A mid-mounted motor for a tricycle with an outer rotor structure

Abstract

The present invention discloses a mid-mounted motor for a tricycle with an outer rotor structure, comprising a housing assembly, a connecting cover assembly, a side cover assembly, a stator assembly, a rotor assembly, a motor shaft, a planetary reduction mechanism, and a reduction box. A partition is provided in the housing assembly, the partition, the housing assembly, and the connecting cover assembly form a front cavity, the partition, the housing assembly, and the side cover assembly form a rear cavity, the stator assembly and the rotor assembly are located in the rear cavity, the planetary reduction mechanism is located in the front cavity, gear lubricating oil is provided in the front cavity, and insulating cooling oil is provided in the rear cavity. The motor shaft passes through the partition, the front part of the motor shaft is transmission-connected to the planetary reduction mechanism, the reduction box is fixed to the outside of the connecting cover assembly, and the reduction box is transmission-connected to the planetary reduction mechanism. Through the above design, the present invention enables the tricycle to have a greater load capacity, higher motor heat dissipation efficiency, and a better motor user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a mid-mounted motor for a tricycle with an outer rotor structure. Background Art

[0002] Most existing mid-mounted motors on the market directly drive the rear wheels through a chain or belt drive. However, this type of direct drive of the rear wheels by a mid-mounted motor significantly limits the power delivered, resulting in insufficient gradeability and, consequently, poor load carrying capacity. Furthermore, current mid-mounted motors dissipate heat solely through air, resulting in low heat dissipation efficiency. If the heat inside the motor cannot be dissipated in a timely manner, it can burn the coils. Consequently, mid-mounted motors currently have a short service life and a poor user experience. Therefore, improvements are needed. Summary of the Invention

[0003] The present invention addresses the defects of the prior art, such as poor load capacity of tricycles, low motor heat dissipation efficiency, and poor motor usage experience, and provides a new mid-mounted motor for tricycles with an outer rotor structure.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] A mid-mounted motor for a three-wheeled vehicle with an outer rotor structure includes a housing assembly, a connecting cover assembly, a side cover assembly, a stator assembly, a rotor assembly, and a motor shaft. The connecting cover assembly is connected to the front of the housing assembly, the side cover assembly is connected to the rear of the housing assembly, the rear of the stator assembly is fixed to the inner side of the side cover assembly, the rotor assembly is sleeved on the outer side of the stator assembly, and the rear part of the motor shaft is transmission-connected to the rotor assembly. The motor also includes a planetary reduction mechanism and a reduction box. A partition is provided in the housing assembly, the partition forms a front cavity with the housing assembly and the connecting cover assembly, the partition forms a rear cavity with the housing assembly and the side cover assembly, the stator assembly and the rotor assembly are located in the rear cavity, the planetary reduction mechanism is located in the front cavity, gear lubricating oil is provided in the front cavity, and insulating cooling oil is provided in the rear cavity. The motor shaft passes through the partition, the front part of the motor shaft is transmission-connected to the planetary reduction mechanism, the reduction box is fixed to the outer side of the connecting cover assembly, and the reduction box is transmission-connected to the planetary reduction mechanism.

[0006] The shell assembly, connecting cover assembly, and side cover assembly together constitute the main structure of the motor housing, which plays a role in sealing and protection. The stator assembly, rotor assembly, and motor shaft together constitute the main internal structure of the motor, which plays a role in providing and outputting power. The rear part of the stator assembly is fixed to the inner side of the side cover assembly, so that a larger contact surface is formed between the stator assembly and the side cover assembly, thereby more effectively transferring the heat during operation of the present invention and achieving more efficient heat dissipation. The rotor assembly is mounted on the outer side of the stator assembly to form an outer rotor structure, which makes the present invention have greater torque and better heat dissipation, and also improves the working efficiency and output power of the present invention under unstable loads. The rear part of the motor shaft is connected to the rotor assembly in a transmission manner, and the motor shaft plays the role of transmitting power. The planetary reduction mechanism and the reduction box are used to obtain greater torque, which plays a role in improving the load capacity of the tricycle. The partition is used to separate the front cavity and the rear cavity, so that the front cavity and the rear cavity do not affect each other, improving the stability of the various components in the present invention during operation, thereby extending the service life of the present invention and improving the user experience of the present invention. Gear lubricant is located within the front cavity, ensuring more stable and efficient operation of the planetary reduction mechanism while also providing heat dissipation and rust prevention. Insulating cooling oil is located within the rear cavity, effectively transferring heat generated during operation to the housing for efficient heat dissipation. The insulating cooling oil also forms an insulating film within the rear cavity, preventing oxidation and rusting of the stator and rotor assemblies.

[0007] Through the above design, the present invention makes the tricycle have a greater load capacity, higher motor heat dissipation efficiency, and better motor usage experience.

