A large-ratio intermediate motor structure

Abstract

The utility model discloses a big speed ratio middle -position motor structure, including motor left cover, right cover, casing and be located in the stator of casing, rotor, rotor connection sun gear, casing connection fixed inner toothed ring. Planetary gear train subassembly contains double planetary gear and planet carrier, and double planetary gear is engaged with sun gear, fixed inner toothed ring, and its input end gear modulus is greater than the output end gear, realizes two -stage reduction. Output mechanism is by output inner toothed ring, output flange, clutch etc. constitute, and clutch is one -way overrunning clutch. In addition, also be equipped with the split crank shaft of spline section, dynamic torque sensor etc. form clutch mechanism. The controller is integrated in motor casing. The structure realizes big speed ratio transmission through optimization planetary transmission, compact layout, promotes transmission efficiency, and has flexible clutch control and torque monitoring feedback function.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, specifically to a high-speed-ratio mid-mounted motor structure. Background Technology

[0002] In existing technologies, common structures for achieving high speed ratio transmission, such as cycloidal pinwheels and harmonic drives, suffer from complex manufacturing processes, high costs, and low transmission efficiency, making it difficult to meet the lightweight and high-efficiency requirements of electric bicycles. Furthermore, NGW+NW planetary gear systems, similar to those used in patent CN202421567138, have limited speed ratio adjustment ranges, less compact overall structures, and a greater variety of parts, increasing assembly difficulty and weight.

[0003] Therefore, it is of great significance to provide a high-speed-ratio mid-drive motor structure to solve the problems existing in the current technology. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a high-speed-ratio mid-drive motor structure to solve the problem.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A high-speed-ratio mid-drive motor structure includes: The left cover of the motor, the right cover of the motor, and the motor housing connecting the two; The motor stator and motor rotor are housed within the motor housing; Sun gears that are interference-fitted to the motor rotor; A fixed internal gear ring that is interference-fitted to the motor housing; Planetary transmission assembly, comprising: A double planetary gear meshing with a sun gear and a fixed internal gear ring, the double planetary gear having an input end gear and an output end gear; A planet carrier supporting a double planetary gear, wherein the double planetary gear and the planet carrier are fitted with a pin with clearance; Output mechanism, including: The output internal gear ring meshes with the output end gear; The output flange is interference-fitted with the output internal gear ring; The output flange is supported on the motor housing by bearing two. A clutch press-fitted onto the output flange; The gear plate support that mates with the outer ring of the clutch; Preferred options also include: The centrally located motor has a separate crankshaft with a splined section; A dynamic torque sensor connected to a split crankshaft spline; A clutch support splinedly connected to a dynamic torque sensor, wherein the clutch support end is integrated with a pawl and spring plate structure; The ratchet, connected to the sprocket support by a thread, forms the clutch mechanism between the clutch support and the sprocket support.

[0006] Preferably, the planetary carrier and the output flange are supported by a bearing.

[0007] Preferably, the motor housing also includes a controller and a controller housing, and the controller is electrically connected to the motor stator.

[0008] Preferably, the input gear module of the double planetary gear is greater than the output gear module, forming a two-stage reduction.

[0009] Preferably, the clutch is a one-way overrunning clutch, which allows the crankshaft support to rotate freely relative to the output flange.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. High speed ratio and high efficiency: The 3K planetary mechanism is used for the first time in the field of EBIKE mid-drive motors, which can achieve a reduction ratio in the range of 30 to 200, with a theoretical forward transmission efficiency of 92% and a reverse transmission efficiency of 90%.

[0011] 2. Structural advantages: Compared with cycloidal pinwheel, harmonic and other structures, it is simple to manufacture and has high transmission efficiency; compared with NGW+NW planetary gear train, it has a wider speed ratio adjustment range, a more compact overall structure and fewer types of parts.

[0012] 3. Noise control: The double planetary gears are made of special PEEK injection molding material, and the noise of the whole machine is significantly lower than that of cycloidal pinwheels, harmonics and other structures.

[0013] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings.

[0014] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a structural diagram of the planetary carrier in this utility model.

[0017] In the diagram: 1. Left cover of the motor; 2. Motor stator; 3. Motor rotor; 4. Sun gear; 5. Split crankshaft of the central motor; 6. Dynamic torque sensor; 7. Controller; 8. Controller housing; 9. Clutch support; 10. Motor housing; 11. Fixed internal gear ring; 12. Double planetary gear; 13. Output internal gear ring; 14. Output flange; 15. Bearing 1; 16. Bearing 2; 17. Clutch; 18. Ratchet; 19. Crankset support; 20. Right cover of the motor; 21. Planetary carrier. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. In the following description, specific details such as specific configurations and components are provided merely to help fully understand the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted in the embodiments.

