Valve actuating apparatus

Details Valve actuating apparatus Valve actuating apparatus

1992-11-06

1993-08-31

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9039, F01L 134

Patent

active

052399524

ABSTRACT:
A valve actuating system comprises a rocker arm supported by a rocker shaft for contacting with a first or low speed profiled cam lobe and a valve stem, a lost motion mechanism, a free cam follower and a prop. The lost motion mechanism includes a stationary portion defining a pedestal fixed to the rocker arm and a moveable portion received by the stationary portion. The free cam follower includes a cam face adapted for contacting with a second or high speed profiled cam lobe. The prop is supported by the free cam follower for movement between a first position in which the prop supports the free cam follower on the moveable portion of the lost motion mechanism and a second position in which the prop supports the free cam follower on the pedestal of the lost motion mechanism. The free cam follower has a bore and the prop has a plunger part received in the bore and cooperating with the bore defining wall for unitary rotation of the prop with the free cam follower. The lost motion mechanism and the prop cooperate with each other to hold the cam face in a predetermined relationship with the second cam lobe.

REFERENCES:
patent: 4151817 (1979-05-01), Mueller
patent: 4203397 (1980-05-01), Soeters, Jr.
patent: 4556025 (1985-12-01), Morita
patent: 4612884 (1986-09-01), Ajiki et al.
patent: 4726332 (1988-02-01), Nishimura et al.
patent: 5046462 (1991-09-01), Matayoshi et al.
patent: 5085182 (1992-02-01), Nakamura et al.
patent: 5099806 (1992-03-01), Murata et al.
patent: 5183015 (1993-02-01), Morita et al.

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