Dual valve lift blip with single cam lobe for gasoline engines

Details Dual valve lift blip with single cam lobe for gasoline engines Dual valve lift blip with single cam lobe for gasoline engines

2006-11-22

2009-02-03

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Tappet

C123S090520, C074S569000

Reexamination Certificate

active

07484488

ABSTRACT:
A tappet assembly includes a first follower engaging a cam lobe profile, and a second follower engaging an engine poppet valve. A latch member is operable to fix the first follower in an extended position, to provide a high lift condition. The first and second followers define first and second stop surfaces, respectively, such that when the latch member is retracted, the lift portion engages the first follower and moves it toward the poppet valve until the stop surfaces engage, and thereafter, further downward movement of the first follower moves the second follower to provide a low lift. One benefit of this feature is to prevent accumulation of unburned fuel in a port fuel injection type of gasoline engine.

REFERENCES:
patent: 6076491 (2000-06-01), Allen

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