CN220616078U - Large-torque electric power assisting mechanism - Google Patents

Abstract

The utility model discloses a high-torque electric power assisting mechanism which comprises a shell, a shell cover, a motor assembly, a main shaft assembly, a first shaft assembly, a second shaft assembly, a moment sensor assembly and a circuit board assembly, wherein the first shaft assembly is connected with the motor assembly; the main shaft assembly, the first shaft assembly and the second shaft assembly are meshed with each other through three gear assemblies to form three-shaft linkage; the motor component provides power, the torque sensor component receives a torque signal, the circuit board component receives the signal to drive the motor component to rotate, and the three assemblies are sequentially driven to rotate through gear engagement. The high-rotation-speed low-torque power generated by the motor shaft during the operation of the mechanism is transmitted to the main shaft through primary speed reduction, secondary speed reduction and tertiary speed reduction, so that the speed reduction effect is achieved, and meanwhile, the high-torque power is output through the main shaft. And the gears are designed with small modulus and multiple teeth, and the gear precision grade is high, so that the running stability of the gears is ensured, the noise is low, the loss of energy consumption is reduced, the efficiency is improved, the riding feeling is enhanced, and the riding experience is better.

Description

A high-torque electric power-assist mechanism

Technical field

The utility model relates to the field of electric power assist mechanisms, in particular to a large torque electric power assist mechanism.

Background technique

In the functional module of an electric-assist bicycle, the drive unit refers to the power provided by the battery that drives the motor to rotate, thereby driving the bicycle; as the brain and actuator of the electric-assist bicycle, the power and smoothness of its operation will directly affect the performance of the electric-assist bicycle. Cycling experience.

Among the existing products, most of them are two-axis linkage. The speed ratio of the two-axis linkage products is small, the final output torque is small, and the power is insufficient. Moreover, when designing gear sets for two-axis linkage products, the gear module is often large and the number of teeth is small, which can lead to unstable transmission and high noise, which ultimately leads to high energy loss, reduced motor efficiency, greatly reduced output torque, and affects the riding experience. feel. Therefore, the electric power-assisted drive unit has the disadvantages of small torque and small power, which cannot meet the power needs of cyclists, which will affect the riding experience to a certain extent and lose the fun of riding.

Utility model content

Purpose of the utility model: In order to solve the problems existing in the existing technology, the utility model provides a high-torque electric power-assist mechanism, which adopts multi-axis linkage and effectively solves the problem of low torque and insufficient power of the existing drive unit.

Technical solution: In order to achieve the above purpose, the utility model can adopt the following technical solution: a high-torque electric power-assist mechanism, including a housing, a housing cover, a motor assembly, a main shaft assembly, a first shaft assembly, a second shaft assembly, The torque sensor assembly and the circuit board assembly; the housing and the housing cover cooperate to form a cavity, and the main shaft assembly, the first shaft assembly, and the second shaft assembly are integrated on the circuit board assembly in the middle of the cavity; The motor assembly is assembled on one side of the cavity, and the end close to the housing cover is provided with a magnetic braid, and the other end penetrates the housing and is assembled in the cavity through the motor cover; the main shaft assembly, shaft one assembly, and shaft two The assembly forms three-axis linkage through three gear assemblies meshing with each other; the motor assembly provides power; the torque sensor assembly receives the torque signal, and the circuit board assembly receives the signal to drive the motor assembly to rotate, and drives the shaft one in turn through the gear meshing assembly, shaft two assembly and spindle rotation.

Furthermore, the housing cover and the housing are assembled through a middle housing connection portion and a plurality of screws arranged around the periphery.

Furthermore, the motor assembly extends from the direction of the housing cover to the housing direction and includes a magnetic braid, a motor shaft assembly, a retaining ring, a deep groove ball bearing, a rotor assembly, a stator, a motor tolerance ring and a motor cover; The motor assembly is assembled through the housing and assembled in the cavity through the motor cover.

Furthermore, the first shaft assembly, the second shaft assembly and the main shaft assembly respectively include the first shaft gear assembly, the second shaft gear assembly and the main shaft gear assembly. The three gear assemblies are all double gears with one large and one small. .

Furthermore, the large gear of the shaft-one gear assembly meshes with the gear on the motor assembly, the pinion gear meshes with the large gear of the shaft-two gear assembly, and the pinion gear of the shaft-two gear assembly meshes with the large gear of the main shaft gear assembly. , the pinion of the main shaft gear assembly is connected to an externally applied electric power-assisted bicycle, and the three gear assemblies form a three-level linkage in turn.

Furthermore, the housing cover is provided with a through hole, and the pinion of the main shaft gear assembly of the main shaft assembly passes through the through hole to connect to the electric power-assisted bicycle to which it is applied.

