Easy-to-assemble central motor adopting first-stage gear speed reduction transmission

Abstract

The invention discloses an easy-to-assemble central motor adopting first-stage gear speed reduction transmission. The central motor comprises a shell, and a motor core, a middle shaft, a one-way clutch, a first-stage gear reduction mechanism and a crankset positioning shaft sleeve which are installed in the shell, and the crankset positioning shaft sleeve is arranged on the middle shaft and used for fixing a crankset. The motor core is in the form of an outer rotor and an inner stator and comprises a rotor, a stator and a core shaft parallel to the middle shaft, and the stator comprises an annular stator support arranged on the periphery of the core shaft and fixed to the inner wall of the shell, and a stator coil thereof. The one-way clutch is characterized in that the one-way clutch is arranged on the core shaft and is connected with the rotor; the annular stator support and the shell are respectively provided with at least one machine core shaft bearing used for supporting the coreshaft; one end of the core shaft extends out of the annular stator support to form a cantilever; and the cantilever is in transmission connection with the crankset positioning shaft sleeve through thefirst-stage gear speed reduction mechanism. On the basis of keeping the functions of the original central motor, the motor is easier to assemble and lower in production cost, and the production efficiency can be remarkably improved.

Description

technical field [0001] The invention relates to an easy-to-assemble mid-mounted motor adopting one-stage gear reduction transmission. Background technique [0002] The mid-mounted motor is the core power component of an electric bicycle. At present, the development of the mid-mounted motor in the industry is based on compact structure, small size, and large output torque. [0003] The applicant originally designed a compact mid-mounted motor with one-stage gear reduction transmission. For details, see the authorized invention patent, the patent number is ZL201920051541.5. The structural feature of this mid-mounted motor is that the gear reduction mechanism only adopts a first-stage gear reduction transmission in which the large and small gears mesh, and the large gear is positioned by the central shaft. Parts, so that the volume of the housing is further reduced, the motor is more compact, and there are fewer parts, so that the assembly is convenient and the production is c...

AI Technical Summary

Problems solved by technology

[0006] 1) The structure is complex, the assembly is difficult and cumbersome, resulting in low production efficiency;

[0007] 2) Due to the size of the large gear, the size of the one-way clutch must be large, and the torque it can withstand is also large, which makes the selection cost of the one-way clutch relatively high;

[0008] 3) The front end of the inner ring of the one-way clutch needs to be formed with a tooth plate positioning sleeve, which not only makes it difficult to manufacture the one-way clutch and increases the cost, but also needs to design a special one-way clutch bearing on the center shaft to support the one-way clutch and enhance stability. Leading to more parts and more cost

But knocking is easy to damage the shaft teeth or pinions on the movement shaft

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