[0008] Preferably, in the above-mentioned mid-mounted motor for a tricycle with an outer rotor structure, both the side cover assembly and the connecting cover assembly are provided with oil-proof breathable valves.

[0009] The oil-proof breathable valve is designed to enhance the gas exchange capacity of the present invention, also facilitating hot and cold gas exchange. An oil-proof breathable membrane is installed within the valve, enabling gas exchange between the interior and exterior of the valve and ensuring pressure balance between the two. Furthermore, the membrane effectively blocks the oil within the valve, preventing leakage, while also blocking external moisture from entering. This provides a waterproof seal and effectively prevents rust and aging within the valve, thereby improving its performance and extending its service life.

[0010] Preferably, in the above-mentioned mid-mounted motor for a tricycle with an outer rotor structure, an annular groove structure is provided between the rotor assembly and the partition plate, and an oil stirring blade is provided on the upper part of the rotor assembly.

[0011] An annular groove structure is provided between the rotor assembly and the partition to accommodate more insulating cooling oil. The oil stirring blades agitate the insulating cooling oil, promoting its circulation within the device. This design further improves heat dissipation efficiency, service life, and user experience.

[0012] Preferably, the mid-mounted motor for a three-wheeled vehicle with an outer rotor structure described above, the stator assembly includes a stator bracket, a stator core, and a winding coil, the stator core is fixed to the stator bracket, the winding coil is fixed to the stator core, the stator bracket is fixed to the inner side of the side cover assembly, and the stator bracket and the side cover assembly are both made of aluminum.

[0013] This design allows the stator bracket to support the stator core, which in turn mounts the winding coils. This creates a larger contact surface between the stator bracket and the side cover assembly, effectively transferring heat during operation and achieving more efficient heat dissipation. Both the stator bracket and the side cover assembly are constructed of aluminum, further enhancing the heat dissipation performance of the stator assembly and, consequently, the heat dissipation efficiency of the present invention.

[0014] Preferably, in the above-mentioned mid-mounted motor for a three-wheeled vehicle with an outer rotor structure, the stator assembly, the rotor assembly, and the planetary reduction mechanism are coaxially distributed on the motor shaft.

[0015] Through the above design, the coaxiality requirements of the stator assembly, rotor assembly, and planetary reduction mechanism can be effectively guaranteed, and the mechanical loss caused by positioning deviation can be reduced, thereby improving the service life and user experience of the present invention.

[0016] Preferably, in the above-mentioned mid-mounted motor for a three-wheeled vehicle with an outer rotor structure, the reduction gear box is a single-stage gear reduction box or a two-stage gear reduction box.

[0017] Through the above design, the present invention can match the reduction gearbox according to actual needs, thereby improving the adaptability and applicability of the present invention in practical applications.

[0018] Preferably, in the above-mentioned mid-mounted motor for a three-wheeled vehicle with an outer rotor structure, an O-ring is provided between the side cover assembly and the housing assembly, a connecting cover plane sealing gasket is provided between the connecting cover assembly and the reduction gearbox, and a reduction gearbox plane sealing gasket is provided in the reduction gearbox.

[0019] This design effectively ensures the sealing performance requirements of the various components of the present invention, resulting in improved sealing performance. Furthermore, this design, combined with the oil-proof breathable valve, achieves multiple waterproof sealing functions, effectively preventing internal rust and aging, thereby improving the performance and service life of the present invention.

[0020] Preferably, in the above-mentioned mid-mounted motor for a tricycle with an outer rotor structure, the rotor assembly is U-shaped, a magnetic steel sheet is provided inside the rotor assembly, and the rotor assembly is connected to the rear of the motor shaft by screws.

[0021] The U-shaped rotor assembly optimizes the outer rotor structure, resulting in higher efficiency. The rotor assembly incorporates magnetic steel sheets, which offer excellent corrosion resistance and thermal stability, further enhancing the user experience. The rotor assembly is connected to the motor shaft via screws, resulting in a simple structure and easy assembly and disassembly, extending the lifespan of the present invention.

[0022] Preferably, the above-mentioned mid-mounted motor for a three-wheeled vehicle with an outer rotor structure further includes an output flange, the planetary reduction mechanism includes a planetary carrier, a sun gear, planetary gears, and an inner ring gear, the inner ring gear is fixed to the inner side of the housing assembly by a pin, the sun gear is connected to the motor shaft by a key, the planetary gears are respectively connected to the sun gear and the inner ring gear, the output flange, the planetary gears, and the planetary carrier are integrally connected by screws, and the output flange is connected to the reduction box by a coupling or a spline.

