Valve timing changing apparatus for internal combustion engine

Details Valve timing changing apparatus for internal combustion engine Valve timing changing apparatus for internal combustion engine

1998-11-04

2000-10-24

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, 123 9031, F01L 1344, F02D 1302

Patent

active

06135077&

ABSTRACT:
A valve timing changing apparatus for changing valve timings of intake and exhaust valves inhibits a deterioration in the precision of a change of a valve overlap period. A first variable valve timing mechanism (first VVT) is mounted to an intake cam shaft, and a second variable valve timing mechanism (second VVT) is mounted to a crank shaft. A timing belt drivingly couples a cam pulley mounted to an exhaust cam shaft, a cam pulley of the first VVT, and a cam pulley of the second VVT to one another. The first VVT changes a rotational phase of the intake cam shaft so as to change a valve timing of intake valves. The second VVT changes rotational phases of both the intake and exhaust cam shafts so as to simultaneously change valve timings of the intake and exhaust valves.

REFERENCES:
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Moriya, Yoshihito et al., A Newly Developed Intelligent Variable Valve Timing System--Continously Controlled Cam Phasing as Aplied to a New 3 Liter Inline 6 Engine; Copyright 1996 Society of Automotive Engineers, Inc.; pp. 1-7.

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