Intake- and/or exhaust-valve timing control system for internal

Details Intake- and/or exhaust-valve timing control system for internal Intake- and/or exhaust-valve timing control system for internal

1989-09-25

1990-06-26

Okonsky, David A.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 134

Patent

active

049362640

ABSTRACT:
An intake- and/or exhaust-valve variable timing control system for an internal combustion engine comprises a ring gear member disposed between a timing pulley and a camshaft and a drive mechanism for drivingly controlling the ring gear member via oil pressure depending upon the operating state of the engine. The ring gear member includes first and second ring gear elements having essentially the same geometry of inner and outer toothed portions and a backlash eliminator associated with the two ring gear elements. At least one of the two meshing pairs of toothed portions is helical. The timing control system also includes a stepped end provided at the rear end of the inner toothed portion of the timing pulley, an abutting portion provided on the outer peripheral surface of the second ring gear element, for abutting said stepped end to restrict an axial sliding movement of the second ring gear element to the outermost end of said timing pulley, and an opening defined in the vicinity of the outermost end of said timing pulley, for permitting the first ring gear element to axially move away from the second ring gear element.

REFERENCES:
patent: 4231330 (1980-11-01), Garcea
patent: 4494496 (1985-01-01), Nakamura et al.
patent: 4535731 (1985-08-01), Banfi
patent: 4811698 (1989-03-01), Akasaka et al.
patent: 4856465 (1989-08-01), Denz et al.
patent: 4862843 (1989-09-01), Kawamoto et al.

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