Electronic control actuator, exhaust gas treatment system, and vehicle comprising exhaust gas treatment system

An electronic control actuator, comprising:

• a lower housing and an upper housing, the lower housing or the upper housing comprising a plurality of first matching holes, and the lower housing and the upper housing cooperating to form an installation space;
• an isolation plate disposed between the lower housing and the upper housing, the isolation plate comprising a plurality of second matching holes, and a plurality of locating pins respectively passing through the plurality of first matching holes and the plurality of second matching holes;
• and
• a compact gear assembly and a drive motor both disposed in the installation space, and the compact gear assembly being cooperatively connected to the drive motor;
• wherein:
• the compact gear assembly comprises:
• a first reduction gear, in transmission connection to a motor shaft of the drive motor at a first location;
• a second reduction gear, fixedly coaxially connected to the first reduction gear;
• and
• a sector gear, the sector gear being meshed with the second reduction gear at a second location;
• the sector gear being coaxially rotationally connected to an output shaft;
• and the sector gear comprising a matching groove;
• the motor shaft extends through the matching groove in the sector gear;
• the second reduction gear is disposed between the drive motor and the first reduction gear;
• whereby both the second reduction gear and the sector gear are disposed between the drive motor and the first reduction gear;
• and the second location is disposed adjacent to the drive motor with respect to the first location along an axial direction of the motor shaft;
• the lower housing comprises a limiting part disposed on one side of the locating pins away from the first matching holes;
• the limiting part comprises a support surface, and when the lower housing is cooperatively connected to the upper housing, the support surface abuts against one side of the isolation plate away from the first matching holes;
• and
• the lower housing comprises a side wall, a motor-mounting part, an air-cooled element, and a water-cooled element;
• the motor-mounting part is disposed in a middle of the side wall;
• the air-cooled element is disposed around the motor-mounting part;
• the water-cooled element is disposed in the side wall and corresponds to the air-cooled part;
• and the water-cooled element is disposed around the motor-mounting part.