Single-actuator two-gear planetary gear transmission

Abstract

A single-actuator two-gear planetary gear transmission comprises a shell, a planetary row, an actuator assembly, a front brake assembly and a rear brake assembly, the front brake assembly comprises a blocking piece arranged in the middle of the shell, a wedge-shaped block assembly is arranged on the front side of the blocking piece, the actuator assembly is arranged on the front side of the wedge-shaped block assembly, and the rear brake assembly is arranged on the rear side of the blocking piece and connected with the actuator assembly through a transmission rod. The transmission only uses one actuator, so that the cost is saved, the occupied space is reduced, and installation is convenient; no one-way clutch is needed, but impact can be avoided during gear shifting, the cost is saved, the occupied space is reduced, and installation is convenient; in the gear shifting process, only one actuator needs to be controlled to work, coordination to the action time of two actuators does not exist, control is simple, and the possibility that two gear shifting execution units are locked at the same time due to control errors does not exist; and the gear shifting process is smooth and free of power interruption.

Description

technical field [0001] The invention relates to a single-actuator two-speed planetary gear transmission, in particular to an electric vehicle planetary gear transmission. Background technique [0002] With the development of electric vehicles, the development of a new type of transmission with fewer gears has become a hot topic. Each shift element in a conventional transmission needs an actuator to drive, so the gear switching of the existing low-speed transmission needs to be realized by controlling two or more actuators at the same time. [0003] For example, the prior patent with the patent number of CN201210472213.5 discloses a two-speed transmission for electric vehicles. The electromagnetic brake B1 and the electromagnetic clutch C1 respectively require an electromagnetic actuator, and the two should be controlled simultaneously when shifting gears. Actuator; in the previous patent with the patent number CN201710651749.6, a single-row planetary gear train two-speed dr...

AI Technical Summary

Problems solved by technology

Two or more actuators lead to high manufacturing cost and complex assembly process of the transmission; and it is necessary to precisely control the action time difference of each actuator to match the motor speed when shifting gears, otherwise it will cause shifting shock and even transmission failure And other issues

However, an actuator needs to provide the force of separating the clutch and pressing the brake at the same time. In addition, to further effectively reduce the impact of shifting, it is necessary to install an additional one-way clutch

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