Furthermore, all gears of the three gear assemblies are designed with small modules, multiple gears, and high precision levels.

Furthermore, the torque sensor assembly includes a torque sensor assembly connected below the main shaft assembly.

Furthermore, when riding, the torque sensor component receives the torque signal, the circuit board component senses the signal, and transmits it to the magnetic encoder through the encoder sensing signal, which ultimately drives the motor component to rotate.

Beneficial effects: Compared with the existing technology, the utility model has the following significant advantages: (1) The utility model adopts multi-axis linkage, and the design takes into account both the smoothness of gear meshing and the improvement of the speed ratio, thereby reducing the It reduces energy loss and increases the output torque by nearly 1/3. (2) When the mechanism of this utility model is running, the high-speed and low-torque power from the motor shaft is transmitted to the main shaft through one-stage deceleration, two-stage deceleration, and three-stage deceleration to achieve a deceleration effect. At the same time, high-torque power is output through the main shaft. The gears are all designed with small module and multiple teeth, and the gear accuracy level is high, which ensures the smooth operation of the gear and low noise, thus reducing the loss of energy consumption, improving efficiency, enhancing the riding feeling and riding comfort. The experience is better. (3) Through the reasonable layout of the internal cavity structure, the casing is small in size and is smaller and more delicate than the two-axis linkage product casings on the market, which facilitates the design and layout of the hanger and vehicle frame.

Description of the drawings

Figure 1 is a schematic diagram of the exploded structure of the high-torque electric power assist mechanism in Embodiment 1 of the present utility model;

Figure 2 is a schematic structural diagram of the direction view of the housing of the high-torque electric power-assist mechanism in Embodiment 1 of the present utility model;

Figure 3 is a schematic cross-sectional structural diagram along the G-G direction in Figure 2;

Figure 4 is a schematic structural diagram of the direction view of the housing cover of the high-torque electric power-assist mechanism in Embodiment 1 of the present utility model;

Figure 5 is a schematic cross-sectional structural diagram along the H-H direction in Figure 4;

Figure 6 is a schematic three-dimensional structural diagram of Embodiment 1 of the present utility model;

Figure 7 is a schematic diagram of the three-stage gear linkage meshing structure in Embodiment 1 of the present utility model;

Figure 8 is a schematic diagram of the exploded structure of the motor assembly in Embodiment 1 of the present invention.

Detailed ways

Example 1:

Please refer to Figures 1-6. The utility model discloses a high-torque electric power assist mechanism, which includes a housing cover 1, a housing 2, a motor assembly 3, a main shaft assembly 7, a first shaft assembly 4, and a second shaft assembly. 6. Torque sensor assembly 9 and circuit board assembly 8; the housing 2 and the housing cover 1 cooperate to form a cavity, and the main shaft assembly 7, the first shaft assembly 4, and the second shaft assembly 6 are integrated in On the circuit board assembly 8 in the middle of the cavity, the housing cover 1 and the housing 2 are assembled through the middle housing connection part 12 and a plurality of screws arranged around it.

Please refer to Figures 1 and 8. The motor assembly 3 is assembled on one side of the cavity, extending from the direction of the housing cover 2 to the direction of the housing 1, including the magnetic braid 31, the motor shaft assembly 32, the retaining ring 33, the deep Groove ball bearing 34, rotor assembly 35, stator 36, motor tolerance ring 37 and motor cover 38; the motor assembly 3 is assembled through the housing 1 and assembled in the cavity through the motor cover 38.

The first shaft assembly 4, the second shaft assembly 6 and the main shaft assembly 7 respectively include a first shaft gear assembly, a second shaft gear assembly and a main shaft gear assembly 71. The three gear assemblies are double gears with one large and one small. . The three assemblies mesh with each other through three gear assemblies to form a three-axis linkage; please refer to Figure 7 for details. The large gear 412 of the shaft-gear assembly meshes with the gear 321 on the motor shaft assembly 32, and the small gear 44 meshes with the gear 321 of the motor shaft assembly 32. The large gear 612 of the second shaft gear assembly meshes with the small gear 64 of the second shaft gear assembly and the large gear 712 of the main shaft gear assembly 71. The small gear 74 of the main shaft gear assembly 71 is connected to an externally applied electric power-assisted bicycle, The three gear assemblies form a three-level linkage in turn. The housing cover 1 is provided with a through hole 5, and the pinion 74 of the main shaft gear assembly 71 of the main shaft assembly 7 passes through the through hole 5 to connect with the electric power-assisted bicycle to which it is applied. The optimal transmission ratio of the third-stage gear is 38.645. All gears of the three gear assemblies are designed with small modules, multiple gears, and high precision levels, as follows:

Gear set 1mn=1.3mt=1.465α=26°

Gear set 2mn=0.584mt=0.633α=18.5°

Gear set 3mn=0.863mt=0.878α=20.5°.

