Patent ID: 6209501
Filing Date: 2001-04-03
Classification: F02B,F02M,Y02T

Abstract:
A suction system for a multi-cylinder internal combustion engine having branch pipes of an intake manifold disposed on and connected to a cylinder head through a swirl valve assembly, said suction system comprising:first and second intake passages provided in a main body of the swirl valve assembly and a swirl valve disposed in one of the first and second intake passages, the first and second intake passages communicating with a single combustion chamber;a tank chamber provided in the main body and formed between first and second intake passage walls and a peripheral wall surrounding the first and second intake passage walls, the first and second intake passage walls forming the first and second intake passages, the tank chamber being defined and blocked by being connected to one of the branch pipes and the cylinder head;a negative pressure introduction passage provided in the main body for introducing negative suction pressure from the other of the first and second intake passages into the tank chamber, the tank chamber being divided into first and second tank chamber portions, the first tank chamber portion communicating with the negative pressure introduction passage, the second tank chamber portion being isolated from the first tank chamber portion; anda communication pipe for providing communication between the first and second tank chamber portions and a check valve disposed in the communication pipe for permitting the negative suction pressure to be introduced into the second tank chamber portion from the first tank chamber portion.