[0019] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0020] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0021] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0022] Please see Figure 1-3 This utility model provides a technical solution for a high-speed-ratio mid-drive motor structure: a high-speed-ratio mid-drive motor structure, comprising: Motor left cover 1, motor right cover 20 and motor housing 10 connecting the two; The motor stator 2 and motor rotor 3 are located inside the motor housing 10; Sun gear 4 is interference-fitted to motor rotor 3; A fixed internal gear ring 11 is interference-fitted with the motor housing 10; Planetary transmission assembly, comprising: The double planetary gear 12 meshes with the sun gear 4 and the fixed internal gear ring 11. The double planetary gear 12 has an input end gear and an output end gear. The planet carrier 21 supports the double planetary gear 12, and the double planetary gear 12 and the planet carrier 21 are fitted with a pin with clearance. Output mechanism, including: The output internal gear ring 13 meshes with the output end gear; Output flange 14 is interference-fitted with output internal gear ring 13; The output flange 14 is supported on the motor housing 10 by bearing 16; Clutch 17 is press-fitted onto output flange 14; The toothed sprocket support 19 mates with the outer ring of the clutch 17; Also includes: The centrally located motor has a separate crankshaft 5, which is equipped with a spline section; A dynamic torque sensor 6 is splinedly connected to the split crankshaft 5; The clutch support 9 is splinedly connected to the dynamic torque sensor 6, and the end of the clutch support 9 is integrated with a pawl and spring plate structure. The ratchet 18, which is connected to the sprocket support 19 by a thread, forms the clutch mechanism between the clutch support 9 and the sprocket support 19.

[0023] The planetary carrier 21 is supported by a bearing 15 between it and the output flange 14.

[0024] The motor housing 10 also includes a controller 7 and a controller housing 8, with the controller 7 electrically connected to the motor stator 2.

[0025] The input gear module of the double planetary gear 12 is greater than the output gear module, forming a two-stage reduction.

[0026] Clutch 17 is a one-way overrunning clutch, allowing the crankshaft support 19 to idle relative to the output flange 14. In practical use, after the motor is powered on, the motor rotor 3 drives the sun gear 4 to rotate, which in turn drives the double planetary gear 12 to rotate. Since the fixed internal gear ring 11 is fixed, the double planetary gear 12, while rotating around its own axis, also drives the planet carrier 21 to rotate. The planet carrier 21, through the bearing 15, drives the output flange 14 to rotate, and the output flange 14 transmits power through the output internal gear ring 13. When clutch control is required, the clutch mechanism enables the engagement and disengagement of power. During operation, the dynamic torque sensor 6 monitors the torque transmitted by the split crankshaft 5 of the centrally located motor in real time and feeds the data back to the controller 7. The controller 7 optimizes the motor control based on the torque data.

[0027] The above description is merely a preferred embodiment of this utility model and does not limit the scope of protection of this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any changes, modifications, substitutions, integrations, and parameter alterations made to these embodiments within the spirit and principles of this utility model, through conventional substitutions or methods that achieve the same function without departing from the principles and spirit of this utility model, fall within the scope of protection of this utility model.

Claims

1. A high-speed-ratio mid-mounted motor structure, characterized in that, include: Motor left cover (1), motor right cover (20) and motor housing (10) connecting the two; The motor stator (2) and motor rotor (3) are located inside the motor housing (10); Sun gear (4) is interference-fitted to motor rotor (3); A fixed internal gear ring (11) is interference-fitted to the motor housing (10); Planetary transmission assembly, comprising: A double planetary gear (12) meshes with the sun gear (4) and the fixed internal gear ring (11), the double planetary gear (12) having an input end gear and an output end gear; The planet carrier (21) supports the double planetary gear (12), and the double planetary gear (12) and the planet carrier (21) are fitted with a pin clearance. Output mechanism, including: Output internal gear ring (13) meshes with the output end gear; Output flange (14) is interference-fitted with output internal gear ring (13); The output flange (14) is supported on the motor housing (10) by bearing two (16). Clutch (17) press-fitted onto output flange (14). The toothed plate support (19) mates with the outer ring of the clutch (17).

2. The mid-mounted motor structure according to claim 1, characterized in that, Also includes: The split crankshaft (5) of the central motor is provided with a spline section; A dynamic torque sensor (6) is splinedly connected to the split crankshaft (5); The clutch support (9) is splinedly connected to the dynamic torque sensor (6), and the clutch support (9) has a pawl and spring plate structure integrated at its end; The ratchet (18) connected to the toothed sprocket support (19) by the thread forms the clutch mechanism between the clutch support (9) and the toothed sprocket support (19).

3. The mid-mounted motor structure according to claim 1, characterized in that: The planetary carrier (21) and the output flange (14) are supported by a bearing (15).

4. The mid-mounted motor structure according to claim 1, characterized in that: The motor housing (10) is also equipped with a controller (7) and a controller housing (8), and the controller (7) is electrically connected to the motor stator (2).

5. The mid-mounted motor structure according to claim 1, characterized in that: The input gear module of the double planetary gear (12) is greater than the output gear module, forming a two-stage reduction.

6. The mid-mounted motor structure according to any one of claims 1-5, characterized in that: The clutch (17) is a one-way overrunning clutch that allows the crank support (19) to idle relative to the output flange (14).

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