Where mn is the normal module, mt is the end module, and α is the gear pressure angle.

The torque sensor assembly 9 includes a torque sensor assembly, which is connected below the main shaft assembly 7 . The motor component 3 provides power; when riding, the torque sensor component 9 receives a torque signal, the circuit board component 8 receives the signal, and transmits the signal to the magnetic encoder 31 through the encoder induction signal, which ultimately drives the motor component 3 to rotate, and the motor shaft The assembly 32 drives the first shaft assembly 4, the second shaft assembly 6 and the main shaft assembly 7 to rotate through the meshing of the gear 321 and the above-mentioned three-stage gear linkage structure to drive the electric bicycle riding work to which it is applied. When the mechanism is running, the high-speed and low-torque power from the motor shaft is transmitted to the main shaft through one-stage deceleration, two-stage deceleration, and three-stage deceleration to achieve the deceleration effect. At the same time, high-torque power is output through the main shaft. Compared with the traditional two-axis linkage The mechanism torque increases by nearly 1/3. Moreover, the gears used in this utility model are all designed with small module and multiple teeth, and the gear precision level is high, ensuring the smooth operation of the gear and low noise, thereby reducing the loss of energy consumption, improving efficiency, and enhancing The riding feel and riding experience are better.

Claims (9)

1. A high-torque electric power-assist mechanism, characterized by comprising a housing, a housing cover, a motor assembly, a main shaft assembly, a first shaft assembly, a second shaft assembly, a torque sensor assembly and a circuit board assembly; the housing It cooperates with the housing cover to form a cavity, and the main shaft assembly, shaft one assembly, and shaft two assembly are integrated on the circuit board assembly in the middle of the cavity; the motor assembly is assembled on one side of the cavity, close to the housing One end of the body cover is provided with a magnetic braid, and the other end penetrates the housing and is assembled in the cavity through the motor cover; the main shaft assembly, the first shaft assembly, and the second shaft assembly are meshed with each other through three gear assemblies to form three Shaft linkage; the motor component provides power; the torque sensor component receives a torque signal, and the circuit board component receives the signal to drive the motor component to rotate, which sequentially drives the first shaft assembly, the second shaft assembly and the main shaft to rotate through gear meshing. 2. The high-torque electric power assist mechanism according to claim 1, characterized in that the housing cover and the housing are assembled through a middle housing connection portion and a plurality of screws provided around the periphery. 3. The high-torque electric power-assist mechanism according to claim 1, characterized in that: the motor assembly extends from the direction of the housing cover to the direction of the housing and sequentially includes a magnetic braid, a motor shaft assembly, a retaining ring, and a deep groove ball bearing. The rotor assembly, the stator, the motor tolerance ring and the motor cover; the motor assembly is assembled through the housing and assembled in the cavity through the motor cover. 4. The high-torque electric power-assist mechanism according to claim 1, characterized in that: the first shaft assembly, the second shaft assembly and the main shaft assembly respectively include a first shaft gear assembly, a second shaft gear assembly and a main shaft gear assembly. , the three gear assemblies are double gears with one large and one small. 5. The high-torque electric power assist mechanism according to claim 4, characterized in that: the large gear of the shaft-one gear assembly meshes with the gear on the motor assembly, and the small gear meshes with the large gear of the shaft-two gear assembly. The pinion of the second axis gear assembly meshes with the large gear of the main shaft gear assembly. The pinion of the main shaft gear assembly is connected to an externally applied electric power-assisted bicycle. The three gear assemblies form a three-level linkage in turn. 6. The high-torque electric power assist mechanism according to claim 4, characterized in that: the housing cover is provided with a through hole, and the pinion of the main shaft gear assembly of the main shaft assembly passes through the through hole and is used with the main shaft gear assembly. Electric assist bicycle connection. 7. The high-torque electric power-assist mechanism according to claim 4, characterized in that: all gears of the three gear assemblies are designed with small module, multiple gears, and high precision level. 8. The high-torque electric power assist mechanism according to claim 1, characterized in that: the torque sensor assembly includes a torque sensor assembly connected below the main shaft assembly. 9. The high-torque electric power-assist mechanism according to claim 1, characterized in that: when riding, the torque sensor component receives the torque signal, the circuit board component senses the signal, and transmits it to the magnetic encoder through the encoder sensing signal, and finally drives the motor. The motor assembly rotates.