[0023] The output flange and planetary carrier function to transmit power. The sun gear, planetary gears, and internal ring gear collectively reduce speed, generating greater torque and thus improving the tricycle's load capacity. The output flange, planetary gears, and planetary carrier are integrally connected via screws, further stabilizing the internal transmission and improving transmission efficiency. The output flange is connected to the reduction gearbox via a coupling or spline, providing high load capacity, ease of machining, and enhanced coaxiality.

[0024] Preferably, in the above-mentioned mid-mounted motor for a tricycle with an outer rotor structure, the reduction box is a gear reduction box, a chain reduction box or a belt reduction box.

[0025] Through the above design, the present invention can modify the reduction gearbox according to actual needs, thereby improving the adaptability and applicability of the present invention in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention; DETAILED DESCRIPTION

[0027] The following is combined with Figure 1 The present invention is further described in detail with specific embodiments, but they are not intended to limit the present invention:

[0028] Example 1

[0029] A mid-mounted motor for a tricycle with an outer rotor structure includes a housing assembly 4, a connecting cover assembly 3, a side cover assembly 6, a stator assembly 7, a rotor assembly 5, and a motor shaft 8. The connecting cover assembly 3 is connected to the front of the housing assembly 4, the side cover assembly 6 is connected to the rear of the housing assembly 4, the rear of the stator assembly 7 is fixed to the inner side of the side cover assembly 6, the rotor assembly 5 is sleeved on the outer side of the stator assembly 7, the rear of the motor shaft 8 is transmission-connected to the rotor assembly 5, and also includes a planetary reduction mechanism 9 and a reduction box 1. A partition 41 is provided in the housing assembly 4, and the partition 41 is in contact with the rotor assembly 5. The housing assembly 4 and the connecting cover assembly 3 form a front cavity, the partition 41 and the housing assembly 4 and the side cover assembly 6 form a rear cavity, the stator assembly 7 and the rotor assembly 5 are located in the rear cavity, the planetary reduction mechanism 9 is located in the front cavity, gear lubricating oil 42 is provided in the front cavity, and insulating cooling oil 43 is provided in the rear cavity, the motor shaft 8 passes through the partition 41, and the front part of the motor shaft 8 is transmission-connected to the planetary reduction mechanism 9, the reduction box 1 is fixed to the outside of the connecting cover assembly 3, and the reduction box 1 is transmission-connected to the planetary reduction mechanism 9.

[0030] During operation, stator assembly 7 is energized, thereby driving rotor assembly 5 to rotate. Rotor assembly 5 stirs insulating cooling oil 43 and rotates motor shaft 8. Motor shaft 8 transmits power to planetary reduction mechanism 9, which transmits power to reduction gearbox 1, which ultimately outputs the power.

[0031] Preferably, both the side cover assembly 6 and the connection cover assembly 3 are provided with an oil-proof breathable valve 2.

[0032] Preferably, an annular groove structure is provided between the rotor assembly 5 and the partition plate 41 , and an oil stirring blade 51 is provided on the upper portion of the rotor assembly 5 .

[0033] Preferably, the stator assembly 7 includes a stator bracket 71, a stator core 72, and a winding coil 73. The stator core 72 is fixed to the stator bracket 71, the winding coil 73 is fixed to the stator core 72, and the stator bracket 71 is fixed to the inner side of the side cover assembly 6. The stator bracket 71 and the side cover assembly 6 are both made of aluminum.

[0034] Preferably, the stator assembly 7 , the rotor assembly 5 , and the planetary reduction mechanism 9 are coaxially distributed on the motor shaft 8 .

[0035] Preferably, the reduction box 1 is a first-stage gear reduction box or a second-stage gear reduction box.

[0036] Preferably, an O-type rubber sealing ring 61 is provided between the side cover assembly 6 and the shell assembly 4, a connecting cover plane sealing gasket 31 is provided between the connecting cover assembly 3 and the reduction box 1, and a reduction box plane sealing gasket 11 is provided in the reduction box 1.

[0037] Preferably, the rotor assembly 5 is U-shaped, a magnetic steel sheet is provided inside the rotor assembly 5, and the rotor assembly 5 is connected to the rear of the motor shaft 8 by screws.

[0038] Preferably, it also includes an output flange 81, and the planetary reduction mechanism 9 includes a planetary carrier 91, a sun gear 92, a planetary gear 93, and an inner ring gear 94. The inner ring gear 94 is fixed to the inner side of the housing assembly 4 by a pin, and the sun gear 92 is connected to the motor shaft 8 by a key. The planetary gear 93 is respectively connected to the sun gear 92 and the inner ring gear 94 by transmission. The output flange 81, the planetary gear 93, and the planetary carrier 91 are integrally connected by screws, and the output flange 81 is connected to the reduction box 1 by a coupling or a spline.

[0039] Preferably, the reduction box 1 is a gear reduction box, a chain reduction box or a belt reduction box.

