Variable valve timing system having rotational vibration damper

Details Variable valve timing system having rotational vibration damper Variable valve timing system having rotational vibration damper

1995-03-24

1996-07-16

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

74568R, 464 2, 123 9031, F01L 134

Patent

active

055357059

ABSTRACT:
A variable valve timing system includes helical splines to effect a relative rotation between an input member and an output member. The output member drives an intake and an exhaust valve against the urging force of a valve spring. The valve spring gives an undesired torque to the output member. The helical splines have backlash and the undesired torque causes a hitting noise. Therefore, a guide depression filled with viscous fluid is formed in front of the input member and a projection located and moved in the depression is formed in front of the output member. The depression and the projection with the viscous fluid form a damper to absorb the undesired torque.

REFERENCES:
patent: 5067450 (1991-11-01), Kano et al.
patent: 5080052 (1992-01-01), Hotta et al.
patent: 5090365 (1992-02-01), Hotta et al.
patent: 5215046 (1993-06-01), Takenaka et al.
patent: 5341777 (1994-08-01), Miura et al.
patent: 5377639 (1995-01-01), Nakadouzono et al.

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