Gear shifting mechanism and method of transmission and vehicle

Abstract

The invention discloses a gear shifting mechanism and method of a transmission and a vehicle. The gear shifting mechanism and method are particularly suitable for transmissions of new energy vehicles.The gear shifting mechanism adopts a gear shifting drum type structure. Shifting forks are connected with gear shifting drums through connection pieces. Lubricating oil channels are additionally arranged on the shifting forks, so that lubrication of needle bearings is achieved, the gear shifting force can be effectively reduced, and gear shifting smoothness is improved. Meanwhile, the torque of the motor drives the gear shifting drums through a worm and gear mechanism, the executing motor and the gear shifting drums are perpendicularly arranged, so that the occupied space is small, and the structure is compact. Besides, when the motor drives the gear shifting drums to rotate, since the path of a rotating guide groove on the outer surface of each gear shifting drum is designed in advance,the shifting forks can move according to the pre-designed path, and then sequential gear shifting is achieved.

Description

technical field [0001] The invention relates to the field of transmissions of new energy vehicles, in particular to a shifting mechanism of a transmission. Background technique [0002] With the increasing depletion of world energy and the impact of the global environment, new energy vehicles have become the focus of the automotive industry. Compared with traditional vehicles, the power source of new energy vehicles has changed from the engine to the drive motor. Due to environmental constraints, the vehicle electric drive system is different from the ordinary electric drive system. It requires higher operating performance, specific power, and adaptability to harsher working environments. [0003] At present, most of the transmissions are still XY shift mechanisms that select gears first and then shift gears. Due to its structural limitations, there are risks of jumping gears and disorderly gears during the gear shifting process, resulting in gear shifting stagnation. In thi...

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Problems solved by technology

[0003] At present, most of the transmissions are still XY shift mechanisms that select gears first and then shift gears. Due to its structural limitations, there are risks of jumping gears and disorderly gears during the gear shifting process, resulting in gear shifting stagnation. In this case, Not only will it reduce the quality of shifting, but it will also cause varying degrees of damage to the transmission and affect its service life. There are also a few transmissions that use a shifting drum-type shifting mechanism, but the executive motor directly drives the shifting drum without amplifying torque conversion in the middle. Mechanism, resulting in a large volume of the motor, and the coaxial arrangement of the executive motor and the shift drum takes up a large space and the structure is not compact enough

[0004] Moreover, in the shifting drum type shifting mechanism adopted in the prior art, the guide pin fits between the shift fork and the shift drum, and the guide pin is fixed on the shift fork. The guide pin does not rotate relative to each other during the shifting process, which belongs to sliding friction. , the friction force is large, resulting in a large shifting force, and the guide pin is prone to jamming at the corner of the guide groove of the shift drum, which affects the smoothness of shifting, and the guide pin is generally arranged in the guide hole of the shift fork shaft on the shift fork It is far away from the stress point of the shift fork on the extension plate or on the extension plate. The shift fork is easy to tilt and deform during the shifting process, resulting in a stuck feeling when the shift gear sleeve is combined with the gear, and the impact is severe during the shifting process. , it is easy to cause the wear of the guide pin and affect the service life of the shifting mechanism

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