Patent ID: 8783225

Claim:
An intake device for an internal combustion engine, comprising: a casing defining an intake passage communicating with a combustion chamber of the internal combustion engine; a valve rotatably contained in the casing to open or close the intake passage; a shaft supporting the valve; and an actuator including: a motor as a power source, a speed reduction mechanism which reduces a rotational rate of the motor and includes a worm gear fixed to a motor shaft of the motor, a helical gear meshing with the worm gear, and a spur gear disposed coaxially with the helical gear and an output gear meshing with the spur gear, and a transmission mechanism which transmits torque of the motor to the shaft from the output gear of the speed reduction mechanism, wherein the transmission mechanism includes a first connection member which is integrally and rotatably connected to the output gear, a second connection member which is integrally and rotatably connected to the shaft, and an impact absorbing member held between the first connection member and the second connection member, the first connection member includes a plurality of first protrusions, the second connection member includes a plurality of second protrusions, and the first protrusions and the second protrusions are alternately arranged in a rotational direction of the transmission mechanism, and the impact absorbing member includes a plurality of compressive deformation parts which are compressively deformable in the rotational direction of the transmission mechanism and are respectively inserted and located between the first and second protrusions that are adjacent to each other in the rotational direction.