AIR SUPPLY/EXHAUST OVERLAP CHANGING DEVICE FOR SUPERCHARGED DIESEL ENGINE

Japanese Patent JP3732431

B2

PROBLEM TO BE SOLVED: To provide an air supply/exhaust overlap changing device for a supercharged diesel engine capable of preventing backflow of exhaust to an air supply side without impairing starting performance with simple structure and preventing boosting insufficiency of exhaust.
SOLUTION: Rollers 22 and 16 at one end part of each oscillating arms 21 and 15 for air supply/exhaust valves are in rollable contact with cam surfaces of fixed cams 23 and 18 for air supply valves fixed to a cam shaft 17. The air supply/exhaust valves are operated by constant valve timing via a rocker arm by elevating/lowering of push rods 24 and 14. By rotatably connecting other end part of each of the oscillating arms 15 and 21 to a crankshaft 31 for switching timing and rotating the crankshaft 31 by 180°, oscillating fulcrums of the oscillating arms 15 and 21 are changed. Normal valve timing for opening/ closing the opening/closing timing of the air supply/exhaust valves by normal timing and starting valve timing for expediting the opening/closing timing for exhaust valves 12A and 12B and delaying the opening/closing timing of the air supply valve are switched to change overlap of the air supply/exhaust valves.

Takayuki Sugiyama
Susumu Kayamoto
Yoshiro Arai

JP2001279210A

January 05, 2006

September 14, 2001

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Kawasaki Heavy Industries, Ltd.

F01L1/18; F02D41/06; F01L1/34; F02D13/02; F02D45/00; (IPC1-7): F02D41/06; F01L1/18; F01L1/34; F02D13/02; F02D45/00

JP57010740A
JP8158897A
JP3271515A
JP10089066A
JP9324664A
JP11013569A
JP10220256A

Minoru Torinosu
Shinichi Nakajima

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