of the housing 1. An output wheel 12 is fixed to the other end of the pedal shaft 2. Specifically, the speed-changing output wheel 9 and the output wheel 12 are in mutual meshing transmission connection. A motor rotor 13 is fixed to the middle part of the pedal shaft 2, and a motor stator 14 is rotatably connected to the outer side of the motor rotor 13. Specifically, the motor stator 14 is fixedly connected to the inner side wall of the housing 1. The reduction system output wheel 15 is located between the human driving wheel 3 and the motor stator 14. A reduction system is also fixed on the pedal shaft 2. System output wheel 15, specifically, the electric driven wheel 8 and the reduction system output wheel 15 are in mutual meshing transmission connection, the motor power is transmitted from the rotor to the reduction system, and is output from the speed change output wheel 9 after deceleration, meshing with the electric driven wheel for transmission, and transmitted to the gearbox 10 through the one-way clutch 5. The working directions of the human driven wheel 4 and the electric driven wheel 8 are consistent. In the working direction, the human driven wheel 4 can drive the gearbox input end 7 to rotate, and the electric driven wheel 8 can drive the gearbox input end 7 to rotate. Because there is a one-way clutch 5, the gearbox input end 7 will not drive the human driven wheel 4 and the electric driven wheel 8, so that both human power and motor power can be transmitted to the gearbox 10 for speed change, and the human power and motor power can form a combined force without hindering each other.

[0017] When the two-axis speed-regulating mid-mounted motor works, human power is input from the pedal shaft 2. Through the meshing transmission of the human power driving wheel 3 and the human power driven wheel 4, it is transmitted into the gearbox 10 through the one-way clutch 5;

[0018] The power of the motor is transmitted from the rotor to the deceleration system. After deceleration, it is output from the variable-speed output wheel 9, meshes with the electric driven wheel for transmission, and is transmitted into the gearbox 10 through the one-way clutch 5;

[0019] The working directions of the human power driven wheel 4 and the electric driven wheel 8 are the same. When working, the human power driven wheel 4 can drive the input end 7 of the gearbox to rotate, and the electric driven wheel 8 can drive the input end 7 of the gearbox to rotate. Because of the one-way clutch 5, the input end 7 of the gearbox will not drive the human power driven wheel 4 and the electric driven wheel 8. In this way, both human power and motor power can be transmitted into the gearbox 10 for speed change, and human power and motor power can form a resultant force without hindering each other;

[0020] Controlling the speed-regulating lever can adjust the gearbox 10 to have different speed ratios. The power after being speed-changed by the gearbox 10 is output from the variable-speed output wheel 9, and is output to the outside of the housing by the output gear after meshing transmission;

[0021] The output direction of the output gear is the same as that of the pedal shaft 2;

[0022] Considering structural compactness and industry habits, for example, the volume of a high-speed motor with a deceleration system is smaller than that of directly designing a low-speed motor. For example, usually the pedal shaft 2 and the output of the middle shaft of an assisted electric bicycle are coaxial. For example, the working direction of the pedal shaft 2 is the same as that of the output gear. If the above common situations are not considered during design, the following situations should also be protected;

[0023] The motor rotor 13 is directly transmitted to the electric driven wheel 8 without passing through the deceleration system;

[0024] The working directions of the human power driven wheel 4 and the electric driven wheel 8 are not the same, but after adding a commutation mechanism, the power directions finally become the same inside the gearbox 10;

[0025] The power is directly output from the output end of the gearbox 10;

[0026] The working direction of the power output is not the same as that of the pedal shaft 2;

[0027] The motor system composed of the motor stator 14 and the motor rotor 13 and the pedal shaft 2;

[0028] The motor rotor 13 is not installed on the shaft but on the housing;

[0029] The transmission method is not limited to gear transmission, and can also be chain transmission or friction wheel transmission, etc.

[0030] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Two-axis speed-regulating mid-mounted motor, including a housing (1), characterized in that: On the left side inside the housing (1), a foot pedal shaft (2) is rotatably connected. One end of the foot pedal shaft (2) is fixedly provided with a manual driving wheel (3). On the right side inside the housing (1), a transmission input end (7) is rotatably connected. One end of the transmission input end (7) is fixedly provided with a speed regulating rod (6), and the speed regulating rod (6) extends outside the housing (1). A one-way clutch (5) is arranged on the outer side wall of the transmission input end (7), and a manual driven wheel (4) and an electric driven wheel (8) are respectively fixedly arranged on the one-way clutch (5). The other end of the transmission input end (7) is connected to a transmission (10). The output end of the transmission (10) is fixedly provided with a variable-speed output wheel (9). One end of the transmission (10) is provided with a variable-speed output end (11), and the variable-speed output end (11) extends outside the housing (1). The other end of the foot pedal shaft (2) is fixedly provided with an output wheel (12). In the middle of the foot pedal shaft (2), a motor rotor (13) is fixedly arranged. The motor stator (14) is rotatably connected to the outside of the motor rotor (13). A reduction system output wheel (15) is also fixedly arranged on the foot pedal shaft (2). The manual driving wheel (3) and the manual driven wheel (4) are in meshing transmission connection with each other. The electric driven wheel (8) and the reduction system output wheel (15) are in meshing transmission connection with each other. The variable-speed output wheel (9) and the output wheel (12) are in meshing transmission connection with each other. The motor stator (14) is fixedly connected to the inner side wall of the housing (1). The reduction system output wheel (15) is located between the manual driving wheel (3) and the motor stator (14).

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