[0040] More specifically, during operation, winding coil 73 is energized, driving rotor assembly 5 to rotate. Rotor assembly 5 stirs insulating cooling oil 43 via oil stirring blades 51, driving motor shaft 8 to rotate. Motor shaft 8 transmits power to sun gear 92, which in turn rotates planetary gears 93. Ring gear 94 is stationary, causing planetary gears 93 to rotate while simultaneously orbiting around sun gear 92. The orbital rotation of planetary gears 93 drives integrated rotation of planetary carrier 91 and output flange 81. Output flange 81 then transmits power to reduction gearbox 1, which ultimately outputs the power.

[0041] In short, the above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A mid-mounted motor for a three-wheeled vehicle with an outer rotor structure, comprising a housing assembly (4), a connecting cover assembly (3), a side cover assembly (6), a stator assembly (7), a rotor assembly (5), and a motor shaft (8), wherein the connecting cover assembly (3) is connected to the front portion of the housing assembly (4), the side cover assembly (6) is connected to the rear portion of the housing assembly (4), the rear portion of the stator assembly (7) is fixed to the inner side of the side cover assembly (6), the rotor assembly (5) is sleeved on the outer side of the stator assembly (7), and the rear portion of the motor shaft (8) is transmission-connected to the rotor assembly (5), characterized in that: The invention also includes a planetary reduction mechanism (9), a reduction box (1), and an output flange (81). A partition (41) is provided in the housing assembly (4). The partition (41), the housing assembly (4), and the connecting cover assembly (3) form a front cavity. The partition (41), the housing assembly (4), and the side cover assembly (6) form a rear cavity. The stator assembly (7) and the rotor assembly (5) are located in the rear cavity. The planetary reduction mechanism (9) is located in the front cavity. Gear lubricating oil (42) is provided in the front cavity. Insulating cooling oil (43) is provided in the rear cavity. The motor shaft (8) passes through the partition (41). The front part of the motor shaft (8) is in transmission connection with the planetary reduction mechanism (9). The reduction box (1) is fixed to the connecting cover. On the outside of the assembly (3), the reduction box (1) is transmission-connected to the planetary reduction mechanism (9), the side cover assembly (6) and the connecting cover assembly (3) are both provided with an oil-proof breathable valve (2), an annular groove structure is provided between the rotor assembly (5) and the partition (41), an oil stirring blade (51) is provided on the upper part of the rotor assembly (5), the side cover assembly (6) is made of aluminum, an O-type rubber sealing ring (61) is provided between the side cover assembly (6) and the housing assembly (4), a connecting cover plane sealing gasket (31) is provided between the connecting cover assembly (3) and the reduction box (1), a reduction box plane sealing gasket (11) is provided in the reduction box (1), and the output flange (81) is connected to the reduction box (1) through a coupling or a spline.

2. The mid-mounted motor for a three-wheeled vehicle with an outer rotor structure according to claim 1, characterized in that: The stator assembly (7) comprises a stator bracket (71), a stator core (72), and a winding coil (73); the stator core (72) is fixed to the stator bracket (71); the winding coil (73) is fixed to the stator core (72); the stator bracket (71) is fixed to the inner side of the side cover assembly (6); and the stator bracket (71) is made of aluminum.

3. The mid-mounted motor for a three-wheeled vehicle with an outer rotor structure according to claim 1, characterized in that: The stator assembly (7), the rotor assembly (5), and the planetary reduction mechanism (9) are coaxially distributed on the motor shaft (8).

4. The mid-mounted motor for a three-wheeled vehicle with an outer rotor structure according to claim 1, characterized in that: The reduction box (1) is a first-stage gear reduction box or a second-stage gear reduction box.

5. The mid-mounted motor for a three-wheeled vehicle with an outer rotor structure according to claim 1, characterized in that: The rotor assembly (5) is U-shaped, a magnetic steel sheet is provided inside the rotor assembly (5), and the rotor assembly (5) is connected to the rear of the motor shaft (8) via screws.

6. The mid-mounted motor for a three-wheeled vehicle with an outer rotor structure according to claim 1, characterized in that: The planetary reduction mechanism (9) comprises a planetary carrier (91), a sun gear (92), a planetary gear (93), and an inner gear ring (94); the inner gear ring (94) is fixed to the inner side of the housing assembly (4) by a pin; the sun gear (92) is connected to the motor shaft (8) by a key; the planetary gear (93) is respectively connected to the sun gear (92) and the inner gear ring (94) by transmission; the output flange (81), the planetary gear (93), and the planetary carrier (91) are integrally connected by screws.

7. The mid-mounted motor for a three-wheeled vehicle with an outer rotor structure according to claim 1, characterized in that: The reduction box (1) is a gear reduction box, a chain reduction box or a belt reduction box.

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