Patent ID: 7631628

Claim:
An engine intake control system in which a surge chamber communicating with an air inlet, a first intake passage that has an upstream end portion and a downstream end portion opening in the surge chamber, and a second intake passage that has an upstream end portion opening in the surge chamber so as to oppose the downstream end portion of the first intake passage across a gap and a downstream end portion connected to an intake port of an engine are formed in an intake manifold mounted on the engine, a sleeve-shaped valve body is slidably fitted around one of the opposing end portions, that is, the first intake passage end portion, of the first and second intake passages, the valve body moving between a first position in which the valve body is distanced from the other of the opposing end portions, that is, the second intake passage end portion, and a second position in which the valve body is in contact with the second intake passage end portion, and an actuator is connected to the valve body via a valve operating system for operating the valve body, wherein a linear motion guide bearing system for guiding the valve body in a direction of movement thereof is provided between the intake manifold and the valve body, a rail of the linear motion guide bearing system extending in the direction of movement of the valve body is secured to a support post fixedly provided on the intake manifold, and a slider of the linear motion guide bearing system movably straddle-mounted on the rail is secured to the valve body.