Two-step valve operating mechanism

Details Two-step valve operating mechanism Two-step valve operating mechanism

1990-12-14

1992-02-25

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9048, F01L 134, F01L 114

Patent

active

050903640

ABSTRACT:
A camshaft has, for each valve lifter, a high lift cam between two low lift cams, the high lift cam fitting within the envelope of the low lift cams. The lifter comprises an outer tappet elongated in the direction of the camshaft and slidably mounted in an elongated bore in a cam carrier. The outer tappet is contacted by both low lift cams and operates two valves simultaneously. An elongated bore extending transverse of the outer tappet carries an elongated inner tappet which is contacted by the high lift cam. A hydraulically actuated locking mechanism couples the tappets for movement together for high lift operation and unlocks for low lift operation to allow the inner tappet to idle in the outer tappet.

REFERENCES:
patent: 4164917 (1979-08-01), Glasson
patent: 4637357 (1987-01-01), Ohmi
patent: 4699094 (1987-10-01), Stegeman
patent: 4745888 (1988-05-01), Kapp
patent: 4793296 (1988-12-01), Inoue et al.
patent: 4887561 (1989-12-01), Kishi
patent: 4905639 (1990-03-01), Konno
patent: 4909195 (1990-03-01), Hasebe et al.
patent: 4926804 (1990-05-01), Fukuo
patent: 5036807 (1991-08-01), Kaneko
patent: 5042436 (1991-08-01), Yamamoto et al.
patent: 5042437 (1991-08-01), Sakuragi et al.

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