Abstract: An air meter for an internal combustion engine. The air intake passage of the internal combustion engine includes a main passage and an L-shaped auxiliary passage. The auxiliary passage includes a first flow passage, a second flow passage and a corner portion arrnaged at a corner thereof. The first flow passage communicates to the second flow passage through the corner portion. The first flow passage is disposed in parallel with the main passage and has a hot wire sensor arranged therein. The second flow passage is arranged perpendicularly to the main passage. The first flow passage has a circular radial cross section. The second flow passage is in the shape of a groove with a bottom, the groove having a square cross-section. The first flow passage is open to the corner portion at a level of the bottom of the second flow passage.

Abstract: An intake structure having a throttle body and an intake body connected to the upstream end of the throttle body and provided with a by-pass air passage for mounting an air flow meter. Locating construction is provided on the joint surfaces of the throttle body and the intake body so as to locate these bodies coaxially to each other.

Abstract: A control device for a throttle valve for use with an internal combustion engine installed in a vehicle. The device has a throttle valve shaft secured to the throttle valve, and a linkage to be driven by a linkage member including an accelerator wire for opening and closing the throttle valve. The linkage is a three-joint linkage mechanism including a throttle lever secured to the throttle valve shaft, a lever-mounting shaft secured to the throttle body, a drive lever rotatably mounted on the lever-mounting shaft, and a rod connecting the throttle lever and the drive lever.