Engine cylinder valve controlling apparatus

Details Engine cylinder valve controlling apparatus Engine cylinder valve controlling apparatus

1997-02-20

1998-08-18

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9022, F01L 1300

Patent

active

057945764

ABSTRACT:
An cylinder valve controlling apparatus comprises a first rocker arm and a second rocker arm cooperating with a middle lift cam and a low lift cam, respectively, to active two cylinder valves arranged for each of the engine cylinders, respectively. The apparatus further comprises a free rocker arm cooperating with a high lift cam. During engine operation at low speeds, the first rocker arm activates one of the cylinder valves in accordance with the profile of the middle lift cam, while the second rocker arm activates the other cylinder valve in accordance with the profile of the low lift cam. During engine operation at middle speeds, a coupling including a first lever establish drive connection between the first and second rocker arms and thus the first and second rocker arms follow the profile of the middle cam. During engine operation at high speeds, with the first-mentioned coupling maintaining the drive connection, another coupling establishes drive connection between the free cam follower and the first rocker arm. Thus, the first and second rocker arms activate the corresponding cylinder valves in accordance with the profile of the high lift cam.

REFERENCES:
patent: 5085182 (1992-02-01), Nakamura et al.
patent: 5143037 (1992-09-01), Sawamoto
patent: 5297516 (1994-03-01), Hara
patent: 5388552 (1995-02-01), Sugimoto et al.
patent: 5529032 (1996-06-01), Oikawa et al.

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