Valve-operating device for engine with two banks and variable va

Details Valve-operating device for engine with two banks and variable va Valve-operating device for engine with two banks and variable va

1998-03-10

1999-08-03

Lo, Wellun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 1300

Patent

active

059311290

ABSTRACT:
A valve-operating device for an internal combustion engine equipped with two cylinder banks each having a variable valve timing and working angle mechanism comprises a drive shaft, a cylindrical hollow camshaft fitted to an outer periphery of the drive shaft to be rotatable relatively about the drive shaft, a non-uniform velocity coupling including an annular disc disposed between the drive shaft and the camshaft for transmitting motion of rotation from the drive shaft to the camshaft, permitting a phase change of the camshaft relative to the drive shaft with non-uniform rotation during eccentric motion of the annular disc, and a control housing rotatably supporting the annular disc. Also provided is a decentering mechanism supporting the control housing rockably to produce the eccentric motion of the annular disc. A locus of eccentric motion of the center of the annular disc arranged in the left bank and a locus of eccentric motion of the center of the annular disc arranged in the right bank are essentially symmetrical with respect to the line perpendicular to a line segment between and including two central axes of said drive shafts of the two cylinder banks. A direction of eccentric motion of the center of the annular disc arranged in the right bank is opposite to a direction of eccentric motion of the center of the annular disc arranged in the left bank.

REFERENCES:
patent: 5365896 (1994-11-01), Hara et al.
patent: 5557983 (1996-09-01), Hara et al.
patent: 5592908 (1997-01-01), Hara et al.
patent: 5636603 (1997-06-01), Nakamura et al.

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