Magnetic control gear shifting hub

Abstract

The invention discloses a magnetic control gear shifting hub, and belongs to the technical field of wheel power transmission. The gearbox comprises a motor spindle and a hub steel ring, a gearbox body is formed in a hub cavity, and a clutch and a gear set are arranged in the gearbox body. An electric suction cup is installed on a motor spindle, a magnetic conductive ring and a coil annular groove are arranged on the side wall of the side, adjacent to the pressing disc, of the electric suction cup, and a coil is arranged in the coil annular groove; and a concave cavity is formed in the portion, close to the protruding column, of the motor left cover. The driven friction plate and the driving friction plate are located on the protruding disc and located in the concave cavity. The clutch gear shifting mechanism is installed on the motor in the hub, wherein the electric suction cup is arranged outside the motor shell, the motor is an independent part and does not interfere with each other; therefore, heat generated when the electric suction cup is powered on to work cannot be overlapped in the motor at the same time, a motor heating source is not additionally added, so that the motor is protected, and the electric suction cup is prevented from being burnt out due to overtemperature caused by superposition of heat generated by working of the motor.

Description

technical field [0001] A magnetically controlled shifting wheel hub belongs to the technical field of wheel power transmission, in particular to wheel power transmission devices of electric motorcycles and electric bicycles. Background technique [0002] Most of the current electric vehicles are directly driven by hub motors, especially electric two-wheeled vehicles, which have the disadvantages of small size, limited battery compartment space, and limited battery capacity, so the size and power of the motor cannot be made larger. If an electric vehicle wants to drive on complex terrain such as mountains and hills, it needs more power and consumes more power. However, the reality is that the required power cannot be met, making it difficult for electric vehicles to drive on complex terrain such as mountains and hills. , thereby limiting the scope of use of electric vehicles. In addition, although a speed changer is arranged in the hub motor at present, its high-speed direct...

AI Technical Summary

Problems solved by technology

[0002] Most of the current electric vehicles use the direct drive mode of hub motors, especially electric two-wheeled vehicles, which have the disadvantages of small size, limited battery compartment space, and limited battery capacity, so the size and power of the motor cannot be made larger

If an electric vehicle wants to drive on complex terrain such as mountains and hills, it needs more power and consumes more power. However, the reality is that the required power cannot be met, making it difficult for electric vehicles to drive on complex terrain such as mountains and hills. , thus limiting the scope of use of electric vehicles

In addition, although a speed changer is arranged in the hub motor at present, its high-speed direct drive block directly drives the wheels by the electromagnetic clutch, and additionally increases a large electric energy loss (the power consumption loss of the electromagnetic clutch work) at the same time. The space of the wheel hub motor is limited, the size and power of the electromagnetic clutch cannot be enlarged, and the electromagnetic suction generated by it is not enough to tighten the friction plate to drive the outer wheel hub to directly drive the wheel to drive with a load. If the clutch is used forcibly, it will cause the clutch to slip and fail, and the slip time is too long. Clutch friction The heat transferred to the motor makes the motor winding easy to burn the motor when the high temperature increases sharply. Due to the slipping of the clutch, if the vehicle suddenly has no power output when driving on a slope, it will cause safety hazards such as backtracking.

At the same time, the transmission part adopts the ratchet tooth clutch method to rely on the centrifugal force to work with the gear when it reaches a certain speed. Due to the reaction force generated by the weight of the vehicle and the weight of the passenger, it is easy to damage the gear, and there will be impact noise, rushing and other adverse conditions when riding; There are also electric vehicles that rely on the motor to rotate clockwise and counterclockwise to achieve gear shifting. When shifting gears, the motor will pause for a certain period of time. It takes a buffer time to complete the gear shifting, so the human body does not feel comfortable when shifting gears. The response is slow, and sometimes the reverse speed of the cart is too fast, and there will be a phenomenon of jamming; for example, the Chinese patent No. 201120043762.1 that the applicant once applied for discloses "a shifting wheel hub for electric vehicles", which relies on throwing blocks to push the clutch under the action of centrifugal force Combination of friction plates, due to the limited size of the hub motor, the throwing block cannot be made larger and heavier. The hub motor works in a direct drive mode, so the motor speed will not be too high. This condition cannot allow the throwing block to get enough centrifugal force to compress the friction plate. The propulsion clutch directly drives the wheels to run under load, if the drive is overloaded, the clutch and motor will be burned

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