device 2 with a main body 4 a throttle valve shaft 6 a throttle valve flap 8 and a cover 10 the adjusting device 2 contains a transmission housing 12 the transmission housing 12 is encompassed by the main body 4 the side walls of the main body 4 and the cover 10 the main body 4 also contains a servomotor 14 because the transmission housing 12 and the servomotor 14 are obscured by the main body 4 and the cover 10 in fig1 and are therefore not directly visible the reference lines of the reference numerals 12 and 14 are depicted in dashed form the transmission housing 12 contains a transmission 16 fig2 with a motor pinion 18 a drive gear 20 and a driven gear 22 because the motor pinion 18 and the driven gear 22 are obscured by the cover 10 in the viewing direction selected for fig2 these parts are depicted with dashed lines in fig2 during the manufacture of the adjusting device 2 after the servomotor 14 and the transmission 16 have been installed the cover 10 is attached to the main body 4 when fully assembled the circumference of the cover 10 is welded glued or clamped to the main body 4 the cover 10 is provided with a first rib 24 a and a second rib 24 b fig2 because the ribs 24 a and 24 b are situated on the side of the cover 10 oriented away from the viewer the ribs 24 a and 24 b are depicted with dashed lines in fig2 an axle 28 is formed.